diff options
Diffstat (limited to 'dtls.c')
| -rw-r--r-- | dtls.c | 715 |
1 files changed, 0 insertions, 715 deletions
@@ -1,715 +0,0 @@ -/* - * Copyright (C) 2008-2009 Stig Venaas <venaas@uninett.no> - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - */ - -#include <signal.h> -#include <sys/socket.h> -#include <netinet/in.h> -#include <netdb.h> -#include <string.h> -#include <unistd.h> -#include <limits.h> -#ifdef SYS_SOLARIS9 -#include <fcntl.h> -#endif -#include <sys/time.h> -#include <sys/types.h> -#include <sys/select.h> -#include <ctype.h> -#include <sys/wait.h> -#include <arpa/inet.h> -#include <regex.h> -#include <pthread.h> -#include <openssl/ssl.h> -#include <openssl/err.h> -#include "list.h" -#include "hash.h" -#include "radsecproxy.h" - -#ifdef RADPROT_DTLS -#include "debug.h" -#include "util.h" -#include "hostport.h" - -static void setprotoopts(struct commonprotoopts *opts); -static char **getlistenerargs(); -void *udpdtlsserverrd(void *arg); -int dtlsconnect(struct server *server, struct timeval *when, int timeout, char *text); -void *dtlsclientrd(void *arg); -int clientradputdtls(struct server *server, unsigned char *rad); -void addserverextradtls(struct clsrvconf *conf); -void dtlssetsrcres(); -void initextradtls(); - -static const struct protodefs protodefs = { - "dtls", - "mysecret", /* secretdefault */ - SOCK_DGRAM, /* socktype */ - "2083", /* portdefault */ - REQUEST_RETRY_COUNT, /* retrycountdefault */ - 10, /* retrycountmax */ - REQUEST_RETRY_INTERVAL, /* retryintervaldefault */ - 60, /* retryintervalmax */ - DUPLICATE_INTERVAL, /* duplicateintervaldefault */ - setprotoopts, /* setprotoopts */ - getlistenerargs, /* getlistenerargs */ - udpdtlsserverrd, /* listener */ - dtlsconnect, /* connecter */ - dtlsclientrd, /* clientconnreader */ - clientradputdtls, /* clientradput */ - NULL, /* addclient */ - addserverextradtls, /* addserverextra */ - dtlssetsrcres, /* setsrcres */ - initextradtls /* initextra */ -}; - -static int client4_sock = -1; -static int client6_sock = -1; -static struct addrinfo *srcres = NULL; -static uint8_t handle; -static struct commonprotoopts *protoopts = NULL; - -const struct protodefs *dtlsinit(uint8_t h) { - handle = h; - return &protodefs; -} - -static void setprotoopts(struct commonprotoopts *opts) { - protoopts = opts; -} - -static char **getlistenerargs() { - return protoopts ? protoopts->listenargs : NULL; -} - -struct sessioncacheentry { - pthread_mutex_t mutex; - struct gqueue *rbios; - struct timeval expiry; -}; - -struct dtlsservernewparams { - struct sessioncacheentry *sesscache; - int sock; - struct sockaddr_storage addr; -}; - -void dtlssetsrcres() { - if (!srcres) - srcres = resolvepassiveaddrinfo(protoopts ? protoopts->sourcearg : NULL, NULL, protodefs.socktype); -} - -int udp2bio(int s, struct gqueue *q, int cnt) { - unsigned char *buf; - BIO *rbio; - - if (cnt < 1) - return 0; - - buf = malloc(cnt); - if (!buf) { - unsigned char err; - debug(DBG_ERR, "udp2bio: malloc failed"); - recv(s, &err, 1, 0); - return 0; - } - - cnt = recv(s, buf, cnt, 0); - if (cnt < 1) { - debug(DBG_WARN, "udp2bio: recv failed"); - free(buf); - return 0; - } - - rbio = BIO_new_mem_buf(buf, cnt); - BIO_set_mem_eof_return(rbio, -1); - - pthread_mutex_lock(&q->mutex); - if (!list_push(q->entries, rbio)) { - BIO_free(rbio); - pthread_mutex_unlock(&q->mutex); - return 0; - } - pthread_cond_signal(&q->cond); - pthread_mutex_unlock(&q->mutex); - return 1; -} - -BIO *getrbio(SSL *ssl, struct gqueue *q, int timeout) { - BIO *rbio; - struct timeval now; - struct timespec to; - - pthread_mutex_lock(&q->mutex); - if (!(rbio = (BIO *)list_shift(q->entries))) { - if (timeout) { - gettimeofday(&now, NULL); - memset(&to, 0, sizeof(struct timespec)); - to.tv_sec = now.tv_sec + timeout; - pthread_cond_timedwait(&q->cond, &q->mutex, &to); - } else - pthread_cond_wait(&q->cond, &q->mutex); - rbio = (BIO *)list_shift(q->entries); - } - pthread_mutex_unlock(&q->mutex); - return rbio; -} - -int dtlsread(SSL *ssl, struct gqueue *q, unsigned char *buf, int num, int timeout) { - int len, cnt; - BIO *rbio; - - for (len = 0; len < num; len += cnt) { - cnt = SSL_read(ssl, buf + len, num - len); - if (cnt <= 0) - switch (cnt = SSL_get_error(ssl, cnt)) { - case SSL_ERROR_WANT_READ: - rbio = getrbio(ssl, q, timeout); - if (!rbio) - return 0; - BIO_free(ssl->rbio); - ssl->rbio = rbio; - cnt = 0; - continue; - case SSL_ERROR_WANT_WRITE: - cnt = 0; - continue; - case SSL_ERROR_ZERO_RETURN: - /* remote end sent close_notify, send one back */ - SSL_shutdown(ssl); - return -1; - default: - return -1; - } - } - return num; -} - -/* accept if acc == 1, else connect */ -SSL *dtlsacccon(uint8_t acc, SSL_CTX *ctx, int s, struct sockaddr *addr, struct gqueue *rbios) { - SSL *ssl; - int i, res; - unsigned long error; - BIO *mem0bio, *wbio; - - ssl = SSL_new(ctx); - if (!ssl) - return NULL; - - mem0bio = BIO_new(BIO_s_mem()); - BIO_set_mem_eof_return(mem0bio, -1); - wbio = BIO_new_dgram(s, BIO_NOCLOSE); - i = BIO_dgram_set_peer(wbio, addr); /* i just to avoid warning */ - SSL_set_bio(ssl, mem0bio, wbio); - - for (i = 0; i < 5; i++) { - res = acc ? SSL_accept(ssl) : SSL_connect(ssl); - if (res > 0) - return ssl; - if (res == 0) - break; - if (SSL_get_error(ssl, res) == SSL_ERROR_WANT_READ) { - BIO_free(ssl->rbio); - ssl->rbio = getrbio(ssl, rbios, 5); - if (!ssl->rbio) - break; - } - while ((error = ERR_get_error())) - debug(DBG_ERR, "dtls%st: DTLS: %s", acc ? "accep" : "connec", ERR_error_string(error, NULL)); - } - - SSL_free(ssl); - return NULL; -} - -unsigned char *raddtlsget(SSL *ssl, struct gqueue *rbios, int timeout) { - int cnt, len; - unsigned char buf[4], *rad; - - for (;;) { - cnt = dtlsread(ssl, rbios, buf, 4, timeout); - if (cnt < 1) { - debug(DBG_DBG, cnt ? "raddtlsget: connection lost" : "raddtlsget: timeout"); - return NULL; - } - - len = RADLEN(buf); - rad = malloc(len); - if (!rad) { - debug(DBG_ERR, "raddtlsget: malloc failed"); - continue; - } - memcpy(rad, buf, 4); - - cnt = dtlsread(ssl, rbios, rad + 4, len - 4, timeout); - if (cnt < 1) { - debug(DBG_DBG, cnt ? "raddtlsget: connection lost" : "raddtlsget: timeout"); - free(rad); - return NULL; - } - - if (len >= 20) - break; - - free(rad); - debug(DBG_WARN, "raddtlsget: packet smaller than minimum radius size"); - } - - debug(DBG_DBG, "raddtlsget: got %d bytes", len); - return rad; -} - -void *dtlsserverwr(void *arg) { - int cnt; - unsigned long error; - struct client *client = (struct client *)arg; - struct gqueue *replyq; - struct request *reply; - - debug(DBG_DBG, "dtlsserverwr: starting for %s", addr2string(client->addr)); - replyq = client->replyq; - for (;;) { - pthread_mutex_lock(&replyq->mutex); - while (!list_first(replyq->entries)) { - if (client->ssl) { - debug(DBG_DBG, "dtlsserverwr: waiting for signal"); - pthread_cond_wait(&replyq->cond, &replyq->mutex); - debug(DBG_DBG, "dtlsserverwr: got signal"); - } - if (!client->ssl) { - /* ssl might have changed while waiting */ - pthread_mutex_unlock(&replyq->mutex); - debug(DBG_DBG, "dtlsserverwr: exiting as requested"); - ERR_remove_state(0); - pthread_exit(NULL); - } - } - reply = (struct request *)list_shift(replyq->entries); - pthread_mutex_unlock(&replyq->mutex); - cnt = SSL_write(client->ssl, reply->replybuf, RADLEN(reply->replybuf)); - if (cnt > 0) - debug(DBG_DBG, "dtlsserverwr: sent %d bytes, Radius packet of length %d to %s", - cnt, RADLEN(reply->replybuf), addr2string(client->addr)); - else - while ((error = ERR_get_error())) - debug(DBG_ERR, "dtlsserverwr: SSL: %s", ERR_error_string(error, NULL)); - freerq(reply); - } -} - -void dtlsserverrd(struct client *client) { - struct request *rq; - uint8_t *buf; - pthread_t dtlsserverwrth; - - debug(DBG_DBG, "dtlsserverrd: starting for %s", addr2string(client->addr)); - - if (pthread_create(&dtlsserverwrth, NULL, dtlsserverwr, (void *)client)) { - debug(DBG_ERR, "dtlsserverrd: pthread_create failed"); - return; - } - - for (;;) { - buf = raddtlsget(client->ssl, client->rbios, IDLE_TIMEOUT); - if (!buf) { - debug(DBG_ERR, "dtlsserverrd: connection from %s lost", addr2string(client->addr)); - break; - } - debug(DBG_DBG, "dtlsserverrd: got Radius message from %s", addr2string(client->addr)); - rq = newrequest(); - if (!rq) { - free(buf); - continue; - } - rq->buf = buf; - rq->from = client; - if (!radsrv(rq)) { - debug(DBG_ERR, "dtlsserverrd: message authentication/validation failed, closing connection from %s", addr2string(client->addr)); - break; - } - } - - /* stop writer by setting ssl to NULL and give signal in case waiting for data */ - client->ssl = NULL; - - pthread_mutex_lock(&client->replyq->mutex); - pthread_cond_signal(&client->replyq->cond); - pthread_mutex_unlock(&client->replyq->mutex); - debug(DBG_DBG, "dtlsserverrd: waiting for writer to end"); - pthread_join(dtlsserverwrth, NULL); - debug(DBG_DBG, "dtlsserverrd: reader for %s exiting", addr2string(client->addr)); -} - -void *dtlsservernew(void *arg) { - struct dtlsservernewparams *params = (struct dtlsservernewparams *)arg; - struct client *client; - struct clsrvconf *conf; - struct list_node *cur = NULL; - SSL *ssl = NULL; - X509 *cert = NULL; - SSL_CTX *ctx = NULL; - uint8_t delay = 60; - - debug(DBG_DBG, "dtlsservernew: starting"); - conf = find_clconf(handle, (struct sockaddr *)¶ms->addr, NULL); - if (conf) { - ctx = tlsgetctx(handle, conf->tlsconf); - if (!ctx) - goto exit; - ssl = dtlsacccon(1, ctx, params->sock, (struct sockaddr *)¶ms->addr, params->sesscache->rbios); - if (!ssl) - goto exit; - cert = verifytlscert(ssl); - if (!cert) - goto exit; - } - - while (conf) { - if (verifyconfcert(cert, conf)) { - X509_free(cert); - client = addclient(conf, 1); - if (client) { - client->sock = params->sock; - client->addr = addr_copy((struct sockaddr *)¶ms->addr); - client->rbios = params->sesscache->rbios; - client->ssl = ssl; - dtlsserverrd(client); - removeclient(client); - delay = 0; - } else { - debug(DBG_WARN, "dtlsservernew: failed to create new client instance"); - } - goto exit; - } - conf = find_clconf(handle, (struct sockaddr *)¶ms->addr, &cur); - } - debug(DBG_WARN, "dtlsservernew: ignoring request, no matching TLS client"); - - if (cert) - X509_free(cert); - -exit: - if (ssl) { - SSL_shutdown(ssl); - SSL_free(ssl); - } - pthread_mutex_lock(¶ms->sesscache->mutex); - freebios(params->sesscache->rbios); - params->sesscache->rbios = NULL; - gettimeofday(¶ms->sesscache->expiry, NULL); - params->sesscache->expiry.tv_sec += delay; - pthread_mutex_unlock(¶ms->sesscache->mutex); - free(params); - ERR_remove_state(0); - pthread_exit(NULL); - debug(DBG_DBG, "dtlsservernew: exiting"); -} - -void cacheexpire(struct hash *cache, struct timeval *last) { - struct timeval now; - struct hash_entry *he; - struct sessioncacheentry *e; - - gettimeofday(&now, NULL); - if (now.tv_sec - last->tv_sec < 19) - return; - - for (he = hash_first(cache); he; he = hash_next(he)) { - e = (struct sessioncacheentry *)he->data; - pthread_mutex_lock(&e->mutex); - if (!e->expiry.tv_sec || e->expiry.tv_sec > now.tv_sec) { - pthread_mutex_unlock(&e->mutex); - continue; - } - debug(DBG_DBG, "cacheexpire: freeing entry"); - hash_extract(cache, he->key, he->keylen); - if (e->rbios) { - freebios(e->rbios); - e->rbios = NULL; - } - pthread_mutex_unlock(&e->mutex); - pthread_mutex_destroy(&e->mutex); - } - last->tv_sec = now.tv_sec; -} - -void *udpdtlsserverrd(void *arg) { - int ndesc, cnt, s = *(int *)arg; - unsigned char buf[4]; - struct sockaddr_storage from; - socklen_t fromlen = sizeof(from); - struct dtlsservernewparams *params; - fd_set readfds; - struct timeval timeout, lastexpiry; - pthread_t dtlsserverth; - struct hash *sessioncache; - struct sessioncacheentry *cacheentry; - - sessioncache = hash_create(); - if (!sessioncache) - debugx(1, DBG_ERR, "udpdtlsserverrd: malloc failed"); - gettimeofday(&lastexpiry, NULL); - - for (;;) { - FD_ZERO(&readfds); - FD_SET(s, &readfds); - memset(&timeout, 0, sizeof(struct timeval)); - timeout.tv_sec = 60; - ndesc = select(s + 1, &readfds, NULL, NULL, &timeout); - if (ndesc < 1) { - cacheexpire(sessioncache, &lastexpiry); - continue; - } - cnt = recvfrom(s, buf, 4, MSG_PEEK | MSG_TRUNC, (struct sockaddr *)&from, &fromlen); - if (cnt == -1) { - debug(DBG_WARN, "udpdtlsserverrd: recv failed"); - cacheexpire(sessioncache, &lastexpiry); - continue; - } - cacheentry = hash_read(sessioncache, &from, fromlen); - if (cacheentry) { - debug(DBG_DBG, "udpdtlsserverrd: cache hit"); - pthread_mutex_lock(&cacheentry->mutex); - if (cacheentry->rbios) { - if (udp2bio(s, cacheentry->rbios, cnt)) - debug(DBG_DBG, "udpdtlsserverrd: got DTLS in UDP from %s", addr2string((struct sockaddr *)&from)); - } else - recv(s, buf, 1, 0); - pthread_mutex_unlock(&cacheentry->mutex); - cacheexpire(sessioncache, &lastexpiry); - continue; - } - - /* from new source */ - debug(DBG_DBG, "udpdtlsserverrd: cache miss"); - params = malloc(sizeof(struct dtlsservernewparams)); - if (!params) { - cacheexpire(sessioncache, &lastexpiry); - recv(s, buf, 1, 0); - continue; - } - memset(params, 0, sizeof(struct dtlsservernewparams)); - params->sesscache = malloc(sizeof(struct sessioncacheentry)); - if (!params->sesscache) { - free(params); - cacheexpire(sessioncache, &lastexpiry); - recv(s, buf, 1, 0); - continue; - } - memset(params->sesscache, 0, sizeof(struct sessioncacheentry)); - pthread_mutex_init(¶ms->sesscache->mutex, NULL); - params->sesscache->rbios = newqueue(); - if (hash_insert(sessioncache, &from, fromlen, params->sesscache)) { - params->sock = s; - memcpy(¶ms->addr, &from, fromlen); - - if (udp2bio(s, params->sesscache->rbios, cnt)) { - debug(DBG_DBG, "udpdtlsserverrd: got DTLS in UDP from %s", addr2string((struct sockaddr *)&from)); - if (!pthread_create(&dtlsserverth, NULL, dtlsservernew, (void *)params)) { - pthread_detach(dtlsserverth); - cacheexpire(sessioncache, &lastexpiry); - continue; - } - debug(DBG_ERR, "udpdtlsserverrd: pthread_create failed"); - } - hash_extract(sessioncache, &from, fromlen); - } - freebios(params->sesscache->rbios); - pthread_mutex_destroy(¶ms->sesscache->mutex); - free(params->sesscache); - free(params); - cacheexpire(sessioncache, &lastexpiry); - } -} - -int dtlsconnect(struct server *server, struct timeval *when, int timeout, char *text) { - struct timeval now; - time_t elapsed; - X509 *cert; - SSL_CTX *ctx = NULL; - struct hostportres *hp; - - debug(DBG_DBG, "dtlsconnect: called from %s", text); - pthread_mutex_lock(&server->lock); - if (when && memcmp(&server->lastconnecttry, when, sizeof(struct timeval))) { - /* already reconnected, nothing to do */ - debug(DBG_DBG, "dtlsconnect(%s): seems already reconnected", text); - pthread_mutex_unlock(&server->lock); - return 1; - } - - hp = (struct hostportres *)list_first(server->conf->hostports)->data; - for (;;) { - gettimeofday(&now, NULL); - elapsed = now.tv_sec - server->lastconnecttry.tv_sec; - - if (timeout && server->lastconnecttry.tv_sec && elapsed > timeout) { - debug(DBG_DBG, "dtlsconnect: timeout"); - SSL_free(server->ssl); - server->ssl = NULL; - pthread_mutex_unlock(&server->lock); - return 0; - } - - if (server->connectionok) { - server->connectionok = 0; - sleep(2); - } else if (elapsed < 1) - sleep(2); - else if (elapsed < 60) { - debug(DBG_INFO, "dtlsconnect: sleeping %lds", elapsed); - sleep(elapsed); - } else if (elapsed < 100000) { - debug(DBG_INFO, "dtlsconnect: sleeping %ds", 60); - sleep(60); - } else - server->lastconnecttry.tv_sec = now.tv_sec; /* no sleep at startup */ - debug(DBG_WARN, "dtlsconnect: trying to open DTLS connection to %s port %s", hp->host, hp->port); - - SSL_free(server->ssl); - server->ssl = NULL; - ctx = tlsgetctx(handle, server->conf->tlsconf); - if (!ctx) - continue; - server->ssl = dtlsacccon(0, ctx, server->sock, hp->addrinfo->ai_addr, server->rbios); - if (!server->ssl) - continue; - debug(DBG_DBG, "dtlsconnect: DTLS: ok"); - - cert = verifytlscert(server->ssl); - if (!cert) - continue; - - if (verifyconfcert(cert, server->conf)) - break; - X509_free(cert); - } - X509_free(cert); - debug(DBG_WARN, "dtlsconnect: DTLS connection to %s port %s up", hp->host, hp->port); - server->connectionok = 1; - gettimeofday(&server->lastconnecttry, NULL); - pthread_mutex_unlock(&server->lock); - return 1; -} - -int clientradputdtls(struct server *server, unsigned char *rad) { - int cnt; - size_t len; - unsigned long error; - struct clsrvconf *conf = server->conf; - - if (!server->connectionok) - return 0; - len = RADLEN(rad); - if ((cnt = SSL_write(server->ssl, rad, len)) <= 0) { - while ((error = ERR_get_error())) - debug(DBG_ERR, "clientradputdtls: DTLS: %s", ERR_error_string(error, NULL)); - return 0; - } - debug(DBG_DBG, "clientradputdtls: Sent %d bytes, Radius packet of length %d to DTLS peer %s", cnt, len, conf->name); - return 1; -} - -/* reads UDP containing DTLS and passes it on to dtlsclientrd */ -void *udpdtlsclientrd(void *arg) { - int cnt, s = *(int *)arg; - unsigned char buf[4]; - struct sockaddr_storage from; - socklen_t fromlen = sizeof(from); - struct clsrvconf *conf; - fd_set readfds; - - for (;;) { - FD_ZERO(&readfds); - FD_SET(s, &readfds); - if (select(s + 1, &readfds, NULL, NULL, NULL) < 1) - continue; - cnt = recvfrom(s, buf, 4, MSG_PEEK | MSG_TRUNC, (struct sockaddr *)&from, &fromlen); - if (cnt == -1) { - debug(DBG_WARN, "udpdtlsclientrd: recv failed"); - continue; - } - - conf = find_srvconf(handle, (struct sockaddr *)&from, NULL); - if (!conf) { - debug(DBG_WARN, "udpdtlsclientrd: got packet from wrong or unknown DTLS peer %s, ignoring", addr2string((struct sockaddr *)&from)); - recv(s, buf, 4, 0); - continue; - } - if (udp2bio(s, conf->servers->rbios, cnt)) - debug(DBG_DBG, "radudpget: got DTLS in UDP from %s", addr2string((struct sockaddr *)&from)); - } -} - -void *dtlsclientrd(void *arg) { - struct server *server = (struct server *)arg; - unsigned char *buf; - struct timeval lastconnecttry; - int secs; - - for (;;) { - /* yes, lastconnecttry is really necessary */ - lastconnecttry = server->lastconnecttry; - for (secs = 0; !(buf = raddtlsget(server->ssl, server->rbios, 10)) && !server->lostrqs && secs < IDLE_TIMEOUT; secs += 10); - if (!buf) { - dtlsconnect(server, &lastconnecttry, 0, "dtlsclientrd"); - continue; - } - replyh(server, buf); - } - ERR_remove_state(0); - server->clientrdgone = 1; - return NULL; -} - -void addserverextradtls(struct clsrvconf *conf) { - switch (((struct hostportres *)list_first(conf->hostports)->data)->addrinfo->ai_family) { - case AF_INET: - if (client4_sock < 0) { - client4_sock = bindtoaddr(srcres, AF_INET, 0, 1); - if (client4_sock < 0) - debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->name); - } - conf->servers->sock = client4_sock; - break; - case AF_INET6: - if (client6_sock < 0) { - client6_sock = bindtoaddr(srcres, AF_INET6, 0, 1); - if (client6_sock < 0) - debugx(1, DBG_ERR, "addserver: failed to create client socket for server %s", conf->name); - } - conf->servers->sock = client6_sock; - break; - default: - debugx(1, DBG_ERR, "addserver: unsupported address family"); - } -} - -void initextradtls() { - pthread_t cl4th, cl6th; - - if (srcres) { - freeaddrinfo(srcres); - srcres = NULL; - } - - if (client4_sock >= 0) - if (pthread_create(&cl4th, NULL, udpdtlsclientrd, (void *)&client4_sock)) - debugx(1, DBG_ERR, "pthread_create failed"); - if (client6_sock >= 0) - if (pthread_create(&cl6th, NULL, udpdtlsclientrd, (void *)&client6_sock)) - debugx(1, DBG_ERR, "pthread_create failed"); -} -#else -const struct protodefs *dtlsinit(uint8_t h) { - return NULL; -} -#endif - -/* Local Variables: */ -/* c-file-style: "stroustrup" */ -/* End: */ |