1tpm2_send(1) General Commands Manual tpm2_send(1)
2
6 tpm2_send(1) - Send a raw command buffer to the TPM.
7
9 tpm2_send [OPTIONS] [STDIN]
10
12 tpm2_send(1) - Sends a TPM command to the TPM. The command is read
13 from a file as a binary stream and transmitted to the TPM using the TC‐
14 TI specified by the caller. The response received from the TPM is
15 written to the output file.
16 Likely the caller will want to redirect this to a file or into a pro‐
18 gram to decode and display the response in a human readable form.
19
21 • -o, --output=FILE:
22 Output file to send response buffer to. Defaults to STDOUT.
24 • **_STDIN** the file containing the TPM2 command.
26 References
29 This collection of options are common to many programs and provide in‐
30 formation that many users may expect.
31 • -h, --help=[man|no-man]: Display the tools manpage. By default, it
33 attempts to invoke the manpager for the tool, however, on failure
34 will output a short tool summary. This is the same behavior if the
35 “man” option argument is specified, however if explicit “man” is re‐
36 quested, the tool will provide errors from man on stderr. If the
37 “no-man” option if specified, or the manpager fails, the short op‐
38 tions will be output to stdout.
39 To successfully use the manpages feature requires the manpages to be
41 installed or on MANPATH, See man(1) for more details.
42 • -v, --version: Display version information for this tool, supported
44 tctis and exit.
45 • -V, --verbose: Increase the information that the tool prints to the
47 console during its execution. When using this option the file and
48 line number are printed.
49 • -Q, --quiet: Silence normal tool output to stdout.
51 • -Z, --enable-errata: Enable the application of errata fixups. Useful
53 if an errata fixup needs to be applied to commands sent to the TPM.
54 Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent. in‐
55 formation many users may expect.
56
58 The TCTI or “Transmission Interface” is the communication mechanism
59 with the TPM. TCTIs can be changed for communication with TPMs across
60 different mediums.
61 To control the TCTI, the tools respect:
63 1. The command line option -T or --tcti
65 2. The environment variable: TPM2TOOLS_TCTI.
67 Note: The command line option always overrides the environment vari‐
69 able.
70 The current known TCTIs are:
72 • tabrmd - The resource manager, called tabrmd
74 (https://github.com/tpm2-software/tpm2-abrmd). Note that tabrmd and
75 abrmd as a tcti name are synonymous.
76 • mssim - Typically used for communicating to the TPM software simula‐
78 tor.
79 • device - Used when talking directly to a TPM device file.
81 • none - Do not initalize a connection with the TPM. Some tools allow
83 for off-tpm options and thus support not using a TCTI. Tools that do
84 not support it will error when attempted to be used without a TCTI
85 connection. Does not support ANY options and MUST BE presented as
86 the exact text of “none”.
87 The arguments to either the command line option or the environment
89 variable are in the form:
90 <tcti-name>:<tcti-option-config>
92 Specifying an empty string for either the <tcti-name> or <tcti-op‐
94 tion-config> results in the default being used for that portion respec‐
95 tively.
96 TCTI Defaults
98 When a TCTI is not specified, the default TCTI is searched for using
99 dlopen(3) semantics. The tools will search for tabrmd, device and
100 mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query
101 what TCTI will be chosen as the default by using the -v option to print
102 the version information. The “default-tcti” key-value pair will indi‐
103 cate which of the aforementioned TCTIs is the default.
104 Custom TCTIs
106 Any TCTI that implements the dynamic TCTI interface can be loaded. The
107 tools internally use dlopen(3), and the raw tcti-name value is used for
108 the lookup. Thus, this could be a path to the shared library, or a li‐
109 brary name as understood by dlopen(3) semantics.
110
112 This collection of options are used to configure the various known TCTI
113 modules available:
114 • device: For the device TCTI, the TPM character device file for use by
116 the device TCTI can be specified. The default is /dev/tpm0.
117 Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI=“de‐
119 vice:/dev/tpm0”
120 • mssim: For the mssim TCTI, the domain name or IP address and port
122 number used by the simulator can be specified. The default are
123 127.0.0.1 and 2321.
124 Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TC‐
126 TI=“mssim:host=localhost,port=2321”
127 • abrmd: For the abrmd TCTI, the configuration string format is a se‐
129 ries of simple key value pairs separated by a `,' character. Each
130 key and value string are separated by a `=' character.
131 • TCTI abrmd supports two keys:
133 1. `bus_name' : The name of the tabrmd service on the bus (a
135 string).
136 2. `bus_type' : The type of the dbus instance (a string) limited to
138 `session' and `system'.
139 Specify the tabrmd tcti name and a config string of bus_name=com.ex‐
141 ample.FooBar:
142 \--tcti=tabrmd:bus_name=com.example.FooBar
144 Specify the default (abrmd) tcti and a config string of bus_type=ses‐
146 sion:
147 \--tcti:bus_type=session
149 NOTE: abrmd and tabrmd are synonymous. the various known TCTI mod‐
151 ules.
152
154 Send and receive raw commands to TPM
155 Send the contents of tpm2-command.bin to a device and collect the re‐
156 sponse as tpm2-response.bin.
157 tpm2_send < tpm2-command.bin > tpm2-response.bin
159 tpm2_send < tpm2-command.bin -o tpm2-response.bin
161
163 Tools can return any of the following codes:
164 • 0 - Success.
166 • 1 - General non-specific error.
168 • 2 - Options handling error.
170 • 3 - Authentication error.
172 • 4 - TCTI related error.
174 • 5 - Non supported scheme. Applicable to tpm2_testparams.
176
178 Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
179
181 See the Mailing List (https://lists.linuxfoundation.org/mailman/listin‐
182 fo/tpm2)
183tpm2-tools tpm2_send(1)