1 /* tls_o.c - Handle tls/ssl using OpenSSL */
2 /* $OpenLDAP$ */
3 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
4 *
5 * Copyright 2008-2021 The OpenLDAP Foundation.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted only as authorized by the OpenLDAP
10 * Public License.
11 *
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>.
15 */
16 /* ACKNOWLEDGEMENTS: Rewritten by Howard Chu
17 */
18
19 #include "portable.h"
20
21 #ifdef HAVE_OPENSSL
22
23 #include "ldap_config.h"
24
25 #include <stdio.h>
26
27 #include <ac/stdlib.h>
28 #include <ac/errno.h>
29 #include <ac/socket.h>
30 #include <ac/string.h>
31 #include <ac/ctype.h>
32 #include <ac/time.h>
33 #include <ac/unistd.h>
34 #include <ac/param.h>
35 #include <ac/dirent.h>
36
37 #include "ldap-int.h"
38 #include "ldap-tls.h"
39
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 #include <openssl/bn.h>
47 #include <openssl/rsa.h>
48 #include <openssl/dh.h>
49 #endif
50
51 #if OPENSSL_VERSION_NUMBER >= 0x10100000
52 #define ASN1_STRING_data(x) ASN1_STRING_get0_data(x)
53 #endif
54
55 typedef SSL_CTX tlso_ctx;
56 typedef SSL tlso_session;
57
58 static BIO_METHOD * tlso_bio_method = NULL;
59 static BIO_METHOD * tlso_bio_setup( void );
60
61 static int tlso_opt_trace = 1;
62
63 static void tlso_report_error( void );
64
65 static void tlso_info_cb( const SSL *ssl, int where, int ret );
66 static int tlso_verify_cb( int ok, X509_STORE_CTX *ctx );
67 static int tlso_verify_ok( int ok, X509_STORE_CTX *ctx );
68 static int tlso_seed_PRNG( const char *randfile );
69 #if OPENSSL_VERSION_NUMBER < 0x10100000
70 /*
71 * OpenSSL 1.1 API and later has new locking code
72 */
73 static RSA * tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length );
74
75 #ifdef LDAP_R_COMPILE
76 /*
77 * provide mutexes for the OpenSSL library.
78 */
79 static ldap_pvt_thread_mutex_t tlso_mutexes[CRYPTO_NUM_LOCKS];
80
tlso_locking_cb(int mode,int type,const char * file,int line)81 static void tlso_locking_cb( int mode, int type, const char *file, int line )
82 {
83 if ( mode & CRYPTO_LOCK ) {
84 ldap_pvt_thread_mutex_lock( &tlso_mutexes[type] );
85 } else {
86 ldap_pvt_thread_mutex_unlock( &tlso_mutexes[type] );
87 }
88 }
89
90 #if OPENSSL_VERSION_NUMBER >= 0x0909000
tlso_thread_self(CRYPTO_THREADID * id)91 static void tlso_thread_self( CRYPTO_THREADID *id )
92 {
93 CRYPTO_THREADID_set_pointer( id, (void *)ldap_pvt_thread_self() );
94 }
95 #define CRYPTO_set_id_callback(foo) CRYPTO_THREADID_set_callback(foo)
96 #else
tlso_thread_self(void)97 static unsigned long tlso_thread_self( void )
98 {
99 /* FIXME: CRYPTO_set_id_callback only works when ldap_pvt_thread_t
100 * is an integral type that fits in an unsigned long
101 */
102
103 /* force an error if the ldap_pvt_thread_t type is too large */
104 enum { ok = sizeof( ldap_pvt_thread_t ) <= sizeof( unsigned long ) };
105 typedef struct { int dummy: ok ? 1 : -1; } Check[ok ? 1 : -1];
106
107 return (unsigned long) ldap_pvt_thread_self();
108 }
109 #endif
110
tlso_thr_init(void)111 static void tlso_thr_init( void )
112 {
113 int i;
114
115 for( i=0; i< CRYPTO_NUM_LOCKS ; i++ ) {
116 ldap_pvt_thread_mutex_init( &tlso_mutexes[i] );
117 }
118 CRYPTO_set_locking_callback( tlso_locking_cb );
119 CRYPTO_set_id_callback( tlso_thread_self );
120 }
121 #endif /* LDAP_R_COMPILE */
122 #else
123 #ifdef LDAP_R_COMPILE
tlso_thr_init(void)124 static void tlso_thr_init( void ) {}
125 #endif
126 #endif /* OpenSSL 1.1 */
127
128 #if OPENSSL_VERSION_NUMBER < 0x10100000
129 /*
130 * OpenSSL 1.1 API and later makes the BIO method concrete types internal.
131 */
132
133 static BIO_METHOD *
BIO_meth_new(int type,const char * name)134 BIO_meth_new( int type, const char *name )
135 {
136 BIO_METHOD *method = LDAP_MALLOC( sizeof(BIO_METHOD) );
137 memset( method, 0, sizeof(BIO_METHOD) );
138
139 method->type = type;
140 method->name = name;
141
142 return method;
143 }
144
145 static void
BIO_meth_free(BIO_METHOD * meth)146 BIO_meth_free( BIO_METHOD *meth )
147 {
148 if ( meth == NULL ) {
149 return;
150 }
151
152 LDAP_FREE( meth );
153 }
154
155 #define BIO_meth_set_write(m, f) (m)->bwrite = (f)
156 #define BIO_meth_set_read(m, f) (m)->bread = (f)
157 #define BIO_meth_set_puts(m, f) (m)->bputs = (f)
158 #define BIO_meth_set_gets(m, f) (m)->bgets = (f)
159 #define BIO_meth_set_ctrl(m, f) (m)->ctrl = (f)
160 #define BIO_meth_set_create(m, f) (m)->create = (f)
161 #define BIO_meth_set_destroy(m, f) (m)->destroy = (f)
162
163 #endif /* OpenSSL 1.1 */
164
STACK_OF(X509_NAME)165 static STACK_OF(X509_NAME) *
166 tlso_ca_list( char * bundle, char * dir, X509 *cert )
167 {
168 STACK_OF(X509_NAME) *ca_list = NULL;
169
170 if ( bundle ) {
171 ca_list = SSL_load_client_CA_file( bundle );
172 }
173 #if defined(HAVE_DIRENT_H) || defined(dirent)
174 if ( dir ) {
175 int freeit = 0;
176
177 if ( !ca_list ) {
178 ca_list = sk_X509_NAME_new_null();
179 freeit = 1;
180 }
181 if ( !SSL_add_dir_cert_subjects_to_stack( ca_list, dir ) &&
182 freeit ) {
183 sk_X509_NAME_free( ca_list );
184 ca_list = NULL;
185 }
186 }
187 #endif
188 if ( cert ) {
189 X509_NAME *xn = X509_get_subject_name( cert );
190 xn = X509_NAME_dup( xn );
191 if ( !ca_list )
192 ca_list = sk_X509_NAME_new_null();
193 if ( xn && ca_list )
194 sk_X509_NAME_push( ca_list, xn );
195 }
196 return ca_list;
197 }
198
199 /*
200 * Initialize TLS subsystem. Should be called only once.
201 */
202 static int
tlso_init(void)203 tlso_init( void )
204 {
205 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
206 #ifdef HAVE_EBCDIC
207 {
208 char *file = LDAP_STRDUP( lo->ldo_tls_randfile );
209 if ( file ) __atoe( file );
210 (void) tlso_seed_PRNG( file );
211 LDAP_FREE( file );
212 }
213 #else
214 (void) tlso_seed_PRNG( lo->ldo_tls_randfile );
215 #endif
216
217 #if OPENSSL_VERSION_NUMBER < 0x10100000
218 SSL_load_error_strings();
219 SSL_library_init();
220 OpenSSL_add_all_digests();
221 #else
222 OPENSSL_init_ssl(0, NULL);
223 #endif
224
225 /* FIXME: mod_ssl does this */
226 X509V3_add_standard_extensions();
227
228 tlso_bio_method = tlso_bio_setup();
229
230 return 0;
231 }
232
233 /*
234 * Tear down the TLS subsystem. Should only be called once.
235 */
236 static void
tlso_destroy(void)237 tlso_destroy( void )
238 {
239 struct ldapoptions *lo = LDAP_INT_GLOBAL_OPT();
240
241 BIO_meth_free( tlso_bio_method );
242
243 #if OPENSSL_VERSION_NUMBER < 0x10100000
244 EVP_cleanup();
245 ERR_remove_thread_state(NULL);
246 ERR_free_strings();
247 #endif
248
249 if ( lo->ldo_tls_randfile ) {
250 LDAP_FREE( lo->ldo_tls_randfile );
251 lo->ldo_tls_randfile = NULL;
252 }
253 }
254
255 static tls_ctx *
tlso_ctx_new(struct ldapoptions * lo)256 tlso_ctx_new( struct ldapoptions *lo )
257 {
258 return (tls_ctx *) SSL_CTX_new( SSLv23_method() );
259 }
260
261 static void
tlso_ctx_ref(tls_ctx * ctx)262 tlso_ctx_ref( tls_ctx *ctx )
263 {
264 tlso_ctx *c = (tlso_ctx *)ctx;
265 #if OPENSSL_VERSION_NUMBER < 0x10100000
266 #define SSL_CTX_up_ref(ctx) CRYPTO_add( &(ctx->references), 1, CRYPTO_LOCK_SSL_CTX )
267 #endif
268 SSL_CTX_up_ref( c );
269 }
270
271 static void
tlso_ctx_free(tls_ctx * ctx)272 tlso_ctx_free ( tls_ctx *ctx )
273 {
274 tlso_ctx *c = (tlso_ctx *)ctx;
275 SSL_CTX_free( c );
276 }
277
278 #if OPENSSL_VERSION_NUMBER >= 0x10101000 && !defined(OPENSSL_NO_TLS1_3)
279 static char *
tlso_stecpy(char * dst,const char * src,const char * end)280 tlso_stecpy( char *dst, const char *src, const char *end )
281 {
282 while ( dst < end && *src )
283 *dst++ = *src++;
284 if ( dst < end )
285 *dst = '\0';
286 return dst;
287 }
288
289 /* OpenSSL 1.1.1 uses a separate API for TLS1.3 ciphersuites.
290 * Try to find any TLS1.3 ciphers in the given list of suites.
291 */
292 static void
tlso_ctx_cipher13(tlso_ctx * ctx,char * suites)293 tlso_ctx_cipher13( tlso_ctx *ctx, char *suites )
294 {
295 char tls13_suites[1024], *ts = tls13_suites, *te = tls13_suites + sizeof(tls13_suites);
296 char *ptr, *colon, *nptr;
297 char sname[128];
298 STACK_OF(SSL_CIPHER) *cs;
299 SSL *s = SSL_new( ctx );
300 int ret;
301
302 if ( !s )
303 return;
304
305 *ts = '\0';
306
307 /* check individual suites in a separate SSL handle before
308 * mucking with the provided ctx. Init it to a known
309 * mostly-empty state.
310 */
311 SSL_set_ciphersuites( s, "" );
312 SSL_set_cipher_list( s, SSL3_TXT_RSA_NULL_SHA );
313
314 for ( ptr = suites;; ) {
315 colon = strchr( ptr, ':' );
316 if ( colon ) {
317 int len = colon - ptr;
318 if ( len > 63 ) len = 63;
319 strncpy( sname, ptr, len );
320 sname[len] = '\0';
321 nptr = sname;
322 } else {
323 nptr = ptr;
324 }
325 if ( SSL_set_ciphersuites( s, nptr )) {
326 cs = SSL_get_ciphers( s );
327 if ( cs ) {
328 const char *ver = SSL_CIPHER_get_version( sk_SSL_CIPHER_value( cs, 0 ));
329 if ( !strncmp( ver, "TLSv", 4 ) && strncmp( ver+4, "1.3", 3 ) >= 0 ) {
330 if ( tls13_suites[0] )
331 ts = tlso_stecpy( ts, ":", te );
332 ts = tlso_stecpy( ts, sname, te );
333 }
334 }
335 }
336 if ( !colon || ts >= te )
337 break;
338 ptr = colon+1;
339 }
340 SSL_free( s );
341
342 /* If no TLS1.3 ciphersuites were specified, leave current settings untouched. */
343 if ( tls13_suites[0] )
344 SSL_CTX_set_ciphersuites( ctx, tls13_suites );
345 }
346 #endif /* OpenSSL 1.1.1 */
347
348 /*
349 * initialize a new TLS context
350 */
351 static int
tlso_ctx_init(struct ldapoptions * lo,struct ldaptls * lt,int is_server)352 tlso_ctx_init( struct ldapoptions *lo, struct ldaptls *lt, int is_server )
353 {
354 tlso_ctx *ctx = (tlso_ctx *)lo->ldo_tls_ctx;
355 int i;
356
357 if ( is_server ) {
358 SSL_CTX_set_session_id_context( ctx,
359 (const unsigned char *) "OpenLDAP", sizeof("OpenLDAP")-1 );
360 }
361
362 if ( lo->ldo_tls_protocol_min ) {
363 int opt = 0;
364 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL2 ) {
365 opt |= SSL_OP_NO_SSLv2;
366 SSL_CTX_clear_options( ctx, SSL_OP_NO_SSLv3 );
367 }
368 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
369 opt |= SSL_OP_NO_SSLv3;
370 #ifdef SSL_OP_NO_TLSv1
371 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
372 opt |= SSL_OP_NO_TLSv1;
373 #endif
374 #ifdef SSL_OP_NO_TLSv1_1
375 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
376 opt |= SSL_OP_NO_TLSv1_1;
377 #endif
378 #ifdef SSL_OP_NO_TLSv1_2
379 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
380 opt |= SSL_OP_NO_TLSv1_2;
381 #endif
382 #ifdef SSL_OP_NO_TLSv1_3
383 if ( lo->ldo_tls_protocol_min > LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
384 opt |= SSL_OP_NO_TLSv1_3;
385 #endif
386 if ( opt )
387 SSL_CTX_set_options( ctx, opt );
388 }
389 if ( lo->ldo_tls_protocol_max ) {
390 int opt = 0;
391 #ifdef SSL_OP_NO_TLSv1_3
392 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_3 )
393 opt |= SSL_OP_NO_TLSv1_3;
394 #endif
395 #ifdef SSL_OP_NO_TLSv1_2
396 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_2 )
397 opt |= SSL_OP_NO_TLSv1_2;
398 #endif
399 #ifdef SSL_OP_NO_TLSv1_1
400 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_1 )
401 opt |= SSL_OP_NO_TLSv1_1;
402 #endif
403 #ifdef SSL_OP_NO_TLSv1
404 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_TLS1_0 )
405 opt |= SSL_OP_NO_TLSv1;
406 #endif
407 if ( lo->ldo_tls_protocol_max < LDAP_OPT_X_TLS_PROTOCOL_SSL3 )
408 opt |= SSL_OP_NO_SSLv3;
409 if ( opt )
410 SSL_CTX_set_options( ctx, opt );
411 }
412
413 if ( lo->ldo_tls_ciphersuite ) {
414 #if OPENSSL_VERSION_NUMBER >= 0x10101000 && !defined(OPENSSL_NO_TLS1_3)
415 tlso_ctx_cipher13( ctx, lt->lt_ciphersuite );
416 #endif
417 if ( !SSL_CTX_set_cipher_list( ctx, lt->lt_ciphersuite ) )
418 {
419 Debug1( LDAP_DEBUG_ANY,
420 "TLS: could not set cipher list %s.\n",
421 lo->ldo_tls_ciphersuite );
422 tlso_report_error();
423 return -1;
424 }
425 }
426
427 if ( lo->ldo_tls_cacertfile == NULL && lo->ldo_tls_cacertdir == NULL &&
428 lo->ldo_tls_cacert.bv_val == NULL ) {
429 if ( !SSL_CTX_set_default_verify_paths( ctx ) ) {
430 Debug0( LDAP_DEBUG_ANY, "TLS: "
431 "could not use default certificate paths" );
432 tlso_report_error();
433 return -1;
434 }
435 } else {
436 X509 *cert = NULL;
437 if ( lo->ldo_tls_cacert.bv_val ) {
438 const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cacert.bv_val);
439 cert = d2i_X509( NULL, &pp, lo->ldo_tls_cacert.bv_len );
440 X509_STORE *store = SSL_CTX_get_cert_store( ctx );
441 if ( !X509_STORE_add_cert( store, cert )) {
442 Debug0( LDAP_DEBUG_ANY, "TLS: "
443 "could not use CA certificate" );
444 tlso_report_error();
445 return -1;
446 }
447 }
448 if (( lt->lt_cacertfile || lt->lt_cacertdir ) && !SSL_CTX_load_verify_locations( ctx,
449 lt->lt_cacertfile, lt->lt_cacertdir ) )
450 {
451 Debug2( LDAP_DEBUG_ANY, "TLS: "
452 "could not load verify locations (file:`%s',dir:`%s').\n",
453 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
454 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "" );
455 tlso_report_error();
456 return -1;
457 }
458
459 if ( is_server ) {
460 STACK_OF(X509_NAME) *calist;
461 /* List of CA names to send to a client */
462 calist = tlso_ca_list( lt->lt_cacertfile, lt->lt_cacertdir, cert );
463 if ( !calist ) {
464 Debug2( LDAP_DEBUG_ANY, "TLS: "
465 "could not load client CA list (file:`%s',dir:`%s').\n",
466 lo->ldo_tls_cacertfile ? lo->ldo_tls_cacertfile : "",
467 lo->ldo_tls_cacertdir ? lo->ldo_tls_cacertdir : "" );
468 tlso_report_error();
469 return -1;
470 }
471
472 SSL_CTX_set_client_CA_list( ctx, calist );
473 }
474 if ( cert )
475 X509_free( cert );
476 }
477
478 if ( lo->ldo_tls_cert.bv_val )
479 {
480 const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_cert.bv_val);
481 X509 *cert = d2i_X509( NULL, &pp, lo->ldo_tls_cert.bv_len );
482 if ( !SSL_CTX_use_certificate( ctx, cert )) {
483 Debug0( LDAP_DEBUG_ANY,
484 "TLS: could not use certificate.\n" );
485 tlso_report_error();
486 return -1;
487 }
488 X509_free( cert );
489 } else
490 if ( lo->ldo_tls_certfile &&
491 !SSL_CTX_use_certificate_chain_file( ctx, lt->lt_certfile) )
492 {
493 Debug1( LDAP_DEBUG_ANY,
494 "TLS: could not use certificate file `%s'.\n",
495 lo->ldo_tls_certfile );
496 tlso_report_error();
497 return -1;
498 }
499
500 /* Key validity is checked automatically if cert has already been set */
501 if ( lo->ldo_tls_key.bv_val )
502 {
503 const unsigned char *pp = (const unsigned char *) (lo->ldo_tls_key.bv_val);
504 EVP_PKEY *pkey = d2i_AutoPrivateKey( NULL, &pp, lo->ldo_tls_key.bv_len );
505 if ( !SSL_CTX_use_PrivateKey( ctx, pkey ))
506 {
507 Debug0( LDAP_DEBUG_ANY,
508 "TLS: could not use private key.\n" );
509 tlso_report_error();
510 return -1;
511 }
512 EVP_PKEY_free( pkey );
513 } else
514 if ( lo->ldo_tls_keyfile &&
515 !SSL_CTX_use_PrivateKey_file( ctx,
516 lt->lt_keyfile, SSL_FILETYPE_PEM ) )
517 {
518 Debug1( LDAP_DEBUG_ANY,
519 "TLS: could not use key file `%s'.\n",
520 lo->ldo_tls_keyfile );
521 tlso_report_error();
522 return -1;
523 }
524
525 if ( is_server && lo->ldo_tls_dhfile ) {
526 DH *dh;
527 BIO *bio;
528
529 if (( bio=BIO_new_file( lt->lt_dhfile,"r" )) == NULL ) {
530 Debug1( LDAP_DEBUG_ANY,
531 "TLS: could not use DH parameters file `%s'.\n",
532 lo->ldo_tls_dhfile );
533 tlso_report_error();
534 return -1;
535 }
536 if (!( dh=PEM_read_bio_DHparams( bio, NULL, NULL, NULL ))) {
537 Debug1( LDAP_DEBUG_ANY,
538 "TLS: could not read DH parameters file `%s'.\n",
539 lo->ldo_tls_dhfile );
540 tlso_report_error();
541 BIO_free( bio );
542 return -1;
543 }
544 BIO_free( bio );
545 SSL_CTX_set_tmp_dh( ctx, dh );
546 SSL_CTX_set_options( ctx, SSL_OP_SINGLE_DH_USE );
547 DH_free( dh );
548 }
549
550 if ( lo->ldo_tls_ecname ) {
551 #ifdef OPENSSL_NO_EC
552 Debug0( LDAP_DEBUG_ANY,
553 "TLS: Elliptic Curves not supported.\n" );
554 return -1;
555 #else
556 if ( !SSL_CTX_set1_curves_list( ctx, lt->lt_ecname )) {
557 Debug1( LDAP_DEBUG_ANY,
558 "TLS: could not set EC name `%s'.\n",
559 lo->ldo_tls_ecname );
560 tlso_report_error();
561 return -1;
562 }
563 /*
564 * This is a NOP in OpenSSL 1.1.0 and later, where curves are always
565 * auto-negotiated.
566 */
567 #if OPENSSL_VERSION_NUMBER < 0x10100000UL
568 if ( SSL_CTX_set_ecdh_auto( ctx, 1 ) <= 0 ) {
569 Debug0( LDAP_DEBUG_ANY,
570 "TLS: could not enable automatic EC negotiation.\n" );
571 }
572 #endif
573 #endif /* OPENSSL_NO_EC */
574 }
575
576 if ( tlso_opt_trace ) {
577 SSL_CTX_set_info_callback( ctx, tlso_info_cb );
578 }
579
580 i = SSL_VERIFY_NONE;
581 if ( lo->ldo_tls_require_cert ) {
582 i = SSL_VERIFY_PEER;
583 if ( lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_DEMAND ||
584 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_HARD ) {
585 i |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
586 }
587 }
588
589 SSL_CTX_set_verify( ctx, i,
590 lo->ldo_tls_require_cert == LDAP_OPT_X_TLS_ALLOW ?
591 tlso_verify_ok : tlso_verify_cb );
592 #if OPENSSL_VERSION_NUMBER < 0x10100000
593 SSL_CTX_set_tmp_rsa_callback( ctx, tlso_tmp_rsa_cb );
594 #endif
595 if ( lo->ldo_tls_crlcheck ) {
596 X509_STORE *x509_s = SSL_CTX_get_cert_store( ctx );
597 if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_PEER ) {
598 X509_STORE_set_flags( x509_s, X509_V_FLAG_CRL_CHECK );
599 } else if ( lo->ldo_tls_crlcheck == LDAP_OPT_X_TLS_CRL_ALL ) {
600 X509_STORE_set_flags( x509_s,
601 X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL );
602 }
603 }
604 /* Explicitly honor the server side cipher suite preference */
605 SSL_CTX_set_options( ctx, SSL_OP_CIPHER_SERVER_PREFERENCE );
606 return 0;
607 }
608
609 static tls_session *
tlso_session_new(tls_ctx * ctx,int is_server)610 tlso_session_new( tls_ctx *ctx, int is_server )
611 {
612 tlso_ctx *c = (tlso_ctx *)ctx;
613 return (tls_session *)SSL_new( c );
614 }
615
616 static int
tlso_session_connect(LDAP * ld,tls_session * sess,const char * name_in)617 tlso_session_connect( LDAP *ld, tls_session *sess, const char *name_in )
618 {
619 tlso_session *s = (tlso_session *)sess;
620 int rc;
621
622 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
623 if ( name_in ) {
624 rc = SSL_set_tlsext_host_name( s, name_in );
625 if ( !rc ) /* can fail to strdup the name */
626 return -1;
627 }
628 #endif
629 /* Caller expects 0 = success, OpenSSL returns 1 = success */
630 rc = SSL_connect( s ) - 1;
631 return rc;
632 }
633
634 static int
tlso_session_accept(tls_session * sess)635 tlso_session_accept( tls_session *sess )
636 {
637 tlso_session *s = (tlso_session *)sess;
638
639 /* Caller expects 0 = success, OpenSSL returns 1 = success */
640 return SSL_accept( s ) - 1;
641 }
642
643 static int
tlso_session_upflags(Sockbuf * sb,tls_session * sess,int rc)644 tlso_session_upflags( Sockbuf *sb, tls_session *sess, int rc )
645 {
646 tlso_session *s = (tlso_session *)sess;
647
648 /* 1 was subtracted above, offset it back now */
649 rc = SSL_get_error(s, rc+1);
650 if (rc == SSL_ERROR_WANT_READ) {
651 sb->sb_trans_needs_read = 1;
652 return 1;
653
654 } else if (rc == SSL_ERROR_WANT_WRITE) {
655 sb->sb_trans_needs_write = 1;
656 return 1;
657
658 } else if (rc == SSL_ERROR_WANT_CONNECT) {
659 return 1;
660 }
661 return 0;
662 }
663
664 static char *
tlso_session_errmsg(tls_session * sess,int rc,char * buf,size_t len)665 tlso_session_errmsg( tls_session *sess, int rc, char *buf, size_t len )
666 {
667 char err[256] = "";
668 const char *certerr=NULL;
669 tlso_session *s = (tlso_session *)sess;
670
671 rc = ERR_peek_error();
672 if ( rc ) {
673 ERR_error_string_n( rc, err, sizeof(err) );
674 if ( ( ERR_GET_LIB(rc) == ERR_LIB_SSL ) &&
675 ( ERR_GET_REASON(rc) == SSL_R_CERTIFICATE_VERIFY_FAILED ) ) {
676 int certrc = SSL_get_verify_result(s);
677 certerr = (char *)X509_verify_cert_error_string(certrc);
678 }
679 snprintf(buf, len, "%s%s%s%s", err, certerr ? " (" :"",
680 certerr ? certerr : "", certerr ? ")" : "" );
681 return buf;
682 }
683 return NULL;
684 }
685
686 static int
tlso_session_my_dn(tls_session * sess,struct berval * der_dn)687 tlso_session_my_dn( tls_session *sess, struct berval *der_dn )
688 {
689 tlso_session *s = (tlso_session *)sess;
690 X509 *x;
691 X509_NAME *xn;
692
693 x = SSL_get_certificate( s );
694
695 if (!x) return LDAP_INVALID_CREDENTIALS;
696
697 xn = X509_get_subject_name(x);
698 #if OPENSSL_VERSION_NUMBER < 0x10100000
699 der_dn->bv_len = i2d_X509_NAME( xn, NULL );
700 der_dn->bv_val = xn->bytes->data;
701 #else
702 {
703 size_t len = 0;
704 der_dn->bv_val = NULL;
705 X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
706 der_dn->bv_len = len;
707 }
708 #endif
709 /* Don't X509_free, the session is still using it */
710 return 0;
711 }
712
713 static X509 *
tlso_get_cert(SSL * s)714 tlso_get_cert( SSL *s )
715 {
716 /* If peer cert was bad, treat as if no cert was given */
717 if (SSL_get_verify_result(s)) {
718 return NULL;
719 }
720 return SSL_get_peer_certificate(s);
721 }
722
723 static int
tlso_session_peer_dn(tls_session * sess,struct berval * der_dn)724 tlso_session_peer_dn( tls_session *sess, struct berval *der_dn )
725 {
726 tlso_session *s = (tlso_session *)sess;
727 X509 *x = tlso_get_cert( s );
728 X509_NAME *xn;
729
730 if ( !x )
731 return LDAP_INVALID_CREDENTIALS;
732
733 xn = X509_get_subject_name(x);
734 #if OPENSSL_VERSION_NUMBER < 0x10100000
735 der_dn->bv_len = i2d_X509_NAME( xn, NULL );
736 der_dn->bv_val = xn->bytes->data;
737 #else
738 {
739 size_t len = 0;
740 der_dn->bv_val = NULL;
741 X509_NAME_get0_der( xn, (const unsigned char **)&der_dn->bv_val, &len );
742 der_dn->bv_len = len;
743 }
744 #endif
745 X509_free(x);
746 return 0;
747 }
748
749 /* what kind of hostname were we given? */
750 #define IS_DNS 0
751 #define IS_IP4 1
752 #define IS_IP6 2
753
754 static int
tlso_session_chkhost(LDAP * ld,tls_session * sess,const char * name_in)755 tlso_session_chkhost( LDAP *ld, tls_session *sess, const char *name_in )
756 {
757 tlso_session *s = (tlso_session *)sess;
758 int i, ret = LDAP_LOCAL_ERROR;
759 int chkSAN = ld->ld_options.ldo_tls_require_san, gotSAN = 0;
760 X509 *x;
761 const char *name;
762 char *ptr;
763 int ntype = IS_DNS, nlen;
764 #ifdef LDAP_PF_INET6
765 struct in6_addr addr;
766 #else
767 struct in_addr addr;
768 #endif
769
770 if( ldap_int_hostname &&
771 ( !name_in || !strcasecmp( name_in, "localhost" ) ) )
772 {
773 name = ldap_int_hostname;
774 } else {
775 name = name_in;
776 }
777 nlen = strlen(name);
778
779 x = tlso_get_cert(s);
780 if (!x) {
781 Debug0( LDAP_DEBUG_ANY,
782 "TLS: unable to get peer certificate.\n" );
783 /* If this was a fatal condition, things would have
784 * aborted long before now.
785 */
786 return LDAP_SUCCESS;
787 }
788
789 #ifdef LDAP_PF_INET6
790 if (inet_pton(AF_INET6, name, &addr)) {
791 ntype = IS_IP6;
792 } else
793 #endif
794 if ((ptr = strrchr(name, '.')) && isdigit((unsigned char)ptr[1])) {
795 if (inet_aton(name, (struct in_addr *)&addr)) ntype = IS_IP4;
796 }
797
798 if (chkSAN) {
799 i = X509_get_ext_by_NID(x, NID_subject_alt_name, -1);
800 if (i >= 0) {
801 X509_EXTENSION *ex;
802 STACK_OF(GENERAL_NAME) *alt;
803
804 ex = X509_get_ext(x, i);
805 alt = X509V3_EXT_d2i(ex);
806 if (alt) {
807 int n, len2 = 0;
808 char *domain = NULL;
809 GENERAL_NAME *gn;
810
811 gotSAN = 1;
812 if (ntype == IS_DNS) {
813 domain = strchr(name, '.');
814 if (domain) {
815 len2 = nlen - (domain-name);
816 }
817 }
818 n = sk_GENERAL_NAME_num(alt);
819 for (i=0; i<n; i++) {
820 char *sn;
821 int sl;
822 gn = sk_GENERAL_NAME_value(alt, i);
823 if (gn->type == GEN_DNS) {
824 if (ntype != IS_DNS) continue;
825
826 sn = (char *) ASN1_STRING_data(gn->d.ia5);
827 sl = ASN1_STRING_length(gn->d.ia5);
828
829 /* ignore empty */
830 if (sl == 0) continue;
831
832 /* Is this an exact match? */
833 if ((nlen == sl) && !strncasecmp(name, sn, nlen)) {
834 break;
835 }
836
837 /* Is this a wildcard match? */
838 if (domain && (sn[0] == '*') && (sn[1] == '.') &&
839 (len2 == sl-1) && !strncasecmp(domain, &sn[1], len2))
840 {
841 break;
842 }
843
844 } else if (gn->type == GEN_IPADD) {
845 if (ntype == IS_DNS) continue;
846
847 sn = (char *) ASN1_STRING_data(gn->d.ia5);
848 sl = ASN1_STRING_length(gn->d.ia5);
849
850 #ifdef LDAP_PF_INET6
851 if (ntype == IS_IP6 && sl != sizeof(struct in6_addr)) {
852 continue;
853 } else
854 #endif
855 if (ntype == IS_IP4 && sl != sizeof(struct in_addr)) {
856 continue;
857 }
858 if (!memcmp(sn, &addr, sl)) {
859 break;
860 }
861 }
862 }
863
864 GENERAL_NAMES_free(alt);
865 if (i < n) { /* Found a match */
866 ret = LDAP_SUCCESS;
867 }
868 }
869 }
870 }
871 if (ret != LDAP_SUCCESS && chkSAN) {
872 switch(chkSAN) {
873 case LDAP_OPT_X_TLS_DEMAND:
874 case LDAP_OPT_X_TLS_HARD:
875 if (!gotSAN) {
876 Debug0( LDAP_DEBUG_ANY,
877 "TLS: unable to get subjectAltName from peer certificate.\n" );
878 ret = LDAP_CONNECT_ERROR;
879 if ( ld->ld_error ) {
880 LDAP_FREE( ld->ld_error );
881 }
882 ld->ld_error = LDAP_STRDUP(
883 _("TLS: unable to get subjectAltName from peer certificate"));
884 goto done;
885 }
886 /* FALLTHRU */
887 case LDAP_OPT_X_TLS_TRY:
888 if (gotSAN) {
889 Debug1( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
890 "subjectAltName in certificate.\n",
891 name );
892 ret = LDAP_CONNECT_ERROR;
893 if ( ld->ld_error ) {
894 LDAP_FREE( ld->ld_error );
895 }
896 ld->ld_error = LDAP_STRDUP(
897 _("TLS: hostname does not match subjectAltName in peer certificate"));
898 goto done;
899 }
900 break;
901 case LDAP_OPT_X_TLS_ALLOW:
902 break;
903 }
904 }
905
906 if (ret != LDAP_SUCCESS) {
907 X509_NAME *xn;
908 X509_NAME_ENTRY *ne;
909 ASN1_OBJECT *obj;
910 ASN1_STRING *cn = NULL;
911 int navas;
912
913 /* find the last CN */
914 obj = OBJ_nid2obj( NID_commonName );
915 if ( !obj ) goto no_cn; /* should never happen */
916
917 xn = X509_get_subject_name(x);
918 navas = X509_NAME_entry_count( xn );
919 for ( i=navas-1; i>=0; i-- ) {
920 ne = X509_NAME_get_entry( xn, i );
921 if ( !OBJ_cmp( X509_NAME_ENTRY_get_object(ne), obj )) {
922 cn = X509_NAME_ENTRY_get_data( ne );
923 break;
924 }
925 }
926
927 if( !cn )
928 {
929 no_cn:
930 Debug0( LDAP_DEBUG_ANY,
931 "TLS: unable to get common name from peer certificate.\n" );
932 ret = LDAP_CONNECT_ERROR;
933 if ( ld->ld_error ) {
934 LDAP_FREE( ld->ld_error );
935 }
936 ld->ld_error = LDAP_STRDUP(
937 _("TLS: unable to get CN from peer certificate"));
938
939 } else if ( cn->length == nlen &&
940 strncasecmp( name, (char *) cn->data, nlen ) == 0 ) {
941 ret = LDAP_SUCCESS;
942
943 } else if (( cn->data[0] == '*' ) && ( cn->data[1] == '.' )) {
944 char *domain = strchr(name, '.');
945 if( domain ) {
946 int dlen;
947
948 dlen = nlen - (domain-name);
949
950 /* Is this a wildcard match? */
951 if ((dlen == cn->length-1) &&
952 !strncasecmp(domain, (char *) &cn->data[1], dlen)) {
953 ret = LDAP_SUCCESS;
954 }
955 }
956 }
957
958 if( ret == LDAP_LOCAL_ERROR ) {
959 Debug3( LDAP_DEBUG_ANY, "TLS: hostname (%s) does not match "
960 "common name in certificate (%.*s).\n",
961 name, cn->length, cn->data );
962 ret = LDAP_CONNECT_ERROR;
963 if ( ld->ld_error ) {
964 LDAP_FREE( ld->ld_error );
965 }
966 ld->ld_error = LDAP_STRDUP(
967 _("TLS: hostname does not match name in peer certificate"));
968 }
969 }
970 done:
971 X509_free(x);
972 return ret;
973 }
974
975 static int
tlso_session_strength(tls_session * sess)976 tlso_session_strength( tls_session *sess )
977 {
978 tlso_session *s = (tlso_session *)sess;
979
980 return SSL_CIPHER_get_bits(SSL_get_current_cipher(s), NULL);
981 }
982
983 static int
tlso_session_unique(tls_session * sess,struct berval * buf,int is_server)984 tlso_session_unique( tls_session *sess, struct berval *buf, int is_server)
985 {
986 tlso_session *s = (tlso_session *)sess;
987
988 /* Usually the client sends the finished msg. But if the
989 * session was resumed, the server sent the msg.
990 */
991 if (SSL_session_reused(s) ^ !is_server)
992 buf->bv_len = SSL_get_finished(s, buf->bv_val, buf->bv_len);
993 else
994 buf->bv_len = SSL_get_peer_finished(s, buf->bv_val, buf->bv_len);
995 return buf->bv_len;
996 }
997
998 static int
tlso_session_endpoint(tls_session * sess,struct berval * buf,int is_server)999 tlso_session_endpoint( tls_session *sess, struct berval *buf, int is_server )
1000 {
1001 tlso_session *s = (tlso_session *)sess;
1002 const EVP_MD *md;
1003 unsigned int md_len;
1004 X509 *cert;
1005
1006 if ( buf->bv_len < EVP_MAX_MD_SIZE )
1007 return 0;
1008
1009 if ( is_server )
1010 cert = SSL_get_certificate( s );
1011 else
1012 cert = SSL_get_peer_certificate( s );
1013
1014 if ( cert == NULL )
1015 return 0;
1016
1017 #if OPENSSL_VERSION_NUMBER >= 0x10100000
1018 md = EVP_get_digestbynid( X509_get_signature_nid( cert ));
1019 #else
1020 md = EVP_get_digestbynid(OBJ_obj2nid( cert->sig_alg->algorithm ));
1021 #endif
1022
1023 /* See RFC 5929 */
1024 if ( md == NULL ||
1025 md == EVP_md_null() ||
1026 #ifndef OPENSSL_NO_MD2
1027 md == EVP_md2() ||
1028 #endif
1029 md == EVP_md4() ||
1030 md == EVP_md5() ||
1031 md == EVP_sha1() )
1032 md = EVP_sha256();
1033
1034 if ( !X509_digest( cert, md, (unsigned char *) (buf->bv_val), &md_len ))
1035 md_len = 0;
1036
1037 buf->bv_len = md_len;
1038 if ( !is_server )
1039 X509_free( cert );
1040
1041 return md_len;
1042 }
1043
1044 static const char *
tlso_session_version(tls_session * sess)1045 tlso_session_version( tls_session *sess )
1046 {
1047 tlso_session *s = (tlso_session *)sess;
1048 return SSL_get_version(s);
1049 }
1050
1051 static const char *
tlso_session_cipher(tls_session * sess)1052 tlso_session_cipher( tls_session *sess )
1053 {
1054 tlso_session *s = (tlso_session *)sess;
1055 return SSL_CIPHER_get_name(SSL_get_current_cipher(s));
1056 }
1057
1058 static int
tlso_session_peercert(tls_session * sess,struct berval * der)1059 tlso_session_peercert( tls_session *sess, struct berval *der )
1060 {
1061 tlso_session *s = (tlso_session *)sess;
1062 int ret = -1;
1063 X509 *x = SSL_get_peer_certificate(s);
1064 if ( x ) {
1065 der->bv_len = i2d_X509(x, NULL);
1066 der->bv_val = LDAP_MALLOC(der->bv_len);
1067 if ( der->bv_val ) {
1068 unsigned char *ptr = (unsigned char *) (der->bv_val);
1069 i2d_X509(x, &ptr);
1070 ret = 0;
1071 }
1072 X509_free( x );
1073 }
1074 return ret;
1075 }
1076
1077 static int
tlso_session_pinning(LDAP * ld,tls_session * sess,char * hashalg,struct berval * hash)1078 tlso_session_pinning( LDAP *ld, tls_session *sess, char *hashalg, struct berval *hash )
1079 {
1080 tlso_session *s = (tlso_session *)sess;
1081 unsigned char *tmp, digest[EVP_MAX_MD_SIZE];
1082 struct berval key,
1083 keyhash = { sizeof(digest), (char *) digest };
1084 X509 *cert = SSL_get_peer_certificate(s);
1085 int len, rc = LDAP_SUCCESS;
1086
1087 if ( !cert )
1088 return -1;
1089
1090 len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), NULL );
1091
1092 tmp = LDAP_MALLOC( len );
1093 key.bv_val = (char *) tmp;
1094
1095 if ( !key.bv_val ) {
1096 rc = -1;
1097 goto done;
1098 }
1099
1100 key.bv_len = i2d_X509_PUBKEY( X509_get_X509_PUBKEY(cert), &tmp );
1101
1102 if ( hashalg ) {
1103 const EVP_MD *md;
1104 EVP_MD_CTX *mdctx;
1105 unsigned int len = keyhash.bv_len;
1106
1107 md = EVP_get_digestbyname( hashalg );
1108 if ( !md ) {
1109 Debug1( LDAP_DEBUG_TRACE, "tlso_session_pinning: "
1110 "hash %s not recognised by OpenSSL\n", hashalg );
1111 rc = -1;
1112 goto done;
1113 }
1114
1115 #if OPENSSL_VERSION_NUMBER >= 0x10100000
1116 mdctx = EVP_MD_CTX_new();
1117 #else
1118 mdctx = EVP_MD_CTX_create();
1119 #endif
1120 if ( !mdctx ) {
1121 rc = -1;
1122 goto done;
1123 }
1124
1125 EVP_DigestInit_ex( mdctx, md, NULL );
1126 EVP_DigestUpdate( mdctx, key.bv_val, key.bv_len );
1127 EVP_DigestFinal_ex( mdctx, (unsigned char *)keyhash.bv_val, &len );
1128 keyhash.bv_len = len;
1129 #if OPENSSL_VERSION_NUMBER >= 0x10100000
1130 EVP_MD_CTX_free( mdctx );
1131 #else
1132 EVP_MD_CTX_destroy( mdctx );
1133 #endif
1134 } else {
1135 keyhash = key;
1136 }
1137
1138 if ( ber_bvcmp( hash, &keyhash ) ) {
1139 rc = LDAP_CONNECT_ERROR;
1140 Debug0( LDAP_DEBUG_ANY, "tlso_session_pinning: "
1141 "public key hash does not match provided pin.\n" );
1142 if ( ld->ld_error ) {
1143 LDAP_FREE( ld->ld_error );
1144 }
1145 ld->ld_error = LDAP_STRDUP(
1146 _("TLS: public key hash does not match provided pin"));
1147 }
1148
1149 done:
1150 LDAP_FREE( key.bv_val );
1151 X509_free( cert );
1152 return rc;
1153 }
1154
1155 /*
1156 * TLS support for LBER Sockbufs
1157 */
1158
1159 struct tls_data {
1160 tlso_session *session;
1161 Sockbuf_IO_Desc *sbiod;
1162 };
1163
1164 #if OPENSSL_VERSION_NUMBER < 0x10100000
1165 #define BIO_set_init(b, x) b->init = x
1166 #define BIO_set_data(b, x) b->ptr = x
1167 #define BIO_clear_flags(b, x) b->flags &= ~(x)
1168 #define BIO_get_data(b) b->ptr
1169 #endif
1170 static int
tlso_bio_create(BIO * b)1171 tlso_bio_create( BIO *b ) {
1172 BIO_set_init( b, 1 );
1173 BIO_set_data( b, NULL );
1174 BIO_clear_flags( b, ~0 );
1175 return 1;
1176 }
1177
1178 static int
tlso_bio_destroy(BIO * b)1179 tlso_bio_destroy( BIO *b )
1180 {
1181 if ( b == NULL ) return 0;
1182
1183 BIO_set_data( b, NULL ); /* sb_tls_remove() will free it */
1184 BIO_set_init( b, 0 );
1185 BIO_clear_flags( b, ~0 );
1186 return 1;
1187 }
1188
1189 static int
tlso_bio_read(BIO * b,char * buf,int len)1190 tlso_bio_read( BIO *b, char *buf, int len )
1191 {
1192 struct tls_data *p;
1193 int ret;
1194
1195 if ( buf == NULL || len <= 0 ) return 0;
1196
1197 p = (struct tls_data *)BIO_get_data(b);
1198
1199 if ( p == NULL || p->sbiod == NULL ) {
1200 return 0;
1201 }
1202
1203 ret = LBER_SBIOD_READ_NEXT( p->sbiod, buf, len );
1204
1205 BIO_clear_retry_flags( b );
1206 if ( ret < 0 ) {
1207 int err = sock_errno();
1208 if ( err == EAGAIN || err == EWOULDBLOCK ) {
1209 BIO_set_retry_read( b );
1210 }
1211 }
1212
1213 return ret;
1214 }
1215
1216 static int
tlso_bio_write(BIO * b,const char * buf,int len)1217 tlso_bio_write( BIO *b, const char *buf, int len )
1218 {
1219 struct tls_data *p;
1220 int ret;
1221
1222 if ( buf == NULL || len <= 0 ) return 0;
1223
1224 p = (struct tls_data *)BIO_get_data(b);
1225
1226 if ( p == NULL || p->sbiod == NULL ) {
1227 return 0;
1228 }
1229
1230 ret = LBER_SBIOD_WRITE_NEXT( p->sbiod, (char *)buf, len );
1231
1232 BIO_clear_retry_flags( b );
1233 if ( ret < 0 ) {
1234 int err = sock_errno();
1235 if ( err == EAGAIN || err == EWOULDBLOCK ) {
1236 BIO_set_retry_write( b );
1237 }
1238 }
1239
1240 return ret;
1241 }
1242
1243 static long
tlso_bio_ctrl(BIO * b,int cmd,long num,void * ptr)1244 tlso_bio_ctrl( BIO *b, int cmd, long num, void *ptr )
1245 {
1246 if ( cmd == BIO_CTRL_FLUSH ) {
1247 /* The OpenSSL library needs this */
1248 return 1;
1249 }
1250 return 0;
1251 }
1252
1253 static int
tlso_bio_gets(BIO * b,char * buf,int len)1254 tlso_bio_gets( BIO *b, char *buf, int len )
1255 {
1256 return -1;
1257 }
1258
1259 static int
tlso_bio_puts(BIO * b,const char * str)1260 tlso_bio_puts( BIO *b, const char *str )
1261 {
1262 return tlso_bio_write( b, str, strlen( str ) );
1263 }
1264
1265 static BIO_METHOD *
tlso_bio_setup(void)1266 tlso_bio_setup( void )
1267 {
1268 /* it's a source/sink BIO */
1269 BIO_METHOD * method = BIO_meth_new( 100 | 0x400, "sockbuf glue" );
1270 BIO_meth_set_write( method, tlso_bio_write );
1271 BIO_meth_set_read( method, tlso_bio_read );
1272 BIO_meth_set_puts( method, tlso_bio_puts );
1273 BIO_meth_set_gets( method, tlso_bio_gets );
1274 BIO_meth_set_ctrl( method, tlso_bio_ctrl );
1275 BIO_meth_set_create( method, tlso_bio_create );
1276 BIO_meth_set_destroy( method, tlso_bio_destroy );
1277
1278 return method;
1279 }
1280
1281 static int
tlso_sb_setup(Sockbuf_IO_Desc * sbiod,void * arg)1282 tlso_sb_setup( Sockbuf_IO_Desc *sbiod, void *arg )
1283 {
1284 struct tls_data *p;
1285 BIO *bio;
1286
1287 assert( sbiod != NULL );
1288
1289 p = LBER_MALLOC( sizeof( *p ) );
1290 if ( p == NULL ) {
1291 return -1;
1292 }
1293
1294 p->session = arg;
1295 p->sbiod = sbiod;
1296 bio = BIO_new( tlso_bio_method );
1297 BIO_set_data( bio, p );
1298 SSL_set_bio( p->session, bio, bio );
1299 sbiod->sbiod_pvt = p;
1300 return 0;
1301 }
1302
1303 static int
tlso_sb_remove(Sockbuf_IO_Desc * sbiod)1304 tlso_sb_remove( Sockbuf_IO_Desc *sbiod )
1305 {
1306 struct tls_data *p;
1307
1308 assert( sbiod != NULL );
1309 assert( sbiod->sbiod_pvt != NULL );
1310
1311 p = (struct tls_data *)sbiod->sbiod_pvt;
1312 SSL_free( p->session );
1313 LBER_FREE( sbiod->sbiod_pvt );
1314 sbiod->sbiod_pvt = NULL;
1315 return 0;
1316 }
1317
1318 static int
tlso_sb_close(Sockbuf_IO_Desc * sbiod)1319 tlso_sb_close( Sockbuf_IO_Desc *sbiod )
1320 {
1321 struct tls_data *p;
1322
1323 assert( sbiod != NULL );
1324 assert( sbiod->sbiod_pvt != NULL );
1325
1326 p = (struct tls_data *)sbiod->sbiod_pvt;
1327 SSL_shutdown( p->session );
1328 return 0;
1329 }
1330
1331 static int
tlso_sb_ctrl(Sockbuf_IO_Desc * sbiod,int opt,void * arg)1332 tlso_sb_ctrl( Sockbuf_IO_Desc *sbiod, int opt, void *arg )
1333 {
1334 struct tls_data *p;
1335
1336 assert( sbiod != NULL );
1337 assert( sbiod->sbiod_pvt != NULL );
1338
1339 p = (struct tls_data *)sbiod->sbiod_pvt;
1340
1341 if ( opt == LBER_SB_OPT_GET_SSL ) {
1342 *((tlso_session **)arg) = p->session;
1343 return 1;
1344
1345 } else if ( opt == LBER_SB_OPT_DATA_READY ) {
1346 if( SSL_pending( p->session ) > 0 ) {
1347 return 1;
1348 }
1349 }
1350
1351 return LBER_SBIOD_CTRL_NEXT( sbiod, opt, arg );
1352 }
1353
1354 static ber_slen_t
tlso_sb_read(Sockbuf_IO_Desc * sbiod,void * buf,ber_len_t len)1355 tlso_sb_read( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
1356 {
1357 struct tls_data *p;
1358 ber_slen_t ret;
1359 int err;
1360
1361 assert( sbiod != NULL );
1362 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
1363
1364 p = (struct tls_data *)sbiod->sbiod_pvt;
1365
1366 ret = SSL_read( p->session, (char *)buf, len );
1367 #ifdef HAVE_WINSOCK
1368 errno = WSAGetLastError();
1369 #endif
1370 err = SSL_get_error( p->session, ret );
1371 if (err == SSL_ERROR_WANT_READ ) {
1372 sbiod->sbiod_sb->sb_trans_needs_read = 1;
1373 sock_errset(EWOULDBLOCK);
1374 }
1375 else
1376 sbiod->sbiod_sb->sb_trans_needs_read = 0;
1377 return ret;
1378 }
1379
1380 static ber_slen_t
tlso_sb_write(Sockbuf_IO_Desc * sbiod,void * buf,ber_len_t len)1381 tlso_sb_write( Sockbuf_IO_Desc *sbiod, void *buf, ber_len_t len)
1382 {
1383 struct tls_data *p;
1384 ber_slen_t ret;
1385 int err;
1386
1387 assert( sbiod != NULL );
1388 assert( SOCKBUF_VALID( sbiod->sbiod_sb ) );
1389
1390 p = (struct tls_data *)sbiod->sbiod_pvt;
1391
1392 ret = SSL_write( p->session, (char *)buf, len );
1393 #ifdef HAVE_WINSOCK
1394 errno = WSAGetLastError();
1395 #endif
1396 err = SSL_get_error( p->session, ret );
1397 if (err == SSL_ERROR_WANT_WRITE ) {
1398 sbiod->sbiod_sb->sb_trans_needs_write = 1;
1399 sock_errset(EWOULDBLOCK);
1400
1401 } else {
1402 sbiod->sbiod_sb->sb_trans_needs_write = 0;
1403 }
1404 return ret;
1405 }
1406
1407 static Sockbuf_IO tlso_sbio =
1408 {
1409 tlso_sb_setup, /* sbi_setup */
1410 tlso_sb_remove, /* sbi_remove */
1411 tlso_sb_ctrl, /* sbi_ctrl */
1412 tlso_sb_read, /* sbi_read */
1413 tlso_sb_write, /* sbi_write */
1414 tlso_sb_close /* sbi_close */
1415 };
1416
1417 /* Derived from openssl/apps/s_cb.c */
1418 static void
tlso_info_cb(const SSL * ssl,int where,int ret)1419 tlso_info_cb( const SSL *ssl, int where, int ret )
1420 {
1421 int w;
1422 char *op;
1423 char *state = (char *) SSL_state_string_long( (SSL *)ssl );
1424
1425 w = where & ~SSL_ST_MASK;
1426 if ( w & SSL_ST_CONNECT ) {
1427 op = "SSL_connect";
1428 } else if ( w & SSL_ST_ACCEPT ) {
1429 op = "SSL_accept";
1430 } else {
1431 op = "undefined";
1432 }
1433
1434 #ifdef HAVE_EBCDIC
1435 if ( state ) {
1436 state = LDAP_STRDUP( state );
1437 __etoa( state );
1438 }
1439 #endif
1440 if ( where & SSL_CB_LOOP ) {
1441 Debug2( LDAP_DEBUG_TRACE,
1442 "TLS trace: %s:%s\n",
1443 op, state );
1444
1445 } else if ( where & SSL_CB_ALERT ) {
1446 char *atype = (char *) SSL_alert_type_string_long( ret );
1447 char *adesc = (char *) SSL_alert_desc_string_long( ret );
1448 op = ( where & SSL_CB_READ ) ? "read" : "write";
1449 #ifdef HAVE_EBCDIC
1450 if ( atype ) {
1451 atype = LDAP_STRDUP( atype );
1452 __etoa( atype );
1453 }
1454 if ( adesc ) {
1455 adesc = LDAP_STRDUP( adesc );
1456 __etoa( adesc );
1457 }
1458 #endif
1459 Debug3( LDAP_DEBUG_TRACE,
1460 "TLS trace: SSL3 alert %s:%s:%s\n",
1461 op, atype, adesc );
1462 #ifdef HAVE_EBCDIC
1463 if ( atype ) LDAP_FREE( atype );
1464 if ( adesc ) LDAP_FREE( adesc );
1465 #endif
1466 } else if ( where & SSL_CB_EXIT ) {
1467 if ( ret == 0 ) {
1468 Debug2( LDAP_DEBUG_TRACE,
1469 "TLS trace: %s:failed in %s\n",
1470 op, state );
1471 } else if ( ret < 0 ) {
1472 Debug2( LDAP_DEBUG_TRACE,
1473 "TLS trace: %s:error in %s\n",
1474 op, state );
1475 }
1476 }
1477 #ifdef HAVE_EBCDIC
1478 if ( state ) LDAP_FREE( state );
1479 #endif
1480 }
1481
1482 static int
tlso_verify_cb(int ok,X509_STORE_CTX * ctx)1483 tlso_verify_cb( int ok, X509_STORE_CTX *ctx )
1484 {
1485 X509 *cert;
1486 int errnum;
1487 int errdepth;
1488 X509_NAME *subject;
1489 X509_NAME *issuer;
1490 char *sname;
1491 char *iname;
1492 char *certerr = NULL;
1493
1494 cert = X509_STORE_CTX_get_current_cert( ctx );
1495 errnum = X509_STORE_CTX_get_error( ctx );
1496 errdepth = X509_STORE_CTX_get_error_depth( ctx );
1497
1498 /*
1499 * X509_get_*_name return pointers to the internal copies of
1500 * those things requested. So do not free them.
1501 */
1502 subject = X509_get_subject_name( cert );
1503 issuer = X509_get_issuer_name( cert );
1504 /* X509_NAME_oneline, if passed a NULL buf, allocate memory */
1505 sname = X509_NAME_oneline( subject, NULL, 0 );
1506 iname = X509_NAME_oneline( issuer, NULL, 0 );
1507 if ( !ok ) certerr = (char *)X509_verify_cert_error_string( errnum );
1508 #ifdef HAVE_EBCDIC
1509 if ( sname ) __etoa( sname );
1510 if ( iname ) __etoa( iname );
1511 if ( certerr ) {
1512 certerr = LDAP_STRDUP( certerr );
1513 __etoa( certerr );
1514 }
1515 #endif
1516 Debug3( LDAP_DEBUG_TRACE,
1517 "TLS certificate verification: depth: %d, err: %d, subject: %s,",
1518 errdepth, errnum,
1519 sname ? sname : "-unknown-" );
1520 Debug1( LDAP_DEBUG_TRACE, " issuer: %s\n", iname ? iname : "-unknown-" );
1521 if ( !ok ) {
1522 Debug1( LDAP_DEBUG_ANY,
1523 "TLS certificate verification: Error, %s\n",
1524 certerr );
1525 }
1526 if ( sname )
1527 OPENSSL_free ( sname );
1528 if ( iname )
1529 OPENSSL_free ( iname );
1530 #ifdef HAVE_EBCDIC
1531 if ( certerr ) LDAP_FREE( certerr );
1532 #endif
1533 return ok;
1534 }
1535
1536 static int
tlso_verify_ok(int ok,X509_STORE_CTX * ctx)1537 tlso_verify_ok( int ok, X509_STORE_CTX *ctx )
1538 {
1539 (void) tlso_verify_cb( ok, ctx );
1540 return 1;
1541 }
1542
1543 /* Inspired by ERR_print_errors in OpenSSL */
1544 static void
tlso_report_error(void)1545 tlso_report_error( void )
1546 {
1547 unsigned long l;
1548 char buf[200];
1549 const char *file;
1550 int line;
1551
1552 while ( ( l = ERR_get_error_line( &file, &line ) ) != 0 ) {
1553 ERR_error_string_n( l, buf, sizeof( buf ) );
1554 #ifdef HAVE_EBCDIC
1555 if ( file ) {
1556 file = LDAP_STRDUP( file );
1557 __etoa( (char *)file );
1558 }
1559 __etoa( buf );
1560 #endif
1561 Debug3( LDAP_DEBUG_ANY, "TLS: %s %s:%d\n",
1562 buf, file, line );
1563 #ifdef HAVE_EBCDIC
1564 if ( file ) LDAP_FREE( (void *)file );
1565 #endif
1566 }
1567 }
1568
1569 #if OPENSSL_VERSION_NUMBER < 0x10100000
1570 static RSA *
tlso_tmp_rsa_cb(SSL * ssl,int is_export,int key_length)1571 tlso_tmp_rsa_cb( SSL *ssl, int is_export, int key_length )
1572 {
1573 RSA *tmp_rsa;
1574 /* FIXME: Pregenerate the key on startup */
1575 /* FIXME: Who frees the key? */
1576 BIGNUM *bn = BN_new();
1577 tmp_rsa = NULL;
1578 if ( bn ) {
1579 if ( BN_set_word( bn, RSA_F4 )) {
1580 tmp_rsa = RSA_new();
1581 if ( tmp_rsa && !RSA_generate_key_ex( tmp_rsa, key_length, bn, NULL )) {
1582 RSA_free( tmp_rsa );
1583 tmp_rsa = NULL;
1584 }
1585 }
1586 BN_free( bn );
1587 }
1588
1589 if ( !tmp_rsa ) {
1590 Debug2( LDAP_DEBUG_ANY,
1591 "TLS: Failed to generate temporary %d-bit %s RSA key\n",
1592 key_length, is_export ? "export" : "domestic" );
1593 }
1594 return tmp_rsa;
1595 }
1596 #endif /* OPENSSL_VERSION_NUMBER < 1.1 */
1597
1598 static int
tlso_seed_PRNG(const char * randfile)1599 tlso_seed_PRNG( const char *randfile )
1600 {
1601 #ifndef URANDOM_DEVICE
1602 /* no /dev/urandom (or equiv) */
1603 long total=0;
1604 char buffer[MAXPATHLEN];
1605
1606 if (randfile == NULL) {
1607 /* The seed file is $RANDFILE if defined, otherwise $HOME/.rnd.
1608 * If $HOME is not set or buffer too small to hold the pathname,
1609 * an error occurs. - From RAND_file_name() man page.
1610 * The fact is that when $HOME is NULL, .rnd is used.
1611 */
1612 randfile = RAND_file_name( buffer, sizeof( buffer ) );
1613 }
1614 #ifndef OPENSSL_NO_EGD
1615 else if (RAND_egd(randfile) > 0) {
1616 /* EGD socket */
1617 return 0;
1618 }
1619 #endif
1620
1621 if (randfile == NULL) {
1622 Debug0( LDAP_DEBUG_ANY,
1623 "TLS: Use configuration file or $RANDFILE to define seed PRNG\n" );
1624 return -1;
1625 }
1626
1627 total = RAND_load_file(randfile, -1);
1628
1629 if (RAND_status() == 0) {
1630 Debug0( LDAP_DEBUG_ANY,
1631 "TLS: PRNG not been seeded with enough data\n" );
1632 return -1;
1633 }
1634
1635 /* assume if there was enough bits to seed that it's okay
1636 * to write derived bits to the file
1637 */
1638 RAND_write_file(randfile);
1639
1640 #endif
1641
1642 return 0;
1643 }
1644
1645
1646 tls_impl ldap_int_tls_impl = {
1647 "OpenSSL",
1648
1649 tlso_init,
1650 tlso_destroy,
1651
1652 tlso_ctx_new,
1653 tlso_ctx_ref,
1654 tlso_ctx_free,
1655 tlso_ctx_init,
1656
1657 tlso_session_new,
1658 tlso_session_connect,
1659 tlso_session_accept,
1660 tlso_session_upflags,
1661 tlso_session_errmsg,
1662 tlso_session_my_dn,
1663 tlso_session_peer_dn,
1664 tlso_session_chkhost,
1665 tlso_session_strength,
1666 tlso_session_unique,
1667 tlso_session_endpoint,
1668 tlso_session_version,
1669 tlso_session_cipher,
1670 tlso_session_peercert,
1671 tlso_session_pinning,
1672
1673 &tlso_sbio,
1674
1675 #ifdef LDAP_R_COMPILE
1676 tlso_thr_init,
1677 #else
1678 NULL,
1679 #endif
1680
1681 0
1682 };
1683
1684 #endif /* HAVE_OPENSSL */
1685