DeveloperWiki:Signing Packages

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Warning: This is just a draft and work in progress. Don't even read it.

List of Packager Keys

After you finished not reading this, please go to DeveloperWiki:Signing_Packages/Packager_Keys.

Choose an UID

  • Use your real name. It has to be exactly the one that can be found on official documents like your passport or driver's license. Have a look at http://wiki.cacert.org/PracticeOnNames
  • Use a valid e-mail address. Means no obfuscation.
  • The e-mail address should be reliable (so don't use the one you got from your ISP a random free mail address).
  • If in doubt you should prefer using your archlinux.org address
  • The UID has also to be the same as the PACKAGER variable you use to build packages
  • An UID looks like this: Pierre Schmitz <pierre@archlinux.de>

Create a key pair

  1. install gnupg
  2. gpg --gen-key
    1. you may use the default options which is a 2048 Bit RSA key for encryption and signing which does not expire
  3. Also create a revoke key for later use
    1. gpg -o ~/.gnupg/pierre@archlinux.de-revoke.asc --gen-revoke pierre@archlinux.de
    2. Make sure to create a backup of this file and remove it from your system afterwards
  4. Backup your private key: gpg --export-secret-keys pierre@archlinux.de > pierre@archlinux.de-private.asc

Get your key signed by CAcert

  1. Get the CAcert key and import it:
    1. wget https://www.cacert.org/certs/cacert.asc
    2. gpg --import cacert.asc
  2. Trust this key:
    1. gpg --edit-key gpg@cacert.org
    2. >trust
    3. >5
  3. Export your key:
    1. gpg --export --armor pierre@archlinux.de > pierre@archlinux.de.asc
    2. Paste the content of that file into the form on the CAcert website to get your signed public key.
  4. Save the signed key from the CAcert website and import it
    1. gpg --import <filename>
  5. You might want to send your new signed key to a keyserver
    1. Check your key id with gpg -k
    2. gpg --send-keys 9741E8AC
    3. You could also export it again for uploading it on e.g. your webspace: gpg --export --armor pierre@archlinux.de > pierre@archlinux.de.asc
  6. You should create a backup of your keys and make sure to not forget the passphrase!

Sign your packages

  1. Install devtools 0.9.22 or later
  2. add SIGNPKG=y to your ~/.makepkg.conf
  3. If you want to sign with a specific key also add GPGKEY=<id>
  4. commitpkg and its aliases like extrapkg or testingpkg will now sign your packages and upload the package including its signature.

Verify a signed package (just for testing)

  1. Install and trust the CAcert key
    1. wget https://www.cacert.org/certs/cacert.asc
    2. gpg --import cacert.asc
    3. gpg --edit-key gpg@cacert.org
    4. >trust
    5. >5
  2. Search and import the packager's key
    1. gpg --search-keys 9741E8AC
  3. Verify the package
    1. gpg --verify devtools-*.pkg.tar.xz.sig

Open questions

  • How do we handle keys that expire?
  • Will we re-sign packages of a dev who left the team?
  • How do we verify the identity of devs who have no CAcert assurers near their location?