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netfilter: nf_tables: Deduplicate nft_register_obj audit logs 

When adding/updating an object, the transaction handler emits suitable
audit log entries already, the one in nft_obj_notify() is redundant. To
fix that (and retain the audit logging from objects' 'update' callback),
Introduce an "audit log free" variant for internal use.

Fixes: c520292f29 ("audit: log nftables configuration change events once per table")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Acked-by: Paul Moore <paul@paul-moore.com> (Audit)
Signed-off-by: Florian Westphal <fw@strlen.de>
This commit is contained in:
Phil Sutter 2023-09-23 03:53:50 +02:00 committed by Florian Westphal
parent 203bb9d398
commit 0d880dc6f0
2 changed files with 48 additions and 16 deletions
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44
net/netfilter/nf_tables_api.c
View File

@ -7871,24 +7871,14 @@ static int nf_tables_delobj(struct sk_buff *skb, const struct nfnl_info *info,
return nft_delobj(&ctx, obj);
}
void nft_obj_notify(struct net *net, const struct nft_table *table,
struct nft_object *obj, u32 portid, u32 seq, int event,
u16 flags, int family, int report, gfp_t gfp)
static void
__nft_obj_notify(struct net *net, const struct nft_table *table,
struct nft_object *obj, u32 portid, u32 seq, int event,
u16 flags, int family, int report, gfp_t gfp)
{
struct nftables_pernet *nft_net = nft_pernet(net);
struct sk_buff *skb;
int err;
char *buf = kasprintf(gfp, "%s:%u",
table->name, nft_net->base_seq);
audit_log_nfcfg(buf,
family,
obj->handle,
event == NFT_MSG_NEWOBJ ?
AUDIT_NFT_OP_OBJ_REGISTER :
AUDIT_NFT_OP_OBJ_UNREGISTER,
gfp);
kfree(buf);
if (!report &&
!nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
@ -7911,13 +7901,35 @@ void nft_obj_notify(struct net *net, const struct nft_table *table,
err:
nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
void nft_obj_notify(struct net *net, const struct nft_table *table,
struct nft_object *obj, u32 portid, u32 seq, int event,
u16 flags, int family, int report, gfp_t gfp)
{
struct nftables_pernet *nft_net = nft_pernet(net);
char *buf = kasprintf(gfp, "%s:%u",
table->name, nft_net->base_seq);
audit_log_nfcfg(buf,
family,
obj->handle,
event == NFT_MSG_NEWOBJ ?
AUDIT_NFT_OP_OBJ_REGISTER :
AUDIT_NFT_OP_OBJ_UNREGISTER,
gfp);
kfree(buf);
__nft_obj_notify(net, table, obj, portid, seq, event,
flags, family, report, gfp);
}
EXPORT_SYMBOL_GPL(nft_obj_notify);
static void nf_tables_obj_notify(const struct nft_ctx *ctx,
struct nft_object *obj, int event)
{
nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid, ctx->seq, event,
ctx->flags, ctx->family, ctx->report, GFP_KERNEL);
__nft_obj_notify(ctx->net, ctx->table, obj, ctx->portid,
ctx->seq, event, ctx->flags, ctx->family,
ctx->report, GFP_KERNEL);
}
/*

20
tools/testing/selftests/netfilter/nft_audit.sh
View File

@ -85,6 +85,26 @@ do_test "nft add set t1 s2 $setblock; add set t1 s3 { $settype; }" \
do_test "nft add element t1 s3 $setelem" \
"table=t1 family=2 entries=3 op=nft_register_setelem"
# adding counters
do_test 'nft add counter t1 c1' \
'table=t1 family=2 entries=1 op=nft_register_obj'
do_test 'nft add counter t2 c1; add counter t2 c2' \
'table=t2 family=2 entries=2 op=nft_register_obj'
# adding/updating quotas
do_test 'nft add quota t1 q1 { 10 bytes }' \
'table=t1 family=2 entries=1 op=nft_register_obj'
do_test 'nft add quota t2 q1 { 10 bytes }; add quota t2 q2 { 10 bytes }' \
'table=t2 family=2 entries=2 op=nft_register_obj'
# changing the quota value triggers obj update path
do_test 'nft add quota t1 q1 { 20 bytes }' \
'table=t1 family=2 entries=1 op=nft_register_obj'
# resetting rules
do_test 'nft reset rules t1 c2' \