1 /* 2 * Copyright (c) 2000-2004 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 8.96 2004/08/04 21:17:58 ca 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 OPENSSL_VERSION_NUMBER > 0x00907000L 33 static int x509_verify_cb __P((int, X509_STORE_CTX *)); 34 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 35 36 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 37 # define CONST097 38 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 39 # define CONST097 const 40 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 41 static void apps_ssl_info_cb __P((CONST097 SSL *, int , int)); 42 static bool tls_ok_f __P((char *, char *, int)); 43 static bool tls_safe_f __P((char *, long, bool)); 44 static int tls_verify_log __P((int, X509_STORE_CTX *, char *)); 45 46 # if !NO_DH 47 static DH *get_dh512 __P((void)); 48 49 static unsigned char dh512_p[] = 50 { 51 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75, 52 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F, 53 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3, 54 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12, 55 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C, 56 0x47,0x74,0xE8,0x33 57 }; 58 static unsigned char dh512_g[] = 59 { 60 0x02 61 }; 62 63 static DH * 64 get_dh512() 65 { 66 DH *dh = NULL; 67 68 if ((dh = DH_new()) == NULL) 69 return NULL; 70 dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL); 71 dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL); 72 if ((dh->p == NULL) || (dh->g == NULL)) 73 return NULL; 74 return dh; 75 } 76 # endif /* !NO_DH */ 77 78 79 /* 80 ** TLS_RAND_INIT -- initialize STARTTLS random generator 81 ** 82 ** Parameters: 83 ** randfile -- name of file with random data 84 ** logl -- loglevel 85 ** 86 ** Returns: 87 ** success/failure 88 ** 89 ** Side Effects: 90 ** initializes PRNG for tls library. 91 */ 92 93 # define MIN_RAND_BYTES 128 /* 1024 bits */ 94 95 # define RF_OK 0 /* randfile OK */ 96 # define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */ 97 # define RF_UNKNOWN 2 /* unknown prefix for randfile */ 98 99 # define RI_NONE 0 /* no init yet */ 100 # define RI_SUCCESS 1 /* init was successful */ 101 # define RI_FAIL 2 /* init failed */ 102 103 static bool tls_rand_init __P((char *, int)); 104 105 static bool 106 tls_rand_init(randfile, logl) 107 char *randfile; 108 int logl; 109 { 110 # ifndef HASURANDOMDEV 111 /* not required if /dev/urandom exists, OpenSSL does it internally */ 112 113 bool ok; 114 int randdef; 115 static int done = RI_NONE; 116 117 /* 118 ** initialize PRNG 119 */ 120 121 /* did we try this before? if yes: return old value */ 122 if (done != RI_NONE) 123 return done == RI_SUCCESS; 124 125 /* set default values */ 126 ok = false; 127 done = RI_FAIL; 128 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK; 129 # if EGD 130 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0) 131 { 132 randfile += 4; 133 if (RAND_egd(randfile) < 0) 134 { 135 sm_syslog(LOG_WARNING, NOQID, 136 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded", 137 randfile); 138 } 139 else 140 ok = true; 141 } 142 else 143 # endif /* EGD */ 144 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0) 145 { 146 int fd; 147 long sff; 148 struct stat st; 149 150 randfile += 5; 151 sff = SFF_SAFEDIRPATH | SFF_NOWLINK 152 | SFF_NOGWFILES | SFF_NOWWFILES 153 | SFF_NOGRFILES | SFF_NOWRFILES 154 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 155 if (DontLockReadFiles) 156 sff |= SFF_NOLOCK; 157 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0) 158 { 159 if (fstat(fd, &st) < 0) 160 { 161 if (LogLevel > logl) 162 sm_syslog(LOG_ERR, NOQID, 163 "STARTTLS: can't fstat(%s)", 164 randfile); 165 } 166 else 167 { 168 bool use, problem; 169 170 use = true; 171 problem = false; 172 173 /* max. age of file: 10 minutes */ 174 if (st.st_mtime + 600 < curtime()) 175 { 176 use = bitnset(DBS_INSUFFICIENTENTROPY, 177 DontBlameSendmail); 178 problem = true; 179 if (LogLevel > logl) 180 sm_syslog(LOG_ERR, NOQID, 181 "STARTTLS: RandFile %s too old: %s", 182 randfile, 183 use ? "unsafe" : 184 "unusable"); 185 } 186 if (use && st.st_size < MIN_RAND_BYTES) 187 { 188 use = bitnset(DBS_INSUFFICIENTENTROPY, 189 DontBlameSendmail); 190 problem = true; 191 if (LogLevel > logl) 192 sm_syslog(LOG_ERR, NOQID, 193 "STARTTLS: size(%s) < %d: %s", 194 randfile, 195 MIN_RAND_BYTES, 196 use ? "unsafe" : 197 "unusable"); 198 } 199 if (use) 200 ok = RAND_load_file(randfile, -1) >= 201 MIN_RAND_BYTES; 202 if (use && !ok) 203 { 204 if (LogLevel > logl) 205 sm_syslog(LOG_WARNING, NOQID, 206 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded", 207 randfile); 208 } 209 if (problem) 210 ok = false; 211 } 212 if (ok || bitnset(DBS_INSUFFICIENTENTROPY, 213 DontBlameSendmail)) 214 { 215 /* add this even if fstat() failed */ 216 RAND_seed((void *) &st, sizeof st); 217 } 218 (void) close(fd); 219 } 220 else 221 { 222 if (LogLevel > logl) 223 sm_syslog(LOG_WARNING, NOQID, 224 "STARTTLS: Warning: safeopen(%s) failed", 225 randfile); 226 } 227 } 228 else if (randdef == RF_OK) 229 { 230 if (LogLevel > logl) 231 sm_syslog(LOG_WARNING, NOQID, 232 "STARTTLS: Error: no proper random file definition %s", 233 randfile); 234 randdef = RF_UNKNOWN; 235 } 236 if (randdef == RF_MISS) 237 { 238 if (LogLevel > logl) 239 sm_syslog(LOG_WARNING, NOQID, 240 "STARTTLS: Error: missing random file definition"); 241 } 242 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail)) 243 { 244 int i; 245 long r; 246 unsigned char buf[MIN_RAND_BYTES]; 247 248 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */ 249 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long)) 250 { 251 r = get_random(); 252 (void) memcpy(buf + i, (void *) &r, sizeof(long)); 253 } 254 RAND_seed(buf, sizeof buf); 255 if (LogLevel > logl) 256 sm_syslog(LOG_WARNING, NOQID, 257 "STARTTLS: Warning: random number generator not properly seeded"); 258 ok = true; 259 } 260 done = ok ? RI_SUCCESS : RI_FAIL; 261 return ok; 262 # else /* ! HASURANDOMDEV */ 263 return true; 264 # endif /* ! HASURANDOMDEV */ 265 } 266 /* 267 ** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use. 268 ** 269 ** Parameters: 270 ** none. 271 ** 272 ** Returns: 273 ** succeeded? 274 */ 275 276 bool 277 init_tls_library() 278 { 279 /* basic TLS initialization, ignore result for now */ 280 SSL_library_init(); 281 SSL_load_error_strings(); 282 # if 0 283 /* this is currently a macro for SSL_library_init */ 284 SSLeay_add_ssl_algorithms(); 285 # endif /* 0 */ 286 287 return tls_rand_init(RandFile, 7); 288 } 289 /* 290 ** TLS_SET_VERIFY -- request client certificate? 291 ** 292 ** Parameters: 293 ** ctx -- TLS context 294 ** ssl -- TLS structure 295 ** vrfy -- require certificate? 296 ** 297 ** Returns: 298 ** none. 299 ** 300 ** Side Effects: 301 ** Sets verification state for TLS 302 ** 303 # if TLS_VRFY_PER_CTX 304 ** Notice: 305 ** This is per TLS context, not per TLS structure; 306 ** the former is global, the latter per connection. 307 ** It would be nice to do this per connection, but this 308 ** doesn't work in the current TLS libraries :-( 309 # endif * TLS_VRFY_PER_CTX * 310 */ 311 312 void 313 tls_set_verify(ctx, ssl, vrfy) 314 SSL_CTX *ctx; 315 SSL *ssl; 316 bool vrfy; 317 { 318 # if !TLS_VRFY_PER_CTX 319 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL); 320 # else /* !TLS_VRFY_PER_CTX */ 321 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, 322 NULL); 323 # endif /* !TLS_VRFY_PER_CTX */ 324 } 325 326 /* 327 ** status in initialization 328 ** these flags keep track of the status of the initialization 329 ** i.e., whether a file exists (_EX) and whether it can be used (_OK) 330 ** [due to permissions] 331 */ 332 333 # define TLS_S_NONE 0x00000000 /* none yet */ 334 # define TLS_S_CERT_EX 0x00000001 /* cert file exists */ 335 # define TLS_S_CERT_OK 0x00000002 /* cert file is ok */ 336 # define TLS_S_KEY_EX 0x00000004 /* key file exists */ 337 # define TLS_S_KEY_OK 0x00000008 /* key file is ok */ 338 # define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */ 339 # define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */ 340 # define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */ 341 # define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */ 342 # define TLS_S_CRLF_EX 0x00000100 /* CRL file exists */ 343 # define TLS_S_CRLF_OK 0x00000200 /* CRL file is ok */ 344 345 # if _FFR_TLS_1 346 # define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */ 347 # define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */ 348 # define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */ 349 # define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */ 350 # endif /* _FFR_TLS_1 */ 351 352 # define TLS_S_DH_OK 0x00200000 /* DH cert is ok */ 353 # define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */ 354 # define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */ 355 356 /* Type of variable */ 357 # define TLS_T_OTHER 0 358 # define TLS_T_SRV 1 359 # define TLS_T_CLT 2 360 361 /* 362 ** TLS_OK_F -- can var be an absolute filename? 363 ** 364 ** Parameters: 365 ** var -- filename 366 ** fn -- what is the filename used for? 367 ** type -- type of variable 368 ** 369 ** Returns: 370 ** ok? 371 */ 372 373 static bool 374 tls_ok_f(var, fn, type) 375 char *var; 376 char *fn; 377 int type; 378 { 379 /* must be absolute pathname */ 380 if (var != NULL && *var == '/') 381 return true; 382 if (LogLevel > 12) 383 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing", 384 type == TLS_T_SRV ? "Server" : 385 (type == TLS_T_CLT ? "Client" : ""), fn); 386 return false; 387 } 388 /* 389 ** TLS_SAFE_F -- is a file safe to use? 390 ** 391 ** Parameters: 392 ** var -- filename 393 ** sff -- flags for safefile() 394 ** srv -- server side? 395 ** 396 ** Returns: 397 ** ok? 398 */ 399 400 static bool 401 tls_safe_f(var, sff, srv) 402 char *var; 403 long sff; 404 bool srv; 405 { 406 int ret; 407 408 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff, 409 S_IRUSR, NULL)) == 0) 410 return true; 411 if (LogLevel > 7) 412 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s", 413 srv ? "server" : "client", var, sm_errstring(ret)); 414 return false; 415 } 416 417 /* 418 ** TLS_OK_F -- macro to simplify calls to tls_ok_f 419 ** 420 ** Parameters: 421 ** var -- filename 422 ** fn -- what is the filename used for? 423 ** req -- is the file required? 424 ** st -- status bit to set if ok 425 ** type -- type of variable 426 ** 427 ** Side Effects: 428 ** uses r, ok; may change ok and status. 429 ** 430 */ 431 432 # define TLS_OK_F(var, fn, req, st, type) if (ok) \ 433 { \ 434 r = tls_ok_f(var, fn, type); \ 435 if (r) \ 436 status |= st; \ 437 else if (req) \ 438 ok = false; \ 439 } 440 441 /* 442 ** TLS_UNR -- macro to return whether a file should be unreadable 443 ** 444 ** Parameters: 445 ** bit -- flag to test 446 ** req -- flags 447 ** 448 ** Returns: 449 ** 0/SFF_NORFILES 450 */ 451 # define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0) 452 # define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0) 453 # define TLS_KEYSFF(req) \ 454 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \ 455 TLS_OUNR(TLS_I_KEY_OUNR, req) : \ 456 TLS_UNR(TLS_I_KEY_UNR, req)) 457 458 /* 459 ** TLS_SAFE_F -- macro to simplify calls to tls_safe_f 460 ** 461 ** Parameters: 462 ** var -- filename 463 ** sff -- flags for safefile() 464 ** req -- is the file required? 465 ** ex -- does the file exist? 466 ** st -- status bit to set if ok 467 ** srv -- server side? 468 ** 469 ** Side Effects: 470 ** uses r, ok, ex; may change ok and status. 471 ** 472 */ 473 474 # define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \ 475 { \ 476 r = tls_safe_f(var, sff, srv); \ 477 if (r) \ 478 status |= st; \ 479 else if (req) \ 480 ok = false; \ 481 } 482 483 /* 484 ** INITTLS -- initialize TLS 485 ** 486 ** Parameters: 487 ** ctx -- pointer to context 488 ** req -- requirements for initialization (see sendmail.h) 489 ** srv -- server side? 490 ** certfile -- filename of certificate 491 ** keyfile -- filename of private key 492 ** cacertpath -- path to CAs 493 ** cacertfile -- file with CA(s) 494 ** dhparam -- parameters for DH 495 ** 496 ** Returns: 497 ** succeeded? 498 */ 499 500 bool 501 inittls(ctx, req, srv, certfile, keyfile, cacertpath, cacertfile, dhparam) 502 SSL_CTX **ctx; 503 unsigned long req; 504 bool srv; 505 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam; 506 { 507 # if !NO_DH 508 static DH *dh = NULL; 509 # endif /* !NO_DH */ 510 int r; 511 bool ok; 512 long sff, status; 513 char *who; 514 # if _FFR_TLS_1 515 char *cf2, *kf2; 516 # endif /* _FFR_TLS_1 */ 517 # if SM_CONF_SHM 518 extern int ShmId; 519 # endif /* SM_CONF_SHM */ 520 # if OPENSSL_VERSION_NUMBER > 0x00907000L 521 BIO *crl_file; 522 X509_CRL *crl; 523 X509_STORE *store; 524 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 525 526 status = TLS_S_NONE; 527 who = srv ? "server" : "client"; 528 if (ctx == NULL) 529 syserr("STARTTLS=%s, inittls: ctx == NULL", who); 530 531 /* already initialized? (we could re-init...) */ 532 if (*ctx != NULL) 533 return true; 534 ok = true; 535 536 # if _FFR_TLS_1 537 /* 538 ** look for a second filename: it must be separated by a ',' 539 ** no blanks allowed (they won't be skipped). 540 ** we change a global variable here! this change will be undone 541 ** before return from the function but only if it returns true. 542 ** this isn't a problem since in a failure case this function 543 ** won't be called again with the same (overwritten) values. 544 ** otherwise each return must be replaced with a goto endinittls. 545 */ 546 547 cf2 = NULL; 548 kf2 = NULL; 549 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL) 550 { 551 *cf2++ = '\0'; 552 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL) 553 *kf2++ = '\0'; 554 } 555 # endif /* _FFR_TLS_1 */ 556 557 /* 558 ** Check whether files/paths are defined 559 */ 560 561 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 562 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT); 563 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 564 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT); 565 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req), 566 TLS_S_CERTP_EX, TLS_T_OTHER); 567 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req), 568 TLS_S_CERTF_EX, TLS_T_OTHER); 569 570 # if OPENSSL_VERSION_NUMBER > 0x00907000L 571 TLS_OK_F(CRLFile, "CRLFile", bitset(TLS_I_CRLF_EX, req), 572 TLS_S_CRLF_EX, TLS_T_OTHER); 573 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 574 575 # if _FFR_TLS_1 576 /* 577 ** if the second file is specified it must exist 578 ** XXX: it is possible here to define only one of those files 579 */ 580 581 if (cf2 != NULL) 582 { 583 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req), 584 TLS_S_CERT2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 585 } 586 if (kf2 != NULL) 587 { 588 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req), 589 TLS_S_KEY2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 590 } 591 # endif /* _FFR_TLS_1 */ 592 593 /* 594 ** valid values for dhparam are (only the first char is checked) 595 ** none no parameters: don't use DH 596 ** 512 generate 512 bit parameters (fixed) 597 ** 1024 generate 1024 bit parameters 598 ** /file/name read parameters from /file/name 599 ** default is: 1024 for server, 512 for client (OK? XXX) 600 */ 601 602 if (bitset(TLS_I_TRY_DH, req)) 603 { 604 if (dhparam != NULL) 605 { 606 char c = *dhparam; 607 608 if (c == '1') 609 req |= TLS_I_DH1024; 610 else if (c == '5') 611 req |= TLS_I_DH512; 612 else if (c != 'n' && c != 'N' && c != '/') 613 { 614 if (LogLevel > 12) 615 sm_syslog(LOG_WARNING, NOQID, 616 "STARTTLS=%s, error: illegal value '%s' for DHParam", 617 who, dhparam); 618 dhparam = NULL; 619 } 620 } 621 if (dhparam == NULL) 622 dhparam = srv ? "1" : "5"; 623 else if (*dhparam == '/') 624 { 625 TLS_OK_F(dhparam, "DHParameters", 626 bitset(TLS_I_DHPAR_EX, req), 627 TLS_S_DHPAR_EX, TLS_T_OTHER); 628 } 629 } 630 if (!ok) 631 return ok; 632 633 /* certfile etc. must be "safe". */ 634 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 635 | SFF_NOGWFILES | SFF_NOWWFILES 636 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 637 if (DontLockReadFiles) 638 sff |= SFF_NOLOCK; 639 640 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 641 bitset(TLS_I_CERT_EX, req), 642 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 643 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 644 bitset(TLS_I_KEY_EX, req), 645 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 646 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req), 647 bitset(TLS_I_CERTF_EX, req), 648 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv); 649 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req), 650 bitset(TLS_I_DHPAR_EX, req), 651 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv); 652 # if OPENSSL_VERSION_NUMBER > 0x00907000L 653 TLS_SAFE_F(CRLFile, sff | TLS_UNR(TLS_I_CRLF_UNR, req), 654 bitset(TLS_I_CRLF_EX, req), 655 bitset(TLS_S_CRLF_EX, status), TLS_S_CRLF_OK, srv); 656 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 657 if (!ok) 658 return ok; 659 # if _FFR_TLS_1 660 if (cf2 != NULL) 661 { 662 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req), 663 bitset(TLS_I_CERT_EX, req), 664 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv); 665 } 666 if (kf2 != NULL) 667 { 668 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req), 669 bitset(TLS_I_KEY_EX, req), 670 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv); 671 } 672 # endif /* _FFR_TLS_1 */ 673 674 /* create a method and a new context */ 675 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() : 676 SSLv23_client_method())) == NULL) 677 { 678 if (LogLevel > 7) 679 sm_syslog(LOG_WARNING, NOQID, 680 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed", 681 who, who); 682 if (LogLevel > 9) 683 tlslogerr(who); 684 return false; 685 } 686 687 # if OPENSSL_VERSION_NUMBER > 0x00907000L 688 if (CRLFile != NULL) 689 { 690 /* get a pointer to the current certificate validation store */ 691 store = SSL_CTX_get_cert_store(*ctx); /* does not fail */ 692 crl_file = BIO_new(BIO_s_file_internal()); 693 if (crl_file != NULL) 694 { 695 if (BIO_read_filename(crl_file, CRLFile) >= 0) 696 { 697 crl = PEM_read_bio_X509_CRL(crl_file, NULL, 698 NULL, NULL); 699 BIO_free(crl_file); 700 X509_STORE_add_crl(store, crl); 701 X509_CRL_free(crl); 702 X509_STORE_set_flags(store, 703 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 704 X509_STORE_set_verify_cb_func(store, 705 x509_verify_cb); 706 } 707 else 708 { 709 if (LogLevel > 9) 710 { 711 sm_syslog(LOG_WARNING, NOQID, 712 "STARTTLS=%s, error: PEM_read_bio_X509_CRL(%s)=failed", 713 who, CRLFile); 714 } 715 716 /* avoid memory leaks */ 717 BIO_free(crl_file); 718 return false; 719 } 720 721 } 722 else if (LogLevel > 9) 723 sm_syslog(LOG_WARNING, NOQID, 724 "STARTTLS=%s, error: BIO_new=failed", who); 725 } 726 # if _FFR_CRLPATH 727 if (CRLPath != NULL) 728 { 729 X509_LOOKUP *lookup; 730 731 lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir()); 732 if (lookup == NULL) 733 { 734 if (LogLevel > 9) 735 { 736 sm_syslog(LOG_WARNING, NOQID, 737 "STARTTLS=%s, error: X509_STORE_add_lookup(hash)=failed", 738 who, CRLFile); 739 } 740 return false; 741 } 742 X509_LOOKUP_add_dir(lookup, CRLPath, X509_FILETYPE_PEM); 743 X509_STORE_set_flags(store, 744 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 745 } 746 # endif /* _FFR_CRLPATH */ 747 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 748 749 # if TLS_NO_RSA 750 /* turn off backward compatibility, required for no-rsa */ 751 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2); 752 # endif /* TLS_NO_RSA */ 753 754 755 # if !TLS_NO_RSA 756 /* 757 ** Create a temporary RSA key 758 ** XXX Maybe we shouldn't create this always (even though it 759 ** is only at startup). 760 ** It is a time-consuming operation and it is not always necessary. 761 ** maybe we should do it only on demand... 762 */ 763 764 if (bitset(TLS_I_RSA_TMP, req) 765 # if SM_CONF_SHM 766 && ShmId != SM_SHM_NO_ID && 767 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, 768 NULL)) == NULL 769 # else /* SM_CONF_SHM */ 770 && 0 /* no shared memory: no need to generate key now */ 771 # endif /* SM_CONF_SHM */ 772 ) 773 { 774 if (LogLevel > 7) 775 { 776 sm_syslog(LOG_WARNING, NOQID, 777 "STARTTLS=%s, error: RSA_generate_key failed", 778 who); 779 if (LogLevel > 9) 780 tlslogerr(who); 781 } 782 return false; 783 } 784 # endif /* !TLS_NO_RSA */ 785 786 /* 787 ** load private key 788 ** XXX change this for DSA-only version 789 */ 790 791 if (bitset(TLS_S_KEY_OK, status) && 792 SSL_CTX_use_PrivateKey_file(*ctx, keyfile, 793 SSL_FILETYPE_PEM) <= 0) 794 { 795 if (LogLevel > 7) 796 { 797 sm_syslog(LOG_WARNING, NOQID, 798 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 799 who, keyfile); 800 if (LogLevel > 9) 801 tlslogerr(who); 802 } 803 if (bitset(TLS_I_USE_KEY, req)) 804 return false; 805 } 806 807 /* get the certificate file */ 808 if (bitset(TLS_S_CERT_OK, status) && 809 SSL_CTX_use_certificate_file(*ctx, certfile, 810 SSL_FILETYPE_PEM) <= 0) 811 { 812 if (LogLevel > 7) 813 { 814 sm_syslog(LOG_WARNING, NOQID, 815 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 816 who, certfile); 817 if (LogLevel > 9) 818 tlslogerr(who); 819 } 820 if (bitset(TLS_I_USE_CERT, req)) 821 return false; 822 } 823 824 /* check the private key */ 825 if (bitset(TLS_S_KEY_OK, status) && 826 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 827 { 828 /* Private key does not match the certificate public key */ 829 if (LogLevel > 5) 830 { 831 sm_syslog(LOG_WARNING, NOQID, 832 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d", 833 who, keyfile, r); 834 if (LogLevel > 9) 835 tlslogerr(who); 836 } 837 if (bitset(TLS_I_USE_KEY, req)) 838 return false; 839 } 840 841 # if _FFR_TLS_1 842 /* XXX this code is pretty much duplicated from above! */ 843 844 /* load private key */ 845 if (bitset(TLS_S_KEY2_OK, status) && 846 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0) 847 { 848 if (LogLevel > 7) 849 { 850 sm_syslog(LOG_WARNING, NOQID, 851 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 852 who, kf2); 853 if (LogLevel > 9) 854 tlslogerr(who); 855 } 856 } 857 858 /* get the certificate file */ 859 if (bitset(TLS_S_CERT2_OK, status) && 860 SSL_CTX_use_certificate_file(*ctx, cf2, SSL_FILETYPE_PEM) <= 0) 861 { 862 if (LogLevel > 7) 863 { 864 sm_syslog(LOG_WARNING, NOQID, 865 "STARTTLS=%s, error: SSL_CTX_use_certificate_file(%s) failed", 866 who, cf2); 867 if (LogLevel > 9) 868 tlslogerr(who); 869 } 870 } 871 872 /* also check the private key */ 873 if (bitset(TLS_S_KEY2_OK, status) && 874 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 875 { 876 /* Private key does not match the certificate public key */ 877 if (LogLevel > 5) 878 { 879 sm_syslog(LOG_WARNING, NOQID, 880 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d", 881 who, r); 882 if (LogLevel > 9) 883 tlslogerr(who); 884 } 885 } 886 # endif /* _FFR_TLS_1 */ 887 888 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */ 889 SSL_CTX_set_options(*ctx, SSL_OP_ALL); /* XXX bug compatibility? */ 890 891 # if !NO_DH 892 /* Diffie-Hellman initialization */ 893 if (bitset(TLS_I_TRY_DH, req)) 894 { 895 if (bitset(TLS_S_DHPAR_OK, status)) 896 { 897 BIO *bio; 898 899 if ((bio = BIO_new_file(dhparam, "r")) != NULL) 900 { 901 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 902 BIO_free(bio); 903 if (dh == NULL && LogLevel > 7) 904 { 905 unsigned long err; 906 907 err = ERR_get_error(); 908 sm_syslog(LOG_WARNING, NOQID, 909 "STARTTLS=%s, error: cannot read DH parameters(%s): %s", 910 who, dhparam, 911 ERR_error_string(err, NULL)); 912 if (LogLevel > 9) 913 tlslogerr(who); 914 } 915 } 916 else 917 { 918 if (LogLevel > 5) 919 { 920 sm_syslog(LOG_WARNING, NOQID, 921 "STARTTLS=%s, error: BIO_new_file(%s) failed", 922 who, dhparam); 923 if (LogLevel > 9) 924 tlslogerr(who); 925 } 926 } 927 } 928 if (dh == NULL && bitset(TLS_I_DH1024, req)) 929 { 930 DSA *dsa; 931 932 /* this takes a while! (7-130s on a 450MHz AMD K6-2) */ 933 dsa = DSA_generate_parameters(1024, NULL, 0, NULL, 934 NULL, 0, NULL); 935 dh = DSA_dup_DH(dsa); 936 DSA_free(dsa); 937 } 938 else 939 if (dh == NULL && bitset(TLS_I_DH512, req)) 940 dh = get_dh512(); 941 942 if (dh == NULL) 943 { 944 if (LogLevel > 9) 945 { 946 unsigned long err; 947 948 err = ERR_get_error(); 949 sm_syslog(LOG_WARNING, NOQID, 950 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s", 951 who, dhparam, 952 ERR_error_string(err, NULL)); 953 } 954 if (bitset(TLS_I_REQ_DH, req)) 955 return false; 956 } 957 else 958 { 959 SSL_CTX_set_tmp_dh(*ctx, dh); 960 961 /* important to avoid small subgroup attacks */ 962 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE); 963 if (LogLevel > 13) 964 sm_syslog(LOG_INFO, NOQID, 965 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)", 966 who, 8 * DH_size(dh), *dhparam); 967 DH_free(dh); 968 } 969 } 970 # endif /* !NO_DH */ 971 972 973 /* XXX do we need this cache here? */ 974 if (bitset(TLS_I_CACHE, req)) 975 SSL_CTX_sess_set_cache_size(*ctx, 128); 976 /* timeout? SSL_CTX_set_timeout(*ctx, TimeOut...); */ 977 978 /* load certificate locations and default CA paths */ 979 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status)) 980 { 981 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile, 982 cacertpath)) == 1) 983 { 984 # if !TLS_NO_RSA 985 if (bitset(TLS_I_RSA_TMP, req)) 986 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key); 987 # endif /* !TLS_NO_RSA */ 988 989 /* 990 ** We have to install our own verify callback: 991 ** SSL_VERIFY_PEER requests a client cert but even 992 ** though *FAIL_IF* isn't set, the connection 993 ** will be aborted if the client presents a cert 994 ** that is not "liked" (can't be verified?) by 995 ** the TLS library :-( 996 */ 997 998 /* 999 ** XXX currently we could call tls_set_verify() 1000 ** but we hope that that function will later on 1001 ** only set the mode per connection. 1002 */ 1003 SSL_CTX_set_verify(*ctx, 1004 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE 1005 : SSL_VERIFY_PEER, 1006 NULL); 1007 1008 /* install verify callback */ 1009 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb, 1010 NULL); 1011 SSL_CTX_set_client_CA_list(*ctx, 1012 SSL_load_client_CA_file(cacertfile)); 1013 } 1014 else 1015 { 1016 /* 1017 ** can't load CA data; do we care? 1018 ** the data is necessary to authenticate the client, 1019 ** which in turn would be necessary 1020 ** if we want to allow relaying based on it. 1021 */ 1022 if (LogLevel > 5) 1023 { 1024 sm_syslog(LOG_WARNING, NOQID, 1025 "STARTTLS=%s, error: load verify locs %s, %s failed: %d", 1026 who, cacertpath, cacertfile, r); 1027 if (LogLevel > 9) 1028 tlslogerr(who); 1029 } 1030 if (bitset(TLS_I_VRFY_LOC, req)) 1031 return false; 1032 } 1033 } 1034 1035 /* XXX: make this dependent on an option? */ 1036 if (tTd(96, 9)) 1037 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb); 1038 1039 # if _FFR_TLS_1 1040 /* install our own cipher list */ 1041 if (CipherList != NULL && *CipherList != '\0') 1042 { 1043 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0) 1044 { 1045 if (LogLevel > 7) 1046 { 1047 sm_syslog(LOG_WARNING, NOQID, 1048 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored", 1049 who, CipherList); 1050 1051 if (LogLevel > 9) 1052 tlslogerr(who); 1053 } 1054 /* failure if setting to this list is required? */ 1055 } 1056 } 1057 # endif /* _FFR_TLS_1 */ 1058 if (LogLevel > 12) 1059 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok); 1060 1061 # if _FFR_TLS_1 1062 # if 0 1063 /* 1064 ** this label is required if we want to have a "clean" exit 1065 ** see the comments above at the initialization of cf2 1066 */ 1067 1068 endinittls: 1069 # endif /* 0 */ 1070 1071 /* undo damage to global variables */ 1072 if (cf2 != NULL) 1073 *--cf2 = ','; 1074 if (kf2 != NULL) 1075 *--kf2 = ','; 1076 # endif /* _FFR_TLS_1 */ 1077 1078 return ok; 1079 } 1080 /* 1081 ** TLS_GET_INFO -- get information about TLS connection 1082 ** 1083 ** Parameters: 1084 ** ssl -- TLS connection structure 1085 ** srv -- server or client 1086 ** host -- hostname of other side 1087 ** mac -- macro storage 1088 ** certreq -- did we ask for a cert? 1089 ** 1090 ** Returns: 1091 ** result of authentication. 1092 ** 1093 ** Side Effects: 1094 ** sets macros: {cipher}, {tls_version}, {verify}, 1095 ** {cipher_bits}, {alg_bits}, {cert}, {cert_subject}, 1096 ** {cert_issuer}, {cn_subject}, {cn_issuer} 1097 */ 1098 1099 int 1100 tls_get_info(ssl, srv, host, mac, certreq) 1101 SSL *ssl; 1102 bool srv; 1103 char *host; 1104 MACROS_T *mac; 1105 bool certreq; 1106 { 1107 SSL_CIPHER *c; 1108 int b, r; 1109 long verifyok; 1110 char *s, *who; 1111 char bitstr[16]; 1112 X509 *cert; 1113 1114 c = SSL_get_current_cipher(ssl); 1115 1116 /* cast is just workaround for compiler warning */ 1117 macdefine(mac, A_TEMP, macid("{cipher}"), 1118 (char *) SSL_CIPHER_get_name(c)); 1119 b = SSL_CIPHER_get_bits(c, &r); 1120 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", b); 1121 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr); 1122 (void) sm_snprintf(bitstr, sizeof bitstr, "%d", r); 1123 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr); 1124 s = SSL_CIPHER_get_version(c); 1125 if (s == NULL) 1126 s = "UNKNOWN"; 1127 macdefine(mac, A_TEMP, macid("{tls_version}"), s); 1128 1129 who = srv ? "server" : "client"; 1130 cert = SSL_get_peer_certificate(ssl); 1131 verifyok = SSL_get_verify_result(ssl); 1132 if (LogLevel > 14) 1133 sm_syslog(LOG_INFO, NOQID, 1134 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx", 1135 who, verifyok, (unsigned long) cert); 1136 if (cert != NULL) 1137 { 1138 unsigned int n; 1139 unsigned char md[EVP_MAX_MD_SIZE]; 1140 char buf[MAXNAME]; 1141 1142 X509_NAME_oneline(X509_get_subject_name(cert), 1143 buf, sizeof buf); 1144 macdefine(mac, A_TEMP, macid("{cert_subject}"), 1145 xtextify(buf, "<>\")")); 1146 X509_NAME_oneline(X509_get_issuer_name(cert), 1147 buf, sizeof buf); 1148 macdefine(mac, A_TEMP, macid("{cert_issuer}"), 1149 xtextify(buf, "<>\")")); 1150 X509_NAME_get_text_by_NID(X509_get_subject_name(cert), 1151 NID_commonName, buf, sizeof buf); 1152 macdefine(mac, A_TEMP, macid("{cn_subject}"), 1153 xtextify(buf, "<>\")")); 1154 X509_NAME_get_text_by_NID(X509_get_issuer_name(cert), 1155 NID_commonName, buf, sizeof buf); 1156 macdefine(mac, A_TEMP, macid("{cn_issuer}"), 1157 xtextify(buf, "<>\")")); 1158 if (X509_digest(cert, EVP_md5(), md, &n)) 1159 { 1160 char md5h[EVP_MAX_MD_SIZE * 3]; 1161 static const char hexcodes[] = "0123456789ABCDEF"; 1162 1163 SM_ASSERT((n * 3) + 2 < sizeof(md5h)); 1164 for (r = 0; r < (int) n; r++) 1165 { 1166 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4]; 1167 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)]; 1168 md5h[(r * 3) + 2] = ':'; 1169 } 1170 md5h[(n * 3) - 1] = '\0'; 1171 macdefine(mac, A_TEMP, macid("{cert_md5}"), md5h); 1172 } 1173 else 1174 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1175 } 1176 else 1177 { 1178 macdefine(mac, A_PERM, macid("{cert_subject}"), ""); 1179 macdefine(mac, A_PERM, macid("{cert_issuer}"), ""); 1180 macdefine(mac, A_PERM, macid("{cn_subject}"), ""); 1181 macdefine(mac, A_PERM, macid("{cn_issuer}"), ""); 1182 macdefine(mac, A_TEMP, macid("{cert_md5}"), ""); 1183 } 1184 switch (verifyok) 1185 { 1186 case X509_V_OK: 1187 if (cert != NULL) 1188 { 1189 s = "OK"; 1190 r = TLS_AUTH_OK; 1191 } 1192 else 1193 { 1194 s = certreq ? "NO" : "NOT", 1195 r = TLS_AUTH_NO; 1196 } 1197 break; 1198 default: 1199 s = "FAIL"; 1200 r = TLS_AUTH_FAIL; 1201 break; 1202 } 1203 macdefine(mac, A_PERM, macid("{verify}"), s); 1204 if (cert != NULL) 1205 X509_free(cert); 1206 1207 /* do some logging */ 1208 if (LogLevel > 8) 1209 { 1210 char *vers, *s1, *s2, *cbits, *algbits; 1211 1212 vers = macget(mac, macid("{tls_version}")); 1213 cbits = macget(mac, macid("{cipher_bits}")); 1214 algbits = macget(mac, macid("{alg_bits}")); 1215 s1 = macget(mac, macid("{verify}")); 1216 s2 = macget(mac, macid("{cipher}")); 1217 1218 /* XXX: maybe cut off ident info? */ 1219 sm_syslog(LOG_INFO, NOQID, 1220 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s", 1221 who, 1222 host == NULL ? "local" : host, 1223 vers, s1, s2, /* sm_snprintf() can deal with NULL */ 1224 algbits == NULL ? "0" : algbits, 1225 cbits == NULL ? "0" : cbits); 1226 if (LogLevel > 11) 1227 { 1228 /* 1229 ** Maybe run xuntextify on the strings? 1230 ** That is easier to read but makes it maybe a bit 1231 ** more complicated to figure out the right values 1232 ** for the access map... 1233 */ 1234 1235 s1 = macget(mac, macid("{cert_subject}")); 1236 s2 = macget(mac, macid("{cert_issuer}")); 1237 sm_syslog(LOG_INFO, NOQID, 1238 "STARTTLS=%s, cert-subject=%.256s, cert-issuer=%.256s, verifymsg=%s", 1239 who, s1, s2, 1240 X509_verify_cert_error_string(verifyok)); 1241 } 1242 } 1243 return r; 1244 } 1245 /* 1246 ** ENDTLS -- shutdown secure connection 1247 ** 1248 ** Parameters: 1249 ** ssl -- SSL connection information. 1250 ** side -- server/client (for logging). 1251 ** 1252 ** Returns: 1253 ** success? (EX_* code) 1254 */ 1255 1256 int 1257 endtls(ssl, side) 1258 SSL *ssl; 1259 char *side; 1260 { 1261 int ret = EX_OK; 1262 1263 if (ssl != NULL) 1264 { 1265 int r; 1266 1267 if ((r = SSL_shutdown(ssl)) < 0) 1268 { 1269 if (LogLevel > 11) 1270 { 1271 sm_syslog(LOG_WARNING, NOQID, 1272 "STARTTLS=%s, SSL_shutdown failed: %d", 1273 side, r); 1274 tlslogerr(side); 1275 } 1276 ret = EX_SOFTWARE; 1277 } 1278 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL 1279 1280 /* 1281 ** Bug in OpenSSL (at least up to 0.9.6b): 1282 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE 1283 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de> 1284 ** To: openssl-users@openssl.org 1285 ** Subject: Re: SSL_shutdown() woes (fwd) 1286 ** 1287 ** The side sending the shutdown alert first will 1288 ** not care about the answer of the peer but will 1289 ** immediately return with a return value of "0" 1290 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate 1291 ** the value of "0" and as the shutdown alert of the peer was 1292 ** not received (actually, the program did not even wait for 1293 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this 1294 ** is the default rule in case everything else does not apply. 1295 ** 1296 ** For your server the problem is different, because it 1297 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN), 1298 ** then sends its response (SSL_SENT_SHUTDOWN), so for the 1299 ** server the shutdown was successfull. 1300 ** 1301 ** As is by know, you would have to call SSL_shutdown() once 1302 ** and ignore an SSL_ERROR_SYSCALL returned. Then call 1303 ** SSL_shutdown() again to actually get the server's response. 1304 ** 1305 ** In the last discussion, Bodo Moeller concluded that a 1306 ** rewrite of the shutdown code would be necessary, but 1307 ** probably with another API, as the change would not be 1308 ** compatible to the way it is now. Things do not become 1309 ** easier as other programs do not follow the shutdown 1310 ** guidelines anyway, so that a lot error conditions and 1311 ** compitibility issues would have to be caught. 1312 ** 1313 ** For now the recommondation is to ignore the error message. 1314 */ 1315 1316 else if (r == 0) 1317 { 1318 if (LogLevel > 15) 1319 { 1320 sm_syslog(LOG_WARNING, NOQID, 1321 "STARTTLS=%s, SSL_shutdown not done", 1322 side); 1323 tlslogerr(side); 1324 } 1325 ret = EX_SOFTWARE; 1326 } 1327 # endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */ 1328 SSL_free(ssl); 1329 ssl = NULL; 1330 } 1331 return ret; 1332 } 1333 1334 # if !TLS_NO_RSA 1335 /* 1336 ** TMP_RSA_KEY -- return temporary RSA key 1337 ** 1338 ** Parameters: 1339 ** s -- TLS connection structure 1340 ** export -- 1341 ** keylength -- 1342 ** 1343 ** Returns: 1344 ** temporary RSA key. 1345 */ 1346 1347 # ifndef MAX_RSA_TMP_CNT 1348 # define MAX_RSA_TMP_CNT 1000 /* XXX better value? */ 1349 # endif /* ! MAX_RSA_TMP_CNT */ 1350 1351 /* ARGUSED0 */ 1352 static RSA * 1353 tmp_rsa_key(s, export, keylength) 1354 SSL *s; 1355 int export; 1356 int keylength; 1357 { 1358 # if SM_CONF_SHM 1359 extern int ShmId; 1360 extern int *PRSATmpCnt; 1361 1362 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL && 1363 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT) 1364 return rsa_tmp; 1365 # endif /* SM_CONF_SHM */ 1366 1367 if (rsa_tmp != NULL) 1368 RSA_free(rsa_tmp); 1369 rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, NULL); 1370 if (rsa_tmp == NULL) 1371 { 1372 if (LogLevel > 0) 1373 sm_syslog(LOG_ERR, NOQID, 1374 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!"); 1375 } 1376 else 1377 { 1378 # if SM_CONF_SHM 1379 # if 0 1380 /* 1381 ** XXX we can't (yet) share the new key... 1382 ** The RSA structure contains pointers hence it can't be 1383 ** easily kept in shared memory. It must be transformed 1384 ** into a continous memory region first, then stored, 1385 ** and later read out again (each time re-transformed). 1386 */ 1387 1388 if (ShmId != SM_SHM_NO_ID) 1389 *PRSATmpCnt = 0; 1390 # endif /* 0 */ 1391 # endif /* SM_CONF_SHM */ 1392 if (LogLevel > 9) 1393 sm_syslog(LOG_ERR, NOQID, 1394 "STARTTLS=server, tmp_rsa_key: new temp RSA key"); 1395 } 1396 return rsa_tmp; 1397 } 1398 # endif /* !TLS_NO_RSA */ 1399 /* 1400 ** APPS_SSL_INFO_CB -- info callback for TLS connections 1401 ** 1402 ** Parameters: 1403 ** s -- TLS connection structure 1404 ** where -- state in handshake 1405 ** ret -- return code of last operation 1406 ** 1407 ** Returns: 1408 ** none. 1409 */ 1410 1411 static void 1412 apps_ssl_info_cb(s, where, ret) 1413 CONST097 SSL *s; 1414 int where; 1415 int ret; 1416 { 1417 int w; 1418 char *str; 1419 BIO *bio_err = NULL; 1420 1421 if (LogLevel > 14) 1422 sm_syslog(LOG_INFO, NOQID, 1423 "STARTTLS: info_callback where=0x%x, ret=%d", 1424 where, ret); 1425 1426 w = where & ~SSL_ST_MASK; 1427 if (bio_err == NULL) 1428 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); 1429 1430 if (bitset(SSL_ST_CONNECT, w)) 1431 str = "SSL_connect"; 1432 else if (bitset(SSL_ST_ACCEPT, w)) 1433 str = "SSL_accept"; 1434 else 1435 str = "undefined"; 1436 1437 if (bitset(SSL_CB_LOOP, where)) 1438 { 1439 if (LogLevel > 12) 1440 sm_syslog(LOG_NOTICE, NOQID, 1441 "STARTTLS: %s:%s", 1442 str, SSL_state_string_long(s)); 1443 } 1444 else if (bitset(SSL_CB_ALERT, where)) 1445 { 1446 str = bitset(SSL_CB_READ, where) ? "read" : "write"; 1447 if (LogLevel > 12) 1448 sm_syslog(LOG_NOTICE, NOQID, 1449 "STARTTLS: SSL3 alert %s:%s:%s", 1450 str, SSL_alert_type_string_long(ret), 1451 SSL_alert_desc_string_long(ret)); 1452 } 1453 else if (bitset(SSL_CB_EXIT, where)) 1454 { 1455 if (ret == 0) 1456 { 1457 if (LogLevel > 7) 1458 sm_syslog(LOG_WARNING, NOQID, 1459 "STARTTLS: %s:failed in %s", 1460 str, SSL_state_string_long(s)); 1461 } 1462 else if (ret < 0) 1463 { 1464 if (LogLevel > 7) 1465 sm_syslog(LOG_WARNING, NOQID, 1466 "STARTTLS: %s:error in %s", 1467 str, SSL_state_string_long(s)); 1468 } 1469 } 1470 } 1471 /* 1472 ** TLS_VERIFY_LOG -- log verify error for TLS certificates 1473 ** 1474 ** Parameters: 1475 ** ok -- verify ok? 1476 ** ctx -- x509 context 1477 ** 1478 ** Returns: 1479 ** 0 -- fatal error 1480 ** 1 -- ok 1481 */ 1482 1483 static int 1484 tls_verify_log(ok, ctx, name) 1485 int ok; 1486 X509_STORE_CTX *ctx; 1487 char *name; 1488 { 1489 SSL *ssl; 1490 X509 *cert; 1491 int reason, depth; 1492 char buf[512]; 1493 1494 cert = X509_STORE_CTX_get_current_cert(ctx); 1495 reason = X509_STORE_CTX_get_error(ctx); 1496 depth = X509_STORE_CTX_get_error_depth(ctx); 1497 ssl = (SSL *) X509_STORE_CTX_get_ex_data(ctx, 1498 SSL_get_ex_data_X509_STORE_CTX_idx()); 1499 1500 if (ssl == NULL) 1501 { 1502 /* internal error */ 1503 sm_syslog(LOG_ERR, NOQID, 1504 "STARTTLS: internal error: tls_verify_cb: ssl == NULL"); 1505 return 0; 1506 } 1507 1508 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof buf); 1509 sm_syslog(LOG_INFO, NOQID, 1510 "STARTTLS: %s cert verify: depth=%d %s, state=%d, reason=%s", 1511 name, depth, buf, ok, X509_verify_cert_error_string(reason)); 1512 return 1; 1513 } 1514 1515 /* 1516 ** TLS_VERIFY_CB -- verify callback for TLS certificates 1517 ** 1518 ** Parameters: 1519 ** ctx -- x509 context 1520 ** 1521 ** Returns: 1522 ** accept connection? 1523 ** currently: always yes. 1524 */ 1525 1526 static int 1527 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 1528 tls_verify_cb(ctx) 1529 X509_STORE_CTX *ctx; 1530 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1531 tls_verify_cb(ctx, unused) 1532 X509_STORE_CTX *ctx; 1533 void *unused; 1534 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1535 { 1536 int ok; 1537 1538 ok = X509_verify_cert(ctx); 1539 if (ok == 0) 1540 { 1541 if (LogLevel > 13) 1542 return tls_verify_log(ok, ctx, "TLS"); 1543 return 1; /* override it */ 1544 } 1545 return ok; 1546 } 1547 /* 1548 ** TLSLOGERR -- log the errors from the TLS error stack 1549 ** 1550 ** Parameters: 1551 ** who -- server/client (for logging). 1552 ** 1553 ** Returns: 1554 ** none. 1555 */ 1556 1557 void 1558 tlslogerr(who) 1559 char *who; 1560 { 1561 unsigned long l; 1562 int line, flags; 1563 unsigned long es; 1564 char *file, *data; 1565 char buf[256]; 1566 # define CP (const char **) 1567 1568 es = CRYPTO_thread_id(); 1569 while ((l = ERR_get_error_line_data(CP &file, &line, CP &data, &flags)) 1570 != 0) 1571 { 1572 sm_syslog(LOG_WARNING, NOQID, 1573 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es, 1574 ERR_error_string(l, buf), 1575 file, line, 1576 bitset(ERR_TXT_STRING, flags) ? data : ""); 1577 } 1578 } 1579 1580 # if OPENSSL_VERSION_NUMBER > 0x00907000L 1581 /* 1582 ** X509_VERIFY_CB -- verify callback 1583 ** 1584 ** Parameters: 1585 ** ctx -- x509 context 1586 ** 1587 ** Returns: 1588 ** accept connection? 1589 ** currently: always yes. 1590 */ 1591 1592 static int 1593 x509_verify_cb(ok, ctx) 1594 int ok; 1595 X509_STORE_CTX *ctx; 1596 { 1597 if (ok == 0) 1598 { 1599 if (LogLevel > 13) 1600 tls_verify_log(ok, ctx, "x509"); 1601 if (ctx->error == X509_V_ERR_UNABLE_TO_GET_CRL) 1602 { 1603 ctx->error = 0; 1604 return 1; /* override it */ 1605 } 1606 } 1607 return ok; 1608 } 1609 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 1610 #endif /* STARTTLS */ 1611