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annotate svr-authpasswd.c @ 4:fe6bca95afa7

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author Matt Johnston <matt@ucc.asn.au>
date Tue, 01 Jun 2004 02:46:09 +0000
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children f789045062e6
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4
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1 /*
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2 * Dropbear - a SSH2 server
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3 *
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4 * Copyright (c) 2002,2003 Matt Johnston
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5 * All rights reserved.
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6 *
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7 * Permission is hereby granted, free of charge, to any person obtaining a copy
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8 * of this software and associated documentation files (the "Software"), to deal
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9 * in the Software without restriction, including without limitation the rights
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10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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11 * copies of the Software, and to permit persons to whom the Software is
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12 * furnished to do so, subject to the following conditions:
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13 *
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14 * The above copyright notice and this permission notice shall be included in
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15 * all copies or substantial portions of the Software.
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16 *
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17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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20 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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23 * SOFTWARE. */
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24
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25 /* Validates a user password */
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26
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27 #include "includes.h"
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28 #include "session.h"
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29 #include "buffer.h"
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30 #include "dbutil.h"
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31 #include "auth.h"
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32 #include "authpasswd.h"
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33
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34 #ifdef DROPBEAR_PASSWORD_AUTH
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35
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36 /* Process a password auth request, sending success or failure messages as
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37 * appropriate */
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38 void passwordauth() {
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39
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40 #ifdef HAVE_SHADOW_H
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41 struct spwd *spasswd;
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42 #endif
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43 char * passwdcrypt; /* the crypt from /etc/passwd or /etc/shadow */
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44 char * testcrypt; /* crypt generated from the user's password sent */
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45 unsigned char * password;
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46 unsigned int passwordlen;
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47
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48 unsigned char changepw;
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49
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50 passwdcrypt = svr_ses.authstate.pw->pw_passwd;
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51 #ifdef HAVE_SHADOW_H
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52 /* get the shadow password if possible */
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53 spasswd = getspnam(svr_ses.authstate.pw->pw_name);
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54 if (spasswd != NULL && spasswd->sp_pwdp != NULL) {
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55 passwdcrypt = spasswd->sp_pwdp;
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56 }
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57 #endif
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58
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59 #ifdef DEBUG_HACKCRYPT
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60 /* debugging crypt for non-root testing with shadows */
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61 passwdcrypt = DEBUG_HACKCRYPT;
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62 #endif
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63
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64 /* check for empty password - need to do this again here
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65 * since the shadow password may differ to that tested
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66 * in auth.c */
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67 if (passwdcrypt[0] == '\0') {
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68 dropbear_log(LOG_WARNING, "user '%s' has blank password, rejected",
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69 svr_ses.authstate.printableuser);
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70 send_msg_userauth_failure(0, 1);
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71 return;
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72 }
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73
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74 /* check if client wants to change password */
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75 changepw = buf_getbyte(ses.payload);
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76 if (changepw) {
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77 /* not implemented by this server */
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78 send_msg_userauth_failure(0, 1);
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79 return;
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80 }
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81
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82 password = buf_getstring(ses.payload, &passwordlen);
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83
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84 /* clear the buffer containing the password */
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85 buf_incrpos(ses.payload, -passwordlen - 4);
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86 m_burn(buf_getptr(ses.payload, passwordlen + 4), passwordlen + 4);
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87
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88 /* the first bytes of passwdcrypt are the salt */
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89 testcrypt = crypt((char*)password, passwdcrypt);
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90
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91 if (strcmp(testcrypt, passwdcrypt) == 0) {
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92 /* successful authentication */
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93 dropbear_log(LOG_NOTICE,
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94 "password auth succeeded for '%s'",
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95 svr_ses.authstate.printableuser);
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96 send_msg_userauth_success();
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97 } else {
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98 dropbear_log(LOG_WARNING,
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99 "bad password attempt for '%s'",
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100 svr_ses.authstate.printableuser);
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101 send_msg_userauth_failure(0, 1);
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102 }
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103
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104 m_burn(password, passwordlen);
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105 m_free(password);
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106 }
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107
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108 #endif /* DROPBEAR_PASSWORD_AUTH */