From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f193.google.com (mail-pf1-f193.google.com [209.85.210.193]) by mx.groups.io with SMTP id smtpd.web10.6935.1597198890985298875 for ; Tue, 11 Aug 2020 19:21:31 -0700 Authentication-Results: mx.groups.io; dkim=pass header.i=@gmail.com header.s=20161025 header.b=Xpqb79GA; spf=pass (domain: gmail.com, ip: 209.85.210.193, mailfrom: matthewfcarlson@gmail.com) Received: by mail-pf1-f193.google.com with SMTP id 17so236209pfw.9 for ; Tue, 11 Aug 2020 19:21:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=lnD2EhsSZ/SkLdqf4oQj5fucvnj6UOtoz5KMgrI5D8A=; b=Xpqb79GAmNLN70k8ZejJJxLwQ7dhqU+ENn97u/DTGprWyBZwCj1mifzJHQ/bjRZG8o UJRJMSaWE2evE1YatGoSVjjSq8lHEEKWyTzoREp6VvOm7S5+1L3Okmxa4NavxFhhq9wU B+gMsLTrkbQyZosb7y5Ll9s5AcNvtmLsMppvwMoKlIoTU0PAu/PGtCutfsmDD6Mq8tr5 WtgT0juGP+eLl8CC9N+5kJpNKeBITR2wc5655mrN5UHGwFJql//09S5IWbMcUL0xPP/b NCIzdDAM+vLjpkgbImSVvNKXIUV+c+J9zajoFjBe8ypPJgEusp+epUhifjWkRXSUdh3H X7uA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=lnD2EhsSZ/SkLdqf4oQj5fucvnj6UOtoz5KMgrI5D8A=; b=cHbC/HPijjNPFzA9mdgbH0YVF0ykVf2bn1rS+HhARUQ6zdANCn1JsTMmJO55qzk2k9 NtyaO26bUAlzLPXZGvg0nfc5nlgmaK/bHEyXve971PqzyB2mJS3X8HvfsYIm0FqzzQj7 I6wNUqRi+I5PG7eGsLt2N+l5WAe8KTIQmAFI+1dnxeojE3R1Xx3VCZCKV4OwApN1Dbwb +yJLTPAFxu/iCsitr0oYcnQAFfPmsiZTo29RFyPRp3juAr++Au0r/Md5WLI2t+7Q3OHQ +TZvwYHBiO5/2+KJH8jRv3p1nLt5JUVAyYG42mF4YLZKW9WErA9SYyioTpzeGam/yIzc crYQ== X-Gm-Message-State: AOAM531skHA95G6tfMClWuV/7x5lvAvthj8CCvwj93Nh5XE2j+425+7X 5Q6Cqwy2DD/yJ5Vlh8/XFYU2nnEaXwxbAA== X-Google-Smtp-Source: ABdhPJwDtXc74pz1bXux4XNX/RFBYMZnNVoKstOZ1OHSByzL8qRZqbsOVmsf5qwYiRG+QoYy7joFCQ== X-Received: by 2002:a65:6289:: with SMTP id f9mr3137623pgv.272.1597198890133; Tue, 11 Aug 2020 19:21:30 -0700 (PDT) Return-Path: Received: from tvis-name-05.localdomain ([50.34.40.129]) by smtp.gmail.com with ESMTPSA id q17sm415952pfh.32.2020.08.11.19.21.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Aug 2020 19:21:29 -0700 (PDT) From: "Matthew Carlson" To: devel@edk2.groups.io Cc: Ard Biesheuvel , Anthony Perard , Jiewen Yao , Jian J Wang , Julien Grall , Jordan Justen , Laszlo Ersek , Liming Gao , Leif Lindholm , Michael D Kinney , Xiaoyu Lu , Zhiguang Liu , Matthew Carlson Subject: [PATCH v5 0/5] Use RngLib instead of TimerLib for OpensslLib Date: Tue, 11 Aug 2020 19:21:22 -0700 Message-Id: <20200812022127.1205-1-matthewfcarlson@gmail.com> X-Mailer: git-send-email 2.27.0.windows.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Matthew Carlson Hello all, This patch contains a fix for Bugzilla 1871. There's been a good bit of community discussion around the topic, so below follows a general overview of the discussion and what this patch does. Back in Devel message#40590 (https://edk2.groups.io/g/devel/message/40590) around the patch series that updates OpenSSL to 1.1.1b, a comment was made that suggested that platforms be in charge of the entropy/randomness that is provided to OpenSSL as currently the entropry source seems to be a hand-rolled random number generator that uses the PerformanceCounter from TimerLib. This causes OpenSSL to depend on TimerLib, which is often platform specific. In addition to being a potentially weaker source of randomness, this also poses a challenge to compile BaseCryptLibOnProtocol with a platform- agnostic version of TimerLib that works universally. The solution here is to allow platform to specify their source of entropy in addition to providing two new RngLibs: one that uses the TimerLib as well as one that uses RngProtocol to provide randomness. Then the decision to use RDRAND or other entropy sources is up to the platform. Mixing various entropy sources is the onus of the platform. It has been suggested on Devel#40590 and BZ#1871 that there should be mixing of the PerformanceCounter and RDRAND using something similar to the yarrow alogirthm that FreeBSD uses for example. This patch series doesn't offer an RngLib that offers that sort of mixing as the ultimate source of random is defined by the platform. This patch series offers three benefits: 1. Dependency reduction: Removes the need for a platform specific timer library. We publish a single binary used on numerous platforms for crypto and the introduced timer lib dependency caused issues because we could not fulfill our platform needs with one library instance. 2. Code maintenance: Removing this additional code and leveraging an existing library within Edk2 means less code to maintain. 3. Platform defined quality: A platform can choose which instance to use and the implications of that instance. This patch series seeks to address five seperate issues. 1) Use RngLib interface to generate random entropy in rand_pool 2) Remove dependency on TimerLib in OpensslLib 3) Add a new version of RngLib implemented by TimerLib 4) Add a new version of RngLib implemented by EFI_RNG_PROTOCOL 5) Add RngLib to platforms in EDK2 such as ArmVirtPkg and OvmfPkg Since this changes the dependencies of OpenSSL, this has the potential of being a breaking change for platforms in edk2-platforms. The easiest solution is just to use the RngLib that uses the TimerLib as this closely mimics the behavior of OpenSSL prior to this patch series. There is also a null version of RngLib for CI environments that need this change (https://edk2.groups.io/g/devel/message/50432). Though it should be pointed out that in CI environments, the null version of BaseCryptLib or OpenSSL should be used. In addition, it has been suggested that 1) Add AsmRdSeed to BaseLib. 2) Update BaseRngLib to use AsmRdSeed() for the random number, if RdSeed is supported (CPUID BIT18) However, this is largely out of scope for this particular patch series and will likely need to be in a follow-up series later. It is my understanding that the OpenSSL code uses the values provided as a randomness pool rather than a seed or random numbers itself, so the requirements for randomness are not quite as stringent as other applications. For the ArmVirtPkg and OvmfPkg platforms, the patch series here just adds in the TimerLib based RngLib as that is similar to the functionality of before. It is added as a common library so any custom RngLib defined in the DSC should take precedence over the TimerLibRngLib. Ref: https://github.com/tianocore/edk2/pull/845 Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1871 Cc: Ard Biesheuvel Cc: Anthony Perard Cc: Jiewen Yao Cc: Jian J Wang Cc: Julien Grall Cc: Jordan Justen Cc: Laszlo Ersek Cc: Liming Gao Cc: Leif Lindholm Cc: Michael D Kinney Cc: Xiaoyu Lu Cc: Zhiguang Liu Signed-off-by: Matthew Carlson Matthew Carlson (5): MdePkg: TimerRngLib: Added RngLib that uses TimerLib MdePkg: BaseRngLibDxe: Add RngLib that uses RngDxe OvmfPkg: Add RngLib based on TimerLib for Crypto ArmVirtPkg: Add RngLib based on TimerLib for CryptoPkg CryptoPkg: OpensslLib: Use RngLib to generate entropy in rand_pool CryptoPkg/Library/OpensslLib/rand_pool.c | 203 ++------------------ CryptoPkg/Library/OpensslLib/rand_pool_noise.c | 29 --- CryptoPkg/Library/OpensslLib/rand_pool_noise_tsc.c | 43 ----- MdePkg/Library/BaseRngLibDxe/RngDxeLib.c | 200 +++++++++++++++++++ MdePkg/Library/BaseRngLibTimerLib/RngLibTimer.c | 187 ++++++++++++++++++ ArmVirtPkg/ArmVirt.dsc.inc | 1 + CryptoPkg/CryptoPkg.dsc | 1 + CryptoPkg/Library/OpensslLib/OpensslLib.inf | 15 +- CryptoPkg/Library/OpensslLib/OpensslLibCrypto.inf | 15 +- CryptoPkg/Library/OpensslLib/rand_pool_noise.h | 29 --- MdePkg/Library/BaseRngLibDxe/BaseRngLibDxe.inf | 38 ++++ MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.inf | 40 ++++ MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.uni | 17 ++ MdePkg/MdePkg.dsc | 5 +- OvmfPkg/Bhyve/BhyvePkgX64.dsc | 1 + OvmfPkg/OvmfPkgIa32.dsc | 1 + OvmfPkg/OvmfPkgIa32X64.dsc | 2 + OvmfPkg/OvmfPkgX64.dsc | 1 + OvmfPkg/OvmfXen.dsc | 1 + 19 files changed, 515 insertions(+), 314 deletions(-) delete mode 100644 CryptoPkg/Library/OpensslLib/rand_pool_noise.c delete mode 100644 CryptoPkg/Library/OpensslLib/rand_pool_noise_tsc.c create mode 100644 MdePkg/Library/BaseRngLibDxe/RngDxeLib.c create mode 100644 MdePkg/Library/BaseRngLibTimerLib/RngLibTimer.c delete mode 100644 CryptoPkg/Library/OpensslLib/rand_pool_noise.h create mode 100644 MdePkg/Library/BaseRngLibDxe/BaseRngLibDxe.inf create mode 100644 MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.inf create mode 100644 MdePkg/Library/BaseRngLibTimerLib/BaseRngLibTimerLib.uni -- 2.27.0.windows.1