1 /*************************************************************************** 2 * _ _ ____ _ 3 * Project ___| | | | _ \| | 4 * / __| | | | |_) | | 5 * | (__| |_| | _ <| |___ 6 * \___|\___/|_| \_\_____| 7 * 8 * Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel (at) haxx.se>, et al. 9 * 10 * This software is licensed as described in the file COPYING, which 11 * you should have received as part of this distribution. The terms 12 * are also available at https://curl.haxx.se/docs/copyright.html. 13 * 14 * You may opt to use, copy, modify, merge, publish, distribute and/or sell 15 * copies of the Software, and permit persons to whom the Software is 16 * furnished to do so, under the terms of the COPYING file. 17 * 18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY 19 * KIND, either express or implied. 20 * 21 ***************************************************************************/ 22 23 /* This file is for implementing all "generic" SSL functions that all libcurl 24 internals should use. It is then responsible for calling the proper 25 "backend" function. 26 27 SSL-functions in libcurl should call functions in this source file, and not 28 to any specific SSL-layer. 29 30 Curl_ssl_ - prefix for generic ones 31 Curl_ossl_ - prefix for OpenSSL ones 32 Curl_gtls_ - prefix for GnuTLS ones 33 Curl_nss_ - prefix for NSS ones 34 Curl_gskit_ - prefix for GSKit ones 35 Curl_polarssl_ - prefix for PolarSSL ones 36 Curl_cyassl_ - prefix for CyaSSL ones 37 Curl_schannel_ - prefix for Schannel SSPI ones 38 Curl_darwinssl_ - prefix for SecureTransport (Darwin) ones 39 40 Note that this source code uses curlssl_* functions, and they are all 41 defines/macros #defined by the lib-specific header files. 42 43 "SSL/TLS Strong Encryption: An Introduction" 44 https://httpd.apache.org/docs/2.0/ssl/ssl_intro.html 45 */ 46 47 #include "curl_setup.h" 48 49 #ifdef HAVE_SYS_TYPES_H 50 #include <sys/types.h> 51 #endif 52 #ifdef HAVE_SYS_STAT_H 53 #include <sys/stat.h> 54 #endif 55 #ifdef HAVE_FCNTL_H 56 #include <fcntl.h> 57 #endif 58 59 #include "urldata.h" 60 61 #include "vtls.h" /* generic SSL protos etc */ 62 #include "slist.h" 63 #include "sendf.h" 64 #include "rawstr.h" 65 #include "url.h" 66 #include "progress.h" 67 #include "share.h" 68 #include "timeval.h" 69 #include "curl_md5.h" 70 #include "warnless.h" 71 #include "curl_base64.h" 72 #include "curl_printf.h" 73 74 /* The last #include files should be: */ 75 #include "curl_memory.h" 76 #include "memdebug.h" 77 78 /* convenience macro to check if this handle is using a shared SSL session */ 79 #define SSLSESSION_SHARED(data) (data->share && \ 80 (data->share->specifier & \ 81 (1<<CURL_LOCK_DATA_SSL_SESSION))) 82 83 static bool safe_strequal(char* str1, char* str2) 84 { 85 if(str1 && str2) 86 /* both pointers point to something then compare them */ 87 return (0 != Curl_raw_equal(str1, str2)) ? TRUE : FALSE; 88 else 89 /* if both pointers are NULL then treat them as equal */ 90 return (!str1 && !str2) ? TRUE : FALSE; 91 } 92 93 bool 94 Curl_ssl_config_matches(struct ssl_config_data* data, 95 struct ssl_config_data* needle) 96 { 97 if((data->version == needle->version) && 98 (data->verifypeer == needle->verifypeer) && 99 (data->verifyhost == needle->verifyhost) && 100 safe_strequal(data->CApath, needle->CApath) && 101 safe_strequal(data->CAfile, needle->CAfile) && 102 safe_strequal(data->clientcert, needle->clientcert) && 103 safe_strequal(data->random_file, needle->random_file) && 104 safe_strequal(data->egdsocket, needle->egdsocket) && 105 safe_strequal(data->cipher_list, needle->cipher_list)) 106 return TRUE; 107 108 return FALSE; 109 } 110 111 bool 112 Curl_clone_ssl_config(struct ssl_config_data *source, 113 struct ssl_config_data *dest) 114 { 115 dest->sessionid = source->sessionid; 116 dest->verifyhost = source->verifyhost; 117 dest->verifypeer = source->verifypeer; 118 dest->version = source->version; 119 120 if(source->CAfile) { 121 dest->CAfile = strdup(source->CAfile); 122 if(!dest->CAfile) 123 return FALSE; 124 } 125 else 126 dest->CAfile = NULL; 127 128 if(source->CApath) { 129 dest->CApath = strdup(source->CApath); 130 if(!dest->CApath) 131 return FALSE; 132 } 133 else 134 dest->CApath = NULL; 135 136 if(source->cipher_list) { 137 dest->cipher_list = strdup(source->cipher_list); 138 if(!dest->cipher_list) 139 return FALSE; 140 } 141 else 142 dest->cipher_list = NULL; 143 144 if(source->egdsocket) { 145 dest->egdsocket = strdup(source->egdsocket); 146 if(!dest->egdsocket) 147 return FALSE; 148 } 149 else 150 dest->egdsocket = NULL; 151 152 if(source->random_file) { 153 dest->random_file = strdup(source->random_file); 154 if(!dest->random_file) 155 return FALSE; 156 } 157 else 158 dest->random_file = NULL; 159 160 if(source->clientcert) { 161 dest->clientcert = strdup(source->clientcert); 162 if(!dest->clientcert) 163 return FALSE; 164 dest->sessionid = FALSE; 165 } 166 else 167 dest->clientcert = NULL; 168 169 return TRUE; 170 } 171 172 void Curl_free_ssl_config(struct ssl_config_data* sslc) 173 { 174 Curl_safefree(sslc->CAfile); 175 Curl_safefree(sslc->CApath); 176 Curl_safefree(sslc->cipher_list); 177 Curl_safefree(sslc->egdsocket); 178 Curl_safefree(sslc->random_file); 179 Curl_safefree(sslc->clientcert); 180 } 181 182 183 /* 184 * Curl_rand() returns a random unsigned integer, 32bit. 185 * 186 * This non-SSL function is put here only because this file is the only one 187 * with knowledge of what the underlying SSL libraries provide in terms of 188 * randomizers. 189 * 190 * NOTE: 'data' may be passed in as NULL when coming from external API without 191 * easy handle! 192 * 193 */ 194 195 unsigned int Curl_rand(struct Curl_easy *data) 196 { 197 unsigned int r = 0; 198 static unsigned int randseed; 199 static bool seeded = FALSE; 200 201 #ifdef CURLDEBUG 202 char *force_entropy = getenv("CURL_ENTROPY"); 203 if(force_entropy) { 204 if(!seeded) { 205 size_t elen = strlen(force_entropy); 206 size_t clen = sizeof(randseed); 207 size_t min = elen < clen ? elen : clen; 208 memcpy((char *)&randseed, force_entropy, min); 209 seeded = TRUE; 210 } 211 else 212 randseed++; 213 return randseed; 214 } 215 #endif 216 217 /* data may be NULL! */ 218 if(!Curl_ssl_random(data, (unsigned char *)&r, sizeof(r))) 219 return r; 220 221 /* If Curl_ssl_random() returns non-zero it couldn't offer randomness and we 222 instead perform a "best effort" */ 223 224 #ifdef RANDOM_FILE 225 if(!seeded) { 226 /* if there's a random file to read a seed from, use it */ 227 int fd = open(RANDOM_FILE, O_RDONLY); 228 if(fd > -1) { 229 /* read random data into the randseed variable */ 230 ssize_t nread = read(fd, &randseed, sizeof(randseed)); 231 if(nread == sizeof(randseed)) 232 seeded = TRUE; 233 close(fd); 234 } 235 } 236 #endif 237 238 if(!seeded) { 239 struct timeval now = curlx_tvnow(); 240 infof(data, "WARNING: Using weak random seed\n"); 241 randseed += (unsigned int)now.tv_usec + (unsigned int)now.tv_sec; 242 randseed = randseed * 1103515245 + 12345; 243 randseed = randseed * 1103515245 + 12345; 244 randseed = randseed * 1103515245 + 12345; 245 seeded = TRUE; 246 } 247 248 /* Return an unsigned 32-bit pseudo-random number. */ 249 r = randseed = randseed * 1103515245 + 12345; 250 return (r << 16) | ((r >> 16) & 0xFFFF); 251 } 252 253 int Curl_ssl_backend(void) 254 { 255 return (int)CURL_SSL_BACKEND; 256 } 257 258 #ifdef USE_SSL 259 260 /* "global" init done? */ 261 static bool init_ssl=FALSE; 262 263 /** 264 * Global SSL init 265 * 266 * @retval 0 error initializing SSL 267 * @retval 1 SSL initialized successfully 268 */ 269 int Curl_ssl_init(void) 270 { 271 /* make sure this is only done once */ 272 if(init_ssl) 273 return 1; 274 init_ssl = TRUE; /* never again */ 275 276 return curlssl_init(); 277 } 278 279 280 /* Global cleanup */ 281 void Curl_ssl_cleanup(void) 282 { 283 if(init_ssl) { 284 /* only cleanup if we did a previous init */ 285 curlssl_cleanup(); 286 init_ssl = FALSE; 287 } 288 } 289 290 static bool ssl_prefs_check(struct Curl_easy *data) 291 { 292 /* check for CURLOPT_SSLVERSION invalid parameter value */ 293 if((data->set.ssl.version < 0) 294 || (data->set.ssl.version >= CURL_SSLVERSION_LAST)) { 295 failf(data, "Unrecognized parameter value passed via CURLOPT_SSLVERSION"); 296 return FALSE; 297 } 298 return TRUE; 299 } 300 301 CURLcode 302 Curl_ssl_connect(struct connectdata *conn, int sockindex) 303 { 304 CURLcode result; 305 306 if(!ssl_prefs_check(conn->data)) 307 return CURLE_SSL_CONNECT_ERROR; 308 309 /* mark this is being ssl-enabled from here on. */ 310 conn->ssl[sockindex].use = TRUE; 311 conn->ssl[sockindex].state = ssl_connection_negotiating; 312 313 result = curlssl_connect(conn, sockindex); 314 315 if(!result) 316 Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */ 317 318 return result; 319 } 320 321 CURLcode 322 Curl_ssl_connect_nonblocking(struct connectdata *conn, int sockindex, 323 bool *done) 324 { 325 CURLcode result; 326 327 if(!ssl_prefs_check(conn->data)) 328 return CURLE_SSL_CONNECT_ERROR; 329 330 /* mark this is being ssl requested from here on. */ 331 conn->ssl[sockindex].use = TRUE; 332 #ifdef curlssl_connect_nonblocking 333 result = curlssl_connect_nonblocking(conn, sockindex, done); 334 #else 335 *done = TRUE; /* fallback to BLOCKING */ 336 result = curlssl_connect(conn, sockindex); 337 #endif /* non-blocking connect support */ 338 if(!result && *done) 339 Curl_pgrsTime(conn->data, TIMER_APPCONNECT); /* SSL is connected */ 340 return result; 341 } 342 343 /* 344 * Lock shared SSL session data 345 */ 346 void Curl_ssl_sessionid_lock(struct connectdata *conn) 347 { 348 if(SSLSESSION_SHARED(conn->data)) 349 Curl_share_lock(conn->data, 350 CURL_LOCK_DATA_SSL_SESSION, CURL_LOCK_ACCESS_SINGLE); 351 } 352 353 /* 354 * Unlock shared SSL session data 355 */ 356 void Curl_ssl_sessionid_unlock(struct connectdata *conn) 357 { 358 if(SSLSESSION_SHARED(conn->data)) 359 Curl_share_unlock(conn->data, CURL_LOCK_DATA_SSL_SESSION); 360 } 361 362 /* 363 * Check if there's a session ID for the given connection in the cache, and if 364 * there's one suitable, it is provided. Returns TRUE when no entry matched. 365 */ 366 bool Curl_ssl_getsessionid(struct connectdata *conn, 367 void **ssl_sessionid, 368 size_t *idsize) /* set 0 if unknown */ 369 { 370 struct curl_ssl_session *check; 371 struct Curl_easy *data = conn->data; 372 size_t i; 373 long *general_age; 374 bool no_match = TRUE; 375 376 *ssl_sessionid = NULL; 377 378 DEBUGASSERT(conn->ssl_config.sessionid); 379 380 if(!conn->ssl_config.sessionid) 381 /* session ID re-use is disabled */ 382 return TRUE; 383 384 /* Lock if shared */ 385 if(SSLSESSION_SHARED(data)) 386 general_age = &data->share->sessionage; 387 else 388 general_age = &data->state.sessionage; 389 390 for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) { 391 check = &data->state.session[i]; 392 if(!check->sessionid) 393 /* not session ID means blank entry */ 394 continue; 395 if(Curl_raw_equal(conn->host.name, check->name) && 396 ((!conn->bits.conn_to_host && !check->conn_to_host) || 397 (conn->bits.conn_to_host && check->conn_to_host && 398 Curl_raw_equal(conn->conn_to_host.name, check->conn_to_host))) && 399 ((!conn->bits.conn_to_port && check->conn_to_port == -1) || 400 (conn->bits.conn_to_port && check->conn_to_port != -1 && 401 conn->conn_to_port == check->conn_to_port)) && 402 (conn->remote_port == check->remote_port) && 403 Curl_ssl_config_matches(&conn->ssl_config, &check->ssl_config)) { 404 /* yes, we have a session ID! */ 405 (*general_age)++; /* increase general age */ 406 check->age = *general_age; /* set this as used in this age */ 407 *ssl_sessionid = check->sessionid; 408 if(idsize) 409 *idsize = check->idsize; 410 no_match = FALSE; 411 break; 412 } 413 } 414 415 return no_match; 416 } 417 418 /* 419 * Kill a single session ID entry in the cache. 420 */ 421 void Curl_ssl_kill_session(struct curl_ssl_session *session) 422 { 423 if(session->sessionid) { 424 /* defensive check */ 425 426 /* free the ID the SSL-layer specific way */ 427 curlssl_session_free(session->sessionid); 428 429 session->sessionid = NULL; 430 session->age = 0; /* fresh */ 431 432 Curl_free_ssl_config(&session->ssl_config); 433 434 Curl_safefree(session->name); 435 Curl_safefree(session->conn_to_host); 436 } 437 } 438 439 /* 440 * Delete the given session ID from the cache. 441 */ 442 void Curl_ssl_delsessionid(struct connectdata *conn, void *ssl_sessionid) 443 { 444 size_t i; 445 struct Curl_easy *data=conn->data; 446 447 for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) { 448 struct curl_ssl_session *check = &data->state.session[i]; 449 450 if(check->sessionid == ssl_sessionid) { 451 Curl_ssl_kill_session(check); 452 break; 453 } 454 } 455 } 456 457 /* 458 * Store session id in the session cache. The ID passed on to this function 459 * must already have been extracted and allocated the proper way for the SSL 460 * layer. Curl_XXXX_session_free() will be called to free/kill the session ID 461 * later on. 462 */ 463 CURLcode Curl_ssl_addsessionid(struct connectdata *conn, 464 void *ssl_sessionid, 465 size_t idsize) 466 { 467 size_t i; 468 struct Curl_easy *data=conn->data; /* the mother of all structs */ 469 struct curl_ssl_session *store = &data->state.session[0]; 470 long oldest_age=data->state.session[0].age; /* zero if unused */ 471 char *clone_host; 472 char *clone_conn_to_host; 473 int conn_to_port; 474 long *general_age; 475 476 DEBUGASSERT(conn->ssl_config.sessionid); 477 478 clone_host = strdup(conn->host.name); 479 if(!clone_host) 480 return CURLE_OUT_OF_MEMORY; /* bail out */ 481 482 if(conn->bits.conn_to_host) { 483 clone_conn_to_host = strdup(conn->conn_to_host.name); 484 if(!clone_conn_to_host) { 485 free(clone_host); 486 return CURLE_OUT_OF_MEMORY; /* bail out */ 487 } 488 } 489 else 490 clone_conn_to_host = NULL; 491 492 if(conn->bits.conn_to_port) 493 conn_to_port = conn->conn_to_port; 494 else 495 conn_to_port = -1; 496 497 /* Now we should add the session ID and the host name to the cache, (remove 498 the oldest if necessary) */ 499 500 /* If using shared SSL session, lock! */ 501 if(SSLSESSION_SHARED(data)) { 502 general_age = &data->share->sessionage; 503 } 504 else { 505 general_age = &data->state.sessionage; 506 } 507 508 /* find an empty slot for us, or find the oldest */ 509 for(i = 1; (i < data->set.ssl.max_ssl_sessions) && 510 data->state.session[i].sessionid; i++) { 511 if(data->state.session[i].age < oldest_age) { 512 oldest_age = data->state.session[i].age; 513 store = &data->state.session[i]; 514 } 515 } 516 if(i == data->set.ssl.max_ssl_sessions) 517 /* cache is full, we must "kill" the oldest entry! */ 518 Curl_ssl_kill_session(store); 519 else 520 store = &data->state.session[i]; /* use this slot */ 521 522 /* now init the session struct wisely */ 523 store->sessionid = ssl_sessionid; 524 store->idsize = idsize; 525 store->age = *general_age; /* set current age */ 526 /* free it if there's one already present */ 527 free(store->name); 528 free(store->conn_to_host); 529 store->name = clone_host; /* clone host name */ 530 store->conn_to_host = clone_conn_to_host; /* clone connect to host name */ 531 store->conn_to_port = conn_to_port; /* connect to port number */ 532 store->remote_port = conn->remote_port; /* port number */ 533 534 if(!Curl_clone_ssl_config(&conn->ssl_config, &store->ssl_config)) { 535 store->sessionid = NULL; /* let caller free sessionid */ 536 free(clone_host); 537 free(clone_conn_to_host); 538 return CURLE_OUT_OF_MEMORY; 539 } 540 541 return CURLE_OK; 542 } 543 544 545 void Curl_ssl_close_all(struct Curl_easy *data) 546 { 547 size_t i; 548 /* kill the session ID cache if not shared */ 549 if(data->state.session && !SSLSESSION_SHARED(data)) { 550 for(i = 0; i < data->set.ssl.max_ssl_sessions; i++) 551 /* the single-killer function handles empty table slots */ 552 Curl_ssl_kill_session(&data->state.session[i]); 553 554 /* free the cache data */ 555 Curl_safefree(data->state.session); 556 } 557 558 curlssl_close_all(data); 559 } 560 561 void Curl_ssl_close(struct connectdata *conn, int sockindex) 562 { 563 DEBUGASSERT((sockindex <= 1) && (sockindex >= -1)); 564 curlssl_close(conn, sockindex); 565 } 566 567 CURLcode Curl_ssl_shutdown(struct connectdata *conn, int sockindex) 568 { 569 if(curlssl_shutdown(conn, sockindex)) 570 return CURLE_SSL_SHUTDOWN_FAILED; 571 572 conn->ssl[sockindex].use = FALSE; /* get back to ordinary socket usage */ 573 conn->ssl[sockindex].state = ssl_connection_none; 574 575 conn->recv[sockindex] = Curl_recv_plain; 576 conn->send[sockindex] = Curl_send_plain; 577 578 return CURLE_OK; 579 } 580 581 /* Selects an SSL crypto engine 582 */ 583 CURLcode Curl_ssl_set_engine(struct Curl_easy *data, const char *engine) 584 { 585 return curlssl_set_engine(data, engine); 586 } 587 588 /* Selects the default SSL crypto engine 589 */ 590 CURLcode Curl_ssl_set_engine_default(struct Curl_easy *data) 591 { 592 return curlssl_set_engine_default(data); 593 } 594 595 /* Return list of OpenSSL crypto engine names. */ 596 struct curl_slist *Curl_ssl_engines_list(struct Curl_easy *data) 597 { 598 return curlssl_engines_list(data); 599 } 600 601 /* 602 * This sets up a session ID cache to the specified size. Make sure this code 603 * is agnostic to what underlying SSL technology we use. 604 */ 605 CURLcode Curl_ssl_initsessions(struct Curl_easy *data, size_t amount) 606 { 607 struct curl_ssl_session *session; 608 609 if(data->state.session) 610 /* this is just a precaution to prevent multiple inits */ 611 return CURLE_OK; 612 613 session = calloc(amount, sizeof(struct curl_ssl_session)); 614 if(!session) 615 return CURLE_OUT_OF_MEMORY; 616 617 /* store the info in the SSL section */ 618 data->set.ssl.max_ssl_sessions = amount; 619 data->state.session = session; 620 data->state.sessionage = 1; /* this is brand new */ 621 return CURLE_OK; 622 } 623 624 size_t Curl_ssl_version(char *buffer, size_t size) 625 { 626 return curlssl_version(buffer, size); 627 } 628 629 /* 630 * This function tries to determine connection status. 631 * 632 * Return codes: 633 * 1 means the connection is still in place 634 * 0 means the connection has been closed 635 * -1 means the connection status is unknown 636 */ 637 int Curl_ssl_check_cxn(struct connectdata *conn) 638 { 639 return curlssl_check_cxn(conn); 640 } 641 642 bool Curl_ssl_data_pending(const struct connectdata *conn, 643 int connindex) 644 { 645 return curlssl_data_pending(conn, connindex); 646 } 647 648 void Curl_ssl_free_certinfo(struct Curl_easy *data) 649 { 650 int i; 651 struct curl_certinfo *ci = &data->info.certs; 652 653 if(ci->num_of_certs) { 654 /* free all individual lists used */ 655 for(i=0; i<ci->num_of_certs; i++) { 656 curl_slist_free_all(ci->certinfo[i]); 657 ci->certinfo[i] = NULL; 658 } 659 660 free(ci->certinfo); /* free the actual array too */ 661 ci->certinfo = NULL; 662 ci->num_of_certs = 0; 663 } 664 } 665 666 CURLcode Curl_ssl_init_certinfo(struct Curl_easy *data, int num) 667 { 668 struct curl_certinfo *ci = &data->info.certs; 669 struct curl_slist **table; 670 671 /* Free any previous certificate information structures */ 672 Curl_ssl_free_certinfo(data); 673 674 /* Allocate the required certificate information structures */ 675 table = calloc((size_t) num, sizeof(struct curl_slist *)); 676 if(!table) 677 return CURLE_OUT_OF_MEMORY; 678 679 ci->num_of_certs = num; 680 ci->certinfo = table; 681 682 return CURLE_OK; 683 } 684 685 /* 686 * 'value' is NOT a zero terminated string 687 */ 688 CURLcode Curl_ssl_push_certinfo_len(struct Curl_easy *data, 689 int certnum, 690 const char *label, 691 const char *value, 692 size_t valuelen) 693 { 694 struct curl_certinfo * ci = &data->info.certs; 695 char * output; 696 struct curl_slist * nl; 697 CURLcode result = CURLE_OK; 698 size_t labellen = strlen(label); 699 size_t outlen = labellen + 1 + valuelen + 1; /* label:value\0 */ 700 701 output = malloc(outlen); 702 if(!output) 703 return CURLE_OUT_OF_MEMORY; 704 705 /* sprintf the label and colon */ 706 snprintf(output, outlen, "%s:", label); 707 708 /* memcpy the value (it might not be zero terminated) */ 709 memcpy(&output[labellen+1], value, valuelen); 710 711 /* zero terminate the output */ 712 output[labellen + 1 + valuelen] = 0; 713 714 nl = Curl_slist_append_nodup(ci->certinfo[certnum], output); 715 if(!nl) { 716 free(output); 717 curl_slist_free_all(ci->certinfo[certnum]); 718 result = CURLE_OUT_OF_MEMORY; 719 } 720 721 ci->certinfo[certnum] = nl; 722 return result; 723 } 724 725 /* 726 * This is a convenience function for push_certinfo_len that takes a zero 727 * terminated value. 728 */ 729 CURLcode Curl_ssl_push_certinfo(struct Curl_easy *data, 730 int certnum, 731 const char *label, 732 const char *value) 733 { 734 size_t valuelen = strlen(value); 735 736 return Curl_ssl_push_certinfo_len(data, certnum, label, value, valuelen); 737 } 738 739 int Curl_ssl_random(struct Curl_easy *data, 740 unsigned char *entropy, 741 size_t length) 742 { 743 return curlssl_random(data, entropy, length); 744 } 745 746 /* 747 * Public key pem to der conversion 748 */ 749 750 static CURLcode pubkey_pem_to_der(const char *pem, 751 unsigned char **der, size_t *der_len) 752 { 753 char *stripped_pem, *begin_pos, *end_pos; 754 size_t pem_count, stripped_pem_count = 0, pem_len; 755 CURLcode result; 756 757 /* if no pem, exit. */ 758 if(!pem) 759 return CURLE_BAD_CONTENT_ENCODING; 760 761 begin_pos = strstr(pem, "-----BEGIN PUBLIC KEY-----"); 762 if(!begin_pos) 763 return CURLE_BAD_CONTENT_ENCODING; 764 765 pem_count = begin_pos - pem; 766 /* Invalid if not at beginning AND not directly following \n */ 767 if(0 != pem_count && '\n' != pem[pem_count - 1]) 768 return CURLE_BAD_CONTENT_ENCODING; 769 770 /* 26 is length of "-----BEGIN PUBLIC KEY-----" */ 771 pem_count += 26; 772 773 /* Invalid if not directly following \n */ 774 end_pos = strstr(pem + pem_count, "\n-----END PUBLIC KEY-----"); 775 if(!end_pos) 776 return CURLE_BAD_CONTENT_ENCODING; 777 778 pem_len = end_pos - pem; 779 780 stripped_pem = malloc(pem_len - pem_count + 1); 781 if(!stripped_pem) 782 return CURLE_OUT_OF_MEMORY; 783 784 /* 785 * Here we loop through the pem array one character at a time between the 786 * correct indices, and place each character that is not '\n' or '\r' 787 * into the stripped_pem array, which should represent the raw base64 string 788 */ 789 while(pem_count < pem_len) { 790 if('\n' != pem[pem_count] && '\r' != pem[pem_count]) 791 stripped_pem[stripped_pem_count++] = pem[pem_count]; 792 ++pem_count; 793 } 794 /* Place the null terminator in the correct place */ 795 stripped_pem[stripped_pem_count] = '\0'; 796 797 result = Curl_base64_decode(stripped_pem, der, der_len); 798 799 Curl_safefree(stripped_pem); 800 801 return result; 802 } 803 804 /* 805 * Generic pinned public key check. 806 */ 807 808 CURLcode Curl_pin_peer_pubkey(struct Curl_easy *data, 809 const char *pinnedpubkey, 810 const unsigned char *pubkey, size_t pubkeylen) 811 { 812 FILE *fp; 813 unsigned char *buf = NULL, *pem_ptr = NULL; 814 long filesize; 815 size_t size, pem_len; 816 CURLcode pem_read; 817 CURLcode result = CURLE_SSL_PINNEDPUBKEYNOTMATCH; 818 #ifdef curlssl_sha256sum 819 CURLcode encode; 820 size_t encodedlen, pinkeylen; 821 char *encoded, *pinkeycopy, *begin_pos, *end_pos; 822 unsigned char *sha256sumdigest = NULL; 823 #endif 824 825 /* if a path wasn't specified, don't pin */ 826 if(!pinnedpubkey) 827 return CURLE_OK; 828 if(!pubkey || !pubkeylen) 829 return result; 830 831 /* only do this if pinnedpubkey starts with "sha256//", length 8 */ 832 if(strncmp(pinnedpubkey, "sha256//", 8) == 0) { 833 #ifdef curlssl_sha256sum 834 /* compute sha256sum of public key */ 835 sha256sumdigest = malloc(SHA256_DIGEST_LENGTH); 836 if(!sha256sumdigest) 837 return CURLE_OUT_OF_MEMORY; 838 curlssl_sha256sum(pubkey, pubkeylen, 839 sha256sumdigest, SHA256_DIGEST_LENGTH); 840 encode = Curl_base64_encode(data, (char *)sha256sumdigest, 841 SHA256_DIGEST_LENGTH, &encoded, &encodedlen); 842 Curl_safefree(sha256sumdigest); 843 844 if(encode) 845 return encode; 846 847 infof(data, "\t public key hash: sha256//%s\n", encoded); 848 849 /* it starts with sha256//, copy so we can modify it */ 850 pinkeylen = strlen(pinnedpubkey) + 1; 851 pinkeycopy = malloc(pinkeylen); 852 if(!pinkeycopy) { 853 Curl_safefree(encoded); 854 return CURLE_OUT_OF_MEMORY; 855 } 856 memcpy(pinkeycopy, pinnedpubkey, pinkeylen); 857 /* point begin_pos to the copy, and start extracting keys */ 858 begin_pos = pinkeycopy; 859 do { 860 end_pos = strstr(begin_pos, ";sha256//"); 861 /* 862 * if there is an end_pos, null terminate, 863 * otherwise it'll go to the end of the original string 864 */ 865 if(end_pos) 866 end_pos[0] = '\0'; 867 868 /* compare base64 sha256 digests, 8 is the length of "sha256//" */ 869 if(encodedlen == strlen(begin_pos + 8) && 870 !memcmp(encoded, begin_pos + 8, encodedlen)) { 871 result = CURLE_OK; 872 break; 873 } 874 875 /* 876 * change back the null-terminator we changed earlier, 877 * and look for next begin 878 */ 879 if(end_pos) { 880 end_pos[0] = ';'; 881 begin_pos = strstr(end_pos, "sha256//"); 882 } 883 } while(end_pos && begin_pos); 884 Curl_safefree(encoded); 885 Curl_safefree(pinkeycopy); 886 #else 887 /* without sha256 support, this cannot match */ 888 (void)data; 889 #endif 890 return result; 891 } 892 893 fp = fopen(pinnedpubkey, "rb"); 894 if(!fp) 895 return result; 896 897 do { 898 /* Determine the file's size */ 899 if(fseek(fp, 0, SEEK_END)) 900 break; 901 filesize = ftell(fp); 902 if(fseek(fp, 0, SEEK_SET)) 903 break; 904 if(filesize < 0 || filesize > MAX_PINNED_PUBKEY_SIZE) 905 break; 906 907 /* 908 * if the size of our certificate is bigger than the file 909 * size then it can't match 910 */ 911 size = curlx_sotouz((curl_off_t) filesize); 912 if(pubkeylen > size) 913 break; 914 915 /* 916 * Allocate buffer for the pinned key 917 * With 1 additional byte for null terminator in case of PEM key 918 */ 919 buf = malloc(size + 1); 920 if(!buf) 921 break; 922 923 /* Returns number of elements read, which should be 1 */ 924 if((int) fread(buf, size, 1, fp) != 1) 925 break; 926 927 /* If the sizes are the same, it can't be base64 encoded, must be der */ 928 if(pubkeylen == size) { 929 if(!memcmp(pubkey, buf, pubkeylen)) 930 result = CURLE_OK; 931 break; 932 } 933 934 /* 935 * Otherwise we will assume it's PEM and try to decode it 936 * after placing null terminator 937 */ 938 buf[size] = '\0'; 939 pem_read = pubkey_pem_to_der((const char *)buf, &pem_ptr, &pem_len); 940 /* if it wasn't read successfully, exit */ 941 if(pem_read) 942 break; 943 944 /* 945 * if the size of our certificate doesn't match the size of 946 * the decoded file, they can't be the same, otherwise compare 947 */ 948 if(pubkeylen == pem_len && !memcmp(pubkey, pem_ptr, pubkeylen)) 949 result = CURLE_OK; 950 } while(0); 951 952 Curl_safefree(buf); 953 Curl_safefree(pem_ptr); 954 fclose(fp); 955 956 return result; 957 } 958 959 #ifndef CURL_DISABLE_CRYPTO_AUTH 960 CURLcode Curl_ssl_md5sum(unsigned char *tmp, /* input */ 961 size_t tmplen, 962 unsigned char *md5sum, /* output */ 963 size_t md5len) 964 { 965 #ifdef curlssl_md5sum 966 curlssl_md5sum(tmp, tmplen, md5sum, md5len); 967 #else 968 MD5_context *MD5pw; 969 970 (void) md5len; 971 972 MD5pw = Curl_MD5_init(Curl_DIGEST_MD5); 973 if(!MD5pw) 974 return CURLE_OUT_OF_MEMORY; 975 Curl_MD5_update(MD5pw, tmp, curlx_uztoui(tmplen)); 976 Curl_MD5_final(MD5pw, md5sum); 977 #endif 978 return CURLE_OK; 979 } 980 #endif 981 982 /* 983 * Check whether the SSL backend supports the status_request extension. 984 */ 985 bool Curl_ssl_cert_status_request(void) 986 { 987 #ifdef curlssl_cert_status_request 988 return curlssl_cert_status_request(); 989 #else 990 return FALSE; 991 #endif 992 } 993 994 /* 995 * Check whether the SSL backend supports false start. 996 */ 997 bool Curl_ssl_false_start(void) 998 { 999 #ifdef curlssl_false_start 1000 return curlssl_false_start(); 1001 #else 1002 return FALSE; 1003 #endif 1004 } 1005 1006 #endif /* USE_SSL */ 1007