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author | Maxime Besson <maxime.besson@smile.fr> | 2017-02-24 14:21:41 +0300 |
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committer | Maxime Besson <maxime.besson@smile.fr> | 2017-02-24 14:21:41 +0300 |
commit | 5852e0e0605e90949aec817293f45fabf5b116ac (patch) | |
tree | 0cd2f42f4166c6b6c10102dd0603adb74056c2d7 /doc/ci/ssh_keys/README.md | |
parent | a2a4fb85e26b9161f49fe7eef58fe775de760d30 (diff) |
Suggest a more secure way of handling SSH host keys in docker builds
Diffstat (limited to 'doc/ci/ssh_keys/README.md')
-rw-r--r-- | doc/ci/ssh_keys/README.md | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/doc/ci/ssh_keys/README.md b/doc/ci/ssh_keys/README.md index 49e7ac38b26..688a69d77ba 100644 --- a/doc/ci/ssh_keys/README.md +++ b/doc/ci/ssh_keys/README.md @@ -38,6 +38,15 @@ following **Settings > Variables**. As **Key** add the name `SSH_PRIVATE_KEY` and in the **Value** field paste the content of your _private_ key that you created earlier. +It is also good practice to check the server's own public key to make sure you +are not being targeted by a man-in-the-middle attack. To do this, add another +variable named `SSH_SERVER_HOSTKEYS`. To find out the hostkeys of your server, run +the `ssh-keyscan YOUR_SERVER` command from a trusted network (ideally, from the +server itself), and paste its output into the `SSH_SERVER_HOSTKEY` variable. If +you need to connect to multiple servers, concatenate all the server public keys +that you collected into the **Value** of the variable. There must be one key per +line. + Next you need to modify your `.gitlab-ci.yml` with a `before_script` action. Add it to the top: @@ -59,6 +68,11 @@ before_script: # you will overwrite your user's SSH config. - mkdir -p ~/.ssh - '[[ -f /.dockerenv ]] && echo -e "Host *\n\tStrictHostKeyChecking no\n\n" > ~/.ssh/config' + # In order to properly check the server's host key, assuming you created the + # SSH_SERVER_HOSTKEYS variable previously, uncomment the following two lines + # instead. + # - mkdir -p ~/.ssh + # - '[[ -f /.dockerenv ]] && echo "$SSH_SERVER_HOSTKEYS" > ~/.ssh/known_hosts' ``` As a final step, add the _public_ key from the one you created earlier to the |