lib/hx509/ks_dir.c

   1 /*
   2  * Copyright (c) 2006 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 "hx_locl.h"
  35 #include <dirent.h>
  36
  37 /*
  38  * The DIR keyset module is strange compared to the other modules
  39  * since it does lazy evaluation and really doesn't keep any local
  40  * state except for the directory iteration and cert iteration of
  41  * files. DIR ignores most errors so that the consumer doesn't get
  42  * failes for stray files in directories.
  43  */
  44
  45 struct dircursor {
  46     DIR *dir;
  47     hx509_certs certs;
  48     void *iter;
  49 };
  50
  51 /*
  52  *
  53  */
  54
  55 static int
  56 dir_init(hx509_context context,
  57          hx509_certs certs, void **data, int flags,
  58          const char *residue, hx509_lock lock)
  59 {
  60     *data = NULL;
  61
  62     {
  63         struct stat sb;
  64         int ret;
  65
  66         ret = stat(residue, &sb);
  67         if (ret == -1) {
  68             hx509_set_error_string(context, 0, ENOENT,
  69                                    "No such file %s", residue);
  70             return ENOENT;
  71         }
  72
  73         if (!S_ISDIR(sb.st_mode)) {
  74             hx509_set_error_string(context, 0, ENOTDIR,
  75                                    "%s is not a directory", residue);
  76             return ENOTDIR;
  77         }
  78     }
  79
  80     *data = strdup(residue);
  81     if (*data == NULL) {
  82         hx509_clear_error_string(context);
  83         return ENOMEM;
  84     }
  85
  86     return 0;
  87 }
  88
  89 static int
  90 dir_free(hx509_certs certs, void *data)
  91 {
  92     free(data);
  93     return 0;
  94 }
  95
  96
  97
  98 static int
  99 dir_iter_start(hx509_context context,
 100                hx509_certs certs, void *data, void **cursor)
 101 {
 102     struct dircursor *d;
 103
 104     *cursor = NULL;
 105
 106     d = calloc(1, sizeof(*d));
 107     if (d == NULL) {
 108         hx509_clear_error_string(context);
 109         return ENOMEM;
 110     }
 111
 112     d->dir = opendir(data);
 113     if (d->dir == NULL) {
 114         hx509_clear_error_string(context);
 115         free(d);
 116         return errno;
 117     }
 118     rk_cloexec(dirfd(d->dir));
 119     d->certs = NULL;
 120     d->iter = NULL;
 121
 122     *cursor = d;
 123     return 0;
 124 }
 125
 126 static int
 127 dir_iter(hx509_context context,
 128          hx509_certs certs, void *data, void *iter, hx509_cert *cert)
 129 {
 130     struct dircursor *d = iter;
 131     int ret = 0;
 132
 133     *cert = NULL;
 134
 135     do {
 136         struct dirent *dir;
 137         char *fn;
 138
 139         if (d->certs) {
 140             ret = hx509_certs_next_cert(context, d->certs, d->iter, cert);
 141             if (ret) {
 142                 hx509_certs_end_seq(context, d->certs, d->iter);
 143                 d->iter = NULL;
 144                 hx509_certs_free(&d->certs);
 145                 return ret;
 146             }
 147             if (*cert) {
 148                 ret = 0;
 149                 break;
 150             }
 151             hx509_certs_end_seq(context, d->certs, d->iter);
 152             d->iter = NULL;
 153             hx509_certs_free(&d->certs);
 154         }
 155
 156         dir = readdir(d->dir);
 157         if (dir == NULL) {
 158             ret = 0;
 159             break;
 160         }
 161         if (strcmp(dir->d_name, ".") == 0 || strcmp(dir->d_name, "..") == 0)
 162             continue;
 163
 164         if (asprintf(&fn, "FILE:%s/%s", (char *)data, dir->d_name) == -1)
 165             return ENOMEM;
 166
 167         ret = hx509_certs_init(context, fn, 0, NULL, &d->certs);
 168         if (ret == 0) {
 169
 170             ret = hx509_certs_start_seq(context, d->certs, &d->iter);
 171             if (ret)
 172             hx509_certs_free(&d->certs);
 173         }
 174         /* ignore errors */
 175         if (ret) {
 176             d->certs = NULL;
 177             ret = 0;
 178         }
 179
 180         free(fn);
 181     } while(ret == 0);
 182
 183     return ret;
 184 }
 185
 186
 187 static int
 188 dir_iter_end(hx509_context context,
 189              hx509_certs certs,
 190              void *data,
 191              void *cursor)
 192 {
 193     struct dircursor *d = cursor;
 194
 195     if (d->certs) {
 196         hx509_certs_end_seq(context, d->certs, d->iter);
 197         d->iter = NULL;
 198         hx509_certs_free(&d->certs);
 199     }
 200     closedir(d->dir);
 201     free(d);
 202     return 0;
 203 }
 204
 205
 206 static struct hx509_keyset_ops keyset_dir = {
 207     "DIR",
 208     0,
 209     dir_init,
 210     NULL,
 211     dir_free,
 212     NULL,
 213     NULL,
 214     dir_iter_start,
 215     dir_iter,
 216     dir_iter_end
 217 };
 218
 219 void
 220 _hx509_ks_dir_register(hx509_context context)
 221 {
 222     _hx509_ks_register(context, &keyset_dir);
 223 }