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add the awful autopw password injector
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.\" This manual page was written by Jan Schaumann <jschauma@yahoo-inc.com> | ||
.Dd February 05, 2011 | ||
.Dt AUTOPW 1 | ||
.Os | ||
.Sh NAME | ||
.Nm autopw | ||
.Nd cache and re-inject passwords into other programs | ||
.Sh SYNOPSIS | ||
.Nm | ||
.Ar command | ||
.Sh DESRIPTION | ||
The | ||
.Nm | ||
utility will cache passwords and re-inject them whenever the given command | ||
requires them. | ||
That is, if | ||
.Ar command | ||
prompts for a password, | ||
.Nm | ||
will cache it and then provide that password the next time | ||
.Ar command | ||
asks for it. | ||
.Pp | ||
.Nm | ||
is frequently used to wrap commands invoking | ||
.Xr ssh 1 | ||
repeatedly to avoid having the user monitor the command and re-supply | ||
their password when other forms of automation are not possible. | ||
.Sh PROMPTS MATCHED | ||
.Nm | ||
currently matches and distinguishes the following prompts: | ||
.Bl -bullet -compact -offset indent | ||
.It | ||
assword: | ||
.It | ||
Enter passphrase for | ||
.It | ||
Bad passphrase, try again | ||
.It | ||
Enter PEM pass phrase: | ||
.It | ||
Enter passphrase: | ||
.It | ||
y,n,(y/n)? | ||
.It | ||
?,??,q | ||
.It | ||
(yes/no)? | ||
.El | ||
.Pp | ||
In the latter examples, | ||
.Nm | ||
will be affirmative instead of supplying a password. | ||
.Sh EXAMPLES | ||
The following examples illustrate common usage of this tool. | ||
.Pp | ||
To invoke the command 'foo.sh' and have | ||
.Nm | ||
cache and re-inject any passwords prompted for, run | ||
.Bd -literal -offset indent | ||
autopw sh foo.sh | ||
.Ed | ||
.Sh CAVEATS | ||
Since | ||
.Nm | ||
must keep the password available in memory it is obviously advised against | ||
using this tool on shared hosts. | ||
.Pp | ||
You should only invoke commands that you actually trust -- | ||
.Nm | ||
will only respond to specific patterns, and any program that prompts one | ||
of the strings | ||
.Nm | ||
is looking for will be supplied with the given password. | ||
This is particularly concerning when executing commands on a remote, | ||
possibly untrusted host. | ||
.Pp | ||
.Nm | ||
does not play very well with multiple levels of pseudo-terminals (screen | ||
sessions, 'ssh -t' etc.) and may at times print the cleartext password to | ||
the terminal. | ||
.Pp | ||
.Nm | ||
invokes | ||
.Xr perl 1 Ns 's | ||
\'pack/unpack' function for each password provided/injected. | ||
This can become a performance-impacting limitation. | ||
.Sh SEE ALSO | ||
.Xr expect 1 , | ||
.Xr perl 1 | ||
.Sh HISTORY | ||
The | ||
.Nm | ||
utility was originally written at Yahoo! Inc. | ||
It not being terribly original or clever, there appeared a number of | ||
variations. | ||
This variant is bundled with the | ||
.Xr scanmaster 1 | ||
scripts for convenience. |
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#!/usr/local/bin/expect -- | ||
# | ||
# A generic password injector. | ||
# | ||
# Copyright (c) 2011 Yahoo! Inc. | ||
# All rights reserved. | ||
# | ||
# Redistribution and use of this software in source and binary forms, | ||
# with or without modification, are permitted provided that the following | ||
# conditions are met: | ||
# | ||
# * Redistributions of source code must retain the above | ||
# copyright notice, this list of conditions and the | ||
# following disclaimer. | ||
# | ||
# * Redistributions in binary form must reproduce the above | ||
# copyright notice, this list of conditions and the | ||
# following disclaimer in the documentation and/or other | ||
# materials provided with the distribution. | ||
# | ||
# * Neither the name of Yahoo! Inc. nor the names of its | ||
# contributors may be used to endorse or promote products | ||
# derived from this software without specific prior | ||
# written permission of Yahoo! Inc. | ||
# | ||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | ||
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED | ||
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A | ||
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | ||
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | ||
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | ||
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | ||
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | ||
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | ||
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
|
||
proc respond { pw } { | ||
global pws | ||
if {![info exists pws($pw)]} { | ||
send_user " (autopw) " | ||
stty -echo | ||
expect_user -re "(.+)\n" | ||
stty echo | ||
set pws($pw) \ | ||
[exec perl -ne "print pack(q{u}, \$_)" << $expect_out(1,string)] | ||
} else { | ||
send_user " (autopw'ed)" | ||
} | ||
log_user 0 | ||
send -- "[exec perl -ne "print unpack(q{u}, \$_)" << $pws($pw)]\n"; | ||
log_user 1 | ||
} | ||
|
||
## main () | ||
|
||
set timeout -1 | ||
global pws | ||
|
||
eval spawn -noecho $argv | ||
|
||
expect { | ||
"assword:" { | ||
respond system | ||
exp_continue | ||
} | ||
"Enter passphrase for " { | ||
respond ssh | ||
exp_continue | ||
} | ||
"Bad passphrase, try again" { | ||
unset pws(ssh) | ||
respond ssh | ||
exp_continue | ||
} | ||
"Enter PEM pass phrase:" { | ||
respond pem | ||
exp_continue | ||
} | ||
"Enter passphrase: " { | ||
respond gpg | ||
exp_continue | ||
} | ||
"y,n,?" { | ||
send -- "y\n" | ||
exp_continue | ||
} | ||
"(y/n)?" { | ||
send -- "y\n" | ||
exp_continue | ||
} | ||
"?,??,q" { | ||
send -- "\n" | ||
exp_continue | ||
} | ||
"(yes/no)?" { | ||
send -- "yes\n" | ||
exp_continue | ||
} | ||
eof { | ||
exit | ||
} | ||
} |