audit: Add auditing to ipsec

An audit message occurs when an ipsec SA
or ipsec policy is created/deleted.

Signed-off-by: Joy Latten <latten@austin.ibm.com>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 164 insertions, 6 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 4f04222..47c1364 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -25,6 +25,7 @@
 #include <linux/cache.h>
 #include <net/xfrm.h>
 #include <net/ip.h>
+#include <linux/audit.h>
 
 #include "xfrm_hash.h"
 
@@ -804,7 +805,7 @@ struct xfrm_policy *xfrm_policy_byid(u8 type, int dir, u32 id, int delete)
 }
 EXPORT_SYMBOL(xfrm_policy_byid);
 
-void xfrm_policy_flush(u8 type)
+void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info)
 {
 	int dir;
 
@@ -824,6 +825,9 @@ void xfrm_policy_flush(u8 type)
 			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_policy_kill(pol);
 			killed++;
 
@@ -842,6 +846,11 @@ void xfrm_policy_flush(u8 type)
 				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_policy_kill(pol);
 				killed++;
 
@@ -1977,6 +1986,115 @@ int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *first,
 
 EXPORT_SYMBOL(xfrm_bundle_ok);
 
+/* 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;
+
+	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);
+	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);
+
 int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo)
 {
 	int err = 0;
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index a14c88b..d5d3a6f 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -20,6 +20,7 @@
 #include <linux/module.h>
 #include <linux/cache.h>
 #include <asm/uaccess.h>
+#include <linux/audit.h>
 
 #include "xfrm_hash.h"
 
@@ -238,6 +239,7 @@ static void xfrm_timer_handler(unsigned long data)
 	unsigned long now = (unsigned long)xtime.tv_sec;
 	long next = LONG_MAX;
 	int warn = 0;
+	int err = 0;
 
 	spin_lock(&x->lock);
 	if (x->km.state == XFRM_STATE_DEAD)
@@ -295,9 +297,14 @@ expired:
 		next = 2;
 		goto resched;
 	}
-	if (!__xfrm_state_delete(x) && x->id.spi)
+
+	err = __xfrm_state_delete(x);
+	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);
+
 out:
 	spin_unlock(&x->lock);
 }
@@ -384,9 +391,10 @@ int xfrm_state_delete(struct xfrm_state *x)
 }
 EXPORT_SYMBOL(xfrm_state_delete);
 
-void xfrm_state_flush(u8 proto)
+void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info)
 {
 	int i;
+	int err = 0;
 
 	spin_lock_bh(&xfrm_state_lock);
 	for (i = 0; i <= xfrm_state_hmask; i++) {
@@ -400,6 +408,11 @@ restart:
 				spin_unlock_bh(&xfrm_state_lock);
 
 				xfrm_state_delete(x);
+				err = xfrm_state_delete(x);
+				xfrm_audit_log(audit_info->loginuid,
+					       audit_info->secid,
+					       AUDIT_MAC_IPSEC_DELSA,
+					       err ? 0 : 1, NULL, x);
 				xfrm_state_put(x);
 
 				spin_lock_bh(&xfrm_state_lock);
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 311205f..e5372b1 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -31,6 +31,7 @@
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 #include <linux/in6.h>
 #endif
+#include <linux/audit.h>
 
 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
 {
@@ -454,6 +455,9 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
 	else
 		err = xfrm_state_update(x);
 
+	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
+		       AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
+
 	if (err < 0) {
 		x->km.state = XFRM_STATE_DEAD;
 		__xfrm_state_put(x);
@@ -523,6 +527,10 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
 	}
 
 	err = xfrm_state_delete(x);
+
+	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
+		       AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
+
 	if (err < 0)
 		goto out;
 
@@ -1030,6 +1038,9 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
 	 * a type XFRM_MSG_UPDPOLICY - JHS */
 	excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
 	err = xfrm_policy_insert(p->dir, xp, excl);
+	xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
+		       AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
+
 	if (err) {
 		security_xfrm_policy_free(xp);
 		kfree(xp);
@@ -1257,6 +1268,10 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
 		xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security, delete);
 		security_xfrm_policy_free(&tmp);
 	}
+	if (delete)
+		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
+			       AUDIT_MAC_IPSEC_DELSPD, (xp) ? 1 : 0, xp, NULL);
+
 	if (xp == NULL)
 		return -ENOENT;
 
@@ -1291,8 +1306,11 @@ static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma
 {
 	struct km_event c;
 	struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
+	struct xfrm_audit audit_info;
 
-	xfrm_state_flush(p->proto);
+	audit_info.loginuid = NETLINK_CB(skb).loginuid;
+	audit_info.secid = NETLINK_CB(skb).sid;
+	xfrm_state_flush(p->proto, &audit_info);
 	c.data.proto = p->proto;
 	c.event = nlh->nlmsg_type;
 	c.seq = nlh->nlmsg_seq;
@@ -1442,12 +1460,15 @@ static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **x
 	struct km_event c;
 	u8 type = XFRM_POLICY_TYPE_MAIN;
 	int err;
+	struct xfrm_audit audit_info;
 
 	err = copy_from_user_policy_type(&type, (struct rtattr **)xfrma);
 	if (err)
 		return err;
 
-	xfrm_policy_flush(type);
+	audit_info.loginuid = NETLINK_CB(skb).loginuid;
+	audit_info.secid = NETLINK_CB(skb).sid;
+	xfrm_policy_flush(type, &audit_info);
 	c.data.type = type;
 	c.event = nlh->nlmsg_type;
 	c.seq = nlh->nlmsg_seq;
@@ -1502,6 +1523,9 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void *
 	err = 0;
 	if (up->hard) {
 		xfrm_policy_delete(xp, p->dir);
+		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
+				AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
+
 	} else {
 		// reset the timers here?
 		printk("Dont know what to do with soft policy expire\n");
@@ -1533,8 +1557,11 @@ static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh, void **
 		goto out;
 	km_state_expired(x, ue->hard, current->pid);
 
-	if (ue->hard)
+	if (ue->hard) {
 		__xfrm_state_delete(x);
+		xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
+			       AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
+	}
 out:
 	spin_unlock_bh(&x->lock);
 	xfrm_state_put(x);