svc_auth_unix.c revision 184588 
1/*
2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
3 * unrestricted use provided that this legend is included on all tape
4 * media and as a part of the software program in whole or part.  Users
5 * may copy or modify Sun RPC without charge, but are not authorized
6 * to license or distribute it to anyone else except as part of a product or
7 * program developed by the user.
8 *
9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
12 *
13 * Sun RPC is provided with no support and without any obligation on the
14 * part of Sun Microsystems, Inc. to assist in its use, correction,
15 * modification or enhancement.
16 *
17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
19 * OR ANY PART THEREOF.
20 *
21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue
22 * or profits or other special, indirect and consequential damages, even if
23 * Sun has been advised of the possibility of such damages.
24 *
25 * Sun Microsystems, Inc.
26 * 2550 Garcia Avenue
27 * Mountain View, California  94043
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro";
32static char *sccsid = "@(#)svc_auth_unix.c	2.3 88/08/01 4.0 RPCSRC";
33#endif
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD: head/sys/rpc/svc_auth_unix.c 184588 2008-11-03 10:38:00Z dfr $");
36
37/*
38 * svc_auth_unix.c
39 * Handles UNIX flavor authentication parameters on the service side of rpc.
40 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT.
41 * _svcauth_unix does full blown unix style uid,gid+gids auth,
42 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths.
43 * Note: the shorthand has been gutted for efficiency.
44 *
45 * Copyright (C) 1984, Sun Microsystems, Inc.
46 */
47
48#include <sys/param.h>
49#include <sys/lock.h>
50#include <sys/mutex.h>
51#include <sys/systm.h>
52#include <sys/ucred.h>
53
54#include <rpc/rpc.h>
55
56#include <rpc/rpc_com.h>
57
58#define MAX_MACHINE_NAME	255
59#define NGRPS			16
60
61/*
62 * Unix longhand authenticator
63 */
64enum auth_stat
65_svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg)
66{
67	enum auth_stat stat;
68	XDR xdrs;
69	int32_t *buf;
70	uint32_t time;
71	struct xucred *xcr;
72	u_int auth_len;
73	size_t str_len, gid_len;
74	u_int i;
75
76	xcr = rqst->rq_clntcred;
77	auth_len = (u_int)msg->rm_call.cb_cred.oa_length;
78	xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,
79	    XDR_DECODE);
80	buf = XDR_INLINE(&xdrs, auth_len);
81	if (buf != NULL) {
82		time = IXDR_GET_UINT32(buf);
83		str_len = (size_t)IXDR_GET_UINT32(buf);
84		if (str_len > MAX_MACHINE_NAME) {
85			stat = AUTH_BADCRED;
86			goto done;
87		}
88		str_len = RNDUP(str_len);
89		buf += str_len / sizeof (int32_t);
90		xcr->cr_uid = IXDR_GET_UINT32(buf);
91		xcr->cr_groups[0] = IXDR_GET_UINT32(buf);
92		gid_len = (size_t)IXDR_GET_UINT32(buf);
93		if (gid_len > NGRPS) {
94			stat = AUTH_BADCRED;
95			goto done;
96		}
97		for (i = 0; i < gid_len; i++) {
98			if (i + 1 < NGROUPS)
99				xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf);
100			else
101				buf++;
102		}
103		if (gid_len + 1 > NGROUPS)
104			xcr->cr_ngroups = NGROUPS;
105		else
106			xcr->cr_ngroups = gid_len + 1;
107
108		/*
109		 * five is the smallest unix credentials structure -
110		 * timestamp, hostname len (0), uid, gid, and gids len (0).
111		 */
112		if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) {
113			(void) printf("bad auth_len gid %ld str %ld auth %u\n",
114			    (long)gid_len, (long)str_len, auth_len);
115			stat = AUTH_BADCRED;
116			goto done;
117		}
118	} else if (! xdr_authunix_parms(&xdrs, &time, xcr)) {
119		stat = AUTH_BADCRED;
120		goto done;
121	}
122
123	rqst->rq_verf = _null_auth;
124	stat = AUTH_OK;
125done:
126	XDR_DESTROY(&xdrs);
127
128	return (stat);
129}
130
131
132/*
133 * Shorthand unix authenticator
134 * Looks up longhand in a cache.
135 */
136/*ARGSUSED*/
137enum auth_stat
138_svcauth_short(rqst, msg)
139	struct svc_req *rqst;
140	struct rpc_msg *msg;
141{
142	return (AUTH_REJECTEDCRED);
143}
144