diff options
| author | gdong1 <gdong1@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-02 07:49:32 +0000 |
|---|---|---|
| committer | gdong1 <gdong1@6f19259b-4bc3-4df7-8a09-765794883524> | 2011-09-02 07:49:32 +0000 |
| commit | 0c18794ea4289f03fefc7117b56740414cc0536c (patch) | |
| tree | 4e51c5cc23c69a67cead8c58464da870daa4c029 /SecurityPkg/Library/DxeImageVerificationLib | |
| parent | 986d1dfb0813d6a7623531e85c2e2a7e1f956cf8 (diff) | |
| download | edk2-0c18794ea4289f03fefc7117b56740414cc0536c.tar.gz edk2-0c18794ea4289f03fefc7117b56740414cc0536c.tar.bz2 edk2-0c18794ea4289f03fefc7117b56740414cc0536c.zip | |
Add security package to repository.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@12261 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'SecurityPkg/Library/DxeImageVerificationLib')
3 files changed, 1642 insertions, 0 deletions
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c new file mode 100644 index 0000000000..148dbd5a89 --- /dev/null +++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c @@ -0,0 +1,1368 @@ +/** @file
+ Implement image verification services for secure boot service in UEFI2.3.1.
+
+Copyright (c) 2009 - 2011, 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 "DxeImageVerificationLib.h"
+
+EFI_IMAGE_OPTIONAL_HEADER_PTR_UNION mNtHeader;
+UINTN mImageSize;
+UINT32 mPeCoffHeaderOffset;
+UINT8 mImageDigest[MAX_DIGEST_SIZE];
+UINTN mImageDigestSize;
+EFI_IMAGE_DATA_DIRECTORY *mSecDataDir = NULL;
+UINT8 *mImageBase = NULL;
+EFI_GUID mCertType;
+
+//
+// Notify string for authorization UI.
+//
+CHAR16 mNotifyString1[MAX_NOTIFY_STRING_LEN] = L"Image verification pass but not found in authorized database!";
+CHAR16 mNotifyString2[MAX_NOTIFY_STRING_LEN] = L"Launch this image anyway? (Yes/Defer/No)";
+//
+// Public Exponent of RSA Key.
+//
+CONST UINT8 mRsaE[] = { 0x01, 0x00, 0x01 };
+
+
+//
+// OID ASN.1 Value for Hash Algorithms
+//
+UINT8 mHashOidValue[] = {
+ 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x02, 0x05, // OBJ_md5
+ 0x2B, 0x0E, 0x03, 0x02, 0x1A, // OBJ_sha1
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, // OBJ_sha224
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, // OBJ_sha256
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, // OBJ_sha384
+ 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, // OBJ_sha512
+ };
+
+HASH_TABLE mHash[] = {
+ { L"SHA1", 20, &mHashOidValue[8], 5, Sha1GetContextSize, Sha1Init, Sha1Update, Sha1Final },
+ { L"SHA224", 28, &mHashOidValue[13], 9, NULL, NULL, NULL, NULL },
+ { L"SHA256", 32, &mHashOidValue[22], 9, Sha256GetContextSize,Sha256Init, Sha256Update, Sha256Final},
+ { L"SHA384", 48, &mHashOidValue[31], 9, NULL, NULL, NULL, NULL },
+ { L"SHA512", 64, &mHashOidValue[40], 9, NULL, NULL, NULL, NULL }
+};
+
+
+/**
+ Get the image type.
+
+ @param[in] File This is a pointer to the device path of the file that is
+ being dispatched.
+
+ @return UINT32 Image Type
+
+**/
+UINT32
+GetImageType (
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *File
+ )
+{
+ EFI_STATUS Status;
+ EFI_HANDLE DeviceHandle;
+ EFI_DEVICE_PATH_PROTOCOL *TempDevicePath;
+ EFI_BLOCK_IO_PROTOCOL *BlockIo;
+
+ //
+ // First check to see if File is from a Firmware Volume
+ //
+ DeviceHandle = NULL;
+ TempDevicePath = (EFI_DEVICE_PATH_PROTOCOL *)File;
+ Status = gBS->LocateDevicePath (
+ &gEfiFirmwareVolume2ProtocolGuid,
+ &TempDevicePath,
+ &DeviceHandle
+ );
+ if (!EFI_ERROR (Status)) {
+ Status = gBS->OpenProtocol (
+ DeviceHandle,
+ &gEfiFirmwareVolume2ProtocolGuid,
+ NULL,
+ NULL,
+ NULL,
+ EFI_OPEN_PROTOCOL_TEST_PROTOCOL
+ );
+ if (!EFI_ERROR (Status)) {
+ return IMAGE_FROM_FV;
+ }
+ }
+
+ //
+ // Next check to see if File is from a Block I/O device
+ //
+ DeviceHandle = NULL;
+ TempDevicePath = (EFI_DEVICE_PATH_PROTOCOL *)File;
+ Status = gBS->LocateDevicePath (
+ &gEfiBlockIoProtocolGuid,
+ &TempDevicePath,
+ &DeviceHandle
+ );
+ if (!EFI_ERROR (Status)) {
+ BlockIo = NULL;
+ Status = gBS->OpenProtocol (
+ DeviceHandle,
+ &gEfiBlockIoProtocolGuid,
+ (VOID **) &BlockIo,
+ NULL,
+ NULL,
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL
+ );
+ if (!EFI_ERROR (Status) && BlockIo != NULL) {
+ if (BlockIo->Media != NULL) {
+ if (BlockIo->Media->RemovableMedia) {
+ //
+ // Block I/O is present and specifies the media is removable
+ //
+ return IMAGE_FROM_REMOVABLE_MEDIA;
+ } else {
+ //
+ // Block I/O is present and specifies the media is not removable
+ //
+ return IMAGE_FROM_FIXED_MEDIA;
+ }
+ }
+ }
+ }
+
+ //
+ // File is not in a Firmware Volume or on a Block I/O device, so check to see if
+ // the device path supports the Simple File System Protocol.
+ //
+ DeviceHandle = NULL;
+ TempDevicePath = (EFI_DEVICE_PATH_PROTOCOL *)File;
+ Status = gBS->LocateDevicePath (
+ &gEfiSimpleFileSystemProtocolGuid,
+ &TempDevicePath,
+ &DeviceHandle
+ );
+ if (!EFI_ERROR (Status)) {
+ //
+ // Simple File System is present without Block I/O, so assume media is fixed.
+ //
+ return IMAGE_FROM_FIXED_MEDIA;
+ }
+
+ //
+ // File is not from an FV, Block I/O or Simple File System, so the only options
+ // left are a PCI Option ROM and a Load File Protocol such as a PXE Boot from a NIC.
+ //
+ TempDevicePath = (EFI_DEVICE_PATH_PROTOCOL *)File;
+ while (!IsDevicePathEndType (TempDevicePath)) {
+ switch (DevicePathType (TempDevicePath)) {
+
+ case MEDIA_DEVICE_PATH:
+ if (DevicePathSubType (TempDevicePath) == MEDIA_RELATIVE_OFFSET_RANGE_DP) {
+ return IMAGE_FROM_OPTION_ROM;
+ }
+ break;
+
+ case MESSAGING_DEVICE_PATH:
+ if (DevicePathSubType(TempDevicePath) == MSG_MAC_ADDR_DP) {
+ return IMAGE_FROM_REMOVABLE_MEDIA;
+ }
+ break;
+
+ default:
+ break;
+ }
+ TempDevicePath = NextDevicePathNode (TempDevicePath);
+ }
+ return IMAGE_UNKNOWN;
+}
+
+/**
+ Caculate hash of Pe/Coff image based on the authenticode image hashing in
+ PE/COFF Specification 8.0 Appendix A
+
+ @param[in] HashAlg Hash algorithm type.
+
+ @retval TRUE Successfully hash image.
+ @retval FALSE Fail in hash image.
+
+**/
+BOOLEAN
+HashPeImage (
+ IN UINT32 HashAlg
+ )
+{
+ BOOLEAN Status;
+ UINT16 Magic;
+ EFI_IMAGE_SECTION_HEADER *Section;
+ VOID *HashCtx;
+ UINTN CtxSize;
+ UINT8 *HashBase;
+ UINTN HashSize;
+ UINTN SumOfBytesHashed;
+ EFI_IMAGE_SECTION_HEADER *SectionHeader;
+ UINTN Index;
+ UINTN Pos;
+
+ HashCtx = NULL;
+ SectionHeader = NULL;
+ Status = FALSE;
+
+ if ((HashAlg != HASHALG_SHA1) && (HashAlg != HASHALG_SHA256)) {
+ return FALSE;
+ }
+
+ //
+ // Initialize context of hash.
+ //
+ ZeroMem (mImageDigest, MAX_DIGEST_SIZE);
+
+ if (HashAlg == HASHALG_SHA1) {
+ mImageDigestSize = SHA1_DIGEST_SIZE;
+ mCertType = gEfiCertSha1Guid;
+ } else if (HashAlg == HASHALG_SHA256) {
+ mImageDigestSize = SHA256_DIGEST_SIZE;
+ mCertType = gEfiCertSha256Guid;
+ } else {
+ return FALSE;
+ }
+
+ CtxSize = mHash[HashAlg].GetContextSize();
+
+ HashCtx = AllocatePool (CtxSize);
+ ASSERT (HashCtx != NULL);
+
+ // 1. Load the image header into memory.
+
+ // 2. Initialize a SHA hash context.
+ Status = mHash[HashAlg].HashInit(HashCtx);
+
+ if (!Status) {
+ goto Done;
+ }
+ //
+ // Measuring PE/COFF Image Header;
+ // But CheckSum field and SECURITY data directory (certificate) are excluded
+ //
+ Magic = mNtHeader.Pe32->OptionalHeader.Magic;
+ //
+ // 3. Calculate the distance from the base of the image header to the image checksum address.
+ // 4. Hash the image header from its base to beginning of the image checksum.
+ //
+ HashBase = mImageBase;
+ if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
+ //
+ // Use PE32 offset.
+ //
+ HashSize = (UINTN) ((UINT8 *) (&mNtHeader.Pe32->OptionalHeader.CheckSum) - HashBase);
+ } else {
+ //
+ // Use PE32+ offset.
+ //
+ HashSize = (UINTN) ((UINT8 *) (&mNtHeader.Pe32Plus->OptionalHeader.CheckSum) - HashBase);
+ }
+
+ Status = mHash[HashAlg].HashUpdate(HashCtx, HashBase, HashSize);
+ if (!Status) {
+ goto Done;
+ }
+ //
+ // 5. Skip over the image checksum (it occupies a single ULONG).
+ // 6. Get the address of the beginning of the Cert Directory.
+ // 7. Hash everything from the end of the checksum to the start of the Cert Directory.
+ //
+ if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
+ //
+ // Use PE32 offset.
+ //
+ HashBase = (UINT8 *) &mNtHeader.Pe32->OptionalHeader.CheckSum + sizeof (UINT32);
+ HashSize = (UINTN) ((UINT8 *) (&mNtHeader.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - HashBase);
+ } else {
+ //
+ // Use PE32+ offset.
+ //
+ HashBase = (UINT8 *) &mNtHeader.Pe32Plus->OptionalHeader.CheckSum + sizeof (UINT32);
+ HashSize = (UINTN) ((UINT8 *) (&mNtHeader.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY]) - HashBase);
+ }
+
+ Status = mHash[HashAlg].HashUpdate(HashCtx, HashBase, HashSize);
+ if (!Status) {
+ goto Done;
+ }
+ //
+ // 8. Skip over the Cert Directory. (It is sizeof(IMAGE_DATA_DIRECTORY) bytes.)
+ // 9. Hash everything from the end of the Cert Directory to the end of image header.
+ //
+ if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
+ //
+ // Use PE32 offset
+ //
+ HashBase = (UINT8 *) &mNtHeader.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];
+ HashSize = mNtHeader.Pe32->OptionalHeader.SizeOfHeaders - (UINTN) ((UINT8 *) (&mNtHeader.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1]) - mImageBase);
+ } else {
+ //
+ // Use PE32+ offset.
+ //
+ HashBase = (UINT8 *) &mNtHeader.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1];
+ HashSize = mNtHeader.Pe32Plus->OptionalHeader.SizeOfHeaders - (UINTN) ((UINT8 *) (&mNtHeader.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY + 1]) - mImageBase);
+ }
+
+ Status = mHash[HashAlg].HashUpdate(HashCtx, HashBase, HashSize);
+ if (!Status) {
+ goto Done;
+ }
+ //
+ // 10. Set the SUM_OF_BYTES_HASHED to the size of the header.
+ //
+ if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
+ //
+ // Use PE32 offset.
+ //
+ SumOfBytesHashed = mNtHeader.Pe32->OptionalHeader.SizeOfHeaders;
+ } else {
+ //
+ // Use PE32+ offset
+ //
+ SumOfBytesHashed = mNtHeader.Pe32Plus->OptionalHeader.SizeOfHeaders;
+ }
+
+ //
+ // 11. Build a temporary table of pointers to all the IMAGE_SECTION_HEADER
+ // structures in the image. The 'NumberOfSections' field of the image
+ // header indicates how big the table should be. Do not include any
+ // IMAGE_SECTION_HEADERs in the table whose 'SizeOfRawData' field is zero.
+ //
+ SectionHeader = (EFI_IMAGE_SECTION_HEADER *) AllocateZeroPool (sizeof (EFI_IMAGE_SECTION_HEADER) * mNtHeader.Pe32->FileHeader.NumberOfSections);
+ ASSERT (SectionHeader != NULL);
+ //
+ // 12. Using the 'PointerToRawData' in the referenced section headers as
+ // a key, arrange the elements in the table in ascending order. In other
+ // words, sort the section headers according to the disk-file offset of
+ // the section.
+ //
+ Section = (EFI_IMAGE_SECTION_HEADER *) (
+ mImageBase +
+ mPeCoffHeaderOffset +
+ sizeof (UINT32) +
+ sizeof (EFI_IMAGE_FILE_HEADER) +
+ mNtHeader.Pe32->FileHeader.SizeOfOptionalHeader
+ );
+ for (Index = 0; Index < mNtHeader.Pe32->FileHeader.NumberOfSections; Index++) {
+ Pos = Index;
+ while ((Pos > 0) && (Section->PointerToRawData < SectionHeader[Pos - 1].PointerToRawData)) {
+ CopyMem (&SectionHeader[Pos], &SectionHeader[Pos - 1], sizeof (EFI_IMAGE_SECTION_HEADER));
+ Pos--;
+ }
+ CopyMem (&SectionHeader[Pos], Section, sizeof (EFI_IMAGE_SECTION_HEADER));
+ Section += 1;
+ }
+
+ //
+ // 13. Walk through the sorted table, bring the corresponding section
+ // into memory, and hash the entire section (using the 'SizeOfRawData'
+ // field in the section header to determine the amount of data to hash).
+ // 14. Add the section's 'SizeOfRawData' to SUM_OF_BYTES_HASHED .
+ // 15. Repeat steps 13 and 14 for all the sections in the sorted table.
+ //
+ for (Index = 0; Index < mNtHeader.Pe32->FileHeader.NumberOfSections; Index++) {
+ Section = &SectionHeader[Index];
+ if (Section->SizeOfRawData == 0) {
+ continue;
+ }
+ HashBase = mImageBase + Section->PointerToRawData;
+ HashSize = (UINTN) Section->SizeOfRawData;
+
+ Status = mHash[HashAlg].HashUpdate(HashCtx, HashBase, HashSize);
+ if (!Status) {
+ goto Done;
+ }
+
+ SumOfBytesHashed += HashSize;
+ }
+
+ //
+ // 16. If the file size is greater than SUM_OF_BYTES_HASHED, there is extra
+ // data in the file that needs to be added to the hash. This data begins
+ // at file offset SUM_OF_BYTES_HASHED and its length is:
+ // FileSize - (CertDirectory->Size)
+ //
+ if (mImageSize > SumOfBytesHashed) {
+ HashBase = mImageBase + SumOfBytesHashed;
+ if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
+ //
+ // Use PE32 offset.
+ //
+ HashSize = (UINTN)(
+ mImageSize -
+ mNtHeader.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size -
+ SumOfBytesHashed);
+ } else {
+ //
+ // Use PE32+ offset.
+ //
+ HashSize = (UINTN)(
+ mImageSize -
+ mNtHeader.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY].Size -
+ SumOfBytesHashed);
+ }
+
+ Status = mHash[HashAlg].HashUpdate(HashCtx, HashBase, HashSize);
+ if (!Status) {
+ goto Done;
+ }
+ }
+ Status = mHash[HashAlg].HashFinal(HashCtx, mImageDigest);
+
+Done:
+ if (HashCtx != NULL) {
+ FreePool (HashCtx);
+ }
+ if (SectionHeader != NULL) {
+ FreePool (SectionHeader);
+ }
+ return Status;
+}
+
+/**
+ Recognize the Hash algorithm in PE/COFF Authenticode and caculate hash of
+ Pe/Coff image based on the authenticode image hashing in PE/COFF Specification
+ 8.0 Appendix A
+
+ @retval EFI_UNSUPPORTED Hash algorithm is not supported.
+ @retval EFI_SUCCESS Hash successfully.
+
+**/
+EFI_STATUS
+HashPeImageByType (
+ VOID
+ )
+{
+ UINT8 Index;
+ WIN_CERTIFICATE_EFI_PKCS *PkcsCertData;
+
+ PkcsCertData = (WIN_CERTIFICATE_EFI_PKCS *) (mImageBase + mSecDataDir->VirtualAddress);
+
+ for (Index = 0; Index < HASHALG_MAX; Index++) {
+ //
+ // Check the Hash algorithm in PE/COFF Authenticode.
+ // According to PKCS#7 Definition:
+ // SignedData ::= SEQUENCE {
+ // version Version,
+ // digestAlgorithms DigestAlgorithmIdentifiers,
+ // contentInfo ContentInfo,
+ // .... }
+ // The DigestAlgorithmIdentifiers can be used to determine the hash algorithm in PE/COFF hashing
+ // This field has the fixed offset (+32) in final Authenticode ASN.1 data.
+ //
+ if (CompareMem (PkcsCertData->CertData + 32, mHash[Index].OidValue, mHash[Index].OidLength) == 0) {
+ break;
+ }
+ }
+
+ if (Index == HASHALG_MAX) {
+ return EFI_UNSUPPORTED;
+ }
+
+ //
+ // HASH PE Image based on Hash algorithm in PE/COFF Authenticode.
+ //
+ if (!HashPeImage(Index)) {
+ return EFI_UNSUPPORTED;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+ Returns the size of a given image execution info table in bytes.
+
+ This function returns the size, in bytes, of the image execution info table specified by
+ ImageExeInfoTable. If ImageExeInfoTable is NULL, then 0 is returned.
+
+ @param ImageExeInfoTable A pointer to a image execution info table structure.
+
+ @retval 0 If ImageExeInfoTable is NULL.
+ @retval Others The size of a image execution info table in bytes.
+
+**/
+UINTN
+GetImageExeInfoTableSize (
+ EFI_IMAGE_EXECUTION_INFO_TABLE *ImageExeInfoTable
+ )
+{
+ UINTN Index;
+ EFI_IMAGE_EXECUTION_INFO *ImageExeInfoItem;
+ UINTN TotalSize;
+
+ if (ImageExeInfoTable == NULL) {
+ return 0;
+ }
+
+ ImageExeInfoItem = (EFI_IMAGE_EXECUTION_INFO *) ((UINT8 *) ImageExeInfoTable + sizeof (EFI_IMAGE_EXECUTION_INFO_TABLE));
+ TotalSize = sizeof (EFI_IMAGE_EXECUTION_INFO_TABLE);
+ for (Index = 0; Index < ImageExeInfoTable->NumberOfImages; Index++) {
+ TotalSize += ReadUnaligned32 ((UINT32 *) &ImageExeInfoItem->InfoSize);
+ ImageExeInfoItem = (EFI_IMAGE_EXECUTION_INFO *) ((UINT8 *) ImageExeInfoItem + ReadUnaligned32 ((UINT32 *) &ImageExeInfoItem->InfoSize));
+ }
+
+ return TotalSize;
+}
+
+/**
+ Create an Image Execution Information Table entry and add it to system configuration table.
+
+ @param[in] Action Describes the action taken by the firmware regarding this image.
+ @param[in] Name Input a null-terminated, user-friendly name.
+ @param[in] DevicePath Input device path pointer.
+ @param[in] Signature Input signature info in EFI_SIGNATURE_LIST data structure.
+ @param[in] SignatureSize Size of signature.
+
+**/
+VOID
+AddImageExeInfo (
+ IN EFI_IMAGE_EXECUTION_ACTION Action,
+ IN CHAR16 *Name OPTIONAL,
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *DevicePath,
+ IN EFI_SIGNATURE_LIST *Signature OPTIONAL,
+ IN UINTN SignatureSize
+ )
+{
+ EFI_STATUS Status;
+ EFI_IMAGE_EXECUTION_INFO_TABLE *ImageExeInfoTable;
+ EFI_IMAGE_EXECUTION_INFO_TABLE *NewImageExeInfoTable;
+ EFI_IMAGE_EXECUTION_INFO *ImageExeInfoEntry;
+ UINTN ImageExeInfoTableSize;
+ UINTN NewImageExeInfoEntrySize;
+ UINTN NameStringLen;
+ UINTN DevicePathSize;
+
+ ASSERT (DevicePath != NULL);
+ ImageExeInfoTable = NULL;
+ NewImageExeInfoTable = NULL;
+ ImageExeInfoEntry = NULL;
+ NameStringLen = 0;
+
+ if (Name != NULL) {
+ NameStringLen = StrSize (Name);
+ }
+
+ ImageExeInfoTable = NULL;
+ EfiGetSystemConfigurationTable (&gEfiImageSecurityDatabaseGuid, (VOID**)&ImageExeInfoTable);
+ if (ImageExeInfoTable != NULL) {
+ //
+ // The table has been found!
+ // We must enlarge the table to accmodate the new exe info entry.
+ //
+ ImageExeInfoTableSize = GetImageExeInfoTableSize (ImageExeInfoTable);
+ } else {
+ //
+ // Not Found!
+ // We should create a new table to append to the configuration table.
+ //
+ ImageExeInfoTableSize = sizeof (EFI_IMAGE_EXECUTION_INFO_TABLE);
+ }
+
+ DevicePathSize = GetDevicePathSize (DevicePath);
+ NewImageExeInfoEntrySize = sizeof (EFI_IMAGE_EXECUTION_INFO) + NameStringLen + DevicePathSize + SignatureSize;
+ NewImageExeInfoTable = (EFI_IMAGE_EXECUTION_INFO_TABLE *) AllocateRuntimePool (ImageExeInfoTableSize + NewImageExeInfoEntrySize);
+ ASSERT (NewImageExeInfoTable != NULL);
+
+ if (ImageExeInfoTable != NULL) {
+ CopyMem (NewImageExeInfoTable, ImageExeInfoTable, ImageExeInfoTableSize);
+ } else {
+ NewImageExeInfoTable->NumberOfImages = 0;
+ }
+ NewImageExeInfoTable->NumberOfImages++;
+ ImageExeInfoEntry = (EFI_IMAGE_EXECUTION_INFO *) ((UINT8 *) NewImageExeInfoTable + ImageExeInfoTableSize);
+ //
+ // Update new item's infomation.
+ //
+ WriteUnaligned32 ((UINT32 *) &ImageExeInfoEntry->Action, Action);
+ WriteUnaligned32 ((UINT32 *) &ImageExeInfoEntry->InfoSize, (UINT32) NewImageExeInfoEntrySize);
+
+ if (Name != NULL) {
+ CopyMem ((UINT8 *) &ImageExeInfoEntry->InfoSize + sizeof (UINT32), Name, NameStringLen);
+ }
+ CopyMem (
+ (UINT8 *) &ImageExeInfoEntry->InfoSize + sizeof (UINT32) + NameStringLen,
+ DevicePath,
+ DevicePathSize
+ );
+ if (Signature != NULL) {
+ CopyMem (
+ (UINT8 *) &ImageExeInfoEntry->InfoSize + sizeof (UINT32) + NameStringLen + DevicePathSize,
+ Signature,
+ SignatureSize
+ );
+ }
+ //
+ // Update/replace the image execution table.
+ //
+ Status = gBS->InstallConfigurationTable (&gEfiImageSecurityDatabaseGuid, (VOID *) NewImageExeInfoTable);
+ ASSERT_EFI_ERROR (Status);
+ //
+ // Free Old table data!
+ //
+ if (ImageExeInfoTable != NULL) {
+ FreePool (ImageExeInfoTable);
+ }
+}
+
+/**
+ Discover if the UEFI image is authorized by user's policy setting.
+
+ @param[in] Policy Specify platform's policy setting.
+
+ @retval EFI_ACCESS_DENIED Image is not allowed to run.
+ @retval EFI_SECURITY_VIOLATION Image is deferred.
+ @retval EFI_SUCCESS Image is authorized to run.
+
+**/
+EFI_STATUS
+ImageAuthorization (
+ IN UINT32 Policy
+ )
+{
+ EFI_STATUS Status;
+ EFI_INPUT_KEY Key;
+
+ Status = EFI_ACCESS_DENIED;
+
+ switch (Policy) {
+
+ case QUERY_USER_ON_SECURITY_VIOLATION:
+ do {
+ CreatePopUp (EFI_LIGHTGRAY | EFI_BACKGROUND_BLUE, &Key, mNotifyString1, mNotifyString2, NULL);
+ if (Key.UnicodeChar == L'Y' || Key.UnicodeChar == L'y') {
+ Status = EFI_SUCCESS;
+ break;
+ } else if (Key.UnicodeChar == L'N' || Key.UnicodeChar == L'n') {
+ Status = EFI_ACCESS_DENIED;
+ break;
+ } else if (Key.UnicodeChar == L'D' || Key.UnicodeChar == L'd') {
+ Status = EFI_SECURITY_VIOLATION;
+ break;
+ }
+ } while (TRUE);
+ break;
+
+ case ALLOW_EXECUTE_ON_SECURITY_VIOLATION:
+ Status = EFI_SUCCESS;
+ break;
+
+ case DEFER_EXECUTE_ON_SECURITY_VIOLATION:
+ Status = EFI_SECURITY_VIOLATION;
+ break;
+
+ case DENY_EXECUTE_ON_SECURITY_VIOLATION:
+ Status = EFI_ACCESS_DENIED;
+ break;
+ }
+
+ return Status;
+}
+
+/**
+ Check whether signature is in specified database.
+
+ @param[in] VariableName Name of database variable that is searched in.
+ @param[in] Signature Pointer to signature that is searched for.
+ @param[in] CertType Pointer to hash algrithom.
+ @param[in] SignatureSize Size of Signature.
+
+ @return TRUE Found the signature in the variable database.
+ @return FALSE Not found the signature in the variable database.
+
+**/
+BOOLEAN
+IsSignatureFoundInDatabase (
+ IN CHAR16 *VariableName,
+ IN UINT8 *Signature,
+ IN EFI_GUID *CertType,
+ IN UINTN SignatureSize
+ )
+{
+ EFI_STATUS Status;
+ EFI_SIGNATURE_LIST *CertList;
+ EFI_SIGNATURE_DATA *Cert;
+ UINTN DataSize;
+ UINT8 *Data;
+ UINTN Index;
+ UINTN CertCount;
+ BOOLEAN IsFound;
+ //
+ // Read signature database variable.
+ //
+ IsFound = FALSE;
+ Data = NULL;
+ DataSize = 0;
+ Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, NULL);
+ if (Status != EFI_BUFFER_TOO_SMALL) {
+ return FALSE;
+ }
+
+ Data = (UINT8 *) AllocateZeroPool (DataSize);
+ ASSERT (Data != NULL);
+
+ Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, Data);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+ //
+ // Enumerate all signature data in SigDB to check if executable's signature exists.
+ //
+ CertList = (EFI_SIGNATURE_LIST *) Data;
+ while ((DataSize > 0) && (DataSize >= CertList->SignatureListSize)) {
+ CertCount = (CertList->SignatureListSize - CertList->SignatureHeaderSize) / CertList->SignatureSize;
+ Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) CertList + sizeof (EFI_SIGNATURE_LIST) + CertList->SignatureHeaderSize);
+ if ((CertList->SignatureSize == sizeof(EFI_SIGNATURE_DATA) - 1 + SignatureSize) && (CompareGuid(&CertList->SignatureType, CertType))) {
+ for (Index = 0; Index < CertCount; Index++) {
+ if (CompareMem (Cert->SignatureData, Signature, SignatureSize) == 0) {
+ //
+ // Find the signature in database.
+ //
+ IsFound = TRUE;
+ break;
+ }
+
+ Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) Cert + CertList->SignatureSize);
+ }
+
+ if (IsFound) {
+ break;
+ }
+ }
+
+ DataSize -= CertList->SignatureListSize;
+ CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList + CertList->SignatureListSize);
+ }
+
+Done:
+ if (Data != NULL) {
+ FreePool (Data);
+ }
+
+ return IsFound;
+}
+
+/**
+ Verify certificate in WIN_CERT_TYPE_PKCS_SIGNED_DATA format .
+
+ @retval EFI_SUCCESS Image pass verification.
+ @retval EFI_SECURITY_VIOLATION Image fail verification.
+ @retval other error value
+
+**/
+EFI_STATUS
+VerifyCertPkcsSignedData (
+ VOID
+ )
+{
+ EFI_STATUS Status;
+ BOOLEAN VerifyStatus;
+ WIN_CERTIFICATE_EFI_PKCS *PkcsCertData;
+ EFI_SIGNATURE_LIST *CertList;
+ EFI_SIGNATURE_DATA *Cert;
+ UINTN DataSize;
+ UINT8 *Data;
+ UINT8 *RootCert;
+ UINTN RootCertSize;
+ UINTN Index;
+ UINTN CertCount;
+
+ Data = NULL;
+ CertList = NULL;
+ Cert = NULL;
+ RootCert = NULL;
+ RootCertSize = 0;
+ VerifyStatus = FALSE;
+ PkcsCertData = (WIN_CERTIFICATE_EFI_PKCS *) (mImageBase + mSecDataDir->VirtualAddress);
+
+ //
+ // 1: Find certificate from KEK database and try to verify authenticode struct.
+ //
+ DataSize = 0;
+ Status = gRT->GetVariable (EFI_KEY_EXCHANGE_KEY_NAME, &gEfiGlobalVariableGuid, NULL, &DataSize, NULL);
+ if (Status == EFI_BUFFER_TOO_SMALL) {
+ Data = (UINT8 *)AllocateZeroPool (DataSize);
+ ASSERT (Data != NULL);
+
+ Status = gRT->GetVariable (EFI_KEY_EXCHANGE_KEY_NAME, &gEfiGlobalVariableGuid, NULL, &DataSize, (VOID *)Data);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ //
+ // Find Cert Enrolled in KEK database to verify the signature in pkcs7 signed data.
+ //
+ CertList = (EFI_SIGNATURE_LIST *) Data;
+ while ((DataSize > 0) && (DataSize >= CertList->SignatureListSize)) {
+ if (CompareGuid (&CertList->SignatureType, &gEfiCertX509Guid)) {
+ Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) CertList + sizeof (EFI_SIGNATURE_LIST) + CertList->SignatureHeaderSize);
+ CertCount = (CertList->SignatureListSize - sizeof (EFI_SIGNATURE_LIST) - CertList->SignatureHeaderSize) / CertList->SignatureSize;
+ for (Index = 0; Index < CertCount; Index++) {
+ //
+ // Iterate each Signature Data Node within this CertList for a verify
+ //
+ RootCert = Cert->SignatureData;
+ RootCertSize = CertList->SignatureSize;
+
+ //
+ // Call AuthenticodeVerify library to Verify Authenticode struct.
+ //
+ VerifyStatus = AuthenticodeVerify (
+ PkcsCertData->CertData,
+ mSecDataDir->Size - sizeof(PkcsCertData->Hdr),
+ RootCert,
+ RootCertSize,
+ mImageDigest,
+ mImageDigestSize
+ );
+
+ if (VerifyStatus) {
+ goto Done;
+ }
+ Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) Cert + CertList->SignatureSize);
+ }
+ }
+ DataSize -= CertList->SignatureListSize;
+ CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList + CertList->SignatureListSize);
+ }
+ }
+
+
+
+ //
+ // 2: Find certificate from DB database and try to verify authenticode struct.
+ //
+ DataSize = 0;
+ Status = gRT->GetVariable (EFI_IMAGE_SECURITY_DATABASE, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, NULL);
+ if (Status == EFI_BUFFER_TOO_SMALL) {
+ Data = (UINT8 *)AllocateZeroPool (DataSize);
+ ASSERT (Data != NULL);
+
+ Status = gRT->GetVariable (EFI_IMAGE_SECURITY_DATABASE, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, (VOID *)Data);
+ if (EFI_ERROR (Status)) {
+ goto Done;
+ }
+
+ //
+ // Find Cert Enrolled in DB database to verify the signature in pkcs7 signed data.
+ //
+ CertList = (EFI_SIGNATURE_LIST *) Data;
+ while ((DataSize > 0) && (DataSize >= CertList->SignatureListSize)) {
+ if (CompareGuid (&CertList->SignatureType, &gEfiCertX509Guid)) {
+ Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) CertList + sizeof (EFI_SIGNATURE_LIST) + CertList->SignatureHeaderSize);
+ CertCount = (CertList->SignatureListSize - sizeof (EFI_SIGNATURE_LIST) - CertList->SignatureHeaderSize) / CertList->SignatureSize;
+ for (Index = 0; Index < CertCount; Index++) {
+ //
+ // Iterate each Signature Data Node within this CertList for a verify
+ //
+ RootCert = Cert->SignatureData;
+ RootCertSize = CertList->SignatureSize;
+
+ //
+ // Call AuthenticodeVerify library to Verify Authenticode struct.
+ //
+ VerifyStatus = AuthenticodeVerify (
+ PkcsCertData->CertData,
+ mSecDataDir->Size - sizeof(PkcsCertData->Hdr),
+ RootCert,
+ RootCertSize,
+ mImageDigest,
+ mImageDigestSize
+ );
+
+ if (VerifyStatus) {
+ goto Done;
+ }
+ Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) Cert + CertList->SignatureSize);
+ }
+ }
+ DataSize -= CertList->SignatureListSize;
+ CertList = (EFI_SIGNATURE_LIST *) ((UINT8 *) CertList + CertList->SignatureListSize);
+ }
+ }
+
+Done:
+ if (Data != NULL) {
+ FreePool (Data);
+ }
+
+ if (VerifyStatus) {
+ return EFI_SUCCESS;
+ } else {
+ return EFI_SECURITY_VIOLATION;
+ }
+}
+
+/**
+ Verify certificate in WIN_CERTIFICATE_UEFI_GUID format.
+
+ @retval EFI_SUCCESS Image pass verification.
+ @retval EFI_SECURITY_VIOLATION Image fail verification.
+ @retval other error value
+
+**/
+EFI_STATUS
+VerifyCertUefiGuid (
+ VOID
+ )
+{
+ BOOLEAN Status;
+ WIN_CERTIFICATE_UEFI_GUID *EfiCert;
+ EFI_SIGNATURE_LIST *KekList;
+ EFI_SIGNATURE_DATA *KekItem;
+ EFI_CERT_BLOCK_RSA_2048_SHA256 *CertBlock;
+ VOID *Rsa;
+ UINTN KekCount;
+ UINTN Index;
+ UINTN KekDataSize;
+ BOOLEAN IsFound;
+ EFI_STATUS Result;
+
+ EfiCert = NULL;
+ KekList = NULL;
+ KekItem = NULL;
+ CertBlock = NULL;
+ Rsa = NULL;
+ Status = FALSE;
+ IsFound = FALSE;
+ KekDataSize = 0;
+
+ EfiCert = (WIN_CERTIFICATE_UEFI_GUID *) (mImageBase + mSecDataDir->VirtualAddress);
+ CertBlock = (EFI_CERT_BLOCK_RSA_2048_SHA256 *) EfiCert->CertData;
+ if (!CompareGuid (&EfiCert->CertType, &gEfiCertTypeRsa2048Sha256Guid)) {
+ //
+ // Invalid Certificate Data Type.
+ //
+ return EFI_SECURITY_VIOLATION;
+ }
+
+ //
+ // Get KEK database variable data size
+ //
+ Result = gRT->GetVariable (EFI_KEY_EXCHANGE_KEY_NAME, &gEfiGlobalVariableGuid, NULL, &KekDataSize, NULL);
+ if (Result != EFI_BUFFER_TOO_SMALL) {
+ return EFI_SECURITY_VIOLATION;
+ }
+
+ //
+ // Get KEK database variable.
+ //
+ KekList = GetEfiGlobalVariable (EFI_KEY_EXCHANGE_KEY_NAME);
+ if (KekList == NULL) {
+ return EFI_SECURITY_VIOLATION;
+ }
+
+ //
+ // Enumerate all Kek items in this list to verify the variable certificate data.
+ // If anyone is authenticated successfully, it means the variable is correct!
+ //
+ while ((KekDataSize > 0) && (KekDataSize >= KekList->SignatureListSize)) {
+ if (CompareGuid (&KekList->SignatureType, &gEfiCertRsa2048Guid)) {
+ KekItem = (EFI_SIGNATURE_DATA *) ((UINT8 *) KekList + sizeof (EFI_SIGNATURE_LIST) + KekList->SignatureHeaderSize);
+ KekCount = (KekList->SignatureListSize - sizeof (EFI_SIGNATURE_LIST) - KekList->SignatureHeaderSize) / KekList->SignatureSize;
+ for (Index = 0; Index < KekCount; Index++) {
+ if (CompareMem (KekItem->SignatureData, CertBlock->PublicKey, EFI_CERT_TYPE_RSA2048_SIZE) == 0) {
+ IsFound = TRUE;
+ break;
+ }
+ KekItem = (EFI_SIGNATURE_DATA *) ((UINT8 *) KekItem + KekList->SignatureSize);
+ }
+ }
+ KekDataSize -= KekList->SignatureListSize;
+ KekList = (EFI_SIGNATURE_LIST *) ((UINT8 *) KekList + KekList->SignatureListSize);
+ }
+
+ if (!IsFound) {
+ //
+ // Signed key is not a trust one.
+ //
+ goto Done;
+ }
+
+ //
+ // Now, we found the corresponding security policy.
+ // Verify the data payload.
+ //
+ Rsa = RsaNew ();
+ ASSERT (Rsa != NULL);
+ //
+ // Set RSA Key Components.
+ // NOTE: Only N and E are needed to be set as RSA public key for signature verification.
+ //
+ Status = RsaSetKey (Rsa, RsaKeyN, CertBlock->PublicKey, EFI_CERT_TYPE_RSA2048_SIZE);
+ if (!Status) {
+ goto Done;
+ }
+ Status = RsaSetKey (Rsa, RsaKeyE, mRsaE, sizeof (mRsaE));
+ if (!Status) {
+ goto Done;
+ }
+ //
+ // Verify the signature.
+ //
+ Status = RsaPkcs1Verify (
+ Rsa,
+ mImageDigest,
+ mImageDigestSize,
+ CertBlock->Signature,
+ EFI_CERT_TYPE_RSA2048_SHA256_SIZE
+ );
+
+Done:
+ if (KekList != NULL) {
+ FreePool (KekList);
+ }
+ if (Rsa != NULL ) {
+ RsaFree (Rsa);
+ }
+ if (Status) {
+ return EFI_SUCCESS;
+ } else {
+ return EFI_SECURITY_VIOLATION;
+ }
+}
+
+/**
+ Provide verification service for signed images, which include both signature validation
+ and platform policy control. For signature types, both UEFI WIN_CERTIFICATE_UEFI_GUID and
+ MSFT Authenticode type signatures are supported.
+
+ In this implementation, only verify external executables when in USER MODE.
+ Executables from FV is bypass, so pass in AuthenticationStatus is ignored.
+
+ @param[in] AuthenticationStatus
+ This is the authentication status returned from the security
+ measurement services for the input file.
+ @param[in] File This is a pointer to the device path of the file that is
+ being dispatched. This will optionally be used for logging.
+ @param[in] FileBuffer File buffer matches the input file device path.
+ @param[in] FileSize Size of File buffer matches the input file device path.
+
+ @retval EFI_SUCCESS The file specified by File did authenticate, and the
+ platform policy dictates that the DXE Core may use File.
+ @retval EFI_INVALID_PARAMETER File is NULL.
+ @retval EFI_SECURITY_VIOLATION The file specified by File did not authenticate, and
+ the platform policy dictates that File should be placed
+ in the untrusted state. A file may be promoted from
+ the untrusted to the trusted state at a future time
+ with a call to the Trust() DXE Service.
+ @retval EFI_ACCESS_DENIED The file specified by File did not authenticate, and
+ the platform policy dictates that File should not be
+ used for any purpose.
+
+**/
+EFI_STATUS
+EFIAPI
+DxeImageVerificationHandler (
+ IN UINT32 AuthenticationStatus,
+ IN CONST EFI_DEVICE_PATH_PROTOCOL *File,
+ IN VOID *FileBuffer,
+ IN UINTN FileSize
+ )
+
+{
+ EFI_STATUS Status;
+ UINT16 Magic;
+ EFI_IMAGE_DOS_HEADER *DosHdr;
+ EFI_STATUS VerifyStatus;
+ UINT8 *SetupMode;
+ EFI_SIGNATURE_LIST *SignatureList;
+ UINTN SignatureListSize;
+ EFI_SIGNATURE_DATA *Signature;
+ EFI_IMAGE_EXECUTION_ACTION Action;
+ WIN_CERTIFICATE *WinCertificate;
+ UINT32 Policy;
+
+ if (File == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ SignatureList = NULL;
+ SignatureListSize = 0;
+ WinCertificate = NULL;
+ Action = EFI_IMAGE_EXECUTION_AUTH_UNTESTED;
+ Status = EFI_ACCESS_DENIED;
+ //
+ // Check the image type and get policy setting.
+ //
+ switch (GetImageType (File)) {
+
+ case IMAGE_FROM_FV:
+ Policy = ALWAYS_EXECUTE;
+ break;
+
+ case IMAGE_FROM_OPTION_ROM:
+ Policy = PcdGet32 (PcdOptionRomImageVerificationPolicy);
+ break;
+
+ case IMAGE_FROM_REMOVABLE_MEDIA:
+ Policy = PcdGet32 (PcdRemovableMediaImageVerificationPolicy);
+ break;
+
+ case IMAGE_FROM_FIXED_MEDIA:
+ Policy = PcdGet32 (PcdFixedMediaImageVerificationPolicy);
+ break;
+
+ default:
+ Policy = DENY_EXECUTE_ON_SECURITY_VIOLATION;
+ break;
+ }
+ //
+ // If policy is always/never execute, return directly.
+ //
+ if (Policy == ALWAYS_EXECUTE) {
+ return EFI_SUCCESS;
+ } else if (Policy == NEVER_EXECUTE) {
+ return EFI_ACCESS_DENIED;
+ }
+ SetupMode = GetEfiGlobalVariable (EFI_SETUP_MODE_NAME);
+
+ //
+ // SetupMode doesn't exist means no AuthVar driver is dispatched,
+ // skip verification.
+ //
+ if (SetupMode == NULL) {
+ return EFI_SUCCESS;
+ }
+
+ //
+ // If platform is in SETUP MODE, skip verification.
+ //
+ if (*SetupMode == SETUP_MODE) {
+ FreePool (SetupMode);
+ return EFI_SUCCESS;
+ }
+ //
+ // Read the Dos header.
+ //
+ ASSERT (FileBuffer != NULL);
+ mImageBase = (UINT8 *) FileBuffer;
+ mImageSize = FileSize;
+ DosHdr = (EFI_IMAGE_DOS_HEADER *) (mImageBase);
+ if (DosHdr->e_magic == EFI_IMAGE_DOS_SIGNATURE) {
+ //
+ // DOS image header is present,
+ // so read the PE header after the DOS image header.
+ //
+ mPeCoffHeaderOffset = DosHdr->e_lfanew;
+ } else {
+ mPeCoffHeaderOffset = 0;
+ }
+ //
+ // Check PE/COFF image.
+ //
+ mNtHeader.Pe32 = (EFI_IMAGE_NT_HEADERS32 *) (mImageBase + mPeCoffHeaderOffset);
+ if (mNtHeader.Pe32->Signature != EFI_IMAGE_NT_SIGNATURE) {
+ //
+ // It is not a valid Pe/Coff file.
+ //
+ return EFI_ACCESS_DENIED;
+ }
+
+ Magic = mNtHeader.Pe32->OptionalHeader.Magic;
+ if (Magic == EFI_IMAGE_NT_OPTIONAL_HDR32_MAGIC) {
+ //
+ // Use PE32 offset.
+ //
+ mSecDataDir = (EFI_IMAGE_DATA_DIRECTORY *)&mNtHeader.Pe32->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY];
+ } else {
+ //
+ // Use PE32+ offset.
+ //
+ mSecDataDir = (EFI_IMAGE_DATA_DIRECTORY *)&mNtHeader.Pe32Plus->OptionalHeader.DataDirectory[EFI_IMAGE_DIRECTORY_ENTRY_SECURITY];
+ }
+
+ if (mSecDataDir->Size == 0) {
+ //
+ // This image is not signed.
+ //
+ Action = EFI_IMAGE_EXECUTION_AUTH_UNTESTED;
+ Status = EFI_ACCESS_DENIED;
+ goto Done;
+ }
+ //
+ // Verify signature of executables.
+ //
+ WinCertificate = (WIN_CERTIFICATE *) (mImageBase + mSecDataDir->VirtualAddress);
+
+ switch (WinCertificate->wCertificateType) {
+
+ case WIN_CERT_TYPE_EFI_GUID:
+ //
+ // Verify UEFI GUID type.
+ //
+ if (!HashPeImage (HASHALG_SHA256)) {
+ goto Done;
+ }
+
+ VerifyStatus = VerifyCertUefiGuid ();
+ break;
+
+ case WIN_CERT_TYPE_PKCS_SIGNED_DATA:
+ //
+ // Verify Pkcs signed data type.
+ //
+ Status = HashPeImageByType();
+ if (EFI_ERROR(Status)) {
+ goto Done;
+ }
+
+ VerifyStatus = VerifyCertPkcsSignedData ();
+
+ //
+ // For image verification against enrolled certificate(root or intermediate),
+ // no need to check image's hash in the allowed database.
+ //
+ if (!EFI_ERROR (VerifyStatus)) {
+ return EFI_SUCCESS;
+ }
+
+ default:
+ return EFI_ACCESS_DENIED;
+ }
+ //
+ // Get image hash value as executable's signature.
+ //
+ SignatureListSize = sizeof (EFI_SIGNATURE_LIST) + sizeof (EFI_SIGNATURE_DATA) - 1 + mImageDigestSize;
+ SignatureList = (EFI_SIGNATURE_LIST *) AllocateZeroPool (SignatureListSize);
+ ASSERT (SignatureList != NULL);
+ SignatureList->SignatureHeaderSize = 0;
+ SignatureList->SignatureListSize = (UINT32) SignatureListSize;
+ SignatureList->SignatureSize = (UINT32) mImageDigestSize;
+ CopyMem (&SignatureList->SignatureType, &mCertType, sizeof (EFI_GUID));
+ Signature = (EFI_SIGNATURE_DATA *) ((UINT8 *) SignatureList + sizeof (EFI_SIGNATURE_LIST));
+ CopyMem (Signature->SignatureData, mImageDigest, mImageDigestSize);
+ //
+ // Signature database check after verification.
+ //
+ if (EFI_ERROR (VerifyStatus)) {
+ //
+ // Verification failure.
+ //
+ Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FAILED;
+ Status = EFI_ACCESS_DENIED;
+ } else if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE1, Signature->SignatureData, &mCertType, mImageDigestSize)) {
+ //
+ // Executable signature verification passes, but is found in forbidden signature database.
+ //
+ Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND;
+ Status = EFI_ACCESS_DENIED;
+ } else if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE, Signature->SignatureData, &mCertType, mImageDigestSize)) {
+ //
+ // Executable signature is found in authorized signature database.
+ //
+ Status = EFI_SUCCESS;
+ } else {
+ //
+ // Executable signature verification passes, but cannot be found in authorized signature database.
+ // Get platform policy to determine the action.
+ //
+ Action = EFI_IMAGE_EXECUTION_AUTH_SIG_PASSED;
+ Status = ImageAuthorization (Policy);
+ }
+
+Done:
+ if (Status != EFI_SUCCESS) {
+ //
+ // Policy decides to defer or reject the image; add its information in image executable information table.
+ //
+ AddImageExeInfo (Action, NULL, File, SignatureList, SignatureListSize);
+ }
+
+ if (SignatureList != NULL) {
+ FreePool (SignatureList);
+ }
+
+ FreePool (SetupMode);
+
+ return Status;
+}
+
+/**
+ When VariableWriteArchProtocol install, create "SecureBoot" variable.
+
+ @param[in] Event Event whose notification function is being invoked.
+ @param[in] Context Pointer to the notification function's context.
+
+**/
+VOID
+EFIAPI
+VariableWriteCallBack (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ UINT8 SecureBootMode;
+ UINT8 *SecureBootModePtr;
+ EFI_STATUS Status;
+ VOID *ProtocolPointer;
+
+ Status = gBS->LocateProtocol (&gEfiVariableWriteArchProtocolGuid, NULL, &ProtocolPointer);
+ if (EFI_ERROR (Status)) {
+ return;
+ }
+
+ //
+ // Check whether "SecureBoot" variable exists.
+ // If this library is built-in, it means firmware has capability to perform
+ // driver signing verification.
+ //
+ SecureBootModePtr = GetEfiGlobalVariable (EFI_SECURE_BOOT_MODE_NAME);
+ if (SecureBootModePtr == NULL) {
+ SecureBootMode = SECURE_BOOT_MODE_DISABLE;
+ //
+ // Authenticated variable driver will update "SecureBoot" depending on SetupMode variable.
+ //
+ gRT->SetVariable (
+ EFI_SECURE_BOOT_MODE_NAME,
+ &gEfiGlobalVariableGuid,
+ EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
+ sizeof (UINT8),
+ &SecureBootMode
+ );
+ } else {
+ FreePool (SecureBootModePtr);
+ }
+}
+
+/**
+ Register security measurement handler.
+
+ @param ImageHandle ImageHandle of the loaded driver.
+ @param SystemTable Pointer to the EFI System Table.
+
+ @retval EFI_SUCCESS The handlers were registered successfully.
+**/
+EFI_STATUS
+EFIAPI
+DxeImageVerificationLibConstructor (
+ IN EFI_HANDLE ImageHandle,
+ IN EFI_SYSTEM_TABLE *SystemTable
+ )
+{
+ VOID *Registration;
+
+ //
+ // Register callback function upon VariableWriteArchProtocol.
+ //
+ EfiCreateProtocolNotifyEvent (
+ &gEfiVariableWriteArchProtocolGuid,
+ TPL_CALLBACK,
+ VariableWriteCallBack,
+ NULL,
+ &Registration
+ );
+
+ return RegisterSecurityHandler (
+ DxeImageVerificationHandler,
+ EFI_AUTH_OPERATION_VERIFY_IMAGE | EFI_AUTH_OPERATION_IMAGE_REQUIRED
+ );
+}
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h new file mode 100644 index 0000000000..34ed0c89a1 --- /dev/null +++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.h @@ -0,0 +1,201 @@ +/** @file
+ The internal header file includes the common header files, defines
+ internal structure and functions used by ImageVerificationLib.
+
+Copyright (c) 2009 - 2011, 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.
+
+**/
+
+#ifndef __IMAGEVERIFICATIONLIB_H__
+#define __IMAGEVERIFICATIONLIB_H__
+
+#include <Library/UefiDriverEntryPoint.h>
+#include <Library/DebugLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+#include <Library/UefiRuntimeServicesTableLib.h>
+#include <Library/UefiLib.h>
+#include <Library/BaseLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/BaseCryptLib.h>
+#include <Library/PcdLib.h>
+#include <Library/DevicePathLib.h>
+#include <Library/SecurityManagementLib.h>
+#include <Protocol/FirmwareVolume2.h>
+#include <Protocol/DevicePath.h>
+#include <Protocol/BlockIo.h>
+#include <Protocol/SimpleFileSystem.h>
+#include <Protocol/VariableWrite.h>
+#include <Guid/ImageAuthentication.h>
+#include <IndustryStandard/PeImage.h>
+
+#define EFI_CERT_TYPE_RSA2048_SHA256_SIZE 256
+#define EFI_CERT_TYPE_RSA2048_SIZE 256
+#define MAX_NOTIFY_STRING_LEN 64
+
+//
+// Image type definitions
+//
+#define IMAGE_UNKNOWN 0x00000000
+#define IMAGE_FROM_FV 0x00000001
+#define IMAGE_FROM_OPTION_ROM 0x00000002
+#define IMAGE_FROM_REMOVABLE_MEDIA 0x00000003
+#define IMAGE_FROM_FIXED_MEDIA 0x00000004
+
+//
+// Authorization policy bit definition
+//
+#define ALWAYS_EXECUTE 0x00000000
+#define NEVER_EXECUTE 0x00000001
+#define ALLOW_EXECUTE_ON_SECURITY_VIOLATION 0x00000002
+#define DEFER_EXECUTE_ON_SECURITY_VIOLATION 0x00000003
+#define DENY_EXECUTE_ON_SECURITY_VIOLATION 0x00000004
+#define QUERY_USER_ON_SECURITY_VIOLATION 0x00000005
+
+//
+// Support hash types
+//
+#define HASHALG_SHA1 0x00000000
+#define HASHALG_SHA224 0x00000001
+#define HASHALG_SHA256 0x00000002
+#define HASHALG_SHA384 0x00000003
+#define HASHALG_SHA512 0x00000004
+#define HASHALG_MAX 0x00000005
+
+//
+// Set max digest size as SHA256 Output (32 bytes) by far
+//
+#define MAX_DIGEST_SIZE SHA256_DIGEST_SIZE
+//
+//
+// PKCS7 Certificate definition
+//
+typedef struct {
+ WIN_CERTIFICATE Hdr;
+ UINT8 CertData[1];
+} WIN_CERTIFICATE_EFI_PKCS;
+
+
+/**
+ Retrieves the size, in bytes, of the context buffer required for hash operations.
+
+ @return The size, in bytes, of the context buffer required for hash operations.
+
+**/
+typedef
+UINTN
+(EFIAPI *HASH_GET_CONTEXT_SIZE)(
+ VOID
+ );
+
+/**
+ Initializes user-supplied memory pointed by HashContext as hash context for
+ subsequent use.
+
+ If HashContext is NULL, then ASSERT().
+
+ @param[in, out] HashContext Pointer to Context being initialized.
+
+ @retval TRUE HASH context initialization succeeded.
+ @retval FALSE HASH context initialization failed.
+
+**/
+typedef
+BOOLEAN
+(EFIAPI *HASH_INIT)(
+ IN OUT VOID *HashContext
+ );
+
+
+/**
+ Performs digest on a data buffer of the specified length. This function can
+ be called multiple times to compute the digest of long or discontinuous data streams.
+
+ If HashContext is NULL, then ASSERT().
+
+ @param[in, out] HashContext Pointer to the MD5 context.
+ @param[in] Data Pointer to the buffer containing the data to be hashed.
+ @param[in] DataLength Length of Data buffer in bytes.
+
+ @retval TRUE HASH data digest succeeded.
+ @retval FALSE Invalid HASH context. After HashFinal function has been called, the
+ HASH context cannot be reused.
+
+**/
+typedef
+BOOLEAN
+(EFIAPI *HASH_UPDATE)(
+ IN OUT VOID *HashContext,
+ IN CONST VOID *Data,
+ IN UINTN DataLength
+ );
+
+/**
+ Completes hash computation and retrieves the digest value into the specified
+ memory. After this function has been called, the context cannot be used again.
+
+ If HashContext is NULL, then ASSERT().
+ If HashValue is NULL, then ASSERT().
+
+ @param[in, out] HashContext Pointer to the MD5 context
+ @param[out] HashValue Pointer to a buffer that receives the HASH digest
+ value.
+
+ @retval TRUE HASH digest computation succeeded.
+ @retval FALSE HASH digest computation failed.
+
+**/
+typedef
+BOOLEAN
+(EFIAPI *HASH_FINAL)(
+ IN OUT VOID *HashContext,
+ OUT UINT8 *HashValue
+ );
+
+
+//
+// Hash Algorithm Table
+//
+typedef struct {
+ //
+ // Name for Hash Algorithm
+ //
+ CHAR16 *Name;
+ //
+ // Digest Length
+ //
+ UINTN DigestLength;
+ //
+ // Hash Algorithm OID ASN.1 Value
+ //
+ UINT8 *OidValue;
+ //
+ // Length of Hash OID Value
+ //
+ UINTN OidLength;
+ //
+ // Pointer to Hash GetContentSize function
+ //
+ HASH_GET_CONTEXT_SIZE GetContextSize;
+ //
+ // Pointer to Hash Init function
+ //
+ HASH_INIT HashInit;
+ //
+ // Pointer to Hash Update function
+ //
+ HASH_UPDATE HashUpdate;
+ //
+ // Pointer to Hash Final function
+ //
+ HASH_FINAL HashFinal;
+} HASH_TABLE;
+
+#endif
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf new file mode 100644 index 0000000000..5874d6b66b --- /dev/null +++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.inf @@ -0,0 +1,73 @@ +## @file
+# The library instance provides security service of image verification.
+# Image verification Library module supports UEFI2.3.1
+#
+# Copyright (c) 2009 - 2011, 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.
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010005
+ BASE_NAME = DxeImageVerificationLib
+ FILE_GUID = 0CA970E1-43FA-4402-BC0A-81AF336BFFD6
+ MODULE_TYPE = DXE_DRIVER
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = NULL|DXE_DRIVER DXE_RUNTIME_DRIVER DXE_SAL_DRIVER DXE_SMM_DRIVER UEFI_APPLICATION UEFI_DRIVER
+ CONSTRUCTOR = DxeImageVerificationLibConstructor
+
+#
+# The following information is for reference only and not required by the build tools.
+#
+# VALID_ARCHITECTURES = IA32 X64 IPF EBC
+#
+
+[Sources]
+ DxeImageVerificationLib.c
+ DxeImageVerificationLib.h
+
+[Packages]
+ MdePkg/MdePkg.dec
+ MdeModulePkg/MdeModulePkg.dec
+ CryptoPkg/CryptoPkg.dec
+ SecurityPkg/SecurityPkg.dec
+
+[LibraryClasses]
+ MemoryAllocationLib
+ BaseLib
+ UefiLib
+ UefiBootServicesTableLib
+ UefiRuntimeServicesTableLib
+ BaseMemoryLib
+ DebugLib
+ DevicePathLib
+ BaseCryptLib
+ SecurityManagementLib
+
+[Protocols]
+ gEfiFirmwareVolume2ProtocolGuid
+ gEfiBlockIoProtocolGuid
+ gEfiSimpleFileSystemProtocolGuid
+ gEfiVariableWriteArchProtocolGuid
+
+[Guids]
+ gEfiCertTypeRsa2048Sha256Guid
+ gEfiImageSecurityDatabaseGuid
+ gEfiCertSha1Guid
+ gEfiCertSha256Guid
+ gEfiCertX509Guid
+ gEfiCertRsa2048Guid
+
+[Pcd]
+ gEfiSecurityPkgTokenSpaceGuid.PcdOptionRomImageVerificationPolicy
+ gEfiSecurityPkgTokenSpaceGuid.PcdRemovableMediaImageVerificationPolicy
+ gEfiSecurityPkgTokenSpaceGuid.PcdFixedMediaImageVerificationPolicy
+
+
+
+
|