Configuring Authentication

Authentication

SVN private repositories

  1. Subversion creates an authentication structure in

    ~/.subversion/auth/svn.simple/<hash>
    
  2. In order to properly create the authentication file for your SVN servers you will need to authenticate to them and let svn build out the proper hashed files.

    $ svn list http://<domain:port>/svn/<somerepo>
    Authentication realm: <http://<domain> Subversion Repository
    Username: test
    Password for 'test':
    
  3. Once we’ve properly authenticated we want to share the .subversion directory with the Athens proxy server in order to reuse those credentials. Below we’re setting it as a volume on our proxy container.

    Bash

    export ATHENS_STORAGE=~/athens-storage
    export ATHENS_SVN=~/.subversion
    mkdir -p $ATHENS_STORAGE
    docker run -d -v $ATHENS_STORAGE:/var/lib/athens \
      -v $ATHENS_SVN:/root/.subversion \
      -e ATHENS_DISK_STORAGE_ROOT=/var/lib/athens \
      -e ATHENS_STORAGE_TYPE=disk \
      --name athens-proxy \
      --restart always \
      -p 3000:3000 \
      gomods/athens:latest
    

    PowerShell

    $env:ATHENS_STORAGE = "$(Join-Path $pwd athens-storage)"
    $env:ATHENS_SVN = "$(Join-Path $pwd .subversion)"
    md -Path $env:ATHENS_STORAGE
    docker run -d -v "$($env:ATHENS_STORAGE):/var/lib/athens" `
      -v "$($env:ATHENS_SVN):/root/.subversion" `
      -e ATHENS_DISK_STORAGE_ROOT=/var/lib/athens `
      -e ATHENS_STORAGE_TYPE=disk `
      --name athens-proxy `
      --restart always `
      -p 3000:3000 `
      gomods/athens:latest
    

Bazaar(bzr) private repositories

  1. Bazaaar config files are located in
  • Unix

    ~/.bazaar/

  • Windows

    C:\Documents and Settings<username>\Application Data\Bazaar\2.0

  • You can check your location using

    bzr version

  1. There are 3 typical configuration files
  • bazaar.conf
    • default config options
  • locations.conf
    • branch specific overrides and/or settings
  • authentication.conf
    • credential information for remote servers
  1. Configuration file syntax
  • # this is a comment
  • [header] this denotes a section header
  • section options reside in a header section and contain an option name an equals sign and a value

  1. Authentication Configuration

Allows one to specify credentials for remote servers. This can be used for all the supported transports and any part of bzr that requires authentication(smtp for example). The syntax obeys the same rules as the others except for the option policies which don’t apply.

Example:

[myprojects] scheme=ftp host=host.com user=joe password=secret

# Pet projects on hobby.net

[hobby] host=r.hobby.net user=jim password=obvious1234

# Home server

[home] scheme=https host=home.net user=joe password=lessobV10us

[DEFAULT]

# Our local user is barbaz, on all remote sites we’re known as foobar

user=foobar

NOTE: when using sftp the scheme is ssh and a password isn’t supported you should use PPK

[reference code] scheme=https host=dev.company.com path=/dev user=user1 password=pass1

# development branches on dev server

[dev] scheme=ssh # bzr+ssh and sftp are availablehere host=dev.company.com path=/dev/integration user=user2

#proxy [proxy] scheme=http host=proxy.company.com port=3128 user=proxyuser1 password=proxypass1

  1. Once we’ve properly setup our authentication we want to share the bazaar configuration directory with the Athens proxy server in order to reuse those credentials. Below we’re setting it as a volume on our proxy container.

Bash

   export ATHENS_STORAGE=~/athens-storage
   export ATHENS_BZR=~/.bazaar
   mkdir -p $ATHENS_STORAGE
   docker run -d -v $ATHENS_STORAGE:/var/lib/athens \
     -v $ATHENS_BZR:/root/.bazaar \
     -e ATHENS_DISK_STORAGE_ROOT=/var/lib/athens \
     -e ATHENS_STORAGE_TYPE=disk \
     --name athens-proxy \
     --restart always \
     -p 3000:3000 \
     gomods/athens:latest

PowerShell

   $env:ATHENS_STORAGE = "$(Join-Path $pwd athens-storage)"
   $env:ATHENS_BZR = "$(Join-Path $pwd .bazaar)"
   md -Path $env:ATHENS_STORAGE
   docker run -d -v "$($env:ATHENS_STORAGE):/var/lib/athens" `
     -v "$($env:ATHENS_BZR):/root/.bazaar" `
     -e ATHENS_DISK_STORAGE_ROOT=/var/lib/athens `
     -e ATHENS_STORAGE_TYPE=disk `
     --name athens-proxy `
     --restart always `
     -p 3000:3000 `
     gomods/athens:latest

Altassian Bitbucket and SSH-secured git VCS’s

This section was originally written to describe configuring the Athens git client to fetch specific Go imports over SSH instead of HTTP against an on-prem instance of Atlassian Bitbucket. With some adjustment it may point the way to configuring the Athens proxy for authenticated access to hosted Bitbucket and other SSH-secured VCS’s. If your developer workflow requires that you clone, push, and pull Git repositories over SSH and you want Athens to perform the same way, please read on.

As a developer at example.com, assume your application has a dependency described by this import which is hosted on Bitbucket

import "git.example.com/golibs/logo"

Further, assume that you would manually clone this import like this

$ git clone ssh://git@git.example.com:7999/golibs/logo.git

A go-get client, such as that called by Athens, would begin resolving this dependency by looking for a go-import meta tag in this output

$ curl -s https://git.example.com/golibs/logo?go-get=1
<?xml version="1.0"?>
<!DOCTYPE html>
<html lang="en">
   <head>
      <meta charset="utf-8">
         <meta name="go-import" content="git.example.com/golibs/logo git https://git.example.com/scm/golibs/logo.git"/>
         <body/>
      </meta>
   </head>
</html>

which says the content of the Go import actually resides at https://git.example.com/scm/golibs/logo.git. Comparing this URL to what we would normally use to clone this project over SSH (above) suggests this global Git config http to ssh rewrite rule

[url "ssh://git@git.example.com:7999"]
	insteadOf = https://git.example.com/scm

So to fetch the git.example.com/golibs/logo dependency over SSH to populate its storage cache, Athens ultimately calls git, which, given that rewrite rule, in turn needs an SSH private key matching a public key bound to the cloning developer or service account on Bitbucket. This is essentially the github.com SSH model. At a bare minimum, we need to provide Athens with an SSH private key and the http to ssh git rewrite rule, mounted inside the Athens container for use by the root user

$ mkdir -p storage
$ ATHENS_STORAGE=storage
$ docker run --rm -d \
    -v "$PWD/$ATHENS_STORAGE:/var/lib/athens" \
    -v "$PWD/gitconfig/.gitconfig:/root/.gitconfig" \
    -v "$PWD/ssh-keys:/root/.ssh" \
    -e ATHENS_DISK_STORAGE_ROOT=/var/lib/athens -e ATHENS_STORAGE_TYPE=disk --name athens-proxy -p 3000:3000 gomods/athens:canary

$PWD/gitconfig/.gitconfig contains the http to ssh rewrite rule

[url "ssh://git@git.example.com:7999"]
	insteadOf = https://git.example.com/scm

$PWD/ssh-keys contains the aforementioned private key and a minimal ssh-config

$ ls ssh-keys/
config		id_rsa

We also provide an ssh config to bypass host SSH key verification and to show how to bind different hosts to different SSH keys

$PWD/ssh-keys/config contains

Host git.example.com
Hostname git.example.com
StrictHostKeyChecking no
IdentityFile /root/.ssh/id_rsa

Now, builds executed through the Athens proxy should be able to clone the git.example.com/golibs/logo dependency over authenticated SSH.

SSH_AUTH_SOCK and ssh-agent Support

As an alternative to passwordless SSH keys, one can use an ssh-agent. The ssh-agent-set SSH_AUTH_SOCK environment variable will propagate to go mod download if it contains a path to a valid unix socket (after following symlinks).

As a result, if running with a working ssh agent (and a shell with SSH_AUTH_SOCK set), after setting up a gitconfig as mentioned in the previous section, one can run athens in docker as such:

$ mkdir -p storage
$ ssh-add .ssh/id_rsa_something
$ ATHENS_STORAGE=storage
$ docker run --rm -d \
    -v "$PWD/$ATHENS_STORAGE:/var/lib/athens" \
    -v "$PWD/gitconfig/.gitconfig:/root/.gitconfig" \
    -v "${SSH_AUTH_SOCK}:/.ssh_agent_sock" \
    -e "SSH_AUTH_SOCK=/.ssh_agent_sock" \
    -e ATHENS_DISK_STORAGE_ROOT=/var/lib/athens -e ATHENS_STORAGE_TYPE=disk --name athens-proxy -p 3000:3000 gomods/athens:canary
Fork me on GitHub