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# acl.py - changeset access control for mercurial
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#
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# Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com>
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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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# this hook allows to allow or deny access to parts of a repo when
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# taking incoming changesets.
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#
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# authorization is against local user name on system where hook is
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# run, not committer of original changeset (since that is easy to
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# spoof).
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#
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# acl hook is best to use if you use hgsh to set up restricted shells
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# for authenticated users to only push to / pull from. not safe if
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# user has interactive shell access, because they can disable hook.
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# also not safe if remote users share one local account, because then
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# no way to tell remote users apart.
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#
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# to use, configure acl extension in hgrc like this:
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#
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# [extensions]
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# hgext.acl =
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#
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# [hooks]
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# pretxnchangegroup.acl = python:hgext.acl.hook
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#
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# [acl]
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# sources = serve # check if source of incoming changes in this list
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# # ("serve" == ssh or http, "push", "pull", "bundle")
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#
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# allow and deny lists have subtree pattern (default syntax is glob)
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# on left, user names on right. deny list checked before allow list.
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#
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# [acl.allow]
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# # if acl.allow not present, all users allowed by default
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# # empty acl.allow = no users allowed
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# docs/** = doc_writer
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# .hgtags = release_engineer
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#
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# [acl.deny]
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# # if acl.deny not present, no users denied by default
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# # empty acl.deny = all users allowed
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# glob pattern = user4, user5
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# ** = user6
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from mercurial.i18n import _
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from mercurial.node import bin, short
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from mercurial import util
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import getpass
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class checker(object):
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'''acl checker.'''
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def buildmatch(self, key):
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'''return tuple of (match function, list enabled).'''
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if not self.ui.has_section(key):
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self.ui.debug(_('acl: %s not enabled\n') % key)
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return None, False
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thisuser = self.getuser()
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pats = [pat for pat, users in self.ui.configitems(key)
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if thisuser in users.replace(',', ' ').split()]
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self.ui.debug(_('acl: %s enabled, %d entries for user %s\n') %
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(key, len(pats), thisuser))
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if pats:
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match = util.matcher(self.repo.root, names=pats)[1]
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else:
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match = util.never
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return match, True
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def getuser(self):
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'''return name of authenticated user.'''
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return self.user
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def __init__(self, ui, repo):
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self.ui = ui
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self.repo = repo
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self.user = getpass.getuser()
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cfg = self.ui.config('acl', 'config')
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if cfg:
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self.ui.readsections(cfg, 'acl.allow', 'acl.deny')
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self.allow, self.allowable = self.buildmatch('acl.allow')
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self.deny, self.deniable = self.buildmatch('acl.deny')
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def skipsource(self, source):
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'''true if incoming changes from this source should be skipped.'''
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ok_sources = self.ui.config('acl', 'sources', 'serve').split()
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return source not in ok_sources
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def check(self, node):
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'''return if access allowed, raise exception if not.'''
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files = self.repo.changectx(node).files()
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if self.deniable:
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for f in files:
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if self.deny(f):
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self.ui.debug(_('acl: user %s denied on %s\n') %
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(self.getuser(), f))
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raise util.Abort(_('acl: access denied for changeset %s') %
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short(node))
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if self.allowable:
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for f in files:
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if not self.allow(f):
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self.ui.debug(_('acl: user %s not allowed on %s\n') %
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(self.getuser(), f))
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raise util.Abort(_('acl: access denied for changeset %s') %
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short(node))
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self.ui.debug(_('acl: allowing changeset %s\n') % short(node))
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def hook(ui, repo, hooktype, node=None, source=None, **kwargs):
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if hooktype != 'pretxnchangegroup':
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raise util.Abort(_('config error - hook type "%s" cannot stop '
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'incoming changesets') % hooktype)
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c = checker(ui, repo)
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if c.skipsource(source):
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ui.debug(_('acl: changes have source "%s" - skipping\n') % source)
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return
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start = repo.changelog.rev(bin(node))
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end = repo.changelog.count()
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for rev in xrange(start, end):
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c.check(repo.changelog.node(rev))
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