1 | /* $Id: asn1-encode.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - ASN.1, Encoding.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2017 Oracle Corporation
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8 | *
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9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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10 | * available from http://www.virtualbox.org. This file is free software;
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11 | * you can redistribute it and/or modify it under the terms of the GNU
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12 | * General Public License (GPL) as published by the Free Software
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13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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16 | *
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17 | * The contents of this file may alternatively be used under the terms
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18 | * of the Common Development and Distribution License Version 1.0
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19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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20 | * VirtualBox OSE distribution, in which case the provisions of the
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21 | * CDDL are applicable instead of those of the GPL.
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22 | *
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23 | * You may elect to license modified versions of this file under the
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24 | * terms and conditions of either the GPL or the CDDL or both.
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25 | */
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26 |
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27 |
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28 | /*********************************************************************************************************************************
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29 | * Header Files *
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30 | *********************************************************************************************************************************/
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31 | #include "internal/iprt.h"
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32 | #include <iprt/asn1.h>
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33 |
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34 | #include <iprt/assert.h>
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35 | #include <iprt/bignum.h>
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36 | #include <iprt/ctype.h>
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37 | #include <iprt/err.h>
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38 | #include <iprt/string.h>
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39 |
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40 | #include <iprt/formats/asn1.h>
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41 |
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42 |
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43 | /*********************************************************************************************************************************
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44 | * Structures and Typedefs *
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45 | *********************************************************************************************************************************/
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46 | /**
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47 | * Argument package for rtAsn1EncodePrepareCallback passed by RTAsn1EncodePrepare.
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48 | */
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49 | typedef struct RTASN1ENCODEPREPARGS
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50 | {
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51 | /** The size at this level. */
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52 | uint32_t cb;
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53 | /** RTASN1ENCODE_F_XXX. */
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54 | uint32_t fFlags;
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55 | /** Pointer to the error info. (optional) */
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56 | PRTERRINFO pErrInfo;
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57 | } RTASN1ENCODEPREPARGS;
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58 |
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59 |
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60 | /**
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61 | * Argument package for rtAsn1EncodeWriteCallback passed by RTAsn1EncodeWrite.
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62 | */
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63 | typedef struct RTASN1ENCODEWRITEARGS
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64 | {
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65 | /** RTASN1ENCODE_F_XXX. */
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66 | uint32_t fFlags;
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67 | /** Pointer to the writer funtion. */
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68 | PFNRTASN1ENCODEWRITER pfnWriter;
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69 | /** User argument to the writer function. */
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70 | void *pvUser;
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71 | /** Pointer to the error info. (optional) */
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72 | PRTERRINFO pErrInfo;
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73 | } RTASN1ENCODEWRITEARGS;
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74 |
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75 | /**
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76 | * Argument package for rtAsn1EncodeToBufferCallback passed by
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77 | * RTAsn1EncodeToBuffer.
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78 | */
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79 | typedef struct RTASN1ENCODETOBUFARGS
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80 | {
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81 | /** The destination buffer position (incremented while writing). */
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82 | uint8_t *pbDst;
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83 | /** The size of the destination buffer left (decremented while writing). */
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84 | size_t cbDst;
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85 | } RTASN1ENCODETOBUFARGS;
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86 |
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87 |
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88 | RTDECL(int) RTAsn1EncodeRecalcHdrSize(PRTASN1CORE pAsn1Core, uint32_t fFlags, PRTERRINFO pErrInfo)
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89 | {
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90 | AssertReturn((fFlags & RTASN1ENCODE_F_RULE_MASK) == RTASN1ENCODE_F_DER, VERR_INVALID_FLAGS);
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91 | int rc = VINF_SUCCESS;
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92 |
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93 | uint8_t cbHdr;
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94 | if ((pAsn1Core->fFlags & (RTASN1CORE_F_PRESENT | RTASN1CORE_F_DUMMY | RTASN1CORE_F_DEFAULT)) == RTASN1CORE_F_PRESENT)
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95 | {
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96 | /*
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97 | * The minimum header size is two bytes.
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98 | */
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99 | cbHdr = 2;
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100 |
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101 | /*
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102 | * Add additional bytes for encoding the tag.
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103 | */
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104 | uint32_t uTag = pAsn1Core->uTag;
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105 | if (uTag >= ASN1_TAG_USE_LONG_FORM)
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106 | {
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107 | AssertReturn(pAsn1Core->uTag != UINT32_MAX, RTErrInfoSet(pErrInfo, VERR_ASN1_DUMMY_OBJECT, "uTag=UINT32_MAX"));
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108 | do
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109 | {
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110 | cbHdr++;
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111 | uTag >>= 7;
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112 | } while (uTag > 0);
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113 | }
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114 |
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115 | /*
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116 | * Add additional bytes for encoding the content length.
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117 | */
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118 | uint32_t cb = pAsn1Core->cb;
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119 | if (cb >= 0x80)
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120 | {
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121 | AssertReturn(cb < _1G, RTErrInfoSetF(pErrInfo, VERR_ASN1_TOO_LONG, "cb=%u (%#x)", cb, cb));
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122 |
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123 | if (cb <= UINT32_C(0xffff))
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124 | {
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125 | if (cb <= UINT32_C(0xff))
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126 | cbHdr += 1;
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127 | else
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128 | cbHdr += 2;
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129 | }
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130 | else
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131 | {
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132 | if (cb <= UINT32_C(0xffffff))
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133 | cbHdr += 3;
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134 | else
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135 | cbHdr += 4;
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136 | }
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137 | }
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138 | }
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139 | /*
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140 | * Not present, dummy or otherwise not encoded.
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141 | */
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142 | else
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143 | {
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144 | cbHdr = 0;
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145 | if (pAsn1Core->fFlags & RTASN1CORE_F_DEFAULT)
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146 | rc = VINF_ASN1_NOT_ENCODED;
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147 | else
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148 | {
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149 | Assert(RTASN1CORE_IS_DUMMY(pAsn1Core));
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150 | Assert(pAsn1Core->pOps && pAsn1Core->pOps->pfnEnum);
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151 | rc = VINF_SUCCESS;
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152 | }
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153 | }
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154 |
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155 | /*
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156 | * Update the header length.
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157 | */
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158 | pAsn1Core->cbHdr = cbHdr;
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159 | return rc;
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160 | }
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161 |
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162 |
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163 | /**
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164 | * @callback_method_impl{FNRTASN1ENUMCALLBACK}
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165 | */
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166 | static DECLCALLBACK(int) rtAsn1EncodePrepareCallback(PRTASN1CORE pAsn1Core, const char *pszName, uint32_t uDepth, void *pvUser)
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167 | {
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168 | RTASN1ENCODEPREPARGS *pArgs = (RTASN1ENCODEPREPARGS *)pvUser;
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169 | RT_NOREF_PV(pszName);
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170 | if (RTASN1CORE_IS_PRESENT(pAsn1Core))
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171 | {
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172 | /*
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173 | * Depth first, where relevant.
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174 | */
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175 | uint32_t const cbSaved = pArgs->cb;
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176 | if (pAsn1Core->pOps)
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177 | {
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178 | /*
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179 | * Use the encoding preparation method when available.
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180 | */
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181 | int rc;
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182 | if (pAsn1Core->pOps->pfnEncodePrep)
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183 | rc = pAsn1Core->pOps->pfnEncodePrep(pAsn1Core, pArgs->fFlags, pArgs->pErrInfo);
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184 | else if (pAsn1Core->pOps->pfnEnum)
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185 | {
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186 | /*
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187 | * Recurse to prepare the child objects (if any).
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188 | */
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189 | rc = pAsn1Core->pOps->pfnEnum(pAsn1Core, rtAsn1EncodePrepareCallback, uDepth + 1, pArgs);
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190 | if (RT_SUCCESS(rc))
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191 | pAsn1Core->cb = pArgs->cb - cbSaved;
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192 | }
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193 | else
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194 | {
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195 | /*
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196 | * Must be a primitive type if DER.
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197 | */
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198 | if ( (pAsn1Core->fClass & ASN1_TAGFLAG_CONSTRUCTED)
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199 | && (pArgs->fFlags & RTASN1ENCODE_F_DER) )
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200 | return RTErrInfoSetF(pArgs->pErrInfo, VERR_ASN1_EXPECTED_PRIMITIVE,
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201 | "Expected primitive ASN.1 object: uTag=%#x fClass=%#x cb=%u",
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202 | RTASN1CORE_GET_TAG(pAsn1Core), pAsn1Core->fClass, pAsn1Core->cb);
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203 | rc = VINF_SUCCESS;
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204 | }
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205 | if (RT_SUCCESS(rc))
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206 | rc = RTAsn1EncodeRecalcHdrSize(pAsn1Core, pArgs->fFlags, pArgs->pErrInfo);
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207 | if (RT_FAILURE(rc))
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208 | return rc;
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209 | }
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210 | else
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211 | {
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212 | AssertFailed();
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213 | pAsn1Core->cb = 0;
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214 | pAsn1Core->cbHdr = 0;
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215 | }
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216 |
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217 | /*
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218 | * Recalculate the output size, thus far. Dummy objects propagates the
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219 | * content size, but the header size is zero. Other objects with
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220 | * header size zero are not encoded and should be omitted entirely.
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221 | */
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222 | if (pAsn1Core->cbHdr > 0 || RTASN1CORE_IS_DUMMY(pAsn1Core))
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223 | pArgs->cb = RTASN1CORE_GET_RAW_ASN1_SIZE(pAsn1Core) + cbSaved;
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224 | else
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225 | pArgs->cb = cbSaved;
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226 | }
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227 |
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228 | return VINF_SUCCESS;
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229 | }
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230 |
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231 |
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232 | RTDECL(int) RTAsn1EncodePrepare(PRTASN1CORE pRoot, uint32_t fFlags, uint32_t *pcbEncoded, PRTERRINFO pErrInfo)
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233 | {
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234 | AssertReturn((fFlags & RTASN1ENCODE_F_RULE_MASK) == RTASN1ENCODE_F_DER, VERR_INVALID_FLAGS);
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235 |
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236 | /*
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237 | * This is implemented as a recursive enumeration of the ASN.1 object structure.
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238 | */
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239 | RTASN1ENCODEPREPARGS Args;
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240 | Args.cb = 0;
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241 | Args.fFlags = fFlags;
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242 | Args.pErrInfo = pErrInfo;
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243 | int rc = rtAsn1EncodePrepareCallback(pRoot, "root", 0, &Args);
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244 | if (pcbEncoded)
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245 | *pcbEncoded = RTASN1CORE_GET_RAW_ASN1_SIZE(pRoot);
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246 | return rc;
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247 | }
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248 |
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249 |
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250 | RTDECL(int) RTAsn1EncodeWriteHeader(PCRTASN1CORE pAsn1Core, uint32_t fFlags, FNRTASN1ENCODEWRITER pfnWriter, void *pvUser,
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251 | PRTERRINFO pErrInfo)
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252 | {
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253 | AssertReturn((fFlags & RTASN1ENCODE_F_RULE_MASK) == RTASN1ENCODE_F_DER, VERR_INVALID_FLAGS);
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254 |
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255 | if ((pAsn1Core->fFlags & (RTASN1CORE_F_PRESENT | RTASN1CORE_F_DUMMY | RTASN1CORE_F_DEFAULT)) == RTASN1CORE_F_PRESENT)
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256 | {
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257 | uint8_t abHdr[16]; /* 2 + max 5 tag + max 4 length = 11 */
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258 | uint8_t *pbDst = &abHdr[0];
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259 |
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260 | /*
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261 | * Encode the tag.
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262 | */
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263 | uint32_t uTag = pAsn1Core->uTag;
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264 | if (uTag < ASN1_TAG_USE_LONG_FORM)
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265 | *pbDst++ = (uint8_t)uTag | (pAsn1Core->fClass & ~ASN1_TAG_MASK);
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266 | else
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267 | {
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268 | AssertReturn(pAsn1Core->uTag != UINT32_MAX, RTErrInfoSet(pErrInfo, VERR_ASN1_DUMMY_OBJECT, "uTag=UINT32_MAX"));
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269 |
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270 | /* In the long form, the tag is encoded MSB style with the 8th bit
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271 | of each byte indicating the whether there are more byte. */
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272 | *pbDst++ = ASN1_TAG_USE_LONG_FORM | (pAsn1Core->fClass & ~ASN1_TAG_MASK);
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273 | if (uTag <= UINT32_C(0x7f))
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274 | *pbDst++ = uTag;
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275 | else if (uTag <= UINT32_C(0x3fff)) /* 2**(7*2) = 0x4000 (16384) */
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276 | {
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277 | *pbDst++ = (uTag >> 7) | 0x80;
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278 | *pbDst++ = uTag & 0x7f;
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279 | }
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280 | else if (uTag <= UINT32_C(0x1fffff)) /* 2**(7*3) = 0x200000 (2097152) */
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281 | {
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282 | *pbDst++ = (uTag >> 14) | 0x80;
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283 | *pbDst++ = ((uTag >> 7) & 0x7f) | 0x80;
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284 | *pbDst++ = uTag & 0x7f;
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285 | }
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286 | else if (uTag <= UINT32_C(0xfffffff)) /* 2**(7*4) = 0x10000000 (268435456) */
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287 | {
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288 | *pbDst++ = (uTag >> 21) | 0x80;
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289 | *pbDst++ = ((uTag >> 14) & 0x7f) | 0x80;
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290 | *pbDst++ = ((uTag >> 7) & 0x7f) | 0x80;
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291 | *pbDst++ = uTag & 0x7f;
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292 | }
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293 | else
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294 | {
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295 | *pbDst++ = (uTag >> 28) | 0x80;
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296 | *pbDst++ = ((uTag >> 21) & 0x7f) | 0x80;
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297 | *pbDst++ = ((uTag >> 14) & 0x7f) | 0x80;
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298 | *pbDst++ = ((uTag >> 7) & 0x7f) | 0x80;
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299 | *pbDst++ = uTag & 0x7f;
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300 | }
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301 | }
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302 |
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303 | /*
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304 | * Encode the length.
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305 | */
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306 | uint32_t cb = pAsn1Core->cb;
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307 | if (cb < 0x80)
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308 | *pbDst++ = (uint8_t)cb;
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309 | else
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310 | {
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311 | AssertReturn(cb < _1G, RTErrInfoSetF(pErrInfo, VERR_ASN1_TOO_LONG, "cb=%u (%#x)", cb, cb));
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312 |
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313 | if (cb <= UINT32_C(0xffff))
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314 | {
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315 | if (cb <= UINT32_C(0xff))
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316 | {
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317 | pbDst[0] = 0x81;
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318 | pbDst[1] = (uint8_t)cb;
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319 | pbDst += 2;
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320 | }
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321 | else
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322 | {
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323 | pbDst[0] = 0x82;
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324 | pbDst[1] = cb >> 8;
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325 | pbDst[2] = (uint8_t)cb;
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326 | pbDst += 3;
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327 | }
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328 | }
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329 | else
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330 | {
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331 | if (cb <= UINT32_C(0xffffff))
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332 | {
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333 | pbDst[0] = 0x83;
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334 | pbDst[1] = (uint8_t)(cb >> 16);
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335 | pbDst[2] = (uint8_t)(cb >> 8);
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336 | pbDst[3] = (uint8_t)cb;
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337 | pbDst += 4;
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338 | }
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339 | else
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340 | {
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341 | pbDst[0] = 0x84;
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342 | pbDst[1] = (uint8_t)(cb >> 24);
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343 | pbDst[2] = (uint8_t)(cb >> 16);
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344 | pbDst[3] = (uint8_t)(cb >> 8);
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345 | pbDst[4] = (uint8_t)cb;
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346 | pbDst += 5;
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347 | }
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348 | }
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349 | }
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350 |
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351 | size_t const cbHdr = pbDst - &abHdr[0];
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352 | Assert(sizeof(abHdr) >= cbHdr);
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353 | Assert(pAsn1Core->cbHdr == cbHdr);
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354 |
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355 | /*
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356 | * Write it.
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357 | */
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358 | return pfnWriter(abHdr, cbHdr, pvUser, pErrInfo);
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359 | }
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360 |
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361 | /*
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362 | * Not present, dummy or otherwise not encoded.
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363 | */
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364 | Assert(pAsn1Core->cbHdr == 0);
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365 | if (pAsn1Core->fFlags & RTASN1CORE_F_DEFAULT)
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366 | return VINF_ASN1_NOT_ENCODED;
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367 | Assert(RTASN1CORE_IS_DUMMY(pAsn1Core));
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368 | Assert(pAsn1Core->pOps && pAsn1Core->pOps->pfnEnum);
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369 | return VINF_SUCCESS;
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370 | }
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371 |
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372 |
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373 | /**
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374 | * @callback_method_impl{FNRTASN1ENUMCALLBACK}
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375 | */
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376 | static DECLCALLBACK(int) rtAsn1EncodeWriteCallback(PRTASN1CORE pAsn1Core, const char *pszName, uint32_t uDepth, void *pvUser)
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377 | {
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378 | RTASN1ENCODEWRITEARGS *pArgs = (RTASN1ENCODEWRITEARGS *)pvUser;
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379 | RT_NOREF_PV(pszName);
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380 | int rc;
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381 | if (RTASN1CORE_IS_PRESENT(pAsn1Core))
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382 | {
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383 | /*
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384 | * If there is an write method, use it.
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385 | */
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386 | if ( pAsn1Core->pOps
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387 | && pAsn1Core->pOps->pfnEncodeWrite)
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388 | rc = pAsn1Core->pOps->pfnEncodeWrite(pAsn1Core, pArgs->fFlags, pArgs->pfnWriter, pArgs->pvUser, pArgs->pErrInfo);
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389 | else
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390 | {
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391 | /*
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392 | * Generic path. Start by writing the header for this object.
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393 | */
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394 | rc = RTAsn1EncodeWriteHeader(pAsn1Core, pArgs->fFlags, pArgs->pfnWriter, pArgs->pvUser, pArgs->pErrInfo);
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395 | if (RT_SUCCESS(rc))
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396 | {
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397 | /*
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398 | * If there is an enum function, call it to assemble the content.
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399 | * Otherwise ASSUME the pointer in the header points to the content.
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400 | */
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401 | if ( pAsn1Core->pOps
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402 | && pAsn1Core->pOps->pfnEnum)
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403 | {
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404 | if (rc != VINF_ASN1_NOT_ENCODED)
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405 | rc = pAsn1Core->pOps->pfnEnum(pAsn1Core, rtAsn1EncodeWriteCallback, uDepth + 1, pArgs);
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406 | }
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407 | else if (pAsn1Core->cb && rc != VINF_ASN1_NOT_ENCODED)
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408 | {
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409 | Assert(!RTASN1CORE_IS_DUMMY(pAsn1Core));
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410 | AssertPtrReturn(pAsn1Core->uData.pv,
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411 | RTErrInfoSetF(pArgs->pErrInfo, VERR_ASN1_INVALID_DATA_POINTER,
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412 | "Invalid uData pointer %p for no pfnEnum object with %#x bytes of content",
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413 | pAsn1Core->uData.pv, pAsn1Core->cb));
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414 | rc = pArgs->pfnWriter(pAsn1Core->uData.pv, pAsn1Core->cb, pArgs->pvUser, pArgs->pErrInfo);
|
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415 | }
|
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416 | }
|
---|
417 | }
|
---|
418 | if (RT_SUCCESS(rc))
|
---|
419 | rc = VINF_SUCCESS;
|
---|
420 | }
|
---|
421 | else
|
---|
422 | rc = VINF_SUCCESS;
|
---|
423 | return rc;
|
---|
424 | }
|
---|
425 |
|
---|
426 |
|
---|
427 | RTDECL(int) RTAsn1EncodeWrite(PCRTASN1CORE pRoot, uint32_t fFlags, FNRTASN1ENCODEWRITER pfnWriter, void *pvUser,
|
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428 | PRTERRINFO pErrInfo)
|
---|
429 | {
|
---|
430 | AssertReturn((fFlags & RTASN1ENCODE_F_RULE_MASK) == RTASN1ENCODE_F_DER, VERR_INVALID_FLAGS);
|
---|
431 |
|
---|
432 | /*
|
---|
433 | * This is implemented as a recursive enumeration of the ASN.1 object structure.
|
---|
434 | */
|
---|
435 | RTASN1ENCODEWRITEARGS Args;
|
---|
436 | Args.fFlags = fFlags;
|
---|
437 | Args.pfnWriter = pfnWriter;
|
---|
438 | Args.pvUser = pvUser;
|
---|
439 | Args.pErrInfo = pErrInfo;
|
---|
440 | return rtAsn1EncodeWriteCallback((PRTASN1CORE)pRoot, "root", 0, &Args);
|
---|
441 | }
|
---|
442 |
|
---|
443 |
|
---|
444 | static DECLCALLBACK(int) rtAsn1EncodeToBufferCallback(const void *pvBuf, size_t cbToWrite, void *pvUser, PRTERRINFO pErrInfo)
|
---|
445 | {
|
---|
446 | RTASN1ENCODETOBUFARGS *pArgs = (RTASN1ENCODETOBUFARGS *)pvUser;
|
---|
447 | if (RT_LIKELY(pArgs->cbDst >= cbToWrite))
|
---|
448 | {
|
---|
449 | memcpy(pArgs->pbDst, pvBuf, cbToWrite);
|
---|
450 | pArgs->cbDst -= cbToWrite;
|
---|
451 | pArgs->pbDst += cbToWrite;
|
---|
452 | return VINF_SUCCESS;
|
---|
453 | }
|
---|
454 |
|
---|
455 | /*
|
---|
456 | * Overflow.
|
---|
457 | */
|
---|
458 | if (pArgs->cbDst)
|
---|
459 | {
|
---|
460 | memcpy(pArgs->pbDst, pvBuf, pArgs->cbDst);
|
---|
461 | pArgs->pbDst -= pArgs->cbDst;
|
---|
462 | pArgs->cbDst = 0;
|
---|
463 | }
|
---|
464 | RT_NOREF_PV(pErrInfo);
|
---|
465 | return VERR_BUFFER_OVERFLOW;
|
---|
466 | }
|
---|
467 |
|
---|
468 |
|
---|
469 | RTDECL(int) RTAsn1EncodeToBuffer(PCRTASN1CORE pRoot, uint32_t fFlags, void *pvBuf, size_t cbBuf, PRTERRINFO pErrInfo)
|
---|
470 | {
|
---|
471 | RTASN1ENCODETOBUFARGS Args;
|
---|
472 | Args.pbDst = (uint8_t *)pvBuf;
|
---|
473 | Args.cbDst = cbBuf;
|
---|
474 | return RTAsn1EncodeWrite(pRoot, fFlags, rtAsn1EncodeToBufferCallback, &Args, pErrInfo);
|
---|
475 | }
|
---|
476 |
|
---|