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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/passwd/local_passwd.c	Lines:	0	102	0.0 %
Date:	2017-11-07	Branches:	0	64	0.0 %


/*	$OpenBSD: local_passwd.c,v 1.53 2016/12/30 23:32:14 millert Exp $	*/

/*-
 * Copyright (c) 1990 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/types.h>
#include <sys/stat.h>
#include <sys/uio.h>

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

#define UNCHANGED_MSG	"Password unchanged."

static uid_t uid;
extern int pwd_check(login_cap_t *, char *);
extern int pwd_gettries(login_cap_t *);

int local_passwd(char *, int);
char *getnewpasswd(struct passwd *, login_cap_t *, int);
void kbintr(int);

int
local_passwd(char *uname, int authenticated)
{
	struct passwd *pw, *opw;
	login_cap_t *lc;
	sigset_t fullset;
	time_t period;
	int i, pfd, tfd = -1;
	int pwflags = _PASSWORD_OMITV7;

	if (!(pw = getpwnam_shadow(uname))) {
		warnx("unknown user %s.", uname);
		return(1);
	}

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

	if ((opw = pw_dup(pw)) == NULL) {
		warn(NULL);
		return(1);
	}
	if ((lc = login_getclass(pw->pw_class)) == NULL) {
		warnx("unable to get login class for user %s.", uname);
		free(opw);
		return(1);
	}

	uid = authenticated ? pw->pw_uid : getuid();
	if (uid && uid != pw->pw_uid) {
		warnx("login/uid mismatch, username argument required.");
		free(opw);
		return(1);
	}

	/* Get the new password. */
	pw->pw_passwd = getnewpasswd(pw, lc, authenticated);

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

	/* Reset password change time based on login.conf. */
	period = (time_t)login_getcaptime(lc, "passwordtime", 0, 0);
	if (period > 0) {
		pw->pw_change = time(NULL) + period;
	} else {
		/*
		 * If the pw change time is the same we only need
		 * to update the spwd.db file.
		 */
		if (pw->pw_change != 0)
			pw->pw_change = 0;
		else
			pwflags = _PASSWORD_SECUREONLY;
	}

	/* 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 flock", NULL) == -1)
		err(1, "pledge");

	/* Get a lock on the passwd file and open it. */
	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 < 0)
		pw_error(_PATH_MASTERPASSWD, 1, 1);

	/* Update master.passwd file and rebuild spwd.db. */
	pw_copy(pfd, tfd, pw, opw);
	free(opw);
	if (pw_mkdb(uname, pwflags) < 0)
		pw_error(NULL, 0, 1);

	return(0);
}

char *
getnewpasswd(struct passwd *pw, login_cap_t *lc, int authenticated)
{
	static char hash[_PASSWORD_LEN];
	char newpass[1024];
	char *p, *pref;
	int tries, pwd_tries;
	sig_t saveint, savequit;

	saveint = signal(SIGINT, kbintr);
	savequit = signal(SIGQUIT, kbintr);

	if (!authenticated) {
		(void)printf("Changing password for %s.\n", pw->pw_name);
		if (uid != 0 && pw->pw_passwd[0] != '\0') {
			char oldpass[1024];

			p = readpassphrase("Old password:", oldpass,
			    sizeof(oldpass), RPP_ECHO_OFF);
			if (p == NULL || *p == '\0') {
				(void)printf("%s\n", UNCHANGED_MSG);
				pw_abort();
				exit(p == NULL ? 1 : 0);
			}
			if (crypt_checkpass(p, pw->pw_passwd) != 0) {
				errno = EACCES;
				explicit_bzero(oldpass, sizeof(oldpass));
				pw_error(NULL, 1, 1);
			}
			explicit_bzero(oldpass, sizeof(oldpass));
		}
	}

	pwd_tries = pwd_gettries(lc);

	for (newpass[0] = '\0', tries = 0;;) {
		char repeat[1024];

		p = readpassphrase("New password:", newpass, sizeof(newpass),
		    RPP_ECHO_OFF);
		if (p == NULL || *p == '\0') {
			(void)printf("%s\n", UNCHANGED_MSG);
			pw_abort();
			exit(p == NULL ? 1 : 0);
		}
		if (strcmp(p, "s/key") == 0) {
			printf("That password collides with a system feature. Choose another.\n");
			continue;
		}

		if ((tries++ < pwd_tries || pwd_tries == 0) &&
		    pwd_check(lc, p) == 0)
			continue;
		p = readpassphrase("Retype new password:", repeat, sizeof(repeat),
		    RPP_ECHO_OFF);
		if (p != NULL && strcmp(newpass, p) == 0) {
			explicit_bzero(repeat, sizeof(repeat));
			break;
		}
		(void)printf("Mismatch; try again, EOF to quit.\n");
		explicit_bzero(repeat, sizeof(repeat));
		explicit_bzero(newpass, sizeof(newpass));
	}

	(void)signal(SIGINT, saveint);
	(void)signal(SIGQUIT, savequit);

	pref = login_getcapstr(lc, "localcipher", NULL, NULL);
	if (crypt_newhash(newpass, pref, hash, sizeof(hash)) != 0) {
		(void)printf("Couldn't generate hash.\n");
		explicit_bzero(newpass, sizeof(newpass));
		pw_error(NULL, 0, 0);
	}
	explicit_bzero(newpass, sizeof(newpass));
	free(pref);
	return hash;
}

void
kbintr(int signo)
{
	dprintf(STDOUT_FILENO, "\n%s\n", UNCHANGED_MSG);
	_exit(0);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: local_passwd.c,v 1.53 2016/12/30 23:32:14 millert Exp $ */
2
3			/*-
4			* Copyright (c) 1990 The Regents of the University of California.
5			* 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
13			* 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
16			* 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
23			* 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
28			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29			* SUCH DAMAGE.
30			*/
31
32			#include <sys/types.h>
33			#include <sys/stat.h>
34			#include <sys/uio.h>
35
36			#include <err.h>
37			#include <errno.h>
38			#include <fcntl.h>
39			#include <pwd.h>
40			#include <stdio.h>
41			#include <stdlib.h>
42			#include <signal.h>
43			#include <string.h>
44			#include <unistd.h>
45			#include <util.h>
46			#include <login_cap.h>
47			#include <readpassphrase.h>
48
49			#define UNCHANGED_MSG "Password unchanged."
50
51			static uid_t uid;
52			extern int pwd_check(login_cap_t , char );
53			extern int pwd_gettries(login_cap_t *);
54
55			int local_passwd(char *, int);
56			char getnewpasswd(struct passwd , login_cap_t *, int);
57			void kbintr(int);
58
59			int
60			local_passwd(char *uname, int authenticated)
61			{
62			struct passwd pw, opw;
63			login_cap_t *lc;
64			sigset_t fullset;
65			time_t period;
66			int i, pfd, tfd = -1;
67			int pwflags = _PASSWORD_OMITV7;
68
69			if (!(pw = getpwnam_shadow(uname))) {
70			warnx("unknown user %s.", uname);
71			return(1);
72			}
73
74			if (pledge("stdio rpath wpath cpath getpw tty id proc exec flock", NULL) == -1)
75			err(1, "pledge");
76
77			if ((opw = pw_dup(pw)) == NULL) {
78			warn(NULL);
79			return(1);
80			}
81			if ((lc = login_getclass(pw->pw_class)) == NULL) {
82			warnx("unable to get login class for user %s.", uname);
83			free(opw);
84			return(1);
85			}
86
87			uid = authenticated ? pw->pw_uid : getuid();
88			if (uid && uid != pw->pw_uid) {
89			warnx("login/uid mismatch, username argument required.");
90			free(opw);
91			return(1);
92			}
93
94			/* Get the new password. */
95			pw->pw_passwd = getnewpasswd(pw, lc, authenticated);
96
97			if (pledge("stdio rpath wpath cpath getpw id proc exec flock", NULL) == -1)
98			err(1, "pledge");
99
100			/* Reset password change time based on login.conf. */
101			period = (time_t)login_getcaptime(lc, "passwordtime", 0, 0);
102			if (period > 0) {
103			pw->pw_change = time(NULL) + period;
104			} else {
105			/*
106			* If the pw change time is the same we only need
107			* to update the spwd.db file.
108			*/
109			if (pw->pw_change != 0)
110			pw->pw_change = 0;
111			else
112			pwflags = _PASSWORD_SECUREONLY;
113			}
114
115			/* Drop user's real uid and block all signals to avoid a DoS. */
116			setuid(0);
117			sigfillset(&fullset);
118			sigdelset(&fullset, SIGINT);
119			sigprocmask(SIG_BLOCK, &fullset, NULL);
120
121			if (pledge("stdio rpath wpath cpath proc exec flock", NULL) == -1)
122			err(1, "pledge");
123
124			/* Get a lock on the passwd file and open it. */
125			pw_init();
126			for (i = 1; (tfd = pw_lock(0)) == -1; i++) {
127			if (i == 4)
128			(void)fputs("Attempting to lock password file, "
129			"please wait or press ^C to abort", stderr);
130			(void)signal(SIGINT, kbintr);
131			if (i % 16 == 0)
132			fputc('.', stderr);
133			usleep(250000);
134			(void)signal(SIGINT, SIG_IGN);
135			}
136			if (i >= 4)
137			fputc('\n', stderr);
138			pfd = open(_PATH_MASTERPASSWD, O_RDONLY \| O_CLOEXEC, 0);
139			if (pfd < 0)
140			pw_error(_PATH_MASTERPASSWD, 1, 1);
141
142			/* Update master.passwd file and rebuild spwd.db. */
143			pw_copy(pfd, tfd, pw, opw);
144			free(opw);
145			if (pw_mkdb(uname, pwflags) < 0)
146			pw_error(NULL, 0, 1);
147
148			return(0);
149			}
150
151			char *
152			getnewpasswd(struct passwd pw, login_cap_t lc, int authenticated)
153			{
154			static char hash[_PASSWORD_LEN];
155			char newpass[1024];
156			char p, pref;
157			int tries, pwd_tries;
158			sig_t saveint, savequit;
159
160			saveint = signal(SIGINT, kbintr);
161			savequit = signal(SIGQUIT, kbintr);
162
163			if (!authenticated) {
164			(void)printf("Changing password for %s.\n", pw->pw_name);
165			if (uid != 0 && pw->pw_passwd[0] != '\0') {
166			char oldpass[1024];
167
168			p = readpassphrase("Old password:", oldpass,
169			sizeof(oldpass), RPP_ECHO_OFF);
170			if (p == NULL \|\| *p == '\0') {
171			(void)printf("%s\n", UNCHANGED_MSG);
172			pw_abort();
173			exit(p == NULL ? 1 : 0);
174			}
175			if (crypt_checkpass(p, pw->pw_passwd) != 0) {
176			errno = EACCES;
177			explicit_bzero(oldpass, sizeof(oldpass));
178			pw_error(NULL, 1, 1);
179			}
180			explicit_bzero(oldpass, sizeof(oldpass));
181			}
182			}
183
184			pwd_tries = pwd_gettries(lc);
185
186			for (newpass[0] = '\0', tries = 0;;) {
187			char repeat[1024];
188
189			p = readpassphrase("New password:", newpass, sizeof(newpass),
190			RPP_ECHO_OFF);
191			if (p == NULL \|\| *p == '\0') {
192			(void)printf("%s\n", UNCHANGED_MSG);
193			pw_abort();
194			exit(p == NULL ? 1 : 0);
195			}
196			if (strcmp(p, "s/key") == 0) {
197			printf("That password collides with a system feature. Choose another.\n");
198			continue;
199			}
200
201			if ((tries++ < pwd_tries \|\| pwd_tries == 0) &&
202			pwd_check(lc, p) == 0)
203			continue;
204			p = readpassphrase("Retype new password:", repeat, sizeof(repeat),
205			RPP_ECHO_OFF);
206			if (p != NULL && strcmp(newpass, p) == 0) {
207			explicit_bzero(repeat, sizeof(repeat));
208			break;
209			}
210			(void)printf("Mismatch; try again, EOF to quit.\n");
211			explicit_bzero(repeat, sizeof(repeat));
212			explicit_bzero(newpass, sizeof(newpass));
213			}
214
215			(void)signal(SIGINT, saveint);
216			(void)signal(SIGQUIT, savequit);
217
218			pref = login_getcapstr(lc, "localcipher", NULL, NULL);
219			if (crypt_newhash(newpass, pref, hash, sizeof(hash)) != 0) {
220			(void)printf("Couldn't generate hash.\n");
221			explicit_bzero(newpass, sizeof(newpass));
222			pw_error(NULL, 0, 0);
223			}
224			explicit_bzero(newpass, sizeof(newpass));
225			free(pref);
226			return hash;
227			}
228
229			void
230			kbintr(int signo)
231			{
232			dprintf(STDOUT_FILENO, "\n%s\n", UNCHANGED_MSG);
233			_exit(0);
234			}