2 * Copyright (C) 2006-2009 Stig Venaas <venaas@uninett.no>
4 * Permission to use, copy, modify, and distribute this software for any
5 * purpose with or without fee is hereby granted, provided that the above
6 * copyright notice and this permission notice appear in all copies.
9 #if defined(RADPROT_TLS) || defined(RADPROT_DTLS)
11 #include <sys/socket.h>
12 #include <netinet/in.h>
21 #include <sys/types.h>
22 #include <sys/select.h>
25 #include <arpa/inet.h>
29 #include <openssl/ssl.h>
30 #include <openssl/rand.h>
31 #include <openssl/err.h>
32 #include <openssl/md5.h>
33 #include <openssl/x509v3.h>
39 #include "radsecproxy.h"
41 static struct hash *tlsconfs = NULL;
43 static int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata) {
44 int pwdlen = strlen(userdata);
45 if (rwflag != 0 || pwdlen > size) /* not for decryption or too large */
47 memcpy(buf, userdata, pwdlen);
51 static int verify_cb(int ok, X509_STORE_CTX *ctx) {
56 err_cert = X509_STORE_CTX_get_current_cert(ctx);
57 err = X509_STORE_CTX_get_error(ctx);
58 depth = X509_STORE_CTX_get_error_depth(ctx);
60 if (depth > MAX_CERT_DEPTH) {
62 err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
63 X509_STORE_CTX_set_error(ctx, err);
68 buf = X509_NAME_oneline(X509_get_subject_name(err_cert), NULL, 0);
69 debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf ? buf : "");
74 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
76 buf = X509_NAME_oneline(X509_get_issuer_name(err_cert), NULL, 0);
78 debug(DBG_WARN, "\tIssuer=%s", buf);
84 case X509_V_ERR_CERT_NOT_YET_VALID:
85 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
86 debug(DBG_WARN, "\tCertificate not yet valid");
88 case X509_V_ERR_CERT_HAS_EXPIRED:
89 debug(DBG_WARN, "Certificate has expired");
91 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
92 debug(DBG_WARN, "Certificate no longer valid (after notAfter)");
94 case X509_V_ERR_NO_EXPLICIT_POLICY:
95 debug(DBG_WARN, "No Explicit Certificate Policy");
100 printf("certificate verify returns %d\n", ok);
106 static void ssl_info_callback(const SSL *ssl, int where, int ret) {
110 w = where & ~SSL_ST_MASK;
112 if (w & SSL_ST_CONNECT)
114 else if (w & SSL_ST_ACCEPT)
119 if (where & SSL_CB_LOOP)
120 debug(DBG_DBG, "%s:%s\n", s, SSL_state_string_long(ssl));
121 else if (where & SSL_CB_ALERT) {
122 s = (where & SSL_CB_READ) ? "read" : "write";
123 debug(DBG_DBG, "SSL3 alert %s:%s:%s\n", s, SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret));
125 else if (where & SSL_CB_EXIT) {
127 debug(DBG_DBG, "%s:failed in %s\n", s, SSL_state_string_long(ssl));
129 debug(DBG_DBG, "%s:error in %s\n", s, SSL_state_string_long(ssl));
134 static X509_VERIFY_PARAM *createverifyparams(char **poids) {
135 X509_VERIFY_PARAM *pm;
136 ASN1_OBJECT *pobject;
139 pm = X509_VERIFY_PARAM_new();
143 for (i = 0; poids[i]; i++) {
144 pobject = OBJ_txt2obj(poids[i], 0);
146 X509_VERIFY_PARAM_free(pm);
149 X509_VERIFY_PARAM_add0_policy(pm, pobject);
152 X509_VERIFY_PARAM_set_flags(pm, X509_V_FLAG_POLICY_CHECK | X509_V_FLAG_EXPLICIT_POLICY);
156 static int tlsaddcacrl(SSL_CTX *ctx, struct tls *conf) {
157 STACK_OF(X509_NAME) *calist;
161 if (!SSL_CTX_load_verify_locations(ctx, conf->cacertfile, conf->cacertpath)) {
162 while ((error = ERR_get_error()))
163 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
164 debug(DBG_ERR, "tlsaddcacrl: Error updating TLS context %s", conf->name);
168 calist = conf->cacertfile ? SSL_load_client_CA_file(conf->cacertfile) : NULL;
169 if (!conf->cacertfile || calist) {
170 if (conf->cacertpath) {
172 calist = sk_X509_NAME_new_null();
173 if (!SSL_add_dir_cert_subjects_to_stack(calist, conf->cacertpath)) {
174 sk_X509_NAME_free(calist);
180 while ((error = ERR_get_error()))
181 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
182 debug(DBG_ERR, "tlsaddcacrl: Error adding CA subjects in TLS context %s", conf->name);
185 ERR_clear_error(); /* add_dir_cert_subj returns errors on success */
186 SSL_CTX_set_client_CA_list(ctx, calist);
188 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb);
189 SSL_CTX_set_verify_depth(ctx, MAX_CERT_DEPTH + 1);
191 if (conf->crlcheck || conf->vpm) {
192 x509_s = SSL_CTX_get_cert_store(ctx);
194 X509_STORE_set_flags(x509_s, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
196 X509_STORE_set1_param(x509_s, conf->vpm);
199 debug(DBG_DBG, "tlsaddcacrl: updated TLS context %s", conf->name);
203 static SSL_CTX *tlscreatectx(uint8_t type, struct tls *conf) {
210 ctx = SSL_CTX_new(TLSv1_method());
212 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
218 ctx = SSL_CTX_new(DTLSv1_method());
220 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
222 SSL_CTX_set_read_ahead(ctx, 1);
227 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
230 #if OPENSSL_VERSION_NUMBER < 0x0090810f \
231 || (OPENSSL_VERSION_NUMBER >= 0x1000000f \
232 && OPENSSL_VERSION_NUMBER < 0x1000002f)
233 debug(DBG_WARN, "%s: OpenSSL seems to be of a version with a "
234 "certain security critical bug (fixed in OpenSSL 0.9.8p and "
235 "1.0.0b). Disabling OpenSSL session caching for context %p.",
237 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
240 if (conf->certkeypwd) {
241 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->certkeypwd);
242 SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
244 if (!SSL_CTX_use_certificate_chain_file(ctx, conf->certfile) ||
245 !SSL_CTX_use_PrivateKey_file(ctx, conf->certkeyfile, SSL_FILETYPE_PEM) ||
246 !SSL_CTX_check_private_key(ctx)) {
247 while ((error = ERR_get_error()))
248 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
249 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
254 if (conf->policyoids) {
256 conf->vpm = createverifyparams(conf->policyoids);
258 debug(DBG_ERR, "tlscreatectx: Failed to add policyOIDs in TLS context %s", conf->name);
265 if (!tlsaddcacrl(ctx, conf)) {
267 X509_VERIFY_PARAM_free(conf->vpm);
274 debug(DBG_DBG, "tlscreatectx: created TLS context %s", conf->name);
278 struct tls *tlsgettls(char *alt1, char *alt2) {
281 t = hash_read(tlsconfs, alt1, strlen(alt1));
283 t = hash_read(tlsconfs, alt2, strlen(alt2));
287 SSL_CTX *tlsgetctx(uint8_t type, struct tls *t) {
292 gettimeofday(&now, NULL);
297 if (t->tlsexpiry && t->tlsctx) {
298 if (t->tlsexpiry < now.tv_sec) {
299 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
300 tlsaddcacrl(t->tlsctx, t);
304 t->tlsctx = tlscreatectx(RAD_TLS, t);
306 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
312 if (t->dtlsexpiry && t->dtlsctx) {
313 if (t->dtlsexpiry < now.tv_sec) {
314 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
315 tlsaddcacrl(t->dtlsctx, t);
319 t->dtlsctx = tlscreatectx(RAD_DTLS, t);
321 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
329 X509 *verifytlscert(SSL *ssl) {
333 if (SSL_get_verify_result(ssl) != X509_V_OK) {
334 debug(DBG_ERR, "verifytlscert: basic validation failed");
335 while ((error = ERR_get_error()))
336 debug(DBG_ERR, "verifytlscert: TLS: %s", ERR_error_string(error, NULL));
340 cert = SSL_get_peer_certificate(ssl);
342 debug(DBG_ERR, "verifytlscert: failed to obtain certificate");
346 static int subjectaltnameaddr(X509 *cert, int family, struct in6_addr *addr) {
347 int loc, i, l, n, r = 0;
350 STACK_OF(GENERAL_NAME) *alt;
353 debug(DBG_DBG, "subjectaltnameaddr");
355 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
359 ex = X509_get_ext(cert, loc);
360 alt = X509V3_EXT_d2i(ex);
364 n = sk_GENERAL_NAME_num(alt);
365 for (i = 0; i < n; i++) {
366 gn = sk_GENERAL_NAME_value(alt, i);
367 if (gn->type != GEN_IPADD)
370 v = (char *)ASN1_STRING_data(gn->d.ia5);
371 l = ASN1_STRING_length(gn->d.ia5);
372 if (((family == AF_INET && l == sizeof(struct in_addr)) || (family == AF_INET6 && l == sizeof(struct in6_addr)))
373 && !memcmp(v, &addr, l)) {
378 GENERAL_NAMES_free(alt);
382 static int subjectaltnameregexp(X509 *cert, int type, char *exact, regex_t *regex) {
383 int loc, i, l, n, r = 0;
386 STACK_OF(GENERAL_NAME) *alt;
389 debug(DBG_DBG, "subjectaltnameregexp");
391 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
395 ex = X509_get_ext(cert, loc);
396 alt = X509V3_EXT_d2i(ex);
400 n = sk_GENERAL_NAME_num(alt);
401 for (i = 0; i < n; i++) {
402 gn = sk_GENERAL_NAME_value(alt, i);
403 if (gn->type != type)
406 v = (char *)ASN1_STRING_data(gn->d.ia5);
407 l = ASN1_STRING_length(gn->d.ia5);
411 printfchars(NULL, gn->type == GEN_DNS ? "dns" : "uri", NULL, v, l);
414 if (memcmp(v, exact, l))
417 s = stringcopy((char *)v, l);
419 debug(DBG_ERR, "malloc failed");
422 if (regexec(regex, s, 0, NULL, 0)) {
431 GENERAL_NAMES_free(alt);
435 static int cnregexp(X509 *cert, char *exact, regex_t *regex) {
442 nm = X509_get_subject_name(cert);
445 loc = X509_NAME_get_index_by_NID(nm, NID_commonName, loc);
448 e = X509_NAME_get_entry(nm, loc);
449 t = X509_NAME_ENTRY_get_data(e);
450 v = (char *) ASN1_STRING_data(t);
451 l = ASN1_STRING_length(t);
455 if (l == strlen(exact) && !strncasecmp(exact, v, l))
458 s = stringcopy((char *)v, l);
460 debug(DBG_ERR, "malloc failed");
463 if (regexec(regex, s, 0, NULL, 0)) {
474 /* this is a bit sloppy, should not always accept match to any */
475 int certnamecheck(X509 *cert, struct list *hostports) {
476 struct list_node *entry;
477 struct hostportres *hp;
479 uint8_t type = 0; /* 0 for DNS, AF_INET for IPv4, AF_INET6 for IPv6 */
480 struct in6_addr addr;
482 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
483 hp = (struct hostportres *)entry->data;
484 if (hp->prefixlen != 255) {
485 /* we disable the check for prefixes */
488 if (inet_pton(AF_INET, hp->host, &addr))
490 else if (inet_pton(AF_INET6, hp->host, &addr))
495 r = type ? subjectaltnameaddr(cert, type, &addr) : subjectaltnameregexp(cert, GEN_DNS, hp->host, NULL);
498 debug(DBG_DBG, "certnamecheck: Found subjectaltname matching %s %s", type ? "address" : "host", hp->host);
501 debug(DBG_WARN, "certnamecheck: No subjectaltname matching %s %s", type ? "address" : "host", hp->host);
503 if (cnregexp(cert, hp->host, NULL)) {
504 debug(DBG_DBG, "certnamecheck: Found cn matching host %s", hp->host);
507 debug(DBG_WARN, "certnamecheck: cn not matching host %s", hp->host);
513 int verifyconfcert(X509 *cert, struct clsrvconf *conf) {
514 if (conf->certnamecheck) {
515 if (!certnamecheck(cert, conf->hostports)) {
516 debug(DBG_WARN, "verifyconfcert: certificate name check failed");
519 debug(DBG_WARN, "verifyconfcert: certificate name check ok");
521 if (conf->certcnregex) {
522 if (cnregexp(cert, NULL, conf->certcnregex) < 1) {
523 debug(DBG_WARN, "verifyconfcert: CN not matching regex");
526 debug(DBG_DBG, "verifyconfcert: CN matching regex");
528 if (conf->certuriregex) {
529 if (subjectaltnameregexp(cert, GEN_URI, NULL, conf->certuriregex) < 1) {
530 debug(DBG_WARN, "verifyconfcert: subjectaltname URI not matching regex");
533 debug(DBG_DBG, "verifyconfcert: subjectaltname URI matching regex");
538 int conftls_cb(struct gconffile **cf, void *arg, char *block, char *opt, char *val) {
540 long int expiry = LONG_MIN;
542 debug(DBG_DBG, "conftls_cb called for %s", block);
544 conf = malloc(sizeof(struct tls));
546 debug(DBG_ERR, "conftls_cb: malloc failed");
549 memset(conf, 0, sizeof(struct tls));
551 if (!getgenericconfig(cf, block,
552 "CACertificateFile", CONF_STR, &conf->cacertfile,
553 "CACertificatePath", CONF_STR, &conf->cacertpath,
554 "CertificateFile", CONF_STR, &conf->certfile,
555 "CertificateKeyFile", CONF_STR, &conf->certkeyfile,
556 "CertificateKeyPassword", CONF_STR, &conf->certkeypwd,
557 "CacheExpiry", CONF_LINT, &expiry,
558 "CRLCheck", CONF_BLN, &conf->crlcheck,
559 "PolicyOID", CONF_MSTR, &conf->policyoids,
562 debug(DBG_ERR, "conftls_cb: configuration error in block %s", val);
565 if (!conf->certfile || !conf->certkeyfile) {
566 debug(DBG_ERR, "conftls_cb: TLSCertificateFile and TLSCertificateKeyFile must be specified in block %s", val);
569 if (!conf->cacertfile && !conf->cacertpath) {
570 debug(DBG_ERR, "conftls_cb: CA Certificate file or path need to be specified in block %s", val);
573 if (expiry != LONG_MIN) {
575 debug(DBG_ERR, "error in block %s, value of option CacheExpiry is %ld, may not be negative", val, expiry);
578 conf->cacheexpiry = expiry;
581 conf->name = stringcopy(val, 0);
583 debug(DBG_ERR, "conftls_cb: malloc failed");
588 tlsconfs = hash_create();
589 if (!hash_insert(tlsconfs, val, strlen(val), conf)) {
590 debug(DBG_ERR, "conftls_cb: malloc failed");
593 if (!tlsgetctx(RAD_TLS, conf))
594 debug(DBG_ERR, "conftls_cb: error creating ctx for TLS block %s", val);
595 debug(DBG_DBG, "conftls_cb: added TLS block %s", val);
599 free(conf->cacertfile);
600 free(conf->cacertpath);
601 free(conf->certfile);
602 free(conf->certkeyfile);
603 free(conf->certkeypwd);
604 freegconfmstr(conf->policyoids);
609 int addmatchcertattr(struct clsrvconf *conf) {
613 if (!strncasecmp(conf->matchcertattr, "CN:/", 4)) {
614 r = &conf->certcnregex;
615 v = conf->matchcertattr + 4;
616 } else if (!strncasecmp(conf->matchcertattr, "SubjectAltName:URI:/", 20)) {
617 r = &conf->certuriregex;
618 v = conf->matchcertattr + 20;
623 /* regexp, remove optional trailing / if present */
624 if (v[strlen(v) - 1] == '/')
625 v[strlen(v) - 1] = '\0';
629 *r = malloc(sizeof(regex_t));
631 debug(DBG_ERR, "malloc failed");
634 if (regcomp(*r, v, REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
637 debug(DBG_ERR, "failed to compile regular expression %s", v);
643 /* Just to makes file non-empty, should rather avoid compiling this file when not needed */
644 static void tlsdummy() {
648 /* Local Variables: */
649 /* c-file-style: "stroustrup" */