Mercurial > dropbear
annotate cli-session.c @ 297:79bf1023cf11 agent-client
propagate from branch 'au.asn.ucc.matt.dropbear' (head 0501e6f661b5415eb76f3b312d183c3adfbfb712)
to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 01038174ec27245b51bd43a66c01ad930880f67b)
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Tue, 21 Mar 2006 16:20:59 +0000 |
| parents | ca7e76d981d9 3be7ae2e8dfa |
| children | c1e9c81d1d27 |
| rev | line source |
|---|---|
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1 /* |
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2 * Dropbear SSH |
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3 * |
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4 * Copyright (c) 2002,2003 Matt Johnston |
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5 * Copyright (c) 2004 by Mihnea Stoenescu |
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6 * All rights reserved. |
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7 * |
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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9 * of this software and associated documentation files (the "Software"), to deal |
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10 * in the Software without restriction, including without limitation the rights |
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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12 * copies of the Software, and to permit persons to whom the Software is |
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13 * furnished to do so, subject to the following conditions: |
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14 * |
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15 * The above copyright notice and this permission notice shall be included in |
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16 * all copies or substantial portions of the Software. |
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17 * |
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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24 * SOFTWARE. */ |
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25 |
| 26 | 26 #include "includes.h" |
| 27 #include "session.h" | |
| 28 #include "dbutil.h" | |
| 29 #include "kex.h" | |
| 30 #include "ssh.h" | |
| 31 #include "packet.h" | |
| 64 | 32 #include "tcpfwd.h" |
| 26 | 33 #include "channel.h" |
| 34 #include "random.h" | |
| 33 | 35 #include "service.h" |
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36 #include "runopts.h" |
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37 #include "chansession.h" |
| 26 | 38 |
| 39 static void cli_remoteclosed(); | |
| 40 static void cli_sessionloop(); | |
| 33 | 41 static void cli_session_init(); |
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42 static void cli_finished(); |
| 26 | 43 |
| 44 struct clientsession cli_ses; /* GLOBAL */ | |
| 45 | |
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46 /* Sorted in decreasing frequency will be more efficient - data and window |
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47 * should be first */ |
| 26 | 48 static const packettype cli_packettypes[] = { |
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49 /* TYPE, FUNCTION */ |
| 26 | 50 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data}, |
| 107 | 51 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data}, |
| 26 | 52 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, |
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53 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */ |
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54 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */ |
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55 {SSH_MSG_KEXINIT, recv_msg_kexinit}, |
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56 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */ |
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57 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, |
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58 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */ |
| 26 | 59 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, |
| 60 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, | |
| 61 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, | |
| 62 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, | |
| 63 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, | |
| 64 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, | |
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65 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */ |
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66 {SSH_MSG_USERAUTH_SPECIFIC_60, recv_msg_userauth_specific_60}, /* client */ |
| 26 | 67 {0, 0} /* End */ |
| 68 }; | |
| 69 | |
| 70 static const struct ChanType *cli_chantypes[] = { | |
| 64 | 71 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 72 &cli_chan_tcpremote, | |
| 73 #endif | |
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74 #ifdef ENABLE_CLI_AGENTFWD |
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75 &cli_chan_agent, |
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76 #endif |
| 26 | 77 NULL /* Null termination */ |
| 78 }; | |
| 33 | 79 |
| 26 | 80 void cli_session(int sock, char* remotehost) { |
| 81 | |
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82 seedrandom(); |
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83 |
| 26 | 84 crypto_init(); |
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85 |
| 26 | 86 common_session_init(sock, remotehost); |
| 87 | |
| 88 chaninitialise(cli_chantypes); | |
| 89 | |
| 33 | 90 /* Set up cli_ses vars */ |
| 91 cli_session_init(); | |
| 26 | 92 |
| 93 /* Ready to go */ | |
| 94 sessinitdone = 1; | |
| 95 | |
| 96 /* Exchange identification */ | |
| 97 session_identification(); | |
| 98 | |
| 99 send_msg_kexinit(); | |
| 100 | |
| 101 session_loop(cli_sessionloop); | |
| 102 | |
| 103 /* Not reached */ | |
| 104 | |
| 33 | 105 } |
| 26 | 106 |
| 33 | 107 static void cli_session_init() { |
| 108 | |
| 109 cli_ses.state = STATE_NOTHING; | |
| 110 cli_ses.kex_state = KEX_NOTHING; | |
| 111 | |
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112 cli_ses.tty_raw_mode = 0; |
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113 cli_ses.winchange = 0; |
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114 |
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115 /* We store std{in,out,err}'s flags, so we can set them back on exit |
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116 * (otherwise busybox's ash isn't happy */ |
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117 cli_ses.stdincopy = dup(STDIN_FILENO); |
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118 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0); |
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119 cli_ses.stdoutcopy = dup(STDOUT_FILENO); |
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120 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0); |
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121 cli_ses.stderrcopy = dup(STDERR_FILENO); |
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122 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0); |
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123 |
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124 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a |
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125 specific exit status */ |
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126 |
| 47 | 127 /* Auth */ |
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128 cli_ses.lastprivkey = NULL; |
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129 cli_ses.lastauthtype = 0; |
| 47 | 130 |
| 33 | 131 /* For printing "remote host closed" for the user */ |
| 132 ses.remoteclosed = cli_remoteclosed; | |
| 133 ses.buf_match_algo = cli_buf_match_algo; | |
| 134 | |
| 135 /* packet handlers */ | |
| 136 ses.packettypes = cli_packettypes; | |
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137 |
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138 ses.isserver = 0; |
| 26 | 139 } |
| 140 | |
| 33 | 141 /* This function drives the progress of the session - it initiates KEX, |
| 142 * service, userauth and channel requests */ | |
| 26 | 143 static void cli_sessionloop() { |
| 144 | |
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145 TRACE(("enter cli_sessionloop")) |
| 33 | 146 |
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147 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
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148 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 149 } |
| 150 | |
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151 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 152 |
| 153 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 154 * negotiation would have failed. */ | |
| 155 send_msg_kexdh_init(); | |
| 156 cli_ses.kex_state = KEXDH_INIT_SENT; | |
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157 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")) |
| 33 | 158 return; |
| 159 } | |
| 160 | |
| 161 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 162 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 163 && ses.kexstate.sentkexinit == 0) { | |
| 164 cli_ses.kex_state = KEX_NOTHING; | |
| 165 } | |
| 166 | |
| 167 /* We shouldn't do anything else if a KEX is in progress */ | |
| 168 if (cli_ses.kex_state != KEX_NOTHING) { | |
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169 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")) |
| 33 | 170 return; |
| 171 } | |
| 172 | |
| 173 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 174 * in normal operation */ | |
| 175 if (ses.kexstate.donefirstkex == 0) { | |
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176 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")) |
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177 return; |
| 33 | 178 } |
| 179 | |
| 26 | 180 switch (cli_ses.state) { |
| 181 | |
| 33 | 182 case STATE_NOTHING: |
| 183 /* We've got the transport layer sorted, we now need to request | |
| 184 * userauth */ | |
| 185 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 186 cli_ses.state = SERVICE_AUTH_REQ_SENT; | |
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187 TRACE(("leave cli_sessionloop: sent userauth service req")) |
| 33 | 188 return; |
| 26 | 189 |
| 33 | 190 /* userauth code */ |
| 191 case SERVICE_AUTH_ACCEPT_RCVD: | |
| 192 cli_auth_getmethods(); | |
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193 cli_ses.state = USERAUTH_REQ_SENT; |
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194 TRACE(("leave cli_sessionloop: sent userauth methods req")) |
| 33 | 195 return; |
| 196 | |
| 197 case USERAUTH_FAIL_RCVD: | |
| 198 cli_auth_try(); | |
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199 cli_ses.state = USERAUTH_REQ_SENT; |
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200 TRACE(("leave cli_sessionloop: cli_auth_try")) |
| 33 | 201 return; |
| 202 | |
| 47 | 203 /* |
| 37 | 204 case USERAUTH_SUCCESS_RCVD: |
| 205 send_msg_service_request(SSH_SERVICE_CONNECTION); | |
| 206 cli_ses.state = SERVICE_CONN_REQ_SENT; | |
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207 TRACE(("leave cli_sessionloop: sent ssh-connection service req")) |
| 37 | 208 return; |
| 209 | |
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210 case SERVICE_CONN_ACCEPT_RCVD: |
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211 cli_send_chansess_request(); |
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212 TRACE(("leave cli_sessionloop: cli_send_chansess_request")) |
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213 cli_ses.state = SESSION_RUNNING; |
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214 return; |
| 47 | 215 */ |
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216 |
| 37 | 217 case USERAUTH_SUCCESS_RCVD: |
| 64 | 218 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 219 setup_localtcp(); | |
| 220 #endif | |
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221 #ifdef ENABLE_CLI_REMOTETCPFWD |
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222 setup_remotetcp(); |
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223 #endif |
| 37 | 224 cli_send_chansess_request(); |
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225 TRACE(("leave cli_sessionloop: cli_send_chansess_request")) |
| 37 | 226 cli_ses.state = SESSION_RUNNING; |
| 227 return; | |
| 228 | |
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229 case SESSION_RUNNING: |
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230 if (ses.chancount < 1) { |
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231 cli_finished(); |
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232 } |
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233 |
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234 if (cli_ses.winchange) { |
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235 cli_chansess_winchange(); |
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236 } |
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237 return; |
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238 |
| 33 | 239 /* XXX more here needed */ |
| 240 | |
| 241 | |
| 242 default: | |
| 243 break; | |
| 26 | 244 } |
| 245 | |
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246 TRACE(("leave cli_sessionloop: fell out")) |
| 26 | 247 |
| 248 } | |
| 249 | |
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250 void cli_session_cleanup() { |
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251 |
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252 if (!sessinitdone) { |
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253 return; |
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254 } |
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255 |
|
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256 /* Set std{in,out,err} back to non-blocking - busybox ash dies nastily if |
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257 * we don't revert the flags */ |
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100
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258 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags); |
|
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259 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags); |
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260 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags); |
|
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261 |
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262 cli_tty_cleanup(); |
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263 |
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264 } |
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265 |
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266 static void cli_finished() { |
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267 |
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268 cli_session_cleanup(); |
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269 common_session_cleanup(); |
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270 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username, |
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271 cli_opts.remotehost, cli_opts.remoteport); |
|
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272 exit(cli_ses.retval); |
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273 } |
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274 |
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275 |
| 26 | 276 /* called when the remote side closes the connection */ |
| 277 static void cli_remoteclosed() { | |
| 278 | |
| 279 /* XXX TODO perhaps print a friendlier message if we get this but have | |
| 280 * already sent/received disconnect message(s) ??? */ | |
| 281 close(ses.sock); | |
| 282 ses.sock = -1; | |
| 33 | 283 dropbear_exit("remote closed the connection"); |
| 26 | 284 } |
| 43 | 285 |
| 286 /* Operates in-place turning dirty (untrusted potentially containing control | |
|
249
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287 * characters) text into clean text. |
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288 * Note: this is safe only with ascii - other charsets could have problems. */ |
| 43 | 289 void cleantext(unsigned char* dirtytext) { |
| 290 | |
| 291 unsigned int i, j; | |
| 47 | 292 unsigned char c; |
| 43 | 293 |
| 294 j = 0; | |
| 295 for (i = 0; dirtytext[i] != '\0'; i++) { | |
| 296 | |
| 297 c = dirtytext[i]; | |
| 298 /* We can ignore '\r's */ | |
| 299 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
| 300 dirtytext[j] = c; | |
| 301 j++; | |
| 302 } | |
| 303 } | |
| 304 /* Null terminate */ | |
| 305 dirtytext[j] = '\0'; | |
| 306 } |