focal (8) tcsd.8.gz

NAME

       tcsd - daemon that manages Trusted Computing resources

SYNOPSIS

       tcsd [-f] [-e] [-c <configfile> ] [-h]

DESCRIPTION

       Trousers is an open-source TCG Software Stack (TSS), released under the BSD License. Trousers aims to be
       compliant with the current (1.1b) and upcoming (1.2) TSS specifications available from the Trusted
       Computing Group website: http://www.trustedcomputinggroup.org.

       tcsd is a user space daemon that should be (according to the TSS spec) the only portal to the TPM device
       driver. At boot time, tcsd should be started, it should open the TPM device driver and from that point
       on, all requests to the TPM should go through the TSS stack. The tcsd manages TPM resources and handles
       requests from TSP's both local and remote.

       -f, --foreground
              run the daemon in the foreground

       -e     attempt to connect to software TPMs over TCP

       -c, --config <configfile>
              use the provided configuration file rather than the default configuration file

       -h, --help
              display help message

ACCESS CONTROL

       There are two types of access control for the tcsd, access to the daemon's socket itself and access to
       specific commands internal to the tcsd. Access to the tcsd's port should be controlled by the system
       administrator using firewall rules.  If using iptables, the following rule will allow a specific host
       access to the tcsd:

       # iptables -A INPUT -s $IP_ADDRESS -p tcp --destination-port 30003 -j ACCEPT

       Access to individual commands internal to the tcsd is configured by the tcsd configuration file's
       "remote_ops" directive. Each function call in the TCS API is reachable by a unique ordinal.  Each labeled
       "remote op" actually defines a set of ordinals (usually more than one) necessary to accomplish the
       operation. So, for example, the "random" operation enables the ordinals for opening and closing a
       context, calling TCS_StirRandom and TCS_GetRandom, as well as TCS_FreeMemory. By default, connections
       from localhost will allow any ordinals.

DATA FILES

       TSS applications have access to 2 different kinds of 'persistent' storage. 'User' persistent storage has
       the lifetime of that of the application using it and therefore is destroyed when an application exits.
       User PS is controlled by the TSP of the application.  'System' persistent storage is controlled by the
       TCS and stays valid across application lifetimes, tcsd restarts and system resets. Data registered in
       system PS stays valid until an application requests that it be removed. User PS files are by default
       stored as /var/tpm/user.{pid} and the system PS file by default is /var/tpm/system.data.  The system PS
       file is initially created when ownership of the TPM is first taken.

CONFIGURATION

       tcsd configuration is stored by default in /etc/tcsd.conf

DEBUG OUTPUT

       If TrouSerS has been compiled with debugging enabled, the debugging output can be supressed by setting
       the TSS_DEBUG_OFF environment variable.

DEVICE DRIVERS

       tcsd is compatible with the IBM Research TPM device driver available from
       http://ibmswtpm.sourceforge.net/ and the TPM device driver available from http://sf.net/projects/tpmdd,
       which is also available in the upstream Linux kernel and many Linux distros.

CONFORMING TO

       tcsd conforms to the Trusted Computing Group Software Specification version 1.1 Golden

SEE ALSO

       tcsd.conf(5)

AUTHOR

       Kent Yoder

REPORTING BUGS

       Report bugs to <trousers-tech@lists.sf.net>