[PATCH] integrity: support new struct public_key_signature encoding field

[PATCH] integrity: support new struct public_key_signature encoding field

[Mimi Zohar]

On systems with IMA-appraisal enabled with a policy requiring file
signatures, the "good" signature values are stored on the filesystem as
extended attributes (security.ima).  Signature verification failure
would normally be limited to just a particular file (eg. executable),
but during boot signature verification failure could result in a system
hang.

Defining and requiring a new public_key_signature field requires all
callers of asymmetric signature verification to be updated to reflect
the change.  This patch updates the integrity asymmetric_verify()
caller.

Fixes: 82f94f24475c ("KEYS: Provide software public key query function [ver #2]")
Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
Cc: David Howells <dhowells@redhat.com>
Cc: Denis Kenzior <denkenz@gmail.com>
---
 security/integrity/digsig_asymmetric.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
index 6dc075144508..d775e03fbbcc 100644
--- a/security/integrity/digsig_asymmetric.c
+++ b/security/integrity/digsig_asymmetric.c
@@ -106,6 +106,7 @@ int asymmetric_verify(struct key *keyring, const char *sig,
 
 	pks.pkey_algo = "rsa";
 	pks.hash_algo = hash_algo_name[hdr->hash_algo];
+	pks.encoding = "pkcs1";
 	pks.digest = (u8 *)data;
 	pks.digest_size = datalen;
 	pks.s = hdr->sig;
-- 
2.7.5

Re: [PATCH] integrity: support new struct public_key_signature encoding field

[Denis Kenzior]

Hi Mimi,

On 11/11/2018 08:29 AM, Mimi Zohar wrote:
> On systems with IMA-appraisal enabled with a policy requiring file
> signatures, the "good" signature values are stored on the filesystem as
> extended attributes (security.ima).  Signature verification failure
> would normally be limited to just a particular file (eg. executable),
> but during boot signature verification failure could result in a system
> hang.
> 
> Defining and requiring a new public_key_signature field requires all
> callers of asymmetric signature verification to be updated to reflect
> the change.  This patch updates the integrity asymmetric_verify()
> caller.
> 
> Fixes: 82f94f24475c ("KEYS: Provide software public key query function [ver #2]")
> Signed-off-by: Mimi Zohar <zohar@linux.ibm.com>
> Cc: David Howells <dhowells@redhat.com>
> Cc: Denis Kenzior <denkenz@gmail.com>
> ---
>   security/integrity/digsig_asymmetric.c | 1 +
>   1 file changed, 1 insertion(+)
> 

Acked/Reviewed by: Denis Kenzior <denkenz@gmail.com>

Regards,
-Denis