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|
#!/bin/bash
#
# firma v0.2: simple encrypted mailing list aliases
# feedback: rhatto@riseup.net | GPL
#
# list configuration is passed through a config file,
# where you put PARAMETER=value (whithout spaces)
#
# MAIL= path for mail program
# GPG= path for gnupg binary
# TMP= where you want the temp files
# LISTNAME= list email
# GPGDIR= gpg dir for the lists' keyring
# PASSWD= passwd for the lists' keyring
# FOOTER= message footer
# ALLOWSENDKEY = set to 1 if you want people automatically receive the list
# key requesting through listname-request@example.tld
# with subject: key
#
# design / todo:
#
# - list-request:
# - key (allow send key)
# - help
# - subscribe: exchange pubkey
# - unsubscribe
# - strings
# - check signatures
# - create list
# - archive (optional)
# - logfile (optional)
# - gpg --no-tty --display-charset --utf8-strings ?
#
# sintax: firma -c || firma config-file
# -c: create a new list
# config-file: parse the email from stdin
# with the parameters specified in the
# config-file
#
# fix:
#
# - special chars
# - id's recipient selection
#
fuction _refresh_cache {
rm $1 $1.gpg
touch $1; chmod 600 $1;
touch $1.gpg; chmod 600 $TMP.gpg;
}
function _process_message {
# get the headers
FROM=$(grep -m 1 ^From: $1 | cut -f 2 -d :)
DATE=$(grep -m 1 ^Date: $1)
SUBJECT=$(grep -m 1 ^Subject: $1)
# detect the encrypted message
sed -n '/-----BEGIN PGP MESSAGE-----/,/-----END PGP MESSAGE-----/p' $1 >> $1.gpg
# encrypting and sending for each recipient on the list
for EMAIL in $($GPGLIST | grep pub | cut -d "<" -f 2 | sed -e 's/>//' | grep @ | grep -v $LISTNAME); do
echo "$PASSWD
Message from: $FROM
$SUBJECT
$DATE
$(echo "$PASSWD" | $GPGDECRYPT $1.gpg)
---
$FOOTER
" | sed -e 's/=20$//' | $GPGENCRYPT $EMAIL | $MAIL -r $LISTNAME $EMAIL
done
}
function _process_request {
# todo: support subjects like "key ", etc
FROM=$(grep -m 1 ^From: $1 | cut -f 2 -d :)
REQUEST=$(grep -m 1 ^Subject: $1)
if [[ $REQUEST == "key" ]]; then
if [[ $ALLOWSENDKEY == 1 ]]; then
# send key to From: recipient
else
# dont send the key; return error message
fi
else if [[ $REQUEST == "subscribe" ]]; then
# check if user put its pubkey and
# ask the list for subscribe From: recipient
else if [[ $REQUEST == "unsubscribe" ]]; then
# unsubscribe and advise the list
else
# error message
fi
}
function _process {
# eval the config file
source $1
GPGCOMMAND="$GPG -q --homedir $GPGDIR"
GPGLIST="$GPGCOMMAND --list-keys"
GPGDECRYPT="$GPGCOMMAND --decrypt"
GPGENCRYPT="$GPGCOMMAND --always-trust --hidden-recipient --textmode -e -s -a -r"
# clear the cache before read the message
_refresh_cache $TMP
# todo: use an array
while read STDIN; do
echo $STDIN >> $TMP
done
# check with action is requested depending on the To: field
TO=$(grep -m 1 ^To: $)
if [[ $TO == $LISTNAME ]]; then _process_message $TMP;
else _process_request $TMP;
fi
# clear after process
_refresh_cache $TMP
}
function newlist {
LISTHOME =
LISTNANE =
...
$GPGCOMMAND --gen-key
}
# check sintax
if [[ $1 = "-c" ]]; then
_newlist;
else if [ -f $1 ];
then _process $1;
else
echo sintax: $0 [-c] [config-file];
fi
rm $TMP $TMP.gpg
|
