diff options
Diffstat (limited to 'roles/core/base/vars/main.yml')
| -rw-r--r-- | roles/core/base/vars/main.yml | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/roles/core/base/vars/main.yml b/roles/core/base/vars/main.yml new file mode 100644 index 00000000..9940d7a6 --- /dev/null +++ b/roles/core/base/vars/main.yml @@ -0,0 +1,50 @@ +# SYSTEM CONFIGURATION +# ==================== +# These are not meant to be modified by the user + +# +# To adjust these settings use base_sysctl_config_user dict +# +base_sysctl_config: + + # Enable RFC-recommended source validation feature. + net.ipv4.conf.all.rp_filter: 1 + net.ipv4.conf.default.rp_filter: 1 + + # Log packets with impossible addresses to kernel log? yes + net.ipv4.conf.all.log_martians: 1 + net.ipv4.conf.default.log_martians: 1 + + # Reduce the surface on SMURF attacks. + # Make sure to ignore ECHO broadcasts, which are only required in broad network analysis. + net.ipv4.icmp_echo_ignore_broadcasts: 1 + + # There is no reason to accept bogus error responses from ICMP, so ignore them instead. + net.ipv4.icmp_ignore_bogus_error_responses: 1 + + # Limit the amount of traffic the system uses for ICMP. + net.ipv4.icmp_ratelimit: 1000 + + # Send redirects, if router, but this is just server + net.ipv4.conf.all.send_redirects: 0 + net.ipv4.conf.default.send_redirects: 0 + net.ipv4.conf.all.accept_redirects: 0 + net.ipv4.conf.default.accept_redirects: 0 + net.ipv6.conf.all.accept_redirects: 0 + net.ipv6.conf.default.accept_redirects: 0 + net.ipv4.conf.all.secure_redirects: 0 + net.ipv4.conf.default.secure_redirects: 0 + + net.ipv4.conf.all.accept_source_route: 0 + net.ipv4.conf.default.accept_source_route: 0 + + # Protect against wrapping sequence numbers at gigabit speeds + net.ipv4.tcp_timestamps: 0 + + # Prevent against the common 'syn flood attack' + net.ipv4.tcp_syncookies: 1 + + # Disable Selective Acknowledgement (SACK) + # Workaround CVE-2019-11477, CVE-2019-11478, CVE-2019-11479 + # See https://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md + net.ipv4.tcp_sack: 0 |