-/* $OpenBSD: ssh.c,v 1.276 2006/04/25 08:02:27 dtucker Exp $ */
+/* $OpenBSD: ssh.c,v 1.314 2008/06/10 22:15:23 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
#endif
#include <sys/resource.h>
#include <sys/ioctl.h>
-#include <sys/un.h>
+#include <sys/socket.h>
#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
+#include <pwd.h>
#include <signal.h>
+#include <stdarg.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <netinet/in.h>
+#include <arpa/inet.h>
#include <openssl/evp.h>
#include <openssl/err.h>
+#include "openbsd-compat/openssl-compat.h"
+#include "openbsd-compat/sys-queue.h"
+#include "xmalloc.h"
#include "ssh.h"
#include "ssh1.h"
#include "ssh2.h"
#include "compat.h"
#include "cipher.h"
-#include "xmalloc.h"
#include "packet.h"
#include "buffer.h"
-#include "bufaux.h"
#include "channels.h"
#include "key.h"
#include "authfd.h"
#include "sshpty.h"
#include "match.h"
#include "msg.h"
-#include "monitor_fdpass.h"
#include "uidswap.h"
+#include "version.h"
#ifdef SMARTCARD
#include "scard.h"
/* pid of proxycommand child process */
pid_t proxy_command_pid = 0;
-/* fd to control socket */
-int control_fd = -1;
-
-/* Multiplexing control command */
-static u_int mux_command = 0;
-
-/* Only used in control client mode */
-volatile sig_atomic_t control_client_terminate = 0;
-u_int control_server_pid = 0;
+/* mux.c */
+extern int muxserver_sock;
+extern u_int muxclient_command;
/* Prints a help message to the user. This function never returns. */
usage(void)
{
fprintf(stderr,
-"usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
+"usage: ssh [-1246AaCfgKkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
" [-D [bind_address:]port] [-e escape_char] [-F configfile]\n"
" [-i identity_file] [-L [bind_address:]port:host:hostport]\n"
" [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]\n"
" [-R [bind_address:]port:host:hostport] [-S ctl_path]\n"
-" [-w tunnel:tunnel] [user@]hostname [command]\n"
+" [-w local_tun[:remote_tun]] [user@]hostname [command]\n"
);
exit(255);
}
static int ssh_session(void);
static int ssh_session2(void);
static void load_public_identity_files(void);
-static void control_client(const char *path);
+
+/* from muxclient.c */
+void muxclient(const char *);
+void muxserver_listen(void);
/*
* Main program for the ssh client.
char *p, *cp, *line, buf[256];
struct stat st;
struct passwd *pw;
- int dummy;
+ int dummy, timeout_ms;
extern int optind, optreset;
extern char *optarg;
struct servent *sp;
again:
while ((opt = getopt(ac, av,
- "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVw:XY")) != -1) {
+ "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:KL:MNO:PR:S:TVw:XY")) != -1) {
switch (opt) {
case '1':
options.protocol = SSH_PROTO_1;
break;
case 'O':
if (strcmp(optarg, "check") == 0)
- mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
+ muxclient_command = SSHMUX_COMMAND_ALIVE_CHECK;
else if (strcmp(optarg, "exit") == 0)
- mux_command = SSHMUX_COMMAND_TERMINATE;
+ muxclient_command = SSHMUX_COMMAND_TERMINATE;
else
fatal("Invalid multiplex command.");
break;
case 'k':
options.gss_deleg_creds = 0;
break;
+ case 'K':
+ options.gss_authentication = 1;
+ options.gss_deleg_creds = 1;
+ break;
case 'i':
if (stat(optarg, &st) < 0) {
fprintf(stderr, "Warning: Identity file %s "
if (!read_config_file(config, host, &options, 0))
fatal("Can't open user config file %.100s: "
"%.100s", config, strerror(errno));
- } else {
+ } else {
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
_PATH_SSH_USER_CONFFILE);
(void)read_config_file(buf, host, &options, 1);
}
if (options.proxy_command != NULL &&
- strcmp(options.proxy_command, "none") == 0)
+ strcmp(options.proxy_command, "none") == 0) {
+ xfree(options.proxy_command);
options.proxy_command = NULL;
+ }
if (options.control_path != NULL &&
- strcmp(options.control_path, "none") == 0)
+ strcmp(options.control_path, "none") == 0) {
+ xfree(options.control_path);
options.control_path = NULL;
+ }
if (options.control_path != NULL) {
char thishost[NI_MAXHOST];
snprintf(buf, sizeof(buf), "%d", options.port);
cp = tilde_expand_filename(options.control_path,
original_real_uid);
+ xfree(options.control_path);
options.control_path = percent_expand(cp, "p", buf, "h", host,
"r", options.user, "l", thishost, (char *)NULL);
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");
if (options.control_path != NULL)
- control_client(options.control_path);
+ muxclient(options.control_path);
+
+ timeout_ms = options.connection_timeout * 1000;
/* Open a connection to the remote host. */
if (ssh_connect(host, &hostaddr, options.port,
- options.address_family, options.connection_attempts,
+ options.address_family, options.connection_attempts, &timeout_ms,
+ options.tcp_keep_alive,
#ifdef HAVE_CYGWIN
options.use_privileged_port,
#else
options.proxy_command) != 0)
exit(255);
+ if (timeout_ms > 0)
+ debug3("timeout: %d ms remain after connect", timeout_ms);
+
/*
* If we successfully made the connection, load the host private key
* in case we will need it later for combined rsa-rhosts
signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
/* Log into the remote system. This never returns if the login fails. */
- ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
+ ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr,
+ pw, timeout_ms);
/* We no longer need the private host keys. Clear them now. */
if (sensitive_data.nkeys != 0) {
exit_status = compat20 ? ssh_session2() : ssh_session();
packet_close();
- if (options.control_path != NULL && control_fd != -1)
+ if (options.control_path != NULL && muxserver_sock != -1)
unlink(options.control_path);
/*
options.local_forwards[i].connect_port,
options.gateway_ports);
}
+ if (i > 0 && success != i && options.exit_on_forward_failure)
+ fatal("Could not request local forwarding.");
if (i > 0 && success == 0)
error("Could not request local forwarding.");
options.remote_forwards[i].listen_port,
options.remote_forwards[i].connect_host,
options.remote_forwards[i].connect_port);
- channel_request_remote_forwarding(
+ if (channel_request_remote_forwarding(
options.remote_forwards[i].listen_host,
options.remote_forwards[i].listen_port,
options.remote_forwards[i].connect_host,
- options.remote_forwards[i].connect_port);
+ options.remote_forwards[i].connect_port) < 0) {
+ if (options.exit_on_forward_failure)
+ fatal("Could not request remote forwarding.");
+ else
+ logit("Warning: Could not request remote "
+ "forwarding.");
+ }
}
+
+ /* Initiate tunnel forwarding. */
+ if (options.tun_open != SSH_TUNMODE_NO) {
+ if (client_request_tun_fwd(options.tun_open,
+ options.tun_local, options.tun_remote) == -1) {
+ if (options.exit_on_forward_failure)
+ fatal("Could not request tunnel forwarding.");
+ else
+ error("Could not request tunnel forwarding.");
+ }
+ }
}
static void
/* Initiate port forwardings. */
ssh_init_forwarding();
+ /* Execute a local command */
+ if (options.local_command != NULL &&
+ options.permit_local_command)
+ ssh_local_cmd(options.local_command);
+
/* If requested, let ssh continue in the background. */
if (fork_after_authentication_flag)
if (daemon(1, 1) < 0)
options.escape_char : SSH_ESCAPECHAR_NONE, 0);
}
-static void
-ssh_subsystem_reply(int type, u_int32_t seq, void *ctxt)
-{
- int id, len;
-
- id = packet_get_int();
- len = buffer_len(&command);
- if (len > 900)
- len = 900;
- packet_check_eom();
- if (type == SSH2_MSG_CHANNEL_FAILURE)
- fatal("Request for subsystem '%.*s' failed on channel %d",
- len, (u_char *)buffer_ptr(&command), id);
-}
-
void
client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
{
options.remote_forwards[i].listen_port,
options.remote_forwards[i].connect_host,
options.remote_forwards[i].connect_port);
- if (type == SSH2_MSG_REQUEST_FAILURE)
- logit("Warning: remote port forwarding failed for listen "
- "port %d", options.remote_forwards[i].listen_port);
-}
-
-static void
-ssh_control_listener(void)
-{
- struct sockaddr_un addr;
- mode_t old_umask;
- int addr_len;
-
- if (options.control_path == NULL ||
- options.control_master == SSHCTL_MASTER_NO)
- return;
-
- debug("setting up multiplex master socket");
-
- memset(&addr, '\0', sizeof(addr));
- addr.sun_family = AF_UNIX;
- addr_len = offsetof(struct sockaddr_un, sun_path) +
- strlen(options.control_path) + 1;
-
- if (strlcpy(addr.sun_path, options.control_path,
- sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
- fatal("ControlPath too long");
-
- if ((control_fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
- fatal("%s socket(): %s", __func__, strerror(errno));
-
- old_umask = umask(0177);
- if (bind(control_fd, (struct sockaddr *)&addr, addr_len) == -1) {
- control_fd = -1;
- if (errno == EINVAL || errno == EADDRINUSE)
- fatal("ControlSocket %s already exists",
- options.control_path);
+ if (type == SSH2_MSG_REQUEST_FAILURE) {
+ if (options.exit_on_forward_failure)
+ fatal("Error: remote port forwarding failed for "
+ "listen port %d",
+ options.remote_forwards[i].listen_port);
else
- fatal("%s bind(): %s", __func__, strerror(errno));
+ logit("Warning: remote port forwarding failed for "
+ "listen port %d",
+ options.remote_forwards[i].listen_port);
}
- umask(old_umask);
-
- if (listen(control_fd, 64) == -1)
- fatal("%s listen(): %s", __func__, strerror(errno));
-
- set_nonblock(control_fd);
}
/* request pty/x11/agent/tcpfwd/shell for channel */
packet_send();
}
- if (options.tun_open != SSH_TUNMODE_NO) {
- Channel *c;
- int fd;
-
- debug("Requesting tun.");
- if ((fd = tun_open(options.tun_local,
- options.tun_open)) >= 0) {
- 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(options.tun_open);
- packet_put_int(options.tun_remote);
- packet_send();
- }
- }
-
client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
- NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
+ NULL, fileno(stdin), &command, environ);
packet_set_interactive(interactive);
}
channel_send_open(c->self);
if (!no_shell_flag)
- channel_register_confirm(c->self, ssh_session2_setup, NULL);
+ channel_register_open_confirm(c->self,
+ ssh_session2_setup, NULL);
return c->self;
}
/* XXX should be pre-session */
ssh_init_forwarding();
- ssh_control_listener();
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) {
+ debug("Requesting no-more-sessions@openssh.com");
+ packet_start(SSH2_MSG_GLOBAL_REQUEST);
+ packet_put_cstring("no-more-sessions@openssh.com");
+ 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)
if (daemon(1, 1) < 0)
load_public_identity_files(void)
{
char *filename, *cp, thishost[NI_MAXHOST];
+ char *pwdir = NULL, *pwname = NULL;
int i = 0;
Key *public;
struct passwd *pw;
if (options.smartcard_device != NULL &&
options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
- (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
+ (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL) {
int count = 0;
for (i = 0; keys[i] != NULL; i++) {
count++;
#endif /* SMARTCARD */
if ((pw = getpwuid(original_real_uid)) == NULL)
fatal("load_public_identity_files: getpwuid failed");
+ pwname = xstrdup(pw->pw_name);
+ pwdir = xstrdup(pw->pw_dir);
if (gethostname(thishost, sizeof(thishost)) == -1)
fatal("load_public_identity_files: gethostname: %s",
strerror(errno));
for (; i < options.num_identity_files; i++) {
cp = tilde_expand_filename(options.identity_files[i],
original_real_uid);
- filename = percent_expand(cp, "d", pw->pw_dir,
- "u", pw->pw_name, "l", thishost, "h", host,
+ filename = percent_expand(cp, "d", pwdir,
+ "u", pwname, "l", thishost, "h", host,
"r", options.user, (char *)NULL);
xfree(cp);
public = key_load_public(filename, NULL);
options.identity_files[i] = filename;
options.identity_keys[i] = public;
}
-}
-
-static void
-control_client_sighandler(int signo)
-{
- control_client_terminate = signo;
-}
-
-static void
-control_client_sigrelay(int signo)
-{
- if (control_server_pid > 1)
- kill(control_server_pid, signo);
-}
-
-static int
-env_permitted(char *env)
-{
- int i;
- char name[1024], *cp;
-
- if (strlcpy(name, env, sizeof(name)) >= sizeof(name))
- fatal("env_permitted: name too long");
- if ((cp = strchr(name, '=')) == NULL)
- return (0);
-
- *cp = '\0';
-
- for (i = 0; i < options.num_send_env; i++)
- if (match_pattern(name, options.send_env[i]))
- return (1);
-
- return (0);
-}
-
-static void
-control_client(const char *path)
-{
- struct sockaddr_un addr;
- int i, r, fd, sock, exitval, num_env, addr_len;
- Buffer m;
- char *term;
- extern char **environ;
- u_int flags;
-
- if (mux_command == 0)
- mux_command = SSHMUX_COMMAND_OPEN;
-
- switch (options.control_master) {
- case SSHCTL_MASTER_AUTO:
- case SSHCTL_MASTER_AUTO_ASK:
- debug("auto-mux: Trying existing master");
- /* FALLTHROUGH */
- case SSHCTL_MASTER_NO:
- break;
- default:
- return;
- }
-
- memset(&addr, '\0', sizeof(addr));
- addr.sun_family = AF_UNIX;
- addr_len = offsetof(struct sockaddr_un, sun_path) +
- strlen(path) + 1;
-
- if (strlcpy(addr.sun_path, path,
- sizeof(addr.sun_path)) >= sizeof(addr.sun_path))
- fatal("ControlPath too long");
-
- if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) < 0)
- fatal("%s socket(): %s", __func__, strerror(errno));
-
- if (connect(sock, (struct sockaddr *)&addr, addr_len) == -1) {
- if (mux_command != SSHMUX_COMMAND_OPEN) {
- fatal("Control socket connect(%.100s): %s", path,
- strerror(errno));
- }
- if (errno == ENOENT)
- debug("Control socket \"%.100s\" does not exist", path);
- else {
- error("Control socket connect(%.100s): %s", path,
- strerror(errno));
- }
- close(sock);
- return;
- }
-
- if (stdin_null_flag) {
- if ((fd = open(_PATH_DEVNULL, O_RDONLY)) == -1)
- fatal("open(/dev/null): %s", strerror(errno));
- if (dup2(fd, STDIN_FILENO) == -1)
- fatal("dup2: %s", strerror(errno));
- if (fd > STDERR_FILENO)
- close(fd);
- }
-
- term = getenv("TERM");
-
- flags = 0;
- if (tty_flag)
- flags |= SSHMUX_FLAG_TTY;
- if (subsystem_flag)
- flags |= SSHMUX_FLAG_SUBSYS;
- if (options.forward_x11)
- flags |= SSHMUX_FLAG_X11_FWD;
- if (options.forward_agent)
- flags |= SSHMUX_FLAG_AGENT_FWD;
-
- buffer_init(&m);
-
- /* Send our command to server */
- buffer_put_int(&m, mux_command);
- buffer_put_int(&m, flags);
- if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
- fatal("%s: msg_send", __func__);
- buffer_clear(&m);
-
- /* Get authorisation status and PID of controlee */
- if (ssh_msg_recv(sock, &m) == -1)
- fatal("%s: msg_recv", __func__);
- if (buffer_get_char(&m) != SSHMUX_VER)
- fatal("%s: wrong version", __func__);
- if (buffer_get_int(&m) != 1)
- fatal("Connection to master denied");
- control_server_pid = buffer_get_int(&m);
-
- buffer_clear(&m);
-
- switch (mux_command) {
- case SSHMUX_COMMAND_ALIVE_CHECK:
- fprintf(stderr, "Master running (pid=%d)\r\n",
- control_server_pid);
- exit(0);
- case SSHMUX_COMMAND_TERMINATE:
- fprintf(stderr, "Exit request sent.\r\n");
- exit(0);
- case SSHMUX_COMMAND_OPEN:
- /* continue below */
- break;
- default:
- fatal("silly mux_command %d", mux_command);
- }
-
- /* SSHMUX_COMMAND_OPEN */
- buffer_put_cstring(&m, term ? term : "");
- buffer_append(&command, "\0", 1);
- buffer_put_cstring(&m, buffer_ptr(&command));
-
- if (options.num_send_env == 0 || environ == NULL) {
- buffer_put_int(&m, 0);
- } else {
- /* Pass environment */
- num_env = 0;
- for (i = 0; environ[i] != NULL; i++)
- if (env_permitted(environ[i]))
- num_env++; /* Count */
-
- buffer_put_int(&m, num_env);
-
- for (i = 0; environ[i] != NULL && num_env >= 0; i++)
- if (env_permitted(environ[i])) {
- num_env--;
- buffer_put_cstring(&m, environ[i]);
- }
- }
-
- if (ssh_msg_send(sock, SSHMUX_VER, &m) == -1)
- fatal("%s: msg_send", __func__);
-
- mm_send_fd(sock, STDIN_FILENO);
- mm_send_fd(sock, STDOUT_FILENO);
- mm_send_fd(sock, STDERR_FILENO);
-
- /* Wait for reply, so master has a chance to gather ttymodes */
- buffer_clear(&m);
- if (ssh_msg_recv(sock, &m) == -1)
- fatal("%s: msg_recv", __func__);
- if (buffer_get_char(&m) != SSHMUX_VER)
- fatal("%s: wrong version", __func__);
- buffer_free(&m);
-
- signal(SIGHUP, control_client_sighandler);
- signal(SIGINT, control_client_sighandler);
- signal(SIGTERM, control_client_sighandler);
- signal(SIGWINCH, control_client_sigrelay);
-
- if (tty_flag)
- enter_raw_mode();
-
- /* Stick around until the controlee closes the client_fd */
- exitval = 0;
- for (;!control_client_terminate;) {
- r = read(sock, &exitval, sizeof(exitval));
- if (r == 0) {
- debug2("Received EOF from master");
- break;
- }
- if (r > 0)
- debug2("Received exit status from master %d", exitval);
- if (r == -1 && errno != EINTR)
- fatal("%s: read %s", __func__, strerror(errno));
- }
-
- if (control_client_terminate)
- debug2("Exiting on signal %d", control_client_terminate);
-
- close(sock);
-
- leave_raw_mode();
-
- if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
- fprintf(stderr, "Connection to master closed.\r\n");
-
- exit(exitval);
+ bzero(pwname, strlen(pwname));
+ xfree(pwname);
+ bzero(pwdir, strlen(pwdir));
+ xfree(pwdir);
}
andersk / openssh.git / blobdiff