Mercurial > dropbear

annotate svr-session.c @ 22:c1e5d9195402

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merge of abac2150ee4f4031a98016241fbd136d24fed127 and ffa047425729e478a5b49b1ab0f8ec71c08a1421
author Matt Johnston <matt@ucc.asn.au>
date Wed, 23 Jun 2004 07:14:16 +0000
parents 5ae28f6101c1
children 469950e86d0f
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-direct.h"
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39 #include "service.h"
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40 #include "auth.h"
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41 #include "tcpfwd-remote.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;
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46
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47 static const packettype svr_packettypes[] = {
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48 /* TYPE, AUTHREQUIRED, FUNCTION */
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49 {SSH_MSG_SERVICE_REQUEST, recv_msg_service_request}, // server
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50 {SSH_MSG_USERAUTH_REQUEST, recv_msg_userauth_request}, //server
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51 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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52 {SSH_MSG_KEXDH_INIT, recv_msg_kexdh_init},
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53 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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54 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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55 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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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 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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62 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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63 {0, 0} /* End */
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64 };
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65
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66 static const struct ChanType *svr_chantypes[] = {
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67 &svrchansess,
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68 &chan_tcpdirect,
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69 NULL /* Null termination is mandatory. */
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70 };
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71
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72 void svr_session(int sock, runopts *opts, int childpipe,
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73 struct sockaddr* remoteaddr) {
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74
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75 fd_set readfd, writefd;
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76 struct timeval timeout;
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77 int val;
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78
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79 crypto_init();
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80 common_session_init(sock, opts);
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81
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82 ses.remoteaddr = remoteaddr;
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83 ses.remotehost = getaddrhostname(remoteaddr);
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84
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85 /* Initialise server specific parts of the session */
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86 svr_ses.childpipe = childpipe;
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87 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 if (gettimeofday(&timeout, 0) < 0) {
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92 dropbear_exit("Error getting time");
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93 }
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94
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95 ses.connecttimeout = timeout.tv_sec + AUTH_TIMEOUT;
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96
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97 /* set up messages etc */
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98 session_remoteclosed = svr_remoteclosed;
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99
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100 /* packet handlers */
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101 ses.packettypes = svr_packettypes;
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102
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103 /* We're ready to go now */
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104 sessinitdone = 1;
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105
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106 /* exchange identification, version etc */
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107 session_identification();
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108
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109 seedrandom();
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110
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111 /* start off with key exchange */
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112 send_msg_kexinit();
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113
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114 FD_ZERO(&readfd);
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115 FD_ZERO(&writefd);
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116
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117 /* main loop, select()s for all sockets in use */
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118 for(;;) {
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119
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120 timeout.tv_sec = SELECT_TIMEOUT;
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121 timeout.tv_usec = 0;
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122 FD_ZERO(&writefd);
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123 FD_ZERO(&readfd);
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124 assert(ses.payload == NULL);
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125 if (ses.sock != -1) {
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126 FD_SET(ses.sock, &readfd);
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127 if (!isempty(&ses.writequeue)) {
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128 FD_SET(ses.sock, &writefd);
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129 }
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130 }
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131
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132 /* set up for channels which require reading/writing */
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133 if (ses.dataallowed) {
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134 setchannelfds(&readfd, &writefd);
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135 }
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136 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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137
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138 if (exitflag) {
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139 dropbear_exit("Terminated by signal");
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140 }
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141
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142 if (val < 0) {
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143 if (errno == EINTR) {
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144 continue;
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145 } else {
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146 dropbear_exit("Error in select");
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147 }
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148 }
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149
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150 /* check for auth timeout, rekeying required etc */
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151 checktimeouts();
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152
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153 if (val == 0) {
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154 /* timeout */
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155 TRACE(("select timeout"));
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156 continue;
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157 }
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158
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159 /* process session socket's incoming/outgoing data */
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160 if (ses.sock != -1) {
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161 if (FD_ISSET(ses.sock, &writefd) && !isempty(&ses.writequeue)) {
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162 write_packet();
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163 }
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164
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165 if (FD_ISSET(ses.sock, &readfd)) {
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166 read_packet();
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167 }
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168
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169 /* Process the decrypted packet. After this, the read buffer
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170 * will be ready for a new packet */
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171 if (ses.payload != NULL) {
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172 process_packet();
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173 }
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174 }
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175
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176 /* process pipes etc for the channels, ses.dataallowed == 0
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177 * during rekeying ) */
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178 if (ses.dataallowed) {
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179 channelio(&readfd, &writefd);
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180 }
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181
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182 } /* for(;;) */
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183 }
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184
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185 /* failure exit - format must be <= 100 chars */
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186 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
4
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187
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188 char fmtbuf[300];
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189
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190 if (!sessinitdone) {
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191 /* before session init */
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192 snprintf(fmtbuf, sizeof(fmtbuf),
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193 "premature exit: %s", format);
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194 } else if (svr_ses.authstate.authdone) {
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195 /* user has authenticated */
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196 snprintf(fmtbuf, sizeof(fmtbuf),
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197 "exit after auth (%s): %s",
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198 svr_ses.authstate.printableuser, format);
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199 } else if (svr_ses.authstate.printableuser) {
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200 /* we have a potential user */
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201 snprintf(fmtbuf, sizeof(fmtbuf),
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202 "exit before auth (user '%s', %d fails): %s",
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203 svr_ses.authstate.printableuser, svr_ses.authstate.failcount, format);
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204 } else {
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205 /* before userauth */
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206 snprintf(fmtbuf, sizeof(fmtbuf),
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207 "exit before auth: %s", format);
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208 }
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209
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210 _dropbear_log(LOG_INFO, fmtbuf, param);
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211
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212 /* must be after we've done with username etc */
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213 common_session_cleanup();
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214
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215 exit(exitcode);
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216
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217 }
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218
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219 /* priority is priority as with syslog() */
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220 void svr_dropbear_log(int priority, const char* format, va_list param) {
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221
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222 char printbuf[1024];
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223 char datestr[20];
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224 time_t timesec;
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225 int havetrace = 0;
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226
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227 vsnprintf(printbuf, sizeof(printbuf), format, param);
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228
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229 #ifndef DISABLE_SYSLOG
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230 if (usingsyslog) {
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231 syslog(priority, "%s", printbuf);
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232 }
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233 #endif
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234
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235 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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236 * syslog is used, so it is included in error reports */
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237 #ifdef DEBUG_TRACE
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238 havetrace = 1;
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239 #endif
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240
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241 if (!usingsyslog || havetrace)
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242 {
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243 timesec = time(NULL);
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244 if (strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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245 localtime(&timesec)) == 0) {
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246 datestr[0] = '?'; datestr[1] = '\0';
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247 }
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248 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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249 }
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250 }
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251
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252 /* called when the remote side closes the connection */
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253 static void svr_remoteclosed() {
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254
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255 close(ses.sock);
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256 ses.sock = -1;
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257 dropbear_close("Exited normally");
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258
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259 }
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260