pw_group.c revision 50479 
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 50479 1999-08-28 01:35:59Z peter $";
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	struct carg    *a_name = getarg(args, 'n');
48	struct carg    *a_gid = getarg(args, 'g');
49	struct carg    *arg;
50	struct group   *grp = NULL;
51	int	        grmembers = 0;
52	char          **members = NULL;
53
54	static struct group fakegroup =
55	{
56		"nogroup",
57		"*",
58		-1,
59		NULL
60	};
61
62	/*
63	 * With M_NEXT, we only need to return the
64	 * next gid to stdout
65	 */
66	if (mode == M_NEXT)
67	{
68		gid_t next = gr_gidpolicy(cnf, args);
69		if (getarg(args, 'q'))
70			return next;
71		printf("%ld\n", (long)next);
72		return EXIT_SUCCESS;
73	}
74
75	if (mode == M_PRINT && getarg(args, 'a')) {
76		int             pretty = getarg(args, 'P') != NULL;
77
78		SETGRENT();
79		while ((grp = GETGRENT()) != NULL)
80			print_group(grp, pretty);
81		ENDGRENT();
82		return EXIT_SUCCESS;
83	}
84	if (a_gid == NULL) {
85		if (a_name == NULL)
86			errx(EX_DATAERR, "group name or id required");
87
88		if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
89			(a_gid = a_name)->ch = 'g';
90			a_name = NULL;
91		}
92	}
93	grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
94
95	if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
96		if (a_name == NULL && grp == NULL)	/* Try harder */
97			grp = GETGRGID(atoi(a_gid->val));
98
99		if (grp == NULL) {
100			if (mode == M_PRINT && getarg(args, 'F')) {
101				char	*fmems[1];
102				fmems[0] = NULL;
103				fakegroup.gr_name = a_name ? a_name->val : "nogroup";
104				fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
105				fakegroup.gr_mem = fmems;
106				return print_group(&fakegroup, getarg(args, 'P') != NULL);
107			}
108			errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
109		}
110		if (a_name == NULL)	/* Needed later */
111			a_name = addarg(args, 'n', grp->gr_name);
112
113		/*
114		 * Handle deletions now
115		 */
116		if (mode == M_DELETE) {
117			gid_t           gid = grp->gr_gid;
118
119			if (delgrent(grp) == -1)
120				err(EX_IOERR, "error updating group file");
121			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
122			return EXIT_SUCCESS;
123		} else if (mode == M_PRINT)
124			return print_group(grp, getarg(args, 'P') != NULL);
125
126		if (a_gid)
127			grp->gr_gid = (gid_t) atoi(a_gid->val);
128
129		if ((arg = getarg(args, 'l')) != NULL)
130			grp->gr_name = pw_checkname((u_char *)arg->val, 0);
131	} else {
132		if (a_name == NULL)	/* Required */
133			errx(EX_DATAERR, "group name required");
134		else if (grp != NULL)	/* Exists */
135			errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
136
137		extendarray(&members, &grmembers, 200);
138		members[0] = NULL;
139		grp = &fakegroup;
140		grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
141		grp->gr_passwd = "*";
142		grp->gr_gid = gr_gidpolicy(cnf, args);
143		grp->gr_mem = members;
144	}
145
146	/*
147	 * This allows us to set a group password Group passwords is an
148	 * antique idea, rarely used and insecure (no secure database) Should
149	 * be discouraged, but it is apparently still supported by some
150	 * software.
151	 */
152
153	if ((arg = getarg(args, 'h')) != NULL) {
154		if (strcmp(arg->val, "-") == 0)
155			grp->gr_passwd = "*";	/* No access */
156		else {
157			int             fd = atoi(arg->val);
158			int             b;
159			int             istty = isatty(fd);
160			struct termios  t;
161			char           *p, line[256];
162
163			if (istty) {
164				if (tcgetattr(fd, &t) == -1)
165					istty = 0;
166				else {
167					struct termios  n = t;
168
169					/* Disable echo */
170					n.c_lflag &= ~(ECHO);
171					tcsetattr(fd, TCSANOW, &n);
172					printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
173					fflush(stdout);
174				}
175			}
176			b = read(fd, line, sizeof(line) - 1);
177			if (istty) {	/* Restore state */
178				tcsetattr(fd, TCSANOW, &t);
179				fputc('\n', stdout);
180				fflush(stdout);
181			}
182			if (b < 0) {
183				warn("-h file descriptor");
184				return EX_OSERR;
185			}
186			line[b] = '\0';
187			if ((p = strpbrk(line, " \t\r\n")) != NULL)
188				*p = '\0';
189			if (!*line)
190				errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
191			grp->gr_passwd = pw_pwcrypt(line);
192		}
193	}
194
195	if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
196		int	i = 0;
197		char   *p;
198		struct passwd	*pwd;
199
200		/* Make sure this is not stay NULL with -M "" */
201		extendarray(&members, &grmembers, 200);
202		if (arg->ch == 'm') {
203			int	k = 0;
204
205			while (grp->gr_mem[k] != NULL) {
206				if (extendarray(&members, &grmembers, i + 2) != -1) {
207					members[i++] = grp->gr_mem[k];
208				}
209				k++;
210			}
211		}
212		for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
213			int     j;
214			if ((pwd = GETPWNAM(p)) == NULL) {
215				if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
216					errx(EX_NOUSER, "user `%s' does not exist", p);
217			}
218			/*
219			 * Check for duplicates
220			 */
221			for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
222				;
223			if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
224				members[i++] = newstr(pwd->pw_name);
225		}
226		while (i < grmembers)
227			members[i++] = NULL;
228		grp->gr_mem = members;
229	}
230
231	if (getarg(args, 'N') != NULL)
232		return print_group(grp, getarg(args, 'P') != NULL);
233
234	if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
235		warn("group update");
236		return EX_IOERR;
237	}
238	/* grp may have been invalidated */
239	if ((grp = GETGRNAM(a_name->val)) == NULL)
240		errx(EX_SOFTWARE, "group disappeared during update");
241
242	pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
243
244	if (members)
245		free(members);
246
247	return EXIT_SUCCESS;
248}
249
250
251static          gid_t
252gr_gidpolicy(struct userconf * cnf, struct cargs * args)
253{
254	struct group   *grp;
255	gid_t           gid = (gid_t) - 1;
256	struct carg    *a_gid = getarg(args, 'g');
257
258	/*
259	 * Check the given gid, if any
260	 */
261	if (a_gid != NULL) {
262		gid = (gid_t) atol(a_gid->val);
263
264		if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
265			errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
266	} else {
267		struct bitmap   bm;
268
269		/*
270		 * We need to allocate the next available gid under one of
271		 * two policies a) Grab the first unused gid b) Grab the
272		 * highest possible unused gid
273		 */
274		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
275			cnf->min_gid = 1000;
276			cnf->max_gid = 32000;
277		}
278		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
279
280		/*
281		 * Now, let's fill the bitmap from the password file
282		 */
283		SETGRENT();
284		while ((grp = GETGRENT()) != NULL)
285			if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
286				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
287		ENDGRENT();
288
289		/*
290		 * Then apply the policy, with fallback to reuse if necessary
291		 */
292		if (cnf->reuse_gids)
293			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
294		else {
295			gid = (gid_t) (bm_lastset(&bm) + 1);
296			if (!bm_isset(&bm, gid))
297				gid += cnf->min_gid;
298			else
299				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
300		}
301
302		/*
303		 * Another sanity check
304		 */
305		if (gid < cnf->min_gid || gid > cnf->max_gid)
306			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
307		bm_dealloc(&bm);
308	}
309	return gid;
310}
311
312
313static int
314print_group(struct group * grp, int pretty)
315{
316	if (!pretty) {
317		int		buflen = 0;
318		char           *buf = NULL;
319
320		fmtgrent(&buf, &buflen, grp);
321		fputs(buf, stdout);
322		free(buf);
323	} else {
324		int             i;
325
326		printf("Group Name: %-15s   #%lu\n"
327		       "   Members: ",
328		       grp->gr_name, (long) grp->gr_gid);
329		for (i = 0; grp->gr_mem[i]; i++)
330			printf("%s%s", i ? "," : "", grp->gr_mem[i]);
331		fputs("\n\n", stdout);
332	}
333	return EXIT_SUCCESS;
334}
335