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-rw-r--r--puppet/services/kernel.yaml18
-rw-r--r--releasenotes/notes/disable-kernel-parameter-for-icmp-redirects-f325f91d71b58b5f.yaml19
-rw-r--r--releasenotes/notes/enable-logging-suspicious-packets-d5545586f917d2ca.yaml9
3 files changed, 46 insertions, 0 deletions
diff --git a/puppet/services/kernel.yaml b/puppet/services/kernel.yaml
index ee4c771f..380fb882 100644
--- a/puppet/services/kernel.yaml
+++ b/puppet/services/kernel.yaml
@@ -39,6 +39,20 @@ outputs:
value: 5
net.ipv4.tcp_keepalive_time:
value: 5
+ net.ipv4.conf.default.send_redirects:
+ value: 0
+ net.ipv4.conf.all.send_redirects:
+ value: 0
+ net.ipv4.conf.default.accept_redirects:
+ value: 0
+ net.ipv4.conf.default.secure_redirects:
+ value: 0
+ net.ipv4.conf.all.secure_redirects:
+ value: 0
+ net.ipv4.conf.default.log_martians:
+ value: 1
+ net.ipv4.conf.all.log_martians:
+ value: 1
net.nf_conntrack_max:
value: 500000
net.netfilter.nf_conntrack_max:
@@ -52,6 +66,10 @@ outputs:
value: 0
net.ipv6.conf.default.autoconf:
value: 0
+ net.ipv6.conf.default.accept_redirects:
+ value: 0
+ net.ipv6.conf.all.accept_redirects:
+ value: 0
net.core.netdev_max_backlog:
value: 10000
kernel.pid_max:
diff --git a/releasenotes/notes/disable-kernel-parameter-for-icmp-redirects-f325f91d71b58b5f.yaml b/releasenotes/notes/disable-kernel-parameter-for-icmp-redirects-f325f91d71b58b5f.yaml
new file mode 100644
index 00000000..0f226a84
--- /dev/null
+++ b/releasenotes/notes/disable-kernel-parameter-for-icmp-redirects-f325f91d71b58b5f.yaml
@@ -0,0 +1,19 @@
+---
+upgrade:
+ - The net.ipv4.conf.default.send_redirects & net.ipv4.conf.all.send_redirects
+ are now set to 0 to prevent a compromised host from sending invalid ICMP
+ redirects to other router devices.
+ - The net.ipv4.conf.default.accept_redirects,
+ net.ipv6.conf.default.accept_redirects & net.ipv6.conf.all.accept_redirects
+ are now set to 0 to prevent forged ICMP packet from altering host's routing
+ tables.
+ - The net.ipv4.conf.default.secure_redirects &
+ net.ipv4.conf.all.secure_redirects are now set to 0 to disable acceptance
+ of secure ICMP redirected packets.
+security:
+ - Invalide ICMP redirects may corrupt routing and have users access a system
+ set up by the attacker as opposed to a valid system.
+ - Routing tables may be altered by bogus ICMP redirect messages and send
+ packets to incorrect networks.
+ - Secure ICMP redirects are the same as ICMP redirects, except they come from
+ gateways listed on the default gateway list.
diff --git a/releasenotes/notes/enable-logging-suspicious-packets-d5545586f917d2ca.yaml b/releasenotes/notes/enable-logging-suspicious-packets-d5545586f917d2ca.yaml
new file mode 100644
index 00000000..bb2543f2
--- /dev/null
+++ b/releasenotes/notes/enable-logging-suspicious-packets-d5545586f917d2ca.yaml
@@ -0,0 +1,9 @@
+---
+upgrade:
+ - |
+ The net.ipv4.conf.default.log_martians & net.ipv4.conf.all.log_martians are
+ now set to 1 to enable logging of suspicious packets.
+security:
+ - |
+ Logging of suspicious packets allows an administrator to investigate the
+ spoofed packets sent to their system.