libsecurity_ssl/lib/sslCert.c

   1 /*
   2  * Copyright (c) 1999-2001,2005-2012 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  * sslCert.c - certificate request/verify messages
  26  */
  27
  28 #include "ssl.h"
  29 #include "sslContext.h"
  30 #include "sslHandshake.h"
  31 #include "sslMemory.h"
  32 #include "sslAlertMessage.h"
  33 #include "sslDebug.h"
  34 #include "sslUtils.h"
  35 #include "sslDigests.h"
  36 #include "sslCrypto.h"
  37
  38 #include <string.h>
  39 #include <assert.h>
  40 #include <CoreFoundation/CoreFoundation.h>
  41 #include <Security/SecCertificate.h>
  42 #include <Security/SecCertificatePriv.h>
  43 #include <Security/oidsalg.h>
  44 #include "utilities/SecCFRelease.h"
  45
  46
  47 OSStatus
  48 SSLEncodeCertificate(SSLRecord *certificate, SSLContext *ctx)
  49 {   OSStatus            err;
  50     size_t              totalLength;
  51     UInt8               *charPtr;
  52     CFIndex             i, certCount;
  53 #ifdef USE_SSLCERTIFICATE
  54     int                 j;
  55     SSLCertificate      *cert;
  56 #else
  57     CFArrayRef                  certChain;
  58 #endif
  59     int                 head;
  60
  61     /*
  62          * TBD: for client side, match Match DER-encoded acceptable DN list
  63          * (ctx->acceptableDNList) to one of our certs. For now we just send
  64          * what we have since we don't support multiple certs.
  65          *
  66          * Note this can be called with localCert==0 for client side in TLS1+ and DTLS;
  67          * in that case we send an empty cert msg.
  68          */
  69         assert(ctx->negProtocolVersion >= SSL_Version_3_0);
  70         assert((ctx->localCert != NULL) || (ctx->negProtocolVersion >= TLS_Version_1_0));
  71     totalLength = 0;
  72
  73 #ifdef USE_SSLCERTIFICATE
  74     certCount = 0;
  75     cert = ctx->localCert;
  76     while (cert)
  77     {   totalLength += 3 + cert->derCert.length;    /* 3 for encoded length field */
  78         ++certCount;
  79         cert = cert->next;
  80     }
  81 #else
  82     certChain = ctx->localCert;
  83         certCount = certChain ? CFArrayGetCount(certChain) : 0;
  84         for (i = 0; i < certCount; ++i) {
  85                 SecCertificateRef cert = (SecCertificateRef)CFArrayGetValueAtIndex(certChain, i);
  86                 totalLength += 3 + SecCertificateGetLength(cert);    /* 3 for encoded length field */
  87         }
  88 #endif
  89     certificate->contentType = SSL_RecordTypeHandshake;
  90     certificate->protocolVersion = ctx->negProtocolVersion;
  91     head = SSLHandshakeHeaderSize(certificate);
  92     if ((err = SSLAllocBuffer(&certificate->contents, totalLength + head + 3)))
  93         return err;
  94
  95     charPtr = SSLEncodeHandshakeHeader(ctx, certificate, SSL_HdskCert, totalLength+3);
  96
  97     charPtr = SSLEncodeSize(charPtr, totalLength, 3);      /* Vector length */
  98
  99 #ifdef USE_SSLCERTIFICATE
 100     /* Root cert is first in the linked list, but has to go last,
 101          * so walk list backwards */
 102     for (i = 0; i < certCount; ++i)
 103     {   cert = ctx->localCert;
 104         for (j = i+1; j < certCount; ++j)
 105             cert = cert->next;
 106         charPtr = SSLEncodeSize(charPtr, cert->derCert.length, 3);
 107         memcpy(charPtr, cert->derCert.data, cert->derCert.length);
 108         charPtr += cert->derCert.length;
 109     }
 110 #else
 111     /* Root cert is last in the array, and has to go last,
 112          * so walk list forwards */
 113         for (i = 0; i < certCount; ++i) {
 114                 SecCertificateRef cert = (SecCertificateRef)CFArrayGetValueAtIndex(certChain, i);
 115                 CFIndex certLength = SecCertificateGetLength(cert);
 116         charPtr = SSLEncodeSize(charPtr, certLength, 3);
 117         memcpy(charPtr, SecCertificateGetBytePtr(cert), certLength);
 118         charPtr += certLength;
 119     }
 120 #endif
 121
 122     assert(charPtr == certificate->contents.data + certificate->contents.length);
 123
 124     if ((ctx->protocolSide == kSSLClientSide) && (ctx->localCert)) {
 125                 /* this tells us to send a CertificateVerify msg after the
 126                  * client key exchange. We skip the cert vfy if we just
 127                  * sent an empty cert msg (i.e., we were asked for a cert
 128                  * but we don't have one). */
 129         ctx->certSent = 1;
 130                 assert(ctx->clientCertState == kSSLClientCertRequested);
 131                 assert(ctx->certRequested);
 132                 ctx->clientCertState = kSSLClientCertSent;
 133         }
 134         if(certCount == 0) {
 135                 sslCertDebug("...sending empty cert msg");
 136         }
 137     return errSecSuccess;
 138 }
 139
 140 OSStatus
 141 SSLProcessCertificate(SSLBuffer message, SSLContext *ctx)
 142 {
 143     size_t          listLen, certLen;
 144     UInt8           *p;
 145     OSStatus        err;
 146 #ifdef USE_SSLCERTIFICATE
 147     SSLCertificate      *cert;
 148 #else
 149     CFMutableArrayRef   certChain = NULL;
 150     SecCertificateRef   cert;
 151 #endif
 152
 153     p = message.data;
 154     listLen = SSLDecodeInt(p,3);
 155     p += 3;
 156     if (listLen + 3 != message.length) {
 157         sslErrorLog("SSLProcessCertificate: length decode error 1\n");
 158         return errSSLProtocol;
 159     }
 160
 161     while (listLen > 0)
 162     {   certLen = SSLDecodeInt(p,3);
 163         p += 3;
 164         if (listLen < certLen + 3) {
 165                 sslErrorLog("SSLProcessCertificate: length decode error 2\n");
 166             return errSSLProtocol;
 167         }
 168 #ifdef USE_SSLCERTIFICATE
 169                 cert = (SSLCertificate *)sslMalloc(sizeof(SSLCertificate));
 170                 if(cert == NULL) {
 171                         return errSecAllocate;
 172                 }
 173         if ((err = SSLAllocBuffer(&cert->derCert, certLen)
 174         {   sslFree(cert);
 175             return err;
 176         }
 177         memcpy(cert->derCert.data, p, certLen);
 178         p += certLen;
 179         cert->next = ctx->peerCert;     /* Insert backwards; root cert
 180                                                                                  * will be first in linked list */
 181         ctx->peerCert = cert;
 182 #else
 183                 if (!certChain) {
 184                         certChain = CFArrayCreateMutable(kCFAllocatorDefault, 0,
 185                                 &kCFTypeArrayCallBacks);
 186                         if (certChain == NULL) {
 187                                 return errSecAllocate;
 188                         }
 189                         if (ctx->peerCert) {
 190                                 sslDebugLog("SSLProcessCertificate: releasing existing cert chain\n");
 191                                 CFRelease(ctx->peerCert);
 192                         }
 193                         ctx->peerCert = certChain;
 194                 }
 195                 cert = SecCertificateCreateWithBytes(NULL, p, certLen);
 196                 #if SSL_DEBUG && !TARGET_OS_IPHONE
 197                 {
 198                         /* print cert name when debugging; leave disabled otherwise */
 199                         CFStringRef certName = NULL;
 200                         OSStatus status = SecCertificateInferLabel(cert, &certName);
 201                         char buf[1024];
 202                         if (status || !certName || !CFStringGetCString(certName, buf, 1024-1, kCFStringEncodingUTF8)) { buf[0]=0; }
 203                         sslDebugLog("SSLProcessCertificate: err=%d, received \"%s\" (%ld bytes)\n",(int) status, buf, certLen);
 204                         CFReleaseSafe(certName);
 205                 }
 206                 #endif
 207                 if (cert == NULL) {
 208                         sslErrorLog("SSLProcessCertificate: unable to create cert ref from data\n");
 209                         return errSecAllocate;
 210                 }
 211         p += certLen;
 212                 /* Insert forwards; root cert will be last in linked list */
 213                 CFArrayAppendValue(certChain, cert);
 214                 CFRelease(cert);
 215 #endif
 216         listLen -= 3+certLen;
 217     }
 218     assert(p == message.data + message.length && listLen == 0);
 219
 220     if (!ctx->peerCert) {
 221                 /* this *might* be OK... */
 222                 if((ctx->protocolSide == kSSLServerSide) &&
 223                    (ctx->clientAuth != kAlwaysAuthenticate)) {
 224                         /*
 225                          * we tried to authenticate, client doesn't have a cert, and
 226                          * app doesn't require it. OK.
 227                          */
 228                         return errSecSuccess;
 229                 }
 230                 else {
 231                         AlertDescription desc;
 232                         if(ctx->negProtocolVersion == SSL_Version_3_0) {
 233                                 /* this one's for SSL3 only */
 234                                 desc = SSL_AlertBadCert;
 235                         }
 236                         else {
 237                                 desc = SSL_AlertCertUnknown;
 238                         }
 239                         SSLFatalSessionAlert(desc, ctx);
 240                         return errSSLXCertChainInvalid;
 241                 }
 242     }
 243
 244     if((err = sslVerifyCertChain(ctx, ctx->peerCert, true)) != 0) {
 245         AlertDescription desc;
 246         switch(err) {
 247         case errSSLUnknownRootCert:
 248         case errSSLNoRootCert:
 249             desc = SSL_AlertUnknownCA;
 250             break;
 251         case errSSLCertExpired:
 252         case errSSLCertNotYetValid:
 253             desc = SSL_AlertCertExpired;
 254             break;
 255         case errSSLXCertChainInvalid:
 256         default:
 257             desc = SSL_AlertCertUnknown;
 258             break;
 259         }
 260         SSLFatalSessionAlert(desc, ctx);
 261     }
 262
 263     if (err == errSecSuccess) {
 264         if(ctx->peerPubKey != NULL) {
 265             /* renegotiating - free old key first */
 266             sslFreePubKey(&ctx->peerPubKey);
 267         }
 268         err = sslCopyPeerPubKey(ctx, &ctx->peerPubKey);
 269     }
 270
 271     /* Now that cert verification is done, update context state */
 272     /* (this code was formerly in SSLProcessHandshakeMessage, */
 273     /* directly after the return from SSLProcessCertificate) */
 274     if(ctx->protocolSide == kSSLServerSide) {
 275         if(err) {
 276             /*
 277              * Error could be from no cert (when we require one)
 278              * or invalid cert
 279              */
 280             if(ctx->peerCert != NULL) {
 281                 ctx->clientCertState = kSSLClientCertRejected;
 282             }
 283         } else if(ctx->peerCert != NULL) {
 284             /*
 285              * This still might change if cert verify msg
 286              * fails. Note we avoid going to state
 287              * if we get en empty cert message which is
 288              * otherwise valid.
 289              */
 290             ctx->clientCertState = kSSLClientCertSent;
 291         }
 292
 293         /*
 294          * Schedule return to the caller to verify the client's identity.
 295          * Note that an error during processing will cause early
 296          * termination of the handshake.
 297          */
 298         if (ctx->breakOnClientAuth) {
 299             ctx->signalClientAuth = true;
 300         }
 301     } else {
 302         /*
 303          * Schedule return to the caller to verify the server's identity.
 304          * Note that an error during processing will cause early
 305          * termination of the handshake.
 306          */
 307         if (ctx->breakOnServerAuth) {
 308             ctx->signalServerAuth = true;
 309         }
 310     }
 311
 312     return err;
 313 }
 314
 315 OSStatus
 316 SSLEncodeCertificateRequest(SSLRecord *request, SSLContext *ctx)
 317 {
 318         OSStatus    err;
 319     size_t      shListLen = 0, dnListLen, msgLen;
 320     UInt8       *charPtr;
 321     DNListElem  *dn;
 322     int         head;
 323
 324         assert(ctx->protocolSide == kSSLServerSide);
 325     if (sslVersionIsLikeTls12(ctx)) {
 326         shListLen = 2 + 2 * (ctx->ecdsaEnable ? 5 : 3);  //FIXME: 5:3 should not be hardcoded here.
 327     }
 328
 329         dnListLen = 0;
 330     dn = ctx->acceptableDNList;
 331     while (dn)
 332     {   dnListLen += 2 + dn->derDN.length;
 333         dn = dn->next;
 334     }
 335     msgLen = 1 +        // number of cert types
 336                          2 +    // cert types
 337              shListLen +  // SignatureAlgorithms
 338                          2 +    // length of DN list
 339                          dnListLen;
 340
 341     request->contentType = SSL_RecordTypeHandshake;
 342     assert(ctx->negProtocolVersion >= SSL_Version_3_0);
 343
 344     request->protocolVersion = ctx->negProtocolVersion;
 345     head = SSLHandshakeHeaderSize(request);
 346     if ((err = SSLAllocBuffer(&request->contents, msgLen + head)))
 347         return err;
 348
 349     charPtr = SSLEncodeHandshakeHeader(ctx, request, SSL_HdskCertRequest, msgLen);
 350
 351     *charPtr++ = 2;        /* two cert types */
 352     *charPtr++ = SSLClientAuth_RSASign;
 353     *charPtr++ = SSLClientAuth_ECDSASign;
 354
 355     if (shListLen) {
 356         /* Encode the supported_signature_algorithms added in TLS1.2 */
 357         /* We dont support SHA512 or SHA224 because we didnot implement the digest abstraction for those
 358            and we dont keep a running hash for those.
 359            We dont support SHA384/ECDSA because corecrypto ec does not support it with 256 bits curves */
 360         charPtr = SSLEncodeSize(charPtr, shListLen - 2, 2);
 361         // *charPtr++ = SSL_HashAlgorithmSHA512;
 362         // *charPtr++ = SSL_SignatureAlgorithmRSA;
 363         *charPtr++ = SSL_HashAlgorithmSHA384;
 364         *charPtr++ = SSL_SignatureAlgorithmRSA;
 365         *charPtr++ = SSL_HashAlgorithmSHA256;
 366         *charPtr++ = SSL_SignatureAlgorithmRSA;
 367         // *charPtr++ = SSL_HashAlgorithmSHA224;
 368         // *charPtr++ = SSL_SignatureAlgorithmRSA;
 369         *charPtr++ = SSL_HashAlgorithmSHA1;
 370         *charPtr++ = SSL_SignatureAlgorithmRSA;
 371         if (ctx->ecdsaEnable) {
 372             // *charPtr++ = SSL_HashAlgorithmSHA512;
 373             // *charPtr++ = SSL_SignatureAlgorithmECDSA;
 374             // *charPtr++ = SSL_HashAlgorithmSHA384;
 375             // *charPtr++ = SSL_SignatureAlgorithmECDSA;
 376             *charPtr++ = SSL_HashAlgorithmSHA256;
 377             *charPtr++ = SSL_SignatureAlgorithmECDSA;
 378             // *charPtr++ = SSL_HashAlgorithmSHA224;
 379             // *charPtr++ = SSL_SignatureAlgorithmECDSA;
 380             *charPtr++ = SSL_HashAlgorithmSHA1;
 381             *charPtr++ = SSL_SignatureAlgorithmECDSA;
 382         }
 383     }
 384
 385     charPtr = SSLEncodeSize(charPtr, dnListLen, 2);
 386     dn = ctx->acceptableDNList;
 387     while (dn)
 388     {   charPtr = SSLEncodeSize(charPtr, dn->derDN.length, 2);
 389         memcpy(charPtr, dn->derDN.data, dn->derDN.length);
 390         charPtr += dn->derDN.length;
 391         dn = dn->next;
 392     }
 393
 394     assert(charPtr == request->contents.data + request->contents.length);
 395     return errSecSuccess;
 396 }
 397
 398 #define SSL_ENABLE_ECDSA_SIGN_AUTH                      0
 399 #define SSL_ENABLE_RSA_FIXED_ECDH_AUTH          0
 400 #define SSL_ENABLE_ECDSA_FIXED_ECDH_AUTH        0
 401
 402 OSStatus
 403 SSLProcessCertificateRequest(SSLBuffer message, SSLContext *ctx)
 404 {
 405     unsigned        i;
 406     unsigned        typeCount;
 407     unsigned            shListLen = 0;
 408     UInt8           *charPtr;
 409     unsigned            dnListLen;
 410         unsigned                dnLen;
 411     SSLBuffer           dnBuf;
 412     DNListElem          *dn;
 413         OSStatus                err;
 414
 415         /*
 416          * Cert request only happens in during client authentication.
 417          * We'll send a client cert if we have an appropriate one, but
 418          * we don't do any DNList compare.
 419          */
 420     unsigned minLen = (sslVersionIsLikeTls12(ctx)) ? 5 : 3;
 421     if (message.length < minLen) {
 422         sslErrorLog("SSLProcessCertificateRequest: length decode error 1\n");
 423         return errSSLProtocol;
 424     }
 425     charPtr = message.data;
 426     typeCount = *charPtr++;
 427     if (typeCount < 1 || message.length < minLen + typeCount) {
 428         sslErrorLog("SSLProcessCertificateRequest: length decode error 2\n");
 429         return errSSLProtocol;
 430     }
 431         if(typeCount != 0) {
 432                 /* Store server-specified auth types */
 433                 if(ctx->clientAuthTypes != NULL) {
 434                         sslFree(ctx->clientAuthTypes);
 435                 }
 436                 ctx->clientAuthTypes = (SSLClientAuthenticationType *)
 437                         sslMalloc(typeCount * sizeof(SSLClientAuthenticationType));
 438                 for(i=0; i<typeCount; i++) {
 439                         sslLogNegotiateDebug("===Server specifies authType %d", (int)(*charPtr));
 440                         ctx->clientAuthTypes[i] = (SSLClientAuthenticationType)(*charPtr++);
 441                 }
 442                 ctx->numAuthTypes = typeCount;
 443     }
 444
 445     if (sslVersionIsLikeTls12(ctx)) {
 446         /* Parse the supported_signature_algorithms field added in TLS1.2 */
 447         shListLen = SSLDecodeInt(charPtr, 2);
 448         charPtr += 2;
 449         if (message.length < minLen + typeCount + shListLen) {
 450             sslErrorLog("SSLProcessCertificateRequest: length decode error 3\n");
 451             return errSSLProtocol;
 452         }
 453
 454         if (shListLen & 1) {
 455             sslErrorLog("SSLProcessCertificateRequest: signAlg len odd\n");
 456             return errSSLProtocol;
 457         }
 458                 ctx->numServerSigAlgs = shListLen / 2;
 459                 if(ctx->serverSigAlgs != NULL) {
 460                         sslFree(ctx->serverSigAlgs);
 461                 }
 462                 ctx->serverSigAlgs = (SSLSignatureAndHashAlgorithm *)
 463         sslMalloc((ctx->numServerSigAlgs) * sizeof(SSLSignatureAndHashAlgorithm));
 464                 for(i=0; i<ctx->numServerSigAlgs; i++) {
 465             /* TODO: Validate hash and signature fields. */
 466                         ctx->serverSigAlgs[i].hash = *charPtr++;
 467                         ctx->serverSigAlgs[i].signature = *charPtr++;
 468                         sslLogNegotiateDebug("===Server specifies sigAlg %d %d",
 469                                  ctx->serverSigAlgs[i].hash,
 470                                  ctx->serverSigAlgs[i].signature);
 471                 }
 472     }
 473
 474         /* if a client cert is set, it must match a server-specified auth type */
 475         err = SSLUpdateNegotiatedClientAuthType(ctx);
 476
 477         /* obtain server's DNList */
 478     dnListLen = SSLDecodeInt(charPtr, 2);
 479     charPtr += 2;
 480     if (message.length != minLen + typeCount + shListLen + dnListLen) {
 481         sslErrorLog("SSLProcessCertificateRequest: length decode error 3\n");
 482         return errSSLProtocol;
 483         }
 484     while (dnListLen > 0)
 485     {   if (dnListLen < 2) {
 486                 sslErrorLog("SSLProcessCertificateRequest: dnListLen error 1\n");
 487             return errSSLProtocol;
 488         }
 489         dnLen = SSLDecodeInt(charPtr, 2);
 490         charPtr += 2;
 491         if (dnListLen < 2 + dnLen) {
 492                 sslErrorLog("SSLProcessCertificateRequest: dnListLen error 2\n");
 493                 return errSSLProtocol;
 494         }
 495         if ((err = SSLAllocBuffer(&dnBuf, sizeof(DNListElem))))
 496             return err;
 497         dn = (DNListElem*)dnBuf.data;
 498         if ((err = SSLAllocBuffer(&dn->derDN, dnLen)))
 499         {   SSLFreeBuffer(&dnBuf);
 500             return err;
 501         }
 502         memcpy(dn->derDN.data, charPtr, dnLen);
 503         charPtr += dnLen;
 504         dn->next = ctx->acceptableDNList;
 505         ctx->acceptableDNList = dn;
 506         dnListLen -= 2 + dnLen;
 507     }
 508
 509     assert(charPtr == message.data + message.length);
 510
 511     return errSecSuccess;
 512 }
 513
 514
 515 /* TODO: this should be refactored with FindSigAlg in sslKeyExchange.c */
 516 static
 517 OSStatus FindCertSigAlg(SSLContext *ctx,
 518                         SSLSignatureAndHashAlgorithm *alg)
 519 {
 520     unsigned i;
 521
 522     assert(ctx->protocolSide == kSSLClientSide);
 523     assert(ctx->negProtocolVersion >= TLS_Version_1_2);
 524     assert(!ctx->isDTLS);
 525
 526     if((ctx->numServerSigAlgs==0) ||(ctx->serverSigAlgs==NULL))
 527         return errSSLInternal;
 528
 529     for(i=0; i<ctx->numServerSigAlgs; i++) {
 530         alg->hash = ctx->serverSigAlgs[i].hash;
 531         alg->signature = ctx->serverSigAlgs[i].signature;
 532         // We only support RSA cert for our own certs.
 533         if(ctx->serverSigAlgs[i].signature != SSL_SignatureAlgorithmRSA)
 534             continue;
 535
 536         //Let's only support SHA1 and SHA256. SHA384 does not work with 512 bits RSA keys
 537         // We should actually test against what the client cert can do.
 538         if((alg->hash==SSL_HashAlgorithmSHA1) || (alg->hash==SSL_HashAlgorithmSHA256)) {
 539             return errSecSuccess;
 540         }
 541     }
 542     // We could not find a supported signature and hash algorithm
 543     return errSSLProtocol;
 544 }
 545
 546 OSStatus
 547 SSLEncodeCertificateVerify(SSLRecord *certVerify, SSLContext *ctx)
 548 {   OSStatus        err;
 549     UInt8           hashData[SSL_MAX_DIGEST_LEN];
 550     SSLBuffer       hashDataBuf;
 551     size_t          len;
 552     size_t                  outputLen;
 553     UInt8           *charPtr;
 554     int             head;
 555     size_t          maxSigLen;
 556     bool            isRSA = false;
 557
 558     certVerify->contents.data = 0;
 559     hashDataBuf.data = hashData;
 560     hashDataBuf.length = SSL_MAX_DIGEST_LEN;
 561
 562
 563         assert(ctx->signingPrivKeyRef != NULL);
 564     err = sslGetMaxSigSize(ctx->signingPrivKeyRef, &maxSigLen);
 565     if(err) {
 566         goto fail;
 567     }
 568
 569         switch(ctx->negAuthType) {
 570                 case SSLClientAuth_RSASign:
 571             isRSA = true;
 572                         break;
 573 #if SSL_ENABLE_ECDSA_SIGN_AUTH
 574                 case SSLClientAuth_ECDSASign:
 575                         break;
 576 #endif
 577                 default:
 578                         /* shouldn't be here */
 579                         assert(0);
 580                         return errSSLInternal;
 581         }
 582
 583     certVerify->contentType = SSL_RecordTypeHandshake;
 584         assert(ctx->negProtocolVersion >= SSL_Version_3_0);
 585     certVerify->protocolVersion = ctx->negProtocolVersion;
 586     head = SSLHandshakeHeaderSize(certVerify);
 587
 588     outputLen = maxSigLen + head + 2;
 589
 590     SSLSignatureAndHashAlgorithm sigAlg;
 591
 592     if (sslVersionIsLikeTls12(ctx)) {
 593         err=FindCertSigAlg(ctx, &sigAlg);
 594         if(err)
 595             goto fail;
 596         outputLen += 2;
 597     }
 598
 599     assert(ctx->sslTslCalls != NULL);
 600     if ((err = ctx->sslTslCalls->computeCertVfyMac(ctx, &hashDataBuf, sigAlg.hash)) != 0)
 601         goto fail;
 602
 603     if ((err = SSLAllocBuffer(&certVerify->contents, outputLen)) != 0)
 604         goto fail;
 605
 606     /* Sign now to get the actual length */
 607     charPtr = certVerify->contents.data+head;
 608
 609     if (sslVersionIsLikeTls12(ctx))
 610     {
 611         *charPtr++ = sigAlg.hash;
 612         *charPtr++ = sigAlg.signature;
 613
 614         /* We don't support anything but RSA for client side auth yet */
 615         assert(isRSA);
 616         SecAsn1AlgId algId;
 617         switch (sigAlg.hash) {
 618             case SSL_HashAlgorithmSHA384:
 619                 algId.algorithm = CSSMOID_SHA384WithRSA;
 620                 break;
 621             case SSL_HashAlgorithmSHA256:
 622                 algId.algorithm = CSSMOID_SHA256WithRSA;
 623                 break;
 624             case SSL_HashAlgorithmSHA1:
 625                 algId.algorithm = CSSMOID_SHA1WithRSA;
 626                 break;
 627             default:
 628                                 sslErrorLog("SSLEncodeCertificateVerify: unsupported signature hash algorithm (%d)\n",
 629                                         sigAlg.hash);
 630                 assert(0);          // if you get here, something is wrong in FindCertSigAlg
 631                 err=errSSLInternal;
 632                 goto fail;
 633         }
 634
 635         err = sslRsaSign(ctx,
 636                          ctx->signingPrivKeyRef,
 637                          &algId,
 638                          hashData,
 639                          hashDataBuf.length,
 640                          charPtr+2,
 641                          maxSigLen,
 642                          &outputLen);
 643         len=outputLen+2+2;
 644     } else {
 645         err = sslRawSign(ctx,
 646             ctx->signingPrivKeyRef,
 647             hashData,                                           // data to sign
 648             hashDataBuf.length,                         // Data to sign size
 649             charPtr+2,  // signature destination
 650             maxSigLen,                                                  // we mallocd len+head+2
 651             &outputLen);
 652         len = outputLen+2;
 653     }
 654         if(err) {
 655                 sslErrorLog("SSLEncodeCertificateVerify: unable to sign data (error %d)\n", (int)err);
 656                 goto fail;
 657         }
 658     // At this point:
 659     //  len = message length
 660     //  outputlen = sig length
 661         certVerify->contents.length = len + head;
 662
 663     /* charPtr point at the len field here */
 664     charPtr = SSLEncodeSize(charPtr, outputLen, 2);
 665     charPtr = SSLEncodeHandshakeHeader(ctx, certVerify, SSL_HdskCertVerify, len);
 666
 667     assert(charPtr==(certVerify->contents.data+head));
 668
 669     err = errSecSuccess;
 670
 671 fail:
 672
 673     return err;
 674 }
 675
 676 OSStatus
 677 SSLProcessCertificateVerify(SSLBuffer message, SSLContext *ctx)
 678 {   OSStatus        err;
 679     UInt8           hashData[SSL_MAX_DIGEST_LEN];
 680     size_t          signatureLen;
 681     SSLBuffer       hashDataBuf;
 682     size_t          publicModulusLen;
 683     uint8_t         *charPtr = message.data;
 684         uint8_t         *endCp = charPtr + message.length;
 685
 686     SSLSignatureAndHashAlgorithm    sigAlg;
 687     SecAsn1AlgId                    algId;
 688
 689     if (ctx->isDTLS
 690         ? ctx->negProtocolVersion < DTLS_Version_1_0
 691         : ctx->negProtocolVersion >= TLS_Version_1_2) {
 692         /* Parse the algorithm field added in TLS1.2 */
 693         if((charPtr+2) > endCp) {
 694             sslErrorLog("SSLProcessCertificateVerify: msg len error 1\n");
 695             return errSSLProtocol;
 696         }
 697         sigAlg.hash = *charPtr++;
 698         sigAlg.signature = *charPtr++;
 699
 700         switch (sigAlg.hash) {
 701             case SSL_HashAlgorithmSHA256:
 702                 algId.algorithm = CSSMOID_SHA256WithRSA;
 703                 if(ctx->selectedCipherSpecParams.macAlg == HA_SHA384) {
 704                     sslErrorLog("SSLProcessCertificateVerify: inconsistent hash, HA_SHA384\n");
 705                     return errSSLInternal;
 706                 }
 707                 break;
 708             case SSL_HashAlgorithmSHA384:
 709                 algId.algorithm = CSSMOID_SHA384WithRSA;
 710                 if(ctx->selectedCipherSpecParams.macAlg != HA_SHA384) {
 711                     sslErrorLog("SSLProcessCertificateVerify: inconsistent hash, %d not HA_SHA384\n", ctx->selectedCipherSpecParams.macAlg);
 712                     return errSSLInternal;
 713                 }
 714                 break;
 715             default:
 716                 sslErrorLog("SSLProcessCertificateVerify: unsupported hash %d\n", sigAlg.hash);
 717                 return errSSLProtocol;
 718         }
 719     }
 720
 721     if ((charPtr + 2) > endCp) {
 722         sslErrorLog("SSLProcessCertificateVerify: msg len error\n");
 723         return errSSLProtocol;
 724     }
 725
 726     signatureLen = SSLDecodeSize(charPtr, 2);
 727     charPtr += 2;
 728     if ((charPtr + signatureLen) > endCp) {
 729         sslErrorLog("SSLProcessCertificateVerify: sig len error 1\n");
 730         return errSSLProtocol;
 731     }
 732
 733         publicModulusLen = sslPubKeyLengthInBytes(ctx->peerPubKey);
 734
 735         #if 0
 736     if (signatureLen != publicModulusLen) {
 737         sslErrorLog("SSLProcessCertificateVerify: sig len error 2\n");
 738         return errSSLProtocol;
 739     }
 740         #endif
 741         if (publicModulusLen == 0) {
 742                 sslErrorLog("SSLProcessCertificateVerify: pub key modulus is 0\n");
 743         }
 744
 745     hashDataBuf.data = hashData;
 746     hashDataBuf.length = SSL_MAX_DIGEST_LEN;
 747
 748         assert(ctx->sslTslCalls != NULL);
 749     if ((err = ctx->sslTslCalls->computeCertVfyMac(ctx, &hashDataBuf, sigAlg.hash)) != 0)
 750         goto fail;
 751
 752     if (sslVersionIsLikeTls12(ctx))
 753     {
 754         if(sigAlg.signature==SSL_SignatureAlgorithmRSA) {
 755             err = sslRsaVerify(ctx,
 756                                ctx->peerPubKey,
 757                                &algId,
 758                                hashData,
 759                                hashDataBuf.length,
 760                                charPtr,
 761                                signatureLen);
 762         } else {
 763             err = sslRawVerify(ctx,
 764                                ctx->peerPubKey,
 765                                hashData,
 766                                hashDataBuf.length,
 767                                charPtr,
 768                                signatureLen);
 769         }
 770     } else {
 771         /* sslRawVerify does the decrypt & compare for us in one shot. */
 772         err = sslRawVerify(ctx,
 773             ctx->peerPubKey,
 774             hashData,                           // data to verify
 775             hashDataBuf.length,
 776             charPtr,            // signature
 777             signatureLen);
 778     }
 779
 780     if(err) {
 781                 SSLFatalSessionAlert(SSL_AlertDecryptError, ctx);
 782                 goto fail;
 783         }
 784     err = errSecSuccess;
 785
 786 fail:
 787     return err;
 788 }