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tcsd

tcsd

Section: Maintenance Commands (8) Updated: 2005-03-15
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TCG Software Stack
 

NAME

tcsd - daemon that manages Trusted Computing resources  

SYNOPSIS

tcsd [-f]

 

DESCRIPTION

Trousers is an open-source TCG Software Stack (TSS), released under the Common Public 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
run the daemon in the foreground

 

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://www.research.ibm.com/gsal/tcpa and the TPM device driver available from http://sf.net/projects/tmpdd

 

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>


 

Index

NAME
SYNOPSIS
DESCRIPTION
ACCESS CONTROL
DATA FILES
CONFIGURATION
DEBUG OUTPUT
DEVICE DRIVERS
CONFORMING TO
SEE ALSO
AUTHOR
REPORTING BUGS

This document was created by man2html, using the manual pages.
Time: 22:02:29 GMT, April 16, 2011