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>