pw_group.c revision 285396 
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 285396 2015-07-11 17:01:08Z 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(char ***members, int *grmembers, int *i,
46    struct carg *arg, struct group *grp);
47static int	print_group(struct group * grp);
48static gid_t    gr_gidpolicy(struct userconf * cnf, long id);
49
50static void
51set_passwd(struct group *grp, bool update)
52{
53	int		 b;
54	int		 istty;
55	struct termios	 t, n;
56	char		*p, line[256];
57
58	if (conf.fd == '-') {
59		grp->gr_passwd = "*";	/* No access */
60		return;
61	}
62
63	if ((istty = isatty(conf.fd))) {
64		n = t;
65		/* Disable echo */
66		n.c_lflag &= ~(ECHO);
67		tcsetattr(conf.fd, TCSANOW, &n);
68		printf("%sassword for group %s:", update ? "New p" : "P",
69		    grp->gr_name);
70		fflush(stdout);
71	}
72	b = read(conf.fd, line, sizeof(line) - 1);
73	if (istty) {	/* Restore state */
74		tcsetattr(conf.fd, TCSANOW, &t);
75		fputc('\n', stdout);
76		fflush(stdout);
77	}
78	if (b < 0)
79		err(EX_OSERR, "-h file descriptor");
80	line[b] = '\0';
81	if ((p = strpbrk(line, " \t\r\n")) != NULL)
82		*p = '\0';
83	if (!*line)
84		errx(EX_DATAERR, "empty password read on file descriptor %d",
85		    conf.fd);
86	if (conf.precrypted) {
87		if (strchr(line, ':') != 0)
88			errx(EX_DATAERR, "wrong encrypted passwrd");
89		grp->gr_passwd = line;
90	} else
91		grp->gr_passwd = pw_pwcrypt(line);
92}
93
94int
95pw_groupnext(struct userconf *cnf, bool quiet)
96{
97	gid_t next = gr_gidpolicy(cnf, -1);
98
99	if (quiet)
100		return (next);
101	printf("%u\n", next);
102
103	return (EXIT_SUCCESS);
104}
105
106int
107pw_group(int mode, char *name, long id, struct cargs * args)
108{
109	int		rc;
110	struct carg    *arg;
111	struct group   *grp = NULL;
112	int	        grmembers = 0;
113	char           **members = NULL;
114	struct userconf	*cnf = conf.userconf;
115
116	static struct group fakegroup =
117	{
118		"nogroup",
119		"*",
120		-1,
121		NULL
122	};
123
124	if (mode == M_NEXT)
125		return (pw_groupnext(cnf, conf.quiet));
126
127	if (mode == M_LOCK || mode == M_UNLOCK)
128		errx(EX_USAGE, "'lock' command is not available for groups");
129
130	if (mode == M_PRINT && getarg(args, 'a')) {
131		SETGRENT();
132		while ((grp = GETGRENT()) != NULL)
133			print_group(grp);
134		ENDGRENT();
135		return EXIT_SUCCESS;
136	}
137	if (id < 0 && name == NULL)
138		errx(EX_DATAERR, "group name or id required");
139
140	grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
141
142	if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
143		if (name == NULL && grp == NULL)	/* Try harder */
144			grp = GETGRGID(id);
145
146		if (grp == NULL) {
147			if (mode == M_PRINT && getarg(args, 'F')) {
148				char	*fmems[1];
149				fmems[0] = NULL;
150				fakegroup.gr_name = name ? name : "nogroup";
151				fakegroup.gr_gid = (gid_t) id;
152				fakegroup.gr_mem = fmems;
153				return print_group(&fakegroup);
154			}
155			if (name == NULL)
156				errx(EX_DATAERR, "unknown group `%s'", name);
157			else
158				errx(EX_DATAERR, "unknown group `%ld'", id);
159		}
160		if (name == NULL)	/* Needed later */
161			name = grp->gr_name;
162
163		/*
164		 * Handle deletions now
165		 */
166		if (mode == M_DELETE) {
167			rc = delgrent(grp);
168			if (rc == -1)
169				err(EX_IOERR, "group '%s' not available (NIS?)",
170				    name);
171			else if (rc != 0) {
172				err(EX_IOERR, "group update");
173			}
174			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", name, id);
175			return EXIT_SUCCESS;
176		} else if (mode == M_PRINT)
177			return print_group(grp);
178
179		if (id > 0)
180			grp->gr_gid = (gid_t) id;
181
182		if (conf.newname != NULL)
183			grp->gr_name = pw_checkname(conf.newname, 0);
184	} else {
185		if (name == NULL)	/* Required */
186			errx(EX_DATAERR, "group name required");
187		else if (grp != NULL)	/* Exists */
188			errx(EX_DATAERR, "group name `%s' already exists", name);
189
190		extendarray(&members, &grmembers, 200);
191		members[0] = NULL;
192		grp = &fakegroup;
193		grp->gr_name = pw_checkname(name, 0);
194		grp->gr_passwd = "*";
195		grp->gr_gid = gr_gidpolicy(cnf, id);
196		grp->gr_mem = members;
197	}
198
199	/*
200	 * This allows us to set a group password Group passwords is an
201	 * antique idea, rarely used and insecure (no secure database) Should
202	 * be discouraged, but it is apparently still supported by some
203	 * software.
204	 */
205
206	if (conf.which == W_GROUP && conf.fd != -1)
207		set_passwd(grp, mode == M_UPDATE);
208
209	if (((arg = getarg(args, 'M')) != NULL ||
210	    (arg = getarg(args, 'd')) != NULL ||
211	    (arg = getarg(args, 'm')) != NULL) && arg->val) {
212		int	i = 0;
213		char   *p;
214		struct passwd	*pwd;
215
216		/* Make sure this is not stay NULL with -M "" */
217		extendarray(&members, &grmembers, 200);
218		if (arg->ch == 'd')
219			delete_members(&members, &grmembers, &i, arg, grp);
220		else if (arg->ch == 'm') {
221			int	k = 0;
222
223			if (grp->gr_mem != NULL) {
224				while (grp->gr_mem[k] != NULL) {
225					if (extendarray(&members, &grmembers, i + 2) != -1)
226						members[i++] = grp->gr_mem[k];
227					k++;
228				}
229			}
230		}
231
232		if (arg->ch != 'd')
233			for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
234				int	j;
235
236				/*
237				 * Check for duplicates
238				 */
239				pwd = lookup_pwent(p);
240				for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++)
241					;
242				if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
243					members[i++] = newstr(pwd->pw_name);
244			}
245		while (i < grmembers)
246			members[i++] = NULL;
247		grp->gr_mem = members;
248	}
249
250	if (conf.dryrun)
251		return print_group(grp);
252
253	if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
254		if (rc == -1)
255			errx(EX_IOERR, "group '%s' already exists",
256			    grp->gr_name);
257		else
258			err(EX_IOERR, "group update");
259	} else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) {
260		if (rc == -1)
261			errx(EX_IOERR, "group '%s' not available (NIS?)",
262			    grp->gr_name);
263		else
264			err(EX_IOERR, "group update");
265	}
266
267	if (conf.newname != NULL)
268		name = conf.newname;
269	/* grp may have been invalidated */
270	if ((grp = GETGRNAM(name)) == NULL)
271		errx(EX_SOFTWARE, "group disappeared during update");
272
273	pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid);
274
275	free(members);
276
277	return EXIT_SUCCESS;
278}
279
280
281/*
282 * Lookup a passwd entry using a name or UID.
283 */
284static struct passwd *
285lookup_pwent(const char *user)
286{
287	struct passwd *pwd;
288
289	if ((pwd = GETPWNAM(user)) == NULL &&
290	    (!isdigit((unsigned char)*user) ||
291	    (pwd = getpwuid((uid_t) atoi(user))) == NULL))
292		errx(EX_NOUSER, "user `%s' does not exist", user);
293
294	return (pwd);
295}
296
297
298/*
299 * Delete requested members from a group.
300 */
301static void
302delete_members(char ***members, int *grmembers, int *i, struct carg *arg,
303    struct group *grp)
304{
305	bool matchFound;
306	char *user;
307	char *valueCopy;
308	char *valuePtr;
309	int k;
310	struct passwd *pwd;
311
312	if (grp->gr_mem == NULL)
313		return;
314
315	k = 0;
316	while (grp->gr_mem[k] != NULL) {
317		matchFound = false;
318		if ((valueCopy = strdup(arg->val)) == NULL)
319			errx(EX_UNAVAILABLE, "out of memory");
320		valuePtr = valueCopy;
321		while ((user = strsep(&valuePtr, ", \t")) != NULL) {
322			pwd = lookup_pwent(user);
323			if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) {
324				matchFound = true;
325				break;
326			}
327		}
328		free(valueCopy);
329
330		if (!matchFound &&
331		    extendarray(members, grmembers, *i + 2) != -1)
332			(*members)[(*i)++] = grp->gr_mem[k];
333
334		k++;
335	}
336
337	return;
338}
339
340
341static          gid_t
342gr_gidpolicy(struct userconf * cnf, long id)
343{
344	struct group   *grp;
345	gid_t           gid = (gid_t) - 1;
346
347	/*
348	 * Check the given gid, if any
349	 */
350	if (id > 0) {
351		gid = (gid_t) id;
352
353		if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
354			errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid);
355	} else {
356		struct bitmap   bm;
357
358		/*
359		 * We need to allocate the next available gid under one of
360		 * two policies a) Grab the first unused gid b) Grab the
361		 * highest possible unused gid
362		 */
363		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
364			cnf->min_gid = 1000;
365			cnf->max_gid = 32000;
366		}
367		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
368
369		/*
370		 * Now, let's fill the bitmap from the password file
371		 */
372		SETGRENT();
373		while ((grp = GETGRENT()) != NULL)
374			if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
375                            (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
376				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
377		ENDGRENT();
378
379		/*
380		 * Then apply the policy, with fallback to reuse if necessary
381		 */
382		if (cnf->reuse_gids)
383			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
384		else {
385			gid = (gid_t) (bm_lastset(&bm) + 1);
386			if (!bm_isset(&bm, gid))
387				gid += cnf->min_gid;
388			else
389				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
390		}
391
392		/*
393		 * Another sanity check
394		 */
395		if (gid < cnf->min_gid || gid > cnf->max_gid)
396			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
397		bm_dealloc(&bm);
398	}
399	return gid;
400}
401
402
403static int
404print_group(struct group * grp)
405{
406	if (!conf.pretty) {
407		char           *buf = NULL;
408
409		buf = gr_make(grp);
410		printf("%s\n", buf);
411		free(buf);
412	} else {
413		int             i;
414
415		printf("Group Name: %-15s   #%lu\n"
416		       "   Members: ",
417		       grp->gr_name, (long) grp->gr_gid);
418		if (grp->gr_mem != NULL) {
419			for (i = 0; grp->gr_mem[i]; i++)
420				printf("%s%s", i ? "," : "", grp->gr_mem[i]);
421		}
422		fputs("\n\n", stdout);
423	}
424	return EXIT_SUCCESS;
425}
426