Provided by: tpm2-tools_5.7-1_amd64 
NAME
tpm2_policycommandcode(1) - Restrict TPM object authorization to specific TPM commands.
SYNOPSIS
tpm2_policycommandcode [OPTIONS] [ARGUMENT]
DESCRIPTION
tpm2_policycommandcode(1) - Restricts TPM object authorization to specific TPM commands. Useful when you
want to allow only specific commands to interact with the TPM object.
As an argument it takes the command as an integer or friendly string value. Friendly string to COMMAND
CODE mapping can be found in section COMMAND CODE MAPPINGS.
OPTIONS
• -S, --session=FILE:
A session file from tpm2_startauthsession(1)’s -S option.
• -L, --policy=FILE:
File to save the policy digest.
• ARGUMENT the command line argument specifies TPM2 command code.
• --cphash=FILE
File path to record the hash of the command parameters. This is commonly termed as cpHash. NOTE: When
this option is selected, The tool will not actually execute the command, it simply returns a cpHash.
References
COMMON OPTIONS
This collection of options are common to many programs and provide information that many users may ex‐
pect.
• -h, --help=[man|no-man]: Display the tools manpage. By default, it attempts to invoke the manpager for
the tool, however, on failure will output a short tool summary. This is the same behavior if the “man”
option argument is specified, however if explicit “man” is requested, the tool will provide errors from
man on stderr. If the “no-man” option if specified, or the manpager fails, the short options will be
output to stdout.
To successfully use the manpages feature requires the manpages to be installed or on MANPATH, See
man(1) for more details.
• -v, --version: Display version information for this tool, supported tctis and exit.
• -V, --verbose: Increase the information that the tool prints to the console during its execution. When
using this option the file and line number are printed.
• -Q, --quiet: Silence normal tool output to stdout.
• -Z, --enable-errata: Enable the application of errata fixups. Useful if an errata fixup needs to be
applied to commands sent to the TPM. Defining the environment TPM2TOOLS_ENABLE_ERRATA is equivalent.
• -R, --autoflush: Enable autoflush for transient objects created by the command. If a parent object is
loaded from a context file also the transient parent object will be flushed. Autoflush can also be ac‐
tivated if the environment variable TPM2TOOLS_AUTOFLUSH is is set to yes or true. information many
users may expect.
TCTI Configuration
The TCTI or “Transmission Interface” is the communication mechanism with the TPM. TCTIs can be changed
for communication with TPMs across different mediums.
To control the TCTI, the tools respect:
1. The command line option -T or --tcti
2. The environment variable: TPM2TOOLS_TCTI.
Note: The command line option always overrides the environment variable.
The current known TCTIs are:
• tabrmd - The resource manager, called tabrmd (https://github.com/tpm2-software/tpm2-abrmd). Note that
tabrmd and abrmd as a tcti name are synonymous.
• mssim - Typically used for communicating to the TPM software simulator.
• device - Used when talking directly to a TPM device file.
• none - Do not initalize a connection with the TPM. Some tools allow for off-tpm options and thus sup‐
port not using a TCTI. Tools that do not support it will error when attempted to be used without a TC‐
TI connection. Does not support ANY options and MUST BE presented as the exact text of “none”.
The arguments to either the command line option or the environment variable are in the form:
<tcti-name>:<tcti-option-config>
Specifying an empty string for either the <tcti-name> or <tcti-option-config> results in the default be‐
ing used for that portion respectively.
TCTI Defaults
When a TCTI is not specified, the default TCTI is searched for using dlopen(3) semantics. The tools will
search for tabrmd, device and mssim TCTIs IN THAT ORDER and USE THE FIRST ONE FOUND. You can query what
TCTI will be chosen as the default by using the -v option to print the version information. The “de‐
fault-tcti” key-value pair will indicate which of the aforementioned TCTIs is the default.
Custom TCTIs
Any TCTI that implements the dynamic TCTI interface can be loaded. The tools internally use dlopen(3),
and the raw tcti-name value is used for the lookup. Thus, this could be a path to the shared library, or
a library name as understood by dlopen(3) semantics.
TCTI OPTIONS
This collection of options are used to configure the various known TCTI modules available:
• device: For the device TCTI, the TPM character device file for use by the device TCTI can be specified.
The default is /dev/tpm0.
Example: -T device:/dev/tpm0 or export TPM2TOOLS_TCTI=“device:/dev/tpm0”
• mssim: For the mssim TCTI, the domain name or IP address and port number used by the simulator can be
specified. The default are 127.0.0.1 and 2321.
Example: -T mssim:host=localhost,port=2321 or export TPM2TOOLS_TCTI=“mssim:host=localhost,port=2321”
• abrmd: For the abrmd TCTI, the configuration string format is a series of simple key value pairs sepa‐
rated by a `,' character. Each key and value string are separated by a `=' character.
• TCTI abrmd supports two keys:
1. `bus_name' : The name of the tabrmd service on the bus (a string).
2. `bus_type' : The type of the dbus instance (a string) limited to `session' and `system'.
Specify the tabrmd tcti name and a config string of bus_name=com.example.FooBar:
\--tcti=tabrmd:bus_name=com.example.FooBar
Specify the default (abrmd) tcti and a config string of bus_type=session:
\--tcti:bus_type=session
NOTE: abrmd and tabrmd are synonymous. the various known TCTI modules.
COMMAND CODE MAPPINGS
The friendly strings below can be used en lieu of the raw integer values.
-TPM2_CC_AC_GetCapability: 0x194 -TPM2_CC_AC_Send: 0x195 -TPM2_CC_ActivateCredential: 0x147 -TPM2_CC_Cer‐
tify: 0x148 -TPM2_CC_CertifyCreation: 0x14a -TPM2_CC_ChangeEPS: 0x124 -TPM2_CC_ChangePPS: 0x125
-TPM2_CC_Clear: 0x126 -TPM2_CC_ClearControl: 0x127 -TPM2_CC_ClockRateAdjust: 0x130 -TPM2_CC_ClockSet:
0x128 -TPM2_CC_Commit: 0x18b -TPM2_CC_ContextLoad: 0x161 -TPM2_CC_ContextSave: 0x162 -TPM2_CC_Create:
0x153 -TPM2_CC_CreateLoaded: 0x191 -TPM2_CC_CreatePrimary: 0x131 -TPM2_CC_DictionaryAttackLockReset:
0x139 -TPM2_CC_DictionaryAttackParameters: 0x13a -TPM2_CC_Duplicate: 0x14b -TPM2_CC_ECC_Parameters: 0x178
-TPM2_CC_ECDH_KeyGen: 0x163 -TPM2_CC_ECDH_ZGen: 0x154 -TPM2_CC_EC_Ephemeral: 0x18e -TPM2_CC_EncryptDe‐
crypt: 0x164 -TPM2_CC_EncryptDecrypt2: 0x193 -TPM2_CC_EventSequenceComplete: 0x185 -TPM2_CC_EvictControl:
0x120 -TPM2_CC_FieldUpgradeData: 0x141 -TPM2_CC_FieldUpgradeStart: 0x12f -TPM2_CC_FirmwareRead: 0x179
-TPM2_CC_FlushContext: 0x165 -TPM2_CC_GetCapability: 0x17a -TPM2_CC_GetCommandAuditDigest: 0x133
-TPM2_CC_GetRandom: 0x17b -TPM2_CC_GetSessionAuditDigest: 0x14d -TPM2_CC_GetTestResult: 0x17c
-TPM2_CC_GetTime: 0x14c -TPM2_CC_Hash: 0x17d -TPM2_CC_HashSequenceStart: 0x186 -TPM2_CC_Hierarchy‐
ChangeAuth: 0x129 -TPM2_CC_HierarchyControl: 0x121 -TPM2_CC_HMAC: 0x155 -TPM2_CC_HMAC_Start: 0x15b
-TPM2_CC_Import: 0x156 -TPM2_CC_IncrementalSelfTest: 0x142 -TPM2_CC_Load: 0x157 -TPM2_CC_LoadExternal:
0x167 -TPM2_CC_MakeCredential: 0x168 -TPM2_CC_NV_Certify: 0x184 -TPM2_CC_NV_ChangeAuth: 0x13b
-TPM2_CC_NV_DefineSpace: 0x12a -TPM2_CC_NV_Extend: 0x136 -TPM2_CC_NV_GlobalWriteLock: 0x132
-TPM2_CC_NV_Increment: 0x134 -TPM2_CC_NV_Read: 0x14e -TPM2_CC_NV_ReadLock: 0x14f -TPM2_CC_NV_ReadPublic:
0x169 -TPM2_CC_NV_SetBits: 0x135 -TPM2_CC_NV_UndefineSpace: 0x122 -TPM2_CC_NV_UndefineSpaceSpecial: 0x11f
-TPM2_CC_NV_Write: 0x137 -TPM2_CC_NV_WriteLock: 0x138 -TPM2_CC_ObjectChangeAuth: 0x150 -TPM2_CC_PCR_Allo‐
cate: 0x12b -TPM2_CC_PCR_Event: 0x13c -TPM2_CC_PCR_Extend: 0x182 -TPM2_CC_PCR_Read: 0x17e
-TPM2_CC_PCR_Reset: 0x13d -TPM2_CC_PCR_SetAuthPolicy: 0x12c -TPM2_CC_PCR_SetAuthValue: 0x183
-TPM2_CC_Policy_AC_SendSelect: 0x196 -TPM2_CC_PolicyAuthorize: 0x16a -TPM2_CC_PolicyAuthorizeNV: 0x192
-TPM2_CC_PolicyAuthValue: 0x16b -TPM2_CC_PolicyCommandCode: 0x16c -TPM2_CC_PolicyCounterTimer: 0x16d
-TPM2_CC_PolicyCpHash: 0x16e -TPM2_CC_PolicyDuplicationSelect: 0x188 -TPM2_CC_PolicyGetDigest: 0x189
-TPM2_CC_PolicyLocality: 0x16f -TPM2_CC_PolicyNameHash: 0x170 -TPM2_CC_PolicyNV: 0x149 -TPM2_CC_PolicyN‐
vWritten: 0x18f -TPM2_CC_PolicyOR: 0x171 -TPM2_CC_PolicyPassword: 0x18c -TPM2_CC_PolicyPCR: 0x17f
-TPM2_CC_PolicyPhysicalPresence: 0x187 -TPM2_CC_PolicyRestart: 0x180 -TPM2_CC_PolicySecret: 0x151
-TPM2_CC_PolicySigned: 0x160 -TPM2_CC_PolicyTemplate: 0x190 -TPM2_CC_PolicyTicket: 0x172 -TPM2_CC_PP_Com‐
mands: 0x12d -TPM2_CC_Quote: 0x158 -TPM2_CC_ReadClock: 0x181 -TPM2_CC_ReadPublic: 0x173 -TPM2_CC_Rewrap:
0x152 -TPM2_CC_RSA_Decrypt: 0x159 -TPM2_CC_RSA_Encrypt: 0x174 -TPM2_CC_SelfTest: 0x143 -TPM2_CC_Sequence‐
Complete: 0x13e -TPM2_CC_SequenceUpdate: 0x15c -TPM2_CC_SetAlgorithmSet: 0x13f -TPM2_CC_SetCommandCodeAu‐
ditStatus: 0x140 -TPM2_CC_SetPrimaryPolicy: 0x12e -TPM2_CC_Shutdown: 0x145 -TPM2_CC_Sign: 0x15d
-TPM2_CC_StartAuthSession: 0x176 -TPM2_CC_Startup: 0x144 -TPM2_CC_StirRandom: 0x146 -TPM2_CC_TestParms:
0x18a -TPM2_CC_Unseal: 0x15e -TPM2_CC_Vendor_TCG_Test: 0x20000000 -TPM2_CC_VerifySignature: 0x177
-TPM2_CC_ZGen_2Phase: 0x18d
EXAMPLES
Start a policy session and extend it with a specific command like unseal. Attempts to perform other op‐
erations would fail.
Create an unseal-only policy
tpm2_startauthsession -S session.dat
tpm2_policycommandcode -S session.dat -L policy.dat TPM2_CC_Unseal
tpm2_flushcontext session.dat
Create the object with unseal-only auth policy
tpm2_createprimary -C o -c prim.ctx
tpm2_create -C prim.ctx -u sealkey.pub -r sealkey.priv -L policy.dat \
-i- <<< "SEALED-SECRET"
Try unseal operation
tpm2_load -C prim.ctx -u sealkey.pub -r sealkey.priv -n sealkey.name \
-c sealkey.ctx
tpm2_startauthsession --policy-session -S session.dat
tpm2_policycommandcode -S session.dat -L policy.dat TPM2_CC_Unseal
tpm2_unseal -p session:session.dat -c sealkey.ctx
SEALED-SECRET
tpm2_flushcontext session.dat
Try any other operation
echo "Encrypt Me" > plain.txt
tpm2_encryptdecrypt plain.txt -o enc.txt -c sealkey.ctx plain.txt
ERROR: Esys_EncryptDecrypt2(0x12F) - tpm:error(2.0): authValue or authPolicy is
not available for selected entity
Returns
Tools can return any of the following codes:
• 0 - Success.
• 1 - General non-specific error.
• 2 - Options handling error.
• 3 - Authentication error.
• 4 - TCTI related error.
• 5 - Non supported scheme. Applicable to tpm2_testparams.
Limitations
It expects a session to be already established via tpm2_startauthsession(1) and requires one of the fol‐
lowing:
• direct device access
• extended session support with tpm2-abrmd.
Without it, most resource managers will not save session state between command invocations.
BUGS
Github Issues (https://github.com/tpm2-software/tpm2-tools/issues)
HELP
See the Mailing List (https://lists.linuxfoundation.org/mailman/listinfo/tpm2)
tpm2-tools tpm2_policycommandcode(1)