* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
- * Created: Sat Mar 18 16:36:11 1995 ylo
* Ssh client program. This program can be used to log into a remote machine.
* The software supports strong authentication, encryption, and forwarding
* of X11, TCP/IP, and authentication connections.
*
- * Modified to work with SSL by Niels Provos <provos@citi.umich.edu> in Canada.
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ *
+ * Copyright (c) 1999 Niels Provos. All rights reserved.
+ * Copyright (c) 2000, 2001, 2002, 2003 Markus Friedl. All rights reserved.
+ *
+ * Modified to work with SSL by Niels Provos <provos@citi.umich.edu>
+ * in Canada (German citizen).
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "includes.h"
-RCSID("$Id$");
+RCSID("$OpenBSD: ssh.c,v 1.240 2005/05/27 08:30:37 djm Exp $");
#include <openssl/evp.h>
-#include <openssl/dsa.h>
-#include <openssl/rsa.h>
+#include <openssl/err.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 "authfile.h"
+#include "pathnames.h"
+#include "dispatch.h"
+#include "clientloop.h"
+#include "log.h"
#include "readconf.h"
+#include "sshconnect.h"
+#include "misc.h"
+#include "kex.h"
+#include "mac.h"
+#include "sshpty.h"
+#include "match.h"
+#include "msg.h"
+#include "monitor_fdpass.h"
#include "uidswap.h"
-#include "ssh2.h"
-#include "compat.h"
-#include "channels.h"
-#include "key.h"
-#include "authfile.h"
+#ifdef SMARTCARD
+#include "scard.h"
+#endif
-#ifdef HAVE___PROGNAME
extern char *__progname;
-#else /* HAVE___PROGNAME */
-static const char *__progname = "ssh";
-#endif /* HAVE___PROGNAME */
-
-/* Flag indicating whether IPv4 or IPv6. This can be set on the command line.
- Default value is AF_UNSPEC means both IPv4 and IPv6. */
-#ifdef IPV4_DEFAULT
-int IPv4or6 = AF_INET;
-#else
-int IPv4or6 = AF_UNSPEC;
-#endif
/* Flag indicating whether debug mode is on. This can be set on the command line. */
int debug_flag = 0;
/* Flag indicating whether a tty should be allocated */
int tty_flag = 0;
+int no_tty_flag = 0;
+int force_tty_flag = 0;
/* don't exec a shell */
int no_shell_flag = 0;
-int no_tty_flag = 0;
/*
* Flag indicating that nothing should be read from stdin. This can be set
/*
* Flag indicating that ssh should fork after authentication. This is useful
- * so that the pasphrase can be entered manually, and then ssh goes to the
+ * so that the passphrase can be entered manually, and then ssh goes to the
* background.
*/
int fork_after_authentication_flag = 0;
*/
Options options;
+/* optional user configfile */
+char *config = NULL;
+
/*
* 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
/* socket address the host resolves to */
struct sockaddr_storage hostaddr;
-/*
- * Flag to indicate that we have received a window change signal which has
- * not yet been processed. This will cause a message indicating the new
- * window size to be sent to the server a little later. This is volatile
- * because this is updated in a signal handler.
- */
-volatile int received_window_change_signal = 0;
-
-/* Value of argv[0] (set in the main program). */
-char *av0;
-
-/* Flag indicating whether we have a valid host private key loaded. */
-int host_private_key_loaded = 0;
-
-/* Host private key. */
-RSA *host_private_key = NULL;
+/* Private host keys. */
+Sensitive sensitive_data;
/* Original real UID. */
uid_t original_real_uid;
+uid_t original_effective_uid;
/* command to be executed */
Buffer command;
-/* Prints a help message to the user. This function never returns. */
+/* Should we execute a command or invoke a subsystem? */
+int subsystem_flag = 0;
-void
-usage()
-{
- fprintf(stderr, "Usage: %s [options] host [command]\n", av0);
- fprintf(stderr, "Options:\n");
- fprintf(stderr, " -l user Log in using this user name.\n");
- fprintf(stderr, " -n Redirect input from /dev/null.\n");
- fprintf(stderr, " -a Disable authentication agent forwarding.\n");
-#ifdef AFS
- fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
-#endif /* AFS */
- fprintf(stderr, " -x Disable X11 connection forwarding.\n");
- fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\n");
- fprintf(stderr, " -t Tty; allocate a tty even if command is given.\n");
- fprintf(stderr, " -T Do not allocate a tty.\n");
- fprintf(stderr, " -v Verbose; display verbose debugging messages.\n");
- fprintf(stderr, " -V Display version number only.\n");
- fprintf(stderr, " -P Don't allocate a privileged port.\n");
- fprintf(stderr, " -q Quiet; don't display any warning messages.\n");
- fprintf(stderr, " -f Fork into background after authentication.\n");
- fprintf(stderr, " -e char Set escape character; ``none'' = disable (default: ~).\n");
-
- fprintf(stderr, " -c cipher Select encryption algorithm: "
- "``3des'', "
- "``blowfish''\n");
- fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\n");
- fprintf(stderr, " -L listen-port:host:port Forward local port to remote address\n");
- fprintf(stderr, " -R listen-port:host:port Forward remote port to local address\n");
- fprintf(stderr, " These cause %s to listen for connections on a port, and\n", av0);
- fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
- fprintf(stderr, " -C Enable compression.\n");
- fprintf(stderr, " -N Do not execute a shell or command.\n");
- fprintf(stderr, " -g Allow remote hosts to connect to forwarded ports.\n");
- fprintf(stderr, " -4 Use IPv4 only.\n");
- fprintf(stderr, " -6 Use IPv6 only.\n");
- fprintf(stderr, " -2 Force protocol version 2.\n");
- fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
- exit(1);
-}
+/* # of replies received for global requests */
+static int client_global_request_id = 0;
-/*
- * Connects to the given host using rsh (or prints an error message and exits
- * if rsh is not available). This function never returns.
- */
-void
-rsh_connect(char *host, char *user, Buffer * command)
-{
- char *args[10];
- int i;
+/* pid of proxycommand child process */
+pid_t proxy_command_pid = 0;
- log("Using rsh. WARNING: Connection will not be encrypted.");
- /* Build argument list for rsh. */
- i = 0;
- args[i++] = _PATH_RSH;
- /* host may have to come after user on some systems */
- args[i++] = host;
- if (user) {
- args[i++] = "-l";
- args[i++] = user;
- }
- if (buffer_len(command) > 0) {
- buffer_append(command, "\0", 1);
- args[i++] = buffer_ptr(command);
- }
- args[i++] = NULL;
- if (debug_flag) {
- for (i = 0; args[i]; i++) {
- if (i != 0)
- fprintf(stderr, " ");
- fprintf(stderr, "%s", args[i]);
- }
- fprintf(stderr, "\n");
- }
- execv(_PATH_RSH, args);
- perror(_PATH_RSH);
+/* 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;
+
+/* Prints a help message to the user. This function never returns. */
+
+static void
+usage(void)
+{
+ fprintf(stderr,
+"usage: ssh [-1246AaCfgkMNnqsTtVvXxY] [-b bind_address] [-c cipher_spec]\n"
+" [-D 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"
+" [user@]hostname [command]\n"
+ );
exit(1);
}
-int ssh_session(void);
-int ssh_session2(void);
+static int ssh_session(void);
+static int ssh_session2(void);
+static void load_public_identity_files(void);
+static void control_client(const char *path);
/*
* Main program for the ssh client.
int
main(int ac, char **av)
{
- int i, opt, optind, exit_status, ok;
- u_short fwd_port, fwd_host_port;
- char *optarg, *cp, buf[256];
+ int i, opt, exit_status;
+ char *p, *cp, *line, buf[256];
struct stat st;
- struct passwd *pw, pwcopy;
+ struct passwd *pw;
int dummy;
- uid_t original_effective_uid;
+ extern int optind, optreset;
+ extern char *optarg;
+ Forward fwd;
+
+ __progname = ssh_get_progname(av[0]);
+ init_rng();
/*
* Save the original real uid. It will be needed later (uid-swapping
original_real_uid = getuid();
original_effective_uid = geteuid();
- /* If we are installed setuid root be careful to not drop core. */
- if (original_real_uid != original_effective_uid) {
- struct rlimit rlim;
- rlim.rlim_cur = rlim.rlim_max = 0;
- if (setrlimit(RLIMIT_CORE, &rlim) < 0)
- fatal("setrlimit failed: %.100s", strerror(errno));
- }
/*
* Use uid-swapping to give up root privileges for the duration of
* option processing. We will re-instantiate the rights when we are
* them when the port has been created (actually, when the connection
* has been made, as we may need to create the port several times).
*/
- temporarily_use_uid(original_real_uid);
+ PRIV_END;
+
+#ifdef HAVE_SETRLIMIT
+ /* If we are installed setuid root be careful to not drop core. */
+ if (original_real_uid != original_effective_uid) {
+ struct rlimit rlim;
+ rlim.rlim_cur = rlim.rlim_max = 0;
+ if (setrlimit(RLIMIT_CORE, &rlim) < 0)
+ fatal("setrlimit failed: %.100s", strerror(errno));
+ }
+#endif
+ /* Get user data. */
+ pw = getpwuid(original_real_uid);
+ if (!pw) {
+ logit("You don't exist, go away!");
+ exit(1);
+ }
+ /* Take a copy of the returned structure. */
+ pw = pwcopy(pw);
/*
* Set our umask to something reasonable, as some files are created
*/
umask(022);
- /* Save our own name. */
- av0 = av[0];
-
/* Initialize option structure to indicate that no values have been set. */
initialize_options(&options);
/* Parse command-line arguments. */
host = NULL;
- /* If program name is not one of the standard names, use it as host name. */
- if (strchr(av0, '/'))
- cp = strrchr(av0, '/') + 1;
- else
- cp = av0;
- if (strcmp(cp, "rsh") != 0 && strcmp(cp, "ssh") != 0 &&
- strcmp(cp, "rlogin") != 0 && strcmp(cp, "slogin") != 0)
- host = cp;
-
- for (optind = 1; optind < ac; optind++) {
- if (av[optind][0] != '-') {
- if (host)
- break;
- if ((cp = strchr(av[optind], '@'))) {
- if(cp == av[optind])
- usage();
- options.user = av[optind];
- *cp = '\0';
- host = ++cp;
- } else
- host = av[optind];
- continue;
- }
- opt = av[optind][1];
- if (!opt)
- usage();
- if (strchr("eilcpLRo", opt)) { /* options with arguments */
- optarg = av[optind] + 2;
- if (strcmp(optarg, "") == 0) {
- if (optind >= ac - 1)
- usage();
- optarg = av[++optind];
- }
- } else {
- if (av[optind][2])
- usage();
- optarg = NULL;
- }
+again:
+ while ((opt = getopt(ac, av,
+ "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:MNO:PR:S:TVXY")) != -1) {
switch (opt) {
+ case '1':
+ options.protocol = SSH_PROTO_1;
+ break;
case '2':
options.protocol = SSH_PROTO_2;
break;
case '4':
- IPv4or6 = AF_INET;
+ options.address_family = AF_INET;
break;
case '6':
- IPv4or6 = AF_INET6;
+ options.address_family = AF_INET6;
break;
case 'n':
stdin_null_flag = 1;
case 'X':
options.forward_x11 = 1;
break;
+ case 'Y':
+ options.forward_x11 = 1;
+ options.forward_x11_trusted = 1;
+ break;
case 'g':
options.gateway_ports = 1;
break;
- case 'P':
+ case 'O':
+ if (strcmp(optarg, "check") == 0)
+ mux_command = SSHMUX_COMMAND_ALIVE_CHECK;
+ else if (strcmp(optarg, "exit") == 0)
+ mux_command = SSHMUX_COMMAND_TERMINATE;
+ else
+ fatal("Invalid multiplex command.");
+ break;
+ case 'P': /* deprecated */
options.use_privileged_port = 0;
break;
case 'a':
options.forward_agent = 0;
break;
-#ifdef AFS
+ case 'A':
+ options.forward_agent = 1;
+ break;
case 'k':
- options.kerberos_tgt_passing = 0;
- options.afs_token_passing = 0;
+ options.gss_deleg_creds = 0;
break;
-#endif
case 'i':
if (stat(optarg, &st) < 0) {
- fprintf(stderr, "Warning: Identity file %s does not exist.\n",
- optarg);
+ fprintf(stderr, "Warning: Identity file %s "
+ "not accessible: %s.\n", optarg,
+ strerror(errno));
break;
}
- if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES)
- fatal("Too many identity files specified (max %d)",
- SSH_MAX_IDENTITY_FILES);
+ if (options.num_identity_files >=
+ SSH_MAX_IDENTITY_FILES)
+ fatal("Too many identity files specified "
+ "(max %d)", SSH_MAX_IDENTITY_FILES);
options.identity_files[options.num_identity_files++] =
- xstrdup(optarg);
+ xstrdup(optarg);
+ break;
+ case 'I':
+#ifdef SMARTCARD
+ options.smartcard_device = xstrdup(optarg);
+#else
+ fprintf(stderr, "no support for smartcards.\n");
+#endif
break;
case 't':
+ if (tty_flag)
+ force_tty_flag = 1;
tty_flag = 1;
break;
case 'v':
+ if (debug_flag == 0) {
+ debug_flag = 1;
+ options.log_level = SYSLOG_LEVEL_DEBUG1;
+ } else {
+ if (options.log_level < SYSLOG_LEVEL_DEBUG3)
+ options.log_level++;
+ break;
+ }
+ /* FALLTHROUGH */
case 'V':
- fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n",
- SSH_VERSION,
- PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
- PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2);
- fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay());
+ fprintf(stderr, "%s, %s\n",
+ SSH_RELEASE, SSLeay_version(SSLEAY_VERSION));
if (opt == 'V')
exit(0);
- debug_flag = 1;
- options.log_level = SYSLOG_LEVEL_DEBUG;
break;
case 'q':
options.log_level = SYSLOG_LEVEL_QUIET;
break;
case 'e':
if (optarg[0] == '^' && optarg[2] == 0 &&
- (unsigned char) optarg[1] >= 64 && (unsigned char) optarg[1] < 128)
- options.escape_char = (unsigned char) optarg[1] & 31;
+ (u_char) optarg[1] >= 64 &&
+ (u_char) optarg[1] < 128)
+ options.escape_char = (u_char) optarg[1] & 31;
else if (strlen(optarg) == 1)
- options.escape_char = (unsigned char) optarg[0];
+ options.escape_char = (u_char) optarg[0];
else if (strcmp(optarg, "none") == 0)
- options.escape_char = -2;
+ options.escape_char = SSH_ESCAPECHAR_NONE;
else {
- fprintf(stderr, "Bad escape character '%s'.\n", optarg);
+ fprintf(stderr, "Bad escape character '%s'.\n",
+ optarg);
exit(1);
}
break;
if (ciphers_valid(optarg)) {
/* SSH2 only */
options.ciphers = xstrdup(optarg);
+ options.cipher = SSH_CIPHER_INVALID;
} else {
/* SSH1 only */
options.cipher = cipher_number(optarg);
if (options.cipher == -1) {
- fprintf(stderr, "Unknown cipher type '%s'\n", optarg);
+ fprintf(stderr,
+ "Unknown cipher type '%s'\n",
+ optarg);
exit(1);
}
+ if (options.cipher == SSH_CIPHER_3DES)
+ options.ciphers = "3des-cbc";
+ else if (options.cipher == SSH_CIPHER_BLOWFISH)
+ options.ciphers = "blowfish-cbc";
+ else
+ options.ciphers = (char *)-1;
+ }
+ break;
+ case 'm':
+ if (mac_valid(optarg))
+ options.macs = xstrdup(optarg);
+ else {
+ fprintf(stderr, "Unknown mac type '%s'\n",
+ optarg);
+ exit(1);
}
break;
+ case 'M':
+ options.control_master =
+ (options.control_master >= 1) ? 2 : 1;
+ break;
case 'p':
- options.port = atoi(optarg);
+ options.port = a2port(optarg);
+ if (options.port == 0) {
+ fprintf(stderr, "Bad port '%s'\n", optarg);
+ exit(1);
+ }
break;
case 'l':
options.user = optarg;
break;
+
+ case 'L':
+ if (parse_forward(&fwd, optarg))
+ add_local_forward(&options, &fwd);
+ else {
+ fprintf(stderr,
+ "Bad local forwarding specification '%s'\n",
+ optarg);
+ exit(1);
+ }
+ break;
+
case 'R':
- if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
- &fwd_host_port) != 3 &&
- sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
- &fwd_host_port) != 3) {
- fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
- usage();
- /* NOTREACHED */
+ if (parse_forward(&fwd, optarg)) {
+ add_remote_forward(&options, &fwd);
+ } else {
+ fprintf(stderr,
+ "Bad remote forwarding specification "
+ "'%s'\n", optarg);
+ exit(1);
}
- add_remote_forward(&options, fwd_port, buf, fwd_host_port);
break;
- case 'L':
- if (sscanf(optarg, "%hu/%255[^/]/%hu", &fwd_port, buf,
- &fwd_host_port) != 3 &&
- sscanf(optarg, "%hu:%255[^:]:%hu", &fwd_port, buf,
- &fwd_host_port) != 3) {
- fprintf(stderr, "Bad forwarding specification '%s'.\n", optarg);
- usage();
- /* NOTREACHED */
+
+ case 'D':
+ cp = p = xstrdup(optarg);
+ memset(&fwd, '\0', sizeof(fwd));
+ fwd.connect_host = "socks";
+ if ((fwd.listen_host = hpdelim(&cp)) == NULL) {
+ fprintf(stderr, "Bad dynamic forwarding "
+ "specification '%.100s'\n", optarg);
+ exit(1);
+ }
+ if (cp != NULL) {
+ fwd.listen_port = a2port(cp);
+ fwd.listen_host = cleanhostname(fwd.listen_host);
+ } else {
+ fwd.listen_port = a2port(fwd.listen_host);
+ fwd.listen_host = "";
+ }
+
+ if (fwd.listen_port == 0) {
+ fprintf(stderr, "Bad dynamic port '%s'\n",
+ optarg);
+ exit(1);
}
- add_local_forward(&options, fwd_port, buf, fwd_host_port);
+ add_local_forward(&options, &fwd);
+ xfree(p);
break;
+
case 'C':
options.compression = 1;
break;
break;
case 'o':
dummy = 1;
- if (process_config_line(&options, host ? host : "", optarg,
- "command-line", 0, &dummy) != 0)
+ line = xstrdup(optarg);
+ if (process_config_line(&options, host ? host : "",
+ line, "command-line", 0, &dummy) != 0)
exit(1);
+ xfree(line);
+ break;
+ case 's':
+ subsystem_flag = 1;
+ break;
+ case 'S':
+ if (options.control_path != NULL)
+ free(options.control_path);
+ options.control_path = xstrdup(optarg);
+ break;
+ case 'b':
+ options.bind_address = optarg;
+ break;
+ case 'F':
+ config = optarg;
break;
default:
usage();
}
}
+ ac -= optind;
+ av += optind;
+
+ if (ac > 0 && !host && **av != '-') {
+ if (strrchr(*av, '@')) {
+ p = xstrdup(*av);
+ cp = strrchr(p, '@');
+ if (cp == NULL || cp == p)
+ usage();
+ options.user = p;
+ *cp = '\0';
+ host = ++cp;
+ } else
+ host = *av;
+ if (ac > 1) {
+ optind = optreset = 1;
+ goto again;
+ }
+ ac--, av++;
+ }
+
/* Check that we got a host name. */
if (!host)
usage();
+ SSLeay_add_all_algorithms();
+ ERR_load_crypto_strings();
+
/* Initialize the command to execute on remote host. */
buffer_init(&command);
- OpenSSL_add_all_algorithms();
-
/*
* Save the command to execute on the remote host in a buffer. There
* is no limit on the length of the command, except by the maximum
* packet size. Also sets the tty flag if there is no command.
*/
- if (optind == ac) {
+ if (!ac) {
/* No command specified - execute shell on a tty. */
tty_flag = 1;
+ if (subsystem_flag) {
+ fprintf(stderr,
+ "You must specify a subsystem to invoke.\n");
+ usage();
+ }
} else {
- /* A command has been specified. Store it into the
- buffer. */
- for (i = optind; i < ac; i++) {
- if (i > optind)
+ /* A command has been specified. Store it into the buffer. */
+ for (i = 0; i < ac; i++) {
+ if (i)
buffer_append(&command, " ", 1);
buffer_append(&command, av[i], strlen(av[i]));
}
}
/* Cannot fork to background if no command. */
- if (fork_after_authentication_flag && buffer_len(&command) == 0)
+ if (fork_after_authentication_flag && buffer_len(&command) == 0 && !no_shell_flag)
fatal("Cannot fork into background without a command to execute.");
/* Allocate a tty by default if no command specified. */
if (buffer_len(&command) == 0)
tty_flag = 1;
+ /* Force no tty */
+ if (no_tty_flag)
+ tty_flag = 0;
/* Do not allocate a tty if stdin is not a tty. */
- if (!isatty(fileno(stdin))) {
+ if ((!isatty(fileno(stdin)) || stdin_null_flag) && !force_tty_flag) {
if (tty_flag)
- fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n");
+ logit("Pseudo-terminal will not be allocated because stdin is not a terminal.");
tty_flag = 0;
}
- /* force */
- if (no_tty_flag)
- tty_flag = 0;
- /* Get user data. */
- pw = getpwuid(original_real_uid);
- if (!pw) {
- fprintf(stderr, "You don't exist, go away!\n");
- exit(1);
+ /*
+ * Initialize "log" output. Since we are the client all output
+ * actually goes to stderr.
+ */
+ log_init(av[0], options.log_level == -1 ? SYSLOG_LEVEL_INFO : options.log_level,
+ SYSLOG_FACILITY_USER, 1);
+
+ /*
+ * Read per-user configuration file. Ignore the system wide config
+ * file if the user specifies a config file on the command line.
+ */
+ if (config != NULL) {
+ if (!read_config_file(config, host, &options, 0))
+ fatal("Can't open user config file %.100s: "
+ "%.100s", config, strerror(errno));
+ } else {
+ snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir,
+ _PATH_SSH_USER_CONFFILE);
+ (void)read_config_file(buf, host, &options, 1);
+
+ /* Read systemwide configuration file after use config. */
+ (void)read_config_file(_PATH_HOST_CONFIG_FILE, host,
+ &options, 0);
}
- /* Take a copy of the returned structure. */
- memset(&pwcopy, 0, sizeof(pwcopy));
- pwcopy.pw_name = xstrdup(pw->pw_name);
- pwcopy.pw_passwd = xstrdup(pw->pw_passwd);
- pwcopy.pw_uid = pw->pw_uid;
- pwcopy.pw_gid = pw->pw_gid;
- pwcopy.pw_dir = xstrdup(pw->pw_dir);
- pwcopy.pw_shell = xstrdup(pw->pw_shell);
- pw = &pwcopy;
-
- /* Initialize "log" output. Since we are the client all output
- actually goes to the terminal. */
- log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
-
- /* Read per-user configuration file. */
- snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE);
- read_config_file(buf, host, &options);
-
- /* Read systemwide configuration file. */
- read_config_file(HOST_CONFIG_FILE, host, &options);
/* Fill configuration defaults. */
fill_default_options(&options);
+ channel_set_af(options.address_family);
+
/* reinit */
- log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
+ log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
- /* check if RSA support exists */
- if ((options.protocol & SSH_PROTO_1) &&
- rsa_alive() == 0) {
- log("%s: no RSA support in libssl and libcrypto. See ssl(8).",
- __progname);
- log("Disabling protocol version 1");
- options.protocol &= ~ (SSH_PROTO_1|SSH_PROTO_1_PREFERRED);
- }
- if (! options.protocol & (SSH_PROTO_1|SSH_PROTO_2)) {
- fprintf(stderr, "%s: No protocol version available.\n",
- __progname);
- exit(1);
- }
+ seed_rng();
if (options.user == NULL)
options.user = xstrdup(pw->pw_name);
if (options.hostname != NULL)
host = options.hostname;
- /* Find canonic host name. */
- if (strchr(host, '.') == 0) {
- struct addrinfo hints;
- struct addrinfo *ai = NULL;
- int errgai;
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = IPv4or6;
- hints.ai_flags = AI_CANONNAME;
- hints.ai_socktype = SOCK_STREAM;
- errgai = getaddrinfo(host, NULL, &hints, &ai);
- if (errgai == 0) {
- if (ai->ai_canonname != NULL)
- host = xstrdup(ai->ai_canonname);
- freeaddrinfo(ai);
- }
+ /* force lowercase for hostkey matching */
+ if (options.host_key_alias != NULL) {
+ for (p = options.host_key_alias; *p; p++)
+ if (isupper(*p))
+ *p = tolower(*p);
}
- /* Disable rhosts authentication if not running as root. */
- if (original_effective_uid != 0 || !options.use_privileged_port) {
- options.rhosts_authentication = 0;
- options.rhosts_rsa_authentication = 0;
- }
- /*
- * If using rsh has been selected, exec it now (without trying
- * anything else). Note that we must release privileges first.
- */
- if (options.use_rsh) {
- /*
- * Restore our superuser privileges. This must be done
- * before permanently setting the uid.
- */
- restore_uid();
- /* Switch to the original uid permanently. */
- permanently_set_uid(original_real_uid);
+ if (options.proxy_command != NULL &&
+ strcmp(options.proxy_command, "none") == 0)
+ options.proxy_command = NULL;
- /* Execute rsh. */
- rsh_connect(host, options.user, &command);
- fatal("rsh_connect returned");
+ if (options.control_path != NULL) {
+ options.control_path = tilde_expand_filename(
+ options.control_path, original_real_uid);
+ }
+ if (mux_command != 0 && options.control_path == NULL)
+ fatal("No ControlPath specified for \"-O\" command");
+ if (options.control_path != NULL && options.control_master == 0) {
+ if (mux_command == 0)
+ mux_command = SSHMUX_COMMAND_OPEN;
+ control_client(options.control_path);
}
- /* Restore our superuser privileges. */
- restore_uid();
-
- /*
- * Open a connection to the remote host. This needs root privileges
- * if rhosts_{rsa_}authentication is enabled.
- */
- ok = ssh_connect(host, &hostaddr, options.port,
- options.connection_attempts,
- !options.rhosts_authentication &&
- !options.rhosts_rsa_authentication,
- original_real_uid,
- options.proxy_command);
+ /* Open a connection to the remote host. */
+ if (ssh_connect(host, &hostaddr, options.port,
+ options.address_family, options.connection_attempts,
+#ifdef HAVE_CYGWIN
+ options.use_privileged_port,
+#else
+ original_effective_uid == 0 && options.use_privileged_port,
+#endif
+ options.proxy_command) != 0)
+ exit(1);
/*
* If we successfully made the connection, load the host private key
* in case we will need it later for combined rsa-rhosts
* authentication. This must be done before releasing extra
* privileges, because the file is only readable by root.
+ * If we cannot access the private keys, load the public keys
+ * instead and try to execute the ssh-keysign helper instead.
*/
- if (ok && (options.protocol & SSH_PROTO_1)) {
- Key k;
- host_private_key = RSA_new();
- k.type = KEY_RSA;
- k.rsa = host_private_key;
- if (load_private_key(HOST_KEY_FILE, "", &k, NULL))
- host_private_key_loaded = 1;
+ sensitive_data.nkeys = 0;
+ sensitive_data.keys = NULL;
+ sensitive_data.external_keysign = 0;
+ if (options.rhosts_rsa_authentication ||
+ options.hostbased_authentication) {
+ sensitive_data.nkeys = 3;
+ sensitive_data.keys = xmalloc(sensitive_data.nkeys *
+ sizeof(Key));
+
+ PRIV_START;
+ sensitive_data.keys[0] = key_load_private_type(KEY_RSA1,
+ _PATH_HOST_KEY_FILE, "", NULL);
+ sensitive_data.keys[1] = key_load_private_type(KEY_DSA,
+ _PATH_HOST_DSA_KEY_FILE, "", NULL);
+ sensitive_data.keys[2] = key_load_private_type(KEY_RSA,
+ _PATH_HOST_RSA_KEY_FILE, "", NULL);
+ PRIV_END;
+
+ if (options.hostbased_authentication == 1 &&
+ sensitive_data.keys[0] == NULL &&
+ sensitive_data.keys[1] == NULL &&
+ sensitive_data.keys[2] == NULL) {
+ sensitive_data.keys[1] = key_load_public(
+ _PATH_HOST_DSA_KEY_FILE, NULL);
+ sensitive_data.keys[2] = key_load_public(
+ _PATH_HOST_RSA_KEY_FILE, NULL);
+ sensitive_data.external_keysign = 1;
+ }
}
/*
* Get rid of any extra privileges that we may have. We will no
* user's home directory if it happens to be on a NFS volume where
* root is mapped to nobody.
*/
-
- /*
- * Note that some legacy systems need to postpone the following call
- * to permanently_set_uid() until the private hostkey is destroyed
- * with RSA_free(). Otherwise the calling user could ptrace() the
- * process, read the private hostkey and impersonate the host.
- * OpenBSD does not allow ptracing of setuid processes.
- */
- permanently_set_uid(original_real_uid);
+ if (original_effective_uid == 0) {
+ PRIV_START;
+ permanently_set_uid(pw);
+ }
/*
* Now that we are back to our own permissions, create ~/.ssh
* directory if it doesn\'t already exist.
*/
- snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR);
+ snprintf(buf, sizeof buf, "%.100s%s%.100s", pw->pw_dir, strcmp(pw->pw_dir, "/") ? "/" : "", _PATH_SSH_USER_DIR);
if (stat(buf, &st) < 0)
- if (mkdir(buf, 0755) < 0)
+ if (mkdir(buf, 0700) < 0)
error("Could not create directory '%.200s'.", buf);
- /* Check if the connection failed, and try "rsh" if appropriate. */
- if (!ok) {
- if (options.port != 0)
- log("Secure connection to %.100s on port %hu refused%.100s.",
- host, options.port,
- options.fallback_to_rsh ? "; reverting to insecure method" : "");
- else
- log("Secure connection to %.100s refused%.100s.", host,
- options.fallback_to_rsh ? "; reverting to insecure method" : "");
+ /* load options.identity_files */
+ load_public_identity_files();
- if (options.fallback_to_rsh) {
- rsh_connect(host, options.user, &command);
- fatal("rsh_connect returned");
- }
- exit(1);
- }
- /* Expand ~ in options.identity_files. */
- /* XXX mem-leaks */
- for (i = 0; i < options.num_identity_files; i++)
- options.identity_files[i] =
- tilde_expand_filename(options.identity_files[i], original_real_uid);
- for (i = 0; i < options.num_identity_files2; i++)
- options.identity_files2[i] =
- tilde_expand_filename(options.identity_files2[i], original_real_uid);
/* Expand ~ in known host file names. */
- options.system_hostfile = tilde_expand_filename(options.system_hostfile,
- original_real_uid);
- options.user_hostfile = tilde_expand_filename(options.user_hostfile,
- original_real_uid);
- options.system_hostfile2 = tilde_expand_filename(options.system_hostfile2,
- original_real_uid);
- options.user_hostfile2 = tilde_expand_filename(options.user_hostfile2,
- original_real_uid);
+ /* XXX mem-leaks: */
+ options.system_hostfile =
+ tilde_expand_filename(options.system_hostfile, original_real_uid);
+ options.user_hostfile =
+ tilde_expand_filename(options.user_hostfile, original_real_uid);
+ options.system_hostfile2 =
+ tilde_expand_filename(options.system_hostfile2, original_real_uid);
+ options.user_hostfile2 =
+ tilde_expand_filename(options.user_hostfile2, original_real_uid);
+
+ signal(SIGPIPE, SIG_IGN); /* ignore SIGPIPE early */
/* Log into the remote system. This never returns if the login fails. */
- ssh_login(host_private_key_loaded, host_private_key,
- host, (struct sockaddr *)&hostaddr, original_real_uid);
-
- /* We no longer need the host private key. Clear it now. */
- if (host_private_key_loaded)
- RSA_free(host_private_key); /* Destroys contents safely */
+ ssh_login(&sensitive_data, host, (struct sockaddr *)&hostaddr, pw);
+
+ /* We no longer need the private host keys. Clear them now. */
+ if (sensitive_data.nkeys != 0) {
+ for (i = 0; i < sensitive_data.nkeys; i++) {
+ if (sensitive_data.keys[i] != NULL) {
+ /* Destroys contents safely */
+ debug3("clear hostkey %d", i);
+ key_free(sensitive_data.keys[i]);
+ sensitive_data.keys[i] = NULL;
+ }
+ }
+ xfree(sensitive_data.keys);
+ }
+ for (i = 0; i < options.num_identity_files; i++) {
+ if (options.identity_files[i]) {
+ xfree(options.identity_files[i]);
+ options.identity_files[i] = NULL;
+ }
+ if (options.identity_keys[i]) {
+ key_free(options.identity_keys[i]);
+ options.identity_keys[i] = NULL;
+ }
+ }
exit_status = compat20 ? ssh_session2() : ssh_session();
packet_close();
+
+ if (options.control_path != NULL && control_fd != -1)
+ unlink(options.control_path);
+
+ /*
+ * Send SIGHUP to proxy command if used. We don't wait() in
+ * case it hangs and instead rely on init to reap the child
+ */
+ if (proxy_command_pid > 1)
+ kill(proxy_command_pid, SIGHUP);
+
return exit_status;
}
-void
-x11_get_proto(char *proto, int proto_len, char *data, int data_len)
+#define SSH_X11_PROTO "MIT-MAGIC-COOKIE-1"
+
+static void
+x11_get_proto(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, i;
-
-#ifdef XAUTH_PATH
- /* Try to get Xauthority information for the display. */
- snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null",
- XAUTH_PATH, getenv("DISPLAY"));
- f = popen(line, "r");
- if (f && fgets(line, sizeof(line), f) &&
- sscanf(line, "%*s %s %s", proto, data) == 2)
- got_data = 1;
- if (f)
- pclose(f);
-#endif /* XAUTH_PATH */
+ int got_data = 0, generated = 0, do_unlink = 0, i;
+ char *display, *xauthdir, *xauthfile;
+ struct stat st;
+
+ xauthdir = xauthfile = NULL;
+ *_proto = proto;
+ *_data = data;
+ proto[0] = data[0] = '\0';
+
+ if (!options.xauth_location ||
+ (stat(options.xauth_location, &st) == -1)) {
+ debug("No xauth program.");
+ } else {
+ if ((display = getenv("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 (options.forward_x11_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,
+ options.xauth_location, xauthfile, display);
+ debug2("x11_get_proto: %s", cmd);
+ if (system(cmd) == 0)
+ generated = 1;
+ }
+ }
+ snprintf(cmd, sizeof(cmd),
+ "%s %s%s list %s . 2>" _PATH_DEVNULL,
+ options.xauth_location,
+ 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);
+ }
+
+ 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
* for the local connection.
*/
if (!got_data) {
- u_int32_t rand = 0;
+ u_int32_t rnd = 0;
- strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
+ 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)
- rand = arc4random();
- snprintf(data + 2 * i, data_len - 2 * i, "%02x", rand & 0xff);
- rand >>= 8;
+ rnd = arc4random();
+ snprintf(data + 2 * i, sizeof data - 2 * i, "%02x",
+ rnd & 0xff);
+ rnd >>= 8;
}
}
}
-int
+static void
+ssh_init_forwarding(void)
+{
+ int success = 0;
+ int i;
+
+ /* Initiate local TCP/IP port forwardings. */
+ for (i = 0; i < options.num_local_forwards; i++) {
+ debug("Local connections to %.200s:%d forwarded to remote "
+ "address %.200s:%d",
+ (options.local_forwards[i].listen_host == NULL) ?
+ (options.gateway_ports ? "*" : "LOCALHOST") :
+ options.local_forwards[i].listen_host,
+ options.local_forwards[i].listen_port,
+ options.local_forwards[i].connect_host,
+ options.local_forwards[i].connect_port);
+ success += channel_setup_local_fwd_listener(
+ options.local_forwards[i].listen_host,
+ options.local_forwards[i].listen_port,
+ options.local_forwards[i].connect_host,
+ options.local_forwards[i].connect_port,
+ options.gateway_ports);
+ }
+ if (i > 0 && success == 0)
+ error("Could not request local forwarding.");
+
+ /* Initiate remote TCP/IP port forwardings. */
+ for (i = 0; i < options.num_remote_forwards; i++) {
+ debug("Remote connections from %.200s:%d forwarded to "
+ "local address %.200s:%d",
+ (options.remote_forwards[i].listen_host == NULL) ?
+ (options.gateway_ports ? "*" : "LOCALHOST") :
+ options.remote_forwards[i].listen_host,
+ options.remote_forwards[i].listen_port,
+ options.remote_forwards[i].connect_host,
+ options.remote_forwards[i].connect_port);
+ 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);
+ }
+}
+
+static void
+check_agent_present(void)
+{
+ if (options.forward_agent) {
+ /* Clear agent forwarding if we don\'t have an agent. */
+ if (!ssh_agent_present())
+ options.forward_agent = 0;
+ }
+}
+
+static int
ssh_session(void)
{
int type;
- int i;
- int plen;
int interactive = 0;
int have_tty = 0;
struct winsize ws;
- int authfd;
char *cp;
/* Enable compression if requested. */
packet_put_int(options.compression_level);
packet_send();
packet_write_wait();
- type = packet_read(&plen);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS)
packet_start_compression(options.compression_level);
else if (type == SSH_SMSG_FAILURE)
- log("Warning: Remote host refused compression.");
+ logit("Warning: Remote host refused compression.");
else
packet_disconnect("Protocol error waiting for compression response.");
}
cp = getenv("TERM");
if (!cp)
cp = "";
- packet_put_string(cp, strlen(cp));
+ packet_put_cstring(cp);
/* Store window size in the packet. */
if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
packet_put_int(ws.ws_ypixel);
/* Store tty modes in the packet. */
- tty_make_modes(fileno(stdin));
+ 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(&plen);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS) {
interactive = 1;
have_tty = 1;
} else if (type == SSH_SMSG_FAILURE)
- log("Warning: Remote host failed or refused to allocate a pseudo tty.");
+ 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. */
if (options.forward_x11 && getenv("DISPLAY") != NULL) {
- char proto[512], data[512];
+ char *proto, *data;
/* Get reasonable local authentication information. */
- x11_get_proto(proto, sizeof proto, data, sizeof data);
+ x11_get_proto(&proto, &data);
/* Request forwarding with authentication spoofing. */
debug("Requesting X11 forwarding with authentication spoofing.");
x11_request_forwarding_with_spoofing(0, proto, data);
/* Read response from the server. */
- type = packet_read(&plen);
+ type = packet_read();
if (type == SSH_SMSG_SUCCESS) {
interactive = 1;
} else if (type == SSH_SMSG_FAILURE) {
- log("Warning: Remote host denied X11 forwarding.");
+ 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.keepalives);
-
- /* Clear agent forwarding if we don\'t have an agent. */
- authfd = ssh_get_authentication_socket();
- if (authfd < 0)
- options.forward_agent = 0;
- else
- ssh_close_authentication_socket(authfd);
+ packet_set_interactive(interactive);
/* 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(&plen);
- packet_integrity_check(plen, 0, type);
+ type = packet_read();
+ packet_check_eom();
if (type != SSH_SMSG_SUCCESS)
- log("Warning: Remote host denied authentication agent forwarding.");
- }
- /* Initiate local TCP/IP port forwardings. */
- for (i = 0; i < options.num_local_forwards; i++) {
- debug("Connections to local port %d forwarded to remote address %.200s:%d",
- options.local_forwards[i].port,
- options.local_forwards[i].host,
- options.local_forwards[i].host_port);
- channel_request_local_forwarding(options.local_forwards[i].port,
- options.local_forwards[i].host,
- options.local_forwards[i].host_port,
- options.gateway_ports);
+ logit("Warning: Remote host denied authentication agent forwarding.");
}
- /* Initiate remote TCP/IP port forwardings. */
- for (i = 0; i < options.num_remote_forwards; i++) {
- debug("Connections to remote port %d forwarded to local address %.200s:%d",
- options.remote_forwards[i].port,
- options.remote_forwards[i].host,
- options.remote_forwards[i].host_port);
- channel_request_remote_forwarding(options.remote_forwards[i].port,
- options.remote_forwards[i].host,
- options.remote_forwards[i].host_port);
- }
+ /* Initiate port forwardings. */
+ ssh_init_forwarding();
/* If requested, let ssh continue in the background. */
if (fork_after_authentication_flag)
int len = buffer_len(&command);
if (len > 900)
len = 900;
- debug("Sending command: %.*s", len, buffer_ptr(&command));
+ 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();
}
/* Enter the interactive session. */
- return client_loop(have_tty, tty_flag ? options.escape_char : -1);
+ return client_loop(have_tty, tty_flag ?
+ 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
-init_local_fwd(void)
+client_global_request_reply_fwd(int type, u_int32_t seq, void *ctxt)
{
int i;
- /* Initiate local TCP/IP port forwardings. */
- for (i = 0; i < options.num_local_forwards; i++) {
- debug("Connections to local port %d forwarded to remote address %.200s:%d",
- options.local_forwards[i].port,
- options.local_forwards[i].host,
- options.local_forwards[i].host_port);
- channel_request_local_forwarding(options.local_forwards[i].port,
- options.local_forwards[i].host,
- options.local_forwards[i].host_port,
- options.gateway_ports);
- }
-}
-extern void client_set_session_ident(int id);
+ i = client_global_request_id++;
+ if (i >= options.num_remote_forwards)
+ return;
+ debug("remote forward %s for: listen %d, connect %s:%d",
+ type == SSH2_MSG_REQUEST_SUCCESS ? "success" : "failure",
+ 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);
+}
-void
-client_init(int id, void *arg)
+static void
+ssh_control_listener(void)
{
- int len;
- debug("client_init id %d arg %d", id, (int)arg);
+ struct sockaddr_un addr;
+ mode_t old_umask;
+ int addr_len;
+
+ if (options.control_path == NULL || options.control_master <= 0)
+ return;
+
+ 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\n", __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);
+ else
+ fatal("%s bind(): %s\n", __func__, strerror(errno));
+ }
+ umask(old_umask);
- if (no_shell_flag)
- goto done;
+ if (listen(control_fd, 64) == -1)
+ fatal("%s listen(): %s\n", __func__, strerror(errno));
- if (tty_flag) {
- struct winsize ws;
- char *cp;
- cp = getenv("TERM");
- if (!cp)
- cp = "";
- /* Store window size in the packet. */
- if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
- memset(&ws, 0, sizeof(ws));
+ set_nonblock(control_fd);
+}
- channel_request_start(id, "pty-req", 0);
- packet_put_cstring(cp);
- 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_put_cstring(""); /* XXX: encode terminal modes */
- packet_send();
- /* XXX wait for reply */
- }
- if (options.forward_x11 &&
- getenv("DISPLAY") != NULL) {
- char proto[512], data[512];
+/* request pty/x11/agent/tcpfwd/shell for channel */
+static void
+ssh_session2_setup(int id, void *arg)
+{
+ extern char **environ;
+
+ int interactive = tty_flag;
+ if (options.forward_x11 && getenv("DISPLAY") != NULL) {
+ char *proto, *data;
/* Get reasonable local authentication information. */
- x11_get_proto(proto, sizeof proto, data, sizeof data);
+ x11_get_proto(&proto, &data);
/* Request forwarding with authentication spoofing. */
debug("Requesting X11 forwarding with authentication spoofing.");
x11_request_forwarding_with_spoofing(id, proto, data);
+ interactive = 1;
/* XXX wait for reply */
}
- len = buffer_len(&command);
- if (len > 0) {
- if (len > 900)
- len = 900;
- debug("Sending command: %.*s", len, buffer_ptr(&command));
- channel_request_start(id, "exec", 0);
- packet_put_string(buffer_ptr(&command), len);
+ check_agent_present();
+ if (options.forward_agent) {
+ debug("Requesting authentication agent forwarding.");
+ channel_request_start(id, "auth-agent-req@openssh.com", 0);
packet_send();
+ }
+
+ client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
+ NULL, fileno(stdin), &command, environ, &ssh_subsystem_reply);
+
+ packet_set_interactive(interactive);
+}
+
+/* open new channel for a session */
+static int
+ssh_session2_open(void)
+{
+ Channel *c;
+ int window, packetmax, in, out, err;
+
+ if (stdin_null_flag) {
+ in = open(_PATH_DEVNULL, O_RDONLY);
} else {
- channel_request(id, "shell", 0);
+ in = dup(STDIN_FILENO);
+ }
+ out = dup(STDOUT_FILENO);
+ err = dup(STDERR_FILENO);
+
+ if (in < 0 || out < 0 || err < 0)
+ fatal("dup() in/out/err failed");
+
+ /* enable nonblocking unless tty */
+ if (!isatty(in))
+ set_nonblock(in);
+ if (!isatty(out))
+ set_nonblock(out);
+ if (!isatty(err))
+ set_nonblock(err);
+
+ window = CHAN_SES_WINDOW_DEFAULT;
+ packetmax = CHAN_SES_PACKET_DEFAULT;
+ if (tty_flag) {
+ window >>= 1;
+ packetmax >>= 1;
}
- /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
-done:
- /* register different callback, etc. XXX */
- client_set_session_ident(id);
+ c = channel_new(
+ "session", SSH_CHANNEL_OPENING, in, out, err,
+ window, packetmax, CHAN_EXTENDED_WRITE,
+ "client-session", /*nonblock*/0);
+
+ debug3("ssh_session2_open: channel_new: %d", c->self);
+
+ channel_send_open(c->self);
+ if (!no_shell_flag)
+ channel_register_confirm(c->self, ssh_session2_setup, NULL);
+
+ return c->self;
}
-int
+static int
ssh_session2(void)
{
- int window, packetmax, id;
- int in = dup(STDIN_FILENO);
- int out = dup(STDOUT_FILENO);
- int err = dup(STDERR_FILENO);
+ int id = -1;
- if (in < 0 || out < 0 || err < 0)
- fatal("dump in/out/err failed");
+ /* XXX should be pre-session */
+ ssh_init_forwarding();
+ ssh_control_listener();
- /* should be pre-session */
- init_local_fwd();
-
- window = 32*1024;
- if (tty_flag) {
- packetmax = window/8;
+ if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
+ id = ssh_session2_open();
+
+ /* If requested, let ssh continue in the background. */
+ if (fork_after_authentication_flag)
+ 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 void
+load_public_identity_files(void)
+{
+ char *filename;
+ int i = 0;
+ Key *public;
+#ifdef SMARTCARD
+ Key **keys;
+
+ if (options.smartcard_device != NULL &&
+ options.num_identity_files < SSH_MAX_IDENTITY_FILES &&
+ (keys = sc_get_keys(options.smartcard_device, NULL)) != NULL ) {
+ int count = 0;
+ for (i = 0; keys[i] != NULL; i++) {
+ count++;
+ memmove(&options.identity_files[1], &options.identity_files[0],
+ sizeof(char *) * (SSH_MAX_IDENTITY_FILES - 1));
+ memmove(&options.identity_keys[1], &options.identity_keys[0],
+ sizeof(Key *) * (SSH_MAX_IDENTITY_FILES - 1));
+ options.num_identity_files++;
+ options.identity_keys[0] = keys[i];
+ options.identity_files[0] = sc_get_key_label(keys[i]);
+ }
+ if (options.num_identity_files > SSH_MAX_IDENTITY_FILES)
+ options.num_identity_files = SSH_MAX_IDENTITY_FILES;
+ i = count;
+ xfree(keys);
+ }
+#endif /* SMARTCARD */
+ for (; i < options.num_identity_files; i++) {
+ filename = tilde_expand_filename(options.identity_files[i],
+ original_real_uid);
+ public = key_load_public(filename, NULL);
+ debug("identity file %s type %d", filename,
+ public ? public->type : -1);
+ xfree(options.identity_files[i]);
+ 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;
+
+ strlcpy(name, env, sizeof(name));
+ 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;
+
+ 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);
+ }
+
+ if ((term = getenv("TERM")) == NULL)
+ term = "";
+
+ flags = 0;
+ if (tty_flag)
+ flags |= SSHMUX_FLAG_TTY;
+ if (subsystem_flag)
+ flags |= SSHMUX_FLAG_SUBSYS;
+
+ buffer_init(&m);
+
+ /* Send our command to server */
+ buffer_put_int(&m, mux_command);
+ buffer_put_int(&m, flags);
+ if (ssh_msg_send(sock, /* version */1, &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) != 1)
+ 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);
+ 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 {
- window *= 2;
- packetmax = window/2;
+ /* 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]);
+ }
}
- id = channel_new(
- "session", SSH_CHANNEL_OPENING, in, out, err,
- window, packetmax, CHAN_EXTENDED_WRITE, xstrdup("client-session"));
+ if (ssh_msg_send(sock, /* version */1, &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) != 1)
+ 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();
- channel_open(id);
- channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, client_init, (void *)0);
+ if (tty_flag && options.log_level != SYSLOG_LEVEL_QUIET)
+ fprintf(stderr, "Connection to master closed.\r\n");
- return client_loop(tty_flag, tty_flag ? options.escape_char : -1);
+ exit(exitval);
}
andersk / openssh.git / blobdiff