As you noticed already, our goal is to make the Codenotary integration as easy as possible for you. That’s the reason why our blog post series continues with GitLab. So far we covered Jenkins and CircleCI if you want to read them as well. For this blog post we use a GitLab CE installation.
This time we go one step further than the former posts and integrate a Git repository check as well.
The checks are going to look as follows:
- Authenticate the Git repository
- Build the container image based on the repository, if authentic
- Notarize the container image before publishing
- Publish the container image to your registry
Let’s get started!
Check our requirements first
As we only want to use notarized Git commits, we need a Codenotary account and vcn locally installed next to git.
- Codenotary Account (completely free)
- Download vcn & vcn login
- Setup the variables in your project for DockerHub and Codenotary
- Codenotary_user
- Codenotary_pass
- dockerhub (type docker info, in our case: https://index.docker.io/v1/)
- dockerhub_user
- dockerhub_pass
Setup the .gitlab-ci.yml
Like most CI/CD pipelines we start with the basic setup. Make sure to create the .gitlab-ci.yml file in your repository:
image: docker:18
stages:
- authgit
- build
- notarize
- push
variables:
CONTAINER_IMAGE: "<dockerhub_repository_name>"
before_script:
- echo -n $dockerhub_pass | docker login -u $dockerhub_user --password-stdin $dockerhubHere we set the Container_image to the Dockerhub registry we want to use (i. e. user/image) and login to Dockerhub.com
Authenticate the sources
The next step is about authenticating the sources to make sure only notarized git commits are used during the build. In that post we use the vcn version 0.7.3, but you can use the latest of course.
Be aware, as we’re using an Alpine OS based image to use the static linked version of vcn.
Most importantly, we want to make sure, that nobody tampered with the vcn executable we downloaded, therefore we do an independent check using the Codenotary.io API with curl.
# Authenticate Git source
Authenticate Git:
stage: authgit
script:
- apk add --no-cache curl
- curl -L -o /tmp/vcn https://github.com/vchain-us/vcn/releases/download/v0.7.3/vcn-v0.7.3-linux-amd64-static
- CHECKSUM=$(sha256sum /tmp/vcn | cut -d " " -f 1)
- echo $CHECKSUM
- curl -s https://api.Codenotary.io/authenticate/$CHECKSUM?org=vchain.us | grep -q :0
- chmod +x /tmp/vcn
- /tmp/vcn a git://$CI_PROJECT_DIRvcn a git://$CI_PROJECT_DIR is used to authenticate the repository we use in that project pipeline.
For the pipeline to run later on, you always need to make sure to notarize the latest git commits.
Therefore, we need to pull the latest changes and notarize them, if we approve them:
- git pull
- vcn n git://repository-folder
Important: You should only use anonymous authentication when testing or working with private repositories. It’s highly recommended to use authenticate only with org or signer flags.
vcn a help:
-I, --org string accept only authentications matching the passed organisation's ID,
if set no SignerID can be used
(overrides VCN_ORG env var, if any)
-s, --signerID strings accept only authentications matching the passed SignerID(s)
(overrides VCN_SIGNERID env var, if any)Build the image
We’re going to build the container image and push it just with the hash, but no additional tagging. That’s going to happen in a later step.
Build:
stage: build
script:
- >
docker build
--pull
--build-arg VCS_REF=$CI_COMMIT_SHA
--build-arg VCS_URL=$CI_PROJECT_URL
--tag $CONTAINER_IMAGE:$CI_COMMIT_SHA
.
- docker push $CONTAINER_IMAGE:$CI_COMMIT_SHANotarize the container image
That’s is mainly a copy of the authentication steps from the other build steps before. The reason is, that you can’t know if its just one or different GitLab Runner that pick up the tasks – so we make sure, they always are at the same stage:
# notarize container
Notarize:
stage: notarize
script:
- apk add --no-cache curl
- curl -L -o /tmp/vcn https://github.com/vchain-us/vcn/releases/download/v0.7.3/vcn-v0.7.3-linux-amd64-static
- CHECKSUM=$(sha256sum /tmp/vcn | cut -d " " -f 1)
- echo $CHECKSUM
- curl -s https://api.Codenotary.io/authenticate/$CHECKSUM?org=vchain.us | grep -q :0
- chmod +x /tmp/vcn
- VCN_USER=$Codenotary_user VCN_PASSWORD=$Codenotary_pass /tmp/vcn login
- VCN_NOTARIZATION_PASSWORD=$Codenotary_pass /tmp/vcn n --attr GitLab="$CI_COMMIT_SHA" docker://$CONTAINER_IMAGE:latest Push the image
The last steps are about pushing the newly build container image with different tags, the checksum (reference to the GitLab job) and latest.
# Here, the goal is to tag the "master" branch as "latest"
Push latest:
variables:
GIT_STRATEGY: none
stage: push
only:
# Only "master" should be tagged "latest"
- master
script:
# no guarantee that this job will be picked up by the same runner
# that built the image in the previous step, pull it again locally
- docker pull $CONTAINER_IMAGE:$CI_COMMIT_SHA
# Then we tag it "latest"
- docker tag $CONTAINER_IMAGE:$CI_COMMIT_SHA $CONTAINER_IMAGE:latest
# push it.
- docker push $CONTAINER_IMAGE:latest
Push tag:
variables:
GIT_STRATEGY: none
stage: push
only:
# run on tags only.
- tags
script:
- docker pull $CONTAINER_IMAGE:$CI_COMMIT_SHA
- docker tag $CONTAINER_IMAGE:$CI_COMMIT_SHA $CONTAINER_IMAGE:$CI_COMMIT_REF_NAME
- docker push $CONTAINER_IMAGE:$CI_COMMIT_REF_NAMEResult
Make sure to notarize the repository commits, when changing the .gitlab-ci.yml file, as that change will also stop the container image from being build – Security first!
If all went well, you should be able to get nice green checks for every single pipeline step.
In another blog post we’ll also cover how you can auto-deploy into Kubernetes and use the Kube-Notary integration to make the 360 degree security cycle complete.
