2 * Copyright (C) 2006-2009 Stig Venaas <venaas@uninett.no>
3 * Copyright (C) 2010 NORDUnet A/S
5 * Permission to use, copy, modify, and distribute this software for any
6 * purpose with or without fee is hereby granted, provided that the above
7 * copyright notice and this permission notice appear in all copies.
10 #if defined(RADPROT_TLS) || defined(RADPROT_DTLS)
12 #include <sys/socket.h>
13 #include <netinet/in.h>
22 #include <sys/types.h>
23 #include <sys/select.h>
26 #include <arpa/inet.h>
30 #include <openssl/ssl.h>
31 #include <openssl/rand.h>
32 #include <openssl/err.h>
33 #include <openssl/md5.h>
34 #include <openssl/x509v3.h>
40 #include "radsecproxy.h"
42 static struct hash *tlsconfs = NULL;
44 static int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata) {
45 int pwdlen = strlen(userdata);
46 if (rwflag != 0 || pwdlen > size) /* not for decryption or too large */
48 memcpy(buf, userdata, pwdlen);
52 static int verify_cb(int ok, X509_STORE_CTX *ctx) {
57 err_cert = X509_STORE_CTX_get_current_cert(ctx);
58 err = X509_STORE_CTX_get_error(ctx);
59 depth = X509_STORE_CTX_get_error_depth(ctx);
61 if (depth > MAX_CERT_DEPTH) {
63 err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
64 X509_STORE_CTX_set_error(ctx, err);
69 buf = X509_NAME_oneline(X509_get_subject_name(err_cert), NULL, 0);
70 debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf ? buf : "");
75 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
77 buf = X509_NAME_oneline(X509_get_issuer_name(err_cert), NULL, 0);
79 debug(DBG_WARN, "\tIssuer=%s", buf);
85 case X509_V_ERR_CERT_NOT_YET_VALID:
86 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
87 debug(DBG_WARN, "\tCertificate not yet valid");
89 case X509_V_ERR_CERT_HAS_EXPIRED:
90 debug(DBG_WARN, "Certificate has expired");
92 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
93 debug(DBG_WARN, "Certificate no longer valid (after notAfter)");
95 case X509_V_ERR_NO_EXPLICIT_POLICY:
96 debug(DBG_WARN, "No Explicit Certificate Policy");
101 printf("certificate verify returns %d\n", ok);
107 static void ssl_info_callback(const SSL *ssl, int where, int ret) {
111 w = where & ~SSL_ST_MASK;
113 if (w & SSL_ST_CONNECT)
115 else if (w & SSL_ST_ACCEPT)
120 if (where & SSL_CB_LOOP)
121 debug(DBG_DBG, "%s:%s\n", s, SSL_state_string_long(ssl));
122 else if (where & SSL_CB_ALERT) {
123 s = (where & SSL_CB_READ) ? "read" : "write";
124 debug(DBG_DBG, "SSL3 alert %s:%s:%s\n", s, SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret));
126 else if (where & SSL_CB_EXIT) {
128 debug(DBG_DBG, "%s:failed in %s\n", s, SSL_state_string_long(ssl));
130 debug(DBG_DBG, "%s:error in %s\n", s, SSL_state_string_long(ssl));
135 static X509_VERIFY_PARAM *createverifyparams(char **poids) {
136 X509_VERIFY_PARAM *pm;
137 ASN1_OBJECT *pobject;
140 pm = X509_VERIFY_PARAM_new();
144 for (i = 0; poids[i]; i++) {
145 pobject = OBJ_txt2obj(poids[i], 0);
147 X509_VERIFY_PARAM_free(pm);
150 X509_VERIFY_PARAM_add0_policy(pm, pobject);
153 X509_VERIFY_PARAM_set_flags(pm, X509_V_FLAG_POLICY_CHECK | X509_V_FLAG_EXPLICIT_POLICY);
157 static int tlsaddcacrl(SSL_CTX *ctx, struct tls *conf) {
158 STACK_OF(X509_NAME) *calist;
162 if (!SSL_CTX_load_verify_locations(ctx, conf->cacertfile, conf->cacertpath)) {
163 while ((error = ERR_get_error()))
164 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
165 debug(DBG_ERR, "tlsaddcacrl: Error updating TLS context %s", conf->name);
169 calist = conf->cacertfile ? SSL_load_client_CA_file(conf->cacertfile) : NULL;
170 if (!conf->cacertfile || calist) {
171 if (conf->cacertpath) {
173 calist = sk_X509_NAME_new_null();
174 if (!SSL_add_dir_cert_subjects_to_stack(calist, conf->cacertpath)) {
175 sk_X509_NAME_free(calist);
181 while ((error = ERR_get_error()))
182 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
183 debug(DBG_ERR, "tlsaddcacrl: Error adding CA subjects in TLS context %s", conf->name);
186 ERR_clear_error(); /* add_dir_cert_subj returns errors on success */
187 SSL_CTX_set_client_CA_list(ctx, calist);
189 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb);
190 SSL_CTX_set_verify_depth(ctx, MAX_CERT_DEPTH + 1);
192 if (conf->crlcheck || conf->vpm) {
193 x509_s = SSL_CTX_get_cert_store(ctx);
195 X509_STORE_set_flags(x509_s, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
197 X509_STORE_set1_param(x509_s, conf->vpm);
200 debug(DBG_DBG, "tlsaddcacrl: updated TLS context %s", conf->name);
204 static SSL_CTX *tlscreatectx(uint8_t type, struct tls *conf) {
207 long sslversion = SSLeay();
212 ctx = SSL_CTX_new(TLSv1_method());
214 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
220 ctx = SSL_CTX_new(DTLSv1_method());
222 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
224 SSL_CTX_set_read_ahead(ctx, 1);
229 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
233 if (sslversion < 0x00908100L ||
234 (sslversion >= 0x10000000L && sslversion < 0x10000020L)) {
235 debug(DBG_WARN, "%s: %s seems to be of a version with a "
236 "certain security critical bug (fixed in OpenSSL 0.9.8p and "
237 "1.0.0b). Disabling OpenSSL session caching for context %p.",
238 __func__, SSLeay_version(SSLEAY_VERSION), ctx);
239 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
242 if (conf->certkeypwd) {
243 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->certkeypwd);
244 SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
246 if (!SSL_CTX_use_certificate_chain_file(ctx, conf->certfile) ||
247 !SSL_CTX_use_PrivateKey_file(ctx, conf->certkeyfile, SSL_FILETYPE_PEM) ||
248 !SSL_CTX_check_private_key(ctx)) {
249 while ((error = ERR_get_error()))
250 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
251 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
256 if (conf->policyoids) {
258 conf->vpm = createverifyparams(conf->policyoids);
260 debug(DBG_ERR, "tlscreatectx: Failed to add policyOIDs in TLS context %s", conf->name);
267 if (!tlsaddcacrl(ctx, conf)) {
269 X509_VERIFY_PARAM_free(conf->vpm);
276 debug(DBG_DBG, "tlscreatectx: created TLS context %s", conf->name);
280 struct tls *tlsgettls(char *alt1, char *alt2) {
283 t = hash_read(tlsconfs, alt1, strlen(alt1));
285 t = hash_read(tlsconfs, alt2, strlen(alt2));
289 SSL_CTX *tlsgetctx(uint8_t type, struct tls *t) {
294 gettimeofday(&now, NULL);
299 if (t->tlsexpiry && t->tlsctx) {
300 if (t->tlsexpiry < now.tv_sec) {
301 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
302 tlsaddcacrl(t->tlsctx, t);
306 t->tlsctx = tlscreatectx(RAD_TLS, t);
308 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
314 if (t->dtlsexpiry && t->dtlsctx) {
315 if (t->dtlsexpiry < now.tv_sec) {
316 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
317 tlsaddcacrl(t->dtlsctx, t);
321 t->dtlsctx = tlscreatectx(RAD_DTLS, t);
323 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
331 X509 *verifytlscert(SSL *ssl) {
335 if (SSL_get_verify_result(ssl) != X509_V_OK) {
336 debug(DBG_ERR, "verifytlscert: basic validation failed");
337 while ((error = ERR_get_error()))
338 debug(DBG_ERR, "verifytlscert: TLS: %s", ERR_error_string(error, NULL));
342 cert = SSL_get_peer_certificate(ssl);
344 debug(DBG_ERR, "verifytlscert: failed to obtain certificate");
348 static int subjectaltnameaddr(X509 *cert, int family, struct in6_addr *addr) {
349 int loc, i, l, n, r = 0;
352 STACK_OF(GENERAL_NAME) *alt;
355 debug(DBG_DBG, "subjectaltnameaddr");
357 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
361 ex = X509_get_ext(cert, loc);
362 alt = X509V3_EXT_d2i(ex);
366 n = sk_GENERAL_NAME_num(alt);
367 for (i = 0; i < n; i++) {
368 gn = sk_GENERAL_NAME_value(alt, i);
369 if (gn->type != GEN_IPADD)
372 v = (char *)ASN1_STRING_data(gn->d.ia5);
373 l = ASN1_STRING_length(gn->d.ia5);
374 if (((family == AF_INET && l == sizeof(struct in_addr)) || (family == AF_INET6 && l == sizeof(struct in6_addr)))
375 && !memcmp(v, &addr, l)) {
380 GENERAL_NAMES_free(alt);
384 static int subjectaltnameregexp(X509 *cert, int type, char *exact, regex_t *regex) {
385 int loc, i, l, n, r = 0;
388 STACK_OF(GENERAL_NAME) *alt;
391 debug(DBG_DBG, "subjectaltnameregexp");
393 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
397 ex = X509_get_ext(cert, loc);
398 alt = X509V3_EXT_d2i(ex);
402 n = sk_GENERAL_NAME_num(alt);
403 for (i = 0; i < n; i++) {
404 gn = sk_GENERAL_NAME_value(alt, i);
405 if (gn->type != type)
408 v = (char *)ASN1_STRING_data(gn->d.ia5);
409 l = ASN1_STRING_length(gn->d.ia5);
413 printfchars(NULL, gn->type == GEN_DNS ? "dns" : "uri", NULL, v, l);
416 if (memcmp(v, exact, l))
419 s = stringcopy((char *)v, l);
421 debug(DBG_ERR, "malloc failed");
424 if (regexec(regex, s, 0, NULL, 0)) {
433 GENERAL_NAMES_free(alt);
437 static int cnregexp(X509 *cert, char *exact, regex_t *regex) {
444 nm = X509_get_subject_name(cert);
447 loc = X509_NAME_get_index_by_NID(nm, NID_commonName, loc);
450 e = X509_NAME_get_entry(nm, loc);
451 t = X509_NAME_ENTRY_get_data(e);
452 v = (char *) ASN1_STRING_data(t);
453 l = ASN1_STRING_length(t);
457 if (l == strlen(exact) && !strncasecmp(exact, v, l))
460 s = stringcopy((char *)v, l);
462 debug(DBG_ERR, "malloc failed");
465 if (regexec(regex, s, 0, NULL, 0)) {
476 /* this is a bit sloppy, should not always accept match to any */
477 int certnamecheck(X509 *cert, struct list *hostports) {
478 struct list_node *entry;
479 struct hostportres *hp;
481 uint8_t type = 0; /* 0 for DNS, AF_INET for IPv4, AF_INET6 for IPv6 */
482 struct in6_addr addr;
484 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
485 hp = (struct hostportres *)entry->data;
486 if (hp->prefixlen != 255) {
487 /* we disable the check for prefixes */
490 if (inet_pton(AF_INET, hp->host, &addr))
492 else if (inet_pton(AF_INET6, hp->host, &addr))
497 r = type ? subjectaltnameaddr(cert, type, &addr) : subjectaltnameregexp(cert, GEN_DNS, hp->host, NULL);
500 debug(DBG_DBG, "certnamecheck: Found subjectaltname matching %s %s", type ? "address" : "host", hp->host);
503 debug(DBG_WARN, "certnamecheck: No subjectaltname matching %s %s", type ? "address" : "host", hp->host);
505 if (cnregexp(cert, hp->host, NULL)) {
506 debug(DBG_DBG, "certnamecheck: Found cn matching host %s", hp->host);
509 debug(DBG_WARN, "certnamecheck: cn not matching host %s", hp->host);
515 int verifyconfcert(X509 *cert, struct clsrvconf *conf) {
516 if (conf->certnamecheck) {
517 if (!certnamecheck(cert, conf->hostports)) {
518 debug(DBG_WARN, "verifyconfcert: certificate name check failed");
521 debug(DBG_WARN, "verifyconfcert: certificate name check ok");
523 if (conf->certcnregex) {
524 if (cnregexp(cert, NULL, conf->certcnregex) < 1) {
525 debug(DBG_WARN, "verifyconfcert: CN not matching regex");
528 debug(DBG_DBG, "verifyconfcert: CN matching regex");
530 if (conf->certuriregex) {
531 if (subjectaltnameregexp(cert, GEN_URI, NULL, conf->certuriregex) < 1) {
532 debug(DBG_WARN, "verifyconfcert: subjectaltname URI not matching regex");
535 debug(DBG_DBG, "verifyconfcert: subjectaltname URI matching regex");
540 int conftls_cb(struct gconffile **cf, void *arg, char *block, char *opt, char *val) {
542 long int expiry = LONG_MIN;
544 debug(DBG_DBG, "conftls_cb called for %s", block);
546 conf = malloc(sizeof(struct tls));
548 debug(DBG_ERR, "conftls_cb: malloc failed");
551 memset(conf, 0, sizeof(struct tls));
553 if (!getgenericconfig(cf, block,
554 "CACertificateFile", CONF_STR, &conf->cacertfile,
555 "CACertificatePath", CONF_STR, &conf->cacertpath,
556 "CertificateFile", CONF_STR, &conf->certfile,
557 "CertificateKeyFile", CONF_STR, &conf->certkeyfile,
558 "CertificateKeyPassword", CONF_STR, &conf->certkeypwd,
559 "CacheExpiry", CONF_LINT, &expiry,
560 "CRLCheck", CONF_BLN, &conf->crlcheck,
561 "PolicyOID", CONF_MSTR, &conf->policyoids,
564 debug(DBG_ERR, "conftls_cb: configuration error in block %s", val);
567 if (!conf->certfile || !conf->certkeyfile) {
568 debug(DBG_ERR, "conftls_cb: TLSCertificateFile and TLSCertificateKeyFile must be specified in block %s", val);
571 if (!conf->cacertfile && !conf->cacertpath) {
572 debug(DBG_ERR, "conftls_cb: CA Certificate file or path need to be specified in block %s", val);
575 if (expiry != LONG_MIN) {
577 debug(DBG_ERR, "error in block %s, value of option CacheExpiry is %ld, may not be negative", val, expiry);
580 conf->cacheexpiry = expiry;
583 conf->name = stringcopy(val, 0);
585 debug(DBG_ERR, "conftls_cb: malloc failed");
590 tlsconfs = hash_create();
591 if (!hash_insert(tlsconfs, val, strlen(val), conf)) {
592 debug(DBG_ERR, "conftls_cb: malloc failed");
595 if (!tlsgetctx(RAD_TLS, conf))
596 debug(DBG_ERR, "conftls_cb: error creating ctx for TLS block %s", val);
597 debug(DBG_DBG, "conftls_cb: added TLS block %s", val);
601 free(conf->cacertfile);
602 free(conf->cacertpath);
603 free(conf->certfile);
604 free(conf->certkeyfile);
605 free(conf->certkeypwd);
606 freegconfmstr(conf->policyoids);
611 int addmatchcertattr(struct clsrvconf *conf) {
615 if (!strncasecmp(conf->matchcertattr, "CN:/", 4)) {
616 r = &conf->certcnregex;
617 v = conf->matchcertattr + 4;
618 } else if (!strncasecmp(conf->matchcertattr, "SubjectAltName:URI:/", 20)) {
619 r = &conf->certuriregex;
620 v = conf->matchcertattr + 20;
625 /* regexp, remove optional trailing / if present */
626 if (v[strlen(v) - 1] == '/')
627 v[strlen(v) - 1] = '\0';
631 *r = malloc(sizeof(regex_t));
633 debug(DBG_ERR, "malloc failed");
636 if (regcomp(*r, v, REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
639 debug(DBG_ERR, "failed to compile regular expression %s", v);
645 /* Just to makes file non-empty, should rather avoid compiling this file when not needed */
646 static void tlsdummy() {
650 /* Local Variables: */
651 /* c-file-style: "stroustrup" */