From d0febd81ae77a0e13717f1412ff9589e43fc4f8b Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Wed, 11 Mar 2020 20:52:01 +0100 Subject: [PATCH] netfilter: conntrack: re-visit sysctls in unprivileged namespaces since commit b884fa46177659 ("netfilter: conntrack: unify sysctl handling") conntrack no longer exposes most of its sysctls (e.g. tcp timeouts settings) to network namespaces that are not owned by the initial user namespace. This patch exposes all sysctls even if the namespace is unpriviliged. compared to a 4.19 kernel, the newly visible and writeable sysctls are: net.netfilter.nf_conntrack_acct net.netfilter.nf_conntrack_timestamp .. to allow to enable accouting and timestamp extensions. net.netfilter.nf_conntrack_events .. to turn off conntrack event notifications. net.netfilter.nf_conntrack_checksum .. to disable checksum validation. net.netfilter.nf_conntrack_log_invalid .. to enable logging of packets deemed invalid by conntrack. newly visible sysctls that are only exported as read-only: net.netfilter.nf_conntrack_count .. current number of conntrack entries living in this netns. net.netfilter.nf_conntrack_max .. global upperlimit (maximum size of the table). net.netfilter.nf_conntrack_buckets .. size of the conntrack table (hash buckets). net.netfilter.nf_conntrack_expect_max .. maximum number of permitted expectations in this netns. net.netfilter.nf_conntrack_helper .. conntrack helper auto assignment. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_standalone.c | 19 ++++++++----------- 1 file changed, 8 insertions(+), 11 deletions(-) diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c index 4912069627b6..9b57330c81f8 100644 --- a/net/netfilter/nf_conntrack_standalone.c +++ b/net/netfilter/nf_conntrack_standalone.c @@ -1054,21 +1054,18 @@ static int nf_conntrack_standalone_init_sysctl(struct net *net) nf_conntrack_standalone_init_dccp_sysctl(net, table); nf_conntrack_standalone_init_gre_sysctl(net, table); - /* Don't export sysctls to unprivileged users */ + /* Don't allow unprivileged users to alter certain sysctls */ if (net->user_ns != &init_user_ns) { - table[NF_SYSCTL_CT_MAX].procname = NULL; - table[NF_SYSCTL_CT_ACCT].procname = NULL; - table[NF_SYSCTL_CT_HELPER].procname = NULL; -#ifdef CONFIG_NF_CONNTRACK_TIMESTAMP - table[NF_SYSCTL_CT_TIMESTAMP].procname = NULL; -#endif + table[NF_SYSCTL_CT_MAX].mode = 0444; + table[NF_SYSCTL_CT_EXPECT_MAX].mode = 0444; + table[NF_SYSCTL_CT_HELPER].mode = 0444; #ifdef CONFIG_NF_CONNTRACK_EVENTS - table[NF_SYSCTL_CT_EVENTS].procname = NULL; + table[NF_SYSCTL_CT_EVENTS].mode = 0444; #endif - } - - if (!net_eq(&init_net, net)) table[NF_SYSCTL_CT_BUCKETS].mode = 0444; + } else if (!net_eq(&init_net, net)) { + table[NF_SYSCTL_CT_BUCKETS].mode = 0444; + } net->ct.sysctl_header = register_net_sysctl(net, "net/netfilter", table); if (!net->ct.sysctl_header) -- 2.30.2