1 /* $OpenBSD: svc_auth_unix.c,v 1.13 2015/11/01 03:45:29 guenther Exp $ */
2
3 /*
4 * Copyright (c) 2010, Oracle America, Inc.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are
8 * met:
9 *
10 * * Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * * Redistributions in binary form must reproduce the above
13 * copyright notice, this list of conditions and the following
14 * disclaimer in the documentation and/or other materials
15 * provided with the distribution.
16 * * Neither the name of the "Oracle America, Inc." nor the names of its
17 * contributors may be used to endorse or promote products derived
18 * from this software without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34 /*
35 * svc_auth_unix.c
36 * Handles UNIX flavor authentication parameters on the service side of rpc.
37 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
38 * _svcauth_unix does full blown unix style uid,gid+gids auth,
39 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
40 * Note: the shorthand has been gutted for efficiency.
41 */
42
43 #include <stdio.h>
44 #include <rpc/rpc.h>
45 #include <string.h>
46
47 /*
48 * Unix longhand authenticator
49 */
50 enum auth_stat
_svcauth_unix(struct svc_req * rqst,struct rpc_msg * msg)51 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
52 {
53 enum auth_stat stat;
54 XDR xdrs;
55 struct authunix_parms *aup;
56 int32_t *buf;
57 struct area {
58 struct authunix_parms area_aup;
59 char area_machname[MAX_MACHINE_NAME+1];
60 int area_gids[NGRPS];
61 } *area;
62 u_int auth_len;
63 u_int str_len, gid_len;
64 u_int i;
65
66 area = (struct area *) rqst->rq_clntcred;
67 aup = &area->area_aup;
68 aup->aup_machname = area->area_machname;
69 aup->aup_gids = area->area_gids;
70 auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
71 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE);
72 buf = XDR_INLINE(&xdrs, auth_len);
73 if (buf != NULL) {
74 aup->aup_time = IXDR_GET_LONG(buf);
75 str_len = IXDR_GET_U_LONG(buf);
76 if (str_len > MAX_MACHINE_NAME) {
77 stat = AUTH_BADCRED;
78 goto done;
79 }
80 memcpy(aup->aup_machname, (caddr_t)buf, (u_int)str_len);
81 aup->aup_machname[str_len] = 0;
82 str_len = RNDUP(str_len);
83 buf += str_len / sizeof (int32_t);
84 aup->aup_uid = IXDR_GET_LONG(buf);
85 aup->aup_gid = IXDR_GET_LONG(buf);
86 gid_len = IXDR_GET_U_LONG(buf);
87 if (gid_len > NGRPS) {
88 stat = AUTH_BADCRED;
89 goto done;
90 }
91 aup->aup_len = gid_len;
92 for (i = 0; i < gid_len; i++) {
93 aup->aup_gids[i] = IXDR_GET_LONG(buf);
94 }
95 /*
96 * five is the smallest unix credentials structure -
97 * timestamp, hostname len (0), uid, gid, and gids len (0).
98 */
99 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
100 stat = AUTH_BADCRED;
101 goto done;
102 }
103 } else if (! xdr_authunix_parms(&xdrs, aup)) {
104 xdrs.x_op = XDR_FREE;
105 (void)xdr_authunix_parms(&xdrs, aup);
106 stat = AUTH_BADCRED;
107 goto done;
108 }
109 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
110 rqst->rq_xprt->xp_verf.oa_length = 0;
111 stat = AUTH_OK;
112 done:
113 XDR_DESTROY(&xdrs);
114 return (stat);
115 }
116 DEF_STRONG(_svcauth_unix);
117
118
119 /*
120 * Shorthand unix authenticator
121 * Looks up longhand in a cache.
122 */
123 enum auth_stat
_svcauth_short(struct svc_req * rqst,struct rpc_msg * msg)124 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg)
125 {
126 return (AUTH_REJECTEDCRED);
127 }
128 DEF_STRONG(_svcauth_short);
129