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IMA: add support to restrict the hash algorithms used for file appraisal

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The kernel accepts any hash algorithm as a value for the security.ima
xattr. Users may wish to restrict the accepted algorithms to only
support strong cryptographic ones.

Provide the plumbing to restrict the permitted set of hash algorithms
used for verifying file hashes and signatures stored in security.ima
xattr.

Signed-off-by: THOBY Simon <Simon.THOBY@viveris.fr>
Reviewed-by: Lakshmi Ramasubramanian <nramas@linux.microsoft.com>
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
This commit is contained in:
THOBY Simon
2021-08-16 08:11:00 +00:00
committed by Mimi Zohar
parent 50f742dd91
commit 1624dc0086
5 changed files with 41 additions and 12 deletions
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5
security/integrity/ima/ima_appraise.c
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@@ -77,8 +77,9 @@ int ima_must_appraise(struct user_namespace *mnt_userns, struct inode *inode,
return 0;
security_task_getsecid_subj(current, &secid);
return ima_match_policy(mnt_userns, inode, current_cred(), secid, func,
mask, IMA_APPRAISE | IMA_HASH, NULL, NULL, NULL);
return ima_match_policy(mnt_userns, inode, current_cred(), secid,
func, mask, IMA_APPRAISE | IMA_HASH, NULL,
NULL, NULL, NULL);
}
static int ima_fix_xattr(struct dentry *dentry,