crypto/dist/heimdal/kcm/cursor.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("$Heimdal: cursor.c 17447 2006-05-05 10:52:01Z lha $"
  36         "$NetBSD$");
  37
  38 krb5_error_code
  39 kcm_cursor_new(krb5_context context,
  40                pid_t pid,
  41                kcm_ccache ccache,
  42                uint32_t *cursor)
  43 {
  44     kcm_cursor **p;
  45     krb5_error_code ret;
  46
  47     *cursor = 0;
  48
  49     KCM_ASSERT_VALID(ccache);
  50
  51     HEIMDAL_MUTEX_lock(&ccache->mutex);
  52     for (p = &ccache->cursors; *p != NULL; p = &(*p)->next)
  53         ;
  54
  55     *p = (kcm_cursor *)malloc(sizeof(kcm_cursor));
  56     if (*p == NULL) {
  57         ret = KRB5_CC_NOMEM;
  58         goto out;
  59     }
  60
  61     (*p)->pid = pid;
  62     (*p)->key = ++ccache->n_cursor;
  63     (*p)->credp = ccache->creds;
  64     (*p)->next = NULL;
  65
  66     *cursor = (*p)->key;
  67
  68     ret = 0;
  69
  70 out:
  71     HEIMDAL_MUTEX_unlock(&ccache->mutex);
  72
  73     return ret;
  74 }
  75
  76 krb5_error_code
  77 kcm_cursor_find(krb5_context context,
  78                 pid_t pid,
  79                 kcm_ccache ccache,
  80                 uint32_t key,
  81                 kcm_cursor **cursor)
  82 {
  83     kcm_cursor *p;
  84     krb5_error_code ret;
  85
  86     KCM_ASSERT_VALID(ccache);
  87
  88     if (key == 0)
  89         return KRB5_CC_NOTFOUND;
  90
  91     ret = KRB5_CC_END;
  92
  93     HEIMDAL_MUTEX_lock(&ccache->mutex);
  94
  95     for (p = ccache->cursors; p != NULL; p = p->next) {
  96         if (p->key == key) {
  97             if (p->pid != pid)
  98                 ret = KRB5_FCC_PERM;
  99             else
 100                 ret = 0;
 101             break;
 102         }
 103     }
 104
 105     if (ret == 0)
 106         *cursor = p;
 107
 108     HEIMDAL_MUTEX_unlock(&ccache->mutex);
 109
 110     return ret;
 111 }
 112
 113 krb5_error_code
 114 kcm_cursor_delete(krb5_context context,
 115                   pid_t pid,
 116                   kcm_ccache ccache,
 117                   uint32_t key)
 118 {
 119     kcm_cursor **p;
 120     krb5_error_code ret;
 121
 122     KCM_ASSERT_VALID(ccache);
 123
 124     if (key == 0)
 125         return KRB5_CC_NOTFOUND;
 126
 127     ret = KRB5_CC_END;
 128
 129     HEIMDAL_MUTEX_lock(&ccache->mutex);
 130
 131     for (p = &ccache->cursors; *p != NULL; p = &(*p)->next) {
 132         if ((*p)->key == key) {
 133             if ((*p)->pid != pid)
 134                 ret = KRB5_FCC_PERM;
 135             else
 136                 ret = 0;
 137             break;
 138         }
 139     }
 140
 141     if (ret == 0) {
 142         kcm_cursor *x = *p;
 143
 144         *p = x->next;
 145         free(x);
 146     }
 147
 148     HEIMDAL_MUTEX_unlock(&ccache->mutex);
 149
 150     return ret;
 151 }
 152