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# IVLE - Informatics Virtual Learning Environment
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# Copyright (C) 2007-2009 The University of Melbourne
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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"""User and group filesystem management helpers."""
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from storm.expr import Select, Max
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from ivle.database import (User, ProjectGroup, Assessed, ProjectSubmission,
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Project, ProjectSet, Offering, Enrolment, Subject, Semester)
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def chown_to_webserver(filename):
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"""chown a directory and its contents to the web server.
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Recursively chowns a file or directory so the web server user owns it.
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subprocess.call(['chown', '-R', 'www-data:www-data', filename])
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def make_svn_repo(path, throw_on_error=True):
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"""Create a Subversion repository at the given path."""
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res = subprocess.call(['svnadmin', 'create', path])
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if res != 0 and throw_on_error:
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raise Exception("Cannot create repository: %s" % path)
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except Exception, exc:
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chown_to_webserver(path)
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def rebuild_svn_config(store, config):
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"""Build the complete SVN configuration file.
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@param config: An ivle.config.Config object.
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users = store.find(User)
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conf_name = config['paths']['svn']['conf']
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temp_name = conf_name + ".new"
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f = open(temp_name, "w")
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# IVLE SVN repository authorisation configuration
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""" % {'time': time.asctime()})
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""" % {'login': u.login})
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# Now we need to grant offering tutors and lecturers access to the latest
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# submissions in their offerings. There are much prettier ways to do this,
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# but a lot of browser requests call this function, so it needs to be
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# fast. We can grab all of the paths needing authorisation directives with
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# a single query, and we cache the list of viewers for each offering.
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offering_viewers_cache = {}
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for (login, psid, pspath, offeringid) in store.find(
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(User.login, ProjectSubmission.id, ProjectSubmission.path,
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Assessed.id == ProjectSubmission.assessed_id,
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User.id == Assessed.user_id,
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Project.id == Assessed.project_id,
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ProjectSet.id == Project.project_set_id,
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Offering.id == ProjectSet.id,
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ProjectSubmission.date_submitted == Select(
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Max(ProjectSubmission.date_submitted),
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ProjectSubmission.assessed_id == Assessed.id,
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tables=ProjectSubmission
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# Do we already have the list of logins authorised for this offering
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# cached? If not, get it.
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if offeringid not in offering_viewers_cache:
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offering_viewers_cache[offeringid] = list(store.find(
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User.id == Enrolment.user_id,
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Enrolment.offering_id == offeringid,
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Enrolment.role.is_in((u'tutor', u'lecturer'))
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""" % {'login': login, 'id': psid, 'path': pspath})
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for viewer_login in offering_viewers_cache[offeringid]:
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# We don't want to override the owner's write privilege,
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# so we don't add them to the read-only ACL.
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if login != viewer_login:
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f.write("%s = r\n" % viewer_login)
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os.rename(temp_name, conf_name)
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chown_to_webserver(conf_name)
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def rebuild_svn_group_config(store, config):
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"""Build the complete SVN configuration file for groups
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@param config: An ivle.config.Config object.
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conf_name = config['paths']['svn']['group_conf']
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temp_name = conf_name + ".new"
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f = open(temp_name, "w")
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# IVLE SVN group repository authorisation configuration
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# Generated: %(time)s
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""" % {'time': time.asctime()})
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group_members_cache = {}
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for group in store.find(ProjectGroup):
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offering = group.project_set.offering
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reponame = "_".join([offering.subject.short_name,
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offering.semester.year,
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offering.semester.semester,
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f.write("[%s:/]\n" % reponame)
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if group.id not in group_members_cache:
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group_members_cache[group.id] = set()
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for user in group.members:
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group_members_cache[group.id].add(user.login)
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f.write("%s = rw\n" % user.login)
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# Now we need to grant offering tutors and lecturers access to the latest
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# submissions in their offerings. There are much prettier ways to do this,
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# but a lot of browser requests call this function, so it needs to be
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# fast. We can grab all of the paths needing authorisation directives with
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# a single query, and we cache the list of viewers for each offering.
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offering_viewers_cache = {}
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for (ssn, year, sem, name, psid, pspath, gid, offeringid) in store.find(
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(Subject.short_name, Semester.year, Semester.semester,
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ProjectGroup.name, ProjectSubmission.id, ProjectSubmission.path,
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ProjectGroup.id, Offering.id),
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Assessed.id == ProjectSubmission.assessed_id,
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ProjectGroup.id == Assessed.project_group_id,
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Project.id == Assessed.project_id,
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ProjectSet.id == Project.project_set_id,
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Offering.id == ProjectSet.offering_id,
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Subject.id == Offering.subject_id,
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Semester.id == Offering.semester_id,
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ProjectSubmission.date_submitted == Select(
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Max(ProjectSubmission.date_submitted),
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ProjectSubmission.assessed_id == Assessed.id,
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tables=ProjectSubmission
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reponame = "_".join([ssn, year, sem, name])
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# Do we already have the list of logins authorised for this offering
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# cached? If not, get it.
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if offeringid not in offering_viewers_cache:
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offering_viewers_cache[offeringid] = list(store.find(
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User.id == Enrolment.user_id,
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Enrolment.offering_id == offeringid,
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Enrolment.role.is_in((u'tutor', u'lecturer'))
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""" % {'repo': reponame, 'id': psid, 'path': pspath})
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for viewer_login in offering_viewers_cache[offeringid]:
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# Skip existing group members, or they can't write to it any more.
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if viewer_login not in group_members_cache[gid]:
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f.write("%s = r\n" % viewer_login)
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os.rename(temp_name, conf_name)
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chown_to_webserver(conf_name)
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def make_svn_auth(store, login, config, throw_on_error=True):
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"""Create a Subversion password for a user.
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Generates a new random Subversion password, and assigns it to the user.
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The password is added to Apache's Subversion authentication file.
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# filename is, eg, /var/lib/ivle/svn/ivle.auth
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filename = config['paths']['svn']['auth_ivle']
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if os.path.exists(filename):
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user = User.get_by_login(store, login)
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if user.svn_pass is None:
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passwd = hashlib.md5(uuid.uuid4().bytes).hexdigest()
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user.svn_pass = unicode(passwd)
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res = subprocess.call(['htpasswd', '-%smb' % create,
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filename, login, user.svn_pass])
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if res != 0 and throw_on_error:
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raise Exception("Unable to create ivle-auth for %s" % login)
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# Make sure the file is owned by the web server
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chown_to_webserver(filename)
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def make_jail(user, config, force=True):
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"""Create or update a user's jail.
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Only the user-specific parts of the jail are created here - everything
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else is expected to be part of another aufs branch.
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Returns the path to the user's home directory.
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Chowns the user's directory within the jail to the given UID.
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@param force: If False, raise an exception if the user already has a jail.
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If True (default), rebuild the jail preserving /home.
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# MUST run as root or some of this may fail
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raise Exception("Must run make_jail as root")
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# tempdir is for putting backup homes in
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jail_src_base = config['paths']['jails']['src']
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tempdir = os.path.join(jail_src_base, '__temp__')
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if not os.path.exists(tempdir):
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elif not os.path.isdir(tempdir):
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userdir = os.path.join(jail_src_base, user.login)
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homedir = os.path.join(userdir, 'home')
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tmpdir = os.path.join(userdir, 'tmp')
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userhomedir = os.path.join(homedir, user.login) # Return value
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if os.path.exists(userdir):
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raise Exception("User's jail already exists")
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# User jail already exists. Blow it away but preserve their home
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# directory. It should be all that is there anyway, but you never
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# Ignore warnings about the use of tmpnam
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warnings.simplefilter('ignore')
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homebackup = os.tempnam(tempdir)
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warnings.resetwarnings()
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# Back up the /home directory, delete the entire jail, recreate the
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# jail directory tree, then copy the /home back
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# NOTE that shutil.move changed in Python 2.6, it now moves a
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# directory INTO the target (like `mv`), which it didn't use to do.
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# This code works regardless.
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shutil.move(userhomedir, homebackup)
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shutil.rmtree(userdir)
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shutil.move(homebackup, userhomedir)
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# Change the ownership of all the files to the right unixid
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logging.debug("chown %s's home directory files to uid %d"
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%(user.login, user.unixid))
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os.spawnvp(os.P_WAIT, 'chown', ['chown', '-R', '%d:%d' % (user.unixid,
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user.unixid), userhomedir])
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# No user jail exists
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# Set up the user's home directory
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os.makedirs(userhomedir)
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# Chown (and set the GID to the same as the UID).
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os.chown(userhomedir, user.unixid, user.unixid)
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# Chmod to rwxr-xr-x (755)
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os.chmod(userhomedir, 0755)
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make_ivle_conf(user.login, userdir, user.svn_pass, config)
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make_etc_passwd(user.login, userdir, config['paths']['jails']['template'],
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os.chmod(tmpdir, 01777)
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def make_ivle_conf(username, user_jail_dir, svn_pass, sys_config):
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"""Generate an ivle.conf for a user's jail.
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Creates (overwriting any existing file, and creating directories) a
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file /etc/ivle/ivle.conf in a given user's jail.
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@param username: Username.
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@param user_jail_dir: User's jail dir, ie. ['jails']['src'] + username
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@param svn_pass: User's SVN password.
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@param sys_config: An ivle.config.Config object (the system-wide config).
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conf_path = os.path.join(user_jail_dir, "home/.ivle.conf")
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if not os.path.exists(os.path.dirname(conf_path)):
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os.makedirs(os.path.dirname(conf_path))
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# In the "in-jail" version of conf, we don't need MOST of the details
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# (it would be a security risk to have them here).
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# So we just write root_dir.
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conf_obj = ivle.config.Config(blank=True)
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conf_obj.filename = conf_path
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conf_obj['urls']['root'] = sys_config['urls']['root']
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conf_obj['urls']['public_host'] = sys_config['urls']['public_host']
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conf_obj['urls']['svn_addr'] = sys_config['urls']['svn_addr']
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conf_obj['user_info']['login'] = username
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conf_obj['user_info']['svn_pass'] = svn_pass
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# Make this file world-readable
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# (chmod 644 conf_path)
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os.chmod(conf_path, stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP
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def make_etc_passwd(username, user_jail_dir, template_dir, unixid):
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"""Create a passwd file for a user's jail.
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Creates /etc/passwd in the given user's jail. This will be identical to
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that in the template jail, except for the added entry for this user.
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template_passwd_path = os.path.join(template_dir, "home/.passwd")
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passwd_path = os.path.join(user_jail_dir, "home/.passwd")
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passwd_dir = os.path.dirname(passwd_path)
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if not os.path.exists(passwd_dir):
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os.makedirs(passwd_dir)
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shutil.copy(template_passwd_path, passwd_path)
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passwd_file = open(passwd_path, 'a')
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passwd_file.write('%s:x:%d:%d::/home/%s:/bin/bash'
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% (username, unixid, unixid, username))
added
removed
ivle/makeuser.py
