Mercurial > dropbear
annotate cli-session.c @ 102:6571b480fa04
merge of 5c31199418631253a3d311fe3b1ff87351e1c9ca
and c84edf4a78416c5c3172871d3c74d7fd64afab2d
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Tue, 24 Aug 2004 04:07:41 +0000 |
| parents | c72f5c10125d |
| children | d3eb1fa8484e |
| 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}, |
| 51 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, | |
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52 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */ |
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53 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */ |
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54 {SSH_MSG_KEXINIT, recv_msg_kexinit}, |
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55 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */ |
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56 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, |
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57 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */ |
| 26 | 58 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, |
| 59 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, | |
| 60 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, | |
| 61 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, | |
| 62 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, | |
| 63 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, | |
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64 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */ |
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65 #ifdef ENABLE_CLI_PUBKEY_AUTH |
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66 {SSH_MSG_USERAUTH_PK_OK, recv_msg_userauth_pk_ok}, /* client */ |
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67 #endif |
| 26 | 68 {0, 0} /* End */ |
| 69 }; | |
| 70 | |
| 71 static const struct ChanType *cli_chantypes[] = { | |
| 64 | 72 #ifdef ENABLE_CLI_REMOTETCPFWD |
| 73 &cli_chan_tcpremote, | |
| 74 #endif | |
| 26 | 75 NULL /* Null termination */ |
| 76 }; | |
| 33 | 77 |
| 26 | 78 void cli_session(int sock, char* remotehost) { |
| 79 | |
| 80 crypto_init(); | |
| 81 common_session_init(sock, remotehost); | |
| 82 | |
| 83 chaninitialise(cli_chantypes); | |
| 84 | |
| 85 | |
| 33 | 86 /* Set up cli_ses vars */ |
| 87 cli_session_init(); | |
| 26 | 88 |
| 89 /* Ready to go */ | |
| 90 sessinitdone = 1; | |
| 91 | |
| 92 /* Exchange identification */ | |
| 93 session_identification(); | |
| 94 | |
| 95 seedrandom(); | |
| 96 | |
| 97 send_msg_kexinit(); | |
| 98 | |
| 99 /* XXX here we do stuff differently */ | |
| 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 stdin's flags, so we can set them back on exit (otherwise |
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116 * 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 |
| 47 | 120 /* Auth */ |
| 121 cli_ses.lastpubkey = NULL; | |
| 122 cli_ses.lastauthtype = NULL; | |
| 123 | |
| 33 | 124 /* For printing "remote host closed" for the user */ |
| 125 ses.remoteclosed = cli_remoteclosed; | |
| 126 ses.buf_match_algo = cli_buf_match_algo; | |
| 127 | |
| 128 /* packet handlers */ | |
| 129 ses.packettypes = cli_packettypes; | |
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130 |
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131 ses.isserver = 0; |
| 26 | 132 } |
| 133 | |
| 33 | 134 /* This function drives the progress of the session - it initiates KEX, |
| 135 * service, userauth and channel requests */ | |
| 26 | 136 static void cli_sessionloop() { |
| 137 | |
| 33 | 138 TRACE(("enter cli_sessionloop")); |
| 139 | |
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140 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
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141 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 142 } |
| 143 | |
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144 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 145 |
| 146 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 147 * negotiation would have failed. */ | |
| 148 send_msg_kexdh_init(); | |
| 149 cli_ses.kex_state = KEXDH_INIT_SENT; | |
| 150 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")); | |
| 151 return; | |
| 152 } | |
| 153 | |
| 154 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 155 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 156 && ses.kexstate.sentkexinit == 0) { | |
| 157 cli_ses.kex_state = KEX_NOTHING; | |
| 158 } | |
| 159 | |
| 160 /* We shouldn't do anything else if a KEX is in progress */ | |
| 161 if (cli_ses.kex_state != KEX_NOTHING) { | |
| 162 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")); | |
| 163 return; | |
| 164 } | |
| 165 | |
| 166 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 167 * in normal operation */ | |
| 168 if (ses.kexstate.donefirstkex == 0) { | |
| 169 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")); | |
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170 return; |
| 33 | 171 } |
| 172 | |
| 26 | 173 switch (cli_ses.state) { |
| 174 | |
| 33 | 175 case STATE_NOTHING: |
| 176 /* We've got the transport layer sorted, we now need to request | |
| 177 * userauth */ | |
| 178 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 179 cli_ses.state = SERVICE_AUTH_REQ_SENT; | |
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180 TRACE(("leave cli_sessionloop: sent userauth service req")); |
| 33 | 181 return; |
| 26 | 182 |
| 33 | 183 /* userauth code */ |
| 184 case SERVICE_AUTH_ACCEPT_RCVD: | |
| 185 cli_auth_getmethods(); | |
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186 cli_ses.state = USERAUTH_REQ_SENT; |
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187 TRACE(("leave cli_sessionloop: sent userauth methods req")); |
| 33 | 188 return; |
| 189 | |
| 190 case USERAUTH_FAIL_RCVD: | |
| 191 cli_auth_try(); | |
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192 cli_ses.state = USERAUTH_REQ_SENT; |
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193 TRACE(("leave cli_sessionloop: cli_auth_try")); |
| 33 | 194 return; |
| 195 | |
| 47 | 196 /* |
| 37 | 197 case USERAUTH_SUCCESS_RCVD: |
| 198 send_msg_service_request(SSH_SERVICE_CONNECTION); | |
| 199 cli_ses.state = SERVICE_CONN_REQ_SENT; | |
| 200 TRACE(("leave cli_sessionloop: sent ssh-connection service req")); | |
| 201 return; | |
| 202 | |
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203 case SERVICE_CONN_ACCEPT_RCVD: |
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204 cli_send_chansess_request(); |
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205 TRACE(("leave cli_sessionloop: cli_send_chansess_request")); |
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206 cli_ses.state = SESSION_RUNNING; |
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207 return; |
| 47 | 208 */ |
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209 |
| 37 | 210 case USERAUTH_SUCCESS_RCVD: |
| 64 | 211 #ifdef ENABLE_CLI_LOCALTCPFWD |
| 212 setup_localtcp(); | |
| 213 #endif | |
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214 #ifdef ENABLE_CLI_REMOTETCPFWD |
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215 setup_remotetcp(); |
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216 #endif |
| 37 | 217 cli_send_chansess_request(); |
| 218 TRACE(("leave cli_sessionloop: cli_send_chansess_request")); | |
| 219 cli_ses.state = SESSION_RUNNING; | |
| 220 return; | |
| 221 | |
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222 case SESSION_RUNNING: |
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223 if (ses.chancount < 1) { |
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224 cli_finished(); |
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225 } |
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226 |
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227 if (cli_ses.winchange) { |
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228 cli_chansess_winchange(); |
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229 } |
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230 return; |
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231 |
| 33 | 232 /* XXX more here needed */ |
| 233 | |
| 234 | |
| 235 default: | |
| 236 break; | |
| 26 | 237 } |
| 238 | |
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239 TRACE(("leave cli_sessionloop: fell out")); |
| 26 | 240 |
| 241 } | |
| 242 | |
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243 void cli_session_cleanup() { |
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244 |
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245 if (!sessinitdone) { |
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246 return; |
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247 } |
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248 |
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249 /* Set stdin back to non-blocking - busybox ash dies nastily |
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250 * if we don't revert the flags */ |
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251 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags); |
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252 |
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253 cli_tty_cleanup(); |
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254 |
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255 } |
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256 |
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257 static void cli_finished() { |
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258 |
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259 cli_session_cleanup(); |
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260 common_session_cleanup(); |
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261 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username, |
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262 cli_opts.remotehost, cli_opts.remoteport); |
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263 exit(EXIT_SUCCESS); |
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264 } |
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265 |
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266 |
| 26 | 267 /* called when the remote side closes the connection */ |
| 268 static void cli_remoteclosed() { | |
| 269 | |
| 270 /* XXX TODO perhaps print a friendlier message if we get this but have | |
| 271 * already sent/received disconnect message(s) ??? */ | |
| 272 close(ses.sock); | |
| 273 ses.sock = -1; | |
| 33 | 274 dropbear_exit("remote closed the connection"); |
| 26 | 275 } |
| 43 | 276 |
| 277 /* Operates in-place turning dirty (untrusted potentially containing control | |
| 278 * characters) text into clean text. */ | |
| 279 void cleantext(unsigned char* dirtytext) { | |
| 280 | |
| 281 unsigned int i, j; | |
| 47 | 282 unsigned char c; |
| 43 | 283 |
| 284 j = 0; | |
| 285 for (i = 0; dirtytext[i] != '\0'; i++) { | |
| 286 | |
| 287 c = dirtytext[i]; | |
| 288 /* We can ignore '\r's */ | |
| 289 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
| 290 dirtytext[j] = c; | |
| 291 j++; | |
| 292 } | |
| 293 } | |
| 294 /* Null terminate */ | |
| 295 dirtytext[j] = '\0'; | |
| 296 } |