Mercurial > dropbear
annotate cli-session.c @ 53:0fe267cc9dee
Be a bit safer with reentrant pw_name
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 08 Aug 2004 16:41:26 +0000 |
| parents | 4b53a43f0082 |
| children | 20563735e8b5 |
| rev | line source |
|---|---|
| 26 | 1 #include "includes.h" |
| 2 #include "session.h" | |
| 3 #include "dbutil.h" | |
| 4 #include "kex.h" | |
| 5 #include "ssh.h" | |
| 6 #include "packet.h" | |
| 7 #include "tcpfwd-direct.h" | |
| 8 #include "tcpfwd-remote.h" | |
| 9 #include "channel.h" | |
| 10 #include "random.h" | |
| 33 | 11 #include "service.h" |
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12 #include "runopts.h" |
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13 #include "chansession.h" |
| 26 | 14 |
| 15 static void cli_remoteclosed(); | |
| 16 static void cli_sessionloop(); | |
| 33 | 17 static void cli_session_init(); |
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18 static void cli_finished(); |
| 26 | 19 |
| 20 struct clientsession cli_ses; /* GLOBAL */ | |
| 21 | |
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22 /* Sorted in decreasing frequency will be more efficient - data and window |
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23 * should be first */ |
| 26 | 24 static const packettype cli_packettypes[] = { |
| 25 /* TYPE, AUTHREQUIRED, FUNCTION */ | |
| 26 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data}, | |
| 27 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, | |
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28 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */ |
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29 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */ |
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30 {SSH_MSG_KEXINIT, recv_msg_kexinit}, |
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31 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */ |
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32 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, |
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33 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */ |
| 26 | 34 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp}, |
| 35 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, | |
| 36 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, | |
| 37 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, | |
| 38 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, | |
| 39 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, | |
| 40 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, | |
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41 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */ |
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42 #ifdef DROPBEAR_PUBKEY_AUTH |
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43 {SSH_MSG_USERAUTH_PK_OK, recv_msg_userauth_pk_ok}, /* client */ |
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44 #endif |
| 26 | 45 {0, 0} /* End */ |
| 46 }; | |
| 47 | |
| 48 static const struct ChanType *cli_chantypes[] = { | |
| 49 /* &chan_tcpdirect etc, though need to only allow if we've requested | |
| 50 * that forwarding */ | |
| 51 NULL /* Null termination */ | |
| 52 }; | |
| 33 | 53 |
| 26 | 54 void cli_session(int sock, char* remotehost) { |
| 55 | |
| 56 crypto_init(); | |
| 57 common_session_init(sock, remotehost); | |
| 58 | |
| 59 chaninitialise(cli_chantypes); | |
| 60 | |
| 61 | |
| 33 | 62 /* Set up cli_ses vars */ |
| 63 cli_session_init(); | |
| 26 | 64 |
| 65 /* Ready to go */ | |
| 66 sessinitdone = 1; | |
| 67 | |
| 68 /* Exchange identification */ | |
| 69 session_identification(); | |
| 70 | |
| 71 seedrandom(); | |
| 72 | |
| 73 send_msg_kexinit(); | |
| 74 | |
| 75 /* XXX here we do stuff differently */ | |
| 76 | |
| 77 session_loop(cli_sessionloop); | |
| 78 | |
| 79 /* Not reached */ | |
| 80 | |
| 33 | 81 } |
| 26 | 82 |
| 33 | 83 static void cli_session_init() { |
| 84 | |
| 85 cli_ses.state = STATE_NOTHING; | |
| 86 cli_ses.kex_state = KEX_NOTHING; | |
| 87 | |
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88 cli_ses.tty_raw_mode = 0; |
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89 cli_ses.winchange = 0; |
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90 |
| 47 | 91 /* Auth */ |
| 92 cli_ses.lastpubkey = NULL; | |
| 93 cli_ses.lastauthtype = NULL; | |
| 94 | |
| 33 | 95 /* For printing "remote host closed" for the user */ |
| 96 ses.remoteclosed = cli_remoteclosed; | |
| 97 ses.buf_match_algo = cli_buf_match_algo; | |
| 98 | |
| 99 /* packet handlers */ | |
| 100 ses.packettypes = cli_packettypes; | |
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101 |
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102 ses.isserver = 0; |
| 26 | 103 } |
| 104 | |
| 33 | 105 /* This function drives the progress of the session - it initiates KEX, |
| 106 * service, userauth and channel requests */ | |
| 26 | 107 static void cli_sessionloop() { |
| 108 | |
| 33 | 109 TRACE(("enter cli_sessionloop")); |
| 110 | |
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111 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
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112 cli_ses.kex_state = KEXINIT_RCVD; |
| 33 | 113 } |
| 114 | |
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115 if (cli_ses.kex_state == KEXINIT_RCVD) { |
| 33 | 116 |
| 117 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT | |
| 118 * negotiation would have failed. */ | |
| 119 send_msg_kexdh_init(); | |
| 120 cli_ses.kex_state = KEXDH_INIT_SENT; | |
| 121 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")); | |
| 122 return; | |
| 123 } | |
| 124 | |
| 125 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
| 126 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.recvkexinit == 0 | |
| 127 && ses.kexstate.sentkexinit == 0) { | |
| 128 cli_ses.kex_state = KEX_NOTHING; | |
| 129 } | |
| 130 | |
| 131 /* We shouldn't do anything else if a KEX is in progress */ | |
| 132 if (cli_ses.kex_state != KEX_NOTHING) { | |
| 133 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")); | |
| 134 return; | |
| 135 } | |
| 136 | |
| 137 /* We should exit if we haven't donefirstkex: we shouldn't reach here | |
| 138 * in normal operation */ | |
| 139 if (ses.kexstate.donefirstkex == 0) { | |
| 140 TRACE(("XXX XXX might be bad! leave cli_sessionloop: haven't donefirstkex")); | |
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141 return; |
| 33 | 142 } |
| 143 | |
| 26 | 144 switch (cli_ses.state) { |
| 145 | |
| 33 | 146 case STATE_NOTHING: |
| 147 /* We've got the transport layer sorted, we now need to request | |
| 148 * userauth */ | |
| 149 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
| 150 cli_ses.state = SERVICE_AUTH_REQ_SENT; | |
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151 TRACE(("leave cli_sessionloop: sent userauth service req")); |
| 33 | 152 return; |
| 26 | 153 |
| 33 | 154 /* userauth code */ |
| 155 case SERVICE_AUTH_ACCEPT_RCVD: | |
| 156 cli_auth_getmethods(); | |
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157 cli_ses.state = USERAUTH_REQ_SENT; |
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158 TRACE(("leave cli_sessionloop: sent userauth methods req")); |
| 33 | 159 return; |
| 160 | |
| 161 case USERAUTH_FAIL_RCVD: | |
| 162 cli_auth_try(); | |
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163 cli_ses.state = USERAUTH_REQ_SENT; |
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164 TRACE(("leave cli_sessionloop: cli_auth_try")); |
| 33 | 165 return; |
| 166 | |
| 47 | 167 /* |
| 37 | 168 case USERAUTH_SUCCESS_RCVD: |
| 169 send_msg_service_request(SSH_SERVICE_CONNECTION); | |
| 170 cli_ses.state = SERVICE_CONN_REQ_SENT; | |
| 171 TRACE(("leave cli_sessionloop: sent ssh-connection service req")); | |
| 172 return; | |
| 173 | |
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174 case SERVICE_CONN_ACCEPT_RCVD: |
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175 cli_send_chansess_request(); |
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176 TRACE(("leave cli_sessionloop: cli_send_chansess_request")); |
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177 cli_ses.state = SESSION_RUNNING; |
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178 return; |
| 47 | 179 */ |
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180 |
| 37 | 181 case USERAUTH_SUCCESS_RCVD: |
| 182 cli_send_chansess_request(); | |
| 183 TRACE(("leave cli_sessionloop: cli_send_chansess_request")); | |
| 184 cli_ses.state = SESSION_RUNNING; | |
| 185 return; | |
| 186 | |
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187 case SESSION_RUNNING: |
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188 if (ses.chancount < 1) { |
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189 cli_finished(); |
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190 } |
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191 |
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192 if (cli_ses.winchange) { |
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193 cli_chansess_winchange(); |
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194 } |
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195 return; |
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196 |
| 33 | 197 /* XXX more here needed */ |
| 198 | |
| 199 | |
| 200 default: | |
| 201 break; | |
| 26 | 202 } |
| 203 | |
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204 TRACE(("leave cli_sessionloop: fell out")); |
| 26 | 205 |
| 206 } | |
| 207 | |
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208 void cli_session_cleanup() { |
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209 |
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210 if (!sessinitdone) { |
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211 return; |
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212 } |
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213 cli_tty_cleanup(); |
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214 |
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215 } |
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216 |
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217 static void cli_finished() { |
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218 |
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219 cli_session_cleanup(); |
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220 common_session_cleanup(); |
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221 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username, |
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222 cli_opts.remotehost, cli_opts.remoteport); |
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223 exit(EXIT_SUCCESS); |
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224 } |
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225 |
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226 |
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227 |
| 26 | 228 /* called when the remote side closes the connection */ |
| 229 static void cli_remoteclosed() { | |
| 230 | |
| 231 /* XXX TODO perhaps print a friendlier message if we get this but have | |
| 232 * already sent/received disconnect message(s) ??? */ | |
| 233 close(ses.sock); | |
| 234 ses.sock = -1; | |
| 33 | 235 dropbear_exit("remote closed the connection"); |
| 26 | 236 } |
| 43 | 237 |
| 238 /* Operates in-place turning dirty (untrusted potentially containing control | |
| 239 * characters) text into clean text. */ | |
| 240 void cleantext(unsigned char* dirtytext) { | |
| 241 | |
| 242 unsigned int i, j; | |
| 47 | 243 unsigned char c; |
| 43 | 244 |
| 245 j = 0; | |
| 246 for (i = 0; dirtytext[i] != '\0'; i++) { | |
| 247 | |
| 248 c = dirtytext[i]; | |
| 249 /* We can ignore '\r's */ | |
| 250 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
| 251 dirtytext[j] = c; | |
| 252 j++; | |
| 253 } | |
| 254 } | |
| 255 /* Null terminate */ | |
| 256 dirtytext[j] = '\0'; | |
| 257 } |