pw_conf.c revision 286155 
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_conf.c 286155 2015-08-01 11:52:48Z bapt $";
30#endif /* not lint */
31
32#include <sys/types.h>
33#include <sys/sbuf.h>
34#include <inttypes.h>
35#include <string.h>
36#include <ctype.h>
37#include <fcntl.h>
38#include <err.h>
39
40#include "pw.h"
41
42#define debugging 0
43
44enum {
45	_UC_NONE,
46	_UC_DEFAULTPWD,
47	_UC_REUSEUID,
48	_UC_REUSEGID,
49	_UC_NISPASSWD,
50	_UC_DOTDIR,
51	_UC_NEWMAIL,
52	_UC_LOGFILE,
53	_UC_HOMEROOT,
54	_UC_HOMEMODE,
55	_UC_SHELLPATH,
56	_UC_SHELLS,
57	_UC_DEFAULTSHELL,
58	_UC_DEFAULTGROUP,
59	_UC_EXTRAGROUPS,
60	_UC_DEFAULTCLASS,
61	_UC_MINUID,
62	_UC_MAXUID,
63	_UC_MINGID,
64	_UC_MAXGID,
65	_UC_EXPIRE,
66	_UC_PASSWORD,
67	_UC_FIELDS
68};
69
70static char     bourne_shell[] = "sh";
71
72static char    *system_shells[_UC_MAXSHELLS] =
73{
74	bourne_shell,
75	"csh",
76	"tcsh"
77};
78
79static char const *booltrue[] =
80{
81	"yes", "true", "1", "on", NULL
82};
83static char const *boolfalse[] =
84{
85	"no", "false", "0", "off", NULL
86};
87
88static struct userconf config =
89{
90	0,			/* Default password for new users? (nologin) */
91	0,			/* Reuse uids? */
92	0,			/* Reuse gids? */
93	NULL,			/* NIS version of the passwd file */
94	"/usr/share/skel",	/* Where to obtain skeleton files */
95	NULL,			/* Mail to send to new accounts */
96	"/var/log/userlog",	/* Where to log changes */
97	"/home",		/* Where to create home directory */
98	_DEF_DIRMODE,		/* Home directory perms, modified by umask */
99	"/bin",			/* Where shells are located */
100	system_shells,		/* List of shells (first is default) */
101	bourne_shell,		/* Default shell */
102	NULL,			/* Default group name */
103	NULL,			/* Default (additional) groups */
104	NULL,			/* Default login class */
105	1000, 32000,		/* Allowed range of uids */
106	1000, 32000,		/* Allowed range of gids */
107	0,			/* Days until account expires */
108	0			/* Days until password expires */
109};
110
111static char const *comments[_UC_FIELDS] =
112{
113	"#\n# pw.conf - user/group configuration defaults\n#\n",
114	"\n# Password for new users? no=nologin yes=loginid none=blank random=random\n",
115	"\n# Reuse gaps in uid sequence? (yes or no)\n",
116	"\n# Reuse gaps in gid sequence? (yes or no)\n",
117	"\n# Path to the NIS passwd file (blank or 'no' for none)\n",
118	"\n# Obtain default dotfiles from this directory\n",
119	"\n# Mail this file to new user (/etc/newuser.msg or no)\n",
120	"\n# Log add/change/remove information in this file\n",
121	"\n# Root directory in which $HOME directory is created\n",
122	"\n# Mode for the new $HOME directory, will be modified by umask\n",
123	"\n# Colon separated list of directories containing valid shells\n",
124	"\n# Comma separated list of available shells (without paths)\n",
125	"\n# Default shell (without path)\n",
126	"\n# Default group (leave blank for new group per user)\n",
127	"\n# Extra groups for new users\n",
128	"\n# Default login class for new users\n",
129	"\n# Range of valid default user ids\n",
130	NULL,
131	"\n# Range of valid default group ids\n",
132	NULL,
133	"\n# Days after which account expires (0=disabled)\n",
134	"\n# Days after which password expires (0=disabled)\n"
135};
136
137static char const *kwds[] =
138{
139	"",
140	"defaultpasswd",
141	"reuseuids",
142	"reusegids",
143	"nispasswd",
144	"skeleton",
145	"newmail",
146	"logfile",
147	"home",
148	"homemode",
149	"shellpath",
150	"shells",
151	"defaultshell",
152	"defaultgroup",
153	"extragroups",
154	"defaultclass",
155	"minuid",
156	"maxuid",
157	"mingid",
158	"maxgid",
159	"expire_days",
160	"password_days",
161	NULL
162};
163
164static char    *
165unquote(char const * str)
166{
167	if (str && (*str == '"' || *str == '\'')) {
168		char           *p = strchr(str + 1, *str);
169
170		if (p != NULL)
171			*p = '\0';
172		return (char *) (*++str ? str : NULL);
173	}
174	return (char *) str;
175}
176
177int
178boolean_val(char const * str, int dflt)
179{
180	if ((str = unquote(str)) != NULL) {
181		int             i;
182
183		for (i = 0; booltrue[i]; i++)
184			if (strcmp(str, booltrue[i]) == 0)
185				return 1;
186		for (i = 0; boolfalse[i]; i++)
187			if (strcmp(str, boolfalse[i]) == 0)
188				return 0;
189
190		/*
191		 * Special cases for defaultpassword
192		 */
193		if (strcmp(str, "random") == 0)
194			return -1;
195		if (strcmp(str, "none") == 0)
196			return -2;
197	}
198	return dflt;
199}
200
201char const     *
202boolean_str(int val)
203{
204	if (val == -1)
205		return "random";
206	else if (val == -2)
207		return "none";
208	else
209		return val ? booltrue[0] : boolfalse[0];
210}
211
212char           *
213newstr(char const * p)
214{
215	char	*q;
216
217	if ((p = unquote(p)) == NULL)
218		return (NULL);
219
220	if ((q = strdup(p)) == NULL)
221		err(1, "strdup()");
222
223	return (q);
224}
225
226struct userconf *
227read_userconfig(char const * file)
228{
229	FILE	*fp;
230	char	*buf, *p;
231	const char *errstr;
232	size_t	linecap;
233	ssize_t	linelen;
234
235	buf = NULL;
236	linecap = 0;
237
238	config.groups = sl_init();
239	if (config.groups == NULL)
240		err(1, "sl_init()");
241	if (file == NULL)
242		file = _PATH_PW_CONF;
243
244	if ((fp = fopen(file, "r")) == NULL)
245		return (&config);
246
247	while ((linelen = getline(&buf, &linecap, fp)) > 0) {
248		if (*buf && (p = strtok(buf, " \t\r\n=")) != NULL && *p != '#') {
249			static char const toks[] = " \t\r\n,=";
250			char           *q = strtok(NULL, toks);
251			int             i = 0;
252			mode_t          *modeset;
253
254			while (i < _UC_FIELDS && strcmp(p, kwds[i]) != 0)
255				++i;
256#if debugging
257			if (i == _UC_FIELDS)
258				printf("Got unknown kwd `%s' val=`%s'\n", p, q ? q : "");
259			else
260				printf("Got kwd[%s]=%s\n", p, q);
261#endif
262			switch (i) {
263			case _UC_DEFAULTPWD:
264				config.default_password = boolean_val(q, 1);
265				break;
266			case _UC_REUSEUID:
267				config.reuse_uids = boolean_val(q, 0);
268				break;
269			case _UC_REUSEGID:
270				config.reuse_gids = boolean_val(q, 0);
271				break;
272			case _UC_NISPASSWD:
273				config.nispasswd = (q == NULL || !boolean_val(q, 1))
274					? NULL : newstr(q);
275				break;
276			case _UC_DOTDIR:
277				config.dotdir = (q == NULL || !boolean_val(q, 1))
278					? NULL : newstr(q);
279				break;
280				case _UC_NEWMAIL:
281				config.newmail = (q == NULL || !boolean_val(q, 1))
282					? NULL : newstr(q);
283				break;
284			case _UC_LOGFILE:
285				config.logfile = (q == NULL || !boolean_val(q, 1))
286					? NULL : newstr(q);
287				break;
288			case _UC_HOMEROOT:
289				config.home = (q == NULL || !boolean_val(q, 1))
290					? "/home" : newstr(q);
291				break;
292			case _UC_HOMEMODE:
293				modeset = setmode(q);
294				config.homemode = (q == NULL || !boolean_val(q, 1))
295					? _DEF_DIRMODE : getmode(modeset, _DEF_DIRMODE);
296				free(modeset);
297				break;
298			case _UC_SHELLPATH:
299				config.shelldir = (q == NULL || !boolean_val(q, 1))
300					? "/bin" : newstr(q);
301				break;
302			case _UC_SHELLS:
303				for (i = 0; i < _UC_MAXSHELLS && q != NULL; i++, q = strtok(NULL, toks))
304					system_shells[i] = newstr(q);
305				if (i > 0)
306					while (i < _UC_MAXSHELLS)
307						system_shells[i++] = NULL;
308				break;
309			case _UC_DEFAULTSHELL:
310				config.shell_default = (q == NULL || !boolean_val(q, 1))
311					? (char *) bourne_shell : newstr(q);
312				break;
313			case _UC_DEFAULTGROUP:
314				q = unquote(q);
315				config.default_group = (q == NULL || !boolean_val(q, 1) || GETGRNAM(q) == NULL)
316					? NULL : newstr(q);
317				break;
318			case _UC_EXTRAGROUPS:
319				for (i = 0; q != NULL; q = strtok(NULL, toks))
320					sl_add(config.groups, newstr(q));
321				break;
322			case _UC_DEFAULTCLASS:
323				config.default_class = (q == NULL || !boolean_val(q, 1))
324					? NULL : newstr(q);
325				break;
326			case _UC_MINUID:
327				if ((q = unquote(q)) != NULL) {
328					config.min_uid = strtounum(q, 0,
329					    UID_MAX, &errstr);
330					if (errstr)
331						warnx("Invalid min_uid: '%s';"
332						    " ignoring", q);
333				}
334				break;
335			case _UC_MAXUID:
336				if ((q = unquote(q)) != NULL) {
337					config.max_uid = strtounum(q, 0,
338					    UID_MAX, &errstr);
339					if (errstr)
340						warnx("Invalid max_uid: '%s';"
341						    " ignoring", q);
342				}
343				break;
344			case _UC_MINGID:
345				if ((q = unquote(q)) != NULL) {
346					config.min_gid = strtounum(q, 0,
347					    GID_MAX, &errstr);
348					if (errstr)
349						warnx("Invalid min_gid: '%s';"
350						    " ignoring", q);
351				}
352				break;
353			case _UC_MAXGID:
354				if ((q = unquote(q)) != NULL) {
355					config.max_gid = strtounum(q, 0,
356					    GID_MAX, &errstr);
357					if (errstr)
358						warnx("Invalid max_gid: '%s';"
359						    " ignoring", q);
360				}
361				break;
362			case _UC_EXPIRE:
363				if ((q = unquote(q)) != NULL) {
364					config.expire_days = strtonum(q, 0,
365					    INT_MAX, &errstr);
366					if (errstr)
367						warnx("Invalid expire days:"
368						    " '%s'; ignoring", q);
369				}
370				break;
371			case _UC_PASSWORD:
372				if ((q = unquote(q)) != NULL) {
373					config.password_days = strtonum(q, 0,
374					    INT_MAX, &errstr);
375					if (errstr)
376						warnx("Invalid password days:"
377						    " '%s'; ignoring", q);
378				}
379				break;
380			case _UC_FIELDS:
381			case _UC_NONE:
382				break;
383			}
384		}
385	}
386	free(buf);
387	fclose(fp);
388
389	return (&config);
390}
391
392
393int
394write_userconfig(char const * file)
395{
396	int             fd;
397	int             i, j;
398	struct sbuf	*buf;
399	FILE           *fp;
400
401	if (file == NULL)
402		file = _PATH_PW_CONF;
403
404	if ((fd = open(file, O_CREAT|O_RDWR|O_TRUNC|O_EXLOCK, 0644)) == -1)
405		return (0);
406
407	if ((fp = fdopen(fd, "w")) == NULL) {
408		close(fd);
409		return (0);
410	}
411
412	buf = sbuf_new_auto();
413	for (i = _UC_NONE; i < _UC_FIELDS; i++) {
414		int             quote = 1;
415
416		sbuf_clear(buf);
417		switch (i) {
418		case _UC_DEFAULTPWD:
419			sbuf_cat(buf, boolean_str(config.default_password));
420			break;
421		case _UC_REUSEUID:
422			sbuf_cat(buf, boolean_str(config.reuse_uids));
423			break;
424		case _UC_REUSEGID:
425			sbuf_cat(buf, boolean_str(config.reuse_gids));
426			break;
427		case _UC_NISPASSWD:
428			sbuf_cat(buf, config.nispasswd ?  config.nispasswd :
429			    "");
430			quote = 0;
431			break;
432		case _UC_DOTDIR:
433			sbuf_cat(buf, config.dotdir ?  config.dotdir :
434			    boolean_str(0));
435			break;
436		case _UC_NEWMAIL:
437			sbuf_cat(buf, config.newmail ?  config.newmail :
438			    boolean_str(0));
439			break;
440		case _UC_LOGFILE:
441			sbuf_cat(buf, config.logfile ?  config.logfile :
442			    boolean_str(0));
443			break;
444		case _UC_HOMEROOT:
445			sbuf_cat(buf, config.home);
446			break;
447		case _UC_HOMEMODE:
448			sbuf_printf(buf, "%04o", config.homemode);
449			quote = 0;
450			break;
451		case _UC_SHELLPATH:
452			sbuf_cat(buf, config.shelldir);
453			break;
454		case _UC_SHELLS:
455			for (j = 0; j < _UC_MAXSHELLS &&
456			    system_shells[j] != NULL; j++)
457				sbuf_printf(buf, "%s\"%s\"", j ?
458				    "," : "", system_shells[j]);
459			quote = 0;
460			break;
461		case _UC_DEFAULTSHELL:
462			sbuf_cat(buf, config.shell_default ?
463			    config.shell_default : bourne_shell);
464			break;
465		case _UC_DEFAULTGROUP:
466			sbuf_cat(buf, config.default_group ?
467			    config.default_group : "");
468			break;
469		case _UC_EXTRAGROUPS:
470			for (j = 0; config.groups != NULL &&
471			    j < (int)config.groups->sl_cur; j++)
472				sbuf_printf(buf, "%s\"%s\"", j ?
473				    "," : "", config.groups->sl_str[j]);
474			quote = 0;
475			break;
476		case _UC_DEFAULTCLASS:
477			sbuf_cat(buf, config.default_class ?
478			    config.default_class : "");
479			break;
480		case _UC_MINUID:
481			sbuf_printf(buf, "%ju", (uintmax_t)config.min_uid);
482			quote = 0;
483			break;
484		case _UC_MAXUID:
485			sbuf_printf(buf, "%ju", (uintmax_t)config.max_uid);
486			quote = 0;
487			break;
488		case _UC_MINGID:
489			sbuf_printf(buf, "%ju", (uintmax_t)config.min_gid);
490			quote = 0;
491			break;
492		case _UC_MAXGID:
493			sbuf_printf(buf, "%ju", (uintmax_t)config.max_gid);
494			quote = 0;
495			break;
496		case _UC_EXPIRE:
497			sbuf_printf(buf, "%d", config.expire_days);
498			quote = 0;
499			break;
500		case _UC_PASSWORD:
501			sbuf_printf(buf, "%d", config.password_days);
502			quote = 0;
503			break;
504		case _UC_NONE:
505			break;
506		}
507		sbuf_finish(buf);
508
509		if (comments[i])
510			fputs(comments[i], fp);
511
512		if (*kwds[i]) {
513			if (quote)
514				fprintf(fp, "%s = \"%s\"\n", kwds[i],
515				    sbuf_data(buf));
516			else
517				fprintf(fp, "%s = %s\n", kwds[i], sbuf_data(buf));
518#if debugging
519			printf("WROTE: %s = %s\n", kwds[i], sbuf_data(buf));
520#endif
521		}
522	}
523	sbuf_delete(buf);
524	return (fclose(fp) != EOF);
525}
526