| 1 | What is libtpms?
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| 2 | ----------------
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| 3 |
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| 4 | Libtpms is a library that targets the integration of TPM functionality
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| 5 | into hypervisors, primarily into Qemu. Libtpms provides a very narrow
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| 6 | public API for this purpose so that integration is possible. Only the
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| 7 | minimum of necessary APIs are made publicly available.
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| 8 |
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| 9 | It is assumed that the user of libtpms is familiar with the concepts
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| 10 | of the Trusted Platform Module (TPM). For the interaction with libtpms
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| 11 | it is necessary to know how to construct valid TPM commands and to
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| 12 | be able to parse their results. It is not within the scope of libtpms's
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| 13 | documentation to provide background on this. See the section on references
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| 14 | below.
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| 15 |
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| 16 |
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| 17 | What files does the libtpms package provide?
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| 18 | --------------------------------------------
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| 19 |
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| 20 | The main libtpms package provides the following files:
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| 21 |
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| 22 | /usr/lib64/libtpms.so.0
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| 23 | /usr/lib64/libtpms.so.0.5.1
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| 24 | /usr/share/doc/libtpms-0.5.1
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| 25 | /usr/share/doc/libtpms-0.5.1/CHANGES
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| 26 | /usr/share/doc/libtpms-0.5.1/LICENSE
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| 27 | /usr/share/doc/libtpms-0.5.1/README
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| 28 |
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| 29 | Applications can link with -ltpms.
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| 30 |
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| 31 |
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| 32 | What files does the libtpms development package provide?
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| 33 | --------------------------------------------------------
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| 34 |
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| 35 | The libtpms development package (libtpms-devel) provides the following
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| 36 | include files for applications to use:
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| 37 |
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| 38 | tpm_error.h
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| 39 | tpm_library.h
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| 40 | tpm_memory.h
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| 41 | tpm_nvfilename.h
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| 42 | tpm_tis.h
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| 43 | tpm_types.h
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| 44 |
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| 45 | These files contain the data structures, data types and API calls supported
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| 46 | by libtpms. It is recommended to not use any other API calls than those
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| 47 | provided in these include files.
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| 48 |
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| 49 | All APIs are described in man pages. The man pages are part of the libtpms
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| 50 | development package as well:
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| 51 |
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| 52 | TPMLIB_DecodeBlob
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| 53 | TPMLIB_GetTPMProperty
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| 54 | TPMLIB_GetVersion
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| 55 | TPMLIB_MainInit
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| 56 | TPMLIB_Process
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| 57 | TPMLIB_RegisterCallbacks
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| 58 | TPMLIB_Terminate
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| 59 | TPMLIB_VolatileAll_Store
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| 60 | TPM_Free
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| 61 | TPM_IO_Hash_Data
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| 62 | TPM_IO_Hash_End
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| 63 | TPM_IO_Hash_Start
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| 64 | TPM_IO_TpmEstablished_Get
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| 65 | TPM_Malloc
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| 66 | TPM_Realloc
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| 67 |
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| 68 |
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| 69 | How to contribute?
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| 70 | ------------------
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| 71 | The mailing list for libtpms is [email protected].
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| 72 |
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| 73 | For patch submissions, please use a Signed-off-by: <your email> to indicate
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| 74 | agreement to the DCO1.1.txt.
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| 75 |
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| 76 |
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| 77 | Fuzzing
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| 78 | -------
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| 79 | Initial fuzzing is possible with clang & libfuzzer.
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| 80 |
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| 81 | You have to configure the project with --enable-fuzzer
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| 82 | (--enable-sanitizer can also help spot more issues). Then you can
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| 83 | build fuzz and run it with the testing corpus.
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| 84 |
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| 85 | Fuzz testing is known to work with Fedora 28 or later. It requires that the
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| 86 | 'clang' package is installed.
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| 87 |
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| 88 | Ex:
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| 89 | $ ./configure --with-openssl --with-tpm2 --enable-sanitizers --enable-fuzzer \
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| 90 | CC=clang CXX=clang++
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| 91 | $ make && make -C tests fuzz
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| 92 | $ tests/run-fuzzer.sh
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| 93 |
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| 94 | oss-fuzz builds with its own fuzzer flags, and set $LIB_FUZZING_ENGINE
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| 95 | to be linked with. The script run by oss-fuzz is tests/oss-fuzz.sh.
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| 96 |
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| 97 | Maintainers
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| 98 | -----------
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| 99 | libtpms is currently being maintained by Stefan Berger <[email protected]>.
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| 100 |
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| 101 | References:
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| 102 | -----------
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| 103 |
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| 104 | Documentation about the Trusted Platform Module (TPM) can be downloaded
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| 105 | from the Trusted Computing Group's website at
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| 106 |
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| 107 | http://www.trustedcomputinggroup.org
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