2 * rlm_eap_tls.c contains the interfaces that are called from eap
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
20 * Copyright 2001 hereUare Communications, Inc. <raghud@hereuare.com>
21 * Copyright 2003 Alan DeKok <aland@freeradius.org>
22 * Copyright 2006 The FreeRADIUS server project
26 #include <freeradius-devel/ident.h>
29 #include <freeradius-devel/autoconf.h>
31 #ifdef HAVE_OPENSSL_RAND_H
32 #include <openssl/rand.h>
35 #ifdef HAVE_OPENSSL_EVP_H
36 #include <openssl/evp.h>
39 #include "rlm_eap_tls.h"
42 #ifdef HAVE_SYS_STAT_H
46 static CONF_PARSER cache_config[] = {
47 { "enable", PW_TYPE_BOOLEAN,
48 offsetof(EAP_TLS_CONF, session_cache_enable), NULL, "no" },
49 { "lifetime", PW_TYPE_INTEGER,
50 offsetof(EAP_TLS_CONF, session_timeout), NULL, "24" },
51 { "max_entries", PW_TYPE_INTEGER,
52 offsetof(EAP_TLS_CONF, session_cache_size), NULL, "255" },
53 { "name", PW_TYPE_STRING_PTR,
54 offsetof(EAP_TLS_CONF, session_id_name), NULL, NULL},
55 { NULL, -1, 0, NULL, NULL } /* end the list */
58 static CONF_PARSER module_config[] = {
59 { "rsa_key_exchange", PW_TYPE_BOOLEAN,
60 offsetof(EAP_TLS_CONF, rsa_key), NULL, "no" },
61 { "dh_key_exchange", PW_TYPE_BOOLEAN,
62 offsetof(EAP_TLS_CONF, dh_key), NULL, "yes" },
63 { "rsa_key_length", PW_TYPE_INTEGER,
64 offsetof(EAP_TLS_CONF, rsa_key_length), NULL, "512" },
65 { "dh_key_length", PW_TYPE_INTEGER,
66 offsetof(EAP_TLS_CONF, dh_key_length), NULL, "512" },
67 { "verify_depth", PW_TYPE_INTEGER,
68 offsetof(EAP_TLS_CONF, verify_depth), NULL, "0" },
69 { "CA_path", PW_TYPE_FILENAME,
70 offsetof(EAP_TLS_CONF, ca_path), NULL, NULL },
71 { "pem_file_type", PW_TYPE_BOOLEAN,
72 offsetof(EAP_TLS_CONF, file_type), NULL, "yes" },
73 { "private_key_file", PW_TYPE_FILENAME,
74 offsetof(EAP_TLS_CONF, private_key_file), NULL, NULL },
75 { "certificate_file", PW_TYPE_FILENAME,
76 offsetof(EAP_TLS_CONF, certificate_file), NULL, NULL },
77 { "CA_file", PW_TYPE_FILENAME,
78 offsetof(EAP_TLS_CONF, ca_file), NULL, NULL },
79 { "private_key_password", PW_TYPE_STRING_PTR,
80 offsetof(EAP_TLS_CONF, private_key_password), NULL, NULL },
81 { "dh_file", PW_TYPE_STRING_PTR,
82 offsetof(EAP_TLS_CONF, dh_file), NULL, NULL },
83 { "random_file", PW_TYPE_STRING_PTR,
84 offsetof(EAP_TLS_CONF, random_file), NULL, NULL },
85 { "fragment_size", PW_TYPE_INTEGER,
86 offsetof(EAP_TLS_CONF, fragment_size), NULL, "1024" },
87 { "include_length", PW_TYPE_BOOLEAN,
88 offsetof(EAP_TLS_CONF, include_length), NULL, "yes" },
89 { "check_crl", PW_TYPE_BOOLEAN,
90 offsetof(EAP_TLS_CONF, check_crl), NULL, "no"},
91 { "check_cert_cn", PW_TYPE_STRING_PTR,
92 offsetof(EAP_TLS_CONF, check_cert_cn), NULL, NULL},
93 { "cipher_list", PW_TYPE_STRING_PTR,
94 offsetof(EAP_TLS_CONF, cipher_list), NULL, NULL},
95 { "check_cert_issuer", PW_TYPE_STRING_PTR,
96 offsetof(EAP_TLS_CONF, check_cert_issuer), NULL, NULL},
97 { "make_cert_command", PW_TYPE_STRING_PTR,
98 offsetof(EAP_TLS_CONF, make_cert_command), NULL, NULL},
100 { "cache", PW_TYPE_SUBSECTION, 0, NULL, (const void *) cache_config },
102 { NULL, -1, 0, NULL, NULL } /* end the list */
107 * TODO: Check for the type of key exchange * like conf->dh_key
109 static int load_dh_params(SSL_CTX *ctx, char *file)
114 if ((bio = BIO_new_file(file, "r")) == NULL) {
115 radlog(L_ERR, "rlm_eap_tls: Unable to open DH file - %s", file);
119 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
122 DEBUG2("WARNING: rlm_eap_tls: Unable to set DH parameters. DH cipher suites may not work!");
123 DEBUG2("WARNING: Fix this by running the OpenSSL command listed in eap.conf");
127 if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
128 radlog(L_ERR, "rlm_eap_tls: Unable to set DH parameters");
139 * Generate ephemeral RSA keys.
141 static int generate_eph_rsa_key(SSL_CTX *ctx)
145 rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
147 if (!SSL_CTX_set_tmp_rsa(ctx, rsa)) {
148 radlog(L_ERR, "rlm_eap_tls: Couldn't set ephemeral RSA key");
158 * These functions don't do anything other than print debugging
161 * FIXME: Write sessions to some long-term storage, so that
162 * session resumption can still occur after the server
165 #define MAX_SESSION_SIZE (256)
167 static void cbtls_remove_session(UNUSED SSL_CTX *ctx, SSL_SESSION *sess)
170 char buffer[2 * MAX_SESSION_SIZE + 1];
172 size = sess->session_id_length;
173 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
175 fr_bin2hex(sess->session_id, buffer, size);
177 DEBUG2(" SSL: Removing session %s from the cache", buffer);
178 SSL_SESSION_free(sess);
183 static int cbtls_new_session(UNUSED SSL *s, SSL_SESSION *sess)
186 char buffer[2 * MAX_SESSION_SIZE + 1];
188 size = sess->session_id_length;
189 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
191 fr_bin2hex(sess->session_id, buffer, size);
193 DEBUG2(" SSL: adding session %s to cache", buffer);
198 static SSL_SESSION *cbtls_get_session(UNUSED SSL *s,
199 unsigned char *data, int len,
203 char buffer[2 * MAX_SESSION_SIZE + 1];
206 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
208 fr_bin2hex(data, buffer, size);
210 DEBUG2(" SSL: Client requested nonexistent cached session %s",
217 * For creating certificate attributes.
219 static const char *cert_attr_names[5][2] = {
220 { "TLS-Client-Cert-Serial", "TLS-Cert-Serial" },
221 { "TLS-Client-Cert-Expiration", "TLS-Cert-Expiraton" },
222 { "TLS-Client-Cert-Issuer", "TLS-Cert-Issuer" },
223 { "TLS-Client-Cert-Subject", "TLS-Cert-Subject" },
224 { "TLS-Client-Cert-Common-Name", "TLS-Cert-Common-Name" }
229 * Before trusting a certificate, you must make sure that the
230 * certificate is 'valid'. There are several steps that your
231 * application can take in determining if a certificate is
232 * valid. Commonly used steps are:
234 * 1.Verifying the certificate's signature, and verifying that
235 * the certificate has been issued by a trusted Certificate
238 * 2.Verifying that the certificate is valid for the present date
239 * (i.e. it is being presented within its validity dates).
241 * 3.Verifying that the certificate has not been revoked by its
242 * issuing Certificate Authority, by checking with respect to a
243 * Certificate Revocation List (CRL).
245 * 4.Verifying that the credentials presented by the certificate
246 * fulfill additional requirements specific to the application,
247 * such as with respect to access control lists or with respect
248 * to OCSP (Online Certificate Status Processing).
250 * NOTE: This callback will be called multiple times based on the
251 * depth of the root certificate chain
253 static int cbtls_verify(int ok, X509_STORE_CTX *ctx)
255 char subject[1024]; /* Used for the subject name */
256 char issuer[1024]; /* Used for the issuer name */
257 char common_name[1024];
260 EAP_HANDLER *handler = NULL;
263 int err, depth, lookup;
267 ASN1_INTEGER *sn = NULL;
268 ASN1_TIME *asn_time = NULL;
270 client_cert = X509_STORE_CTX_get_current_cert(ctx);
271 err = X509_STORE_CTX_get_error(ctx);
272 depth = X509_STORE_CTX_get_error_depth(ctx);
275 if (lookup > 1) lookup = 1;
278 * Retrieve the pointer to the SSL of the connection currently treated
279 * and the application specific data stored into the SSL object.
281 ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
282 handler = (EAP_HANDLER *)SSL_get_ex_data(ssl, 0);
283 request = handler->request;
284 conf = (EAP_TLS_CONF *)SSL_get_ex_data(ssl, 1);
287 * Get the Serial Number
290 sn = X509_get_serialNumber(client_cert);
291 if (sn && (sn->length < (sizeof(buf) / 2))) {
295 for (i = 0; i < sn->length; i++) {
296 sprintf(buf, "%02x", (unsigned int)sn->data[i]);
299 pairadd(&handler->certs,
300 pairmake(cert_attr_names[0][lookup], buf, T_OP_SET));
305 * Get the Expiration Date
308 asn_time = X509_get_notAfter(client_cert);
309 if (asn_time && (asn_time->length < MAX_STRING_LEN)) {
310 memcpy(buf, (char*) asn_time->data, asn_time->length);
311 buf[asn_time->length] = '\0';
312 pairadd(&handler->certs,
313 pairmake(cert_attr_names[1][lookup], buf, T_OP_SET));
317 * Get the Subject & Issuer
319 subject[0] = issuer[0] = '\0';
320 X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
322 subject[sizeof(subject) - 1] = '\0';
323 if (subject[0] && (strlen(subject) < MAX_STRING_LEN)) {
324 pairadd(&handler->certs,
325 pairmake(cert_attr_names[2][lookup], subject, T_OP_SET));
328 X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
330 issuer[sizeof(issuer) - 1] = '\0';
331 if (issuer[0] && (strlen(issuer) < MAX_STRING_LEN)) {
332 pairadd(&handler->certs,
333 pairmake(cert_attr_names[3][lookup], issuer, T_OP_SET));
337 * Get the Common Name
339 X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
340 NID_commonName, common_name, sizeof(common_name));
341 common_name[sizeof(common_name) - 1] = '\0';
342 if (common_name[0] && (strlen(common_name) < MAX_STRING_LEN)) {
343 pairadd(&handler->certs,
344 pairmake(cert_attr_names[4][lookup], common_name, T_OP_SET));
348 const char *p = X509_verify_cert_error_string(err);
349 radlog(L_ERR,"--> verify error:num=%d:%s\n",err, p);
350 radius_pairmake(request, &request->packet->vps,
351 "Module-Failure-Message", p, T_OP_SET);
355 switch (ctx->error) {
357 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
358 radlog(L_ERR, "issuer= %s\n", issuer);
360 case X509_V_ERR_CERT_NOT_YET_VALID:
361 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
362 radlog(L_ERR, "notBefore=");
364 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
367 case X509_V_ERR_CERT_HAS_EXPIRED:
368 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
369 radlog(L_ERR, "notAfter=");
371 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
377 * If we're at the actual client cert, apply additional
382 * If the conf tells us to, check cert issuer
383 * against the specified value and fail
384 * verification if they don't match.
386 if (conf->check_cert_issuer &&
387 (strcmp(issuer, conf->check_cert_issuer) != 0)) {
388 radlog(L_AUTH, "rlm_eap_tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
393 * If the conf tells us to, check the CN in the
394 * cert against xlat'ed value, but only if the
395 * previous checks passed.
397 if (my_ok && conf->check_cert_cn) {
398 if (!radius_xlat(cn_str, sizeof(cn_str), conf->check_cert_cn, handler->request, NULL)) {
399 radlog(L_ERR, "rlm_eap_tls (%s): xlat failed.",
400 conf->check_cert_cn);
401 /* if this fails, fail the verification */
404 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
405 if (strcmp(cn_str, common_name) != 0) {
406 radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
410 } /* check_cert_cn */
413 if (debug_flag > 0) {
414 RDEBUG2("chain-depth=%d, ", depth);
415 RDEBUG2("error=%d", err);
417 RDEBUG2("--> User-Name = %s", handler->identity);
418 RDEBUG2("--> BUF-Name = %s", common_name);
419 RDEBUG2("--> subject = %s", subject);
420 RDEBUG2("--> issuer = %s", issuer);
421 RDEBUG2("--> verify return:%d", my_ok);
428 * Free cached session data, which is always a list of VALUE_PAIRs
430 static void eaptls_session_free(UNUSED void *parent, void *data_ptr,
431 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
432 UNUSED long argl, UNUSED void *argp)
434 VALUE_PAIR *vp = data_ptr;
435 if (!data_ptr) return;
442 * Create Global context SSL and use it in every new session
444 * - Load the trusted CAs
445 * - Load the Private key & the certificate
446 * - Set the Context options & Verify options
448 static SSL_CTX *init_tls_ctx(EAP_TLS_CONF *conf)
452 X509_STORE *certstore;
453 int verify_mode = SSL_VERIFY_NONE;
458 * Add all the default ciphers and message digests
459 * Create our context.
462 SSL_load_error_strings();
465 * SHA256 is in all versions of OpenSSL, but isn't
466 * initialized by default. It's needed for WiMAX
469 #ifdef HAVE_OPENSSL_EVP_SHA256
470 EVP_add_digest(EVP_sha256());
473 meth = TLSv1_method();
474 ctx = SSL_CTX_new(meth);
477 * Identify the type of certificates that needs to be loaded
479 if (conf->file_type) {
480 type = SSL_FILETYPE_PEM;
482 type = SSL_FILETYPE_ASN1;
486 * Set the password to load private key
488 if (conf->private_key_password) {
491 * We don't want to put the private key password in eap.conf, so check
492 * for our special string which indicates we should get the password
495 const char* special_string = "Apple:UseCertAdmin";
496 if (strncmp(conf->private_key_password,
498 strlen(special_string)) == 0)
501 const long max_password_len = 128;
502 snprintf(cmd, sizeof(cmd) - 1,
503 "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
504 conf->private_key_file);
506 DEBUG2("rlm_eap: Getting private key passphrase using command \"%s\"", cmd);
508 FILE* cmd_pipe = popen(cmd, "r");
510 radlog(L_ERR, "rlm_eap: %s command failed. Unable to get private_key_password", cmd);
511 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
515 free(conf->private_key_password);
516 conf->private_key_password = malloc(max_password_len * sizeof(char));
517 if (!conf->private_key_password) {
518 radlog(L_ERR, "rlm_eap: Can't malloc space for private_key_password");
519 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
524 fgets(conf->private_key_password, max_password_len, cmd_pipe);
527 /* Get rid of newline at end of password. */
528 conf->private_key_password[strlen(conf->private_key_password) - 1] = '\0';
529 DEBUG2("rlm_eap: Password from command = \"%s\"", conf->private_key_password);
532 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->private_key_password);
533 SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
537 * Load our keys and certificates
539 * If certificates are of type PEM then we can make use
540 * of cert chain authentication using openssl api call
541 * SSL_CTX_use_certificate_chain_file. Please see how
542 * the cert chain needs to be given in PEM from
545 if (type == SSL_FILETYPE_PEM) {
546 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
547 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
548 radlog(L_ERR, "rlm_eap_tls: Error reading certificate file %s", conf->certificate_file);
552 } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
553 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
554 radlog(L_ERR, "rlm_eap_tls: Error reading certificate file %s", conf->certificate_file);
558 /* Load the CAs we trust */
559 if (conf->ca_file || conf->ca_path) {
560 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
561 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
562 radlog(L_ERR, "rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
566 if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
567 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
568 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
569 radlog(L_ERR, "rlm_eap_tls: Error reading private key file %s", conf->private_key_file);
574 * Check if the loaded private key is the right one
576 if (!SSL_CTX_check_private_key(ctx)) {
577 radlog(L_ERR, "rlm_eap_tls: Private key does not match the certificate public key");
584 ctx_options |= SSL_OP_NO_SSLv2;
585 ctx_options |= SSL_OP_NO_SSLv3;
586 #ifdef SSL_OP_NO_TICKET
587 ctx_options |= SSL_OP_NO_TICKET ;
591 * SSL_OP_SINGLE_DH_USE must be used in order to prevent
592 * small subgroup attacks and forward secrecy. Always
595 * SSL_OP_SINGLE_DH_USE has an impact on the computer
596 * time needed during negotiation, but it is not very
599 ctx_options |= SSL_OP_SINGLE_DH_USE;
602 * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
603 * in Windows Vista client.
604 * http://www.openssl.org/~bodo/tls-cbc.txt
605 * http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
607 ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
609 SSL_CTX_set_options(ctx, ctx_options);
612 * TODO: Set the RSA & DH
613 * SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
614 * SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
618 * set the message callback to identify the type of
619 * message. For every new session, there can be a
620 * different callback argument.
622 * SSL_CTX_set_msg_callback(ctx, cbtls_msg);
625 /* Set Info callback */
626 SSL_CTX_set_info_callback(ctx, cbtls_info);
629 * Callbacks, etc. for session resumption.
631 if (conf->session_cache_enable) {
632 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
633 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
634 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
636 SSL_CTX_set_quiet_shutdown(ctx, 1);
640 * Check the certificates for revocation.
642 #ifdef X509_V_FLAG_CRL_CHECK
643 if (conf->check_crl) {
644 certstore = SSL_CTX_get_cert_store(ctx);
645 if (certstore == NULL) {
646 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
647 radlog(L_ERR, "rlm_eap_tls: Error reading Certificate Store");
650 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
656 * Always verify the peer certificate
658 verify_mode |= SSL_VERIFY_PEER;
659 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
660 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
661 SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
663 if (conf->verify_depth) {
664 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
667 /* Load randomness */
668 if (!(RAND_load_file(conf->random_file, 1024*1024))) {
669 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
670 radlog(L_ERR, "rlm_eap_tls: Error loading randomness");
675 * Set the cipher list if we were told to
677 if (conf->cipher_list) {
678 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
679 radlog(L_ERR, "rlm_eap_tls: Error setting cipher list");
685 * Setup session caching
687 if (conf->session_cache_enable) {
689 * Create a unique context Id per EAP-TLS configuration.
691 if (conf->session_id_name) {
692 snprintf(conf->session_context_id,
693 sizeof(conf->session_context_id),
694 "FreeRADIUS EAP-TLS %s",
695 conf->session_id_name);
697 snprintf(conf->session_context_id,
698 sizeof(conf->session_context_id),
699 "FreeRADIUS EAP-TLS %p", conf);
703 * Cache it, and DON'T auto-clear it.
705 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
707 SSL_CTX_set_session_id_context(ctx,
708 (unsigned char *) conf->session_context_id,
709 (unsigned int) strlen(conf->session_context_id));
712 * Our timeout is in hours, this is in seconds.
714 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
717 * Set the maximum number of entries in the
720 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
723 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
727 * Register the application indices. We can't use
728 * hard-coded "0" and "1" as before, because we need to
729 * set up a "free" handler for the cached session
732 if (eaptls_handle_idx < 0) {
733 eaptls_handle_idx = SSL_get_ex_new_index(0, "eaptls_handle_idx",
737 if (eaptls_conf_idx < 0) {
738 eaptls_conf_idx = SSL_get_ex_new_index(0, "eaptls_conf_idx",
742 if (eaptls_session_idx < 0) {
743 eaptls_session_idx = SSL_get_ex_new_index(0, "eaptls_session_idx",
745 eaptls_session_free);
753 * Detach the EAP-TLS module.
755 static int eaptls_detach(void *arg)
760 inst = (eap_tls_t *) arg;
764 memset(conf, 0, sizeof(*conf));
769 if (inst->ctx) SSL_CTX_free(inst->ctx);
779 * Attach the EAP-TLS module.
781 static int eaptls_attach(CONF_SECTION *cs, void **instance)
786 /* Store all these values in the data structure for later references */
787 inst = (eap_tls_t *)malloc(sizeof(*inst));
789 radlog(L_ERR, "rlm_eap_tls: out of memory");
792 memset(inst, 0, sizeof(*inst));
795 * Parse the config file & get all the configured values
797 conf = (EAP_TLS_CONF *)malloc(sizeof(*conf));
800 radlog(L_ERR, "rlm_eap_tls: out of memory");
803 memset(conf, 0, sizeof(*conf));
806 if (cf_section_parse(cs, conf, module_config) < 0) {
812 * The EAP RFC's say 1020, but we're less picky.
814 if (conf->fragment_size < 100) {
815 radlog(L_ERR, "rlm_eap_tls: Fragment size is too small.");
821 * The maximum size for a RADIUS packet is 4096,
822 * minus the header (20), Message-Authenticator (18),
823 * and State (18), etc. results in about 4000 bytes of data
824 * that can be devoted *solely* to EAP.
826 if (conf->fragment_size > 4000) {
827 radlog(L_ERR, "rlm_eap_tls: Fragment size is too large.");
833 * Account for the EAP header (4), and the EAP-TLS header
834 * (6), as per Section 4.2 of RFC 2716. What's left is
835 * the maximum amount of data we read from a TLS buffer.
837 conf->fragment_size -= 10;
840 * This magic makes the administrators life HUGELY easier
841 * on initial deployments.
843 * If the server starts up in debugging mode, AND the
844 * bootstrap command is configured, AND it exists, AND
845 * there is no server certificate
847 if (conf->make_cert_command && (debug_flag >= 2)) {
850 if ((stat(conf->make_cert_command, &buf) == 0) &&
851 (stat(conf->certificate_file, &buf) < 0) &&
853 (radius_exec_program(conf->make_cert_command, NULL, 1,
854 NULL, 0, NULL, NULL, 0) != 0)) {
864 inst->ctx = init_tls_ctx(conf);
865 if (inst->ctx == NULL) {
870 if (load_dh_params(inst->ctx, conf->dh_file) < 0) {
875 if (generate_eph_rsa_key(inst->ctx) < 0) {
886 * Send an initial eap-tls request to the peer.
888 * Frame eap reply packet.
889 * len = header + type + tls_typedata
890 * tls_typedata = flags(Start (S) bit set, and no data)
892 * Once having received the peer's Identity, the EAP server MUST
893 * respond with an EAP-TLS/Start packet, which is an
894 * EAP-Request packet with EAP-Type=EAP-TLS, the Start (S) bit
895 * set, and no data. The EAP-TLS conversation will then begin,
896 * with the peer sending an EAP-Response packet with
897 * EAP-Type = EAP-TLS. The data field of that packet will
900 * Fragment length is Framed-MTU - 4.
902 * http://mail.frascone.com/pipermail/public/eap/2003-July/001426.html
904 static int eaptls_initiate(void *type_arg, EAP_HANDLER *handler)
910 int client_cert = TRUE;
912 REQUEST *request = handler->request;
914 inst = (eap_tls_t *)type_arg;
917 handler->finished = FALSE;
920 * Manually flush the sessions every so often. If HALF
921 * of the session lifetime has passed since we last
922 * flushed, then flush it again.
924 * FIXME: Also do it every N sessions?
926 if (inst->conf->session_cache_enable &&
927 ((inst->conf->session_last_flushed + (inst->conf->session_timeout * 1800)) <= request->timestamp)) {
928 RDEBUG2("Flushing SSL sessions (of #%ld)",
929 SSL_CTX_sess_number(inst->ctx));
931 SSL_CTX_flush_sessions(inst->ctx, request->timestamp);
932 inst->conf->session_last_flushed = request->timestamp;
936 * If we're TTLS or PEAP, then do NOT require a client
939 * FIXME: This should be more configurable.
941 if (handler->eap_type != PW_EAP_TLS) {
942 vp = pairfind(handler->request->config_items,
943 PW_EAP_TLS_REQUIRE_CLIENT_CERT, 0);
947 client_cert = vp->vp_integer;
952 * Every new session is started only from EAP-TLS-START.
953 * Before Sending EAP-TLS-START, open a new SSL session.
954 * Create all the required data structures & store them
955 * in Opaque. So that we can use these data structures
956 * when we get the response
958 ssn = eaptls_new_session(inst->ctx, client_cert);
964 * Verify the peer certificate, if asked.
967 RDEBUG2("Requiring client certificate");
968 verify_mode = SSL_VERIFY_PEER;
969 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
970 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
972 SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
975 * Create a structure for all the items required to be
976 * verified for each client and set that as opaque data
979 * NOTE: If we want to set each item sepearately then
980 * this index should be global.
982 SSL_set_ex_data(ssn->ssl, 0, (void *)handler);
983 SSL_set_ex_data(ssn->ssl, 1, (void *)inst->conf);
985 ssn->length_flag = inst->conf->include_length;
988 * We use default fragment size, unless the Framed-MTU
989 * tells us it's too big. Note that we do NOT account
990 * for the EAP-TLS headers if conf->fragment_size is
991 * large, because that config item looks to be confusing.
993 * i.e. it should REALLY be called MTU, and the code here
994 * should figure out what that means for TLS fragment size.
995 * asking the administrator to know the internal details
996 * of EAP-TLS in order to calculate fragment sizes is
999 ssn->offset = inst->conf->fragment_size;
1000 vp = pairfind(handler->request->packet->vps, PW_FRAMED_MTU, 0);
1001 if (vp && ((vp->vp_integer - 14) < ssn->offset)) {
1003 * Discount the Framed-MTU by:
1005 * 4 : EAP header (code + id + length)
1006 * 1 : EAP type == EAP-TLS
1008 * 4 : EAP-TLS Message length
1009 * (even if conf->include_length == 0,
1014 ssn->offset = vp->vp_integer - 14;
1017 handler->opaque = ((void *)ssn);
1018 handler->free_opaque = session_free;
1020 RDEBUG2("Initiate");
1023 * Set up type-specific information.
1025 switch (handler->eap_type) {
1028 ssn->prf_label = "client EAP encryption";
1032 ssn->prf_label = "ttls keying material";
1036 * PEAP-specific breakage.
1040 * As it is a poorly designed protocol, PEAP uses
1041 * bits in the TLS header to indicate PEAP
1042 * version numbers. For now, we only support
1043 * PEAP version 0, so it doesn't matter too much.
1044 * However, if we support later versions of PEAP,
1045 * we will need this flag to indicate which
1046 * version we're currently dealing with.
1048 ssn->peap_flag = 0x00;
1051 * PEAP version 0 requires 'include_length = no',
1052 * so rather than hoping the user figures it out,
1055 ssn->length_flag = 0;
1057 ssn->prf_label = "client EAP encryption";
1061 if (inst->conf->session_cache_enable) {
1062 ssn->allow_session_resumption = 1; /* otherwise it's zero */
1066 * TLS session initialization is over. Now handle TLS
1067 * related handshaking or application data.
1069 status = eaptls_start(handler->eap_ds, ssn->peap_flag);
1070 RDEBUG2("Start returned %d", status);
1075 * The next stage to process the packet.
1077 handler->stage = AUTHENTICATE;
1083 * Do authentication, by letting EAP-TLS do most of the work.
1085 static int eaptls_authenticate(void *arg, EAP_HANDLER *handler)
1087 eaptls_status_t status;
1088 tls_session_t *tls_session = (tls_session_t *) handler->opaque;
1089 REQUEST *request = handler->request;
1090 eap_tls_t *inst = (eap_tls_t *) arg;
1092 RDEBUG2("Authenticate");
1094 status = eaptls_process(handler);
1095 RDEBUG2("eaptls_process returned %d\n", status);
1098 * EAP-TLS handshake was successful, return an
1099 * EAP-TLS-Success packet here.
1101 case EAPTLS_SUCCESS:
1105 * The TLS code is still working on the TLS
1106 * exchange, and it's a valid TLS request.
1109 case EAPTLS_HANDLED:
1113 * Handshake is done, proceed with decoding tunneled
1117 RDEBUG2("Received unexpected tunneled data after successful handshake.");
1119 if ((debug_flag > 2) && fr_log_fp) {
1121 unsigned int data_len;
1122 unsigned char buffer[1024];
1124 data_len = (tls_session->record_minus)(&tls_session->dirty_in,
1125 buffer, sizeof(buffer));
1126 log_debug(" Tunneled data (%u bytes)\n", data_len);
1127 for (i = 0; i < data_len; i++) {
1128 if ((i & 0x0f) == 0x00) fprintf(fr_log_fp, " %x: ", i);
1129 if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
1131 fprintf(fr_log_fp, "%02x ", buffer[i]);
1133 fprintf(fr_log_fp, "\n");
1137 eaptls_fail(handler, 0);
1142 * Anything else: fail.
1144 * Also, remove the session from the cache so that
1145 * the client can't re-use it.
1148 if (inst->conf->session_cache_enable) {
1149 SSL_CTX_remove_session(inst->ctx,
1150 tls_session->ssl->session);
1157 * New sessions cause some additional information to be
1160 if (!SSL_session_reused(tls_session->ssl)) {
1162 * FIXME: Store miscellaneous data.
1164 RDEBUG2("Adding user data to cached session");
1167 SSL_SESSION_set_ex_data(tls_session->ssl->session,
1168 ssl_session_idx_user_session, session_data);
1172 * FIXME: Retrieve miscellaneous data.
1175 data = SSL_SESSION_get_ex_data(tls_session->ssl->session,
1176 ssl_session_idx_user_session);
1178 if (!session_data) {
1179 radlog_request(L_ERR, 0, request,
1180 "No user session data in cached session - "
1186 RDEBUG2("Retrieved session data from cached session");
1190 * Success: Automatically return MPPE keys.
1192 return eaptls_success(handler, 0);
1196 * The module name should be the only globally exported symbol.
1197 * That is, everything else should be 'static'.
1199 EAP_TYPE rlm_eap_tls = {
1201 eaptls_attach, /* attach */
1202 eaptls_initiate, /* Start the initial request */
1203 NULL, /* authorization */
1204 eaptls_authenticate, /* authentication */
1205 eaptls_detach /* detach */