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>
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 @@
}
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
}
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 @@
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 @@
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 @@
}
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 @@
* 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 @@
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 @@
{
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 @@
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 @@
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 @@
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);