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annotate svr-session.c @ 6:ab00ef513e97

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Sorted out the first channel init issues.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 10:48:46 +0000
parents bc6477a6c393
children 425ed5c20157
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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 const struct ChanType *chantypes[] = {
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44 &svrchansess,
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45 NULL /* Null termination is mandatory. */
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46 };
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47
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48
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49 void svr_session(int sock, runopts *opts, int childpipe,
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50 struct sockaddr* remoteaddr) {
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51
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52 fd_set readfd, writefd;
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53 struct timeval timeout;
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54 int val;
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55
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56 crypto_init();
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57 common_session_init(sock, opts);
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58
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59 ses.remoteaddr = remoteaddr;
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60 ses.remotehost = getaddrhostname(remoteaddr);
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61
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62 /* Initialise server specific parts of the session */
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63 svr_ses.childpipe = childpipe;
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64 authinitialise();
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65 chaninitialise(chantypes);
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66 svr_chansessinitialise();
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67
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68 if (gettimeofday(&timeout, 0) < 0) {
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69 dropbear_exit("Error getting time");
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70 }
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71
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72 ses.connecttimeout = timeout.tv_sec + AUTH_TIMEOUT;
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73
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74 /* set up messages etc */
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75 session_remoteclosed = svr_remoteclosed;
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76
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77 /* We're ready to go now */
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78 sessinitdone = 1;
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79
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80 /* exchange identification, version etc */
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81 session_identification();
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82
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83 seedrandom();
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84
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85 /* start off with key exchange */
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86 send_msg_kexinit();
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87
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88 FD_ZERO(&readfd);
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89 FD_ZERO(&writefd);
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90
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91 /* main loop, select()s for all sockets in use */
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92 for(;;) {
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93
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94 timeout.tv_sec = SELECT_TIMEOUT;
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95 timeout.tv_usec = 0;
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96 FD_ZERO(&writefd);
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97 FD_ZERO(&readfd);
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98 assert(ses.payload == NULL);
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99 if (ses.sock != -1) {
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100 FD_SET(ses.sock, &readfd);
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101 if (!isempty(&ses.writequeue)) {
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102 FD_SET(ses.sock, &writefd);
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103 }
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104 }
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105
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106 /* set up for channels which require reading/writing */
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107 if (ses.dataallowed) {
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108 setchannelfds(&readfd, &writefd);
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109 }
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110 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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111
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112 if (exitflag) {
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113 dropbear_exit("Terminated by signal");
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114 }
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115
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116 if (val < 0) {
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117 if (errno == EINTR) {
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118 continue;
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119 } else {
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120 dropbear_exit("Error in select");
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121 }
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122 }
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123
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124 /* check for auth timeout, rekeying required etc */
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125 checktimeouts();
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126
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127 if (val == 0) {
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128 /* timeout */
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129 TRACE(("select timeout"));
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130 continue;
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131 }
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132
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133 /* process session socket's incoming/outgoing data */
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134 if (ses.sock != -1) {
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135 if (FD_ISSET(ses.sock, &writefd) && !isempty(&ses.writequeue)) {
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136 write_packet();
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137 }
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138
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139 if (FD_ISSET(ses.sock, &readfd)) {
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140 read_packet();
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141 }
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142
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143 /* Process the decrypted packet. After this, the read buffer
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144 * will be ready for a new packet */
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145 if (ses.payload != NULL) {
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146 svr_process_packet();
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147 }
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148 }
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149
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150 /* process pipes etc for the channels, ses.dataallowed == 0
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151 * during rekeying ) */
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152 if (ses.dataallowed) {
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153 channelio(&readfd, &writefd);
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154 }
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155
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156 } /* for(;;) */
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157 }
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158
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159 /* failure exit - format must be <= 100 chars */
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160 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
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161
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162 char fmtbuf[300];
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163
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164 if (!sessinitdone) {
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165 /* before session init */
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166 snprintf(fmtbuf, sizeof(fmtbuf),
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167 "premature exit: %s", format);
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168 } else if (svr_ses.authstate.authdone) {
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169 /* user has authenticated */
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170 snprintf(fmtbuf, sizeof(fmtbuf),
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171 "exit after auth (%s): %s",
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172 svr_ses.authstate.printableuser, format);
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173 } else if (svr_ses.authstate.printableuser) {
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174 /* we have a potential user */
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175 snprintf(fmtbuf, sizeof(fmtbuf),
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176 "exit before auth (user '%s', %d fails): %s",
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177 svr_ses.authstate.printableuser, svr_ses.authstate.failcount, format);
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178 } else {
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179 /* before userauth */
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180 snprintf(fmtbuf, sizeof(fmtbuf),
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181 "exit before auth: %s", format);
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182 }
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183
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184 if (errno != 0) {
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185 /* XXX - is this valid? */
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186 snprintf(fmtbuf, sizeof(fmtbuf), "%s [%d %s]", fmtbuf,
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187 errno, strerror(errno));
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188 }
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189
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190 _dropbear_log(LOG_INFO, fmtbuf, param);
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191
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192 /* must be after we've done with username etc */
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193 common_session_cleanup();
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194
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195 exit(exitcode);
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196
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197 }
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198
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199 /* priority is priority as with syslog() */
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200 void svr_dropbear_log(int priority, const char* format, va_list param) {
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201
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202 char printbuf[1024];
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203 char datestr[20];
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204 time_t timesec;
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205 int havetrace = 0;
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206
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207 vsnprintf(printbuf, sizeof(printbuf), format, param);
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208
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209 #ifndef DISABLE_SYSLOG
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210 if (usingsyslog) {
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211 syslog(priority, "%s", printbuf);
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212 }
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213 #endif
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214
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215 /* if we are using DEBUG_TRACE, we want to print to stderr even if
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216 * syslog is used, so it is included in error reports */
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217 #ifdef DEBUG_TRACE
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218 havetrace = 1;
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219 #endif
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220
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221 if (!usingsyslog || havetrace)
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222 {
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223 timesec = time(NULL);
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224 if (strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
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225 localtime(&timesec)) == 0) {
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226 datestr[0] = '?'; datestr[1] = '\0';
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227 }
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228 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
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229 }
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230 }
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231
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232 /* called when the remote side closes the connection */
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233 static void svr_remoteclosed() {
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234
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235 close(ses.sock);
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236 ses.sock = -1;
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237 dropbear_close("Exited normally");
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238
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239 }
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240