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| author | Eric Snowberg <eric.snowberg@oracle.com> | 2023-03-02 11:46:52 -0500 |
|---|---|---|
| committer | Jarkko Sakkinen <jarkko@kernel.org> | 2023-04-24 16:15:53 +0300 |
| commit | 099f26f22f5834ad744aee093ed4d11de13cac15 (patch) | |
| tree | 78982465b1d36b2d58b97e03b4888a3d84d22032 /security/integrity/digsig.c | |
| parent | 76adb2fbc69a13c80b39042aab4d34e99309c8d4 (diff) | |
| download | linux-099f26f22f5834ad744aee093ed4d11de13cac15.tar.gz | |
integrity: machine keyring CA configuration
Add machine keyring CA restriction options to control the type of
keys that may be added to it. The motivation is separation of
certificate signing from code signing keys. Subsquent work will
limit certificates being loaded into the IMA keyring to code
signing keys used for signature verification.
When no restrictions are selected, all Machine Owner Keys (MOK) are added
to the machine keyring. When CONFIG_INTEGRITY_CA_MACHINE_KEYRING is
selected, the CA bit must be true. Also the key usage must contain
keyCertSign, any other usage field may be set as well.
When CONFIG_INTEGRITY_CA_MACHINE_KEYRING_MAX is selected, the CA bit must
be true. Also the key usage must contain keyCertSign and the
digitialSignature usage may not be set.
Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com>
Acked-by: Mimi Zohar <zohar@linux.ibm.com>
Reviewed-by: Jarkko Sakkinen <jarkko@kernel.org>
Tested-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Jarkko Sakkinen <jarkko@kernel.org>
Diffstat (limited to 'security/integrity/digsig.c')
| -rw-r--r-- | security/integrity/digsig.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index f2193c531f4a..6f31ffe23c48 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -132,7 +132,8 @@ int __init integrity_init_keyring(const unsigned int id) | KEY_USR_READ | KEY_USR_SEARCH; if (id == INTEGRITY_KEYRING_PLATFORM || - id == INTEGRITY_KEYRING_MACHINE) { + (id == INTEGRITY_KEYRING_MACHINE && + !IS_ENABLED(CONFIG_INTEGRITY_CA_MACHINE_KEYRING))) { restriction = NULL; goto out; } @@ -144,7 +145,10 @@ int __init integrity_init_keyring(const unsigned int id) if (!restriction) return -ENOMEM; - restriction->check = restrict_link_to_ima; + if (id == INTEGRITY_KEYRING_MACHINE) + restriction->check = restrict_link_by_ca; + else + restriction->check = restrict_link_to_ima; /* * MOK keys can only be added through a read-only runtime services |