[PATCH v7 12/17] KEYS: integrity: change link restriction to trust the machine keyring
From: Eric Snowberg <eric.snowberg@oracle.com>
Date: 2021-11-16 00:20:15
Also in:
keyrings, linux-efi, linux-integrity, linux-security-module, lkml
Subsystem:
certificate handling, extended verification module (evm), integrity measurement architecture (ima), security subsystem, the rest · Maintainers:
David Howells, David Woodhouse, Mimi Zohar, Roberto Sassu, Dmitry Kasatkin, Paul Moore, James Morris, "Serge E. Hallyn", Linus Torvalds
With the introduction of the machine keyring, the end-user may choose to trust Machine Owner Keys (MOK) within the kernel. If they have chosen to trust them, the .machine keyring will contain these keys. If not, the machine keyring will always be empty. Update the restriction check to allow the secondary trusted keyring and ima keyring to also trust machine keys. Signed-off-by: Eric Snowberg <eric.snowberg@oracle.com> --- v4: Initial version (consolidated two previous patches) v5: Rename to machine keyring v6: Account for restriction being renamed earlier v7: Unmodified from v6 --- certs/system_keyring.c | 5 ++++- security/integrity/digsig.c | 4 ++++ 2 files changed, 8 insertions(+), 1 deletion(-)
diff --git a/certs/system_keyring.c b/certs/system_keyring.c
index 71a00add9805..ba732856ebd0 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c@@ -89,7 +89,10 @@ static __init struct key_restriction *get_secondary_restriction(void) if (!restriction) panic("Can't allocate secondary trusted keyring restriction\n"); - restriction->check = restrict_link_by_builtin_and_secondary_trusted; + if (IS_ENABLED(CONFIG_INTEGRITY_MACHINE_KEYRING)) + restriction->check = restrict_link_by_builtin_secondary_and_machine; + else + restriction->check = restrict_link_by_builtin_and_secondary_trusted; return restriction; }
diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index e7dfc55a7c55..74f73f7cc4fe 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c@@ -34,7 +34,11 @@ static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = { }; #ifdef CONFIG_IMA_KEYRINGS_PERMIT_SIGNED_BY_BUILTIN_OR_SECONDARY +#ifdef CONFIG_INTEGRITY_MACHINE_KEYRING +#define restrict_link_to_ima restrict_link_by_builtin_secondary_and_machine +#else #define restrict_link_to_ima restrict_link_by_builtin_and_secondary_trusted +#endif #else #define restrict_link_to_ima restrict_link_by_builtin_trusted #endif
--
2.18.4