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 * Initialize TLS subsystem. Should be called only once.
104 ldap_pvt_tls_init( void )
106 static int tls_initialized = 0;
108 if ( tls_initialized ) return 0;
111 (void) tls_seed_PRNG( tls_opt_randfile );
113 #ifdef LDAP_R_COMPILE
117 SSL_load_error_strings();
118 SSLeay_add_ssl_algorithms();
120 /* FIXME: mod_ssl does this */
121 X509V3_add_standard_extensions();
126 * initialize the default context
129 ldap_pvt_tls_init_def_ctx( void )
131 STACK_OF(X509_NAME) *calist;
133 #ifdef LDAP_R_COMPILE
134 ldap_pvt_thread_mutex_lock( &tls_def_ctx_mutex );
136 if ( tls_def_ctx == NULL ) {
137 tls_def_ctx = SSL_CTX_new( SSLv23_method() );
138 if ( tls_def_ctx == NULL ) {
139 Debug( LDAP_DEBUG_ANY,
140 "TLS: could not allocate default ctx (%d).\n",
141 ERR_peek_error(),0,0);
144 if ( tls_opt_ciphersuite &&
145 !SSL_CTX_set_cipher_list( tls_def_ctx,
146 tls_opt_ciphersuite ) ) {
147 Debug( LDAP_DEBUG_ANY,
148 "TLS: could not set cipher list %s.\n",
149 tls_opt_ciphersuite, 0, 0 );
153 if (tls_opt_cacertfile != NULL || tls_opt_cacertdir != NULL) {
154 if ( !SSL_CTX_load_verify_locations( tls_def_ctx,
157 || !SSL_CTX_set_default_verify_paths( tls_def_ctx ) )
159 Debug( LDAP_DEBUG_ANY,
160 "TLS: could not load verify locations (file:`%s',dir:`%s').\n",
161 tls_opt_cacertfile,tls_opt_cacertdir,0);
165 calist = get_ca_list( tls_opt_cacertfile, tls_opt_cacertdir );
167 Debug( LDAP_DEBUG_ANY,
168 "TLS: could not load client CA list (file:`%s',dir:`%s').\n",
169 tls_opt_cacertfile,tls_opt_cacertdir,0);
173 SSL_CTX_set_client_CA_list( tls_def_ctx, calist );
175 if ( tls_opt_keyfile &&
176 !SSL_CTX_use_PrivateKey_file( tls_def_ctx,
178 SSL_FILETYPE_PEM ) ) {
179 Debug( LDAP_DEBUG_ANY,
180 "TLS: could not use key file `%s'.\n",
181 tls_opt_keyfile,0,0);
185 if ( tls_opt_certfile &&
186 !SSL_CTX_use_certificate_file( tls_def_ctx,
188 SSL_FILETYPE_PEM ) ) {
189 Debug( LDAP_DEBUG_ANY,
190 "TLS: could not use certificate `%s'.\n",
191 tls_opt_certfile,0,0);
195 if ( ( tls_opt_certfile || tls_opt_keyfile ) &&
196 !SSL_CTX_check_private_key( tls_def_ctx ) ) {
197 Debug( LDAP_DEBUG_ANY,
198 "TLS: private key mismatch.\n",
203 if ( tls_opt_trace ) {
204 SSL_CTX_set_info_callback( tls_def_ctx, tls_info_cb );
206 SSL_CTX_set_verify( tls_def_ctx,
207 tls_opt_require_cert ?
208 (SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT) :
211 SSL_CTX_set_tmp_rsa_callback( tls_def_ctx, tls_tmp_rsa_cb );
212 /* SSL_CTX_set_tmp_dh_callback( tls_def_ctx, tls_tmp_dh_cb ); */
214 #ifdef LDAP_R_COMPILE
215 ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
219 if ( tls_def_ctx != NULL ) {
220 SSL_CTX_free( tls_def_ctx );
223 #ifdef LDAP_R_COMPILE
224 ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
229 static STACK_OF(X509_NAME) *
230 get_ca_list( char * bundle, char * dir )
232 STACK_OF(X509_NAME) *ca_list = NULL;
235 ca_list = SSL_load_client_CA_file( bundle );
238 * FIXME: We have now to go over all files in dir, load them
239 * and add every certificate there to ca_list.
245 alloc_handle( void *ctx_arg )
251 ctx = (SSL_CTX *) ctx_arg;
253 if ( ldap_pvt_tls_init_def_ctx() < 0 )
258 ssl = SSL_new( ctx );
260 Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
264 if ( tls_opt_trace ) {
265 SSL_set_info_callback( ssl, tls_info_cb );
271 update_flags( Sockbuf *sb, SSL * ssl, int rc )
273 int err = SSL_get_error(ssl, rc);
275 sb->sb_trans_needs_read = 0;
276 sb->sb_trans_needs_write = 0;
277 if (err == SSL_ERROR_WANT_READ)
279 sb->sb_trans_needs_read = 1;
281 } else if (err == SSL_ERROR_WANT_WRITE)
283 sb->sb_trans_needs_write = 1;
285 } else if (err == SSL_ERROR_WANT_CONNECT)
293 * TLS support for LBER Sockbufs
298 Sockbuf_IO_Desc *sbiod;
301 extern BIO_METHOD ldap_pvt_sb_bio_method;
304 sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg )
309 assert( sbiod != NULL );
311 p = LBER_MALLOC( sizeof( *p ) );
317 bio = BIO_new( &ldap_pvt_sb_bio_method );
318 bio->ptr = (void *)p;
319 SSL_set_bio( p->ssl, bio, bio );
320 sbiod->sbiod_pvt = p;
325 sb_tls_remove( Sockbuf_IO_Desc *sbiod )
329 assert( sbiod != NULL );
330 assert( sbiod->sbiod_pvt != NULL );
332 p = (struct tls_data *)sbiod->sbiod_pvt;
334 LBER_FREE( sbiod->sbiod_pvt );
335 sbiod->sbiod_pvt = NULL;
340 sb_tls_close( Sockbuf_IO_Desc *sbiod )
344 assert( sbiod != NULL );
345 assert( sbiod->sbiod_pvt != NULL );
347 p = (struct tls_data *)sbiod->sbiod_pvt;
348 SSL_shutdown( p->ssl );
353 sb_tls_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
357 assert( sbiod != NULL );
358 assert( sbiod->sbiod_pvt != NULL );
360 p = (struct tls_data *)sbiod->sbiod_pvt;
362 if ( opt == LBER_SB_OPT_GET_SSL ) {
363 *((SSL **)arg) = p->ssl;
366 } else if ( opt == LBER_SB_OPT_DATA_READY ) {
367 if( SSL_pending( p->ssl ) > 0 ) {
372 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
376 sb_tls_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
382 assert( sbiod != NULL );
383 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
385 p = (struct tls_data *)sbiod->sbiod_pvt;
387 ret = SSL_read( p->ssl, (char *)buf, len );
389 errno = WSAGetLastError();
391 err = SSL_get_error( p->ssl, ret );
392 if (err == SSL_ERROR_WANT_READ ) {
393 sbiod->sbiod_sb->sb_trans_needs_read = 1;
399 sbiod->sbiod_sb->sb_trans_needs_read = 0;
404 sb_tls_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
410 assert( sbiod != NULL );
411 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
413 p = (struct tls_data *)sbiod->sbiod_pvt;
415 ret = SSL_write( p->ssl, (char *)buf, len );
417 errno = WSAGetLastError();
419 err = SSL_get_error( p->ssl, ret );
420 if (err == SSL_ERROR_WANT_WRITE ) {
421 sbiod->sbiod_sb->sb_trans_needs_write = 1;
427 sbiod->sbiod_sb->sb_trans_needs_write = 0;
431 Sockbuf_IO ldap_pvt_sockbuf_io_tls =
433 sb_tls_setup, /* sbi_setup */
434 sb_tls_remove, /* sbi_remove */
435 sb_tls_ctrl, /* sbi_ctrl */
436 sb_tls_read, /* sbi_read */
437 sb_tls_write, /* sbi_write */
438 sb_tls_close /* sbi_close */
442 sb_tls_bio_create( BIO *b ) {
451 sb_tls_bio_destroy( BIO *b )
456 b->ptr = NULL; /* sb_tls_remove() will free it */
463 sb_tls_bio_read( BIO *b, char *buf, int len )
468 if ( buf == NULL || len <= 0 )
471 p = (struct tls_data *)b->ptr;
473 if ( p == NULL || p->sbiod == NULL )
476 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
478 BIO_clear_retry_flags( b );
479 if ( ret < 0 && errno == EWOULDBLOCK )
480 BIO_set_retry_read( b );
486 sb_tls_bio_write( BIO *b, char *buf, int len )
491 if ( buf == NULL || len <= 0 )
494 p = (struct tls_data *)b->ptr;
496 if ( p == NULL || p->sbiod == NULL )
499 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, buf, len );
501 BIO_clear_retry_flags( b );
502 if ( ret < 0 && errno == EWOULDBLOCK )
503 BIO_set_retry_write( b );
509 sb_tls_bio_ctrl( BIO *b, int cmd, long num, char *ptr )
511 if ( cmd == BIO_CTRL_FLUSH ) {
512 /* The OpenSSL library needs this */
519 sb_tls_bio_gets( BIO *b, char *buf, int len )
525 sb_tls_bio_puts( BIO *b, char *str )
527 return sb_tls_bio_write( b, str, strlen( str ) );
530 BIO_METHOD ldap_pvt_sb_bio_method =
532 ( 100 | 0x400 ), /* it's a source/sink BIO */
544 * Call this to do a TLS connect on a sockbuf. ctx_arg can be
545 * a SSL_CTX * or NULL, in which case the default ctx is used.
549 * 0 - Success. Connection is ready for communication.
550 * <0 - Error. Can't create a TLS stream.
551 * >0 - Partial success.
552 * Do a select (using information from lber_pvt_sb_needs_{read,write}
557 ldap_int_tls_connect( LDAP *ld, LDAPConn *conn )
559 Sockbuf *sb = conn->lconn_sb;
560 void *ctx = ld->ld_defconn->lconn_tls_ctx;
565 if ( HAS_TLS( sb ) ) {
566 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
568 ssl = alloc_handle( ctx );
572 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
573 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
575 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
576 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
579 err = SSL_connect( ssl );
582 errno = WSAGetLastError();
585 if ( update_flags( sb, ssl, err ))
587 if ((err = ERR_peek_error())) {
589 ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf));
591 Debug( LDAP_DEBUG_ANY,"TLS: can't connect.\n",0,0,0);
592 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
593 LBER_SBIOD_LEVEL_TRANSPORT );
595 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
596 LBER_SBIOD_LEVEL_TRANSPORT );
604 * Call this to do a TLS accept on a sockbuf.
605 * Everything else is the same as with tls_connect.
608 ldap_pvt_tls_accept( Sockbuf *sb, void *ctx_arg )
613 if ( HAS_TLS( sb ) ) {
614 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
616 ssl = alloc_handle( ctx_arg );
620 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
621 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
623 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
624 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
627 err = SSL_accept( ssl );
630 errno = WSAGetLastError();
633 if ( update_flags( sb, ssl, err ))
635 Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 );
637 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
638 LBER_SBIOD_LEVEL_TRANSPORT );
640 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
641 LBER_SBIOD_LEVEL_TRANSPORT );
650 ldap_pvt_tls_inplace ( Sockbuf *sb )
658 ldap_pvt_tls_sb_ctx( Sockbuf *sb )
663 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p );
671 ldap_pvt_tls_get_strength( void *s )
675 c = SSL_get_current_cipher((SSL *)s);
676 return SSL_CIPHER_get_bits(c, NULL);
681 ldap_pvt_tls_get_peer( void *s )
687 x = SSL_get_peer_certificate((SSL *)s);
692 xn = X509_get_subject_name(x);
693 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
699 ldap_pvt_tls_get_peer_dn( void *s )
703 char buf[2048], *p, *dn;
705 x = SSL_get_peer_certificate((SSL *)s);
709 xn = X509_get_subject_name(x);
710 p = X509_NAME_oneline(xn, buf, sizeof(buf));
712 dn = ldap_dcedn2dn( p );
719 ldap_pvt_tls_get_peer_hostname( void *s )
726 x = SSL_get_peer_certificate((SSL *)s);
731 xn = X509_get_subject_name(x);
733 ret = X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf));
739 p = LDAP_STRDUP(buf);
745 ldap_pvt_tls_get_peer_issuer( void *s )
747 #if 0 /* currently unused; see ldap_pvt_tls_get_peer() if needed */
752 x = SSL_get_peer_certificate((SSL *)s);
757 xn = X509_get_issuer_name(x);
758 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
767 ldap_int_tls_config( LDAP *ld, int option, const char *arg )
772 case LDAP_OPT_X_TLS_CACERTFILE:
773 case LDAP_OPT_X_TLS_CACERTDIR:
774 case LDAP_OPT_X_TLS_CERTFILE:
775 case LDAP_OPT_X_TLS_KEYFILE:
776 case LDAP_OPT_X_TLS_RANDOM_FILE:
777 return ldap_pvt_tls_set_option( NULL, option, (void *) arg );
779 case LDAP_OPT_X_TLS_REQUIRE_CERT:
780 i = ( ( strcasecmp( arg, "on" ) == 0 ) ||
781 ( strcasecmp( arg, "yes" ) == 0) ||
782 ( strcasecmp( arg, "true" ) == 0 ) );
783 return ldap_pvt_tls_set_option( NULL, option, (void *) &i );
787 if ( strcasecmp( arg, "never" ) == 0 )
788 i = LDAP_OPT_X_TLS_NEVER ;
789 if ( strcasecmp( arg, "demand" ) == 0 )
790 i = LDAP_OPT_X_TLS_DEMAND ;
791 if ( strcasecmp( arg, "allow" ) == 0 )
792 i = LDAP_OPT_X_TLS_ALLOW ;
793 if ( strcasecmp( arg, "try" ) == 0 )
794 i = LDAP_OPT_X_TLS_TRY ;
795 if ( strcasecmp( arg, "hard" ) == 0 )
796 i = LDAP_OPT_X_TLS_HARD ;
799 return ldap_pvt_tls_set_option( ld, option, &i );
808 ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg )
810 struct ldapoptions *lo;
812 /* Get pointer to global option structure */
813 lo = LDAP_INT_GLOBAL_OPT();
815 return LDAP_NO_MEMORY;
819 assert( LDAP_VALID( ld ) );
821 if( !LDAP_VALID( ld ) ) {
822 return LDAP_OPT_ERROR;
825 lo = &ld->ld_options;
830 *(int *)arg = lo->ldo_tls_mode;
832 case LDAP_OPT_X_TLS_CTX:
834 *(void **)arg = (void *) tls_def_ctx;
836 *(void **)arg = ld->ld_defconn->lconn_tls_ctx;
838 case LDAP_OPT_X_TLS_CACERTFILE:
839 *(char **)arg = tls_opt_cacertfile ?
840 LDAP_STRDUP( tls_opt_cacertfile ) : NULL;
842 case LDAP_OPT_X_TLS_CACERTDIR:
843 *(char **)arg = tls_opt_cacertdir ?
844 LDAP_STRDUP( tls_opt_cacertdir ) : NULL;
846 case LDAP_OPT_X_TLS_CERTFILE:
847 *(char **)arg = tls_opt_certfile ?
848 LDAP_STRDUP( tls_opt_certfile ) : NULL;
850 case LDAP_OPT_X_TLS_KEYFILE:
851 *(char **)arg = tls_opt_keyfile ?
852 LDAP_STRDUP( tls_opt_keyfile ) : NULL;
854 case LDAP_OPT_X_TLS_REQUIRE_CERT:
855 *(int *)arg = tls_opt_require_cert;
857 case LDAP_OPT_X_TLS_RANDOM_FILE:
858 *(char **)arg = tls_opt_randfile;
867 ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
869 struct ldapoptions *lo;
871 /* Get pointer to global option structure */
872 lo = LDAP_INT_GLOBAL_OPT();
874 return LDAP_NO_MEMORY;
878 assert( LDAP_VALID( ld ) );
880 if( !LDAP_VALID( ld ) ) {
881 return LDAP_OPT_ERROR;
884 lo = &ld->ld_options;
889 switch( *(int *) arg ) {
890 case LDAP_OPT_X_TLS_NEVER:
891 case LDAP_OPT_X_TLS_DEMAND:
892 case LDAP_OPT_X_TLS_ALLOW:
893 case LDAP_OPT_X_TLS_TRY:
894 case LDAP_OPT_X_TLS_HARD:
896 lo->ldo_tls_mode = *(int *)arg;
903 case LDAP_OPT_X_TLS_CTX:
905 tls_def_ctx = (SSL_CTX *) arg;
908 ld->ld_defconn->lconn_tls_ctx = arg;
918 case LDAP_OPT_X_TLS_CACERTFILE:
919 if ( tls_opt_cacertfile ) LDAP_FREE( tls_opt_cacertfile );
920 tls_opt_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
922 case LDAP_OPT_X_TLS_CACERTDIR:
923 if ( tls_opt_cacertdir ) LDAP_FREE( tls_opt_cacertdir );
924 tls_opt_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
926 case LDAP_OPT_X_TLS_CERTFILE:
927 if ( tls_opt_certfile ) LDAP_FREE( tls_opt_certfile );
928 tls_opt_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
930 case LDAP_OPT_X_TLS_KEYFILE:
931 if ( tls_opt_keyfile ) LDAP_FREE( tls_opt_keyfile );
932 tls_opt_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
934 case LDAP_OPT_X_TLS_REQUIRE_CERT:
935 tls_opt_require_cert = * (int *) arg;
937 case LDAP_OPT_X_TLS_CIPHER_SUITE:
938 if ( tls_opt_ciphersuite ) LDAP_FREE( tls_opt_ciphersuite );
939 tls_opt_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
941 case LDAP_OPT_X_TLS_RANDOM_FILE:
942 if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile );
943 tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
952 ldap_int_tls_start ( LDAP *ld, LDAPConn *conn )
954 Sockbuf *sb = conn->lconn_sb;
955 char *host = conn->lconn_server->lud_host;
956 void *ctx = ld->ld_defconn->lconn_tls_ctx;
961 (void) ldap_pvt_tls_init();
964 * Fortunately, the lib uses blocking io...
966 if ( ldap_int_tls_connect( ld, conn ) < 0 ) {
967 return LDAP_CONNECT_ERROR;
970 ssl = (void *) ldap_pvt_tls_sb_ctx( sb );
971 assert( ssl != NULL );
974 * compare host with name in certificate
977 peer_cert_cn = ldap_pvt_tls_get_peer_hostname( ssl );
978 if ( !peer_cert_cn ) {
979 /* could not get hostname from peer certificate */
980 Debug( LDAP_DEBUG_ANY,
981 "TLS: unable to get common name from peer certificate.\n",
983 return LDAP_LOCAL_ERROR;
986 if ( strcasecmp( host, peer_cert_cn ) != 0 ) {
987 Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
988 "common name in certificate (%s).\n",
989 host, peer_cert_cn, 0 );
990 LDAP_FREE( peer_cert_cn );
991 return LDAP_CONNECT_ERROR;
994 LDAP_FREE( peer_cert_cn );
997 * set SASL properties to TLS ssf and authid
1003 /* we need to let SASL know */
1004 ssf = ldap_pvt_tls_get_strength( ssl );
1005 authid = ldap_pvt_tls_get_peer( ssl );
1007 (void) ldap_int_sasl_external( ld, authid, ssf );
1010 return LDAP_SUCCESS;
1013 /* Derived from openssl/apps/s_cb.c */
1015 tls_info_cb( SSL *ssl, int where, int ret )
1020 w = where & ~SSL_ST_MASK;
1021 if ( w & SSL_ST_CONNECT ) {
1023 } else if ( w & SSL_ST_ACCEPT ) {
1029 if ( where & SSL_CB_LOOP ) {
1030 Debug( LDAP_DEBUG_TRACE,
1031 "TLS trace: %s:%s\n",
1032 op, SSL_state_string_long( ssl ), 0 );
1033 } else if ( where & SSL_CB_ALERT ) {
1034 op = ( where & SSL_CB_READ ) ? "read" : "write";
1035 Debug( LDAP_DEBUG_TRACE,
1036 "TLS trace: SSL3 alert %s:%s:%s\n",
1038 SSL_alert_type_string_long( ret ),
1039 SSL_alert_desc_string_long( ret) );
1040 } else if ( where & SSL_CB_EXIT ) {
1042 Debug( LDAP_DEBUG_TRACE,
1043 "TLS trace: %s:failed in %s\n",
1044 op, SSL_state_string_long( ssl ), 0 );
1045 } else if ( ret < 0 ) {
1046 Debug( LDAP_DEBUG_TRACE,
1047 "TLS trace: %s:error in %s\n",
1048 op, SSL_state_string_long( ssl ), 0 );
1054 tls_verify_cb( int ok, X509_STORE_CTX *ctx )
1064 cert = X509_STORE_CTX_get_current_cert( ctx );
1065 errnum = X509_STORE_CTX_get_error( ctx );
1066 errdepth = X509_STORE_CTX_get_error_depth( ctx );
1069 * X509_get_*_name return pointers to the internal copies of
1070 * those things requested. So do not free them.
1072 subject = X509_get_subject_name( cert );
1073 issuer = X509_get_issuer_name( cert );
1074 /* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
1075 sname = X509_NAME_oneline( subject, NULL, 0 );
1076 iname = X509_NAME_oneline( issuer, NULL, 0 );
1077 Debug( LDAP_DEBUG_TRACE,
1078 "TLS certificate verification: depth: %d, subject: %s, issuer: %s\n",
1080 sname ? sname : "-unknown-",
1081 iname ? iname : "-unknown-" );
1083 CRYPTO_free ( sname );
1085 CRYPTO_free ( iname );
1090 /* Inspired by ERR_print_errors in OpenSSL */
1092 tls_report_error( void )
1099 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
1100 Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
1101 ERR_error_string( l, buf ), file, line );
1106 tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
1110 /* FIXME: Pregenerate the key on startup */
1111 /* FIXME: Who frees the key? */
1112 tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
1115 Debug( LDAP_DEBUG_ANY,
1116 "TLS: Failed to generate temporary %d-bit %s RSA key\n",
1117 key_length, is_export ? "export" : "domestic", 0 );
1124 tls_seed_PRNG( const char *randfile )
1126 #ifndef URANDOM_DEVICE
1127 /* no /dev/urandom (or equiv) */
1129 char buffer[MAXPATHLEN];
1131 if (randfile == NULL) {
1132 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
1133 * If $HOME is not set or buffer too small to hold the pathname,
1134 * an error occurs. - From RAND_file_name() man page.
1135 * The fact is that when $HOME is NULL, .rnd is used.
1137 randfile = RAND_file_name( buffer, sizeof( buffer ) );
1139 } else if (RAND_egd(randfile) > 0) {
1144 if (randfile == NULL) {
1145 Debug( LDAP_DEBUG_ANY,
1146 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
1151 total = RAND_load_file(randfile, -1);
1153 if (RAND_status() == 0) {
1154 Debug( LDAP_DEBUG_ANY,
1155 "TLS: PRNG not been seeded with enough data\n",
1160 /* assume if there was enough bits to seed that it's okay
1161 * to write derived bits to the file
1163 RAND_write_file(randfile);
1172 tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
1180 ldap_start_tls_s ( LDAP *ld,
1181 LDAPControl **serverctrls,
1182 LDAPControl **clientctrls )
1187 char *rspoid = NULL;
1188 struct berval *rspdata = NULL;
1190 /* XXYYZ: this initiates operation only on default connection! */
1192 if ( ldap_pvt_tls_inplace( ld->ld_sb ) != 0 ) {
1193 return LDAP_LOCAL_ERROR;
1196 rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS,
1197 NULL, serverctrls, clientctrls, &rspoid, &rspdata );
1198 if ( rc != LDAP_SUCCESS ) {
1202 if ( rspoid != NULL ) {
1206 if ( rspdata != NULL ) {
1207 ber_bvfree( rspdata );
1210 rc = ldap_int_tls_start( ld, ld->ld_defconn );
1212 rc = LDAP_NOT_SUPPORTED;