LCOV - code coverage report
Current view: top level - security/manager/ssl - ScopedNSSTypes.h (source / functions) Hit Total Coverage
Test: output.info Lines: 31 105 29.5 %
Date: 2017-07-14 16:53:18 Functions: 12 46 26.1 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* vim: set ts=2 et sw=2 tw=80: */
       3             : /* This Source Code Form is subject to the terms of the Mozilla Public
       4             :  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
       5             :  * You can obtain one at http://mozilla.org/MPL/2.0/. */
       6             : 
       7             : // This header provides smart pointers and various helpers for code that needs
       8             : // to interact with NSS.
       9             : 
      10             : #ifndef ScopedNSSTypes_h
      11             : #define ScopedNSSTypes_h
      12             : 
      13             : #include <limits>
      14             : #include <memory>
      15             : 
      16             : #include "cert.h"
      17             : #include "cms.h"
      18             : #include "cryptohi.h"
      19             : #include "keyhi.h"
      20             : #include "mozilla/Likely.h"
      21             : #include "mozilla/UniquePtr.h"
      22             : #include "nsDebug.h"
      23             : #include "nsError.h"
      24             : #include "NSSErrorsService.h"
      25             : #include "pk11pub.h"
      26             : #include "pkcs12.h"
      27             : #include "prerror.h"
      28             : #include "prio.h"
      29             : #include "sechash.h"
      30             : #include "secmod.h"
      31             : #include "secpkcs7.h"
      32             : #include "secport.h"
      33             : 
      34             : #ifndef MOZ_NO_MOZALLOC
      35             : #include "mozilla/mozalloc_oom.h"
      36             : #endif
      37             : 
      38             : namespace mozilla {
      39             : 
      40             : // NSPR APIs use PRStatus/PR_GetError and NSS APIs use SECStatus/PR_GetError to
      41             : // report success/failure. This function makes it more convenient and *safer*
      42             : // to translate NSPR/NSS results to nsresult. It is safer because it
      43             : // refuses to translate any bad PRStatus/SECStatus into an NS_OK, even when the
      44             : // NSPR/NSS function forgot to call PR_SetError. The actual enforcement of
      45             : // this happens in mozilla::psm::GetXPCOMFromNSSError.
      46             : // IMPORTANT: This must be called immediately after the function returning the
      47             : // SECStatus result. The recommended usage is:
      48             : //    nsresult rv = MapSECStatus(f(x, y, z));
      49             : inline nsresult
      50           1 : MapSECStatus(SECStatus rv)
      51             : {
      52           1 :   if (rv == SECSuccess) {
      53           1 :     return NS_OK;
      54             :   }
      55             : 
      56           0 :   return mozilla::psm::GetXPCOMFromNSSError(PR_GetError());
      57             : }
      58             : 
      59             : namespace internal {
      60             : 
      61             : inline void
      62           0 : PK11_DestroyContext_true(PK11Context * ctx) {
      63           0 :   PK11_DestroyContext(ctx, true);
      64           0 : }
      65             : 
      66             : } // namespace internal
      67             : 
      68             : // Emulates MOZ_TYPE_SPECIFIC_SCOPED_POINTER_TEMPLATE, but for UniquePtrs.
      69             : #define MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(name, Type, Deleter) \
      70             : struct name##DeletePolicy \
      71             : { \
      72             :   void operator()(Type* aValue) { Deleter(aValue); } \
      73             : }; \
      74             : typedef std::unique_ptr<Type, name##DeletePolicy> name;
      75             : 
      76           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePK11Context,
      77             :                                       PK11Context,
      78             :                                       internal::PK11_DestroyContext_true)
      79             : 
      80             : /** A more convenient way of dealing with digests calculated into
      81             :  *  stack-allocated buffers. NSS must be initialized on the main thread before
      82             :  *  use, and the caller must ensure NSS isn't shut down, typically by
      83             :  *  subclassing nsNSSShutDownObject, while Digest is in use.
      84             :  *
      85             :  * Typical usage, for digesting a buffer in memory:
      86             :  *
      87             :  *   nsCOMPtr<nsISupports> nssDummy = do_GetService("@mozilla.org/psm;1", &rv);
      88             :  *   Digest digest;
      89             :  *   nsresult rv = digest.DigestBuf(SEC_OID_SHA256, mybuffer, myBufferLen);
      90             :  *   NS_ENSURE_SUCCESS(rv, rv);
      91             :  *   rv = MapSECStatus(SomeNSSFunction(..., digest.get(), ...));
      92             :  *
      93             :  * Less typical usage, for digesting while doing streaming I/O and similar:
      94             :  *
      95             :  *   Digest digest;
      96             :  *   UniquePK11Context digestContext(PK11_CreateDigestContext(SEC_OID_SHA256));
      97             :  *   NS_ENSURE_TRUE(digestContext, NS_ERROR_OUT_OF_MEMORY);
      98             :  *   rv = MapSECStatus(PK11_DigestBegin(digestContext.get()));
      99             :  *   NS_ENSURE_SUCCESS(rv, rv);
     100             :  *   for (...) {
     101             :  *      rv = MapSECStatus(PK11_DigestOp(digestContext.get(), ...));
     102             :  *      NS_ENSURE_SUCCESS(rv, rv);
     103             :  *   }
     104             :  *   rv = digest.End(SEC_OID_SHA256, digestContext);
     105             :  *   NS_ENSURE_SUCCESS(rv, rv)
     106             :  */
     107             : class Digest
     108             : {
     109             : public:
     110           0 :   Digest()
     111           0 :   {
     112           0 :     mItem.type = siBuffer;
     113           0 :     mItem.data = mItemBuf;
     114           0 :     mItem.len = 0;
     115           0 :   }
     116             : 
     117           0 :   nsresult DigestBuf(SECOidTag hashAlg, const uint8_t * buf, uint32_t len)
     118             :   {
     119           0 :     if (len > static_cast<uint32_t>(std::numeric_limits<int32_t>::max())) {
     120           0 :       return NS_ERROR_INVALID_ARG;
     121             :     }
     122           0 :     nsresult rv = SetLength(hashAlg);
     123           0 :     NS_ENSURE_SUCCESS(rv, rv);
     124           0 :     return MapSECStatus(PK11_HashBuf(hashAlg, mItem.data, buf,
     125           0 :                                      static_cast<int32_t>(len)));
     126             :   }
     127             : 
     128           0 :   nsresult End(SECOidTag hashAlg, UniquePK11Context& context)
     129             :   {
     130           0 :     nsresult rv = SetLength(hashAlg);
     131           0 :     NS_ENSURE_SUCCESS(rv, rv);
     132             :     uint32_t len;
     133           0 :     rv = MapSECStatus(PK11_DigestFinal(context.get(), mItem.data, &len,
     134           0 :                                        mItem.len));
     135           0 :     NS_ENSURE_SUCCESS(rv, rv);
     136           0 :     context = nullptr;
     137           0 :     NS_ENSURE_TRUE(len == mItem.len, NS_ERROR_UNEXPECTED);
     138           0 :     return NS_OK;
     139             :   }
     140             : 
     141           0 :   const SECItem & get() const { return mItem; }
     142             : 
     143             : private:
     144           0 :   nsresult SetLength(SECOidTag hashType)
     145             :   {
     146             : #ifdef _MSC_VER
     147             : #pragma warning(push)
     148             :     // C4061: enumerator 'symbol' in switch of enum 'symbol' is not
     149             :     // explicitly handled.
     150             : #pragma warning(disable:4061)
     151             : #endif
     152           0 :     switch (hashType)
     153             :     {
     154           0 :       case SEC_OID_SHA1:   mItem.len = SHA1_LENGTH;   break;
     155           0 :       case SEC_OID_SHA256: mItem.len = SHA256_LENGTH; break;
     156           0 :       case SEC_OID_SHA384: mItem.len = SHA384_LENGTH; break;
     157           0 :       case SEC_OID_SHA512: mItem.len = SHA512_LENGTH; break;
     158             :       default:
     159           0 :         return NS_ERROR_INVALID_ARG;
     160             :     }
     161             : #ifdef _MSC_VER
     162             : #pragma warning(pop)
     163             : #endif
     164             : 
     165           0 :     return NS_OK;
     166             :   }
     167             : 
     168             :   uint8_t mItemBuf[HASH_LENGTH_MAX];
     169             :   SECItem mItem;
     170             : };
     171             : 
     172             : namespace internal {
     173             : 
     174             : inline void
     175           0 : PORT_FreeArena_false(PLArenaPool* arena)
     176             : {
     177             :   // PL_FreeArenaPool can't be used because it doesn't actually free the
     178             :   // memory, which doesn't work well with memory analysis tools.
     179           0 :   return PORT_FreeArena(arena, false);
     180             : }
     181             : 
     182             : } // namespace internal
     183             : 
     184             : // Wrapper around NSS's SECItem_AllocItem that handles OOM the same way as
     185             : // other allocators.
     186             : inline void
     187           0 : SECITEM_AllocItem(SECItem & item, uint32_t len)
     188             : {
     189           0 :   if (MOZ_UNLIKELY(!SECITEM_AllocItem(nullptr, &item, len))) {
     190             : #ifndef MOZ_NO_MOZALLOC
     191           0 :     mozalloc_handle_oom(len);
     192           0 :     if (MOZ_UNLIKELY(!SECITEM_AllocItem(nullptr, &item, len)))
     193             : #endif
     194             :     {
     195           0 :       MOZ_CRASH();
     196             :     }
     197             :   }
     198           0 : }
     199             : 
     200             : class ScopedAutoSECItem final : public SECItem
     201             : {
     202             : public:
     203          86 :   explicit ScopedAutoSECItem(uint32_t initialAllocatedLen = 0)
     204          86 :   {
     205          86 :     data = nullptr;
     206          86 :     len = 0;
     207          86 :     if (initialAllocatedLen > 0) {
     208           0 :       SECITEM_AllocItem(*this, initialAllocatedLen);
     209             :     }
     210          86 :   }
     211             : 
     212          86 :   void reset()
     213             :   {
     214          86 :     SECITEM_FreeItem(this, false);
     215          86 :   }
     216             : 
     217          86 :   ~ScopedAutoSECItem()
     218          86 :   {
     219          86 :     reset();
     220          86 :   }
     221             : };
     222             : 
     223             : class MOZ_RAII AutoSECMODListReadLock final
     224             : {
     225             : public:
     226           2 :   AutoSECMODListReadLock()
     227           2 :     : mLock(SECMOD_GetDefaultModuleListLock())
     228             :   {
     229           2 :     MOZ_ASSERT(mLock, "should have SECMOD lock (has NSS been initialized?)");
     230           2 :     SECMOD_GetReadLock(mLock);
     231           2 :   }
     232             : 
     233           2 :   ~AutoSECMODListReadLock()
     234           2 :   {
     235           2 :     SECMOD_ReleaseReadLock(mLock);
     236           2 :   }
     237             : 
     238             : private:
     239             :   SECMODListLock* mLock;
     240             : };
     241             : 
     242             : namespace internal {
     243             : 
     244           0 : inline void SECITEM_FreeItem_true(SECItem * s)
     245             : {
     246           0 :   return SECITEM_FreeItem(s, true);
     247             : }
     248             : 
     249           0 : inline void SECOID_DestroyAlgorithmID_true(SECAlgorithmID * a)
     250             : {
     251           0 :   return SECOID_DestroyAlgorithmID(a, true);
     252             : }
     253             : 
     254             : inline void SECKEYEncryptedPrivateKeyInfo_true(SECKEYEncryptedPrivateKeyInfo * epki)
     255             : {
     256             :   return SECKEY_DestroyEncryptedPrivateKeyInfo(epki, PR_TRUE);
     257             : }
     258             : 
     259           0 : inline void VFY_DestroyContext_true(VFYContext * ctx)
     260             : {
     261           0 :   VFY_DestroyContext(ctx, true);
     262           0 : }
     263             : 
     264             : } // namespace internal
     265             : 
     266          83 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTCertificate,
     267             :                                       CERTCertificate,
     268             :                                       CERT_DestroyCertificate)
     269           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTCertificateList,
     270             :                                       CERTCertificateList,
     271             :                                       CERT_DestroyCertificateList)
     272           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTCertificatePolicies,
     273             :                                       CERTCertificatePolicies,
     274             :                                       CERT_DestroyCertificatePoliciesExtension)
     275           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTCertificateRequest,
     276             :                                       CERTCertificateRequest,
     277             :                                       CERT_DestroyCertificateRequest)
     278           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTCertList,
     279             :                                       CERTCertList,
     280             :                                       CERT_DestroyCertList)
     281           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTName,
     282             :                                       CERTName,
     283             :                                       CERT_DestroyName)
     284           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTOidSequence,
     285             :                                       CERTOidSequence,
     286             :                                       CERT_DestroyOidSequence)
     287          11 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTSubjectPublicKeyInfo,
     288             :                                       CERTSubjectPublicKeyInfo,
     289             :                                       SECKEY_DestroySubjectPublicKeyInfo)
     290           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTUserNotice,
     291             :                                       CERTUserNotice,
     292             :                                       CERT_DestroyUserNotice)
     293           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueCERTValidity,
     294             :                                       CERTValidity,
     295             :                                       CERT_DestroyValidity)
     296             : 
     297          12 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueHASHContext,
     298             :                                       HASHContext,
     299             :                                       HASH_Destroy)
     300             : 
     301           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueNSSCMSMessage,
     302             :                                       NSSCMSMessage,
     303             :                                       NSS_CMSMessage_Destroy)
     304           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueNSSCMSSignedData,
     305             :                                       NSSCMSSignedData,
     306             :                                       NSS_CMSSignedData_Destroy)
     307             : 
     308           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePK11GenericObject,
     309             :                                       PK11GenericObject,
     310             :                                       PK11_DestroyGenericObject)
     311          12 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePK11SlotInfo,
     312             :                                       PK11SlotInfo,
     313             :                                       PK11_FreeSlot)
     314           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePK11SlotList,
     315             :                                       PK11SlotList,
     316             :                                       PK11_FreeSlotList)
     317           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePK11SymKey,
     318             :                                       PK11SymKey,
     319             :                                       PK11_FreeSymKey)
     320             : 
     321           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePLArenaPool,
     322             :                                       PLArenaPool,
     323             :                                       internal::PORT_FreeArena_false)
     324           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePORTString,
     325             :                                       char,
     326             :                                       PORT_Free)
     327           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePRFileDesc,
     328             :                                       PRFileDesc,
     329             :                                       PR_Close)
     330           1 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniquePRLibraryName,
     331             :                                       char,
     332             :                                       PR_FreeLibraryName)
     333             : 
     334           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueSECAlgorithmID,
     335             :                                       SECAlgorithmID,
     336             :                                       internal::SECOID_DestroyAlgorithmID_true)
     337           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueSECItem,
     338             :                                       SECItem,
     339             :                                       internal::SECITEM_FreeItem_true)
     340           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueSECKEYPrivateKey,
     341             :                                       SECKEYPrivateKey,
     342             :                                       SECKEY_DestroyPrivateKey)
     343           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueSECKEYPublicKey,
     344             :                                       SECKEYPublicKey,
     345             :                                       SECKEY_DestroyPublicKey)
     346           1 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueSECMODModule,
     347             :                                       SECMODModule,
     348             :                                       SECMOD_DestroyModule)
     349             : 
     350           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueSGNDigestInfo,
     351             :                                       SGNDigestInfo,
     352             :                                       SGN_DestroyDigestInfo)
     353             : 
     354           0 : MOZ_TYPE_SPECIFIC_UNIQUE_PTR_TEMPLATE(UniqueVFYContext,
     355             :                                       VFYContext,
     356             :                                       internal::VFY_DestroyContext_true)
     357             : } // namespace mozilla
     358             : 
     359             : #endif // ScopedNSSTypes_h

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