security/Kconfig

   1 #
   2 # Security configuration
   3 #
   4
   5 menu "Security options"
   6
   7 source security/keys/Kconfig
   8
   9 config SECURITY_DMESG_RESTRICT
  10         bool "Restrict unprivileged access to the kernel syslog"
  11         default n
  12         help
  13           This enforces restrictions on unprivileged users reading the kernel
  14           syslog via dmesg(8).
  15
  16           If this option is not selected, no restrictions will be enforced
  17           unless the dmesg_restrict sysctl is explicitly set to (1).
  18
  19           If you are unsure how to answer this question, answer N.
  20
  21 config SECURITY
  22         bool "Enable different security models"
  23         depends on SYSFS
  24         help
  25           This allows you to choose different security modules to be
  26           configured into your kernel.
  27
  28           If this option is not selected, the default Linux security
  29           model will be used.
  30
  31           If you are unsure how to answer this question, answer N.
  32
  33 config SECURITYFS
  34         bool "Enable the securityfs filesystem"
  35         help
  36           This will build the securityfs filesystem.  It is currently used by
  37           the TPM bios character driver and IMA, an integrity provider.  It is
  38           not used by SELinux or SMACK.
  39
  40           If you are unsure how to answer this question, answer N.
  41
  42 config SECURITY_NETWORK
  43         bool "Socket and Networking Security Hooks"
  44         depends on SECURITY
  45         help
  46           This enables the socket and networking security hooks.
  47           If enabled, a security module can use these hooks to
  48           implement socket and networking access controls.
  49           If you are unsure how to answer this question, answer N.
  50
  51 config SECURITY_NETWORK_XFRM
  52         bool "XFRM (IPSec) Networking Security Hooks"
  53         depends on XFRM && SECURITY_NETWORK
  54         help
  55           This enables the XFRM (IPSec) networking security hooks.
  56           If enabled, a security module can use these hooks to
  57           implement per-packet access controls based on labels
  58           derived from IPSec policy.  Non-IPSec communications are
  59           designated as unlabelled, and only sockets authorized
  60           to communicate unlabelled data can send without using
  61           IPSec.
  62           If you are unsure how to answer this question, answer N.
  63
  64 config SECURITY_PATH
  65         bool "Security hooks for pathname based access control"
  66         depends on SECURITY
  67         help
  68           This enables the security hooks for pathname based access control.
  69           If enabled, a security module can use these hooks to
  70           implement pathname based access controls.
  71           If you are unsure how to answer this question, answer N.
  72
  73 config INTEL_TXT
  74         bool "Enable Intel(R) Trusted Execution Technology (Intel(R) TXT)"
  75         depends on HAVE_INTEL_TXT
  76         help
  77           This option enables support for booting the kernel with the
  78           Trusted Boot (tboot) module. This will utilize
  79           Intel(R) Trusted Execution Technology to perform a measured launch
  80           of the kernel. If the system does not support Intel(R) TXT, this
  81           will have no effect.
  82
  83           Intel TXT will provide higher assurance of system configuration and
  84           initial state as well as data reset protection.  This is used to
  85           create a robust initial kernel measurement and verification, which
  86           helps to ensure that kernel security mechanisms are functioning
  87           correctly. This level of protection requires a root of trust outside
  88           of the kernel itself.
  89
  90           Intel TXT also helps solve real end user concerns about having
  91           confidence that their hardware is running the VMM or kernel that
  92           it was configured with, especially since they may be responsible for
  93           providing such assurances to VMs and services running on it.
  94
  95           See <http://www.intel.com/technology/security/> for more information
  96           about Intel(R) TXT.
  97           See <http://tboot.sourceforge.net> for more information about tboot.
  98           See Documentation/intel_txt.txt for a description of how to enable
  99           Intel TXT support in a kernel boot.
 100
 101           If you are unsure as to whether this is required, answer N.
 102
 103 config LSM_MMAP_MIN_ADDR
 104         int "Low address space for LSM to protect from user allocation"
 105         depends on SECURITY && SECURITY_SELINUX
 106         default 32768 if ARM || (ARM64 && COMPAT)
 107         default 65536
 108         help
 109           This is the portion of low virtual memory which should be protected
 110           from userspace allocation.  Keeping a user from writing to low pages
 111           can help reduce the impact of kernel NULL pointer bugs.
 112
 113           For most ia64, ppc64 and x86 users with lots of address space
 114           a value of 65536 is reasonable and should cause no problems.
 115           On arm and other archs it should not be higher than 32768.
 116           Programs which use vm86 functionality or have some need to map
 117           this low address space will need the permission specific to the
 118           systems running LSM.
 119
 120 source security/selinux/Kconfig
 121 source security/smack/Kconfig
 122 source security/tomoyo/Kconfig
 123 source security/apparmor/Kconfig
 124 source security/yama/Kconfig
 125
 126 source security/integrity/Kconfig
 127
 128 choice
 129         prompt "Default security module"
 130         default DEFAULT_SECURITY_SELINUX if SECURITY_SELINUX
 131         default DEFAULT_SECURITY_SMACK if SECURITY_SMACK
 132         default DEFAULT_SECURITY_TOMOYO if SECURITY_TOMOYO
 133         default DEFAULT_SECURITY_APPARMOR if SECURITY_APPARMOR
 134         default DEFAULT_SECURITY_YAMA if SECURITY_YAMA
 135         default DEFAULT_SECURITY_DAC
 136
 137         help
 138           Select the security module that will be used by default if the
 139           kernel parameter security= is not specified.
 140
 141         config DEFAULT_SECURITY_SELINUX
 142                 bool "SELinux" if SECURITY_SELINUX=y
 143
 144         config DEFAULT_SECURITY_SMACK
 145                 bool "Simplified Mandatory Access Control" if SECURITY_SMACK=y
 146
 147         config DEFAULT_SECURITY_TOMOYO
 148                 bool "TOMOYO" if SECURITY_TOMOYO=y
 149
 150         config DEFAULT_SECURITY_APPARMOR
 151                 bool "AppArmor" if SECURITY_APPARMOR=y
 152
 153         config DEFAULT_SECURITY_YAMA
 154                 bool "Yama" if SECURITY_YAMA=y
 155
 156         config DEFAULT_SECURITY_DAC
 157                 bool "Unix Discretionary Access Controls"
 158
 159 endchoice
 160
 161 config DEFAULT_SECURITY
 162         string
 163         default "selinux" if DEFAULT_SECURITY_SELINUX
 164         default "smack" if DEFAULT_SECURITY_SMACK
 165         default "tomoyo" if DEFAULT_SECURITY_TOMOYO
 166         default "apparmor" if DEFAULT_SECURITY_APPARMOR
 167         default "yama" if DEFAULT_SECURITY_YAMA
 168         default "" if DEFAULT_SECURITY_DAC
 169
 170 endmenu
 171