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annotate packages/net/snmp/lib/current/src/keytools.c @ 103:95f3e12a6327 ecos-sw-2000-06-23

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Merge from eCos master repository on 2000-06-23-16:41:10-BST
author jlarmour
date Fri, 23 Jun 2000 17:06:31 +0000
parents
children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // ./lib/current/src/keytools.c
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4 //
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5 //
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6 //==========================================================================
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7 //####COPYRIGHTBEGIN####
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8 //
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9 // -------------------------------------------
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10 // The contents of this file are subject to the Red Hat eCos Public License
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11 // Version 1.1 (the "License"); you may not use this file except in
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12 // compliance with the License. You may obtain a copy of the License at
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13 // http://www.redhat.com/
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14 //
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15 // Software distributed under the License is distributed on an "AS IS"
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16 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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17 // License for the specific language governing rights and limitations under
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18 // the License.
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19 //
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20 // The Original Code is eCos - Embedded Configurable Operating System,
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21 // released September 30, 1998.
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22 //
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23 // The Initial Developer of the Original Code is Red Hat.
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24 // Portions created by Red Hat are
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25 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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26 // All Rights Reserved.
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27 // -------------------------------------------
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28 //
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29 //####COPYRIGHTEND####
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30 //####UCDSNMPCOPYRIGHTBEGIN####
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31 //
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32 // -------------------------------------------
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33 //
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34 // Portions of this software may have been derived from the UCD-SNMP
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35 // project, <http://ucd-snmp.ucdavis.edu/> from the University of
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36 // California at Davis, which was originally based on the Carnegie Mellon
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37 // University SNMP implementation. Portions of this software are therefore
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38 // covered by the appropriate copyright disclaimers included herein.
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39 //
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40 // The release used was version 4.1.2 of May 2000. "ucd-snmp-4.1.2"
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41 // -------------------------------------------
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42 //
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43 //####UCDSNMPCOPYRIGHTEND####
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44 //==========================================================================
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45 //#####DESCRIPTIONBEGIN####
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46 //
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47 // Author(s): hmt
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48 // Contributors: hmt
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49 // Date: 2000-05-30
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50 // Purpose: Port of UCD-SNMP distribution to eCos.
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51 // Description:
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52 //
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53 //
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54 //####DESCRIPTIONEND####
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55 //
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56 //==========================================================================
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57 /********************************************************************
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58 Copyright 1989, 1991, 1992 by Carnegie Mellon University
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59
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60 Derivative Work -
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61 Copyright 1996, 1998, 1999, 2000 The Regents of the University of California
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62
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63 All Rights Reserved
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64
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65 Permission to use, copy, modify and distribute this software and its
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66 documentation for any purpose and without fee is hereby granted,
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67 provided that the above copyright notice appears in all copies and
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68 that both that copyright notice and this permission notice appear in
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69 supporting documentation, and that the name of CMU and The Regents of
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70 the University of California not be used in advertising or publicity
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71 pertaining to distribution of the software without specific written
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72 permission.
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73
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74 CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
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75 WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
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76 WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CMU OR
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77 THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
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78 INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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79 FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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80 CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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81 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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82 *********************************************************************/
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83 /*
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84 * keytools.c
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85 */
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86
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87 #include <config.h>
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88
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89 #include <stdio.h>
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90 #include <sys/types.h>
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91 #if HAVE_WINSOCK_H
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92 #include <winsock.h>
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93 #endif
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94 #ifdef HAVE_NETINET_IN_H
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95 #include <netinet/in.h>
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96 #endif
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97 #ifdef HAVE_STDLIB_H
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98 #include <stdlib.h>
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99 #endif
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100 #if HAVE_STRING_H
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101 #include <string.h>
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102 #else
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103 #include <strings.h>
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104 #endif
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105
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106 #if HAVE_DMALLOC_H
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107 #include <dmalloc.h>
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108 #endif
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109
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110 #include "asn1.h"
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111 #include "snmp_api.h"
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112 #ifdef USE_OPENSSL
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113 # include <openssl/hmac.h>
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114 #else
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115 #ifdef USE_INTERNAL_MD5
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116 #include "md5.h"
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117 #endif
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118 #endif
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119
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120 #include "scapi.h"
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121 #include "keytools.h"
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122 #include "tools.h"
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123 #include "snmp_debug.h"
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124 #include "snmp_logging.h"
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125
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126 #include "transform_oids.h"
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127
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128 /*******************************************************************-o-******
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129 * generate_Ku
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130 *
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131 * Parameters:
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132 * *hashtype MIB OID for the transform type for hashing.
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133 * hashtype_len Length of OID value.
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134 * *P Pre-allocated bytes of passpharase.
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135 * pplen Length of passphrase.
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136 * *Ku Buffer to contain Ku.
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137 * *kulen Length of Ku buffer.
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138 *
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139 * Returns:
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140 * SNMPERR_SUCCESS Success.
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141 * SNMPERR_GENERR All errors.
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142 *
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143 *
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144 * Convert a passphrase into a master user key, Ku, according to the
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145 * algorithm given in RFC 2274 concerning the SNMPv3 User Security Model (USM)
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146 * as follows:
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147 *
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148 * Expand the passphrase to fill the passphrase buffer space, if necessary,
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149 * concatenation as many duplicates as possible of P to itself. If P is
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150 * larger than the buffer space, truncate it to fit.
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151 *
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152 * Then hash the result with the given hashtype transform. Return
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153 * the result as Ku.
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154 *
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155 * If successful, kulen contains the size of the hash written to Ku.
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156 *
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157 * NOTE Passphrases less than USM_LENGTH_P_MIN characters in length
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158 * cause an error to be returned.
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159 * (Punt this check to the cmdline apps? XXX)
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160 */
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161 int
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162 generate_Ku( oid *hashtype, u_int hashtype_len,
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163 u_char *P, size_t pplen,
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164 u_char *Ku, size_t *kulen)
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165 #if defined(USE_INTERNAL_MD5) || defined(USE_OPENSSL)
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166 {
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167 int rval = SNMPERR_SUCCESS,
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168 nbytes = USM_LENGTH_EXPANDED_PASSPHRASE;
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169
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170 u_int i, pindex = 0;
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171
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172 u_char buf[USM_LENGTH_KU_HASHBLOCK],
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173 *bufp;
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174
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175 #ifdef USE_OPENSSL
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176 EVP_MD_CTX *ctx = malloc(sizeof(EVP_MD_CTX));
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177 #else
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178 MDstruct MD;
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179 #endif
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180 /*
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181 * Sanity check.
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182 */
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183 if ( !hashtype || !P || !Ku || !kulen
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184 || (*kulen<=0)
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185 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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186 {
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187 QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
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188 }
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189
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190 if (pplen < USM_LENGTH_P_MIN) {
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191 #ifdef SNMP_TESTING_CODE
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192 snmp_log(LOG_WARNING, "Warning: passphrase chosen is below the length requiremnts of the USM.\n");
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193 #else
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194 snmp_set_detail("Password length too short.");
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195 QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
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196 #endif
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197 }
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198
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199
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200 /*
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201 * Setup for the transform type.
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202 */
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203 #ifdef USE_OPENSSL
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204
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205 if (ISTRANSFORM(hashtype, HMACMD5Auth))
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206 EVP_DigestInit(ctx, EVP_md5());
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207 else if (ISTRANSFORM(hashtype, HMACSHA1Auth))
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208 EVP_DigestInit(ctx, EVP_sha1());
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209 else {
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210 free(ctx);
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211 return (SNMPERR_GENERR);
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212 }
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213 #else
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214 MDbegin(&MD);
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215 #endif /* USE_OPENSSL */
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216
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217 while (nbytes > 0) {
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218 bufp = buf;
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219 for (i = 0; i < USM_LENGTH_KU_HASHBLOCK; i++) {
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220 *bufp++ = P[pindex++ % pplen];
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221 }
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222 #ifdef USE_OPENSSL
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223 EVP_DigestUpdate(ctx, buf, USM_LENGTH_KU_HASHBLOCK);
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224 #else
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225 if (MDupdate(&MD, buf, USM_LENGTH_KU_HASHBLOCK*8)) {
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226 rval = SNMPERR_USM_ENCRYPTIONERROR;
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227 goto md5_fin;
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228 }
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229 #endif /* USE_OPENSSL */
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230
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231 nbytes -= USM_LENGTH_KU_HASHBLOCK;
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232 }
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233
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234 #ifdef USE_OPENSSL
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235 EVP_DigestFinal(ctx, (unsigned char *) Ku, (unsigned int *) kulen);
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236 /* what about free() */
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237 #else
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238 if (MDupdate(&MD, buf, 0)) {
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239 rval = SNMPERR_USM_ENCRYPTIONERROR;
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240 goto md5_fin;
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241 }
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242 *kulen = sc_get_properlength(hashtype, hashtype_len);
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243 MDget(&MD, Ku, *kulen);
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244 md5_fin:
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245 memset(&MD, 0, sizeof(MD));
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246 #endif /* USE_OPENSSL */
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247
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248
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249 #ifdef SNMP_TESTING_CODE
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250 DEBUGMSGTL(("generate_Ku", "generating Ku (from %s): ", P));
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251 for(i=0; i < *kulen; i++)
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252 DEBUGMSG(("generate_Ku", "%02x",Ku[i]));
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253 DEBUGMSG(("generate_Ku","\n"));
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254 #endif /* SNMP_TESTING_CODE */
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255
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256
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257 generate_Ku_quit:
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258 memset(buf, 0, sizeof(buf));
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259 #ifdef USE_OPENSSL
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260 free(ctx);
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261 #endif
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262 return rval;
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263
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264 } /* end generate_Ku() */
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265
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266 #else
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267 _KEYTOOLS_NOT_AVAILABLE
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268 #endif /* internal or openssl */
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269
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270
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271
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272
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273 /*******************************************************************-o-******
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274 * generate_kul
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275 *
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276 * Parameters:
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277 * *hashtype
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278 * hashtype_len
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279 * *engineID
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280 * engineID_len
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281 * *Ku Master key for a given user.
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282 * ku_len Length of Ku in bytes.
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283 * *Kul Localized key for a given user at engineID.
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284 * *kul_len Length of Kul buffer (IN); Length of Kul key (OUT).
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285 *
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286 * Returns:
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287 * SNMPERR_SUCCESS Success.
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288 * SNMPERR_GENERR All errors.
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289 *
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290 *
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291 * Ku MUST be the proper length (currently fixed) for the given hashtype.
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292 *
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293 * Upon successful return, Kul contains the localized form of Ku at
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294 * engineID, and the length of the key is stored in kul_len.
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295 *
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296 * The localized key method is defined in RFC2274, Sections 2.6 and A.2, and
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297 * originally documented in:
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298 * U. Blumenthal, N. C. Hien, B. Wijnen,
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299 * "Key Derivation for Network Management Applications",
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300 * IEEE Network Magazine, April/May issue, 1997.
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301 *
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302 *
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303 * ASSUMES SNMP_MAXBUF >= sizeof(Ku + engineID + Ku).
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304 *
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305 * NOTE Localized keys for privacy transforms are generated via
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306 * the authentication transform held by the same usmUser.
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307 *
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308 * XXX An engineID of any length is accepted, even if larger than
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309 * what is spec'ed for the textual convention.
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310 */
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311 int
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312 generate_kul( oid *hashtype, u_int hashtype_len,
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313 u_char *engineID, size_t engineID_len,
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314 u_char *Ku, size_t ku_len,
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315 u_char *Kul, size_t *kul_len)
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316 #if defined(USE_OPENSSL) || defined(USE_INTERNAL_MD5)
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317 {
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318 int rval = SNMPERR_SUCCESS;
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319 u_int nbytes = 0;
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320 size_t properlength;
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321
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322 u_char buf[SNMP_MAXBUF];
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323 void *context = NULL;
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324 #ifdef SNMP_TESTING_CODE
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325 int i;
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326 #endif
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327
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328
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329 /*
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330 * Sanity check.
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331 */
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332 if ( !hashtype || !engineID || !Ku || !Kul || !kul_len
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333 || (engineID_len<=0) || (ku_len<=0) || (*kul_len<=0)
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334 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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335 {
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336 QUITFUN(SNMPERR_GENERR, generate_kul_quit);
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337 }
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338
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339
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340 properlength = sc_get_properlength(hashtype, hashtype_len);
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341 if (properlength == SNMPERR_GENERR)
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342 QUITFUN(SNMPERR_GENERR, generate_kul_quit);
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343
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344
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345 if (((int)*kul_len < properlength) || ((int)ku_len < properlength) ) {
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346 QUITFUN(SNMPERR_GENERR, generate_kul_quit);
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347 }
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348
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349 /*
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350 * Concatenate Ku and engineID properly, then hash the result.
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351 * Store it in Kul.
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352 */
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353 nbytes = 0;
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354 memcpy(buf, Ku, properlength); nbytes += properlength;
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355 memcpy(buf+nbytes, engineID, engineID_len); nbytes += engineID_len;
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356 memcpy(buf+nbytes, Ku, properlength); nbytes += properlength;
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357
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358 rval = sc_hash(hashtype, hashtype_len, buf, nbytes, Kul, kul_len);
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359
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360 #ifdef SNMP_TESTING_CODE
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361 DEBUGMSGTL(("generate_kul", "generating Kul (from Ku): "));
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362 for(i=0; i < *kul_len; i++)
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363 DEBUGMSG(("generate_kul", "%02x",Kul[i]));
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364 DEBUGMSG(("generate_kul", "keytools\n"));
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365 #endif /* SNMP_TESTING_CODE */
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366
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367 QUITFUN(rval, generate_kul_quit);
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368
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369
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370 generate_kul_quit:
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371 SNMP_FREE(context);
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372 return rval;
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373
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374 } /* end generate_kul() */
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375
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376 #else
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377 _KEYTOOLS_NOT_AVAILABLE
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378 #endif /* internal or openssl */
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379
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380
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381
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382
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383 /*******************************************************************-o-******
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384 * encode_keychange
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385 *
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386 * Parameters:
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387 * *hashtype MIB OID for the hash transform type.
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388 * hashtype_len Length of the MIB OID hash transform type.
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389 * *oldkey Old key that is used to encodes the new key.
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390 * oldkey_len Length of oldkey in bytes.
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391 * *newkey New key that is encoded using the old key.
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392 * newkey_len Length of new key in bytes.
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393 * *kcstring Buffer to contain the KeyChange TC string.
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394 * *kcstring_len Length of kcstring buffer.
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395 *
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396 * Returns:
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397 * SNMPERR_SUCCESS Success.
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398 * SNMPERR_GENERR All errors.
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399 *
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400 *
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401 * Uses oldkey and acquired random bytes to encode newkey into kcstring
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402 * according to the rules of the KeyChange TC described in RFC 2274, Section 5.
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403 *
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404 * Upon successful return, *kcstring_len contains the length of the
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405 * encoded string.
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406 *
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407 * ASSUMES Old and new key are always equal to each other, although
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408 * this may be less than the transform type hash output
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409 * output length (eg, using KeyChange for a DESPriv key when
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410 * the user also uses SHA1Auth). This also implies that the
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411 * hash placed in the second 1/2 of the key change string
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412 * will be truncated before the XOR'ing when the hash output is
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413 * larger than that 1/2 of the key change string.
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414 *
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415 * *kcstring_len will be returned as exactly twice that same
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416 * length though the input buffer may be larger.
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417 *
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418 * XXX FIX: Does not handle varibable length keys.
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419 * XXX FIX: Does not handle keys larger than the hash algorithm used.
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420 */
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421 int
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422 encode_keychange( oid *hashtype, u_int hashtype_len,
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423 u_char *oldkey, size_t oldkey_len,
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424 u_char *newkey, size_t newkey_len,
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425 u_char *kcstring, size_t *kcstring_len)
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426 #if defined(USE_OPENSSL) || defined(USE_INTERNAL_MD5)
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427 {
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428 int rval = SNMPERR_SUCCESS;
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429 size_t properlength;
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430 size_t nbytes = 0;
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431
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432 u_char *tmpbuf = NULL;
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433 void *context = NULL;
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diff changeset
434
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435
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diff changeset
436 /*
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diff changeset
437 * Sanity check.
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438 */
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439 if ( !hashtype || !oldkey || !newkey || !kcstring || !kcstring_len
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440 || (oldkey_len<=0) || (newkey_len<=0) || (*kcstring_len<=0)
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441 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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442 {
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443 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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444 }
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445
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446 /*
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447 * Setup for the transform type.
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448 */
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449 properlength = sc_get_properlength(hashtype, hashtype_len);
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450 if (properlength == SNMPERR_GENERR)
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451 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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452
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453 if ( (oldkey_len != newkey_len) || (*kcstring_len < (2*oldkey_len)) )
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454 {
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455 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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456 }
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457
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458 properlength = SNMP_MIN((int)oldkey_len, properlength);
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459
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460 /*
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461 * Use the old key and some random bytes to encode the new key
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462 * in the KeyChange TC format:
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463 * . Get random bytes (store in first half of kcstring),
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464 * . Hash (oldkey | random_bytes) (into second half of kcstring),
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465 * . XOR hash and newkey (into second half of kcstring).
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466 *
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467 * Getting the wrong number of random bytes is considered an error.
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468 */
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469 nbytes = properlength;
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470
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471 #if defined(SNMP_TESTING_CODE) && defined(RANDOMZEROS)
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472 memset(kcstring, 0, nbytes);
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473 DEBUGMSG(("encode_keychange",
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474 "** Using all zero bits for \"random\" delta of )"
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475 "the keychange string! **\n"));
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476 #else /* !SNMP_TESTING_CODE */
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477 rval = sc_random(kcstring, &nbytes);
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478 QUITFUN(rval, encode_keychange_quit);
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479 if ((int)nbytes != properlength) {
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480 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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481 }
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482 #endif /* !SNMP_TESTING_CODE */
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483
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484 tmpbuf = (u_char *)malloc(properlength*2);
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485 if (tmpbuf) {
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486 memcpy(tmpbuf, oldkey, properlength);
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487 memcpy(tmpbuf+properlength, kcstring, properlength);
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488
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489 *kcstring_len -= properlength;
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490 rval = sc_hash(hashtype, hashtype_len, tmpbuf, properlength*2,
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491 kcstring+properlength, kcstring_len);
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492
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493 QUITFUN(rval, encode_keychange_quit);
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494
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495 *kcstring_len = (properlength*2);
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496
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497 kcstring += properlength;
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498 nbytes = 0;
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499 while ((int)(nbytes++) < properlength) {
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500 *kcstring++ = *kcstring ^ *newkey++;
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501 }
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502 }
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503
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504 encode_keychange_quit:
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505 if (rval != SNMPERR_SUCCESS) memset(kcstring, 0, *kcstring_len);
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506 SNMP_FREE(tmpbuf);
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507 SNMP_FREE(context);
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508
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509 return rval;
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510
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511 } /* end encode_keychange() */
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512
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513 #else
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514 _KEYTOOLS_NOT_AVAILABLE
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515 #endif /* internal or openssl */
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516
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diff changeset
517
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diff changeset
518
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519
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520 /*******************************************************************-o-******
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521 * decode_keychange
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522 *
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523 * Parameters:
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524 * *hashtype MIB OID of the hash transform to use.
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525 * hashtype_len Length of the hash transform MIB OID.
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526 * *oldkey Old key that is used to encode the new key.
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527 * oldkey_len Length of oldkey in bytes.
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528 * *kcstring Encoded KeyString buffer containing the new key.
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529 * kcstring_len Length of kcstring in bytes.
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530 * *newkey Buffer to hold the extracted new key.
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531 * *newkey_len Length of newkey in bytes.
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532 *
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533 * Returns:
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534 * SNMPERR_SUCCESS Success.
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535 * SNMPERR_GENERR All errors.
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diff changeset
536 *
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537 *
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538 * Decodes a string of bits encoded according to the KeyChange TC described
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539 * in RFC 2274, Section 5. The new key is extracted from *kcstring with
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540 * the aid of the old key.
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diff changeset
541 *
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542 * Upon successful return, *newkey_len contains the length of the new key.
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543 *
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diff changeset
544 *
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545 * ASSUMES Old key is exactly 1/2 the length of the KeyChange buffer,
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546 * although this length may be less than the hash transform
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547 * output. Thus the new key length will be equal to the old
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548 * key length.
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549 */
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550
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551 /* XXX: if the newkey is not long enough, it should be freed and remalloced */
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552 int
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553 decode_keychange( oid *hashtype, u_int hashtype_len,
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554 u_char *oldkey, size_t oldkey_len,
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555 u_char *kcstring, size_t kcstring_len,
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556 u_char *newkey, size_t *newkey_len)
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557 #if defined(USE_OPENSSL) || defined(USE_INTERNAL_MD5)
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diff changeset
558 {
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559 int rval = SNMPERR_SUCCESS;
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560 size_t properlength = 0;
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561 u_int nbytes = 0;
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diff changeset
562
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563 u_char *bufp,
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564 tmp_buf[SNMP_MAXBUF];
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565 size_t tmp_buf_len = SNMP_MAXBUF;
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566 void *context = NULL;
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567 u_char *tmpbuf = NULL;
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diff changeset
568
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569
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570
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571 /*
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572 * Sanity check.
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573 */
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574 if ( !hashtype || !oldkey || !kcstring || !newkey || !newkey_len
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575 || (oldkey_len<=0) || (kcstring_len<=0) || (*newkey_len<=0)
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576 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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577 {
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578 QUITFUN(SNMPERR_GENERR, decode_keychange_quit);
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579 }
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580
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581
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582 /*
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583 * Setup for the transform type.
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584 */
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585 properlength = sc_get_properlength(hashtype, hashtype_len);
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586 if (properlength == SNMPERR_GENERR)
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587 QUITFUN(SNMPERR_GENERR, decode_keychange_quit);
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588
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589
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590 if ( ((oldkey_len*2) != kcstring_len) || (*newkey_len < oldkey_len) )
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591 {
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592 QUITFUN(SNMPERR_GENERR, decode_keychange_quit);
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593 }
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594
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595 properlength = oldkey_len;
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596 *newkey_len = properlength;
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597
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598 /*
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599 * Use the old key and the given KeyChange TC string to recover
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600 * the new key:
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601 * . Hash (oldkey | random_bytes) (into newkey),
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602 * . XOR hash and encoded (second) half of kcstring (into newkey).
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603 */
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604 tmpbuf = (u_char *)malloc(properlength*2);
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605 if (tmpbuf) {
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606 memcpy(tmpbuf, oldkey, properlength);
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607 memcpy(tmpbuf+properlength, kcstring, properlength);
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608
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609 rval = sc_hash(hashtype, hashtype_len, tmpbuf, properlength*2,
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610 tmp_buf, &tmp_buf_len);
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611 QUITFUN(rval, decode_keychange_quit);
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612
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613 memcpy(newkey, tmp_buf, properlength);
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614 bufp = kcstring+properlength;
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615 nbytes = 0;
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616 while ((int)(nbytes++) < properlength) {
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617 *newkey++ = *newkey ^ *bufp++;
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618 }
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619 }
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620
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621 decode_keychange_quit:
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622 if (rval != SNMPERR_SUCCESS) {
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623 memset(newkey, 0, properlength);
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624 }
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625 memset(tmp_buf, 0, SNMP_MAXBUF);
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626 SNMP_FREE(context);
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627 if (tmpbuf != NULL) SNMP_FREE(tmpbuf);
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628
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629 return rval;
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630
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631 } /* end decode_keychange() */
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632
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633 #else
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634 _KEYTOOLS_NOT_AVAILABLE
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635 #endif /* internal or openssl */
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636