14238fad3SNayna Jain // SPDX-License-Identifier: GPL-2.0
24238fad3SNayna Jain /*
34238fad3SNayna Jain * Copyright (C) 2019 IBM Corporation
44238fad3SNayna Jain * Author: Nayna Jain
54238fad3SNayna Jain */
64238fad3SNayna Jain
74238fad3SNayna Jain #include <linux/ima.h>
84238fad3SNayna Jain #include <asm/secure_boot.h>
94238fad3SNayna Jain
arch_ima_get_secureboot(void)104238fad3SNayna Jain bool arch_ima_get_secureboot(void)
114238fad3SNayna Jain {
124238fad3SNayna Jain return is_ppc_secureboot_enabled();
134238fad3SNayna Jain }
144238fad3SNayna Jain
154238fad3SNayna Jain /*
164238fad3SNayna Jain * The "secure_rules" are enabled only on "secureboot" enabled systems.
174238fad3SNayna Jain * These rules verify the file signatures against known good values.
184238fad3SNayna Jain * The "appraise_type=imasig|modsig" option allows the known good signature
194238fad3SNayna Jain * to be stored as an xattr or as an appended signature.
204238fad3SNayna Jain *
214238fad3SNayna Jain * To avoid duplicate signature verification as much as possible, the IMA
22fa4f3f56SNayna Jain * policy rule for module appraisal is added only if CONFIG_MODULE_SIG
234238fad3SNayna Jain * is not enabled.
244238fad3SNayna Jain */
254238fad3SNayna Jain static const char *const secure_rules[] = {
26*f20765fdSEric Snowberg "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig|modsig",
27fa4f3f56SNayna Jain #ifndef CONFIG_MODULE_SIG
28*f20765fdSEric Snowberg "appraise func=MODULE_CHECK appraise_type=imasig|modsig",
294238fad3SNayna Jain #endif
304238fad3SNayna Jain NULL
314238fad3SNayna Jain };
324238fad3SNayna Jain
334238fad3SNayna Jain /*
341917855fSNayna Jain * The "trusted_rules" are enabled only on "trustedboot" enabled systems.
351917855fSNayna Jain * These rules add the kexec kernel image and kernel modules file hashes to
361917855fSNayna Jain * the IMA measurement list.
371917855fSNayna Jain */
381917855fSNayna Jain static const char *const trusted_rules[] = {
391917855fSNayna Jain "measure func=KEXEC_KERNEL_CHECK",
401917855fSNayna Jain "measure func=MODULE_CHECK",
411917855fSNayna Jain NULL
421917855fSNayna Jain };
431917855fSNayna Jain
441917855fSNayna Jain /*
451917855fSNayna Jain * The "secure_and_trusted_rules" contains rules for both the secure boot and
461917855fSNayna Jain * trusted boot. The "template=ima-modsig" option includes the appended
471917855fSNayna Jain * signature, when available, in the IMA measurement list.
481917855fSNayna Jain */
491917855fSNayna Jain static const char *const secure_and_trusted_rules[] = {
501917855fSNayna Jain "measure func=KEXEC_KERNEL_CHECK template=ima-modsig",
511917855fSNayna Jain "measure func=MODULE_CHECK template=ima-modsig",
52*f20765fdSEric Snowberg "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig|modsig",
53fa4f3f56SNayna Jain #ifndef CONFIG_MODULE_SIG
54*f20765fdSEric Snowberg "appraise func=MODULE_CHECK appraise_type=imasig|modsig",
551917855fSNayna Jain #endif
561917855fSNayna Jain NULL
571917855fSNayna Jain };
581917855fSNayna Jain
591917855fSNayna Jain /*
604238fad3SNayna Jain * Returns the relevant IMA arch-specific policies based on the system secure
614238fad3SNayna Jain * boot state.
624238fad3SNayna Jain */
arch_get_ima_policy(void)634238fad3SNayna Jain const char *const *arch_get_ima_policy(void)
644238fad3SNayna Jain {
65d72ea491SMimi Zohar if (is_ppc_secureboot_enabled()) {
66d72ea491SMimi Zohar if (IS_ENABLED(CONFIG_MODULE_SIG))
67d72ea491SMimi Zohar set_module_sig_enforced();
68d72ea491SMimi Zohar
691917855fSNayna Jain if (is_ppc_trustedboot_enabled())
701917855fSNayna Jain return secure_and_trusted_rules;
711917855fSNayna Jain else
724238fad3SNayna Jain return secure_rules;
73d72ea491SMimi Zohar } else if (is_ppc_trustedboot_enabled()) {
741917855fSNayna Jain return trusted_rules;
75d72ea491SMimi Zohar }
764238fad3SNayna Jain
774238fad3SNayna Jain return NULL;
784238fad3SNayna Jain }
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