#
# This scripts changes a password on the local system or a remote host.
# Connections to the remote (this can also be localhost) are made by ssh, rsh,
# telnet or rlogin.
# @author Gaudenz Steinlin <gaudenz@soziologie.ch>
# For sudo support alter sudoers (using visudo) so that it contains the
# following information (replace 'apache' if your webserver runs under another
# user):
# -----
# # Needed for Horde's passwd module
# Runas_Alias REGULARUSERS = ALL, !root
# apache ALL=(REGULARUSERS) NOPASSWD:/usr/bin/passwd
# -----
# @stdin The username, oldpassword, newpassword (in this order)
# will be taken from stdin
# @param -prompt regexp for the shell prompt
# @param -password regexp password prompt
# @param -oldpassword regexp for the old password
# @param -newpassword regexp for the new password
# @param -verify regexp for verifying the password
# @param -success regexp for success changing the password
# @param -login regexp for the telnet prompt for the loginname
# @param -host hostname to be connected
# @param -timeout timeout for each step
# @param -log file for writing error messages
# @param -output file for loging the output
# @param -telnet use telnet
# @param -ssh use ssh (default)
# @param -rlogin use rlogin
# @param -slogin use slogin
# @param -sudo use sudo
# @param -program command for changing passwords
#
# @return 0 on success, 1 on failure
#
# default values
set host "localhost"
set login "ssh"
set program "passwd"
set prompt_string "(%|\\\$|>)"
set fingerprint_string "The authenticity of host.* can't be established.*\n(RSA|ECDSA) key fingerprint is.*\nAre you sure you want to continue connecting.*"
set password_string "(P|p)assword.*"
set oldpassword_string "((O|o)ld|login|\\\(current\\\) UNIX) (P|p)assword.*"
set newpassword_string "(N|n)ew.* (P|p)assword.*"
set badoldpassword_string "(Authentication token manipulation error).*"
set badpassword_string "((passwd|BAD PASSWORD).*|(passwd|Bad:).*\r)"
set verify_string "((R|r)e-*enter.*(P|p)assword|Retype new( UNIX)? password|(V|v)erification|(V|v)erify|(A|a)gain).*"
set success_string "((P|p)assword.* changed|successfully)"
set login_string "(((L|l)ogin|(U|u)sername).*)"
set timeout 20
set log "/tmp/passwd.out"
set output false
set output_file "/tmp/passwd.log"
# read input from stdin
fconfigure stdin -blocking 1
gets stdin user
gets stdin password(old)
gets stdin password(new)
# alternative: read input from command line
#if {$argc < 3} {
# send_user "Too few arguments: Usage $argv0 username oldpass newpass"
# exit 1
#}
#set user [lindex $argv 0]
#set password(old) [lindex $argv 1]
#set password(new) [lindex $argv 2]
# no output to the user
log_user 0
# read in other options
for {set i 0} {$i<$argc} {incr i} {
set arg [lindex $argv $i]
switch -- $arg "-prompt" {
incr i
set prompt_string [lindex $argv $i]
continue
} "-password" {
incr i
set password_string [lindex $argv $i]
continue
} "-oldpassword" {
incr i
set oldpassword_string [lindex $argv $i]
continue
} "-newpassword" {
incr i
set newpassword_string [lindex $argv $i]
continue
} "-verify" {
incr i
set verify_string [lindex $argv $i]
continue
} "-success" {
incr i
set success_string [lindex $argv $i]
continue
} "-login" {
incr i
set login_string [lindex $argv $i]
continue
} "-host" {
incr i
set host [lindex $argv $i]
continue
} "-timeout" {
incr i
set timeout [lindex $argv $i]
continue
} "-log" {
incr i
set log [lindex $argv $i]
continue
} "-output" {
incr i
set output_file [lindex $argv $i]
set output true
continue
} "-telnet" {
set login "telnet"
continue
} "-ssh" {
set login "ssh"
continue
} "-ssh-exec" {
set login "ssh-exec"
continue
} "-rlogin" {
set login "rlogin"
continue
} "-slogin" {
set login "slogin"
continue
} "-sudo" {
set login "sudo"
continue
} "-program" {
incr i
set program [lindex $argv $i]
continue
}
}
# log session
if {$output} {
log_file $output_file
}
set err [open $log "w" "0600"]
# start remote session
if {[string match $login "rlogin"]} {
set pid [spawn rlogin $host -l $user]
} elseif {[string match $login "slogin"]} {
set pid [spawn slogin $host -l $user]
} elseif {[string match $login "ssh"]} {
set pid [spawn ssh $host -l $user]
} elseif {[string match $login "ssh-exec"]} {
set pid [spawn ssh $host -l $user $program]
} elseif {[string match $login "sudo"]} {
set pid [spawn sudo -u $user $program]
} elseif {[string match $login "telnet"]} {
set pid [spawn telnet $host]
expect -re $login_string {
sleep .5
send "$user\r"
}
} else {
puts $err "Invalid login mode. Valid modes: rlogin, slogin, ssh, telnet, sudo\n"
close $err
exit 1
}
set old_password_notentered true
if {![string match $login "sudo"]} {
# log in
expect {
-re $fingerprint_string {sleep .5
send yes\r
exp_continue}
-re $password_string {sleep .5
send $password(old)\r}
timeout {puts $err "Could not login to system (no password prompt)\n"
close $err
exit 1}
}
# start password changing program
expect {
-re $prompt_string {sleep .5
send $program\r}
# The following is for when passwd is the login shell or ssh-exec is used
-re $oldpassword_string {sleep .5
send $password(old)\r
set old_password_notentered false}
timeout {puts $err "Could not login to system (bad old password?)\n"
close $err
exit 1}
}
}
# send old password
if {$old_password_notentered} {
expect {
-re $oldpassword_string {sleep .5
send $password(old)\r}
timeout {puts $err "Could not start passwd program (no old password prompt)\n"
close $err
exit 1}
}
}
# send new password
expect {
-re $newpassword_string {sleep .5
send $password(new)\r}
-re $badoldpassword_string {puts $err "Old password is incorrect\n"
close $err
exit 1}
timeout {puts "Could not change password (bad old password?)\n"
close $err
exit 1}
}
# send new password again
expect {
-re $badpassword_string {puts $err "$expect_out(0,string)"
close $err
send \003
sleep .5
exit 1}
-re $verify_string {sleep .5
send $password(new)\r}
timeout {puts $err "New password not valid (too short, bad password, too similar, ...)\n"
close $err
send \003
sleep .5
exit 1}
}
# check response
expect {
-re $success_string {sleep .5
send exit\r}
-re $badpassword_string {puts $err "$expect_out(0,string)"
close $err
exit 1}
timeout {puts $err "Could not change password.\n"
close $err
exit 1}
}
# exit succsessfully
expect {
eof {close $err
exit 0}
}
close $err
