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

/* 
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Jeremy Allison                 1996-2001
   Copyright (C) Luke Kenneth Casson Leighton   1996-1998
   Copyright (C) Gerald (Jerry) Carter          2000-2001
   Copyright (C) Andrew Bartlett                2001-2002
      
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB

/*
 * This is set on startup - it defines the SID for this
 * machine, and therefore the SAM database for which it is
 * responsible.
 */

extern pstring global_myname;

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

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

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

        user->private.init_flag             = FLAG_SAM_UNINIT;
        user->private.uid = user->private.gid       = -1;

        user->private.logon_time            = (time_t)0;
        user->private.pass_last_set_time    = (time_t)0;
        user->private.pass_can_change_time  = (time_t)0;
        user->private.logoff_time           = 
        user->private.kickoff_time          = 
        user->private.pass_must_change_time = get_time_t_max();
        user->private.unknown_3 = 0x00ffffff;   /* don't know */
        user->private.logon_divs = 168;         /* hours per week */
        user->private.hours_len = 21;           /* 21 times 8 bits = 168 */
        memset(user->private.hours, 0xff, user->private.hours_len); /* available at all hours */
        user->private.unknown_5 = 0x00000000; /* don't know */
        user->private.unknown_6 = 0x000004ec; /* don't know */

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

        user->private.plaintext_pw = NULL;

}       

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

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


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

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

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

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

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

        (*user)->mem_ctx = mem_ctx;

        (*user)->free_fn = NULL;

        pdb_fill_default_sam(*user);
        
        return NT_STATUS_OK;
}


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

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

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

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

        return NT_STATUS_OK;
}


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

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

        const char *guest_account = lp_guestaccount();
        if (!(guest_account && *guest_account)) {
                DEBUG(1, ("NULL guest account!?!?\n"));
                return NT_STATUS_UNSUCCESSFUL;
        }

        if (!pwd) {
                return NT_STATUS_UNSUCCESSFUL;
        }

        pdb_fill_default_sam(sam_account);

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

        pdb_set_unix_homedir(sam_account, pwd->pw_dir);

        pdb_set_domain (sam_account, lp_workgroup());

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


        /* Ensure this *must* be set right */
        if (strcmp(pwd->pw_name, guest_account) == 0) {
                if (!pdb_set_user_sid_from_rid(sam_account, DOMAIN_USER_RID_GUEST)) {
                        return NT_STATUS_UNSUCCESSFUL;
                }
                if (!pdb_set_group_sid_from_rid(sam_account, DOMAIN_GROUP_RID_GUESTS)) {
                        return NT_STATUS_UNSUCCESSFUL;
                }
        } else {

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

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


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

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

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

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

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

        return NT_STATUS_OK;
}


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

static void pdb_free_sam_contents(SAM_ACCOUNT *user)
{

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

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


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

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

        pdb_fill_default_sam(user);

        return NT_STATUS_OK;
}


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

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

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

        return NT_STATUS_OK;    
}


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

char *pdb_encode_acct_ctrl(uint16 acct_ctrl, size_t length)
{
        static fstring acct_str;
        size_t i = 0;

        acct_str[i++] = '[';

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

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

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

        return acct_str;
}     

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

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

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

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

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

        return acct_ctrl;
}

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

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

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

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

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

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

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

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

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

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


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

uint32 fallback_pdb_uid_to_user_rid(uid_t uid)
{
        int rid_offset = lp_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 = lp_algorithmic_rid_base();
        return (gid_t)(((group_rid & (~GROUP_RID_TYPE))- rid_offset)/RID_MULTIPLIER);
}

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

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

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

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

        return (rid < BASE_RID);
}

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

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

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

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

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

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

        /*
         * Don't try to convert the rid to a name if 
         * running in appliance mode
         */

        if (lp_hide_local_users())
                return False;
                
        if (!NT_STATUS_IS_OK(pdb_init_sam(&sam_account))) {
                return False;
        }
                
        /* This now does the 'generic' mapping in pdb_unix */
        /* 'guest' is also handled there */
        if (pdb_getsampwsid(sam_account, sid)) {
                fstrcpy(name, pdb_get_username(sam_account));
                *psid_name_use = SID_NAME_USER;

                pdb_free_sam(&sam_account);
                        
                return True;
        }

        pdb_free_sam(&sam_account);
                
        if (get_group_map_from_sid(*sid, &map, MAPPING_WITHOUT_PRIV)) {
                if (map.gid!=-1) {
                        DEBUG(5,("local_lookup_sid: mapped group %s to gid %u\n", map.nt_name, (unsigned int)map.gid));
                } else {
                        DEBUG(5,("local_lookup_sid: mapped group %s to no unix gid.  Returning name.\n", map.nt_name));
                }

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

        if (pdb_rid_is_user(rid)) {
                uid_t uid;

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

                uid = fallback_pdb_user_rid_to_uid(rid);
                slprintf(name, sizeof(fstring)-1, "unix_user.%u", (unsigned int)uid);   

                return False;  /* Indicates that this user was 'not mapped' */
        } else {
                gid_t gid;
                struct group *gr; 
                        
                DEBUG(5, ("assuming RID %u is a group\n", (unsigned)rid));

                gid = pdb_group_rid_to_gid(rid);
                gr = getgrgid(gid);
                        
                *psid_name_use = SID_NAME_ALIAS;
                        
                DEBUG(5,("local_lookup_sid: looking up gid %u %s\n", (unsigned int)gid,
                         gr ? "succeeded" : "failed" ));
                        
                if(!gr) {
                        slprintf(name, sizeof(fstring)-1, "unix_group.%u", (unsigned int)gid);
                        return False; /* Indicates that this group was 'not mapped' */
                }
                        
                fstrcpy( name, gr->gr_name);
                        
                DEBUG(5,("local_lookup_sid: found group %s for rid %u\n", name,
                         (unsigned int)rid ));
                return True;   
        }
}

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

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

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

        fstrcpy(user, c_user);

        sid_copy(&local_sid, get_global_sam_sid());

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

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

        /* 
         * Don't lookup local unix users if running in appliance mode
         */
        if (lp_hide_local_users()) 
                return False;

        (void)map_username(user);

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

        pdb_free_sam(&sam_account);

        /*
         * Maybe it was a group ?
         */

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

        sid_copy( psid, &local_sid);

        return True;
}

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

DOM_SID *local_uid_to_sid(DOM_SID *psid, uid_t uid)
{
        struct passwd *pass;
        SAM_ACCOUNT *sam_user = NULL;
        fstring str; /* sid string buffer */

        sid_copy(psid, get_global_sam_sid());

        if((pass = getpwuid_alloc(uid))) {

                if (NT_STATUS_IS_ERR(pdb_init_sam(&sam_user))) {
                        passwd_free(&pass);
                        return NULL;
                }
                
                if (pdb_getsampwnam(sam_user, pass->pw_name)) {
                        sid_copy(psid, pdb_get_user_sid(sam_user));
                } else if (strcmp(pass->pw_name, lp_guestaccount()) == 0) {
                        sid_append_rid(psid, DOMAIN_USER_RID_GUEST);
                } else {
                        sid_append_rid(psid, fallback_pdb_uid_to_user_rid(uid));
                }

                DEBUG(10,("local_uid_to_sid: uid %u -> SID (%s) (%s).\n", 
                          (unsigned)uid, sid_to_string( str, psid),
                          pass->pw_name ));

                passwd_free(&pass);
                pdb_free_sam(&sam_user);
        
        } else {
                sid_append_rid(psid, fallback_pdb_uid_to_user_rid(uid));

                DEBUG(10,("local_uid_to_sid: uid %u -> SID (%s) (unknown user).\n", 
                          (unsigned)uid, sid_to_string( str, psid)));
        }

        return psid;
}

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

BOOL local_sid_to_uid(uid_t *puid, const DOM_SID *psid, enum SID_NAME_USE *name_type)
{
        fstring str;
        SAM_ACCOUNT *sam_user = NULL;

        *name_type = SID_NAME_UNKNOWN;

        if (NT_STATUS_IS_ERR(pdb_init_sam(&sam_user)))
                return False;
        
        if (pdb_getsampwsid(sam_user, psid)) {
                
                if (!(pdb_get_init_flag(sam_user) & FLAG_SAM_UID)) { 
                        pdb_free_sam(&sam_user);
                        return False;
                }

                *puid = pdb_get_uid(sam_user);
                        
                DEBUG(10,("local_sid_to_uid: SID %s -> uid (%u) (%s).\n", sid_to_string( str, psid),
                          (unsigned int)*puid, pdb_get_username(sam_user)));
                pdb_free_sam(&sam_user);
        } else {

                DOM_SID dom_sid;
                uint32 rid;
                GROUP_MAP map;

                pdb_free_sam(&sam_user);  

                if (get_group_map_from_sid(*psid, &map, MAPPING_WITHOUT_PRIV)) {
                        DEBUG(3, ("local_sid_to_uid: SID '%s' is a group, not a user... \n", sid_to_string(str, psid)));
                        /* It's a group, not a user... */
                        return False;
                }

                sid_copy(&dom_sid, psid);
                if (!sid_peek_check_rid(get_global_sam_sid(), psid, &rid)) {
                        DEBUG(3, ("sid_peek_rid failed - sid '%s' is not in our domain\n", sid_to_string(str, psid)));
                        return False;
                }

                if (!pdb_rid_is_user(rid)) {
                        DEBUG(3, ("local_sid_to_uid: sid '%s' cannot be mapped to a uid algorithmicly becouse it is a group\n", sid_to_string(str, psid)));
                        return False;
                }
                
                *puid = fallback_pdb_user_rid_to_uid(rid);
                
                DEBUG(5,("local_sid_to_uid: SID %s algorithmicly mapped to %ld mapped becouse SID was not found in passdb.\n", 
                         sid_to_string(str, psid), (signed long int)(*puid)));
        }

        *name_type = SID_NAME_USER;

        return True;
}

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

DOM_SID *local_gid_to_sid(DOM_SID *psid, gid_t gid)
{
        GROUP_MAP map;

        sid_copy(psid, get_global_sam_sid());
        
        if (get_group_map_from_gid(gid, &map, MAPPING_WITHOUT_PRIV)) {
                sid_copy(psid, &map.sid);
        } 
        else {
                sid_append_rid(psid, pdb_gid_to_group_rid(gid));
        }

        return psid;
}

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

BOOL local_sid_to_gid(gid_t *pgid, const DOM_SID *psid, enum SID_NAME_USE *name_type)
{
        fstring str;
        GROUP_MAP map;

        *name_type = SID_NAME_UNKNOWN;

        /*
         * We can only convert to a gid if this is our local
         * Domain SID (ie. we are the controling authority).
         *
         * Or in the Builtin SID too. JFM, 11/30/2001
         */

        if (get_group_map_from_sid(*psid, &map, MAPPING_WITHOUT_PRIV)) {
                
                /* the SID is in the mapping table but not mapped */
                if (map.gid==-1)
                        return False;

                *pgid = map.gid;
                *name_type = map.sid_name_use;
                DEBUG(10,("local_sid_to_gid: mapped SID %s (%s) -> gid (%u).\n", 
                          sid_to_string( str, psid),
                          map.nt_name, (unsigned int)*pgid));

        } else {
                uint32 rid;
                SAM_ACCOUNT *sam_user = NULL;
                if (NT_STATUS_IS_ERR(pdb_init_sam(&sam_user)))
                        return False;
                
                if (pdb_getsampwsid(sam_user, psid)) {
                        return False;
                        pdb_free_sam(&sam_user);
                }

                pdb_free_sam(&sam_user);

                if (!sid_peek_check_rid(get_global_sam_sid(), psid, &rid)) {
                        DEBUG(3, ("sid_peek_rid failed - sid '%s' is not in our domain\n", sid_to_string(str, psid)));
                        return False;
                }

                if (pdb_rid_is_user(rid))
                        return False;
                
                *pgid = pdb_group_rid_to_gid(rid);
                *name_type = SID_NAME_ALIAS;
                DEBUG(10,("local_sid_to_gid: SID %s -> gid (%u).\n", sid_to_string( str, psid),
                          (unsigned int)*pgid));
        }
        
        return True;
}

/** 
 * Quick hack to do an easy ucs2 -> mulitbyte conversion 
 * @return static buffer containing the converted string
 **/

const char *pdb_unistr2_convert(const UNISTR2 *from)
{
        static pstring convert_buffer;
        *convert_buffer = 0;
        if (!from) {
                return NULL;
        }

        unistr2_to_ascii(convert_buffer, from, sizeof(pstring));
        return convert_buffer;
}

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

 FIXME!!  The function needs to be abstracted into the
 passdb interface or something.  It is currently being called
 by _api_samr_create_user() in rpc_server/srv_samr.c,
 in SWAT and by smbpasswd/pdbedit.
 
 --jerry
 *************************************************************/

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

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

        /* Get the smb passwd entry for this user */
        pdb_init_sam(&sam_pass);
        if(!pdb_getsampwnam(sam_pass, user_name)) {
                pdb_free_sam(&sam_pass);
                
                if (local_flags & LOCAL_ADD_USER) {
                        pwd = getpwnam_alloc(user_name);
                } else if (local_flags & LOCAL_DELETE_USER) {
                        /* Might not exist in /etc/passwd */
                } else {
                        slprintf(err_str, err_str_len-1,"Failed to find entry for user %s.\n", user_name);
                        return False;
                }
                
                if (pwd) {
                        /* Local user found, so init from this */
                        if (!NT_STATUS_IS_OK(pdb_init_sam_pw(&sam_pass, pwd))){
                                slprintf(err_str, err_str_len-1, "Failed initialise SAM_ACCOUNT for user %s.\n", user_name);
                                passwd_free(&pwd);
                                return False;
                        }
                
                        passwd_free(&pwd);
                } else {
                        if (!NT_STATUS_IS_OK(pdb_init_sam(&sam_pass))){
                                slprintf(err_str, err_str_len-1, "Failed initialise SAM_ACCOUNT for user %s.\n", user_name);
                                return False;
                        }

                        if (!pdb_set_username(sam_pass, user_name)) {
                                slprintf(err_str, err_str_len - 1, "Failed to set username for user %s.\n", user_name);
                                pdb_free_sam(&sam_pass);
                                return False;
                        }
                }
        } else {
                /* the entry already existed */
                local_flags &= ~LOCAL_ADD_USER;
        }

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

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

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

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

        pdb_free_sam(&sam_pass);
        return True;
}