1 /* * eap-tls.c - EAP-TLS implementation for PPP
3 * Copyright (c) Beniamino Galvani 2005 All rights reserved.
4 * Jan Just Keijser 2006-2019 All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
18 * 3. The name(s) of the authors of this software must not be used to
19 * endorse or promote products derived from this software without
20 * prior written permission.
22 * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
23 * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
24 * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
25 * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
26 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
27 * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
28 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
35 #include <sys/types.h>
39 #include <openssl/conf.h>
40 #include <openssl/engine.h>
41 #include <openssl/hmac.h>
42 #include <openssl/err.h>
43 #include <openssl/ui.h>
44 #include <openssl/x509v3.h>
53 #include "pathnames.h"
55 typedef struct pw_cb_data
58 const char *prompt_info;
61 #ifndef OPENSSL_NO_ENGINE
62 /* The openssl configuration file and engines can be loaded only once */
63 static CONF *ssl_config = NULL;
64 static ENGINE *cert_engine = NULL;
65 static ENGINE *pkey_engine = NULL;
68 /* TLSv1.3 do we have a session ticket ? */
69 static int have_session_ticket = 0;
71 int ssl_verify_callback(int, X509_STORE_CTX *);
72 void ssl_msg_callback(int write_p, int version, int ct, const void *buf,
73 size_t len, SSL * ssl, void *arg);
74 int ssl_new_session_cb(SSL *s, SSL_SESSION *sess);
76 X509 *get_X509_from_file(char *filename);
77 int ssl_cmp_certs(char *filename, X509 * a);
80 * OpenSSL 1.1+ introduced a generic TLS_method()
81 * For older releases we substitute the appropriate method
84 #if OPENSSL_VERSION_NUMBER < 0x10100000L
86 #define TLS_method SSLv23_method
88 #define SSL3_RT_HEADER 0x100
90 #ifndef SSL_CTX_set_max_proto_version
91 /** Mimics SSL_CTX_set_max_proto_version for OpenSSL < 1.1 */
92 static inline int SSL_CTX_set_max_proto_version(SSL_CTX *ctx, long tls_ver_max)
96 if (tls_ver_max < TLS1_VERSION)
98 sslopt |= SSL_OP_NO_TLSv1;
100 #ifdef SSL_OP_NO_TLSv1_1
101 if (tls_ver_max < TLS1_1_VERSION)
103 sslopt |= SSL_OP_NO_TLSv1_1;
106 #ifdef SSL_OP_NO_TLSv1_2
107 if (tls_ver_max < TLS1_2_VERSION)
109 sslopt |= SSL_OP_NO_TLSv1_2;
112 SSL_CTX_set_options(ctx, sslopt);
116 #endif /* SSL_CTX_set_max_proto_version */
118 #endif /* OPENSSL_VERSION_NUMBER < 0x10100000L */
121 #define EAPTLS_MPPE_KEY_LEN 32
124 * Generate keys according to RFC 2716 and add to reply
126 void eaptls_gen_mppe_keys(struct eaptls_session *ets, int client)
128 unsigned char out[4*EAPTLS_MPPE_KEY_LEN];
129 const char *prf_label;
131 unsigned char eap_tls13_context[] = { EAPT_TLS };
132 unsigned char *context = NULL;
133 size_t context_len = 0;
136 dbglog("EAP-TLS generating MPPE keys");
139 prf_label = "EXPORTER_EAP_TLS_Key_Material";
140 context = eap_tls13_context;
145 prf_label = "client EAP encryption";
148 dbglog("EAP-TLS PRF label = %s", prf_label);
149 prf_size = strlen(prf_label);
150 if (SSL_export_keying_material(ets->ssl, out, sizeof(out), prf_label, prf_size,
151 context, context_len, 0) != 1)
153 warn( "EAP-TLS: Failed generating keying material" );
158 * We now have the master send and receive keys.
159 * From these, generate the session send and receive keys.
160 * (see RFC3079 / draft-ietf-pppext-mppe-keys-03.txt for details)
164 mppe_set_keys(out, out + EAPTLS_MPPE_KEY_LEN, EAPTLS_MPPE_KEY_LEN);
168 mppe_set_keys(out + EAPTLS_MPPE_KEY_LEN, out, EAPTLS_MPPE_KEY_LEN);
175 void log_ssl_errors( void )
177 unsigned long ssl_err = ERR_get_error();
180 dbglog("EAP-TLS SSL error stack:");
181 while (ssl_err != 0) {
182 dbglog( ERR_error_string( ssl_err, NULL ) );
183 ssl_err = ERR_get_error();
188 int password_callback (char *buf, int size, int rwflag, void *u)
192 strlcpy (buf, passwd, size);
199 CONF *eaptls_ssl_load_config( void )
203 long error_line = 33;
205 config = NCONF_new( NULL );
206 dbglog( "Loading OpenSSL config file" );
207 ret_code = NCONF_load( config, _PATH_OPENSSLCONFFILE, &error_line );
210 warn( "EAP-TLS: Error in OpenSSL config file %s at line %d", _PATH_OPENSSLCONFFILE, error_line );
211 NCONF_free( config );
216 dbglog( "Loading OpenSSL built-ins" );
217 #ifndef OPENSSL_NO_ENGINE
218 ENGINE_load_builtin_engines();
220 OPENSSL_load_builtin_modules();
222 dbglog( "Loading OpenSSL configured modules" );
223 if (CONF_modules_load( config, NULL, 0 ) <= 0 )
225 warn( "EAP-TLS: Error loading OpenSSL modules" );
233 #ifndef OPENSSL_NO_ENGINE
234 ENGINE *eaptls_ssl_load_engine( char *engine_name )
238 dbglog( "Enabling OpenSSL auto engines" );
239 ENGINE_register_all_complete();
241 dbglog( "Loading OpenSSL '%s' engine support", engine_name );
242 e = ENGINE_by_id( engine_name );
245 dbglog( "EAP-TLS: Cannot load '%s' engine support, trying 'dynamic'", engine_name );
246 e = ENGINE_by_id( "dynamic" );
249 if (!ENGINE_ctrl_cmd_string(e, "SO_PATH", engine_name, 0)
250 || !ENGINE_ctrl_cmd_string(e, "LOAD", NULL, 0))
252 warn( "EAP-TLS: Error loading dynamic engine '%s'", engine_name );
260 warn( "EAP-TLS: Cannot load dynamic engine support" );
266 dbglog( "Initialising engine" );
267 if(!ENGINE_set_default(e, ENGINE_METHOD_ALL))
269 warn( "EAP-TLS: Cannot use that engine" );
282 * Initialize the SSL stacks and tests if certificates, key and crl
283 * for client or server use can be loaded.
285 SSL_CTX *eaptls_init_ssl(int init_server, char *cacertfile, char *capath,
286 char *certfile, char *peer_certfile, char *privkeyfile)
288 #ifndef OPENSSL_NO_ENGINE
289 char *cert_engine_name = NULL;
290 char *cert_identifier = NULL;
291 char *pkey_engine_name = NULL;
292 char *pkey_identifier = NULL;
296 X509_STORE *certstore;
300 #if defined(TLS1_2_VERSION)
301 long tls_version = TLS1_2_VERSION;
302 #elif defined(TLS1_1_VERSION)
303 long tls_version = TLS1_1_VERSION;
305 long tls_version = TLS1_VERSION;
309 * Without these can't continue
311 if (!(cacertfile[0] || capath[0]))
313 error("EAP-TLS: CA certificate file or path missing");
319 error("EAP-TLS: Certificate missing");
325 error("EAP-TLS: Private key missing");
330 SSL_load_error_strings();
332 #ifndef OPENSSL_NO_ENGINE
333 /* load the openssl config file only once and load it before triggering
334 the loading of a global openssl config file via SSL_CTX_new()
337 ssl_config = eaptls_ssl_load_config();
340 ctx = SSL_CTX_new(TLS_method());
343 error("EAP-TLS: Cannot initialize SSL CTX context");
347 #ifndef OPENSSL_NO_ENGINE
348 /* if the certificate filename is of the form engine:id. e.g.
350 then we try to load and use this engine.
351 If the certificate filename starts with a / or . then we
352 ALWAYS assume it is a file and not an engine/pkcs11 identifier
354 if ( index( certfile, '/' ) == NULL && index( certfile, '.') == NULL )
356 cert_identifier = index( certfile, ':' );
360 cert_engine_name = certfile;
361 *cert_identifier = '\0';
364 dbglog( "Found certificate engine '%s'", cert_engine_name );
365 dbglog( "Found certificate identifier '%s'", cert_identifier );
369 /* if the privatekey filename is of the form engine:id. e.g.
371 then we try to load and use this engine.
372 If the privatekey filename starts with a / or . then we
373 ALWAYS assume it is a file and not an engine/pkcs11 identifier
375 if ( index( privkeyfile, '/' ) == NULL && index( privkeyfile, '.') == NULL )
377 pkey_identifier = index( privkeyfile, ':' );
381 pkey_engine_name = privkeyfile;
382 *pkey_identifier = '\0';
385 dbglog( "Found privatekey engine '%s'", pkey_engine_name );
386 dbglog( "Found privatekey identifier '%s'", pkey_identifier );
390 if (cert_identifier && pkey_identifier)
392 if (strlen( cert_identifier ) == 0)
394 if (strlen( pkey_identifier ) == 0)
395 error( "EAP-TLS: both the certificate and privatekey identifiers are missing!" );
398 dbglog( "Substituting privatekey identifier for certificate identifier" );
399 cert_identifier = pkey_identifier;
404 if (strlen( pkey_identifier ) == 0)
406 dbglog( "Substituting certificate identifier for privatekey identifier" );
407 pkey_identifier = cert_identifier;
412 if (ssl_config && cert_engine_name)
413 cert_engine = eaptls_ssl_load_engine( cert_engine_name );
415 if (ssl_config && pkey_engine_name)
417 /* don't load the same engine twice */
418 if ( cert_engine && strcmp( cert_engine_name, pkey_engine_name) == 0 )
419 pkey_engine = cert_engine;
421 pkey_engine = eaptls_ssl_load_engine( pkey_engine_name );
425 SSL_CTX_set_default_passwd_cb (ctx, password_callback);
427 if (strlen(cacertfile) == 0) cacertfile = NULL;
428 if (strlen(capath) == 0) capath = NULL;
430 if (!SSL_CTX_load_verify_locations(ctx, cacertfile, capath))
432 error("EAP-TLS: Cannot load verify locations");
433 if (cacertfile) dbglog("CA certificate file = [%s]", cacertfile);
434 if (capath) dbglog("CA certificate path = [%s]", capath);
439 SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(cacertfile));
441 #ifndef OPENSSL_NO_ENGINE
446 const char *s_slot_cert_id;
450 cert_info.s_slot_cert_id = cert_identifier;
451 cert_info.cert = NULL;
453 if (!ENGINE_ctrl_cmd( cert_engine, "LOAD_CERT_CTRL", 0, &cert_info, NULL, 0 ) )
455 error( "EAP-TLS: Error loading certificate with id '%s' from engine", cert_identifier );
461 dbglog( "Got the certificate, adding it to SSL context" );
462 dbglog( "subject = %s", X509_NAME_oneline( X509_get_subject_name( cert_info.cert ), NULL, 0 ) );
463 if (SSL_CTX_use_certificate(ctx, cert_info.cert) <= 0)
465 error("EAP-TLS: Cannot use PKCS11 certificate %s", cert_identifier);
471 warn("EAP-TLS: Cannot load PKCS11 key %s", cert_identifier);
478 if (!SSL_CTX_use_certificate_chain_file(ctx, certfile))
480 error( "EAP-TLS: Cannot use public certificate %s", certfile );
487 * Check the Before and After dates of the certificate
490 tmp = SSL_get_certificate(ssl);
492 ret = X509_cmp_time(X509_get_notBefore(tmp), NULL);
495 warn( "EAP-TLS: Failed to read certificate notBefore field.");
499 warn( "EAP-TLS: Your certificate is not yet valid!");
502 ret = X509_cmp_time(X509_get_notAfter(tmp), NULL);
505 warn( "EAP-TLS: Failed to read certificate notAfter field.");
509 warn( "EAP-TLS: Your certificate has expired!");
513 #ifndef OPENSSL_NO_ENGINE
516 EVP_PKEY *pkey = NULL;
519 cb_data.password = passwd;
520 cb_data.prompt_info = pkey_identifier;
524 UI_METHOD* transfer_pin = UI_create_method("transfer_pin");
526 int writer (UI *ui, UI_STRING *uis)
528 PW_CB_DATA* cb_data = (PW_CB_DATA*)UI_get0_user_data(ui);
529 UI_set_result(ui, uis, cb_data->password);
532 int stub (UI* ui) {return 1;};
533 int stub_reader (UI *ui, UI_STRING *uis) {return 1;};
535 UI_method_set_writer(transfer_pin, writer);
536 UI_method_set_opener(transfer_pin, stub);
537 UI_method_set_closer(transfer_pin, stub);
538 UI_method_set_flusher(transfer_pin, stub);
539 UI_method_set_reader(transfer_pin, stub_reader);
541 dbglog( "Using our private key '%s' in engine", pkey_identifier );
542 pkey = ENGINE_load_private_key(pkey_engine, pkey_identifier, transfer_pin, &cb_data);
544 if (transfer_pin) UI_destroy_method(transfer_pin);
547 dbglog( "Loading private key '%s' from engine", pkey_identifier );
548 pkey = ENGINE_load_private_key(pkey_engine, pkey_identifier, NULL, NULL);
552 dbglog( "Got the private key, adding it to SSL context" );
553 if (SSL_CTX_use_PrivateKey(ctx, pkey) <= 0)
555 error("EAP-TLS: Cannot use PKCS11 key %s", pkey_identifier);
561 warn("EAP-TLS: Cannot load PKCS11 key %s", pkey_identifier);
568 if (!SSL_CTX_use_PrivateKey_file(ctx, privkeyfile, SSL_FILETYPE_PEM))
570 error("EAP-TLS: Cannot use private key %s", privkeyfile);
575 if (SSL_CTX_check_private_key(ctx) != 1) {
576 error("EAP-TLS: Private key %s fails security check", privkeyfile);
580 /* Explicitly set the NO_TICKETS flag to support Win7/Win8 clients */
581 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3
582 #ifdef SSL_OP_NO_TICKET
587 /* OpenSSL 1.1.1+ does not include RC4 ciphers by default.
588 * This causes totally obsolete WinXP clients to fail. If you really
589 * need ppp+EAP-TLS+openssl 1.1.1+WinXP then enable RC4 cipers and
590 * make sure that you use an OpenSSL that supports them
592 SSL_CTX_set_cipher_list(ctx, "RC4");
596 /* Set up a SSL Session cache with a callback. This is needed for TLSv1.3+.
597 * During the initial handshake the server signals to the client early on
598 * that the handshake is finished, even before the client has sent its
599 * credentials to the server. The actual connection (and moment that the
600 * client sends its credentials) only starts after the arrival of the first
601 * session ticket. The 'ssl_new_session_cb' catches this ticket.
603 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_CLIENT | SSL_SESS_CACHE_NO_INTERNAL_STORE);
604 SSL_CTX_sess_set_new_cb(ctx, ssl_new_session_cb);
606 /* As EAP-TLS+TLSv1.3 is highly experimental we offer the user a chance to override */
609 if (strncmp(max_tls_version, "1.0", 3) == 0)
610 tls_version = TLS1_VERSION;
611 else if (strncmp(max_tls_version, "1.1", 3) == 0)
612 tls_version = TLS1_1_VERSION;
613 else if (strncmp(max_tls_version, "1.2", 3) == 0)
614 #ifdef TLS1_2_VERSION
615 tls_version = TLS1_2_VERSION;
618 warn("TLSv1.2 not available. Defaulting to TLSv1.1");
619 tls_version = TLS_1_1_VERSION;
622 else if (strncmp(max_tls_version, "1.3", 3) == 0)
623 #ifdef TLS1_3_VERSION
624 tls_version = TLS1_3_VERSION;
626 warn("TLSv1.3 not available.");
630 dbglog("EAP-TLS: Setting max protocol version to 0x%X", tls_version);
631 SSL_CTX_set_max_proto_version(ctx, tls_version);
633 SSL_CTX_set_verify_depth(ctx, 5);
634 SSL_CTX_set_verify(ctx,
636 SSL_VERIFY_FAIL_IF_NO_PEER_CERT,
637 &ssl_verify_callback);
640 if (!(certstore = SSL_CTX_get_cert_store(ctx))) {
641 error("EAP-TLS: Failed to get certificate store");
646 X509_STORE_add_lookup(certstore, X509_LOOKUP_hash_dir()))) {
647 error("EAP-TLS: Store lookup for CRL failed");
652 X509_LOOKUP_add_dir(lookup, crl_dir, X509_FILETYPE_PEM);
653 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
658 X509_CRL *crl = NULL;
660 fp = fopen(crl_file, "r");
662 error("EAP-TLS: Cannot open CRL file '%s'", crl_file);
666 crl = PEM_read_X509_CRL(fp, NULL, NULL, NULL);
668 error("EAP-TLS: Cannot read CRL file '%s'", crl_file);
672 if (!(certstore = SSL_CTX_get_cert_store(ctx))) {
673 error("EAP-TLS: Failed to get certificate store");
676 if (!X509_STORE_add_crl(certstore, crl)) {
677 error("EAP-TLS: Cannot add CRL to certificate store");
680 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
685 * If a peer certificate file was specified, it must be valid, else fail
687 if (peer_certfile[0]) {
688 if (!(tmp = get_X509_from_file(peer_certfile))) {
689 error("EAP-TLS: Error loading client certificate from file %s",
705 * Determine the maximum packet size by looking at the LCP handshake
708 int eaptls_get_mtu(int unit)
712 lcp_options *wo = &lcp_wantoptions[unit];
713 lcp_options *go = &lcp_gotoptions[unit];
714 lcp_options *ho = &lcp_hisoptions[unit];
715 lcp_options *ao = &lcp_allowoptions[unit];
717 mtu = ho->neg_mru? ho->mru: PPP_MRU;
718 mru = go->neg_mru? MAX(wo->mru, go->mru): PPP_MRU;
719 mtu = MIN(MIN(mtu, mru), ao->mru)- PPP_HDRLEN - 10;
721 dbglog("MTU = %d", mtu);
727 * Init the ssl handshake (server mode)
729 int eaptls_init_ssl_server(eap_state * esp)
731 struct eaptls_session *ets;
732 char servcertfile[MAXWORDLEN];
733 char clicertfile[MAXWORDLEN];
734 char cacertfile[MAXWORDLEN];
735 char capath[MAXWORDLEN];
736 char pkfile[MAXWORDLEN];
738 * Allocate new eaptls session
740 esp->es_server.ea_session = malloc(sizeof(struct eaptls_session));
741 if (!esp->es_server.ea_session)
742 fatal("Allocation error");
743 ets = esp->es_server.ea_session;
746 if (!esp->es_server.ea_peer) {
747 error("EAP-TLS: Error: client name not set (BUG)");
751 strlcpy(ets->peer, esp->es_server.ea_peer, MAXWORDLEN-1);
753 dbglog( "getting eaptls secret" );
754 if (!get_eaptls_secret(esp->es_unit, esp->es_server.ea_peer,
755 esp->es_server.ea_name, clicertfile,
756 servcertfile, cacertfile, capath, pkfile, 1)) {
757 error( "EAP-TLS: Cannot get secret/password for client \"%s\", server \"%s\"",
758 esp->es_server.ea_peer, esp->es_server.ea_name );
762 ets->mtu = eaptls_get_mtu(esp->es_unit);
764 ets->ctx = eaptls_init_ssl(1, cacertfile, capath, servcertfile, clicertfile, pkfile);
768 if (!(ets->ssl = SSL_new(ets->ctx)))
772 * Set auto-retry to avoid timeouts on BIO_read
774 SSL_set_mode(ets->ssl, SSL_MODE_AUTO_RETRY);
777 * Initialize the BIOs we use to read/write to ssl engine
779 ets->into_ssl = BIO_new(BIO_s_mem());
780 ets->from_ssl = BIO_new(BIO_s_mem());
781 SSL_set_bio(ets->ssl, ets->into_ssl, ets->from_ssl);
783 SSL_set_msg_callback(ets->ssl, ssl_msg_callback);
784 SSL_set_msg_callback_arg(ets->ssl, ets);
787 * Attach the session struct to the connection, so we can later
788 * retrieve it when doing certificate verification
790 SSL_set_ex_data(ets->ssl, 0, ets);
792 SSL_set_accept_state(ets->ssl);
802 * If we specified the client certificate file, store it in ets->peercertfile,
803 * so we can check it later in ssl_verify_callback()
806 strlcpy(&ets->peercertfile[0], clicertfile, MAXWORDLEN);
808 ets->peercertfile[0] = 0;
813 SSL_CTX_free(ets->ctx);
818 * Init the ssl handshake (client mode)
820 int eaptls_init_ssl_client(eap_state * esp)
822 struct eaptls_session *ets;
823 char servcertfile[MAXWORDLEN];
824 char clicertfile[MAXWORDLEN];
825 char cacertfile[MAXWORDLEN];
826 char capath[MAXWORDLEN];
827 char pkfile[MAXWORDLEN];
830 * Allocate new eaptls session
832 esp->es_client.ea_session = malloc(sizeof(struct eaptls_session));
833 if (!esp->es_client.ea_session)
834 fatal("Allocation error");
835 ets = esp->es_client.ea_session;
839 * If available, copy server name in ets; it will be used in cert
842 if (esp->es_client.ea_peer)
843 strlcpy(ets->peer, esp->es_client.ea_peer, MAXWORDLEN-1);
847 ets->mtu = eaptls_get_mtu(esp->es_unit);
849 dbglog( "calling get_eaptls_secret" );
850 if (!get_eaptls_secret(esp->es_unit, esp->es_client.ea_name,
851 ets->peer, clicertfile,
852 servcertfile, cacertfile, capath, pkfile, 0)) {
853 error( "EAP-TLS: Cannot get secret/password for client \"%s\", server \"%s\"",
854 esp->es_client.ea_name, ets->peer );
858 dbglog( "calling eaptls_init_ssl" );
859 ets->ctx = eaptls_init_ssl(0, cacertfile, capath, clicertfile, servcertfile, pkfile);
863 ets->ssl = SSL_new(ets->ctx);
869 * Initialize the BIOs we use to read/write to ssl engine
871 dbglog( "Initializing SSL BIOs" );
872 ets->into_ssl = BIO_new(BIO_s_mem());
873 ets->from_ssl = BIO_new(BIO_s_mem());
874 SSL_set_bio(ets->ssl, ets->into_ssl, ets->from_ssl);
876 SSL_set_msg_callback(ets->ssl, ssl_msg_callback);
877 SSL_set_msg_callback_arg(ets->ssl, ets);
880 * Attach the session struct to the connection, so we can later
881 * retrieve it when doing certificate verification
883 SSL_set_ex_data(ets->ssl, 0, ets);
885 SSL_set_connect_state(ets->ssl);
895 * If we specified the server certificate file, store it in
896 * ets->peercertfile, so we can check it later in
897 * ssl_verify_callback()
900 strlcpy(ets->peercertfile, servcertfile, MAXWORDLEN);
902 ets->peercertfile[0] = 0;
907 dbglog( "eaptls_init_ssl_client: fail" );
908 SSL_CTX_free(ets->ctx);
913 void eaptls_free_session(struct eaptls_session *ets)
919 SSL_CTX_free(ets->ctx);
925 int eaptls_is_init_finished(struct eaptls_session *ets)
927 if (ets->ssl && SSL_is_init_finished(ets->ssl))
930 return have_session_ticket;
939 * Handle a received packet, reassembling fragmented messages and
940 * passing them to the ssl engine
942 int eaptls_receive(struct eaptls_session *ets, u_char * inp, int len)
949 warn("EAP-TLS: received no or invalid data");
956 if (flags & EAP_TLS_FLAGS_LI && len > 4) {
958 * LenghtIncluded flag set -> this is the first packet of a message
962 * the first 4 octets are the length of the EAP-TLS message
964 GETLONG(tlslen, inp);
969 if (tlslen > EAP_TLS_MAX_LEN) {
970 error("EAP-TLS: TLS message length > %d, truncated", EAP_TLS_MAX_LEN);
971 tlslen = EAP_TLS_MAX_LEN;
975 * Allocate memory for the whole message
977 ets->data = malloc(tlslen);
979 fatal("EAP-TLS: allocation error\n");
982 ets->tlslen = tlslen;
985 warn("EAP-TLS: non-first LI packet? that's odd...");
987 else if (!ets->data) {
989 * A non fragmented message without LI flag
992 ets->data = malloc(len);
994 fatal("EAP-TLS: memory allocation error in eaptls_receive\n");
1000 if (flags & EAP_TLS_FLAGS_MF)
1006 warn("EAP-TLS: received malformed data");
1010 if (len + ets->datalen > ets->tlslen) {
1011 warn("EAP-TLS: received data > TLS message length");
1015 BCOPY(inp, ets->data + ets->datalen, len);
1016 ets->datalen += len;
1021 * If we have the whole message, pass it to ssl
1024 if (ets->datalen != ets->tlslen) {
1025 warn("EAP-TLS: received data != TLS message length");
1029 if (BIO_write(ets->into_ssl, ets->data, ets->datalen) == -1)
1032 SSL_read(ets->ssl, dummy, 65536);
1043 * Return an eap-tls packet in outp.
1044 * A TLS message read from the ssl engine is buffered in ets->data.
1045 * At each call we control if there is buffered data and send a
1046 * packet of mtu bytes.
1048 int eaptls_send(struct eaptls_session *ets, u_char ** outp)
1052 u_char fromtls[65536];
1060 if(!ets->alert_sent)
1062 res = SSL_read(ets->ssl, fromtls, 65536);
1068 if ((res = BIO_read(ets->from_ssl, fromtls, 65536)) == -1)
1070 warn("EAP-TLS send: No data from BIO_read");
1076 ets->data = malloc(ets->datalen);
1078 fatal("EAP-TLS: memory allocation error in eaptls_send\n");
1080 BCOPY(fromtls, ets->data, ets->datalen);
1086 size = ets->datalen - ets->offset;
1088 if (size > ets->mtu) {
1094 PUTCHAR(EAPT_TLS, *outp);
1097 * Set right flags and length if necessary
1099 if (ets->frag && first) {
1100 PUTCHAR(EAP_TLS_FLAGS_LI | EAP_TLS_FLAGS_MF, *outp);
1101 PUTLONG(ets->datalen, *outp);
1102 } else if (ets->frag) {
1103 PUTCHAR(EAP_TLS_FLAGS_MF, *outp);
1108 * Copy the data in outp
1110 BCOPY(ets->data + ets->offset, *outp, size);
1111 INCPTR(size, *outp);
1114 * Copy the packet in retransmission buffer
1116 BCOPY(start, &ets->rtx[0], *outp - start);
1117 ets->rtx_len = *outp - start;
1119 ets->offset += size;
1121 if (ets->offset >= ets->datalen) {
1124 * The whole message has been sent
1137 * Get the sent packet from the retransmission buffer
1139 void eaptls_retransmit(struct eaptls_session *ets, u_char ** outp)
1141 BCOPY(ets->rtx, *outp, ets->rtx_len);
1142 INCPTR(ets->rtx_len, *outp);
1146 * Verify a certificate.
1147 * Most of the work (signatures and issuer attributes checking)
1148 * is done by ssl; we check the CN in the peer certificate
1149 * against the peer name.
1151 int ssl_verify_callback(int ok, X509_STORE_CTX * ctx)
1158 struct eaptls_session *ets;
1159 char *ptr1 = NULL, *ptr2 = NULL;
1161 peer_cert = X509_STORE_CTX_get_current_cert(ctx);
1162 err = X509_STORE_CTX_get_error(ctx);
1163 depth = X509_STORE_CTX_get_error_depth(ctx);
1165 dbglog("certificate verify depth: %d", depth);
1167 if (auth_required && !ok) {
1168 X509_NAME_oneline(X509_get_subject_name(peer_cert),
1171 X509_NAME_get_text_by_NID(X509_get_subject_name(peer_cert),
1172 NID_commonName, cn_str, 256);
1174 dbglog("Certificate verification error:\n depth: %d CN: %s"
1175 "\n err: %d (%s)\n", depth, cn_str, err,
1176 X509_verify_cert_error_string(err));
1181 ssl = X509_STORE_CTX_get_ex_data(ctx,
1182 SSL_get_ex_data_X509_STORE_CTX_idx());
1184 ets = (struct eaptls_session *)SSL_get_ex_data(ssl, 0);
1187 error("Error: SSL_get_ex_data returned NULL");
1195 /* Verify certificate based on certificate type and extended key usage */
1196 if (tls_verify_key_usage) {
1197 int purpose = ets->client ? X509_PURPOSE_SSL_SERVER : X509_PURPOSE_SSL_CLIENT ;
1198 if (X509_check_purpose(peer_cert, purpose, 0) == 0) {
1199 error("Certificate verification error: nsCertType mismatch");
1203 #if OPENSSL_VERSION_NUMBER >= 0x10100000L
1204 int flags = ets->client ? XKU_SSL_SERVER : XKU_SSL_CLIENT;
1205 if (!(X509_get_extended_key_usage(peer_cert) & flags)) {
1206 error("Certificate verification error: invalid extended key usage");
1210 info("Certificate key usage: OK");
1214 * If acting as client and the name of the server wasn't specified
1215 * explicitely, we can't verify the server authenticity
1217 if (!tls_verify_method)
1218 tls_verify_method = TLS_VERIFY_NONE;
1220 if (!ets->peer[0] || !strcmp(TLS_VERIFY_NONE, tls_verify_method)) {
1221 warn("Certificate verication disabled or no peer name was specified");
1225 /* This is the peer certificate */
1226 X509_NAME_oneline(X509_get_subject_name(peer_cert),
1229 X509_NAME_get_text_by_NID(X509_get_subject_name(peer_cert),
1230 NID_commonName, cn_str, 256);
1232 /* Verify based on subject name */
1234 if (!strcmp(TLS_VERIFY_SUBJECT, tls_verify_method)) {
1238 /* Verify based on common name (default) */
1239 if (strlen(tls_verify_method) == 0 ||
1240 !strcmp(TLS_VERIFY_NAME, tls_verify_method)) {
1244 /* Match the suffix of common name */
1245 if (!strcmp(TLS_VERIFY_SUFFIX, tls_verify_method)) {
1246 int len = strlen(ptr1);
1247 int off = strlen(cn_str) - len;
1250 ptr2 = cn_str + off;
1254 if (strcmp(ptr1, ptr2)) {
1255 error("Certificate verification error: CN (%s) != %s", ptr1, ptr2);
1259 info("Certificate CN: %s, peer name %s", cn_str, ets->peer);
1262 * If a peer certificate file was specified, here we check it
1264 if (ets->peercertfile[0]) {
1265 if (ssl_cmp_certs(&ets->peercertfile[0], peer_cert)
1268 ("Peer certificate doesn't match stored certificate");
1278 * Compare a certificate with the one stored in a file
1280 int ssl_cmp_certs(char *filename, X509 * a)
1285 if (!(b = get_X509_from_file(filename)))
1288 ret = X509_cmp(a, b);
1295 X509 *get_X509_from_file(char *filename)
1300 if (!(fp = fopen(filename, "r")))
1303 ret = PEM_read_X509(fp, NULL, NULL, NULL);
1311 * Every sent & received message this callback function is invoked,
1312 * so we know when alert messages have arrived or are sent and
1313 * we can print debug information about TLS handshake.
1316 ssl_msg_callback(int write_p, int version, int content_type,
1317 const void *buf, size_t len, SSL * ssl, void *arg)
1320 struct eaptls_session *ets = (struct eaptls_session *)arg;
1322 const unsigned char*msg = buf;
1323 int hvers = msg[1] << 8 | msg[2];
1326 strcpy(string, " -> ");
1328 strcpy(string, " <- ");
1330 switch(content_type) {
1332 case SSL3_RT_HEADER:
1333 strcat(string, "SSL/TLS Header: ");
1336 strcat(string, "SSL 3.0");
1339 strcat(string, "TLS 1.0");
1341 case TLS1_1_VERSION:
1342 strcat(string, "TLS 1.1");
1344 case TLS1_2_VERSION:
1345 strcat(string, "TLS 1.2");
1348 sprintf(string, "SSL/TLS Header: Unknown version (%d)", hvers);
1353 strcat(string, "Alert: ");
1357 ets->alert_sent = 1;
1358 ets->alert_sent_desc = code;
1360 ets->alert_recv = 1;
1361 ets->alert_recv_desc = code;
1364 strcat(string, SSL_alert_desc_string_long(code));
1367 case SSL3_RT_CHANGE_CIPHER_SPEC:
1368 strcat(string, "ChangeCipherSpec");
1371 #ifdef SSL3_RT_INNER_CONTENT_TYPE
1372 case SSL3_RT_INNER_CONTENT_TYPE:
1373 strcat(string, "InnerContentType (TLS1.3)");
1377 case SSL3_RT_HANDSHAKE:
1379 strcat(string, "Handshake: ");
1383 case SSL3_MT_HELLO_REQUEST:
1384 strcat(string,"Hello Request");
1386 case SSL3_MT_CLIENT_HELLO:
1387 strcat(string,"Client Hello");
1389 case SSL3_MT_SERVER_HELLO:
1390 strcat(string,"Server Hello");
1392 #ifdef SSL3_MT_NEWSESSION_TICKET
1393 case SSL3_MT_NEWSESSION_TICKET:
1394 strcat(string,"New Session Ticket");
1397 #ifdef SSL3_MT_END_OF_EARLY_DATA
1398 case SSL3_MT_END_OF_EARLY_DATA:
1399 strcat(string,"End of Early Data");
1402 #ifdef SSL3_MT_ENCRYPTED_EXTENSIONS
1403 case SSL3_MT_ENCRYPTED_EXTENSIONS:
1404 strcat(string,"Encryped Extensions");
1407 case SSL3_MT_CERTIFICATE:
1408 strcat(string,"Certificate");
1410 case SSL3_MT_SERVER_KEY_EXCHANGE:
1411 strcat(string,"Server Key Exchange");
1413 case SSL3_MT_CERTIFICATE_REQUEST:
1414 strcat(string,"Certificate Request");
1416 case SSL3_MT_SERVER_DONE:
1417 strcat(string,"Server Hello Done");
1419 case SSL3_MT_CERTIFICATE_VERIFY:
1420 strcat(string,"Certificate Verify");
1422 case SSL3_MT_CLIENT_KEY_EXCHANGE:
1423 strcat(string,"Client Key Exchange");
1425 case SSL3_MT_FINISHED:
1426 strcat(string,"Finished: ");
1427 hvers = SSL_version(ssl);
1430 strcat(string, "SSL 3.0");
1433 strcat(string, "TLS 1.0");
1435 case TLS1_1_VERSION:
1436 strcat(string, "TLS 1.1");
1438 case TLS1_2_VERSION:
1439 strcat(string, "TLS 1.2");
1441 #ifdef TLS1_3_VERSION
1442 case TLS1_3_VERSION:
1443 strcat(string, "TLS 1.3 (experimental)");
1448 strcat(string, "Unknown version");
1452 sprintf( string, "Handshake: Unknown SSL3 code received: %d", code );
1457 sprintf( string, "SSL message contains unknown content type: %d", content_type );
1460 /* Alert messages must always be displayed */
1461 if(content_type == SSL3_RT_ALERT)
1462 error("%s", string);
1464 dbglog("%s", string);
1468 ssl_new_session_cb(SSL *s, SSL_SESSION *sess)
1470 dbglog("EAP-TLS: Post-Handshake New Session Ticket arrived:");
1471 have_session_ticket = 1;
1473 /* always return success */