pw_group.c revision 52502 
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 52502 1999-10-26 04:27:14Z davidn $";
30#endif /* not lint */
31
32#include <ctype.h>
33#include <err.h>
34#include <termios.h>
35#include <unistd.h>
36
37#include "pw.h"
38#include "bitmap.h"
39
40
41static int      print_group(struct group * grp, int pretty);
42static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
43
44int
45pw_group(struct userconf * cnf, int mode, struct cargs * args)
46{
47	int		rc;
48	struct carg    *a_name = getarg(args, 'n');
49	struct carg    *a_gid = getarg(args, 'g');
50	struct carg    *arg;
51	struct group   *grp = NULL;
52	int	        grmembers = 0;
53	char           **members = NULL;
54
55	static struct group fakegroup =
56	{
57		"nogroup",
58		"*",
59		-1,
60		NULL
61	};
62
63	/*
64	 * With M_NEXT, we only need to return the
65	 * next gid to stdout
66	 */
67	if (mode == M_NEXT)
68	{
69		gid_t next = gr_gidpolicy(cnf, args);
70		if (getarg(args, 'q'))
71			return next;
72		printf("%ld\n", (long)next);
73		return EXIT_SUCCESS;
74	}
75
76	if (mode == M_PRINT && getarg(args, 'a')) {
77		int             pretty = getarg(args, 'P') != NULL;
78
79		SETGRENT();
80		while ((grp = GETGRENT()) != NULL)
81			print_group(grp, pretty);
82		ENDGRENT();
83		return EXIT_SUCCESS;
84	}
85	if (a_gid == NULL) {
86		if (a_name == NULL)
87			errx(EX_DATAERR, "group name or id required");
88
89		if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
90			(a_gid = a_name)->ch = 'g';
91			a_name = NULL;
92		}
93	}
94	grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
95
96	if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
97		if (a_name == NULL && grp == NULL)	/* Try harder */
98			grp = GETGRGID(atoi(a_gid->val));
99
100		if (grp == NULL) {
101			if (mode == M_PRINT && getarg(args, 'F')) {
102				char	*fmems[1];
103				fmems[0] = NULL;
104				fakegroup.gr_name = a_name ? a_name->val : "nogroup";
105				fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
106				fakegroup.gr_mem = fmems;
107				return print_group(&fakegroup, getarg(args, 'P') != NULL);
108			}
109			errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
110		}
111		if (a_name == NULL)	/* Needed later */
112			a_name = addarg(args, 'n', grp->gr_name);
113
114		/*
115		 * Handle deletions now
116		 */
117		if (mode == M_DELETE) {
118			gid_t           gid = grp->gr_gid;
119
120			rc = delgrent(grp);
121			if (rc == -1)
122				err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
123			else if (rc != 0) {
124				warnc(rc, "group update");
125				return EX_IOERR;
126			}
127			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
128			return EXIT_SUCCESS;
129		} else if (mode == M_PRINT)
130			return print_group(grp, getarg(args, 'P') != NULL);
131
132		if (a_gid)
133			grp->gr_gid = (gid_t) atoi(a_gid->val);
134
135		if ((arg = getarg(args, 'l')) != NULL)
136			grp->gr_name = pw_checkname((u_char *)arg->val, 0);
137	} else {
138		if (a_name == NULL)	/* Required */
139			errx(EX_DATAERR, "group name required");
140		else if (grp != NULL)	/* Exists */
141			errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
142
143		extendarray(&members, &grmembers, 200);
144		members[0] = NULL;
145		grp = &fakegroup;
146		grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
147		grp->gr_passwd = "*";
148		grp->gr_gid = gr_gidpolicy(cnf, args);
149		grp->gr_mem = members;
150	}
151
152	/*
153	 * This allows us to set a group password Group passwords is an
154	 * antique idea, rarely used and insecure (no secure database) Should
155	 * be discouraged, but it is apparently still supported by some
156	 * software.
157	 */
158
159	if ((arg = getarg(args, 'h')) != NULL) {
160		if (strcmp(arg->val, "-") == 0)
161			grp->gr_passwd = "*";	/* No access */
162		else {
163			int             fd = atoi(arg->val);
164			int             b;
165			int             istty = isatty(fd);
166			struct termios  t;
167			char           *p, line[256];
168
169			if (istty) {
170				if (tcgetattr(fd, &t) == -1)
171					istty = 0;
172				else {
173					struct termios  n = t;
174
175					/* Disable echo */
176					n.c_lflag &= ~(ECHO);
177					tcsetattr(fd, TCSANOW, &n);
178					printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
179					fflush(stdout);
180				}
181			}
182			b = read(fd, line, sizeof(line) - 1);
183			if (istty) {	/* Restore state */
184				tcsetattr(fd, TCSANOW, &t);
185				fputc('\n', stdout);
186				fflush(stdout);
187			}
188			if (b < 0) {
189				warn("-h file descriptor");
190				return EX_OSERR;
191			}
192			line[b] = '\0';
193			if ((p = strpbrk(line, " \t\r\n")) != NULL)
194				*p = '\0';
195			if (!*line)
196				errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
197			grp->gr_passwd = pw_pwcrypt(line);
198		}
199	}
200
201	if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
202		int	i = 0;
203		char   *p;
204		struct passwd	*pwd;
205
206		/* Make sure this is not stay NULL with -M "" */
207		extendarray(&members, &grmembers, 200);
208		if (arg->ch == 'm') {
209			int	k = 0;
210
211			while (grp->gr_mem[k] != NULL) {
212				if (extendarray(&members, &grmembers, i + 2) != -1) {
213					members[i++] = grp->gr_mem[k];
214				}
215				k++;
216			}
217		}
218		for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
219			int     j;
220			if ((pwd = GETPWNAM(p)) == NULL) {
221				if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
222					errx(EX_NOUSER, "user `%s' does not exist", p);
223			}
224			/*
225			 * Check for duplicates
226			 */
227			for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
228				;
229			if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
230				members[i++] = newstr(pwd->pw_name);
231		}
232		while (i < grmembers)
233			members[i++] = NULL;
234		grp->gr_mem = members;
235	}
236
237	if (getarg(args, 'N') != NULL)
238		return print_group(grp, getarg(args, 'P') != NULL);
239
240	if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
241		if (rc == -1)
242			warnx("group '%s' already exists", grp->gr_name);
243		else
244			warn("group update");
245		return EX_IOERR;
246	} else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
247		if (rc == -1)
248			warnx("group '%s' not available (NIS?)", grp->gr_name);
249		else
250			warnc(rc, "group update");
251		return EX_IOERR;
252	}
253	/* grp may have been invalidated */
254	if ((grp = GETGRNAM(a_name->val)) == NULL)
255		errx(EX_SOFTWARE, "group disappeared during update");
256
257	pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
258
259	if (members)
260		free(members);
261
262	return EXIT_SUCCESS;
263}
264
265
266static          gid_t
267gr_gidpolicy(struct userconf * cnf, struct cargs * args)
268{
269	struct group   *grp;
270	gid_t           gid = (gid_t) - 1;
271	struct carg    *a_gid = getarg(args, 'g');
272
273	/*
274	 * Check the given gid, if any
275	 */
276	if (a_gid != NULL) {
277		gid = (gid_t) atol(a_gid->val);
278
279		if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
280			errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
281	} else {
282		struct bitmap   bm;
283
284		/*
285		 * We need to allocate the next available gid under one of
286		 * two policies a) Grab the first unused gid b) Grab the
287		 * highest possible unused gid
288		 */
289		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
290			cnf->min_gid = 1000;
291			cnf->max_gid = 32000;
292		}
293		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
294
295		/*
296		 * Now, let's fill the bitmap from the password file
297		 */
298		SETGRENT();
299		while ((grp = GETGRENT()) != NULL)
300			if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
301				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
302		ENDGRENT();
303
304		/*
305		 * Then apply the policy, with fallback to reuse if necessary
306		 */
307		if (cnf->reuse_gids)
308			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
309		else {
310			gid = (gid_t) (bm_lastset(&bm) + 1);
311			if (!bm_isset(&bm, gid))
312				gid += cnf->min_gid;
313			else
314				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
315		}
316
317		/*
318		 * Another sanity check
319		 */
320		if (gid < cnf->min_gid || gid > cnf->max_gid)
321			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
322		bm_dealloc(&bm);
323	}
324	return gid;
325}
326
327
328static int
329print_group(struct group * grp, int pretty)
330{
331	if (!pretty) {
332		int		buflen = 0;
333		char           *buf = NULL;
334
335		fmtgrent(&buf, &buflen, grp);
336		fputs(buf, stdout);
337		free(buf);
338	} else {
339		int             i;
340
341		printf("Group Name: %-15s   #%lu\n"
342		       "   Members: ",
343		       grp->gr_name, (long) grp->gr_gid);
344		for (i = 0; grp->gr_mem[i]; i++)
345			printf("%s%s", i ? "," : "", grp->gr_mem[i]);
346		fputs("\n\n", stdout);
347	}
348	return EXIT_SUCCESS;
349}
350