2 * Copyright (C) 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.
10 #include <sys/socket.h>
11 #include <netinet/in.h>
20 #include <sys/types.h>
21 #include <sys/select.h>
24 #include <arpa/inet.h>
27 #include <openssl/ssl.h>
28 #include <openssl/err.h>
33 #include "radsecproxy.h"
35 void *udpdtlsserverrd(void *arg);
36 int dtlsconnect(struct server *server, struct timeval *when, int timeout, char *text);
37 void *dtlsclientrd(void *arg);
38 int clientradputdtls(struct server *server, unsigned char *rad);
39 void addserverextradtls(struct clsrvconf *conf);
40 void dtlssetsrcres(char *source);
43 static const struct protodefs protodefs = {
45 "mysecret", /* secretdefault */
46 SOCK_DGRAM, /* socktype */
47 "2083", /* portdefault */
48 REQUEST_RETRY_COUNT, /* retrycountdefault */
49 10, /* retrycountmax */
50 REQUEST_RETRY_INTERVAL, /* retryintervaldefault */
51 60, /* retryintervalmax */
52 DUPLICATE_INTERVAL, /* duplicateintervaldefault */
53 udpdtlsserverrd, /* listener */
54 dtlsconnect, /* connecter */
55 dtlsclientrd, /* clientconnreader */
56 clientradputdtls, /* clientradput */
58 addserverextradtls, /* addserverextra */
59 dtlssetsrcres, /* setsrcres */
60 initextradtls /* initextra */
63 static int client4_sock = -1;
64 static int client6_sock = -1;
65 static struct addrinfo *srcres = NULL;
66 static uint8_t handle;
68 const struct protodefs *dtlsinit(uint8_t h) {
73 struct sessioncacheentry {
74 pthread_mutex_t mutex;
76 struct timeval expiry;
79 struct dtlsservernewparams {
80 struct sessioncacheentry *sesscache;
82 struct sockaddr_storage addr;
85 void dtlssetsrcres(char *source) {
87 srcres = resolve_hostport_addrinfo(handle, source);
90 int udp2bio(int s, struct queue *q, int cnt) {
100 debug(DBG_ERR, "udp2bio: malloc failed");
105 cnt = recv(s, buf, cnt, 0);
107 debug(DBG_WARN, "udp2bio: recv failed");
112 rbio = BIO_new_mem_buf(buf, cnt);
113 BIO_set_mem_eof_return(rbio, -1);
115 pthread_mutex_lock(&q->mutex);
116 if (!list_push(q->entries, rbio)) {
118 pthread_mutex_unlock(&q->mutex);
121 pthread_cond_signal(&q->cond);
122 pthread_mutex_unlock(&q->mutex);
126 BIO *getrbio(SSL *ssl, struct queue *q, int timeout) {
131 pthread_mutex_lock(&q->mutex);
132 if (!(rbio = (BIO *)list_shift(q->entries))) {
134 gettimeofday(&now, NULL);
135 memset(&to, 0, sizeof(struct timespec));
136 to.tv_sec = now.tv_sec + timeout;
137 pthread_cond_timedwait(&q->cond, &q->mutex, &to);
139 pthread_cond_wait(&q->cond, &q->mutex);
140 rbio = (BIO *)list_shift(q->entries);
142 pthread_mutex_unlock(&q->mutex);
146 int dtlsread(SSL *ssl, struct queue *q, unsigned char *buf, int num, int timeout) {
150 for (len = 0; len < num; len += cnt) {
151 cnt = SSL_read(ssl, buf + len, num - len);
153 switch (cnt = SSL_get_error(ssl, cnt)) {
154 case SSL_ERROR_WANT_READ:
155 rbio = getrbio(ssl, q, timeout);
162 case SSL_ERROR_WANT_WRITE:
165 case SSL_ERROR_ZERO_RETURN:
166 /* remote end sent close_notify, send one back */
176 /* accept if acc == 1, else connect */
177 SSL *dtlsacccon(uint8_t acc, SSL_CTX *ctx, int s, struct sockaddr *addr, struct queue *rbios) {
187 mem0bio = BIO_new(BIO_s_mem());
188 BIO_set_mem_eof_return(mem0bio, -1);
189 wbio = BIO_new_dgram(s, BIO_NOCLOSE);
190 i = BIO_dgram_set_peer(wbio, addr); /* i just to avoid warning */
191 SSL_set_bio(ssl, mem0bio, wbio);
193 for (i = 0; i < 5; i++) {
194 res = acc ? SSL_accept(ssl) : SSL_connect(ssl);
199 if (SSL_get_error(ssl, res) == SSL_ERROR_WANT_READ) {
201 ssl->rbio = getrbio(ssl, rbios, 5);
205 while ((error = ERR_get_error()))
206 debug(DBG_ERR, "dtls%st: DTLS: %s", acc ? "accep" : "connec", ERR_error_string(error, NULL));
213 unsigned char *raddtlsget(SSL *ssl, struct queue *rbios, int timeout) {
215 unsigned char buf[4], *rad;
218 cnt = dtlsread(ssl, rbios, buf, 4, timeout);
220 debug(DBG_DBG, cnt ? "raddtlsget: connection lost" : "raddtlsget: timeout");
227 debug(DBG_ERR, "raddtlsget: malloc failed");
232 cnt = dtlsread(ssl, rbios, rad + 4, len - 4, timeout);
234 debug(DBG_DBG, cnt ? "raddtlsget: connection lost" : "raddtlsget: timeout");
243 debug(DBG_WARN, "raddtlsget: packet smaller than minimum radius size");
246 debug(DBG_DBG, "raddtlsget: got %d bytes", len);
250 void *dtlsserverwr(void *arg) {
253 struct client *client = (struct client *)arg;
254 struct queue *replyq;
255 struct request *reply;
257 debug(DBG_DBG, "dtlsserverwr: starting for %s", addr2string(client->addr));
258 replyq = client->replyq;
260 pthread_mutex_lock(&replyq->mutex);
261 while (!list_first(replyq->entries)) {
263 debug(DBG_DBG, "dtlsserverwr: waiting for signal");
264 pthread_cond_wait(&replyq->cond, &replyq->mutex);
265 debug(DBG_DBG, "dtlsserverwr: got signal");
268 /* ssl might have changed while waiting */
269 pthread_mutex_unlock(&replyq->mutex);
270 debug(DBG_DBG, "dtlsserverwr: exiting as requested");
275 reply = (struct request *)list_shift(replyq->entries);
276 pthread_mutex_unlock(&replyq->mutex);
277 cnt = SSL_write(client->ssl, reply->replybuf, RADLEN(reply->replybuf));
279 debug(DBG_DBG, "dtlsserverwr: sent %d bytes, Radius packet of length %d to %s",
280 cnt, RADLEN(reply->replybuf), addr2string(client->addr));
282 while ((error = ERR_get_error()))
283 debug(DBG_ERR, "dtlsserverwr: SSL: %s", ERR_error_string(error, NULL));
288 void dtlsserverrd(struct client *client) {
291 pthread_t dtlsserverwrth;
293 debug(DBG_DBG, "dtlsserverrd: starting for %s", addr2string(client->addr));
295 if (pthread_create(&dtlsserverwrth, NULL, dtlsserverwr, (void *)client)) {
296 debug(DBG_ERR, "dtlsserverrd: pthread_create failed");
301 buf = raddtlsget(client->ssl, client->rbios, IDLE_TIMEOUT);
303 debug(DBG_ERR, "dtlsserverrd: connection from %s lost", addr2string(client->addr));
306 debug(DBG_DBG, "dtlsserverrd: got Radius message from %s", addr2string(client->addr));
315 debug(DBG_ERR, "dtlsserverrd: message authentication/validation failed, closing connection from %s", addr2string(client->addr));
320 /* stop writer by setting ssl to NULL and give signal in case waiting for data */
323 pthread_mutex_lock(&client->replyq->mutex);
324 pthread_cond_signal(&client->replyq->cond);
325 pthread_mutex_unlock(&client->replyq->mutex);
326 debug(DBG_DBG, "dtlsserverrd: waiting for writer to end");
327 pthread_join(dtlsserverwrth, NULL);
328 debug(DBG_DBG, "dtlsserverrd: reader for %s exiting", addr2string(client->addr));
331 void *dtlsservernew(void *arg) {
332 struct dtlsservernewparams *params = (struct dtlsservernewparams *)arg;
333 struct client *client;
334 struct clsrvconf *conf;
335 struct list_node *cur = NULL;
341 debug(DBG_DBG, "dtlsservernew: starting");
342 conf = find_clconf(handle, (struct sockaddr *)¶ms->addr, NULL);
344 ctx = tlsgetctx(handle, conf->tlsconf);
347 ssl = dtlsacccon(1, ctx, params->sock, (struct sockaddr *)¶ms->addr, params->sesscache->rbios);
350 cert = verifytlscert(ssl);
356 if (verifyconfcert(cert, conf)) {
358 client = addclient(conf, 1);
360 client->sock = params->sock;
361 client->addr = addr_copy((struct sockaddr *)¶ms->addr);
362 client->rbios = params->sesscache->rbios;
364 dtlsserverrd(client);
365 removeclient(client);
368 debug(DBG_WARN, "dtlsservernew: failed to create new client instance");
372 conf = find_clconf(handle, (struct sockaddr *)¶ms->addr, &cur);
374 debug(DBG_WARN, "dtlsservernew: ignoring request, no matching TLS client");
384 pthread_mutex_lock(¶ms->sesscache->mutex);
385 freebios(params->sesscache->rbios);
386 params->sesscache->rbios = NULL;
387 gettimeofday(¶ms->sesscache->expiry, NULL);
388 params->sesscache->expiry.tv_sec += delay;
389 pthread_mutex_unlock(¶ms->sesscache->mutex);
393 debug(DBG_DBG, "dtlsservernew: exiting");
396 void cacheexpire(struct hash *cache, struct timeval *last) {
398 struct hash_entry *he;
399 struct sessioncacheentry *e;
401 gettimeofday(&now, NULL);
402 if (now.tv_sec - last->tv_sec < 19)
405 for (he = hash_first(cache); he; he = hash_next(he)) {
406 e = (struct sessioncacheentry *)he->data;
407 pthread_mutex_lock(&e->mutex);
408 if (!e->expiry.tv_sec || e->expiry.tv_sec > now.tv_sec) {
409 pthread_mutex_unlock(&e->mutex);
412 debug(DBG_DBG, "cacheexpire: freeing entry");
413 hash_extract(cache, he->key, he->keylen);
418 pthread_mutex_unlock(&e->mutex);
419 pthread_mutex_destroy(&e->mutex);
421 last->tv_sec = now.tv_sec;
424 void *udpdtlsserverrd(void *arg) {
425 int ndesc, cnt, s = *(int *)arg;
426 unsigned char buf[4];
427 struct sockaddr_storage from;
428 socklen_t fromlen = sizeof(from);
429 struct dtlsservernewparams *params;
431 struct timeval timeout, lastexpiry;
432 pthread_t dtlsserverth;
433 struct hash *sessioncache;
434 struct sessioncacheentry *cacheentry;
436 sessioncache = hash_create();
438 debugx(1, DBG_ERR, "udpdtlsserverrd: malloc failed");
439 gettimeofday(&lastexpiry, NULL);
444 memset(&timeout, 0, sizeof(struct timeval));
446 ndesc = select(s + 1, &readfds, NULL, NULL, &timeout);
448 cacheexpire(sessioncache, &lastexpiry);
451 cnt = recvfrom(s, buf, 4, MSG_PEEK | MSG_TRUNC, (struct sockaddr *)&from, &fromlen);
453 debug(DBG_WARN, "udpdtlsserverrd: recv failed");
454 cacheexpire(sessioncache, &lastexpiry);
457 cacheentry = hash_read(sessioncache, &from, fromlen);
459 debug(DBG_DBG, "udpdtlsserverrd: cache hit");
460 pthread_mutex_lock(&cacheentry->mutex);
461 if (cacheentry->rbios) {
462 if (udp2bio(s, cacheentry->rbios, cnt))
463 debug(DBG_DBG, "udpdtlsserverrd: got DTLS in UDP from %s", addr2string((struct sockaddr *)&from));
466 pthread_mutex_unlock(&cacheentry->mutex);
467 cacheexpire(sessioncache, &lastexpiry);
471 /* from new source */
472 debug(DBG_DBG, "udpdtlsserverrd: cache miss");
473 params = malloc(sizeof(struct dtlsservernewparams));
475 cacheexpire(sessioncache, &lastexpiry);
479 memset(params, 0, sizeof(struct dtlsservernewparams));
480 params->sesscache = malloc(sizeof(struct sessioncacheentry));
481 if (!params->sesscache) {
483 cacheexpire(sessioncache, &lastexpiry);
487 memset(params->sesscache, 0, sizeof(struct sessioncacheentry));
488 pthread_mutex_init(¶ms->sesscache->mutex, NULL);
489 params->sesscache->rbios = newqueue();
490 if (hash_insert(sessioncache, &from, fromlen, params->sesscache)) {
492 memcpy(¶ms->addr, &from, fromlen);
494 if (udp2bio(s, params->sesscache->rbios, cnt)) {
495 debug(DBG_DBG, "udpdtlsserverrd: got DTLS in UDP from %s", addr2string((struct sockaddr *)&from));
496 if (!pthread_create(&dtlsserverth, NULL, dtlsservernew, (void *)params)) {
497 pthread_detach(dtlsserverth);
498 cacheexpire(sessioncache, &lastexpiry);
501 debug(DBG_ERR, "udpdtlsserverrd: pthread_create failed");
503 hash_extract(sessioncache, &from, fromlen);
505 freebios(params->sesscache->rbios);
506 pthread_mutex_destroy(¶ms->sesscache->mutex);
507 free(params->sesscache);
509 cacheexpire(sessioncache, &lastexpiry);
513 int dtlsconnect(struct server *server, struct timeval *when, int timeout, char *text) {
519 debug(DBG_DBG, "dtlsconnect: called from %s", text);
520 pthread_mutex_lock(&server->lock);
521 if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) {
522 /* already reconnected, nothing to do */
523 debug(DBG_DBG, "dtlsconnect(%s): seems already reconnected", text);
524 pthread_mutex_unlock(&server->lock);
529 gettimeofday(&now, NULL);
530 elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
532 if (timeout && server->lastconnecttry.tv_sec && elapsed > timeout) {
533 debug(DBG_DBG, "dtlsconnect: timeout");
534 SSL_free(server->ssl);
536 pthread_mutex_unlock(&server->lock);
540 if (server->connectionok) {
541 server->connectionok = 0;
543 } else if (elapsed < 1)
545 else if (elapsed < 60) {
546 debug(DBG_INFO, "dtlsconnect: sleeping %lds", elapsed);
548 } else if (elapsed < 100000) {
549 debug(DBG_INFO, "dtlsconnect: sleeping %ds", 60);
552 server->lastconnecttry.tv_sec = now.tv_sec; /* no sleep at startup */
553 debug(DBG_WARN, "dtlsconnect: trying to open DTLS connection to %s port %s", server->conf->host, server->conf->port);
555 SSL_free(server->ssl);
557 ctx = tlsgetctx(handle, server->conf->tlsconf);
560 server->ssl = dtlsacccon(0, ctx, server->sock, server->conf->addrinfo->ai_addr, server->rbios);
563 debug(DBG_DBG, "dtlsconnect: DTLS: ok");
565 cert = verifytlscert(server->ssl);
569 if (verifyconfcert(cert, server->conf))
574 debug(DBG_WARN, "dtlsconnect: DTLS connection to %s port %s up", server->conf->host, server->conf->port);
575 server->connectionok = 1;
576 gettimeofday(&server->lastconnecttry, NULL);
577 pthread_mutex_unlock(&server->lock);
581 int clientradputdtls(struct server *server, unsigned char *rad) {
585 struct clsrvconf *conf = server->conf;
587 if (!server->connectionok)
590 if ((cnt = SSL_write(server->ssl, rad, len)) <= 0) {
591 while ((error = ERR_get_error()))
592 debug(DBG_ERR, "clientradputdtls: DTLS: %s", ERR_error_string(error, NULL));
595 debug(DBG_DBG, "clientradputdtls: Sent %d bytes, Radius packet of length %d to DTLS peer %s", cnt, len, conf->host);
599 /* reads UDP containing DTLS and passes it on to dtlsclientrd */
600 void *udpdtlsclientrd(void *arg) {
601 int cnt, s = *(int *)arg;
602 unsigned char buf[4];
603 struct sockaddr_storage from;
604 socklen_t fromlen = sizeof(from);
605 struct clsrvconf *conf;
611 if (select(s + 1, &readfds, NULL, NULL, NULL) < 1)
613 cnt = recvfrom(s, buf, 4, MSG_PEEK | MSG_TRUNC, (struct sockaddr *)&from, &fromlen);
615 debug(DBG_WARN, "udpdtlsclientrd: recv failed");
619 conf = find_srvconf(handle, (struct sockaddr *)&from, NULL);
621 debug(DBG_WARN, "udpdtlsclientrd: got packet from wrong or unknown DTLS peer %s, ignoring", addr2string((struct sockaddr *)&from));
625 if (udp2bio(s, conf->servers->rbios, cnt))
626 debug(DBG_DBG, "radudpget: got DTLS in UDP from %s", addr2string((struct sockaddr *)&from));
630 void *dtlsclientrd(void *arg) {
631 struct server *server = (struct server *)arg;
633 struct timeval lastconnecttry;
637 /* yes, lastconnecttry is really necessary */
638 lastconnecttry = server->lastconnecttry;
639 for (secs = 0; !(buf = raddtlsget(server->ssl, server->rbios, 10)) && !server->lostrqs && secs < IDLE_TIMEOUT; secs += 10);
641 dtlsconnect(server, &lastconnecttry, 0, "dtlsclientrd");
647 server->clientrdgone = 1;
651 void addserverextradtls(struct clsrvconf *conf) {
652 switch (conf->addrinfo->ai_family) {
654 if (client4_sock < 0) {
655 client4_sock = bindtoaddr(srcres, AF_INET, 0, 1);
656 if (client4_sock < 0)
657 debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->host);
659 conf->servers->sock = client4_sock;
662 if (client6_sock < 0) {
663 client6_sock = bindtoaddr(srcres, AF_INET6, 0, 1);
664 if (client6_sock < 0)
665 debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->host);
667 conf->servers->sock = client6_sock;
670 debugx(1, DBG_ERR, "addserver: unsupported address family");
674 void initextradtls() {
675 pthread_t cl4th, cl6th;
678 freeaddrinfo(srcres);
682 if (client4_sock >= 0)
683 if (pthread_create(&cl4th, NULL, udpdtlsclientrd, (void *)&client4_sock))
684 debugx(1, DBG_ERR, "pthread_create failed");
685 if (client6_sock >= 0)
686 if (pthread_create(&cl6th, NULL, udpdtlsclientrd, (void *)&client6_sock))
687 debugx(1, DBG_ERR, "pthread_create failed");