r505: Break out algorithmic_gid_to_sid so that those of us who need it can use it.

[Samba.git] / source3 / passdb / passdb.c

/* 
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Jeremy Allison                 1996-2001
   Copyright (C) Luke Kenneth Casson Leighton   1996-1998
   Copyright (C) Gerald (Jerry) Carter          2000-2001
   Copyright (C) Andrew Bartlett                2001-2002
   Copyright (C) Simo Sorce                     2003
      
   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"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB

/******************************************************************
 get the default domain/netbios name to be used when 
 testing authentication.  For example, if you connect
 to a Windows member server using a bogus domain name, the
 Windows box will map the BOGUS\user to DOMAIN\user.  A 
 standalone box will map to WKS\user.
******************************************************************/

const char *get_default_sam_name(void)
{
        /* standalone servers can only use the local netbios name */
        if ( lp_server_role() == ROLE_STANDALONE )
                return global_myname();

        /* Windows domain members default to the DOMAIN
           name when not specified */
        return lp_workgroup();
}

/************************************************************
 Fill the SAM_ACCOUNT with default values.
 ***********************************************************/

void pdb_fill_default_sam(SAM_ACCOUNT *user)
{
        ZERO_STRUCT(user->private); /* Don't touch the talloc context */

        /* no initial methods */
        user->methods = NULL;

        /* Don't change these timestamp settings without a good reason.
           They are important for NT member server compatibility. */

        user->private.logon_time            = (time_t)0;
        user->private.pass_last_set_time    = (time_t)0;
        user->private.pass_can_change_time  = (time_t)0;
        user->private.logoff_time           = 
        user->private.kickoff_time          = 
        user->private.pass_must_change_time = get_time_t_max();
        user->private.fields_present        = 0x00ffffff;
        user->private.logon_divs = 168;         /* hours per week */
        user->private.hours_len = 21;           /* 21 times 8 bits = 168 */
        memset(user->private.hours, 0xff, user->private.hours_len); /* available at all hours */
        user->private.bad_password_count = 0;
        user->private.logon_count = 0;
        user->private.unknown_6 = 0x000004ec; /* don't know */

        /* Some parts of samba strlen their pdb_get...() returns, 
           so this keeps the interface unchanged for now. */
           
        user->private.username = "";
        user->private.domain = "";
        user->private.nt_username = "";
        user->private.full_name = "";
        user->private.home_dir = "";
        user->private.logon_script = "";
        user->private.profile_path = "";
        user->private.acct_desc = "";
        user->private.workstations = "";
        user->private.unknown_str = "";
        user->private.munged_dial = "";

        user->private.plaintext_pw = NULL;

        /* 
           Unless we know otherwise have a Account Control Bit
           value of 'normal user'.  This helps User Manager, which
           asks for a filtered list of users.
        */

        user->private.acct_ctrl = ACB_NORMAL;
}       

static void destroy_pdb_talloc(SAM_ACCOUNT **user) 
{
        if (*user) {
                data_blob_clear_free(&((*user)->private.lm_pw));
                data_blob_clear_free(&((*user)->private.nt_pw));

                if((*user)->private.plaintext_pw!=NULL)
                        memset((*user)->private.plaintext_pw,'\0',strlen((*user)->private.plaintext_pw));
                talloc_destroy((*user)->mem_ctx);
                *user = NULL;
        }
}


/**********************************************************************
 Allocates memory and initialises a struct sam_passwd on supplied mem_ctx.
***********************************************************************/

NTSTATUS pdb_init_sam_talloc(TALLOC_CTX *mem_ctx, SAM_ACCOUNT **user)
{
        if (*user != NULL) {
                DEBUG(0,("pdb_init_sam_talloc: SAM_ACCOUNT was non NULL\n"));
#if 0
                smb_panic("non-NULL pointer passed to pdb_init_sam\n");
#endif
                return NT_STATUS_UNSUCCESSFUL;
        }

        if (!mem_ctx) {
                DEBUG(0,("pdb_init_sam_talloc: mem_ctx was NULL!\n"));
                return NT_STATUS_UNSUCCESSFUL;
        }

        *user=(SAM_ACCOUNT *)talloc(mem_ctx, sizeof(SAM_ACCOUNT));

        if (*user==NULL) {
                DEBUG(0,("pdb_init_sam_talloc: error while allocating memory\n"));
                return NT_STATUS_NO_MEMORY;
        }

        (*user)->mem_ctx = mem_ctx;

        (*user)->free_fn = NULL;

        pdb_fill_default_sam(*user);
        
        return NT_STATUS_OK;
}


/*************************************************************
 Allocates memory and initialises a struct sam_passwd.
 ************************************************************/

NTSTATUS pdb_init_sam(SAM_ACCOUNT **user)
{
        TALLOC_CTX *mem_ctx;
        NTSTATUS nt_status;
        
        mem_ctx = talloc_init("passdb internal SAM_ACCOUNT allocation");

        if (!mem_ctx) {
                DEBUG(0,("pdb_init_sam: error while doing talloc_init()\n"));
                return NT_STATUS_NO_MEMORY;
        }

        if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam_talloc(mem_ctx, user))) {
                talloc_destroy(mem_ctx);
                return nt_status;
        }
        
        (*user)->free_fn = destroy_pdb_talloc;

        return NT_STATUS_OK;
}

/**************************************************************************
 * This function will take care of all the steps needed to correctly
 * allocate and set the user SID, please do use this function to create new
 * users, messing with SIDs is not good.
 *
 * account_data must be provided initialized, pwd may be null.
 *                                                                      SSS
 ***************************************************************************/

static NTSTATUS pdb_set_sam_sids(SAM_ACCOUNT *account_data, const struct passwd *pwd)
{
        const char *guest_account = lp_guestaccount();
        GROUP_MAP map;
        BOOL ret;
        
        if (!account_data || !pwd) {
                return NT_STATUS_INVALID_PARAMETER;
        }

        /* this is a hack this thing should not be set
           this way --SSS */
        if (!(guest_account && *guest_account)) {
                DEBUG(1, ("NULL guest account!?!?\n"));
                return NT_STATUS_UNSUCCESSFUL;
        } else {
                /* Ensure this *must* be set right */
                if (strcmp(pwd->pw_name, guest_account) == 0) {
                        if (!pdb_set_user_sid_from_rid(account_data, DOMAIN_USER_RID_GUEST, PDB_DEFAULT)) {
                                return NT_STATUS_UNSUCCESSFUL;
                        }
                        if (!pdb_set_group_sid_from_rid(account_data, DOMAIN_GROUP_RID_GUESTS, PDB_DEFAULT)) {
                                return NT_STATUS_UNSUCCESSFUL;
                        }
                        return NT_STATUS_OK;
                }
        }

        if (!pdb_set_user_sid_from_rid(account_data, fallback_pdb_uid_to_user_rid(pwd->pw_uid), PDB_SET)) {
                DEBUG(0,("Can't set User SID from RID!\n"));
                return NT_STATUS_INVALID_PARAMETER;
        }
        
        /* call the mapping code here */
        become_root();
        ret = pdb_getgrgid(&map, pwd->pw_gid);
        unbecome_root();
        
        if( ret ) {
                if (!pdb_set_group_sid(account_data, &map.sid, PDB_SET)){
                        DEBUG(0,("Can't set Group SID!\n"));
                        return NT_STATUS_INVALID_PARAMETER;
                }
        } 
        else {
                if (!pdb_set_group_sid_from_rid(account_data, pdb_gid_to_group_rid(pwd->pw_gid), PDB_SET)) {
                        DEBUG(0,("Can't set Group SID\n"));
                        return NT_STATUS_INVALID_PARAMETER;
                }
        }

        return NT_STATUS_OK;
}

/*************************************************************
 Initialises a struct sam_passwd with sane values.
 ************************************************************/

NTSTATUS pdb_fill_sam_pw(SAM_ACCOUNT *sam_account, const struct passwd *pwd)
{
        NTSTATUS ret;

        if (!pwd) {
                return NT_STATUS_UNSUCCESSFUL;
        }

        pdb_fill_default_sam(sam_account);

        pdb_set_username(sam_account, pwd->pw_name, PDB_SET);
        pdb_set_fullname(sam_account, pwd->pw_gecos, PDB_SET);

        pdb_set_unix_homedir(sam_account, pwd->pw_dir, PDB_SET);

        pdb_set_domain (sam_account, get_global_sam_name(), PDB_DEFAULT);
        
        /* When we get a proper uid -> SID and SID -> uid allocation
           mechinism, we should call it here.  
           
           We can't just set this to 0 or allow it only to be filled
           in when added to the backend, because the user's SID 
           may already be in security descriptors etc.
           
           -- abartlet 11-May-02
        */

        ret = pdb_set_sam_sids(sam_account, pwd);
        if (!NT_STATUS_IS_OK(ret)) return ret;

        /* check if this is a user account or a machine account */
        if (pwd->pw_name[strlen(pwd->pw_name)-1] != '$')
        {
                pdb_set_profile_path(sam_account, 
                                     talloc_sub_specified((sam_account)->mem_ctx, 
                                                            lp_logon_path(), 
                                                            pwd->pw_name, global_myname(), 
                                                            pwd->pw_uid, pwd->pw_gid), 
                                     PDB_DEFAULT);
                
                pdb_set_homedir(sam_account, 
                                talloc_sub_specified((sam_account)->mem_ctx, 
                                                       lp_logon_home(),
                                                       pwd->pw_name, global_myname(), 
                                                       pwd->pw_uid, pwd->pw_gid),
                                PDB_DEFAULT);
                
                pdb_set_dir_drive(sam_account, 
                                  talloc_sub_specified((sam_account)->mem_ctx, 
                                                         lp_logon_drive(),
                                                         pwd->pw_name, global_myname(), 
                                                         pwd->pw_uid, pwd->pw_gid),
                                  PDB_DEFAULT);
                
                pdb_set_logon_script(sam_account, 
                                     talloc_sub_specified((sam_account)->mem_ctx, 
                                                            lp_logon_script(),
                                                            pwd->pw_name, global_myname(), 
                                                            pwd->pw_uid, pwd->pw_gid), 
                                     PDB_DEFAULT);
                if (!pdb_set_acct_ctrl(sam_account, ACB_NORMAL, PDB_DEFAULT)) {
                        DEBUG(1, ("Failed to set 'normal account' flags for user %s.\n", pwd->pw_name));
                        return NT_STATUS_UNSUCCESSFUL;
                }
        } else {
                if (!pdb_set_acct_ctrl(sam_account, ACB_WSTRUST, PDB_DEFAULT)) {
                        DEBUG(1, ("Failed to set 'trusted workstation account' flags for user %s.\n", pwd->pw_name));
                        return NT_STATUS_UNSUCCESSFUL;
                }
        }
        return NT_STATUS_OK;
}


/*************************************************************
 Initialises a struct sam_passwd with sane values.
 ************************************************************/

NTSTATUS pdb_init_sam_pw(SAM_ACCOUNT **new_sam_acct, const struct passwd *pwd)
{
        NTSTATUS nt_status;

        if (!pwd) {
                new_sam_acct = NULL;
                return NT_STATUS_INVALID_PARAMETER;
        }

        if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam(new_sam_acct))) {
                new_sam_acct = NULL;
                return nt_status;
        }

        if (!NT_STATUS_IS_OK(nt_status = pdb_fill_sam_pw(*new_sam_acct, pwd))) {
                pdb_free_sam(new_sam_acct);
                new_sam_acct = NULL;
                return nt_status;
        }

        return NT_STATUS_OK;
}


/*************************************************************
 Initialises a SAM_ACCOUNT ready to add a new account, based
 on the UNIX user.  Pass in a RID if you have one
 ************************************************************/

NTSTATUS pdb_init_sam_new(SAM_ACCOUNT **new_sam_acct, const char *username,
                          uint32 rid)
{
        NTSTATUS        nt_status = NT_STATUS_NO_MEMORY;
        struct passwd   *pwd;
        BOOL            ret;
        
        pwd = Get_Pwnam(username);

        if (!pwd) 
                return NT_STATUS_NO_SUCH_USER;
        
        if (!NT_STATUS_IS_OK(nt_status = pdb_init_sam_pw(new_sam_acct, pwd))) {
                *new_sam_acct = NULL;
                return nt_status;
        }
        
        /* see if we need to generate a new rid using the 2.2 algorithm */
        if ( rid == 0 && lp_enable_rid_algorithm() ) {
                DEBUG(10,("pdb_init_sam_new: no RID specified.  Generating one via old algorithm\n"));
                rid = fallback_pdb_uid_to_user_rid(pwd->pw_uid);
        }
        
        /* set the new SID */
        
        ret = pdb_set_user_sid_from_rid( *new_sam_acct, rid, PDB_SET );
         
        return (ret ? NT_STATUS_OK : NT_STATUS_NO_SUCH_USER);
}


/**
 * Free the contets of the SAM_ACCOUNT, but not the structure.
 *
 * Also wipes the LM and NT hashes and plaintext password from 
 * memory.
 *
 * @param user SAM_ACCOUNT to free members of.
 **/

static void pdb_free_sam_contents(SAM_ACCOUNT *user)
{

        /* Kill off sensitive data.  Free()ed by the
           talloc mechinism */

        data_blob_clear_free(&(user->private.lm_pw));
        data_blob_clear_free(&(user->private.nt_pw));
        if (user->private.plaintext_pw!=NULL)
                memset(user->private.plaintext_pw,'\0',strlen(user->private.plaintext_pw));

        if (user->private.backend_private_data && user->private.backend_private_data_free_fn) {
                user->private.backend_private_data_free_fn(&user->private.backend_private_data);
        }
}


/************************************************************
 Reset the SAM_ACCOUNT and free the NT/LM hashes.
 ***********************************************************/

NTSTATUS pdb_reset_sam(SAM_ACCOUNT *user)
{
        if (user == NULL) {
                DEBUG(0,("pdb_reset_sam: SAM_ACCOUNT was NULL\n"));
#if 0
                smb_panic("NULL pointer passed to pdb_free_sam\n");
#endif
                return NT_STATUS_UNSUCCESSFUL;
        }
        
        pdb_free_sam_contents(user);

        pdb_fill_default_sam(user);

        return NT_STATUS_OK;
}


/************************************************************
 Free the SAM_ACCOUNT and the member pointers.
 ***********************************************************/

NTSTATUS pdb_free_sam(SAM_ACCOUNT **user)
{
        if (*user == NULL) {
                DEBUG(0,("pdb_free_sam: SAM_ACCOUNT was NULL\n"));
#if 0
                smb_panic("NULL pointer passed to pdb_free_sam\n");
#endif
                return NT_STATUS_UNSUCCESSFUL;
        }

        pdb_free_sam_contents(*user);
        
        if ((*user)->free_fn) {
                (*user)->free_fn(user);
        }

        return NT_STATUS_OK;    
}

/**********************************************************
 Encode the account control bits into a string.
 length = length of string to encode into (including terminating
 null). length *MUST BE MORE THAN 2* !
 **********************************************************/

char *pdb_encode_acct_ctrl(uint16 acct_ctrl, size_t length)
{
        static fstring acct_str;

        size_t i = 0;

        SMB_ASSERT(length <= sizeof(acct_str));

        acct_str[i++] = '[';

        if (acct_ctrl & ACB_PWNOTREQ ) acct_str[i++] = 'N';
        if (acct_ctrl & ACB_DISABLED ) acct_str[i++] = 'D';
        if (acct_ctrl & ACB_HOMDIRREQ) acct_str[i++] = 'H';
        if (acct_ctrl & ACB_TEMPDUP  ) acct_str[i++] = 'T'; 
        if (acct_ctrl & ACB_NORMAL   ) acct_str[i++] = 'U';
        if (acct_ctrl & ACB_MNS      ) acct_str[i++] = 'M';
        if (acct_ctrl & ACB_WSTRUST  ) acct_str[i++] = 'W';
        if (acct_ctrl & ACB_SVRTRUST ) acct_str[i++] = 'S';
        if (acct_ctrl & ACB_AUTOLOCK ) acct_str[i++] = 'L';
        if (acct_ctrl & ACB_PWNOEXP  ) acct_str[i++] = 'X';
        if (acct_ctrl & ACB_DOMTRUST ) acct_str[i++] = 'I';

        for ( ; i < length - 2 ; i++ )
                acct_str[i] = ' ';

        i = length - 2;
        acct_str[i++] = ']';
        acct_str[i++] = '\0';

        return acct_str;
}     

/**********************************************************
 Decode the account control bits from a string.
 **********************************************************/

uint16 pdb_decode_acct_ctrl(const char *p)
{
        uint16 acct_ctrl = 0;
        BOOL finished = False;

        /*
         * Check if the account type bits have been encoded after the
         * NT password (in the form [NDHTUWSLXI]).
         */

        if (*p != '[')
                return 0;

        for (p++; *p && !finished; p++) {
                switch (*p) {
                        case 'N': { acct_ctrl |= ACB_PWNOTREQ ; break; /* 'N'o password. */ }
                        case 'D': { acct_ctrl |= ACB_DISABLED ; break; /* 'D'isabled. */ }
                        case 'H': { acct_ctrl |= ACB_HOMDIRREQ; break; /* 'H'omedir required. */ }
                        case 'T': { acct_ctrl |= ACB_TEMPDUP  ; break; /* 'T'emp account. */ } 
                        case 'U': { acct_ctrl |= ACB_NORMAL   ; break; /* 'U'ser account (normal). */ } 
                        case 'M': { acct_ctrl |= ACB_MNS      ; break; /* 'M'NS logon user account. What is this ? */ } 
                        case 'W': { acct_ctrl |= ACB_WSTRUST  ; break; /* 'W'orkstation account. */ } 
                        case 'S': { acct_ctrl |= ACB_SVRTRUST ; break; /* 'S'erver account. */ } 
                        case 'L': { acct_ctrl |= ACB_AUTOLOCK ; break; /* 'L'ocked account. */ } 
                        case 'X': { acct_ctrl |= ACB_PWNOEXP  ; break; /* No 'X'piry on password */ } 
                        case 'I': { acct_ctrl |= ACB_DOMTRUST ; break; /* 'I'nterdomain trust account. */ }
            case ' ': { break; }
                        case ':':
                        case '\n':
                        case '\0': 
                        case ']':
                        default:  { finished = True; }
                }
        }

        return acct_ctrl;
}

/*************************************************************
 Routine to set 32 hex password characters from a 16 byte array.
**************************************************************/

void pdb_sethexpwd(char *p, const unsigned char *pwd, uint16 acct_ctrl)
{
        if (pwd != NULL) {
                int i;
                for (i = 0; i < 16; i++)
                        slprintf(&p[i*2], 3, "%02X", pwd[i]);
        } else {
                if (acct_ctrl & ACB_PWNOTREQ)
                        safe_strcpy(p, "NO PASSWORDXXXXXXXXXXXXXXXXXXXXX", 33);
                else
                        safe_strcpy(p, "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", 33);
        }
}

/*************************************************************
 Routine to get the 32 hex characters and turn them
 into a 16 byte array.
**************************************************************/

BOOL pdb_gethexpwd(const char *p, unsigned char *pwd)
{
        int i;
        unsigned char   lonybble, hinybble;
        const char      *hexchars = "0123456789ABCDEF";
        char           *p1, *p2;
        
        if (!p)
                return (False);
        
        for (i = 0; i < 32; i += 2) {
                hinybble = toupper(p[i]);
                lonybble = toupper(p[i + 1]);

                p1 = strchr(hexchars, hinybble);
                p2 = strchr(hexchars, lonybble);

                if (!p1 || !p2)
                        return (False);

                hinybble = PTR_DIFF(p1, hexchars);
                lonybble = PTR_DIFF(p2, hexchars);

                pwd[i / 2] = (hinybble << 4) | lonybble;
        }
        return (True);
}

int algorithmic_rid_base(void)
{
        static int rid_offset = 0;

        if (rid_offset != 0)
                return rid_offset;

        rid_offset = lp_algorithmic_rid_base();

        if (rid_offset < BASE_RID) {  
                /* Try to prevent admin foot-shooting, we can't put algorithmic
                   rids below 1000, that's the 'well known RIDs' on NT */
                DEBUG(0, ("'algorithmic rid base' must be equal to or above %ld\n", BASE_RID));
                rid_offset = BASE_RID;
        }
        if (rid_offset & 1) {
                DEBUG(0, ("algorithmic rid base must be even\n"));
                rid_offset += 1;
        }
        return rid_offset;
}

/*******************************************************************
 Converts NT user RID to a UNIX uid.
 ********************************************************************/

uid_t fallback_pdb_user_rid_to_uid(uint32 user_rid)
{
        int rid_offset = algorithmic_rid_base();
        return (uid_t)(((user_rid & (~USER_RID_TYPE)) - rid_offset)/RID_MULTIPLIER);
}

/*******************************************************************
 converts UNIX uid to an NT User RID.
 ********************************************************************/

uint32 fallback_pdb_uid_to_user_rid(uid_t uid)
{
        int rid_offset = algorithmic_rid_base();
        return (((((uint32)uid)*RID_MULTIPLIER) + rid_offset) | USER_RID_TYPE);
}

/*******************************************************************
 Converts NT group RID to a UNIX gid.
 ********************************************************************/

gid_t pdb_group_rid_to_gid(uint32 group_rid)
{
        int rid_offset = algorithmic_rid_base();
        return (gid_t)(((group_rid & (~GROUP_RID_TYPE))- rid_offset)/RID_MULTIPLIER);
}

/*******************************************************************
 converts NT Group RID to a UNIX uid.
 
 warning: you must not call that function only
 you must do a call to the group mapping first.
 there is not anymore a direct link between the gid and the rid.
 ********************************************************************/

uint32 pdb_gid_to_group_rid(gid_t gid)
{
        int rid_offset = algorithmic_rid_base();
        return (((((uint32)gid)*RID_MULTIPLIER) + rid_offset) | GROUP_RID_TYPE);
}

/*******************************************************************
 Decides if a RID is a well known RID.
 ********************************************************************/

static BOOL pdb_rid_is_well_known(uint32 rid)
{
        /* Not using rid_offset here, because this is the actual
           NT fixed value (1000) */

        return (rid < BASE_RID);
}

/*******************************************************************
 Decides if a RID is a user or group RID.
 ********************************************************************/

BOOL fallback_pdb_rid_is_user(uint32 rid)
{
  /* lkcl i understand that NT attaches an enumeration to a RID
   * such that it can be identified as either a user, group etc
   * type.  there are 5 such categories, and they are documented.
   */
        /* However, they are not in the RID, just somthing you can query
           seperatly.  Sorry luke :-) */

   if(pdb_rid_is_well_known(rid)) {
      /*
       * The only well known user RIDs are DOMAIN_USER_RID_ADMIN
       * and DOMAIN_USER_RID_GUEST.
       */
     if(rid == DOMAIN_USER_RID_ADMIN || rid == DOMAIN_USER_RID_GUEST)
       return True;
   } else if((rid & RID_TYPE_MASK) == USER_RID_TYPE) {
     return True;
   }
   return False;
}

/*******************************************************************
 Convert a rid into a name. Used in the lookup SID rpc.
 ********************************************************************/

BOOL local_lookup_sid(const DOM_SID *sid, char *name, enum SID_NAME_USE *psid_name_use)
{
        uint32 rid;
        SAM_ACCOUNT *sam_account = NULL;
        GROUP_MAP map;
        BOOL ret;

        if (!sid_peek_check_rid(get_global_sam_sid(), sid, &rid)){
                DEBUG(0,("local_lookup_sid: sid_peek_check_rid return False! SID: %s\n",
                        sid_string_static(&map.sid)));
                return False;
        }       
        *psid_name_use = SID_NAME_UNKNOWN;
        
        DEBUG(5,("local_lookup_sid: looking up RID %u.\n", (unsigned int)rid));
        
        if (rid == DOMAIN_USER_RID_ADMIN) {
                const char **admin_list = lp_admin_users(-1);
                *psid_name_use = SID_NAME_USER;
                if (admin_list) {
                        const char *p = *admin_list;
                        if(!next_token(&p, name, NULL, sizeof(fstring)))
                                fstrcpy(name, "Administrator");
                } else {
                        fstrcpy(name, "Administrator");
                }
                return True;
        }

        if (!NT_STATUS_IS_OK(pdb_init_sam(&sam_account))) {
                return False;
        }
        
        /* see if the passdb can help us with the name of the user */

        /* BEING ROOT BLLOCK */
        become_root();
        if (pdb_getsampwsid(sam_account, sid)) {
                unbecome_root();                        /* -----> EXIT BECOME_ROOT() */
                fstrcpy(name, pdb_get_username(sam_account));
                *psid_name_use = SID_NAME_USER;

                pdb_free_sam(&sam_account);
                        
                return True;
        }
        pdb_free_sam(&sam_account);
        
        ret = pdb_getgrsid(&map, *sid);
        unbecome_root();
        /* END BECOME_ROOT BLOCK */
        
        if ( ret ) {
                if (map.gid!=(gid_t)-1) {
                        DEBUG(5,("local_lookup_sid: mapped group %s to gid %u\n", map.nt_name, (unsigned int)map.gid));
                } else {
                        DEBUG(5,("local_lookup_sid: mapped group %s to no unix gid.  Returning name.\n", map.nt_name));
                }

                fstrcpy(name, map.nt_name);
                *psid_name_use = map.sid_name_use;
                return True;
        }

        if (fallback_pdb_rid_is_user(rid)) {
                uid_t uid;
                struct passwd *pw = NULL;

                DEBUG(5, ("assuming RID %u is a user\n", (unsigned)rid));

                uid = fallback_pdb_user_rid_to_uid(rid);
                pw = sys_getpwuid( uid );
                
                DEBUG(5,("local_lookup_sid: looking up uid %u %s\n", (unsigned int)uid,
                         pw ? "succeeded" : "failed" ));
                         
                if ( !pw )
                        fstr_sprintf(name, "unix_user.%u", (unsigned int)uid);  
                else 
                        fstrcpy( name, pw->pw_name );
                        
                DEBUG(5,("local_lookup_sid: found user %s for rid %u\n", name,
                         (unsigned int)rid ));
                         
                *psid_name_use = SID_NAME_USER;
                
                return ( pw != NULL );
        } else {
                gid_t gid;
                struct group *gr; 
                        
                DEBUG(5, ("assuming RID %u is a group\n", (unsigned)rid));

                gid = pdb_group_rid_to_gid(rid);
                gr = getgrgid(gid);
                        
                *psid_name_use = SID_NAME_ALIAS;
                        
                DEBUG(5,("local_lookup_sid: looking up gid %u %s\n", (unsigned int)gid,
                         gr ? "succeeded" : "failed" ));
                        
                if( !gr )
                        fstr_sprintf(name, "unix_group.%u", (unsigned int)gid);
                else
                        fstrcpy( name, gr->gr_name);
                        
                DEBUG(5,("local_lookup_sid: found group %s for rid %u\n", name,
                         (unsigned int)rid ));
                
                /* assume fallback groups aer domain global groups */
                
                *psid_name_use = SID_NAME_DOM_GRP;
                
                return ( gr != NULL );
        }
}

/*******************************************************************
 Convert a name into a SID. Used in the lookup name rpc.
 ********************************************************************/

BOOL local_lookup_name(const char *c_user, DOM_SID *psid, enum SID_NAME_USE *psid_name_use)
{
        extern DOM_SID global_sid_World_Domain;
        DOM_SID local_sid;
        fstring user;
        SAM_ACCOUNT *sam_account = NULL;
        struct group *grp;
        GROUP_MAP map;
                
        *psid_name_use = SID_NAME_UNKNOWN;

        /*
         * user may be quoted a const string, and map_username and
         * friends can modify it. Make a modifiable copy. JRA.
         */

        fstrcpy(user, c_user);

        sid_copy(&local_sid, get_global_sam_sid());

        /*
         * Special case for MACHINE\Everyone. Map to the world_sid.
         */

        if(strequal(user, "Everyone")) {
                sid_copy( psid, &global_sid_World_Domain);
                sid_append_rid(psid, 0);
                *psid_name_use = SID_NAME_ALIAS;
                return True;
        }

        (void)map_username(user);

        if (!NT_STATUS_IS_OK(pdb_init_sam(&sam_account))) {
                return False;
        }
        
        /* BEGIN ROOT BLOCK */
        
        become_root();
        if (pdb_getsampwnam(sam_account, user)) {
                unbecome_root();
                sid_copy(psid, pdb_get_user_sid(sam_account));
                *psid_name_use = SID_NAME_USER;
                
                pdb_free_sam(&sam_account);
                return True;
        }

        pdb_free_sam(&sam_account);

        /*
         * Maybe it was a group ?
         */

        /* check if it's a mapped group */
        if (pdb_getgrnam(&map, user)) {
                /* yes it's a mapped group */
                sid_copy(&local_sid, &map.sid);
                *psid_name_use = map.sid_name_use;
        } else {
                /* it's not a mapped group */
                grp = getgrnam(user);
                if(!grp) {
                        unbecome_root();                /* ---> exit form block */      
                        return False;
                }
                
                /* 
                 *check if it's mapped, if it is reply it doesn't exist
                 *
                 * that's to prevent this case:
                 *
                 * unix group ug is mapped to nt group ng
                 * someone does a lookup on ug
                 * we must not reply as it doesn't "exist" anymore
                 * for NT. For NT only ng exists.
                 * JFM, 30/11/2001
                 */
                
                if (pdb_getgrgid(&map, grp->gr_gid)){
                        unbecome_root();                /* ---> exit form block */
                        return False;
                }
                
                sid_append_rid( &local_sid, pdb_gid_to_group_rid(grp->gr_gid));
                *psid_name_use = SID_NAME_ALIAS;
        }
        unbecome_root();
        /* END ROOT BLOCK */

        sid_copy( psid, &local_sid);

        return True;
}

/*************************************************************
 Change a password entry in the local smbpasswd file.
 *************************************************************/

BOOL local_password_change(const char *user_name, int local_flags,
                           const char *new_passwd, 
                           char *err_str, size_t err_str_len,
                           char *msg_str, size_t msg_str_len)
{
        SAM_ACCOUNT     *sam_pass=NULL;
        uint16 other_acb;

        *err_str = '\0';
        *msg_str = '\0';

        /* Get the smb passwd entry for this user */
        pdb_init_sam(&sam_pass);

        become_root();
        if(!pdb_getsampwnam(sam_pass, user_name)) {
                unbecome_root();
                pdb_free_sam(&sam_pass);
                
                if ((local_flags & LOCAL_ADD_USER) || (local_flags & LOCAL_DELETE_USER)) {
                        /* Might not exist in /etc/passwd.  Use rid algorithm here */
                        if (!NT_STATUS_IS_OK(pdb_init_sam_new(&sam_pass, user_name, 0))) {
                                slprintf(err_str, err_str_len-1, "Failed to initialise SAM_ACCOUNT for user %s.\n", user_name);
                                return False;
                        }
                } else {
                        slprintf(err_str, err_str_len-1,"Failed to find entry for user %s.\n", user_name);
                        return False;
                }
        } else {
                unbecome_root();
                /* the entry already existed */
                local_flags &= ~LOCAL_ADD_USER;
        }

        /* the 'other' acb bits not being changed here */
        other_acb =  (pdb_get_acct_ctrl(sam_pass) & (!(ACB_WSTRUST|ACB_DOMTRUST|ACB_SVRTRUST|ACB_NORMAL)));
        if (local_flags & LOCAL_TRUST_ACCOUNT) {
                if (!pdb_set_acct_ctrl(sam_pass, ACB_WSTRUST | other_acb, PDB_CHANGED) ) {
                        slprintf(err_str, err_str_len - 1, "Failed to set 'trusted workstation account' flags for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
                if (!pdb_set_acct_ctrl(sam_pass, ACB_DOMTRUST | other_acb, PDB_CHANGED)) {
                        slprintf(err_str, err_str_len - 1, "Failed to set 'domain trust account' flags for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        } else {
                if (!pdb_set_acct_ctrl(sam_pass, ACB_NORMAL | other_acb, PDB_CHANGED)) {
                        slprintf(err_str, err_str_len - 1, "Failed to set 'normal account' flags for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        }

        /*
         * We are root - just write the new password
         * and the valid last change time.
         */

        if (local_flags & LOCAL_DISABLE_USER) {
                if (!pdb_set_acct_ctrl (sam_pass, pdb_get_acct_ctrl(sam_pass)|ACB_DISABLED, PDB_CHANGED)) {
                        slprintf(err_str, err_str_len-1, "Failed to set 'disabled' flag for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        } else if (local_flags & LOCAL_ENABLE_USER) {
                if (!pdb_set_acct_ctrl (sam_pass, pdb_get_acct_ctrl(sam_pass)&(~ACB_DISABLED), PDB_CHANGED)) {
                        slprintf(err_str, err_str_len-1, "Failed to unset 'disabled' flag for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        }
        
        if (local_flags & LOCAL_SET_NO_PASSWORD) {
                if (!pdb_set_acct_ctrl (sam_pass, pdb_get_acct_ctrl(sam_pass)|ACB_PWNOTREQ, PDB_CHANGED)) {
                        slprintf(err_str, err_str_len-1, "Failed to set 'no password required' flag for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        } else if (local_flags & LOCAL_SET_PASSWORD) {
                /*
                 * If we're dealing with setting a completely empty user account
                 * ie. One with a password of 'XXXX', but not set disabled (like
                 * an account created from scratch) then if the old password was
                 * 'XX's then getsmbpwent will have set the ACB_DISABLED flag.
                 * We remove that as we're giving this user their first password
                 * and the decision hasn't really been made to disable them (ie.
                 * don't create them disabled). JRA.
                 */
                if ((pdb_get_lanman_passwd(sam_pass)==NULL) && (pdb_get_acct_ctrl(sam_pass)&ACB_DISABLED)) {
                        if (!pdb_set_acct_ctrl (sam_pass, pdb_get_acct_ctrl(sam_pass)&(~ACB_DISABLED), PDB_CHANGED)) {
                                slprintf(err_str, err_str_len-1, "Failed to unset 'disabled' flag for user %s.\n", user_name);
                                pdb_free_sam(&sam_pass);
                                return False;
                        }
                }
                if (!pdb_set_acct_ctrl (sam_pass, pdb_get_acct_ctrl(sam_pass)&(~ACB_PWNOTREQ), PDB_CHANGED)) {
                        slprintf(err_str, err_str_len-1, "Failed to unset 'no password required' flag for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
                
                if (!pdb_set_plaintext_passwd (sam_pass, new_passwd)) {
                        slprintf(err_str, err_str_len-1, "Failed to set password for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        }       

        if (local_flags & LOCAL_ADD_USER) {
                if (pdb_add_sam_account(sam_pass)) {
                        slprintf(msg_str, msg_str_len-1, "Added user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return True;
                } else {
                        slprintf(err_str, err_str_len-1, "Failed to add entry for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
        } else if (local_flags & LOCAL_DELETE_USER) {
                if (!pdb_delete_sam_account(sam_pass)) {
                        slprintf(err_str,err_str_len-1, "Failed to delete entry for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
                slprintf(msg_str, msg_str_len-1, "Deleted user %s.\n", user_name);
        } else {
                if(!pdb_update_sam_account(sam_pass)) {
                        slprintf(err_str, err_str_len-1, "Failed to modify entry for user %s.\n", user_name);
                        pdb_free_sam(&sam_pass);
                        return False;
                }
                if(local_flags & LOCAL_DISABLE_USER)
                        slprintf(msg_str, msg_str_len-1, "Disabled user %s.\n", user_name);
                else if (local_flags & LOCAL_ENABLE_USER)
                        slprintf(msg_str, msg_str_len-1, "Enabled user %s.\n", user_name);
                else if (local_flags & LOCAL_SET_NO_PASSWORD)
                        slprintf(msg_str, msg_str_len-1, "User %s password set to none.\n", user_name);
        }

        pdb_free_sam(&sam_pass);
        return True;
}

/****************************************************************************
 Convert a uid to SID - algorithmic.
****************************************************************************/

DOM_SID *algorithmic_uid_to_sid(DOM_SID *psid, uid_t uid)
{
        if ( !lp_enable_rid_algorithm() )
                return NULL;

        DEBUG(8,("algorithmic_uid_to_sid: falling back to RID algorithm\n"));
        sid_copy( psid, get_global_sam_sid() );
        sid_append_rid( psid, fallback_pdb_uid_to_user_rid(uid) );
        DEBUG(10,("algorithmic_uid_to_sid:  uid (%d) -> SID %s.\n",
                (unsigned int)uid, sid_string_static(psid) ));

        return psid;
}

/****************************************************************************
 Convert a uid to SID - locally.
****************************************************************************/

DOM_SID *local_uid_to_sid(DOM_SID *psid, uid_t uid)
{
        SAM_ACCOUNT *sampw = NULL;
        struct passwd *unix_pw;
        BOOL ret;
        
        unix_pw = sys_getpwuid( uid );

        if ( !unix_pw ) {
                DEBUG(4,("local_uid_to_sid: host has no idea of uid %lu\n", (unsigned long)uid));
                return algorithmic_uid_to_sid( psid, uid);
        }
        
        if ( !NT_STATUS_IS_OK(pdb_init_sam(&sampw)) ) {
                DEBUG(0,("local_uid_to_sid: failed to allocate SAM_ACCOUNT object\n"));
                return NULL;
        }
        
        become_root();
        ret = pdb_getsampwnam( sampw, unix_pw->pw_name );
        unbecome_root();
        
        if ( ret )
                sid_copy( psid, pdb_get_user_sid(sampw) );
        else {
                DEBUG(4,("local_uid_to_sid: User %s [uid == %lu] has no samba account\n",
                        unix_pw->pw_name, (unsigned long)uid));

                return algorithmic_uid_to_sid( psid, uid);
        }

        DEBUG(10,("local_uid_to_sid:  uid (%d) -> SID %s (%s).\n", 
                (unsigned int)uid, sid_string_static(psid), unix_pw->pw_name));
        
        return psid;
}

/****************************************************************************
 Convert a SID to uid - locally.
****************************************************************************/

BOOL local_sid_to_uid(uid_t *puid, const DOM_SID *psid, enum SID_NAME_USE *name_type)
{
        SAM_ACCOUNT *sampw = NULL;      
        struct passwd *unix_pw;
        const char *user_name;

        *name_type = SID_NAME_UNKNOWN;

        /*
         * We can only convert to a uid if this is our local
         * Domain SID (ie. we are the controling authority).
         */
        if (!sid_check_is_in_our_domain(psid) ) {
                DEBUG(5,("local_sid_to_uid: this SID (%s) is not from our domain\n", sid_string_static(psid)));
                return False;
        }

        /* lookup the user account */
        
        if ( !NT_STATUS_IS_OK(pdb_init_sam(&sampw)) ) {
                DEBUG(0,("local_sid_to_uid: Failed to allocate memory for SAM_ACCOUNT object\n"));
                return False;
        }
                
        become_root();
        if ( !pdb_getsampwsid(sampw, psid) ) {
                unbecome_root();
                DEBUG(8,("local_sid_to_uid: Could not find SID %s in passdb\n",
                        sid_string_static(psid)));
                return False;
        }
        unbecome_root();
        
        user_name = pdb_get_username(sampw);

        unix_pw = sys_getpwnam( user_name );

        if ( !unix_pw ) {
                DEBUG(0,("local_sid_to_uid: %s found in passdb but getpwnam() return NULL!\n",
                        user_name));
                pdb_free_sam( &sampw );
                return False;
        }
                
        *puid = unix_pw->pw_uid;
        
        DEBUG(10,("local_sid_to_uid: SID %s -> uid (%u) (%s).\n", sid_string_static(psid),
                (unsigned int)*puid, user_name ));

        *name_type = SID_NAME_USER;
        
        return True;
}

/****************************************************************************
 Convert a gid to SID - algorithmic.
****************************************************************************/

DOM_SID *algorithmic_gid_to_sid(DOM_SID *psid, uid_t gid)
{
        if ( !lp_enable_rid_algorithm() )
                return NULL;

        DEBUG(8,("algorithmic_gid_to_sid: falling back to RID algorithm\n"));
        sid_copy( psid, get_global_sam_sid() );
        sid_append_rid( psid, pdb_gid_to_group_rid(gid) );
        DEBUG(10,("algorithmic_gid_to_sid:  gid (%d) -> SID %s.\n",
                (unsigned int)gid, sid_string_static(psid) ));

        return psid;
}

/****************************************************************************
 Convert a gid to SID - locally.
****************************************************************************/

DOM_SID *local_gid_to_sid(DOM_SID *psid, gid_t gid)
{
        GROUP_MAP group;
        BOOL ret;
        
        /* we don't need to disable winbindd since the gid is stored in 
           the GROUP_MAP object */
           
        /* done as root since ldap backend requires root to open a connection */

        become_root();
        ret = pdb_getgrgid( &group, gid );
        unbecome_root();
        
        if ( !ret ) {

                /* fallback to rid mapping if enabled */

                if ( lp_enable_rid_algorithm() ) {

                        DEBUG(10,("local_gid_to_sid: Fall back to algorithmic mapping: %u -> %s\n", 
                                (unsigned int)gid, sid_string_static(psid)));
                                
                        return algorithmic_gid_to_sid(psid, gid);
                }
                else
                        return NULL;
        }
        
        sid_copy( psid, &group.sid );
        
        DEBUG(10,("local_gid_to_sid:  gid (%d) -> SID %s.\n", 
                (unsigned int)gid, sid_string_static(psid)));   
        
        return psid;
}

/****************************************************************************
 Convert a SID to gid - locally.
****************************************************************************/

BOOL local_sid_to_gid(gid_t *pgid, const DOM_SID *psid, enum SID_NAME_USE *name_type)
{
        uint32 rid;
        GROUP_MAP group;
        BOOL ret;

        *name_type = SID_NAME_UNKNOWN;

        /* This call can enumerate group mappings for foreign sids as well.
           So don't check for a match against our domain SID */

        /* we don't need to disable winbindd since the gid is stored in 
           the GROUP_MAP object */
           
        become_root();
        ret = pdb_getgrsid(&group, *psid);
        unbecome_root();
        
        if ( !ret ) {

                /* fallback to rid mapping if enabled */

                if ( lp_enable_rid_algorithm() ) {

                        if (!sid_check_is_in_our_domain(psid) ) {
                                DEBUG(5,("local_sid_to_gid: RID algorithm only supported for our domain (%s is not)\n", sid_string_static(psid)));
                                return False;
                        }

                        if (!sid_peek_rid(psid, &rid)) {
                                DEBUG(10,("local_sid_to_gid: invalid SID!\n"));
                                        return False;
                        }

                        DEBUG(10,("local_sid_to_gid: Fall back to algorithmic mapping\n"));

                        if (fallback_pdb_rid_is_user(rid)) {
                                DEBUG(3, ("local_sid_to_gid: SID %s is *NOT* a group\n", sid_string_static(psid)));
                                return False;
                        } else {
                                *pgid = pdb_group_rid_to_gid(rid);
                                DEBUG(10,("local_sid_to_gid: mapping: %s -> %u\n", sid_string_static(psid), (unsigned int)(*pgid)));
                                return True;
                        }
                }
                
                return False;
        }

        *pgid = group.gid;

        DEBUG(10,("local_sid_to_gid: SID %s -> gid (%u)\n", sid_string_static(psid),
                (unsigned int)*pgid));

        return True;
}

/**********************************************************************
 Marshall/unmarshall SAM_ACCOUNT structs.
 *********************************************************************/

#define TDB_FORMAT_STRING_V0       "ddddddBBBBBBBBBBBBddBBwdwdBwwd"
#define TDB_FORMAT_STRING_V1       "dddddddBBBBBBBBBBBBddBBwdwdBwwd"

/**********************************************************************
 Intialize a SAM_ACCOUNT struct from a BYTE buffer of size len
 *********************************************************************/

BOOL init_sam_from_buffer(SAM_ACCOUNT *sampass, uint8 *buf, uint32 buflen)
{
        return(init_sam_from_buffer_v1(sampass, buf, buflen));
}

/**********************************************************************
 Intialize a BYTE buffer from a SAM_ACCOUNT struct
 *********************************************************************/

uint32 init_buffer_from_sam (uint8 **buf, const SAM_ACCOUNT *sampass, BOOL size_only)
{
        return(init_buffer_from_sam_v1(buf, sampass, size_only));
}


BOOL init_sam_from_buffer_v0(SAM_ACCOUNT *sampass, uint8 *buf, uint32 buflen)
{

        /* times are stored as 32bit integer
           take care on system with 64bit wide time_t
           --SSS */
        uint32  logon_time,
                logoff_time,
                kickoff_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time;
        char *username;
        char *domain;
        char *nt_username;
        char *dir_drive;
        char *unknown_str;
        char *munged_dial;
        char *fullname;
        char *homedir;
        char *logon_script;
        char *profile_path;
        char *acct_desc;
        char *workstations;
        uint32  username_len, domain_len, nt_username_len,
                dir_drive_len, unknown_str_len, munged_dial_len,
                fullname_len, homedir_len, logon_script_len,
                profile_path_len, acct_desc_len, workstations_len;
                
        uint32  user_rid, group_rid, remove_me, hours_len, unknown_6;
        uint16  acct_ctrl, logon_divs;
        uint16  bad_password_count, logon_count;
        uint8   *hours;
        static uint8    *lm_pw_ptr, *nt_pw_ptr;
        uint32          len = 0;
        uint32          lm_pw_len, nt_pw_len, hourslen;
        BOOL ret = True;
        
        if(sampass == NULL || buf == NULL) {
                DEBUG(0, ("init_sam_from_buffer: NULL parameters found!\n"));
                return False;
        }
                                                                        
        /* unpack the buffer into variables */
        len = tdb_unpack ((char *)buf, buflen, TDB_FORMAT_STRING_V0,
                &logon_time,
                &logoff_time,
                &kickoff_time,
                &pass_last_set_time,
                &pass_can_change_time,
                &pass_must_change_time,
                &username_len, &username,
                &domain_len, &domain,
                &nt_username_len, &nt_username,
                &fullname_len, &fullname,
                &homedir_len, &homedir,
                &dir_drive_len, &dir_drive,
                &logon_script_len, &logon_script,
                &profile_path_len, &profile_path,
                &acct_desc_len, &acct_desc,
                &workstations_len, &workstations,
                &unknown_str_len, &unknown_str,
                &munged_dial_len, &munged_dial,
                &user_rid,
                &group_rid,
                &lm_pw_len, &lm_pw_ptr,
                &nt_pw_len, &nt_pw_ptr,
                &acct_ctrl,
                &remove_me, /* remove on the next TDB_FORMAT upgarde */
                &logon_divs,
                &hours_len,
                &hourslen, &hours,
                &bad_password_count,
                &logon_count,
                &unknown_6);
                
        if (len == (uint32) -1)  {
                ret = False;
                goto done;
        }

        pdb_set_logon_time(sampass, logon_time, PDB_SET);
        pdb_set_logoff_time(sampass, logoff_time, PDB_SET);
        pdb_set_kickoff_time(sampass, kickoff_time, PDB_SET);
        pdb_set_pass_can_change_time(sampass, pass_can_change_time, PDB_SET);
        pdb_set_pass_must_change_time(sampass, pass_must_change_time, PDB_SET);
        pdb_set_pass_last_set_time(sampass, pass_last_set_time, PDB_SET);

        pdb_set_username(sampass, username, PDB_SET); 
        pdb_set_domain(sampass, domain, PDB_SET);
        pdb_set_nt_username(sampass, nt_username, PDB_SET);
        pdb_set_fullname(sampass, fullname, PDB_SET);

        if (homedir) {
                pdb_set_homedir(sampass, homedir, PDB_SET);
        }
        else {
                pdb_set_homedir(sampass, 
                        talloc_sub_basic(sampass->mem_ctx, username, lp_logon_home()),
                        PDB_DEFAULT);
        }

        if (dir_drive)  
                pdb_set_dir_drive(sampass, dir_drive, PDB_SET);
        else {
                pdb_set_dir_drive(sampass, 
                        talloc_sub_basic(sampass->mem_ctx,  username, lp_logon_drive()),
                        PDB_DEFAULT);
        }

        if (logon_script) 
                pdb_set_logon_script(sampass, logon_script, PDB_SET);
        else {
                pdb_set_logon_script(sampass, 
                        talloc_sub_basic(sampass->mem_ctx, username, lp_logon_script()),
                        PDB_DEFAULT);
        }
        
        if (profile_path) {     
                pdb_set_profile_path(sampass, profile_path, PDB_SET);
        } else {
                pdb_set_profile_path(sampass, 
                        talloc_sub_basic(sampass->mem_ctx, username, lp_logon_path()),
                        PDB_DEFAULT);
        }

        pdb_set_acct_desc(sampass, acct_desc, PDB_SET);
        pdb_set_workstations(sampass, workstations, PDB_SET);
        pdb_set_munged_dial(sampass, munged_dial, PDB_SET);

        if (lm_pw_ptr && lm_pw_len == LM_HASH_LEN) {
                if (!pdb_set_lanman_passwd(sampass, lm_pw_ptr, PDB_SET)) {
                        ret = False;
                        goto done;
                }
        }

        if (nt_pw_ptr && nt_pw_len == NT_HASH_LEN) {
                if (!pdb_set_nt_passwd(sampass, nt_pw_ptr, PDB_SET)) {
                        ret = False;
                        goto done;
                }
        }

        pdb_set_user_sid_from_rid(sampass, user_rid, PDB_SET);
        pdb_set_group_sid_from_rid(sampass, group_rid, PDB_SET);
        pdb_set_hours_len(sampass, hours_len, PDB_SET);
        pdb_set_bad_password_count(sampass, bad_password_count, PDB_SET);
        pdb_set_logon_count(sampass, logon_count, PDB_SET);
        pdb_set_unknown_6(sampass, unknown_6, PDB_SET);
        pdb_set_acct_ctrl(sampass, acct_ctrl, PDB_SET);
        pdb_set_logon_divs(sampass, logon_divs, PDB_SET);
        pdb_set_hours(sampass, hours, PDB_SET);

done:

        SAFE_FREE(username);
        SAFE_FREE(domain);
        SAFE_FREE(nt_username);
        SAFE_FREE(fullname);
        SAFE_FREE(homedir);
        SAFE_FREE(dir_drive);
        SAFE_FREE(logon_script);
        SAFE_FREE(profile_path);
        SAFE_FREE(acct_desc);
        SAFE_FREE(workstations);
        SAFE_FREE(munged_dial);
        SAFE_FREE(unknown_str);
        SAFE_FREE(hours);

        return ret;
}


uint32 init_buffer_from_sam_v0 (uint8 **buf, const SAM_ACCOUNT *sampass, BOOL size_only)
{
        size_t len, buflen;

        /* times are stored as 32bit integer
           take care on system with 64bit wide time_t
           --SSS */
        uint32  logon_time,
                logoff_time,
                kickoff_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time;

        uint32  user_rid, group_rid;

        const char *username;
        const char *domain;
        const char *nt_username;
        const char *dir_drive;
        const char *unknown_str;
        const char *munged_dial;
        const char *fullname;
        const char *homedir;
        const char *logon_script;
        const char *profile_path;
        const char *acct_desc;
        const char *workstations;
        uint32  username_len, domain_len, nt_username_len,
                dir_drive_len, unknown_str_len, munged_dial_len,
                fullname_len, homedir_len, logon_script_len,
                profile_path_len, acct_desc_len, workstations_len;

        const uint8 *lm_pw;
        const uint8 *nt_pw;
        uint32  lm_pw_len = 16;
        uint32  nt_pw_len = 16;

        /* do we have a valid SAM_ACCOUNT pointer? */
        if (sampass == NULL) {
                DEBUG(0, ("init_buffer_from_sam: SAM_ACCOUNT is NULL!\n"));
                return -1;
        }
        
        *buf = NULL;
        buflen = 0;

        logon_time = (uint32)pdb_get_logon_time(sampass);
        logoff_time = (uint32)pdb_get_logoff_time(sampass);
        kickoff_time = (uint32)pdb_get_kickoff_time(sampass);
        pass_can_change_time = (uint32)pdb_get_pass_can_change_time(sampass);
        pass_must_change_time = (uint32)pdb_get_pass_must_change_time(sampass);
        pass_last_set_time = (uint32)pdb_get_pass_last_set_time(sampass);

        user_rid = pdb_get_user_rid(sampass);
        group_rid = pdb_get_group_rid(sampass);

        username = pdb_get_username(sampass);
        if (username)
                username_len = strlen(username) +1;
        else
                username_len = 0;

        domain = pdb_get_domain(sampass);
        if (domain)
                domain_len = strlen(domain) +1;
        else
                domain_len = 0;

        nt_username = pdb_get_nt_username(sampass);
        if (nt_username)
                nt_username_len = strlen(nt_username) +1;
        else
                nt_username_len = 0;

        fullname = pdb_get_fullname(sampass);
        if (fullname)
                fullname_len = strlen(fullname) +1;
        else
                fullname_len = 0;

        /*
         * Only updates fields which have been set (not defaults from smb.conf)
         */

        if (!IS_SAM_DEFAULT(sampass, PDB_DRIVE)) 
                dir_drive = pdb_get_dir_drive(sampass);
        else
                dir_drive = NULL;
        if (dir_drive)
                dir_drive_len = strlen(dir_drive) +1;
        else
                dir_drive_len = 0;

        if (!IS_SAM_DEFAULT(sampass, PDB_SMBHOME))
                homedir = pdb_get_homedir(sampass);
        else
                homedir = NULL;
        if (homedir)
                homedir_len = strlen(homedir) +1;
        else
                homedir_len = 0;

        if (!IS_SAM_DEFAULT(sampass, PDB_LOGONSCRIPT))
                logon_script = pdb_get_logon_script(sampass);
        else
                logon_script = NULL;
        if (logon_script)
                logon_script_len = strlen(logon_script) +1;
        else
                logon_script_len = 0;

        if (!IS_SAM_DEFAULT(sampass, PDB_PROFILE))
                profile_path = pdb_get_profile_path(sampass);
        else
                profile_path = NULL;
        if (profile_path)
                profile_path_len = strlen(profile_path) +1;
        else
                profile_path_len = 0;
        
        lm_pw = pdb_get_lanman_passwd(sampass);
        if (!lm_pw)
                lm_pw_len = 0;
        
        nt_pw = pdb_get_nt_passwd(sampass);
        if (!nt_pw)
                nt_pw_len = 0;
                
        acct_desc = pdb_get_acct_desc(sampass);
        if (acct_desc)
                acct_desc_len = strlen(acct_desc) +1;
        else
                acct_desc_len = 0;

        workstations = pdb_get_workstations(sampass);
        if (workstations)
                workstations_len = strlen(workstations) +1;
        else
                workstations_len = 0;

        unknown_str = NULL;
        unknown_str_len = 0;

        munged_dial = pdb_get_munged_dial(sampass);
        if (munged_dial)
                munged_dial_len = strlen(munged_dial) +1;
        else
                munged_dial_len = 0;    
                
        /* one time to get the size needed */
        len = tdb_pack(NULL, 0,  TDB_FORMAT_STRING_V0,
                logon_time,
                logoff_time,
                kickoff_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time,
                username_len, username,
                domain_len, domain,
                nt_username_len, nt_username,
                fullname_len, fullname,
                homedir_len, homedir,
                dir_drive_len, dir_drive,
                logon_script_len, logon_script,
                profile_path_len, profile_path,
                acct_desc_len, acct_desc,
                workstations_len, workstations,
                unknown_str_len, unknown_str,
                munged_dial_len, munged_dial,
                user_rid,
                group_rid,
                lm_pw_len, lm_pw,
                nt_pw_len, nt_pw,
                pdb_get_acct_ctrl(sampass),
                0, /* was: fileds_present, to be removed on format change */
                pdb_get_logon_divs(sampass),
                pdb_get_hours_len(sampass),
                MAX_HOURS_LEN, pdb_get_hours(sampass),
                pdb_get_bad_password_count(sampass),
                pdb_get_logon_count(sampass),
                pdb_get_unknown_6(sampass));


        if (size_only)
                return buflen;

        /* malloc the space needed */
        if ( (*buf=(uint8*)malloc(len)) == NULL) {
                DEBUG(0,("init_buffer_from_sam: Unable to malloc() memory for buffer!\n"));
                return (-1);
        }
        
        /* now for the real call to tdb_pack() */
        buflen = tdb_pack((char *)*buf, len,  TDB_FORMAT_STRING_V0,
                logon_time,
                logoff_time,
                kickoff_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time,
                username_len, username,
                domain_len, domain,
                nt_username_len, nt_username,
                fullname_len, fullname,
                homedir_len, homedir,
                dir_drive_len, dir_drive,
                logon_script_len, logon_script,
                profile_path_len, profile_path,
                acct_desc_len, acct_desc,
                workstations_len, workstations,
                unknown_str_len, unknown_str,
                munged_dial_len, munged_dial,
                user_rid,
                group_rid,
                lm_pw_len, lm_pw,
                nt_pw_len, nt_pw,
                pdb_get_acct_ctrl(sampass),
                0, /* was: fileds_present, to be removed on format change */
                pdb_get_logon_divs(sampass),
                pdb_get_hours_len(sampass),
                MAX_HOURS_LEN, pdb_get_hours(sampass),
                pdb_get_bad_password_count(sampass),
                pdb_get_logon_count(sampass),
                pdb_get_unknown_6(sampass));
        
        
        /* check to make sure we got it correct */
        if (buflen != len) {
                DEBUG(0, ("init_buffer_from_sam: somthing odd is going on here: bufflen (%lu) != len (%lu) in tdb_pack operations!\n", 
                          (unsigned long)buflen, (unsigned long)len));  
                /* error */
                SAFE_FREE (*buf);
                return (-1);
        }

        return (buflen);
}


BOOL init_sam_from_buffer_v1(SAM_ACCOUNT *sampass, uint8 *buf, uint32 buflen)
{

        /* times are stored as 32bit integer
           take care on system with 64bit wide time_t
           --SSS */
        uint32  logon_time,
                logoff_time,
                kickoff_time,
                bad_password_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time;
        char *username;
        char *domain;
        char *nt_username;
        char *dir_drive;
        char *unknown_str;
        char *munged_dial;
        char *fullname;
        char *homedir;
        char *logon_script;
        char *profile_path;
        char *acct_desc;
        char *workstations;
        uint32  username_len, domain_len, nt_username_len,
                dir_drive_len, unknown_str_len, munged_dial_len,
                fullname_len, homedir_len, logon_script_len,
                profile_path_len, acct_desc_len, workstations_len;
                
        uint32  user_rid, group_rid, remove_me, hours_len, unknown_6;
        uint16  acct_ctrl, logon_divs;
        uint16  bad_password_count, logon_count;
        uint8   *hours;
        static uint8    *lm_pw_ptr, *nt_pw_ptr;
        uint32          len = 0;
        uint32          lm_pw_len, nt_pw_len, hourslen;
        BOOL ret = True;
        
        if(sampass == NULL || buf == NULL) {
                DEBUG(0, ("init_sam_from_buffer: NULL parameters found!\n"));
                return False;
        }
                                                                        
        /* unpack the buffer into variables */
        len = tdb_unpack ((char *)buf, buflen, TDB_FORMAT_STRING_V1,
                &logon_time,
                &logoff_time,
                &kickoff_time,
                &bad_password_time,
                &pass_last_set_time,
                &pass_can_change_time,
                &pass_must_change_time,
                &username_len, &username,
                &domain_len, &domain,
                &nt_username_len, &nt_username,
                &fullname_len, &fullname,
                &homedir_len, &homedir,
                &dir_drive_len, &dir_drive,
                &logon_script_len, &logon_script,
                &profile_path_len, &profile_path,
                &acct_desc_len, &acct_desc,
                &workstations_len, &workstations,
                &unknown_str_len, &unknown_str,
                &munged_dial_len, &munged_dial,
                &user_rid,
                &group_rid,
                &lm_pw_len, &lm_pw_ptr,
                &nt_pw_len, &nt_pw_ptr,
                &acct_ctrl,
                &remove_me,
                &logon_divs,
                &hours_len,
                &hourslen, &hours,
                &bad_password_count,
                &logon_count,
                &unknown_6);
                
        if (len == (uint32) -1)  {
                ret = False;
                goto done;
        }

        pdb_set_logon_time(sampass, logon_time, PDB_SET);
        pdb_set_logoff_time(sampass, logoff_time, PDB_SET);
        pdb_set_kickoff_time(sampass, kickoff_time, PDB_SET);
        pdb_set_bad_password_time(sampass, bad_password_time, PDB_SET);
        pdb_set_pass_can_change_time(sampass, pass_can_change_time, PDB_SET);
        pdb_set_pass_must_change_time(sampass, pass_must_change_time, PDB_SET);
        pdb_set_pass_last_set_time(sampass, pass_last_set_time, PDB_SET);

        pdb_set_username(sampass, username, PDB_SET); 
        pdb_set_domain(sampass, domain, PDB_SET);
        pdb_set_nt_username(sampass, nt_username, PDB_SET);
        pdb_set_fullname(sampass, fullname, PDB_SET);

        if (homedir) {
                pdb_set_homedir(sampass, homedir, PDB_SET);
        }
        else {
                pdb_set_homedir(sampass, 
                        talloc_sub_basic(sampass->mem_ctx, username, lp_logon_home()),
                        PDB_DEFAULT);
        }

        if (dir_drive)  
                pdb_set_dir_drive(sampass, dir_drive, PDB_SET);
        else {
                pdb_set_dir_drive(sampass, 
                        talloc_sub_basic(sampass->mem_ctx,  username, lp_logon_drive()),
                        PDB_DEFAULT);
        }

        if (logon_script) 
                pdb_set_logon_script(sampass, logon_script, PDB_SET);
        else {
                pdb_set_logon_script(sampass, 
                        talloc_sub_basic(sampass->mem_ctx, username, lp_logon_script()),
                        PDB_DEFAULT);
        }
        
        if (profile_path) {     
                pdb_set_profile_path(sampass, profile_path, PDB_SET);
        } else {
                pdb_set_profile_path(sampass, 
                        talloc_sub_basic(sampass->mem_ctx, username, lp_logon_path()),
                        PDB_DEFAULT);
        }

        pdb_set_acct_desc(sampass, acct_desc, PDB_SET);
        pdb_set_workstations(sampass, workstations, PDB_SET);
        pdb_set_munged_dial(sampass, munged_dial, PDB_SET);

        if (lm_pw_ptr && lm_pw_len == LM_HASH_LEN) {
                if (!pdb_set_lanman_passwd(sampass, lm_pw_ptr, PDB_SET)) {
                        ret = False;
                        goto done;
                }
        }

        if (nt_pw_ptr && nt_pw_len == NT_HASH_LEN) {
                if (!pdb_set_nt_passwd(sampass, nt_pw_ptr, PDB_SET)) {
                        ret = False;
                        goto done;
                }
        }

        pdb_set_user_sid_from_rid(sampass, user_rid, PDB_SET);
        pdb_set_group_sid_from_rid(sampass, group_rid, PDB_SET);
        pdb_set_hours_len(sampass, hours_len, PDB_SET);
        pdb_set_bad_password_count(sampass, bad_password_count, PDB_SET);
        pdb_set_logon_count(sampass, logon_count, PDB_SET);
        pdb_set_unknown_6(sampass, unknown_6, PDB_SET);
        pdb_set_acct_ctrl(sampass, acct_ctrl, PDB_SET);
        pdb_set_logon_divs(sampass, logon_divs, PDB_SET);
        pdb_set_hours(sampass, hours, PDB_SET);

done:

        SAFE_FREE(username);
        SAFE_FREE(domain);
        SAFE_FREE(nt_username);
        SAFE_FREE(fullname);
        SAFE_FREE(homedir);
        SAFE_FREE(dir_drive);
        SAFE_FREE(logon_script);
        SAFE_FREE(profile_path);
        SAFE_FREE(acct_desc);
        SAFE_FREE(workstations);
        SAFE_FREE(munged_dial);
        SAFE_FREE(unknown_str);
        SAFE_FREE(hours);

        return ret;
}


uint32 init_buffer_from_sam_v1 (uint8 **buf, const SAM_ACCOUNT *sampass, BOOL size_only)
{
        size_t len, buflen;

        /* times are stored as 32bit integer
           take care on system with 64bit wide time_t
           --SSS */
        uint32  logon_time,
                logoff_time,
                kickoff_time,
                bad_password_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time;

        uint32  user_rid, group_rid;

        const char *username;
        const char *domain;
        const char *nt_username;
        const char *dir_drive;
        const char *unknown_str;
        const char *munged_dial;
        const char *fullname;
        const char *homedir;
        const char *logon_script;
        const char *profile_path;
        const char *acct_desc;
        const char *workstations;
        uint32  username_len, domain_len, nt_username_len,
                dir_drive_len, unknown_str_len, munged_dial_len,
                fullname_len, homedir_len, logon_script_len,
                profile_path_len, acct_desc_len, workstations_len;

        const uint8 *lm_pw;
        const uint8 *nt_pw;
        uint32  lm_pw_len = 16;
        uint32  nt_pw_len = 16;

        /* do we have a valid SAM_ACCOUNT pointer? */
        if (sampass == NULL) {
                DEBUG(0, ("init_buffer_from_sam: SAM_ACCOUNT is NULL!\n"));
                return -1;
        }
        
        *buf = NULL;
        buflen = 0;

        logon_time = (uint32)pdb_get_logon_time(sampass);
        logoff_time = (uint32)pdb_get_logoff_time(sampass);
        kickoff_time = (uint32)pdb_get_kickoff_time(sampass);
        bad_password_time = (uint32)pdb_get_bad_password_time(sampass);
        pass_can_change_time = (uint32)pdb_get_pass_can_change_time(sampass);
        pass_must_change_time = (uint32)pdb_get_pass_must_change_time(sampass);
        pass_last_set_time = (uint32)pdb_get_pass_last_set_time(sampass);

        user_rid = pdb_get_user_rid(sampass);
        group_rid = pdb_get_group_rid(sampass);

        username = pdb_get_username(sampass);
        if (username)
                username_len = strlen(username) +1;
        else
                username_len = 0;

        domain = pdb_get_domain(sampass);
        if (domain)
                domain_len = strlen(domain) +1;
        else
                domain_len = 0;

        nt_username = pdb_get_nt_username(sampass);
        if (nt_username)
                nt_username_len = strlen(nt_username) +1;
        else
                nt_username_len = 0;

        fullname = pdb_get_fullname(sampass);
        if (fullname)
                fullname_len = strlen(fullname) +1;
        else
                fullname_len = 0;

        /*
         * Only updates fields which have been set (not defaults from smb.conf)
         */

        if (!IS_SAM_DEFAULT(sampass, PDB_DRIVE)) 
                dir_drive = pdb_get_dir_drive(sampass);
        else
                dir_drive = NULL;
        if (dir_drive)
                dir_drive_len = strlen(dir_drive) +1;
        else
                dir_drive_len = 0;

        if (!IS_SAM_DEFAULT(sampass, PDB_SMBHOME))
                homedir = pdb_get_homedir(sampass);
        else
                homedir = NULL;
        if (homedir)
                homedir_len = strlen(homedir) +1;
        else
                homedir_len = 0;

        if (!IS_SAM_DEFAULT(sampass, PDB_LOGONSCRIPT))
                logon_script = pdb_get_logon_script(sampass);
        else
                logon_script = NULL;
        if (logon_script)
                logon_script_len = strlen(logon_script) +1;
        else
                logon_script_len = 0;

        if (!IS_SAM_DEFAULT(sampass, PDB_PROFILE))
                profile_path = pdb_get_profile_path(sampass);
        else
                profile_path = NULL;
        if (profile_path)
                profile_path_len = strlen(profile_path) +1;
        else
                profile_path_len = 0;
        
        lm_pw = pdb_get_lanman_passwd(sampass);
        if (!lm_pw)
                lm_pw_len = 0;
        
        nt_pw = pdb_get_nt_passwd(sampass);
        if (!nt_pw)
                nt_pw_len = 0;
                
        acct_desc = pdb_get_acct_desc(sampass);
        if (acct_desc)
                acct_desc_len = strlen(acct_desc) +1;
        else
                acct_desc_len = 0;

        workstations = pdb_get_workstations(sampass);
        if (workstations)
                workstations_len = strlen(workstations) +1;
        else
                workstations_len = 0;

        unknown_str = NULL;
        unknown_str_len = 0;

        munged_dial = pdb_get_munged_dial(sampass);
        if (munged_dial)
                munged_dial_len = strlen(munged_dial) +1;
        else
                munged_dial_len = 0;    
                
        /* one time to get the size needed */
        len = tdb_pack(NULL, 0,  TDB_FORMAT_STRING_V1,
                logon_time,
                logoff_time,
                kickoff_time,
                bad_password_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time,
                username_len, username,
                domain_len, domain,
                nt_username_len, nt_username,
                fullname_len, fullname,
                homedir_len, homedir,
                dir_drive_len, dir_drive,
                logon_script_len, logon_script,
                profile_path_len, profile_path,
                acct_desc_len, acct_desc,
                workstations_len, workstations,
                unknown_str_len, unknown_str,
                munged_dial_len, munged_dial,
                user_rid,
                group_rid,
                lm_pw_len, lm_pw,
                nt_pw_len, nt_pw,
                pdb_get_acct_ctrl(sampass),
                0,
                pdb_get_logon_divs(sampass),
                pdb_get_hours_len(sampass),
                MAX_HOURS_LEN, pdb_get_hours(sampass),
                pdb_get_bad_password_count(sampass),
                pdb_get_logon_count(sampass),
                pdb_get_unknown_6(sampass));


        if (size_only)
                return buflen;

        /* malloc the space needed */
        if ( (*buf=(uint8*)malloc(len)) == NULL) {
                DEBUG(0,("init_buffer_from_sam: Unable to malloc() memory for buffer!\n"));
                return (-1);
        }
        
        /* now for the real call to tdb_pack() */
        buflen = tdb_pack((char *)*buf, len,  TDB_FORMAT_STRING_V1,
                logon_time,
                logoff_time,
                kickoff_time,
                bad_password_time,
                pass_last_set_time,
                pass_can_change_time,
                pass_must_change_time,
                username_len, username,
                domain_len, domain,
                nt_username_len, nt_username,
                fullname_len, fullname,
                homedir_len, homedir,
                dir_drive_len, dir_drive,
                logon_script_len, logon_script,
                profile_path_len, profile_path,
                acct_desc_len, acct_desc,
                workstations_len, workstations,
                unknown_str_len, unknown_str,
                munged_dial_len, munged_dial,
                user_rid,
                group_rid,
                lm_pw_len, lm_pw,
                nt_pw_len, nt_pw,
                pdb_get_acct_ctrl(sampass),
                0,
                pdb_get_logon_divs(sampass),
                pdb_get_hours_len(sampass),
                MAX_HOURS_LEN, pdb_get_hours(sampass),
                pdb_get_bad_password_count(sampass),
                pdb_get_logon_count(sampass),
                pdb_get_unknown_6(sampass));
        
        
        /* check to make sure we got it correct */
        if (buflen != len) {
                DEBUG(0, ("init_buffer_from_sam: somthing odd is going on here: bufflen (%lu) != len (%lu) in tdb_pack operations!\n", 
                          (unsigned long)buflen, (unsigned long)len));  
                /* error */
                SAFE_FREE (*buf);
                return (-1);
        }

        return (buflen);
}


/**********************************************************************
**********************************************************************/

static BOOL get_free_ugid_range(uint32 *low, uint32 *high)
{
        uid_t u_low, u_high;
        gid_t g_low, g_high;

        if (!lp_idmap_uid(&u_low, &u_high) || !lp_idmap_gid(&g_low, &g_high)) {
                return False;
        }
        
        *low  = (u_low < g_low)   ? u_low  : g_low;
        *high = (u_high < g_high) ? u_high : g_high;
        
        return True;
}

/******************************************************************
 Get the the non-algorithmic RID range if idmap range are defined
******************************************************************/

BOOL get_free_rid_range(uint32 *low, uint32 *high)
{
        uint32 id_low, id_high;

        if (!lp_enable_rid_algorithm()) {
                *low = BASE_RID;
                *high = (uint32)-1;
        }

        if (!get_free_ugid_range(&id_low, &id_high)) {
                return False;
        }

        *low = fallback_pdb_uid_to_user_rid(id_low);
        if (fallback_pdb_user_rid_to_uid((uint32)-1) < id_high) {
                *high = (uint32)-1;
        } else {
                *high = fallback_pdb_uid_to_user_rid(id_high);
        }

        return True;
}

/*********************************************************************
 Update the bad password count checking the AP_RESET_COUNT_TIME 
*********************************************************************/

BOOL pdb_update_bad_password_count(SAM_ACCOUNT *sampass, BOOL *updated)
{
        time_t LastBadPassword;
        uint16 BadPasswordCount;
        uint32 resettime; 

        if (!sampass) return False;
        
        BadPasswordCount = pdb_get_bad_password_count(sampass);
        if (!BadPasswordCount) {
                DEBUG(9, ("No bad password attempts.\n"));
                return True;
        }

        if (!account_policy_get(AP_RESET_COUNT_TIME, &resettime)) {
                DEBUG(0, ("pdb_update_bad_password_count: account_policy_get failed.\n"));
                return False;
        }

        /* First, check if there is a reset time to compare */
        if ((resettime == (uint32) -1) || (resettime == 0)) {
                DEBUG(9, ("No reset time, can't reset bad pw count\n"));
                return True;
        }

        LastBadPassword = pdb_get_bad_password_time(sampass);
        DEBUG(7, ("LastBadPassword=%d, resettime=%d, current time=%d.\n", 
                   (uint32) LastBadPassword, resettime, (uint32)time(NULL)));
        if (time(NULL) > (LastBadPassword + (time_t)resettime*60)){
                pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
                pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
                if (updated) *updated = True;
        }

        return True;
}

/*********************************************************************
 Update the ACB_AUTOLOCK flag checking the AP_LOCK_ACCOUNT_DURATION 
*********************************************************************/

BOOL pdb_update_autolock_flag(SAM_ACCOUNT *sampass, BOOL *updated)
{
        uint32 duration;
        time_t LastBadPassword;

        if (!sampass) return False;
 
        if (!(pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK)) {
                DEBUG(9, ("Account not autolocked, no check needed\n"));
                return True;
        }

        if (!account_policy_get(AP_LOCK_ACCOUNT_DURATION, &duration)) {
                DEBUG(0, ("pdb_update_autolock_flag: account_policy_get failed.\n"));
                return False;
        }

        /* First, check if there is a duration to compare */
        if ((duration == (uint32) -1)  || (duration == 0)) {
                DEBUG(9, ("No reset duration, can't reset autolock\n"));
                return True;
        }
                      
        LastBadPassword = pdb_get_bad_password_time(sampass);
        DEBUG(7, ("LastBadPassword=%d, duration=%d, current time =%d.\n",
                  (uint32)LastBadPassword, duration*60, (uint32)time(NULL)));
        if ((time(NULL) > (LastBadPassword + (time_t) duration * 60))) {
                pdb_set_acct_ctrl(sampass,
                                  pdb_get_acct_ctrl(sampass) & ~ACB_AUTOLOCK,
                                  PDB_CHANGED);
                pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
                pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
                if (updated) *updated = True;
        }
        
        return True;
}

/*********************************************************************
 Increment the bad_password_count 
*********************************************************************/

BOOL pdb_increment_bad_password_count(SAM_ACCOUNT *sampass)
{
        uint32 account_policy_lockout;
        BOOL autolock_updated = False, badpw_updated = False;

        if (!sampass)
                return False;

        /* Retrieve the account lockout policy */
        if (!account_policy_get(AP_BAD_ATTEMPT_LOCKOUT,
                                &account_policy_lockout)) {
                DEBUG(0, ("pdb_increment_bad_password_count: account_policy_get failed.\n"));
                return False;
        }

        /* If there is no policy, we don't need to continue checking */
        if (!account_policy_lockout) {
                DEBUG(9, ("No lockout policy, don't track bad passwords\n"));
                return True;
        }

        /* Check if the autolock needs to be cleared */
        if (!pdb_update_autolock_flag(sampass, &autolock_updated))
                return False;

        /* Check if the badpw count needs to be reset */
        if (!pdb_update_bad_password_count(sampass, &badpw_updated))
                return False;

        /*
          Ok, now we can assume that any resetting that needs to be 
          done has been done, and just get on with incrementing
          and autolocking if necessary
        */

        pdb_set_bad_password_count(sampass, 
                                   pdb_get_bad_password_count(sampass)+1,
                                   PDB_CHANGED);
        pdb_set_bad_password_time(sampass, time(NULL), PDB_CHANGED);


        if (pdb_get_bad_password_count(sampass) < account_policy_lockout) 
                return True;

        if (!pdb_set_acct_ctrl(sampass,
                               pdb_get_acct_ctrl(sampass) | ACB_AUTOLOCK,
                               PDB_CHANGED)) {
                DEBUG(1, ("pdb_increment_bad_password_count:failed to set 'autolock' flag. \n")); 
                return False;
        }

        return True;
}