DragonFly On-Line Manual Pages
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, S, 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 generated 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)