+/* $OpenBSD: clientloop.c,v 1.188 2008/02/22 20:44:02 dtucker Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
*/
#include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.112 2003/06/28 16:23:06 deraadt Exp $");
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/param.h>
+#ifdef HAVE_SYS_STAT_H
+# include <sys/stat.h>
+#endif
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h>
+#endif
+#include <sys/socket.h>
+
+#include <ctype.h>
+#include <errno.h>
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <pwd.h>
+#include <unistd.h>
+
+#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "ssh2.h"
-#include "xmalloc.h"
#include "packet.h"
#include "buffer.h"
#include "compat.h"
#include "channels.h"
#include "dispatch.h"
-#include "buffer.h"
-#include "bufaux.h"
#include "key.h"
+#include "cipher.h"
#include "kex.h"
#include "log.h"
#include "readconf.h"
#include "clientloop.h"
+#include "sshconnect.h"
#include "authfd.h"
#include "atomicio.h"
-#include "sshtty.h"
+#include "sshpty.h"
#include "misc.h"
-#include "readpass.h"
+#include "monitor_fdpass.h"
+#include "match.h"
+#include "msg.h"
/* import options */
extern Options options;
/* Flag indicating that stdin should be redirected from /dev/null. */
extern int stdin_null_flag;
+/* Flag indicating that no shell has been requested */
+extern int no_shell_flag;
+
+/* Control socket */
+extern int control_fd;
+
/*
* Name of the host we are connecting to. This is the name given on the
* command line, or the HostName specified for the user-supplied name in a
static volatile sig_atomic_t received_window_change_signal = 0;
static volatile sig_atomic_t received_signal = 0;
-/* Flag indicating whether the user\'s terminal is in non-blocking mode. */
+/* Flag indicating whether the user's terminal is in non-blocking mode. */
static int in_non_blocking_mode = 0;
/* Common data for the client loop code. */
-static int quit_pending; /* Set to non-zero to quit the client loop. */
+static volatile sig_atomic_t quit_pending; /* Set non-zero to quit the loop. */
static int escape_char; /* Escape character. */
static int escape_pending; /* Last character was the escape character */
static int last_was_cr; /* Last character was a newline. */
static void client_init_dispatch(void);
int session_ident = -1;
+struct confirm_ctx {
+ int want_tty;
+ int want_subsys;
+ int want_x_fwd;
+ int want_agent_fwd;
+ Buffer cmd;
+ char *term;
+ struct termios tio;
+ char **env;
+};
+
/*XXX*/
extern Kex *xxx_kex;
+void ssh_process_session2_setup(int, int, int, Buffer *);
+
/* Restores stdin to blocking mode. */
static void
leave_non_blocking(void)
{
if (in_non_blocking_mode) {
- (void) fcntl(fileno(stdin), F_SETFL, 0);
+ unset_nonblock(fileno(stdin));
in_non_blocking_mode = 0;
- fatal_remove_cleanup((void (*) (void *)) leave_non_blocking, NULL);
}
}
enter_non_blocking(void)
{
in_non_blocking_mode = 1;
- (void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK);
- fatal_add_cleanup((void (*) (void *)) leave_non_blocking, NULL);
+ set_nonblock(fileno(stdin));
}
/*
* Signal handler for the window change signal (SIGWINCH). This just sets a
* flag indicating that the window has changed.
*/
-
+/*ARGSUSED */
static void
window_change_handler(int sig)
{
* Signal handler for signals that cause the program to terminate. These
* signals must be trapped to restore terminal modes.
*/
-
+/*ARGSUSED */
static void
signal_handler(int sig)
{
return (double) tv.tv_sec + (double) tv.tv_usec / 1000000.0;
}
+#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
+void
+client_x11_get_proto(const char *display, const char *xauth_path,
+ u_int trusted, char **_proto, char **_data)
+{
+ char cmd[1024];
+ char line[512];
+ char xdisplay[512];
+ static char proto[512], data[512];
+ FILE *f;
+ int got_data = 0, generated = 0, do_unlink = 0, i;
+ char *xauthdir, *xauthfile;
+ struct stat st;
+
+ xauthdir = xauthfile = NULL;
+ *_proto = proto;
+ *_data = data;
+ proto[0] = data[0] = '\0';
+
+ if (xauth_path == NULL ||(stat(xauth_path, &st) == -1)) {
+ debug("No xauth program.");
+ } else {
+ if (display == NULL) {
+ debug("x11_get_proto: DISPLAY not set");
+ return;
+ }
+ /*
+ * Handle FamilyLocal case where $DISPLAY does
+ * not match an authorization entry. For this we
+ * just try "xauth list unix:displaynum.screennum".
+ * XXX: "localhost" match to determine FamilyLocal
+ * is not perfect.
+ */
+ if (strncmp(display, "localhost:", 10) == 0) {
+ snprintf(xdisplay, sizeof(xdisplay), "unix:%s",
+ display + 10);
+ display = xdisplay;
+ }
+ if (trusted == 0) {
+ xauthdir = xmalloc(MAXPATHLEN);
+ xauthfile = xmalloc(MAXPATHLEN);
+ strlcpy(xauthdir, "/tmp/ssh-XXXXXXXXXX", MAXPATHLEN);
+ if (mkdtemp(xauthdir) != NULL) {
+ do_unlink = 1;
+ snprintf(xauthfile, MAXPATHLEN, "%s/xauthfile",
+ xauthdir);
+ snprintf(cmd, sizeof(cmd),
+ "%s -f %s generate %s " SSH_X11_PROTO
+ " untrusted timeout 1200 2>" _PATH_DEVNULL,
+ xauth_path, xauthfile, display);
+ debug2("x11_get_proto: %s", cmd);
+ if (system(cmd) == 0)
+ generated = 1;
+ }
+ }
+
+ /*
+ * When in untrusted mode, we read the cookie only if it was
+ * successfully generated as an untrusted one in the step
+ * above.
+ */
+ if (trusted || generated) {
+ snprintf(cmd, sizeof(cmd),
+ "%s %s%s list %s 2>" _PATH_DEVNULL,
+ xauth_path,
+ generated ? "-f " : "" ,
+ generated ? xauthfile : "",
+ display);
+ debug2("x11_get_proto: %s", cmd);
+ f = popen(cmd, "r");
+ if (f && fgets(line, sizeof(line), f) &&
+ sscanf(line, "%*s %511s %511s", proto, data) == 2)
+ got_data = 1;
+ if (f)
+ pclose(f);
+ } else
+ error("Warning: untrusted X11 forwarding setup failed: "
+ "xauth key data not generated");
+ }
+
+ if (do_unlink) {
+ unlink(xauthfile);
+ rmdir(xauthdir);
+ }
+ if (xauthdir)
+ xfree(xauthdir);
+ if (xauthfile)
+ xfree(xauthfile);
+
+ /*
+ * If we didn't get authentication data, just make up some
+ * data. The forwarding code will check the validity of the
+ * response anyway, and substitute this data. The X11
+ * server, however, will ignore this fake data and use
+ * whatever authentication mechanisms it was using otherwise
+ * for the local connection.
+ */
+ if (!got_data) {
+ u_int32_t rnd = 0;
+
+ logit("Warning: No xauth data; "
+ "using fake authentication data for X11 forwarding.");
+ strlcpy(proto, SSH_X11_PROTO, sizeof proto);
+ for (i = 0; i < 16; i++) {
+ if (i % 4 == 0)
+ rnd = arc4random();
+ snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
+ rnd & 0xff);
+ rnd >>= 8;
+ }
+ }
+}
+
/*
* This is called when the interactive is entered. This checks if there is
* an EOF coming on stdin. We must check this explicitly, as select() does
/** XXX race */
received_window_change_signal = 0;
- if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
- return;
-
debug2("client_check_window_change: changed");
if (compat20) {
- channel_request_start(session_ident, "window-change", 0);
- packet_put_int(ws.ws_col);
- packet_put_int(ws.ws_row);
- packet_put_int(ws.ws_xpixel);
- packet_put_int(ws.ws_ypixel);
- packet_send();
+ channel_send_window_changes();
} else {
+ if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
+ return;
packet_start(SSH_CMSG_WINDOW_SIZE);
- packet_put_int(ws.ws_row);
- packet_put_int(ws.ws_col);
- packet_put_int(ws.ws_xpixel);
- packet_put_int(ws.ws_ypixel);
+ 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);
packet_send();
}
}
+static void
+client_global_request_reply(int type, u_int32_t seq, void *ctxt)
+{
+ keep_alive_timeouts = 0;
+ client_global_request_reply_fwd(type, seq, ctxt);
+}
+
+static void
+server_alive_check(void)
+{
+ if (++keep_alive_timeouts > options.server_alive_count_max) {
+ logit("Timeout, server not responding.");
+ cleanup_exit(255);
+ }
+ packet_start(SSH2_MSG_GLOBAL_REQUEST);
+ packet_put_cstring("keepalive@openssh.com");
+ packet_put_char(1); /* boolean: want reply */
+ packet_send();
+}
+
/*
* Waits until the client can do something (some data becomes available on
* one of the file descriptors).
*/
-
static void
client_wait_until_can_do_something(fd_set **readsetp, fd_set **writesetp,
- int *maxfdp, int *nallocp, int rekeying)
+ int *maxfdp, u_int *nallocp, int rekeying)
{
+ struct timeval tv, *tvp;
+ int ret;
+
/* Add any selections by the channel mechanism. */
channel_prepare_select(readsetp, writesetp, maxfdp, nallocp, rekeying);
if (packet_have_data_to_write())
FD_SET(connection_out, *writesetp);
+ if (control_fd != -1)
+ FD_SET(control_fd, *readsetp);
+
/*
* Wait for something to happen. This will suspend the process until
* some selected descriptor can be read, written, or has some other
- * event pending. Note: if you want to implement SSH_MSG_IGNORE
- * messages to fool traffic analysis, this might be the place to do
- * it: just have a random timeout for the select, and send a random
- * SSH_MSG_IGNORE packet when the timeout expires.
+ * event pending.
*/
- if (select((*maxfdp)+1, *readsetp, *writesetp, NULL, NULL) < 0) {
+ if (options.server_alive_interval == 0 || !compat20)
+ tvp = NULL;
+ else {
+ tv.tv_sec = options.server_alive_interval;
+ tv.tv_usec = 0;
+ tvp = &tv;
+ }
+ ret = select((*maxfdp)+1, *readsetp, *writesetp, NULL, tvp);
+ if (ret < 0) {
char buf[100];
/*
snprintf(buf, sizeof buf, "select: %s\r\n", strerror(errno));
buffer_append(&stderr_buffer, buf, strlen(buf));
quit_pending = 1;
- }
+ } else if (ret == 0)
+ server_alive_check();
}
static void
client_suspend_self(Buffer *bin, Buffer *bout, Buffer *berr)
{
- struct winsize oldws, newws;
-
/* Flush stdout and stderr buffers. */
if (buffer_len(bout) > 0)
atomicio(vwrite, fileno(stdout), buffer_ptr(bout), buffer_len(bout));
buffer_free(bout);
buffer_free(berr);
- /* Save old window size. */
- ioctl(fileno(stdin), TIOCGWINSZ, &oldws);
-
/* Send the suspend signal to the program itself. */
kill(getpid(), SIGTSTP);
- /* Check if the window size has changed. */
- if (ioctl(fileno(stdin), TIOCGWINSZ, &newws) >= 0 &&
- (oldws.ws_row != newws.ws_row ||
- oldws.ws_col != newws.ws_col ||
- oldws.ws_xpixel != newws.ws_xpixel ||
- oldws.ws_ypixel != newws.ws_ypixel))
- received_window_change_signal = 1;
+ /* Reset window sizes in case they have changed */
+ received_window_change_signal = 1;
/* OK, we have been continued by the user. Reinitialize buffers. */
buffer_init(bin);
}
static void
-client_process_net_input(fd_set * readset)
+client_process_net_input(fd_set *readset)
{
int len;
char buf[8192];
}
}
+static void
+client_subsystem_reply(int type, u_int32_t seq, void *ctxt)
+{
+ int id;
+ Channel *c;
+
+ id = packet_get_int();
+ packet_check_eom();
+
+ if ((c = channel_lookup(id)) == NULL) {
+ error("%s: no channel for id %d", __func__, id);
+ return;
+ }
+
+ if (type == SSH2_MSG_CHANNEL_SUCCESS)
+ debug2("Request suceeded on channel %d", id);
+ else if (type == SSH2_MSG_CHANNEL_FAILURE) {
+ error("Request failed on channel %d", id);
+ channel_free(c);
+ }
+}
+
+static void
+client_extra_session2_setup(int id, void *arg)
+{
+ struct confirm_ctx *cctx = arg;
+ const char *display;
+ Channel *c;
+ int i;
+
+ if (cctx == NULL)
+ fatal("%s: cctx == NULL", __func__);
+ if ((c = channel_lookup(id)) == NULL)
+ fatal("%s: no channel for id %d", __func__, id);
+
+ display = getenv("DISPLAY");
+ if (cctx->want_x_fwd && 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, &proto, &data);
+ /* Request forwarding with authentication spoofing. */
+ debug("Requesting X11 forwarding with authentication spoofing.");
+ x11_request_forwarding_with_spoofing(id, display, proto, data);
+ /* XXX wait for reply */
+ }
+
+ if (cctx->want_agent_fwd && options.forward_agent) {
+ debug("Requesting authentication agent forwarding.");
+ channel_request_start(id, "auth-agent-req@openssh.com", 0);
+ packet_send();
+ }
+
+ client_session2_setup(id, cctx->want_tty, cctx->want_subsys,
+ cctx->term, &cctx->tio, c->rfd, &cctx->cmd, cctx->env,
+ client_subsystem_reply);
+
+ c->confirm_ctx = NULL;
+ buffer_free(&cctx->cmd);
+ xfree(cctx->term);
+ if (cctx->env != NULL) {
+ for (i = 0; cctx->env[i] != NULL; i++)
+ xfree(cctx->env[i]);
+ xfree(cctx->env);
+ }
+ xfree(cctx);
+}
+
+static void
+client_process_control(fd_set *readset)
+{
+ Buffer m;
+ Channel *c;
+ int client_fd, new_fd[3], ver, allowed, window, packetmax;
+ socklen_t addrlen;
+ struct sockaddr_storage addr;
+ struct confirm_ctx *cctx;
+ char *cmd;
+ u_int i, j, len, env_len, command, flags;
+ uid_t euid;
+ gid_t egid;
+
+ /*
+ * Accept connection on control socket
+ */
+ if (control_fd == -1 || !FD_ISSET(control_fd, readset))
+ return;
+
+ memset(&addr, 0, sizeof(addr));
+ addrlen = sizeof(addr);
+ if ((client_fd = accept(control_fd,
+ (struct sockaddr*)&addr, &addrlen)) == -1) {
+ error("%s accept: %s", __func__, strerror(errno));
+ return;
+ }
+
+ if (getpeereid(client_fd, &euid, &egid) < 0) {
+ error("%s getpeereid failed: %s", __func__, strerror(errno));
+ close(client_fd);
+ return;
+ }
+ if ((euid != 0) && (getuid() != euid)) {
+ error("control mode uid mismatch: peer euid %u != uid %u",
+ (u_int) euid, (u_int) getuid());
+ close(client_fd);
+ return;
+ }
+
+ unset_nonblock(client_fd);
+
+ /* Read command */
+ buffer_init(&m);
+ if (ssh_msg_recv(client_fd, &m) == -1) {
+ error("%s: client msg_recv failed", __func__);
+ close(client_fd);
+ buffer_free(&m);
+ return;
+ }
+ if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
+ error("%s: wrong client version %d", __func__, ver);
+ buffer_free(&m);
+ close(client_fd);
+ return;
+ }
+
+ allowed = 1;
+ command = buffer_get_int(&m);
+ flags = buffer_get_int(&m);
+
+ buffer_clear(&m);
+
+ switch (command) {
+ case SSHMUX_COMMAND_OPEN:
+ if (options.control_master == SSHCTL_MASTER_ASK ||
+ options.control_master == SSHCTL_MASTER_AUTO_ASK)
+ allowed = ask_permission("Allow shared connection "
+ "to %s? ", host);
+ /* continue below */
+ break;
+ case SSHMUX_COMMAND_TERMINATE:
+ if (options.control_master == SSHCTL_MASTER_ASK ||
+ options.control_master == SSHCTL_MASTER_AUTO_ASK)
+ allowed = ask_permission("Terminate shared connection "
+ "to %s? ", host);
+ if (allowed)
+ quit_pending = 1;
+ /* FALLTHROUGH */
+ case SSHMUX_COMMAND_ALIVE_CHECK:
+ /* Reply for SSHMUX_COMMAND_TERMINATE and ALIVE_CHECK */
+ buffer_clear(&m);
+ buffer_put_int(&m, allowed);
+ buffer_put_int(&m, getpid());
+ if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
+ error("%s: client msg_send failed", __func__);
+ close(client_fd);
+ buffer_free(&m);
+ return;
+ }
+ buffer_free(&m);
+ close(client_fd);
+ return;
+ default:
+ error("Unsupported command %d", command);
+ buffer_free(&m);
+ close(client_fd);
+ return;
+ }
+
+ /* Reply for SSHMUX_COMMAND_OPEN */
+ buffer_clear(&m);
+ buffer_put_int(&m, allowed);
+ buffer_put_int(&m, getpid());
+ if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
+ error("%s: client msg_send failed", __func__);
+ close(client_fd);
+ buffer_free(&m);
+ return;
+ }
+
+ if (!allowed) {
+ error("Refused control connection");
+ close(client_fd);
+ buffer_free(&m);
+ return;
+ }
+
+ buffer_clear(&m);
+ if (ssh_msg_recv(client_fd, &m) == -1) {
+ error("%s: client msg_recv failed", __func__);
+ close(client_fd);
+ buffer_free(&m);
+ return;
+ }
+ if ((ver = buffer_get_char(&m)) != SSHMUX_VER) {
+ error("%s: wrong client version %d", __func__, ver);
+ buffer_free(&m);
+ close(client_fd);
+ return;
+ }
+
+ cctx = xcalloc(1, sizeof(*cctx));
+ cctx->want_tty = (flags & SSHMUX_FLAG_TTY) != 0;
+ cctx->want_subsys = (flags & SSHMUX_FLAG_SUBSYS) != 0;
+ cctx->want_x_fwd = (flags & SSHMUX_FLAG_X11_FWD) != 0;
+ cctx->want_agent_fwd = (flags & SSHMUX_FLAG_AGENT_FWD) != 0;
+ cctx->term = buffer_get_string(&m, &len);
+
+ cmd = buffer_get_string(&m, &len);
+ buffer_init(&cctx->cmd);
+ buffer_append(&cctx->cmd, cmd, strlen(cmd));
+
+ env_len = buffer_get_int(&m);
+ env_len = MIN(env_len, 4096);
+ debug3("%s: receiving %d env vars", __func__, env_len);
+ if (env_len != 0) {
+ cctx->env = xcalloc(env_len + 1, sizeof(*cctx->env));
+ for (i = 0; i < env_len; i++)
+ cctx->env[i] = buffer_get_string(&m, &len);
+ cctx->env[i] = NULL;
+ }
+
+ debug2("%s: accepted tty %d, subsys %d, cmd %s", __func__,
+ cctx->want_tty, cctx->want_subsys, cmd);
+ xfree(cmd);
+
+ /* Gather fds from client */
+ for(i = 0; i < 3; i++) {
+ if ((new_fd[i] = mm_receive_fd(client_fd)) == -1) {
+ error("%s: failed to receive fd %d from slave",
+ __func__, i);
+ for (j = 0; j < i; j++)
+ close(new_fd[j]);
+ for (j = 0; j < env_len; j++)
+ xfree(cctx->env[j]);
+ if (env_len > 0)
+ xfree(cctx->env);
+ xfree(cctx->term);
+ buffer_free(&cctx->cmd);
+ close(client_fd);
+ xfree(cctx);
+ return;
+ }
+ }
+
+ debug2("%s: got fds stdin %d, stdout %d, stderr %d", __func__,
+ new_fd[0], new_fd[1], new_fd[2]);
+
+ /* Try to pick up ttymodes from client before it goes raw */
+ if (cctx->want_tty && tcgetattr(new_fd[0], &cctx->tio) == -1)
+ error("%s: tcgetattr: %s", __func__, strerror(errno));
+
+ /* This roundtrip is just for synchronisation of ttymodes */
+ buffer_clear(&m);
+ if (ssh_msg_send(client_fd, SSHMUX_VER, &m) == -1) {
+ error("%s: client msg_send failed", __func__);
+ close(client_fd);
+ close(new_fd[0]);
+ close(new_fd[1]);
+ close(new_fd[2]);
+ buffer_free(&m);
+ xfree(cctx->term);
+ if (env_len != 0) {
+ for (i = 0; i < env_len; i++)
+ xfree(cctx->env[i]);
+ xfree(cctx->env);
+ }
+ return;
+ }
+ buffer_free(&m);
+
+ /* enable nonblocking unless tty */
+ if (!isatty(new_fd[0]))
+ set_nonblock(new_fd[0]);
+ if (!isatty(new_fd[1]))
+ set_nonblock(new_fd[1]);
+ if (!isatty(new_fd[2]))
+ set_nonblock(new_fd[2]);
+
+ set_nonblock(client_fd);
+
+ window = CHAN_SES_WINDOW_DEFAULT;
+ packetmax = CHAN_SES_PACKET_DEFAULT;
+ if (cctx->want_tty) {
+ window >>= 1;
+ packetmax >>= 1;
+ }
+
+ c = channel_new("session", SSH_CHANNEL_OPENING,
+ new_fd[0], new_fd[1], new_fd[2], window, packetmax,
+ CHAN_EXTENDED_WRITE, "client-session", /*nonblock*/0);
+
+ /* XXX */
+ c->ctl_fd = client_fd;
+
+ debug3("%s: channel_new: %d", __func__, c->self);
+
+ channel_send_open(c->self);
+ channel_register_confirm(c->self, client_extra_session2_setup, cctx);
+}
+
static void
process_cmdline(void)
{
void (*handler)(int);
- char *s, *cmd;
- u_short fwd_port, fwd_host_port;
- char buf[1024], sfwd_port[6], sfwd_host_port[6];
+ char *s, *cmd, *cancel_host;
+ int delete = 0;
int local = 0;
+ u_short cancel_port;
+ Forward fwd;
+
+ bzero(&fwd, sizeof(fwd));
+ fwd.listen_host = fwd.connect_host = NULL;
leave_raw_mode();
handler = signal(SIGINT, SIG_IGN);
cmd = s = read_passphrase("\r\nssh> ", RP_ECHO);
if (s == NULL)
goto out;
- while (*s && isspace(*s))
+ while (isspace(*s))
s++;
- if (*s == 0)
+ if (*s == '-')
+ s++; /* Skip cmdline '-', if any */
+ if (*s == '\0')
goto out;
- if (strlen(s) < 2 || s[0] != '-' || !(s[1] == 'L' || s[1] == 'R')) {
- logit("Invalid command.");
+
+ if (*s == 'h' || *s == 'H' || *s == '?') {
+ logit("Commands:");
+ logit(" -L[bind_address:]port:host:hostport "
+ "Request local forward");
+ logit(" -R[bind_address:]port:host:hostport "
+ "Request remote forward");
+ logit(" -KR[bind_address:]port "
+ "Cancel remote forward");
+ if (!options.permit_local_command)
+ goto out;
+ logit(" !args "
+ "Execute local command");
goto out;
}
- if (s[1] == 'L')
- local = 1;
- if (!local && !compat20) {
- logit("Not supported for SSH protocol version 1.");
+
+ if (*s == '!' && options.permit_local_command) {
+ s++;
+ ssh_local_cmd(s);
goto out;
}
- s += 2;
- while (*s && isspace(*s))
- s++;
- if (sscanf(s, "%5[0-9]:%255[^:]:%5[0-9]",
- sfwd_port, buf, sfwd_host_port) != 3 &&
- sscanf(s, "%5[0-9]/%255[^/]/%5[0-9]",
- sfwd_port, buf, sfwd_host_port) != 3) {
- logit("Bad forwarding specification.");
+ if (*s == 'K') {
+ delete = 1;
+ s++;
+ }
+ if (*s != 'L' && *s != 'R') {
+ logit("Invalid command.");
goto out;
}
- if ((fwd_port = a2port(sfwd_port)) == 0 ||
- (fwd_host_port = a2port(sfwd_host_port)) == 0) {
- logit("Bad forwarding port(s).");
+ if (*s == 'L')
+ local = 1;
+ if (local && delete) {
+ logit("Not supported.");
goto out;
}
- if (local) {
- if (channel_setup_local_fwd_listener(fwd_port, buf,
- fwd_host_port, options.gateway_ports) < 0) {
- logit("Port forwarding failed.");
+ if ((!local || delete) && !compat20) {
+ logit("Not supported for SSH protocol version 1.");
+ goto out;
+ }
+
+ while (isspace(*++s))
+ ;
+
+ if (delete) {
+ cancel_port = 0;
+ cancel_host = hpdelim(&s); /* may be NULL */
+ if (s != NULL) {
+ cancel_port = a2port(s);
+ cancel_host = cleanhostname(cancel_host);
+ } else {
+ cancel_port = a2port(cancel_host);
+ cancel_host = NULL;
+ }
+ if (cancel_port == 0) {
+ logit("Bad forwarding close port");
goto out;
}
- } else
- channel_request_remote_forwarding(fwd_port, buf,
- fwd_host_port);
- logit("Forwarding port.");
+ channel_request_rforward_cancel(cancel_host, cancel_port);
+ } else {
+ if (!parse_forward(&fwd, s)) {
+ logit("Bad forwarding specification.");
+ goto out;
+ }
+ if (local) {
+ if (channel_setup_local_fwd_listener(fwd.listen_host,
+ fwd.listen_port, fwd.connect_host,
+ fwd.connect_port, options.gateway_ports) < 0) {
+ logit("Port forwarding failed.");
+ goto out;
+ }
+ } else {
+ if (channel_request_remote_forwarding(fwd.listen_host,
+ fwd.listen_port, fwd.connect_host,
+ fwd.connect_port) < 0) {
+ logit("Port forwarding failed.");
+ goto out;
+ }
+ }
+
+ logit("Forwarding port.");
+ }
+
out:
signal(SIGINT, handler);
enter_raw_mode();
if (cmd)
xfree(cmd);
+ if (fwd.listen_host != NULL)
+ xfree(fwd.listen_host);
+ if (fwd.connect_host != NULL)
+ xfree(fwd.connect_host);
}
/* process the characters one by one */
u_char ch;
char *s;
- for (i = 0; i < len; i++) {
+ if (len <= 0)
+ return (0);
+
+ for (i = 0; i < (u_int)len; i++) {
/* Get one character at a time. */
ch = buf[i];
}
static void
-client_process_input(fd_set * readset)
+client_process_input(fd_set *readset)
{
int len;
char buf[8192];
}
static void
-client_process_output(fd_set * writeset)
+client_process_output(fd_set *writeset)
{
int len;
char buf[100];
static void
client_channel_closed(int id, void *arg)
{
- if (id != session_ident)
- error("client_channel_closed: id %d != session_ident %d",
- id, session_ident);
channel_cancel_cleanup(id);
session_closed = 1;
- if (in_raw_mode())
- leave_raw_mode();
+ leave_raw_mode();
}
/*
{
fd_set *readset = NULL, *writeset = NULL;
double start_time, total_time;
- int max_fd = 0, max_fd2 = 0, len, rekeying = 0, nalloc = 0;
+ int max_fd = 0, max_fd2 = 0, len, rekeying = 0;
+ u_int nalloc = 0;
char buf[100];
debug("Entering interactive session.");
connection_in = packet_get_connection_in();
connection_out = packet_get_connection_out();
max_fd = MAX(connection_in, connection_out);
+ if (control_fd != -1)
+ max_fd = MAX(max_fd, control_fd);
if (!compat20) {
/* enable nonblocking unless tty */
* Set signal handlers, (e.g. to restore non-blocking mode)
* but don't overwrite SIG_IGN, matches behaviour from rsh(1)
*/
+ if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
+ signal(SIGHUP, signal_handler);
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, signal_handler);
if (signal(SIGQUIT, SIG_IGN) != SIG_IGN)
signal(SIGQUIT, signal_handler);
if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
signal(SIGTERM, signal_handler);
- if (have_pty)
- signal(SIGWINCH, window_change_handler);
+ signal(SIGWINCH, window_change_handler);
if (have_pty)
enter_raw_mode();
session_ident = ssh2_chan_id;
if (escape_char != SSH_ESCAPECHAR_NONE)
channel_register_filter(session_ident,
- simple_escape_filter);
+ simple_escape_filter, NULL);
if (session_ident != -1)
channel_register_cleanup(session_ident,
- client_channel_closed);
+ client_channel_closed, 0);
} else {
/* Check if we should immediately send eof on stdin. */
client_check_initial_eof_on_stdin();
/* Buffer input from the connection. */
client_process_net_input(readset);
+ /* Accept control connections. */
+ client_process_control(readset);
+
if (quit_pending)
break;
/* Terminate the session. */
/* Stop watching for window change. */
- if (have_pty)
- signal(SIGWINCH, SIG_DFL);
+ signal(SIGWINCH, SIG_DFL);
channel_free_all();
if (!isatty(fileno(stderr)))
unset_nonblock(fileno(stderr));
- if (received_signal) {
- if (in_non_blocking_mode) /* XXX */
- leave_non_blocking();
- fatal("Killed by signal %d.", (int) received_signal);
+ /*
+ * If there was no shell or command requested, there will be no remote
+ * exit status to be returned. In that case, clear error code if the
+ * connection was deliberately terminated at this end.
+ */
+ if (no_shell_flag && received_signal == SIGTERM) {
+ received_signal = 0;
+ exit_status = 0;
}
+ if (received_signal)
+ fatal("Killed by signal %d.", (int) received_signal);
+
/*
* In interactive mode (with pseudo tty) display a message indicating
* that the connection has been closed.
/* Flag that we want to exit. */
quit_pending = 1;
}
+static void
+client_input_agent_open(int type, u_int32_t seq, void *ctxt)
+{
+ Channel *c = NULL;
+ int remote_id, sock;
+
+ /* Read the remote channel number from the message. */
+ remote_id = packet_get_int();
+ packet_check_eom();
+
+ /*
+ * Get a connection to the local authentication agent (this may again
+ * get forwarded).
+ */
+ sock = ssh_get_authentication_socket();
+
+ /*
+ * If we could not connect the agent, send an error message back to
+ * the server. This should never happen unless the agent dies,
+ * because authentication forwarding is only enabled if we have an
+ * agent.
+ */
+ if (sock >= 0) {
+ c = channel_new("", SSH_CHANNEL_OPEN, sock, sock,
+ -1, 0, 0, 0, "authentication agent connection", 1);
+ c->remote_id = remote_id;
+ c->force_drain = 1;
+ }
+ if (c == NULL) {
+ packet_start(SSH_MSG_CHANNEL_OPEN_FAILURE);
+ packet_put_int(remote_id);
+ } else {
+ /* Send a confirmation to the remote host. */
+ debug("Forwarding authentication connection.");
+ packet_start(SSH_MSG_CHANNEL_OPEN_CONFIRMATION);
+ packet_put_int(remote_id);
+ packet_put_int(c->self);
+ }
+ packet_send();
+}
static Channel *
client_request_forwarded_tcpip(const char *request_type, int rchan)
}
c = channel_new("forwarded-tcpip",
SSH_CHANNEL_CONNECTING, sock, sock, -1,
- CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
+ CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
originator_address, 1);
xfree(originator_address);
xfree(listen_address);
if (!options.forward_x11) {
error("Warning: ssh server tried X11 forwarding.");
- error("Warning: this is probably a break in attempt by a malicious server.");
+ error("Warning: this is probably a break-in attempt by a malicious server.");
return NULL;
}
originator = packet_get_string(NULL);
if (!options.forward_agent) {
error("Warning: ssh server tried agent forwarding.");
- error("Warning: this is probably a break in attempt by a malicious server.");
+ error("Warning: this is probably a break-in attempt by a malicious server.");
return NULL;
}
- sock = ssh_get_authentication_socket();
+ sock = ssh_get_authentication_socket();
if (sock < 0)
return NULL;
c = channel_new("authentication agent connection",
SSH_CHANNEL_OPEN, sock, sock, -1,
- CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_WINDOW_DEFAULT, 0,
+ CHAN_X11_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0,
"authentication agent connection", 1);
c->force_drain = 1;
return c;
}
+int
+client_request_tun_fwd(int tun_mode, int local_tun, int remote_tun)
+{
+ Channel *c;
+ int fd;
+
+ if (tun_mode == SSH_TUNMODE_NO)
+ return 0;
+
+ if (!compat20) {
+ error("Tunnel forwarding is not support for protocol 1");
+ return -1;
+ }
+
+ debug("Requesting tun unit %d in mode %d", local_tun, tun_mode);
+
+ /* Open local tunnel device */
+ if ((fd = tun_open(local_tun, tun_mode)) == -1) {
+ error("Tunnel device open failed.");
+ return -1;
+ }
+
+ c = channel_new("tun", SSH_CHANNEL_OPENING, fd, fd, -1,
+ CHAN_TCP_WINDOW_DEFAULT, CHAN_TCP_PACKET_DEFAULT, 0, "tun", 1);
+ c->datagram = 1;
+
+#if defined(SSH_TUN_FILTER)
+ if (options.tun_open == SSH_TUNMODE_POINTOPOINT)
+ channel_register_filter(c->self, sys_tun_infilter,
+ sys_tun_outfilter);
+#endif
+
+ packet_start(SSH2_MSG_CHANNEL_OPEN);
+ packet_put_cstring("tun@openssh.com");
+ packet_put_int(c->self);
+ packet_put_int(c->local_window_max);
+ packet_put_int(c->local_maxpacket);
+ packet_put_int(tun_mode);
+ packet_put_int(remote_tun);
+ packet_send();
+
+ return 0;
+}
+
/* XXXX move to generic input handler */
static void
client_input_channel_open(int type, u_int32_t seq, void *ctxt)
client_input_channel_req(int type, u_int32_t seq, void *ctxt)
{
Channel *c = NULL;
- int id, reply, success = 0;
+ int exitval, id, reply, success = 0;
char *rtype;
id = packet_get_int();
debug("client_input_channel_req: channel %d rtype %s reply %d",
id, rtype, reply);
- if (session_ident == -1) {
- error("client_input_channel_req: no channel %d", session_ident);
- } else if (id != session_ident) {
- error("client_input_channel_req: channel %d: wrong channel: %d",
- session_ident, id);
- }
- c = channel_lookup(id);
- if (c == NULL) {
+ if (id == -1) {
+ error("client_input_channel_req: request for channel -1");
+ } else if ((c = channel_lookup(id)) == NULL) {
error("client_input_channel_req: channel %d: unknown channel", id);
} else if (strcmp(rtype, "exit-status") == 0) {
- success = 1;
- exit_status = packet_get_int();
+ exitval = packet_get_int();
+ if (id == session_ident) {
+ success = 1;
+ exit_status = exitval;
+ } else if (c->ctl_fd == -1) {
+ error("client_input_channel_req: unexpected channel %d",
+ session_ident);
+ } else {
+ atomicio(vwrite, c->ctl_fd, &exitval, sizeof(exitval));
+ success = 1;
+ }
packet_check_eom();
}
if (reply) {
packet_start(success ?
SSH2_MSG_CHANNEL_SUCCESS : SSH2_MSG_CHANNEL_FAILURE);
- packet_put_int(c->remote_id);
+ packet_put_int(id);
packet_send();
}
xfree(rtype);
rtype = packet_get_string(NULL);
want_reply = packet_get_char();
- debug("client_input_global_request: rtype %s want_reply %d", rtype, want_reply);
+ debug("client_input_global_request: rtype %s want_reply %d",
+ rtype, want_reply);
if (want_reply) {
packet_start(success ?
SSH2_MSG_REQUEST_SUCCESS : SSH2_MSG_REQUEST_FAILURE);
xfree(rtype);
}
+void
+client_session2_setup(int id, int want_tty, int want_subsystem,
+ const char *term, struct termios *tiop, int in_fd, Buffer *cmd, char **env,
+ dispatch_fn *subsys_repl)
+{
+ int len;
+ Channel *c = NULL;
+
+ debug2("%s: id %d", __func__, id);
+
+ if ((c = channel_lookup(id)) == NULL)
+ fatal("client_session2_setup: channel %d: unknown channel", id);
+
+ if (want_tty) {
+ struct winsize ws;
+ struct termios tio;
+
+ /* Store window size in the packet. */
+ if (ioctl(in_fd, TIOCGWINSZ, &ws) < 0)
+ memset(&ws, 0, sizeof(ws));
+
+ channel_request_start(id, "pty-req", 0);
+ packet_put_cstring(term != NULL ? term : "");
+ packet_put_int((u_int)ws.ws_col);
+ packet_put_int((u_int)ws.ws_row);
+ packet_put_int((u_int)ws.ws_xpixel);
+ packet_put_int((u_int)ws.ws_ypixel);
+ tio = get_saved_tio();
+ tty_make_modes(-1, tiop != NULL ? tiop : &tio);
+ packet_send();
+ /* XXX wait for reply */
+ c->client_tty = 1;
+ }
+
+ /* Transfer any environment variables from client to server */
+ if (options.num_send_env != 0 && env != NULL) {
+ int i, j, matched;
+ char *name, *val;
+
+ debug("Sending environment.");
+ for (i = 0; env[i] != NULL; i++) {
+ /* Split */
+ name = xstrdup(env[i]);
+ if ((val = strchr(name, '=')) == NULL) {
+ xfree(name);
+ continue;
+ }
+ *val++ = '\0';
+
+ matched = 0;
+ for (j = 0; j < options.num_send_env; j++) {
+ if (match_pattern(name, options.send_env[j])) {
+ matched = 1;
+ break;
+ }
+ }
+ if (!matched) {
+ debug3("Ignored env %s", name);
+ xfree(name);
+ continue;
+ }
+
+ debug("Sending env %s = %s", name, val);
+ channel_request_start(id, "env", 0);
+ packet_put_cstring(name);
+ packet_put_cstring(val);
+ packet_send();
+ xfree(name);
+ }
+ }
+
+ len = buffer_len(cmd);
+ if (len > 0) {
+ if (len > 900)
+ len = 900;
+ if (want_subsystem) {
+ debug("Sending subsystem: %.*s", len, (u_char*)buffer_ptr(cmd));
+ channel_request_start(id, "subsystem", subsys_repl != NULL);
+ if (subsys_repl != NULL) {
+ /* register callback for reply */
+ /* XXX we assume that client_loop has already been called */
+ dispatch_set(SSH2_MSG_CHANNEL_FAILURE, subsys_repl);
+ dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, subsys_repl);
+ }
+ } else {
+ debug("Sending command: %.*s", len, (u_char*)buffer_ptr(cmd));
+ channel_request_start(id, "exec", 0);
+ }
+ packet_put_string(buffer_ptr(cmd), buffer_len(cmd));
+ packet_send();
+ } else {
+ channel_request_start(id, "shell", 0);
+ packet_send();
+ }
+}
+
static void
client_init_dispatch_20(void)
{
dispatch_set(SSH_SMSG_STDOUT_DATA, &client_input_stdout_data);
dispatch_set(SSH_SMSG_AGENT_OPEN, options.forward_agent ?
- &auth_input_open_request : &deny_input_open);
+ &client_input_agent_open : &deny_input_open);
dispatch_set(SSH_SMSG_X11_OPEN, options.forward_x11 ?
&x11_input_open : &deny_input_open);
}
else
client_init_dispatch_15();
}
+
+/* client specific fatal cleanup */
+void
+cleanup_exit(int i)
+{
+ leave_raw_mode();
+ leave_non_blocking();
+ if (options.control_path != NULL && control_fd != -1)
+ unlink(options.control_path);
+ _exit(i);
+}
andersk / gssapi-openssh.git / blobdiff