source: package_tags/sipb-xen-www/3.11/code/getafsgroups.py @ 2758

Last change on this file since 2758 was 413, checked in by ecprice, 16 years ago

Resolve #69, by checking that administrators are either users or
groups in the athena cell.

File size: 3.6 KB
Line 
1#!/usr/bin/python
2import pprint
3import subprocess
4
5# import ldap
6# l = ldap.open("W92-130-LDAP-2.mit.edu")
7# # ldap.mit.edu is 1/2 broken right now so we're going to the working backend
8# l.simple_bind_s("", "")
9
10# def getLdapGroups(user):
11#     """
12#     getLdapGroups(user): returns a generator for the list of LDAP groups containing user
13#     """
14#     for user_data in l.search_s("ou=affiliates,dc=mit,dc=edu", ldap.SCOPE_ONELEVEL, "uid=" + user, []):
15#         for group_data in l.search_s("ou=groups,dc=mit,dc=edu", ldap.SCOPE_ONELEVEL, "uniqueMember="+user_data[0], ['cn']):
16#             yield group_data[1]['cn'][0]
17
18# def checkLdapGroups(user, group):
19#     """
20#     checkLdapGroups(user, group): returns True if and only if user is in LDAP group group
21#     """
22#     for result_data in l.search_s("ou=affiliates,dc=mit,dc=edu", ldap.SCOPE_ONELEVEL, "uid=" + user, []):
23#         if l.search_s("ou=groups,dc=mit,dc=edu", ldap.SCOPE_ONELEVEL, "(&(cn=" + group + ")(uniqueMember="+result_data[0] + "))", []) != []:
24#             return True
25#     return False
26
27class AfsProcessError(Exception):
28    pass
29
30def getAfsGroupMembers(group, cell):
31    p = subprocess.Popen(["pts", "membership", "-noauth", group, '-c', cell], 
32                         stdout=subprocess.PIPE, stderr=subprocess.PIPE)
33    err = p.stderr.read()
34    if err: #Error code doesn't reveal missing groups, but stderr does
35        raise AfsProcessError(err)
36    return [line.strip() for line in p.stdout.readlines()[1:]]
37
38def getLockerPath(locker):
39    if '/' in locker or locker in ['.', '..']:
40        raise AfsProcessError("Locker '%s' is invalid." % locker)
41    return '/mit/' + locker
42
43def getCell(locker):
44    p = subprocess.Popen(["fs", "whichcell", getLockerPath(locker)], 
45                         stdout=subprocess.PIPE, stderr=subprocess.PIPE)
46    if p.wait():
47        raise AfsProcessError(p.stderr.read())
48    return p.stdout.read().split()[-1][1:-1]
49
50def getLockerAcl(locker):
51    p = subprocess.Popen(["fs", "listacl", getLockerPath(locker)], 
52                         stdout=subprocess.PIPE, stderr=subprocess.PIPE)
53    if p.wait():
54        raise AfsProcessError(p.stderr.read())
55    lines = p.stdout.readlines()
56    values = []
57    for line in lines[1:]:
58        fields = line.split()
59        if fields[0] == 'Negative':
60            break
61        if 'a' in fields[1]:
62            values.append(fields[0])
63    return values
64
65def notLockerOwner(user, locker):
66    """
67    notLockerOwner(user, locker) returns false if and only if user administers locker.
68
69    If the user does not own the locker, returns the string reason for
70    the failure.
71    """
72    try:
73        cell = getCell(locker)
74        values = getLockerAcl(locker)
75    except AfsProcessError, e:
76        return str(e)
77
78    for entry in values:
79        if entry == user or (entry[0:6] == "system" and
80                                user in getAfsGroupMembers(entry, cell)):
81            return False
82    return "You don't have admin bits on " + getLockerPath(locker)
83
84
85if __name__ == "__main__":
86#    print list(getldapgroups("tabbott"))
87    print "tabbott" in getAfsGroupMembers("system:debathena", 'athena.mit.edu')
88    print "tabbott" in getAfsGroupMembers("system:debathena", 'sipb.mit.edu')
89    print "tabbott" in getAfsGroupMembers("system:debathena-root", 'athena.mit.edu')
90    print "tabbott" in getAfsGroupMembers("system:hmmt-request", 'athena.mit.edu')
91    print notLockerOwner("tabbott", "tabbott")
92    print notLockerOwner("tabbott", "debathena")
93    print notLockerOwner("tabbott", "sipb")
94    print notLockerOwner("tabbott", "lsc")
95    print notLockerOwner("tabbott", "scripts")
96    print notLockerOwner("ecprice", "hmmt")
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