lsh.c 5.58 KB
Newer Older
Niels Möller's avatar
Niels Möller committed
1 2 3
/* lsh.c
 *
 * client main program
4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
 *
 * $Id$ */

/* lsh, an implementation of the ssh protocol
 *
 * Copyright (C) 1998 Niels Mller
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
Niels Möller's avatar
Niels Möller committed
24 25
 */

Niels Möller's avatar
Niels Möller committed
26
#include <errno.h>
Niels Möller's avatar
Niels Möller committed
27
#include <locale.h>
Niels Möller's avatar
Niels Möller committed
28
#include <stdio.h>
29
#include <stdlib.h>
Niels Möller's avatar
Niels Möller committed
30
#include <string.h>
Niels Möller's avatar
Niels Möller committed
31

32 33
#include <unistd.h>

Niels Möller's avatar
Niels Möller committed
34
#include "getopt.h"
Niels Möller's avatar
Niels Möller committed
35

Niels Möller's avatar
Niels Möller committed
36 37
#include "alist.h"
#include "atoms.h"
38
#include "channel.h"
39
#include "charset.h"
Niels Möller's avatar
Niels Möller committed
40
#include "client.h"
Niels Möller's avatar
Niels Möller committed
41
#include "client_keyexchange.h"
Niels Möller's avatar
Niels Möller committed
42
#include "crypto.h"
Niels Möller's avatar
Niels Möller committed
43 44 45
#include "format.h"
#include "io.h"
#include "randomness.h"
Niels Möller's avatar
Niels Möller committed
46
#include "service.h"
47
/* #include "session.h" */
48
#include "ssh.h"
Niels Möller's avatar
Niels Möller committed
49
#include "userauth.h"
Niels Möller's avatar
Niels Möller committed
50
#include "werror.h"
Niels Möller's avatar
Niels Möller committed
51
#include "xalloc.h"
Niels Möller's avatar
Niels Möller committed
52

53 54
#include "lsh.c.x"

55
/* Block size for stdout and stderr buffers */
Niels Möller's avatar
Niels Möller committed
56 57
#define BLOCK_SIZE 32768

Niels Möller's avatar
Niels Möller committed
58
void usage(void) NORETURN;
Niels Möller's avatar
Niels Möller committed
59

Niels Möller's avatar
Niels Möller committed
60
void usage(void)
Niels Möller's avatar
Niels Möller committed
61 62 63 64
{
  exit(1);
}

65 66 67 68 69 70 71 72 73
/* CLASS:
   (class
     (name fake_host_db)
     (super lookup_verifier)
     (vars
       (algorithm object signature_algorithm)))
*/

#if 0
Niels Möller's avatar
Niels Möller committed
74 75 76 77 78 79
struct fake_host_db
{
  struct lookup_verifier super;

  struct signature_algorithm *algorithm;
};
80
#endif
Niels Möller's avatar
Niels Möller committed
81 82

static struct verifier *do_host_lookup(struct lookup_verifier *c,
Niels Möller's avatar
Niels Möller committed
83
				       struct lsh_string *key)
Niels Möller's avatar
Niels Möller committed
84
{
85
  CAST(fake_host_db, closure, c);
Niels Möller's avatar
Niels Möller committed
86

Niels Möller's avatar
Niels Möller committed
87 88 89 90 91
  return MAKE_VERIFIER(closure->algorithm, key->length, key->data);
}

static struct lookup_verifier *make_fake_host_db(struct signature_algorithm *a)
{
92
  NEW(fake_host_db, res);
Niels Möller's avatar
Niels Möller committed
93 94 95 96 97 98 99

  res->super.lookup = do_host_lookup;
  res->algorithm = a;

  return &res->super;
}

Niels Möller's avatar
Niels Möller committed
100 101 102
int main(int argc, char **argv)
{
  char *host = NULL;
103
  char *user = NULL;
Niels Möller's avatar
Niels Möller committed
104 105
  char *port = "ssh";
  int option;
Niels Möller's avatar
Niels Möller committed
106 107

  int lsh_exit_code;
108
  
Niels Möller's avatar
Niels Möller committed
109
  struct sockaddr_in remote;
Niels Möller's avatar
Niels Möller committed
110

111 112 113
  /* STATIC, because the object exists at gc time */
  struct io_backend backend = { STATIC_HEADER };

Niels Möller's avatar
Niels Möller committed
114 115 116 117 118 119 120 121
  struct lsh_string *random_seed;
  struct randomness *r;
  struct diffie_hellman_method *dh;
  struct keyexchange_algorithm *kex;
  struct alist *algorithms;
  struct make_kexinit *make_kexinit;
  struct packet_handler *kexinit_handler;
  struct lookup_verifier *lookup;
122
  struct ssh_service *service;
123 124

  int in, out, err;
125
  
Niels Möller's avatar
Niels Möller committed
126 127 128
  /* For filtering messages. Could perhaps also be used when converting
   * strings to and from UTF8. */
  setlocale(LC_CTYPE, "");
129 130
  /* FIXME: Choose character set depending on the locale */
  set_local_charset(CHARSET_LATIN1);
Niels Möller's avatar
Niels Möller committed
131
  
132
  while((option = getopt(argc, argv, "dl:p:qv")) != -1)
Niels Möller's avatar
Niels Möller committed
133 134 135 136 137
    switch(option)
      {
      case 'p':
	port = optarg;
	break;
138 139 140
      case 'l':
	user = optarg;
	break;
Niels Möller's avatar
Niels Möller committed
141 142 143 144 145 146
      case 'q':
	quiet_flag = 1;
	break;
      case 'd':
	debug_flag = 1;
	break;
Niels Möller's avatar
Niels Möller committed
147 148 149
      case 'v':
	verbose_flag = 1;
	break;
Niels Möller's avatar
Niels Möller committed
150 151 152 153 154 155 156 157
      default:
	usage();
      }

  if ( (argc - optind) < 1)
    usage();

  host = argv[optind];
158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
  if (!user)
      user = getenv("LOGNAME");

  if (!user)
    {
      werror("lsh: No user name.\n"
	     "Please use the -l option, or set LOGNAME in the environment\n");
      exit(EXIT_FAILURE);
    }

  if (!get_inaddr(&remote, host, port, "tcp"))
    {
      fprintf(stderr, "No such host or service\n");
      exit(1);
    }
Niels Möller's avatar
Niels Möller committed
173

174 175
  init_backend(&backend);
  
Niels Möller's avatar
Niels Möller committed
176 177 178 179 180 181 182
  random_seed = ssh_format("%z", "gazonk");
  r = make_poor_random(&sha_algorithm, random_seed);
  dh = make_dh1(r);
  /* No randomness is needed for verifying signatures */
  lookup = make_fake_host_db(make_dss_algorithm(NULL)); 
  kex = make_dh_client(dh, lookup);
  algorithms = make_alist(4,
183
			  ATOM_ARCFOUR, &crypto_rc4_algorithm,
Niels Möller's avatar
Niels Möller committed
184 185 186 187
			  ATOM_HMAC_SHA1, make_hmac_algorithm(&sha_algorithm),
			  ATOM_DIFFIE_HELLMAN_GROUP1_SHA1, kex,
			  ATOM_SSH_DSS, make_dss_algorithm(r), -1);
  make_kexinit = make_test_kexinit(r);
Niels Möller's avatar
Niels Möller committed
188

189 190 191
  /* Dup stdio file descriptors, so that they can be closed without
   * confusing the c library. */
  
Niels Möller's avatar
Niels Möller committed
192
  if ( (in = dup(STDIN_FILENO)) < 0)
193 194 195 196
    {
      werror("Can't dup stdin: %s\n", strerror(errno));
      return EXIT_FAILURE;
    }
Niels Möller's avatar
Niels Möller committed
197
  if ( (out = dup(STDOUT_FILENO)) < 0)
198 199 200 201
    {
      werror("Can't dup stdout: %s\n", strerror(errno));
      return EXIT_FAILURE;
    }
Niels Möller's avatar
Niels Möller committed
202
  if ( (err = dup(STDERR_FILENO)) < 0)
203 204 205 206 207
    {
      werror("Can't dup stderr: %s\n", strerror(errno));
      return EXIT_FAILURE;
    }
  
208
  service = make_connection_service
209
    (make_alist(0, -1),
Niels Möller's avatar
Niels Möller committed
210
     make_alist(0, -1),
211
     make_client_startup(io_read(&backend, in, NULL, NULL),
212 213
			 io_write(&backend, out, BLOCK_SIZE, NULL),
			 io_write(&backend, err, BLOCK_SIZE, NULL),
Niels Möller's avatar
Niels Möller committed
214
			 ATOM_SHELL, ssh_format(""), &lsh_exit_code));
215 216 217 218
  
  kexinit_handler = make_kexinit_handler
    (CONNECTION_CLIENT,
     make_kexinit, algorithms,
Niels Möller's avatar
Niels Möller committed
219 220 221 222 223
     request_service(ATOM_SSH_USERAUTH, 
		     make_client_userauth(ssh_format("%lz", user),
					  ATOM_SSH_CONNECTION,
					  service)));
  
Niels Möller's avatar
Niels Möller committed
224 225 226
  if (!io_connect(&backend, &remote, NULL,
		  make_client_callback(&backend,
				       "lsh - a free ssh",
227
				       SSH_MAX_PACKET,
Niels Möller's avatar
Niels Möller committed
228 229
				       r, make_kexinit,
				       kexinit_handler)))
Niels Möller's avatar
Niels Möller committed
230 231 232 233 234
    {
      werror("lsh: Connection failed: %s\n", strerror(errno));
      return 1;
    }
  
Niels Möller's avatar
Niels Möller committed
235
  lsh_string_free(random_seed);
Niels Möller's avatar
Niels Möller committed
236 237 238

  /* Exit code if no session is established */
  lsh_exit_code = 17;
Niels Möller's avatar
Niels Möller committed
239
  
Niels Möller's avatar
Niels Möller committed
240
  io_run(&backend);
Niels Möller's avatar
Niels Möller committed
241

Niels Möller's avatar
Niels Möller committed
242
  return lsh_exit_code;
Niels Möller's avatar
Niels Möller committed
243 244 245
}