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14#include <linux/types.h>
15#include <linux/stddef.h>
16#include <linux/kernel.h>
17#include <linux/gfp.h>
18#include <linux/fs.h>
19#include <linux/init.h>
20#include <net/sock.h>
21#include <linux/un.h>
22#include <net/af_unix.h>
23#include <linux/audit.h>
24#include <linux/ipv6.h>
25#include <linux/ip.h>
26#include <net/ip.h>
27#include <net/ipv6.h>
28#include <linux/tcp.h>
29#include <linux/udp.h>
30#include <linux/dccp.h>
31#include <linux/sctp.h>
32#include <linux/lsm_audit.h>
33
34
35
36
37
38
39
40
41
42int ipv4_skb_to_auditdata(struct sk_buff *skb,
43 struct common_audit_data *ad, u8 *proto)
44{
45 int ret = 0;
46 struct iphdr *ih;
47
48 ih = ip_hdr(skb);
49 if (ih == NULL)
50 return -EINVAL;
51
52 ad->u.net->v4info.saddr = ih->saddr;
53 ad->u.net->v4info.daddr = ih->daddr;
54
55 if (proto)
56 *proto = ih->protocol;
57
58 if (ntohs(ih->frag_off) & IP_OFFSET)
59 return 0;
60
61 switch (ih->protocol) {
62 case IPPROTO_TCP: {
63 struct tcphdr *th = tcp_hdr(skb);
64 if (th == NULL)
65 break;
66
67 ad->u.net->sport = th->source;
68 ad->u.net->dport = th->dest;
69 break;
70 }
71 case IPPROTO_UDP: {
72 struct udphdr *uh = udp_hdr(skb);
73 if (uh == NULL)
74 break;
75
76 ad->u.net->sport = uh->source;
77 ad->u.net->dport = uh->dest;
78 break;
79 }
80 case IPPROTO_DCCP: {
81 struct dccp_hdr *dh = dccp_hdr(skb);
82 if (dh == NULL)
83 break;
84
85 ad->u.net->sport = dh->dccph_sport;
86 ad->u.net->dport = dh->dccph_dport;
87 break;
88 }
89 case IPPROTO_SCTP: {
90 struct sctphdr *sh = sctp_hdr(skb);
91 if (sh == NULL)
92 break;
93 ad->u.net->sport = sh->source;
94 ad->u.net->dport = sh->dest;
95 break;
96 }
97 default:
98 ret = -EINVAL;
99 }
100 return ret;
101}
102#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
103
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108
109
110
111int ipv6_skb_to_auditdata(struct sk_buff *skb,
112 struct common_audit_data *ad, u8 *proto)
113{
114 int offset, ret = 0;
115 struct ipv6hdr *ip6;
116 u8 nexthdr;
117 __be16 frag_off;
118
119 ip6 = ipv6_hdr(skb);
120 if (ip6 == NULL)
121 return -EINVAL;
122 ad->u.net->v6info.saddr = ip6->saddr;
123 ad->u.net->v6info.daddr = ip6->daddr;
124 ret = 0;
125
126
127 offset = skb_network_offset(skb);
128 offset += sizeof(*ip6);
129 nexthdr = ip6->nexthdr;
130 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
131 if (offset < 0)
132 return 0;
133 if (proto)
134 *proto = nexthdr;
135 switch (nexthdr) {
136 case IPPROTO_TCP: {
137 struct tcphdr _tcph, *th;
138
139 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
140 if (th == NULL)
141 break;
142
143 ad->u.net->sport = th->source;
144 ad->u.net->dport = th->dest;
145 break;
146 }
147 case IPPROTO_UDP: {
148 struct udphdr _udph, *uh;
149
150 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
151 if (uh == NULL)
152 break;
153
154 ad->u.net->sport = uh->source;
155 ad->u.net->dport = uh->dest;
156 break;
157 }
158 case IPPROTO_DCCP: {
159 struct dccp_hdr _dccph, *dh;
160
161 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
162 if (dh == NULL)
163 break;
164
165 ad->u.net->sport = dh->dccph_sport;
166 ad->u.net->dport = dh->dccph_dport;
167 break;
168 }
169 case IPPROTO_SCTP: {
170 struct sctphdr _sctph, *sh;
171
172 sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
173 if (sh == NULL)
174 break;
175 ad->u.net->sport = sh->source;
176 ad->u.net->dport = sh->dest;
177 break;
178 }
179 default:
180 ret = -EINVAL;
181 }
182 return ret;
183}
184#endif
185
186
187static inline void print_ipv6_addr(struct audit_buffer *ab,
188 struct in6_addr *addr, __be16 port,
189 char *name1, char *name2)
190{
191 if (!ipv6_addr_any(addr))
192 audit_log_format(ab, " %s=%pI6c", name1, addr);
193 if (port)
194 audit_log_format(ab, " %s=%d", name2, ntohs(port));
195}
196
197static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
198 __be16 port, char *name1, char *name2)
199{
200 if (addr)
201 audit_log_format(ab, " %s=%pI4", name1, &addr);
202 if (port)
203 audit_log_format(ab, " %s=%d", name2, ntohs(port));
204}
205
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209
210
211static void dump_common_audit_data(struct audit_buffer *ab,
212 struct common_audit_data *a)
213{
214 struct task_struct *tsk = current;
215
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217
218
219
220
221 BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);
222
223 audit_log_format(ab, " pid=%d comm=", task_pid_nr(tsk));
224 audit_log_untrustedstring(ab, tsk->comm);
225
226 switch (a->type) {
227 case LSM_AUDIT_DATA_NONE:
228 return;
229 case LSM_AUDIT_DATA_IPC:
230 audit_log_format(ab, " key=%d ", a->u.ipc_id);
231 break;
232 case LSM_AUDIT_DATA_CAP:
233 audit_log_format(ab, " capability=%d ", a->u.cap);
234 break;
235 case LSM_AUDIT_DATA_PATH: {
236 struct inode *inode;
237
238 audit_log_d_path(ab, " path=", &a->u.path);
239
240 inode = a->u.path.dentry->d_inode;
241 if (inode) {
242 audit_log_format(ab, " dev=");
243 audit_log_untrustedstring(ab, inode->i_sb->s_id);
244 audit_log_format(ab, " ino=%lu", inode->i_ino);
245 }
246 break;
247 }
248 case LSM_AUDIT_DATA_DENTRY: {
249 struct inode *inode;
250
251 audit_log_format(ab, " name=");
252 audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
253
254 inode = a->u.dentry->d_inode;
255 if (inode) {
256 audit_log_format(ab, " dev=");
257 audit_log_untrustedstring(ab, inode->i_sb->s_id);
258 audit_log_format(ab, " ino=%lu", inode->i_ino);
259 }
260 break;
261 }
262 case LSM_AUDIT_DATA_INODE: {
263 struct dentry *dentry;
264 struct inode *inode;
265
266 inode = a->u.inode;
267 dentry = d_find_alias(inode);
268 if (dentry) {
269 audit_log_format(ab, " name=");
270 audit_log_untrustedstring(ab,
271 dentry->d_name.name);
272 dput(dentry);
273 }
274 audit_log_format(ab, " dev=");
275 audit_log_untrustedstring(ab, inode->i_sb->s_id);
276 audit_log_format(ab, " ino=%lu", inode->i_ino);
277 break;
278 }
279 case LSM_AUDIT_DATA_TASK:
280 tsk = a->u.tsk;
281 if (tsk) {
282 pid_t pid = task_pid_nr(tsk);
283 if (pid) {
284 audit_log_format(ab, " pid=%d comm=", pid);
285 audit_log_untrustedstring(ab, tsk->comm);
286 }
287 }
288 break;
289 case LSM_AUDIT_DATA_NET:
290 if (a->u.net->sk) {
291 struct sock *sk = a->u.net->sk;
292 struct unix_sock *u;
293 int len = 0;
294 char *p = NULL;
295
296 switch (sk->sk_family) {
297 case AF_INET: {
298 struct inet_sock *inet = inet_sk(sk);
299
300 print_ipv4_addr(ab, inet->inet_rcv_saddr,
301 inet->inet_sport,
302 "laddr", "lport");
303 print_ipv4_addr(ab, inet->inet_daddr,
304 inet->inet_dport,
305 "faddr", "fport");
306 break;
307 }
308#if IS_ENABLED(CONFIG_IPV6)
309 case AF_INET6: {
310 struct inet_sock *inet = inet_sk(sk);
311
312 print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
313 inet->inet_sport,
314 "laddr", "lport");
315 print_ipv6_addr(ab, &sk->sk_v6_daddr,
316 inet->inet_dport,
317 "faddr", "fport");
318 break;
319 }
320#endif
321 case AF_UNIX:
322 u = unix_sk(sk);
323 if (u->path.dentry) {
324 audit_log_d_path(ab, " path=", &u->path);
325 break;
326 }
327 if (!u->addr)
328 break;
329 len = u->addr->len-sizeof(short);
330 p = &u->addr->name->sun_path[0];
331 audit_log_format(ab, " path=");
332 if (*p)
333 audit_log_untrustedstring(ab, p);
334 else
335 audit_log_n_hex(ab, p, len);
336 break;
337 }
338 }
339
340 switch (a->u.net->family) {
341 case AF_INET:
342 print_ipv4_addr(ab, a->u.net->v4info.saddr,
343 a->u.net->sport,
344 "saddr", "src");
345 print_ipv4_addr(ab, a->u.net->v4info.daddr,
346 a->u.net->dport,
347 "daddr", "dest");
348 break;
349 case AF_INET6:
350 print_ipv6_addr(ab, &a->u.net->v6info.saddr,
351 a->u.net->sport,
352 "saddr", "src");
353 print_ipv6_addr(ab, &a->u.net->v6info.daddr,
354 a->u.net->dport,
355 "daddr", "dest");
356 break;
357 }
358 if (a->u.net->netif > 0) {
359 struct net_device *dev;
360
361
362 dev = dev_get_by_index(&init_net, a->u.net->netif);
363 if (dev) {
364 audit_log_format(ab, " netif=%s", dev->name);
365 dev_put(dev);
366 }
367 }
368 break;
369#ifdef CONFIG_KEYS
370 case LSM_AUDIT_DATA_KEY:
371 audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
372 if (a->u.key_struct.key_desc) {
373 audit_log_format(ab, " key_desc=");
374 audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
375 }
376 break;
377#endif
378 case LSM_AUDIT_DATA_KMOD:
379 audit_log_format(ab, " kmod=");
380 audit_log_untrustedstring(ab, a->u.kmod_name);
381 break;
382 }
383}
384
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388
389
390
391
392
393
394void common_lsm_audit(struct common_audit_data *a,
395 void (*pre_audit)(struct audit_buffer *, void *),
396 void (*post_audit)(struct audit_buffer *, void *))
397{
398 struct audit_buffer *ab;
399
400 if (a == NULL)
401 return;
402
403 ab = audit_log_start(current->audit_context, GFP_ATOMIC | __GFP_NOWARN,
404 AUDIT_AVC);
405
406 if (ab == NULL)
407 return;
408
409 if (pre_audit)
410 pre_audit(ab, a);
411
412 dump_common_audit_data(ab, a);
413
414 if (post_audit)
415 post_audit(ab, a);
416
417 audit_log_end(ab);
418}
419
