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: stable/10/lib/libc/rpc/svc_auth_unix.c 309487 2016-12-03 17:27:28Z ngie $");
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 "namespace.h"
48 #include <assert.h>
49 #include <stdio.h>
50 #include <string.h>
51
52 #include <rpc/rpc.h>
53 #include "un-namespace.h"
54
55 /*
56 * Unix longhand authenticator
57 */
58 enum auth_stat
_svcauth_unix(struct svc_req * rqst,struct rpc_msg * msg)59 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
60 {
61 enum auth_stat stat;
62 XDR xdrs;
63 struct authunix_parms *aup;
64 int32_t *buf;
65 struct area {
66 struct authunix_parms area_aup;
67 char area_machname[MAX_MACHINE_NAME+1];
68 u_int area_gids[NGRPS];
69 } *area;
70 u_int auth_len;
71 size_t str_len, gid_len;
72 u_int i;
73
74 assert(rqst != NULL);
75 assert(msg != NULL);
76
77 area = (struct area *) rqst->rq_clntcred;
78 aup = &area->area_aup;
79 aup->aup_machname = area->area_machname;
80 aup->aup_gids = area->area_gids;
81 auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
82 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
83 buf = XDR_INLINE(&xdrs, auth_len);
84 if (buf != NULL) {
85 aup->aup_time = IXDR_GET_INT32(buf);
86 str_len = (size_t)IXDR_GET_U_INT32(buf);
87 if (str_len > MAX_MACHINE_NAME) {
88 stat = AUTH_BADCRED;
89 goto done;
90 }
91 memmove(aup->aup_machname, buf, str_len);
92 aup->aup_machname[str_len] = 0;
93 str_len = RNDUP(str_len);
94 buf += str_len / sizeof (int32_t);
95 aup->aup_uid = (int)IXDR_GET_INT32(buf);
96 aup->aup_gid = (int)IXDR_GET_INT32(buf);
97 gid_len = (size_t)IXDR_GET_U_INT32(buf);
98 if (gid_len > NGRPS) {
99 stat = AUTH_BADCRED;
100 goto done;
101 }
102 aup->aup_len = gid_len;
103 for (i = 0; i < gid_len; i++) {
104 aup->aup_gids[i] = (int)IXDR_GET_INT32(buf);
105 }
106 /*
107 * five is the smallest unix credentials structure -
108 * timestamp, hostname len (0), uid, gid, and gids len (0).
109 */
110 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
111 (void) printf("bad auth_len gid %ld str %ld auth %u\n",
112 (long)gid_len, (long)str_len, auth_len);
113 stat = AUTH_BADCRED;
114 goto done;
115 }
116 } else if (! xdr_authunix_parms(&xdrs, aup)) {
117 xdrs.x_op = XDR_FREE;
118 (void)xdr_authunix_parms(&xdrs, aup);
119 stat = AUTH_BADCRED;
120 goto done;
121 }
122
123 /* get the verifier */
124 if ((u_int)msg->rm_call.cb_verf.oa_length) {
125 rqst->rq_xprt->xp_verf.oa_flavor =
126 msg->rm_call.cb_verf.oa_flavor;
127 rqst->rq_xprt->xp_verf.oa_base =
128 msg->rm_call.cb_verf.oa_base;
129 rqst->rq_xprt->xp_verf.oa_length =
130 msg->rm_call.cb_verf.oa_length;
131 } else {
132 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
133 rqst->rq_xprt->xp_verf.oa_length = 0;
134 }
135 stat = AUTH_OK;
136 done:
137 XDR_DESTROY(&xdrs);
138 return (stat);
139 }
140
141
142 /*
143 * Shorthand unix authenticator
144 * Looks up longhand in a cache.
145 */
146 /*ARGSUSED*/
147 enum auth_stat
_svcauth_short(struct svc_req * rqst,struct rpc_msg * msg)148 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
149 {
150 return (AUTH_REJECTEDCRED);
151 }
152