src/hg-ssh
author Paul Crowley <paul@lshift.net>
Fri, 06 Mar 2009 12:46:22 +0000 (2009-03-06)
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#!/usr/bin/env python
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#
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# Copyright 2008-2009 LShift Ltd
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# Copyright 2005-2007 by Intevation GmbH <intevation@intevation.de>
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# Authors:
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# Paul Crowley <paul@lshift.net>
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# Thomas Arendsen Hein <thomas@intevation.de>
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# with ideas from  Mathieu PASQUET <kiorky@cryptelium.net>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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"""
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hg-ssh - limit access to hg repositories reached via ssh.  Part of
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mercurial-server.
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This script is called by hg-ssh-wrapper with no arguments - everything
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should be in enviroment variables:
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HG_ACCESS_RULES_PATH identifies the paths to the rule files
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REMOTE_USER the remote user (which is the key used by ssh)
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SSH_ORIGINAL_COMMAND the command the user was trying to run
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It uses SSH_ORIGINAL_COMMAND to determine what the user was trying to
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do and to what repository, and then checks each rule in the rule file
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in turn for a matching rule which decides what to do, defaulting to
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disallowing the action.
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"""
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# enable importing on demand to reduce startup time
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from mercurial import demandimport; demandimport.enable()
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from mercurial import dispatch
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import sys, os
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from mercurialserver import ruleset, paths
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def fail(message):
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    #logfile.write("Fail: %s\n" % message)
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    sys.stderr.write(message + "\n")
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    sys.exit(-1)
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def getpath(path):
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    if path.endswith("/"):
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        path = path[:-1]
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    if not ruleset.goodpath(path):
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        fail("Disallowing path: %s" % path)
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    return path
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def try_cmd(rules, cmd):
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    if cmd.startswith('hg -R ') and cmd.endswith(' serve --stdio'):
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        repo = getpath(cmd[6:-14])
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        if rules.allow("read", repo=repo):
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            os.environ["HG_REPO_PATH"] = repo
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            dispatch.dispatch(['-R', repo, 'serve', '--stdio'])
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            return
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    elif cmd.startswith('hg init '):
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        repo = getpath(cmd[8:])
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        if rules.allow("init", repo=repo):
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            os.environ["HG_REPO_PATH"] = repo
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            dispatch.dispatch(['init', repo])
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            return
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    fail("Illegal command %r" % cmd)
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#logfile = open("/tmp/hg-ssh.%d.txt" % os.getpid(), "w")
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#logfile.write("Started: %s\n" % sys.argv)
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if len(sys.argv) != 2:
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    fail("hg-ssh must have exactly one argument (%s)" 
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        % sys.argv)
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remote_user = sys.argv[1]
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os.environ['REMOTE_USER'] = remote_user
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# Use a different hgrc for remote pulls - this way you can set
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# up access.py for everything at once without affecting local operations
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os.environ['HGRCPATH'] = paths.getEtcPath() + "/remote-hgrc"
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os.chdir('repos')
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os.environ['HG_ACCESS_RULES_PATH'] = (
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    paths.getEtcPath() + "/access.conf" + ":" + 
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    os.getcwd() + "/hgadmin/access.conf")
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rules = ruleset.rules_from_env()
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rules.set(user = getpath(remote_user))
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rules.set(branch = None, file = None)
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try_cmd(rules, os.environ.get('SSH_ORIGINAL_COMMAND', '?'))