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audit: tidy and extend netfilter_cfg x_tables

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NETFILTER_CFG record generation was inconsistent for x_tables and
ebtables configuration changes.  The call was needlessly messy and there
were supporting records missing at times while they were produced when
not requested.  Simplify the logging call into a new audit_log_nfcfg
call.  Honour the audit_enabled setting while more consistently
recording information including supporting records by tidying up dummy
checks.

Add an op= field that indicates the operation being performed (register
or replace).

Here is the enhanced sample record:
  type=NETFILTER_CFG msg=audit(1580905834.919:82970): table=filter family=2 entries=83 op=replace

Generate audit NETFILTER_CFG records on ebtables table registration.
Previously this was being done for x_tables registration and replacement
operations and ebtables table replacement only.

See: https://github.com/linux-audit/audit-kernel/issues/25
See: https://github.com/linux-audit/audit-kernel/issues/35
See: https://github.com/linux-audit/audit-kernel/issues/43

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 17:39:28 -04:00 committed by Paul Moore
parent 9d2161bed4
commit c4dad0aab3
4 changed files with 52 additions and 17 deletions
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21
include/linux/audit.h
View File

@ -94,6 +94,11 @@ struct audit_ntp_data {
struct audit_ntp_data {};
#endif
enum audit_nfcfgop {
AUDIT_XT_OP_REGISTER,
AUDIT_XT_OP_REPLACE,
};
extern int is_audit_feature_set(int which);
extern int __init audit_register_class(int class, unsigned *list);
@ -379,6 +384,8 @@ extern void __audit_log_kern_module(char *name);
extern void __audit_fanotify(unsigned int response);
extern void __audit_tk_injoffset(struct timespec64 offset);
extern void __audit_ntp_log(const struct audit_ntp_data *ad);
extern void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
enum audit_nfcfgop op);
static inline void audit_ipc_obj(struct kern_ipc_perm *ipcp)
{
@ -514,6 +521,14 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad)
__audit_ntp_log(ad);
}
static inline void audit_log_nfcfg(const char *name, u8 af,
unsigned int nentries,
enum audit_nfcfgop op)
{
if (audit_enabled)
__audit_log_nfcfg(name, af, nentries, op);
}
extern int audit_n_rules;
extern int audit_signals;
#else /* CONFIG_AUDITSYSCALL */
@ -646,6 +661,12 @@ static inline void audit_ntp_log(const struct audit_ntp_data *ad)
static inline void audit_ptrace(struct task_struct *t)
{ }
static inline void audit_log_nfcfg(const char *name, u8 af,
unsigned int nentries,
enum audit_nfcfgop op)
{ }
#define audit_n_rules 0
#define audit_signals 0
#endif /* CONFIG_AUDITSYSCALL */

24
kernel/auditsc.c
View File

@ -130,6 +130,16 @@ struct audit_tree_refs {
struct audit_chunk *c[31];
};
struct audit_nfcfgop_tab {
enum audit_nfcfgop op;
const char *s;
};
const struct audit_nfcfgop_tab audit_nfcfgs[] = {
{ AUDIT_XT_OP_REGISTER, "register" },
{ AUDIT_XT_OP_REPLACE, "replace" },
};
static int audit_match_perm(struct audit_context *ctx, int mask)
{
unsigned n;
@ -2542,6 +2552,20 @@ void __audit_ntp_log(const struct audit_ntp_data *ad)
audit_log_ntp_val(ad, "adjust", AUDIT_NTP_ADJUST);
}
void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
enum audit_nfcfgop op)
{
struct audit_buffer *ab;
ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_NETFILTER_CFG);
if (!ab)
return;
audit_log_format(ab, "table=%s family=%u entries=%u op=%s",
name, af, nentries, audit_nfcfgs[op].s);
audit_log_end(ab);
}
EXPORT_SYMBOL_GPL(__audit_log_nfcfg);
static void audit_log_task(struct audit_buffer *ab)
{
kuid_t auid, uid;

12
net/bridge/netfilter/ebtables.c
View File

@ -1046,14 +1046,8 @@ static int do_replace_finish(struct net *net, struct ebt_replace *repl,
vfree(table);
vfree(counterstmp);
#ifdef CONFIG_AUDIT
if (audit_enabled) {
audit_log(audit_context(), GFP_KERNEL,
AUDIT_NETFILTER_CFG,
"table=%s family=%u entries=%u",
repl->name, AF_BRIDGE, repl->nentries);
}
#endif
audit_log_nfcfg(repl->name, AF_BRIDGE, repl->nentries,
AUDIT_XT_OP_REPLACE);
return ret;
free_unlock:
@ -1223,6 +1217,8 @@ int ebt_register_table(struct net *net, const struct ebt_table *input_table,
*res = NULL;
}
audit_log_nfcfg(repl->name, AF_BRIDGE, repl->nentries,
AUDIT_XT_OP_REGISTER);
return ret;
free_unlock:
mutex_unlock(&ebt_mutex);

12
net/netfilter/x_tables.c
View File

@ -1408,15 +1408,9 @@ xt_replace_table(struct xt_table *table,
}
}
#ifdef CONFIG_AUDIT
if (audit_enabled) {
audit_log(audit_context(), GFP_KERNEL,
AUDIT_NETFILTER_CFG,
"table=%s family=%u entries=%u",
table->name, table->af, private->number);
}
#endif
audit_log_nfcfg(table->name, table->af, private->number,
!private->number ? AUDIT_XT_OP_REGISTER :
AUDIT_XT_OP_REPLACE);
return private;
}
EXPORT_SYMBOL_GPL(xt_replace_table);