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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/chpass/chpass.c	Lines:	0	106	0.0 %
Date:	2016-12-06	Branches:	0	67	0.0 %


/*	$OpenBSD: chpass.c,v 1.43 2015/11/26 19:01:47 deraadt Exp $	*/
/*	$NetBSD: chpass.c,v 1.8 1996/05/15 21:50:43 jtc Exp $	*/

/*-
 * Copyright (c) 1988, 1993, 1994
 *	The Regents of the University of California.  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. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 <sys/resource.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/uio.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

#include "chpass.h"

extern char *__progname;

enum { NEWSH, LOADENTRY, EDITENTRY } op;
uid_t uid;

void	baduser(void);
void	kbintr(int);
void	usage(void);

int
main(int argc, char *argv[])
{
	struct passwd *pw = NULL, *opw = NULL, lpw;
	int i, ch, pfd, tfd, dfd;
	char *tz, *arg = NULL;
	sigset_t fullset;

	/* We need to use the system timezone for date conversions. */
	if ((tz = getenv("TZ")) != NULL) {
	    unsetenv("TZ");
	    tzset();
	    setenv("TZ", tz, 1);
	}

	op = EDITENTRY;
	while ((ch = getopt(argc, argv, "a:s:")) != -1)
		switch(ch) {
		case 'a':
			op = LOADENTRY;
			arg = optarg;
			break;
		case 's':
			op = NEWSH;
			arg = optarg;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	uid = getuid();

	if (op == EDITENTRY || op == NEWSH)
		switch(argc) {
		case 0:
			pw = getpwuid_shadow(uid);
			if (!pw)
				errx(1, "unknown user: uid %u", uid);
			break;
		case 1:
			pw = getpwnam_shadow(*argv);
			if (!pw)
				errx(1, "unknown user: %s", *argv);
			if (uid && uid != pw->pw_uid)
				baduser();
			break;
		default:
			usage();
		}

	if (op == LOADENTRY) {
		if (argc != 0)
			errx(1, "option -a does not accept user argument");
		if (uid)
			baduser();
		pw = &lpw;
		if (!pw_scan(arg, pw, NULL))
			exit(1);
		opw = getpwnam_shadow(pw->pw_name);
	}
	if (opw == NULL && (opw = pw_dup(pw)) == NULL)
		err(1, NULL);

	/* Edit the user passwd information if requested. */
	if (op == EDITENTRY) {
		char tempname[] = _PATH_VARTMP "pw.XXXXXXXXXX";
		int edit_status;

		if ((pw = pw_dup(pw)) == NULL)
			pw_error(NULL, 1, 1);
		dfd = mkostemp(tempname, O_CLOEXEC);
		if (dfd == -1)
			pw_error(tempname, 1, 1);
		display(tempname, dfd, pw);

		if (pledge("stdio rpath wpath cpath id proc exec",
		    NULL) == -1)
			err(1, "pledge");

		edit_status = edit(tempname, pw);
		close(dfd);
		unlink(tempname);

		switch (edit_status) {
		case EDIT_OK:
			break;
		case EDIT_NOCHANGE:
			pw_error(NULL, 0, 0);
			break;
		case EDIT_ERROR:
		default:
			pw_error(tempname, 1, 1);
			break;
		}
	}

	if (op == NEWSH) {
		if (pledge("stdio rpath wpath cpath id proc exec",
		    NULL) == -1)
			err(1, "pledge");

		/* protect p_shell -- it thinks NULL is /bin/sh */
		if (!arg[0])
			usage();
		if (p_shell(arg, pw, NULL))
			pw_error(NULL, 0, 1);
	}

	/* Drop user's real uid and block all signals to avoid a DoS. */
	setuid(0);
	sigfillset(&fullset);
	sigdelset(&fullset, SIGINT);
	sigprocmask(SIG_BLOCK, &fullset, NULL);

	if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1)
		err(1, "pledge");

	/* Get the passwd lock file and open the passwd file for reading. */
	pw_init();
	for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
		if (i == 4)
			(void)fputs("Attempting to lock password file, "
			    "please wait or press ^C to abort", stderr);
		(void)signal(SIGINT, kbintr);
		if (i % 16 == 0)
			fputc('.', stderr);
		usleep(250000);
		(void)signal(SIGINT, SIG_IGN);
	}
	if (i >= 4)
		fputc('\n', stderr);
	pfd = open(_PATH_MASTERPASSWD, O_RDONLY|O_CLOEXEC, 0);
	if (pfd == -1)
		pw_error(_PATH_MASTERPASSWD, 1, 1);

	/* Copy the passwd file to the lock file, updating pw. */
	pw_copy(pfd, tfd, pw, opw);

	/* If username changed we need to rebuild the entire db. */
	arg = !strcmp(opw->pw_name, pw->pw_name) ? pw->pw_name : NULL;

	/* Now finish the passwd file update. */
	if (pw_mkdb(arg, 0) == -1)
		pw_error(NULL, 0, 1);
	exit(0);
}

void
baduser(void)
{

	errx(1, "%s", strerror(EACCES));
}

/* ARGSUSED */
void
kbintr(int signo)
{
	struct iovec iv[5];

	iv[0].iov_base = "\n";
	iv[0].iov_len = 1;
	iv[1].iov_base = __progname;
	iv[1].iov_len = strlen(__progname);
	iv[2].iov_base = ": ";
	iv[2].iov_len = 2;
	iv[3].iov_base = _PATH_MASTERPASSWD;
	iv[3].iov_len = sizeof(_PATH_MASTERPASSWD) - 1;
	iv[4].iov_base = " unchanged\n";
	iv[4].iov_len = 11;
	writev(STDERR_FILENO, iv, 5);

	_exit(1);
}

void
usage(void)
{

	(void)fprintf(stderr, "usage: %s [-s newshell] [user]\n", __progname);
	(void)fprintf(stderr, "       %s -a list\n", __progname);
	exit(1);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: chpass.c,v 1.43 2015/11/26 19:01:47 deraadt Exp $ */
2			/* $NetBSD: chpass.c,v 1.8 1996/05/15 21:50:43 jtc Exp $ */
3
4			/*-
5			* Copyright (c) 1988, 1993, 1994
6			* The Regents of the University of California. All rights reserved.
7			*
8			* Redistribution and use in source and binary forms, with or without
9			* modification, are permitted provided that the following conditions
10			* are met:
11			* 1. Redistributions of source code must retain the above copyright
12			* notice, this list of conditions and the following disclaimer.
13			* 2. Redistributions in binary form must reproduce the above copyright
14			* notice, this list of conditions and the following disclaimer in the
15			* documentation and/or other materials provided with the distribution.
16			* 3. Neither the name of the University nor the names of its contributors
17			* may be used to endorse or promote products derived from this software
18			* without specific prior written permission.
19			*
20			* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23			* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30			* SUCH DAMAGE.
31			*/
32
33			#include <sys/resource.h>
34			#include <sys/stat.h>
35			#include <sys/time.h>
36			#include <sys/uio.h>
37
38			#include <err.h>
39			#include <errno.h>
40			#include <fcntl.h>
41			#include <paths.h>
42			#include <pwd.h>
43			#include <signal.h>
44			#include <stdio.h>
45			#include <stdlib.h>
46			#include <string.h>
47			#include <unistd.h>
48			#include <util.h>
49
50			#include "chpass.h"
51
52			extern char *__progname;
53
54			enum { NEWSH, LOADENTRY, EDITENTRY } op;
55			uid_t uid;
56
57			void baduser(void);
58			void kbintr(int);
59			void usage(void);
60
61			int
62			main(int argc, char *argv[])
63			{
64			struct passwd pw = NULL, opw = NULL, lpw;
65			int i, ch, pfd, tfd, dfd;
66			char tz, arg = NULL;
67			sigset_t fullset;
68
69			/* We need to use the system timezone for date conversions. */
70			if ((tz = getenv("TZ")) != NULL) {
71			unsetenv("TZ");
72			tzset();
73			setenv("TZ", tz, 1);
74			}
75
76			op = EDITENTRY;
77			while ((ch = getopt(argc, argv, "a:s:")) != -1)
78			switch(ch) {
79			case 'a':
80			op = LOADENTRY;
81			arg = optarg;
82			break;
83			case 's':
84			op = NEWSH;
85			arg = optarg;
86			break;
87			case '?':
88			default:
89			usage();
90			}
91			argc -= optind;
92			argv += optind;
93
94			uid = getuid();
95
96			if (op == EDITENTRY \|\| op == NEWSH)
97			switch(argc) {
98			case 0:
99			pw = getpwuid_shadow(uid);
100			if (!pw)
101			errx(1, "unknown user: uid %u", uid);
102			break;
103			case 1:
104			pw = getpwnam_shadow(*argv);
105			if (!pw)
106			errx(1, "unknown user: %s", *argv);
107			if (uid && uid != pw->pw_uid)
108			baduser();
109			break;
110			default:
111			usage();
112			}
113
114			if (op == LOADENTRY) {
115			if (argc != 0)
116			errx(1, "option -a does not accept user argument");
117			if (uid)
118			baduser();
119			pw = &lpw;
120			if (!pw_scan(arg, pw, NULL))
121			exit(1);
122			opw = getpwnam_shadow(pw->pw_name);
123			}
124			if (opw == NULL && (opw = pw_dup(pw)) == NULL)
125			err(1, NULL);
126
127			/* Edit the user passwd information if requested. */
128			if (op == EDITENTRY) {
129			char tempname[] = _PATH_VARTMP "pw.XXXXXXXXXX";
130			int edit_status;
131
132			if ((pw = pw_dup(pw)) == NULL)
133			pw_error(NULL, 1, 1);
134			dfd = mkostemp(tempname, O_CLOEXEC);
135			if (dfd == -1)
136			pw_error(tempname, 1, 1);
137			display(tempname, dfd, pw);
138
139			if (pledge("stdio rpath wpath cpath id proc exec",
140			NULL) == -1)
141			err(1, "pledge");
142
143			edit_status = edit(tempname, pw);
144			close(dfd);
145			unlink(tempname);
146
147			switch (edit_status) {
148			case EDIT_OK:
149			break;
150			case EDIT_NOCHANGE:
151			pw_error(NULL, 0, 0);
152			break;
153			case EDIT_ERROR:
154			default:
155			pw_error(tempname, 1, 1);
156			break;
157			}
158			}
159
160			if (op == NEWSH) {
161			if (pledge("stdio rpath wpath cpath id proc exec",
162			NULL) == -1)
163			err(1, "pledge");
164
165			/* protect p_shell -- it thinks NULL is /bin/sh */
166			if (!arg[0])
167			usage();
168			if (p_shell(arg, pw, NULL))
169			pw_error(NULL, 0, 1);
170			}
171
172			/* Drop user's real uid and block all signals to avoid a DoS. */
173			setuid(0);
174			sigfillset(&fullset);
175			sigdelset(&fullset, SIGINT);
176			sigprocmask(SIG_BLOCK, &fullset, NULL);
177
178			if (pledge("stdio rpath wpath cpath proc exec", NULL) == -1)
179			err(1, "pledge");
180
181			/* Get the passwd lock file and open the passwd file for reading. */
182			pw_init();
183			for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
184			if (i == 4)
185			(void)fputs("Attempting to lock password file, "
186			"please wait or press ^C to abort", stderr);
187			(void)signal(SIGINT, kbintr);
188			if (i % 16 == 0)
189			fputc('.', stderr);
190			usleep(250000);
191			(void)signal(SIGINT, SIG_IGN);
192			}
193			if (i >= 4)
194			fputc('\n', stderr);
195			pfd = open(_PATH_MASTERPASSWD, O_RDONLY\|O_CLOEXEC, 0);
196			if (pfd == -1)
197			pw_error(_PATH_MASTERPASSWD, 1, 1);
198
199			/* Copy the passwd file to the lock file, updating pw. */
200			pw_copy(pfd, tfd, pw, opw);
201
202			/* If username changed we need to rebuild the entire db. */
203			arg = !strcmp(opw->pw_name, pw->pw_name) ? pw->pw_name : NULL;
204
205			/* Now finish the passwd file update. */
206			if (pw_mkdb(arg, 0) == -1)
207			pw_error(NULL, 0, 1);
208			exit(0);
209			}
210
211			void
212			baduser(void)
213			{
214
215			errx(1, "%s", strerror(EACCES));
216			}
217
218			/* ARGSUSED */
219			void
220			kbintr(int signo)
221			{
222			struct iovec iv[5];
223
224			iv[0].iov_base = "\n";
225			iv[0].iov_len = 1;
226			iv[1].iov_base = __progname;
227			iv[1].iov_len = strlen(__progname);
228			iv[2].iov_base = ": ";
229			iv[2].iov_len = 2;
230			iv[3].iov_base = _PATH_MASTERPASSWD;
231			iv[3].iov_len = sizeof(_PATH_MASTERPASSWD) - 1;
232			iv[4].iov_base = " unchanged\n";
233			iv[4].iov_len = 11;
234			writev(STDERR_FILENO, iv, 5);
235
236			_exit(1);
237			}
238
239			void
240			usage(void)
241			{
242
243			(void)fprintf(stderr, "usage: %s [-s newshell] [user]\n", __progname);
244			(void)fprintf(stderr, " %s -a list\n", __progname);
245			exit(1);
246			}