src/hg-ssh
author Paul Crowley <paul@lshift.net>
Thu, 15 Oct 2009 10:31:49 +0100
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child 165 3606d60b07e5
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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, os.path
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import base64
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from mercurialserver import ruleset, paths
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def fail(message):
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    sys.stderr.write("mercurial-server: %s\n" % message)
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    sys.exit(-1)
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def checkDots(path):
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    head, tail = os.path.split(path)
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    if tail.startswith("."):
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        fail("paths cannot contain dot file components")
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    if head:
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        checkDots(head)
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def checkParents(path):
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    path = os.path.dirname(path)
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    if path == "":
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        return
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    if os.path.exists(path + "/.hg"):
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        fail("Cannot create repo under existing repo")
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    checkParents(path)
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def getrepo(op, repo):
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    # First canonicalise, then check the string, then the rules
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    # and finally the filesystem.
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    repo = repo.rstrip("/")
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    if len(repo) == 0:
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        fail("path to repository seems to be empty")
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    if repo.startswith("/"):
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        fail("absolute paths are not supported")
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    checkDots(repo)
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    ruleset.rules.set(repo=repo)
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    if not ruleset.rules.allow(op, branch=None, file=None):
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        fail("access denied")
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    checkParents(repo)
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    return repo
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paths.setExePath()
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if len(sys.argv) == 3 and sys.argv[1] == "--base64":
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    ruleset.rules.set(user = base64.b64decode(sys.argv[2]))
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elif len(sys.argv) == 2:
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    ruleset.rules.set(user = sys.argv[1])
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else:
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    fail("hg-ssh wrongly called, is authorized_keys corrupt? (%s)" 
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        % sys.argv)
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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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for f in [
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    paths.getEtcPath() + "/access.conf", 
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    os.getcwd() + "/hgadmin/access.conf"]:
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    if os.path.isfile(f):
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        ruleset.rules.readfile(f)
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cmd = os.environ.get('SSH_ORIGINAL_COMMAND', None)
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if cmd is None:
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    fail("direct logins on the hg account prohibited")
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elif cmd.startswith('hg -R ') and cmd.endswith(' serve --stdio'):
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    repo = getrepo("read", cmd[6:-14])
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    if not os.path.isdir(repo + "/.hg"):
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        fail("no such repository %s" % repo)
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    dispatch.dispatch(['-R', repo, 'serve', '--stdio'])
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elif cmd.startswith('hg init '):
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    repo = getrepo("init", cmd[8:])
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    if os.path.exists(repo):
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        fail("%s exists" % repo)
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    d = os.path.dirname(repo)
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    if d != "" and not os.path.isdir(d):
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        os.makedirs(d)
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    dispatch.dispatch(['init', repo])
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else:
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    fail("illegal command %r" % cmd)
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