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-rw-r--r--crypto/openssh/ssh.c1205
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diff --git a/crypto/openssh/ssh.c b/crypto/openssh/ssh.c
deleted file mode 100644
index 7206043941f7a..0000000000000
--- a/crypto/openssh/ssh.c
+++ /dev/null
@@ -1,1205 +0,0 @@
-/*
- * Author: Tatu Ylonen <ylo@cs.hut.fi>
- * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
- * All rights reserved
- * 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.
- *
- * 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 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("$OpenBSD: ssh.c,v 1.190 2003/02/06 09:27:29 markus Exp $");
-
-#include <openssl/evp.h>
-#include <openssl/err.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 "channels.h"
-#include "key.h"
-#include "authfd.h"
-#include "authfile.h"
-#include "pathnames.h"
-#include "clientloop.h"
-#include "log.h"
-#include "readconf.h"
-#include "sshconnect.h"
-#include "tildexpand.h"
-#include "dispatch.h"
-#include "misc.h"
-#include "kex.h"
-#include "mac.h"
-#include "sshtty.h"
-
-#ifdef SMARTCARD
-#include "scard.h"
-#endif
-
-#ifdef HAVE___PROGNAME
-extern char *__progname;
-#else
-char *__progname;
-#endif
-
-/* 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;
-
-/*
- * Flag indicating that nothing should be read from stdin. This can be set
- * on the command line.
- */
-int stdin_null_flag = 0;
-
-/*
- * Flag indicating that ssh should fork after authentication. This is useful
- * so that the passphrase can be entered manually, and then ssh goes to the
- * background.
- */
-int fork_after_authentication_flag = 0;
-
-/*
- * General data structure for command line options and options configurable
- * in configuration files. See readconf.h.
- */
-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
- * configuration file.
- */
-char *host;
-
-/* socket address the host resolves to */
-struct sockaddr_storage hostaddr;
-
-/* 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;
-
-/* Should we execute a command or invoke a subsystem? */
-int subsystem_flag = 0;
-
-/* # of replies received for global requests */
-static int client_global_request_id = 0;
-
-/* pid of proxycommand child process */
-pid_t proxy_command_pid = 0;
-
-/* Prints a help message to the user. This function never returns. */
-
-static void
-usage(void)
-{
- fprintf(stderr, "Usage: %s [options] host [command]\n", __progname);
- fprintf(stderr, "Options:\n");
- fprintf(stderr, " -l user Log in using this user name.\n");
- fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n");
- fprintf(stderr, " -F config Config file (default: ~/%s).\n",
- _PATH_SSH_USER_CONFFILE);
- fprintf(stderr, " -A Enable authentication agent forwarding.\n");
- fprintf(stderr, " -a Disable authentication agent forwarding (default).\n");
-#ifdef AFS
- fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n");
-#endif /* AFS */
- fprintf(stderr, " -X Enable X11 connection forwarding.\n");
- fprintf(stderr, " -x Disable X11 connection forwarding (default).\n");
- fprintf(stderr, " -i file Identity for public key authentication "
- "(default: ~/.ssh/identity)\n");
-#ifdef SMARTCARD
- fprintf(stderr, " -I reader Set smartcard reader.\n");
-#endif
- 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, " Multiple -v increases verbosity.\n");
- fprintf(stderr, " -V Display version number only.\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\n");
- fprintf(stderr, " -m macs Specify MAC algorithms for protocol version 2.\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", __progname);
- fprintf(stderr, " forward them to the other side by connecting to host:port.\n");
- fprintf(stderr, " -D port Enable dynamic application-level port forwarding.\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, " -1 Force protocol version 1.\n");
- fprintf(stderr, " -2 Force protocol version 2.\n");
- fprintf(stderr, " -4 Use IPv4 only.\n");
- fprintf(stderr, " -6 Use IPv6 only.\n");
- fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n");
- fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n");
- fprintf(stderr, " -b addr Local IP address.\n");
- exit(1);
-}
-
-static int ssh_session(void);
-static int ssh_session2(void);
-static void load_public_identity_files(void);
-
-/*
- * Main program for the ssh client.
- */
-int
-main(int ac, char **av)
-{
- int i, opt, exit_status;
- u_short fwd_port, fwd_host_port;
- char sfwd_port[6], sfwd_host_port[6];
- char *p, *cp, buf[256];
- struct stat st;
- struct passwd *pw;
- int dummy;
- extern int optind, optreset;
- extern char *optarg;
-
- __progname = get_progname(av[0]);
- init_rng();
-
- /*
- * Save the original real uid. It will be needed later (uid-swapping
- * may clobber the real uid).
- */
- original_real_uid = getuid();
- original_effective_uid = geteuid();
-
- /*
- * Use uid-swapping to give up root privileges for the duration of
- * option processing. We will re-instantiate the rights when we are
- * ready to create the privileged port, and will permanently drop
- * them when the port has been created (actually, when the connection
- * has been made, as we may need to create the port several times).
- */
- 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) {
- log("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
- * with the default umask. This will make them world-readable but
- * writable only by the owner, which is ok for all files for which we
- * don't set the modes explicitly.
- */
- umask(022);
-
- /* Initialize option structure to indicate that no values have been set. */
- initialize_options(&options);
-
- /* Parse command-line arguments. */
- host = NULL;
-
-again:
- while ((opt = getopt(ac, av,
- "1246ab:c:e:fgi:kl:m:no:p:qstvxACD:F:I:L:NPR:TVX")) != -1) {
- switch (opt) {
- case '1':
- options.protocol = SSH_PROTO_1;
- break;
- case '2':
- options.protocol = SSH_PROTO_2;
- break;
- case '4':
- IPv4or6 = AF_INET;
- break;
- case '6':
- IPv4or6 = AF_INET6;
- break;
- case 'n':
- stdin_null_flag = 1;
- break;
- case 'f':
- fork_after_authentication_flag = 1;
- stdin_null_flag = 1;
- break;
- case 'x':
- options.forward_x11 = 0;
- break;
- case 'X':
- options.forward_x11 = 1;
- break;
- case 'g':
- options.gateway_ports = 1;
- break;
- case 'P': /* deprecated */
- options.use_privileged_port = 0;
- break;
- case 'a':
- options.forward_agent = 0;
- break;
- case 'A':
- options.forward_agent = 1;
- break;
-#ifdef AFS
- case 'k':
- options.kerberos_tgt_passing = 0;
- options.afs_token_passing = 0;
- break;
-#endif
- case 'i':
- if (stat(optarg, &st) < 0) {
- fprintf(stderr, "Warning: Identity file %s "
- "does not exist.\n", optarg);
- break;
- }
- 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);
- 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 (0 == debug_flag) {
- debug_flag = 1;
- options.log_level = SYSLOG_LEVEL_DEBUG1;
- } else if (options.log_level < SYSLOG_LEVEL_DEBUG3) {
- options.log_level++;
- break;
- } else
- fatal("Too high debugging level.");
- /* fallthrough */
- case 'V':
- fprintf(stderr,
- "%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n",
- SSH_VERSION,
- PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1,
- PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2,
- SSLeay());
- if (opt == 'V')
- exit(0);
- break;
- case 'q':
- options.log_level = SYSLOG_LEVEL_QUIET;
- break;
- case 'e':
- if (optarg[0] == '^' && optarg[2] == 0 &&
- (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 = (u_char) optarg[0];
- else if (strcmp(optarg, "none") == 0)
- options.escape_char = SSH_ESCAPECHAR_NONE;
- else {
- fprintf(stderr, "Bad escape character '%s'.\n",
- optarg);
- exit(1);
- }
- break;
- case 'c':
- if (ciphers_valid(optarg)) {
- /* SSH2 only */
- options.ciphers = xstrdup(optarg);
- options.cipher = SSH_CIPHER_ILLEGAL;
- } else {
- /* SSH1 only */
- options.cipher = cipher_number(optarg);
- if (options.cipher == -1) {
- 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 'p':
- 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':
- case 'R':
- if (sscanf(optarg, "%5[0-9]:%255[^:]:%5[0-9]",
- sfwd_port, buf, sfwd_host_port) != 3 &&
- sscanf(optarg, "%5[0-9]/%255[^/]/%5[0-9]",
- sfwd_port, buf, sfwd_host_port) != 3) {
- fprintf(stderr,
- "Bad forwarding specification '%s'\n",
- optarg);
- usage();
- /* NOTREACHED */
- }
- if ((fwd_port = a2port(sfwd_port)) == 0 ||
- (fwd_host_port = a2port(sfwd_host_port)) == 0) {
- fprintf(stderr,
- "Bad forwarding port(s) '%s'\n", optarg);
- exit(1);
- }
- if (opt == 'L')
- add_local_forward(&options, fwd_port, buf,
- fwd_host_port);
- else if (opt == 'R')
- add_remote_forward(&options, fwd_port, buf,
- fwd_host_port);
- break;
-
- case 'D':
- fwd_port = a2port(optarg);
- if (fwd_port == 0) {
- fprintf(stderr, "Bad dynamic port '%s'\n",
- optarg);
- exit(1);
- }
- add_local_forward(&options, fwd_port, "socks4", 0);
- break;
-
- case 'C':
- options.compression = 1;
- break;
- case 'N':
- no_shell_flag = 1;
- no_tty_flag = 1;
- break;
- case 'T':
- no_tty_flag = 1;
- break;
- case 'o':
- dummy = 1;
- if (process_config_line(&options, host ? host : "",
- optarg, "command-line", 0, &dummy) != 0)
- exit(1);
- break;
- case 's':
- subsystem_flag = 1;
- 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();
- channel_set_af(IPv4or6);
-
- /* Initialize the command to execute on remote host. */
- buffer_init(&command);
-
- /*
- * 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 (!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 = 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 && !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)) && !force_tty_flag) {
- if (tty_flag)
- log("Pseudo-terminal will not be allocated because stdin is not a terminal.");
- tty_flag = 0;
- }
-
- /*
- * 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))
- 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);
-
- /* Read systemwide configuration file after use config. */
- (void)read_config_file(_PATH_HOST_CONFIG_FILE, host, &options);
- }
-
- /* Fill configuration defaults. */
- fill_default_options(&options);
-
- /* reinit */
- log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 1);
-
- seed_rng();
-
- if (options.user == NULL)
- options.user = xstrdup(pw->pw_name);
-
- if (options.hostname != NULL)
- host = options.hostname;
-
- if (options.proxy_command != NULL &&
- strcmp(options.proxy_command, "none") == 0)
- options.proxy_command = NULL;
-
- /* Disable rhosts authentication if not running as root. */
-#ifdef HAVE_CYGWIN
- /* Ignore uid if running under Windows */
- if (!options.use_privileged_port) {
-#else
- if (original_effective_uid != 0 || !options.use_privileged_port) {
-#endif
- debug("Rhosts Authentication disabled, "
- "originating port will not be trusted.");
- options.rhosts_authentication = 0;
- }
- /* Open a connection to the remote host. */
-
- if (ssh_connect(host, &hostaddr, options.port, IPv4or6,
- 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.
- */
- 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
- * longer need them. Also, extra privileges could make it very hard
- * to read identity files and other non-world-readable files from the
- * user's home directory if it happens to be on a NFS volume where
- * root is mapped to nobody.
- */
- seteuid(original_real_uid);
- setuid(original_real_uid);
-
- /*
- * Now that we are back to our own permissions, create ~/.ssh
- * directory if it doesn\'t already exist.
- */
- 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, 0700) < 0)
- error("Could not create directory '%.200s'.", buf);
-
- /* load options.identity_files */
- load_public_identity_files();
-
- /* Expand ~ in known host file names. */
- /* 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(&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();
-
- /*
- * 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;
-}
-
-static void
-x11_get_proto(char **_proto, char **_data)
-{
- char line[512];
- static char proto[512], data[512];
- FILE *f;
- int got_data = 0, i;
- char *display;
- struct stat st;
-
- *_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;
- }
- /* Try to get Xauthority information for the display. */
- if (strncmp(display, "localhost:", 10) == 0)
- /*
- * 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.
- */
- snprintf(line, sizeof line, "%s list unix:%s 2>"
- _PATH_DEVNULL, options.xauth_location, display+10);
- else
- snprintf(line, sizeof line, "%s list %.200s 2>"
- _PATH_DEVNULL, options.xauth_location, display);
- debug2("x11_get_proto: %s", line);
- f = popen(line, "r");
- if (f && fgets(line, sizeof(line), f) &&
- sscanf(line, "%*s %511s %511s", proto, data) == 2)
- got_data = 1;
- if (f)
- pclose(f);
- }
- /*
- * If we didn't get authentication data, just make up some
- * data. The forwarding code will check the validity of the
- * response anyway, and substitute this data. The X11
- * server, however, will ignore this fake data and use
- * whatever authentication mechanisms it was using otherwise
- * for the local connection.
- */
- if (!got_data) {
- u_int32_t rand = 0;
-
- log("Warning: No xauth data; using fake authentication data for X11 forwarding.");
- strlcpy(proto, "MIT-MAGIC-COOKIE-1", sizeof proto);
- for (i = 0; i < 16; i++) {
- if (i % 4 == 0)
- rand = arc4random();
- snprintf(data + 2 * i, sizeof data - 2 * i, "%02x", rand & 0xff);
- rand >>= 8;
- }
- }
-}
-
-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("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);
- success += channel_setup_local_fwd_listener(
- options.local_forwards[i].port,
- options.local_forwards[i].host,
- options.local_forwards[i].host_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("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);
- }
-}
-
-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 interactive = 0;
- int have_tty = 0;
- struct winsize ws;
- char *cp;
-
- /* Enable compression if requested. */
- if (options.compression) {
- debug("Requesting compression at level %d.", options.compression_level);
-
- if (options.compression_level < 1 || options.compression_level > 9)
- fatal("Compression level must be from 1 (fast) to 9 (slow, best).");
-
- /* Send the request. */
- packet_start(SSH_CMSG_REQUEST_COMPRESSION);
- packet_put_int(options.compression_level);
- packet_send();
- packet_write_wait();
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS)
- packet_start_compression(options.compression_level);
- else if (type == SSH_SMSG_FAILURE)
- log("Warning: Remote host refused compression.");
- else
- packet_disconnect("Protocol error waiting for compression response.");
- }
- /* Allocate a pseudo tty if appropriate. */
- if (tty_flag) {
- debug("Requesting pty.");
-
- /* Start the packet. */
- packet_start(SSH_CMSG_REQUEST_PTY);
-
- /* Store TERM in the packet. There is no limit on the
- length of the string. */
- cp = getenv("TERM");
- if (!cp)
- cp = "";
- packet_put_cstring(cp);
-
- /* Store window size in the packet. */
- if (ioctl(fileno(stdin), TIOCGWINSZ, &ws) < 0)
- memset(&ws, 0, sizeof(ws));
- packet_put_int(ws.ws_row);
- packet_put_int(ws.ws_col);
- packet_put_int(ws.ws_xpixel);
- packet_put_int(ws.ws_ypixel);
-
- /* Store tty modes in the packet. */
- tty_make_modes(fileno(stdin), NULL);
-
- /* Send the packet, and wait for it to leave. */
- packet_send();
- packet_write_wait();
-
- /* Read response from the server. */
- type = packet_read();
- if (type == SSH_SMSG_SUCCESS) {
- interactive = 1;
- have_tty = 1;
- } else if (type == SSH_SMSG_FAILURE)
- log("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, *data;
- /* Get reasonable local authentication information. */
- 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();
- if (type == SSH_SMSG_SUCCESS) {
- interactive = 1;
- } else if (type == SSH_SMSG_FAILURE) {
- log("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);
-
- /* Request authentication agent forwarding if appropriate. */
- check_agent_present();
-
- if (options.forward_agent) {
- debug("Requesting authentication agent forwarding.");
- auth_request_forwarding();
-
- /* Read response from the server. */
- type = packet_read();
- packet_check_eom();
- if (type != SSH_SMSG_SUCCESS)
- log("Warning: Remote host denied authentication agent forwarding.");
- }
-
- /* Initiate port forwardings. */
- ssh_init_forwarding();
-
- /* If requested, let ssh continue in the background. */
- if (fork_after_authentication_flag)
- if (daemon(1, 1) < 0)
- fatal("daemon() failed: %.200s", strerror(errno));
-
- /*
- * If a command was specified on the command line, execute the
- * command now. Otherwise request the server to start a shell.
- */
- if (buffer_len(&command) > 0) {
- int len = buffer_len(&command);
- if (len > 900)
- len = 900;
- debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
- packet_start(SSH_CMSG_EXEC_CMD);
- packet_put_string(buffer_ptr(&command), buffer_len(&command));
- packet_send();
- packet_write_wait();
- } else {
- debug("Requesting shell.");
- packet_start(SSH_CMSG_EXEC_SHELL);
- packet_send();
- packet_write_wait();
- }
-
- /* Enter the interactive session. */
- return client_loop(have_tty, tty_flag ?
- options.escape_char : SSH_ESCAPECHAR_NONE, 0);
-}
-
-static void
-client_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(int type, u_int32_t seq, void *ctxt)
-{
- int i;
-
- i = client_global_request_id++;
- if (i >= options.num_remote_forwards) {
- debug("client_global_request_reply: too many replies %d > %d",
- 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].port,
- options.remote_forwards[i].host,
- options.remote_forwards[i].host_port);
- if (type == SSH2_MSG_REQUEST_FAILURE)
- log("Warning: remote port forwarding failed for listen port %d",
- options.remote_forwards[i].port);
-}
-
-/* request pty/x11/agent/tcpfwd/shell for channel */
-static void
-ssh_session2_setup(int id, void *arg)
-{
- int len;
- int interactive = 0;
- struct termios tio;
-
- debug2("ssh_session2_setup: id %d", id);
-
- 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));
-
- 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);
- tio = get_saved_tio();
- tty_make_modes(/*ignored*/ 0, &tio);
- packet_send();
- interactive = 1;
- /* XXX wait for reply */
- }
- if (options.forward_x11 &&
- getenv("DISPLAY") != NULL) {
- char *proto, *data;
- /* Get reasonable local authentication information. */
- 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 */
- }
-
- check_agent_present();
- if (options.forward_agent) {
- debug("Requesting authentication agent forwarding.");
- channel_request_start(id, "auth-agent-req@openssh.com", 0);
- packet_send();
- }
-
- len = buffer_len(&command);
- if (len > 0) {
- if (len > 900)
- len = 900;
- if (subsystem_flag) {
- debug("Sending subsystem: %.*s", len, (u_char *)buffer_ptr(&command));
- channel_request_start(id, "subsystem", /*want reply*/ 1);
- /* register callback for reply */
- /* XXX we assume that client_loop has already been called */
- dispatch_set(SSH2_MSG_CHANNEL_FAILURE, &client_subsystem_reply);
- dispatch_set(SSH2_MSG_CHANNEL_SUCCESS, &client_subsystem_reply);
- } else {
- debug("Sending command: %.*s", len, (u_char *)buffer_ptr(&command));
- channel_request_start(id, "exec", 0);
- }
- packet_put_string(buffer_ptr(&command), buffer_len(&command));
- packet_send();
- } else {
- channel_request_start(id, "shell", 0);
- packet_send();
- }
-
- 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 {
- 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;
- }
- c = channel_new(
- "session", SSH_CHANNEL_OPENING, in, out, err,
- window, packetmax, CHAN_EXTENDED_WRITE,
- xstrdup("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);
-
- return c->self;
-}
-
-static int
-ssh_session2(void)
-{
- int id = -1;
-
- /* XXX should be pre-session */
- ssh_init_forwarding();
-
- if (!no_shell_flag || (datafellows & SSH_BUG_DUMMYCHAN))
- id = ssh_session2_open();
-
- /* If 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] = xstrdup("smartcard key");;
- }
- 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;
- }
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-08-03 05:29:43 +0000