pw_group.c revision 22398 
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 *	$FreeBSD: head/usr.sbin/pw/pw_group.c 22398 1997-02-07 11:31:42Z davidn $
27 */
28
29#include <unistd.h>
30#include <ctype.h>
31#include <termios.h>
32
33#include "pw.h"
34#include "bitmap.h"
35#include "pwupd.h"
36
37
38static int      print_group(struct group * grp, int pretty);
39static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
40
41int
42pw_group(struct userconf * cnf, int mode, struct cargs * args)
43{
44	struct carg    *a_name = getarg(args, 'n');
45	struct carg    *a_gid = getarg(args, 'g');
46	struct carg    *arg;
47	struct group   *grp = NULL;
48	int	        grmembers = 0;
49	char          **members = NULL;
50
51	static struct group fakegroup =
52	{
53		"nogroup",
54		"*",
55		-1,
56		NULL
57	};
58
59	/*
60	 * With M_NEXT, we only need to return the
61	 * next gid to stdout
62	 */
63	if (mode == M_NEXT)
64	{
65		gid_t next = gr_gidpolicy(cnf, args);
66		if (getarg(args, 'q'))
67			return next;
68		printf("%ld\n", (long)next);
69		return EXIT_SUCCESS;
70	}
71
72	if (mode == M_PRINT && getarg(args, 'a')) {
73		int             pretty = getarg(args, 'P') != NULL;
74
75		setgrent();
76		while ((grp = getgrent()) != NULL)
77			print_group(grp, pretty);
78		endgrent();
79		return EXIT_SUCCESS;
80	}
81	if (a_gid == NULL) {
82		if (a_name == NULL)
83			cmderr(EX_DATAERR, "group name or id required\n");
84
85		if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
86			(a_gid = a_name)->ch = 'g';
87			a_name = NULL;
88		}
89	}
90	grp = (a_name != NULL) ? getgrnam(a_name->val) : getgrgid((gid_t) atoi(a_gid->val));
91
92	if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
93		if (a_name == NULL && grp == NULL)	/* Try harder */
94			grp = getgrgid(atoi(a_gid->val));
95
96		if (grp == NULL) {
97			if (mode == M_PRINT && getarg(args, 'F')) {
98				char	*fmems[1];
99				fmems[0] = NULL;
100				fakegroup.gr_name = a_name ? a_name->val : "nogroup";
101				fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
102				fakegroup.gr_mem = fmems;
103				return print_group(&fakegroup, getarg(args, 'P') != NULL);
104			}
105			cmderr(EX_DATAERR, "unknown group `%s'\n", a_name ? a_name->val : a_gid->val);
106		}
107		if (a_name == NULL)	/* Needed later */
108			a_name = addarg(args, 'n', grp->gr_name);
109
110		/*
111		 * Handle deletions now
112		 */
113		if (mode == M_DELETE) {
114			gid_t           gid = grp->gr_gid;
115
116			if (delgrent(grp) == -1)
117				cmderr(EX_IOERR, "Error updating group file: %s\n", strerror(errno));
118			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
119			return EXIT_SUCCESS;
120		} else if (mode == M_PRINT)
121			return print_group(grp, getarg(args, 'P') != NULL);
122
123		if (a_gid)
124			grp->gr_gid = (gid_t) atoi(a_gid->val);
125
126		if ((arg = getarg(args, 'l')) != NULL)
127			grp->gr_name = pw_checkname((u_char *)arg->val, 0);
128	} else {
129		if (a_name == NULL)	/* Required */
130			cmderr(EX_DATAERR, "group name required\n");
131		else if (grp != NULL)	/* Exists */
132			cmderr(EX_DATAERR, "group name `%s' already exists\n", a_name->val);
133
134		extendarray(&members, &grmembers, 200);
135		members[0] = NULL;
136		grp = &fakegroup;
137		grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
138		grp->gr_passwd = "*";
139		grp->gr_gid = gr_gidpolicy(cnf, args);
140		grp->gr_mem = members;
141	}
142
143	/*
144	 * This allows us to set a group password Group passwords is an
145	 * antique idea, rarely used and insecure (no secure database) Should
146	 * be discouraged, but it is apparently still supported by some
147	 * software.
148	 */
149
150	if ((arg = getarg(args, 'h')) != NULL) {
151		if (strcmp(arg->val, "-") == 0)
152			grp->gr_passwd = "*";	/* No access */
153		else {
154			int             fd = atoi(arg->val);
155			int             b;
156			int             istty = isatty(fd);
157			struct termios  t;
158			char           *p, line[256];
159
160			if (istty) {
161				if (tcgetattr(fd, &t) == -1)
162					istty = 0;
163				else {
164					struct termios  n = t;
165
166					/* Disable echo */
167					n.c_lflag &= ~(ECHO);
168					tcsetattr(fd, TCSANOW, &n);
169					printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
170					fflush(stdout);
171				}
172			}
173			b = read(fd, line, sizeof(line) - 1);
174			if (istty) {	/* Restore state */
175				tcsetattr(fd, TCSANOW, &t);
176				fputc('\n', stdout);
177				fflush(stdout);
178			}
179			if (b < 0) {
180				perror("-h file descriptor");
181				return EX_OSERR;
182			}
183			line[b] = '\0';
184			if ((p = strpbrk(line, " \t\r\n")) != NULL)
185				*p = '\0';
186			if (!*line)
187				cmderr(EX_DATAERR, "empty password read on file descriptor %d\n", fd);
188			grp->gr_passwd = pw_pwcrypt(line);
189		}
190	}
191
192	if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
193		int	i = 0;
194		char   *p;
195		struct passwd	*pwd;
196
197		/* Make sure this is not stay NULL with -M "" */
198		extendarray(&members, &grmembers, 200);
199		if (arg->ch == 'm') {
200			int	k = 0;
201
202			while (grp->gr_mem[k] != NULL) {
203				if (extendarray(&members, &grmembers, i + 2) != -1) {
204					members[i++] = grp->gr_mem[k];
205				}
206				k++;
207			}
208		}
209		for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
210			int     j;
211			if ((pwd = getpwnam(p)) == NULL) {
212				if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
213					cmderr(EX_NOUSER, "user `%s' does not exist\n", p);
214			}
215			/*
216			 * Check for duplicates
217			 */
218			for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
219				;
220			if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
221				members[i++] = newstr(pwd->pw_name);
222		}
223		while (i < grmembers)
224			members[i++] = NULL;
225		grp->gr_mem = members;
226	}
227
228	if (getarg(args, 'N') != NULL)
229		return print_group(grp, getarg(args, 'P') != NULL);
230
231	if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
232		perror("group update");
233		return EX_IOERR;
234	}
235	/* grp may have been invalidated */
236	if ((grp = getgrnam(a_name->val)) == NULL)
237		cmderr(EX_SOFTWARE, "group disappeared during update\n");
238
239	pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
240
241	if (members)
242		free(members);
243
244	return EXIT_SUCCESS;
245}
246
247
248static          gid_t
249gr_gidpolicy(struct userconf * cnf, struct cargs * args)
250{
251	struct group   *grp;
252	gid_t           gid = (gid_t) - 1;
253	struct carg    *a_gid = getarg(args, 'g');
254
255	/*
256	 * Check the given gid, if any
257	 */
258	if (a_gid != NULL) {
259		gid = (gid_t) atol(a_gid->val);
260
261		if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL)
262			cmderr(EX_DATAERR, "gid `%ld' has already been allocated\n", (long) grp->gr_gid);
263	} else {
264		struct bitmap   bm;
265
266		/*
267		 * We need to allocate the next available gid under one of
268		 * two policies a) Grab the first unused gid b) Grab the
269		 * highest possible unused gid
270		 */
271		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
272			cnf->min_gid = 1000;
273			cnf->max_gid = 32000;
274		}
275		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
276
277		/*
278		 * Now, let's fill the bitmap from the password file
279		 */
280		setgrent();
281		while ((grp = getgrent()) != NULL)
282			if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
283				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
284		endgrent();
285
286		/*
287		 * Then apply the policy, with fallback to reuse if necessary
288		 */
289		if (cnf->reuse_gids)
290			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
291		else {
292			gid = (gid_t) (bm_lastset(&bm) + 1);
293			if (!bm_isset(&bm, gid))
294				gid += cnf->min_gid;
295			else
296				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
297		}
298
299		/*
300		 * Another sanity check
301		 */
302		if (gid < cnf->min_gid || gid > cnf->max_gid)
303			cmderr(EX_SOFTWARE, "unable to allocate a new gid - range fully used\n");
304		bm_dealloc(&bm);
305	}
306	return gid;
307}
308
309
310static int
311print_group(struct group * grp, int pretty)
312{
313	if (!pretty) {
314		int		buflen = 0;
315		char           *buf = NULL;
316
317		fmtgrent(&buf, &buflen, grp);
318		fputs(buf, stdout);
319		free(buf);
320	} else {
321		int             i;
322
323		printf("Group Name: %-15s   #%lu\n"
324		       "   Members: ",
325		       grp->gr_name, (long) grp->gr_gid);
326		for (i = 0; grp->gr_mem[i]; i++)
327			printf("%s%s", i ? "," : "", grp->gr_mem[i]);
328		fputs("\n\n", stdout);
329	}
330	return EXIT_SUCCESS;
331}
332