source: trunk/server/source3/passdb/passdb.c@ 643

/* 
   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          2000-2006
   Copyright (C) Andrew Bartlett                2001-2002
   Copyright (C) Simo Sorce                     2003
   Copyright (C) Volker Lendecke                2006

   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 3 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, see <http://www.gnu.org/licenses/>.
*/

#include "includes.h"
#include "../libcli/auth/libcli_auth.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB

/******************************************************************
 Get the default domain/netbios name to be used when
 testing authentication.

 LEGACY: this function provides the legacy domain mapping used with
         the lp_map_untrusted_to_domain() parameter
******************************************************************/

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

       /* Default to the DOMAIN name when not specified */
       return lp_workgroup();
}

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

static int samu_destroy(struct samu *user) 
{
        data_blob_clear_free( &user->lm_pw );
        data_blob_clear_free( &user->nt_pw );

        if ( user->plaintext_pw )
                memset( user->plaintext_pw, 0x0, strlen(user->plaintext_pw) );

        return 0;
}

/**********************************************************************
 generate a new struct samuser
***********************************************************************/

struct samu *samu_new( TALLOC_CTX *ctx )
{
        struct samu *user;

        if ( !(user = TALLOC_ZERO_P( ctx, struct samu )) ) {
                DEBUG(0,("samuser_new: Talloc failed!\n"));
                return NULL;
        }

        talloc_set_destructor( user, samu_destroy );

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

        /* Some parts of samba strlen their pdb_get...() returns, 
           so this keeps the interface unchanged for now. */

        user->username = "";
        user->domain = "";
        user->nt_username = "";
        user->full_name = "";
        user->home_dir = "";
        user->logon_script = "";
        user->profile_path = "";
        user->acct_desc = "";
        user->workstations = "";
        user->comment = "";
        user->munged_dial = "";

        user->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->acct_ctrl = ACB_NORMAL;

        return user;
}

static int count_commas(const char *str)
{
        int num_commas = 0;
        const char *comma = str;

        while ((comma = strchr(comma, ',')) != NULL) {
                comma += 1;
                num_commas += 1;
        }
        return num_commas;
}

/*********************************************************************
 Initialize a struct samu from a struct passwd including the user 
 and group SIDs.  The *user structure is filled out with the Unix
 attributes and a user SID.
*********************************************************************/

static NTSTATUS samu_set_unix_internal(struct samu *user, const struct passwd *pwd, bool create)
{
        const char *guest_account = lp_guestaccount();
        const char *domain = global_myname();
        char *fullname;
        uint32 urid;

        if ( !pwd ) {
                return NT_STATUS_NO_SUCH_USER;
        }

        /* Basic properties based upon the Unix account information */

        pdb_set_username(user, pwd->pw_name, PDB_SET);

        fullname = NULL;

        if (count_commas(pwd->pw_gecos) == 3) {
                /*
                 * Heuristic: This seems to be a gecos field that has been
                 * edited by chfn(1). Only use the part before the first
                 * comma. Fixes bug 5198.
                 */
                fullname = talloc_strndup(
                        talloc_tos(), pwd->pw_gecos,
                        strchr(pwd->pw_gecos, ',') - pwd->pw_gecos);
        }

        if (fullname != NULL) {
                pdb_set_fullname(user, fullname, PDB_SET);
        } else {
                pdb_set_fullname(user, pwd->pw_gecos, PDB_SET);
        }
        TALLOC_FREE(fullname);

        pdb_set_domain (user, get_global_sam_name(), PDB_DEFAULT);
#if 0
        /* This can lead to a primary group of S-1-22-2-XX which 
           will be rejected by other parts of the Samba code. 
           Rely on pdb_get_group_sid() to "Do The Right Thing" (TM)  
           --jerry */

        gid_to_sid(&group_sid, pwd->pw_gid);
        pdb_set_group_sid(user, &group_sid, PDB_SET);
#endif

        /* save the password structure for later use */

        user->unix_pw = tcopy_passwd( user, pwd );

        /* Special case for the guest account which must have a RID of 501 */

        if ( strequal( pwd->pw_name, guest_account ) ) {
                if ( !pdb_set_user_sid_from_rid(user, DOMAIN_USER_RID_GUEST, PDB_DEFAULT)) {
                        return NT_STATUS_NO_SUCH_USER;
                }
                return NT_STATUS_OK;
        }

        /* Non-guest accounts...Check for a workstation or user account */

        if (pwd->pw_name[strlen(pwd->pw_name)-1] == '$') {
                /* workstation */

                if (!pdb_set_acct_ctrl(user, ACB_WSTRUST, PDB_DEFAULT)) {
                        DEBUG(1, ("Failed to set 'workstation account' flags for user %s.\n", 
                                pwd->pw_name));
                        return NT_STATUS_INVALID_COMPUTER_NAME;
                }       
        } 
        else {
                /* user */

                if (!pdb_set_acct_ctrl(user, ACB_NORMAL, PDB_DEFAULT)) {
                        DEBUG(1, ("Failed to set 'normal account' flags for user %s.\n", 
                                pwd->pw_name));
                        return NT_STATUS_INVALID_ACCOUNT_NAME;
                }

                /* set some basic attributes */

                pdb_set_profile_path(user, talloc_sub_specified(user, 
                        lp_logon_path(), pwd->pw_name, domain, pwd->pw_uid, pwd->pw_gid), 
                        PDB_DEFAULT);           
                pdb_set_homedir(user, talloc_sub_specified(user, 
                        lp_logon_home(), pwd->pw_name, domain, pwd->pw_uid, pwd->pw_gid),
                        PDB_DEFAULT);
                pdb_set_dir_drive(user, talloc_sub_specified(user, 
                        lp_logon_drive(), pwd->pw_name, domain, pwd->pw_uid, pwd->pw_gid),
                        PDB_DEFAULT);
                pdb_set_logon_script(user, talloc_sub_specified(user, 
                        lp_logon_script(), pwd->pw_name, domain, pwd->pw_uid, pwd->pw_gid), 
                        PDB_DEFAULT);
        }

        /* Now deal with the user SID.  If we have a backend that can generate 
           RIDs, then do so.  But sometimes the caller just wanted a structure 
           initialized and will fill in these fields later (such as from a 
           netr_SamInfo3 structure) */

        if ( create && (pdb_capabilities() & PDB_CAP_STORE_RIDS)) {
                uint32 user_rid;
                DOM_SID user_sid;

                if ( !pdb_new_rid( &user_rid ) ) {
                        DEBUG(3, ("Could not allocate a new RID\n"));
                        return NT_STATUS_ACCESS_DENIED;
                }

                sid_copy( &user_sid, get_global_sam_sid() );
                sid_append_rid( &user_sid, user_rid );

                if ( !pdb_set_user_sid(user, &user_sid, PDB_SET) ) {
                        DEBUG(3, ("pdb_set_user_sid failed\n"));
                        return NT_STATUS_INTERNAL_ERROR;
                }

                return NT_STATUS_OK;
        }

        /* generate a SID for the user with the RID algorithm */

        urid = algorithmic_pdb_uid_to_user_rid( user->unix_pw->pw_uid );

        if ( !pdb_set_user_sid_from_rid( user, urid, PDB_SET) ) {
                return NT_STATUS_INTERNAL_ERROR;
        }

        return NT_STATUS_OK;
}

/********************************************************************
 Set the Unix user attributes
********************************************************************/

NTSTATUS samu_set_unix(struct samu *user, const struct passwd *pwd)
{
        return samu_set_unix_internal( user, pwd, False );
}

NTSTATUS samu_alloc_rid_unix(struct samu *user, const struct passwd *pwd)
{
        return samu_set_unix_internal( user, pwd, True );
}

/**********************************************************
 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(uint32_t acct_ctrl, size_t length)
{
        fstring acct_str;
        char *result;

        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';

        result = talloc_strdup(talloc_tos(), acct_str);
        SMB_ASSERT(result != NULL);
        return result;
}     

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

uint32_t pdb_decode_acct_ctrl(const char *p)
{
        uint32_t 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[33], const unsigned char *pwd, uint32 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", 32);
                else
                        safe_strcpy(p, "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", 32);
        }
}

/*************************************************************
 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_ascii(p[i]);
                lonybble = toupper_ascii(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;
}

/*************************************************************
 Routine to set 42 hex hours characters from a 21 byte array.
**************************************************************/

void pdb_sethexhours(char *p, const unsigned char *hours)
{
        if (hours != NULL) {
                int i;
                for (i = 0; i < 21; i++) {
                        slprintf(&p[i*2], 3, "%02X", hours[i]);
                }
        } else {
                safe_strcpy(p, "FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF", 43);
        }
}

/*************************************************************
 Routine to get the 42 hex characters and turn them
 into a 21 byte array.
**************************************************************/

bool pdb_gethexhours(const char *p, unsigned char *hours)
{
        int i;
        unsigned char   lonybble, hinybble;
        const char      *hexchars = "0123456789ABCDEF";
        char           *p1, *p2;

        if (!p) {
                return (False);
        }

        for (i = 0; i < 42; i += 2) {
                hinybble = toupper_ascii(p[i]);
                lonybble = toupper_ascii(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);

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

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

int algorithmic_rid_base(void)
{
        int 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 algorithmic_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);
}

uid_t max_algorithmic_uid(void)
{
        return algorithmic_pdb_user_rid_to_uid(0xfffffffe);
}

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

uint32 algorithmic_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);
}

gid_t max_algorithmic_gid(void)
{
        return pdb_group_rid_to_gid(0xffffffff);
}

/*******************************************************************
 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 algorithmic_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 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 algorithmic_pdb_rid_is_user(uint32 rid)
{
        if ( 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 name into a SID. Used in the lookup name rpc.
 ********************************************************************/

bool lookup_global_sam_name(const char *name, int flags, uint32_t *rid,
                            enum lsa_SidType *type)
{
        GROUP_MAP map;
        bool ret;

        /* Windows treats "MACHINE\None" as a special name for 
           rid 513 on non-DCs.  You cannot create a user or group
           name "None" on Windows.  You will get an error that 
           the group already exists. */

        if ( strequal( name, "None" ) ) {
                *rid = DOMAIN_GROUP_RID_USERS;
                *type = SID_NAME_DOM_GRP;

                return True;
        }

        /* LOOKUP_NAME_GROUP is a hack to allow valid users = @foo to work
         * correctly in the case where foo also exists as a user. If the flag
         * is set, don't look for users at all. */

        if ((flags & LOOKUP_NAME_GROUP) == 0) {
                struct samu *sam_account = NULL;
                DOM_SID user_sid;

                if ( !(sam_account = samu_new( NULL )) ) {
                        return False;
                }

                become_root();
                ret =  pdb_getsampwnam(sam_account, name);
                unbecome_root();

                if (ret) {
                        sid_copy(&user_sid, pdb_get_user_sid(sam_account));
                }

                TALLOC_FREE(sam_account);

                if (ret) {
                        if (!sid_check_is_in_our_domain(&user_sid)) {
                                DEBUG(0, ("User %s with invalid SID %s in passdb\n",
                                          name, sid_string_dbg(&user_sid)));
                                return False;
                        }

                        sid_peek_rid(&user_sid, rid);
                        *type = SID_NAME_USER;
                        return True;
                }
        }

        /*
         * Maybe it is a group ?
         */

        become_root();
        ret = pdb_getgrnam(&map, name);
        unbecome_root();

        if (!ret) {
                return False;
        }

        /* BUILTIN groups are looked up elsewhere */
        if (!sid_check_is_in_our_domain(&map.sid)) {
                DEBUG(10, ("Found group %s (%s) not in our domain -- "
                           "ignoring.", name, sid_string_dbg(&map.sid)));
                return False;
        }

        /* yes it's a mapped group */
        sid_peek_rid(&map.sid, rid);
        *type = map.sid_name_use;
        return True;
}

/*************************************************************
 Change a password entry in the local passdb backend.

 Assumptions:
  - always called as root
  - ignores the account type except when adding a new account
  - will create/delete the unix account if the relative
    add/delete user script is configured

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

NTSTATUS local_password_change(const char *user_name,
                                int local_flags,
                                const char *new_passwd, 
                                char **pp_err_str,
                                char **pp_msg_str)
{
        TALLOC_CTX *tosctx;
        struct samu *sam_pass;
        uint32_t acb;
        uint32_t rid;
        NTSTATUS result;
        bool user_exists;
        int ret = -1;

        *pp_err_str = NULL;
        *pp_msg_str = NULL;

        tosctx = talloc_tos();

        sam_pass = samu_new(tosctx);
        if (!sam_pass) {
                result = NT_STATUS_NO_MEMORY;
                goto done;
        }

        /* Get the smb passwd entry for this user */
        user_exists = pdb_getsampwnam(sam_pass, user_name);

        /* Check delete first, we don't need to do anything else if we
         * are going to delete the acocunt */
        if (user_exists && (local_flags & LOCAL_DELETE_USER)) {

                result = pdb_delete_user(tosctx, sam_pass);
                if (!NT_STATUS_IS_OK(result)) {
                        ret = asprintf(pp_err_str,
                                        "Failed to delete entry for user %s.\n",
                                        user_name);
                        if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                } else {
                        ret = asprintf(pp_msg_str,
                                        "Deleted user %s.\n",
                                        user_name);
                        if (ret < 0) {
                                *pp_msg_str = NULL;
                        }
                }
                goto done;
        }

        if (user_exists && (local_flags & LOCAL_ADD_USER)) {
                /* the entry already existed */
                local_flags &= ~LOCAL_ADD_USER;
        }

        if (!user_exists && !(local_flags & LOCAL_ADD_USER)) {
                ret = asprintf(pp_err_str,
                                "Failed to find entry for user %s.\n",
                                user_name);
                if (ret < 0) {
                        *pp_err_str = NULL;
                }
                result = NT_STATUS_NO_SUCH_USER;
                goto done;
        }

        /* First thing add the new user if we are required to do so */
        if (local_flags & LOCAL_ADD_USER) {

                if (local_flags & LOCAL_TRUST_ACCOUNT) {
                        acb = ACB_WSTRUST;
                } else if (local_flags & LOCAL_INTERDOM_ACCOUNT) {
                        acb = ACB_DOMTRUST;
                } else {
                        acb = ACB_NORMAL;
                }

                result = pdb_create_user(tosctx, user_name, acb, &rid);
                if (!NT_STATUS_IS_OK(result)) {
                        ret = asprintf(pp_err_str,
                                        "Failed to add entry for user %s.\n",
                                        user_name);
                        if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }

                sam_pass = samu_new(tosctx);
                if (!sam_pass) {
                        result = NT_STATUS_NO_MEMORY;
                        goto done;
                }

                /* Now get back the smb passwd entry for this new user */
                user_exists = pdb_getsampwnam(sam_pass, user_name);
                if (!user_exists) {
                        ret = asprintf(pp_err_str,
                                        "Failed to add entry for user %s.\n",
                                        user_name);
                        if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
        }

        acb = pdb_get_acct_ctrl(sam_pass);

        /*
         * We are root - just write the new password
         * and the valid last change time.
         */
        if ((local_flags & LOCAL_SET_NO_PASSWORD) && !(acb & ACB_PWNOTREQ)) {
                acb |= ACB_PWNOTREQ;
                if (!pdb_set_acct_ctrl(sam_pass, acb, PDB_CHANGED)) {
                        ret = asprintf(pp_err_str,
                                        "Failed to set 'no password required' "
                                        "flag for user %s.\n", user_name);
                        if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
        }

        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) &&
                    (acb & ACB_DISABLED)) {
                        acb &= (~ACB_DISABLED);
                        if (!pdb_set_acct_ctrl(sam_pass, acb, PDB_CHANGED)) {
                                ret = asprintf(pp_err_str,
                                                "Failed to unset 'disabled' "
                                                "flag for user %s.\n",
                                                user_name);
                                if (ret < 0) {
                                        *pp_err_str = NULL;
                                }
                                result = NT_STATUS_UNSUCCESSFUL;
                                goto done;
                        }
                }

                acb &= (~ACB_PWNOTREQ);
                if (!pdb_set_acct_ctrl(sam_pass, acb, PDB_CHANGED)) {
                        ret = asprintf(pp_err_str,
                                        "Failed to unset 'no password required'"
                                        " flag for user %s.\n", user_name);
                        if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }

                if (!pdb_set_plaintext_passwd(sam_pass, new_passwd)) {
                        ret = asprintf(pp_err_str,
                                        "Failed to set password for "
                                        "user %s.\n", user_name);
                                if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
        }

        if ((local_flags & LOCAL_DISABLE_USER) && !(acb & ACB_DISABLED)) {
                acb |= ACB_DISABLED;
                if (!pdb_set_acct_ctrl(sam_pass, acb, PDB_CHANGED)) {
                        ret = asprintf(pp_err_str,
                                        "Failed to set 'disabled' flag for "
                                        "user %s.\n", user_name);
                        if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
        }

        if ((local_flags & LOCAL_ENABLE_USER) && (acb & ACB_DISABLED)) {
                acb &= (~ACB_DISABLED);
                if (!pdb_set_acct_ctrl(sam_pass, acb, PDB_CHANGED)) {
                        ret = asprintf(pp_err_str,
                                        "Failed to unset 'disabled' flag for "
                                        "user %s.\n", user_name);
                        if (ret < 0) {
                                *pp_err_str = NULL;
                        }
                        result = NT_STATUS_UNSUCCESSFUL;
                        goto done;
                }
        }

        /* now commit changes if any */
        result = pdb_update_sam_account(sam_pass);
        if (!NT_STATUS_IS_OK(result)) {
                ret = asprintf(pp_err_str,
                                "Failed to modify entry for user %s.\n",
                                user_name);
                if (ret < 0) {
                        *pp_err_str = NULL;
                }
                goto done;
        }

        if (local_flags & LOCAL_ADD_USER) {
                ret = asprintf(pp_msg_str, "Added user %s.\n", user_name);
        } else if (local_flags & LOCAL_DISABLE_USER) {
                ret = asprintf(pp_msg_str, "Disabled user %s.\n", user_name);
        } else if (local_flags & LOCAL_ENABLE_USER) {
                ret = asprintf(pp_msg_str, "Enabled user %s.\n", user_name);
        } else if (local_flags & LOCAL_SET_NO_PASSWORD) {
                ret = asprintf(pp_msg_str,
                                "User %s password set to none.\n", user_name);
        }

        if (ret < 0) {
                *pp_msg_str = NULL;
        }

        result = NT_STATUS_OK;

done:
        TALLOC_FREE(sam_pass);
        return result;
}

/**********************************************************************
 Marshall/unmarshall struct samu structs.
 *********************************************************************/

#define SAMU_BUFFER_FORMAT_V0       "ddddddBBBBBBBBBBBBddBBwdwdBwwd"
#define SAMU_BUFFER_FORMAT_V1       "dddddddBBBBBBBBBBBBddBBwdwdBwwd"
#define SAMU_BUFFER_FORMAT_V2       "dddddddBBBBBBBBBBBBddBBBwwdBwwd"
#define SAMU_BUFFER_FORMAT_V3       "dddddddBBBBBBBBBBBBddBBBdwdBwwd"
/* nothing changed between V3 and V4 */

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

static bool init_samu_from_buffer_v0(struct samu *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 = NULL;
        char *domain = NULL;
        char *nt_username = NULL;
        char *dir_drive = NULL;
        char *unknown_str = NULL;
        char *munged_dial = NULL;
        char *fullname = NULL;
        char *homedir = NULL;
        char *logon_script = NULL;
        char *profile_path = NULL;
        char *acct_desc = NULL;
        char *workstations = NULL;
        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 = NULL;
        uint8   *lm_pw_ptr = NULL, *nt_pw_ptr = NULL;
        uint32          len = 0;
        uint32          lm_pw_len, nt_pw_len, hourslen;
        bool ret = True;

        if(sampass == NULL || buf == NULL) {
                DEBUG(0, ("init_samu_from_buffer_v0: NULL parameters found!\n"));
                return False;
        }

/* SAMU_BUFFER_FORMAT_V0       "ddddddBBBBBBBBBBBBddBBwdwdBwwd" */

        /* unpack the buffer into variables */
        len = tdb_unpack (buf, buflen, SAMU_BUFFER_FORMAT_V0,
                &logon_time,                                            /* d */
                &logoff_time,                                           /* d */
                &kickoff_time,                                          /* d */
                &pass_last_set_time,                                    /* d */
                &pass_can_change_time,                                  /* d */
                &pass_must_change_time,                                 /* d */
                &username_len, &username,                               /* B */
                &domain_len, &domain,                                   /* B */
                &nt_username_len, &nt_username,                         /* B */
                &fullname_len, &fullname,                               /* B */
                &homedir_len, &homedir,                                 /* B */
                &dir_drive_len, &dir_drive,                             /* B */
                &logon_script_len, &logon_script,                       /* B */
                &profile_path_len, &profile_path,                       /* B */
                &acct_desc_len, &acct_desc,                             /* B */
                &workstations_len, &workstations,                       /* B */
                &unknown_str_len, &unknown_str,                         /* B */
                &munged_dial_len, &munged_dial,                         /* B */
                &user_rid,                                              /* d */
                &group_rid,                                             /* d */
                &lm_pw_len, &lm_pw_ptr,                                 /* B */
                &nt_pw_len, &nt_pw_ptr,                                 /* B */
                &acct_ctrl,                                             /* w */
                &remove_me, /* remove on the next TDB_FORMAT upgarde */ /* d */
                &logon_divs,                                            /* w */
                &hours_len,                                             /* d */
                &hourslen, &hours,                                      /* B */
                &bad_password_count,                                    /* w */
                &logon_count,                                           /* w */
                &unknown_6);                                            /* d */

        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, username, domain,
                                         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, username, domain,
                                         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, username, domain,
                                         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, username, domain,
                                         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_pw_history(sampass, NULL, 0, PDB_SET);
        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(lm_pw_ptr);
        SAFE_FREE(nt_pw_ptr);
        SAFE_FREE(hours);

        return ret;
}

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

static bool init_samu_from_buffer_v1(struct samu *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 = NULL;
        char *domain = NULL;
        char *nt_username = NULL;
        char *dir_drive = NULL;
        char *unknown_str = NULL;
        char *munged_dial = NULL;
        char *fullname = NULL;
        char *homedir = NULL;
        char *logon_script = NULL;
        char *profile_path = NULL;
        char *acct_desc = NULL;
        char *workstations = NULL;
        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 = NULL;
        uint8   *lm_pw_ptr = NULL, *nt_pw_ptr = NULL;
        uint32          len = 0;
        uint32          lm_pw_len, nt_pw_len, hourslen;
        bool ret = True;

        if(sampass == NULL || buf == NULL) {
                DEBUG(0, ("init_samu_from_buffer_v1: NULL parameters found!\n"));
                return False;
        }

/* SAMU_BUFFER_FORMAT_V1       "dddddddBBBBBBBBBBBBddBBwdwdBwwd" */

        /* unpack the buffer into variables */
        len = tdb_unpack (buf, buflen, SAMU_BUFFER_FORMAT_V1,
                &logon_time,                                            /* d */
                &logoff_time,                                           /* d */
                &kickoff_time,                                          /* d */
                /* Change from V0 is addition of bad_password_time field. */
                &bad_password_time,                                     /* d */
                &pass_last_set_time,                                    /* d */
                &pass_can_change_time,                                  /* d */
                &pass_must_change_time,                                 /* d */
                &username_len, &username,                               /* B */
                &domain_len, &domain,                                   /* B */
                &nt_username_len, &nt_username,                         /* B */
                &fullname_len, &fullname,                               /* B */
                &homedir_len, &homedir,                                 /* B */
                &dir_drive_len, &dir_drive,                             /* B */
                &logon_script_len, &logon_script,                       /* B */
                &profile_path_len, &profile_path,                       /* B */
                &acct_desc_len, &acct_desc,                             /* B */
                &workstations_len, &workstations,                       /* B */
                &unknown_str_len, &unknown_str,                         /* B */
                &munged_dial_len, &munged_dial,                         /* B */
                &user_rid,                                              /* d */
                &group_rid,                                             /* d */
                &lm_pw_len, &lm_pw_ptr,                                 /* B */
                &nt_pw_len, &nt_pw_ptr,                                 /* B */
                &acct_ctrl,                                             /* w */
                &remove_me,                                             /* d */
                &logon_divs,                                            /* w */
                &hours_len,                                             /* d */
                &hourslen, &hours,                                      /* B */
                &bad_password_count,                                    /* w */
                &logon_count,                                           /* w */
                &unknown_6);                                            /* d */

        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);

        /* Change from V0 is addition of bad_password_time field. */
        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, username, domain,
                                         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, username, domain,
                                         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, username, domain,
                                         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, username, domain,
                                         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_pw_history(sampass, NULL, 0, PDB_SET);

        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(lm_pw_ptr);
        SAFE_FREE(nt_pw_ptr);
        SAFE_FREE(hours);

        return ret;
}

static bool init_samu_from_buffer_v2(struct samu *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 = NULL;
        char *domain = NULL;
        char *nt_username = NULL;
        char *dir_drive = NULL;
        char *unknown_str = NULL;
        char *munged_dial = NULL;
        char *fullname = NULL;
        char *homedir = NULL;
        char *logon_script = NULL;
        char *profile_path = NULL;
        char *acct_desc = NULL;
        char *workstations = NULL;
        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, hours_len, unknown_6;
        uint16  acct_ctrl, logon_divs;
        uint16  bad_password_count, logon_count;
        uint8   *hours = NULL;
        uint8   *lm_pw_ptr = NULL, *nt_pw_ptr = NULL, *nt_pw_hist_ptr = NULL;
        uint32          len = 0;
        uint32          lm_pw_len, nt_pw_len, nt_pw_hist_len, hourslen;
        uint32 pwHistLen = 0;
        bool ret = True;
        fstring tmp_string;
        bool expand_explicit = lp_passdb_expand_explicit();

        if(sampass == NULL || buf == NULL) {
                DEBUG(0, ("init_samu_from_buffer_v2: NULL parameters found!\n"));
                return False;
        }

/* SAMU_BUFFER_FORMAT_V2       "dddddddBBBBBBBBBBBBddBBBwwdBwwd" */

        /* unpack the buffer into variables */
        len = tdb_unpack (buf, buflen, SAMU_BUFFER_FORMAT_V2,
                &logon_time,                                            /* d */
                &logoff_time,                                           /* d */
                &kickoff_time,                                          /* d */
                &bad_password_time,                                     /* d */
                &pass_last_set_time,                                    /* d */
                &pass_can_change_time,                                  /* d */
                &pass_must_change_time,                                 /* d */
                &username_len, &username,                               /* B */
                &domain_len, &domain,                                   /* B */
                &nt_username_len, &nt_username,                         /* B */
                &fullname_len, &fullname,                               /* B */
                &homedir_len, &homedir,                                 /* B */
                &dir_drive_len, &dir_drive,                             /* B */
                &logon_script_len, &logon_script,                       /* B */
                &profile_path_len, &profile_path,                       /* B */
                &acct_desc_len, &acct_desc,                             /* B */
                &workstations_len, &workstations,                       /* B */
                &unknown_str_len, &unknown_str,                         /* B */
                &munged_dial_len, &munged_dial,                         /* B */
                &user_rid,                                              /* d */
                &group_rid,                                             /* d */
                &lm_pw_len, &lm_pw_ptr,                                 /* B */
                &nt_pw_len, &nt_pw_ptr,                                 /* B */
                /* Change from V1 is addition of password history field. */
                &nt_pw_hist_len, &nt_pw_hist_ptr,                       /* B */
                &acct_ctrl,                                             /* w */
                /* Also "remove_me" field was removed. */
                &logon_divs,                                            /* w */
                &hours_len,                                             /* d */
                &hourslen, &hours,                                      /* B */
                &bad_password_count,                                    /* w */
                &logon_count,                                           /* w */
                &unknown_6);                                            /* d */

        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) {
                fstrcpy( tmp_string, homedir );
                if (expand_explicit) {
                        standard_sub_basic( username, domain, tmp_string,
                                            sizeof(tmp_string) );
                }
                pdb_set_homedir(sampass, tmp_string, PDB_SET);
        }
        else {
                pdb_set_homedir(sampass, 
                        talloc_sub_basic(sampass, username, domain,
                                         lp_logon_home()),
                        PDB_DEFAULT);
        }

        if (dir_drive)  
                pdb_set_dir_drive(sampass, dir_drive, PDB_SET);
        else
                pdb_set_dir_drive(sampass, lp_logon_drive(), PDB_DEFAULT );

        if (logon_script) {
                fstrcpy( tmp_string, logon_script );
                if (expand_explicit) {
                        standard_sub_basic( username, domain, tmp_string,
                                            sizeof(tmp_string) );
                }
                pdb_set_logon_script(sampass, tmp_string, PDB_SET);
        }
        else {
                pdb_set_logon_script(sampass, 
                        talloc_sub_basic(sampass, username, domain,
                                         lp_logon_script()),
                        PDB_DEFAULT);
        }

        if (profile_path) {     
                fstrcpy( tmp_string, profile_path );
                if (expand_explicit) {
                        standard_sub_basic( username, domain, tmp_string,
                                            sizeof(tmp_string) );
                }
                pdb_set_profile_path(sampass, tmp_string, PDB_SET);
        } 
        else {
                pdb_set_profile_path(sampass, 
                        talloc_sub_basic(sampass, username, domain,
                                         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;
                }
        }

        /* Change from V1 is addition of password history field. */
        pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY, &pwHistLen);
        if (pwHistLen) {
                uint8 *pw_hist = SMB_MALLOC_ARRAY(uint8, pwHistLen * PW_HISTORY_ENTRY_LEN);
                if (!pw_hist) {
                        ret = False;
                        goto done;
                }
                memset(pw_hist, '\0', pwHistLen * PW_HISTORY_ENTRY_LEN);
                if (nt_pw_hist_ptr && nt_pw_hist_len) {
                        int i;
                        SMB_ASSERT((nt_pw_hist_len % PW_HISTORY_ENTRY_LEN) == 0);
                        nt_pw_hist_len /= PW_HISTORY_ENTRY_LEN;
                        for (i = 0; (i < pwHistLen) && (i < nt_pw_hist_len); i++) {
                                memcpy(&pw_hist[i*PW_HISTORY_ENTRY_LEN],
                                        &nt_pw_hist_ptr[i*PW_HISTORY_ENTRY_LEN],
                                        PW_HISTORY_ENTRY_LEN);
                        }
                }
                if (!pdb_set_pw_history(sampass, pw_hist, pwHistLen, PDB_SET)) {
                        SAFE_FREE(pw_hist);
                        ret = False;
                        goto done;
                }
                SAFE_FREE(pw_hist);
        } else {
                pdb_set_pw_history(sampass, NULL, 0, PDB_SET);
        }

        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(lm_pw_ptr);
        SAFE_FREE(nt_pw_ptr);
        SAFE_FREE(nt_pw_hist_ptr);
        SAFE_FREE(hours);

        return ret;
}

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

static bool init_samu_from_buffer_v3(struct samu *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 = NULL;
        char *domain = NULL;
        char *nt_username = NULL;
        char *dir_drive = NULL;
        char *comment = NULL;
        char *munged_dial = NULL;
        char *fullname = NULL;
        char *homedir = NULL;
        char *logon_script = NULL;
        char *profile_path = NULL;
        char *acct_desc = NULL;
        char *workstations = NULL;
        uint32  username_len, domain_len, nt_username_len,
                dir_drive_len, comment_len, munged_dial_len,
                fullname_len, homedir_len, logon_script_len,
                profile_path_len, acct_desc_len, workstations_len;

        uint32  user_rid, group_rid, hours_len, unknown_6, acct_ctrl;
        uint16  logon_divs;
        uint16  bad_password_count, logon_count;
        uint8   *hours = NULL;
        uint8   *lm_pw_ptr = NULL, *nt_pw_ptr = NULL, *nt_pw_hist_ptr = NULL;
        uint32          len = 0;
        uint32          lm_pw_len, nt_pw_len, nt_pw_hist_len, hourslen;
        uint32 pwHistLen = 0;
        bool ret = True;
        fstring tmp_string;
        bool expand_explicit = lp_passdb_expand_explicit();

        if(sampass == NULL || buf == NULL) {
                DEBUG(0, ("init_samu_from_buffer_v3: NULL parameters found!\n"));
                return False;
        }

/* SAMU_BUFFER_FORMAT_V3       "dddddddBBBBBBBBBBBBddBBBdwdBwwd" */

        /* unpack the buffer into variables */
        len = tdb_unpack (buf, buflen, SAMU_BUFFER_FORMAT_V3,
                &logon_time,                                            /* d */
                &logoff_time,                                           /* d */
                &kickoff_time,                                          /* d */
                &bad_password_time,                                     /* d */
                &pass_last_set_time,                                    /* d */
                &pass_can_change_time,                                  /* d */
                &pass_must_change_time,                                 /* d */
                &username_len, &username,                               /* B */
                &domain_len, &domain,                                   /* B */
                &nt_username_len, &nt_username,                         /* B */
                &fullname_len, &fullname,                               /* B */
                &homedir_len, &homedir,                                 /* B */
                &dir_drive_len, &dir_drive,                             /* B */
                &logon_script_len, &logon_script,                       /* B */
                &profile_path_len, &profile_path,                       /* B */
                &acct_desc_len, &acct_desc,                             /* B */
                &workstations_len, &workstations,                       /* B */
                &comment_len, &comment,                                 /* B */
                &munged_dial_len, &munged_dial,                         /* B */
                &user_rid,                                              /* d */
                &group_rid,                                             /* d */
                &lm_pw_len, &lm_pw_ptr,                                 /* B */
                &nt_pw_len, &nt_pw_ptr,                                 /* B */
                /* Change from V1 is addition of password history field. */
                &nt_pw_hist_len, &nt_pw_hist_ptr,                       /* B */
                /* Change from V2 is the uint32 acb_mask */
                &acct_ctrl,                                             /* d */
                /* Also "remove_me" field was removed. */
                &logon_divs,                                            /* w */
                &hours_len,                                             /* d */
                &hourslen, &hours,                                      /* B */
                &bad_password_count,                                    /* w */
                &logon_count,                                           /* w */
                &unknown_6);                                            /* d */

        if (len == (uint32) -1)  {
                ret = False;
                goto done;
        }

        pdb_set_logon_time(sampass, convert_uint32_to_time_t(logon_time), PDB_SET);
        pdb_set_logoff_time(sampass, convert_uint32_to_time_t(logoff_time), PDB_SET);
        pdb_set_kickoff_time(sampass, convert_uint32_to_time_t(kickoff_time), PDB_SET);
        pdb_set_bad_password_time(sampass, convert_uint32_to_time_t(bad_password_time), PDB_SET);
        pdb_set_pass_can_change_time(sampass, convert_uint32_to_time_t(pass_can_change_time), PDB_SET);
        pdb_set_pass_must_change_time(sampass, convert_uint32_to_time_t(pass_must_change_time), PDB_SET);
        pdb_set_pass_last_set_time(sampass, convert_uint32_to_time_t(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) {
                fstrcpy( tmp_string, homedir );
                if (expand_explicit) {
                        standard_sub_basic( username, domain, tmp_string,
                                            sizeof(tmp_string) );
                }
                pdb_set_homedir(sampass, tmp_string, PDB_SET);
        }
        else {
                pdb_set_homedir(sampass, 
                        talloc_sub_basic(sampass, username, domain,
                                         lp_logon_home()),
                        PDB_DEFAULT);
        }

        if (dir_drive)  
                pdb_set_dir_drive(sampass, dir_drive, PDB_SET);
        else
                pdb_set_dir_drive(sampass, lp_logon_drive(), PDB_DEFAULT );

        if (logon_script) {
                fstrcpy( tmp_string, logon_script );
                if (expand_explicit) {
                        standard_sub_basic( username, domain, tmp_string,
                                            sizeof(tmp_string) );
                }
                pdb_set_logon_script(sampass, tmp_string, PDB_SET);
        }
        else {
                pdb_set_logon_script(sampass, 
                        talloc_sub_basic(sampass, username, domain,
                                         lp_logon_script()),
                        PDB_DEFAULT);
        }

        if (profile_path) {     
                fstrcpy( tmp_string, profile_path );
                if (expand_explicit) {
                        standard_sub_basic( username, domain, tmp_string,
                                            sizeof(tmp_string) );
                }
                pdb_set_profile_path(sampass, tmp_string, PDB_SET);
        } 
        else {
                pdb_set_profile_path(sampass, 
                        talloc_sub_basic(sampass, username, domain, lp_logon_path()),
                        PDB_DEFAULT);
        }

        pdb_set_acct_desc(sampass, acct_desc, PDB_SET);
        pdb_set_comment(sampass, comment, 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_get_account_policy(PDB_POLICY_PASSWORD_HISTORY, &pwHistLen);
        if (pwHistLen) {
                uint8 *pw_hist = (uint8 *)SMB_MALLOC(pwHistLen * PW_HISTORY_ENTRY_LEN);
                if (!pw_hist) {
                        ret = False;
                        goto done;
                }
                memset(pw_hist, '\0', pwHistLen * PW_HISTORY_ENTRY_LEN);
                if (nt_pw_hist_ptr && nt_pw_hist_len) {
                        int i;
                        SMB_ASSERT((nt_pw_hist_len % PW_HISTORY_ENTRY_LEN) == 0);
                        nt_pw_hist_len /= PW_HISTORY_ENTRY_LEN;
                        for (i = 0; (i < pwHistLen) && (i < nt_pw_hist_len); i++) {
                                memcpy(&pw_hist[i*PW_HISTORY_ENTRY_LEN],
                                        &nt_pw_hist_ptr[i*PW_HISTORY_ENTRY_LEN],
                                        PW_HISTORY_ENTRY_LEN);
                        }
                }
                if (!pdb_set_pw_history(sampass, pw_hist, pwHistLen, PDB_SET)) {
                        SAFE_FREE(pw_hist);
                        ret = False;
                        goto done;
                }
                SAFE_FREE(pw_hist);
        } else {
                pdb_set_pw_history(sampass, NULL, 0, PDB_SET);
        }

        pdb_set_user_sid_from_rid(sampass, user_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);
        /* Change from V2 is the uint32 acct_ctrl */
        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(comment);
        SAFE_FREE(lm_pw_ptr);
        SAFE_FREE(nt_pw_ptr);
        SAFE_FREE(nt_pw_hist_ptr);
        SAFE_FREE(hours);

        return ret;
}

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

static uint32 init_buffer_from_samu_v3 (uint8 **buf, struct samu *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 *comment;
        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, comment_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;
        const uint8 *nt_pw_hist;
        uint32  lm_pw_len = 16;
        uint32  nt_pw_len = 16;
        uint32  nt_pw_hist_len;
        uint32 pwHistLen = 0;

        *buf = NULL;
        buflen = 0;

        logon_time = convert_time_t_to_uint32(pdb_get_logon_time(sampass));
        logoff_time = convert_time_t_to_uint32(pdb_get_logoff_time(sampass));
        kickoff_time = convert_time_t_to_uint32(pdb_get_kickoff_time(sampass));
        bad_password_time = convert_time_t_to_uint32(pdb_get_bad_password_time(sampass));
        pass_can_change_time = convert_time_t_to_uint32(pdb_get_pass_can_change_time_noncalc(sampass));
        pass_must_change_time = convert_time_t_to_uint32(pdb_get_pass_must_change_time(sampass));
        pass_last_set_time = convert_time_t_to_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;
        }

        pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY, &pwHistLen);
        nt_pw_hist =  pdb_get_pw_history(sampass, &nt_pw_hist_len);
        if (pwHistLen && nt_pw_hist && nt_pw_hist_len) {
                nt_pw_hist_len *= PW_HISTORY_ENTRY_LEN;
        } else {
                nt_pw_hist_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;
        }

        comment = pdb_get_comment(sampass);
        if (comment) {
                comment_len = strlen(comment) +1;
        } else {
                comment_len = 0;
        }

        munged_dial = pdb_get_munged_dial(sampass);
        if (munged_dial) {
                munged_dial_len = strlen(munged_dial) +1;
        } else {
                munged_dial_len = 0;    
        }

/* SAMU_BUFFER_FORMAT_V3       "dddddddBBBBBBBBBBBBddBBBdwdBwwd" */

        /* one time to get the size needed */
        len = tdb_pack(NULL, 0,  SAMU_BUFFER_FORMAT_V3,
                logon_time,                             /* d */
                logoff_time,                            /* d */
                kickoff_time,                           /* d */
                bad_password_time,                      /* d */
                pass_last_set_time,                     /* d */
                pass_can_change_time,                   /* d */
                pass_must_change_time,                  /* d */
                username_len, username,                 /* B */
                domain_len, domain,                     /* B */
                nt_username_len, nt_username,           /* B */
                fullname_len, fullname,                 /* B */
                homedir_len, homedir,                   /* B */
                dir_drive_len, dir_drive,               /* B */
                logon_script_len, logon_script,         /* B */
                profile_path_len, profile_path,         /* B */
                acct_desc_len, acct_desc,               /* B */
                workstations_len, workstations,         /* B */
                comment_len, comment,                   /* B */
                munged_dial_len, munged_dial,           /* B */
                user_rid,                               /* d */
                group_rid,                              /* d */
                lm_pw_len, lm_pw,                       /* B */
                nt_pw_len, nt_pw,                       /* B */
                nt_pw_hist_len, nt_pw_hist,             /* B */
                pdb_get_acct_ctrl(sampass),             /* d */
                pdb_get_logon_divs(sampass),            /* w */
                pdb_get_hours_len(sampass),             /* d */
                MAX_HOURS_LEN, pdb_get_hours(sampass),  /* B */
                pdb_get_bad_password_count(sampass),    /* w */
                pdb_get_logon_count(sampass),           /* w */
                pdb_get_unknown_6(sampass));            /* d */

        if (size_only) {
                return buflen;
        }

        /* malloc the space needed */
        if ( (*buf=(uint8*)SMB_MALLOC(len)) == NULL) {
                DEBUG(0,("init_buffer_from_samu_v3: Unable to malloc() memory for buffer!\n"));
                return (-1);
        }

        /* now for the real call to tdb_pack() */
        buflen = tdb_pack(*buf, len,  SAMU_BUFFER_FORMAT_V3,
                logon_time,                             /* d */
                logoff_time,                            /* d */
                kickoff_time,                           /* d */
                bad_password_time,                      /* d */
                pass_last_set_time,                     /* d */
                pass_can_change_time,                   /* d */
                pass_must_change_time,                  /* d */
                username_len, username,                 /* B */
                domain_len, domain,                     /* B */
                nt_username_len, nt_username,           /* B */
                fullname_len, fullname,                 /* B */
                homedir_len, homedir,                   /* B */
                dir_drive_len, dir_drive,               /* B */
                logon_script_len, logon_script,         /* B */
                profile_path_len, profile_path,         /* B */
                acct_desc_len, acct_desc,               /* B */
                workstations_len, workstations,         /* B */
                comment_len, comment,                   /* B */
                munged_dial_len, munged_dial,           /* B */
                user_rid,                               /* d */
                group_rid,                              /* d */
                lm_pw_len, lm_pw,                       /* B */
                nt_pw_len, nt_pw,                       /* B */
                nt_pw_hist_len, nt_pw_hist,             /* B */
                pdb_get_acct_ctrl(sampass),             /* d */
                pdb_get_logon_divs(sampass),            /* w */
                pdb_get_hours_len(sampass),             /* d */
                MAX_HOURS_LEN, pdb_get_hours(sampass),  /* B */
                pdb_get_bad_password_count(sampass),    /* w */
                pdb_get_logon_count(sampass),           /* w */
                pdb_get_unknown_6(sampass));            /* d */

        /* check to make sure we got it correct */
        if (buflen != len) {
                DEBUG(0, ("init_buffer_from_samu_v3: 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 init_samu_from_buffer_v4(struct samu *sampass, uint8 *buf, uint32 buflen)
{
        /* nothing changed between V3 and V4 */
        return init_samu_from_buffer_v3(sampass, buf, buflen);
}

static uint32 init_buffer_from_samu_v4(uint8 **buf, struct samu *sampass, bool size_only)
{
        /* nothing changed between V3 and V4 */
        return init_buffer_from_samu_v3(buf, sampass, size_only);
}

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

bool init_samu_from_buffer(struct samu *sampass, uint32_t level,
                           uint8 *buf, uint32 buflen)
{
        switch (level) {
        case SAMU_BUFFER_V0:
                return init_samu_from_buffer_v0(sampass, buf, buflen);
        case SAMU_BUFFER_V1:
                return init_samu_from_buffer_v1(sampass, buf, buflen);
        case SAMU_BUFFER_V2:
                return init_samu_from_buffer_v2(sampass, buf, buflen);
        case SAMU_BUFFER_V3:
                return init_samu_from_buffer_v3(sampass, buf, buflen);
        case SAMU_BUFFER_V4:
                return init_samu_from_buffer_v4(sampass, buf, buflen);
        }

        return false;
}

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

uint32 init_buffer_from_samu (uint8 **buf, struct samu *sampass, bool size_only)
{
        return init_buffer_from_samu_v4(buf, sampass, size_only);
}

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

bool pdb_copy_sam_account(struct samu *dst, struct samu *src )
{
        uint8 *buf = NULL;
        int len;

        len = init_buffer_from_samu(&buf, src, False);
        if (len == -1 || !buf) {
                SAFE_FREE(buf);
                return False;
        }

        if (!init_samu_from_buffer( dst, SAMU_BUFFER_LATEST, buf, len )) {
                free(buf);
                return False;
        }

        dst->methods = src->methods;

        if ( src->unix_pw ) {
                dst->unix_pw = tcopy_passwd( dst, src->unix_pw );
                if (!dst->unix_pw) {
                        free(buf);
                        return False;
                }
        }

        if (src->group_sid) {
                pdb_set_group_sid(dst, src->group_sid, PDB_SET);
        }

        free(buf);
        return True;
}

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

bool pdb_update_bad_password_count(struct samu *sampass, bool *updated)
{
        time_t LastBadPassword;
        uint16 BadPasswordCount;
        uint32 resettime; 
        bool res;

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

        become_root();
        res = pdb_get_account_policy(PDB_POLICY_RESET_COUNT_TIME, &resettime);
        unbecome_root();

        if (!res) {
                DEBUG(0, ("pdb_update_bad_password_count: pdb_get_account_policy 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 + convert_uint32_to_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 PDB_POLICY_LOCK_ACCOUNT_DURATION
*********************************************************************/

bool pdb_update_autolock_flag(struct samu *sampass, bool *updated)
{
        uint32 duration;
        time_t LastBadPassword;
        bool res;

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

        become_root();
        res = pdb_get_account_policy(PDB_POLICY_LOCK_ACCOUNT_DURATION, &duration);
        unbecome_root();

        if (!res) {
                DEBUG(0, ("pdb_update_autolock_flag: pdb_get_account_policy failed.\n"));
                return False;
        }

        /* First, check if there is a duration to compare */
        if ((duration == (uint32) -1)  || (duration == 0)) {
                DEBUG(9, ("pdb_update_autolock_flag: No reset duration, can't reset autolock\n"));
                return True;
        }

        LastBadPassword = pdb_get_bad_password_time(sampass);
        DEBUG(7, ("pdb_update_autolock_flag: Account %s, LastBadPassword=%d, duration=%d, current time =%d.\n",
                  pdb_get_username(sampass), (uint32)LastBadPassword, duration*60, (uint32)time(NULL)));

        if (LastBadPassword == (time_t)0) {
                DEBUG(1,("pdb_update_autolock_flag: Account %s "
                         "administratively locked out with no bad password "
                         "time. Leaving locked out.\n",
                         pdb_get_username(sampass) ));
                return True;
        }

        if ((time(NULL) > (LastBadPassword + convert_uint32_to_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(struct samu *sampass)
{
        uint32 account_policy_lockout;
        bool autolock_updated = False, badpw_updated = False;
        bool ret;

        /* Retrieve the account lockout policy */
        become_root();
        ret = pdb_get_account_policy(PDB_POLICY_BAD_ATTEMPT_LOCKOUT, &account_policy_lockout);
        unbecome_root();
        if ( !ret ) {
                DEBUG(0, ("pdb_increment_bad_password_count: pdb_get_account_policy 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;
}

bool is_dc_trusted_domain_situation(const char *domain_name)
{
        return IS_DC && !strequal(domain_name, lp_workgroup());
}

/*******************************************************************
 Wrapper around retrieving the clear text trust account password.
 appropriate account name is stored in account_name.
 Caller must free password, but not account_name.
*******************************************************************/

bool get_trust_pw_clear(const char *domain, char **ret_pwd,
                        const char **account_name,
                        enum netr_SchannelType *channel)
{
        char *pwd;
        time_t last_set_time;

        /* if we are a DC and this is not our domain, then lookup an account
         * for the domain trust */

        if (is_dc_trusted_domain_situation(domain)) {
                if (!lp_allow_trusted_domains()) {
                        return false;
                }

                if (!pdb_get_trusteddom_pw(domain, ret_pwd, NULL,
                                           &last_set_time))
                {
                        DEBUG(0, ("get_trust_pw: could not fetch trust "
                                "account password for trusted domain %s\n",
                                domain));
                        return false;
                }

                if (channel != NULL) {
                        *channel = SEC_CHAN_DOMAIN;
                }

                if (account_name != NULL) {
                        *account_name = lp_workgroup();
                }

                return true;
        }

        /*
         * Since we can only be member of one single domain, we are now
         * in a member situation:
         *
         *  -  Either we are a DC (selfjoined) and the domain is our
         *     own domain.
         *  -  Or we are on a member and the domain is our own or some
         *     other (potentially trusted) domain.
         *
         * In both cases, we can only get the machine account password
         * for our own domain to connect to our own dc. (For a member,
         * request to trusted domains are performed through our dc.)
         *
         * So we simply use our own domain name to retrieve the
         * machine account passowrd and ignore the request domain here.
         */

        pwd = secrets_fetch_machine_password(lp_workgroup(), &last_set_time, channel);

        if (pwd != NULL) {
                *ret_pwd = pwd;
                if (account_name != NULL) {
                        *account_name = global_myname();
                }

                return true;
        }

        DEBUG(5, ("get_trust_pw_clear: could not fetch clear text trust "
                  "account password for domain %s\n", domain));
        return false;
}

/*******************************************************************
 Wrapper around retrieving the trust account password.
 appropriate account name is stored in account_name.
*******************************************************************/

bool get_trust_pw_hash(const char *domain, uint8 ret_pwd[16],
                       const char **account_name,
                       enum netr_SchannelType *channel)
{
        char *pwd = NULL;
        time_t last_set_time;

        if (get_trust_pw_clear(domain, &pwd, account_name, channel)) {
                E_md4hash(pwd, ret_pwd);
                SAFE_FREE(pwd);
                return true;
        } else if (is_dc_trusted_domain_situation(domain)) {
                return false;
        }

        /* as a fallback, try to get the hashed pwd directly from the tdb... */

        if (secrets_fetch_trust_account_password_legacy(domain, ret_pwd,
                                                        &last_set_time,
                                                        channel))
        {
                if (account_name != NULL) {
                        *account_name = global_myname();
                }

                return true;
        }

        DEBUG(5, ("get_trust_pw_hash: could not fetch trust account "
                "password for domain %s\n", domain));
        return False;
}

struct samr_LogonHours get_logon_hours_from_pdb(TALLOC_CTX *mem_ctx,
                                                struct samu *pw)
{
        struct samr_LogonHours hours;
        const int units_per_week = 168;

        ZERO_STRUCT(hours);
        hours.bits = talloc_array(mem_ctx, uint8_t, units_per_week);
        if (!hours.bits) {
                return hours;
        }

        hours.units_per_week = units_per_week;
        memset(hours.bits, 0xFF, units_per_week);

        if (pdb_get_hours(pw)) {
                memcpy(hours.bits, pdb_get_hours(pw),
                       MIN(pdb_get_hours_len(pw), units_per_week));
        }

        return hours;
}