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annotate svr-authpubkey.c @ 759:76fba0856749 ecc

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More changes for KEX and ECDH. Set up hash descriptors, make ECC code work, ses.hash and ses.session_id are now buffers (doesn't compile)
author Matt Johnston <matt@ucc.asn.au>
date Fri, 29 Mar 2013 00:28:09 +0800
parents a98a2138364a
children ac2158e3e403
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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. */
475
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24 /*
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25 * This file incorporates work covered by the following copyright and
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26 * permission notice:
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27 *
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28 * Copyright (c) 2000 Markus Friedl. All rights reserved.
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29 *
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30 * Redistribution and use in source and binary forms, with or without
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31 * modification, are permitted provided that the following conditions
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32 * are met:
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33 * 1. Redistributions of source code must retain the above copyright
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34 * notice, this list of conditions and the following disclaimer.
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35 * 2. Redistributions in binary form must reproduce the above copyright
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36 * notice, this list of conditions and the following disclaimer in the
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37 * documentation and/or other materials provided with the distribution.
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38 *
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39 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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40 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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42 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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43 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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45 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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46 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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47 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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48 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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49 *
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50 * This copyright and permission notice applies to the code parsing public keys
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51 * options string which can also be found in OpenSSH auth2-pubkey.c file
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52 * (user_key_allowed2). It has been adapted to work with buffers.
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53 *
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54 */
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55
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56 /* Process a pubkey auth request */
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57
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58 #include "includes.h"
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59 #include "session.h"
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60 #include "dbutil.h"
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61 #include "buffer.h"
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62 #include "signkey.h"
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63 #include "auth.h"
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64 #include "ssh.h"
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65 #include "packet.h"
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66 #include "algo.h"
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67
68
eee77ac31ccc cleaning up the pubkey defines
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68 #ifdef ENABLE_SVR_PUBKEY_AUTH
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70 #define MIN_AUTHKEYS_LINE 10 /* "ssh-rsa AB" - short but doesn't matter */
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71 #define MAX_AUTHKEYS_LINE 4200 /* max length of a line in authkeys */
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72
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73 static int checkpubkey(unsigned char* algo, unsigned int algolen,
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74 unsigned char* keyblob, unsigned int keybloblen);
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75 static int checkpubkeyperms();
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76 static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
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77 unsigned char* keyblob, unsigned int keybloblen);
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78 static int checkfileperm(char * filename);
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79
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80 /* process a pubkey auth request, sending success or failure message as
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81 * appropriate */
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82 void svr_auth_pubkey() {
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83
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84 unsigned char testkey; /* whether we're just checking if a key is usable */
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85 unsigned char* algo = NULL; /* pubkey algo */
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86 unsigned int algolen;
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87 unsigned char* keyblob = NULL;
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88 unsigned int keybloblen;
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89 buffer * signbuf = NULL;
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90 sign_key * key = NULL;
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91 char* fp = NULL;
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92 int type = -1;
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93
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94 TRACE(("enter pubkeyauth"))
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95
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96 /* 0 indicates user just wants to check if key can be used, 1 is an
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97 * actual attempt*/
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98 testkey = (buf_getbool(ses.payload) == 0);
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99
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100 algo = buf_getstring(ses.payload, &algolen);
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101 keybloblen = buf_getint(ses.payload);
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102 keyblob = buf_getptr(ses.payload, keybloblen);
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103
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104 /* check if the key is valid */
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105 if (checkpubkey(algo, algolen, keyblob, keybloblen) == DROPBEAR_FAILURE) {
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106 send_msg_userauth_failure(0, 0);
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107 goto out;
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108 }
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109
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110 /* let them know that the key is ok to use */
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111 if (testkey) {
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112 send_msg_userauth_pk_ok(algo, algolen, keyblob, keybloblen);
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113 goto out;
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114 }
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115
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116 /* now we can actually verify the signature */
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117
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118 /* get the key */
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119 key = new_sign_key();
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120 type = DROPBEAR_SIGNKEY_ANY;
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121 if (buf_get_pub_key(ses.payload, key, &type) == DROPBEAR_FAILURE) {
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122 send_msg_userauth_failure(0, 1);
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123 goto out;
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124 }
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125
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126 /* create the data which has been signed - this a string containing
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127 * session_id, concatenated with the payload packet up to the signature */
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128 signbuf = buf_new(ses.payload->pos + 4 + SHA1_HASH_SIZE);
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129 buf_putstring(signbuf, ses.session_id, SHA1_HASH_SIZE);
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130 buf_putbytes(signbuf, ses.payload->data, ses.payload->pos);
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131 buf_setpos(signbuf, 0);
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132
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133 /* ... and finally verify the signature */
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134 fp = sign_key_fingerprint(keyblob, keybloblen);
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135 if (buf_verify(ses.payload, key, buf_getptr(signbuf, signbuf->len),
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136 signbuf->len) == DROPBEAR_SUCCESS) {
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137 dropbear_log(LOG_NOTICE,
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138 "Pubkey auth succeeded for '%s' with key %s from %s",
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139 ses.authstate.pw_name, fp, svr_ses.addrstring);
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140 send_msg_userauth_success();
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141 } else {
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142 dropbear_log(LOG_WARNING,
594
a98a2138364a Improve capitalisation for all logged strings
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143 "Pubkey auth bad signature for '%s' with key %s from %s",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
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parents: 436
diff changeset
144 ses.authstate.pw_name, fp, svr_ses.addrstring);
4
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145 send_msg_userauth_failure(0, 1);
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146 }
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147 m_free(fp);
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148
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149 out:
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150 /* cleanup stuff */
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151 if (signbuf) {
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152 buf_free(signbuf);
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153 }
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154 if (algo) {
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155 m_free(algo);
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156 }
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157 if (key) {
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158 sign_key_free(key);
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159 key = NULL;
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160 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
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161 TRACE(("leave pubkeyauth"))
4
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162 }
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163
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164 /* Reply that the key is valid for auth, this is sent when the user sends
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165 * a straight copy of their pubkey to test, to avoid having to perform
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166 * expensive signing operations with a worthless key */
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167 static void send_msg_userauth_pk_ok(unsigned char* algo, unsigned int algolen,
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168 unsigned char* keyblob, unsigned int keybloblen) {
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169
165
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170 TRACE(("enter send_msg_userauth_pk_ok"))
4
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171 CHECKCLEARTOWRITE();
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172
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173 buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_PK_OK);
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174 buf_putstring(ses.writepayload, algo, algolen);
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175 buf_putstring(ses.writepayload, keyblob, keybloblen);
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176
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177 encrypt_packet();
165
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diff changeset
178 TRACE(("leave send_msg_userauth_pk_ok"))
4
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179
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180 }
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181
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182 /* Checks whether a specified publickey (and associated algorithm) is an
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183 * acceptable key for authentication */
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184 /* Returns DROPBEAR_SUCCESS if key is ok for auth, DROPBEAR_FAILURE otherwise */
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185 static int checkpubkey(unsigned char* algo, unsigned int algolen,
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186 unsigned char* keyblob, unsigned int keybloblen) {
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187
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188 FILE * authfile = NULL;
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189 char * filename = NULL;
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190 int ret = DROPBEAR_FAILURE;
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diff changeset
191 buffer * line = NULL;
476
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
192 unsigned int len, pos;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
193 buffer * options_buf = NULL;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
194 int line_num;
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
195
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
196 TRACE(("enter checkpubkey"))
4
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197
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parents:
diff changeset
198 /* check that we can use the algo */
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parents:
diff changeset
199 if (have_algo(algo, algolen, sshhostkey) == DROPBEAR_FAILURE) {
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diff changeset
200 dropbear_log(LOG_WARNING,
594
a98a2138364a Improve capitalisation for all logged strings
Matt Johnston <matt@ucc.asn.au>
parents: 476
diff changeset
201 "Pubkey auth attempt with unknown algo for '%s' from %s",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
202 ses.authstate.pw_name, svr_ses.addrstring);
4
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parents:
diff changeset
203 goto out;
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parents:
diff changeset
204 }
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parents:
diff changeset
205
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parents:
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206 /* check file permissions, also whether file exists */
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parents:
diff changeset
207 if (checkpubkeyperms() == DROPBEAR_FAILURE) {
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
208 TRACE(("bad authorized_keys permissions, or file doesn't exist"))
4
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parents:
diff changeset
209 goto out;
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parents:
diff changeset
210 }
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parents:
diff changeset
211
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parents:
diff changeset
212 /* we don't need to check pw and pw_dir for validity, since
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parents:
diff changeset
213 * its been done in checkpubkeyperms. */
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
214 len = strlen(ses.authstate.pw_dir);
4
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parents:
diff changeset
215 /* allocate max required pathname storage,
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parents:
diff changeset
216 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
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parents:
diff changeset
217 filename = m_malloc(len + 22);
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parents:
diff changeset
218 snprintf(filename, len + 22, "%s/.ssh/authorized_keys",
464
4317be8b7cf9 Make a copy of passwd fields since getpwnam()'s retval isn't safe to keep
Matt Johnston <matt@ucc.asn.au>
parents: 436
diff changeset
219 ses.authstate.pw_dir);
4
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parents:
diff changeset
220
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
221 /* open the file */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
222 authfile = fopen(filename, "r");
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parents:
diff changeset
223 if (authfile == NULL) {
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
224 goto out;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
225 }
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
226 TRACE(("checkpubkey: opened authorized_keys OK"))
4
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parents:
diff changeset
227
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parents:
diff changeset
228 line = buf_new(MAX_AUTHKEYS_LINE);
476
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
229 line_num = 0;
4
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parents:
diff changeset
230
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
231 /* iterate through the lines */
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
232 do {
475
52a644e7b8e1 * Patch from Frédéric Moulins adding options to authorized_keys.
Matt Johnston <matt@ucc.asn.au>
parents: 464
diff changeset
233 /* new line : potentially new options */
476
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
234 if (options_buf) {
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
235 buf_free(options_buf);
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
236 options_buf = NULL;
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
237 }
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
238
51
095d689fed16 - Hostkey checking is mostly there, just aren't appending yet.
Matt Johnston <matt@ucc.asn.au>
parents: 44
diff changeset
239 if (buf_getline(line, authfile) == DROPBEAR_FAILURE) {
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
240 /* EOF reached */
165
0cfba3034be5 Fixed DEBUG_TRACE macro so that we don't get semicolons left about the place
Matt Johnston <matt@ucc.asn.au>
parents: 158
diff changeset
241 TRACE(("checkpubkey: authorized_keys EOF reached"))
4
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
242 break;
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Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
243 }
476
df7f7da7f6e4 - Rework pubkey options to be more careful about buffer lengths. Needs review.
Matt Johnston <matt@ucc.asn.au>
parents: 475
diff changeset
244 line_num++;