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netfilter: nf_ct_helper: disable automatic helper assignment

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Four years ago we introduced a new sysctl knob to disable automatic
helper assignment in 72110dfaa907 ("netfilter: nf_ct_helper: disable
automatic helper assignment"). This knob kept this behaviour enabled by
default to remain conservative.

This measure was introduced to provide a secure way to configure
iptables and connection tracking helpers through explicit rules.

Give the time we have waited for this, let's turn off this by default
now, worse case users still have a chance to recover the former
behaviour by explicitly enabling this back through sysctl.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2016-04-14 17:13:41 +02:00
parent e701001e7c
commit 3bb398d925
1 changed files with 2 additions and 2 deletions
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4
net/netfilter/nf_conntrack_helper.c
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@ -38,10 +38,10 @@ unsigned int nf_ct_helper_hsize __read_mostly;
EXPORT_SYMBOL_GPL(nf_ct_helper_hsize); EXPORT_SYMBOL_GPL(nf_ct_helper_hsize);
static unsigned int nf_ct_helper_count __read_mostly; static unsigned int nf_ct_helper_count __read_mostly;
static bool nf_ct_auto_assign_helper __read_mostly = true; static bool nf_ct_auto_assign_helper __read_mostly = false;
module_param_named(nf_conntrack_helper, nf_ct_auto_assign_helper, bool, 0644); module_param_named(nf_conntrack_helper, nf_ct_auto_assign_helper, bool, 0644);
MODULE_PARM_DESC(nf_conntrack_helper, MODULE_PARM_DESC(nf_conntrack_helper,
"Enable automatic conntrack helper assignment (default 1)"); "Enable automatic conntrack helper assignment (default 0)");
#ifdef CONFIG_SYSCTL #ifdef CONFIG_SYSCTL
static struct ctl_table helper_sysctl_table[] = { static struct ctl_table helper_sysctl_table[] = {