svc_auth_unix.c

Go to the documentation of this file.

/*
 * Copyright (c) 2009, Sun Microsystems, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 * - Neither the name of Sun Microsystems, Inc. nor the names of its
 *   contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
 
/*
 * svc_auth_unix.c
 * Handles UNIX flavor authentication parameters on the service side of rpc.
 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
 * _svcauth_unix does full blown unix style uid,gid+gids auth,
 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
 * Note: the shorthand has been gutted for efficiency.
 *
 * Copyright (C) 1984, Sun Microsystems, Inc.
 */
#include <wintirpc.h>
//#include <pthread.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
 
#include <rpc/rpc.h>
 
/*
 * Unix longhand authenticator
 */
enum auth_stat
_svcauth_unix(rqst, msg)
    struct svc_req *rqst;
    struct rpc_msg *msg;
{
    enum auth_stat stat;
    XDR xdrs;
    struct authunix_parms *aup;
    int32_t *buf;
    struct area {
        struct authunix_parms area_aup;
        char area_machname[MAX_MACHINE_NAME+1];
        gid_t area_gids[NGRPS];
    } *area;
    u_int auth_len;
    size_t str_len, gid_len;
    u_int i;
 
    assert(rqst != NULL);
    assert(msg != NULL);
 
    area = (struct area *) rqst->rq_clntcred;
    aup = &area->area_aup;
    aup->aup_machname = area->area_machname;
    aup->aup_gids = area->area_gids;
    auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
    xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
    buf = XDR_INLINE(&xdrs, auth_len);
    if (buf != NULL) {
        aup->aup_time = IXDR_GET_INT32(buf);
        str_len = (size_t)IXDR_GET_U_INT32(buf);
        if (str_len > MAX_MACHINE_NAME) {
            stat = AUTH_BADCRED;
            goto done;
        }
        memmove(aup->aup_machname, buf, str_len);
        aup->aup_machname[str_len] = 0;
        str_len = RNDUP(str_len);
        buf += str_len / sizeof (int32_t);
        aup->aup_uid = (int)IXDR_GET_INT32(buf);
        aup->aup_gid = (int)IXDR_GET_INT32(buf);
        gid_len = (size_t)IXDR_GET_U_INT32(buf);
        if (gid_len > NGRPS) {
            stat = AUTH_BADCRED;
            goto done;
        }
        aup->aup_len = gid_len;
        for (i = 0; i < gid_len; i++) {
            aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
        }
        /*
         * five is the smallest unix credentials structure -
         * timestamp, hostname len (0), uid, gid, and gids len (0).
         */
        if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
            (void) printf("bad auth_len gid %ld str %ld auth %u\n",
                (long)gid_len, (long)str_len, auth_len);
            stat = AUTH_BADCRED;
            goto done;
        }
    } else if (! xdr_authunix_parms(&xdrs, aup)) {
        xdrs.x_op = XDR_FREE;
        (void)xdr_authunix_parms(&xdrs, aup);
        stat = AUTH_BADCRED;
        goto done;
    }
 
       /* get the verifier */
    if ((u_int)msg->rm_call.cb_verf.oa_length) {
        rqst->rq_xprt->xp_verf.oa_flavor =
            msg->rm_call.cb_verf.oa_flavor;
        rqst->rq_xprt->xp_verf.oa_base =
            msg->rm_call.cb_verf.oa_base;
        rqst->rq_xprt->xp_verf.oa_length =
            msg->rm_call.cb_verf.oa_length;
    } else {
        rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
        rqst->rq_xprt->xp_verf.oa_length = 0;
    }
    stat = AUTH_OK;
done:
    XDR_DESTROY(&xdrs);
    return (stat);
}
 
 
/*
 * Shorthand unix authenticator
 * Looks up longhand in a cache.
 */
/*ARGSUSED*/
enum auth_stat 
_svcauth_short(rqst, msg)
    struct svc_req *rqst;
    struct rpc_msg *msg;
{
    return (AUTH_REJECTEDCRED);
}