Mercurial > dropbear
annotate cli-session.c @ 391:00fcf5045160
propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head c1db4398d56c56c6d06ae1e20c1e0d04dbb598ed)
to branch 'au.asn.ucc.matt.dropbear' (head d26d5eb2837f46b56a33fb0e7573aa0201abd4d5)
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 11 Jan 2007 04:29:08 +0000 |
| parents | d965110e3f5c |
| children | c216212001fc |
| 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 | |
| 26 | 74 NULL /* Null termination */ |
| 75 }; | |
| 33 | 76 |
| 26 | 77 void cli_session(int sock, char* remotehost) { |
| 78 | |
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79 seedrandom(); |
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80 |
| 26 | 81 crypto_init(); |
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82 |
| 26 | 83 common_session_init(sock, remotehost); |
| 84 | |
| 85 chaninitialise(cli_chantypes); | |
| 86 | |
| 33 | 87 /* Set up cli_ses vars */ |
| 88 cli_session_init(); | |
| 26 | 89 |
| 90 /* Ready to go */ | |
| 91 sessinitdone = 1; | |
| 92 | |
| 93 /* Exchange identification */ | |
| 94 session_identification(); | |
| 95 | |
| 96 send_msg_kexinit(); | |
| 97 | |
| 98 session_loop(cli_sessionloop); | |
| 99 | |
| 100 /* Not reached */ | |
| 101 | |
| 33 | 102 } |
| 26 | 103 |
| 33 | 104 static void cli_session_init() { |
| 105 | |
| 106 cli_ses.state = STATE_NOTHING; | |
| 107 cli_ses.kex_state = KEX_NOTHING; | |
| 108 | |
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109 cli_ses.tty_raw_mode = 0; |
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110 cli_ses.winchange = 0; |
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111 |
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112 /* We store std{in,out,err}'s flags, so we can set them back on exit |
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113 * (otherwise busybox's ash isn't happy */ |
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114 cli_ses.stdincopy = dup(STDIN_FILENO); |
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115 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0); |
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116 cli_ses.stdoutcopy = dup(STDOUT_FILENO); |
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117 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0); |
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118 cli_ses.stderrcopy = dup(STDERR_FILENO); |
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119 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0); |
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120 |
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121 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a |
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122 specific exit status */ |
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123 |
| 47 | 124 /* Auth */ |
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125 cli_ses.lastprivkey = NULL; |
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126 cli_ses.lastauthtype = 0; |
| 47 | 127 |
| 33 | 128 /* For printing "remote host closed" for the user */ |
| 129 ses.remoteclosed = cli_remoteclosed; | |
| 130 ses.buf_match_algo = cli_buf_match_algo; | |
| 131 | |
| 132 /* packet handlers */ | |
| 133 ses.packettypes = cli_packettypes; | |
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134 |
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135 ses.isserver = 0; |
| 26 | 136 } |
| 137 | |
| 33 | 138 /* This function drives the progress of the session - it initiates KEX, |
| 139 * service, userauth and channel requests */ | |
| 26 | 140 static void cli_sessionloop() { |
| 141 | |
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142 TRACE(("enter cli_sessionloop")) |
| 33 | 143 |
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144 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
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145 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 146 } |
| 147 | |
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148 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 149 |
| 150 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 151 * negotiation would have failed. */ | |
| 152 send_msg_kexdh_init(); | |
| 153 cli_ses.kex_state = KEXDH_INIT_SENT; | |
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154 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")) |
| 33 | 155 return; |
| 156 } | |
| 157 | |
| 158 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 159 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 160 && ses.kexstate.sentkexinit == 0) { | |
| 161 cli_ses.kex_state = KEX_NOTHING; | |
| 162 } | |
| 163 | |
| 164 /* We shouldn't do anything else if a KEX is in progress */ | |
| 165 if (cli_ses.kex_state != KEX_NOTHING) { | |
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166 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")) |
| 33 | 167 return; |
| 168 } | |
| 169 | |
| 170 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 171 * in normal operation */ | |
| 172 if (ses.kexstate.donefirstkex == 0) { | |
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173 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")) |
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174 return; |
| 33 | 175 } |
| 176 | |
| 26 | 177 switch (cli_ses.state) { |
| 178 | |
| 33 | 179 case STATE_NOTHING: |
| 180 /* We've got the transport layer sorted, we now need to request | |
| 181 * userauth */ | |
| 182 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 183 cli_ses.state = SERVICE_AUTH_REQ_SENT; | |
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184 TRACE(("leave cli_sessionloop: sent userauth service req")) |
| 33 | 185 return; |
| 26 | 186 |
| 33 | 187 /* userauth code */ |
| 188 case SERVICE_AUTH_ACCEPT_RCVD: | |
| 189 cli_auth_getmethods(); | |
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190 cli_ses.state = USERAUTH_REQ_SENT; |
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191 TRACE(("leave cli_sessionloop: sent userauth methods req")) |
| 33 | 192 return; |
| 193 | |
| 194 case USERAUTH_FAIL_RCVD: | |
| 195 cli_auth_try(); | |
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196 cli_ses.state = USERAUTH_REQ_SENT; |
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197 TRACE(("leave cli_sessionloop: cli_auth_try")) |
| 33 | 198 return; |
| 199 | |
| 47 | 200 /* |
| 37 | 201 case USERAUTH_SUCCESS_RCVD: |
| 202 send_msg_service_request(SSH_SERVICE_CONNECTION); | |
| 203 cli_ses.state = SERVICE_CONN_REQ_SENT; | |
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204 TRACE(("leave cli_sessionloop: sent ssh-connection service req")) |
| 37 | 205 return; |
| 206 | |
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207 case SERVICE_CONN_ACCEPT_RCVD: |
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208 cli_send_chansess_request(); |
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209 TRACE(("leave cli_sessionloop: cli_send_chansess_request")) |
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210 cli_ses.state = SESSION_RUNNING; |
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211 return; |
| 47 | 212 */ |
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213 |
| 37 | 214 case USERAUTH_SUCCESS_RCVD: |
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215 |
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216 if (cli_opts.backgrounded) { |
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217 int devnull; |
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218 // keeping stdin open steals input from the terminal and |
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219 // is confusing, though stdout/stderr could be useful. |
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220 devnull = open(_PATH_DEVNULL, O_RDONLY); |
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221 if (devnull < 0) { |
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222 dropbear_exit("opening /dev/null: %d %s", |
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223 errno, strerror(errno)); |
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224 } |
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225 dup2(devnull, STDIN_FILENO); |
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226 if (daemon(0, 1) < 0) { |
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227 dropbear_exit("Backgrounding failed: %d %s", |
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228 errno, strerror(errno)); |
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229 } |
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230 } |
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231 |
| 64 | 232 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 233 setup_localtcp(); | |
| 234 #endif | |
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235 #ifdef ENABLE_CLI_REMOTETCPFWD |
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236 setup_remotetcp(); |
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237 #endif |
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238 if (!cli_opts.no_cmd) { |
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239 cli_send_chansess_request(); |
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240 } |
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241 TRACE(("leave cli_sessionloop: running")) |
| 37 | 242 cli_ses.state = SESSION_RUNNING; |
| 243 return; | |
| 244 | |
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245 case SESSION_RUNNING: |
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246 if (ses.chancount < 1 && !cli_opts.no_cmd) { |
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247 cli_finished(); |
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248 } |
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249 |
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250 if (cli_ses.winchange) { |
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251 cli_chansess_winchange(); |
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252 } |
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253 return; |
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254 |
| 33 | 255 /* XXX more here needed */ |
| 256 | |
| 257 | |
| 258 default: | |
| 259 break; | |
| 26 | 260 } |
| 261 | |
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262 TRACE(("leave cli_sessionloop: fell out")) |
| 26 | 263 |
| 264 } | |
| 265 | |
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266 void cli_session_cleanup() { |
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267 |
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268 if (!sessinitdone) { |
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269 return; |
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270 } |
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271 |
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272 /* Set std{in,out,err} back to non-blocking - busybox ash dies nastily if |
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273 * we don't revert the flags */ |
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274 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags); |
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275 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags); |
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276 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags); |
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277 |
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278 cli_tty_cleanup(); |
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279 |
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280 } |
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281 |
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282 static void cli_finished() { |
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283 |
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284 cli_session_cleanup(); |
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285 common_session_cleanup(); |
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286 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username, |
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287 cli_opts.remotehost, cli_opts.remoteport); |
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288 exit(cli_ses.retval); |
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289 } |
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290 |
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291 |
| 26 | 292 /* called when the remote side closes the connection */ |
| 293 static void cli_remoteclosed() { | |
| 294 | |
| 295 /* XXX TODO perhaps print a friendlier message if we get this but have | |
| 296 * already sent/received disconnect message(s) ??? */ | |
| 297 close(ses.sock); | |
| 298 ses.sock = -1; | |
| 33 | 299 dropbear_exit("remote closed the connection"); |
| 26 | 300 } |
| 43 | 301 |
| 302 /* Operates in-place turning dirty (untrusted potentially containing control | |
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303 * characters) text into clean text. |
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304 * Note: this is safe only with ascii - other charsets could have problems. */ |
| 43 | 305 void cleantext(unsigned char* dirtytext) { |
| 306 | |
| 307 unsigned int i, j; | |
| 47 | 308 unsigned char c; |
| 43 | 309 |
| 310 j = 0; | |
| 311 for (i = 0; dirtytext[i] != '\0'; i++) { | |
| 312 | |
| 313 c = dirtytext[i]; | |
| 314 /* We can ignore '\r's */ | |
| 315 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
| 316 dirtytext[j] = c; | |
| 317 j++; | |
| 318 } | |
| 319 } | |
| 320 /* Null terminate */ | |
| 321 dirtytext[j] = '\0'; | |
| 322 } |