1 /* $NetBSD: tls_o.c,v 1.9 2021/08/14 16:14:56 christos Exp $ */
2
3 /* tls_o.c - Handle tls/ssl using OpenSSL */
4 /* $OpenLDAP$ */
5 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
6 *
7 * Copyright 2008-2021 The OpenLDAP Foundation.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted only as authorized by the OpenLDAP
12 * Public License.
13 *
14 * A copy of this license is available in the file LICENSE in the
15 * top-level directory of the distribution or, alternatively, at
16 * <http://www.OpenLDAP.org/license.html>.
17 */
18 /* ACKNOWLEDGEMENTS: Rewritten by Howard Chu
19 */
20
21 #include <sys/cdefs.h>
22 __RCSID("$NetBSD: tls_o.c,v 1.9 2021/08/14 16:14:56 christos Exp $");
23
24 #include "portable.h"
25
26 #ifdef HAVE_OPENSSL
27
28 #include "ldap_config.h"
29
30 #include <stdio.h>
31
32 #include <ac/stdlib.h>
33 #include <ac/errno.h>
34 #include <ac/socket.h>
35 #include <ac/string.h>
36 #include <ac/ctype.h>
37 #include <ac/time.h>
38 #include <ac/unistd.h>
39 #include <ac/param.h>
40 #include <ac/dirent.h>
41
42 #include "ldap-int.h"
43 #include "ldap-tls.h"
44
45 #ifdef HAVE_OPENSSL_SSL_H
46 #include <openssl/ssl.h>
47 #include <openssl/x509v3.h>
48 #include <openssl/err.h>
49 #include <openssl/rand.h>
50 #include <openssl/safestack.h>
51 #include <openssl/bn.h>
52 #include <openssl/rsa.h>
53 #include <openssl/dh.h>
54 #endif
55
56 #if OPENSSL_VERSION_NUMBER >= 0x10100000
57 #define ASN1_STRING_data(x) ASN1_STRING_get0_data(x)
58 #endif
59
60 typedef SSL_CTX tlso_ctx;
61 typedef SSL tlso_session;
62
63 static BIO_METHOD * tlso_bio_method = NULL;
64 static BIO_METHOD * tlso_bio_setup( void );
65
66 static int tlso_opt_trace = 1;
67
68 static void tlso_report_error( void );
69
70 static void tlso_info_cb( const SSL *ssl, int where, int ret );
71 static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx );
72 static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx );
73 static int tlso_seed_PRNG( const char *randfile );
74 #if OPENSSL_VERSION_NUMBER < 0x10100000
75 /*
76 * OpenSSL 1.1 API and later has new locking code
77 */
78 static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
79
80 #ifdef LDAP_R_COMPILE
81 /*
82 * provide mutexes for the OpenSSL library.
83 */
84 static ldap_pvt_thread_mutex_t tlso_mutexes[CRYPTO_NUM_LOCKS];
85
tlso_locking_cb(int mode,int type,const char * file,int line)86 static void tlso_locking_cb( int mode, int type, const char *file, int line )
87 {
88 if ( mode & CRYPTO_LOCK ) {
89 ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] );
90 } else {
91 ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] );
92 }
93 }
94
95 #if OPENSSL_VERSION_NUMBER >= 0x0909000
tlso_thread_self(CRYPTO_THREADID * id)96 static void tlso_thread_self( CRYPTO_THREADID *id )
97 {
98 CRYPTO_THREADID_set_pointer( id, (void *)ldap_pvt_thread_self() );
99 }
100 #define CRYPTO_set_id_callback(foo) CRYPTO_THREADID_set_callback(foo)
101 #else
tlso_thread_self(void)102 static unsigned long tlso_thread_self( void )
103 {
104 /* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t
105 * is an integral type that fits in an unsigned long
106 */
107
108 /* force an error if the ldap_pvt_thread_t type is too large */
109 enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) };
110 typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1];
111
112 return (unsigned long) ldap_pvt_thread_self();
113 }
114 #endif
115
tlso_thr_init(void)116 static void tlso_thr_init( void )
117 {
118 int i;
119
120 for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
121 ldap_pvt_thread_mutex_init( &tlso_mutexes[i] );
122 }
123 CRYPTO_set_locking_callback( tlso_locking_cb );
124 CRYPTO_set_id_callback( tlso_thread_self );
125 }
126 #endif /* LDAP_R_COMPILE */
127 #else
128 #ifdef LDAP_R_COMPILE
tlso_thr_init(void)129 static void tlso_thr_init( void ) {}
130 #endif
131 #endif /* OpenSSL 1.1 */
132
133 #if OPENSSL_VERSION_NUMBER < 0x10100000
134 /*
135 * OpenSSL 1.1 API and later makes the BIO method concrete types internal.
136 */
137
138 static BIO_METHOD *
BIO_meth_new(int type,const char * name)139 BIO_meth_new( int type, const char *name )
140 {
141 BIO_METHOD *method = LDAP_MALLOC( sizeof(BIO_METHOD) );
142 memset( method, 0, sizeof(BIO_METHOD) );
143
144 method->type = type;
145 method->name = name;
146
147 return method;
148 }
149
150 static void
BIO_meth_free(BIO_METHOD * meth)151 BIO_meth_free( BIO_METHOD *meth )
152 {
153 if ( meth == NULL ) {
154 return;
155 }
156
157 LDAP_FREE( meth );
158 }
159
160 #define BIO_meth_set_write(m, f) (m)->bwrite = (f)
161 #define BIO_meth_set_read(m, f) (m)->bread = (f)
162 #define BIO_meth_set_puts(m, f) (m)->bputs = (f)
163 #define BIO_meth_set_gets(m, f) (m)->bgets = (f)
164 #define BIO_meth_set_ctrl(m, f) (m)->ctrl = (f)
165 #define BIO_meth_set_create(m, f) (m)->create = (f)
166 #define BIO_meth_set_destroy(m, f) (m)->destroy = (f)
167
168 #endif /* OpenSSL 1.1 */
169
STACK_OF(X509_NAME)170 static STACK_OF(X509_NAME) *
171 tlso_ca_list( char * bundle, char * dir, X509 *cert )
172 {
173 STACK_OF(X509_NAME) *ca_list = NULL;
174
175 if ( bundle ) {
176 ca_list = SSL_load_client_CA_file( bundle );
177 }
178 #if defined(HAVE_DIRENT_H) || defined(dirent)
179 if ( dir ) {
180 int freeit = 0;
181
182 if ( !ca_list ) {
183 ca_list = sk_X509_NAME_new_null();
184 freeit = 1;
185 }
186 if ( !SSL_add_dir_cert_subjects_to_stack( ca_list, dir ) &&
187 freeit ) {
188 sk_X509_NAME_free( ca_list );
189 ca_list = NULL;
190 }
191 }
192 #endif
193 if ( cert ) {
194 X509_NAME *xn = X509_get_subject_name( cert );
195 xn = X509_NAME_dup( xn );
196 if ( !ca_list )
197 ca_list = sk_X509_NAME_new_null();
198 if ( xn && ca_list )
199 sk_X509_NAME_push( ca_list, xn );
200 }
201 return ca_list;
202 }
203
204 /*
205 * Initialize TLS subsystem. Should be called only once.
206 */
207 static int
tlso_init(void)208 tlso_init( void )
209 {
210 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
211 #ifdef HAVE_EBCDIC
212 {
213 char *file = LDAP_STRDUP( lo->ldo_tls_randfile );
214 if ( file ) __atoe( file );
215 (void) tlso_seed_PRNG( file );
216 LDAP_FREE( file );
217 }
218 #else
219 (void) tlso_seed_PRNG( lo->ldo_tls_randfile );
220 #endif
221
222 #if OPENSSL_VERSION_NUMBER < 0x10100000
223 SSL_load_error_strings();
224 SSL_library_init();
225 OpenSSL_add_all_digests();
226 #else
227 OPENSSL_init_ssl(0, NULL);
228 #endif
229
230 /* FIXME: mod_ssl does this */
231 X509V3_add_standard_extensions();
232
233 tlso_bio_method = tlso_bio_setup();
234
235 return 0;
236 }
237
238 /*
239 * Tear down the TLS subsystem. Should only be called once.
240 */
241 static void
tlso_destroy(void)242 tlso_destroy( void )
243 {
244 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
245
246 BIO_meth_free( tlso_bio_method );
247
248 #if OPENSSL_VERSION_NUMBER < 0x10100000
249 EVP_cleanup();
250 ERR_remove_thread_state(NULL);
251 ERR_free_strings();
252 #endif
253
254 if ( lo->ldo_tls_randfile ) {
255 LDAP_FREE( lo->ldo_tls_randfile );
256 lo->ldo_tls_randfile = NULL;
257 }
258 }
259
260 static tls_ctx *
tlso_ctx_new(struct ldapoptions * lo)261 tlso_ctx_new( struct ldapoptions *lo )
262 {
263 return (tls_ctx *) SSL_CTX_new( SSLv23_method() );
264 }
265
266 static void
tlso_ctx_ref(tls_ctx * ctx)267 tlso_ctx_ref( tls_ctx *ctx )
268 {
269 tlso_ctx *c = (tlso_ctx *)ctx;
270 #if OPENSSL_VERSION_NUMBER < 0x10100000
271 #define SSL_CTX_up_ref(ctx) CRYPTO_add( &(ctx->references), 1, CRYPTO_LOCK_SSL_CTX )
272 #endif
273 SSL_CTX_up_ref( c );
274 }
275
276 static void
tlso_ctx_free(tls_ctx * ctx)277 tlso_ctx_free ( tls_ctx *ctx )
278 {
279 tlso_ctx *c = (tlso_ctx *)ctx;
280 SSL_CTX_free( c );
281 }
282
283 #if OPENSSL_VERSION_NUMBER >= 0x10101000
284 static char *
tlso_stecpy(char * dst,const char * src,const char * end)285 tlso_stecpy( char *dst, const char *src, const char *end )
286 {
287 while ( dst < end && *src )
288 *dst++ = *src++;
289 if ( dst < end )
290 *dst = '\0';
291 return dst;
292 }
293
294 /* OpenSSL 1.1.1 uses a separate API for TLS1.3 ciphersuites.
295 * Try to find any TLS1.3 ciphers in the given list of suites.
296 */
297 static void
tlso_ctx_cipher13(tlso_ctx * ctx,char * suites)298 tlso_ctx_cipher13( tlso_ctx *ctx, char *suites )
299 {
300 char tls13_suites[1024], *ts = tls13_suites, *te = tls13_suites + sizeof(tls13_suites);
301 char *ptr, *colon, *nptr;
302 char sname[128];
303 STACK_OF(SSL_CIPHER) *cs;
304 SSL *s = SSL_new( ctx );
305 int ret;
306
307 if ( !s )
308 return;
309
310 *ts = '\0';
311
312 /* check individual suites in a separate SSL handle before
313 * mucking with the provided ctx. Init it to a known
314 * mostly-empty state.
315 */
316 SSL_set_ciphersuites( s, "" );
317 SSL_set_cipher_list( s, SSL3_TXT_RSA_NULL_SHA );
318
319 for ( ptr = suites;; ) {
320 colon = strchr( ptr, ':' );
321 if ( colon ) {
322 int len = colon - ptr;
323 if ( len > 63 ) len = 63;
324 strncpy( sname, ptr, len );
325 sname[len] = '\0';
326 nptr = sname;
327 } else {
328 nptr = ptr;
329 }
330 if ( SSL_set_ciphersuites( s, nptr )) {
331 cs = SSL_get_ciphers( s );
332 if ( cs ) {
333 const char *ver = SSL_CIPHER_get_version( sk_SSL_CIPHER_value( cs, 0 ));
334 if ( !strncmp( ver, "TLSv", 4 ) && strncmp( ver+4, "1.3", 3 ) >= 0 ) {
335 if ( tls13_suites[0] )
336 ts = tlso_stecpy( ts, ":", te );
337 ts = tlso_stecpy( ts, sname, te );
338 }
339 }
340 }
341 if ( !colon || ts >= te )
342 break;
343 ptr = colon+1;
344 }
345 SSL_free( s );
346
347 /* If no TLS1.3 ciphersuites were specified, leave current settings untouched. */
348 if ( tls13_suites[0] )
349 SSL_CTX_set_ciphersuites( ctx, tls13_suites );
350 }
351 #endif /* OpenSSL 1.1.1 */
352
353 /*
354 * initialize a new TLS context
355 */
356 static int
tlso_ctx_init(struct ldapoptions * lo,struct ldaptls * lt,int is_server)357 tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server )
358 {
359 tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx;
360 int i;
361
362 if ( is_server ) {
363 SSL_CTX_set_session_id_context( ctx,
364 (const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
365 }
366
367 if ( lo->ldo_tls_protocol_min ) {
368 int opt = 0;
369 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 ) {
370 opt |= SSL_OP_NO_SSLv2;
371 SSL_CTX_clear_options( ctx, SSL_OP_NO_SSLv3 );
372 }
373 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
374 opt |= SSL_OP_NO_SSLv3;
375 #ifdef SSL_OP_NO_TLSv1
376 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
377 opt |= SSL_OP_NO_TLSv1;
378 #endif
379 #ifdef SSL_OP_NO_TLSv1_1
380 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
381 opt |= SSL_OP_NO_TLSv1_1;
382 #endif
383 #ifdef SSL_OP_NO_TLSv1_2
384 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
385 opt |= SSL_OP_NO_TLSv1_2;
386 #endif
387 #ifdef SSL_OP_NO_TLSv1_3
388 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
389 opt |= SSL_OP_NO_TLSv1_3;
390 #endif
391 if ( opt )
392 SSL_CTX_set_options( ctx, opt );
393 }
394 if ( lo->ldo_tls_protocol_max ) {
395 int opt = 0;
396 #ifdef SSL_OP_NO_TLSv1_3
397 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
398 opt |= SSL_OP_NO_TLSv1_3;
399 #endif
400 #ifdef SSL_OP_NO_TLSv1_2
401 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
402 opt |= SSL_OP_NO_TLSv1_2;
403 #endif
404 #ifdef SSL_OP_NO_TLSv1_1
405 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
406 opt |= SSL_OP_NO_TLSv1_1;
407 #endif
408 #ifdef SSL_OP_NO_TLSv1
409 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
410 opt |= SSL_OP_NO_TLSv1;
411 #endif
412 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
413 opt |= SSL_OP_NO_SSLv3;
414 if ( opt )
415 SSL_CTX_set_options( ctx, opt );
416 }
417
418 if ( lo->ldo_tls_ciphersuite ) {
419 #if OPENSSL_VERSION_NUMBER >= 0x10101000
420 tlso_ctx_cipher13( ctx, lt->lt_ciphersuite );
421 #endif
422 if ( !SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) )
423 {
424 Debug1( LDAP_DEBUG_ANY,
425 "TLS: could not set cipher list %s.\n",
426 lo->ldo_tls_ciphersuite );
427 tlso_report_error();
428 return -1;
429 }
430 }
431
432 if ( lo->ldo_tls_cacertfile == NULL && lo->ldo_tls_cacertdir == NULL &&
433 lo->ldo_tls_cacert.bv_val == NULL ) {
434 if ( !SSL_CTX_set_default_verify_paths( ctx ) ) {
435 Debug0( LDAP_DEBUG_ANY, "TLS: "
436 "could not use default certificate paths" );
437 tlso_report_error();
438 return -1;
439 }
440 } else {
441 X509 *cert = NULL;
442 if ( lo->ldo_tls_cacert.bv_val ) {
443 const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cacert.bv_val);
444 cert = d2i_X509( NULL, &pp, lo->ldo_tls_cacert.bv_len );
445 X509_STORE *store = SSL_CTX_get_cert_store( ctx );
446 if ( !X509_STORE_add_cert( store, cert )) {
447 Debug0( LDAP_DEBUG_ANY, "TLS: "
448 "could not use CA certificate" );
449 tlso_report_error();
450 return -1;
451 }
452 }
453 if (( lt->lt_cacertfile || lt->lt_cacertdir ) && !SSL_CTX_load_verify_locations( ctx,
454 lt->lt_cacertfile, lt->lt_cacertdir ) )
455 {
456 Debug2( LDAP_DEBUG_ANY, "TLS: "
457 "could not load verify locations (file:`%s',dir:`%s').\n",
458 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
459 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "" );
460 tlso_report_error();
461 return -1;
462 }
463
464 if ( is_server ) {
465 STACK_OF(X509_NAME) *calist;
466 /* List of CA names to send to a client */
467 calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir, cert );
468 if ( !calist ) {
469 Debug2( LDAP_DEBUG_ANY, "TLS: "
470 "could not load client CA list (file:`%s',dir:`%s').\n",
471 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
472 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "" );
473 tlso_report_error();
474 return -1;
475 }
476
477 SSL_CTX_set_client_CA_list( ctx, calist );
478 }
479 if ( cert )
480 X509_free( cert );
481 }
482
483 if ( lo->ldo_tls_cert.bv_val )
484 {
485 const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cert.bv_val);
486 X509 *cert = d2i_X509( NULL, &pp, lo->ldo_tls_cert.bv_len );
487 if ( !SSL_CTX_use_certificate( ctx, cert )) {
488 Debug0( LDAP_DEBUG_ANY,
489 "TLS: could not use certificate.\n" );
490 tlso_report_error();
491 return -1;
492 }
493 X509_free( cert );
494 } else
495 if ( lo->ldo_tls_certfile &&
496 !SSL_CTX_use_certificate_chain_file( ctx, lt->lt_certfile) )
497 {
498 Debug1( LDAP_DEBUG_ANY,
499 "TLS: could not use certificate file `%s'.\n",
500 lo->ldo_tls_certfile );
501 tlso_report_error();
502 return -1;
503 }
504
505 /* Key validity is checked automatically if cert has already been set */
506 if ( lo->ldo_tls_key.bv_val )
507 {
508 const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_key.bv_val);
509 EVP_PKEY *pkey = d2i_AutoPrivateKey( NULL, &pp, lo->ldo_tls_key.bv_len );
510 if ( !SSL_CTX_use_PrivateKey( ctx, pkey ))
511 {
512 Debug0( LDAP_DEBUG_ANY,
513 "TLS: could not use private key.\n" );
514 tlso_report_error();
515 return -1;
516 }
517 EVP_PKEY_free( pkey );
518 } else
519 if ( lo->ldo_tls_keyfile &&
520 !SSL_CTX_use_PrivateKey_file( ctx,
521 lt->lt_keyfile, SSL_FILETYPE_PEM ) )
522 {
523 Debug1( LDAP_DEBUG_ANY,
524 "TLS: could not use key file `%s'.\n",
525 lo->ldo_tls_keyfile );
526 tlso_report_error();
527 return -1;
528 }
529
530 if ( is_server && lo->ldo_tls_dhfile ) {
531 DH *dh;
532 BIO *bio;
533
534 if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
535 Debug1( LDAP_DEBUG_ANY,
536 "TLS: could not use DH parameters file `%s'.\n",
537 lo->ldo_tls_dhfile );
538 tlso_report_error();
539 return -1;
540 }
541 if (!( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
542 Debug1( LDAP_DEBUG_ANY,
543 "TLS: could not read DH parameters file `%s'.\n",
544 lo->ldo_tls_dhfile );
545 tlso_report_error();
546 BIO_free( bio );
547 return -1;
548 }
549 BIO_free( bio );
550 SSL_CTX_set_tmp_dh( ctx, dh );
551 SSL_CTX_set_options( ctx, SSL_OP_SINGLE_DH_USE );
552 DH_free( dh );
553 }
554
555 if ( lo->ldo_tls_ecname ) {
556 #ifdef OPENSSL_NO_EC
557 Debug0( LDAP_DEBUG_ANY,
558 "TLS: Elliptic Curves not supported.\n" );
559 return -1;
560 #else
561 if ( !SSL_CTX_set1_curves_list( ctx, lt->lt_ecname )) {
562 Debug1( LDAP_DEBUG_ANY,
563 "TLS: could not set EC name `%s'.\n",
564 lo->ldo_tls_ecname );
565 tlso_report_error();
566 return -1;
567 }
568 /*
569 * This is a NOP in OpenSSL 1.1.0 and later, where curves are always
570 * auto-negotiated.
571 */
572 #if OPENSSL_VERSION_NUMBER < 0x10100000UL
573 if ( SSL_CTX_set_ecdh_auto( ctx, 1 ) <= 0 ) {
574 Debug0( LDAP_DEBUG_ANY,
575 "TLS: could not enable automatic EC negotiation.\n" );
576 }
577 #endif
578 #endif /* OPENSSL_NO_EC */
579 }
580
581 if ( tlso_opt_trace ) {
582 SSL_CTX_set_info_callback( ctx, tlso_info_cb );
583 }
584
585 i = SSL_VERIFY_NONE;
586 if ( lo->ldo_tls_require_cert ) {
587 i = SSL_VERIFY_PEER;
588 if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
589 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) {
590 i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
591 }
592 }
593
594 SSL_CTX_set_verify( ctx, i,
595 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
596 tlso_verify_ok : tlso_verify_cb );
597 #if OPENSSL_VERSION_NUMBER < 0x10100000
598 SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
599 #endif
600 if ( lo->ldo_tls_crlcheck ) {
601 X509_STORE *x509_s = SSL_CTX_get_cert_store( ctx );
602 if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) {
603 X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK );
604 } else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) {
605 X509_STORE_set_flags( x509_s,
606 X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL );
607 }
608 }
609 /* Explicitly honor the server side cipher suite preference */
610 SSL_CTX_set_options( ctx, SSL_OP_CIPHER_SERVER_PREFERENCE );
611 return 0;
612 }
613
614 static tls_session *
tlso_session_new(tls_ctx * ctx,int is_server)615 tlso_session_new( tls_ctx *ctx, int is_server )
616 {
617 tlso_ctx *c = (tlso_ctx *)ctx;
618 return (tls_session *)SSL_new( c );
619 }
620
621 static int
tlso_session_connect(LDAP * ld,tls_session * sess,const char * name_in)622 tlso_session_connect( LDAP *ld, tls_session *sess, const char *name_in )
623 {
624 tlso_session *s = (tlso_session *)sess;
625 int rc;
626
627 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
628 if ( name_in ) {
629 rc = SSL_set_tlsext_host_name( s, name_in );
630 if ( !rc ) /* can fail to strdup the name */
631 return -1;
632 }
633 #endif
634 /* Caller expects 0 = success, OpenSSL returns 1 = success */
635 rc = SSL_connect( s ) - 1;
636 return rc;
637 }
638
639 static int
tlso_session_accept(tls_session * sess)640 tlso_session_accept( tls_session *sess )
641 {
642 tlso_session *s = (tlso_session *)sess;
643
644 /* Caller expects 0 = success, OpenSSL returns 1 = success */
645 return SSL_accept( s ) - 1;
646 }
647
648 static int
tlso_session_upflags(Sockbuf * sb,tls_session * sess,int rc)649 tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc )
650 {
651 tlso_session *s = (tlso_session *)sess;
652
653 /* 1 was subtracted above, offset it back now */
654 rc = SSL_get_error(s, rc+1);
655 if (rc == SSL_ERROR_WANT_READ) {
656 sb->sb_trans_needs_read = 1;
657 return 1;
658
659 } else if (rc == SSL_ERROR_WANT_WRITE) {
660 sb->sb_trans_needs_write = 1;
661 return 1;
662
663 } else if (rc == SSL_ERROR_WANT_CONNECT) {
664 return 1;
665 }
666 return 0;
667 }
668
669 static char *
tlso_session_errmsg(tls_session * sess,int rc,char * buf,size_t len)670 tlso_session_errmsg( tls_session *sess, int rc, char *buf, size_t len )
671 {
672 char err[256] = "";
673 const char *certerr=NULL;
674 tlso_session *s = (tlso_session *)sess;
675
676 rc = ERR_peek_error();
677 if ( rc ) {
678 ERR_error_string_n( rc, err, sizeof(err) );
679 if ( ( ERR_GET_LIB(rc) == ERR_LIB_SSL ) &&
680 ( ERR_GET_REASON(rc) == SSL_R_CERTIFICATE_VERIFY_FAILED ) ) {
681 int certrc = SSL_get_verify_result(s);
682 certerr = (char *)X509_verify_cert_error_string(certrc);
683 }
684 snprintf(buf, len, "%s%s%s%s", err, certerr ? " (" :"",
685 certerr ? certerr : "", certerr ? ")" : "" );
686 return buf;
687 }
688 return NULL;
689 }
690
691 static int
tlso_session_my_dn(tls_session * sess,struct berval * der_dn)692 tlso_session_my_dn( tls_session *sess, struct berval *der_dn )
693 {
694 tlso_session *s = (tlso_session *)sess;
695 X509 *x;
696 X509_NAME *xn;
697
698 x = SSL_get_certificate( s );
699
700 if (!x) return LDAP_INVALID_CREDENTIALS;
701
702 xn = X509_get_subject_name(x);
703 #if OPENSSL_VERSION_NUMBER < 0x10100000
704 der_dn->bv_len = i2d_X509_NAME( xn, NULL );
705 der_dn->bv_val = xn->bytes->data;
706 #else
707 {
708 size_t len = 0;
709 der_dn->bv_val = NULL;
710 X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
711 der_dn->bv_len = len;
712 }
713 #endif
714 /* Don't X509_free, the session is still using it */
715 return 0;
716 }
717
718 static X509 *
tlso_get_cert(SSL * s)719 tlso_get_cert( SSL *s )
720 {
721 /* If peer cert was bad, treat as if no cert was given */
722 if (SSL_get_verify_result(s)) {
723 return NULL;
724 }
725 return SSL_get_peer_certificate(s);
726 }
727
728 static int
tlso_session_peer_dn(tls_session * sess,struct berval * der_dn)729 tlso_session_peer_dn( tls_session *sess, struct berval *der_dn )
730 {
731 tlso_session *s = (tlso_session *)sess;
732 X509 *x = tlso_get_cert( s );
733 X509_NAME *xn;
734
735 if ( !x )
736 return LDAP_INVALID_CREDENTIALS;
737
738 xn = X509_get_subject_name(x);
739 #if OPENSSL_VERSION_NUMBER < 0x10100000
740 der_dn->bv_len = i2d_X509_NAME( xn, NULL );
741 der_dn->bv_val = xn->bytes->data;
742 #else
743 {
744 size_t len = 0;
745 der_dn->bv_val = NULL;
746 X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
747 der_dn->bv_len = len;
748 }
749 #endif
750 X509_free(x);
751 return 0;
752 }
753
754 /* what kind of hostname were we given? */
755 #define IS_DNS 0
756 #define IS_IP4 1
757 #define IS_IP6 2
758
759 static int
tlso_session_chkhost(LDAP * ld,tls_session * sess,const char * name_in)760 tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in )
761 {
762 tlso_session *s = (tlso_session *)sess;
763 int i, ret = LDAP_LOCAL_ERROR;
764 int chkSAN = ld->ld_options.ldo_tls_require_san, gotSAN = 0;
765 X509 *x;
766 const char *name;
767 char *ptr;
768 int ntype = IS_DNS, nlen;
769 #ifdef LDAP_PF_INET6
770 struct in6_addr addr;
771 #else
772 struct in_addr addr;
773 #endif
774
775 if( ldap_int_hostname &&
776 ( !name_in || !strcasecmp( name_in, "localhost" ) ) )
777 {
778 name = ldap_int_hostname;
779 } else {
780 name = name_in;
781 }
782 nlen = strlen(name);
783
784 x = tlso_get_cert(s);
785 if (!x) {
786 Debug0( LDAP_DEBUG_ANY,
787 "TLS: unable to get peer certificate.\n" );
788 /* If this was a fatal condition, things would have
789 * aborted long before now.
790 */
791 return LDAP_SUCCESS;
792 }
793
794 #ifdef LDAP_PF_INET6
795 if (inet_pton(AF_INET6, name, &addr)) {
796 ntype = IS_IP6;
797 } else
798 #endif
799 if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
800 if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
801 }
802
803 if (chkSAN) {
804 i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
805 if (i >= 0) {
806 X509_EXTENSION *ex;
807 STACK_OF(GENERAL_NAME) *alt;
808
809 ex = X509_get_ext(x, i);
810 alt = X509V3_EXT_d2i(ex);
811 if (alt) {
812 int n, len2 = 0;
813 char *domain = NULL;
814 GENERAL_NAME *gn;
815
816 gotSAN = 1;
817 if (ntype == IS_DNS) {
818 domain = strchr(name, '.');
819 if (domain) {
820 len2 = nlen - (domain-name);
821 }
822 }
823 n = sk_GENERAL_NAME_num(alt);
824 for (i=0; i<n; i++) {
825 char *sn;
826 int sl;
827 gn = sk_GENERAL_NAME_value(alt, i);
828 if (gn->type == GEN_DNS) {
829 if (ntype != IS_DNS) continue;
830
831 sn = (char *) ASN1_STRING_data(gn->d.ia5);
832 sl = ASN1_STRING_length(gn->d.ia5);
833
834 /* ignore empty */
835 if (sl == 0) continue;
836
837 /* Is this an exact match? */
838 if ((nlen == sl) && !strncasecmp(name, sn, nlen)) {
839 break;
840 }
841
842 /* Is this a wildcard match? */
843 if (domain && (sn[0] == '*') && (sn[1] == '.') &&
844 (len2 == sl-1) && !strncasecmp(domain, &sn[1], len2))
845 {
846 break;
847 }
848
849 } else if (gn->type == GEN_IPADD) {
850 if (ntype == IS_DNS) continue;
851
852 sn = (char *) ASN1_STRING_data(gn->d.ia5);
853 sl = ASN1_STRING_length(gn->d.ia5);
854
855 #ifdef LDAP_PF_INET6
856 if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) {
857 continue;
858 } else
859 #endif
860 if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) {
861 continue;
862 }
863 if (!memcmp(sn, &addr, sl)) {
864 break;
865 }
866 }
867 }
868
869 GENERAL_NAMES_free(alt);
870 if (i < n) { /* Found a match */
871 ret = LDAP_SUCCESS;
872 }
873 }
874 }
875 }
876 if (ret != LDAP_SUCCESS && chkSAN) {
877 switch(chkSAN) {
878 case LDAP_OPT_X_TLS_DEMAND:
879 case LDAP_OPT_X_TLS_HARD:
880 if (!gotSAN) {
881 Debug0( LDAP_DEBUG_ANY,
882 "TLS: unable to get subjectAltName from peer certificate.\n" );
883 ret = LDAP_CONNECT_ERROR;
884 if ( ld->ld_error ) {
885 LDAP_FREE( ld->ld_error );
886 }
887 ld->ld_error = LDAP_STRDUP(
888 _("TLS: unable to get subjectAltName from peer certificate"));
889 goto done;
890 }
891 /* FALLTHRU */
892 case LDAP_OPT_X_TLS_TRY:
893 if (gotSAN) {
894 Debug1( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
895 "subjectAltName in certificate.\n",
896 name );
897 ret = LDAP_CONNECT_ERROR;
898 if ( ld->ld_error ) {
899 LDAP_FREE( ld->ld_error );
900 }
901 ld->ld_error = LDAP_STRDUP(
902 _("TLS: hostname does not match subjectAltName in peer certificate"));
903 goto done;
904 }
905 break;
906 case LDAP_OPT_X_TLS_ALLOW:
907 break;
908 }
909 }
910
911 if (ret != LDAP_SUCCESS) {
912 X509_NAME *xn;
913 X509_NAME_ENTRY *ne;
914 ASN1_OBJECT *obj;
915 ASN1_STRING *cn = NULL;
916 int navas;
917
918 /* find the last CN */
919 obj = OBJ_nid2obj( NID_commonName );
920 if ( !obj ) goto no_cn; /* should never happen */
921
922 xn = X509_get_subject_name(x);
923 navas = X509_NAME_entry_count( xn );
924 for ( i=navas-1; i>=0; i-- ) {
925 ne = X509_NAME_get_entry( xn, i );
926 if ( !OBJ_cmp( X509_NAME_ENTRY_get_object(ne), obj )) {
927 cn = X509_NAME_ENTRY_get_data( ne );
928 break;
929 }
930 }
931
932 if( !cn )
933 {
934 no_cn:
935 Debug0( LDAP_DEBUG_ANY,
936 "TLS: unable to get common name from peer certificate.\n" );
937 ret = LDAP_CONNECT_ERROR;
938 if ( ld->ld_error ) {
939 LDAP_FREE( ld->ld_error );
940 }
941 ld->ld_error = LDAP_STRDUP(
942 _("TLS: unable to get CN from peer certificate"));
943
944 } else if ( cn->length == nlen &&
945 strncasecmp( name, (char *) cn->data, nlen ) == 0 ) {
946 ret = LDAP_SUCCESS;
947
948 } else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) {
949 char *domain = strchr(name, '.');
950 if( domain ) {
951 int dlen;
952
953 dlen = nlen - (domain-name);
954
955 /* Is this a wildcard match? */
956 if ((dlen == cn->length-1) &&
957 !strncasecmp(domain, (char *) &cn->data[1], dlen)) {
958 ret = LDAP_SUCCESS;
959 }
960 }
961 }
962
963 if( ret == LDAP_LOCAL_ERROR ) {
964 Debug3( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
965 "common name in certificate (%.*s).\n",
966 name, cn->length, cn->data );
967 ret = LDAP_CONNECT_ERROR;
968 if ( ld->ld_error ) {
969 LDAP_FREE( ld->ld_error );
970 }
971 ld->ld_error = LDAP_STRDUP(
972 _("TLS: hostname does not match name in peer certificate"));
973 }
974 }
975 done:
976 X509_free(x);
977 return ret;
978 }
979
980 static int
tlso_session_strength(tls_session * sess)981 tlso_session_strength( tls_session *sess )
982 {
983 tlso_session *s = (tlso_session *)sess;
984
985 return SSL_CIPHER_get_bits(SSL_get_current_cipher(s), NULL);
986 }
987
988 static int
tlso_session_unique(tls_session * sess,struct berval * buf,int is_server)989 tlso_session_unique( tls_session *sess, struct berval *buf, int is_server)
990 {
991 tlso_session *s = (tlso_session *)sess;
992
993 /* Usually the client sends the finished msg. But if the
994 * session was resumed, the server sent the msg.
995 */
996 if (SSL_session_reused(s) ^ !is_server)
997 buf->bv_len = SSL_get_finished(s, buf->bv_val, buf->bv_len);
998 else
999 buf->bv_len = SSL_get_peer_finished(s, buf->bv_val, buf->bv_len);
1000 return buf->bv_len;
1001 }
1002
1003 static int
tlso_session_endpoint(tls_session * sess,struct berval * buf,int is_server)1004 tlso_session_endpoint( tls_session *sess, struct berval *buf, int is_server )
1005 {
1006 tlso_session *s = (tlso_session *)sess;
1007 const EVP_MD *md;
1008 unsigned int md_len;
1009 X509 *cert;
1010
1011 if ( buf->bv_len < EVP_MAX_MD_SIZE )
1012 return 0;
1013
1014 if ( is_server )
1015 cert = SSL_get_certificate( s );
1016 else
1017 cert = SSL_get_peer_certificate( s );
1018
1019 if ( cert == NULL )
1020 return 0;
1021
1022 #if OPENSSL_VERSION_NUMBER >= 0x10100000
1023 md = EVP_get_digestbynid( X509_get_signature_nid( cert ));
1024 #else
1025 md = EVP_get_digestbynid(OBJ_obj2nid( cert->sig_alg->algorithm ));
1026 #endif
1027
1028 /* See RFC 5929 */
1029 if ( md == NULL ||
1030 md == EVP_md_null() ||
1031 #ifndef OPENSSL_NO_MD2
1032 md == EVP_md2() ||
1033 #endif
1034 md == EVP_md4() ||
1035 md == EVP_md5() ||
1036 md == EVP_sha1() )
1037 md = EVP_sha256();
1038
1039 if ( !X509_digest( cert, md, (unsigned char *) (buf->bv_val), &md_len ))
1040 return 0;
1041
1042 buf->bv_len = md_len;
1043
1044 return md_len;
1045 }
1046
1047 static const char *
tlso_session_version(tls_session * sess)1048 tlso_session_version( tls_session *sess )
1049 {
1050 tlso_session *s = (tlso_session *)sess;
1051 return SSL_get_version(s);
1052 }
1053
1054 static const char *
tlso_session_cipher(tls_session * sess)1055 tlso_session_cipher( tls_session *sess )
1056 {
1057 tlso_session *s = (tlso_session *)sess;
1058 return SSL_CIPHER_get_name(SSL_get_current_cipher(s));
1059 }
1060
1061 static int
tlso_session_peercert(tls_session * sess,struct berval * der)1062 tlso_session_peercert( tls_session *sess, struct berval *der )
1063 {
1064 tlso_session *s = (tlso_session *)sess;
1065 unsigned char *ptr;
1066 X509 *x = SSL_get_peer_certificate(s);
1067 der->bv_len = i2d_X509(x, NULL);
1068 der->bv_val = LDAP_MALLOC(der->bv_len);
1069 if ( !der->bv_val )
1070 return -1;
1071 ptr = (unsigned char *) (der->bv_val);
1072 i2d_X509(x, &ptr);
1073 return 0;
1074 }
1075
1076 static int
tlso_session_pinning(LDAP * ld,tls_session * sess,char * hashalg,struct berval * hash)1077 tlso_session_pinning( LDAP *ld, tls_session *sess, char *hashalg, struct berval *hash )
1078 {
1079 tlso_session *s = (tlso_session *)sess;
1080 unsigned char *tmp, digest[EVP_MAX_MD_SIZE];
1081 struct berval key,
1082 keyhash = { sizeof(digest), (char *) digest };
1083 X509 *cert = SSL_get_peer_certificate(s);
1084 int len, rc = LDAP_SUCCESS;
1085
1086 len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), NULL );
1087
1088 tmp = LDAP_MALLOC( len );
1089 key.bv_val = (char *) tmp;
1090
1091 if ( !key.bv_val ) {
1092 return -1;
1093 }
1094
1095 key.bv_len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), &tmp );
1096
1097 if ( hashalg ) {
1098 const EVP_MD *md;
1099 EVP_MD_CTX *mdctx;
1100 unsigned int len = keyhash.bv_len;
1101
1102 md = EVP_get_digestbyname( hashalg );
1103 if ( !md ) {
1104 Debug1( LDAP_DEBUG_TRACE, "tlso_session_pinning: "
1105 "hash %s not recognised by OpenSSL\n", hashalg );
1106 rc = -1;
1107 goto done;
1108 }
1109
1110 #if OPENSSL_VERSION_NUMBER >= 0x10100000
1111 mdctx = EVP_MD_CTX_new();
1112 #else
1113 mdctx = EVP_MD_CTX_create();
1114 #endif
1115 if ( !mdctx ) {
1116 rc = -1;
1117 goto done;
1118 }
1119
1120 EVP_DigestInit_ex( mdctx, md, NULL );
1121 EVP_DigestUpdate( mdctx, key.bv_val, key.bv_len );
1122 EVP_DigestFinal_ex( mdctx, (unsigned char *)keyhash.bv_val, &len );
1123 keyhash.bv_len = len;
1124 #if OPENSSL_VERSION_NUMBER >= 0x10100000
1125 EVP_MD_CTX_free( mdctx );
1126 #else
1127 EVP_MD_CTX_destroy( mdctx );
1128 #endif
1129 } else {
1130 keyhash = key;
1131 }
1132
1133 if ( ber_bvcmp( hash, &keyhash ) ) {
1134 rc = LDAP_CONNECT_ERROR;
1135 Debug0( LDAP_DEBUG_ANY, "tlso_session_pinning: "
1136 "public key hash does not match provided pin.\n" );
1137 if ( ld->ld_error ) {
1138 LDAP_FREE( ld->ld_error );
1139 }
1140 ld->ld_error = LDAP_STRDUP(
1141 _("TLS: public key hash does not match provided pin"));
1142 }
1143
1144 done:
1145 LDAP_FREE( key.bv_val );
1146 return rc;
1147 }
1148
1149 /*
1150 * TLS support for LBER Sockbufs
1151 */
1152
1153 struct tls_data {
1154 tlso_session *session;
1155 Sockbuf_IO_Desc *sbiod;
1156 };
1157
1158 #if OPENSSL_VERSION_NUMBER < 0x10100000
1159 #define BIO_set_init(b, x) b->init = x
1160 #define BIO_set_data(b, x) b->ptr = x
1161 #define BIO_clear_flags(b, x) b->flags &= ~(x)
1162 #define BIO_get_data(b) b->ptr
1163 #endif
1164 static int
tlso_bio_create(BIO * b)1165 tlso_bio_create( BIO *b ) {
1166 BIO_set_init( b, 1 );
1167 BIO_set_data( b, NULL );
1168 BIO_clear_flags( b, ~0 );
1169 return 1;
1170 }
1171
1172 static int
tlso_bio_destroy(BIO * b)1173 tlso_bio_destroy( BIO *b )
1174 {
1175 if ( b == NULL ) return 0;
1176
1177 BIO_set_data( b, NULL ); /* sb_tls_remove() will free it */
1178 BIO_set_init( b, 0 );
1179 BIO_clear_flags( b, ~0 );
1180 return 1;
1181 }
1182
1183 static int
tlso_bio_read(BIO * b,char * buf,int len)1184 tlso_bio_read( BIO *b, char *buf, int len )
1185 {
1186 struct tls_data *p;
1187 int ret;
1188
1189 if ( buf == NULL || len <= 0 ) return 0;
1190
1191 p = (struct tls_data *)BIO_get_data(b);
1192
1193 if ( p == NULL || p->sbiod == NULL ) {
1194 return 0;
1195 }
1196
1197 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
1198
1199 BIO_clear_retry_flags( b );
1200 if ( ret < 0 ) {
1201 int err = sock_errno();
1202 if ( err == EAGAIN || err == EWOULDBLOCK ) {
1203 BIO_set_retry_read( b );
1204 }
1205 }
1206
1207 return ret;
1208 }
1209
1210 static int
tlso_bio_write(BIO * b,const char * buf,int len)1211 tlso_bio_write( BIO *b, const char *buf, int len )
1212 {
1213 struct tls_data *p;
1214 int ret;
1215
1216 if ( buf == NULL || len <= 0 ) return 0;
1217
1218 p = (struct tls_data *)BIO_get_data(b);
1219
1220 if ( p == NULL || p->sbiod == NULL ) {
1221 return 0;
1222 }
1223
1224 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
1225
1226 BIO_clear_retry_flags( b );
1227 if ( ret < 0 ) {
1228 int err = sock_errno();
1229 if ( err == EAGAIN || err == EWOULDBLOCK ) {
1230 BIO_set_retry_write( b );
1231 }
1232 }
1233
1234 return ret;
1235 }
1236
1237 static long
tlso_bio_ctrl(BIO * b,int cmd,long num,void * ptr)1238 tlso_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
1239 {
1240 if ( cmd == BIO_CTRL_FLUSH ) {
1241 /* The OpenSSL library needs this */
1242 return 1;
1243 }
1244 return 0;
1245 }
1246
1247 static int
tlso_bio_gets(BIO * b,char * buf,int len)1248 tlso_bio_gets( BIO *b, char *buf, int len )
1249 {
1250 return -1;
1251 }
1252
1253 static int
tlso_bio_puts(BIO * b,const char * str)1254 tlso_bio_puts( BIO *b, const char *str )
1255 {
1256 return tlso_bio_write( b, str, strlen( str ) );
1257 }
1258
1259 static BIO_METHOD *
tlso_bio_setup(void)1260 tlso_bio_setup( void )
1261 {
1262 /* it's a source/sink BIO */
1263 BIO_METHOD * method = BIO_meth_new( 100 | 0x400, "sockbuf glue" );
1264 BIO_meth_set_write( method, tlso_bio_write );
1265 BIO_meth_set_read( method, tlso_bio_read );
1266 BIO_meth_set_puts( method, tlso_bio_puts );
1267 BIO_meth_set_gets( method, tlso_bio_gets );
1268 BIO_meth_set_ctrl( method, tlso_bio_ctrl );
1269 BIO_meth_set_create( method, tlso_bio_create );
1270 BIO_meth_set_destroy( method, tlso_bio_destroy );
1271
1272 return method;
1273 }
1274
1275 static int
tlso_sb_setup(Sockbuf_IO_Desc * sbiod,void * arg)1276 tlso_sb_setup( Sockbuf_IO_Desc *sbiod, void *arg )
1277 {
1278 struct tls_data *p;
1279 BIO *bio;
1280
1281 assert( sbiod != NULL );
1282
1283 p = LBER_MALLOC( sizeof( *p ) );
1284 if ( p == NULL ) {
1285 return -1;
1286 }
1287
1288 p->session = arg;
1289 p->sbiod = sbiod;
1290 bio = BIO_new( tlso_bio_method );
1291 BIO_set_data( bio, p );
1292 SSL_set_bio( p->session, bio, bio );
1293 sbiod->sbiod_pvt = p;
1294 return 0;
1295 }
1296
1297 static int
tlso_sb_remove(Sockbuf_IO_Desc * sbiod)1298 tlso_sb_remove( Sockbuf_IO_Desc *sbiod )
1299 {
1300 struct tls_data *p;
1301
1302 assert( sbiod != NULL );
1303 assert( sbiod->sbiod_pvt != NULL );
1304
1305 p = (struct tls_data *)sbiod->sbiod_pvt;
1306 SSL_free( p->session );
1307 LBER_FREE( sbiod->sbiod_pvt );
1308 sbiod->sbiod_pvt = NULL;
1309 return 0;
1310 }
1311
1312 static int
tlso_sb_close(Sockbuf_IO_Desc * sbiod)1313 tlso_sb_close( Sockbuf_IO_Desc *sbiod )
1314 {
1315 struct tls_data *p;
1316
1317 assert( sbiod != NULL );
1318 assert( sbiod->sbiod_pvt != NULL );
1319
1320 p = (struct tls_data *)sbiod->sbiod_pvt;
1321 SSL_shutdown( p->session );
1322 return 0;
1323 }
1324
1325 static int
tlso_sb_ctrl(Sockbuf_IO_Desc * sbiod,int opt,void * arg)1326 tlso_sb_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
1327 {
1328 struct tls_data *p;
1329
1330 assert( sbiod != NULL );
1331 assert( sbiod->sbiod_pvt != NULL );
1332
1333 p = (struct tls_data *)sbiod->sbiod_pvt;
1334
1335 if ( opt == LBER_SB_OPT_GET_SSL ) {
1336 *((tlso_session **)arg) = p->session;
1337 return 1;
1338
1339 } else if ( opt == LBER_SB_OPT_DATA_READY ) {
1340 if( SSL_pending( p->session ) > 0 ) {
1341 return 1;
1342 }
1343 }
1344
1345 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
1346 }
1347
1348 static ber_slen_t
tlso_sb_read(Sockbuf_IO_Desc * sbiod,void * buf,ber_len_t len)1349 tlso_sb_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
1350 {
1351 struct tls_data *p;
1352 ber_slen_t ret;
1353 int err;
1354
1355 assert( sbiod != NULL );
1356 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
1357
1358 p = (struct tls_data *)sbiod->sbiod_pvt;
1359
1360 ret = SSL_read( p->session, (char *)buf, len );
1361 #ifdef HAVE_WINSOCK
1362 errno = WSAGetLastError();
1363 #endif
1364 err = SSL_get_error( p->session, ret );
1365 if (err == SSL_ERROR_WANT_READ ) {
1366 sbiod->sbiod_sb->sb_trans_needs_read = 1;
1367 sock_errset(EWOULDBLOCK);
1368 }
1369 else
1370 sbiod->sbiod_sb->sb_trans_needs_read = 0;
1371 return ret;
1372 }
1373
1374 static ber_slen_t
tlso_sb_write(Sockbuf_IO_Desc * sbiod,void * buf,ber_len_t len)1375 tlso_sb_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
1376 {
1377 struct tls_data *p;
1378 ber_slen_t ret;
1379 int err;
1380
1381 assert( sbiod != NULL );
1382 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
1383
1384 p = (struct tls_data *)sbiod->sbiod_pvt;
1385
1386 ret = SSL_write( p->session, (char *)buf, len );
1387 #ifdef HAVE_WINSOCK
1388 errno = WSAGetLastError();
1389 #endif
1390 err = SSL_get_error( p->session, ret );
1391 if (err == SSL_ERROR_WANT_WRITE ) {
1392 sbiod->sbiod_sb->sb_trans_needs_write = 1;
1393 sock_errset(EWOULDBLOCK);
1394
1395 } else {
1396 sbiod->sbiod_sb->sb_trans_needs_write = 0;
1397 }
1398 return ret;
1399 }
1400
1401 static Sockbuf_IO tlso_sbio =
1402 {
1403 tlso_sb_setup, /* sbi_setup */
1404 tlso_sb_remove, /* sbi_remove */
1405 tlso_sb_ctrl, /* sbi_ctrl */
1406 tlso_sb_read, /* sbi_read */
1407 tlso_sb_write, /* sbi_write */
1408 tlso_sb_close /* sbi_close */
1409 };
1410
1411 /* Derived from openssl/apps/s_cb.c */
1412 static void
tlso_info_cb(const SSL * ssl,int where,int ret)1413 tlso_info_cb( const SSL *ssl, int where, int ret )
1414 {
1415 int w;
1416 char *op;
1417 char *state = (char *) SSL_state_string_long( (SSL *)ssl );
1418
1419 w = where & ~SSL_ST_MASK;
1420 if ( w & SSL_ST_CONNECT ) {
1421 op = "SSL_connect";
1422 } else if ( w & SSL_ST_ACCEPT ) {
1423 op = "SSL_accept";
1424 } else {
1425 op = "undefined";
1426 }
1427
1428 #ifdef HAVE_EBCDIC
1429 if ( state ) {
1430 state = LDAP_STRDUP( state );
1431 __etoa( state );
1432 }
1433 #endif
1434 if ( where & SSL_CB_LOOP ) {
1435 Debug2( LDAP_DEBUG_TRACE,
1436 "TLS trace: %s:%s\n",
1437 op, state );
1438
1439 } else if ( where & SSL_CB_ALERT ) {
1440 char *atype = (char *) SSL_alert_type_string_long( ret );
1441 char *adesc = (char *) SSL_alert_desc_string_long( ret );
1442 op = ( where & SSL_CB_READ ) ? "read" : "write";
1443 #ifdef HAVE_EBCDIC
1444 if ( atype ) {
1445 atype = LDAP_STRDUP( atype );
1446 __etoa( atype );
1447 }
1448 if ( adesc ) {
1449 adesc = LDAP_STRDUP( adesc );
1450 __etoa( adesc );
1451 }
1452 #endif
1453 Debug3( LDAP_DEBUG_TRACE,
1454 "TLS trace: SSL3 alert %s:%s:%s\n",
1455 op, atype, adesc );
1456 #ifdef HAVE_EBCDIC
1457 if ( atype ) LDAP_FREE( atype );
1458 if ( adesc ) LDAP_FREE( adesc );
1459 #endif
1460 } else if ( where & SSL_CB_EXIT ) {
1461 if ( ret == 0 ) {
1462 Debug2( LDAP_DEBUG_TRACE,
1463 "TLS trace: %s:failed in %s\n",
1464 op, state );
1465 } else if ( ret < 0 ) {
1466 Debug2( LDAP_DEBUG_TRACE,
1467 "TLS trace: %s:error in %s\n",
1468 op, state );
1469 }
1470 }
1471 #ifdef HAVE_EBCDIC
1472 if ( state ) LDAP_FREE( state );
1473 #endif
1474 }
1475
1476 static int
tlso_verify_cb(int ok,X509_STORE_CTX * ctx)1477 tlso_verify_cb( int ok, X509_STORE_CTX *ctx )
1478 {
1479 X509 *cert;
1480 int errnum;
1481 int errdepth;
1482 X509_NAME *subject;
1483 X509_NAME *issuer;
1484 char *sname;
1485 char *iname;
1486 char *certerr = NULL;
1487
1488 cert = X509_STORE_CTX_get_current_cert( ctx );
1489 errnum = X509_STORE_CTX_get_error( ctx );
1490 errdepth = X509_STORE_CTX_get_error_depth( ctx );
1491
1492 /*
1493 * X509_get_*_name return pointers to the internal copies of
1494 * those things requested. So do not free them.
1495 */
1496 subject = X509_get_subject_name( cert );
1497 issuer = X509_get_issuer_name( cert );
1498 /* X509_NAME_oneline, if passed a NULL buf, allocate memory */
1499 sname = X509_NAME_oneline( subject, NULL, 0 );
1500 iname = X509_NAME_oneline( issuer, NULL, 0 );
1501 if ( !ok ) certerr = (char *)X509_verify_cert_error_string( errnum );
1502 #ifdef HAVE_EBCDIC
1503 if ( sname ) __etoa( sname );
1504 if ( iname ) __etoa( iname );
1505 if ( certerr ) {
1506 certerr = LDAP_STRDUP( certerr );
1507 __etoa( certerr );
1508 }
1509 #endif
1510 Debug3( LDAP_DEBUG_TRACE,
1511 "TLS certificate verification: depth: %d, err: %d, subject: %s,",
1512 errdepth, errnum,
1513 sname ? sname : "-unknown-" );
1514 Debug1( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-" );
1515 if ( !ok ) {
1516 Debug1( LDAP_DEBUG_ANY,
1517 "TLS certificate verification: Error, %s\n",
1518 certerr );
1519 }
1520 if ( sname )
1521 OPENSSL_free ( sname );
1522 if ( iname )
1523 OPENSSL_free ( iname );
1524 #ifdef HAVE_EBCDIC
1525 if ( certerr ) LDAP_FREE( certerr );
1526 #endif
1527 return ok;
1528 }
1529
1530 static int
tlso_verify_ok(int ok,X509_STORE_CTX * ctx)1531 tlso_verify_ok( int ok, X509_STORE_CTX *ctx )
1532 {
1533 (void) tlso_verify_cb( ok, ctx );
1534 return 1;
1535 }
1536
1537 /* Inspired by ERR_print_errors in OpenSSL */
1538 static void
tlso_report_error(void)1539 tlso_report_error( void )
1540 {
1541 unsigned long l;
1542 char buf[200];
1543 const char *file;
1544 int line;
1545
1546 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
1547 ERR_error_string_n( l, buf, sizeof( buf ) );
1548 #ifdef HAVE_EBCDIC
1549 if ( file ) {
1550 file = LDAP_STRDUP( file );
1551 __etoa( (char *)file );
1552 }
1553 __etoa( buf );
1554 #endif
1555 Debug3( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
1556 buf, file, line );
1557 #ifdef HAVE_EBCDIC
1558 if ( file ) LDAP_FREE( (void *)file );
1559 #endif
1560 }
1561 }
1562
1563 #if OPENSSL_VERSION_NUMBER < 0x10100000
1564 static RSA *
tlso_tmp_rsa_cb(SSL * ssl,int is_export,int key_length)1565 tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
1566 {
1567 RSA *tmp_rsa;
1568 /* FIXME: Pregenerate the key on startup */
1569 /* FIXME: Who frees the key? */
1570 BIGNUM *bn = BN_new();
1571 tmp_rsa = NULL;
1572 if ( bn ) {
1573 if ( BN_set_word( bn, RSA_F4 )) {
1574 tmp_rsa = RSA_new();
1575 if ( tmp_rsa && !RSA_generate_key_ex( tmp_rsa, key_length, bn, NULL )) {
1576 RSA_free( tmp_rsa );
1577 tmp_rsa = NULL;
1578 }
1579 }
1580 BN_free( bn );
1581 }
1582
1583 if ( !tmp_rsa ) {
1584 Debug2( LDAP_DEBUG_ANY,
1585 "TLS: Failed to generate temporary %d-bit %s RSA key\n",
1586 key_length, is_export ? "export" : "domestic" );
1587 }
1588 return tmp_rsa;
1589 }
1590 #endif /* OPENSSL_VERSION_NUMBER < 1.1 */
1591
1592 static int
tlso_seed_PRNG(const char * randfile)1593 tlso_seed_PRNG( const char *randfile )
1594 {
1595 #ifndef URANDOM_DEVICE
1596 /* no /dev/urandom (or equiv) */
1597 long total=0;
1598 char buffer[MAXPATHLEN];
1599
1600 if (randfile == NULL) {
1601 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
1602 * If $HOME is not set or buffer too small to hold the pathname,
1603 * an error occurs. - From RAND_file_name() man page.
1604 * The fact is that when $HOME is NULL, .rnd is used.
1605 */
1606 randfile = RAND_file_name( buffer, sizeof( buffer ) );
1607 }
1608 #ifndef OPENSSL_NO_EGD
1609 else if (RAND_egd(randfile) > 0) {
1610 /* EGD socket */
1611 return 0;
1612 }
1613 #endif
1614
1615 if (randfile == NULL) {
1616 Debug0( LDAP_DEBUG_ANY,
1617 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n" );
1618 return -1;
1619 }
1620
1621 total = RAND_load_file(randfile, -1);
1622
1623 if (RAND_status() == 0) {
1624 Debug0( LDAP_DEBUG_ANY,
1625 "TLS: PRNG not been seeded with enough data\n" );
1626 return -1;
1627 }
1628
1629 /* assume if there was enough bits to seed that it's okay
1630 * to write derived bits to the file
1631 */
1632 RAND_write_file(randfile);
1633
1634 #endif
1635
1636 return 0;
1637 }
1638
1639
1640 tls_impl ldap_int_tls_impl = {
1641 "OpenSSL",
1642
1643 tlso_init,
1644 tlso_destroy,
1645
1646 tlso_ctx_new,
1647 tlso_ctx_ref,
1648 tlso_ctx_free,
1649 tlso_ctx_init,
1650
1651 tlso_session_new,
1652 tlso_session_connect,
1653 tlso_session_accept,
1654 tlso_session_upflags,
1655 tlso_session_errmsg,
1656 tlso_session_my_dn,
1657 tlso_session_peer_dn,
1658 tlso_session_chkhost,
1659 tlso_session_strength,
1660 tlso_session_unique,
1661 tlso_session_endpoint,
1662 tlso_session_version,
1663 tlso_session_cipher,
1664 tlso_session_peercert,
1665 tlso_session_pinning,
1666
1667 &tlso_sbio,
1668
1669 #ifdef LDAP_R_COMPILE
1670 tlso_thr_init,
1671 #else
1672 NULL,
1673 #endif
1674
1675 0
1676 };
1677
1678 #endif /* HAVE_OPENSSL */
1679