| /** @file | |
| Pkcs7Verify Driver to produce the UEFI PKCS7 Verification Protocol. | |
| The driver will produce the UEFI PKCS7 Verification Protocol which is used to | |
| verify data signed using PKCS7 structure. The PKCS7 data to be verified must | |
| be ASN.1 (DER) encoded. | |
| Copyright (c) 2015 - 2017, Intel Corporation. All rights reserved.<BR> | |
| This program and the accompanying materials | |
| are licensed and made available under the terms and conditions of the BSD License | |
| which accompanies this distribution. The full text of the license may be found at | |
| http://opensource.org/licenses/bsd-license.php | |
| THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
| WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
| **/ | |
| #include <Library/BaseLib.h> | |
| #include <Library/BaseMemoryLib.h> | |
| #include <Library/MemoryAllocationLib.h> | |
| #include <Library/UefiBootServicesTableLib.h> | |
| #include <Library/BaseCryptLib.h> | |
| #include <Protocol/Pkcs7Verify.h> | |
| #define MAX_DIGEST_SIZE SHA512_DIGEST_SIZE | |
| /** | |
| Calculates the hash of the given data based on the specified hash GUID. | |
| @param[in] Data Pointer to the data buffer to be hashed. | |
| @param[in] DataSize The size of data buffer in bytes. | |
| @param[in] CertGuid The GUID to identify the hash algorithm to be used. | |
| @param[out] HashValue Pointer to a buffer that receives the hash result. | |
| @retval TRUE Data hash calculation succeeded. | |
| @retval FALSE Data hash calculation failed. | |
| **/ | |
| BOOLEAN | |
| CalculateDataHash ( | |
| IN VOID *Data, | |
| IN UINTN DataSize, | |
| IN EFI_GUID *CertGuid, | |
| OUT UINT8 *HashValue | |
| ) | |
| { | |
| BOOLEAN Status; | |
| VOID *HashCtx; | |
| UINTN CtxSize; | |
| Status = FALSE; | |
| HashCtx = NULL; | |
| if (CompareGuid (CertGuid, &gEfiCertSha1Guid)) { | |
| // | |
| // SHA-1 Hash | |
| // | |
| CtxSize = Sha1GetContextSize (); | |
| HashCtx = AllocatePool (CtxSize); | |
| if (HashCtx == NULL) { | |
| goto _Exit; | |
| } | |
| Status = Sha1Init (HashCtx); | |
| Status = Sha1Update (HashCtx, Data, DataSize); | |
| Status = Sha1Final (HashCtx, HashValue); | |
| } else if (CompareGuid (CertGuid, &gEfiCertSha256Guid)) { | |
| // | |
| // SHA256 Hash | |
| // | |
| CtxSize = Sha256GetContextSize (); | |
| HashCtx = AllocatePool (CtxSize); | |
| if (HashCtx == NULL) { | |
| goto _Exit; | |
| } | |
| Status = Sha256Init (HashCtx); | |
| Status = Sha256Update (HashCtx, Data, DataSize); | |
| Status = Sha256Final (HashCtx, HashValue); | |
| } else if (CompareGuid (CertGuid, &gEfiCertSha384Guid)) { | |
| // | |
| // SHA384 Hash | |
| // | |
| CtxSize = Sha384GetContextSize (); | |
| HashCtx = AllocatePool (CtxSize); | |
| if (HashCtx == NULL) { | |
| goto _Exit; | |
| } | |
| Status = Sha384Init (HashCtx); | |
| Status = Sha384Update (HashCtx, Data, DataSize); | |
| Status = Sha384Final (HashCtx, HashValue); | |
| } else if (CompareGuid (CertGuid, &gEfiCertSha512Guid)) { | |
| // | |
| // SHA512 Hash | |
| // | |
| CtxSize = Sha512GetContextSize (); | |
| HashCtx = AllocatePool (CtxSize); | |
| if (HashCtx == NULL) { | |
| goto _Exit; | |
| } | |
| Status = Sha512Init (HashCtx); | |
| Status = Sha512Update (HashCtx, Data, DataSize); | |
| Status = Sha512Final (HashCtx, HashValue); | |
| } | |
| _Exit: | |
| if (HashCtx != NULL) { | |
| FreePool (HashCtx); | |
| } | |
| return Status; | |
| } | |
| /** | |
| Check whether the hash of data content is revoked by the revocation database. | |
| @param[in] Hash Pointer to the hash that is searched for. | |
| @param[in] HashSize The size of the hash in bytes. | |
| @param[in] RevokedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structure which contains list of X.509 certificates | |
| of revoked signers and revoked content hashes. | |
| @return TRUE The matched content hash is found in the revocation database. | |
| @return FALSE The matched content hash is not found in the revocation database. | |
| **/ | |
| BOOLEAN | |
| IsContentHashRevokedByHash ( | |
| IN UINT8 *Hash, | |
| IN UINTN HashSize, | |
| IN EFI_SIGNATURE_LIST **RevokedDb | |
| ) | |
| { | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINTN Index; | |
| UINTN EntryIndex; | |
| UINTN EntryCount; | |
| BOOLEAN Status; | |
| if (RevokedDb == NULL) { | |
| return FALSE; | |
| } | |
| Status = FALSE; | |
| // | |
| // Check if any hash matching content hash can be found in RevokedDB | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(RevokedDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Search the signature database to search the revoked content hash | |
| // | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| EntryCount = (SigList->SignatureListSize - SigList->SignatureHeaderSize - | |
| sizeof (EFI_SIGNATURE_LIST)) / SigList->SignatureSize; | |
| for (EntryIndex = 0; EntryIndex < EntryCount; EntryIndex++) { | |
| // | |
| // The problem case. There's a revocation hash but the sizes | |
| // don't match, meaning it's a different hash algorithm and we | |
| // can't tell if it's revoking our binary or not. Assume not. | |
| // | |
| if (SigList->SignatureSize - sizeof(EFI_GUID) == HashSize) { | |
| // | |
| // Compare Data Hash with Signature Data | |
| // | |
| if (CompareMem (SigData->SignatureData, Hash, HashSize) == 0) { | |
| Status = TRUE; | |
| goto _Exit; | |
| } | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigData + SigList->SignatureSize); | |
| } | |
| } | |
| _Exit: | |
| return Status; | |
| } | |
| /** | |
| Check whether the hash of data content is revoked by the revocation database. | |
| @param[in] Content Pointer to the content buffer that is searched for. | |
| @param[in] ContentSize The size of data content in bytes. | |
| @param[in] RevokedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structure which contains list of X.509 certificates | |
| of revoked signers and revoked content hashes. | |
| @return TRUE The matched content hash is found in the revocation database. | |
| @return FALSE The matched content hash is not found in the revocation database. | |
| **/ | |
| BOOLEAN | |
| IsContentHashRevoked ( | |
| IN UINT8 *Content, | |
| IN UINTN ContentSize, | |
| IN EFI_SIGNATURE_LIST **RevokedDb | |
| ) | |
| { | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINTN Index; | |
| UINT8 HashVal[MAX_DIGEST_SIZE]; | |
| UINTN EntryIndex; | |
| UINTN EntryCount; | |
| BOOLEAN Status; | |
| if (RevokedDb == NULL) { | |
| return FALSE; | |
| } | |
| Status = FALSE; | |
| // | |
| // Check if any hash matching content hash can be found in RevokedDB | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(RevokedDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Calculate the digest of supplied data based on the signature hash type. | |
| // | |
| if (!CalculateDataHash (Content, ContentSize, &SigList->SignatureType, HashVal)) { | |
| // | |
| // Un-matched Hash GUID or other failure. | |
| // | |
| continue; | |
| } | |
| // | |
| // Search the signature database to search the revoked content hash | |
| // | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| EntryCount = (SigList->SignatureListSize - SigList->SignatureHeaderSize - | |
| sizeof (EFI_SIGNATURE_LIST)) / SigList->SignatureSize; | |
| for (EntryIndex = 0; EntryIndex < EntryCount; EntryIndex++) { | |
| // | |
| // Compare Data Hash with Signature Data | |
| // | |
| if (CompareMem (SigData->SignatureData, HashVal, (SigList->SignatureSize - sizeof (EFI_GUID))) == 0) { | |
| Status = TRUE; | |
| goto _Exit; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigData + SigList->SignatureSize); | |
| } | |
| } | |
| _Exit: | |
| return Status; | |
| } | |
| /** | |
| Check whether the hash of an given certificate is revoked by the revocation database. | |
| @param[in] Certificate Pointer to the certificate that is searched for. | |
| @param[in] CertSize Size of certificate in bytes. | |
| @param[in] RevokedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures which contains list of X.509 certificate | |
| of revoked signers and revoked content hashes. | |
| @param[out] RevocationTime Return the time that the certificate was revoked. | |
| @return TRUE The certificate hash is found in the revocation database. | |
| @return FALSE The certificate hash is not found in the revocation database. | |
| **/ | |
| BOOLEAN | |
| IsCertHashRevoked ( | |
| IN UINT8 *Certificate, | |
| IN UINTN CertSize, | |
| IN EFI_SIGNATURE_LIST **RevokedDb, | |
| OUT EFI_TIME *RevocationTime | |
| ) | |
| { | |
| BOOLEAN Status; | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINT8 *TBSCert; | |
| UINTN TBSCertSize; | |
| UINTN Index; | |
| UINTN EntryIndex; | |
| UINTN EntryCount; | |
| UINT8 CertHashVal[MAX_DIGEST_SIZE]; | |
| if ((RevocationTime == NULL) || (RevokedDb == NULL)) { | |
| return FALSE; | |
| } | |
| // | |
| // Retrieve the TBSCertificate from the X.509 Certificate for hash calculation | |
| // | |
| if (!X509GetTBSCert (Certificate, CertSize, &TBSCert, &TBSCertSize)) { | |
| return FALSE; | |
| } | |
| Status = FALSE; | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(RevokedDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Determine Hash Algorithm based on the entry type in revocation database, and | |
| // calculate the certificate hash. | |
| // | |
| if (CompareGuid (&SigList->SignatureType, &gEfiCertX509Sha256Guid)) { | |
| Status = CalculateDataHash (TBSCert, TBSCertSize, &gEfiCertSha256Guid, CertHashVal); | |
| } else if (CompareGuid (&SigList->SignatureType, &gEfiCertX509Sha384Guid)) { | |
| Status = CalculateDataHash (TBSCert, TBSCertSize, &gEfiCertSha384Guid, CertHashVal); | |
| } else if (CompareGuid (&SigList->SignatureType, &gEfiCertX509Sha512Guid)) { | |
| Status = CalculateDataHash (TBSCert, TBSCertSize, &gEfiCertSha512Guid, CertHashVal); | |
| } else { | |
| // | |
| // Un-matched Cert Hash GUID | |
| // | |
| continue; | |
| } | |
| if (!Status) { | |
| continue; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| EntryCount = (SigList->SignatureListSize - SigList->SignatureHeaderSize - | |
| sizeof (EFI_SIGNATURE_LIST)) / SigList->SignatureSize; | |
| for (EntryIndex = 0; EntryIndex < EntryCount; Index++) { | |
| // | |
| // Check if the Certificate Hash is revoked. | |
| // | |
| if (CompareMem (SigData->SignatureData, CertHashVal, | |
| SigList->SignatureSize - sizeof (EFI_GUID) - sizeof (EFI_TIME)) == 0) { | |
| Status = TRUE; | |
| // | |
| // Return the revocation time of this revoked certificate. | |
| // | |
| CopyMem ( | |
| RevocationTime, | |
| (EFI_TIME *)((UINT8 *)SigData + SigList->SignatureSize - sizeof (EFI_TIME)), | |
| sizeof (EFI_TIME) | |
| ); | |
| goto _Exit; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigData + SigList->SignatureSize); | |
| } | |
| } | |
| _Exit: | |
| return Status; | |
| } | |
| /** | |
| Check if the given time value is zero. | |
| @param[in] Time Pointer of a time value. | |
| @retval TRUE The Time is Zero. | |
| @retval FALSE The Time is not Zero. | |
| **/ | |
| BOOLEAN | |
| IsTimeZero ( | |
| IN EFI_TIME *Time | |
| ) | |
| { | |
| if ((Time->Year == 0) && (Time->Month == 0) && (Time->Day == 0) && | |
| (Time->Hour == 0) && (Time->Minute == 0) && (Time->Second == 0)) { | |
| return TRUE; | |
| } | |
| return FALSE; | |
| } | |
| /** | |
| Check whether the timestamp is valid by comparing the signing time and the revocation time. | |
| @param SigningTime Pointer to the signing time. | |
| @param RevocationTime Pointer to the revocation time. | |
| @retval TRUE The SigningTime is not later than the RevocationTime. | |
| @retval FALSE The SigningTime is later than the RevocationTime. | |
| **/ | |
| BOOLEAN | |
| CompareTimestamp ( | |
| IN EFI_TIME *SigningTime, | |
| IN EFI_TIME *RevocationTime | |
| ) | |
| { | |
| if (SigningTime->Year != RevocationTime->Year) { | |
| return (BOOLEAN) (SigningTime->Year < RevocationTime->Year); | |
| } else if (SigningTime->Month != RevocationTime->Month) { | |
| return (BOOLEAN) (SigningTime->Month < RevocationTime->Month); | |
| } else if (SigningTime->Day != RevocationTime->Day) { | |
| return (BOOLEAN) (SigningTime->Day < RevocationTime->Day); | |
| } else if (SigningTime->Hour != RevocationTime->Hour) { | |
| return (BOOLEAN) (SigningTime->Hour < RevocationTime->Hour); | |
| } else if (SigningTime->Minute != RevocationTime->Minute) { | |
| return (BOOLEAN) (SigningTime->Minute < RevocationTime->Minute); | |
| } | |
| return (BOOLEAN) (SigningTime->Second <= RevocationTime->Second); | |
| } | |
| /** | |
| Check whether the timestamp signature embedded in PKCS7 signedData is valid and | |
| the signing time is also earlier than the revocation time. | |
| @param[in] SignedData Pointer to the PKCS#7 signedData. | |
| @param[in] SignedDataSize Size of SignedData in bytes. | |
| @param[in] TimeStampDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures which is used to pass a list of X.509 | |
| certificates of trusted timestamp signers. | |
| @param[in] RevocationTime The time that the certificate was revoked. | |
| @retval TRUE Timestamp signature is valid and the signing time is no later | |
| than the revocation time. | |
| @retval FALSE Timestamp signature is not valid or the signing time is later | |
| than the revocation time. | |
| **/ | |
| BOOLEAN | |
| IsValidTimestamp ( | |
| IN UINT8 *SignedData, | |
| IN UINTN SignedDataSize, | |
| IN EFI_SIGNATURE_LIST **TimeStampDb, | |
| IN EFI_TIME *RevocationTime | |
| ) | |
| { | |
| BOOLEAN Status; | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINT8 *TsaCert; | |
| UINTN TsaCertSize; | |
| UINTN Index; | |
| EFI_TIME SigningTime; | |
| // | |
| // If no supplied database for verification or RevocationTime is zero, | |
| // the certificate shall be considered to always be revoked. | |
| // | |
| if ((TimeStampDb == NULL) || (IsTimeZero (RevocationTime))) { | |
| return FALSE; | |
| } | |
| Status = FALSE; | |
| // | |
| // RevocationTime is non-zero, the certificate should be considered to be revoked | |
| // from that time and onwards. | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *) (TimeStampDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Ignore any non-X509-format entry in the list | |
| // | |
| if (!CompareGuid (&SigList->SignatureType, &gEfiCertX509Guid)) { | |
| continue; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| TsaCert = SigData->SignatureData; | |
| TsaCertSize = SigList->SignatureSize - sizeof (EFI_GUID); | |
| // | |
| // Each TSA Certificate will normally be in a seperate EFI_SIGNATURE_LIST | |
| // Leverage ImageTimestampVerify interface for Timestamp counterSignature Verification | |
| // | |
| if (ImageTimestampVerify (SignedData, SignedDataSize, TsaCert, TsaCertSize, &SigningTime)) { | |
| // | |
| // The signer signature is valid only when the signing time is earlier than revocation time. | |
| // | |
| if (CompareTimestamp (&SigningTime, RevocationTime)) { | |
| Status = TRUE; | |
| break; | |
| } | |
| } | |
| } | |
| return Status; | |
| } | |
| /** | |
| Check whether the PKCS7 signedData is revoked by verifying with the revoked | |
| certificates database, and if the signedData is timestamped, the embedded timestamp | |
| couterSignature will be checked with the supplied timestamp database. | |
| @param[in] SignedData Pointer to buffer containing ASN.1 DER-encoded PKCS7 | |
| signature. | |
| @param[in] SignedDataSize The size of SignedData buffer in bytes. | |
| @param[in] InHash Pointer to the buffer containing the hash of the mesage data | |
| previously signed and to be verified. | |
| @param[in] InHashSize The size of InHash buffer in bytes. | |
| @param[in] RevokedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structure which contains list of X.509 certificates | |
| of revoked signers and revoked content hashes. | |
| @param[in] TimeStampDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures which is used to pass a list of X.509 | |
| certificates of trusted timestamp signers. | |
| @retval EFI_SUCCESS The PKCS7 signedData is revoked. | |
| @retval EFI_SECURITY_VIOLATION Fail to verify the signature in PKCS7 signedData. | |
| @retval EFI_INVALID_PARAMETER SignedData is NULL or SignedDataSize is zero. | |
| AllowedDb is NULL. | |
| Content is not NULL and ContentSize is NULL. | |
| @retval EFI_NOT_FOUND Content not found because InData is NULL and no | |
| content embedded in PKCS7 signedData. | |
| @retval EFI_UNSUPPORTED The PKCS7 signedData was not correctly formatted. | |
| **/ | |
| EFI_STATUS | |
| P7CheckRevocationByHash ( | |
| IN UINT8 *SignedData, | |
| IN UINTN SignedDataSize, | |
| IN UINT8 *InHash, | |
| IN UINTN InHashSize, | |
| IN EFI_SIGNATURE_LIST **RevokedDb, | |
| IN EFI_SIGNATURE_LIST **TimeStampDb | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINT8 *RevokedCert; | |
| UINTN RevokedCertSize; | |
| UINTN Index; | |
| UINT8 *CertBuffer; | |
| UINTN BufferLength; | |
| UINT8 *TrustedCert; | |
| UINTN TrustedCertLength; | |
| UINT8 CertNumber; | |
| UINT8 *CertPtr; | |
| UINT8 *Cert; | |
| UINTN CertSize; | |
| EFI_TIME RevocationTime; | |
| Status = EFI_SECURITY_VIOLATION; | |
| SigData = NULL; | |
| RevokedCert = NULL; | |
| RevokedCertSize = 0; | |
| CertBuffer = NULL; | |
| TrustedCert = NULL; | |
| // | |
| // The signedData is revoked if the hash of content existed in RevokedDb | |
| // | |
| if (IsContentHashRevokedByHash (InHash, InHashSize, RevokedDb)) { | |
| Status = EFI_SUCCESS; | |
| goto _Exit; | |
| } | |
| // | |
| // Check if the signer's certificate can be found in Revoked database | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(RevokedDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Ignore any non-X509-format entry in the list. | |
| // | |
| if (!CompareGuid (&SigList->SignatureType, &gEfiCertX509Guid)) { | |
| continue; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| RevokedCert = SigData->SignatureData; | |
| RevokedCertSize = SigList->SignatureSize - sizeof (EFI_GUID); | |
| // | |
| // Verifying the PKCS#7 SignedData with the revoked certificate in RevokedDb | |
| // | |
| if (AuthenticodeVerify (SignedData, SignedDataSize, RevokedCert, RevokedCertSize, InHash, InHashSize)) { | |
| // | |
| // The signedData was verified by one entry in Revoked Database | |
| // | |
| Status = EFI_SUCCESS; | |
| break; | |
| } | |
| } | |
| if (!EFI_ERROR (Status)) { | |
| // | |
| // The signedData was revoked, since it was hit by RevokedDb | |
| // | |
| goto _Exit; | |
| } | |
| // | |
| // Now we will continue to check the X.509 Certificate Hash & Possible Timestamp | |
| // | |
| if ((TimeStampDb == NULL) || (*TimeStampDb == NULL)) { | |
| goto _Exit; | |
| } | |
| Pkcs7GetSigners (SignedData, SignedDataSize, &CertBuffer, &BufferLength, &TrustedCert, &TrustedCertLength); | |
| if ((BufferLength == 0) || (CertBuffer == NULL)) { | |
| Status = EFI_SUCCESS; | |
| goto _Exit; | |
| } | |
| // | |
| // Check if any hash of certificates embedded in P7 data is in the revoked database. | |
| // | |
| CertNumber = (UINT8) (*CertBuffer); | |
| CertPtr = CertBuffer + 1; | |
| for (Index = 0; Index < CertNumber; Index++) { | |
| // | |
| // Retrieve the Certificate data | |
| // | |
| CertSize = (UINTN) ReadUnaligned32 ((UINT32 *) CertPtr); | |
| Cert = (UINT8 *)CertPtr + sizeof (UINT32); | |
| if (IsCertHashRevoked (Cert, CertSize, RevokedDb, &RevocationTime)) { | |
| // | |
| // Check the timestamp signature and signing time to determine if p7 data can be trusted. | |
| // | |
| Status = EFI_SUCCESS; | |
| if (IsValidTimestamp (SignedData, SignedDataSize, TimeStampDb, &RevocationTime)) { | |
| // | |
| // Use EFI_NOT_READY to identify the P7Data is not reovked, because the timestamping | |
| // occured prior to the time of certificate revocation. | |
| // | |
| Status = EFI_NOT_READY; | |
| } | |
| goto _Exit; | |
| } | |
| CertPtr = CertPtr + sizeof (UINT32) + CertSize; | |
| } | |
| _Exit: | |
| Pkcs7FreeSigners (CertBuffer); | |
| Pkcs7FreeSigners (TrustedCert); | |
| return Status; | |
| } | |
| /** | |
| Check whether the PKCS7 signedData is revoked by verifying with the revoked | |
| certificates database, and if the signedData is timestamped, the embedded timestamp | |
| couterSignature will be checked with the supplied timestamp database. | |
| @param[in] SignedData Pointer to buffer containing ASN.1 DER-encoded PKCS7 | |
| signature. | |
| @param[in] SignedDataSize The size of SignedData buffer in bytes. | |
| @param[in] InData Pointer to the buffer containing the raw message data | |
| previously signed and to be verified. | |
| @param[in] InDataSize The size of InData buffer in bytes. | |
| @param[in] RevokedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structure which contains list of X.509 certificates | |
| of revoked signers and revoked content hashes. | |
| @param[in] TimeStampDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures which is used to pass a list of X.509 | |
| certificates of trusted timestamp signers. | |
| @retval EFI_SUCCESS The PKCS7 signedData is revoked. | |
| @retval EFI_SECURITY_VIOLATION Fail to verify the signature in PKCS7 signedData. | |
| @retval EFI_INVALID_PARAMETER SignedData is NULL or SignedDataSize is zero. | |
| AllowedDb is NULL. | |
| Content is not NULL and ContentSize is NULL. | |
| @retval EFI_NOT_FOUND Content not found because InData is NULL and no | |
| content embedded in PKCS7 signedData. | |
| @retval EFI_UNSUPPORTED The PKCS7 signedData was not correctly formatted. | |
| **/ | |
| EFI_STATUS | |
| P7CheckRevocation ( | |
| IN UINT8 *SignedData, | |
| IN UINTN SignedDataSize, | |
| IN UINT8 *InData, | |
| IN UINTN InDataSize, | |
| IN EFI_SIGNATURE_LIST **RevokedDb, | |
| IN EFI_SIGNATURE_LIST **TimeStampDb | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINT8 *RevokedCert; | |
| UINTN RevokedCertSize; | |
| UINTN Index; | |
| UINT8 *CertBuffer; | |
| UINTN BufferLength; | |
| UINT8 *TrustedCert; | |
| UINTN TrustedCertLength; | |
| UINT8 CertNumber; | |
| UINT8 *CertPtr; | |
| UINT8 *Cert; | |
| UINTN CertSize; | |
| EFI_TIME RevocationTime; | |
| Status = EFI_UNSUPPORTED; | |
| SigData = NULL; | |
| RevokedCert = NULL; | |
| RevokedCertSize = 0; | |
| CertBuffer = NULL; | |
| TrustedCert = NULL; | |
| // | |
| // The signedData is revoked if the hash of content existed in RevokedDb | |
| // | |
| if (IsContentHashRevoked (InData, InDataSize, RevokedDb)) { | |
| Status = EFI_SUCCESS; | |
| goto _Exit; | |
| } | |
| // | |
| // Check if the signer's certificate can be found in Revoked database | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(RevokedDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Ignore any non-X509-format entry in the list. | |
| // | |
| if (!CompareGuid (&SigList->SignatureType, &gEfiCertX509Guid)) { | |
| continue; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| RevokedCert = SigData->SignatureData; | |
| RevokedCertSize = SigList->SignatureSize - sizeof (EFI_GUID); | |
| // | |
| // Verifying the PKCS#7 SignedData with the revoked certificate in RevokedDb | |
| // | |
| if (Pkcs7Verify (SignedData, SignedDataSize, RevokedCert, RevokedCertSize, InData, InDataSize)) { | |
| // | |
| // The signedData was verified by one entry in Revoked Database | |
| // | |
| Status = EFI_SUCCESS; | |
| break; | |
| } | |
| } | |
| if (!EFI_ERROR (Status)) { | |
| // | |
| // The signedData was revoked, since it was hit by RevokedDb | |
| // | |
| goto _Exit; | |
| } | |
| // | |
| // Now we will continue to check the X.509 Certificate Hash & Possible Timestamp | |
| // | |
| if ((TimeStampDb == NULL) || (*TimeStampDb == NULL)) { | |
| goto _Exit; | |
| } | |
| Pkcs7GetSigners (SignedData, SignedDataSize, &CertBuffer, &BufferLength, &TrustedCert, &TrustedCertLength); | |
| if ((BufferLength == 0) || (CertBuffer == NULL)) { | |
| Status = EFI_SUCCESS; | |
| goto _Exit; | |
| } | |
| // | |
| // Check if any hash of certificates embedded in P7 data is in the revoked database. | |
| // | |
| CertNumber = (UINT8) (*CertBuffer); | |
| CertPtr = CertBuffer + 1; | |
| for (Index = 0; Index < CertNumber; Index++) { | |
| // | |
| // Retrieve the Certificate data | |
| // | |
| CertSize = (UINTN) ReadUnaligned32 ((UINT32 *) CertPtr); | |
| Cert = (UINT8 *)CertPtr + sizeof (UINT32); | |
| if (IsCertHashRevoked (Cert, CertSize, RevokedDb, &RevocationTime)) { | |
| // | |
| // Check the timestamp signature and signing time to determine if p7 data can be trusted. | |
| // | |
| Status = EFI_SUCCESS; | |
| if (IsValidTimestamp (SignedData, SignedDataSize, TimeStampDb, &RevocationTime)) { | |
| // | |
| // Use EFI_NOT_READY to identify the P7Data is not reovked, because the timestamping | |
| // occured prior to the time of certificate revocation. | |
| // | |
| Status = EFI_NOT_READY; | |
| } | |
| goto _Exit; | |
| } | |
| CertPtr = CertPtr + sizeof (UINT32) + CertSize; | |
| } | |
| _Exit: | |
| Pkcs7FreeSigners (CertBuffer); | |
| Pkcs7FreeSigners (TrustedCert); | |
| return Status; | |
| } | |
| /** | |
| Check whether the PKCS7 signedData can be verified by the trusted certificates | |
| database, and return the content of the signedData if requested. | |
| @param[in] SignedData Pointer to buffer containing ASN.1 DER-encoded PKCS7 | |
| signature. | |
| @param[in] SignedDataSize The size of SignedData buffer in bytes. | |
| @param[in] InHash Pointer to the buffer containing the hash of the message data | |
| previously signed and to be verified. | |
| @param[in] InHashSize The size of InHash buffer in bytes. | |
| @param[in] AllowedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures which contains lists of X.509 certificates | |
| of approved signers. | |
| @retval EFI_SUCCESS The PKCS7 signedData is trusted. | |
| @retval EFI_SECURITY_VIOLATION Fail to verify the signature in PKCS7 signedData. | |
| @retval EFI_INVALID_PARAMETER SignedData is NULL or SignedDataSize is zero. | |
| AllowedDb is NULL. | |
| Content is not NULL and ContentSize is NULL. | |
| @retval EFI_NOT_FOUND Content not found because InData is NULL and no | |
| content embedded in PKCS7 signedData. | |
| @retval EFI_UNSUPPORTED The PKCS7 signedData was not correctly formatted. | |
| @retval EFI_BUFFER_TOO_SMALL The size of buffer indicated by ContentSize is too | |
| small to hold the content. ContentSize updated to | |
| the required size. | |
| **/ | |
| EFI_STATUS | |
| P7CheckTrustByHash ( | |
| IN UINT8 *SignedData, | |
| IN UINTN SignedDataSize, | |
| IN UINT8 *InHash, | |
| IN UINTN InHashSize, | |
| IN EFI_SIGNATURE_LIST **AllowedDb | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINT8 *TrustCert; | |
| UINTN TrustCertSize; | |
| UINTN Index; | |
| Status = EFI_SECURITY_VIOLATION; | |
| SigData = NULL; | |
| TrustCert = NULL; | |
| TrustCertSize = 0; | |
| if (AllowedDb == NULL) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // Build Certificate Stack with all valid X509 certificates in the supplied | |
| // Signature List for PKCS7 Verification. | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(AllowedDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Ignore any non-X509-format entry in the list. | |
| // | |
| if (!CompareGuid (&SigList->SignatureType, &gEfiCertX509Guid)) { | |
| continue; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| TrustCert = SigData->SignatureData; | |
| TrustCertSize = SigList->SignatureSize - sizeof (EFI_GUID); | |
| // | |
| // Verifying the PKCS#7 SignedData with the trusted certificate from AllowedDb | |
| // | |
| if (AuthenticodeVerify (SignedData, SignedDataSize, TrustCert, TrustCertSize, InHash, InHashSize)) { | |
| // | |
| // The SignedData was verified successfully by one entry in Trusted Database | |
| // | |
| Status = EFI_SUCCESS; | |
| break; | |
| } | |
| } | |
| return Status; | |
| } | |
| /** | |
| Check whether the PKCS7 signedData can be verified by the trusted certificates | |
| database, and return the content of the signedData if requested. | |
| @param[in] SignedData Pointer to buffer containing ASN.1 DER-encoded PKCS7 | |
| signature. | |
| @param[in] SignedDataSize The size of SignedData buffer in bytes. | |
| @param[in] InData Pointer to the buffer containing the raw message data | |
| previously signed and to be verified. | |
| @param[in] InDataSize The size of InData buffer in bytes. | |
| @param[in] AllowedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures which contains lists of X.509 certificates | |
| of approved signers. | |
| @retval EFI_SUCCESS The PKCS7 signedData is trusted. | |
| @retval EFI_SECURITY_VIOLATION Fail to verify the signature in PKCS7 signedData. | |
| @retval EFI_INVALID_PARAMETER SignedData is NULL or SignedDataSize is zero. | |
| AllowedDb is NULL. | |
| Content is not NULL and ContentSize is NULL. | |
| @retval EFI_NOT_FOUND Content not found because InData is NULL and no | |
| content embedded in PKCS7 signedData. | |
| @retval EFI_UNSUPPORTED The PKCS7 signedData was not correctly formatted. | |
| @retval EFI_BUFFER_TOO_SMALL The size of buffer indicated by ContentSize is too | |
| small to hold the content. ContentSize updated to | |
| the required size. | |
| **/ | |
| EFI_STATUS | |
| P7CheckTrust ( | |
| IN UINT8 *SignedData, | |
| IN UINTN SignedDataSize, | |
| IN UINT8 *InData, | |
| IN UINTN InDataSize, | |
| IN EFI_SIGNATURE_LIST **AllowedDb | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SIGNATURE_LIST *SigList; | |
| EFI_SIGNATURE_DATA *SigData; | |
| UINT8 *TrustCert; | |
| UINTN TrustCertSize; | |
| UINTN Index; | |
| Status = EFI_SECURITY_VIOLATION; | |
| SigData = NULL; | |
| TrustCert = NULL; | |
| TrustCertSize = 0; | |
| if (AllowedDb == NULL) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // Build Certificate Stack with all valid X509 certificates in the supplied | |
| // Signature List for PKCS7 Verification. | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(AllowedDb[Index]); | |
| // | |
| // The list is terminated by a NULL pointer. | |
| // | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| // | |
| // Ignore any non-X509-format entry in the list. | |
| // | |
| if (!CompareGuid (&SigList->SignatureType, &gEfiCertX509Guid)) { | |
| continue; | |
| } | |
| SigData = (EFI_SIGNATURE_DATA *) ((UINT8 *) SigList + sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize); | |
| TrustCert = SigData->SignatureData; | |
| TrustCertSize = SigList->SignatureSize - sizeof (EFI_GUID); | |
| // | |
| // Verifying the PKCS#7 SignedData with the trusted certificate from AllowedDb | |
| // | |
| if (Pkcs7Verify (SignedData, SignedDataSize, TrustCert, TrustCertSize, InData, InDataSize)) { | |
| // | |
| // The SignedData was verified successfully by one entry in Trusted Database | |
| // | |
| Status = EFI_SUCCESS; | |
| break; | |
| } | |
| } | |
| return Status; | |
| } | |
| /** | |
| Processes a buffer containing binary DER-encoded PKCS7 signature. | |
| The signed data content may be embedded within the buffer or separated. Function | |
| verifies the signature of the content is valid and signing certificate was not | |
| revoked and is contained within a list of trusted signers. | |
| @param[in] This Pointer to EFI_PKCS7_VERIFY_PROTOCOL instance. | |
| @param[in] SignedData Points to buffer containing ASN.1 DER-encoded PKCS7 | |
| signature. | |
| @param[in] SignedDataSize The size of SignedData buffer in bytes. | |
| @param[in] InData In case of detached signature, InData points to | |
| buffer containing the raw message data previously | |
| signed and to be verified by function. In case of | |
| SignedData containing embedded data, InData must be | |
| NULL. | |
| @param[in] InDataSize When InData is used, the size of InData buffer in | |
| bytes. When InData is NULL. This parameter must be | |
| 0. | |
| @param[in] AllowedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures. The list is terminated by a null | |
| pointer. The EFI_SIGNATURE_LIST structures contain | |
| lists of X.509 certificates of approved signers. | |
| Function recognizes signer certificates of type | |
| EFI_CERT_X509_GUID. Any hash certificate in AllowedDb | |
| list is ignored by this function. Function returns | |
| success if signer of the buffer is within this list | |
| (and not within RevokedDb). This parameter is | |
| required. | |
| @param[in] RevokedDb Optional pointer to a list of pointers to | |
| EFI_SIGNATURE_LIST structures. The list is terminated | |
| by a null pointer. List of X.509 certificates of | |
| revoked signers and revoked file hashes. Except as | |
| noted in description of TimeStampDb signature | |
| verification will always fail if the signer of the | |
| file or the hash of the data component of the buffer | |
| is in RevokedDb list. This list is optional and | |
| caller may pass Null or pointer to NULL if not | |
| required. | |
| @param[in] TimeStampDb Optional pointer to a list of pointers to | |
| EFI_SIGNATURE_LIST structures. The list is terminated | |
| by a null pointer. This parameter can be used to pass | |
| a list of X.509 certificates of trusted time stamp | |
| signers. This list is optional and caller must pass | |
| Null or pointer to NULL if not required. | |
| @param[out] Content On input, points to an optional caller-allocated | |
| buffer into which the function will copy the content | |
| portion of the file after verification succeeds. | |
| This parameter is optional and if NULL, no copy of | |
| content from file is performed. | |
| @param[in,out] ContentSize On input, points to the size in bytes of the optional | |
| buffer Content previously allocated by caller. On | |
| output, if the verification succeeds, the value | |
| referenced by ContentSize will contain the actual | |
| size of the content from signed file. If ContentSize | |
| indicates the caller-allocated buffer is too small | |
| to contain content, an error is returned, and | |
| ContentSize will be updated with the required size. | |
| This parameter must be 0 if Content is Null. | |
| @retval EFI_SUCCESS Content signature was verified against hash of | |
| content, the signer's certificate was not found in | |
| RevokedDb, and was found in AllowedDb or if in signer | |
| is found in both AllowedDb and RevokedDb, the | |
| signing was allowed by reference to TimeStampDb as | |
| described above, and no hash matching content hash | |
| was found in RevokedDb. | |
| @retval EFI_SECURITY_VIOLATION The SignedData buffer was correctly formatted but | |
| signer was in RevokedDb or not in AllowedDb. Also | |
| returned if matching content hash found in RevokedDb. | |
| @retval EFI_COMPROMISED_DATA Calculated hash differs from signed hash. | |
| @retval EFI_INVALID_PARAMETER SignedData is NULL or SignedDataSize is zero. | |
| AllowedDb is NULL. | |
| @retval EFI_INVALID_PARAMETER Content is not NULL and ContentSize is NULL. | |
| @retval EFI_ABORTED Unsupported or invalid format in TimeStampDb, | |
| RevokedDb or AllowedDb list contents was detected. | |
| @retval EFI_NOT_FOUND Content not found because InData is NULL and no | |
| content embedded in SignedData. | |
| @retval EFI_UNSUPPORTED The SignedData buffer was not correctly formatted | |
| for processing by the function. | |
| @retval EFI_UNSUPPORTED Signed data embedded in SignedData but InData is not | |
| NULL. | |
| @retval EFI_BUFFER_TOO_SMALL The size of buffer indicated by ContentSize is too | |
| small to hold the content. ContentSize updated to | |
| required size. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| VerifyBuffer ( | |
| IN EFI_PKCS7_VERIFY_PROTOCOL *This, | |
| IN VOID *SignedData, | |
| IN UINTN SignedDataSize, | |
| IN VOID *InData OPTIONAL, | |
| IN UINTN InDataSize, | |
| IN EFI_SIGNATURE_LIST **AllowedDb, | |
| IN EFI_SIGNATURE_LIST **RevokedDb OPTIONAL, | |
| IN EFI_SIGNATURE_LIST **TimeStampDb OPTIONAL, | |
| OUT VOID *Content OPTIONAL, | |
| IN OUT UINTN *ContentSize | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_SIGNATURE_LIST *SigList; | |
| UINTN Index; | |
| UINT8 *AttachedData; | |
| UINTN AttachedDataSize; | |
| UINT8 *DataPtr; | |
| UINTN DataSize; | |
| // | |
| // Parameters Checking | |
| // | |
| if ((SignedData == NULL) || (SignedDataSize == 0) || (AllowedDb == NULL)) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| if ((Content != NULL) && (ContentSize == NULL)) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // Check if any invalid entry format in AllowedDb list contents | |
| // | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(AllowedDb[Index]); | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| if (SigList->SignatureListSize < sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize + | |
| SigList->SignatureSize) { | |
| return EFI_ABORTED; | |
| } | |
| } | |
| // | |
| // Check if any invalid entry format in RevokedDb list contents | |
| // | |
| if (RevokedDb != NULL) { | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(RevokedDb[Index]); | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| if (SigList->SignatureListSize < sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize + | |
| SigList->SignatureSize) { | |
| return EFI_ABORTED; | |
| } | |
| } | |
| } | |
| // | |
| // Check if any invalid entry format in TimeStampDb list contents | |
| // | |
| if (TimeStampDb != NULL) { | |
| for (Index = 0; ; Index++) { | |
| SigList = (EFI_SIGNATURE_LIST *)(TimeStampDb[Index]); | |
| if (SigList == NULL) { | |
| break; | |
| } | |
| if (SigList->SignatureListSize < sizeof (EFI_SIGNATURE_LIST) + | |
| SigList->SignatureHeaderSize + | |
| SigList->SignatureSize) { | |
| return EFI_ABORTED; | |
| } | |
| } | |
| } | |
| // | |
| // Try to retrieve the attached content from PKCS7 signedData | |
| // | |
| AttachedData = NULL; | |
| AttachedDataSize = 0; | |
| if (!Pkcs7GetAttachedContent ( | |
| SignedData, | |
| SignedDataSize, | |
| (VOID **)&AttachedData, | |
| &AttachedDataSize)) { | |
| // | |
| // The SignedData buffer was not correctly formatted for processing | |
| // | |
| return EFI_UNSUPPORTED; | |
| } | |
| if (AttachedData != NULL) { | |
| if (InData != NULL) { | |
| // | |
| // The embedded content is found in SignedData but InData is not NULL | |
| // | |
| Status = EFI_UNSUPPORTED; | |
| goto _Exit; | |
| } | |
| // | |
| // PKCS7-formatted signedData with attached content; Use the embedded | |
| // content for verification | |
| // | |
| DataPtr = AttachedData; | |
| DataSize = AttachedDataSize; | |
| } else if (InData != NULL) { | |
| // | |
| // PKCS7-formatted signedData with detached content; Use the user-supplied | |
| // input data for verification | |
| // | |
| DataPtr = (UINT8 *)InData; | |
| DataSize = InDataSize; | |
| } else { | |
| // | |
| // Content not found because InData is NULL and no content attached in SignedData | |
| // | |
| Status = EFI_NOT_FOUND; | |
| goto _Exit; | |
| } | |
| Status = EFI_UNSUPPORTED; | |
| // | |
| // Verify PKCS7 SignedData with Revoked database | |
| // | |
| if (RevokedDb != NULL) { | |
| Status = P7CheckRevocation ( | |
| SignedData, | |
| SignedDataSize, | |
| DataPtr, | |
| DataSize, | |
| RevokedDb, | |
| TimeStampDb | |
| ); | |
| if (!EFI_ERROR (Status)) { | |
| // | |
| // The PKCS7 SignedData is reovked | |
| // | |
| Status = EFI_SECURITY_VIOLATION; | |
| goto _Exit; | |
| } | |
| } | |
| // | |
| // Verify PKCS7 SignedData with AllowedDB | |
| // | |
| Status = P7CheckTrust ( | |
| SignedData, | |
| SignedDataSize, | |
| DataPtr, | |
| DataSize, | |
| AllowedDb | |
| ); | |
| if (EFI_ERROR (Status)) { | |
| // | |
| // Verification failed with AllowedDb | |
| // | |
| goto _Exit; | |
| } | |
| // | |
| // Copy the content portion after verification succeeds | |
| // | |
| if (Content != NULL) { | |
| if (*ContentSize < DataSize) { | |
| // | |
| // Caller-allocated buffer is too small to contain content | |
| // | |
| *ContentSize = DataSize; | |
| Status = EFI_BUFFER_TOO_SMALL; | |
| } else { | |
| *ContentSize = DataSize; | |
| CopyMem (Content, DataPtr, DataSize); | |
| } | |
| } | |
| _Exit: | |
| if (AttachedData != NULL) { | |
| FreePool (AttachedData); | |
| } | |
| return Status; | |
| } | |
| /** | |
| Processes a buffer containing binary DER-encoded detached PKCS7 signature. | |
| The hash of the signed data content is calculated and passed by the caller. Function | |
| verifies the signature of the content is valid and signing certificate was not revoked | |
| and is contained within a list of trusted signers. | |
| Note: because this function uses hashes and the specification contains a variety of | |
| hash choices, you should be aware that the check against the RevokedDb list | |
| will improperly succeed if the signature is revoked using a different hash | |
| algorithm. For this reason, you should either cycle through all UEFI supported | |
| hashes to see if one is forbidden, or rely on a single hash choice only if the | |
| UEFI signature authority only signs and revokes with a single hash (at time | |
| of writing, this hash choice is SHA256). | |
| @param[in] This Pointer to EFI_PKCS7_VERIFY_PROTOCOL instance. | |
| @param[in] Signature Points to buffer containing ASN.1 DER-encoded PKCS | |
| detached signature. | |
| @param[in] SignatureSize The size of Signature buffer in bytes. | |
| @param[in] InHash InHash points to buffer containing the caller | |
| calculated hash of the data. The parameter may not | |
| be NULL. | |
| @param[in] InHashSize The size in bytes of InHash buffer. | |
| @param[in] AllowedDb Pointer to a list of pointers to EFI_SIGNATURE_LIST | |
| structures. The list is terminated by a null | |
| pointer. The EFI_SIGNATURE_LIST structures contain | |
| lists of X.509 certificates of approved signers. | |
| Function recognizes signer certificates of type | |
| EFI_CERT_X509_GUID. Any hash certificate in AllowedDb | |
| list is ignored by this function. Function returns | |
| success if signer of the buffer is within this list | |
| (and not within RevokedDb). This parameter is | |
| required. | |
| @param[in] RevokedDb Optional pointer to a list of pointers to | |
| EFI_SIGNATURE_LIST structures. The list is terminated | |
| by a null pointer. List of X.509 certificates of | |
| revoked signers and revoked file hashes. Signature | |
| verification will always fail if the signer of the | |
| file or the hash of the data component of the buffer | |
| is in RevokedDb list. This parameter is optional | |
| and caller may pass Null if not required. | |
| @param[in] TimeStampDb Optional pointer to a list of pointers to | |
| EFI_SIGNATURE_LIST structures. The list is terminated | |
| by a null pointer. This parameter can be used to pass | |
| a list of X.509 certificates of trusted time stamp | |
| counter-signers. | |
| @retval EFI_SUCCESS Signed hash was verified against caller-provided | |
| hash of content, the signer's certificate was not | |
| found in RevokedDb, and was found in AllowedDb or | |
| if in signer is found in both AllowedDb and | |
| RevokedDb, the signing was allowed by reference to | |
| TimeStampDb as described above, and no hash matching | |
| content hash was found in RevokedDb. | |
| @retval EFI_SECURITY_VIOLATION The SignedData buffer was correctly formatted but | |
| signer was in RevokedDb or not in AllowedDb. Also | |
| returned if matching content hash found in RevokedDb. | |
| @retval EFI_COMPROMISED_DATA Caller provided hash differs from signed hash. Or, | |
| caller and encrypted hash are different sizes. | |
| @retval EFI_INVALID_PARAMETER Signature is NULL or SignatureSize is zero. InHash | |
| is NULL or InHashSize is zero. AllowedDb is NULL. | |
| @retval EFI_ABORTED Unsupported or invalid format in TimeStampDb, | |
| RevokedDb or AllowedDb list contents was detected. | |
| @retval EFI_UNSUPPORTED The Signature buffer was not correctly formatted | |
| for processing by the function. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| VerifySignature ( | |
| IN EFI_PKCS7_VERIFY_PROTOCOL *This, | |
| IN VOID *Signature, | |
| IN UINTN SignatureSize, | |
| IN VOID *InHash, | |
| IN UINTN InHashSize, | |
| IN EFI_SIGNATURE_LIST **AllowedDb, | |
| IN EFI_SIGNATURE_LIST **RevokedDb OPTIONAL, | |
| IN EFI_SIGNATURE_LIST **TimeStampDb OPTIONAL | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| // | |
| // Parameters Checking | |
| // | |
| if ((Signature == NULL) || (SignatureSize == 0) || (AllowedDb == NULL) | |
| || (InHash == NULL) || (InHashSize == 0)) { | |
| return EFI_INVALID_PARAMETER; | |
| } | |
| // | |
| // Verify PKCS7 SignedData with Revoked database | |
| // | |
| if (RevokedDb != NULL) { | |
| Status = P7CheckRevocationByHash ( | |
| Signature, | |
| SignatureSize, | |
| InHash, | |
| InHashSize, | |
| RevokedDb, | |
| TimeStampDb | |
| ); | |
| if (!EFI_ERROR (Status)) { | |
| // | |
| // The PKCS7 SignedData is reovked | |
| // | |
| return EFI_SECURITY_VIOLATION; | |
| } | |
| } | |
| // | |
| // Verify PKCS7 SignedData with AllowedDB | |
| // | |
| Status = P7CheckTrustByHash ( | |
| Signature, | |
| SignatureSize, | |
| InHash, | |
| InHashSize, | |
| AllowedDb | |
| ); | |
| return Status; | |
| } | |
| // | |
| // The PKCS7 Verification Protocol | |
| // | |
| EFI_PKCS7_VERIFY_PROTOCOL mPkcs7Verify = { | |
| VerifyBuffer, | |
| VerifySignature | |
| }; | |
| /** | |
| The user Entry Point for the PKCS7 Verification driver. | |
| @param[in] ImageHandle The firmware allocated handle for the EFI image. | |
| @param[in] SystemTable A pointer to the EFI System Table. | |
| @retval EFI_SUCCESS The entry point is executed successfully. | |
| @retval EFI_NOT_SUPPORTED Platform does not support PKCS7 Verification. | |
| @retval Other Some error occurs when executing this entry point. | |
| **/ | |
| EFI_STATUS | |
| EFIAPI | |
| Pkcs7VerifyDriverEntry ( | |
| IN EFI_HANDLE ImageHandle, | |
| IN EFI_SYSTEM_TABLE *SystemTable | |
| ) | |
| { | |
| EFI_STATUS Status; | |
| EFI_HANDLE Handle; | |
| EFI_PKCS7_VERIFY_PROTOCOL Useless; | |
| // | |
| // Avoid loading a second copy if this is built as an external module | |
| // | |
| Status = gBS->LocateProtocol (&gEfiPkcs7VerifyProtocolGuid, NULL, (VOID **)&Useless); | |
| if (!EFI_ERROR (Status)) { | |
| return EFI_ABORTED; | |
| } | |
| // | |
| // Install UEFI Pkcs7 Verification Protocol | |
| // | |
| Handle = NULL; | |
| Status = gBS->InstallMultipleProtocolInterfaces ( | |
| &Handle, | |
| &gEfiPkcs7VerifyProtocolGuid, | |
| &mPkcs7Verify, | |
| NULL | |
| ); | |
| return Status; | |
| } |