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c8be6d7b | 1 | /* |
26ac0430 | 2 | * DEBUG: section 89 NAT / IP Interception |
c8be6d7b | 3 | * AUTHOR: Robert Collins |
04f87469 | 4 | * AUTHOR: Amos Jeffries |
c8be6d7b | 5 | * |
6 | * SQUID Web Proxy Cache http://www.squid-cache.org/ | |
7 | * ---------------------------------------------------------- | |
8 | * | |
9 | * Squid is the result of efforts by numerous individuals from | |
10 | * the Internet community; see the CONTRIBUTORS file for full | |
11 | * details. Many organizations have provided support for Squid's | |
12 | * development; see the SPONSORS file for full details. Squid is | |
13 | * Copyrighted (C) 2001 by the Regents of the University of | |
14 | * California; see the COPYRIGHT file for full details. Squid | |
15 | * incorporates software developed and/or copyrighted by other | |
16 | * sources; see the CREDITS file for full details. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or modify | |
19 | * it under the terms of the GNU General Public License as published by | |
20 | * the Free Software Foundation; either version 2 of the License, or | |
21 | * (at your option) any later version. | |
26ac0430 | 22 | * |
c8be6d7b | 23 | * This program is distributed in the hope that it will be useful, |
24 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | * GNU General Public License for more details. | |
26ac0430 | 27 | * |
c8be6d7b | 28 | * You should have received a copy of the GNU General Public License |
29 | * along with this program; if not, write to the Free Software | |
30 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. | |
31 | * | |
32 | */ | |
a74968c2 | 33 | #include "config.h" |
40d34a62 | 34 | #include "comm/Connection.h" |
96d89ea0 | 35 | #include "ip/Intercept.h" |
b3166404 | 36 | #include "fde.h" |
fc27cd70 | 37 | |
c8be6d7b | 38 | #if IPF_TRANSPARENT |
34ec5c62 | 39 | |
c8be6d7b | 40 | #if HAVE_SYS_IOCTL_H |
41 | #include <sys/ioctl.h> | |
42 | #endif | |
e9e7c285 | 43 | #if HAVE_NETINET_TCP_H |
c8be6d7b | 44 | #include <netinet/tcp.h> |
e9e7c285 | 45 | #endif |
46 | #if HAVE_NET_IF_H | |
c8be6d7b | 47 | #include <net/if.h> |
e9e7c285 | 48 | #endif |
b0dfd10b | 49 | #if HAVE_IPL_H |
dbc5782a | 50 | #include <ipl.h> |
51 | #elif HAVE_NETINET_IPL_H | |
52 | #include <netinet/ipl.h> | |
53 | #endif | |
c8be6d7b | 54 | #if HAVE_IP_FIL_COMPAT_H |
55 | #include <ip_fil_compat.h> | |
56 | #elif HAVE_NETINET_IP_FIL_COMPAT_H | |
57 | #include <netinet/ip_fil_compat.h> | |
58 | #elif HAVE_IP_COMPAT_H | |
59 | #include <ip_compat.h> | |
60 | #elif HAVE_NETINET_IP_COMPAT_H | |
61 | #include <netinet/ip_compat.h> | |
62 | #endif | |
63 | #if HAVE_IP_FIL_H | |
64 | #include <ip_fil.h> | |
65 | #elif HAVE_NETINET_IP_FIL_H | |
66 | #include <netinet/ip_fil.h> | |
67 | #endif | |
68 | #if HAVE_IP_NAT_H | |
69 | #include <ip_nat.h> | |
70 | #elif HAVE_NETINET_IP_NAT_H | |
71 | #include <netinet/ip_nat.h> | |
72 | #endif | |
34ec5c62 AJ |
73 | |
74 | #endif /* IPF_TRANSPARENT required headers */ | |
c8be6d7b | 75 | |
76 | #if PF_TRANSPARENT | |
c8be6d7b | 77 | #include <sys/socket.h> |
78 | #include <sys/ioctl.h> | |
79 | #include <sys/fcntl.h> | |
80 | #include <net/if.h> | |
81 | #include <netinet/in.h> | |
b0dfd10b | 82 | #if HAVE_NET_PF_PFVAR_H |
ec9909b0 AJ |
83 | #include <net/pf/pfvar.h> |
84 | #endif /* HAVE_NET_PF_PFVAR_H */ | |
b0dfd10b | 85 | #if HAVE_NET_PFVAR_H |
c8be6d7b | 86 | #include <net/pfvar.h> |
ec9909b0 | 87 | #endif /* HAVE_NET_PFVAR_H */ |
34ec5c62 | 88 | #endif /* PF_TRANSPARENT required headers */ |
c8be6d7b | 89 | |
90 | #if LINUX_NETFILTER | |
91 | #include <linux/netfilter_ipv4.h> | |
92 | #endif | |
93 | ||
0fc2952e | 94 | // single global instance for access by other components. |
b7ac5457 | 95 | Ip::Intercept Ip::Interceptor; |
0fc2952e | 96 | |
04f87469 | 97 | void |
b7ac5457 | 98 | Ip::Intercept::StopTransparency(const char *str) |
26ac0430 | 99 | { |
40d34a62 | 100 | if (transparentActive_) { |
788625af | 101 | debugs(89, DBG_IMPORTANT, "Stopping full transparency: " << str); |
40d34a62 | 102 | transparentActive_ = 0; |
788625af | 103 | } |
04f87469 AJ |
104 | } |
105 | ||
106 | void | |
b7ac5457 | 107 | Ip::Intercept::StopInterception(const char *str) |
26ac0430 | 108 | { |
40d34a62 | 109 | if (interceptActive_) { |
788625af | 110 | debugs(89, DBG_IMPORTANT, "Stopping IP interception: " << str); |
40d34a62 | 111 | interceptActive_ = 0; |
788625af | 112 | } |
04f87469 | 113 | } |
0fc2952e | 114 | |
40d34a62 AJ |
115 | bool |
116 | Ip::Intercept::NetfilterInterception(const Comm::ConnectionPointer &newConn, int silent) | |
7b0a0d1f AJ |
117 | { |
118 | #if LINUX_NETFILTER | |
40d34a62 AJ |
119 | struct sockaddr_in lookup; |
120 | socklen_t len = sizeof(struct sockaddr_in); | |
121 | newConn->local.GetSockAddr(lookup); | |
7b0a0d1f AJ |
122 | |
123 | /** \par | |
124 | * Try NAT lookup for REDIRECT or DNAT targets. */ | |
40d34a62 | 125 | if ( getsockopt(newConn->fd, IPPROTO_IP, SO_ORIGINAL_DST, &lookup, &len) != 0) { |
26ac0430 | 126 | if (!silent) { |
40d34a62 AJ |
127 | debugs(89, DBG_IMPORTANT, HERE << " NF getsockopt(SO_ORIGINAL_DST) failed on " << newConn << ": " << xstrerror()); |
128 | lastReported_ = squid_curtime; | |
7b0a0d1f | 129 | } |
40d34a62 AJ |
130 | debugs(89, 9, HERE << "address: " << newConn); |
131 | return false; | |
26ac0430 | 132 | } else { |
40d34a62 AJ |
133 | newConn->local = lookup; |
134 | debugs(89, 5, HERE << "address NAT: " << newConn); | |
135 | return true; | |
7b0a0d1f | 136 | } |
7b0a0d1f | 137 | #endif |
40d34a62 | 138 | return false; |
7b0a0d1f AJ |
139 | } |
140 | ||
40d34a62 AJ |
141 | bool |
142 | Ip::Intercept::NetfilterTransparent(const Comm::ConnectionPointer &newConn, int silent) | |
7b0a0d1f AJ |
143 | { |
144 | #if LINUX_NETFILTER | |
acaa7194 AJ |
145 | /* Trust the user configured properly. If not no harm done. |
146 | * We will simply attempt a bind outgoing on our own IP. | |
acaa7194 | 147 | */ |
40d34a62 AJ |
148 | newConn->remote.SetPort(0); // allow random outgoing port to prevent address clashes |
149 | debugs(89, 5, HERE << "address TPROXY: " << newConn); | |
150 | return true; | |
151 | #else | |
152 | return false; | |
acaa7194 | 153 | #endif |
7b0a0d1f AJ |
154 | } |
155 | ||
40d34a62 AJ |
156 | bool |
157 | Ip::Intercept::IpfwInterception(const Comm::ConnectionPointer &newConn, int silent) | |
d8b5bcbc AJ |
158 | { |
159 | #if IPFW_TRANSPARENT | |
1b76e6c1 AJ |
160 | struct sockaddr_storage lookup; |
161 | socklen_t len = sizeof(struct sockaddr_storage); | |
162 | newConn->local.GetSockAddr(lookup, AF_INET); | |
d8b5bcbc AJ |
163 | |
164 | /** \par | |
165 | * Try lookup for IPFW interception. */ | |
1b76e6c1 | 166 | if ( getsockname(newConn->fd, (struct sockaddr*)&lookup, &len) != 0 ) { |
26ac0430 | 167 | if ( !silent ) { |
d8b5bcbc | 168 | debugs(89, DBG_IMPORTANT, HERE << " IPFW getsockname(...) failed: " << xstrerror()); |
40d34a62 | 169 | lastReported_ = squid_curtime; |
d8b5bcbc | 170 | } |
40d34a62 AJ |
171 | debugs(89, 9, HERE << "address: " << newConn); |
172 | return false; | |
26ac0430 | 173 | } else { |
40d34a62 AJ |
174 | newConn->local = lookup; |
175 | debugs(89, 5, HERE << "address NAT: " << newConn); | |
176 | return true; | |
d8b5bcbc | 177 | } |
d8b5bcbc | 178 | #endif |
40d34a62 | 179 | return false; |
d8b5bcbc | 180 | } |
0fc2952e | 181 | |
40d34a62 AJ |
182 | bool |
183 | Ip::Intercept::IpfInterception(const Comm::ConnectionPointer &newConn, int silent) | |
3f38a55e | 184 | { |
f1e0717c | 185 | #if IPF_TRANSPARENT /* --enable-ipf-transparent */ |
62e76326 | 186 | |
c8be6d7b | 187 | struct natlookup natLookup; |
188 | static int natfd = -1; | |
c8be6d7b | 189 | int x; |
3f38a55e | 190 | |
c74be4ce | 191 | // all fields must be set to 0 |
dcfb239f | 192 | memset(&natLookup, 0, sizeof(natLookup)); |
c74be4ce | 193 | // for NAT lookup set local and remote IP:port's |
40d34a62 AJ |
194 | natLookup.nl_inport = htons(newConn->local.GetPort()); |
195 | newConn->local.GetInAddr(natLookup.nl_inip); | |
9a8b1816 | 196 | natLookup.nl_outport = htons(newConn->remote.GetPort()); |
40d34a62 | 197 | newConn->remote.GetInAddr(natLookup.nl_outip); |
c74be4ce | 198 | // ... and the TCP flag |
c8be6d7b | 199 | natLookup.nl_flags = IPN_TCP; |
62e76326 | 200 | |
26ac0430 | 201 | if (natfd < 0) { |
62e76326 | 202 | int save_errno; |
203 | enter_suid(); | |
dbc5782a | 204 | #ifdef IPNAT_NAME |
dbc5782a | 205 | natfd = open(IPNAT_NAME, O_RDONLY, 0); |
98a3bc99 | 206 | #else |
62e76326 | 207 | natfd = open(IPL_NAT, O_RDONLY, 0); |
98a3bc99 | 208 | #endif |
62e76326 | 209 | save_errno = errno; |
210 | leave_suid(); | |
211 | errno = save_errno; | |
c8be6d7b | 212 | } |
62e76326 | 213 | |
26ac0430 | 214 | if (natfd < 0) { |
219f8edb | 215 | if (!silent) { |
c74be4ce | 216 | debugs(89, DBG_IMPORTANT, "IPF (IPFilter) NAT open failed: " << xstrerror()); |
40d34a62 AJ |
217 | lastReported_ = squid_curtime; |
218 | return false; | |
d6026916 | 219 | } |
c8be6d7b | 220 | } |
62e76326 | 221 | |
dbc5782a | 222 | #if defined(IPFILTER_VERSION) && (IPFILTER_VERSION >= 4000027) |
c74be4ce AJ |
223 | struct ipfobj obj; |
224 | memset(&obj, 0, sizeof(obj)); | |
225 | obj.ipfo_rev = IPFILTER_VERSION; | |
226 | obj.ipfo_size = sizeof(natLookup); | |
227 | obj.ipfo_ptr = &natLookup; | |
228 | obj.ipfo_type = IPFOBJ_NATLOOKUP; | |
229 | ||
dbc5782a | 230 | x = ioctl(natfd, SIOCGNATL, &obj); |
dbc5782a | 231 | #else |
3f38a55e | 232 | /* |
dbc5782a | 233 | * IP-Filter changed the type for SIOCGNATL between |
234 | * 3.3 and 3.4. It also changed the cmd value for | |
235 | * SIOCGNATL, so at least we can detect it. We could | |
236 | * put something in configure and use ifdefs here, but | |
237 | * this seems simpler. | |
238 | */ | |
c74be4ce | 239 | static int siocgnatl_cmd = SIOCGNATL & 0xff; |
26ac0430 | 240 | if (63 == siocgnatl_cmd) { |
62e76326 | 241 | struct natlookup *nlp = &natLookup; |
242 | x = ioctl(natfd, SIOCGNATL, &nlp); | |
26ac0430 | 243 | } else { |
62e76326 | 244 | x = ioctl(natfd, SIOCGNATL, &natLookup); |
245 | } | |
246 | ||
dbc5782a | 247 | #endif |
26ac0430 | 248 | if (x < 0) { |
62e76326 | 249 | if (errno != ESRCH) { |
219f8edb | 250 | if (!silent) { |
c74be4ce | 251 | debugs(89, DBG_IMPORTANT, "IPF (IPFilter) NAT lookup failed: ioctl(SIOCGNATL) (v=" << IPFILTER_VERSION << "): " << xstrerror()); |
40d34a62 | 252 | lastReported_ = squid_curtime; |
d6026916 | 253 | } |
254 | ||
62e76326 | 255 | close(natfd); |
256 | natfd = -1; | |
257 | } | |
258 | ||
40d34a62 AJ |
259 | debugs(89, 9, HERE << "address: " << newConn); |
260 | return false; | |
26ac0430 | 261 | } else { |
40d34a62 AJ |
262 | newConn->local = natLookup.nl_realip; |
263 | newConn->local.SetPort(ntohs(natLookup.nl_realport)); | |
264 | debugs(89, 5, HERE << "address NAT: " << newConn); | |
265 | return true; | |
c8be6d7b | 266 | } |
62e76326 | 267 | |
219f8edb | 268 | #endif /* --enable-ipf-transparent */ |
40d34a62 | 269 | return false; |
219f8edb | 270 | } |
f1e0717c | 271 | |
40d34a62 AJ |
272 | bool |
273 | Ip::Intercept::PfInterception(const Comm::ConnectionPointer &newConn, int silent) | |
219f8edb | 274 | { |
51f4d36b | 275 | #if PF_TRANSPARENT /* --enable-pf-transparent */ |
62e76326 | 276 | |
3f38a55e | 277 | struct pfioc_natlook nl; |
278 | static int pffd = -1; | |
62e76326 | 279 | |
280 | if (pffd < 0) | |
d14c6ef2 | 281 | pffd = open("/dev/pf", O_RDONLY); |
62e76326 | 282 | |
26ac0430 | 283 | if (pffd < 0) { |
51f4d36b | 284 | if (!silent) { |
e9172f79 | 285 | debugs(89, DBG_IMPORTANT, HERE << "PF open failed: " << xstrerror()); |
40d34a62 | 286 | lastReported_ = squid_curtime; |
d6026916 | 287 | } |
40d34a62 | 288 | return false; |
c8be6d7b | 289 | } |
62e76326 | 290 | |
c8be6d7b | 291 | memset(&nl, 0, sizeof(struct pfioc_natlook)); |
40d34a62 AJ |
292 | newConn->remote.GetInAddr(nl.saddr.v4); |
293 | nl.sport = htons(newConn->remote.GetPort()); | |
cc192b50 | 294 | |
40d34a62 AJ |
295 | newConn->local.GetInAddr(nl.daddr.v4); |
296 | nl.dport = htons(newConn->local.GetPort()); | |
cc192b50 | 297 | |
c8be6d7b | 298 | nl.af = AF_INET; |
299 | nl.proto = IPPROTO_TCP; | |
300 | nl.direction = PF_OUT; | |
62e76326 | 301 | |
26ac0430 | 302 | if (ioctl(pffd, DIOCNATLOOK, &nl)) { |
62e76326 | 303 | if (errno != ENOENT) { |
51f4d36b | 304 | if (!silent) { |
e9172f79 | 305 | debugs(89, DBG_IMPORTANT, HERE << "PF lookup failed: ioctl(DIOCNATLOOK)"); |
40d34a62 | 306 | lastReported_ = squid_curtime; |
d6026916 | 307 | } |
62e76326 | 308 | close(pffd); |
309 | pffd = -1; | |
310 | } | |
40d34a62 AJ |
311 | debugs(89, 9, HERE << "address: " << newConn); |
312 | return false; | |
26ac0430 | 313 | } else { |
40d34a62 AJ |
314 | newConn->local = nl.rdaddr.v4; |
315 | newConn->local.SetPort(ntohs(nl.rdport)); | |
316 | debugs(89, 5, HERE << "address NAT: " << newConn); | |
317 | return true; | |
3f38a55e | 318 | } |
62e76326 | 319 | |
51f4d36b | 320 | #endif /* --enable-pf-transparent */ |
40d34a62 | 321 | return false; |
51f4d36b AJ |
322 | } |
323 | ||
40d34a62 AJ |
324 | bool |
325 | Ip::Intercept::Lookup(const Comm::ConnectionPointer &newConn, const Comm::ConnectionPointer &listenConn) | |
51f4d36b | 326 | { |
af6a12ee AJ |
327 | /* --enable-linux-netfilter */ |
328 | /* --enable-ipfw-transparent */ | |
329 | /* --enable-ipf-transparent */ | |
330 | /* --enable-pf-transparent */ | |
51f4d36b AJ |
331 | #if IPF_TRANSPARENT || LINUX_NETFILTER || IPFW_TRANSPARENT || PF_TRANSPARENT |
332 | ||
51f4d36b AJ |
333 | #if 0 |
334 | // Crop interception errors down to one per minute. | |
40d34a62 | 335 | int silent = (squid_curtime - lastReported_ > 60 ? 0 : 1); |
51f4d36b AJ |
336 | #else |
337 | // Show all interception errors. | |
338 | int silent = 0; | |
339 | #endif | |
340 | ||
40d34a62 AJ |
341 | debugs(89, 5, HERE << "address BEGIN: me/client= " << newConn->local << ", destination/me= " << newConn->remote); |
342 | ||
343 | newConn->flags |= (listenConn->flags & (COMM_TRANSPARENT|COMM_INTERCEPTION)); | |
e9172f79 | 344 | |
9bad3e09 | 345 | /* NP: try TPROXY first, its much quieter than NAT when non-matching */ |
40d34a62 AJ |
346 | if (transparentActive_ && listenConn->flags&COMM_TRANSPARENT) { |
347 | if (NetfilterTransparent(newConn, silent)) return true; | |
9bad3e09 AJ |
348 | } |
349 | ||
b9420956 | 350 | /* NAT is only available in IPv4 */ |
40d34a62 AJ |
351 | if ( !newConn->local.IsIPv4() ) return false; |
352 | if ( !newConn->remote.IsIPv4() ) return false; | |
11298d0d | 353 | |
40d34a62 | 354 | if (interceptActive_ && listenConn->flags&COMM_INTERCEPTION) { |
e9172f79 | 355 | /* NAT methods that use sock-opts to return client address */ |
40d34a62 AJ |
356 | if (NetfilterInterception(newConn, silent)) return true; |
357 | if (IpfwInterception(newConn, silent)) return true; | |
e9172f79 AJ |
358 | |
359 | /* NAT methods that use ioctl to return client address AND destination address */ | |
40d34a62 AJ |
360 | if (PfInterception(newConn, silent)) return true; |
361 | if (IpfInterception(newConn, silent)) return true; | |
51f4d36b | 362 | } |
f1e0717c | 363 | |
51f4d36b | 364 | #else /* none of the transparent options configured */ |
e9172f79 | 365 | debugs(89, DBG_IMPORTANT, "WARNING: transparent proxying not supported"); |
3f38a55e | 366 | #endif |
367 | ||
40d34a62 | 368 | return false; |
f1e0717c | 369 | } |
34ec5c62 | 370 | |
263f84f0 | 371 | bool |
b7ac5457 | 372 | Ip::Intercept::ProbeForTproxy(Ip::Address &test) |
263f84f0 AJ |
373 | { |
374 | debugs(3, 3, "Detect TPROXY support on port " << test); | |
263f84f0 AJ |
375 | |
376 | #if defined(IP_TRANSPARENT) | |
377 | ||
378 | int tos = 1; | |
379 | int tmp_sock = -1; | |
380 | ||
263f84f0 AJ |
381 | /* Probe to see if the Kernel TPROXY support is IPv6-enabled */ |
382 | if (test.IsIPv6()) { | |
383 | debugs(3, 3, "...Probing for IPv6 TPROXY support."); | |
384 | ||
385 | struct sockaddr_in6 tmp_ip6; | |
b7ac5457 | 386 | Ip::Address tmp = "::2"; |
263f84f0 AJ |
387 | tmp.SetPort(0); |
388 | tmp.GetSockAddr(tmp_ip6); | |
389 | ||
390 | if ( (tmp_sock = socket(PF_INET6, SOCK_STREAM, IPPROTO_TCP)) >= 0 && | |
f54f527e AJ |
391 | setsockopt(tmp_sock, SOL_IP, IP_TRANSPARENT, (char *)&tos, sizeof(int)) == 0 && |
392 | bind(tmp_sock, (struct sockaddr*)&tmp_ip6, sizeof(struct sockaddr_in6)) == 0 ) { | |
263f84f0 AJ |
393 | |
394 | debugs(3, 3, "IPv6 TPROXY support detected. Using."); | |
fb5bffa3 | 395 | close(tmp_sock); |
263f84f0 AJ |
396 | return true; |
397 | } | |
398 | if (tmp_sock >= 0) { | |
fb5bffa3 | 399 | close(tmp_sock); |
263f84f0 AJ |
400 | tmp_sock = -1; |
401 | } | |
402 | } | |
403 | ||
404 | if ( test.IsIPv6() && !test.SetIPv4() ) { | |
405 | debugs(3, DBG_CRITICAL, "TPROXY lacks IPv6 support for " << test ); | |
406 | return false; | |
407 | } | |
263f84f0 AJ |
408 | |
409 | /* Probe to see if the Kernel TPROXY support is IPv4-enabled (aka present) */ | |
410 | if (test.IsIPv4()) { | |
411 | debugs(3, 3, "...Probing for IPv4 TPROXY support."); | |
412 | ||
413 | struct sockaddr_in tmp_ip4; | |
b7ac5457 | 414 | Ip::Address tmp = "127.0.0.2"; |
263f84f0 AJ |
415 | tmp.SetPort(0); |
416 | tmp.GetSockAddr(tmp_ip4); | |
417 | ||
418 | if ( (tmp_sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP)) >= 0 && | |
f54f527e AJ |
419 | setsockopt(tmp_sock, SOL_IP, IP_TRANSPARENT, (char *)&tos, sizeof(int)) == 0 && |
420 | bind(tmp_sock, (struct sockaddr*)&tmp_ip4, sizeof(struct sockaddr_in)) == 0 ) { | |
263f84f0 AJ |
421 | |
422 | debugs(3, 3, "IPv4 TPROXY support detected. Using."); | |
fb5bffa3 | 423 | close(tmp_sock); |
263f84f0 AJ |
424 | return true; |
425 | } | |
426 | if (tmp_sock >= 0) { | |
fb5bffa3 | 427 | close(tmp_sock); |
263f84f0 AJ |
428 | } |
429 | } | |
430 | ||
431 | #else /* undefined IP_TRANSPARENT */ | |
432 | debugs(3, 3, "setsockopt(IP_TRANSPARENT) not supported on this platform. Disabling TPROXYv4."); | |
433 | #endif | |
263f84f0 AJ |
434 | return false; |
435 | } |