2 * Copyright (C) 2006-2008 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>
38 #include "radsecproxy.h"
40 static struct hash *tlsconfs = NULL;
42 static int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata) {
43 int pwdlen = strlen(userdata);
44 if (rwflag != 0 || pwdlen > size) /* not for decryption or too large */
46 memcpy(buf, userdata, pwdlen);
50 static int verify_cb(int ok, X509_STORE_CTX *ctx) {
55 err_cert = X509_STORE_CTX_get_current_cert(ctx);
56 err = X509_STORE_CTX_get_error(ctx);
57 depth = X509_STORE_CTX_get_error_depth(ctx);
59 if (depth > MAX_CERT_DEPTH) {
61 err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
62 X509_STORE_CTX_set_error(ctx, err);
67 buf = X509_NAME_oneline(X509_get_subject_name(err_cert), NULL, 0);
68 debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf ? buf : "");
73 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
75 buf = X509_NAME_oneline(X509_get_issuer_name(err_cert), NULL, 0);
77 debug(DBG_WARN, "\tIssuer=%s", buf);
83 case X509_V_ERR_CERT_NOT_YET_VALID:
84 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
85 debug(DBG_WARN, "\tCertificate not yet valid");
87 case X509_V_ERR_CERT_HAS_EXPIRED:
88 debug(DBG_WARN, "Certificate has expired");
90 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
91 debug(DBG_WARN, "Certificate no longer valid (after notAfter)");
93 case X509_V_ERR_NO_EXPLICIT_POLICY:
94 debug(DBG_WARN, "No Explicit Certificate Policy");
99 printf("certificate verify returns %d\n", ok);
105 static void ssl_info_callback(const SSL *ssl, int where, int ret) {
109 w = where & ~SSL_ST_MASK;
111 if (w & SSL_ST_CONNECT)
113 else if (w & SSL_ST_ACCEPT)
118 if (where & SSL_CB_LOOP)
119 debug(DBG_DBG, "%s:%s\n", s, SSL_state_string_long(ssl));
120 else if (where & SSL_CB_ALERT) {
121 s = (where & SSL_CB_READ) ? "read" : "write";
122 debug(DBG_DBG, "SSL3 alert %s:%s:%s\n", s, SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret));
124 else if (where & SSL_CB_EXIT) {
126 debug(DBG_DBG, "%s:failed in %s\n", s, SSL_state_string_long(ssl));
128 debug(DBG_DBG, "%s:error in %s\n", s, SSL_state_string_long(ssl));
133 static X509_VERIFY_PARAM *createverifyparams(char **poids) {
134 X509_VERIFY_PARAM *pm;
135 ASN1_OBJECT *pobject;
138 pm = X509_VERIFY_PARAM_new();
142 for (i = 0; poids[i]; i++) {
143 pobject = OBJ_txt2obj(poids[i], 0);
145 X509_VERIFY_PARAM_free(pm);
148 X509_VERIFY_PARAM_add0_policy(pm, pobject);
151 X509_VERIFY_PARAM_set_flags(pm, X509_V_FLAG_POLICY_CHECK | X509_V_FLAG_EXPLICIT_POLICY);
155 static int tlsaddcacrl(SSL_CTX *ctx, struct tls *conf) {
156 STACK_OF(X509_NAME) *calist;
160 if (!SSL_CTX_load_verify_locations(ctx, conf->cacertfile, conf->cacertpath)) {
161 while ((error = ERR_get_error()))
162 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
163 debug(DBG_ERR, "tlsaddcacrl: Error updating TLS context %s", conf->name);
167 calist = conf->cacertfile ? SSL_load_client_CA_file(conf->cacertfile) : NULL;
168 if (!conf->cacertfile || calist) {
169 if (conf->cacertpath) {
171 calist = sk_X509_NAME_new_null();
172 if (!SSL_add_dir_cert_subjects_to_stack(calist, conf->cacertpath)) {
173 sk_X509_NAME_free(calist);
179 while ((error = ERR_get_error()))
180 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
181 debug(DBG_ERR, "tlsaddcacrl: Error adding CA subjects in TLS context %s", conf->name);
184 ERR_clear_error(); /* add_dir_cert_subj returns errors on success */
185 SSL_CTX_set_client_CA_list(ctx, calist);
187 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb);
188 SSL_CTX_set_verify_depth(ctx, MAX_CERT_DEPTH + 1);
190 if (conf->crlcheck || conf->vpm) {
191 x509_s = SSL_CTX_get_cert_store(ctx);
193 X509_STORE_set_flags(x509_s, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
195 X509_STORE_set1_param(x509_s, conf->vpm);
198 debug(DBG_DBG, "tlsaddcacrl: updated TLS context %s", conf->name);
202 static SSL_CTX *tlscreatectx(uint8_t type, struct tls *conf) {
209 ctx = SSL_CTX_new(TLSv1_method());
211 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
217 ctx = SSL_CTX_new(DTLSv1_method());
219 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
221 SSL_CTX_set_read_ahead(ctx, 1);
226 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
230 if (conf->certkeypwd) {
231 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->certkeypwd);
232 SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
234 if (!SSL_CTX_use_certificate_chain_file(ctx, conf->certfile) ||
235 !SSL_CTX_use_PrivateKey_file(ctx, conf->certkeyfile, SSL_FILETYPE_PEM) ||
236 !SSL_CTX_check_private_key(ctx)) {
237 while ((error = ERR_get_error()))
238 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
239 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
244 if (conf->policyoids) {
246 conf->vpm = createverifyparams(conf->policyoids);
248 debug(DBG_ERR, "tlscreatectx: Failed to add policyOIDs in TLS context %s", conf->name);
255 if (!tlsaddcacrl(ctx, conf)) {
257 X509_VERIFY_PARAM_free(conf->vpm);
264 debug(DBG_DBG, "tlscreatectx: created TLS context %s", conf->name);
268 struct tls *tlsgettls(char *alt1, char *alt2) {
271 t = hash_read(tlsconfs, alt1, strlen(alt1));
273 t = hash_read(tlsconfs, alt2, strlen(alt2));
277 SSL_CTX *tlsgetctx(uint8_t type, struct tls *t) {
282 gettimeofday(&now, NULL);
287 if (t->tlsexpiry && t->tlsctx) {
288 if (t->tlsexpiry < now.tv_sec) {
289 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
290 tlsaddcacrl(t->tlsctx, t);
294 t->tlsctx = tlscreatectx(RAD_TLS, t);
296 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
302 if (t->dtlsexpiry && t->dtlsctx) {
303 if (t->dtlsexpiry < now.tv_sec) {
304 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
305 tlsaddcacrl(t->dtlsctx, t);
309 t->dtlsctx = tlscreatectx(RAD_DTLS, t);
311 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
319 X509 *verifytlscert(SSL *ssl) {
323 if (SSL_get_verify_result(ssl) != X509_V_OK) {
324 debug(DBG_ERR, "verifytlscert: basic validation failed");
325 while ((error = ERR_get_error()))
326 debug(DBG_ERR, "verifytlscert: TLS: %s", ERR_error_string(error, NULL));
330 cert = SSL_get_peer_certificate(ssl);
332 debug(DBG_ERR, "verifytlscert: failed to obtain certificate");
336 static int subjectaltnameaddr(X509 *cert, int family, struct in6_addr *addr) {
337 int loc, i, l, n, r = 0;
340 STACK_OF(GENERAL_NAME) *alt;
343 debug(DBG_DBG, "subjectaltnameaddr");
345 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
349 ex = X509_get_ext(cert, loc);
350 alt = X509V3_EXT_d2i(ex);
354 n = sk_GENERAL_NAME_num(alt);
355 for (i = 0; i < n; i++) {
356 gn = sk_GENERAL_NAME_value(alt, i);
357 if (gn->type != GEN_IPADD)
360 v = (char *)ASN1_STRING_data(gn->d.ia5);
361 l = ASN1_STRING_length(gn->d.ia5);
362 if (((family == AF_INET && l == sizeof(struct in_addr)) || (family == AF_INET6 && l == sizeof(struct in6_addr)))
363 && !memcmp(v, &addr, l)) {
368 GENERAL_NAMES_free(alt);
372 static int subjectaltnameregexp(X509 *cert, int type, char *exact, regex_t *regex) {
373 int loc, i, l, n, r = 0;
376 STACK_OF(GENERAL_NAME) *alt;
379 debug(DBG_DBG, "subjectaltnameregexp");
381 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
385 ex = X509_get_ext(cert, loc);
386 alt = X509V3_EXT_d2i(ex);
390 n = sk_GENERAL_NAME_num(alt);
391 for (i = 0; i < n; i++) {
392 gn = sk_GENERAL_NAME_value(alt, i);
393 if (gn->type != type)
396 v = (char *)ASN1_STRING_data(gn->d.ia5);
397 l = ASN1_STRING_length(gn->d.ia5);
401 printfchars(NULL, gn->type == GEN_DNS ? "dns" : "uri", NULL, v, l);
404 if (memcmp(v, exact, l))
407 s = stringcopy((char *)v, l);
409 debug(DBG_ERR, "malloc failed");
412 if (regexec(regex, s, 0, NULL, 0)) {
421 GENERAL_NAMES_free(alt);
425 static int cnregexp(X509 *cert, char *exact, regex_t *regex) {
432 nm = X509_get_subject_name(cert);
435 loc = X509_NAME_get_index_by_NID(nm, NID_commonName, loc);
438 e = X509_NAME_get_entry(nm, loc);
439 t = X509_NAME_ENTRY_get_data(e);
440 v = (char *) ASN1_STRING_data(t);
441 l = ASN1_STRING_length(t);
445 if (l == strlen(exact) && !strncasecmp(exact, v, l))
448 s = stringcopy((char *)v, l);
450 debug(DBG_ERR, "malloc failed");
453 if (regexec(regex, s, 0, NULL, 0)) {
464 int verifyconfcert(X509 *cert, struct clsrvconf *conf) {
466 uint8_t type = 0; /* 0 for DNS, AF_INET for IPv4, AF_INET6 for IPv6 */
467 struct in6_addr addr;
469 if (conf->certnamecheck && conf->prefixlen == 255) {
470 if (inet_pton(AF_INET, conf->host, &addr))
472 else if (inet_pton(AF_INET6, conf->host, &addr))
475 r = type ? subjectaltnameaddr(cert, type, &addr) : subjectaltnameregexp(cert, GEN_DNS, conf->host, NULL);
478 debug(DBG_WARN, "verifyconfcert: No subjectaltname matching %s %s", type ? "address" : "host", conf->host);
481 debug(DBG_DBG, "verifyconfcert: Found subjectaltname matching %s %s", type ? "address" : "host", conf->host);
483 if (!cnregexp(cert, conf->host, NULL)) {
484 debug(DBG_WARN, "verifyconfcert: cn not matching host %s", conf->host);
487 debug(DBG_DBG, "verifyconfcert: Found cn matching host %s", conf->host);
490 if (conf->certcnregex) {
491 if (cnregexp(cert, NULL, conf->certcnregex) < 1) {
492 debug(DBG_WARN, "verifyconfcert: CN not matching regex");
495 debug(DBG_DBG, "verifyconfcert: CN matching regex");
497 if (conf->certuriregex) {
498 if (subjectaltnameregexp(cert, GEN_URI, NULL, conf->certuriregex) < 1) {
499 debug(DBG_WARN, "verifyconfcert: subjectaltname URI not matching regex");
502 debug(DBG_DBG, "verifyconfcert: subjectaltname URI matching regex");
507 int conftls_cb(struct gconffile **cf, void *arg, char *block, char *opt, char *val) {
509 long int expiry = LONG_MIN;
511 debug(DBG_DBG, "conftls_cb called for %s", block);
513 conf = malloc(sizeof(struct tls));
515 debug(DBG_ERR, "conftls_cb: malloc failed");
518 memset(conf, 0, sizeof(struct tls));
520 if (!getgenericconfig(cf, block,
521 "CACertificateFile", CONF_STR, &conf->cacertfile,
522 "CACertificatePath", CONF_STR, &conf->cacertpath,
523 "CertificateFile", CONF_STR, &conf->certfile,
524 "CertificateKeyFile", CONF_STR, &conf->certkeyfile,
525 "CertificateKeyPassword", CONF_STR, &conf->certkeypwd,
526 "CacheExpiry", CONF_LINT, &expiry,
527 "CRLCheck", CONF_BLN, &conf->crlcheck,
528 "PolicyOID", CONF_MSTR, &conf->policyoids,
531 debug(DBG_ERR, "conftls_cb: configuration error in block %s", val);
534 if (!conf->certfile || !conf->certkeyfile) {
535 debug(DBG_ERR, "conftls_cb: TLSCertificateFile and TLSCertificateKeyFile must be specified in block %s", val);
538 if (!conf->cacertfile && !conf->cacertpath) {
539 debug(DBG_ERR, "conftls_cb: CA Certificate file or path need to be specified in block %s", val);
542 if (expiry != LONG_MIN) {
544 debug(DBG_ERR, "error in block %s, value of option CacheExpiry is %ld, may not be negative", val, expiry);
547 conf->cacheexpiry = expiry;
550 conf->name = stringcopy(val, 0);
552 debug(DBG_ERR, "conftls_cb: malloc failed");
557 tlsconfs = hash_create();
558 if (!hash_insert(tlsconfs, val, strlen(val), conf)) {
559 debug(DBG_ERR, "conftls_cb: malloc failed");
562 if (!tlsgetctx(RAD_TLS, conf))
563 debug(DBG_ERR, "conftls_cb: error creating ctx for TLS block %s", val);
564 debug(DBG_DBG, "conftls_cb: added TLS block %s", val);
568 free(conf->cacertfile);
569 free(conf->cacertpath);
570 free(conf->certfile);
571 free(conf->certkeyfile);
572 free(conf->certkeypwd);
573 freegconfmstr(conf->policyoids);
578 int addmatchcertattr(struct clsrvconf *conf) {
582 if (!strncasecmp(conf->matchcertattr, "CN:/", 4)) {
583 r = &conf->certcnregex;
584 v = conf->matchcertattr + 4;
585 } else if (!strncasecmp(conf->matchcertattr, "SubjectAltName:URI:/", 20)) {
586 r = &conf->certuriregex;
587 v = conf->matchcertattr + 20;
592 /* regexp, remove optional trailing / if present */
593 if (v[strlen(v) - 1] == '/')
594 v[strlen(v) - 1] = '\0';
598 *r = malloc(sizeof(regex_t));
600 debug(DBG_ERR, "malloc failed");
603 if (regcomp(*r, v, REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
606 debug(DBG_ERR, "failed to compile regular expression %s", v);
612 /* Just to makes file non-empty, should rather avoid compiling this file when not needed */
613 static void tlsdummy() {