X-Git-Url: http://xvm.mit.edu/gitweb/invirt/packages/invirt-web.git/blobdiff_plain/e37dd15bbf8683bab8454ea0eec8e9968ce982b2..b22b86d9a31ed73886db8b4862ff543c7507c6ce:/code/getafsgroups.py

diff --git a/code/getafsgroups.py b/code/getafsgroups.py
index 899de81..4e4b383 100644
--- a/code/getafsgroups.py
+++ b/code/getafsgroups.py
@@ -24,41 +24,43 @@ import subprocess
 #             return True
 #     return False
 
-class MyException(Exception):
+class AfsProcessError(Exception):
     pass
 
 def getAfsGroupMembers(group, cell):
-    p = subprocess.Popen(["pts", "membership", group, '-c', cell], 
+    p = subprocess.Popen(["pts", "membership", "-encrypt", group, '-c', cell],
                          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-    if p.wait():
-        return []
+    err = p.stderr.read()
+    if err: #Error code doesn't reveal missing groups, but stderr does
+        if err.startswith('pts: Permission denied ; unable to get membership of '):
+            return []
+        raise AfsProcessError(err)
     return [line.strip() for line in p.stdout.readlines()[1:]]
 
-def checkAfsGroup(user, group, cell):
-    """
-    checkAfsGroup(user, group) returns True if and only if user is in AFS group group in cell cell
-    """
-    return user in getAfsGroupMembers(group, cell)
+def getLockerPath(locker):
+    if '/' in locker or locker in ['.', '..']:
+        raise AfsProcessError("Locker '%s' is invalid." % locker)
+    return '/mit/' + locker
 
 def getCell(locker):
-    p = subprocess.Popen(["fs", "whichcell", "/mit/" + locker], 
+    p = subprocess.Popen(["fs", "whichcell", getLockerPath(locker)], 
                          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     if p.wait():
-        raise MyException(p.stderr.read())
+        raise AfsProcessError(p.stderr.read())
     return p.stdout.read().split()[-1][1:-1]
 
 def getLockerAcl(locker):
-    p = subprocess.Popen(["fs", "listacl", "/mit/" + locker], 
+    p = subprocess.Popen(["fs", "listacl", getLockerPath(locker)], 
                          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
     if p.wait():
-        raise MyException(p.stderr.read())
+        raise AfsProcessError(p.stderr.read())
     lines = p.stdout.readlines()
     values = []
     for line in lines[1:]:
         fields = line.split()
         if fields[0] == 'Negative':
             break
-        if 'rlidwka' in fields[1]:
+        if 'a' in fields[1]:
             values.append(fields[0])
     return values
 
@@ -72,22 +74,22 @@ def notLockerOwner(user, locker):
     try:
         cell = getCell(locker)
         values = getLockerAcl(locker)
-    except MyException, e:
+    except AfsProcessError, e:
         return str(e)
 
     for entry in values:
-        if entry == user or (entry[0:6] == "system" and 
-                                checkAfsGroup(user, entry, cell)):
+        if entry == user or (entry[0:6] == "system" and
+                                user in getAfsGroupMembers(entry, cell)):
             return False
-    return "You don't have admin bits on /mit/" + locker
+    return "You don't have admin bits on " + getLockerPath(locker)
 
 
 if __name__ == "__main__":
 #    print list(getldapgroups("tabbott"))
-    print checkAfsGroup("tabbott", "system:debathena", 'athena.mit.edu')
-    print checkAfsGroup("tabbott", "system:debathena", 'sipb.mit.edu')
-    print checkAfsGroup("tabbott", "system:debathena-root", 'athena.mit.edu')
-    print checkAfsGroup("tabbott", "system:hmmt-request", 'athena.mit.edu')
+    print "tabbott" in getAfsGroupMembers("system:debathena", 'athena.mit.edu')
+    print "tabbott" in getAfsGroupMembers("system:debathena", 'sipb.mit.edu')
+    print "tabbott" in getAfsGroupMembers("system:debathena-root", 'athena.mit.edu')
+    print "tabbott" in getAfsGroupMembers("system:hmmt-request", 'athena.mit.edu')
     print notLockerOwner("tabbott", "tabbott")
     print notLockerOwner("tabbott", "debathena")
     print notLockerOwner("tabbott", "sipb")