[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: Joy Latten <latten@austin.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 167 insertions, 158 deletions

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 6ab81b1d215e..36dd31c40f4a 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -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)
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index d4356e6f7f9b..15734adc9367 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -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 */
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 9e516f5cbb5e..0d81c0f23919 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -30,7 +30,6 @@
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 #include <linux/in6.h>
 #endif
-#include <linux/audit.h>
 
 static inline int alg_len(struct xfrm_algo *alg)
 {
@@ -371,8 +370,8 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         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);
+        xfrm_audit_state_add(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
+                             NETLINK_CB(skb).sid);
 
         if (err < 0) {
                 x->km.state = XFRM_STATE_DEAD;
@@ -451,8 +450,8 @@ static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
         km_state_notify(x, &c);
 
 out:
-        xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
-                       AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
+        xfrm_audit_state_delete(x, err ? 0 : 1, NETLINK_CB(skb).loginuid,
+                                NETLINK_CB(skb).sid);
         xfrm_state_put(x);
         return err;
 }
@@ -1067,8 +1066,8 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
          * 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);
+        xfrm_audit_policy_add(xp, err ? 0 : 1, NETLINK_CB(skb).loginuid,
+                              NETLINK_CB(skb).sid);
 
         if (err) {
                 security_xfrm_policy_free(xp);
@@ -1290,8 +1289,9 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
                                             NETLINK_CB(skb).pid);
                 }
         } else {
-                xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
-                               AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
+                xfrm_audit_policy_delete(xp, err ? 0 : 1,
+                                         NETLINK_CB(skb).loginuid,
+                                         NETLINK_CB(skb).sid);
 
                 if (err != 0)
                         goto out;
@@ -1523,8 +1523,8 @@ static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
         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);
+                xfrm_audit_policy_delete(xp, 1, NETLINK_CB(skb).loginuid,
+                                         NETLINK_CB(skb).sid);
 
         } else {
                 // reset the timers here?
@@ -1559,8 +1559,8 @@ static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
 
         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);
+                xfrm_audit_state_delete(x, 1, NETLINK_CB(skb).loginuid,
+                                        NETLINK_CB(skb).sid);
         }
         err = 0;
 out: