2 * common LSM auditing functions
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>
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.
14 #include <linux/types.h>
15 #include <linux/stddef.h>
16 #include <linux/kernel.h>
17 #include <linux/gfp.h>
19 #include <linux/init.h>
22 #include <net/af_unix.h>
23 #include <linux/audit.h>
24 #include <linux/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>
35 * ipv4_skb_to_auditdata : fill auditdata from skb
37 * @ad : the audit data to fill
38 * @proto : the layer 4 protocol
42 int ipv4_skb_to_auditdata(struct sk_buff *skb,
43 struct common_audit_data *ad, u8 *proto)
52 ad->u.net->v4info.saddr = ih->saddr;
53 ad->u.net->v4info.daddr = ih->daddr;
56 *proto = ih->protocol;
57 /* non initial fragment */
58 if (ntohs(ih->frag_off) & IP_OFFSET)
61 switch (ih->protocol) {
63 struct tcphdr *th = tcp_hdr(skb);
67 ad->u.net->sport = th->source;
68 ad->u.net->dport = th->dest;
72 struct udphdr *uh = udp_hdr(skb);
76 ad->u.net->sport = uh->source;
77 ad->u.net->dport = uh->dest;
81 struct dccp_hdr *dh = dccp_hdr(skb);
85 ad->u.net->sport = dh->dccph_sport;
86 ad->u.net->dport = dh->dccph_dport;
90 struct sctphdr *sh = sctp_hdr(skb);
93 ad->u.net->sport = sh->source;
94 ad->u.net->dport = sh->dest;
102 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
104 * ipv6_skb_to_auditdata : fill auditdata from skb
106 * @ad : the audit data to fill
107 * @proto : the layer 4 protocol
109 * return 0 on success
111 int ipv6_skb_to_auditdata(struct sk_buff *skb,
112 struct common_audit_data *ad, u8 *proto)
122 ad->u.net->v6info.saddr = ip6->saddr;
123 ad->u.net->v6info.daddr = ip6->daddr;
125 /* IPv6 can have several extension header before the Transport header
127 offset = skb_network_offset(skb);
128 offset += sizeof(*ip6);
129 nexthdr = ip6->nexthdr;
130 offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
137 struct tcphdr _tcph, *th;
139 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
143 ad->u.net->sport = th->source;
144 ad->u.net->dport = th->dest;
148 struct udphdr _udph, *uh;
150 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
154 ad->u.net->sport = uh->source;
155 ad->u.net->dport = uh->dest;
159 struct dccp_hdr _dccph, *dh;
161 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
165 ad->u.net->sport = dh->dccph_sport;
166 ad->u.net->dport = dh->dccph_dport;
170 struct sctphdr _sctph, *sh;
172 sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
175 ad->u.net->sport = sh->source;
176 ad->u.net->dport = sh->dest;
187 static inline void print_ipv6_addr(struct audit_buffer *ab,
188 struct in6_addr *addr, __be16 port,
189 char *name1, char *name2)
191 if (!ipv6_addr_any(addr))
192 audit_log_format(ab, " %s=%pI6c", name1, addr);
194 audit_log_format(ab, " %s=%d", name2, ntohs(port));
197 static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
198 __be16 port, char *name1, char *name2)
201 audit_log_format(ab, " %s=%pI4", name1, &addr);
203 audit_log_format(ab, " %s=%d", name2, ntohs(port));
207 * dump_common_audit_data - helper to dump common audit data
208 * @a : common audit data
211 static void dump_common_audit_data(struct audit_buffer *ab,
212 struct common_audit_data *a)
214 struct task_struct *tsk = current;
216 audit_log_format(ab, " pid=%d comm=", tsk->pid);
217 audit_log_untrustedstring(ab, tsk->comm);
220 case LSM_AUDIT_DATA_NONE:
222 case LSM_AUDIT_DATA_IPC:
223 audit_log_format(ab, " key=%d ", a->u.ipc_id);
225 case LSM_AUDIT_DATA_CAP:
226 audit_log_format(ab, " capability=%d ", a->u.cap);
228 case LSM_AUDIT_DATA_PATH: {
231 audit_log_d_path(ab, " path=", &a->u.path);
233 inode = a->u.path.dentry->d_inode;
235 audit_log_format(ab, " dev=");
236 audit_log_untrustedstring(ab, inode->i_sb->s_id);
237 audit_log_format(ab, " ino=%lu", inode->i_ino);
241 case LSM_AUDIT_DATA_DENTRY: {
244 audit_log_format(ab, " name=");
245 audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
247 inode = a->u.dentry->d_inode;
249 audit_log_format(ab, " dev=");
250 audit_log_untrustedstring(ab, inode->i_sb->s_id);
251 audit_log_format(ab, " ino=%lu", inode->i_ino);
255 case LSM_AUDIT_DATA_INODE: {
256 struct dentry *dentry;
260 dentry = d_find_alias(inode);
262 audit_log_format(ab, " name=");
263 audit_log_untrustedstring(ab,
264 dentry->d_name.name);
267 audit_log_format(ab, " dev=");
268 audit_log_untrustedstring(ab, inode->i_sb->s_id);
269 audit_log_format(ab, " ino=%lu", inode->i_ino);
272 case LSM_AUDIT_DATA_TASK:
274 if (tsk && tsk->pid) {
275 audit_log_format(ab, " pid=%d comm=", tsk->pid);
276 audit_log_untrustedstring(ab, tsk->comm);
279 case LSM_AUDIT_DATA_NET:
281 struct sock *sk = a->u.net->sk;
286 switch (sk->sk_family) {
288 struct inet_sock *inet = inet_sk(sk);
290 print_ipv4_addr(ab, inet->inet_rcv_saddr,
293 print_ipv4_addr(ab, inet->inet_daddr,
299 struct inet_sock *inet = inet_sk(sk);
300 struct ipv6_pinfo *inet6 = inet6_sk(sk);
302 print_ipv6_addr(ab, &inet6->rcv_saddr,
305 print_ipv6_addr(ab, &inet6->daddr,
312 if (u->path.dentry) {
313 audit_log_d_path(ab, " path=", &u->path);
318 len = u->addr->len-sizeof(short);
319 p = &u->addr->name->sun_path[0];
320 audit_log_format(ab, " path=");
322 audit_log_untrustedstring(ab, p);
324 audit_log_n_hex(ab, p, len);
329 switch (a->u.net->family) {
331 print_ipv4_addr(ab, a->u.net->v4info.saddr,
334 print_ipv4_addr(ab, a->u.net->v4info.daddr,
339 print_ipv6_addr(ab, &a->u.net->v6info.saddr,
342 print_ipv6_addr(ab, &a->u.net->v6info.daddr,
347 if (a->u.net->netif > 0) {
348 struct net_device *dev;
350 /* NOTE: we always use init's namespace */
351 dev = dev_get_by_index(&init_net, a->u.net->netif);
353 audit_log_format(ab, " netif=%s", dev->name);
359 case LSM_AUDIT_DATA_KEY:
360 audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
361 if (a->u.key_struct.key_desc) {
362 audit_log_format(ab, " key_desc=");
363 audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
367 case LSM_AUDIT_DATA_KMOD:
368 audit_log_format(ab, " kmod=");
369 audit_log_untrustedstring(ab, a->u.kmod_name);
371 } /* switch (a->type) */
375 * common_lsm_audit - generic LSM auditing function
376 * @a: auxiliary audit data
377 * @pre_audit: lsm-specific pre-audit callback
378 * @post_audit: lsm-specific post-audit callback
380 * setup the audit buffer for common security information
381 * uses callback to print LSM specific information
383 void common_lsm_audit(struct common_audit_data *a,
384 void (*pre_audit)(struct audit_buffer *, void *),
385 void (*post_audit)(struct audit_buffer *, void *))
387 struct audit_buffer *ab;
391 /* we use GFP_ATOMIC so we won't sleep */
392 ab = audit_log_start(current->audit_context, GFP_ATOMIC, AUDIT_AVC);
400 dump_common_audit_data(ab, a);