idmap/idmapd/directory_provider_builtin.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*
 * Retrieve directory information for built-in users and groups
 */

#include <stdio.h>
#include <limits.h>
#include <sys/idmap.h>
#include <sys/param.h>
#include <string.h>
#include <stdlib.h>
#include <netdb.h>
#include <libuutil.h>
#include <note.h>
#include "idmapd.h"
#include "directory.h"
#include "directory_private.h"
#include <rpcsvc/idmap_prot.h>
#include "directory_server_impl.h"
#include "sidutil.h"

static directory_error_t sid_dav(directory_values_rpc *lvals,
    const wksids_table_t *wksid);
static directory_error_t directory_provider_builtin_populate(
    directory_entry_rpc *pent, const wksids_table_t *wksid,
    idmap_utf8str_list *attrs);

/*
 * Retrieve information by name.
 * Called indirectly through the directory_provider_static structure.
 */
static
directory_error_t
directory_provider_builtin_get(
    directory_entry_rpc *del,
    idmap_utf8str_list *ids,
    idmap_utf8str types,
    idmap_utf8str_list *attrs)
{
    int i;

    for (i = 0; i < ids->idmap_utf8str_list_len; i++) {
        const wksids_table_t *wksid;
        directory_error_t de;
        int type;

        /*
         * Extract the type for this particular ID.
         * Advance to the next type, if it's there, else keep
         * using this type until we run out of IDs.
         */
        type = *types;
        if (*(types+1) != '\0')
            types++;

        /*
         * If this entry has already been handled, one way or another,
         * skip it.
         */
        if (del[i].status != DIRECTORY_NOT_FOUND)
            continue;

        char *id = ids->idmap_utf8str_list_val[i];

        /*
         * End-to-end error injection point.
         * NEEDSWORK:  should probably eliminate this for production
         */
        if (uu_streq(id, " DEBUG BUILTIN ERROR ")) {
            directory_entry_set_error(&del[i],
                directory_error("Directory_provider_builtin.debug",
                "Directory_provider_builtin:  artificial error",
                NULL));
            continue;
        }

        if (type == DIRECTORY_ID_SID[0])
            wksid = find_wk_by_sid(id);
        else {
            int idmap_id_type;
            if (type == DIRECTORY_ID_NAME[0])
                idmap_id_type = IDMAP_POSIXID;
            else if (type == DIRECTORY_ID_USER[0])
                idmap_id_type = IDMAP_UID;
            else if (type == DIRECTORY_ID_GROUP[0])
                idmap_id_type = IDMAP_GID;
            else {
                directory_entry_set_error(&del[i],
                    directory_error("invalid_arg.id_type",
                    "Invalid ID type \"%1\"",
                    types, NULL));
                continue;
            }

            int id_len = strlen(id);
            char name[id_len + 1];
            char domain[id_len + 1];

            split_name(name, domain, id);

            wksid = find_wksid_by_name(name, domain, idmap_id_type);
        }

        if (wksid == NULL)
            continue;

        de = directory_provider_builtin_populate(&del[i], wksid, attrs);
        if (de != NULL) {
            directory_entry_set_error(&del[i], de);
            de = NULL;
        }
    }

    return (NULL);
}

/*
 * Given a well-known name entry and a list of attributes that were
 * requested, populate the structure to return to the caller.
 */
static
directory_error_t
directory_provider_builtin_populate(
    directory_entry_rpc *pent,
    const wksids_table_t *wksid,
    idmap_utf8str_list *attrs)
{
    int j;
    directory_values_rpc *llvals;
    int nattrs;

    nattrs = attrs->idmap_utf8str_list_len;

    llvals = calloc(nattrs, sizeof (directory_values_rpc));
    if (llvals == NULL)
        goto nomem;

    pent->status = DIRECTORY_FOUND;
    pent->directory_entry_rpc_u.attrs.attrs_val = llvals;
    pent->directory_entry_rpc_u.attrs.attrs_len = nattrs;

    for (j = 0; j < nattrs; j++) {
        directory_values_rpc *val;
        char *a;
        directory_error_t de;

        /*
         * We're going to refer to these a lot, so make a shorthand
         * copy.
         */
        a = attrs->idmap_utf8str_list_val[j];
        val = &llvals[j];

        /*
         * Start by assuming no errors and that we don't have
         * the information.
         */
        val->found = FALSE;
        de = NULL;

        if (uu_strcaseeq(a, "uid")) {
            de = str_list_dav(val, &wksid->winname, 1);
        } else if (uu_strcaseeq(a, "uidNumber")) {
            if (wksid->pid != IDMAP_SENTINEL_PID &&
                wksid->is_user) {
                de = uint_list_dav(val, &wksid->pid, 1);
            }
        } else if (uu_strcaseeq(a, "gidNumber")) {
            if (wksid->pid != IDMAP_SENTINEL_PID &&
                !wksid->is_user) {
                de = uint_list_dav(val, &wksid->pid, 1);
            }
        } else if (uu_strcaseeq(a, "displayName") ||
            uu_strcaseeq(a, "cn")) {
            de = str_list_dav(val, &wksid->winname, 1);
        } else if (uu_strcaseeq(a, "distinguishedName")) {
            char *container;
            if (wksid->domain == NULL) {
                container = "Users";
            } else {
                container = "Builtin";
            }
            RDLOCK_CONFIG();
            char *dn;
            (void) asprintf(&dn,
                "CN=%s,CN=%s,DC=%s",
                wksid->winname, container, _idmapdstate.hostname);
            UNLOCK_CONFIG();
            const char *cdn = dn;
            de = str_list_dav(val, &cdn, 1);
            free(dn);
        } else if (uu_strcaseeq(a, "objectClass")) {
            if (wksid->is_wuser) {
                static const char *objectClasses[] = {
                    "top",
                    "person",
                    "organizationalPerson",
                    "user",
                };
                de = str_list_dav(val, objectClasses,
                    UU_NELEM(objectClasses));
            } else {
                static const char *objectClasses[] = {
                    "top",
                    "group",
                };
                de = str_list_dav(val, objectClasses,
                    UU_NELEM(objectClasses));
            }
        } else if (uu_strcaseeq(a, "objectSid")) {
            de = sid_dav(val, wksid);
        } else if (uu_strcaseeq(a, "x-sun-canonicalName")) {
            char *canon;

            if (wksid->domain == NULL) {
                RDLOCK_CONFIG();
                (void) asprintf(&canon, "%s@%s",
                    wksid->winname, _idmapdstate.hostname);
                UNLOCK_CONFIG();
            } else if (uu_streq(wksid->domain, "")) {
                canon = strdup(wksid->winname);
            } else {
                (void) asprintf(&canon, "%s@%s",
                    wksid->winname, wksid->domain);
            }

            if (canon == NULL)
                goto nomem;
            const char *ccanon = canon;
            de = str_list_dav(val, &ccanon, 1);
            free(canon);
        } else if (uu_strcaseeq(a, "x-sun-provider")) {
            const char *provider = "Builtin";
            de = str_list_dav(val, &provider, 1);
        }
        if (de != NULL)
            return (de);
    }

    return (NULL);

nomem:
    return (directory_error("ENOMEM.users",
        "No memory allocating return value for user lookup", NULL));
}

/*
 * Given a well-known name structure, generate a binary-format SID.
 * It's a bit perverse that we must take a text-format SID and turn it into
 * a binary-format SID, only to have the caller probably turn it back into
 * text format, but SIDs are carried across LDAP in binary format.
 */
static
directory_error_t
sid_dav(directory_values_rpc *lvals, const wksids_table_t *wksid)
{
    char *text_sid;
    sid_t *sid;
    directory_error_t de;

    if (wksid->sidprefix == NULL) {
        RDLOCK_CONFIG();
        (void) asprintf(&text_sid, "%s-%d",
            _idmapdstate.cfg->pgcfg.machine_sid,
            wksid->rid);
        UNLOCK_CONFIG();
    } else {
        (void) asprintf(&text_sid, "%s-%d",
            wksid->sidprefix, wksid->rid);
    }

    if (text_sid == NULL)
        goto nomem;

    sid = sid_fromstr(text_sid);
    free(text_sid);

    if (sid == NULL)
        goto nomem;

    sid_to_le(sid);

    de = bin_list_dav(lvals, sid, 1, sid_len(sid));

    sid_free(sid);

    return (de);

nomem:
    return (directory_error("ENOMEM.sid_dav",
        "No memory allocating SID for user lookup", NULL));
}

struct directory_provider_static directory_provider_builtin = {
    "builtin",
    directory_provider_builtin_get,
};