diff options
Diffstat (limited to 'misc/poc/firma-0.2.2')
-rwxr-xr-x | misc/poc/firma-0.2.2 | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/misc/poc/firma-0.2.2 b/misc/poc/firma-0.2.2 new file mode 100755 index 0000000..f1a8f27 --- /dev/null +++ b/misc/poc/firma-0.2.2 @@ -0,0 +1,153 @@ +#!/bin/bash +# +# firma v0.2.2: simple encrypted mailing list aliases +# feedback: rhatto@riseup.net luis@riseup.net | GPL +# +# list configuration is passed thru the 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 +# LISTADMIN= list administrator email addresses (space separated) +# GPGDIR= gpg dir for the lists' keyring +# PASSWD= passwd for the lists' keyring + +# if the configuration file exists, disable "sourcepath" and evaluate the parameters +if [ -f $1 ]; then + shopt -u sourcepath && source $1 +else + echo -e "\nConfiguration file \"$1\" could not be found.\n" + exit +fi + +# declare GPG variables +GPGCOMMAND="$GPG --quiet --homedir $GPGDIR --batch --no-tty --no-use-agent --no-permission-warning" +GPGLIST="$GPGCOMMAND --list-keys --with-colons" +GPGDECRYPT="$GPGCOMMAND --passphrase-fd 0 --decrypt" +GPGENCRYPT="$GPGCOMMAND --passphrase-fd 0 --always-trust --encrypt --sign --armor --recipient" + +# check configuration file parameters +# todo: check if $TMP directory/files exist +if [ ! -f $GPG -o ! -x $GPG ]; then + echo -e "\n$1: GPG binary ($GPG) could not be found.\n" + exit +elif [ ! -f $MAIL -o ! -x $MAIL ]; then + echo -e "\n$1: Mail program ($MAIL) could not be found.\n" + exit +elif [ ! -d $GPGDIR -o ! -f $GPGDIR/pubring.gpg -o ! -f $GPGDIR/secring.gpg ]; then + echo -e "\n$1: GPG home directory ($GPGDIR) or the GPG keyrings could not be found.\n" + exit +elif [ -z "$(cat $1 | grep -o ^PASSWD=\'[^\']*\'$)" -o \ + -z "$(echo -n $PASSWD)" -o \ + "$(echo -n $PASSWD | wc -m)" -lt "25" -o \ + -z "$(echo -n $PASSWD | grep -o [[:lower:][:upper:]])" -o \ + -z "$(echo -n $PASSWD | grep -o [[:digit:]])" -o \ + "$(echo -n $PASSWD | grep -o [[:punct:]] | wc -l)" -lt "5" ]; then + echo -e "\n$1: PASSWD is empty or does not meet the minimum complexity requirements." + echo "$1: Please set a new passphrase for the list's private key. Make it at least" + echo "$1: 25 characters long (using a combination of letters, numbers and at least" + echo "$1: 5 special characters) and enclose it in 'single quotes'. The passphrase" + echo -e "$1: itself, though, cannot contain any single quote.\n" + exit +elif [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$LISTNAME\>$)" ]; then + echo -e "\n$1: GPG key for list \"$LISTNAME\" could not be found." + echo -e "$1: Note that this parameter expects an email address.\n" + exit +else + for ADMIN in $LISTADMIN; do { + if [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$ADMIN\>$)" ]; then + echo -e "\n$1: GPG key for list administrator \"$ADMIN\" could not be found." + echo -e "$1: Note that this parameter expects one or more space separated email addresses.\n" + exit + fi; } + done +fi + +# declare functions +# discard $GPGDECRYPT STDOUT and get its STDERR instead, for signature checking +function GPGSTDERR { + echo $PASSWD | ($GPGDECRYPT --status-fd 2 $TMP.gpg 1> /dev/null) 2>&1 ; +} + +# get list susbscriber addresses +function SUBSCRIBERS { + $GPGLIST | sed -ne "/$LISTNAME/Id" -e '/pub/p' | cut -d : -f 10 | grep -o '<[^<>]*>$' | sed -e 's/[<>]//g' ; +} + +# create the temporary files and restrict their permissions +rm -f $TMP $TMP.gpg +touch $TMP && chmod 600 $TMP +touch $TMP.gpg && chmod 600 $TMP.gpg + +# todo: use an array +while read STDIN; do + echo $STDIN >> $TMP +done + +# get the message headers and the sender's email address +FROM=$(grep -m 1 ^From: $TMP | cut -d : -f 2- | sed -e 's/^ //') +FROMADD=$(if [ -z "$(echo $FROM | grep '>$')" ] ; then echo $FROM ; else echo $FROM | grep -o '<[^<>]*>$' | sed -e 's/[<>]//g' ; fi) +DATE=$(grep -m 1 ^Date: $TMP) +SUBJECT=$(grep -m 1 ^Subject: $TMP | cut -d : -f 2- | sed -e 's/^ //') + +# get the encrypted message +sed -ne '/-----BEGIN PGP MESSAGE-----/,/-----END PGP MESSAGE-----/p' $TMP >> $TMP.gpg + +# if signature is Good, encrypt and send it for each list subscriber +# todo: declare a function to decrypt, re-encrypt and send the list messages +if (GPGSTDERR | grep -Fq GOODSIG) ; then + + for EMAIL in $(SUBSCRIBERS); do + + echo "$PASSWD + Message from: $FROM + Subject: $SUBJECT + $DATE + + $(GPGSTDERR | grep -F 'gpg: Signature made') + $(GPGSTDERR | grep -F 'gpg: Good signature from') + +$(echo $PASSWD | $GPGDECRYPT $TMP.gpg 2> /dev/null)" | sed -e 's/=20$//' | $GPGENCRYPT $EMAIL | $MAIL -r $LISTNAME $EMAIL + + done + +# else, if signature is BAD, email it back to the list admins and to sender +elif (GPGSTDERR | grep -Fq BADSIG) ; then + + for EMAIL in $(echo $LISTADMIN $FROMADD); do + + echo "$PASSWD + Message from: $FROM + Subject: [BAD SIGNATURE] $SUBJECT + $DATE + + $(GPGSTDERR | grep -F 'gpg: Signature made') + $(GPGSTDERR | grep -F 'gpg: BAD signature from') + +$(echo $PASSWD | $GPGDECRYPT $TMP.gpg 2> /dev/null)" | sed -e 's/=20$//' | $GPGENCRYPT $EMAIL | $MAIL -r $LISTNAME $EMAIL + + done + +# else, probably either the message was not signed or the sender is not subscribed to the list +# email the message back to sender including a note about this +# todo: parse STDERR to find out why the signature couldn't be checked and send more specific errors back to sender +else + + echo " + Message from: $FROM + Subject: [RETURNED MAIL] $SUBJECT + $DATE + + [ It was not possible to process this message. Either or both + the message was not encrypted and/or signed, or you are not + subscribed to this list. Contact the list administrator if + you have any questions. ] + + -- + firma v0.2.2" | $MAIL -r $LISTNAME $FROMADD + +fi + +rm -f $TMP $TMP.gpg |