Mercurial > dropbear
annotate svr-tcpfwd.c @ 738:2001bc3c9397
add IUTF8
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 02 Apr 2013 19:11:13 +0800 |
parents | dfdb9d9189ff |
children | c19acba28590 |
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 |
62 | 26 #include "includes.h" |
27 #include "ssh.h" | |
64 | 28 #include "tcpfwd.h" |
62 | 29 #include "dbutil.h" |
30 #include "session.h" | |
31 #include "buffer.h" | |
32 #include "packet.h" | |
33 #include "listener.h" | |
34 #include "runopts.h" | |
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35 #include "auth.h" |
62 | 36 |
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37 static void send_msg_request_failure(); |
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38 |
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39 static void send_msg_request_failure() { |
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40 CHECKCLEARTOWRITE(); |
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41 buf_putbyte(ses.writepayload, SSH_MSG_REQUEST_FAILURE); |
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42 encrypt_packet(); |
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43 } |
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44 |
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45 #ifndef ENABLE_SVR_REMOTETCPFWD |
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46 |
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47 /* This is better than SSH_MSG_UNIMPLEMENTED */ |
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48 void recv_msg_global_request_remotetcp() { |
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49 TRACE(("recv_msg_global_request_remotetcp: remote tcp forwarding not compiled in")) |
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50 send_msg_request_failure(); |
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51 } |
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52 |
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53 /* */ |
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54 #endif /* !ENABLE_SVR_REMOTETCPFWD */ |
62 | 55 |
56 static void send_msg_request_success(); | |
57 static int svr_cancelremotetcp(); | |
58 static int svr_remotetcpreq(); | |
64 | 59 static int newtcpdirect(struct Channel * channel); |
62 | 60 |
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61 #ifdef ENABLE_SVR_REMOTETCPFWD |
62 | 62 static const struct ChanType svr_chan_tcpremote = { |
63 1, /* sepfds */ | |
64 "forwarded-tcpip", | |
65 NULL, | |
66 NULL, | |
67 NULL, | |
68 NULL | |
69 }; | |
70 | |
71 /* At the moment this is completely used for tcp code (with the name reflecting | |
72 * that). If new request types are added, this should be replaced with code | |
73 * similar to the request-switching in chansession.c */ | |
74 void recv_msg_global_request_remotetcp() { | |
75 | |
76 unsigned char* reqname = NULL; | |
77 unsigned int namelen; | |
78 unsigned int wantreply = 0; | |
79 int ret = DROPBEAR_FAILURE; | |
80 | |
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81 TRACE(("enter recv_msg_global_request_remotetcp")) |
62 | 82 |
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83 if (svr_opts.noremotetcp || !svr_pubkey_allows_tcpfwd()) { |
165
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84 TRACE(("leave recv_msg_global_request_remotetcp: remote tcp forwarding disabled")) |
62 | 85 goto out; |
86 } | |
87 | |
88 reqname = buf_getstring(ses.payload, &namelen); | |
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89 wantreply = buf_getbool(ses.payload); |
62 | 90 |
267
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91 if (namelen > MAX_NAME_LEN) { |
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92 TRACE(("name len is wrong: %d", namelen)) |
62 | 93 goto out; |
94 } | |
95 | |
96 if (strcmp("tcpip-forward", reqname) == 0) { | |
97 ret = svr_remotetcpreq(); | |
98 } else if (strcmp("cancel-tcpip-forward", reqname) == 0) { | |
99 ret = svr_cancelremotetcp(); | |
100 } else { | |
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101 TRACE(("reqname isn't tcpip-forward: '%s'", reqname)) |
62 | 102 } |
103 | |
104 out: | |
105 if (wantreply) { | |
106 if (ret == DROPBEAR_SUCCESS) { | |
107 send_msg_request_success(); | |
108 } else { | |
109 send_msg_request_failure(); | |
110 } | |
111 } | |
112 | |
113 m_free(reqname); | |
114 | |
165
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115 TRACE(("leave recv_msg_global_request")) |
62 | 116 } |
117 | |
118 | |
119 static void send_msg_request_success() { | |
120 | |
121 CHECKCLEARTOWRITE(); | |
122 buf_putbyte(ses.writepayload, SSH_MSG_REQUEST_SUCCESS); | |
123 encrypt_packet(); | |
124 | |
125 } | |
126 | |
127 static int matchtcp(void* typedata1, void* typedata2) { | |
128 | |
129 const struct TCPListener *info1 = (struct TCPListener*)typedata1; | |
130 const struct TCPListener *info2 = (struct TCPListener*)typedata2; | |
131 | |
258
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132 return (info1->listenport == info2->listenport) |
62 | 133 && (info1->chantype == info2->chantype) |
258
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134 && (strcmp(info1->listenaddr, info2->listenaddr) == 0); |
62 | 135 } |
136 | |
137 static int svr_cancelremotetcp() { | |
138 | |
139 int ret = DROPBEAR_FAILURE; | |
140 unsigned char * bindaddr = NULL; | |
141 unsigned int addrlen; | |
142 unsigned int port; | |
143 struct Listener * listener = NULL; | |
144 struct TCPListener tcpinfo; | |
145 | |
165
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146 TRACE(("enter cancelremotetcp")) |
62 | 147 |
148 bindaddr = buf_getstring(ses.payload, &addrlen); | |
149 if (addrlen > MAX_IP_LEN) { | |
165
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150 TRACE(("addr len too long: %d", addrlen)) |
62 | 151 goto out; |
152 } | |
153 | |
154 port = buf_getint(ses.payload); | |
155 | |
258
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156 tcpinfo.sendaddr = NULL; |
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157 tcpinfo.sendport = 0; |
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158 tcpinfo.listenaddr = bindaddr; |
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159 tcpinfo.listenport = port; |
62 | 160 listener = get_listener(CHANNEL_ID_TCPFORWARDED, &tcpinfo, matchtcp); |
161 if (listener) { | |
162 remove_listener( listener ); | |
163 ret = DROPBEAR_SUCCESS; | |
164 } | |
165 | |
166 out: | |
167 m_free(bindaddr); | |
165
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168 TRACE(("leave cancelremotetcp")) |
62 | 169 return ret; |
170 } | |
171 | |
172 static int svr_remotetcpreq() { | |
173 | |
174 int ret = DROPBEAR_FAILURE; | |
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175 unsigned char * request_addr = NULL; |
62 | 176 unsigned int addrlen; |
177 struct TCPListener *tcpinfo = NULL; | |
178 unsigned int port; | |
179 | |
165
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180 TRACE(("enter remotetcpreq")) |
62 | 181 |
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182 request_addr = buf_getstring(ses.payload, &addrlen); |
62 | 183 if (addrlen > MAX_IP_LEN) { |
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184 TRACE(("addr len too long: %d", addrlen)) |
62 | 185 goto out; |
186 } | |
187 | |
188 port = buf_getint(ses.payload); | |
189 | |
190 if (port == 0) { | |
191 dropbear_log(LOG_INFO, "Server chosen tcpfwd ports are unsupported"); | |
192 goto out; | |
193 } | |
194 | |
195 if (port < 1 || port > 65535) { | |
165
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196 TRACE(("invalid port: %d", port)) |
62 | 197 goto out; |
198 } | |
199 | |
200 if (!ses.allowprivport && port < IPPORT_RESERVED) { | |
165
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201 TRACE(("can't assign port < 1024 for non-root")) |
62 | 202 goto out; |
203 } | |
204 | |
205 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener)); | |
258
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206 tcpinfo->sendaddr = NULL; |
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207 tcpinfo->sendport = 0; |
64 | 208 tcpinfo->listenport = port; |
62 | 209 tcpinfo->chantype = &svr_chan_tcpremote; |
259
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210 tcpinfo->tcp_type = forwarded; |
62 | 211 |
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212 tcpinfo->request_listenaddr = request_addr; |
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213 if (!opts.listen_fwd_all || (strcmp(request_addr, "localhost") == 0) ) { |
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214 // NULL means "localhost only" |
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215 tcpinfo->listenaddr = NULL; |
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216 } |
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217 else |
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218 { |
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219 tcpinfo->listenaddr = request_addr; |
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220 } |
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221 |
62 | 222 ret = listen_tcpfwd(tcpinfo); |
223 | |
224 out: | |
225 if (ret == DROPBEAR_FAILURE) { | |
226 /* we only free it if a listener wasn't created, since the listener | |
227 * has to remember it if it's to be cancelled */ | |
675
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228 m_free(request_addr); |
62 | 229 m_free(tcpinfo); |
230 } | |
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231 TRACE(("leave remotetcpreq")) |
62 | 232 return ret; |
233 } | |
64 | 234 |
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235 #endif /* ENABLE_SVR_REMOTETCPFWD */ |
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236 |
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237 #ifdef ENABLE_SVR_LOCALTCPFWD |
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238 |
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239 const struct ChanType svr_chan_tcpdirect = { |
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240 1, /* sepfds */ |
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241 "direct-tcpip", |
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242 newtcpdirect, /* init */ |
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243 NULL, /* checkclose */ |
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244 NULL, /* reqhandler */ |
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245 NULL /* closehandler */ |
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246 }; |
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247 |
64 | 248 /* Called upon creating a new direct tcp channel (ie we connect out to an |
249 * address */ | |
250 static int newtcpdirect(struct Channel * channel) { | |
251 | |
252 unsigned char* desthost = NULL; | |
253 unsigned int destport; | |
254 unsigned char* orighost = NULL; | |
255 unsigned int origport; | |
256 char portstring[NI_MAXSERV]; | |
257 int sock; | |
258 int len; | |
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259 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |
64 | 260 |
475
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261 if (svr_opts.nolocaltcp || !svr_pubkey_allows_tcpfwd()) { |
165
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262 TRACE(("leave newtcpdirect: local tcp forwarding disabled")) |
64 | 263 goto out; |
264 } | |
265 | |
266 desthost = buf_getstring(ses.payload, &len); | |
267 if (len > MAX_HOST_LEN) { | |
165
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268 TRACE(("leave newtcpdirect: desthost too long")) |
64 | 269 goto out; |
270 } | |
271 | |
272 destport = buf_getint(ses.payload); | |
273 | |
274 orighost = buf_getstring(ses.payload, &len); | |
275 if (len > MAX_HOST_LEN) { | |
165
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276 TRACE(("leave newtcpdirect: orighost too long")) |
64 | 277 goto out; |
278 } | |
279 | |
280 origport = buf_getint(ses.payload); | |
281 | |
282 /* best be sure */ | |
283 if (origport > 65535 || destport > 65535) { | |
165
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284 TRACE(("leave newtcpdirect: port > 65535")) |
64 | 285 goto out; |
286 } | |
287 | |
288 snprintf(portstring, sizeof(portstring), "%d", destport); | |
289 sock = connect_remote(desthost, portstring, 1, NULL); | |
290 if (sock < 0) { | |
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291 err = SSH_OPEN_CONNECT_FAILED; |
165
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292 TRACE(("leave newtcpdirect: sock failed")) |
64 | 293 goto out; |
294 } | |
295 | |
296 ses.maxfd = MAX(ses.maxfd, sock); | |
297 | |
253
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298 /* We don't set readfd, that will get set after the connection's |
64 | 299 * progress succeeds */ |
253
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300 channel->writefd = sock; |
64 | 301 channel->initconn = 1; |
302 | |
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303 err = SSH_OPEN_IN_PROGRESS; |
64 | 304 |
305 out: | |
306 m_free(desthost); | |
307 m_free(orighost); | |
165
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308 TRACE(("leave newtcpdirect: err %d", err)) |
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309 return err; |
64 | 310 } |
311 | |
673
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312 #endif /* ENABLE_SVR_LOCALTCPFWD */ |