pw_conf.c revision 283842 
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 283842 2015-05-31 22:07:03Z bapt $";
30#endif /* not lint */
31
32#include <sys/types.h>
33#include <sys/sbuf.h>
34#include <string.h>
35#include <ctype.h>
36#include <fcntl.h>
37#include <err.h>
38
39#include "pw.h"
40
41#define debugging 0
42
43enum {
44	_UC_NONE,
45	_UC_DEFAULTPWD,
46	_UC_REUSEUID,
47	_UC_REUSEGID,
48	_UC_NISPASSWD,
49	_UC_DOTDIR,
50	_UC_NEWMAIL,
51	_UC_LOGFILE,
52	_UC_HOMEROOT,
53	_UC_HOMEMODE,
54	_UC_SHELLPATH,
55	_UC_SHELLS,
56	_UC_DEFAULTSHELL,
57	_UC_DEFAULTGROUP,
58	_UC_EXTRAGROUPS,
59	_UC_DEFAULTCLASS,
60	_UC_MINUID,
61	_UC_MAXUID,
62	_UC_MINGID,
63	_UC_MAXGID,
64	_UC_EXPIRE,
65	_UC_PASSWORD,
66	_UC_FIELDS
67};
68
69static char     bourne_shell[] = "sh";
70
71static char    *system_shells[_UC_MAXSHELLS] =
72{
73	bourne_shell,
74	"csh",
75	"tcsh"
76};
77
78static char const *booltrue[] =
79{
80	"yes", "true", "1", "on", NULL
81};
82static char const *boolfalse[] =
83{
84	"no", "false", "0", "off", NULL
85};
86
87static struct userconf config =
88{
89	0,			/* Default password for new users? (nologin) */
90	0,			/* Reuse uids? */
91	0,			/* Reuse gids? */
92	NULL,			/* NIS version of the passwd file */
93	"/usr/share/skel",	/* Where to obtain skeleton files */
94	NULL,			/* Mail to send to new accounts */
95	"/var/log/userlog",	/* Where to log changes */
96	"/home",		/* Where to create home directory */
97	_DEF_DIRMODE,		/* Home directory perms, modified by umask */
98	"/bin",			/* Where shells are located */
99	system_shells,		/* List of shells (first is default) */
100	bourne_shell,		/* Default shell */
101	NULL,			/* Default group name */
102	NULL,			/* Default (additional) groups */
103	NULL,			/* Default login class */
104	1000, 32000,		/* Allowed range of uids */
105	1000, 32000,		/* Allowed range of gids */
106	0,			/* Days until account expires */
107	0,			/* Days until password expires */
108	0			/* size of default_group array */
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
234	buf = NULL;
235	linecap = 0;
236
237	config.numgroups = 200;
238	config.groups = calloc(config.numgroups, sizeof(char *));
239	if (config.groups == NULL)
240		err(1, "calloc()");
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					if (extendarray(&config.groups, &config.numgroups, i + 2) != -1)
321						config.groups[i++] = newstr(q);
322				}
323				if (i > 0)
324					while (i < config.numgroups)
325						config.groups[i++] = NULL;
326				break;
327			case _UC_DEFAULTCLASS:
328				config.default_class = (q == NULL || !boolean_val(q, 1))
329					? NULL : newstr(q);
330				break;
331			case _UC_MINUID:
332				if ((q = unquote(q)) != NULL && isdigit(*q))
333					config.min_uid = (uid_t) atol(q);
334				break;
335			case _UC_MAXUID:
336				if ((q = unquote(q)) != NULL && isdigit(*q))
337					config.max_uid = (uid_t) atol(q);
338				break;
339			case _UC_MINGID:
340				if ((q = unquote(q)) != NULL && isdigit(*q))
341					config.min_gid = (gid_t) atol(q);
342				break;
343			case _UC_MAXGID:
344				if ((q = unquote(q)) != NULL && isdigit(*q))
345					config.max_gid = (gid_t) atol(q);
346				break;
347			case _UC_EXPIRE:
348				if ((q = unquote(q)) != NULL && isdigit(*q))
349					config.expire_days = atoi(q);
350				break;
351			case _UC_PASSWORD:
352				if ((q = unquote(q)) != NULL && isdigit(*q))
353					config.password_days = atoi(q);
354				break;
355			case _UC_FIELDS:
356			case _UC_NONE:
357				break;
358			}
359		}
360	}
361	free(buf);
362	fclose(fp);
363
364	return (&config);
365}
366
367
368int
369write_userconfig(char const * file)
370{
371	int             fd;
372	int             i, j;
373	struct sbuf	*buf;
374	FILE           *fp;
375
376	if (file == NULL)
377		file = _PATH_PW_CONF;
378
379	if ((fd = open(file, O_CREAT|O_RDWR|O_TRUNC|O_EXLOCK, 0644)) == -1)
380		return (0);
381
382	if ((fp = fdopen(fd, "w")) == NULL) {
383		close(fd);
384		return (0);
385	}
386
387	buf = sbuf_new_auto();
388	for (i = _UC_NONE; i < _UC_FIELDS; i++) {
389		int             quote = 1;
390
391		sbuf_clear(buf);
392		switch (i) {
393		case _UC_DEFAULTPWD:
394			sbuf_cat(buf, boolean_str(config.default_password));
395			break;
396		case _UC_REUSEUID:
397			sbuf_cat(buf, boolean_str(config.reuse_uids));
398			break;
399		case _UC_REUSEGID:
400			sbuf_cat(buf, boolean_str(config.reuse_gids));
401			break;
402		case _UC_NISPASSWD:
403			sbuf_cat(buf, config.nispasswd ?  config.nispasswd :
404			    "");
405			quote = 0;
406			break;
407		case _UC_DOTDIR:
408			sbuf_cat(buf, config.dotdir ?  config.dotdir :
409			    boolean_str(0));
410			break;
411		case _UC_NEWMAIL:
412			sbuf_cat(buf, config.newmail ?  config.newmail :
413			    boolean_str(0));
414			break;
415		case _UC_LOGFILE:
416			sbuf_cat(buf, config.logfile ?  config.logfile :
417			    boolean_str(0));
418			break;
419		case _UC_HOMEROOT:
420			sbuf_cat(buf, config.home);
421			break;
422		case _UC_HOMEMODE:
423			sbuf_printf(buf, "%04o", config.homemode);
424			quote = 0;
425			break;
426		case _UC_SHELLPATH:
427			sbuf_cat(buf, config.shelldir);
428			break;
429		case _UC_SHELLS:
430			for (j = 0; j < _UC_MAXSHELLS &&
431			    system_shells[j] != NULL; j++)
432				sbuf_printf(buf, "%s\"%s\"", j ?
433				    "," : "", system_shells[j]);
434			quote = 0;
435			break;
436		case _UC_DEFAULTSHELL:
437			sbuf_cat(buf, config.shell_default ?
438			    config.shell_default : bourne_shell);
439			break;
440		case _UC_DEFAULTGROUP:
441			sbuf_cat(buf, config.default_group ?
442			    config.default_group : "");
443			break;
444		case _UC_EXTRAGROUPS:
445			for (j = 0; j < config.numgroups &&
446			    config.groups[j] != NULL; j++)
447				sbuf_printf(buf, "%s\"%s\"", j ?
448				    "," : "", config.groups[j]);
449			quote = 0;
450			break;
451		case _UC_DEFAULTCLASS:
452			sbuf_cat(buf, config.default_class ?
453			    config.default_class : "");
454			break;
455		case _UC_MINUID:
456			sbuf_printf(buf, "%u", config.min_uid);
457			quote = 0;
458			break;
459		case _UC_MAXUID:
460			sbuf_printf(buf, "%u", config.max_uid);
461			quote = 0;
462			break;
463		case _UC_MINGID:
464			sbuf_printf(buf, "%u", config.min_gid);
465			quote = 0;
466			break;
467		case _UC_MAXGID:
468			sbuf_printf(buf, "%u", config.max_gid);
469			quote = 0;
470			break;
471		case _UC_EXPIRE:
472			sbuf_printf(buf, "%d", config.expire_days);
473			quote = 0;
474			break;
475		case _UC_PASSWORD:
476			sbuf_printf(buf, "%d", config.password_days);
477			quote = 0;
478			break;
479		case _UC_NONE:
480			break;
481		}
482		sbuf_finish(buf);
483
484		if (comments[i])
485			fputs(comments[i], fp);
486
487		if (*kwds[i]) {
488			if (quote)
489				fprintf(fp, "%s = \"%s\"\n", kwds[i],
490				    sbuf_data(buf));
491			else
492				fprintf(fp, "%s = %s\n", kwds[i], sbuf_data(buf));
493#if debugging
494			printf("WROTE: %s = %s\n", kwds[i], sbuf_data(buf));
495#endif
496		}
497	}
498	sbuf_delete(buf);
499	return (fclose(fp) != EOF);
500}
501