version 1.51, 2000/05/08 17:12:15 |
version 1.51.2.4, 2001/03/12 15:44:16 |
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* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Author: Tatu Ylonen <ylo@cs.hut.fi> |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland |
* All rights reserved |
* All rights reserved |
* Created: Sat Mar 18 16:36:11 1995 ylo |
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* Ssh client program. This program can be used to log into a remote machine. |
* Ssh client program. This program can be used to log into a remote machine. |
* The software supports strong authentication, encryption, and forwarding |
* The software supports strong authentication, encryption, and forwarding |
* of X11, TCP/IP, and authentication connections. |
* 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 |
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* can be used freely for any purpose. Any derived versions of this |
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* software must be clearly marked as such, and if the derived work is |
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* incompatible with the protocol description in the RFC file, it must be |
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* called by a name other than "ssh" or "Secure Shell". |
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* |
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* Copyright (c) 1999 Niels Provos. All rights reserved. |
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* |
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* Modified to work with SSL by Niels Provos <provos@citi.umich.edu> |
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* in Canada (German citizen). |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
*/ |
*/ |
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#include "includes.h" |
#include "includes.h" |
RCSID("$Id$"); |
RCSID("$OpenBSD$"); |
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#include <openssl/evp.h> |
#include <openssl/evp.h> |
#include <openssl/dsa.h> |
#include <openssl/err.h> |
#include <openssl/rsa.h> |
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#include "xmalloc.h" |
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#include "ssh.h" |
#include "ssh.h" |
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#include "ssh1.h" |
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#include "ssh2.h" |
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#include "compat.h" |
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#include "cipher.h" |
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#include "xmalloc.h" |
#include "packet.h" |
#include "packet.h" |
#include "buffer.h" |
#include "buffer.h" |
#include "authfd.h" |
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#include "readconf.h" |
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#include "uidswap.h" |
#include "uidswap.h" |
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#include "ssh2.h" |
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#include "compat.h" |
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#include "channels.h" |
#include "channels.h" |
#include "key.h" |
#include "key.h" |
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#include "authfd.h" |
#include "authfile.h" |
#include "authfile.h" |
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#include "pathnames.h" |
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#include "clientloop.h" |
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#include "log.h" |
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#include "readconf.h" |
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#include "sshconnect.h" |
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#include "tildexpand.h" |
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#include "dispatch.h" |
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#include "misc.h" |
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#include "kex.h" |
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#include "mac.h" |
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extern char *__progname; |
extern char *__progname; |
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/* Flag indicating whether a tty should be allocated */ |
/* Flag indicating whether a tty should be allocated */ |
int tty_flag = 0; |
int tty_flag = 0; |
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int no_tty_flag = 0; |
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int force_tty_flag = 0; |
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/* don't exec a shell */ |
/* don't exec a shell */ |
int no_shell_flag = 0; |
int no_shell_flag = 0; |
int no_tty_flag = 0; |
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/* |
/* |
* Flag indicating that nothing should be read from stdin. This can be set |
* Flag indicating that nothing should be read from stdin. This can be set |
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*/ |
*/ |
volatile int received_window_change_signal = 0; |
volatile int received_window_change_signal = 0; |
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/* Value of argv[0] (set in the main program). */ |
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char *av0; |
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/* Flag indicating whether we have a valid host private key loaded. */ |
/* Flag indicating whether we have a valid host private key loaded. */ |
int host_private_key_loaded = 0; |
int host_private_key_loaded = 0; |
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/* command to be executed */ |
/* command to be executed */ |
Buffer command; |
Buffer command; |
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/* Should we execute a command or invoke a subsystem? */ |
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int subsystem_flag = 0; |
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/* Prints a help message to the user. This function never returns. */ |
/* Prints a help message to the user. This function never returns. */ |
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void |
void |
usage() |
usage(void) |
{ |
{ |
fprintf(stderr, "Usage: %s [options] host [command]\n", av0); |
fprintf(stderr, "Usage: %s [options] host [command]\n", __progname); |
fprintf(stderr, "Options:\n"); |
fprintf(stderr, "Options:\n"); |
fprintf(stderr, " -l user Log in using this user name.\n"); |
fprintf(stderr, " -l user Log in using this user name.\n"); |
fprintf(stderr, " -n Redirect input from /dev/null.\n"); |
fprintf(stderr, " -n Redirect input from " _PATH_DEVNULL ".\n"); |
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fprintf(stderr, " -A Enable authentication agent forwarding.\n"); |
fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
fprintf(stderr, " -a Disable authentication agent forwarding.\n"); |
#ifdef AFS |
#ifdef AFS |
fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
fprintf(stderr, " -k Disable Kerberos ticket and AFS token forwarding.\n"); |
#endif /* AFS */ |
#endif /* AFS */ |
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fprintf(stderr, " -X Enable X11 connection forwarding.\n"); |
fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
fprintf(stderr, " -x Disable X11 connection forwarding.\n"); |
fprintf(stderr, " -i file Identity for RSA authentication (default: ~/.ssh/identity).\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 Tty; allocate a tty even if command is given.\n"); |
fprintf(stderr, " -T Do not allocate a tty.\n"); |
fprintf(stderr, " -T Do not allocate a tty.\n"); |
fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
fprintf(stderr, " -v Verbose; display verbose debugging messages.\n"); |
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fprintf(stderr, " Multiple -v increases verbosity.\n"); |
fprintf(stderr, " -V Display version number only.\n"); |
fprintf(stderr, " -V Display version number only.\n"); |
fprintf(stderr, " -P Don't allocate a privileged port.\n"); |
fprintf(stderr, " -P Don't allocate a privileged port.\n"); |
fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
fprintf(stderr, " -q Quiet; don't display any warning messages.\n"); |
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fprintf(stderr, " -p port Connect to this port. Server must be on the same port.\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, " -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, " -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, " 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, " forward them to the other side by connecting to host:port.\n"); |
fprintf(stderr, " -C Enable compression.\n"); |
fprintf(stderr, " -C Enable compression.\n"); |
fprintf(stderr, " -N Do not execute a shell or command.\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, " -g Allow remote hosts to connect to forwarded ports.\n"); |
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fprintf(stderr, " -1 Force protocol version 1.\n"); |
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fprintf(stderr, " -2 Force protocol version 2.\n"); |
fprintf(stderr, " -4 Use IPv4 only.\n"); |
fprintf(stderr, " -4 Use IPv4 only.\n"); |
fprintf(stderr, " -6 Use IPv6 only.\n"); |
fprintf(stderr, " -6 Use IPv6 only.\n"); |
fprintf(stderr, " -2 Force protocol version 2.\n"); |
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fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
fprintf(stderr, " -o 'option' Process the option as if it was read from a configuration file.\n"); |
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fprintf(stderr, " -s Invoke command (mandatory) as SSH2 subsystem.\n"); |
exit(1); |
exit(1); |
} |
} |
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exit(1); |
exit(1); |
} |
} |
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int ssh_session(void); |
int ssh_session(void); |
int ssh_session2(void); |
int ssh_session2(void); |
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int guess_identity_file_type(const char *filename); |
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/* |
/* |
* Main program for the ssh client. |
* Main program for the ssh client. |
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*/ |
*/ |
umask(022); |
umask(022); |
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/* Save our own name. */ |
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av0 = av[0]; |
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/* Initialize option structure to indicate that no values have been set. */ |
/* Initialize option structure to indicate that no values have been set. */ |
initialize_options(&options); |
initialize_options(&options); |
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/* Parse command-line arguments. */ |
/* Parse command-line arguments. */ |
host = NULL; |
host = NULL; |
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/* If program name is not one of the standard names, use it as host name. */ |
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if (strchr(av0, '/')) |
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cp = strrchr(av0, '/') + 1; |
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else |
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cp = av0; |
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if (strcmp(cp, "rsh") != 0 && strcmp(cp, "ssh") != 0 && |
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strcmp(cp, "rlogin") != 0 && strcmp(cp, "slogin") != 0) |
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host = cp; |
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for (optind = 1; optind < ac; optind++) { |
for (optind = 1; optind < ac; optind++) { |
if (av[optind][0] != '-') { |
if (av[optind][0] != '-') { |
if (host) |
if (host) |
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opt = av[optind][1]; |
opt = av[optind][1]; |
if (!opt) |
if (!opt) |
usage(); |
usage(); |
if (strchr("eilcpLRo", opt)) { /* options with arguments */ |
if (strchr("eilcmpLRo", opt)) { /* options with arguments */ |
optarg = av[optind] + 2; |
optarg = av[optind] + 2; |
if (strcmp(optarg, "") == 0) { |
if (strcmp(optarg, "") == 0) { |
if (optind >= ac - 1) |
if (optind >= ac - 1) |
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optarg = NULL; |
optarg = NULL; |
} |
} |
switch (opt) { |
switch (opt) { |
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case '1': |
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options.protocol = SSH_PROTO_1; |
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break; |
case '2': |
case '2': |
options.protocol = SSH_PROTO_2; |
options.protocol = SSH_PROTO_2; |
break; |
break; |
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case 'a': |
case 'a': |
options.forward_agent = 0; |
options.forward_agent = 0; |
break; |
break; |
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case 'A': |
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options.forward_agent = 1; |
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break; |
#ifdef AFS |
#ifdef AFS |
case 'k': |
case 'k': |
options.kerberos_tgt_passing = 0; |
options.kerberos_tgt_passing = 0; |
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case 'i': |
case 'i': |
if (stat(optarg, &st) < 0) { |
if (stat(optarg, &st) < 0) { |
fprintf(stderr, "Warning: Identity file %s does not exist.\n", |
fprintf(stderr, "Warning: Identity file %s does not exist.\n", |
optarg); |
optarg); |
break; |
break; |
} |
} |
if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) |
if (options.num_identity_files >= SSH_MAX_IDENTITY_FILES) |
fatal("Too many identity files specified (max %d)", |
fatal("Too many identity files specified (max %d)", |
SSH_MAX_IDENTITY_FILES); |
SSH_MAX_IDENTITY_FILES); |
options.identity_files[options.num_identity_files++] = |
options.identity_files[options.num_identity_files++] = xstrdup(optarg); |
xstrdup(optarg); |
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break; |
break; |
case 't': |
case 't': |
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if (tty_flag) |
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force_tty_flag = 1; |
tty_flag = 1; |
tty_flag = 1; |
break; |
break; |
case 'v': |
case 'v': |
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if (0 == debug_flag) { |
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debug_flag = 1; |
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options.log_level = SYSLOG_LEVEL_DEBUG1; |
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} else if (options.log_level < SYSLOG_LEVEL_DEBUG3) { |
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options.log_level++; |
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break; |
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} else { |
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fatal("Too high debugging level.\n"); |
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} |
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/* fallthrough */ |
case 'V': |
case 'V': |
fprintf(stderr, "SSH Version %s, protocol versions %d.%d/%d.%d.\n", |
fprintf(stderr, |
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"%s, SSH protocols %d.%d/%d.%d, OpenSSL 0x%8.8lx\n", |
SSH_VERSION, |
SSH_VERSION, |
PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, |
PROTOCOL_MAJOR_1, PROTOCOL_MINOR_1, |
PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2); |
PROTOCOL_MAJOR_2, PROTOCOL_MINOR_2, |
fprintf(stderr, "Compiled with SSL (0x%8.8lx).\n", SSLeay()); |
SSLeay()); |
if (opt == 'V') |
if (opt == 'V') |
exit(0); |
exit(0); |
debug_flag = 1; |
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options.log_level = SYSLOG_LEVEL_DEBUG; |
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break; |
break; |
case 'q': |
case 'q': |
options.log_level = SYSLOG_LEVEL_QUIET; |
options.log_level = SYSLOG_LEVEL_QUIET; |
break; |
break; |
case 'e': |
case 'e': |
if (optarg[0] == '^' && optarg[2] == 0 && |
if (optarg[0] == '^' && optarg[2] == 0 && |
(unsigned char) optarg[1] >= 64 && (unsigned char) optarg[1] < 128) |
(u_char) optarg[1] >= 64 && (u_char) optarg[1] < 128) |
options.escape_char = (unsigned char) optarg[1] & 31; |
options.escape_char = (u_char) optarg[1] & 31; |
else if (strlen(optarg) == 1) |
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) |
else if (strcmp(optarg, "none") == 0) |
options.escape_char = -2; |
options.escape_char = -2; |
else { |
else { |
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fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
fprintf(stderr, "Unknown cipher type '%s'\n", optarg); |
exit(1); |
exit(1); |
} |
} |
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if (options.cipher == SSH_CIPHER_3DES) { |
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options.ciphers = "3des-cbc"; |
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} else if (options.cipher == SSH_CIPHER_BLOWFISH) { |
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options.ciphers = "blowfish-cbc"; |
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} else { |
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options.ciphers = (char *)-1; |
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} |
} |
} |
break; |
break; |
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case 'm': |
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if (mac_valid(optarg)) |
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options.macs = xstrdup(optarg); |
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else { |
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fprintf(stderr, "Unknown mac type '%s'\n", optarg); |
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exit(1); |
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} |
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break; |
case 'p': |
case 'p': |
options.port = atoi(optarg); |
options.port = atoi(optarg); |
break; |
break; |
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"command-line", 0, &dummy) != 0) |
"command-line", 0, &dummy) != 0) |
exit(1); |
exit(1); |
break; |
break; |
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case 's': |
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subsystem_flag = 1; |
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break; |
default: |
default: |
usage(); |
usage(); |
} |
} |
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if (!host) |
if (!host) |
usage(); |
usage(); |
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OpenSSL_add_all_algorithms(); |
SSLeay_add_all_algorithms(); |
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ERR_load_crypto_strings(); |
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/* Initialize the command to execute on remote host. */ |
/* Initialize the command to execute on remote host. */ |
buffer_init(&command); |
buffer_init(&command); |
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if (optind == ac) { |
if (optind == ac) { |
/* No command specified - execute shell on a tty. */ |
/* No command specified - execute shell on a tty. */ |
tty_flag = 1; |
tty_flag = 1; |
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if (subsystem_flag) { |
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fprintf(stderr, "You must specify a subsystem to invoke."); |
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usage(); |
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} |
} else { |
} else { |
/* A command has been specified. Store it into the |
/* A command has been specified. Store it into the |
buffer. */ |
buffer. */ |
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} |
} |
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/* Cannot fork to background if no command. */ |
/* 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."); |
fatal("Cannot fork into background without a command to execute."); |
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/* Allocate a tty by default if no command specified. */ |
/* Allocate a tty by default if no command specified. */ |
if (buffer_len(&command) == 0) |
if (buffer_len(&command) == 0) |
tty_flag = 1; |
tty_flag = 1; |
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/* Force no tty*/ |
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if (no_tty_flag) |
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tty_flag = 0; |
/* Do not allocate a tty if stdin is not a tty. */ |
/* Do not allocate a tty if stdin is not a tty. */ |
if (!isatty(fileno(stdin))) { |
if (!isatty(fileno(stdin)) && !force_tty_flag) { |
if (tty_flag) |
if (tty_flag) |
fprintf(stderr, "Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); |
log("Pseudo-terminal will not be allocated because stdin is not a terminal.\n"); |
tty_flag = 0; |
tty_flag = 0; |
} |
} |
/* force */ |
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if (no_tty_flag) |
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tty_flag = 0; |
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/* Get user data. */ |
/* Get user data. */ |
pw = getpwuid(original_real_uid); |
pw = getpwuid(original_real_uid); |
if (!pw) { |
if (!pw) { |
fprintf(stderr, "You don't exist, go away!\n"); |
log("You don't exist, go away!\n"); |
exit(1); |
exit(1); |
} |
} |
/* Take a copy of the returned structure. */ |
/* Take a copy of the returned structure. */ |
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pwcopy.pw_passwd = xstrdup(pw->pw_passwd); |
pwcopy.pw_passwd = xstrdup(pw->pw_passwd); |
pwcopy.pw_uid = pw->pw_uid; |
pwcopy.pw_uid = pw->pw_uid; |
pwcopy.pw_gid = pw->pw_gid; |
pwcopy.pw_gid = pw->pw_gid; |
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pwcopy.pw_class = xstrdup(pw->pw_class); |
pwcopy.pw_dir = xstrdup(pw->pw_dir); |
pwcopy.pw_dir = xstrdup(pw->pw_dir); |
pwcopy.pw_shell = xstrdup(pw->pw_shell); |
pwcopy.pw_shell = xstrdup(pw->pw_shell); |
pw = &pwcopy; |
pw = &pwcopy; |
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log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); |
log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); |
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/* Read per-user configuration file. */ |
/* Read per-user configuration file. */ |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_CONFFILE); |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_CONFFILE); |
read_config_file(buf, host, &options); |
read_config_file(buf, host, &options); |
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/* Read systemwide configuration file. */ |
/* Read systemwide configuration file. */ |
read_config_file(HOST_CONFIG_FILE, host, &options); |
read_config_file(_PATH_HOST_CONFIG_FILE, host, &options); |
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/* Fill configuration defaults. */ |
/* Fill configuration defaults. */ |
fill_default_options(&options); |
fill_default_options(&options); |
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/* reinit */ |
/* reinit */ |
log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); |
log_init(av[0], options.log_level, SYSLOG_FACILITY_USER, 0); |
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/* check if RSA support exists */ |
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if ((options.protocol & SSH_PROTO_1) && |
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rsa_alive() == 0) { |
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log("%s: no RSA support in libssl and libcrypto. See ssl(8).", |
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__progname); |
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log("Disabling protocol version 1"); |
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options.protocol &= ~ (SSH_PROTO_1|SSH_PROTO_1_PREFERRED); |
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} |
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if (! options.protocol & (SSH_PROTO_1|SSH_PROTO_2)) { |
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fprintf(stderr, "%s: No protocol version available.\n", |
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__progname); |
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exit(1); |
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} |
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if (options.user == NULL) |
if (options.user == NULL) |
options.user = xstrdup(pw->pw_name); |
options.user = xstrdup(pw->pw_name); |
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if (options.hostname != NULL) |
if (options.hostname != NULL) |
host = options.hostname; |
host = options.hostname; |
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/* Find canonic host name. */ |
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if (strchr(host, '.') == 0) { |
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struct addrinfo hints; |
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struct addrinfo *ai = NULL; |
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int errgai; |
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memset(&hints, 0, sizeof(hints)); |
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hints.ai_family = IPv4or6; |
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hints.ai_flags = AI_CANONNAME; |
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hints.ai_socktype = SOCK_STREAM; |
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errgai = getaddrinfo(host, NULL, &hints, &ai); |
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if (errgai == 0) { |
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if (ai->ai_canonname != NULL) |
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host = xstrdup(ai->ai_canonname); |
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freeaddrinfo(ai); |
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} |
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} |
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/* Disable rhosts authentication if not running as root. */ |
/* Disable rhosts authentication if not running as root. */ |
if (original_effective_uid != 0 || !options.use_privileged_port) { |
if (original_effective_uid != 0 || !options.use_privileged_port) { |
|
debug("Rhosts Authentication disabled, " |
|
"originating port will not be trusted."); |
options.rhosts_authentication = 0; |
options.rhosts_authentication = 0; |
options.rhosts_rsa_authentication = 0; |
|
} |
} |
/* |
/* |
* If using rsh has been selected, exec it now (without trying |
* If using rsh has been selected, exec it now (without trying |
|
|
/* Restore our superuser privileges. */ |
/* Restore our superuser privileges. */ |
restore_uid(); |
restore_uid(); |
|
|
/* |
/* Open a connection to the remote host. */ |
* Open a connection to the remote host. This needs root privileges |
|
* if rhosts_{rsa_}authentication is enabled. |
|
*/ |
|
|
|
ok = ssh_connect(host, &hostaddr, options.port, |
ok = ssh_connect(host, &hostaddr, options.port, |
options.connection_attempts, |
options.connection_attempts, |
!options.rhosts_authentication && |
original_effective_uid != 0 || !options.use_privileged_port, |
!options.rhosts_rsa_authentication, |
original_real_uid, |
original_real_uid, |
options.proxy_command); |
options.proxy_command); |
|
|
|
/* |
/* |
* If we successfully made the connection, load the host private key |
* If we successfully made the connection, load the host private key |
|
|
if (ok && (options.protocol & SSH_PROTO_1)) { |
if (ok && (options.protocol & SSH_PROTO_1)) { |
Key k; |
Key k; |
host_private_key = RSA_new(); |
host_private_key = RSA_new(); |
k.type = KEY_RSA; |
k.type = KEY_RSA1; |
k.rsa = host_private_key; |
k.rsa = host_private_key; |
if (load_private_key(HOST_KEY_FILE, "", &k, NULL)) |
if (load_private_key(_PATH_HOST_KEY_FILE, "", &k, NULL)) |
host_private_key_loaded = 1; |
host_private_key_loaded = 1; |
} |
} |
/* |
/* |
|
|
* Now that we are back to our own permissions, create ~/.ssh |
* Now that we are back to our own permissions, create ~/.ssh |
* directory if it doesn\'t already exist. |
* directory if it doesn\'t already exist. |
*/ |
*/ |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, SSH_USER_DIR); |
snprintf(buf, sizeof buf, "%.100s/%.100s", pw->pw_dir, _PATH_SSH_USER_DIR); |
if (stat(buf, &st) < 0) |
if (stat(buf, &st) < 0) |
if (mkdir(buf, 0755) < 0) |
if (mkdir(buf, 0700) < 0) |
error("Could not create directory '%.200s'.", buf); |
error("Could not create directory '%.200s'.", buf); |
|
|
/* Check if the connection failed, and try "rsh" if appropriate. */ |
/* Check if the connection failed, and try "rsh" if appropriate. */ |
|
|
} |
} |
exit(1); |
exit(1); |
} |
} |
/* Expand ~ in options.identity_files. */ |
/* Expand ~ in options.identity_files, known host file names. */ |
/* XXX mem-leaks */ |
/* XXX mem-leaks */ |
for (i = 0; i < options.num_identity_files; i++) |
for (i = 0; i < options.num_identity_files; i++) { |
options.identity_files[i] = |
options.identity_files[i] = |
tilde_expand_filename(options.identity_files[i], original_real_uid); |
tilde_expand_filename(options.identity_files[i], original_real_uid); |
for (i = 0; i < options.num_identity_files2; i++) |
options.identity_files_type[i] = guess_identity_file_type(options.identity_files[i]); |
options.identity_files2[i] = |
debug("identity file %s type %d", options.identity_files[i], |
tilde_expand_filename(options.identity_files2[i], original_real_uid); |
options.identity_files_type[i]); |
/* Expand ~ in known host file names. */ |
} |
options.system_hostfile = tilde_expand_filename(options.system_hostfile, |
options.system_hostfile = |
original_real_uid); |
tilde_expand_filename(options.system_hostfile, original_real_uid); |
options.user_hostfile = tilde_expand_filename(options.user_hostfile, |
options.user_hostfile = |
original_real_uid); |
tilde_expand_filename(options.user_hostfile, original_real_uid); |
options.system_hostfile2 = tilde_expand_filename(options.system_hostfile2, |
options.system_hostfile2 = |
original_real_uid); |
tilde_expand_filename(options.system_hostfile2, original_real_uid); |
options.user_hostfile2 = tilde_expand_filename(options.user_hostfile2, |
options.user_hostfile2 = |
original_real_uid); |
tilde_expand_filename(options.user_hostfile2, original_real_uid); |
|
|
/* Log into the remote system. This never returns if the login fails. */ |
/* Log into the remote system. This never returns if the login fails. */ |
ssh_login(host_private_key_loaded, host_private_key, |
ssh_login(host_private_key_loaded, host_private_key, |
|
|
FILE *f; |
FILE *f; |
int got_data = 0, i; |
int got_data = 0, i; |
|
|
#ifdef XAUTH_PATH |
if (options.xauth_location) { |
/* Try to get Xauthority information for the display. */ |
/* Try to get Xauthority information for the display. */ |
snprintf(line, sizeof line, "%.100s list %.200s 2>/dev/null", |
snprintf(line, sizeof line, "%.100s list %.200s 2>" _PATH_DEVNULL, |
XAUTH_PATH, getenv("DISPLAY")); |
options.xauth_location, getenv("DISPLAY")); |
f = popen(line, "r"); |
f = popen(line, "r"); |
if (f && fgets(line, sizeof(line), f) && |
if (f && fgets(line, sizeof(line), f) && |
sscanf(line, "%*s %s %s", proto, data) == 2) |
sscanf(line, "%*s %s %s", proto, data) == 2) |
got_data = 1; |
got_data = 1; |
if (f) |
if (f) |
pclose(f); |
pclose(f); |
#endif /* XAUTH_PATH */ |
} |
/* |
/* |
* If we didn't get authentication data, just make up some |
* If we didn't get authentication data, just make up some |
* data. The forwarding code will check the validity of the |
* data. The forwarding code will check the validity of the |
|
|
} |
} |
} |
} |
|
|
|
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_request_local_forwarding( |
|
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); |
|
} |
|
} |
|
|
|
void |
|
check_agent_present(void) |
|
{ |
|
if (options.forward_agent) { |
|
/* Clear agent forwarding if we don\'t have an agent. */ |
|
int authfd = ssh_get_authentication_socket(); |
|
if (authfd < 0) |
|
options.forward_agent = 0; |
|
else |
|
ssh_close_authentication_socket(authfd); |
|
} |
|
} |
|
|
int |
int |
ssh_session(void) |
ssh_session(void) |
{ |
{ |
int type; |
int type; |
int i; |
|
int plen; |
int plen; |
int interactive = 0; |
int interactive = 0; |
int have_tty = 0; |
int have_tty = 0; |
struct winsize ws; |
struct winsize ws; |
int authfd; |
|
char *cp; |
char *cp; |
|
|
/* Enable compression if requested. */ |
/* Enable compression if requested. */ |
|
|
} |
} |
} |
} |
/* Tell the packet module whether this is an interactive session. */ |
/* Tell the packet module whether this is an interactive session. */ |
packet_set_interactive(interactive, options.keepalives); |
packet_set_interactive(interactive); |
|
|
/* 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. */ |
/* Request authentication agent forwarding if appropriate. */ |
|
check_agent_present(); |
|
|
if (options.forward_agent) { |
if (options.forward_agent) { |
debug("Requesting authentication agent forwarding."); |
debug("Requesting authentication agent forwarding."); |
auth_request_forwarding(); |
auth_request_forwarding(); |
|
|
if (type != SSH_SMSG_SUCCESS) |
if (type != SSH_SMSG_SUCCESS) |
log("Warning: Remote host denied authentication agent forwarding."); |
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. */ |
/* Initiate port forwardings. */ |
for (i = 0; i < options.num_remote_forwards; i++) { |
ssh_init_forwarding(); |
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 requested, let ssh continue in the background. */ |
if (fork_after_authentication_flag) |
if (fork_after_authentication_flag) |
|
|
} |
} |
|
|
/* Enter the interactive session. */ |
/* 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 : -1, 0); |
} |
} |
|
|
void |
void |
init_local_fwd(void) |
client_subsystem_reply(int type, int plen, void *ctxt) |
{ |
{ |
int i; |
int id, len; |
/* Initiate local TCP/IP port forwardings. */ |
|
for (i = 0; i < options.num_local_forwards; i++) { |
id = packet_get_int(); |
debug("Connections to local port %d forwarded to remote address %.200s:%d", |
len = buffer_len(&command); |
options.local_forwards[i].port, |
len = MAX(len, 900); |
options.local_forwards[i].host, |
packet_done(); |
options.local_forwards[i].host_port); |
if (type == SSH2_MSG_CHANNEL_FAILURE) |
channel_request_local_forwarding(options.local_forwards[i].port, |
fatal("Request for subsystem '%.*s' failed on channel %d", |
options.local_forwards[i].host, |
len, buffer_ptr(&command), id); |
options.local_forwards[i].host_port, |
|
options.gateway_ports); |
|
} |
|
} |
} |
|
|
extern void client_set_session_ident(int id); |
|
|
|
void |
void |
client_init(int id, void *arg) |
ssh_session2_callback(int id, void *arg) |
{ |
{ |
int len; |
int len; |
debug("client_init id %d arg %d", id, (int)arg); |
int interactive = 0; |
|
|
|
debug("client_init id %d arg %ld", id, (long)arg); |
|
|
if (no_shell_flag) |
if (no_shell_flag) |
goto done; |
goto done; |
|
|
|
|
packet_put_int(ws.ws_ypixel); |
packet_put_int(ws.ws_ypixel); |
packet_put_cstring(""); /* XXX: encode terminal modes */ |
packet_put_cstring(""); /* XXX: encode terminal modes */ |
packet_send(); |
packet_send(); |
|
interactive = 1; |
/* XXX wait for reply */ |
/* XXX wait for reply */ |
} |
} |
if (options.forward_x11 && |
if (options.forward_x11 && |
|
|
/* Request forwarding with authentication spoofing. */ |
/* Request forwarding with authentication spoofing. */ |
debug("Requesting X11 forwarding with authentication spoofing."); |
debug("Requesting X11 forwarding with authentication spoofing."); |
x11_request_forwarding_with_spoofing(id, proto, data); |
x11_request_forwarding_with_spoofing(id, proto, data); |
|
interactive = 1; |
/* XXX wait for reply */ |
/* 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); |
len = buffer_len(&command); |
if (len > 0) { |
if (len > 0) { |
if (len > 900) |
if (len > 900) |
len = 900; |
len = 900; |
debug("Sending command: %.*s", len, buffer_ptr(&command)); |
if (subsystem_flag) { |
channel_request_start(id, "exec", 0); |
debug("Sending subsystem: %.*s", len, buffer_ptr(&command)); |
|
channel_request_start(id, "subsystem", /*want reply*/ 1); |
|
/* register callback for reply */ |
|
/* XXX we asume 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, buffer_ptr(&command)); |
|
channel_request_start(id, "exec", 0); |
|
} |
packet_put_string(buffer_ptr(&command), len); |
packet_put_string(buffer_ptr(&command), len); |
packet_send(); |
packet_send(); |
} else { |
} else { |
channel_request(id, "shell", 0); |
channel_request(id, "shell", 0); |
} |
} |
/* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ |
/* channel_callback(id, SSH2_MSG_OPEN_CONFIGMATION, client_init, 0); */ |
|
|
done: |
done: |
/* register different callback, etc. XXX */ |
/* register different callback, etc. XXX */ |
client_set_session_ident(id); |
packet_set_interactive(interactive); |
} |
} |
|
|
int |
int |
ssh_session2(void) |
ssh_session2(void) |
{ |
{ |
int window, packetmax, id; |
int window, packetmax, id; |
int in = dup(STDIN_FILENO); |
int in, out, err; |
int out = dup(STDOUT_FILENO); |
|
int err = dup(STDERR_FILENO); |
|
|
|
|
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) |
if (in < 0 || out < 0 || err < 0) |
fatal("dump in/out/err failed"); |
fatal("dup() in/out/err failed"); |
|
|
/* should be pre-session */ |
/* enable nonblocking unless tty */ |
init_local_fwd(); |
if (!isatty(in)) |
|
set_nonblock(in); |
window = 32*1024; |
if (!isatty(out)) |
if (tty_flag) { |
set_nonblock(out); |
packetmax = window/8; |
if (!isatty(err)) |
} else { |
set_nonblock(err); |
|
|
|
/* XXX should be pre-session */ |
|
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)); |
|
|
|
window = CHAN_SES_WINDOW_DEFAULT; |
|
packetmax = CHAN_SES_PACKET_DEFAULT; |
|
if (!tty_flag) { |
window *= 2; |
window *= 2; |
packetmax = window/2; |
packetmax *=2; |
} |
} |
|
|
id = channel_new( |
id = channel_new( |
"session", SSH_CHANNEL_OPENING, in, out, err, |
"session", SSH_CHANNEL_OPENING, in, out, err, |
window, packetmax, CHAN_EXTENDED_WRITE, xstrdup("client-session")); |
window, packetmax, CHAN_EXTENDED_WRITE, |
|
xstrdup("client-session"), /*nonblock*/0); |
|
|
|
|
channel_open(id); |
channel_open(id); |
channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, client_init, (void *)0); |
channel_register_callback(id, SSH2_MSG_CHANNEL_OPEN_CONFIRMATION, |
|
ssh_session2_callback, (void *)0); |
|
|
return client_loop(tty_flag, tty_flag ? options.escape_char : -1); |
return client_loop(tty_flag, tty_flag ? options.escape_char : -1, id); |
|
} |
|
|
|
int |
|
guess_identity_file_type(const char *filename) |
|
{ |
|
struct stat st; |
|
Key *public; |
|
int type = KEY_RSA1; /* default */ |
|
|
|
if (stat(filename, &st) < 0) { |
|
/* ignore this key */ |
|
return KEY_UNSPEC; |
|
} |
|
public = key_new(type); |
|
if (!load_public_key(filename, public, NULL)) { |
|
/* ok, so we will assume this is 'some' key */ |
|
type = KEY_UNSPEC; |
|
} |
|
key_free(public); |
|
return type; |
} |
} |