lib/krb5/mcache.c

   1 /*
   2  * Copyright (c) 1997-2004 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 RCSID("$Id$");
  37
  38 typedef struct krb5_mcache {
  39     char *name;
  40     unsigned int refcnt;
  41     int dead;
  42     krb5_principal primary_principal;
  43     struct link {
  44         krb5_creds cred;
  45         struct link *next;
  46     } *creds;
  47     struct krb5_mcache *next;
  48 } krb5_mcache;
  49
  50 static struct krb5_mcache *mcc_head;
  51
  52 #define MCACHE(X)       ((krb5_mcache *)(X)->data.data)
  53
  54 #define MISDEAD(X)      ((X)->dead)
  55
  56 #define MCC_CURSOR(C) ((struct link*)(C))
  57
  58 static const char*
  59 mcc_get_name(krb5_context context,
  60              krb5_ccache id)
  61 {
  62     return MCACHE(id)->name;
  63 }
  64
  65 static krb5_mcache *
  66 mcc_alloc(const char *name)
  67 {
  68     krb5_mcache *m;
  69
  70     ALLOC(m, 1);
  71     if(m == NULL)
  72         return NULL;
  73     if(name == NULL)
  74         asprintf(&m->name, "%p", m);
  75     else
  76         m->name = strdup(name);
  77     if(m->name == NULL) {
  78         free(m);
  79         return NULL;
  80     }
  81     m->dead = 0;
  82     m->refcnt = 1;
  83     m->primary_principal = NULL;
  84     m->creds = NULL;
  85     m->next = mcc_head;
  86     mcc_head = m;
  87     return m;
  88 }
  89
  90 static krb5_error_code
  91 mcc_resolve(krb5_context context, krb5_ccache *id, const char *res)
  92 {
  93     krb5_mcache *m;
  94
  95     for (m = mcc_head; m != NULL; m = m->next)
  96         if (strcmp(m->name, res) == 0)
  97             break;
  98
  99     if (m != NULL) {
 100         m->refcnt++;
 101         (*id)->data.data = m;
 102         (*id)->data.length = sizeof(*m);
 103         return 0;
 104     }
 105
 106     m = mcc_alloc(res);
 107     if (m == NULL) {
 108         krb5_set_error_string (context, "malloc: out of memory");
 109         return KRB5_CC_NOMEM;
 110     }
 111
 112     (*id)->data.data = m;
 113     (*id)->data.length = sizeof(*m);
 114
 115     return 0;
 116 }
 117
 118
 119 static krb5_error_code
 120 mcc_gen_new(krb5_context context, krb5_ccache *id)
 121 {
 122     krb5_mcache *m;
 123
 124     m = mcc_alloc(NULL);
 125
 126     if (m == NULL) {
 127         krb5_set_error_string (context, "malloc: out of memory");
 128         return KRB5_CC_NOMEM;
 129     }
 130
 131     (*id)->data.data = m;
 132     (*id)->data.length = sizeof(*m);
 133
 134     return 0;
 135 }
 136
 137 static krb5_error_code
 138 mcc_initialize(krb5_context context,
 139                krb5_ccache id,
 140                krb5_principal primary_principal)
 141 {
 142     krb5_mcache *m = MCACHE(id);
 143     m->dead = 0;
 144     return krb5_copy_principal (context,
 145                                 primary_principal,
 146                                 &m->primary_principal);
 147 }
 148
 149 static krb5_error_code
 150 mcc_close(krb5_context context,
 151           krb5_ccache id)
 152 {
 153     krb5_mcache *m = MCACHE(id);
 154
 155     if (--m->refcnt != 0)
 156         return 0;
 157
 158     if (MISDEAD(m)) {
 159         free (m->name);
 160         krb5_data_free(&id->data);
 161     }
 162
 163     return 0;
 164 }
 165
 166 static krb5_error_code
 167 mcc_destroy(krb5_context context,
 168             krb5_ccache id)
 169 {
 170     krb5_mcache **n, *m = MCACHE(id);
 171     struct link *l;
 172
 173     if (m->refcnt == 0)
 174         krb5_abortx(context, "mcc_destroy: refcnt already 0");
 175
 176     if (!MISDEAD(m)) {
 177         /* if this is an active mcache, remove it from the linked
 178            list, and free all data */
 179         for(n = &mcc_head; n && *n; n = &(*n)->next) {
 180             if(m == *n) {
 181                 *n = m->next;
 182                 break;
 183             }
 184         }
 185         if (m->primary_principal != NULL) {
 186             krb5_free_principal (context, m->primary_principal);
 187             m->primary_principal = NULL;
 188         }
 189         m->dead = 1;
 190
 191         l = m->creds;
 192         while (l != NULL) {
 193             struct link *old;
 194
 195             krb5_free_creds_contents (context, &l->cred);
 196             old = l;
 197             l = l->next;
 198             free (old);
 199         }
 200         m->creds = NULL;
 201     }
 202     return 0;
 203 }
 204
 205 static krb5_error_code
 206 mcc_store_cred(krb5_context context,
 207                krb5_ccache id,
 208                krb5_creds *creds)
 209 {
 210     krb5_mcache *m = MCACHE(id);
 211     krb5_error_code ret;
 212     struct link *l;
 213
 214     if (MISDEAD(m))
 215         return ENOENT;
 216
 217     l = malloc (sizeof(*l));
 218     if (l == NULL) {
 219         krb5_set_error_string (context, "malloc: out of memory");
 220         return KRB5_CC_NOMEM;
 221     }
 222     l->next = m->creds;
 223     m->creds = l;
 224     memset (&l->cred, 0, sizeof(l->cred));
 225     ret = krb5_copy_creds_contents (context, creds, &l->cred);
 226     if (ret) {
 227         m->creds = l->next;
 228         free (l);
 229         return ret;
 230     }
 231     return 0;
 232 }
 233
 234 static krb5_error_code
 235 mcc_get_principal(krb5_context context,
 236                   krb5_ccache id,
 237                   krb5_principal *principal)
 238 {
 239     krb5_mcache *m = MCACHE(id);
 240
 241     if (MISDEAD(m) || m->primary_principal == NULL)
 242         return ENOENT;
 243     return krb5_copy_principal (context,
 244                                 m->primary_principal,
 245                                 principal);
 246 }
 247
 248 static krb5_error_code
 249 mcc_get_first (krb5_context context,
 250                krb5_ccache id,
 251                krb5_cc_cursor *cursor)
 252 {
 253     krb5_mcache *m = MCACHE(id);
 254
 255     if (MISDEAD(m))
 256         return ENOENT;
 257
 258     *cursor = m->creds;
 259     return 0;
 260 }
 261
 262 static krb5_error_code
 263 mcc_get_next (krb5_context context,
 264               krb5_ccache id,
 265               krb5_cc_cursor *cursor,
 266               krb5_creds *creds)
 267 {
 268     krb5_mcache *m = MCACHE(id);
 269     struct link *l;
 270
 271     if (MISDEAD(m))
 272         return ENOENT;
 273
 274     l = *cursor;
 275     if (l != NULL) {
 276         *cursor = l->next;
 277         return krb5_copy_creds_contents (context,
 278                                          &l->cred,
 279                                          creds);
 280     } else
 281         return KRB5_CC_END;
 282 }
 283
 284 static krb5_error_code
 285 mcc_end_get (krb5_context context,
 286              krb5_ccache id,
 287              krb5_cc_cursor *cursor)
 288 {
 289     return 0;
 290 }
 291
 292 static krb5_error_code
 293 mcc_remove_cred(krb5_context context,
 294                  krb5_ccache id,
 295                  krb5_flags which,
 296                  krb5_creds *mcreds)
 297 {
 298     krb5_mcache *m = MCACHE(id);
 299     struct link **q, *p;
 300     for(q = &m->creds, p = *q; p; p = *q) {
 301         if(krb5_compare_creds(context, which, mcreds, &p->cred)) {
 302             *q = p->next;
 303             krb5_free_creds_contents(context, &p->cred);
 304             free(p);
 305         } else
 306             q = &p->next;
 307     }
 308     return 0;
 309 }
 310
 311 static krb5_error_code
 312 mcc_set_flags(krb5_context context,
 313               krb5_ccache id,
 314               krb5_flags flags)
 315 {
 316     return 0; /* XXX */
 317 }
 318
 319 const krb5_cc_ops krb5_mcc_ops = {
 320     "MEMORY",
 321     mcc_get_name,
 322     mcc_resolve,
 323     mcc_gen_new,
 324     mcc_initialize,
 325     mcc_destroy,
 326     mcc_close,
 327     mcc_store_cred,
 328     NULL, /* mcc_retrieve */
 329     mcc_get_principal,
 330     mcc_get_first,
 331     mcc_get_next,
 332     mcc_end_get,
 333     mcc_remove_cred,
 334     mcc_set_flags
 335 };