/*
- * Copyright (c) 1997 - 2002 Kungliga Tekniska Högskolan
+ * Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
#include "krb5_locl.h"
-RCSID("$Id: get_in_tkt.c 20226 2007-02-16 03:31:50Z lha $");
+RCSID("$Id: get_in_tkt.c 23316 2008-06-23 04:32:32Z lha $");
krb5_error_code KRB5_LIB_FUNCTION
krb5_init_etype (krb5_context context,
krb5_enctype **val,
const krb5_enctype *etypes)
{
- int i;
+ unsigned int i;
krb5_error_code ret;
krb5_enctype *tmp = NULL;
*val = malloc(i * sizeof(**val));
if (i != 0 && *val == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto cleanup;
}
memmove (*val,
return ret;
}
+static krb5_error_code
+check_server_referral(krb5_context context,
+ krb5_kdc_rep *rep,
+ unsigned flags,
+ krb5_const_principal requested,
+ krb5_const_principal returned,
+ const krb5_keyblock const * key)
+{
+ krb5_error_code ret;
+ PA_ServerReferralData ref;
+ krb5_crypto session;
+ EncryptedData ed;
+ size_t len;
+ krb5_data data;
+ PA_DATA *pa;
+ int i = 0, cmp;
+
+ if (rep->kdc_rep.padata == NULL)
+ goto noreferral;
+
+ pa = krb5_find_padata(rep->kdc_rep.padata->val,
+ rep->kdc_rep.padata->len,
+ KRB5_PADATA_SERVER_REFERRAL, &i);
+ if (pa == NULL)
+ goto noreferral;
+
+ memset(&ed, 0, sizeof(ed));
+ memset(&ref, 0, sizeof(ref));
+
+ ret = decode_EncryptedData(pa->padata_value.data,
+ pa->padata_value.length,
+ &ed, &len);
+ if (ret)
+ return ret;
+ if (len != pa->padata_value.length) {
+ free_EncryptedData(&ed);
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED, "Referral EncryptedData wrong");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+
+ ret = krb5_crypto_init(context, key, 0, &session);
+ if (ret) {
+ free_EncryptedData(&ed);
+ return ret;
+ }
+
+ ret = krb5_decrypt_EncryptedData(context, session,
+ KRB5_KU_PA_SERVER_REFERRAL,
+ &ed, &data);
+ free_EncryptedData(&ed);
+ krb5_crypto_destroy(context, session);
+ if (ret)
+ return ret;
+
+ ret = decode_PA_ServerReferralData(data.data, data.length, &ref, &len);
+ if (ret) {
+ krb5_data_free(&data);
+ return ret;
+ }
+ krb5_data_free(&data);
+
+ if (strcmp(requested->realm, returned->realm) != 0) {
+ free_PA_ServerReferralData(&ref);
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
+ "server ref realm mismatch");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+
+ if (returned->name.name_string.len == 2 &&
+ strcmp(returned->name.name_string.val[0], KRB5_TGS_NAME) == 0)
+ {
+ const char *realm = returned->name.name_string.val[1];
+
+ if (ref.referred_realm == NULL
+ || strcmp(*ref.referred_realm, realm) != 0)
+ {
+ free_PA_ServerReferralData(&ref);
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
+ "tgt returned with wrong ref");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+ } else if (krb5_principal_compare(context, returned, requested) == 0) {
+ free_PA_ServerReferralData(&ref);
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
+ "req princ no same as returned");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+
+ if (ref.requested_principal_name) {
+ cmp = _krb5_principal_compare_PrincipalName(context,
+ requested,
+ ref.requested_principal_name);
+ if (!cmp) {
+ free_PA_ServerReferralData(&ref);
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
+ "compare requested failed");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+ } else if (flags & EXTRACT_TICKET_AS_REQ) {
+ free_PA_ServerReferralData(&ref);
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
+ "Requested principal missing on AS-REQ");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+
+ free_PA_ServerReferralData(&ref);
+
+ return ret;
+noreferral:
+ if (krb5_principal_compare(context, requested, returned) == FALSE) {
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
+ "Not same server principal returned "
+ "as requested");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+ return 0;
+}
+
+
+/*
+ * Verify referral data
+ */
+
+
+static krb5_error_code
+check_client_referral(krb5_context context,
+ krb5_kdc_rep *rep,
+ krb5_const_principal requested,
+ krb5_const_principal mapped,
+ krb5_keyblock const * key)
+{
+ krb5_error_code ret;
+ PA_ClientCanonicalized canon;
+ krb5_crypto crypto;
+ krb5_data data;
+ PA_DATA *pa;
+ size_t len;
+ int i = 0;
+
+ if (rep->kdc_rep.padata == NULL)
+ goto noreferral;
+
+ pa = krb5_find_padata(rep->kdc_rep.padata->val,
+ rep->kdc_rep.padata->len,
+ KRB5_PADATA_CLIENT_CANONICALIZED, &i);
+ if (pa == NULL)
+ goto noreferral;
+
+ ret = decode_PA_ClientCanonicalized(pa->padata_value.data,
+ pa->padata_value.length,
+ &canon, &len);
+ if (ret) {
+ krb5_set_error_message(context, ret, "Failed to decode "
+ "PA_ClientCanonicalized");
+ return ret;
+ }
+
+ ASN1_MALLOC_ENCODE(PA_ClientCanonicalizedNames, data.data, data.length,
+ &canon.names, &len, ret);
+ if (ret) {
+ free_PA_ClientCanonicalized(&canon);
+ return ret;
+ }
+ if (data.length != len)
+ krb5_abortx(context, "internal asn.1 error");
+
+ ret = krb5_crypto_init(context, key, 0, &crypto);
+ if (ret) {
+ free(data.data);
+ free_PA_ClientCanonicalized(&canon);
+ return ret;
+ }
+
+ ret = krb5_verify_checksum(context, crypto, KRB5_KU_CANONICALIZED_NAMES,
+ data.data, data.length,
+ &canon.canon_checksum);
+ krb5_crypto_destroy(context, crypto);
+ free(data.data);
+ if (ret) {
+ krb5_set_error_message(context, ret, "Failed to verify "
+ "client canonicalized data");
+ free_PA_ClientCanonicalized(&canon);
+ return ret;
+ }
+
+ if (!_krb5_principal_compare_PrincipalName(context,
+ requested,
+ &canon.names.requested_name))
+ {
+ free_PA_ClientCanonicalized(&canon);
+ krb5_set_error_message(context, KRB5_PRINC_NOMATCH,
+ "Requested name doesn't match"
+ " in client referral");
+ return KRB5_PRINC_NOMATCH;
+ }
+ if (!_krb5_principal_compare_PrincipalName(context,
+ mapped,
+ &canon.names.mapped_name))
+ {
+ free_PA_ClientCanonicalized(&canon);
+ krb5_set_error_message(context, KRB5_PRINC_NOMATCH,
+ "Mapped name doesn't match"
+ " in client referral");
+ return KRB5_PRINC_NOMATCH;
+ }
+
+ return 0;
+
+noreferral:
+ if (krb5_principal_compare(context, requested, mapped) == FALSE) {
+ krb5_set_error_message(context, KRB5KRB_AP_ERR_MODIFIED,
+ "Not same client principal returned "
+ "as requested");
+ return KRB5KRB_AP_ERR_MODIFIED;
+ }
+ return 0;
+}
+
+
static krb5_error_code
decrypt_tkt (krb5_context context,
}
int
-_krb5_extract_ticket(krb5_context context,
- krb5_kdc_rep *rep,
- krb5_creds *creds,
+_krb5_extract_ticket(krb5_context context,
+ krb5_kdc_rep *rep,
+ krb5_creds *creds,
krb5_keyblock *key,
krb5_const_pointer keyseed,
krb5_key_usage key_usage,
{
krb5_error_code ret;
krb5_principal tmp_principal;
- int tmp;
size_t len;
time_t tmp_time;
krb5_timestamp sec_now;
-/*
- * HACK:
- * this is really a ugly hack, to support using the Netbios Domain Name
- * as realm against windows KDC's, they always return the full realm
- * based on the DNS Name.
- */
-flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
-flags |=EXTRACT_TICKET_ALLOW_CNAME_MISMATCH ;
+ /* decrypt */
+
+ if (decrypt_proc == NULL)
+ decrypt_proc = decrypt_tkt;
+
+ ret = (*decrypt_proc)(context, key, key_usage, decryptarg, rep);
+ if (ret)
+ goto out;
+
+ /* save session key */
+
+ creds->session.keyvalue.length = 0;
+ creds->session.keyvalue.data = NULL;
+ creds->session.keytype = rep->enc_part.key.keytype;
+ ret = krb5_data_copy (&creds->session.keyvalue,
+ rep->enc_part.key.keyvalue.data,
+ rep->enc_part.key.keyvalue.length);
+ if (ret) {
+ krb5_clear_error_string(context);
+ goto out;
+ }
+
+ /*
+ * HACK:
+ * this is really a ugly hack, to support using the Netbios Domain Name
+ * as realm against windows KDC's, they always return the full realm
+ * based on the DNS Name.
+ */
+ flags |= EXTRACT_TICKET_ALLOW_SERVER_MISMATCH;
+ flags |=EXTRACT_TICKET_ALLOW_CNAME_MISMATCH ;
+
- ret = _krb5_principalname2krb5_principal (context,
+ /* compare client and save */
+ ret = _krb5_principalname2krb5_principal (context,
&tmp_principal,
rep->kdc_rep.cname,
rep->kdc_rep.crealm);
if (ret)
goto out;
- /* compare client */
-
- if((flags & EXTRACT_TICKET_ALLOW_CNAME_MISMATCH) == 0){
- tmp = krb5_principal_compare (context, tmp_principal, creds->client);
- if (!tmp) {
+ /* check client referral and save principal */
+ /* anonymous here ? */
+ if((flags & EXTRACT_TICKET_ALLOW_CNAME_MISMATCH) == 0) {
+ ret = check_client_referral(context, rep,
+ creds->client,
+ tmp_principal,
+ &creds->session);
+ if (ret) {
krb5_free_principal (context, tmp_principal);
- krb5_clear_error_string (context);
- ret = KRB5KRB_AP_ERR_MODIFIED;
goto out;
}
}
-
krb5_free_principal (context, creds->client);
creds->client = tmp_principal;
- /* extract ticket */
- ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
- &rep->kdc_rep.ticket, &len, ret);
- if(ret)
- goto out;
- if (creds->ticket.length != len)
- krb5_abortx(context, "internal error in ASN.1 encoder");
- creds->second_ticket.length = 0;
- creds->second_ticket.data = NULL;
-
- /* compare server */
-
+ /* check server referral and save principal */
ret = _krb5_principalname2krb5_principal (context,
&tmp_principal,
rep->kdc_rep.ticket.sname,
rep->kdc_rep.ticket.realm);
if (ret)
goto out;
- if(flags & EXTRACT_TICKET_ALLOW_SERVER_MISMATCH){
- krb5_free_principal(context, creds->server);
- creds->server = tmp_principal;
- tmp_principal = NULL;
- } else {
- tmp = krb5_principal_compare (context, tmp_principal,
- creds->server);
- krb5_free_principal (context, tmp_principal);
- if (!tmp) {
- ret = KRB5KRB_AP_ERR_MODIFIED;
- krb5_clear_error_string (context);
+ if((flags & EXTRACT_TICKET_ALLOW_SERVER_MISMATCH) == 0){
+ ret = check_server_referral(context,
+ rep,
+ flags,
+ creds->server,
+ tmp_principal,
+ &creds->session);
+ if (ret) {
+ krb5_free_principal (context, tmp_principal);
goto out;
}
}
-
- /* decrypt */
-
- if (decrypt_proc == NULL)
- decrypt_proc = decrypt_tkt;
-
- ret = (*decrypt_proc)(context, key, key_usage, decryptarg, rep);
- if (ret)
- goto out;
+ krb5_free_principal(context, creds->server);
+ creds->server = tmp_principal;
/* verify names */
if(flags & EXTRACT_TICKET_MATCH_REALM){
if (nonce != rep->enc_part.nonce) {
ret = KRB5KRB_AP_ERR_MODIFIED;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto out;
}
if (creds->times.starttime == 0
&& abs(tmp_time - sec_now) > context->max_skew) {
ret = KRB5KRB_AP_ERR_SKEW;
- krb5_set_error_string (context,
+ krb5_set_error_message (context, ret,
"time skew (%d) larger than max (%d)",
abs(tmp_time - sec_now),
(int)context->max_skew);
creds->authdata.len = 0;
creds->authdata.val = NULL;
- creds->session.keyvalue.length = 0;
- creds->session.keyvalue.data = NULL;
- creds->session.keytype = rep->enc_part.key.keytype;
- ret = krb5_data_copy (&creds->session.keyvalue,
- rep->enc_part.key.keyvalue.data,
- rep->enc_part.key.keyvalue.length);
+
+ /* extract ticket */
+ ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
+ &rep->kdc_rep.ticket, &len, ret);
+ if(ret)
+ goto out;
+ if (creds->ticket.length != len)
+ krb5_abortx(context, "internal error in ASN.1 encoder");
+ creds->second_ticket.length = 0;
+ creds->second_ticket.data = NULL;
+
out:
memset (rep->enc_part.key.keyvalue.data, 0,
}
pa2 = realloc (md->val, (md->len + netypes) * sizeof(*md->val));
if (pa2 == NULL) {
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ENOMEM, "malloc: out of memory");
return ENOMEM;
}
md->val = pa2;
a->req_body.cname = malloc(sizeof(*a->req_body.cname));
if (a->req_body.cname == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto fail;
}
a->req_body.sname = malloc(sizeof(*a->req_body.sname));
if (a->req_body.sname == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto fail;
}
ret = _krb5_principal2principalname (a->req_body.cname, creds->client);
a->req_body.from = malloc(sizeof(*a->req_body.from));
if (a->req_body.from == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto fail;
}
*a->req_body.from = creds->times.starttime;
a->req_body.rtime = malloc(sizeof(*a->req_body.rtime));
if (a->req_body.rtime == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto fail;
}
*a->req_body.rtime = creds->times.renew_till;
a->req_body.addresses = malloc(sizeof(*a->req_body.addresses));
if (a->req_body.addresses == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto fail;
}
ALLOC(a->padata, 1);
if(a->padata == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto fail;
}
a->padata->val = NULL;
ALLOC(a->padata, 1);
if (a->padata == NULL) {
ret = ENOMEM;
- krb5_set_error_string(context, "malloc: out of memory");
+ krb5_set_error_message(context, ret, "malloc: out of memory");
goto fail;
}
a->padata->len = 0;
key_proc, keyseed, a->req_body.etype.val,
a->req_body.etype.len, &salt);
} else {
- krb5_set_error_string (context, "pre-auth type %d not supported",
- *ptypes);
ret = KRB5_PREAUTH_BAD_TYPE;
+ krb5_set_error_message (context, ret, "pre-auth type %d not supported",
+ *ptypes);
goto fail;
}
return 0;
git.samba.org / tprouty / samba.git / blobdiff