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78 lines
2.3 KiB
78 lines
2.3 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2019 IBM Corporation |
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* Author: Nayna Jain |
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*/ |
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#include <linux/ima.h> |
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#include <asm/secure_boot.h> |
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bool arch_ima_get_secureboot(void) |
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{ |
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return is_ppc_secureboot_enabled(); |
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} |
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/* |
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* The "secure_rules" are enabled only on "secureboot" enabled systems. |
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* These rules verify the file signatures against known good values. |
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* The "appraise_type=imasig|modsig" option allows the known good signature |
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* to be stored as an xattr or as an appended signature. |
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* |
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* To avoid duplicate signature verification as much as possible, the IMA |
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* policy rule for module appraisal is added only if CONFIG_MODULE_SIG |
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* is not enabled. |
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*/ |
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static const char *const secure_rules[] = { |
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"appraise func=KEXEC_KERNEL_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", |
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#ifndef CONFIG_MODULE_SIG |
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"appraise func=MODULE_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", |
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#endif |
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NULL |
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}; |
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/* |
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* The "trusted_rules" are enabled only on "trustedboot" enabled systems. |
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* These rules add the kexec kernel image and kernel modules file hashes to |
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* the IMA measurement list. |
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*/ |
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static const char *const trusted_rules[] = { |
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"measure func=KEXEC_KERNEL_CHECK", |
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"measure func=MODULE_CHECK", |
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NULL |
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}; |
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/* |
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* The "secure_and_trusted_rules" contains rules for both the secure boot and |
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* trusted boot. The "template=ima-modsig" option includes the appended |
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* signature, when available, in the IMA measurement list. |
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*/ |
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static const char *const secure_and_trusted_rules[] = { |
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"measure func=KEXEC_KERNEL_CHECK template=ima-modsig", |
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"measure func=MODULE_CHECK template=ima-modsig", |
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"appraise func=KEXEC_KERNEL_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", |
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#ifndef CONFIG_MODULE_SIG |
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"appraise func=MODULE_CHECK appraise_flag=check_blacklist appraise_type=imasig|modsig", |
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#endif |
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NULL |
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}; |
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/* |
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* Returns the relevant IMA arch-specific policies based on the system secure |
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* boot state. |
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*/ |
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const char *const *arch_get_ima_policy(void) |
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{ |
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if (is_ppc_secureboot_enabled()) { |
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if (IS_ENABLED(CONFIG_MODULE_SIG)) |
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set_module_sig_enforced(); |
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if (is_ppc_trustedboot_enabled()) |
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return secure_and_trusted_rules; |
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else |
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return secure_rules; |
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} else if (is_ppc_trustedboot_enabled()) { |
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return trusted_rules; |
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} |
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return NULL; |
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}
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