Mercurial > dropbear
annotate svr-tcpfwd.c @ 206:0d56e4b80dfb
* defined USING_LISTENERS when tcp forwarding is enabled but not
X11 or agent forwarding
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Wed, 01 Jun 2005 16:15:38 +0000 |
| parents | 161557a9dde8 |
| children | 84925eceeb13 |
| 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" | |
| 35 | |
|
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36 #ifdef ENABLE_SVR_REMOTETCPFWD |
| 62 | 37 |
| 38 static void send_msg_request_success(); | |
| 39 static void send_msg_request_failure(); | |
| 40 static int svr_cancelremotetcp(); | |
| 41 static int svr_remotetcpreq(); | |
| 64 | 42 static int newtcpdirect(struct Channel * channel); |
| 62 | 43 |
| 44 | |
| 45 const struct ChanType svr_chan_tcpdirect = { | |
| 46 1, /* sepfds */ | |
| 47 "direct-tcpip", | |
| 48 newtcpdirect, /* init */ | |
| 49 NULL, /* checkclose */ | |
| 50 NULL, /* reqhandler */ | |
| 51 NULL /* closehandler */ | |
| 52 }; | |
| 53 | |
| 54 static const struct ChanType svr_chan_tcpremote = { | |
| 55 1, /* sepfds */ | |
| 56 "forwarded-tcpip", | |
| 57 NULL, | |
| 58 NULL, | |
| 59 NULL, | |
| 60 NULL | |
| 61 }; | |
| 62 | |
| 63 /* At the moment this is completely used for tcp code (with the name reflecting | |
| 64 * that). If new request types are added, this should be replaced with code | |
| 65 * similar to the request-switching in chansession.c */ | |
| 66 void recv_msg_global_request_remotetcp() { | |
| 67 | |
| 68 unsigned char* reqname = NULL; | |
| 69 unsigned int namelen; | |
| 70 unsigned int wantreply = 0; | |
| 71 int ret = DROPBEAR_FAILURE; | |
| 72 | |
|
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73 TRACE(("enter recv_msg_global_request_remotetcp")) |
| 62 | 74 |
| 75 if (opts.noremotetcp) { | |
|
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76 TRACE(("leave recv_msg_global_request_remotetcp: remote tcp forwarding disabled")) |
| 62 | 77 goto out; |
| 78 } | |
| 79 | |
| 80 reqname = buf_getstring(ses.payload, &namelen); | |
|
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81 wantreply = buf_getbool(ses.payload); |
| 62 | 82 |
| 83 if (namelen > MAXNAMLEN) { | |
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84 TRACE(("name len is wrong: %d", namelen)) |
| 62 | 85 goto out; |
| 86 } | |
| 87 | |
| 88 if (strcmp("tcpip-forward", reqname) == 0) { | |
| 89 ret = svr_remotetcpreq(); | |
| 90 } else if (strcmp("cancel-tcpip-forward", reqname) == 0) { | |
| 91 ret = svr_cancelremotetcp(); | |
| 92 } else { | |
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93 TRACE(("reqname isn't tcpip-forward: '%s'", reqname)) |
| 62 | 94 } |
| 95 | |
| 96 out: | |
| 97 if (wantreply) { | |
| 98 if (ret == DROPBEAR_SUCCESS) { | |
| 99 send_msg_request_success(); | |
| 100 } else { | |
| 101 send_msg_request_failure(); | |
| 102 } | |
| 103 } | |
| 104 | |
| 105 m_free(reqname); | |
| 106 | |
|
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107 TRACE(("leave recv_msg_global_request")) |
| 62 | 108 } |
| 109 | |
| 110 | |
| 111 static void send_msg_request_success() { | |
| 112 | |
| 113 CHECKCLEARTOWRITE(); | |
| 114 buf_putbyte(ses.writepayload, SSH_MSG_REQUEST_SUCCESS); | |
| 115 encrypt_packet(); | |
| 116 | |
| 117 } | |
| 118 | |
| 119 static void send_msg_request_failure() { | |
| 120 | |
| 121 CHECKCLEARTOWRITE(); | |
| 122 buf_putbyte(ses.writepayload, SSH_MSG_REQUEST_FAILURE); | |
| 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 | |
|
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132 return (info1->sendport == info2->sendport) |
| 62 | 133 && (info1->chantype == info2->chantype) |
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134 && (strcmp(info1->sendaddr, info2->sendaddr) == 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 | |
|
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146 TRACE(("enter cancelremotetcp")) |
| 62 | 147 |
| 148 bindaddr = buf_getstring(ses.payload, &addrlen); | |
| 149 if (addrlen > MAX_IP_LEN) { | |
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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 | |
|
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156 tcpinfo.sendaddr = bindaddr; |
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157 tcpinfo.sendport = port; |
| 62 | 158 listener = get_listener(CHANNEL_ID_TCPFORWARDED, &tcpinfo, matchtcp); |
| 159 if (listener) { | |
| 160 remove_listener( listener ); | |
| 161 ret = DROPBEAR_SUCCESS; | |
| 162 } | |
| 163 | |
| 164 out: | |
| 165 m_free(bindaddr); | |
|
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166 TRACE(("leave cancelremotetcp")) |
| 62 | 167 return ret; |
| 168 } | |
| 169 | |
| 170 static int svr_remotetcpreq() { | |
| 171 | |
| 172 int ret = DROPBEAR_FAILURE; | |
| 173 unsigned char * bindaddr = NULL; | |
| 174 unsigned int addrlen; | |
| 175 struct TCPListener *tcpinfo = NULL; | |
| 176 unsigned int port; | |
| 177 | |
|
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178 TRACE(("enter remotetcpreq")) |
| 62 | 179 |
|
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180 /* NOTE: at this stage, we ignore bindaddr. see below and listen_tcpfwd */ |
| 62 | 181 bindaddr = buf_getstring(ses.payload, &addrlen); |
| 182 if (addrlen > MAX_IP_LEN) { | |
|
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183 TRACE(("addr len too long: %d", addrlen)) |
| 62 | 184 goto out; |
| 185 } | |
| 186 | |
| 187 port = buf_getint(ses.payload); | |
| 188 | |
| 189 if (port == 0) { | |
| 190 dropbear_log(LOG_INFO, "Server chosen tcpfwd ports are unsupported"); | |
| 191 goto out; | |
| 192 } | |
| 193 | |
| 194 if (port < 1 || port > 65535) { | |
|
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195 TRACE(("invalid port: %d", port)) |
| 62 | 196 goto out; |
| 197 } | |
| 198 | |
| 199 if (!ses.allowprivport && port < IPPORT_RESERVED) { | |
|
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200 TRACE(("can't assign port < 1024 for non-root")) |
| 62 | 201 goto out; |
| 202 } | |
| 203 | |
| 204 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener)); | |
|
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205 tcpinfo->sendaddr = bindaddr; |
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206 tcpinfo->sendport = port; |
| 64 | 207 tcpinfo->listenport = port; |
| 62 | 208 tcpinfo->chantype = &svr_chan_tcpremote; |
| 209 | |
|
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210 /* Note: bindaddr is actually ignored by listen_tcpfwd, since |
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211 * we only want to bind to localhost */ |
| 62 | 212 ret = listen_tcpfwd(tcpinfo); |
| 213 | |
| 214 out: | |
| 215 if (ret == DROPBEAR_FAILURE) { | |
| 216 /* we only free it if a listener wasn't created, since the listener | |
| 217 * has to remember it if it's to be cancelled */ | |
|
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218 m_free(tcpinfo->sendaddr); |
| 62 | 219 m_free(tcpinfo); |
| 220 } | |
|
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221 TRACE(("leave remotetcpreq")) |
| 62 | 222 return ret; |
| 223 } | |
| 64 | 224 |
| 225 /* Called upon creating a new direct tcp channel (ie we connect out to an | |
| 226 * address */ | |
| 227 static int newtcpdirect(struct Channel * channel) { | |
| 228 | |
| 229 unsigned char* desthost = NULL; | |
| 230 unsigned int destport; | |
| 231 unsigned char* orighost = NULL; | |
| 232 unsigned int origport; | |
| 233 char portstring[NI_MAXSERV]; | |
| 234 int sock; | |
| 235 int len; | |
|
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236 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |
| 64 | 237 |
| 238 if (opts.nolocaltcp) { | |
|
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239 TRACE(("leave newtcpdirect: local tcp forwarding disabled")) |
| 64 | 240 goto out; |
| 241 } | |
| 242 | |
| 243 desthost = buf_getstring(ses.payload, &len); | |
| 244 if (len > MAX_HOST_LEN) { | |
|
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245 TRACE(("leave newtcpdirect: desthost too long")) |
| 64 | 246 goto out; |
| 247 } | |
| 248 | |
| 249 destport = buf_getint(ses.payload); | |
| 250 | |
| 251 orighost = buf_getstring(ses.payload, &len); | |
| 252 if (len > MAX_HOST_LEN) { | |
|
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253 TRACE(("leave newtcpdirect: orighost too long")) |
| 64 | 254 goto out; |
| 255 } | |
| 256 | |
| 257 origport = buf_getint(ses.payload); | |
| 258 | |
| 259 /* best be sure */ | |
| 260 if (origport > 65535 || destport > 65535) { | |
|
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261 TRACE(("leave newtcpdirect: port > 65535")) |
| 64 | 262 goto out; |
| 263 } | |
| 264 | |
| 265 snprintf(portstring, sizeof(portstring), "%d", destport); | |
| 266 sock = connect_remote(desthost, portstring, 1, NULL); | |
| 267 if (sock < 0) { | |
|
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268 err = SSH_OPEN_CONNECT_FAILED; |
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269 TRACE(("leave newtcpdirect: sock failed")) |
| 64 | 270 goto out; |
| 271 } | |
| 272 | |
| 273 ses.maxfd = MAX(ses.maxfd, sock); | |
| 274 | |
| 275 /* Note that infd is actually the "outgoing" direction on the | |
| 276 * tcp connection, vice versa for outfd. | |
| 277 * We don't set outfd, that will get set after the connection's | |
| 278 * progress succeeds */ | |
| 279 channel->infd = sock; | |
| 280 channel->initconn = 1; | |
| 281 | |
|
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282 err = SSH_OPEN_IN_PROGRESS; |
| 64 | 283 |
| 284 out: | |
| 285 m_free(desthost); | |
| 286 m_free(orighost); | |
|
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287 TRACE(("leave newtcpdirect: err %d", err)) |
|
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288 return err; |
| 64 | 289 } |
| 290 | |
| 62 | 291 #endif |