Stefan Berger
a76a5c5128
When IMA and EVM are used for file appraisal then EVM verifies the signature stored in security.evm. This signature covers file metadata (uid, gid, mode bits, etc.) as well as the security.ima xattr. Therefore, it is sufficient that only files' hashes are stored in security.ima. This also leads to slight performance improvements since IMA appraisal will then only verify that a file's hash matches the expected hash stored in security.ima. EVM will ensure that the signature over all the file metadata and security.ima xattr is correct. Therefore, give the user control over whether to store file signatures (--imasig) in ima.security or hashes (--imahash) by setting the option in IMA_EVM_IMA_XATTR_OPT. Only test-verify an IMA signature if --imasig is used as the option. Signed-off-by: Stefan Berger <stefanb@linux.ibm.com> Signed-off-by: Armin Kuster <akuster808@gmail.com>
Master-next:
Master: 
Meta-security
The bbappend files for some recipes (e.g. linux-yocto) in this layer need to have 'security' in DISTRO_FEATURES to have effect. To enable them, add in configuration file the following line.
DISTRO_FEATURES:append = " security"
If meta-security is included, but security is not enabled as a distro feature a warning is printed at parse time:
You have included the meta-security layer, but
'security' has not been enabled in your DISTRO_FEATURES. Some bbappend files
and preferred version setting may not take effect.
If you know what you are doing, this warning can be disabled by setting the following variable in your configuration:
SKIP_META_SECURITY_SANITY_CHECK = 1
This layer provides security tools, hardening tools for Linux kernels and libraries for implementing security mechanisms.
Dependencies
This layer depends on:
URI: git://git.openembedded.org/openembedded-core branch: [same one as checked out for this layer]
URI: git://git.openembedded.org/meta-openembedded/meta-oe branch: [same one as checked out for this layer]
Adding the security layer to your build
In order to use this layer, you need to make the build system aware of it.
Assuming the security layer exists at the top-level of your yocto build tree, you can add it to the build system by adding the location of the security layer to bblayers.conf, along with any other layers needed. e.g.:
BBLAYERS ?= "
/path/to/oe-core/meta
/path/to/meta-openembedded/meta-oe
/path/to/layer/meta-security "
Optional Dynamic layer dependancy
URI: git://git.openembedded.org/meta-openembedded/meta-oe
URI: git://git.openembedded.org/meta-openembedded/meta-perl
URI: git://git.openembedded.org/meta-openembedded/meta-python
BBLAYERS += "/path/to/layer/meta-openembedded/meta-oe" BBLAYERS += "/path/to/layer/meta-openembedded/meta-perl" BBLAYERS += "/path/to/layer/meta-openembedded/meta-python"
This will activate the dynamic-layer mechanism.
Maintenance
Send pull requests, patches, comments or questions to yocto-patches@lists.yoctoproject.org
When sending single patches, please using something like: 'git send-email -1 --to yocto-patches@lists.yoctoproject.org --subject-prefix=meta-security][PATCH'
These values can be set as defaults for this repository:
$ git config sendemail.to yocto-patches@lists.yoctoproject.org $ git config format.subjectPrefix meta-security][PATCH
Now you can just do 'git send-email origin/master' to send all local patches.
For pull requests, please use create-pull-request and send-pull-request.
Maintainers: Armin Kuster akuster808@gmail.com
License
All metadata is MIT licensed unless otherwise stated. Source code included in tree for individual recipes is under the LICENSE stated in each recipe (.bb file) unless otherwise stated.