version 1.311, 2008/05/08 13:06:11 |
version 1.312, 2008/05/09 14:18:44 |
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*/ |
*/ |
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#include <sys/types.h> |
#include <sys/types.h> |
#include <sys/time.h> |
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#include <sys/resource.h> |
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#include <sys/ioctl.h> |
#include <sys/ioctl.h> |
#include <sys/types.h> |
#include <sys/queue.h> |
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#include <sys/resource.h> |
#include <sys/socket.h> |
#include <sys/socket.h> |
#include <sys/un.h> |
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#include <sys/stat.h> |
#include <sys/stat.h> |
#include <sys/queue.h> |
#include <sys/types.h> |
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#include <sys/time.h> |
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#include <ctype.h> |
#include <ctype.h> |
#include <errno.h> |
#include <errno.h> |
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#include "sshpty.h" |
#include "sshpty.h" |
#include "match.h" |
#include "match.h" |
#include "msg.h" |
#include "msg.h" |
#include "monitor_fdpass.h" |
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#include "uidswap.h" |
#include "uidswap.h" |
#include "version.h" |
#include "version.h" |
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/* pid of proxycommand child process */ |
/* pid of proxycommand child process */ |
pid_t proxy_command_pid = 0; |
pid_t proxy_command_pid = 0; |
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/* fd to control socket */ |
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int control_fd = -1; |
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/* Multiplexing control command */ |
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static u_int mux_command = 0; |
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/* Only used in control client mode */ |
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volatile sig_atomic_t control_client_terminate = 0; |
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u_int control_server_pid = 0; |
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/* Prints a help message to the user. This function never returns. */ |
/* Prints a help message to the user. This function never returns. */ |
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static void |
static void |
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static int ssh_session(void); |
static int ssh_session(void); |
static int ssh_session2(void); |
static int ssh_session2(void); |
static void load_public_identity_files(void); |
static void load_public_identity_files(void); |
static void control_client(const char *path); |
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/* from muxclient.c */ |
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void muxclient(const char *); |
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void muxserver_listen(void); |
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/* |
/* |
* Main program for the ssh client. |
* Main program for the ssh client. |
*/ |
*/ |
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break; |
break; |
case 'O': |
case 'O': |
if (strcmp(optarg, "check") == 0) |
if (strcmp(optarg, "check") == 0) |
mux_command = SSHMUX_COMMAND_ALIVE_CHECK; |
muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK; |
else if (strcmp(optarg, "exit") == 0) |
else if (strcmp(optarg, "exit") == 0) |
mux_command = SSHMUX_COMMAND_TERMINATE; |
muxclient_command = SSHMUX_COMMAND_TERMINATE; |
else |
else |
fatal("Invalid multiplex command."); |
fatal("Invalid multiplex command."); |
break; |
break; |
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"r", options.user, "l", thishost, (char *)NULL); |
"r", options.user, "l", thishost, (char *)NULL); |
xfree(cp); |
xfree(cp); |
} |
} |
if (mux_command != 0 && options.control_path == NULL) |
if (muxclient_command != 0 && options.control_path == NULL) |
fatal("No ControlPath specified for \"-O\" command"); |
fatal("No ControlPath specified for \"-O\" command"); |
if (options.control_path != NULL) |
if (options.control_path != NULL) |
control_client(options.control_path); |
muxclient(options.control_path); |
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timeout_ms = options.connection_timeout * 1000; |
timeout_ms = options.connection_timeout * 1000; |
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exit_status = compat20 ? ssh_session2() : ssh_session(); |
exit_status = compat20 ? ssh_session2() : ssh_session(); |
packet_close(); |
packet_close(); |
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if (options.control_path != NULL && control_fd != -1) |
if (options.control_path != NULL && muxserver_sock != -1) |
unlink(options.control_path); |
unlink(options.control_path); |
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/* |
/* |
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} |
} |
} |
} |
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static void |
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ssh_control_listener(void) |
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{ |
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struct sockaddr_un addr; |
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mode_t old_umask; |
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if (options.control_path == NULL || |
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options.control_master == SSHCTL_MASTER_NO) |
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return; |
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debug("setting up multiplex master socket"); |
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memset(&addr, '\0', sizeof(addr)); |
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addr.sun_family = AF_UNIX; |
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addr.sun_len = offsetof(struct sockaddr_un, sun_path) + |
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strlen(options.control_path) + 1; |
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if (strlcpy(addr.sun_path, options.control_path, |
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sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
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fatal("ControlPath too long"); |
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if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
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fatal("%s socket(): %s", __func__, strerror(errno)); |
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old_umask = umask(0177); |
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if (bind(control_fd, (struct sockaddr *)&addr, addr.sun_len) == -1) { |
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control_fd = -1; |
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if (errno == EINVAL || errno == EADDRINUSE) |
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fatal("ControlSocket %s already exists", |
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options.control_path); |
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else |
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fatal("%s bind(): %s", __func__, strerror(errno)); |
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} |
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umask(old_umask); |
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if (listen(control_fd, 64) == -1) |
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fatal("%s listen(): %s", __func__, strerror(errno)); |
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set_nonblock(control_fd); |
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} |
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/* request pty/x11/agent/tcpfwd/shell for channel */ |
/* request pty/x11/agent/tcpfwd/shell for channel */ |
static void |
static void |
ssh_session2_setup(int id, void *arg) |
ssh_session2_setup(int id, void *arg) |
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ssh_local_cmd(options.local_command); |
ssh_local_cmd(options.local_command); |
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/* Start listening for multiplex clients */ |
/* Start listening for multiplex clients */ |
ssh_control_listener(); |
muxserver_listen(); |
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/* If requested, let ssh continue in the background. */ |
/* If requested, let ssh continue in the background. */ |
if (fork_after_authentication_flag) |
if (fork_after_authentication_flag) |
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xfree(pwdir); |
xfree(pwdir); |
} |
} |
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static void |
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control_client_sighandler(int signo) |
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{ |
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control_client_terminate = signo; |
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} |
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static void |
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control_client_sigrelay(int signo) |
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{ |
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int save_errno = errno; |
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if (control_server_pid > 1) |
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kill(control_server_pid, signo); |
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errno = save_errno; |
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} |
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static int |
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env_permitted(char *env) |
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{ |
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int i, ret; |
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char name[1024], *cp; |
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if ((cp = strchr(env, '=')) == NULL || cp == env) |
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return (0); |
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ret = snprintf(name, sizeof(name), "%.*s", (int)(cp - env), env); |
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if (ret <= 0 || (size_t)ret >= sizeof(name)) |
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fatal("env_permitted: name '%.100s...' too long", env); |
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for (i = 0; i < options.num_send_env; i++) |
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if (match_pattern(name, options.send_env[i])) |
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return (1); |
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return (0); |
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} |
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static void |
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control_client(const char *path) |
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{ |
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struct sockaddr_un addr; |
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int i, r, fd, sock, exitval[2], num_env; |
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Buffer m; |
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char *term; |
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extern char **environ; |
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u_int flags; |
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if (mux_command == 0) |
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mux_command = SSHMUX_COMMAND_OPEN; |
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switch (options.control_master) { |
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case SSHCTL_MASTER_AUTO: |
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case SSHCTL_MASTER_AUTO_ASK: |
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debug("auto-mux: Trying existing master"); |
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/* FALLTHROUGH */ |
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case SSHCTL_MASTER_NO: |
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break; |
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default: |
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return; |
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} |
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memset(&addr, '\0', sizeof(addr)); |
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addr.sun_family = AF_UNIX; |
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addr.sun_len = offsetof(struct sockaddr_un, sun_path) + |
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strlen(path) + 1; |
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if (strlcpy(addr.sun_path, path, |
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sizeof(addr.sun_path)) >= sizeof(addr.sun_path)) |
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fatal("ControlPath too long"); |
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if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
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fatal("%s socket(): %s", __func__, strerror(errno)); |
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if (connect(sock, (struct sockaddr *)&addr, addr.sun_len) == -1) { |
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if (mux_command != SSHMUX_COMMAND_OPEN) { |
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fatal("Control socket connect(%.100s): %s", path, |
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strerror(errno)); |
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} |
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if (errno == ENOENT) |
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debug("Control socket \"%.100s\" does not exist", path); |
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else { |
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error("Control socket connect(%.100s): %s", path, |
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strerror(errno)); |
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} |
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close(sock); |
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return; |
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} |
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if (stdin_null_flag) { |
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if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1) |
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fatal("open(/dev/null): %s", strerror(errno)); |
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if (dup2(fd, STDIN_FILENO) == -1) |
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fatal("dup2: %s", strerror(errno)); |
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if (fd > STDERR_FILENO) |
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close(fd); |
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} |
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term = getenv("TERM"); |
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flags = 0; |
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if (tty_flag) |
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flags |= SSHMUX_FLAG_TTY; |
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if (subsystem_flag) |
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flags |= SSHMUX_FLAG_SUBSYS; |
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if (options.forward_x11) |
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flags |= SSHMUX_FLAG_X11_FWD; |
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if (options.forward_agent) |
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flags |= SSHMUX_FLAG_AGENT_FWD; |
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signal(SIGPIPE, SIG_IGN); |
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buffer_init(&m); |
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/* Send our command to server */ |
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buffer_put_int(&m, mux_command); |
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buffer_put_int(&m, flags); |
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if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
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fatal("%s: msg_send", __func__); |
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buffer_clear(&m); |
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/* Get authorisation status and PID of controlee */ |
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if (ssh_msg_recv(sock, &m) == -1) |
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fatal("%s: msg_recv", __func__); |
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if (buffer_get_char(&m) != SSHMUX_VER) |
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fatal("%s: wrong version", __func__); |
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if (buffer_get_int(&m) != 1) |
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fatal("Connection to master denied"); |
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control_server_pid = buffer_get_int(&m); |
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buffer_clear(&m); |
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switch (mux_command) { |
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case SSHMUX_COMMAND_ALIVE_CHECK: |
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fprintf(stderr, "Master running (pid=%d)\r\n", |
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control_server_pid); |
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exit(0); |
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case SSHMUX_COMMAND_TERMINATE: |
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fprintf(stderr, "Exit request sent.\r\n"); |
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exit(0); |
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case SSHMUX_COMMAND_OPEN: |
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/* continue below */ |
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break; |
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default: |
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fatal("silly mux_command %d", mux_command); |
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} |
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/* SSHMUX_COMMAND_OPEN */ |
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buffer_put_cstring(&m, term ? term : ""); |
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buffer_append(&command, "\0", 1); |
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buffer_put_cstring(&m, buffer_ptr(&command)); |
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if (options.num_send_env == 0 || environ == NULL) { |
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buffer_put_int(&m, 0); |
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} else { |
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/* Pass environment */ |
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num_env = 0; |
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for (i = 0; environ[i] != NULL; i++) |
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if (env_permitted(environ[i])) |
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num_env++; /* Count */ |
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buffer_put_int(&m, num_env); |
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for (i = 0; environ[i] != NULL && num_env >= 0; i++) |
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if (env_permitted(environ[i])) { |
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num_env--; |
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buffer_put_cstring(&m, environ[i]); |
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} |
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} |
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if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1) |
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fatal("%s: msg_send", __func__); |
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if (mm_send_fd(sock, STDIN_FILENO) == -1 || |
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mm_send_fd(sock, STDOUT_FILENO) == -1 || |
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mm_send_fd(sock, STDERR_FILENO) == -1) |
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fatal("%s: send fds failed", __func__); |
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/* Wait for reply, so master has a chance to gather ttymodes */ |
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buffer_clear(&m); |
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if (ssh_msg_recv(sock, &m) == -1) |
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fatal("%s: msg_recv", __func__); |
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if (buffer_get_char(&m) != SSHMUX_VER) |
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fatal("%s: wrong version", __func__); |
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buffer_free(&m); |
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signal(SIGHUP, control_client_sighandler); |
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signal(SIGINT, control_client_sighandler); |
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signal(SIGTERM, control_client_sighandler); |
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signal(SIGWINCH, control_client_sigrelay); |
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if (tty_flag) |
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enter_raw_mode(); |
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/* |
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* Stick around until the controlee closes the client_fd. |
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* Before it does, it is expected to write this process' exit |
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* value (one int). This process must read the value and wait for |
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* the closure of the client_fd; if this one closes early, the |
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* multiplex master will terminate early too (possibly losing data). |
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*/ |
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exitval[0] = 0; |
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for (i = 0; !control_client_terminate && i < (int)sizeof(exitval);) { |
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r = read(sock, (char *)exitval + i, sizeof(exitval) - i); |
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if (r == 0) { |
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debug2("Received EOF from master"); |
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break; |
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} |
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if (r == -1) { |
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if (errno == EINTR) |
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continue; |
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fatal("%s: read %s", __func__, strerror(errno)); |
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} |
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i += r; |
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} |
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close(sock); |
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leave_raw_mode(); |
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if (i > (int)sizeof(int)) |
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fatal("%s: master returned too much data (%d > %lu)", |
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__func__, i, sizeof(int)); |
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if (control_client_terminate) { |
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debug2("Exiting on signal %d", control_client_terminate); |
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exitval[0] = 255; |
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} else if (i < (int)sizeof(int)) { |
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debug2("Control master terminated unexpectedly"); |
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exitval[0] = 255; |
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} else |
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debug2("Received exit status from master %d", exitval[0]); |
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if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET) |
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fprintf(stderr, "Shared connection to %s closed.\r\n", host); |
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exit(exitval[0]); |
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} |
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