1 /* $NetBSD: tls_o.c,v 1.4 2014/05/28 10:12:43 tron Exp $ */ 2 3 /* tls_o.c - Handle tls/ssl using OpenSSL */ 4 /* $OpenLDAP$ */ 5 /* This work is part of OpenLDAP Software <http://www.openldap.org/>. 6 * 7 * Copyright 2008-2014 The OpenLDAP Foundation. 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted only as authorized by the OpenLDAP 12 * Public License. 13 * 14 * A copy of this license is available in the file LICENSE in the 15 * top-level directory of the distribution or, alternatively, at 16 * <http://www.OpenLDAP.org/license.html>. 17 */ 18 /* ACKNOWLEDGEMENTS: Rewritten by Howard Chu 19 */ 20 21 #include "portable.h" 22 23 #ifdef HAVE_OPENSSL 24 25 #include "ldap_config.h" 26 27 #include <stdio.h> 28 29 #include <ac/stdlib.h> 30 #include <ac/errno.h> 31 #include <ac/socket.h> 32 #include <ac/string.h> 33 #include <ac/ctype.h> 34 #include <ac/time.h> 35 #include <ac/unistd.h> 36 #include <ac/param.h> 37 #include <ac/dirent.h> 38 39 #include "ldap-int.h" 40 #include "ldap-tls.h" 41 42 #ifdef HAVE_OPENSSL_SSL_H 43 #include <openssl/ssl.h> 44 #include <openssl/x509v3.h> 45 #include <openssl/err.h> 46 #include <openssl/rand.h> 47 #include <openssl/safestack.h> 48 #elif defined( HAVE_SSL_H ) 49 #include <ssl.h> 50 #endif 51 52 typedef SSL_CTX tlso_ctx; 53 typedef SSL tlso_session; 54 55 static int tlso_opt_trace = 1; 56 57 static void tlso_report_error( void ); 58 59 static void tlso_info_cb( const SSL *ssl, int where, int ret ); 60 static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx ); 61 static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx ); 62 static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length ); 63 64 static DH * tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length ); 65 66 typedef struct dhplist { 67 struct dhplist *next; 68 int keylength; 69 DH *param; 70 } dhplist; 71 72 static dhplist *tlso_dhparams; 73 74 static int tlso_seed_PRNG( const char *randfile ); 75 76 #ifdef LDAP_R_COMPILE 77 /* 78 * provide mutexes for the OpenSSL library. 79 */ 80 static ldap_pvt_thread_mutex_t tlso_mutexes[CRYPTO_NUM_LOCKS]; 81 static ldap_pvt_thread_mutex_t tlso_dh_mutex; 82 83 static void tlso_locking_cb( int mode, int type, const char *file, int line ) 84 { 85 if ( mode & CRYPTO_LOCK ) { 86 ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] ); 87 } else { 88 ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] ); 89 } 90 } 91 92 static unsigned long tlso_thread_self( void ) 93 { 94 /* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t 95 * is an integral type that fits in an unsigned long 96 */ 97 98 /* force an error if the ldap_pvt_thread_t type is too large */ 99 enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) }; 100 typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1]; 101 102 return (unsigned long) ldap_pvt_thread_self(); 103 } 104 105 static void tlso_thr_init( void ) 106 { 107 int i; 108 109 for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) { 110 ldap_pvt_thread_mutex_init( &tlso_mutexes[i] ); 111 } 112 ldap_pvt_thread_mutex_init( &tlso_dh_mutex ); 113 CRYPTO_set_locking_callback( tlso_locking_cb ); 114 CRYPTO_set_id_callback( tlso_thread_self ); 115 } 116 #endif /* LDAP_R_COMPILE */ 117 118 static STACK_OF(X509_NAME) * 119 tlso_ca_list( char * bundle, char * dir ) 120 { 121 STACK_OF(X509_NAME) *ca_list = NULL; 122 123 if ( bundle ) { 124 ca_list = SSL_load_client_CA_file( bundle ); 125 } 126 #if defined(HAVE_DIRENT_H) || defined(dirent) 127 if ( dir ) { 128 int freeit = 0; 129 130 if ( !ca_list ) { 131 ca_list = sk_X509_NAME_new_null(); 132 freeit = 1; 133 } 134 if ( !SSL_add_dir_cert_subjects_to_stack( ca_list, dir ) && 135 freeit ) { 136 sk_X509_NAME_free( ca_list ); 137 ca_list = NULL; 138 } 139 } 140 #endif 141 return ca_list; 142 } 143 144 /* 145 * Initialize TLS subsystem. Should be called only once. 146 */ 147 static int 148 tlso_init( void ) 149 { 150 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT(); 151 #ifdef HAVE_EBCDIC 152 { 153 char *file = LDAP_STRDUP( lo->ldo_tls_randfile ); 154 if ( file ) __atoe( file ); 155 (void) tlso_seed_PRNG( file ); 156 LDAP_FREE( file ); 157 } 158 #else 159 (void) tlso_seed_PRNG( lo->ldo_tls_randfile ); 160 #endif 161 162 SSL_load_error_strings(); 163 SSL_library_init(); 164 OpenSSL_add_all_digests(); 165 166 /* FIXME: mod_ssl does this */ 167 X509V3_add_standard_extensions(); 168 169 return 0; 170 } 171 172 /* 173 * Tear down the TLS subsystem. Should only be called once. 174 */ 175 static void 176 tlso_destroy( void ) 177 { 178 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT(); 179 180 EVP_cleanup(); 181 ERR_remove_state(0); 182 ERR_free_strings(); 183 184 if ( lo->ldo_tls_randfile ) { 185 LDAP_FREE( lo->ldo_tls_randfile ); 186 lo->ldo_tls_randfile = NULL; 187 } 188 } 189 190 static tls_ctx * 191 tlso_ctx_new( struct ldapoptions *lo ) 192 { 193 return (tls_ctx *) SSL_CTX_new( SSLv23_method() ); 194 } 195 196 static void 197 tlso_ctx_ref( tls_ctx *ctx ) 198 { 199 tlso_ctx *c = (tlso_ctx *)ctx; 200 CRYPTO_add( &c->references, 1, CRYPTO_LOCK_SSL_CTX ); 201 } 202 203 static void 204 tlso_ctx_free ( tls_ctx *ctx ) 205 { 206 tlso_ctx *c = (tlso_ctx *)ctx; 207 SSL_CTX_free( c ); 208 } 209 210 /* 211 * initialize a new TLS context 212 */ 213 static int 214 tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server ) 215 { 216 tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx; 217 int i; 218 219 if ( is_server ) { 220 SSL_CTX_set_session_id_context( ctx, 221 (const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 ); 222 } 223 224 #ifdef SSL_OP_NO_TLSv1 225 #ifdef SSL_OP_NO_TLSv1_1 226 #ifdef SSL_OP_NO_TLSv1_2 227 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_2) 228 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | 229 SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 | 230 SSL_OP_NO_TLSv1_2 ); 231 else 232 #endif 233 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_1) 234 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | 235 SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 ); 236 else 237 #endif 238 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_0) 239 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | 240 SSL_OP_NO_TLSv1); 241 else 242 #endif 243 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 ) 244 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 ); 245 else if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 ) 246 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 ); 247 248 if ( lo->ldo_tls_ciphersuite && 249 !SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) ) 250 { 251 Debug( LDAP_DEBUG_ANY, 252 "TLS: could not set cipher list %s.\n", 253 lo->ldo_tls_ciphersuite, 0, 0 ); 254 tlso_report_error(); 255 return -1; 256 } 257 258 if (lo->ldo_tls_cacertfile != NULL || lo->ldo_tls_cacertdir != NULL) { 259 if ( !SSL_CTX_load_verify_locations( ctx, 260 lt->lt_cacertfile, lt->lt_cacertdir ) || 261 !SSL_CTX_set_default_verify_paths( ctx ) ) 262 { 263 Debug( LDAP_DEBUG_ANY, "TLS: " 264 "could not load verify locations (file:`%s',dir:`%s').\n", 265 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "", 266 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "", 267 0 ); 268 tlso_report_error(); 269 return -1; 270 } 271 272 if ( is_server ) { 273 STACK_OF(X509_NAME) *calist; 274 /* List of CA names to send to a client */ 275 calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir ); 276 if ( !calist ) { 277 Debug( LDAP_DEBUG_ANY, "TLS: " 278 "could not load client CA list (file:`%s',dir:`%s').\n", 279 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "", 280 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "", 281 0 ); 282 tlso_report_error(); 283 return -1; 284 } 285 286 SSL_CTX_set_client_CA_list( ctx, calist ); 287 } 288 } 289 290 if ( lo->ldo_tls_certfile && 291 !SSL_CTX_use_certificate_file( ctx, 292 lt->lt_certfile, SSL_FILETYPE_PEM ) ) 293 { 294 Debug( LDAP_DEBUG_ANY, 295 "TLS: could not use certificate `%s'.\n", 296 lo->ldo_tls_certfile,0,0); 297 tlso_report_error(); 298 return -1; 299 } 300 301 /* Key validity is checked automatically if cert has already been set */ 302 if ( lo->ldo_tls_keyfile && 303 !SSL_CTX_use_PrivateKey_file( ctx, 304 lt->lt_keyfile, SSL_FILETYPE_PEM ) ) 305 { 306 Debug( LDAP_DEBUG_ANY, 307 "TLS: could not use key file `%s'.\n", 308 lo->ldo_tls_keyfile,0,0); 309 tlso_report_error(); 310 return -1; 311 } 312 313 if ( lo->ldo_tls_dhfile ) { 314 DH *dh = NULL; 315 BIO *bio; 316 dhplist *p; 317 318 if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) { 319 Debug( LDAP_DEBUG_ANY, 320 "TLS: could not use DH parameters file `%s'.\n", 321 lo->ldo_tls_dhfile,0,0); 322 tlso_report_error(); 323 return -1; 324 } 325 while (( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) { 326 p = LDAP_MALLOC( sizeof(dhplist) ); 327 if ( p != NULL ) { 328 p->keylength = DH_size( dh ) * 8; 329 p->param = dh; 330 p->next = tlso_dhparams; 331 tlso_dhparams = p; 332 } 333 } 334 BIO_free( bio ); 335 } 336 337 if ( tlso_opt_trace ) { 338 SSL_CTX_set_info_callback( ctx, tlso_info_cb ); 339 } 340 341 i = SSL_VERIFY_NONE; 342 if ( lo->ldo_tls_require_cert ) { 343 i = SSL_VERIFY_PEER; 344 if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND || 345 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) { 346 i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT; 347 } 348 } 349 350 SSL_CTX_set_verify( ctx, i, 351 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ? 352 tlso_verify_ok : tlso_verify_cb ); 353 SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb ); 354 if ( lo->ldo_tls_dhfile ) { 355 SSL_CTX_set_tmp_dh_callback( ctx, tlso_tmp_dh_cb ); 356 } 357 #ifdef HAVE_OPENSSL_CRL 358 if ( lo->ldo_tls_crlcheck ) { 359 X509_STORE *x509_s = SSL_CTX_get_cert_store( ctx ); 360 if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) { 361 X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK ); 362 } else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) { 363 X509_STORE_set_flags( x509_s, 364 X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL ); 365 } 366 } 367 #endif 368 return 0; 369 } 370 371 static tls_session * 372 tlso_session_new( tls_ctx *ctx, int is_server ) 373 { 374 tlso_ctx *c = (tlso_ctx *)ctx; 375 return (tls_session *)SSL_new( c ); 376 } 377 378 static int 379 tlso_session_connect( LDAP *ld, tls_session *sess ) 380 { 381 tlso_session *s = (tlso_session *)sess; 382 383 /* Caller expects 0 = success, OpenSSL returns 1 = success */ 384 return SSL_connect( s ) - 1; 385 } 386 387 static int 388 tlso_session_accept( tls_session *sess ) 389 { 390 tlso_session *s = (tlso_session *)sess; 391 392 /* Caller expects 0 = success, OpenSSL returns 1 = success */ 393 return SSL_accept( s ) - 1; 394 } 395 396 static int 397 tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc ) 398 { 399 tlso_session *s = (tlso_session *)sess; 400 401 /* 1 was subtracted above, offset it back now */ 402 rc = SSL_get_error(s, rc+1); 403 if (rc == SSL_ERROR_WANT_READ) { 404 sb->sb_trans_needs_read = 1; 405 return 1; 406 407 } else if (rc == SSL_ERROR_WANT_WRITE) { 408 sb->sb_trans_needs_write = 1; 409 return 1; 410 411 } else if (rc == SSL_ERROR_WANT_CONNECT) { 412 return 1; 413 } 414 return 0; 415 } 416 417 static char * 418 tlso_session_errmsg( tls_session *sess, int rc, char *buf, size_t len ) 419 { 420 char err[256] = ""; 421 const char *certerr=NULL; 422 tlso_session *s = (tlso_session *)sess; 423 424 rc = ERR_peek_error(); 425 if ( rc ) { 426 ERR_error_string_n( rc, err, sizeof(err) ); 427 if ( ( ERR_GET_LIB(rc) == ERR_LIB_SSL ) && 428 ( ERR_GET_REASON(rc) == SSL_R_CERTIFICATE_VERIFY_FAILED ) ) { 429 int certrc = SSL_get_verify_result(s); 430 certerr = (char *)X509_verify_cert_error_string(certrc); 431 } 432 snprintf(buf, len, "%s%s%s%s", err, certerr ? " (" :"", 433 certerr ? certerr : "", certerr ? ")" : "" ); 434 return buf; 435 } 436 return NULL; 437 } 438 439 static int 440 tlso_session_my_dn( tls_session *sess, struct berval *der_dn ) 441 { 442 tlso_session *s = (tlso_session *)sess; 443 X509 *x; 444 X509_NAME *xn; 445 446 x = SSL_get_certificate( s ); 447 448 if (!x) return LDAP_INVALID_CREDENTIALS; 449 450 xn = X509_get_subject_name(x); 451 der_dn->bv_len = i2d_X509_NAME( xn, NULL ); 452 der_dn->bv_val = xn->bytes->data; 453 /* Don't X509_free, the session is still using it */ 454 return 0; 455 } 456 457 static X509 * 458 tlso_get_cert( SSL *s ) 459 { 460 /* If peer cert was bad, treat as if no cert was given */ 461 if (SSL_get_verify_result(s)) { 462 return NULL; 463 } 464 return SSL_get_peer_certificate(s); 465 } 466 467 static int 468 tlso_session_peer_dn( tls_session *sess, struct berval *der_dn ) 469 { 470 tlso_session *s = (tlso_session *)sess; 471 X509 *x = tlso_get_cert( s ); 472 X509_NAME *xn; 473 474 if ( !x ) 475 return LDAP_INVALID_CREDENTIALS; 476 477 xn = X509_get_subject_name(x); 478 der_dn->bv_len = i2d_X509_NAME( xn, NULL ); 479 der_dn->bv_val = xn->bytes->data; 480 X509_free(x); 481 return 0; 482 } 483 484 /* what kind of hostname were we given? */ 485 #define IS_DNS 0 486 #define IS_IP4 1 487 #define IS_IP6 2 488 489 static int 490 tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in ) 491 { 492 tlso_session *s = (tlso_session *)sess; 493 int i, ret = LDAP_LOCAL_ERROR; 494 X509 *x; 495 const char *name; 496 char *ptr; 497 int ntype = IS_DNS, nlen; 498 #ifdef LDAP_PF_INET6 499 struct in6_addr addr; 500 #else 501 struct in_addr addr; 502 #endif 503 504 if( ldap_int_hostname && 505 ( !name_in || !strcasecmp( name_in, "localhost" ) ) ) 506 { 507 name = ldap_int_hostname; 508 } else { 509 name = name_in; 510 } 511 nlen = strlen(name); 512 513 x = tlso_get_cert(s); 514 if (!x) { 515 Debug( LDAP_DEBUG_ANY, 516 "TLS: unable to get peer certificate.\n", 517 0, 0, 0 ); 518 /* If this was a fatal condition, things would have 519 * aborted long before now. 520 */ 521 return LDAP_SUCCESS; 522 } 523 524 #ifdef LDAP_PF_INET6 525 if (inet_pton(AF_INET6, name, &addr)) { 526 ntype = IS_IP6; 527 } else 528 #endif 529 if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) { 530 if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4; 531 } 532 533 i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1); 534 if (i >= 0) { 535 X509_EXTENSION *ex; 536 STACK_OF(GENERAL_NAME) *alt; 537 538 ex = X509_get_ext(x, i); 539 alt = X509V3_EXT_d2i(ex); 540 if (alt) { 541 int n, len2 = 0; 542 char *domain = NULL; 543 GENERAL_NAME *gn; 544 545 if (ntype == IS_DNS) { 546 domain = strchr(name, '.'); 547 if (domain) { 548 len2 = nlen - (domain-name); 549 } 550 } 551 n = sk_GENERAL_NAME_num(alt); 552 for (i=0; i<n; i++) { 553 char *sn; 554 int sl; 555 gn = sk_GENERAL_NAME_value(alt, i); 556 if (gn->type == GEN_DNS) { 557 if (ntype != IS_DNS) continue; 558 559 sn = (char *) ASN1_STRING_data(gn->d.ia5); 560 sl = ASN1_STRING_length(gn->d.ia5); 561 562 /* ignore empty */ 563 if (sl == 0) continue; 564 565 /* Is this an exact match? */ 566 if ((nlen == sl) && !strncasecmp(name, sn, nlen)) { 567 break; 568 } 569 570 /* Is this a wildcard match? */ 571 if (domain && (sn[0] == '*') && (sn[1] == '.') && 572 (len2 == sl-1) && !strncasecmp(domain, &sn[1], len2)) 573 { 574 break; 575 } 576 577 } else if (gn->type == GEN_IPADD) { 578 if (ntype == IS_DNS) continue; 579 580 sn = (char *) ASN1_STRING_data(gn->d.ia5); 581 sl = ASN1_STRING_length(gn->d.ia5); 582 583 #ifdef LDAP_PF_INET6 584 if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) { 585 continue; 586 } else 587 #endif 588 if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) { 589 continue; 590 } 591 if (!memcmp(sn, &addr, sl)) { 592 break; 593 } 594 } 595 } 596 597 GENERAL_NAMES_free(alt); 598 if (i < n) { /* Found a match */ 599 ret = LDAP_SUCCESS; 600 } 601 } 602 } 603 604 if (ret != LDAP_SUCCESS) { 605 X509_NAME *xn; 606 X509_NAME_ENTRY *ne; 607 ASN1_OBJECT *obj; 608 ASN1_STRING *cn = NULL; 609 int navas; 610 611 /* find the last CN */ 612 obj = OBJ_nid2obj( NID_commonName ); 613 if ( !obj ) goto no_cn; /* should never happen */ 614 615 xn = X509_get_subject_name(x); 616 navas = X509_NAME_entry_count( xn ); 617 for ( i=navas-1; i>=0; i-- ) { 618 ne = X509_NAME_get_entry( xn, i ); 619 if ( !OBJ_cmp( ne->object, obj )) { 620 cn = X509_NAME_ENTRY_get_data( ne ); 621 break; 622 } 623 } 624 625 if( !cn ) 626 { 627 no_cn: 628 Debug( LDAP_DEBUG_ANY, 629 "TLS: unable to get common name from peer certificate.\n", 630 0, 0, 0 ); 631 ret = LDAP_CONNECT_ERROR; 632 if ( ld->ld_error ) { 633 LDAP_FREE( ld->ld_error ); 634 } 635 ld->ld_error = LDAP_STRDUP( 636 _("TLS: unable to get CN from peer certificate")); 637 638 } else if ( cn->length == nlen && 639 strncasecmp( name, (char *) cn->data, nlen ) == 0 ) { 640 ret = LDAP_SUCCESS; 641 642 } else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) { 643 char *domain = strchr(name, '.'); 644 if( domain ) { 645 int dlen; 646 647 dlen = nlen - (domain-name); 648 649 /* Is this a wildcard match? */ 650 if ((dlen == cn->length-1) && 651 !strncasecmp(domain, (char *) &cn->data[1], dlen)) { 652 ret = LDAP_SUCCESS; 653 } 654 } 655 } 656 657 if( ret == LDAP_LOCAL_ERROR ) { 658 Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match " 659 "common name in certificate (%.*s).\n", 660 name, cn->length, cn->data ); 661 ret = LDAP_CONNECT_ERROR; 662 if ( ld->ld_error ) { 663 LDAP_FREE( ld->ld_error ); 664 } 665 ld->ld_error = LDAP_STRDUP( 666 _("TLS: hostname does not match CN in peer certificate")); 667 } 668 } 669 X509_free(x); 670 return ret; 671 } 672 673 static int 674 tlso_session_strength( tls_session *sess ) 675 { 676 tlso_session *s = (tlso_session *)sess; 677 678 return SSL_CIPHER_get_bits(SSL_get_current_cipher(s), NULL); 679 } 680 681 /* 682 * TLS support for LBER Sockbufs 683 */ 684 685 struct tls_data { 686 tlso_session *session; 687 Sockbuf_IO_Desc *sbiod; 688 }; 689 690 static int 691 tlso_bio_create( BIO *b ) { 692 b->init = 1; 693 b->num = 0; 694 b->ptr = NULL; 695 b->flags = 0; 696 return 1; 697 } 698 699 static int 700 tlso_bio_destroy( BIO *b ) 701 { 702 if ( b == NULL ) return 0; 703 704 b->ptr = NULL; /* sb_tls_remove() will free it */ 705 b->init = 0; 706 b->flags = 0; 707 return 1; 708 } 709 710 static int 711 tlso_bio_read( BIO *b, char *buf, int len ) 712 { 713 struct tls_data *p; 714 int ret; 715 716 if ( buf == NULL || len <= 0 ) return 0; 717 718 p = (struct tls_data *)b->ptr; 719 720 if ( p == NULL || p->sbiod == NULL ) { 721 return 0; 722 } 723 724 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len ); 725 726 BIO_clear_retry_flags( b ); 727 if ( ret < 0 ) { 728 int err = sock_errno(); 729 if ( err == EAGAIN || err == EWOULDBLOCK ) { 730 BIO_set_retry_read( b ); 731 } 732 } 733 734 return ret; 735 } 736 737 static int 738 tlso_bio_write( BIO *b, const char *buf, int len ) 739 { 740 struct tls_data *p; 741 int ret; 742 743 if ( buf == NULL || len <= 0 ) return 0; 744 745 p = (struct tls_data *)b->ptr; 746 747 if ( p == NULL || p->sbiod == NULL ) { 748 return 0; 749 } 750 751 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len ); 752 753 BIO_clear_retry_flags( b ); 754 if ( ret < 0 ) { 755 int err = sock_errno(); 756 if ( err == EAGAIN || err == EWOULDBLOCK ) { 757 BIO_set_retry_write( b ); 758 } 759 } 760 761 return ret; 762 } 763 764 static long 765 tlso_bio_ctrl( BIO *b, int cmd, long num, void *ptr ) 766 { 767 if ( cmd == BIO_CTRL_FLUSH ) { 768 /* The OpenSSL library needs this */ 769 return 1; 770 } 771 return 0; 772 } 773 774 static int 775 tlso_bio_gets( BIO *b, char *buf, int len ) 776 { 777 return -1; 778 } 779 780 static int 781 tlso_bio_puts( BIO *b, const char *str ) 782 { 783 return tlso_bio_write( b, str, strlen( str ) ); 784 } 785 786 static BIO_METHOD tlso_bio_method = 787 { 788 ( 100 | 0x400 ), /* it's a source/sink BIO */ 789 "sockbuf glue", 790 tlso_bio_write, 791 tlso_bio_read, 792 tlso_bio_puts, 793 tlso_bio_gets, 794 tlso_bio_ctrl, 795 tlso_bio_create, 796 tlso_bio_destroy 797 }; 798 799 static int 800 tlso_sb_setup( Sockbuf_IO_Desc *sbiod, void *arg ) 801 { 802 struct tls_data *p; 803 BIO *bio; 804 805 assert( sbiod != NULL ); 806 807 p = LBER_MALLOC( sizeof( *p ) ); 808 if ( p == NULL ) { 809 return -1; 810 } 811 812 p->session = arg; 813 p->sbiod = sbiod; 814 bio = BIO_new( &tlso_bio_method ); 815 bio->ptr = (void *)p; 816 SSL_set_bio( p->session, bio, bio ); 817 sbiod->sbiod_pvt = p; 818 return 0; 819 } 820 821 static int 822 tlso_sb_remove( Sockbuf_IO_Desc *sbiod ) 823 { 824 struct tls_data *p; 825 826 assert( sbiod != NULL ); 827 assert( sbiod->sbiod_pvt != NULL ); 828 829 p = (struct tls_data *)sbiod->sbiod_pvt; 830 SSL_free( p->session ); 831 LBER_FREE( sbiod->sbiod_pvt ); 832 sbiod->sbiod_pvt = NULL; 833 return 0; 834 } 835 836 static int 837 tlso_sb_close( Sockbuf_IO_Desc *sbiod ) 838 { 839 struct tls_data *p; 840 841 assert( sbiod != NULL ); 842 assert( sbiod->sbiod_pvt != NULL ); 843 844 p = (struct tls_data *)sbiod->sbiod_pvt; 845 SSL_shutdown( p->session ); 846 return 0; 847 } 848 849 static int 850 tlso_sb_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg ) 851 { 852 struct tls_data *p; 853 854 assert( sbiod != NULL ); 855 assert( sbiod->sbiod_pvt != NULL ); 856 857 p = (struct tls_data *)sbiod->sbiod_pvt; 858 859 if ( opt == LBER_SB_OPT_GET_SSL ) { 860 *((tlso_session **)arg) = p->session; 861 return 1; 862 863 } else if ( opt == LBER_SB_OPT_DATA_READY ) { 864 if( SSL_pending( p->session ) > 0 ) { 865 return 1; 866 } 867 } 868 869 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg ); 870 } 871 872 static ber_slen_t 873 tlso_sb_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len) 874 { 875 struct tls_data *p; 876 ber_slen_t ret; 877 int err; 878 879 assert( sbiod != NULL ); 880 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) ); 881 882 p = (struct tls_data *)sbiod->sbiod_pvt; 883 884 ret = SSL_read( p->session, (char *)buf, len ); 885 #ifdef HAVE_WINSOCK 886 errno = WSAGetLastError(); 887 #endif 888 err = SSL_get_error( p->session, ret ); 889 if (err == SSL_ERROR_WANT_READ ) { 890 sbiod->sbiod_sb->sb_trans_needs_read = 1; 891 sock_errset(EWOULDBLOCK); 892 } 893 else 894 sbiod->sbiod_sb->sb_trans_needs_read = 0; 895 return ret; 896 } 897 898 static ber_slen_t 899 tlso_sb_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len) 900 { 901 struct tls_data *p; 902 ber_slen_t ret; 903 int err; 904 905 assert( sbiod != NULL ); 906 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) ); 907 908 p = (struct tls_data *)sbiod->sbiod_pvt; 909 910 ret = SSL_write( p->session, (char *)buf, len ); 911 #ifdef HAVE_WINSOCK 912 errno = WSAGetLastError(); 913 #endif 914 err = SSL_get_error( p->session, ret ); 915 if (err == SSL_ERROR_WANT_WRITE ) { 916 sbiod->sbiod_sb->sb_trans_needs_write = 1; 917 sock_errset(EWOULDBLOCK); 918 919 } else { 920 sbiod->sbiod_sb->sb_trans_needs_write = 0; 921 } 922 return ret; 923 } 924 925 static Sockbuf_IO tlso_sbio = 926 { 927 tlso_sb_setup, /* sbi_setup */ 928 tlso_sb_remove, /* sbi_remove */ 929 tlso_sb_ctrl, /* sbi_ctrl */ 930 tlso_sb_read, /* sbi_read */ 931 tlso_sb_write, /* sbi_write */ 932 tlso_sb_close /* sbi_close */ 933 }; 934 935 /* Derived from openssl/apps/s_cb.c */ 936 static void 937 tlso_info_cb( const SSL *ssl, int where, int ret ) 938 { 939 int w; 940 char *op; 941 char *state = (char *) SSL_state_string_long( (SSL *)ssl ); 942 943 w = where & ~SSL_ST_MASK; 944 if ( w & SSL_ST_CONNECT ) { 945 op = "SSL_connect"; 946 } else if ( w & SSL_ST_ACCEPT ) { 947 op = "SSL_accept"; 948 } else { 949 op = "undefined"; 950 } 951 952 #ifdef HAVE_EBCDIC 953 if ( state ) { 954 state = LDAP_STRDUP( state ); 955 __etoa( state ); 956 } 957 #endif 958 if ( where & SSL_CB_LOOP ) { 959 Debug( LDAP_DEBUG_TRACE, 960 "TLS trace: %s:%s\n", 961 op, state, 0 ); 962 963 } else if ( where & SSL_CB_ALERT ) { 964 char *atype = (char *) SSL_alert_type_string_long( ret ); 965 char *adesc = (char *) SSL_alert_desc_string_long( ret ); 966 op = ( where & SSL_CB_READ ) ? "read" : "write"; 967 #ifdef HAVE_EBCDIC 968 if ( atype ) { 969 atype = LDAP_STRDUP( atype ); 970 __etoa( atype ); 971 } 972 if ( adesc ) { 973 adesc = LDAP_STRDUP( adesc ); 974 __etoa( adesc ); 975 } 976 #endif 977 Debug( LDAP_DEBUG_TRACE, 978 "TLS trace: SSL3 alert %s:%s:%s\n", 979 op, atype, adesc ); 980 #ifdef HAVE_EBCDIC 981 if ( atype ) LDAP_FREE( atype ); 982 if ( adesc ) LDAP_FREE( adesc ); 983 #endif 984 } else if ( where & SSL_CB_EXIT ) { 985 if ( ret == 0 ) { 986 Debug( LDAP_DEBUG_TRACE, 987 "TLS trace: %s:failed in %s\n", 988 op, state, 0 ); 989 } else if ( ret < 0 ) { 990 Debug( LDAP_DEBUG_TRACE, 991 "TLS trace: %s:error in %s\n", 992 op, state, 0 ); 993 } 994 } 995 #ifdef HAVE_EBCDIC 996 if ( state ) LDAP_FREE( state ); 997 #endif 998 } 999 1000 static int 1001 tlso_verify_cb( int ok, X509_STORE_CTX *ctx ) 1002 { 1003 X509 *cert; 1004 int errnum; 1005 int errdepth; 1006 X509_NAME *subject; 1007 X509_NAME *issuer; 1008 char *sname; 1009 char *iname; 1010 char *certerr = NULL; 1011 1012 cert = X509_STORE_CTX_get_current_cert( ctx ); 1013 errnum = X509_STORE_CTX_get_error( ctx ); 1014 errdepth = X509_STORE_CTX_get_error_depth( ctx ); 1015 1016 /* 1017 * X509_get_*_name return pointers to the internal copies of 1018 * those things requested. So do not free them. 1019 */ 1020 subject = X509_get_subject_name( cert ); 1021 issuer = X509_get_issuer_name( cert ); 1022 /* X509_NAME_oneline, if passed a NULL buf, allocate memomry */ 1023 sname = X509_NAME_oneline( subject, NULL, 0 ); 1024 iname = X509_NAME_oneline( issuer, NULL, 0 ); 1025 if ( !ok ) certerr = (char *)X509_verify_cert_error_string( errnum ); 1026 #ifdef HAVE_EBCDIC 1027 if ( sname ) __etoa( sname ); 1028 if ( iname ) __etoa( iname ); 1029 if ( certerr ) { 1030 certerr = LDAP_STRDUP( certerr ); 1031 __etoa( certerr ); 1032 } 1033 #endif 1034 Debug( LDAP_DEBUG_TRACE, 1035 "TLS certificate verification: depth: %d, err: %d, subject: %s,", 1036 errdepth, errnum, 1037 sname ? sname : "-unknown-" ); 1038 Debug( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-", 0, 0 ); 1039 if ( !ok ) { 1040 Debug( LDAP_DEBUG_ANY, 1041 "TLS certificate verification: Error, %s\n", 1042 certerr, 0, 0 ); 1043 } 1044 if ( sname ) 1045 CRYPTO_free ( sname ); 1046 if ( iname ) 1047 CRYPTO_free ( iname ); 1048 #ifdef HAVE_EBCDIC 1049 if ( certerr ) LDAP_FREE( certerr ); 1050 #endif 1051 return ok; 1052 } 1053 1054 static int 1055 tlso_verify_ok( int ok, X509_STORE_CTX *ctx ) 1056 { 1057 (void) tlso_verify_cb( ok, ctx ); 1058 return 1; 1059 } 1060 1061 /* Inspired by ERR_print_errors in OpenSSL */ 1062 static void 1063 tlso_report_error( void ) 1064 { 1065 unsigned long l; 1066 char buf[200]; 1067 const char *file; 1068 int line; 1069 1070 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) { 1071 ERR_error_string_n( l, buf, sizeof( buf ) ); 1072 #ifdef HAVE_EBCDIC 1073 if ( file ) { 1074 file = LDAP_STRDUP( file ); 1075 __etoa( (char *)file ); 1076 } 1077 __etoa( buf ); 1078 #endif 1079 Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n", 1080 buf, file, line ); 1081 #ifdef HAVE_EBCDIC 1082 if ( file ) LDAP_FREE( (void *)file ); 1083 #endif 1084 } 1085 } 1086 1087 static RSA * 1088 tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length ) 1089 { 1090 RSA *tmp_rsa; 1091 /* FIXME: Pregenerate the key on startup */ 1092 /* FIXME: Who frees the key? */ 1093 #if OPENSSL_VERSION_NUMBER >= 0x00908000 1094 BIGNUM *bn = BN_new(); 1095 tmp_rsa = NULL; 1096 if ( bn ) { 1097 if ( BN_set_word( bn, RSA_F4 )) { 1098 tmp_rsa = RSA_new(); 1099 if ( tmp_rsa && !RSA_generate_key_ex( tmp_rsa, key_length, bn, NULL )) { 1100 RSA_free( tmp_rsa ); 1101 tmp_rsa = NULL; 1102 } 1103 } 1104 BN_free( bn ); 1105 } 1106 #else 1107 tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL ); 1108 #endif 1109 1110 if ( !tmp_rsa ) { 1111 Debug( LDAP_DEBUG_ANY, 1112 "TLS: Failed to generate temporary %d-bit %s RSA key\n", 1113 key_length, is_export ? "export" : "domestic", 0 ); 1114 } 1115 return tmp_rsa; 1116 } 1117 1118 static int 1119 tlso_seed_PRNG( const char *randfile ) 1120 { 1121 #ifndef URANDOM_DEVICE 1122 /* no /dev/urandom (or equiv) */ 1123 long total=0; 1124 char buffer[MAXPATHLEN]; 1125 1126 if (randfile == NULL) { 1127 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd. 1128 * If $HOME is not set or buffer too small to hold the pathname, 1129 * an error occurs. - From RAND_file_name() man page. 1130 * The fact is that when $HOME is NULL, .rnd is used. 1131 */ 1132 randfile = RAND_file_name( buffer, sizeof( buffer ) ); 1133 1134 } else if (RAND_egd(randfile) > 0) { 1135 /* EGD socket */ 1136 return 0; 1137 } 1138 1139 if (randfile == NULL) { 1140 Debug( LDAP_DEBUG_ANY, 1141 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n", 1142 0, 0, 0); 1143 return -1; 1144 } 1145 1146 total = RAND_load_file(randfile, -1); 1147 1148 if (RAND_status() == 0) { 1149 Debug( LDAP_DEBUG_ANY, 1150 "TLS: PRNG not been seeded with enough data\n", 1151 0, 0, 0); 1152 return -1; 1153 } 1154 1155 /* assume if there was enough bits to seed that it's okay 1156 * to write derived bits to the file 1157 */ 1158 RAND_write_file(randfile); 1159 1160 #endif 1161 1162 return 0; 1163 } 1164 1165 struct dhinfo { 1166 int keylength; 1167 const char *pem; 1168 size_t size; 1169 }; 1170 1171 1172 /* From the OpenSSL 0.9.7 distro */ 1173 static const char tlso_dhpem512[] = 1174 "-----BEGIN DH PARAMETERS-----\n\ 1175 MEYCQQDaWDwW2YUiidDkr3VvTMqS3UvlM7gE+w/tlO+cikQD7VdGUNNpmdsp13Yn\n\ 1176 a6LT1BLiGPTdHghM9tgAPnxHdOgzAgEC\n\ 1177 -----END DH PARAMETERS-----\n"; 1178 1179 static const char tlso_dhpem1024[] = 1180 "-----BEGIN DH PARAMETERS-----\n\ 1181 MIGHAoGBAJf2QmHKtQXdKCjhPx1ottPb0PMTBH9A6FbaWMsTuKG/K3g6TG1Z1fkq\n\ 1182 /Gz/PWk/eLI9TzFgqVAuPvr3q14a1aZeVUMTgo2oO5/y2UHe6VaJ+trqCTat3xlx\n\ 1183 /mNbIK9HA2RgPC3gWfVLZQrY+gz3ASHHR5nXWHEyvpuZm7m3h+irAgEC\n\ 1184 -----END DH PARAMETERS-----\n"; 1185 1186 static const char tlso_dhpem2048[] = 1187 "-----BEGIN DH PARAMETERS-----\n\ 1188 MIIBCAKCAQEA7ZKJNYJFVcs7+6J2WmkEYb8h86tT0s0h2v94GRFS8Q7B4lW9aG9o\n\ 1189 AFO5Imov5Jo0H2XMWTKKvbHbSe3fpxJmw/0hBHAY8H/W91hRGXKCeyKpNBgdL8sh\n\ 1190 z22SrkO2qCnHJ6PLAMXy5fsKpFmFor2tRfCzrfnggTXu2YOzzK7q62bmqVdmufEo\n\ 1191 pT8igNcLpvZxk5uBDvhakObMym9mX3rAEBoe8PwttggMYiiw7NuJKO4MqD1llGkW\n\ 1192 aVM8U2ATsCun1IKHrRxynkE1/MJ86VHeYYX8GZt2YA8z+GuzylIOKcMH6JAWzMwA\n\ 1193 Gbatw6QwizOhr9iMjZ0B26TE3X8LvW84wwIBAg==\n\ 1194 -----END DH PARAMETERS-----\n"; 1195 1196 static const char tlso_dhpem4096[] = 1197 "-----BEGIN DH PARAMETERS-----\n\ 1198 MIICCAKCAgEA/urRnb6vkPYc/KEGXWnbCIOaKitq7ySIq9dTH7s+Ri59zs77zty7\n\ 1199 vfVlSe6VFTBWgYjD2XKUFmtqq6CqXMhVX5ElUDoYDpAyTH85xqNFLzFC7nKrff/H\n\ 1200 TFKNttp22cZE9V0IPpzedPfnQkE7aUdmF9JnDyv21Z/818O93u1B4r0szdnmEvEF\n\ 1201 bKuIxEHX+bp0ZR7RqE1AeifXGJX3d6tsd2PMAObxwwsv55RGkn50vHO4QxtTARr1\n\ 1202 rRUV5j3B3oPMgC7Offxx+98Xn45B1/G0Prp11anDsR1PGwtaCYipqsvMwQUSJtyE\n\ 1203 EOQWk+yFkeMe4vWv367eEi0Sd/wnC+TSXBE3pYvpYerJ8n1MceI5GQTdarJ77OW9\n\ 1204 bGTHmxRsLSCM1jpLdPja5jjb4siAa6EHc4qN9c/iFKS3PQPJEnX7pXKBRs5f7AF3\n\ 1205 W3RIGt+G9IVNZfXaS7Z/iCpgzgvKCs0VeqN38QsJGtC1aIkwOeyjPNy2G6jJ4yqH\n\ 1206 ovXYt/0mc00vCWeSNS1wren0pR2EiLxX0ypjjgsU1mk/Z3b/+zVf7fZSIB+nDLjb\n\ 1207 NPtUlJCVGnAeBK1J1nG3TQicqowOXoM6ISkdaXj5GPJdXHab2+S7cqhKGv5qC7rR\n\ 1208 jT6sx7RUr0CNTxzLI7muV2/a4tGmj0PSdXQdsZ7tw7gbXlaWT1+MM2MCAQI=\n\ 1209 -----END DH PARAMETERS-----\n"; 1210 1211 static const struct dhinfo tlso_dhpem[] = { 1212 { 512, tlso_dhpem512, sizeof(tlso_dhpem512) }, 1213 { 1024, tlso_dhpem1024, sizeof(tlso_dhpem1024) }, 1214 { 2048, tlso_dhpem2048, sizeof(tlso_dhpem2048) }, 1215 { 4096, tlso_dhpem4096, sizeof(tlso_dhpem4096) }, 1216 { 0, NULL, 0 } 1217 }; 1218 1219 static DH * 1220 tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length ) 1221 { 1222 struct dhplist *p = NULL; 1223 BIO *b = NULL; 1224 DH *dh = NULL; 1225 int i; 1226 1227 /* Do we have params of this length already? */ 1228 LDAP_MUTEX_LOCK( &tlso_dh_mutex ); 1229 for ( p = tlso_dhparams; p; p=p->next ) { 1230 if ( p->keylength == key_length ) { 1231 LDAP_MUTEX_UNLOCK( &tlso_dh_mutex ); 1232 return p->param; 1233 } 1234 } 1235 1236 /* No - check for hardcoded params */ 1237 1238 for (i=0; tlso_dhpem[i].keylength; i++) { 1239 if ( tlso_dhpem[i].keylength == key_length ) { 1240 b = BIO_new_mem_buf( (char *)tlso_dhpem[i].pem, tlso_dhpem[i].size ); 1241 break; 1242 } 1243 } 1244 1245 if ( b ) { 1246 dh = PEM_read_bio_DHparams( b, NULL, NULL, NULL ); 1247 BIO_free( b ); 1248 } 1249 1250 /* Generating on the fly is expensive/slow... */ 1251 if ( !dh ) { 1252 dh = DH_generate_parameters( key_length, DH_GENERATOR_2, NULL, NULL ); 1253 } 1254 if ( dh ) { 1255 p = LDAP_MALLOC( sizeof(struct dhplist) ); 1256 if ( p != NULL ) { 1257 p->keylength = key_length; 1258 p->param = dh; 1259 p->next = tlso_dhparams; 1260 tlso_dhparams = p; 1261 } 1262 } 1263 1264 LDAP_MUTEX_UNLOCK( &tlso_dh_mutex ); 1265 return dh; 1266 } 1267 1268 tls_impl ldap_int_tls_impl = { 1269 "OpenSSL", 1270 1271 tlso_init, 1272 tlso_destroy, 1273 1274 tlso_ctx_new, 1275 tlso_ctx_ref, 1276 tlso_ctx_free, 1277 tlso_ctx_init, 1278 1279 tlso_session_new, 1280 tlso_session_connect, 1281 tlso_session_accept, 1282 tlso_session_upflags, 1283 tlso_session_errmsg, 1284 tlso_session_my_dn, 1285 tlso_session_peer_dn, 1286 tlso_session_chkhost, 1287 tlso_session_strength, 1288 1289 &tlso_sbio, 1290 1291 #ifdef LDAP_R_COMPILE 1292 tlso_thr_init, 1293 #else 1294 NULL, 1295 #endif 1296 1297 0 1298 }; 1299 1300 #endif /* HAVE_OPENSSL */ 1301