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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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# Allows creation of users. This sets up the following:
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# * User's jail and home directory within the jail.
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# * Subversion repository (TODO)
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# * Check out Subversion workspace into jail (TODO)
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# * Database details for user
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# TODO: Sanitize login name and other fields.
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# Users must not be called "temp" or "template".
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# TODO: When creating a new home directory, chown it to its owner
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# TODO: In chown_to_webserver:
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# Do not call os.system("chown www-data") - use Python lib
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# and use the web server uid given in conf. (Several places).
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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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import ivle.pulldown_subj
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from ivle.database import ProjectGroup
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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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Chowns a file so the web server user owns it.
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(This is useful in setting up Subversion conf files).
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subprocess.call(['chown', '-R', 'www-data:www-data', filename])
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os.system("chown -R www-data:www-data %s" % 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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"""Create a Subversion repository at the given path.
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res = subprocess.call(['svnadmin', 'create', path])
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res = os.system("svnadmin create '%s'" % 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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def rebuild_svn_config(store):
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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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users = store.find(ivle.database.User)
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# TODO: Populate groups with per-offering tutors/lecturers/etc.
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f = open(ivle.conf.svn_conf + ".new", "w")
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f.write("# IVLE SVN Repositories Configuration\n")
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f.write("# Auto-generated on %s\n" % time.asctime())
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for (g,ls) in groups.iteritems():
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f.write("%s = %s\n" % (g, ",".join(ls)))
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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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f.write("[%s:/]\n" % u.login)
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f.write("%s = rw\n" % u.login)
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#f.write("@tutor = r\n")
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#f.write("@lecturer = rw\n")
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#f.write("@admin = rw\n")
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os.rename(temp_name, conf_name)
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chown_to_webserver(conf_name)
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os.rename(ivle.conf.svn_conf + ".new", ivle.conf.svn_conf)
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chown_to_webserver(ivle.conf.svn_conf)
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def rebuild_svn_group_config(store, config):
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def rebuild_svn_group_config(store):
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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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f = open(ivle.conf.svn_group_conf + ".new", "w")
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f.write("# IVLE SVN Group Repositories Configuration\n")
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f.write("# Auto-generated on %s\n" % time.asctime())
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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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f.write("[%s:/]\n"%reponame)
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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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os.rename(ivle.conf.svn_group_conf + ".new", ivle.conf.svn_group_conf)
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chown_to_webserver(ivle.conf.svn_group_conf)
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def make_svn_auth(store, login, throw_on_error=True):
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"""Setup svn authentication for the given user.
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Uses the given DB store object. Does not commit to the db.
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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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passwd = md5.new(uuid.uuid4().bytes).digest().encode('hex')
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if os.path.exists(ivle.conf.svn_auth_ivle):
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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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user = ivle.database.User.get_by_login(store, login)
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user.svn_pass = unicode(passwd)
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res = os.system("htpasswd -%smb %s %s %s" % (create,
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ivle.conf.svn_auth_ivle,
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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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if create == "c":
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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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chown_to_webserver(ivle.conf.svn_auth_ivle)
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def generate_manifest(basedir, targetdir, parent=''):
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""" From a basedir and a targetdir work out which files are missing or out
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of date and need to be added/updated and which files are redundant and need
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parent: This is used for the recursive call to track the relative paths
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that we have decended.
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cmp = filecmp.dircmp(basedir, targetdir)
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# Add all new files and files that have changed
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to_add = [os.path.join(parent,x) for x in (cmp.left_only + cmp.diff_files)]
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# Remove files that are redundant
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to_remove = [os.path.join(parent,x) for x in cmp.right_only]
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for d in cmp.common_dirs:
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newbasedir = os.path.join(basedir, d)
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newtargetdir = os.path.join(targetdir, d)
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newparent = os.path.join(parent, d)
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(sadd,sremove) = generate_manifest(newbasedir, newtargetdir, newparent)
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return (to_add, to_remove)
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def make_jail(user, force=True):
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"""Creates a new user's jail space, in the jail directory as configured in
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This only creates things within /home - everything else is expected to be
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part of another UnionFS 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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force: If false, exception if jail already exists for this user.
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If true (default), overwrites it, but preserves home directory.
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# MUST run as root or some of this may fail
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if os.getuid() != 0:
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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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tempdir = os.path.join(ivle.conf.jail_src_base, '__temp__')
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if not os.path.exists(tempdir):
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os.makedirs(tempdir)
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elif not os.path.isdir(tempdir):
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os.unlink(tempdir)
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os.mkdir(tempdir)
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userdir = os.path.join(jail_src_base, user.login)
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userdir = os.path.join(ivle.conf.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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# 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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make_conf_py(user.login, userdir, user.svn_pass)
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make_etc_passwd(user.login, userdir, ivle.conf.jail_system, user.unixid)
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return userhomedir
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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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def make_conf_py(username, user_jail_dir, svn_pass):
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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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file ${python_site_packages}/ivle/conf/conf.py in a given user's jail.
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user_jail_dir: User's jail dir, ie. ivle.conf.jail_base + username
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svn_pass: User's SVN password.
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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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conf_path = os.path.join(user_jail_dir,
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ivle.conf.python_site_packages[1:], "ivle/conf/conf.py")
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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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# So we just write root_dir, and jail_base is "/".
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# (jail_base being "/" means "jail-relative" paths are relative to "/"
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# when inside the jail.)
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# XXX: jail_base is wrong and shouldn't be here. Unfortunately, jail code
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# uses ivle.studpath.url_to_{local,jailpaths}, both of which use
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# jail_base. Note that they don't use the bits of the return value
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# that depend on jail_base, so it can be any string.
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conf_file = open(conf_path, "w")
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conf_file.write("""# IVLE jail configuration
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# In URL space, where in the site is IVLE located. (All URLs will be prefixed
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# eg. "/" or "/ivle".
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root_dir = %(root_dir)r
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# This value is not relevant inside the jail, but must remain for now. See
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# the XXX in ivle.makeuser.make_conf_py.
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# The hostname for serving publicly accessible pages
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public_host = %(public_host)r
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# The URL under which the Subversion repositories are located.
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svn_addr = %(svn_addr)r
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# The login name for the owner of the jail
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# The subversion-only password for the owner of the jail
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svn_pass = %(svn_pass)r
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""" % {'root_dir': ivle.conf.root_dir,
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'public_host': ivle.conf.public_host,
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'svn_addr': ivle.conf.svn_addr,
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'username': username,
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'svn_pass': svn_pass,
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# Make this file world-readable
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# (chmod 644 conf_path)
added
removed
ivle/makeuser.py
