OSX/libsecurity_asn1/Security/nameTemplates.c

   1 /*
   2  * Copyright (c) 2003-2006,2008,2010-2012,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  *
  23  * nameTemplates.c - ASN1 templates for X509 Name, GeneralName, etc.
  24  */
  25
  26 #include "SecAsn1Templates.h"
  27 #include "nameTemplates.h"
  28 #include "X509Templates.h"
  29 #include "keyTemplates.h"
  30 #include <stddef.h>
  31 #include <assert.h>
  32
  33 typedef struct {
  34     SecAsn1Oid typeId;
  35     SecAsn1Item value; // unparsed, BER-encoded
  36 } CE_OtherName;
  37
  38 // MARK: ----- Generalized NSS_TaggedItem template chooser support -----
  39
  40 /*
  41  * Generalized Template chooser.
  42  */
  43 const SecAsn1Template * SecAsn1TaggedTemplateChooser(
  44         /* Four args passed to specific SecAsn1TemplateChooser */
  45         void *arg,                              // currently not used
  46         Boolean enc,
  47         const char *buf,
  48         void *dest,
  49         /* array of tag/template pairs */
  50         const NSS_TagChoice *chooser)
  51 {
  52         unsigned char tag = 0;
  53         const SecAsn1Template *templ = NULL;
  54         NSS_TaggedItem *item = (NSS_TaggedItem *)dest;
  55
  56         assert(item != NULL);
  57         assert((chooser != NULL) && (chooser->templ != NULL));
  58
  59         if(enc) {
  60                 /* encoding: tag from an NSS_TaggedItem at *dest */
  61                 tag = item->tag;
  62         }
  63         else {
  64                 /* decoding: tag from raw bytes being decoded */
  65                 tag = buf[0] & SEC_ASN1_TAGNUM_MASK;
  66                 /* and tell caller what's coming */
  67                 item->tag = tag;
  68         }
  69
  70         /* infer template from tag */
  71         const NSS_TagChoice *thisChoice;
  72         for(thisChoice=chooser; thisChoice->templ != NULL; thisChoice++) {
  73                 if(tag == thisChoice->tag) {
  74                         templ = thisChoice->templ;
  75                         break;
  76                 }
  77         }
  78         if(templ == NULL) {
  79                 /*
  80                  * Tag not found. On decoding, this is the caller's fault
  81                  * and they'll have to deal with it.
  82                  * On decode, pick a template guaranteed to cause a decoding
  83                  * failure - the template from the first array of
  84                  * NSS_TagChoices should do the trick since its tag didn't match.
  85                  */
  86                 templ = chooser[0].templ;
  87         }
  88         return templ;
  89 }
  90
  91 // MARK: ----- X509 Name, RDN ------
  92
  93 /* AttributeTypeAndValue */
  94
  95 /*
  96  * NSS_ATV Template chooser.
  97  */
  98 static const NSS_TagChoice atvChoices[] = {
  99         { SEC_ASN1_PRINTABLE_STRING, kSecAsn1PrintableStringTemplate} ,
 100         { SEC_ASN1_TELETEX_STRING, kSecAsn1TeletexStringTemplate },
 101         { SEC_ASN1_UNIVERSAL_STRING, kSecAsn1UniversalStringTemplate },
 102         { SEC_ASN1_UTF8_STRING, kSecAsn1UTF8StringTemplate },
 103         { SEC_ASN1_BMP_STRING, kSecAsn1BMPStringTemplate },
 104         { SEC_ASN1_IA5_STRING, kSecAsn1IA5StringTemplate },
 105         { 0, NULL}
 106 };
 107
 108 static const SecAsn1Template * NSS_ATVChooser(
 109         void *arg,
 110         Boolean enc,
 111         const char *buf,
 112         void *dest)
 113 {
 114         return SecAsn1TaggedTemplateChooser(arg, enc, buf, dest, atvChoices);
 115 }
 116
 117 static const SecAsn1TemplateChooserPtr NSS_ATVChooserPtr = NSS_ATVChooser;
 118
 119 const SecAsn1Template kSecAsn1ATVTemplate[] = {
 120     { SEC_ASN1_SEQUENCE,
 121           0, NULL, sizeof(NSS_ATV) },
 122     { SEC_ASN1_OBJECT_ID,
 123           offsetof(NSS_ATV,type), },
 124     { SEC_ASN1_INLINE | SEC_ASN1_DYNAMIC,
 125           offsetof(NSS_ATV,value),
 126           &NSS_ATVChooserPtr },
 127     { 0, }
 128 };
 129
 130 /* RelativeDistinguishedName */
 131 const SecAsn1Template kSecAsn1RDNTemplate[] = {
 132     { SEC_ASN1_SET_OF,
 133           offsetof(NSS_RDN,atvs), kSecAsn1ATVTemplate, sizeof(NSS_RDN) }
 134 };
 135
 136 /* X509 Name */
 137 const SecAsn1Template kSecAsn1NameTemplate[] = {
 138     { SEC_ASN1_SEQUENCE_OF,
 139           offsetof(NSS_Name,rdns), kSecAsn1RDNTemplate, sizeof(NSS_Name) }
 140 };
 141
 142 // MARK: ----- OtherName, GeneralizedName -----
 143
 144 /*
 145  * CE_OtherName.value expressed as ASN_ANY, not en/decoded.
 146  */
 147 const SecAsn1Template NSS_OtherNameTemplate[] = {
 148     { SEC_ASN1_SEQUENCE,
 149           0, NULL, sizeof(CE_OtherName) },
 150     { SEC_ASN1_OBJECT_ID,
 151           offsetof(CE_OtherName,typeId), },
 152     { SEC_ASN1_ANY,
 153           offsetof(CE_OtherName,value), },
 154     { 0, }
 155 };
 156
 157 /*
 158  * For decoding an OtherName when it's a context-specific CHOICE
 159  * of a GeneralName.
 160  */
 161 const SecAsn1Template kSecAsn1GenNameOtherNameTemplate[] = {
 162     { SEC_ASN1_CONTEXT_SPECIFIC | SEC_ASN1_CONSTRUCTED | NGT_OtherName,
 163           0, NSS_OtherNameTemplate, sizeof(CE_OtherName) }
 164 };
 165
 166 /*
 167  * NSS_GeneralName template chooser.
 168  * First, a crufty set of templates specific to this context.
 169  * All offsets are zero (the fundamental type is a NSS_TaggedItem).
 170  *
 171  * NOTE WELL: RFC2459 says that all of the choices within a
 172  * GeneralName (which these templates implement) have implicit
 173  * context-specific tags.
 174  * HOWEVER: RFC2538 and the real world indicate that the directoryName
 175  * choice is EXPLICITLY tagged. This causes an extra layer of DER -
 176  * the "thing" is wrapped in a header consisting of the tag byte
 177  * (SEC_ASN1_CONTEXT_SPECIFIC plus context tag plus SEC_ASN1_CONSTRUCTED)
 178  * and the length field.
 179  *
 180  * To actually implement this in the current pile-of-cruft context,
 181  * the directoryName and otherName choices are processed here with
 182  * NSS_InnerAnyTemplate which strips off the explicit tag layer, leaving
 183  * further processing to the app.
 184  *
 185  * I sure hope we don't find certs that actually conform to RFC2459 on
 186  * this. We might have to handle both. Be forewarned.
 187  */
 188
 189 /* inner contents of an ASN_ANY */
 190
 191 #define NSS_GEN_NAME_OFFSET     (offsetof(NSS_GeneralName,item))
 192 #define NSS_GEN_NAME_SIZE       (sizeof(NSS_GeneralName))
 193
 194 const SecAsn1Template kSecAsn1OtherNameTemplate[] = {
 195     { SEC_ASN1_CONTEXT_SPECIFIC | SEC_ASN1_CONSTRUCTED | NGT_OtherName,
 196       NSS_GEN_NAME_OFFSET, kSecAsn1AnyTemplate, NSS_GEN_NAME_SIZE }
 197 };
 198 const SecAsn1Template kSecAsn1RFC822NameTemplate[] = {
 199     { SEC_ASN1_CONTEXT_SPECIFIC | NGT_RFC822Name,
 200       NSS_GEN_NAME_OFFSET, kSecAsn1IA5StringTemplate, NSS_GEN_NAME_SIZE }
 201 };
 202 const SecAsn1Template kSecAsn1DNSNameTemplate[] = {
 203     { SEC_ASN1_CONTEXT_SPECIFIC | NGT_DNSName,
 204       NSS_GEN_NAME_OFFSET, kSecAsn1IA5StringTemplate, NSS_GEN_NAME_SIZE }
 205 };
 206 const SecAsn1Template kSecAsn1X400AddressTemplate[] = {
 207     { SEC_ASN1_CONTEXT_SPECIFIC |  SEC_ASN1_CONSTRUCTED | NGT_X400Address,
 208       NSS_GEN_NAME_OFFSET, kSecAsn1AnyTemplate, NSS_GEN_NAME_SIZE }
 209 };
 210 const SecAsn1Template kSecAsn1DirectoryNameTemplate[] = {
 211     { SEC_ASN1_CONTEXT_SPECIFIC | SEC_ASN1_CONSTRUCTED |
 212           SEC_ASN1_EXPLICIT | NGT_DirectoryName,
 213       NSS_GEN_NAME_OFFSET, kSecAsn1AnyTemplate, NSS_GEN_NAME_SIZE }
 214         };
 215 const SecAsn1Template kSecAsn1EdiPartyNameTemplate[] = {
 216     { SEC_ASN1_CONTEXT_SPECIFIC |  SEC_ASN1_CONSTRUCTED | NGT_EdiPartyName,
 217       NSS_GEN_NAME_OFFSET, kSecAsn1AnyTemplate, NSS_GEN_NAME_SIZE }
 218 };
 219 const SecAsn1Template kSecAsn1URITemplate[] = {
 220     { SEC_ASN1_CONTEXT_SPECIFIC | NGT_URI,
 221       NSS_GEN_NAME_OFFSET, kSecAsn1IA5StringTemplate, NSS_GEN_NAME_SIZE }
 222 };
 223 const SecAsn1Template kSecAsn1IPAddressTemplate[] = {
 224     { SEC_ASN1_CONTEXT_SPECIFIC | NGT_IPAddress,
 225       NSS_GEN_NAME_OFFSET, kSecAsn1OctetStringTemplate, NSS_GEN_NAME_SIZE }
 226 };
 227 const SecAsn1Template kSecAsn1RegisteredIDTemplate[] = {
 228     { SEC_ASN1_CONTEXT_SPECIFIC | NGT_RegisteredID,
 229       NSS_GEN_NAME_OFFSET, kSecAsn1ObjectIDTemplate, NSS_GEN_NAME_SIZE }
 230 };
 231
 232 static const NSS_TagChoice genNameChoices[] = {
 233         { NGT_OtherName, kSecAsn1OtherNameTemplate} ,
 234         { NGT_RFC822Name, kSecAsn1RFC822NameTemplate },
 235         { NGT_DNSName, kSecAsn1DNSNameTemplate },
 236         { NGT_X400Address, kSecAsn1X400AddressTemplate },
 237         { NGT_DirectoryName, kSecAsn1DirectoryNameTemplate },
 238         { NGT_EdiPartyName, kSecAsn1EdiPartyNameTemplate },
 239         { NGT_URI, kSecAsn1URITemplate },
 240         { NGT_IPAddress, kSecAsn1IPAddressTemplate },
 241         { NGT_RegisteredID, kSecAsn1RegisteredIDTemplate },
 242         { 0, NULL}
 243 };
 244
 245 static const SecAsn1Template * NSS_genNameChooser(
 246         void *arg,
 247         Boolean enc,
 248         const char *buf,
 249         void *dest)
 250 {
 251         return SecAsn1TaggedTemplateChooser(arg, enc, buf, dest, genNameChoices);
 252 }
 253
 254 static const SecAsn1TemplateChooserPtr NSS_genNameChooserPtr =
 255         NSS_genNameChooser;
 256
 257 const SecAsn1Template kSecAsn1GeneralNameTemplate[] = {
 258     { SEC_ASN1_DYNAMIC | SEC_ASN1_CONTEXT_SPECIFIC,
 259           offsetof(NSS_GeneralName,item),               // Needed?
 260           &NSS_genNameChooserPtr },
 261     { 0, }                                                                      // Needed?
 262 };