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11#include <linux/types.h>
12#include <linux/stddef.h>
13#include <linux/kernel.h>
14#include <linux/gfp.h>
15#include <linux/fs.h>
16#include <linux/init.h>
17#include <net/sock.h>
18#include <linux/un.h>
19#include <net/af_unix.h>
20#include <linux/audit.h>
21#include <linux/ipv6.h>
22#include <linux/ip.h>
23#include <net/ip.h>
24#include <net/ipv6.h>
25#include <linux/tcp.h>
26#include <linux/udp.h>
27#include <linux/dccp.h>
28#include <linux/sctp.h>
29#include <linux/lsm_audit.h>
30#include <linux/security.h>
31
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38
39
40int ipv4_skb_to_auditdata(struct sk_buff *skb,
41 struct common_audit_data *ad, u8 *proto)
42{
43 int ret = 0;
44 struct iphdr *ih;
45
46 ih = ip_hdr(skb);
47 if (ih == NULL)
48 return -EINVAL;
49
50 ad->u.net->v4info.saddr = ih->saddr;
51 ad->u.net->v4info.daddr = ih->daddr;
52
53 if (proto)
54 *proto = ih->protocol;
55
56 if (ntohs(ih->frag_off) & IP_OFFSET)
57 return 0;
58
59 switch (ih->protocol) {
60 case IPPROTO_TCP: {
61 struct tcphdr *th = tcp_hdr(skb);
62 if (th == NULL)
63 break;
64
65 ad->u.net->sport = th->source;
66 ad->u.net->dport = th->dest;
67 break;
68 }
69 case IPPROTO_UDP: {
70 struct udphdr *uh = udp_hdr(skb);
71 if (uh == NULL)
72 break;
73
74 ad->u.net->sport = uh->source;
75 ad->u.net->dport = uh->dest;
76 break;
77 }
78 case IPPROTO_DCCP: {
79 struct dccp_hdr *dh = dccp_hdr(skb);
80 if (dh == NULL)
81 break;
82
83 ad->u.net->sport = dh->dccph_sport;
84 ad->u.net->dport = dh->dccph_dport;
85 break;
86 }
87 case IPPROTO_SCTP: {
88 struct sctphdr *sh = sctp_hdr(skb);
89 if (sh == NULL)
90 break;
91 ad->u.net->sport = sh->source;
92 ad->u.net->dport = sh->dest;
93 break;
94 }
95 default:
96 ret = -EINVAL;
97 }
98 return ret;
99}
100#if IS_ENABLED(CONFIG_IPV6)
101
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107
108
109int ipv6_skb_to_auditdata(struct sk_buff *skb,
110 struct common_audit_data *ad, u8 *proto)
111{
112 int offset, ret = 0;
113 struct ipv6hdr *ip6;
114 u8 nexthdr;
115 __be16 frag_off;
116
117 ip6 = ipv6_hdr(skb);
118 if (ip6 == NULL)
119 return -EINVAL;
120 ad->u.net->v6info.saddr = ip6->saddr;
121 ad->u.net->v6info.daddr = ip6->daddr;
122 ret = 0;
123
124
125 offset = skb_network_offset(skb);
126 offset += sizeof(*ip6);
127 nexthdr = ip6->nexthdr;
128 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
129 if (offset < 0)
130 return 0;
131 if (proto)
132 *proto = nexthdr;
133 switch (nexthdr) {
134 case IPPROTO_TCP: {
135 struct tcphdr _tcph, *th;
136
137 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
138 if (th == NULL)
139 break;
140
141 ad->u.net->sport = th->source;
142 ad->u.net->dport = th->dest;
143 break;
144 }
145 case IPPROTO_UDP: {
146 struct udphdr _udph, *uh;
147
148 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
149 if (uh == NULL)
150 break;
151
152 ad->u.net->sport = uh->source;
153 ad->u.net->dport = uh->dest;
154 break;
155 }
156 case IPPROTO_DCCP: {
157 struct dccp_hdr _dccph, *dh;
158
159 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
160 if (dh == NULL)
161 break;
162
163 ad->u.net->sport = dh->dccph_sport;
164 ad->u.net->dport = dh->dccph_dport;
165 break;
166 }
167 case IPPROTO_SCTP: {
168 struct sctphdr _sctph, *sh;
169
170 sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
171 if (sh == NULL)
172 break;
173 ad->u.net->sport = sh->source;
174 ad->u.net->dport = sh->dest;
175 break;
176 }
177 default:
178 ret = -EINVAL;
179 }
180 return ret;
181}
182#endif
183
184
185static inline void print_ipv6_addr(struct audit_buffer *ab,
186 const struct in6_addr *addr, __be16 port,
187 char *name1, char *name2)
188{
189 if (!ipv6_addr_any(addr))
190 audit_log_format(ab, " %s=%pI6c", name1, addr);
191 if (port)
192 audit_log_format(ab, " %s=%d", name2, ntohs(port));
193}
194
195static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
196 __be16 port, char *name1, char *name2)
197{
198 if (addr)
199 audit_log_format(ab, " %s=%pI4", name1, &addr);
200 if (port)
201 audit_log_format(ab, " %s=%d", name2, ntohs(port));
202}
203
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207
208
209static void dump_common_audit_data(struct audit_buffer *ab,
210 struct common_audit_data *a)
211{
212 char comm[sizeof(current->comm)];
213
214
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216
217
218
219 BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);
220
221 audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
222 audit_log_untrustedstring(ab, memcpy(comm, current->comm, sizeof(comm)));
223
224 switch (a->type) {
225 case LSM_AUDIT_DATA_NONE:
226 return;
227 case LSM_AUDIT_DATA_IPC:
228 audit_log_format(ab, " key=%d ", a->u.ipc_id);
229 break;
230 case LSM_AUDIT_DATA_CAP:
231 audit_log_format(ab, " capability=%d ", a->u.cap);
232 break;
233 case LSM_AUDIT_DATA_PATH: {
234 struct inode *inode;
235
236 audit_log_d_path(ab, " path=", &a->u.path);
237
238 inode = d_backing_inode(a->u.path.dentry);
239 if (inode) {
240 audit_log_format(ab, " dev=");
241 audit_log_untrustedstring(ab, inode->i_sb->s_id);
242 audit_log_format(ab, " ino=%lu", inode->i_ino);
243 }
244 break;
245 }
246 case LSM_AUDIT_DATA_FILE: {
247 struct inode *inode;
248
249 audit_log_d_path(ab, " path=", &a->u.file->f_path);
250
251 inode = file_inode(a->u.file);
252 if (inode) {
253 audit_log_format(ab, " dev=");
254 audit_log_untrustedstring(ab, inode->i_sb->s_id);
255 audit_log_format(ab, " ino=%lu", inode->i_ino);
256 }
257 break;
258 }
259 case LSM_AUDIT_DATA_IOCTL_OP: {
260 struct inode *inode;
261
262 audit_log_d_path(ab, " path=", &a->u.op->path);
263
264 inode = a->u.op->path.dentry->d_inode;
265 if (inode) {
266 audit_log_format(ab, " dev=");
267 audit_log_untrustedstring(ab, inode->i_sb->s_id);
268 audit_log_format(ab, " ino=%lu", inode->i_ino);
269 }
270
271 audit_log_format(ab, " ioctlcmd=0x%hx", a->u.op->cmd);
272 break;
273 }
274 case LSM_AUDIT_DATA_DENTRY: {
275 struct inode *inode;
276
277 audit_log_format(ab, " name=");
278 spin_lock(&a->u.dentry->d_lock);
279 audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
280 spin_unlock(&a->u.dentry->d_lock);
281
282 inode = d_backing_inode(a->u.dentry);
283 if (inode) {
284 audit_log_format(ab, " dev=");
285 audit_log_untrustedstring(ab, inode->i_sb->s_id);
286 audit_log_format(ab, " ino=%lu", inode->i_ino);
287 }
288 break;
289 }
290 case LSM_AUDIT_DATA_INODE: {
291 struct dentry *dentry;
292 struct inode *inode;
293
294 rcu_read_lock();
295 inode = a->u.inode;
296 dentry = d_find_alias_rcu(inode);
297 if (dentry) {
298 audit_log_format(ab, " name=");
299 spin_lock(&dentry->d_lock);
300 audit_log_untrustedstring(ab, dentry->d_name.name);
301 spin_unlock(&dentry->d_lock);
302 }
303 audit_log_format(ab, " dev=");
304 audit_log_untrustedstring(ab, inode->i_sb->s_id);
305 audit_log_format(ab, " ino=%lu", inode->i_ino);
306 rcu_read_unlock();
307 break;
308 }
309 case LSM_AUDIT_DATA_TASK: {
310 struct task_struct *tsk = a->u.tsk;
311 if (tsk) {
312 pid_t pid = task_tgid_nr(tsk);
313 if (pid) {
314 char comm[sizeof(tsk->comm)];
315 audit_log_format(ab, " opid=%d ocomm=", pid);
316 audit_log_untrustedstring(ab,
317 memcpy(comm, tsk->comm, sizeof(comm)));
318 }
319 }
320 break;
321 }
322 case LSM_AUDIT_DATA_NET:
323 if (a->u.net->sk) {
324 const struct sock *sk = a->u.net->sk;
325 struct unix_sock *u;
326 struct unix_address *addr;
327 int len = 0;
328 char *p = NULL;
329
330 switch (sk->sk_family) {
331 case AF_INET: {
332 struct inet_sock *inet = inet_sk(sk);
333
334 print_ipv4_addr(ab, inet->inet_rcv_saddr,
335 inet->inet_sport,
336 "laddr", "lport");
337 print_ipv4_addr(ab, inet->inet_daddr,
338 inet->inet_dport,
339 "faddr", "fport");
340 break;
341 }
342#if IS_ENABLED(CONFIG_IPV6)
343 case AF_INET6: {
344 struct inet_sock *inet = inet_sk(sk);
345
346 print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
347 inet->inet_sport,
348 "laddr", "lport");
349 print_ipv6_addr(ab, &sk->sk_v6_daddr,
350 inet->inet_dport,
351 "faddr", "fport");
352 break;
353 }
354#endif
355 case AF_UNIX:
356 u = unix_sk(sk);
357 addr = smp_load_acquire(&u->addr);
358 if (!addr)
359 break;
360 if (u->path.dentry) {
361 audit_log_d_path(ab, " path=", &u->path);
362 break;
363 }
364 len = addr->len-sizeof(short);
365 p = &addr->name->sun_path[0];
366 audit_log_format(ab, " path=");
367 if (*p)
368 audit_log_untrustedstring(ab, p);
369 else
370 audit_log_n_hex(ab, p, len);
371 break;
372 }
373 }
374
375 switch (a->u.net->family) {
376 case AF_INET:
377 print_ipv4_addr(ab, a->u.net->v4info.saddr,
378 a->u.net->sport,
379 "saddr", "src");
380 print_ipv4_addr(ab, a->u.net->v4info.daddr,
381 a->u.net->dport,
382 "daddr", "dest");
383 break;
384 case AF_INET6:
385 print_ipv6_addr(ab, &a->u.net->v6info.saddr,
386 a->u.net->sport,
387 "saddr", "src");
388 print_ipv6_addr(ab, &a->u.net->v6info.daddr,
389 a->u.net->dport,
390 "daddr", "dest");
391 break;
392 }
393 if (a->u.net->netif > 0) {
394 struct net_device *dev;
395
396
397 dev = dev_get_by_index(&init_net, a->u.net->netif);
398 if (dev) {
399 audit_log_format(ab, " netif=%s", dev->name);
400 dev_put(dev);
401 }
402 }
403 break;
404#ifdef CONFIG_KEYS
405 case LSM_AUDIT_DATA_KEY:
406 audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
407 if (a->u.key_struct.key_desc) {
408 audit_log_format(ab, " key_desc=");
409 audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
410 }
411 break;
412#endif
413 case LSM_AUDIT_DATA_KMOD:
414 audit_log_format(ab, " kmod=");
415 audit_log_untrustedstring(ab, a->u.kmod_name);
416 break;
417 case LSM_AUDIT_DATA_IBPKEY: {
418 struct in6_addr sbn_pfx;
419
420 memset(&sbn_pfx.s6_addr, 0,
421 sizeof(sbn_pfx.s6_addr));
422 memcpy(&sbn_pfx.s6_addr, &a->u.ibpkey->subnet_prefix,
423 sizeof(a->u.ibpkey->subnet_prefix));
424 audit_log_format(ab, " pkey=0x%x subnet_prefix=%pI6c",
425 a->u.ibpkey->pkey, &sbn_pfx);
426 break;
427 }
428 case LSM_AUDIT_DATA_IBENDPORT:
429 audit_log_format(ab, " device=%s port_num=%u",
430 a->u.ibendport->dev_name,
431 a->u.ibendport->port);
432 break;
433 case LSM_AUDIT_DATA_LOCKDOWN:
434 audit_log_format(ab, " lockdown_reason=\"%s\"",
435 lockdown_reasons[a->u.reason]);
436 break;
437 }
438}
439
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443
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445
446
447
448
449void common_lsm_audit(struct common_audit_data *a,
450 void (*pre_audit)(struct audit_buffer *, void *),
451 void (*post_audit)(struct audit_buffer *, void *))
452{
453 struct audit_buffer *ab;
454
455 if (a == NULL)
456 return;
457
458 ab = audit_log_start(audit_context(), GFP_ATOMIC | __GFP_NOWARN,
459 AUDIT_AVC);
460
461 if (ab == NULL)
462 return;
463
464 if (pre_audit)
465 pre_audit(ab, a);
466
467 dump_common_audit_data(ab, a);
468
469 if (post_audit)
470 post_audit(ab, a);
471
472 audit_log_end(ab);
473}
474
