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====== How to set up your ssh access ======

Setting up your ssh access will depend on whether you're using your PGP Auth subkey for ssh purposes or if you were issued a private key from kernel.org. 

===== If you received a ssh private key from kernel.org =====

Follow this procedure if you received an encrypted tarball containing the SSH private key to use for accessing your kernel.org account. Place that private key into your ''~/.ssh'' directory, e.g.:

  cp korg-username ~/.ssh/id_korg

You can change the automatically generated key passphrase using ''ssh-keygen -p''. 

**ALWAYS KEEP YOUR SSH KEY PROTECTED WITH A PASSPHRASE!**

Add the following entries into your .ssh/config:

  Host gitolite.kernel.org
    User git
    IdentityFile ~/.ssh/id_korg
    IdentitiesOnly yes
    ClearAllForwardings yes
    # We prefer ed25519 keys, but will fall back to others if your
    # openssh client does not support that
    HostKeyAlgorithms ssh-ed25519,ecdsa-sha2-nistp256,ssh-rsa
    # Below are very useful for speeding up repeat access
    # and for 2-factor validating your sessions
    ControlPath ~/.ssh/cm-%r@%h:%p
    ControlMaster auto
    ControlPersist 30m
    # Helps behind some NAT-ing routers
    ServerAliveInterval 60

===== If we used your PGP Authentication subkey =====

If we found an Authentication (**[A]**) subkey on your PGP key, then we have set up your access to use that key, instead of creating new ssh private keys. This is what you need to do to configure your ssh client to use that subkey:

First, add the following to your ~/.gnupg/gpg-agent.conf:

  enable-ssh-support
  
Then, add this to your .bashrc:

  export SSH_AUTH_SOCK=$(gpgconf --list-dirs agent-ssh-socket)

You will need to kill the existing gpg-agent process and start a new login session for the changes to take effect:

  $ killall gpg-agent
  $ bash
  $ ssh-add -L
  
The very first entry in the output should be the ssh public key derived from your PGP Auth subkey -- it should have "''cardno:XXXXXXXX''" at the end in the comment section.

Now add this to your .ssh/config:

  Host gitolite.kernel.org
    User git
    ClearAllForwardings yes
    # We prefer ed25519 keys, but will fall back to others if your
    # openssh client does not support that
    HostKeyAlgorithms ssh-ed25519,ecdsa-sha2-nistp256,ssh-rsa
    # Below are very useful for speeding up repeat access
    # and for 2-factor validating your sessions
    ControlPath ~/.ssh/cm-%r@%h:%p
    ControlMaster auto
    ControlPersist 30m
    # Helps behind some NAT-ing routers
    ServerAliveInterval 60

===== SSH host fingerprints =====

Your kernel.org account grants you access to gitolite.kernel.org, which you will use both  for accessing your git trees (see [[userdoc:gitolite]]) and for uploading tarball releases (see [[userdoc:kup]]).

^ Key     ^ MD5 Fingerprint                                         ^
^ RSA     | ''MD5:b1:33:44:9d:3f:77:59:14:f8:05:d7:33:5d:b1:40:7b'' |
^ ECDSA   | ''MD5:7c:a6:a2:e0:96:5f:e2:9a:9b:53:b6:41:29:66:f8:47'' |
^ ED25519 | ''MD5:30:f1:e6:8f:ff:76:45:e7:5b:45:b0:bd:bd:ca:14:9c'' |

^ Key     ^ SHA256 Fingerprint                                     ^
^ RSA     | ''SHA256:S1b2ARCfjjhsPJeqbCwkG+2ukBPCApogEfRTkVqEj4g'' |
^ ECDSA   | ''SHA256:n5cYLTSXgZ97jR9DfOcFxHeHAt3BBqU89TpTQspqFxo'' |
^ ED25519 | ''SHA256:KTfZsrwphTMpYOYr0Acfdk25gtg6zui3Oh8QOawAm5M'' |

Here they are in a PGP-signed file you can download:

<file txt fingerprints.txt.asc>
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

# ssh-keygen -E sha256 -lf <(ssh-keyscan gitolite.kernel.org)
2048 SHA256:S1b2ARCfjjhsPJeqbCwkG+2ukBPCApogEfRTkVqEj4g gitolite.kernel.org (RSA)
256  SHA256:n5cYLTSXgZ97jR9DfOcFxHeHAt3BBqU89TpTQspqFxo gitolite.kernel.org (ECDSA)
256  SHA256:KTfZsrwphTMpYOYr0Acfdk25gtg6zui3Oh8QOawAm5M gitolite.kernel.org (ED25519)

# ssh-keygen -E md5 -lf <(ssh-keyscan gitolite.kernel.org)
2048 MD5:b1:33:44:9d:3f:77:59:14:f8:05:d7:33:5d:b1:40:7b gitolite.kernel.org (RSA)
256  MD5:7c:a6:a2:e0:96:5f:e2:9a:9b:53:b6:41:29:66:f8:47 gitolite.kernel.org (ECDSA)
256  MD5:30:f1:e6:8f:ff:76:45:e7:5b:45:b0:bd:bd:ca:14:9c gitolite.kernel.org (ED25519)
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v2
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=Njcj
-----END PGP SIGNATURE-----
</file>
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