usr/src/uts/common/rpc/sec/svc_authu.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1989 Sun Microsystems, Inc.  All rights reserved.
  24  * Copyright 2017 Joyent Inc
  25  * Use is subject to license terms.
  26  */
  27
  28 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
  29 /*        All Rights Reserved   */
  30
  31 /*
  32  * Portions of this source code were derived from Berkeley 4.3 BSD
  33  * under license from the Regents of the University of California.
  34  */
  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
  45 #include <sys/param.h>
  46 #include <sys/types.h>
  47 #include <sys/time.h>
  48 #include <sys/systm.h>
  49 #include <sys/stream.h>
  50 #include <sys/stropts.h>
  51 #include <sys/strsubr.h>
  52 #include <sys/tiuser.h>
  53 #include <sys/tihdr.h>
  54 #include <sys/t_kuser.h>
  55 #include <sys/cmn_err.h>
  56 #include <sys/debug.h>
  57
  58 #include <rpc/types.h>
  59 #include <rpc/xdr.h>
  60 #include <rpc/auth.h>
  61 #include <rpc/clnt.h>
  62 #include <rpc/rpc_msg.h>
  63 #include <rpc/svc.h>
  64 #include <rpc/auth_unix.h>
  65 #include <rpc/svc_auth.h>
  66
  67
  68 /*
  69  * Unix longhand authenticator
  70  */
  71 enum auth_stat
  72 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
  73 {
  74         struct authunix_parms *aup;
  75         int32_t *buf;
  76         struct area {
  77                 struct authunix_parms area_aup;
  78                 char area_machname[MAX_MACHINE_NAME+1];
  79                 gid_t area_gids[NGRPS];
  80         } *area;
  81         uint_t auth_len;
  82         uint_t str_len, gid_len;
  83         int i;
  84
  85         CTASSERT(sizeof (struct area) <= RQCRED_SIZE);
  86         /* LINTED pointer alignment */
  87         area = (struct area *)rqst->rq_clntcred;
  88         aup = &area->area_aup;
  89         aup->aup_machname = area->area_machname;
  90         aup->aup_gids = area->area_gids;
  91         auth_len = msg->rm_call.cb_cred.oa_length;
  92         if (auth_len == 0)
  93                 return (AUTH_BADCRED);
  94
  95         /* LINTED pointer cast */
  96         buf = (int32_t *)msg->rm_call.cb_cred.oa_base;
  97
  98         aup->aup_time = IXDR_GET_INT32(buf);
  99         str_len = IXDR_GET_U_INT32(buf);
 100         if (str_len > MAX_MACHINE_NAME)
 101                 return (AUTH_BADCRED);
 102         bcopy((caddr_t)buf, aup->aup_machname, str_len);
 103         aup->aup_machname[str_len] = 0;
 104         str_len = RNDUP(str_len);
 105         buf += str_len / sizeof (int32_t);
 106         aup->aup_uid = IXDR_GET_INT32(buf);
 107         aup->aup_gid = IXDR_GET_INT32(buf);
 108         gid_len = IXDR_GET_U_INT32(buf);
 109         if (gid_len > NGRPS)
 110                 return (AUTH_BADCRED);
 111         aup->aup_len = gid_len;
 112         for (i = 0; i < gid_len; i++) {
 113                 aup->aup_gids[i] = IXDR_GET_INT32(buf);
 114         }
 115         /*
 116          * five is the smallest unix credentials structure -
 117          * timestamp, hostname len (0), uid, gid, and gids len (0).
 118          */
 119         if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len)
 120                 return (AUTH_BADCRED);
 121
 122         rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
 123         rqst->rq_xprt->xp_verf.oa_length = 0;
 124
 125         return (AUTH_OK);
 126 }
 127
 128
 129 /*
 130  * Shorthand unix authenticator
 131  * Looks up longhand in a cache.
 132  */
 133 /* ARGSUSED */
 134 enum auth_stat
 135 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
 136 {
 137         return (AUTH_REJECTEDCRED);
 138 }