source: trunk/server/source4/heimdal/lib/krb5/replay.c

Last change on this file was 745, checked in by Silvan Scherrer, 13 years ago

Samba Server: updated trunk to 3.6.0
File size: 8.6 KB
Line 
1/*
2 * Copyright (c) 1997-2001 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#include <vis.h>
36
37struct krb5_rcache_data {
38 char *name;
39};
40
41KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
42krb5_rc_resolve(krb5_context context,
43 krb5_rcache id,
44 const char *name)
45{
46 id->name = strdup(name);
47 if(id->name == NULL) {
48 krb5_set_error_message(context, KRB5_RC_MALLOC,
49 N_("malloc: out of memory", ""));
50 return KRB5_RC_MALLOC;
51 }
52 return 0;
53}
54
55KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
56krb5_rc_resolve_type(krb5_context context,
57 krb5_rcache *id,
58 const char *type)
59{
60 *id = NULL;
61 if(strcmp(type, "FILE")) {
62 krb5_set_error_message (context, KRB5_RC_TYPE_NOTFOUND,
63 N_("replay cache type %s not supported", ""),
64 type);
65 return KRB5_RC_TYPE_NOTFOUND;
66 }
67 *id = calloc(1, sizeof(**id));
68 if(*id == NULL) {
69 krb5_set_error_message(context, KRB5_RC_MALLOC,
70 N_("malloc: out of memory", ""));
71 return KRB5_RC_MALLOC;
72 }
73 return 0;
74}
75
76KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
77krb5_rc_resolve_full(krb5_context context,
78 krb5_rcache *id,
79 const char *string_name)
80{
81 krb5_error_code ret;
82
83 *id = NULL;
84
85 if(strncmp(string_name, "FILE:", 5)) {
86 krb5_set_error_message(context, KRB5_RC_TYPE_NOTFOUND,
87 N_("replay cache type %s not supported", ""),
88 string_name);
89 return KRB5_RC_TYPE_NOTFOUND;
90 }
91 ret = krb5_rc_resolve_type(context, id, "FILE");
92 if(ret)
93 return ret;
94 ret = krb5_rc_resolve(context, *id, string_name + 5);
95 if (ret) {
96 krb5_rc_close(context, *id);
97 *id = NULL;
98 }
99 return ret;
100}
101
102KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
103krb5_rc_default_name(krb5_context context)
104{
105 return "FILE:/var/run/default_rcache";
106}
107
108KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
109krb5_rc_default_type(krb5_context context)
110{
111 return "FILE";
112}
113
114KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
115krb5_rc_default(krb5_context context,
116 krb5_rcache *id)
117{
118 return krb5_rc_resolve_full(context, id, krb5_rc_default_name(context));
119}
120
121struct rc_entry{
122 time_t stamp;
123 unsigned char data[16];
124};
125
126KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
127krb5_rc_initialize(krb5_context context,
128 krb5_rcache id,
129 krb5_deltat auth_lifespan)
130{
131 FILE *f = fopen(id->name, "w");
132 struct rc_entry tmp;
133 int ret;
134
135 if(f == NULL) {
136 char buf[128];
137 ret = errno;
138 rk_strerror_r(ret, buf, sizeof(buf));
139 krb5_set_error_message(context, ret, "open(%s): %s", id->name, buf);
140 return ret;
141 }
142 tmp.stamp = auth_lifespan;
143 fwrite(&tmp, 1, sizeof(tmp), f);
144 fclose(f);
145 return 0;
146}
147
148KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
149krb5_rc_recover(krb5_context context,
150 krb5_rcache id)
151{
152 return 0;
153}
154
155KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
156krb5_rc_destroy(krb5_context context,
157 krb5_rcache id)
158{
159 int ret;
160
161 if(remove(id->name) < 0) {
162 char buf[128];
163 ret = errno;
164 rk_strerror_r(ret, buf, sizeof(buf));
165 krb5_set_error_message(context, ret, "remove(%s): %s", id->name, buf);
166 return ret;
167 }
168 return krb5_rc_close(context, id);
169}
170
171KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
172krb5_rc_close(krb5_context context,
173 krb5_rcache id)
174{
175 free(id->name);
176 free(id);
177 return 0;
178}
179
180static void
181checksum_authenticator(Authenticator *auth, void *data)
182{
183 EVP_MD_CTX *m = EVP_MD_CTX_create();
184 unsigned i;
185
186 EVP_DigestInit_ex(m, EVP_md5(), NULL);
187
188 EVP_DigestUpdate(m, auth->crealm, strlen(auth->crealm));
189 for(i = 0; i < auth->cname.name_string.len; i++)
190 EVP_DigestUpdate(m, auth->cname.name_string.val[i],
191 strlen(auth->cname.name_string.val[i]));
192 EVP_DigestUpdate(m, &auth->ctime, sizeof(auth->ctime));
193 EVP_DigestUpdate(m, &auth->cusec, sizeof(auth->cusec));
194
195 EVP_DigestFinal_ex(m, data, NULL);
196 EVP_MD_CTX_destroy(m);
197}
198
199KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
200krb5_rc_store(krb5_context context,
201 krb5_rcache id,
202 krb5_donot_replay *rep)
203{
204 struct rc_entry ent, tmp;
205 time_t t;
206 FILE *f;
207 int ret;
208
209 ent.stamp = time(NULL);
210 checksum_authenticator(rep, ent.data);
211 f = fopen(id->name, "r");
212 if(f == NULL) {
213 char buf[128];
214 ret = errno;
215 rk_strerror_r(ret, buf, sizeof(buf));
216 krb5_set_error_message(context, ret, "open(%s): %s", id->name, buf);
217 return ret;
218 }
219 rk_cloexec_file(f);
220 fread(&tmp, sizeof(ent), 1, f);
221 t = ent.stamp - tmp.stamp;
222 while(fread(&tmp, sizeof(ent), 1, f)){
223 if(tmp.stamp < t)
224 continue;
225 if(memcmp(tmp.data, ent.data, sizeof(ent.data)) == 0){
226 fclose(f);
227 krb5_clear_error_message (context);
228 return KRB5_RC_REPLAY;
229 }
230 }
231 if(ferror(f)){
232 char buf[128];
233 ret = errno;
234 fclose(f);
235 rk_strerror_r(ret, buf, sizeof(buf));
236 krb5_set_error_message(context, ret, "%s: %s",
237 id->name, buf);
238 return ret;
239 }
240 fclose(f);
241 f = fopen(id->name, "a");
242 if(f == NULL) {
243 char buf[128];
244 rk_strerror_r(errno, buf, sizeof(buf));
245 krb5_set_error_message(context, KRB5_RC_IO_UNKNOWN,
246 "open(%s): %s", id->name, buf);
247 return KRB5_RC_IO_UNKNOWN;
248 }
249 fwrite(&ent, 1, sizeof(ent), f);
250 fclose(f);
251 return 0;
252}
253
254KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
255krb5_rc_expunge(krb5_context context,
256 krb5_rcache id)
257{
258 return 0;
259}
260
261KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
262krb5_rc_get_lifespan(krb5_context context,
263 krb5_rcache id,
264 krb5_deltat *auth_lifespan)
265{
266 FILE *f = fopen(id->name, "r");
267 int r;
268 struct rc_entry ent;
269 r = fread(&ent, sizeof(ent), 1, f);
270 fclose(f);
271 if(r){
272 *auth_lifespan = ent.stamp;
273 return 0;
274 }
275 krb5_clear_error_message (context);
276 return KRB5_RC_IO_UNKNOWN;
277}
278
279KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
280krb5_rc_get_name(krb5_context context,
281 krb5_rcache id)
282{
283 return id->name;
284}
285
286KRB5_LIB_FUNCTION const char* KRB5_LIB_CALL
287krb5_rc_get_type(krb5_context context,
288 krb5_rcache id)
289{
290 return "FILE";
291}
292
293KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
294krb5_get_server_rcache(krb5_context context,
295 const krb5_data *piece,
296 krb5_rcache *id)
297{
298 krb5_rcache rcache;
299 krb5_error_code ret;
300
301 char *tmp = malloc(4 * piece->length + 1);
302 char *name;
303
304 if(tmp == NULL) {
305 krb5_set_error_message(context, ENOMEM,
306 N_("malloc: out of memory", ""));
307 return ENOMEM;
308 }
309 strvisx(tmp, piece->data, piece->length, VIS_WHITE | VIS_OCTAL);
310#ifdef HAVE_GETEUID
311 ret = asprintf(&name, "FILE:rc_%s_%u", tmp, (unsigned)geteuid());
312#else
313 ret = asprintf(&name, "FILE:rc_%s", tmp);
314#endif
315 free(tmp);
316 if(ret < 0 || name == NULL) {
317 krb5_set_error_message(context, ENOMEM,
318 N_("malloc: out of memory", ""));
319 return ENOMEM;
320 }
321
322 ret = krb5_rc_resolve_full(context, &rcache, name);
323 free(name);
324 if(ret)
325 return ret;
326 *id = rcache;
327 return ret;
328}
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