2 * Copyright (c) 1997 - 2005 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,v 1.26 2005/11/02 08:36:42 lha Exp $");
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,
86 ret = KRB5KRB_AP_ERR_BADVERSION;
87 krb5_clear_error_string (context);
91 if (cred.msg_type != krb_cred) {
92 ret = KRB5KRB_AP_ERR_MSG_TYPE;
93 krb5_clear_error_string (context);
97 if (cred.enc_part.etype == ETYPE_NULL) {
98 /* DK: MIT GSS-API Compatibility */
99 enc_krb_cred_part_data.length = cred.enc_part.cipher.length;
100 enc_krb_cred_part_data.data = cred.enc_part.cipher.data;
102 /* Try both subkey and session key.
104 * RFC4120 claims we should use the session key, but Heimdal
105 * before 0.8 used the remote subkey if it was send in the
109 if (auth_context->remote_subkey) {
110 ret = krb5_crypto_init(context, auth_context->remote_subkey,
115 ret = krb5_decrypt_EncryptedData(context,
119 &enc_krb_cred_part_data);
121 krb5_crypto_destroy(context, crypto);
125 * If there was not subkey, or we failed using subkey,
126 * retry using the session key
128 if (auth_context->remote_subkey == NULL || ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
131 ret = krb5_crypto_init(context, auth_context->keyblock,
137 ret = krb5_decrypt_EncryptedData(context,
141 &enc_krb_cred_part_data);
143 krb5_crypto_destroy(context, crypto);
149 ret = krb5_decode_EncKrbCredPart (context,
150 enc_krb_cred_part_data.data,
151 enc_krb_cred_part_data.length,
157 /* check sender address */
159 if (enc_krb_cred_part.s_address
160 && auth_context->remote_address
161 && auth_context->remote_port) {
164 ret = krb5_make_addrport (context, &a,
165 auth_context->remote_address,
166 auth_context->remote_port);
171 ret = compare_addrs(context, a, enc_krb_cred_part.s_address,
172 "sender address is wrong in received creds");
173 krb5_free_address(context, a);
179 /* check receiver address */
181 if (enc_krb_cred_part.r_address
182 && auth_context->local_address) {
183 if(auth_context->local_port &&
184 enc_krb_cred_part.r_address->addr_type == KRB5_ADDRESS_ADDRPORT) {
186 ret = krb5_make_addrport (context, &a,
187 auth_context->local_address,
188 auth_context->local_port);
192 ret = compare_addrs(context, a, enc_krb_cred_part.r_address,
193 "receiver address is wrong in received creds");
194 krb5_free_address(context, a);
199 ret = compare_addrs(context, auth_context->local_address,
200 enc_krb_cred_part.r_address,
201 "receiver address is wrong in received creds");
207 /* check timestamp */
208 if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
211 krb5_timeofday (context, &sec);
213 if (enc_krb_cred_part.timestamp == NULL ||
214 enc_krb_cred_part.usec == NULL ||
215 abs(*enc_krb_cred_part.timestamp - sec)
216 > context->max_skew) {
217 krb5_clear_error_string (context);
218 ret = KRB5KRB_AP_ERR_SKEW;
223 if ((auth_context->flags &
224 (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE))) {
225 /* if these fields are not present in the cred-part, silently
227 memset(outdata, 0, sizeof(*outdata));
228 if(enc_krb_cred_part.timestamp)
229 outdata->timestamp = *enc_krb_cred_part.timestamp;
230 if(enc_krb_cred_part.usec)
231 outdata->usec = *enc_krb_cred_part.usec;
232 if(enc_krb_cred_part.nonce)
233 outdata->seq = *enc_krb_cred_part.nonce;
236 /* Convert to NULL terminated list of creds */
238 *ret_creds = calloc(enc_krb_cred_part.ticket_info.len + 1,
239 sizeof(**ret_creds));
241 if (*ret_creds == NULL) {
243 krb5_set_error_string (context, "malloc: out of memory");
247 for (i = 0; i < enc_krb_cred_part.ticket_info.len; ++i) {
248 KrbCredInfo *kci = &enc_krb_cred_part.ticket_info.val[i];
251 creds = calloc(1, sizeof(*creds));
254 krb5_set_error_string (context, "malloc: out of memory");
258 ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
259 &cred.tickets.val[i], &len, ret);
262 if(creds->ticket.length != len)
263 krb5_abortx(context, "internal error in ASN.1 encoder");
264 copy_EncryptionKey (&kci->key, &creds->session);
265 if (kci->prealm && kci->pname)
266 _krb5_principalname2krb5_principal (&creds->client,
270 creds->flags.b = *kci->flags;
272 creds->times.authtime = *kci->authtime;
274 creds->times.starttime = *kci->starttime;
276 creds->times.endtime = *kci->endtime;
278 creds->times.renew_till = *kci->renew_till;
279 if (kci->srealm && kci->sname)
280 _krb5_principalname2krb5_principal (&creds->server,
284 krb5_copy_addresses (context,
288 (*ret_creds)[i] = creds;
291 (*ret_creds)[i] = NULL;
293 free_KRB_CRED (&cred);
294 free_EncKrbCredPart(&enc_krb_cred_part);
299 free_EncKrbCredPart(&enc_krb_cred_part);
300 free_KRB_CRED (&cred);
302 for(i = 0; (*ret_creds)[i]; i++)
303 krb5_free_creds(context, (*ret_creds)[i]);
309 krb5_error_code KRB5_LIB_FUNCTION
310 krb5_rd_cred2 (krb5_context context,
311 krb5_auth_context auth_context,
319 ret = krb5_rd_cred(context, auth_context, in_data, &creds, NULL);
323 /* Store the creds in the ccache */
325 for(i = 0; creds && creds[i]; i++) {
326 krb5_cc_store_cred(context, ccache, creds[i]);
327 krb5_free_creds(context, creds[i]);