pw_group.c revision 30259 
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	"$Id$";
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#include "pwupd.h"
40
41
42static int      print_group(struct group * grp, int pretty);
43static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
44
45int
46pw_group(struct userconf * cnf, int mode, struct cargs * args)
47{
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			if (delgrent(grp) == -1)
121				err(EX_IOERR, "error updating group file");
122			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
123			return EXIT_SUCCESS;
124		} else if (mode == M_PRINT)
125			return print_group(grp, getarg(args, 'P') != NULL);
126
127		if (a_gid)
128			grp->gr_gid = (gid_t) atoi(a_gid->val);
129
130		if ((arg = getarg(args, 'l')) != NULL)
131			grp->gr_name = pw_checkname((u_char *)arg->val, 0);
132	} else {
133		if (a_name == NULL)	/* Required */
134			errx(EX_DATAERR, "group name required");
135		else if (grp != NULL)	/* Exists */
136			errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
137
138		extendarray(&members, &grmembers, 200);
139		members[0] = NULL;
140		grp = &fakegroup;
141		grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
142		grp->gr_passwd = "*";
143		grp->gr_gid = gr_gidpolicy(cnf, args);
144		grp->gr_mem = members;
145	}
146
147	/*
148	 * This allows us to set a group password Group passwords is an
149	 * antique idea, rarely used and insecure (no secure database) Should
150	 * be discouraged, but it is apparently still supported by some
151	 * software.
152	 */
153
154	if ((arg = getarg(args, 'h')) != NULL) {
155		if (strcmp(arg->val, "-") == 0)
156			grp->gr_passwd = "*";	/* No access */
157		else {
158			int             fd = atoi(arg->val);
159			int             b;
160			int             istty = isatty(fd);
161			struct termios  t;
162			char           *p, line[256];
163
164			if (istty) {
165				if (tcgetattr(fd, &t) == -1)
166					istty = 0;
167				else {
168					struct termios  n = t;
169
170					/* Disable echo */
171					n.c_lflag &= ~(ECHO);
172					tcsetattr(fd, TCSANOW, &n);
173					printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
174					fflush(stdout);
175				}
176			}
177			b = read(fd, line, sizeof(line) - 1);
178			if (istty) {	/* Restore state */
179				tcsetattr(fd, TCSANOW, &t);
180				fputc('\n', stdout);
181				fflush(stdout);
182			}
183			if (b < 0) {
184				warn("-h file descriptor");
185				return EX_OSERR;
186			}
187			line[b] = '\0';
188			if ((p = strpbrk(line, " \t\r\n")) != NULL)
189				*p = '\0';
190			if (!*line)
191				errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
192			grp->gr_passwd = pw_pwcrypt(line);
193		}
194	}
195
196	if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
197		int	i = 0;
198		char   *p;
199		struct passwd	*pwd;
200
201		/* Make sure this is not stay NULL with -M "" */
202		extendarray(&members, &grmembers, 200);
203		if (arg->ch == 'm') {
204			int	k = 0;
205
206			while (grp->gr_mem[k] != NULL) {
207				if (extendarray(&members, &grmembers, i + 2) != -1) {
208					members[i++] = grp->gr_mem[k];
209				}
210				k++;
211			}
212		}
213		for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
214			int     j;
215			if ((pwd = getpwnam(p)) == NULL) {
216				if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
217					errx(EX_NOUSER, "user `%s' does not exist", p);
218			}
219			/*
220			 * Check for duplicates
221			 */
222			for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
223				;
224			if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
225				members[i++] = newstr(pwd->pw_name);
226		}
227		while (i < grmembers)
228			members[i++] = NULL;
229		grp->gr_mem = members;
230	}
231
232	if (getarg(args, 'N') != NULL)
233		return print_group(grp, getarg(args, 'P') != NULL);
234
235	if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
236		warn("group update");
237		return EX_IOERR;
238	}
239	/* grp may have been invalidated */
240	if ((grp = getgrnam(a_name->val)) == NULL)
241		errx(EX_SOFTWARE, "group disappeared during update");
242
243	pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
244
245	if (members)
246		free(members);
247
248	return EXIT_SUCCESS;
249}
250
251
252static          gid_t
253gr_gidpolicy(struct userconf * cnf, struct cargs * args)
254{
255	struct group   *grp;
256	gid_t           gid = (gid_t) - 1;
257	struct carg    *a_gid = getarg(args, 'g');
258
259	/*
260	 * Check the given gid, if any
261	 */
262	if (a_gid != NULL) {
263		gid = (gid_t) atol(a_gid->val);
264
265		if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL)
266			errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
267	} else {
268		struct bitmap   bm;
269
270		/*
271		 * We need to allocate the next available gid under one of
272		 * two policies a) Grab the first unused gid b) Grab the
273		 * highest possible unused gid
274		 */
275		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
276			cnf->min_gid = 1000;
277			cnf->max_gid = 32000;
278		}
279		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
280
281		/*
282		 * Now, let's fill the bitmap from the password file
283		 */
284		setgrent();
285		while ((grp = getgrent()) != NULL)
286			if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
287				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
288		endgrent();
289
290		/*
291		 * Then apply the policy, with fallback to reuse if necessary
292		 */
293		if (cnf->reuse_gids)
294			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
295		else {
296			gid = (gid_t) (bm_lastset(&bm) + 1);
297			if (!bm_isset(&bm, gid))
298				gid += cnf->min_gid;
299			else
300				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
301		}
302
303		/*
304		 * Another sanity check
305		 */
306		if (gid < cnf->min_gid || gid > cnf->max_gid)
307			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
308		bm_dealloc(&bm);
309	}
310	return gid;
311}
312
313
314static int
315print_group(struct group * grp, int pretty)
316{
317	if (!pretty) {
318		int		buflen = 0;
319		char           *buf = NULL;
320
321		fmtgrent(&buf, &buflen, grp);
322		fputs(buf, stdout);
323		free(buf);
324	} else {
325		int             i;
326
327		printf("Group Name: %-15s   #%lu\n"
328		       "   Members: ",
329		       grp->gr_name, (long) grp->gr_gid);
330		for (i = 0; grp->gr_mem[i]; i++)
331			printf("%s%s", i ? "," : "", grp->gr_mem[i]);
332		fputs("\n\n", stdout);
333	}
334	return EXIT_SUCCESS;
335}
336