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 4f04222698d9..47c13649bac1 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 a14c88bf17f0..d5d3a6f1f609 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 311205ffa775..e5372b11fc8f 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);