lib/hcrypto/engine.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 <config.h>
  35
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include <engine.h>
  41
  42 #ifdef HAVE_DLFCN_H
  43 #include <dlfcn.h>
  44 #ifndef RTLD_NOW
  45 #define RTLD_NOW 0
  46 #endif
  47 #endif
  48
  49 struct hc_engine {
  50     int references;
  51     char *name;
  52     char *id;
  53     void (*destroy)(ENGINE *);
  54     const RSA_METHOD *rsa;
  55     const DH_METHOD *dh;
  56     const RAND_METHOD *rand;
  57 };
  58
  59 ENGINE  *
  60 ENGINE_new(void)
  61 {
  62     ENGINE *engine;
  63
  64     engine = calloc(1, sizeof(*engine));
  65     engine->references = 1;
  66
  67     return engine;
  68 }
  69
  70 int
  71 ENGINE_free(ENGINE *engine)
  72 {
  73 }
  74
  75
  76 int
  77 ENGINE_finish(ENGINE *engine)
  78 {
  79     if (engine->references-- <= 0)
  80         abort();
  81     if (engine->references > 0)
  82         return 1;
  83
  84     if (engine->name)
  85         free(engine->name);
  86     if (engine->id)
  87         free(engine->id);
  88     if(engine->destroy)
  89         (*engine->destroy)(engine);
  90
  91     memset(engine, 0, sizeof(engine));
  92     engine->references = -1;
  93
  94
  95     free(engine);
  96     return 1;
  97 }
  98
  99 int
 100 ENGINE_up_ref(ENGINE *engine)
 101 {
 102     if (engine->references < 0)
 103         abort();
 104     engine->references++;
 105     return 1;
 106 }
 107
 108 int
 109 ENGINE_set_id(ENGINE *engine, const char *id)
 110 {
 111     engine->id = strdup(id);
 112     return (engine->id == NULL) ? 0 : 1;
 113 }
 114
 115 int
 116 ENGINE_set_name(ENGINE *engine, const char *name)
 117 {
 118     engine->name = strdup(name);
 119     return (engine->name == NULL) ? 0 : 1;
 120 }
 121
 122 int
 123 ENGINE_set_RSA(ENGINE *engine, const RSA_METHOD *method)
 124 {
 125     engine->rsa = method;
 126     return 1;
 127 }
 128
 129 int
 130 ENGINE_set_DH(ENGINE *engine, const DH_METHOD *method)
 131 {
 132     engine->dh = method;
 133     return 1;
 134 }
 135
 136 int
 137 ENGINE_set_destroy_function(ENGINE *e, void (*destroy)(ENGINE *))
 138 {
 139     e->destroy = destroy;
 140     return 1;
 141 }
 142
 143 const char *
 144 ENGINE_get_id(const ENGINE *engine)
 145 {
 146     return engine->id;
 147 }
 148
 149 const char *
 150 ENGINE_get_name(const ENGINE *engine)
 151 {
 152     return engine->name;
 153 }
 154
 155 const RSA_METHOD *
 156 ENGINE_get_RSA(const ENGINE *engine)
 157 {
 158     return engine->rsa;
 159 }
 160
 161 const DH_METHOD *
 162 ENGINE_get_DH(const ENGINE *engine)
 163 {
 164     return engine->dh;
 165 }
 166
 167 const RAND_METHOD *
 168 ENGINE_get_RAND(const ENGINE *engine)
 169 {
 170     return engine->rand;
 171 }
 172
 173 /*
 174  *
 175  */
 176
 177 #define SG_default_engine(type)                 \
 178 static ENGINE *type##_engine;                   \
 179 int                                             \
 180 ENGINE_set_default_##type(ENGINE *engine)       \
 181 {                                               \
 182     if (type##_engine)                          \
 183         ENGINE_finish(type##_engine);           \
 184     type##_engine = engine;                     \
 185     if (type##_engine)                          \
 186         ENGINE_up_ref(type##_engine);           \
 187     return 1;                                   \
 188 }                                               \
 189 ENGINE *                                        \
 190 ENGINE_get_default_##type(void)                 \
 191 {                                               \
 192     if (type##_engine)                          \
 193         ENGINE_up_ref(type##_engine);           \
 194     return type##_engine;                       \
 195 }
 196
 197 SG_default_engine(RSA)
 198 SG_default_engine(DH)
 199
 200 #undef SG_default_engine
 201
 202 /*
 203  *
 204  */
 205
 206 static ENGINE **engines;
 207 static unsigned int num_engines;
 208
 209 static int
 210 add_engine(ENGINE *engine)
 211 {
 212     ENGINE **d, *dup;
 213
 214     dup = ENGINE_by_id(engine->id);
 215     if (dup)
 216         return 0;
 217
 218     d = realloc(engines, (num_engines + 1) * sizeof(*engines));
 219     if (d == NULL)
 220         return 1;
 221     engines = d;
 222     engines[num_engines++] = engine;
 223
 224     return 1;
 225 }
 226
 227 void
 228 ENGINE_load_builtin_engines(void)
 229 {
 230     ENGINE *engine;
 231     int ret;
 232
 233     engine = ENGINE_new();
 234     if (engine == NULL)
 235         return;
 236
 237     ENGINE_set_id(engine, "builtin");
 238     ENGINE_set_name(engine,
 239                     "Heimdal crypto builtin engine version " PACKAGE_VERSION);
 240     ENGINE_set_RSA(engine, RSA_tfm_method());
 241     ENGINE_set_DH(engine, DH_tfm_method());
 242
 243     ret = add_engine(engine);
 244     if (ret != 1)
 245         ENGINE_finish(engine);
 246
 247     /*
 248      * TFM
 249      */
 250
 251     engine = ENGINE_new();
 252     if (engine == NULL)
 253         return;
 254
 255     ENGINE_set_id(engine, "tfm");
 256     ENGINE_set_name(engine,
 257                     "Heimdal crypto tfm engine version " PACKAGE_VERSION);
 258     ENGINE_set_RSA(engine, RSA_tfm_method());
 259     ENGINE_set_DH(engine, DH_tfm_method());
 260
 261     ret = add_engine(engine);
 262     if (ret != 1)
 263         ENGINE_finish(engine);
 264
 265     /*
 266      * imath
 267      */
 268
 269     engine = ENGINE_new();
 270     if (engine == NULL)
 271         return;
 272
 273     ENGINE_set_id(engine, "imath");
 274     ENGINE_set_name(engine,
 275                     "Heimdal crypto imath engine version " PACKAGE_VERSION);
 276     ENGINE_set_RSA(engine, RSA_imath_method());
 277     ENGINE_set_DH(engine, DH_imath_method());
 278
 279     ret = add_engine(engine);
 280     if (ret != 1)
 281         ENGINE_finish(engine);
 282
 283 }
 284
 285 ENGINE *
 286 ENGINE_by_dso(const char *path, const char *id)
 287 {
 288 #ifdef HAVE_DLOPEN
 289     ENGINE *engine;
 290     void *handle;
 291     int ret;
 292
 293     engine = calloc(1, sizeof(*engine));
 294     if (engine == NULL)
 295         return NULL;
 296
 297     handle = dlopen(path, RTLD_NOW);
 298     if (handle == NULL) {
 299         /* printf("error: %s\n", dlerror()); */
 300         free(engine);
 301         return NULL;
 302     }
 303
 304     {
 305         unsigned long version;
 306         openssl_v_check v_check;
 307
 308         v_check = (openssl_v_check)dlsym(handle, "v_check");
 309         if (v_check == NULL) {
 310             dlclose(handle);
 311             free(engine);
 312             return NULL;
 313         }
 314
 315         version = (*v_check)(OPENSSL_DYNAMIC_VERSION);
 316         if (version == 0) {
 317             dlclose(handle);
 318             free(engine);
 319             return NULL;
 320         }
 321     }
 322
 323     {
 324         openssl_bind_engine bind_engine;
 325
 326         bind_engine = (openssl_bind_engine)dlsym(handle, "bind_engine");
 327         if (bind_engine == NULL) {
 328             dlclose(handle);
 329             free(engine);
 330             return NULL;
 331         }
 332
 333         ret = (*bind_engine)(engine, id, NULL); /* XXX fix third arg */
 334         if (ret != 1) {
 335             dlclose(handle);
 336             free(engine);
 337             return NULL;
 338         }
 339     }
 340
 341     ENGINE_up_ref(engine);
 342
 343     ret = add_engine(engine);
 344     if (ret != 1) {
 345         dlclose(handle);
 346         ENGINE_finish(engine);
 347         return NULL;
 348     }
 349
 350     return engine;
 351 #else
 352     return NULL;
 353 #endif
 354 }
 355
 356 ENGINE *
 357 ENGINE_by_id(const char *id)
 358 {
 359     int i;
 360
 361     for (i = 0; i < num_engines; i++) {
 362         if (strcmp(id, engines[i]->id) == 0) {
 363             ENGINE_up_ref(engines[i]);
 364             return engines[i];
 365         }
 366     }
 367     return NULL;
 368 }
 369
 370 void
 371 ENGINE_add_conf_module(void)
 372 {
 373 }