X-Git-Url: http://git.sameswireless.fr/l2tpns.git/blobdiff_plain/272e831e8071da5296e8dd2061f8a166fd70fd07..455e310268d21eb9487b3487efbbe24946a0c5de:/l2tpns.c?ds=inline

diff --git a/l2tpns.c b/l2tpns.c
index eb7783b..dfa88f8 100644
--- a/l2tpns.c
+++ b/l2tpns.c
@@ -4,7 +4,7 @@
 // Copyright (c) 2002 FireBrick (Andrews & Arnold Ltd / Watchfront Ltd) - GPL licenced
 // vim: sw=8 ts=8
 
-char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.25 2004/09/02 04:18:07 fred_nerk Exp $";
+char const *cvs_id_l2tpns = "$Id: l2tpns.c,v 1.36 2004/10/30 07:17:41 bodea Exp $";
 
 #include <arpa/inet.h>
 #include <assert.h>
@@ -101,13 +101,14 @@ struct config_descriptt config_values[] = {
 	CONFIG("save_state", save_state, BOOL),
 	CONFIG("primary_radius", radiusserver[0], IP),
 	CONFIG("secondary_radius", radiusserver[1], IP),
-	CONFIG("primary_radius_port",radiusport[0], SHORT),
-	CONFIG("secondary_radius_port",radiusport[1], SHORT),
+	CONFIG("primary_radius_port", radiusport[0], SHORT),
+	CONFIG("secondary_radius_port", radiusport[1], SHORT),
 	CONFIG("radius_accounting", radius_accounting, BOOL),
 	CONFIG("radius_secret", radiussecret, STRING),
 	CONFIG("bind_address", bind_address, IP),
 	CONFIG("send_garp", send_garp, BOOL),
 	CONFIG("throttle_speed", rl_rate, UNSIGNED_LONG),
+	CONFIG("throttle_buckets", num_tbfs, INT),
 	CONFIG("accounting_dir", accounting_dir, STRING),
 	CONFIG("setuid", target_uid, INT),
 	CONFIG("dump_speed", dump_speed, BOOL),
@@ -169,6 +170,7 @@ void dump_state();
 void tunnel_clean();
 tunnelidt new_tunnel();
 void update_config();
+int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length);
 
 static void cache_ipmap(ipt ip, int s);
 static void uncache_ipmap(ipt ip);
@@ -1452,6 +1454,13 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
 						continue;
 					}
 					log(4, ntohl(addr->sin_addr.s_addr), s, t, "Hidden AVP\n");
+					// Unhide the AVP
+					n = unhide_avp(b, t, s, n);
+					if (n == 0)
+					{
+						fatal = flags;
+						continue;
+					}
 				}
 				if (*b & 0x3C)
 				{
@@ -1566,6 +1575,11 @@ void processudp(u8 * buf, int len, struct sockaddr_in *addr)
 						build_chap_response(b, 2, n, &chapresponse);
 					}
 					break;
+				case 13:    // Response
+					// Why did they send a response? We never challenge.
+					log(2, ntohl(addr->sin_addr.s_addr), s, t, "   received unexpected challenge response\n");
+				break;
+
 				case 14:    // assigned session
 					asession = session[s].far = ntohs(*(u16 *) (b));
 					log(4, ntohl(addr->sin_addr.s_addr), s, t, "   assigned session = %d\n", asession);
@@ -2167,7 +2181,7 @@ int regular_cleanups(void)
 		}
 	}
 
-	if (config->accounting_dir && next_acct <= TIME)
+	if (*config->accounting_dir && next_acct <= TIME)
 	{
 		// Dump accounting data
 		next_acct = TIME + ACCT_TIME;
@@ -2207,8 +2221,8 @@ int still_busy(void)
 		return 1;
 	}
 
-	// We stop waiting for radius after BUSY_WAIT_TIMEOUT 1/10th seconds
-	if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIMEOUT)
+	// We stop waiting for radius after BUSY_WAIT_TIME 1/10th seconds
+	if (abs(TIME - start_busy_wait) > BUSY_WAIT_TIME)
 	{
 		log(1, 0, 0, 0, "Giving up waiting for RADIUS to be empty. Shutting down anyway.\n");
 		return 0;
@@ -2347,14 +2361,17 @@ void mainloop(void)
 			for (i = 0; i < config->num_radfds; i++)
 				if (FD_ISSET(radfds[i], &r))
 					processrad(buf, recv(radfds[i], buf, sizeof(buf), 0), i);
+
 			if (FD_ISSET(cluster_sockfd, &r))
 			{
 				int size;
 				size = recvfrom(cluster_sockfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen);
 				processcluster(buf, size, addr.sin_addr.s_addr);
 			}
+
 			if (FD_ISSET(controlfd, &r))
 				processcontrol(buf, recvfrom(controlfd, buf, sizeof(buf), MSG_WAITALL, (void *) &addr, &alen), &addr);
+
 			if (FD_ISSET(clifd, &r))
 			{
 				struct sockaddr_in addr;
@@ -2445,54 +2462,58 @@ void mainloop(void)
 }
 
 // Init data structures
-void initdata(void)
+void initdata(int optdebug, char *optconfig)
 {
 	int i;
 
-	if ((_statistics = shared_malloc(sizeof(struct Tstats))) == MAP_FAILED)
+	if (!(_statistics = shared_malloc(sizeof(struct Tstats))))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for _statistics: %s\n", strerror(errno));
 		exit(1);
 	}
-	if ((config = shared_malloc(sizeof(struct configt))) == MAP_FAILED)
+	if (!(config = shared_malloc(sizeof(struct configt))))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for configuration: %s\n", strerror(errno));
 		exit(1);
 	}
 	memset(config, 0, sizeof(struct configt));
 	time(&config->start_time);
-	strncpy(config->config_file, CONFIGFILE, sizeof(config->config_file) - 1);
-	if ((tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)) == MAP_FAILED);
+	strncpy(config->config_file, optconfig, strlen(optconfig));
+	config->debug = optdebug;
+	config->num_tbfs = MAXTBFS;
+	config->rl_rate = 28; // 28kbps
+
+	if (!(tunnel = shared_malloc(sizeof(tunnelt) * MAXTUNNEL)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for tunnels: %s\n", strerror(errno));
 		exit(1);
 	}
-	if ((session = shared_malloc(sizeof(sessiont) * MAXSESSION)) == MAP_FAILED)
+	if (!(session = shared_malloc(sizeof(sessiont) * MAXSESSION)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for sessions: %s\n", strerror(errno));
 		exit(1);
 	}
 
-	if ((sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION)) == MAP_FAILED)
+	if (!(sess_count = shared_malloc(sizeof(sessioncountt) * MAXSESSION)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for sessions_count: %s\n", strerror(errno));
 		exit(1);
 	}
 
-	if ((radius = shared_malloc(sizeof(radiust) * MAXRADIUS)) == MAP_FAILED)
+	if (!(radius = shared_malloc(sizeof(radiust) * MAXRADIUS)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for radius: %s\n", strerror(errno));
 		exit(1);
 	}
 
-	if ((ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)) == MAP_FAILED)
+	if (!(ip_address_pool = shared_malloc(sizeof(ippoolt) * MAXIPPOOL)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for ip_address_pool: %s\n", strerror(errno));
 		exit(1);
 	}
 
 #ifdef RINGBUFFER
-	if ((ringbuffer = shared_malloc(sizeof(struct Tringbuffer))) == MAP_FAILED)
+	if (!(ringbuffer = shared_malloc(sizeof(struct Tringbuffer))))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for ringbuffer: %s\n", strerror(errno));
 		exit(1);
@@ -2500,16 +2521,14 @@ void initdata(void)
 	memset(ringbuffer, 0, sizeof(struct Tringbuffer));
 #endif
 
-	if ((cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION))
-			== MAP_FAILED)
+	if (!(cli_session_actions = shared_malloc(sizeof(struct cli_session_actions) * MAXSESSION)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for cli session actions: %s\n", strerror(errno));
 		exit(1);
 	}
 	memset(cli_session_actions, 0, sizeof(struct cli_session_actions) * MAXSESSION);
 
-	if ((cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION))
-			== MAP_FAILED)
+	if (!(cli_tunnel_actions = shared_malloc(sizeof(struct cli_tunnel_actions) * MAXSESSION)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for cli tunnel actions: %s\n", strerror(errno));
 		exit(1);
@@ -2541,10 +2560,11 @@ void initdata(void)
 		gethostname(hostname, sizeof(hostname));
 		if ((p = strchr(hostname, '.'))) *p = 0;
 	}
+
 	_statistics->start_time = _statistics->last_reset = time(NULL);
 
 #ifdef BGP
-	if ((bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)) == MAP_FAILED)
+	if (!(bgp_peers = shared_malloc(sizeof(struct bgp_peer) * BGP_NUM_PEERS)))
 	{
 		log(0, 0, 0, 0, "Error doing malloc for bgp: %s\n", strerror(errno));
 		exit(1);
@@ -2854,7 +2874,7 @@ void dump_acct_info()
 
 	for (i = 0; i < MAXSESSION; i++)
 	{
-		if (!session[i].opened || !session[i].ip || !session[i].cin || !session[i].cout || !*session[i].user || session[i].walled_garden)
+		if (!session[i].opened || !session[i].ip || (!session[i].cin && !session[i].cout) || !*session[i].user || session[i].walled_garden)
 			continue;
 		if (!f)
 		{
@@ -2896,13 +2916,14 @@ int main(int argc, char *argv[])
 {
 	int o;
 	int optdebug = 0;
+	char *optconfig = CONFIGFILE;
 
 	_program_name = strdup(argv[0]);
 
 	time(&basetime);             // start clock
 
 	// scan args
-	while ((o = getopt(argc, argv, "vc:h:a:")) >= 0)
+	while ((o = getopt(argc, argv, "dvc:h:")) >= 0)
 	{
 		switch (o)
 		{
@@ -2914,10 +2935,12 @@ int main(int argc, char *argv[])
 			case 'v':
 				optdebug++;
 				break;
+			case 'c':
+			    	optconfig = optarg;
+				break;
 			case 'h':
 				snprintf(hostname, sizeof(hostname), "%s", optarg);
 				break;
-			case '?':
 			default:
 				printf("Args are:\n"
 				       "\t-d\tDetach from terminal\n"
@@ -2939,13 +2962,11 @@ int main(int argc, char *argv[])
 
 	initiptables();
 	initplugins();
-	initdata();
-
-	config->debug = optdebug;
+	initdata(optdebug, optconfig);
 
-	init_tbf();
 	init_cli(hostname);
 	read_config_file();
+	init_tbf(config->num_tbfs);
 
 	log(0, 0, 0, 0, "L2TPNS version " VERSION "\n");
 	log(0, 0, 0, 0, "Copyright (c) 2003, 2004 Optus Internet Engineering\n");
@@ -3516,7 +3537,6 @@ int sessionsetup(tunnelidt t, sessionidt s)
 
 	CSTAT(call_sessionsetup);
 
-
 	log(3, session[s].ip, s, t, "Doing session setup for session\n");
 
 	if (!session[s].ip || session[s].ip == 0xFFFFFFFE)
@@ -3526,7 +3546,11 @@ int sessionsetup(tunnelidt t, sessionidt s)
 			log(3, 0, s, t, "   No IP allocated. Assigned %s from pool\n",
 					inet_toa(htonl(session[s].ip)));
 		else
+		{
 			log(0, 0, s, t, "   No IP allocated. The IP address pool is FULL!\n");
+			sessionshutdown(s, "No IP addresses available");
+			return 0;
+		}
 	}
 
 
@@ -4013,3 +4037,77 @@ int cmd_show_hist_open(struct cli_def *cli, char *command, char **argv, int argc
 	cli_print(cli, "%d total sessions open.", count);
 	return CLI_OK;
 }
+
+/* Unhide an avp.
+ *
+ * This unencodes the AVP using the L2TP CHAP secret and the
+ * previously stored random vector. It replaces the hidden data with
+ * the cleartext data and returns the length of the cleartext data
+ * (including the AVP "header" of 6 bytes).
+ *
+ * Based on code from rp-l2tpd by Roaring Penguin Software Inc.
+ */
+int unhide_avp(u8 *avp, tunnelidt t, sessionidt s, u16 length)
+{
+	MD5_CTX ctx;
+	u8 *cursor;
+	u8 digest[16];
+	u8 working_vector[16];
+	uint16_t hidden_length;
+	u8 type[2];
+	size_t done, todo;
+	u8 *output;
+
+	// Find the AVP type.
+	type[0] = *(avp + 4);
+	type[1] = *(avp + 5);
+
+	// Line up with the hidden data
+	cursor = output = avp + 6;
+
+	// Compute initial pad
+	MD5Init(&ctx);
+	MD5Update(&ctx, type, 2);
+	MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+	MD5Update(&ctx, session[s].random_vector, session[s].random_vector_length);
+	MD5Final(digest, &ctx);
+
+	// Get hidden length
+	hidden_length = ((uint16_t) (digest[0] ^ cursor[0])) * 256 + (uint16_t) (digest[1] ^ cursor[1]);
+
+	// Keep these for later use
+	working_vector[0] = *cursor;
+	working_vector[1] = *(cursor + 1);
+	cursor += 2;
+
+	if (hidden_length > length - 8)
+	{
+		log(1, 0, s, t, "Hidden length %d too long in AVP of length %d\n", (int) hidden_length, (int) length);
+		return 0;
+	}
+
+	/* Decrypt remainder */
+	done = 2;
+	todo = hidden_length;
+	while (todo)
+	{
+		working_vector[done] = *cursor;
+		*output = digest[done] ^ *cursor;
+		++output;
+		++cursor;
+		--todo;
+		++done;
+		if (done == 16 && todo)
+		{
+			// Compute new digest
+			done = 0;
+			MD5Init(&ctx);
+			MD5Update(&ctx, config->l2tpsecret, strlen(config->l2tpsecret));
+			MD5Update(&ctx, &working_vector, 16);
+			MD5Final(digest, &ctx);
+		}
+	}
+
+	return hidden_length + 6;
+}
+