Mercurial > dropbear

annotate common-session.c @ 33:f789045062e6

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Progressing client support
author Matt Johnston <matt@ucc.asn.au>
date Tue, 27 Jul 2004 16:30:46 +0000
parents 0969767bca0d
children e2a1eaa19f22
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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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38
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39 struct sshsession ses; /* GLOBAL */
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41 /* need to know if the session struct has been initialised, this way isn't the
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42 * cleanest, but works OK */
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43 int sessinitdone = 0; /* GLOBAL */
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45 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */
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46 int exitflag = 0; /* GLOBAL */
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49 static void checktimeouts();
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50 static int ident_readln(int fd, char* buf, int count);
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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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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 chaninitialise(); /* initialise the channel state */
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66
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67 ses.writepayload = buf_new(MAX_TRANS_PAYLOAD_LEN);
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68 ses.transseq = 0;
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69
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70 ses.readbuf = NULL;
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71 ses.decryptreadbuf = NULL;
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72 ses.payload = NULL;
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73 ses.recvseq = 0;
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74
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75 ses.requirenext = SSH_MSG_KEXINIT;
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76 ses.dataallowed = 0; /* don't send data yet, we'll wait until after kex */
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77 ses.ignorenext = 0;
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79 /* set all the algos to none */
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80 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
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81 ses.newkeys = NULL;
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82 ses.keys->recv_algo_crypt = &dropbear_nocipher;
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83 ses.keys->trans_algo_crypt = &dropbear_nocipher;
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84
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85 ses.keys->recv_algo_mac = &dropbear_nohash;
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86 ses.keys->trans_algo_mac = &dropbear_nohash;
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87
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88 ses.keys->algo_kex = -1;
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89 ses.keys->algo_hostkey = -1;
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90 ses.keys->recv_algo_comp = DROPBEAR_COMP_NONE;
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91 ses.keys->trans_algo_comp = DROPBEAR_COMP_NONE;
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92
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93 #ifndef DISABLE_ZLIB
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94 ses.keys->recv_zstream = NULL;
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95 ses.keys->trans_zstream = NULL;
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96 #endif
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97
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98 /* key exchange buffers */
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99 ses.session_id = NULL;
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100 ses.kexhashbuf = NULL;
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101 ses.transkexinit = NULL;
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102 ses.dh_K = NULL;
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103 ses.remoteident = NULL;
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104
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105 ses.chantypes = NULL;
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106
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107 ses.allowprivport = 0;
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108
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109
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110 TRACE(("leave session_init"));
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111 }
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112
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113 void session_loop(void(*loophandler)()) {
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114
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115 fd_set readfd, writefd;
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116 struct timeval timeout;
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117 int val;
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118
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119 /* main loop, select()s for all sockets in use */
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120 for(;;) {
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121
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122 timeout.tv_sec = SELECT_TIMEOUT;
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123 timeout.tv_usec = 0;
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124 FD_ZERO(&writefd);
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125 FD_ZERO(&readfd);
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126 assert(ses.payload == NULL);
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127 if (ses.sock != -1) {
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128 FD_SET(ses.sock, &readfd);
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129 if (!isempty(&ses.writequeue)) {
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130 FD_SET(ses.sock, &writefd);
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131 }
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132 }
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133
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134 /* set up for channels which require reading/writing */
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135 if (ses.dataallowed) {
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136 setchannelfds(&readfd, &writefd);
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137 }
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138 val = select(ses.maxfd+1, &readfd, &writefd, NULL, &timeout);
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139
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140 if (exitflag) {
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141 dropbear_exit("Terminated by signal");
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142 }
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143
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144 if (val < 0) {
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145 if (errno == EINTR) {
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146 continue;
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147 } else {
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148 dropbear_exit("Error in select");
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149 }
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150 }
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151
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152 /* check for auth timeout, rekeying required etc */
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153 checktimeouts();
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154
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155 if (val == 0) {
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156 /* timeout */
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157 TRACE(("select timeout"));
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158 continue;
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159 }
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160
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161 /* process session socket's incoming/outgoing data */
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162 if (ses.sock != -1) {
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163 if (FD_ISSET(ses.sock, &writefd) && !isempty(&ses.writequeue)) {
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164 write_packet();
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165 }
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166
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167 if (FD_ISSET(ses.sock, &readfd)) {
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168 read_packet();
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169 }
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170
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171 /* Process the decrypted packet. After this, the read buffer
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172 * will be ready for a new packet */
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173 if (ses.payload != NULL) {
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174 process_packet();
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175 }
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176 }
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177
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178 /* process pipes etc for the channels, ses.dataallowed == 0
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179 * during rekeying ) */
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180 if (ses.dataallowed) {
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181 channelio(&readfd, &writefd);
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182 }
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183
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184 if (loophandler) {
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185 loophandler();
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186 }
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187
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188 } /* for(;;) */
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189
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190 /* Not reached */
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191 }
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192
4
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193 /* clean up a session on exit */
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194 void common_session_cleanup() {
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195
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196 TRACE(("enter session_cleanup"));
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197
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198 /* we can't cleanup if we don't know the session state */
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199 if (!sessinitdone) {
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200 TRACE(("leave session_cleanup: !sessinitdone"));
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201 return;
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202 }
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203
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204 m_free(ses.session_id);
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205 m_burn(ses.keys, sizeof(struct key_context));
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206 m_free(ses.keys);
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207
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208 chancleanup();
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209
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210 TRACE(("leave session_cleanup"));
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211 }
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212
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213
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214 void session_identification() {
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215
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216 /* max length of 255 chars */
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217 char linebuf[256];
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218 int len = 0;
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219 char done = 0;
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220
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221 /* write our version string, this blocks */
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222 if (atomicio(write, ses.sock, LOCAL_IDENT "\r\n",
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223 strlen(LOCAL_IDENT "\r\n")) == DROPBEAR_FAILURE) {
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224 dropbear_exit("Error writing ident string");
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225 }
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226
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227 len = ident_readln(ses.sock, linebuf, 256);
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228 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) {
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229 /* start of line matches */
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230 done = 1;
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231 }
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232
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233 if (!done) {
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234 dropbear_exit("Failed to get client version");
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235 } else {
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236 /* linebuf is already null terminated */
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237 ses.remoteident = m_malloc(len);
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238 memcpy(ses.remoteident, linebuf, len);
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239 }
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240
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241 TRACE(("remoteident: %s", ses.remoteident));
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242
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243 }
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244
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245 /* returns the length including null-terminating zero on success,
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246 * or -1 on failure */
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247 static int ident_readln(int fd, char* buf, int count) {
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248
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249 char in;
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250 int pos = 0;
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251 int num = 0;
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252 fd_set fds;
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253 struct timeval timeout;
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254
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255 TRACE(("enter ident_readln"));
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256
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257 if (count < 1) {
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258 return -1;
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259 }
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260
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261 FD_ZERO(&fds);
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262
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263 /* select since it's a non-blocking fd */
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264
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265 /* leave space to null-terminate */
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266 while (pos < count-1) {
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267
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268 FD_SET(fd, &fds);
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269
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270 timeout.tv_sec = 1;
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271 timeout.tv_usec = 0;
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272 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) {
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273 if (errno == EINTR) {
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274 continue;
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275 }
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276 TRACE(("leave ident_readln: select error"));
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277 return -1;
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278 }
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279
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280 checktimeouts();
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281
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282 /* Have to go one byte at a time, since we don't want to read past
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283 * the end, and have to somehow shove bytes back into the normal
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284 * packet reader */
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285 if (FD_ISSET(fd, &fds)) {
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286 num = read(fd, &in, 1);
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287 /* a "\n" is a newline, "\r" we want to read in and keep going
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288 * so that it won't be read as part of the next line */
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289 if (num < 0) {
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290 /* error */
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291 if (errno == EINTR) {
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292 continue; /* not a real error */
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293 }
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294 TRACE(("leave ident_readln: read error"));
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295 return -1;
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296 }
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297 if (num == 0) {
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298 /* EOF */
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299 TRACE(("leave ident_readln: EOF"));
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300 return -1;
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301 }
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302 if (in == '\n') {
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303 /* end of ident string */
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304 break;
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305 }
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306 /* we don't want to include '\r's */
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307 if (in != '\r') {
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308 buf[pos] = in;
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309 pos++;
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310 }
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311 }
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312 }
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313
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314 buf[pos] = '\0';
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315 TRACE(("leave ident_readln: return %d", pos+1));
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316 return pos+1;
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317 }
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318
26
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319 /* Check all timeouts which are required. Currently these are the time for
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320 * user authentication, and the automatic rekeying. */
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321 static void checktimeouts() {
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322
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323 struct timeval tv;
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324 long secs;
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325
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326 if (gettimeofday(&tv, 0) < 0) {
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327 dropbear_exit("Error getting time");
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328 }
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329
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330 secs = tv.tv_sec;
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331
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332 if (ses.connecttimeout != 0 && secs > ses.connecttimeout) {
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333 dropbear_close("Timeout before auth");
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334 }
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335
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336 /* we can't rekey if we haven't done remote ident exchange yet */
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337 if (ses.remoteident == NULL) {
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338 return;
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339 }
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340
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341 if (!ses.kexstate.sentkexinit
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342 && (secs - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
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343 || ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)){
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344 TRACE(("rekeying after timeout or max data reached"));
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345 send_msg_kexinit();
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346 }
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347 }
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348