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[IPSEC]: SPD auditing fix to include the netmask/prefix-length 

Currently the netmask/prefix-length of an IPsec SPD entry is not included in
any of the SPD related audit messages.  This can cause a problem when the
audit log is examined as the netmask/prefix-length is vital in determining
what network traffic is affected by a particular SPD entry.  This patch fixes
this problem by adding two additional fields, "src_prefixlen" and
"dst_prefixlen", to the SPD audit messages to indicate the source and
destination netmasks.  These new fields are only included in the audit message
when the netmask/prefix-length is less than the address length, i.e. the SPD
entry applies to a network address and not a host address.

Example audit message:

 type=UNKNOWN[1415] msg=audit(1196105849.752:25): auid=0 \
   subj=root:system_r:unconfined_t:s0-s0:c0.c1023 op=SPD-add res=1 \
   src=192.168.0.0 src_prefixlen=24 dst=192.168.1.0 dst_prefixlen=24

In addition, this patch also fixes a few other things in the
xfrm_audit_common_policyinfo() function.  The IPv4 string formatting was
converted to use the standard NIPQUAD_FMT constant, the memcpy() was removed
from the IPv6 code path and replaced with a typecast (the memcpy() was acting
as a slow, implicit typecast anyway), and two local variables were created to
make referencing the XFRM security context and selector information cleaner.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Moore 2007-12-01 23:27:18 +11:00 committed by David S. Miller
parent 9108d5f4b2
commit 875179fa60
1 changed files with 27 additions and 19 deletions
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46
net/xfrm/xfrm_policy.c
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@ -2266,29 +2266,37 @@ void __init xfrm_init(void)
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);
struct xfrm_sec_ctx *ctx = xp->security;
struct xfrm_selector *sel = &xp->selector;
switch(xp->selector.family) {
if (ctx)
audit_log_format(audit_buf, " sec_alg=%u sec_doi=%u sec_obj=%s",
ctx->ctx_alg, ctx->ctx_doi, ctx->ctx_str);
switch(sel->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));
audit_log_format(audit_buf, " src=" NIPQUAD_FMT,
NIPQUAD(sel->saddr.a4));
if (sel->prefixlen_s != 32)
audit_log_format(audit_buf, " src_prefixlen=%d",
sel->prefixlen_s);
audit_log_format(audit_buf, " dst=" NIPQUAD_FMT,
NIPQUAD(sel->daddr.a4));
if (sel->prefixlen_d != 32)
audit_log_format(audit_buf, " dst_prefixlen=%d",
sel->prefixlen_d);
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));
}
audit_log_format(audit_buf, " src=" NIP6_FMT,
NIP6(*(struct in6_addr *)sel->saddr.a6));
if (sel->prefixlen_s != 128)
audit_log_format(audit_buf, " src_prefixlen=%d",
sel->prefixlen_s);
audit_log_format(audit_buf, " dst=" NIP6_FMT,
NIP6(*(struct in6_addr *)sel->daddr.a6));
if (sel->prefixlen_d != 128)
audit_log_format(audit_buf, " dst_prefixlen=%d",
sel->prefixlen_d);
break;
}
}