Mercurial > dropbear
annotate svr-tcpfwd.c @ 560:52d7301e46bd agent-client
Agent forwarding works
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Thu, 30 Jul 2009 15:14:33 +0000 |
| parents | 52a644e7b8e1 |
| children | 69e98c45db7c |
| rev | line source |
|---|---|
|
74
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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 #ifdef ENABLE_SVR_REMOTETCPFWD |
| 62 | 38 |
| 39 static void send_msg_request_success(); | |
| 40 static void send_msg_request_failure(); | |
| 41 static int svr_cancelremotetcp(); | |
| 42 static int svr_remotetcpreq(); | |
| 64 | 43 static int newtcpdirect(struct Channel * channel); |
| 62 | 44 |
| 45 | |
| 46 const struct ChanType svr_chan_tcpdirect = { | |
| 47 1, /* sepfds */ | |
| 48 "direct-tcpip", | |
| 49 newtcpdirect, /* init */ | |
| 50 NULL, /* checkclose */ | |
| 51 NULL, /* reqhandler */ | |
| 52 NULL /* closehandler */ | |
| 53 }; | |
| 54 | |
| 55 static const struct ChanType svr_chan_tcpremote = { | |
| 56 1, /* sepfds */ | |
| 57 "forwarded-tcpip", | |
| 58 NULL, | |
| 59 NULL, | |
| 60 NULL, | |
| 61 NULL | |
| 62 }; | |
| 63 | |
| 64 /* At the moment this is completely used for tcp code (with the name reflecting | |
| 65 * that). If new request types are added, this should be replaced with code | |
| 66 * similar to the request-switching in chansession.c */ | |
| 67 void recv_msg_global_request_remotetcp() { | |
| 68 | |
| 69 unsigned char* reqname = NULL; | |
| 70 unsigned int namelen; | |
| 71 unsigned int wantreply = 0; | |
| 72 int ret = DROPBEAR_FAILURE; | |
| 73 | |
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74 TRACE(("enter recv_msg_global_request_remotetcp")) |
| 62 | 75 |
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76 if (svr_opts.noremotetcp || !svr_pubkey_allows_tcpfwd()) { |
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77 TRACE(("leave recv_msg_global_request_remotetcp: remote tcp forwarding disabled")) |
| 62 | 78 goto out; |
| 79 } | |
| 80 | |
| 81 reqname = buf_getstring(ses.payload, &namelen); | |
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82 wantreply = buf_getbool(ses.payload); |
| 62 | 83 |
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84 if (namelen > MAX_NAME_LEN) { |
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85 TRACE(("name len is wrong: %d", namelen)) |
| 62 | 86 goto out; |
| 87 } | |
| 88 | |
| 89 if (strcmp("tcpip-forward", reqname) == 0) { | |
| 90 ret = svr_remotetcpreq(); | |
| 91 } else if (strcmp("cancel-tcpip-forward", reqname) == 0) { | |
| 92 ret = svr_cancelremotetcp(); | |
| 93 } else { | |
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94 TRACE(("reqname isn't tcpip-forward: '%s'", reqname)) |
| 62 | 95 } |
| 96 | |
| 97 out: | |
| 98 if (wantreply) { | |
| 99 if (ret == DROPBEAR_SUCCESS) { | |
| 100 send_msg_request_success(); | |
| 101 } else { | |
| 102 send_msg_request_failure(); | |
| 103 } | |
| 104 } | |
| 105 | |
| 106 m_free(reqname); | |
| 107 | |
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108 TRACE(("leave recv_msg_global_request")) |
| 62 | 109 } |
| 110 | |
| 111 | |
| 112 static void send_msg_request_success() { | |
| 113 | |
| 114 CHECKCLEARTOWRITE(); | |
| 115 buf_putbyte(ses.writepayload, SSH_MSG_REQUEST_SUCCESS); | |
| 116 encrypt_packet(); | |
| 117 | |
| 118 } | |
| 119 | |
| 120 static void send_msg_request_failure() { | |
| 121 | |
| 122 CHECKCLEARTOWRITE(); | |
| 123 buf_putbyte(ses.writepayload, SSH_MSG_REQUEST_FAILURE); | |
| 124 encrypt_packet(); | |
| 125 | |
| 126 } | |
| 127 | |
| 128 static int matchtcp(void* typedata1, void* typedata2) { | |
| 129 | |
| 130 const struct TCPListener *info1 = (struct TCPListener*)typedata1; | |
| 131 const struct TCPListener *info2 = (struct TCPListener*)typedata2; | |
| 132 | |
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133 return (info1->listenport == info2->listenport) |
| 62 | 134 && (info1->chantype == info2->chantype) |
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135 && (strcmp(info1->listenaddr, info2->listenaddr) == 0); |
| 62 | 136 } |
| 137 | |
| 138 static int svr_cancelremotetcp() { | |
| 139 | |
| 140 int ret = DROPBEAR_FAILURE; | |
| 141 unsigned char * bindaddr = NULL; | |
| 142 unsigned int addrlen; | |
| 143 unsigned int port; | |
| 144 struct Listener * listener = NULL; | |
| 145 struct TCPListener tcpinfo; | |
| 146 | |
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147 TRACE(("enter cancelremotetcp")) |
| 62 | 148 |
| 149 bindaddr = buf_getstring(ses.payload, &addrlen); | |
| 150 if (addrlen > MAX_IP_LEN) { | |
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151 TRACE(("addr len too long: %d", addrlen)) |
| 62 | 152 goto out; |
| 153 } | |
| 154 | |
| 155 port = buf_getint(ses.payload); | |
| 156 | |
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157 tcpinfo.sendaddr = NULL; |
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158 tcpinfo.sendport = 0; |
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159 tcpinfo.listenaddr = bindaddr; |
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160 tcpinfo.listenport = port; |
| 62 | 161 listener = get_listener(CHANNEL_ID_TCPFORWARDED, &tcpinfo, matchtcp); |
| 162 if (listener) { | |
| 163 remove_listener( listener ); | |
| 164 ret = DROPBEAR_SUCCESS; | |
| 165 } | |
| 166 | |
| 167 out: | |
| 168 m_free(bindaddr); | |
|
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169 TRACE(("leave cancelremotetcp")) |
| 62 | 170 return ret; |
| 171 } | |
| 172 | |
| 173 static int svr_remotetcpreq() { | |
| 174 | |
| 175 int ret = DROPBEAR_FAILURE; | |
| 176 unsigned char * bindaddr = NULL; | |
| 177 unsigned int addrlen; | |
| 178 struct TCPListener *tcpinfo = NULL; | |
| 179 unsigned int port; | |
| 180 | |
|
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181 TRACE(("enter remotetcpreq")) |
| 62 | 182 |
| 183 bindaddr = buf_getstring(ses.payload, &addrlen); | |
| 184 if (addrlen > MAX_IP_LEN) { | |
|
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185 TRACE(("addr len too long: %d", addrlen)) |
| 62 | 186 goto out; |
| 187 } | |
| 188 | |
| 189 port = buf_getint(ses.payload); | |
| 190 | |
| 191 if (port == 0) { | |
| 192 dropbear_log(LOG_INFO, "Server chosen tcpfwd ports are unsupported"); | |
| 193 goto out; | |
| 194 } | |
| 195 | |
| 196 if (port < 1 || port > 65535) { | |
|
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197 TRACE(("invalid port: %d", port)) |
| 62 | 198 goto out; |
| 199 } | |
| 200 | |
| 201 if (!ses.allowprivport && port < IPPORT_RESERVED) { | |
|
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202 TRACE(("can't assign port < 1024 for non-root")) |
| 62 | 203 goto out; |
| 204 } | |
| 205 | |
| 206 tcpinfo = (struct TCPListener*)m_malloc(sizeof(struct TCPListener)); | |
|
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207 tcpinfo->sendaddr = NULL; |
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208 tcpinfo->sendport = 0; |
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209 tcpinfo->listenaddr = bindaddr; |
| 64 | 210 tcpinfo->listenport = port; |
| 62 | 211 tcpinfo->chantype = &svr_chan_tcpremote; |
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212 tcpinfo->tcp_type = forwarded; |
| 62 | 213 |
| 214 ret = listen_tcpfwd(tcpinfo); | |
| 215 | |
| 216 out: | |
| 217 if (ret == DROPBEAR_FAILURE) { | |
| 218 /* we only free it if a listener wasn't created, since the listener | |
| 219 * has to remember it if it's to be cancelled */ | |
| 340 | 220 m_free(bindaddr); |
| 62 | 221 m_free(tcpinfo); |
| 222 } | |
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223 TRACE(("leave remotetcpreq")) |
| 62 | 224 return ret; |
| 225 } | |
| 64 | 226 |
| 227 /* Called upon creating a new direct tcp channel (ie we connect out to an | |
| 228 * address */ | |
| 229 static int newtcpdirect(struct Channel * channel) { | |
| 230 | |
| 231 unsigned char* desthost = NULL; | |
| 232 unsigned int destport; | |
| 233 unsigned char* orighost = NULL; | |
| 234 unsigned int origport; | |
| 235 char portstring[NI_MAXSERV]; | |
| 236 int sock; | |
| 237 int len; | |
|
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238 int err = SSH_OPEN_ADMINISTRATIVELY_PROHIBITED; |
| 64 | 239 |
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240 if (svr_opts.nolocaltcp || !svr_pubkey_allows_tcpfwd()) { |
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241 TRACE(("leave newtcpdirect: local tcp forwarding disabled")) |
| 64 | 242 goto out; |
| 243 } | |
| 244 | |
| 245 desthost = buf_getstring(ses.payload, &len); | |
| 246 if (len > MAX_HOST_LEN) { | |
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247 TRACE(("leave newtcpdirect: desthost too long")) |
| 64 | 248 goto out; |
| 249 } | |
| 250 | |
| 251 destport = buf_getint(ses.payload); | |
| 252 | |
| 253 orighost = buf_getstring(ses.payload, &len); | |
| 254 if (len > MAX_HOST_LEN) { | |
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255 TRACE(("leave newtcpdirect: orighost too long")) |
| 64 | 256 goto out; |
| 257 } | |
| 258 | |
| 259 origport = buf_getint(ses.payload); | |
| 260 | |
| 261 /* best be sure */ | |
| 262 if (origport > 65535 || destport > 65535) { | |
|
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263 TRACE(("leave newtcpdirect: port > 65535")) |
| 64 | 264 goto out; |
| 265 } | |
| 266 | |
| 267 snprintf(portstring, sizeof(portstring), "%d", destport); | |
| 268 sock = connect_remote(desthost, portstring, 1, NULL); | |
| 269 if (sock < 0) { | |
|
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270 err = SSH_OPEN_CONNECT_FAILED; |
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271 TRACE(("leave newtcpdirect: sock failed")) |
| 64 | 272 goto out; |
| 273 } | |
| 274 | |
| 275 ses.maxfd = MAX(ses.maxfd, sock); | |
| 276 | |
|
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277 /* We don't set readfd, that will get set after the connection's |
| 64 | 278 * progress succeeds */ |
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279 channel->writefd = sock; |
| 64 | 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 |