efibootmgr: add support for listing cryptographic signature types. #200
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Since UEFI 2.2, firmware has provided a list of supported signature
types for Secure Boot binaries in a global variable named
"SignatureSupport".
This patch adds a new command line flag to efibootmgr,
"--list-signature-types" ("-s") which collects that information from the
firmware and displays it to the user, either by symbolic name if
libefivar knows about that signature type or by GUID if it does not.
On the system in front of me, that looks something like this:
random:efibootmgr/signaturesupport$ ./src/efibootmgr -s
x509_sha256
x509_sha384
x509_sha512
sha256
x509_cert
rsa2048
rsa2048_sha256
rsa2048_sha1
external_management
random:efibootmgr/signaturesupport$ ./src/efibootmgr -s -v
x509_sha256 3bd2a492-96c0-4079-b420-fcf98ef103ed
x509_sha384 7076876e-80c2-4ee6-aad2-28b349a6865b
x509_sha512 446dbf63-2502-4cda-bcfa-2465d2b0fe9d
sha256 c1c41626-504c-4092-aca9-41f936934328
x509_cert a5c059a1-94e4-4aa7-87b5-ab155c2bf072
rsa2048 3c5766e8-269c-4e34-aa14-ed776e85b3b6
rsa2048_sha256 e2b36190-879b-4a3d-ad8d-f2e7bba32784
rsa2048_sha1 67f8444f-8743-48f1-a328-1eaab8736080
external_management 452e8ced-dfff-4b8c-ae01-5118862e682c
random:efibootmgr/signaturesupport$
Signed-off-by: Peter Jones <[email protected]>
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Since UEFI 2.2, firmware has provided a list of supported signature types for Secure Boot binaries in a global variable named "SignatureSupport".
This patch adds a new command line flag to efibootmgr, "--list-signature-types" ("-s") which collects that information from the firmware and displays it to the user, either by symbolic name if libefivar knows about that signature type or by GUID if it does not.
On the system in front of me, that looks something like this:
random:efibootmgr/signaturesupport$ ./src/efibootmgr -s x509_sha256
x509_sha384
x509_sha512
sha256
x509_cert
rsa2048
rsa2048_sha256
rsa2048_sha1
external_management
random:efibootmgr/signaturesupport$