#!/usr/bin/env python
# -*- mode: python -*-

#   Copyright (c) 1999-2000  Jason Gunthorpe <jgg@debian.org>
#   Copyright (c) 2001-2003  James Troup <troup@debian.org>
#   Copyright (c) 2004  Joey Schulze <joey@infodrom.org>
#   Copyright (c) 2008,2009,2010 Peter Palfrader <peter@palfrader.org>
#
#   This program is free software; you can redistribute it and/or modify
#   it under the terms of the GNU General Public License as published by
#   the Free Software Foundation; either version 2 of the License, or
#   (at your option) any later version.
#
#   This program is distributed in the hope that it will be useful,
#   but WITHOUT ANY WARRANTY; without even the implied warranty of
#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#   GNU General Public License for more details.
#
#   You should have received a copy of the GNU General Public License
#   along with this program; if not, write to the Free Software
#   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

import re, time, ldap, getopt, sys, os, pwd;
import email.Header
import datetime

from userdir_ldap import *;
from userdir_gpg import *;

HavePrivateList = getattr(ConfModule, "haveprivatelist", True)
DefaultGroup = getattr(ConfModule, "defaultgroup", 'users')

# This tries to search for a free UID. There are two possible ways to do
# this, one is to fetch all the entires and pick the highest, the other
# is to randomly guess uids until one is free. This uses the former.
# Regrettably ldap doesn't have an integer attribute comparision function
# so we can only cut the search down slightly

def ShouldIgnoreID(uid):
   for i in IgnoreUsersForUIDNumberGen:
      try:
         if i.search(uid) is not None:
            return True
      except AttributeError:
         if uid == i:
            return True

   return False

# [JT] This is broken with Woody LDAP and the Schema; for now just
#      search through all UIDs.
def GetFreeID(l):
   Attrs = l.search_s(BaseBaseDn,ldap.SCOPE_SUBTREE,
                      "(|(uidNumber=*)(gidNumber=*))",["uidNumber", "gidNumber", "uid"]);
   HighestUID = 0;
   gids = [];
   uids = [];
   for I in Attrs:
      ID = int(GetAttr(I,"uidNumber","0"));
      uids.append(ID)
      gids.append(int(GetAttr(I, "gidNumber","0")))
      uid = GetAttr(I, "uid", None)
      if ID > HighestUID and not uid is None and not ShouldIgnoreID(uid):
         HighestUID = ID;

   resUID = HighestUID + 1;
   while resUID in uids or resUID in gids:
      resUID += 1

   return (resUID, resUID)

# Main starts here
AdminUser = pwd.getpwuid(os.getuid())[0];

# Process options
ForceMail = 0;
NoAutomaticIDs = 0;
GuestAccount = False
OldGPGKeyRings = GPGKeyRings;
userdir_gpg.GPGKeyRings = [];
(options, arguments) = getopt.getopt(sys.argv[1:], "hgu:man")
for (switch, val) in options:
   if (switch == '-h'):
      print "Usage: ud-useradd <options>"
      print "Available options:"
      print "        -h         Show this help"
      print "        -u=<user>  Admin user (defaults to current username)"
      print "        -m         Force mail (for updates)"
      print "        -a         Use old keyrings instead (??)"
      print "        -n         Do not automatically assign UID/GIDs"
      print "        -g         Add a guest account"
      sys.exit(0)
   elif (switch == '-u'):
      AdminUser = val;
   elif (switch == '-m'):
      ForceMail = 1;
   elif (switch == '-a'):
      userdir_gpg.GPGKeyRings = OldGPGKeyRings;
   elif (switch == '-n'):
      NoAutomaticIDs = 1;
   elif (switch == '-g'):
      GuestAccount = True

l = passwdAccessLDAP(BaseDn, AdminUser)

# Locate the key of the user we are adding
if GuestAccount:
   SetKeyrings(ConfModule.add_keyrings_guest.split(":"))
else:
   SetKeyrings(ConfModule.add_keyrings.split(":"))

while (1):
   Foo = raw_input("Who are you going to add (for a GPG search)? ");
   if Foo == "":
      sys.exit(0);

   Keys = GPGKeySearch(Foo);

   if len(Keys) == 0:
      print "Sorry, that search did not turn up any keys."
      print "Has it been added to the Debian keyring already?"
      continue;
   if len(Keys) > 1:
      print "Sorry, more than one key was found, please specify the key to use by\nfingerprint:";
      for i in Keys:
         GPGPrintKeyInfo(i);
      continue;

   print
   print "A matching key was found:"
   GPGPrintKeyInfo(Keys[0]);
   break;

# Crack up the email address from the key into a best guess
# first/middle/last name
Addr = SplitEmail(Keys[0][2]);
(cn,mn,sn) = NameSplit(re.sub('["]','',Addr[0]))
emailaddr = Addr[1] + '@' + Addr[2];
account = Addr[1];

privsub = emailaddr
gidNumber = 0;
uidNumber = 0;

# Decide if we should use IDEA encryption
UsePGP2 = 0;
while len(Keys[0][1]) < 40:
   Res = raw_input("Use PGP2.x compatibility [No/yes]? ");
   if Res == "yes":
      UsePGP2 = 1;
      break;
   if Res == "":
      break;

Update = 0
Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"keyFingerPrint=" + Keys[0][1]);
if len(Attrs) != 0:
   print "*** This key already belongs to",GetAttr(Attrs[0],"uid");
   account = GetAttr(Attrs[0],"uid");
   Update = 1

# Try to get a uniq account name
while 1:
   if Update == 0:
      Res = raw_input("Login account [" + account + "]? ");
      if Res != "":
         account = Res;
   Attrs = l.search_s(BaseDn,ldap.SCOPE_ONELEVEL,"uid=" + account);
   if len(Attrs) == 0:
      privsub = "%s@debian.org"%(account);
      break;
   Res = raw_input("That account already exists, update [No/yes]? ");
   if Res == "yes":
      # Update mode, fetch the default values from the directory
      Update = 1;
      privsub = GetAttr(Attrs[0],"privateSub");
      gidNumber = GetAttr(Attrs[0],"gidNumber");
      uidNumber = GetAttr(Attrs[0],"uidNumber");
      emailaddr = GetAttr(Attrs[0],"emailForward");
      cn = GetAttr(Attrs[0],"cn");
      sn = GetAttr(Attrs[0],"sn");
      mn = GetAttr(Attrs[0],"mn");
      if privsub == None or privsub == "":
         privsub = " ";
      break;
   else:
      sys.exit(1)

# Prompt for the first/last name and email address
Res = raw_input("First name [" + cn + "]? ");
if Res != "":
   cn = Res;
Res = raw_input("Middle name [" + mn + "]? ");
if Res == " ":
   mn = ""
elif Res != "":
   mn = Res;
Res = raw_input("Last name [" + sn + "]? ");
if Res != "":
   sn = Res;
Res = raw_input("Email forwarding address [" + emailaddr + "]? ");
if Res != "":
   emailaddr = Res;

# Debian-Private subscription
if HavePrivateList and not GuestAccount:
   Res = raw_input("Subscribe to debian-private (space is none) [" + privsub + "]? ");
   if Res != "":
      privsub = Res;
else:
   privsub = " "


(uidNumber, generatedGID) = GetFreeID(l)
if not gidNumber:
   gidNumber = generatedGID

UserGroup = 1
if NoAutomaticIDs:
   # UID
   if not Update:
      Res = raw_input("User ID Number [%s]? " % (uidNumber));
      if Res != "":
         uidNumber = Res;
   
   # GID
   Res = raw_input("Group ID Number (new usergroup is %s) [%s]" % (generatedGID, gidNumber));
   if Res != "":
      if Res.isdigit():
         gidNumber = int(Res);
      else:
         gidNumber = Group2GID(l, Res);
   
   if gidNumber != generatedGID:
      UserGroup = 0

if GuestAccount:
  supplementaryGid = 'guest'
else:
  supplementaryGid = DefaultGroup

shadowExpire = None
hostacl = []
if GuestAccount:
   res = raw_input("Expires in xx days [60] (0 to disable)")
   if res == "": res = '60'
   exp = int(res)
   if exp > 0:
      shadowExpire = int(time.time() / 3600 / 24) + exp
   res = raw_input("Hosts to grant access to: ")
   for h in res.split():
      if not '.' in h: h = h + '.' + HostDomain
      if exp > 0: h = h + " " + datetime.datetime.fromtimestamp( time.time() + exp * 24*3600 ).strftime("%Y%m%d")
      hostacl.append(h)


# Generate a random password
if Update == 0 or ForceMail == 1:
   Password = raw_input("User's Password (Enter for random)? ");

   if Password == "":
      print "Randomizing and encrypting password"
      Password = GenPass();
      Pass = HashPass(Password);

      # Use GPG to encrypt it, pass the fingerprint to ID it
      CryptedPass = GPGEncrypt("Your new password is '" + Password + "'\n",\
                               "0x"+Keys[0][1],UsePGP2);
      Password = None;
      if CryptedPass == None:
        raise "Error","Password Encryption failed"
   else:
      Pass = HashPass(Password);
      CryptedPass = "Your password has been set to the previously agreed value.";
else:
   CryptedPass = "";
   Pass = None;

# Now we have all the bits of information.
if mn != "":
   FullName = "%s %s %s" % (cn,mn,sn);
else:
   FullName = "%s %s" % (cn,sn);
print "------------";
print "Final information collected:"
print " %s <%s@%s>:" % (FullName,account,EmailAppend);
print "   Assigned UID:",uidNumber," GID:", gidNumber;
print "   supplementary group:",supplementaryGid
print "   Email forwarded to:",emailaddr
if HavePrivateList:
   print "   Private Subscription:",privsub;
print "   GECOS Field: \"%s,,,,\"" % (FullName);
print "   Login Shell: /bin/bash";
print "   Key Fingerprint:",Keys[0][1];
if shadowExpire:
   print "   ShadowExpire: %d (%s)"%(shadowExpire, datetime.datetime.fromtimestamp( shadowExpire * 24*3600 ).strftime("%Y%m%d") )
for h in hostacl:
   print "   allowedHost: ", h

Res = raw_input("Continue [No/yes]? ");
if Res != "yes":
   sys.exit(1);

# Initialize the substitution Map
Subst = {}

encrealname = ''
try:
  encrealname = FullName.decode('us-ascii')
except UnicodeError:
  encrealname = str(email.Header.Header(FullName, 'utf-8', 200))

Subst["__ENCODED_REALNAME__"] = encrealname
Subst["__REALNAME__"] = FullName;
Subst["__WHOAMI__"] = pwd.getpwuid(os.getuid())[0];
Subst["__DATE__"] = time.strftime("%a, %d %b %Y %H:%M:%S +0000",time.gmtime(time.time()));
Subst["__LOGIN__"] = account;
Subst["__PRIVATE__"] = privsub;
Subst["__EMAIL__"] = emailaddr
Subst["__PASSWORD__"] = CryptedPass;

# Submit the modification request
Dn = "uid=" + account + "," + BaseDn;
print "Updating LDAP directory..",
sys.stdout.flush();

if Update == 0:
   # New account
   Details = [("uid",account),
              ("objectClass", UserObjectClasses),
              ("uidNumber",str(uidNumber)),
              ("gidNumber",str(gidNumber)),
              ("supplementaryGid",supplementaryGid),
              ("gecos",FullName+",,,,"),
              ("loginShell","/bin/bash"),
              ("keyFingerPrint",Keys[0][1]),
              ("cn",cn),
              ("sn",sn),
              ("emailForward",emailaddr),
              ("shadowLastChange",str(int(time.time()/24/60/60))),
              ("shadowMin","0"),
              ("shadowMax","99999"),
              ("shadowWarning","7"),
              ("userPassword","{crypt}"+Pass)];
   if mn:
      Details.append(("mn",mn));
   if privsub != " ":
      Details.append(("privateSub",privsub))
   if shadowExpire:
      Details.append(("shadowExpire",str(shadowExpire)))
   if len(hostacl) > 0:
      Details.append(("allowedHost",hostacl))

   l.add_s(Dn,Details);

   #Add user group if needed, then the actual user:
   if UserGroup == 1:
      Dn = "gid=" + account + "," + BaseDn;
      l.add_s(Dn,[("gid",account), ("gidNumber",str(gidNumber)), ("objectClass", GroupObjectClasses)])
else:
   # Modification
   Rec = [(ldap.MOD_REPLACE,"uidNumber",str(uidNumber)),
          (ldap.MOD_REPLACE,"gidNumber",str(gidNumber)),
          (ldap.MOD_REPLACE,"gecos",FullName+",,,,"),
          (ldap.MOD_REPLACE,"loginShell","/bin/bash"),
          (ldap.MOD_REPLACE,"keyFingerPrint",Keys[0][1]),
          (ldap.MOD_REPLACE,"cn",cn),
          (ldap.MOD_REPLACE,"mn",mn),
          (ldap.MOD_REPLACE,"sn",sn),
          (ldap.MOD_REPLACE,"emailForward",emailaddr),
          (ldap.MOD_REPLACE,"shadowLastChange",str(int(time.time()/24/60/60))),
          (ldap.MOD_REPLACE,"shadowMin","0"),
          (ldap.MOD_REPLACE,"shadowMax","99999"),
          (ldap.MOD_REPLACE,"shadowWarning","7"),
          (ldap.MOD_REPLACE,"shadowInactive",""),
          (ldap.MOD_REPLACE,"shadowExpire","")];
   if privsub != " ":
      Rec.append((ldap.MOD_REPLACE,"privateSub",privsub));
   if Pass != None:
      Rec.append((ldap.MOD_REPLACE,"userPassword","{crypt}"+Pass));
   # Do it
   l.modify_s(Dn,Rec);

print;

# Abort email sends for an update operation
if Update == 1 and ForceMail == 0:
   print "Account is not new, Not sending mails"
   sys.exit(0);

# Send the Welcome message
print "Sending Welcome Email"
templatepath = TemplatesDir + "/welcome-message-%s" % supplementaryGid
if not os.path.exists(templatepath):
   templatepath = TemplatesDir + "/welcome-message"
Reply = TemplateSubst(Subst,open(templatepath, "r").read())
Child = os.popen("/usr/sbin/sendmail -t","w");
#Child = os.popen("cat","w");
Child.write(Reply);
if Child.close() != None:
   raise Error, "Sendmail gave a non-zero return code";

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