File: getdef.c

package info (click to toggle)
shadow 1:4.2-3+deb8u4
  • links: PTS, VCS
  • area: main
  • in suites: jessie
  • size: 13,868 kB
  • ctags: 2,298
  • sloc: ansic: 29,890; xml: 11,397; sh: 1,602; makefile: 1,271; yacc: 815; perl: 59
file content (516 lines) | stat: -rw-r--r-- 11,717 bytes parent folder | download | duplicates (2)
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
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
/*
 * Copyright (c) 1991 - 1994, Julianne Frances Haugh
 * Copyright (c) 1996 - 2000, Marek Michałkiewicz
 * Copyright (c) 2002 - 2006, Tomasz Kłoczko
 * Copyright (c) 2007 - 2008, Nicolas François
 * 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.
 * 3. The name of the copyright holders or contributors may not be used to
 *    endorse or promote products derived from this software without
 *    specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 THE COPYRIGHT
 * HOLDERS 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.
 */

#include <config.h>

#ident "$Id$"

#include "prototypes.h"
#include "defines.h"
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <errno.h>
#include "getdef.h"
/*
 * A configuration item definition.
 */
struct itemdef {
	/*@null@*/const char *name;	/* name of the item                     */
	/*@null@*/char *value;		/* value given, or NULL if no value     */
};

#define NUMDEFS	(sizeof(def_table)/sizeof(def_table[0]))
static struct itemdef def_table[] = {
	{"CHFN_RESTRICT", NULL},
	{"CONSOLE_GROUPS", NULL},
	{"CONSOLE", NULL},
	{"CREATE_HOME", NULL},
	{"DEFAULT_HOME", NULL},
	{"ENCRYPT_METHOD", NULL},
	{"ENV_PATH", NULL},
	{"ENV_SUPATH", NULL},
	{"ERASECHAR", NULL},
	{"FAILLOG_ENAB", NULL},
	{"FAKE_SHELL", NULL},
	{"FTMP_FILE", NULL},
	{"GID_MAX", NULL},
	{"GID_MIN", NULL},
	{"HUSHLOGIN_FILE", NULL},
	{"KILLCHAR", NULL},
	{"LOGIN_RETRIES", NULL},
	{"LOGIN_TIMEOUT", NULL},
	{"LOG_OK_LOGINS", NULL},
	{"LOG_UNKFAIL_ENAB", NULL},
	{"MAIL_DIR", NULL},
	{"MAIL_FILE", NULL},
	{"MAX_MEMBERS_PER_GROUP", NULL},
	{"MD5_CRYPT_ENAB", NULL},
	{"PASS_MAX_DAYS", NULL},
	{"PASS_MIN_DAYS", NULL},
	{"PASS_WARN_AGE", NULL},
#ifdef USE_SHA_CRYPT
	{"SHA_CRYPT_MAX_ROUNDS", NULL},
	{"SHA_CRYPT_MIN_ROUNDS", NULL},
#endif
	{"SUB_GID_COUNT", NULL},
	{"SUB_GID_MAX", NULL},
	{"SUB_GID_MIN", NULL},
	{"SUB_UID_COUNT", NULL},
	{"SUB_UID_MAX", NULL},
	{"SUB_UID_MIN", NULL},
	{"SULOG_FILE", NULL},
	{"SU_NAME", NULL},
	{"SYS_GID_MAX", NULL},
	{"SYS_GID_MIN", NULL},
	{"SYS_UID_MAX", NULL},
	{"SYS_UID_MIN", NULL},
	{"TTYGROUP", NULL},
	{"TTYPERM", NULL},
	{"TTYTYPE_FILE", NULL},
	{"UID_MAX", NULL},
	{"UID_MIN", NULL},
	{"UMASK", NULL},
	{"USERDEL_CMD", NULL},
	{"USERGROUPS_ENAB", NULL},
#ifndef USE_PAM
	{"CHFN_AUTH", NULL},
	{"CHSH_AUTH", NULL},
	{"CRACKLIB_DICTPATH", NULL},
	{"ENV_HZ", NULL},
	{"ENVIRON_FILE", NULL},
	{"ENV_TZ", NULL},
	{"FAIL_DELAY", NULL},
	{"ISSUE_FILE", NULL},
	{"LASTLOG_ENAB", NULL},
	{"LOGIN_STRING", NULL},
	{"MAIL_CHECK_ENAB", NULL},
	{"MOTD_FILE", NULL},
	{"NOLOGINS_FILE", NULL},
	{"OBSCURE_CHECKS_ENAB", NULL},
	{"PASS_ALWAYS_WARN", NULL},
	{"PASS_CHANGE_TRIES", NULL},
	{"PASS_MAX_LEN", NULL},
	{"PASS_MIN_LEN", NULL},
	{"PORTTIME_CHECKS_ENAB", NULL},
	{"QUOTAS_ENAB", NULL},
	{"SU_WHEEL_ONLY", NULL},
	{"ULIMIT", NULL},
#endif
#ifdef USE_SYSLOG
	{"SYSLOG_SG_ENAB", NULL},
	{"SYSLOG_SU_ENAB", NULL},
#endif
#ifdef WITH_TCB
	{"TCB_AUTH_GROUP", NULL},
	{"TCB_SYMLINKS", NULL},
	{"USE_TCB", NULL},
#endif
	{NULL, NULL}
};

#ifndef LOGINDEFS
#define LOGINDEFS "/etc/login.defs"
#endif

static char def_fname[] = LOGINDEFS;	/* login config defs file       */
static bool def_loaded = false;		/* are defs already loaded?     */

/* local function prototypes */
static /*@observer@*/ /*@null@*/struct itemdef *def_find (const char *);
static void def_load (void);


/*
 * getdef_str - get string value from table of definitions.
 *
 * Return point to static data for specified item, or NULL if item is not
 * defined.  First time invoked, will load definitions from the file.
 */

/*@observer@*/ /*@null@*/const char *getdef_str (const char *item)
{
	struct itemdef *d;

	if (!def_loaded) {
		def_load ();
	}

	d = def_find (item);
	return ((NULL == d)? (const char *) NULL : d->value);
}


/*
 * getdef_bool - get boolean value from table of definitions.
 *
 * Return TRUE if specified item is defined as "yes", else FALSE.
 */

bool getdef_bool (const char *item)
{
	struct itemdef *d;

	if (!def_loaded) {
		def_load ();
	}

	d = def_find (item);
	if ((NULL == d) || (NULL == d->value)) {
		return false;
	}

	return (strcasecmp (d->value, "yes") == 0);
}


/*
 * getdef_num - get numerical value from table of definitions
 *
 * Returns numeric value of specified item, else the "dflt" value if
 * the item is not defined.  Octal (leading "0") and hex (leading "0x")
 * values are handled.
 */

int getdef_num (const char *item, int dflt)
{
	struct itemdef *d;
	long val;

	if (!def_loaded) {
		def_load ();
	}

	d = def_find (item);
	if ((NULL == d) || (NULL == d->value)) {
		return dflt;
	}

	if (   (getlong (d->value, &val) == 0)
	    || (val > INT_MAX)
	    || (val < INT_MIN)) {
		fprintf (stderr,
		         _("configuration error - cannot parse %s value: '%s'"),
		         item, d->value);
		return dflt;
	}

	return (int) val;
}


/*
 * getdef_unum - get unsigned numerical value from table of definitions
 *
 * Returns numeric value of specified item, else the "dflt" value if
 * the item is not defined.  Octal (leading "0") and hex (leading "0x")
 * values are handled.
 */

unsigned int getdef_unum (const char *item, unsigned int dflt)
{
	struct itemdef *d;
	long val;

	if (!def_loaded) {
		def_load ();
	}

	d = def_find (item);
	if ((NULL == d) || (NULL == d->value)) {
		return dflt;
	}

	if (   (getlong (d->value, &val) == 0)
	    || (val < 0)
	    || (val > INT_MAX)) {
		fprintf (stderr,
		         _("configuration error - cannot parse %s value: '%s'"),
		         item, d->value);
		return dflt;
	}

	return (unsigned int) val;
}


/*
 * getdef_long - get long integer value from table of definitions
 *
 * Returns numeric value of specified item, else the "dflt" value if
 * the item is not defined.  Octal (leading "0") and hex (leading "0x")
 * values are handled.
 */

long getdef_long (const char *item, long dflt)
{
	struct itemdef *d;
	long val;

	if (!def_loaded) {
		def_load ();
	}

	d = def_find (item);
	if ((NULL == d) || (NULL == d->value)) {
		return dflt;
	}

	if (getlong (d->value, &val) == 0) {
		fprintf (stderr,
		         _("configuration error - cannot parse %s value: '%s'"),
		         item, d->value);
		return dflt;
	}

	return val;
}

/*
 * getdef_ulong - get unsigned long numerical value from table of definitions
 *
 * Returns numeric value of specified item, else the "dflt" value if
 * the item is not defined.  Octal (leading "0") and hex (leading "0x")
 * values are handled.
 */

unsigned long getdef_ulong (const char *item, unsigned long dflt)
{
	struct itemdef *d;
	unsigned long val;

	if (!def_loaded) {
		def_load ();
	}

	d = def_find (item);
	if ((NULL == d) || (NULL == d->value)) {
		return dflt;
	}

	if (getulong (d->value, &val) == 0) {
		/* FIXME: we should have a getulong */
		fprintf (stderr,
		         _("configuration error - cannot parse %s value: '%s'"),
		         item, d->value);
		return dflt;
	}

	return val;
}

/*
 * putdef_str - override the value read from /etc/login.defs
 * (also used when loading the initial defaults)
 */

int putdef_str (const char *name, const char *value)
{
	struct itemdef *d;
	char *cp;

	if (!def_loaded) {
		def_load ();
	}

	/*
	 * Locate the slot to save the value.  If this parameter
	 * is unknown then "def_find" will print an err message.
	 */
	d = def_find (name);
	if (NULL == d) {
		return -1;
	}

	/*
	 * Save off the value.
	 */
	cp = strdup (value);
	if (NULL == cp) {
		(void) fputs (_("Could not allocate space for config info.\n"),
		              stderr);
		SYSLOG ((LOG_ERR, "could not allocate space for config info"));
		return -1;
	}

	if (NULL != d->value) {
		free (d->value);
	}

	d->value = cp;
	return 0;
}


/*
 * def_find - locate named item in table
 *
 * Search through a table of configurable items to locate the
 * specified configuration option.
 */

static /*@observer@*/ /*@null@*/struct itemdef *def_find (const char *name)
{
	struct itemdef *ptr;


	/*
	 * Search into the table.
	 */

	for (ptr = def_table; NULL != ptr->name; ptr++) {
		if (strcmp (ptr->name, name) == 0) {
			return ptr;
		}
	}

	/*
	 * Item was never found.
	 */

	fprintf (stderr,
	         _("configuration error - unknown item '%s' (notify administrator)\n"),
	         name);
	SYSLOG ((LOG_CRIT, "unknown configuration item `%s'", name));
	return (struct itemdef *) NULL;
}

/*
 * def_load - load configuration table
 *
 * Loads the user-configured options from the default configuration file
 */

static void def_load (void)
{
	int i;
	FILE *fp;
	char buf[1024], *name, *value, *s;

	/*
	 * Open the configuration definitions file.
	 */
	fp = fopen (def_fname, "r");
	if (NULL == fp) {
		int err = errno;
		SYSLOG ((LOG_CRIT, "cannot open login definitions %s [%s]",
		         def_fname, strerror (err)));
		exit (EXIT_FAILURE);
	}

	/*
	 * Set the initialized flag.
	 * (do it early to prevent recursion in putdef_str())
	 */
	def_loaded = true;

	/*
	 * Go through all of the lines in the file.
	 */
	while (fgets (buf, (int) sizeof (buf), fp) != NULL) {

		/*
		 * Trim trailing whitespace.
		 */
		for (i = (int) strlen (buf) - 1; i >= 0; --i) {
			if (!isspace (buf[i])) {
				break;
			}
		}
		i++;
		buf[i] = '\0';

		/*
		 * Break the line into two fields.
		 */
		name = buf + strspn (buf, " \t");	/* first nonwhite */
		if (*name == '\0' || *name == '#')
			continue;	/* comment or empty */

		s = name + strcspn (name, " \t");	/* end of field */
		if (*s == '\0')
			continue;	/* only 1 field?? */

		*s++ = '\0';
		value = s + strspn (s, " \"\t");	/* next nonwhite */
		*(value + strcspn (value, "\"")) = '\0';

		/*
		 * Store the value in def_table.
		 *
		 * Ignore failures to load the login.defs file.
		 * The error was already reported to the user and to
		 * syslog. The tools will just use their default values.
		 */
		(void)putdef_str (name, value);
	}

	if (ferror (fp) != 0) {
		int err = errno;
		SYSLOG ((LOG_CRIT, "cannot read login definitions %s [%s]",
		         def_fname, strerror (err)));
		exit (EXIT_FAILURE);
	}

	(void) fclose (fp);
}


#ifdef CKDEFS
int main (int argc, char **argv)
{
	int i;
	char *cp;
	struct itemdef *d;

	def_load ();

	for (i = 0; i < NUMDEFS; ++i) {
		d = def_find (def_table[i].name);
		if (NULL == d) {
			printf ("error - lookup '%s' failed\n",
			        def_table[i].name);
		} else {
			printf ("%4d %-24s %s\n", i + 1, d->name, d->value);
		}
	}
	for (i = 1; i < argc; i++) {
		cp = getdef_str (argv[1]);
		if (NULL != cp) {
			printf ("%s `%s'\n", argv[1], cp);
		} else {
			printf ("%s not found\n", argv[1]);
		}
	}
	exit (EXIT_SUCCESS);
}
#endif