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| // Copyright (c) 2017 Finnbarr P. Murphy. All rights reserved. | ||
| // | ||
| // Retrieve and print TPM 2.0 PCR digests | ||
| // | ||
| // License: BSD License | ||
| // | ||
| // Routines containing an underbar in the name were ported from Intel Open Source Technology | ||
| // Center tpm2.0-tools and modified for UDK2015 environment and my requirements. | ||
| // | ||
| // Original tpm2.0-tools license is: | ||
| // | ||
| // Copyright (c) 2015, Intel Corporation | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without | ||
| // modification, are permitted provided that the following conditions are met: | ||
| // | ||
| // * Redistributions of source code must retain the above copyright notice, | ||
| // this list of conditions and the following disclaimer. | ||
| // * Redistributions in binary form must reproduce the above copyright | ||
| // notice, this list of conditions and the following disclaimer in the | ||
| // documentation and/or other materials provided with the distribution. | ||
| // * Neither the name of Intel Corporation nor the names of its contributors | ||
| // may be used to endorse or promote products derived from this software | ||
| // without specific prior written permission. | ||
| // | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" | ||
| // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | ||
| // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | ||
| // DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE | ||
| // FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | ||
| // DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | ||
| // SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER | ||
| // CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, | ||
| // OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| // |
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| # ShowPCR | ||
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| This program will print out the PCR values while in the EFI shell. | ||
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| By default this program will output PCR7 as a SHA256 digest with no options, use options below to specify PCR and hash algorithm. | ||
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| Usage: ShowPCR.efi [-all] [--pcr] [n] digest_algorithm | ||
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| --all : Shows all PCR values from 0-23 | ||
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| --pcr : pick an individual PCR value to output | ||
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| ## Build instructions | ||
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| ## Prerequisites | ||
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| Use apt to get the following packages | ||
| ``` | ||
| sudo apt-get install build-essential git uuid-dev iasl nasm | ||
| ``` | ||
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| ### Preparing EDK2 | ||
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| 1) Clone EDK2 into your favorite location and cd into it, I prefer my home directory | ||
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| ``` | ||
| git clone https://github.com/tianocore/edk2.git && cd edk2 | ||
| ``` | ||
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| 2) Clone submodules, make EDK2, and then setup | ||
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| ``` | ||
| git submodule update --init | ||
| make -C BaseTools | ||
| source edksetup.sh | ||
| ``` | ||
| 3) We now must now configure our build settings, using your favorite text editor navigate Conf/target | ||
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| On line 44 Set: | ||
| ``` | ||
| TARGET_ARCH = X64 | ||
| ``` | ||
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| ...then on line 54 set: | ||
| ``` | ||
| TOOL_CHAIN_TAG = GCC5 | ||
| ``` | ||
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| Congrats! Your EDK2 setup is now complete, now on to building ShowPCR! | ||
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| ## Build ShowPCR | ||
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| 1) Prep our build enviornment variables | ||
| ``` | ||
| export EDK_TOOLS_PATH=<edk2_root>/BaseTools | ||
| source edksetup.sh BaseTools | ||
| ``` | ||
| 2) Navigate to the following and clone ShowPCR | ||
| ``` | ||
| cd <edk2 root>/EmulatorPkg/Application | ||
| git clone https://aci-github.cisco.com/atom/showpcr | ||
| ``` | ||
| 3) Add our inf file to the Package Interface using your favorite text editor: | ||
| ``` | ||
| <edk2_root>/EmulatorPkg/EmulatorPkg.dsc | ||
| ``` | ||
| Just past the "Entry Point" section of Libaray Classes add the following | ||
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| ``` | ||
| ShellCEntryLib|ShellPkg/Library/UefiShellCEntryLib/UefiShellCEntryLib.inf | ||
| ``` | ||
| and after the "LibraryClasses" section (ln 416) add the following: | ||
| ``` | ||
| EmulatorPkg/Application/showpcr/showpcr.inf | ||
| ``` | ||
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| ...and finally run the command | ||
| ``` | ||
| build | ||
| ``` | ||
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| showpcr will now be located in <edk2_root>/Build/EmulatorX64/DEBUG_GCC5/X64/showpcr.efi | ||
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