gnupg: Scdaemon Options
6.2 Option Summary
==================
'--options FILE'
Reads configuration from FILE instead of from the default per-user
configuration file. The default configuration 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 command line. It also overrides any
home directory stated through the environment variable 'GNUPGHOME'
or (on Windows systems) by means of the Registry entry
HKCU\SOFTWARE\GNU\GNUPG:HOMEDIR.
On Windows systems it is possible to install GnuPG as a portable
application. In this case only this command line option is
considered, all other ways to set a home directory are ignored.
To install GnuPG as a portable application under Windows, create an
empty file named 'gpgconf.ctl' in the same directory as the tool
'gpgconf.exe'. The root of the installation is then that
directory; or, if 'gpgconf.exe' has been installed directly below a
directory named 'bin', its parent directory. You also need to make
sure that the following directories exist and are writable:
'ROOT/home' for the GnuPG home and 'ROOT/var/cache/gnupg' for
internal cache files.
'-v'
'--verbose'
Outputs additional information while running. You can increase the
verbosity by giving several verbose commands to 'gpgsm', such as
'-vv'.
'--debug-level LEVEL'
Select the debug level for investigating problems. LEVEL may be a
numeric value or a keyword:
'none'
No debugging at all. A value of less than 1 may be used
instead of the keyword.
'basic'
Some basic debug messages. A value between 1 and 2 may be
used instead of the keyword.
'advanced'
More verbose debug messages. A value between 3 and 5 may be
used instead of the keyword.
'expert'
Even more detailed messages. A value between 6 and 8 may be
used instead of the keyword.
'guru'
All of the debug messages you can get. A value greater than 8
may be used instead of the keyword. The creation of hash
tracing files is only enabled if the keyword is used.
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.
Note: All debugging options are subject to change and thus
should not be used by any application program. As the name
says, they are only used as helpers to debug problems.
'--debug FLAGS'
This option is only useful for debugging and the behavior may
change at any time without notice. FLAGS are 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. See also option
'--debug-assuan-log-cats'.
'11 (2048)'
trace APDU I/O to the card. This may reveal sensitive data.
'12 (4096)'
trace some card reader related function calls.
'--debug-all'
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 when the process
aborts. For debugging purposes it is sometimes better to allow
core dump. This option enables it and also changes the working
directory to '/tmp' when running in '--server' mode.
'--debug-log-tid'
This option appends a thread ID to the PID in the log output.
'--debug-assuan-log-cats CATS'
Changes the active Libassuan logging categories to CATS. The value
for CATS is an unsigned integer given in usual C-Syntax. A value
of 0 switches to a default category. If this option is not used
the categories are taken from the environment variable
'ASSUAN_DEBUG'. Note that this option has only an effect if the
Assuan debug flag has also been with the option '--debug'. For a
list of categories see the Libassuan manual.
'--no-detach'
Don't detach the process from the console. This is mainly useful
for debugging.
'--listen-backlog N'
Set the size of the queue for pending connections. The default is
64. This option has an effect only if '--multi-server' is also
used.
'--log-file FILE'
Append all logging output to FILE. This is very helpful in seeing
what the agent actually does. Use 'socket://' to log to socket.
'--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').
'--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 falling 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 card terminal.
A value of 0 refers to the first serial device; add 32768 to access
USB devices. The default is 32768 (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. Powering down the card
avoids a potential risk of damaging a card when used with certain
cheap readers. This also allows applications that are not aware of
Scdaemon 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.
'--enable-pinpad-varlen'
Please specify this option when the card reader supports variable
length input for pinpad (default is no). For known readers (listed
in ccid-driver.c and apdu.c), this option is not needed. Note that
if your card reader doesn't supports variable length input but you
want to use it, you need to specify your pinpad request on your
card.
'--disable-pinpad'
Even if a card reader features a pinpad, do not try to use it.
'--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 option is useful to inhibit accidental
access to admin class command which could ultimately lock the card
through wrong PIN numbers. Note that GnuPG versions older than
2.0.11 featured an '--allow-admin' option 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 configuration file
after stripping off the two leading dashes.
Info Catalog
gnupg: Scdaemon Commands
gnupg: Invoking SCDAEMON
gnupg: Card applications