kernel/linux.git/security/integrity/Kconfig, branch v5.0.15

Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security

2019-01-02T17:43:14+00:00

Pull integrity updates from James Morris: "In Linux 4.19, a new LSM hook named security_kernel_load_data was upstreamed, allowing LSMs and IMA to prevent the kexec_load syscall. Different signature verification methods exist for verifying the kexec'ed kernel image. This adds additional support in IMA to prevent loading unsigned kernel images via the kexec_load syscall, independently of the IMA policy rules, based on the runtime "secure boot" flag. An initial IMA kselftest is included. In addition, this pull request defines a new, separate keyring named ".platform" for storing the preboot/firmware keys needed for verifying the kexec'ed kernel image's signature and includes the associated IMA kexec usage of the ".platform" keyring. (David Howell's and Josh Boyer's patches for reading the preboot/firmware keys, which were previously posted for a different use case scenario, are included here)" * 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security: integrity: Remove references to module keyring ima: Use inode_is_open_for_write ima: Support platform keyring for kernel appraisal efi: Allow the "db" UEFI variable to be suppressed efi: Import certificates from UEFI Secure Boot efi: Add an EFI signature blob parser efi: Add EFI signature data types integrity: Load certs to the platform keyring integrity: Define a trusted platform keyring selftests/ima: kexec_load syscall test ima: don't measure/appraise files on efivarfs x86/ima: retry detecting secure boot mode docs: Extend trusted keys documentation for TPM 2.0 x86/ima: define arch_get_ima_policy() for x86 ima: add support for arch specific policies ima: refactor ima_init_policy() ima: prevent kexec_load syscall based on runtime secureboot flag x86/ima: define arch_ima_get_secureboot integrity: support new struct public_key_signature encoding field

treewide: surround Kconfig file paths with double quotes

2018-12-21T15:25:54+00:00

The Kconfig lexer supports special characters such as '.' and '/' in the parameter context. In my understanding, the reason is just to support bare file paths in the source statement. I do not see a good reason to complicate Kconfig for the room of ambiguity. The majority of code already surrounds file paths with double quotes, and it makes sense since file paths are constant string literals. Make it treewide consistent now. Signed-off-by: Masahiro Yamada Acked-by: Wolfram Sang Acked-by: Geert Uytterhoeven Acked-by: Ingo Molnar

integrity: Define a trusted platform keyring

2018-12-13T03:02:28+00:00

On secure boot enabled systems, a verified kernel may need to kexec additional kernels. For example, it may be used as a bootloader needing to kexec a target kernel or it may need to kexec a crashdump kernel. In such cases, it may want to verify the signature of the next kernel image. It is further possible that the kernel image is signed with third party keys which are stored as platform or firmware keys in the 'db' variable. The kernel, however, can not directly verify these platform keys, and an administrator may therefore not want to trust them for arbitrary usage. In order to differentiate platform keys from other keys and provide the necessary separation of trust, the kernel needs an additional keyring to store platform keys. This patch creates the new keyring called ".platform" to isolate keys provided by platform from keys by kernel. These keys are used to facilitate signature verification during kexec. Since the scope of this keyring is only the platform/firmware keys, it cannot be updated from userspace. This keyring can be enabled by setting CONFIG_INTEGRITY_PLATFORM_KEYRING. Signed-off-by: Nayna Jain Reviewed-by: Mimi Zohar Acked-by: Serge Hallyn Reviewed-by: James Morris Reviewed-by: Thiago Jung Bauermann Signed-off-by: Mimi Zohar

security: integrity: Remove select to deleted option PUBLIC_KEY_ALGO_RSA

2016-04-12T18:54:58+00:00

Commit d43de6c780a8 ("akcipher: Move the RSA DER encoding check to the crypto layer") removed the Kconfig option PUBLIC_KEY_ALGO_RSA, but forgot to remove a 'select' to this option in the definition of INTEGRITY_ASYMMETRIC_KEYS. Let's remove the select, as it's ineffective now. Signed-off-by: Andreas Ziegler Signed-off-by: David Howells

integrity: convert digsig to akcipher api

2016-02-18T14:52:32+00:00

Convert asymmetric_verify to akcipher api. Signed-off-by: Tadeusz Struk Acked-by: Herbert Xu Signed-off-by: David Howells

KEYS: CONFIG_KEYS_DEBUG_PROC_KEYS is no longer an option

2016-02-10T10:13:27+00:00

CONFIG_KEYS_DEBUG_PROC_KEYS is no longer an option as /proc/keys is now mandatory if the keyrings facility is enabled (it's used by libkeyutils in userspace). The defconfig references were removed with: perl -p -i -e 's/CONFIG_KEYS_DEBUG_PROC_KEYS=y\n//' \ `git grep -l CONFIG_KEYS_DEBUG_PROC_KEYS=y` and the integrity Kconfig fixed by hand. Signed-off-by: David Howells cc: Andreas Ziegler cc: Dmitry Kasatkin

integrity: define '.evm' as a builtin 'trusted' keyring

2015-11-23T19:30:02+00:00

Require all keys added to the EVM keyring be signed by an existing trusted key on the system trusted keyring. This patch also switches IMA to use integrity_init_keyring(). Changes in v3: * Added 'init_keyring' config based variable to skip initializing keyring instead of using __integrity_init_keyring() wrapper. * Added dependency back to CONFIG_IMA_TRUSTED_KEYRING Changes in v2: * Replace CONFIG_EVM_TRUSTED_KEYRING with IMA and EVM common CONFIG_INTEGRITY_TRUSTED_KEYRING configuration option * Deprecate CONFIG_IMA_TRUSTED_KEYRING but keep it for config file compatibility. (Mimi Zohar) Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar

kconfig: use bool instead of boolean for type definition attributes

2015-01-07T12:08:04+00:00

Support for keyword 'boolean' will be dropped later on. No functional change. Reference: http://lkml.kernel.org/r/cover.1418003065.git.cj@linux.com Signed-off-by: Christoph Jaeger Signed-off-by: Michal Marek

integrity: base integrity subsystem kconfig options on integrity

2014-09-09T14:28:56+00:00

The integrity subsystem has lots of options and takes more than half of the security menu. This patch consolidates the options under "integrity", which are hidden if not enabled. This change does not affect existing configurations. Re-configuration is not needed. Changes v4: - no need to change "integrity subsystem" to menuconfig as options are hidden, when not enabled. (Mimi) - add INTEGRITY Kconfig help description Changes v3: - dependency to INTEGRITY removed when behind 'if INTEGRITY' Changes v2: - previous patch moved integrity out of the 'security' menu. This version keeps integrity as a security option (Mimi). Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar

integrity: move asymmetric keys config option

2014-09-09T14:28:55+00:00

For better visual appearance it is better to co-locate asymmetric key options together with signature support. Signed-off-by: Dmitry Kasatkin Signed-off-by: Mimi Zohar