Idle timeout patch from Farrell Aultman. Needs testing, unsure if server

code works

--HG--
extra : convert_revision : ff66e05ae040561110af70114bf83f11ed528f05

CHANGES

@@ -16,7 +16,7 @@
   to end up at host3 via the other two, using SSH TCP forwarding. It's a bit
   like onion-routing. All connections are established from the local machine.
   The comma-separated syntax can also be used for scp/rsync, eg
-	  scp -S dbclient matt@martello,root@wrt,canyons:/tmp/dump .
+	  rsync -a -e dbclient m@gateway,m2@host,martello:/home/matt/ ~/backup/
   to bounce through a few hosts.
 
 - Allow restrictions on authorized_keys logins such as restricting commands

cli-runopts.c

@@ -75,6 +75,7 @@ static void printhelp() {
 #endif
 					"-W <receive_window_buffer> (default %d, larger may be faster, max 1MB)\n"
 					"-K <keepalive>  (0 is never, default %d)\n"
+					"-I <idle_timeout>  (0 is never, default %d)\n"
 #ifdef ENABLE_CLI_NETCAT
 					"-B <endhost:endport> Netcat-alike forwarding\n"
 #endif				
@@ -85,7 +86,7 @@ static void printhelp() {
 					"-v    verbose (compiled with DEBUG_TRACE)\n"
 #endif
 					,DROPBEAR_VERSION, cli_opts.progname,
-					DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE);
+					DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE, DEFAULT_IDLE_TIMEOUT);
 					
 }
 
@@ -110,6 +111,7 @@ void cli_getopts(int argc, char ** argv) {
 
 	char* recv_window_arg = NULL;
 	char* keepalive_arg = NULL;
+	char* idle_timeout_arg = NULL;
 
 	/* see printhelp() for options */
 	cli_opts.progname = argv[0];
@@ -261,6 +263,9 @@ void cli_getopts(int argc, char ** argv) {
 				case 'K':
 					next = &keepalive_arg;
 					break;
+				case 'I':
+					next = &idle_timeout_arg;
+					break;
 #ifdef DEBUG_TRACE
 				case 'v':
 					debug_trace = 1;
@@ -369,6 +374,12 @@ void cli_getopts(int argc, char ** argv) {
 		}
 	}
 
+	if (idle_timeout_arg) {
+		if (m_str_to_uint(idle_timeout_arg, &opts.idle_timeout_secs) == DROPBEAR_FAILURE) {
+			dropbear_exit("Bad idle_timeout '%s'", idle_timeout_arg);
+		}
+	}
+
 #ifdef ENABLE_CLI_NETCAT
 	if (cli_opts.cmd && cli_opts.netcat_host) {
 		dropbear_log(LOG_INFO, "Ignoring command '%s' in netcat mode", cli_opts.cmd);

common-channel.c

@@ -691,7 +691,7 @@ void common_recv_msg_channel_data(struct Channel *channel, int fd,
 		dropbear_exit("received data after eof");
 	}
 
- 	if (fd < 0) {
+	if (fd < 0) {
 		/* If we have encountered failed write, the far side might still
 		 * be sending data without having yet received our close notification.
 		 * We just drop the data. */

common-session.c

@@ -63,6 +63,7 @@ void common_session_init(int sock_in, int sock_out, char* remotehost) {
 	ses.maxfd = MAX(sock_in, sock_out);
 
 	ses.connect_time = 0;
+	ses.last_trx_packet_time = 0;
 	ses.last_packet_time = 0;
 	
 	if (pipe(ses.signal_pipe) < 0) {
@@ -258,7 +259,7 @@ void session_identification() {
 		ses.remoteclosed();
 	}
 
-    /* If they send more than 50 lines, something is wrong */
+	/* If they send more than 50 lines, something is wrong */
 	for (i = 0; i < 50; i++) {
 		len = ident_readln(ses.sock_in, linebuf, sizeof(linebuf));
 
@@ -283,11 +284,11 @@ void session_identification() {
 		memcpy(ses.remoteident, linebuf, len);
 	}
 
-    /* Shall assume that 2.x will be backwards compatible. */
-    if (strncmp(ses.remoteident, "SSH-2.", 6) != 0
-            && strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) {
-        dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
-    }
+	/* Shall assume that 2.x will be backwards compatible. */
+	if (strncmp(ses.remoteident, "SSH-2.", 6) != 0
+			&& strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) {
+		dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
+	}
 
 	TRACE(("remoteident: %s", ses.remoteident))
 
@@ -399,9 +400,14 @@ static void checktimeouts() {
 	}
 	
 	if (opts.keepalive_secs > 0 
-		&& now - ses.last_packet_time >= opts.keepalive_secs) {
+			&& now - ses.last_trx_packet_time >= opts.keepalive_secs) {
 		send_msg_ignore();
 	}
+
+	if (opts.idle_timeout_secs > 0 && ses.last_packet_time > 0
+			&& now - ses.last_packet_time >= opts.idle_timeout_secs) {
+		dropbear_close("Idle timeout");
+	}
 }
 
 static long select_timeout() {
@@ -414,6 +420,8 @@ static long select_timeout() {
 		ret = MIN(AUTH_TIMEOUT, ret);
 	if (opts.keepalive_secs > 0)
 		ret = MIN(opts.keepalive_secs, ret);
+    if (opts.idle_timeout_secs > 0)
+        ret = MIN(opts.idle_timeout_secs, ret);
 	return ret;
 }
 

options.h

@@ -149,9 +149,9 @@ etc) slower (perhaps by 50%). Recommended for most small systems. */
  * but there's an interface via a PAM module - don't bother using it otherwise.
  * You can't enable both PASSWORD and PAM. */
 
-#define ENABLE_SVR_PASSWORD_AUTH
+/*#define ENABLE_SVR_PASSWORD_AUTH*/
 /* PAM requires ./configure --enable-pam */
-/*#define ENABLE_SVR_PAM_AUTH*/
+#define ENABLE_SVR_PAM_AUTH
 #define ENABLE_SVR_PUBKEY_AUTH
 
 /* Wether to ake public key options in authorized_keys file into account */
@@ -258,6 +258,10 @@ etc) slower (perhaps by 50%). Recommended for most small systems. */
 be overridden at runtime with -K. 0 disables keepalives */
 #define DEFAULT_KEEPALIVE 0
 
+/* Ensure that data is received within IDLE_TIMEOUT seconds. This can
+be overridden at runtime with -I. 0 disables idle timeouts */
+#define DEFAULT_IDLE_TIMEOUT 0
+
 /* The default path. This will often get replaced by the shell */
 #define DEFAULT_PATH "/usr/bin:/bin"
 

packet.c

@@ -72,6 +72,7 @@ void write_packet() {
 		}
 	} 
 	
+	ses.last_trx_packet_time = time(NULL);
 	ses.last_packet_time = time(NULL);
 
 	if (written == 0) {

process-packet.c

@@ -70,6 +70,7 @@ void process_packet() {
 			dropbear_close("Disconnect received");
 	}
 
+    ses.last_packet_time = time(NULL);
 
 	/* This applies for KEX, where the spec says the next packet MUST be
 	 * NEWKEYS */

runopts.h

@@ -38,6 +38,7 @@ typedef struct runopts {
 #endif
 	unsigned int recv_window;
 	unsigned int keepalive_secs;
+	unsigned int idle_timeout_secs;
 
 } runopts;
 

session.h

@@ -148,12 +148,16 @@ struct sshsession {
 
 	unsigned char lastpacket; /* What the last received packet type was */
 	
-    int signal_pipe[2]; /* stores endpoints of a self-pipe used for
+	int signal_pipe[2]; /* stores endpoints of a self-pipe used for
 						   race-free signal handling */
 						
-	time_t last_packet_time; /* time of the last packet transmission, for
+	time_t last_trx_packet_time; /* time of the last packet transmission, for
 							keepalive purposes */
 
+	time_t last_packet_time; /* time of the last packet transmission or receive, for
+								idle timeout purposes */
+
+
 	/* KEX/encryption related */
 	struct KEXState kexstate;
 	struct key_context *keys;

svr-runopts.c

@@ -82,6 +82,7 @@ static void printhelp(const char * progname) {
 #endif
 					"-W <receive_window_buffer> (default %d, larger may be faster, max 1MB)\n"
 					"-K <keepalive>  (0 is never, default %d)\n"
+					"-I <idle_timeout>  (0 is never, default %d)\n"
 #ifdef DEBUG_TRACE
 					"-v		verbose (compiled with DEBUG_TRACE)\n"
 #endif
@@ -93,7 +94,7 @@ static void printhelp(const char * progname) {
 					RSA_PRIV_FILENAME,
 #endif
 					DROPBEAR_MAX_PORTS, DROPBEAR_DEFPORT, DROPBEAR_PIDFILE,
-					DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE);
+					DEFAULT_RECV_WINDOW, DEFAULT_KEEPALIVE, DEFAULT_IDLE_TIMEOUT);
 }
 
 void svr_getopts(int argc, char ** argv) {
@@ -103,6 +104,7 @@ void svr_getopts(int argc, char ** argv) {
 	int nextisport = 0;
 	char* recv_window_arg = NULL;
 	char* keepalive_arg = NULL;
+	char* idle_timeout_arg = NULL;
 
 	/* see printhelp() for options */
 	svr_opts.rsakeyfile = NULL;
@@ -134,7 +136,8 @@ void svr_getopts(int argc, char ** argv) {
 	svr_opts.usingsyslog = 1;
 #endif
 	opts.recv_window = DEFAULT_RECV_WINDOW;
-	opts.keepalive_secs = DEFAULT_KEEPALIVE;	
+	opts.keepalive_secs = DEFAULT_KEEPALIVE;
+	opts.idle_timeout_secs = DEFAULT_IDLE_TIMEOUT;
 	
 #ifdef ENABLE_SVR_REMOTETCPFWD
 	opts.listen_fwd_all = 0;
@@ -218,6 +221,9 @@ void svr_getopts(int argc, char ** argv) {
 				case 'K':
 					next = &keepalive_arg;
 					break;
+				case 'I':
+					next = &idle_timeout_arg;
+					break;
 #if defined(ENABLE_SVR_PASSWORD_AUTH) || defined(ENABLE_SVR_PAM_AUTH)
 				case 's':
 					svr_opts.noauthpass = 1;
@@ -253,7 +259,7 @@ void svr_getopts(int argc, char ** argv) {
 		svr_opts.addresses[0] = m_strdup(DROPBEAR_DEFADDRESS);
 		svr_opts.portcount = 1;
 	}
-        
+
 	if (svr_opts.dsskeyfile == NULL) {
 		svr_opts.dsskeyfile = DSS_PRIV_FILENAME;
 	}
@@ -294,6 +300,12 @@ void svr_getopts(int argc, char ** argv) {
 			dropbear_exit("Bad keepalive '%s'", keepalive_arg);
 		}
 	}
+
+	if (idle_timeout_arg) {
+		if (m_str_to_uint(idle_timeout_arg, &opts.idle_timeout_secs) == DROPBEAR_FAILURE) {
+			dropbear_exit("Bad idle_timeout '%s'", idle_timeout_arg);
+		}
+	}
 }
 
 static void addportandaddress(char* spec) {