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 ) return NULL;
257 ssl = SSL_new( ctx );
259 Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
266 update_flags( Sockbuf *sb, SSL * ssl, int rc )
268 int err = SSL_get_error(ssl, rc);
270 sb->sb_trans_needs_read = 0;
271 sb->sb_trans_needs_write = 0;
272 if (err == SSL_ERROR_WANT_READ)
274 sb->sb_trans_needs_read = 1;
276 } else if (err == SSL_ERROR_WANT_WRITE)
278 sb->sb_trans_needs_write = 1;
280 } else if (err == SSL_ERROR_WANT_CONNECT)
288 * TLS support for LBER Sockbufs
293 Sockbuf_IO_Desc *sbiod;
296 extern BIO_METHOD ldap_pvt_sb_bio_method;
299 sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg )
304 assert( sbiod != NULL );
306 p = LBER_MALLOC( sizeof( *p ) );
312 bio = BIO_new( &ldap_pvt_sb_bio_method );
313 bio->ptr = (void *)p;
314 SSL_set_bio( p->ssl, bio, bio );
315 sbiod->sbiod_pvt = p;
320 sb_tls_remove( Sockbuf_IO_Desc *sbiod )
324 assert( sbiod != NULL );
325 assert( sbiod->sbiod_pvt != NULL );
327 p = (struct tls_data *)sbiod->sbiod_pvt;
329 LBER_FREE( sbiod->sbiod_pvt );
330 sbiod->sbiod_pvt = NULL;
335 sb_tls_close( Sockbuf_IO_Desc *sbiod )
339 assert( sbiod != NULL );
340 assert( sbiod->sbiod_pvt != NULL );
342 p = (struct tls_data *)sbiod->sbiod_pvt;
343 SSL_shutdown( p->ssl );
348 sb_tls_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
352 assert( sbiod != NULL );
353 assert( sbiod->sbiod_pvt != NULL );
355 p = (struct tls_data *)sbiod->sbiod_pvt;
357 if ( opt == LBER_SB_OPT_GET_SSL ) {
358 *((SSL **)arg) = p->ssl;
361 } else if ( opt == LBER_SB_OPT_DATA_READY ) {
362 if( SSL_pending( p->ssl ) > 0 ) {
367 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
371 sb_tls_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
377 assert( sbiod != NULL );
378 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
380 p = (struct tls_data *)sbiod->sbiod_pvt;
382 ret = SSL_read( p->ssl, (char *)buf, len );
384 errno = WSAGetLastError();
386 err = SSL_get_error( p->ssl, ret );
387 if (err == SSL_ERROR_WANT_READ ) {
388 sbiod->sbiod_sb->sb_trans_needs_read = 1;
394 sbiod->sbiod_sb->sb_trans_needs_read = 0;
399 sb_tls_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
405 assert( sbiod != NULL );
406 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
408 p = (struct tls_data *)sbiod->sbiod_pvt;
410 ret = SSL_write( p->ssl, (char *)buf, len );
412 errno = WSAGetLastError();
414 err = SSL_get_error( p->ssl, ret );
415 if (err == SSL_ERROR_WANT_WRITE ) {
416 sbiod->sbiod_sb->sb_trans_needs_write = 1;
422 sbiod->sbiod_sb->sb_trans_needs_write = 0;
426 Sockbuf_IO ldap_pvt_sockbuf_io_tls =
428 sb_tls_setup, /* sbi_setup */
429 sb_tls_remove, /* sbi_remove */
430 sb_tls_ctrl, /* sbi_ctrl */
431 sb_tls_read, /* sbi_read */
432 sb_tls_write, /* sbi_write */
433 sb_tls_close /* sbi_close */
437 sb_tls_bio_create( BIO *b ) {
446 sb_tls_bio_destroy( BIO *b )
451 b->ptr = NULL; /* sb_tls_remove() will free it */
458 sb_tls_bio_read( BIO *b, char *buf, int len )
463 if ( buf == NULL || len <= 0 )
466 p = (struct tls_data *)b->ptr;
468 if ( p == NULL || p->sbiod == NULL )
471 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
473 BIO_clear_retry_flags( b );
474 if ( ret < 0 && errno == EWOULDBLOCK )
475 BIO_set_retry_read( b );
481 sb_tls_bio_write( BIO *b, char *buf, int len )
486 if ( buf == NULL || len <= 0 )
489 p = (struct tls_data *)b->ptr;
491 if ( p == NULL || p->sbiod == NULL )
494 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, buf, len );
496 BIO_clear_retry_flags( b );
497 if ( ret < 0 && errno == EWOULDBLOCK )
498 BIO_set_retry_write( b );
504 sb_tls_bio_ctrl( BIO *b, int cmd, long num, char *ptr )
506 if ( cmd == BIO_CTRL_FLUSH ) {
507 /* The OpenSSL library needs this */
514 sb_tls_bio_gets( BIO *b, char *buf, int len )
520 sb_tls_bio_puts( BIO *b, char *str )
522 return sb_tls_bio_write( b, str, strlen( str ) );
525 BIO_METHOD ldap_pvt_sb_bio_method =
527 ( 100 | 0x400 ), /* it's a source/sink BIO */
539 * Call this to do a TLS connect on a sockbuf. ctx_arg can be
540 * a SSL_CTX * or NULL, in which case the default ctx is used.
544 * 0 - Success. Connection is ready for communication.
545 * <0 - Error. Can't create a TLS stream.
546 * >0 - Partial success.
547 * Do a select (using information from lber_pvt_sb_needs_{read,write}
552 ldap_int_tls_connect( LDAP *ld, LDAPConn *conn )
554 Sockbuf *sb = conn->lconn_sb;
558 if ( HAS_TLS( sb ) ) {
559 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
562 void *ctx = ld->ld_defconn
563 ? ld->ld_defconn->lconn_tls_ctx : NULL;
565 ssl = alloc_handle( ctx );
567 if ( ssl == NULL ) return -1;
570 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
571 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
573 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
574 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
577 conn->lconn_tls_ctx = tls_def_ctx;
581 err = SSL_connect( ssl );
584 errno = WSAGetLastError();
587 if ( update_flags( sb, ssl, err )) {
590 if ((err = ERR_peek_error())) {
592 ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf));
594 Debug( LDAP_DEBUG_ANY,"TLS: can't connect.\n",0,0,0);
595 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
596 LBER_SBIOD_LEVEL_TRANSPORT );
598 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
599 LBER_SBIOD_LEVEL_TRANSPORT );
608 * Call this to do a TLS accept on a sockbuf.
609 * Everything else is the same as with tls_connect.
612 ldap_pvt_tls_accept( Sockbuf *sb, void *ctx_arg )
617 if ( HAS_TLS( sb ) ) {
618 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
620 ssl = alloc_handle( ctx_arg );
624 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
625 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
627 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
628 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
631 err = SSL_accept( ssl );
634 errno = WSAGetLastError();
637 if ( update_flags( sb, ssl, err ))
639 Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 );
641 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
642 LBER_SBIOD_LEVEL_TRANSPORT );
644 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
645 LBER_SBIOD_LEVEL_TRANSPORT );
654 ldap_pvt_tls_inplace ( Sockbuf *sb )
662 ldap_pvt_tls_sb_ctx( Sockbuf *sb )
667 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p );
675 ldap_pvt_tls_get_strength( void *s )
679 c = SSL_get_current_cipher((SSL *)s);
680 return SSL_CIPHER_get_bits(c, NULL);
685 ldap_pvt_tls_get_peer( void *s )
691 x = SSL_get_peer_certificate((SSL *)s);
696 xn = X509_get_subject_name(x);
697 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
703 ldap_pvt_tls_get_peer_dn( void *s )
707 char buf[2048], *p, *dn;
709 x = SSL_get_peer_certificate((SSL *)s);
713 xn = X509_get_subject_name(x);
714 p = X509_NAME_oneline(xn, buf, sizeof(buf));
716 dn = ldap_dcedn2dn( p );
723 ldap_pvt_tls_get_peer_hostname( void *s )
730 x = SSL_get_peer_certificate((SSL *)s);
735 xn = X509_get_subject_name(x);
737 ret = X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf));
743 p = LDAP_STRDUP(buf);
749 ldap_pvt_tls_check_hostname( void *s, char *name )
751 int i, ret = LDAP_LOCAL_ERROR;
754 x = SSL_get_peer_certificate((SSL *)s);
757 Debug( LDAP_DEBUG_ANY,
758 "TLS: unable to get peer certificate.\n",
763 i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
767 STACK_OF(GENERAL_NAME) *alt;
769 ex = X509_get_ext(x, i);
770 alt = X509V3_EXT_d2i(ex);
776 X509V3_EXT_METHOD *method;
779 n = sk_GENERAL_NAME_num(alt);
780 domain = strchr(name, '.');
782 len2 = len1 - (domain-name);
785 gn = sk_GENERAL_NAME_value(alt, i);
786 if (gn->type == GEN_DNS)
788 char *sn = ASN1_STRING_data(gn->d.ia5);
789 int sl = ASN1_STRING_length(gn->d.ia5);
791 /* Is this an exact match? */
792 if ((len1 == sl) && !strncasecmp(name, sn, len1))
795 /* Is this a wildcard match? */
796 if ((*sn == '*') && domain && (len2 == sl-1) &&
797 !strncasecmp(domain, sn+1, len2))
801 method = X509V3_EXT_get(ex);
802 method->ext_free(alt);
803 if (i < n) /* Found a match */
808 if (ret != LDAP_SUCCESS)
813 xn = X509_get_subject_name(x);
815 if (X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf))
818 Debug( LDAP_DEBUG_ANY,
819 "TLS: unable to get common name from peer certificate.\n",
821 } else if (strcasecmp(name, buf))
823 Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
824 "common name in certificate (%s).\n",
826 ret = LDAP_CONNECT_ERROR;
837 ldap_pvt_tls_get_peer_issuer( void *s )
839 #if 0 /* currently unused; see ldap_pvt_tls_get_peer() if needed */
844 x = SSL_get_peer_certificate((SSL *)s);
849 xn = X509_get_issuer_name(x);
850 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
859 ldap_int_tls_config( LDAP *ld, int option, const char *arg )
864 case LDAP_OPT_X_TLS_CACERTFILE:
865 case LDAP_OPT_X_TLS_CACERTDIR:
866 case LDAP_OPT_X_TLS_CERTFILE:
867 case LDAP_OPT_X_TLS_KEYFILE:
868 case LDAP_OPT_X_TLS_RANDOM_FILE:
869 return ldap_pvt_tls_set_option( NULL, option, (void *) arg );
871 case LDAP_OPT_X_TLS_REQUIRE_CERT:
872 i = ( ( strcasecmp( arg, "on" ) == 0 ) ||
873 ( strcasecmp( arg, "yes" ) == 0) ||
874 ( strcasecmp( arg, "true" ) == 0 ) );
875 return ldap_pvt_tls_set_option( NULL, option, (void *) &i );
879 if ( strcasecmp( arg, "never" ) == 0 )
880 i = LDAP_OPT_X_TLS_NEVER ;
881 if ( strcasecmp( arg, "demand" ) == 0 )
882 i = LDAP_OPT_X_TLS_DEMAND ;
883 if ( strcasecmp( arg, "allow" ) == 0 )
884 i = LDAP_OPT_X_TLS_ALLOW ;
885 if ( strcasecmp( arg, "try" ) == 0 )
886 i = LDAP_OPT_X_TLS_TRY ;
887 if ( strcasecmp( arg, "hard" ) == 0 )
888 i = LDAP_OPT_X_TLS_HARD ;
891 return ldap_pvt_tls_set_option( ld, option, &i );
900 ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg )
902 struct ldapoptions *lo;
905 assert( LDAP_VALID( ld ) );
907 if( !LDAP_VALID( ld ) ) {
908 return LDAP_OPT_ERROR;
911 lo = &ld->ld_options;
914 /* Get pointer to global option structure */
915 lo = LDAP_INT_GLOBAL_OPT();
917 return LDAP_NO_MEMORY;
923 *(int *)arg = lo->ldo_tls_mode;
925 case LDAP_OPT_X_TLS_CTX:
927 *(void **)arg = (void *) tls_def_ctx;
929 *(void **)arg = ld->ld_defconn->lconn_tls_ctx;
931 case LDAP_OPT_X_TLS_CACERTFILE:
932 *(char **)arg = tls_opt_cacertfile ?
933 LDAP_STRDUP( tls_opt_cacertfile ) : NULL;
935 case LDAP_OPT_X_TLS_CACERTDIR:
936 *(char **)arg = tls_opt_cacertdir ?
937 LDAP_STRDUP( tls_opt_cacertdir ) : NULL;
939 case LDAP_OPT_X_TLS_CERTFILE:
940 *(char **)arg = tls_opt_certfile ?
941 LDAP_STRDUP( tls_opt_certfile ) : NULL;
943 case LDAP_OPT_X_TLS_KEYFILE:
944 *(char **)arg = tls_opt_keyfile ?
945 LDAP_STRDUP( tls_opt_keyfile ) : NULL;
947 case LDAP_OPT_X_TLS_REQUIRE_CERT:
948 *(int *)arg = tls_opt_require_cert;
950 case LDAP_OPT_X_TLS_RANDOM_FILE:
951 *(char **)arg = tls_opt_randfile;
960 ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
962 struct ldapoptions *lo;
965 assert( LDAP_VALID( ld ) );
967 if( !LDAP_VALID( ld ) ) {
968 return LDAP_OPT_ERROR;
971 lo = &ld->ld_options;
974 /* Get pointer to global option structure */
975 lo = LDAP_INT_GLOBAL_OPT();
977 return LDAP_NO_MEMORY;
983 switch( *(int *) arg ) {
984 case LDAP_OPT_X_TLS_NEVER:
985 case LDAP_OPT_X_TLS_DEMAND:
986 case LDAP_OPT_X_TLS_ALLOW:
987 case LDAP_OPT_X_TLS_TRY:
988 case LDAP_OPT_X_TLS_HARD:
990 lo->ldo_tls_mode = *(int *)arg;
997 case LDAP_OPT_X_TLS_CTX:
999 tls_def_ctx = (SSL_CTX *) arg;
1002 ld->ld_defconn->lconn_tls_ctx = arg;
1012 case LDAP_OPT_X_TLS_CACERTFILE:
1013 if ( tls_opt_cacertfile ) LDAP_FREE( tls_opt_cacertfile );
1014 tls_opt_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1016 case LDAP_OPT_X_TLS_CACERTDIR:
1017 if ( tls_opt_cacertdir ) LDAP_FREE( tls_opt_cacertdir );
1018 tls_opt_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1020 case LDAP_OPT_X_TLS_CERTFILE:
1021 if ( tls_opt_certfile ) LDAP_FREE( tls_opt_certfile );
1022 tls_opt_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1024 case LDAP_OPT_X_TLS_KEYFILE:
1025 if ( tls_opt_keyfile ) LDAP_FREE( tls_opt_keyfile );
1026 tls_opt_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1028 case LDAP_OPT_X_TLS_REQUIRE_CERT:
1029 tls_opt_require_cert = * (int *) arg;
1031 case LDAP_OPT_X_TLS_CIPHER_SUITE:
1032 if ( tls_opt_ciphersuite ) LDAP_FREE( tls_opt_ciphersuite );
1033 tls_opt_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1035 case LDAP_OPT_X_TLS_RANDOM_FILE:
1036 if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile );
1037 tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1046 ldap_int_tls_start ( LDAP *ld, LDAPConn *conn, LDAPURLDesc *srv )
1048 Sockbuf *sb = conn->lconn_sb;
1049 void *ctx = ld->ld_defconn->lconn_tls_ctx;
1055 host = srv->lud_host;
1057 host = conn->lconn_server->lud_host;
1060 (void) ldap_pvt_tls_init();
1063 * Fortunately, the lib uses blocking io...
1065 if ( ldap_int_tls_connect( ld, conn ) < 0 ) {
1066 return LDAP_CONNECT_ERROR;
1069 ssl = (void *) ldap_pvt_tls_sb_ctx( sb );
1070 assert( ssl != NULL );
1073 * compare host with name(s) in certificate
1076 ret = ldap_pvt_tls_check_hostname( ssl, host );
1077 if (ret != LDAP_SUCCESS)
1081 * set SASL properties to TLS ssf and authid
1087 /* we need to let SASL know */
1088 ssf = ldap_pvt_tls_get_strength( ssl );
1089 authid = ldap_pvt_tls_get_peer( ssl );
1091 (void) ldap_int_sasl_external( ld, authid, ssf );
1094 return LDAP_SUCCESS;
1097 /* Derived from openssl/apps/s_cb.c */
1099 tls_info_cb( SSL *ssl, int where, int ret )
1104 w = where & ~SSL_ST_MASK;
1105 if ( w & SSL_ST_CONNECT ) {
1107 } else if ( w & SSL_ST_ACCEPT ) {
1113 if ( where & SSL_CB_LOOP ) {
1114 Debug( LDAP_DEBUG_TRACE,
1115 "TLS trace: %s:%s\n",
1116 op, SSL_state_string_long( ssl ), 0 );
1117 } else if ( where & SSL_CB_ALERT ) {
1118 op = ( where & SSL_CB_READ ) ? "read" : "write";
1119 Debug( LDAP_DEBUG_TRACE,
1120 "TLS trace: SSL3 alert %s:%s:%s\n",
1122 SSL_alert_type_string_long( ret ),
1123 SSL_alert_desc_string_long( ret) );
1124 } else if ( where & SSL_CB_EXIT ) {
1126 Debug( LDAP_DEBUG_TRACE,
1127 "TLS trace: %s:failed in %s\n",
1128 op, SSL_state_string_long( ssl ), 0 );
1129 } else if ( ret < 0 ) {
1130 Debug( LDAP_DEBUG_TRACE,
1131 "TLS trace: %s:error in %s\n",
1132 op, SSL_state_string_long( ssl ), 0 );
1138 tls_verify_cb( int ok, X509_STORE_CTX *ctx )
1148 cert = X509_STORE_CTX_get_current_cert( ctx );
1149 errnum = X509_STORE_CTX_get_error( ctx );
1150 errdepth = X509_STORE_CTX_get_error_depth( ctx );
1153 * X509_get_*_name return pointers to the internal copies of
1154 * those things requested. So do not free them.
1156 subject = X509_get_subject_name( cert );
1157 issuer = X509_get_issuer_name( cert );
1158 /* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
1159 sname = X509_NAME_oneline( subject, NULL, 0 );
1160 iname = X509_NAME_oneline( issuer, NULL, 0 );
1161 Debug( LDAP_DEBUG_TRACE,
1162 "TLS certificate verification: depth: %d, subject: %s, issuer: %s\n",
1164 sname ? sname : "-unknown-",
1165 iname ? iname : "-unknown-" );
1167 CRYPTO_free ( sname );
1169 CRYPTO_free ( iname );
1174 /* Inspired by ERR_print_errors in OpenSSL */
1176 tls_report_error( void )
1183 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
1184 Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
1185 ERR_error_string( l, buf ), file, line );
1190 tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
1194 /* FIXME: Pregenerate the key on startup */
1195 /* FIXME: Who frees the key? */
1196 tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
1199 Debug( LDAP_DEBUG_ANY,
1200 "TLS: Failed to generate temporary %d-bit %s RSA key\n",
1201 key_length, is_export ? "export" : "domestic", 0 );
1208 tls_seed_PRNG( const char *randfile )
1210 #ifndef URANDOM_DEVICE
1211 /* no /dev/urandom (or equiv) */
1213 char buffer[MAXPATHLEN];
1215 if (randfile == NULL) {
1216 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
1217 * If $HOME is not set or buffer too small to hold the pathname,
1218 * an error occurs. - From RAND_file_name() man page.
1219 * The fact is that when $HOME is NULL, .rnd is used.
1221 randfile = RAND_file_name( buffer, sizeof( buffer ) );
1223 } else if (RAND_egd(randfile) > 0) {
1228 if (randfile == NULL) {
1229 Debug( LDAP_DEBUG_ANY,
1230 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
1235 total = RAND_load_file(randfile, -1);
1237 if (RAND_status() == 0) {
1238 Debug( LDAP_DEBUG_ANY,
1239 "TLS: PRNG not been seeded with enough data\n",
1244 /* assume if there was enough bits to seed that it's okay
1245 * to write derived bits to the file
1247 RAND_write_file(randfile);
1256 tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
1264 ldap_start_tls_s ( LDAP *ld,
1265 LDAPControl **serverctrls,
1266 LDAPControl **clientctrls )
1271 char *rspoid = NULL;
1272 struct berval *rspdata = NULL;
1274 /* XXYYZ: this initiates operation only on default connection! */
1276 if ( ldap_pvt_tls_inplace( ld->ld_sb ) != 0 ) {
1277 return LDAP_LOCAL_ERROR;
1280 rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS,
1281 NULL, serverctrls, clientctrls, &rspoid, &rspdata );
1282 if ( rc != LDAP_SUCCESS ) {
1286 if ( rspoid != NULL ) {
1290 if ( rspdata != NULL ) {
1291 ber_bvfree( rspdata );
1294 rc = ldap_int_tls_start( ld, ld->ld_defconn, NULL );
1296 rc = LDAP_NOT_SUPPORTED;