1/* Licensed to the Apache Software Foundation (ASF) under one or more 2 * contributor license agreements. See the NOTICE file distributed with 3 * this work for additional information regarding copyright ownership. 4 * The ASF licenses this file to You under the Apache License, Version 2.0 5 * (the "License"); you may not use this file except in compliance with 6 * the License. You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include <ctype.h> 18#include <stdio.h> 19 20#include "apu_config.h" 21#include "apu.h" 22#include "apr_pools.h" 23#include "apr_dso.h" 24#include "apr_strings.h" 25#include "apr_hash.h" 26#include "apr_thread_mutex.h" 27#include "apr_lib.h" 28 29#if APU_HAVE_CRYPTO 30 31#include "apu_internal.h" 32#include "apr_crypto_internal.h" 33#include "apr_crypto.h" 34#include "apu_version.h" 35 36static apr_hash_t *drivers = NULL; 37 38#define ERROR_SIZE 1024 39 40#define CLEANUP_CAST (apr_status_t (*)(void*)) 41 42#define APR_TYPEDEF_STRUCT(type, incompletion) \ 43struct type { \ 44 incompletion \ 45 void *unk[]; \ 46}; 47 48APR_TYPEDEF_STRUCT(apr_crypto_t, 49 apr_pool_t *pool; 50 apr_crypto_driver_t *provider; 51) 52 53APR_TYPEDEF_STRUCT(apr_crypto_key_t, 54 apr_pool_t *pool; 55 apr_crypto_driver_t *provider; 56 const apr_crypto_t *f; 57) 58 59APR_TYPEDEF_STRUCT(apr_crypto_block_t, 60 apr_pool_t *pool; 61 apr_crypto_driver_t *provider; 62 const apr_crypto_t *f; 63) 64 65typedef struct apr_crypto_clear_t { 66 void *buffer; 67 apr_size_t size; 68} apr_crypto_clear_t; 69 70#if !APU_DSO_BUILD 71#define DRIVER_LOAD(name,driver_name,pool,params,rv,result) \ 72 { \ 73 extern const apr_crypto_driver_t driver_name; \ 74 apr_hash_set(drivers,name,APR_HASH_KEY_STRING,&driver_name); \ 75 if (driver_name.init) { \ 76 rv = driver_name.init(pool, params, result); \ 77 } \ 78 *driver = &driver_name; \ 79 } 80#endif 81 82static apr_status_t apr_crypto_term(void *ptr) 83{ 84 /* set drivers to NULL so init can work again */ 85 drivers = NULL; 86 87 /* Everything else we need is handled by cleanups registered 88 * when we created mutexes and loaded DSOs 89 */ 90 return APR_SUCCESS; 91} 92 93APU_DECLARE(apr_status_t) apr_crypto_init(apr_pool_t *pool) 94{ 95 apr_status_t ret = APR_SUCCESS; 96 apr_pool_t *parent; 97 98 if (drivers != NULL) { 99 return APR_SUCCESS; 100 } 101 102 /* Top level pool scope, need process-scope lifetime */ 103 for (parent = pool; parent; parent = apr_pool_parent_get(pool)) 104 pool = parent; 105#if APU_DSO_BUILD 106 /* deprecate in 2.0 - permit implicit initialization */ 107 apu_dso_init(pool); 108#endif 109 drivers = apr_hash_make(pool); 110 111 apr_pool_cleanup_register(pool, NULL, apr_crypto_term, 112 apr_pool_cleanup_null); 113 114 return ret; 115} 116 117static apr_status_t crypto_clear(void *ptr) 118{ 119 apr_crypto_clear_t *clear = (apr_crypto_clear_t *)ptr; 120 121 memset(clear->buffer, 0, clear->size); 122 clear->buffer = NULL; 123 clear->size = 0; 124 125 return APR_SUCCESS; 126} 127 128APU_DECLARE(apr_status_t) apr_crypto_clear(apr_pool_t *pool, 129 void *buffer, apr_size_t size) 130{ 131 apr_crypto_clear_t *clear = apr_palloc(pool, sizeof(apr_crypto_clear_t)); 132 133 clear->buffer = buffer; 134 clear->size = size; 135 136 apr_pool_cleanup_register(pool, clear, crypto_clear, 137 apr_pool_cleanup_null); 138 139 return APR_SUCCESS; 140} 141 142APU_DECLARE(apr_status_t) apr_crypto_get_driver( 143 const apr_crypto_driver_t **driver, const char *name, 144 const char *params, const apu_err_t **result, apr_pool_t *pool) 145{ 146#if APU_DSO_BUILD 147 char modname[32]; 148 char symname[34]; 149 apr_dso_handle_t *dso; 150 apr_dso_handle_sym_t symbol; 151#endif 152 apr_status_t rv; 153 154 if (result) { 155 *result = NULL; /* until further notice */ 156 } 157 158#if APU_DSO_BUILD 159 rv = apu_dso_mutex_lock(); 160 if (rv) { 161 return rv; 162 } 163#endif 164 *driver = apr_hash_get(drivers, name, APR_HASH_KEY_STRING); 165 if (*driver) { 166#if APU_DSO_BUILD 167 apu_dso_mutex_unlock(); 168#endif 169 return APR_SUCCESS; 170 } 171 172#if APU_DSO_BUILD 173 /* The driver DSO must have exactly the same lifetime as the 174 * drivers hash table; ignore the passed-in pool */ 175 pool = apr_hash_pool_get(drivers); 176 177#if defined(NETWARE) 178 apr_snprintf(modname, sizeof(modname), "crypto%s.nlm", name); 179#elif defined(WIN32) 180 apr_snprintf(modname, sizeof(modname), 181 "apr_crypto_%s-" APU_STRINGIFY(APU_MAJOR_VERSION) ".dll", name); 182#else 183 apr_snprintf(modname, sizeof(modname), 184 "apr_crypto_%s-" APU_STRINGIFY(APU_MAJOR_VERSION) ".so", name); 185#endif 186 apr_snprintf(symname, sizeof(symname), "apr_crypto_%s_driver", name); 187 rv = apu_dso_load(&dso, &symbol, modname, symname, pool); 188 if (rv == APR_SUCCESS || rv == APR_EINIT) { /* previously loaded?!? */ 189 *driver = symbol; 190 name = apr_pstrdup(pool, name); 191 apr_hash_set(drivers, name, APR_HASH_KEY_STRING, *driver); 192 rv = APR_SUCCESS; 193 if ((*driver)->init) { 194 rv = (*driver)->init(pool, params, result); 195 } 196 } 197 apu_dso_mutex_unlock(); 198 199 if (APR_SUCCESS != rv && result && !*result) { 200 char *buffer = apr_pcalloc(pool, ERROR_SIZE); 201 apu_err_t *err = apr_pcalloc(pool, sizeof(apu_err_t)); 202 if (err && buffer) { 203 apr_dso_error(dso, buffer, ERROR_SIZE - 1); 204 err->msg = buffer; 205 err->reason = modname; 206 *result = err; 207 } 208 } 209 210#else /* not builtin and !APR_HAS_DSO => not implemented */ 211 rv = APR_ENOTIMPL; 212 213 /* Load statically-linked drivers: */ 214#if APU_HAVE_OPENSSL 215 if (name[0] == 'o' && !strcmp(name, "openssl")) { 216 DRIVER_LOAD("openssl", apr_crypto_openssl_driver, pool, params, rv, result); 217 } 218#endif 219#if APU_HAVE_NSS 220 if (name[0] == 'n' && !strcmp(name, "nss")) { 221 DRIVER_LOAD("nss", apr_crypto_nss_driver, pool, params, rv, result); 222 } 223#endif 224#if APU_HAVE_MSCAPI 225 if (name[0] == 'm' && !strcmp(name, "mscapi")) { 226 DRIVER_LOAD("mscapi", apr_crypto_mscapi_driver, pool, params, rv, result); 227 } 228#endif 229#if APU_HAVE_MSCNG 230 if (name[0] == 'm' && !strcmp(name, "mscng")) { 231 DRIVER_LOAD("mscng", apr_crypto_mscng_driver, pool, params, rv, result); 232 } 233#endif 234 235#endif 236 237 return rv; 238} 239 240/** 241 * @brief Return the name of the driver. 242 * 243 * @param driver - The driver in use. 244 * @return The name of the driver. 245 */ 246APU_DECLARE(const char *)apr_crypto_driver_name ( 247 const apr_crypto_driver_t *driver) 248{ 249 return driver->name; 250} 251 252/** 253 * @brief Get the result of the last operation on a context. If the result 254 * is NULL, the operation was successful. 255 * @param result - the result structure 256 * @param f - context pointer 257 * @return APR_SUCCESS for success 258 */ 259APU_DECLARE(apr_status_t) apr_crypto_error(const apu_err_t **result, 260 const apr_crypto_t *f) 261{ 262 return f->provider->error(result, f); 263} 264 265/** 266 * @brief Create a context for supporting encryption. Keys, certificates, 267 * algorithms and other parameters will be set per context. More than 268 * one context can be created at one time. A cleanup will be automatically 269 * registered with the given pool to guarantee a graceful shutdown. 270 * @param f - context pointer will be written here 271 * @param driver - driver to use 272 * @param params - array of key parameters 273 * @param pool - process pool 274 * @return APR_ENOENGINE when the engine specified does not exist. APR_EINITENGINE 275 * if the engine cannot be initialised. 276 * @remarks NSS: currently no params are supported. 277 * @remarks OpenSSL: the params can have "engine" as a key, followed by an equal 278 * sign and a value. 279 */ 280APU_DECLARE(apr_status_t) apr_crypto_make(apr_crypto_t **f, 281 const apr_crypto_driver_t *driver, const char *params, apr_pool_t *pool) 282{ 283 return driver->make(f, driver, params, pool); 284} 285 286/** 287 * @brief Get a hash table of key types, keyed by the name of the type against 288 * an integer pointer constant. 289 * 290 * @param types - hashtable of key types keyed to constants. 291 * @param f - encryption context 292 * @return APR_SUCCESS for success 293 */ 294APU_DECLARE(apr_status_t) apr_crypto_get_block_key_types(apr_hash_t **types, 295 const apr_crypto_t *f) 296{ 297 return f->provider->get_block_key_types(types, f); 298} 299 300/** 301 * @brief Get a hash table of key modes, keyed by the name of the mode against 302 * an integer pointer constant. 303 * 304 * @param modes - hashtable of key modes keyed to constants. 305 * @param f - encryption context 306 * @return APR_SUCCESS for success 307 */ 308APU_DECLARE(apr_status_t) apr_crypto_get_block_key_modes(apr_hash_t **modes, 309 const apr_crypto_t *f) 310{ 311 return f->provider->get_block_key_modes(modes, f); 312} 313 314/** 315 * @brief Create a key from the given passphrase. By default, the PBKDF2 316 * algorithm is used to generate the key from the passphrase. It is expected 317 * that the same pass phrase will generate the same key, regardless of the 318 * backend crypto platform used. The key is cleaned up when the context 319 * is cleaned, and may be reused with multiple encryption or decryption 320 * operations. 321 * @note If *key is NULL, a apr_crypto_key_t will be created from a pool. If 322 * *key is not NULL, *key must point at a previously created structure. 323 * @param key The key returned, see note. 324 * @param ivSize The size of the initialisation vector will be returned, based 325 * on whether an IV is relevant for this type of crypto. 326 * @param pass The passphrase to use. 327 * @param passLen The passphrase length in bytes 328 * @param salt The salt to use. 329 * @param saltLen The salt length in bytes 330 * @param type 3DES_192, AES_128, AES_192, AES_256. 331 * @param mode Electronic Code Book / Cipher Block Chaining. 332 * @param doPad Pad if necessary. 333 * @param iterations Number of iterations to use in algorithm 334 * @param f The context to use. 335 * @param p The pool to use. 336 * @return Returns APR_ENOKEY if the pass phrase is missing or empty, or if a backend 337 * error occurred while generating the key. APR_ENOCIPHER if the type or mode 338 * is not supported by the particular backend. APR_EKEYTYPE if the key type is 339 * not known. APR_EPADDING if padding was requested but is not supported. 340 * APR_ENOTIMPL if not implemented. 341 */ 342APU_DECLARE(apr_status_t) apr_crypto_passphrase(apr_crypto_key_t **key, 343 apr_size_t *ivSize, const char *pass, apr_size_t passLen, 344 const unsigned char * salt, apr_size_t saltLen, 345 const apr_crypto_block_key_type_e type, 346 const apr_crypto_block_key_mode_e mode, const int doPad, 347 const int iterations, const apr_crypto_t *f, apr_pool_t *p) 348{ 349 return f->provider->passphrase(key, ivSize, pass, passLen, salt, saltLen, 350 type, mode, doPad, iterations, f, p); 351} 352 353/** 354 * @brief Initialise a context for encrypting arbitrary data using the given key. 355 * @note If *ctx is NULL, a apr_crypto_block_t will be created from a pool. If 356 * *ctx is not NULL, *ctx must point at a previously created structure. 357 * @param ctx The block context returned, see note. 358 * @param iv Optional initialisation vector. If the buffer pointed to is NULL, 359 * an IV will be created at random, in space allocated from the pool. 360 * If the buffer pointed to is not NULL, the IV in the buffer will be 361 * used. 362 * @param key The key structure to use. 363 * @param blockSize The block size of the cipher. 364 * @param p The pool to use. 365 * @return Returns APR_ENOIV if an initialisation vector is required but not specified. 366 * Returns APR_EINIT if the backend failed to initialise the context. Returns 367 * APR_ENOTIMPL if not implemented. 368 */ 369APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_init( 370 apr_crypto_block_t **ctx, const unsigned char **iv, 371 const apr_crypto_key_t *key, apr_size_t *blockSize, apr_pool_t *p) 372{ 373 return key->provider->block_encrypt_init(ctx, iv, key, blockSize, p); 374} 375 376/** 377 * @brief Encrypt data provided by in, write it to out. 378 * @note The number of bytes written will be written to outlen. If 379 * out is NULL, outlen will contain the maximum size of the 380 * buffer needed to hold the data, including any data 381 * generated by apr_crypto_block_encrypt_finish below. If *out points 382 * to NULL, a buffer sufficiently large will be created from 383 * the pool provided. If *out points to a not-NULL value, this 384 * value will be used as a buffer instead. 385 * @param out Address of a buffer to which data will be written, 386 * see note. 387 * @param outlen Length of the output will be written here. 388 * @param in Address of the buffer to read. 389 * @param inlen Length of the buffer to read. 390 * @param ctx The block context to use. 391 * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if 392 * not implemented. 393 */ 394APU_DECLARE(apr_status_t) apr_crypto_block_encrypt(unsigned char **out, 395 apr_size_t *outlen, const unsigned char *in, apr_size_t inlen, 396 apr_crypto_block_t *ctx) 397{ 398 return ctx->provider->block_encrypt(out, outlen, in, inlen, ctx); 399} 400 401/** 402 * @brief Encrypt final data block, write it to out. 403 * @note If necessary the final block will be written out after being 404 * padded. Typically the final block will be written to the 405 * same buffer used by apr_crypto_block_encrypt, offset by the 406 * number of bytes returned as actually written by the 407 * apr_crypto_block_encrypt() call. After this call, the context 408 * is cleaned and can be reused by apr_crypto_block_encrypt_init(). 409 * @param out Address of a buffer to which data will be written. This 410 * buffer must already exist, and is usually the same 411 * buffer used by apr_evp_crypt(). See note. 412 * @param outlen Length of the output will be written here. 413 * @param ctx The block context to use. 414 * @return APR_ECRYPT if an error occurred. 415 * @return APR_EPADDING if padding was enabled and the block was incorrectly 416 * formatted. 417 * @return APR_ENOTIMPL if not implemented. 418 */ 419APU_DECLARE(apr_status_t) apr_crypto_block_encrypt_finish(unsigned char *out, 420 apr_size_t *outlen, apr_crypto_block_t *ctx) 421{ 422 return ctx->provider->block_encrypt_finish(out, outlen, ctx); 423} 424 425/** 426 * @brief Initialise a context for decrypting arbitrary data using the given key. 427 * @note If *ctx is NULL, a apr_crypto_block_t will be created from a pool. If 428 * *ctx is not NULL, *ctx must point at a previously created structure. 429 * @param ctx The block context returned, see note. 430 * @param blockSize The block size of the cipher. 431 * @param iv Optional initialisation vector. 432 * @param key The key structure to use. 433 * @param p The pool to use. 434 * @return Returns APR_ENOIV if an initialisation vector is required but not specified. 435 * Returns APR_EINIT if the backend failed to initialise the context. Returns 436 * APR_ENOTIMPL if not implemented. 437 */ 438APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_init( 439 apr_crypto_block_t **ctx, apr_size_t *blockSize, 440 const unsigned char *iv, const apr_crypto_key_t *key, apr_pool_t *p) 441{ 442 return key->provider->block_decrypt_init(ctx, blockSize, iv, key, p); 443} 444 445/** 446 * @brief Decrypt data provided by in, write it to out. 447 * @note The number of bytes written will be written to outlen. If 448 * out is NULL, outlen will contain the maximum size of the 449 * buffer needed to hold the data, including any data 450 * generated by apr_crypto_block_decrypt_finish below. If *out points 451 * to NULL, a buffer sufficiently large will be created from 452 * the pool provided. If *out points to a not-NULL value, this 453 * value will be used as a buffer instead. 454 * @param out Address of a buffer to which data will be written, 455 * see note. 456 * @param outlen Length of the output will be written here. 457 * @param in Address of the buffer to read. 458 * @param inlen Length of the buffer to read. 459 * @param ctx The block context to use. 460 * @return APR_ECRYPT if an error occurred. Returns APR_ENOTIMPL if 461 * not implemented. 462 */ 463APU_DECLARE(apr_status_t) apr_crypto_block_decrypt(unsigned char **out, 464 apr_size_t *outlen, const unsigned char *in, apr_size_t inlen, 465 apr_crypto_block_t *ctx) 466{ 467 return ctx->provider->block_decrypt(out, outlen, in, inlen, ctx); 468} 469 470/** 471 * @brief Decrypt final data block, write it to out. 472 * @note If necessary the final block will be written out after being 473 * padded. Typically the final block will be written to the 474 * same buffer used by apr_crypto_block_decrypt, offset by the 475 * number of bytes returned as actually written by the 476 * apr_crypto_block_decrypt() call. After this call, the context 477 * is cleaned and can be reused by apr_crypto_block_decrypt_init(). 478 * @param out Address of a buffer to which data will be written. This 479 * buffer must already exist, and is usually the same 480 * buffer used by apr_evp_crypt(). See note. 481 * @param outlen Length of the output will be written here. 482 * @param ctx The block context to use. 483 * @return APR_ECRYPT if an error occurred. 484 * @return APR_EPADDING if padding was enabled and the block was incorrectly 485 * formatted. 486 * @return APR_ENOTIMPL if not implemented. 487 */ 488APU_DECLARE(apr_status_t) apr_crypto_block_decrypt_finish(unsigned char *out, 489 apr_size_t *outlen, apr_crypto_block_t *ctx) 490{ 491 return ctx->provider->block_decrypt_finish(out, outlen, ctx); 492} 493 494/** 495 * @brief Clean encryption / decryption context. 496 * @note After cleanup, a context is free to be reused if necessary. 497 * @param ctx The block context to use. 498 * @return Returns APR_ENOTIMPL if not supported. 499 */ 500APU_DECLARE(apr_status_t) apr_crypto_block_cleanup(apr_crypto_block_t *ctx) 501{ 502 return ctx->provider->block_cleanup(ctx); 503} 504 505/** 506 * @brief Clean encryption / decryption context. 507 * @note After cleanup, a context is free to be reused if necessary. 508 * @param f The context to use. 509 * @return Returns APR_ENOTIMPL if not supported. 510 */ 511APU_DECLARE(apr_status_t) apr_crypto_cleanup(apr_crypto_t *f) 512{ 513 return f->provider->cleanup(f); 514} 515 516/** 517 * @brief Shutdown the crypto library. 518 * @note After shutdown, it is expected that the init function can be called again. 519 * @param driver - driver to use 520 * @return Returns APR_ENOTIMPL if not supported. 521 */ 522APU_DECLARE(apr_status_t) apr_crypto_shutdown(const apr_crypto_driver_t *driver) 523{ 524 return driver->shutdown(); 525} 526 527#endif /* APU_HAVE_CRYPTO */ 528