usr/src/lib/libc/port/nsl/svc_auth_sys.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 /*
  24  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  25  * Copyright 2017 Joyent Inc
  26  * Use is subject to license terms.
  27  */
  28
  29 /* Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T */
  30 /* All Rights Reserved */
  31 /*
  32  * Portions of this source code were derived from Berkeley
  33  * 4.3 BSD under license from the Regents of the University of
  34  * California.
  35  */
  36
  37 /*
  38  * Handles UNIX flavor authentication parameters on the service side of rpc.
  39  * There are two svc auth implementations here: AUTH_SYS and AUTH_SHORT.
  40  * __svcauth_sys does full blown unix style uid, gid+gids auth,
  41  * __svcauth_short uses a shorthand auth to index into a cache of
  42  *      longhand auths.
  43  * Note: the shorthand has been gutted for efficiency.
  44  *
  45  */
  46
  47 #include "mt.h"
  48 #include <stdio.h>
  49 #include <rpc/rpc.h>
  50 #include <syslog.h>
  51 #include <sys/types.h>
  52 #include <sys/debug.h>
  53 #include <string.h>
  54
  55 /*
  56  * NOTE: this has to fit inside RQCRED_SIZE bytes. If you update this struct,
  57  * double-check it still fits.
  58  */
  59 struct authsys_area {
  60         struct authsys_parms area_aup;
  61         char area_machname[MAX_MACHINE_NAME+1];
  62         gid_t area_gids[NGRPS];
  63 };
  64 CTASSERT(sizeof (struct authsys_area) <= RQCRED_SIZE);
  65
  66 /*
  67  * System (Unix) longhand authenticator
  68  */
  69 enum auth_stat
  70 __svcauth_sys(struct svc_req *rqst, struct rpc_msg *msg)
  71 {
  72         struct authsys_parms *aup;
  73         int32_t *buf;
  74         struct authsys_area *area;
  75         uint_t auth_len;
  76         uint_t str_len, gid_len;
  77         int i;
  78
  79         /* LINTED pointer cast */
  80         area = (struct authsys_area *)rqst->rq_clntcred;
  81         aup = &area->area_aup;
  82         aup->aup_machname = area->area_machname;
  83         aup->aup_gids = area->area_gids;
  84         auth_len = msg->rm_call.cb_cred.oa_length;
  85         if (auth_len == 0)
  86                 return (AUTH_BADCRED);
  87
  88         /* LINTED pointer cast */
  89         buf = (int32_t *)msg->rm_call.cb_cred.oa_base;
  90
  91         aup->aup_time = IXDR_GET_INT32(buf);
  92         str_len = IXDR_GET_U_INT32(buf);
  93         if (str_len > MAX_MACHINE_NAME)
  94                 return (AUTH_BADCRED);
  95         (void) memcpy(aup->aup_machname, buf, str_len);
  96         aup->aup_machname[str_len] = 0;
  97         str_len = RNDUP(str_len);
  98         buf += str_len / (int)sizeof (int32_t);
  99         aup->aup_uid = IXDR_GET_INT32(buf);
 100         aup->aup_gid = IXDR_GET_INT32(buf);
 101         gid_len = IXDR_GET_U_INT32(buf);
 102         if (gid_len > NGRPS)
 103                 return (AUTH_BADCRED);
 104         aup->aup_len = gid_len;
 105         for (i = 0; i < gid_len; i++) {
 106                 aup->aup_gids[i] = (gid_t)IXDR_GET_INT32(buf);
 107         }
 108         /*
 109          * five is the smallest unix credentials structure -
 110          * timestamp, hostname len (0), uid, gid, and gids len (0).
 111          */
 112         if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len)
 113                 return (AUTH_BADCRED);
 114
 115         rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
 116         rqst->rq_xprt->xp_verf.oa_length = 0;
 117
 118         return (AUTH_OK);
 119 }
 120
 121 /*
 122  * Shorthand unix authenticator
 123  * Looks up longhand in a cache.
 124  */
 125 /*ARGSUSED*/
 126 enum auth_stat
 127 __svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
 128 {
 129         return (AUTH_REJECTEDCRED);
 130 }
 131
 132 /*
 133  * Unix longhand authenticator. Will be obsoleted
 134  */
 135 enum auth_stat
 136 __svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
 137 {
 138         return (__svcauth_sys(rqst, msg));
 139 }