1tpm2_nvreadpublic(1) General Commands Manual tpm2_nvreadpublic(1)
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6 tpm2_nvreadpublic(1) - Display all defined Non-Volatile (NV)s indices.
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9 tpm2_nvreadpublic [OPTIONS]
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12 tpm2_nvreadpublic(1) - Display all defined Non-Volatile (NV)s indices
13 to stdout in a YAML format.
14 Display metadata for all defined NV indices. Metadata includes:
16 · The size of the defined region.
18 · The hash algorithm used to compute the name of the index.
20 · The auth policy.
22 · The NV attributes as defined in section "NV Attributes".
24 Example Output
26 ``` 0x1500015: hash algorithm: friendly: sha256 value: 0xB attributes:
27 friendly: ownerwrite|ownerread value: 0x2000200 size: 32 authorization
28 policy:
29 0x1500017: hash algorithm: friendly: sha256 value: 0xB attributes:
31 friendly: ownerwrite|ownerread value: 0x2000200 size: 32 authorization
32 policy: ```
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35 This tool takes no tool specific options.
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38 This collection of options are common to many programs and provide in‐
39 formation that many users may expect.
40 · -h, --help=[man|no-man]: Display the tools manpage. By default, it
42 attempts to invoke the manpager for the tool, however, on failure
43 will output a short tool summary. This is the same behavior if the
44 "man" option argument is specified, however if explicit "man" is re‐
45 quested, the tool will provide errors from man on stderr. If the
46 "no-man" option if specified, or the manpager fails, the short op‐
47 tions will be output to stdout.
48 To successfully use the manpages feature requires the manpages to be
50 installed or on MANPATH, See man(1) for more details.
51 · -v, --version: Display version information for this tool, supported
53 tctis and exit.
54 · -V, --verbose: Increase the information that the tool prints to the
56 console during its execution. When using this option the file and
57 line number are printed.
58 · -Q, --quiet: Silence normal tool output to stdout.
60 · -Z, --enable-errata: Enable the application of errata fixups. Useful
62 if an errata fixup needs to be applied to commands sent to the TPM.
63 Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent.
64
66 The TCTI or "Transmission Interface" is the communication mechanism
67 with the TPM. TCTIs can be changed for communication with TPMs across
68 different mediums.
69 To control the TCTI, the tools respect:
71 1. The command line option -T or --tcti
73 2. The environment variable: TPM2TOOLS_TCTI.
75 Note: The command line option always overrides the environment vari‐
77 able.
78 The current known TCTIs are:
80 · tabrmd - The resource manager, called tabrmd
82 (https://github.com/tpm2-software/tpm2-abrmd). Note that tabrmd and
83 abrmd as a tcti name are synonymous.
84 · mssim - Typically used for communicating to the TPM software simula‐
86 tor.
87 · device - Used when talking directly to a TPM device file.
89 · none - Do not initalize a connection with the TPM. Some tools allow
91 for off-tpm options and thus support not using a TCTI. Tools that do
92 not support it will error when attempted to be used without a TCTI
93 connection. Does not support ANY options and MUST BE presented as
94 the exact text of "none".
95 The arguments to either the command line option or the environment
97 variable are in the form:
98 <tcti-name>:<tcti-option-config>
100 Specifying an empty string for either the <tcti-name> or <tcti-op‐
102 tion-config> results in the default being used for that portion respec‐
103 tively.
104 TCTI Defaults
106 When a TCTI is not specified, the default TCTI is searched for using
107 dlopen(3) semantics. The tools will search for tabrmd, device and
108 mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query
109 what TCTI will be chosen as the default by using the -v option to print
110 the version information. The "default-tcti" key-value pair will indi‐
111 cate which of the aforementioned TCTIs is the default.
112 Custom TCTIs
114 Any TCTI that implements the dynamic TCTI interface can be loaded. The
115 tools internally use dlopen(3), and the raw tcti-name value is used for
116 the lookup. Thus, this could be a path to the shared library, or a li‐
117 brary name as understood by dlopen(3) semantics.
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120 This collection of options are used to configure the various known TCTI
121 modules available:
122 · device: For the device TCTI, the TPM character device file for use by
124 the device TCTI can be specified. The default is /dev/tpm0.
125 Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI="de‐
127 vice:/dev/tpm0"
128 · mssim: For the mssim TCTI, the domain name or IP address and port
130 number used by the simulator can be specified. The default are
131 127.0.0.1 and 2321.
132 Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TC‐
134 TI="mssim:host=localhost,port=2321"
135 · abrmd: For the abrmd TCTI, the configuration string format is a se‐
137 ries of simple key value pairs separated by a ',' character. Each
138 key and value string are separated by a '=' character.
139 · TCTI abrmd supports two keys:
141 1. 'bus_name' : The name of the tabrmd service on the bus (a
143 string).
144 2. 'bus_type' : The type of the dbus instance (a string) limited to
146 'session' and 'system'.
147 Specify the tabrmd tcti name and a config string of bus_name=com.ex‐
149 ample.FooBar:
150 \--tcti=tabrmd:bus_name=com.example.FooBar
152 Specify the default (abrmd) tcti and a config string of bus_type=ses‐
154 sion:
155 \--tcti:bus_type=session
157 NOTE: abrmd and tabrmd are synonymous.
159
161 NV Attributes are used to control various properties of the NV defined
162 space. When specified as an option, either the raw bitfield mask or
163 "nice-names" may be used. The values can be found in Table 204 Part 2
164 of the TPM2.0 specification, which can be found here:
165 <https://trustedcomputinggroup.org/wp-content/uploads/TPM-
167 Rev-2.0-Part-2-Structures-01.38.pdf>
168 Nice names are calculated by taking the name field of table 204 and re‐
170 moving the prefix TPMA_NV_ and lowercasing the result. Thus, TP‐
171 MA_NV_PPWRITE becomes ppwrite. Nice names can be joined using the bit‐
172 wise or "|" symbol.
173 Note that the TPM_NT field is 4 bits wide, and thus can be set via nt=
175 format. For instance, to set The fields TPMA_NV_OWNERREAD, TP‐
176 MA_NV_OWNERWRITE, TPMA_NV_POLICYWRITE, and TPMA_NT = 0x3, the argument
177 would be:
178 ownerread|ownerwrite|policywrite|nt=0x3
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182 List the defined NV indices to stdout
183 tpm2_nvreadpublic
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186 Tools can return any of the following codes:
187 · 0 - Success.
189 · 1 - General non-specific error.
191 · 2 - Options handling error.
193 · 3 - Authentication error.
195 · 4 - TCTI related error.
197 · 5 - Non supported scheme. Applicable to tpm2_testparams.
199
201 Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
202
204 See the Mailing List (https://lists.01.org/mailman/listinfo/tpm2)
205tpm2-tools tpm2_nvreadpublic(1)