lib/hx509/lock.c

   1 /*
   2  * Copyright (c) 2005 - 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
  36 /**
  37  * @page page_lock Locking and unlocking certificates and encrypted data.
  38  *
  39  * See the library functions here: @ref hx509_lock
  40  */
  41
  42 struct hx509_lock_data {
  43     struct _hx509_password password;
  44     hx509_certs certs;
  45     hx509_prompter_fct prompt;
  46     void *prompt_data;
  47 };
  48
  49 static struct hx509_lock_data empty_lock_data = {
  50     { 0, NULL }
  51 };
  52
  53 hx509_lock _hx509_empty_lock = &empty_lock_data;
  54
  55 /*
  56  *
  57  */
  58
  59 int
  60 hx509_lock_init(hx509_context context, hx509_lock *lock)
  61 {
  62     hx509_lock l;
  63     int ret;
  64
  65     *lock = NULL;
  66
  67     l = calloc(1, sizeof(*l));
  68     if (l == NULL)
  69         return ENOMEM;
  70
  71     ret = hx509_certs_init(context,
  72                            "MEMORY:locks-internal",
  73                            0,
  74                            NULL,
  75                            &l->certs);
  76     if (ret) {
  77         free(l);
  78         return ret;
  79     }
  80
  81     *lock = l;
  82
  83     return 0;
  84 }
  85
  86 int
  87 hx509_lock_add_password(hx509_lock lock, const char *password)
  88 {
  89     void *d;
  90     char *s;
  91
  92     s = strdup(password);
  93     if (s == NULL)
  94         return ENOMEM;
  95
  96     d = realloc(lock->password.val,
  97                 (lock->password.len + 1) * sizeof(lock->password.val[0]));
  98     if (d == NULL) {
  99         free(s);
 100         return ENOMEM;
 101     }
 102     lock->password.val = d;
 103     lock->password.val[lock->password.len] = s;
 104     lock->password.len++;
 105
 106     return 0;
 107 }
 108
 109 const struct _hx509_password *
 110 _hx509_lock_get_passwords(hx509_lock lock)
 111 {
 112     return &lock->password;
 113 }
 114
 115 hx509_certs
 116 _hx509_lock_unlock_certs(hx509_lock lock)
 117 {
 118     return lock->certs;
 119 }
 120
 121 void
 122 hx509_lock_reset_passwords(hx509_lock lock)
 123 {
 124     int i;
 125     for (i = 0; i < lock->password.len; i++)
 126         free(lock->password.val[i]);
 127     free(lock->password.val);
 128     lock->password.val = NULL;
 129     lock->password.len = 0;
 130 }
 131
 132 int
 133 hx509_lock_add_cert(hx509_context context, hx509_lock lock, hx509_cert cert)
 134 {
 135     return hx509_certs_add(context, lock->certs, cert);
 136 }
 137
 138 int
 139 hx509_lock_add_certs(hx509_context context, hx509_lock lock, hx509_certs certs)
 140 {
 141     return hx509_certs_merge(context, lock->certs, certs);
 142 }
 143
 144 void
 145 hx509_lock_reset_certs(hx509_context context, hx509_lock lock)
 146 {
 147     hx509_certs certs = lock->certs;
 148     int ret;
 149
 150     ret = hx509_certs_init(context,
 151                            "MEMORY:locks-internal",
 152                            0,
 153                            NULL,
 154                            &lock->certs);
 155     if (ret == 0)
 156         hx509_certs_free(&certs);
 157     else
 158         lock->certs = certs;
 159 }
 160
 161 int
 162 _hx509_lock_find_cert(hx509_lock lock, const hx509_query *q, hx509_cert *c)
 163 {
 164     *c = NULL;
 165     return 0;
 166 }
 167
 168 int
 169 hx509_lock_set_prompter(hx509_lock lock, hx509_prompter_fct prompt, void *data)
 170 {
 171     lock->prompt = prompt;
 172     lock->prompt_data = data;
 173     return 0;
 174 }
 175
 176 void
 177 hx509_lock_reset_promper(hx509_lock lock)
 178 {
 179     lock->prompt = NULL;
 180     lock->prompt_data = NULL;
 181 }
 182
 183 static int
 184 default_prompter(void *data, const hx509_prompt *prompter)
 185 {
 186     if (hx509_prompt_hidden(prompter->type)) {
 187         if(UI_UTIL_read_pw_string(prompter->reply.data,
 188                                   prompter->reply.length,
 189                                   prompter->prompt,
 190                                   0))
 191             return 1;
 192     } else {
 193         char *s = prompter->reply.data;
 194
 195         fputs (prompter->prompt, stdout);
 196         fflush (stdout);
 197         if(fgets(prompter->reply.data,
 198                  prompter->reply.length,
 199                  stdin) == NULL)
 200             return 1;
 201         s[strcspn(s, "\n")] = '\0';
 202     }
 203     return 0;
 204 }
 205
 206 int
 207 hx509_lock_prompt(hx509_lock lock, hx509_prompt *prompt)
 208 {
 209     if (lock->prompt == NULL)
 210         return HX509_CRYPTO_NO_PROMPTER;
 211     return (*lock->prompt)(lock->prompt_data, prompt);
 212 }
 213
 214 void
 215 hx509_lock_free(hx509_lock lock)
 216 {
 217     hx509_certs_free(&lock->certs);
 218     hx509_lock_reset_passwords(lock);
 219     memset(lock, 0, sizeof(*lock));
 220     free(lock);
 221 }
 222
 223 int
 224 hx509_prompt_hidden(hx509_prompt_type type)
 225 {
 226     /* default to hidden if unknown */
 227
 228     switch (type) {
 229     case HX509_PROMPT_TYPE_QUESTION:
 230     case HX509_PROMPT_TYPE_INFO:
 231         return 0;
 232     default:
 233         return 1;
 234     }
 235 }
 236
 237 int
 238 hx509_lock_command_string(hx509_lock lock, const char *string)
 239 {
 240     if (strncasecmp(string, "PASS:", 5) == 0) {
 241         hx509_lock_add_password(lock, string + 5);
 242     } else if (strcasecmp(string, "PROMPT") == 0) {
 243         hx509_lock_set_prompter(lock, default_prompter, NULL);
 244     } else
 245         return HX509_UNKNOWN_LOCK_COMMAND;
 246     return 0;
 247 }