REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1608
To avoid false-negative issue in check hash against dbx, both error
condition (as return value) and check result (as out parameter) of
IsSignatureFoundInDatabase() are added. So the caller of this function
will know exactly if a failure is caused by a black list hit or
other error happening, and enforce a more secure operation to prevent
secure boot from being bypassed. For a white list check (db), there's
no such necessity.
All intermediate results inside this function will be checked and
returned immediately upon any failure or error, like out-of-resource,
hash calculation error or certificate retrieval failure.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
---
.../DxeImageVerificationLib.c | 77 ++++++++++++++-----
1 file changed, 58 insertions(+), 19 deletions(-)
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 5b7a67f811..8e599ca0be 100644
--- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
@@ -955,17 +955,19 @@ Done:
@param[in] Signature Pointer to signature that is searched for.
@param[in] CertType Pointer to hash algorithm.
@param[in] SignatureSize Size of Signature.
+ @param[out] IsFound Search result. Only valid if EFI_SUCCESS returned
- @return TRUE Found the signature in the variable database.
- @return FALSE Not found the signature in the variable database.
+ @retval EFI_SUCCESS Finished the search without any error.
+ @retval Others Error occurred in the search of database.
**/
-BOOLEAN
+EFI_STATUS
IsSignatureFoundInDatabase (
- IN CHAR16 *VariableName,
- IN UINT8 *Signature,
- IN EFI_GUID *CertType,
- IN UINTN SignatureSize
+ IN CHAR16 *VariableName,
+ IN UINT8 *Signature,
+ IN EFI_GUID *CertType,
+ IN UINTN SignatureSize,
+ OUT BOOLEAN *IsFound
)
{
EFI_STATUS Status;
@@ -975,22 +977,28 @@ IsSignatureFoundInDatabase (
UINT8 *Data;
UINTN Index;
UINTN CertCount;
- BOOLEAN IsFound;
//
// Read signature database variable.
//
- IsFound = FALSE;
+ *IsFound = FALSE;
Data = NULL;
DataSize = 0;
Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, NULL);
if (Status != EFI_BUFFER_TOO_SMALL) {
- return FALSE;
+ if (Status == EFI_NOT_FOUND) {
+ //
+ // No database, no need to search.
+ //
+ Status = EFI_SUCCESS;
+ }
+
+ return Status;
}
Data = (UINT8 *) AllocateZeroPool (DataSize);
if (Data == NULL) {
- return FALSE;
+ return EFI_OUT_OF_RESOURCES;
}
Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, Data);
@@ -1010,7 +1018,7 @@ IsSignatureFoundInDatabase (
//
// Find the signature in database.
//
- IsFound = TRUE;
+ *IsFound = TRUE;
//
// Entries in UEFI_IMAGE_SECURITY_DATABASE that are used to validate image should be measured
//
@@ -1023,7 +1031,7 @@ IsSignatureFoundInDatabase (
Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) Cert + CertList->SignatureSize);
}
- if (IsFound) {
+ if (*IsFound) {
break;
}
}
@@ -1037,7 +1045,7 @@ Done:
FreePool (Data);
}
- return IsFound;
+ return Status;
}
/**
@@ -1642,6 +1650,8 @@ DxeImageVerificationHandler (
CHAR16 *NameStr;
RETURN_STATUS PeCoffStatus;
EFI_STATUS HashStatus;
+ EFI_STATUS DbStatus;
+ BOOLEAN IsFound;
SignatureList = NULL;
SignatureListSize = 0;
@@ -1650,7 +1660,7 @@ DxeImageVerificationHandler (
PkcsCertData = NULL;
Action = EFI_IMAGE_EXECUTION_AUTH_UNTESTED;
IsVerified = FALSE;
-
+ IsFound = FALSE;
//
// Check the image type and get policy setting.
@@ -1792,7 +1802,14 @@ DxeImageVerificationHandler (
goto Failed;
}
- if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE1, mImageDigest, &mCertType, mImageDigestSize)) {
+ DbStatus = IsSignatureFoundInDatabase (
+ EFI_IMAGE_SECURITY_DATABASE1,
+ mImageDigest,
+ &mCertType,
+ mImageDigestSize,
+ &IsFound
+ );
+ if (EFI_ERROR (DbStatus) || IsFound) {
//
// Image Hash is in forbidden database (DBX).
//
@@ -1800,7 +1817,14 @@ DxeImageVerificationHandler (
goto Failed;
}
- if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE, mImageDigest, &mCertType, mImageDigestSize)) {
+ DbStatus = IsSignatureFoundInDatabase (
+ EFI_IMAGE_SECURITY_DATABASE,
+ mImageDigest,
+ &mCertType,
+ mImageDigestSize,
+ &IsFound
+ );
+ if (!EFI_ERROR (DbStatus) && IsFound) {
//
// Image Hash is in allowed database (DB).
//
@@ -1888,14 +1912,29 @@ DxeImageVerificationHandler (
//
// Check the image's hash value.
//
- if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE1, mImageDigest, &mCertType, mImageDigestSize)) {
+ DbStatus = IsSignatureFoundInDatabase (
+ EFI_IMAGE_SECURITY_DATABASE1,
+ mImageDigest,
+ &mCertType,
+ mImageDigestSize,
+ &IsFound
+ );
+ if (EFI_ERROR (DbStatus) || IsFound) {
Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND;
DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed but %s hash of image is found in DBX.\n", mHashTypeStr));
IsVerified = FALSE;
break;
}
+
if (!IsVerified) {
- if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE, mImageDigest, &mCertType, mImageDigestSize)) {
+ DbStatus = IsSignatureFoundInDatabase (
+ EFI_IMAGE_SECURITY_DATABASE,
+ mImageDigest,
+ &mCertType,
+ mImageDigestSize,
+ &IsFound
+ );
+ if (!EFI_ERROR (DbStatus) && IsFound) {
IsVerified = TRUE;
} else {
DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed but signature is not allowed by DB and %s hash of image is not found in DB/DBX.\n", mHashTypeStr));
--
2.24.0.windows.2
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Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
> -----Original Message-----
> From: Wang, Jian J <jian.j.wang@intel.com>
> Sent: Thursday, February 6, 2020 10:20 PM
> To: devel@edk2.groups.io
> Cc: Yao, Jiewen <jiewen.yao@intel.com>; Zhang, Chao B
> <chao.b.zhang@intel.com>
> Subject: [PATCH 9/9] SecurityPkg/DxeImageVerificationLib: Differentiate error
> and search result in IsSignatureFoundInDatabase(CVE-2019-14575)
>
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1608
>
> To avoid false-negative issue in check hash against dbx, both error
> condition (as return value) and check result (as out parameter) of
> IsSignatureFoundInDatabase() are added. So the caller of this function
> will know exactly if a failure is caused by a black list hit or
> other error happening, and enforce a more secure operation to prevent
> secure boot from being bypassed. For a white list check (db), there's
> no such necessity.
>
> All intermediate results inside this function will be checked and
> returned immediately upon any failure or error, like out-of-resource,
> hash calculation error or certificate retrieval failure.
>
> Cc: Jiewen Yao <jiewen.yao@intel.com>
> Cc: Chao Zhang <chao.b.zhang@intel.com>
> Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
> ---
> .../DxeImageVerificationLib.c | 77 ++++++++++++++-----
> 1 file changed, 58 insertions(+), 19 deletions(-)
>
> diff --git
> a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
> b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
> index 5b7a67f811..8e599ca0be 100644
> --- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
> +++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
> @@ -955,17 +955,19 @@ Done:
> @param[in] Signature Pointer to signature that is searched for.
>
> @param[in] CertType Pointer to hash algorithm.
>
> @param[in] SignatureSize Size of Signature.
>
> + @param[out] IsFound Search result. Only valid if EFI_SUCCESS returned
>
>
>
> - @return TRUE Found the signature in the variable database.
>
> - @return FALSE Not found the signature in the variable database.
>
> + @retval EFI_SUCCESS Finished the search without any error.
>
> + @retval Others Error occurred in the search of database.
>
>
>
> **/
>
> -BOOLEAN
>
> +EFI_STATUS
>
> IsSignatureFoundInDatabase (
>
> - IN CHAR16 *VariableName,
>
> - IN UINT8 *Signature,
>
> - IN EFI_GUID *CertType,
>
> - IN UINTN SignatureSize
>
> + IN CHAR16 *VariableName,
>
> + IN UINT8 *Signature,
>
> + IN EFI_GUID *CertType,
>
> + IN UINTN SignatureSize,
>
> + OUT BOOLEAN *IsFound
>
> )
>
> {
>
> EFI_STATUS Status;
>
> @@ -975,22 +977,28 @@ IsSignatureFoundInDatabase (
> UINT8 *Data;
>
> UINTN Index;
>
> UINTN CertCount;
>
> - BOOLEAN IsFound;
>
>
>
> //
>
> // Read signature database variable.
>
> //
>
> - IsFound = FALSE;
>
> + *IsFound = FALSE;
>
> Data = NULL;
>
> DataSize = 0;
>
> Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid,
> NULL, &DataSize, NULL);
>
> if (Status != EFI_BUFFER_TOO_SMALL) {
>
> - return FALSE;
>
> + if (Status == EFI_NOT_FOUND) {
>
> + //
>
> + // No database, no need to search.
>
> + //
>
> + Status = EFI_SUCCESS;
>
> + }
>
> +
>
> + return Status;
>
> }
>
>
>
> Data = (UINT8 *) AllocateZeroPool (DataSize);
>
> if (Data == NULL) {
>
> - return FALSE;
>
> + return EFI_OUT_OF_RESOURCES;
>
> }
>
>
>
> Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid,
> NULL, &DataSize, Data);
>
> @@ -1010,7 +1018,7 @@ IsSignatureFoundInDatabase (
> //
>
> // Find the signature in database.
>
> //
>
> - IsFound = TRUE;
>
> + *IsFound = TRUE;
>
> //
>
> // Entries in UEFI_IMAGE_SECURITY_DATABASE that are used to validate
> image should be measured
>
> //
>
> @@ -1023,7 +1031,7 @@ IsSignatureFoundInDatabase (
> Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) Cert + CertList->SignatureSize);
>
> }
>
>
>
> - if (IsFound) {
>
> + if (*IsFound) {
>
> break;
>
> }
>
> }
>
> @@ -1037,7 +1045,7 @@ Done:
> FreePool (Data);
>
> }
>
>
>
> - return IsFound;
>
> + return Status;
>
> }
>
>
>
> /**
>
> @@ -1642,6 +1650,8 @@ DxeImageVerificationHandler (
> CHAR16 *NameStr;
>
> RETURN_STATUS PeCoffStatus;
>
> EFI_STATUS HashStatus;
>
> + EFI_STATUS DbStatus;
>
> + BOOLEAN IsFound;
>
>
>
> SignatureList = NULL;
>
> SignatureListSize = 0;
>
> @@ -1650,7 +1660,7 @@ DxeImageVerificationHandler (
> PkcsCertData = NULL;
>
> Action = EFI_IMAGE_EXECUTION_AUTH_UNTESTED;
>
> IsVerified = FALSE;
>
> -
>
> + IsFound = FALSE;
>
>
>
> //
>
> // Check the image type and get policy setting.
>
> @@ -1792,7 +1802,14 @@ DxeImageVerificationHandler (
> goto Failed;
>
> }
>
>
>
> - if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE1,
> mImageDigest, &mCertType, mImageDigestSize)) {
>
> + DbStatus = IsSignatureFoundInDatabase (
>
> + EFI_IMAGE_SECURITY_DATABASE1,
>
> + mImageDigest,
>
> + &mCertType,
>
> + mImageDigestSize,
>
> + &IsFound
>
> + );
>
> + if (EFI_ERROR (DbStatus) || IsFound) {
>
> //
>
> // Image Hash is in forbidden database (DBX).
>
> //
>
> @@ -1800,7 +1817,14 @@ DxeImageVerificationHandler (
> goto Failed;
>
> }
>
>
>
> - if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE,
> mImageDigest, &mCertType, mImageDigestSize)) {
>
> + DbStatus = IsSignatureFoundInDatabase (
>
> + EFI_IMAGE_SECURITY_DATABASE,
>
> + mImageDigest,
>
> + &mCertType,
>
> + mImageDigestSize,
>
> + &IsFound
>
> + );
>
> + if (!EFI_ERROR (DbStatus) && IsFound) {
>
> //
>
> // Image Hash is in allowed database (DB).
>
> //
>
> @@ -1888,14 +1912,29 @@ DxeImageVerificationHandler (
> //
>
> // Check the image's hash value.
>
> //
>
> - if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE1,
> mImageDigest, &mCertType, mImageDigestSize)) {
>
> + DbStatus = IsSignatureFoundInDatabase (
>
> + EFI_IMAGE_SECURITY_DATABASE1,
>
> + mImageDigest,
>
> + &mCertType,
>
> + mImageDigestSize,
>
> + &IsFound
>
> + );
>
> + if (EFI_ERROR (DbStatus) || IsFound) {
>
> Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND;
>
> DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed but %s
> hash of image is found in DBX.\n", mHashTypeStr));
>
> IsVerified = FALSE;
>
> break;
>
> }
>
> +
>
> if (!IsVerified) {
>
> - if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE,
> mImageDigest, &mCertType, mImageDigestSize)) {
>
> + DbStatus = IsSignatureFoundInDatabase (
>
> + EFI_IMAGE_SECURITY_DATABASE,
>
> + mImageDigest,
>
> + &mCertType,
>
> + mImageDigestSize,
>
> + &IsFound
>
> + );
>
> + if (!EFI_ERROR (DbStatus) && IsFound) {
>
> IsVerified = TRUE;
>
> } else {
>
> DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed but
> signature is not allowed by DB and %s hash of image is not found in DB/DBX.\n",
> mHashTypeStr));
>
> --
> 2.24.0.windows.2
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Ack-by : Chao Zhang <chao.b.zhang@intel.com>
-----Original Message-----
From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of Wang, Jian J
Sent: Thursday, February 6, 2020 10:20 PM
To: devel@edk2.groups.io
Cc: Yao, Jiewen <jiewen.yao@intel.com>; Zhang, Chao B <chao.b.zhang@intel.com>
Subject: [edk2-devel] [PATCH 9/9] SecurityPkg/DxeImageVerificationLib: Differentiate error and search result in IsSignatureFoundInDatabase(CVE-2019-14575)
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1608
To avoid false-negative issue in check hash against dbx, both error condition (as return value) and check result (as out parameter) of
IsSignatureFoundInDatabase() are added. So the caller of this function will know exactly if a failure is caused by a black list hit or other error happening, and enforce a more secure operation to prevent secure boot from being bypassed. For a white list check (db), there's no such necessity.
All intermediate results inside this function will be checked and returned immediately upon any failure or error, like out-of-resource, hash calculation error or certificate retrieval failure.
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Chao Zhang <chao.b.zhang@intel.com>
Signed-off-by: Jian J Wang <jian.j.wang@intel.com>
---
.../DxeImageVerificationLib.c | 77 ++++++++++++++-----
1 file changed, 58 insertions(+), 19 deletions(-)
diff --git a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
index 5b7a67f811..8e599ca0be 100644
--- a/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLib.c
+++ b/SecurityPkg/Library/DxeImageVerificationLib/DxeImageVerificationLi
+++ b.c
@@ -955,17 +955,19 @@ Done:
@param[in] Signature Pointer to signature that is searched for. @param[in] CertType Pointer to hash algorithm. @param[in] SignatureSize Size of Signature.+ @param[out] IsFound Search result. Only valid if EFI_SUCCESS returned - @return TRUE Found the signature in the variable database.- @return FALSE Not found the signature in the variable database.+ @retval EFI_SUCCESS Finished the search without any error.+ @retval Others Error occurred in the search of database. **/-BOOLEAN+EFI_STATUS IsSignatureFoundInDatabase (- IN CHAR16 *VariableName,- IN UINT8 *Signature,- IN EFI_GUID *CertType,- IN UINTN SignatureSize+ IN CHAR16 *VariableName,+ IN UINT8 *Signature,+ IN EFI_GUID *CertType,+ IN UINTN SignatureSize,+ OUT BOOLEAN *IsFound ) { EFI_STATUS Status;@@ -975,22 +977,28 @@ IsSignatureFoundInDatabase (
UINT8 *Data; UINTN Index; UINTN CertCount;- BOOLEAN IsFound; // // Read signature database variable. //- IsFound = FALSE;+ *IsFound = FALSE; Data = NULL; DataSize = 0; Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, NULL); if (Status != EFI_BUFFER_TOO_SMALL) {- return FALSE;+ if (Status == EFI_NOT_FOUND) {+ //+ // No database, no need to search.+ //+ Status = EFI_SUCCESS;+ }++ return Status; } Data = (UINT8 *) AllocateZeroPool (DataSize); if (Data == NULL) {- return FALSE;+ return EFI_OUT_OF_RESOURCES; } Status = gRT->GetVariable (VariableName, &gEfiImageSecurityDatabaseGuid, NULL, &DataSize, Data);@@ -1010,7 +1018,7 @@ IsSignatureFoundInDatabase (
// // Find the signature in database. //- IsFound = TRUE;+ *IsFound = TRUE; // // Entries in UEFI_IMAGE_SECURITY_DATABASE that are used to validate image should be measured //@@ -1023,7 +1031,7 @@ IsSignatureFoundInDatabase (
Cert = (EFI_SIGNATURE_DATA *) ((UINT8 *) Cert + CertList->SignatureSize); } - if (IsFound) {+ if (*IsFound) { break; } }@@ -1037,7 +1045,7 @@ Done:
FreePool (Data); } - return IsFound;+ return Status; } /**@@ -1642,6 +1650,8 @@ DxeImageVerificationHandler (
CHAR16 *NameStr; RETURN_STATUS PeCoffStatus; EFI_STATUS HashStatus;+ EFI_STATUS DbStatus;+ BOOLEAN IsFound; SignatureList = NULL; SignatureListSize = 0;@@ -1650,7 +1660,7 @@ DxeImageVerificationHandler (
PkcsCertData = NULL; Action = EFI_IMAGE_EXECUTION_AUTH_UNTESTED; IsVerified = FALSE;-+ IsFound = FALSE; // // Check the image type and get policy setting.@@ -1792,7 +1802,14 @@ DxeImageVerificationHandler (
goto Failed; } - if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE1, mImageDigest, &mCertType, mImageDigestSize)) {+ DbStatus = IsSignatureFoundInDatabase (+ EFI_IMAGE_SECURITY_DATABASE1,+ mImageDigest,+ &mCertType,+ mImageDigestSize,+ &IsFound+ );+ if (EFI_ERROR (DbStatus) || IsFound) { // // Image Hash is in forbidden database (DBX). //@@ -1800,7 +1817,14 @@ DxeImageVerificationHandler (
goto Failed; } - if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE, mImageDigest, &mCertType, mImageDigestSize)) {+ DbStatus = IsSignatureFoundInDatabase (+ EFI_IMAGE_SECURITY_DATABASE,+ mImageDigest,+ &mCertType,+ mImageDigestSize,+ &IsFound+ );+ if (!EFI_ERROR (DbStatus) && IsFound) { // // Image Hash is in allowed database (DB). //@@ -1888,14 +1912,29 @@ DxeImageVerificationHandler (
// // Check the image's hash value. //- if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE1, mImageDigest, &mCertType, mImageDigestSize)) {+ DbStatus = IsSignatureFoundInDatabase (+ EFI_IMAGE_SECURITY_DATABASE1,+ mImageDigest,+ &mCertType,+ mImageDigestSize,+ &IsFound+ );+ if (EFI_ERROR (DbStatus) || IsFound) { Action = EFI_IMAGE_EXECUTION_AUTH_SIG_FOUND; DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed but %s hash of image is found in DBX.\n", mHashTypeStr)); IsVerified = FALSE; break; }+ if (!IsVerified) {- if (IsSignatureFoundInDatabase (EFI_IMAGE_SECURITY_DATABASE, mImageDigest, &mCertType, mImageDigestSize)) {+ DbStatus = IsSignatureFoundInDatabase (+ EFI_IMAGE_SECURITY_DATABASE,+ mImageDigest,+ &mCertType,+ mImageDigestSize,+ &IsFound+ );+ if (!EFI_ERROR (DbStatus) && IsFound) { IsVerified = TRUE; } else { DEBUG ((DEBUG_INFO, "DxeImageVerificationLib: Image is signed but signature is not allowed by DB and %s hash of image is not found in DB/DBX.\n", mHashTypeStr));--
2.24.0.windows.2
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