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)
121 ipv6_addr_copy(&ad->u.net.v6info.saddr, &ip6->saddr);
122 ipv6_addr_copy(&ad->u.net.v6info.daddr, &ip6->daddr);
124 /* IPv6 can have several extension header before the Transport header
126 offset = skb_network_offset(skb);
127 offset += sizeof(*ip6);
128 nexthdr = ip6->nexthdr;
129 offset = ipv6_skip_exthdr(skb, offset, &nexthdr);
136 struct tcphdr _tcph, *th;
138 th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
142 ad->u.net.sport = th->source;
143 ad->u.net.dport = th->dest;
147 struct udphdr _udph, *uh;
149 uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
153 ad->u.net.sport = uh->source;
154 ad->u.net.dport = uh->dest;
158 struct dccp_hdr _dccph, *dh;
160 dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
164 ad->u.net.sport = dh->dccph_sport;
165 ad->u.net.dport = dh->dccph_dport;
169 struct sctphdr _sctph, *sh;
171 sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
174 ad->u.net.sport = sh->source;
175 ad->u.net.dport = sh->dest;
186 static inline void print_ipv6_addr(struct audit_buffer *ab,
187 struct in6_addr *addr, __be16 port,
188 char *name1, char *name2)
190 if (!ipv6_addr_any(addr))
191 audit_log_format(ab, " %s=%pI6c", name1, addr);
193 audit_log_format(ab, " %s=%d", name2, ntohs(port));
196 static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
197 __be16 port, char *name1, char *name2)
200 audit_log_format(ab, " %s=%pI4", name1, &addr);
202 audit_log_format(ab, " %s=%d", name2, ntohs(port));
206 * dump_common_audit_data - helper to dump common audit data
207 * @a : common audit data
210 static void dump_common_audit_data(struct audit_buffer *ab,
211 struct common_audit_data *a)
213 struct task_struct *tsk = current;
217 if (tsk && tsk->pid) {
218 audit_log_format(ab, " pid=%d comm=", tsk->pid);
219 audit_log_untrustedstring(ab, tsk->comm);
223 case LSM_AUDIT_DATA_NONE:
225 case LSM_AUDIT_DATA_IPC:
226 audit_log_format(ab, " key=%d ", a->u.ipc_id);
228 case LSM_AUDIT_DATA_CAP:
229 audit_log_format(ab, " capability=%d ", a->u.cap);
231 case LSM_AUDIT_DATA_PATH: {
234 audit_log_d_path(ab, "path=", &a->u.path);
236 inode = a->u.path.dentry->d_inode;
238 audit_log_format(ab, " dev=%s ino=%lu",
243 case LSM_AUDIT_DATA_DENTRY: {
246 audit_log_format(ab, " name=");
247 audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
249 inode = a->u.dentry->d_inode;
251 audit_log_format(ab, " dev=%s ino=%lu",
256 case LSM_AUDIT_DATA_INODE: {
257 struct dentry *dentry;
261 dentry = d_find_alias(inode);
263 audit_log_format(ab, " name=");
264 audit_log_untrustedstring(ab,
265 dentry->d_name.name);
268 audit_log_format(ab, " dev=%s ino=%lu", inode->i_sb->s_id,
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,
317 audit_log_d_path(ab, "path=", &path);
322 len = u->addr->len-sizeof(short);
323 p = &u->addr->name->sun_path[0];
324 audit_log_format(ab, " path=");
326 audit_log_untrustedstring(ab, p);
328 audit_log_n_hex(ab, p, len);
333 switch (a->u.net.family) {
335 print_ipv4_addr(ab, a->u.net.v4info.saddr,
338 print_ipv4_addr(ab, a->u.net.v4info.daddr,
343 print_ipv6_addr(ab, &a->u.net.v6info.saddr,
346 print_ipv6_addr(ab, &a->u.net.v6info.daddr,
351 if (a->u.net.netif > 0) {
352 struct net_device *dev;
354 /* NOTE: we always use init's namespace */
355 dev = dev_get_by_index(&init_net, a->u.net.netif);
357 audit_log_format(ab, " netif=%s", dev->name);
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);
371 case LSM_AUDIT_DATA_KMOD:
372 audit_log_format(ab, " kmod=");
373 audit_log_untrustedstring(ab, a->u.kmod_name);
375 } /* switch (a->type) */
379 * common_lsm_audit - generic LSM auditing function
380 * @a: auxiliary audit data
382 * setup the audit buffer for common security information
383 * uses callback to print LSM specific information
385 void common_lsm_audit(struct common_audit_data *a)
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);
397 if (a->lsm_pre_audit)
398 a->lsm_pre_audit(ab, a);
400 dump_common_audit_data(ab, a);
402 if (a->lsm_post_audit)
403 a->lsm_post_audit(ab, a);