This file is indexed.

/usr/bin/expect_mkpasswd is in expect-dev 5.45-5ubuntu1.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
#!/bin/sh
# -*- tcl -*-
# The next line is executed by /bin/sh, but not tcl \
exec tclsh8.6 "$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} {
    expr {int($m*rand())}
}

# 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"
			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"