source: branches/samba-3.5.x/source3/passdb/secrets.c

/*
   Unix SMB/CIFS implementation.
   Copyright (C) Andrew Tridgell 1992-2001
   Copyright (C) Andrew Bartlett      2002
   Copyright (C) Rafal Szczesniak     2002
   Copyright (C) Tim Potter           2001

   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/>.
*/

/* the Samba secrets database stores any generated, private information
   such as the local SID and machine trust password */

#include "includes.h"
#include "../libcli/auth/libcli_auth.h"
#include "librpc/gen_ndr/ndr_secrets.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_PASSDB

static struct db_context *db_ctx;

/* Urrrg. global.... */
bool global_machine_password_needs_changing;

/**
 * Use a TDB to store an incrementing random seed.
 *
 * Initialised to the current pid, the very first time Samba starts,
 * and incremented by one each time it is needed.
 *
 * @note Not called by systems with a working /dev/urandom.
 */
static void get_rand_seed(void *userdata, int *new_seed)
{
        *new_seed = sys_getpid();
        if (db_ctx) {
                dbwrap_trans_change_int32_atomic(db_ctx, "INFO/random_seed",
                                                 new_seed, 1);
        }
}

/* open up the secrets database */
bool secrets_init(void)
{
        char *fname = NULL;
        unsigned char dummy;

        if (db_ctx != NULL)
                return True;

        fname = talloc_asprintf(talloc_tos(), "%s/secrets.tdb",
                                lp_private_dir());
        if (fname == NULL) {
                return false;
        }

        db_ctx = db_open(NULL, fname, 0,
                         TDB_DEFAULT, O_RDWR|O_CREAT, 0600);

        if (db_ctx == NULL) {
                DEBUG(0,("Failed to open %s\n", fname));
                TALLOC_FREE(fname);
                return False;
        }

        TALLOC_FREE(fname);

        /**
         * Set a reseed function for the crypto random generator
         *
         * This avoids a problem where systems without /dev/urandom
         * could send the same challenge to multiple clients
         */
        set_rand_reseed_callback(get_rand_seed, NULL);

        /* Ensure that the reseed is done now, while we are root, etc */
        generate_random_buffer(&dummy, sizeof(dummy));

        return True;
}

struct db_context *secrets_db_ctx(void)
{
        if (!secrets_init()) {
                return NULL;
        }

        return db_ctx;
}

/*
 * close secrets.tdb
 */
void secrets_shutdown(void)
{
        TALLOC_FREE(db_ctx);
}

/* read a entry from the secrets database - the caller must free the result
   if size is non-null then the size of the entry is put in there
 */
void *secrets_fetch(const char *key, size_t *size)
{
        TDB_DATA dbuf;
        void *result;

        if (!secrets_init()) {
                return NULL;
        }

        if (db_ctx->fetch(db_ctx, talloc_tos(), string_tdb_data(key),
                          &dbuf) != 0) {
                return NULL;
        }

        result = memdup(dbuf.dptr, dbuf.dsize);
        if (result == NULL) {
                return NULL;
        }
        TALLOC_FREE(dbuf.dptr);

        if (size) {
                *size = dbuf.dsize;
        }

        return result;
}

/* store a secrets entry
 */
bool secrets_store(const char *key, const void *data, size_t size)
{
        NTSTATUS status;

        if (!secrets_init()) {
                return false;
        }

        status = dbwrap_trans_store(db_ctx, string_tdb_data(key),
                                    make_tdb_data((const uint8 *)data, size),
                                    TDB_REPLACE);
        return NT_STATUS_IS_OK(status);
}


/* delete a secets database entry
 */
bool secrets_delete(const char *key)
{
        NTSTATUS status;
        if (!secrets_init()) {
                return false;
        }

        status = dbwrap_trans_delete(db_ctx, string_tdb_data(key));

        return NT_STATUS_IS_OK(status);
}

/**
 * Form a key for fetching the domain sid
 *
 * @param domain domain name
 *
 * @return keystring
 **/
static const char *domain_sid_keystr(const char *domain)
{
        char *keystr;

        keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
                                            SECRETS_DOMAIN_SID, domain);
        SMB_ASSERT(keystr != NULL);
        return keystr;
}

bool secrets_store_domain_sid(const char *domain, const DOM_SID *sid)
{
        bool ret;

        ret = secrets_store(domain_sid_keystr(domain), sid, sizeof(DOM_SID));

        /* Force a re-query, in case we modified our domain */
        if (ret)
                reset_global_sam_sid();
        return ret;
}

bool secrets_fetch_domain_sid(const char *domain, DOM_SID *sid)
{
        DOM_SID *dyn_sid;
        size_t size = 0;

        dyn_sid = (DOM_SID *)secrets_fetch(domain_sid_keystr(domain), &size);

        if (dyn_sid == NULL)
                return False;

        if (size != sizeof(DOM_SID)) {
                SAFE_FREE(dyn_sid);
                return False;
        }

        *sid = *dyn_sid;
        SAFE_FREE(dyn_sid);
        return True;
}

bool secrets_store_domain_guid(const char *domain, struct GUID *guid)
{
        fstring key;

        slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_DOMAIN_GUID, domain);
        strupper_m(key);
        return secrets_store(key, guid, sizeof(struct GUID));
}

bool secrets_fetch_domain_guid(const char *domain, struct GUID *guid)
{
        struct GUID *dyn_guid;
        fstring key;
        size_t size = 0;
        struct GUID new_guid;

        slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_DOMAIN_GUID, domain);
        strupper_m(key);
        dyn_guid = (struct GUID *)secrets_fetch(key, &size);

        if (!dyn_guid) {
                if (lp_server_role() == ROLE_DOMAIN_PDC) {
                        new_guid = GUID_random();
                        if (!secrets_store_domain_guid(domain, &new_guid))
                                return False;
                        dyn_guid = (struct GUID *)secrets_fetch(key, &size);
                }
                if (dyn_guid == NULL) {
                        return False;
                }
        }

        if (size != sizeof(struct GUID)) {
                DEBUG(1,("UUID size %d is wrong!\n", (int)size));
                SAFE_FREE(dyn_guid);
                return False;
        }

        *guid = *dyn_guid;
        SAFE_FREE(dyn_guid);
        return True;
}

bool secrets_store_local_schannel_key(uint8_t schannel_key[16])
{
        return secrets_store(SECRETS_LOCAL_SCHANNEL_KEY, schannel_key, 16);
}

bool secrets_fetch_local_schannel_key(uint8_t schannel_key[16])
{
        size_t size = 0;
        uint8_t *key;

        key = (uint8_t *)secrets_fetch(SECRETS_LOCAL_SCHANNEL_KEY, &size);
        if (key == NULL) {
                return false;
        }

        if (size != 16) {
                SAFE_FREE(key);
                return false;
        }

        memcpy(schannel_key, key, 16);
        SAFE_FREE(key);
        return true;
}

/**
 * Form a key for fetching the machine trust account sec channel type
 *
 * @param domain domain name
 *
 * @return keystring
 **/
static const char *machine_sec_channel_type_keystr(const char *domain)
{
        char *keystr;

        keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
                                            SECRETS_MACHINE_SEC_CHANNEL_TYPE,
                                            domain);
        SMB_ASSERT(keystr != NULL);
        return keystr;
}

/**
 * Form a key for fetching the machine trust account last change time
 *
 * @param domain domain name
 *
 * @return keystring
 **/
static const char *machine_last_change_time_keystr(const char *domain)
{
        char *keystr;

        keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
                                            SECRETS_MACHINE_LAST_CHANGE_TIME,
                                            domain);
        SMB_ASSERT(keystr != NULL);
        return keystr;
}


/**
 * Form a key for fetching the machine previous trust account password
 *
 * @param domain domain name
 *
 * @return keystring
 **/
static const char *machine_prev_password_keystr(const char *domain)
{
        char *keystr;

        keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
                                            SECRETS_MACHINE_PASSWORD_PREV, domain);
        SMB_ASSERT(keystr != NULL);
        return keystr;
}

/**
 * Form a key for fetching the machine trust account password
 *
 * @param domain domain name
 *
 * @return keystring
 **/
static const char *machine_password_keystr(const char *domain)
{
        char *keystr;

        keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
                                            SECRETS_MACHINE_PASSWORD, domain);
        SMB_ASSERT(keystr != NULL);
        return keystr;
}

/**
 * Form a key for fetching the machine trust account password
 *
 * @param domain domain name
 *
 * @return stored password's key
 **/
static const char *trust_keystr(const char *domain)
{
        char *keystr;

        keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
                                            SECRETS_MACHINE_ACCT_PASS, domain);
        SMB_ASSERT(keystr != NULL);
        return keystr;
}

/**
 * Form a key for fetching a trusted domain password
 *
 * @param domain trusted domain name
 *
 * @return stored password's key
 **/
static char *trustdom_keystr(const char *domain)
{
        char *keystr;

        keystr = talloc_asprintf_strupper_m(talloc_tos(), "%s/%s",
                                            SECRETS_DOMTRUST_ACCT_PASS,
                                            domain);
        SMB_ASSERT(keystr != NULL);
        return keystr;
}

/************************************************************************
 Lock the trust password entry.
************************************************************************/

void *secrets_get_trust_account_lock(TALLOC_CTX *mem_ctx, const char *domain)
{
        if (!secrets_init()) {
                return NULL;
        }

        return db_ctx->fetch_locked(
                db_ctx, mem_ctx, string_term_tdb_data(trust_keystr(domain)));
}

/************************************************************************
 Routine to get the default secure channel type for trust accounts
************************************************************************/

enum netr_SchannelType get_default_sec_channel(void)
{
        if (lp_server_role() == ROLE_DOMAIN_BDC ||
            lp_server_role() == ROLE_DOMAIN_PDC) {
                return SEC_CHAN_BDC;
        } else {
                return SEC_CHAN_WKSTA;
        }
}

/************************************************************************
 Routine to get the trust account password for a domain.
 This only tries to get the legacy hashed version of the password.
 The user of this function must have locked the trust password file using
 the above secrets_lock_trust_account_password().
************************************************************************/

bool secrets_fetch_trust_account_password_legacy(const char *domain,
                                                 uint8 ret_pwd[16],
                                                 time_t *pass_last_set_time,
                                                 enum netr_SchannelType *channel)
{
        struct machine_acct_pass *pass;
        size_t size = 0;

        if (!(pass = (struct machine_acct_pass *)secrets_fetch(
                      trust_keystr(domain), &size))) {
                DEBUG(5, ("secrets_fetch failed!\n"));
                return False;
        }

        if (size != sizeof(*pass)) {
                DEBUG(0, ("secrets were of incorrect size!\n"));
                SAFE_FREE(pass);
                return False;
        }

        if (pass_last_set_time) {
                *pass_last_set_time = pass->mod_time;
        }
        memcpy(ret_pwd, pass->hash, 16);

        if (channel) {
                *channel = get_default_sec_channel();
        }

        /* Test if machine password has expired and needs to be changed */
        if (lp_machine_password_timeout()) {
                if (pass->mod_time > 0 && time(NULL) > (pass->mod_time +
                                (time_t)lp_machine_password_timeout())) {
                        global_machine_password_needs_changing = True;
                }
        }

        SAFE_FREE(pass);
        return True;
}

/************************************************************************
 Routine to get the trust account password for a domain.
 The user of this function must have locked the trust password file using
 the above secrets_lock_trust_account_password().
************************************************************************/

bool secrets_fetch_trust_account_password(const char *domain, uint8 ret_pwd[16],
                                          time_t *pass_last_set_time,
                                          enum netr_SchannelType *channel)
{
        char *plaintext;

        plaintext = secrets_fetch_machine_password(domain, pass_last_set_time,
                                                   channel);
        if (plaintext) {
                DEBUG(4,("Using cleartext machine password\n"));
                E_md4hash(plaintext, ret_pwd);
                SAFE_FREE(plaintext);
                return True;
        }

        return secrets_fetch_trust_account_password_legacy(domain, ret_pwd,
                                                           pass_last_set_time,
                                                           channel);
}

/************************************************************************
 Routine to get account password to trusted domain
************************************************************************/

bool secrets_fetch_trusted_domain_password(const char *domain, char** pwd,
                                           DOM_SID *sid, time_t *pass_last_set_time)
{
        struct TRUSTED_DOM_PASS pass;
        enum ndr_err_code ndr_err;

        /* unpacking structures */
        DATA_BLOB blob;

        /* fetching trusted domain password structure */
        if (!(blob.data = (uint8_t *)secrets_fetch(trustdom_keystr(domain),
                                                   &blob.length))) {
                DEBUG(5, ("secrets_fetch failed!\n"));
                return False;
        }

        /* unpack trusted domain password */
        ndr_err = ndr_pull_struct_blob(&blob, talloc_tos(), NULL, &pass,
                        (ndr_pull_flags_fn_t)ndr_pull_TRUSTED_DOM_PASS);
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
                return false;
        }

        SAFE_FREE(blob.data);

        /* the trust's password */
        if (pwd) {
                *pwd = SMB_STRDUP(pass.pass);
                if (!*pwd) {
                        return False;
                }
        }

        /* last change time */
        if (pass_last_set_time) *pass_last_set_time = pass.mod_time;

        /* domain sid */
        if (sid != NULL) sid_copy(sid, &pass.domain_sid);

        return True;
}

/**
 * Routine to store the password for trusted domain
 *
 * @param domain remote domain name
 * @param pwd plain text password of trust relationship
 * @param sid remote domain sid
 *
 * @return true if succeeded
 **/

bool secrets_store_trusted_domain_password(const char* domain, const char* pwd,
                                           const DOM_SID *sid)
{
        bool ret;

        /* packing structures */
        DATA_BLOB blob;
        enum ndr_err_code ndr_err;
        struct TRUSTED_DOM_PASS pass;
        ZERO_STRUCT(pass);

        pass.uni_name = domain;
        pass.uni_name_len = strlen(domain)+1;

        /* last change time */
        pass.mod_time = time(NULL);

        /* password of the trust */
        pass.pass_len = strlen(pwd);
        pass.pass = pwd;

        /* domain sid */
        sid_copy(&pass.domain_sid, sid);

        ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), NULL, &pass,
                        (ndr_push_flags_fn_t)ndr_push_TRUSTED_DOM_PASS);
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
                return false;
        }

        ret = secrets_store(trustdom_keystr(domain), blob.data, blob.length);

        data_blob_free(&blob);

        return ret;
}

/************************************************************************
 Routine to delete the old plaintext machine account password if any
************************************************************************/

static bool secrets_delete_prev_machine_password(const char *domain)
{
        char *oldpass = (char *)secrets_fetch(machine_prev_password_keystr(domain), NULL);
        if (oldpass == NULL) {
                return true;
        }
        SAFE_FREE(oldpass);
        return secrets_delete(machine_prev_password_keystr(domain));
}

/************************************************************************
 Routine to delete the plaintext machine account password and old
 password if any
************************************************************************/

bool secrets_delete_machine_password(const char *domain)
{
        if (!secrets_delete_prev_machine_password(domain)) {
                return false;
        }
        return secrets_delete(machine_password_keystr(domain));
}

/************************************************************************
 Routine to delete the plaintext machine account password, old password,
 sec channel type and last change time from secrets database
************************************************************************/

bool secrets_delete_machine_password_ex(const char *domain)
{
        if (!secrets_delete_prev_machine_password(domain)) {
                return false;
        }
        if (!secrets_delete(machine_password_keystr(domain))) {
                return false;
        }
        if (!secrets_delete(machine_sec_channel_type_keystr(domain))) {
                return false;
        }
        return secrets_delete(machine_last_change_time_keystr(domain));
}

/************************************************************************
 Routine to delete the domain sid
************************************************************************/

bool secrets_delete_domain_sid(const char *domain)
{
        return secrets_delete(domain_sid_keystr(domain));
}

/************************************************************************
 Routine to store the previous machine password (by storing the current password
 as the old)
************************************************************************/

static bool secrets_store_prev_machine_password(const char *domain)
{
        char *oldpass;
        bool ret;

        oldpass = (char *)secrets_fetch(machine_password_keystr(domain), NULL);
        if (oldpass == NULL) {
                return true;
        }
        ret = secrets_store(machine_prev_password_keystr(domain), oldpass, strlen(oldpass)+1);
        SAFE_FREE(oldpass);
        return ret;
}

/************************************************************************
 Routine to set the plaintext machine account password for a realm
 the password is assumed to be a null terminated ascii string.
 Before storing
************************************************************************/

bool secrets_store_machine_password(const char *pass, const char *domain,
                                    enum netr_SchannelType sec_channel)
{
        bool ret;
        uint32 last_change_time;
        uint32 sec_channel_type;

        if (!secrets_store_prev_machine_password(domain)) {
                return false;
        }

        ret = secrets_store(machine_password_keystr(domain), pass, strlen(pass)+1);
        if (!ret)
                return ret;

        SIVAL(&last_change_time, 0, time(NULL));
        ret = secrets_store(machine_last_change_time_keystr(domain), &last_change_time, sizeof(last_change_time));

        SIVAL(&sec_channel_type, 0, sec_channel);
        ret = secrets_store(machine_sec_channel_type_keystr(domain), &sec_channel_type, sizeof(sec_channel_type));

        return ret;
}


/************************************************************************
 Routine to fetch the previous plaintext machine account password for a realm
 the password is assumed to be a null terminated ascii string.
************************************************************************/

char *secrets_fetch_prev_machine_password(const char *domain)
{
        return (char *)secrets_fetch(machine_prev_password_keystr(domain), NULL);
}

/************************************************************************
 Routine to fetch the plaintext machine account password for a realm
 the password is assumed to be a null terminated ascii string.
************************************************************************/

char *secrets_fetch_machine_password(const char *domain,
                                     time_t *pass_last_set_time,
                                     enum netr_SchannelType *channel)
{
        char *ret;
        ret = (char *)secrets_fetch(machine_password_keystr(domain), NULL);

        if (pass_last_set_time) {
                size_t size;
                uint32 *last_set_time;
                last_set_time = (unsigned int *)secrets_fetch(machine_last_change_time_keystr(domain), &size);
                if (last_set_time) {
                        *pass_last_set_time = IVAL(last_set_time,0);
                        SAFE_FREE(last_set_time);
                } else {
                        *pass_last_set_time = 0;
                }
        }

        if (channel) {
                size_t size;
                uint32 *channel_type;
                channel_type = (unsigned int *)secrets_fetch(machine_sec_channel_type_keystr(domain), &size);
                if (channel_type) {
                        *channel = IVAL(channel_type,0);
                        SAFE_FREE(channel_type);
                } else {
                        *channel = get_default_sec_channel();
                }
        }

        return ret;
}

/************************************************************************
 Routine to delete the password for trusted domain
************************************************************************/

bool trusted_domain_password_delete(const char *domain)
{
        return secrets_delete(trustdom_keystr(domain));
}

bool secrets_store_ldap_pw(const char* dn, char* pw)
{
        char *key = NULL;
        bool ret;

        if (asprintf(&key, "%s/%s", SECRETS_LDAP_BIND_PW, dn) < 0) {
                DEBUG(0, ("secrets_store_ldap_pw: asprintf failed!\n"));
                return False;
        }

        ret = secrets_store(key, pw, strlen(pw)+1);

        SAFE_FREE(key);
        return ret;
}

/*******************************************************************
 Find the ldap password.
******************************************************************/

bool fetch_ldap_pw(char **dn, char** pw)
{
        char *key = NULL;
        size_t size = 0;

        *dn = smb_xstrdup(lp_ldap_admin_dn());

        if (asprintf(&key, "%s/%s", SECRETS_LDAP_BIND_PW, *dn) < 0) {
                SAFE_FREE(*dn);
                DEBUG(0, ("fetch_ldap_pw: asprintf failed!\n"));
                return false;
        }

        *pw=(char *)secrets_fetch(key, &size);
        SAFE_FREE(key);

        if (!size) {
                /* Upgrade 2.2 style entry */
                char *p;
                char* old_style_key = SMB_STRDUP(*dn);
                char *data;
                fstring old_style_pw;

                if (!old_style_key) {
                        DEBUG(0, ("fetch_ldap_pw: strdup failed!\n"));
                        return False;
                }

                for (p=old_style_key; *p; p++)
                        if (*p == ',') *p = '/';

                data=(char *)secrets_fetch(old_style_key, &size);
                if ((data == NULL) || (size < sizeof(old_style_pw))) {
                        DEBUG(0,("fetch_ldap_pw: neither ldap secret retrieved!\n"));
                        SAFE_FREE(old_style_key);
                        SAFE_FREE(*dn);
                        SAFE_FREE(data);
                        return False;
                }

                size = MIN(size, sizeof(fstring)-1);
                strncpy(old_style_pw, data, size);
                old_style_pw[size] = 0;

                SAFE_FREE(data);

                if (!secrets_store_ldap_pw(*dn, old_style_pw)) {
                        DEBUG(0,("fetch_ldap_pw: ldap secret could not be upgraded!\n"));
                        SAFE_FREE(old_style_key);
                        SAFE_FREE(*dn);
                        return False;
                }
                if (!secrets_delete(old_style_key)) {
                        DEBUG(0,("fetch_ldap_pw: old ldap secret could not be deleted!\n"));
                }

                SAFE_FREE(old_style_key);

                *pw = smb_xstrdup(old_style_pw);
        }

        return True;
}

/**
 * Get trusted domains info from secrets.tdb.
 **/

struct list_trusted_domains_state {
        uint32 num_domains;
        struct trustdom_info **domains;
};

static int list_trusted_domain(struct db_record *rec, void *private_data)
{
        const size_t prefix_len = strlen(SECRETS_DOMTRUST_ACCT_PASS);
        struct TRUSTED_DOM_PASS pass;
        enum ndr_err_code ndr_err;
        DATA_BLOB blob;
        struct trustdom_info *dom_info;

        struct list_trusted_domains_state *state =
                (struct list_trusted_domains_state *)private_data;

        if ((rec->key.dsize < prefix_len)
            || (strncmp((char *)rec->key.dptr, SECRETS_DOMTRUST_ACCT_PASS,
                        prefix_len) != 0)) {
                return 0;
        }

        blob = data_blob_const(rec->value.dptr, rec->value.dsize);

        ndr_err = ndr_pull_struct_blob(&blob, talloc_tos(), NULL, &pass,
                        (ndr_pull_flags_fn_t)ndr_pull_TRUSTED_DOM_PASS);
        if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
                return false;
        }

        if (pass.domain_sid.num_auths != 4) {
                DEBUG(0, ("SID %s is not a domain sid, has %d "
                          "auths instead of 4\n",
                          sid_string_dbg(&pass.domain_sid),
                          pass.domain_sid.num_auths));
                return 0;
        }

        if (!(dom_info = TALLOC_P(state->domains, struct trustdom_info))) {
                DEBUG(0, ("talloc failed\n"));
                return 0;
        }

        dom_info->name = talloc_strdup(dom_info, pass.uni_name);
        if (!dom_info->name) {
                TALLOC_FREE(dom_info);
                return 0;
        }

        sid_copy(&dom_info->sid, &pass.domain_sid);

        ADD_TO_ARRAY(state->domains, struct trustdom_info *, dom_info,
                     &state->domains, &state->num_domains);

        if (state->domains == NULL) {
                state->num_domains = 0;
                return -1;
        }
        return 0;
}

NTSTATUS secrets_trusted_domains(TALLOC_CTX *mem_ctx, uint32 *num_domains,
                                 struct trustdom_info ***domains)
{
        struct list_trusted_domains_state state;

        secrets_init();

        if (db_ctx == NULL) {
                return NT_STATUS_ACCESS_DENIED;
        }

        state.num_domains = 0;

        /*
         * Make sure that a talloc context for the trustdom_info structs
         * exists
         */

        if (!(state.domains = TALLOC_ARRAY(
                      mem_ctx, struct trustdom_info *, 1))) {
                return NT_STATUS_NO_MEMORY;
        }

        db_ctx->traverse_read(db_ctx, list_trusted_domain, (void *)&state);

        *num_domains = state.num_domains;
        *domains = state.domains;
        return NT_STATUS_OK;
}

/*******************************************************************************
 Store a complete AFS keyfile into secrets.tdb.
*******************************************************************************/

bool secrets_store_afs_keyfile(const char *cell, const struct afs_keyfile *keyfile)
{
        fstring key;

        if ((cell == NULL) || (keyfile == NULL))
                return False;

        if (ntohl(keyfile->nkeys) > SECRETS_AFS_MAXKEYS)
                return False;

        slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_AFS_KEYFILE, cell);
        return secrets_store(key, keyfile, sizeof(struct afs_keyfile));
}

/*******************************************************************************
 Fetch the current (highest) AFS key from secrets.tdb
*******************************************************************************/
bool secrets_fetch_afs_key(const char *cell, struct afs_key *result)
{
        fstring key;
        struct afs_keyfile *keyfile;
        size_t size = 0;
        uint32 i;

        slprintf(key, sizeof(key)-1, "%s/%s", SECRETS_AFS_KEYFILE, cell);

        keyfile = (struct afs_keyfile *)secrets_fetch(key, &size);

        if (keyfile == NULL)
                return False;

        if (size != sizeof(struct afs_keyfile)) {
                SAFE_FREE(keyfile);
                return False;
        }

        i = ntohl(keyfile->nkeys);

        if (i > SECRETS_AFS_MAXKEYS) {
                SAFE_FREE(keyfile);
                return False;
        }

        *result = keyfile->entry[i-1];

        result->kvno = ntohl(result->kvno);

        SAFE_FREE(keyfile);

        return True;
}

/******************************************************************************
  When kerberos is not available, choose between anonymous or
  authenticated connections.

  We need to use an authenticated connection if DCs have the
  RestrictAnonymous registry entry set > 0, or the "Additional
  restrictions for anonymous connections" set in the win2k Local
  Security Policy.

  Caller to free() result in domain, username, password
*******************************************************************************/
void secrets_fetch_ipc_userpass(char **username, char **domain, char **password)
{
        *username = (char *)secrets_fetch(SECRETS_AUTH_USER, NULL);
        *domain = (char *)secrets_fetch(SECRETS_AUTH_DOMAIN, NULL);
        *password = (char *)secrets_fetch(SECRETS_AUTH_PASSWORD, NULL);

        if (*username && **username) {

                if (!*domain || !**domain)
                        *domain = smb_xstrdup(lp_workgroup());

                if (!*password || !**password)
                        *password = smb_xstrdup("");

                DEBUG(3, ("IPC$ connections done by user %s\\%s\n",
                          *domain, *username));

        } else {
                DEBUG(3, ("IPC$ connections done anonymously\n"));
                *username = smb_xstrdup("");
                *domain = smb_xstrdup("");
                *password = smb_xstrdup("");
        }
}

bool secrets_store_generic(const char *owner, const char *key, const char *secret)
{
        char *tdbkey = NULL;
        bool ret;

        if (asprintf(&tdbkey, "SECRETS/GENERIC/%s/%s", owner, key) < 0) {
                DEBUG(0, ("asprintf failed!\n"));
                return False;
        }

        ret = secrets_store(tdbkey, secret, strlen(secret)+1);

        SAFE_FREE(tdbkey);
        return ret;
}

bool secrets_delete_generic(const char *owner, const char *key)
{
        char *tdbkey = NULL;
        bool ret;

        if (asprintf(&tdbkey, "SECRETS/GENERIC/%s/%s", owner, key) < 0) {
                DEBUG(0, ("asprintf failed!\n"));
                return False;
        }

        ret = secrets_delete(tdbkey);

        SAFE_FREE(tdbkey);
        return ret;
}

/*******************************************************************
 Find the ldap password.
******************************************************************/

char *secrets_fetch_generic(const char *owner, const char *key)
{
        char *secret = NULL;
        char *tdbkey = NULL;

        if (( ! owner) || ( ! key)) {
                DEBUG(1, ("Invalid Paramters"));
                return NULL;
        }

        if (asprintf(&tdbkey, "SECRETS/GENERIC/%s/%s", owner, key) < 0) {
                DEBUG(0, ("Out of memory!\n"));
                return NULL;
        }

        secret = (char *)secrets_fetch(tdbkey, NULL);
        SAFE_FREE(tdbkey);

        return secret;
}