/*
- * Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
- * (Royal Institute of Technology, Stockholm, Sweden).
- * All rights reserved.
+ * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
*
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
*
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
*
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
*
- * 3. Neither the name of the Institute nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
*
- * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
*/
#include "krb5_locl.h"
-RCSID("$Id: crypto.c,v 1.128 2005/07/20 07:22:43 lha Exp $");
-#undef CRYPTO_DEBUG
-#ifdef CRYPTO_DEBUG
-static void krb5_crypto_debug(krb5_context, int, size_t, krb5_keyblock*);
-#endif
-
-
-struct key_data {
- krb5_keyblock *key;
- krb5_data *schedule;
-};
-
-struct key_usage {
+struct _krb5_key_usage {
unsigned usage;
- struct key_data key;
-};
-
-struct krb5_crypto_data {
- struct encryption_type *et;
- struct key_data key;
- int num_key_usage;
- struct key_usage *key_usage;
- void *params;
+ struct _krb5_key_data key;
};
-#define kcrypto_oid_enc(n) { sizeof(n)/sizeof(n[0]), n }
-
-#define CRYPTO_ETYPE(C) ((C)->et->type)
-
-/* bits for `flags' below */
-#define F_KEYED 1 /* checksum is keyed */
-#define F_CPROOF 2 /* checksum is collision proof */
-#define F_DERIVED 4 /* uses derived keys */
-#define F_VARIANT 8 /* uses `variant' keys (6.4.3) */
-#define F_PSEUDO 16 /* not a real protocol type */
-#define F_SPECIAL 32 /* backwards */
-#define F_DISABLED 64 /* enctype/checksum disabled */
-#define F_PADCMS 128 /* padding done like in CMS */
-
-struct salt_type {
- krb5_salttype type;
- const char *name;
- krb5_error_code (*string_to_key)(krb5_context, krb5_enctype, krb5_data,
- krb5_salt, krb5_data, krb5_keyblock*);
-};
-struct key_type {
- krb5_keytype type; /* XXX */
- const char *name;
- size_t bits;
- size_t size;
- size_t minsize;
- size_t schedule_size;
-#if 0
- krb5_enctype best_etype;
+#ifndef HEIMDAL_SMALLER
+#define DES3_OLD_ENCTYPE 1
#endif
- void (*random_key)(krb5_context, krb5_keyblock*);
- void (*schedule)(krb5_context, struct key_data *, const void *);
- struct salt_type *string_to_key;
- void (*random_to_key)(krb5_context, krb5_keyblock*, const void*, size_t);
- krb5_error_code (*get_params)(krb5_context, const krb5_data *,
- void **, krb5_data *);
- krb5_error_code (*set_params)(krb5_context, const void *,
- const krb5_data *, krb5_data *);
-};
-
-struct checksum_type {
- krb5_cksumtype type;
- const char *name;
- size_t blocksize;
- size_t checksumsize;
- unsigned flags;
- void (*checksum)(krb5_context context,
- struct key_data *key,
- const void *buf, size_t len,
- unsigned usage,
- Checksum *csum);
- krb5_error_code (*verify)(krb5_context context,
- struct key_data *key,
- const void *buf, size_t len,
- unsigned usage,
- Checksum *csum);
-};
-struct encryption_type {
- krb5_enctype type;
- const char *name;
- heim_oid *oid;
- size_t blocksize;
- size_t padsize;
- size_t confoundersize;
- struct key_type *keytype;
- struct checksum_type *checksum;
- struct checksum_type *keyed_checksum;
- unsigned flags;
- krb5_error_code (*encrypt)(krb5_context context,
- struct key_data *key,
- void *data, size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ivec);
-};
+static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
+ unsigned, struct _krb5_key_data**);
+static struct _krb5_key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
-#define ENCRYPTION_USAGE(U) (((U) << 8) | 0xAA)
-#define INTEGRITY_USAGE(U) (((U) << 8) | 0x55)
-#define CHECKSUM_USAGE(U) (((U) << 8) | 0x99)
-
-static struct checksum_type *_find_checksum(krb5_cksumtype type);
-static struct encryption_type *_find_enctype(krb5_enctype type);
-static struct key_type *_find_keytype(krb5_keytype type);
-static krb5_error_code _get_derived_key(krb5_context, krb5_crypto,
- unsigned, struct key_data**);
-static struct key_data *_new_derived_key(krb5_crypto crypto, unsigned usage);
-static krb5_error_code derive_key(krb5_context context,
- struct encryption_type *et,
- struct key_data *key,
- const void *constant,
- size_t len);
-static krb5_error_code hmac(krb5_context context,
- struct checksum_type *cm,
- const void *data,
- size_t len,
- unsigned usage,
- struct key_data *keyblock,
- Checksum *result);
-static void free_key_data(krb5_context context, struct key_data *key);
-static krb5_error_code usage2arcfour (krb5_context, unsigned *);
-static void xor (DES_cblock *, const unsigned char *);
+static void free_key_schedule(krb5_context,
+ struct _krb5_key_data *,
+ struct _krb5_encryption_type *);
/************************************************************
* *
************************************************************/
-static HEIMDAL_MUTEX crypto_mutex = HEIMDAL_MUTEX_INITIALIZER;
-
-
-static void
-krb5_DES_random_key(krb5_context context,
- krb5_keyblock *key)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_keysize(krb5_context context,
+ krb5_enctype type,
+ size_t *keysize)
{
- DES_cblock *k = key->keyvalue.data;
- do {
- krb5_generate_random_block(k, sizeof(DES_cblock));
- DES_set_odd_parity(k);
- } while(DES_is_weak_key(k));
+ struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+ if(et == NULL) {
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ type);
+ return KRB5_PROG_ETYPE_NOSUPP;
+ }
+ *keysize = et->keytype->size;
+ return 0;
}
-static void
-krb5_DES_schedule(krb5_context context,
- struct key_data *key,
- const void *params)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_keybits(krb5_context context,
+ krb5_enctype type,
+ size_t *keybits)
{
- DES_set_key(key->key->keyvalue.data, key->schedule->data);
+ struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+ if(et == NULL) {
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ "encryption type %d not supported",
+ type);
+ return KRB5_PROG_ETYPE_NOSUPP;
+ }
+ *keybits = et->keytype->bits;
+ return 0;
}
-static void
-DES_string_to_key_int(unsigned char *data, size_t length, DES_cblock *key)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_generate_random_keyblock(krb5_context context,
+ krb5_enctype type,
+ krb5_keyblock *key)
{
- DES_key_schedule schedule;
- int i;
- int reverse = 0;
- unsigned char *p;
-
- unsigned char swap[] = { 0x0, 0x8, 0x4, 0xc, 0x2, 0xa, 0x6, 0xe,
- 0x1, 0x9, 0x5, 0xd, 0x3, 0xb, 0x7, 0xf };
- memset(key, 0, 8);
-
- p = (unsigned char*)key;
- for (i = 0; i < length; i++) {
- unsigned char tmp = data[i];
- if (!reverse)
- *p++ ^= (tmp << 1);
- else
- *--p ^= (swap[tmp & 0xf] << 4) | swap[(tmp & 0xf0) >> 4];
- if((i % 8) == 7)
- reverse = !reverse;
+ krb5_error_code ret;
+ struct _krb5_encryption_type *et = _krb5_find_enctype(type);
+ if(et == NULL) {
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ type);
+ return KRB5_PROG_ETYPE_NOSUPP;
}
- DES_set_odd_parity(key);
- if(DES_is_weak_key(key))
- (*key)[7] ^= 0xF0;
- DES_set_key(key, &schedule);
- DES_cbc_cksum((void*)data, key, length, &schedule, key);
- memset(&schedule, 0, sizeof(schedule));
- DES_set_odd_parity(key);
- if(DES_is_weak_key(key))
- (*key)[7] ^= 0xF0;
+ ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
+ if(ret)
+ return ret;
+ key->keytype = type;
+ if(et->keytype->random_key)
+ (*et->keytype->random_key)(context, key);
+ else
+ krb5_generate_random_block(key->keyvalue.data,
+ key->keyvalue.length);
+ return 0;
}
static krb5_error_code
-krb5_DES_string_to_key(krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
+_key_schedule(krb5_context context,
+ struct _krb5_key_data *key)
{
- unsigned char *s;
- size_t len;
- DES_cblock tmp;
+ krb5_error_code ret;
+ struct _krb5_encryption_type *et = _krb5_find_enctype(key->key->keytype);
+ struct _krb5_key_type *kt;
- len = password.length + salt.saltvalue.length;
- s = malloc(len);
- if(len > 0 && s == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ if (et == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ key->key->keytype);
+ return KRB5_PROG_ETYPE_NOSUPP;
+ }
+
+ kt = et->keytype;
+
+ if(kt->schedule == NULL)
+ return 0;
+ if (key->schedule != NULL)
+ return 0;
+ ALLOC(key->schedule, 1);
+ if(key->schedule == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
- memcpy(s, password.data, password.length);
- memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
- DES_string_to_key_int(s, len, &tmp);
- key->keytype = enctype;
- krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
- memset(&tmp, 0, sizeof(tmp));
- memset(s, 0, len);
- free(s);
+ ret = krb5_data_alloc(key->schedule, kt->schedule_size);
+ if(ret) {
+ free(key->schedule);
+ key->schedule = NULL;
+ return ret;
+ }
+ (*kt->schedule)(context, kt, key);
return 0;
}
-#ifdef ENABLE_AFS_STRING_TO_KEY
+/************************************************************
+ * *
+ ************************************************************/
-/* This defines the Andrew string_to_key function. It accepts a password
- * string as input and converts its via a one-way encryption algorithm to a DES
- * encryption key. It is compatible with the original Andrew authentication
- * service password database.
- */
+static krb5_error_code
+SHA1_checksum(krb5_context context,
+ struct _krb5_key_data *key,
+ const void *data,
+ size_t len,
+ unsigned usage,
+ Checksum *C)
+{
+ if (EVP_Digest(data, len, C->checksum.data, NULL, EVP_sha1(), NULL) != 1)
+ krb5_abortx(context, "sha1 checksum failed");
+ return 0;
+}
-/*
- * Short passwords, i.e 8 characters or less.
- */
-static void
-krb5_DES_AFS3_CMU_string_to_key (krb5_data pw,
- krb5_data cell,
- DES_cblock *key)
+/* HMAC according to RFC2104 */
+krb5_error_code
+_krb5_internal_hmac(krb5_context context,
+ struct _krb5_checksum_type *cm,
+ const void *data,
+ size_t len,
+ unsigned usage,
+ struct _krb5_key_data *keyblock,
+ Checksum *result)
{
- char password[8+1]; /* crypt is limited to 8 chars anyway */
- int i;
-
- for(i = 0; i < 8; i++) {
- char c = ((i < pw.length) ? ((char*)pw.data)[i] : 0) ^
- ((i < cell.length) ?
- tolower(((unsigned char*)cell.data)[i]) : 0);
- password[i] = c ? c : 'X';
+ unsigned char *ipad, *opad;
+ unsigned char *key;
+ size_t key_len;
+ size_t i;
+
+ ipad = malloc(cm->blocksize + len);
+ if (ipad == NULL)
+ return ENOMEM;
+ opad = malloc(cm->blocksize + cm->checksumsize);
+ if (opad == NULL) {
+ free(ipad);
+ return ENOMEM;
}
- password[8] = '\0';
+ memset(ipad, 0x36, cm->blocksize);
+ memset(opad, 0x5c, cm->blocksize);
- memcpy(key, crypt(password, "p1") + 2, sizeof(DES_cblock));
+ if(keyblock->key->keyvalue.length > cm->blocksize){
+ (*cm->checksum)(context,
+ keyblock,
+ keyblock->key->keyvalue.data,
+ keyblock->key->keyvalue.length,
+ usage,
+ result);
+ key = result->checksum.data;
+ key_len = result->checksum.length;
+ } else {
+ key = keyblock->key->keyvalue.data;
+ key_len = keyblock->key->keyvalue.length;
+ }
+ for(i = 0; i < key_len; i++){
+ ipad[i] ^= key[i];
+ opad[i] ^= key[i];
+ }
+ memcpy(ipad + cm->blocksize, data, len);
+ (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
+ usage, result);
+ memcpy(opad + cm->blocksize, result->checksum.data,
+ result->checksum.length);
+ (*cm->checksum)(context, keyblock, opad,
+ cm->blocksize + cm->checksumsize, usage, result);
+ memset(ipad, 0, cm->blocksize + len);
+ free(ipad);
+ memset(opad, 0, cm->blocksize + cm->checksumsize);
+ free(opad);
- /* parity is inserted into the LSB so left shift each byte up one
- bit. This allows ascii characters with a zero MSB to retain as
- much significance as possible. */
- for (i = 0; i < sizeof(DES_cblock); i++)
- ((unsigned char*)key)[i] <<= 1;
- DES_set_odd_parity (key);
+ return 0;
}
-/*
- * Long passwords, i.e 9 characters or more.
- */
-static void
-krb5_DES_AFS3_Transarc_string_to_key (krb5_data pw,
- krb5_data cell,
- DES_cblock *key)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_hmac(krb5_context context,
+ krb5_cksumtype cktype,
+ const void *data,
+ size_t len,
+ unsigned usage,
+ krb5_keyblock *key,
+ Checksum *result)
{
- DES_key_schedule schedule;
- DES_cblock temp_key;
- DES_cblock ivec;
- char password[512];
- size_t passlen;
-
- memcpy(password, pw.data, min(pw.length, sizeof(password)));
- if(pw.length < sizeof(password)) {
- int len = min(cell.length, sizeof(password) - pw.length);
- int i;
-
- memcpy(password + pw.length, cell.data, len);
- for (i = pw.length; i < pw.length + len; ++i)
- password[i] = tolower((unsigned char)password[i]);
+ struct _krb5_checksum_type *c = _krb5_find_checksum(cktype);
+ struct _krb5_key_data kd;
+ krb5_error_code ret;
+
+ if (c == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ cktype);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
- passlen = min(sizeof(password), pw.length + cell.length);
- memcpy(&ivec, "kerberos", 8);
- memcpy(&temp_key, "kerberos", 8);
- DES_set_odd_parity (&temp_key);
- DES_set_key (&temp_key, &schedule);
- DES_cbc_cksum ((void*)password, &ivec, passlen, &schedule, &ivec);
-
- memcpy(&temp_key, &ivec, 8);
- DES_set_odd_parity (&temp_key);
- DES_set_key (&temp_key, &schedule);
- DES_cbc_cksum ((void*)password, key, passlen, &schedule, &ivec);
- memset(&schedule, 0, sizeof(schedule));
- memset(&temp_key, 0, sizeof(temp_key));
- memset(&ivec, 0, sizeof(ivec));
- memset(password, 0, sizeof(password));
-
- DES_set_odd_parity (key);
-}
-static krb5_error_code
-DES_AFS3_string_to_key(krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
-{
- DES_cblock tmp;
- if(password.length > 8)
- krb5_DES_AFS3_Transarc_string_to_key(password, salt.saltvalue, &tmp);
- else
- krb5_DES_AFS3_CMU_string_to_key(password, salt.saltvalue, &tmp);
- key->keytype = enctype;
- krb5_data_copy(&key->keyvalue, tmp, sizeof(tmp));
- memset(&key, 0, sizeof(key));
- return 0;
-}
-#endif /* ENABLE_AFS_STRING_TO_KEY */
+ kd.key = key;
+ kd.schedule = NULL;
-static void
-krb5_DES_random_to_key(krb5_context context,
- krb5_keyblock *key,
- const void *data,
- size_t size)
-{
- DES_cblock *k = key->keyvalue.data;
- memcpy(k, data, key->keyvalue.length);
- DES_set_odd_parity(k);
- if(DES_is_weak_key(k))
- xor(k, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
-}
+ ret = _krb5_internal_hmac(context, c, data, len, usage, &kd, result);
-/*
- *
- */
+ if (kd.schedule)
+ krb5_free_data(context, kd.schedule);
-static void
-DES3_random_key(krb5_context context,
- krb5_keyblock *key)
-{
- DES_cblock *k = key->keyvalue.data;
- do {
- krb5_generate_random_block(k, 3 * sizeof(DES_cblock));
- DES_set_odd_parity(&k[0]);
- DES_set_odd_parity(&k[1]);
- DES_set_odd_parity(&k[2]);
- } while(DES_is_weak_key(&k[0]) ||
- DES_is_weak_key(&k[1]) ||
- DES_is_weak_key(&k[2]));
+ return ret;
}
-static void
-DES3_schedule(krb5_context context,
- struct key_data *key,
- const void *params)
+krb5_error_code
+_krb5_SP_HMAC_SHA1_checksum(krb5_context context,
+ struct _krb5_key_data *key,
+ const void *data,
+ size_t len,
+ unsigned usage,
+ Checksum *result)
{
- DES_cblock *k = key->key->keyvalue.data;
- DES_key_schedule *s = key->schedule->data;
- DES_set_key(&k[0], &s[0]);
- DES_set_key(&k[1], &s[1]);
- DES_set_key(&k[2], &s[2]);
+ struct _krb5_checksum_type *c = _krb5_find_checksum(CKSUMTYPE_SHA1);
+ Checksum res;
+ char sha1_data[20];
+ krb5_error_code ret;
+
+ res.checksum.data = sha1_data;
+ res.checksum.length = sizeof(sha1_data);
+
+ ret = _krb5_internal_hmac(context, c, data, len, usage, key, &res);
+ if (ret)
+ krb5_abortx(context, "hmac failed");
+ memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
+ return 0;
}
-/*
- * A = A xor B. A & B are 8 bytes.
- */
+struct _krb5_checksum_type _krb5_checksum_sha1 = {
+ CKSUMTYPE_SHA1,
+ "sha1",
+ 64,
+ 20,
+ F_CPROOF,
+ SHA1_checksum,
+ NULL
+};
-static void
-xor (DES_cblock *key, const unsigned char *b)
+struct _krb5_checksum_type *
+_krb5_find_checksum(krb5_cksumtype type)
{
- unsigned char *a = (unsigned char*)key;
- a[0] ^= b[0];
- a[1] ^= b[1];
- a[2] ^= b[2];
- a[3] ^= b[3];
- a[4] ^= b[4];
- a[5] ^= b[5];
- a[6] ^= b[6];
- a[7] ^= b[7];
+ int i;
+ for(i = 0; i < _krb5_num_checksums; i++)
+ if(_krb5_checksum_types[i]->type == type)
+ return _krb5_checksum_types[i];
+ return NULL;
}
static krb5_error_code
-DES3_string_to_key(krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
+get_checksum_key(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage, /* not krb5_key_usage */
+ struct _krb5_checksum_type *ct,
+ struct _krb5_key_data **key)
{
- char *str;
- size_t len;
- unsigned char tmp[24];
- DES_cblock keys[3];
-
- len = password.length + salt.saltvalue.length;
- str = malloc(len);
- if(len != 0 && str == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
- }
- memcpy(str, password.data, password.length);
- memcpy(str + password.length, salt.saltvalue.data, salt.saltvalue.length);
- {
- DES_cblock ivec;
- DES_key_schedule s[3];
- int i;
-
- _krb5_n_fold(str, len, tmp, 24);
-
- for(i = 0; i < 3; i++){
- memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
- DES_set_odd_parity(keys + i);
- if(DES_is_weak_key(keys + i))
- xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
- DES_set_key(keys + i, &s[i]);
- }
- memset(&ivec, 0, sizeof(ivec));
- DES_ede3_cbc_encrypt(tmp,
- tmp, sizeof(tmp),
- &s[0], &s[1], &s[2], &ivec, DES_ENCRYPT);
- memset(s, 0, sizeof(s));
- memset(&ivec, 0, sizeof(ivec));
- for(i = 0; i < 3; i++){
- memcpy(keys + i, tmp + i * 8, sizeof(keys[i]));
- DES_set_odd_parity(keys + i);
- if(DES_is_weak_key(keys + i))
- xor(keys + i, (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
+ krb5_error_code ret = 0;
+
+ if(ct->flags & F_DERIVED)
+ ret = _get_derived_key(context, crypto, usage, key);
+ else if(ct->flags & F_VARIANT) {
+ size_t i;
+
+ *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
+ if(*key == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
}
- memset(tmp, 0, sizeof(tmp));
+ ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
+ if(ret)
+ return ret;
+ for(i = 0; i < (*key)->key->keyvalue.length; i++)
+ ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
+ } else {
+ *key = &crypto->key;
}
- key->keytype = enctype;
- krb5_data_copy(&key->keyvalue, keys, sizeof(keys));
- memset(keys, 0, sizeof(keys));
- memset(str, 0, len);
- free(str);
- return 0;
+ if(ret == 0)
+ ret = _key_schedule(context, *key);
+ return ret;
}
static krb5_error_code
-DES3_string_to_key_derived(krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
+create_checksum (krb5_context context,
+ struct _krb5_checksum_type *ct,
+ krb5_crypto crypto,
+ unsigned usage,
+ void *data,
+ size_t len,
+ Checksum *result)
{
krb5_error_code ret;
- size_t len = password.length + salt.saltvalue.length;
- char *s;
+ struct _krb5_key_data *dkey;
+ int keyed_checksum;
- s = malloc(len);
- if(len != 0 && s == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ if (ct->flags & F_DISABLED) {
+ krb5_clear_error_message (context);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
- memcpy(s, password.data, password.length);
- memcpy(s + password.length, salt.saltvalue.data, salt.saltvalue.length);
- ret = krb5_string_to_key_derived(context,
- s,
- len,
- enctype,
- key);
- memset(s, 0, len);
- free(s);
- return ret;
-}
-
-static void
-DES3_random_to_key(krb5_context context,
- krb5_keyblock *key,
- const void *data,
- size_t size)
-{
- unsigned char *x = key->keyvalue.data;
- const u_char *q = data;
- DES_cblock *k;
- int i, j;
-
- memset(x, 0, sizeof(x));
- for (i = 0; i < 3; ++i) {
- unsigned char foo;
- for (j = 0; j < 7; ++j) {
- unsigned char b = q[7 * i + j];
-
- x[8 * i + j] = b;
- }
- foo = 0;
- for (j = 6; j >= 0; --j) {
- foo |= q[7 * i + j] & 1;
- foo <<= 1;
- }
- x[8 * i + 7] = foo;
+ keyed_checksum = (ct->flags & F_KEYED) != 0;
+ if(keyed_checksum && crypto == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("Checksum type %s is keyed but no "
+ "crypto context (key) was passed in", ""),
+ ct->name);
+ return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
}
- k = key->keyvalue.data;
- for (i = 0; i < 3; i++) {
- DES_set_odd_parity(&k[i]);
- if(DES_is_weak_key(&k[i]))
- xor(&k[i], (const unsigned char*)"\0\0\0\0\0\0\0\xf0");
- }
+ if(keyed_checksum) {
+ ret = get_checksum_key(context, crypto, usage, ct, &dkey);
+ if (ret)
+ return ret;
+ } else
+ dkey = NULL;
+ result->cksumtype = ct->type;
+ ret = krb5_data_alloc(&result->checksum, ct->checksumsize);
+ if (ret)
+ return (ret);
+ return (*ct->checksum)(context, dkey, data, len, usage, result);
}
-/*
- * ARCFOUR
- */
-
-static void
-ARCFOUR_schedule(krb5_context context,
- struct key_data *kd,
- const void *params)
+static int
+arcfour_checksum_p(struct _krb5_checksum_type *ct, krb5_crypto crypto)
{
- RC4_set_key (kd->schedule->data,
- kd->key->keyvalue.length, kd->key->keyvalue.data);
+ return (ct->type == CKSUMTYPE_HMAC_MD5) &&
+ (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
}
-static krb5_error_code
-ARCFOUR_string_to_key(krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
-{
- char *s, *p;
- size_t len;
- int i;
- MD4_CTX m;
-
- len = 2 * password.length;
- s = malloc (len);
- if (len != 0 && s == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_create_checksum(krb5_context context,
+ krb5_crypto crypto,
+ krb5_key_usage usage,
+ int type,
+ void *data,
+ size_t len,
+ Checksum *result)
+{
+ struct _krb5_checksum_type *ct = NULL;
+ unsigned keyusage;
+
+ /* type 0 -> pick from crypto */
+ if (type) {
+ ct = _krb5_find_checksum(type);
+ } else if (crypto) {
+ ct = crypto->et->keyed_checksum;
+ if (ct == NULL)
+ ct = crypto->et->checksum;
}
- for (p = s, i = 0; i < password.length; ++i) {
- *p++ = ((char *)password.data)[i];
- *p++ = 0;
+
+ if(ct == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ type);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
- MD4_Init (&m);
- MD4_Update (&m, s, len);
- key->keytype = enctype;
- krb5_data_alloc (&key->keyvalue, 16);
- MD4_Final (key->keyvalue.data, &m);
- memset (s, 0, len);
- free (s);
- return 0;
-}
-/*
- * AES
- */
+ if (arcfour_checksum_p(ct, crypto)) {
+ keyusage = usage;
+ _krb5_usage2arcfour(context, &keyusage);
+ } else
+ keyusage = CHECKSUM_USAGE(usage);
-/* iter is really 1 based, so iter == 0 will be 1 iteration */
+ return create_checksum(context, ct, crypto, keyusage,
+ data, len, result);
+}
-krb5_error_code KRB5_LIB_FUNCTION
-_krb5_PKCS5_PBKDF2(krb5_context context, krb5_cksumtype cktype,
- krb5_data password, krb5_salt salt, u_int32_t iter,
- krb5_keytype type, krb5_keyblock *key)
+static krb5_error_code
+verify_checksum(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage, /* not krb5_key_usage */
+ void *data,
+ size_t len,
+ Checksum *cksum)
{
- struct checksum_type *c = _find_checksum(cktype);
- struct key_type *kt;
- size_t datalen, leftofkey;
krb5_error_code ret;
- u_int32_t keypart;
- struct key_data ksign;
- krb5_keyblock kb;
- Checksum result;
- char *data, *tmpcksum;
- int i, j;
- char *p;
-
- if (c == NULL) {
- krb5_set_error_string(context, "checksum %d not supported", cktype);
- return KRB5_PROG_KEYTYPE_NOSUPP;
+ struct _krb5_key_data *dkey;
+ int keyed_checksum;
+ Checksum c;
+ struct _krb5_checksum_type *ct;
+
+ ct = _krb5_find_checksum(cksum->cksumtype);
+ if (ct == NULL || (ct->flags & F_DISABLED)) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ cksum->cksumtype);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
+ if(ct->checksumsize != cksum->checksum.length) {
+ krb5_clear_error_message (context);
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_BAD_INTEGRITY,
+ N_("Decrypt integrity check failed for checksum type %s, "
+ "length was %u, expected %u", ""),
+ ct->name, (unsigned)cksum->checksum.length,
+ (unsigned)ct->checksumsize);
- kt = _find_keytype(type);
- if (kt == NULL) {
- krb5_set_error_string(context, "key type %d not supported", type);
- return KRB5_PROG_KEYTYPE_NOSUPP;
+ return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
}
-
- key->keytype = type;
- ret = krb5_data_alloc (&key->keyvalue, kt->bits / 8);
- if (ret) {
- krb5_set_error_string(context, "malloc: out of memory");
+ keyed_checksum = (ct->flags & F_KEYED) != 0;
+ if(keyed_checksum) {
+ struct _krb5_checksum_type *kct;
+ if (crypto == NULL) {
+ krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("Checksum type %s is keyed but no "
+ "crypto context (key) was passed in", ""),
+ ct->name);
+ return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
+ }
+ kct = crypto->et->keyed_checksum;
+ if (kct == NULL || kct->type != ct->type) {
+ krb5_set_error_message(context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("Checksum type %s is keyed, but "
+ "the key type %s passed didnt have that checksum "
+ "type as the keyed type", ""),
+ ct->name, crypto->et->name);
+ return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
+ }
+
+ ret = get_checksum_key(context, crypto, usage, ct, &dkey);
+ if (ret)
+ return ret;
+ } else
+ dkey = NULL;
+
+ /*
+ * If checksum have a verify function, lets use that instead of
+ * calling ->checksum and then compare result.
+ */
+
+ if(ct->verify) {
+ ret = (*ct->verify)(context, dkey, data, len, usage, cksum);
+ if (ret)
+ krb5_set_error_message(context, ret,
+ N_("Decrypt integrity check failed for checksum "
+ "type %s, key type %s", ""),
+ ct->name, (crypto != NULL)? crypto->et->name : "(none)");
return ret;
}
-
- ret = krb5_data_alloc (&result.checksum, c->checksumsize);
- if (ret) {
- krb5_set_error_string(context, "malloc: out of memory");
- krb5_data_free (&key->keyvalue);
+
+ ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
+ if (ret)
return ret;
- }
- tmpcksum = malloc(c->checksumsize);
- if (tmpcksum == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- krb5_data_free (&key->keyvalue);
- krb5_data_free (&result.checksum);
- return ENOMEM;
+ ret = (*ct->checksum)(context, dkey, data, len, usage, &c);
+ if (ret) {
+ krb5_data_free(&c.checksum);
+ return ret;
}
- datalen = salt.saltvalue.length + 4;
- data = malloc(datalen);
- if (data == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- free(tmpcksum);
- krb5_data_free (&key->keyvalue);
- krb5_data_free (&result.checksum);
- return ENOMEM;
+ if(krb5_data_ct_cmp(&c.checksum, &cksum->checksum) != 0) {
+ ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
+ krb5_set_error_message(context, ret,
+ N_("Decrypt integrity check failed for checksum "
+ "type %s, key type %s", ""),
+ ct->name, crypto ? crypto->et->name : "(unkeyed)");
+ } else {
+ ret = 0;
}
+ krb5_data_free (&c.checksum);
+ return ret;
+}
- kb.keyvalue = password;
- ksign.key = &kb;
-
- memcpy(data, salt.saltvalue.data, salt.saltvalue.length);
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_verify_checksum(krb5_context context,
+ krb5_crypto crypto,
+ krb5_key_usage usage,
+ void *data,
+ size_t len,
+ Checksum *cksum)
+{
+ struct _krb5_checksum_type *ct;
+ unsigned keyusage;
- keypart = 1;
- leftofkey = key->keyvalue.length;
- p = key->keyvalue.data;
+ ct = _krb5_find_checksum(cksum->cksumtype);
+ if(ct == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ cksum->cksumtype);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
+ }
- while (leftofkey) {
- int len;
+ if (arcfour_checksum_p(ct, crypto)) {
+ keyusage = usage;
+ _krb5_usage2arcfour(context, &keyusage);
+ } else
+ keyusage = CHECKSUM_USAGE(usage);
- if (leftofkey > c->checksumsize)
- len = c->checksumsize;
- else
- len = leftofkey;
+ return verify_checksum(context, crypto, keyusage,
+ data, len, cksum);
+}
- _krb5_put_int(data + datalen - 4, keypart, 4);
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_get_checksum_type(krb5_context context,
+ krb5_crypto crypto,
+ krb5_cksumtype *type)
+{
+ struct _krb5_checksum_type *ct = NULL;
- ret = hmac(context, c, data, datalen, 0, &ksign, &result);
- if (ret)
- krb5_abortx(context, "hmac failed");
- memcpy(p, result.checksum.data, len);
- memcpy(tmpcksum, result.checksum.data, result.checksum.length);
- for (i = 0; i < iter; i++) {
- ret = hmac(context, c, tmpcksum, result.checksum.length,
- 0, &ksign, &result);
- if (ret)
- krb5_abortx(context, "hmac failed");
- memcpy(tmpcksum, result.checksum.data, result.checksum.length);
- for (j = 0; j < len; j++)
- p[j] ^= tmpcksum[j];
- }
+ if (crypto != NULL) {
+ ct = crypto->et->keyed_checksum;
+ if (ct == NULL)
+ ct = crypto->et->checksum;
+ }
- p += len;
- leftofkey -= len;
- keypart++;
+ if (ct == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type not found", ""));
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
- free(data);
- free(tmpcksum);
- krb5_data_free (&result.checksum);
+ *type = ct->type;
return 0;
}
-int _krb5_AES_string_to_default_iterator = 4096;
-static krb5_error_code
-AES_string_to_key(krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_checksumsize(krb5_context context,
+ krb5_cksumtype type,
+ size_t *size)
{
- krb5_error_code ret;
- u_int32_t iter;
- struct encryption_type *et;
- struct key_data kd;
-
- if (opaque.length == 0)
- iter = _krb5_AES_string_to_default_iterator - 1;
- else if (opaque.length == 4) {
- unsigned long v;
- _krb5_get_int(opaque.data, &v, 4);
- iter = ((u_int32_t)v) - 1;
- } else
- return KRB5_PROG_KEYTYPE_NOSUPP; /* XXX */
-
-
- et = _find_enctype(enctype);
- if (et == NULL)
- return KRB5_PROG_KEYTYPE_NOSUPP;
-
- ret = _krb5_PKCS5_PBKDF2(context, CKSUMTYPE_SHA1, password, salt,
- iter, enctype, key);
- if (ret)
- return ret;
+ struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+ if(ct == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ type);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
+ }
+ *size = ct->checksumsize;
+ return 0;
+}
- ret = krb5_copy_keyblock(context, key, &kd.key);
- kd.schedule = NULL;
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_checksum_is_keyed(krb5_context context,
+ krb5_cksumtype type)
+{
+ struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+ if(ct == NULL) {
+ if (context)
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ type);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
+ }
+ return ct->flags & F_KEYED;
+}
- ret = derive_key(context, et, &kd, "kerberos", strlen("kerberos"));
- krb5_free_keyblock_contents(context, key);
- if (ret == 0) {
- ret = krb5_copy_keyblock_contents(context, kd.key, key);
- free_key_data(context, &kd);
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_checksum_is_collision_proof(krb5_context context,
+ krb5_cksumtype type)
+{
+ struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+ if(ct == NULL) {
+ if (context)
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ type);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
+ return ct->flags & F_CPROOF;
+}
- return ret;
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_checksum_disable(krb5_context context,
+ krb5_cksumtype type)
+{
+ struct _krb5_checksum_type *ct = _krb5_find_checksum(type);
+ if(ct == NULL) {
+ if (context)
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ type);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
+ }
+ ct->flags |= F_DISABLED;
+ return 0;
}
-struct krb5_aes_schedule {
- AES_KEY ekey;
- AES_KEY dkey;
-};
+/************************************************************
+ * *
+ ************************************************************/
-static void
-AES_schedule(krb5_context context,
- struct key_data *kd,
- const void *params)
+struct _krb5_encryption_type *
+_krb5_find_enctype(krb5_enctype type)
{
- struct krb5_aes_schedule *key = kd->schedule->data;
- int bits = kd->key->keyvalue.length * 8;
-
- memset(key, 0, sizeof(*key));
- AES_set_encrypt_key(kd->key->keyvalue.data, bits, &key->ekey);
- AES_set_decrypt_key(kd->key->keyvalue.data, bits, &key->dkey);
+ int i;
+ for(i = 0; i < _krb5_num_etypes; i++)
+ if(_krb5_etypes[i]->type == type)
+ return _krb5_etypes[i];
+ return NULL;
}
-/*
- * RC2
- */
-
-struct _RC2_params {
- int maximum_effective_key;
-};
-static krb5_error_code
-rc2_get_params(krb5_context context,
- const krb5_data *data,
- void **params,
- krb5_data *ivec)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_to_string(krb5_context context,
+ krb5_enctype etype,
+ char **string)
{
- RC2CBCParameter rc2params;
- struct _RC2_params *p;
- krb5_error_code ret;
- size_t size;
-
- ret = decode_RC2CBCParameter(data->data, data->length, &rc2params, &size);
- if (ret) {
- krb5_set_error_string(context, "Can't decode RC2 parameters");
- return ret;
+ struct _krb5_encryption_type *e;
+ e = _krb5_find_enctype(etype);
+ if(e == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ etype);
+ *string = NULL;
+ return KRB5_PROG_ETYPE_NOSUPP;
}
- p = malloc(sizeof(*p));
- if (p == NULL) {
- free_RC2CBCParameter(&rc2params);
- krb5_set_error_string(context, "malloc - out of memory");
+ *string = strdup(e->name);
+ if(*string == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
- /* XXX */
- switch(rc2params.rc2ParameterVersion) {
- case 160:
- p->maximum_effective_key = 40;
- break;
- case 120:
- p->maximum_effective_key = 64;
- break;
- case 58:
- p->maximum_effective_key = 128;
- break;
-
- }
- if (ivec)
- ret = copy_octet_string(&rc2params.iv, ivec);
- free_RC2CBCParameter(&rc2params);
- *params = p;
-
- return ret;
+ return 0;
}
-static krb5_error_code
-rc2_set_params(krb5_context context,
- const void *params,
- const krb5_data *ivec,
- krb5_data *data)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_string_to_enctype(krb5_context context,
+ const char *string,
+ krb5_enctype *etype)
{
- RC2CBCParameter rc2params;
- const struct _RC2_params *p = params;
- int maximum_effective_key = 128;
- krb5_error_code ret;
- size_t size;
-
- memset(&rc2params, 0, sizeof(rc2params));
-
- if (p)
- maximum_effective_key = p->maximum_effective_key;
+ int i;
+ for(i = 0; i < _krb5_num_etypes; i++)
+ if(strcasecmp(_krb5_etypes[i]->name, string) == 0){
+ *etype = _krb5_etypes[i]->type;
+ return 0;
+ }
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %s not supported", ""),
+ string);
+ return KRB5_PROG_ETYPE_NOSUPP;
+}
- /* XXX */
- switch(maximum_effective_key) {
- case 40:
- rc2params.rc2ParameterVersion = 160;
- break;
- case 64:
- rc2params.rc2ParameterVersion = 120;
- break;
- case 128:
- rc2params.rc2ParameterVersion = 58;
- break;
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_to_keytype(krb5_context context,
+ krb5_enctype etype,
+ krb5_keytype *keytype)
+{
+ struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
+ if(e == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ etype);
+ return KRB5_PROG_ETYPE_NOSUPP;
}
- ret = copy_octet_string(ivec, &rc2params.iv);
- if (ret)
- return ret;
-
- ASN1_MALLOC_ENCODE(RC2CBCParameter, data->data, data->length,
- &rc2params, &size, ret);
- if (ret == 0 && size != data->length)
- krb5_abortx(context, "Internal asn1 encoder failure");
- free_RC2CBCParameter(&rc2params);
-
- return ret;
+ *keytype = e->keytype->type; /* XXX */
+ return 0;
}
-static void
-rc2_schedule(krb5_context context,
- struct key_data *kd,
- const void *params)
+/**
+ * Check if a enctype is valid, return 0 if it is.
+ *
+ * @param context Kerberos context
+ * @param etype enctype to check if its valid or not
+ *
+ * @return Return an error code for an failure or 0 on success (enctype valid).
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_valid(krb5_context context,
+ krb5_enctype etype)
{
- const struct _RC2_params *p = params;
- int maximum_effective_key = 128;
- if (p)
- maximum_effective_key = p->maximum_effective_key;
- RC2_set_key (kd->schedule->data,
- kd->key->keyvalue.length,
- kd->key->keyvalue.data,
- maximum_effective_key);
+ struct _krb5_encryption_type *e = _krb5_find_enctype(etype);
+ if(e && (e->flags & F_DISABLED) == 0)
+ return 0;
+ if (context == NULL)
+ return KRB5_PROG_ETYPE_NOSUPP;
+ if(e == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ etype);
+ return KRB5_PROG_ETYPE_NOSUPP;
+ }
+ /* Must be (e->flags & F_DISABLED) */
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %s is disabled", ""),
+ e->name);
+ return KRB5_PROG_ETYPE_NOSUPP;
}
-
-/*
+/**
+ * Return the coresponding encryption type for a checksum type.
*
+ * @param context Kerberos context
+ * @param ctype The checksum type to get the result enctype for
+ * @param etype The returned encryption, when the matching etype is
+ * not found, etype is set to ETYPE_NULL.
+ *
+ * @return Return an error code for an failure or 0 on success.
+ * @ingroup krb5_crypto
*/
-static struct salt_type des_salt[] = {
- {
- KRB5_PW_SALT,
- "pw-salt",
- krb5_DES_string_to_key
- },
-#ifdef ENABLE_AFS_STRING_TO_KEY
- {
- KRB5_AFS3_SALT,
- "afs3-salt",
- DES_AFS3_string_to_key
- },
-#endif
- { 0 }
-};
-
-static struct salt_type des3_salt[] = {
- {
- KRB5_PW_SALT,
- "pw-salt",
- DES3_string_to_key
- },
- { 0 }
-};
-static struct salt_type des3_salt_derived[] = {
- {
- KRB5_PW_SALT,
- "pw-salt",
- DES3_string_to_key_derived
- },
- { 0 }
-};
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_cksumtype_to_enctype(krb5_context context,
+ krb5_cksumtype ctype,
+ krb5_enctype *etype)
+{
+ int i;
-static struct salt_type AES_salt[] = {
- {
- KRB5_PW_SALT,
- "pw-salt",
- AES_string_to_key
- },
- { 0 }
-};
+ *etype = ETYPE_NULL;
-static struct salt_type arcfour_salt[] = {
- {
- KRB5_PW_SALT,
- "pw-salt",
- ARCFOUR_string_to_key
- },
- { 0 }
-};
+ for(i = 0; i < _krb5_num_etypes; i++) {
+ if(_krb5_etypes[i]->keyed_checksum &&
+ _krb5_etypes[i]->keyed_checksum->type == ctype)
+ {
+ *etype = _krb5_etypes[i]->type;
+ return 0;
+ }
+ }
-/*
- *
- */
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ (int)ctype);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
+}
-static struct key_type keytype_null = {
- KEYTYPE_NULL,
- "null",
- 0,
- 0,
- 0,
- 0,
- NULL,
- NULL,
- NULL
-};
-static struct key_type keytype_des = {
- KEYTYPE_DES,
- "des",
- 56,
- sizeof(DES_cblock),
- sizeof(DES_cblock),
- sizeof(DES_key_schedule),
- krb5_DES_random_key,
- krb5_DES_schedule,
- des_salt,
- krb5_DES_random_to_key
-};
-
-static struct key_type keytype_des3 = {
- KEYTYPE_DES3,
- "des3",
- 168,
- 3 * sizeof(DES_cblock),
- 3 * sizeof(DES_cblock),
- 3 * sizeof(DES_key_schedule),
- DES3_random_key,
- DES3_schedule,
- des3_salt,
- DES3_random_to_key
-};
-
-static struct key_type keytype_des3_derived = {
- KEYTYPE_DES3,
- "des3",
- 168,
- 3 * sizeof(DES_cblock),
- 3 * sizeof(DES_cblock),
- 3 * sizeof(DES_key_schedule),
- DES3_random_key,
- DES3_schedule,
- des3_salt_derived,
- DES3_random_to_key
-};
-
-static struct key_type keytype_aes128 = {
- KEYTYPE_AES128,
- "aes-128",
- 128,
- 16,
- 16,
- sizeof(struct krb5_aes_schedule),
- NULL,
- AES_schedule,
- AES_salt
-};
-
-static struct key_type keytype_aes192 = {
- KEYTYPE_AES192,
- "aes-192",
- 192,
- 24,
- 24,
- sizeof(struct krb5_aes_schedule),
- NULL,
- AES_schedule,
- AES_salt
-};
-
-static struct key_type keytype_aes256 = {
- KEYTYPE_AES256,
- "aes-256",
- 256,
- 32,
- 32,
- sizeof(struct krb5_aes_schedule),
- NULL,
- AES_schedule,
- AES_salt
-};
-
-static struct key_type keytype_arcfour = {
- KEYTYPE_ARCFOUR,
- "arcfour",
- 128,
- 16,
- 16,
- sizeof(RC4_KEY),
- NULL,
- ARCFOUR_schedule,
- arcfour_salt
-};
-
-static struct key_type keytype_rc2 = {
- KEYTYPE_RC2,
- "rc2",
- 128,
- 16,
- 1,
- sizeof(RC2_KEY),
- NULL,
- rc2_schedule,
- NULL, /* XXX salt */
- NULL,
- rc2_get_params,
- rc2_set_params
-};
-
-static struct key_type *keytypes[] = {
- &keytype_null,
- &keytype_des,
- &keytype_des3_derived,
- &keytype_des3,
- &keytype_aes128,
- &keytype_aes192,
- &keytype_aes256,
- &keytype_rc2,
- &keytype_arcfour
-};
-
-static int num_keytypes = sizeof(keytypes) / sizeof(keytypes[0]);
-
-static struct key_type *
-_find_keytype(krb5_keytype type)
-{
- int i;
- for(i = 0; i < num_keytypes; i++)
- if(keytypes[i]->type == type)
- return keytypes[i];
- return NULL;
-}
-
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_salttype_to_string (krb5_context context,
- krb5_enctype etype,
- krb5_salttype stype,
- char **string)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_cksumtype_valid(krb5_context context,
+ krb5_cksumtype ctype)
{
- struct encryption_type *e;
- struct salt_type *st;
-
- e = _find_enctype (etype);
- if (e == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- etype);
- return KRB5_PROG_ETYPE_NOSUPP;
+ struct _krb5_checksum_type *c = _krb5_find_checksum(ctype);
+ if (c == NULL) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %d not supported", ""),
+ ctype);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
- for (st = e->keytype->string_to_key; st && st->type; st++) {
- if (st->type == stype) {
- *string = strdup (st->name);
- if (*string == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
- }
- return 0;
- }
+ if (c->flags & F_DISABLED) {
+ krb5_set_error_message (context, KRB5_PROG_SUMTYPE_NOSUPP,
+ N_("checksum type %s is disabled", ""),
+ c->name);
+ return KRB5_PROG_SUMTYPE_NOSUPP;
}
- krb5_set_error_string(context, "salttype %d not supported", stype);
- return HEIM_ERR_SALTTYPE_NOSUPP;
+ return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_salttype (krb5_context context,
- krb5_enctype etype,
- const char *string,
- krb5_salttype *salttype)
-{
- struct encryption_type *e;
- struct salt_type *st;
-
- e = _find_enctype (etype);
- if (e == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- etype);
- return KRB5_PROG_ETYPE_NOSUPP;
- }
- for (st = e->keytype->string_to_key; st && st->type; st++) {
- if (strcasecmp (st->name, string) == 0) {
- *salttype = st->type;
- return 0;
- }
- }
- krb5_set_error_string(context, "salttype %s not supported", string);
- return HEIM_ERR_SALTTYPE_NOSUPP;
-}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_get_pw_salt(krb5_context context,
- krb5_const_principal principal,
- krb5_salt *salt)
+static krb5_boolean
+derived_crypto(krb5_context context,
+ krb5_crypto crypto)
{
- size_t len;
- int i;
- krb5_error_code ret;
- char *p;
-
- salt->salttype = KRB5_PW_SALT;
- len = strlen(principal->realm);
- for (i = 0; i < principal->name.name_string.len; ++i)
- len += strlen(principal->name.name_string.val[i]);
- ret = krb5_data_alloc (&salt->saltvalue, len);
- if (ret)
- return ret;
- p = salt->saltvalue.data;
- memcpy (p, principal->realm, strlen(principal->realm));
- p += strlen(principal->realm);
- for (i = 0; i < principal->name.name_string.len; ++i) {
- memcpy (p,
- principal->name.name_string.val[i],
- strlen(principal->name.name_string.val[i]));
- p += strlen(principal->name.name_string.val[i]);
- }
- return 0;
+ return (crypto->et->flags & F_DERIVED) != 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_free_salt(krb5_context context,
- krb5_salt salt)
+static krb5_boolean
+special_crypto(krb5_context context,
+ krb5_crypto crypto)
{
- krb5_data_free(&salt.saltvalue);
- return 0;
+ return (crypto->et->flags & F_SPECIAL) != 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_key_data (krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_principal principal,
- krb5_keyblock *key)
+#define CHECKSUMSIZE(C) ((C)->checksumsize)
+#define CHECKSUMTYPE(C) ((C)->type)
+
+static krb5_error_code
+encrypt_internal_derived(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage,
+ const void *data,
+ size_t len,
+ krb5_data *result,
+ void *ivec)
{
+ size_t sz, block_sz, checksum_sz, total_sz;
+ Checksum cksum;
+ unsigned char *p, *q;
krb5_error_code ret;
- krb5_salt salt;
-
- ret = krb5_get_pw_salt(context, principal, &salt);
- if(ret)
- return ret;
- ret = krb5_string_to_key_data_salt(context, enctype, password, salt, key);
- krb5_free_salt(context, salt);
- return ret;
-}
+ struct _krb5_key_data *dkey;
+ const struct _krb5_encryption_type *et = crypto->et;
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_key (krb5_context context,
- krb5_enctype enctype,
- const char *password,
- krb5_principal principal,
- krb5_keyblock *key)
-{
- krb5_data pw;
- pw.data = rk_UNCONST(password);
- pw.length = strlen(password);
- return krb5_string_to_key_data(context, enctype, pw, principal, key);
-}
+ checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_key_data_salt (krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_keyblock *key)
-{
- krb5_data opaque;
- krb5_data_zero(&opaque);
- return krb5_string_to_key_data_salt_opaque(context, enctype, password,
- salt, opaque, key);
-}
+ sz = et->confoundersize + len;
+ block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
+ total_sz = block_sz + checksum_sz;
+ p = calloc(1, total_sz);
+ if(p == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
+ }
-/*
- * Do a string -> key for encryption type `enctype' operation on
- * `password' (with salt `salt' and the enctype specific data string
- * `opaque'), returning the resulting key in `key'
- */
+ q = p;
+ krb5_generate_random_block(q, et->confoundersize); /* XXX */
+ q += et->confoundersize;
+ memcpy(q, data, len);
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_key_data_salt_opaque (krb5_context context,
- krb5_enctype enctype,
- krb5_data password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
-{
- struct encryption_type *et =_find_enctype(enctype);
- struct salt_type *st;
- if(et == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- enctype);
- return KRB5_PROG_ETYPE_NOSUPP;
+ ret = create_checksum(context,
+ et->keyed_checksum,
+ crypto,
+ INTEGRITY_USAGE(usage),
+ p,
+ block_sz,
+ &cksum);
+ if(ret == 0 && cksum.checksum.length != checksum_sz) {
+ free_Checksum (&cksum);
+ krb5_clear_error_message (context);
+ ret = KRB5_CRYPTO_INTERNAL;
}
- for(st = et->keytype->string_to_key; st && st->type; st++)
- if(st->type == salt.salttype)
- return (*st->string_to_key)(context, enctype, password,
- salt, opaque, key);
- krb5_set_error_string(context, "salt type %d not supported",
- salt.salttype);
- return HEIM_ERR_SALTTYPE_NOSUPP;
+ if(ret)
+ goto fail;
+ memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
+ free_Checksum (&cksum);
+ ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+ if(ret)
+ goto fail;
+ ret = _key_schedule(context, dkey);
+ if(ret)
+ goto fail;
+ ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
+ if (ret)
+ goto fail;
+ result->data = p;
+ result->length = total_sz;
+ return 0;
+ fail:
+ memset(p, 0, total_sz);
+ free(p);
+ return ret;
}
-/*
- * Do a string -> key for encryption type `enctype' operation on the
- * string `password' (with salt `salt'), returning the resulting key
- * in `key'
- */
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_key_salt (krb5_context context,
- krb5_enctype enctype,
- const char *password,
- krb5_salt salt,
- krb5_keyblock *key)
+static krb5_error_code
+encrypt_internal(krb5_context context,
+ krb5_crypto crypto,
+ const void *data,
+ size_t len,
+ krb5_data *result,
+ void *ivec)
{
- krb5_data pw;
- pw.data = rk_UNCONST(password);
- pw.length = strlen(password);
- return krb5_string_to_key_data_salt(context, enctype, pw, salt, key);
-}
+ size_t sz, block_sz, checksum_sz;
+ Checksum cksum;
+ unsigned char *p, *q;
+ krb5_error_code ret;
+ const struct _krb5_encryption_type *et = crypto->et;
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_key_salt_opaque (krb5_context context,
- krb5_enctype enctype,
- const char *password,
- krb5_salt salt,
- krb5_data opaque,
- krb5_keyblock *key)
-{
- krb5_data pw;
- pw.data = rk_UNCONST(password);
- pw.length = strlen(password);
- return krb5_string_to_key_data_salt_opaque(context, enctype,
- pw, salt, opaque, key);
-}
+ checksum_sz = CHECKSUMSIZE(et->checksum);
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_keytype_to_string(krb5_context context,
- krb5_keytype keytype,
- char **string)
-{
- struct key_type *kt = _find_keytype(keytype);
- if(kt == NULL) {
- krb5_set_error_string(context, "key type %d not supported", keytype);
- return KRB5_PROG_KEYTYPE_NOSUPP;
- }
- *string = strdup(kt->name);
- if(*string == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ sz = et->confoundersize + checksum_sz + len;
+ block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
+ p = calloc(1, block_sz);
+ if(p == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
- return 0;
-}
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_keytype(krb5_context context,
- const char *string,
- krb5_keytype *keytype)
-{
- int i;
- for(i = 0; i < num_keytypes; i++)
- if(strcasecmp(keytypes[i]->name, string) == 0){
- *keytype = keytypes[i]->type;
- return 0;
- }
- krb5_set_error_string(context, "key type %s not supported", string);
- return KRB5_PROG_KEYTYPE_NOSUPP;
-}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_enctype_keysize(krb5_context context,
- krb5_enctype type,
- size_t *keysize)
-{
- struct encryption_type *et = _find_enctype(type);
- if(et == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- type);
- return KRB5_PROG_ETYPE_NOSUPP;
- }
- *keysize = et->keytype->size;
- return 0;
-}
+ q = p;
+ krb5_generate_random_block(q, et->confoundersize); /* XXX */
+ q += et->confoundersize;
+ memset(q, 0, checksum_sz);
+ q += checksum_sz;
+ memcpy(q, data, len);
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_generate_random_keyblock(krb5_context context,
- krb5_enctype type,
- krb5_keyblock *key)
-{
- krb5_error_code ret;
- struct encryption_type *et = _find_enctype(type);
- if(et == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- type);
- return KRB5_PROG_ETYPE_NOSUPP;
+ ret = create_checksum(context,
+ et->checksum,
+ crypto,
+ 0,
+ p,
+ block_sz,
+ &cksum);
+ if(ret == 0 && cksum.checksum.length != checksum_sz) {
+ krb5_clear_error_message (context);
+ free_Checksum(&cksum);
+ ret = KRB5_CRYPTO_INTERNAL;
}
- ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
- if(ret)
+ if(ret)
+ goto fail;
+ memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
+ free_Checksum(&cksum);
+ ret = _key_schedule(context, &crypto->key);
+ if(ret)
+ goto fail;
+ ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
+ if (ret) {
+ memset(p, 0, block_sz);
+ free(p);
return ret;
- key->keytype = type;
- if(et->keytype->random_key)
- (*et->keytype->random_key)(context, key);
- else
- krb5_generate_random_block(key->keyvalue.data,
- key->keyvalue.length);
+ }
+ result->data = p;
+ result->length = block_sz;
return 0;
+ fail:
+ memset(p, 0, block_sz);
+ free(p);
+ return ret;
}
static krb5_error_code
-_key_schedule(krb5_context context,
- struct key_data *key,
- const void *params)
+encrypt_internal_special(krb5_context context,
+ krb5_crypto crypto,
+ int usage,
+ const void *data,
+ size_t len,
+ krb5_data *result,
+ void *ivec)
{
+ struct _krb5_encryption_type *et = crypto->et;
+ size_t cksum_sz = CHECKSUMSIZE(et->checksum);
+ size_t sz = len + cksum_sz + et->confoundersize;
+ char *tmp, *p;
krb5_error_code ret;
- struct encryption_type *et = _find_enctype(key->key->keytype);
- struct key_type *kt = et->keytype;
- if(kt->schedule == NULL)
- return 0;
- if (key->schedule != NULL)
- return 0;
- ALLOC(key->schedule, 1);
- if(key->schedule == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ tmp = malloc (sz);
+ if (tmp == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
- ret = krb5_data_alloc(key->schedule, kt->schedule_size);
- if(ret) {
- free(key->schedule);
- key->schedule = NULL;
+ p = tmp;
+ memset (p, 0, cksum_sz);
+ p += cksum_sz;
+ krb5_generate_random_block(p, et->confoundersize);
+ p += et->confoundersize;
+ memcpy (p, data, len);
+ ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
+ if (ret) {
+ memset(tmp, 0, sz);
+ free(tmp);
return ret;
}
- (*kt->schedule)(context, key, params);
+ result->data = tmp;
+ result->length = sz;
return 0;
}
-/************************************************************
- * *
- ************************************************************/
-
-static void
-NONE_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
-}
-
-static void
-CRC32_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- u_int32_t crc;
- unsigned char *r = C->checksum.data;
- _krb5_crc_init_table ();
- crc = _krb5_crc_update (data, len, 0);
- r[0] = crc & 0xff;
- r[1] = (crc >> 8) & 0xff;
- r[2] = (crc >> 16) & 0xff;
- r[3] = (crc >> 24) & 0xff;
-}
-
-static void
-RSA_MD4_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- MD4_CTX m;
-
- MD4_Init (&m);
- MD4_Update (&m, data, len);
- MD4_Final (C->checksum.data, &m);
-}
-
-static void
-RSA_MD4_DES_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *cksum)
-{
- MD4_CTX md4;
- DES_cblock ivec;
- unsigned char *p = cksum->checksum.data;
-
- krb5_generate_random_block(p, 8);
- MD4_Init (&md4);
- MD4_Update (&md4, p, 8);
- MD4_Update (&md4, data, len);
- MD4_Final (p + 8, &md4);
- memset (&ivec, 0, sizeof(ivec));
- DES_cbc_encrypt(p,
- p,
- 24,
- key->schedule->data,
- &ivec,
- DES_ENCRYPT);
-}
-
-static krb5_error_code
-RSA_MD4_DES_verify(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- MD4_CTX md4;
- unsigned char tmp[24];
- unsigned char res[16];
- DES_cblock ivec;
- krb5_error_code ret = 0;
-
- memset(&ivec, 0, sizeof(ivec));
- DES_cbc_encrypt(C->checksum.data,
- (void*)tmp,
- C->checksum.length,
- key->schedule->data,
- &ivec,
- DES_DECRYPT);
- MD4_Init (&md4);
- MD4_Update (&md4, tmp, 8); /* confounder */
- MD4_Update (&md4, data, len);
- MD4_Final (res, &md4);
- if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
- krb5_clear_error_string (context);
- ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
- }
- memset(tmp, 0, sizeof(tmp));
- memset(res, 0, sizeof(res));
- return ret;
-}
-
-static void
-RSA_MD5_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- MD5_CTX m;
-
- MD5_Init (&m);
- MD5_Update(&m, data, len);
- MD5_Final (C->checksum.data, &m);
-}
-
-static void
-RSA_MD5_DES_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- MD5_CTX md5;
- DES_cblock ivec;
- unsigned char *p = C->checksum.data;
-
- krb5_generate_random_block(p, 8);
- MD5_Init (&md5);
- MD5_Update (&md5, p, 8);
- MD5_Update (&md5, data, len);
- MD5_Final (p + 8, &md5);
- memset (&ivec, 0, sizeof(ivec));
- DES_cbc_encrypt(p,
- p,
- 24,
- key->schedule->data,
- &ivec,
- DES_ENCRYPT);
-}
-
-static krb5_error_code
-RSA_MD5_DES_verify(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- MD5_CTX md5;
- unsigned char tmp[24];
- unsigned char res[16];
- DES_cblock ivec;
- DES_key_schedule *sched = key->schedule->data;
- krb5_error_code ret = 0;
-
- memset(&ivec, 0, sizeof(ivec));
- DES_cbc_encrypt(C->checksum.data,
- (void*)tmp,
- C->checksum.length,
- &sched[0],
- &ivec,
- DES_DECRYPT);
- MD5_Init (&md5);
- MD5_Update (&md5, tmp, 8); /* confounder */
- MD5_Update (&md5, data, len);
- MD5_Final (res, &md5);
- if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
- krb5_clear_error_string (context);
- ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
- }
- memset(tmp, 0, sizeof(tmp));
- memset(res, 0, sizeof(res));
- return ret;
-}
-
-static void
-RSA_MD5_DES3_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- MD5_CTX md5;
- DES_cblock ivec;
- unsigned char *p = C->checksum.data;
- DES_key_schedule *sched = key->schedule->data;
-
- krb5_generate_random_block(p, 8);
- MD5_Init (&md5);
- MD5_Update (&md5, p, 8);
- MD5_Update (&md5, data, len);
- MD5_Final (p + 8, &md5);
- memset (&ivec, 0, sizeof(ivec));
- DES_ede3_cbc_encrypt(p,
- p,
- 24,
- &sched[0], &sched[1], &sched[2],
- &ivec,
- DES_ENCRYPT);
-}
-
-static krb5_error_code
-RSA_MD5_DES3_verify(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- MD5_CTX md5;
- unsigned char tmp[24];
- unsigned char res[16];
- DES_cblock ivec;
- DES_key_schedule *sched = key->schedule->data;
- krb5_error_code ret = 0;
-
- memset(&ivec, 0, sizeof(ivec));
- DES_ede3_cbc_encrypt(C->checksum.data,
- (void*)tmp,
- C->checksum.length,
- &sched[0], &sched[1], &sched[2],
- &ivec,
- DES_DECRYPT);
- MD5_Init (&md5);
- MD5_Update (&md5, tmp, 8); /* confounder */
- MD5_Update (&md5, data, len);
- MD5_Final (res, &md5);
- if(memcmp(res, tmp + 8, sizeof(res)) != 0) {
- krb5_clear_error_string (context);
- ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
- }
- memset(tmp, 0, sizeof(tmp));
- memset(res, 0, sizeof(res));
- return ret;
-}
-
-static void
-SHA1_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *C)
-{
- SHA_CTX m;
-
- SHA1_Init(&m);
- SHA1_Update(&m, data, len);
- SHA1_Final(C->checksum.data, &m);
-}
-
-/* HMAC according to RFC2104 */
-static krb5_error_code
-hmac(krb5_context context,
- struct checksum_type *cm,
- const void *data,
- size_t len,
- unsigned usage,
- struct key_data *keyblock,
- Checksum *result)
-{
- unsigned char *ipad, *opad;
- unsigned char *key;
- size_t key_len;
- int i;
-
- ipad = malloc(cm->blocksize + len);
- if (ipad == NULL)
- return ENOMEM;
- opad = malloc(cm->blocksize + cm->checksumsize);
- if (opad == NULL) {
- free(ipad);
- return ENOMEM;
- }
- memset(ipad, 0x36, cm->blocksize);
- memset(opad, 0x5c, cm->blocksize);
-
- if(keyblock->key->keyvalue.length > cm->blocksize){
- (*cm->checksum)(context,
- keyblock,
- keyblock->key->keyvalue.data,
- keyblock->key->keyvalue.length,
- usage,
- result);
- key = result->checksum.data;
- key_len = result->checksum.length;
- } else {
- key = keyblock->key->keyvalue.data;
- key_len = keyblock->key->keyvalue.length;
- }
- for(i = 0; i < key_len; i++){
- ipad[i] ^= key[i];
- opad[i] ^= key[i];
- }
- memcpy(ipad + cm->blocksize, data, len);
- (*cm->checksum)(context, keyblock, ipad, cm->blocksize + len,
- usage, result);
- memcpy(opad + cm->blocksize, result->checksum.data,
- result->checksum.length);
- (*cm->checksum)(context, keyblock, opad,
- cm->blocksize + cm->checksumsize, usage, result);
- memset(ipad, 0, cm->blocksize + len);
- free(ipad);
- memset(opad, 0, cm->blocksize + cm->checksumsize);
- free(opad);
-
- return 0;
-}
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_hmac(krb5_context context,
- krb5_cksumtype cktype,
- const void *data,
- size_t len,
- unsigned usage,
- krb5_keyblock *key,
- Checksum *result)
-{
- struct checksum_type *c = _find_checksum(cktype);
- struct key_data kd;
- krb5_error_code ret;
-
- if (c == NULL) {
- krb5_set_error_string (context, "checksum type %d not supported",
- cktype);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
-
- kd.key = key;
- kd.schedule = NULL;
-
- ret = hmac(context, c, data, len, usage, &kd, result);
-
- if (kd.schedule)
- krb5_free_data(context, kd.schedule);
-
- return ret;
- }
-
-static void
-SP_HMAC_SHA1_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *result)
-{
- struct checksum_type *c = _find_checksum(CKSUMTYPE_SHA1);
- Checksum res;
- char sha1_data[20];
- krb5_error_code ret;
-
- res.checksum.data = sha1_data;
- res.checksum.length = sizeof(sha1_data);
-
- ret = hmac(context, c, data, len, usage, key, &res);
- if (ret)
- krb5_abortx(context, "hmac failed");
- memcpy(result->checksum.data, res.checksum.data, result->checksum.length);
-}
-
-/*
- * checksum according to section 5. of draft-brezak-win2k-krb-rc4-hmac-03.txt
- */
-
-static void
-HMAC_MD5_checksum(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *result)
-{
- MD5_CTX md5;
- struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
- const char signature[] = "signaturekey";
- Checksum ksign_c;
- struct key_data ksign;
- krb5_keyblock kb;
- unsigned char t[4];
- unsigned char tmp[16];
- unsigned char ksign_c_data[16];
- krb5_error_code ret;
-
- ksign_c.checksum.length = sizeof(ksign_c_data);
- ksign_c.checksum.data = ksign_c_data;
- ret = hmac(context, c, signature, sizeof(signature), 0, key, &ksign_c);
- if (ret)
- krb5_abortx(context, "hmac failed");
- ksign.key = &kb;
- kb.keyvalue = ksign_c.checksum;
- MD5_Init (&md5);
- t[0] = (usage >> 0) & 0xFF;
- t[1] = (usage >> 8) & 0xFF;
- t[2] = (usage >> 16) & 0xFF;
- t[3] = (usage >> 24) & 0xFF;
- MD5_Update (&md5, t, 4);
- MD5_Update (&md5, data, len);
- MD5_Final (tmp, &md5);
- ret = hmac(context, c, tmp, sizeof(tmp), 0, &ksign, result);
- if (ret)
- krb5_abortx(context, "hmac failed");
-}
-
-/*
- * same as previous but being used while encrypting.
- */
-
-static void
-HMAC_MD5_checksum_enc(krb5_context context,
- struct key_data *key,
- const void *data,
- size_t len,
- unsigned usage,
- Checksum *result)
-{
- struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
- Checksum ksign_c;
- struct key_data ksign;
- krb5_keyblock kb;
- unsigned char t[4];
- unsigned char ksign_c_data[16];
- krb5_error_code ret;
-
- t[0] = (usage >> 0) & 0xFF;
- t[1] = (usage >> 8) & 0xFF;
- t[2] = (usage >> 16) & 0xFF;
- t[3] = (usage >> 24) & 0xFF;
-
- ksign_c.checksum.length = sizeof(ksign_c_data);
- ksign_c.checksum.data = ksign_c_data;
- ret = hmac(context, c, t, sizeof(t), 0, key, &ksign_c);
- if (ret)
- krb5_abortx(context, "hmac failed");
- ksign.key = &kb;
- kb.keyvalue = ksign_c.checksum;
- ret = hmac(context, c, data, len, 0, &ksign, result);
- if (ret)
- krb5_abortx(context, "hmac failed");
-}
-
-static struct checksum_type checksum_none = {
- CKSUMTYPE_NONE,
- "none",
- 1,
- 0,
- 0,
- NONE_checksum,
- NULL
-};
-static struct checksum_type checksum_crc32 = {
- CKSUMTYPE_CRC32,
- "crc32",
- 1,
- 4,
- 0,
- CRC32_checksum,
- NULL
-};
-static struct checksum_type checksum_rsa_md4 = {
- CKSUMTYPE_RSA_MD4,
- "rsa-md4",
- 64,
- 16,
- F_CPROOF,
- RSA_MD4_checksum,
- NULL
-};
-static struct checksum_type checksum_rsa_md4_des = {
- CKSUMTYPE_RSA_MD4_DES,
- "rsa-md4-des",
- 64,
- 24,
- F_KEYED | F_CPROOF | F_VARIANT,
- RSA_MD4_DES_checksum,
- RSA_MD4_DES_verify
-};
-#if 0
-static struct checksum_type checksum_des_mac = {
- CKSUMTYPE_DES_MAC,
- "des-mac",
- 0,
- 0,
- 0,
- DES_MAC_checksum
-};
-static struct checksum_type checksum_des_mac_k = {
- CKSUMTYPE_DES_MAC_K,
- "des-mac-k",
- 0,
- 0,
- 0,
- DES_MAC_K_checksum
-};
-static struct checksum_type checksum_rsa_md4_des_k = {
- CKSUMTYPE_RSA_MD4_DES_K,
- "rsa-md4-des-k",
- 0,
- 0,
- 0,
- RSA_MD4_DES_K_checksum,
- RSA_MD4_DES_K_verify
-};
-#endif
-static struct checksum_type checksum_rsa_md5 = {
- CKSUMTYPE_RSA_MD5,
- "rsa-md5",
- 64,
- 16,
- F_CPROOF,
- RSA_MD5_checksum,
- NULL
-};
-static struct checksum_type checksum_rsa_md5_des = {
- CKSUMTYPE_RSA_MD5_DES,
- "rsa-md5-des",
- 64,
- 24,
- F_KEYED | F_CPROOF | F_VARIANT,
- RSA_MD5_DES_checksum,
- RSA_MD5_DES_verify
-};
-static struct checksum_type checksum_rsa_md5_des3 = {
- CKSUMTYPE_RSA_MD5_DES3,
- "rsa-md5-des3",
- 64,
- 24,
- F_KEYED | F_CPROOF | F_VARIANT,
- RSA_MD5_DES3_checksum,
- RSA_MD5_DES3_verify
-};
-static struct checksum_type checksum_sha1 = {
- CKSUMTYPE_SHA1,
- "sha1",
- 64,
- 20,
- F_CPROOF,
- SHA1_checksum,
- NULL
-};
-static struct checksum_type checksum_hmac_sha1_des3 = {
- CKSUMTYPE_HMAC_SHA1_DES3,
- "hmac-sha1-des3",
- 64,
- 20,
- F_KEYED | F_CPROOF | F_DERIVED,
- SP_HMAC_SHA1_checksum,
- NULL
-};
-
-static struct checksum_type checksum_hmac_sha1_aes128 = {
- CKSUMTYPE_HMAC_SHA1_96_AES_128,
- "hmac-sha1-96-aes128",
- 64,
- 12,
- F_KEYED | F_CPROOF | F_DERIVED,
- SP_HMAC_SHA1_checksum,
- NULL
-};
-
-static struct checksum_type checksum_hmac_sha1_aes256 = {
- CKSUMTYPE_HMAC_SHA1_96_AES_256,
- "hmac-sha1-96-aes256",
- 64,
- 12,
- F_KEYED | F_CPROOF | F_DERIVED,
- SP_HMAC_SHA1_checksum,
- NULL
-};
-
-static struct checksum_type checksum_hmac_md5 = {
- CKSUMTYPE_HMAC_MD5,
- "hmac-md5",
- 64,
- 16,
- F_KEYED | F_CPROOF,
- HMAC_MD5_checksum,
- NULL
-};
-
-static struct checksum_type checksum_hmac_md5_enc = {
- CKSUMTYPE_HMAC_MD5_ENC,
- "hmac-md5-enc",
- 64,
- 16,
- F_KEYED | F_CPROOF | F_PSEUDO,
- HMAC_MD5_checksum_enc,
- NULL
-};
-
-static struct checksum_type *checksum_types[] = {
- &checksum_none,
- &checksum_crc32,
- &checksum_rsa_md4,
- &checksum_rsa_md4_des,
-#if 0
- &checksum_des_mac,
- &checksum_des_mac_k,
- &checksum_rsa_md4_des_k,
-#endif
- &checksum_rsa_md5,
- &checksum_rsa_md5_des,
- &checksum_rsa_md5_des3,
- &checksum_sha1,
- &checksum_hmac_sha1_des3,
- &checksum_hmac_sha1_aes128,
- &checksum_hmac_sha1_aes256,
- &checksum_hmac_md5,
- &checksum_hmac_md5_enc
-};
-
-static int num_checksums = sizeof(checksum_types) / sizeof(checksum_types[0]);
-
-static struct checksum_type *
-_find_checksum(krb5_cksumtype type)
-{
- int i;
- for(i = 0; i < num_checksums; i++)
- if(checksum_types[i]->type == type)
- return checksum_types[i];
- return NULL;
-}
-
-static krb5_error_code
-get_checksum_key(krb5_context context,
- krb5_crypto crypto,
- unsigned usage, /* not krb5_key_usage */
- struct checksum_type *ct,
- struct key_data **key)
-{
- krb5_error_code ret = 0;
-
- if(ct->flags & F_DERIVED)
- ret = _get_derived_key(context, crypto, usage, key);
- else if(ct->flags & F_VARIANT) {
- int i;
-
- *key = _new_derived_key(crypto, 0xff/* KRB5_KU_RFC1510_VARIANT */);
- if(*key == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
- }
- ret = krb5_copy_keyblock(context, crypto->key.key, &(*key)->key);
- if(ret)
- return ret;
- for(i = 0; i < (*key)->key->keyvalue.length; i++)
- ((unsigned char*)(*key)->key->keyvalue.data)[i] ^= 0xF0;
- } else {
- *key = &crypto->key;
- }
- if(ret == 0)
- ret = _key_schedule(context, *key, crypto->params);
- return ret;
-}
-
-static krb5_error_code
-create_checksum (krb5_context context,
- struct checksum_type *ct,
- krb5_crypto crypto,
- unsigned usage,
- void *data,
- size_t len,
- Checksum *result)
-{
- krb5_error_code ret;
- struct key_data *dkey;
- int keyed_checksum;
-
- if (ct->flags & F_DISABLED) {
- krb5_clear_error_string (context);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
- keyed_checksum = (ct->flags & F_KEYED) != 0;
- if(keyed_checksum && crypto == NULL) {
- krb5_clear_error_string (context);
- return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
- }
- if(keyed_checksum) {
- ret = get_checksum_key(context, crypto, usage, ct, &dkey);
- if (ret)
- return ret;
- } else
- dkey = NULL;
- result->cksumtype = ct->type;
- krb5_data_alloc(&result->checksum, ct->checksumsize);
- (*ct->checksum)(context, dkey, data, len, usage, result);
- return 0;
-}
-
-static int
-arcfour_checksum_p(struct checksum_type *ct, krb5_crypto crypto)
-{
- return (ct->type == CKSUMTYPE_HMAC_MD5) &&
- (crypto->key.key->keytype == KEYTYPE_ARCFOUR);
-}
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_create_checksum(krb5_context context,
- krb5_crypto crypto,
- krb5_key_usage usage,
- int type,
- void *data,
- size_t len,
- Checksum *result)
-{
- struct checksum_type *ct = NULL;
- unsigned keyusage;
-
- /* type 0 -> pick from crypto */
- if (type) {
- ct = _find_checksum(type);
- } else if (crypto) {
- ct = crypto->et->keyed_checksum;
- if (ct == NULL)
- ct = crypto->et->checksum;
- }
-
- if(ct == NULL) {
- krb5_set_error_string (context, "checksum type %d not supported",
- type);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
-
- if (arcfour_checksum_p(ct, crypto)) {
- keyusage = usage;
- usage2arcfour(context, &keyusage);
- } else
- keyusage = CHECKSUM_USAGE(usage);
-
- return create_checksum(context, ct, crypto, keyusage,
- data, len, result);
-}
-
-static krb5_error_code
-verify_checksum(krb5_context context,
- krb5_crypto crypto,
- unsigned usage, /* not krb5_key_usage */
- void *data,
- size_t len,
- Checksum *cksum)
-{
- krb5_error_code ret;
- struct key_data *dkey;
- int keyed_checksum;
- Checksum c;
- struct checksum_type *ct;
-
- ct = _find_checksum(cksum->cksumtype);
- if (ct == NULL || (ct->flags & F_DISABLED)) {
- krb5_set_error_string (context, "checksum type %d not supported",
- cksum->cksumtype);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
- if(ct->checksumsize != cksum->checksum.length) {
- krb5_clear_error_string (context);
- return KRB5KRB_AP_ERR_BAD_INTEGRITY; /* XXX */
- }
- keyed_checksum = (ct->flags & F_KEYED) != 0;
- if(keyed_checksum && crypto == NULL) {
- krb5_clear_error_string (context);
- return KRB5_PROG_SUMTYPE_NOSUPP; /* XXX */
- }
- if(keyed_checksum)
- ret = get_checksum_key(context, crypto, usage, ct, &dkey);
- else
- dkey = NULL;
- if(ct->verify)
- return (*ct->verify)(context, dkey, data, len, usage, cksum);
-
- ret = krb5_data_alloc (&c.checksum, ct->checksumsize);
- if (ret)
- return ret;
-
- (*ct->checksum)(context, dkey, data, len, usage, &c);
-
- if(c.checksum.length != cksum->checksum.length ||
- memcmp(c.checksum.data, cksum->checksum.data, c.checksum.length)) {
- krb5_clear_error_string (context);
- ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
- } else {
- ret = 0;
- }
- krb5_data_free (&c.checksum);
- return ret;
-}
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_verify_checksum(krb5_context context,
- krb5_crypto crypto,
- krb5_key_usage usage,
- void *data,
- size_t len,
- Checksum *cksum)
-{
- struct checksum_type *ct;
- unsigned keyusage;
-
- ct = _find_checksum(cksum->cksumtype);
- if(ct == NULL) {
- krb5_set_error_string (context, "checksum type %d not supported",
- cksum->cksumtype);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
-
- if (arcfour_checksum_p(ct, crypto)) {
- keyusage = usage;
- usage2arcfour(context, &keyusage);
- } else
- keyusage = CHECKSUM_USAGE(usage);
-
- return verify_checksum(context, crypto, keyusage,
- data, len, cksum);
-}
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_crypto_get_checksum_type(krb5_context context,
- krb5_crypto crypto,
- krb5_cksumtype *type)
-{
- struct checksum_type *ct = NULL;
-
- if (crypto != NULL) {
- ct = crypto->et->keyed_checksum;
- if (ct == NULL)
- ct = crypto->et->checksum;
- }
-
- if (ct == NULL) {
- krb5_set_error_string (context, "checksum type not found");
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
-
- *type = ct->type;
-
- return 0;
-}
-
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_checksumsize(krb5_context context,
- krb5_cksumtype type,
- size_t *size)
-{
- struct checksum_type *ct = _find_checksum(type);
- if(ct == NULL) {
- krb5_set_error_string (context, "checksum type %d not supported",
- type);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
- *size = ct->checksumsize;
- return 0;
-}
-
-krb5_boolean KRB5_LIB_FUNCTION
-krb5_checksum_is_keyed(krb5_context context,
- krb5_cksumtype type)
-{
- struct checksum_type *ct = _find_checksum(type);
- if(ct == NULL) {
- if (context)
- krb5_set_error_string (context, "checksum type %d not supported",
- type);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
- return ct->flags & F_KEYED;
-}
-
-krb5_boolean KRB5_LIB_FUNCTION
-krb5_checksum_is_collision_proof(krb5_context context,
- krb5_cksumtype type)
-{
- struct checksum_type *ct = _find_checksum(type);
- if(ct == NULL) {
- if (context)
- krb5_set_error_string (context, "checksum type %d not supported",
- type);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
- return ct->flags & F_CPROOF;
-}
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_checksum_disable(krb5_context context,
- krb5_cksumtype type)
-{
- struct checksum_type *ct = _find_checksum(type);
- if(ct == NULL) {
- if (context)
- krb5_set_error_string (context, "checksum type %d not supported",
- type);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
- ct->flags |= F_DISABLED;
- return 0;
-}
-
-/************************************************************
- * *
- ************************************************************/
-
-static krb5_error_code
-NULL_encrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ivec)
-{
- return 0;
-}
-
-static krb5_error_code
-DES_CBC_encrypt_null_ivec(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ignore_ivec)
-{
- DES_cblock ivec;
- DES_key_schedule *s = key->schedule->data;
- memset(&ivec, 0, sizeof(ivec));
- DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
- return 0;
-}
-
-static krb5_error_code
-DES_CBC_encrypt_key_ivec(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ignore_ivec)
-{
- DES_cblock ivec;
- DES_key_schedule *s = key->schedule->data;
- memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
- DES_cbc_encrypt(data, data, len, s, &ivec, encryptp);
- return 0;
-}
-
-static krb5_error_code
-DES3_CBC_encrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ivec)
-{
- DES_cblock local_ivec;
- DES_key_schedule *s = key->schedule->data;
- if(ivec == NULL) {
- ivec = &local_ivec;
- memset(local_ivec, 0, sizeof(local_ivec));
- }
- DES_ede3_cbc_encrypt(data, data, len, &s[0], &s[1], &s[2], ivec, encryptp);
- return 0;
-}
-
-static krb5_error_code
-DES_CFB64_encrypt_null_ivec(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ignore_ivec)
-{
- DES_cblock ivec;
- int num = 0;
- DES_key_schedule *s = key->schedule->data;
- memset(&ivec, 0, sizeof(ivec));
-
- DES_cfb64_encrypt(data, data, len, s, &ivec, &num, encryptp);
- return 0;
-}
-
-static krb5_error_code
-DES_PCBC_encrypt_key_ivec(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ignore_ivec)
-{
- DES_cblock ivec;
- DES_key_schedule *s = key->schedule->data;
- memcpy(&ivec, key->key->keyvalue.data, sizeof(ivec));
-
- DES_pcbc_encrypt(data, data, len, s, &ivec, encryptp);
- return 0;
-}
-
-/*
- * AES draft-raeburn-krb-rijndael-krb-02
- */
-
-void KRB5_LIB_FUNCTION
-_krb5_aes_cts_encrypt(const unsigned char *in, unsigned char *out,
- size_t len, const void *aes_key,
- unsigned char *ivec, const int encryptp)
-{
- unsigned char tmp[AES_BLOCK_SIZE];
- const AES_KEY *key = aes_key; /* XXX remove this when we always have AES */
- int i;
-
- /*
- * In the framework of kerberos, the length can never be shorter
- * then at least one blocksize.
- */
-
- if (encryptp) {
-
- while(len > AES_BLOCK_SIZE) {
- for (i = 0; i < AES_BLOCK_SIZE; i++)
- tmp[i] = in[i] ^ ivec[i];
- AES_encrypt(tmp, out, key);
- memcpy(ivec, out, AES_BLOCK_SIZE);
- len -= AES_BLOCK_SIZE;
- in += AES_BLOCK_SIZE;
- out += AES_BLOCK_SIZE;
- }
-
- for (i = 0; i < len; i++)
- tmp[i] = in[i] ^ ivec[i];
- for (; i < AES_BLOCK_SIZE; i++)
- tmp[i] = 0 ^ ivec[i];
-
- AES_encrypt(tmp, out - AES_BLOCK_SIZE, key);
-
- memcpy(out, ivec, len);
- memcpy(ivec, out - AES_BLOCK_SIZE, AES_BLOCK_SIZE);
-
- } else {
- unsigned char tmp2[AES_BLOCK_SIZE];
- unsigned char tmp3[AES_BLOCK_SIZE];
-
- while(len > AES_BLOCK_SIZE * 2) {
- memcpy(tmp, in, AES_BLOCK_SIZE);
- AES_decrypt(in, out, key);
- for (i = 0; i < AES_BLOCK_SIZE; i++)
- out[i] ^= ivec[i];
- memcpy(ivec, tmp, AES_BLOCK_SIZE);
- len -= AES_BLOCK_SIZE;
- in += AES_BLOCK_SIZE;
- out += AES_BLOCK_SIZE;
- }
-
- len -= AES_BLOCK_SIZE;
-
- memcpy(tmp, in, AES_BLOCK_SIZE); /* save last iv */
- AES_decrypt(in, tmp2, key);
-
- memcpy(tmp3, in + AES_BLOCK_SIZE, len);
- memcpy(tmp3 + len, tmp2 + len, AES_BLOCK_SIZE - len); /* xor 0 */
-
- for (i = 0; i < len; i++)
- out[i + AES_BLOCK_SIZE] = tmp2[i] ^ tmp3[i];
-
- AES_decrypt(tmp3, out, key);
- for (i = 0; i < AES_BLOCK_SIZE; i++)
- out[i] ^= ivec[i];
- memcpy(ivec, tmp, AES_BLOCK_SIZE);
- }
-}
-
static krb5_error_code
-AES_CTS_encrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ivec)
+decrypt_internal_derived(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage,
+ void *data,
+ size_t len,
+ krb5_data *result,
+ void *ivec)
{
- struct krb5_aes_schedule *aeskey = key->schedule->data;
- char local_ivec[AES_BLOCK_SIZE];
- AES_KEY *k;
+ size_t checksum_sz;
+ Checksum cksum;
+ unsigned char *p;
+ krb5_error_code ret;
+ struct _krb5_key_data *dkey;
+ struct _krb5_encryption_type *et = crypto->et;
+ unsigned long l;
- if (encryptp)
- k = &aeskey->ekey;
- else
- k = &aeskey->dkey;
-
- if (len < AES_BLOCK_SIZE)
- krb5_abortx(context, "invalid use of AES_CTS_encrypt");
- if (len == AES_BLOCK_SIZE) {
- if (encryptp)
- AES_encrypt(data, data, k);
- else
- AES_decrypt(data, data, k);
- } else {
- if(ivec == NULL) {
- memset(local_ivec, 0, sizeof(local_ivec));
- ivec = local_ivec;
- }
- _krb5_aes_cts_encrypt(data, data, len, k, ivec, encryptp);
+ checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
+ if (len < checksum_sz + et->confoundersize) {
+ krb5_set_error_message(context, KRB5_BAD_MSIZE,
+ N_("Encrypted data shorter then "
+ "checksum + confunder", ""));
+ return KRB5_BAD_MSIZE;
}
- return 0;
-}
-
-static krb5_error_code
-AES_CBC_encrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ivec)
-{
- struct krb5_aes_schedule *aeskey = key->schedule->data;
- char local_ivec[AES_BLOCK_SIZE];
- AES_KEY *k;
-
- if (encryptp)
- k = &aeskey->ekey;
- else
- k = &aeskey->dkey;
-
- if(ivec == NULL) {
- ivec = &local_ivec;
- memset(local_ivec, 0, sizeof(local_ivec));
+ if (((len - checksum_sz) % et->padsize) != 0) {
+ krb5_clear_error_message(context);
+ return KRB5_BAD_MSIZE;
}
- AES_cbc_encrypt(data, data, len, k, ivec, encryptp);
- return 0;
-}
-
-/*
- * RC2
- */
-static krb5_error_code
-RC2_CBC_encrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ivec)
-{
- unsigned char local_ivec[8];
- RC2_KEY *s = key->schedule->data;
- if(ivec == NULL) {
- ivec = &local_ivec;
- memset(local_ivec, 0, sizeof(local_ivec));
+ p = malloc(len);
+ if(len != 0 && p == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
}
- RC2_cbc_encrypt(data, data, len, s, ivec, encryptp);
- return 0;
-}
-
-/*
- * section 6 of draft-brezak-win2k-krb-rc4-hmac-03
- *
- * warning: not for small children
- */
-
-static krb5_error_code
-ARCFOUR_subencrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- unsigned usage,
- void *ivec)
-{
- struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
- Checksum k1_c, k2_c, k3_c, cksum;
- struct key_data ke;
- krb5_keyblock kb;
- unsigned char t[4];
- RC4_KEY rc4_key;
- unsigned char *cdata = data;
- unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
- krb5_error_code ret;
-
- t[0] = (usage >> 0) & 0xFF;
- t[1] = (usage >> 8) & 0xFF;
- t[2] = (usage >> 16) & 0xFF;
- t[3] = (usage >> 24) & 0xFF;
-
- k1_c.checksum.length = sizeof(k1_c_data);
- k1_c.checksum.data = k1_c_data;
-
- ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
- if (ret)
- krb5_abortx(context, "hmac failed");
-
- memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
-
- k2_c.checksum.length = sizeof(k2_c_data);
- k2_c.checksum.data = k2_c_data;
-
- ke.key = &kb;
- kb.keyvalue = k2_c.checksum;
-
- cksum.checksum.length = 16;
- cksum.checksum.data = data;
-
- ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
- if (ret)
- krb5_abortx(context, "hmac failed");
-
- ke.key = &kb;
- kb.keyvalue = k1_c.checksum;
-
- k3_c.checksum.length = sizeof(k3_c_data);
- k3_c.checksum.data = k3_c_data;
-
- ret = hmac(NULL, c, data, 16, 0, &ke, &k3_c);
- if (ret)
- krb5_abortx(context, "hmac failed");
-
- RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
- RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
- memset (k1_c_data, 0, sizeof(k1_c_data));
- memset (k2_c_data, 0, sizeof(k2_c_data));
- memset (k3_c_data, 0, sizeof(k3_c_data));
- return 0;
-}
-
-static krb5_error_code
-ARCFOUR_subdecrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- unsigned usage,
- void *ivec)
-{
- struct checksum_type *c = _find_checksum (CKSUMTYPE_RSA_MD5);
- Checksum k1_c, k2_c, k3_c, cksum;
- struct key_data ke;
- krb5_keyblock kb;
- unsigned char t[4];
- RC4_KEY rc4_key;
- unsigned char *cdata = data;
- unsigned char k1_c_data[16], k2_c_data[16], k3_c_data[16];
- unsigned char cksum_data[16];
- krb5_error_code ret;
-
- t[0] = (usage >> 0) & 0xFF;
- t[1] = (usage >> 8) & 0xFF;
- t[2] = (usage >> 16) & 0xFF;
- t[3] = (usage >> 24) & 0xFF;
-
- k1_c.checksum.length = sizeof(k1_c_data);
- k1_c.checksum.data = k1_c_data;
-
- ret = hmac(NULL, c, t, sizeof(t), 0, key, &k1_c);
- if (ret)
- krb5_abortx(context, "hmac failed");
-
- memcpy (k2_c_data, k1_c_data, sizeof(k1_c_data));
-
- k2_c.checksum.length = sizeof(k2_c_data);
- k2_c.checksum.data = k2_c_data;
-
- ke.key = &kb;
- kb.keyvalue = k1_c.checksum;
-
- k3_c.checksum.length = sizeof(k3_c_data);
- k3_c.checksum.data = k3_c_data;
-
- ret = hmac(NULL, c, cdata, 16, 0, &ke, &k3_c);
- if (ret)
- krb5_abortx(context, "hmac failed");
-
- RC4_set_key (&rc4_key, k3_c.checksum.length, k3_c.checksum.data);
- RC4 (&rc4_key, len - 16, cdata + 16, cdata + 16);
-
- ke.key = &kb;
- kb.keyvalue = k2_c.checksum;
-
- cksum.checksum.length = 16;
- cksum.checksum.data = cksum_data;
-
- ret = hmac(NULL, c, cdata + 16, len - 16, 0, &ke, &cksum);
- if (ret)
- krb5_abortx(context, "hmac failed");
+ memcpy(p, data, len);
- memset (k1_c_data, 0, sizeof(k1_c_data));
- memset (k2_c_data, 0, sizeof(k2_c_data));
- memset (k3_c_data, 0, sizeof(k3_c_data));
+ len -= checksum_sz;
- if (memcmp (cksum.checksum.data, data, 16) != 0) {
- krb5_clear_error_string (context);
- return KRB5KRB_AP_ERR_BAD_INTEGRITY;
- } else {
- return 0;
+ ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+ if(ret) {
+ free(p);
+ return ret;
}
-}
-
-/*
- * convert the usage numbers used in
- * draft-ietf-cat-kerb-key-derivation-00.txt to the ones in
- * draft-brezak-win2k-krb-rc4-hmac-04.txt
- */
-
-static krb5_error_code
-usage2arcfour (krb5_context context, unsigned *usage)
-{
- switch (*usage) {
- case KRB5_KU_AS_REP_ENC_PART : /* 3 */
- case KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : /* 9 */
- *usage = 8;
- return 0;
- case KRB5_KU_USAGE_SEAL : /* 22 */
- *usage = 13;
- return 0;
- case KRB5_KU_USAGE_SIGN : /* 23 */
- *usage = 15;
- return 0;
- case KRB5_KU_USAGE_SEQ: /* 24 */
- *usage = 0;
- return 0;
- default :
- return 0;
+ ret = _key_schedule(context, dkey);
+ if(ret) {
+ free(p);
+ return ret;
}
-}
-
-static krb5_error_code
-ARCFOUR_encrypt(krb5_context context,
- struct key_data *key,
- void *data,
- size_t len,
- krb5_boolean encryptp,
- int usage,
- void *ivec)
-{
- krb5_error_code ret;
- unsigned keyusage = usage;
-
- if((ret = usage2arcfour (context, &keyusage)) != 0)
+ ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
+ if (ret) {
+ free(p);
return ret;
+ }
- if (encryptp)
- return ARCFOUR_subencrypt (context, key, data, len, keyusage, ivec);
- else
- return ARCFOUR_subdecrypt (context, key, data, len, keyusage, ivec);
-}
-
-
-/*
- * these should currently be in reverse preference order.
- * (only relevant for !F_PSEUDO) */
-
-static struct encryption_type enctype_null = {
- ETYPE_NULL,
- "null",
- NULL,
- 1,
- 1,
- 0,
- &keytype_null,
- &checksum_none,
- NULL,
- F_DISABLED,
- NULL_encrypt,
-};
-static struct encryption_type enctype_des_cbc_crc = {
- ETYPE_DES_CBC_CRC,
- "des-cbc-crc",
- NULL,
- 8,
- 8,
- 8,
- &keytype_des,
- &checksum_crc32,
- NULL,
- 0,
- DES_CBC_encrypt_key_ivec,
-};
-static struct encryption_type enctype_des_cbc_md4 = {
- ETYPE_DES_CBC_MD4,
- "des-cbc-md4",
- NULL,
- 8,
- 8,
- 8,
- &keytype_des,
- &checksum_rsa_md4,
- &checksum_rsa_md4_des,
- 0,
- DES_CBC_encrypt_null_ivec,
-};
-static struct encryption_type enctype_des_cbc_md5 = {
- ETYPE_DES_CBC_MD5,
- "des-cbc-md5",
- NULL,
- 8,
- 8,
- 8,
- &keytype_des,
- &checksum_rsa_md5,
- &checksum_rsa_md5_des,
- 0,
- DES_CBC_encrypt_null_ivec,
-};
-static struct encryption_type enctype_arcfour_hmac_md5 = {
- ETYPE_ARCFOUR_HMAC_MD5,
- "arcfour-hmac-md5",
- NULL,
- 1,
- 1,
- 8,
- &keytype_arcfour,
- &checksum_hmac_md5,
- NULL,
- F_SPECIAL,
- ARCFOUR_encrypt
-};
-static struct encryption_type enctype_des3_cbc_md5 = {
- ETYPE_DES3_CBC_MD5,
- "des3-cbc-md5",
- NULL,
- 8,
- 8,
- 8,
- &keytype_des3,
- &checksum_rsa_md5,
- &checksum_rsa_md5_des3,
- 0,
- DES3_CBC_encrypt,
-};
-static struct encryption_type enctype_des3_cbc_sha1 = {
- ETYPE_DES3_CBC_SHA1,
- "des3-cbc-sha1",
- NULL,
- 8,
- 8,
- 8,
- &keytype_des3_derived,
- &checksum_sha1,
- &checksum_hmac_sha1_des3,
- F_DERIVED,
- DES3_CBC_encrypt,
-};
-static struct encryption_type enctype_old_des3_cbc_sha1 = {
- ETYPE_OLD_DES3_CBC_SHA1,
- "old-des3-cbc-sha1",
- NULL,
- 8,
- 8,
- 8,
- &keytype_des3,
- &checksum_sha1,
- &checksum_hmac_sha1_des3,
- 0,
- DES3_CBC_encrypt,
-};
-static struct encryption_type enctype_aes128_cts_hmac_sha1 = {
- ETYPE_AES128_CTS_HMAC_SHA1_96,
- "aes128-cts-hmac-sha1-96",
- NULL,
- 16,
- 1,
- 16,
- &keytype_aes128,
- &checksum_sha1,
- &checksum_hmac_sha1_aes128,
- F_DERIVED,
- AES_CTS_encrypt,
-};
-static struct encryption_type enctype_aes256_cts_hmac_sha1 = {
- ETYPE_AES256_CTS_HMAC_SHA1_96,
- "aes256-cts-hmac-sha1-96",
- NULL,
- 16,
- 1,
- 16,
- &keytype_aes256,
- &checksum_sha1,
- &checksum_hmac_sha1_aes256,
- F_DERIVED,
- AES_CTS_encrypt,
-};
-static unsigned aes_128_cbc_num[] = { 2, 16, 840, 1, 101, 3, 4, 1, 2 };
-static heim_oid aes_128_cbc_oid = kcrypto_oid_enc(aes_128_cbc_num);
-static struct encryption_type enctype_aes128_cbc_none = {
- ETYPE_AES128_CBC_NONE,
- "aes128-cbc-none",
- &aes_128_cbc_oid,
- 16,
- 16,
- 16,
- &keytype_aes128,
- &checksum_none,
- NULL,
- F_PSEUDO|F_PADCMS,
- AES_CBC_encrypt,
-};
-static unsigned aes_192_cbc_num[] = { 2, 16, 840, 1, 101, 3, 4, 1, 22 };
-static heim_oid aes_192_cbc_oid = kcrypto_oid_enc(aes_192_cbc_num);
-static struct encryption_type enctype_aes192_cbc_none = {
- ETYPE_AES192_CBC_NONE,
- "aes192-cbc-none",
- &aes_192_cbc_oid,
- 16,
- 16,
- 16,
- &keytype_aes192,
- &checksum_none,
- NULL,
- F_PSEUDO|F_PADCMS,
- AES_CBC_encrypt,
-};
-static unsigned aes_256_cbc_num[] = { 2, 16, 840, 1, 101, 3, 4, 1, 42 };
-static heim_oid aes_256_cbc_oid = kcrypto_oid_enc(aes_256_cbc_num);
-static struct encryption_type enctype_aes256_cbc_none = {
- ETYPE_AES256_CBC_NONE,
- "aes256-cbc-none",
- &aes_256_cbc_oid,
- 16,
- 16,
- 16,
- &keytype_aes256,
- &checksum_none,
- NULL,
- F_PSEUDO|F_PADCMS,
- AES_CBC_encrypt,
-};
-static struct encryption_type enctype_des_cbc_none = {
- ETYPE_DES_CBC_NONE,
- "des-cbc-none",
- NULL,
- 8,
- 8,
- 0,
- &keytype_des,
- &checksum_none,
- NULL,
- F_PSEUDO,
- DES_CBC_encrypt_null_ivec,
-};
-static struct encryption_type enctype_des_cfb64_none = {
- ETYPE_DES_CFB64_NONE,
- "des-cfb64-none",
- NULL,
- 1,
- 1,
- 0,
- &keytype_des,
- &checksum_none,
- NULL,
- F_PSEUDO,
- DES_CFB64_encrypt_null_ivec,
-};
-static struct encryption_type enctype_des_pcbc_none = {
- ETYPE_DES_PCBC_NONE,
- "des-pcbc-none",
- NULL,
- 8,
- 8,
- 0,
- &keytype_des,
- &checksum_none,
- NULL,
- F_PSEUDO,
- DES_PCBC_encrypt_key_ivec,
-};
-static unsigned des_ede3_cbc_num[] = { 1, 2, 840, 113549, 3, 7 };
-static heim_oid des_ede3_cbc_oid = kcrypto_oid_enc(des_ede3_cbc_num);
-static struct encryption_type enctype_des3_cbc_none_cms = {
- ETYPE_DES3_CBC_NONE_CMS,
- "des3-cbc-none-cms",
- &des_ede3_cbc_oid,
- 8,
- 8,
- 0,
- &keytype_des3_derived,
- &checksum_none,
- NULL,
- F_PSEUDO|F_PADCMS,
- DES3_CBC_encrypt,
-};
-static struct encryption_type enctype_des3_cbc_none = {
- ETYPE_DES3_CBC_NONE,
- "des3-cbc-none",
- NULL,
- 8,
- 8,
- 0,
- &keytype_des3_derived,
- &checksum_none,
- NULL,
- F_PSEUDO,
- DES3_CBC_encrypt,
-};
-static unsigned rc2CBC_num[] = { 1, 2, 840, 113549, 3, 2 };
-static heim_oid rc2CBC_oid = kcrypto_oid_enc(rc2CBC_num);
-static struct encryption_type enctype_rc2_cbc_none = {
- ETYPE_RC2_CBC_NONE,
- "rc2-cbc-none",
- &rc2CBC_oid,
- 8,
- 8,
- 0,
- &keytype_rc2,
- &checksum_none,
- NULL,
- F_PSEUDO|F_PADCMS,
- RC2_CBC_encrypt,
-};
-
-static struct encryption_type *etypes[] = {
- &enctype_null,
- &enctype_des_cbc_crc,
- &enctype_des_cbc_md4,
- &enctype_des_cbc_md5,
- &enctype_arcfour_hmac_md5,
- &enctype_des3_cbc_md5,
- &enctype_des3_cbc_sha1,
- &enctype_old_des3_cbc_sha1,
- &enctype_aes128_cts_hmac_sha1,
- &enctype_aes256_cts_hmac_sha1,
- &enctype_aes128_cbc_none,
- &enctype_aes192_cbc_none,
- &enctype_aes256_cbc_none,
- &enctype_des_cbc_none,
- &enctype_des_cfb64_none,
- &enctype_des_pcbc_none,
- &enctype_des3_cbc_none,
- &enctype_des3_cbc_none_cms,
- &enctype_rc2_cbc_none
-};
-
-static unsigned num_etypes = sizeof(etypes) / sizeof(etypes[0]);
-
-
-static struct encryption_type *
-_find_enctype(krb5_enctype type)
-{
- int i;
- for(i = 0; i < num_etypes; i++)
- if(etypes[i]->type == type)
- return etypes[i];
- return NULL;
-}
-
+ cksum.checksum.data = p + len;
+ cksum.checksum.length = checksum_sz;
+ cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_enctype_to_string(krb5_context context,
- krb5_enctype etype,
- char **string)
-{
- struct encryption_type *e;
- e = _find_enctype(etype);
- if(e == NULL) {
- krb5_set_error_string (context, "encryption type %d not supported",
- etype);
- return KRB5_PROG_ETYPE_NOSUPP;
+ ret = verify_checksum(context,
+ crypto,
+ INTEGRITY_USAGE(usage),
+ p,
+ len,
+ &cksum);
+ if(ret) {
+ free(p);
+ return ret;
}
- *string = strdup(e->name);
- if(*string == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ l = len - et->confoundersize;
+ memmove(p, p + et->confoundersize, l);
+ result->data = realloc(p, l);
+ if(result->data == NULL && l != 0) {
+ free(p);
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
+ result->length = l;
return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_enctype(krb5_context context,
- const char *string,
- krb5_enctype *etype)
+static krb5_error_code
+decrypt_internal(krb5_context context,
+ krb5_crypto crypto,
+ void *data,
+ size_t len,
+ krb5_data *result,
+ void *ivec)
{
- int i;
- for(i = 0; i < num_etypes; i++)
- if(strcasecmp(etypes[i]->name, string) == 0){
- *etype = etypes[i]->type;
- return 0;
- }
- krb5_set_error_string (context, "encryption type %s not supported",
- string);
- return KRB5_PROG_ETYPE_NOSUPP;
-}
+ krb5_error_code ret;
+ unsigned char *p;
+ Checksum cksum;
+ size_t checksum_sz, l;
+ struct _krb5_encryption_type *et = crypto->et;
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_enctype_to_oid(krb5_context context,
- krb5_enctype etype,
- heim_oid *oid)
-{
- struct encryption_type *et = _find_enctype(etype);
- if(et == NULL) {
- krb5_set_error_string (context, "encryption type %d not supported",
- etype);
- return KRB5_PROG_ETYPE_NOSUPP;
+ if ((len % et->padsize) != 0) {
+ krb5_clear_error_message(context);
+ return KRB5_BAD_MSIZE;
}
- if(et->oid == NULL) {
- krb5_set_error_string (context, "%s have not oid", et->name);
- return KRB5_PROG_ETYPE_NOSUPP;
+ checksum_sz = CHECKSUMSIZE(et->checksum);
+ if (len < checksum_sz + et->confoundersize) {
+ krb5_set_error_message(context, KRB5_BAD_MSIZE,
+ N_("Encrypted data shorter then "
+ "checksum + confunder", ""));
+ return KRB5_BAD_MSIZE;
}
- krb5_clear_error_string(context);
- return copy_oid(et->oid, oid);
-}
-krb5_error_code KRB5_LIB_FUNCTION
-_krb5_oid_to_enctype(krb5_context context,
- const heim_oid *oid,
- krb5_enctype *etype)
-{
- int i;
- for(i = 0; i < num_etypes; i++) {
- if(etypes[i]->oid && heim_oid_cmp(etypes[i]->oid, oid) == 0) {
- *etype = etypes[i]->type;
- return 0;
- }
+ p = malloc(len);
+ if(len != 0 && p == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
}
- krb5_set_error_string(context, "enctype for oid not supported");
- return KRB5_PROG_ETYPE_NOSUPP;
-}
+ memcpy(p, data, len);
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_enctype_to_keytype(krb5_context context,
- krb5_enctype etype,
- krb5_keytype *keytype)
-{
- struct encryption_type *e = _find_enctype(etype);
- if(e == NULL) {
- krb5_set_error_string (context, "encryption type %d not supported",
- etype);
- return KRB5_PROG_ETYPE_NOSUPP;
+ ret = _key_schedule(context, &crypto->key);
+ if(ret) {
+ free(p);
+ return ret;
}
- *keytype = e->keytype->type; /* XXX */
- return 0;
-}
-
-#if 0
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_keytype_to_enctype(krb5_context context,
- krb5_keytype keytype,
- krb5_enctype *etype)
-{
- struct key_type *kt = _find_keytype(keytype);
- krb5_warnx(context, "krb5_keytype_to_enctype(%u)", keytype);
- if(kt == NULL)
- return KRB5_PROG_KEYTYPE_NOSUPP;
- *etype = kt->best_etype;
- return 0;
-}
-#endif
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_keytype_to_enctypes (krb5_context context,
- krb5_keytype keytype,
- unsigned *len,
- krb5_enctype **val)
-{
- int i;
- unsigned n = 0;
- krb5_enctype *ret;
-
- for (i = num_etypes - 1; i >= 0; --i) {
- if (etypes[i]->keytype->type == keytype
- && !(etypes[i]->flags & F_PSEUDO))
- ++n;
+ ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
+ if (ret) {
+ free(p);
+ return ret;
}
- ret = malloc(n * sizeof(*ret));
- if (ret == NULL && n != 0) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
+ if(ret) {
+ free(p);
+ return ret;
}
- n = 0;
- for (i = num_etypes - 1; i >= 0; --i) {
- if (etypes[i]->keytype->type == keytype
- && !(etypes[i]->flags & F_PSEUDO))
- ret[n++] = etypes[i]->type;
+ memset(p + et->confoundersize, 0, checksum_sz);
+ cksum.cksumtype = CHECKSUMTYPE(et->checksum);
+ ret = verify_checksum(context, NULL, 0, p, len, &cksum);
+ free_Checksum(&cksum);
+ if(ret) {
+ free(p);
+ return ret;
}
- *len = n;
- *val = ret;
+ l = len - et->confoundersize - checksum_sz;
+ memmove(p, p + et->confoundersize + checksum_sz, l);
+ result->data = realloc(p, l);
+ if(result->data == NULL && l != 0) {
+ free(p);
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
+ }
+ result->length = l;
return 0;
}
-/*
- * First take the configured list of etypes for `keytype' if available,
- * else, do `krb5_keytype_to_enctypes'.
- */
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_keytype_to_enctypes_default (krb5_context context,
- krb5_keytype keytype,
- unsigned *len,
- krb5_enctype **val)
+static krb5_error_code
+decrypt_internal_special(krb5_context context,
+ krb5_crypto crypto,
+ int usage,
+ void *data,
+ size_t len,
+ krb5_data *result,
+ void *ivec)
{
- int i, n;
- krb5_enctype *ret;
+ struct _krb5_encryption_type *et = crypto->et;
+ size_t cksum_sz = CHECKSUMSIZE(et->checksum);
+ size_t sz = len - cksum_sz - et->confoundersize;
+ unsigned char *p;
+ krb5_error_code ret;
- if (keytype != KEYTYPE_DES || context->etypes_des == NULL)
- return krb5_keytype_to_enctypes (context, keytype, len, val);
+ if ((len % et->padsize) != 0) {
+ krb5_clear_error_message(context);
+ return KRB5_BAD_MSIZE;
+ }
+ if (len < cksum_sz + et->confoundersize) {
+ krb5_set_error_message(context, KRB5_BAD_MSIZE,
+ N_("Encrypted data shorter then "
+ "checksum + confunder", ""));
+ return KRB5_BAD_MSIZE;
+ }
- for (n = 0; context->etypes_des[n]; ++n)
- ;
- ret = malloc (n * sizeof(*ret));
- if (ret == NULL && n != 0) {
- krb5_set_error_string(context, "malloc: out of memory");
+ p = malloc (len);
+ if (p == NULL) {
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
- for (i = 0; i < n; ++i)
- ret[i] = context->etypes_des[i];
- *len = n;
- *val = ret;
- return 0;
-}
+ memcpy(p, data, len);
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_enctype_valid(krb5_context context,
- krb5_enctype etype)
-{
- struct encryption_type *e = _find_enctype(etype);
- if(e == NULL) {
- krb5_set_error_string (context, "encryption type %d not supported",
- etype);
- return KRB5_PROG_ETYPE_NOSUPP;
- }
- if (e->flags & F_DISABLED) {
- krb5_set_error_string (context, "encryption type %s is disabled",
- e->name);
- return KRB5_PROG_ETYPE_NOSUPP;
+ ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
+ if (ret) {
+ free(p);
+ return ret;
}
- return 0;
-}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_cksumtype_valid(krb5_context context,
- krb5_cksumtype ctype)
-{
- struct checksum_type *c = _find_checksum(ctype);
- if (c == NULL) {
- krb5_set_error_string (context, "checksum type %d not supported",
- ctype);
- return KRB5_PROG_SUMTYPE_NOSUPP;
- }
- if (c->flags & F_DISABLED) {
- krb5_set_error_string (context, "checksum type %s is disabled",
- c->name);
- return KRB5_PROG_SUMTYPE_NOSUPP;
+ memmove (p, p + cksum_sz + et->confoundersize, sz);
+ result->data = realloc(p, sz);
+ if(result->data == NULL && sz != 0) {
+ free(p);
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
+ return ENOMEM;
}
+ result->length = sz;
return 0;
}
-
-/* if two enctypes have compatible keys */
-krb5_boolean KRB5_LIB_FUNCTION
-krb5_enctypes_compatible_keys(krb5_context context,
- krb5_enctype etype1,
- krb5_enctype etype2)
-{
- struct encryption_type *e1 = _find_enctype(etype1);
- struct encryption_type *e2 = _find_enctype(etype2);
- return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
-}
-
-static krb5_boolean
-derived_crypto(krb5_context context,
- krb5_crypto crypto)
-{
- return (crypto->et->flags & F_DERIVED) != 0;
-}
-
-static krb5_boolean
-special_crypto(krb5_context context,
- krb5_crypto crypto)
+static krb5_crypto_iov *
+find_iv(krb5_crypto_iov *data, size_t num_data, unsigned type)
{
- return (crypto->et->flags & F_SPECIAL) != 0;
+ size_t i;
+ for (i = 0; i < num_data; i++)
+ if (data[i].flags == type)
+ return &data[i];
+ return NULL;
}
-#define CHECKSUMSIZE(C) ((C)->checksumsize)
-#define CHECKSUMTYPE(C) ((C)->type)
+/**
+ * Inline encrypt a kerberos message
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param ivec initial cbc/cts vector
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ *
+ * Kerberos encrypted data look like this:
+ *
+ * 1. KRB5_CRYPTO_TYPE_HEADER
+ * 2. array [1,...] KRB5_CRYPTO_TYPE_DATA and array [0,...]
+ * KRB5_CRYPTO_TYPE_SIGN_ONLY in any order, however the receiver
+ * have to aware of the order. KRB5_CRYPTO_TYPE_SIGN_ONLY is
+ * commonly used headers and trailers.
+ * 3. KRB5_CRYPTO_TYPE_PADDING, at least on padsize long if padsize > 1
+ * 4. KRB5_CRYPTO_TYPE_TRAILER
+ */
-static krb5_error_code
-encrypt_internal_derived(krb5_context context,
- krb5_crypto crypto,
- unsigned usage,
- const void *data,
- size_t len,
- krb5_data *result,
- void *ivec)
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_encrypt_iov_ivec(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage,
+ krb5_crypto_iov *data,
+ int num_data,
+ void *ivec)
{
- size_t sz, block_sz, checksum_sz, total_sz;
+ size_t headersz, trailersz, len;
+ int i;
+ size_t sz, block_sz, pad_sz;
Checksum cksum;
unsigned char *p, *q;
krb5_error_code ret;
- struct key_data *dkey;
- const struct encryption_type *et = crypto->et;
-
- checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
+ struct _krb5_key_data *dkey;
+ const struct _krb5_encryption_type *et = crypto->et;
+ krb5_crypto_iov *tiv, *piv, *hiv;
- sz = et->confoundersize + len;
- block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
- total_sz = block_sz + checksum_sz;
- p = calloc(1, total_sz);
- if(p == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ if (num_data < 0) {
+ krb5_clear_error_message(context);
+ return KRB5_CRYPTO_INTERNAL;
}
-
- q = p;
- krb5_generate_random_block(q, et->confoundersize); /* XXX */
- q += et->confoundersize;
- memcpy(q, data, len);
-
- ret = create_checksum(context,
- et->keyed_checksum,
- crypto,
- INTEGRITY_USAGE(usage),
- p,
- block_sz,
- &cksum);
- if(ret == 0 && cksum.checksum.length != checksum_sz) {
- free_Checksum (&cksum);
- krb5_clear_error_string (context);
- ret = KRB5_CRYPTO_INTERNAL;
+
+ if(!derived_crypto(context, crypto)) {
+ krb5_clear_error_message(context);
+ return KRB5_CRYPTO_INTERNAL;
}
- if(ret)
- goto fail;
- memcpy(p + block_sz, cksum.checksum.data, cksum.checksum.length);
- free_Checksum (&cksum);
- ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
- if(ret)
- goto fail;
- ret = _key_schedule(context, dkey, crypto->params);
- if(ret)
- goto fail;
-#ifdef CRYPTO_DEBUG
- krb5_crypto_debug(context, 1, block_sz, dkey->key);
-#endif
- ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
- if (ret)
- goto fail;
- result->data = p;
- result->length = total_sz;
- return 0;
- fail:
- memset(p, 0, total_sz);
- free(p);
- return ret;
-}
+ headersz = et->confoundersize;
+ trailersz = CHECKSUMSIZE(et->keyed_checksum);
-static krb5_error_code
-encrypt_internal(krb5_context context,
- krb5_crypto crypto,
- const void *data,
- size_t len,
- krb5_data *result,
- void *ivec)
-{
- size_t sz, block_sz, checksum_sz, padsize = 0;
- Checksum cksum;
- unsigned char *p, *q;
- krb5_error_code ret;
- const struct encryption_type *et = crypto->et;
-
- checksum_sz = CHECKSUMSIZE(et->checksum);
-
- sz = et->confoundersize + checksum_sz + len;
+ for (len = 0, i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+ continue;
+ len += data[i].data.length;
+ }
+
+ sz = headersz + len;
block_sz = (sz + et->padsize - 1) &~ (et->padsize - 1); /* pad */
- if ((et->flags & F_PADCMS) && et->padsize != 1) {
- padsize = et->padsize - (sz % et->padsize);
- if (padsize == et->padsize)
- block_sz += et->padsize;
+
+ pad_sz = block_sz - sz;
+
+ /* header */
+
+ hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+ if (hiv == NULL || hiv->data.length != headersz)
+ return KRB5_BAD_MSIZE;
+
+ krb5_generate_random_block(hiv->data.data, hiv->data.length);
+
+ /* padding */
+ piv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_PADDING);
+ /* its ok to have no TYPE_PADDING if there is no padding */
+ if (piv == NULL && pad_sz != 0)
+ return KRB5_BAD_MSIZE;
+ if (piv) {
+ if (piv->data.length < pad_sz)
+ return KRB5_BAD_MSIZE;
+ piv->data.length = pad_sz;
+ if (pad_sz)
+ memset(piv->data.data, pad_sz, pad_sz);
+ else
+ piv = NULL;
}
- p = calloc(1, block_sz);
- if(p == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+
+ /* trailer */
+ tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
+ if (tiv == NULL || tiv->data.length != trailersz)
+ return KRB5_BAD_MSIZE;
+
+ /*
+ * XXX replace with EVP_Sign? at least make create_checksum an iov
+ * function.
+ * XXX CTS EVP is broken, can't handle multi buffers :(
+ */
+
+ len = block_sz;
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ len += data[i].data.length;
}
-
- q = p;
- krb5_generate_random_block(q, et->confoundersize); /* XXX */
- q += et->confoundersize;
- memset(q, 0, checksum_sz);
- q += checksum_sz;
- memcpy(q, data, len);
- ret = create_checksum(context,
- et->checksum,
+ p = q = malloc(len);
+
+ memcpy(q, hiv->data.data, hiv->data.length);
+ q += hiv->data.length;
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
+ data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ memcpy(q, data[i].data.data, data[i].data.length);
+ q += data[i].data.length;
+ }
+ if (piv)
+ memset(q, 0, piv->data.length);
+
+ ret = create_checksum(context,
+ et->keyed_checksum,
crypto,
- 0,
- p,
- block_sz,
+ INTEGRITY_USAGE(usage),
+ p,
+ len,
&cksum);
- if(ret == 0 && cksum.checksum.length != checksum_sz) {
- krb5_clear_error_string (context);
- free_Checksum(&cksum);
+ free(p);
+ if(ret == 0 && cksum.checksum.length != trailersz) {
+ free_Checksum (&cksum);
+ krb5_clear_error_message (context);
ret = KRB5_CRYPTO_INTERNAL;
}
if(ret)
- goto fail;
- memcpy(p + et->confoundersize, cksum.checksum.data, cksum.checksum.length);
- free_Checksum(&cksum);
- ret = _key_schedule(context, &crypto->key, crypto->params);
- if(ret)
- goto fail;
- if (et->flags & F_PADCMS) {
- int i;
- q = p + len + checksum_sz + et->confoundersize;
- for (i = 0; i < padsize; i++)
- q[i] = padsize;
- }
-#ifdef CRYPTO_DEBUG
- krb5_crypto_debug(context, 1, block_sz, crypto->key.key);
-#endif
- ret = (*et->encrypt)(context, &crypto->key, p, block_sz, 1, 0, ivec);
- if (ret) {
- memset(p, 0, block_sz);
- free(p);
return ret;
- }
- result->data = p;
- result->length = block_sz;
- return 0;
- fail:
- memset(p, 0, block_sz);
- free(p);
- return ret;
-}
-static krb5_error_code
-encrypt_internal_special(krb5_context context,
- krb5_crypto crypto,
- int usage,
- const void *data,
- size_t len,
- krb5_data *result,
- void *ivec)
-{
- struct encryption_type *et = crypto->et;
- size_t cksum_sz = CHECKSUMSIZE(et->checksum);
- size_t sz = len + cksum_sz + et->confoundersize;
- char *tmp, *p;
- krb5_error_code ret;
+ /* save cksum at end */
+ memcpy(tiv->data.data, cksum.checksum.data, cksum.checksum.length);
+ free_Checksum (&cksum);
- tmp = malloc (sz);
- if (tmp == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ /* XXX replace with EVP_Cipher */
+ p = q = malloc(block_sz);
+ if(p == NULL)
return ENOMEM;
+
+ memcpy(q, hiv->data.data, hiv->data.length);
+ q += hiv->data.length;
+
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+ continue;
+ memcpy(q, data[i].data.data, data[i].data.length);
+ q += data[i].data.length;
+ }
+ if (piv)
+ memset(q, 0, piv->data.length);
+
+
+ ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
+ if(ret) {
+ free(p);
+ return ret;
}
- p = tmp;
- memset (p, 0, cksum_sz);
- p += cksum_sz;
- krb5_generate_random_block(p, et->confoundersize);
- p += et->confoundersize;
- memcpy (p, data, len);
- ret = (*et->encrypt)(context, &crypto->key, tmp, sz, TRUE, usage, ivec);
+ ret = _key_schedule(context, dkey);
+ if(ret) {
+ free(p);
+ return ret;
+ }
+
+ ret = (*et->encrypt)(context, dkey, p, block_sz, 1, usage, ivec);
if (ret) {
- memset(tmp, 0, sz);
- free(tmp);
+ free(p);
return ret;
}
- result->data = tmp;
- result->length = sz;
- return 0;
+
+ /* now copy data back to buffers */
+ q = p;
+
+ memcpy(hiv->data.data, q, hiv->data.length);
+ q += hiv->data.length;
+
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+ continue;
+ memcpy(data[i].data.data, q, data[i].data.length);
+ q += data[i].data.length;
+ }
+ if (piv)
+ memcpy(piv->data.data, q, pad_sz);
+
+ free(p);
+
+ return ret;
}
-static krb5_error_code
-decrypt_internal_derived(krb5_context context,
- krb5_crypto crypto,
- unsigned usage,
- void *data,
- size_t len,
- krb5_data *result,
- void *ivec)
+/**
+ * Inline decrypt a Kerberos message.
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param ivec initial cbc/cts vector
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ *
+ * 1. KRB5_CRYPTO_TYPE_HEADER
+ * 2. one KRB5_CRYPTO_TYPE_DATA and array [0,...] of KRB5_CRYPTO_TYPE_SIGN_ONLY in
+ * any order, however the receiver have to aware of the
+ * order. KRB5_CRYPTO_TYPE_SIGN_ONLY is commonly used unencrypoted
+ * protocol headers and trailers. The output data will be of same
+ * size as the input data or shorter.
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_decrypt_iov_ivec(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage,
+ krb5_crypto_iov *data,
+ unsigned int num_data,
+ void *ivec)
{
- size_t checksum_sz;
+ unsigned int i;
+ size_t headersz, trailersz, len;
Checksum cksum;
- unsigned char *p;
+ unsigned char *p, *q;
krb5_error_code ret;
- struct key_data *dkey;
- struct encryption_type *et = crypto->et;
- unsigned long l;
-
- checksum_sz = CHECKSUMSIZE(et->keyed_checksum);
- if (len < checksum_sz) {
- krb5_clear_error_string (context);
- return EINVAL; /* XXX - better error code? */
+ struct _krb5_key_data *dkey;
+ struct _krb5_encryption_type *et = crypto->et;
+ krb5_crypto_iov *tiv, *hiv;
+
+ if(!derived_crypto(context, crypto)) {
+ krb5_clear_error_message(context);
+ return KRB5_CRYPTO_INTERNAL;
}
- if (((len - checksum_sz) % et->padsize) != 0) {
- krb5_clear_error_string(context);
+ headersz = et->confoundersize;
+
+ hiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_HEADER);
+ if (hiv == NULL || hiv->data.length != headersz)
+ return KRB5_BAD_MSIZE;
+
+ /* trailer */
+ trailersz = CHECKSUMSIZE(et->keyed_checksum);
+
+ tiv = find_iv(data, num_data, KRB5_CRYPTO_TYPE_TRAILER);
+ if (tiv->data.length != trailersz)
return KRB5_BAD_MSIZE;
+
+ /* Find length of data we will decrypt */
+
+ len = headersz;
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+ continue;
+ len += data[i].data.length;
}
- p = malloc(len);
- if(len != 0 && p == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ if ((len % et->padsize) != 0) {
+ krb5_clear_error_message(context);
+ return KRB5_BAD_MSIZE;
}
- memcpy(p, data, len);
- len -= checksum_sz;
+ /* XXX replace with EVP_Cipher */
+
+ p = q = malloc(len);
+ if (p == NULL)
+ return ENOMEM;
+
+ memcpy(q, hiv->data.data, hiv->data.length);
+ q += hiv->data.length;
+
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+ continue;
+ memcpy(q, data[i].data.data, data[i].data.length);
+ q += data[i].data.length;
+ }
ret = _get_derived_key(context, crypto, ENCRYPTION_USAGE(usage), &dkey);
if(ret) {
free(p);
return ret;
}
- ret = _key_schedule(context, dkey, crypto->params);
+ ret = _key_schedule(context, dkey);
if(ret) {
free(p);
return ret;
}
-#ifdef CRYPTO_DEBUG
- krb5_crypto_debug(context, 0, len, dkey->key);
-#endif
+
ret = (*et->encrypt)(context, dkey, p, len, 0, usage, ivec);
if (ret) {
free(p);
return ret;
}
- cksum.checksum.data = p + len;
- cksum.checksum.length = checksum_sz;
+ /* copy data back to buffers */
+ memcpy(hiv->data.data, p, hiv->data.length);
+ q = p + hiv->data.length;
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA)
+ continue;
+ memcpy(data[i].data.data, q, data[i].data.length);
+ q += data[i].data.length;
+ }
+
+ free(p);
+
+ /* check signature */
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ len += data[i].data.length;
+ }
+
+ p = q = malloc(len);
+ if (p == NULL)
+ return ENOMEM;
+
+ memcpy(q, hiv->data.data, hiv->data.length);
+ q += hiv->data.length;
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
+ data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ memcpy(q, data[i].data.data, data[i].data.length);
+ q += data[i].data.length;
+ }
+
+ cksum.checksum.data = tiv->data.data;
+ cksum.checksum.length = tiv->data.length;
cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
ret = verify_checksum(context,
p,
len,
&cksum);
- if(ret) {
- free(p);
- return ret;
- }
- l = len - et->confoundersize;
- memmove(p, p + et->confoundersize, l);
- result->data = realloc(p, l);
- if(result->data == NULL) {
- free(p);
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
- }
- result->length = l;
- return 0;
+ free(p);
+ return ret;
}
-static krb5_error_code
-decrypt_internal(krb5_context context,
- krb5_crypto crypto,
- void *data,
- size_t len,
- krb5_data *result,
- void *ivec)
+/**
+ * Create a Kerberos message checksum.
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param type output data
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_create_checksum_iov(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage,
+ krb5_crypto_iov *data,
+ unsigned int num_data,
+ krb5_cksumtype *type)
{
- krb5_error_code ret;
- unsigned char *p;
Checksum cksum;
- size_t checksum_sz, l;
- struct encryption_type *et = crypto->et;
-
- if ((len % et->padsize) != 0) {
- krb5_clear_error_string(context);
- return KRB5_BAD_MSIZE;
+ krb5_crypto_iov *civ;
+ krb5_error_code ret;
+ size_t i;
+ size_t len;
+ char *p, *q;
+
+ if(!derived_crypto(context, crypto)) {
+ krb5_clear_error_message(context);
+ return KRB5_CRYPTO_INTERNAL;
}
- checksum_sz = CHECKSUMSIZE(et->checksum);
- p = malloc(len);
- if(len != 0 && p == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
+ if (civ == NULL)
+ return KRB5_BAD_MSIZE;
+
+ len = 0;
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
+ data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ len += data[i].data.length;
}
- memcpy(p, data, len);
-
- ret = _key_schedule(context, &crypto->key, crypto->params);
- if(ret) {
- free(p);
- return ret;
+
+ p = q = malloc(len);
+
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
+ data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ memcpy(q, data[i].data.data, data[i].data.length);
+ q += data[i].data.length;
}
-#ifdef CRYPTO_DEBUG
- krb5_crypto_debug(context, 0, len, crypto->key.key);
-#endif
- ret = (*et->encrypt)(context, &crypto->key, p, len, 0, 0, ivec);
- if (ret) {
- free(p);
+
+ ret = krb5_create_checksum(context, crypto, usage, 0, p, len, &cksum);
+ free(p);
+ if (ret)
return ret;
+
+ if (type)
+ *type = cksum.cksumtype;
+
+ if (cksum.checksum.length > civ->data.length) {
+ krb5_set_error_message(context, KRB5_BAD_MSIZE,
+ N_("Checksum larger then input buffer", ""));
+ free_Checksum(&cksum);
+ return KRB5_BAD_MSIZE;
}
- ret = krb5_data_copy(&cksum.checksum, p + et->confoundersize, checksum_sz);
- if(ret) {
- free(p);
- return ret;
- }
- memset(p + et->confoundersize, 0, checksum_sz);
- cksum.cksumtype = CHECKSUMTYPE(et->checksum);
- ret = verify_checksum(context, NULL, 0, p, len, &cksum);
+
+ civ->data.length = cksum.checksum.length;
+ memcpy(civ->data.data, cksum.checksum.data, civ->data.length);
free_Checksum(&cksum);
- if(ret) {
- free(p);
- return ret;
- }
- l = len - et->confoundersize - checksum_sz;
- memmove(p, p + et->confoundersize + checksum_sz, l);
- result->data = realloc(p, l);
- if(result->data == NULL) {
- free(p);
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
- }
- result->length = l;
+
return 0;
}
-static krb5_error_code
-decrypt_internal_special(krb5_context context,
+/**
+ * Verify a Kerberos message checksum.
+ *
+ * @param context Kerberos context
+ * @param crypto Kerberos crypto context
+ * @param usage Key usage for this buffer
+ * @param data array of buffers to process
+ * @param num_data length of array
+ * @param type return checksum type if not NULL
+ *
+ * @return Return an error code or 0.
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_verify_checksum_iov(krb5_context context,
krb5_crypto crypto,
- int usage,
- void *data,
- size_t len,
- krb5_data *result,
- void *ivec)
+ unsigned usage,
+ krb5_crypto_iov *data,
+ unsigned int num_data,
+ krb5_cksumtype *type)
{
- struct encryption_type *et = crypto->et;
- size_t cksum_sz = CHECKSUMSIZE(et->checksum);
- size_t sz = len - cksum_sz - et->confoundersize;
- unsigned char *p;
+ struct _krb5_encryption_type *et = crypto->et;
+ Checksum cksum;
+ krb5_crypto_iov *civ;
krb5_error_code ret;
+ size_t i;
+ size_t len;
+ char *p, *q;
- if ((len % et->padsize) != 0) {
- krb5_clear_error_string(context);
+ if(!derived_crypto(context, crypto)) {
+ krb5_clear_error_message(context);
+ return KRB5_CRYPTO_INTERNAL;
+ }
+
+ civ = find_iv(data, num_data, KRB5_CRYPTO_TYPE_CHECKSUM);
+ if (civ == NULL)
return KRB5_BAD_MSIZE;
+
+ len = 0;
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
+ data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ len += data[i].data.length;
}
- p = malloc (len);
- if (p == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ p = q = malloc(len);
+
+ for (i = 0; i < num_data; i++) {
+ if (data[i].flags != KRB5_CRYPTO_TYPE_DATA &&
+ data[i].flags != KRB5_CRYPTO_TYPE_SIGN_ONLY)
+ continue;
+ memcpy(q, data[i].data.data, data[i].data.length);
+ q += data[i].data.length;
}
- memcpy(p, data, len);
-
- ret = (*et->encrypt)(context, &crypto->key, p, len, FALSE, usage, ivec);
- if (ret) {
- free(p);
- return ret;
+
+ cksum.cksumtype = CHECKSUMTYPE(et->keyed_checksum);
+ cksum.checksum.length = civ->data.length;
+ cksum.checksum.data = civ->data.data;
+
+ ret = krb5_verify_checksum(context, crypto, usage, p, len, &cksum);
+ free(p);
+
+ if (ret == 0 && type)
+ *type = cksum.cksumtype;
+
+ return ret;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_length(krb5_context context,
+ krb5_crypto crypto,
+ int type,
+ size_t *len)
+{
+ if (!derived_crypto(context, crypto)) {
+ krb5_set_error_message(context, EINVAL, "not a derived crypto");
+ return EINVAL;
}
- memmove (p, p + cksum_sz + et->confoundersize, sz);
- result->data = realloc(p, sz);
- if(result->data == NULL) {
- free(p);
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ switch(type) {
+ case KRB5_CRYPTO_TYPE_EMPTY:
+ *len = 0;
+ return 0;
+ case KRB5_CRYPTO_TYPE_HEADER:
+ *len = crypto->et->blocksize;
+ return 0;
+ case KRB5_CRYPTO_TYPE_DATA:
+ case KRB5_CRYPTO_TYPE_SIGN_ONLY:
+ /* len must already been filled in */
+ return 0;
+ case KRB5_CRYPTO_TYPE_PADDING:
+ if (crypto->et->padsize > 1)
+ *len = crypto->et->padsize;
+ else
+ *len = 0;
+ return 0;
+ case KRB5_CRYPTO_TYPE_TRAILER:
+ *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
+ return 0;
+ case KRB5_CRYPTO_TYPE_CHECKSUM:
+ if (crypto->et->keyed_checksum)
+ *len = CHECKSUMSIZE(crypto->et->keyed_checksum);
+ else
+ *len = CHECKSUMSIZE(crypto->et->checksum);
+ return 0;
+ }
+ krb5_set_error_message(context, EINVAL,
+ "%d not a supported type", type);
+ return EINVAL;
+}
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_length_iov(krb5_context context,
+ krb5_crypto crypto,
+ krb5_crypto_iov *data,
+ unsigned int num_data)
+{
+ krb5_error_code ret;
+ size_t i;
+
+ for (i = 0; i < num_data; i++) {
+ ret = krb5_crypto_length(context, crypto,
+ data[i].flags,
+ &data[i].data.length);
+ if (ret)
+ return ret;
}
- result->length = sz;
return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_encrypt_ivec(krb5_context context,
krb5_crypto crypto,
unsigned usage,
void *ivec)
{
if(derived_crypto(context, crypto))
- return encrypt_internal_derived(context, crypto, usage,
+ return encrypt_internal_derived(context, crypto, usage,
data, len, result, ivec);
else if (special_crypto(context, crypto))
return encrypt_internal_special (context, crypto, usage,
return encrypt_internal(context, crypto, data, len, result, ivec);
}
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_encrypt(krb5_context context,
krb5_crypto crypto,
unsigned usage,
return krb5_encrypt_ivec(context, crypto, usage, data, len, result, NULL);
}
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_encrypt_EncryptedData(krb5_context context,
krb5_crypto crypto,
unsigned usage,
return krb5_encrypt(context, crypto, usage, data, len, &result->cipher);
}
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_decrypt_ivec(krb5_context context,
krb5_crypto crypto,
unsigned usage,
void *ivec)
{
if(derived_crypto(context, crypto))
- return decrypt_internal_derived(context, crypto, usage,
+ return decrypt_internal_derived(context, crypto, usage,
data, len, result, ivec);
else if (special_crypto (context, crypto))
return decrypt_internal_special(context, crypto, usage,
return decrypt_internal(context, crypto, data, len, result, ivec);
}
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_decrypt(krb5_context context,
krb5_crypto crypto,
unsigned usage,
NULL);
}
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_decrypt_EncryptedData(krb5_context context,
krb5_crypto crypto,
unsigned usage,
const EncryptedData *e,
krb5_data *result)
{
- return krb5_decrypt(context, crypto, usage,
- e->cipher.data, e->cipher.length, result);
-}
-
-/************************************************************
- * *
- ************************************************************/
-
-#ifdef HAVE_OPENSSL
-#include <openssl/rand.h>
-
-/* From openssl/crypto/rand/rand_lcl.h */
-#define ENTROPY_NEEDED 20
-static int
-seed_something(void)
-{
- char buf[1024], seedfile[256];
-
- /* If there is a seed file, load it. But such a file cannot be trusted,
- so use 0 for the entropy estimate */
- if (RAND_file_name(seedfile, sizeof(seedfile))) {
- int fd;
- fd = open(seedfile, O_RDONLY);
- if (fd >= 0) {
- ssize_t ret;
- ret = read(fd, buf, sizeof(buf));
- if (ret > 0)
- RAND_add(buf, ret, 0.0);
- close(fd);
- } else
- seedfile[0] = '\0';
- } else
- seedfile[0] = '\0';
-
- /* Calling RAND_status() will try to use /dev/urandom if it exists so
- we do not have to deal with it. */
- if (RAND_status() != 1) {
- krb5_context context;
- const char *p;
-
- /* Try using egd */
- if (!krb5_init_context(&context)) {
- p = krb5_config_get_string(context, NULL, "libdefaults",
- "egd_socket", NULL);
- if (p != NULL)
- RAND_egd_bytes(p, ENTROPY_NEEDED);
- krb5_free_context(context);
- }
- }
-
- if (RAND_status() == 1) {
- /* Update the seed file */
- if (seedfile[0])
- RAND_write_file(seedfile);
-
- return 0;
- } else
- return -1;
-}
-
-void KRB5_LIB_FUNCTION
-krb5_generate_random_block(void *buf, size_t len)
-{
- static int rng_initialized = 0;
-
- HEIMDAL_MUTEX_lock(&crypto_mutex);
- if (!rng_initialized) {
- if (seed_something())
- krb5_abortx(NULL, "Fatal: could not seed the random number generator");
-
- rng_initialized = 1;
- }
- HEIMDAL_MUTEX_unlock(&crypto_mutex);
- RAND_bytes(buf, len);
-}
-
-#else
-
-void KRB5_LIB_FUNCTION
-krb5_generate_random_block(void *buf, size_t len)
-{
- DES_cblock key, out;
- static DES_cblock counter;
- static DES_key_schedule schedule;
- int i;
- static int initialized = 0;
-
- HEIMDAL_MUTEX_lock(&crypto_mutex);
- if(!initialized) {
- DES_new_random_key(&key);
- DES_set_key(&key, &schedule);
- memset(&key, 0, sizeof(key));
- DES_new_random_key(&counter);
- initialized = 1;
- }
- HEIMDAL_MUTEX_unlock(&crypto_mutex);
- while(len > 0) {
- DES_ecb_encrypt(&counter, &out, &schedule, DES_ENCRYPT);
- for(i = 7; i >=0; i--)
- if(counter[i]++)
- break;
- memcpy(buf, out, min(len, sizeof(out)));
- len -= min(len, sizeof(out));
- buf = (char*)buf + sizeof(out);
- }
-}
-#endif
-
-static void
-DES3_postproc(krb5_context context,
- unsigned char *k, size_t len, struct key_data *key)
-{
- DES3_random_to_key(context, key->key, k, len);
-
- if (key->schedule) {
- krb5_free_data(context, key->schedule);
- key->schedule = NULL;
- }
+ return krb5_decrypt(context, crypto, usage,
+ e->cipher.data, e->cipher.length, result);
}
-static krb5_error_code
-derive_key(krb5_context context,
- struct encryption_type *et,
- struct key_data *key,
- const void *constant,
- size_t len)
+/************************************************************
+ * *
+ ************************************************************/
+
+krb5_error_code
+_krb5_derive_key(krb5_context context,
+ struct _krb5_encryption_type *et,
+ struct _krb5_key_data *key,
+ const void *constant,
+ size_t len)
{
- unsigned char *k;
+ unsigned char *k = NULL;
unsigned int nblocks = 0, i;
krb5_error_code ret = 0;
-
- struct key_type *kt = et->keytype;
- /* since RC2 is only the weird crypto alg with parameter and this
- * function not defined with work with RC2, this is ok */
- ret = _key_schedule(context, key, NULL);
+ struct _krb5_key_type *kt = et->keytype;
+
+ ret = _key_schedule(context, key);
if(ret)
return ret;
- if(et->blocksize * 8 < kt->bits ||
- len != et->blocksize) {
+ if(et->blocksize * 8 < kt->bits || len != et->blocksize) {
nblocks = (kt->bits + et->blocksize * 8 - 1) / (et->blocksize * 8);
k = malloc(nblocks * et->blocksize);
if(k == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ ret = ENOMEM;
+ krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
+ goto out;
+ }
+ ret = _krb5_n_fold(constant, len, k, et->blocksize);
+ if (ret) {
+ krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
+ goto out;
}
- _krb5_n_fold(constant, len, k, et->blocksize);
+
for(i = 0; i < nblocks; i++) {
if(i > 0)
- memcpy(k + i * et->blocksize,
+ memcpy(k + i * et->blocksize,
k + (i - 1) * et->blocksize,
et->blocksize);
(*et->encrypt)(context, key, k + i * et->blocksize, et->blocksize,
size_t res_len = (kt->bits + 7) / 8;
if(len != 0 && c == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ ret = ENOMEM;
+ krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
+ goto out;
}
memcpy(c, constant, len);
(*et->encrypt)(context, key, c, len, 1, 0, NULL);
k = malloc(res_len);
if(res_len != 0 && k == NULL) {
free(c);
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
+ ret = ENOMEM;
+ krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
+ goto out;
}
- _krb5_n_fold(c, len, k, res_len);
+ ret = _krb5_n_fold(c, len, k, res_len);
free(c);
+ if (ret) {
+ krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
+ goto out;
+ }
}
-
+
/* XXX keytype dependent post-processing */
switch(kt->type) {
- case KEYTYPE_DES3:
- DES3_postproc(context, k, nblocks * et->blocksize, key);
+ case KRB5_ENCTYPE_OLD_DES3_CBC_SHA1:
+ _krb5_DES3_random_to_key(context, key->key, k, nblocks * et->blocksize);
break;
- case KEYTYPE_AES128:
- case KEYTYPE_AES256:
+ case KRB5_ENCTYPE_AES128_CTS_HMAC_SHA1_96:
+ case KRB5_ENCTYPE_AES256_CTS_HMAC_SHA1_96:
memcpy(key->key->keyvalue.data, k, key->key->keyvalue.length);
break;
default:
- krb5_set_error_string(context,
- "derive_key() called with unknown keytype (%u)",
- kt->type);
ret = KRB5_CRYPTO_INTERNAL;
+ krb5_set_error_message(context, ret,
+ N_("derive_key() called with unknown keytype (%u)", ""),
+ kt->type);
break;
}
+ out:
if (key->schedule) {
- krb5_free_data(context, key->schedule);
+ free_key_schedule(context, key, et);
key->schedule = NULL;
}
- memset(k, 0, nblocks * et->blocksize);
- free(k);
+ if (k) {
+ memset(k, 0, nblocks * et->blocksize);
+ free(k);
+ }
return ret;
}
-static struct key_data *
+static struct _krb5_key_data *
_new_derived_key(krb5_crypto crypto, unsigned usage)
{
- struct key_usage *d = crypto->key_usage;
+ struct _krb5_key_usage *d = crypto->key_usage;
d = realloc(d, (crypto->num_key_usage + 1) * sizeof(*d));
if(d == NULL)
return NULL;
return &d->key;
}
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_derive_key(krb5_context context,
const krb5_keyblock *key,
krb5_enctype etype,
krb5_keyblock **derived_key)
{
krb5_error_code ret;
- struct encryption_type *et;
- struct key_data d;
+ struct _krb5_encryption_type *et;
+ struct _krb5_key_data d;
- et = _find_enctype (etype);
+ *derived_key = NULL;
+
+ et = _krb5_find_enctype (etype);
if (et == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- etype);
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ etype);
return KRB5_PROG_ETYPE_NOSUPP;
}
- ret = krb5_copy_keyblock(context, key, derived_key);
+ ret = krb5_copy_keyblock(context, key, &d.key);
if (ret)
return ret;
- d.key = *derived_key;
d.schedule = NULL;
- ret = derive_key(context, et, &d, constant, constant_len);
- if (ret)
- return ret;
- ret = krb5_copy_keyblock(context, d.key, derived_key);
+ ret = _krb5_derive_key(context, et, &d, constant, constant_len);
+ if (ret == 0)
+ ret = krb5_copy_keyblock(context, d.key, derived_key);
+ _krb5_free_key_data(context, &d, et);
return ret;
}
static krb5_error_code
-_get_derived_key(krb5_context context,
- krb5_crypto crypto,
- unsigned usage,
- struct key_data **key)
+_get_derived_key(krb5_context context,
+ krb5_crypto crypto,
+ unsigned usage,
+ struct _krb5_key_data **key)
{
int i;
- struct key_data *d;
+ struct _krb5_key_data *d;
unsigned char constant[5];
for(i = 0; i < crypto->num_key_usage; i++)
}
d = _new_derived_key(crypto, usage);
if(d == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
krb5_copy_keyblock(context, crypto->key.key, &d->key);
_krb5_put_int(constant, usage, 5);
- derive_key(context, crypto->et, d, constant, sizeof(constant));
+ _krb5_derive_key(context, crypto->et, d, constant, sizeof(constant));
*key = d;
return 0;
}
+/**
+ * Create a crypto context used for all encryption and signature
+ * operation. The encryption type to use is taken from the key, but
+ * can be overridden with the enctype parameter. This can be useful
+ * for encryptions types which is compatiable (DES for example).
+ *
+ * To free the crypto context, use krb5_crypto_destroy().
+ *
+ * @param context Kerberos context
+ * @param key the key block information with all key data
+ * @param etype the encryption type
+ * @param crypto the resulting crypto context
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_init(krb5_context context,
const krb5_keyblock *key,
krb5_enctype etype,
krb5_error_code ret;
ALLOC(*crypto, 1);
if(*crypto == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
if(etype == ETYPE_NULL)
etype = key->keytype;
- (*crypto)->et = _find_enctype(etype);
+ (*crypto)->et = _krb5_find_enctype(etype);
if((*crypto)->et == NULL || ((*crypto)->et->flags & F_DISABLED)) {
free(*crypto);
*crypto = NULL;
- krb5_set_error_string (context, "encryption type %d not supported",
- etype);
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ etype);
return KRB5_PROG_ETYPE_NOSUPP;
}
- if((*crypto)->et->keytype->minsize > key->keyvalue.length) {
+ if((*crypto)->et->keytype->size != key->keyvalue.length) {
free(*crypto);
*crypto = NULL;
- krb5_set_error_string (context, "encryption key has bad length");
+ krb5_set_error_message (context, KRB5_BAD_KEYSIZE,
+ "encryption key has bad length");
return KRB5_BAD_KEYSIZE;
}
ret = krb5_copy_keyblock(context, key, &(*crypto)->key.key);
(*crypto)->key.schedule = NULL;
(*crypto)->num_key_usage = 0;
(*crypto)->key_usage = NULL;
- (*crypto)->params = NULL;
return 0;
}
static void
-free_key_data(krb5_context context, struct key_data *key)
+free_key_schedule(krb5_context context,
+ struct _krb5_key_data *key,
+ struct _krb5_encryption_type *et)
+{
+ if (et->keytype->cleanup)
+ (*et->keytype->cleanup)(context, key);
+ memset(key->schedule->data, 0, key->schedule->length);
+ krb5_free_data(context, key->schedule);
+}
+
+void
+_krb5_free_key_data(krb5_context context, struct _krb5_key_data *key,
+ struct _krb5_encryption_type *et)
{
krb5_free_keyblock(context, key->key);
if(key->schedule) {
- memset(key->schedule->data, 0, key->schedule->length);
- krb5_free_data(context, key->schedule);
+ free_key_schedule(context, key, et);
+ key->schedule = NULL;
}
}
static void
-free_key_usage(krb5_context context, struct key_usage *ku)
+free_key_usage(krb5_context context, struct _krb5_key_usage *ku,
+ struct _krb5_encryption_type *et)
{
- free_key_data(context, &ku->key);
+ _krb5_free_key_data(context, &ku->key, et);
}
-krb5_error_code KRB5_LIB_FUNCTION
+/**
+ * Free a crypto context created by krb5_crypto_init().
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to free
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_destroy(krb5_context context,
krb5_crypto crypto)
{
int i;
-
+
for(i = 0; i < crypto->num_key_usage; i++)
- free_key_usage(context, &crypto->key_usage[i]);
+ free_key_usage(context, &crypto->key_usage[i], crypto->et);
free(crypto->key_usage);
- free_key_data(context, &crypto->key);
- free(crypto->params);
+ _krb5_free_key_data(context, &crypto->key, crypto->et);
free (crypto);
return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_crypto_get_params(krb5_context context,
- const krb5_crypto crypto,
- const krb5_data *params,
- krb5_data *ivec)
-{
- krb5_error_code (*gp)(krb5_context, const krb5_data *,void **,krb5_data *);
- krb5_error_code ret;
-
- gp = crypto->et->keytype->get_params;
- if (gp) {
- if (crypto->params) {
- krb5_set_error_string(context,
- "krb5_crypto_get_params called "
- "more than once");
- return KRB5_PROG_ETYPE_NOSUPP;
- }
- ret = (*gp)(context, params, &crypto->params, ivec);
- } else {
- size_t size;
- if (ivec == NULL)
- return 0;
- ret = decode_CBCParameter(params->data, params->length, ivec, &size);
- }
- if (ret)
- return ret;
- if (ivec->length < crypto->et->blocksize) {
- krb5_data_free(ivec);
- krb5_set_error_string(context, "%s IV of wrong size",
- crypto->et->name);
- return ASN1_PARSE_ERROR;
- }
- return 0;
-}
-
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_crypto_set_params(krb5_context context,
- const krb5_crypto crypto,
- const krb5_data *ivec,
- krb5_data *params)
-{
- krb5_error_code (*sp)(krb5_context, const void *,
- const krb5_data *, krb5_data *);
- krb5_error_code ret;
-
- sp = crypto->et->keytype->set_params;
- if (sp == NULL) {
- size_t size;
- if (ivec == NULL)
- return 0;
- ASN1_MALLOC_ENCODE(CBCParameter, params->data, params->length,
- ivec, &size, ret);
- if (ret)
- return ret;
- if (size != params->length)
- krb5_abortx(context, "Internal asn1 encoder failure");
- return 0;
- }
- if (crypto->params) {
- krb5_set_error_string(context,
- "krb5_crypto_set_params called "
- "more than once");
- return KRB5_PROG_ETYPE_NOSUPP;
- }
- return (*sp)(context, crypto->params, ivec, params);
-}
-
+/**
+ * Return the blocksize used algorithm referenced by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param blocksize the resulting blocksize
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
-krb5_error_code KRB5_LIB_FUNCTION
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getblocksize(krb5_context context,
krb5_crypto crypto,
size_t *blocksize)
return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
+/**
+ * Return the encryption type used by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param enctype the resulting encryption type
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getenctype(krb5_context context,
krb5_crypto crypto,
krb5_enctype *enctype)
{
*enctype = crypto->et->type;
- return 0;
+ return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
+/**
+ * Return the padding size used by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param padsize the return padding size
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getpadsize(krb5_context context,
krb5_crypto crypto,
- size_t *padsize)
+ size_t *padsize)
{
*padsize = crypto->et->padsize;
return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
+/**
+ * Return the confounder size used by the crypto context
+ *
+ * @param context Kerberos context
+ * @param crypto crypto context to query
+ * @param confoundersize the returned confounder size
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_crypto_getconfoundersize(krb5_context context,
krb5_crypto crypto,
size_t *confoundersize)
return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
+
+/**
+ * Disable encryption type
+ *
+ * @param context Kerberos 5 context
+ * @param enctype encryption type to disable
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_enctype_disable(krb5_context context,
krb5_enctype enctype)
{
- struct encryption_type *et = _find_enctype(enctype);
+ struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
if(et == NULL) {
if (context)
- krb5_set_error_string (context, "encryption type %d not supported",
- enctype);
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ enctype);
return KRB5_PROG_ETYPE_NOSUPP;
}
et->flags |= F_DISABLED;
return 0;
}
-krb5_error_code KRB5_LIB_FUNCTION
-krb5_string_to_key_derived(krb5_context context,
- const void *str,
- size_t len,
- krb5_enctype etype,
- krb5_keyblock *key)
-{
- struct encryption_type *et = _find_enctype(etype);
- krb5_error_code ret;
- struct key_data kd;
- size_t keylen = et->keytype->bits / 8;
- u_char *tmp;
+/**
+ * Enable encryption type
+ *
+ * @param context Kerberos 5 context
+ * @param enctype encryption type to enable
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_enctype_enable(krb5_context context,
+ krb5_enctype enctype)
+{
+ struct _krb5_encryption_type *et = _krb5_find_enctype(enctype);
if(et == NULL) {
- krb5_set_error_string (context, "encryption type %d not supported",
- etype);
+ if (context)
+ krb5_set_error_message (context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ enctype);
return KRB5_PROG_ETYPE_NOSUPP;
}
- ALLOC(kd.key, 1);
- if(kd.key == NULL) {
- krb5_set_error_string (context, "malloc: out of memory");
- return ENOMEM;
- }
- ret = krb5_data_alloc(&kd.key->keyvalue, et->keytype->size);
- if(ret) {
- free(kd.key);
- return ret;
- }
- kd.key->keytype = etype;
- tmp = malloc (keylen);
- if(tmp == NULL) {
- krb5_free_keyblock(context, kd.key);
- krb5_set_error_string (context, "malloc: out of memory");
- return ENOMEM;
- }
- _krb5_n_fold(str, len, tmp, keylen);
- kd.schedule = NULL;
- DES3_postproc (context, tmp, keylen, &kd); /* XXX */
- memset(tmp, 0, keylen);
- free(tmp);
- ret = derive_key(context,
- et,
- &kd,
- "kerberos", /* XXX well known constant */
- strlen("kerberos"));
- ret = krb5_copy_keyblock_contents(context, kd.key, key);
- free_key_data(context, &kd);
- return ret;
+ et->flags &= ~F_DISABLED;
+ return 0;
+}
+
+/**
+ * Enable or disable all weak encryption types
+ *
+ * @param context Kerberos 5 context
+ * @param enable true to enable, false to disable
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_allow_weak_crypto(krb5_context context,
+ krb5_boolean enable)
+{
+ int i;
+
+ for(i = 0; i < _krb5_num_etypes; i++)
+ if(_krb5_etypes[i]->flags & F_WEAK) {
+ if(enable)
+ _krb5_etypes[i]->flags &= ~F_DISABLED;
+ else
+ _krb5_etypes[i]->flags |= F_DISABLED;
+ }
+ return 0;
}
static size_t
krb5_crypto crypto,
size_t data_len)
{
- struct encryption_type *et = crypto->et;
+ struct _krb5_encryption_type *et = crypto->et;
size_t padsize = et->padsize;
size_t checksumsize = CHECKSUMSIZE(et->checksum);
size_t res;
krb5_crypto crypto,
size_t data_len)
{
- struct encryption_type *et = crypto->et;
+ struct _krb5_encryption_type *et = crypto->et;
size_t padsize = et->padsize;
size_t res;
* Return the size of an encrypted packet of length `data_len'
*/
-size_t
+KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
krb5_get_wrapped_length (krb5_context context,
krb5_crypto crypto,
size_t data_len)
return wrapped_length (context, crypto, data_len);
}
-krb5_error_code KRB5_LIB_FUNCTION
+/*
+ * Return the size of an encrypted packet of length `data_len'
+ */
+
+static size_t
+crypto_overhead (krb5_context context,
+ krb5_crypto crypto)
+{
+ struct _krb5_encryption_type *et = crypto->et;
+ size_t res;
+
+ res = CHECKSUMSIZE(et->checksum);
+ res += et->confoundersize;
+ if (et->padsize > 1)
+ res += et->padsize;
+ return res;
+}
+
+static size_t
+crypto_overhead_dervied (krb5_context context,
+ krb5_crypto crypto)
+{
+ struct _krb5_encryption_type *et = crypto->et;
+ size_t res;
+
+ if (et->keyed_checksum)
+ res = CHECKSUMSIZE(et->keyed_checksum);
+ else
+ res = CHECKSUMSIZE(et->checksum);
+ res += et->confoundersize;
+ if (et->padsize > 1)
+ res += et->padsize;
+ return res;
+}
+
+KRB5_LIB_FUNCTION size_t KRB5_LIB_CALL
+krb5_crypto_overhead (krb5_context context, krb5_crypto crypto)
+{
+ if (derived_crypto (context, crypto))
+ return crypto_overhead_dervied (context, crypto);
+ else
+ return crypto_overhead (context, crypto);
+}
+
+/**
+ * Converts the random bytestring to a protocol key according to
+ * Kerberos crypto frame work. It may be assumed that all the bits of
+ * the input string are equally random, even though the entropy
+ * present in the random source may be limited.
+ *
+ * @param context Kerberos 5 context
+ * @param type the enctype resulting key will be of
+ * @param data input random data to convert to a key
+ * @param size size of input random data, at least krb5_enctype_keysize() long
+ * @param key key, output key, free with krb5_free_keyblock_contents()
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
krb5_random_to_key(krb5_context context,
krb5_enctype type,
const void *data,
krb5_keyblock *key)
{
krb5_error_code ret;
- struct encryption_type *et = _find_enctype(type);
+ struct _krb5_encryption_type *et = _krb5_find_enctype(type);
if(et == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- type);
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ type);
return KRB5_PROG_ETYPE_NOSUPP;
}
if ((et->keytype->bits + 7) / 8 > size) {
- krb5_set_error_string(context, "encryption key %s needs %d bytes "
- "of random to make an encryption key out of it",
- et->name, (int)et->keytype->size);
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption key %s needs %d bytes "
+ "of random to make an encryption key "
+ "out of it", ""),
+ et->name, (int)et->keytype->size);
return KRB5_PROG_ETYPE_NOSUPP;
}
ret = krb5_data_alloc(&key->keyvalue, et->keytype->size);
- if(ret)
+ if(ret)
return ret;
key->keytype = type;
if (et->keytype->random_to_key)
return 0;
}
-krb5_error_code
-_krb5_pk_octetstring2key(krb5_context context,
- krb5_enctype type,
- const void *dhdata,
- size_t dhsize,
- const heim_octet_string *c_n,
- const heim_octet_string *k_n,
- krb5_keyblock *key)
+
+
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_prf_length(krb5_context context,
+ krb5_enctype type,
+ size_t *length)
{
- struct encryption_type *et = _find_enctype(type);
- krb5_error_code ret;
- size_t keylen, offset;
- void *keydata;
- unsigned char counter;
- unsigned char shaoutput[20];
+ struct _krb5_encryption_type *et = _krb5_find_enctype(type);
- if(et == NULL) {
- krb5_set_error_string(context, "encryption type %d not supported",
- type);
+ if(et == NULL || et->prf_length == 0) {
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ N_("encryption type %d not supported", ""),
+ type);
return KRB5_PROG_ETYPE_NOSUPP;
}
- keylen = (et->keytype->bits + 7) / 8;
-
- keydata = malloc(keylen);
- if (keydata == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
- return ENOMEM;
- }
- counter = 0;
- offset = 0;
- do {
- SHA_CTX m;
-
- SHA1_Init(&m);
- SHA1_Update(&m, &counter, 1);
- SHA1_Update(&m, dhdata, dhsize);
- if (c_n)
- SHA1_Update(&m, c_n->data, c_n->length);
- if (k_n)
- SHA1_Update(&m, k_n->data, k_n->length);
- SHA1_Final(shaoutput, &m);
-
- memcpy((unsigned char *)keydata + offset,
- shaoutput,
- min(keylen - offset, sizeof(shaoutput)));
-
- offset += sizeof(shaoutput);
- counter++;
- } while(offset < keylen);
- memset(shaoutput, 0, sizeof(shaoutput));
-
- ret = krb5_random_to_key(context, type, keydata, keylen, key);
- memset(keydata, 0, sizeof(keylen));
- free(keydata);
- return ret;
+ *length = et->prf_length;
+ return 0;
}
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_prf(krb5_context context,
+ const krb5_crypto crypto,
+ const krb5_data *input,
+ krb5_data *output)
+{
+ struct _krb5_encryption_type *et = crypto->et;
-#ifdef CRYPTO_DEBUG
+ krb5_data_zero(output);
-static krb5_error_code
-krb5_get_keyid(krb5_context context,
- krb5_keyblock *key,
- u_int32_t *keyid)
-{
- MD5_CTX md5;
- unsigned char tmp[16];
+ if(et->prf == NULL) {
+ krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
+ "kerberos prf for %s not supported",
+ et->name);
+ return KRB5_PROG_ETYPE_NOSUPP;
+ }
- MD5_Init (&md5);
- MD5_Update (&md5, key->keyvalue.data, key->keyvalue.length);
- MD5_Final (tmp, &md5);
- *keyid = (tmp[12] << 24) | (tmp[13] << 16) | (tmp[14] << 8) | tmp[15];
- return 0;
+ return (*et->prf)(context, crypto, input, output);
}
-static void
-krb5_crypto_debug(krb5_context context,
- int encryptp,
- size_t len,
- krb5_keyblock *key)
+static krb5_error_code
+krb5_crypto_prfplus(krb5_context context,
+ const krb5_crypto crypto,
+ const krb5_data *input,
+ size_t length,
+ krb5_data *output)
{
- u_int32_t keyid;
- char *kt;
- krb5_get_keyid(context, key, &keyid);
- krb5_enctype_to_string(context, key->keytype, &kt);
- krb5_warnx(context, "%s %lu bytes with key-id %#x (%s)",
- encryptp ? "encrypting" : "decrypting",
- (unsigned long)len,
- keyid,
- kt);
- free(kt);
+ krb5_error_code ret;
+ krb5_data input2;
+ unsigned char i = 1;
+ unsigned char *p;
+
+ krb5_data_zero(&input2);
+ krb5_data_zero(output);
+
+ krb5_clear_error_message(context);
+
+ ret = krb5_data_alloc(output, length);
+ if (ret) goto out;
+ ret = krb5_data_alloc(&input2, input->length + 1);
+ if (ret) goto out;
+
+ krb5_clear_error_message(context);
+
+ memcpy(((unsigned char *)input2.data) + 1, input->data, input->length);
+
+ p = output->data;
+
+ while (length) {
+ krb5_data block;
+
+ ((unsigned char *)input2.data)[0] = i++;
+
+ ret = krb5_crypto_prf(context, crypto, &input2, &block);
+ if (ret)
+ goto out;
+
+ if (block.length < length) {
+ memcpy(p, block.data, block.length);
+ length -= block.length;
+ } else {
+ memcpy(p, block.data, length);
+ length = 0;
+ }
+ p += block.length;
+ krb5_data_free(&block);
+ }
+
+ out:
+ krb5_data_free(&input2);
+ if (ret)
+ krb5_data_free(output);
+ return 0;
}
-#endif /* CRYPTO_DEBUG */
+/**
+ * The FX-CF2 key derivation function, used in FAST and preauth framework.
+ *
+ * @param context Kerberos 5 context
+ * @param crypto1 first key to combine
+ * @param crypto2 second key to combine
+ * @param pepper1 factor to combine with first key to garante uniqueness
+ * @param pepper2 factor to combine with second key to garante uniqueness
+ * @param enctype the encryption type of the resulting key
+ * @param res allocated key, free with krb5_free_keyblock_contents()
+ *
+ * @return Return an error code or 0.
+ *
+ * @ingroup krb5_crypto
+ */
-#if 0
-int
-main()
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_crypto_fx_cf2(krb5_context context,
+ const krb5_crypto crypto1,
+ const krb5_crypto crypto2,
+ krb5_data *pepper1,
+ krb5_data *pepper2,
+ krb5_enctype enctype,
+ krb5_keyblock *res)
{
-#if 0
- int i;
- krb5_context context;
- krb5_crypto crypto;
- struct key_data *d;
- krb5_keyblock key;
- char constant[4];
- unsigned usage = ENCRYPTION_USAGE(3);
krb5_error_code ret;
+ krb5_data os1, os2;
+ size_t i, keysize;
- ret = krb5_init_context(&context);
+ memset(res, 0, sizeof(*res));
+
+ ret = krb5_enctype_keysize(context, enctype, &keysize);
+ if (ret)
+ return ret;
+
+ ret = krb5_data_alloc(&res->keyvalue, keysize);
if (ret)
- errx (1, "krb5_init_context failed: %d", ret);
+ goto out;
+ ret = krb5_crypto_prfplus(context, crypto1, pepper1, keysize, &os1);
+ if (ret)
+ goto out;
+ ret = krb5_crypto_prfplus(context, crypto2, pepper2, keysize, &os2);
+ if (ret)
+ goto out;
- key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
- key.keyvalue.data = "\xb3\x85\x58\x94\xd9\xdc\x7c\xc8"
- "\x25\xe9\x85\xab\x3e\xb5\xfb\x0e"
- "\xc8\xdf\xab\x26\x86\x64\x15\x25";
- key.keyvalue.length = 24;
+ res->keytype = enctype;
+ {
+ unsigned char *p1 = os1.data, *p2 = os2.data, *p3 = res->keyvalue.data;
+ for (i = 0; i < keysize; i++)
+ p3[i] = p1[i] ^ p2[i];
+ }
+ out:
+ if (ret)
+ krb5_data_free(&res->keyvalue);
+ krb5_data_free(&os1);
+ krb5_data_free(&os2);
- krb5_crypto_init(context, &key, 0, &crypto);
+ return ret;
+}
- d = _new_derived_key(crypto, usage);
- if(d == NULL)
- return ENOMEM;
- krb5_copy_keyblock(context, crypto->key.key, &d->key);
- _krb5_put_int(constant, usage, 4);
- derive_key(context, crypto->et, d, constant, sizeof(constant));
- return 0;
-#else
- int i;
- krb5_context context;
- krb5_crypto crypto;
- struct key_data *d;
- krb5_keyblock key;
- krb5_error_code ret;
- Checksum res;
- char *data = "what do ya want for nothing?";
- ret = krb5_init_context(&context);
- if (ret)
- errx (1, "krb5_init_context failed: %d", ret);
+#ifndef HEIMDAL_SMALLER
- key.keytype = ETYPE_NEW_DES3_CBC_SHA1;
- key.keyvalue.data = "Jefe";
- /* "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"
- "\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b\x0b"; */
- key.keyvalue.length = 4;
+/**
+ * Deprecated: keytypes doesn't exists, they are really enctypes.
+ *
+ * @ingroup krb5_deprecated
+ */
- d = calloc(1, sizeof(*d));
+KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
+krb5_keytype_to_enctypes (krb5_context context,
+ krb5_keytype keytype,
+ unsigned *len,
+ krb5_enctype **val)
+ KRB5_DEPRECATED_FUNCTION("Use X instead")
+{
+ int i;
+ unsigned n = 0;
+ krb5_enctype *ret;
- d->key = &key;
- res.checksum.length = 20;
- res.checksum.data = malloc(res.checksum.length);
- SP_HMAC_SHA1_checksum(context, d, data, 28, &res);
+ for (i = _krb5_num_etypes - 1; i >= 0; --i) {
+ if (_krb5_etypes[i]->keytype->type == keytype
+ && !(_krb5_etypes[i]->flags & F_PSEUDO)
+ && krb5_enctype_valid(context, _krb5_etypes[i]->type) == 0)
+ ++n;
+ }
+ if (n == 0) {
+ krb5_set_error_message(context, KRB5_PROG_KEYTYPE_NOSUPP,
+ "Keytype have no mapping");
+ return KRB5_PROG_KEYTYPE_NOSUPP;
+ }
+ ret = malloc(n * sizeof(*ret));
+ if (ret == NULL && n != 0) {
+ krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
+ return ENOMEM;
+ }
+ n = 0;
+ for (i = _krb5_num_etypes - 1; i >= 0; --i) {
+ if (_krb5_etypes[i]->keytype->type == keytype
+ && !(_krb5_etypes[i]->flags & F_PSEUDO)
+ && krb5_enctype_valid(context, _krb5_etypes[i]->type) == 0)
+ ret[n++] = _krb5_etypes[i]->type;
+ }
+ *len = n;
+ *val = ret;
return 0;
-#endif
}
-#endif
+
+/**
+ * Deprecated: keytypes doesn't exists, they are really enctypes.
+ *
+ * @ingroup krb5_deprecated
+ */
+
+/* if two enctypes have compatible keys */
+KRB5_LIB_FUNCTION krb5_boolean KRB5_LIB_CALL
+krb5_enctypes_compatible_keys(krb5_context context,
+ krb5_enctype etype1,
+ krb5_enctype etype2)
+ KRB5_DEPRECATED_FUNCTION("Use X instead")
+{
+ struct _krb5_encryption_type *e1 = _krb5_find_enctype(etype1);
+ struct _krb5_encryption_type *e2 = _krb5_find_enctype(etype2);
+ return e1 != NULL && e2 != NULL && e1->keytype == e2->keytype;
+}
+
+#endif /* HEIMDAL_SMALLER */
git.samba.org / sfrench / samba-autobuild / .git / blobdiff