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Peter Jones a1f2863584 Make vendor_cert/vendor_dbx actually replaceable by an external tool. 
This moves them both to be computed at runtime from a pointer+offset
rather than just a pointer, so that their real address can be entirely
derived from the section they're in.

This means you can replace the whole .vendor_cert section with a new one
with certs that don't have the same size.
2013-10-01 14:03:16 -04:00
Cryptlib Adjust the result of gmtime() to fit the definition 2013-09-26 11:58:02 -04:00
include integrate security override 2013-09-26 11:58:03 -04:00
lib integrate security override 2013-09-26 11:58:03 -04:00
.gitignore Ignore tarballs. 2013-09-26 09:56:32 -04:00
cert.S Make vendor_cert/vendor_dbx actually replaceable by an external tool. 2013-10-01 14:03:16 -04:00
console_control.h MokManager needs to disable the graphics console. 2013-09-26 09:56:26 -04:00
COPYRIGHT Add copyright file 2012-07-09 11:03:12 -04:00
crypt_blowfish.c MokManager: support blowfish-based crypt() hash 2013-09-26 11:58:01 -04:00
crypt_blowfish.h MokManager: support blowfish-based crypt() hash 2013-09-26 11:58:01 -04:00
elf_ia32_efi.lds Move embedded certificates to their own section. 2013-06-10 17:35:33 -04:00
elf_ia64_efi.lds Move embedded certificates to their own section. 2013-06-10 17:35:33 -04:00
elf_x86_64_efi.lds Move embedded certificates to their own section. 2013-06-10 17:35:33 -04:00
fallback.c Fix some minor type errors. 2013-05-15 13:37:15 -04:00
make-certs Sign MokManager with a locally-generated key 2012-11-26 13:43:50 -05:00
Makefile Make vendor_cert/vendor_dbx actually replaceable by an external tool. 2013-10-01 14:03:16 -04:00
MokManager.c Don't use LibGetVariable(), since it doesn't give us real error codes. 2013-09-26 13:44:05 -04:00
MokVars.txt Add documentation of the Mok variables 2012-10-30 16:14:02 -04:00
netboot.c Since different distros name grub*.efi differently, make it compile-time. 2013-09-26 11:58:02 -04:00
netboot.h Add draft version of Neil's netboot code 2012-10-12 20:14:14 -04:00
PasswordCrypt.c MokManager: support Tradition DES hash 2013-09-26 11:58:01 -04:00
PasswordCrypt.h MokManager: support Tradition DES hash 2013-09-26 11:58:01 -04:00
README Add basic documentation 2012-07-28 00:42:43 -04:00
shim.c Make vendor_cert/vendor_dbx actually replaceable by an external tool. 2013-10-01 14:03:16 -04:00
shim.h Make SHIM_LOCK_GUID a first-class object with a symbol. 2013-09-23 10:40:49 -04:00
TODO Remove TODO items fixed by merging lf_merge and lcp/lf-security-override. 2013-10-01 14:03:16 -04:00
ucs2.h Add StrCSpn() 2013-04-30 09:46:22 -04:00

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 hex dump of the public certificate in cert.h
and build it with make.