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1 | /* |
2 | * common LSM auditing functions |
3 | * |
4 | * Based on code written for SELinux by : |
5 | * Stephen Smalley, <sds@epoch.ncsc.mil> |
6 | * James Morris <jmorris@redhat.com> |
7 | * Author : Etienne Basset, <etienne.basset@ensta.org> |
8 | * |
9 | * This program is free software; you can redistribute it and/or modify |
10 | * it under the terms of the GNU General Public License version 2, |
11 | * as published by the Free Software Foundation. |
12 | */ |
13 | |
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 | * ipv4_skb_to_auditdata : fill auditdata from skb |
36 | * @skb : the skb |
37 | * @ad : the audit data to fill |
38 | * @proto : the layer 4 protocol |
39 | * |
40 | * return 0 on success |
41 | */ |
42 | int 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 | /* non initial fragment */ |
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 | /** |
104 | * ipv6_skb_to_auditdata : fill auditdata from skb |
105 | * @skb : the skb |
106 | * @ad : the audit data to fill |
107 | * @proto : the layer 4 protocol |
108 | * |
109 | * return 0 on success |
110 | */ |
111 | int 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 | |
118 | ip6 = ipv6_hdr(skb); |
119 | if (ip6 == NULL) |
120 | return -EINVAL; |
121 | ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr); |
122 | ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr); |
123 | ret = 0; |
124 | /* IPv6 can have several extension header before the Transport header |
125 | * skip them */ |
126 | offset = skb_network_offset(skb); |
127 | offset += sizeof(*ip6); |
128 | nexthdr = ip6->nexthdr; |
129 | offset = ipv6_skip_exthdr(skb, offset, &nexthdr); |
130 | if (offset < 0) |
131 | return 0; |
132 | if (proto) |
133 | *proto = nexthdr; |
134 | switch (nexthdr) { |
135 | case IPPROTO_TCP: { |
136 | struct tcphdr _tcph, *th; |
137 | |
138 | th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph); |
139 | if (th == NULL) |
140 | break; |
141 | |
142 | ad->u.net.sport = th->source; |
143 | ad->u.net.dport = th->dest; |
144 | break; |
145 | } |
146 | case IPPROTO_UDP: { |
147 | struct udphdr _udph, *uh; |
148 | |
149 | uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph); |
150 | if (uh == NULL) |
151 | break; |
152 | |
153 | ad->u.net.sport = uh->source; |
154 | ad->u.net.dport = uh->dest; |
155 | break; |
156 | } |
157 | case IPPROTO_DCCP: { |
158 | struct dccp_hdr _dccph, *dh; |
159 | |
160 | dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph); |
161 | if (dh == NULL) |
162 | break; |
163 | |
164 | ad->u.net.sport = dh->dccph_sport; |
165 | ad->u.net.dport = dh->dccph_dport; |
166 | break; |
167 | } |
168 | case IPPROTO_SCTP: { |
169 | struct sctphdr _sctph, *sh; |
170 | |
171 | sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph); |
172 | if (sh == NULL) |
173 | break; |
174 | ad->u.net.sport = sh->source; |
175 | ad->u.net.dport = sh->dest; |
176 | break; |
177 | } |
178 | default: |
179 | ret = -EINVAL; |
180 | } |
181 | return ret; |
182 | } |
183 | #endif |
184 | |
185 | |
186 | static inline void print_ipv6_addr(struct audit_buffer *ab, |
187 | struct in6_addr *addr, __be16 port, |
188 | char *name1, char *name2) |
189 | { |
190 | if (!ipv6_addr_any(addr)) |
191 | audit_log_format(ab, " %s=%pI6c", name1, addr); |
192 | if (port) |
193 | audit_log_format(ab, " %s=%d", name2, ntohs(port)); |
194 | } |
195 | |
196 | static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr, |
197 | __be16 port, char *name1, char *name2) |
198 | { |
199 | if (addr) |
200 | audit_log_format(ab, " %s=%pI4", name1, &addr); |
201 | if (port) |
202 | audit_log_format(ab, " %s=%d", name2, ntohs(port)); |
203 | } |
204 | |
205 | /** |
206 | * dump_common_audit_data - helper to dump common audit data |
207 | * @a : common audit data |
208 | * |
209 | */ |
210 | static void dump_common_audit_data(struct audit_buffer *ab, |
211 | struct common_audit_data *a) |
212 | { |
213 | struct task_struct *tsk = current; |
214 | |
215 | if (a->tsk) |
216 | tsk = a->tsk; |
217 | if (tsk && tsk->pid) { |
218 | audit_log_format(ab, " pid=%d comm=", tsk->pid); |
219 | audit_log_untrustedstring(ab, tsk->comm); |
220 | } |
221 | |
222 | switch (a->type) { |
223 | case LSM_AUDIT_DATA_NONE: |
224 | return; |
225 | case LSM_AUDIT_DATA_IPC: |
226 | audit_log_format(ab, " key=%d ", a->u.ipc_id); |
227 | break; |
228 | case LSM_AUDIT_DATA_CAP: |
229 | audit_log_format(ab, " capability=%d ", a->u.cap); |
230 | break; |
231 | case LSM_AUDIT_DATA_PATH: { |
232 | struct inode *inode; |
233 | |
234 | audit_log_d_path(ab, "path=", &a->u.path); |
235 | |
236 | inode = a->u.path.dentry->d_inode; |
237 | if (inode) |
238 | audit_log_format(ab, " dev=%s ino=%lu", |
239 | inode->i_sb->s_id, |
240 | inode->i_ino); |
241 | break; |
242 | } |
243 | case LSM_AUDIT_DATA_DENTRY: { |
244 | struct inode *inode; |
245 | |
246 | audit_log_format(ab, " name="); |
247 | audit_log_untrustedstring(ab, a->u.dentry->d_name.name); |
248 | |
249 | inode = a->u.dentry->d_inode; |
250 | if (inode) |
251 | audit_log_format(ab, " dev=%s ino=%lu", |
252 | inode->i_sb->s_id, |
253 | inode->i_ino); |
254 | break; |
255 | } |
256 | case LSM_AUDIT_DATA_INODE: { |
257 | struct dentry *dentry; |
258 | struct inode *inode; |
259 | |
260 | inode = a->u.inode; |
261 | dentry = d_find_alias(inode); |
262 | if (dentry) { |
263 | audit_log_format(ab, " name="); |
264 | audit_log_untrustedstring(ab, |
265 | dentry->d_name.name); |
266 | dput(dentry); |
267 | } |
268 | audit_log_format(ab, " dev=%s ino=%lu", inode->i_sb->s_id, |
269 | inode->i_ino); |
270 | break; |
271 | } |
272 | case LSM_AUDIT_DATA_TASK: |
273 | tsk = a->u.tsk; |
274 | if (tsk && tsk->pid) { |
275 | audit_log_format(ab, " pid=%d comm=", tsk->pid); |
276 | audit_log_untrustedstring(ab, tsk->comm); |
277 | } |
278 | break; |
279 | case LSM_AUDIT_DATA_NET: |
280 | if (a->u.net.sk) { |
281 | struct sock *sk = a->u.net.sk; |
282 | struct unix_sock *u; |
283 | int len = 0; |
284 | char *p = NULL; |
285 | |
286 | switch (sk->sk_family) { |
287 | case AF_INET: { |
288 | struct inet_sock *inet = inet_sk(sk); |
289 | |
290 | print_ipv4_addr(ab, inet->inet_rcv_saddr, |
291 | inet->inet_sport, |
292 | "laddr", "lport"); |
293 | print_ipv4_addr(ab, inet->inet_daddr, |
294 | inet->inet_dport, |
295 | "faddr", "fport"); |
296 | break; |
297 | } |
298 | case AF_INET6: { |
299 | struct inet_sock *inet = inet_sk(sk); |
300 | struct ipv6_pinfo *inet6 = inet6_sk(sk); |
301 | |
302 | print_ipv6_addr(ab, &inet6->rcv_saddr, |
303 | inet->inet_sport, |
304 | "laddr", "lport"); |
305 | print_ipv6_addr(ab, &inet6->daddr, |
306 | inet->inet_dport, |
307 | "faddr", "fport"); |
308 | break; |
309 | } |
310 | case AF_UNIX: |
311 | u = unix_sk(sk); |
312 | if (u->dentry) { |
313 | struct path path = { |
314 | .dentry = u->dentry, |
315 | .mnt = u->mnt |
316 | }; |
317 | audit_log_d_path(ab, "path=", &path); |
318 | break; |
319 | } |
320 | if (!u->addr) |
321 | break; |
322 | len = u->addr->len-sizeof(short); |
323 | p = &u->addr->name->sun_path[0]; |
324 | audit_log_format(ab, " path="); |
325 | if (*p) |
326 | audit_log_untrustedstring(ab, p); |
327 | else |
328 | audit_log_n_hex(ab, p, len); |
329 | break; |
330 | } |
331 | } |
332 | |
333 | switch (a->u.net.family) { |
334 | case AF_INET: |
335 | print_ipv4_addr(ab, a->u.net.v4info.saddr, |
336 | a->u.net.sport, |
337 | "saddr", "src"); |
338 | print_ipv4_addr(ab, a->u.net.v4info.daddr, |
339 | a->u.net.dport, |
340 | "daddr", "dest"); |
341 | break; |
342 | case AF_INET6: |
343 | print_ipv6_addr(ab, &a->u.net.v6info.saddr, |
344 | a->u.net.sport, |
345 | "saddr", "src"); |
346 | print_ipv6_addr(ab, &a->u.net.v6info.daddr, |
347 | a->u.net.dport, |
348 | "daddr", "dest"); |
349 | break; |
350 | } |
351 | if (a->u.net.netif > 0) { |
352 | struct net_device *dev; |
353 | |
354 | /* NOTE: we always use init's namespace */ |
355 | dev = dev_get_by_index(&init_net, a->u.net.netif); |
356 | if (dev) { |
357 | audit_log_format(ab, " netif=%s", dev->name); |
358 | dev_put(dev); |
359 | } |
360 | } |
361 | break; |
362 | #ifdef CONFIG_KEYS |
363 | case LSM_AUDIT_DATA_KEY: |
364 | audit_log_format(ab, " key_serial=%u", a->u.key_struct.key); |
365 | if (a->u.key_struct.key_desc) { |
366 | audit_log_format(ab, " key_desc="); |
367 | audit_log_untrustedstring(ab, a->u.key_struct.key_desc); |
368 | } |
369 | break; |
370 | #endif |
371 | case LSM_AUDIT_DATA_KMOD: |
372 | audit_log_format(ab, " kmod="); |
373 | audit_log_untrustedstring(ab, a->u.kmod_name); |
374 | break; |
375 | } /* switch (a->type) */ |
376 | } |
377 | |
378 | /** |
379 | * common_lsm_audit - generic LSM auditing function |
380 | * @a: auxiliary audit data |
381 | * |
382 | * setup the audit buffer for common security information |
383 | * uses callback to print LSM specific information |
384 | */ |
385 | void common_lsm_audit(struct common_audit_data *a) |
386 | { |
387 | struct audit_buffer *ab; |
388 | |
389 | if (a == NULL) |
390 | return; |
391 | /* we use GFP_ATOMIC so we won't sleep */ |
392 | ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_AVC); |
393 | |
394 | if (ab == NULL) |
395 | return; |
396 | |
397 | if (a->lsm_pre_audit) |
398 | a->lsm_pre_audit(ab, a); |
399 | |
400 | dump_common_audit_data(ab, a); |
401 | |
402 | if (a->lsm_post_audit) |
403 | a->lsm_post_audit(ab, a); |
404 | |
405 | audit_log_end(ab); |
406 | } |
407 |
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