Mercurial > dropbear
annotate svr-session.c @ 900:49ed526daedc
CHANGES for 2014.63
author | Matt Johnston <matt@ucc.asn.au> |
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date | Wed, 19 Feb 2014 22:01:01 +0800 |
parents | 5bfce5dcd461 |
children | bae0b34bc059 7cd89d4e0335 |
rev | line source |
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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 "dbrandom.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" |
24 | 41 #include "runopts.h" |
766 | 42 #include "crypto_desc.h" |
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43 |
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44 static void svr_remoteclosed(); |
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45 |
24 | 46 struct serversession svr_ses; /* GLOBAL */ |
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47 |
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48 static const packettype svr_packettypes[] = { |
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49 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data}, |
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50 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, |
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51 {SSH_MSG_USERAUTH_REQUEST, recv_msg_userauth_request}, /* server */ |
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52 {SSH_MSG_SERVICE_REQUEST, recv_msg_service_request}, /* server */ |
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53 {SSH_MSG_KEXINIT, recv_msg_kexinit}, |
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54 {SSH_MSG_KEXDH_INIT, recv_msg_kexdh_init}, /* server */ |
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55 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, |
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56 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp}, |
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57 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, |
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58 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, |
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59 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, |
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60 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, |
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61 #ifdef USING_LISTENERS |
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62 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, |
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63 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, |
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64 #endif |
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65 {0, 0} /* End */ |
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66 }; |
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67 |
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68 static const struct ChanType *svr_chantypes[] = { |
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69 &svrchansess, |
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70 #ifdef ENABLE_SVR_LOCALTCPFWD |
62 | 71 &svr_chan_tcpdirect, |
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72 #endif |
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73 NULL /* Null termination is mandatory. */ |
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74 }; |
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75 |
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76 static void |
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77 svr_session_cleanup(void) |
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78 { |
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79 /* free potential public key options */ |
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80 svr_pubkey_options_cleanup(); |
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81 } |
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82 |
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83 void svr_session(int sock, int childpipe) { |
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84 char *host, *port; |
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85 size_t len; |
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86 |
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87 common_session_init(sock, sock); |
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88 |
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89 /* Initialise server specific parts of the session */ |
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90 svr_ses.childpipe = childpipe; |
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91 #ifdef USE_VFORK |
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92 svr_ses.server_pid = getpid(); |
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93 #endif |
33 | 94 svr_authinitialise(); |
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95 chaninitialise(svr_chantypes); |
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96 svr_chansessinitialise(); |
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97 |
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98 ses.connect_time = time(NULL); |
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99 |
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100 /* for logging the remote address */ |
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101 get_socket_address(ses.sock_in, NULL, NULL, &host, &port, 0); |
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102 len = strlen(host) + strlen(port) + 2; |
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103 svr_ses.addrstring = m_malloc(len); |
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104 snprintf(svr_ses.addrstring, len, "%s:%s", host, port); |
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105 m_free(host); |
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106 m_free(port); |
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107 |
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108 get_socket_address(ses.sock_in, NULL, NULL, |
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109 &svr_ses.remotehost, NULL, 1); |
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110 |
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111 /* set up messages etc */ |
33 | 112 ses.remoteclosed = svr_remoteclosed; |
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113 ses.extra_session_cleanup = svr_session_cleanup; |
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114 |
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115 /* packet handlers */ |
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116 ses.packettypes = svr_packettypes; |
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117 |
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118 ses.isserver = 1; |
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119 |
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120 /* We're ready to go now */ |
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121 sessinitdone = 1; |
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122 |
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123 /* exchange identification, version etc */ |
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124 send_session_identification(); |
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125 |
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126 /* start off with key exchange */ |
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127 send_msg_kexinit(); |
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128 |
26 | 129 /* Run the main for loop. NULL is for the dispatcher - only the client |
130 * code makes use of it */ | |
131 session_loop(NULL); | |
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132 |
26 | 133 /* Not reached */ |
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134 |
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135 } |
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136 |
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137 /* failure exit - format must be <= 100 chars */ |
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138 void svr_dropbear_exit(int exitcode, const char* format, va_list param) { |
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139 |
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140 char fmtbuf[300]; |
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141 |
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142 if (!sessinitdone) { |
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143 /* before session init */ |
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144 snprintf(fmtbuf, sizeof(fmtbuf), |
876 | 145 "Early exit: %s", format); |
33 | 146 } else if (ses.authstate.authdone) { |
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147 /* user has authenticated */ |
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148 snprintf(fmtbuf, sizeof(fmtbuf), |
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149 "Exit (%s): %s", |
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150 ses.authstate.pw_name, format); |
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151 } else if (ses.authstate.pw_name) { |
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152 /* we have a potential user */ |
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153 snprintf(fmtbuf, sizeof(fmtbuf), |
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154 "Exit before auth (user '%s', %d fails): %s", |
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155 ses.authstate.pw_name, ses.authstate.failcount, format); |
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156 } else { |
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157 /* before userauth */ |
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158 snprintf(fmtbuf, sizeof(fmtbuf), |
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159 "Exit before auth: %s", format); |
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160 } |
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161 |
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162 _dropbear_log(LOG_INFO, fmtbuf, param); |
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163 |
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164 #ifdef USE_VFORK |
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165 /* For uclinux only the main server process should cleanup - we don't want |
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166 * forked children doing that */ |
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167 if (svr_ses.server_pid == getpid()) |
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168 #endif |
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169 { |
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170 /* must be after we've done with username etc */ |
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171 session_cleanup(); |
553
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172 } |
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173 |
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174 exit(exitcode); |
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175 |
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176 } |
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177 |
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178 /* priority is priority as with syslog() */ |
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179 void svr_dropbear_log(int priority, const char* format, va_list param) { |
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180 |
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181 char printbuf[1024]; |
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182 char datestr[20]; |
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183 time_t timesec; |
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184 int havetrace = 0; |
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185 |
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186 vsnprintf(printbuf, sizeof(printbuf), format, param); |
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187 |
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188 #ifndef DISABLE_SYSLOG |
24 | 189 if (svr_opts.usingsyslog) { |
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190 syslog(priority, "%s", printbuf); |
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191 } |
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192 #endif |
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193 |
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194 /* if we are using DEBUG_TRACE, we want to print to stderr even if |
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195 * syslog is used, so it is included in error reports */ |
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196 #ifdef DEBUG_TRACE |
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197 havetrace = debug_trace; |
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198 #endif |
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199 |
24 | 200 if (!svr_opts.usingsyslog || havetrace) |
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201 { |
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202 struct tm * local_tm = NULL; |
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203 timesec = time(NULL); |
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204 local_tm = localtime(×ec); |
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205 if (local_tm == NULL |
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206 || strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S", |
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207 local_tm) == 0) |
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208 { |
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209 /* upon failure, just print the epoch-seconds time. */ |
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210 snprintf(datestr, sizeof(datestr), "%d", (int)timesec); |
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211 } |
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212 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf); |
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213 } |
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214 } |
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215 |
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216 /* called when the remote side closes the connection */ |
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217 static void svr_remoteclosed() { |
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218 |
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219 m_close(ses.sock_in); |
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220 m_close(ses.sock_out); |
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221 ses.sock_in = -1; |
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222 ses.sock_out = -1; |
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223 dropbear_close("Exited normally"); |
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224 |
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225 } |
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226 |