Add: first version

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diff --git a/ssh-config.md b/ssh-config.md
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+---
+title: SSH client config for WMF
+author: Lars Wirzenius
+bindings: ssh-config.yaml
+functions: ssh-config.py
+...
+
+# Introduction
+
+I need to access certain servers for my work at WMF using SSH. For
+this to work, I need an SSH client config that uses the right SSH keys
+and routes access via a "bastion" server. This document has acceptance
+criteria for my config.
+
+My configuation is based on the one [on
+wikitech](https://wikitech.wikimedia.org/wiki/Production_access#Setting_up_your_SSH_config):
+
+~~~
+# Configure the initial connection to the bastion host, with the one HostName closest to you
+Host bast
+    User your_username_here
+    HostName bast1002.wikimedia.org
+    IdentityFile ~/.ssh/your_production_ssh_key
+    ForwardAgent no
+    IdentitiesOnly yes
+
+# Proxy all connections to internal servers through the bastion host
+Host *.wmnet
+    User your_username_here
+    ProxyCommand ssh -W %h:%p bast
+    IdentityFile ~/.ssh/your_production_ssh_key
+    ForwardAgent no
+    IdentitiesOnly yes
+~~~
+
+# Acceptance criteria
+
+For my work I need to access production servers. Most of them don't
+allow direct SSH access and I need to go through a bastion server.
+
+There are also two keys: a "lab" key and a "production" key. The SSH
+config ensures the right key is used.
+
+## Bastion access
+
+This scenario ensures I can access the bastion host directly.
+
+~~~scenario
+when I run ssh bast hostname
+then the output matches /^bast\d+$/
+~~~
+
+## Deployment server access
+ 
+This scenario ensures I can access the deployment host for running the
+train.
+
+~~~scenario
+when I run ssh deploy1001.eqiad.wmnet hostname
+then the output matches /^deploy\d+$/
+~~~
diff --git a/ssh-config.py b/ssh-config.py
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+import os
+import re
+import subprocess
+
+def run_ssh(ctx, host=None, cmd=None):
+    _runcmd(ctx, ['ssh', host, cmd])
+    if ctx.get('exit') != 0:
+        print('context:', ctx.as_dict())
+    assert_eq(ctx.get('exit'), 0)
+
+def stdout_matches(ctx, regex):
+    stdout = ctx.get('stdout', '')
+    assert_ne(re.search(regex, stdout), None)
+
+def _runcmd(ctx, argv):
+    p = subprocess.Popen(argv, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    stdout, stderr = p.communicate("")
+    ctx['argv'] = argv
+    ctx['stdout'] = stdout.decode('utf-8')
+    ctx['stderr'] = stderr.decode('utf-8')
+    ctx['exit'] = p.returncode
diff --git a/ssh-config.yaml b/ssh-config.yaml
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+- when: I run ssh (?P<host>\S+) (?P<cmd>.+)
+  function: run_ssh
+
+- then: the output matches /(?P<regex>.+)/
+  function: stdout_matches