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netfilter: add audit table unregister actions

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Audit the action of unregistering ebtables and x_tables.

See: https://github.com/linux-audit/audit-kernel/issues/44

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
This commit is contained in:
Richard Guy Briggs 2020-04-22 17:39:29 -04:00 committed by Paul Moore
parent c4dad0aab3
commit a45d88530b
4 changed files with 8 additions and 2 deletions
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1
include/linux/audit.h
View File

@ -97,6 +97,7 @@ struct audit_ntp_data {};
enum audit_nfcfgop {
AUDIT_XT_OP_REGISTER,
AUDIT_XT_OP_REPLACE,
AUDIT_XT_OP_UNREGISTER,
};
extern int is_audit_feature_set(int which);

5
kernel/auditsc.c
View File

@ -136,8 +136,9 @@ struct audit_nfcfgop_tab {
};
const struct audit_nfcfgop_tab audit_nfcfgs[] = {
{ AUDIT_XT_OP_REGISTER, "register" },
{ AUDIT_XT_OP_REPLACE, "replace" },
{ AUDIT_XT_OP_REGISTER, "register" },
{ AUDIT_XT_OP_REPLACE, "replace" },
{ AUDIT_XT_OP_UNREGISTER, "unregister" },
};
static int audit_match_perm(struct audit_context *ctx, int mask)

2
net/bridge/netfilter/ebtables.c
View File

@ -1124,6 +1124,8 @@ static void __ebt_unregister_table(struct net *net, struct ebt_table *table)
mutex_lock(&ebt_mutex);
list_del(&table->list);
mutex_unlock(&ebt_mutex);
audit_log_nfcfg(table->name, AF_BRIDGE, table->private->nentries,
AUDIT_XT_OP_UNREGISTER);
EBT_ENTRY_ITERATE(table->private->entries, table->private->entries_size,
ebt_cleanup_entry, net, NULL);
if (table->private->nentries)

2
net/netfilter/x_tables.c
View File

@ -1472,6 +1472,8 @@ void *xt_unregister_table(struct xt_table *table)
private = table->private;
list_del(&table->list);
mutex_unlock(&xt[table->af].mutex);
audit_log_nfcfg(table->name, table->af, private->number,
AUDIT_XT_OP_UNREGISTER);
kfree(table);
return private;