tls.c revision 285303
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 13SM_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 23static RSA *rsa_tmp = NULL; /* temporary RSA key */ 24static RSA *tmp_rsa_key __P((SSL *, int, int)); 25# endif /* !TLS_NO_RSA */ 26# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 27static int tls_verify_cb __P((X509_STORE_CTX *)); 28# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 29static int tls_verify_cb __P((X509_STORE_CTX *, void *)); 30# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 31 32# if OPENSSL_VERSION_NUMBER > 0x00907000L 33static 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 */ 41static void apps_ssl_info_cb __P((CONST097 SSL *, int , int)); 42static bool tls_ok_f __P((char *, char *, int)); 43static bool tls_safe_f __P((char *, long, bool)); 44static int tls_verify_log __P((int, X509_STORE_CTX *, const char *)); 45 46# if !NO_DH 47static DH *get_dh512 __P((void)); 48 49static 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}; 58static unsigned char dh512_g[] = 59{ 60 0x02 61}; 62 63static DH * 64get_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 77# if 0 78 79This is the data from which the C code has been generated: 80 81-----BEGIN DH PARAMETERS----- 82MIIBCAKCAQEArDcgcLpxEksQHPlolRKCUJ2szKRziseWV9cUSQNZGxoGw7KkROz4 83HF9QSbg5axyNIG+QbZYtx0jp3l6/GWq1dLOj27yZkgYgaYgFrvKPiZ2jJ5xETQVH 84UpZwbjRcyjyWkWYJVsx1aF4F/iY4kT0n/+iGEoimI3C9V3KXTJ2S6jIkyJ6M/CrN 85EtrDynMlUMGlc7S1ouXVOTrtKeqy3S2L9eBLxVI+sChEijGIfELupdVeXihK006p 86MgnABPDbkTx6OOtYmSZaGQX+OLW2FPmwvcrzgCz9t9cAsuUcBZv1LeHEqZZttyLU 87oK0jjSXgFyeU4/NfyA+zuNeWzUL6bHmigwIBAg== 88-----END DH PARAMETERS----- 89# endif /* 0 */ 90 91static DH * 92get_dh2048() 93{ 94 static unsigned char dh2048_p[]={ 95 0xAC,0x37,0x20,0x70,0xBA,0x71,0x12,0x4B,0x10,0x1C,0xF9,0x68, 96 0x95,0x12,0x82,0x50,0x9D,0xAC,0xCC,0xA4,0x73,0x8A,0xC7,0x96, 97 0x57,0xD7,0x14,0x49,0x03,0x59,0x1B,0x1A,0x06,0xC3,0xB2,0xA4, 98 0x44,0xEC,0xF8,0x1C,0x5F,0x50,0x49,0xB8,0x39,0x6B,0x1C,0x8D, 99 0x20,0x6F,0x90,0x6D,0x96,0x2D,0xC7,0x48,0xE9,0xDE,0x5E,0xBF, 100 0x19,0x6A,0xB5,0x74,0xB3,0xA3,0xDB,0xBC,0x99,0x92,0x06,0x20, 101 0x69,0x88,0x05,0xAE,0xF2,0x8F,0x89,0x9D,0xA3,0x27,0x9C,0x44, 102 0x4D,0x05,0x47,0x52,0x96,0x70,0x6E,0x34,0x5C,0xCA,0x3C,0x96, 103 0x91,0x66,0x09,0x56,0xCC,0x75,0x68,0x5E,0x05,0xFE,0x26,0x38, 104 0x91,0x3D,0x27,0xFF,0xE8,0x86,0x12,0x88,0xA6,0x23,0x70,0xBD, 105 0x57,0x72,0x97,0x4C,0x9D,0x92,0xEA,0x32,0x24,0xC8,0x9E,0x8C, 106 0xFC,0x2A,0xCD,0x12,0xDA,0xC3,0xCA,0x73,0x25,0x50,0xC1,0xA5, 107 0x73,0xB4,0xB5,0xA2,0xE5,0xD5,0x39,0x3A,0xED,0x29,0xEA,0xB2, 108 0xDD,0x2D,0x8B,0xF5,0xE0,0x4B,0xC5,0x52,0x3E,0xB0,0x28,0x44, 109 0x8A,0x31,0x88,0x7C,0x42,0xEE,0xA5,0xD5,0x5E,0x5E,0x28,0x4A, 110 0xD3,0x4E,0xA9,0x32,0x09,0xC0,0x04,0xF0,0xDB,0x91,0x3C,0x7A, 111 0x38,0xEB,0x58,0x99,0x26,0x5A,0x19,0x05,0xFE,0x38,0xB5,0xB6, 112 0x14,0xF9,0xB0,0xBD,0xCA,0xF3,0x80,0x2C,0xFD,0xB7,0xD7,0x00, 113 0xB2,0xE5,0x1C,0x05,0x9B,0xF5,0x2D,0xE1,0xC4,0xA9,0x96,0x6D, 114 0xB7,0x22,0xD4,0xA0,0xAD,0x23,0x8D,0x25,0xE0,0x17,0x27,0x94, 115 0xE3,0xF3,0x5F,0xC8,0x0F,0xB3,0xB8,0xD7,0x96,0xCD,0x42,0xFA, 116 0x6C,0x79,0xA2,0x83, 117 }; 118 static unsigned char dh2048_g[]={ 0x02, }; 119 DH *dh; 120 121 if ((dh=DH_new()) == NULL) 122 return(NULL); 123 dh->p=BN_bin2bn(dh2048_p,sizeof(dh2048_p),NULL); 124 dh->g=BN_bin2bn(dh2048_g,sizeof(dh2048_g),NULL); 125 if ((dh->p == NULL) || (dh->g == NULL)) 126 { 127 DH_free(dh); 128 return(NULL); 129 } 130 return(dh); 131} 132# endif /* !NO_DH */ 133 134 135/* 136** TLS_RAND_INIT -- initialize STARTTLS random generator 137** 138** Parameters: 139** randfile -- name of file with random data 140** logl -- loglevel 141** 142** Returns: 143** success/failure 144** 145** Side Effects: 146** initializes PRNG for tls library. 147*/ 148 149# define MIN_RAND_BYTES 128 /* 1024 bits */ 150 151# define RF_OK 0 /* randfile OK */ 152# define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */ 153# define RF_UNKNOWN 2 /* unknown prefix for randfile */ 154 155# define RI_NONE 0 /* no init yet */ 156# define RI_SUCCESS 1 /* init was successful */ 157# define RI_FAIL 2 /* init failed */ 158 159static bool tls_rand_init __P((char *, int)); 160 161static bool 162tls_rand_init(randfile, logl) 163 char *randfile; 164 int logl; 165{ 166# ifndef HASURANDOMDEV 167 /* not required if /dev/urandom exists, OpenSSL does it internally */ 168 169 bool ok; 170 int randdef; 171 static int done = RI_NONE; 172 173 /* 174 ** initialize PRNG 175 */ 176 177 /* did we try this before? if yes: return old value */ 178 if (done != RI_NONE) 179 return done == RI_SUCCESS; 180 181 /* set default values */ 182 ok = false; 183 done = RI_FAIL; 184 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK; 185# if EGD 186 if (randdef == RF_OK && sm_strncasecmp(randfile, "egd:", 4) == 0) 187 { 188 randfile += 4; 189 if (RAND_egd(randfile) < 0) 190 { 191 sm_syslog(LOG_WARNING, NOQID, 192 "STARTTLS: RAND_egd(%s) failed: random number generator not seeded", 193 randfile); 194 } 195 else 196 ok = true; 197 } 198 else 199# endif /* EGD */ 200 if (randdef == RF_OK && sm_strncasecmp(randfile, "file:", 5) == 0) 201 { 202 int fd; 203 long sff; 204 struct stat st; 205 206 randfile += 5; 207 sff = SFF_SAFEDIRPATH | SFF_NOWLINK 208 | SFF_NOGWFILES | SFF_NOWWFILES 209 | SFF_NOGRFILES | SFF_NOWRFILES 210 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 211 if (DontLockReadFiles) 212 sff |= SFF_NOLOCK; 213 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0) 214 { 215 if (fstat(fd, &st) < 0) 216 { 217 if (LogLevel > logl) 218 sm_syslog(LOG_ERR, NOQID, 219 "STARTTLS: can't fstat(%s)", 220 randfile); 221 } 222 else 223 { 224 bool use, problem; 225 226 use = true; 227 problem = false; 228 229 /* max. age of file: 10 minutes */ 230 if (st.st_mtime + 600 < curtime()) 231 { 232 use = bitnset(DBS_INSUFFICIENTENTROPY, 233 DontBlameSendmail); 234 problem = true; 235 if (LogLevel > logl) 236 sm_syslog(LOG_ERR, NOQID, 237 "STARTTLS: RandFile %s too old: %s", 238 randfile, 239 use ? "unsafe" : 240 "unusable"); 241 } 242 if (use && st.st_size < MIN_RAND_BYTES) 243 { 244 use = bitnset(DBS_INSUFFICIENTENTROPY, 245 DontBlameSendmail); 246 problem = true; 247 if (LogLevel > logl) 248 sm_syslog(LOG_ERR, NOQID, 249 "STARTTLS: size(%s) < %d: %s", 250 randfile, 251 MIN_RAND_BYTES, 252 use ? "unsafe" : 253 "unusable"); 254 } 255 if (use) 256 ok = RAND_load_file(randfile, -1) >= 257 MIN_RAND_BYTES; 258 if (use && !ok) 259 { 260 if (LogLevel > logl) 261 sm_syslog(LOG_WARNING, NOQID, 262 "STARTTLS: RAND_load_file(%s) failed: random number generator not seeded", 263 randfile); 264 } 265 if (problem) 266 ok = false; 267 } 268 if (ok || bitnset(DBS_INSUFFICIENTENTROPY, 269 DontBlameSendmail)) 270 { 271 /* add this even if fstat() failed */ 272 RAND_seed((void *) &st, sizeof(st)); 273 } 274 (void) close(fd); 275 } 276 else 277 { 278 if (LogLevel > logl) 279 sm_syslog(LOG_WARNING, NOQID, 280 "STARTTLS: Warning: safeopen(%s) failed", 281 randfile); 282 } 283 } 284 else if (randdef == RF_OK) 285 { 286 if (LogLevel > logl) 287 sm_syslog(LOG_WARNING, NOQID, 288 "STARTTLS: Error: no proper random file definition %s", 289 randfile); 290 randdef = RF_UNKNOWN; 291 } 292 if (randdef == RF_MISS) 293 { 294 if (LogLevel > logl) 295 sm_syslog(LOG_WARNING, NOQID, 296 "STARTTLS: Error: missing random file definition"); 297 } 298 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail)) 299 { 300 int i; 301 long r; 302 unsigned char buf[MIN_RAND_BYTES]; 303 304 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */ 305 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long)) 306 { 307 r = get_random(); 308 (void) memcpy(buf + i, (void *) &r, sizeof(long)); 309 } 310 RAND_seed(buf, sizeof(buf)); 311 if (LogLevel > logl) 312 sm_syslog(LOG_WARNING, NOQID, 313 "STARTTLS: Warning: random number generator not properly seeded"); 314 ok = true; 315 } 316 done = ok ? RI_SUCCESS : RI_FAIL; 317 return ok; 318# else /* ! HASURANDOMDEV */ 319 return true; 320# endif /* ! HASURANDOMDEV */ 321} 322/* 323** INIT_TLS_LIBRARY -- Calls functions which setup TLS library for global use. 324** 325** Parameters: 326** fipsmode -- use FIPS? 327** 328** Returns: 329** succeeded? 330*/ 331 332bool 333init_tls_library(fipsmode) 334 bool fipsmode; 335{ 336 bool bv; 337 338 /* basic TLS initialization, ignore result for now */ 339 SSL_library_init(); 340 SSL_load_error_strings(); 341 OpenSSL_add_all_algorithms(); 342# if 0 343 /* this is currently a macro for SSL_library_init */ 344 SSLeay_add_ssl_algorithms(); 345# endif /* 0 */ 346 347 bv = tls_rand_init(RandFile, 7); 348# if _FFR_FIPSMODE 349 if (bv && fipsmode) 350 { 351 if (!FIPS_mode_set(1)) 352 { 353 unsigned long err; 354 355 err = ERR_get_error(); 356 if (LogLevel > 0) 357 sm_syslog(LOG_ERR, NOQID, 358 "STARTTLS=init, FIPSMode=%s", 359 ERR_error_string(err, NULL)); 360 return false; 361 } 362 else 363 { 364 if (LogLevel > 9) 365 sm_syslog(LOG_INFO, NOQID, 366 "STARTTLS=init, FIPSMode=ok"); 367 } 368 } 369#endif /* _FFR_FIPSMODE */ 370 if (bv && CertFingerprintAlgorithm != NULL) 371 { 372 const EVP_MD *md; 373 374 md = EVP_get_digestbyname(CertFingerprintAlgorithm); 375 if (NULL == md) 376 { 377 bv = false; 378 if (LogLevel > 0) 379 sm_syslog(LOG_ERR, NOQID, 380 "STARTTLS=init, CertFingerprintAlgorithm=%s, status=invalid" 381 , CertFingerprintAlgorithm); 382 } 383 else 384 EVP_digest = md; 385 } 386 return bv; 387} 388 389/* 390** TLS_SET_VERIFY -- request client certificate? 391** 392** Parameters: 393** ctx -- TLS context 394** ssl -- TLS structure 395** vrfy -- request certificate? 396** 397** Returns: 398** none. 399** 400** Side Effects: 401** Sets verification state for TLS 402** 403# if TLS_VRFY_PER_CTX 404** Notice: 405** This is per TLS context, not per TLS structure; 406** the former is global, the latter per connection. 407** It would be nice to do this per connection, but this 408** doesn't work in the current TLS libraries :-( 409# endif * TLS_VRFY_PER_CTX * 410*/ 411 412void 413tls_set_verify(ctx, ssl, vrfy) 414 SSL_CTX *ctx; 415 SSL *ssl; 416 bool vrfy; 417{ 418# if !TLS_VRFY_PER_CTX 419 SSL_set_verify(ssl, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, NULL); 420# else /* !TLS_VRFY_PER_CTX */ 421 SSL_CTX_set_verify(ctx, vrfy ? SSL_VERIFY_PEER : SSL_VERIFY_NONE, 422 NULL); 423# endif /* !TLS_VRFY_PER_CTX */ 424} 425 426/* 427** status in initialization 428** these flags keep track of the status of the initialization 429** i.e., whether a file exists (_EX) and whether it can be used (_OK) 430** [due to permissions] 431*/ 432 433# define TLS_S_NONE 0x00000000 /* none yet */ 434# define TLS_S_CERT_EX 0x00000001 /* cert file exists */ 435# define TLS_S_CERT_OK 0x00000002 /* cert file is ok */ 436# define TLS_S_KEY_EX 0x00000004 /* key file exists */ 437# define TLS_S_KEY_OK 0x00000008 /* key file is ok */ 438# define TLS_S_CERTP_EX 0x00000010 /* CA cert path exists */ 439# define TLS_S_CERTP_OK 0x00000020 /* CA cert path is ok */ 440# define TLS_S_CERTF_EX 0x00000040 /* CA cert file exists */ 441# define TLS_S_CERTF_OK 0x00000080 /* CA cert file is ok */ 442# define TLS_S_CRLF_EX 0x00000100 /* CRL file exists */ 443# define TLS_S_CRLF_OK 0x00000200 /* CRL file is ok */ 444 445# define TLS_S_CERT2_EX 0x00001000 /* 2nd cert file exists */ 446# define TLS_S_CERT2_OK 0x00002000 /* 2nd cert file is ok */ 447# define TLS_S_KEY2_EX 0x00004000 /* 2nd key file exists */ 448# define TLS_S_KEY2_OK 0x00008000 /* 2nd key file is ok */ 449 450# define TLS_S_DH_OK 0x00200000 /* DH cert is ok */ 451# define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */ 452# define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */ 453 454/* Type of variable */ 455# define TLS_T_OTHER 0 456# define TLS_T_SRV 1 457# define TLS_T_CLT 2 458 459/* 460** TLS_OK_F -- can var be an absolute filename? 461** 462** Parameters: 463** var -- filename 464** fn -- what is the filename used for? 465** type -- type of variable 466** 467** Returns: 468** ok? 469*/ 470 471static bool 472tls_ok_f(var, fn, type) 473 char *var; 474 char *fn; 475 int type; 476{ 477 /* must be absolute pathname */ 478 if (var != NULL && *var == '/') 479 return true; 480 if (LogLevel > 12) 481 sm_syslog(LOG_WARNING, NOQID, "STARTTLS: %s%s missing", 482 type == TLS_T_SRV ? "Server" : 483 (type == TLS_T_CLT ? "Client" : ""), fn); 484 return false; 485} 486/* 487** TLS_SAFE_F -- is a file safe to use? 488** 489** Parameters: 490** var -- filename 491** sff -- flags for safefile() 492** srv -- server side? 493** 494** Returns: 495** ok? 496*/ 497 498static bool 499tls_safe_f(var, sff, srv) 500 char *var; 501 long sff; 502 bool srv; 503{ 504 int ret; 505 506 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff, 507 S_IRUSR, NULL)) == 0) 508 return true; 509 if (LogLevel > 7) 510 sm_syslog(LOG_WARNING, NOQID, "STARTTLS=%s: file %s unsafe: %s", 511 srv ? "server" : "client", var, sm_errstring(ret)); 512 return false; 513} 514 515/* 516** TLS_OK_F -- macro to simplify calls to tls_ok_f 517** 518** Parameters: 519** var -- filename 520** fn -- what is the filename used for? 521** req -- is the file required? 522** st -- status bit to set if ok 523** type -- type of variable 524** 525** Side Effects: 526** uses r, ok; may change ok and status. 527** 528*/ 529 530# define TLS_OK_F(var, fn, req, st, type) if (ok) \ 531 { \ 532 r = tls_ok_f(var, fn, type); \ 533 if (r) \ 534 status |= st; \ 535 else if (req) \ 536 ok = false; \ 537 } 538 539/* 540** TLS_UNR -- macro to return whether a file should be unreadable 541** 542** Parameters: 543** bit -- flag to test 544** req -- flags 545** 546** Returns: 547** 0/SFF_NORFILES 548*/ 549# define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0) 550# define TLS_OUNR(bit, req) (bitset(bit, req) ? SFF_NOWRFILES : 0) 551# define TLS_KEYSFF(req) \ 552 (bitnset(DBS_GROUPREADABLEKEYFILE, DontBlameSendmail) ? \ 553 TLS_OUNR(TLS_I_KEY_OUNR, req) : \ 554 TLS_UNR(TLS_I_KEY_UNR, req)) 555 556/* 557** TLS_SAFE_F -- macro to simplify calls to tls_safe_f 558** 559** Parameters: 560** var -- filename 561** sff -- flags for safefile() 562** req -- is the file required? 563** ex -- does the file exist? 564** st -- status bit to set if ok 565** srv -- server side? 566** 567** Side Effects: 568** uses r, ok, ex; may change ok and status. 569** 570*/ 571 572# define TLS_SAFE_F(var, sff, req, ex, st, srv) if (ex && ok) \ 573 { \ 574 r = tls_safe_f(var, sff, srv); \ 575 if (r) \ 576 status |= st; \ 577 else if (req) \ 578 ok = false; \ 579 } 580 581# if _FFR_TLS_SE_OPTS 582/* 583** LOAD_CERTKEY -- load cert/key for TLS session 584** 585** Parameters: 586** ssl -- TLS session context 587** certfile -- filename of certificate 588** keyfile -- filename of private key 589** 590** Returns: 591** succeeded? 592*/ 593 594bool 595load_certkey(ssl, srv, certfile, keyfile) 596 SSL *ssl; 597 bool srv; 598 char *certfile; 599 char *keyfile; 600{ 601 bool ok; 602 int r; 603 long sff, status; 604 unsigned long req; 605 char *who; 606 607 ok = true; 608 who = srv ? "server" : "client"; 609 status = TLS_S_NONE; 610 req = TLS_I_CERT_EX|TLS_I_KEY_EX; 611 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 612 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT); 613 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 614 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT); 615 616 /* certfile etc. must be "safe". */ 617 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 618 | SFF_NOGWFILES | SFF_NOWWFILES 619 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 620 if (DontLockReadFiles) 621 sff |= SFF_NOLOCK; 622 623 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 624 bitset(TLS_I_CERT_EX, req), 625 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 626 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 627 bitset(TLS_I_KEY_EX, req), 628 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 629 630# define SSL_use_cert(ssl, certfile) \ 631 SSL_use_certificate_file(ssl, certfile, SSL_FILETYPE_PEM) 632# define SSL_USE_CERT "SSL_use_certificate_file" 633 634 if (bitset(TLS_S_CERT_OK, status) && 635 SSL_use_cert(ssl, certfile) <= 0) 636 { 637 if (LogLevel > 7) 638 { 639 sm_syslog(LOG_WARNING, NOQID, 640 "STARTTLS=%s, error: %s(%s) failed", 641 who, SSL_USE_CERT, certfile); 642 if (LogLevel > 9) 643 tlslogerr(LOG_WARNING, who); 644 } 645 if (bitset(TLS_I_USE_CERT, req)) 646 return false; 647 } 648 if (bitset(TLS_S_KEY_OK, status) && 649 SSL_use_PrivateKey_file(ssl, keyfile, SSL_FILETYPE_PEM) <= 0) 650 { 651 if (LogLevel > 7) 652 { 653 sm_syslog(LOG_WARNING, NOQID, 654 "STARTTLS=%s, error: SSL_use_PrivateKey_file(%s) failed", 655 who, keyfile); 656 if (LogLevel > 9) 657 tlslogerr(LOG_WARNING, who); 658 } 659 if (bitset(TLS_I_USE_KEY, req)) 660 return false; 661 } 662 663 /* check the private key */ 664 if (bitset(TLS_S_KEY_OK, status) && 665 (r = SSL_check_private_key(ssl)) <= 0) 666 { 667 /* Private key does not match the certificate public key */ 668 if (LogLevel > 5) 669 { 670 sm_syslog(LOG_WARNING, NOQID, 671 "STARTTLS=%s, error: SSL_check_private_key failed(%s): %d", 672 who, keyfile, r); 673 if (LogLevel > 9) 674 tlslogerr(LOG_WARNING, who); 675 } 676 if (bitset(TLS_I_USE_KEY, req)) 677 return false; 678 } 679 680 return true; 681} 682# endif /* _FFR_TLS_SE_OPTS */ 683 684/* 685** INITTLS -- initialize TLS 686** 687** Parameters: 688** ctx -- pointer to context 689** req -- requirements for initialization (see sendmail.h) 690** options -- options 691** srv -- server side? 692** certfile -- filename of certificate 693** keyfile -- filename of private key 694** cacertpath -- path to CAs 695** cacertfile -- file with CA(s) 696** dhparam -- parameters for DH 697** 698** Returns: 699** succeeded? 700*/ 701 702/* 703** The session_id_context identifies the service that created a session. 704** This information is used to distinguish between multiple TLS-based 705** servers running on the same server. We use the name of the mail system. 706** Note: the session cache is not persistent. 707*/ 708 709static char server_session_id_context[] = "sendmail8"; 710 711/* 0.9.8a and b have a problem with SSL_OP_TLS_BLOCK_PADDING_BUG */ 712#if (OPENSSL_VERSION_NUMBER >= 0x0090800fL) 713# define SM_SSL_OP_TLS_BLOCK_PADDING_BUG 1 714#else 715# define SM_SSL_OP_TLS_BLOCK_PADDING_BUG 0 716#endif 717 718bool 719inittls(ctx, req, options, srv, certfile, keyfile, cacertpath, cacertfile, dhparam) 720 SSL_CTX **ctx; 721 unsigned long req; 722 unsigned long options; 723 bool srv; 724 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam; 725{ 726# if !NO_DH 727 static DH *dh = NULL; 728# endif /* !NO_DH */ 729 int r; 730 bool ok; 731 long sff, status; 732 char *who; 733 char *cf2, *kf2; 734# if SM_CONF_SHM 735 extern int ShmId; 736# endif /* SM_CONF_SHM */ 737# if OPENSSL_VERSION_NUMBER > 0x00907000L 738 BIO *crl_file; 739 X509_CRL *crl; 740 X509_STORE *store; 741# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 742#if SM_SSL_OP_TLS_BLOCK_PADDING_BUG 743 long rt_version; 744 STACK_OF(SSL_COMP) *comp_methods; 745#endif 746 747 status = TLS_S_NONE; 748 who = srv ? "server" : "client"; 749 if (ctx == NULL) 750 { 751 syserr("STARTTLS=%s, inittls: ctx == NULL", who); 752 /* NOTREACHED */ 753 SM_ASSERT(ctx != NULL); 754 } 755 756 /* already initialized? (we could re-init...) */ 757 if (*ctx != NULL) 758 return true; 759 ok = true; 760 761 /* 762 ** look for a second filename: it must be separated by a ',' 763 ** no blanks allowed (they won't be skipped). 764 ** we change a global variable here! this change will be undone 765 ** before return from the function but only if it returns true. 766 ** this isn't a problem since in a failure case this function 767 ** won't be called again with the same (overwritten) values. 768 ** otherwise each return must be replaced with a goto endinittls. 769 */ 770 771 cf2 = NULL; 772 kf2 = NULL; 773 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL) 774 { 775 *cf2++ = '\0'; 776 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL) 777 *kf2++ = '\0'; 778 } 779 780 /* 781 ** Check whether files/paths are defined 782 */ 783 784 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 785 TLS_S_CERT_EX, srv ? TLS_T_SRV : TLS_T_CLT); 786 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 787 TLS_S_KEY_EX, srv ? TLS_T_SRV : TLS_T_CLT); 788 TLS_OK_F(cacertpath, "CACertPath", bitset(TLS_I_CERTP_EX, req), 789 TLS_S_CERTP_EX, TLS_T_OTHER); 790 TLS_OK_F(cacertfile, "CACertFile", bitset(TLS_I_CERTF_EX, req), 791 TLS_S_CERTF_EX, TLS_T_OTHER); 792 793# if OPENSSL_VERSION_NUMBER > 0x00907000L 794 TLS_OK_F(CRLFile, "CRLFile", bitset(TLS_I_CRLF_EX, req), 795 TLS_S_CRLF_EX, TLS_T_OTHER); 796# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 797 798 /* 799 ** if the second file is specified it must exist 800 ** XXX: it is possible here to define only one of those files 801 */ 802 803 if (cf2 != NULL) 804 { 805 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req), 806 TLS_S_CERT2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 807 } 808 if (kf2 != NULL) 809 { 810 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req), 811 TLS_S_KEY2_EX, srv ? TLS_T_SRV : TLS_T_CLT); 812 } 813 814 /* 815 ** valid values for dhparam are (only the first char is checked) 816 ** none no parameters: don't use DH 817 ** i use precomputed 2048 bit parameters 818 ** 512 use precomputed 512 bit parameters 819 ** 1024 generate 1024 bit parameters 820 ** 2048 generate 2048 bit parameters 821 ** /file/name read parameters from /file/name 822 */ 823 824#define SET_DH_DFL \ 825 do { \ 826 dhparam = "I"; \ 827 req |= TLS_I_DHFIXED; \ 828 } while (0) 829 830 if (bitset(TLS_I_TRY_DH, req)) 831 { 832 if (dhparam != NULL) 833 { 834 char c = *dhparam; 835 836 if (c == '1') 837 req |= TLS_I_DH1024; 838 else if (c == 'I' || c == 'i') 839 req |= TLS_I_DHFIXED; 840 else if (c == '2') 841 req |= TLS_I_DH2048; 842 else if (c == '5') 843 req |= TLS_I_DH512; 844 else if (c == 'n' || c == 'N') 845 req &= ~TLS_I_TRY_DH; 846 else if (c != '/') 847 { 848 if (LogLevel > 12) 849 sm_syslog(LOG_WARNING, NOQID, 850 "STARTTLS=%s, error: illegal value '%s' for DHParameters", 851 who, dhparam); 852 dhparam = NULL; 853 } 854 } 855 if (dhparam == NULL) 856 SET_DH_DFL; 857 else if (*dhparam == '/') 858 { 859 TLS_OK_F(dhparam, "DHParameters", 860 bitset(TLS_I_DHPAR_EX, req), 861 TLS_S_DHPAR_EX, TLS_T_OTHER); 862 } 863 } 864 if (!ok) 865 return ok; 866 867 /* certfile etc. must be "safe". */ 868 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 869 | SFF_NOGWFILES | SFF_NOWWFILES 870 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 871 if (DontLockReadFiles) 872 sff |= SFF_NOLOCK; 873 874 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 875 bitset(TLS_I_CERT_EX, req), 876 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK, srv); 877 TLS_SAFE_F(keyfile, sff | TLS_KEYSFF(req), 878 bitset(TLS_I_KEY_EX, req), 879 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK, srv); 880 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req), 881 bitset(TLS_I_CERTF_EX, req), 882 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK, srv); 883 if (dhparam != NULL && *dhparam == '/') 884 { 885 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req), 886 bitset(TLS_I_DHPAR_EX, req), 887 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK, srv); 888 if (!bitset(TLS_S_DHPAR_OK, status)) 889 SET_DH_DFL; 890 } 891# if OPENSSL_VERSION_NUMBER > 0x00907000L 892 TLS_SAFE_F(CRLFile, sff | TLS_UNR(TLS_I_CRLF_UNR, req), 893 bitset(TLS_I_CRLF_EX, req), 894 bitset(TLS_S_CRLF_EX, status), TLS_S_CRLF_OK, srv); 895# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 896 if (!ok) 897 return ok; 898 if (cf2 != NULL) 899 { 900 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req), 901 bitset(TLS_I_CERT_EX, req), 902 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK, srv); 903 } 904 if (kf2 != NULL) 905 { 906 TLS_SAFE_F(kf2, sff | TLS_KEYSFF(req), 907 bitset(TLS_I_KEY_EX, req), 908 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK, srv); 909 } 910 911 /* create a method and a new context */ 912 if ((*ctx = SSL_CTX_new(srv ? SSLv23_server_method() : 913 SSLv23_client_method())) == NULL) 914 { 915 if (LogLevel > 7) 916 sm_syslog(LOG_WARNING, NOQID, 917 "STARTTLS=%s, error: SSL_CTX_new(SSLv23_%s_method()) failed", 918 who, who); 919 if (LogLevel > 9) 920 tlslogerr(LOG_WARNING, who); 921 return false; 922 } 923 924# if OPENSSL_VERSION_NUMBER > 0x00907000L 925 if (CRLFile != NULL) 926 { 927 /* get a pointer to the current certificate validation store */ 928 store = SSL_CTX_get_cert_store(*ctx); /* does not fail */ 929 crl_file = BIO_new(BIO_s_file_internal()); 930 if (crl_file != NULL) 931 { 932 if (BIO_read_filename(crl_file, CRLFile) >= 0) 933 { 934 crl = PEM_read_bio_X509_CRL(crl_file, NULL, 935 NULL, NULL); 936 BIO_free(crl_file); 937 X509_STORE_add_crl(store, crl); 938 X509_CRL_free(crl); 939 X509_STORE_set_flags(store, 940 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 941 X509_STORE_set_verify_cb_func(store, 942 x509_verify_cb); 943 } 944 else 945 { 946 if (LogLevel > 9) 947 { 948 sm_syslog(LOG_WARNING, NOQID, 949 "STARTTLS=%s, error: PEM_read_bio_X509_CRL(%s)=failed", 950 who, CRLFile); 951 } 952 953 /* avoid memory leaks */ 954 BIO_free(crl_file); 955 return false; 956 } 957 958 } 959 else if (LogLevel > 9) 960 sm_syslog(LOG_WARNING, NOQID, 961 "STARTTLS=%s, error: BIO_new=failed", who); 962 } 963 else 964 store = NULL; 965# if _FFR_CRLPATH 966 if (CRLPath != NULL && store != NULL) 967 { 968 X509_LOOKUP *lookup; 969 970 lookup = X509_STORE_add_lookup(store, X509_LOOKUP_hash_dir()); 971 if (lookup == NULL) 972 { 973 if (LogLevel > 9) 974 { 975 sm_syslog(LOG_WARNING, NOQID, 976 "STARTTLS=%s, error: X509_STORE_add_lookup(hash)=failed", 977 who, CRLFile); 978 } 979 return false; 980 } 981 X509_LOOKUP_add_dir(lookup, CRLPath, X509_FILETYPE_PEM); 982 X509_STORE_set_flags(store, 983 X509_V_FLAG_CRL_CHECK|X509_V_FLAG_CRL_CHECK_ALL); 984 } 985# endif /* _FFR_CRLPATH */ 986# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 987 988# if TLS_NO_RSA 989 /* turn off backward compatibility, required for no-rsa */ 990 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2); 991# endif /* TLS_NO_RSA */ 992 993 994# if !TLS_NO_RSA 995 /* 996 ** Create a temporary RSA key 997 ** XXX Maybe we shouldn't create this always (even though it 998 ** is only at startup). 999 ** It is a time-consuming operation and it is not always necessary. 1000 ** maybe we should do it only on demand... 1001 */ 1002 1003 if (bitset(TLS_I_RSA_TMP, req) 1004# if SM_CONF_SHM 1005 && ShmId != SM_SHM_NO_ID && 1006 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, 1007 NULL)) == NULL 1008# else /* SM_CONF_SHM */ 1009 && 0 /* no shared memory: no need to generate key now */ 1010# endif /* SM_CONF_SHM */ 1011 ) 1012 { 1013 if (LogLevel > 7) 1014 { 1015 sm_syslog(LOG_WARNING, NOQID, 1016 "STARTTLS=%s, error: RSA_generate_key failed", 1017 who); 1018 if (LogLevel > 9) 1019 tlslogerr(LOG_WARNING, who); 1020 } 1021 return false; 1022 } 1023# endif /* !TLS_NO_RSA */ 1024 1025 /* 1026 ** load private key 1027 ** XXX change this for DSA-only version 1028 */ 1029 1030 if (bitset(TLS_S_KEY_OK, status) && 1031 SSL_CTX_use_PrivateKey_file(*ctx, keyfile, 1032 SSL_FILETYPE_PEM) <= 0) 1033 { 1034 if (LogLevel > 7) 1035 { 1036 sm_syslog(LOG_WARNING, NOQID, 1037 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 1038 who, keyfile); 1039 if (LogLevel > 9) 1040 tlslogerr(LOG_WARNING, who); 1041 } 1042 if (bitset(TLS_I_USE_KEY, req)) 1043 return false; 1044 } 1045 1046#if _FFR_TLS_USE_CERTIFICATE_CHAIN_FILE 1047# define SSL_CTX_use_cert(ssl_ctx, certfile) \ 1048 SSL_CTX_use_certificate_chain_file(ssl_ctx, certfile) 1049# define SSL_CTX_USE_CERT "SSL_CTX_use_certificate_chain_file" 1050#else 1051# define SSL_CTX_use_cert(ssl_ctx, certfile) \ 1052 SSL_CTX_use_certificate_file(ssl_ctx, certfile, SSL_FILETYPE_PEM) 1053# define SSL_CTX_USE_CERT "SSL_CTX_use_certificate_file" 1054#endif 1055 1056 /* get the certificate file */ 1057 if (bitset(TLS_S_CERT_OK, status) && 1058 SSL_CTX_use_cert(*ctx, certfile) <= 0) 1059 { 1060 if (LogLevel > 7) 1061 { 1062 sm_syslog(LOG_WARNING, NOQID, 1063 "STARTTLS=%s, error: %s(%s) failed", 1064 who, SSL_CTX_USE_CERT, certfile); 1065 if (LogLevel > 9) 1066 tlslogerr(LOG_WARNING, who); 1067 } 1068 if (bitset(TLS_I_USE_CERT, req)) 1069 return false; 1070 } 1071 1072 /* check the private key */ 1073 if (bitset(TLS_S_KEY_OK, status) && 1074 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 1075 { 1076 /* Private key does not match the certificate public key */ 1077 if (LogLevel > 5) 1078 { 1079 sm_syslog(LOG_WARNING, NOQID, 1080 "STARTTLS=%s, error: SSL_CTX_check_private_key failed(%s): %d", 1081 who, keyfile, r); 1082 if (LogLevel > 9) 1083 tlslogerr(LOG_WARNING, who); 1084 } 1085 if (bitset(TLS_I_USE_KEY, req)) 1086 return false; 1087 } 1088 1089 /* XXX this code is pretty much duplicated from above! */ 1090 1091 /* load private key */ 1092 if (bitset(TLS_S_KEY2_OK, status) && 1093 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0) 1094 { 1095 if (LogLevel > 7) 1096 { 1097 sm_syslog(LOG_WARNING, NOQID, 1098 "STARTTLS=%s, error: SSL_CTX_use_PrivateKey_file(%s) failed", 1099 who, kf2); 1100 if (LogLevel > 9) 1101 tlslogerr(LOG_WARNING, who); 1102 } 1103 } 1104 1105 /* get the certificate file */ 1106 if (bitset(TLS_S_CERT2_OK, status) && 1107 SSL_CTX_use_cert(*ctx, cf2) <= 0) 1108 { 1109 if (LogLevel > 7) 1110 { 1111 sm_syslog(LOG_WARNING, NOQID, 1112 "STARTTLS=%s, error: %s(%s) failed", 1113 who, SSL_CTX_USE_CERT, cf2); 1114 if (LogLevel > 9) 1115 tlslogerr(LOG_WARNING, who); 1116 } 1117 } 1118 1119 /* also check the private key */ 1120 if (bitset(TLS_S_KEY2_OK, status) && 1121 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 1122 { 1123 /* Private key does not match the certificate public key */ 1124 if (LogLevel > 5) 1125 { 1126 sm_syslog(LOG_WARNING, NOQID, 1127 "STARTTLS=%s, error: SSL_CTX_check_private_key 2 failed: %d", 1128 who, r); 1129 if (LogLevel > 9) 1130 tlslogerr(LOG_WARNING, who); 1131 } 1132 } 1133 1134 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */ 1135 1136#if SM_SSL_OP_TLS_BLOCK_PADDING_BUG 1137 1138 /* 1139 ** In OpenSSL 0.9.8[ab], enabling zlib compression breaks the 1140 ** padding bug work-around, leading to false positives and 1141 ** failed connections. We may not interoperate with systems 1142 ** with the bug, but this is better than breaking on all 0.9.8[ab] 1143 ** systems that have zlib support enabled. 1144 ** Note: this checks the runtime version of the library, not 1145 ** just the compile time version. 1146 */ 1147 1148 rt_version = SSLeay(); 1149 if (rt_version >= 0x00908000L && rt_version <= 0x0090802fL) 1150 { 1151 comp_methods = SSL_COMP_get_compression_methods(); 1152 if (comp_methods != NULL && sk_SSL_COMP_num(comp_methods) > 0) 1153 options &= ~SSL_OP_TLS_BLOCK_PADDING_BUG; 1154 } 1155#endif 1156 SSL_CTX_set_options(*ctx, (long) options); 1157 1158# if !NO_DH 1159 /* Diffie-Hellman initialization */ 1160 if (bitset(TLS_I_TRY_DH, req)) 1161 { 1162#if _FFR_TLS_EC 1163 EC_KEY *ecdh; 1164#endif /* _FFR_TLS_EC */ 1165 1166 if (tTd(96, 8)) 1167 sm_dprintf("inittls: req=%#lx, status=%#lx\n", 1168 req, status); 1169 if (bitset(TLS_S_DHPAR_OK, status)) 1170 { 1171 BIO *bio; 1172 1173 if ((bio = BIO_new_file(dhparam, "r")) != NULL) 1174 { 1175 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 1176 BIO_free(bio); 1177 if (dh == NULL && LogLevel > 7) 1178 { 1179 unsigned long err; 1180 1181 err = ERR_get_error(); 1182 sm_syslog(LOG_WARNING, NOQID, 1183 "STARTTLS=%s, error: cannot read DH parameters(%s): %s", 1184 who, dhparam, 1185 ERR_error_string(err, NULL)); 1186 if (LogLevel > 9) 1187 tlslogerr(LOG_WARNING, who); 1188 SET_DH_DFL; 1189 } 1190 } 1191 else 1192 { 1193 if (LogLevel > 5) 1194 { 1195 sm_syslog(LOG_WARNING, NOQID, 1196 "STARTTLS=%s, error: BIO_new_file(%s) failed", 1197 who, dhparam); 1198 if (LogLevel > 9) 1199 tlslogerr(LOG_WARNING, who); 1200 } 1201 } 1202 } 1203 if (dh == NULL && bitset(TLS_I_DH1024|TLS_I_DH2048, req)) 1204 { 1205 int bits; 1206 DSA *dsa; 1207 1208 bits = bitset(TLS_I_DH2048, req) ? 2048 : 1024; 1209 if (tTd(96, 2)) 1210 sm_dprintf("inittls: Generating %d bit DH parameters\n", bits); 1211 1212 /* this takes a while! */ 1213 dsa = DSA_generate_parameters(bits, NULL, 0, NULL, 1214 NULL, 0, NULL); 1215 dh = DSA_dup_DH(dsa); 1216 DSA_free(dsa); 1217 } 1218 else if (dh == NULL && bitset(TLS_I_DHFIXED, req)) 1219 { 1220 if (tTd(96, 2)) 1221 sm_dprintf("inittls: Using precomputed 2048 bit DH parameters\n"); 1222 dh = get_dh2048(); 1223 } 1224 else if (dh == NULL && bitset(TLS_I_DH512, req)) 1225 { 1226 if (tTd(96, 2)) 1227 sm_dprintf("inittls: Using precomputed 512 bit DH parameters\n"); 1228 dh = get_dh512(); 1229 } 1230 1231 if (dh == NULL) 1232 { 1233 if (LogLevel > 9) 1234 { 1235 unsigned long err; 1236 1237 err = ERR_get_error(); 1238 sm_syslog(LOG_WARNING, NOQID, 1239 "STARTTLS=%s, error: cannot read or set DH parameters(%s): %s", 1240 who, dhparam, 1241 ERR_error_string(err, NULL)); 1242 } 1243 if (bitset(TLS_I_REQ_DH, req)) 1244 return false; 1245 } 1246 else 1247 { 1248 /* important to avoid small subgroup attacks */ 1249 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE); 1250 1251 SSL_CTX_set_tmp_dh(*ctx, dh); 1252 if (LogLevel > 13) 1253 sm_syslog(LOG_INFO, NOQID, 1254 "STARTTLS=%s, Diffie-Hellman init, key=%d bit (%c)", 1255 who, 8 * DH_size(dh), *dhparam); 1256 DH_free(dh); 1257 } 1258 1259#if _FFR_TLS_EC 1260 ecdh = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1); 1261 if (ecdh != NULL) 1262 { 1263 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_ECDH_USE); 1264 SSL_CTX_set_tmp_ecdh(*ctx, ecdh); 1265 EC_KEY_free(ecdh); 1266 } 1267#endif /* _FFR_TLS_EC */ 1268 1269 } 1270# endif /* !NO_DH */ 1271 1272 1273 /* XXX do we need this cache here? */ 1274 if (bitset(TLS_I_CACHE, req)) 1275 { 1276 SSL_CTX_sess_set_cache_size(*ctx, 1); 1277 SSL_CTX_set_timeout(*ctx, 1); 1278 SSL_CTX_set_session_id_context(*ctx, 1279 (void *) &server_session_id_context, 1280 sizeof(server_session_id_context)); 1281 (void) SSL_CTX_set_session_cache_mode(*ctx, 1282 SSL_SESS_CACHE_SERVER); 1283 } 1284 else 1285 { 1286 (void) SSL_CTX_set_session_cache_mode(*ctx, 1287 SSL_SESS_CACHE_OFF); 1288 } 1289 1290 /* load certificate locations and default CA paths */ 1291 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status)) 1292 { 1293 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile, 1294 cacertpath)) == 1) 1295 { 1296# if !TLS_NO_RSA 1297 if (bitset(TLS_I_RSA_TMP, req)) 1298 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key); 1299# endif /* !TLS_NO_RSA */ 1300 1301 /* 1302 ** We have to install our own verify callback: 1303 ** SSL_VERIFY_PEER requests a client cert but even 1304 ** though *FAIL_IF* isn't set, the connection 1305 ** will be aborted if the client presents a cert 1306 ** that is not "liked" (can't be verified?) by 1307 ** the TLS library :-( 1308 */ 1309 1310 /* 1311 ** XXX currently we could call tls_set_verify() 1312 ** but we hope that that function will later on 1313 ** only set the mode per connection. 1314 */ 1315 SSL_CTX_set_verify(*ctx, 1316 bitset(TLS_I_NO_VRFY, req) ? SSL_VERIFY_NONE 1317 : SSL_VERIFY_PEER, 1318 NULL); 1319 1320 /* install verify callback */ 1321 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb, 1322 NULL); 1323 SSL_CTX_set_client_CA_list(*ctx, 1324 SSL_load_client_CA_file(cacertfile)); 1325 } 1326 else 1327 { 1328 /* 1329 ** can't load CA data; do we care? 1330 ** the data is necessary to authenticate the client, 1331 ** which in turn would be necessary 1332 ** if we want to allow relaying based on it. 1333 */ 1334 if (LogLevel > 5) 1335 { 1336 sm_syslog(LOG_WARNING, NOQID, 1337 "STARTTLS=%s, error: load verify locs %s, %s failed: %d", 1338 who, cacertpath, cacertfile, r); 1339 if (LogLevel > 9) 1340 tlslogerr(LOG_WARNING, who); 1341 } 1342 if (bitset(TLS_I_VRFY_LOC, req)) 1343 return false; 1344 } 1345 } 1346 1347 /* XXX: make this dependent on an option? */ 1348 if (tTd(96, 9)) 1349 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb); 1350 1351 /* install our own cipher list */ 1352 if (CipherList != NULL && *CipherList != '\0') 1353 { 1354 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0) 1355 { 1356 if (LogLevel > 7) 1357 { 1358 sm_syslog(LOG_WARNING, NOQID, 1359 "STARTTLS=%s, error: SSL_CTX_set_cipher_list(%s) failed, list ignored", 1360 who, CipherList); 1361 1362 if (LogLevel > 9) 1363 tlslogerr(LOG_WARNING, who); 1364 } 1365 /* failure if setting to this list is required? */ 1366 } 1367 } 1368 1369 if (LogLevel > 12) 1370 sm_syslog(LOG_INFO, NOQID, "STARTTLS=%s, init=%d", who, ok); 1371 1372# if 0 1373 /* 1374 ** this label is required if we want to have a "clean" exit 1375 ** see the comments above at the initialization of cf2 1376 */ 1377 1378 endinittls: 1379# endif /* 0 */ 1380 1381 /* undo damage to global variables */ 1382 if (cf2 != NULL) 1383 *--cf2 = ','; 1384 if (kf2 != NULL) 1385 *--kf2 = ','; 1386 1387 return ok; 1388} 1389 1390/* 1391** CERT_FP -- get cert fingerprint 1392** 1393** Parameters: 1394** cert -- TLS cert 1395** mac -- macro storage 1396** macro -- where to store cert fp 1397** 1398** Returns: 1399** <=0: cert fp calculation failed 1400** >0: cert fp calculation ok 1401*/ 1402 1403static int 1404cert_fp(cert, evp_digest, mac, macro) 1405 X509 *cert; 1406 const EVP_MD *evp_digest; 1407 MACROS_T *mac; 1408 char *macro; 1409{ 1410 unsigned int n; 1411 int r; 1412 unsigned char md[EVP_MAX_MD_SIZE]; 1413 char md5h[EVP_MAX_MD_SIZE * 3]; 1414 static const char hexcodes[] = "0123456789ABCDEF"; 1415 1416 n = 0; 1417 if (X509_digest(cert, EVP_digest, md, &n) == 0 || n <= 0) 1418 { 1419 macdefine(mac, A_TEMP, macid(macro), ""); 1420 return 0; 1421 } 1422 1423 SM_ASSERT((n * 3) + 2 < sizeof(md5h)); 1424 for (r = 0; r < (int) n; r++) 1425 { 1426 md5h[r * 3] = hexcodes[(md[r] & 0xf0) >> 4]; 1427 md5h[(r * 3) + 1] = hexcodes[(md[r] & 0x0f)]; 1428 md5h[(r * 3) + 2] = ':'; 1429 } 1430 md5h[(n * 3) - 1] = '\0'; 1431 macdefine(mac, A_TEMP, macid(macro), md5h); 1432 return 1; 1433} 1434 1435/* 1436** TLS_GET_INFO -- get information about TLS connection 1437** 1438** Parameters: 1439** ssl -- TLS connection structure 1440** srv -- server or client 1441** host -- hostname of other side 1442** mac -- macro storage 1443** certreq -- did we ask for a cert? 1444** 1445** Returns: 1446** result of authentication. 1447** 1448** Side Effects: 1449** sets various TLS related macros. 1450*/ 1451 1452int 1453tls_get_info(ssl, srv, host, mac, certreq) 1454 SSL *ssl; 1455 bool srv; 1456 char *host; 1457 MACROS_T *mac; 1458 bool certreq; 1459{ 1460 const SSL_CIPHER *c; 1461 int b, r; 1462 long verifyok; 1463 char *s, *who; 1464 char bitstr[16]; 1465 X509 *cert; 1466 1467 c = SSL_get_current_cipher(ssl); 1468 1469 /* cast is just workaround for compiler warning */ 1470 macdefine(mac, A_TEMP, macid("{cipher}"), 1471 (char *) SSL_CIPHER_get_name(c)); 1472 b = SSL_CIPHER_get_bits(c, &r); 1473 (void) sm_snprintf(bitstr, sizeof(bitstr), "%d", b); 1474 macdefine(mac, A_TEMP, macid("{cipher_bits}"), bitstr); 1475 (void) sm_snprintf(bitstr, sizeof(bitstr), "%d", r); 1476 macdefine(mac, A_TEMP, macid("{alg_bits}"), bitstr); 1477 s = (char *) SSL_get_version(ssl); 1478 if (s == NULL) 1479 s = "UNKNOWN"; 1480 macdefine(mac, A_TEMP, macid("{tls_version}"), s); 1481 1482 who = srv ? "server" : "client"; 1483 cert = SSL_get_peer_certificate(ssl); 1484 verifyok = SSL_get_verify_result(ssl); 1485 if (LogLevel > 14) 1486 sm_syslog(LOG_INFO, NOQID, 1487 "STARTTLS=%s, get_verify: %ld get_peer: 0x%lx", 1488 who, verifyok, (unsigned long) cert); 1489 if (cert != NULL) 1490 { 1491 X509_NAME *subj, *issuer; 1492 char buf[MAXNAME]; 1493 1494 subj = X509_get_subject_name(cert); 1495 issuer = X509_get_issuer_name(cert); 1496 X509_NAME_oneline(subj, buf, sizeof(buf)); 1497 macdefine(mac, A_TEMP, macid("{cert_subject}"), 1498 xtextify(buf, "<>\")")); 1499 X509_NAME_oneline(issuer, buf, sizeof(buf)); 1500 macdefine(mac, A_TEMP, macid("{cert_issuer}"), 1501 xtextify(buf, "<>\")")); 1502 1503# define LL_BADCERT 8 1504 1505#define CERTFPMACRO (CertFingerprintAlgorithm != NULL ? "{cert_fp}" : "{cert_md5}") 1506 1507#define CHECK_X509_NAME(which) \ 1508 do { \ 1509 if (r == -1) \ 1510 { \ 1511 sm_strlcpy(buf, "BadCertificateUnknown", sizeof(buf)); \ 1512 if (LogLevel > LL_BADCERT) \ 1513 sm_syslog(LOG_INFO, NOQID, \ 1514 "STARTTLS=%s, relay=%.100s, field=%s, status=failed to extract CN", \ 1515 who, \ 1516 host == NULL ? "local" : host, \ 1517 which); \ 1518 } \ 1519 else if ((size_t)r >= sizeof(buf) - 1) \ 1520 { \ 1521 sm_strlcpy(buf, "BadCertificateTooLong", sizeof(buf)); \ 1522 if (LogLevel > 7) \ 1523 sm_syslog(LOG_INFO, NOQID, \ 1524 "STARTTLS=%s, relay=%.100s, field=%s, status=CN too long", \ 1525 who, \ 1526 host == NULL ? "local" : host, \ 1527 which); \ 1528 } \ 1529 else if ((size_t)r > strlen(buf)) \ 1530 { \ 1531 sm_strlcpy(buf, "BadCertificateContainsNUL", \ 1532 sizeof(buf)); \ 1533 if (LogLevel > 7) \ 1534 sm_syslog(LOG_INFO, NOQID, \ 1535 "STARTTLS=%s, relay=%.100s, field=%s, status=CN contains NUL", \ 1536 who, \ 1537 host == NULL ? "local" : host, \ 1538 which); \ 1539 } \ 1540 } while (0) 1541 1542 r = X509_NAME_get_text_by_NID(subj, NID_commonName, buf, 1543 sizeof buf); 1544 CHECK_X509_NAME("cn_subject"); 1545 macdefine(mac, A_TEMP, macid("{cn_subject}"), 1546 xtextify(buf, "<>\")")); 1547 r = X509_NAME_get_text_by_NID(issuer, NID_commonName, buf, 1548 sizeof buf); 1549 CHECK_X509_NAME("cn_issuer"); 1550 macdefine(mac, A_TEMP, macid("{cn_issuer}"), 1551 xtextify(buf, "<>\")")); 1552 (void) cert_fp(cert, EVP_digest, mac, CERTFPMACRO); 1553 } 1554 else 1555 { 1556 macdefine(mac, A_PERM, macid("{cert_subject}"), ""); 1557 macdefine(mac, A_PERM, macid("{cert_issuer}"), ""); 1558 macdefine(mac, A_PERM, macid("{cn_subject}"), ""); 1559 macdefine(mac, A_PERM, macid("{cn_issuer}"), ""); 1560 macdefine(mac, A_TEMP, macid(CERTFPMACRO), ""); 1561 } 1562 switch (verifyok) 1563 { 1564 case X509_V_OK: 1565 if (cert != NULL) 1566 { 1567 s = "OK"; 1568 r = TLS_AUTH_OK; 1569 } 1570 else 1571 { 1572 s = certreq ? "NO" : "NOT", 1573 r = TLS_AUTH_NO; 1574 } 1575 break; 1576 default: 1577 s = "FAIL"; 1578 r = TLS_AUTH_FAIL; 1579 break; 1580 } 1581 macdefine(mac, A_PERM, macid("{verify}"), s); 1582 if (cert != NULL) 1583 X509_free(cert); 1584 1585 /* do some logging */ 1586 if (LogLevel > 8) 1587 { 1588 char *vers, *s1, *s2, *cbits, *algbits; 1589 1590 vers = macget(mac, macid("{tls_version}")); 1591 cbits = macget(mac, macid("{cipher_bits}")); 1592 algbits = macget(mac, macid("{alg_bits}")); 1593 s1 = macget(mac, macid("{verify}")); 1594 s2 = macget(mac, macid("{cipher}")); 1595 1596 /* XXX: maybe cut off ident info? */ 1597 sm_syslog(LOG_INFO, NOQID, 1598 "STARTTLS=%s, relay=%.100s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s/%.6s", 1599 who, 1600 host == NULL ? "local" : host, 1601 vers, s1, s2, /* sm_snprintf() can deal with NULL */ 1602 algbits == NULL ? "0" : algbits, 1603 cbits == NULL ? "0" : cbits); 1604 if (LogLevel > 11) 1605 { 1606 /* 1607 ** Maybe run xuntextify on the strings? 1608 ** That is easier to read but makes it maybe a bit 1609 ** more complicated to figure out the right values 1610 ** for the access map... 1611 */ 1612 1613 s1 = macget(mac, macid("{cert_subject}")); 1614 s2 = macget(mac, macid("{cert_issuer}")); 1615 sm_syslog(LOG_INFO, NOQID, 1616 "STARTTLS=%s, cert-subject=%.256s, cert-issuer=%.256s, verifymsg=%s", 1617 who, s1, s2, 1618 X509_verify_cert_error_string(verifyok)); 1619 } 1620 } 1621 return r; 1622} 1623/* 1624** ENDTLS -- shutdown secure connection 1625** 1626** Parameters: 1627** ssl -- SSL connection information. 1628** side -- server/client (for logging). 1629** 1630** Returns: 1631** success? (EX_* code) 1632*/ 1633 1634int 1635endtls(ssl, side) 1636 SSL *ssl; 1637 char *side; 1638{ 1639 int ret = EX_OK; 1640 1641 if (ssl != NULL) 1642 { 1643 int r; 1644 1645 if ((r = SSL_shutdown(ssl)) < 0) 1646 { 1647 if (LogLevel > 11) 1648 { 1649 sm_syslog(LOG_WARNING, NOQID, 1650 "STARTTLS=%s, SSL_shutdown failed: %d", 1651 side, r); 1652 tlslogerr(LOG_WARNING, side); 1653 } 1654 ret = EX_SOFTWARE; 1655 } 1656# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL 1657 1658 /* 1659 ** Bug in OpenSSL (at least up to 0.9.6b): 1660 ** From: Lutz.Jaenicke@aet.TU-Cottbus.DE 1661 ** Message-ID: <20010723152244.A13122@serv01.aet.tu-cottbus.de> 1662 ** To: openssl-users@openssl.org 1663 ** Subject: Re: SSL_shutdown() woes (fwd) 1664 ** 1665 ** The side sending the shutdown alert first will 1666 ** not care about the answer of the peer but will 1667 ** immediately return with a return value of "0" 1668 ** (ssl/s3_lib.c:ssl3_shutdown()). SSL_get_error will evaluate 1669 ** the value of "0" and as the shutdown alert of the peer was 1670 ** not received (actually, the program did not even wait for 1671 ** the answer), an SSL_ERROR_SYSCALL is flagged, because this 1672 ** is the default rule in case everything else does not apply. 1673 ** 1674 ** For your server the problem is different, because it 1675 ** receives the shutdown first (setting SSL_RECEIVED_SHUTDOWN), 1676 ** then sends its response (SSL_SENT_SHUTDOWN), so for the 1677 ** server the shutdown was successfull. 1678 ** 1679 ** As is by know, you would have to call SSL_shutdown() once 1680 ** and ignore an SSL_ERROR_SYSCALL returned. Then call 1681 ** SSL_shutdown() again to actually get the server's response. 1682 ** 1683 ** In the last discussion, Bodo Moeller concluded that a 1684 ** rewrite of the shutdown code would be necessary, but 1685 ** probably with another API, as the change would not be 1686 ** compatible to the way it is now. Things do not become 1687 ** easier as other programs do not follow the shutdown 1688 ** guidelines anyway, so that a lot error conditions and 1689 ** compitibility issues would have to be caught. 1690 ** 1691 ** For now the recommondation is to ignore the error message. 1692 */ 1693 1694 else if (r == 0) 1695 { 1696 if (LogLevel > 15) 1697 { 1698 sm_syslog(LOG_WARNING, NOQID, 1699 "STARTTLS=%s, SSL_shutdown not done", 1700 side); 1701 tlslogerr(LOG_WARNING, side); 1702 } 1703 ret = EX_SOFTWARE; 1704 } 1705# endif /* !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER > 0x0090602fL */ 1706 SSL_free(ssl); 1707 ssl = NULL; 1708 } 1709 return ret; 1710} 1711 1712# if !TLS_NO_RSA 1713/* 1714** TMP_RSA_KEY -- return temporary RSA key 1715** 1716** Parameters: 1717** s -- TLS connection structure 1718** export -- 1719** keylength -- 1720** 1721** Returns: 1722** temporary RSA key. 1723*/ 1724 1725# ifndef MAX_RSA_TMP_CNT 1726# define MAX_RSA_TMP_CNT 1000 /* XXX better value? */ 1727# endif /* ! MAX_RSA_TMP_CNT */ 1728 1729/* ARGUSED0 */ 1730static RSA * 1731tmp_rsa_key(s, export, keylength) 1732 SSL *s; 1733 int export; 1734 int keylength; 1735{ 1736# if SM_CONF_SHM 1737 extern int ShmId; 1738 extern int *PRSATmpCnt; 1739 1740 if (ShmId != SM_SHM_NO_ID && rsa_tmp != NULL && 1741 ++(*PRSATmpCnt) < MAX_RSA_TMP_CNT) 1742 return rsa_tmp; 1743# endif /* SM_CONF_SHM */ 1744 1745 if (rsa_tmp != NULL) 1746 RSA_free(rsa_tmp); 1747 rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, NULL); 1748 if (rsa_tmp == NULL) 1749 { 1750 if (LogLevel > 0) 1751 sm_syslog(LOG_ERR, NOQID, 1752 "STARTTLS=server, tmp_rsa_key: RSA_generate_key failed!"); 1753 } 1754 else 1755 { 1756# if SM_CONF_SHM 1757# if 0 1758 /* 1759 ** XXX we can't (yet) share the new key... 1760 ** The RSA structure contains pointers hence it can't be 1761 ** easily kept in shared memory. It must be transformed 1762 ** into a continous memory region first, then stored, 1763 ** and later read out again (each time re-transformed). 1764 */ 1765 1766 if (ShmId != SM_SHM_NO_ID) 1767 *PRSATmpCnt = 0; 1768# endif /* 0 */ 1769# endif /* SM_CONF_SHM */ 1770 if (LogLevel > 9) 1771 sm_syslog(LOG_ERR, NOQID, 1772 "STARTTLS=server, tmp_rsa_key: new temp RSA key"); 1773 } 1774 return rsa_tmp; 1775} 1776# endif /* !TLS_NO_RSA */ 1777/* 1778** APPS_SSL_INFO_CB -- info callback for TLS connections 1779** 1780** Parameters: 1781** s -- TLS connection structure 1782** where -- state in handshake 1783** ret -- return code of last operation 1784** 1785** Returns: 1786** none. 1787*/ 1788 1789static void 1790apps_ssl_info_cb(s, where, ret) 1791 CONST097 SSL *s; 1792 int where; 1793 int ret; 1794{ 1795 int w; 1796 char *str; 1797 BIO *bio_err = NULL; 1798 1799 if (LogLevel > 14) 1800 sm_syslog(LOG_INFO, NOQID, 1801 "STARTTLS: info_callback where=0x%x, ret=%d", 1802 where, ret); 1803 1804 w = where & ~SSL_ST_MASK; 1805 if (bio_err == NULL) 1806 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); 1807 1808 if (bitset(SSL_ST_CONNECT, w)) 1809 str = "SSL_connect"; 1810 else if (bitset(SSL_ST_ACCEPT, w)) 1811 str = "SSL_accept"; 1812 else 1813 str = "undefined"; 1814 1815 if (bitset(SSL_CB_LOOP, where)) 1816 { 1817 if (LogLevel > 12) 1818 sm_syslog(LOG_NOTICE, NOQID, 1819 "STARTTLS: %s:%s", 1820 str, SSL_state_string_long(s)); 1821 } 1822 else if (bitset(SSL_CB_ALERT, where)) 1823 { 1824 str = bitset(SSL_CB_READ, where) ? "read" : "write"; 1825 if (LogLevel > 12) 1826 sm_syslog(LOG_NOTICE, NOQID, 1827 "STARTTLS: SSL3 alert %s:%s:%s", 1828 str, SSL_alert_type_string_long(ret), 1829 SSL_alert_desc_string_long(ret)); 1830 } 1831 else if (bitset(SSL_CB_EXIT, where)) 1832 { 1833 if (ret == 0) 1834 { 1835 if (LogLevel > 7) 1836 sm_syslog(LOG_WARNING, NOQID, 1837 "STARTTLS: %s:failed in %s", 1838 str, SSL_state_string_long(s)); 1839 } 1840 else if (ret < 0) 1841 { 1842 if (LogLevel > 7) 1843 sm_syslog(LOG_WARNING, NOQID, 1844 "STARTTLS: %s:error in %s", 1845 str, SSL_state_string_long(s)); 1846 } 1847 } 1848} 1849/* 1850** TLS_VERIFY_LOG -- log verify error for TLS certificates 1851** 1852** Parameters: 1853** ok -- verify ok? 1854** ctx -- x509 context 1855** name -- from where is this called? 1856** 1857** Returns: 1858** 1 -- ok 1859*/ 1860 1861static int 1862tls_verify_log(ok, ctx, name) 1863 int ok; 1864 X509_STORE_CTX *ctx; 1865 const char *name; 1866{ 1867 X509 *cert; 1868 int reason, depth; 1869 char buf[512]; 1870 1871 cert = X509_STORE_CTX_get_current_cert(ctx); 1872 reason = X509_STORE_CTX_get_error(ctx); 1873 depth = X509_STORE_CTX_get_error_depth(ctx); 1874 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof(buf)); 1875 sm_syslog(LOG_INFO, NOQID, 1876 "STARTTLS: %s cert verify: depth=%d %s, state=%d, reason=%s", 1877 name, depth, buf, ok, X509_verify_cert_error_string(reason)); 1878 return 1; 1879} 1880 1881/* 1882** TLS_VERIFY_CB -- verify callback for TLS certificates 1883** 1884** Parameters: 1885** ctx -- x509 context 1886** 1887** Returns: 1888** accept connection? 1889** currently: always yes. 1890*/ 1891 1892static int 1893# if !defined(OPENSSL_VERSION_NUMBER) || OPENSSL_VERSION_NUMBER < 0x00907000L 1894tls_verify_cb(ctx) 1895 X509_STORE_CTX *ctx; 1896# else /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1897tls_verify_cb(ctx, unused) 1898 X509_STORE_CTX *ctx; 1899 void *unused; 1900# endif /* !defined() || OPENSSL_VERSION_NUMBER < 0x00907000L */ 1901{ 1902 int ok; 1903 1904 /* 1905 ** man SSL_CTX_set_cert_verify_callback(): 1906 ** callback should return 1 to indicate verification success 1907 ** and 0 to indicate verification failure. 1908 */ 1909 1910 ok = X509_verify_cert(ctx); 1911 if (ok <= 0) 1912 { 1913 if (LogLevel > 13) 1914 return tls_verify_log(ok, ctx, "TLS"); 1915 } 1916 return 1; 1917} 1918/* 1919** TLSLOGERR -- log the errors from the TLS error stack 1920** 1921** Parameters: 1922** level -- syslog level 1923** who -- server/client (for logging). 1924** 1925** Returns: 1926** none. 1927*/ 1928 1929void 1930tlslogerr(level, who) 1931 int level; 1932 const char *who; 1933{ 1934 unsigned long l; 1935 int line, flags; 1936 unsigned long es; 1937 char *file, *data; 1938 char buf[256]; 1939 1940 es = CRYPTO_thread_id(); 1941 while ((l = ERR_get_error_line_data((const char **) &file, &line, 1942 (const char **) &data, &flags)) 1943 != 0) 1944 { 1945 sm_syslog(level, NOQID, 1946 "STARTTLS=%s: %lu:%s:%s:%d:%s", who, es, 1947 ERR_error_string(l, buf), 1948 file, line, 1949 bitset(ERR_TXT_STRING, flags) ? data : ""); 1950 } 1951} 1952 1953# if OPENSSL_VERSION_NUMBER > 0x00907000L 1954/* 1955** X509_VERIFY_CB -- verify callback 1956** 1957** Parameters: 1958** ctx -- x509 context 1959** 1960** Returns: 1961** accept connection? 1962** currently: always yes. 1963*/ 1964 1965static int 1966x509_verify_cb(ok, ctx) 1967 int ok; 1968 X509_STORE_CTX *ctx; 1969{ 1970 if (ok == 0) 1971 { 1972 if (LogLevel > 13) 1973 tls_verify_log(ok, ctx, "x509"); 1974 if (ctx->error == X509_V_ERR_UNABLE_TO_GET_CRL) 1975 { 1976 ctx->error = 0; 1977 return 1; /* override it */ 1978 } 1979 } 1980 return ok; 1981} 1982# endif /* OPENSSL_VERSION_NUMBER > 0x00907000L */ 1983#endif /* STARTTLS */ 1984