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annotate svr-session.c @ 9:7f77962de998

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- Reworked non-channel fd handling to listener.c - More channel cleaning up
author Matt Johnston <matt@ucc.asn.au>
date Thu, 03 Jun 2004 16:45:53 +0000
parents 425ed5c20157
children 5ae28f6101c1
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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-direct.h"
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39
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40 static void svr_remoteclosed();
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41
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42 struct serversession svr_ses;
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43
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44 const struct ChanType *chantypes[] = {
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45 &svrchansess,
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46 &chan_tcpdirect,
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47 NULL /* Null termination is mandatory. */
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48 };
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49
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50
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51 void svr_session(int sock, runopts *opts, int childpipe,
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52 struct sockaddr* remoteaddr) {
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53
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54 fd_set readfd, writefd;
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55 struct timeval timeout;
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56 int val;
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57
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58 crypto_init();
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59 common_session_init(sock, opts);
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60
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61 ses.remoteaddr = remoteaddr;
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62 ses.remotehost = getaddrhostname(remoteaddr);
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63
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64 /* Initialise server specific parts of the session */
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65 svr_ses.childpipe = childpipe;
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66 authinitialise();
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67 chaninitialise(chantypes);
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68 svr_chansessinitialise();
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69
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70 if (gettimeofday(&timeout, 0) < 0) {
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71 dropbear_exit("Error getting time");
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72 }
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73
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74 ses.connecttimeout = timeout.tv_sec + AUTH_TIMEOUT;
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75
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76 /* set up messages etc */
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77 session_remoteclosed = svr_remoteclosed;
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78
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79 /* We're ready to go now */
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80 sessinitdone = 1;
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81
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82 /* exchange identification, version etc */
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83 session_identification();
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84
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85 seedrandom();
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86
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87 /* start off with key exchange */
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88 send_msg_kexinit();
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89
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90 FD_ZERO(&readfd);
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91 FD_ZERO(&writefd);
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92
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93 /* main loop, select()s for all sockets in use */
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94 for(;;) {
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95
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96 timeout.tv_sec = SELECT_TIMEOUT;
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97 timeout.tv_usec = 0;
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98 FD_ZERO(&writefd);
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99 FD_ZERO(&readfd);
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100 assert(ses.payload == NULL);
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101 if (ses.sock != -1) {
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102 FD_SET(ses.sock, &readfd);
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103 if (!isempty(&ses.writequeue)) {
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104 FD_SET(ses.sock, &writefd);
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105 }
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106 }
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107
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108 /* set up for channels which require reading/writing */
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109 if (ses.dataallowed) {
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110 setchannelfds(&readfd, &writefd);
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111 }
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112 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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113
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114 if (exitflag) {
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115 dropbear_exit("Terminated by signal");
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116 }
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117
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118 if (val < 0) {
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119 if (errno == EINTR) {
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120 continue;
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121 } else {
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122 dropbear_exit("Error in select");
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123 }
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124 }
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125
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126 /* check for auth timeout, rekeying required etc */
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127 checktimeouts();
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128
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129 if (val == 0) {
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130 /* timeout */
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131 TRACE(("select timeout"));
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132 continue;
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133 }
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134
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135 /* process session socket's incoming/outgoing data */
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136 if (ses.sock != -1) {
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137 if (FD_ISSET(ses.sock, &writefd) && !isempty(&ses.writequeue)) {
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138 write_packet();
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139 }
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140
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141 if (FD_ISSET(ses.sock, &readfd)) {
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142 read_packet();
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143 }
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144
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145 /* Process the decrypted packet. After this, the read buffer
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146 * will be ready for a new packet */
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147 if (ses.payload != NULL) {
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148 svr_process_packet();
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149 }
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150 }
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151
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152 /* process pipes etc for the channels, ses.dataallowed == 0
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153 * during rekeying ) */
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154 if (ses.dataallowed) {
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155 channelio(&readfd, &writefd);
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156 }
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157
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158 } /* for(;;) */
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159 }
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160
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161 /* failure exit - format must be <= 100 chars */
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162 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
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163
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164 char fmtbuf[300];
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165
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166 if (!sessinitdone) {
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167 /* before session init */
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168 snprintf(fmtbuf, sizeof(fmtbuf),
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169 "premature exit: %s", format);
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170 } else if (svr_ses.authstate.authdone) {
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171 /* user has authenticated */
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172 snprintf(fmtbuf, sizeof(fmtbuf),
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173 "exit after auth (%s): %s",
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174 svr_ses.authstate.printableuser, format);
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175 } else if (svr_ses.authstate.printableuser) {
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176 /* we have a potential user */
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177 snprintf(fmtbuf, sizeof(fmtbuf),
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178 "exit before auth (user '%s', %d fails): %s",
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179 svr_ses.authstate.printableuser, svr_ses.authstate.failcount, format);
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180 } else {
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181 /* before userauth */
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182 snprintf(fmtbuf, sizeof(fmtbuf),
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183 "exit before auth: %s", format);
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184 }
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185
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186 if (errno != 0) {
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187 /* XXX - is this valid? */
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188 snprintf(fmtbuf, sizeof(fmtbuf), "%s [%d %s]", fmtbuf,
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189 errno, strerror(errno));
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190 }
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191
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192 _dropbear_log(LOG_INFO, fmtbuf, param);
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193
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194 /* must be after we've done with username etc */
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195 common_session_cleanup();
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196
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197 exit(exitcode);
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198
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199 }
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200
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201 /* priority is priority as with syslog() */
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202 void svr_dropbear_log(int priority, const char* format, va_list param) {
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203
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204 char printbuf[1024];
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205 char datestr[20];
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206 time_t timesec;
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207 int havetrace = 0;
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208
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209 vsnprintf(printbuf, sizeof(printbuf), format, param);
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210
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211 #ifndef DISABLE_SYSLOG
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212 if (usingsyslog) {
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213 syslog(priority, "%s", printbuf);
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214 }
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215 #endif
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216
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217 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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218 * syslog is used, so it is included in error reports */
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219 #ifdef DEBUG_TRACE
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220 havetrace = 1;
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221 #endif
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222
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223 if (!usingsyslog || havetrace)
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224 {
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225 timesec = time(NULL);
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226 if (strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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227 localtime(&timesec)) == 0) {
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228 datestr[0] = '?'; datestr[1] = '\0';
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229 }
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230 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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231 }
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232 }
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233
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234 /* called when the remote side closes the connection */
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235 static void svr_remoteclosed() {
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236
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237 close(ses.sock);
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238 ses.sock = -1;
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239 dropbear_close("Exited normally");
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240
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241 }
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242