pw_group.c revision 285413 
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 285413 2015-07-11 23:17:13Z 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	struct userconf	*cnf = conf.userconf;
166
167	static struct group fakegroup =
168	{
169		"nogroup",
170		"*",
171		-1,
172		NULL
173	};
174
175	if (mode == M_NEXT)
176		return (pw_groupnext(cnf, conf.quiet));
177
178	if (mode == M_PRINT)
179		return (pw_groupshow(name, id, &fakegroup));
180
181	if (mode == M_DELETE)
182		return (pw_groupdel(name, id));
183
184	if (mode == M_LOCK || mode == M_UNLOCK)
185		errx(EX_USAGE, "'lock' command is not available for groups");
186
187	if (id < 0 && name == NULL)
188		errx(EX_DATAERR, "group name or id required");
189
190	grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
191
192	if (mode == M_UPDATE) {
193		if (name == NULL && grp == NULL)	/* Try harder */
194			grp = GETGRGID(id);
195
196		if (grp == NULL) {
197			if (name == NULL)
198				errx(EX_DATAERR, "unknown group `%s'", name);
199			else
200				errx(EX_DATAERR, "unknown group `%ld'", id);
201		}
202		if (name == NULL)	/* Needed later */
203			name = grp->gr_name;
204
205		if (id > 0)
206			grp->gr_gid = (gid_t) id;
207
208		if (conf.newname != NULL)
209			grp->gr_name = pw_checkname(conf.newname, 0);
210	} else {
211		if (name == NULL)	/* Required */
212			errx(EX_DATAERR, "group name required");
213		else if (grp != NULL)	/* Exists */
214			errx(EX_DATAERR, "group name `%s' already exists", name);
215
216		grp = &fakegroup;
217		grp->gr_name = pw_checkname(name, 0);
218		grp->gr_passwd = "*";
219		grp->gr_gid = gr_gidpolicy(cnf, id);
220		grp->gr_mem = NULL;
221	}
222
223	/*
224	 * This allows us to set a group password Group passwords is an
225	 * antique idea, rarely used and insecure (no secure database) Should
226	 * be discouraged, but it is apparently still supported by some
227	 * software.
228	 */
229
230	if (conf.which == W_GROUP && conf.fd != -1)
231		set_passwd(grp, mode == M_UPDATE);
232
233	if (((arg = getarg(args, 'M')) != NULL ||
234	    (arg = getarg(args, 'd')) != NULL ||
235	    (arg = getarg(args, 'm')) != NULL) && arg->val) {
236		char   *p;
237		struct passwd	*pwd;
238
239		/* Make sure this is not stay NULL with -M "" */
240		if (arg->ch == 'd')
241			delete_members(grp, arg->val);
242		else if (arg->ch == 'M')
243			grp->gr_mem = NULL;
244
245		for (p = strtok(arg->val, ", \t"); arg->ch != 'd' &&  p != NULL;
246		    p = strtok(NULL, ", \t")) {
247			int	j;
248
249			/*
250			 * Check for duplicates
251			 */
252			pwd = lookup_pwent(p);
253			for (j = 0; grp->gr_mem != NULL && grp->gr_mem[j] != NULL; j++) {
254				if (strcmp(grp->gr_mem[j], pwd->pw_name) == 0)
255					break;
256			}
257			if (grp->gr_mem != NULL && grp->gr_mem[j] != NULL)
258				continue;
259			grp = gr_add(grp, pwd->pw_name);
260		}
261	}
262
263	if (conf.dryrun)
264		return print_group(grp);
265
266	if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
267		if (rc == -1)
268			errx(EX_IOERR, "group '%s' already exists",
269			    grp->gr_name);
270		else
271			err(EX_IOERR, "group update");
272	} else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) {
273		if (rc == -1)
274			errx(EX_IOERR, "group '%s' not available (NIS?)",
275			    grp->gr_name);
276		else
277			err(EX_IOERR, "group update");
278	}
279
280	if (conf.newname != NULL)
281		name = conf.newname;
282	/* grp may have been invalidated */
283	if ((grp = GETGRNAM(name)) == NULL)
284		errx(EX_SOFTWARE, "group disappeared during update");
285
286	pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid);
287
288	return EXIT_SUCCESS;
289}
290
291
292/*
293 * Lookup a passwd entry using a name or UID.
294 */
295static struct passwd *
296lookup_pwent(const char *user)
297{
298	struct passwd *pwd;
299
300	if ((pwd = GETPWNAM(user)) == NULL &&
301	    (!isdigit((unsigned char)*user) ||
302	    (pwd = getpwuid((uid_t) atoi(user))) == NULL))
303		errx(EX_NOUSER, "user `%s' does not exist", user);
304
305	return (pwd);
306}
307
308
309/*
310 * Delete requested members from a group.
311 */
312static void
313delete_members(struct group *grp, char *list)
314{
315	char *p;
316	int k;
317
318	if (grp->gr_mem == NULL)
319		return;
320
321	for (p = strtok(list, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
322		for (k = 0; grp->gr_mem[k] != NULL; k++) {
323			if (strcmp(grp->gr_mem[k], p) == 0)
324				break;
325		}
326		if (grp->gr_mem[k] == NULL) /* No match */
327			continue;
328
329		for (; grp->gr_mem[k] != NULL; k++)
330			grp->gr_mem[k] = grp->gr_mem[k+1];
331	}
332}
333
334
335static          gid_t
336gr_gidpolicy(struct userconf * cnf, long id)
337{
338	struct group   *grp;
339	gid_t           gid = (gid_t) - 1;
340
341	/*
342	 * Check the given gid, if any
343	 */
344	if (id > 0) {
345		gid = (gid_t) id;
346
347		if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
348			errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid);
349	} else {
350		struct bitmap   bm;
351
352		/*
353		 * We need to allocate the next available gid under one of
354		 * two policies a) Grab the first unused gid b) Grab the
355		 * highest possible unused gid
356		 */
357		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
358			cnf->min_gid = 1000;
359			cnf->max_gid = 32000;
360		}
361		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
362
363		/*
364		 * Now, let's fill the bitmap from the password file
365		 */
366		SETGRENT();
367		while ((grp = GETGRENT()) != NULL)
368			if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
369                            (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
370				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
371		ENDGRENT();
372
373		/*
374		 * Then apply the policy, with fallback to reuse if necessary
375		 */
376		if (cnf->reuse_gids)
377			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
378		else {
379			gid = (gid_t) (bm_lastset(&bm) + 1);
380			if (!bm_isset(&bm, gid))
381				gid += cnf->min_gid;
382			else
383				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
384		}
385
386		/*
387		 * Another sanity check
388		 */
389		if (gid < cnf->min_gid || gid > cnf->max_gid)
390			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
391		bm_dealloc(&bm);
392	}
393	return gid;
394}
395
396
397static int
398print_group(struct group * grp)
399{
400	if (!conf.pretty) {
401		char           *buf = NULL;
402
403		buf = gr_make(grp);
404		printf("%s\n", buf);
405		free(buf);
406	} else {
407		int             i;
408
409		printf("Group Name: %-15s   #%lu\n"
410		       "   Members: ",
411		       grp->gr_name, (long) grp->gr_gid);
412		if (grp->gr_mem != NULL) {
413			for (i = 0; grp->gr_mem[i]; i++)
414				printf("%s%s", i ? "," : "", grp->gr_mem[i]);
415		}
416		fputs("\n\n", stdout);
417	}
418	return EXIT_SUCCESS;
419}
420