Mercurial > dropbear

annotate common-session.c @ 21:d7cc5b484a2e

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- Port restriction code back in - Remove bad strerror() logging
author Matt Johnston <matt@ucc.asn.au>
date Tue, 22 Jun 2004 10:47:16 +0000
parents ab00ef513e97
children c1e5d9195402
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 "atomicio.h"
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37
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38 struct sshsession ses;
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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;
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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;
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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, runopts *opts) {
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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.opts = opts;
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65
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66 ses.connecttimeout = 0;
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67
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68 kexinitialise(); /* initialise the kex state */
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69 chaninitialise(); /* initialise the channel state */
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70
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71 ses.writepayload = buf_new(MAX_TRANS_PAYLOAD_LEN);
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72 ses.transseq = 0;
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73
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74 ses.readbuf = NULL;
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75 ses.decryptreadbuf = NULL;
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76 ses.payload = NULL;
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77 ses.recvseq = 0;
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78
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79 ses.expecting = SSH_MSG_KEXINIT;
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80 ses.dataallowed = 0; /* don't send data yet, we'll wait until after kex */
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81 ses.ignorenext = 0;
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82
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83 /* set all the algos to none */
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84 ses.keys = (struct key_context*)m_malloc(sizeof(struct key_context));
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85 ses.newkeys = NULL;
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86 ses.keys->recv_algo_crypt = &dropbear_nocipher;
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87 ses.keys->trans_algo_crypt = &dropbear_nocipher;
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88
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89 ses.keys->recv_algo_mac = &dropbear_nohash;
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90 ses.keys->trans_algo_mac = &dropbear_nohash;
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91
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92 ses.keys->algo_kex = -1;
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93 ses.keys->algo_hostkey = -1;
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94 ses.keys->recv_algo_comp = DROPBEAR_COMP_NONE;
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95 ses.keys->trans_algo_comp = DROPBEAR_COMP_NONE;
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96
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97 #ifndef DISABLE_ZLIB
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98 ses.keys->recv_zstream = NULL;
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99 ses.keys->trans_zstream = NULL;
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100 #endif
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101
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102 /* key exchange buffers */
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103 ses.session_id = NULL;
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104 ses.kexhashbuf = NULL;
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105 ses.transkexinit = NULL;
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106 ses.dh_K = NULL;
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107 ses.remoteident = NULL;
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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 freerunopts(ses.opts);
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130 m_burn(ses.keys, sizeof(struct key_context));
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131 m_free(ses.keys);
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132
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133 chancleanup();
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134
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135 TRACE(("leave session_cleanup"));
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136 }
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137
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138 /* Check all timeouts which are required. Currently these are the time for
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139 * user authentication, and the automatic rekeying. */
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140 void checktimeouts() {
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141
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142 struct timeval tv;
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143 long secs;
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144
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145 if (gettimeofday(&tv, 0) < 0) {
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146 dropbear_exit("Error getting time");
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147 }
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148
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149 secs = tv.tv_sec;
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150
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151 if (ses.connecttimeout != 0 && secs > ses.connecttimeout) {
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152 dropbear_close("Timeout before auth");
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153 }
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154
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155 /* we can't rekey if we haven't done remote ident exchange yet */
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156 if (ses.remoteident == NULL) {
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157 return;
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158 }
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159
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160 if (!ses.kexstate.sentkexinit
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161 && (secs - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
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162 || ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)){
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163 TRACE(("rekeying after timeout or max data reached"));
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164 send_msg_kexinit();
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165 }
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166 }
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167 void session_identification() {
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168
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169 /* max length of 255 chars */
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170 char linebuf[256];
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171 int len = 0;
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172 char done = 0;
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173
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174 /* write our version string, this blocks */
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175 if (atomicio(write, ses.sock, LOCAL_IDENT "\r\n",
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176 strlen(LOCAL_IDENT "\r\n")) == DROPBEAR_FAILURE) {
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177 dropbear_exit("Error writing ident string");
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178 }
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179
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180 len = ident_readln(ses.sock, linebuf, 256);
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181 if (len >= 4 && memcmp(linebuf, "SSH-", 4) == 0) {
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182 /* start of line matches */
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183 done = 1;
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184 }
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185
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186 if (!done) {
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187 dropbear_exit("Failed to get client version");
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188 } else {
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189 /* linebuf is already null terminated */
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190 ses.remoteident = m_malloc(len);
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191 memcpy(ses.remoteident, linebuf, len);
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192 }
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193
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194 TRACE(("remoteident: %s", ses.remoteident));
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195
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196 }
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197
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198 /* returns the length including null-terminating zero on success,
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199 * or -1 on failure */
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200 static int ident_readln(int fd, char* buf, int count) {
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201
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202 char in;
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203 int pos = 0;
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204 int num = 0;
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205 fd_set fds;
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206 struct timeval timeout;
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207
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208 TRACE(("enter ident_readln"));
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209
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210 if (count < 1) {
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211 return -1;
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212 }
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213
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214 FD_ZERO(&fds);
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215
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216 /* select since it's a non-blocking fd */
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217
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218 /* leave space to null-terminate */
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219 while (pos < count-1) {
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220
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221 FD_SET(fd, &fds);
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222
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223 timeout.tv_sec = 1;
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224 timeout.tv_usec = 0;
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225 if (select(fd+1, &fds, NULL, NULL, &timeout) < 0) {
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226 if (errno == EINTR) {
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227 continue;
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228 }
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229 TRACE(("leave ident_readln: select error"));
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230 return -1;
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231 }
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232
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233 checktimeouts();
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234
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235 /* Have to go one byte at a time, since we don't want to read past
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236 * the end, and have to somehow shove bytes back into the normal
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237 * packet reader */
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238 if (FD_ISSET(fd, &fds)) {
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239 num = read(fd, &in, 1);
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240 /* a "\n" is a newline, "\r" we want to read in and keep going
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241 * so that it won't be read as part of the next line */
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242 if (num < 0) {
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243 /* error */
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244 if (errno == EINTR) {
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245 continue; /* not a real error */
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246 }
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247 TRACE(("leave ident_readln: read error"));
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248 return -1;
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249 }
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250 if (num == 0) {
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251 /* EOF */
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252 TRACE(("leave ident_readln: EOF"));
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253 return -1;
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254 }
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255 if (in == '\n') {
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256 /* end of ident string */
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257 break;
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258 }
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259 /* we don't want to include '\r's */
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260 if (in != '\r') {
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261 buf[pos] = in;
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262 pos++;
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263 }
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264 }
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265 }
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266
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267 buf[pos] = '\0';
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268 TRACE(("leave ident_readln: return %d", pos+1));
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269 return pos+1;
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270 }
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271