pw_group.c revision 285411 
1/*-
2 * Copyright (C) 1996
3 *	David L. Nugent.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#ifndef lint
28static const char rcsid[] =
29  "$FreeBSD: head/usr.sbin/pw/pw_group.c 285411 2015-07-11 22:35:07Z bapt $";
30#endif /* not lint */
31
32#include <ctype.h>
33#include <err.h>
34#include <termios.h>
35#include <stdbool.h>
36#include <unistd.h>
37#include <grp.h>
38#include <libutil.h>
39
40#include "pw.h"
41#include "bitmap.h"
42
43
44static struct passwd *lookup_pwent(const char *user);
45static void	delete_members(struct group *grp, char *list);
46static int	print_group(struct group * grp);
47static gid_t    gr_gidpolicy(struct userconf * cnf, long id);
48
49static void
50set_passwd(struct group *grp, bool update)
51{
52	int		 b;
53	int		 istty;
54	struct termios	 t, n;
55	char		*p, line[256];
56
57	if (conf.fd == '-') {
58		grp->gr_passwd = "*";	/* No access */
59		return;
60	}
61
62	if ((istty = isatty(conf.fd))) {
63		n = t;
64		/* Disable echo */
65		n.c_lflag &= ~(ECHO);
66		tcsetattr(conf.fd, TCSANOW, &n);
67		printf("%sassword for group %s:", update ? "New p" : "P",
68		    grp->gr_name);
69		fflush(stdout);
70	}
71	b = read(conf.fd, line, sizeof(line) - 1);
72	if (istty) {	/* Restore state */
73		tcsetattr(conf.fd, TCSANOW, &t);
74		fputc('\n', stdout);
75		fflush(stdout);
76	}
77	if (b < 0)
78		err(EX_OSERR, "-h file descriptor");
79	line[b] = '\0';
80	if ((p = strpbrk(line, " \t\r\n")) != NULL)
81		*p = '\0';
82	if (!*line)
83		errx(EX_DATAERR, "empty password read on file descriptor %d",
84		    conf.fd);
85	if (conf.precrypted) {
86		if (strchr(line, ':') != 0)
87			errx(EX_DATAERR, "wrong encrypted passwrd");
88		grp->gr_passwd = line;
89	} else
90		grp->gr_passwd = pw_pwcrypt(line);
91}
92
93int
94pw_groupnext(struct userconf *cnf, bool quiet)
95{
96	gid_t next = gr_gidpolicy(cnf, -1);
97
98	if (quiet)
99		return (next);
100	printf("%u\n", next);
101
102	return (EXIT_SUCCESS);
103}
104
105static int
106pw_groupshow(const char *name, long id, struct group *fakegroup)
107{
108	struct group *grp = NULL;
109
110	if (id < 0 && name == NULL && !conf.all)
111		errx(EX_DATAERR, "groupname or id or '-a' required");
112
113	if (conf.all) {
114		SETGRENT();
115		while ((grp = GETGRENT()) != NULL)
116			print_group(grp);
117		ENDGRENT();
118
119		return (EXIT_SUCCESS);
120	}
121
122	grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
123	if (grp == NULL) {
124		if (conf.force) {
125			grp = fakegroup;
126		} else {
127			if (name == NULL)
128				errx(EX_DATAERR, "unknown gid `%ld'", id);
129			errx(EX_DATAERR, "unknown group `%s'", name);
130		}
131	}
132
133	return (print_group(grp));
134}
135
136static int
137pw_groupdel(const char *name, long id)
138{
139	struct group *grp = NULL;
140	int rc;
141
142	grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
143	if (grp == NULL) {
144		if (name == NULL)
145			errx(EX_DATAERR, "unknown gid `%ld'", id);
146		errx(EX_DATAERR, "unknown group `%s'", name);
147	}
148
149	rc = delgrent(grp);
150	if (rc == -1)
151		err(EX_IOERR, "group '%s' not available (NIS?)", name);
152	else if (rc != 0)
153		err(EX_IOERR, "group update");
154	pw_log(conf.userconf, M_DELETE, W_GROUP, "%s(%ld) removed", name, id);
155
156	return (EXIT_SUCCESS);
157}
158
159int
160pw_group(int mode, char *name, long id, struct cargs * args)
161{
162	int		rc;
163	struct carg    *arg;
164	struct group   *grp = NULL;
165	char           **members = NULL;
166	struct userconf	*cnf = conf.userconf;
167
168	static struct group fakegroup =
169	{
170		"nogroup",
171		"*",
172		-1,
173		NULL
174	};
175
176	if (mode == M_NEXT)
177		return (pw_groupnext(cnf, conf.quiet));
178
179	if (mode == M_PRINT)
180		return (pw_groupshow(name, id, &fakegroup));
181
182	if (mode == M_DELETE)
183		return (pw_groupdel(name, id));
184
185	if (mode == M_LOCK || mode == M_UNLOCK)
186		errx(EX_USAGE, "'lock' command is not available for groups");
187
188	if (id < 0 && name == NULL)
189		errx(EX_DATAERR, "group name or id required");
190
191	grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
192
193	if (mode == M_UPDATE) {
194		if (name == NULL && grp == NULL)	/* Try harder */
195			grp = GETGRGID(id);
196
197		if (grp == NULL) {
198			if (name == NULL)
199				errx(EX_DATAERR, "unknown group `%s'", name);
200			else
201				errx(EX_DATAERR, "unknown group `%ld'", id);
202		}
203		if (name == NULL)	/* Needed later */
204			name = grp->gr_name;
205
206		if (id > 0)
207			grp->gr_gid = (gid_t) id;
208
209		if (conf.newname != NULL)
210			grp->gr_name = pw_checkname(conf.newname, 0);
211	} else {
212		if (name == NULL)	/* Required */
213			errx(EX_DATAERR, "group name required");
214		else if (grp != NULL)	/* Exists */
215			errx(EX_DATAERR, "group name `%s' already exists", name);
216
217		grp = &fakegroup;
218		grp->gr_name = pw_checkname(name, 0);
219		grp->gr_passwd = "*";
220		grp->gr_gid = gr_gidpolicy(cnf, id);
221		grp->gr_mem = NULL;
222	}
223
224	/*
225	 * This allows us to set a group password Group passwords is an
226	 * antique idea, rarely used and insecure (no secure database) Should
227	 * be discouraged, but it is apparently still supported by some
228	 * software.
229	 */
230
231	if (conf.which == W_GROUP && conf.fd != -1)
232		set_passwd(grp, mode == M_UPDATE);
233
234	if (((arg = getarg(args, 'M')) != NULL ||
235	    (arg = getarg(args, 'd')) != NULL ||
236	    (arg = getarg(args, 'm')) != NULL) && arg->val) {
237		char   *p;
238		struct passwd	*pwd;
239
240		/* Make sure this is not stay NULL with -M "" */
241		if (arg->ch == 'd')
242			delete_members(grp, arg->val);
243		else if (arg->ch == 'M')
244			grp->gr_mem = NULL;
245
246		for (p = strtok(arg->val, ", \t"); arg->ch != 'd' &&  p != NULL;
247		    p = strtok(NULL, ", \t")) {
248			int	j;
249
250			/*
251			 * Check for duplicates
252			 */
253			pwd = lookup_pwent(p);
254			for (j = 0; grp->gr_mem != NULL && grp->gr_mem[j] != NULL; j++) {
255				if (strcmp(grp->gr_mem[j], pwd->pw_name) == 0)
256					break;
257			}
258			if (grp->gr_mem != NULL && grp->gr_mem[j] != NULL)
259				continue;
260			grp = gr_add(grp, pwd->pw_name);
261		}
262	}
263
264	if (conf.dryrun)
265		return print_group(grp);
266
267	if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
268		if (rc == -1)
269			errx(EX_IOERR, "group '%s' already exists",
270			    grp->gr_name);
271		else
272			err(EX_IOERR, "group update");
273	} else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) {
274		if (rc == -1)
275			errx(EX_IOERR, "group '%s' not available (NIS?)",
276			    grp->gr_name);
277		else
278			err(EX_IOERR, "group update");
279	}
280
281	if (conf.newname != NULL)
282		name = conf.newname;
283	/* grp may have been invalidated */
284	if ((grp = GETGRNAM(name)) == NULL)
285		errx(EX_SOFTWARE, "group disappeared during update");
286
287	pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid);
288
289	free(members);
290
291	return EXIT_SUCCESS;
292}
293
294
295/*
296 * Lookup a passwd entry using a name or UID.
297 */
298static struct passwd *
299lookup_pwent(const char *user)
300{
301	struct passwd *pwd;
302
303	if ((pwd = GETPWNAM(user)) == NULL &&
304	    (!isdigit((unsigned char)*user) ||
305	    (pwd = getpwuid((uid_t) atoi(user))) == NULL))
306		errx(EX_NOUSER, "user `%s' does not exist", user);
307
308	return (pwd);
309}
310
311
312/*
313 * Delete requested members from a group.
314 */
315static void
316delete_members(struct group *grp, char *list)
317{
318	char *p;
319	int k;
320
321	if (grp->gr_mem == NULL)
322		return;
323
324	for (p = strtok(list, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
325		for (k = 0; grp->gr_mem[k] != NULL; k++) {
326			if (strcmp(grp->gr_mem[k], p) == 0)
327				break;
328		}
329		if (grp->gr_mem[k] == NULL) /* No match */
330			continue;
331
332		for (; grp->gr_mem[k] != NULL; k++)
333			grp->gr_mem[k] = grp->gr_mem[k+1];
334	}
335}
336
337
338static          gid_t
339gr_gidpolicy(struct userconf * cnf, long id)
340{
341	struct group   *grp;
342	gid_t           gid = (gid_t) - 1;
343
344	/*
345	 * Check the given gid, if any
346	 */
347	if (id > 0) {
348		gid = (gid_t) id;
349
350		if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
351			errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid);
352	} else {
353		struct bitmap   bm;
354
355		/*
356		 * We need to allocate the next available gid under one of
357		 * two policies a) Grab the first unused gid b) Grab the
358		 * highest possible unused gid
359		 */
360		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
361			cnf->min_gid = 1000;
362			cnf->max_gid = 32000;
363		}
364		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
365
366		/*
367		 * Now, let's fill the bitmap from the password file
368		 */
369		SETGRENT();
370		while ((grp = GETGRENT()) != NULL)
371			if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
372                            (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
373				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
374		ENDGRENT();
375
376		/*
377		 * Then apply the policy, with fallback to reuse if necessary
378		 */
379		if (cnf->reuse_gids)
380			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
381		else {
382			gid = (gid_t) (bm_lastset(&bm) + 1);
383			if (!bm_isset(&bm, gid))
384				gid += cnf->min_gid;
385			else
386				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
387		}
388
389		/*
390		 * Another sanity check
391		 */
392		if (gid < cnf->min_gid || gid > cnf->max_gid)
393			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
394		bm_dealloc(&bm);
395	}
396	return gid;
397}
398
399
400static int
401print_group(struct group * grp)
402{
403	if (!conf.pretty) {
404		char           *buf = NULL;
405
406		buf = gr_make(grp);
407		printf("%s\n", buf);
408		free(buf);
409	} else {
410		int             i;
411
412		printf("Group Name: %-15s   #%lu\n"
413		       "   Members: ",
414		       grp->gr_name, (long) grp->gr_gid);
415		if (grp->gr_mem != NULL) {
416			for (i = 0; grp->gr_mem[i]; i++)
417				printf("%s%s", i ? "," : "", grp->gr_mem[i]);
418		}
419		fputs("\n\n", stdout);
420	}
421	return EXIT_SUCCESS;
422}
423