* [PATCH] SecurityPkg: fix sha256 signature check
@ 2018-05-09 22:09 James Bottomley
2018-05-10 12:36 ` Laszlo Ersek
0 siblings, 1 reply; 3+ messages in thread
From: James Bottomley @ 2018-05-09 22:09 UTC (permalink / raw)
To: edk2-devel@lists.01.org; +Cc: Zhang Lubo
commit c035e37335ae43229d7e68de74a65f2c01ebc0af
Author: Zhang Lubo <lubo.zhang@intel.com>
Date: Thu Jan 5 14:58:05 2017 +0800
SecurityPkg: enhance secure boot Config Dxe & Time Based AuthVariable.
Added a check for sha256 being the ownly allowed signature hash.
Unfortuantely this commit assumed the form of the signature data was a
raw SignedData sequence. Most tools actually generate a ContentInfo
sequence instead which contains a header identifying the content as
pkcs7-SignedData. Fix this check to allow either format to work.
This fix is needed at least for efitools because we generate signed
variable updates with the ContentInfo header.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---
CryptoPkg/Library/OpensslLib/openssl | 2 +-
SecurityPkg/Library/AuthVariableLib/AuthService.c | 11 ++++++++++-
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/CryptoPkg/Library/OpensslLib/openssl b/CryptoPkg/Library/OpensslLib/openssl
index b2758a2292..d4e4bd2a81 160000
--- a/CryptoPkg/Library/OpensslLib/openssl
+++ b/CryptoPkg/Library/OpensslLib/openssl
@@ -1 +1 @@
-Subproject commit b2758a2292aceda93e9f44c219b94fe21bb9a650
+Subproject commit d4e4bd2a8163f355fa8a3884077eaec7adc75ff7
diff --git a/SecurityPkg/Library/AuthVariableLib/AuthService.c b/SecurityPkg/Library/AuthVariableLib/AuthService.c
index 213a524f27..855ea3350a 100644
--- a/SecurityPkg/Library/AuthVariableLib/AuthService.c
+++ b/SecurityPkg/Library/AuthVariableLib/AuthService.c
@@ -1908,10 +1908,19 @@ VerifyTimeBasedPayload (
// in VARIABLE_AUTHENTICATION_2 descriptor.
// This field has the fixed offset (+13) and be calculated based on two bytes of length encoding.
//
+ // However the data may also begin
+ // ContentInfo ::= SEQUENCE {
+ // contentType ContentType,
+ // content
+ // [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
+ //
+ // In which case the fixed offset is +32
+ //
if ((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) != 0) {
if (SigDataSize >= (13 + sizeof (mSha256OidValue))) {
if (((*(SigData + 1) & TWO_BYTE_ENCODE) != TWO_BYTE_ENCODE) ||
- (CompareMem (SigData + 13, &mSha256OidValue, sizeof (mSha256OidValue)) != 0)) {
+ (CompareMem (SigData + 13, &mSha256OidValue, sizeof (mSha256OidValue)) != 0 &&
+ CompareMem (SigData + 32, &mSha256OidValue, sizeof (mSha256OidValue)) != 0)) {
return EFI_SECURITY_VIOLATION;
}
}
--
2.13.6
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] SecurityPkg: fix sha256 signature check
2018-05-09 22:09 [PATCH] SecurityPkg: fix sha256 signature check James Bottomley
@ 2018-05-10 12:36 ` Laszlo Ersek
2018-05-11 8:25 ` Long, Qin
0 siblings, 1 reply; 3+ messages in thread
From: Laszlo Ersek @ 2018-05-10 12:36 UTC (permalink / raw)
To: James Bottomley, edk2-devel@lists.01.org; +Cc: Zhang Lubo
On 05/10/18 00:09, James Bottomley wrote:
> commit c035e37335ae43229d7e68de74a65f2c01ebc0af
> Author: Zhang Lubo <lubo.zhang@intel.com>
> Date: Thu Jan 5 14:58:05 2017 +0800
>
> SecurityPkg: enhance secure boot Config Dxe & Time Based AuthVariable.
>
> Added a check for sha256 being the ownly allowed signature hash.
> Unfortuantely this commit assumed the form of the signature data was a
> raw SignedData sequence. Most tools actually generate a ContentInfo
> sequence instead which contains a header identifying the content as
> pkcs7-SignedData. Fix this check to allow either format to work.
>
> This fix is needed at least for efitools because we generate signed
> variable updates with the ContentInfo header.
>
> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
> ---
> CryptoPkg/Library/OpensslLib/openssl | 2 +-
> SecurityPkg/Library/AuthVariableLib/AuthService.c | 11 ++++++++++-
> 2 files changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/CryptoPkg/Library/OpensslLib/openssl b/CryptoPkg/Library/OpensslLib/openssl
> index b2758a2292..d4e4bd2a81 160000
> --- a/CryptoPkg/Library/OpensslLib/openssl
> +++ b/CryptoPkg/Library/OpensslLib/openssl
> @@ -1 +1 @@
> -Subproject commit b2758a2292aceda93e9f44c219b94fe21bb9a650
> +Subproject commit d4e4bd2a8163f355fa8a3884077eaec7adc75ff7
This hunk should not be necessary; please see edk2 commit b85b20fba42e
("CryptoPkg/OpensslLib: Update OpenSSL version to 1.1.0h", 2018-04-15).
(I'll let the SecurityPkg maintainers review the rest.)
Thanks,
Laszlo
> diff --git a/SecurityPkg/Library/AuthVariableLib/AuthService.c b/SecurityPkg/Library/AuthVariableLib/AuthService.c
> index 213a524f27..855ea3350a 100644
> --- a/SecurityPkg/Library/AuthVariableLib/AuthService.c
> +++ b/SecurityPkg/Library/AuthVariableLib/AuthService.c
> @@ -1908,10 +1908,19 @@ VerifyTimeBasedPayload (
> // in VARIABLE_AUTHENTICATION_2 descriptor.
> // This field has the fixed offset (+13) and be calculated based on two bytes of length encoding.
> //
> + // However the data may also begin
> + // ContentInfo ::= SEQUENCE {
> + // contentType ContentType,
> + // content
> + // [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
> + //
> + // In which case the fixed offset is +32
> + //
> if ((Attributes & EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) != 0) {
> if (SigDataSize >= (13 + sizeof (mSha256OidValue))) {
> if (((*(SigData + 1) & TWO_BYTE_ENCODE) != TWO_BYTE_ENCODE) ||
> - (CompareMem (SigData + 13, &mSha256OidValue, sizeof (mSha256OidValue)) != 0)) {
> + (CompareMem (SigData + 13, &mSha256OidValue, sizeof (mSha256OidValue)) != 0 &&
> + CompareMem (SigData + 32, &mSha256OidValue, sizeof (mSha256OidValue)) != 0)) {
> return EFI_SECURITY_VIOLATION;
> }
> }
>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] SecurityPkg: fix sha256 signature check
2018-05-10 12:36 ` Laszlo Ersek
@ 2018-05-11 8:25 ` Long, Qin
0 siblings, 0 replies; 3+ messages in thread
From: Long, Qin @ 2018-05-11 8:25 UTC (permalink / raw)
To: Laszlo Ersek, James Bottomley, edk2-devel@lists.01.org; +Cc: Zhang Lubo
> -----Original Message-----
> From: edk2-devel [mailto:edk2-devel-bounces@lists.01.org] On Behalf Of
> Laszlo Ersek
> Sent: Thursday, May 10, 2018 8:36 PM
> To: James Bottomley <James.Bottomley@HansenPartnership.com>; edk2-
> devel@lists.01.org
> Cc: Zhang Lubo <lubo.zhang@intel.com>
> Subject: Re: [edk2] [PATCH] SecurityPkg: fix sha256 signature check
>
> On 05/10/18 00:09, James Bottomley wrote:
> > commit c035e37335ae43229d7e68de74a65f2c01ebc0af
> > Author: Zhang Lubo <lubo.zhang@intel.com>
> > Date: Thu Jan 5 14:58:05 2017 +0800
> >
> > SecurityPkg: enhance secure boot Config Dxe & Time Based AuthVariable.
> >
> > Added a check for sha256 being the ownly allowed signature hash.
> > Unfortuantely this commit assumed the form of the signature data was a
> > raw SignedData sequence. Most tools actually generate a ContentInfo
> > sequence instead which contains a header identifying the content as
> > pkcs7-SignedData. Fix this check to allow either format to work.
> >
> > This fix is needed at least for efitools because we generate signed
> > variable updates with the ContentInfo header.
> >
> > Signed-off-by: James Bottomley
> <James.Bottomley@HansenPartnership.com>
> > ---
> > CryptoPkg/Library/OpensslLib/openssl | 2 +-
> > SecurityPkg/Library/AuthVariableLib/AuthService.c | 11 ++++++++++-
> > 2 files changed, 11 insertions(+), 2 deletions(-)
> >
> > diff --git a/CryptoPkg/Library/OpensslLib/openssl
> > b/CryptoPkg/Library/OpensslLib/openssl
> > index b2758a2292..d4e4bd2a81 160000
> > --- a/CryptoPkg/Library/OpensslLib/openssl
> > +++ b/CryptoPkg/Library/OpensslLib/openssl
> > @@ -1 +1 @@
> > -Subproject commit b2758a2292aceda93e9f44c219b94fe21bb9a650
> > +Subproject commit d4e4bd2a8163f355fa8a3884077eaec7adc75ff7
>
> This hunk should not be necessary; please see edk2 commit b85b20fba42e
> ("CryptoPkg/OpensslLib: Update OpenSSL version to 1.1.0h", 2018-04-15).
>
> (I'll let the SecurityPkg maintainers review the rest.)
>
> Thanks,
> Laszlo
[Long, Qin] I think so.
OpenSSL submodule was already upgraded to 1.1.0h (d4e4bd2a8...)
>
> > diff --git a/SecurityPkg/Library/AuthVariableLib/AuthService.c
> > b/SecurityPkg/Library/AuthVariableLib/AuthService.c
> > index 213a524f27..855ea3350a 100644
> > --- a/SecurityPkg/Library/AuthVariableLib/AuthService.c
> > +++ b/SecurityPkg/Library/AuthVariableLib/AuthService.c
> > @@ -1908,10 +1908,19 @@ VerifyTimeBasedPayload (
> > // in VARIABLE_AUTHENTICATION_2 descriptor.
> > // This field has the fixed offset (+13) and be calculated based on two
> bytes of length encoding.
> > //
> > + // However the data may also begin
> > + // ContentInfo ::= SEQUENCE {
> > + // contentType ContentType,
> > + // content
> > + // [0] EXPLICIT ANY DEFINED BY contentType OPTIONAL }
> > + //
> > + // In which case the fixed offset is +32 //
> > if ((Attributes &
> EFI_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS) != 0) {
> > if (SigDataSize >= (13 + sizeof (mSha256OidValue))) {
> > if (((*(SigData + 1) & TWO_BYTE_ENCODE) != TWO_BYTE_ENCODE) ||
> > - (CompareMem (SigData + 13, &mSha256OidValue, sizeof
> (mSha256OidValue)) != 0)) {
> > + (CompareMem (SigData + 13, &mSha256OidValue, sizeof
> (mSha256OidValue)) != 0 &&
> > + CompareMem (SigData + 32, &mSha256OidValue, sizeof
> > +(mSha256OidValue)) != 0)) {
> > return EFI_SECURITY_VIOLATION;
> > }
> > }
> >
[Long, Qin] This part looks good to me.
I prefer to add this to make both formats (with or without contentType) to work.
>
> _______________________________________________
> edk2-devel mailing list
> edk2-devel@lists.01.org
> https://lists.01.org/mailman/listinfo/edk2-devel
^ permalink raw reply [flat|nested] 3+ messages in thread
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