diff options
| -rw-r--r-- | include/keys/system_keyring.h | 13 | ||||
| -rw-r--r-- | security/integrity/digsig.c | 30 | ||||
| -rw-r--r-- | security/integrity/ima/Kconfig | 36 | ||||
| -rw-r--r-- | security/integrity/ima/Makefile | 2 | ||||
| -rw-r--r-- | security/integrity/ima/ima_mok.c | 17 |
5 files changed, 34 insertions, 64 deletions
diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h index 614424029de7..fbd4647767e9 100644 --- a/include/keys/system_keyring.h +++ b/include/keys/system_keyring.h @@ -33,28 +33,19 @@ extern int restrict_link_by_builtin_and_secondary_trusted( #define restrict_link_by_builtin_and_secondary_trusted restrict_link_by_builtin_trusted #endif -#ifdef CONFIG_IMA_MOK_KEYRING -extern struct key *ima_mok_keyring; +#ifdef CONFIG_IMA_BLACKLIST_KEYRING extern struct key *ima_blacklist_keyring; -static inline struct key *get_ima_mok_keyring(void) -{ - return ima_mok_keyring; -} static inline struct key *get_ima_blacklist_keyring(void) { return ima_blacklist_keyring; } #else -static inline struct key *get_ima_mok_keyring(void) -{ - return NULL; -} static inline struct key *get_ima_blacklist_keyring(void) { return NULL; } -#endif /* CONFIG_IMA_MOK_KEYRING */ +#endif /* CONFIG_IMA_BLACKLIST_KEYRING */ #endif /* _KEYS_SYSTEM_KEYRING_H */ diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 98ee4c752cf5..4304372b323f 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -42,32 +42,10 @@ static bool init_keyring __initdata = true; static bool init_keyring __initdata; #endif -#ifdef CONFIG_SYSTEM_TRUSTED_KEYRING -/* - * Restrict the addition of keys into the IMA keyring. - * - * Any key that needs to go in .ima keyring must be signed by CA in - * either .system or .ima_mok keyrings. - */ -static int restrict_link_by_ima_mok(struct key *keyring, - const struct key_type *type, - const union key_payload *payload) -{ - int ret; - - ret = restrict_link_by_builtin_trusted(keyring, type, payload); - if (ret != -ENOKEY) - return ret; - - return restrict_link_by_signature(get_ima_mok_keyring(), - type, payload); -} +#ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY +#define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted #else -/* - * If there's no system trusted keyring, then keys cannot be loaded into - * .ima_mok and added keys cannot be marked trusted. - */ -#define restrict_link_by_ima_mok restrict_link_reject +#define restrict_link_to_ima restrict_link_by_builtin_trusted #endif int integrity_digsig_verify(const unsigned int id, const char *sig, int siglen, @@ -114,7 +92,7 @@ int __init integrity_init_keyring(const unsigned int id) KEY_USR_VIEW | KEY_USR_READ | KEY_USR_WRITE | KEY_USR_SEARCH), KEY_ALLOC_NOT_IN_QUOTA, - restrict_link_by_ima_mok, NULL); + restrict_link_to_ima, NULL); if (IS_ERR(keyring[id])) { err = PTR_ERR(keyring[id]); pr_info("Can't allocate %s keyring (%d)\n", diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig index e54a8a8dae94..5487827fa86c 100644 --- a/security/integrity/ima/Kconfig +++ b/security/integrity/ima/Kconfig @@ -155,23 +155,33 @@ config IMA_TRUSTED_KEYRING This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING -config IMA_MOK_KEYRING - bool "Create IMA machine owner keys (MOK) and blacklist keyrings" +config IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY + bool "Permit keys validly signed by a built-in or secondary CA cert (EXPERIMENTAL)" + depends on SYSTEM_TRUSTED_KEYRING + depends on SECONDARY_TRUSTED_KEYRING + depends on INTEGRITY_ASYMMETRIC_KEYS + select INTEGRITY_TRUSTED_KEYRING + default n + help + Keys may be added to the IMA or IMA blacklist keyrings, if the + key is validly signed by a CA cert in the system built-in or + secondary trusted keyrings. + + Intermediate keys between those the kernel has compiled in and the + IMA keys to be added may be added to the system secondary keyring, + provided they are validly signed by a key already resident in the + built-in or secondary trusted keyrings. + +config IMA_BLACKLIST_KEYRING + bool "Create IMA machine owner blacklist keyrings (EXPERIMENTAL)" depends on SYSTEM_TRUSTED_KEYRING depends on IMA_TRUSTED_KEYRING default n help - This option creates IMA MOK and blacklist keyrings. IMA MOK is an - intermediate keyring that sits between .system and .ima keyrings, - effectively forming a simple CA hierarchy. To successfully import a - key into .ima_mok it must be signed by a key which CA is in .system - keyring. On turn any key that needs to go in .ima keyring must be - signed by CA in either .system or .ima_mok keyrings. IMA MOK is empty - at kernel boot. - - IMA blacklist keyring contains all revoked IMA keys. It is consulted - before any other keyring. If the search is successful the requested - operation is rejected and error is returned to the caller. + This option creates an IMA blacklist keyring, which contains all + revoked IMA keys. It is consulted before any other keyring. If + the search is successful the requested operation is rejected and + an error is returned to the caller. config IMA_LOAD_X509 bool "Load X509 certificate onto the '.ima' trusted keyring" diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile index a8539f9e060f..9aeaedad1e2b 100644 --- a/security/integrity/ima/Makefile +++ b/security/integrity/ima/Makefile @@ -8,4 +8,4 @@ obj-$(CONFIG_IMA) += ima.o ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \ ima_policy.o ima_template.o ima_template_lib.o ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o -obj-$(CONFIG_IMA_MOK_KEYRING) += ima_mok.o +obj-$(CONFIG_IMA_BLACKLIST_KEYRING) += ima_mok.o diff --git a/security/integrity/ima/ima_mok.c b/security/integrity/ima/ima_mok.c index 2988726d30d6..74a279957464 100644 --- a/security/integrity/ima/ima_mok.c +++ b/security/integrity/ima/ima_mok.c @@ -20,23 +20,14 @@ #include <keys/system_keyring.h> -struct key *ima_mok_keyring; struct key *ima_blacklist_keyring; /* - * Allocate the IMA MOK and blacklist keyrings + * Allocate the IMA blacklist keyring */ __init int ima_mok_init(void) { - pr_notice("Allocating IMA MOK and blacklist keyrings.\n"); - - ima_mok_keyring = keyring_alloc(".ima_mok", - KUIDT_INIT(0), KGIDT_INIT(0), current_cred(), - (KEY_POS_ALL & ~KEY_POS_SETATTR) | - KEY_USR_VIEW | KEY_USR_READ | - KEY_USR_WRITE | KEY_USR_SEARCH, - KEY_ALLOC_NOT_IN_QUOTA, - restrict_link_by_builtin_trusted, NULL); + pr_notice("Allocating IMA blacklist keyring.\n"); ima_blacklist_keyring = keyring_alloc(".ima_blacklist", KUIDT_INIT(0), KGIDT_INIT(0), current_cred(), @@ -46,8 +37,8 @@ __init int ima_mok_init(void) KEY_ALLOC_NOT_IN_QUOTA, restrict_link_by_builtin_trusted, NULL); - if (IS_ERR(ima_mok_keyring) || IS_ERR(ima_blacklist_keyring)) - panic("Can't allocate IMA MOK or blacklist keyrings."); + if (IS_ERR(ima_blacklist_keyring)) + panic("Can't allocate IMA blacklist keyring."); set_bit(KEY_FLAG_KEEP, &ima_blacklist_keyring->flags); return 0; |