1 /* tls_o.c - Handle tls/ssl using OpenSSL */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
5 * Copyright 2008-2013 The OpenLDAP Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
12 * A copy of this license is available in the file LICENSE in the
13 * top-level directory of the distribution or, alternatively, at
14 * <http://www.OpenLDAP.org/license.html>.
16 /* ACKNOWLEDGEMENTS: Rewritten by Howard Chu
23 #include "ldap_config.h"
27 #include <ac/stdlib.h>
29 #include <ac/socket.h>
30 #include <ac/string.h>
33 #include <ac/unistd.h>
35 #include <ac/dirent.h>
40 #ifdef HAVE_OPENSSL_SSL_H
41 #include <openssl/ssl.h>
42 #include <openssl/x509v3.h>
43 #include <openssl/err.h>
44 #include <openssl/rand.h>
45 #include <openssl/safestack.h>
46 #elif defined( HAVE_SSL_H )
50 typedef SSL_CTX tlso_ctx;
51 typedef SSL tlso_session;
53 static int tlso_opt_trace = 1;
55 static void tlso_report_error( void );
57 static void tlso_info_cb( const SSL *ssl, int where, int ret );
58 static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx );
59 static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx );
60 static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
62 static DH * tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length );
64 typedef struct dhplist {
70 static dhplist *tlso_dhparams;
72 static int tlso_seed_PRNG( const char *randfile );
76 * provide mutexes for the OpenSSL library.
78 static ldap_pvt_thread_mutex_t tlso_mutexes[CRYPTO_NUM_LOCKS];
79 static ldap_pvt_thread_mutex_t tlso_dh_mutex;
81 static void tlso_locking_cb( int mode, int type, const char *file, int line )
83 if ( mode & CRYPTO_LOCK ) {
84 ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] );
86 ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] );
90 static unsigned long tlso_thread_self( void )
92 /* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t
93 * is an integral type that fits in an unsigned long
96 /* force an error if the ldap_pvt_thread_t type is too large */
97 enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) };
98 typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1];
100 return (unsigned long) ldap_pvt_thread_self();
103 static void tlso_thr_init( void )
107 for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
108 ldap_pvt_thread_mutex_init( &tlso_mutexes[i] );
110 ldap_pvt_thread_mutex_init( &tlso_dh_mutex );
111 CRYPTO_set_locking_callback( tlso_locking_cb );
112 CRYPTO_set_id_callback( tlso_thread_self );
114 #endif /* LDAP_R_COMPILE */
116 static STACK_OF(X509_NAME) *
117 tlso_ca_list( char * bundle, char * dir )
119 STACK_OF(X509_NAME) *ca_list = NULL;
122 ca_list = SSL_load_client_CA_file( bundle );
124 #if defined(HAVE_DIRENT_H) || defined(dirent)
129 ca_list = sk_X509_NAME_new_null();
132 if ( !SSL_add_dir_cert_subjects_to_stack( ca_list, dir ) &&
134 sk_X509_NAME_free( ca_list );
143 * Initialize TLS subsystem. Should be called only once.
148 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
151 char *file = LDAP_STRDUP( lo->ldo_tls_randfile );
152 if ( file ) __atoe( file );
153 (void) tlso_seed_PRNG( file );
157 (void) tlso_seed_PRNG( lo->ldo_tls_randfile );
160 SSL_load_error_strings();
162 OpenSSL_add_all_digests();
164 /* FIXME: mod_ssl does this */
165 X509V3_add_standard_extensions();
171 * Tear down the TLS subsystem. Should only be called once.
176 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
182 if ( lo->ldo_tls_randfile ) {
183 LDAP_FREE( lo->ldo_tls_randfile );
184 lo->ldo_tls_randfile = NULL;
189 tlso_ctx_new( struct ldapoptions *lo )
191 return (tls_ctx *) SSL_CTX_new( SSLv23_method() );
195 tlso_ctx_ref( tls_ctx *ctx )
197 tlso_ctx *c = (tlso_ctx *)ctx;
198 CRYPTO_add( &c->references, 1, CRYPTO_LOCK_SSL_CTX );
202 tlso_ctx_free ( tls_ctx *ctx )
204 tlso_ctx *c = (tlso_ctx *)ctx;
209 * initialize a new TLS context
212 tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server )
214 tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx;
218 SSL_CTX_set_session_id_context( ctx,
219 (const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
222 #ifdef SSL_OP_NO_TLSv1
223 #ifdef SSL_OP_NO_TLSv1_1
224 #ifdef SSL_OP_NO_TLSv1_2
225 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_2)
226 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
227 SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 |
231 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_1)
232 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
233 SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1 );
236 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_0)
237 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
241 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
242 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 );
243 else if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 )
244 SSL_CTX_set_options( ctx, SSL_OP_NO_SSLv2 );
246 if ( lo->ldo_tls_ciphersuite &&
247 !SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) )
249 Debug( LDAP_DEBUG_ANY,
250 "TLS: could not set cipher list %s.\n",
251 lo->ldo_tls_ciphersuite, 0, 0 );
256 if (lo->ldo_tls_cacertfile != NULL || lo->ldo_tls_cacertdir != NULL) {
257 if ( !SSL_CTX_load_verify_locations( ctx,
258 lt->lt_cacertfile, lt->lt_cacertdir ) ||
259 !SSL_CTX_set_default_verify_paths( ctx ) )
261 Debug( LDAP_DEBUG_ANY, "TLS: "
262 "could not load verify locations (file:`%s',dir:`%s').\n",
263 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
264 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
271 STACK_OF(X509_NAME) *calist;
272 /* List of CA names to send to a client */
273 calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir );
275 Debug( LDAP_DEBUG_ANY, "TLS: "
276 "could not load client CA list (file:`%s',dir:`%s').\n",
277 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
278 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "",
284 SSL_CTX_set_client_CA_list( ctx, calist );
288 if ( lo->ldo_tls_certfile &&
289 !SSL_CTX_use_certificate_file( ctx,
290 lt->lt_certfile, SSL_FILETYPE_PEM ) )
292 Debug( LDAP_DEBUG_ANY,
293 "TLS: could not use certificate `%s'.\n",
294 lo->ldo_tls_certfile,0,0);
299 /* Key validity is checked automatically if cert has already been set */
300 if ( lo->ldo_tls_keyfile &&
301 !SSL_CTX_use_PrivateKey_file( ctx,
302 lt->lt_keyfile, SSL_FILETYPE_PEM ) )
304 Debug( LDAP_DEBUG_ANY,
305 "TLS: could not use key file `%s'.\n",
306 lo->ldo_tls_keyfile,0,0);
311 if ( lo->ldo_tls_dhfile ) {
316 if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
317 Debug( LDAP_DEBUG_ANY,
318 "TLS: could not use DH parameters file `%s'.\n",
319 lo->ldo_tls_dhfile,0,0);
323 while (( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
324 p = LDAP_MALLOC( sizeof(dhplist) );
326 p->keylength = DH_size( dh ) * 8;
328 p->next = tlso_dhparams;
335 if ( tlso_opt_trace ) {
336 SSL_CTX_set_info_callback( ctx, tlso_info_cb );
340 if ( lo->ldo_tls_require_cert ) {
342 if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
343 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) {
344 i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
348 SSL_CTX_set_verify( ctx, i,
349 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
350 tlso_verify_ok : tlso_verify_cb );
351 SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
352 if ( lo->ldo_tls_dhfile ) {
353 SSL_CTX_set_tmp_dh_callback( ctx, tlso_tmp_dh_cb );
355 #ifdef HAVE_OPENSSL_CRL
356 if ( lo->ldo_tls_crlcheck ) {
357 X509_STORE *x509_s = SSL_CTX_get_cert_store( ctx );
358 if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) {
359 X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK );
360 } else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) {
361 X509_STORE_set_flags( x509_s,
362 X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL );
370 tlso_session_new( tls_ctx *ctx, int is_server )
372 tlso_ctx *c = (tlso_ctx *)ctx;
373 return (tls_session *)SSL_new( c );
377 tlso_session_connect( LDAP *ld, tls_session *sess )
379 tlso_session *s = (tlso_session *)sess;
381 /* Caller expects 0 = success, OpenSSL returns 1 = success */
382 return SSL_connect( s ) - 1;
386 tlso_session_accept( tls_session *sess )
388 tlso_session *s = (tlso_session *)sess;
390 /* Caller expects 0 = success, OpenSSL returns 1 = success */
391 return SSL_accept( s ) - 1;
395 tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc )
397 tlso_session *s = (tlso_session *)sess;
399 /* 1 was subtracted above, offset it back now */
400 rc = SSL_get_error(s, rc+1);
401 if (rc == SSL_ERROR_WANT_READ) {
402 sb->sb_trans_needs_read = 1;
405 } else if (rc == SSL_ERROR_WANT_WRITE) {
406 sb->sb_trans_needs_write = 1;
409 } else if (rc == SSL_ERROR_WANT_CONNECT) {
416 tlso_session_errmsg( tls_session *sess, int rc, char *buf, size_t len )
419 const char *certerr=NULL;
420 tlso_session *s = (tlso_session *)sess;
422 rc = ERR_peek_error();
424 ERR_error_string_n( rc, err, sizeof(err) );
425 if ( ( ERR_GET_LIB(rc) == ERR_LIB_SSL ) &&
426 ( ERR_GET_REASON(rc) == SSL_R_CERTIFICATE_VERIFY_FAILED ) ) {
427 int certrc = SSL_get_verify_result(s);
428 certerr = (char *)X509_verify_cert_error_string(certrc);
430 snprintf(buf, len, "%s%s%s%s", err, certerr ? " (" :"",
431 certerr ? certerr : "", certerr ? ")" : "" );
438 tlso_session_my_dn( tls_session *sess, struct berval *der_dn )
440 tlso_session *s = (tlso_session *)sess;
444 x = SSL_get_certificate( s );
446 if (!x) return LDAP_INVALID_CREDENTIALS;
448 xn = X509_get_subject_name(x);
449 der_dn->bv_len = i2d_X509_NAME( xn, NULL );
450 der_dn->bv_val = xn->bytes->data;
451 /* Don't X509_free, the session is still using it */
456 tlso_get_cert( SSL *s )
458 /* If peer cert was bad, treat as if no cert was given */
459 if (SSL_get_verify_result(s)) {
462 return SSL_get_peer_certificate(s);
466 tlso_session_peer_dn( tls_session *sess, struct berval *der_dn )
468 tlso_session *s = (tlso_session *)sess;
469 X509 *x = tlso_get_cert( s );
473 return LDAP_INVALID_CREDENTIALS;
475 xn = X509_get_subject_name(x);
476 der_dn->bv_len = i2d_X509_NAME( xn, NULL );
477 der_dn->bv_val = xn->bytes->data;
482 /* what kind of hostname were we given? */
488 tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in )
490 tlso_session *s = (tlso_session *)sess;
491 int i, ret = LDAP_LOCAL_ERROR;
495 int ntype = IS_DNS, nlen;
497 struct in6_addr addr;
502 if( ldap_int_hostname &&
503 ( !name_in || !strcasecmp( name_in, "localhost" ) ) )
505 name = ldap_int_hostname;
511 x = tlso_get_cert(s);
513 Debug( LDAP_DEBUG_ANY,
514 "TLS: unable to get peer certificate.\n",
516 /* If this was a fatal condition, things would have
517 * aborted long before now.
523 if (inet_pton(AF_INET6, name, &addr)) {
527 if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
528 if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
531 i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
534 STACK_OF(GENERAL_NAME) *alt;
536 ex = X509_get_ext(x, i);
537 alt = X509V3_EXT_d2i(ex);
543 if (ntype == IS_DNS) {
544 domain = strchr(name, '.');
546 len2 = nlen - (domain-name);
549 n = sk_GENERAL_NAME_num(alt);
550 for (i=0; i<n; i++) {
553 gn = sk_GENERAL_NAME_value(alt, i);
554 if (gn->type == GEN_DNS) {
555 if (ntype != IS_DNS) continue;
557 sn = (char *) ASN1_STRING_data(gn->d.ia5);
558 sl = ASN1_STRING_length(gn->d.ia5);
561 if (sl == 0) continue;
563 /* Is this an exact match? */
564 if ((nlen == sl) && !strncasecmp(name, sn, nlen)) {
568 /* Is this a wildcard match? */
569 if (domain && (sn[0] == '*') && (sn[1] == '.') &&
570 (len2 == sl-1) && !strncasecmp(domain, &sn[1], len2))
575 } else if (gn->type == GEN_IPADD) {
576 if (ntype == IS_DNS) continue;
578 sn = (char *) ASN1_STRING_data(gn->d.ia5);
579 sl = ASN1_STRING_length(gn->d.ia5);
582 if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) {
586 if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) {
589 if (!memcmp(sn, &addr, sl)) {
595 GENERAL_NAMES_free(alt);
596 if (i < n) { /* Found a match */
602 if (ret != LDAP_SUCCESS) {
606 ASN1_STRING *cn = NULL;
609 /* find the last CN */
610 obj = OBJ_nid2obj( NID_commonName );
611 if ( !obj ) goto no_cn; /* should never happen */
613 xn = X509_get_subject_name(x);
614 navas = X509_NAME_entry_count( xn );
615 for ( i=navas-1; i>=0; i-- ) {
616 ne = X509_NAME_get_entry( xn, i );
617 if ( !OBJ_cmp( ne->object, obj )) {
618 cn = X509_NAME_ENTRY_get_data( ne );
626 Debug( LDAP_DEBUG_ANY,
627 "TLS: unable to get common name from peer certificate.\n",
629 ret = LDAP_CONNECT_ERROR;
630 if ( ld->ld_error ) {
631 LDAP_FREE( ld->ld_error );
633 ld->ld_error = LDAP_STRDUP(
634 _("TLS: unable to get CN from peer certificate"));
636 } else if ( cn->length == nlen &&
637 strncasecmp( name, (char *) cn->data, nlen ) == 0 ) {
640 } else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) {
641 char *domain = strchr(name, '.');
645 dlen = nlen - (domain-name);
647 /* Is this a wildcard match? */
648 if ((dlen == cn->length-1) &&
649 !strncasecmp(domain, (char *) &cn->data[1], dlen)) {
655 if( ret == LDAP_LOCAL_ERROR ) {
656 Debug( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
657 "common name in certificate (%.*s).\n",
658 name, cn->length, cn->data );
659 ret = LDAP_CONNECT_ERROR;
660 if ( ld->ld_error ) {
661 LDAP_FREE( ld->ld_error );
663 ld->ld_error = LDAP_STRDUP(
664 _("TLS: hostname does not match CN in peer certificate"));
672 tlso_session_strength( tls_session *sess )
674 tlso_session *s = (tlso_session *)sess;
676 return SSL_CIPHER_get_bits(SSL_get_current_cipher(s), NULL);
680 tlso_session_unique( tls_session *sess, struct berval *buf, int is_server)
682 tlso_session *s = (tlso_session *)sess;
684 /* Usually the client sends the finished msg. But if the
685 * session was resumed, the server sent the msg.
687 if (SSL_session_reused(s) ^ !is_server)
688 buf->bv_len = SSL_get_finished(s, buf->bv_val, buf->bv_len);
690 buf->bv_len = SSL_get_peer_finished(s, buf->bv_val, buf->bv_len);
695 * TLS support for LBER Sockbufs
699 tlso_session *session;
700 Sockbuf_IO_Desc *sbiod;
704 tlso_bio_create( BIO *b ) {
713 tlso_bio_destroy( BIO *b )
715 if ( b == NULL ) return 0;
717 b->ptr = NULL; /* sb_tls_remove() will free it */
724 tlso_bio_read( BIO *b, char *buf, int len )
729 if ( buf == NULL || len <= 0 ) return 0;
731 p = (struct tls_data *)b->ptr;
733 if ( p == NULL || p->sbiod == NULL ) {
737 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
739 BIO_clear_retry_flags( b );
741 int err = sock_errno();
742 if ( err == EAGAIN || err == EWOULDBLOCK ) {
743 BIO_set_retry_read( b );
751 tlso_bio_write( BIO *b, const char *buf, int len )
756 if ( buf == NULL || len <= 0 ) return 0;
758 p = (struct tls_data *)b->ptr;
760 if ( p == NULL || p->sbiod == NULL ) {
764 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
766 BIO_clear_retry_flags( b );
768 int err = sock_errno();
769 if ( err == EAGAIN || err == EWOULDBLOCK ) {
770 BIO_set_retry_write( b );
778 tlso_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
780 if ( cmd == BIO_CTRL_FLUSH ) {
781 /* The OpenSSL library needs this */
788 tlso_bio_gets( BIO *b, char *buf, int len )
794 tlso_bio_puts( BIO *b, const char *str )
796 return tlso_bio_write( b, str, strlen( str ) );
799 static BIO_METHOD tlso_bio_method =
801 ( 100 | 0x400 ), /* it's a source/sink BIO */
813 tlso_sb_setup( Sockbuf_IO_Desc *sbiod, void *arg )
818 assert( sbiod != NULL );
820 p = LBER_MALLOC( sizeof( *p ) );
827 bio = BIO_new( &tlso_bio_method );
828 bio->ptr = (void *)p;
829 SSL_set_bio( p->session, bio, bio );
830 sbiod->sbiod_pvt = p;
835 tlso_sb_remove( Sockbuf_IO_Desc *sbiod )
839 assert( sbiod != NULL );
840 assert( sbiod->sbiod_pvt != NULL );
842 p = (struct tls_data *)sbiod->sbiod_pvt;
843 SSL_free( p->session );
844 LBER_FREE( sbiod->sbiod_pvt );
845 sbiod->sbiod_pvt = NULL;
850 tlso_sb_close( Sockbuf_IO_Desc *sbiod )
854 assert( sbiod != NULL );
855 assert( sbiod->sbiod_pvt != NULL );
857 p = (struct tls_data *)sbiod->sbiod_pvt;
858 SSL_shutdown( p->session );
863 tlso_sb_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
867 assert( sbiod != NULL );
868 assert( sbiod->sbiod_pvt != NULL );
870 p = (struct tls_data *)sbiod->sbiod_pvt;
872 if ( opt == LBER_SB_OPT_GET_SSL ) {
873 *((tlso_session **)arg) = p->session;
876 } else if ( opt == LBER_SB_OPT_DATA_READY ) {
877 if( SSL_pending( p->session ) > 0 ) {
882 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
886 tlso_sb_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
892 assert( sbiod != NULL );
893 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
895 p = (struct tls_data *)sbiod->sbiod_pvt;
897 ret = SSL_read( p->session, (char *)buf, len );
899 errno = WSAGetLastError();
901 err = SSL_get_error( p->session, ret );
902 if (err == SSL_ERROR_WANT_READ ) {
903 sbiod->sbiod_sb->sb_trans_needs_read = 1;
904 sock_errset(EWOULDBLOCK);
907 sbiod->sbiod_sb->sb_trans_needs_read = 0;
912 tlso_sb_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
918 assert( sbiod != NULL );
919 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
921 p = (struct tls_data *)sbiod->sbiod_pvt;
923 ret = SSL_write( p->session, (char *)buf, len );
925 errno = WSAGetLastError();
927 err = SSL_get_error( p->session, ret );
928 if (err == SSL_ERROR_WANT_WRITE ) {
929 sbiod->sbiod_sb->sb_trans_needs_write = 1;
930 sock_errset(EWOULDBLOCK);
933 sbiod->sbiod_sb->sb_trans_needs_write = 0;
938 static Sockbuf_IO tlso_sbio =
940 tlso_sb_setup, /* sbi_setup */
941 tlso_sb_remove, /* sbi_remove */
942 tlso_sb_ctrl, /* sbi_ctrl */
943 tlso_sb_read, /* sbi_read */
944 tlso_sb_write, /* sbi_write */
945 tlso_sb_close /* sbi_close */
948 /* Derived from openssl/apps/s_cb.c */
950 tlso_info_cb( const SSL *ssl, int where, int ret )
954 char *state = (char *) SSL_state_string_long( (SSL *)ssl );
956 w = where & ~SSL_ST_MASK;
957 if ( w & SSL_ST_CONNECT ) {
959 } else if ( w & SSL_ST_ACCEPT ) {
967 state = LDAP_STRDUP( state );
971 if ( where & SSL_CB_LOOP ) {
972 Debug( LDAP_DEBUG_TRACE,
973 "TLS trace: %s:%s\n",
976 } else if ( where & SSL_CB_ALERT ) {
977 char *atype = (char *) SSL_alert_type_string_long( ret );
978 char *adesc = (char *) SSL_alert_desc_string_long( ret );
979 op = ( where & SSL_CB_READ ) ? "read" : "write";
982 atype = LDAP_STRDUP( atype );
986 adesc = LDAP_STRDUP( adesc );
990 Debug( LDAP_DEBUG_TRACE,
991 "TLS trace: SSL3 alert %s:%s:%s\n",
994 if ( atype ) LDAP_FREE( atype );
995 if ( adesc ) LDAP_FREE( adesc );
997 } else if ( where & SSL_CB_EXIT ) {
999 Debug( LDAP_DEBUG_TRACE,
1000 "TLS trace: %s:failed in %s\n",
1002 } else if ( ret < 0 ) {
1003 Debug( LDAP_DEBUG_TRACE,
1004 "TLS trace: %s:error in %s\n",
1009 if ( state ) LDAP_FREE( state );
1014 tlso_verify_cb( int ok, X509_STORE_CTX *ctx )
1023 char *certerr = NULL;
1025 cert = X509_STORE_CTX_get_current_cert( ctx );
1026 errnum = X509_STORE_CTX_get_error( ctx );
1027 errdepth = X509_STORE_CTX_get_error_depth( ctx );
1030 * X509_get_*_name return pointers to the internal copies of
1031 * those things requested. So do not free them.
1033 subject = X509_get_subject_name( cert );
1034 issuer = X509_get_issuer_name( cert );
1035 /* X509_NAME_oneline, if passed a NULL buf, allocate memomry */
1036 sname = X509_NAME_oneline( subject, NULL, 0 );
1037 iname = X509_NAME_oneline( issuer, NULL, 0 );
1038 if ( !ok ) certerr = (char *)X509_verify_cert_error_string( errnum );
1040 if ( sname ) __etoa( sname );
1041 if ( iname ) __etoa( iname );
1043 certerr = LDAP_STRDUP( certerr );
1047 Debug( LDAP_DEBUG_TRACE,
1048 "TLS certificate verification: depth: %d, err: %d, subject: %s,",
1050 sname ? sname : "-unknown-" );
1051 Debug( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-", 0, 0 );
1053 Debug( LDAP_DEBUG_ANY,
1054 "TLS certificate verification: Error, %s\n",
1058 CRYPTO_free ( sname );
1060 CRYPTO_free ( iname );
1062 if ( certerr ) LDAP_FREE( certerr );
1068 tlso_verify_ok( int ok, X509_STORE_CTX *ctx )
1070 (void) tlso_verify_cb( ok, ctx );
1074 /* Inspired by ERR_print_errors in OpenSSL */
1076 tlso_report_error( void )
1083 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
1084 ERR_error_string_n( l, buf, sizeof( buf ) );
1087 file = LDAP_STRDUP( file );
1088 __etoa( (char *)file );
1092 Debug( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
1095 if ( file ) LDAP_FREE( (void *)file );
1101 tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
1104 /* FIXME: Pregenerate the key on startup */
1105 /* FIXME: Who frees the key? */
1106 #if OPENSSL_VERSION_NUMBER >= 0x00908000
1107 BIGNUM *bn = BN_new();
1110 if ( BN_set_word( bn, RSA_F4 )) {
1111 tmp_rsa = RSA_new();
1112 if ( tmp_rsa && !RSA_generate_key_ex( tmp_rsa, key_length, bn, NULL )) {
1113 RSA_free( tmp_rsa );
1120 tmp_rsa = RSA_generate_key( key_length, RSA_F4, NULL, NULL );
1124 Debug( LDAP_DEBUG_ANY,
1125 "TLS: Failed to generate temporary %d-bit %s RSA key\n",
1126 key_length, is_export ? "export" : "domestic", 0 );
1132 tlso_seed_PRNG( const char *randfile )
1134 #ifndef URANDOM_DEVICE
1135 /* no /dev/urandom (or equiv) */
1137 char buffer[MAXPATHLEN];
1139 if (randfile == NULL) {
1140 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
1141 * If $HOME is not set or buffer too small to hold the pathname,
1142 * an error occurs. - From RAND_file_name() man page.
1143 * The fact is that when $HOME is NULL, .rnd is used.
1145 randfile = RAND_file_name( buffer, sizeof( buffer ) );
1147 } else if (RAND_egd(randfile) > 0) {
1152 if (randfile == NULL) {
1153 Debug( LDAP_DEBUG_ANY,
1154 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n",
1159 total = RAND_load_file(randfile, -1);
1161 if (RAND_status() == 0) {
1162 Debug( LDAP_DEBUG_ANY,
1163 "TLS: PRNG not been seeded with enough data\n",
1168 /* assume if there was enough bits to seed that it's okay
1169 * to write derived bits to the file
1171 RAND_write_file(randfile);
1185 /* From the OpenSSL 0.9.7 distro */
1186 static const char tlso_dhpem512[] =
1187 "-----BEGIN DH PARAMETERS-----\n\
1188 MEYCQQDaWDwW2YUiidDkr3VvTMqS3UvlM7gE+w/tlO+cikQD7VdGUNNpmdsp13Yn\n\
1189 a6LT1BLiGPTdHghM9tgAPnxHdOgzAgEC\n\
1190 -----END DH PARAMETERS-----\n";
1192 static const char tlso_dhpem1024[] =
1193 "-----BEGIN DH PARAMETERS-----\n\
1194 MIGHAoGBAJf2QmHKtQXdKCjhPx1ottPb0PMTBH9A6FbaWMsTuKG/K3g6TG1Z1fkq\n\
1195 /Gz/PWk/eLI9TzFgqVAuPvr3q14a1aZeVUMTgo2oO5/y2UHe6VaJ+trqCTat3xlx\n\
1196 /mNbIK9HA2RgPC3gWfVLZQrY+gz3ASHHR5nXWHEyvpuZm7m3h+irAgEC\n\
1197 -----END DH PARAMETERS-----\n";
1199 static const char tlso_dhpem2048[] =
1200 "-----BEGIN DH PARAMETERS-----\n\
1201 MIIBCAKCAQEA7ZKJNYJFVcs7+6J2WmkEYb8h86tT0s0h2v94GRFS8Q7B4lW9aG9o\n\
1202 AFO5Imov5Jo0H2XMWTKKvbHbSe3fpxJmw/0hBHAY8H/W91hRGXKCeyKpNBgdL8sh\n\
1203 z22SrkO2qCnHJ6PLAMXy5fsKpFmFor2tRfCzrfnggTXu2YOzzK7q62bmqVdmufEo\n\
1204 pT8igNcLpvZxk5uBDvhakObMym9mX3rAEBoe8PwttggMYiiw7NuJKO4MqD1llGkW\n\
1205 aVM8U2ATsCun1IKHrRxynkE1/MJ86VHeYYX8GZt2YA8z+GuzylIOKcMH6JAWzMwA\n\
1206 Gbatw6QwizOhr9iMjZ0B26TE3X8LvW84wwIBAg==\n\
1207 -----END DH PARAMETERS-----\n";
1209 static const char tlso_dhpem4096[] =
1210 "-----BEGIN DH PARAMETERS-----\n\
1211 MIICCAKCAgEA/urRnb6vkPYc/KEGXWnbCIOaKitq7ySIq9dTH7s+Ri59zs77zty7\n\
1212 vfVlSe6VFTBWgYjD2XKUFmtqq6CqXMhVX5ElUDoYDpAyTH85xqNFLzFC7nKrff/H\n\
1213 TFKNttp22cZE9V0IPpzedPfnQkE7aUdmF9JnDyv21Z/818O93u1B4r0szdnmEvEF\n\
1214 bKuIxEHX+bp0ZR7RqE1AeifXGJX3d6tsd2PMAObxwwsv55RGkn50vHO4QxtTARr1\n\
1215 rRUV5j3B3oPMgC7Offxx+98Xn45B1/G0Prp11anDsR1PGwtaCYipqsvMwQUSJtyE\n\
1216 EOQWk+yFkeMe4vWv367eEi0Sd/wnC+TSXBE3pYvpYerJ8n1MceI5GQTdarJ77OW9\n\
1217 bGTHmxRsLSCM1jpLdPja5jjb4siAa6EHc4qN9c/iFKS3PQPJEnX7pXKBRs5f7AF3\n\
1218 W3RIGt+G9IVNZfXaS7Z/iCpgzgvKCs0VeqN38QsJGtC1aIkwOeyjPNy2G6jJ4yqH\n\
1219 ovXYt/0mc00vCWeSNS1wren0pR2EiLxX0ypjjgsU1mk/Z3b/+zVf7fZSIB+nDLjb\n\
1220 NPtUlJCVGnAeBK1J1nG3TQicqowOXoM6ISkdaXj5GPJdXHab2+S7cqhKGv5qC7rR\n\
1221 jT6sx7RUr0CNTxzLI7muV2/a4tGmj0PSdXQdsZ7tw7gbXlaWT1+MM2MCAQI=\n\
1222 -----END DH PARAMETERS-----\n";
1224 static const struct dhinfo tlso_dhpem[] = {
1225 { 512, tlso_dhpem512, sizeof(tlso_dhpem512) },
1226 { 1024, tlso_dhpem1024, sizeof(tlso_dhpem1024) },
1227 { 2048, tlso_dhpem2048, sizeof(tlso_dhpem2048) },
1228 { 4096, tlso_dhpem4096, sizeof(tlso_dhpem4096) },
1233 tlso_tmp_dh_cb( SSL *ssl, int is_export, int key_length )
1235 struct dhplist *p = NULL;
1240 /* Do we have params of this length already? */
1241 LDAP_MUTEX_LOCK( &tlso_dh_mutex );
1242 for ( p = tlso_dhparams; p; p=p->next ) {
1243 if ( p->keylength == key_length ) {
1244 LDAP_MUTEX_UNLOCK( &tlso_dh_mutex );
1249 /* No - check for hardcoded params */
1251 for (i=0; tlso_dhpem[i].keylength; i++) {
1252 if ( tlso_dhpem[i].keylength == key_length ) {
1253 b = BIO_new_mem_buf( (char *)tlso_dhpem[i].pem, tlso_dhpem[i].size );
1259 dh = PEM_read_bio_DHparams( b, NULL, NULL, NULL );
1263 /* Generating on the fly is expensive/slow... */
1265 dh = DH_generate_parameters( key_length, DH_GENERATOR_2, NULL, NULL );
1268 p = LDAP_MALLOC( sizeof(struct dhplist) );
1270 p->keylength = key_length;
1272 p->next = tlso_dhparams;
1277 LDAP_MUTEX_UNLOCK( &tlso_dh_mutex );
1281 tls_impl ldap_int_tls_impl = {
1293 tlso_session_connect,
1294 tlso_session_accept,
1295 tlso_session_upflags,
1296 tlso_session_errmsg,
1298 tlso_session_peer_dn,
1299 tlso_session_chkhost,
1300 tlso_session_strength,
1301 tlso_session_unique,
1305 #ifdef LDAP_R_COMPILE
1314 #endif /* HAVE_OPENSSL */