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 ) )
148 Debug( LDAP_DEBUG_ANY,
149 "TLS: could not set cipher list %s.\n",
150 tls_opt_ciphersuite, 0, 0 );
154 if (tls_opt_cacertfile != NULL || tls_opt_cacertdir != NULL) {
155 if ( !SSL_CTX_load_verify_locations( tls_def_ctx,
158 || !SSL_CTX_set_default_verify_paths( tls_def_ctx ) )
160 Debug( LDAP_DEBUG_ANY, "TLS: "
161 "could not load verify locations (file:`%s',dir:`%s').\n",
162 tls_opt_cacertfile ? tls_opt_cacertfile : "",
163 tls_opt_cacertdir ? tls_opt_cacertdir : "",
168 calist = get_ca_list( tls_opt_cacertfile, tls_opt_cacertdir );
170 Debug( LDAP_DEBUG_ANY, "TLS: "
171 "could not load client CA list (file:`%s',dir:`%s').\n",
172 tls_opt_cacertfile ? tls_opt_cacertfile : "",
173 tls_opt_cacertdir ? tls_opt_cacertdir : "",
178 SSL_CTX_set_client_CA_list( tls_def_ctx, calist );
180 if ( tls_opt_keyfile &&
181 !SSL_CTX_use_PrivateKey_file( tls_def_ctx,
185 Debug( LDAP_DEBUG_ANY,
186 "TLS: could not use key file `%s'.\n",
187 tls_opt_keyfile,0,0);
191 if ( tls_opt_certfile &&
192 !SSL_CTX_use_certificate_file( tls_def_ctx,
196 Debug( LDAP_DEBUG_ANY,
197 "TLS: could not use certificate `%s'.\n",
198 tls_opt_certfile,0,0);
202 if ( ( tls_opt_certfile || tls_opt_keyfile ) &&
203 !SSL_CTX_check_private_key( tls_def_ctx ) )
205 Debug( LDAP_DEBUG_ANY,
206 "TLS: private key mismatch.\n",
211 if ( tls_opt_trace ) {
212 SSL_CTX_set_info_callback( tls_def_ctx, tls_info_cb );
214 SSL_CTX_set_verify( tls_def_ctx,
215 tls_opt_require_cert ?
216 (SSL_VERIFY_PEER|SSL_VERIFY_FAIL_IF_NO_PEER_CERT) :
219 SSL_CTX_set_tmp_rsa_callback( tls_def_ctx, tls_tmp_rsa_cb );
220 /* SSL_CTX_set_tmp_dh_callback( tls_def_ctx, tls_tmp_dh_cb ); */
222 #ifdef LDAP_R_COMPILE
223 ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
227 if ( tls_def_ctx != NULL ) {
228 SSL_CTX_free( tls_def_ctx );
231 #ifdef LDAP_R_COMPILE
232 ldap_pvt_thread_mutex_unlock( &tls_def_ctx_mutex );
237 static STACK_OF(X509_NAME) *
238 get_ca_list( char * bundle, char * dir )
240 STACK_OF(X509_NAME) *ca_list = NULL;
243 ca_list = SSL_load_client_CA_file( bundle );
246 * FIXME: We have now to go over all files in dir, load them
247 * and add every certificate there to ca_list.
253 alloc_handle( void *ctx_arg )
259 ctx = (SSL_CTX *) ctx_arg;
261 if ( ldap_pvt_tls_init_def_ctx() < 0 ) return NULL;
265 ssl = SSL_new( ctx );
267 Debug( LDAP_DEBUG_ANY,"TLS: can't create ssl handle.\n",0,0,0);
274 update_flags( Sockbuf *sb, SSL * ssl, int rc )
276 int err = SSL_get_error(ssl, rc);
278 sb->sb_trans_needs_read = 0;
279 sb->sb_trans_needs_write = 0;
280 if (err == SSL_ERROR_WANT_READ)
282 sb->sb_trans_needs_read = 1;
284 } else if (err == SSL_ERROR_WANT_WRITE)
286 sb->sb_trans_needs_write = 1;
288 } else if (err == SSL_ERROR_WANT_CONNECT)
296 * TLS support for LBER Sockbufs
301 Sockbuf_IO_Desc *sbiod;
304 extern BIO_METHOD ldap_pvt_sb_bio_method;
307 sb_tls_setup( Sockbuf_IO_Desc *sbiod, void *arg )
312 assert( sbiod != NULL );
314 p = LBER_MALLOC( sizeof( *p ) );
320 bio = BIO_new( &ldap_pvt_sb_bio_method );
321 bio->ptr = (void *)p;
322 SSL_set_bio( p->ssl, bio, bio );
323 sbiod->sbiod_pvt = p;
328 sb_tls_remove( Sockbuf_IO_Desc *sbiod )
332 assert( sbiod != NULL );
333 assert( sbiod->sbiod_pvt != NULL );
335 p = (struct tls_data *)sbiod->sbiod_pvt;
337 LBER_FREE( sbiod->sbiod_pvt );
338 sbiod->sbiod_pvt = NULL;
343 sb_tls_close( Sockbuf_IO_Desc *sbiod )
347 assert( sbiod != NULL );
348 assert( sbiod->sbiod_pvt != NULL );
350 p = (struct tls_data *)sbiod->sbiod_pvt;
351 SSL_shutdown( p->ssl );
356 sb_tls_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
360 assert( sbiod != NULL );
361 assert( sbiod->sbiod_pvt != NULL );
363 p = (struct tls_data *)sbiod->sbiod_pvt;
365 if ( opt == LBER_SB_OPT_GET_SSL ) {
366 *((SSL **)arg) = p->ssl;
369 } else if ( opt == LBER_SB_OPT_DATA_READY ) {
370 if( SSL_pending( p->ssl ) > 0 ) {
375 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
379 sb_tls_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
385 assert( sbiod != NULL );
386 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
388 p = (struct tls_data *)sbiod->sbiod_pvt;
390 ret = SSL_read( p->ssl, (char *)buf, len );
392 errno = WSAGetLastError();
394 err = SSL_get_error( p->ssl, ret );
395 if (err == SSL_ERROR_WANT_READ ) {
396 sbiod->sbiod_sb->sb_trans_needs_read = 1;
402 sbiod->sbiod_sb->sb_trans_needs_read = 0;
407 sb_tls_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
413 assert( sbiod != NULL );
414 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
416 p = (struct tls_data *)sbiod->sbiod_pvt;
418 ret = SSL_write( p->ssl, (char *)buf, len );
420 errno = WSAGetLastError();
422 err = SSL_get_error( p->ssl, ret );
423 if (err == SSL_ERROR_WANT_WRITE ) {
424 sbiod->sbiod_sb->sb_trans_needs_write = 1;
430 sbiod->sbiod_sb->sb_trans_needs_write = 0;
434 Sockbuf_IO ldap_pvt_sockbuf_io_tls =
436 sb_tls_setup, /* sbi_setup */
437 sb_tls_remove, /* sbi_remove */
438 sb_tls_ctrl, /* sbi_ctrl */
439 sb_tls_read, /* sbi_read */
440 sb_tls_write, /* sbi_write */
441 sb_tls_close /* sbi_close */
445 sb_tls_bio_create( BIO *b ) {
454 sb_tls_bio_destroy( BIO *b )
459 b->ptr = NULL; /* sb_tls_remove() will free it */
466 sb_tls_bio_read( BIO *b, char *buf, int len )
471 if ( buf == NULL || len <= 0 )
474 p = (struct tls_data *)b->ptr;
476 if ( p == NULL || p->sbiod == NULL )
479 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
481 BIO_clear_retry_flags( b );
482 if ( ret < 0 && errno == EWOULDBLOCK )
483 BIO_set_retry_read( b );
489 sb_tls_bio_write( BIO *b, const char *buf, int len )
494 if ( buf == NULL || len <= 0 )
497 p = (struct tls_data *)b->ptr;
499 if ( p == NULL || p->sbiod == NULL )
502 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
504 BIO_clear_retry_flags( b );
505 if ( ret < 0 && errno == EWOULDBLOCK )
506 BIO_set_retry_write( b );
512 sb_tls_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
514 if ( cmd == BIO_CTRL_FLUSH ) {
515 /* The OpenSSL library needs this */
522 sb_tls_bio_gets( BIO *b, char *buf, int len )
528 sb_tls_bio_puts( BIO *b, const char *str )
530 return sb_tls_bio_write( b, str, strlen( str ) );
533 BIO_METHOD ldap_pvt_sb_bio_method =
535 ( 100 | 0x400 ), /* it's a source/sink BIO */
547 * Call this to do a TLS connect on a sockbuf. ctx_arg can be
548 * a SSL_CTX * or NULL, in which case the default ctx is used.
552 * 0 - Success. Connection is ready for communication.
553 * <0 - Error. Can't create a TLS stream.
554 * >0 - Partial success.
555 * Do a select (using information from lber_pvt_sb_needs_{read,write}
560 ldap_int_tls_connect( LDAP *ld, LDAPConn *conn )
562 Sockbuf *sb = conn->lconn_sb;
566 if ( HAS_TLS( sb ) ) {
567 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
570 void *ctx = ld->ld_defconn
571 ? ld->ld_defconn->lconn_tls_ctx : NULL;
573 ssl = alloc_handle( ctx );
575 if ( ssl == NULL ) return -1;
578 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
579 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
581 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
582 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
585 conn->lconn_tls_ctx = tls_def_ctx;
589 err = SSL_connect( ssl );
592 errno = WSAGetLastError();
595 if ( update_flags( sb, ssl, err )) {
598 if ((err = ERR_peek_error())) {
600 ld->ld_error = LDAP_STRDUP(ERR_error_string(err, buf));
602 Debug( LDAP_DEBUG_ANY,"TLS: can't connect.\n",0,0,0);
603 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
604 LBER_SBIOD_LEVEL_TRANSPORT );
606 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
607 LBER_SBIOD_LEVEL_TRANSPORT );
616 * Call this to do a TLS accept on a sockbuf.
617 * Everything else is the same as with tls_connect.
620 ldap_pvt_tls_accept( Sockbuf *sb, void *ctx_arg )
625 if ( HAS_TLS( sb ) ) {
626 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&ssl );
628 ssl = alloc_handle( ctx_arg );
632 ber_sockbuf_add_io( sb, &ber_sockbuf_io_debug,
633 LBER_SBIOD_LEVEL_TRANSPORT, (void *)"tls_" );
635 ber_sockbuf_add_io( sb, &ldap_pvt_sockbuf_io_tls,
636 LBER_SBIOD_LEVEL_TRANSPORT, (void *)ssl );
639 err = SSL_accept( ssl );
642 errno = WSAGetLastError();
645 if ( update_flags( sb, ssl, err ))
647 Debug( LDAP_DEBUG_ANY,"TLS: can't accept.\n",0,0,0 );
649 ber_sockbuf_remove_io( sb, &ldap_pvt_sockbuf_io_tls,
650 LBER_SBIOD_LEVEL_TRANSPORT );
652 ber_sockbuf_remove_io( sb, &ber_sockbuf_io_debug,
653 LBER_SBIOD_LEVEL_TRANSPORT );
662 ldap_pvt_tls_inplace ( Sockbuf *sb )
670 ldap_pvt_tls_sb_ctx( Sockbuf *sb )
675 ber_sockbuf_ctrl( sb, LBER_SB_OPT_GET_SSL, (void *)&p );
683 ldap_pvt_tls_get_strength( void *s )
687 c = SSL_get_current_cipher((SSL *)s);
688 return SSL_CIPHER_get_bits(c, NULL);
693 ldap_pvt_tls_get_peer( void *s )
699 x = SSL_get_peer_certificate((SSL *)s);
704 xn = X509_get_subject_name(x);
705 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
711 ldap_pvt_tls_get_peer_dn( void *s )
715 char buf[2048], *p, *dn;
717 x = SSL_get_peer_certificate((SSL *)s);
721 xn = X509_get_subject_name(x);
722 p = X509_NAME_oneline(xn, buf, sizeof(buf));
724 dn = ldap_dcedn2dn( p );
731 ldap_pvt_tls_get_peer_hostname( void *s )
738 x = SSL_get_peer_certificate((SSL *)s);
743 xn = X509_get_subject_name(x);
745 ret = X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf));
751 p = LDAP_STRDUP(buf);
757 ldap_pvt_tls_check_hostname( void *s, char *name )
759 int i, ret = LDAP_LOCAL_ERROR;
762 x = SSL_get_peer_certificate((SSL *)s);
765 Debug( LDAP_DEBUG_ANY,
766 "TLS: unable to get peer certificate.\n",
771 i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
775 STACK_OF(GENERAL_NAME) *alt;
777 ex = X509_get_ext(x, i);
778 alt = X509V3_EXT_d2i(ex);
784 X509V3_EXT_METHOD *method;
787 n = sk_GENERAL_NAME_num(alt);
788 domain = strchr(name, '.');
790 len2 = len1 - (domain-name);
793 gn = sk_GENERAL_NAME_value(alt, i);
794 if (gn->type == GEN_DNS)
796 char *sn = ASN1_STRING_data(gn->d.ia5);
797 int sl = ASN1_STRING_length(gn->d.ia5);
799 /* Is this an exact match? */
800 if ((len1 == sl) && !strncasecmp(name, sn, len1))
803 /* Is this a wildcard match? */
804 if ((*sn == '*') && domain && (len2 == sl-1) &&
805 !strncasecmp(domain, sn+1, len2))
809 method = X509V3_EXT_get(ex);
810 method->ext_free(alt);
811 if (i < n) /* Found a match */
816 if (ret != LDAP_SUCCESS)
821 xn = X509_get_subject_name(x);
823 if (X509_NAME_get_text_by_NID(xn, NID_commonName, buf, sizeof(buf))
826 Debug( LDAP_DEBUG_ANY,
827 "TLS: unable to get common name from peer certificate.\n",
829 } else if (strcasecmp(name, buf))
831 Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
832 "common name in certificate (%s).\n",
834 ret = LDAP_CONNECT_ERROR;
845 ldap_pvt_tls_get_peer_issuer( void *s )
847 #if 0 /* currently unused; see ldap_pvt_tls_get_peer() if needed */
852 x = SSL_get_peer_certificate((SSL *)s);
857 xn = X509_get_issuer_name(x);
858 p = LDAP_STRDUP(X509_NAME_oneline(xn, buf, sizeof(buf)));
867 ldap_int_tls_config( LDAP *ld, int option, const char *arg )
872 case LDAP_OPT_X_TLS_CACERTFILE:
873 case LDAP_OPT_X_TLS_CACERTDIR:
874 case LDAP_OPT_X_TLS_CERTFILE:
875 case LDAP_OPT_X_TLS_KEYFILE:
876 case LDAP_OPT_X_TLS_RANDOM_FILE:
877 return ldap_pvt_tls_set_option( ld, option, (void *) arg );
879 case LDAP_OPT_X_TLS_REQUIRE_CERT:
880 i = ( ( strcasecmp( arg, "on" ) == 0 ) ||
881 ( strcasecmp( arg, "yes" ) == 0) ||
882 ( strcasecmp( arg, "true" ) == 0 ) );
883 return ldap_pvt_tls_set_option( ld, option, (void *) &i );
887 if ( strcasecmp( arg, "never" ) == 0 )
888 i = LDAP_OPT_X_TLS_NEVER ;
889 if ( strcasecmp( arg, "demand" ) == 0 )
890 i = LDAP_OPT_X_TLS_DEMAND ;
891 if ( strcasecmp( arg, "allow" ) == 0 )
892 i = LDAP_OPT_X_TLS_ALLOW ;
893 if ( strcasecmp( arg, "try" ) == 0 )
894 i = LDAP_OPT_X_TLS_TRY ;
895 if ( strcasecmp( arg, "hard" ) == 0 )
896 i = LDAP_OPT_X_TLS_HARD ;
899 return ldap_pvt_tls_set_option( ld, option, &i );
908 ldap_pvt_tls_get_option( LDAP *ld, int option, void *arg )
910 struct ldapoptions *lo;
913 assert( LDAP_VALID( ld ) );
915 if( !LDAP_VALID( ld ) ) {
916 return LDAP_OPT_ERROR;
919 lo = &ld->ld_options;
922 /* Get pointer to global option structure */
923 lo = LDAP_INT_GLOBAL_OPT();
925 return LDAP_NO_MEMORY;
931 *(int *)arg = lo->ldo_tls_mode;
933 case LDAP_OPT_X_TLS_CTX:
935 *(void **)arg = (void *) tls_def_ctx;
937 *(void **)arg = ld->ld_defconn->lconn_tls_ctx;
939 case LDAP_OPT_X_TLS_CACERTFILE:
940 *(char **)arg = tls_opt_cacertfile ?
941 LDAP_STRDUP( tls_opt_cacertfile ) : NULL;
943 case LDAP_OPT_X_TLS_CACERTDIR:
944 *(char **)arg = tls_opt_cacertdir ?
945 LDAP_STRDUP( tls_opt_cacertdir ) : NULL;
947 case LDAP_OPT_X_TLS_CERTFILE:
948 *(char **)arg = tls_opt_certfile ?
949 LDAP_STRDUP( tls_opt_certfile ) : NULL;
951 case LDAP_OPT_X_TLS_KEYFILE:
952 *(char **)arg = tls_opt_keyfile ?
953 LDAP_STRDUP( tls_opt_keyfile ) : NULL;
955 case LDAP_OPT_X_TLS_REQUIRE_CERT:
956 *(int *)arg = tls_opt_require_cert;
958 case LDAP_OPT_X_TLS_RANDOM_FILE:
959 *(char **)arg = tls_opt_randfile;
968 ldap_pvt_tls_set_option( LDAP *ld, int option, void *arg )
970 struct ldapoptions *lo;
973 assert( LDAP_VALID( ld ) );
975 if( !LDAP_VALID( ld ) ) {
976 return LDAP_OPT_ERROR;
979 lo = &ld->ld_options;
982 /* Get pointer to global option structure */
983 lo = LDAP_INT_GLOBAL_OPT();
985 return LDAP_NO_MEMORY;
991 switch( *(int *) arg ) {
992 case LDAP_OPT_X_TLS_NEVER:
993 case LDAP_OPT_X_TLS_DEMAND:
994 case LDAP_OPT_X_TLS_ALLOW:
995 case LDAP_OPT_X_TLS_TRY:
996 case LDAP_OPT_X_TLS_HARD:
998 lo->ldo_tls_mode = *(int *)arg;
1005 case LDAP_OPT_X_TLS_CTX:
1007 tls_def_ctx = (SSL_CTX *) arg;
1010 ld->ld_defconn->lconn_tls_ctx = arg;
1020 case LDAP_OPT_X_TLS_CACERTFILE:
1021 if ( tls_opt_cacertfile ) LDAP_FREE( tls_opt_cacertfile );
1022 tls_opt_cacertfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1024 case LDAP_OPT_X_TLS_CACERTDIR:
1025 if ( tls_opt_cacertdir ) LDAP_FREE( tls_opt_cacertdir );
1026 tls_opt_cacertdir = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1028 case LDAP_OPT_X_TLS_CERTFILE:
1029 if ( tls_opt_certfile ) LDAP_FREE( tls_opt_certfile );
1030 tls_opt_certfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1032 case LDAP_OPT_X_TLS_KEYFILE:
1033 if ( tls_opt_keyfile ) LDAP_FREE( tls_opt_keyfile );
1034 tls_opt_keyfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1036 case LDAP_OPT_X_TLS_REQUIRE_CERT:
1037 tls_opt_require_cert = * (int *) arg;
1039 case LDAP_OPT_X_TLS_CIPHER_SUITE:
1040 if ( tls_opt_ciphersuite ) LDAP_FREE( tls_opt_ciphersuite );
1041 tls_opt_ciphersuite = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1043 case LDAP_OPT_X_TLS_RANDOM_FILE:
1044 if (tls_opt_randfile ) LDAP_FREE (tls_opt_randfile );
1045 tls_opt_randfile = arg ? LDAP_STRDUP( (char *) arg ) : NULL;
1054 ldap_int_tls_start ( LDAP *ld, LDAPConn *conn, LDAPURLDesc *srv )
1056 Sockbuf *sb = conn->lconn_sb;
1061 host = srv->lud_host;
1063 host = conn->lconn_server->lud_host;
1066 /* avoid NULL host */
1067 if( host == NULL ) host = "localhost";
1069 (void) ldap_pvt_tls_init();
1072 * Fortunately, the lib uses blocking io...
1074 if ( ldap_int_tls_connect( ld, conn ) < 0 ) {
1075 ld->ld_errno = LDAP_CONNECT_ERROR;
1076 return (ld->ld_errno);
1079 ssl = (void *) ldap_pvt_tls_sb_ctx( sb );
1080 assert( ssl != NULL );
1083 * compare host with name(s) in certificate
1085 ld->ld_errno = ldap_pvt_tls_check_hostname( ssl, host );
1086 if (ld->ld_errno != LDAP_SUCCESS) {
1087 return ld->ld_errno;
1091 * set SASL properties to TLS ssf and authid
1097 /* we need to let SASL know */
1098 ssf = ldap_pvt_tls_get_strength( ssl );
1099 authid = ldap_pvt_tls_get_peer( ssl );
1101 (void) ldap_int_sasl_external( ld, conn, authid, ssf );
1104 return LDAP_SUCCESS;
1107 /* Derived from openssl/apps/s_cb.c */
1109 tls_info_cb( SSL *ssl, int where, int ret )
1114 w = where & ~SSL_ST_MASK;
1115 if ( w & SSL_ST_CONNECT ) {
1117 } else if ( w & SSL_ST_ACCEPT ) {
1123 if ( where & SSL_CB_LOOP ) {
1124 Debug( LDAP_DEBUG_TRACE,
1125 "TLS trace: %s:%s\n",
1126 op, SSL_state_string_long( ssl ), 0 );
1127 } else if ( where & SSL_CB_ALERT ) {
1128 op = ( where & SSL_CB_READ ) ? "read" : "write";
1129 Debug( LDAP_DEBUG_TRACE,
1130 "TLS trace: SSL3 alert %s:%s:%s\n",
1132 SSL_alert_type_string_long( ret ),
1133 SSL_alert_desc_string_long( ret) );
1134 } else if ( where & SSL_CB_EXIT ) {
1136 Debug( LDAP_DEBUG_TRACE,
1137 "TLS trace: %s:failed in %s\n",
1138 op, SSL_state_string_long( ssl ), 0 );
1139 } else if ( ret < 0 ) {
1140 Debug( LDAP_DEBUG_TRACE,
1141 "TLS trace: %s:error in %s\n",
1142 op, SSL_state_string_long( ssl ), 0 );
1148 tls_verify_cb( int ok, X509_STORE_CTX *ctx )
1158 cert = X509_STORE_CTX_get_current_cert( ctx );
1159 errnum = X509_STORE_CTX_get_error( ctx );
1160 errdepth = X509_STORE_CTX_get_error_depth( ctx );
1163 * X509_get_*_name return pointers to the internal copies of
1164 * those things requested. So do not free them.
1166 subject = X509_get_subject_name( cert );
1167 issuer = X509_get_issuer_name( cert );
1168 /* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
1169 sname = X509_NAME_oneline( subject, NULL, 0 );
1170 iname = X509_NAME_oneline( issuer, NULL, 0 );
1171 Debug( LDAP_DEBUG_TRACE,
1172 "TLS certificate verification: depth: %d, subject: %s, issuer: %s\n",
1174 sname ? sname : "-unknown-",
1175 iname ? iname : "-unknown-" );
1177 CRYPTO_free ( sname );
1179 CRYPTO_free ( iname );
1184 /* Inspired by ERR_print_errors in OpenSSL */
1186 tls_report_error( void )
1193 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
1194 Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
1195 ERR_error_string( l, buf ), file, line );
1200 tls_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
1204 /* FIXME: Pregenerate the key on startup */
1205 /* FIXME: Who frees the key? */
1206 tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
1209 Debug( LDAP_DEBUG_ANY,
1210 "TLS: Failed to generate temporary %d-bit %s RSA key\n",
1211 key_length, is_export ? "export" : "domestic", 0 );
1218 tls_seed_PRNG( const char *randfile )
1220 #ifndef URANDOM_DEVICE
1221 /* no /dev/urandom (or equiv) */
1223 char buffer[MAXPATHLEN];
1225 if (randfile == NULL) {
1226 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
1227 * If $HOME is not set or buffer too small to hold the pathname,
1228 * an error occurs. - From RAND_file_name() man page.
1229 * The fact is that when $HOME is NULL, .rnd is used.
1231 randfile = RAND_file_name( buffer, sizeof( buffer ) );
1233 } else if (RAND_egd(randfile) > 0) {
1238 if (randfile == NULL) {
1239 Debug( LDAP_DEBUG_ANY,
1240 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
1245 total = RAND_load_file(randfile, -1);
1247 if (RAND_status() == 0) {
1248 Debug( LDAP_DEBUG_ANY,
1249 "TLS: PRNG not been seeded with enough data\n",
1254 /* assume if there was enough bits to seed that it's okay
1255 * to write derived bits to the file
1257 RAND_write_file(randfile);
1266 tls_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
1274 ldap_start_tls_s ( LDAP *ld,
1275 LDAPControl **serverctrls,
1276 LDAPControl **clientctrls )
1281 char *rspoid = NULL;
1282 struct berval *rspdata = NULL;
1284 /* XXYYZ: this initiates operation only on default connection! */
1286 if ( ldap_pvt_tls_inplace( ld->ld_sb ) != 0 ) {
1287 return LDAP_LOCAL_ERROR;
1290 rc = ldap_extended_operation_s( ld, LDAP_EXOP_START_TLS,
1291 NULL, serverctrls, clientctrls, &rspoid, &rspdata );
1292 if ( rc != LDAP_SUCCESS ) {
1296 if ( rspoid != NULL ) {
1300 if ( rspdata != NULL ) {
1301 ber_bvfree( rspdata );
1304 rc = ldap_int_tls_start( ld, ld->ld_defconn, NULL );
1306 rc = LDAP_NOT_SUPPORTED;