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 /*
32 * svc_auth_unix.c
33 * Handles UNIX flavor authentication parameters on the service side of rpc.
34 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
35 * _svcauth_unix does full blown unix style uid,gid+gids auth,
36 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
37 * Note: the shorthand has been gutted for efficiency.
38 *
39 * Copyright (C) 1984, Sun Microsystems, Inc.
40 */
41
42 #include "namespace.h"
43 #include <assert.h>
44 #include <stdio.h>
45 #include <string.h>
46
47 #include <rpc/rpc.h>
48 #include "un-namespace.h"
49
50 /*
51 * Unix longhand authenticator
52 */
53 enum auth_stat
_svcauth_unix(struct svc_req * rqst,struct rpc_msg * msg)54 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
55 {
56 enum auth_stat stat;
57 XDR xdrs;
58 struct authunix_parms *aup;
59 int32_t *buf;
60 struct area {
61 struct authunix_parms area_aup;
62 char area_machname[MAX_MACHINE_NAME+1];
63 u_int area_gids[NGRPS];
64 } *area;
65 u_int auth_len;
66 size_t str_len, gid_len;
67 u_int i;
68
69 assert(rqst != NULL);
70 assert(msg != NULL);
71
72 area = (struct area *) rqst->rq_clntcred;
73 aup = &area->area_aup;
74 aup->aup_machname = area->area_machname;
75 aup->aup_gids = area->area_gids;
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,XDR_DECODE);
78 buf = XDR_INLINE(&xdrs, auth_len);
79 if (buf != NULL) {
80 aup->aup_time = IXDR_GET_INT32(buf);
81 str_len = (size_t)IXDR_GET_U_INT32(buf);
82 if (str_len > MAX_MACHINE_NAME) {
83 stat = AUTH_BADCRED;
84 goto done;
85 }
86 memmove(aup->aup_machname, buf, str_len);
87 aup->aup_machname[str_len] = 0;
88 str_len = RNDUP(str_len);
89 buf += str_len / sizeof (int32_t);
90 aup->aup_uid = (int)IXDR_GET_INT32(buf);
91 aup->aup_gid = (int)IXDR_GET_INT32(buf);
92 gid_len = (size_t)IXDR_GET_U_INT32(buf);
93 if (gid_len > NGRPS) {
94 stat = AUTH_BADCRED;
95 goto done;
96 }
97 aup->aup_len = gid_len;
98 for (i = 0; i < gid_len; i++) {
99 aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
100 }
101 /*
102 * five is the smallest unix credentials structure -
103 * timestamp, hostname len (0), uid, gid, and gids len (0).
104 */
105 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
106 (void) printf("bad auth_len gid %ld str %ld auth %u\n",
107 (long)gid_len, (long)str_len, auth_len);
108 stat = AUTH_BADCRED;
109 goto done;
110 }
111 } else if (! xdr_authunix_parms(&xdrs, aup)) {
112 xdrs.x_op = XDR_FREE;
113 (void)xdr_authunix_parms(&xdrs, aup);
114 stat = AUTH_BADCRED;
115 goto done;
116 }
117
118 /* get the verifier */
119 if ((u_int)msg->rm_call.cb_verf.oa_length) {
120 rqst->rq_xprt->xp_verf.oa_flavor =
121 msg->rm_call.cb_verf.oa_flavor;
122 rqst->rq_xprt->xp_verf.oa_base =
123 msg->rm_call.cb_verf.oa_base;
124 rqst->rq_xprt->xp_verf.oa_length =
125 msg->rm_call.cb_verf.oa_length;
126 } else {
127 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
128 rqst->rq_xprt->xp_verf.oa_length = 0;
129 }
130 stat = AUTH_OK;
131 done:
132 XDR_DESTROY(&xdrs);
133 return (stat);
134 }
135
136
137 /*
138 * Shorthand unix authenticator
139 * Looks up longhand in a cache.
140 */
141 /*ARGSUSED*/
142 enum auth_stat
_svcauth_short(struct svc_req * rqst,struct rpc_msg * msg)143 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
144 {
145 return (AUTH_REJECTEDCRED);
146 }
147