annotate cli-session.c @ 37:0913e2ee3545

we're nearly there yet
author Matt Johnston <matt@ucc.asn.au>
date Fri, 30 Jul 2004 03:02:19 +0000
parents 0ad5fb979f42
children 0883c0906870
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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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13 static void cli_remoteclosed();
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14 static void cli_sessionloop();
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15 static void cli_session_init();
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16
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17 struct clientsession cli_ses; /* GLOBAL */
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18
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19 static const packettype cli_packettypes[] = {
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20 /* TYPE, AUTHREQUIRED, FUNCTION */
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21 {SSH_MSG_KEXINIT, recv_msg_kexinit},
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22 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, // client
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23 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
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24 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, // client
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25 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
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26 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
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27 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp},
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28 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request},
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29 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open},
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30 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof},
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31 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close},
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32 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
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33 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
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34 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, // client
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35 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, // client
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36 {0, 0} /* End */
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37 };
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38
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39 static const struct ChanType *cli_chantypes[] = {
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40 /* &chan_tcpdirect etc, though need to only allow if we've requested
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41 * that forwarding */
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42 NULL /* Null termination */
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43 };
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44
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45 void cli_session(int sock, char* remotehost) {
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46
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47 crypto_init();
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48 common_session_init(sock, remotehost);
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49
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50 chaninitialise(cli_chantypes);
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52
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53 /* Set up cli_ses vars */
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54 cli_session_init();
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55
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56 /* Ready to go */
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57 sessinitdone = 1;
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58
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59 /* Exchange identification */
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60 session_identification();
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61
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62 seedrandom();
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63
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64 send_msg_kexinit();
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65
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66 /* XXX here we do stuff differently */
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67
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68 session_loop(cli_sessionloop);
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69
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70 /* Not reached */
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71
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72 }
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73
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74 static void cli_session_init() {
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75
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76 cli_ses.state = STATE_NOTHING;
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77 cli_ses.kex_state = KEX_NOTHING;
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78
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79 /* For printing "remote host closed" for the user */
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80 ses.remoteclosed = cli_remoteclosed;
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81 ses.buf_match_algo = cli_buf_match_algo;
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82
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83 /* packet handlers */
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84 ses.packettypes = cli_packettypes;
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85
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86 ses.isserver = 0;
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87 }
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88
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89 /* This function drives the progress of the session - it initiates KEX,
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90 * service, userauth and channel requests */
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91 static void cli_sessionloop() {
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92
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93 TRACE(("enter cli_sessionloop"));
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94
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95 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) {
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96 cli_ses.kex_state = KEXINIT_RCVD;
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97 }
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98
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99 if (cli_ses.kex_state == KEXINIT_RCVD) {
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100
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101 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT
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102 * negotiation would have failed. */
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103 send_msg_kexdh_init();
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104 cli_ses.kex_state = KEXDH_INIT_SENT;
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105 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD"));
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106 return;
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107 }
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108
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109 /* A KEX has finished, so we should go back to our KEX_NOTHING state */
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110 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0
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111 && ses.kexstate.sentkexinit == 0) {
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112 cli_ses.kex_state = KEX_NOTHING;
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113 }
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114
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115 /* We shouldn't do anything else if a KEX is in progress */
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116 if (cli_ses.kex_state != KEX_NOTHING) {
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117 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING"));
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118 return;
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119 }
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120
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121 /* We should exit if we haven't donefirstkex: we shouldn't reach here
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122 * in normal operation */
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123 if (ses.kexstate.donefirstkex == 0) {
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124 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex"));
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125 return;
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126 }
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127
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128 switch (cli_ses.state) {
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129
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130 case STATE_NOTHING:
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131 /* We've got the transport layer sorted, we now need to request
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132 * userauth */
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133 send_msg_service_request(SSH_SERVICE_USERAUTH);
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134 cli_ses.state = SERVICE_AUTH_REQ_SENT;
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135 TRACE(("leave cli_sessionloop: sent userauth service req"));
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136 return;
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137
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138 /* userauth code */
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139 case SERVICE_AUTH_ACCEPT_RCVD:
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140 cli_auth_getmethods();
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141 cli_ses.state = USERAUTH_METHODS_SENT;
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142 TRACE(("leave cli_sessionloop: sent userauth methods req"));
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143 return;
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144
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145 case USERAUTH_FAIL_RCVD:
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146 cli_auth_try();
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147 TRACE(("leave cli_sessionloop: cli_auth_try"));
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148 return;
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149
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150 /*
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151 case USERAUTH_SUCCESS_RCVD:
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152 send_msg_service_request(SSH_SERVICE_CONNECTION);
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153 cli_ses.state = SERVICE_CONN_REQ_SENT;
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154 TRACE(("leave cli_sessionloop: sent ssh-connection service req"));
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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 cli_send_chansess_request();
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160 TRACE(("leave cli_sessionloop: cli_send_chansess_request"));
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161 cli_ses.state = SESSION_RUNNING;
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162 return;
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163
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164 /* XXX more here needed */
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165
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166
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167 default:
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168 break;
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169 }
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170
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171 TRACE(("leave cli_sessionloop: fell out"));
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172
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173 }
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174
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175 /* called when the remote side closes the connection */
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176 static void cli_remoteclosed() {
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177
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178 /* XXX TODO perhaps print a friendlier message if we get this but have
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179 * already sent/received disconnect message(s) ??? */
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180 close(ses.sock);
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181 ses.sock = -1;
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182 dropbear_exit("remote closed the connection");
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183 }