This Debian/Ubuntu errata_parser can use the "Debian Security Announcements (DSA)" and "Ubuntu Security Notices (USN)" to generate YAML files containing up to date Debian or Ubuntu erratum information.
It is designed to be used in conjunction with the accompanying errata_server project (https://github.com/ATIX-AG/errata_server), to provide a Debian/Ubuntu errata service.
This errata service is ultimately intended for use with Katello (https://github.com/Katello/katello).
However, at the time of writing the needed changes to Katello have not yet been merged.
This quick start guide covers the basic installation and usage of this repository for a typical developer use case.
There also is a puppet-module for installing the errata-parser and -server: https://github.com/chrisongthb/puppet-errata_parser
The first time installation steps only need to be performed once after checking out this repository.
To use this repository you will need to install several packages. On Debian they include:
ruby (tested with version 2.5)
bundler
libapt-pkg-dev
If you want to build the Docker image provided by this repository, you will also need a working Docker installation (https://docs.docker.com/install/).
Note: If you notice additional dependencies when using this repository, please let us know so we can improve this README.md file.
Do feel free to open a pull request!
Use bundle install in the repository root to install the needed ruby dependencies:
bundle install --path vendor/bundle
Using --path vendor/bundle will ensure that all ruby dependencies are installed within the vendor folder, which is included in this repositories .gitignore file.
This is generally preferrable than installing to the system RubyGems!
You can add a git hook that enables syntax checking using rubocop before committing, by running the following script:
scripts/bootstrap.sh
The gen_errata.rb script is mainly intended for local usage during development.
Only the Docker container (explained below) is intended for production use.
You can generate Ubuntu errata information by running the gen_errata.rb script as follows:
bundle exec debRelease.rb ubuntu > packages_everything.json
bundle exec gen_errata.rb ubuntu > errata_ubuntu.yaml
The packages_everything.json file from the first of these two commands stores package information from the Ubuntu security repository (http://security.ubuntu.com/ubuntu)
This is needed to make sure to only handle referenced packages which are provided by repository.
Note that the ubuntu argument of the gen_errata.rb script is hard coded to use https://usn.ubuntu.com/usn-db/database.json.bz2 as its source of information, and to generate errata for bionic for amd64 only.
You can generate Debian errata information by running the gen_errata.rb script as follows:
bundle exec debRelease.rb debian > packages_everything.json
bundle exec gen_errata.rb debian > errata_debian.yaml
The packages_everything.json file from the first of these two commands stores package information from the Debian security repository (http://security.debian.org/debian-security)
This is needed to map the source packages referenced in the Debian Security Announcements to the binary packages listed in the final errata_debian.yaml file.
Note that the debian argument of the gen_errata.rb script is hard coded to use https://salsa.debian.org/security-tracker-team/security-tracker/raw/master/data/DSA/list and https://security-tracker.debian.org/tracker/data/json as its source of information, and to generate errata for stretch for amd64 only.
To run the tests for this repository use:
bundle exec ruby test/all.rb
If you make changes to this repository, it may become necessary to re-record the test data:
bundle exec gen_errata.rb debian_test_record > test/data/debian.yaml
bundle exec gen_errata.rb ubuntu_test_record > test/data/ubuntu.yaml
Note that pull requests will only be accepted once all tests run both within and outside of the container.
The errata parser provided by this repository is intended for use within a Docker container.
To build the relevant container image use:
docker build -t errata_parser:latest .
Note that the image build uses a .dockerignore whitelist to ensure only those files we really need are sent to the build context.
If you want to add aditional files to the container image, you will need to add them to the whitelist.
Once built, you can run the tests within the container as follows:
docker run --rm errata_parser:latest bundle exec ruby test/all.rb
If you want to run the container interactively to see what the world looks like from within it, you can use:
docker run --rm -it --entrypoint=/bin/bash errata_parser:latest
We recommend using the following set of commands for a feature run of the errata parser:
docker volume create errata
docker volume create errata_parser_temp
docker run --rm \
--mount type=volume,source=errata,target=/errata \
--mount type=volume,source=errata_parser_temp,target=/tmp/errata_parser \
errata_parser:latest
A so defined feature run will use the errata parsers default configuration, as defined by the default_config.json file.
(Within the container this file is located at /etc/errata_parser.json.)
To supply an individual container run with an alternate configuration add the following option to the docker run command:
--mount type=bind,source=<absolute_path_to_user_config>,target=/etc/errata_parser.json
Also see the "Configuration" section under "Advanced Topics" below.
The container will run as configured, and place any output in the errata volume.
This volume also serves as the interface to the errata_server project.
The container's output files use JSON format, since the errata_server wants JSON.
In addition to the errata lists themselves, the container will also generate a configuration file for each errata list.
These configuration files will tell the errata_server what releases, components, and architectures each errata list contains.
A successfull run of the errata parser container, using the default configuration found in the default_config.json file from this repository, will result in the following new files:
debian_config.json
debian_errata.json
ubuntu_config.json
ubuntu_errata.json
This section of the readme provides some additional background information, for those who want to delve deeper.
This section collects various links were Debian and Ubuntu security information is published. Not all of these are in use (and have been tested) with the default configuration of this errata parser.
- Debian Security Tracker (derived from DSAs):
- List of DSAs from the website-source-code
- JSON-file including all information from Debian Security Tracker (sorted by package-name, CVE-number, release-name)
- Ubuntu Security Notices (USN)
- JSON-file1 including all information from Ubuntu Security Notifications (sorted by USN-number, release); includes binary-versions
- https://usn.ubuntu.com/usn-db/database.json (https://usn.ubuntu.com/usn-db/database.json.sha256)
- https://usn.ubuntu.com/usn-db/database-all.json (https://usn.ubuntu.com/usn-db/database-all.json.sha256)
- https://usn.ubuntu.com/usn-db/database.json.bz2 (https://usn.ubuntu.com/usn-db/database.json.bz2.sha256)
- https://usn.ubuntu.com/usn-db/database-all.json.bz2 (https://usn.ubuntu.com/usn-db/database-all.json.bz2.sha256)
When used locally the errata parser produces output in YAML format.
However, the errata parser container produces structurally the same output in JSON instead.
The reason is that the errata_server companion project requires JSON for input.
See the following example for the structure of an individual erratum entry (in YAML):
- name: DSA-4283-1
title: ruby-json-jwt -- security update
issued: "31 Aug 2018"
affected_source_package: ruby-json-jwt
packages:
- name: ruby-json-jwt
version: 1.6.2-1+deb9u1
architecture: all
component: main
release: stretch
description: 'Nov json-jwt version >= 0.5.0 && < 1.9.4 contains a CWE-347: Improper
Verification of Cryptographic Signature vulnerability in Decryption of AES-GCM
encrypted JSON Web Tokens that can result in Attacker can forge a authentication
tag. This attack appear to be exploitable via network connectivity. This vulnerability
appears to have been fixed in 1.9.4 and later.'
cves:
- CVE-2018-1000539
severity: medium
scope: remote
dbts_bugs:
- 902721
As previously mentioned, container runs can (and must) be configured via a configuration file named config.json present in the /errata/ folder within the container.
As the .json extension suggests, the configuration file must contain a specific JSON data structure.
The default configuration is given by the default_config.json file within this repository which is also used for testing.
The top level data structure within the configuration file may contain the following fields:
{
"tempdir": "tmp/errata_parser",
"debian": <debian_dict>,
"ubuntu": <ubuntu_dict>
}
The tempdir field gives the location to which the errata parser will download the upstream sources of information.
In the usage examples within this README, we mount an external folder to this location within the container.
This can improve performance, since the errata parser will NOT re-download these files if there is no newer version available on the upstream server than has already been downloaded.
The debian and ubuntu fields must be given if errata are to be generate for the respective operating systems.
The <debian_dict> must contain the following fields:
"debian": {
"dsa_list_url": <url>,
"cve_list_url": <url>,
"repository": <repository_dict>,
"whitelists": <whitelists_dict>,
"aliases": <aliases_dict>
}
Note that for debian, we require three upstream sources of information to generate errata:
The dsa.list file obtained via the dsa_list_url associates CVEs with debian binary packages.
The cve.json obtained via cve_list_url contains the actual information associated with these CVEs.
The repository must be a debian-security repository, containing the relevant binary packages.
The whitelists field allows users to filter the Debian repositories for which errata should be generated by "releases", "components", and "architectures".
An example:
whitelists: {
"releases": ["stretch"],
"components": ["main", "contrib"],
"architectures": ["amd64", "armhf"]
}
If no components (or architectures) are given, this is interpreted as "all components (or architectures)".
The aliases field is needed since the accompanying errata_server must be able to associate Debian security repositories like stretch/updates with errata for Debian stretch.
The <ubuntu_dict> is somewhat simpler than that for Debian:
"ubuntu": {
"usn_list_url": <url>,
"whitelists": <whitelists_dict>,
"aliases": <aliases_dict>
}
A single USN URL will suffice as an upstream source of information.
whitelists and aliases are structurally identical to those for Debian.
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