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28f540f4 RM |
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 | * | |
a7ab6ec8 UD |
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. | |
28f540f4 RM |
37 | */ |
38 | ||
39 | #include <stdio.h> | |
e7fd8a39 | 40 | #include <string.h> |
28f540f4 | 41 | #include <rpc/rpc.h> |
e7fd8a39 | 42 | #include <rpc/svc.h> |
28f540f4 RM |
43 | |
44 | /* | |
45 | * Unix longhand authenticator | |
46 | */ | |
47 | enum auth_stat | |
e7fd8a39 | 48 | _svcauth_unix (struct svc_req *rqst, struct rpc_msg *msg) |
28f540f4 | 49 | { |
e7fd8a39 UD |
50 | enum auth_stat stat; |
51 | XDR xdrs; | |
52 | struct authunix_parms *aup; | |
f8afba91 | 53 | int32_t *buf; |
e7fd8a39 UD |
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; | |
28f540f4 | 64 | |
e7fd8a39 UD |
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; | |
7b57bfe5 | 70 | xdrmem_create (&xdrs, msg->rm_call.cb_cred.oa_base, auth_len, XDR_DECODE); |
e7fd8a39 UD |
71 | buf = XDR_INLINE (&xdrs, auth_len); |
72 | if (buf != NULL) | |
73 | { | |
74 | aup->aup_time = IXDR_GET_LONG (buf); | |
f8afba91 | 75 | str_len = IXDR_GET_U_INT32 (buf); |
e7fd8a39 UD |
76 | if (str_len > MAX_MACHINE_NAME) |
77 | { | |
78 | stat = AUTH_BADCRED; | |
79 | goto done; | |
28f540f4 | 80 | } |
9af652f6 | 81 | memcpy (aup->aup_machname, (caddr_t) buf, (u_int) str_len); |
e7fd8a39 UD |
82 | aup->aup_machname[str_len] = 0; |
83 | str_len = RNDUP (str_len); | |
f8afba91 | 84 | buf = (int32_t *) ((char *) buf + str_len); |
e7fd8a39 UD |
85 | aup->aup_uid = IXDR_GET_LONG (buf); |
86 | aup->aup_gid = IXDR_GET_LONG (buf); | |
f8afba91 | 87 | gid_len = IXDR_GET_U_INT32 (buf); |
e7fd8a39 UD |
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 | { | |
e7fd8a39 UD |
104 | stat = AUTH_BADCRED; |
105 | goto done; | |
106 | } | |
107 | } | |
7b57bfe5 | 108 | else if (!xdr_authunix_parms (&xdrs, aup)) |
e7fd8a39 UD |
109 | { |
110 | xdrs.x_op = XDR_FREE; | |
7b57bfe5 | 111 | (void) xdr_authunix_parms (&xdrs, aup); |
e7fd8a39 UD |
112 | stat = AUTH_BADCRED; |
113 | goto done; | |
114 | } | |
e852e889 UD |
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 | } | |
e7fd8a39 | 131 | stat = AUTH_OK; |
28f540f4 | 132 | done: |
e7fd8a39 UD |
133 | XDR_DESTROY (&xdrs); |
134 | return stat; | |
28f540f4 RM |
135 | } |
136 | ||
137 | ||
138 | /* | |
139 | * Shorthand unix authenticator | |
140 | * Looks up longhand in a cache. | |
141 | */ | |
e7fd8a39 | 142 | /*ARGSUSED */ |
7cc27f44 | 143 | enum auth_stat |
e7fd8a39 | 144 | _svcauth_short (struct svc_req *rqst, struct rpc_msg *msg) |
28f540f4 | 145 | { |
e7fd8a39 | 146 | return AUTH_REJECTEDCRED; |
28f540f4 | 147 | } |