s4-repl: fixed a memory error handling linked attributes

[Samba/aatanasov.git] / source3 / auth / auth_util.c

/*
   Unix SMB/CIFS implementation.
   Authentication utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Andrew Bartlett 2001
   Copyright (C) Jeremy Allison 2000-2001
   Copyright (C) Rafal Szczesniak 2002
   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 "smbd/globals.h"
#include "../libcli/auth/libcli_auth.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH

/****************************************************************************
 Ensure primary group SID is always at position 0 in a 
 auth_serversupplied_info struct.
****************************************************************************/

static void sort_sid_array_for_smbd(auth_serversupplied_info *result,
                                const DOM_SID *pgroup_sid)
{
        unsigned int i;

        if (!result->sids) {
                return;
        }

        if (sid_compare(&result->sids[0], pgroup_sid)==0) {
                return;
        }

        for (i = 1; i < result->num_sids; i++) {
                if (sid_compare(pgroup_sid,
                                &result->sids[i]) == 0) {
                        sid_copy(&result->sids[i], &result->sids[0]);
                        sid_copy(&result->sids[0], pgroup_sid);
                        return;
                }
        }
}

/****************************************************************************
 Create a UNIX user on demand.
****************************************************************************/

static int _smb_create_user(const char *domain, const char *unix_username, const char *homedir)
{
        TALLOC_CTX *ctx = talloc_tos();
        char *add_script;
        int ret;

        add_script = talloc_strdup(ctx, lp_adduser_script());
        if (!add_script || !*add_script) {
                return -1;
        }
        add_script = talloc_all_string_sub(ctx,
                                add_script,
                                "%u",
                                unix_username);
        if (!add_script) {
                return -1;
        }
        if (domain) {
                add_script = talloc_all_string_sub(ctx,
                                        add_script,
                                        "%D",
                                        domain);
                if (!add_script) {
                        return -1;
                }
        }
        if (homedir) {
                add_script = talloc_all_string_sub(ctx,
                                add_script,
                                "%H",
                                homedir);
                if (!add_script) {
                        return -1;
                }
        }
        ret = smbrun(add_script,NULL);
        flush_pwnam_cache();
        DEBUG(ret ? 0 : 3,
                ("smb_create_user: Running the command `%s' gave %d\n",
                 add_script,ret));
        return ret;
}

/****************************************************************************
 Create an auth_usersupplied_data structure
****************************************************************************/

static NTSTATUS make_user_info(auth_usersupplied_info **user_info,
                               const char *smb_name,
                               const char *internal_username,
                               const char *client_domain,
                               const char *domain,
                               const char *wksta_name,
                               DATA_BLOB *lm_pwd, DATA_BLOB *nt_pwd,
                               DATA_BLOB *lm_interactive_pwd, DATA_BLOB *nt_interactive_pwd,
                               DATA_BLOB *plaintext,
                               bool encrypted)
{

        DEBUG(5,("attempting to make a user_info for %s (%s)\n", internal_username, smb_name));

        *user_info = SMB_MALLOC_P(auth_usersupplied_info);
        if (*user_info == NULL) {
                DEBUG(0,("malloc failed for user_info (size %lu)\n", (unsigned long)sizeof(*user_info)));
                return NT_STATUS_NO_MEMORY;
        }

        ZERO_STRUCTP(*user_info);

        DEBUG(5,("making strings for %s's user_info struct\n", internal_username));

        (*user_info)->smb_name = SMB_STRDUP(smb_name);
        if ((*user_info)->smb_name == NULL) { 
                free_user_info(user_info);
                return NT_STATUS_NO_MEMORY;
        }
        
        (*user_info)->internal_username = SMB_STRDUP(internal_username);
        if ((*user_info)->internal_username == NULL) { 
                free_user_info(user_info);
                return NT_STATUS_NO_MEMORY;
        }

        (*user_info)->domain = SMB_STRDUP(domain);
        if ((*user_info)->domain == NULL) { 
                free_user_info(user_info);
                return NT_STATUS_NO_MEMORY;
        }

        (*user_info)->client_domain = SMB_STRDUP(client_domain);
        if ((*user_info)->client_domain == NULL) { 
                free_user_info(user_info);
                return NT_STATUS_NO_MEMORY;
        }

        (*user_info)->wksta_name = SMB_STRDUP(wksta_name);
        if ((*user_info)->wksta_name == NULL) { 
                free_user_info(user_info);
                return NT_STATUS_NO_MEMORY;
        }

        DEBUG(5,("making blobs for %s's user_info struct\n", internal_username));

        if (lm_pwd)
                (*user_info)->lm_resp = data_blob(lm_pwd->data, lm_pwd->length);
        if (nt_pwd)
                (*user_info)->nt_resp = data_blob(nt_pwd->data, nt_pwd->length);
        if (lm_interactive_pwd)
                (*user_info)->lm_interactive_pwd = data_blob(lm_interactive_pwd->data, lm_interactive_pwd->length);
        if (nt_interactive_pwd)
                (*user_info)->nt_interactive_pwd = data_blob(nt_interactive_pwd->data, nt_interactive_pwd->length);

        if (plaintext)
                (*user_info)->plaintext_password = data_blob(plaintext->data, plaintext->length);

        (*user_info)->encrypted = encrypted;

        (*user_info)->logon_parameters = 0;

        DEBUG(10,("made an %sencrypted user_info for %s (%s)\n", encrypted ? "":"un" , internal_username, smb_name));

        return NT_STATUS_OK;
}

/****************************************************************************
 Create an auth_usersupplied_data structure after appropriate mapping.
****************************************************************************/

NTSTATUS make_user_info_map(auth_usersupplied_info **user_info,
                            const char *smb_name,
                            const char *client_domain,
                            const char *wksta_name,
                            DATA_BLOB *lm_pwd,
                            DATA_BLOB *nt_pwd,
                            DATA_BLOB *lm_interactive_pwd,
                            DATA_BLOB *nt_interactive_pwd,
                            DATA_BLOB *plaintext,
                            bool encrypted)
{
        struct smbd_server_connection *sconn = smbd_server_conn;
        const char *domain;
        NTSTATUS result;
        bool was_mapped;
        fstring internal_username;
        fstrcpy(internal_username, smb_name);
        was_mapped = map_username(sconn, internal_username);

        DEBUG(5, ("Mapping user [%s]\\[%s] from workstation [%s]\n",
                 client_domain, smb_name, wksta_name));

        domain = client_domain;

        /* If you connect to a Windows domain member using a bogus domain name,
         * the Windows box will map the BOGUS\user to SAMNAME\user.  Thus, if
         * the Windows box is a DC the name will become DOMAIN\user and be
         * authenticated against AD, if the Windows box is a member server but
         * not a DC the name will become WORKSTATION\user.  A standalone
         * non-domain member box will also map to WORKSTATION\user.
         * This also deals with the client passing in a "" domain */

        if (!is_trusted_domain(domain) &&
            !strequal(domain, my_sam_name()))
        {
                if (lp_map_untrusted_to_domain())
                        domain = my_sam_name();
                else
                        domain = get_global_sam_name();
                DEBUG(5, ("Mapped domain from [%s] to [%s] for user [%s] from "
                          "workstation [%s]\n",
                          client_domain, domain, smb_name, wksta_name));
        }

        /* We know that the given domain is trusted (and we are allowing them),
         * it is our global SAM name, or for legacy behavior it is our
         * primary domain name */

        result = make_user_info(user_info, smb_name, internal_username,
                              client_domain, domain, wksta_name,
                              lm_pwd, nt_pwd,
                              lm_interactive_pwd, nt_interactive_pwd,
                              plaintext, encrypted);
        if (NT_STATUS_IS_OK(result)) {
                (*user_info)->was_mapped = was_mapped;
        }
        return result;
}

/****************************************************************************
 Create an auth_usersupplied_data, making the DATA_BLOBs here. 
 Decrypt and encrypt the passwords.
****************************************************************************/

bool make_user_info_netlogon_network(auth_usersupplied_info **user_info, 
                                     const char *smb_name, 
                                     const char *client_domain, 
                                     const char *wksta_name, 
                                     uint32 logon_parameters,
                                     const uchar *lm_network_pwd,
                                     int lm_pwd_len,
                                     const uchar *nt_network_pwd,
                                     int nt_pwd_len)
{
        bool ret;
        NTSTATUS status;
        DATA_BLOB lm_blob = data_blob(lm_network_pwd, lm_pwd_len);
        DATA_BLOB nt_blob = data_blob(nt_network_pwd, nt_pwd_len);

        status = make_user_info_map(user_info,
                                    smb_name, client_domain, 
                                    wksta_name, 
                                    lm_pwd_len ? &lm_blob : NULL, 
                                    nt_pwd_len ? &nt_blob : NULL,
                                    NULL, NULL, NULL,
                                    True);

        if (NT_STATUS_IS_OK(status)) {
                (*user_info)->logon_parameters = logon_parameters;
        }
        ret = NT_STATUS_IS_OK(status) ? True : False;

        data_blob_free(&lm_blob);
        data_blob_free(&nt_blob);
        return ret;
}

/****************************************************************************
 Create an auth_usersupplied_data, making the DATA_BLOBs here. 
 Decrypt and encrypt the passwords.
****************************************************************************/

bool make_user_info_netlogon_interactive(auth_usersupplied_info **user_info, 
                                         const char *smb_name, 
                                         const char *client_domain, 
                                         const char *wksta_name, 
                                         uint32 logon_parameters,
                                         const uchar chal[8], 
                                         const uchar lm_interactive_pwd[16], 
                                         const uchar nt_interactive_pwd[16], 
                                         const uchar *dc_sess_key)
{
        unsigned char lm_pwd[16];
        unsigned char nt_pwd[16];
        unsigned char local_lm_response[24];
        unsigned char local_nt_response[24];
        unsigned char key[16];
        
        memcpy(key, dc_sess_key, 16);
        
        if (lm_interactive_pwd)
                memcpy(lm_pwd, lm_interactive_pwd, sizeof(lm_pwd));

        if (nt_interactive_pwd)
                memcpy(nt_pwd, nt_interactive_pwd, sizeof(nt_pwd));
        
#ifdef DEBUG_PASSWORD
        DEBUG(100,("key:"));
        dump_data(100, key, sizeof(key));
        
        DEBUG(100,("lm owf password:"));
        dump_data(100, lm_pwd, sizeof(lm_pwd));
        
        DEBUG(100,("nt owf password:"));
        dump_data(100, nt_pwd, sizeof(nt_pwd));
#endif
        
        if (lm_interactive_pwd)
                arcfour_crypt(lm_pwd, key, sizeof(lm_pwd));
        
        if (nt_interactive_pwd)
                arcfour_crypt(nt_pwd, key, sizeof(nt_pwd));
        
#ifdef DEBUG_PASSWORD
        DEBUG(100,("decrypt of lm owf password:"));
        dump_data(100, lm_pwd, sizeof(lm_pwd));
        
        DEBUG(100,("decrypt of nt owf password:"));
        dump_data(100, nt_pwd, sizeof(nt_pwd));
#endif
        
        if (lm_interactive_pwd)
                SMBOWFencrypt(lm_pwd, chal,
                              local_lm_response);

        if (nt_interactive_pwd)
                SMBOWFencrypt(nt_pwd, chal,
                              local_nt_response);
        
        /* Password info paranoia */
        ZERO_STRUCT(key);

        {
                bool ret;
                NTSTATUS nt_status;
                DATA_BLOB local_lm_blob;
                DATA_BLOB local_nt_blob;

                DATA_BLOB lm_interactive_blob;
                DATA_BLOB nt_interactive_blob;
                
                if (lm_interactive_pwd) {
                        local_lm_blob = data_blob(local_lm_response,
                                                  sizeof(local_lm_response));
                        lm_interactive_blob = data_blob(lm_pwd,
                                                        sizeof(lm_pwd));
                        ZERO_STRUCT(lm_pwd);
                }
                
                if (nt_interactive_pwd) {
                        local_nt_blob = data_blob(local_nt_response,
                                                  sizeof(local_nt_response));
                        nt_interactive_blob = data_blob(nt_pwd,
                                                        sizeof(nt_pwd));
                        ZERO_STRUCT(nt_pwd);
                }

                nt_status = make_user_info_map(
                        user_info, 
                        smb_name, client_domain, wksta_name, 
                        lm_interactive_pwd ? &local_lm_blob : NULL,
                        nt_interactive_pwd ? &local_nt_blob : NULL,
                        lm_interactive_pwd ? &lm_interactive_blob : NULL,
                        nt_interactive_pwd ? &nt_interactive_blob : NULL,
                        NULL, True);

                if (NT_STATUS_IS_OK(nt_status)) {
                        (*user_info)->logon_parameters = logon_parameters;
                }

                ret = NT_STATUS_IS_OK(nt_status) ? True : False;
                data_blob_free(&local_lm_blob);
                data_blob_free(&local_nt_blob);
                data_blob_free(&lm_interactive_blob);
                data_blob_free(&nt_interactive_blob);
                return ret;
        }
}


/****************************************************************************
 Create an auth_usersupplied_data structure
****************************************************************************/

bool make_user_info_for_reply(auth_usersupplied_info **user_info, 
                              const char *smb_name, 
                              const char *client_domain,
                              const uint8 chal[8],
                              DATA_BLOB plaintext_password)
{

        DATA_BLOB local_lm_blob;
        DATA_BLOB local_nt_blob;
        NTSTATUS ret = NT_STATUS_UNSUCCESSFUL;
                        
        /*
         * Not encrypted - do so.
         */
        
        DEBUG(5,("make_user_info_for_reply: User passwords not in encrypted "
                 "format.\n"));
        
        if (plaintext_password.data) {
                unsigned char local_lm_response[24];
                
#ifdef DEBUG_PASSWORD
                DEBUG(10,("Unencrypted password (len %d):\n",
                          (int)plaintext_password.length));
                dump_data(100, plaintext_password.data,
                          plaintext_password.length);
#endif

                SMBencrypt( (const char *)plaintext_password.data,
                            (const uchar*)chal, local_lm_response);
                local_lm_blob = data_blob(local_lm_response, 24);
                
                /* We can't do an NT hash here, as the password needs to be
                   case insensitive */
                local_nt_blob = data_blob_null; 
                
        } else {
                local_lm_blob = data_blob_null; 
                local_nt_blob = data_blob_null; 
        }
        
        ret = make_user_info_map(
                user_info, smb_name, client_domain, 
                get_remote_machine_name(),
                local_lm_blob.data ? &local_lm_blob : NULL,
                local_nt_blob.data ? &local_nt_blob : NULL,
                NULL, NULL,
                plaintext_password.data ? &plaintext_password : NULL, 
                False);
        
        data_blob_free(&local_lm_blob);
        return NT_STATUS_IS_OK(ret) ? True : False;
}

/****************************************************************************
 Create an auth_usersupplied_data structure
****************************************************************************/

NTSTATUS make_user_info_for_reply_enc(auth_usersupplied_info **user_info, 
                                      const char *smb_name,
                                      const char *client_domain, 
                                      DATA_BLOB lm_resp, DATA_BLOB nt_resp)
{
        return make_user_info_map(user_info, smb_name, 
                                  client_domain, 
                                  get_remote_machine_name(), 
                                  lm_resp.data ? &lm_resp : NULL, 
                                  nt_resp.data ? &nt_resp : NULL, 
                                  NULL, NULL, NULL,
                                  True);
}

/****************************************************************************
 Create a guest user_info blob, for anonymous authenticaion.
****************************************************************************/

bool make_user_info_guest(auth_usersupplied_info **user_info) 
{
        NTSTATUS nt_status;

        nt_status = make_user_info(user_info, 
                                   "","", 
                                   "","", 
                                   "", 
                                   NULL, NULL, 
                                   NULL, NULL, 
                                   NULL,
                                   True);
                              
        return NT_STATUS_IS_OK(nt_status) ? True : False;
}

static int server_info_dtor(auth_serversupplied_info *server_info)
{
        TALLOC_FREE(server_info->sam_account);
        ZERO_STRUCTP(server_info);
        return 0;
}

/***************************************************************************
 Make a server_info struct. Free with TALLOC_FREE().
***************************************************************************/

static auth_serversupplied_info *make_server_info(TALLOC_CTX *mem_ctx)
{
        struct auth_serversupplied_info *result;

        result = TALLOC_ZERO_P(mem_ctx, auth_serversupplied_info);
        if (result == NULL) {
                DEBUG(0, ("talloc failed\n"));
                return NULL;
        }

        talloc_set_destructor(result, server_info_dtor);

        /* Initialise the uid and gid values to something non-zero
           which may save us from giving away root access if there
           is a bug in allocating these fields. */

        result->utok.uid = -1;
        result->utok.gid = -1;
        return result;
}

static char *sanitize_username(TALLOC_CTX *mem_ctx, const char *username)
{
        fstring tmp;

        alpha_strcpy(tmp, username, ". _-$", sizeof(tmp));
        return talloc_strdup(mem_ctx, tmp);
}

/***************************************************************************
 Is the incoming username our own machine account ?
 If so, the connection is almost certainly from winbindd.
***************************************************************************/

static bool is_our_machine_account(const char *username)
{
        bool ret;
        char *truncname = NULL;
        size_t ulen = strlen(username);

        if (ulen == 0 || username[ulen-1] != '$') {
                return false;
        }
        truncname = SMB_STRDUP(username);
        if (!truncname) {
                return false;
        }
        truncname[ulen-1] = '\0';
        ret = strequal(truncname, global_myname());
        SAFE_FREE(truncname);
        return ret;
}

/***************************************************************************
 Make (and fill) a user_info struct from a struct samu
***************************************************************************/

NTSTATUS make_server_info_sam(auth_serversupplied_info **server_info,
                              struct samu *sampass)
{
        struct passwd *pwd;
        gid_t *gids;
        auth_serversupplied_info *result;
        const char *username = pdb_get_username(sampass);
        NTSTATUS status;

        if ( !(result = make_server_info(NULL)) ) {
                return NT_STATUS_NO_MEMORY;
        }

        if ( !(pwd = getpwnam_alloc(result, username)) ) {
                DEBUG(1, ("User %s in passdb, but getpwnam() fails!\n",
                          pdb_get_username(sampass)));
                TALLOC_FREE(result);
                return NT_STATUS_NO_SUCH_USER;
        }

        result->sam_account = sampass;
        result->unix_name = pwd->pw_name;
        /* Ensure that we keep pwd->pw_name, because we will free pwd below */
        talloc_steal(result, pwd->pw_name);
        result->utok.gid = pwd->pw_gid;
        result->utok.uid = pwd->pw_uid;

        TALLOC_FREE(pwd);

        result->sanitized_username = sanitize_username(result,
                                                       result->unix_name);
        if (result->sanitized_username == NULL) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (IS_DC && is_our_machine_account(username)) {
                /*
                 * Ensure for a connection from our own
                 * machine account (from winbindd on a DC)
                 * there are no supplementary groups.
                 * Prevents loops in calling gid_to_sid().
                 */
                result->sids = NULL;
                gids = NULL;
                result->num_sids = 0;

                /*
                 * This is a hack of monstrous proportions.
                 * If we know it's winbindd talking to us,
                 * we know we must never recurse into it,
                 * so turn off contacting winbindd for this
                 * entire process. This will get fixed when
                 * winbindd doesn't need to talk to smbd on
                 * a PDC. JRA.
                 */

                (void)winbind_off();

                DEBUG(10, ("make_server_info_sam: our machine account %s "
                        "setting supplementary group list empty and "
                        "turning off winbindd requests.\n",
                        username));
        } else {
                status = pdb_enum_group_memberships(result, sampass,
                                            &result->sids, &gids,
                                            &result->num_sids);

                if (!NT_STATUS_IS_OK(status)) {
                        DEBUG(10, ("pdb_enum_group_memberships failed: %s\n",
                                   nt_errstr(status)));
                        result->sam_account = NULL; /* Don't free on error exit. */
                        TALLOC_FREE(result);
                        return status;
                }
        }

        /* For now we throw away the gids and convert via sid_to_gid
         * later. This needs fixing, but I'd like to get the code straight and
         * simple first. */
         
        TALLOC_FREE(gids);

        DEBUG(5,("make_server_info_sam: made server info for user %s -> %s\n",
                 pdb_get_username(sampass), result->unix_name));

        *server_info = result;
        /* Ensure that the sampass will be freed with the result */
        talloc_steal(result, sampass);

        return NT_STATUS_OK;
}

static NTSTATUS log_nt_token(NT_USER_TOKEN *token)
{
        TALLOC_CTX *frame = talloc_stackframe();
        char *command;
        char *group_sidstr;
        size_t i;

        if ((lp_log_nt_token_command() == NULL) ||
            (strlen(lp_log_nt_token_command()) == 0)) {
                TALLOC_FREE(frame);
                return NT_STATUS_OK;
        }

        group_sidstr = talloc_strdup(frame, "");
        for (i=1; i<token->num_sids; i++) {
                group_sidstr = talloc_asprintf(
                        frame, "%s %s", group_sidstr,
                        sid_string_talloc(frame, &token->user_sids[i]));
        }

        command = talloc_string_sub(
                frame, lp_log_nt_token_command(),
                "%s", sid_string_talloc(frame, &token->user_sids[0]));
        command = talloc_string_sub(frame, command, "%t", group_sidstr);

        if (command == NULL) {
                TALLOC_FREE(frame);
                return NT_STATUS_NO_MEMORY;
        }

        DEBUG(8, ("running command: [%s]\n", command));
        if (smbrun(command, NULL) != 0) {
                DEBUG(0, ("Could not log NT token\n"));
                TALLOC_FREE(frame);
                return NT_STATUS_ACCESS_DENIED;
        }

        TALLOC_FREE(frame);
        return NT_STATUS_OK;
}

/*
 * Create the token to use from server_info->sam_account and
 * server_info->sids (the info3/sam groups). Find the unix gids.
 */

NTSTATUS create_local_token(auth_serversupplied_info *server_info)
{
        NTSTATUS status;
        size_t i;
        struct dom_sid tmp_sid;

        /*
         * If winbind is not around, we can not make much use of the SIDs the
         * domain controller provided us with. Likewise if the user name was
         * mapped to some local unix user.
         */

        if (((lp_server_role() == ROLE_DOMAIN_MEMBER) && !winbind_ping()) ||
            (server_info->nss_token)) {
                status = create_token_from_username(server_info,
                                                    server_info->unix_name,
                                                    server_info->guest,
                                                    &server_info->utok.uid,
                                                    &server_info->utok.gid,
                                                    &server_info->unix_name,
                                                    &server_info->ptok);

        } else {
                server_info->ptok = create_local_nt_token(
                        server_info,
                        pdb_get_user_sid(server_info->sam_account),
                        server_info->guest,
                        server_info->num_sids, server_info->sids);
                status = server_info->ptok ?
                        NT_STATUS_OK : NT_STATUS_NO_SUCH_USER;
        }

        if (!NT_STATUS_IS_OK(status)) {
                return status;
        }

        /* Convert the SIDs to gids. */

        server_info->utok.ngroups = 0;
        server_info->utok.groups = NULL;

        /* Start at index 1, where the groups start. */

        for (i=1; i<server_info->ptok->num_sids; i++) {
                gid_t gid;
                DOM_SID *sid = &server_info->ptok->user_sids[i];

                if (!sid_to_gid(sid, &gid)) {
                        DEBUG(10, ("Could not convert SID %s to gid, "
                                   "ignoring it\n", sid_string_dbg(sid)));
                        continue;
                }
                add_gid_to_array_unique(server_info, gid,
                                        &server_info->utok.groups,
                                        &server_info->utok.ngroups);
        }

        /*
         * Add the "Unix Group" SID for each gid to catch mapped groups
         * and their Unix equivalent.  This is to solve the backwards
         * compatibility problem of 'valid users = +ntadmin' where
         * ntadmin has been paired with "Domain Admins" in the group
         * mapping table.  Otherwise smb.conf would need to be changed
         * to 'valid user = "Domain Admins"'.  --jerry
         *
         * For consistency we also add the "Unix User" SID,
         * so that the complete unix token is represented within
         * the nt token.
         */

        if (!uid_to_unix_users_sid(server_info->utok.uid, &tmp_sid)) {
                DEBUG(1,("create_local_token: Failed to create SID "
                        "for uid %u!\n", (unsigned int)server_info->utok.uid));
        }
        add_sid_to_array_unique(server_info->ptok, &tmp_sid,
                                &server_info->ptok->user_sids,
                                &server_info->ptok->num_sids);

        for ( i=0; i<server_info->utok.ngroups; i++ ) {
                if (!gid_to_unix_groups_sid( server_info->utok.groups[i], &tmp_sid ) ) {
                        DEBUG(1,("create_local_token: Failed to create SID "
                                "for gid %u!\n", (unsigned int)server_info->utok.groups[i]));
                        continue;
                }
                add_sid_to_array_unique(server_info->ptok, &tmp_sid,
                                        &server_info->ptok->user_sids,
                                        &server_info->ptok->num_sids);
        }

        debug_nt_user_token(DBGC_AUTH, 10, server_info->ptok);
        debug_unix_user_token(DBGC_AUTH, 10,
                              server_info->utok.uid,
                              server_info->utok.gid,
                              server_info->utok.ngroups,
                              server_info->utok.groups);

        status = log_nt_token(server_info->ptok);
        return status;
}

/*
 * Create an artificial NT token given just a username. (Initially intended
 * for force user)
 *
 * We go through lookup_name() to avoid problems we had with 'winbind use
 * default domain'.
 *
 * We have 3 cases:
 *
 * unmapped unix users: Go directly to nss to find the user's group.
 *
 * A passdb user: The list of groups is provided by pdb_enum_group_memberships.
 *
 * If the user is provided by winbind, the primary gid is set to "domain
 * users" of the user's domain. For an explanation why this is necessary, see
 * the thread starting at
 * http://lists.samba.org/archive/samba-technical/2006-January/044803.html.
 */

NTSTATUS create_token_from_username(TALLOC_CTX *mem_ctx, const char *username,
                                    bool is_guest,
                                    uid_t *uid, gid_t *gid,
                                    char **found_username,
                                    struct nt_user_token **token)
{
        NTSTATUS result = NT_STATUS_NO_SUCH_USER;
        TALLOC_CTX *tmp_ctx;
        DOM_SID user_sid;
        enum lsa_SidType type;
        gid_t *gids;
        DOM_SID *group_sids;
        DOM_SID unix_group_sid;
        size_t num_group_sids;
        size_t num_gids;
        size_t i;

        tmp_ctx = talloc_new(NULL);
        if (tmp_ctx == NULL) {
                DEBUG(0, ("talloc_new failed\n"));
                return NT_STATUS_NO_MEMORY;
        }

        if (!lookup_name_smbconf(tmp_ctx, username, LOOKUP_NAME_ALL,
                         NULL, NULL, &user_sid, &type)) {
                DEBUG(1, ("lookup_name_smbconf for %s failed\n", username));
                goto done;
        }

        if (type != SID_NAME_USER) {
                DEBUG(1, ("%s is a %s, not a user\n", username,
                          sid_type_lookup(type)));
                goto done;
        }

        if (sid_check_is_in_our_domain(&user_sid)) {
                bool ret;

                /* This is a passdb user, so ask passdb */

                struct samu *sam_acct = NULL;

                if ( !(sam_acct = samu_new( tmp_ctx )) ) {
                        result = NT_STATUS_NO_MEMORY;
                        goto done;
                }

                become_root();
                ret = pdb_getsampwsid(sam_acct, &user_sid);
                unbecome_root();

                if (!ret) {
                        DEBUG(1, ("pdb_getsampwsid(%s) for user %s failed\n",
                                  sid_string_dbg(&user_sid), username));
                        DEBUGADD(1, ("Fall back to unix user %s\n", username));
                        goto unix_user;
                }

                result = pdb_enum_group_memberships(tmp_ctx, sam_acct,
                                                    &group_sids, &gids,
                                                    &num_group_sids);
                if (!NT_STATUS_IS_OK(result)) {
                        DEBUG(1, ("enum_group_memberships failed for %s (%s): "
                                  "%s\n", username, sid_string_dbg(&user_sid),
                                  nt_errstr(result)));
                        DEBUGADD(1, ("Fall back to unix user %s\n", username));
                        goto unix_user;
                }

                /* see the smb_panic() in pdb_default_enum_group_memberships */
                SMB_ASSERT(num_group_sids > 0); 

                *gid = gids[0];

                /* Ensure we're returning the found_username on the right context. */
                *found_username = talloc_strdup(mem_ctx,
                                                pdb_get_username(sam_acct));

                /*
                 * If the SID from lookup_name() was the guest sid, passdb knows
                 * about the mapping of guest sid to lp_guestaccount()
                 * username and will return the unix_pw info for a guest
                 * user. Use it if it's there, else lookup the *uid details
                 * using getpwnam_alloc(). See bug #6291 for details. JRA.
                 */

                /* We must always assign the *uid. */
                if (sam_acct->unix_pw == NULL) {
                        struct passwd *pwd = getpwnam_alloc(sam_acct, *found_username );
                        if (!pwd) {
                                DEBUG(10, ("getpwnam_alloc failed for %s\n",
                                        *found_username));
                                result = NT_STATUS_NO_SUCH_USER;
                                goto done;
                        }
                        result = samu_set_unix(sam_acct, pwd );
                        if (!NT_STATUS_IS_OK(result)) {
                                DEBUG(10, ("samu_set_unix failed for %s\n",
                                        *found_username));
                                result = NT_STATUS_NO_SUCH_USER;
                                goto done;
                        }
                }
                *uid = sam_acct->unix_pw->pw_uid;

        } else  if (sid_check_is_in_unix_users(&user_sid)) {

                /* This is a unix user not in passdb. We need to ask nss
                 * directly, without consulting passdb */

                struct passwd *pass;

                /*
                 * This goto target is used as a fallback for the passdb
                 * case. The concrete bug report is when passdb gave us an
                 * unmapped gid.
                 */

        unix_user:

                if (!sid_to_uid(&user_sid, uid)) {
                        DEBUG(1, ("unix_user case, sid_to_uid for %s (%s) failed\n",
                                  username, sid_string_dbg(&user_sid)));
                        result = NT_STATUS_NO_SUCH_USER;
                        goto done;
                }

                uid_to_unix_users_sid(*uid, &user_sid);

                pass = getpwuid_alloc(tmp_ctx, *uid);
                if (pass == NULL) {
                        DEBUG(1, ("getpwuid(%u) for user %s failed\n",
                                  (unsigned int)*uid, username));
                        goto done;
                }

                if (!getgroups_unix_user(tmp_ctx, username, pass->pw_gid,
                                         &gids, &num_group_sids)) {
                        DEBUG(1, ("getgroups_unix_user for user %s failed\n",
                                  username));
                        goto done;
                }

                if (num_group_sids) {
                        group_sids = TALLOC_ARRAY(tmp_ctx, DOM_SID, num_group_sids);
                        if (group_sids == NULL) {
                                DEBUG(1, ("TALLOC_ARRAY failed\n"));
                                result = NT_STATUS_NO_MEMORY;
                                goto done;
                        }
                } else {
                        group_sids = NULL;
                }

                for (i=0; i<num_group_sids; i++) {
                        gid_to_sid(&group_sids[i], gids[i]);
                }

                /* In getgroups_unix_user we always set the primary gid */
                SMB_ASSERT(num_group_sids > 0); 

                *gid = gids[0];

                /* Ensure we're returning the found_username on the right context. */
                *found_username = talloc_strdup(mem_ctx, pass->pw_name);
        } else {

                /* This user is from winbind, force the primary gid to the
                 * user's "domain users" group. Under certain circumstances
                 * (user comes from NT4), this might be a loss of
                 * information. But we can not rely on winbind getting the
                 * correct info. AD might prohibit winbind looking up that
                 * information. */

                uint32 dummy;

                /* We must always assign the *uid. */
                if (!sid_to_uid(&user_sid, uid)) {
                        DEBUG(1, ("winbindd case, sid_to_uid for %s (%s) failed\n",
                                  username, sid_string_dbg(&user_sid)));
                        result = NT_STATUS_NO_SUCH_USER;
                        goto done;
                }

                num_group_sids = 1;
                group_sids = TALLOC_ARRAY(tmp_ctx, DOM_SID, num_group_sids);
                if (group_sids == NULL) {
                        DEBUG(1, ("TALLOC_ARRAY failed\n"));
                        result = NT_STATUS_NO_MEMORY;
                        goto done;
                }

                sid_copy(&group_sids[0], &user_sid);
                sid_split_rid(&group_sids[0], &dummy);
                sid_append_rid(&group_sids[0], DOMAIN_GROUP_RID_USERS);

                if (!sid_to_gid(&group_sids[0], gid)) {
                        DEBUG(1, ("sid_to_gid(%s) failed\n",
                                  sid_string_dbg(&group_sids[0])));
                        goto done;
                }

                gids = gid;

                /* Ensure we're returning the found_username on the right context. */
                *found_username = talloc_strdup(mem_ctx, username);
        }

        /* Add the "Unix Group" SID for each gid to catch mapped groups
           and their Unix equivalent.  This is to solve the backwards
           compatibility problem of 'valid users = +ntadmin' where
           ntadmin has been paired with "Domain Admins" in the group
           mapping table.  Otherwise smb.conf would need to be changed
           to 'valid user = "Domain Admins"'.  --jerry */

        num_gids = num_group_sids;
        for ( i=0; i<num_gids; i++ ) {
                gid_t high, low;

                /* don't pickup anything managed by Winbind */

                if ( lp_idmap_gid(&low, &high) && (gids[i] >= low) && (gids[i] <= high) )
                        continue;

                if ( !gid_to_unix_groups_sid( gids[i], &unix_group_sid ) ) {
                        DEBUG(1,("create_token_from_username: Failed to create SID "
                                "for gid %u!\n", (unsigned int)gids[i]));
                        continue;
                }
                result = add_sid_to_array_unique(tmp_ctx, &unix_group_sid,
                                                 &group_sids, &num_group_sids);
                if (!NT_STATUS_IS_OK(result)) {
                        goto done;
                }
        }

        /* Ensure we're creating the nt_token on the right context. */
        *token = create_local_nt_token(mem_ctx, &user_sid,
                                       is_guest, num_group_sids, group_sids);

        if ((*token == NULL) || (*found_username == NULL)) {
                result = NT_STATUS_NO_MEMORY;
                goto done;
        }

        result = NT_STATUS_OK;
 done:
        TALLOC_FREE(tmp_ctx);
        return result;
}

/***************************************************************************
 Build upon create_token_from_username:

 Expensive helper function to figure out whether a user given its name is
 member of a particular group.
***************************************************************************/

bool user_in_group_sid(const char *username, const DOM_SID *group_sid)
{
        NTSTATUS status;
        uid_t uid;
        gid_t gid;
        char *found_username;
        struct nt_user_token *token;
        bool result;

        TALLOC_CTX *mem_ctx;

        mem_ctx = talloc_new(NULL);
        if (mem_ctx == NULL) {
                DEBUG(0, ("talloc_new failed\n"));
                return False;
        }

        status = create_token_from_username(mem_ctx, username, False,
                                            &uid, &gid, &found_username,
                                            &token);

        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(10, ("could not create token for %s\n", username));
                return False;
        }

        result = nt_token_check_sid(group_sid, token);

        TALLOC_FREE(mem_ctx);
        return result;
        
}

bool user_in_group(const char *username, const char *groupname)
{
        TALLOC_CTX *mem_ctx;
        DOM_SID group_sid;
        bool ret;

        mem_ctx = talloc_new(NULL);
        if (mem_ctx == NULL) {
                DEBUG(0, ("talloc_new failed\n"));
                return False;
        }

        ret = lookup_name(mem_ctx, groupname, LOOKUP_NAME_ALL,
                          NULL, NULL, &group_sid, NULL);
        TALLOC_FREE(mem_ctx);

        if (!ret) {
                DEBUG(10, ("lookup_name for (%s) failed.\n", groupname));
                return False;
        }

        return user_in_group_sid(username, &group_sid);
}

/***************************************************************************
 Make (and fill) a server_info struct from a 'struct passwd' by conversion
 to a struct samu
***************************************************************************/

NTSTATUS make_server_info_pw(auth_serversupplied_info **server_info, 
                             char *unix_username,
                             struct passwd *pwd)
{
        NTSTATUS status;
        struct samu *sampass = NULL;
        gid_t *gids;
        char *qualified_name = NULL;
        TALLOC_CTX *mem_ctx = NULL;
        DOM_SID u_sid;
        enum lsa_SidType type;
        auth_serversupplied_info *result;
        
        if ( !(sampass = samu_new( NULL )) ) {
                return NT_STATUS_NO_MEMORY;
        }
        
        status = samu_set_unix( sampass, pwd );
        if (!NT_STATUS_IS_OK(status)) {
                return status;
        }

        result = make_server_info(NULL);
        if (result == NULL) {
                TALLOC_FREE(sampass);
                return NT_STATUS_NO_MEMORY;
        }

        result->sam_account = sampass;

        result->unix_name = talloc_strdup(result, unix_username);
        result->sanitized_username = sanitize_username(result, unix_username);

        if ((result->unix_name == NULL)
            || (result->sanitized_username == NULL)) {
                TALLOC_FREE(sampass);
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        result->utok.uid = pwd->pw_uid;
        result->utok.gid = pwd->pw_gid;

        status = pdb_enum_group_memberships(result, sampass,
                                            &result->sids, &gids,
                                            &result->num_sids);

        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(10, ("pdb_enum_group_memberships failed: %s\n",
                           nt_errstr(status)));
                TALLOC_FREE(result);
                return status;
        }

        /*
         * The SID returned in server_info->sam_account is based
         * on our SAM sid even though for a pure UNIX account this should
         * not be the case as it doesn't really exist in the SAM db.
         * This causes lookups on "[in]valid users" to fail as they
         * will lookup this name as a "Unix User" SID to check against
         * the user token. Fix this by adding the "Unix User"\unix_username
         * SID to the sid array. The correct fix should probably be
         * changing the server_info->sam_account user SID to be a
         * S-1-22 Unix SID, but this might break old configs where
         * plaintext passwords were used with no SAM backend.
         */

        mem_ctx = talloc_init("make_server_info_pw_tmp");
        if (!mem_ctx) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        qualified_name = talloc_asprintf(mem_ctx, "%s\\%s",
                                        unix_users_domain_name(),
                                        unix_username );
        if (!qualified_name) {
                TALLOC_FREE(result);
                TALLOC_FREE(mem_ctx);
                return NT_STATUS_NO_MEMORY;
        }

        if (!lookup_name(mem_ctx, qualified_name, LOOKUP_NAME_ALL,
                                                NULL, NULL,
                                                &u_sid, &type)) {
                TALLOC_FREE(result);
                TALLOC_FREE(mem_ctx);
                return NT_STATUS_NO_SUCH_USER;
        }

        TALLOC_FREE(mem_ctx);

        if (type != SID_NAME_USER) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_SUCH_USER;
        }

        status = add_sid_to_array_unique(result, &u_sid,
                                         &result->sids,
                                         &result->num_sids);
        if (!NT_STATUS_IS_OK(status)) {
                TALLOC_FREE(result);
                return status;
        }

        /* For now we throw away the gids and convert via sid_to_gid
         * later. This needs fixing, but I'd like to get the code straight and
         * simple first. */
        TALLOC_FREE(gids);

        *server_info = result;

        return NT_STATUS_OK;
}

/***************************************************************************
 Make (and fill) a user_info struct for a guest login.
 This *must* succeed for smbd to start. If there is no mapping entry for
 the guest gid, then create one.
***************************************************************************/

static NTSTATUS make_new_server_info_guest(auth_serversupplied_info **server_info)
{
        NTSTATUS status;
        struct samu *sampass = NULL;
        DOM_SID guest_sid;
        bool ret;
        char zeros[16];
        fstring tmp;

        if ( !(sampass = samu_new( NULL )) ) {
                return NT_STATUS_NO_MEMORY;
        }

        sid_copy(&guest_sid, get_global_sam_sid());
        sid_append_rid(&guest_sid, DOMAIN_USER_RID_GUEST);

        become_root();
        ret = pdb_getsampwsid(sampass, &guest_sid);
        unbecome_root();

        if (!ret) {
                TALLOC_FREE(sampass);
                return NT_STATUS_NO_SUCH_USER;
        }

        status = make_server_info_sam(server_info, sampass);
        if (!NT_STATUS_IS_OK(status)) {
                TALLOC_FREE(sampass);
                return status;
        }
        
        (*server_info)->guest = True;

        status = create_local_token(*server_info);
        if (!NT_STATUS_IS_OK(status)) {
                DEBUG(10, ("create_local_token failed: %s\n",
                           nt_errstr(status)));
                return status;
        }

        /* annoying, but the Guest really does have a session key, and it is
           all zeros! */
        ZERO_STRUCT(zeros);
        (*server_info)->user_session_key = data_blob(zeros, sizeof(zeros));
        (*server_info)->lm_session_key = data_blob(zeros, sizeof(zeros));

        alpha_strcpy(tmp, pdb_get_username(sampass), ". _-$", sizeof(tmp));
        (*server_info)->sanitized_username = talloc_strdup(*server_info, tmp);

        return NT_STATUS_OK;
}

/****************************************************************************
  Fake a auth_serversupplied_info just from a username
****************************************************************************/

NTSTATUS make_serverinfo_from_username(TALLOC_CTX *mem_ctx,
                                       const char *username,
                                       bool is_guest,
                                       struct auth_serversupplied_info **presult)
{
        struct auth_serversupplied_info *result;
        struct passwd *pwd;
        NTSTATUS status;

        pwd = getpwnam_alloc(talloc_tos(), username);
        if (pwd == NULL) {
                return NT_STATUS_NO_SUCH_USER;
        }

        status = make_server_info_pw(&result, pwd->pw_name, pwd);

        TALLOC_FREE(pwd);

        if (!NT_STATUS_IS_OK(status)) {
                return status;
        }

        result->nss_token = true;
        result->guest = is_guest;

        status = create_local_token(result);

        if (!NT_STATUS_IS_OK(status)) {
                TALLOC_FREE(result);
                return status;
        }

        *presult = result;
        return NT_STATUS_OK;
}


struct auth_serversupplied_info *copy_serverinfo(TALLOC_CTX *mem_ctx,
                                                 const auth_serversupplied_info *src)
{
        auth_serversupplied_info *dst;

        dst = make_server_info(mem_ctx);
        if (dst == NULL) {
                return NULL;
        }

        dst->guest = src->guest;
        dst->utok.uid = src->utok.uid;
        dst->utok.gid = src->utok.gid;
        dst->utok.ngroups = src->utok.ngroups;
        if (src->utok.ngroups != 0) {
                dst->utok.groups = (gid_t *)TALLOC_MEMDUP(
                        dst, src->utok.groups,
                        sizeof(gid_t)*dst->utok.ngroups);
        } else {
                dst->utok.groups = NULL;
        }

        if (src->ptok) {
                dst->ptok = dup_nt_token(dst, src->ptok);
                if (!dst->ptok) {
                        TALLOC_FREE(dst);
                        return NULL;
                }
        }
        
        dst->user_session_key = data_blob_talloc( dst, src->user_session_key.data,
                                                src->user_session_key.length);

        dst->lm_session_key = data_blob_talloc(dst, src->lm_session_key.data,
                                                src->lm_session_key.length);

        dst->sam_account = samu_new(NULL);
        if (!dst->sam_account) {
                TALLOC_FREE(dst);
                return NULL;
        }

        if (!pdb_copy_sam_account(dst->sam_account, src->sam_account)) {
                TALLOC_FREE(dst);
                return NULL;
        }
        
        dst->pam_handle = NULL;
        dst->unix_name = talloc_strdup(dst, src->unix_name);
        if (!dst->unix_name) {
                TALLOC_FREE(dst);
                return NULL;
        }

        dst->sanitized_username = talloc_strdup(dst, src->sanitized_username);
        if (!dst->sanitized_username) {
                TALLOC_FREE(dst);
                return NULL;
        }

        return dst;
}

/*
 * Set a new session key. Used in the rpc server where we have to override the
 * SMB level session key with SystemLibraryDTC
 */

bool server_info_set_session_key(struct auth_serversupplied_info *info,
                                 DATA_BLOB session_key)
{
        TALLOC_FREE(info->user_session_key.data);

        info->user_session_key = data_blob_talloc(
                info, session_key.data, session_key.length);

        return (info->user_session_key.data != NULL);
}

static auth_serversupplied_info *guest_info = NULL;

bool init_guest_info(void)
{
        if (guest_info != NULL)
                return True;

        return NT_STATUS_IS_OK(make_new_server_info_guest(&guest_info));
}

NTSTATUS make_server_info_guest(TALLOC_CTX *mem_ctx,
                                auth_serversupplied_info **server_info)
{
        *server_info = copy_serverinfo(mem_ctx, guest_info);
        return (*server_info != NULL) ? NT_STATUS_OK : NT_STATUS_NO_MEMORY;
}

bool copy_current_user(struct current_user *dst, struct current_user *src)
{
        gid_t *groups;
        NT_USER_TOKEN *nt_token;

        groups = (gid_t *)memdup(src->ut.groups,
                                 sizeof(gid_t) * src->ut.ngroups);
        if ((src->ut.ngroups != 0) && (groups == NULL)) {
                return False;
        }

        nt_token = dup_nt_token(NULL, src->nt_user_token);
        if (nt_token == NULL) {
                SAFE_FREE(groups);
                return False;
        }

        dst->conn = src->conn;
        dst->vuid = src->vuid;
        dst->ut.uid = src->ut.uid;
        dst->ut.gid = src->ut.gid;
        dst->ut.ngroups = src->ut.ngroups;
        dst->ut.groups = groups;
        dst->nt_user_token = nt_token;
        return True;
}

/***************************************************************************
 Purely internal function for make_server_info_info3
 Fill the sam account from getpwnam
***************************************************************************/
static NTSTATUS fill_sam_account(TALLOC_CTX *mem_ctx, 
                                 const char *domain,
                                 const char *username,
                                 char **found_username,
                                 uid_t *uid, gid_t *gid,
                                 struct samu *account,
                                 bool *username_was_mapped)
{
        struct smbd_server_connection *sconn = smbd_server_conn;
        NTSTATUS nt_status;
        fstring dom_user, lower_username;
        fstring real_username;
        struct passwd *passwd;

        fstrcpy( lower_username, username );
        strlower_m( lower_username );

        fstr_sprintf(dom_user, "%s%c%s", domain, *lp_winbind_separator(), 
                lower_username);

        /* Get the passwd struct.  Try to create the account is necessary. */

        *username_was_mapped = map_username(sconn, dom_user);

        if ( !(passwd = smb_getpwnam( NULL, dom_user, real_username, True )) )
                return NT_STATUS_NO_SUCH_USER;

        *uid = passwd->pw_uid;
        *gid = passwd->pw_gid;

        /* This is pointless -- there is no suport for differing 
           unix and windows names.  Make sure to always store the 
           one we actually looked up and succeeded. Have I mentioned
           why I hate the 'winbind use default domain' parameter?   
                                         --jerry              */
           
        *found_username = talloc_strdup( mem_ctx, real_username );
        
        DEBUG(5,("fill_sam_account: located username was [%s]\n", *found_username));

        nt_status = samu_set_unix( account, passwd );
        
        TALLOC_FREE(passwd);
        
        return nt_status;
}

/****************************************************************************
 Wrapper to allow the getpwnam() call to strip the domain name and 
 try again in case a local UNIX user is already there.  Also run through 
 the username if we fallback to the username only.
 ****************************************************************************/
 
struct passwd *smb_getpwnam( TALLOC_CTX *mem_ctx, char *domuser,
                             fstring save_username, bool create )
{
        struct passwd *pw = NULL;
        char *p;
        fstring username;
        
        /* we only save a copy of the username it has been mangled 
           by winbindd use default domain */
           
        save_username[0] = '\0';
           
        /* don't call map_username() here since it has to be done higher 
           up the stack so we don't call it mutliple times */

        fstrcpy( username, domuser );
        
        p = strchr_m( username, *lp_winbind_separator() );
        
        /* code for a DOMAIN\user string */
        
        if ( p ) {
                fstring strip_username;

                pw = Get_Pwnam_alloc( mem_ctx, domuser );
                if ( pw ) {     
                        /* make sure we get the case of the username correct */
                        /* work around 'winbind use default domain = yes' */

                        if ( !strchr_m( pw->pw_name, *lp_winbind_separator() ) ) {
                                char *domain;
                                
                                /* split the domain and username into 2 strings */
                                *p = '\0';
                                domain = username;

                                fstr_sprintf(save_username, "%s%c%s", domain, *lp_winbind_separator(), pw->pw_name);
                        }
                        else
                                fstrcpy( save_username, pw->pw_name );

                        /* whew -- done! */             
                        return pw;
                }

                /* setup for lookup of just the username */
                /* remember that p and username are overlapping memory */

                p++;
                fstrcpy( strip_username, p );
                fstrcpy( username, strip_username );
        }
        
        /* just lookup a plain username */
        
        pw = Get_Pwnam_alloc(mem_ctx, username);
                
        /* Create local user if requested but only if winbindd
           is not running.  We need to protect against cases
           where winbindd is failing and then prematurely
           creating users in /etc/passwd */
        
        if ( !pw && create && !winbind_ping() ) {
                /* Don't add a machine account. */
                if (username[strlen(username)-1] == '$')
                        return NULL;

                _smb_create_user(NULL, username, NULL);
                pw = Get_Pwnam_alloc(mem_ctx, username);
        }
        
        /* one last check for a valid passwd struct */
        
        if ( pw )
                fstrcpy( save_username, pw->pw_name );

        return pw;
}

/***************************************************************************
 Make a server_info struct from the info3 returned by a domain logon 
***************************************************************************/

NTSTATUS make_server_info_info3(TALLOC_CTX *mem_ctx, 
                                const char *sent_nt_username,
                                const char *domain,
                                auth_serversupplied_info **server_info, 
                                struct netr_SamInfo3 *info3)
{
        char zeros[16];

        NTSTATUS nt_status = NT_STATUS_OK;
        char *found_username = NULL;
        const char *nt_domain;
        const char *nt_username;
        struct samu *sam_account = NULL;
        DOM_SID user_sid;
        DOM_SID group_sid;
        bool username_was_mapped;

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

        auth_serversupplied_info *result;

        /* 
           Here is where we should check the list of
           trusted domains, and verify that the SID 
           matches.
        */

        sid_copy(&user_sid, info3->base.domain_sid);
        if (!sid_append_rid(&user_sid, info3->base.rid)) {
                return NT_STATUS_INVALID_PARAMETER;
        }
        
        sid_copy(&group_sid, info3->base.domain_sid);
        if (!sid_append_rid(&group_sid, info3->base.primary_gid)) {
                return NT_STATUS_INVALID_PARAMETER;
        }

        nt_username = talloc_strdup(mem_ctx, info3->base.account_name.string);
        if (!nt_username) {
                /* If the server didn't give us one, just use the one we sent
                 * them */
                nt_username = sent_nt_username;
        }

        nt_domain = talloc_strdup(mem_ctx, info3->base.domain.string);
        if (!nt_domain) {
                /* If the server didn't give us one, just use the one we sent
                 * them */
                nt_domain = domain;
        }
        
        /* try to fill the SAM account..  If getpwnam() fails, then try the 
           add user script (2.2.x behavior).

           We use the _unmapped_ username here in an attempt to provide
           consistent username mapping behavior between kerberos and NTLM[SSP]
           authentication in domain mode security.  I.E. Username mapping
           should be applied to the fully qualified username
           (e.g. DOMAIN\user) and not just the login name.  Yes this means we
           called map_username() unnecessarily in make_user_info_map() but
           that is how the current code is designed.  Making the change here
           is the least disruptive place.  -- jerry */
           
        if ( !(sam_account = samu_new( NULL )) ) {
                return NT_STATUS_NO_MEMORY;
        }

        /* this call will try to create the user if necessary */

        nt_status = fill_sam_account(mem_ctx, nt_domain, sent_nt_username,
                                     &found_username, &uid, &gid, sam_account,
                                     &username_was_mapped);

        
        /* if we still don't have a valid unix account check for 
          'map to guest = bad uid' */
          
        if (!NT_STATUS_IS_OK(nt_status)) {
                TALLOC_FREE( sam_account );
                if ( lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_UID ) {
                        make_server_info_guest(NULL, server_info);
                        return NT_STATUS_OK;
                }
                return nt_status;
        }
                
        if (!pdb_set_nt_username(sam_account, nt_username, PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_username(sam_account, nt_username, PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_domain(sam_account, nt_domain, PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_user_sid(sam_account, &user_sid, PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_UNSUCCESSFUL;
        }

        if (!pdb_set_group_sid(sam_account, &group_sid, PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_UNSUCCESSFUL;
        }

        if (!pdb_set_fullname(sam_account,
                              info3->base.full_name.string,
                              PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_logon_script(sam_account,
                                  info3->base.logon_script.string,
                                  PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_profile_path(sam_account,
                                  info3->base.profile_path.string,
                                  PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_homedir(sam_account,
                             info3->base.home_directory.string,
                             PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_dir_drive(sam_account,
                               info3->base.home_drive.string,
                               PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_acct_ctrl(sam_account, info3->base.acct_flags, PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_pass_last_set_time(
                    sam_account,
                    nt_time_to_unix(info3->base.last_password_change),
                    PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_pass_can_change_time(
                    sam_account,
                    nt_time_to_unix(info3->base.allow_password_change),
                    PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_pass_must_change_time(
                    sam_account,
                    nt_time_to_unix(info3->base.force_password_change),
                    PDB_CHANGED)) {
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        result = make_server_info(NULL);
        if (result == NULL) {
                DEBUG(4, ("make_server_info failed!\n"));
                TALLOC_FREE(sam_account);
                return NT_STATUS_NO_MEMORY;
        }

        /* save this here to _net_sam_logon() doesn't fail (it assumes a 
           valid struct samu) */
                   
        result->sam_account = sam_account;
        result->unix_name = talloc_strdup(result, found_username);

        result->sanitized_username = sanitize_username(result,
                                                       result->unix_name);
        if (result->sanitized_username == NULL) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        /* Fill in the unix info we found on the way */

        result->utok.uid = uid;
        result->utok.gid = gid;

        /* Create a 'combined' list of all SIDs we might want in the SD */

        result->num_sids = 0;
        result->sids = NULL;

        nt_status = sid_array_from_info3(result, info3,
                                         &result->sids,
                                         &result->num_sids,
                                         false, false);
        if (!NT_STATUS_IS_OK(nt_status)) {
                TALLOC_FREE(result);
                return nt_status;
        }

        /* Ensure the primary group sid is at position 0. */
        sort_sid_array_for_smbd(result, &group_sid);

        result->login_server = talloc_strdup(result,
                                             info3->base.logon_server.string);

        /* ensure we are never given NULL session keys */

        ZERO_STRUCT(zeros);

        if (memcmp(info3->base.key.key, zeros, sizeof(zeros)) == 0) {
                result->user_session_key = data_blob_null;
        } else {
                result->user_session_key = data_blob_talloc(
                        result, info3->base.key.key,
                        sizeof(info3->base.key.key));
        }

        if (memcmp(info3->base.LMSessKey.key, zeros, 8) == 0) {
                result->lm_session_key = data_blob_null;
        } else {
                result->lm_session_key = data_blob_talloc(
                        result, info3->base.LMSessKey.key,
                        sizeof(info3->base.LMSessKey.key));
        }

        result->nss_token |= username_was_mapped;

        *server_info = result;

        return NT_STATUS_OK;
}

/*****************************************************************************
 Make a server_info struct from the wbcAuthUserInfo returned by a domain logon
******************************************************************************/

NTSTATUS make_server_info_wbcAuthUserInfo(TALLOC_CTX *mem_ctx,
                                          const char *sent_nt_username,
                                          const char *domain,
                                          const struct wbcAuthUserInfo *info,
                                          auth_serversupplied_info **server_info)
{
        char zeros[16];

        NTSTATUS nt_status = NT_STATUS_OK;
        char *found_username = NULL;
        const char *nt_domain;
        const char *nt_username;
        struct samu *sam_account = NULL;
        DOM_SID user_sid;
        DOM_SID group_sid;
        bool username_was_mapped;
        uint32_t i;

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

        auth_serversupplied_info *result;

        result = make_server_info(NULL);
        if (result == NULL) {
                DEBUG(4, ("make_server_info failed!\n"));
                return NT_STATUS_NO_MEMORY;
        }

        /*
           Here is where we should check the list of
           trusted domains, and verify that the SID
           matches.
        */

        memcpy(&user_sid, &info->sids[0].sid, sizeof(user_sid));
        memcpy(&group_sid, &info->sids[1].sid, sizeof(group_sid));

        if (info->account_name) {
                nt_username = talloc_strdup(result, info->account_name);
        } else {
                /* If the server didn't give us one, just use the one we sent
                 * them */
                nt_username = talloc_strdup(result, sent_nt_username);
        }
        if (!nt_username) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (info->domain_name) {
                nt_domain = talloc_strdup(result, info->domain_name);
        } else {
                /* If the server didn't give us one, just use the one we sent
                 * them */
                nt_domain = talloc_strdup(result, domain);
        }
        if (!nt_domain) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        /* try to fill the SAM account..  If getpwnam() fails, then try the
           add user script (2.2.x behavior).

           We use the _unmapped_ username here in an attempt to provide
           consistent username mapping behavior between kerberos and NTLM[SSP]
           authentication in domain mode security.  I.E. Username mapping
           should be applied to the fully qualified username
           (e.g. DOMAIN\user) and not just the login name.  Yes this means we
           called map_username() unnecessarily in make_user_info_map() but
           that is how the current code is designed.  Making the change here
           is the least disruptive place.  -- jerry */

        if ( !(sam_account = samu_new( result )) ) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        /* this call will try to create the user if necessary */

        nt_status = fill_sam_account(result, nt_domain, sent_nt_username,
                                     &found_username, &uid, &gid, sam_account,
                                     &username_was_mapped);

        /* if we still don't have a valid unix account check for
          'map to guest = bad uid' */

        if (!NT_STATUS_IS_OK(nt_status)) {
                TALLOC_FREE( result );
                if ( lp_map_to_guest() == MAP_TO_GUEST_ON_BAD_UID ) {
                        make_server_info_guest(NULL, server_info);
                        return NT_STATUS_OK;
                }
                return nt_status;
        }

        if (!pdb_set_nt_username(sam_account, nt_username, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_username(sam_account, nt_username, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_domain(sam_account, nt_domain, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_user_sid(sam_account, &user_sid, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_UNSUCCESSFUL;
        }

        if (!pdb_set_group_sid(sam_account, &group_sid, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_UNSUCCESSFUL;
        }

        if (!pdb_set_fullname(sam_account, info->full_name, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_logon_script(sam_account, info->logon_script, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_profile_path(sam_account, info->profile_path, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_homedir(sam_account, info->home_directory, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_dir_drive(sam_account, info->home_drive, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_acct_ctrl(sam_account, info->acct_flags, PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_pass_last_set_time(
                    sam_account,
                    nt_time_to_unix(info->pass_last_set_time),
                    PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_pass_can_change_time(
                    sam_account,
                    nt_time_to_unix(info->pass_can_change_time),
                    PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        if (!pdb_set_pass_must_change_time(
                    sam_account,
                    nt_time_to_unix(info->pass_must_change_time),
                    PDB_CHANGED)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        /* save this here to _net_sam_logon() doesn't fail (it assumes a
           valid struct samu) */

        result->sam_account = sam_account;
        result->unix_name = talloc_strdup(result, found_username);

        result->sanitized_username = sanitize_username(result,
                                                       result->unix_name);
        result->login_server = talloc_strdup(result, info->logon_server);

        if ((result->unix_name == NULL)
            || (result->sanitized_username == NULL)
            || (result->login_server == NULL)) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        /* Fill in the unix info we found on the way */

        result->utok.uid = uid;
        result->utok.gid = gid;

        /* Create a 'combined' list of all SIDs we might want in the SD */

        result->num_sids = info->num_sids - 2;
        result->sids = talloc_array(result, DOM_SID, result->num_sids);
        if (result->sids == NULL) {
                TALLOC_FREE(result);
                return NT_STATUS_NO_MEMORY;
        }

        for (i=0; i < result->num_sids; i++) {
                memcpy(&result->sids[i], &info->sids[i+2].sid, sizeof(result->sids[i]));
        }

        /* Ensure the primary group sid is at position 0. */
        sort_sid_array_for_smbd(result, &group_sid);

        /* ensure we are never given NULL session keys */

        ZERO_STRUCT(zeros);

        if (memcmp(info->user_session_key, zeros, sizeof(zeros)) == 0) {
                result->user_session_key = data_blob_null;
        } else {
                result->user_session_key = data_blob_talloc(
                        result, info->user_session_key,
                        sizeof(info->user_session_key));
        }

        if (memcmp(info->lm_session_key, zeros, 8) == 0) {
                result->lm_session_key = data_blob_null;
        } else {
                result->lm_session_key = data_blob_talloc(
                        result, info->lm_session_key,
                        sizeof(info->lm_session_key));
        }

        result->nss_token |= username_was_mapped;

        *server_info = result;

        return NT_STATUS_OK;
}

/***************************************************************************
 Free a user_info struct
***************************************************************************/

void free_user_info(auth_usersupplied_info **user_info)
{
        DEBUG(5,("attempting to free (and zero) a user_info structure\n"));
        if (*user_info != NULL) {
                if ((*user_info)->smb_name) {
                        DEBUG(10,("structure was created for %s\n",
                                  (*user_info)->smb_name));
                }
                SAFE_FREE((*user_info)->smb_name);
                SAFE_FREE((*user_info)->internal_username);
                SAFE_FREE((*user_info)->client_domain);
                SAFE_FREE((*user_info)->domain);
                SAFE_FREE((*user_info)->wksta_name);
                data_blob_free(&(*user_info)->lm_resp);
                data_blob_free(&(*user_info)->nt_resp);
                data_blob_clear_free(&(*user_info)->lm_interactive_pwd);
                data_blob_clear_free(&(*user_info)->nt_interactive_pwd);
                data_blob_clear_free(&(*user_info)->plaintext_password);
                ZERO_STRUCT(**user_info);
        }
        SAFE_FREE(*user_info);
}

/***************************************************************************
 Make an auth_methods struct
***************************************************************************/

bool make_auth_methods(struct auth_context *auth_context, auth_methods **auth_method) 
{
        if (!auth_context) {
                smb_panic("no auth_context supplied to "
                          "make_auth_methods()!\n");
        }

        if (!auth_method) {
                smb_panic("make_auth_methods: pointer to auth_method pointer "
                          "is NULL!\n");
        }

        *auth_method = TALLOC_P(auth_context->mem_ctx, auth_methods);
        if (!*auth_method) {
                DEBUG(0,("make_auth_method: malloc failed!\n"));
                return False;
        }
        ZERO_STRUCTP(*auth_method);
        
        return True;
}

/**
 * Verify whether or not given domain is trusted.
 *
 * @param domain_name name of the domain to be verified
 * @return true if domain is one of the trusted once or
 *         false if otherwise
 **/

bool is_trusted_domain(const char* dom_name)
{
        DOM_SID trustdom_sid;
        bool ret;

        /* no trusted domains for a standalone server */

        if ( lp_server_role() == ROLE_STANDALONE )
                return False;

        /* if we are a DC, then check for a direct trust relationships */

        if ( IS_DC ) {
                become_root();
                DEBUG (5,("is_trusted_domain: Checking for domain trust with "
                          "[%s]\n", dom_name ));
                ret = pdb_get_trusteddom_pw(dom_name, NULL, NULL, NULL);
                unbecome_root();
                if (ret)
                        return True;
        }
        else {
                wbcErr result;

                /* If winbind is around, ask it */

                result = wb_is_trusted_domain(dom_name);

                if (result == WBC_ERR_SUCCESS) {
                        return True;
                }

                if (result == WBC_ERR_DOMAIN_NOT_FOUND) {
                        /* winbind could not find the domain */
                        return False;
                }

                /* The only other possible result is that winbind is not up
                   and running. We need to update the trustdom_cache
                   ourselves */
                
                update_trustdom_cache();
        }

        /* now the trustdom cache should be available a DC could still
         * have a transitive trust so fall back to the cache of trusted
         * domains (like a domain member would use  */

        if ( trustdom_cache_fetch(dom_name, &trustdom_sid) ) {
                return True;
        }

        return False;
}