Mercurial > dropbear

annotate svr-session.c @ 766:d1575fdc29a6 ecc

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start on ecdsa keys
author Matt Johnston <matt@ucc.asn.au>
date Tue, 09 Apr 2013 00:36:04 +0800
parents 167fdc091c05
children 7f604f9b3756
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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 #include "crypto_desc.h"
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43
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44 static void svr_remoteclosed();
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45
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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
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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 void svr_session(int sock, int childpipe) {
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77 char *host, *port;
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78 size_t len;
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79
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80 crypto_init();
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81 common_session_init(sock, sock);
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82
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83 /* Initialise server specific parts of the session */
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84 svr_ses.childpipe = childpipe;
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85 #ifdef USE_VFORK
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86 svr_ses.server_pid = getpid();
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87 #endif
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88 svr_authinitialise();
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89 chaninitialise(svr_chantypes);
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90 svr_chansessinitialise();
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91
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92 ses.connect_time = time(NULL);
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93
568
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94 /* for logging the remote address */
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95 get_socket_address(ses.sock_in, NULL, NULL, &host, &port, 0);
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96 len = strlen(host) + strlen(port) + 2;
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97 svr_ses.addrstring = m_malloc(len);
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98 snprintf(svr_ses.addrstring, len, "%s:%s", host, port);
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99 m_free(host);
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100 m_free(port);
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101
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102 get_socket_address(ses.sock_in, NULL, NULL,
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103 &svr_ses.remotehost, NULL, 1);
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104
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105 /* set up messages etc */
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106 ses.remoteclosed = svr_remoteclosed;
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107
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108 /* packet handlers */
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109 ses.packettypes = svr_packettypes;
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110 ses.buf_match_algo = svr_buf_match_algo;
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111
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112 ses.isserver = 1;
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113
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114 /* We're ready to go now */
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115 sessinitdone = 1;
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116
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117 /* exchange identification, version etc */
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118 session_identification();
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119
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120 /* start off with key exchange */
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121 send_msg_kexinit();
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122
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123 /* Run the main for loop. NULL is for the dispatcher - only the client
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124 * code makes use of it */
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125 session_loop(NULL);
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126
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127 /* Not reached */
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128
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129 }
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130
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131 /* failure exit - format must be <= 100 chars */
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132 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
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133
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134 char fmtbuf[300];
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135
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136 if (!sessinitdone) {
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137 /* before session init */
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138 snprintf(fmtbuf, sizeof(fmtbuf),
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139 "Premature exit: %s", format);
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140 } else if (ses.authstate.authdone) {
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141 /* user has authenticated */
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142 snprintf(fmtbuf, sizeof(fmtbuf),
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143 "Exit (%s): %s",
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144 ses.authstate.pw_name, format);
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145 } else if (ses.authstate.pw_name) {
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146 /* we have a potential user */
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147 snprintf(fmtbuf, sizeof(fmtbuf),
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148 "Exit before auth (user '%s', %d fails): %s",
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149 ses.authstate.pw_name, ses.authstate.failcount, format);
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150 } else {
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151 /* before userauth */
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152 snprintf(fmtbuf, sizeof(fmtbuf),
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153 "Exit before auth: %s", format);
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154 }
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155
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156 _dropbear_log(LOG_INFO, fmtbuf, param);
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157
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158 #ifdef USE_VFORK
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159 /* For uclinux only the main server process should cleanup - we don't want
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160 * forked children doing that */
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161 if (svr_ses.server_pid == getpid())
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162 #endif
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163 {
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164 /* free potential public key options */
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165 svr_pubkey_options_cleanup();
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166
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167 /* must be after we've done with username etc */
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168 common_session_cleanup();
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169 }
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170
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171 exit(exitcode);
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172
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173 }
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174
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175 /* priority is priority as with syslog() */
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176 void svr_dropbear_log(int priority, const char* format, va_list param) {
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177
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178 char printbuf[1024];
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179 char datestr[20];
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180 time_t timesec;
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181 int havetrace = 0;
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182
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183 vsnprintf(printbuf, sizeof(printbuf), format, param);
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184
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185 #ifndef DISABLE_SYSLOG
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186 if (svr_opts.usingsyslog) {
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187 syslog(priority, "%s", printbuf);
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188 }
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189 #endif
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190
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191 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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192 * syslog is used, so it is included in error reports */
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193 #ifdef DEBUG_TRACE
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194 havetrace = debug_trace;
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195 #endif
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196
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197 if (!svr_opts.usingsyslog || havetrace)
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198 {
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199 struct tm * local_tm = NULL;
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200 timesec = time(NULL);
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201 local_tm = localtime(&timesec);
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202 if (local_tm == NULL
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203 || strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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204 local_tm) == 0)
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205 {
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206 /* upon failure, just print the epoch-seconds time. */
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207 snprintf(datestr, sizeof(datestr), "%d", (int)timesec);
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208 }
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209 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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210 }
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211 }
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212
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213 /* called when the remote side closes the connection */
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214 static void svr_remoteclosed() {
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215
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216 m_close(ses.sock_in);
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217 m_close(ses.sock_out);
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218 ses.sock_in = -1;
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219 ses.sock_out = -1;
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220 dropbear_close("Exited normally");
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221
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222 }
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223