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authorChristian Pointner <equinox@spreadspace.org>2020-05-31 23:12:36 +0200
committerChristian Pointner <equinox@spreadspace.org>2020-05-31 23:12:36 +0200
commit3a2319c9c58886a7938deabafc66ad4bc128c9f8 (patch)
tree222b41b5b49633b9156c070df830d5c73617edd7 /roles/core/base/vars/main.yml
parentchaos-at-home: deploy apt-repo/base to some more hosts (diff)
move core roles to subdir
Diffstat (limited to 'roles/core/base/vars/main.yml')
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1 files changed, 50 insertions, 0 deletions
diff --git a/roles/core/base/vars/main.yml b/roles/core/base/vars/main.yml
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+# 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