kcm/client.c

   1 /*
   2  * Copyright (c) 2005, PADL Software Pty Ltd.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of PADL Software nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "kcm_locl.h"
  34
  35 RCSID("$Id$");
  36
  37 krb5_error_code
  38 kcm_ccache_resolve_client(krb5_context context,
  39                           kcm_client *client,
  40                           kcm_operation opcode,
  41                           const char *name,
  42                           kcm_ccache *ccache)
  43 {
  44     krb5_error_code ret;
  45
  46     ret = kcm_ccache_resolve(context, name, ccache);
  47     if (ret) {
  48         kcm_log(1, "Failed to resolve cache %s: %s",
  49                 name, krb5_get_err_text(context, ret));
  50         return ret;
  51     }
  52
  53     ret = kcm_access(context, client, opcode, *ccache);
  54     if (ret) {
  55         ret = KRB5_FCC_NOFILE; /* don't disclose */
  56         kcm_release_ccache(context, ccache);
  57     }
  58
  59     return ret;
  60 }
  61
  62 krb5_error_code
  63 kcm_ccache_destroy_client(krb5_context context,
  64                           kcm_client *client,
  65                           const char *name)
  66 {
  67     krb5_error_code ret;
  68     kcm_ccache ccache;
  69
  70     ret = kcm_ccache_resolve(context, name, &ccache);
  71     if (ret) {
  72         kcm_log(1, "Failed to resolve cache %s: %s",
  73                 name, krb5_get_err_text(context, ret));
  74         return ret;
  75     }
  76
  77     ret = kcm_access(context, client, KCM_OP_DESTROY, ccache);
  78     if (ret) {
  79         kcm_release_ccache(context, &ccache);
  80         return ret;
  81     }
  82
  83     ret = kcm_ccache_destroy(context, ccache->name);
  84     if (ret == 0) {
  85         /* don't leave any events dangling */
  86         kcm_cleanup_events(context, ccache);
  87     }
  88
  89     kcm_release_ccache(context, &ccache);
  90     return ret;
  91 }
  92
  93 krb5_error_code
  94 kcm_ccache_new_client(krb5_context context,
  95                       kcm_client *client,
  96                       const char *name,
  97                       kcm_ccache *ccache_p)
  98 {
  99     krb5_error_code ret;
 100     kcm_ccache ccache;
 101
 102     /* We insist the ccache name starts with UID or UID: */
 103     if (name_constraints != 0) {
 104         char prefix[64];
 105         size_t prefix_len;
 106         int bad = 1;
 107
 108         snprintf(prefix, sizeof(prefix), "%d:", client->uid);
 109         prefix_len = strlen(prefix);
 110
 111         if (strncmp(name, prefix, prefix_len) == 0)
 112             bad = 0;
 113         else {
 114             prefix[prefix_len - 1] = '\0';
 115             if (strcmp(name, prefix) == 0)
 116                 bad = 0;
 117         }
 118
 119         if (bad)
 120             return KRB5_CC_BADNAME;
 121     }
 122
 123     ret = kcm_ccache_resolve(context, name, &ccache);
 124     if (ret == 0) {
 125         if (ccache->uid != client->uid ||
 126             ccache->gid != client->gid)
 127             return KRB5_FCC_PERM;
 128     } else if (ret != KRB5_FCC_NOFILE) {
 129         return ret;
 130     }
 131
 132     if (ret == KRB5_FCC_NOFILE) {
 133         ret = kcm_ccache_new(context, name, &ccache);
 134         if (ret) {
 135             kcm_log(1, "Failed to initialize cache %s: %s",
 136                     name, krb5_get_err_text(context, ret));
 137             return ret;
 138         }
 139
 140         /* bind to current client */
 141         ccache->uid = client->uid;
 142         ccache->gid = client->gid;
 143     } else {
 144         ret = kcm_zero_ccache_data(context, ccache);
 145         if (ret) {
 146             kcm_log(1, "Failed to empty cache %s: %s",
 147                     name, krb5_get_err_text(context, ret));
 148             kcm_release_ccache(context, &ccache);
 149             return ret;
 150         }
 151         kcm_cleanup_events(context, ccache);
 152     }
 153
 154     ret = kcm_access(context, client, KCM_OP_INITIALIZE, ccache);
 155     if (ret) {
 156         kcm_release_ccache(context, &ccache);
 157         kcm_ccache_destroy(context, name);
 158         return ret;
 159     }
 160
 161     *ccache_p = ccache;
 162     return 0;
 163 }
 164