Mercurial > dropbear

annotate svr-session.c @ 447:278805938dcf

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Patch from Nicolai Ehemann to try binding before going to the background, so that if it exits early (because something's already listening etc) then it will return an exitcode of 1.
author Matt Johnston <matt@ucc.asn.au>
date Thu, 19 Jul 2007 15:54:18 +0000
parents c216212001fc
children 7e43f5e473b9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 #include "includes.h"
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26 #include "session.h"
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27 #include "dbutil.h"
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28 #include "packet.h"
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29 #include "algo.h"
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30 #include "buffer.h"
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31 #include "dss.h"
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32 #include "ssh.h"
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33 #include "random.h"
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34 #include "kex.h"
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35 #include "channel.h"
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36 #include "chansession.h"
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37 #include "atomicio.h"
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38 #include "tcpfwd.h"
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39 #include "service.h"
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40 #include "auth.h"
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41 #include "runopts.h"
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42
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43 static void svr_remoteclosed();
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44
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45 struct serversession svr_ses; /* GLOBAL */
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46
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47 static const packettype svr_packettypes[] = {
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48 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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49 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
45
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50 {SSH_MSG_USERAUTH_REQUEST, recv_msg_userauth_request}, /* server */
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51 {SSH_MSG_SERVICE_REQUEST, recv_msg_service_request}, /* server */
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52 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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53 {SSH_MSG_KEXDH_INIT, recv_msg_kexdh_init}, /* server */
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54 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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55 #ifdef ENABLE_SVR_REMOTETCPFWD
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56 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp},
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57 #endif
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58 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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59 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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60 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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61 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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62 #ifdef USING_LISTENERS
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63 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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64 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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65 #endif
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66 {0, 0} /* End */
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67 };
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68
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69 static const struct ChanType *svr_chantypes[] = {
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70 &svrchansess,
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71 #ifdef ENABLE_SVR_LOCALTCPFWD
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72 &svr_chan_tcpdirect,
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73 #endif
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74 NULL /* Null termination is mandatory. */
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75 };
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76
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77 void svr_session(int sock, int childpipe,
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78 char* remotehost, char *addrstring) {
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80 struct timeval timeout;
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81
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82 reseedrandom();
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83
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84 crypto_init();
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85 common_session_init(sock, remotehost);
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86
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87 /* Initialise server specific parts of the session */
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88 svr_ses.childpipe = childpipe;
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89 svr_ses.addrstring = addrstring;
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90 svr_authinitialise();
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91 chaninitialise(svr_chantypes);
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92 svr_chansessinitialise();
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93
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94 if (gettimeofday(&timeout, 0) < 0) {
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95 dropbear_exit("Error getting time");
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96 }
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97
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98 ses.connecttimeout = timeout.tv_sec + AUTH_TIMEOUT;
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99
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100 /* set up messages etc */
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101 ses.remoteclosed = svr_remoteclosed;
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102
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103 /* packet handlers */
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104 ses.packettypes = svr_packettypes;
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105 ses.buf_match_algo = svr_buf_match_algo;
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106
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107 ses.isserver = 1;
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108
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109 /* We're ready to go now */
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110 sessinitdone = 1;
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111
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112 /* exchange identification, version etc */
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113 session_identification();
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114
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115 /* start off with key exchange */
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116 send_msg_kexinit();
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117
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118 /* Run the main for loop. NULL is for the dispatcher - only the client
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119 * code makes use of it */
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120 session_loop(NULL);
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121
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122 /* Not reached */
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123
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124 }
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125
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126 /* failure exit - format must be <= 100 chars */
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127 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
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128
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129 char fmtbuf[300];
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130
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131 if (!sessinitdone) {
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132 /* before session init */
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133 snprintf(fmtbuf, sizeof(fmtbuf),
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134 "premature exit: %s", format);
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135 } else if (ses.authstate.authdone) {
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136 /* user has authenticated */
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137 snprintf(fmtbuf, sizeof(fmtbuf),
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138 "exit after auth (%s): %s",
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139 ses.authstate.printableuser, format);
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140 } else if (ses.authstate.printableuser) {
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141 /* we have a potential user */
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142 snprintf(fmtbuf, sizeof(fmtbuf),
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143 "exit before auth (user '%s', %d fails): %s",
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144 ses.authstate.printableuser, ses.authstate.failcount, format);
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145 } else {
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146 /* before userauth */
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147 snprintf(fmtbuf, sizeof(fmtbuf),
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148 "exit before auth: %s", format);
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149 }
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150
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151 _dropbear_log(LOG_INFO, fmtbuf, param);
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152
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153 /* must be after we've done with username etc */
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154 common_session_cleanup();
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155
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156 exit(exitcode);
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157
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158 }
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159
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160 /* priority is priority as with syslog() */
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161 void svr_dropbear_log(int priority, const char* format, va_list param) {
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162
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163 char printbuf[1024];
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164 char datestr[20];
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165 time_t timesec;
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166 int havetrace = 0;
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167
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168 vsnprintf(printbuf, sizeof(printbuf), format, param);
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169
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170 #ifndef DISABLE_SYSLOG
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171 if (svr_opts.usingsyslog) {
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172 syslog(priority, "%s", printbuf);
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173 }
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174 #endif
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175
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176 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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177 * syslog is used, so it is included in error reports */
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178 #ifdef DEBUG_TRACE
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179 havetrace = debug_trace;
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180 #endif
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181
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182 if (!svr_opts.usingsyslog || havetrace)
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183 {
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184 struct tm * local_tm = NULL;
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185 timesec = time(NULL);
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186 local_tm = localtime(&timesec);
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187 if (local_tm == NULL
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188 || strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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189 localtime(&timesec)) == 0)
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190 {
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191 /* upon failure, just print the epoch-seconds time. */
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192 snprintf(datestr, sizeof(datestr), "%d", timesec);
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193 }
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194 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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195 }
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196 }
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197
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198 /* called when the remote side closes the connection */
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199 static void svr_remoteclosed() {
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200
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201 close(ses.sock);
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202 ses.sock = -1;
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203 dropbear_close("Exited normally");
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204
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205 }
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206