Mercurial > dropbear
annotate cli-session.c @ 1156:a8f4dade70e5
avoid getpass when not used
some systems (like android's bionic) do not provide getpass. you can
disable ENABLE_CLI_PASSWORD_AUTH & ENABLE_CLI_INTERACT_AUTH to avoid
its use (and rely on pubkey auth), but the link still fails because
the support file calls getpass. do not define this func if both of
those auth methods are not used.
author | Mike Frysinger <vapier@gentoo.org> |
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date | Wed, 21 Oct 2015 22:39:55 +0800 |
parents | 6aeadee3f16b |
children | fb58cf341951 |
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" |
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34 #include "dbrandom.h" |
33 | 35 #include "service.h" |
40
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36 #include "runopts.h" |
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37 #include "chansession.h" |
547
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38 #include "agentfwd.h" |
766 | 39 #include "crypto_desc.h" |
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40 #include "netio.h" |
26 | 41 |
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42 static void cli_remoteclosed() ATTRIB_NORETURN; |
26 | 43 static void cli_sessionloop(); |
33 | 44 static void cli_session_init(); |
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45 static void cli_finished() ATTRIB_NORETURN; |
727
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46 static void recv_msg_service_accept(void); |
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47 static void cli_session_cleanup(void); |
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48 static void recv_msg_global_request_cli(void); |
26 | 49 |
50 struct clientsession cli_ses; /* GLOBAL */ | |
51 | |
45
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52 /* Sorted in decreasing frequency will be more efficient - data and window |
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53 * should be first */ |
26 | 54 static const packettype cli_packettypes[] = { |
74
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55 /* TYPE, FUNCTION */ |
26 | 56 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data}, |
107 | 57 {SSH_MSG_CHANNEL_EXTENDED_DATA, recv_msg_channel_extended_data}, |
26 | 58 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust}, |
45
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59 {SSH_MSG_USERAUTH_FAILURE, recv_msg_userauth_failure}, /* client */ |
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60 {SSH_MSG_USERAUTH_SUCCESS, recv_msg_userauth_success}, /* client */ |
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61 {SSH_MSG_KEXINIT, recv_msg_kexinit}, |
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62 {SSH_MSG_KEXDH_REPLY, recv_msg_kexdh_reply}, /* client */ |
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63 {SSH_MSG_NEWKEYS, recv_msg_newkeys}, |
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64 {SSH_MSG_SERVICE_ACCEPT, recv_msg_service_accept}, /* client */ |
26 | 65 {SSH_MSG_CHANNEL_REQUEST, recv_msg_channel_request}, |
66 {SSH_MSG_CHANNEL_OPEN, recv_msg_channel_open}, | |
67 {SSH_MSG_CHANNEL_EOF, recv_msg_channel_eof}, | |
68 {SSH_MSG_CHANNEL_CLOSE, recv_msg_channel_close}, | |
69 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation}, | |
70 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure}, | |
45
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71 {SSH_MSG_USERAUTH_BANNER, recv_msg_userauth_banner}, /* client */ |
249
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72 {SSH_MSG_USERAUTH_SPECIFIC_60, recv_msg_userauth_specific_60}, /* client */ |
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73 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_cli}, |
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74 {SSH_MSG_CHANNEL_SUCCESS, ignore_recv_response}, |
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75 {SSH_MSG_CHANNEL_FAILURE, ignore_recv_response}, |
505
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76 #ifdef ENABLE_CLI_REMOTETCPFWD |
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77 {SSH_MSG_REQUEST_SUCCESS, cli_recv_msg_request_success}, /* client */ |
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78 {SSH_MSG_REQUEST_FAILURE, cli_recv_msg_request_failure}, /* client */ |
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79 #else |
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80 /* For keepalive */ |
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81 {SSH_MSG_REQUEST_SUCCESS, ignore_recv_response}, |
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82 {SSH_MSG_REQUEST_FAILURE, ignore_recv_response}, |
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83 #endif |
26 | 84 {0, 0} /* End */ |
85 }; | |
86 | |
87 static const struct ChanType *cli_chantypes[] = { | |
64 | 88 #ifdef ENABLE_CLI_REMOTETCPFWD |
89 &cli_chan_tcpremote, | |
90 #endif | |
225
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91 #ifdef ENABLE_CLI_AGENTFWD |
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92 &cli_chan_agent, |
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93 #endif |
26 | 94 NULL /* Null termination */ |
95 }; | |
33 | 96 |
1025 | 97 void cli_connected(int result, int sock, void* userdata, const char *errstring) |
98 { | |
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99 struct sshsession *myses = userdata; |
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100 if (result == DROPBEAR_FAILURE) { |
1025 | 101 dropbear_exit("Connect failed: %s", errstring); |
102 } | |
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103 myses->sock_in = myses->sock_out = sock; |
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104 update_channel_prio(); |
1025 | 105 } |
106 | |
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107 void cli_session(int sock_in, int sock_out, struct dropbear_progress_connection *progress) { |
26 | 108 |
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109 common_session_init(sock_in, sock_out); |
26 | 110 |
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111 if (progress) { |
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112 connect_set_writequeue(progress, &ses.writequeue); |
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113 } |
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114 |
26 | 115 chaninitialise(cli_chantypes); |
116 | |
33 | 117 /* Set up cli_ses vars */ |
118 cli_session_init(); | |
26 | 119 |
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120 |
26 | 121 /* Ready to go */ |
122 sessinitdone = 1; | |
123 | |
124 /* Exchange identification */ | |
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125 send_session_identification(); |
26 | 126 |
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127 kexfirstinitialise(); /* initialise the kex state */ |
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128 |
26 | 129 send_msg_kexinit(); |
130 | |
131 session_loop(cli_sessionloop); | |
132 | |
133 /* Not reached */ | |
134 | |
33 | 135 } |
26 | 136 |
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137 #ifdef USE_KEX_FIRST_FOLLOWS |
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138 static void cli_send_kex_first_guess() { |
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139 send_msg_kexdh_init(); |
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140 } |
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141 #endif |
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142 |
33 | 143 static void cli_session_init() { |
144 | |
145 cli_ses.state = STATE_NOTHING; | |
146 cli_ses.kex_state = KEX_NOTHING; | |
147 | |
39
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148 cli_ses.tty_raw_mode = 0; |
41
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149 cli_ses.winchange = 0; |
39
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150 |
175
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151 /* We store std{in,out,err}'s flags, so we can set them back on exit |
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152 * (otherwise busybox's ash isn't happy */ |
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153 cli_ses.stdincopy = dup(STDIN_FILENO); |
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154 cli_ses.stdinflags = fcntl(STDIN_FILENO, F_GETFL, 0); |
175
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155 cli_ses.stdoutcopy = dup(STDOUT_FILENO); |
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156 cli_ses.stdoutflags = fcntl(STDOUT_FILENO, F_GETFL, 0); |
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157 cli_ses.stderrcopy = dup(STDERR_FILENO); |
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158 cli_ses.stderrflags = fcntl(STDERR_FILENO, F_GETFL, 0); |
99
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159 |
108
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160 cli_ses.retval = EXIT_SUCCESS; /* Assume it's clean if we don't get a |
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161 specific exit status */ |
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162 |
47 | 163 /* Auth */ |
215
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164 cli_ses.lastprivkey = NULL; |
136
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165 cli_ses.lastauthtype = 0; |
47 | 166 |
686
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167 #ifdef DROPBEAR_NONE_CIPHER |
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168 cli_ses.cipher_none_after_auth = get_algo_usable(sshciphers, "none"); |
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169 set_algo_usable(sshciphers, "none", 0); |
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170 #else |
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171 cli_ses.cipher_none_after_auth = 0; |
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172 #endif |
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173 |
33 | 174 /* For printing "remote host closed" for the user */ |
175 ses.remoteclosed = cli_remoteclosed; | |
176 | |
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177 ses.extra_session_cleanup = cli_session_cleanup; |
33 | 178 |
179 /* packet handlers */ | |
180 ses.packettypes = cli_packettypes; | |
35
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181 |
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182 ses.isserver = 0; |
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183 |
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184 #ifdef USE_KEX_FIRST_FOLLOWS |
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185 ses.send_kex_first_guess = cli_send_kex_first_guess; |
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186 #endif |
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187 |
26 | 188 } |
189 | |
727
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190 static void send_msg_service_request(char* servicename) { |
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191 |
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192 TRACE(("enter send_msg_service_request: servicename='%s'", servicename)) |
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193 |
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194 CHECKCLEARTOWRITE(); |
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195 |
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196 buf_putbyte(ses.writepayload, SSH_MSG_SERVICE_REQUEST); |
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197 buf_putstring(ses.writepayload, servicename, strlen(servicename)); |
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198 |
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199 encrypt_packet(); |
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200 TRACE(("leave send_msg_service_request")) |
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201 } |
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202 |
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203 static void recv_msg_service_accept(void) { |
857 | 204 /* do nothing, if it failed then the server MUST have disconnected */ |
727
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205 } |
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206 |
33 | 207 /* This function drives the progress of the session - it initiates KEX, |
208 * service, userauth and channel requests */ | |
26 | 209 static void cli_sessionloop() { |
210 | |
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211 TRACE2(("enter cli_sessionloop")) |
33 | 212 |
745
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213 if (ses.lastpacket == 0) { |
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214 TRACE2(("exit cli_sessionloop: no real packets yet")) |
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215 return; |
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216 } |
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217 |
34
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diff
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218 if (ses.lastpacket == SSH_MSG_KEXINIT && cli_ses.kex_state == KEX_NOTHING) { |
33 | 219 /* We initiate the KEXDH. If DH wasn't the correct type, the KEXINIT |
220 * negotiation would have failed. */ | |
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221 if (!ses.kexstate.our_first_follows_matches) { |
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222 send_msg_kexdh_init(); |
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|
223 } |
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224 cli_ses.kex_state = KEXDH_INIT_SENT; |
165
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|
225 TRACE(("leave cli_sessionloop: done with KEXINIT_RCVD")) |
33 | 226 return; |
227 } | |
228 | |
229 /* A KEX has finished, so we should go back to our KEX_NOTHING state */ | |
753
d63ef1e211ea
Take transmit and receive keys into use separately
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230 if (cli_ses.kex_state != KEX_NOTHING && ses.kexstate.sentnewkeys) { |
33 | 231 cli_ses.kex_state = KEX_NOTHING; |
232 } | |
233 | |
234 /* We shouldn't do anything else if a KEX is in progress */ | |
235 if (cli_ses.kex_state != KEX_NOTHING) { | |
165
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|
236 TRACE(("leave cli_sessionloop: kex_state != KEX_NOTHING")) |
33 | 237 return; |
238 } | |
239 | |
240 if (ses.kexstate.donefirstkex == 0) { | |
745
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241 /* We might reach here if we have partial packet reads or have |
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242 * received SSG_MSG_IGNORE etc. Just skip it */ |
753
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243 TRACE2(("donefirstkex false\n")) |
34
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Client mostly works up to password auth
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diff
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244 return; |
33 | 245 } |
246 | |
26 | 247 switch (cli_ses.state) { |
248 | |
33 | 249 case STATE_NOTHING: |
250 /* We've got the transport layer sorted, we now need to request | |
251 * userauth */ | |
252 send_msg_service_request(SSH_SERVICE_USERAUTH); | |
253 cli_auth_getmethods(); | |
45
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254 cli_ses.state = USERAUTH_REQ_SENT; |
165
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|
255 TRACE(("leave cli_sessionloop: sent userauth methods req")) |
33 | 256 return; |
883
ff597bf2cfb0
DROPBEAR_CLI_AUTH_IMMEDIATE fixed, now enabled by default
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|
257 |
ff597bf2cfb0
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changeset
|
258 case USERAUTH_REQ_SENT: |
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259 TRACE(("leave cli_sessionloop: waiting, req_sent")) |
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|
260 return; |
33 | 261 |
262 case USERAUTH_FAIL_RCVD: | |
734
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Be a bit more careful about when we want to use CLI_AUTH_IMMEDIATE
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263 if (cli_auth_try() == DROPBEAR_FAILURE) { |
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diff
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|
264 dropbear_exit("No auth methods could be used."); |
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265 } |
45
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diff
changeset
|
266 cli_ses.state = USERAUTH_REQ_SENT; |
165
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changeset
|
267 TRACE(("leave cli_sessionloop: cli_auth_try")) |
33 | 268 return; |
269 | |
37 | 270 case USERAUTH_SUCCESS_RCVD: |
326
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271 |
686
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272 #ifdef DROPBEAR_NONE_CIPHER |
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- Only request "none" cipher after auth has succeeded
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273 if (cli_ses.cipher_none_after_auth) |
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- Only request "none" cipher after auth has succeeded
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274 { |
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275 set_algo_usable(sshciphers, "none", 1); |
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- Only request "none" cipher after auth has succeeded
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276 send_msg_kexinit(); |
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277 } |
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278 #endif |
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279 |
326
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280 if (cli_opts.backgrounded) { |
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diff
changeset
|
281 int devnull; |
433
c216212001fc
Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
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diff
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|
282 /* keeping stdin open steals input from the terminal and |
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Fix for -pedantic -ansi compilation, change // to /**/, plus some signedness
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diff
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283 is confusing, though stdout/stderr could be useful. */ |
326
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284 devnull = open(_PATH_DEVNULL, O_RDONLY); |
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diff
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285 if (devnull < 0) { |
594
a98a2138364a
Improve capitalisation for all logged strings
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568
diff
changeset
|
286 dropbear_exit("Opening /dev/null: %d %s", |
326
d965110e3f5c
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|
287 errno, strerror(errno)); |
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288 } |
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289 dup2(devnull, STDIN_FILENO); |
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290 if (daemon(0, 1) < 0) { |
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changeset
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291 dropbear_exit("Backgrounding failed: %d %s", |
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changeset
|
292 errno, strerror(errno)); |
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293 } |
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294 } |
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295 |
485
12d845ab7b5f
Rework netcat-alike to be a proper mode, with -B argument.
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changeset
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296 #ifdef ENABLE_CLI_NETCAT |
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Rework netcat-alike to be a proper mode, with -B argument.
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297 if (cli_opts.netcat_host) { |
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298 cli_send_netcat_request(); |
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299 } else |
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|
300 #endif |
560 | 301 if (!cli_opts.no_cmd) { |
325
0e4f225b7e07
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diff
changeset
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302 cli_send_chansess_request(); |
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303 } |
754
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304 |
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305 #ifdef ENABLE_CLI_LOCALTCPFWD |
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changeset
|
306 setup_localtcp(); |
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307 #endif |
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|
308 #ifdef ENABLE_CLI_REMOTETCPFWD |
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|
309 setup_remotetcp(); |
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310 #endif |
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311 |
325
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diff
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312 TRACE(("leave cli_sessionloop: running")) |
37 | 313 cli_ses.state = SESSION_RUNNING; |
314 return; | |
315 | |
40
b4874d772210
- Added terminal mode handling etc for the client, and window change
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39
diff
changeset
|
316 case SESSION_RUNNING: |
325
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diff
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317 if (ses.chancount < 1 && !cli_opts.no_cmd) { |
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318 cli_finished(); |
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319 } |
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320 |
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321 if (cli_ses.winchange) { |
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322 cli_chansess_winchange(); |
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323 } |
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324 return; |
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325 |
33 | 326 /* XXX more here needed */ |
327 | |
328 | |
329 default: | |
330 break; | |
26 | 331 } |
332 | |
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333 TRACE2(("leave cli_sessionloop: fell out")) |
26 | 334 |
335 } | |
336 | |
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337 static void cli_session_cleanup(void) { |
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338 |
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339 if (!sessinitdone) { |
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340 return; |
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341 } |
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342 |
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343 /* Set std{in,out,err} back to non-blocking - busybox ash dies nastily if |
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344 * we don't revert the flags */ |
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345 fcntl(cli_ses.stdincopy, F_SETFL, cli_ses.stdinflags); |
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346 fcntl(cli_ses.stdoutcopy, F_SETFL, cli_ses.stdoutflags); |
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347 fcntl(cli_ses.stderrcopy, F_SETFL, cli_ses.stderrflags); |
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348 |
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349 cli_tty_cleanup(); |
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350 |
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351 } |
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352 |
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353 static void cli_finished() { |
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354 |
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355 session_cleanup(); |
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356 fprintf(stderr, "Connection to %s@%s:%s closed.\n", cli_opts.username, |
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357 cli_opts.remotehost, cli_opts.remoteport); |
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358 exit(cli_ses.retval); |
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359 } |
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360 |
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361 |
26 | 362 /* called when the remote side closes the connection */ |
363 static void cli_remoteclosed() { | |
364 | |
365 /* XXX TODO perhaps print a friendlier message if we get this but have | |
366 * already sent/received disconnect message(s) ??? */ | |
479
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367 m_close(ses.sock_in); |
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368 m_close(ses.sock_out); |
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369 ses.sock_in = -1; |
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370 ses.sock_out = -1; |
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371 dropbear_exit("Remote closed the connection"); |
26 | 372 } |
43 | 373 |
374 /* Operates in-place turning dirty (untrusted potentially containing control | |
249
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375 * characters) text into clean text. |
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376 * Note: this is safe only with ascii - other charsets could have problems. */ |
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377 void cleantext(char* dirtytext) { |
43 | 378 |
379 unsigned int i, j; | |
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380 char c; |
43 | 381 |
382 j = 0; | |
383 for (i = 0; dirtytext[i] != '\0'; i++) { | |
384 | |
385 c = dirtytext[i]; | |
386 /* We can ignore '\r's */ | |
387 if ( (c >= ' ' && c <= '~') || c == '\n' || c == '\t') { | |
388 dirtytext[j] = c; | |
389 j++; | |
390 } | |
391 } | |
392 /* Null terminate */ | |
393 dirtytext[j] = '\0'; | |
394 } | |
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395 |
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396 static void recv_msg_global_request_cli(void) { |
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397 TRACE(("recv_msg_global_request_cli")) |
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398 /* Send a proper rejection */ |
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399 send_msg_request_failure(); |
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400 } |