OSX/libsecurity_codesigning/lib/reqdumper.cpp

   1 /*
   2  * Copyright (c) 2006-2007,2011-2013 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
  24 //
  25 // reqdumper - Requirement un-parsing (disassembly)
  26 //
  27 #include "reqdumper.h"
  28 #if TARGET_OS_OSX
  29 #include <security_cdsa_utilities/cssmdata.h>   // OID encoder
  30 #endif
  31 #include <cstdarg>
  32
  33 namespace Security {
  34 namespace CodeSigning {
  35
  36 using namespace UnixPlusPlus;
  37
  38
  39 //
  40 // Table of reserved words (keywords), generated by ANTLR
  41 //
  42 static const char * const keywords[] = {
  43 #include "RequirementKeywords.h"
  44         "",
  45         NULL
  46 };
  47
  48
  49 //
  50 // Printf to established output channel
  51 //
  52 void Dumper::print(const char *format, ...)
  53 {
  54         char buffer[256];
  55         va_list args;
  56         va_start(args, format);
  57         vsnprintf(buffer, sizeof(buffer), format, args);
  58         va_end(args);
  59         mOutput += buffer;
  60 }
  61
  62
  63 //
  64 // Dump the underlying Requirement program
  65 //
  66 void Dumper::dump()
  67 {
  68         this->expr();
  69
  70         // remove any initial space
  71         if (mOutput[0] == ' ')
  72                 mOutput = mOutput.substr(1);
  73 }
  74
  75
  76 //
  77 // Dump an entire Requirements set, using temporary Dumper objects.
  78 //
  79 // This detects single Requirement inputs and dumps them successfully (using
  80 // single-requirement syntax). No indication of error is returned in this case.
  81 //
  82 string Dumper::dump(const Requirements *reqs, bool debug /* = false */)
  83 {
  84         if (!reqs) {
  85                 return "# no requirement(s)";
  86         } else if (reqs->magic() == Requirement::typeMagic) {   // single requirement
  87                 return dump((const Requirement *)reqs) + "\n";
  88         } else {
  89                 string result;
  90                 for (unsigned n = 0; n < reqs->count(); n++) {
  91                         char prefix[200];
  92                         if (reqs->type(n) < kSecRequirementTypeCount)
  93                                 snprintf(prefix, sizeof(prefix),
  94                                         "%s => ", Requirement::typeNames[reqs->type(n)]);
  95                         else
  96                                 snprintf(prefix, sizeof(prefix), "/*unknown type*/ %d => ", reqs->type(n));
  97                         Dumper dumper(reqs->blob<Requirement>(n), debug);
  98                         dumper.expr();
  99                         result += prefix + dumper.value() + "\n";
 100                 }
 101                 return result;
 102         }
 103 }
 104
 105 string Dumper::dump(const Requirement *req, bool debug /* = false */)
 106 {
 107         Dumper dumper(req, debug);
 108         try {
 109                 dumper.dump();
 110                 return dumper;
 111         } catch (const CommonError &err) {
 112                 if (debug) {
 113                         char errstr[80];
 114                         snprintf(errstr, sizeof(errstr), " !! error %ld !!", (unsigned long)err.osStatus());
 115                         return dumper.value() + errstr;
 116                 }
 117                 throw;
 118         }
 119 }
 120
 121 string Dumper::dump(const BlobCore *req, bool debug /* = false */)
 122 {
 123         switch (req->magic()) {
 124         case Requirement::typeMagic:
 125                 return dump(static_cast<const Requirement *>(req), debug);
 126         case Requirements::typeMagic:
 127                 return dump(static_cast<const Requirements *>(req), debug);
 128         default:
 129                 return "invalid data type";
 130         }
 131 }
 132
 133
 134 //
 135 // Element dumpers. Output accumulates in internal buffer.
 136 //
 137 void Dumper::expr(SyntaxLevel level)
 138 {
 139         if (mDebug)
 140                 print("/*@0x%x*/", pc());
 141         ExprOp op = ExprOp(get<uint32_t>());
 142         switch (op & ~opFlagMask) {
 143         case opFalse:
 144                 print("never");
 145                 break;
 146         case opTrue:
 147                 print("always");
 148                 break;
 149         case opIdent:
 150                 print("identifier ");
 151                 data();
 152                 break;
 153         case opAppleAnchor:
 154                 print("anchor apple");
 155                 break;
 156         case opAppleGenericAnchor:
 157                 print("anchor apple generic");
 158                 break;
 159         case opAnchorHash:
 160                 print("certificate"); certSlot(); print(" = "); hashData();
 161                 break;
 162         case opInfoKeyValue:
 163                 if (mDebug)
 164                         print("/*legacy*/");
 165                 print("info["); dotString(); print("] = "); data();
 166                 break;
 167         case opAnd:
 168                 if (level < slAnd)
 169                         print("(");
 170                 expr(slAnd);
 171                 print(" and ");
 172                 expr(slAnd);
 173                 if (level < slAnd)
 174                         print(")");
 175                 break;
 176         case opOr:
 177                 if (level < slOr)
 178                         print("(");
 179                 expr(slOr);
 180                 print(" or ");
 181                 expr(slOr);
 182                 if (level < slOr)
 183                         print(")");
 184                 break;
 185         case opNot:
 186                 print("! ");
 187                 expr(slPrimary);
 188                 break;
 189         case opCDHash:
 190                 print("cdhash ");
 191                 hashData();
 192                 break;
 193         case opInfoKeyField:
 194                 print("info["); dotString(); print("]"); match();
 195                 break;
 196         case opEntitlementField:
 197                 print("entitlement["); dotString(); print("]"); match();
 198                 break;
 199         case opCertField:
 200                 print("certificate"); certSlot(); print("["); dotString(); print("]"); match();
 201                 break;
 202         case opCertFieldDate:
 203                 print("certificate"); certSlot(); print("[");
 204 #if TARGET_OS_OSX
 205                 {
 206                         const unsigned char *data; size_t length;
 207                         getData(data, length);
 208                         print("timestamp.%s", CssmOid((unsigned char *)data, length).toOid().c_str());
 209                 }
 210 #endif
 211         case opCertGeneric:
 212                 print("certificate"); certSlot(); print("[");
 213 #if TARGET_OS_OSX
 214                 {
 215                         const unsigned char *data; size_t length;
 216                         getData(data, length);
 217                         print("field.%s", CssmOid((unsigned char *)data, length).toOid().c_str());
 218                 }
 219 #endif
 220                 print("]"); match();
 221                 break;
 222         case opCertPolicy:
 223                 print("certificate"); certSlot(); print("[");
 224 #if TARGET_OS_OSX
 225                 {
 226                         const unsigned char *data; size_t length;
 227                         getData(data, length);
 228                         print("policy.%s", CssmOid((unsigned char *)data, length).toOid().c_str());
 229                 }
 230 #endif
 231                 print("]"); match();
 232                 break;
 233         case opTrustedCert:
 234                 print("certificate"); certSlot(); print("trusted");
 235                 break;
 236         case opTrustedCerts:
 237                 print("anchor trusted");
 238                 break;
 239         case opNamedAnchor:
 240                 print("anchor apple "); data();
 241                 break;
 242         case opNamedCode:
 243                 print("("); data(); print(")");
 244                 break;
 245         case opPlatform:
 246                 print("platform = %d", get<int32_t>());
 247                 break;
 248         case opNotarized:
 249                 print("notarized");
 250                 break;
 251         default:
 252                 if (op & opGenericFalse) {
 253                         print(" false /* opcode %d */", op & ~opFlagMask);
 254                         break;
 255                 } else if (op & opGenericSkip) {
 256                         print(" /* opcode %d */", op & ~opFlagMask);
 257                         break;
 258                 } else {
 259                         print("OPCODE %d NOT UNDERSTOOD (ending print)", op);
 260                         return;
 261                 }
 262         }
 263 }
 264
 265 void Dumper::certSlot()
 266 {
 267         switch (int32_t slot = get<int32_t>()) {
 268         case Requirement::anchorCert:
 269                 print(" root");
 270                 break;
 271         case Requirement::leafCert:
 272                 print(" leaf");
 273                 break;
 274         default:
 275                 print(" %d", slot);
 276                 break;
 277         }
 278 }
 279
 280 void Dumper::match()
 281 {
 282         switch (MatchOperation op = MatchOperation(get<uint32_t>())) {
 283         case matchExists:
 284                 print(" /* exists */");
 285                 break;
 286         case matchAbsent:
 287                 print(" absent ");
 288                 break;
 289         case matchEqual:
 290                 print(" = "); data();
 291                 break;
 292         case matchContains:
 293                 print(" ~ "); data();
 294                 break;
 295         case matchBeginsWith:
 296                 print(" = "); data(); print("*");
 297                 break;
 298         case matchEndsWith:
 299                 print(" = *"); data();
 300                 break;
 301         case matchLessThan:
 302                 print(" < "); data();
 303                 break;
 304         case matchGreaterEqual:
 305                 print(" >= "); data();
 306                 break;
 307         case matchLessEqual:
 308                 print(" <= "); data();
 309                 break;
 310         case matchGreaterThan:
 311                 print(" > "); data();
 312                 break;
 313         case matchOn:
 314                 print(" = "); timestamp();
 315                 break;
 316         case matchBefore:
 317                 print(" < "); timestamp();
 318                 break;
 319         case matchAfter:
 320                 print(" > "); timestamp();
 321                 break;
 322         case matchOnOrBefore:
 323                 print(" <= "); timestamp();
 324                 break;
 325         case matchOnOrAfter:
 326                 print(" >= "); timestamp();
 327                 break;
 328         default:
 329                 print("MATCH OPCODE %d NOT UNDERSTOOD", op);
 330                 break;
 331         }
 332 }
 333
 334 void Dumper::hashData()
 335 {
 336         print("H\"");
 337         const unsigned char *data; size_t length;
 338         getData(data, length);
 339         printBytes(data, length);
 340         print("\"");
 341 }
 342
 343 void Dumper::data(PrintMode bestMode /* = isSimple */, bool dotOkay /* = false */)
 344 {
 345         const unsigned char *data; size_t length;
 346         getData(data, length);
 347         for (unsigned n = 0; n < length; n++)
 348                 if ((isalnum(data[n]) || (data[n] == '.' && dotOkay))) {        // simple
 349                         if (n == 0 && isdigit(data[n])) // unquoted idents can't start with a digit
 350                                 bestMode = isPrintable;
 351                 } else if (isgraph(data[n]) || isspace(data[n])) {
 352                         if (bestMode == isSimple)
 353                                 bestMode = isPrintable;
 354                 } else {
 355                         bestMode = isBinary;
 356                         break;          // pessimal
 357                 }
 358
 359         if (bestMode == isSimple) {
 360                 string s((const char *)data, length);
 361                 for (const char * const * k = keywords; *k; k++)
 362                         if (s == *k) {
 363                                 bestMode = isPrintable;         // reserved word; need quotes
 364                                 break;
 365                         }
 366         }
 367
 368         switch (bestMode) {
 369         case isSimple:
 370                 print("%.*s", (int)length, data);
 371                 break;
 372         case isPrintable:
 373                 print("\"");
 374                 for (unsigned n = 0; n < length; n++)
 375                         switch (data[n]) {
 376                         case '\\':
 377                         case '"':
 378                                 print("\\%c", data[n]);
 379                                 break;
 380                         default:
 381                                 print("%c", data[n]);
 382                                 break;
 383                         }
 384                 print("\"");
 385                 break;
 386         default:
 387                 print("0x");
 388                 printBytes(data, length);
 389                 break;
 390         }
 391 }
 392
 393 void Dumper::timestamp()
 394 {
 395         CFAbsoluteTime at = static_cast<CFAbsoluteTime>(get<int64_t>());
 396         CFRef<CFDateRef> date = CFDateCreate(NULL, at);
 397
 398         CFRef<CFStringRef> str = CFCopyDescription(date);
 399
 400         print("<%s>", cfString(str).c_str());
 401 }
 402
 403 void Dumper::printBytes(const Byte *data, size_t length)
 404 {
 405         for (unsigned n = 0; n < length; n++)
 406                 print("%02.2x", data[n]);
 407 }
 408
 409
 410 }       // CodeSigning
 411 }       // Security