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>

1 files changed, 119 insertions, 1 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;