Need specialized random string generator script Post: 302485619

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Top Forums Shell Programming and Scripting Need specialized random string generator script Post 302485619 by BeefStu on Wednesday 5th of January 2011 05:50:44 PM

01-05-2011

Registered User

If you don't know much about code, I'm not sure how helpful this forum will
be to you.

Having said that, you can play around with this and adjust MINIMUM_LEN
and MAXIMUM_LEN to suit your needs.

Code:

cat random_password.ksh
#!/bin/ksh
mkrandpwd()
{
let MINIMUM_LEN=5
let MAXIMUM_LEN=20
#### 
#### Set the array of valid characters to be all upper and
#### lower case letters, all digits, and a selected set of
#### punctuation symbols.
#### 
　
set -A CHARS a b c d e f g h i j k l m n o p q r s t u v w x y z \
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z \
0 1 2 3 4 5 6 7 8 9 \; \: \. \~ \! \@ \# \$ \% \^ \& \* - + = \? 
　
CNUM="${#CHARS[@]}"

################################################################

#### Calculate a random length for the random password string between the
#### MINIMUM_LEN and MAXIMUM_LEN values provided
#### 
MAXLEN=$(( $MINIMUM_LEN + ( $RANDOM % ( $MAXIMUM_LEN - $MINIMUM_LEN ) ) ))

#### 
#### extract a random character from the CHARS array for each position
#### of the random password string. The length of the random string 
#### determined by the MAXLEN variable.
#### 
RANDSTR=""
let POSCNT=0; 
while [ 1 -eq 1 ] 
do
if [ $POSCNT -ge $MAXLEN ]
then
break;
fi
let POSCNT=$POSCNT+1
#### 
#### Using the modulo of a random number divided by the number of 
#### characters (array elements) in the CHARS array, provides a
#### random array element position. The random array element position
#### is used to append a single character at a time from the CHARS array
#### onto the random password string variable RANDSTR.
#### 
RANDSTR="${RANDSTR}${CHARS[${RANDOM}%${CNUM}]}"
done
　
echo "password=${RANDSTR} length=${MAXLEN}"
return 0
}
mkrandpwd

Here is some some sample output:

Code:

password=KBIJAuEBax0JciX           length=15
password=e+JUKKO9TJPCQ%.G     length=16
password=ZSJ5V7Qrl                    length=9
password=-;Kk+C2hE3z+hoLKH-    length=18

Last edited by radoulov; 01-05-2011 at 07:18 PM.. Reason: Code tags, please!

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LEARN ABOUT SUNOS

kpasswd

kpasswd(1)							   User Commands							kpasswd(1)

NAME

       kpasswd - change a user's Kerberos password

SYNOPSIS

       /usr/bin/kpasswd [principal]

DESCRIPTION

       The  kpasswd command is used to change a Kerberos principal's password. kpasswd prompts for the current Kerberos password, which is used to
       obtain a changepw ticket from the KDC for the user's Kerberos realm. If kpasswd successfully obtains  the  changepw  ticket,  the  user	is
       prompted twice for the new password, and the password is changed.

       If the principal is governed by a policy that specifies the length and/or number of character classes required in the new password, the new
       password must conform to the policy. (The five character classes are lower case, upper case, numbers, punctuation, and  all  other  charac-
       ters.)

OPERANDS

       The following operand is supported:

       principal

	   Change  the	password  for the Kerberos principal principal. Otherwise, the principal is derived from the identity of the user invoking
	   the kpasswd command.

FILES

       /tmp/ovsec_adm.xxxxxx

	   Temporary credentials cache for the lifetime of the password changing operation. (xxxxxx is a random string.)

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWkrbu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       SEAM(5)

BUGS

       If kpasswd is suspended, the changepw tickets may not be destroyed.

SunOS 5.10							    30 Jul 2001 							kpasswd(1)