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Peter Jones 8044a321f9 Don't reject all binaries without a certificate database. 
If a binary isn't signed, but its hash is enrolled in db, it won't have
a certificate database.  So in those cases, don't check it against
certificate databases in db/dbx/etc, but we don't need to reject it
outright.

Signed-off-by: Peter Jones <pjones@redhat.com>
2013-10-22 13:40:08 -04:00
Cryptlib Reapply patches lost in the update 2013-10-04 11:51:09 -04:00
include Try to actually make debug printing look reasonable. 2013-10-04 11:51:09 -04:00
lib Put SHIM_VERBOSE under shim's guid, not global. 2013-10-04 13:54:35 -04:00
.gitignore Add ident-like blobs to shim.efi for version checking. 2013-10-03 11:11:09 -04:00
cert.S Make vendor_cert/vendor_dbx actually replaceable by an external tool. 2013-10-01 14:03:16 -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 additional bounds-checking on section sizes 2013-10-22 11:23:51 -04:00
MokManager.c additional bounds-checking on section sizes 2013-10-22 11:23:51 -04:00
MokVars.txt Add support for disabling db for verification 2013-10-02 11:29:34 -04:00
netboot.c Use CHAR8 not UINT8 for character work. 2013-10-02 10:46:26 -04:00
netboot.h Add draft version of Neil's netboot code 2012-10-12 20:14:14 -04:00
PasswordCrypt.c additional bounds-checking on section sizes 2013-10-22 11:23:51 -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
replacements.c Unhook system services as we exit. 2013-10-04 15:31:48 -04:00
replacements.h Unhook system services as we exit. 2013-10-04 15:31:48 -04:00
shim.c Don't reject all binaries without a certificate database. 2013-10-22 13:40:08 -04:00
shim.h Make SHIM_LOCK_GUID a first-class object with a symbol. 2013-09-23 10:40:49 -04:00
TODO Update for Josh's changes. 2013-10-02 13:33:52 -04:00
ucs2.h Add StrCSpn() 2013-04-30 09:46:22 -04:00
version.c.in Add ident-like blobs to shim.efi for version checking. 2013-10-03 11:11:09 -04:00
version.h Add ident-like blobs to shim.efi for version checking. 2013-10-03 11:11:09 -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.