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 #ifdef HAVE_OPENSSL_OCSP_H
47 #include <openssl/ocsp.h>
50 static CONF_PARSER cache_config[] = {
51 { "enable", PW_TYPE_BOOLEAN,
52 offsetof(EAP_TLS_CONF, session_cache_enable), NULL, "no" },
53 { "lifetime", PW_TYPE_INTEGER,
54 offsetof(EAP_TLS_CONF, session_timeout), NULL, "24" },
55 { "max_entries", PW_TYPE_INTEGER,
56 offsetof(EAP_TLS_CONF, session_cache_size), NULL, "255" },
57 { "name", PW_TYPE_STRING_PTR,
58 offsetof(EAP_TLS_CONF, session_id_name), NULL, NULL},
59 { NULL, -1, 0, NULL, NULL } /* end the list */
62 static CONF_PARSER verify_config[] = {
63 { "tmpdir", PW_TYPE_STRING_PTR,
64 offsetof(EAP_TLS_CONF, verify_tmp_dir), NULL, NULL},
65 { "client", PW_TYPE_STRING_PTR,
66 offsetof(EAP_TLS_CONF, verify_client_cert_cmd), NULL, NULL},
67 { NULL, -1, 0, NULL, NULL } /* end the list */
70 #ifdef HAVE_OPENSSL_OCSP_H
71 static CONF_PARSER ocsp_config[] = {
72 { "override_cert_url", PW_TYPE_BOOLEAN,
73 offsetof(EAP_TLS_CONF, ocsp_override_url), NULL, "no"},
74 { "url", PW_TYPE_STRING_PTR,
75 offsetof(EAP_TLS_CONF, ocsp_url), NULL, NULL },
76 { NULL, -1, 0, NULL, NULL } /* end the list */
80 static CONF_PARSER module_config[] = {
81 { "rsa_key_exchange", PW_TYPE_BOOLEAN,
82 offsetof(EAP_TLS_CONF, rsa_key), NULL, "no" },
83 { "dh_key_exchange", PW_TYPE_BOOLEAN,
84 offsetof(EAP_TLS_CONF, dh_key), NULL, "yes" },
85 { "rsa_key_length", PW_TYPE_INTEGER,
86 offsetof(EAP_TLS_CONF, rsa_key_length), NULL, "512" },
87 { "dh_key_length", PW_TYPE_INTEGER,
88 offsetof(EAP_TLS_CONF, dh_key_length), NULL, "512" },
89 { "verify_depth", PW_TYPE_INTEGER,
90 offsetof(EAP_TLS_CONF, verify_depth), NULL, "0" },
91 { "CA_path", PW_TYPE_FILENAME,
92 offsetof(EAP_TLS_CONF, ca_path), NULL, NULL },
93 { "pem_file_type", PW_TYPE_BOOLEAN,
94 offsetof(EAP_TLS_CONF, file_type), NULL, "yes" },
95 { "private_key_file", PW_TYPE_FILENAME,
96 offsetof(EAP_TLS_CONF, private_key_file), NULL, NULL },
97 { "certificate_file", PW_TYPE_FILENAME,
98 offsetof(EAP_TLS_CONF, certificate_file), NULL, NULL },
99 { "CA_file", PW_TYPE_FILENAME,
100 offsetof(EAP_TLS_CONF, ca_file), NULL, NULL },
101 { "private_key_password", PW_TYPE_STRING_PTR,
102 offsetof(EAP_TLS_CONF, private_key_password), NULL, NULL },
103 { "dh_file", PW_TYPE_STRING_PTR,
104 offsetof(EAP_TLS_CONF, dh_file), NULL, NULL },
105 { "random_file", PW_TYPE_STRING_PTR,
106 offsetof(EAP_TLS_CONF, random_file), NULL, NULL },
107 { "fragment_size", PW_TYPE_INTEGER,
108 offsetof(EAP_TLS_CONF, fragment_size), NULL, "1024" },
109 { "include_length", PW_TYPE_BOOLEAN,
110 offsetof(EAP_TLS_CONF, include_length), NULL, "yes" },
111 { "check_crl", PW_TYPE_BOOLEAN,
112 offsetof(EAP_TLS_CONF, check_crl), NULL, "no"},
113 { "check_cert_cn", PW_TYPE_STRING_PTR,
114 offsetof(EAP_TLS_CONF, check_cert_cn), NULL, NULL},
115 { "cipher_list", PW_TYPE_STRING_PTR,
116 offsetof(EAP_TLS_CONF, cipher_list), NULL, NULL},
117 { "check_cert_issuer", PW_TYPE_STRING_PTR,
118 offsetof(EAP_TLS_CONF, check_cert_issuer), NULL, NULL},
119 { "make_cert_command", PW_TYPE_STRING_PTR,
120 offsetof(EAP_TLS_CONF, make_cert_command), NULL, NULL},
122 { "cache", PW_TYPE_SUBSECTION, 0, NULL, (const void *) cache_config },
124 { "verify", PW_TYPE_SUBSECTION, 0, NULL, (const void *) verify_config },
126 #ifdef HAVE_OPENSSL_OCSP_H
127 { "ocsp", PW_TYPE_SUBSECTION, 0, NULL, (const void *) ocsp_config },
130 { NULL, -1, 0, NULL, NULL } /* end the list */
135 * TODO: Check for the type of key exchange * like conf->dh_key
137 static int load_dh_params(SSL_CTX *ctx, char *file)
142 if ((bio = BIO_new_file(file, "r")) == NULL) {
143 radlog(L_ERR, "rlm_eap_tls: Unable to open DH file - %s", file);
147 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL);
150 DEBUG2("WARNING: rlm_eap_tls: Unable to set DH parameters. DH cipher suites may not work!");
151 DEBUG2("WARNING: Fix this by running the OpenSSL command listed in eap.conf");
155 if (SSL_CTX_set_tmp_dh(ctx, dh) < 0) {
156 radlog(L_ERR, "rlm_eap_tls: Unable to set DH parameters");
167 * Generate ephemeral RSA keys.
169 static int generate_eph_rsa_key(SSL_CTX *ctx)
173 rsa = RSA_generate_key(512, RSA_F4, NULL, NULL);
175 if (!SSL_CTX_set_tmp_rsa(ctx, rsa)) {
176 radlog(L_ERR, "rlm_eap_tls: Couldn't set ephemeral RSA key");
186 * These functions don't do anything other than print debugging
189 * FIXME: Write sessions to some long-term storage, so that
190 * session resumption can still occur after the server
193 #define MAX_SESSION_SIZE (256)
195 static void cbtls_remove_session(UNUSED SSL_CTX *ctx, SSL_SESSION *sess)
198 char buffer[2 * MAX_SESSION_SIZE + 1];
200 size = sess->session_id_length;
201 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
203 fr_bin2hex(sess->session_id, buffer, size);
205 DEBUG2(" SSL: Removing session %s from the cache", buffer);
206 SSL_SESSION_free(sess);
211 static int cbtls_new_session(UNUSED SSL *s, SSL_SESSION *sess)
214 char buffer[2 * MAX_SESSION_SIZE + 1];
216 size = sess->session_id_length;
217 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
219 fr_bin2hex(sess->session_id, buffer, size);
221 DEBUG2(" SSL: adding session %s to cache", buffer);
226 static SSL_SESSION *cbtls_get_session(UNUSED SSL *s,
227 unsigned char *data, int len,
231 char buffer[2 * MAX_SESSION_SIZE + 1];
234 if (size > MAX_SESSION_SIZE) size = MAX_SESSION_SIZE;
236 fr_bin2hex(data, buffer, size);
238 DEBUG2(" SSL: Client requested nonexistent cached session %s",
244 #ifdef HAVE_OPENSSL_OCSP_H
246 * This function extracts the OCSP Responder URL
247 * from an existing x509 certificate.
249 static int ocsp_parse_cert_url(X509 *cert, char **phost, char **pport,
250 char **ppath, int *pssl)
254 AUTHORITY_INFO_ACCESS *aia;
255 ACCESS_DESCRIPTION *ad;
257 aia = X509_get_ext_d2i(cert, NID_info_access, NULL, NULL);
259 for (i = 0; i < sk_ACCESS_DESCRIPTION_num(aia); i++) {
260 ad = sk_ACCESS_DESCRIPTION_value(aia, 0);
261 if (OBJ_obj2nid(ad->method) == NID_ad_OCSP) {
262 if (ad->location->type == GEN_URI) {
263 if(OCSP_parse_url(ad->location->d.ia5->data,
264 phost, pport, ppath, pssl))
273 * This function sends a OCSP request to a defined OCSP responder
274 * and checks the OCSP response for correctness.
276 static int ocsp_check(X509_STORE *store, X509 *issuer_cert, X509 *client_cert,
282 OCSP_BASICRESP *bresp = NULL;
292 * Create OCSP Request
294 certid = OCSP_cert_to_id(NULL, client_cert, issuer_cert);
295 req = OCSP_REQUEST_new();
296 OCSP_request_add0_id(req, certid);
297 OCSP_request_add1_nonce(req, NULL, 8);
300 * Send OCSP Request and get OCSP Response
303 /* Get OCSP responder URL */
304 if(conf->ocsp_override_url) {
305 OCSP_parse_url(conf->ocsp_url, &host, &port, &path, &use_ssl);
308 ocsp_parse_cert_url(client_cert, &host, &port, &path, &use_ssl);
311 DEBUG2("[ocsp] --> Responder URL = http://%s:%s%s", host, port, path);
313 /* Setup BIO socket to OCSP responder */
314 cbio = BIO_new_connect(host);
315 BIO_set_conn_port(cbio, port);
316 BIO_do_connect(cbio);
318 /* Send OCSP request and wait for response */
319 resp = OCSP_sendreq_bio(cbio, path, req);
321 radlog(L_ERR, "Error: Couldn't get OCSP response");
326 /* Verify OCSP response */
327 status = OCSP_response_status(resp);
328 if(status != OCSP_RESPONSE_STATUS_SUCCESSFUL) {
329 radlog(L_ERR, "Error: OCSP response status: %s", OCSP_response_status_str(status));
333 bresp = OCSP_response_get1_basic(resp);
334 if(OCSP_check_nonce(req, bresp)!=1) {
335 radlog(L_ERR, "Error: OCSP response has wrong nonce value");
339 if(OCSP_basic_verify(bresp, NULL, store, 0)!=1){
340 radlog(L_ERR, "Error: Couldn't verify OCSP basic response");
348 /* Free OCSP Stuff */
349 OCSP_REQUEST_free(req);
350 OCSP_RESPONSE_free(resp);
355 OCSP_BASICRESP_free(bresp);
358 DEBUG2("[ocsp] --> Certificate is valid!");
360 DEBUG2("[ocsp] --> Certificate has been expired/revoked!");
364 #endif /* HAVE_OPENSSL_OCSP_H */
367 * For creating certificate attributes.
369 static const char *cert_attr_names[5][2] = {
370 { "TLS-Client-Cert-Serial", "TLS-Cert-Serial" },
371 { "TLS-Client-Cert-Expiration", "TLS-Cert-Expiration" },
372 { "TLS-Client-Cert-Subject", "TLS-Cert-Subject" },
373 { "TLS-Client-Cert-Issuer", "TLS-Cert-Issuer" },
374 { "TLS-Client-Cert-Common-Name", "TLS-Cert-Common-Name" }
377 #define EAPTLS_SERIAL (0)
378 #define EAPTLS_EXPIRATION (1)
379 #define EAPTLS_SUBJECT (2)
380 #define EAPTLS_ISSUER (3)
381 #define EAPTLS_CN (4)
384 * Before trusting a certificate, you must make sure that the
385 * certificate is 'valid'. There are several steps that your
386 * application can take in determining if a certificate is
387 * valid. Commonly used steps are:
389 * 1.Verifying the certificate's signature, and verifying that
390 * the certificate has been issued by a trusted Certificate
393 * 2.Verifying that the certificate is valid for the present date
394 * (i.e. it is being presented within its validity dates).
396 * 3.Verifying that the certificate has not been revoked by its
397 * issuing Certificate Authority, by checking with respect to a
398 * Certificate Revocation List (CRL).
400 * 4.Verifying that the credentials presented by the certificate
401 * fulfill additional requirements specific to the application,
402 * such as with respect to access control lists or with respect
403 * to OCSP (Online Certificate Status Processing).
405 * NOTE: This callback will be called multiple times based on the
406 * depth of the root certificate chain
408 static int cbtls_verify(int ok, X509_STORE_CTX *ctx)
410 char subject[1024]; /* Used for the subject name */
411 char issuer[1024]; /* Used for the issuer name */
412 char common_name[1024];
415 EAP_HANDLER *handler = NULL;
419 int err, depth, lookup;
423 ASN1_INTEGER *sn = NULL;
424 ASN1_TIME *asn_time = NULL;
425 #ifdef HAVE_OPENSSL_OCSP_H
426 X509_STORE *ocsp_store = NULL;
429 client_cert = X509_STORE_CTX_get_current_cert(ctx);
430 err = X509_STORE_CTX_get_error(ctx);
431 depth = X509_STORE_CTX_get_error_depth(ctx);
436 * Log client/issuing cert. If there's an error, log
439 if ((lookup > 1) && !my_ok) lookup = 1;
442 * Retrieve the pointer to the SSL of the connection currently treated
443 * and the application specific data stored into the SSL object.
445 ssl = X509_STORE_CTX_get_ex_data(ctx, SSL_get_ex_data_X509_STORE_CTX_idx());
446 handler = (EAP_HANDLER *)SSL_get_ex_data(ssl, 0);
447 request = handler->request;
448 conf = (EAP_TLS_CONF *)SSL_get_ex_data(ssl, 1);
449 #ifdef HAVE_OPENSSL_OCSP_H
450 ocsp_store = (X509_STORE *)SSL_get_ex_data(ssl, 2);
455 * Get the Serial Number
458 sn = X509_get_serialNumber(client_cert);
461 * For this next bit, we create the attributes *only* if
462 * we're at the client or issuing certificate.
464 if ((lookup <= 1) && sn && (sn->length < (sizeof(buf) / 2))) {
468 for (i = 0; i < sn->length; i++) {
469 sprintf(p, "%02x", (unsigned int)sn->data[i]);
472 pairadd(&handler->certs,
473 pairmake(cert_attr_names[EAPTLS_SERIAL][lookup], buf, T_OP_SET));
478 * Get the Expiration Date
481 asn_time = X509_get_notAfter(client_cert);
482 if ((lookup <= 1) && asn_time && (asn_time->length < MAX_STRING_LEN)) {
483 memcpy(buf, (char*) asn_time->data, asn_time->length);
484 buf[asn_time->length] = '\0';
485 pairadd(&handler->certs,
486 pairmake(cert_attr_names[EAPTLS_EXPIRATION][lookup], buf, T_OP_SET));
490 * Get the Subject & Issuer
492 subject[0] = issuer[0] = '\0';
493 X509_NAME_oneline(X509_get_subject_name(client_cert), subject,
495 subject[sizeof(subject) - 1] = '\0';
496 if ((lookup <= 1) && subject[0] && (strlen(subject) < MAX_STRING_LEN)) {
497 pairadd(&handler->certs,
498 pairmake(cert_attr_names[EAPTLS_SUBJECT][lookup], subject, T_OP_SET));
501 X509_NAME_oneline(X509_get_issuer_name(ctx->current_cert), issuer,
503 issuer[sizeof(issuer) - 1] = '\0';
504 if ((lookup <= 1) && issuer[0] && (strlen(issuer) < MAX_STRING_LEN)) {
505 pairadd(&handler->certs,
506 pairmake(cert_attr_names[EAPTLS_ISSUER][lookup], issuer, T_OP_SET));
510 * Get the Common Name
512 X509_NAME_get_text_by_NID(X509_get_subject_name(client_cert),
513 NID_commonName, common_name, sizeof(common_name));
514 common_name[sizeof(common_name) - 1] = '\0';
515 if ((lookup <= 1) && common_name[0] && (strlen(common_name) < MAX_STRING_LEN)) {
516 pairadd(&handler->certs,
517 pairmake(cert_attr_names[EAPTLS_CN][lookup], common_name, T_OP_SET));
521 const char *p = X509_verify_cert_error_string(err);
522 radlog(L_ERR,"--> verify error:num=%d:%s\n",err, p);
523 radius_pairmake(request, &request->packet->vps,
524 "Module-Failure-Message", p, T_OP_SET);
528 switch (ctx->error) {
530 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
531 radlog(L_ERR, "issuer= %s\n", issuer);
533 case X509_V_ERR_CERT_NOT_YET_VALID:
534 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
535 radlog(L_ERR, "notBefore=");
537 ASN1_TIME_print(bio_err, X509_get_notBefore(ctx->current_cert));
540 case X509_V_ERR_CERT_HAS_EXPIRED:
541 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
542 radlog(L_ERR, "notAfter=");
544 ASN1_TIME_print(bio_err, X509_get_notAfter(ctx->current_cert));
550 * If we're at the actual client cert, apply additional
555 * If the conf tells us to, check cert issuer
556 * against the specified value and fail
557 * verification if they don't match.
559 if (conf->check_cert_issuer &&
560 (strcmp(issuer, conf->check_cert_issuer) != 0)) {
561 radlog(L_AUTH, "rlm_eap_tls: Certificate issuer (%s) does not match specified value (%s)!", issuer, conf->check_cert_issuer);
566 * If the conf tells us to, check the CN in the
567 * cert against xlat'ed value, but only if the
568 * previous checks passed.
570 if (my_ok && conf->check_cert_cn) {
571 if (!radius_xlat(cn_str, sizeof(cn_str), conf->check_cert_cn, handler->request, NULL)) {
572 radlog(L_ERR, "rlm_eap_tls (%s): xlat failed.",
573 conf->check_cert_cn);
574 /* if this fails, fail the verification */
577 RDEBUG2("checking certificate CN (%s) with xlat'ed value (%s)", common_name, cn_str);
578 if (strcmp(cn_str, common_name) != 0) {
579 radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) does not match specified value (%s)!", common_name, cn_str);
583 } /* check_cert_cn */
585 #ifdef HAVE_OPENSSL_OCSP_H
586 if (my_ok && conf->check_ocsp){
587 RDEBUG2("--> Starting OCSP Request");
588 if(X509_STORE_CTX_get1_issuer(&issuer_cert, ctx, client_cert)!=1) {
589 radlog(L_ERR, "Error: Couldn't get issuer_cert for %s", common_name);
591 my_ok = ocsp_check(ocsp_store, issuer_cert, client_cert, conf);
595 while (conf->verify_client_cert_cmd) {
599 snprintf(filename, sizeof(filename), "%s/%s.client.XXXXXXXX",
600 conf->verify_tmp_dir, progname);
601 if (mkstemp(filename) < 0) {
602 RDEBUG("Failed creating file in %s: %s",
603 conf->verify_tmp_dir, strerror(errno));
607 fp = fopen(filename, "w");
609 RDEBUG("Failed opening file %s: %s",
610 filename, strerror(errno));
614 if (!PEM_write_X509(fp, client_cert)) {
616 RDEBUG("Failed writing certificate to file");
621 if (!radius_pairmake(request, &request->packet->vps,
622 "TLS-Client-Cert-Filename",
623 filename, T_OP_SET)) {
624 RDEBUG("Failed creating TLS-Client-Cert-Filename");
629 RDEBUG("Verifying client certificate: %s",
630 conf->verify_client_cert_cmd);
631 if (radius_exec_program(conf->verify_client_cert_cmd,
633 request->packet->vps,
635 radlog(L_AUTH, "rlm_eap_tls: Certificate CN (%s) fails external verification!", common_name);
638 RDEBUG("Client certificate CN %s passed external validation", common_name);
649 if (debug_flag > 0) {
650 RDEBUG2("chain-depth=%d, ", depth);
651 RDEBUG2("error=%d", err);
653 RDEBUG2("--> User-Name = %s", handler->identity);
654 RDEBUG2("--> BUF-Name = %s", common_name);
655 RDEBUG2("--> subject = %s", subject);
656 RDEBUG2("--> issuer = %s", issuer);
657 RDEBUG2("--> verify return:%d", my_ok);
664 * Free cached session data, which is always a list of VALUE_PAIRs
666 static void eaptls_session_free(UNUSED void *parent, void *data_ptr,
667 UNUSED CRYPTO_EX_DATA *ad, UNUSED int idx,
668 UNUSED long argl, UNUSED void *argp)
670 VALUE_PAIR *vp = data_ptr;
671 if (!data_ptr) return;
676 #ifdef HAVE_OPENSSL_OCSP_H
678 * Create Global X509 revocation store and use it to verify
681 * - Load the trusted CAs
682 * - Load the trusted issuer certificates
684 static X509_STORE *init_revocation_store(EAP_TLS_CONF *conf)
686 X509_STORE *store = NULL;
688 store = X509_STORE_new();
690 /* Load the CAs we trust */
691 if (conf->ca_file || conf->ca_path)
692 if(!X509_STORE_load_locations(store, conf->ca_file, conf->ca_path)) {
693 radlog(L_ERR, "rlm_eap: X509_STORE error %s", ERR_error_string(ERR_get_error(), NULL));
694 radlog(L_ERR, "rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
698 #ifdef X509_V_FLAG_CRL_CHECK
700 X509_STORE_set_flags(store, X509_V_FLAG_CRL_CHECK);
704 #endif /* HAVE_OPENSSL_OCSP_H */
707 * Create Global context SSL and use it in every new session
709 * - Load the trusted CAs
710 * - Load the Private key & the certificate
711 * - Set the Context options & Verify options
713 static SSL_CTX *init_tls_ctx(EAP_TLS_CONF *conf)
717 X509_STORE *certstore;
718 int verify_mode = SSL_VERIFY_NONE;
723 * Add all the default ciphers and message digests
724 * Create our context.
727 SSL_load_error_strings();
730 * SHA256 is in all versions of OpenSSL, but isn't
731 * initialized by default. It's needed for WiMAX
734 #ifdef HAVE_OPENSSL_EVP_SHA256
735 EVP_add_digest(EVP_sha256());
738 meth = TLSv1_method();
739 ctx = SSL_CTX_new(meth);
742 * Identify the type of certificates that needs to be loaded
744 if (conf->file_type) {
745 type = SSL_FILETYPE_PEM;
747 type = SSL_FILETYPE_ASN1;
751 * Set the password to load private key
753 if (conf->private_key_password) {
756 * We don't want to put the private key password in eap.conf, so check
757 * for our special string which indicates we should get the password
760 const char* special_string = "Apple:UseCertAdmin";
761 if (strncmp(conf->private_key_password,
763 strlen(special_string)) == 0)
766 const long max_password_len = 128;
767 snprintf(cmd, sizeof(cmd) - 1,
768 "/usr/sbin/certadmin --get-private-key-passphrase \"%s\"",
769 conf->private_key_file);
771 DEBUG2("rlm_eap: Getting private key passphrase using command \"%s\"", cmd);
773 FILE* cmd_pipe = popen(cmd, "r");
775 radlog(L_ERR, "rlm_eap: %s command failed. Unable to get private_key_password", cmd);
776 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
780 free(conf->private_key_password);
781 conf->private_key_password = malloc(max_password_len * sizeof(char));
782 if (!conf->private_key_password) {
783 radlog(L_ERR, "rlm_eap: Can't malloc space for private_key_password");
784 radlog(L_ERR, "rlm_eap: Error reading private_key_file %s", conf->private_key_file);
789 fgets(conf->private_key_password, max_password_len, cmd_pipe);
792 /* Get rid of newline at end of password. */
793 conf->private_key_password[strlen(conf->private_key_password) - 1] = '\0';
794 DEBUG2("rlm_eap: Password from command = \"%s\"", conf->private_key_password);
797 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->private_key_password);
798 SSL_CTX_set_default_passwd_cb(ctx, cbtls_password);
802 * Load our keys and certificates
804 * If certificates are of type PEM then we can make use
805 * of cert chain authentication using openssl api call
806 * SSL_CTX_use_certificate_chain_file. Please see how
807 * the cert chain needs to be given in PEM from
810 if (type == SSL_FILETYPE_PEM) {
811 if (!(SSL_CTX_use_certificate_chain_file(ctx, conf->certificate_file))) {
812 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
813 radlog(L_ERR, "rlm_eap_tls: Error reading certificate file %s", conf->certificate_file);
817 } else if (!(SSL_CTX_use_certificate_file(ctx, conf->certificate_file, type))) {
818 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
819 radlog(L_ERR, "rlm_eap_tls: Error reading certificate file %s", conf->certificate_file);
823 /* Load the CAs we trust */
824 if (conf->ca_file || conf->ca_path) {
825 if (!SSL_CTX_load_verify_locations(ctx, conf->ca_file, conf->ca_path)) {
826 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
827 radlog(L_ERR, "rlm_eap_tls: Error reading Trusted root CA list %s",conf->ca_file );
831 if (conf->ca_file && *conf->ca_file) SSL_CTX_set_client_CA_list(ctx, SSL_load_client_CA_file(conf->ca_file));
832 if (!(SSL_CTX_use_PrivateKey_file(ctx, conf->private_key_file, type))) {
833 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
834 radlog(L_ERR, "rlm_eap_tls: Error reading private key file %s", conf->private_key_file);
839 * Check if the loaded private key is the right one
841 if (!SSL_CTX_check_private_key(ctx)) {
842 radlog(L_ERR, "rlm_eap_tls: Private key does not match the certificate public key");
849 ctx_options |= SSL_OP_NO_SSLv2;
850 ctx_options |= SSL_OP_NO_SSLv3;
851 #ifdef SSL_OP_NO_TICKET
852 ctx_options |= SSL_OP_NO_TICKET ;
856 * SSL_OP_SINGLE_DH_USE must be used in order to prevent
857 * small subgroup attacks and forward secrecy. Always
860 * SSL_OP_SINGLE_DH_USE has an impact on the computer
861 * time needed during negotiation, but it is not very
864 ctx_options |= SSL_OP_SINGLE_DH_USE;
867 * SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS to work around issues
868 * in Windows Vista client.
869 * http://www.openssl.org/~bodo/tls-cbc.txt
870 * http://www.nabble.com/(RADIATOR)-Radiator-Version-3.16-released-t2600070.html
872 ctx_options |= SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS;
874 SSL_CTX_set_options(ctx, ctx_options);
877 * TODO: Set the RSA & DH
878 * SSL_CTX_set_tmp_rsa_callback(ctx, cbtls_rsa);
879 * SSL_CTX_set_tmp_dh_callback(ctx, cbtls_dh);
883 * set the message callback to identify the type of
884 * message. For every new session, there can be a
885 * different callback argument.
887 * SSL_CTX_set_msg_callback(ctx, cbtls_msg);
890 /* Set Info callback */
891 SSL_CTX_set_info_callback(ctx, cbtls_info);
894 * Callbacks, etc. for session resumption.
896 if (conf->session_cache_enable) {
897 SSL_CTX_sess_set_new_cb(ctx, cbtls_new_session);
898 SSL_CTX_sess_set_get_cb(ctx, cbtls_get_session);
899 SSL_CTX_sess_set_remove_cb(ctx, cbtls_remove_session);
901 SSL_CTX_set_quiet_shutdown(ctx, 1);
905 * Check the certificates for revocation.
907 #ifdef X509_V_FLAG_CRL_CHECK
908 if (conf->check_crl) {
909 certstore = SSL_CTX_get_cert_store(ctx);
910 if (certstore == NULL) {
911 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
912 radlog(L_ERR, "rlm_eap_tls: Error reading Certificate Store");
915 X509_STORE_set_flags(certstore, X509_V_FLAG_CRL_CHECK);
921 * Always verify the peer certificate
923 verify_mode |= SSL_VERIFY_PEER;
924 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
925 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
926 SSL_CTX_set_verify(ctx, verify_mode, cbtls_verify);
928 if (conf->verify_depth) {
929 SSL_CTX_set_verify_depth(ctx, conf->verify_depth);
932 /* Load randomness */
933 if (!(RAND_load_file(conf->random_file, 1024*1024))) {
934 radlog(L_ERR, "rlm_eap: SSL error %s", ERR_error_string(ERR_get_error(), NULL));
935 radlog(L_ERR, "rlm_eap_tls: Error loading randomness");
940 * Set the cipher list if we were told to
942 if (conf->cipher_list) {
943 if (!SSL_CTX_set_cipher_list(ctx, conf->cipher_list)) {
944 radlog(L_ERR, "rlm_eap_tls: Error setting cipher list");
950 * Setup session caching
952 if (conf->session_cache_enable) {
954 * Create a unique context Id per EAP-TLS configuration.
956 if (conf->session_id_name) {
957 snprintf(conf->session_context_id,
958 sizeof(conf->session_context_id),
959 "FreeRADIUS EAP-TLS %s",
960 conf->session_id_name);
962 snprintf(conf->session_context_id,
963 sizeof(conf->session_context_id),
964 "FreeRADIUS EAP-TLS %p", conf);
968 * Cache it, and DON'T auto-clear it.
970 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_SERVER | SSL_SESS_CACHE_NO_AUTO_CLEAR);
972 SSL_CTX_set_session_id_context(ctx,
973 (unsigned char *) conf->session_context_id,
974 (unsigned int) strlen(conf->session_context_id));
977 * Our timeout is in hours, this is in seconds.
979 SSL_CTX_set_timeout(ctx, conf->session_timeout * 3600);
982 * Set the maximum number of entries in the
985 SSL_CTX_sess_set_cache_size(ctx, conf->session_cache_size);
988 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
992 * Register the application indices. We can't use
993 * hard-coded "0" and "1" as before, because we need to
994 * set up a "free" handler for the cached session
997 if (eaptls_handle_idx < 0) {
998 eaptls_handle_idx = SSL_get_ex_new_index(0, &eaptls_handle_idx,
1002 if (eaptls_conf_idx < 0) {
1003 eaptls_conf_idx = SSL_get_ex_new_index(0, &eaptls_conf_idx,
1007 if (eaptls_store_idx < 0) {
1008 eaptls_store_idx = SSL_get_ex_new_index(0, "eaptls_store_idx",
1012 if (eaptls_session_idx < 0) {
1013 eaptls_session_idx = SSL_get_ex_new_index(0, &eaptls_session_idx,
1015 eaptls_session_free);
1023 * Detach the EAP-TLS module.
1025 static int eaptls_detach(void *arg)
1030 inst = (eap_tls_t *) arg;
1034 memset(conf, 0, sizeof(*conf));
1039 if (inst->ctx) SSL_CTX_free(inst->ctx);
1042 if (inst->store) X509_STORE_free(inst->store);
1052 * Attach the EAP-TLS module.
1054 static int eaptls_attach(CONF_SECTION *cs, void **instance)
1059 /* Store all these values in the data structure for later references */
1060 inst = (eap_tls_t *)malloc(sizeof(*inst));
1062 radlog(L_ERR, "rlm_eap_tls: out of memory");
1065 memset(inst, 0, sizeof(*inst));
1068 * Parse the config file & get all the configured values
1070 conf = (EAP_TLS_CONF *)malloc(sizeof(*conf));
1073 radlog(L_ERR, "rlm_eap_tls: out of memory");
1076 memset(conf, 0, sizeof(*conf));
1079 if (cf_section_parse(cs, conf, module_config) < 0) {
1080 eaptls_detach(inst);
1085 * The EAP RFC's say 1020, but we're less picky.
1087 if (conf->fragment_size < 100) {
1088 radlog(L_ERR, "rlm_eap_tls: Fragment size is too small.");
1089 eaptls_detach(inst);
1094 * The maximum size for a RADIUS packet is 4096,
1095 * minus the header (20), Message-Authenticator (18),
1096 * and State (18), etc. results in about 4000 bytes of data
1097 * that can be devoted *solely* to EAP.
1099 if (conf->fragment_size > 4000) {
1100 radlog(L_ERR, "rlm_eap_tls: Fragment size is too large.");
1101 eaptls_detach(inst);
1106 * Account for the EAP header (4), and the EAP-TLS header
1107 * (6), as per Section 4.2 of RFC 2716. What's left is
1108 * the maximum amount of data we read from a TLS buffer.
1110 conf->fragment_size -= 10;
1113 * This magic makes the administrators life HUGELY easier
1114 * on initial deployments.
1116 * If the server starts up in debugging mode, AND the
1117 * bootstrap command is configured, AND it exists, AND
1118 * there is no server certificate
1120 if (conf->make_cert_command && (debug_flag >= 2)) {
1123 if ((stat(conf->make_cert_command, &buf) == 0) &&
1124 (stat(conf->certificate_file, &buf) < 0) &&
1125 (errno == ENOENT) &&
1126 (radius_exec_program(conf->make_cert_command, NULL, 1,
1127 NULL, 0, NULL, NULL, 0) != 0)) {
1128 eaptls_detach(inst);
1137 inst->ctx = init_tls_ctx(conf);
1138 if (inst->ctx == NULL) {
1139 eaptls_detach(inst);
1143 #ifdef HAVE_OPENSSL_OCSP_H
1145 * Initialize OCSP Revocation Store
1147 if (!conf->ocsp_url && !conf->ocsp_override_url) {
1148 conf->check_ocsp = FALSE;
1150 inst->store = init_revocation_store(conf);
1151 if (inst->store == NULL) {
1152 eaptls_detach(inst);
1156 #endif HAVE_OPENSSL_OCSP_H
1158 if (load_dh_params(inst->ctx, conf->dh_file) < 0) {
1159 eaptls_detach(inst);
1163 if (generate_eph_rsa_key(inst->ctx) < 0) {
1164 eaptls_detach(inst);
1168 if (conf->verify_tmp_dir) {
1169 if (chmod(conf->verify_tmp_dir, S_IRWXU) < 0) {
1170 radlog(L_ERR, "rlm_eap_tls: Failed changing permissions on %s: %s", conf->verify_tmp_dir, strerror(errno));
1171 eaptls_detach(inst);
1176 if (conf->verify_client_cert_cmd && !conf->verify_tmp_dir) {
1177 radlog(L_ERR, "rlm_eap_tls: You MUST set the verify directory in order to use verify_client_cmd");
1178 eaptls_detach(inst);
1189 * Send an initial eap-tls request to the peer.
1191 * Frame eap reply packet.
1192 * len = header + type + tls_typedata
1193 * tls_typedata = flags(Start (S) bit set, and no data)
1195 * Once having received the peer's Identity, the EAP server MUST
1196 * respond with an EAP-TLS/Start packet, which is an
1197 * EAP-Request packet with EAP-Type=EAP-TLS, the Start (S) bit
1198 * set, and no data. The EAP-TLS conversation will then begin,
1199 * with the peer sending an EAP-Response packet with
1200 * EAP-Type = EAP-TLS. The data field of that packet will
1203 * Fragment length is Framed-MTU - 4.
1205 * http://mail.frascone.com/pipermail/public/eap/2003-July/001426.html
1207 static int eaptls_initiate(void *type_arg, EAP_HANDLER *handler)
1213 int client_cert = TRUE;
1214 int verify_mode = 0;
1215 REQUEST *request = handler->request;
1217 inst = (eap_tls_t *)type_arg;
1219 handler->tls = TRUE;
1220 handler->finished = FALSE;
1223 * Manually flush the sessions every so often. If HALF
1224 * of the session lifetime has passed since we last
1225 * flushed, then flush it again.
1227 * FIXME: Also do it every N sessions?
1229 if (inst->conf->session_cache_enable &&
1230 ((inst->conf->session_last_flushed + (inst->conf->session_timeout * 1800)) <= request->timestamp)) {
1231 RDEBUG2("Flushing SSL sessions (of #%ld)",
1232 SSL_CTX_sess_number(inst->ctx));
1234 SSL_CTX_flush_sessions(inst->ctx, request->timestamp);
1235 inst->conf->session_last_flushed = request->timestamp;
1239 * If we're TTLS or PEAP, then do NOT require a client
1242 * FIXME: This should be more configurable.
1244 if (handler->eap_type != PW_EAP_TLS) {
1245 vp = pairfind(handler->request->config_items,
1246 PW_EAP_TLS_REQUIRE_CLIENT_CERT, 0);
1248 client_cert = FALSE;
1250 client_cert = vp->vp_integer;
1255 * Every new session is started only from EAP-TLS-START.
1256 * Before Sending EAP-TLS-START, open a new SSL session.
1257 * Create all the required data structures & store them
1258 * in Opaque. So that we can use these data structures
1259 * when we get the response
1261 ssn = eaptls_new_session(inst->ctx, client_cert);
1267 * Verify the peer certificate, if asked.
1270 RDEBUG2("Requiring client certificate");
1271 verify_mode = SSL_VERIFY_PEER;
1272 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
1273 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
1275 SSL_set_verify(ssn->ssl, verify_mode, cbtls_verify);
1278 * Create a structure for all the items required to be
1279 * verified for each client and set that as opaque data
1282 * NOTE: If we want to set each item sepearately then
1283 * this index should be global.
1285 SSL_set_ex_data(ssn->ssl, 0, (void *)handler);
1286 SSL_set_ex_data(ssn->ssl, 1, (void *)inst->conf);
1287 SSL_set_ex_data(ssn->ssl, 2, (void *)inst->store);
1289 ssn->length_flag = inst->conf->include_length;
1292 * We use default fragment size, unless the Framed-MTU
1293 * tells us it's too big. Note that we do NOT account
1294 * for the EAP-TLS headers if conf->fragment_size is
1295 * large, because that config item looks to be confusing.
1297 * i.e. it should REALLY be called MTU, and the code here
1298 * should figure out what that means for TLS fragment size.
1299 * asking the administrator to know the internal details
1300 * of EAP-TLS in order to calculate fragment sizes is
1303 ssn->offset = inst->conf->fragment_size;
1304 vp = pairfind(handler->request->packet->vps, PW_FRAMED_MTU, 0);
1305 if (vp && ((vp->vp_integer - 14) < ssn->offset)) {
1307 * Discount the Framed-MTU by:
1309 * 4 : EAP header (code + id + length)
1310 * 1 : EAP type == EAP-TLS
1312 * 4 : EAP-TLS Message length
1313 * (even if conf->include_length == 0,
1318 ssn->offset = vp->vp_integer - 14;
1321 handler->opaque = ((void *)ssn);
1322 handler->free_opaque = session_free;
1324 RDEBUG2("Initiate");
1327 * Set up type-specific information.
1329 switch (handler->eap_type) {
1332 ssn->prf_label = "client EAP encryption";
1336 ssn->prf_label = "ttls keying material";
1340 * PEAP-specific breakage.
1344 * As it is a poorly designed protocol, PEAP uses
1345 * bits in the TLS header to indicate PEAP
1346 * version numbers. For now, we only support
1347 * PEAP version 0, so it doesn't matter too much.
1348 * However, if we support later versions of PEAP,
1349 * we will need this flag to indicate which
1350 * version we're currently dealing with.
1352 ssn->peap_flag = 0x00;
1355 * PEAP version 0 requires 'include_length = no',
1356 * so rather than hoping the user figures it out,
1359 ssn->length_flag = 0;
1361 ssn->prf_label = "client EAP encryption";
1365 if (inst->conf->session_cache_enable) {
1366 ssn->allow_session_resumption = 1; /* otherwise it's zero */
1370 * TLS session initialization is over. Now handle TLS
1371 * related handshaking or application data.
1373 status = eaptls_start(handler->eap_ds, ssn->peap_flag);
1374 RDEBUG2("Start returned %d", status);
1379 * The next stage to process the packet.
1381 handler->stage = AUTHENTICATE;
1387 * Do authentication, by letting EAP-TLS do most of the work.
1389 static int eaptls_authenticate(void *arg, EAP_HANDLER *handler)
1391 eaptls_status_t status;
1392 tls_session_t *tls_session = (tls_session_t *) handler->opaque;
1393 REQUEST *request = handler->request;
1394 eap_tls_t *inst = (eap_tls_t *) arg;
1396 RDEBUG2("Authenticate");
1398 status = eaptls_process(handler);
1399 RDEBUG2("eaptls_process returned %d\n", status);
1402 * EAP-TLS handshake was successful, return an
1403 * EAP-TLS-Success packet here.
1405 case EAPTLS_SUCCESS:
1409 * The TLS code is still working on the TLS
1410 * exchange, and it's a valid TLS request.
1413 case EAPTLS_HANDLED:
1417 * Handshake is done, proceed with decoding tunneled
1421 RDEBUG2("Received unexpected tunneled data after successful handshake.");
1423 if ((debug_flag > 2) && fr_log_fp) {
1425 unsigned int data_len;
1426 unsigned char buffer[1024];
1428 data_len = (tls_session->record_minus)(&tls_session->dirty_in,
1429 buffer, sizeof(buffer));
1430 log_debug(" Tunneled data (%u bytes)\n", data_len);
1431 for (i = 0; i < data_len; i++) {
1432 if ((i & 0x0f) == 0x00) fprintf(fr_log_fp, " %x: ", i);
1433 if ((i & 0x0f) == 0x0f) fprintf(fr_log_fp, "\n");
1435 fprintf(fr_log_fp, "%02x ", buffer[i]);
1437 fprintf(fr_log_fp, "\n");
1441 eaptls_fail(handler, 0);
1446 * Anything else: fail.
1448 * Also, remove the session from the cache so that
1449 * the client can't re-use it.
1452 if (inst->conf->session_cache_enable) {
1453 SSL_CTX_remove_session(inst->ctx,
1454 tls_session->ssl->session);
1461 * New sessions cause some additional information to be
1464 if (!SSL_session_reused(tls_session->ssl)) {
1466 * FIXME: Store miscellaneous data.
1468 RDEBUG2("Adding user data to cached session");
1471 SSL_SESSION_set_ex_data(tls_session->ssl->session,
1472 ssl_session_idx_user_session, session_data);
1476 * FIXME: Retrieve miscellaneous data.
1479 data = SSL_SESSION_get_ex_data(tls_session->ssl->session,
1480 ssl_session_idx_user_session);
1482 if (!session_data) {
1483 radlog_request(L_ERR, 0, request,
1484 "No user session data in cached session - "
1490 RDEBUG2("Retrieved session data from cached session");
1494 * Success: Automatically return MPPE keys.
1496 return eaptls_success(handler, 0);
1500 * The module name should be the only globally exported symbol.
1501 * That is, everything else should be 'static'.
1503 EAP_TYPE rlm_eap_tls = {
1505 eaptls_attach, /* attach */
1506 eaptls_initiate, /* Start the initial request */
1507 NULL, /* authorization */
1508 eaptls_authenticate, /* authentication */
1509 eaptls_detach /* detach */