feat: enable SELinux

Enable SELinux LSM, however do not enable enforcing mode by default until userspace is ready. Permissive mode should be limited to logging thus not break anything. Signed-off-by: Dmitry Sharshakov <[email protected]>
siderolabs · Apr 22, 2024 · 718a7da · 718a7da
1 parent 207481f
commit 718a7da
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Showing 3 changed files with 21 additions and 5 deletions.
diff --git a/kernel/build/config-amd64 b/kernel/build/config-amd64
@@ -16,7 +16,6 @@ CONFIG_CC_CAN_LINK_STATIC=y
 CONFIG_CC_HAS_ASM_GOTO_OUTPUT=y
 CONFIG_CC_HAS_ASM_GOTO_TIED_OUTPUT=y
 CONFIG_GCC_ASM_GOTO_OUTPUT_WORKAROUND=y
-CONFIG_TOOLS_SUPPORT_RELR=y
 CONFIG_CC_HAS_ASM_INLINE=y
 CONFIG_CC_HAS_NO_PROFILE_FN_ATTR=y
 CONFIG_PAHOLE_VERSION=126
@@ -5647,10 +5646,17 @@ CONFIG_SECURITY_NETWORK=y
 CONFIG_SECURITY_NETWORK_XFRM=y
 CONFIG_SECURITY_PATH=y
 # CONFIG_INTEL_TXT is not set
+CONFIG_LSM_MMAP_MIN_ADDR=65536
 CONFIG_HARDENED_USERCOPY=y
 CONFIG_FORTIFY_SOURCE=y
 # CONFIG_STATIC_USERMODEHELPER is not set
-# CONFIG_SECURITY_SELINUX is not set
+CONFIG_SECURITY_SELINUX=y
+# CONFIG_SECURITY_SELINUX_BOOTPARAM is not set
+CONFIG_SECURITY_SELINUX_DEVELOP=y
+CONFIG_SECURITY_SELINUX_AVC_STATS=y
+CONFIG_SECURITY_SELINUX_SIDTAB_HASH_BITS=9
+CONFIG_SECURITY_SELINUX_SID2STR_CACHE_SIZE=256
+# CONFIG_SECURITY_SELINUX_DEBUG is not set
 # CONFIG_SECURITY_SMACK is not set
 # CONFIG_SECURITY_TOMOYO is not set
 CONFIG_SECURITY_APPARMOR=y
@@ -5701,9 +5707,10 @@ CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS=y
 CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT=y
 # CONFIG_IMA_DISABLE_HTABLE is not set
 # CONFIG_EVM is not set
+# CONFIG_DEFAULT_SECURITY_SELINUX is not set
 # CONFIG_DEFAULT_SECURITY_APPARMOR is not set
 CONFIG_DEFAULT_SECURITY_DAC=y
-CONFIG_LSM="yama,loadpin,safesetid,integrity,bpf,apparmor"
+CONFIG_LSM="yama,selinux,loadpin,safesetid,integrity,bpf,apparmor"
 
 #
 # Kernel hardening options

diff --git a/kernel/build/config-arm64 b/kernel/build/config-arm64
@@ -8297,10 +8297,17 @@ CONFIG_SECURITY_NETWORK=y
 # CONFIG_SECURITY_INFINIBAND is not set
 CONFIG_SECURITY_NETWORK_XFRM=y
 CONFIG_SECURITY_PATH=y
+CONFIG_LSM_MMAP_MIN_ADDR=32768
 CONFIG_HARDENED_USERCOPY=y
 CONFIG_FORTIFY_SOURCE=y
 # CONFIG_STATIC_USERMODEHELPER is not set
-# CONFIG_SECURITY_SELINUX is not set
+CONFIG_SECURITY_SELINUX=y
+# CONFIG_SECURITY_SELINUX_BOOTPARAM is not set
+CONFIG_SECURITY_SELINUX_DEVELOP=y
+CONFIG_SECURITY_SELINUX_AVC_STATS=y
+CONFIG_SECURITY_SELINUX_SIDTAB_HASH_BITS=9
+CONFIG_SECURITY_SELINUX_SID2STR_CACHE_SIZE=256
+# CONFIG_SECURITY_SELINUX_DEBUG is not set
 # CONFIG_SECURITY_SMACK is not set
 # CONFIG_SECURITY_TOMOYO is not set
 CONFIG_SECURITY_APPARMOR=y
@@ -8351,9 +8358,10 @@ CONFIG_IMA_QUEUE_EARLY_BOOT_KEYS=y
 CONFIG_IMA_SECURE_AND_OR_TRUSTED_BOOT=y
 # CONFIG_IMA_DISABLE_HTABLE is not set
 # CONFIG_EVM is not set
+# CONFIG_DEFAULT_SECURITY_SELINUX is not set
 # CONFIG_DEFAULT_SECURITY_APPARMOR is not set
 CONFIG_DEFAULT_SECURITY_DAC=y
-CONFIG_LSM="yama,loadpin,safesetid,integrity,bpf,apparmor"
+CONFIG_LSM="yama,selinux,loadpin,safesetid,integrity,bpf,apparmor"
 
 #
 # Kernel hardening options

diff --git a/kernel/build/scripts/filter-hardened-check.py b/kernel/build/scripts/filter-hardened-check.py
@@ -28,6 +28,7 @@
     'CONFIG_UBSAN_TRAP', # disabled due to performance reasons
     'CONFIG_CFI_CLANG', # SideroLabs toolchain uses gcc, investigae more, see https://github.com/siderolabs/pkgs/issues/918
     'CONFIG_CFI_PERMISSIVE', # SideroLabs toolchain uses gcc, investigae more, see https://github.com/siderolabs/pkgs/issues/91
+    'CONFIG_SECURITY_SELINUX_DEVELOP', # SELinux enabled, but permissive unless enforcing=1. TODO: force enforcing mode when complete
 }
 
 """