pw_conf.c revision 286151 
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 286151 2015-08-01 10:10:13Z 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	size_t	linecap;
232	ssize_t	linelen;
233	const char *errstr;
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					errstr = NULL;
329					config.min_uid = strtounum(q, 0, UID_MAX, &errstr);
330					if (errstr)
331						warnx("Invalid min_uid: '%s', ignoring", q);
332				}
333				break;
334			case _UC_MAXUID:
335				if ((q = unquote(q)) != NULL) {
336					errstr = NULL;
337					config.max_uid = strtounum(q, 0, UID_MAX, &errstr);
338					if (errstr)
339						warnx("Invalid max_uid: '%s', ignoring", q);
340				}
341				break;
342			case _UC_MINGID:
343				if ((q = unquote(q)) != NULL && isdigit(*q))
344					errstr = NULL;
345					config.min_gid = strtounum(q, 0, GID_MAX, &errstr);
346					if (errstr)
347						warnx("Invalid min_gid: '%s', ignoring", q);
348				break;
349			case _UC_MAXGID:
350				if ((q = unquote(q)) != NULL) {
351					errstr = NULL;
352					config.max_gid = strtounum(q, 0, GID_MAX, &errstr);
353					if (errstr)
354						warnx("Invalid max_gid: '%s', ignoring", q);
355				}
356				break;
357			case _UC_EXPIRE:
358				if ((q = unquote(q)) != NULL && isdigit(*q))
359					config.expire_days = atoi(q);
360				break;
361			case _UC_PASSWORD:
362				if ((q = unquote(q)) != NULL && isdigit(*q))
363					config.password_days = atoi(q);
364				break;
365			case _UC_FIELDS:
366			case _UC_NONE:
367				break;
368			}
369		}
370	}
371	free(buf);
372	fclose(fp);
373
374	return (&config);
375}
376
377
378int
379write_userconfig(char const * file)
380{
381	int             fd;
382	int             i, j;
383	struct sbuf	*buf;
384	FILE           *fp;
385
386	if (file == NULL)
387		file = _PATH_PW_CONF;
388
389	if ((fd = open(file, O_CREAT|O_RDWR|O_TRUNC|O_EXLOCK, 0644)) == -1)
390		return (0);
391
392	if ((fp = fdopen(fd, "w")) == NULL) {
393		close(fd);
394		return (0);
395	}
396
397	buf = sbuf_new_auto();
398	for (i = _UC_NONE; i < _UC_FIELDS; i++) {
399		int             quote = 1;
400
401		sbuf_clear(buf);
402		switch (i) {
403		case _UC_DEFAULTPWD:
404			sbuf_cat(buf, boolean_str(config.default_password));
405			break;
406		case _UC_REUSEUID:
407			sbuf_cat(buf, boolean_str(config.reuse_uids));
408			break;
409		case _UC_REUSEGID:
410			sbuf_cat(buf, boolean_str(config.reuse_gids));
411			break;
412		case _UC_NISPASSWD:
413			sbuf_cat(buf, config.nispasswd ?  config.nispasswd :
414			    "");
415			quote = 0;
416			break;
417		case _UC_DOTDIR:
418			sbuf_cat(buf, config.dotdir ?  config.dotdir :
419			    boolean_str(0));
420			break;
421		case _UC_NEWMAIL:
422			sbuf_cat(buf, config.newmail ?  config.newmail :
423			    boolean_str(0));
424			break;
425		case _UC_LOGFILE:
426			sbuf_cat(buf, config.logfile ?  config.logfile :
427			    boolean_str(0));
428			break;
429		case _UC_HOMEROOT:
430			sbuf_cat(buf, config.home);
431			break;
432		case _UC_HOMEMODE:
433			sbuf_printf(buf, "%04o", config.homemode);
434			quote = 0;
435			break;
436		case _UC_SHELLPATH:
437			sbuf_cat(buf, config.shelldir);
438			break;
439		case _UC_SHELLS:
440			for (j = 0; j < _UC_MAXSHELLS &&
441			    system_shells[j] != NULL; j++)
442				sbuf_printf(buf, "%s\"%s\"", j ?
443				    "," : "", system_shells[j]);
444			quote = 0;
445			break;
446		case _UC_DEFAULTSHELL:
447			sbuf_cat(buf, config.shell_default ?
448			    config.shell_default : bourne_shell);
449			break;
450		case _UC_DEFAULTGROUP:
451			sbuf_cat(buf, config.default_group ?
452			    config.default_group : "");
453			break;
454		case _UC_EXTRAGROUPS:
455			for (j = 0; config.groups != NULL &&
456			    j < (int)config.groups->sl_cur; j++)
457				sbuf_printf(buf, "%s\"%s\"", j ?
458				    "," : "", config.groups->sl_str[j]);
459			quote = 0;
460			break;
461		case _UC_DEFAULTCLASS:
462			sbuf_cat(buf, config.default_class ?
463			    config.default_class : "");
464			break;
465		case _UC_MINUID:
466			sbuf_printf(buf, "%ju", (uintmax_t)config.min_uid);
467			quote = 0;
468			break;
469		case _UC_MAXUID:
470			sbuf_printf(buf, "%ju", (uintmax_t)config.max_uid);
471			quote = 0;
472			break;
473		case _UC_MINGID:
474			sbuf_printf(buf, "%ju", (uintmax_t)config.min_gid);
475			quote = 0;
476			break;
477		case _UC_MAXGID:
478			sbuf_printf(buf, "%ju", (uintmax_t)config.max_gid);
479			quote = 0;
480			break;
481		case _UC_EXPIRE:
482			sbuf_printf(buf, "%d", config.expire_days);
483			quote = 0;
484			break;
485		case _UC_PASSWORD:
486			sbuf_printf(buf, "%d", config.password_days);
487			quote = 0;
488			break;
489		case _UC_NONE:
490			break;
491		}
492		sbuf_finish(buf);
493
494		if (comments[i])
495			fputs(comments[i], fp);
496
497		if (*kwds[i]) {
498			if (quote)
499				fprintf(fp, "%s = \"%s\"\n", kwds[i],
500				    sbuf_data(buf));
501			else
502				fprintf(fp, "%s = %s\n", kwds[i], sbuf_data(buf));
503#if debugging
504			printf("WROTE: %s = %s\n", kwds[i], sbuf_data(buf));
505#endif
506		}
507	}
508	sbuf_delete(buf);
509	return (fclose(fp) != EOF);
510}
511