s4-prefixMap: dsdb_schema_pfm_oid_from_attid() to use const prefixMap

[Samba.git] / source4 / dsdb / schema / schema_prefixmap.c

/*
   Unix SMB/CIFS implementation.

   DRS::prefixMap implementation

   Copyright (C) Kamen Mazdrashki <kamen.mazdrashki@postpath.com> 2009

   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 "dsdb/samdb/samdb.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "../lib/util/asn1.h"


/**
 * Determine range type for supplied ATTID
 */
enum dsdb_attid_type dsdb_pfm_get_attid_type(uint32_t attid)
{
        if (attid <= 0x7FFFFFFF) {
                return DSDB_ATTID_TYPE_PFM;
        }
        else if (attid <= 0xBFFFFFFF) {
                return DSDB_ATTID_TYPE_INTID;
        }
        else if (attid <= 0xFFFEFFFF) {
                return DSDB_ATTID_TYPE_RESERVED;
        }
        else {
                return DSDB_ATTID_TYPE_INTERNAL;
        }
}

/**
 * Allocates schema_prefixMap object in supplied memory context
 */
static struct dsdb_schema_prefixmap *_dsdb_schema_prefixmap_talloc(TALLOC_CTX *mem_ctx,
                                                                   uint32_t length)
{
        struct dsdb_schema_prefixmap *pfm;

        pfm = talloc_zero(mem_ctx, struct dsdb_schema_prefixmap);
        if (!pfm) {
                return NULL;
        }

        pfm->length = length;
        pfm->prefixes = talloc_zero_array(pfm, struct dsdb_schema_prefixmap_oid,
                                          pfm->length);
        if (!pfm->prefixes) {
                talloc_free(pfm);
                return NULL;
        }

        return pfm;
}

/**
 * Initial prefixMap creation according to:
 * [MS-DRSR] section 5.12.2
 */
WERROR dsdb_schema_pfm_new(TALLOC_CTX *mem_ctx, struct dsdb_schema_prefixmap **_pfm)
{
        uint32_t i;
        struct dsdb_schema_prefixmap *pfm;
        const struct {
                uint32_t        id;
                const char      *oid_prefix;
        } pfm_init_data[] = {
                {.id=0x00000000, .oid_prefix="2.5.4"},
                {.id=0x00000001, .oid_prefix="2.5.6"},
                {.id=0x00000002, .oid_prefix="1.2.840.113556.1.2"},
                {.id=0x00000003, .oid_prefix="1.2.840.113556.1.3"},
                {.id=0x00000004, .oid_prefix="2.16.840.1.101.2.2.1"},
                {.id=0x00000005, .oid_prefix="2.16.840.1.101.2.2.3"},
                {.id=0x00000006, .oid_prefix="2.16.840.1.101.2.1.5"},
                {.id=0x00000007, .oid_prefix="2.16.840.1.101.2.1.4"},
                {.id=0x00000008, .oid_prefix="2.5.5"},
                {.id=0x00000009, .oid_prefix="1.2.840.113556.1.4"},
                {.id=0x0000000A, .oid_prefix="1.2.840.113556.1.5"},
                {.id=0x00000013, .oid_prefix="0.9.2342.19200300.100"},
                {.id=0x00000014, .oid_prefix="2.16.840.1.113730.3"},
                {.id=0x00000015, .oid_prefix="0.9.2342.19200300.100.1"},
                {.id=0x00000016, .oid_prefix="2.16.840.1.113730.3.1"},
                {.id=0x00000017, .oid_prefix="1.2.840.113556.1.5.7000"},
                {.id=0x00000018, .oid_prefix="2.5.21"},
                {.id=0x00000019, .oid_prefix="2.5.18"},
                {.id=0x0000001A, .oid_prefix="2.5.20"},
        };

        /* allocate mem for prefix map */
        pfm = _dsdb_schema_prefixmap_talloc(mem_ctx, ARRAY_SIZE(pfm_init_data));
        W_ERROR_HAVE_NO_MEMORY(pfm);

        /* build prefixes */
        for (i = 0; i < pfm->length; i++) {
                if (!ber_write_partial_OID_String(pfm, &pfm->prefixes[i].bin_oid, pfm_init_data[i].oid_prefix)) {
                        talloc_free(pfm);
                        return WERR_INTERNAL_ERROR;
                }
                pfm->prefixes[i].id = pfm_init_data[i].id;
        }

        *_pfm = pfm;

        return WERR_OK;
}


/**
 * Adds oid to prefix map.
 * On success returns ID for newly added index
 * or ID of existing entry that matches oid
 * Reference: [MS-DRSR] section 5.12.2
 *
 * \param pfm prefixMap
 * \param bin_oid OID prefix to be added to prefixMap
 * \param pfm_id Location where to store prefixMap entry ID
 */
static WERROR _dsdb_schema_pfm_add_entry(struct dsdb_schema_prefixmap *pfm, DATA_BLOB bin_oid, uint32_t *_idx)
{
        uint32_t i;
        struct dsdb_schema_prefixmap_oid * pfm_entry;
        struct dsdb_schema_prefixmap_oid * prefixes_new;

        /* dup memory for bin-oid prefix to be added */
        bin_oid = data_blob_dup_talloc(pfm, &bin_oid);
        W_ERROR_HAVE_NO_MEMORY(bin_oid.data);

        /* make room for new entry */
        prefixes_new = talloc_realloc(pfm, pfm->prefixes, struct dsdb_schema_prefixmap_oid, pfm->length + 1);
        if (!prefixes_new) {
                talloc_free(bin_oid.data);
                return WERR_NOMEM;
        }
        pfm->prefixes = prefixes_new;

        /* make new unique ID in prefixMap */
        pfm_entry = &pfm->prefixes[pfm->length];
        pfm_entry->id = 0;
        for (i = 0; i < pfm->length; i++) {
                if (pfm_entry->id < pfm->prefixes[i].id)
                        pfm_entry->id = pfm->prefixes[i].id;
        }

        /* add new bin-oid prefix */
        pfm_entry->id++;
        pfm_entry->bin_oid = bin_oid;

        *_idx = pfm->length;
        pfm->length++;

        return WERR_OK;
}


/**
 * Make partial binary OID for supplied OID.
 * Reference: [MS-DRSR] section 5.12.2
 */
static WERROR _dsdb_pfm_make_binary_oid(const char *full_oid, TALLOC_CTX *mem_ctx,
                                        DATA_BLOB *_bin_oid, uint32_t *_last_subid)
{
        uint32_t last_subid;
        const char *oid_subid;

        /* make last sub-identifier value */
        oid_subid = strrchr(full_oid, '.');
        if (!oid_subid) {
                return WERR_INVALID_PARAMETER;
        }
        oid_subid++;
        last_subid = strtoul(oid_subid, NULL, 10);

        /* encode oid in BER format */
        if (!ber_write_OID_String(mem_ctx, _bin_oid, full_oid)) {
                DEBUG(0,("ber_write_OID_String() failed for %s\n", full_oid));
                return WERR_INTERNAL_ERROR;
        }

        /* get the prefix of the OID */
        if (last_subid < 128) {
                _bin_oid->length -= 1;
        } else {
                _bin_oid->length -= 2;
        }

        /* return last_value if requested */
        if (_last_subid) {
                *_last_subid = last_subid;
        }

        return WERR_OK;
}

/**
 * Lookup partial-binary-oid in prefixMap
 */
WERROR dsdb_schema_pfm_find_binary_oid(const struct dsdb_schema_prefixmap *pfm,
                                       DATA_BLOB bin_oid,
                                       uint32_t *_idx)
{
        uint32_t i;

        for (i = 0; i < pfm->length; i++) {
                if (pfm->prefixes[i].bin_oid.length != bin_oid.length) {
                        continue;
                }

                if (memcmp(pfm->prefixes[i].bin_oid.data, bin_oid.data, bin_oid.length) == 0) {
                        if (_idx) {
                                *_idx = i;
                        }
                        return WERR_OK;
                }
        }

        return WERR_NOT_FOUND;
}

/**
 * Lookup full-oid in prefixMap
 * Note: this may be slow.
 */
WERROR dsdb_schema_pfm_find_oid(const struct dsdb_schema_prefixmap *pfm,
                                const char *full_oid,
                                uint32_t *_idx)
{
        WERROR werr;
        DATA_BLOB bin_oid;

        ZERO_STRUCT(bin_oid);

        /* make partial-binary-oid to look for */
        werr = _dsdb_pfm_make_binary_oid(full_oid, NULL, &bin_oid, NULL);
        W_ERROR_NOT_OK_RETURN(werr);

        /* lookup the partial-oid */
        werr = dsdb_schema_pfm_find_binary_oid(pfm, bin_oid, _idx);

        data_blob_free(&bin_oid);

        return werr;
}

/**
 * Make ATTID for given OID
 * If OID is not in prefixMap, new prefix
 * may be added depending on 'can_change_pfm' flag
 * Reference: [MS-DRSR] section 5.12.2
 */
static WERROR dsdb_schema_pfm_make_attid_impl(struct dsdb_schema_prefixmap *pfm,
                                              const char *oid,
                                              bool can_change_pfm,
                                              uint32_t *attid)
{
        WERROR werr;
        uint32_t idx;
        uint32_t lo_word, hi_word;
        uint32_t last_subid;
        DATA_BLOB bin_oid;

        if (!pfm) {
                return WERR_INVALID_PARAMETER;
        }
        if (!oid) {
                return WERR_INVALID_PARAMETER;
        }

        werr = _dsdb_pfm_make_binary_oid(oid, pfm, &bin_oid, &last_subid);
        W_ERROR_NOT_OK_RETURN(werr);

        /* search the prefix in the prefix table, if none found, add
         * one entry for new prefix.
         */
        werr = dsdb_schema_pfm_find_binary_oid(pfm, bin_oid, &idx);
        if (W_ERROR_IS_OK(werr)) {
                /* free memory allocated for bin_oid */
                data_blob_free(&bin_oid);
        } else {
                /* return error in read-only mode */
                if (!can_change_pfm) {
                        return werr;
                }

                /* entry does not exists, add it */
                werr = _dsdb_schema_pfm_add_entry(pfm, bin_oid, &idx);
                W_ERROR_NOT_OK_RETURN(werr);
        }

        /* compose the attid */
        lo_word = last_subid % 16384;   /* actually get lower 14 bits: lo_word & 0x3FFF */
        if (last_subid >= 16384) {
                /* mark it so that it is known to not be the whole lastValue
                 * This will raise 16-th bit*/
                lo_word += 32768;
        }
        hi_word = pfm->prefixes[idx].id;

        /* make ATTID:
         * HIWORD is prefixMap id
         * LOWORD is truncated binary-oid */
        *attid = (hi_word * 65536) + lo_word;

        return WERR_OK;
}

/**
 * Make ATTID for given OID
 * Reference: [MS-DRSR] section 5.12.2
 *
 * Note: This function may change prefixMap if prefix
 * for supplied 'oid' doesn't exists yet.
 * It is recommended to be used mostly when caller
 * want to add new prefixes.
 * Otherwise dsdb_schema_pfm_attid_from_oid() should be used.
 */
WERROR dsdb_schema_pfm_make_attid(struct dsdb_schema_prefixmap *pfm,
                                  const char *oid,
                                  uint32_t *attid)
{
        return dsdb_schema_pfm_make_attid_impl(pfm, oid, true, attid);
}

/**
 * Make ATTID for given OID
 * Reference: [MS-DRSR] section 5.12.2
 */
WERROR dsdb_schema_pfm_attid_from_oid(struct dsdb_schema_prefixmap *pfm,
                                      const char *oid,
                                      uint32_t *attid)
{
        return dsdb_schema_pfm_make_attid_impl(pfm, oid, false, attid);
}

/**
 * Make OID for given ATTID.
 * Reference: [MS-DRSR] section 5.12.2
 */
WERROR dsdb_schema_pfm_oid_from_attid(const struct dsdb_schema_prefixmap *pfm,
                                      uint32_t attid,
                                      TALLOC_CTX *mem_ctx, const char **_oid)
{
        uint32_t i;
        uint32_t hi_word, lo_word;
        DATA_BLOB bin_oid = {NULL, 0};
        struct dsdb_schema_prefixmap_oid *pfm_entry;
        WERROR werr = WERR_OK;

        /* sanity check for attid requested */
        if (dsdb_pfm_get_attid_type(attid) != DSDB_ATTID_TYPE_PFM) {
                return WERR_INVALID_PARAMETER;
        }

        /* crack attid value */
        hi_word = attid >> 16;
        lo_word = attid & 0xFFFF;

        /* locate corRespoNding prefixMap entry */
        pfm_entry = NULL;
        for (i = 0; i < pfm->length; i++) {
                if (hi_word == pfm->prefixes[i].id) {
                        pfm_entry = &pfm->prefixes[i];
                        break;
                }
        }

        if (!pfm_entry) {
                DEBUG(1,("Failed to find prefixMap entry for ATTID = 0x%08X (%d)\n",
                         attid, attid));
                return WERR_DS_NO_ATTRIBUTE_OR_VALUE;
        }

        /* copy oid prefix making enough room */
        bin_oid.length = pfm_entry->bin_oid.length + 2;
        bin_oid.data = talloc_array(mem_ctx, uint8_t, bin_oid.length);
        W_ERROR_HAVE_NO_MEMORY(bin_oid.data);
        memcpy(bin_oid.data, pfm_entry->bin_oid.data, pfm_entry->bin_oid.length);

        if (lo_word < 128) {
                bin_oid.length = bin_oid.length - 1;
                bin_oid.data[bin_oid.length-1] = lo_word;
        }
        else {
                if (lo_word >= 32768) {
                        lo_word -= 32768;
                }
                bin_oid.data[bin_oid.length-2] = (0x80 | ((lo_word>>7) & 0x7f));
                bin_oid.data[bin_oid.length-1] = lo_word & 0x7f;
        }

        if (!ber_read_OID_String(mem_ctx, bin_oid, _oid)) {
                DEBUG(0,("ber_read_OID_String() failed for %s\n",
                         hex_encode_talloc(bin_oid.data, bin_oid.data, bin_oid.length)));
                werr = WERR_INTERNAL_ERROR;
        }

        /* free locally allocated memory */
        talloc_free(bin_oid.data);

        return werr;
}


/**
 * Verifies drsuapi mappings.
 */
static WERROR _dsdb_drsuapi_pfm_verify(const struct drsuapi_DsReplicaOIDMapping_Ctr *ctr,
                                       bool have_schema_info)
{
        uint32_t i;
        uint32_t num_mappings;
        struct drsuapi_DsReplicaOIDMapping *mapping;

        /* check input params */
        if (!ctr) {
                return WERR_INVALID_PARAMETER;
        }
        if (!ctr->mappings) {
                return WERR_INVALID_PARAMETER;
        }
        num_mappings = ctr->num_mappings;

        if (have_schema_info) {
                DATA_BLOB blob;

                if (ctr->num_mappings < 2) {
                        return WERR_INVALID_PARAMETER;
                }

                /* check last entry for being special */
                mapping = &ctr->mappings[ctr->num_mappings - 1];
                if (mapping->id_prefix != 0) {
                        return WERR_INVALID_PARAMETER;
                }

                /* verify schemaInfo blob is valid one */
                blob = data_blob_const(mapping->oid.binary_oid, mapping->oid.length);
                if (!dsdb_schema_info_blob_is_valid(&blob)) {
                        return WERR_INVALID_PARAMETER;
                }

                /* get number of read mappings in the map */
                num_mappings--;
        }

        /* now, verify rest of entries for being at least not null */
        for (i = 0; i < num_mappings; i++) {
                mapping = &ctr->mappings[i];
                if (!mapping->oid.length) {
                        return WERR_INVALID_PARAMETER;
                }
                if (!mapping->oid.binary_oid) {
                        return WERR_INVALID_PARAMETER;
                }
                /* check it is not the special entry */
                if (*mapping->oid.binary_oid == 0xFF) {
                        return WERR_INVALID_PARAMETER;
                }
        }

        return WERR_OK;
}

/**
 * Convert drsuapi_ prefix map to prefixMap internal presentation.
 *
 * \param ctr Pointer to drsuapi_DsReplicaOIDMapping_Ctr which represents drsuapi_ prefixMap
 * \param have_schema_info if drsuapi_prefixMap have schem_info in it or not
 * \param mem_ctx TALLOC_CTX to make allocations in
 * \param _pfm Out pointer to hold newly created prefixMap
 * \param _schema_info Out param to store schema_info to. If NULL, schema_info is not decoded
 */
WERROR dsdb_schema_pfm_from_drsuapi_pfm(const struct drsuapi_DsReplicaOIDMapping_Ctr *ctr,
                                        bool have_schema_info,
                                        TALLOC_CTX *mem_ctx,
                                        struct dsdb_schema_prefixmap **_pfm,
                                        const char **_schema_info)
{
        WERROR werr;
        uint32_t i;
        DATA_BLOB blob;
        uint32_t num_mappings;
        struct dsdb_schema_prefixmap *pfm;

        if (!_pfm) {
                return WERR_INVALID_PARAMETER;
        }

        /*
         * error out if schema_info is requested
         * but it is not in the drsuapi_prefixMap
         */
        if (_schema_info && !have_schema_info) {
                return WERR_INVALID_PARAMETER;
        }

        /* verify drsuapi_pefixMap */
        werr =_dsdb_drsuapi_pfm_verify(ctr, have_schema_info);
        W_ERROR_NOT_OK_RETURN(werr);

        /* allocate mem for prefix map */
        num_mappings = ctr->num_mappings;
        if (have_schema_info) {
                num_mappings--;
        }
        pfm = _dsdb_schema_prefixmap_talloc(mem_ctx, num_mappings);
        W_ERROR_HAVE_NO_MEMORY(pfm);

        /* copy entries from drsuapi_prefixMap */
        for (i = 0; i < pfm->length; i++) {
                blob = data_blob_talloc(pfm,
                                        ctr->mappings[i].oid.binary_oid,
                                        ctr->mappings[i].oid.length);
                if (!blob.data) {
                        talloc_free(pfm);
                        return WERR_NOMEM;
                }
                pfm->prefixes[i].id = ctr->mappings[i].id_prefix;
                pfm->prefixes[i].bin_oid = blob;
        }

        /* fetch schema_info if requested */
        if (_schema_info) {
                /* by this time, i should have this value,
                 *  but set it here for clarity */
                i = ctr->num_mappings - 1;

                *_schema_info = hex_encode_talloc(mem_ctx,
                                                  ctr->mappings[i].oid.binary_oid,
                                                  ctr->mappings[i].oid.length);
                if (!*_schema_info) {
                        talloc_free(pfm);
                        return WERR_NOMEM;
                }
        }

        /* schema_prefixMap created successfully */
        *_pfm = pfm;

        return WERR_OK;
}

/**
 * Convert drsuapi_ prefix map to prefixMap internal presentation.
 *
 * \param pfm Schema prefixMap to be converted
 * \param schema_info schema_info string - if NULL, we don't need it
 * \param mem_ctx TALLOC_CTX to make allocations in
 * \param _ctr Out pointer to drsuapi_DsReplicaOIDMapping_Ctr prefix map structure
 */
WERROR dsdb_drsuapi_pfm_from_schema_pfm(const struct dsdb_schema_prefixmap *pfm,
                                        const char *schema_info,
                                        TALLOC_CTX *mem_ctx,
                                        struct drsuapi_DsReplicaOIDMapping_Ctr **_ctr)
{
        uint32_t i;
        DATA_BLOB blob;
        struct drsuapi_DsReplicaOIDMapping_Ctr *ctr;

        if (!_ctr) {
                return WERR_INVALID_PARAMETER;
        }
        if (!pfm) {
                return WERR_INVALID_PARAMETER;
        }
        if (pfm->length == 0) {
                return WERR_INVALID_PARAMETER;
        }

        /* allocate memory for the structure */
        ctr = talloc_zero(mem_ctx, struct drsuapi_DsReplicaOIDMapping_Ctr);
        W_ERROR_HAVE_NO_MEMORY(ctr);

        ctr->num_mappings = (schema_info ? pfm->length + 1 : pfm->length);
        ctr->mappings = talloc_array(ctr, struct drsuapi_DsReplicaOIDMapping, ctr->num_mappings);
        if (!ctr->mappings) {
                talloc_free(ctr);
                return WERR_NOMEM;
        }

        /* copy entries from schema_prefixMap */
        for (i = 0; i < pfm->length; i++) {
                blob = data_blob_dup_talloc(ctr, &pfm->prefixes[i].bin_oid);
                if (!blob.data) {
                        talloc_free(ctr);
                        return WERR_NOMEM;
                }
                ctr->mappings[i].id_prefix = pfm->prefixes[i].id;
                ctr->mappings[i].oid.length = blob.length;
                ctr->mappings[i].oid.binary_oid = blob.data;
        }

        /* make schema_info entry if needed */
        if (schema_info) {
                /* by this time, i should have this value,
                 *  but set it here for clarity */
                i = ctr->num_mappings - 1;

                blob = strhex_to_data_blob(ctr, schema_info);
                if (!blob.data) {
                        talloc_free(ctr);
                        return WERR_NOMEM;
                }

                ctr->mappings[i].id_prefix = 0;
                ctr->mappings[i].oid.length = blob.length;
                ctr->mappings[i].oid.binary_oid = blob.data;
        }

        /* drsuapi_prefixMap constructed successfully */
        *_ctr = ctr;

        return WERR_OK;
}

/**
 * Verifies schema prefixMap and drsuapi prefixMap are same.
 * Note that we just need to verify pfm contains prefixes
 * from ctr, not that those prefixes has same id_prefix.
 */
WERROR dsdb_schema_pfm_contains_drsuapi_pfm(const struct dsdb_schema_prefixmap *pfm,
                                            const struct drsuapi_DsReplicaOIDMapping_Ctr *ctr)
{
        WERROR werr;
        uint32_t i;
        uint32_t idx;
        DATA_BLOB bin_oid;

        /* verify drsuapi_pefixMap */
        werr = _dsdb_drsuapi_pfm_verify(ctr, true);
        W_ERROR_NOT_OK_RETURN(werr);

        /* check pfm contains every entry from ctr, except the last one */
        for (i = 0; i < ctr->num_mappings - 1; i++) {
                bin_oid.length = ctr->mappings[i].oid.length;
                bin_oid.data   = ctr->mappings[i].oid.binary_oid;

                werr = dsdb_schema_pfm_find_binary_oid(pfm, bin_oid, &idx);
                if (!W_ERROR_IS_OK(werr)) {
                        return WERR_DS_DRA_SCHEMA_MISMATCH;
                }
        }

        return WERR_OK;
}