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stoken(1)		    General Commands Manual		     stoken(1)

NAME
       stoken -	software token for cryptographic authentication

SYNOPSIS
       stoken [tokencode] [--stdin] [--force] [--next] [opts]

       stoken import {--file=file | --token=token_string} [--force] [opts]

       stoken setpin [opts]

       stoken setpass [opts]

       stoken show [--seed] [opts]

       stoken  export  [{--blocks  |  --iphone	| --android | --v3 | --sdtid |
       --qr=file.png | --show-qr}] [opts]

       stoken issue [--template=file]

       stoken help

       stoken version

DESCRIPTION
       stoken is a software token compatible with RSA  SecurID	128-bit	 (AES)
       tokens.	 The  command-line interface provides facilities for importing
       new tokens, displaying the current tokencode, encrypting	the seed  with
       a  user-specified password, storing the user's PIN alongside the	token,
       and viewing or exporting	the token data.

BASIC USAGE
       Use  stoken  import  to	decode	a  token  string  and  write  it  into
       ~/.stokenrc.   This  may	 prompt	 for  a	 device	 ID  and/or  password,
       depending on what options your administrator used to create the	token.
       The  token  string  can be provided on the command line,	or read	from a
       text file.

       stoken will autodetect the following types of token strings:

       286510182209303756117707012447003320623006...
       29658-21098-45467-64675-65731-01441-11337...
	      Pure numeric (81-digit) "ctf" (compressed	token format) strings,
	      with or without dashes.  These may have been furnished as-is, or
	      they could have been derived from	 an  sdtid  file  by  the  RSA
	      TokenConverter program.

       com.rsa.securid.iphone://ctf?ctfData=229639330774927764401...
	      iPhone-compatible	token strings.

       http://127.0.0.1/securid/ctf?ctfData=250494932146245277466...
       http://127.0.0.1/securid/ctf?ctfData=AwAAfBc3QSopPxxjLGnxf...
	      Android-compatible token strings.

       <?xml version=...
	      RSA  sdtid-formatted XML files.  These should be imported	from a
	      file: stoken import --file=FILE.SDTID.

       Tokens supplied as QR codes can be converted back to standard  URIs  by
       running zbarimg(1) on the image file.

       The  device  ID,	if used, can be	viewed in the "about" menu for the RSA
       soft token app on the phone.  Numeric ctf strings and smartphone	tokens
       bound  to a device ID contain a seed that is encrypted using the	device
       ID, so the ID must be furnished before stoken can  successfully	import
       the token.  sdtid files can be imported without knowledge of the	device
       ID, as long as the password (if any) is known.

       By default, stoken import will refuse to	overwrite an existing token in
       ~/.stokenrc.  The --force switch	overrides this check.

       stoken import will normally prompt for a	new password, which is used to
       encrypt the seed	 before	 storing  it  in  ~/.stokenrc.	 This  can  be
       bypassed	by entering an empty password, or specifying --new-password=''
       on the command line.  It	is recommended to choose  a  longer,  hard-to-
       guess passphrase	for this purpose.

       After  a	token has been imported, running stoken	with no	arguments will
       prompt for any required password	 or  PIN,  then	 display  the  current
       tokencode.

       Tokencodes are computed from the	raw (decrypted)	seed data, the current
       time of day, and	the PIN.  If the same seed is  installed  on  multiple
       devices,	they should all	produce	identical tokencodes.  If they do not,
       double-check the	timezone setting and consider using NTP	to synchronize
       the system time to a known good source.

       stoken  setpin  can  be	used  to save the PIN in ~/.stokenrc.  Not all
       tokens will require a PIN;  this	 can  be  configured  by  the  SecurID
       administrator  when  generating	new tokens.  Setting an	empty PIN will
       remove the PIN from ~/.stokenrc so that the user	will be	prompted every
       time it is required.  See the SECURITY CONSIDERATIONS section below for
       additional details.

       stoken setpass encrypts the seed	and PIN	(if  present)  in  ~/.stokenrc
       with a user-selectable password or passphrase.  If an empty password is
       entered,	the password will be removed.  See the SECURITY	CONSIDERATIONS
       section below for additional details.

VIEWING	TOKENS
       stoken  show  displays  information  about the current token, typically
       read from ~/.stokenrc.  The --seed option displays  the	encrypted  and
       decrypted  seed	bytes  (which  should be treated as sensitive data, as
       they can	be used	to derive tokencodes).

       stoken export translates	the current token into a format	 suitable  for
       importation to another device.

       stoken  issue  generates	 a  new	software token in XML sdtid format.  A
       template	file, itself in	sdtid format, may be provided to override some
       or  all	of  the	 human-readable	fields.	 This would permit appropriate
       serial numbers, expiration dates, usernames, etc. to be specified.   If
       Secret, Seed, or	MAC fields are present in the template file, they will
       be ignored.

GLOBAL OPTIONS
       --rcfile=file
	      Use  an  alternate  .stokenrc  configuration  file.    This   is
	      typically	 used  to  support  multiple tokens on the same	user's
	      UNIX account.  Note that the .stokenrc  file  stores  additional
	      data  (such as the PIN), so it cannot be parsed as a "raw" token
	      string by	stoken --file.

       --password=password, -p password
	      Use a password  supplied	from  the  command  line,  instead  of
	      prompting	the user.  See notes in	SECURITY CONSIDERATIONS	below.

       --pin=pin, -n pin
	      Use  a  PIN supplied from	the command line, instead of prompting
	      the user.	 See notes in SECURITY CONSIDERATIONS below.   If  you
	      save  your  PIN  in  ~/.stokenrc,	 note that --pin=0000 is often
	      required when activating a new soft token	for the	first time.

       --devid=devid
	      Use a device ID supplied from the	command	line  to  decrypt  the
	      token.   A  token	can be bound to	a class	GUID device ID (i.e. a
	      certain type of device, such as "iPhone" or "Android"), a	unique
	      device  ID (one specific unit), or nothing.  stoken will attempt
	      to autodetect matches with a class GUID, but on  rare  occasions
	      this  results  in	 false	positives  due to hash collisions.  In
	      these cases, the bound device ID	should	be  specified  on  the
	      command line to override autodetection.

EXPORT OPTIONS
       --new-password=password
	      Supply  the  encryption  password	 from  the  command  line  for
	      operations that write out	a  token  string  or  .stokenrc	 file:
	      import,  export,	setpass,  and  issue.	See  notes in SECURITY
	      CONSIDERATIONS below.

       --keep-password
	      If the token in the .stokenrc file is protected with a password,
	      retain  the same password	when exporting the token.  By default,
	      the export operation will	not encrypt the	token with a password;
	      note that	it may not be possible to enter	all possible passwords
	      on devices with limited text input capabilities (such as feature
	      phones).

       --new-pin=pin
	      Supply a new PIN from the	command	line for the setpin operation.
	      See notes	in SECURITY CONSIDERATIONS below.

       --new-devid=devid
	      Used with	the export or issue command to encrypt the  new	 token
	      with  a  specific	 device	 ID.   This  is	 only used for testing
	      purposes.

       --blocks, --iphone, --android, --v3
	      Used with	the export command to select the output	 format.   See
	      examples	in  BASIC  USAGE.  By default, the export command will
	      print an unformatted 81-digit string to standard output.

       --sdtid,	--xml
	      These options are	synonyms.  Both	export	a  token  to  standard
	      output in	RSA's sdtid XML	format.

       --qr=file.png
	      Encode  the  token  as a QR code and write it to file.png.  This
	      requires the qrencode program to be installed.

       --show-qr
	      Encode the token as a QR code and	immediately display it on  the
	      screen.  This requires the qrencode program to be	installed.  If
	      the QR_VIEWER environment	variable is set, stoken	will use  that
	      program  as  the	preferred  viewer.   Otherwise	it will	try to
	      execute a	few common Linux image viewers,	and give up if none of
	      them exist.

       --template=file
	      Used with	the export or issue commands to	override fields	in the
	      XML output.  The template	file should  look  like	 any  standard
	      sdtid  file,  but	 all  fields  are optional and will default to
	      reasonably sane values if	omitted.  This can be  used  to	 force
	      the  output  XML	to  use	 a  specific serial number, user name,
	      expiration  date,	 etc.	 Correct   MAC	 checksums   will   be
	      (re)computed on the provided values.  See	the examples directory
	      in the source distribution for more information.

OTHER OPTIONS
       --use-time={unix_time|+offset|-offset}
	      Instead of generating a tokencode	based on the current  time  of
	      day,  force a specific time, or adjust the current time based on
	      a	positive or negative offset (specified in seconds).   This  is
	      only used	for testing purposes.

       --next Generate	the  next  tokencode instead of	the current tokencode.
	      For a 60-second token, this is equivalent	to --use-time=+60.

       --stdin,	-s
	      When generating a	tokencode that requires	either a  password  or
	      PIN,  read  the  password	 or  PIN  as single line from standard
	      input.  This is intended to  allow  external  programs  to  call
	      stoken   to   generate   single-use   passwords	without	  user
	      intervention; see	NON-INTERACTIVE	USE below.

       --force,	-f
	      Override token expiration	date checks (for tokencode)  or	 token
	      overwrite	checks (for import).

       --batch,	-b
	      Abort  with  an  error  exit code	if any user input is required.
	      Intended for automated operation and testing.

       --file=file
	      Read a ctf string, an Android/iPhone URI,	or an XML sdtid	 token
	      from  file  instead of the .stokenrc configuration.  Most	stoken
	      commands accept this flag, but it	is expected that  the  typical
	      user  will save his token	in ~/.stokenrc instead of supplying it
	      by hand on every invocation.  Typically --file and  --token  are
	      only used	for the	import command.

       --token=token_string
	      Use a token from the command line	instead	of the .stokenrc file.
	      See above	notes on --file.

       --random
	      Generate a random	 token	on  the	 fly.	Used  for  testing  or
	      demonstrations  only.   These tokens should not be used for real
	      authentication.

       --help, -h
	      Display basic usage information.

       --version, -v
	      Display version information.

SECURITY CONSIDERATIONS
       Software	 tokens,  unlike  hardware  tokens,  are  relatively  easy  to
       replicate.   Systems  that  store  soft token seeds should be carefully
       guarded to prevent unauthorized	disclosure.   The  use	of  whole-disk
       encryption,  such as TrueCrypt, is strongly recommended for laptops and
       other portable devices that are easily lost or stolen.

       stoken permits users to store their PIN in  ~/.stokenrc	to  allow  for
       automated  (scriptable) generation of tokencodes, but the risks of this
       approach	should be carefully weighed against the	benefits.

       Using the setpass command to encrypt the	seed and  PIN  in  ~/.stokenrc
       provides	 some  degree  of  protection against unauthorized access, but
       does not	necessarily cover all possible attack vectors.	A host that is
       already	compromised  (e.g.  running  a	keylogger)  will  not  provide
       adequate	protection for any seed(s) stored on it.

       stoken encryption passwords may be up to	40 characters long.  A	longer
       passphrase  constructed	from  several  random  words  can provide more
       protection from brute-force attacks than	a shorter password.

       Entering	a password or PIN on the command line is generally  unsafe  on
       multiuser  systems, as other users may be able to view the command line
       arguments in ps or similar utilities.  The command line could  also  be
       cached in shell history files.

       Encoding	 QR  tokens  may  expose  the  seed  data  through ps, and the
       --show-qr option	writes temporary PNG files in /tmp.

       stoken attempts to lock pages to	prevent	swapping out to	disk, but does
       not scrub secrets from process memory.

NON-INTERACTIVE	USE
       Other applications, such	as VPN clients,	may want to invoke stoken non-
       interactively to	generate single-use passwords.	Three usage modes  are
       supported, depending on the level of security (and/or convenience) that
       is required:

   No password or PIN
       The user	configures  stoken  to	print  a  tokencode  immediately  upon
       invocation,  with  no  prompts,	by  using  setpin  to store the	PIN in
       ~/.stokenrc and using setpass to	set  an	 empty	password.   The	 other
       application  can	 then  invoke  stoken  --batch	and read the tokencode
       through a pipe from standard output.

       This  provides  no  security  for  the  seed,  but  may	be  useful  in
       applications   where  (re-)authentication  is  frequent	or  unattended
       operation is required.

   Save	the PIN	and set	a password
       The user	configures stoken to encrypt the ~/.stokenrc  secrets  with  a
       password	 using	setpass,  then saves the PIN with setpin.  The PIN and
       the  seed  will	both  be  encrypted  with  the	password.   The	 other
       application  will  request the password from the	user, then call	stoken
       --stdin,	write the password to stoken's standard	input through a	 pipe,
       and read	back a tokencode from stoken's standard	output.

   No password;	prompt for the PIN
       Similar	to above, but set an empty password using setpass, do not save
       the PIN in ~/.stokenrc, and pass	the PIN	to stoken --stdin via standard
       input.

BUGS/TODO
       sdtid  support  is  still  new and may choke on unexpected input.  As a
       short-term workaround you can try commenting out	the sanity  checks  in
       sdtid_decrypt() to see if the problem goes away.

       Features	 under	development  include:  hardware	 token	seeds (and the
       stoken split command  needed  to	 work  with  them),  and  support  for
       non-Linux hosts.

       Patches are always welcome.

SEE ALSO
       stoken-gui(1).

FILES
       ~/.stokenrc
	      Default configuration file.

AUTHOR
       Kevin Cernekee <cernekee@gmail.com>

				  2012-09-09			     stoken(1)

NAME | SYNOPSIS | DESCRIPTION | BASIC USAGE | VIEWING TOKENS | GLOBAL OPTIONS | EXPORT OPTIONS | OTHER OPTIONS | SECURITY CONSIDERATIONS | NON-INTERACTIVE USE | BUGS/TODO | SEE ALSO | FILES | AUTHOR

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