GNU Privacy Guard SCDAEMON(1)
NAME
scdaemon - Smartcard daemon for the GnuPG system
SYNOPSIS
scdaemon [--homedir dir] [--options file] [options] --server
scdaemon [--homedir dir] [--options file] [options] --daemon
[command_line]
DESCRIPTION
The scdaemon is a daemon to manage smartcards. It is usu-
ally invoked by gpg-agent and in general not used directly.
COMMANDS Commands are not distinguished from options except for the fact that only one command is allowed.--version
Print the program version and licensing information. Not that you can abbreviate this command.--help, -h
Print a usage message summarizing the most usefulcommand-line options. Not that you can abbreviate this
command.--dump-options
Print a list of all available options and commands. Not that you can abbreviate this command.--server
Run in server mode and wait for commands on the stdin. This is default mode is to create a socket and listen for commands there.--multi-server
Run in server mode and wait for commands on the stdin as well as on an additional Unix Domain socket. The server command GETINFO may be used to get the name of that extra socket.--daemon
GnuPG 2.0.13 Last change: 2010-10-12 1
GNU Privacy Guard SCDAEMON(1) Run the program in the background. This option is required to prevent it from being accidentally running in the background. OPTIONS--options file
Reads configuration from file instead of from thedefault per-user configuration file. The default con-
figuration file is named scdaemon.conf and expected in
the .gnupg directory directly below the home directory of the user.--homedir dir
Set the name of the home directory to dir. If this option is not used, the home directory defaults to~/.gnupg. It is only recognized when given on the com-
mand line. It also overrides any home directory stated through the environment variable GNUPGHOME or (on W32 systems) by means of the Registry entry HKCU\Software\GNU\GnuPG:HomeDir.-v
--verbose
Outputs additional information while running. You canincrease the verbosity by giving several verbose com-
mands to gpgsm, such as -vv.
--debug-level level
Select the debug level for investigating problems. level may be one of: none no debugging at all. basic some basic debug messages advanced more verbose debug messages expert even more detailed messagesGnuPG 2.0.13 Last change: 2010-10-12 2
GNU Privacy Guard SCDAEMON(1) guru all of the debug messages you can get How these messages are mapped to the actual debugging flags is not specified and may change with newer releases of this program. They are however carefully selected to best aid in debugging. All debugging options are subject to change and thus should not be used by any application program. As thename says, they are only used as helpers to debug prob-
lems.--debug flags
This option is only useful for debugging and the behaviour may change at any time without notice. FLAGSare bit encoded and may be given in usual C-Syntax. The
currently defined bits are: 0 (1)command I/O 1 (2) values of big number integers 2 (4) low level crypto operations 5 (32) memory allocation 6 (64) caching 7 (128) show memory statistics. 9 (512)
write hashed data to files named dbgmd-000*
10 (1024) trace Assuan protocol 11 (2048)trace APDU I/O to the card. This may reveal sen-
sitive data.--debug-all
GnuPG 2.0.13 Last change: 2010-10-12 3
GNU Privacy Guard SCDAEMON(1)Same as --debug=0xffffffff
--debug-wait n
When running in server mode, wait n seconds before entering the actual processing loop and print the pid. This gives time to attach a debugger.--debug-ccid-driver
Enable debug output from the included CCID driver for smartcards. Using this option twice will also enable some tracing of the T=1 protocol. Note that this option may reveal sensitive data.--debug-disable-ticker
This option disables all ticker functions like checking for card insertions.--debug-allow-core-dump
For security reasons we won't create a core dump whenthe process aborts. For debugging purposes it is some-
times better to allow core dump. This options enables it and also changes the working directory to /tmp whenrunning in --server mode.
--debug-log-tid
This option appends a thread ID to the PID in the log output.--no-detach
Don't detach the process from the console. This is mainly useful for debugging.--log-file file
Append all logging output to file. This is very help-
ful in seeing what the agent actually does.--pcsc-driver library
Use library to access the smartcard reader. The current default is libpcsclite.so. Instead of using this option you might also want to install a symbolic link to the default file name (e.g. from libpcsclite.so.1).GnuPG 2.0.13 Last change: 2010-10-12 4
GNU Privacy Guard SCDAEMON(1)--ctapi-driver library
Use library to access the smartcard reader. The current default is libtowitoko.so. Note that the use of this interface is deprecated; it may be removed in future releases.--disable-ccid
Disable the integrated support for CCID compliant readers. This allows to fall back to one of the other drivers even if the internal CCID driver can handle the reader. Note, that CCID support is only available if libusb was available at build time.--reader-port number_or_string
This option may be used to specify the port of the cardterminal. A value of 0 refers to the first serial dev-
ice; add 32768 to access USB devices. The default is32768 (first USB device). PC/SC or CCID readers might need a string here; run the program in verbose mode to get a list of available readers. The default is then the first reader found. To get a list of available CCID readers you may use this command:
echo scd getinfo reader_list | gpg-connect-agent --decode | awk '/^D/ {print $2}'
--card-timeout n
If n is not 0 and no client is actively using the card,the card will be powered down after n seconds. Power-
ing down the card avoids a potential risk of damaging a card when used with certain cheap readers. This also allows non Scdaemon aware applications to access the card. The disadvantage of using a card timeout is that accessing the card takes longer and that the user needs to enter the PIN again after the next power up. Note that with the current version of Scdaemon the card is powered down immediately at the next timer tick for any value of n other than 0.--disable-keypad
Even if a card reader features a keypad, do not try to use it.GnuPG 2.0.13 Last change: 2010-10-12 5
GNU Privacy Guard SCDAEMON(1)--deny-admin
This option disables the use of admin class commands for card applications where this is supported.Currently we support it for the OpenPGP card. This com-
mands is useful to inhibit accidental access to admin class command which could ultimately lock the card through wrong PIN numbers. Note that GnuPG versionsolder than 2.0.11 featured an --allow-admin command
which was required to use such admin commands. This option has no more effect today because the default is now to allow admin commands.--disable-application name
This option disables the use of the card application named name. This is mainly useful for debugging or if a application with lower priority should be used by default.All the long options may also be given in the confi-
guration file after stripping off the two leading dashes. CARD APPLICATIONSscdaemon supports the card applications as described below.
The OpenPGP card application ``openpgp'' This application is currently only used by gpg but may in future also be useful with gpgsm. Version 1 and version 2 of the card is supported. The specifications for these cards are available at(http://g10code.com/docs/openpgp-card-1.0.pdf) and
(http://g10code.com/docs/openpgp-card-2.0.pdf).
The Telesec NetKey card ``nks''This is the main application of the Telesec cards as avail-
able in Germany. It is a superset of the German DINSIG card. The card is used by gpgsm.GnuPG 2.0.13 Last change: 2010-10-12 6
GNU Privacy Guard SCDAEMON(1) The DINSIG card application ``dinsig'' This is an application as described in the German draftstandard DIN V 66291-1. It is intended to be used by cards
supporting the German signature law and its bylaws (SigG and SigV).The PKCS#15 card application ``p15''
This is common framework for smart card applications. It is used by gpgsm. The Geldkarte card application ``geldkarte'' This is a simple application to display information of a German Geldkarte. The Geldkarte is a small amount debit card application which comes with almost all German banking cards.EXAMPLES
$ scdaemon --server -v
FILES There are a few configuration files to control certainaspects of scdaemons's operation. Unless noted, they are
expected in the current home directory (see: [option --
homedir]).scdaemon.conf
This is the standard configuration file read by scdae-
mon on startup. It may contain any valid long option; the leading two dashes may not be entered and the option may not be abbreviated. This default name maybe changed on the command line (see: [option --
options]).GnuPG 2.0.13 Last change: 2010-10-12 7
GNU Privacy Guard SCDAEMON(1)scd-event
If this file is present and executable, it will becalled on veyer card reader's status changed. An exam-
ple of this script is provided with the distributionreader_n.status
This file is created by sdaemon to let other applica-
tions now about reader status changes. Its use is nowdeprecated in favor of scd-event.
SEE ALSO
gpg-agent(1), gpgsm(1), gpg2(1)
The full documentation for this tool is maintained as a Tex-
info manual. If GnuPG and the info program are properly installed at your site, the command info gnupg should give you access to the complete manual including a menu structure and an index.ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:_______________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE|
|____________________|__________________|_
| Availability | crypto/gnupg ||____________________|__________________|_
| Interface Stability| Uncommitted ||____________________|_________________|
NOTES Source for GnuPG is available at http://opensolaris.org and at http://www.gnupg.org. Documentation is available at file:///usr/share/man, and http://www.gnupg.org.GnuPG 2.0.13 Last change: 2010-10-12 8