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/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Password and authentication handling
   Copyright (C) Andrew Tridgell 1992-1998
   
   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.
*/

#include "includes.h"

extern int DEBUGLEVEL;

/* this holds info on user ids that are already validated for this VC */
static user_struct *validated_users = NULL;
static int num_validated_users = 0;

/****************************************************************************
check if a uid has been validated, and return an pointer to the user_struct
if it has. NULL if not. vuid is biased by an offset. This allows us to
tell random client vuid's (normally zero) from valid vuids.
****************************************************************************/
user_struct *get_valid_user_struct(uint16 vuid)
{
  if (vuid == UID_FIELD_INVALID)
    return NULL;
  vuid -= VUID_OFFSET;
  if ((vuid >= (uint16)num_validated_users) || 
     (validated_users[vuid].uid == (uid_t)-1) || (validated_users[vuid].gid == (gid_t)-1))
    return NULL;
  return &validated_users[vuid];
}

/****************************************************************************
invalidate a uid
****************************************************************************/
void invalidate_vuid(uint16 vuid)
{
  user_struct *vuser = get_valid_user_struct(vuid);

  if (vuser == NULL) return;

  vuser->uid = (uid_t)-1;
  vuser->gid = (gid_t)-1;

  vuser->n_sids = 0;

  /* same number of igroups as groups */
  vuser->n_groups = 0;

  if (vuser->groups)
    free((char *)vuser->groups);

  if (vuser->sids)
    free((char *)vuser->sids);

  vuser->sids    = NULL;
  vuser->groups  = NULL;
}


/****************************************************************************
return a validated username
****************************************************************************/
char *validated_username(uint16 vuid)
{
  user_struct *vuser = get_valid_user_struct(vuid);
  if (vuser == NULL)
    return 0;
  return(vuser->name);
}



/****************************************************************************
register a uid/name pair as being valid and that a valid password
has been given. vuid is biased by an offset. This allows us to
tell random client vuid's (normally zero) from valid vuids.
****************************************************************************/
uint16 register_vuid(uid_t uid,gid_t gid, char *unix_name, char *requested_name, BOOL guest, uchar user_sess_key[16])
{
  user_struct *vuser;
  struct passwd *pwfile; /* for getting real name from passwd file */

  /* Ensure no vuid gets registered in share level security. */
  if(lp_security() == SEC_SHARE)
    return UID_FIELD_INVALID;

#if 0
  /*
   * After observing MS-Exchange services writing to a Samba share
   * I belive this code is incorrect. Each service does its own
   * sessionsetup_and_X for the same user, and as each service shuts
   * down, it does a user_logoff_and_X. As we are consolidating multiple
   * sessionsetup_and_X's onto the same vuid here, when the first service
   * shuts down, it invalidates all the open files for the other services.
   * Hence I am removing this code and forcing each sessionsetup_and_X
   * to get a new vuid.
   * Jeremy Allison. (jallison@whistle.com).
   */

  int i;
  for(i = 0; i < num_validated_users; i++) {
    vuser = &validated_users[i];
    if ( vuser->uid == uid )
      return (uint16)(i + VUID_OFFSET); /* User already validated */
  }
#endif

  validated_users = (user_struct *)Realloc(validated_users,
			   sizeof(user_struct)*
			   (num_validated_users+1));
  
  if (!validated_users)
    {
      DEBUG(0,("Failed to realloc users struct!\n"));
      num_validated_users = 0;
      return UID_FIELD_INVALID;
    }

  vuser = &validated_users[num_validated_users];
  num_validated_users++;

  vuser->uid = uid;
  vuser->gid = gid;
  vuser->guest = guest;
  fstrcpy(vuser->name,unix_name);
  fstrcpy(vuser->requested_name,requested_name);
  memcpy(vuser->dc.user_sess_key, user_sess_key, sizeof(vuser->dc.user_sess_key));

  vuser->n_sids = 0;
  vuser->sids   = NULL;

  vuser->n_groups = 0;
  vuser->groups  = NULL;

  /* Find all the groups this uid is in and store them. 
     Used by become_user() */
  get_unixgroups(unix_name,uid,gid,
	       &vuser->n_groups,
	       &vuser->groups);

  DEBUG(3,("uid %d registered to name %s\n",(int)uid,unix_name));

  DEBUG(3, ("Clearing default real name\n"));
  fstrcpy(vuser->real_name, "<Full Name>\0");
  if (lp_unix_realname()) {
    if ((pwfile=hashed_getpwnam(vuser->name))!= NULL)
      {
      DEBUG(3, ("User name: %s\tReal name: %s\n",vuser->name,pwfile->pw_gecos));
      fstrcpy(vuser->real_name, pwfile->pw_gecos);
      }
  }

  return (uint16)((num_validated_users - 1) + VUID_OFFSET);
}