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From 2275e47e111ba89595658f5d91964454c1a65323 Mon Sep 17 00:00:00 2001
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From: Watson Sato <wsato@redhat.com>
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Date: Wed, 4 May 2022 19:21:04 +0200
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Subject: [PATCH 1/2] Add tests to ensure valid symlinks are checked
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These sysctl tests help check cases when:
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- A symlink points to a file out of the default default dirs
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- Multile symlinks point to the same file in the default dirs
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Symlinks are a valid use case how to configure sysctls.
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---
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.../tests/symlink_root_duplicate.fail.sh | 15 +++++++++++++++
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.../tests/symlink_root_incompliant.fail.sh | 15 +++++++++++++++
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.../tests/symlinks_to_same_file.pass.sh | 14 ++++++++++++++
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3 files changed, 44 insertions(+)
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create mode 100644 linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_duplicate.fail.sh
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create mode 100644 linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_incompliant.fail.sh
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create mode 100644 linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlinks_to_same_file.pass.sh
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diff --git a/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_duplicate.fail.sh b/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_duplicate.fail.sh
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new file mode 100644
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index 00000000000..c4f756a110f
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--- /dev/null
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+++ b/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_duplicate.fail.sh
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@@ -0,0 +1,15 @@
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+#!/bin/bash
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+
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+# Clean sysctl config directories
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+rm -rf /usr/lib/sysctl.d/* /run/sysctl.d/* /etc/sysctl.d/*
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+
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+sed -i "/net.ipv4.conf.default.accept_source_route/d" /etc/sysctl.conf
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+echo "net.ipv4.conf.default.accept_source_route = 0" >> /etc/sysctl.conf
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+
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+# Put a config file out of the default dirs
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+echo "net.ipv4.conf.default.accept_source_route = 0" >> /root/root-sysctl.conf
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+
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+# Add a symlink
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+ln -s /root/root-sysctl.conf /etc/sysctl.d/90-root.conf
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+
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+sysctl -w net.ipv4.conf.default.accept_source_route=0
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diff --git a/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_incompliant.fail.sh b/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_incompliant.fail.sh
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new file mode 100644
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index 00000000000..3b67676ac69
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--- /dev/null
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+++ b/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlink_root_incompliant.fail.sh
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@@ -0,0 +1,15 @@
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+#!/bin/bash
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+
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+# Clean sysctl config directories
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+rm -rf /usr/lib/sysctl.d/* /run/sysctl.d/* /etc/sysctl.d/*
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+
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+sed -i "/net.ipv4.conf.default.accept_source_route/d" /etc/sysctl.conf
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+echo "net.ipv4.conf.default.accept_source_route = 0" >> /etc/sysctl.conf
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+
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+# Put a config file out of the default dirs
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+echo "net.ipv4.conf.default.accept_source_route = 1" >> /root/root-sysctl.conf
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+
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+# Add a symlink
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+ln -s /root/root-sysctl.conf /etc/sysctl.d/90-root.conf
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+
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+sysctl -w net.ipv4.conf.default.accept_source_route=0
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diff --git a/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlinks_to_same_file.pass.sh b/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlinks_to_same_file.pass.sh
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new file mode 100644
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index 00000000000..6164d0b1ca9
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--- /dev/null
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+++ b/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_conf_default_accept_source_route/tests/symlinks_to_same_file.pass.sh
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@@ -0,0 +1,14 @@
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+#!/bin/bash
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+
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+# Clean sysctl config directories
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+rm -rf /usr/lib/sysctl.d/* /run/sysctl.d/* /etc/sysctl.d/*
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+
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+sed -i "/net.ipv4.conf.default.accept_source_route/d" /etc/sysctl.conf
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+echo "net.ipv4.conf.default.accept_source_route = 0" >> /etc/sysctl.conf
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+
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+# Multiple symliks to the same file should be ignored
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+ln -s /etc/sysctl.conf /etc/sysctl.d/90-sysctl.conf
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+ln -s /etc/sysctl.conf /etc/sysctl.d/99-sysctl.conf
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+
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+sysctl -w net.ipv4.conf.default.accept_source_route=0
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+
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From 4f4bb24620338b2ff8f59d173b575d2089618357 Mon Sep 17 00:00:00 2001
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From: Watson Sato <wsato@redhat.com>
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Date: Wed, 4 May 2022 19:23:41 +0200
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Subject: [PATCH 2/2] Filter out symlinks referencing default dirs
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Apply a filter on the collected symlinks and exclude the ones that
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don't point to the default dirs.
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In other words, only remove ignore options in symlinks if the files they
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reference will be scanned anyway, because they are in the one of the
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default dirs.
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---
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shared/templates/sysctl/oval.template | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/shared/templates/sysctl/oval.template b/shared/templates/sysctl/oval.template
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index 0b5cde45045..ac395d545c3 100644
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--- a/shared/templates/sysctl/oval.template
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+++ b/shared/templates/sysctl/oval.template
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@@ -217,10 +217,20 @@
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Workaround by querying for all conf files found -->
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- <unix:symlink_object comment="syctl symlinks" id="object_{{{ SYSCTLID }}}_symlinks" version="1">
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+ <unix:symlink_object comment="Symlinks referencing files in default dirs" id="object_{{{ SYSCTLID }}}_symlinks" version="1">
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<unix:filepath operation="equals" var_ref="local_var_conf_files_{{{ SYSCTLID }}}" />
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+ <filter action="exclude">state_symlink_points_outside_usual_dirs_{{{ SYSCTLID }}}</filter>
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</unix:symlink_object>
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+
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+ ^/etc/sysctl.conf$
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+ ^/etc/sysctl.d/.*$
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+ ^/run/sysctl.d/.*$
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+ ^/usr/lib/sysctl.d/.*$ -->
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+ <unix:symlink_state comment="State that matches symlinks referencing files not in the default dirs" id="state_symlink_points_outside_usual_dirs_{{{ SYSCTLID }}}" version="1">
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+ <unix:canonical_path operation="pattern match">^(?!(\/etc\/sysctl\.conf$|(\/etc|\/run|\/usr\/lib)\/sysctl\.d\/)).*$</unix:canonical_path>
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+ </unix:symlink_state>
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+
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<local_variable comment="List of conf files" datatype="string" id="local_var_conf_files_{{{ SYSCTLID }}}" version="1">
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<object_component object_ref="object_static_set_unfiltered_sysctls_{{{ SYSCTLID }}}" item_field="filepath" />
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</local_variable>
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