1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2009, Sun Microsystems, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * - Redistributions of source code must retain the above copyright notice,
10 *   this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright notice,
12 *   this list of conditions and the following disclaimer in the documentation
13 *   and/or other materials provided with the distribution.
14 * - Neither the name of Sun Microsystems, Inc. nor the names of its
15 *   contributors may be used to endorse or promote products derived
16 *   from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#if defined(LIBC_SCCS) && !defined(lint)
32static char sccsid[] = "@(#)netnamer.c 1.13 91/03/11 Copyr 1986 Sun Micro";
33#endif
34#include <sys/cdefs.h>
35__FBSDID("$FreeBSD$");
36
37/*
38 * netname utility routines convert from unix names to network names and
39 * vice-versa This module is operating system dependent! What we define here
40 * will work with any unix system that has adopted the sun NIS domain
41 * architecture.
42 */
43#include "namespace.h"
44#include <sys/param.h>
45#include <rpc/rpc.h>
46#include <rpc/rpc_com.h>
47#ifdef YP
48#include <rpcsvc/yp_prot.h>
49#include <rpcsvc/ypclnt.h>
50#endif
51#include <ctype.h>
52#include <stdio.h>
53#include <grp.h>
54#include <pwd.h>
55#include <string.h>
56#include <stdlib.h>
57#include <unistd.h>
58#include "un-namespace.h"
59
60static char    *OPSYS = "unix";
61#ifdef YP
62static char    *NETID = "netid.byname";
63#endif
64static char    *NETIDFILE = "/etc/netid";
65
66static int getnetid( char *, char * );
67static int _getgroups( char *, gid_t * );
68
69/*
70 * Convert network-name into unix credential
71 */
72int
73netname2user(char netname[MAXNETNAMELEN + 1], uid_t *uidp, gid_t *gidp,
74    int *gidlenp, gid_t *gidlist)
75{
76	char           *p;
77	int             gidlen;
78	uid_t           uid;
79	long		luid;
80	struct passwd  *pwd;
81	char            val[1024];
82	char           *val1, *val2;
83	char           *domain;
84	int             vallen;
85	int             err;
86
87	if (getnetid(netname, val)) {
88		char *res = val;
89
90		p = strsep(&res, ":");
91		if (p == NULL)
92			return (0);
93		*uidp = (uid_t) atol(p);
94		p = strsep(&res, "\n,");
95		if (p == NULL) {
96			return (0);
97		}
98		*gidp = (gid_t) atol(p);
99		for (gidlen = 0; gidlen < NGRPS; gidlen++) {
100			p = strsep(&res, "\n,");
101			if (p == NULL)
102				break;
103			gidlist[gidlen] = (gid_t) atol(p);
104		}
105		*gidlenp = gidlen;
106
107		return (1);
108	}
109	val1 = strchr(netname, '.');
110	if (val1 == NULL)
111		return (0);
112	if (strncmp(netname, OPSYS, (val1-netname)))
113		return (0);
114	val1++;
115	val2 = strchr(val1, '@');
116	if (val2 == NULL)
117		return (0);
118	vallen = val2 - val1;
119	if (vallen > (1024 - 1))
120		vallen = 1024 - 1;
121	(void) strncpy(val, val1, 1024);
122	val[vallen] = 0;
123
124	err = __rpc_get_default_domain(&domain);	/* change to rpc */
125	if (err)
126		return (0);
127
128	if (strcmp(val2 + 1, domain))
129		return (0);	/* wrong domain */
130
131	if (sscanf(val, "%ld", &luid) != 1)
132		return (0);
133	uid = luid;
134
135	/* use initgroups method */
136	pwd = getpwuid(uid);
137	if (pwd == NULL)
138		return (0);
139	*uidp = pwd->pw_uid;
140	*gidp = pwd->pw_gid;
141	*gidlenp = _getgroups(pwd->pw_name, gidlist);
142	return (1);
143}
144
145/*
146 * initgroups
147 */
148
149static int
150_getgroups(char *uname, gid_t groups[NGRPS])
151{
152	gid_t           ngroups = 0;
153	struct group *grp;
154	int    i;
155	int    j;
156	int             filter;
157
158	setgrent();
159	while ((grp = getgrent())) {
160		for (i = 0; grp->gr_mem[i]; i++)
161			if (!strcmp(grp->gr_mem[i], uname)) {
162				if (ngroups == NGRPS) {
163#ifdef DEBUG
164					fprintf(stderr,
165				"initgroups: %s is in too many groups\n", uname);
166#endif
167					goto toomany;
168				}
169				/* filter out duplicate group entries */
170				filter = 0;
171				for (j = 0; j < ngroups; j++)
172					if (groups[j] == grp->gr_gid) {
173						filter++;
174						break;
175					}
176				if (!filter)
177					groups[ngroups++] = grp->gr_gid;
178			}
179	}
180toomany:
181	endgrent();
182	return (ngroups);
183}
184
185/*
186 * Convert network-name to hostname
187 */
188int
189netname2host(char netname[MAXNETNAMELEN + 1], char *hostname, int hostlen)
190{
191	int             err;
192	char            valbuf[1024];
193	char           *val;
194	char           *val2;
195	int             vallen;
196	char           *domain;
197
198	if (getnetid(netname, valbuf)) {
199		val = valbuf;
200		if ((*val == '0') && (val[1] == ':')) {
201			(void) strncpy(hostname, val + 2, hostlen);
202			return (1);
203		}
204	}
205	val = strchr(netname, '.');
206	if (val == NULL)
207		return (0);
208	if (strncmp(netname, OPSYS, (val - netname)))
209		return (0);
210	val++;
211	val2 = strchr(val, '@');
212	if (val2 == NULL)
213		return (0);
214	vallen = val2 - val;
215	if (vallen > (hostlen - 1))
216		vallen = hostlen - 1;
217	(void) strncpy(hostname, val, vallen);
218	hostname[vallen] = 0;
219
220	err = __rpc_get_default_domain(&domain);	/* change to rpc */
221	if (err)
222		return (0);
223
224	if (strcmp(val2 + 1, domain))
225		return (0);	/* wrong domain */
226	else
227		return (1);
228}
229
230/*
231 * reads the file /etc/netid looking for a + to optionally go to the
232 * network information service.
233 */
234int
235getnetid(char *key, char *ret)
236{
237	char            buf[1024];	/* big enough */
238	char           *res;
239	char           *mkey;
240	char           *mval;
241	FILE           *fd;
242#ifdef YP
243	char           *domain;
244	int             err;
245	char           *lookup;
246	int             len;
247#endif
248	int rv;
249
250	rv = 0;
251
252	fd = fopen(NETIDFILE, "r");
253	if (fd == NULL) {
254#ifdef YP
255		res = "+";
256		goto getnetidyp;
257#else
258		return (0);
259#endif
260	}
261	while (fd != NULL) {
262		res = fgets(buf, sizeof(buf), fd);
263		if (res == NULL) {
264			rv = 0;
265			goto done;
266		}
267		if (res[0] == '#')
268			continue;
269		else if (res[0] == '+') {
270#ifdef YP
271	getnetidyp:
272			err = yp_get_default_domain(&domain);
273			if (err) {
274				continue;
275			}
276			lookup = NULL;
277			err = yp_match(domain, NETID, key,
278				strlen(key), &lookup, &len);
279			if (err) {
280#ifdef DEBUG
281				fprintf(stderr, "match failed error %d\n", err);
282#endif
283				continue;
284			}
285			lookup[len] = 0;
286			strcpy(ret, lookup);
287			free(lookup);
288			rv = 2;
289			goto done;
290#else	/* YP */
291#ifdef DEBUG
292			fprintf(stderr,
293"Bad record in %s '+' -- NIS not supported in this library copy\n",
294				NETIDFILE);
295#endif
296			continue;
297#endif	/* YP */
298		} else {
299			mkey = strsep(&res, "\t ");
300			if (mkey == NULL) {
301				fprintf(stderr,
302		"Bad record in %s -- %s", NETIDFILE, buf);
303				continue;
304			}
305			do {
306				mval = strsep(&res, " \t#\n");
307			} while (mval != NULL && !*mval);
308			if (mval == NULL) {
309				fprintf(stderr,
310		"Bad record in %s val problem - %s", NETIDFILE, buf);
311				continue;
312			}
313			if (strcmp(mkey, key) == 0) {
314				strcpy(ret, mval);
315				rv = 1;
316				goto done;
317			}
318		}
319	}
320
321done:
322	if (fd != NULL)
323		fclose(fd);
324	return (rv);
325}
326