The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright (c) 2009, Sun Microsystems, Inc.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without 
    6  * modification, are permitted provided that the following conditions are met:
    7  * - Redistributions of source code must retain the above copyright notice, 
    8  *   this list of conditions and the following disclaimer.
    9  * - Redistributions in binary form must reproduce the above copyright notice, 
   10  *   this list of conditions and the following disclaimer in the documentation 
   11  *   and/or other materials provided with the distribution.
   12  * - Neither the name of Sun Microsystems, Inc. nor the names of its 
   13  *   contributors may be used to endorse or promote products derived 
   14  *   from this software without specific prior written permission.
   15  * 
   16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
   17  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
   19  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 
   20  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
   21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
   22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 
   23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
   24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
   25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
   26  * POSSIBILITY OF SUCH DAMAGE.
   27  */
   28 
   29 #if defined(LIBC_SCCS) && !defined(lint)
   30 static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
   31 static char *sccsid = "@(#)svc_auth_unix.c      2.3 88/08/01 4.0 RPCSRC";
   32 #endif
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/10.2/sys/rpc/svc_auth_unix.c 261046 2014-01-22 23:45:27Z mav $");
   35 
   36 /*
   37  * svc_auth_unix.c
   38  * Handles UNIX flavor authentication parameters on the service side of rpc.
   39  * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
   40  * _svcauth_unix does full blown unix style uid,gid+gids auth,
   41  * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
   42  * Note: the shorthand has been gutted for efficiency.
   43  *
   44  * Copyright (C) 1984, Sun Microsystems, Inc.
   45  */
   46 
   47 #include <sys/param.h>
   48 #include <sys/lock.h>
   49 #include <sys/mutex.h>
   50 #include <sys/systm.h>
   51 #include <sys/ucred.h>
   52 
   53 #include <rpc/rpc.h>
   54 
   55 #include <rpc/rpc_com.h>
   56 
   57 #define MAX_MACHINE_NAME        255
   58 #define NGRPS                   16
   59 
   60 /*
   61  * Unix longhand authenticator
   62  */
   63 enum auth_stat
   64 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
   65 {
   66         enum auth_stat stat;
   67         XDR xdrs;
   68         int32_t *buf;
   69         uint32_t time;
   70         struct xucred *xcr;
   71         u_int auth_len;
   72         size_t str_len, gid_len;
   73         u_int i;
   74 
   75         xcr = rqst->rq_clntcred;
   76         auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
   77         xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,
   78             XDR_DECODE);
   79         buf = XDR_INLINE(&xdrs, auth_len);
   80         if (buf != NULL) {
   81                 time = IXDR_GET_UINT32(buf);
   82                 str_len = (size_t)IXDR_GET_UINT32(buf);
   83                 if (str_len > MAX_MACHINE_NAME) {
   84                         stat = AUTH_BADCRED;
   85                         goto done;
   86                 }
   87                 str_len = RNDUP(str_len);
   88                 buf += str_len / sizeof (int32_t);
   89                 xcr->cr_uid = IXDR_GET_UINT32(buf);
   90                 xcr->cr_groups[0] = IXDR_GET_UINT32(buf);
   91                 gid_len = (size_t)IXDR_GET_UINT32(buf);
   92                 if (gid_len > NGRPS) {
   93                         stat = AUTH_BADCRED;
   94                         goto done;
   95                 }
   96                 for (i = 0; i < gid_len; i++) {
   97                         if (i + 1 < XU_NGROUPS)
   98                                 xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf);
   99                         else
  100                                 buf++;
  101                 }
  102                 if (gid_len + 1 > XU_NGROUPS)
  103                         xcr->cr_ngroups = XU_NGROUPS;
  104                 else
  105                         xcr->cr_ngroups = gid_len + 1;
  106 
  107                 /*
  108                  * five is the smallest unix credentials structure -
  109                  * timestamp, hostname len (0), uid, gid, and gids len (0).
  110                  */
  111                 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
  112                         (void) printf("bad auth_len gid %ld str %ld auth %u\n",
  113                             (long)gid_len, (long)str_len, auth_len);
  114                         stat = AUTH_BADCRED;
  115                         goto done;
  116                 }
  117         } else if (! xdr_authunix_parms(&xdrs, &time, xcr)) {
  118                 stat = AUTH_BADCRED;
  119                 goto done;
  120         }
  121 
  122         rqst->rq_verf = _null_auth;
  123         stat = AUTH_OK;
  124 done:
  125         XDR_DESTROY(&xdrs);
  126 
  127         return (stat);
  128 }
  129 
  130 
  131 /*
  132  * Shorthand unix authenticator
  133  * Looks up longhand in a cache.
  134  */
  135 /*ARGSUSED*/
  136 enum auth_stat 
  137 _svcauth_short(rqst, msg)
  138         struct svc_req *rqst;
  139         struct rpc_msg *msg;
  140 {
  141         return (AUTH_REJECTEDCRED);
  142 }

Cache object: 9311a37490a36350efc74ebe303643da


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