GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libutil/passwd.c Lines: 0 237 0.0 %
Date: 2017-11-13 Branches: 0 197 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: passwd.c,v 1.54 2015/04/24 21:13:56 millert Exp $	*/
2
3
/*
4
 * Copyright (c) 1987, 1993, 1994, 1995
5
 *	The Regents of the University of California.  All rights reserved.
6
 *
7
 * Redistribution and use in source and binary forms, with or without
8
 * modification, are permitted provided that the following conditions
9
 * are met:
10
 * 1. Redistributions of source code must retain the above copyright
11
 *    notice, this list of conditions and the following disclaimer.
12
 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
14
 *    documentation and/or other materials provided with the distribution.
15
 * 3. Neither the name of the University nor the names of its contributors
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 *    may be used to endorse or promote products derived from this software
17
 *    without specific prior written permission.
18
 *
19
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
30
 */
31
32
#include <sys/types.h>
33
#include <sys/stat.h>
34
#include <sys/time.h>
35
#include <sys/resource.h>
36
#include <sys/wait.h>
37
38
#include <fcntl.h>
39
#include <unistd.h>
40
#include <stdlib.h>
41
#include <stdio.h>
42
#include <string.h>
43
#include <ctype.h>
44
#include <pwd.h>
45
#include <err.h>
46
#include <errno.h>
47
#include <paths.h>
48
#include <signal.h>
49
#include <limits.h>
50
51
#include "util.h"
52
53
static char pw_defdir[] = "/etc";
54
static char *pw_dir = pw_defdir;
55
static char *pw_lck;
56
57
char *
58
pw_file(const char *nm)
59
{
60
	const char *p = strrchr(nm, '/');
61
	char *new_nm;
62
63
	if (p)
64
		p++;
65
	else
66
		p = nm;
67
68
	if (asprintf(&new_nm, "%s/%s", pw_dir, p) == -1)
69
		return NULL;
70
	return new_nm;
71
}
72
73
void
74
pw_setdir(const char *dir)
75
{
76
	char *p;
77
78
	if (strcmp (dir, pw_dir) == 0)
79
		return;
80
	if (pw_dir != pw_defdir)
81
		free(pw_dir);
82
	pw_dir = strdup(dir);
83
	if (pw_lck) {
84
		p = pw_file(pw_lck);
85
		free(pw_lck);
86
		pw_lck = p;
87
	}
88
}
89
90
91
int
92
pw_lock(int retries)
93
{
94
	int i, fd;
95
	mode_t old_mode;
96
97
	if (!pw_lck) {
98
		errno = EINVAL;
99
		return (-1);
100
	}
101
	/* Acquire the lock file.  */
102
	old_mode = umask(0);
103
	fd = open(pw_lck, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0600);
104
	for (i = 0; i < retries && fd < 0 && errno == EEXIST; i++) {
105
		sleep(1);
106
		fd = open(pw_lck, O_WRONLY|O_CREAT|O_EXCL|O_CLOEXEC, 0600);
107
	}
108
	(void) umask(old_mode);
109
	return (fd);
110
}
111
112
int
113
pw_mkdb(char *username, int flags)
114
{
115
	int pstat, ac;
116
	pid_t pid;
117
	char *av[8];
118
	struct stat sb;
119
120
	if (pw_lck == NULL)
121
		return(-1);
122
123
	/* A zero length passwd file is never ok */
124
	if (stat(pw_lck, &sb) == 0 && sb.st_size == 0) {
125
		warnx("%s is zero length", pw_lck);
126
		return (-1);
127
	}
128
129
	ac = 0;
130
	av[ac++] = "pwd_mkdb";
131
	av[ac++] = "-d";
132
	av[ac++] = pw_dir;
133
	if (flags & _PASSWORD_SECUREONLY)
134
		av[ac++] = "-s";
135
	else if (!(flags & _PASSWORD_OMITV7))
136
		av[ac++] = "-p";
137
	if (username) {
138
		av[ac++] = "-u";
139
		av[ac++] = username;
140
	}
141
	av[ac++] = pw_lck;
142
	av[ac] = NULL;
143
144
	pid = vfork();
145
	if (pid == -1)
146
		return (-1);
147
	if (pid == 0) {
148
		if (pw_lck)
149
			execv(_PATH_PWD_MKDB, av);
150
		_exit(1);
151
	}
152
	pid = waitpid(pid, &pstat, 0);
153
	if (pid == -1 || !WIFEXITED(pstat) || WEXITSTATUS(pstat) != 0)
154
		return (-1);
155
	return (0);
156
}
157
158
int
159
pw_abort(void)
160
{
161
	return (pw_lck ? unlink(pw_lck) : -1);
162
}
163
164
/* Everything below this point is intended for the convenience of programs
165
 * which allow a user to interactively edit the passwd file.  Errors in the
166
 * routines below will cause the process to abort. */
167
168
static pid_t editpid = -1;
169
170
static void
171
pw_cont(int signo)
172
{
173
	int save_errno = errno;
174
175
	if (editpid != -1)
176
		kill(editpid, signo);
177
	errno = save_errno;
178
}
179
180
void
181
pw_init(void)
182
{
183
	struct rlimit rlim;
184
185
	/* Unlimited resource limits. */
186
	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
187
	(void)setrlimit(RLIMIT_CPU, &rlim);
188
	(void)setrlimit(RLIMIT_FSIZE, &rlim);
189
	(void)setrlimit(RLIMIT_STACK, &rlim);
190
	(void)setrlimit(RLIMIT_DATA, &rlim);
191
	(void)setrlimit(RLIMIT_RSS, &rlim);
192
193
	/* Don't drop core (not really necessary, but GP's). */
194
	rlim.rlim_cur = rlim.rlim_max = 0;
195
	(void)setrlimit(RLIMIT_CORE, &rlim);
196
197
	/* Turn off signals. */
198
	(void)signal(SIGALRM, SIG_IGN);
199
	(void)signal(SIGHUP, SIG_IGN);
200
	(void)signal(SIGINT, SIG_IGN);
201
	(void)signal(SIGPIPE, SIG_IGN);
202
	(void)signal(SIGQUIT, SIG_IGN);
203
	(void)signal(SIGTERM, SIG_IGN);
204
	(void)signal(SIGCONT, pw_cont);
205
206
	if (!pw_lck)
207
		pw_lck = pw_file(_PATH_MASTERPASSWD_LOCK);
208
}
209
210
void
211
pw_edit(int notsetuid, const char *filename)
212
{
213
	int pstat;
214
	char *p;
215
	char * volatile editor;
216
	char *argp[] = {"sh", "-c", NULL, NULL};
217
218
	if (!filename) {
219
		filename = pw_lck;
220
		if (!filename)
221
			return;
222
	}
223
224
	if ((editor = getenv("EDITOR")) == NULL)
225
		editor = _PATH_VI;
226
227
	if (asprintf(&p, "%s %s", editor, filename) == -1)
228
		return;
229
	argp[2] = p;
230
231
	switch (editpid = vfork()) {
232
	case -1:			/* error */
233
		free(p);
234
		return;
235
	case 0:				/* child */
236
		if (notsetuid) {
237
			setgid(getgid());
238
			setuid(getuid());
239
		}
240
		execv(_PATH_BSHELL, argp);
241
		_exit(127);
242
	}
243
244
	free(p);
245
	for (;;) {
246
		editpid = waitpid(editpid, (int *)&pstat, WUNTRACED);
247
		if (editpid == -1)
248
			pw_error(editor, 1, 1);
249
		else if (WIFSTOPPED(pstat))
250
			raise(WSTOPSIG(pstat));
251
		else if (WIFEXITED(pstat) && WEXITSTATUS(pstat) == 0)
252
			break;
253
		else
254
			pw_error(editor, 1, 1);
255
	}
256
	editpid = -1;
257
}
258
259
void
260
pw_prompt(void)
261
{
262
	int first, c;
263
264
	(void)printf("re-edit the password file? [y]: ");
265
	(void)fflush(stdout);
266
	first = c = getchar();
267
	while (c != '\n' && c != EOF)
268
		c = getchar();
269
	switch (first) {
270
	case EOF:
271
		putchar('\n');
272
		/* FALLTHROUGH */
273
	case 'n':
274
	case 'N':
275
		pw_error(NULL, 0, 0);
276
		break;
277
	}
278
}
279
280
static int
281
pw_equal(const struct passwd *pw1, const struct passwd *pw2)
282
{
283
	return (strcmp(pw1->pw_name, pw2->pw_name) == 0 &&
284
	    pw1->pw_uid == pw2->pw_uid &&
285
	    pw1->pw_gid == pw2->pw_gid &&
286
	    strcmp(pw1->pw_class, pw2->pw_class) == 0 &&
287
	    pw1->pw_change == pw2->pw_change &&
288
	    pw1->pw_expire == pw2->pw_expire &&
289
	    strcmp(pw1->pw_gecos, pw2->pw_gecos) == 0 &&
290
	    strcmp(pw1->pw_dir, pw2->pw_dir) == 0 &&
291
	    strcmp(pw1->pw_shell, pw2->pw_shell) == 0);
292
}
293
294
static int
295
pw_write_entry(FILE *to, const struct passwd *pw)
296
{
297
	char	gidstr[16], uidstr[16];
298
299
	/* Preserve gid/uid -1 */
300
	if (pw->pw_gid == (gid_t)-1)
301
		strlcpy(gidstr, "-1", sizeof(gidstr));
302
	else
303
		snprintf(gidstr, sizeof(gidstr), "%u", (u_int)pw->pw_gid);
304
305
	if (pw->pw_uid == (uid_t)-1)
306
		strlcpy(uidstr, "-1", sizeof(uidstr));
307
	else
308
		snprintf(uidstr, sizeof(uidstr), "%u", (u_int)pw->pw_uid);
309
310
	return fprintf(to, "%s:%s:%s:%s:%s:%lld:%lld:%s:%s:%s\n",
311
	    pw->pw_name, pw->pw_passwd, uidstr, gidstr, pw->pw_class,
312
	    (long long)pw->pw_change, (long long)pw->pw_expire,
313
	    pw->pw_gecos, pw->pw_dir, pw->pw_shell);
314
}
315
316
void
317
pw_copy(int ffd, int tfd, const struct passwd *pw, const struct passwd *opw)
318
{
319
	struct passwd tpw;
320
	FILE   *from, *to;
321
	int	done;
322
	char   *p, *ep, buf[8192];
323
	char   *master = pw_file(_PATH_MASTERPASSWD);
324
325
	if (!master)
326
		pw_error(NULL, 0, 1);
327
	if (!(from = fdopen(ffd, "r")))
328
		pw_error(master, 1, 1);
329
	if (!(to = fdopen(tfd, "w")))
330
		pw_error(pw_lck ? pw_lck : NULL, pw_lck ? 1 : 0, 1);
331
332
	for (done = 0; fgets(buf, (int)sizeof(buf), from);) {
333
		if ((ep = strchr(buf, '\n')) == NULL) {
334
			warnx("%s: line too long", master);
335
			pw_error(NULL, 0, 1);
336
		}
337
		if (done) {
338
			if (fputs(buf, to))
339
				goto fail;
340
			continue;
341
		}
342
		if (!(p = strchr(buf, ':'))) {
343
			warnx("%s: corrupted entry", master);
344
			pw_error(NULL, 0, 1);
345
		}
346
		*p = '\0';
347
		if (strcmp(buf, opw ? opw->pw_name : pw->pw_name)) {
348
			*p = ':';
349
			if (fputs(buf, to))
350
				goto fail;
351
			continue;
352
		}
353
		if (opw != NULL) {
354
			*p = ':';
355
			*ep = '\0';
356
			if (!pw_scan(buf, &tpw, NULL))
357
				pw_error(NULL, 0, 1);
358
			if (!pw_equal(&tpw, opw)) {
359
				warnx("%s: inconsistent entry", master);
360
				pw_error(NULL, 0, 1);
361
			}
362
		}
363
		if (pw_write_entry(to, pw) == -1)
364
			goto fail;
365
		done = 1;
366
	}
367
	if (!done && pw_write_entry(to, pw) == -1)
368
		goto fail;
369
370
	if (ferror(to) || fflush(to))
371
fail:
372
		pw_error(NULL, 0, 1);
373
	free(master);
374
	(void)fclose(to);
375
}
376
377
int
378
pw_scan(char *bp, struct passwd *pw, int *flags)
379
{
380
	int root;
381
	char *p, *sh;
382
	const char *errstr;
383
384
	if (flags != NULL)
385
		*flags = 0;
386
387
	if (!(p = strsep(&bp, ":")) || *p == '\0')	/* login */
388
		goto fmt;
389
	pw->pw_name = p;
390
	root = !strcmp(pw->pw_name, "root");
391
392
	if (!(pw->pw_passwd = strsep(&bp, ":")))	/* passwd */
393
		goto fmt;
394
395
	if (!(p = strsep(&bp, ":")))			/* uid */
396
		goto fmt;
397
	pw->pw_uid = strtonum(p, -1, UID_MAX, &errstr);
398
	if (errstr != NULL) {
399
		if (*p != '\0') {
400
			warnx("uid is %s", errstr);
401
			return (0);
402
		}
403
		if (flags != NULL)
404
			*flags |= _PASSWORD_NOUID;
405
	}
406
	if (root && pw->pw_uid) {
407
		warnx("root uid should be 0");
408
		return (0);
409
	}
410
411
	if (!(p = strsep(&bp, ":")))			/* gid */
412
		goto fmt;
413
	pw->pw_gid = strtonum(p, -1, GID_MAX, &errstr);
414
	if (errstr != NULL) {
415
		if (*p != '\0') {
416
			warnx("gid is %s", errstr);
417
			return (0);
418
		}
419
		if (flags != NULL)
420
			*flags |= _PASSWORD_NOGID;
421
	}
422
423
	pw->pw_class = strsep(&bp, ":");		/* class */
424
	if (!(p = strsep(&bp, ":")))			/* change */
425
		goto fmt;
426
	pw->pw_change = atoll(p);
427
	if ((*p == '\0') && (flags != (int *)NULL))
428
		*flags |= _PASSWORD_NOCHG;
429
	if (!(p = strsep(&bp, ":")))			/* expire */
430
		goto fmt;
431
	pw->pw_expire = atoll(p);
432
	if ((*p == '\0') && (flags != (int *)NULL))
433
		*flags |= _PASSWORD_NOEXP;
434
	pw->pw_gecos = strsep(&bp, ":");		/* gecos */
435
	pw->pw_dir = strsep(&bp, ":");			/* directory */
436
	if (!(pw->pw_shell = strsep(&bp, ":")))		/* shell */
437
		goto fmt;
438
439
	p = pw->pw_shell;
440
	if (root && *p) {				/* empty == /bin/sh */
441
		for (setusershell();;) {
442
			if (!(sh = getusershell())) {
443
				warnx("warning, unknown root shell");
444
				break;
445
			}
446
			if (!strcmp(p, sh))
447
				break;
448
		}
449
		endusershell();
450
	}
451
452
	if ((p = strsep(&bp, ":"))) {			/* too many */
453
fmt:		warnx("corrupted entry");
454
		return (0);
455
	}
456
457
	return (1);
458
}
459
460
__dead void
461
pw_error(const char *name, int error, int eval)
462
{
463
	char   *master = pw_file(_PATH_MASTERPASSWD);
464
465
	if (error) {
466
		if (name)
467
			warn("%s", name);
468
		else
469
			warn(NULL);
470
	}
471
	if (master) {
472
		warnx("%s: unchanged", master);
473
		free(master);
474
	}
475
476
	pw_abort();
477
	exit(eval);
478
}