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annotate svr-session.c @ 5:bc6477a6c393

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syntactical fixups - it compiles, but channel handling code requires fixing.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 04:20:12 +0000
parents fe6bca95afa7
children ab00ef513e97
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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
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39 static void svr_remoteclosed();
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40
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41 struct serversession svr_ses;
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42
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43 void svr_session(int sock, runopts *opts, int childpipe,
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44 struct sockaddr* remoteaddr) {
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45
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46 fd_set readfd, writefd;
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47 struct timeval timeout;
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48 int val;
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49
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50 crypto_init();
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51 common_session_init(sock, opts);
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52
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53 ses.remoteaddr = remoteaddr;
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54 ses.remotehost = getaddrhostname(remoteaddr);
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55
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56 /* Initialise server specific parts of the session */
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57 svr_ses.childpipe = childpipe;
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58 authinitialise();
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59 svr_chansessinitialise();
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60
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61 if (gettimeofday(&timeout, 0) < 0) {
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62 dropbear_exit("Error getting time");
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63 }
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64
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65 ses.connecttimeout = timeout.tv_sec + AUTH_TIMEOUT;
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66
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67 /* set up messages etc */
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68 session_remoteclosed = svr_remoteclosed;
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69
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70 /* We're ready to go now */
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71 sessinitdone = 1;
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72
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73 /* exchange identification, version etc */
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74 session_identification();
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75
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76 seedrandom();
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77
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78 /* start off with key exchange */
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79 send_msg_kexinit();
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80
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81 FD_ZERO(&readfd);
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82 FD_ZERO(&writefd);
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83
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84 /* main loop, select()s for all sockets in use */
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85 for(;;) {
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86
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87 timeout.tv_sec = SELECT_TIMEOUT;
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88 timeout.tv_usec = 0;
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89 FD_ZERO(&writefd);
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90 FD_ZERO(&readfd);
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91 assert(ses.payload == NULL);
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92 if (ses.sock != -1) {
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93 FD_SET(ses.sock, &readfd);
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94 if (!isempty(&ses.writequeue)) {
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95 FD_SET(ses.sock, &writefd);
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96 }
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97 }
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98
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99 /* set up for channels which require reading/writing */
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100 if (ses.dataallowed) {
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101 setchannelfds(&readfd, &writefd);
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102 }
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103 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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104
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105 if (exitflag) {
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106 dropbear_exit("Terminated by signal");
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107 }
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108
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109 if (val < 0) {
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110 if (errno == EINTR) {
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111 continue;
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112 } else {
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113 dropbear_exit("Error in select");
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114 }
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115 }
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116
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117 /* check for auth timeout, rekeying required etc */
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118 checktimeouts();
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119
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120 if (val == 0) {
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121 /* timeout */
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122 TRACE(("select timeout"));
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123 continue;
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124 }
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125
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126 /* process session socket's incoming/outgoing data */
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127 if (ses.sock != -1) {
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128 if (FD_ISSET(ses.sock, &writefd) && !isempty(&ses.writequeue)) {
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129 write_packet();
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130 }
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131
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132 if (FD_ISSET(ses.sock, &readfd)) {
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133 read_packet();
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134 }
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135
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136 /* Process the decrypted packet. After this, the read buffer
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137 * will be ready for a new packet */
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138 if (ses.payload != NULL) {
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139 svr_process_packet();
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140 }
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141 }
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142
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143 /* process pipes etc for the channels, ses.dataallowed == 0
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144 * during rekeying ) */
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145 if (ses.dataallowed) {
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146 channelio(&readfd, &writefd);
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147 }
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148
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149 } /* for(;;) */
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150 }
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151
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152 /* failure exit - format must be <= 100 chars */
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bc6477a6c393 syntactical fixups - it compiles, but channel handling code requires fixing.
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153 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
4
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154
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155 char fmtbuf[300];
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156
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157 if (!sessinitdone) {
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158 /* before session init */
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159 snprintf(fmtbuf, sizeof(fmtbuf),
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160 "premature exit: %s", format);
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161 } else if (svr_ses.authstate.authdone) {
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162 /* user has authenticated */
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163 snprintf(fmtbuf, sizeof(fmtbuf),
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164 "exit after auth (%s): %s",
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165 svr_ses.authstate.printableuser, format);
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166 } else if (svr_ses.authstate.printableuser) {
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167 /* we have a potential user */
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168 snprintf(fmtbuf, sizeof(fmtbuf),
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169 "exit before auth (user '%s', %d fails): %s",
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170 svr_ses.authstate.printableuser, svr_ses.authstate.failcount, format);
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171 } else {
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172 /* before userauth */
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173 snprintf(fmtbuf, sizeof(fmtbuf),
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174 "exit before auth: %s", format);
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175 }
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176
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177 if (errno != 0) {
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178 /* XXX - is this valid? */
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179 snprintf(fmtbuf, sizeof(fmtbuf), "%s [%d %s]", fmtbuf,
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180 errno, strerror(errno));
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181 }
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182
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183 _dropbear_log(LOG_INFO, fmtbuf, param);
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184
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185 /* must be after we've done with username etc */
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186 common_session_cleanup();
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187
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188 exit(exitcode);
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189
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190 }
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191
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192 /* priority is priority as with syslog() */
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193 void svr_dropbear_log(int priority, const char* format, va_list param) {
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194
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195 char printbuf[1024];
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196 char datestr[20];
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197 time_t timesec;
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198 int havetrace = 0;
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199
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200 vsnprintf(printbuf, sizeof(printbuf), format, param);
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201
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202 #ifndef DISABLE_SYSLOG
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203 if (usingsyslog) {
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204 syslog(priority, "%s", printbuf);
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205 }
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206 #endif
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207
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208 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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209 * syslog is used, so it is included in error reports */
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210 #ifdef DEBUG_TRACE
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211 havetrace = 1;
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212 #endif
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213
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214 if (!usingsyslog || havetrace)
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215 {
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216 timesec = time(NULL);
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217 if (strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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218 localtime(&timesec)) == 0) {
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219 datestr[0] = '?'; datestr[1] = '\0';
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220 }
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221 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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222 }
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223 }
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224
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225 /* called when the remote side closes the connection */
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226 static void svr_remoteclosed() {
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227
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228 close(ses.sock);
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229 ses.sock = -1;
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230 dropbear_close("Exited normally");
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231
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232 }
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233