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diff --git a/doc/user/project/gpg_signed_commits/img/profile_settings_gpg_keys_paste_pub.png b/doc/user/project/gpg_signed_commits/img/profile_settings_gpg_keys_paste_pub.png Binary files differnew file mode 100644 index 00000000000..8e26d98f1b0 --- /dev/null +++ b/doc/user/project/gpg_signed_commits/img/profile_settings_gpg_keys_paste_pub.png diff --git a/doc/user/project/gpg_signed_commits/img/profile_settings_gpg_keys_single_key.png b/doc/user/project/gpg_signed_commits/img/profile_settings_gpg_keys_single_key.png Binary files differnew file mode 100644 index 00000000000..5c14df36d73 --- /dev/null +++ b/doc/user/project/gpg_signed_commits/img/profile_settings_gpg_keys_single_key.png diff --git a/doc/user/project/gpg_signed_commits/img/project_signed_and_unsigned_commits.png b/doc/user/project/gpg_signed_commits/img/project_signed_and_unsigned_commits.png Binary files differnew file mode 100644 index 00000000000..33936a7d6d7 --- /dev/null +++ b/doc/user/project/gpg_signed_commits/img/project_signed_and_unsigned_commits.png diff --git a/doc/user/project/gpg_signed_commits/img/project_signed_commit_unverified_signature.png b/doc/user/project/gpg_signed_commits/img/project_signed_commit_unverified_signature.png Binary files differnew file mode 100644 index 00000000000..22565cf7c7e --- /dev/null +++ b/doc/user/project/gpg_signed_commits/img/project_signed_commit_unverified_signature.png diff --git a/doc/user/project/gpg_signed_commits/img/project_signed_commit_verified_signature.png b/doc/user/project/gpg_signed_commits/img/project_signed_commit_verified_signature.png Binary files differnew file mode 100644 index 00000000000..1778b2ddf2b --- /dev/null +++ b/doc/user/project/gpg_signed_commits/img/project_signed_commit_verified_signature.png diff --git a/doc/user/project/gpg_signed_commits/index.md b/doc/user/project/gpg_signed_commits/index.md new file mode 100644 index 00000000000..3ea2203c895 --- /dev/null +++ b/doc/user/project/gpg_signed_commits/index.md @@ -0,0 +1,245 @@ +# Signing commits with GPG + +> [Introduced][ce-9546] in GitLab 9.5. + +GitLab can show whether a commit is verified or not when signed with a GPG key. +All you need to do is upload the public GPG key in your profile settings. + +GPG verified tags are not supported yet. + +## Getting started with GPG + +Here are a few guides to get you started with GPG: + +- [Git Tools - Signing Your Work](https://git-scm.com/book/en/v2/Git-Tools-Signing-Your-Work) +- [Managing OpenPGP Keys](https://riseup.net/en/security/message-security/openpgp/gpg-keys) +- [OpenPGP Best Practices](https://riseup.net/en/security/message-security/openpgp/best-practices) +- [Creating a new GPG key with subkeys](https://www.void.gr/kargig/blog/2013/12/02/creating-a-new-gpg-key-with-subkeys/) (advanced) + +## How GitLab handles GPG + +GitLab uses its own keyring to verify the GPG signature. It does not access any +public key server. + +In order to have a commit verified on GitLab the corresponding public key needs +to be uploaded to GitLab. For a signature to be verified two prerequisites need +to be met: + +1. The public key needs to be added your GitLab account +1. One of the emails in the GPG key matches your **primary** email + +## Generating a GPG key + +If you don't already have a GPG key, the following steps will help you get +started: + +1. [Install GPG](https://www.gnupg.org/download/index.html) for your operating system +1. Generate the private/public key pair with the following command: + + ```sh + gpg --full-gen-key + ``` + + This will spawn a series of questions. + +1. The first question is which algorithm can be used. Select the kind you want + or press <kbd>Enter</kbd> to choose the default (RSA and RSA): + + ``` + Please select what kind of key you want: + (1) RSA and RSA (default) + (2) DSA and Elgamal + (3) DSA (sign only) + (4) RSA (sign only) + Your selection? 1 + ``` + +1. The next question is key length. We recommend to choose the highest value + which is `4096`: + + ``` + RSA keys may be between 1024 and 4096 bits long. + What keysize do you want? (2048) 4096 + Requested keysize is 4096 bits + ``` +1. Next, you need to specify the validity period of your key. This is something + subjective, and you can use the default value which is to never expire: + + ``` + Please specify how long the key should be valid. + 0 = key does not expire + <n> = key expires in n days + <n>w = key expires in n weeks + <n>m = key expires in n months + <n>y = key expires in n years + Key is valid for? (0) 0 + Key does not expire at all + ``` + +1. Confirm that the answers you gave were correct by typing `y`: + + ``` + Is this correct? (y/N) y + ``` + +1. Enter you real name, the email address to be associated with this key (should + match the primary email address you use in GitLab) and an optional comment + (press <kbd>Enter</kbd> to skip): + + ``` + GnuPG needs to construct a user ID to identify your key. + + Real name: Mr. Robot + Email address: mr@robot.sh + Comment: + You selected this USER-ID: + "Mr. Robot <mr@robot.sh>" + + Change (N)ame, (C)omment, (E)mail or (O)kay/(Q)uit? O + ``` + +1. Pick a strong password when asked and type it twice to confirm. +1. Use the following command to list the private GPG key you just created: + + ``` + gpg --list-secret-keys mr@robot.sh + ``` + + Replace `mr@robot.sh` with the email address you entered above. + +1. Copy the GPG key ID that starts with `sec`. In the following example, that's + `0x30F2B65B9246B6CA`: + + ``` + sec rsa4096/0x30F2B65B9246B6CA 2017-08-18 [SC] + D5E4F29F3275DC0CDA8FFC8730F2B65B9246B6CA + uid [ultimate] Mr. Robot <mr@robot.sh> + ssb rsa4096/0xB7ABC0813E4028C0 2017-08-18 [E] + ``` + +1. Export the public key of that ID (replace your key ID from the previous step): + + ``` + gpg --armor --export 0x30F2B65B9246B6CA + ``` + +1. Finally, copy the public key and [add it in your profile settings](#adding-a-gpg-key-to-your-account) + +## Adding a GPG key to your account + +>**Note:** +Once you add a key, you cannot edit it, only remove it. In case the paste +didn't work, you'll have to remove the offending key and re-add it. + +You can add a GPG key in your profile's settings: + +1. On the upper right corner, click on your avatar and go to your **Settings**. + +  + +1. Navigate to the **GPG keys** tab and paste your _public_ key in the 'Key' + box. + +  + +1. Finally, click on **Add key** to add it to GitLab. You will be able to see + its fingerprint, the corresponding email address and creation date. + +  + +## Associating your GPG key with Git + +After you have [created your GPG key](#generating-a-gpg-key) and [added it to +your account](#adding-a-gpg-key-to-your-account), it's time to tell Git which +key to use. + +1. Use the following command to list the private GPG key you just created: + + ``` + gpg --list-secret-keys mr@robot.sh + ``` + + Replace `mr@robot.sh` with the email address you entered above. + +1. Copy the GPG key ID that starts with `sec`. In the following example, that's + `0x30F2B65B9246B6CA`: + + ``` + sec rsa4096/0x30F2B65B9246B6CA 2017-08-18 [SC] + D5E4F29F3275DC0CDA8FFC8730F2B65B9246B6CA + uid [ultimate] Mr. Robot <mr@robot.sh> + ssb rsa4096/0xB7ABC0813E4028C0 2017-08-18 [E] + ``` + +1. Tell Git to use that key to sign the commits: + + ``` + git config --global user.signingkey 0x30F2B65B9246B6CA + ``` + + Replace `0x30F2B65B9246B6CA` with your GPG key ID. + +## Signing commits + +After you have [created your GPG key](#generating-a-gpg-key) and [added it to +your account](#adding-a-gpg-key-to-your-account), you can start signing your +commits: + +1. Commit like you used to, the only difference is the addition of the `-S` flag: + + ``` + git commit -S -m "My commit msg" + ``` + +1. Enter the passphrase of your GPG key when asked. +1. Push to GitLab and check that your commits [are verified](#verifying-commits). + +If you don't want to type the `-S` flag every time you commit, you can tell Git +to sign your commits automatically: + +``` +git config --global commit.gpgsign true +``` + +## Verifying commits + +1. Within a project or [merge request](../merge_requests/index.md), navigate to + the **Commits** tab. Signed commits will show a badge containing either + "Verified" or "Unverified", depending on the verification status of the GPG + signature. + +  + +1. By clicking on the GPG badge, details of the signature are displayed. + +  + +  + +## Revoking a GPG key + +Revoking a key **unverifies** already signed commits. Commits that were +verified by using this key will change to an unverified state. Future commits +will also stay unverified once you revoke this key. This action should be used +in case your key has been compromised. + +To revoke a GPG key: + +1. On the upper right corner, click on your avatar and go to your **Settings**. +1. Navigate to the **GPG keys** tab. +1. Click on **Revoke** besides the GPG key you want to delete. + +## Removing a GPG key + +Removing a key **does not unverify** already signed commits. Commits that were +verified by using this key will stay verified. Only unpushed commits will stay +unverified once you remove this key. To unverify already signed commits, you need +to [revoke the associated GPG key](#revoking-a-gpg-key) from your account. + +To remove a GPG key from your account: + +1. On the upper right corner, click on your avatar and go to your **Settings**. +1. Navigate to the **GPG keys** tab. +1. Click on the trash icon besides the GPG key you want to delete. + +[ce-9546]: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/9546 |
