1tpm2_getpolicydigest(1) General Commands Manual tpm2_getpolicydigest(1)
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6 tpm2_getpolicydigest(1) - Retrieves the policy digest from session.
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9 tpm2_getpolicydigest [OPTIONS] [ARGUMENT]
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12 tpm2_getpolicydigest(1) - Returns the policydigest of a session.
13 Output defaults to stdout and binary format unless otherwise specified
15 with -o and –hex options respectively.
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18 • -o, --output=FILE
19 Specifies the filename to output the raw bytes to. Defaults to std‐
21 out as a hex string.
22 • --hex
24 Convert the output data to hex format without a leading “0x”.
26 • -S, --session=FILE:
28 The session created using tpm2_startauthsession.
30 References
33 This collection of options are common to many programs and provide in‐
34 formation that many users may expect.
35 • -h, --help=[man|no-man]: Display the tools manpage. By default, it
37 attempts to invoke the manpager for the tool, however, on failure
38 will output a short tool summary. This is the same behavior if the
39 “man” option argument is specified, however if explicit “man” is re‐
40 quested, the tool will provide errors from man on stderr. If the
41 “no-man” option if specified, or the manpager fails, the short op‐
42 tions will be output to stdout.
43 To successfully use the manpages feature requires the manpages to be
45 installed or on MANPATH, See man(1) for more details.
46 • -v, --version: Display version information for this tool, supported
48 tctis and exit.
49 • -V, --verbose: Increase the information that the tool prints to the
51 console during its execution. When using this option the file and
52 line number are printed.
53 • -Q, --quiet: Silence normal tool output to stdout.
55 • -Z, --enable-errata: Enable the application of errata fixups. Useful
57 if an errata fixup needs to be applied to commands sent to the TPM.
58 Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent. in‐
59 formation many users may expect.
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62 The TCTI or “Transmission Interface” is the communication mechanism
63 with the TPM. TCTIs can be changed for communication with TPMs across
64 different mediums.
65 To control the TCTI, the tools respect:
67 1. The command line option -T or --tcti
69 2. The environment variable: TPM2TOOLS_TCTI.
71 Note: The command line option always overrides the environment vari‐
73 able.
74 The current known TCTIs are:
76 • tabrmd - The resource manager, called tabrmd
78 (https://github.com/tpm2-software/tpm2-abrmd). Note that tabrmd and
79 abrmd as a tcti name are synonymous.
80 • mssim - Typically used for communicating to the TPM software simula‐
82 tor.
83 • device - Used when talking directly to a TPM device file.
85 • none - Do not initalize a connection with the TPM. Some tools allow
87 for off-tpm options and thus support not using a TCTI. Tools that do
88 not support it will error when attempted to be used without a TCTI
89 connection. Does not support ANY options and MUST BE presented as
90 the exact text of “none”.
91 The arguments to either the command line option or the environment
93 variable are in the form:
94 <tcti-name>:<tcti-option-config>
96 Specifying an empty string for either the <tcti-name> or <tcti-op‐
98 tion-config> results in the default being used for that portion respec‐
99 tively.
100 TCTI Defaults
102 When a TCTI is not specified, the default TCTI is searched for using
103 dlopen(3) semantics. The tools will search for tabrmd, device and
104 mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query
105 what TCTI will be chosen as the default by using the -v option to print
106 the version information. The “default-tcti” key-value pair will indi‐
107 cate which of the aforementioned TCTIs is the default.
108 Custom TCTIs
110 Any TCTI that implements the dynamic TCTI interface can be loaded. The
111 tools internally use dlopen(3), and the raw tcti-name value is used for
112 the lookup. Thus, this could be a path to the shared library, or a li‐
113 brary name as understood by dlopen(3) semantics.
114
116 This collection of options are used to configure the various known TCTI
117 modules available:
118 • device: For the device TCTI, the TPM character device file for use by
120 the device TCTI can be specified. The default is /dev/tpm0.
121 Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI=“de‐
123 vice:/dev/tpm0”
124 • mssim: For the mssim TCTI, the domain name or IP address and port
126 number used by the simulator can be specified. The default are
127 127.0.0.1 and 2321.
128 Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TC‐
130 TI=“mssim:host=localhost,port=2321”
131 • abrmd: For the abrmd TCTI, the configuration string format is a se‐
133 ries of simple key value pairs separated by a `,' character. Each
134 key and value string are separated by a `=' character.
135 • TCTI abrmd supports two keys:
137 1. `bus_name' : The name of the tabrmd service on the bus (a
139 string).
140 2. `bus_type' : The type of the dbus instance (a string) limited to
142 `session' and `system'.
143 Specify the tabrmd tcti name and a config string of bus_name=com.ex‐
145 ample.FooBar:
146 \--tcti=tabrmd:bus_name=com.example.FooBar
148 Specify the default (abrmd) tcti and a config string of bus_type=ses‐
150 sion:
151 \--tcti:bus_type=session
153 NOTE: abrmd and tabrmd are synonymous. the various known TCTI mod‐
155 ules.
156
158 Create a session and retrieve policydigest
159 tpm2 startauthsession -S session.ctx
160 tpm2 policypassword -S session.ctx -L test.policy
161 tpm2 getpolicydigest -S session.ctx -o policy.out
162 tpm2 flushcontext session.ctx
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165 Tools can return any of the following codes:
166 • 0 - Success.
168 • 1 - General non-specific error.
170 • 2 - Options handling error.
172 • 3 - Authentication error.
174 • 4 - TCTI related error.
176 • 5 - Non supported scheme. Applicable to tpm2_testparams.
178
180 Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
181
183 See the Mailing List (https://lists.linuxfoundation.org/mailman/listin‐
184 fo/tpm2)
185tpm2-tools tpm2_getpolicydigest(1)