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 "libbb.h"
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32 |
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33 | /* Ask the user for a password.
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34 | * Return 1 if the user gives the correct password for entry PW,
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35 | * 0 if not. Return 1 without asking if PW has an empty password.
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36 | *
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37 | * NULL pw means "just fake it for login with bad username" */
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38 |
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39 | int correct_password(const struct passwd *pw)
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40 | {
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41 | char *unencrypted, *encrypted;
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42 | const char *correct;
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43 |
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44 | /* fake salt. crypt() can choke otherwise. */
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45 | correct = "aa";
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46 | if (!pw) {
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47 | /* "aa" will never match */
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48 | goto fake_it;
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49 | }
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50 | correct = pw->pw_passwd;
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51 | #if ENABLE_FEATURE_SHADOWPASSWDS
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52 | if ((correct[0] == 'x' || correct[0] == '*') && !correct[1]) {
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53 | /* Using _r function to avoid pulling in static buffers */
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54 | struct spwd spw;
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55 | struct spwd *result;
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56 | char buffer[256];
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57 | correct = (getspnam_r(pw->pw_name, &spw, buffer, sizeof(buffer), &result)) ? "aa" : spw.sp_pwdp;
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58 | }
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59 | #endif
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60 |
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61 | if (!correct[0]) /* empty password field? */
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62 | return 1;
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63 |
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64 | fake_it:
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65 | unencrypted = bb_askpass(0, "Password: ");
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66 | if (!unencrypted) {
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67 | return 0;
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68 | }
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69 | encrypted = crypt(unencrypted, correct);
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70 | memset(unencrypted, 0, strlen(unencrypted));
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71 | return strcmp(encrypted, correct) == 0;
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72 | }
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