1 /*
2 * Copyright (c) 1997-2014 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 *
36 * File: am-utils/libamu/misc_rpc.c
37 *
38 */
39
40 /*
41 * Additions to Sun RPC.
42 */
43
44 #ifdef HAVE_CONFIG_H
45 # include <config.h>
46 #endif /* HAVE_CONFIG_H */
47 #include <am_defs.h>
48 #include <amu.h>
49
50 /*
51 * Some systems renamed _seterr_reply to __seterr_reply (with two
52 * leading underscores)
53 */
54 #if !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY)
55 # define _seterr_reply __seterr_reply
56 #endif /* !defined(HAVE__SETERR_REPLY) && defined(HAVE___SETERR_REPLY) */
57
58
59 void
rpc_msg_init(struct rpc_msg * mp,u_long prog,u_long vers,u_long proc)60 rpc_msg_init(struct rpc_msg *mp, u_long prog, u_long vers, u_long proc)
61 {
62 /*
63 * Initialize the message
64 */
65 memset((voidp) mp, 0, sizeof(*mp));
66 mp->rm_xid = 0;
67 mp->rm_direction = CALL;
68 mp->rm_call.cb_rpcvers = RPC_MSG_VERSION;
69 mp->rm_call.cb_prog = prog;
70 mp->rm_call.cb_vers = vers;
71 mp->rm_call.cb_proc = proc;
72 }
73
74
75 /*
76 * Field reply to call to mountd
77 */
78 int
pickup_rpc_reply(voidp pkt,int len,voidp where,XDRPROC_T_TYPE where_xdr)79 pickup_rpc_reply(voidp pkt, int len, voidp where, XDRPROC_T_TYPE where_xdr)
80 {
81 XDR reply_xdr;
82 int ok;
83 struct rpc_err err;
84 struct rpc_msg reply_msg;
85 int error = 0;
86
87 /* memset((voidp) &err, 0, sizeof(err)); */
88 memset((voidp) &reply_msg, 0, sizeof(reply_msg));
89 memset((voidp) &reply_xdr, 0, sizeof(reply_xdr));
90
91 reply_msg.acpted_rply.ar_results.where = where;
92 reply_msg.acpted_rply.ar_results.proc = where_xdr;
93
94 xdrmem_create(&reply_xdr, pkt, len, XDR_DECODE);
95
96 ok = xdr_replymsg(&reply_xdr, &reply_msg);
97 if (!ok) {
98 error = EIO;
99 goto drop;
100 }
101 _seterr_reply(&reply_msg, &err);
102 if (err.re_status != RPC_SUCCESS) {
103 error = EIO;
104 goto drop;
105 }
106
107 drop:
108 if (reply_msg.rm_reply.rp_stat == MSG_ACCEPTED &&
109 reply_msg.acpted_rply.ar_verf.oa_base) {
110 reply_xdr.x_op = XDR_FREE;
111 (void) xdr_opaque_auth(&reply_xdr,
112 &reply_msg.acpted_rply.ar_verf);
113 }
114 xdr_destroy(&reply_xdr);
115
116 return error;
117 }
118
119
120 int
make_rpc_packet(char * buf,int buflen,u_long proc,struct rpc_msg * mp,voidp arg,XDRPROC_T_TYPE arg_xdr,AUTH * auth)121 make_rpc_packet(char *buf, int buflen, u_long proc, struct rpc_msg *mp, voidp arg, XDRPROC_T_TYPE arg_xdr, AUTH *auth)
122 {
123 XDR msg_xdr;
124 int len;
125 /*
126 * Never cast pointers between different integer types, it breaks badly
127 * on big-endian platforms if those types have different sizes.
128 *
129 * Cast to a local variable instead, and use that variable's address.
130 */
131 enum_t local_proc = (enum_t) proc;
132
133 xdrmem_create(&msg_xdr, buf, buflen, XDR_ENCODE);
134
135 /*
136 * Basic protocol header
137 */
138 if (!xdr_callhdr(&msg_xdr, mp))
139 return -EIO;
140
141 /*
142 * Called procedure number
143 */
144 if (!xdr_enum(&msg_xdr, &local_proc))
145 return -EIO;
146
147 /*
148 * Authorization
149 */
150 if (!AUTH_MARSHALL(auth, &msg_xdr))
151 return -EIO;
152
153 /*
154 * Arguments
155 */
156 if (!(*arg_xdr) (&msg_xdr, arg))
157 return -EIO;
158
159 /*
160 * Determine length
161 */
162 len = xdr_getpos(&msg_xdr);
163
164 /*
165 * Throw away xdr
166 */
167 xdr_destroy(&msg_xdr);
168
169 return len;
170 }
171
172
173 /* get uid/gid from RPC credentials */
174 int
getcreds(struct svc_req * rp,uid_t * u,gid_t * g,SVCXPRT * nfsxprt)175 getcreds(struct svc_req *rp, uid_t *u, gid_t *g, SVCXPRT *nfsxprt)
176 {
177 struct authunix_parms *aup = (struct authunix_parms *) NULL;
178 #ifdef HAVE_RPC_AUTH_DES_H
179 struct authdes_cred *adp;
180 #endif /* HAVE_RPC_AUTH_DES_H */
181
182 switch (rp->rq_cred.oa_flavor) {
183
184 case AUTH_UNIX:
185 aup = (struct authunix_parms *) rp->rq_clntcred;
186 *u = aup->aup_uid;
187 *g = aup->aup_gid;
188 break;
189
190 #ifdef HAVE_RPC_AUTH_DES_H
191 case AUTH_DES:
192 adp = (struct authdes_cred *) rp->rq_clntcred;
193 *g = INVALIDID; /* some unknown group id */
194 if (sscanf(adp->adc_fullname.name, "unix.%lu@", (u_long *) u) == 1)
195 break;
196 /* fall through */
197 #endif /* HAVE_RPC_AUTH_DES_H */
198
199 default:
200 *u = *g = INVALIDID; /* just in case */
201 svcerr_weakauth(nfsxprt);
202 return -1;
203 }
204
205 return 0; /* everything is ok */
206 }
207