Provided by: tpm2-tools_5.4-1_amd64 bug

NAME

       tpm2_policycountertimer(1)  -  Enables  policy  authorization by evaluating the comparison
       operation on the TPM parameters time, clock, reset count, restart count and TPM clock safe
       flag.

SYNOPSIS

       tpm2_policycountertimer [OPTIONS] [ARGUMENT]

DESCRIPTION

       tpm2_policycountertimer(1)  -  Enables  policy  authorization by evaluating the comparison
       operation on the TPM parameters time, clock, reset count, restart count and TPM clock safe
       flag.   If  time/clock, it is input as milliseconds value.  The parameter and the value is
       given as a command line argument as below:

              tpm2_policycountertimer -S session.ctx safe
              tpm2_policycountertimer -S session.ctx clock=<N ms>
              tpm2_policycountertimer -S session.ctx time=<N ms>
              tpm2_policycountertimer -S session.ctx resets=<N>
              tpm2_policycountertimer -S session.ctx restarts=<N>

       By default comparison tests for equality and also by default it tests for time.

OPTIONS

-L, --policy=FILE:

         File to save the policy digest.

       • -S, --session=FILE:

         The policy session file generated via the -S option to  tpm2_startauthsession  or  saved
         off of a previous tool run.

       • –eq

         if value of current time in the TPM = value of specified input time.

       • –neq

       if value of current time in the TPM != value of specified input time.

       • –sgt

       if signed value of current time in the TPM > signed value of specified input time.

       • –ugt

       if unsigned value of current time in the TPM > unsigned value of specified input time.

       • –slt

       if signed value of current time in the TPM < signed value of specified input time.

       • –ult

       if unsigned value of current time in the TPM < unsigned value of specified input time.

       • –sge

       if signed value of current time in the TPM >= signed value of specified input time.

       • –uge

       if unsigned value of current time in the TPM >= unsigned value of specified input time.

       • –sle

       if signed value of current time in the TPM <= unsigned value of specified input time.

       • –ule

       if unsigned value of current time in the TPM <= unsigned value of specified input time.

       • –bs

         if  all bits set in value of current time in the TPM are set in value of specified input
         time.

       • –bc

         if all bits set in value of current time in the TPM are  clear  in  value  of  specified
         input time.

       • --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 expect.

       • -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.  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 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 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.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.

EXAMPLES

       Create a sealing object with an authorization policy that evaluates only for first  minute
       of TPM restart.

   Create the policy and the sealing object
              tpm2_startauthsession -S session.ctx

              tpm2_policycountertimer -S session.ctx -L policy.countertimer --ult 60000

              tpm2_flushcontext session.ctx

              tpm2_createprimary -C o -c prim.ctx -Q

              echo "SUPERSECRET" | \
              tpm2_create -Q -u key.pub -r key.priv -i- -C prim.ctx \
              -L policy.countertimer -a "fixedtpm|fixedparent" -c key.ctx

   Unsealing should work in the first minute after TPM restart
              tpm2_startauthsession -S session.ctx --policy-session

              tpm2_policycountertimer -S session.ctx --ult 60000

              tpm2_unseal -c key.ctx -p session:session.ctx

              tpm2_flushcontext session.ctx

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 following:

       • 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)