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Linux/net/netfilter/xt_socket.c

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  1 /*
  2  * Transparent proxy support for Linux/iptables
  3  *
  4  * Copyright (C) 2007-2008 BalaBit IT Ltd.
  5  * Author: Krisztian Kovacs
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  *
 11  */
 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 13 #include <linux/module.h>
 14 #include <linux/skbuff.h>
 15 #include <linux/netfilter/x_tables.h>
 16 #include <linux/netfilter_ipv4/ip_tables.h>
 17 #include <net/tcp.h>
 18 #include <net/udp.h>
 19 #include <net/icmp.h>
 20 #include <net/sock.h>
 21 #include <net/inet_sock.h>
 22 #include <net/netfilter/ipv4/nf_defrag_ipv4.h>
 23 
 24 #if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
 25 #define XT_SOCKET_HAVE_IPV6 1
 26 #include <linux/netfilter_ipv6/ip6_tables.h>
 27 #include <net/inet6_hashtables.h>
 28 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 29 #endif
 30 
 31 #include <linux/netfilter/xt_socket.h>
 32 
 33 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 34 #define XT_SOCKET_HAVE_CONNTRACK 1
 35 #include <net/netfilter/nf_conntrack.h>
 36 #endif
 37 
 38 static int
 39 extract_icmp4_fields(const struct sk_buff *skb,
 40                     u8 *protocol,
 41                     __be32 *raddr,
 42                     __be32 *laddr,
 43                     __be16 *rport,
 44                     __be16 *lport)
 45 {
 46         unsigned int outside_hdrlen = ip_hdrlen(skb);
 47         struct iphdr *inside_iph, _inside_iph;
 48         struct icmphdr *icmph, _icmph;
 49         __be16 *ports, _ports[2];
 50 
 51         icmph = skb_header_pointer(skb, outside_hdrlen,
 52                                    sizeof(_icmph), &_icmph);
 53         if (icmph == NULL)
 54                 return 1;
 55 
 56         switch (icmph->type) {
 57         case ICMP_DEST_UNREACH:
 58         case ICMP_SOURCE_QUENCH:
 59         case ICMP_REDIRECT:
 60         case ICMP_TIME_EXCEEDED:
 61         case ICMP_PARAMETERPROB:
 62                 break;
 63         default:
 64                 return 1;
 65         }
 66 
 67         inside_iph = skb_header_pointer(skb, outside_hdrlen +
 68                                         sizeof(struct icmphdr),
 69                                         sizeof(_inside_iph), &_inside_iph);
 70         if (inside_iph == NULL)
 71                 return 1;
 72 
 73         if (inside_iph->protocol != IPPROTO_TCP &&
 74             inside_iph->protocol != IPPROTO_UDP)
 75                 return 1;
 76 
 77         ports = skb_header_pointer(skb, outside_hdrlen +
 78                                    sizeof(struct icmphdr) +
 79                                    (inside_iph->ihl << 2),
 80                                    sizeof(_ports), &_ports);
 81         if (ports == NULL)
 82                 return 1;
 83 
 84         /* the inside IP packet is the one quoted from our side, thus
 85          * its saddr is the local address */
 86         *protocol = inside_iph->protocol;
 87         *laddr = inside_iph->saddr;
 88         *lport = ports[0];
 89         *raddr = inside_iph->daddr;
 90         *rport = ports[1];
 91 
 92         return 0;
 93 }
 94 
 95 /* "socket" match based redirection (no specific rule)
 96  * ===================================================
 97  *
 98  * There are connections with dynamic endpoints (e.g. FTP data
 99  * connection) that the user is unable to add explicit rules
100  * for. These are taken care of by a generic "socket" rule. It is
101  * assumed that the proxy application is trusted to open such
102  * connections without explicit iptables rule (except of course the
103  * generic 'socket' rule). In this case the following sockets are
104  * matched in preference order:
105  *
106  *   - match: if there's a fully established connection matching the
107  *     _packet_ tuple
108  *
109  *   - match: if there's a non-zero bound listener (possibly with a
110  *     non-local address) We don't accept zero-bound listeners, since
111  *     then local services could intercept traffic going through the
112  *     box.
113  */
114 static struct sock *
115 xt_socket_get_sock_v4(struct net *net, struct sk_buff *skb, const int doff,
116                       const u8 protocol,
117                       const __be32 saddr, const __be32 daddr,
118                       const __be16 sport, const __be16 dport,
119                       const struct net_device *in)
120 {
121         switch (protocol) {
122         case IPPROTO_TCP:
123                 return inet_lookup(net, &tcp_hashinfo, skb, doff,
124                                    saddr, sport, daddr, dport,
125                                    in->ifindex);
126         case IPPROTO_UDP:
127                 return udp4_lib_lookup(net, saddr, sport, daddr, dport,
128                                        in->ifindex);
129         }
130         return NULL;
131 }
132 
133 static bool xt_socket_sk_is_transparent(struct sock *sk)
134 {
135         switch (sk->sk_state) {
136         case TCP_TIME_WAIT:
137                 return inet_twsk(sk)->tw_transparent;
138 
139         case TCP_NEW_SYN_RECV:
140                 return inet_rsk(inet_reqsk(sk))->no_srccheck;
141 
142         default:
143                 return inet_sk(sk)->transparent;
144         }
145 }
146 
147 static struct sock *xt_socket_lookup_slow_v4(struct net *net,
148                                              const struct sk_buff *skb,
149                                              const struct net_device *indev)
150 {
151         const struct iphdr *iph = ip_hdr(skb);
152         struct sk_buff *data_skb = NULL;
153         int doff = 0;
154         __be32 uninitialized_var(daddr), uninitialized_var(saddr);
155         __be16 uninitialized_var(dport), uninitialized_var(sport);
156         u8 uninitialized_var(protocol);
157 #ifdef XT_SOCKET_HAVE_CONNTRACK
158         struct nf_conn const *ct;
159         enum ip_conntrack_info ctinfo;
160 #endif
161 
162         if (iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_TCP) {
163                 struct udphdr _hdr, *hp;
164 
165                 hp = skb_header_pointer(skb, ip_hdrlen(skb),
166                                         sizeof(_hdr), &_hdr);
167                 if (hp == NULL)
168                         return NULL;
169 
170                 protocol = iph->protocol;
171                 saddr = iph->saddr;
172                 sport = hp->source;
173                 daddr = iph->daddr;
174                 dport = hp->dest;
175                 data_skb = (struct sk_buff *)skb;
176                 doff = iph->protocol == IPPROTO_TCP ?
177                         ip_hdrlen(skb) + __tcp_hdrlen((struct tcphdr *)hp) :
178                         ip_hdrlen(skb) + sizeof(*hp);
179 
180         } else if (iph->protocol == IPPROTO_ICMP) {
181                 if (extract_icmp4_fields(skb, &protocol, &saddr, &daddr,
182                                          &sport, &dport))
183                         return NULL;
184         } else {
185                 return NULL;
186         }
187 
188 #ifdef XT_SOCKET_HAVE_CONNTRACK
189         /* Do the lookup with the original socket address in
190          * case this is a reply packet of an established
191          * SNAT-ted connection.
192          */
193         ct = nf_ct_get(skb, &ctinfo);
194         if (ct && !nf_ct_is_untracked(ct) &&
195             ((iph->protocol != IPPROTO_ICMP &&
196               ctinfo == IP_CT_ESTABLISHED_REPLY) ||
197              (iph->protocol == IPPROTO_ICMP &&
198               ctinfo == IP_CT_RELATED_REPLY)) &&
199             (ct->status & IPS_SRC_NAT_DONE)) {
200 
201                 daddr = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u3.ip;
202                 dport = (iph->protocol == IPPROTO_TCP) ?
203                         ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.tcp.port :
204                         ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
205         }
206 #endif
207 
208         return xt_socket_get_sock_v4(net, data_skb, doff, protocol, saddr,
209                                      daddr, sport, dport, indev);
210 }
211 
212 static bool
213 socket_match(const struct sk_buff *skb, struct xt_action_param *par,
214              const struct xt_socket_mtinfo1 *info)
215 {
216         struct sk_buff *pskb = (struct sk_buff *)skb;
217         struct sock *sk = skb->sk;
218 
219         if (!sk)
220                 sk = xt_socket_lookup_slow_v4(par->net, skb, par->in);
221         if (sk) {
222                 bool wildcard;
223                 bool transparent = true;
224 
225                 /* Ignore sockets listening on INADDR_ANY,
226                  * unless XT_SOCKET_NOWILDCARD is set
227                  */
228                 wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) &&
229                             sk_fullsock(sk) &&
230                             inet_sk(sk)->inet_rcv_saddr == 0);
231 
232                 /* Ignore non-transparent sockets,
233                  * if XT_SOCKET_TRANSPARENT is used
234                  */
235                 if (info->flags & XT_SOCKET_TRANSPARENT)
236                         transparent = xt_socket_sk_is_transparent(sk);
237 
238                 if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
239                     transparent)
240                         pskb->mark = sk->sk_mark;
241 
242                 if (sk != skb->sk)
243                         sock_gen_put(sk);
244 
245                 if (wildcard || !transparent)
246                         sk = NULL;
247         }
248 
249         return sk != NULL;
250 }
251 
252 static bool
253 socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par)
254 {
255         static struct xt_socket_mtinfo1 xt_info_v0 = {
256                 .flags = 0,
257         };
258 
259         return socket_match(skb, par, &xt_info_v0);
260 }
261 
262 static bool
263 socket_mt4_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
264 {
265         return socket_match(skb, par, par->matchinfo);
266 }
267 
268 #ifdef XT_SOCKET_HAVE_IPV6
269 
270 static int
271 extract_icmp6_fields(const struct sk_buff *skb,
272                      unsigned int outside_hdrlen,
273                      int *protocol,
274                      const struct in6_addr **raddr,
275                      const struct in6_addr **laddr,
276                      __be16 *rport,
277                      __be16 *lport,
278                      struct ipv6hdr *ipv6_var)
279 {
280         const struct ipv6hdr *inside_iph;
281         struct icmp6hdr *icmph, _icmph;
282         __be16 *ports, _ports[2];
283         u8 inside_nexthdr;
284         __be16 inside_fragoff;
285         int inside_hdrlen;
286 
287         icmph = skb_header_pointer(skb, outside_hdrlen,
288                                    sizeof(_icmph), &_icmph);
289         if (icmph == NULL)
290                 return 1;
291 
292         if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
293                 return 1;
294 
295         inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph),
296                                         sizeof(*ipv6_var), ipv6_var);
297         if (inside_iph == NULL)
298                 return 1;
299         inside_nexthdr = inside_iph->nexthdr;
300 
301         inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) +
302                                               sizeof(*ipv6_var),
303                                          &inside_nexthdr, &inside_fragoff);
304         if (inside_hdrlen < 0)
305                 return 1; /* hjm: Packet has no/incomplete transport layer headers. */
306 
307         if (inside_nexthdr != IPPROTO_TCP &&
308             inside_nexthdr != IPPROTO_UDP)
309                 return 1;
310 
311         ports = skb_header_pointer(skb, inside_hdrlen,
312                                    sizeof(_ports), &_ports);
313         if (ports == NULL)
314                 return 1;
315 
316         /* the inside IP packet is the one quoted from our side, thus
317          * its saddr is the local address */
318         *protocol = inside_nexthdr;
319         *laddr = &inside_iph->saddr;
320         *lport = ports[0];
321         *raddr = &inside_iph->daddr;
322         *rport = ports[1];
323 
324         return 0;
325 }
326 
327 static struct sock *
328 xt_socket_get_sock_v6(struct net *net, struct sk_buff *skb, int doff,
329                       const u8 protocol,
330                       const struct in6_addr *saddr, const struct in6_addr *daddr,
331                       const __be16 sport, const __be16 dport,
332                       const struct net_device *in)
333 {
334         switch (protocol) {
335         case IPPROTO_TCP:
336                 return inet6_lookup(net, &tcp_hashinfo, skb, doff,
337                                     saddr, sport, daddr, dport,
338                                     in->ifindex);
339         case IPPROTO_UDP:
340                 return udp6_lib_lookup(net, saddr, sport, daddr, dport,
341                                        in->ifindex);
342         }
343 
344         return NULL;
345 }
346 
347 static struct sock *xt_socket_lookup_slow_v6(struct net *net,
348                                              const struct sk_buff *skb,
349                                              const struct net_device *indev)
350 {
351         __be16 uninitialized_var(dport), uninitialized_var(sport);
352         const struct in6_addr *daddr = NULL, *saddr = NULL;
353         struct ipv6hdr *iph = ipv6_hdr(skb);
354         struct sk_buff *data_skb = NULL;
355         int doff = 0;
356         int thoff = 0, tproto;
357 
358         tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
359         if (tproto < 0) {
360                 pr_debug("unable to find transport header in IPv6 packet, dropping\n");
361                 return NULL;
362         }
363 
364         if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) {
365                 struct udphdr _hdr, *hp;
366 
367                 hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
368                 if (hp == NULL)
369                         return NULL;
370 
371                 saddr = &iph->saddr;
372                 sport = hp->source;
373                 daddr = &iph->daddr;
374                 dport = hp->dest;
375                 data_skb = (struct sk_buff *)skb;
376                 doff = tproto == IPPROTO_TCP ?
377                         thoff + __tcp_hdrlen((struct tcphdr *)hp) :
378                         thoff + sizeof(*hp);
379 
380         } else if (tproto == IPPROTO_ICMPV6) {
381                 struct ipv6hdr ipv6_var;
382 
383                 if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
384                                          &sport, &dport, &ipv6_var))
385                         return NULL;
386         } else {
387                 return NULL;
388         }
389 
390         return xt_socket_get_sock_v6(net, data_skb, doff, tproto, saddr, daddr,
391                                      sport, dport, indev);
392 }
393 
394 static bool
395 socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
396 {
397         const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
398         struct sk_buff *pskb = (struct sk_buff *)skb;
399         struct sock *sk = skb->sk;
400 
401         if (!sk)
402                 sk = xt_socket_lookup_slow_v6(par->net, skb, par->in);
403         if (sk) {
404                 bool wildcard;
405                 bool transparent = true;
406 
407                 /* Ignore sockets listening on INADDR_ANY
408                  * unless XT_SOCKET_NOWILDCARD is set
409                  */
410                 wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) &&
411                             sk_fullsock(sk) &&
412                             ipv6_addr_any(&sk->sk_v6_rcv_saddr));
413 
414                 /* Ignore non-transparent sockets,
415                  * if XT_SOCKET_TRANSPARENT is used
416                  */
417                 if (info->flags & XT_SOCKET_TRANSPARENT)
418                         transparent = xt_socket_sk_is_transparent(sk);
419 
420                 if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
421                     transparent)
422                         pskb->mark = sk->sk_mark;
423 
424                 if (sk != skb->sk)
425                         sock_gen_put(sk);
426 
427                 if (wildcard || !transparent)
428                         sk = NULL;
429         }
430 
431         return sk != NULL;
432 }
433 #endif
434 
435 static int socket_mt_v1_check(const struct xt_mtchk_param *par)
436 {
437         const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
438 
439         if (info->flags & ~XT_SOCKET_FLAGS_V1) {
440                 pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V1);
441                 return -EINVAL;
442         }
443         return 0;
444 }
445 
446 static int socket_mt_v2_check(const struct xt_mtchk_param *par)
447 {
448         const struct xt_socket_mtinfo2 *info = (struct xt_socket_mtinfo2 *) par->matchinfo;
449 
450         if (info->flags & ~XT_SOCKET_FLAGS_V2) {
451                 pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V2);
452                 return -EINVAL;
453         }
454         return 0;
455 }
456 
457 static int socket_mt_v3_check(const struct xt_mtchk_param *par)
458 {
459         const struct xt_socket_mtinfo3 *info =
460                                     (struct xt_socket_mtinfo3 *)par->matchinfo;
461 
462         if (info->flags & ~XT_SOCKET_FLAGS_V3) {
463                 pr_info("unknown flags 0x%x\n",
464                         info->flags & ~XT_SOCKET_FLAGS_V3);
465                 return -EINVAL;
466         }
467         return 0;
468 }
469 
470 static struct xt_match socket_mt_reg[] __read_mostly = {
471         {
472                 .name           = "socket",
473                 .revision       = 0,
474                 .family         = NFPROTO_IPV4,
475                 .match          = socket_mt4_v0,
476                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
477                                   (1 << NF_INET_LOCAL_IN),
478                 .me             = THIS_MODULE,
479         },
480         {
481                 .name           = "socket",
482                 .revision       = 1,
483                 .family         = NFPROTO_IPV4,
484                 .match          = socket_mt4_v1_v2_v3,
485                 .checkentry     = socket_mt_v1_check,
486                 .matchsize      = sizeof(struct xt_socket_mtinfo1),
487                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
488                                   (1 << NF_INET_LOCAL_IN),
489                 .me             = THIS_MODULE,
490         },
491 #ifdef XT_SOCKET_HAVE_IPV6
492         {
493                 .name           = "socket",
494                 .revision       = 1,
495                 .family         = NFPROTO_IPV6,
496                 .match          = socket_mt6_v1_v2_v3,
497                 .checkentry     = socket_mt_v1_check,
498                 .matchsize      = sizeof(struct xt_socket_mtinfo1),
499                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
500                                   (1 << NF_INET_LOCAL_IN),
501                 .me             = THIS_MODULE,
502         },
503 #endif
504         {
505                 .name           = "socket",
506                 .revision       = 2,
507                 .family         = NFPROTO_IPV4,
508                 .match          = socket_mt4_v1_v2_v3,
509                 .checkentry     = socket_mt_v2_check,
510                 .matchsize      = sizeof(struct xt_socket_mtinfo1),
511                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
512                                   (1 << NF_INET_LOCAL_IN),
513                 .me             = THIS_MODULE,
514         },
515 #ifdef XT_SOCKET_HAVE_IPV6
516         {
517                 .name           = "socket",
518                 .revision       = 2,
519                 .family         = NFPROTO_IPV6,
520                 .match          = socket_mt6_v1_v2_v3,
521                 .checkentry     = socket_mt_v2_check,
522                 .matchsize      = sizeof(struct xt_socket_mtinfo1),
523                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
524                                   (1 << NF_INET_LOCAL_IN),
525                 .me             = THIS_MODULE,
526         },
527 #endif
528         {
529                 .name           = "socket",
530                 .revision       = 3,
531                 .family         = NFPROTO_IPV4,
532                 .match          = socket_mt4_v1_v2_v3,
533                 .checkentry     = socket_mt_v3_check,
534                 .matchsize      = sizeof(struct xt_socket_mtinfo1),
535                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
536                                   (1 << NF_INET_LOCAL_IN),
537                 .me             = THIS_MODULE,
538         },
539 #ifdef XT_SOCKET_HAVE_IPV6
540         {
541                 .name           = "socket",
542                 .revision       = 3,
543                 .family         = NFPROTO_IPV6,
544                 .match          = socket_mt6_v1_v2_v3,
545                 .checkentry     = socket_mt_v3_check,
546                 .matchsize      = sizeof(struct xt_socket_mtinfo1),
547                 .hooks          = (1 << NF_INET_PRE_ROUTING) |
548                                   (1 << NF_INET_LOCAL_IN),
549                 .me             = THIS_MODULE,
550         },
551 #endif
552 };
553 
554 static int __init socket_mt_init(void)
555 {
556         nf_defrag_ipv4_enable();
557 #ifdef XT_SOCKET_HAVE_IPV6
558         nf_defrag_ipv6_enable();
559 #endif
560 
561         return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
562 }
563 
564 static void __exit socket_mt_exit(void)
565 {
566         xt_unregister_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
567 }
568 
569 module_init(socket_mt_init);
570 module_exit(socket_mt_exit);
571 
572 MODULE_LICENSE("GPL");
573 MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler");
574 MODULE_DESCRIPTION("x_tables socket match module");
575 MODULE_ALIAS("ipt_socket");
576 MODULE_ALIAS("ip6t_socket");
577 

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