Mercurial > dropbear

comparison svr-session.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
parents 3be7ae2e8dfa
children 973fccb59ea4 a588558bfc94
comparison
equal deleted inserted replaced
281:997e6f7dc01e 285:1b9e69c058d2
1 /*
2 * Dropbear - a SSH2 server
3 *
4 * Copyright (c) 2002,2003 Matt Johnston
5 * All rights reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a copy
8 * of this software and associated documentation files (the "Software"), to deal
9 * in the Software without restriction, including without limitation the rights
10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
11 * copies of the Software, and to permit persons to whom the Software is
12 * furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included in
15 * all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE. */
24
25 #include "includes.h"
26 #include "session.h"
27 #include "dbutil.h"
28 #include "packet.h"
29 #include "algo.h"
30 #include "buffer.h"
31 #include "dss.h"
32 #include "ssh.h"
33 #include "random.h"
34 #include "kex.h"
35 #include "channel.h"
36 #include "chansession.h"
37 #include "atomicio.h"
38 #include "tcpfwd.h"
39 #include "service.h"
40 #include "auth.h"
41 #include "runopts.h"
42
43 static void svr_remoteclosed();
44
45 struct serversession svr_ses; /* GLOBAL */
46
47 static const packettype svr_packettypes[] = {
48 {SSH_MSG_CHANNEL_DATA, recv_msg_channel_data},
49 {SSH_MSG_CHANNEL_WINDOW_ADJUST, recv_msg_channel_window_adjust},
50 {SSH_MSG_USERAUTH_REQUEST, recv_msg_userauth_request}, /* server */
51 {SSH_MSG_SERVICE_REQUEST, recv_msg_service_request}, /* server */
52 {SSH_MSG_KEXINIT, recv_msg_kexinit},
53 {SSH_MSG_KEXDH_INIT, recv_msg_kexdh_init}, /* server */
54 {SSH_MSG_NEWKEYS, recv_msg_newkeys},
55 #ifdef ENABLE_SVR_REMOTETCPFWD
56 {SSH_MSG_GLOBAL_REQUEST, recv_msg_global_request_remotetcp},
57 #endif
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 #ifdef USING_LISTENERS
63 {SSH_MSG_CHANNEL_OPEN_CONFIRMATION, recv_msg_channel_open_confirmation},
64 {SSH_MSG_CHANNEL_OPEN_FAILURE, recv_msg_channel_open_failure},
65 #endif
66 {0, 0} /* End */
67 };
68
69 static const struct ChanType *svr_chantypes[] = {
70 &svrchansess,
71 #ifdef ENABLE_SVR_LOCALTCPFWD
72 &svr_chan_tcpdirect,
73 #endif
74 NULL /* Null termination is mandatory. */
75 };
76
77 void svr_session(int sock, int childpipe,
78 char* remotehost, char *addrstring) {
79
80 struct timeval timeout;
81
82 reseedrandom();
83
84 crypto_init();
85 common_session_init(sock, remotehost);
86
87 /* Initialise server specific parts of the session */
88 svr_ses.childpipe = childpipe;
89 svr_ses.addrstring = addrstring;
90 svr_authinitialise();
91 chaninitialise(svr_chantypes);
92 svr_chansessinitialise();
93
94 if (gettimeofday(&timeout, 0) < 0) {
95 dropbear_exit("Error getting time");
96 }
97
98 ses.connecttimeout = timeout.tv_sec + AUTH_TIMEOUT;
99
100 /* set up messages etc */
101 ses.remoteclosed = svr_remoteclosed;
102
103 /* packet handlers */
104 ses.packettypes = svr_packettypes;
105 ses.buf_match_algo = svr_buf_match_algo;
106
107 ses.isserver = 1;
108
109 /* We're ready to go now */
110 sessinitdone = 1;
111
112 /* exchange identification, version etc */
113 session_identification();
114
115 /* start off with key exchange */
116 send_msg_kexinit();
117
118 /* Run the main for loop. NULL is for the dispatcher - only the client
119 * code makes use of it */
120 session_loop(NULL);
121
122 /* Not reached */
123
124 }
125
126 /* failure exit - format must be <= 100 chars */
127 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
128
129 char fmtbuf[300];
130
131 if (!sessinitdone) {
132 /* before session init */
133 snprintf(fmtbuf, sizeof(fmtbuf),
134 "premature exit: %s", format);
135 } else if (ses.authstate.authdone) {
136 /* user has authenticated */
137 snprintf(fmtbuf, sizeof(fmtbuf),
138 "exit after auth (%s): %s",
139 ses.authstate.printableuser, format);
140 } else if (ses.authstate.printableuser) {
141 /* we have a potential user */
142 snprintf(fmtbuf, sizeof(fmtbuf),
143 "exit before auth (user '%s', %d fails): %s",
144 ses.authstate.printableuser, ses.authstate.failcount, format);
145 } else {
146 /* before userauth */
147 snprintf(fmtbuf, sizeof(fmtbuf),
148 "exit before auth: %s", format);
149 }
150
151 _dropbear_log(LOG_INFO, fmtbuf, param);
152
153 /* must be after we've done with username etc */
154 common_session_cleanup();
155
156 exit(exitcode);
157
158 }
159
160 /* priority is priority as with syslog() */
161 void svr_dropbear_log(int priority, const char* format, va_list param) {
162
163 char printbuf[1024];
164 char datestr[20];
165 time_t timesec;
166 int havetrace = 0;
167
168 vsnprintf(printbuf, sizeof(printbuf), format, param);
169
170 #ifndef DISABLE_SYSLOG
171 if (svr_opts.usingsyslog) {
172 syslog(priority, "%s", printbuf);
173 }
174 #endif
175
176 /* if we are using DEBUG_TRACE, we want to print to stderr even if
177 * syslog is used, so it is included in error reports */
178 #ifdef DEBUG_TRACE
179 havetrace = debug_trace;
180 #endif
181
182 if (!svr_opts.usingsyslog || havetrace)
183 {
184 timesec = time(NULL);
185 if (strftime(datestr, sizeof(datestr), "%b %d %H:%M:%S",
186 localtime(&timesec)) == 0) {
187 datestr[0] = '?'; datestr[1] = '\0';
188 }
189 fprintf(stderr, "[%d] %s %s\n", getpid(), datestr, printbuf);
190 }
191 }
192
193 /* called when the remote side closes the connection */
194 static void svr_remoteclosed() {
195
196 close(ses.sock);
197 ses.sock = -1;
198 dropbear_close("Exited normally");
199
200 }
201