Commit ab5f5e8b authored by Joy Latten's avatar Joy Latten Committed by David S. Miller
Browse files

[XFRM]: xfrm audit calls 



This patch modifies the current ipsec audit layer
by breaking it up into purpose driven audit calls.

So far, the only audit calls made are when add/delete
an SA/policy. It had been discussed to give each
key manager it's own calls to do this, but I found
there to be much redundnacy since they did the exact
same things, except for how they got auid and sid, so I
combined them. The below audit calls can be made by any
key manager. Hopefully, this is ok.

Signed-off-by: default avatarJoy Latten <latten@austin.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d2e9117c

include/linux/audit.h

+5 −4
Original line number Diff line number Diff line
@@ -108,10 +108,11 @@ 
#define AUDIT_MAC_CIPSOV4_DEL	1408	/* NetLabel: del CIPSOv4 DOI entry */

#define AUDIT_MAC_MAP_ADD	1409	/* NetLabel: add LSM domain mapping */

#define AUDIT_MAC_MAP_DEL	1410	/* NetLabel: del LSM domain mapping */

#define AUDIT_MAC_IPSEC_ADDSA	1411	/* Add a XFRM state */

#define AUDIT_MAC_IPSEC_DELSA	1412	/* Delete a XFRM state */

#define AUDIT_MAC_IPSEC_ADDSPD	1413	/* Add a XFRM policy */

#define AUDIT_MAC_IPSEC_DELSPD	1414	/* Delete a XFRM policy */

#define AUDIT_MAC_IPSEC_ADDSA	1411	/* Not used */

#define AUDIT_MAC_IPSEC_DELSA	1412	/* Not used  */

#define AUDIT_MAC_IPSEC_ADDSPD	1413	/* Not used */

#define AUDIT_MAC_IPSEC_DELSPD	1414	/* Not used */

#define AUDIT_MAC_IPSEC_EVENT	1415	/* Audit an IPSec event */



#define AUDIT_FIRST_KERN_ANOM_MSG   1700

#define AUDIT_LAST_KERN_ANOM_MSG    1799

include/net/xfrm.h

+36 −4
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/ipsec.h>

#include <linux/in6.h>

#include <linux/mutex.h>

#include <linux/audit.h>



#include <net/sock.h>

#include <net/dst.h>
@@ -421,15 +422,46 @@ extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2]; 
/* Audit Information */

struct xfrm_audit

{

	uid_t	loginuid;

	u32	loginuid;

	u32	secid;

};



#ifdef CONFIG_AUDITSYSCALL

extern void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,

		    struct xfrm_policy *xp, struct xfrm_state *x);

static inline struct audit_buffer *xfrm_audit_start(u32 auid, u32 sid)

{

	struct audit_buffer *audit_buf = NULL;

	char *secctx;

	u32 secctx_len;



	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,

			      AUDIT_MAC_IPSEC_EVENT);

	if (audit_buf == NULL)

		return NULL;



	audit_log_format(audit_buf, "auid=%u", auid);



	if (sid != 0 &&

	    security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {

		audit_log_format(audit_buf, " subj=%s", secctx);

		security_release_secctx(secctx, secctx_len);

	} else

		audit_log_task_context(audit_buf);

	return audit_buf;

}



extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,

				  u32 auid, u32 sid);

extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,

				  u32 auid, u32 sid);

extern void xfrm_audit_state_add(struct xfrm_state *x, int result,

				 u32 auid, u32 sid);

extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,

				    u32 auid, u32 sid);

#else

#define xfrm_audit_log(a,s,t,r,p,x) do { ; } while (0)

#define xfrm_audit_policy_add(x, r, a, s)	do { ; } while (0)

#define xfrm_audit_policy_delete(x, r, a, s)	do { ; } while (0)

#define xfrm_audit_state_add(x, r, a, s)	do { ; } while (0)

#define xfrm_audit_state_delete(x, r, a, s)	do { ; } while (0)

#endif /* CONFIG_AUDITSYSCALL */



static inline void xfrm_pol_hold(struct xfrm_policy *policy)

net/key/af_key.c

+10 −11
Original line number Diff line number Diff line
@@ -27,7 +27,6 @@ 
#include <linux/proc_fs.h>

#include <linux/init.h>

#include <net/xfrm.h>

#include <linux/audit.h>



#include <net/sock.h>
@@ -1454,8 +1453,8 @@ static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, 
	else

		err = xfrm_state_update(x);



	xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,

		       AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);

	xfrm_audit_state_add(x, err ? 0 : 1,

			     audit_get_loginuid(current->audit_context), 0);



	if (err < 0) {

		x->km.state = XFRM_STATE_DEAD;
@@ -1508,8 +1507,8 @@ static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h 
	c.event = XFRM_MSG_DELSA;

	km_state_notify(x, &c);

out:

	xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,

		       AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);

	xfrm_audit_state_delete(x, err ? 0 : 1,

			       audit_get_loginuid(current->audit_context), 0);

	xfrm_state_put(x);



	return err;
@@ -2261,8 +2260,8 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h 
	err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,

				 hdr->sadb_msg_type != SADB_X_SPDUPDATE);



	xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,

		       AUDIT_MAC_IPSEC_ADDSPD, err ? 0 : 1, xp, NULL);

	xfrm_audit_policy_add(xp, err ? 0 : 1,

			     audit_get_loginuid(current->audit_context), 0);



	if (err)

		goto out;
@@ -2345,8 +2344,8 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg 
	if (xp == NULL)

		return -ENOENT;



	xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,

		       AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);

	xfrm_audit_policy_delete(xp, err ? 0 : 1,

				audit_get_loginuid(current->audit_context), 0);



	if (err)

		goto out;
@@ -2606,8 +2605,8 @@ static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h 
		return -ENOENT;



	if (delete) {

		xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,

			       AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);

		xfrm_audit_policy_delete(xp, err ? 0 : 1,

				audit_get_loginuid(current->audit_context), 0);



		if (err)

			goto out;

net/xfrm/xfrm_policy.c

+77 −133
Original line number Diff line number Diff line
@@ -23,7 +23,6 @@ 
#include <linux/netfilter.h>

#include <linux/module.h>

#include <linux/cache.h>

#include <linux/audit.h>

#include <net/xfrm.h>

#include <net/ip.h>
@@ -850,10 +849,9 @@ xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) 
				continue;

			err = security_xfrm_policy_delete(pol);

			if (err) {

				xfrm_audit_log(audit_info->loginuid,

					       audit_info->secid,

					       AUDIT_MAC_IPSEC_DELSPD, 0,

					       pol, NULL);

				xfrm_audit_policy_delete(pol, 0,

							 audit_info->loginuid,

							 audit_info->secid);

				return err;

			}

		}
@@ -865,10 +863,9 @@ xfrm_policy_flush_secctx_check(u8 type, struct xfrm_audit *audit_info) 
					continue;

				err = security_xfrm_policy_delete(pol);

				if (err) {

					xfrm_audit_log(audit_info->loginuid,

						       audit_info->secid,

						       AUDIT_MAC_IPSEC_DELSPD,

						       0, pol, NULL);

					xfrm_audit_policy_delete(pol, 0,

							audit_info->loginuid,

							audit_info->secid);

					return err;

				}

			}
@@ -909,8 +906,8 @@ int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) 
			hlist_del(&pol->byidx);

			write_unlock_bh(&xfrm_policy_lock);



			xfrm_audit_log(audit_info->loginuid, audit_info->secid,

				       AUDIT_MAC_IPSEC_DELSPD, 1, pol, NULL);

			xfrm_audit_policy_delete(pol, 1, audit_info->loginuid,

						 audit_info->secid);



			xfrm_policy_kill(pol);

			killed++;
@@ -930,11 +927,9 @@ int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info) 
				hlist_del(&pol->byidx);

				write_unlock_bh(&xfrm_policy_lock);



				xfrm_audit_log(audit_info->loginuid,

					       audit_info->secid,

					       AUDIT_MAC_IPSEC_DELSPD, 1,

					       pol, NULL);



				xfrm_audit_policy_delete(pol, 1,

							 audit_info->loginuid,

							 audit_info->secid);

				xfrm_policy_kill(pol);

				killed++;
@@ -2150,123 +2145,6 @@ int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first, 


EXPORT_SYMBOL(xfrm_bundle_ok);



#ifdef CONFIG_AUDITSYSCALL

/* Audit addition and deletion of SAs and ipsec policy */



void xfrm_audit_log(uid_t auid, u32 sid, int type, int result,

		    struct xfrm_policy *xp, struct xfrm_state *x)

{



	char *secctx;

	u32 secctx_len;

	struct xfrm_sec_ctx *sctx = NULL;

	struct audit_buffer *audit_buf;

	int family;

	extern int audit_enabled;



	if (audit_enabled == 0)

		return;



	BUG_ON((type == AUDIT_MAC_IPSEC_ADDSA ||

		type == AUDIT_MAC_IPSEC_DELSA) && !x);

	BUG_ON((type == AUDIT_MAC_IPSEC_ADDSPD ||

		type == AUDIT_MAC_IPSEC_DELSPD) && !xp);



	audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type);

	if (audit_buf == NULL)

		return;



	switch(type) {

	case AUDIT_MAC_IPSEC_ADDSA:

		audit_log_format(audit_buf, "SAD add: auid=%u", auid);

		break;

	case AUDIT_MAC_IPSEC_DELSA:

		audit_log_format(audit_buf, "SAD delete: auid=%u", auid);

		break;

	case AUDIT_MAC_IPSEC_ADDSPD:

		audit_log_format(audit_buf, "SPD add: auid=%u", auid);

		break;

	case AUDIT_MAC_IPSEC_DELSPD:

		audit_log_format(audit_buf, "SPD delete: auid=%u", auid);

		break;

	default:

		return;

	}



	if (sid != 0 &&

	    security_secid_to_secctx(sid, &secctx, &secctx_len) == 0) {

		audit_log_format(audit_buf, " subj=%s", secctx);

		security_release_secctx(secctx, secctx_len);

	} else

		audit_log_task_context(audit_buf);



	if (xp) {

		family = xp->selector.family;

		if (xp->security)

			sctx = xp->security;

	} else {

		family = x->props.family;

		if (x->security)

			sctx = x->security;

	}



	if (sctx)

		audit_log_format(audit_buf,

				" sec_alg=%u sec_doi=%u sec_obj=%s",

				sctx->ctx_alg, sctx->ctx_doi, sctx->ctx_str);



	switch(family) {

	case AF_INET:

		{

			struct in_addr saddr, daddr;

			if (xp) {

				saddr.s_addr = xp->selector.saddr.a4;

				daddr.s_addr = xp->selector.daddr.a4;

			} else {

				saddr.s_addr = x->props.saddr.a4;

				daddr.s_addr = x->id.daddr.a4;

			}

			audit_log_format(audit_buf,

					 " src=%u.%u.%u.%u dst=%u.%u.%u.%u",

					 NIPQUAD(saddr), NIPQUAD(daddr));

		}

			break;

	case AF_INET6:

		{

			struct in6_addr saddr6, daddr6;

			if (xp) {

				memcpy(&saddr6, xp->selector.saddr.a6,

					sizeof(struct in6_addr));

				memcpy(&daddr6, xp->selector.daddr.a6,

					sizeof(struct in6_addr));

			} else {

				memcpy(&saddr6, x->props.saddr.a6,

					sizeof(struct in6_addr));

				memcpy(&daddr6, x->id.daddr.a6,

					sizeof(struct in6_addr));

			}

			audit_log_format(audit_buf,

					 " src=" NIP6_FMT " dst=" NIP6_FMT,

					 NIP6(saddr6), NIP6(daddr6));

		}

		break;

	}



	if (x)

		audit_log_format(audit_buf, " spi=%lu(0x%lx) protocol=%s",

				(unsigned long)ntohl(x->id.spi),

				(unsigned long)ntohl(x->id.spi),

				x->id.proto == IPPROTO_AH ? "AH" :

				(x->id.proto == IPPROTO_ESP ?

				"ESP" : "IPCOMP"));



	audit_log_format(audit_buf, " res=%u", result);

	audit_log_end(audit_buf);

}



EXPORT_SYMBOL(xfrm_audit_log);

#endif /* CONFIG_AUDITSYSCALL */



int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)

{

	int err = 0;
@@ -2412,6 +2290,72 @@ void __init xfrm_init(void) 
	xfrm_input_init();

}



#ifdef CONFIG_AUDITSYSCALL

static inline void xfrm_audit_common_policyinfo(struct xfrm_policy *xp,

						struct audit_buffer *audit_buf)

{

	if (xp->security)

		audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",

				 xp->security->ctx_alg, xp->security->ctx_doi,

				 xp->security->ctx_str);



	switch(xp->selector.family) {

	case AF_INET:

		audit_log_format(audit_buf, " src=%u.%u.%u.%u dst=%u.%u.%u.%u",

				 NIPQUAD(xp->selector.saddr.a4),

				 NIPQUAD(xp->selector.daddr.a4));

		break;

	case AF_INET6:

		{

			struct in6_addr saddr6, daddr6;



			memcpy(&saddr6, xp->selector.saddr.a6,

				sizeof(struct in6_addr));

			memcpy(&daddr6, xp->selector.daddr.a6,

				sizeof(struct in6_addr));

			audit_log_format(audit_buf,

				" src=" NIP6_FMT " dst=" NIP6_FMT,

				NIP6(saddr6), NIP6(daddr6));

		}

		break;

	}

}



void

xfrm_audit_policy_add(struct xfrm_policy *xp, int result, u32 auid, u32 sid)

{

	struct audit_buffer *audit_buf;

	extern int audit_enabled;



	if (audit_enabled == 0)

		return;

	audit_buf = xfrm_audit_start(sid, auid);

	if (audit_buf == NULL)

		return;

	audit_log_format(audit_buf, " op=SPD-add res=%u", result);

	xfrm_audit_common_policyinfo(xp, audit_buf);

	audit_log_end(audit_buf);

}

EXPORT_SYMBOL_GPL(xfrm_audit_policy_add);



void

xfrm_audit_policy_delete(struct xfrm_policy *xp, int result, u32 auid, u32 sid)

{

	struct audit_buffer *audit_buf;

	extern int audit_enabled;



	if (audit_enabled == 0)

		return;

	audit_buf = xfrm_audit_start(sid, auid);

	if (audit_buf == NULL)

		return;

	audit_log_format(audit_buf, " op=SPD-delete res=%u", result);

	xfrm_audit_common_policyinfo(xp, audit_buf);

	audit_log_end(audit_buf);

}

EXPORT_SYMBOL_GPL(xfrm_audit_policy_delete);

#endif



#ifdef CONFIG_XFRM_MIGRATE

static int xfrm_migrate_selector_match(struct xfrm_selector *sel_cmp,

				       struct xfrm_selector *sel_tgt)

net/xfrm/xfrm_state.c

+77 −12
Original line number Diff line number Diff line
@@ -19,7 +19,6 @@ 
#include <linux/ipsec.h>

#include <linux/module.h>

#include <linux/cache.h>

#include <linux/audit.h>

#include <asm/uaccess.h>



#include "xfrm_hash.h"
@@ -301,8 +300,8 @@ expired: 
	if (!err && x->id.spi)

		km_state_expired(x, 1, 0);



	xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,

		       AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);

	xfrm_audit_state_delete(x, err ? 0 : 1,

				audit_get_loginuid(current->audit_context), 0);



out:

	spin_unlock(&x->lock);
@@ -403,11 +402,9 @@ xfrm_state_flush_secctx_check(u8 proto, struct xfrm_audit *audit_info) 
		hlist_for_each_entry(x, entry, xfrm_state_bydst+i, bydst) {

			if (xfrm_id_proto_match(x->id.proto, proto) &&

			   (err = security_xfrm_state_delete(x)) != 0) {

				xfrm_audit_log(audit_info->loginuid,

					       audit_info->secid,

					       AUDIT_MAC_IPSEC_DELSA,

					       0, NULL, x);



				xfrm_audit_state_delete(x, 0,

							audit_info->loginuid,

							audit_info->secid);

				return err;

			}

		}
@@ -443,10 +440,9 @@ restart: 
				spin_unlock_bh(&xfrm_state_lock);



				err = xfrm_state_delete(x);

				xfrm_audit_log(audit_info->loginuid,

					       audit_info->secid,

					       AUDIT_MAC_IPSEC_DELSA,

					       err ? 0 : 1, NULL, x);

				xfrm_audit_state_delete(x, err ? 0 : 1,

							audit_info->loginuid,

							audit_info->secid);

				xfrm_state_put(x);



				spin_lock_bh(&xfrm_state_lock);
@@ -1821,3 +1817,72 @@ void __init xfrm_state_init(void) 
	INIT_WORK(&xfrm_state_gc_work, xfrm_state_gc_task);

}



#ifdef CONFIG_AUDITSYSCALL

static inline void xfrm_audit_common_stateinfo(struct xfrm_state *x,

					       struct audit_buffer *audit_buf)

{

	if (x->security)

		audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",

				 x->security->ctx_alg, x->security->ctx_doi,

				 x->security->ctx_str);



	switch(x->props.family) {

	case AF_INET:

		audit_log_format(audit_buf, " src=%u.%u.%u.%u dst=%u.%u.%u.%u",

				 NIPQUAD(x->props.saddr.a4),

				 NIPQUAD(x->id.daddr.a4));

		break;

	case AF_INET6:

		{

			struct in6_addr saddr6, daddr6;



			memcpy(&saddr6, x->props.saddr.a6,

				sizeof(struct in6_addr));

			memcpy(&daddr6, x->id.daddr.a6,

				sizeof(struct in6_addr));

			audit_log_format(audit_buf,

					 " src=" NIP6_FMT " dst=" NIP6_FMT,

					 NIP6(saddr6), NIP6(daddr6));

		}

		break;

	}

}



void

xfrm_audit_state_add(struct xfrm_state *x, int result, u32 auid, u32 sid)

{

	struct audit_buffer *audit_buf;

	extern int audit_enabled;



	if (audit_enabled == 0)

		return;

	audit_buf = xfrm_audit_start(sid, auid);

	if (audit_buf == NULL)

		return;

	audit_log_format(audit_buf, " op=SAD-add res=%u",result);

	xfrm_audit_common_stateinfo(x, audit_buf);

	audit_log_format(audit_buf, " spi=%lu(0x%lx)",

			 (unsigned long)x->id.spi, (unsigned long)x->id.spi);

	audit_log_end(audit_buf);

}

EXPORT_SYMBOL_GPL(xfrm_audit_state_add);



void

xfrm_audit_state_delete(struct xfrm_state *x, int result, u32 auid, u32 sid)

{

	struct audit_buffer *audit_buf;

	extern int audit_enabled;



	if (audit_enabled == 0)

		return;

	audit_buf = xfrm_audit_start(sid, auid);

	if (audit_buf == NULL)

		return;

	audit_log_format(audit_buf, " op=SAD-delete res=%u",result);

	xfrm_audit_common_stateinfo(x, audit_buf);

	audit_log_format(audit_buf, " spi=%lu(0x%lx)",

			 (unsigned long)x->id.spi, (unsigned long)x->id.spi);

	audit_log_end(audit_buf);

}

EXPORT_SYMBOL_GPL(xfrm_audit_state_delete);

#endif /* CONFIG_AUDITSYSCALL */

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