| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Copyright 1989 - 1991, Julianne Frances Haugh <jockgrrl@austin.rr.com>
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| 4 | * All rights reserved.
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| 5 | *
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| 6 | * Redistribution and use in source and binary forms, with or without
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| 7 | * modification, are permitted provided that the following conditions
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| 8 | * are met:
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| 9 | * 1. Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * 2. Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
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| 15 | * may be used to endorse or promote products derived from this software
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| 16 | * without specific prior written permission.
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| 17 | *
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| 18 | * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
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| 19 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 20 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 21 | * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
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| 22 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 23 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 24 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 25 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 26 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 27 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 28 | * SUCH DAMAGE.
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| 29 | */
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| 30 |
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| 31 | #include <stdio.h>
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| 32 | #include <errno.h>
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| 33 | #include <unistd.h>
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| 34 | #include <string.h>
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| 35 | #include <stdlib.h>
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| 36 | #include <syslog.h>
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| 37 | #include <ctype.h>
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| 38 | #include <crypt.h>
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| 39 |
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| 40 | #include "libbb.h"
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| 41 |
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| 42 |
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| 43 |
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| 44 | /* Ask the user for a password.
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| 45 | Return 1 if the user gives the correct password for entry PW,
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| 46 | 0 if not. Return 1 without asking for a password if run by UID 0
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| 47 | or if PW has an empty password. */
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| 48 |
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| 49 | int correct_password ( const struct passwd *pw )
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| 50 | {
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| 51 | char *unencrypted, *encrypted, *correct;
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| 52 |
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| 53 | #ifdef CONFIG_FEATURE_SHADOWPASSWDS
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| 54 | if (( strcmp ( pw-> pw_passwd, "x" ) == 0 ) || ( strcmp ( pw-> pw_passwd, "*" ) == 0 )) {
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| 55 | struct spwd *sp = getspnam ( pw-> pw_name );
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| 56 |
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| 57 | if ( !sp )
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| 58 | bb_error_msg_and_die ( "\nno valid shadow password" );
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| 59 |
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| 60 | correct = sp-> sp_pwdp;
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| 61 | }
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| 62 | else
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| 63 | #endif
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| 64 | correct = pw-> pw_passwd;
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| 65 |
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| 66 | if ( correct == 0 || correct[0] == '\0' )
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| 67 | return 1;
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| 68 |
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| 69 | unencrypted = bb_askpass ( 0, "Password: " );
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| 70 | if ( !unencrypted )
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| 71 | {
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| 72 | return 0;
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| 73 | }
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| 74 | encrypted = crypt ( unencrypted, correct );
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| 75 | memset ( unencrypted, 0, strlen ( unencrypted ));
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| 76 | return ( strcmp ( encrypted, correct ) == 0 ) ? 1 : 0;
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| 77 | }
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