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annotate packages/net/snmp/lib/current/src/keytools.c @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 5357047a765d
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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 //==========================================================================
208
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7 //####ECOSGPLCOPYRIGHTBEGIN####
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8 // -------------------------------------------
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9 // This file is part of eCos, the Embedded Configurable Operating System.
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10 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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11 //
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12 // eCos is free software; you can redistribute it and/or modify it under
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13 // the terms of the GNU General Public License as published by the Free
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14 // Software Foundation; either version 2 or (at your option) any later version.
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15 //
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16 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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17 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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18 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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19 // for more details.
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20 //
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21 // You should have received a copy of the GNU General Public License along
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22 // with eCos; if not, write to the Free Software Foundation, Inc.,
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23 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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24 //
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25 // As a special exception, if other files instantiate templates or use macros
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26 // or inline functions from this file, or you compile this file and link it
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27 // with other works to produce a work based on this file, this file does not
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28 // by itself cause the resulting work to be covered by the GNU General Public
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29 // License. However the source code for this file must still be made available
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30 // in accordance with section (3) of the GNU General Public License.
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31 //
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32 // This exception does not invalidate any other reasons why a work based on
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33 // this file might be covered by the GNU General Public License.
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34 //
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35 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
210
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36 // at http://sources.redhat.com/ecos/ecos-license/
208
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37 // -------------------------------------------
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38 //####ECOSGPLCOPYRIGHTEND####
103
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39 //####UCDSNMPCOPYRIGHTBEGIN####
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40 //
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41 // -------------------------------------------
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42 //
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43 // Portions of this software may have been derived from the UCD-SNMP
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44 // project, <http://ucd-snmp.ucdavis.edu/> from the University of
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45 // California at Davis, which was originally based on the Carnegie Mellon
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46 // University SNMP implementation. Portions of this software are therefore
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47 // covered by the appropriate copyright disclaimers included herein.
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48 //
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49 // The release used was version 4.1.2 of May 2000. "ucd-snmp-4.1.2"
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50 // -------------------------------------------
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51 //
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52 //####UCDSNMPCOPYRIGHTEND####
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53 //==========================================================================
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54 //#####DESCRIPTIONBEGIN####
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55 //
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56 // Author(s): hmt
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57 // Contributors: hmt
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58 // Date: 2000-05-30
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59 // Purpose: Port of UCD-SNMP distribution to eCos.
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60 // Description:
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61 //
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62 //
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63 //####DESCRIPTIONEND####
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64 //
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65 //==========================================================================
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66 /********************************************************************
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67 Copyright 1989, 1991, 1992 by Carnegie Mellon University
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68
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69 Derivative Work -
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70 Copyright 1996, 1998, 1999, 2000 The Regents of the University of California
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71
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72 All Rights Reserved
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73
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74 Permission to use, copy, modify and distribute this software and its
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75 documentation for any purpose and without fee is hereby granted,
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76 provided that the above copyright notice appears in all copies and
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77 that both that copyright notice and this permission notice appear in
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78 supporting documentation, and that the name of CMU and The Regents of
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79 the University of California not be used in advertising or publicity
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80 pertaining to distribution of the software without specific written
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81 permission.
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82
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83 CMU AND THE REGENTS OF THE UNIVERSITY OF CALIFORNIA DISCLAIM ALL
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84 WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED
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85 WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL CMU OR
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86 THE REGENTS OF THE UNIVERSITY OF CALIFORNIA BE LIABLE FOR ANY SPECIAL,
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87 INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
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88 FROM THE LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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89 CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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90 CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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91 *********************************************************************/
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92 /*
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93 * keytools.c
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94 */
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95
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96 #include <config.h>
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97
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98 #include <stdio.h>
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99 #include <sys/types.h>
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100 #if HAVE_WINSOCK_H
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101 #include <winsock.h>
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102 #endif
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103 #ifdef HAVE_NETINET_IN_H
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104 #include <netinet/in.h>
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105 #endif
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106 #ifdef HAVE_STDLIB_H
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107 #include <stdlib.h>
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108 #endif
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109 #if HAVE_STRING_H
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110 #include <string.h>
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111 #else
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112 #include <strings.h>
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113 #endif
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114
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115 #if HAVE_DMALLOC_H
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116 #include <dmalloc.h>
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117 #endif
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118
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119 #include "asn1.h"
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120 #include "snmp_api.h"
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121 #ifdef USE_OPENSSL
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122 # include <openssl/hmac.h>
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123 #else
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124 #ifdef USE_INTERNAL_MD5
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125 #include "md5.h"
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126 #endif
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127 #endif
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128
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129 #include "scapi.h"
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130 #include "keytools.h"
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131 #include "tools.h"
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132 #include "snmp_debug.h"
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133 #include "snmp_logging.h"
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134
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135 #include "transform_oids.h"
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136
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137 /*******************************************************************-o-******
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138 * generate_Ku
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139 *
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140 * Parameters:
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141 * *hashtype MIB OID for the transform type for hashing.
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142 * hashtype_len Length of OID value.
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143 * *P Pre-allocated bytes of passpharase.
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144 * pplen Length of passphrase.
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145 * *Ku Buffer to contain Ku.
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146 * *kulen Length of Ku buffer.
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147 *
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148 * Returns:
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149 * SNMPERR_SUCCESS Success.
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150 * SNMPERR_GENERR All errors.
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151 *
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152 *
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153 * Convert a passphrase into a master user key, Ku, according to the
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154 * algorithm given in RFC 2274 concerning the SNMPv3 User Security Model (USM)
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155 * as follows:
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156 *
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157 * Expand the passphrase to fill the passphrase buffer space, if necessary,
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158 * concatenation as many duplicates as possible of P to itself. If P is
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159 * larger than the buffer space, truncate it to fit.
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160 *
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161 * Then hash the result with the given hashtype transform. Return
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162 * the result as Ku.
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163 *
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164 * If successful, kulen contains the size of the hash written to Ku.
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165 *
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166 * NOTE Passphrases less than USM_LENGTH_P_MIN characters in length
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167 * cause an error to be returned.
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168 * (Punt this check to the cmdline apps? XXX)
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169 */
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170 int
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171 generate_Ku( oid *hashtype, u_int hashtype_len,
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172 u_char *P, size_t pplen,
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173 u_char *Ku, size_t *kulen)
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174 #if defined(USE_INTERNAL_MD5) || defined(USE_OPENSSL)
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175 {
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176 int rval = SNMPERR_SUCCESS,
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177 nbytes = USM_LENGTH_EXPANDED_PASSPHRASE;
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178
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179 u_int i, pindex = 0;
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180
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181 u_char buf[USM_LENGTH_KU_HASHBLOCK],
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182 *bufp;
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183
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184 #ifdef USE_OPENSSL
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185 EVP_MD_CTX *ctx = malloc(sizeof(EVP_MD_CTX));
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186 #else
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187 MDstruct MD;
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188 #endif
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189 /*
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190 * Sanity check.
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191 */
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192 if ( !hashtype || !P || !Ku || !kulen
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193 || (*kulen<=0)
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194 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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195 {
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196 QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
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197 }
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198
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199 if (pplen < USM_LENGTH_P_MIN) {
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200 #ifdef SNMP_TESTING_CODE
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201 snmp_log(LOG_WARNING, "Warning: passphrase chosen is below the length requiremnts of the USM.\n");
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202 #else
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203 snmp_set_detail("Password length too short.");
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204 QUITFUN(SNMPERR_GENERR, generate_Ku_quit);
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205 #endif
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206 }
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207
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208
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209 /*
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210 * Setup for the transform type.
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211 */
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212 #ifdef USE_OPENSSL
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213
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214 if (ISTRANSFORM(hashtype, HMACMD5Auth))
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215 EVP_DigestInit(ctx, EVP_md5());
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216 else if (ISTRANSFORM(hashtype, HMACSHA1Auth))
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217 EVP_DigestInit(ctx, EVP_sha1());
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218 else {
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219 free(ctx);
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220 return (SNMPERR_GENERR);
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221 }
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222 #else
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223 MDbegin(&MD);
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224 #endif /* USE_OPENSSL */
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225
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226 while (nbytes > 0) {
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227 bufp = buf;
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228 for (i = 0; i < USM_LENGTH_KU_HASHBLOCK; i++) {
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229 *bufp++ = P[pindex++ % pplen];
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230 }
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231 #ifdef USE_OPENSSL
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232 EVP_DigestUpdate(ctx, buf, USM_LENGTH_KU_HASHBLOCK);
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233 #else
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234 if (MDupdate(&MD, buf, USM_LENGTH_KU_HASHBLOCK*8)) {
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235 rval = SNMPERR_USM_ENCRYPTIONERROR;
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236 goto md5_fin;
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237 }
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238 #endif /* USE_OPENSSL */
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239
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240 nbytes -= USM_LENGTH_KU_HASHBLOCK;
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241 }
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242
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243 #ifdef USE_OPENSSL
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244 EVP_DigestFinal(ctx, (unsigned char *) Ku, (unsigned int *) kulen);
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245 /* what about free() */
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246 #else
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247 if (MDupdate(&MD, buf, 0)) {
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248 rval = SNMPERR_USM_ENCRYPTIONERROR;
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249 goto md5_fin;
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250 }
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251 *kulen = sc_get_properlength(hashtype, hashtype_len);
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252 MDget(&MD, Ku, *kulen);
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253 md5_fin:
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254 memset(&MD, 0, sizeof(MD));
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255 #endif /* USE_OPENSSL */
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256
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257
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258 #ifdef SNMP_TESTING_CODE
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259 DEBUGMSGTL(("generate_Ku", "generating Ku (from %s): ", P));
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260 for(i=0; i < *kulen; i++)
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261 DEBUGMSG(("generate_Ku", "%02x",Ku[i]));
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262 DEBUGMSG(("generate_Ku","\n"));
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263 #endif /* SNMP_TESTING_CODE */
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264
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265
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266 generate_Ku_quit:
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267 memset(buf, 0, sizeof(buf));
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268 #ifdef USE_OPENSSL
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269 free(ctx);
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270 #endif
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271 return rval;
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272
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273 } /* end generate_Ku() */
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274
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275 #else
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276 _KEYTOOLS_NOT_AVAILABLE
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277 #endif /* internal or openssl */
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278
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279
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280
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281
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282 /*******************************************************************-o-******
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283 * generate_kul
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284 *
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285 * Parameters:
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286 * *hashtype
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287 * hashtype_len
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288 * *engineID
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289 * engineID_len
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290 * *Ku Master key for a given user.
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291 * ku_len Length of Ku in bytes.
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292 * *Kul Localized key for a given user at engineID.
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293 * *kul_len Length of Kul buffer (IN); Length of Kul key (OUT).
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294 *
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295 * Returns:
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296 * SNMPERR_SUCCESS Success.
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297 * SNMPERR_GENERR All errors.
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298 *
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299 *
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300 * Ku MUST be the proper length (currently fixed) for the given hashtype.
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301 *
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302 * Upon successful return, Kul contains the localized form of Ku at
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303 * engineID, and the length of the key is stored in kul_len.
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304 *
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305 * The localized key method is defined in RFC2274, Sections 2.6 and A.2, and
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306 * originally documented in:
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307 * U. Blumenthal, N. C. Hien, B. Wijnen,
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308 * "Key Derivation for Network Management Applications",
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309 * IEEE Network Magazine, April/May issue, 1997.
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310 *
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311 *
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312 * ASSUMES SNMP_MAXBUF >= sizeof(Ku + engineID + Ku).
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313 *
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314 * NOTE Localized keys for privacy transforms are generated via
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315 * the authentication transform held by the same usmUser.
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316 *
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317 * XXX An engineID of any length is accepted, even if larger than
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318 * what is spec'ed for the textual convention.
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319 */
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320 int
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321 generate_kul( oid *hashtype, u_int hashtype_len,
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322 u_char *engineID, size_t engineID_len,
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323 u_char *Ku, size_t ku_len,
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324 u_char *Kul, size_t *kul_len)
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325 #if defined(USE_OPENSSL) || defined(USE_INTERNAL_MD5)
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326 {
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327 int rval = SNMPERR_SUCCESS;
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328 u_int nbytes = 0;
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329 size_t properlength;
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330
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331 u_char buf[SNMP_MAXBUF];
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332 void *context = NULL;
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333 #ifdef SNMP_TESTING_CODE
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334 int i;
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335 #endif
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336
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337
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338 /*
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339 * Sanity check.
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340 */
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341 if ( !hashtype || !engineID || !Ku || !Kul || !kul_len
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342 || (engineID_len<=0) || (ku_len<=0) || (*kul_len<=0)
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343 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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344 {
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345 QUITFUN(SNMPERR_GENERR, generate_kul_quit);
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346 }
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347
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348
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349 properlength = sc_get_properlength(hashtype, hashtype_len);
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350 if (properlength == SNMPERR_GENERR)
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351 QUITFUN(SNMPERR_GENERR, generate_kul_quit);
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352
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353
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354 if (((int)*kul_len < properlength) || ((int)ku_len < properlength) ) {
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355 QUITFUN(SNMPERR_GENERR, generate_kul_quit);
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356 }
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357
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358 /*
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359 * Concatenate Ku and engineID properly, then hash the result.
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360 * Store it in Kul.
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361 */
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362 nbytes = 0;
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363 memcpy(buf, Ku, properlength); nbytes += properlength;
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364 memcpy(buf+nbytes, engineID, engineID_len); nbytes += engineID_len;
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365 memcpy(buf+nbytes, Ku, properlength); nbytes += properlength;
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366
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367 rval = sc_hash(hashtype, hashtype_len, buf, nbytes, Kul, kul_len);
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368
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369 #ifdef SNMP_TESTING_CODE
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370 DEBUGMSGTL(("generate_kul", "generating Kul (from Ku): "));
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371 for(i=0; i < *kul_len; i++)
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372 DEBUGMSG(("generate_kul", "%02x",Kul[i]));
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373 DEBUGMSG(("generate_kul", "keytools\n"));
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374 #endif /* SNMP_TESTING_CODE */
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375
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376 QUITFUN(rval, generate_kul_quit);
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377
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378
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379 generate_kul_quit:
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380 SNMP_FREE(context);
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381 return rval;
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382
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383 } /* end generate_kul() */
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384
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385 #else
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386 _KEYTOOLS_NOT_AVAILABLE
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387 #endif /* internal or openssl */
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388
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389
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390
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391
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392 /*******************************************************************-o-******
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393 * encode_keychange
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394 *
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395 * Parameters:
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396 * *hashtype MIB OID for the hash transform type.
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397 * hashtype_len Length of the MIB OID hash transform type.
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398 * *oldkey Old key that is used to encodes the new key.
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399 * oldkey_len Length of oldkey in bytes.
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400 * *newkey New key that is encoded using the old key.
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401 * newkey_len Length of new key in bytes.
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402 * *kcstring Buffer to contain the KeyChange TC string.
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403 * *kcstring_len Length of kcstring buffer.
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404 *
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405 * Returns:
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406 * SNMPERR_SUCCESS Success.
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407 * SNMPERR_GENERR All errors.
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408 *
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409 *
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410 * Uses oldkey and acquired random bytes to encode newkey into kcstring
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411 * according to the rules of the KeyChange TC described in RFC 2274, Section 5.
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412 *
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413 * Upon successful return, *kcstring_len contains the length of the
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414 * encoded string.
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415 *
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416 * ASSUMES Old and new key are always equal to each other, although
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417 * this may be less than the transform type hash output
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418 * output length (eg, using KeyChange for a DESPriv key when
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419 * the user also uses SHA1Auth). This also implies that the
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420 * hash placed in the second 1/2 of the key change string
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421 * will be truncated before the XOR'ing when the hash output is
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422 * larger than that 1/2 of the key change string.
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423 *
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424 * *kcstring_len will be returned as exactly twice that same
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425 * length though the input buffer may be larger.
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426 *
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427 * XXX FIX: Does not handle varibable length keys.
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diff changeset
428 * XXX FIX: Does not handle keys larger than the hash algorithm used.
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429 */
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430 int
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431 encode_keychange( oid *hashtype, u_int hashtype_len,
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432 u_char *oldkey, size_t oldkey_len,
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433 u_char *newkey, size_t newkey_len,
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434 u_char *kcstring, size_t *kcstring_len)
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435 #if defined(USE_OPENSSL) || defined(USE_INTERNAL_MD5)
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436 {
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437 int rval = SNMPERR_SUCCESS;
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438 size_t properlength;
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439 size_t nbytes = 0;
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440
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441 u_char *tmpbuf = NULL;
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442 void *context = NULL;
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443
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444
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445 /*
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446 * Sanity check.
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447 */
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448 if ( !hashtype || !oldkey || !newkey || !kcstring || !kcstring_len
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449 || (oldkey_len<=0) || (newkey_len<=0) || (*kcstring_len<=0)
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450 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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451 {
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452 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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453 }
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454
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455 /*
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456 * Setup for the transform type.
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457 */
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458 properlength = sc_get_properlength(hashtype, hashtype_len);
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459 if (properlength == SNMPERR_GENERR)
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460 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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461
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462 if ( (oldkey_len != newkey_len) || (*kcstring_len < (2*oldkey_len)) )
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463 {
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464 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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465 }
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466
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467 properlength = SNMP_MIN((int)oldkey_len, properlength);
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468
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469 /*
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470 * Use the old key and some random bytes to encode the new key
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471 * in the KeyChange TC format:
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472 * . Get random bytes (store in first half of kcstring),
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473 * . Hash (oldkey | random_bytes) (into second half of kcstring),
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474 * . XOR hash and newkey (into second half of kcstring).
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475 *
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476 * Getting the wrong number of random bytes is considered an error.
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477 */
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478 nbytes = properlength;
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479
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480 #if defined(SNMP_TESTING_CODE) && defined(RANDOMZEROS)
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481 memset(kcstring, 0, nbytes);
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482 DEBUGMSG(("encode_keychange",
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483 "** Using all zero bits for \"random\" delta of )"
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484 "the keychange string! **\n"));
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485 #else /* !SNMP_TESTING_CODE */
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486 rval = sc_random(kcstring, &nbytes);
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487 QUITFUN(rval, encode_keychange_quit);
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488 if ((int)nbytes != properlength) {
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489 QUITFUN(SNMPERR_GENERR, encode_keychange_quit);
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490 }
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491 #endif /* !SNMP_TESTING_CODE */
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492
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493 tmpbuf = (u_char *)malloc(properlength*2);
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494 if (tmpbuf) {
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495 memcpy(tmpbuf, oldkey, properlength);
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496 memcpy(tmpbuf+properlength, kcstring, properlength);
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497
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498 *kcstring_len -= properlength;
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499 rval = sc_hash(hashtype, hashtype_len, tmpbuf, properlength*2,
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500 kcstring+properlength, kcstring_len);
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501
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502 QUITFUN(rval, encode_keychange_quit);
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503
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504 *kcstring_len = (properlength*2);
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505
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506 kcstring += properlength;
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507 nbytes = 0;
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508 while ((int)(nbytes++) < properlength) {
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509 *kcstring++ = *kcstring ^ *newkey++;
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510 }
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511 }
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512
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513 encode_keychange_quit:
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514 if (rval != SNMPERR_SUCCESS) memset(kcstring, 0, *kcstring_len);
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515 SNMP_FREE(tmpbuf);
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516 SNMP_FREE(context);
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517
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518 return rval;
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519
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520 } /* end encode_keychange() */
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521
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522 #else
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523 _KEYTOOLS_NOT_AVAILABLE
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524 #endif /* internal or openssl */
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525
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526
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527
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528
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529 /*******************************************************************-o-******
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530 * decode_keychange
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531 *
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532 * Parameters:
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533 * *hashtype MIB OID of the hash transform to use.
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534 * hashtype_len Length of the hash transform MIB OID.
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535 * *oldkey Old key that is used to encode the new key.
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536 * oldkey_len Length of oldkey in bytes.
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537 * *kcstring Encoded KeyString buffer containing the new key.
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538 * kcstring_len Length of kcstring in bytes.
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539 * *newkey Buffer to hold the extracted new key.
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540 * *newkey_len Length of newkey in bytes.
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541 *
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542 * Returns:
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543 * SNMPERR_SUCCESS Success.
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544 * SNMPERR_GENERR All errors.
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diff changeset
545 *
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546 *
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547 * Decodes a string of bits encoded according to the KeyChange TC described
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548 * in RFC 2274, Section 5. The new key is extracted from *kcstring with
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549 * the aid of the old key.
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diff changeset
550 *
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551 * Upon successful return, *newkey_len contains the length of the new key.
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552 *
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553 *
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554 * ASSUMES Old key is exactly 1/2 the length of the KeyChange buffer,
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555 * although this length may be less than the hash transform
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556 * output. Thus the new key length will be equal to the old
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diff changeset
557 * key length.
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558 */
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559
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560 /* XXX: if the newkey is not long enough, it should be freed and remalloced */
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561 int
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562 decode_keychange( oid *hashtype, u_int hashtype_len,
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563 u_char *oldkey, size_t oldkey_len,
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564 u_char *kcstring, size_t kcstring_len,
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565 u_char *newkey, size_t *newkey_len)
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566 #if defined(USE_OPENSSL) || defined(USE_INTERNAL_MD5)
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567 {
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568 int rval = SNMPERR_SUCCESS;
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569 size_t properlength = 0;
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570 u_int nbytes = 0;
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571
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572 u_char *bufp,
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573 tmp_buf[SNMP_MAXBUF];
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574 size_t tmp_buf_len = SNMP_MAXBUF;
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575 void *context = NULL;
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576 u_char *tmpbuf = NULL;
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577
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578
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579
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580 /*
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581 * Sanity check.
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582 */
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583 if ( !hashtype || !oldkey || !kcstring || !newkey || !newkey_len
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584 || (oldkey_len<=0) || (kcstring_len<=0) || (*newkey_len<=0)
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585 || (hashtype_len != USM_LENGTH_OID_TRANSFORM) )
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586 {
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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
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591 /*
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592 * Setup for the transform type.
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593 */
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594 properlength = sc_get_properlength(hashtype, hashtype_len);
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595 if (properlength == SNMPERR_GENERR)
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596 QUITFUN(SNMPERR_GENERR, decode_keychange_quit);
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597
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598
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599 if ( ((oldkey_len*2) != kcstring_len) || (*newkey_len < oldkey_len) )
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600 {
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601 QUITFUN(SNMPERR_GENERR, decode_keychange_quit);
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602 }
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603
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604 properlength = oldkey_len;
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605 *newkey_len = properlength;
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606
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607 /*
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608 * Use the old key and the given KeyChange TC string to recover
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609 * the new key:
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610 * . Hash (oldkey | random_bytes) (into newkey),
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611 * . XOR hash and encoded (second) half of kcstring (into newkey).
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612 */
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613 tmpbuf = (u_char *)malloc(properlength*2);
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614 if (tmpbuf) {
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615 memcpy(tmpbuf, oldkey, properlength);
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616 memcpy(tmpbuf+properlength, kcstring, properlength);
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617
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618 rval = sc_hash(hashtype, hashtype_len, tmpbuf, properlength*2,
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619 tmp_buf, &tmp_buf_len);
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620 QUITFUN(rval, decode_keychange_quit);
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621
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622 memcpy(newkey, tmp_buf, properlength);
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623 bufp = kcstring+properlength;
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624 nbytes = 0;
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625 while ((int)(nbytes++) < properlength) {
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626 *newkey++ = *newkey ^ *bufp++;
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627 }
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628 }
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629
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630 decode_keychange_quit:
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631 if (rval != SNMPERR_SUCCESS) {
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632 memset(newkey, 0, properlength);
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633 }
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634 memset(tmp_buf, 0, SNMP_MAXBUF);
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635 SNMP_FREE(context);
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636 if (tmpbuf != NULL) SNMP_FREE(tmpbuf);
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637
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638 return rval;
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639
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640 } /* end decode_keychange() */
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641
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642 #else
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643 _KEYTOOLS_NOT_AVAILABLE
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644 #endif /* internal or openssl */
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645