Mercurial > dropbear
annotate cli-session.c @ 546:568638be7203 agent-client
propagate from branch 'au.asn.ucc.matt.dropbear' (head 899a8851a5edf840b2f7925bcc26ffe99dcac54d)
to branch 'au.asn.ucc.matt.dropbear.cli-agent' (head 6bbab8364de17bd9ecb1dee5ffb796e48c0380d2)
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 01 Jul 2009 04:16:32 +0000 |
| parents | d588e3ea557a 805e557fdff7 |
| children | cf376c696dfc |
| 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 */ |
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67 #ifdef ENABLE_CLI_REMOTETCPFWD |
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68 {SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */ |
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69 {SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */ |
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70 #endif |
| 26 | 71 {0, 0} /* End */ |
| 72 }; | |
| 73 | |
| 74 static const struct ChanType *cli_chantypes[] = { | |
| 64 | 75 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 76 &cli_chan_tcpremote, | |
| 77 #endif | |
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78 #ifdef ENABLE_CLI_AGENTFWD |
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79 &cli_chan_agent, |
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80 #endif |
| 26 | 81 NULL /* Null termination */ |
| 82 }; | |
| 33 | 83 |
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84 void cli_session(int sock_in, int sock_out, char* remotehost) { |
| 26 | 85 |
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86 seedrandom(); |
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87 |
| 26 | 88 crypto_init(); |
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89 |
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90 common_session_init(sock_in, sock_out, remotehost); |
| 26 | 91 |
| 92 chaninitialise(cli_chantypes); | |
| 93 | |
| 33 | 94 /* Set up cli_ses vars */ |
| 95 cli_session_init(); | |
| 26 | 96 |
| 97 /* Ready to go */ | |
| 98 sessinitdone = 1; | |
| 99 | |
| 100 /* Exchange identification */ | |
| 101 session_identification(); | |
| 102 | |
| 103 send_msg_kexinit(); | |
| 104 | |
| 105 session_loop(cli_sessionloop); | |
| 106 | |
| 107 /* Not reached */ | |
| 108 | |
| 33 | 109 } |
| 26 | 110 |
| 33 | 111 static void cli_session_init() { |
| 112 | |
| 113 cli_ses.state = STATE_NOTHING; | |
| 114 cli_ses.kex_state = KEX_NOTHING; | |
| 115 | |
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116 cli_ses.tty_raw_mode = 0; |
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117 cli_ses.winchange = 0; |
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118 |
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119 /* We store std{in,out,err}'s flags, so we can set them back on exit |
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120 * (otherwise busybox's ash isn't happy */ |
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121 cli_ses.stdincopy = dup(STDIN_FILENO); |
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122 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0); |
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123 cli_ses.stdoutcopy = dup(STDOUT_FILENO); |
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124 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0); |
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125 cli_ses.stderrcopy = dup(STDERR_FILENO); |
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126 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0); |
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127 |
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128 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a |
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129 specific exit status */ |
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130 |
| 47 | 131 /* Auth */ |
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132 cli_ses.lastprivkey = NULL; |
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133 cli_ses.lastauthtype = 0; |
| 47 | 134 |
| 33 | 135 /* For printing "remote host closed" for the user */ |
| 136 ses.remoteclosed = cli_remoteclosed; | |
| 137 ses.buf_match_algo = cli_buf_match_algo; | |
| 138 | |
| 139 /* packet handlers */ | |
| 140 ses.packettypes = cli_packettypes; | |
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141 |
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142 ses.isserver = 0; |
| 26 | 143 } |
| 144 | |
| 33 | 145 /* This function drives the progress of the session - it initiates KEX, |
| 146 * service, userauth and channel requests */ | |
| 26 | 147 static void cli_sessionloop() { |
| 148 | |
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149 TRACE(("enter cli_sessionloop")) |
| 33 | 150 |
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151 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
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152 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 153 } |
| 154 | |
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155 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 156 |
| 157 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 158 * negotiation would have failed. */ | |
| 159 send_msg_kexdh_init(); | |
| 160 cli_ses.kex_state = KEXDH_INIT_SENT; | |
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161 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")) |
| 33 | 162 return; |
| 163 } | |
| 164 | |
| 165 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 166 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 167 && ses.kexstate.sentkexinit == 0) { | |
| 168 cli_ses.kex_state = KEX_NOTHING; | |
| 169 } | |
| 170 | |
| 171 /* We shouldn't do anything else if a KEX is in progress */ | |
| 172 if (cli_ses.kex_state != KEX_NOTHING) { | |
|
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173 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")) |
| 33 | 174 return; |
| 175 } | |
| 176 | |
| 177 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 178 * in normal operation */ | |
| 179 if (ses.kexstate.donefirstkex == 0) { | |
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180 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")) |
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181 return; |
| 33 | 182 } |
| 183 | |
| 26 | 184 switch (cli_ses.state) { |
| 185 | |
| 33 | 186 case STATE_NOTHING: |
| 187 /* We've got the transport layer sorted, we now need to request | |
| 188 * userauth */ | |
| 189 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 190 cli_ses.state = SERVICE_AUTH_REQ_SENT; | |
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191 TRACE(("leave cli_sessionloop: sent userauth service req")) |
| 33 | 192 return; |
| 26 | 193 |
| 33 | 194 /* userauth code */ |
| 195 case SERVICE_AUTH_ACCEPT_RCVD: | |
| 196 cli_auth_getmethods(); | |
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197 cli_ses.state = USERAUTH_REQ_SENT; |
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198 TRACE(("leave cli_sessionloop: sent userauth methods req")) |
| 33 | 199 return; |
| 200 | |
| 201 case USERAUTH_FAIL_RCVD: | |
| 202 cli_auth_try(); | |
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203 cli_ses.state = USERAUTH_REQ_SENT; |
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204 TRACE(("leave cli_sessionloop: cli_auth_try")) |
| 33 | 205 return; |
| 206 | |
| 37 | 207 case USERAUTH_SUCCESS_RCVD: |
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208 |
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209 if (cli_opts.backgrounded) { |
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210 int devnull; |
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211 /* keeping stdin open steals input from the terminal and |
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212 is confusing, though stdout/stderr could be useful. */ |
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213 devnull = open(_PATH_DEVNULL, O_RDONLY); |
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214 if (devnull < 0) { |
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215 dropbear_exit("opening /dev/null: %d %s", |
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216 errno, strerror(errno)); |
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217 } |
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218 dup2(devnull, STDIN_FILENO); |
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219 if (daemon(0, 1) < 0) { |
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220 dropbear_exit("Backgrounding failed: %d %s", |
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221 errno, strerror(errno)); |
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222 } |
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223 } |
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224 |
| 64 | 225 #ifdef ENABLE_CLI_LOCALTCPFWD |
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226 setup_localtcp(); |
| 64 | 227 #endif |
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228 #ifdef ENABLE_CLI_REMOTETCPFWD |
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229 setup_remotetcp(); |
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230 #endif |
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231 |
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232 #ifdef ENABLE_CLI_NETCAT |
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233 if (cli_opts.netcat_host) { |
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234 cli_send_netcat_request(); |
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235 } else |
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236 #endif |
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237 if (!cli_opts.no_cmd) { |
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238 cli_send_chansess_request(); |
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239 } |
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240 TRACE(("leave cli_sessionloop: running")) |
| 37 | 241 cli_ses.state = SESSION_RUNNING; |
| 242 return; | |
| 243 | |
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244 case SESSION_RUNNING: |
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245 if (ses.chancount < 1 && !cli_opts.no_cmd) { |
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246 cli_finished(); |
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247 } |
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248 |
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249 if (cli_ses.winchange) { |
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250 cli_chansess_winchange(); |
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251 } |
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252 return; |
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253 |
| 33 | 254 /* XXX more here needed */ |
| 255 | |
| 256 | |
| 257 default: | |
| 258 break; | |
| 26 | 259 } |
| 260 | |
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261 TRACE(("leave cli_sessionloop: fell out")) |
| 26 | 262 |
| 263 } | |
| 264 | |
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265 void cli_session_cleanup() { |
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266 |
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267 if (!sessinitdone) { |
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268 return; |
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269 } |
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270 |
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271 /* Set std{in,out,err} back to non-blocking - busybox ash dies nastily if |
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272 * we don't revert the flags */ |
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273 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags); |
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274 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags); |
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275 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags); |
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276 |
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277 cli_tty_cleanup(); |
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278 |
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279 } |
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280 |
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281 static void cli_finished() { |
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282 |
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283 cli_session_cleanup(); |
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284 common_session_cleanup(); |
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285 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username, |
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286 cli_opts.remotehost, cli_opts.remoteport); |
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287 exit(cli_ses.retval); |
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288 } |
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289 |
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290 |
| 26 | 291 /* called when the remote side closes the connection */ |
| 292 static void cli_remoteclosed() { | |
| 293 | |
| 294 /* XXX TODO perhaps print a friendlier message if we get this but have | |
| 295 * already sent/received disconnect message(s) ??? */ | |
|
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296 m_close(ses.sock_in); |
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297 m_close(ses.sock_out); |
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298 ses.sock_in = -1; |
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299 ses.sock_out = -1; |
| 33 | 300 dropbear_exit("remote closed the connection"); |
| 26 | 301 } |
| 43 | 302 |
| 303 /* Operates in-place turning dirty (untrusted potentially containing control | |
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304 * characters) text into clean text. |
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305 * Note: this is safe only with ascii - other charsets could have problems. */ |
| 43 | 306 void cleantext(unsigned char* dirtytext) { |
| 307 | |
| 308 unsigned int i, j; | |
| 47 | 309 unsigned char c; |
| 43 | 310 |
| 311 j = 0; | |
| 312 for (i = 0; dirtytext[i] != '\0'; i++) { | |
| 313 | |
| 314 c = dirtytext[i]; | |
| 315 /* We can ignore '\r's */ | |
| 316 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
| 317 dirtytext[j] = c; | |
| 318 j++; | |
| 319 } | |
| 320 } | |
| 321 /* Null terminate */ | |
| 322 dirtytext[j] = '\0'; | |
| 323 } |