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netfilter: nf_tables: Audit log rule reset

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Resetting rules' stateful data happens outside of the transaction logic,
so 'get' and 'dump' handlers have to emit audit log entries themselves.

Fixes: 8daa8fde3f ("netfilter: nf_tables: Introduce NFT_MSG_GETRULE_RESET")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2023-08-29 19:51:58 +02:00 committed by Pablo Neira Ayuso
parent 7e9be1124d
commit ea078ae910
3 changed files with 20 additions and 0 deletions
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1
include/linux/audit.h
View File

@ -118,6 +118,7 @@ enum audit_nfcfgop {
AUDIT_NFT_OP_FLOWTABLE_REGISTER,
AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
AUDIT_NFT_OP_SETELEM_RESET,
AUDIT_NFT_OP_RULE_RESET,
AUDIT_NFT_OP_INVALID,
};

1
kernel/auditsc.c
View File

@ -144,6 +144,7 @@ static const struct audit_nfcfgop_tab audit_nfcfgs[] = {
{ AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" },
{ AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" },
{ AUDIT_NFT_OP_SETELEM_RESET, "nft_reset_setelem" },
{ AUDIT_NFT_OP_RULE_RESET, "nft_reset_rule" },
{ AUDIT_NFT_OP_INVALID, "nft_invalid" },
};

18
net/netfilter/nf_tables_api.c
View File

@ -3422,6 +3422,18 @@ err:
nfnetlink_set_err(ctx->net, ctx->portid, NFNLGRP_NFTABLES, -ENOBUFS);
}
static void audit_log_rule_reset(const struct nft_table *table,
unsigned int base_seq,
unsigned int nentries)
{
char *buf = kasprintf(GFP_ATOMIC, "%s:%u",
table->name, base_seq);
audit_log_nfcfg(buf, table->family, nentries,
AUDIT_NFT_OP_RULE_RESET, GFP_ATOMIC);
kfree(buf);
}
struct nft_rule_dump_ctx {
char *table;
char *chain;
@ -3528,6 +3540,9 @@ static int nf_tables_dump_rules(struct sk_buff *skb,
done:
rcu_read_unlock();
if (reset && idx > cb->args[0])
audit_log_rule_reset(table, cb->seq, idx - cb->args[0]);
cb->args[0] = idx;
return skb->len;
}
@ -3635,6 +3650,9 @@ static int nf_tables_getrule(struct sk_buff *skb, const struct nfnl_info *info,
if (err < 0)
goto err_fill_rule_info;
if (reset)
audit_log_rule_reset(table, nft_pernet(net)->base_seq, 1);
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
err_fill_rule_info: