libsecurity_sd_cspdl/lib/SDContext.cpp

   1 /*
   2  * Copyright (c) 2004 Apple Computer, 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 //
  26 // SDContext - cryptographic contexts for the security server
  27 //
  28 #include "SDContext.h"
  29
  30 #include "SDCSPSession.h"
  31 #include "SDKey.h"
  32 #include <security_utilities/debugging.h>
  33
  34 #define ssCryptDebug(args...)  secdebug("ssCrypt", ## args)
  35
  36 using namespace SecurityServer;
  37
  38 //
  39 // SDContext
  40 //
  41 SDContext::SDContext(SDCSPSession &session)
  42 : mSession(session), mContext(NULL)
  43 {
  44 }
  45
  46 void SDContext::clearOutBuf()
  47 {
  48         if(mOutBuf.Data) {
  49                 mSession.free(mOutBuf.Data);
  50                 mOutBuf.clear();
  51         }
  52 }
  53
  54 void SDContext::copyOutBuf(CssmData &out)
  55 {
  56         if(out.length() < mOutBuf.length()) {
  57                 CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
  58         }
  59         memmove(out.Data, mOutBuf.Data, mOutBuf.Length);
  60         out.Length = mOutBuf.Length;
  61         clearOutBuf();
  62 }
  63
  64 void
  65 SDContext::init(const Context &context,
  66                                 bool /* encoding */) // @@@ should be removed from API since it's already in mDirection
  67 {
  68         mContext = &context;
  69         clearOutBuf();
  70 }
  71
  72 SecurityServer::ClientSession &
  73 SDContext::clientSession()
  74 {
  75         return mSession.clientSession();
  76 }
  77
  78
  79 //
  80 // SDRandomContext -- Context for GenerateRandom operations
  81 //
  82 SDRandomContext::SDRandomContext(SDCSPSession &session) : SDContext(session) {}
  83
  84 void
  85 SDRandomContext::init(const Context &context, bool encoding)
  86 {
  87         SDContext::init(context, encoding);
  88
  89         // set/freeze output size
  90         mOutSize = context.getInt(CSSM_ATTRIBUTE_OUTPUT_SIZE, CSSMERR_CSP_MISSING_ATTR_OUTPUT_SIZE);
  91
  92 #if 0
  93         // seed the PRNG (if specified)
  94         if (const CssmCryptoData *seed = context.get<CssmCryptoData>(CSSM_ATTRIBUTE_SEED)) {
  95                 const CssmData &seedValue = (*seed)();
  96                 clientSession().seedRandom(seedValue);
  97         }
  98 #endif
  99 }
 100
 101 size_t
 102 SDRandomContext::outputSize(bool final, size_t inSize)
 103 {
 104         return mOutSize;
 105 }
 106
 107 void
 108 SDRandomContext::final(CssmData &out)
 109 {
 110         clientSession().generateRandom(*mContext, out);
 111 }
 112
 113
 114 // signature contexts
 115 SDSignatureContext::SDSignatureContext(SDCSPSession &session)
 116         : SDContext(session),
 117                 mKeyHandle(noKey),
 118                 mNullDigest(NULL),
 119                 mDigest(NULL)
 120 {
 121         /* nothing else for now */
 122 }
 123
 124 SDSignatureContext::~SDSignatureContext()
 125 {
 126         delete mNullDigest;
 127         delete mDigest;
 128 }
 129
 130 void SDSignatureContext::init(const Context &context, bool signing)
 131 {
 132         SDContext::init(context, signing);
 133
 134         /* reusable: skip everything except resetting digest state */
 135         if((mNullDigest != NULL) || (mDigest != NULL)) {
 136                 if(mNullDigest != NULL) {
 137                         mNullDigest->digestInit();
 138                 }
 139                 return;
 140         }
 141
 142         /* snag key from context */
 143         const CssmKey &keyInContext =
 144                 context.get<const CssmKey>(CSSM_ATTRIBUTE_KEY,
 145                                                                    CSSMERR_CSP_MISSING_ATTR_KEY);
 146         mKeyHandle = mSession.lookupKey(keyInContext).keyHandle();
 147
 148         /* get digest alg and sig alg from Context.algorithm */
 149         switch(context.algorithm()) {
 150                 /*** DSA ***/
 151                 case CSSM_ALGID_SHA1WithDSA:
 152                         mDigestAlg = CSSM_ALGID_SHA1;
 153                         mSigAlg = CSSM_ALGID_DSA;
 154                         break;
 155                 case CSSM_ALGID_DSA:                            // Raw
 156                         mDigestAlg = CSSM_ALGID_NONE;
 157                         mSigAlg = CSSM_ALGID_DSA;
 158                         break;
 159                 /*** RSA ***/
 160                 case CSSM_ALGID_SHA1WithRSA:
 161                         mDigestAlg = CSSM_ALGID_SHA1;
 162                         mSigAlg = CSSM_ALGID_RSA;
 163                         break;
 164                 case CSSM_ALGID_MD5WithRSA:
 165                         mDigestAlg = CSSM_ALGID_MD5;
 166                         mSigAlg = CSSM_ALGID_RSA;
 167                         break;
 168                 case CSSM_ALGID_MD2WithRSA:
 169                         mDigestAlg = CSSM_ALGID_MD2;
 170                         mSigAlg = CSSM_ALGID_RSA;
 171                         break;
 172                 case CSSM_ALGID_RSA:                            // Raw
 173                         mDigestAlg = CSSM_ALGID_NONE;
 174                         mSigAlg = CSSM_ALGID_RSA;
 175                         break;
 176                 /*** FEE ***/
 177                 case CSSM_ALGID_FEE_SHA1:
 178                         mDigestAlg = CSSM_ALGID_SHA1;
 179                         mSigAlg = CSSM_ALGID_FEE;
 180                         break;
 181                 case CSSM_ALGID_FEE_MD5:
 182                         mDigestAlg = CSSM_ALGID_MD5;
 183                         mSigAlg = CSSM_ALGID_FEE;
 184                         break;
 185                 case CSSM_ALGID_FEE:                            // Raw
 186                         mDigestAlg = CSSM_ALGID_NONE;
 187                         mSigAlg = CSSM_ALGID_FEE;
 188                         break;
 189                 /*** ECDSA ***/
 190                 case CSSM_ALGID_SHA1WithECDSA:
 191                         mDigestAlg = CSSM_ALGID_SHA1;
 192                         mSigAlg = CSSM_ALGID_ECDSA;
 193                         break;
 194                 case CSSM_ALGID_SHA224WithECDSA:
 195                         mDigestAlg = CSSM_ALGID_SHA224;
 196                         mSigAlg = CSSM_ALGID_ECDSA;
 197                         break;
 198                 case CSSM_ALGID_SHA256WithECDSA:
 199                         mDigestAlg = CSSM_ALGID_SHA256;
 200                         mSigAlg = CSSM_ALGID_ECDSA;
 201                         break;
 202                 case CSSM_ALGID_SHA384WithECDSA:
 203                         mDigestAlg = CSSM_ALGID_SHA384;
 204                         mSigAlg = CSSM_ALGID_ECDSA;
 205                         break;
 206                 case CSSM_ALGID_SHA512WithECDSA:
 207                         mDigestAlg = CSSM_ALGID_SHA512;
 208                         mSigAlg = CSSM_ALGID_ECDSA;
 209                         break;
 210                 case CSSM_ALGID_ECDSA:                          // Raw
 211                         mDigestAlg = CSSM_ALGID_NONE;
 212                         mSigAlg = CSSM_ALGID_ECDSA;
 213                         break;
 214                 default:
 215                         CssmError::throwMe(CSSMERR_CSP_INVALID_ALGORITHM);
 216         }
 217
 218         /* set up mNullDigest or mDigest */
 219         if(mDigestAlg == CSSM_ALGID_NONE) {
 220                 mNullDigest = new NullDigest();
 221         }
 222         else {
 223                 mDigest = new CssmClient::Digest(mSession.mRawCsp, mDigestAlg);
 224         }
 225 }
 226
 227 /*
 228  * for raw sign/verify - optionally called after init.
 229  * Note that in init (in this case), we set mDigestAlg to ALGID_NONE and set up
 230  * a NullDigest. We now overwrite mDigestAlg, and we'll useÊthis
 231  * new value when we do the actual sign/vfy.
 232  */
 233 void SDSignatureContext::setDigestAlgorithm(CSSM_ALGORITHMS digestAlg)
 234 {
 235         mDigestAlg = digestAlg;
 236 }
 237
 238 void SDSignatureContext::update(const CssmData &data)
 239 {
 240         /* Note that for this context, we really can not deal with an out-of-sequence
 241          * update --> final(true, 0) --> update since we lose the pending digest state
 242          * when we perform the implied final() during outputSize(true, 0). */
 243         assert(mOutBuf.Data == NULL);
 244
 245         /* add incoming data to digest or accumulator */
 246         if(mNullDigest) {
 247                 mNullDigest->digestUpdate(data.data(), data.length());
 248         }
 249         else {
 250                 mDigest->digest(data);
 251         }
 252 }
 253
 254 size_t SDSignatureContext::outputSize(bool final, size_t inSize)
 255 {
 256         if(!final) {
 257                 ssCryptDebug("===sig outputSize !final\n");
 258                 return 0;
 259         }
 260         if(!encoding()) {
 261                 ssCryptDebug("===sig outputSize final, !encoding\n");
 262                 /* don't see why this is even called... */
 263                 return 0;
 264         }
 265         if(inSize == 0) {
 266                 /*
 267                  * This is the implied signal to go for it. Note that in this case,
 268                  * we can not go back and re-do the op in case of an unexpected
 269                  * sequence of update/outputSize(final, 0)/final - we lose the digest
 270                  * state. Perhaps we should save the digest...? But still it would
 271                  * be impossible to do another update.
 272                  */
 273                 clearOutBuf();
 274                 sign(mOutBuf);
 275                 ssCryptDebug("===sig outputSize(pre-op) %u", (unsigned)mOutBuf.Length);
 276                 return (size_t)mOutBuf.Length;
 277         }
 278         else {
 279                 /* out-of-band case, ask CSP via SS */
 280                 uint32 outSize = clientSession().getOutputSize(*mContext,
 281                         mKeyHandle,
 282                         /* FIXME - what to use for inSize here - we don't want to
 283                          * interrogate mDigest, as that would result in another RPC...
 284                          * and signature size is not related to input size...right? */
 285                         inSize,
 286                         true);
 287                 ssCryptDebug("===sig outputSize(RPC) %u", (unsigned)outSize);
 288                 return (size_t)outSize;
 289         }
 290 }
 291
 292 /* sign */
 293
 294 /* first the common routine shared by final and outputSize */
 295 void SDSignatureContext::sign(CssmData &sig)
 296 {
 297         /* we have to pass down a modified Context, thus.... */
 298         Context tempContext = *mContext;
 299         tempContext.AlgorithmType = mSigAlg;
 300
 301         if(mNullDigest) {
 302                 CssmData dData(const_cast<void *>(mNullDigest->digestPtr()),
 303                         mNullDigest->digestSizeInBytes());
 304                 clientSession().generateSignature(tempContext,
 305                         mKeyHandle,
 306                         dData,
 307                         sig,
 308                         mDigestAlg);
 309         }
 310         else {
 311                 CssmAutoData d (mDigest->allocator ());
 312                         d.set((*mDigest) ());
 313
 314                         clientSession().generateSignature(tempContext,
 315                                 mKeyHandle,
 316                                 d,
 317                                 sig,
 318                                 mDigestAlg);
 319         }
 320 }
 321
 322 /* this is the one called by CSPFullPluginSession */
 323 void SDSignatureContext::final(CssmData &sig)
 324 {
 325         if(mOutBuf.Data) {
 326                 /* normal final case in which the actual RPC via SS was done in the
 327                  * previous outputSize() call. */
 328                 ssCryptDebug("===final via pre-op and copy");
 329                 copyOutBuf(sig);
 330                 return;
 331         }
 332
 333         ssCryptDebug("===final via RPC");
 334         sign(sig);
 335 }
 336
 337 /* verify */
 338 void
 339 SDSignatureContext::final(const CssmData &sig)
 340 {
 341         /* we have to pass down a modified Context, thus.... */
 342         Context tempContext = *mContext;
 343         tempContext.AlgorithmType = mSigAlg;
 344
 345         if(mNullDigest) {
 346                 CssmData dData(const_cast<void *>(mNullDigest->digestPtr()),
 347                         mNullDigest->digestSizeInBytes());
 348                 clientSession().verifySignature(tempContext,
 349                         mKeyHandle,
 350                         dData,
 351                         sig,
 352                         mDigestAlg);
 353         }
 354         else {
 355                 clientSession().verifySignature(tempContext,
 356                         mKeyHandle,
 357                         (*mDigest)(),
 358                         sig,
 359                         mDigestAlg);
 360         }
 361 }
 362
 363
 364 //
 365 // SDCryptContext -- Context for Encrypt and Decrypt operations
 366 //
 367 SDCryptContext::SDCryptContext(SDCSPSession &session)
 368         : SDContext(session), mKeyHandle(noKey)
 369 {
 370         /* nothing for now */
 371 }
 372
 373
 374 SDCryptContext::~SDCryptContext()
 375 {
 376         /* nothing for now */
 377 }
 378
 379 void
 380 SDCryptContext::init(const Context &context, bool encoding)
 381 {
 382         ssCryptDebug("===init");
 383         SDContext::init(context, encoding);
 384
 385         /* reusable; reset accumulator */
 386         mNullDigest.digestInit();
 387
 388         const CssmKey &keyInContext =
 389                 context.get<const CssmKey>(CSSM_ATTRIBUTE_KEY,
 390                                                                    CSSMERR_CSP_MISSING_ATTR_KEY);
 391         mKeyHandle = mSession.lookupKey(keyInContext).keyHandle();
 392 }
 393
 394 size_t
 395 SDCryptContext::inputSize(size_t outSize)
 396 {
 397         ssCryptDebug("===inputSize  outSize=%u", (unsigned)outSize);
 398         return UINT_MAX;
 399 }
 400
 401 size_t
 402 SDCryptContext::outputSize(bool final, size_t inSize)
 403 {
 404         ssCryptDebug("===outputSize final %d inSize=%u", final, (unsigned)inSize);
 405         if(!final) {
 406                 /* we buffer until final; no intermediate output */
 407                 return 0;
 408         }
 409         size_t inBufSize = mNullDigest.digestSizeInBytes();
 410         if(inSize == 0) {
 411                 /* This is the implied signal to go for it */
 412                 clearOutBuf();
 413                 if(inBufSize == 0) {
 414                         return 0;
 415                 }
 416                 const CssmData in(const_cast<void *>(mNullDigest.digestPtr()), inBufSize);
 417                 if (encoding()) {
 418                         clientSession().encrypt(*mContext, mKeyHandle, in, mOutBuf);
 419                 }
 420                 else {
 421                         clientSession().decrypt(*mContext, mKeyHandle, in, mOutBuf);
 422                 }
 423                 /* leave the accumulator as is in case of unexpected sequence */
 424                 ssCryptDebug("   ===outSize(pre-op) %u", (unsigned)mOutBuf.Length);
 425                 return mOutBuf.Length;
 426         }
 427         else {
 428                 /* out-of-band case, ask CSP via SS */
 429                 uint32 outSize = clientSession().getOutputSize(*mContext,
 430                         mKeyHandle,
 431                         inBufSize + inSize,
 432                         encoding());
 433                 ssCryptDebug("   ===outSize(RPC) %u", (unsigned)outSize);
 434                 return (size_t)outSize;
 435         }
 436 }
 437
 438 void
 439 SDCryptContext::minimumProgress(size_t &in, size_t &out)
 440 {
 441         in = 1;
 442         out = 0;
 443 }
 444
 445 void
 446 SDCryptContext::update(void *inp, size_t &inSize, void *outp, size_t &outSize)
 447 {
 448         ssCryptDebug("===update inSize=%u", (unsigned)inSize);
 449         /* add incoming data to accumulator */
 450         mNullDigest.digestUpdate(inp, inSize);
 451         outSize = 0;
 452         clearOutBuf();
 453 }
 454
 455 void
 456 SDCryptContext::final(CssmData &out)
 457 {
 458         if(mOutBuf.Data != NULL) {
 459                 /* normal final case in which the actual RPC via SS was done in the
 460                  * previous outputSize() call. A memcpy is needed here because
 461                  * CSPFullPluginSession has just allocated the buf size we need. */
 462                 ssCryptDebug("===final via pre-op and copy");
 463                 copyOutBuf(out);
 464                 return;
 465         }
 466
 467         /* when is this path taken...? */
 468         ssCryptDebug("===final via RPC");
 469         size_t inSize = mNullDigest.digestSizeInBytes();
 470         if(!inSize) return;
 471
 472         const CssmData in(const_cast<void *>(mNullDigest.digestPtr()), inSize);
 473         IFDEBUG(unsigned origOutSize = out.length());
 474         if (encoding()) {
 475                 clientSession().encrypt(*mContext, mKeyHandle, in, out);
 476         }
 477         else {
 478                 clientSession().decrypt(*mContext, mKeyHandle, in, out);
 479         }
 480         assert(out.length() <= origOutSize);
 481         mNullDigest.digestInit();
 482 }
 483
 484 // Digest, using raw CSP
 485 SDDigestContext::SDDigestContext(SDCSPSession &session)
 486         : SDContext(session), mDigest(NULL)
 487 {
 488
 489 }
 490
 491 SDDigestContext::~SDDigestContext()
 492 {
 493         delete mDigest;
 494 }
 495
 496 void SDDigestContext::init(const Context &context, bool encoding)
 497 {
 498         CSSM_ALGORITHMS alg;
 499
 500         SDContext::init(context, encoding);
 501         alg = context.algorithm();
 502         mDigest = new CssmClient::Digest(mSession.mRawCsp, alg);
 503 }
 504
 505 void SDDigestContext::update(const CssmData &data)
 506 {
 507         mDigest->digest(data);
 508 }
 509
 510 void SDDigestContext::final(CssmData &out)
 511 {
 512         (*mDigest)(out);
 513 }
 514
 515 size_t SDDigestContext::outputSize(bool final, size_t inSize)
 516 {
 517         if(!final) {
 518                 return 0;
 519         }
 520         else {
 521                 return (size_t)mDigest->getOutputSize(inSize);
 522         }
 523 }
 524
 525 // MACContext - common class for MAC generate, verify
 526 SDMACContext::SDMACContext(SDCSPSession &session)
 527         : SDContext(session), mKeyHandle(noKey)
 528 {
 529
 530 }
 531
 532 void SDMACContext::init(const Context &context, bool encoding)
 533 {
 534         SDContext::init(context, encoding);
 535
 536         /* reusable; reset accumulator */
 537         mNullDigest.digestInit();
 538
 539         /* snag key from context */
 540         const CssmKey &keyInContext =
 541                 context.get<const CssmKey>(CSSM_ATTRIBUTE_KEY,
 542                                                                    CSSMERR_CSP_MISSING_ATTR_KEY);
 543         mKeyHandle = mSession.lookupKey(keyInContext).keyHandle();
 544 }
 545
 546 void SDMACContext::update(const CssmData &data)
 547 {
 548         /* add incoming data to accumulator */
 549         mNullDigest.digestUpdate(data.data(), data.length());
 550 }
 551
 552 size_t SDMACContext::outputSize(bool final, size_t inSize)
 553 {
 554         if(!final) {
 555                 ssCryptDebug("===mac outputSize !final\n");
 556                 return 0;
 557         }
 558         if(!encoding()) {
 559                 ssCryptDebug("===mac outputSize final, !encoding\n");
 560                 /* don't see why this is even called... */
 561                 return 0;
 562         }
 563         if(inSize == 0) {
 564                 /*
 565                  * This is the implied signal to go for it.
 566                  */
 567                 clearOutBuf();
 568                 genMac(mOutBuf);
 569                 ssCryptDebug("===mac outputSize(pre-op) %u", (unsigned)mOutBuf.Length);
 570                 return (size_t)mOutBuf.Length;
 571         }
 572         else {
 573                 /* out-of-band case, ask CSP via SS */
 574                 uint32 outSize = clientSession().getOutputSize(*mContext,
 575                         mKeyHandle,
 576                         inSize + mNullDigest.digestSizeInBytes(),
 577                         true);
 578                 ssCryptDebug("===mac outputSize(RPC) %u", (unsigned)outSize);
 579                 return (size_t)outSize;
 580         }
 581 }
 582
 583 /* generate */
 584
 585 /* first the common routine used by final() and outputSize() */
 586 void SDMACContext::genMac(CssmData &mac)
 587 {
 588         CssmData allData(const_cast<void *>(mNullDigest.digestPtr()),
 589                 mNullDigest.digestSizeInBytes());
 590         clientSession().generateMac(*mContext, mKeyHandle, allData, mac);
 591 }
 592
 593 void SDMACContext::final(CssmData &mac)
 594 {
 595         genMac(mac);
 596 }
 597
 598 /* verify */
 599 void SDMACContext::final(const CssmData &mac)
 600 {
 601         CssmData allData(const_cast<void *>(mNullDigest.digestPtr()),
 602                 mNullDigest.digestSizeInBytes());
 603         clientSession().verifyMac(*mContext, mKeyHandle, allData, mac);
 604 }