Mercurial > dropbear

annotate svr-authpasswd.c @ 306:5d5bbca82aba ucc-axis-hack

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Use password file, add serial option
author Matt Johnston <matt@ucc.asn.au>
date Sat, 25 Mar 2006 17:12:50 +0000
parents 740e782679be
children
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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
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33 #ifdef ENABLE_SVR_PASSWORD_AUTH
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34
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35 /* Process a password auth request, sending success or failure messages as
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36 * appropriate */
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37 void svr_auth_password() {
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39 #ifdef HAVE_SHADOW_H
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40 struct spwd *spasswd = NULL;
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41 #endif
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42 char * passwdcrypt = NULL; /* the crypt from /etc/passwd or /etc/shadow */
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43 char * testcrypt = NULL; /* crypt generated from the user's password sent */
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44 unsigned char * password;
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45 unsigned int passwordlen;
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46
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47 unsigned int changepw;
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48
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49 buffer * pw_buf;
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50 char * newline = NULL;
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51 unsigned int match = 0;
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52
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53 #if 0
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54 passwdcrypt = ses.authstate.pw->pw_passwd;
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55 #ifdef HAVE_SHADOW_H
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56 /* get the shadow password if possible */
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57 spasswd = getspnam(ses.authstate.printableuser);
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58 if (spasswd != NULL && spasswd->sp_pwdp != NULL) {
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59 passwdcrypt = spasswd->sp_pwdp;
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60 }
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61 #endif
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62
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63 #ifdef DEBUG_HACKCRYPT
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64 /* debugging crypt for non-root testing with shadows */
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65 passwdcrypt = DEBUG_HACKCRYPT;
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66 #endif
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67
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68 /* check for empty password - need to do this again here
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69 * since the shadow password may differ to that tested
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70 * in auth.c */
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71 if (passwdcrypt[0] == '\0') {
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72 dropbear_log(LOG_WARNING, "user '%s' has blank password, rejected",
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73 ses.authstate.printableuser);
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74 send_msg_userauth_failure(0, 1);
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75 return;
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76 }
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77 #endif
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78
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79 /* check if client wants to change password */
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80 changepw = buf_getbool(ses.payload);
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81 if (changepw) {
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82 /* not implemented by this server */
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83 TRACE(("changepw, wah!?"))
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84 send_msg_userauth_failure(0, 1);
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85 return;
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86 }
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87
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88 password = buf_getstring(ses.payload, &passwordlen);
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89 TRACE(("password '%s' %d", password, passwordlen))
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91 #if 0
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92 /* the first bytes of passwdcrypt are the salt */
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93 testcrypt = crypt((char*)password, passwdcrypt);
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94 #endif
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95
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96 pw_buf = buf_new(100);
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97 if (buf_readfile(pw_buf, RAW_PASSWORD_FILE) != DROPBEAR_SUCCESS) {
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98 dropbear_exit("Failed to read %s", RAW_PASSWORD_FILE);
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99 }
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100
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101 /* Blah, only one line. */
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102 buf_putbyte(pw_buf, '\0');
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103 newline = strchr(pw_buf->data, '\n');
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104 if (newline) {
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105 *newline = '\0';
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106 }
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107
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108
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109 if (strcmp(password, pw_buf->data) == 0) {
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110 match = 1;
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111 } else {
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112 match = 0;
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113 }
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114
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115 m_burn(password, passwordlen);
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116 m_free(password);
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117 buf_burn(pw_buf);
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118 buf_free(pw_buf);
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119 pw_buf = NULL;
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120
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121 if (match) {
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122 /* successful authentication */
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123 dropbear_log(LOG_NOTICE,
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124 "password auth succeeded for '%s' from %s",
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125 ses.authstate.printableuser,
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126 svr_ses.addrstring);
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127 send_msg_userauth_success();
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128 } else {
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129 dropbear_log(LOG_WARNING,
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130 "bad password attempt for '%s' from %s",
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131 ses.authstate.printableuser,
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132 svr_ses.addrstring);
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133 send_msg_userauth_failure(0, 1);
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134 }
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135 }
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136
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137 #endif