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 | } |
148 | |