#!/bin/sh
# -*- tcl -*-
# The next line is executed by /bin/sh, but not tcl \
exec tclsh "$0" ${1+"$@"}
package require Expect
# mkpasswd - make a password, if username given, set it.
# Author: Don Libes, NIST
# defaults
set length 9
set minnum 2
set minlower 2
set minupper 2
set minspecial 1
set verbose 0
set distribute 0
if {[file executable /bin/nispasswd]} {
set defaultprog /bin/nispasswd
} elseif {[file executable /bin/yppasswd]} {
set defaultprog /bin/yppasswd
} elseif {[file executable /bin/passwd]} {
set defaultprog /bin/passwd
} else {
set defaultprog passwd
}
set prog $defaultprog
while {[llength $argv]>0} {
set flag [lindex $argv 0]
switch -- $flag \
"-l" {
set length [lindex $argv 1]
set argv [lrange $argv 2 end]
} "-d" {
set minnum [lindex $argv 1]
set argv [lrange $argv 2 end]
} "-c" {
set minlower [lindex $argv 1]
set argv [lrange $argv 2 end]
} "-C" {
set minupper [lindex $argv 1]
set argv [lrange $argv 2 end]
} "-s" {
set minspecial [lindex $argv 1]
set argv [lrange $argv 2 end]
} "-v" {
set verbose 1
set argv [lrange $argv 1 end]
} "-p" {
set prog [lindex $argv 1]
set argv [lrange $argv 2 end]
} "-2" {
set distribute 1
set argv [lrange $argv 1 end]
} default {
set user [lindex $argv 0]
set argv [lrange $argv 1 end]
break
}
}
if {[llength $argv]} {
puts "usage: mkpasswd \[args] \[user]"
puts " where arguments are:"
puts " -l # (length of password, default = $length)"
puts " -d # (min # of digits, default = $minnum)"
puts " -c # (min # of lowercase chars, default = $minlower)"
puts " -C # (min # of uppercase chars, default = $minupper)"
puts " -s # (min # of special chars, default = $minspecial)"
puts " -v (verbose, show passwd interaction)"
puts " -p prog (program to set password, default = $defaultprog)"
exit 1
}
if {$minnum + $minlower + $minupper + $minspecial > $length} {
puts "impossible to generate $length-character password\
with $minnum numbers, $minlower lowercase letters,\
$minupper uppercase letters and\
$minspecial special characters."
exit 1
}
# if there is any underspecification, use additional lowercase letters
set minlower [expr {$length - ($minnum + $minupper + $minspecial)}]
set lpass "" ;# password chars typed by left hand
set rpass "" ;# password chars typed by right hand
# insert char into password at a random position, thereby spreading
# the different kinds of characters throughout the password
proc insert {pvar char} {
upvar $pvar p
set p [linsert $p [rand [expr {(1+[llength $p])}]] $char]
}
proc rand {m} {
set device /dev/urandom ;# /dev/random can block
set fileId [open $device r]
binary scan [read $fileId 4] i1 number
set clipped [expr $number % $m]
# puts "number is $number"
# puts "clipped is $clipped"
close $fileId
return $clipped
}
# choose left or right starting hand
set initially_left [set isleft [rand 2]]
# given a size, distribute between left and right hands
# taking into account where we left off
proc psplit {max lvar rvar} {
upvar $lvar left $rvar right
global isleft
if {$isleft} {
set right [expr $max/2]
set left [expr $max-$right]
set isleft [expr !($max%2)]
} else {
set left [expr $max/2]
set right [expr $max-$left]
set isleft [expr $max%2]
}
}
if {$distribute} {
set lkeys {q w e r t a s d f g z x c v b}
set rkeys {y u i o p h j k l n m}
set lnums {1 2 3 4 5 6}
set rnums {7 8 9 0}
set lspec {! @ # \$ %}
set rspec {^ & * ( ) - = _ + [ ] "{" "}" \\ | ; : ' \" < > , . ? /}
} else {
set lkeys {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}
set rkeys {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}
set lnums {0 1 2 3 4 5 6 7 8 9}
set rnums {0 1 2 3 4 5 6 7 8 9}
set lspec {! @ # \$ % ~ ^ & * ( ) - = _ + [ ] "{" "}" \\ | ; : ' \" < > , . ? /}
set rspec {! @ # \$ % ~ ^ & * ( ) - = _ + [ ] "{" "}" \\ | ; : ' \" < > , . ? /}
}
set lkeys_length [llength $lkeys]
set rkeys_length [llength $rkeys]
set lnums_length [llength $lnums]
set rnums_length [llength $rnums]
set lspec_length [llength $lspec]
set rspec_length [llength $rspec]
psplit $minnum left right
for {set i 0} {$i<$left} {incr i} {
insert lpass [lindex $lnums [rand $lnums_length]]
}
for {set i 0} {$i<$right} {incr i} {
insert rpass [lindex $rnums [rand $rnums_length]]
}
psplit $minlower left right
for {set i 0} {$i<$left} {incr i} {
insert lpass [lindex $lkeys [rand $lkeys_length]]
}
for {set i 0} {$i<$right} {incr i} {
insert rpass [lindex $rkeys [rand $rkeys_length]]
}
psplit $minupper left right
for {set i 0} {$i<$left} {incr i} {
insert lpass [string toupper [lindex $lkeys [rand $lkeys_length]]]
}
for {set i 0} {$i<$right} {incr i} {
insert rpass [string toupper [lindex $rkeys [rand $rkeys_length]]]
}
psplit $minspecial left right
for {set i 0} {$i<$left} {incr i} {
insert lpass [lindex $lspec [rand $lspec_length]]
}
for {set i 0} {$i<$right} {incr i} {
insert rpass [lindex $rspec [rand $rspec_length]]
}
# merge results together
foreach l $lpass r $rpass {
if {$initially_left} {
append password $l $r
} else {
append password $r $l
}
}
if {[info exists user]} {
if {!$verbose} {
log_user 0
}
spawn $prog $user
expect {
"assword*:" {
# some systems say "Password (again):"
send -- "$password\r"
# "--" because of passwords beginning with dash
exp_continue
}
}
# if user isn't watching, check status
if {!$verbose} {
if {[lindex [wait] 3]} {
puts -nonewline "$expect_out(buffer)"
exit 1
}
}
if {$verbose} {
puts -nonewline "password for $user is "
}
}
puts "$password"
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