Exemple #1
0
static int
ssh_session2(void)
{
	int id = -1;

	/* XXX should be pre-session */
	ssh_init_forwarding();

	if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
		id = ssh_session2_open();

	/* If we don't expect to open a new session, then disallow it */
	if (options.control_master == SSHCTL_MASTER_NO &&
	    (datafellows & SSH_NEW_OPENSSH)) {
		debug("Requesting [email protected]");
		packet_start(SSH2_MSG_GLOBAL_REQUEST);
		packet_put_cstring("*****@*****.**");
		packet_put_char(0);
		packet_send();
	}

	/* Execute a local command */
	if (options.local_command != NULL &&
	    options.permit_local_command)
		ssh_local_cmd(options.local_command);

	/* Start listening for multiplex clients */
	muxserver_listen();

	if (options.use_roaming)
		request_roaming();

	return client_loop(tty_flag, tty_flag ?
	    options.escape_char : SSH_ESCAPECHAR_NONE, id);
}
Exemple #2
0
static int
ssh_session2(void)
{
	int id = -1;

	/* XXX should be pre-session */
	ssh_init_forwarding();

	if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
		id = ssh_session2_open();

	/* If we don't expect to open a new session, then disallow it */
	if (options.control_master == SSHCTL_MASTER_NO &&
	    (datafellows & SSH_NEW_OPENSSH)) {
		debug("Requesting [email protected]");
		packet_start(SSH2_MSG_GLOBAL_REQUEST);
		packet_put_cstring("*****@*****.**");
		packet_put_char(0);
		packet_send();
	}

	/* Execute a local command */
	if (options.local_command != NULL &&
	    options.permit_local_command)
		ssh_local_cmd(options.local_command);

	/* Start listening for multiplex clients */
	muxserver_listen();

	/* If requested, let ssh continue in the background. */
	if (fork_after_authentication_flag) {
		fork_after_authentication_flag = 0;
		if (daemon(1, 1) < 0)
			fatal("daemon() failed: %.200s", strerror(errno));
	}

	return client_loop(tty_flag, tty_flag ?
	    options.escape_char : SSH_ESCAPECHAR_NONE, id);
}
static int
ssh_session2(void)
{
	int id = -1;

	/* XXX should be pre-session */
	if (!options.control_persist)
		ssh_init_stdio_forwarding();
	ssh_init_forwarding();

	/* Start listening for multiplex clients */
	muxserver_listen();

 	/*
	 * If we are in control persist mode and have a working mux listen
	 * socket, then prepare to background ourselves and have a foreground
	 * client attach as a control slave.
	 * NB. we must save copies of the flags that we override for
	 * the backgrounding, since we defer attachment of the slave until
	 * after the connection is fully established (in particular,
	 * async rfwd replies have been received for ExitOnForwardFailure).
	 */
 	if (options.control_persist && muxserver_sock != -1) {
		ostdin_null_flag = stdin_null_flag;
		ono_shell_flag = no_shell_flag;
		orequest_tty = options.request_tty;
		otty_flag = tty_flag;
 		stdin_null_flag = 1;
 		no_shell_flag = 1;
 		tty_flag = 0;
		if (!fork_after_authentication_flag)
			need_controlpersist_detach = 1;
		fork_after_authentication_flag = 1;
 	}
	/*
	 * ControlPersist mux listen socket setup failed, attempt the
	 * stdio forward setup that we skipped earlier.
	 */
	if (options.control_persist && muxserver_sock == -1)
		ssh_init_stdio_forwarding();

	if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
		id = ssh_session2_open();

	/* If we don't expect to open a new session, then disallow it */
	if (options.control_master == SSHCTL_MASTER_NO &&
	    (datafellows & SSH_NEW_OPENSSH)) {
		debug("Requesting [email protected]");
		packet_start(SSH2_MSG_GLOBAL_REQUEST);
		packet_put_cstring("*****@*****.**");
		packet_put_char(0);
		packet_send();
	}

	/* Execute a local command */
	if (options.local_command != NULL &&
	    options.permit_local_command)
		ssh_local_cmd(options.local_command);

	/*
	 * If requested and we are not interested in replies to remote
	 * forwarding requests, then let ssh continue in the background.
	 */
	if (fork_after_authentication_flag) {
		if (options.exit_on_forward_failure &&
		    options.num_remote_forwards > 0) {
			debug("deferring postauth fork until remote forward "
			    "confirmation received");
		} else
			fork_postauth();
	}

	if (options.use_roaming)
		request_roaming();

	return client_loop(tty_flag, tty_flag ?
	    options.escape_char : SSH_ESCAPECHAR_NONE, id);
}
static int
ssh_session(void)
{
	int type;
	int interactive = 0;
	int have_tty = 0;
	struct winsize ws;
	char *cp;
	const char *display;

	/* Enable compression if requested. */
	if (options.compression) {
		debug("Requesting compression at level %d.",
		    options.compression_level);

		if (options.compression_level < 1 ||
		    options.compression_level > 9)
			fatal("Compression level must be from 1 (fast) to "
			    "9 (slow, best).");

		/* Send the request. */
		packet_start(SSH_CMSG_REQUEST_COMPRESSION);
		packet_put_int(options.compression_level);
		packet_send();
		packet_write_wait();
		type = packet_read();
		if (type == SSH_SMSG_SUCCESS)
			packet_start_compression(options.compression_level);
		else if (type == SSH_SMSG_FAILURE)
			logit("Warning: Remote host refused compression.");
		else
			packet_disconnect("Protocol error waiting for "
			    "compression response.");
	}
	/* Allocate a pseudo tty if appropriate. */
	if (tty_flag) {
		debug("Requesting pty.");

		/* Start the packet. */
		packet_start(SSH_CMSG_REQUEST_PTY);

		/* Store TERM in the packet.  There is no limit on the
		   length of the string. */
		cp = getenv("TERM");
		if (!cp)
			cp = "";
		packet_put_cstring(cp);

		/* Store window size in the packet. */
		if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
			memset(&ws, 0, sizeof(ws));
		packet_put_int((u_int)ws.ws_row);
		packet_put_int((u_int)ws.ws_col);
		packet_put_int((u_int)ws.ws_xpixel);
		packet_put_int((u_int)ws.ws_ypixel);

		/* Store tty modes in the packet. */
		tty_make_modes(fileno(stdin), NULL);

		/* Send the packet, and wait for it to leave. */
		packet_send();
		packet_write_wait();

		/* Read response from the server. */
		type = packet_read();
		if (type == SSH_SMSG_SUCCESS) {
			interactive = 1;
			have_tty = 1;
		} else if (type == SSH_SMSG_FAILURE)
			logit("Warning: Remote host failed or refused to "
			    "allocate a pseudo tty.");
		else
			packet_disconnect("Protocol error waiting for pty "
			    "request response.");
	}
	/* Request X11 forwarding if enabled and DISPLAY is set. */
	display = getenv("DISPLAY");
	if (options.forward_x11 && display != NULL) {
		char *proto, *data;
		/* Get reasonable local authentication information. */
		client_x11_get_proto(display, options.xauth_location,
		    options.forward_x11_trusted, 
		    options.forward_x11_timeout,
		    &proto, &data);
		/* Request forwarding with authentication spoofing. */
		debug("Requesting X11 forwarding with authentication "
		    "spoofing.");
		x11_request_forwarding_with_spoofing(0, display, proto,
		    data, 0);
		/* Read response from the server. */
		type = packet_read();
		if (type == SSH_SMSG_SUCCESS) {
			interactive = 1;
		} else if (type == SSH_SMSG_FAILURE) {
			logit("Warning: Remote host denied X11 forwarding.");
		} else {
			packet_disconnect("Protocol error waiting for X11 "
			    "forwarding");
		}
	}
	/* Tell the packet module whether this is an interactive session. */
	packet_set_interactive(interactive,
	    options.ip_qos_interactive, options.ip_qos_bulk);

	/* Request authentication agent forwarding if appropriate. */
	check_agent_present();

	if (options.forward_agent) {
		debug("Requesting authentication agent forwarding.");
		auth_request_forwarding();

		/* Read response from the server. */
		type = packet_read();
		packet_check_eom();
		if (type != SSH_SMSG_SUCCESS)
			logit("Warning: Remote host denied authentication agent forwarding.");
	}

	/* Initiate port forwardings. */
	ssh_init_stdio_forwarding();
	ssh_init_forwarding();

	/* Execute a local command */
	if (options.local_command != NULL &&
	    options.permit_local_command)
		ssh_local_cmd(options.local_command);

	/*
	 * If requested and we are not interested in replies to remote
	 * forwarding requests, then let ssh continue in the background.
	 */
	if (fork_after_authentication_flag) {
		if (options.exit_on_forward_failure &&
		    options.num_remote_forwards > 0) {
			debug("deferring postauth fork until remote forward "
			    "confirmation received");
		} else
			fork_postauth();
	}

	/*
	 * If a command was specified on the command line, execute the
	 * command now. Otherwise request the server to start a shell.
	 */
	if (buffer_len(&command) > 0) {
		int len = buffer_len(&command);
		if (len > 900)
			len = 900;
		debug("Sending command: %.*s", len,
		    (u_char *)buffer_ptr(&command));
		packet_start(SSH_CMSG_EXEC_CMD);
		packet_put_string(buffer_ptr(&command), buffer_len(&command));
		packet_send();
		packet_write_wait();
	} else {
		debug("Requesting shell.");
		packet_start(SSH_CMSG_EXEC_SHELL);
		packet_send();
		packet_write_wait();
	}

	/* Enter the interactive session. */
	return client_loop(have_tty, tty_flag ?
	    options.escape_char : SSH_ESCAPECHAR_NONE, 0);
}