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2012-09-06 12:13:44 -04:00
Cryptlib Remove temp file checked in by accident 2012-07-09 10:38:30 -04:00
cert.S Allow specification of vendor_cert through a build command line option. 2012-09-06 12:13:44 -04:00
COPYRIGHT Add copyright file 2012-07-09 11:03:12 -04:00
Makefile Allow specification of vendor_cert through a build command line option. 2012-09-06 12:13:44 -04:00
PeImage.h dos2unix PeImage.h 2012-09-06 12:01:43 -04:00
README Add basic documentation 2012-07-28 00:42:43 -04:00
shim.c Use the file size, not the image size field, for verification. 2012-09-06 12:13:44 -04:00
shim.h We're not MSABI, so don't advertise this as such 2012-07-05 12:52:42 -04:00
signature.h Add black/white listing 2012-06-25 10:59:08 -04:00
TODO Update TODO 2012-07-09 10:39:14 -04:00

shim is a trivial EFI application that, when run, attempts to open and
execute another application. It will initially attempt to do this via the
standard EFI LoadImage() and StartImage() calls. If these fail (because secure
boot is enabled and the binary is not signed with an appropriate key, for
instance) it will then validate the binary against a built-in certificate. If
this succeeds and if the binary or signing key are not blacklisted then shim
will relocate and execute the binary.

shim will also install a protocol which permits the second-stage bootloader
to perform similar binary validation. This protocol has a GUID as described
in the shim.h header file and provides a single entry point. On 64-bit systems
this entry point expects to be called with SysV ABI rather than MSABI, and
so calls to it should not be wrapped.

To use shim, simply place a hex dump of the public certificate in cert.h
and build it with make.