1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 * this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 * this list of conditions and the following disclaimer in the documentation
13 * and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31 #if defined(LIBC_SCCS) && !defined(lint)
32 static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
33 static char *sccsid = "@(#)svc_auth_unix.c 2.3 88/08/01 4.0 RPCSRC";
34 #endif
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD: releng/12.0/sys/rpc/svc_auth_unix.c 326023 2017-11-20 19:43:44Z pfg $");
37
38 /*
39 * svc_auth_unix.c
40 * Handles UNIX flavor authentication parameters on the service side of rpc.
41 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
42 * _svcauth_unix does full blown unix style uid,gid+gids auth,
43 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
44 * Note: the shorthand has been gutted for efficiency.
45 *
46 * Copyright (C) 1984, Sun Microsystems, Inc.
47 */
48
49 #include <sys/param.h>
50 #include <sys/lock.h>
51 #include <sys/mutex.h>
52 #include <sys/systm.h>
53 #include <sys/ucred.h>
54
55 #include <rpc/rpc.h>
56
57 #include <rpc/rpc_com.h>
58
59 #define MAX_MACHINE_NAME 255
60 #define NGRPS 16
61
62 /*
63 * Unix longhand authenticator
64 */
65 enum auth_stat
66 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
67 {
68 enum auth_stat stat;
69 XDR xdrs;
70 int32_t *buf;
71 uint32_t time;
72 struct xucred *xcr;
73 u_int auth_len;
74 size_t str_len, gid_len;
75 u_int i;
76
77 xcr = rqst->rq_clntcred;
78 auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
79 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,
80 XDR_DECODE);
81 buf = XDR_INLINE(&xdrs, auth_len);
82 if (buf != NULL) {
83 time = IXDR_GET_UINT32(buf);
84 str_len = (size_t)IXDR_GET_UINT32(buf);
85 if (str_len > MAX_MACHINE_NAME) {
86 stat = AUTH_BADCRED;
87 goto done;
88 }
89 str_len = RNDUP(str_len);
90 buf += str_len / sizeof (int32_t);
91 xcr->cr_uid = IXDR_GET_UINT32(buf);
92 xcr->cr_groups[0] = IXDR_GET_UINT32(buf);
93 gid_len = (size_t)IXDR_GET_UINT32(buf);
94 if (gid_len > NGRPS) {
95 stat = AUTH_BADCRED;
96 goto done;
97 }
98 for (i = 0; i < gid_len; i++) {
99 if (i + 1 < XU_NGROUPS)
100 xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf);
101 else
102 buf++;
103 }
104 if (gid_len + 1 > XU_NGROUPS)
105 xcr->cr_ngroups = XU_NGROUPS;
106 else
107 xcr->cr_ngroups = gid_len + 1;
108
109 /*
110 * five is the smallest unix credentials structure -
111 * timestamp, hostname len (0), uid, gid, and gids len (0).
112 */
113 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
114 (void) printf("bad auth_len gid %ld str %ld auth %u\n",
115 (long)gid_len, (long)str_len, auth_len);
116 stat = AUTH_BADCRED;
117 goto done;
118 }
119 } else if (! xdr_authunix_parms(&xdrs, &time, xcr)) {
120 stat = AUTH_BADCRED;
121 goto done;
122 }
123
124 rqst->rq_verf = _null_auth;
125 stat = AUTH_OK;
126 done:
127 XDR_DESTROY(&xdrs);
128
129 return (stat);
130 }
131
132
133 /*
134 * Shorthand unix authenticator
135 * Looks up longhand in a cache.
136 */
137 /*ARGSUSED*/
138 enum auth_stat
139 _svcauth_short(rqst, msg)
140 struct svc_req *rqst;
141 struct rpc_msg *msg;
142 {
143 return (AUTH_REJECTEDCRED);
144 }
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