[linux-2.6-block.git] / security / lsm_audit.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * common LSM auditing functions
 *
 * Based on code written for SELinux by :
 *			Stephen Smalley
 * 			James Morris <jmorris@redhat.com>
 * Author : Etienne Basset, <etienne.basset@ensta.org>
 */

#include <linux/types.h>
#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <net/sock.h>
#include <linux/un.h>
#include <net/af_unix.h>
#include <linux/audit.h>
#include <linux/ipv6.h>
#include <linux/ip.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/sctp.h>
#include <linux/lsm_audit.h>
#include <linux/security.h>

/**
 * ipv4_skb_to_auditdata : fill auditdata from skb
 * @skb : the skb
 * @ad : the audit data to fill
 * @proto : the layer 4 protocol
 *
 * return  0 on success
 */
int ipv4_skb_to_auditdata(struct sk_buff *skb,
		struct common_audit_data *ad, u8 *proto)
{
	int ret = 0;
	struct iphdr *ih;

	ih = ip_hdr(skb);
	ad->u.net->v4info.saddr = ih->saddr;
	ad->u.net->v4info.daddr = ih->daddr;

	if (proto)
		*proto = ih->protocol;
	/* non initial fragment */
	if (ntohs(ih->frag_off) & IP_OFFSET)
		return 0;

	switch (ih->protocol) {
	case IPPROTO_TCP: {
		struct tcphdr *th = tcp_hdr(skb);

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}
	case IPPROTO_UDP: {
		struct udphdr *uh = udp_hdr(skb);

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}
	case IPPROTO_SCTP: {
		struct sctphdr *sh = sctp_hdr(skb);

		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
	default:
		ret = -EINVAL;
	}
	return ret;
}
#if IS_ENABLED(CONFIG_IPV6)
/**
 * ipv6_skb_to_auditdata : fill auditdata from skb
 * @skb : the skb
 * @ad : the audit data to fill
 * @proto : the layer 4 protocol
 *
 * return  0 on success
 */
int ipv6_skb_to_auditdata(struct sk_buff *skb,
		struct common_audit_data *ad, u8 *proto)
{
	int offset, ret = 0;
	struct ipv6hdr *ip6;
	u8 nexthdr;
	__be16 frag_off;

	ip6 = ipv6_hdr(skb);
	ad->u.net->v6info.saddr = ip6->saddr;
	ad->u.net->v6info.daddr = ip6->daddr;
	/* IPv6 can have several extension header before the Transport header
	 * skip them */
	offset = skb_network_offset(skb);
	offset += sizeof(*ip6);
	nexthdr = ip6->nexthdr;
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	if (offset < 0)
		return 0;
	if (proto)
		*proto = nexthdr;
	switch (nexthdr) {
	case IPPROTO_TCP: {
		struct tcphdr _tcph, *th;

		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th == NULL)
			break;

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}
	case IPPROTO_UDP: {
		struct udphdr _udph, *uh;

		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh == NULL)
			break;

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}
	case IPPROTO_SCTP: {
		struct sctphdr _sctph, *sh;

		sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
		if (sh == NULL)
			break;
		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
	default:
		ret = -EINVAL;
	}
	return ret;
}
#endif


static inline void print_ipv6_addr(struct audit_buffer *ab,
				   const struct in6_addr *addr, __be16 port,
				   const char *name1, const char *name2)
{
	if (!ipv6_addr_any(addr))
		audit_log_format(ab, " %s=%pI6c", name1, addr);
	if (port)
		audit_log_format(ab, " %s=%d", name2, ntohs(port));
}

static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
				   __be16 port, const char *name1, const char *name2)
{
	if (addr)
		audit_log_format(ab, " %s=%pI4", name1, &addr);
	if (port)
		audit_log_format(ab, " %s=%d", name2, ntohs(port));
}

/**
 * audit_log_lsm_data - helper to log common LSM audit data
 * @ab : the audit buffer
 * @a : common audit data
 */
void audit_log_lsm_data(struct audit_buffer *ab,
			const struct common_audit_data *a)
{
	/*
	 * To keep stack sizes in check force programmers to notice if they
	 * start making this union too large!  See struct lsm_network_audit
	 * as an example of how to deal with large data.
	 */
	BUILD_BUG_ON(sizeof(a->u) > sizeof(void *)*2);

	switch (a->type) {
	case LSM_AUDIT_DATA_NONE:
		return;
	case LSM_AUDIT_DATA_IPC:
		audit_log_format(ab, " ipc_key=%d ", a->u.ipc_id);
		break;
	case LSM_AUDIT_DATA_CAP:
		audit_log_format(ab, " capability=%d ", a->u.cap);
		break;
	case LSM_AUDIT_DATA_PATH: {
		struct inode *inode;

		audit_log_d_path(ab, " path=", &a->u.path);

		inode = d_backing_inode(a->u.path.dentry);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_FILE: {
		struct inode *inode;

		audit_log_d_path(ab, " path=", &a->u.file->f_path);

		inode = file_inode(a->u.file);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_IOCTL_OP: {
		struct inode *inode;

		audit_log_d_path(ab, " path=", &a->u.op->path);

		inode = a->u.op->path.dentry->d_inode;
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}

		audit_log_format(ab, " ioctlcmd=0x%hx", a->u.op->cmd);
		break;
	}
	case LSM_AUDIT_DATA_DENTRY: {
		struct inode *inode;

		audit_log_format(ab, " name=");
		spin_lock(&a->u.dentry->d_lock);
		audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
		spin_unlock(&a->u.dentry->d_lock);

		inode = d_backing_inode(a->u.dentry);
		if (inode) {
			audit_log_format(ab, " dev=");
			audit_log_untrustedstring(ab, inode->i_sb->s_id);
			audit_log_format(ab, " ino=%lu", inode->i_ino);
		}
		break;
	}
	case LSM_AUDIT_DATA_INODE: {
		struct dentry *dentry;
		struct inode *inode;

		rcu_read_lock();
		inode = a->u.inode;
		dentry = d_find_alias_rcu(inode);
		if (dentry) {
			audit_log_format(ab, " name=");
			spin_lock(&dentry->d_lock);
			audit_log_untrustedstring(ab, dentry->d_name.name);
			spin_unlock(&dentry->d_lock);
		}
		audit_log_format(ab, " dev=");
		audit_log_untrustedstring(ab, inode->i_sb->s_id);
		audit_log_format(ab, " ino=%lu", inode->i_ino);
		rcu_read_unlock();
		break;
	}
	case LSM_AUDIT_DATA_TASK: {
		struct task_struct *tsk = a->u.tsk;
		if (tsk) {
			pid_t pid = task_tgid_nr(tsk);
			if (pid) {
				char tskcomm[sizeof(tsk->comm)];
				audit_log_format(ab, " opid=%d ocomm=", pid);
				audit_log_untrustedstring(ab,
				    get_task_comm(tskcomm, tsk));
			}
		}
		break;
	}
	case LSM_AUDIT_DATA_NET:
		if (a->u.net->sk) {
			const struct sock *sk = a->u.net->sk;
			const struct unix_sock *u;
			struct unix_address *addr;
			int len = 0;
			char *p = NULL;

			switch (sk->sk_family) {
			case AF_INET: {
				const struct inet_sock *inet = inet_sk(sk);

				print_ipv4_addr(ab, inet->inet_rcv_saddr,
						inet->inet_sport,
						"laddr", "lport");
				print_ipv4_addr(ab, inet->inet_daddr,
						inet->inet_dport,
						"faddr", "fport");
				break;
			}
#if IS_ENABLED(CONFIG_IPV6)
			case AF_INET6: {
				const struct inet_sock *inet = inet_sk(sk);

				print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
						inet->inet_sport,
						"laddr", "lport");
				print_ipv6_addr(ab, &sk->sk_v6_daddr,
						inet->inet_dport,
						"faddr", "fport");
				break;
			}
#endif
			case AF_UNIX:
				u = unix_sk(sk);
				addr = smp_load_acquire(&u->addr);
				if (!addr)
					break;
				if (u->path.dentry) {
					audit_log_d_path(ab, " path=", &u->path);
					break;
				}
				len = addr->len-sizeof(short);
				p = &addr->name->sun_path[0];
				audit_log_format(ab, " path=");
				if (*p)
					audit_log_untrustedstring(ab, p);
				else
					audit_log_n_hex(ab, p, len);
				break;
			}
		}

		switch (a->u.net->family) {
		case AF_INET:
			print_ipv4_addr(ab, a->u.net->v4info.saddr,
					a->u.net->sport,
					"saddr", "src");
			print_ipv4_addr(ab, a->u.net->v4info.daddr,
					a->u.net->dport,
					"daddr", "dest");
			break;
		case AF_INET6:
			print_ipv6_addr(ab, &a->u.net->v6info.saddr,
					a->u.net->sport,
					"saddr", "src");
			print_ipv6_addr(ab, &a->u.net->v6info.daddr,
					a->u.net->dport,
					"daddr", "dest");
			break;
		}
		if (a->u.net->netif > 0) {
			struct net_device *dev;

			/* NOTE: we always use init's namespace */
			dev = dev_get_by_index(&init_net, a->u.net->netif);
			if (dev) {
				audit_log_format(ab, " netif=%s", dev->name);
				dev_put(dev);
			}
		}
		break;
#ifdef CONFIG_KEYS
	case LSM_AUDIT_DATA_KEY:
		audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
		if (a->u.key_struct.key_desc) {
			audit_log_format(ab, " key_desc=");
			audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
		}
		break;
#endif
	case LSM_AUDIT_DATA_KMOD:
		audit_log_format(ab, " kmod=");
		audit_log_untrustedstring(ab, a->u.kmod_name);
		break;
	case LSM_AUDIT_DATA_IBPKEY: {
		struct in6_addr sbn_pfx;

		memset(&sbn_pfx.s6_addr, 0,
		       sizeof(sbn_pfx.s6_addr));
		memcpy(&sbn_pfx.s6_addr, &a->u.ibpkey->subnet_prefix,
		       sizeof(a->u.ibpkey->subnet_prefix));
		audit_log_format(ab, " pkey=0x%x subnet_prefix=%pI6c",
				 a->u.ibpkey->pkey, &sbn_pfx);
		break;
	}
	case LSM_AUDIT_DATA_IBENDPORT:
		audit_log_format(ab, " device=%s port_num=%u",
				 a->u.ibendport->dev_name,
				 a->u.ibendport->port);
		break;
	case LSM_AUDIT_DATA_LOCKDOWN:
		audit_log_format(ab, " lockdown_reason=\"%s\"",
				 lockdown_reasons[a->u.reason]);
		break;
	case LSM_AUDIT_DATA_ANONINODE:
		audit_log_format(ab, " anonclass=%s", a->u.anonclass);
		break;
	case LSM_AUDIT_DATA_NLMSGTYPE:
		audit_log_format(ab, " nl-msgtype=%hu", a->u.nlmsg_type);
		break;
	} /* switch (a->type) */
}

/**
 * dump_common_audit_data - helper to dump common audit data
 * @ab : the audit buffer
 * @a : common audit data
 */
static void dump_common_audit_data(struct audit_buffer *ab,
				   const struct common_audit_data *a)
{
	char comm[sizeof(current->comm)];

	audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
	audit_log_untrustedstring(ab, get_task_comm(comm, current));
	audit_log_lsm_data(ab, a);
}

/**
 * common_lsm_audit - generic LSM auditing function
 * @a:  auxiliary audit data
 * @pre_audit: lsm-specific pre-audit callback
 * @post_audit: lsm-specific post-audit callback
 *
 * setup the audit buffer for common security information
 * uses callback to print LSM specific information
 */
void common_lsm_audit(struct common_audit_data *a,
	void (*pre_audit)(struct audit_buffer *, void *),
	void (*post_audit)(struct audit_buffer *, void *))
{
	struct audit_buffer *ab;

	if (a == NULL)
		return;
	/* we use GFP_ATOMIC so we won't sleep */
	ab = audit_log_start(audit_context(), GFP_ATOMIC | __GFP_NOWARN,
			     AUDIT_AVC);

	if (ab == NULL)
		return;

	if (pre_audit)
		pre_audit(ab, a);

	dump_common_audit_data(ab, a);

	if (post_audit)
		post_audit(ab, a);

	audit_log_end(ab);
}
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
6e837fb1 EB	2	/*
	3	* common LSM auditing functions
	4	*
	5	* Based on code written for SELinux by :
9da4f4f9	6	* Stephen Smalley
6e837fb1 EB	7	* James Morris <jmorris@redhat.com>
6e837fb1 EB	8	* Author : Etienne Basset, <etienne.basset@ensta.org>
6e837fb1 EB	9	*/
	10
	11	#include <linux/types.h>
	12	#include <linux/stddef.h>
	13	#include <linux/kernel.h>
5a0e3ad6	14	#include <linux/gfp.h>
6e837fb1 EB	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>
6e837fb1 EB	27	#include <linux/sctp.h>
6e837fb1 EB	28	#include <linux/lsm_audit.h>
59438b46	29	#include <linux/security.h>
6e837fb1 EB	30
	31	/**
	32	* ipv4_skb_to_auditdata : fill auditdata from skb
	33	* @skb : the skb
	34	* @ad : the audit data to fill
	35	* @proto : the layer 4 protocol
	36	*
	37	* return 0 on success
	38	*/
	39	int ipv4_skb_to_auditdata(struct sk_buff *skb,
	40	struct common_audit_data ad, u8 proto)
	41	{
	42	int ret = 0;
	43	struct iphdr *ih;
	44
	45	ih = ip_hdr(skb);
48c62af6 EP	46	ad->u.net->v4info.saddr = ih->saddr;
48c62af6 EP	47	ad->u.net->v4info.daddr = ih->daddr;
6e837fb1 EB	48
	49	if (proto)
	50	*proto = ih->protocol;
	51	/* non initial fragment */
	52	if (ntohs(ih->frag_off) & IP_OFFSET)
	53	return 0;
	54
	55	switch (ih->protocol) {
	56	case IPPROTO_TCP: {
	57	struct tcphdr *th = tcp_hdr(skb);
6e837fb1	58
48c62af6 EP	59	ad->u.net->sport = th->source;
48c62af6 EP	60	ad->u.net->dport = th->dest;
6e837fb1 EB	61	break;
	62	}
	63	case IPPROTO_UDP: {
	64	struct udphdr *uh = udp_hdr(skb);
6e837fb1	65
48c62af6 EP	66	ad->u.net->sport = uh->source;
48c62af6 EP	67	ad->u.net->dport = uh->dest;
6e837fb1 EB	68	break;
6e837fb1 EB	69	}
6e837fb1 EB	70	case IPPROTO_SCTP: {
6e837fb1 EB	71	struct sctphdr *sh = sctp_hdr(skb);
4847c0eb	72
48c62af6 EP	73	ad->u.net->sport = sh->source;
48c62af6 EP	74	ad->u.net->dport = sh->dest;
6e837fb1 EB	75	break;
	76	}
	77	default:
	78	ret = -EINVAL;
	79	}
	80	return ret;
	81	}
1a93a6ea	82	#if IS_ENABLED(CONFIG_IPV6)
6e837fb1 EB	83	/**
	84	* ipv6_skb_to_auditdata : fill auditdata from skb
	85	* @skb : the skb
	86	* @ad : the audit data to fill
	87	* @proto : the layer 4 protocol
	88	*
	89	* return 0 on success
	90	*/
	91	int ipv6_skb_to_auditdata(struct sk_buff *skb,
	92	struct common_audit_data ad, u8 proto)
	93	{
	94	int offset, ret = 0;
	95	struct ipv6hdr *ip6;
	96	u8 nexthdr;
75f2811c	97	__be16 frag_off;
6e837fb1 EB	98
6e837fb1 EB	99	ip6 = ipv6_hdr(skb);
48c62af6 EP	100	ad->u.net->v6info.saddr = ip6->saddr;
48c62af6 EP	101	ad->u.net->v6info.daddr = ip6->daddr;
6e837fb1 EB	102	/* IPv6 can have several extension header before the Transport header
	103	* skip them */
	104	offset = skb_network_offset(skb);
	105	offset += sizeof(*ip6);
	106	nexthdr = ip6->nexthdr;
75f2811c	107	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
6e837fb1 EB	108	if (offset < 0)
	109	return 0;
	110	if (proto)
	111	*proto = nexthdr;
	112	switch (nexthdr) {
	113	case IPPROTO_TCP: {
	114	struct tcphdr _tcph, *th;
	115
	116	th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
	117	if (th == NULL)
	118	break;
	119
48c62af6 EP	120	ad->u.net->sport = th->source;
48c62af6 EP	121	ad->u.net->dport = th->dest;
6e837fb1 EB	122	break;
	123	}
	124	case IPPROTO_UDP: {
	125	struct udphdr _udph, *uh;
	126
	127	uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
	128	if (uh == NULL)
	129	break;
	130
48c62af6 EP	131	ad->u.net->sport = uh->source;
48c62af6 EP	132	ad->u.net->dport = uh->dest;
6e837fb1 EB	133	break;
6e837fb1 EB	134	}
6e837fb1 EB	135	case IPPROTO_SCTP: {
	136	struct sctphdr _sctph, *sh;
	137
	138	sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
	139	if (sh == NULL)
	140	break;
48c62af6 EP	141	ad->u.net->sport = sh->source;
48c62af6 EP	142	ad->u.net->dport = sh->dest;
6e837fb1 EB	143	break;
	144	}
	145	default:
	146	ret = -EINVAL;
	147	}
	148	return ret;
	149	}
	150	#endif
	151
	152
	153	static inline void print_ipv6_addr(struct audit_buffer *ab,
41dd9596	154	const struct in6_addr *addr, __be16 port,
b0966c7c	155	const char name1, const char name2)
6e837fb1 EB	156	{
6e837fb1 EB	157	if (!ipv6_addr_any(addr))
d8116591	158	audit_log_format(ab, " %s=%pI6c", name1, addr);
6e837fb1 EB	159	if (port)
	160	audit_log_format(ab, " %s=%d", name2, ntohs(port));
	161	}
	162
	163	static inline void print_ipv4_addr(struct audit_buffer *ab, __be32 addr,
b0966c7c	164	__be16 port, const char name1, const char name2)
6e837fb1 EB	165	{
	166	if (addr)
	167	audit_log_format(ab, " %s=%pI4", name1, &addr);
	168	if (port)
	169	audit_log_format(ab, " %s=%d", name2, ntohs(port));
	170	}
	171
	172	/**
9b08a166	173	* audit_log_lsm_data - helper to log common LSM audit data
610b17b0	174	* @ab : the audit buffer
6e837fb1	175	* @a : common audit data
6e837fb1	176	*/
9b08a166 MS	177	void audit_log_lsm_data(struct audit_buffer *ab,
9b08a166 MS	178	const struct common_audit_data *a)
6e837fb1	179	{
07f62eb6	180	/*
4432b507	181	* To keep stack sizes in check force programmers to notice if they
07f62eb6 EP	182	* start making this union too large! See struct lsm_network_audit
	183	* as an example of how to deal with large data.
	184	*/
	185	BUILD_BUG_ON(sizeof(a->u) > sizeof(void )2);
	186
6e837fb1	187	switch (a->type) {
cb84aa9b	188	case LSM_AUDIT_DATA_NONE:
2bf49690	189	return;
6e837fb1	190	case LSM_AUDIT_DATA_IPC:
8e71168e	191	audit_log_format(ab, " ipc_key=%d ", a->u.ipc_id);
6e837fb1 EB	192	break;
	193	case LSM_AUDIT_DATA_CAP:
	194	audit_log_format(ab, " capability=%d ", a->u.cap);
	195	break;
f48b7399	196	case LSM_AUDIT_DATA_PATH: {
f48b7399 EP	197	struct inode *inode;
f48b7399 EP	198
c158a35c	199	audit_log_d_path(ab, " path=", &a->u.path);
a269434d	200
c6f493d6	201	inode = d_backing_inode(a->u.path.dentry);
41fdc305 KC	202	if (inode) {
	203	audit_log_format(ab, " dev=");
	204	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	205	audit_log_format(ab, " ino=%lu", inode->i_ino);
	206	}
a269434d EP	207	break;
a269434d EP	208	}
43af5de7 VG	209	case LSM_AUDIT_DATA_FILE: {
	210	struct inode *inode;
	211
	212	audit_log_d_path(ab, " path=", &a->u.file->f_path);
	213
	214	inode = file_inode(a->u.file);
	215	if (inode) {
	216	audit_log_format(ab, " dev=");
	217	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	218	audit_log_format(ab, " ino=%lu", inode->i_ino);
	219	}
	220	break;
	221	}
671a2781 JVS	222	case LSM_AUDIT_DATA_IOCTL_OP: {
	223	struct inode *inode;
	224
	225	audit_log_d_path(ab, " path=", &a->u.op->path);
	226
	227	inode = a->u.op->path.dentry->d_inode;
	228	if (inode) {
	229	audit_log_format(ab, " dev=");
	230	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	231	audit_log_format(ab, " ino=%lu", inode->i_ino);
	232	}
	233
8b31f456	234	audit_log_format(ab, " ioctlcmd=0x%hx", a->u.op->cmd);
671a2781 JVS	235	break;
671a2781 JVS	236	}
a269434d EP	237	case LSM_AUDIT_DATA_DENTRY: {
	238	struct inode *inode;
	239
	240	audit_log_format(ab, " name=");
d36a1dd9	241	spin_lock(&a->u.dentry->d_lock);
a269434d	242	audit_log_untrustedstring(ab, a->u.dentry->d_name.name);
d36a1dd9	243	spin_unlock(&a->u.dentry->d_lock);
a269434d	244
c6f493d6	245	inode = d_backing_inode(a->u.dentry);
41fdc305 KC	246	if (inode) {
	247	audit_log_format(ab, " dev=");
	248	audit_log_untrustedstring(ab, inode->i_sb->s_id);
	249	audit_log_format(ab, " ino=%lu", inode->i_ino);
	250	}
6e837fb1	251	break;
f48b7399 EP	252	}
	253	case LSM_AUDIT_DATA_INODE: {
	254	struct dentry *dentry;
	255	struct inode *inode;
	256
23d8f5b6	257	rcu_read_lock();
f48b7399	258	inode = a->u.inode;
23d8f5b6	259	dentry = d_find_alias_rcu(inode);
f48b7399 EP	260	if (dentry) {
f48b7399 EP	261	audit_log_format(ab, " name=");
d36a1dd9 AV	262	spin_lock(&dentry->d_lock);
	263	audit_log_untrustedstring(ab, dentry->d_name.name);
	264	spin_unlock(&dentry->d_lock);
f48b7399	265	}
41fdc305 KC	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);
23d8f5b6	269	rcu_read_unlock();
f48b7399 EP	270	break;
f48b7399 EP	271	}
5deeb5ce RGB	272	case LSM_AUDIT_DATA_TASK: {
5deeb5ce RGB	273	struct task_struct *tsk = a->u.tsk;
f1dc4867	274	if (tsk) {
fa2bea2f	275	pid_t pid = task_tgid_nr(tsk);
f1dc4867	276	if (pid) {
b00083ae	277	char tskcomm[sizeof(tsk->comm)];
5c5bc97e	278	audit_log_format(ab, " opid=%d ocomm=", pid);
5deeb5ce	279	audit_log_untrustedstring(ab,
b00083ae	280	get_task_comm(tskcomm, tsk));
f1dc4867	281	}
6e837fb1 EB	282	}
6e837fb1 EB	283	break;
5deeb5ce	284	}
6e837fb1	285	case LSM_AUDIT_DATA_NET:
48c62af6	286	if (a->u.net->sk) {
41dd9596	287	const struct sock *sk = a->u.net->sk;
b064ba9c	288	const struct unix_sock *u;
ae3b5641	289	struct unix_address *addr;
6e837fb1 EB	290	int len = 0;
	291	char *p = NULL;
	292
	293	switch (sk->sk_family) {
	294	case AF_INET: {
abc17a11	295	const struct inet_sock *inet = inet_sk(sk);
6e837fb1	296
c720c7e8 ED	297	print_ipv4_addr(ab, inet->inet_rcv_saddr,
c720c7e8 ED	298	inet->inet_sport,
6e837fb1	299	"laddr", "lport");
c720c7e8 ED	300	print_ipv4_addr(ab, inet->inet_daddr,
c720c7e8 ED	301	inet->inet_dport,
6e837fb1 EB	302	"faddr", "fport");
	303	break;
	304	}
c2bb06db	305	#if IS_ENABLED(CONFIG_IPV6)
6e837fb1	306	case AF_INET6: {
abc17a11	307	const struct inet_sock *inet = inet_sk(sk);
6e837fb1	308
efe4208f	309	print_ipv6_addr(ab, &sk->sk_v6_rcv_saddr,
c720c7e8	310	inet->inet_sport,
6e837fb1	311	"laddr", "lport");
efe4208f	312	print_ipv6_addr(ab, &sk->sk_v6_daddr,
c720c7e8	313	inet->inet_dport,
6e837fb1 EB	314	"faddr", "fport");
	315	break;
	316	}
c2bb06db	317	#endif
6e837fb1 EB	318	case AF_UNIX:
6e837fb1 EB	319	u = unix_sk(sk);
ae3b5641 AV	320	addr = smp_load_acquire(&u->addr);
	321	if (!addr)
	322	break;
40ffe67d AV	323	if (u->path.dentry) {
40ffe67d AV	324	audit_log_d_path(ab, " path=", &u->path);
6e837fb1 EB	325	break;
6e837fb1 EB	326	}
ae3b5641 AV	327	len = addr->len-sizeof(short);
ae3b5641 AV	328	p = &addr->name->sun_path[0];
6e837fb1 EB	329	audit_log_format(ab, " path=");
	330	if (*p)
	331	audit_log_untrustedstring(ab, p);
	332	else
	333	audit_log_n_hex(ab, p, len);
	334	break;
	335	}
	336	}
	337
48c62af6	338	switch (a->u.net->family) {
6e837fb1	339	case AF_INET:
48c62af6 EP	340	print_ipv4_addr(ab, a->u.net->v4info.saddr,
48c62af6 EP	341	a->u.net->sport,
6e837fb1	342	"saddr", "src");
48c62af6 EP	343	print_ipv4_addr(ab, a->u.net->v4info.daddr,
48c62af6 EP	344	a->u.net->dport,
6e837fb1 EB	345	"daddr", "dest");
	346	break;
	347	case AF_INET6:
48c62af6 EP	348	print_ipv6_addr(ab, &a->u.net->v6info.saddr,
48c62af6 EP	349	a->u.net->sport,
6e837fb1	350	"saddr", "src");
48c62af6 EP	351	print_ipv6_addr(ab, &a->u.net->v6info.daddr,
48c62af6 EP	352	a->u.net->dport,
6e837fb1 EB	353	"daddr", "dest");
	354	break;
	355	}
48c62af6	356	if (a->u.net->netif > 0) {
6e837fb1 EB	357	struct net_device *dev;
	358
	359	/* NOTE: we always use init's namespace */
48c62af6	360	dev = dev_get_by_index(&init_net, a->u.net->netif);
6e837fb1 EB	361	if (dev) {
	362	audit_log_format(ab, " netif=%s", dev->name);
	363	dev_put(dev);
	364	}
	365	}
	366	break;
	367	#ifdef CONFIG_KEYS
	368	case LSM_AUDIT_DATA_KEY:
	369	audit_log_format(ab, " key_serial=%u", a->u.key_struct.key);
	370	if (a->u.key_struct.key_desc) {
	371	audit_log_format(ab, " key_desc=");
	372	audit_log_untrustedstring(ab, a->u.key_struct.key_desc);
	373	}
	374	break;
	375	#endif
dd8dbf2e EP	376	case LSM_AUDIT_DATA_KMOD:
	377	audit_log_format(ab, " kmod=");
	378	audit_log_untrustedstring(ab, a->u.kmod_name);
	379	break;
cfc4d882 DJ	380	case LSM_AUDIT_DATA_IBPKEY: {
	381	struct in6_addr sbn_pfx;
	382
	383	memset(&sbn_pfx.s6_addr, 0,
	384	sizeof(sbn_pfx.s6_addr));
	385	memcpy(&sbn_pfx.s6_addr, &a->u.ibpkey->subnet_prefix,
	386	sizeof(a->u.ibpkey->subnet_prefix));
	387	audit_log_format(ab, " pkey=0x%x subnet_prefix=%pI6c",
	388	a->u.ibpkey->pkey, &sbn_pfx);
	389	break;
	390	}
ab861dfc DJ	391	case LSM_AUDIT_DATA_IBENDPORT:
	392	audit_log_format(ab, " device=%s port_num=%u",
	393	a->u.ibendport->dev_name,
	394	a->u.ibendport->port);
	395	break;
59438b46	396	case LSM_AUDIT_DATA_LOCKDOWN:
f1d9b23c RGB	397	audit_log_format(ab, " lockdown_reason=\"%s\"",
f1d9b23c RGB	398	lockdown_reasons[a->u.reason]);
59438b46	399	break;
c29722fa CG	400	case LSM_AUDIT_DATA_ANONINODE:
	401	audit_log_format(ab, " anonclass=%s", a->u.anonclass);
	402	break;
2ef6fc99 TW	403	case LSM_AUDIT_DATA_NLMSGTYPE:
	404	audit_log_format(ab, " nl-msgtype=%hu", a->u.nlmsg_type);
	405	break;
6e837fb1 EB	406	} /* switch (a->type) */
	407	}
	408
9b08a166 MS	409	/**
	410	* dump_common_audit_data - helper to dump common audit data
	411	* @ab : the audit buffer
	412	* @a : common audit data
	413	*/
	414	static void dump_common_audit_data(struct audit_buffer *ab,
	415	const struct common_audit_data *a)
	416	{
	417	char comm[sizeof(current->comm)];
	418
	419	audit_log_format(ab, " pid=%d comm=", task_tgid_nr(current));
	420	audit_log_untrustedstring(ab, get_task_comm(comm, current));
	421	audit_log_lsm_data(ab, a);
	422	}
	423
6e837fb1 EB	424	/**
	425	* common_lsm_audit - generic LSM auditing function
	426	* @a: auxiliary audit data
b61c37f5 LT	427	* @pre_audit: lsm-specific pre-audit callback
b61c37f5 LT	428	* @post_audit: lsm-specific post-audit callback
6e837fb1 EB	429	*
	430	* setup the audit buffer for common security information
	431	* uses callback to print LSM specific information
	432	*/
b61c37f5 LT	433	void common_lsm_audit(struct common_audit_data *a,
	434	void (pre_audit)(struct audit_buffer , void *),
	435	void (post_audit)(struct audit_buffer , void *))
6e837fb1 EB	436	{
	437	struct audit_buffer *ab;
	438
	439	if (a == NULL)
	440	return;
	441	/* we use GFP_ATOMIC so we won't sleep */
cdfb6b34	442	ab = audit_log_start(audit_context(), GFP_ATOMIC \| __GFP_NOWARN,
a20b62bd	443	AUDIT_AVC);
6e837fb1 EB	444
	445	if (ab == NULL)
	446	return;
	447
b61c37f5 LT	448	if (pre_audit)
b61c37f5 LT	449	pre_audit(ab, a);
6e837fb1 EB	450
	451	dump_common_audit_data(ab, a);
	452
b61c37f5 LT	453	if (post_audit)
b61c37f5 LT	454	post_audit(ab, a);
6e837fb1 EB	455
	456	audit_log_end(ab);
	457	}