2 * Copyright (c) 1997 - 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34 #include <krb5_locl.h>
36 static krb5_error_code
37 compare_addrs(krb5_context context,
42 char a_str[64], b_str[64];
45 if(krb5_address_compare (context, a, b))
48 krb5_print_address (a, a_str, sizeof(a_str), &len);
49 krb5_print_address (b, b_str, sizeof(b_str), &len);
50 krb5_set_error_message(context, KRB5KRB_AP_ERR_BADADDR,
51 "%s: %s != %s", message, b_str, a_str);
52 return KRB5KRB_AP_ERR_BADADDR;
55 krb5_error_code KRB5_LIB_FUNCTION
56 krb5_rd_cred(krb5_context context,
57 krb5_auth_context auth_context,
59 krb5_creds ***ret_creds,
60 krb5_replay_data *outdata)
65 EncKrbCredPart enc_krb_cred_part;
66 krb5_data enc_krb_cred_part_data;
70 memset(&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
72 if ((auth_context->flags &
73 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
75 return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
79 ret = decode_KRB_CRED(in_data->data, in_data->length,
82 krb5_clear_error_message(context);
87 ret = KRB5KRB_AP_ERR_BADVERSION;
88 krb5_clear_error_message (context);
92 if (cred.msg_type != krb_cred) {
93 ret = KRB5KRB_AP_ERR_MSG_TYPE;
94 krb5_clear_error_message (context);
98 if (cred.enc_part.etype == ETYPE_NULL) {
99 /* DK: MIT GSS-API Compatibility */
100 enc_krb_cred_part_data.length = cred.enc_part.cipher.length;
101 enc_krb_cred_part_data.data = cred.enc_part.cipher.data;
103 /* Try both subkey and session key.
105 * RFC4120 claims we should use the session key, but Heimdal
106 * before 0.8 used the remote subkey if it was send in the
110 if (auth_context->remote_subkey) {
111 ret = krb5_crypto_init(context, auth_context->remote_subkey,
116 ret = krb5_decrypt_EncryptedData(context,
120 &enc_krb_cred_part_data);
122 krb5_crypto_destroy(context, crypto);
126 * If there was not subkey, or we failed using subkey,
127 * retry using the session key
129 if (auth_context->remote_subkey == NULL || ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
132 ret = krb5_crypto_init(context, auth_context->keyblock,
138 ret = krb5_decrypt_EncryptedData(context,
142 &enc_krb_cred_part_data);
144 krb5_crypto_destroy(context, crypto);
150 ret = decode_EncKrbCredPart(enc_krb_cred_part_data.data,
151 enc_krb_cred_part_data.length,
154 if (enc_krb_cred_part_data.data != cred.enc_part.cipher.data)
155 krb5_data_free(&enc_krb_cred_part_data);
157 krb5_set_error_message(context, ret,
158 N_("Failed to decode "
159 "encrypte credential part", ""));
163 /* check sender address */
165 if (enc_krb_cred_part.s_address
166 && auth_context->remote_address
167 && auth_context->remote_port) {
170 ret = krb5_make_addrport (context, &a,
171 auth_context->remote_address,
172 auth_context->remote_port);
177 ret = compare_addrs(context, a, enc_krb_cred_part.s_address,
178 N_("sender address is wrong "
179 "in received creds", ""));
180 krb5_free_address(context, a);
186 /* check receiver address */
188 if (enc_krb_cred_part.r_address
189 && auth_context->local_address) {
190 if(auth_context->local_port &&
191 enc_krb_cred_part.r_address->addr_type == KRB5_ADDRESS_ADDRPORT) {
193 ret = krb5_make_addrport (context, &a,
194 auth_context->local_address,
195 auth_context->local_port);
199 ret = compare_addrs(context, a, enc_krb_cred_part.r_address,
200 N_("receiver address is wrong "
201 "in received creds", ""));
202 krb5_free_address(context, a);
207 ret = compare_addrs(context, auth_context->local_address,
208 enc_krb_cred_part.r_address,
209 N_("receiver address is wrong "
210 "in received creds", ""));
216 /* check timestamp */
217 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
220 krb5_timeofday (context, &sec);
222 if (enc_krb_cred_part.timestamp == NULL ||
223 enc_krb_cred_part.usec == NULL ||
224 abs(*enc_krb_cred_part.timestamp - sec)
225 > context->max_skew) {
226 krb5_clear_error_message (context);
227 ret = KRB5KRB_AP_ERR_SKEW;
232 if ((auth_context->flags &
233 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE))) {
234 /* if these fields are not present in the cred-part, silently
236 memset(outdata, 0, sizeof(*outdata));
237 if(enc_krb_cred_part.timestamp)
238 outdata->timestamp = *enc_krb_cred_part.timestamp;
239 if(enc_krb_cred_part.usec)
240 outdata->usec = *enc_krb_cred_part.usec;
241 if(enc_krb_cred_part.nonce)
242 outdata->seq = *enc_krb_cred_part.nonce;
245 /* Convert to NULL terminated list of creds */
247 *ret_creds = calloc(enc_krb_cred_part.ticket_info.len + 1,
248 sizeof(**ret_creds));
250 if (*ret_creds == NULL) {
252 krb5_set_error_message(context, ret,
253 N_("malloc: out of memory", ""));
257 for (i = 0; i < enc_krb_cred_part.ticket_info.len; ++i) {
258 KrbCredInfo *kci = &enc_krb_cred_part.ticket_info.val[i];
261 creds = calloc(1, sizeof(*creds));
264 krb5_set_error_message(context, ret,
265 N_("malloc: out of memory", ""));
269 ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
270 &cred.tickets.val[i], &len, ret);
275 if(creds->ticket.length != len)
276 krb5_abortx(context, "internal error in ASN.1 encoder");
277 copy_EncryptionKey (&kci->key, &creds->session);
278 if (kci->prealm && kci->pname)
279 _krb5_principalname2krb5_principal (context,
284 creds->flags.b = *kci->flags;
286 creds->times.authtime = *kci->authtime;
288 creds->times.starttime = *kci->starttime;
290 creds->times.endtime = *kci->endtime;
292 creds->times.renew_till = *kci->renew_till;
293 if (kci->srealm && kci->sname)
294 _krb5_principalname2krb5_principal (context,
299 krb5_copy_addresses (context,
303 (*ret_creds)[i] = creds;
306 (*ret_creds)[i] = NULL;
308 free_KRB_CRED (&cred);
309 free_EncKrbCredPart(&enc_krb_cred_part);
314 free_EncKrbCredPart(&enc_krb_cred_part);
315 free_KRB_CRED (&cred);
317 for(i = 0; (*ret_creds)[i]; i++)
318 krb5_free_creds(context, (*ret_creds)[i]);
325 krb5_error_code KRB5_LIB_FUNCTION
326 krb5_rd_cred2 (krb5_context context,
327 krb5_auth_context auth_context,
335 ret = krb5_rd_cred(context, auth_context, in_data, &creds, NULL);
339 /* Store the creds in the ccache */
341 for(i = 0; creds && creds[i]; i++) {
342 krb5_cc_store_cred(context, ccache, creds[i]);
343 krb5_free_creds(context, creds[i]);