Mercurial > dropbear

annotate common-session.c @ 373:70caa99bfe3a channel-fix

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Tidy up behaviour when select() is interrupted. We follow normal codepaths, just with no FDs set.
author Matt Johnston <matt@ucc.asn.au>
date Tue, 05 Dec 2006 13:27:59 +0000
parents bf29e6659fb9
children a01c0c8e543a
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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 "atomicio.h"
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37
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38 static void checktimeouts();
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39 static int ident_readln(int fd, char* buf, int count);
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40
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41 struct sshsession ses; /* GLOBAL */
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43 /* need to know if the session struct has been initialised, this way isn't the
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44 * cleanest, but works OK */
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45 int sessinitdone = 0; /* GLOBAL */
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47 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */
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48 int exitflag = 0; /* GLOBAL */
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51
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52 /* called only at the start of a session, set up initial state */
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53 void common_session_init(int sock, char* remotehost) {
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54
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55 TRACE(("enter session_init"))
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56
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57 ses.remotehost = remotehost;
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59 ses.sock = sock;
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60 ses.maxfd = sock;
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61
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62 ses.connecttimeout = 0;
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63
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64 kexfirstinitialise(); /* initialise the kex state */
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65
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66 ses.writepayload = buf_new(MAX_TRANS_PAYLOAD_LEN);
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67 ses.transseq = 0;
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69 ses.readbuf = NULL;
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70 ses.decryptreadbuf = NULL;
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71 ses.payload = NULL;
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72 ses.recvseq = 0;
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73
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74 initqueue(&ses.writequeue);
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75
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76 ses.requirenext = SSH_MSG_KEXINIT;
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77 ses.dataallowed = 0; /* don't send data yet, we'll wait until after kex */
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78 ses.ignorenext = 0;
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79 ses.lastpacket = 0;
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81 /* set all the algos to none */
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82 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
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83 ses.newkeys = NULL;
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84 ses.keys->recv_algo_crypt = &dropbear_nocipher;
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85 ses.keys->trans_algo_crypt = &dropbear_nocipher;
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86
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87 ses.keys->recv_algo_mac = &dropbear_nohash;
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88 ses.keys->trans_algo_mac = &dropbear_nohash;
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89
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90 ses.keys->algo_kex = -1;
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91 ses.keys->algo_hostkey = -1;
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92 ses.keys->recv_algo_comp = DROPBEAR_COMP_NONE;
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93 ses.keys->trans_algo_comp = DROPBEAR_COMP_NONE;
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94
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95 #ifndef DISABLE_ZLIB
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96 ses.keys->recv_zstream = NULL;
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97 ses.keys->trans_zstream = NULL;
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98 #endif
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99
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100 /* key exchange buffers */
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101 ses.session_id = NULL;
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102 ses.kexhashbuf = NULL;
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103 ses.transkexinit = NULL;
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104 ses.dh_K = NULL;
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105 ses.remoteident = NULL;
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106
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107 ses.chantypes = NULL;
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108
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109 ses.allowprivport = 0;
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112 TRACE(("leave session_init"))
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113 }
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114
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115 void session_loop(void(*loophandler)()) {
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116
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117 fd_set readfd, writefd;
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118 struct timeval timeout;
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119 int val;
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120
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121 /* main loop, select()s for all sockets in use */
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122 for(;;) {
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123
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124 timeout.tv_sec = SELECT_TIMEOUT;
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125 timeout.tv_usec = 0;
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126 FD_ZERO(&writefd);
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127 FD_ZERO(&readfd);
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128 dropbear_assert(ses.payload == NULL);
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129 if (ses.sock != -1) {
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130 FD_SET(ses.sock, &readfd);
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131 if (!isempty(&ses.writequeue)) {
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132 FD_SET(ses.sock, &writefd);
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133 }
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134 }
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135
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136 /* set up for channels which require reading/writing */
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137 if (ses.dataallowed) {
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138 setchannelfds(&readfd, &writefd);
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139 }
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140 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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141
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142 if (exitflag) {
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143 dropbear_exit("Terminated by signal");
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144 }
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145
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146 if (val < 0 && errno != EINTR) {
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147 dropbear_exit("Error in select");
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148 }
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149
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150 if (val <= 0) {
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151 /* If we were interrupted or the select timed out, we still
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152 * want to iterate over channels etc for reading, to handle
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153 * server processes exiting etc.
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154 * We don't want to read/write FDs. */
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155 FD_ZERO(&writefd);
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156 FD_ZERO(&readfd);
26
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157 }
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158
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159 /* check for auth timeout, rekeying required etc */
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160 checktimeouts();
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161
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162 /* process session socket's incoming/outgoing data */
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163 if (ses.sock != -1) {
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164 if (FD_ISSET(ses.sock, &writefd) && !isempty(&ses.writequeue)) {
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165 write_packet();
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166 }
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167
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168 if (FD_ISSET(ses.sock, &readfd)) {
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169 read_packet();
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170 }
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171
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172 /* Process the decrypted packet. After this, the read buffer
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173 * will be ready for a new packet */
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174 if (ses.payload != NULL) {
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175 process_packet();
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176 }
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177 }
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178
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179 /* process pipes etc for the channels, ses.dataallowed == 0
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180 * during rekeying ) */
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181 if (ses.dataallowed) {
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182 channelio(&readfd, &writefd);
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183 }
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184
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185 if (loophandler) {
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186 loophandler();
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187 }
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188
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189 } /* for(;;) */
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190
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191 /* Not reached */
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192 }
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193
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194 /* clean up a session on exit */
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195 void common_session_cleanup() {
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196
165
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197 TRACE(("enter session_cleanup"))
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198
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199 /* we can't cleanup if we don't know the session state */
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200 if (!sessinitdone) {
165
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201 TRACE(("leave session_cleanup: !sessinitdone"))
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202 return;
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203 }
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204
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205 m_free(ses.session_id);
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206 m_burn(ses.keys, sizeof(struct key_context));
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207 m_free(ses.keys);
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208
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209 chancleanup();
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210
165
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211 TRACE(("leave session_cleanup"))
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212 }
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213
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214
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215 void session_identification() {
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216
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217 /* max length of 255 chars */
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218 char linebuf[256];
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219 int len = 0;
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220 char done = 0;
103
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221 int i;
4
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222
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223 /* write our version string, this blocks */
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224 if (atomicio(write, ses.sock, LOCAL_IDENT "\r\n",
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225 strlen(LOCAL_IDENT "\r\n")) == DROPBEAR_FAILURE) {
344
bf29e6659fb9 Just use the normal "remote closed" handler when reading ident stings
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226 ses.remoteclosed();
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227 }
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228
275
7f9adaf85fca Exit with a message if the ssh protocol version is incompatible
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229 /* If they send more than 50 lines, something is wrong */
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230 for (i = 0; i < 50; i++) {
107
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231 len = ident_readln(ses.sock, linebuf, sizeof(linebuf));
103
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232
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233 if (len < 0 && errno != EINTR) {
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234 /* It failed */
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235 break;
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236 }
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237
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238 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) {
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239 /* start of line matches */
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240 done = 1;
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241 break;
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242 }
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243 }
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244
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245 if (!done) {
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246 TRACE(("err: %s for '%s'\n", strerror(errno), linebuf))
344
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247 ses.remoteclosed();
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248 } else {
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249 /* linebuf is already null terminated */
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250 ses.remoteident = m_malloc(len);
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251 memcpy(ses.remoteident, linebuf, len);
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252 }
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253
275
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254 /* Shall assume that 2.x will be backwards compatible. */
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255 if (strncmp(ses.remoteident, "SSH-2.", 6) != 0
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256 && strncmp(ses.remoteident, "SSH-1.99-", 9) != 0) {
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257 dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
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258 }
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259
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260 TRACE(("remoteident: %s", ses.remoteident))
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261
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262 }
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263
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264 /* returns the length including null-terminating zero on success,
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265 * or -1 on failure */
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266 static int ident_readln(int fd, char* buf, int count) {
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267
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268 char in;
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269 int pos = 0;
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270 int num = 0;
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271 fd_set fds;
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272 struct timeval timeout;
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273
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274 TRACE(("enter ident_readln"))
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275
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276 if (count < 1) {
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277 return -1;
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278 }
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279
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280 FD_ZERO(&fds);
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281
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282 /* select since it's a non-blocking fd */
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283
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284 /* leave space to null-terminate */
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285 while (pos < count-1) {
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286
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287 FD_SET(fd, &fds);
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288
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289 timeout.tv_sec = 1;
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290 timeout.tv_usec = 0;
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291 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) {
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292 if (errno == EINTR) {
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293 continue;
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294 }
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295 TRACE(("leave ident_readln: select error"))
4
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296 return -1;
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297 }
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298
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299 checktimeouts();
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300
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301 /* Have to go one byte at a time, since we don't want to read past
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302 * the end, and have to somehow shove bytes back into the normal
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303 * packet reader */
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304 if (FD_ISSET(fd, &fds)) {
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305 num = read(fd, &in, 1);
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306 /* a "\n" is a newline, "\r" we want to read in and keep going
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307 * so that it won't be read as part of the next line */
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308 if (num < 0) {
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309 /* error */
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310 if (errno == EINTR) {
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311 continue; /* not a real error */
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312 }
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313 TRACE(("leave ident_readln: read error"))
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314 return -1;
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315 }
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316 if (num == 0) {
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317 /* EOF */
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318 TRACE(("leave ident_readln: EOF"))
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319 return -1;
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320 }
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321 if (in == '\n') {
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322 /* end of ident string */
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323 break;
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324 }
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325 /* we don't want to include '\r's */
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326 if (in != '\r') {
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327 buf[pos] = in;
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328 pos++;
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329 }
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330 }
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331 }
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332
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333 buf[pos] = '\0';
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334 TRACE(("leave ident_readln: return %d", pos+1))
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335 return pos+1;
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336 }
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337
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338 /* Check all timeouts which are required. Currently these are the time for
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339 * user authentication, and the automatic rekeying. */
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340 static void checktimeouts() {
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341
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342 struct timeval tv;
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343 long secs;
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344
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345 if (gettimeofday(&tv, 0) < 0) {
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346 dropbear_exit("Error getting time");
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347 }
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348
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349 secs = tv.tv_sec;
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350
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351 if (ses.connecttimeout != 0 && secs > ses.connecttimeout) {
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352 dropbear_close("Timeout before auth");
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353 }
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354
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355 /* we can't rekey if we haven't done remote ident exchange yet */
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356 if (ses.remoteident == NULL) {
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357 return;
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358 }
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359
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360 if (!ses.kexstate.sentkexinit
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361 && (secs - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
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362 || ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)){
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363 TRACE(("rekeying after timeout or max data reached"))
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364 send_msg_kexinit();
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365 }
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366 }
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367