Remove the use of dirfd inside the vfs_dirsort.c.

[Samba/gebeck_regimport.git] / source3 / winbindd / idmap_tdb_common.c

/*
   Unix SMB/CIFS implementation.

   common functions for TDB based idmapping backends

   Copyright (C) Christian Ambach 2012

   These functions were initially copied over from idmap_tdb.c and idmap_tdb2.c
   which are:

   Copyright (C) Tim Potter 2000
   Copyright (C) Jim McDonough <jmcd@us.ibm.com> 2003
   Copyright (C) Jeremy Allison 2006
   Copyright (C) Simo Sorce 2003-2006
   Copyright (C) Michael Adam 2009-2010
   Copyright (C) Andrew Tridgell 2007

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"
#include "idmap_tdb_common.h"
#include "dbwrap/dbwrap.h"
#include "util_tdb.h"
#include "idmap_rw.h"
#include "../libcli/security/dom_sid.h"

#undef DBGC_CLASS
#define DBGC_CLASS DBGC_IDMAP

struct idmap_tdb_common_allocate_id_context {
        const char *hwmkey;
        const char *hwmtype;
        uint32_t high_hwm;
        uint32_t hwm;
};

static NTSTATUS idmap_tdb_common_allocate_id_action(struct db_context *db,
                                                    void *private_data)
{
        NTSTATUS ret;
        struct idmap_tdb_common_allocate_id_context *state;
        uint32_t hwm;

        state = (struct idmap_tdb_common_allocate_id_context *)private_data;

        ret = dbwrap_fetch_uint32_bystring(db, state->hwmkey, &hwm);
        if (!NT_STATUS_IS_OK(ret)) {
                ret = NT_STATUS_INTERNAL_DB_ERROR;
                goto done;
        }

        /* check it is in the range */
        if (hwm > state->high_hwm) {
                DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
                          state->hwmtype, (unsigned long)state->high_hwm));
                ret = NT_STATUS_UNSUCCESSFUL;
                goto done;
        }

        /* fetch a new id and increment it */
        ret = dbwrap_change_uint32_atomic_bystring(db, state->hwmkey, &hwm, 1);
        if (!NT_STATUS_IS_OK(ret)) {
                DEBUG(1, ("Fatal error while fetching a new %s value\n!",
                          state->hwmtype));
                goto done;
        }

        /* recheck it is in the range */
        if (hwm > state->high_hwm) {
                DEBUG(1, ("Fatal Error: %s range full!! (max: %lu)\n",
                          state->hwmtype, (unsigned long)state->high_hwm));
                ret = NT_STATUS_UNSUCCESSFUL;
                goto done;
        }

        ret = NT_STATUS_OK;
        state->hwm = hwm;

      done:
        return ret;
}

static NTSTATUS idmap_tdb_common_allocate_id(struct idmap_domain *dom,
                                             struct unixid *xid)
{
        const char *hwmkey;
        const char *hwmtype;
        uint32_t hwm = 0;
        NTSTATUS status;
        struct idmap_tdb_common_allocate_id_context state;
        struct idmap_tdb_common_context *ctx;

        ctx =
            talloc_get_type_abort(dom->private_data,
                                  struct idmap_tdb_common_context);

        /* Get current high water mark */
        switch (xid->type) {

        case ID_TYPE_UID:
                hwmkey = ctx->hwmkey_uid;
                hwmtype = "UID";
                break;

        case ID_TYPE_GID:
                hwmkey = ctx->hwmkey_gid;
                hwmtype = "GID";
                break;

        default:
                DEBUG(2, ("Invalid ID type (0x%x)\n", xid->type));
                return NT_STATUS_INVALID_PARAMETER;
        }

        state.hwm = hwm;
        state.high_hwm = ctx->max_id;
        state.hwmtype = hwmtype;
        state.hwmkey = hwmkey;

        status = dbwrap_trans_do(ctx->db, idmap_tdb_common_allocate_id_action,
                                 &state);

        if (NT_STATUS_IS_OK(status)) {
                xid->id = state.hwm;
                DEBUG(10, ("New %s = %d\n", hwmtype, state.hwm));
        } else {
                DEBUG(1, ("Error allocating a new %s\n", hwmtype));
        }

        return status;
}

/**
 * Allocate a new unix-ID.
 * For now this is for the default idmap domain only.
 * Should be extended later on.
 */
NTSTATUS idmap_tdb_common_get_new_id(struct idmap_domain * dom,
                                     struct unixid * id)
{
        NTSTATUS ret;

        if (!strequal(dom->name, "*")) {
                DEBUG(3, ("idmap_tdb_common_get_new_id: "
                          "Refusing allocation of a new unixid for domain'%s'. "
                          "Currently only supported for the default "
                          "domain \"*\".\n", dom->name));
                return NT_STATUS_NOT_IMPLEMENTED;
        }

        ret = idmap_tdb_common_allocate_id(dom, id);

        return ret;
}

/**
 * store a mapping in the database.
 */

struct idmap_tdb_common_set_mapping_context {
        const char *ksidstr;
        const char *kidstr;
};

static NTSTATUS idmap_tdb_common_set_mapping_action(struct db_context *db,
                                                    void *private_data)
{
        TDB_DATA data;
        NTSTATUS ret;
        struct idmap_tdb_common_set_mapping_context *state;
        TALLOC_CTX *tmp_ctx = talloc_stackframe();

        state = (struct idmap_tdb_common_set_mapping_context *)private_data;

        DEBUG(10, ("Storing %s <-> %s map\n", state->ksidstr, state->kidstr));

        /* check whether sid mapping is already present in db */
        ret = dbwrap_fetch_bystring(db, tmp_ctx, state->ksidstr, &data);
        if (NT_STATUS_IS_OK(ret)) {
                ret = NT_STATUS_OBJECT_NAME_COLLISION;
                goto done;
        }

        ret = dbwrap_store_bystring(db, state->ksidstr,
                                    string_term_tdb_data(state->kidstr),
                                    TDB_INSERT);
        if (!NT_STATUS_IS_OK(ret)) {
                DEBUG(0, ("Error storing SID -> ID: %s\n", nt_errstr(ret)));
                goto done;
        }

        ret = dbwrap_store_bystring(db, state->kidstr,
                                    string_term_tdb_data(state->ksidstr),
                                    TDB_INSERT);
        if (!NT_STATUS_IS_OK(ret)) {
                DEBUG(0, ("Error storing ID -> SID: %s\n", nt_errstr(ret)));
                /* try to remove the previous stored SID -> ID map */
                dbwrap_delete_bystring(db, state->ksidstr);
                goto done;
        }

        DEBUG(10, ("Stored %s <-> %s\n", state->ksidstr, state->kidstr));

      done:
        talloc_free(tmp_ctx);
        return ret;
}

NTSTATUS idmap_tdb_common_set_mapping(struct idmap_domain * dom,
                                      const struct id_map * map)
{
        struct idmap_tdb_common_context *ctx;
        struct idmap_tdb_common_set_mapping_context state;
        NTSTATUS ret;
        char *ksidstr, *kidstr;

        if (!map || !map->sid) {
                return NT_STATUS_INVALID_PARAMETER;
        }

        ksidstr = kidstr = NULL;

        /* TODO: should we filter a set_mapping using low/high filters ? */

        ctx =
            talloc_get_type_abort(dom->private_data,
                                  struct idmap_tdb_common_context);

        switch (map->xid.type) {

        case ID_TYPE_UID:
                kidstr =
                    talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
                break;

        case ID_TYPE_GID:
                kidstr =
                    talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
                break;

        default:
                DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
                return NT_STATUS_INVALID_PARAMETER;
        }

        if (kidstr == NULL) {
                DEBUG(0, ("ERROR: Out of memory!\n"));
                ret = NT_STATUS_NO_MEMORY;
                goto done;
        }

        ksidstr = sid_string_talloc(ctx, map->sid);
        if (ksidstr == NULL) {
                DEBUG(0, ("Out of memory!\n"));
                ret = NT_STATUS_NO_MEMORY;
                goto done;
        }

        state.ksidstr = ksidstr;
        state.kidstr = kidstr;

        ret = dbwrap_trans_do(ctx->db, idmap_tdb_common_set_mapping_action,
                              &state);

      done:
        talloc_free(ksidstr);
        talloc_free(kidstr);
        return ret;
}

/*
 * Create a new mapping for an unmapped SID, also allocating a new ID.
 * This should be run inside a transaction.
 *
 * TODO:
 *  Properly integrate this with multi domain idmap config:
 *  Currently, the allocator is default-config only.
 */
NTSTATUS idmap_tdb_common_new_mapping(struct idmap_domain * dom,
                                      struct id_map * map)
{
        NTSTATUS ret;
        struct idmap_tdb_common_context *ctx;

        ctx =
            talloc_get_type_abort(dom->private_data,
                                  struct idmap_tdb_common_context);

        ret = idmap_rw_new_mapping(dom, ctx->rw_ops, map);

        return ret;
}

/*
  lookup a set of unix ids
*/
NTSTATUS idmap_tdb_common_unixids_to_sids(struct idmap_domain * dom,
                                          struct id_map ** ids)
{
        NTSTATUS ret;
        int i, num_mapped = 0;
        struct idmap_tdb_common_context *ctx;

        NTSTATUS(*unixid_to_sid_fn) (struct idmap_domain * dom,
                                     struct id_map * map);
        ctx =
            talloc_get_type_abort(dom->private_data,
                                  struct idmap_tdb_common_context);

        if (ctx->unixid_to_sid_fn == NULL) {
                unixid_to_sid_fn = idmap_tdb_common_unixid_to_sid;
        } else {
                unixid_to_sid_fn = ctx->unixid_to_sid_fn;
        }

        /* initialize the status to avoid surprise */
        for (i = 0; ids[i]; i++) {
                ids[i]->status = ID_UNKNOWN;
        }

        for (i = 0; ids[i]; i++) {
                ret = unixid_to_sid_fn(dom, ids[i]);
                if (!NT_STATUS_IS_OK(ret)) {

                        /* if it is just a failed mapping continue */
                        if (NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) {

                                /* make sure it is marked as unmapped */
                                ids[i]->status = ID_UNMAPPED;
                                continue;
                        }

                        /* some fatal error occurred, return immediately */
                        goto done;
                }

                /* all ok, id is mapped */
                ids[i]->status = ID_MAPPED;
                num_mapped += 1;
        }

        ret = NT_STATUS_OK;

done:

        if (NT_STATUS_IS_OK(ret)) {
                if (i == 0 || num_mapped == 0) {
                        ret = NT_STATUS_NONE_MAPPED;
                } else if (num_mapped < i) {
                        ret = STATUS_SOME_UNMAPPED;
                } else {
                        ret = NT_STATUS_OK;
                }
        }

        return ret;
}

/*
  default single id to sid lookup function
*/
NTSTATUS idmap_tdb_common_unixid_to_sid(struct idmap_domain * dom,
                                        struct id_map * map)
{
        NTSTATUS ret;
        TDB_DATA data;
        char *keystr;
        struct idmap_tdb_common_context *ctx;

        if (!dom || !map) {
                return NT_STATUS_INVALID_PARAMETER;
        }
/* TODO: do we really make sure the database is open again? should have been
 * done while initing the module
        status = idmap_tdb2_open_db(dom);
        NT_STATUS_NOT_OK_RETURN(status);
*/
        ctx =
            talloc_get_type_abort(dom->private_data,
                                  struct idmap_tdb_common_context);

        /* apply filters before checking */
        if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
                DEBUG(5,
                      ("Requested id (%u) out of range (%u - %u). Filtered!\n",
                       map->xid.id, dom->low_id, dom->high_id));
                return NT_STATUS_NONE_MAPPED;
        }

        switch (map->xid.type) {

        case ID_TYPE_UID:
                keystr =
                    talloc_asprintf(ctx, "UID %lu", (unsigned long)map->xid.id);
                break;

        case ID_TYPE_GID:
                keystr =
                    talloc_asprintf(ctx, "GID %lu", (unsigned long)map->xid.id);
                break;

        default:
                DEBUG(2, ("INVALID unix ID type: 0x02%x\n", map->xid.type));
                return NT_STATUS_INVALID_PARAMETER;
        }

        if (keystr == NULL) {
                DEBUG(0, ("Out of memory!\n"));
                ret = NT_STATUS_NO_MEMORY;
                goto done;
        }

        DEBUG(10, ("Fetching record %s\n", keystr));

        /* Check if the mapping exists */
        ret = dbwrap_fetch_bystring(ctx->db, keystr, keystr, &data);

        if (!NT_STATUS_IS_OK(ret)) {
                DEBUG(10, ("Record %s not found\n", keystr));
                ret = NT_STATUS_NONE_MAPPED;
                goto done;
        }

        if (!string_to_sid(map->sid, (const char *)data.dptr)) {
                DEBUG(10, ("INVALID SID (%s) in record %s\n",
                           (const char *)data.dptr, keystr));
                ret = NT_STATUS_INTERNAL_DB_ERROR;
                goto done;
        }

        DEBUG(10, ("Found record %s -> %s\n", keystr, (const char *)data.dptr));
        ret = NT_STATUS_OK;

      done:
        talloc_free(keystr);
        return ret;
}

/**********************************
 Single sid to id lookup function.
**********************************/

NTSTATUS idmap_tdb_common_sid_to_unixid(struct idmap_domain * dom,
                                        struct id_map * map)
{
        NTSTATUS ret;
        TDB_DATA data;
        char *keystr;
        unsigned long rec_id = 0;
        struct idmap_tdb_common_context *ctx;
        TALLOC_CTX *tmp_ctx = talloc_stackframe();

        if (!dom || !map) {
                talloc_free(tmp_ctx);
                return NT_STATUS_INVALID_PARAMETER;
        }

        ctx =
            talloc_get_type_abort(dom->private_data,
                                  struct idmap_tdb_common_context);

        keystr = sid_string_talloc(tmp_ctx, map->sid);
        if (keystr == NULL) {
                DEBUG(0, ("Out of memory!\n"));
                ret = NT_STATUS_NO_MEMORY;
                goto done;
        }

        DEBUG(10, ("Fetching record %s\n", keystr));

        /* Check if sid is present in database */
        ret = dbwrap_fetch_bystring(ctx->db, tmp_ctx, keystr, &data);
        if (!NT_STATUS_IS_OK(ret)) {
                DEBUG(10, ("Record %s not found\n", keystr));
                ret = NT_STATUS_NONE_MAPPED;
                goto done;
        }

        /* What type of record is this ? */
        if (sscanf((const char *)data.dptr, "UID %lu", &rec_id) == 1) {
                /* Try a UID record. */
                map->xid.id = rec_id;
                map->xid.type = ID_TYPE_UID;
                DEBUG(10,
                      ("Found uid record %s -> %s \n", keystr,
                       (const char *)data.dptr));
                ret = NT_STATUS_OK;

        } else if (sscanf((const char *)data.dptr, "GID %lu", &rec_id) == 1) {
                /* Try a GID record. */
                map->xid.id = rec_id;
                map->xid.type = ID_TYPE_GID;
                DEBUG(10,
                      ("Found gid record %s -> %s \n", keystr,
                       (const char *)data.dptr));
                ret = NT_STATUS_OK;

        } else {                /* Unknown record type ! */
                DEBUG(2,
                      ("Found INVALID record %s -> %s\n", keystr,
                       (const char *)data.dptr));
                ret = NT_STATUS_INTERNAL_DB_ERROR;
                goto done;
        }

        /* apply filters before returning result */
        if (!idmap_unix_id_is_in_range(map->xid.id, dom)) {
                DEBUG(5,
                      ("Requested id (%u) out of range (%u - %u). Filtered!\n",
                       map->xid.id, dom->low_id, dom->high_id));
                ret = NT_STATUS_NONE_MAPPED;
        }

      done:
        talloc_free(tmp_ctx);
        return ret;
}

/**********************************
 lookup a set of sids
**********************************/

struct idmap_tdb_common_sids_to_unixids_context {
        struct idmap_domain *dom;
        struct id_map **ids;
        bool allocate_unmapped;
         NTSTATUS(*sid_to_unixid_fn) (struct idmap_domain * dom,
                                      struct id_map * map);
};

static NTSTATUS idmap_tdb_common_sids_to_unixids_action(struct db_context *db,
                                                        void *private_data)
{
        struct idmap_tdb_common_sids_to_unixids_context *state;
        int i, num_mapped = 0;
        NTSTATUS ret = NT_STATUS_OK;

        state = (struct idmap_tdb_common_sids_to_unixids_context *)private_data;

        DEBUG(10, ("idmap_tdb_common_sids_to_unixids: "
                   " domain: [%s], allocate: %s\n",
                   state->dom->name, state->allocate_unmapped ? "yes" : "no"));

        for (i = 0; state->ids[i]; i++) {
                if ((state->ids[i]->status == ID_UNKNOWN) ||
                    /* retry if we could not map in previous run: */
                    (state->ids[i]->status == ID_UNMAPPED)) {
                        NTSTATUS ret2;

                        ret2 = state->sid_to_unixid_fn(state->dom,
                                        state->ids[i]);

                        if (!NT_STATUS_IS_OK(ret2)) {

                                /* if it is just a failed mapping, continue */
                                if (NT_STATUS_EQUAL
                                    (ret2, NT_STATUS_NONE_MAPPED)) {

                                        /* make sure it is marked as unmapped */
                                        state->ids[i]->status = ID_UNMAPPED;
                                        ret = STATUS_SOME_UNMAPPED;
                                } else {
                                        /*
                                         * some fatal error occurred,
                                         * return immediately
                                         */
                                        ret = ret2;
                                        goto done;
                                }
                        } else {
                                /* all ok, id is mapped */
                                state->ids[i]->status = ID_MAPPED;
                        }
                }

                if (state->ids[i]->status == ID_MAPPED) {
                        num_mapped += 1;
                }

                if ((state->ids[i]->status == ID_UNMAPPED) &&
                    state->allocate_unmapped) {
                        ret =
                            idmap_tdb_common_new_mapping(state->dom,
                                                         state->ids[i]);
                        if (!NT_STATUS_IS_OK(ret)) {
                                goto done;
                        }
                        num_mapped += 1;
                }
        }

done:

        if (NT_STATUS_IS_OK(ret) ||
            NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED)) {
                if (i == 0 || num_mapped == 0) {
                        ret = NT_STATUS_NONE_MAPPED;
                } else if (num_mapped < i) {
                        ret = STATUS_SOME_UNMAPPED;
                } else {
                        ret = NT_STATUS_OK;
                }
        }

        return ret;
}

NTSTATUS idmap_tdb_common_sids_to_unixids(struct idmap_domain * dom,
                                          struct id_map ** ids)
{
        NTSTATUS ret;
        int i;
        struct idmap_tdb_common_sids_to_unixids_context state;
        struct idmap_tdb_common_context *ctx;

        ctx =
            talloc_get_type_abort(dom->private_data,
                                  struct idmap_tdb_common_context);

        /* initialize the status to avoid surprise */
        for (i = 0; ids[i]; i++) {
                ids[i]->status = ID_UNKNOWN;
        }

        state.dom = dom;
        state.ids = ids;
        state.allocate_unmapped = false;
        if (ctx->sid_to_unixid_fn == NULL) {
                state.sid_to_unixid_fn = idmap_tdb_common_sid_to_unixid;
        } else {
                state.sid_to_unixid_fn = ctx->sid_to_unixid_fn;
        }

        ret = idmap_tdb_common_sids_to_unixids_action(ctx->db, &state);

        if ( (NT_STATUS_EQUAL(ret, STATUS_SOME_UNMAPPED) ||
              NT_STATUS_EQUAL(ret, NT_STATUS_NONE_MAPPED)) &&
             !dom->read_only) {
                state.allocate_unmapped = true;
                ret = dbwrap_trans_do(ctx->db,
                                      idmap_tdb_common_sids_to_unixids_action,
                                      &state);
        }

        return ret;
}