Mercurial > dropbear
annotate svr-authpam.c @ 602:2d896267f16d
- Fix DROPBEAR_PRNGD_SOCKET since it doesn't need to call connect()
any more
author | Matt Johnston <matt@ucc.asn.au> |
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date | Sun, 27 Feb 2011 13:12:17 +0000 |
parents | a98a2138364a |
children | a842469ce8ad |
rev | line source |
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1 /* |
121 | 2 * Dropbear SSH |
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3 * |
121 | 4 * Copyright (c) 2004 Martin Carlsson |
5 * Portions (c) 2004 Matt Johnston | |
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6 * All rights reserved. |
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7 * |
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8 * Permission is hereby granted, free of charge, to any person obtaining a copy |
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9 * of this software and associated documentation files (the "Software"), to deal |
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10 * in the Software without restriction, including without limitation the rights |
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11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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12 * copies of the Software, and to permit persons to whom the Software is |
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13 * furnished to do so, subject to the following conditions: |
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14 * |
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15 * The above copyright notice and this permission notice shall be included in |
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16 * all copies or substantial portions of the Software. |
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17 * |
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18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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24 * SOFTWARE. */ |
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25 |
121 | 26 /* Validates a user password using PAM */ |
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27 |
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28 #include "includes.h" |
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29 #include "session.h" |
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30 #include "buffer.h" |
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31 #include "dbutil.h" |
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32 #include "auth.h" |
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33 |
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34 #ifdef ENABLE_SVR_PAM_AUTH |
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35 |
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36 #if defined(HAVE_SECURITY_PAM_APPL_H) |
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37 #include <security/pam_appl.h> |
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38 #elif defined (HAVE_PAM_PAM_APPL_H) |
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39 #include <pam/pam_appl.h> |
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40 #endif |
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41 |
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42 struct UserDataS { |
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43 char* user; |
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44 char* passwd; |
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45 }; |
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46 |
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47 /* PAM conversation function - for now we only handle one message */ |
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48 int |
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49 pamConvFunc(int num_msg, |
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50 const struct pam_message **msg, |
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51 struct pam_response **respp, |
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52 void *appdata_ptr) { |
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53 |
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54 int rc = PAM_SUCCESS; |
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55 struct pam_response* resp = NULL; |
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56 struct UserDataS* userDatap = (struct UserDataS*) appdata_ptr; |
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57 unsigned int msg_len = 0; |
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58 unsigned int i = 0; |
121 | 59 |
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60 const char* message = (*msg)->msg; |
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61 |
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62 /* make a copy we can strip */ |
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63 char * compare_message = m_strdup(message); |
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64 |
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65 TRACE(("enter pamConvFunc")) |
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67 if (num_msg != 1) { | |
68 /* If you're getting here - Dropbear probably can't support your pam | |
69 * modules. This whole file is a bit of a hack around lack of | |
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70 * asynchronocity in PAM anyway. */ |
121 | 71 dropbear_log(LOG_INFO, "pamConvFunc() called with >1 messages: not supported."); |
72 return PAM_CONV_ERR; | |
73 } | |
74 | |
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75 TRACE(("msg_style is %d", (*msg)->msg_style)) |
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76 if (compare_message) { |
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77 TRACE(("message is '%s'", compare_message)) |
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78 } else { |
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79 TRACE(("null message")) |
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80 } |
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81 |
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82 |
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83 /* Make the string lowercase. */ |
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84 msg_len = strlen(compare_message); |
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85 for (i = 0; i < msg_len; i++) { |
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86 compare_message[i] = tolower(compare_message[i]); |
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87 } |
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88 |
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89 /* If the string ends with ": ", remove the space. |
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90 ie "login: " vs "login:" */ |
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91 if (msg_len > 2 |
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92 && compare_message[msg_len-2] == ':' |
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93 && compare_message[msg_len-1] == ' ') { |
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94 compare_message[msg_len-1] = '\0'; |
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95 } |
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96 |
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97 switch((*msg)->msg_style) { |
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98 |
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99 case PAM_PROMPT_ECHO_OFF: |
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100 |
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101 if (!(strcmp(compare_message, "password:") == 0)) { |
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102 /* We don't recognise the prompt as asking for a password, |
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103 so can't handle it. Add more above as required for |
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104 different pam modules/implementations. If you need |
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105 to add an entry here please mail the Dropbear developer */ |
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106 dropbear_log(LOG_NOTICE, "PAM unknown prompt '%s' (no echo)", |
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107 compare_message); |
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108 rc = PAM_CONV_ERR; |
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109 break; |
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110 } |
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111 |
131
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112 /* You have to read the PAM module-writers' docs (do we look like |
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113 * module writers? no.) to find out that the module will |
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114 * free the pam_response and its resp element - ie we _must_ malloc |
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115 * it here */ |
119
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116 resp = (struct pam_response*) m_malloc(sizeof(struct pam_response)); |
121 | 117 memset(resp, 0, sizeof(struct pam_response)); |
118 | |
131
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119 resp->resp = m_strdup(userDatap->passwd); |
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120 m_burn(userDatap->passwd, strlen(userDatap->passwd)); |
119
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121 (*respp) = resp; |
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122 break; |
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123 |
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124 |
119
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125 case PAM_PROMPT_ECHO_ON: |
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126 |
573
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127 if (!( |
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128 (strcmp(compare_message, "login:" ) == 0) |
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129 || (strcmp(compare_message, "please enter username:") == 0) |
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130 || (strcmp(compare_message, "username:") == 0) |
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131 )) { |
258
306499676384
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132 /* We don't recognise the prompt as asking for a username, |
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133 so can't handle it. Add more above as required for |
594
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134 different pam modules/implementations. If you need |
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135 to add an entry here please mail the Dropbear developer */ |
573
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136 dropbear_log(LOG_NOTICE, "PAM unknown prompt '%s' (with echo)", |
226
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137 compare_message); |
119
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138 rc = PAM_CONV_ERR; |
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139 break; |
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140 } |
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141 |
131
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142 /* You have to read the PAM module-writers' docs (do we look like |
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143 * module writers? no.) to find out that the module will |
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144 * free the pam_response and its resp element - ie we _must_ malloc |
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145 * it here */ |
119
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146 resp = (struct pam_response*) m_malloc(sizeof(struct pam_response)); |
121 | 147 memset(resp, 0, sizeof(struct pam_response)); |
148 | |
131
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149 resp->resp = m_strdup(userDatap->user); |
165
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150 TRACE(("userDatap->user='%s'", userDatap->user)) |
119
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151 (*respp) = resp; |
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152 break; |
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153 |
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154 default: |
165
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155 TRACE(("Unknown message type")) |
119
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156 rc = PAM_CONV_ERR; |
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157 break; |
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158 } |
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159 |
226
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160 m_free(compare_message); |
165
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161 TRACE(("leave pamConvFunc, rc %d", rc)) |
119
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162 |
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163 return rc; |
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164 } |
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165 |
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166 /* Process a password auth request, sending success or failure messages as |
121 | 167 * appropriate. To the client it looks like it's doing normal password auth (as |
168 * opposed to keyboard-interactive or something), so the pam module has to be | |
169 * fairly standard (ie just "what's your username, what's your password, OK"). | |
119
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170 * |
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171 * Keyboard interactive would be a lot nicer, but since PAM is synchronous, it |
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172 * gets very messy trying to send the interactive challenges, and read the |
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173 * interactive responses, over the network. */ |
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174 void svr_auth_pam() { |
119
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175 |
131
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176 struct UserDataS userData = {NULL, NULL}; |
119
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177 struct pam_conv pamConv = { |
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178 pamConvFunc, |
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179 &userData /* submitted to pamvConvFunc as appdata_ptr */ |
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180 }; |
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181 |
119
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182 pam_handle_t* pamHandlep = NULL; |
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183 |
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184 unsigned char * password = NULL; |
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185 unsigned int passwordlen; |
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186 |
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187 int rc = PAM_SUCCESS; |
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188 unsigned char changepw; |
57
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189 |
119
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190 /* check if client wants to change password */ |
179
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191 changepw = buf_getbool(ses.payload); |
119
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192 if (changepw) { |
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193 /* not implemented by this server */ |
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194 send_msg_userauth_failure(0, 1); |
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195 goto cleanup; |
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196 } |
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197 |
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198 password = buf_getstring(ses.payload, &passwordlen); |
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199 |
131
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200 /* used to pass data to the PAM conversation function - don't bother with |
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201 * strdup() etc since these are touched only by our own conversation |
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202 * function (above) which takes care of it */ |
464
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203 userData.user = ses.authstate.pw_name; |
119
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204 userData.passwd = password; |
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205 |
119
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206 /* Init pam */ |
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207 if ((rc = pam_start("sshd", NULL, &pamConv, &pamHandlep)) != PAM_SUCCESS) { |
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208 dropbear_log(LOG_WARNING, "pam_start() failed, rc=%d, %s\n", |
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209 rc, pam_strerror(pamHandlep, rc)); |
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210 goto cleanup; |
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211 } |
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212 |
119
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213 /* just to set it to something */ |
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214 if ((rc = pam_set_item(pamHandlep, PAM_TTY, "ssh") != PAM_SUCCESS)) { |
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215 dropbear_log(LOG_WARNING, "pam_set_item() failed, rc=%d, %s\n", |
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216 rc, pam_strerror(pamHandlep, rc)); |
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217 goto cleanup; |
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218 } |
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219 |
573
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220 #ifdef HAVE_PAM_FAIL_DELAY |
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221 /* We have our own random delay code already, disable PAM's */ |
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222 (void) pam_fail_delay(pamHandlep, 0 /* musec_delay */); |
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223 #endif |
119
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224 |
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225 /* (void) pam_set_item(pamHandlep, PAM_FAIL_DELAY, (void*) pamDelayFunc); */ |
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226 |
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227 if ((rc = pam_authenticate(pamHandlep, 0)) != PAM_SUCCESS) { |
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228 dropbear_log(LOG_WARNING, "pam_authenticate() failed, rc=%d, %s\n", |
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229 rc, pam_strerror(pamHandlep, rc)); |
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230 dropbear_log(LOG_WARNING, |
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231 "Bad PAM password attempt for '%s' from %s", |
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232 ses.authstate.pw_name, |
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233 svr_ses.addrstring); |
119
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234 send_msg_userauth_failure(0, 1); |
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235 goto cleanup; |
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236 } |
57
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237 |
119
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238 if ((rc = pam_acct_mgmt(pamHandlep, 0)) != PAM_SUCCESS) { |
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239 dropbear_log(LOG_WARNING, "pam_acct_mgmt() failed, rc=%d, %s\n", |
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240 rc, pam_strerror(pamHandlep, rc)); |
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241 dropbear_log(LOG_WARNING, |
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242 "Bad PAM password attempt for '%s' from %s", |
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243 ses.authstate.pw_name, |
158
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244 svr_ses.addrstring); |
119
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245 send_msg_userauth_failure(0, 1); |
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246 goto cleanup; |
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247 } |
57
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248 |
119
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249 /* successful authentication */ |
158
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250 dropbear_log(LOG_NOTICE, "PAM password auth succeeded for '%s' from %s", |
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251 ses.authstate.pw_name, |
158
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252 svr_ses.addrstring); |
119
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253 send_msg_userauth_success(); |
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254 |
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255 cleanup: |
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256 if (password != NULL) { |
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257 m_burn(password, passwordlen); |
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258 m_free(password); |
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259 } |
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260 if (pamHandlep != NULL) { |
165
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Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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261 TRACE(("pam_end")) |
119
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262 (void) pam_end(pamHandlep, 0 /* pam_status */); |
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263 } |
57
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264 } |
127
33d976eeb859
put the #ifdefs back in for authpam
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265 |
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266 #endif /* ENABLE_SVR_PAM_AUTH */ |