1 /*
2 * svc_auth_unix.c
3 * Handles UNIX flavor authentication parameters on the service side of rpc.
4 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
5 * _svcauth_unix does full blown unix style uid,gid+gids auth,
6 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
7 * Note: the shorthand has been gutted for efficiency.
8 *
9 * Copyright (c) 2010, Oracle America, Inc.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions are
13 * met:
14 *
15 * * Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * * Redistributions in binary form must reproduce the above
18 * copyright notice, this list of conditions and the following
19 * disclaimer in the documentation and/or other materials
20 * provided with the distribution.
21 * * Neither the name of the "Oracle America, Inc." nor the names of its
22 * contributors may be used to endorse or promote products derived
23 * from this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
28 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
29 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
30 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
32 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
34 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
36 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37 */
38
39 #include <stdio.h>
40 #include <string.h>
41 #include <rpc/rpc.h>
42 #include <rpc/svc.h>
43
44 /*
45 * Unix longhand authenticator
46 */
47 enum auth_stat
48 _svcauth_unix (struct svc_req *rqst, struct rpc_msg *msg)
49 {
50 enum auth_stat stat;
51 XDR xdrs;
52 struct authunix_parms *aup;
53 int32_t *buf;
54 struct area
55 {
56 struct authunix_parms area_aup;
57 char area_machname[MAX_MACHINE_NAME + 1];
58 gid_t area_gids[NGRPS];
59 }
60 *area;
61 u_int auth_len;
62 u_int str_len, gid_len;
63 u_int i;
64
65 area = (struct area *) rqst->rq_clntcred;
66 aup = &area->area_aup;
67 aup->aup_machname = area->area_machname;
68 aup->aup_gids = area->area_gids;
69 auth_len = (u_int) msg->rm_call.cb_cred.oa_length;
70 xdrmem_create (&xdrs, msg->rm_call.cb_cred.oa_base, auth_len, XDR_DECODE);
71 buf = XDR_INLINE (&xdrs, auth_len);
72 if (buf != NULL)
73 {
74 aup->aup_time = IXDR_GET_LONG (buf);
75 str_len = IXDR_GET_U_INT32 (buf);
76 if (str_len > MAX_MACHINE_NAME)
77 {
78 stat = AUTH_BADCRED;
79 goto done;
80 }
81 memcpy (aup->aup_machname, (caddr_t) buf, (u_int) str_len);
82 aup->aup_machname[str_len] = 0;
83 str_len = RNDUP (str_len);
84 buf = (int32_t *) ((char *) buf + str_len);
85 aup->aup_uid = IXDR_GET_LONG (buf);
86 aup->aup_gid = IXDR_GET_LONG (buf);
87 gid_len = IXDR_GET_U_INT32 (buf);
88 if (gid_len > NGRPS)
89 {
90 stat = AUTH_BADCRED;
91 goto done;
92 }
93 aup->aup_len = gid_len;
94 for (i = 0; i < gid_len; i++)
95 {
96 aup->aup_gids[i] = IXDR_GET_LONG (buf);
97 }
98 /*
99 * five is the smallest unix credentials structure -
100 * timestamp, hostname len (0), uid, gid, and gids len (0).
101 */
102 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len)
103 {
104 stat = AUTH_BADCRED;
105 goto done;
106 }
107 }
108 else if (!xdr_authunix_parms (&xdrs, aup))
109 {
110 xdrs.x_op = XDR_FREE;
111 (void) xdr_authunix_parms (&xdrs, aup);
112 stat = AUTH_BADCRED;
113 goto done;
114 }
115
116 /* get the verifier */
117 if ((u_int)msg->rm_call.cb_verf.oa_length)
118 {
119 rqst->rq_xprt->xp_verf.oa_flavor =
120 msg->rm_call.cb_verf.oa_flavor;
121 rqst->rq_xprt->xp_verf.oa_base =
122 msg->rm_call.cb_verf.oa_base;
123 rqst->rq_xprt->xp_verf.oa_length =
124 msg->rm_call.cb_verf.oa_length;
125 }
126 else
127 {
128 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL;
129 rqst->rq_xprt->xp_verf.oa_length = 0;
130 }
131 stat = AUTH_OK;
132 done:
133 XDR_DESTROY (&xdrs);
134 return stat;
135 }
136
137
138 /*
139 * Shorthand unix authenticator
140 * Looks up longhand in a cache.
141 */
142 /*ARGSUSED */
143 enum auth_stat
144 _svcauth_short (struct svc_req *rqst, struct rpc_msg *msg)
145 {
146 return AUTH_REJECTEDCRED;
147 }