3 * Copyright 1998-2000 The OpenLDAP Foundation, All Rights Reserved.
4 * COPYING RESTRICTIONS APPLY, see COPYRIGHT file
6 * tls.c - Handle tls/ssl using SSLeay or OpenSSL.
13 #include <ac/stdlib.h>
15 #include <ac/socket.h>
16 #include <ac/string.h>
18 #include <ac/unistd.h>
26 #include <ldap_pvt_thread.h>
29 #ifdef HAVE_OPENSSL_SSL_H
30 #include <openssl/ssl.h>
31 #include <openssl/x509v3.h>
32 #include <openssl/err.h>
33 #include <openssl/rand.h>
34 #elif defined( HAVE_SSL_H )
38 static int tls_opt_trace = 1;
39 static char *tls_opt_certfile = NULL;
40 static char *tls_opt_keyfile = NULL;
41 static char *tls_opt_cacertfile = NULL;
42 static char *tls_opt_cacertdir = NULL;
43 static int tls_opt_require_cert = 0;
44 static char *tls_opt_ciphersuite = NULL;
45 static char *tls_opt_randfile = NULL;
47 #define HAS_TLS( sb ) ber_sockbuf_ctrl( sb, LBER_SB_OPT_HAS_IO, \
48 (void *)&ldap_pvt_sockbuf_io_tls )
50 static void tls_report_error( void );
52 static void tls_info_cb( SSL *ssl, int where, int ret );
53 static int tls_verify_cb( int ok, X509_STORE_CTX *ctx );
54 static RSA * tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
55 static STACK_OF(X509_NAME) * get_ca_list( char * bundle, char * dir );
57 #if 0 /* Currently this is not used by anyone */
58 static DH * tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length );
61 static SSL_CTX *tls_def_ctx = NULL;
63 static int tls_seed_PRNG( const char *randfile );
67 * provide mutexes for the SSLeay library.
69 static ldap_pvt_thread_mutex_t tls_mutexes[CRYPTO_NUM_LOCKS];
71 static void tls_locking_cb( int mode, int type, const char *file, int line )
73 if ( mode & CRYPTO_LOCK ) {
74 ldap_pvt_thread_mutex_lock( &tls_mutexes[type] );
76 ldap_pvt_thread_mutex_unlock( &tls_mutexes[type] );
81 * an extra mutex for the default ctx.
84 static ldap_pvt_thread_mutex_t tls_def_ctx_mutex;
86 static void tls_init_threads( void )
90 for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
91 ldap_pvt_thread_mutex_init( &tls_mutexes[i] );
93 CRYPTO_set_locking_callback( tls_locking_cb );
94 /* FIXME: the thread id should be added somehow... */
96 ldap_pvt_thread_mutex_init( &tls_def_ctx_mutex );
98 #endif /* LDAP_R_COMPILE */
101 * Tear down the TLS subsystem. Should only be called once.
104 ldap_pvt_tls_destroy( void )
106 SSL_CTX_free(tls_def_ctx);
112 * Initialize TLS subsystem. Should be called only once.
115 ldap_pvt_tls_init( void )
117 static int tls_initialized = 0;
119 if ( tls_initialized ) return 0;
122 (void) tls_seed_PRNG( tls_opt_randfile );
124 #ifdef LDAP_R_COMPILE
128 SSL_load_error_strings();
129 SSLeay_add_ssl_algorithms();
131 /* FIXME: mod_ssl does this */
132 X509V3_add_standard_extensions();
137 * initialize the default context
140 ldap_pvt_tls_init_def_ctx( void )
142 STACK_OF(X509_NAME) *calist;
144 #ifdef LDAP_R_COMPILE
145 ldap_pvt_thread_mutex_lock( &tls_def_ctx_mutex );
147 if ( tls_def_ctx == NULL ) {
148 tls_def_ctx = SSL_CTX_new( SSLv23_method() );
149 if ( tls_def_ctx == NULL ) {
150 Debug( LDAP_DEBUG_ANY,
151 "TLS: could not allocate default ctx (%d).\n",
152 ERR_peek_error(),0,0);
155 if ( tls_opt_ciphersuite &&
156 !SSL_CTX_set_cipher_list( tls_def_ctx,
157 tls_opt_ciphersuite ) )
159 Debug( LDAP_DEBUG_ANY,
160 "TLS: could not set cipher list %s.\n",
161 tls_opt_ciphersuite, 0, 0 );
165 if (tls_opt_cacertfile != NULL || tls_opt_cacertdir != NULL) {
166 if ( !SSL_CTX_load_verify_locations( tls_def_ctx,
169 || !SSL_CTX_set_default_verify_paths( tls_def_ctx ) )
171 Debug( LDAP_DEBUG_ANY, "TLS: "
172 "could not load verify locations (file:`%s',dir:`%s').\n",
173 tls_opt_cacertfile ? tls_opt_cacertfile : "",
174 tls_opt_cacertdir ? tls_opt_cacertdir : "",
179 calist = get_ca_list( tls_opt_cacertfile, tls_opt_cacertdir );
181 Debug( LDAP_DEBUG_ANY, "TLS: "
182 "could not load client CA list (file:`%s',dir:`%s').\n",
183 tls_opt_cacertfile ? tls_opt_cacertfile : "",
184 tls_opt_cacertdir ? tls_opt_cacertdir : "",
189 SSL_CTX_set_client_CA_list( tls_def_ctx, calist );
191 if ( tls_opt_keyfile &&
192 !SSL_CTX_use_PrivateKey_file( tls_def_ctx,
196 Debug( LDAP_DEBUG_ANY,
197 "TLS: could not use key file `%s'.\n",
198 tls_opt_keyfile,0,0);
202 if ( tls_opt_certfile &&
203 !SSL_CTX_use_certificate_file( tls_def_ctx,
207 Debug( LDAP_DEBUG_ANY,
208 "TLS: could not use certificate `%s'.\n",
209 tls_opt_certfile,0,0);
213 if ( ( tls_opt_certfile || tls_opt_keyfile ) &&
214 !SSL_CTX_check_private_key( tls_def_ctx ) )
216 Debug( LDAP_DEBUG_ANY,
217 "TLS: private key mismatch.\n",
222 if ( tls_opt_trace ) {
223 SSL_CTX_set_info_callback( tls_def_ctx, tls_info_cb );
225 SSL_CTX_set_verify( tls_def_ctx,
226 tls_opt_require_cert ?
227 (SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT) :
230 SSL_CTX_set_tmp_rsa_callback( tls_def_ctx, tls_tmp_rsa_cb );
231 /* SSL_CTX_set_tmp_dh_callback( tls_def_ctx, tls_tmp_dh_cb ); */
233 #ifdef LDAP_R_COMPILE
234 ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
238 if ( tls_def_ctx != NULL ) {
239 SSL_CTX_free( tls_def_ctx );
242 #ifdef LDAP_R_COMPILE
243 ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
248 static STACK_OF(X509_NAME) *
249 get_ca_list( char * bundle, char * dir )
251 STACK_OF(X509_NAME) *ca_list = NULL;
254 ca_list = SSL_load_client_CA_file( bundle );
257 * FIXME: We have now to go over all files in dir, load them
258 * and add every certificate there to ca_list.
264 alloc_handle( void *ctx_arg )
270 ctx = (SSL_CTX *) ctx_arg;
272 if ( ldap_pvt_tls_init_def_ctx() < 0 ) return NULL;
276 ssl = SSL_new( ctx );
278 Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
285 update_flags( Sockbuf *sb, SSL * ssl, int rc )
287 int err = SSL_get_error(ssl, rc);
289 sb->sb_trans_needs_read = 0;
290 sb->sb_trans_needs_write = 0;
291 if (err == SSL_ERROR_WANT_READ)
293 sb->sb_trans_needs_read = 1;
295 } else if (err == SSL_ERROR_WANT_WRITE)
297 sb->sb_trans_needs_write = 1;
299 } else if (err == SSL_ERROR_WANT_CONNECT)
307 * TLS support for LBER Sockbufs
312 Sockbuf_IO_Desc *sbiod;
315 extern BIO_METHOD ldap_pvt_sb_bio_method;
318 sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg )
323 assert( sbiod != NULL );
325 p = LBER_MALLOC( sizeof( *p ) );
331 bio = BIO_new( &ldap_pvt_sb_bio_method );
332 bio->ptr = (void *)p;
333 SSL_set_bio( p->ssl, bio, bio );
334 sbiod->sbiod_pvt = p;
339 sb_tls_remove( Sockbuf_IO_Desc *sbiod )
343 assert( sbiod != NULL );
344 assert( sbiod->sbiod_pvt != NULL );
346 p = (struct tls_data *)sbiod->sbiod_pvt;
348 LBER_FREE( sbiod->sbiod_pvt );
349 sbiod->sbiod_pvt = NULL;
354 sb_tls_close( Sockbuf_IO_Desc *sbiod )
358 assert( sbiod != NULL );
359 assert( sbiod->sbiod_pvt != NULL );
361 p = (struct tls_data *)sbiod->sbiod_pvt;
362 SSL_shutdown( p->ssl );
367 sb_tls_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
371 assert( sbiod != NULL );
372 assert( sbiod->sbiod_pvt != NULL );
374 p = (struct tls_data *)sbiod->sbiod_pvt;
376 if ( opt == LBER_SB_OPT_GET_SSL ) {
377 *((SSL **)arg) = p->ssl;
380 } else if ( opt == LBER_SB_OPT_DATA_READY ) {
381 if( SSL_pending( p->ssl ) > 0 ) {
386 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
390 sb_tls_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
396 assert( sbiod != NULL );
397 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
399 p = (struct tls_data *)sbiod->sbiod_pvt;
401 ret = SSL_read( p->ssl, (char *)buf, len );
403 errno = WSAGetLastError();
405 err = SSL_get_error( p->ssl, ret );
406 if (err == SSL_ERROR_WANT_READ ) {
407 sbiod->sbiod_sb->sb_trans_needs_read = 1;
413 sbiod->sbiod_sb->sb_trans_needs_read = 0;
418 sb_tls_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
424 assert( sbiod != NULL );
425 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
427 p = (struct tls_data *)sbiod->sbiod_pvt;
429 ret = SSL_write( p->ssl, (char *)buf, len );
431 errno = WSAGetLastError();
433 err = SSL_get_error( p->ssl, ret );
434 if (err == SSL_ERROR_WANT_WRITE ) {
435 sbiod->sbiod_sb->sb_trans_needs_write = 1;
441 sbiod->sbiod_sb->sb_trans_needs_write = 0;
445 Sockbuf_IO ldap_pvt_sockbuf_io_tls =
447 sb_tls_setup, /* sbi_setup */
448 sb_tls_remove, /* sbi_remove */
449 sb_tls_ctrl, /* sbi_ctrl */
450 sb_tls_read, /* sbi_read */
451 sb_tls_write, /* sbi_write */
452 sb_tls_close /* sbi_close */
456 sb_tls_bio_create( BIO *b ) {
465 sb_tls_bio_destroy( BIO *b )
470 b->ptr = NULL; /* sb_tls_remove() will free it */
477 sb_tls_bio_read( BIO *b, char *buf, int len )
482 if ( buf == NULL || len <= 0 )
485 p = (struct tls_data *)b->ptr;
487 if ( p == NULL || p->sbiod == NULL )
490 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
492 BIO_clear_retry_flags( b );
493 if ( ret < 0 && errno == EWOULDBLOCK )
494 BIO_set_retry_read( b );
500 sb_tls_bio_write( BIO *b, const char *buf, int len )
505 if ( buf == NULL || len <= 0 )
508 p = (struct tls_data *)b->ptr;
510 if ( p == NULL || p->sbiod == NULL )
513 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
515 BIO_clear_retry_flags( b );
516 if ( ret < 0 && errno == EWOULDBLOCK )
517 BIO_set_retry_write( b );
523 sb_tls_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
525 if ( cmd == BIO_CTRL_FLUSH ) {
526 /* The OpenSSL library needs this */
533 sb_tls_bio_gets( BIO *b, char *buf, int len )
539 sb_tls_bio_puts( BIO *b, const char *str )
541 return sb_tls_bio_write( b, str, strlen( str ) );
544 BIO_METHOD ldap_pvt_sb_bio_method =
546 ( 100 | 0x400 ), /* it's a source/sink BIO */
558 * Call this to do a TLS connect on a sockbuf. ctx_arg can be
559 * a SSL_CTX * or NULL, in which case the default ctx is used.
563 * 0 - Success. Connection is ready for communication.
564 * <0 - Error. Can't create a TLS stream.
565 * >0 - Partial success.
566 * Do a select (using information from lber_pvt_sb_needs_{read,write}
571 ldap_int_tls_connect( LDAP *ld, LDAPConn *conn )
573 Sockbuf *sb = conn->lconn_sb;
577 if ( HAS_TLS( sb ) ) {
578 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
581 void *ctx = ld->ld_defconn
582 ? ld->ld_defconn->lconn_tls_ctx : NULL;
584 ssl = alloc_handle( ctx );
586 if ( ssl == NULL ) return -1;
589 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
590 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
592 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
593 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
596 conn->lconn_tls_ctx = tls_def_ctx;
600 err = SSL_connect( ssl );
603 errno = WSAGetLastError();
606 if ( update_flags( sb, ssl, err )) {
609 if ((err = ERR_peek_error())) {
611 ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf));
613 Debug( LDAP_DEBUG_ANY,"TLS: can't connect.\n",0,0,0);
614 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
615 LBER_SBIOD_LEVEL_TRANSPORT );
617 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
618 LBER_SBIOD_LEVEL_TRANSPORT );
627 * Call this to do a TLS accept on a sockbuf.
628 * Everything else is the same as with tls_connect.
631 ldap_pvt_tls_accept( Sockbuf *sb, void *ctx_arg )
636 if ( HAS_TLS( sb ) ) {
637 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
639 ssl = alloc_handle( ctx_arg );
643 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
644 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
646 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
647 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
650 err = SSL_accept( ssl );
653 errno = WSAGetLastError();
656 if ( update_flags( sb, ssl, err ))
658 Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 );
660 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
661 LBER_SBIOD_LEVEL_TRANSPORT );
663 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
664 LBER_SBIOD_LEVEL_TRANSPORT );
673 ldap_pvt_tls_inplace ( Sockbuf *sb )
681 ldap_pvt_tls_sb_ctx( Sockbuf *sb )
686 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p );
694 ldap_pvt_tls_get_strength( void *s )
698 c = SSL_get_current_cipher((SSL *)s);
699 return SSL_CIPHER_get_bits(c, NULL);
704 ldap_pvt_tls_get_peer( void *s )
710 x = SSL_get_peer_certificate((SSL *)s);
715 xn = X509_get_subject_name(x);
716 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
722 ldap_pvt_tls_get_peer_dn( void *s )
726 char buf[2048], *p, *dn;
728 x = SSL_get_peer_certificate((SSL *)s);
732 xn = X509_get_subject_name(x);
733 p = X509_NAME_oneline(xn, buf, sizeof(buf));
735 dn = ldap_dcedn2dn( p );
742 ldap_pvt_tls_get_peer_hostname( void *s )
749 x = SSL_get_peer_certificate((SSL *)s);
754 xn = X509_get_subject_name(x);
756 ret = X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf));
762 p = LDAP_STRDUP(buf);
768 ldap_pvt_tls_check_hostname( void *s, char *name )
770 int i, ret = LDAP_LOCAL_ERROR;
773 x = SSL_get_peer_certificate((SSL *)s);
776 Debug( LDAP_DEBUG_ANY,
777 "TLS: unable to get peer certificate.\n",
782 i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
786 STACK_OF(GENERAL_NAME) *alt;
788 ex = X509_get_ext(x, i);
789 alt = X509V3_EXT_d2i(ex);
795 X509V3_EXT_METHOD *method;
798 n = sk_GENERAL_NAME_num(alt);
799 domain = strchr(name, '.');
801 len2 = len1 - (domain-name);
804 gn = sk_GENERAL_NAME_value(alt, i);
805 if (gn->type == GEN_DNS)
807 char *sn = ASN1_STRING_data(gn->d.ia5);
808 int sl = ASN1_STRING_length(gn->d.ia5);
810 /* Is this an exact match? */
811 if ((len1 == sl) && !strncasecmp(name, sn, len1))
814 /* Is this a wildcard match? */
815 if ((*sn == '*') && domain && (len2 == sl-1) &&
816 !strncasecmp(domain, sn+1, len2))
820 method = X509V3_EXT_get(ex);
821 method->ext_free(alt);
822 if (i < n) /* Found a match */
827 if (ret != LDAP_SUCCESS)
832 xn = X509_get_subject_name(x);
834 if (X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf))
837 Debug( LDAP_DEBUG_ANY,
838 "TLS: unable to get common name from peer certificate.\n",
840 } else if (strcasecmp(name, buf))
842 Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
843 "common name in certificate (%s).\n",
845 ret = LDAP_CONNECT_ERROR;
856 ldap_pvt_tls_get_peer_issuer( void *s )
858 #if 0 /* currently unused; see ldap_pvt_tls_get_peer() if needed */
863 x = SSL_get_peer_certificate((SSL *)s);
868 xn = X509_get_issuer_name(x);
869 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
878 ldap_int_tls_config( LDAP *ld, int option, const char *arg )
883 case LDAP_OPT_X_TLS_CACERTFILE:
884 case LDAP_OPT_X_TLS_CACERTDIR:
885 case LDAP_OPT_X_TLS_CERTFILE:
886 case LDAP_OPT_X_TLS_KEYFILE:
887 case LDAP_OPT_X_TLS_RANDOM_FILE:
888 return ldap_pvt_tls_set_option( ld, option, (void *) arg );
890 case LDAP_OPT_X_TLS_REQUIRE_CERT:
891 i = ( ( strcasecmp( arg, "on" ) == 0 ) ||
892 ( strcasecmp( arg, "yes" ) == 0) ||
893 ( strcasecmp( arg, "true" ) == 0 ) );
894 return ldap_pvt_tls_set_option( ld, option, (void *) &i );
898 if ( strcasecmp( arg, "never" ) == 0 )
899 i = LDAP_OPT_X_TLS_NEVER ;
900 if ( strcasecmp( arg, "demand" ) == 0 )
901 i = LDAP_OPT_X_TLS_DEMAND ;
902 if ( strcasecmp( arg, "allow" ) == 0 )
903 i = LDAP_OPT_X_TLS_ALLOW ;
904 if ( strcasecmp( arg, "try" ) == 0 )
905 i = LDAP_OPT_X_TLS_TRY ;
906 if ( strcasecmp( arg, "hard" ) == 0 )
907 i = LDAP_OPT_X_TLS_HARD ;
910 return ldap_pvt_tls_set_option( ld, option, &i );
919 ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg )
921 struct ldapoptions *lo;
924 assert( LDAP_VALID( ld ) );
926 if( !LDAP_VALID( ld ) ) {
927 return LDAP_OPT_ERROR;
930 lo = &ld->ld_options;
933 /* Get pointer to global option structure */
934 lo = LDAP_INT_GLOBAL_OPT();
936 return LDAP_NO_MEMORY;
942 *(int *)arg = lo->ldo_tls_mode;
944 case LDAP_OPT_X_TLS_CTX:
946 *(void **)arg = (void *) tls_def_ctx;
948 *(void **)arg = ld->ld_defconn->lconn_tls_ctx;
950 case LDAP_OPT_X_TLS_CACERTFILE:
951 *(char **)arg = tls_opt_cacertfile ?
952 LDAP_STRDUP( tls_opt_cacertfile ) : NULL;
954 case LDAP_OPT_X_TLS_CACERTDIR:
955 *(char **)arg = tls_opt_cacertdir ?
956 LDAP_STRDUP( tls_opt_cacertdir ) : NULL;
958 case LDAP_OPT_X_TLS_CERTFILE:
959 *(char **)arg = tls_opt_certfile ?
960 LDAP_STRDUP( tls_opt_certfile ) : NULL;
962 case LDAP_OPT_X_TLS_KEYFILE:
963 *(char **)arg = tls_opt_keyfile ?
964 LDAP_STRDUP( tls_opt_keyfile ) : NULL;
966 case LDAP_OPT_X_TLS_REQUIRE_CERT:
967 *(int *)arg = tls_opt_require_cert;
969 case LDAP_OPT_X_TLS_RANDOM_FILE:
970 *(char **)arg = tls_opt_randfile;
979 ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
981 struct ldapoptions *lo;
984 assert( LDAP_VALID( ld ) );
986 if( !LDAP_VALID( ld ) ) {
987 return LDAP_OPT_ERROR;
990 lo = &ld->ld_options;
993 /* Get pointer to global option structure */
994 lo = LDAP_INT_GLOBAL_OPT();
996 return LDAP_NO_MEMORY;
1001 case LDAP_OPT_X_TLS:
1002 switch( *(int *) arg ) {
1003 case LDAP_OPT_X_TLS_NEVER:
1004 case LDAP_OPT_X_TLS_DEMAND:
1005 case LDAP_OPT_X_TLS_ALLOW:
1006 case LDAP_OPT_X_TLS_TRY:
1007 case LDAP_OPT_X_TLS_HARD:
1009 lo->ldo_tls_mode = *(int *)arg;
1016 case LDAP_OPT_X_TLS_CTX:
1018 tls_def_ctx = (SSL_CTX *) arg;
1021 ld->ld_defconn->lconn_tls_ctx = arg;
1031 case LDAP_OPT_X_TLS_CACERTFILE:
1032 if ( tls_opt_cacertfile ) LDAP_FREE( tls_opt_cacertfile );
1033 tls_opt_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1035 case LDAP_OPT_X_TLS_CACERTDIR:
1036 if ( tls_opt_cacertdir ) LDAP_FREE( tls_opt_cacertdir );
1037 tls_opt_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1039 case LDAP_OPT_X_TLS_CERTFILE:
1040 if ( tls_opt_certfile ) LDAP_FREE( tls_opt_certfile );
1041 tls_opt_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1043 case LDAP_OPT_X_TLS_KEYFILE:
1044 if ( tls_opt_keyfile ) LDAP_FREE( tls_opt_keyfile );
1045 tls_opt_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1047 case LDAP_OPT_X_TLS_REQUIRE_CERT:
1048 tls_opt_require_cert = * (int *) arg;
1050 case LDAP_OPT_X_TLS_CIPHER_SUITE:
1051 if ( tls_opt_ciphersuite ) LDAP_FREE( tls_opt_ciphersuite );
1052 tls_opt_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1054 case LDAP_OPT_X_TLS_RANDOM_FILE:
1055 if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile );
1056 tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1065 ldap_int_tls_start ( LDAP *ld, LDAPConn *conn, LDAPURLDesc *srv )
1067 Sockbuf *sb = conn->lconn_sb;
1072 host = srv->lud_host;
1074 host = conn->lconn_server->lud_host;
1077 /* avoid NULL host */
1078 if( host == NULL ) host = "localhost";
1080 (void) ldap_pvt_tls_init();
1083 * Fortunately, the lib uses blocking io...
1085 if ( ldap_int_tls_connect( ld, conn ) < 0 ) {
1086 ld->ld_errno = LDAP_CONNECT_ERROR;
1087 return (ld->ld_errno);
1090 ssl = (void *) ldap_pvt_tls_sb_ctx( sb );
1091 assert( ssl != NULL );
1094 * compare host with name(s) in certificate
1096 ld->ld_errno = ldap_pvt_tls_check_hostname( ssl, host );
1097 if (ld->ld_errno != LDAP_SUCCESS) {
1098 return ld->ld_errno;
1102 * set SASL properties to TLS ssf and authid
1108 /* we need to let SASL know */
1109 ssf = ldap_pvt_tls_get_strength( ssl );
1110 authid = ldap_pvt_tls_get_peer( ssl );
1112 (void) ldap_int_sasl_external( ld, conn, authid, ssf );
1115 return LDAP_SUCCESS;
1118 /* Derived from openssl/apps/s_cb.c */
1120 tls_info_cb( SSL *ssl, int where, int ret )
1125 w = where & ~SSL_ST_MASK;
1126 if ( w & SSL_ST_CONNECT ) {
1128 } else if ( w & SSL_ST_ACCEPT ) {
1134 if ( where & SSL_CB_LOOP ) {
1135 Debug( LDAP_DEBUG_TRACE,
1136 "TLS trace: %s:%s\n",
1137 op, SSL_state_string_long( ssl ), 0 );
1138 } else if ( where & SSL_CB_ALERT ) {
1139 op = ( where & SSL_CB_READ ) ? "read" : "write";
1140 Debug( LDAP_DEBUG_TRACE,
1141 "TLS trace: SSL3 alert %s:%s:%s\n",
1143 SSL_alert_type_string_long( ret ),
1144 SSL_alert_desc_string_long( ret) );
1145 } else if ( where & SSL_CB_EXIT ) {
1147 Debug( LDAP_DEBUG_TRACE,
1148 "TLS trace: %s:failed in %s\n",
1149 op, SSL_state_string_long( ssl ), 0 );
1150 } else if ( ret < 0 ) {
1151 Debug( LDAP_DEBUG_TRACE,
1152 "TLS trace: %s:error in %s\n",
1153 op, SSL_state_string_long( ssl ), 0 );
1159 tls_verify_cb( int ok, X509_STORE_CTX *ctx )
1169 cert = X509_STORE_CTX_get_current_cert( ctx );
1170 errnum = X509_STORE_CTX_get_error( ctx );
1171 errdepth = X509_STORE_CTX_get_error_depth( ctx );
1174 * X509_get_*_name return pointers to the internal copies of
1175 * those things requested. So do not free them.
1177 subject = X509_get_subject_name( cert );
1178 issuer = X509_get_issuer_name( cert );
1179 /* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
1180 sname = X509_NAME_oneline( subject, NULL, 0 );
1181 iname = X509_NAME_oneline( issuer, NULL, 0 );
1182 Debug( LDAP_DEBUG_TRACE,
1183 "TLS certificate verification: depth: %d, subject: %s, issuer: %s\n",
1185 sname ? sname : "-unknown-",
1186 iname ? iname : "-unknown-" );
1188 CRYPTO_free ( sname );
1190 CRYPTO_free ( iname );
1195 /* Inspired by ERR_print_errors in OpenSSL */
1197 tls_report_error( void )
1204 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
1205 Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
1206 ERR_error_string( l, buf ), file, line );
1211 tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
1215 /* FIXME: Pregenerate the key on startup */
1216 /* FIXME: Who frees the key? */
1217 tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
1220 Debug( LDAP_DEBUG_ANY,
1221 "TLS: Failed to generate temporary %d-bit %s RSA key\n",
1222 key_length, is_export ? "export" : "domestic", 0 );
1229 tls_seed_PRNG( const char *randfile )
1231 #ifndef URANDOM_DEVICE
1232 /* no /dev/urandom (or equiv) */
1234 char buffer[MAXPATHLEN];
1236 if (randfile == NULL) {
1237 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
1238 * If $HOME is not set or buffer too small to hold the pathname,
1239 * an error occurs. - From RAND_file_name() man page.
1240 * The fact is that when $HOME is NULL, .rnd is used.
1242 randfile = RAND_file_name( buffer, sizeof( buffer ) );
1244 } else if (RAND_egd(randfile) > 0) {
1249 if (randfile == NULL) {
1250 Debug( LDAP_DEBUG_ANY,
1251 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
1256 total = RAND_load_file(randfile, -1);
1258 if (RAND_status() == 0) {
1259 Debug( LDAP_DEBUG_ANY,
1260 "TLS: PRNG not been seeded with enough data\n",
1265 /* assume if there was enough bits to seed that it's okay
1266 * to write derived bits to the file
1268 RAND_write_file(randfile);
1277 tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
1285 ldap_start_tls_s ( LDAP *ld,
1286 LDAPControl **serverctrls,
1287 LDAPControl **clientctrls )
1292 char *rspoid = NULL;
1293 struct berval *rspdata = NULL;
1295 /* XXYYZ: this initiates operation only on default connection! */
1297 if ( ldap_pvt_tls_inplace( ld->ld_sb ) != 0 ) {
1298 return LDAP_LOCAL_ERROR;
1301 rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS,
1302 NULL, serverctrls, clientctrls, &rspoid, &rspdata );
1303 if ( rc != LDAP_SUCCESS ) {
1307 if ( rspoid != NULL ) {
1311 if ( rspdata != NULL ) {
1312 ber_bvfree( rspdata );
1315 rc = ldap_int_tls_start( ld, ld->ld_defconn, NULL );
1317 rc = LDAP_NOT_SUPPORTED;