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system76-edk2/SecurityPkg/Pkcs7Verify/Pkcs7VerifyDxe/Pkcs7VerifyDxe.c
Antoine Coeur fc70522ffe SecurityPkg: Fix few typos 
Fix few typos in comments and documentation.

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Signed-off-by: Antoine Coeur <coeur@gmx.fr>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
Signed-off-by: Philippe Mathieu-Daude <philmd@redhat.com>
Message-Id: <20200207010831.9046-63-philmd@redhat.com>
2020-02-10 22:30:07 +00:00

1487 lines
53 KiB
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/** @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>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#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 separate 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
counterSignature 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 message 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 revoked, because the timestamping
// occurred 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
counterSignature 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 revoked, because the timestamping
// occurred 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 revoked
//
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 revoked
//
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;
}
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