getspent.c revision 2830:5228d1267a01 
1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21/*
22 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
23 * Use is subject to license terms.
24 */
25/*
26 *	getspent.c
27 *
28 * lib/nsswitch/compat/getspent.c -- name-service-switch backend for getspnam()
29 *   It looks in /etc/shadow; if it finds shadow entries there that begin
30 *   with "+" or "-", it consults other services.  By default it uses NIS (YP),
31 *   but the user can override this with a "passwd_compat" entry in
32 *   /etc/nsswitch.conf, e.g.
33 *			passwd_compat: nisplus
34 * The main criterion for this code is that it behave in the same way as
35 * the code for getpwnam() and friends (in getpwent.c).  Note that it uses
36 * the same nsswitch.conf entry, not a separate entry for "shadow_compat".
37 *
38 * Caveats:
39 *    -	More than one source may be specified, with the usual switch semantics,
40 *	but having multiple sources here is definitely odd.
41 *    -	People who recursively specify "compat" deserve what they get.
42 *    -	Entries that begin with "+@" or "-@" are interpreted using
43 *	getnetgrent() and innetgr(), which use the "netgroup" entry in
44 *	/etc/nsswitch.conf.  If the sources for "passwd_compat" and "netgroup"
45 *	differ, everything should work fine, but the semantics will be pretty
46 *	confusing.
47 */
48
49#pragma ident	"%Z%%M%	%I%	%E% SMI"
50
51#include <shadow.h>
52#include <string.h>
53#include <stdlib.h>
54#include "compat_common.h"
55
56static DEFINE_NSS_DB_ROOT(db_root);
57
58static void
59_nss_initf_shadow_compat(p)
60	nss_db_params_t	*p;
61{
62	p->name		  = NSS_DBNAM_SHADOW;
63	p->config_name	  = NSS_DBNAM_PASSWD_COMPAT;
64	p->default_config = NSS_DEFCONF_PASSWD_COMPAT;
65}
66
67static const char *
68get_spnamp(argp)
69	nss_XbyY_args_t		*argp;
70{
71	struct spwd		*s = (struct spwd *)argp->returnval;
72
73	return (s->sp_namp);
74}
75
76static int
77check_spnamp(argp)
78	nss_XbyY_args_t		*argp;
79{
80	struct spwd		*s = (struct spwd *)argp->returnval;
81
82	return (strcmp(s->sp_namp, argp->key.name) == 0);
83}
84
85static nss_status_t
86getbyname(be, a)
87	compat_backend_ptr_t	be;
88	void			*a;
89{
90	nss_XbyY_args_t		*argp = (nss_XbyY_args_t *)a;
91
92	return (_nss_compat_XY_all(be, argp, check_spnamp,
93				NSS_DBOP_SHADOW_BYNAME));
94}
95
96/*ARGSUSED*/
97static int
98merge_spents(be, argp, fields)
99	compat_backend_ptr_t	be;
100	nss_XbyY_args_t		*argp;
101	const char		**fields;
102{
103	struct spwd		*sp	= (struct spwd *)argp->buf.result;
104
105	/*
106	 * Don't allow overriding of the username;  apart from that,
107	 *   anything is fair game.
108	 */
109
110	if (fields[1] != 0) {
111		size_t	namelen = strlen(sp->sp_namp) + 1;
112		size_t	passlen = strlen(fields[1])   + 1;
113
114		/* ===> Probably merits an explanation... */
115		if (namelen + passlen > argp->buf.buflen) {
116			return (NSS_STR_PARSE_ERANGE);
117		}
118		if (sp->sp_namp != argp->buf.buffer) {
119			(void) memmove(argp->buf.buffer,
120				sp->sp_namp, namelen);
121			sp->sp_namp = argp->buf.buffer;
122		}
123		(void) memcpy(argp->buf.buffer + namelen,
124			fields[1], passlen);
125	}
126
127#define	override(field, longp)				\
128	if ((field) != 0) {				\
129		char	*end;				\
130		long	val = strtol(field, &end, 10);	\
131							\
132		if (*end == '\0') {			\
133			*(longp) = val;			\
134		} else {				\
135			return (NSS_STR_PARSE_PARSE);	\
136		}					\
137	}
138
139	/* do not override last changed date, it never gets reset. */
140	/* override(fields[2], &sp->sp_lstchg); */
141	override(fields[3], &sp->sp_min);
142	override(fields[4], &sp->sp_max);
143	override(fields[5], &sp->sp_warn);
144	override(fields[6], &sp->sp_inact);
145	override(fields[7], &sp->sp_expire);
146	override(fields[8], &sp->sp_flag);
147
148	/*
149	 * if asked, return the data in /etc file format
150	 */
151	if (be->return_string_data == 1) {
152		int	n;
153		char	b[16];
154
155		/* reset the result ptr to the original value */
156		argp->buf.result = NULL;
157
158#define	printnum(num)	sprintf(b, "%d", num)) ? b : ""
159
160		n = snprintf(argp->buf.buffer, argp->buf.buflen,
161			"%s:%s:%s:%s:%s:%s:%s:%s:%s", sp->sp_namp,
162			(sp->sp_pwdp ? sp->sp_pwdp : ""),
163			(sp->sp_lstchg >= 0 && printnum(sp->sp_lstchg),
164			(sp->sp_min >= 0 && printnum(sp->sp_min),
165			(sp->sp_max >= 0 && printnum(sp->sp_max),
166			(sp->sp_warn > 0 && printnum(sp->sp_warn),
167			(sp->sp_inact > 0 && printnum(sp->sp_inact),
168			(sp->sp_expire > 0 && printnum(sp->sp_expire),
169			(sp->sp_flag != 0 && printnum(sp->sp_flag));
170
171		if (n > argp->buf.buflen)
172			return (NSS_STR_PARSE_ERANGE);
173		else {
174			argp->returnlen = n - 1;
175			return (NSS_SUCCESS);
176		}
177
178	} else
179		return (NSS_STR_PARSE_SUCCESS);
180}
181
182static compat_backend_op_t shadow_ops[] = {
183	_nss_compat_destr,
184	_nss_compat_endent,
185	_nss_compat_setent,
186	_nss_compat_getent,
187	getbyname
188};
189
190/*ARGSUSED*/
191nss_backend_t *
192_nss_compat_shadow_constr(dummy1, dummy2, dummy3)
193	const char	*dummy1, *dummy2, *dummy3;
194{
195	return (_nss_compat_constr(shadow_ops,
196				sizeof (shadow_ops) / sizeof (shadow_ops[0]),
197				SHADOW,
198				NSS_LINELEN_SHADOW,
199				&db_root,
200				_nss_initf_shadow_compat,
201				1,
202				get_spnamp,
203				merge_spents));
204}
205