apgd

APGD(8)                           User Manual                          APGD(8)



NAME
       apgd - server that generates several random passwords


SYNOPSIS
       apgd [-a algorithm] [-M mode] [-E char_string] [-n num_of_pass] [-m
       min_pass_len] [-x max_pass_len] [-r dictfile] [-b filter_file] [-p
       min_substr_len] [-k] [-t] [-l]

DESCRIPTION
       apgd program is a server that supports Password Generation Protocol
       described in RFC972.  It uses several password generation algorithms
       (currently two) and a built-in pseudo random number generator.

       apgd is normally invoked by the Internet superserver (see inetd (8))
       for requests to connect to the pwdgen port (pwdgen port is 129
       according to RFC1700 ) as indicated by the /etc/services file (see
       services (5)).

       Default algorithm is pronounceable password generation algorithm
       designed by Morrie Gasser and described in "A Random Word Generator For
       Pronounceable Passwords" National Technical Information Service (NTIS)
       AD-A-017676.  The original paper is very old and had never been put
       online, so I have to use NIST implementation described in FIPS-181.

       Another algorithm is simple random character generation algorithm, but
       it uses four user-defined symbol sets to produce random password. It
       means that user can choose type of symbols that should appear in
       password. Symbol sets are: numeric symbol set (0,...,9) , capital
       letters symbol set (A,...,Z) , small letters symbol set (a,...,z) and
       special symbols symbol set (#,@,!,...).

       Built-in pseudo random number generator is an implementation of
       algorithm described in Appendix C of ANSI X9.17 or RFC1750 with
       exception that it uses CAST or SHA-1 instead of Triple DES.  It uses
       local time with precision of microseconds (see gettimeofday(2)) and
       /dev/random (if available) to produce initial random seed.

       apgd also have the ability to check generated password quality using
       dictionary. You can use this ability if you specify command-line option
       -r dictfile or -b filtername where dictfile is dictionary file name and
       filtername is the name of Bloom filter file. In that dictionary you may
       place words (one per line) that should not appear as generated
       passwords. For example: user names common words, etc. You even can use
       one of the dictionaries that come with dictionary password crackers.
       Bloom filter file should be created with apgbfm(1) utility included in
       apg distribution. In future releases I plan to implement some other
       techniques to check passwords just to make life easier.

       apgd has the ability log user password generation activity and internal
       debug information. It does this using
       facility = daemon
              priority = info for user password generation activity logging
              priority = debug for internal debug information
       See the syslogd(8) and syslog.conf(5) man pages for information on how
       to configure your syslog daemon.


OPTIONS
   Password generation modes options
       -a algorithm
              use algorithm for password generation.
              0 - (default) pronounceable password generation
              1 - random character password generation

       -n num_of_pass
              generate num_of_pass number of passwords. Default is 6.

       -m min_pass_len
              generate password with minimum length min_pass_len.  If
              min_pass_len > max_pass_len then max_pass_len = min_pass_len.
              Default minimum password length is 8.

       -x max_pass_len
              generate password with maximum length max_pass_len If
              min_pass_len > max_pass_len then max_pass_len = min_pass_len.
              Default maximum password length is 10.

       -M mode
              Use symbolsets specified with mode for password generation.
              mode is a text string consisting of characters S, s, N, n, C, c,
              L, l. Where:

              S      generator must use special symbol set for every generated
                     password.

              s      generator should use special symbol set for password
                     generation.

              N      generator must use numeral symbol set for every generated
                     password.

              n      generator should use numeral symbol set for password
                     generation.

              C      generator must use capital symbol set for every generated
                     password.

              c      generator should use capital symbol set for password
                     generation.

              L      generator must use small letters symbol set for every
                     generated password (always present if pronounceable
                     password generation algorithm is used).

              l      generator should use small letters symbol set for
                     password generation.

              R,r    not supported any more. Use -E char_string option
                     instead.
              mode can not be more than 4 characters in length.

              Note:
              Usage of L, M, N, C will slow down password generation process.

              Examples:
              -M sncl or -M SNCL or -M Cn

       -E char_string
              exclude characters in char_string from password generation
              process (in pronounceable password generation mode you can not
              exclude small letters). To include special symbols that can be
              recognized by shell (apostrophe, quotes, dollar sign, etc.) in
              char_string use the backslashed versions.

              Examples:

              Command apgd -a 1 -M n -n 3 -m 8 -e 23456789 will generate a set
              of passwords that will look like this
              10100110
              01111000
              11011101

              Command apgd -a 1 -M nc -n 3 -m 26 -e GHIJKLMNOPQRSTUVWXYZ will
              generate a set of passwords that will look like this
              16A1653CD4DE5E7BD9584A3476
              C8F78E06944AFD57FB9CB882BC
              8C8DF37CD792D36D056BBD5002

   Password quality control options
       -k     check every generated password using cracklib. To use this
              ability you must enable cracklib support during programm
              building.

       -r dictfile
              check generated passwords for their appearance in dictfile

       -b filter_file
              check generated passwords for their appearance in filter_file.
              filter_file should be created with apgbfm(1) utility.

       -p min_substr_len
              this option tells apg(1) to check every substring of the
              generated password for appearance in filter_file. If any of such
              substrings would be found in the filter_file then generated
              password would be rejected and apg(1) will generate another one.
              min_substr_len is specifies minimum substring length to check.
              This option is active only if -b option is defined.

   Password output options
       -l     spell genetated passwords. Useful when you want to read
              generated password by telephone.
              WARNING: Think twice before read your password by phone.

       -t     print pronunciation for generated pronounceable password

DEFAULT OPTIONS
       apgd -a 0 -M sncl -n 6 -x 10 -m 8 (new style)

EXIT CODE
       On successful completion of its task, apgd will complete with exit code
       0.  An exit code of -1 indicates an error occurred.  Textual errors are
       written to the syslogd (8).

DIAGNOSTICS
       All textual info is written to the syslogd(8).

FILES
       None.

BUGS
       None.  If you've found one, please send bug description to the author.

SEE ALSO
       apg(1), apgbfm(1)

AUTHOR
       Adel I. Mirzazhanov, <a-del@iname.com>
       Project home page: http://www.adel.nursat.kz/apg/



Automated Password Generator      2003 Aug 4                           APGD(8)