Mercurial > dropbear

annotate svr-session.c @ 795:7f604f9b3756 ecc

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ecdsa is working
author Matt Johnston <matt@ucc.asn.au>
date Fri, 03 May 2013 23:07:48 +0800
parents d1575fdc29a6
children 7dcb46da72d9
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4
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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 common_session_init(sock, sock);
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81
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82 /* Initialise server specific parts of the session */
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83 svr_ses.childpipe = childpipe;
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84 #ifdef USE_VFORK
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85 svr_ses.server_pid = getpid();
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86 #endif
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87 svr_authinitialise();
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88 chaninitialise(svr_chantypes);
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89 svr_chansessinitialise();
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90
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91 ses.connect_time = time(NULL);
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92
568
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93 /* for logging the remote address */
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94 get_socket_address(ses.sock_in, NULL, NULL, &host, &port, 0);
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95 len = strlen(host) + strlen(port) + 2;
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96 svr_ses.addrstring = m_malloc(len);
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97 snprintf(svr_ses.addrstring, len, "%s:%s", host, port);
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98 m_free(host);
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99 m_free(port);
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100
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101 get_socket_address(ses.sock_in, NULL, NULL,
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102 &svr_ses.remotehost, NULL, 1);
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103
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104 /* set up messages etc */
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105 ses.remoteclosed = svr_remoteclosed;
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106
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107 /* packet handlers */
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108 ses.packettypes = svr_packettypes;
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109 ses.buf_match_algo = svr_buf_match_algo;
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110
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111 ses.isserver = 1;
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112
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113 /* We're ready to go now */
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114 sessinitdone = 1;
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115
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116 /* exchange identification, version etc */
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117 session_identification();
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118
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119 /* start off with key exchange */
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120 send_msg_kexinit();
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121
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122 /* Run the main for loop. NULL is for the dispatcher - only the client
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123 * code makes use of it */
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124 session_loop(NULL);
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125
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126 /* Not reached */
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127
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128 }
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129
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130 /* failure exit - format must be <= 100 chars */
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131 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
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132
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133 char fmtbuf[300];
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134
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135 if (!sessinitdone) {
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136 /* before session init */
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137 snprintf(fmtbuf, sizeof(fmtbuf),
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138 "Premature exit: %s", format);
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139 } else if (ses.authstate.authdone) {
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140 /* user has authenticated */
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141 snprintf(fmtbuf, sizeof(fmtbuf),
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142 "Exit (%s): %s",
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143 ses.authstate.pw_name, format);
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144 } else if (ses.authstate.pw_name) {
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145 /* we have a potential user */
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146 snprintf(fmtbuf, sizeof(fmtbuf),
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147 "Exit before auth (user '%s', %d fails): %s",
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148 ses.authstate.pw_name, ses.authstate.failcount, format);
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149 } else {
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150 /* before userauth */
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151 snprintf(fmtbuf, sizeof(fmtbuf),
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152 "Exit before auth: %s", format);
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153 }
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154
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155 _dropbear_log(LOG_INFO, fmtbuf, param);
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156
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157 #ifdef USE_VFORK
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158 /* For uclinux only the main server process should cleanup - we don't want
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159 * forked children doing that */
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160 if (svr_ses.server_pid == getpid())
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161 #endif
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162 {
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163 /* free potential public key options */
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164 svr_pubkey_options_cleanup();
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165
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166 /* must be after we've done with username etc */
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167 common_session_cleanup();
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168 }
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169
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170 exit(exitcode);
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171
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172 }
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173
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174 /* priority is priority as with syslog() */
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175 void svr_dropbear_log(int priority, const char* format, va_list param) {
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176
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177 char printbuf[1024];
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178 char datestr[20];
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179 time_t timesec;
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180 int havetrace = 0;
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181
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182 vsnprintf(printbuf, sizeof(printbuf), format, param);
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183
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184 #ifndef DISABLE_SYSLOG
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185 if (svr_opts.usingsyslog) {
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186 syslog(priority, "%s", printbuf);
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187 }
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188 #endif
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189
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190 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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191 * syslog is used, so it is included in error reports */
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192 #ifdef DEBUG_TRACE
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193 havetrace = debug_trace;
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194 #endif
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195
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196 if (!svr_opts.usingsyslog || havetrace)
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197 {
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198 struct tm * local_tm = NULL;
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199 timesec = time(NULL);
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200 local_tm = localtime(&timesec);
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201 if (local_tm == NULL
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202 || strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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203 local_tm) == 0)
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204 {
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205 /* upon failure, just print the epoch-seconds time. */
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206 snprintf(datestr, sizeof(datestr), "%d", (int)timesec);
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207 }
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208 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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209 }
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210 }
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211
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212 /* called when the remote side closes the connection */
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213 static void svr_remoteclosed() {
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214
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215 m_close(ses.sock_in);
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216 m_close(ses.sock_out);
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217 ses.sock_in = -1;
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218 ses.sock_out = -1;
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219 dropbear_close("Exited normally");
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220
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221 }
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222