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integrity: check whether imputed trust is enabled

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trust_moklist() is specific to UEFI enabled systems. Other platforms
rely only on the Kconfig.

Define a generic wrapper named imputed_trust_enabled().

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
This commit is contained in:
Nayna Jain 2023-08-15 07:27:20 -04:00 committed by Jarkko Sakkinen
parent 7b9de40658
commit 4cb1ed94f1
4 changed files with 22 additions and 6 deletions
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2
security/integrity/digsig.c
View File

@ -113,7 +113,7 @@ static int __init __integrity_init_keyring(const unsigned int id,
} else {
if (id == INTEGRITY_KEYRING_PLATFORM)
set_platform_trusted_keys(keyring[id]);
if (id == INTEGRITY_KEYRING_MACHINE && trust_moklist())
if (id == INTEGRITY_KEYRING_MACHINE && imputed_trust_enabled())
set_machine_trusted_keys(keyring[id]);
if (id == INTEGRITY_KEYRING_IMA)
load_module_cert(keyring[id]);

5
security/integrity/integrity.h
View File

@ -320,13 +320,14 @@ static inline void __init add_to_platform_keyring(const char *source,
#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING
void __init add_to_machine_keyring(const char *source, const void *data, size_t len);
bool __init trust_moklist(void);
bool __init imputed_trust_enabled(void);
#else
static inline void __init add_to_machine_keyring(const char *source,
const void *data, size_t len)
{
}
static inline bool __init trust_moklist(void)
static inline bool __init imputed_trust_enabled(void)
{
return false;
}

3
security/integrity/platform_certs/keyring_handler.c
View File

@ -61,7 +61,8 @@ __init efi_element_handler_t get_handler_for_db(const efi_guid_t *sig_type)
__init efi_element_handler_t get_handler_for_mok(const efi_guid_t *sig_type)
{
if (efi_guidcmp(*sig_type, efi_cert_x509_guid) == 0) {
if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) && trust_moklist())
if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING) &&
imputed_trust_enabled())
return add_to_machine_keyring;
else
return add_to_platform_keyring;

18
security/integrity/platform_certs/machine_keyring.c
View File

@ -34,7 +34,8 @@ void __init add_to_machine_keyring(const char *source, const void *data, size_t
* If the restriction check does not pass and the platform keyring
* is configured, try to add it into that keyring instead.
*/
if (rc && efi_enabled(EFI_BOOT) && IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING))
if (rc && efi_enabled(EFI_BOOT) &&
IS_ENABLED(CONFIG_INTEGRITY_PLATFORM_KEYRING))
rc = integrity_load_cert(INTEGRITY_KEYRING_PLATFORM, source,
data, len, perm);
@ -60,7 +61,7 @@ static __init bool uefi_check_trust_mok_keys(void)
return false;
}
bool __init trust_moklist(void)
static bool __init trust_moklist(void)
{
static bool initialized;
static bool trust_mok;
@ -75,3 +76,16 @@ bool __init trust_moklist(void)
return trust_mok;
}
/*
* Provides platform specific check for trusting imputed keys before loading
* on .machine keyring. UEFI systems enable this trust based on a variable,
* and for other platforms, it is always enabled.
*/
bool __init imputed_trust_enabled(void)
{
if (efi_enabled(EFI_BOOT))
return trust_moklist();
return true;
}