diff options
| author | Eric Biggers | 2019-07-22 09:26:23 -0700 |
|---|---|---|
| committer | Eric Biggers | 2019-08-12 19:33:50 -0700 |
| commit | 432434c9f8e18cb4cf0fe05bc3eeceada0e10dc6 (patch) | |
| tree | cfcf57b2bb1fbdb1e9b5739f020b0311405363c0 /fs/verity/Kconfig | |
| parent | add890c9f9d2d1d79184ded72f23b37b164fc673 (diff) | |
fs-verity: support builtin file signatures
To meet some users' needs, add optional support for having fs-verity
handle a portion of the authentication policy in the kernel. An
".fs-verity" keyring is created to which X.509 certificates can be
added; then a sysctl 'fs.verity.require_signatures' can be set to cause
the kernel to enforce that all fs-verity files contain a signature of
their file measurement by a key in this keyring.
See the "Built-in signature verification" section of
Documentation/filesystems/fsverity.rst for the full documentation.
Reviewed-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Diffstat (limited to 'fs/verity/Kconfig')
| -rw-r--r-- | fs/verity/Kconfig | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/fs/verity/Kconfig b/fs/verity/Kconfig index c2bca0b01ecf..88fb25119899 100644 --- a/fs/verity/Kconfig +++ b/fs/verity/Kconfig @@ -36,3 +36,20 @@ config FS_VERITY_DEBUG Enable debugging messages related to fs-verity by default. Say N unless you are an fs-verity developer. + +config FS_VERITY_BUILTIN_SIGNATURES + bool "FS Verity builtin signature support" + depends on FS_VERITY + select SYSTEM_DATA_VERIFICATION + help + Support verifying signatures of verity files against the X.509 + certificates that have been loaded into the ".fs-verity" + kernel keyring. + + This is meant as a relatively simple mechanism that can be + used to provide an authenticity guarantee for verity files, as + an alternative to IMA appraisal. Userspace programs still + need to check that the verity bit is set in order to get an + authenticity guarantee. + + If unsure, say N. |