UEFI shim loader
C C++ Other
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Cryptlib
include
lib
.gitignore
COPYRIGHT
Makefile
MokManager.c
MokVars.txt
PasswordCrypt.c
PasswordCrypt.h
README
TODO
cert.S
crypt_blowfish.c
crypt_blowfish.h
elf_aarch64_efi.lds
elf_arm_efi.lds
elf_ia32_efi.lds
elf_ia64_efi.lds
elf_x86_64_efi.lds
fallback.c
make-certs
netboot.c
netboot.h netboot.h: fix build error on 32-bit systems Nov 12, 2013
replacements.c
replacements.h
shim.c Improve our debuginfo path print Jun 30, 2015
shim.h Ensure that apps launched by shim get correct BS->Exit() behavior Jun 11, 2015
testplan.txt
ucs2.h
version.c.in
version.h

README

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 DER-encoded public certificate in a file such as
pub.cer and build with "make VENDOR_CERT_FILE=pub.cer".