Mercurial > dropbear
annotate cli-session.c @ 675:dfdb9d9189ff
Server shouldn't return "localhost" in response to -R forward connections
if that wasn't what the client requested.
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 09 May 2012 21:09:34 +0800 |
| parents | a98a2138364a |
| children | 983a817f8e41 |
| 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" |
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38 #include "agentfwd.h" |
| 26 | 39 |
| 40 static void cli_remoteclosed(); | |
| 41 static void cli_sessionloop(); | |
| 33 | 42 static void cli_session_init(); |
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43 static void cli_finished(); |
| 26 | 44 |
| 45 struct clientsession cli_ses; /* GLOBAL */ | |
| 46 | |
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47 /* Sorted in decreasing frequency will be more efficient - data and window |
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48 * should be first */ |
| 26 | 49 static const packettype cli_packettypes[] = { |
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50 /* TYPE, FUNCTION */ |
| 26 | 51 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data}, |
| 107 | 52 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data}, |
| 26 | 53 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, |
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54 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */ |
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55 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */ |
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56 {SSH_MSG_KEXINIT, recv_msg_kexinit}, |
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57 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */ |
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58 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, |
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59 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */ |
| 26 | 60 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, |
| 61 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, | |
| 62 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, | |
| 63 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, | |
| 64 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, | |
| 65 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, | |
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66 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */ |
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67 {SSH_MSG_USERAUTH_SPECIFIC_60, recv_msg_userauth_specific_60}, /* client */ |
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68 #ifdef ENABLE_CLI_REMOTETCPFWD |
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69 {SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */ |
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70 {SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */ |
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71 #endif |
| 26 | 72 {0, 0} /* End */ |
| 73 }; | |
| 74 | |
| 75 static const struct ChanType *cli_chantypes[] = { | |
| 64 | 76 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 77 &cli_chan_tcpremote, | |
| 78 #endif | |
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79 #ifdef ENABLE_CLI_AGENTFWD |
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80 &cli_chan_agent, |
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81 #endif |
| 26 | 82 NULL /* Null termination */ |
| 83 }; | |
| 33 | 84 |
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85 void cli_session(int sock_in, int sock_out) { |
| 26 | 86 |
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87 seedrandom(); |
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88 |
| 26 | 89 crypto_init(); |
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90 |
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91 common_session_init(sock_in, sock_out); |
| 26 | 92 |
| 93 chaninitialise(cli_chantypes); | |
| 94 | |
| 33 | 95 /* Set up cli_ses vars */ |
| 96 cli_session_init(); | |
| 26 | 97 |
| 98 /* Ready to go */ | |
| 99 sessinitdone = 1; | |
| 100 | |
| 101 /* Exchange identification */ | |
| 102 session_identification(); | |
| 103 | |
| 104 send_msg_kexinit(); | |
| 105 | |
| 106 session_loop(cli_sessionloop); | |
| 107 | |
| 108 /* Not reached */ | |
| 109 | |
| 33 | 110 } |
| 26 | 111 |
| 33 | 112 static void cli_session_init() { |
| 113 | |
| 114 cli_ses.state = STATE_NOTHING; | |
| 115 cli_ses.kex_state = KEX_NOTHING; | |
| 116 | |
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117 cli_ses.tty_raw_mode = 0; |
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118 cli_ses.winchange = 0; |
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119 |
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120 /* We store std{in,out,err}'s flags, so we can set them back on exit |
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121 * (otherwise busybox's ash isn't happy */ |
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122 cli_ses.stdincopy = dup(STDIN_FILENO); |
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123 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0); |
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124 cli_ses.stdoutcopy = dup(STDOUT_FILENO); |
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125 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0); |
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126 cli_ses.stderrcopy = dup(STDERR_FILENO); |
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127 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0); |
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128 |
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129 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a |
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130 specific exit status */ |
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131 |
| 47 | 132 /* Auth */ |
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133 cli_ses.lastprivkey = NULL; |
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134 cli_ses.lastauthtype = 0; |
| 47 | 135 |
| 33 | 136 /* For printing "remote host closed" for the user */ |
| 137 ses.remoteclosed = cli_remoteclosed; | |
| 138 ses.buf_match_algo = cli_buf_match_algo; | |
| 139 | |
| 140 /* packet handlers */ | |
| 141 ses.packettypes = cli_packettypes; | |
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142 |
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143 ses.isserver = 0; |
| 26 | 144 } |
| 145 | |
| 33 | 146 /* This function drives the progress of the session - it initiates KEX, |
| 147 * service, userauth and channel requests */ | |
| 26 | 148 static void cli_sessionloop() { |
| 149 | |
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150 TRACE(("enter cli_sessionloop")) |
| 33 | 151 |
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152 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
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153 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 154 } |
| 155 | |
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156 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 157 |
| 158 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 159 * negotiation would have failed. */ | |
| 160 send_msg_kexdh_init(); | |
| 161 cli_ses.kex_state = KEXDH_INIT_SENT; | |
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162 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")) |
| 33 | 163 return; |
| 164 } | |
| 165 | |
| 166 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 167 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 168 && ses.kexstate.sentkexinit == 0) { | |
| 169 cli_ses.kex_state = KEX_NOTHING; | |
| 170 } | |
| 171 | |
| 172 /* We shouldn't do anything else if a KEX is in progress */ | |
| 173 if (cli_ses.kex_state != KEX_NOTHING) { | |
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174 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")) |
| 33 | 175 return; |
| 176 } | |
| 177 | |
| 178 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 179 * in normal operation */ | |
| 180 if (ses.kexstate.donefirstkex == 0) { | |
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181 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")) |
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182 return; |
| 33 | 183 } |
| 184 | |
| 26 | 185 switch (cli_ses.state) { |
| 186 | |
| 33 | 187 case STATE_NOTHING: |
| 188 /* We've got the transport layer sorted, we now need to request | |
| 189 * userauth */ | |
| 190 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 191 cli_ses.state = SERVICE_AUTH_REQ_SENT; | |
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192 TRACE(("leave cli_sessionloop: sent userauth service req")) |
| 33 | 193 return; |
| 26 | 194 |
| 33 | 195 /* userauth code */ |
| 196 case SERVICE_AUTH_ACCEPT_RCVD: | |
| 197 cli_auth_getmethods(); | |
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198 cli_ses.state = USERAUTH_REQ_SENT; |
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199 TRACE(("leave cli_sessionloop: sent userauth methods req")) |
| 33 | 200 return; |
| 201 | |
| 202 case USERAUTH_FAIL_RCVD: | |
| 203 cli_auth_try(); | |
|
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204 cli_ses.state = USERAUTH_REQ_SENT; |
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205 TRACE(("leave cli_sessionloop: cli_auth_try")) |
| 33 | 206 return; |
| 207 | |
| 37 | 208 case USERAUTH_SUCCESS_RCVD: |
|
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209 |
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210 if (cli_opts.backgrounded) { |
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211 int devnull; |
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212 /* keeping stdin open steals input from the terminal and |
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213 is confusing, though stdout/stderr could be useful. */ |
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214 devnull = open(_PATH_DEVNULL, O_RDONLY); |
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215 if (devnull < 0) { |
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216 dropbear_exit("Opening /dev/null: %d %s", |
|
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217 errno, strerror(errno)); |
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218 } |
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219 dup2(devnull, STDIN_FILENO); |
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220 if (daemon(0, 1) < 0) { |
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221 dropbear_exit("Backgrounding failed: %d %s", |
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222 errno, strerror(errno)); |
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223 } |
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224 } |
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225 |
| 64 | 226 #ifdef ENABLE_CLI_LOCALTCPFWD |
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227 setup_localtcp(); |
| 64 | 228 #endif |
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229 #ifdef ENABLE_CLI_REMOTETCPFWD |
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230 setup_remotetcp(); |
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231 #endif |
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232 |
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233 #ifdef ENABLE_CLI_NETCAT |
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234 if (cli_opts.netcat_host) { |
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235 cli_send_netcat_request(); |
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236 } else |
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237 #endif |
| 560 | 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 |
|
175
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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) ??? */ | |
|
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297 m_close(ses.sock_in); |
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298 m_close(ses.sock_out); |
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299 ses.sock_in = -1; |
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300 ses.sock_out = -1; |
|
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301 dropbear_exit("Remote closed the connection"); |
| 26 | 302 } |
| 43 | 303 |
| 304 /* Operates in-place turning dirty (untrusted potentially containing control | |
|
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305 * characters) text into clean text. |
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306 * Note: this is safe only with ascii - other charsets could have problems. */ |
| 43 | 307 void cleantext(unsigned char* dirtytext) { |
| 308 | |
| 309 unsigned int i, j; | |
| 47 | 310 unsigned char c; |
| 43 | 311 |
| 312 j = 0; | |
| 313 for (i = 0; dirtytext[i] != '\0'; i++) { | |
| 314 | |
| 315 c = dirtytext[i]; | |
| 316 /* We can ignore '\r's */ | |
| 317 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
| 318 dirtytext[j] = c; | |
| 319 j++; | |
| 320 } | |
| 321 } | |
| 322 /* Null terminate */ | |
| 323 dirtytext[j] = '\0'; | |
| 324 } |