Mercurial > dropbear

annotate cli-main.c @ 1804:f0cd000f3bca

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Prevent multiple shells being spawned Existing shells would be leaked. The old check only caught multiple commands, not shells.
author Matt Johnston <matt@ucc.asn.au>
date Sat, 06 Mar 2021 23:06:43 +0800
parents f0a524208d97
children 1d86a58fb52d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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74
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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diff changeset
1 /*
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2 * Dropbear - a SSH2 server
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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3 * SSH client implementation
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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4 *
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5 * Copyright (c) 2002,2003 Matt Johnston
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6 * Copyright (c) 2004 by Mihnea Stoenescu
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7 * All rights reserved.
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8 *
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9 * Permission is hereby granted, free of charge, to any person obtaining a copy
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10 * of this software and associated documentation files (the "Software"), to deal
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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11 * in the Software without restriction, including without limitation the rights
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12 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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13 * copies of the Software, and to permit persons to whom the Software is
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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14 * furnished to do so, subject to the following conditions:
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15 *
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16 * The above copyright notice and this permission notice shall be included in
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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17 * all copies or substantial portions of the Software.
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18 *
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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20 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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22 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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23 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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24 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
e3adf4cf5465 License boilerplate etc, add Mihnea as an author to some of the files
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25 * SOFTWARE. */
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26
33
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27 #include "includes.h"
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28 #include "dbutil.h"
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29 #include "runopts.h"
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30 #include "session.h"
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31 #include "dbrandom.h"
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32 #include "crypto_desc.h"
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33 #include "netio.h"
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34 #include "fuzz.h"
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35
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36 #if DROPBEAR_CLI_PROXYCMD
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37 static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out);
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38 static void kill_proxy_sighandler(int signo);
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39 #endif
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40
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41 #if defined(DBMULTI_dbclient) || !DROPBEAR_MULTI
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42 #if defined(DBMULTI_dbclient) && DROPBEAR_MULTI
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43 int cli_main(int argc, char ** argv) {
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44 #else
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45 int main(int argc, char ** argv) {
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46 #endif
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47
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48 int sock_in, sock_out;
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49 struct dropbear_progress_connection *progress = NULL;
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50 pid_t proxy_cmd_pid = 0;
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51
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52 _dropbear_exit = cli_dropbear_exit;
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53 _dropbear_log = cli_dropbear_log;
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54
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55 disallow_core();
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56
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57 seedrandom();
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58 crypto_init();
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59
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60 cli_getopts(argc, argv);
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61
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62 #ifndef DISABLE_SYSLOG
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63 if (opts.usingsyslog) {
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64 startsyslog("dbclient");
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65 }
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66 #endif
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67
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68 TRACE(("user='%s' host='%s' port='%s' bind_address='%s' bind_port='%s'", cli_opts.username,
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69 cli_opts.remotehost, cli_opts.remoteport, cli_opts.bind_address, cli_opts.bind_port))
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71 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
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72 dropbear_exit("signal() error");
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73 }
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74
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75 #if DROPBEAR_CLI_PROXYCMD
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76 if (cli_opts.proxycmd) {
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77 cli_proxy_cmd(&sock_in, &sock_out, &proxy_cmd_pid);
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78 m_free(cli_opts.proxycmd);
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79 if (signal(SIGINT, kill_proxy_sighandler) == SIG_ERR ||
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80 signal(SIGTERM, kill_proxy_sighandler) == SIG_ERR ||
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81 signal(SIGHUP, kill_proxy_sighandler) == SIG_ERR) {
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82 dropbear_exit("signal() error");
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83 }
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84 } else
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85 #endif
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86 {
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87 progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport,
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88 cli_connected, &ses, cli_opts.bind_address, cli_opts.bind_port);
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89 sock_in = sock_out = -1;
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90 }
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91
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92 cli_session(sock_in, sock_out, progress, proxy_cmd_pid);
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93
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94 /* not reached */
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95 return -1;
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96 }
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97 #endif /* DBMULTI stuff */
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98
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99 static void exec_proxy_cmd(const void *user_data_cmd) {
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100 const char *cmd = user_data_cmd;
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101 char *usershell;
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102
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103 usershell = m_strdup(get_user_shell());
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104 run_shell_command(cmd, ses.maxfd, usershell);
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105 dropbear_exit("Failed to run '%s'\n", cmd);
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106 }
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107
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108 #if DROPBEAR_CLI_PROXYCMD
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109 static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out) {
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110 char * ex_cmd = NULL;
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111 size_t ex_cmdlen;
483
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112 int ret;
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113
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114 /* File descriptor "-j &3" */
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115 if (*cli_opts.proxycmd == '&') {
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116 char *p = cli_opts.proxycmd + 1;
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117 int sock = strtoul(p, &p, 10);
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118 /* must be a single number, and not stdin/stdout/stderr */
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119 if (sock > 2 && sock < 1024 && *p == '\0') {
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120 *sock_in = sock;
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121 *sock_out = sock;
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122 return;
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123 }
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124 }
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125
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126 /* Normal proxycommand */
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127
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128 /* So that spawn_command knows which shell to run */
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129 fill_passwd(cli_opts.own_user);
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130
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131 ex_cmdlen = strlen(cli_opts.proxycmd) + 6; /* "exec " + command + '\0' */
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132 ex_cmd = m_malloc(ex_cmdlen);
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133 snprintf(ex_cmd, ex_cmdlen, "exec %s", cli_opts.proxycmd);
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134
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135 ret = spawn_command(exec_proxy_cmd, ex_cmd,
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136 sock_out, sock_in, NULL, pid_out);
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137 m_free(ex_cmd);
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738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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138 if (ret == DROPBEAR_FAILURE) {
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139 dropbear_exit("Failed running proxy command");
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140 *sock_in = *sock_out = -1;
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141 }
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142 }
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143
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144 static void kill_proxy_sighandler(int UNUSED(signo)) {
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145 kill_proxy_command();
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146 _exit(1);
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147 }
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d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
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148
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149 #endif /* DROPBEAR_CLI_PROXYCMD */