Line data Source code
1 : /*
2 : * Copyright (c) 1997 - 2007 Kungliga Tekniska Högskolan
3 : * (Royal Institute of Technology, Stockholm, Sweden).
4 : * All rights reserved.
5 : *
6 : * Redistribution and use in source and binary forms, with or without
7 : * modification, are permitted provided that the following conditions
8 : * are met:
9 : *
10 : * 1. Redistributions of source code must retain the above copyright
11 : * notice, this list of conditions and the following disclaimer.
12 : *
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.
16 : *
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.
20 : *
21 : * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 : * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 : * SUCH DAMAGE.
32 : */
33 :
34 : #include "krb5_locl.h"
35 :
36 : static krb5_error_code
37 0 : compare_addrs(krb5_context context,
38 : krb5_address *a,
39 : krb5_address *b,
40 : const char *message)
41 : {
42 0 : char a_str[64], b_str[64];
43 0 : size_t len;
44 :
45 0 : if(krb5_address_compare (context, a, b))
46 0 : return 0;
47 :
48 0 : krb5_print_address (a, a_str, sizeof(a_str), &len);
49 0 : krb5_print_address (b, b_str, sizeof(b_str), &len);
50 0 : krb5_set_error_message(context, KRB5KRB_AP_ERR_BADADDR,
51 : "%s: %s != %s", message, b_str, a_str);
52 0 : return KRB5KRB_AP_ERR_BADADDR;
53 : }
54 :
55 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
56 48836 : krb5_rd_cred(krb5_context context,
57 : krb5_auth_context auth_context,
58 : krb5_data *in_data,
59 : krb5_creds ***ret_creds,
60 : krb5_replay_data *outdata)
61 : {
62 881 : krb5_error_code ret;
63 881 : size_t len;
64 881 : KRB_CRED cred;
65 881 : EncKrbCredPart enc_krb_cred_part;
66 881 : krb5_data enc_krb_cred_part_data;
67 881 : krb5_crypto crypto;
68 881 : size_t i;
69 :
70 48836 : memset(&enc_krb_cred_part, 0, sizeof(enc_krb_cred_part));
71 48836 : krb5_data_zero(&enc_krb_cred_part_data);
72 :
73 48836 : if ((auth_context->flags &
74 0 : (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE)) &&
75 : outdata == NULL)
76 0 : return KRB5_RC_REQUIRED; /* XXX better error, MIT returns this */
77 :
78 48836 : *ret_creds = NULL;
79 :
80 48836 : ret = decode_KRB_CRED(in_data->data, in_data->length,
81 : &cred, &len);
82 48836 : if(ret) {
83 0 : krb5_clear_error_message(context);
84 0 : return ret;
85 : }
86 :
87 48836 : if (cred.pvno != 5) {
88 0 : ret = KRB5KRB_AP_ERR_BADVERSION;
89 0 : krb5_clear_error_message (context);
90 0 : goto out;
91 : }
92 :
93 48836 : if (cred.msg_type != krb_cred) {
94 0 : ret = KRB5KRB_AP_ERR_MSG_TYPE;
95 0 : krb5_clear_error_message (context);
96 0 : goto out;
97 : }
98 :
99 48836 : if (cred.enc_part.etype == ETYPE_NULL) {
100 : /* DK: MIT GSS-API Compatibility */
101 48836 : enc_krb_cred_part_data.length = cred.enc_part.cipher.length;
102 48836 : enc_krb_cred_part_data.data = cred.enc_part.cipher.data;
103 : } else {
104 : /* Try both subkey and session key.
105 : *
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
108 : * auth_context.
109 : */
110 :
111 0 : if (auth_context->remote_subkey) {
112 0 : ret = krb5_crypto_init(context, auth_context->remote_subkey,
113 : 0, &crypto);
114 0 : if (ret)
115 0 : goto out;
116 :
117 0 : ret = krb5_decrypt_EncryptedData(context,
118 : crypto,
119 : KRB5_KU_KRB_CRED,
120 : &cred.enc_part,
121 : &enc_krb_cred_part_data);
122 :
123 0 : krb5_crypto_destroy(context, crypto);
124 : }
125 :
126 : /*
127 : * If there was not subkey, or we failed using subkey,
128 : * retry using the session key
129 : */
130 0 : if (auth_context->remote_subkey == NULL || ret == KRB5KRB_AP_ERR_BAD_INTEGRITY)
131 : {
132 :
133 0 : ret = krb5_crypto_init(context, auth_context->keyblock,
134 : 0, &crypto);
135 :
136 0 : if (ret)
137 0 : goto out;
138 :
139 0 : ret = krb5_decrypt_EncryptedData(context,
140 : crypto,
141 : KRB5_KU_KRB_CRED,
142 : &cred.enc_part,
143 : &enc_krb_cred_part_data);
144 :
145 0 : krb5_crypto_destroy(context, crypto);
146 : }
147 0 : if (ret)
148 0 : goto out;
149 : }
150 :
151 48836 : ret = decode_EncKrbCredPart(enc_krb_cred_part_data.data,
152 : enc_krb_cred_part_data.length,
153 : &enc_krb_cred_part,
154 : &len);
155 48836 : if (enc_krb_cred_part_data.data != cred.enc_part.cipher.data)
156 0 : krb5_data_free(&enc_krb_cred_part_data);
157 48836 : if (ret) {
158 0 : krb5_set_error_message(context, ret,
159 0 : N_("Failed to decode "
160 : "encrypte credential part", ""));
161 0 : goto out;
162 : }
163 :
164 : /* check sender address */
165 :
166 48836 : if (enc_krb_cred_part.s_address
167 0 : && auth_context->remote_address
168 0 : && auth_context->remote_port) {
169 0 : krb5_address *a;
170 :
171 0 : ret = krb5_make_addrport (context, &a,
172 0 : auth_context->remote_address,
173 0 : auth_context->remote_port);
174 0 : if (ret)
175 0 : goto out;
176 :
177 :
178 0 : ret = compare_addrs(context, a, enc_krb_cred_part.s_address,
179 0 : N_("sender address is wrong "
180 : "in received creds", ""));
181 0 : krb5_free_address(context, a);
182 0 : free(a);
183 0 : if(ret)
184 0 : goto out;
185 : }
186 :
187 : /* check receiver address */
188 :
189 48836 : if (enc_krb_cred_part.r_address
190 0 : && auth_context->local_address) {
191 0 : if(auth_context->local_port &&
192 0 : enc_krb_cred_part.r_address->addr_type == KRB5_ADDRESS_ADDRPORT) {
193 0 : krb5_address *a;
194 0 : ret = krb5_make_addrport (context, &a,
195 0 : auth_context->local_address,
196 0 : auth_context->local_port);
197 0 : if (ret)
198 0 : goto out;
199 :
200 0 : ret = compare_addrs(context, a, enc_krb_cred_part.r_address,
201 0 : N_("receiver address is wrong "
202 : "in received creds", ""));
203 0 : krb5_free_address(context, a);
204 0 : free(a);
205 0 : if(ret)
206 0 : goto out;
207 : } else {
208 0 : ret = compare_addrs(context, auth_context->local_address,
209 0 : enc_krb_cred_part.r_address,
210 0 : N_("receiver address is wrong "
211 : "in received creds", ""));
212 0 : if(ret)
213 0 : goto out;
214 : }
215 : }
216 :
217 : /* check timestamp */
218 48836 : if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) {
219 0 : krb5_timestamp sec;
220 :
221 0 : krb5_timeofday (context, &sec);
222 :
223 0 : if (enc_krb_cred_part.timestamp == NULL ||
224 0 : enc_krb_cred_part.usec == NULL ||
225 0 : krb5_time_abs(*enc_krb_cred_part.timestamp, sec)
226 0 : > context->max_skew) {
227 0 : krb5_clear_error_message (context);
228 0 : ret = KRB5KRB_AP_ERR_SKEW;
229 0 : goto out;
230 : }
231 : }
232 :
233 48836 : if ((auth_context->flags &
234 : (KRB5_AUTH_CONTEXT_RET_TIME | KRB5_AUTH_CONTEXT_RET_SEQUENCE))) {
235 : /* if these fields are not present in the cred-part, silently
236 : return zero */
237 0 : memset(outdata, 0, sizeof(*outdata));
238 0 : if(enc_krb_cred_part.timestamp)
239 0 : outdata->timestamp = *enc_krb_cred_part.timestamp;
240 0 : if(enc_krb_cred_part.usec)
241 0 : outdata->usec = *enc_krb_cred_part.usec;
242 0 : if(enc_krb_cred_part.nonce)
243 0 : outdata->seq = *enc_krb_cred_part.nonce;
244 : }
245 :
246 : /* Convert to NULL terminated list of creds */
247 :
248 48836 : *ret_creds = calloc(enc_krb_cred_part.ticket_info.len + 1,
249 : sizeof(**ret_creds));
250 :
251 48836 : if (*ret_creds == NULL) {
252 0 : ret = krb5_enomem(context);
253 0 : goto out;
254 : }
255 :
256 97672 : for (i = 0; i < enc_krb_cred_part.ticket_info.len; ++i) {
257 48836 : KrbCredInfo *kci = &enc_krb_cred_part.ticket_info.val[i];
258 881 : krb5_creds *creds;
259 :
260 48836 : creds = calloc(1, sizeof(*creds));
261 48836 : if(creds == NULL) {
262 0 : ret = krb5_enomem(context);
263 0 : goto out;
264 : }
265 :
266 48836 : ASN1_MALLOC_ENCODE(Ticket, creds->ticket.data, creds->ticket.length,
267 : &cred.tickets.val[i], &len, ret);
268 48836 : if (ret) {
269 0 : free(creds);
270 0 : goto out;
271 : }
272 48836 : if(creds->ticket.length != len)
273 0 : krb5_abortx(context, "internal error in ASN.1 encoder");
274 48836 : ret = copy_EncryptionKey (&kci->key, &creds->session);
275 48836 : if (ret) {
276 0 : krb5_free_creds(context, creds);
277 0 : goto out;
278 : }
279 48836 : if (kci->prealm && kci->pname)
280 48836 : _krb5_principalname2krb5_principal (context,
281 : &creds->client,
282 47955 : *kci->pname,
283 47955 : *kci->prealm);
284 48836 : if (kci->flags)
285 48836 : creds->flags.b = *kci->flags;
286 48836 : if (kci->authtime)
287 48836 : creds->times.authtime = *kci->authtime;
288 48836 : if (kci->starttime)
289 48836 : creds->times.starttime = *kci->starttime;
290 48836 : if (kci->endtime)
291 48836 : creds->times.endtime = *kci->endtime;
292 48836 : if (kci->renew_till)
293 48836 : creds->times.renew_till = *kci->renew_till;
294 48836 : if (kci->srealm && kci->sname)
295 48836 : _krb5_principalname2krb5_principal (context,
296 : &creds->server,
297 47955 : *kci->sname,
298 47955 : *kci->srealm);
299 48836 : if (kci->caddr)
300 48836 : krb5_copy_addresses (context,
301 47955 : kci->caddr,
302 : &creds->addresses);
303 :
304 48836 : (*ret_creds)[i] = creds;
305 :
306 : }
307 48836 : (*ret_creds)[i] = NULL;
308 :
309 48836 : free_KRB_CRED (&cred);
310 48836 : free_EncKrbCredPart(&enc_krb_cred_part);
311 :
312 48836 : return 0;
313 :
314 0 : out:
315 0 : free_EncKrbCredPart(&enc_krb_cred_part);
316 0 : free_KRB_CRED (&cred);
317 0 : if(*ret_creds) {
318 0 : for(i = 0; (*ret_creds)[i]; i++)
319 0 : krb5_free_creds(context, (*ret_creds)[i]);
320 0 : free(*ret_creds);
321 0 : *ret_creds = NULL;
322 : }
323 0 : return ret;
324 : }
325 :
326 : KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
327 48836 : krb5_rd_cred2 (krb5_context context,
328 : krb5_auth_context auth_context,
329 : krb5_ccache ccache,
330 : krb5_data *in_data)
331 : {
332 881 : krb5_error_code ret;
333 881 : krb5_creds **creds;
334 881 : int i;
335 :
336 48836 : ret = krb5_rd_cred(context, auth_context, in_data, &creds, NULL);
337 48836 : if(ret)
338 0 : return ret;
339 :
340 : /* Store the creds in the ccache */
341 :
342 97672 : for(i = 0; creds && creds[i]; i++) {
343 48836 : krb5_cc_store_cred(context, ccache, creds[i]);
344 48836 : krb5_free_creds(context, creds[i]);
345 : }
346 48836 : free(creds);
347 48836 : return 0;
348 : }
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