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/*
* 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 "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",
"radsec", /* 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,
AF_UNSPEC, 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, &pthread_attr, 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;
struct tls *accepted_tls = NULL;
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;
accepted_tls = conf->tlsconf;
}
while (conf) {
if (accepted_tls == conf->tlsconf && 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, &pthread_attr, 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, &pthread_attr, udpdtlsclientrd, (void *)&client4_sock))
debugx(1, DBG_ERR, "pthread_create failed");
if (client6_sock >= 0)
if (pthread_create(&cl6th, &pthread_attr, 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: */
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