1 /* 2 * Copyright (c) 2000-2003 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 * 9 */ 10 11 #include <sendmail.h> 12 13 SM_RCSID("@(#)$Id: tls.c,v 8.79.4.5 2003/12/28 04:23:28 gshapiro Exp $") 14 15 #if STARTTLS 16 # include <openssl/err.h> 17 # include <openssl/bio.h> 18 # include <openssl/pem.h> 19 # ifndef HASURANDOMDEV 20 # include <openssl/rand.h> 21 # endif /* ! HASURANDOMDEV */ 22 # if !TLS_NO_RSA 23 static RSA *rsa_tmp = NULL; /* temporary RSA key */ 24 static RSA *tmp_rsa_key __P((SSL *, int, int)); 25 # endif /* !TLS_NO_RSA */ 26 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 27 static int tls_verify_cb __P((X509_STORE_CTX *)); 28 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 29 static int tls_verify_cb __P((X509_STORE_CTX *, void *)); 30 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 31 32 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 33 # define CONST097 34 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 35 # define CONST097 const 36 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 37 static void apps_ssl_info_cb __P((CONST097 SSL *, int , int)); 38 39 # if !NO_DH 40 static DH *get_dh512 __P((void)); 41 42 static unsigned char dh512_p[] = 43 { 44 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75, 45 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F, 46 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3, 47 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12, 48 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C, 49 0x47,0x74,0xE8,0x33 50 }; 51 static unsigned char dh512_g[] = 52 { 53 0x02 54 }; 55 56 static DH * 57 get_dh512() 58 { 59 DH *dh = NULL; 60 61 if ((dh = DH_new()) == NULL) 62 return NULL; 63 dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL); 64 dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL); 65 if ((dh->p == NULL) || (dh->g == NULL)) 66 return NULL; 67 return dh; 68 } 69 # endif /* !NO_DH */ 70 71 72 /* 73 ** TLS_RAND_INIT -- initialize STARTTLS random generator 74 ** 75 ** Parameters: 76 ** randfile -- name of file with random data 77 ** logl -- loglevel 78 ** 79 ** Returns: 80 ** success/failure 81 ** 82 ** Side Effects: 83 ** initializes PRNG for tls library. 84 */ 85 86 # define MIN_RAND_BYTES 128 /* 1024 bits */ 87 88 # define RF_OK 0 /* randfile OK */ 89 # define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */ 90 # define RF_UNKNOWN 2 /* unknown prefix for randfile */ 91 92 # define RI_NONE 0 /* no init yet */ 93 # define RI_SUCCESS 1 /* init was successful */ 94 # define RI_FAIL 2 /* init failed */ 95 96 static bool tls_rand_init __P((char *, int)); 97 98 static bool 99 tls_rand_init(randfile, logl) 100 char *randfile; 101 int logl; 102 { 103 # ifndef HASURANDOMDEV 104 /* not required if /dev/urandom exists, OpenSSL does it internally */ 105 106 bool ok; 107 int randdef; 108 static int done = RI_NONE; 109 110 /* 111 ** initialize PRNG 112 */ 113 114 /* did we try this before? if yes: return old value */ 115 if (done != RI_NONE) 116 return done == RI_SUCCESS; 117 118 /* set default values */ 119 ok = false; 120 done = RI_FAIL; 121 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK; 122 # if EGD 123 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0) 124 { 125 randfile += 4; 126 if (RAND_egd(randfile) < 0) 127 { 128 sm_syslog(LOG_WARNING, NOQID, 129 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded", 130 randfile); 131 } 132 else 133 ok = true; 134 } 135 else 136 # endif /* EGD */ 137 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0) 138 { 139 int fd; 140 long sff; 141 struct stat st; 142 143 randfile += 5; 144 sff = SFF_SAFEDIRPATH | SFF_NOWLINK 145 | SFF_NOGWFILES | SFF_NOWWFILES 146 | SFF_NOGRFILES | SFF_NOWRFILES 147 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 148 if (DontLockReadFiles) 149 sff |= SFF_NOLOCK; 150 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0) 151 { 152 if (fstat(fd, &st) < 0) 153 { 154 if (LogLevel > logl) 155 sm_syslog(LOG_ERR, NOQID, 156 "STARTTLS: can't fstat(%s)", 157 randfile); 158 } 159 else 160 { 161 bool use, problem; 162 163 use = true; 164 problem = false; 165 166 /* max. age of file: 10 minutes */ 167 if (st.st_mtime + 600 < curtime()) 168 { 169 use = bitnset(DBS_INSUFFICIENTENTROPY, 170 DontBlameSendmail); 171 problem = true; 172 if (LogLevel > logl) 173 sm_syslog(LOG_ERR, NOQID, 174 "STARTTLS: RandFile %s too old: %s", 175 randfile, 176 use ? "unsafe" : 177 "unusable"); 178 } 179 if (use && st.st_size < MIN_RAND_BYTES) 180 { 181 use = bitnset(DBS_INSUFFICIENTENTROPY, 182 DontBlameSendmail); 183 problem = true; 184 if (LogLevel > logl) 185 sm_syslog(LOG_ERR, NOQID, 186 "STARTTLS: size(%s) < %d: %s", 187 randfile, 188 MIN_RAND_BYTES, 189 use ? "unsafe" : 190 "unusable"); 191 } 192 if (use) 193 ok = RAND_load_file(randfile, -1) >= 194 MIN_RAND_BYTES; 195 if (use && !ok) 196 { 197 if (LogLevel > logl) 198 sm_syslog(LOG_WARNING, NOQID, 199 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded", 200 randfile); 201 } 202 if (problem) 203 ok = false; 204 } 205 if (ok || bitnset(DBS_INSUFFICIENTENTROPY, 206 DontBlameSendmail)) 207 { 208 /* add this even if fstat() failed */ 209 RAND_seed((void *) &st, sizeof st); 210 } 211 (void) close(fd); 212 } 213 else 214 { 215 if (LogLevel > logl) 216 sm_syslog(LOG_WARNING, NOQID, 217 "STARTTLS: Warning: safeopen(%s) failed", 218 randfile); 219 } 220 } 221 else if (randdef == RF_OK) 222 { 223 if (LogLevel > logl) 224 sm_syslog(LOG_WARNING, NOQID, 225 "STARTTLS: Error: no proper random file definition %s", 226 randfile); 227 randdef = RF_UNKNOWN; 228 } 229 if (randdef == RF_MISS) 230 { 231 if (LogLevel > logl) 232 sm_syslog(LOG_WARNING, NOQID, 233 "STARTTLS: Error: missing random file definition"); 234 } 235 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail)) 236 { 237 int i; 238 long r; 239 unsigned char buf[MIN_RAND_BYTES]; 240 241 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */ 242 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long)) 243 { 244 r = get_random(); 245 (void) memcpy(buf + i, (void *) &r, sizeof(long)); 246 } 247 RAND_seed(buf, sizeof buf); 248 if (LogLevel > logl) 249 sm_syslog(LOG_WARNING, NOQID, 250 "STARTTLS: Warning: random number generator not properly seeded"); 251 ok = true; 252 } 253 done = ok ? RI_SUCCESS : RI_FAIL; 254 return ok; 255 # else /* ! HASURANDOMDEV */ 256 return true; 257 # endif /* ! HASURANDOMDEV */ 258 } 259 /* 260 ** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use. 261 ** 262 ** Parameters: 263 ** none. 264 ** 265 ** Returns: 266 ** succeeded? 267 */ 268 269 bool 270 init_tls_library() 271 { 272 /* basic TLS initialization, ignore result for now */ 273 SSL_library_init(); 274 SSL_load_error_strings(); 275 # if 0 276 /* this is currently a macro for SSL_library_init */ 277 SSLeay_add_ssl_algorithms(); 278 # endif /* 0 */ 279 280 return tls_rand_init(RandFile, 7); 281 } 282 /* 283 ** TLS_SET_VERIFY -- request client certificate? 284 ** 285 ** Parameters: 286 ** ctx -- TLS context 287 ** ssl -- TLS structure 288 ** vrfy -- require certificate? 289 ** 290 ** Returns: 291 ** none. 292 ** 293 ** Side Effects: 294 ** Sets verification state for TLS 295 ** 296 # if TLS_VRFY_PER_CTX 297 ** Notice: 298 ** This is per TLS context, not per TLS structure; 299 ** the former is global, the latter per connection. 300 ** It would be nice to do this per connection, but this 301 ** doesn't work in the current TLS libraries :-( 302 # endif * TLS_VRFY_PER_CTX * 303 */ 304 305 void 306 tls_set_verify(ctx, ssl, vrfy) 307 SSL_CTX *ctx; 308 SSL *ssl; 309 bool vrfy; 310 { 311 # if !TLS_VRFY_PER_CTX 312 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL); 313 # else /* !TLS_VRFY_PER_CTX */ 314 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, 315 NULL); 316 # endif /* !TLS_VRFY_PER_CTX */ 317 } 318 319 /* 320 ** status in initialization 321 ** these flags keep track of the status of the initialization 322 ** i.e., whether a file exists (_EX) and whether it can be used (_OK) 323 ** [due to permissions] 324 */ 325 326 # define TLS_S_NONE 0x00000000 /* none yet */ 327 # define TLS_S_CERT_EX 0x00000001 /* cert file exists */ 328 # define TLS_S_CERT_OK 0x00000002 /* cert file is ok */ 329 # define TLS_S_KEY_EX 0x00000004 /* key file exists */ 330 # define TLS_S_KEY_OK 0x00000008 /* key file is ok */ 331 # define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */ 332 # define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */ 333 # define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */ 334 # define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */ 335 336 # if _FFR_TLS_1 337 # define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */ 338 # define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */ 339 # define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */ 340 # define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */ 341 # endif /* _FFR_TLS_1 */ 342 343 # define TLS_S_DH_OK 0x00200000 /* DH cert is ok */ 344 # define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */ 345 # define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */ 346 347 /* Type of variable */ 348 # define TLS_T_OTHER 0 349 # define TLS_T_SRV 1 350 # define TLS_T_CLT 2 351 352 /* 353 ** TLS_OK_F -- can var be an absolute filename? 354 ** 355 ** Parameters: 356 ** var -- filename 357 ** fn -- what is the filename used for? 358 ** type -- type of variable 359 ** 360 ** Returns: 361 ** ok? 362 */ 363 364 static bool 365 tls_ok_f(var, fn, type) 366 char *var; 367 char *fn; 368 int type; 369 { 370 /* must be absolute pathname */ 371 if (var != NULL && *var == '/') 372 return true; 373 if (LogLevel > 12) 374 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing", 375 type == TLS_T_SRV ? "Server" : 376 (type == TLS_T_CLT ? "Client" : ""), var); 377 return false; 378 } 379 /* 380 ** TLS_SAFE_F -- is a file safe to use? 381 ** 382 ** Parameters: 383 ** var -- filename 384 ** sff -- flags for safefile() 385 ** srv -- server side? 386 ** 387 ** Returns: 388 ** ok? 389 */ 390 391 static bool 392 tls_safe_f(var, sff, srv) 393 char *var; 394 long sff; 395 bool srv; 396 { 397 int ret; 398 399 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff, 400 S_IRUSR, NULL)) == 0) 401 return true; 402 if (LogLevel > 7) 403 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s", 404 srv ? "server" : "client", var, sm_errstring(ret)); 405 return false; 406 } 407 408 /* 409 ** TLS_OK_F -- macro to simplify calls to tls_ok_f 410 ** 411 ** Parameters: 412 ** var -- filename 413 ** fn -- what is the filename used for? 414 ** req -- is the file required? 415 ** st -- status bit to set if ok 416 ** type -- type of variable 417 ** 418 ** Side Effects: 419 ** uses r, ok; may change ok and status. 420 ** 421 */ 422 423 # define TLS_OK_F(var, fn, req, st, type) if (ok) \ 424 { \ 425 r = tls_ok_f(var, fn, type); \ 426 if (r) \ 427 status |= st; \ 428 else if (req) \ 429 ok = false; \ 430 } 431 432 /* 433 ** TLS_UNR -- macro to return whether a file should be unreadable 434 ** 435 ** Parameters: 436 ** bit -- flag to test 437 ** req -- flags 438 ** 439 ** Returns: 440 ** 0/SFF_NORFILES 441 */ 442 # define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0) 443 # define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0) 444 # define TLS_KEYSFF(req) \ 445 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \ 446 TLS_OUNR(TLS_I_KEY_OUNR, req) : \ 447 TLS_UNR(TLS_I_KEY_UNR, req)) 448 449 /* 450 ** TLS_SAFE_F -- macro to simplify calls to tls_safe_f 451 ** 452 ** Parameters: 453 ** var -- filename 454 ** sff -- flags for safefile() 455 ** req -- is the file required? 456 ** ex -- does the file exist? 457 ** st -- status bit to set if ok 458 ** srv -- server side? 459 ** 460 ** Side Effects: 461 ** uses r, ok, ex; may change ok and status. 462 ** 463 */ 464 465 # define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \ 466 { \ 467 r = tls_safe_f(var, sff, srv); \ 468 if (r) \ 469 status |= st; \ 470 else if (req) \ 471 ok = false; \ 472 } 473 474 /* 475 ** INITTLS -- initialize TLS 476 ** 477 ** Parameters: 478 ** ctx -- pointer to context 479 ** req -- requirements for initialization (see sendmail.h) 480 ** srv -- server side? 481 ** certfile -- filename of certificate 482 ** keyfile -- filename of private key 483 ** cacertpath -- path to CAs 484 ** cacertfile -- file with CA(s) 485 ** dhparam -- parameters for DH 486 ** 487 ** Returns: 488 ** succeeded? 489 */ 490 491 bool 492 inittls(ctx, req, srv, certfile, keyfile, cacertpath, cacertfile, dhparam) 493 SSL_CTX **ctx; 494 unsigned long req; 495 bool srv; 496 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam; 497 { 498 # if !NO_DH 499 static DH *dh = NULL; 500 # endif /* !NO_DH */ 501 int r; 502 bool ok; 503 long sff, status; 504 char *who; 505 # if _FFR_TLS_1 506 char *cf2, *kf2; 507 # endif /* _FFR_TLS_1 */ 508 # if SM_CONF_SHM 509 extern int ShmId; 510 # endif /* SM_CONF_SHM */ 511 512 status = TLS_S_NONE; 513 who = srv ? "server" : "client"; 514 if (ctx == NULL) 515 syserr("STARTTLS=%s, inittls: ctx == NULL", who); 516 517 /* already initialized? (we could re-init...) */ 518 if (*ctx != NULL) 519 return true; 520 ok = true; 521 522 # if _FFR_TLS_1 523 /* 524 ** look for a second filename: it must be separated by a ',' 525 ** no blanks allowed (they won't be skipped). 526 ** we change a global variable here! this change will be undone 527 ** before return from the function but only if it returns true. 528 ** this isn't a problem since in a failure case this function 529 ** won't be called again with the same (overwritten) values. 530 ** otherwise each return must be replaced with a goto endinittls. 531 */ 532 533 cf2 = NULL; 534 kf2 = NULL; 535 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL) 536 { 537 *cf2++ = '\0'; 538 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL) 539 *kf2++ = '\0'; 540 } 541 # endif /* _FFR_TLS_1 */ 542 543 /* 544 ** Check whether files/paths are defined 545 */ 546 547 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 548 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT); 549 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 550 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT); 551 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req), 552 TLS_S_CERTP_EX, TLS_T_OTHER); 553 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req), 554 TLS_S_CERTF_EX, TLS_T_OTHER); 555 556 # if _FFR_TLS_1 557 /* 558 ** if the second file is specified it must exist 559 ** XXX: it is possible here to define only one of those files 560 */ 561 562 if (cf2 != NULL) 563 { 564 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req), 565 TLS_S_CERT2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 566 } 567 if (kf2 != NULL) 568 { 569 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req), 570 TLS_S_KEY2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 571 } 572 # endif /* _FFR_TLS_1 */ 573 574 /* 575 ** valid values for dhparam are (only the first char is checked) 576 ** none no parameters: don't use DH 577 ** 512 generate 512 bit parameters (fixed) 578 ** 1024 generate 1024 bit parameters 579 ** /file/name read parameters from /file/name 580 ** default is: 1024 for server, 512 for client (OK? XXX) 581 */ 582 583 if (bitset(TLS_I_TRY_DH, req)) 584 { 585 if (dhparam != NULL) 586 { 587 char c = *dhparam; 588 589 if (c == '1') 590 req |= TLS_I_DH1024; 591 else if (c == '5') 592 req |= TLS_I_DH512; 593 else if (c != 'n' && c != 'N' && c != '/') 594 { 595 if (LogLevel > 12) 596 sm_syslog(LOG_WARNING, NOQID, 597 "STARTTLS=%s, error: illegal value '%s' for DHParam", 598 who, dhparam); 599 dhparam = NULL; 600 } 601 } 602 if (dhparam == NULL) 603 dhparam = srv ? "1" : "5"; 604 else if (*dhparam == '/') 605 { 606 TLS_OK_F(dhparam, "DHParameters", 607 bitset(TLS_I_DHPAR_EX, req), 608 TLS_S_DHPAR_EX, TLS_T_OTHER); 609 } 610 } 611 if (!ok) 612 return ok; 613 614 /* certfile etc. must be "safe". */ 615 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 616 | SFF_NOGWFILES | SFF_NOWWFILES 617 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 618 if (DontLockReadFiles) 619 sff |= SFF_NOLOCK; 620 621 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 622 bitset(TLS_I_CERT_EX, req), 623 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 624 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 625 bitset(TLS_I_KEY_EX, req), 626 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 627 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req), 628 bitset(TLS_I_CERTF_EX, req), 629 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv); 630 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req), 631 bitset(TLS_I_DHPAR_EX, req), 632 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv); 633 if (!ok) 634 return ok; 635 # if _FFR_TLS_1 636 if (cf2 != NULL) 637 { 638 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req), 639 bitset(TLS_I_CERT_EX, req), 640 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv); 641 } 642 if (kf2 != NULL) 643 { 644 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req), 645 bitset(TLS_I_KEY_EX, req), 646 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv); 647 } 648 # endif /* _FFR_TLS_1 */ 649 650 /* create a method and a new context */ 651 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() : 652 SSLv23_client_method())) == NULL) 653 { 654 if (LogLevel > 7) 655 sm_syslog(LOG_WARNING, NOQID, 656 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed", 657 who, who); 658 if (LogLevel > 9) 659 tlslogerr(who); 660 return false; 661 } 662 663 # if TLS_NO_RSA 664 /* turn off backward compatibility, required for no-rsa */ 665 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2); 666 # endif /* TLS_NO_RSA */ 667 668 669 # if !TLS_NO_RSA 670 /* 671 ** Create a temporary RSA key 672 ** XXX Maybe we shouldn't create this always (even though it 673 ** is only at startup). 674 ** It is a time-consuming operation and it is not always necessary. 675 ** maybe we should do it only on demand... 676 */ 677 678 if (bitset(TLS_I_RSA_TMP, req) 679 # if SM_CONF_SHM 680 && ShmId != SM_SHM_NO_ID && 681 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, 682 NULL)) == NULL 683 # else /* SM_CONF_SHM */ 684 && 0 /* no shared memory: no need to generate key now */ 685 # endif /* SM_CONF_SHM */ 686 ) 687 { 688 if (LogLevel > 7) 689 { 690 sm_syslog(LOG_WARNING, NOQID, 691 "STARTTLS=%s, error: RSA_generate_key failed", 692 who); 693 if (LogLevel > 9) 694 tlslogerr(who); 695 } 696 return false; 697 } 698 # endif /* !TLS_NO_RSA */ 699 700 /* 701 ** load private key 702 ** XXX change this for DSA-only version 703 */ 704 705 if (bitset(TLS_S_KEY_OK, status) && 706 SSL_CTX_use_PrivateKey_file(*ctx, keyfile, 707 SSL_FILETYPE_PEM) <= 0) 708 { 709 if (LogLevel > 7) 710 { 711 sm_syslog(LOG_WARNING, NOQID, 712 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 713 who, keyfile); 714 if (LogLevel > 9) 715 tlslogerr(who); 716 } 717 if (bitset(TLS_I_USE_KEY, req)) 718 return false; 719 } 720 721 /* get the certificate file */ 722 if (bitset(TLS_S_CERT_OK, status) && 723 SSL_CTX_use_certificate_file(*ctx, certfile, 724 SSL_FILETYPE_PEM) <= 0) 725 { 726 if (LogLevel > 7) 727 { 728 sm_syslog(LOG_WARNING, NOQID, 729 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 730 who, certfile); 731 if (LogLevel > 9) 732 tlslogerr(who); 733 } 734 if (bitset(TLS_I_USE_CERT, req)) 735 return false; 736 } 737 738 /* check the private key */ 739 if (bitset(TLS_S_KEY_OK, status) && 740 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 741 { 742 /* Private key does not match the certificate public key */ 743 if (LogLevel > 5) 744 { 745 sm_syslog(LOG_WARNING, NOQID, 746 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d", 747 who, keyfile, r); 748 if (LogLevel > 9) 749 tlslogerr(who); 750 } 751 if (bitset(TLS_I_USE_KEY, req)) 752 return false; 753 } 754 755 # if _FFR_TLS_1 756 /* XXX this code is pretty much duplicated from above! */ 757 758 /* load private key */ 759 if (bitset(TLS_S_KEY2_OK, status) && 760 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0) 761 { 762 if (LogLevel > 7) 763 { 764 sm_syslog(LOG_WARNING, NOQID, 765 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 766 who, kf2); 767 if (LogLevel > 9) 768 tlslogerr(who); 769 } 770 } 771 772 /* get the certificate file */ 773 if (bitset(TLS_S_CERT2_OK, status) && 774 SSL_CTX_use_certificate_file(*ctx, cf2, SSL_FILETYPE_PEM) <= 0) 775 { 776 if (LogLevel > 7) 777 { 778 sm_syslog(LOG_WARNING, NOQID, 779 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 780 who, cf2); 781 if (LogLevel > 9) 782 tlslogerr(who); 783 } 784 } 785 786 /* also check the private key */ 787 if (bitset(TLS_S_KEY2_OK, status) && 788 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 789 { 790 /* Private key does not match the certificate public key */ 791 if (LogLevel > 5) 792 { 793 sm_syslog(LOG_WARNING, NOQID, 794 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d", 795 who, r); 796 if (LogLevel > 9) 797 tlslogerr(who); 798 } 799 } 800 # endif /* _FFR_TLS_1 */ 801 802 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */ 803 SSL_CTX_set_options(*ctx, SSL_OP_ALL); /* XXX bug compatibility? */ 804 805 # if !NO_DH 806 /* Diffie-Hellman initialization */ 807 if (bitset(TLS_I_TRY_DH, req)) 808 { 809 if (bitset(TLS_S_DHPAR_OK, status)) 810 { 811 BIO *bio; 812 813 if ((bio = BIO_new_file(dhparam, "r")) != NULL) 814 { 815 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 816 BIO_free(bio); 817 if (dh == NULL && LogLevel > 7) 818 { 819 unsigned long err; 820 821 err = ERR_get_error(); 822 sm_syslog(LOG_WARNING, NOQID, 823 "STARTTLS=%s, error: cannot read DH parameters(%s): %s", 824 who, dhparam, 825 ERR_error_string(err, NULL)); 826 if (LogLevel > 9) 827 tlslogerr(who); 828 } 829 } 830 else 831 { 832 if (LogLevel > 5) 833 { 834 sm_syslog(LOG_WARNING, NOQID, 835 "STARTTLS=%s, error: BIO_new_file(%s) failed", 836 who, dhparam); 837 if (LogLevel > 9) 838 tlslogerr(who); 839 } 840 } 841 } 842 if (dh == NULL && bitset(TLS_I_DH1024, req)) 843 { 844 DSA *dsa; 845 846 /* this takes a while! (7-130s on a 450MHz AMD K6-2) */ 847 dsa = DSA_generate_parameters(1024, NULL, 0, NULL, 848 NULL, 0, NULL); 849 dh = DSA_dup_DH(dsa); 850 DSA_free(dsa); 851 } 852 else 853 if (dh == NULL && bitset(TLS_I_DH512, req)) 854 dh = get_dh512(); 855 856 if (dh == NULL) 857 { 858 if (LogLevel > 9) 859 { 860 unsigned long err; 861 862 err = ERR_get_error(); 863 sm_syslog(LOG_WARNING, NOQID, 864 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s", 865 who, dhparam, 866 ERR_error_string(err, NULL)); 867 } 868 if (bitset(TLS_I_REQ_DH, req)) 869 return false; 870 } 871 else 872 { 873 SSL_CTX_set_tmp_dh(*ctx, dh); 874 875 /* important to avoid small subgroup attacks */ 876 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE); 877 if (LogLevel > 13) 878 sm_syslog(LOG_INFO, NOQID, 879 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)", 880 who, 8 * DH_size(dh), *dhparam); 881 DH_free(dh); 882 } 883 } 884 # endif /* !NO_DH */ 885 886 887 /* XXX do we need this cache here? */ 888 if (bitset(TLS_I_CACHE, req)) 889 SSL_CTX_sess_set_cache_size(*ctx, 128); 890 /* timeout? SSL_CTX_set_timeout(*ctx, TimeOut...); */ 891 892 /* load certificate locations and default CA paths */ 893 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status)) 894 { 895 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile, 896 cacertpath)) == 1) 897 { 898 # if !TLS_NO_RSA 899 if (bitset(TLS_I_RSA_TMP, req)) 900 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key); 901 # endif /* !TLS_NO_RSA */ 902 903 /* 904 ** We have to install our own verify callback: 905 ** SSL_VERIFY_PEER requests a client cert but even 906 ** though *FAIL_IF* isn't set, the connection 907 ** will be aborted if the client presents a cert 908 ** that is not "liked" (can't be verified?) by 909 ** the TLS library :-( 910 */ 911 912 /* 913 ** XXX currently we could call tls_set_verify() 914 ** but we hope that that function will later on 915 ** only set the mode per connection. 916 */ 917 SSL_CTX_set_verify(*ctx, 918 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE 919 : SSL_VERIFY_PEER, 920 NULL); 921 922 /* install verify callback */ 923 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb, 924 NULL); 925 SSL_CTX_set_client_CA_list(*ctx, 926 SSL_load_client_CA_file(cacertfile)); 927 } 928 else 929 { 930 /* 931 ** can't load CA data; do we care? 932 ** the data is necessary to authenticate the client, 933 ** which in turn would be necessary 934 ** if we want to allow relaying based on it. 935 */ 936 if (LogLevel > 5) 937 { 938 sm_syslog(LOG_WARNING, NOQID, 939 "STARTTLS=%s, error: load verify locs %s, %s failed: %d", 940 who, cacertpath, cacertfile, r); 941 if (LogLevel > 9) 942 tlslogerr(who); 943 } 944 if (bitset(TLS_I_VRFY_LOC, req)) 945 return false; 946 } 947 } 948 949 /* XXX: make this dependent on an option? */ 950 if (tTd(96, 9)) 951 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb); 952 953 # if _FFR_TLS_1 954 /* install our own cipher list */ 955 if (CipherList != NULL && *CipherList != '\0') 956 { 957 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0) 958 { 959 if (LogLevel > 7) 960 { 961 sm_syslog(LOG_WARNING, NOQID, 962 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored", 963 who, CipherList); 964 965 if (LogLevel > 9) 966 tlslogerr(who); 967 } 968 /* failure if setting to this list is required? */ 969 } 970 } 971 # endif /* _FFR_TLS_1 */ 972 if (LogLevel > 12) 973 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok); 974 975 # if _FFR_TLS_1 976 # if 0 977 /* 978 ** this label is required if we want to have a "clean" exit 979 ** see the comments above at the initialization of cf2 980 */ 981 982 endinittls: 983 # endif /* 0 */ 984 985 /* undo damage to global variables */ 986 if (cf2 != NULL) 987 *--cf2 = ','; 988 if (kf2 != NULL) 989 *--kf2 = ','; 990 # endif /* _FFR_TLS_1 */ 991 992 return ok; 993 } 994 /* 995 ** TLS_GET_INFO -- get information about TLS connection 996 ** 997 ** Parameters: 998 ** ssl -- TLS connection structure 999 ** srv -- server or client 1000 ** host -- hostname of other side 1001 ** mac -- macro storage 1002 ** certreq -- did we ask for a cert? 1003 ** 1004 ** Returns: 1005 ** result of authentication. 1006 ** 1007 ** Side Effects: 1008 ** sets macros: {cipher}, {tls_version}, {verify}, 1009 ** {cipher_bits}, {alg_bits}, {cert}, {cert_subject}, 1010 ** {cert_issuer}, {cn_subject}, {cn_issuer} 1011 */ 1012 1013 int 1014 tls_get_info(ssl, srv, host, mac, certreq) 1015 SSL *ssl; 1016 bool srv; 1017 char *host; 1018 MACROS_T *mac; 1019 bool certreq; 1020 { 1021 SSL_CIPHER *c; 1022 int b, r; 1023 char *s, *who; 1024 char bitstr[16]; 1025 X509 *cert; 1026 1027 c = SSL_get_current_cipher(ssl); 1028 1029 /* cast is just workaround for compiler warning */ 1030 macdefine(mac, A_TEMP, macid("{cipher}"), 1031 (char *) SSL_CIPHER_get_name(c)); 1032 b = SSL_CIPHER_get_bits(c, &r); 1033 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", b); 1034 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr); 1035 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", r); 1036 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr); 1037 s = SSL_CIPHER_get_version(c); 1038 if (s == NULL) 1039 s = "UNKNOWN"; 1040 macdefine(mac, A_TEMP, macid("{tls_version}"), s); 1041 1042 who = srv ? "server" : "client"; 1043 cert = SSL_get_peer_certificate(ssl); 1044 if (LogLevel > 14) 1045 sm_syslog(LOG_INFO, NOQID, 1046 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx", 1047 who, SSL_get_verify_result(ssl), 1048 (unsigned long) cert); 1049 if (cert != NULL) 1050 { 1051 unsigned int n; 1052 unsigned char md[EVP_MAX_MD_SIZE]; 1053 char buf[MAXNAME]; 1054 1055 X509_NAME_oneline(X509_get_subject_name(cert), 1056 buf, sizeof buf); 1057 macdefine(mac, A_TEMP, macid("{cert_subject}"), 1058 xtextify(buf, "<>\")")); 1059 X509_NAME_oneline(X509_get_issuer_name(cert), 1060 buf, sizeof buf); 1061 macdefine(mac, A_TEMP, macid("{cert_issuer}"), 1062 xtextify(buf, "<>\")")); 1063 X509_NAME_get_text_by_NID(X509_get_subject_name(cert), 1064 NID_commonName, buf, sizeof buf); 1065 macdefine(mac, A_TEMP, macid("{cn_subject}"), 1066 xtextify(buf, "<>\")")); 1067 X509_NAME_get_text_by_NID(X509_get_issuer_name(cert), 1068 NID_commonName, buf, sizeof buf); 1069 macdefine(mac, A_TEMP, macid("{cn_issuer}"), 1070 xtextify(buf, "<>\")")); 1071 if (X509_digest(cert, EVP_md5(), md, &n)) 1072 { 1073 char md5h[EVP_MAX_MD_SIZE * 3]; 1074 static const char hexcodes[] = "0123456789ABCDEF"; 1075 1076 SM_ASSERT((n * 3) + 2 < sizeof(md5h)); 1077 for (r = 0; r < (int) n; r++) 1078 { 1079 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4]; 1080 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)]; 1081 md5h[(r * 3) + 2] = ':'; 1082 } 1083 md5h[(n * 3) - 1] = '\0'; 1084 macdefine(mac, A_TEMP, macid("{cert_md5}"), md5h); 1085 } 1086 else 1087 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1088 } 1089 else 1090 { 1091 macdefine(mac, A_PERM, macid("{cert_subject}"), ""); 1092 macdefine(mac, A_PERM, macid("{cert_issuer}"), ""); 1093 macdefine(mac, A_PERM, macid("{cn_subject}"), ""); 1094 macdefine(mac, A_PERM, macid("{cn_issuer}"), ""); 1095 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1096 } 1097 switch (SSL_get_verify_result(ssl)) 1098 { 1099 case X509_V_OK: 1100 if (cert != NULL) 1101 { 1102 s = "OK"; 1103 r = TLS_AUTH_OK; 1104 } 1105 else 1106 { 1107 s = certreq ? "NO" : "NOT", 1108 r = TLS_AUTH_NO; 1109 } 1110 break; 1111 default: 1112 s = "FAIL"; 1113 r = TLS_AUTH_FAIL; 1114 break; 1115 } 1116 macdefine(mac, A_PERM, macid("{verify}"), s); 1117 if (cert != NULL) 1118 X509_free(cert); 1119 1120 /* do some logging */ 1121 if (LogLevel > 8) 1122 { 1123 char *vers, *s1, *s2, *cbits, *algbits; 1124 1125 vers = macget(mac, macid("{tls_version}")); 1126 cbits = macget(mac, macid("{cipher_bits}")); 1127 algbits = macget(mac, macid("{alg_bits}")); 1128 s1 = macget(mac, macid("{verify}")); 1129 s2 = macget(mac, macid("{cipher}")); 1130 1131 /* XXX: maybe cut off ident info? */ 1132 sm_syslog(LOG_INFO, NOQID, 1133 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s", 1134 who, 1135 host == NULL ? "local" : host, 1136 vers, s1, s2, /* sm_snprintf() can deal with NULL */ 1137 algbits == NULL ? "0" : algbits, 1138 cbits == NULL ? "0" : cbits); 1139 if (LogLevel > 11) 1140 { 1141 /* 1142 ** Maybe run xuntextify on the strings? 1143 ** That is easier to read but makes it maybe a bit 1144 ** more complicated to figure out the right values 1145 ** for the access map... 1146 */ 1147 1148 s1 = macget(mac, macid("{cert_subject}")); 1149 s2 = macget(mac, macid("{cert_issuer}")); 1150 sm_syslog(LOG_INFO, NOQID, 1151 "STARTTLS=%s, cert-subject=%.128s, cert-issuer=%.128s", 1152 who, s1, s2); 1153 } 1154 } 1155 return r; 1156 } 1157 /* 1158 ** ENDTLS -- shutdown secure connection 1159 ** 1160 ** Parameters: 1161 ** ssl -- SSL connection information. 1162 ** side -- server/client (for logging). 1163 ** 1164 ** Returns: 1165 ** success? (EX_* code) 1166 */ 1167 1168 int 1169 endtls(ssl, side) 1170 SSL *ssl; 1171 char *side; 1172 { 1173 int ret = EX_OK; 1174 1175 if (ssl != NULL) 1176 { 1177 int r; 1178 1179 if ((r = SSL_shutdown(ssl)) < 0) 1180 { 1181 if (LogLevel > 11) 1182 { 1183 sm_syslog(LOG_WARNING, NOQID, 1184 "STARTTLS=%s, SSL_shutdown failed: %d", 1185 side, r); 1186 tlslogerr(side); 1187 } 1188 ret = EX_SOFTWARE; 1189 } 1190 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL 1191 1192 /* 1193 ** Bug in OpenSSL (at least up to 0.9.6b): 1194 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE 1195 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de> 1196 ** To: openssl-users@openssl.org 1197 ** Subject: Re: SSL_shutdown() woes (fwd) 1198 ** 1199 ** The side sending the shutdown alert first will 1200 ** not care about the answer of the peer but will 1201 ** immediately return with a return value of "0" 1202 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate 1203 ** the value of "0" and as the shutdown alert of the peer was 1204 ** not received (actually, the program did not even wait for 1205 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this 1206 ** is the default rule in case everything else does not apply. 1207 ** 1208 ** For your server the problem is different, because it 1209 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN), 1210 ** then sends its response (SSL_SENT_SHUTDOWN), so for the 1211 ** server the shutdown was successfull. 1212 ** 1213 ** As is by know, you would have to call SSL_shutdown() once 1214 ** and ignore an SSL_ERROR_SYSCALL returned. Then call 1215 ** SSL_shutdown() again to actually get the server's response. 1216 ** 1217 ** In the last discussion, Bodo Moeller concluded that a 1218 ** rewrite of the shutdown code would be necessary, but 1219 ** probably with another API, as the change would not be 1220 ** compatible to the way it is now. Things do not become 1221 ** easier as other programs do not follow the shutdown 1222 ** guidelines anyway, so that a lot error conditions and 1223 ** compitibility issues would have to be caught. 1224 ** 1225 ** For now the recommondation is to ignore the error message. 1226 */ 1227 1228 else if (r == 0) 1229 { 1230 if (LogLevel > 15) 1231 { 1232 sm_syslog(LOG_WARNING, NOQID, 1233 "STARTTLS=%s, SSL_shutdown not done", 1234 side); 1235 tlslogerr(side); 1236 } 1237 ret = EX_SOFTWARE; 1238 } 1239 # endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */ 1240 SSL_free(ssl); 1241 ssl = NULL; 1242 } 1243 return ret; 1244 } 1245 1246 # if !TLS_NO_RSA 1247 /* 1248 ** TMP_RSA_KEY -- return temporary RSA key 1249 ** 1250 ** Parameters: 1251 ** s -- TLS connection structure 1252 ** export -- 1253 ** keylength -- 1254 ** 1255 ** Returns: 1256 ** temporary RSA key. 1257 */ 1258 1259 # ifndef MAX_RSA_TMP_CNT 1260 # define MAX_RSA_TMP_CNT 1000 /* XXX better value? */ 1261 # endif /* ! MAX_RSA_TMP_CNT */ 1262 1263 /* ARGUSED0 */ 1264 static RSA * 1265 tmp_rsa_key(s, export, keylength) 1266 SSL *s; 1267 int export; 1268 int keylength; 1269 { 1270 # if SM_CONF_SHM 1271 extern int ShmId; 1272 extern int *PRSATmpCnt; 1273 1274 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL && 1275 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT) 1276 return rsa_tmp; 1277 # endif /* SM_CONF_SHM */ 1278 1279 if (rsa_tmp != NULL) 1280 RSA_free(rsa_tmp); 1281 rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, NULL); 1282 if (rsa_tmp == NULL) 1283 { 1284 if (LogLevel > 0) 1285 sm_syslog(LOG_ERR, NOQID, 1286 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!"); 1287 } 1288 else 1289 { 1290 # if SM_CONF_SHM 1291 # if 0 1292 /* 1293 ** XXX we can't (yet) share the new key... 1294 ** The RSA structure contains pointers hence it can't be 1295 ** easily kept in shared memory. It must be transformed 1296 ** into a continous memory region first, then stored, 1297 ** and later read out again (each time re-transformed). 1298 */ 1299 1300 if (ShmId != SM_SHM_NO_ID) 1301 *PRSATmpCnt = 0; 1302 # endif /* 0 */ 1303 # endif /* SM_CONF_SHM */ 1304 if (LogLevel > 9) 1305 sm_syslog(LOG_ERR, NOQID, 1306 "STARTTLS=server, tmp_rsa_key: new temp RSA key"); 1307 } 1308 return rsa_tmp; 1309 } 1310 # endif /* !TLS_NO_RSA */ 1311 /* 1312 ** APPS_SSL_INFO_CB -- info callback for TLS connections 1313 ** 1314 ** Parameters: 1315 ** s -- TLS connection structure 1316 ** where -- state in handshake 1317 ** ret -- return code of last operation 1318 ** 1319 ** Returns: 1320 ** none. 1321 */ 1322 1323 static void 1324 apps_ssl_info_cb(s, where, ret) 1325 CONST097 SSL *s; 1326 int where; 1327 int ret; 1328 { 1329 int w; 1330 char *str; 1331 BIO *bio_err = NULL; 1332 1333 if (LogLevel > 14) 1334 sm_syslog(LOG_INFO, NOQID, 1335 "STARTTLS: info_callback where=0x%x, ret=%d", 1336 where, ret); 1337 1338 w = where & ~SSL_ST_MASK; 1339 if (bio_err == NULL) 1340 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); 1341 1342 if (bitset(SSL_ST_CONNECT, w)) 1343 str = "SSL_connect"; 1344 else if (bitset(SSL_ST_ACCEPT, w)) 1345 str = "SSL_accept"; 1346 else 1347 str = "undefined"; 1348 1349 if (bitset(SSL_CB_LOOP, where)) 1350 { 1351 if (LogLevel > 12) 1352 sm_syslog(LOG_NOTICE, NOQID, 1353 "STARTTLS: %s:%s", 1354 str, SSL_state_string_long(s)); 1355 } 1356 else if (bitset(SSL_CB_ALERT, where)) 1357 { 1358 str = bitset(SSL_CB_READ, where) ? "read" : "write"; 1359 if (LogLevel > 12) 1360 sm_syslog(LOG_NOTICE, NOQID, 1361 "STARTTLS: SSL3 alert %s:%s:%s", 1362 str, SSL_alert_type_string_long(ret), 1363 SSL_alert_desc_string_long(ret)); 1364 } 1365 else if (bitset(SSL_CB_EXIT, where)) 1366 { 1367 if (ret == 0) 1368 { 1369 if (LogLevel > 7) 1370 sm_syslog(LOG_WARNING, NOQID, 1371 "STARTTLS: %s:failed in %s", 1372 str, SSL_state_string_long(s)); 1373 } 1374 else if (ret < 0) 1375 { 1376 if (LogLevel > 7) 1377 sm_syslog(LOG_WARNING, NOQID, 1378 "STARTTLS: %s:error in %s", 1379 str, SSL_state_string_long(s)); 1380 } 1381 } 1382 } 1383 /* 1384 ** TLS_VERIFY_LOG -- log verify error for TLS certificates 1385 ** 1386 ** Parameters: 1387 ** ok -- verify ok? 1388 ** ctx -- x509 context 1389 ** 1390 ** Returns: 1391 ** 0 -- fatal error 1392 ** 1 -- ok 1393 */ 1394 1395 static int 1396 tls_verify_log(ok, ctx) 1397 int ok; 1398 X509_STORE_CTX *ctx; 1399 { 1400 SSL *ssl; 1401 X509 *cert; 1402 int reason, depth; 1403 char buf[512]; 1404 1405 cert = X509_STORE_CTX_get_current_cert(ctx); 1406 reason = X509_STORE_CTX_get_error(ctx); 1407 depth = X509_STORE_CTX_get_error_depth(ctx); 1408 ssl = (SSL *) X509_STORE_CTX_get_ex_data(ctx, 1409 SSL_get_ex_data_X509_STORE_CTX_idx()); 1410 1411 if (ssl == NULL) 1412 { 1413 /* internal error */ 1414 sm_syslog(LOG_ERR, NOQID, 1415 "STARTTLS: internal error: tls_verify_cb: ssl == NULL"); 1416 return 0; 1417 } 1418 1419 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof buf); 1420 sm_syslog(LOG_INFO, NOQID, 1421 "STARTTLS: cert verify: depth=%d %s, state=%d, reason=%s", 1422 depth, buf, ok, X509_verify_cert_error_string(reason)); 1423 return 1; 1424 } 1425 /* 1426 ** TLS_VERIFY_CB -- verify callback for TLS certificates 1427 ** 1428 ** Parameters: 1429 ** ctx -- x509 context 1430 ** 1431 ** Returns: 1432 ** accept connection? 1433 ** currently: always yes. 1434 */ 1435 1436 static int 1437 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 1438 tls_verify_cb(ctx) 1439 X509_STORE_CTX *ctx; 1440 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1441 tls_verify_cb(ctx, unused) 1442 X509_STORE_CTX *ctx; 1443 void *unused; 1444 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1445 { 1446 int ok; 1447 1448 ok = X509_verify_cert(ctx); 1449 if (ok == 0) 1450 { 1451 if (LogLevel > 13) 1452 return tls_verify_log(ok, ctx); 1453 return 1; /* override it */ 1454 } 1455 return ok; 1456 } 1457 /* 1458 ** TLSLOGERR -- log the errors from the TLS error stack 1459 ** 1460 ** Parameters: 1461 ** who -- server/client (for logging). 1462 ** 1463 ** Returns: 1464 ** none. 1465 */ 1466 1467 void 1468 tlslogerr(who) 1469 char *who; 1470 { 1471 unsigned long l; 1472 int line, flags; 1473 unsigned long es; 1474 char *file, *data; 1475 char buf[256]; 1476 # define CP (const char **) 1477 1478 es = CRYPTO_thread_id(); 1479 while ((l = ERR_get_error_line_data(CP &file, &line, CP &data, &flags)) 1480 != 0) 1481 { 1482 sm_syslog(LOG_WARNING, NOQID, 1483 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es, 1484 ERR_error_string(l, buf), 1485 file, line, 1486 bitset(ERR_TXT_STRING, flags) ? data : ""); 1487 } 1488 } 1489 #endif /* STARTTLS */ 1490