FreeBSD/Linux Kernel Cross Reference
sys/rpc/svc_auth_unix.c

     /*-
      * 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.
     */
    
    #if defined(LIBC_SCCS) && !defined(lint)
    static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
    static char *sccsid = "@(#)svc_auth_unix.c      2.3 88/08/01 4.0 RPCSRC";
    #endif
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/11.2/sys/rpc/svc_auth_unix.c 331722 2018-03-29 02:50:57Z eadler $");
    
    /*
     * 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 <sys/param.h>
    #include <sys/lock.h>
    #include <sys/mutex.h>
    #include <sys/systm.h>
    #include <sys/ucred.h>
    
    #include <rpc/rpc.h>
    
    #include <rpc/rpc_com.h>
    
    #define MAX_MACHINE_NAME        255
    #define NGRPS                   16
    
    /*
     * Unix longhand authenticator
     */
    enum auth_stat
    _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
    {
            enum auth_stat stat;
            XDR xdrs;
            int32_t *buf;
            uint32_t time;
            struct xucred *xcr;
            u_int auth_len;
            size_t str_len, gid_len;
            u_int i;
    
            xcr = rqst->rq_clntcred;
            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) {
                    time = IXDR_GET_UINT32(buf);
                    str_len = (size_t)IXDR_GET_UINT32(buf);
                    if (str_len > MAX_MACHINE_NAME) {
                            stat = AUTH_BADCRED;
                            goto done;
                    }
                    str_len = RNDUP(str_len);
                    buf += str_len / sizeof (int32_t);
                    xcr->cr_uid = IXDR_GET_UINT32(buf);
                    xcr->cr_groups[0] = IXDR_GET_UINT32(buf);
                    gid_len = (size_t)IXDR_GET_UINT32(buf);
                    if (gid_len > NGRPS) {
                            stat = AUTH_BADCRED;
                            goto done;
                    }
                    for (i = 0; i < gid_len; i++) {
                            if (i + 1 < XU_NGROUPS)
                                    xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf);
                            else
                                   buf++;
                   }
                   if (gid_len + 1 > XU_NGROUPS)
                           xcr->cr_ngroups = XU_NGROUPS;
                   else
                           xcr->cr_ngroups = gid_len + 1;
   
                   /*
                    * 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, &time, xcr)) {
                   stat = AUTH_BADCRED;
                   goto done;
           }
   
           rqst->rq_verf = _null_auth;
           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);
   }

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