1 /* Copyright (c) 2006-2009, Stig Venaas, UNINETT AS.
2 * Copyright (c) 2010, UNINETT AS, NORDUnet A/S.
3 * Copyright (c) 2010-2012, NORDUnet A/S. */
4 /* See LICENSE for licensing information. */
6 #if defined(RADPROT_TLS) || defined(RADPROT_DTLS)
8 #include <sys/socket.h>
9 #include <netinet/in.h>
18 #include <sys/types.h>
19 #include <sys/select.h>
22 #include <arpa/inet.h>
26 #include <openssl/ssl.h>
27 #include <openssl/rand.h>
28 #include <openssl/err.h>
29 #include <openssl/md5.h>
30 #include <openssl/x509v3.h>
35 #include "radsecproxy.h"
37 static struct hash *tlsconfs = NULL;
39 static int pem_passwd_cb(char *buf, int size, int rwflag, void *userdata) {
40 int pwdlen = strlen(userdata);
41 if (rwflag != 0 || pwdlen > size) /* not for decryption or too large */
43 memcpy(buf, userdata, pwdlen);
47 static int verify_cb(int ok, X509_STORE_CTX *ctx) {
52 err_cert = X509_STORE_CTX_get_current_cert(ctx);
53 err = X509_STORE_CTX_get_error(ctx);
54 depth = X509_STORE_CTX_get_error_depth(ctx);
56 if (depth > MAX_CERT_DEPTH) {
58 err = X509_V_ERR_CERT_CHAIN_TOO_LONG;
59 X509_STORE_CTX_set_error(ctx, err);
64 buf = X509_NAME_oneline(X509_get_subject_name(err_cert), NULL, 0);
65 debug(DBG_WARN, "verify error: num=%d:%s:depth=%d:%s", err, X509_verify_cert_error_string(err), depth, buf ? buf : "");
70 case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
72 buf = X509_NAME_oneline(X509_get_issuer_name(err_cert), NULL, 0);
74 debug(DBG_WARN, "\tIssuer=%s", buf);
80 case X509_V_ERR_CERT_NOT_YET_VALID:
81 case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
82 debug(DBG_WARN, "\tCertificate not yet valid");
84 case X509_V_ERR_CERT_HAS_EXPIRED:
85 debug(DBG_WARN, "Certificate has expired");
87 case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
88 debug(DBG_WARN, "Certificate no longer valid (after notAfter)");
90 case X509_V_ERR_NO_EXPLICIT_POLICY:
91 debug(DBG_WARN, "No Explicit Certificate Policy");
96 printf("certificate verify returns %d\n", ok);
102 static void ssl_info_callback(const SSL *ssl, int where, int ret) {
106 w = where & ~SSL_ST_MASK;
108 if (w & SSL_ST_CONNECT)
110 else if (w & SSL_ST_ACCEPT)
115 if (where & SSL_CB_LOOP)
116 debug(DBG_DBG, "%s:%s\n", s, SSL_state_string_long(ssl));
117 else if (where & SSL_CB_ALERT) {
118 s = (where & SSL_CB_READ) ? "read" : "write";
119 debug(DBG_DBG, "SSL3 alert %s:%s:%s\n", s, SSL_alert_type_string_long(ret), SSL_alert_desc_string_long(ret));
121 else if (where & SSL_CB_EXIT) {
123 debug(DBG_DBG, "%s:failed in %s\n", s, SSL_state_string_long(ssl));
125 debug(DBG_DBG, "%s:error in %s\n", s, SSL_state_string_long(ssl));
130 static X509_VERIFY_PARAM *createverifyparams(char **poids) {
131 X509_VERIFY_PARAM *pm;
132 ASN1_OBJECT *pobject;
135 pm = X509_VERIFY_PARAM_new();
139 for (i = 0; poids[i]; i++) {
140 pobject = OBJ_txt2obj(poids[i], 0);
142 X509_VERIFY_PARAM_free(pm);
145 X509_VERIFY_PARAM_add0_policy(pm, pobject);
148 X509_VERIFY_PARAM_set_flags(pm, X509_V_FLAG_POLICY_CHECK | X509_V_FLAG_EXPLICIT_POLICY);
152 static int tlsaddcacrl(SSL_CTX *ctx, struct tls *conf) {
153 STACK_OF(X509_NAME) *calist;
157 if (!SSL_CTX_load_verify_locations(ctx, conf->cacertfile, conf->cacertpath)) {
158 while ((error = ERR_get_error()))
159 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
160 debug(DBG_ERR, "tlsaddcacrl: Error updating TLS context %s", conf->name);
164 calist = conf->cacertfile ? SSL_load_client_CA_file(conf->cacertfile) : NULL;
165 if (!conf->cacertfile || calist) {
166 if (conf->cacertpath) {
168 calist = sk_X509_NAME_new_null();
169 if (!SSL_add_dir_cert_subjects_to_stack(calist, conf->cacertpath)) {
170 sk_X509_NAME_free(calist);
176 while ((error = ERR_get_error()))
177 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
178 debug(DBG_ERR, "tlsaddcacrl: Error adding CA subjects in TLS context %s", conf->name);
181 ERR_clear_error(); /* add_dir_cert_subj returns errors on success */
182 SSL_CTX_set_client_CA_list(ctx, calist);
184 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT, verify_cb);
185 SSL_CTX_set_verify_depth(ctx, MAX_CERT_DEPTH + 1);
187 if (conf->crlcheck || conf->vpm) {
188 x509_s = SSL_CTX_get_cert_store(ctx);
190 X509_STORE_set_flags(x509_s, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
192 X509_STORE_set1_param(x509_s, conf->vpm);
195 debug(DBG_DBG, "tlsaddcacrl: updated TLS context %s", conf->name);
199 static SSL_CTX *tlscreatectx(uint8_t type, struct tls *conf) {
202 long sslversion = SSLeay();
207 ctx = SSL_CTX_new(TLSv1_method());
209 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
215 ctx = SSL_CTX_new(DTLSv1_method());
217 SSL_CTX_set_info_callback(ctx, ssl_info_callback);
219 SSL_CTX_set_read_ahead(ctx, 1);
224 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
228 if (sslversion < 0x00908100L ||
229 (sslversion >= 0x10000000L && sslversion < 0x10000020L)) {
230 debug(DBG_WARN, "%s: %s seems to be of a version with a "
231 "certain security critical bug (fixed in OpenSSL 0.9.8p and "
232 "1.0.0b). Disabling OpenSSL session caching for context %p.",
233 __func__, SSLeay_version(SSLEAY_VERSION), ctx);
234 SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
237 if (conf->certkeypwd) {
238 SSL_CTX_set_default_passwd_cb_userdata(ctx, conf->certkeypwd);
239 SSL_CTX_set_default_passwd_cb(ctx, pem_passwd_cb);
241 if (!SSL_CTX_use_certificate_chain_file(ctx, conf->certfile) ||
242 !SSL_CTX_use_PrivateKey_file(ctx, conf->certkeyfile, SSL_FILETYPE_PEM) ||
243 !SSL_CTX_check_private_key(ctx)) {
244 while ((error = ERR_get_error()))
245 debug(DBG_ERR, "SSL: %s", ERR_error_string(error, NULL));
246 debug(DBG_ERR, "tlscreatectx: Error initialising SSL/TLS in TLS context %s", conf->name);
251 if (conf->policyoids) {
253 conf->vpm = createverifyparams(conf->policyoids);
255 debug(DBG_ERR, "tlscreatectx: Failed to add policyOIDs in TLS context %s", conf->name);
262 if (!tlsaddcacrl(ctx, conf)) {
264 X509_VERIFY_PARAM_free(conf->vpm);
271 debug(DBG_DBG, "tlscreatectx: created TLS context %s", conf->name);
275 struct tls *tlsgettls(char *alt1, char *alt2) {
278 t = hash_read(tlsconfs, alt1, strlen(alt1));
280 t = hash_read(tlsconfs, alt2, strlen(alt2));
284 SSL_CTX *tlsgetctx(uint8_t type, struct tls *t) {
289 gettimeofday(&now, NULL);
294 if (t->tlsexpiry && t->tlsctx) {
295 if (t->tlsexpiry < now.tv_sec) {
296 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
297 tlsaddcacrl(t->tlsctx, t);
301 t->tlsctx = tlscreatectx(RAD_TLS, t);
303 t->tlsexpiry = now.tv_sec + t->cacheexpiry;
309 if (t->dtlsexpiry && t->dtlsctx) {
310 if (t->dtlsexpiry < now.tv_sec) {
311 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
312 tlsaddcacrl(t->dtlsctx, t);
316 t->dtlsctx = tlscreatectx(RAD_DTLS, t);
318 t->dtlsexpiry = now.tv_sec + t->cacheexpiry;
326 X509 *verifytlscert(SSL *ssl) {
330 if (SSL_get_verify_result(ssl) != X509_V_OK) {
331 debug(DBG_ERR, "verifytlscert: basic validation failed");
332 while ((error = ERR_get_error()))
333 debug(DBG_ERR, "verifytlscert: TLS: %s", ERR_error_string(error, NULL));
337 cert = SSL_get_peer_certificate(ssl);
339 debug(DBG_ERR, "verifytlscert: failed to obtain certificate");
343 static int subjectaltnameaddr(X509 *cert, int family, struct in6_addr *addr) {
344 int loc, i, l, n, r = 0;
347 STACK_OF(GENERAL_NAME) *alt;
350 debug(DBG_DBG, "subjectaltnameaddr");
352 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
356 ex = X509_get_ext(cert, loc);
357 alt = X509V3_EXT_d2i(ex);
361 n = sk_GENERAL_NAME_num(alt);
362 for (i = 0; i < n; i++) {
363 gn = sk_GENERAL_NAME_value(alt, i);
364 if (gn->type != GEN_IPADD)
367 v = (char *)ASN1_STRING_data(gn->d.ia5);
368 l = ASN1_STRING_length(gn->d.ia5);
369 if (((family == AF_INET && l == sizeof(struct in_addr)) || (family == AF_INET6 && l == sizeof(struct in6_addr)))
370 && !memcmp(v, &addr, l)) {
375 GENERAL_NAMES_free(alt);
379 static int subjectaltnameregexp(X509 *cert, int type, char *exact, regex_t *regex) {
380 int loc, i, l, n, r = 0;
383 STACK_OF(GENERAL_NAME) *alt;
386 debug(DBG_DBG, "subjectaltnameregexp");
388 loc = X509_get_ext_by_NID(cert, NID_subject_alt_name, -1);
392 ex = X509_get_ext(cert, loc);
393 alt = X509V3_EXT_d2i(ex);
397 n = sk_GENERAL_NAME_num(alt);
398 for (i = 0; i < n; i++) {
399 gn = sk_GENERAL_NAME_value(alt, i);
400 if (gn->type != type)
403 v = (char *)ASN1_STRING_data(gn->d.ia5);
404 l = ASN1_STRING_length(gn->d.ia5);
408 printfchars(NULL, gn->type == GEN_DNS ? "dns" : "uri", NULL, v, l);
411 if (memcmp(v, exact, l))
414 s = stringcopy((char *)v, l);
416 debug(DBG_ERR, "malloc failed");
419 if (regexec(regex, s, 0, NULL, 0)) {
428 GENERAL_NAMES_free(alt);
432 static int cnregexp(X509 *cert, char *exact, regex_t *regex) {
439 nm = X509_get_subject_name(cert);
442 loc = X509_NAME_get_index_by_NID(nm, NID_commonName, loc);
445 e = X509_NAME_get_entry(nm, loc);
446 t = X509_NAME_ENTRY_get_data(e);
447 v = (char *) ASN1_STRING_data(t);
448 l = ASN1_STRING_length(t);
452 if (l == strlen(exact) && !strncasecmp(exact, v, l))
455 s = stringcopy((char *)v, l);
457 debug(DBG_ERR, "malloc failed");
460 if (regexec(regex, s, 0, NULL, 0)) {
471 /* this is a bit sloppy, should not always accept match to any */
472 int certnamecheck(X509 *cert, struct list *hostports) {
473 struct list_node *entry;
474 struct hostportres *hp;
476 uint8_t type = 0; /* 0 for DNS, AF_INET for IPv4, AF_INET6 for IPv6 */
477 struct in6_addr addr;
479 for (entry = list_first(hostports); entry; entry = list_next(entry)) {
480 hp = (struct hostportres *)entry->data;
481 if (hp->prefixlen != 255) {
482 /* we disable the check for prefixes */
485 if (inet_pton(AF_INET, hp->host, &addr))
487 else if (inet_pton(AF_INET6, hp->host, &addr))
492 r = type ? subjectaltnameaddr(cert, type, &addr) : subjectaltnameregexp(cert, GEN_DNS, hp->host, NULL);
495 debug(DBG_DBG, "certnamecheck: Found subjectaltname matching %s %s", type ? "address" : "host", hp->host);
498 debug(DBG_WARN, "certnamecheck: No subjectaltname matching %s %s", type ? "address" : "host", hp->host);
500 if (cnregexp(cert, hp->host, NULL)) {
501 debug(DBG_DBG, "certnamecheck: Found cn matching host %s", hp->host);
504 debug(DBG_WARN, "certnamecheck: cn not matching host %s", hp->host);
510 int verifyconfcert(X509 *cert, struct clsrvconf *conf) {
511 if (conf->certnamecheck) {
512 if (!certnamecheck(cert, conf->hostports)) {
513 debug(DBG_WARN, "verifyconfcert: certificate name check failed");
516 debug(DBG_WARN, "verifyconfcert: certificate name check ok");
518 if (conf->certcnregex) {
519 if (cnregexp(cert, NULL, conf->certcnregex) < 1) {
520 debug(DBG_WARN, "verifyconfcert: CN not matching regex");
523 debug(DBG_DBG, "verifyconfcert: CN matching regex");
525 if (conf->certuriregex) {
526 if (subjectaltnameregexp(cert, GEN_URI, NULL, conf->certuriregex) < 1) {
527 debug(DBG_WARN, "verifyconfcert: subjectaltname URI not matching regex");
530 debug(DBG_DBG, "verifyconfcert: subjectaltname URI matching regex");
535 int conftls_cb(struct gconffile **cf, void *arg, char *block, char *opt, char *val) {
537 long int expiry = LONG_MIN;
539 debug(DBG_DBG, "conftls_cb called for %s", block);
541 conf = malloc(sizeof(struct tls));
543 debug(DBG_ERR, "conftls_cb: malloc failed");
546 memset(conf, 0, sizeof(struct tls));
548 if (!getgenericconfig(cf, block,
549 "CACertificateFile", CONF_STR, &conf->cacertfile,
550 "CACertificatePath", CONF_STR, &conf->cacertpath,
551 "CertificateFile", CONF_STR, &conf->certfile,
552 "CertificateKeyFile", CONF_STR, &conf->certkeyfile,
553 "CertificateKeyPassword", CONF_STR, &conf->certkeypwd,
554 "CacheExpiry", CONF_LINT, &expiry,
555 "CRLCheck", CONF_BLN, &conf->crlcheck,
556 "PolicyOID", CONF_MSTR, &conf->policyoids,
559 debug(DBG_ERR, "conftls_cb: configuration error in block %s", val);
562 if (!conf->certfile || !conf->certkeyfile) {
563 debug(DBG_ERR, "conftls_cb: TLSCertificateFile and TLSCertificateKeyFile must be specified in block %s", val);
566 if (!conf->cacertfile && !conf->cacertpath) {
567 debug(DBG_ERR, "conftls_cb: CA Certificate file or path need to be specified in block %s", val);
570 if (expiry != LONG_MIN) {
572 debug(DBG_ERR, "error in block %s, value of option CacheExpiry is %ld, may not be negative", val, expiry);
575 conf->cacheexpiry = expiry;
578 conf->name = stringcopy(val, 0);
580 debug(DBG_ERR, "conftls_cb: malloc failed");
585 tlsconfs = hash_create();
586 if (!hash_insert(tlsconfs, val, strlen(val), conf)) {
587 debug(DBG_ERR, "conftls_cb: malloc failed");
590 if (!tlsgetctx(RAD_TLS, conf))
591 debug(DBG_ERR, "conftls_cb: error creating ctx for TLS block %s", val);
592 debug(DBG_DBG, "conftls_cb: added TLS block %s", val);
596 free(conf->cacertfile);
597 free(conf->cacertpath);
598 free(conf->certfile);
599 free(conf->certkeyfile);
600 free(conf->certkeypwd);
601 freegconfmstr(conf->policyoids);
606 int addmatchcertattr(struct clsrvconf *conf) {
610 if (!strncasecmp(conf->matchcertattr, "CN:/", 4)) {
611 r = &conf->certcnregex;
612 v = conf->matchcertattr + 4;
613 } else if (!strncasecmp(conf->matchcertattr, "SubjectAltName:URI:/", 20)) {
614 r = &conf->certuriregex;
615 v = conf->matchcertattr + 20;
620 /* regexp, remove optional trailing / if present */
621 if (v[strlen(v) - 1] == '/')
622 v[strlen(v) - 1] = '\0';
626 *r = malloc(sizeof(regex_t));
628 debug(DBG_ERR, "malloc failed");
631 if (regcomp(*r, v, REG_EXTENDED | REG_ICASE | REG_NOSUB)) {
634 debug(DBG_ERR, "failed to compile regular expression %s", v);
640 /* Just to makes file non-empty, should rather avoid compiling this file when not needed */
641 static void tlsdummy() {
645 /* Local Variables: */
646 /* c-file-style: "stroustrup" */