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79 lines
2.7 KiB
C
79 lines
2.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 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
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* 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.
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <syslog.h>
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#include <ctype.h>
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#include <crypt.h>
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#include "libbb.h"
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/* Ask the user for a password.
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Return 1 if the user gives the correct password for entry PW,
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0 if not. Return 1 without asking for a password if run by UID 0
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or if PW has an empty password. */
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int correct_password ( const struct passwd *pw )
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{
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char *unencrypted, *encrypted, *correct;
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#ifdef CONFIG_FEATURE_SHADOWPASSWDS
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if (( strcmp ( pw-> pw_passwd, "x" ) == 0 ) || ( strcmp ( pw-> pw_passwd, "*" ) == 0 )) {
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struct spwd *sp = getspnam ( pw-> pw_name );
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if ( !sp )
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error_msg_and_die ( "no valid shadow password" );
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correct = sp-> sp_pwdp;
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}
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else
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#endif
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correct = pw-> pw_passwd;
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if ( correct == 0 || correct[0] == '\0' )
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return 1;
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unencrypted = getpass ( "Password: " );
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if ( !unencrypted )
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{
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fputs ( "getpass: cannot open /dev/tty\n", stderr );
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return 0;
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}
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encrypted = crypt ( unencrypted, correct );
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memset ( unencrypted, 0, xstrlen ( unencrypted ));
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return ( strcmp ( encrypted, correct ) == 0 ) ? 1 : 0;
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}
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