summaryrefslogtreecommitdiffstats
path: root/usr.sbin/pw/pw_group.c
blob: 3259412208fc69f959983fb20cbf172ada62c8a8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
/*-
 * Copyright (C) 1996
 *	David L. Nugent.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char rcsid[] =
  "$FreeBSD$";
#endif /* not lint */

#include <ctype.h>
#include <err.h>
#include <termios.h>
#include <stdbool.h>
#include <unistd.h>
#include <grp.h>
#include <libutil.h>

#include "pw.h"
#include "bitmap.h"


static struct passwd *lookup_pwent(const char *user);
static void	delete_members(char ***members, int *grmembers, int *i,
    struct carg *arg, struct group *grp);
static int      print_group(struct group * grp, int pretty);
static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);

int
pw_group(struct userconf * cnf, int mode, struct cargs * args)
{
	int		rc;
	struct carg    *a_name = getarg(args, 'n');
	struct carg    *a_gid = getarg(args, 'g');
	struct carg    *arg;
	struct group   *grp = NULL;
	int	        grmembers = 0;
	char           **members = NULL;

	static struct group fakegroup =
	{
		"nogroup",
		"*",
		-1,
		NULL
	};

	if (mode == M_LOCK || mode == M_UNLOCK)
		errx(EX_USAGE, "'lock' command is not available for groups");

	/*
	 * With M_NEXT, we only need to return the
	 * next gid to stdout
	 */
	if (mode == M_NEXT) {
		gid_t next = gr_gidpolicy(cnf, args);
		if (getarg(args, 'q'))
			return next;
		printf("%ld\n", (long)next);
		return EXIT_SUCCESS;
	}

	if (mode == M_PRINT && getarg(args, 'a')) {
		int             pretty = getarg(args, 'P') != NULL;

		SETGRENT();
		while ((grp = GETGRENT()) != NULL)
			print_group(grp, pretty);
		ENDGRENT();
		return EXIT_SUCCESS;
	}
	if (a_gid == NULL) {
		if (a_name == NULL)
			errx(EX_DATAERR, "group name or id required");

		if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) {
			(a_gid = a_name)->ch = 'g';
			a_name = NULL;
		}
	}
	grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));

	if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
		if (a_name == NULL && grp == NULL)	/* Try harder */
			grp = GETGRGID(atoi(a_gid->val));

		if (grp == NULL) {
			if (mode == M_PRINT && getarg(args, 'F')) {
				char	*fmems[1];
				fmems[0] = NULL;
				fakegroup.gr_name = a_name ? a_name->val : "nogroup";
				fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
				fakegroup.gr_mem = fmems;
				return print_group(&fakegroup, getarg(args, 'P') != NULL);
			}
			errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
		}
		if (a_name == NULL)	/* Needed later */
			a_name = addarg(args, 'n', grp->gr_name);

		/*
		 * Handle deletions now
		 */
		if (mode == M_DELETE) {
			gid_t           gid = grp->gr_gid;

			rc = delgrent(grp);
			if (rc == -1)
				err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
			else if (rc != 0) {
				warn("group update");
				return EX_IOERR;
			}
			pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
			return EXIT_SUCCESS;
		} else if (mode == M_PRINT)
			return print_group(grp, getarg(args, 'P') != NULL);

		if (a_gid)
			grp->gr_gid = (gid_t) atoi(a_gid->val);

		if ((arg = getarg(args, 'l')) != NULL)
			grp->gr_name = pw_checkname((u_char *)arg->val, 0);
	} else {
		if (a_name == NULL)	/* Required */
			errx(EX_DATAERR, "group name required");
		else if (grp != NULL)	/* Exists */
			errx(EX_DATAERR, "group name `%s' already exists", a_name->val);

		extendarray(&members, &grmembers, 200);
		members[0] = NULL;
		grp = &fakegroup;
		grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
		grp->gr_passwd = "*";
		grp->gr_gid = gr_gidpolicy(cnf, args);
		grp->gr_mem = members;
	}

	/*
	 * This allows us to set a group password Group passwords is an
	 * antique idea, rarely used and insecure (no secure database) Should
	 * be discouraged, but it is apparently still supported by some
	 * software.
	 */

	if ((arg = getarg(args, 'h')) != NULL ||
	    (arg = getarg(args, 'H')) != NULL) {
		if (strcmp(arg->val, "-") == 0)
			grp->gr_passwd = "*";	/* No access */
		else {
			int             fd = atoi(arg->val);
			int		precrypt = (arg->ch == 'H');
			int             b;
			int             istty = isatty(fd);
			struct termios  t;
			char           *p, line[256];

			if (istty) {
				if (tcgetattr(fd, &t) == -1)
					istty = 0;
				else {
					struct termios  n = t;

					/* Disable echo */
					n.c_lflag &= ~(ECHO);
					tcsetattr(fd, TCSANOW, &n);
					printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
					fflush(stdout);
				}
			}
			b = read(fd, line, sizeof(line) - 1);
			if (istty) {	/* Restore state */
				tcsetattr(fd, TCSANOW, &t);
				fputc('\n', stdout);
				fflush(stdout);
			}
			if (b < 0) {
				warn("-h file descriptor");
				return EX_OSERR;
			}
			line[b] = '\0';
			if ((p = strpbrk(line, " \t\r\n")) != NULL)
				*p = '\0';
			if (!*line)
				errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
			if (precrypt) {
				if (strchr(line, ':') != NULL)
					return EX_DATAERR;
				grp->gr_passwd = line;
			} else
				grp->gr_passwd = pw_pwcrypt(line);
		}
	}

	if (((arg = getarg(args, 'M')) != NULL ||
	    (arg = getarg(args, 'd')) != NULL ||
	    (arg = getarg(args, 'm')) != NULL) && arg->val) {
		int	i = 0;
		char   *p;
		struct passwd	*pwd;

		/* Make sure this is not stay NULL with -M "" */
		extendarray(&members, &grmembers, 200);
		if (arg->ch == 'd')
			delete_members(&members, &grmembers, &i, arg, grp);
		else if (arg->ch == 'm') {
			int	k = 0;

			while (grp->gr_mem[k] != NULL) {
				if (extendarray(&members, &grmembers, i + 2) != -1)
					members[i++] = grp->gr_mem[k];
				k++;
			}
		}

		if (arg->ch != 'd')
			for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
				int	j;

				/*
				 * Check for duplicates
				 */
				pwd = lookup_pwent(p);
				for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++)
					;
				if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
					members[i++] = newstr(pwd->pw_name);
			}
		while (i < grmembers)
			members[i++] = NULL;
		grp->gr_mem = members;
	}

	if (getarg(args, 'N') != NULL)
		return print_group(grp, getarg(args, 'P') != NULL);

	if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
		if (rc == -1)
			warnx("group '%s' already exists", grp->gr_name);
		else
			warn("group update");
		return EX_IOERR;
	} else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
		if (rc == -1)
			warnx("group '%s' not available (NIS?)", grp->gr_name);
		else
			warn("group update");
		return EX_IOERR;
	}
	/* grp may have been invalidated */
	if ((grp = GETGRNAM(a_name->val)) == NULL)
		errx(EX_SOFTWARE, "group disappeared during update");

	pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);

	free(members);

	return EXIT_SUCCESS;
}


/*
 * Lookup a passwd entry using a name or UID.
 */
static struct passwd *
lookup_pwent(const char *user)
{
	struct passwd *pwd;

	if ((pwd = GETPWNAM(user)) == NULL &&
	    (!isdigit((unsigned char)*user) ||
	    (pwd = getpwuid((uid_t) atoi(user))) == NULL))
		errx(EX_NOUSER, "user `%s' does not exist", user);

	return (pwd);
}


/*
 * Delete requested members from a group.
 */
static void
delete_members(char ***members, int *grmembers, int *i, struct carg *arg,
    struct group *grp)
{
	bool matchFound;
	char *user;
	char *valueCopy;
	char *valuePtr;
	int k;
	struct passwd *pwd;

	k = 0;
	while (grp->gr_mem[k] != NULL) {
		matchFound = false;
		if ((valueCopy = strdup(arg->val)) == NULL)
			errx(EX_UNAVAILABLE, "out of memory");
		valuePtr = valueCopy;
		while ((user = strsep(&valuePtr, ", \t")) != NULL) {
			pwd = lookup_pwent(user);
			if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) {
				matchFound = true;
				break;
			}
		}
		free(valueCopy);

		if (!matchFound &&
		    extendarray(members, grmembers, *i + 2) != -1)
			(*members)[(*i)++] = grp->gr_mem[k];

		k++;
	}

	return;
}


static          gid_t
gr_gidpolicy(struct userconf * cnf, struct cargs * args)
{
	struct group   *grp;
	gid_t           gid = (gid_t) - 1;
	struct carg    *a_gid = getarg(args, 'g');

	/*
	 * Check the given gid, if any
	 */
	if (a_gid != NULL) {
		gid = (gid_t) atol(a_gid->val);

		if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
			errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
	} else {
		struct bitmap   bm;

		/*
		 * We need to allocate the next available gid under one of
		 * two policies a) Grab the first unused gid b) Grab the
		 * highest possible unused gid
		 */
		if (cnf->min_gid >= cnf->max_gid) {	/* Sanity claus^H^H^H^Hheck */
			cnf->min_gid = 1000;
			cnf->max_gid = 32000;
		}
		bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);

		/*
		 * Now, let's fill the bitmap from the password file
		 */
		SETGRENT();
		while ((grp = GETGRENT()) != NULL)
			if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
                            (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
				bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
		ENDGRENT();

		/*
		 * Then apply the policy, with fallback to reuse if necessary
		 */
		if (cnf->reuse_gids)
			gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
		else {
			gid = (gid_t) (bm_lastset(&bm) + 1);
			if (!bm_isset(&bm, gid))
				gid += cnf->min_gid;
			else
				gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
		}

		/*
		 * Another sanity check
		 */
		if (gid < cnf->min_gid || gid > cnf->max_gid)
			errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
		bm_dealloc(&bm);
	}
	return gid;
}


static int
print_group(struct group * grp, int pretty)
{
	if (!pretty) {
		char           *buf = NULL;

		buf = gr_make(grp);
		printf("%s\n", buf);
		free(buf);
	} else {
		int             i;

		printf("Group Name: %-15s   #%lu\n"
		       "   Members: ",
		       grp->gr_name, (long) grp->gr_gid);
		for (i = 0; grp->gr_mem[i]; i++)
			printf("%s%s", i ? "," : "", grp->gr_mem[i]);
		fputs("\n\n", stdout);
	}
	return EXIT_SUCCESS;
}
OpenPOWER on IntegriCloud