Mercurial > dropbear

annotate common-session.c @ 24:469950e86d0f

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switching to global vars
author Matt Johnston <matt@ucc.asn.au>
date Tue, 20 Jul 2004 12:05:00 +0000
parents c1e5d9195402
children 0969767bca0d
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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 struct sshsession ses; /* GLOBAL */
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39
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40 /* need to know if the session struct has been initialised, this way isn't the
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41 * cleanest, but works OK */
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42 int sessinitdone = 0; /* GLOBAL */
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43
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44 /* this is set when we get SIGINT or SIGTERM, the handler is in main.c */
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45 int exitflag = 0; /* GLOBAL */
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46
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47 static int ident_readln(int fd, char* buf, int count);
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48
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49
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50 void(*session_remoteclosed)() = NULL;
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51
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52
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53 /* called only at the start of a session, set up initial state */
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54 void common_session_init(int sock) {
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55
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56 TRACE(("enter session_init"));
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57
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58 ses.remoteaddr = NULL;
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59 ses.remotehost = NULL;
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60
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61 ses.sock = sock;
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62 ses.maxfd = sock;
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63
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64 ses.connecttimeout = 0;
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65
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66 kexinitialise(); /* initialise the kex state */
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67 chaninitialise(); /* initialise the channel state */
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68
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69 ses.writepayload = buf_new(MAX_TRANS_PAYLOAD_LEN);
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70 ses.transseq = 0;
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71
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72 ses.readbuf = NULL;
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73 ses.decryptreadbuf = NULL;
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74 ses.payload = NULL;
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75 ses.recvseq = 0;
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76
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77 ses.requirenext = SSH_MSG_KEXINIT;
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78 ses.dataallowed = 0; /* don't send data yet, we'll wait until after kex */
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79 ses.ignorenext = 0;
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80
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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.authdone = 0;
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108
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109 ses.chantypes = NULL;
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110
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111 ses.allowprivport = 0;
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112
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113
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114 TRACE(("leave session_init"));
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115 }
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116
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117 /* clean up a session on exit */
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118 void common_session_cleanup() {
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119
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120 TRACE(("enter session_cleanup"));
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121
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122 /* we can't cleanup if we don't know the session state */
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123 if (!sessinitdone) {
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124 TRACE(("leave session_cleanup: !sessinitdone"));
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125 return;
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126 }
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127
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128 m_free(ses.session_id);
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129 m_burn(ses.keys, sizeof(struct key_context));
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130 m_free(ses.keys);
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131
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132 chancleanup();
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133
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134 TRACE(("leave session_cleanup"));
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135 }
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136
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137 /* Check all timeouts which are required. Currently these are the time for
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138 * user authentication, and the automatic rekeying. */
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139 void checktimeouts() {
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140
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141 struct timeval tv;
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142 long secs;
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143
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144 if (gettimeofday(&tv, 0) < 0) {
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145 dropbear_exit("Error getting time");
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146 }
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147
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148 secs = tv.tv_sec;
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149
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150 if (ses.connecttimeout != 0 && secs > ses.connecttimeout) {
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151 dropbear_close("Timeout before auth");
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152 }
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153
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154 /* we can't rekey if we haven't done remote ident exchange yet */
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155 if (ses.remoteident == NULL) {
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156 return;
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157 }
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158
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159 if (!ses.kexstate.sentkexinit
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160 && (secs - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
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161 || ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)){
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162 TRACE(("rekeying after timeout or max data reached"));
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163 send_msg_kexinit();
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164 }
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165 }
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166 void session_identification() {
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167
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168 /* max length of 255 chars */
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169 char linebuf[256];
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170 int len = 0;
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171 char done = 0;
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172
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173 /* write our version string, this blocks */
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174 if (atomicio(write, ses.sock, LOCAL_IDENT "\r\n",
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175 strlen(LOCAL_IDENT "\r\n")) == DROPBEAR_FAILURE) {
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176 dropbear_exit("Error writing ident string");
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177 }
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178
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179 len = ident_readln(ses.sock, linebuf, 256);
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180 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) {
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181 /* start of line matches */
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182 done = 1;
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183 }
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184
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185 if (!done) {
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186 dropbear_exit("Failed to get client version");
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187 } else {
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188 /* linebuf is already null terminated */
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189 ses.remoteident = m_malloc(len);
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190 memcpy(ses.remoteident, linebuf, len);
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191 }
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192
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193 TRACE(("remoteident: %s", ses.remoteident));
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194
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195 }
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196
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197 /* returns the length including null-terminating zero on success,
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198 * or -1 on failure */
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199 static int ident_readln(int fd, char* buf, int count) {
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200
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201 char in;
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202 int pos = 0;
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203 int num = 0;
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204 fd_set fds;
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205 struct timeval timeout;
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206
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207 TRACE(("enter ident_readln"));
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208
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209 if (count < 1) {
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210 return -1;
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211 }
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212
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213 FD_ZERO(&fds);
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214
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215 /* select since it's a non-blocking fd */
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216
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217 /* leave space to null-terminate */
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218 while (pos < count-1) {
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219
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220 FD_SET(fd, &fds);
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221
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222 timeout.tv_sec = 1;
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223 timeout.tv_usec = 0;
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224 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) {
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225 if (errno == EINTR) {
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226 continue;
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227 }
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228 TRACE(("leave ident_readln: select error"));
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229 return -1;
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230 }
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231
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232 checktimeouts();
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233
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234 /* Have to go one byte at a time, since we don't want to read past
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235 * the end, and have to somehow shove bytes back into the normal
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236 * packet reader */
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237 if (FD_ISSET(fd, &fds)) {
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238 num = read(fd, &in, 1);
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239 /* a "\n" is a newline, "\r" we want to read in and keep going
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240 * so that it won't be read as part of the next line */
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241 if (num < 0) {
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242 /* error */
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243 if (errno == EINTR) {
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244 continue; /* not a real error */
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245 }
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246 TRACE(("leave ident_readln: read error"));
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247 return -1;
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248 }
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249 if (num == 0) {
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250 /* EOF */
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251 TRACE(("leave ident_readln: EOF"));
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252 return -1;
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253 }
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254 if (in == '\n') {
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255 /* end of ident string */
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256 break;
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257 }
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258 /* we don't want to include '\r's */
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259 if (in != '\r') {
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260 buf[pos] = in;
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261 pos++;
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262 }
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263 }
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264 }
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265
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266 buf[pos] = '\0';
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267 TRACE(("leave ident_readln: return %d", pos+1));
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268 return pos+1;
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269 }
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270