libsecurity_codesigning/lib/reqdumper.cpp

   1 /*
   2  * Copyright (c) 2006-2007 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 #include <security_cdsa_utilities/cssmdata.h>   // OID encoder
  29 #include <cstdarg>
  30
  31 namespace Security {
  32 namespace CodeSigning {
  33
  34 using namespace UnixPlusPlus;
  35
  36
  37 //
  38 // Table of reserved words (keywords), generated by ANTLR
  39 //
  40 static const char * const keywords[] = {
  41 #include "RequirementKeywords.h"
  42         "",
  43         NULL
  44 };
  45
  46
  47 //
  48 // Printf to established output channel
  49 //
  50 void Dumper::print(const char *format, ...)
  51 {
  52         char buffer[256];
  53         va_list args;
  54         va_start(args, format);
  55         vsnprintf(buffer, sizeof(buffer), format, args);
  56         va_end(args);
  57         mOutput += buffer;
  58 }
  59
  60
  61 //
  62 // Dump the underlying Requirement program
  63 //
  64 void Dumper::dump()
  65 {
  66         this->expr();
  67
  68         // remove any initial space
  69         if (mOutput[0] == ' ')
  70                 mOutput = mOutput.substr(1);
  71 }
  72
  73
  74 //
  75 // Dump an entire Requirements set, using temporary Dumper objects.
  76 //
  77 // This detects single Requirement inputs and dumps them successfully (using
  78 // single-requirement syntax). No indication of error is returned in this case.
  79 //
  80 string Dumper::dump(const Requirements *reqs, bool debug /* = false */)
  81 {
  82         if (!reqs) {
  83                 return "# no requirement(s)";
  84         } else if (reqs->magic() == Requirement::typeMagic) {   // single requirement
  85                 return dump((const Requirement *)reqs) + "\n";
  86         } else {
  87                 string result;
  88                 for (unsigned n = 0; n < reqs->count(); n++) {
  89                         char prefix[200];
  90                         if (reqs->type(n) < kSecRequirementTypeCount)
  91                                 snprintf(prefix, sizeof(prefix),
  92                                         "%s => ", Requirement::typeNames[reqs->type(n)]);
  93                         else
  94                                 snprintf(prefix, sizeof(prefix), "/*unknown type*/ %d => ", reqs->type(n));
  95                         Dumper dumper(reqs->blob<Requirement>(n), debug);
  96                         dumper.expr();
  97                         result += prefix + dumper.value() + "\n";
  98                 }
  99                 return result;
 100         }
 101 }
 102
 103 string Dumper::dump(const Requirement *req, bool debug /* = false */)
 104 {
 105         Dumper dumper(req, debug);
 106         try {
 107                 dumper.dump();
 108                 return dumper;
 109         } catch (const CommonError &err) {
 110                 if (debug) {
 111                         char errstr[80];
 112                         snprintf(errstr, sizeof(errstr), " !! error %ld !!", (unsigned long)err.osStatus());
 113                         return dumper.value() + errstr;
 114                 }
 115                 throw;
 116         }
 117 }
 118
 119 string Dumper::dump(const BlobCore *req, bool debug /* = false */)
 120 {
 121         switch (req->magic()) {
 122         case Requirement::typeMagic:
 123                 return dump(static_cast<const Requirement *>(req), debug);
 124                 break;
 125         case Requirements::typeMagic:
 126                 return dump(static_cast<const Requirements *>(req), debug);
 127                 break;
 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 opCertGeneric:
 203                 print("certificate"); certSlot(); print("[");
 204                 {
 205                         const unsigned char *data; size_t length;
 206                         getData(data, length);
 207                         print("field.%s", CssmOid((unsigned char *)data, length).toOid().c_str());
 208                 }
 209                 print("]"); match();
 210                 break;
 211         case opCertPolicy:
 212                 print("certificate"); certSlot(); print("[");
 213                 {
 214                         const unsigned char *data; size_t length;
 215                         getData(data, length);
 216                         print("policy.%s", CssmOid((unsigned char *)data, length).toOid().c_str());
 217                 }
 218                 print("]"); match();
 219                 break;
 220         case opTrustedCert:
 221                 print("certificate"); certSlot(); print("trusted");
 222                 break;
 223         case opTrustedCerts:
 224                 print("anchor trusted");
 225                 break;
 226         case opNamedAnchor:
 227                 print("anchor apple "); data();
 228                 break;
 229         case opNamedCode:
 230                 print("("); data(); print(")");
 231                 break;
 232         default:
 233                 if (op & opGenericFalse) {
 234                         print(" false /* opcode %d */", op & ~opFlagMask);
 235                         break;
 236                 } else if (op & opGenericSkip) {
 237                         print(" /* opcode %d */", op & ~opFlagMask);
 238                         break;
 239                 } else {
 240                         print("OPCODE %d NOT UNDERSTOOD (ending print)", op);
 241                         return;
 242                 }
 243         }
 244 }
 245
 246 void Dumper::certSlot()
 247 {
 248         switch (int32_t slot = get<int32_t>()) {
 249         case Requirement::anchorCert:
 250                 print(" root");
 251                 break;
 252         case Requirement::leafCert:
 253                 print(" leaf");
 254                 break;
 255         default:
 256                 print(" %d", slot);
 257                 break;
 258         }
 259 }
 260
 261 void Dumper::match()
 262 {
 263         switch (MatchOperation op = MatchOperation(get<uint32_t>())) {
 264         case matchExists:
 265                 print(" /* exists */");
 266                 break;
 267         case matchEqual:
 268                 print(" = "); data();
 269                 break;
 270         case matchContains:
 271                 print(" ~ "); data();
 272                 break;
 273         case matchBeginsWith:
 274                 print(" = "); data(); print("*");
 275                 break;
 276         case matchEndsWith:
 277                 print(" = *"); data();
 278                 break;
 279         case matchLessThan:
 280                 print(" < "); data();
 281                 break;
 282         case matchGreaterEqual:
 283                 print(" >= "); data();
 284                 break;
 285         case matchLessEqual:
 286                 print(" <= "); data();
 287                 break;
 288         case matchGreaterThan:
 289                 print(" > "); data();
 290                 break;
 291         default:
 292                 print("MATCH OPCODE %d NOT UNDERSTOOD", op);
 293                 break;
 294         }
 295 }
 296
 297 void Dumper::hashData()
 298 {
 299         print("H\"");
 300         const unsigned char *data; size_t length;
 301         getData(data, length);
 302         printBytes(data, length);
 303         print("\"");
 304 }
 305
 306 void Dumper::data(PrintMode bestMode /* = isSimple */, bool dotOkay /* = false */)
 307 {
 308         const unsigned char *data; size_t length;
 309         getData(data, length);
 310         for (unsigned n = 0; n < length; n++)
 311                 if ((isalnum(data[n]) || (data[n] == '.' && dotOkay))) {        // simple
 312                         if (n == 0 && isdigit(data[n])) // unquoted idents can't start with a digit
 313                                 bestMode = isPrintable;
 314                 } else if (isgraph(data[n]) || isspace(data[n])) {
 315                         if (bestMode == isSimple)
 316                                 bestMode = isPrintable;
 317                 } else {
 318                         bestMode = isBinary;
 319                         break;          // pessimal
 320                 }
 321
 322         if (bestMode == isSimple) {
 323                 string s((const char *)data, length);
 324                 for (const char * const * k = keywords; *k; k++)
 325                         if (s == *k) {
 326                                 bestMode = isPrintable;         // reserved word; need quotes
 327                                 break;
 328                         }
 329         }
 330
 331         switch (bestMode) {
 332         case isSimple:
 333                 print("%.*s", length, data);
 334                 break;
 335         case isPrintable:
 336                 print("\"%.*s\"", length, data);
 337                 break;
 338         default:
 339                 print("0x");
 340                 printBytes(data, length);
 341                 break;
 342         }
 343 }
 344
 345 void Dumper::printBytes(const Byte *data, size_t length)
 346 {
 347         for (unsigned n = 0; n < length; n++)
 348                 print("%02.2x", data[n]);
 349 }
 350
 351
 352 }       // CodeSigning
 353 }       // Security