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audit: Add auditing to ipsec

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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>
This commit is contained in:
Joy Latten 2006-11-27 13:11:54 -06:00 committed by David S. Miller
parent 95b99a670d
commit 161a09e737
7 changed files with 213 additions and 15 deletions
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6
include/linux/audit.h
View file

@ -101,6 +101,10 @@
#define AUDIT_MAC_CIPSOV4_DEL 1408 /* NetLabel: del CIPSOv4 DOI entry */
#define AUDIT_MAC_MAP_ADD 1409 /* NetLabel: add LSM domain mapping */
#define AUDIT_MAC_MAP_DEL 1410 /* NetLabel: del LSM domain mapping */
#define AUDIT_MAC_IPSEC_ADDSA 1411 /* Add a XFRM state */
#define AUDIT_MAC_IPSEC_DELSA 1412 /* Delete a XFRM state */
#define AUDIT_MAC_IPSEC_ADDSPD 1413 /* Add a XFRM policy */
#define AUDIT_MAC_IPSEC_DELSPD 1414 /* Delete a XFRM policy */
#define AUDIT_FIRST_KERN_ANOM_MSG 1700
#define AUDIT_LAST_KERN_ANOM_MSG 1799
@ -377,6 +381,7 @@ extern void auditsc_get_stamp(struct audit_context *ctx,
struct timespec *t, unsigned int *serial);
extern int audit_set_loginuid(struct task_struct *task, uid_t loginuid);
extern uid_t audit_get_loginuid(struct audit_context *ctx);
extern void audit_log_task_context(struct audit_buffer *ab);
extern int __audit_ipc_obj(struct kern_ipc_perm *ipcp);
extern int __audit_ipc_set_perm(unsigned long qbytes, uid_t uid, gid_t gid, mode_t mode);
extern int audit_bprm(struct linux_binprm *bprm);
@ -449,6 +454,7 @@ extern int audit_n_rules;
#define audit_inode_update(i) do { ; } while (0)
#define auditsc_get_stamp(c,t,s) do { BUG(); } while (0)
#define audit_get_loginuid(c) ({ -1; })
#define audit_log_task_context(b) do { ; } while (0)
#define audit_ipc_obj(i) ({ 0; })
#define audit_ipc_set_perm(q,u,g,m) ({ 0; })
#define audit_bprm(p) ({ 0; })

19
include/net/xfrm.h
View file

@ -392,6 +392,15 @@ extern int xfrm_unregister_km(struct xfrm_mgr *km);
extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
/* Audit Information */
struct xfrm_audit
{
uid_t loginuid;
u32 secid;
};
void xfrm_audit_log(uid_t auid, u32 secid, int type, int result,
struct xfrm_policy *xp, struct xfrm_state *x);
static inline void xfrm_pol_hold(struct xfrm_policy *policy)
{
if (likely(policy != NULL))
@ -906,7 +915,7 @@ static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **s
#endif
extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
extern int xfrm_state_delete(struct xfrm_state *x);
extern void xfrm_state_flush(u8 proto);
extern void xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
extern int xfrm_replay_check(struct xfrm_state *x, __be32 seq);
extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
extern void xfrm_replay_notify(struct xfrm_state *x, int event);
@ -959,13 +968,13 @@ struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
struct xfrm_selector *sel,
struct xfrm_sec_ctx *ctx, int delete);
struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete);
void xfrm_policy_flush(u8 type);
void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
u32 xfrm_get_acqseq(void);
void xfrm_alloc_spi(struct xfrm_state *x, __be32 minspi, __be32 maxspi);
struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
xfrm_address_t *daddr, xfrm_address_t *saddr,
struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
xfrm_address_t *daddr, xfrm_address_t *saddr,
int create, unsigned short family);
extern void xfrm_policy_flush(u8 type);
extern void xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
struct flowi *fl, int family, int strict);

6
kernel/auditsc.c
View file

@ -731,7 +731,7 @@ static inline void audit_free_context(struct audit_context *context)
printk(KERN_ERR "audit: freed %d contexts\n", count);
}
static void audit_log_task_context(struct audit_buffer *ab)
void audit_log_task_context(struct audit_buffer *ab)
{
char *ctx = NULL;
ssize_t len = 0;
@ -760,6 +760,8 @@ error_path:
return;
}
EXPORT_SYMBOL(audit_log_task_context);
static void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
{
char name[sizeof(tsk->comm)];
@ -1488,6 +1490,8 @@ uid_t audit_get_loginuid(struct audit_context *ctx)
return ctx ? ctx->loginuid : -1;
}
EXPORT_SYMBOL(audit_get_loginuid);
/**
* __audit_mq_open - record audit data for a POSIX MQ open
* @oflag: open flag

27
net/key/af_key.c
View file

@ -27,6 +27,7 @@
#include <linux/proc_fs.h>
#include <linux/init.h>
#include <net/xfrm.h>
#include <linux/audit.h>
#include <net/sock.h>
@ -1420,6 +1421,9 @@ static int pfkey_add(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr,
else
err = xfrm_state_update(x);
xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,
AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
if (err < 0) {
x->km.state = XFRM_STATE_DEAD;
__xfrm_state_put(x);
@ -1460,8 +1464,12 @@ static int pfkey_delete(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
err = -EPERM;
goto out;
}
err = xfrm_state_delete(x);
xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,
AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
if (err < 0)
goto out;
@ -1637,12 +1645,15 @@ static int pfkey_flush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hd
{
unsigned proto;
struct km_event c;
struct xfrm_audit audit_info;
proto = pfkey_satype2proto(hdr->sadb_msg_satype);
if (proto == 0)
return -EINVAL;
xfrm_state_flush(proto);
audit_info.loginuid = audit_get_loginuid(current->audit_context);
audit_info.secid = 0;
xfrm_state_flush(proto, &audit_info);
c.data.proto = proto;
c.seq = hdr->sadb_msg_seq;
c.pid = hdr->sadb_msg_pid;
@ -2205,6 +2216,9 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
hdr->sadb_msg_type != SADB_X_SPDUPDATE);
xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,
AUDIT_MAC_IPSEC_ADDSPD, err ? 0 : 1, xp, NULL);
if (err)
goto out;
@ -2282,6 +2296,10 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg
xp = xfrm_policy_bysel_ctx(XFRM_POLICY_TYPE_MAIN, pol->sadb_x_policy_dir-1,
&sel, tmp.security, 1);
security_xfrm_policy_free(&tmp);
xfrm_audit_log(audit_get_loginuid(current->audit_context), 0,
AUDIT_MAC_IPSEC_DELSPD, (xp) ? 1 : 0, xp, NULL);
if (xp == NULL)
return -ENOENT;
@ -2416,8 +2434,11 @@ static int key_notify_policy_flush(struct km_event *c)
static int pfkey_spdflush(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
{
struct km_event c;
struct xfrm_audit audit_info;
xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN);
audit_info.loginuid = audit_get_loginuid(current->audit_context);
audit_info.secid = 0;
xfrm_policy_flush(XFRM_POLICY_TYPE_MAIN, &audit_info);
c.data.type = XFRM_POLICY_TYPE_MAIN;
c.event = XFRM_MSG_FLUSHPOLICY;
c.pid = hdr->sadb_msg_pid;

120
net/xfrm/xfrm_policy.c
View file

@ -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;

17
net/xfrm/xfrm_state.c
View file

@ -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);

33
net/xfrm/xfrm_user.c
View file

@ -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);