annotate cli-session.c @ 43:942b22d7dd1c

Banner printing
author Matt Johnston <matt@ucc.asn.au>
date Mon, 02 Aug 2004 04:25:05 +0000
parents 18eccbfb9641
children 9ee8996a375f
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1 #include "includes.h"
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2 #include "session.h"
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3 #include "dbutil.h"
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4 #include "kex.h"
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5 #include "ssh.h"
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6 #include "packet.h"
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7 #include "tcpfwd-direct.h"
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8 #include "tcpfwd-remote.h"
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9 #include "channel.h"
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10 #include "random.h"
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11 #include "service.h"
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12 #include "runopts.h"
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13 #include "chansession.h"
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15 static void cli_remoteclosed();
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16 static void cli_sessionloop();
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17 static void cli_session_init();
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18 static void cli_finished();
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20 struct clientsession cli_ses; /* GLOBAL */
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21
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22 static const packettype cli_packettypes[] = {
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23 /* TYPE, AUTHREQUIRED, FUNCTION */
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24 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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25 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, // client
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26 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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27 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, // client
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28 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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29 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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30 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp},
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31 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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32 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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33 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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34 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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35 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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36 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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37 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, // client
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38 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, // client
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39 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, // client
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40 {0, 0} /* End */
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41 };
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43 static const struct ChanType *cli_chantypes[] = {
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44 /* &chan_tcpdirect etc, though need to only allow if we've requested
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45 * that forwarding */
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46 NULL /* Null termination */
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47 };
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48
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49 void cli_session(int sock, char* remotehost) {
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50
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51 crypto_init();
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52 common_session_init(sock, remotehost);
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53
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54 chaninitialise(cli_chantypes);
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56
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57 /* Set up cli_ses vars */
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58 cli_session_init();
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59
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60 /* Ready to go */
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61 sessinitdone = 1;
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62
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63 /* Exchange identification */
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64 session_identification();
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65
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66 seedrandom();
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67
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68 send_msg_kexinit();
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69
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70 /* XXX here we do stuff differently */
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71
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72 session_loop(cli_sessionloop);
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73
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74 /* Not reached */
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75
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76 }
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77
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78 static void cli_session_init() {
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79
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80 cli_ses.state = STATE_NOTHING;
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81 cli_ses.kex_state = KEX_NOTHING;
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82
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83 cli_ses.tty_raw_mode = 0;
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84 cli_ses.winchange = 0;
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85
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86 /* For printing "remote host closed" for the user */
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87 ses.remoteclosed = cli_remoteclosed;
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88 ses.buf_match_algo = cli_buf_match_algo;
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89
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90 /* packet handlers */
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91 ses.packettypes = cli_packettypes;
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92
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93 ses.isserver = 0;
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94 }
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95
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96 /* This function drives the progress of the session - it initiates KEX,
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97 * service, userauth and channel requests */
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98 static void cli_sessionloop() {
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99
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100 TRACE(("enter cli_sessionloop"));
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101
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102 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) {
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103 cli_ses.kex_state = KEXINIT_RCVD;
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104 }
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105
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106 if (cli_ses.kex_state == KEXINIT_RCVD) {
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107
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108 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT
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109 * negotiation would have failed. */
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110 send_msg_kexdh_init();
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111 cli_ses.kex_state = KEXDH_INIT_SENT;
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112 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD"));
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113 return;
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114 }
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115
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116 /* A KEX has finished, so we should go back to our KEX_NOTHING state */
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117 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0
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118 && ses.kexstate.sentkexinit == 0) {
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119 cli_ses.kex_state = KEX_NOTHING;
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120 }
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121
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122 /* We shouldn't do anything else if a KEX is in progress */
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123 if (cli_ses.kex_state != KEX_NOTHING) {
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124 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING"));
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125 return;
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126 }
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127
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128 /* We should exit if we haven't donefirstkex: we shouldn't reach here
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129 * in normal operation */
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130 if (ses.kexstate.donefirstkex == 0) {
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131 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex"));
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132 return;
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133 }
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134
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135 switch (cli_ses.state) {
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136
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137 case STATE_NOTHING:
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138 /* We've got the transport layer sorted, we now need to request
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139 * userauth */
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140 send_msg_service_request(SSH_SERVICE_USERAUTH);
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141 cli_ses.state = SERVICE_AUTH_REQ_SENT;
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142 TRACE(("leave cli_sessionloop: sent userauth service req"));
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143 return;
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144
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145 /* userauth code */
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146 case SERVICE_AUTH_ACCEPT_RCVD:
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147 cli_auth_getmethods();
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148 cli_ses.state = USERAUTH_METHODS_SENT;
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149 TRACE(("leave cli_sessionloop: sent userauth methods req"));
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150 return;
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151
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152 case USERAUTH_FAIL_RCVD:
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153 cli_auth_try();
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154 TRACE(("leave cli_sessionloop: cli_auth_try"));
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155 return;
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156
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157 /*
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158 case USERAUTH_SUCCESS_RCVD:
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159 send_msg_service_request(SSH_SERVICE_CONNECTION);
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160 cli_ses.state = SERVICE_CONN_REQ_SENT;
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161 TRACE(("leave cli_sessionloop: sent ssh-connection service req"));
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162 return;
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163 */
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164
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165 case USERAUTH_SUCCESS_RCVD:
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166 cli_send_chansess_request();
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167 TRACE(("leave cli_sessionloop: cli_send_chansess_request"));
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168 cli_ses.state = SESSION_RUNNING;
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169 return;
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170
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171 case SESSION_RUNNING:
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172 if (ses.chancount < 1) {
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173 cli_finished();
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174 }
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175
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176 if (cli_ses.winchange) {
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177 cli_chansess_winchange();
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178 }
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179 return;
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180
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181 /* XXX more here needed */
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182
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183
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184 default:
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185 break;
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186 }
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187
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188 TRACE(("leave cli_sessionloop: fell out"));
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189
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190 }
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191
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192 void cli_session_cleanup() {
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193
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194 if (!sessinitdone) {
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195 return;
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196 }
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197 cli_tty_cleanup();
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198
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199 }
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200
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201 static void cli_finished() {
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202
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203 cli_session_cleanup();
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204 common_session_cleanup();
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205 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username,
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206 cli_opts.remotehost, cli_opts.remoteport);
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207 exit(EXIT_SUCCESS);
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208 }
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209
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210
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211
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212 /* called when the remote side closes the connection */
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213 static void cli_remoteclosed() {
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214
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215 /* XXX TODO perhaps print a friendlier message if we get this but have
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216 * already sent/received disconnect message(s) ??? */
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217 close(ses.sock);
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218 ses.sock = -1;
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219 dropbear_exit("remote closed the connection");
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220 }
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221
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222 /* Operates in-place turning dirty (untrusted potentially containing control
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223 * characters) text into clean text. */
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224 void cleantext(unsigned char* dirtytext) {
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225
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226 unsigned int i, j;
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227 unsigned char c, lastchar;
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228
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229 j = 0;
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230 for (i = 0; dirtytext[i] != '\0'; i++) {
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231
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232 c = dirtytext[i];
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233 /* We can ignore '\r's */
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234 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') {
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235 dirtytext[j] = c;
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236 j++;
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237 }
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238 }
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239 /* Null terminate */
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240 dirtytext[j] = '\0';
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241 }