Mercurial > dropbear

annotate cli-main.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents 62e4baa059c3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
74
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1 /*
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2 * Dropbear - a SSH2 server
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3 * SSH client implementation
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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
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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
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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
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17 * all copies or substantial portions of the Software.
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18 *
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19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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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
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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 if (cli_opts.bind_address) {
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69 DEBUG1(("connect to: user=%s host=%s/%s bind_address=%s:%s", cli_opts.username,
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70 cli_opts.remotehost, cli_opts.remoteport, cli_opts.bind_address, cli_opts.bind_port))
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71 } else {
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72 DEBUG1(("connect to: user=%s host=%s/%s",cli_opts.username,cli_opts.remotehost,cli_opts.remoteport))
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73 }
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75 if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
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76 dropbear_exit("signal() error");
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77 }
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78
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79 #if DROPBEAR_CLI_PROXYCMD
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80 if (cli_opts.proxycmd) {
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81 cli_proxy_cmd(&sock_in, &sock_out, &proxy_cmd_pid);
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82 m_free(cli_opts.proxycmd);
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83 if (signal(SIGINT, kill_proxy_sighandler) == SIG_ERR ||
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84 signal(SIGTERM, kill_proxy_sighandler) == SIG_ERR ||
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85 signal(SIGHUP, kill_proxy_sighandler) == SIG_ERR) {
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86 dropbear_exit("signal() error");
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87 }
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88 } else
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89 #endif
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90 {
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91 progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport,
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92 cli_connected, &ses, cli_opts.bind_address, cli_opts.bind_port,
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93 DROPBEAR_PRIO_LOWDELAY);
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94 sock_in = sock_out = -1;
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95 }
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96
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97 cli_session(sock_in, sock_out, progress, proxy_cmd_pid);
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98
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99 /* not reached */
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100 return -1;
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101 }
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102 #endif /* DBMULTI stuff */
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103
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104 static void exec_proxy_cmd(const void *user_data_cmd) {
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105 const char *cmd = user_data_cmd;
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106 char *usershell;
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107
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108 usershell = m_strdup(get_user_shell());
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109 run_shell_command(cmd, ses.maxfd, usershell);
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110 dropbear_exit("Failed to run '%s'\n", cmd);
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111 }
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112
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113 #if DROPBEAR_CLI_PROXYCMD
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114 static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out) {
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115 char * ex_cmd = NULL;
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116 size_t ex_cmdlen;
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117 int ret;
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118
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119 /* File descriptor "-j &3" */
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120 if (*cli_opts.proxycmd == '&') {
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121 char *p = cli_opts.proxycmd + 1;
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122 int sock = strtoul(p, &p, 10);
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123 /* must be a single number, and not stdin/stdout/stderr */
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124 if (sock > 2 && sock < 1024 && *p == '\0') {
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125 *sock_in = sock;
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126 *sock_out = sock;
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127 return;
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128 }
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129 }
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130
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131 /* Normal proxycommand */
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132
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133 /* So that spawn_command knows which shell to run */
483
738313e73b1c - "-J 'nc localhost 22'" kind of works, needs fixing hostkeys, ptys etc.
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parents: 479
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134 fill_passwd(cli_opts.own_user);
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135
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parents: 1216
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136 ex_cmdlen = strlen(cli_opts.proxycmd) + 6; /* "exec " + command + '\0' */
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parents: 1216
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137 ex_cmd = m_malloc(ex_cmdlen);
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138 snprintf(ex_cmd, ex_cmdlen, "exec %s", cli_opts.proxycmd);
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139
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140 ret = spawn_command(exec_proxy_cmd, ex_cmd,
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Konstantin Tokarev <ktokarev@smartlabs.tv>
parents: 1065
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141 sock_out, sock_in, NULL, pid_out);
1894
62e4baa059c3 changed TRACE to DEBUG1 for dbclient
HansH111 <hans@atbas.org>
parents: 1859
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142 DEBUG1(("cmd: %s pid=%d", ex_cmd,*pid_out))
1221
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parents: 1216
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143 m_free(ex_cmd);
483
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parents: 479
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144 if (ret == DROPBEAR_FAILURE) {
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145 dropbear_exit("Failed running proxy command");
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parents: 479
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146 *sock_in = *sock_out = -1;
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parents: 479
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147 }
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parents: 479
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148 }
1208
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Konstantin Tokarev <ktokarev@smartlabs.tv>
parents: 1065
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149
1216
3daff2072bd0 rename killchild to kill_proxy_sighandler
Matt Johnston <matt@ucc.asn.au>
parents: 1215
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150 static void kill_proxy_sighandler(int UNUSED(signo)) {
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Konstantin Tokarev <ktokarev@smartlabs.tv>
parents: 1065
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151 kill_proxy_command();
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Matt Johnston <matt@ucc.asn.au>
parents: 1215
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152 _exit(1);
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parents: 1065
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153 }
1741
d1b279aa5ed1 Get client fuzzer building and starting (fails straight away)
Matt Johnston <matt@ucc.asn.au>
parents: 1697
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154
1295
750ec4ec4cbe Convert #ifdef to #if, other build changes
Matt Johnston <matt@ucc.asn.au>
parents: 1221
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155 #endif /* DROPBEAR_CLI_PROXYCMD */