2 * Copyright (c) 1997 - 2007 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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34 #include <krb5_locl.h>
36 RCSID("$Id: rd_cred.c 20304 2007-04-11 11:15:05Z lha $");
38 static krb5_error_code
39 compare_addrs(krb5_context context,
44 char a_str[64], b_str[64];
47 if(krb5_address_compare (context, a, b))
50 krb5_print_address (a, a_str, sizeof(a_str), &len);
51 krb5_print_address (b, b_str, sizeof(b_str), &len);
52 krb5_set_error_string(context, "%s: %s != %s", message, b_str, a_str);
53 return KRB5KRB_AP_ERR_BADADDR;
56 krb5_error_code KRB5_LIB_FUNCTION
57 krb5_rd_cred(krb5_context context,
58 krb5_auth_context auth_context,
60 krb5_creds ***ret_creds,
61 krb5_replay_data *outdata)
66 EncKrbCredPart enc_krb_cred_part;
67 krb5_data enc_krb_cred_part_data;
71 memset(&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
73 if ((auth_context->flags &
74 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
76 return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
80 ret = decode_KRB_CRED(in_data->data, in_data->length,
83 krb5_clear_error_string(context);
88 ret = KRB5KRB_AP_ERR_BADVERSION;
89 krb5_clear_error_string (context);
93 if (cred.msg_type != krb_cred) {
94 ret = KRB5KRB_AP_ERR_MSG_TYPE;
95 krb5_clear_error_string (context);
99 if (cred.enc_part.etype == ETYPE_NULL) {
100 /* DK: MIT GSS-API Compatibility */
101 enc_krb_cred_part_data.length = cred.enc_part.cipher.length;
102 enc_krb_cred_part_data.data = cred.enc_part.cipher.data;
104 /* Try both subkey and session key.
106 * RFC4120 claims we should use the session key, but Heimdal
107 * before 0.8 used the remote subkey if it was send in the
111 if (auth_context->remote_subkey) {
112 ret = krb5_crypto_init(context, auth_context->remote_subkey,
117 ret = krb5_decrypt_EncryptedData(context,
121 &enc_krb_cred_part_data);
123 krb5_crypto_destroy(context, crypto);
127 * If there was not subkey, or we failed using subkey,
128 * retry using the session key
130 if (auth_context->remote_subkey == NULL || ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
133 ret = krb5_crypto_init(context, auth_context->keyblock,
139 ret = krb5_decrypt_EncryptedData(context,
143 &enc_krb_cred_part_data);
145 krb5_crypto_destroy(context, crypto);
151 ret = krb5_decode_EncKrbCredPart (context,
152 enc_krb_cred_part_data.data,
153 enc_krb_cred_part_data.length,
156 if (enc_krb_cred_part_data.data != cred.enc_part.cipher.data)
157 krb5_data_free(&enc_krb_cred_part_data);
161 /* check sender address */
163 if (enc_krb_cred_part.s_address
164 && auth_context->remote_address
165 && auth_context->remote_port) {
168 ret = krb5_make_addrport (context, &a,
169 auth_context->remote_address,
170 auth_context->remote_port);
175 ret = compare_addrs(context, a, enc_krb_cred_part.s_address,
176 "sender address is wrong in received creds");
177 krb5_free_address(context, a);
183 /* check receiver address */
185 if (enc_krb_cred_part.r_address
186 && auth_context->local_address) {
187 if(auth_context->local_port &&
188 enc_krb_cred_part.r_address->addr_type == KRB5_ADDRESS_ADDRPORT) {
190 ret = krb5_make_addrport (context, &a,
191 auth_context->local_address,
192 auth_context->local_port);
196 ret = compare_addrs(context, a, enc_krb_cred_part.r_address,
197 "receiver address is wrong in received creds");
198 krb5_free_address(context, a);
203 ret = compare_addrs(context, auth_context->local_address,
204 enc_krb_cred_part.r_address,
205 "receiver address is wrong in received creds");
211 /* check timestamp */
212 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
215 krb5_timeofday (context, &sec);
217 if (enc_krb_cred_part.timestamp == NULL ||
218 enc_krb_cred_part.usec == NULL ||
219 abs(*enc_krb_cred_part.timestamp - sec)
220 > context->max_skew) {
221 krb5_clear_error_string (context);
222 ret = KRB5KRB_AP_ERR_SKEW;
227 if ((auth_context->flags &
228 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE))) {
229 /* if these fields are not present in the cred-part, silently
231 memset(outdata, 0, sizeof(*outdata));
232 if(enc_krb_cred_part.timestamp)
233 outdata->timestamp = *enc_krb_cred_part.timestamp;
234 if(enc_krb_cred_part.usec)
235 outdata->usec = *enc_krb_cred_part.usec;
236 if(enc_krb_cred_part.nonce)
237 outdata->seq = *enc_krb_cred_part.nonce;
240 /* Convert to NULL terminated list of creds */
242 *ret_creds = calloc(enc_krb_cred_part.ticket_info.len + 1,
243 sizeof(**ret_creds));
245 if (*ret_creds == NULL) {
247 krb5_set_error_string (context, "malloc: out of memory");
251 for (i = 0; i < enc_krb_cred_part.ticket_info.len; ++i) {
252 KrbCredInfo *kci = &enc_krb_cred_part.ticket_info.val[i];
255 creds = calloc(1, sizeof(*creds));
258 krb5_set_error_string (context, "malloc: out of memory");
262 ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
263 &cred.tickets.val[i], &len, ret);
268 if(creds->ticket.length != len)
269 krb5_abortx(context, "internal error in ASN.1 encoder");
270 copy_EncryptionKey (&kci->key, &creds->session);
271 if (kci->prealm && kci->pname)
272 _krb5_principalname2krb5_principal (context,
277 creds->flags.b = *kci->flags;
279 creds->times.authtime = *kci->authtime;
281 creds->times.starttime = *kci->starttime;
283 creds->times.endtime = *kci->endtime;
285 creds->times.renew_till = *kci->renew_till;
286 if (kci->srealm && kci->sname)
287 _krb5_principalname2krb5_principal (context,
292 krb5_copy_addresses (context,
296 (*ret_creds)[i] = creds;
299 (*ret_creds)[i] = NULL;
301 free_KRB_CRED (&cred);
302 free_EncKrbCredPart(&enc_krb_cred_part);
307 free_EncKrbCredPart(&enc_krb_cred_part);
308 free_KRB_CRED (&cred);
310 for(i = 0; (*ret_creds)[i]; i++)
311 krb5_free_creds(context, (*ret_creds)[i]);
318 krb5_error_code KRB5_LIB_FUNCTION
319 krb5_rd_cred2 (krb5_context context,
320 krb5_auth_context auth_context,
328 ret = krb5_rd_cred(context, auth_context, in_data, &creds, NULL);
332 /* Store the creds in the ccache */
334 for(i = 0; creds && creds[i]; i++) {
335 krb5_cc_store_cred(context, ccache, creds[i]);
336 krb5_free_creds(context, creds[i]);