crypto/heimdal-0.6.3/lib/krb5/replay.c

   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
  37 RCSID("$Id: replay.c,v 1.9 2001/07/03 19:33:13 assar Exp $");
  38
  39 struct krb5_rcache_data {
  40     char *name;
  41 };
  42
  43 krb5_error_code
  44 krb5_rc_resolve(krb5_context context,
  45                 krb5_rcache id,
  46                 const char *name)
  47 {
  48     id->name = strdup(name);
  49     if(id->name == NULL) {
  50         krb5_set_error_string (context, "malloc: out of memory");
  51         return KRB5_RC_MALLOC;
  52     }
  53     return 0;
  54 }
  55
  56 krb5_error_code
  57 krb5_rc_resolve_type(krb5_context context,
  58                      krb5_rcache *id,
  59                      const char *type)
  60 {
  61     if(strcmp(type, "FILE")) {
  62         krb5_set_error_string (context, "replay cache type %s not supported",
  63                                type);
  64         return KRB5_RC_TYPE_NOTFOUND;
  65     }
  66     *id = calloc(1, sizeof(**id));
  67     if(*id == NULL) {
  68         krb5_set_error_string (context, "malloc: out of memory");
  69         return KRB5_RC_MALLOC;
  70     }
  71     return 0;
  72 }
  73
  74 krb5_error_code
  75 krb5_rc_resolve_full(krb5_context context,
  76                      krb5_rcache *id,
  77                      const char *string_name)
  78 {
  79     krb5_error_code ret;
  80     if(strncmp(string_name, "FILE:", 5)) {
  81         krb5_set_error_string (context, "replay cache type %s not supported",
  82                                string_name);
  83         return KRB5_RC_TYPE_NOTFOUND;
  84     }
  85     ret = krb5_rc_resolve_type(context, id, "FILE");
  86     if(ret)
  87         return ret;
  88     ret = krb5_rc_resolve(context, *id, string_name + 5);
  89     return ret;
  90 }
  91
  92 const char *
  93 krb5_rc_default_name(krb5_context context)
  94 {
  95     return "FILE:/var/run/default_rcache";
  96 }
  97
  98 const char *
  99 krb5_rc_default_type(krb5_context context)
 100 {
 101     return "FILE";
 102 }
 103
 104 krb5_error_code
 105 krb5_rc_default(krb5_context context,
 106                 krb5_rcache *id)
 107 {
 108     return krb5_rc_resolve_full(context, id, krb5_rc_default_name(context));
 109 }
 110
 111 struct rc_entry{
 112     time_t stamp;
 113     unsigned char data[16];
 114 };
 115
 116 krb5_error_code
 117 krb5_rc_initialize(krb5_context context,
 118                    krb5_rcache id,
 119                    krb5_deltat auth_lifespan)
 120 {
 121     FILE *f = fopen(id->name, "w");
 122     struct rc_entry tmp;
 123     int ret;
 124
 125     if(f == NULL) {
 126         ret = errno;
 127         krb5_set_error_string (context, "open(%s): %s", id->name,
 128                                strerror(ret));
 129         return ret;
 130     }
 131     tmp.stamp = auth_lifespan;
 132     fwrite(&tmp, 1, sizeof(tmp), f);
 133     fclose(f);
 134     return 0;
 135 }
 136
 137 krb5_error_code
 138 krb5_rc_recover(krb5_context context,
 139                 krb5_rcache id)
 140 {
 141     return 0;
 142 }
 143
 144 krb5_error_code
 145 krb5_rc_destroy(krb5_context context,
 146                 krb5_rcache id)
 147 {
 148     int ret;
 149
 150     if(remove(id->name) < 0) {
 151         ret = errno;
 152         krb5_set_error_string (context, "remove(%s): %s", id->name,
 153                                strerror(ret));
 154         return ret;
 155     }
 156     return krb5_rc_close(context, id);
 157 }
 158
 159 krb5_error_code
 160 krb5_rc_close(krb5_context context,
 161               krb5_rcache id)
 162 {
 163     free(id->name);
 164     free(id);
 165     return 0;
 166 }
 167
 168 static void
 169 checksum_authenticator(Authenticator *auth, void *data)
 170 {
 171     MD5_CTX md5;
 172     int i;
 173
 174     MD5_Init (&md5);
 175     MD5_Update (&md5, auth->crealm, strlen(auth->crealm));
 176     for(i = 0; i < auth->cname.name_string.len; i++)
 177         MD5_Update(&md5, auth->cname.name_string.val[i],
 178                    strlen(auth->cname.name_string.val[i]));
 179     MD5_Update (&md5, &auth->ctime, sizeof(auth->ctime));
 180     MD5_Update (&md5, &auth->cusec, sizeof(auth->cusec));
 181     MD5_Final (data, &md5);
 182 }
 183
 184 krb5_error_code
 185 krb5_rc_store(krb5_context context,
 186               krb5_rcache id,
 187               krb5_donot_replay *rep)
 188 {
 189     struct rc_entry ent, tmp;
 190     time_t t;
 191     FILE *f;
 192     int ret;
 193
 194     ent.stamp = time(NULL);
 195     checksum_authenticator(rep, ent.data);
 196     f = fopen(id->name, "r");
 197     if(f == NULL) {
 198         ret = errno;
 199         krb5_set_error_string (context, "open(%s): %s", id->name,
 200                                strerror(ret));
 201         return ret;
 202     }
 203     fread(&tmp, sizeof(ent), 1, f);
 204     t = ent.stamp - tmp.stamp;
 205     while(fread(&tmp, sizeof(ent), 1, f)){
 206         if(tmp.stamp < t)
 207             continue;
 208         if(memcmp(tmp.data, ent.data, sizeof(ent.data)) == 0){
 209             fclose(f);
 210             krb5_clear_error_string (context);
 211             return KRB5_RC_REPLAY;
 212         }
 213     }
 214     if(ferror(f)){
 215         ret = errno;
 216         fclose(f);
 217         krb5_set_error_string (context, "%s: %s", id->name, strerror(ret));
 218         return ret;
 219     }
 220     fclose(f);
 221     f = fopen(id->name, "a");
 222     if(f == NULL) {
 223         krb5_set_error_string (context, "open(%s): %s", id->name,
 224                                strerror(errno));
 225         return KRB5_RC_IO_UNKNOWN;
 226     }
 227     fwrite(&ent, 1, sizeof(ent), f);
 228     fclose(f);
 229     return 0;
 230 }
 231
 232 krb5_error_code
 233 krb5_rc_expunge(krb5_context context,
 234                 krb5_rcache id)
 235 {
 236     return 0;
 237 }
 238
 239 krb5_error_code
 240 krb5_rc_get_lifespan(krb5_context context,
 241                      krb5_rcache id,
 242                      krb5_deltat *auth_lifespan)
 243 {
 244     FILE *f = fopen(id->name, "r");
 245     int r;
 246     struct rc_entry ent;
 247     r = fread(&ent, sizeof(ent), 1, f);
 248     fclose(f);
 249     if(r){
 250         *auth_lifespan = ent.stamp;
 251         return 0;
 252     }
 253     krb5_clear_error_string (context);
 254     return KRB5_RC_IO_UNKNOWN;
 255 }
 256
 257 const char*
 258 krb5_rc_get_name(krb5_context context,
 259                  krb5_rcache id)
 260 {
 261     return id->name;
 262 }
 263
 264 const char*
 265 krb5_rc_get_type(krb5_context context,
 266                  krb5_rcache id)
 267 {
 268     return "FILE";
 269 }
 270
 271 krb5_error_code
 272 krb5_get_server_rcache(krb5_context context,
 273                        const krb5_data *piece,
 274                        krb5_rcache *id)
 275 {
 276     krb5_rcache rcache;
 277     krb5_error_code ret;
 278
 279     char *tmp = malloc(4 * piece->length + 1);
 280     char *name;
 281
 282     if(tmp == NULL) {
 283         krb5_set_error_string (context, "malloc: out of memory");
 284         return ENOMEM;
 285     }
 286     strvisx(tmp, piece->data, piece->length, VIS_WHITE | VIS_OCTAL);
 287 #ifdef HAVE_GETEUID
 288     asprintf(&name, "FILE:rc_%s_%u", tmp, (unsigned)geteuid());
 289 #else
 290     asprintf(&name, "FILE:rc_%s", tmp);
 291 #endif
 292     free(tmp);
 293     if(name == NULL) {
 294         krb5_set_error_string (context, "malloc: out of memory");
 295         return ENOMEM;
 296     }
 297
 298     ret = krb5_rc_resolve_full(context, &rcache, name);
 299     free(name);
 300     if(ret)
 301         return ret;
 302     *id = rcache;
 303     return ret;
 304 }