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-rw-r--r--crypto/openssh/ssh.c984
1 files changed, 0 insertions, 984 deletions
diff --git a/crypto/openssh/ssh.c b/crypto/openssh/ssh.c
deleted file mode 100644
index 5708897c013c1..0000000000000
--- a/crypto/openssh/ssh.c
+++ /dev/null
@@ -1,984 +0,0 @@
-/*
- * 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.
- *
- * $FreeBSD$
- */
-
-#include "includes.h"
-RCSID("$Id: ssh.c,v 1.54 2000/05/30 17:32:06 markus Exp $");
-
-#include <openssl/evp.h>
-#include <openssl/dsa.h>
-#include <openssl/rsa.h>
-
-#include "xmalloc.h"
-#include "ssh.h"
-#include "packet.h"
-#include "buffer.h"
-#include "authfd.h"
-#include "readconf.h"
-#include "uidswap.h"
-
-#include "ssh2.h"
-#include "compat.h"
-#include "channels.h"
-#include "key.h"
-#include "authfile.h"
-
-extern char *__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. */
-int IPv4or6 = AF_UNSPEC;
-
-/* 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;
-
-/* 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
- * on the command line.
- */
-int stdin_null_flag = 0;
-
-/*
- * 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
- * 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;
-
-/*
- * 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;
-
-/*
- * 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;
-
-/* Original real UID. */
-uid_t original_real_uid;
-
-/* command to be executed */
-Buffer command;
-
-/* Prints a help message to the user. This function never returns. */
-
-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 Enable authentication agent forwarding.\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 Enable X11 connection forwarding.\n");
- fprintf(stderr, " -x Disable X11 connection forwarding.\n");
- fprintf(stderr, " -X Enable 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);
-}
-
-/*
- * 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;
-
- log("Using rsh. WARNING: Connection will not be encrypted.");
- /* Build argument list for rsh. */
- i = 0;
-#ifndef _PATH_RSH
-#define _PATH_RSH "/usr/bin/rsh"
-#endif
- 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);
- exit(1);
-}
-
-int ssh_session(void);
-int ssh_session2(void);
-
-/*
- * 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];
- struct stat st;
- struct passwd *pw, pwcopy;
- int dummy;
- uid_t original_effective_uid;
-
- /*
- * 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();
-
- /* 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
- * 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).
- */
- temporarily_use_uid(original_real_uid);
-
- /*
- * 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);
-
- /* 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;
- }
- switch (opt) {
- 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':
- 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.krb4_tgt_passing = 0;
- options.krb5_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 't':
- tty_flag = 1;
- break;
- case 'v':
- 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());
- 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;
- else if (strlen(optarg) == 1)
- options.escape_char = (unsigned char) optarg[0];
- else if (strcmp(optarg, "none") == 0)
- options.escape_char = -2;
- 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);
- }
- }
- break;
- case 'p':
- options.port = atoi(optarg);
- break;
- case 'l':
- options.user = optarg;
- 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 */
- }
- 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 */
- }
- add_local_forward(&options, fwd_port, buf, fwd_host_port);
- 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;
- default:
- usage();
- }
- }
-
- /* Check that we got a host name. */
- if (!host)
- usage();
-
- SSLeay_add_all_algorithms();
-
- /* 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 (optind == ac) {
- /* No command specified - execute shell on a tty. */
- tty_flag = 1;
- } else {
- /* A command has been specified. Store it into the
- buffer. */
- for (i = optind; i < ac; i++) {
- if (i > optind)
- 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)
- 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;
-
- /* Do not allocate a tty if stdin is not a tty. */
- if (!isatty(fileno(stdin))) {
- if (tty_flag)
- fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n");
- 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);
- }
- /* 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);
- pwcopy.pw_class = xstrdup(pw->pw_class);
- pwcopy.pw_expire = pw->pw_expire;
- pwcopy.pw_change = pw->pw_change;
- 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);
-
- /* reinit */
- log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0);
-
- /* 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);
- }
-
- 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);
- }
- }
- /* 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);
-
- /* Execute rsh. */
- rsh_connect(host, options.user, &command);
- fatal("rsh_connect returned");
- }
- /* 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);
-
- /*
- * 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 (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;
- }
- /*
- * 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.
- */
-
- /*
- * 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);
-
- /*
- * 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);
- if (stat(buf, &st) < 0)
- if (mkdir(buf, 0755) < 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" : "");
-
- 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);
-
- /* 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 */
-
- exit_status = compat20 ? ssh_session2() : ssh_session();
- packet_close();
- return exit_status;
-}
-
-void
-x11_get_proto(char *proto, int proto_len, char *data, int data_len)
-{
- char line[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 */
- /*
- * 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;
-
- strlcpy(proto, "MIT-MAGIC-COOKIE-1", proto_len);
- 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;
- }
- }
-}
-
-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. */
- 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(&plen);
- 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_string(cp, strlen(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));
-
- /* Send the packet, and wait for it to leave. */
- packet_send();
- packet_write_wait();
-
- /* Read response from the server. */
- type = packet_read(&plen);
- 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[512], data[512];
- /* Get reasonable local authentication information. */
- x11_get_proto(proto, sizeof proto, data, sizeof 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);
- 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, 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);
-
- /* Request authentication agent forwarding if appropriate. */
- 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);
- 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);
- }
-
- /* 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);
- }
-
- /* 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, 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 : -1);
-}
-
-void
-init_local_fwd(void)
-{
- 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);
-
-void
-client_init(int id, void *arg)
-{
- int len;
- debug("client_init id %d arg %d", id, (int)arg);
-
- if (no_shell_flag)
- goto done;
-
- 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);
- 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];
- /* Get reasonable local authentication information. */
- x11_get_proto(proto, sizeof proto, data, sizeof data);
- /* Request forwarding with authentication spoofing. */
- debug("Requesting X11 forwarding with authentication spoofing.");
- x11_request_forwarding_with_spoofing(id, proto, data);
- /* 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);
- packet_send();
- } else {
- channel_request(id, "shell", 0);
- }
- /* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */
-done:
- /* register different callback, etc. XXX */
- client_set_session_ident(id);
-}
-
-int
-ssh_session2(void)
-{
- int window, packetmax, id;
- int in = dup(STDIN_FILENO);
- int out = dup(STDOUT_FILENO);
- int err = dup(STDERR_FILENO);
-
- if (in < 0 || out < 0 || err < 0)
- fatal("dump in/out/err failed");
-
- /* should be pre-session */
- init_local_fwd();
-
- window = 32*1024;
- if (tty_flag) {
- packetmax = window/8;
- } else {
- window *= 2;
- packetmax = window/2;
- }
-
- id = channel_new(
- "session", SSH_CHANNEL_OPENING, in, out, err,
- window, packetmax, CHAN_EXTENDED_WRITE, xstrdup("client-session"));
-
-
- channel_open(id);
- channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, client_init, (void *)0);
-
- return client_loop(tty_flag, tty_flag ? options.escape_char : -1);
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-17 00:14:06 +0000