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 static int
  97 dir_iter_start(hx509_context context,
  98                hx509_certs certs, void *data, void **cursor)
  99 {
 100     struct dircursor *d;
 101
 102     *cursor = NULL;
 103
 104     d = calloc(1, sizeof(*d));
 105     if (d == NULL) {
 106         hx509_clear_error_string(context);
 107         return ENOMEM;
 108     }
 109
 110     d->dir = opendir(data);
 111     if (d->dir == NULL) {
 112         hx509_clear_error_string(context);
 113         free(d);
 114         return errno;
 115     }
 116     rk_cloexec_dir(d->dir);
 117     d->certs = NULL;
 118     d->iter = NULL;
 119
 120     *cursor = d;
 121     return 0;
 122 }
 123
 124 static int
 125 dir_iter(hx509_context context,
 126          hx509_certs certs, void *data, void *iter, hx509_cert *cert)
 127 {
 128     struct dircursor *d = iter;
 129     int ret = 0;
 130
 131     *cert = NULL;
 132
 133     do {
 134         struct dirent *dir;
 135         char *fn;
 136
 137         if (d->certs) {
 138             ret = hx509_certs_next_cert(context, d->certs, d->iter, cert);
 139             if (ret) {
 140                 hx509_certs_end_seq(context, d->certs, d->iter);
 141                 d->iter = NULL;
 142                 hx509_certs_free(&d->certs);
 143                 return ret;
 144             }
 145             if (*cert) {
 146                 ret = 0;
 147                 break;
 148             }
 149             hx509_certs_end_seq(context, d->certs, d->iter);
 150             d->iter = NULL;
 151             hx509_certs_free(&d->certs);
 152         }
 153
 154         dir = readdir(d->dir);
 155         if (dir == NULL) {
 156             ret = 0;
 157             break;
 158         }
 159         if (strcmp(dir->d_name, ".") == 0 || strcmp(dir->d_name, "..") == 0)
 160             continue;
 161
 162         if (asprintf(&fn, "FILE:%s/%s", (char *)data, dir->d_name) == -1)
 163             return ENOMEM;
 164
 165         ret = hx509_certs_init(context, fn, 0, NULL, &d->certs);
 166         if (ret == 0) {
 167
 168             ret = hx509_certs_start_seq(context, d->certs, &d->iter);
 169             if (ret)
 170             hx509_certs_free(&d->certs);
 171         }
 172         /* ignore errors */
 173         if (ret) {
 174             d->certs = NULL;
 175             ret = 0;
 176         }
 177
 178         free(fn);
 179     } while(ret == 0);
 180
 181     return ret;
 182 }
 183
 184
 185 static int
 186 dir_iter_end(hx509_context context,
 187              hx509_certs certs,
 188              void *data,
 189              void *cursor)
 190 {
 191     struct dircursor *d = cursor;
 192
 193     if (d->certs) {
 194         hx509_certs_end_seq(context, d->certs, d->iter);
 195         d->iter = NULL;
 196         hx509_certs_free(&d->certs);
 197     }
 198     closedir(d->dir);
 199     free(d);
 200     return 0;
 201 }
 202
 203
 204 static struct hx509_keyset_ops keyset_dir = {
 205     "DIR",
 206     0,
 207     dir_init,
 208     NULL,
 209     dir_free,
 210     NULL,
 211     NULL,
 212     dir_iter_start,
 213     dir_iter,
 214     dir_iter_end
 215 };
 216
 217 void
 218 _hx509_ks_dir_register(hx509_context context)
 219 {
 220     _hx509_ks_register(context, &keyset_dir);
 221 }