separated tls

git-svn-id: https://svn.testnett.uninett.no/radsecproxy/trunk@349 e88ac4ed-0b26-0410-9574-a7f39faa03bf

1 files changed, 399 insertions, 0 deletions

diff --git a/tls.c b/tls.c
new file mode 100644
index 0000000..ecbbbec
--- /dev/null
+++ b/tls.c
@@ -0,0 +1,399 @@
+/*
+ * Copyright (C) 2006-2008 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 "debug.h"
+#include "list.h"
+#include "util.h"
+#include "radsecproxy.h"
+#include "tls.h"
+
+int tlsconnect(struct server *server, struct timeval *when, int timeout, char *text) {
+    struct timeval now;
+    time_t elapsed;
+    X509 *cert;
+    unsigned long error;
+    
+    debug(DBG_DBG, "tlsconnect: 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, "tlsconnect(%s): seems already reconnected", text);
+	pthread_mutex_unlock(&server->lock);
+	return 1;
+    }
+
+    for (;;) {
+	gettimeofday(&now, NULL);
+	elapsed = now.tv_sec - server->lastconnecttry.tv_sec;
+	if (timeout && server->lastconnecttry.tv_sec && elapsed > timeout) {
+	    debug(DBG_DBG, "tlsconnect: timeout");
+	    if (server->sock >= 0)
+		close(server->sock);
+	    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, "tlsconnect: sleeping %lds", elapsed);
+	    sleep(elapsed);
+	} else if (elapsed < 100000) {
+	    debug(DBG_INFO, "tlsconnect: sleeping %ds", 60);
+	    sleep(60);
+	} else
+	    server->lastconnecttry.tv_sec = now.tv_sec;  /* no sleep at startup */
+	debug(DBG_WARN, "tlsconnect: trying to open TLS connection to %s port %s", server->conf->host, server->conf->port);
+	if (server->sock >= 0)
+	    close(server->sock);
+	if ((server->sock = connecttcp(server->conf->addrinfo, getsrcprotores(RAD_TLS))) < 0) {
+	    debug(DBG_ERR, "tlsconnect: connecttcp failed");
+	    continue;
+	}
+	
+	SSL_free(server->ssl);
+	server->ssl = SSL_new(server->conf->ssl_ctx);
+	SSL_set_fd(server->ssl, server->sock);
+	if (SSL_connect(server->ssl) <= 0) {
+	    while ((error = ERR_get_error()))
+		debug(DBG_ERR, "tlsconnect: TLS: %s", ERR_error_string(error, NULL));
+	    continue;
+	}
+	cert = verifytlscert(server->ssl);
+	if (!cert)
+	    continue;
+	if (verifyconfcert(cert, server->conf)) {
+	    X509_free(cert);
+	    break;
+	}
+	X509_free(cert);
+    }
+    debug(DBG_WARN, "tlsconnect: TLS connection to %s port %s up", server->conf->host, server->conf->port);
+    gettimeofday(&server->lastconnecttry, NULL);
+    pthread_mutex_unlock(&server->lock);
+    return 1;
+}
+
+/* timeout in seconds, 0 means no timeout (blocking), returns when num bytes have been read, or timeout */
+/* returns 0 on timeout, -1 on error and num if ok */
+int sslreadtimeout(SSL *ssl, unsigned char *buf, int num, int timeout) {
+    int s, ndesc, cnt, len;
+    fd_set readfds, writefds;
+    struct timeval timer;
+    
+    s = SSL_get_fd(ssl);
+    if (s < 0)
+	return -1;
+    /* make socket non-blocking? */
+    for (len = 0; len < num; len += cnt) {
+	FD_ZERO(&readfds);
+	FD_SET(s, &readfds);
+	writefds = readfds;
+	if (timeout) {
+	    timer.tv_sec = timeout;
+	    timer.tv_usec = 0;
+	}
+	ndesc = select(s + 1, &readfds, &writefds, NULL, timeout ? &timer : NULL);
+	if (ndesc < 1)
+	    return ndesc;
+
+	cnt = SSL_read(ssl, buf + len, num - len);
+	if (cnt <= 0)
+	    switch (SSL_get_error(ssl, cnt)) {
+	    case SSL_ERROR_WANT_READ:
+	    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;
+}
+
+/* timeout in seconds, 0 means no timeout (blocking) */
+unsigned char *radtlsget(SSL *ssl, int timeout) {
+    int cnt, len;
+    unsigned char buf[4], *rad;
+
+    for (;;) {
+	cnt = sslreadtimeout(ssl, buf, 4, timeout);
+	if (cnt < 1) {
+	    debug(DBG_DBG, cnt ? "radtlsget: connection lost" : "radtlsget: timeout");
+	    return NULL;
+	}
+
+	len = RADLEN(buf);
+	rad = malloc(len);
+	if (!rad) {
+	    debug(DBG_ERR, "radtlsget: malloc failed");
+	    continue;
+	}
+	memcpy(rad, buf, 4);
+	
+	cnt = sslreadtimeout(ssl, rad + 4, len - 4, timeout);
+	if (cnt < 1) {
+	    debug(DBG_DBG, cnt ? "radtlsget: connection lost" : "radtlsget: timeout");
+	    free(rad);
+	    return NULL;
+	}
+	
+	if (len >= 20)
+	    break;
+	
+	free(rad);
+	debug(DBG_WARN, "radtlsget: packet smaller than minimum radius size");
+    }
+    
+    debug(DBG_DBG, "radtlsget: got %d bytes", len);
+    return rad;
+}
+
+int clientradputtls(struct server *server, unsigned char *rad) {
+    int cnt;
+    size_t len;
+    unsigned long error;
+    struct timeval lastconnecttry;
+    struct clsrvconf *conf = server->conf;
+    
+    len = RADLEN(rad);
+    lastconnecttry = server->lastconnecttry;
+    while ((cnt = SSL_write(server->ssl, rad, len)) <= 0) {
+	while ((error = ERR_get_error()))
+	    debug(DBG_ERR, "clientradputtls: TLS: %s", ERR_error_string(error, NULL));
+	if (server->dynamiclookuparg)
+	    return 0;
+	tlsconnect(server, &lastconnecttry, 0, "clientradputtls");
+	lastconnecttry = server->lastconnecttry;
+    }
+
+    server->connectionok = 1;
+    debug(DBG_DBG, "clientradputtls: Sent %d bytes, Radius packet of length %d to TLS peer %s", cnt, len, conf->host);
+    return 1;
+}
+
+void *tlsclientrd(void *arg) {
+    struct server *server = (struct server *)arg;
+    unsigned char *buf;
+    struct timeval now, lastconnecttry;
+    
+    for (;;) {
+	/* yes, lastconnecttry is really necessary */
+	lastconnecttry = server->lastconnecttry;
+	buf = radtlsget(server->ssl, server->dynamiclookuparg ? IDLE_TIMEOUT : 0);
+	if (!buf) {
+	    if (server->dynamiclookuparg)
+		break;
+	    tlsconnect(server, &lastconnecttry, 0, "tlsclientrd");
+	    continue;
+	}
+
+	if (!replyh(server, buf))
+	    free(buf);
+	if (server->dynamiclookuparg) {
+	    gettimeofday(&now, NULL);
+	    if (now.tv_sec - server->lastreply.tv_sec > IDLE_TIMEOUT) {
+		debug(DBG_INFO, "tlsclientrd: idle timeout for %s", server->conf->name);
+		break;
+	    }
+	}
+    }
+    ERR_remove_state(0);
+    server->clientrdgone = 1;
+    return NULL;
+}
+
+void *tlsserverwr(void *arg) {
+    int cnt;
+    unsigned long error;
+    struct client *client = (struct client *)arg;
+    struct queue *replyq;
+    struct reply *reply;
+    
+    debug(DBG_DBG, "tlsserverwr: starting for %s", client->conf->host);
+    replyq = client->replyq;
+    for (;;) {
+	pthread_mutex_lock(&replyq->mutex);
+	while (!list_first(replyq->entries)) {
+	    if (client->ssl) {	    
+		debug(DBG_DBG, "tlsserverwr: waiting for signal");
+		pthread_cond_wait(&replyq->cond, &replyq->mutex);
+		debug(DBG_DBG, "tlsserverwr: got signal");
+	    }
+	    if (!client->ssl) {
+		/* ssl might have changed while waiting */
+		pthread_mutex_unlock(&replyq->mutex);
+		debug(DBG_DBG, "tlsserverwr: exiting as requested");
+		ERR_remove_state(0);
+		pthread_exit(NULL);
+	    }
+	}
+	reply = (struct reply *)list_shift(replyq->entries);
+	pthread_mutex_unlock(&replyq->mutex);
+	cnt = SSL_write(client->ssl, reply->buf, RADLEN(reply->buf));
+	if (cnt > 0)
+	    debug(DBG_DBG, "tlsserverwr: sent %d bytes, Radius packet of length %d",
+		  cnt, RADLEN(reply->buf));
+	else
+	    while ((error = ERR_get_error()))
+		debug(DBG_ERR, "tlsserverwr: SSL: %s", ERR_error_string(error, NULL));
+	free(reply->buf);
+	free(reply);
+    }
+}
+
+void tlsserverrd(struct client *client) {
+    struct request rq;
+    pthread_t tlsserverwrth;
+    
+    debug(DBG_DBG, "tlsserverrd: starting for %s", client->conf->host);
+    
+    if (pthread_create(&tlsserverwrth, NULL, tlsserverwr, (void *)client)) {
+	debug(DBG_ERR, "tlsserverrd: pthread_create failed");
+	return;
+    }
+
+    for (;;) {
+	memset(&rq, 0, sizeof(struct request));
+	rq.buf = radtlsget(client->ssl, 0);
+	if (!rq.buf) {
+	    debug(DBG_ERR, "tlsserverrd: connection from %s lost", client->conf->host);
+	    break;
+	}
+	debug(DBG_DBG, "tlsserverrd: got Radius message from %s", client->conf->host);
+	rq.from = client;
+	if (!radsrv(&rq)) {
+	    debug(DBG_ERR, "tlsserverrd: message authentication/validation failed, closing connection from %s", client->conf->host);
+	    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, "tlsserverrd: waiting for writer to end");
+    pthread_join(tlsserverwrth, NULL);
+    removeclientrqs(client);
+    debug(DBG_DBG, "tlsserverrd: reader for %s exiting", client->conf->host);
+}
+
+void *tlsservernew(void *arg) {
+    int s;
+    struct sockaddr_storage from;
+    size_t fromlen = sizeof(from);
+    struct clsrvconf *conf;
+    struct list_node *cur = NULL;
+    SSL *ssl = NULL;
+    X509 *cert = NULL;
+    unsigned long error;
+    struct client *client;
+
+    s = *(int *)arg;
+    if (getpeername(s, (struct sockaddr *)&from, &fromlen)) {
+	debug(DBG_DBG, "tlsservernew: getpeername failed, exiting");
+	goto exit;
+    }
+    debug(DBG_WARN, "tlsservernew: incoming TLS connection from %s", addr2string((struct sockaddr *)&from, fromlen));
+
+    conf = find_clconf(RAD_TLS, (struct sockaddr *)&from, &cur);
+    if (conf) {
+	ssl = SSL_new(conf->ssl_ctx);
+	SSL_set_fd(ssl, s);
+
+	if (SSL_accept(ssl) <= 0) {
+	    while ((error = ERR_get_error()))
+		debug(DBG_ERR, "tlsservernew: SSL: %s", ERR_error_string(error, NULL));
+	    debug(DBG_ERR, "tlsservernew: SSL_accept failed");
+	    goto exit;
+	}
+	cert = verifytlscert(ssl);
+	if (!cert)
+	    goto exit;
+    }
+    
+    while (conf) {
+	if (verifyconfcert(cert, conf)) {
+	    X509_free(cert);
+	    client = addclient(conf);
+	    if (client) {
+		client->ssl = ssl;
+		tlsserverrd(client);
+		removeclient(client);
+	    } else
+		debug(DBG_WARN, "tlsservernew: failed to create new client instance");
+	    goto exit;
+	}
+	conf = find_clconf(RAD_TLS, (struct sockaddr *)&from, &cur);
+    }
+    debug(DBG_WARN, "tlsservernew: ignoring request, no matching TLS client");
+    if (cert)
+	X509_free(cert);
+
+ exit:
+    SSL_free(ssl);
+    ERR_remove_state(0);
+    shutdown(s, SHUT_RDWR);
+    close(s);
+    pthread_exit(NULL);
+}
+
+void *tlslistener(void *arg) {
+    pthread_t tlsserverth;
+    int s, *sp = (int *)arg;
+    struct sockaddr_storage from;
+    size_t fromlen = sizeof(from);
+
+    listen(*sp, 0);
+
+    for (;;) {
+	s = accept(*sp, (struct sockaddr *)&from, &fromlen);
+	if (s < 0) {
+	    debug(DBG_WARN, "accept failed");
+	    continue;
+	}
+	if (pthread_create(&tlsserverth, NULL, tlsservernew, (void *)&s)) {
+	    debug(DBG_ERR, "tlslistener: pthread_create failed");
+	    shutdown(s, SHUT_RDWR);
+	    close(s);
+	    continue;
+	}
+	pthread_detach(tlsserverth);
+    }
+    free(sp);
+    return NULL;
+}