Posts tagged expect

openvpn and GNU expect

posted on 2016-04-31 20:56

Since I often need openvpn connections and I like to start them from within terminals to see what actually happens, but dislike having to enter AD credentials everytime, here is a solution with expect to this.

Security-wise that's questionable, but I don't need a lection on that.

Replace <CONFIGFILE>, <USERNAME>, <PASSWORD>, of course.

#!/usr/bin/expect -f



## SETUP

# handle ctrl-c
proc sigint_handler {} {
  # send ctrl-c to openvpn process
  send \x03
  # wait for it to die
  sleep 1
  # quit expect session
  exit
}

# catch ctrl-c
trap sigint_handler SIGINT



## RUN

# start shell...
set timeout -1
spawn $env(SHELL)
match_max 100000

# ... and openvpn within there
send -- "sudo openvpn --config <CONFIGNAME>\r"

# username prompt
expect -exact "^[\[0;1;39mEnter Auth Username: ^[\[0m"
send -- "<USERNAME>\r"

# password prompt
expect -exact "^[\[0;1;39mEnter Auth Password: ^[\[0m"
send -- "<PASSWORD>\r"

# make expect wait so it doesn not exit immediately
expect eof

Replace the ^['s above (four times in the code above) with literal escapes. You can insert these in vim by pressing ctrl-v + Esc in linux.

I always set up openvpn to also push DNS settings (resolvconf package and stuff), so there is some CTRL-c-handling necessary so it works and everything closes cleanly.

The escape codes for the expect lines I could discern by using autoexpect.

expect: update linux passwords through passwd from a list

posted on 2015-11-04 14:42:48

I know this is hacky, but I was in dire need:

IFS=$'\n'; for i in `cat pw`; do NAME=`echo $i | awk '{print $1}'`; PASS=`echo $i | awk '{print $2}'`; if getent passwd $NAME &>/dev/null; then expect -D0 -c "spawn passwd $NAME; expect \"Enter new UNIX password: \"; send \"$PASS\\r\"; expect \"Retype new UNIX password: \"; send \"$PASS\\r\";exit"; sleep 1; fi; done

Credentials were contained in a single .txt file, username and passwords, nothing else existed in there, both were separated by whitespaces. The file was called pw and laid in the same folder where the line above was run.

A watch -n1 -d /etc/shadow is helpful to see what happens. Still check your passwords afterwards!

UPDATE:

Try chpasswd. I feel stupid for not googling enough, at least a little.

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