1 /* 2 * Copyright (c) 2000-2006, 2008, 2009, 2011, 2013 Proofpoint, 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 8.127 2013-11-27 02:51:11 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 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 *, const 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 #if OPENSSL_VERSION_NUMBER < 0x10100000 64 65 static inline int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g) 66 { 67 /* If the fields p and g in d are NULL, the corresponding input 68 * parameters MUST be non-NULL. q may remain NULL. 69 */ 70 if ((dh->p == NULL && p == NULL) 71 || (dh->g == NULL && g == NULL)) 72 return 0; 73 74 if (p != NULL) { 75 BN_free(dh->p); 76 dh->p = p; 77 } 78 if (q != NULL) { 79 BN_free(dh->q); 80 dh->q = q; 81 } 82 if (g != NULL) { 83 BN_free(dh->g); 84 dh->g = g; 85 } 86 87 if (q != NULL) { 88 dh->length = BN_num_bits(q); 89 } 90 91 return 1; 92 } 93 #endif 94 95 static DH * 96 get_dh512() 97 { 98 DH *dh = NULL; 99 BIGNUM *p; 100 BIGNUM *g; 101 102 dh = DH_new(); 103 p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL); 104 g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL); 105 if (!dh || !p || !g) 106 goto err; 107 if (!DH_set0_pqg(dh, p, NULL, g)) 108 goto err; 109 return dh; 110 err: 111 DH_free(dh); 112 BN_free(p); 113 BN_free(g); 114 return NULL; 115 } 116 117 # if 0 118 119 This is the data from which the C code has been generated: 120 121 -----BEGIN DH PARAMETERS----- 122 MIIBCAKCAQEArDcgcLpxEksQHPlolRKCUJ2szKRziseWV9cUSQNZGxoGw7KkROz4 123 HF9QSbg5axyNIG+QbZYtx0jp3l6/GWq1dLOj27yZkgYgaYgFrvKPiZ2jJ5xETQVH 124 UpZwbjRcyjyWkWYJVsx1aF4F/iY4kT0n/+iGEoimI3C9V3KXTJ2S6jIkyJ6M/CrN 125 EtrDynMlUMGlc7S1ouXVOTrtKeqy3S2L9eBLxVI+sChEijGIfELupdVeXihK006p 126 MgnABPDbkTx6OOtYmSZaGQX+OLW2FPmwvcrzgCz9t9cAsuUcBZv1LeHEqZZttyLU 127 oK0jjSXgFyeU4/NfyA+zuNeWzUL6bHmigwIBAg== 128 -----END DH PARAMETERS----- 129 # endif /* 0 */ 130 131 static DH * 132 get_dh2048() 133 { 134 static unsigned char dh2048_p[]={ 135 0xAC,0x37,0x20,0x70,0xBA,0x71,0x12,0x4B,0x10,0x1C,0xF9,0x68, 136 0x95,0x12,0x82,0x50,0x9D,0xAC,0xCC,0xA4,0x73,0x8A,0xC7,0x96, 137 0x57,0xD7,0x14,0x49,0x03,0x59,0x1B,0x1A,0x06,0xC3,0xB2,0xA4, 138 0x44,0xEC,0xF8,0x1C,0x5F,0x50,0x49,0xB8,0x39,0x6B,0x1C,0x8D, 139 0x20,0x6F,0x90,0x6D,0x96,0x2D,0xC7,0x48,0xE9,0xDE,0x5E,0xBF, 140 0x19,0x6A,0xB5,0x74,0xB3,0xA3,0xDB,0xBC,0x99,0x92,0x06,0x20, 141 0x69,0x88,0x05,0xAE,0xF2,0x8F,0x89,0x9D,0xA3,0x27,0x9C,0x44, 142 0x4D,0x05,0x47,0x52,0x96,0x70,0x6E,0x34,0x5C,0xCA,0x3C,0x96, 143 0x91,0x66,0x09,0x56,0xCC,0x75,0x68,0x5E,0x05,0xFE,0x26,0x38, 144 0x91,0x3D,0x27,0xFF,0xE8,0x86,0x12,0x88,0xA6,0x23,0x70,0xBD, 145 0x57,0x72,0x97,0x4C,0x9D,0x92,0xEA,0x32,0x24,0xC8,0x9E,0x8C, 146 0xFC,0x2A,0xCD,0x12,0xDA,0xC3,0xCA,0x73,0x25,0x50,0xC1,0xA5, 147 0x73,0xB4,0xB5,0xA2,0xE5,0xD5,0x39,0x3A,0xED,0x29,0xEA,0xB2, 148 0xDD,0x2D,0x8B,0xF5,0xE0,0x4B,0xC5,0x52,0x3E,0xB0,0x28,0x44, 149 0x8A,0x31,0x88,0x7C,0x42,0xEE,0xA5,0xD5,0x5E,0x5E,0x28,0x4A, 150 0xD3,0x4E,0xA9,0x32,0x09,0xC0,0x04,0xF0,0xDB,0x91,0x3C,0x7A, 151 0x38,0xEB,0x58,0x99,0x26,0x5A,0x19,0x05,0xFE,0x38,0xB5,0xB6, 152 0x14,0xF9,0xB0,0xBD,0xCA,0xF3,0x80,0x2C,0xFD,0xB7,0xD7,0x00, 153 0xB2,0xE5,0x1C,0x05,0x9B,0xF5,0x2D,0xE1,0xC4,0xA9,0x96,0x6D, 154 0xB7,0x22,0xD4,0xA0,0xAD,0x23,0x8D,0x25,0xE0,0x17,0x27,0x94, 155 0xE3,0xF3,0x5F,0xC8,0x0F,0xB3,0xB8,0xD7,0x96,0xCD,0x42,0xFA, 156 0x6C,0x79,0xA2,0x83, 157 }; 158 static unsigned char dh2048_g[]={ 0x02, }; 159 DH *dh; 160 BIGNUM *p; 161 BIGNUM *g; 162 163 dh = DH_new(); 164 p = BN_bin2bn(dh2048_p,sizeof(dh2048_p),NULL); 165 g = BN_bin2bn(dh2048_g,sizeof(dh2048_g),NULL); 166 if (!dh || !p || !g) 167 goto err; 168 if (!DH_set0_pqg(dh, p, NULL, g)) 169 goto err; 170 return(dh); 171 err: 172 DH_free(dh); 173 BN_free(p); 174 BN_free(g); 175 return NULL; 176 } 177 # endif /* !NO_DH */ 178 179 180 /* 181 ** TLS_RAND_INIT -- initialize STARTTLS random generator 182 ** 183 ** Parameters: 184 ** randfile -- name of file with random data 185 ** logl -- loglevel 186 ** 187 ** Returns: 188 ** success/failure 189 ** 190 ** Side Effects: 191 ** initializes PRNG for tls library. 192 */ 193 194 # define MIN_RAND_BYTES 128 /* 1024 bits */ 195 196 # define RF_OK 0 /* randfile OK */ 197 # define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */ 198 # define RF_UNKNOWN 2 /* unknown prefix for randfile */ 199 200 # define RI_NONE 0 /* no init yet */ 201 # define RI_SUCCESS 1 /* init was successful */ 202 # define RI_FAIL 2 /* init failed */ 203 204 static bool tls_rand_init __P((char *, int)); 205 206 static bool 207 tls_rand_init(randfile, logl) 208 char *randfile; 209 int logl; 210 { 211 # ifndef HASURANDOMDEV 212 /* not required if /dev/urandom exists, OpenSSL does it internally */ 213 214 bool ok; 215 int randdef; 216 static int done = RI_NONE; 217 218 /* 219 ** initialize PRNG 220 */ 221 222 /* did we try this before? if yes: return old value */ 223 if (done != RI_NONE) 224 return done == RI_SUCCESS; 225 226 /* set default values */ 227 ok = false; 228 done = RI_FAIL; 229 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK; 230 # if EGD 231 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0) 232 { 233 randfile += 4; 234 if (RAND_egd(randfile) < 0) 235 { 236 sm_syslog(LOG_WARNING, NOQID, 237 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded", 238 randfile); 239 } 240 else 241 ok = true; 242 } 243 else 244 # endif /* EGD */ 245 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0) 246 { 247 int fd; 248 long sff; 249 struct stat st; 250 251 randfile += 5; 252 sff = SFF_SAFEDIRPATH | SFF_NOWLINK 253 | SFF_NOGWFILES | SFF_NOWWFILES 254 | SFF_NOGRFILES | SFF_NOWRFILES 255 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 256 if (DontLockReadFiles) 257 sff |= SFF_NOLOCK; 258 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0) 259 { 260 if (fstat(fd, &st) < 0) 261 { 262 if (LogLevel > logl) 263 sm_syslog(LOG_ERR, NOQID, 264 "STARTTLS: can't fstat(%s)", 265 randfile); 266 } 267 else 268 { 269 bool use, problem; 270 271 use = true; 272 problem = false; 273 274 /* max. age of file: 10 minutes */ 275 if (st.st_mtime + 600 < curtime()) 276 { 277 use = bitnset(DBS_INSUFFICIENTENTROPY, 278 DontBlameSendmail); 279 problem = true; 280 if (LogLevel > logl) 281 sm_syslog(LOG_ERR, NOQID, 282 "STARTTLS: RandFile %s too old: %s", 283 randfile, 284 use ? "unsafe" : 285 "unusable"); 286 } 287 if (use && st.st_size < MIN_RAND_BYTES) 288 { 289 use = bitnset(DBS_INSUFFICIENTENTROPY, 290 DontBlameSendmail); 291 problem = true; 292 if (LogLevel > logl) 293 sm_syslog(LOG_ERR, NOQID, 294 "STARTTLS: size(%s) < %d: %s", 295 randfile, 296 MIN_RAND_BYTES, 297 use ? "unsafe" : 298 "unusable"); 299 } 300 if (use) 301 ok = RAND_load_file(randfile, -1) >= 302 MIN_RAND_BYTES; 303 if (use && !ok) 304 { 305 if (LogLevel > logl) 306 sm_syslog(LOG_WARNING, NOQID, 307 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded", 308 randfile); 309 } 310 if (problem) 311 ok = false; 312 } 313 if (ok || bitnset(DBS_INSUFFICIENTENTROPY, 314 DontBlameSendmail)) 315 { 316 /* add this even if fstat() failed */ 317 RAND_seed((void *) &st, sizeof(st)); 318 } 319 (void) close(fd); 320 } 321 else 322 { 323 if (LogLevel > logl) 324 sm_syslog(LOG_WARNING, NOQID, 325 "STARTTLS: Warning: safeopen(%s) failed", 326 randfile); 327 } 328 } 329 else if (randdef == RF_OK) 330 { 331 if (LogLevel > logl) 332 sm_syslog(LOG_WARNING, NOQID, 333 "STARTTLS: Error: no proper random file definition %s", 334 randfile); 335 randdef = RF_UNKNOWN; 336 } 337 if (randdef == RF_MISS) 338 { 339 if (LogLevel > logl) 340 sm_syslog(LOG_WARNING, NOQID, 341 "STARTTLS: Error: missing random file definition"); 342 } 343 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail)) 344 { 345 int i; 346 long r; 347 unsigned char buf[MIN_RAND_BYTES]; 348 349 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */ 350 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long)) 351 { 352 r = get_random(); 353 (void) memcpy(buf + i, (void *) &r, sizeof(long)); 354 } 355 RAND_seed(buf, sizeof(buf)); 356 if (LogLevel > logl) 357 sm_syslog(LOG_WARNING, NOQID, 358 "STARTTLS: Warning: random number generator not properly seeded"); 359 ok = true; 360 } 361 done = ok ? RI_SUCCESS : RI_FAIL; 362 return ok; 363 # else /* ! HASURANDOMDEV */ 364 return true; 365 # endif /* ! HASURANDOMDEV */ 366 } 367 /* 368 ** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use. 369 ** 370 ** Parameters: 371 ** fipsmode -- use FIPS? 372 ** 373 ** Returns: 374 ** succeeded? 375 */ 376 377 bool 378 init_tls_library(fipsmode) 379 bool fipsmode; 380 { 381 bool bv; 382 383 /* basic TLS initialization, ignore result for now */ 384 SSL_library_init(); 385 SSL_load_error_strings(); 386 OpenSSL_add_all_algorithms(); 387 # if 0 388 /* this is currently a macro for SSL_library_init */ 389 SSLeay_add_ssl_algorithms(); 390 # endif /* 0 */ 391 392 bv = tls_rand_init(RandFile, 7); 393 # if _FFR_FIPSMODE 394 if (bv && fipsmode) 395 { 396 if (!FIPS_mode_set(1)) 397 { 398 unsigned long err; 399 400 err = ERR_get_error(); 401 if (LogLevel > 0) 402 sm_syslog(LOG_ERR, NOQID, 403 "STARTTLS=init, FIPSMode=%s", 404 ERR_error_string(err, NULL)); 405 return false; 406 } 407 else 408 { 409 if (LogLevel > 9) 410 sm_syslog(LOG_INFO, NOQID, 411 "STARTTLS=init, FIPSMode=ok"); 412 } 413 } 414 #endif /* _FFR_FIPSMODE */ 415 if (bv && CertFingerprintAlgorithm != NULL) 416 { 417 const EVP_MD *md; 418 419 md = EVP_get_digestbyname(CertFingerprintAlgorithm); 420 if (NULL == md) 421 { 422 bv = false; 423 if (LogLevel > 0) 424 sm_syslog(LOG_ERR, NOQID, 425 "STARTTLS=init, CertFingerprintAlgorithm=%s, status=invalid" 426 , CertFingerprintAlgorithm); 427 } 428 else 429 EVP_digest = md; 430 } 431 return bv; 432 } 433 434 /* 435 ** TLS_SET_VERIFY -- request client certificate? 436 ** 437 ** Parameters: 438 ** ctx -- TLS context 439 ** ssl -- TLS structure 440 ** vrfy -- request certificate? 441 ** 442 ** Returns: 443 ** none. 444 ** 445 ** Side Effects: 446 ** Sets verification state for TLS 447 ** 448 # if TLS_VRFY_PER_CTX 449 ** Notice: 450 ** This is per TLS context, not per TLS structure; 451 ** the former is global, the latter per connection. 452 ** It would be nice to do this per connection, but this 453 ** doesn't work in the current TLS libraries :-( 454 # endif * TLS_VRFY_PER_CTX * 455 */ 456 457 void 458 tls_set_verify(ctx, ssl, vrfy) 459 SSL_CTX *ctx; 460 SSL *ssl; 461 bool vrfy; 462 { 463 # if !TLS_VRFY_PER_CTX 464 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL); 465 # else /* !TLS_VRFY_PER_CTX */ 466 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, 467 NULL); 468 # endif /* !TLS_VRFY_PER_CTX */ 469 } 470 471 /* 472 ** status in initialization 473 ** these flags keep track of the status of the initialization 474 ** i.e., whether a file exists (_EX) and whether it can be used (_OK) 475 ** [due to permissions] 476 */ 477 478 # define TLS_S_NONE 0x00000000 /* none yet */ 479 # define TLS_S_CERT_EX 0x00000001 /* cert file exists */ 480 # define TLS_S_CERT_OK 0x00000002 /* cert file is ok */ 481 # define TLS_S_KEY_EX 0x00000004 /* key file exists */ 482 # define TLS_S_KEY_OK 0x00000008 /* key file is ok */ 483 # define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */ 484 # define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */ 485 # define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */ 486 # define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */ 487 # define TLS_S_CRLF_EX 0x00000100 /* CRL file exists */ 488 # define TLS_S_CRLF_OK 0x00000200 /* CRL file is ok */ 489 490 # define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */ 491 # define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */ 492 # define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */ 493 # define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */ 494 495 # define TLS_S_DH_OK 0x00200000 /* DH cert is ok */ 496 # define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */ 497 # define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */ 498 499 /* Type of variable */ 500 # define TLS_T_OTHER 0 501 # define TLS_T_SRV 1 502 # define TLS_T_CLT 2 503 504 /* 505 ** TLS_OK_F -- can var be an absolute filename? 506 ** 507 ** Parameters: 508 ** var -- filename 509 ** fn -- what is the filename used for? 510 ** type -- type of variable 511 ** 512 ** Returns: 513 ** ok? 514 */ 515 516 static bool 517 tls_ok_f(var, fn, type) 518 char *var; 519 char *fn; 520 int type; 521 { 522 /* must be absolute pathname */ 523 if (var != NULL && *var == '/') 524 return true; 525 if (LogLevel > 12) 526 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing", 527 type == TLS_T_SRV ? "Server" : 528 (type == TLS_T_CLT ? "Client" : ""), fn); 529 return false; 530 } 531 /* 532 ** TLS_SAFE_F -- is a file safe to use? 533 ** 534 ** Parameters: 535 ** var -- filename 536 ** sff -- flags for safefile() 537 ** srv -- server side? 538 ** 539 ** Returns: 540 ** ok? 541 */ 542 543 static bool 544 tls_safe_f(var, sff, srv) 545 char *var; 546 long sff; 547 bool srv; 548 { 549 int ret; 550 551 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff, 552 S_IRUSR, NULL)) == 0) 553 return true; 554 if (LogLevel > 7) 555 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s", 556 srv ? "server" : "client", var, sm_errstring(ret)); 557 return false; 558 } 559 560 /* 561 ** TLS_OK_F -- macro to simplify calls to tls_ok_f 562 ** 563 ** Parameters: 564 ** var -- filename 565 ** fn -- what is the filename used for? 566 ** req -- is the file required? 567 ** st -- status bit to set if ok 568 ** type -- type of variable 569 ** 570 ** Side Effects: 571 ** uses r, ok; may change ok and status. 572 ** 573 */ 574 575 # define TLS_OK_F(var, fn, req, st, type) if (ok) \ 576 { \ 577 r = tls_ok_f(var, fn, type); \ 578 if (r) \ 579 status |= st; \ 580 else if (req) \ 581 ok = false; \ 582 } 583 584 /* 585 ** TLS_UNR -- macro to return whether a file should be unreadable 586 ** 587 ** Parameters: 588 ** bit -- flag to test 589 ** req -- flags 590 ** 591 ** Returns: 592 ** 0/SFF_NORFILES 593 */ 594 # define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0) 595 # define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0) 596 # define TLS_KEYSFF(req) \ 597 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \ 598 TLS_OUNR(TLS_I_KEY_OUNR, req) : \ 599 TLS_UNR(TLS_I_KEY_UNR, req)) 600 601 /* 602 ** TLS_SAFE_F -- macro to simplify calls to tls_safe_f 603 ** 604 ** Parameters: 605 ** var -- filename 606 ** sff -- flags for safefile() 607 ** req -- is the file required? 608 ** ex -- does the file exist? 609 ** st -- status bit to set if ok 610 ** srv -- server side? 611 ** 612 ** Side Effects: 613 ** uses r, ok, ex; may change ok and status. 614 ** 615 */ 616 617 # define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \ 618 { \ 619 r = tls_safe_f(var, sff, srv); \ 620 if (r) \ 621 status |= st; \ 622 else if (req) \ 623 ok = false; \ 624 } 625 626 # if _FFR_TLS_SE_OPTS 627 /* 628 ** LOAD_CERTKEY -- load cert/key for TLS session 629 ** 630 ** Parameters: 631 ** ssl -- TLS session context 632 ** certfile -- filename of certificate 633 ** keyfile -- filename of private key 634 ** 635 ** Returns: 636 ** succeeded? 637 */ 638 639 bool 640 load_certkey(ssl, srv, certfile, keyfile) 641 SSL *ssl; 642 bool srv; 643 char *certfile; 644 char *keyfile; 645 { 646 bool ok; 647 int r; 648 long sff, status; 649 unsigned long req; 650 char *who; 651 652 ok = true; 653 who = srv ? "server" : "client"; 654 status = TLS_S_NONE; 655 req = TLS_I_CERT_EX|TLS_I_KEY_EX; 656 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 657 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT); 658 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 659 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT); 660 661 /* certfile etc. must be "safe". */ 662 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 663 | SFF_NOGWFILES | SFF_NOWWFILES 664 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 665 if (DontLockReadFiles) 666 sff |= SFF_NOLOCK; 667 668 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 669 bitset(TLS_I_CERT_EX, req), 670 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 671 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 672 bitset(TLS_I_KEY_EX, req), 673 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 674 675 # define SSL_use_cert(ssl, certfile) \ 676 SSL_use_certificate_file(ssl, certfile, SSL_FILETYPE_PEM) 677 # define SSL_USE_CERT "SSL_use_certificate_file" 678 679 if (bitset(TLS_S_CERT_OK, status) && 680 SSL_use_cert(ssl, certfile) <= 0) 681 { 682 if (LogLevel > 7) 683 { 684 sm_syslog(LOG_WARNING, NOQID, 685 "STARTTLS=%s, error: %s(%s) failed", 686 who, SSL_USE_CERT, certfile); 687 if (LogLevel > 9) 688 tlslogerr(LOG_WARNING, who); 689 } 690 if (bitset(TLS_I_USE_CERT, req)) 691 return false; 692 } 693 if (bitset(TLS_S_KEY_OK, status) && 694 SSL_use_PrivateKey_file(ssl, keyfile, SSL_FILETYPE_PEM) <= 0) 695 { 696 if (LogLevel > 7) 697 { 698 sm_syslog(LOG_WARNING, NOQID, 699 "STARTTLS=%s, error: SSL_use_PrivateKey_file(%s) failed", 700 who, keyfile); 701 if (LogLevel > 9) 702 tlslogerr(LOG_WARNING, who); 703 } 704 if (bitset(TLS_I_USE_KEY, req)) 705 return false; 706 } 707 708 /* check the private key */ 709 if (bitset(TLS_S_KEY_OK, status) && 710 (r = SSL_check_private_key(ssl)) <= 0) 711 { 712 /* Private key does not match the certificate public key */ 713 if (LogLevel > 5) 714 { 715 sm_syslog(LOG_WARNING, NOQID, 716 "STARTTLS=%s, error: SSL_check_private_key failed(%s): %d", 717 who, keyfile, r); 718 if (LogLevel > 9) 719 tlslogerr(LOG_WARNING, who); 720 } 721 if (bitset(TLS_I_USE_KEY, req)) 722 return false; 723 } 724 725 return true; 726 } 727 # endif /* _FFR_TLS_SE_OPTS */ 728 729 /* 730 ** INITTLS -- initialize TLS 731 ** 732 ** Parameters: 733 ** ctx -- pointer to context 734 ** req -- requirements for initialization (see sendmail.h) 735 ** options -- options 736 ** srv -- server side? 737 ** certfile -- filename of certificate 738 ** keyfile -- filename of private key 739 ** cacertpath -- path to CAs 740 ** cacertfile -- file with CA(s) 741 ** dhparam -- parameters for DH 742 ** 743 ** Returns: 744 ** succeeded? 745 */ 746 747 /* 748 ** The session_id_context identifies the service that created a session. 749 ** This information is used to distinguish between multiple TLS-based 750 ** servers running on the same server. We use the name of the mail system. 751 ** Note: the session cache is not persistent. 752 */ 753 754 static char server_session_id_context[] = "sendmail8"; 755 756 /* 0.9.8a and b have a problem with SSL_OP_TLS_BLOCK_PADDING_BUG */ 757 #if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) 758 # define SM_SSL_OP_TLS_BLOCK_PADDING_BUG 1 759 #else 760 # define SM_SSL_OP_TLS_BLOCK_PADDING_BUG 0 761 #endif 762 763 bool 764 inittls(ctx, req, options, srv, certfile, keyfile, cacertpath, cacertfile, dhparam) 765 SSL_CTX **ctx; 766 unsigned long req; 767 unsigned long options; 768 bool srv; 769 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam; 770 { 771 # if !NO_DH 772 static DH *dh = NULL; 773 # endif /* !NO_DH */ 774 int r; 775 bool ok; 776 long sff, status; 777 char *who; 778 char *cf2, *kf2; 779 # if SM_CONF_SHM 780 extern int ShmId; 781 # endif /* SM_CONF_SHM */ 782 # if OPENSSL_VERSION_NUMBER > 0x00907000L 783 BIO *crl_file; 784 X509_CRL *crl; 785 X509_STORE *store; 786 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 787 #if SM_SSL_OP_TLS_BLOCK_PADDING_BUG 788 long rt_version; 789 STACK_OF(SSL_COMP) *comp_methods; 790 #endif 791 792 status = TLS_S_NONE; 793 who = srv ? "server" : "client"; 794 if (ctx == NULL) 795 { 796 syserr("STARTTLS=%s, inittls: ctx == NULL", who); 797 /* NOTREACHED */ 798 SM_ASSERT(ctx != NULL); 799 } 800 801 /* already initialized? (we could re-init...) */ 802 if (*ctx != NULL) 803 return true; 804 ok = true; 805 806 /* 807 ** look for a second filename: it must be separated by a ',' 808 ** no blanks allowed (they won't be skipped). 809 ** we change a global variable here! this change will be undone 810 ** before return from the function but only if it returns true. 811 ** this isn't a problem since in a failure case this function 812 ** won't be called again with the same (overwritten) values. 813 ** otherwise each return must be replaced with a goto endinittls. 814 */ 815 816 cf2 = NULL; 817 kf2 = NULL; 818 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL) 819 { 820 *cf2++ = '\0'; 821 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL) 822 *kf2++ = '\0'; 823 } 824 825 /* 826 ** Check whether files/paths are defined 827 */ 828 829 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 830 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT); 831 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 832 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT); 833 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req), 834 TLS_S_CERTP_EX, TLS_T_OTHER); 835 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req), 836 TLS_S_CERTF_EX, TLS_T_OTHER); 837 838 # if OPENSSL_VERSION_NUMBER > 0x00907000L 839 TLS_OK_F(CRLFile, "CRLFile", bitset(TLS_I_CRLF_EX, req), 840 TLS_S_CRLF_EX, TLS_T_OTHER); 841 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 842 843 /* 844 ** if the second file is specified it must exist 845 ** XXX: it is possible here to define only one of those files 846 */ 847 848 if (cf2 != NULL) 849 { 850 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req), 851 TLS_S_CERT2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 852 } 853 if (kf2 != NULL) 854 { 855 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req), 856 TLS_S_KEY2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 857 } 858 859 /* 860 ** valid values for dhparam are (only the first char is checked) 861 ** none no parameters: don't use DH 862 ** i use precomputed 2048 bit parameters 863 ** 512 use precomputed 512 bit parameters 864 ** 1024 generate 1024 bit parameters 865 ** 2048 generate 2048 bit parameters 866 ** /file/name read parameters from /file/name 867 */ 868 869 #define SET_DH_DFL \ 870 do { \ 871 dhparam = "I"; \ 872 req |= TLS_I_DHFIXED; \ 873 } while (0) 874 875 if (bitset(TLS_I_TRY_DH, req)) 876 { 877 if (dhparam != NULL) 878 { 879 char c = *dhparam; 880 881 if (c == '1') 882 req |= TLS_I_DH1024; 883 else if (c == 'I' || c == 'i') 884 req |= TLS_I_DHFIXED; 885 else if (c == '2') 886 req |= TLS_I_DH2048; 887 else if (c == '5') 888 req |= TLS_I_DH512; 889 else if (c == 'n' || c == 'N') 890 req &= ~TLS_I_TRY_DH; 891 else if (c != '/') 892 { 893 if (LogLevel > 12) 894 sm_syslog(LOG_WARNING, NOQID, 895 "STARTTLS=%s, error: illegal value '%s' for DHParameters", 896 who, dhparam); 897 dhparam = NULL; 898 } 899 } 900 if (dhparam == NULL) 901 SET_DH_DFL; 902 else if (*dhparam == '/') 903 { 904 TLS_OK_F(dhparam, "DHParameters", 905 bitset(TLS_I_DHPAR_EX, req), 906 TLS_S_DHPAR_EX, TLS_T_OTHER); 907 } 908 } 909 if (!ok) 910 return ok; 911 912 /* certfile etc. must be "safe". */ 913 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 914 | SFF_NOGWFILES | SFF_NOWWFILES 915 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 916 if (DontLockReadFiles) 917 sff |= SFF_NOLOCK; 918 919 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 920 bitset(TLS_I_CERT_EX, req), 921 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 922 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 923 bitset(TLS_I_KEY_EX, req), 924 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 925 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req), 926 bitset(TLS_I_CERTF_EX, req), 927 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv); 928 if (dhparam != NULL && *dhparam == '/') 929 { 930 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req), 931 bitset(TLS_I_DHPAR_EX, req), 932 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv); 933 if (!bitset(TLS_S_DHPAR_OK, status)) 934 SET_DH_DFL; 935 } 936 # if OPENSSL_VERSION_NUMBER > 0x00907000L 937 TLS_SAFE_F(CRLFile, sff | TLS_UNR(TLS_I_CRLF_UNR, req), 938 bitset(TLS_I_CRLF_EX, req), 939 bitset(TLS_S_CRLF_EX, status), TLS_S_CRLF_OK, srv); 940 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 941 if (!ok) 942 return ok; 943 if (cf2 != NULL) 944 { 945 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req), 946 bitset(TLS_I_CERT_EX, req), 947 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv); 948 } 949 if (kf2 != NULL) 950 { 951 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req), 952 bitset(TLS_I_KEY_EX, req), 953 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv); 954 } 955 956 /* create a method and a new context */ 957 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() : 958 SSLv23_client_method())) == NULL) 959 { 960 if (LogLevel > 7) 961 sm_syslog(LOG_WARNING, NOQID, 962 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed", 963 who, who); 964 if (LogLevel > 9) 965 tlslogerr(LOG_WARNING, who); 966 return false; 967 } 968 969 # if OPENSSL_VERSION_NUMBER > 0x00907000L 970 if (CRLFile != NULL) 971 { 972 /* get a pointer to the current certificate validation store */ 973 store = SSL_CTX_get_cert_store(*ctx); /* does not fail */ 974 crl_file = BIO_new(BIO_s_file()); 975 if (crl_file != NULL) 976 { 977 if (BIO_read_filename(crl_file, CRLFile) >= 0) 978 { 979 crl = PEM_read_bio_X509_CRL(crl_file, NULL, 980 NULL, NULL); 981 BIO_free(crl_file); 982 X509_STORE_add_crl(store, crl); 983 X509_CRL_free(crl); 984 X509_STORE_set_flags(store, 985 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 986 X509_STORE_set_verify_cb_func(store, 987 x509_verify_cb); 988 } 989 else 990 { 991 if (LogLevel > 9) 992 { 993 sm_syslog(LOG_WARNING, NOQID, 994 "STARTTLS=%s, error: PEM_read_bio_X509_CRL(%s)=failed", 995 who, CRLFile); 996 } 997 998 /* avoid memory leaks */ 999 BIO_free(crl_file); 1000 return false; 1001 } 1002 1003 } 1004 else if (LogLevel > 9) 1005 sm_syslog(LOG_WARNING, NOQID, 1006 "STARTTLS=%s, error: BIO_new=failed", who); 1007 } 1008 else 1009 store = NULL; 1010 # if _FFR_CRLPATH 1011 if (CRLPath != NULL && store != NULL) 1012 { 1013 X509_LOOKUP *lookup; 1014 1015 lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir()); 1016 if (lookup == NULL) 1017 { 1018 if (LogLevel > 9) 1019 { 1020 sm_syslog(LOG_WARNING, NOQID, 1021 "STARTTLS=%s, error: X509_STORE_add_lookup(hash)=failed", 1022 who, CRLFile); 1023 } 1024 return false; 1025 } 1026 X509_LOOKUP_add_dir(lookup, CRLPath, X509_FILETYPE_PEM); 1027 X509_STORE_set_flags(store, 1028 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 1029 } 1030 # endif /* _FFR_CRLPATH */ 1031 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 1032 1033 # if TLS_NO_RSA 1034 /* turn off backward compatibility, required for no-rsa */ 1035 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2); 1036 # endif /* TLS_NO_RSA */ 1037 1038 1039 # if !TLS_NO_RSA 1040 /* 1041 ** Create a temporary RSA key 1042 ** XXX Maybe we shouldn't create this always (even though it 1043 ** is only at startup). 1044 ** It is a time-consuming operation and it is not always necessary. 1045 ** maybe we should do it only on demand... 1046 */ 1047 1048 # if SM_CONF_SHM 1049 if (bitset(TLS_I_RSA_TMP, req) 1050 && ShmId != SM_SHM_NO_ID) 1051 { 1052 BIGNUM *bn; 1053 1054 bn = BN_new(); 1055 rsa_tmp = RSA_new(); 1056 if (!bn || !rsa_tmp || !BN_set_word(bn, RSA_F4)) { 1057 RSA_free(rsa_tmp); 1058 rsa_tmp = NULL; 1059 } 1060 if (rsa_tmp) 1061 { 1062 if (!RSA_generate_key_ex(rsa_tmp, RSA_KEYLENGTH, bn, NULL)) 1063 { 1064 RSA_free(rsa_tmp); 1065 rsa_tmp = NULL; 1066 } 1067 } 1068 BN_free(bn); 1069 if (!rsa_tmp) 1070 { 1071 if (LogLevel > 7) 1072 { 1073 sm_syslog(LOG_WARNING, NOQID, 1074 "STARTTLS=%s, error: RSA_generate_key failed", 1075 who); 1076 if (LogLevel > 9) 1077 tlslogerr(LOG_WARNING, who); 1078 } 1079 return false; 1080 } 1081 } 1082 # endif /* SM_CONF_SHM */ 1083 # endif /* !TLS_NO_RSA */ 1084 1085 /* 1086 ** load private key 1087 ** XXX change this for DSA-only version 1088 */ 1089 1090 if (bitset(TLS_S_KEY_OK, status) && 1091 SSL_CTX_use_PrivateKey_file(*ctx, keyfile, 1092 SSL_FILETYPE_PEM) <= 0) 1093 { 1094 if (LogLevel > 7) 1095 { 1096 sm_syslog(LOG_WARNING, NOQID, 1097 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 1098 who, keyfile); 1099 if (LogLevel > 9) 1100 tlslogerr(LOG_WARNING, who); 1101 } 1102 if (bitset(TLS_I_USE_KEY, req)) 1103 return false; 1104 } 1105 1106 #if _FFR_TLS_USE_CERTIFICATE_CHAIN_FILE 1107 # define SSL_CTX_use_cert(ssl_ctx, certfile) \ 1108 SSL_CTX_use_certificate_chain_file(ssl_ctx, certfile) 1109 # define SSL_CTX_USE_CERT "SSL_CTX_use_certificate_chain_file" 1110 #else 1111 # define SSL_CTX_use_cert(ssl_ctx, certfile) \ 1112 SSL_CTX_use_certificate_file(ssl_ctx, certfile, SSL_FILETYPE_PEM) 1113 # define SSL_CTX_USE_CERT "SSL_CTX_use_certificate_file" 1114 #endif 1115 1116 /* get the certificate file */ 1117 if (bitset(TLS_S_CERT_OK, status) && 1118 SSL_CTX_use_cert(*ctx, certfile) <= 0) 1119 { 1120 if (LogLevel > 7) 1121 { 1122 sm_syslog(LOG_WARNING, NOQID, 1123 "STARTTLS=%s, error: %s(%s) failed", 1124 who, SSL_CTX_USE_CERT, certfile); 1125 if (LogLevel > 9) 1126 tlslogerr(LOG_WARNING, who); 1127 } 1128 if (bitset(TLS_I_USE_CERT, req)) 1129 return false; 1130 } 1131 1132 /* check the private key */ 1133 if (bitset(TLS_S_KEY_OK, status) && 1134 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 1135 { 1136 /* Private key does not match the certificate public key */ 1137 if (LogLevel > 5) 1138 { 1139 sm_syslog(LOG_WARNING, NOQID, 1140 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d", 1141 who, keyfile, r); 1142 if (LogLevel > 9) 1143 tlslogerr(LOG_WARNING, who); 1144 } 1145 if (bitset(TLS_I_USE_KEY, req)) 1146 return false; 1147 } 1148 1149 /* XXX this code is pretty much duplicated from above! */ 1150 1151 /* load private key */ 1152 if (bitset(TLS_S_KEY2_OK, status) && 1153 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0) 1154 { 1155 if (LogLevel > 7) 1156 { 1157 sm_syslog(LOG_WARNING, NOQID, 1158 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 1159 who, kf2); 1160 if (LogLevel > 9) 1161 tlslogerr(LOG_WARNING, who); 1162 } 1163 } 1164 1165 /* get the certificate file */ 1166 if (bitset(TLS_S_CERT2_OK, status) && 1167 SSL_CTX_use_cert(*ctx, cf2) <= 0) 1168 { 1169 if (LogLevel > 7) 1170 { 1171 sm_syslog(LOG_WARNING, NOQID, 1172 "STARTTLS=%s, error: %s(%s) failed", 1173 who, SSL_CTX_USE_CERT, cf2); 1174 if (LogLevel > 9) 1175 tlslogerr(LOG_WARNING, who); 1176 } 1177 } 1178 1179 /* also check the private key */ 1180 if (bitset(TLS_S_KEY2_OK, status) && 1181 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 1182 { 1183 /* Private key does not match the certificate public key */ 1184 if (LogLevel > 5) 1185 { 1186 sm_syslog(LOG_WARNING, NOQID, 1187 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d", 1188 who, r); 1189 if (LogLevel > 9) 1190 tlslogerr(LOG_WARNING, who); 1191 } 1192 } 1193 1194 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */ 1195 1196 #if SM_SSL_OP_TLS_BLOCK_PADDING_BUG 1197 1198 /* 1199 ** In OpenSSL 0.9.8[ab], enabling zlib compression breaks the 1200 ** padding bug work-around, leading to false positives and 1201 ** failed connections. We may not interoperate with systems 1202 ** with the bug, but this is better than breaking on all 0.9.8[ab] 1203 ** systems that have zlib support enabled. 1204 ** Note: this checks the runtime version of the library, not 1205 ** just the compile time version. 1206 */ 1207 1208 rt_version = SSLeay(); 1209 if (rt_version >= 0x00908000L && rt_version <= 0x0090802fL) 1210 { 1211 comp_methods = SSL_COMP_get_compression_methods(); 1212 if (comp_methods != NULL && sk_SSL_COMP_num(comp_methods) > 0) 1213 options &= ~SSL_OP_TLS_BLOCK_PADDING_BUG; 1214 } 1215 #endif 1216 SSL_CTX_set_options(*ctx, (long) options); 1217 1218 # if !NO_DH 1219 /* Diffie-Hellman initialization */ 1220 if (bitset(TLS_I_TRY_DH, req)) 1221 { 1222 #if _FFR_TLS_EC 1223 EC_KEY *ecdh; 1224 #endif /* _FFR_TLS_EC */ 1225 1226 if (tTd(96, 8)) 1227 sm_dprintf("inittls: req=%#lx, status=%#lx\n", 1228 req, status); 1229 if (bitset(TLS_S_DHPAR_OK, status)) 1230 { 1231 BIO *bio; 1232 1233 if ((bio = BIO_new_file(dhparam, "r")) != NULL) 1234 { 1235 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 1236 BIO_free(bio); 1237 if (dh == NULL && LogLevel > 7) 1238 { 1239 unsigned long err; 1240 1241 err = ERR_get_error(); 1242 sm_syslog(LOG_WARNING, NOQID, 1243 "STARTTLS=%s, error: cannot read DH parameters(%s): %s", 1244 who, dhparam, 1245 ERR_error_string(err, NULL)); 1246 if (LogLevel > 9) 1247 tlslogerr(LOG_WARNING, who); 1248 SET_DH_DFL; 1249 } 1250 } 1251 else 1252 { 1253 if (LogLevel > 5) 1254 { 1255 sm_syslog(LOG_WARNING, NOQID, 1256 "STARTTLS=%s, error: BIO_new_file(%s) failed", 1257 who, dhparam); 1258 if (LogLevel > 9) 1259 tlslogerr(LOG_WARNING, who); 1260 } 1261 } 1262 } 1263 if (dh == NULL && bitset(TLS_I_DH1024|TLS_I_DH2048, req)) 1264 { 1265 int bits; 1266 DSA *dsa; 1267 1268 bits = bitset(TLS_I_DH2048, req) ? 2048 : 1024; 1269 if (tTd(96, 2)) 1270 sm_dprintf("inittls: Generating %d bit DH parameters\n", bits); 1271 1272 /* this takes a while! */ 1273 dsa = DSA_new(); 1274 if (dsa) { 1275 int r; 1276 1277 r = DSA_generate_parameters_ex(dsa, bits, NULL, 0, 1278 NULL, NULL, NULL); 1279 if (r != 0) 1280 dh = DSA_dup_DH(dsa); 1281 } 1282 DSA_free(dsa); 1283 } 1284 else if (dh == NULL && bitset(TLS_I_DHFIXED, req)) 1285 { 1286 if (tTd(96, 2)) 1287 sm_dprintf("inittls: Using precomputed 2048 bit DH parameters\n"); 1288 dh = get_dh2048(); 1289 } 1290 else if (dh == NULL && bitset(TLS_I_DH512, req)) 1291 { 1292 if (tTd(96, 2)) 1293 sm_dprintf("inittls: Using precomputed 512 bit DH parameters\n"); 1294 dh = get_dh512(); 1295 } 1296 1297 if (dh == NULL) 1298 { 1299 if (LogLevel > 9) 1300 { 1301 unsigned long err; 1302 1303 err = ERR_get_error(); 1304 sm_syslog(LOG_WARNING, NOQID, 1305 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s", 1306 who, dhparam, 1307 ERR_error_string(err, NULL)); 1308 } 1309 if (bitset(TLS_I_REQ_DH, req)) 1310 return false; 1311 } 1312 else 1313 { 1314 /* important to avoid small subgroup attacks */ 1315 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE); 1316 1317 SSL_CTX_set_tmp_dh(*ctx, dh); 1318 if (LogLevel > 13) 1319 sm_syslog(LOG_INFO, NOQID, 1320 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)", 1321 who, 8 * DH_size(dh), *dhparam); 1322 DH_free(dh); 1323 } 1324 1325 #if _FFR_TLS_EC 1326 ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); 1327 if (ecdh != NULL) 1328 { 1329 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_ECDH_USE); 1330 SSL_CTX_set_tmp_ecdh(*ctx, ecdh); 1331 EC_KEY_free(ecdh); 1332 } 1333 #endif /* _FFR_TLS_EC */ 1334 1335 } 1336 # endif /* !NO_DH */ 1337 1338 1339 /* XXX do we need this cache here? */ 1340 if (bitset(TLS_I_CACHE, req)) 1341 { 1342 SSL_CTX_sess_set_cache_size(*ctx, 1); 1343 SSL_CTX_set_timeout(*ctx, 1); 1344 SSL_CTX_set_session_id_context(*ctx, 1345 (void *) &server_session_id_context, 1346 sizeof(server_session_id_context)); 1347 (void) SSL_CTX_set_session_cache_mode(*ctx, 1348 SSL_SESS_CACHE_SERVER); 1349 } 1350 else 1351 { 1352 (void) SSL_CTX_set_session_cache_mode(*ctx, 1353 SSL_SESS_CACHE_OFF); 1354 } 1355 1356 /* load certificate locations and default CA paths */ 1357 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status)) 1358 { 1359 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile, 1360 cacertpath)) == 1) 1361 { 1362 # if !TLS_NO_RSA 1363 if (bitset(TLS_I_RSA_TMP, req)) 1364 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key); 1365 # endif /* !TLS_NO_RSA */ 1366 1367 /* 1368 ** We have to install our own verify callback: 1369 ** SSL_VERIFY_PEER requests a client cert but even 1370 ** though *FAIL_IF* isn't set, the connection 1371 ** will be aborted if the client presents a cert 1372 ** that is not "liked" (can't be verified?) by 1373 ** the TLS library :-( 1374 */ 1375 1376 /* 1377 ** XXX currently we could call tls_set_verify() 1378 ** but we hope that that function will later on 1379 ** only set the mode per connection. 1380 */ 1381 SSL_CTX_set_verify(*ctx, 1382 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE 1383 : SSL_VERIFY_PEER, 1384 NULL); 1385 1386 /* install verify callback */ 1387 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb, 1388 NULL); 1389 SSL_CTX_set_client_CA_list(*ctx, 1390 SSL_load_client_CA_file(cacertfile)); 1391 } 1392 else 1393 { 1394 /* 1395 ** can't load CA data; do we care? 1396 ** the data is necessary to authenticate the client, 1397 ** which in turn would be necessary 1398 ** if we want to allow relaying based on it. 1399 */ 1400 if (LogLevel > 5) 1401 { 1402 sm_syslog(LOG_WARNING, NOQID, 1403 "STARTTLS=%s, error: load verify locs %s, %s failed: %d", 1404 who, cacertpath, cacertfile, r); 1405 if (LogLevel > 9) 1406 tlslogerr(LOG_WARNING, who); 1407 } 1408 if (bitset(TLS_I_VRFY_LOC, req)) 1409 return false; 1410 } 1411 } 1412 1413 /* XXX: make this dependent on an option? */ 1414 if (tTd(96, 9)) 1415 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb); 1416 1417 /* install our own cipher list */ 1418 if (CipherList != NULL && *CipherList != '\0') 1419 { 1420 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0) 1421 { 1422 if (LogLevel > 7) 1423 { 1424 sm_syslog(LOG_WARNING, NOQID, 1425 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored", 1426 who, CipherList); 1427 1428 if (LogLevel > 9) 1429 tlslogerr(LOG_WARNING, who); 1430 } 1431 /* failure if setting to this list is required? */ 1432 } 1433 } 1434 1435 if (LogLevel > 12) 1436 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok); 1437 1438 # if 0 1439 /* 1440 ** this label is required if we want to have a "clean" exit 1441 ** see the comments above at the initialization of cf2 1442 */ 1443 1444 endinittls: 1445 # endif /* 0 */ 1446 1447 /* undo damage to global variables */ 1448 if (cf2 != NULL) 1449 *--cf2 = ','; 1450 if (kf2 != NULL) 1451 *--kf2 = ','; 1452 1453 return ok; 1454 } 1455 1456 /* 1457 ** CERT_FP -- get cert fingerprint 1458 ** 1459 ** Parameters: 1460 ** cert -- TLS cert 1461 ** mac -- macro storage 1462 ** macro -- where to store cert fp 1463 ** 1464 ** Returns: 1465 ** <=0: cert fp calculation failed 1466 ** >0: cert fp calculation ok 1467 */ 1468 1469 static int 1470 cert_fp(cert, evp_digest, mac, macro) 1471 X509 *cert; 1472 const EVP_MD *evp_digest; 1473 MACROS_T *mac; 1474 char *macro; 1475 { 1476 unsigned int n; 1477 int r; 1478 unsigned char md[EVP_MAX_MD_SIZE]; 1479 char md5h[EVP_MAX_MD_SIZE * 3]; 1480 static const char hexcodes[] = "0123456789ABCDEF"; 1481 1482 n = 0; 1483 if (X509_digest(cert, EVP_digest, md, &n) == 0 || n <= 0) 1484 { 1485 macdefine(mac, A_TEMP, macid(macro), ""); 1486 return 0; 1487 } 1488 1489 SM_ASSERT((n * 3) + 2 < sizeof(md5h)); 1490 for (r = 0; r < (int) n; r++) 1491 { 1492 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4]; 1493 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)]; 1494 md5h[(r * 3) + 2] = ':'; 1495 } 1496 md5h[(n * 3) - 1] = '\0'; 1497 macdefine(mac, A_TEMP, macid(macro), md5h); 1498 return 1; 1499 } 1500 1501 /* 1502 ** TLS_GET_INFO -- get information about TLS connection 1503 ** 1504 ** Parameters: 1505 ** ssl -- TLS connection structure 1506 ** srv -- server or client 1507 ** host -- hostname of other side 1508 ** mac -- macro storage 1509 ** certreq -- did we ask for a cert? 1510 ** 1511 ** Returns: 1512 ** result of authentication. 1513 ** 1514 ** Side Effects: 1515 ** sets various TLS related macros. 1516 */ 1517 1518 int 1519 tls_get_info(ssl, srv, host, mac, certreq) 1520 SSL *ssl; 1521 bool srv; 1522 char *host; 1523 MACROS_T *mac; 1524 bool certreq; 1525 { 1526 const SSL_CIPHER *c; 1527 int b, r; 1528 long verifyok; 1529 char *s, *who; 1530 char bitstr[16]; 1531 X509 *cert; 1532 1533 c = SSL_get_current_cipher(ssl); 1534 1535 /* cast is just workaround for compiler warning */ 1536 macdefine(mac, A_TEMP, macid("{cipher}"), 1537 (char *) SSL_CIPHER_get_name(c)); 1538 b = SSL_CIPHER_get_bits(c, &r); 1539 (void) sm_snprintf(bitstr, sizeof(bitstr), "%d", b); 1540 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr); 1541 (void) sm_snprintf(bitstr, sizeof(bitstr), "%d", r); 1542 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr); 1543 s = (char *) SSL_get_version(ssl); 1544 if (s == NULL) 1545 s = "UNKNOWN"; 1546 macdefine(mac, A_TEMP, macid("{tls_version}"), s); 1547 1548 who = srv ? "server" : "client"; 1549 cert = SSL_get_peer_certificate(ssl); 1550 verifyok = SSL_get_verify_result(ssl); 1551 if (LogLevel > 14) 1552 sm_syslog(LOG_INFO, NOQID, 1553 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx", 1554 who, verifyok, (unsigned long) cert); 1555 if (cert != NULL) 1556 { 1557 X509_NAME *subj, *issuer; 1558 char buf[MAXNAME]; 1559 1560 subj = X509_get_subject_name(cert); 1561 issuer = X509_get_issuer_name(cert); 1562 X509_NAME_oneline(subj, buf, sizeof(buf)); 1563 macdefine(mac, A_TEMP, macid("{cert_subject}"), 1564 xtextify(buf, "<>\")")); 1565 X509_NAME_oneline(issuer, buf, sizeof(buf)); 1566 macdefine(mac, A_TEMP, macid("{cert_issuer}"), 1567 xtextify(buf, "<>\")")); 1568 1569 # define LL_BADCERT 8 1570 1571 #define CERTFPMACRO (CertFingerprintAlgorithm != NULL ? "{cert_fp}" : "{cert_md5}") 1572 1573 #define CHECK_X509_NAME(which) \ 1574 do { \ 1575 if (r == -1) \ 1576 { \ 1577 sm_strlcpy(buf, "BadCertificateUnknown", sizeof(buf)); \ 1578 if (LogLevel > LL_BADCERT) \ 1579 sm_syslog(LOG_INFO, NOQID, \ 1580 "STARTTLS=%s, relay=%.100s, field=%s, status=failed to extract CN", \ 1581 who, \ 1582 host == NULL ? "local" : host, \ 1583 which); \ 1584 } \ 1585 else if ((size_t)r >= sizeof(buf) - 1) \ 1586 { \ 1587 sm_strlcpy(buf, "BadCertificateTooLong", sizeof(buf)); \ 1588 if (LogLevel > 7) \ 1589 sm_syslog(LOG_INFO, NOQID, \ 1590 "STARTTLS=%s, relay=%.100s, field=%s, status=CN too long", \ 1591 who, \ 1592 host == NULL ? "local" : host, \ 1593 which); \ 1594 } \ 1595 else if ((size_t)r > strlen(buf)) \ 1596 { \ 1597 sm_strlcpy(buf, "BadCertificateContainsNUL", \ 1598 sizeof(buf)); \ 1599 if (LogLevel > 7) \ 1600 sm_syslog(LOG_INFO, NOQID, \ 1601 "STARTTLS=%s, relay=%.100s, field=%s, status=CN contains NUL", \ 1602 who, \ 1603 host == NULL ? "local" : host, \ 1604 which); \ 1605 } \ 1606 } while (0) 1607 1608 r = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, 1609 sizeof buf); 1610 CHECK_X509_NAME("cn_subject"); 1611 macdefine(mac, A_TEMP, macid("{cn_subject}"), 1612 xtextify(buf, "<>\")")); 1613 r = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, 1614 sizeof buf); 1615 CHECK_X509_NAME("cn_issuer"); 1616 macdefine(mac, A_TEMP, macid("{cn_issuer}"), 1617 xtextify(buf, "<>\")")); 1618 (void) cert_fp(cert, EVP_digest, mac, CERTFPMACRO); 1619 } 1620 else 1621 { 1622 macdefine(mac, A_PERM, macid("{cert_subject}"), ""); 1623 macdefine(mac, A_PERM, macid("{cert_issuer}"), ""); 1624 macdefine(mac, A_PERM, macid("{cn_subject}"), ""); 1625 macdefine(mac, A_PERM, macid("{cn_issuer}"), ""); 1626 macdefine(mac, A_TEMP, macid(CERTFPMACRO), ""); 1627 } 1628 switch (verifyok) 1629 { 1630 case X509_V_OK: 1631 if (cert != NULL) 1632 { 1633 s = "OK"; 1634 r = TLS_AUTH_OK; 1635 } 1636 else 1637 { 1638 s = certreq ? "NO" : "NOT", 1639 r = TLS_AUTH_NO; 1640 } 1641 break; 1642 default: 1643 s = "FAIL"; 1644 r = TLS_AUTH_FAIL; 1645 break; 1646 } 1647 macdefine(mac, A_PERM, macid("{verify}"), s); 1648 if (cert != NULL) 1649 X509_free(cert); 1650 1651 /* do some logging */ 1652 if (LogLevel > 8) 1653 { 1654 char *vers, *s1, *s2, *cbits, *algbits; 1655 1656 vers = macget(mac, macid("{tls_version}")); 1657 cbits = macget(mac, macid("{cipher_bits}")); 1658 algbits = macget(mac, macid("{alg_bits}")); 1659 s1 = macget(mac, macid("{verify}")); 1660 s2 = macget(mac, macid("{cipher}")); 1661 1662 /* XXX: maybe cut off ident info? */ 1663 sm_syslog(LOG_INFO, NOQID, 1664 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s", 1665 who, 1666 host == NULL ? "local" : host, 1667 vers, s1, s2, /* sm_snprintf() can deal with NULL */ 1668 algbits == NULL ? "0" : algbits, 1669 cbits == NULL ? "0" : cbits); 1670 if (LogLevel > 11) 1671 { 1672 /* 1673 ** Maybe run xuntextify on the strings? 1674 ** That is easier to read but makes it maybe a bit 1675 ** more complicated to figure out the right values 1676 ** for the access map... 1677 */ 1678 1679 s1 = macget(mac, macid("{cert_subject}")); 1680 s2 = macget(mac, macid("{cert_issuer}")); 1681 sm_syslog(LOG_INFO, NOQID, 1682 "STARTTLS=%s, cert-subject=%.256s, cert-issuer=%.256s, verifymsg=%s", 1683 who, s1, s2, 1684 X509_verify_cert_error_string(verifyok)); 1685 } 1686 } 1687 return r; 1688 } 1689 /* 1690 ** ENDTLS -- shutdown secure connection 1691 ** 1692 ** Parameters: 1693 ** ssl -- SSL connection information. 1694 ** side -- server/client (for logging). 1695 ** 1696 ** Returns: 1697 ** success? (EX_* code) 1698 */ 1699 1700 int 1701 endtls(ssl, side) 1702 SSL *ssl; 1703 char *side; 1704 { 1705 int ret = EX_OK; 1706 1707 if (ssl != NULL) 1708 { 1709 int r; 1710 1711 if ((r = SSL_shutdown(ssl)) < 0) 1712 { 1713 if (LogLevel > 11) 1714 { 1715 sm_syslog(LOG_WARNING, NOQID, 1716 "STARTTLS=%s, SSL_shutdown failed: %d", 1717 side, r); 1718 tlslogerr(LOG_WARNING, side); 1719 } 1720 ret = EX_SOFTWARE; 1721 } 1722 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL 1723 1724 /* 1725 ** Bug in OpenSSL (at least up to 0.9.6b): 1726 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE 1727 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de> 1728 ** To: openssl-users@openssl.org 1729 ** Subject: Re: SSL_shutdown() woes (fwd) 1730 ** 1731 ** The side sending the shutdown alert first will 1732 ** not care about the answer of the peer but will 1733 ** immediately return with a return value of "0" 1734 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate 1735 ** the value of "0" and as the shutdown alert of the peer was 1736 ** not received (actually, the program did not even wait for 1737 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this 1738 ** is the default rule in case everything else does not apply. 1739 ** 1740 ** For your server the problem is different, because it 1741 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN), 1742 ** then sends its response (SSL_SENT_SHUTDOWN), so for the 1743 ** server the shutdown was successfull. 1744 ** 1745 ** As is by know, you would have to call SSL_shutdown() once 1746 ** and ignore an SSL_ERROR_SYSCALL returned. Then call 1747 ** SSL_shutdown() again to actually get the server's response. 1748 ** 1749 ** In the last discussion, Bodo Moeller concluded that a 1750 ** rewrite of the shutdown code would be necessary, but 1751 ** probably with another API, as the change would not be 1752 ** compatible to the way it is now. Things do not become 1753 ** easier as other programs do not follow the shutdown 1754 ** guidelines anyway, so that a lot error conditions and 1755 ** compitibility issues would have to be caught. 1756 ** 1757 ** For now the recommondation is to ignore the error message. 1758 */ 1759 1760 else if (r == 0) 1761 { 1762 if (LogLevel > 15) 1763 { 1764 sm_syslog(LOG_WARNING, NOQID, 1765 "STARTTLS=%s, SSL_shutdown not done", 1766 side); 1767 tlslogerr(LOG_WARNING, side); 1768 } 1769 ret = EX_SOFTWARE; 1770 } 1771 # endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */ 1772 SSL_free(ssl); 1773 ssl = NULL; 1774 } 1775 return ret; 1776 } 1777 1778 # if !TLS_NO_RSA 1779 /* 1780 ** TMP_RSA_KEY -- return temporary RSA key 1781 ** 1782 ** Parameters: 1783 ** s -- TLS connection structure 1784 ** export -- 1785 ** keylength -- 1786 ** 1787 ** Returns: 1788 ** temporary RSA key. 1789 */ 1790 1791 # ifndef MAX_RSA_TMP_CNT 1792 # define MAX_RSA_TMP_CNT 1000 /* XXX better value? */ 1793 # endif /* ! MAX_RSA_TMP_CNT */ 1794 1795 /* ARGUSED0 */ 1796 static RSA * 1797 tmp_rsa_key(s, export, keylength) 1798 SSL *s; 1799 int export; 1800 int keylength; 1801 { 1802 BIGNUM *bn; 1803 int ret; 1804 1805 # if SM_CONF_SHM 1806 extern int ShmId; 1807 extern int *PRSATmpCnt; 1808 1809 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL && 1810 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT) 1811 return rsa_tmp; 1812 # endif /* SM_CONF_SHM */ 1813 1814 if (rsa_tmp == NULL) { 1815 rsa_tmp = RSA_new(); 1816 if (!rsa_tmp) 1817 return NULL; 1818 } 1819 1820 bn = BN_new(); 1821 if (!bn) 1822 return NULL; 1823 if (!BN_set_word(bn, RSA_F4)) { 1824 BN_free(bn); 1825 return NULL; 1826 } 1827 ret = RSA_generate_key_ex(rsa_tmp, RSA_KEYLENGTH, bn, NULL); 1828 BN_free(bn); 1829 if (!ret) 1830 { 1831 if (LogLevel > 0) 1832 sm_syslog(LOG_ERR, NOQID, 1833 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!"); 1834 } 1835 else 1836 { 1837 # if SM_CONF_SHM 1838 # if 0 1839 /* 1840 ** XXX we can't (yet) share the new key... 1841 ** The RSA structure contains pointers hence it can't be 1842 ** easily kept in shared memory. It must be transformed 1843 ** into a continous memory region first, then stored, 1844 ** and later read out again (each time re-transformed). 1845 */ 1846 1847 if (ShmId != SM_SHM_NO_ID) 1848 *PRSATmpCnt = 0; 1849 # endif /* 0 */ 1850 # endif /* SM_CONF_SHM */ 1851 if (LogLevel > 9) 1852 sm_syslog(LOG_ERR, NOQID, 1853 "STARTTLS=server, tmp_rsa_key: new temp RSA key"); 1854 } 1855 return rsa_tmp; 1856 } 1857 # endif /* !TLS_NO_RSA */ 1858 /* 1859 ** APPS_SSL_INFO_CB -- info callback for TLS connections 1860 ** 1861 ** Parameters: 1862 ** s -- TLS connection structure 1863 ** where -- state in handshake 1864 ** ret -- return code of last operation 1865 ** 1866 ** Returns: 1867 ** none. 1868 */ 1869 1870 static void 1871 apps_ssl_info_cb(s, where, ret) 1872 CONST097 SSL *s; 1873 int where; 1874 int ret; 1875 { 1876 int w; 1877 char *str; 1878 BIO *bio_err = NULL; 1879 1880 if (LogLevel > 14) 1881 sm_syslog(LOG_INFO, NOQID, 1882 "STARTTLS: info_callback where=0x%x, ret=%d", 1883 where, ret); 1884 1885 w = where & ~SSL_ST_MASK; 1886 if (bio_err == NULL) 1887 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); 1888 1889 if (bitset(SSL_ST_CONNECT, w)) 1890 str = "SSL_connect"; 1891 else if (bitset(SSL_ST_ACCEPT, w)) 1892 str = "SSL_accept"; 1893 else 1894 str = "undefined"; 1895 1896 if (bitset(SSL_CB_LOOP, where)) 1897 { 1898 if (LogLevel > 12) 1899 sm_syslog(LOG_NOTICE, NOQID, 1900 "STARTTLS: %s:%s", 1901 str, SSL_state_string_long(s)); 1902 } 1903 else if (bitset(SSL_CB_ALERT, where)) 1904 { 1905 str = bitset(SSL_CB_READ, where) ? "read" : "write"; 1906 if (LogLevel > 12) 1907 sm_syslog(LOG_NOTICE, NOQID, 1908 "STARTTLS: SSL3 alert %s:%s:%s", 1909 str, SSL_alert_type_string_long(ret), 1910 SSL_alert_desc_string_long(ret)); 1911 } 1912 else if (bitset(SSL_CB_EXIT, where)) 1913 { 1914 if (ret == 0) 1915 { 1916 if (LogLevel > 7) 1917 sm_syslog(LOG_WARNING, NOQID, 1918 "STARTTLS: %s:failed in %s", 1919 str, SSL_state_string_long(s)); 1920 } 1921 else if (ret < 0) 1922 { 1923 if (LogLevel > 7) 1924 sm_syslog(LOG_WARNING, NOQID, 1925 "STARTTLS: %s:error in %s", 1926 str, SSL_state_string_long(s)); 1927 } 1928 } 1929 } 1930 /* 1931 ** TLS_VERIFY_LOG -- log verify error for TLS certificates 1932 ** 1933 ** Parameters: 1934 ** ok -- verify ok? 1935 ** ctx -- x509 context 1936 ** name -- from where is this called? 1937 ** 1938 ** Returns: 1939 ** 1 -- ok 1940 */ 1941 1942 static int 1943 tls_verify_log(ok, ctx, name) 1944 int ok; 1945 X509_STORE_CTX *ctx; 1946 const char *name; 1947 { 1948 X509 *cert; 1949 int reason, depth; 1950 char buf[512]; 1951 1952 cert = X509_STORE_CTX_get_current_cert(ctx); 1953 reason = X509_STORE_CTX_get_error(ctx); 1954 depth = X509_STORE_CTX_get_error_depth(ctx); 1955 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf)); 1956 sm_syslog(LOG_INFO, NOQID, 1957 "STARTTLS: %s cert verify: depth=%d %s, state=%d, reason=%s", 1958 name, depth, buf, ok, X509_verify_cert_error_string(reason)); 1959 return 1; 1960 } 1961 1962 /* 1963 ** TLS_VERIFY_CB -- verify callback for TLS certificates 1964 ** 1965 ** Parameters: 1966 ** ctx -- x509 context 1967 ** 1968 ** Returns: 1969 ** accept connection? 1970 ** currently: always yes. 1971 */ 1972 1973 static int 1974 # if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 1975 tls_verify_cb(ctx) 1976 X509_STORE_CTX *ctx; 1977 # else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1978 tls_verify_cb(ctx, unused) 1979 X509_STORE_CTX *ctx; 1980 void *unused; 1981 # endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1982 { 1983 int ok; 1984 1985 /* 1986 ** man SSL_CTX_set_cert_verify_callback(): 1987 ** callback should return 1 to indicate verification success 1988 ** and 0 to indicate verification failure. 1989 */ 1990 1991 ok = X509_verify_cert(ctx); 1992 if (ok <= 0) 1993 { 1994 if (LogLevel > 13) 1995 return tls_verify_log(ok, ctx, "TLS"); 1996 } 1997 return 1; 1998 } 1999 /* 2000 ** TLSLOGERR -- log the errors from the TLS error stack 2001 ** 2002 ** Parameters: 2003 ** level -- syslog level 2004 ** who -- server/client (for logging). 2005 ** 2006 ** Returns: 2007 ** none. 2008 */ 2009 2010 void 2011 tlslogerr(level, who) 2012 int level; 2013 const char *who; 2014 { 2015 unsigned long l; 2016 int line, flags; 2017 unsigned long es; 2018 char *file, *data; 2019 char buf[256]; 2020 2021 es = CRYPTO_thread_id(); 2022 while ((l = ERR_get_error_line_data((const char **) &file, &line, 2023 (const char **) &data, &flags)) 2024 != 0) 2025 { 2026 sm_syslog(level, NOQID, 2027 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es, 2028 ERR_error_string(l, buf), 2029 file, line, 2030 bitset(ERR_TXT_STRING, flags) ? data : ""); 2031 } 2032 } 2033 2034 # if OPENSSL_VERSION_NUMBER > 0x00907000L 2035 /* 2036 ** X509_VERIFY_CB -- verify callback 2037 ** 2038 ** Parameters: 2039 ** ctx -- x509 context 2040 ** 2041 ** Returns: 2042 ** accept connection? 2043 ** currently: always yes. 2044 */ 2045 2046 static int 2047 x509_verify_cb(ok, ctx) 2048 int ok; 2049 X509_STORE_CTX *ctx; 2050 { 2051 if (ok == 0) 2052 { 2053 if (LogLevel > 13) 2054 tls_verify_log(ok, ctx, "x509"); 2055 if (X509_STORE_CTX_get_error(ctx) == X509_V_ERR_UNABLE_TO_GET_CRL) 2056 { 2057 X509_STORE_CTX_set_error(ctx, 0); 2058 return 1; /* override it */ 2059 } 2060 } 2061 return ok; 2062 } 2063 # endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 2064 #endif /* STARTTLS */ 2065