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tpm2_evictcontrol(1) General Commands Manual tpm2_evictcontrol(1) NAME tpm2_evictcontrol(1) - Make a transient object persistent or evict a per- sistent object. SYNOPSIS tpm2_evictcontrol [OPTIONS] [ARGUMENT] DESCRIPTION tpm2_evictcontrol(1) - Allows a transient object to be made persistent or a persistent object to be evicted. The HANDLE argument controls the index the handle will be assigned to. If the object specified via -c is tran- sient, and a permanent HANDLE is specified, the object will be persisted at HANDLE. If HANDLE is a -, then the object will be persisted at the first available permanent handle location. If the object specified via -c is a permanent handle, then the object will be evicted from it's permenent han- dle location. OPTIONS * -C, --hierarchy=OBJECT: The authorization hierarchy used to authorize the commands. Defaults to the "owner" hierarchy. Supported options are: * o for TPM_RH_OWNER * p for TPM_RH_PLATFORM * <num> where a raw number can be used. * -c, --object-context=OBJECT: A context object specifier of a transient or persistent object. If OB- JECT is a transient object it will be persisted, either to the handle specified by the argument or to first available vacant persistent handle. If the OBJECT is for a persistent object, then the object will be evicted from non-volatile memory. * -P, --auth=AUTH: The authorization value for the hierarchy specified with -C. * -o, --output=FILE: Optionally output a serialized object representing the persistent handle. If untampered, these files are safer to use then raw persistent handles. A raw persistent handle should be verified that the object it points to is as expected. * --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. * ARGUMENT the command line argument specifies the persistent handle to save the transient object to. Output The tool outputs a YAML compliant dictionary with the fields: persistent- handle: action: evicted|persisted Where persistent-handle is the handle the action occurred to. Where action can either be one of evicted or persisted. If an object is evicted then the object is no longer resident at the persistent-handle address within the TPM. If an object is persisted then the object is resident at the per- sistent-handle address within the TPM. References Context Object Format The type of a context object, whether it is a handle or file name, is de- termined according to the following logic in-order: * If the argument is a file path, then the file is loaded as a restored TPM transient object. * If the argument is a prefix match on one of: * owner: the owner hierarchy * platform: the platform hierarchy * endorsement: the endorsement hierarchy * lockout: the lockout control persistent object * If the argument argument can be loaded as a number it will be treat as a handle, e.g. 0x81010013 and used directly._OBJECT_. Authorization Formatting Authorization for use of an object in TPM2.0 can come in 3 different forms: 1. Password 2. HMAC 3. Sessions NOTE: "Authorizations default to the EMPTY PASSWORD when not specified". Passwords Passwords are interpreted in the following forms below using prefix identi- fiers. Note: By default passwords are assumed to be in the string form when they do not have a prefix. String A string password, specified by prefix "str:" or it's absence (raw string without prefix) is not interpreted, and is directly used for authorization. Examples foobar str:foobar Hex-string A hex-string password, specified by prefix "hex:" is converted from a hex- idecimal form into a byte array form, thus allowing passwords with non- printable and/or terminal un-friendly characters. Example hex:1122334455667788 File A file based password, specified be prefix "file:" should be the path of a file containing the password to be read by the tool or a "-" to use stdin. Storing passwords in files prevents information leakage, passwords passed as options can be read from the process list or common shell history fea- tures. Examples # to use stdin and be prompted file:- # to use a file from a path file:path/to/password/file # to echo a password via stdin: echo foobar | tpm2_tool -p file:- # to use a bash here-string via stdin: tpm2_tool -p file:- <<< foobar Sessions When using a policy session to authorize the use of an object, prefix the option argument with the session keyword. Then indicate a path to a ses- sion file that was created with tpm2_startauthsession(1). Optionally, if the session requires an auth value to be sent with the session handle (eg policy password), then append a + and a string as described in the Pass- words section. Examples To use a session context file called session.ctx. session:session.ctx To use a session context file called session.ctx AND send the authvalue my- password. session:session.ctx+mypassword To use a session context file called session.ctx AND send the HEX authvalue 0x11223344. session:session.ctx+hex:11223344 PCR Authorizations You can satisfy a PCR policy using the "pcr:" prefix and the PCR minilan- guage. The PCR minilanguage is as follows: <pcr-spec>=<raw-pcr-file> The PCR spec is documented in in the section "PCR bank specifiers". The raw-pcr-file is an optional argument that contains the output of the raw PCR contents as returned by tpm2_pcrread(1). PCR bank specifiers Examples To satisfy a PCR policy of sha256 on banks 0, 1, 2 and 3 use a specifier of: pcr:sha256:0,1,2,3 specifying AUTH. COMMON OPTIONS This collection of options are common to many programs and provide informa- tion that many users may expect. * -h, --help=[man|no-man]: Display the tools manpage. By default, it at- tempts to invoke the manpager for the tool, however, on failure will out- put 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 speci- fied, or the manpager fails, the short options will be output to stdout. To successfully use the manpages feature requires the manpages to be in- stalled 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 con- sole during its execution. When using this option the file and line num- ber 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. Defin- ing the environment TPM2TOOLS_ENABLE_ERRATA is equivalent. 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 support not using a TCTI. Tools that do not support it will error when attempted to be used without a TCTI connec- tion. 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-con- fig> results in the default being 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 "default-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 separated 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.exam- ple.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. EXAMPLES To make a transient handle persistent at address 0x81010002 tpm2_changeauth -c o ownerauth tpm2_createprimary -c primary.ctx -P ownerauth tpm2_evictcontrol -C o -c primary.ctx 0x81010002 -P ownerauth To evict a persistent handle tpm2_evictcontrol -C o -c 0x81010002 -P ownerauth To make a transient handle persistent and output a serialized persistent han- dle. tpm2_evictcontrol -C o -c primary.ctx -o primary.handle -P ownerauth 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. BUGS Github Issues (https://github.com/tpm2-software/tpm2-tools/issues) HELP See the Mailing List (https://lists.linuxfoundation.org/mail- man/listinfo/tpm2) tpm2-tools tpm2_evictcontrol(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | Output | Context Object Format | Authorization Formatting | COMMON OPTIONS | TCTI Configuration | TCTI OPTIONS | EXAMPLES | Returns | BUGS | HELP
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