Merge pull request #76 from flawedworld/patch-2

Add IPv6 sysctl options and enforce kernel.perf_event_paranoid=3

etc/sysctl.d/30_security-misc.conf

@@ -82,6 +82,8 @@ net.ipv6.conf.default.accept_redirects=0
 ## Disables ICMP redirect sending.
 net.ipv4.conf.all.send_redirects=0
 net.ipv4.conf.default.send_redirects=0
+net.ipv6.conf.all.accept_redirects=0
+net.ipv6.conf.default.accept_redirects=0
 
 ## Ignores ICMP requests.
 net.ipv4.icmp_echo_ignore_all=1
@@ -92,6 +94,8 @@ net.ipv4.tcp_syncookies=1
 ## Disable source routing.
 net.ipv4.conf.all.accept_source_route=0
 net.ipv4.conf.default.accept_source_route=0
+net.ipv6.conf.all.accept_source_route=0
+net.ipv6.conf.default.accept_source_route=0
 
 ## Enable reverse path filtering to prevent IP spoofing and
 ## mitigate vulnerabilities such as CVE-2019-14899.
@@ -145,3 +149,12 @@ vm.unprivileged_userfaultfd=0
 ## - https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Performance_Tuning_Guide/s-memory-tunables.html
 ## - https://en.wikipedia.org/wiki/Swappiness
 vm.swappiness=1
+
+## Disallow kernel profiling by users without CAP_SYS_ADMIN
+## https://www.kernel.org/doc/Documentation/sysctl/kernel.txt
+kernel.perf_event_paranoid=3
+
+# Do not accept router advertisments
+net.ipv6.conf.all.accept_ra=0
+net.ipv6.conf.default.accept_ra=0
+