#!/usr/bin/env python
# -*- mode: python -*-
# Generates passwd, shadow and group files from the ldap directory.

import string, re, time, ldap, getopt, sys, os, posix, pwd;
from userdir_ldap import *;

PasswdAttrs = None;
GroupIDMap = {};

# See if this user is in the group list
def IsInGroup(DnRecord,Allowed):
  # See if the primary group is in the list
  if Allowed.has_key(GetAttr(DnRecord,"gidnumber")) != 0:
     return 1;

  # See if there are supplementary groups
  if DnRecord[1].has_key("supplementarygid") == 0:
     return 0;

  # Check the supplementary groups
  for I in DnRecord[1]["supplementarygid"]:
     if Allowed.has_key(I):
        return 1;
  return 0;

def Die(F,Fdb):
   if F != None:
      F.close();
   if Fdb != None:
      Fdb.close();
   try: os.remove(File + ".tmp");
   except: pass;
   try: os.remove(File + ".tdb.tmp");
   except: pass;

def Done(File,F,Fdb):
  if F != None:
    F.close();
    os.rename(File + ".tmp",File);
  if Fdb != None:
    Fdb.close();
    os.rename(File + ".tdb.tmp",File+".tdb");
  
# Generate the password list
def GenPasswd(l,File,HomePrefix,Allowed):
  F = None;
  Fdb = None;
  try:
   F = open(File + ".tmp","w");
   Fdb = open(File + ".tdb.tmp","w");

   # Fetch all the users
   global PasswdAttrs;
   if PasswdAttrs == None:
      raise "No Users";

   I = 0;
   for x in PasswdAttrs:
      if x[1].has_key("uidnumber") == 0 or IsInGroup(x,Allowed) == 0:
         continue;
	    
      Line = "%s:x:%s:%s:%s:%s%s:%s\n" % (GetAttr(x,"uid"),\
              GetAttr(x,"uidnumber"),GetAttr(x,"gidnumber"),\
              GetAttr(x,"gecos"),HomePrefix,GetAttr(x,"uid"),\
              GetAttr(x,"loginshell"));
      F.write(Line);
      Fdb.write("0%u %s" % (I,Line));
      Fdb.write(".%s %s" % (GetAttr(x,"uid"),Line));
      Fdb.write("=%s %s" % (GetAttr(x,"uidnumber"),Line));
      I = I + 1;

  # Oops, something unspeakable happened.
  except:
   Die(F,Fdb);
   raise;
  Done(File,F,Fdb);

# Generate the shadow list
def GenShadow(l,File,Allowed):
  F = None;
  Fdb = None;
  try:
   OldMask = os.umask(0077);
   F = open(File + ".tmp","w",0600);
   Fdb = open(File + ".tdb.tmp","w",0600);
   os.umask(OldMask);

   # Fetch all the users
   global PasswdAttrs;
   if PasswdAttrs == None:
      raise "No Users";

   I = 0;
   for x in PasswdAttrs:
      if x[1].has_key("uidnumber") == 0 or IsInGroup(x,Allowed) == 0:
         continue;
	 
      Pass = GetAttr(x,"userpassword");
      if Pass[0:7] != "{crypt}":
         Pass = '*';
      else:
         Pass = Pass[7:];
      Line = "%s:%s:%s:%s:%s:%s:%s:%s:\n" % (GetAttr(x,"uid"),\
              Pass,GetAttr(x,"shadowlastchange"),\
              GetAttr(x,"shadowmin"),GetAttr(x,"shadowmax"),\
              GetAttr(x,"shadowwarning"),GetAttr(x,"shadowinactive"),\
              GetAttr(x,"shadowexpire"));
      F.write(Line);
      Fdb.write("0%u %s" % (I,Line));
      Fdb.write(".%s %s" % (GetAttr(x,"uid"),Line));
      I = I + 1;

  # Oops, something unspeakable happened.
  except:
   Die(F,Fdb);
   raise;
  Done(File,F,Fdb);

# Generate the group list
def GenGroup(l,File,Allowed):
  F = None;
  Fdb = None;
  try:
   F = open(File + ".tmp","w");
   Fdb = open(File + ".tdb.tmp","w");

   # Generate the GroupMap
   GroupMap = {};
   for x in GroupIDMap.keys():
      GroupMap[x] = [];
      
   # Fetch all the users
   global PasswdAttrs;
   if PasswdAttrs == None:
      raise "No Users";

   # Sort them into a list of groups having a set of users
   for x in PasswdAttrs:
      if x[1].has_key("uidnumber") == 0 or IsInGroup(x,Allowed) == 0:
         continue;
      if x[1].has_key("supplementarygid") == 0:
         continue;
	 
      for I in x[1]["supplementarygid"]:
         if GroupMap.has_key(I):
	    GroupMap[I].append(GetAttr(x,"uid"));
	 else:
	    GroupMap[I] = [GetAttr(x,"uid")];
	    
   # Output the group file.
   Counter = 0; 
   for x in GroupMap.keys():
      Line = "%s:x:%u:" % (x,GroupIDMap[x]);
      Comma = '';
      for I in GroupMap[x]:
        Line = Line + ("%s%s" % (Comma,I));
        Comma = ',';
      Line = Line + '\n';
      F.write(Line);
      Fdb.write("0%u %s" % (Counter,Line));
      Fdb.write(".%s %s" % (x,Line));
      Fdb.write("=%u %s" % (GroupIDMap[x],Line));
      Counter = Counter + 1;
      
  # Oops, something unspeakable happened.
  except:
   Die(F,Fdb);
   raise;
  Done(File,F,Fdb);

# Generate the email forwarding list
def GenForward(l,File,Allowed):
  F = None;
  Fdb = None;
  try:
   F = open(File + ".tmp","w");
   Fdb = None;

   # Fetch all the users
   global PasswdAttrs;
   if PasswdAttrs == None:
      raise "No Users";

   # Write out the email address for each user
   for x in PasswdAttrs:
      if x[1].has_key("emailforward") == 0 or IsInGroup(x,Allowed) == 0:
         continue;
      Line = "%s: %s\n" % (GetAttr(x,"uid"),GetAttr(x,"emailforward"));
      F.write(Line);
      
  # Oops, something unspeakable happened.
  except:
   Die(F,Fdb);
   raise;
  Done(File,F,Fdb);

# Connect to the ldap server
l = ldap.open(LDAPServer);
F = open(PassDir+"/pass-"+pwd.getpwuid(posix.getuid())[0],"r");
Pass = string.split(string.strip(F.readline())," ");
F.close();
l.simple_bind_s("uid="+Pass[0]+","+BaseDn,Pass[1]);

# Fetch all the groups
GroupIDMap = {};
Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"gid=*",\
                  ["gid","gidnumber"]);

# Generate the GroupMap and GroupIDMap
for x in Attrs:
   if x[1].has_key("gidnumber") == 0:
      continue;
   GroupIDMap[x[1]["gid"][0]] = int(x[1]["gidnumber"][0]);

# Fetch all the users
PasswdAttrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid=*",\
                ["uid","uidnumber","gidnumber","supplementarygid",\
                 "gecos","loginshell","userpassword","shadowlastchange",\
                 "shadowmin","shadowmax","shadowwarning","shadowinactive",
	         "shadowexpire","emailforward"]);

# Open the control file
if len(sys.argv) == 1:
   F = open(GenerateConf,"r");
else:
   F = open(sys.argv[1],"r")
while(1):
   Line = F.readline();
   if Line == "":
      break;
   Line = string.strip(Line);
   if Line == "":
      continue;
   if Line[0] == '#':
      continue;

   Split = string.split(Line," ");
   OutDir = GenerateDir + '/' + Split[0] + '/';
   try: os.mkdir(OutDir);
   except: pass;

   # Get the group list and convert any named groups to numerics
   GroupList = {};
   for I in Split[2:]:
      GroupList[I] = None;
      if GroupIDMap.has_key(I):
         GroupList[str(GroupIDMap[I])] = None;

   GenPasswd(l,OutDir+"passwd",Split[1],GroupList);
   GenGroup(l,OutDir+"group",GroupList);
   GenShadow(l,OutDir+"shadow",GroupList);
   GenForward(l,OutDir+"forward-alias",GroupList);