efi_loader: signature: rework for intermediate certificates support

In this commit, efi_signature_verify(with_sigdb) will be re-implemented
using pcks7_verify_one() in order to support certificates chain, where
the signer's certificate will be signed by an intermediate CA (certificate
authority) and the latter's certificate will also be signed by another CA
and so on.

What we need to do here is to search for certificates in a signature,
build up a chain of certificates and verify one by one. pkcs7_verify_one()
handles most of these steps except the last one.

pkcs7_verify_one() returns, if succeeded, the last certificate to verify,
which can be either a self-signed one or one that should be signed by one
of certificates in "db". Re-worked efi_signature_verify() will take care
of this step.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/efi_loader.h b/include/efi_loader.h
index 7f0ab1b..b941b5e 100644
--- a/include/efi_loader.h
+++ b/include/efi_loader.h
@@ -776,10 +776,10 @@ bool efi_signature_lookup_digest(struct efi_image_regions *regs,
 bool efi_signature_verify_one(struct efi_image_regions *regs,
 			      struct pkcs7_message *msg,
 			      struct efi_signature_store *db);
-bool efi_signature_verify_with_sigdb(struct efi_image_regions *regs,
-				     struct pkcs7_message *msg,
-				     struct efi_signature_store *db,
-				     struct efi_signature_store *dbx);
+bool efi_signature_verify(struct efi_image_regions *regs,
+			  struct pkcs7_message *msg,
+			  struct efi_signature_store *db,
+			  struct efi_signature_store *dbx);
 bool efi_signature_check_signers(struct pkcs7_message *msg,
 				 struct efi_signature_store *dbx);