diff options
| author | Matthew Garrett <mjg59@google.com> | 2017-11-07 07:17:42 -0800 |
|---|---|---|
| committer | Mimi Zohar <zohar@linux.vnet.ibm.com> | 2017-12-11 17:20:39 -0500 |
| commit | 50b977481fce90aa5fbda55e330b9d722733e358 (patch) | |
| tree | f7852b45d6d4207e37cd89c397905e1a7558c527 /security/integrity/integrity.h | |
| parent | ae1ba1676b88e6c62368a433c7e2d0417e9879fd (diff) | |
EVM: Add support for portable signature format
The EVM signature includes the inode number and (optionally) the
filesystem UUID, making it impractical to ship EVM signatures in
packages. This patch adds a new portable format intended to allow
distributions to include EVM signatures. It is identical to the existing
format but hardcodes the inode and generation numbers to 0 and does not
include the filesystem UUID even if the kernel is configured to do so.
Removing the inode means that the metadata and signature from one file
could be copied to another file without invalidating it. This is avoided
by ensuring that an IMA xattr is present during EVM validation.
Portable signatures are intended to be immutable - ie, they will never
be transformed into HMACs.
Based on earlier work by Dmitry Kasatkin and Mikhail Kurinnoi.
Signed-off-by: Matthew Garrett <mjg59@google.com>
Cc: Dmitry Kasatkin <dmitry.kasatkin@huawei.com>
Cc: Mikhail Kurinnoi <viewizard@viewizard.com>
Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity/integrity.h')
| -rw-r--r-- | security/integrity/integrity.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index e1bf040fb110..e324bf98c856 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -33,6 +33,7 @@ #define IMA_DIGSIG_REQUIRED 0x02000000 #define IMA_PERMIT_DIRECTIO 0x04000000 #define IMA_NEW_FILE 0x08000000 +#define EVM_IMMUTABLE_DIGSIG 0x10000000 #define IMA_DO_MASK (IMA_MEASURE | IMA_APPRAISE | IMA_AUDIT | \ IMA_APPRAISE_SUBMASK) @@ -58,6 +59,7 @@ enum evm_ima_xattr_type { EVM_XATTR_HMAC, EVM_IMA_XATTR_DIGSIG, IMA_XATTR_DIGEST_NG, + EVM_XATTR_PORTABLE_DIGSIG, IMA_XATTR_LAST }; |