Adding misc files

10 files changed, 1335 insertions, 0 deletions

diff --git a/misc/poc/README b/misc/poc/README
new file mode 100644
index 0000000..693db64
--- /dev/null
+++ b/misc/poc/README
@@ -0,0 +1 @@
+Proof of concept and initial versions.
diff --git a/misc/poc/firma-0.1 b/misc/poc/firma-0.1
new file mode 100755
index 0000000..eab39e6
--- /dev/null
+++ b/misc/poc/firma-0.1
@@ -0,0 +1,53 @@
+#!/bin/bash
+#
+# firma v0.1: simple encrypted mailing list aliases
+# feedback: rhatto@riseup.net | GPL
+#
+# list configuration is passed thru the 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
+
+# eval the config file
+source $1
+
+GPGCOMMAND="$GPG -q --homedir $GPGDIR"
+GPGLIST="$GPGCOMMAND --list-keys" 
+GPGDECRYPT="$GPGCOMMAND --decrypt"
+GPGENCRYPT="$GPGCOMMAND --always-trust -e -s -a -r" 
+
+rm $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 >> $TMP
+done
+
+# get the headers
+FROM=$(grep -m 1 ^From: $TMP | cut -f 2 -d :)
+DATE=$(grep -m 1 ^Date: $TMP)
+SUBJECT=$(grep -m 1 ^Subject: $TMP)
+
+# detect the encrypted message
+sed -n '/-----BEGIN PGP MESSAGE-----/,/-----END PGP MESSAGE-----/p' $TMP >> $TMP.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 $TMP.gpg)" | sed -e 's/=20$//' | $GPGENCRYPT $EMAIL | $MAIL -r $LISTNAME $EMAIL 
+
+done
+ 
+rm $TMP $TMP.gpg
diff --git a/misc/poc/firma-0.1.5 b/misc/poc/firma-0.1.5
new file mode 100755
index 0000000..029a09d
--- /dev/null
+++ b/misc/poc/firma-0.1.5
@@ -0,0 +1,57 @@
+#!/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
+
+# eval the config file
+source $1
+
+GPGCOMMAND="$GPG -q --homedir $GPGDIR"
+GPGLIST="$GPGCOMMAND --list-keys" 
+GPGDECRYPT="$GPGCOMMAND --decrypt"
+GPGENCRYPT="$GPGCOMMAND --always-trust -e -s -a -r" 
+
+rm $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 >> $TMP
+done
+
+# get the headers
+FROM=$(grep -m 1 ^From: $TMP | cut -f 2 -d :)
+DATE=$(grep -m 1 ^Date: $TMP)
+SUBJECT=$(grep -m 1 ^Subject: $TMP)
+
+# detect the encrypted message
+sed -n '/-----BEGIN PGP MESSAGE-----/,/-----END PGP MESSAGE-----/p' $TMP >> $TMP.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 $TMP.gpg)
+
+  ---
+  $FOOTER " | sed -e 's/=20$//' | $GPGENCRYPT $EMAIL | $MAIL -r $LISTNAME $EMAIL 
+
+done
+ 
+rm $TMP $TMP.gpg
diff --git a/misc/poc/firma-0.1.6 b/misc/poc/firma-0.1.6
new file mode 100755
index 0000000..239c9a5
--- /dev/null
+++ b/misc/poc/firma-0.1.6
@@ -0,0 +1,147 @@
+#!/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
diff --git a/misc/poc/firma-0.2 b/misc/poc/firma-0.2
new file mode 100755
index 0000000..5cf85d2
--- /dev/null
+++ b/misc/poc/firma-0.2
@@ -0,0 +1,108 @@
+#!/bin/bash
+#
+# firma v0.2: 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
+
+# eval the config file
+source $1
+
+# declare GPG variables
+GPGCOMMAND="$GPG --quiet --homedir $GPGDIR --batch --no-tty --no-use-agent --no-permission-warning"
+GPGLIST="$GPGCOMMAND --list-keys"
+GPGDECRYPT="$GPGCOMMAND --passphrase-fd 0 --decrypt"
+GPGENCRYPT="$GPGCOMMAND --passphrase-fd 0 --always-trust --encrypt --sign --armor --recipient"
+
+# 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 {
+  $GPGLIST | sed -n "/$LISTNAME/d;/pub/p" | 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
+# todo: find a better place for $FROMADD since its not part of the message headers
+FROM=$(grep -m 1 ^From: $TMP | cut -f 2 -d :)
+FROMADD=$(echo $FROMADD | if grep -q '<' ; then echo $FROMADD | grep -o '<.*>' | sed -e 's/[<>]//g' ; else echo $FROMADD ; fi)
+DATE=$(grep -m 1 ^Date: $TMP)
+SUBJECT=$(grep -m 1 ^Subject: $TMP | cut -f 2 -d :)
+
+# get the encrypted message
+sed -n '/-----BEGIN PGP MESSAGE-----/,/-----END PGP MESSAGE-----/p' $TMP >> $TMP.gpg
+
+# if signature is OK, encrypt and send it for each list subscriber
+# todo: declare a function to decrypt, re-encrypt and send the list messages
+if (GPGSTDERR | grep -q 'GOODSIG') ; then
+
+  for EMAIL in $(SUBSCRIBERS); do 
+
+    echo "$PASSWD
+    Message from: $FROM
+    Subject: $SUBJECT
+    $DATE
+
+    $(GPGSTDERR | grep 'gpg: Signature made')
+    $(GPGSTDERR | grep 'gpg: Good signature from')
+
+$(echo "$PASSWD" | $GPGDECRYPT $TMP.gpg 2> /dev/null)" | sed -e 's/=20$//' | $GPGENCRYPT $EMAIL | $MAIL -r $LISTNAME $EMAIL
+
+  done
+
+# else, if signature is BAD, email it back to sender and to list admins
+elif (GPGSTDERR | grep -q 'BADSIG') ; then
+
+    echo "$PASSWD
+    Message from: $FROM
+    Subject: [BAD SIGNATURE] $SUBJECT
+    $DATE
+
+    $(GPGSTDERR | grep 'gpg: Signature made')
+    $(GPGSTDERR | grep 'gpg: BAD signature from')
+
+$(echo "$PASSWD" | $GPGDECRYPT $TMP.gpg 2> /dev/null)" | sed -e 's/=20$//' | $GPGENCRYPT $LISTADMIN $FROMADD | $MAIL -r $LISTNAME $LISTADMIN $FROMADD
+
+# 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" | $MAIL -r $LISTNAME $FROMADD
+
+fi
+ 
+rm -f $TMP $TMP.gpg
diff --git a/misc/poc/firma-0.2.1 b/misc/poc/firma-0.2.1
new file mode 100755
index 0000000..13ee6da
--- /dev/null
+++ b/misc/poc/firma-0.2.1
@@ -0,0 +1,133 @@
+#!/bin/bash
+#
+# firma v0.2.1: 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
+
+# eval the config file
+source $1
+
+# declare GPG variables
+GPGCOMMAND="$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 --hidden-recipient"
+
+# check configuration file parameters
+# todo: check if $TMP directory/files exist and if password is at least n characters long
+if [ ! -x $GPG -o ! -f $GPG ]; then
+  echo -e "\n$1: GPG binary ($GPG) could not be found.\n"
+  exit
+elif [ ! -x $MAIL -o ! -f $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 $($GPGLIST | grep -o "<$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 -o "<$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 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 {
+  $GPGLIST | sed -n "/$LISTNAME/d;/pub/p" | 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
+# todo: find a better place for $FROMADD since its not part of the message headers
+FROM=$(grep -m 1 "^From:" $TMP | cut -d : -f 2- | sed "s/^ //")
+FROMADD=$(echo $FROM | if grep -q "<" ; then echo $FROM | grep -o "<.*>" | sed -e "s/[<>]//g" ; else echo $FROM ; fi)
+DATE=$(grep -m 1 "^Date:" $TMP)
+SUBJECT=$(grep -m 1 "^Subject:" $TMP | cut -d : -f 2- | sed "s/^ //")
+
+# get the encrypted message
+sed -n "/-----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 -q "GOODSIG") ; then
+
+  for EMAIL in $(SUBSCRIBERS); do 
+
+    echo "$PASSWD
+    Message from: $FROM
+    Subject: $SUBJECT
+    $DATE
+
+    $(GPGSTDERR | grep "gpg: Signature made")
+    $(GPGSTDERR | grep "gpg: Good signature from")
+
+$(echo "$PASSWD" | $GPGDECRYPT $TMP.gpg 2> /dev/null)" | sed -e "s/=20$//" | $GPGENCRYPT $EMAIL | $MAIL -r $LISTNAME $EMAIL
+
+  done
+
+# else, if signature is BAD, email it back to sender and to list admins
+elif (GPGSTDERR | grep -q "BADSIG") ; then
+
+    echo "$PASSWD
+    Message from: $FROM
+    Subject: [BAD SIGNATURE] $SUBJECT
+    $DATE
+
+    $(GPGSTDERR | grep "gpg: Signature made")
+    $(GPGSTDERR | grep "gpg: BAD signature from")
+
+$(echo "$PASSWD" | $GPGDECRYPT $TMP.gpg 2> /dev/null)" | sed -e "s/=20$//" | $GPGENCRYPT $LISTADMIN $FROMADD | $MAIL -r $LISTNAME $LISTADMIN $FROMADD
+
+# 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 v0.2.1" | $MAIL -r $LISTNAME $FROMADD
+
+fi
+ 
+rm -f $TMP $TMP.gpg
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
diff --git a/misc/poc/firma-0.2.3 b/misc/poc/firma-0.2.3
new file mode 100755
index 0000000..2864115
--- /dev/null
+++ b/misc/poc/firma-0.2.3
@@ -0,0 +1,192 @@
+#!/bin/bash
+#
+# firma v0.2.3: encrypted mailing list manager
+# 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
+#
+
+VERSION=0.2.3
+
+function usage {
+  echo usage: $0 firma \<option\> \<config-file\>
+  echo -c: create a new list using config-file
+  echo -p: process a message 
+  echo -a: admin commands
+}
+
+function check_config {
+  # 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 1
+  elif [ ! -f $MAIL -o ! -x $MAIL ]; then
+    echo -e "\n$1: Mail program ($MAIL) could not be found.\n"
+    exit 1
+  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 1
+  elif [ -z "$(cat $CONFIG | grep -o ^PASSWD=\'[^\']*\'$)" -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 $PASSWD | grep -o [[:punct:]] | wc -l)" -lt "5" ]; then
+    echo -e "\n$CONFIG: 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 "$1: 5 special characters) and enclose it in 'single quotes'. The passphrase"
+    echo -e "$CONFIG: itself, though, cannot contain any single quote.\n"
+    exit 1
+  elif [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$LISTNAME\>$)" ]; then
+    echo -e "\n$CONFIG: GPG key for list \"$LISTNAME\" could not be found."
+    echo -e "$CONFIG: Note that this parameter expects an email address.\n"
+    exit 1
+  else
+    for ADMIN in $LISTADMIN; do {
+      if [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$ADMIN\>$)" ]; then
+        echo -e "\n$CONFIG: GPG key for list administrator \"$ADMIN\" could not be found."
+        echo -e "$CONFIG: Note that this parameter expects one or more space separated email addresses.\n"
+        exit 1
+      fi; }
+    done
+  fi
+}
+
+function GPGSTDERR {
+  # discard $GPGDECRYPT STDOUT and get its STDERR instead, for signature checking
+  echo $PASSWD | ($GPGDECRYPT --status-fd 2 $TMP.gpg 1> /dev/null) 2>&1 ;
+}
+
+function SUBSCRIBERS {
+  # get list susbscriber's addresses
+  $GPGLIST | sed -ne "/$LISTNAME/Id" -e '/pub/p' | cut -d : -f 10 | grep -o '<[^<>]*>$' | sed -e 's/[<>]//g' ;
+}
+
+function process_message {
+  # process a message sent to the list
+
+  # 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
+    $DATE
+  
+    [ It was not possible to process this message. Either or both
+      the message was not encrypted and/or signed, or you are not
+      subscribed to this list.  Contact the list administrator if
+      you have any questions. ]
+ 
+    -- 
+    firma v$VERSION" | $MAIL -r $LISTNAME $FROMADD
+  
+  fi
+   
+  rm -f $TMP $TMP.gpg
+  
+}
+
+# main -
+# command line checking
+if [ -z $2 ]; then
+  usage; exit 1
+else
+  CONFIG=$2
+fi
+
+# if the configuration file exists, disable "sourcepath" and evaluate the parameters
+if [ -f $CONFIG ] && [[ $1 != "-c" ]]; then
+  shopt -u sourcepath && source $CONFIG
+else
+  echo -e "\nConfiguration file \"$CONFIG\" could not be found.\n"
+  exit 1
+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"
+
+# then check the config
+check_config
+
+# command line parsing
+if [[ $1 == "-c" ]]; then
+  newlist 
+elif [[ $1 == "-p" ]]; then
+  process_message
+elif [[ $1 == "-a" ]]; then
+  admin_task
+else
+  usage; exit 1
+fi 
+ 
diff --git a/misc/poc/firma-0.2.4 b/misc/poc/firma-0.2.4
new file mode 100755
index 0000000..6418782
--- /dev/null
+++ b/misc/poc/firma-0.2.4
@@ -0,0 +1,211 @@
+#!/bin/bash
+#
+# firma v0.2.4: encrypted mailing list manager
+# 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
+# LISTNAME= list email
+# LISTADMIN= list administrator email addresses (space separated)
+# GPGDIR= gpg dir for the lists' keyring
+# PASSWD= passwd for the lists' keyring
+#
+
+VERSION=0.2.4
+
+function usage {
+  echo usage: $0 firma \<option\> \<config-file\>
+  echo -c: create a new list using config-file
+  echo -p: process a message 
+  echo -a: admin commands
+}
+
+function check_config {
+  # check configuration file parameters
+  if [ ! -f $GPG -o ! -x $GPG ]; then
+    echo -e "\n$1: GPG binary ($GPG) could not be found.\n"
+    exit 1
+  elif [ ! -f $MAIL -o ! -x $MAIL ]; then
+    echo -e "\n$1: Mail program ($MAIL) could not be found.\n"
+    exit 1
+  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 1
+  elif [ -z "$(cat $CONFIG | grep -o ^PASSWD=\'[^\']*\'$)" -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 $PASSWD | grep -o [[:punct:]] | wc -l)" -lt "5" ]; then
+    echo -e "\n$CONFIG: 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 "$1: 5 special characters) and enclose it in 'single quotes'. The passphrase"
+    echo -e "$CONFIG: itself, though, cannot contain any single quote.\n"
+    exit 1
+  elif [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$LISTNAME\>$)" ]; then
+    echo -e "\n$CONFIG: GPG key for list \"$LISTNAME\" could not be found."
+    echo -e "$CONFIG: Note that this parameter expects an email address.\n"
+    exit 1
+  else
+    for ADMIN in $LISTADMIN; do {
+      if [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$ADMIN\>$)" ]; then
+        echo -e "\n$CONFIG: GPG key for list administrator \"$ADMIN\" could not be found."
+        echo -e "$CONFIG: Note that this parameter expects one or more space separated email addresses.\n"
+        exit 1
+      fi; }
+    done
+  fi
+}
+
+function GPGSTDERR {
+  # discard $GPGDECRYPT STDOUT and get its STDERR instead, for signature checking
+  echo -e "$PASSWD\n${GPG_MESSAGE[@]}" | sed -e 's/^ //' | ($GPGDECRYPT --status-fd 2 1> /dev/null) 2>&1 ;
+}
+
+function SUBSCRIBERS {
+  # get list susbscriber's addresses
+  $GPGLIST | sed -ne "/$LISTNAME/Id" -e '/pub/p' | cut -d : -f 10 | grep -o '<[^<>]*>$' | sed -e 's/[<>]//g' ;
+}
+
+function get_message {
+  n=0;
+  while read STDIN; do
+    MESSAGE[$n]="$STDIN\n"
+    ((++n))
+  done
+}
+
+function get_gpg_message {
+  signal=0; x=0;
+  for ((count=0;count<=n;count++)); do
+    if [[ $signal == "0" ]] && [[ "$(echo "${MESSAGE[$count]}" | grep -v -e "-----BEGIN PGP MESSAGE-----")" == "" ]]; then
+      GPG_MESSAGE[$x]=${MESSAGE[$count]}; ((++x))
+      signal=1
+    elif [[ $signal == "1" ]]; then
+      GPG_MESSAGE[$x]=${MESSAGE[$count]}
+      ((++x))
+      if [[ "$(echo "${MESSAGE[$count]}" | grep -v -e "-----END PGP MESSAGE-----")" == "" ]]; then
+        signal=0
+      fi
+    fi
+  done
+}
+
+function get_headers {
+  # get the message headers and the sender's email address
+  FROM=$(echo -e "${MESSAGE[@]}" | grep -m 1 "From:" | cut -d : -f 2- | sed -e 's/^ //')
+  FROMADD=$(if [ -z "$(echo $FROM | grep '>$')" ] ; then echo $FROM ; else echo $FROM | grep -o '<[^<>]*>$' | sed -e 's/[<>]//
+g' ; fi)
+  DATE=$(echo -e "${MESSAGE[@]}" | grep -m 1 "Date:")
+  SUBJECT=$(echo -e "${MESSAGE[@]}" | grep -m 1 "Subject:" | cut -d : -f 2- | sed -e 's/^ //')
+}
+
+function process_message {
+  # process a message sent to the list
+
+  get_message
+  get_headers 
+  get_gpg_message
+
+  # 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')
+  
+  $(echo -e "$PASSWD\n${GPG_MESSAGE[@]}" | $GPGDECRYPT 2> /dev/null)" | sed -e 's/=20$//' | $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')
+  
+  $(echo -e "$PASSWD\n${GPG_MESSAGE[@]}" | $GPGDECRYPT 2> /dev/null)" | sed -e 's/=20$//' | $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
+    $DATE
+  
+    [ It was not possible to process this message. Either or both
+      the message was not encrypted and/or signed, or you are not
+      subscribed to this list.  Contact the list administrator if
+      you have any questions. ]
+ 
+    -- 
+    firma v$VERSION" | $MAIL -r $LISTNAME $FROMADD
+  
+  fi
+   
+}
+
+# main -
+# command line checking
+if [ -z $2 ]; then
+  usage; exit 1
+else
+  CONFIG=$2
+fi
+
+# if the configuration file exists, disable "sourcepath" and evaluate the parameters
+if [ -f $CONFIG ] && [[ $1 != "-c" ]]; then
+  shopt -u sourcepath && source $CONFIG
+else
+  echo -e "\nConfiguration file \"$CONFIG\" could not be found.\n"
+  exit 1
+fi
+
+declare -a MESSAGE
+declare -a GPG_MESSAGE
+declare n
+export LANG=en_US
+
+# 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"
+
+# then check the config
+check_config
+
+# command line parsing
+if [[ $1 == "-c" ]]; then
+  newlist 
+elif [[ $1 == "-p" ]]; then
+  process_message
+elif [[ $1 == "-a" ]]; then
+  admin_task
+else
+  usage; exit 1
+fi 
+ 
diff --git a/misc/poc/firma-0.2.x b/misc/poc/firma-0.2.x
new file mode 100755
index 0000000..126f998
--- /dev/null
+++ b/misc/poc/firma-0.2.x
@@ -0,0 +1,280 @@
+#!/bin/bash
+#
+# firma v0.3: encrypted mailing list manager
+# 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
+# LISTNAME= list email
+# LISTADMIN= list administrator email addresses (space separated)
+# GPGDIR= gpg dir for the lists' keyring
+# PASSWD= passwd for the lists' keyring
+#
+
+FIRMA_LIST_PATH=/usr/local/etc/lists
+VERSION=0.3
+
+# todo:
+# errase all vars before quit the game
+# unset MESSAGE
+# unset GPG_MESSAGE
+# umask ....
+
+function usage {
+  echo usage: $0 firma \<option\> \<config-file\>
+  echo -c: create a new list using config-file
+  echo -p: process a message 
+  echo -r: admin and user requests (mail only)
+  echo -a: admin commands
+}
+
+function check_config {
+  # check configuration file parameters
+  if [ ! -f $GPG -o ! -x $GPG ]; then
+    echo -e "\n$1: GPG binary ($GPG) could not be found.\n"
+    exit 1
+  elif [ ! -f $MAIL -o ! -x $MAIL ]; then
+    echo -e "\n$1: Mail program ($MAIL) could not be found.\n"
+    exit 1
+  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 1
+  elif [ -z "$(cat $CONFIG | grep -o ^PASSWD=\'[^\']*\'$)" -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 $PASSWD | grep -o [[:punct:]] | wc -l)" -lt "5" ]; then
+    echo -e "\n$CONFIG: 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 "$1: 5 special characters) and enclose it in 'single quotes'. The passphrase"
+    echo -e "$CONFIG: itself, though, cannot contain any single quote.\n"
+    exit 1
+  elif [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$LISTNAME\>$)" ]; then
+    echo -e "\n$CONFIG: GPG key for list \"$LISTNAME\" could not be found."
+    echo -e "$CONFIG: Note that this parameter expects an email address.\n"
+    exit 1
+  else
+    for ADMIN in $LISTADMIN; do {
+      if [ -z "$($GPGLIST | grep ^pub | cut -d : -f 10 | grep -i \<$ADMIN\>$)" ]; then
+        echo -e "\n$CONFIG: GPG key for list administrator \"$ADMIN\" could not be found."
+        echo -e "$CONFIG: Note that this parameter expects one or more space separated email addresses.\n"
+        exit 1
+      fi; }
+    done
+  fi
+}
+
+function GPGSTDERR {
+  # discard $GPGDECRYPT STDOUT and get its STDERR instead, for signature checking
+  echo -e "$PASSWD\n${GPG_MESSAGE[@]}" | sed -e 's/^ //' | ($GPGDECRYPT --status-fd 2 1> /dev/null) 2>&1 ;
+}
+
+function SUBSCRIBERS {
+  # get list susbscriber's addresses
+  $GPGLIST | sed -ne "/$LISTNAME/Id" -e '/pub/p' | cut -d : -f 10 | grep -o '<[^<>]*>$' | sed -e 's/[<>]//g' ;
+}
+
+function get_message {
+  n=0;
+  while read STDIN; do
+    MESSAGE[$n]="$STDIN\n"
+    ((++n))
+  done
+}
+
+function get_gpg_message {
+  signal=0; x=0;
+  for ((count=0;count<=n;count++)); do
+    if [[ $signal == "0" ]] && [[ "$(echo "${MESSAGE[$count]}" | grep -v -e "-----BEGIN PGP MESSAGE-----")" == "" ]]; then
+      GPG_MESSAGE[$x]=${MESSAGE[$count]}; ((++x))
+      signal=1
+    elif [[ $signal == "1" ]]; then
+      GPG_MESSAGE[$x]=${MESSAGE[$count]}
+      ((++x))
+      if [[ "$(echo "${MESSAGE[$count]}" | grep -v -e "-----END PGP MESSAGE-----")" == "" ]]; then
+        signal=0
+      fi
+    fi
+  done
+}
+
+function get_headers {
+  # get the message headers and the sender's email address
+  FROM=$(echo -e "${MESSAGE[@]}" | grep -m 1 "From:" | cut -d : -f 2- | sed -e 's/^ //')
+  FROMADD=$(if [ -z "$(echo $FROM | grep '>$')" ] ; then echo $FROM ; else echo $FROM | grep -o '<[^<>]*>$' | sed -e 's/[<>]//
+g' ; fi)
+  DATE=$(echo -e "${MESSAGE[@]}" | grep -m 1 "Date:")
+  SUBJECT=$(echo -e "${MESSAGE[@]}" | grep -m 1 "Subject:" | cut -d : -f 2- | sed -e 's/^ //')
+}
+
+function message_list {
+# compose and send a message to the list
+# $1: subscriber email
+# sorry no identation :P  
+echo "$PASSWD
+Message from: $FROM
+Subject: $SUBJECT
+$DATE
+  
+$(GPGSTDERR | grep -F 'gpg: Signature made')
+$(GPGSTDERR | grep -F 'gpg: Good signature from')
+  
+$(echo -e "$PASSWD\n${GPG_MESSAGE[@]}" | $GPGDECRYPT 2> /dev/null)" | sed -e 's/=20$//' | $GPGENCRYPT $1 | $MAIL -r $LISTNAME $1
+}
+
+function message_list_error {
+# compose and send an error message
+# sorry no identation :P  
+echo "$PASSWD
+Message from: $FROM
+Subject: [BAD SIGNATURE] $SUBJECT
+$DATE
+  
+$(GPGSTDERR | grep -F 'gpg: Signature made')
+$(GPGSTDERR | grep -F 'gpg: BAD signature from')
+ 
+$(echo -e "$PASSWD\n${GPG_MESSAGE[@]}" | $GPGDECRYPT 2> /dev/null)" | sed -e 's/=20$//' | $GPGENCRYPT $1 | $MAIL -r $LISTNAME $1
+}
+
+function message_list_return {
+# send a bouce message
+# $1: sender email (usually $FROMADD)
+# sorry no identation :P  
+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 v$VERSION" | $MAIL -r $LISTNAME $1
+}
+
+function process_message {
+  # process a message sent to the list
+
+  get_message
+  get_headers 
+  get_gpg_message
+
+  # 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 
+      message_list $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
+      message_list_error $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
+    message_list_return $FROMADD 
+  fi
+   
+}
+
+function newlist {
+  # create a list if it doesnt already exist
+  if [ ! -d "$CONFIG_PATH" ]; then
+    echo creating folder $CONFIG_PATH...
+    mkdir "$CONFIG_PATH" # || (echo "error creating $CONFIG_PATH: installation aborted"; exit 1)
+    echo "creating list config file and will ask some questions."
+
+    GPGDIR="$CONFIG_PATH"  
+ 
+    read -p "path to nail command (eg, /usr/bin/nail): " MAIL
+    read -p "path to gpg binary (eg, /usr/bin/gpg): " GPG
+
+    # if [ ! -x $GPG ]; then 
+
+    read -p "list keyring folder (defaults to $GPGDIR): " GPGDIR
+
+    # todo: please no utf-8 (see DETAILS)
+    read -p "list email (eg, firma@domain.tld): " LISTNAME
+    read -p "list admins emails (space delimited)" LISTADMIN
+    read -p "password for list keyring (use a huge one): " PASSWD 
+
+    # todo: key specs (size, expiry date...)
+
+    echo "creating your config..."
+    touch $CONFIG
+    chown root.root $CONFIG
+    chmod 600 $CONFIG
+    if [ -f $CONFIG ]; then
+      echo -e "MAIL=$MAIL\nGPG=$GPG\nGPGDIR=$GPGDIR\nLISTNAME=$LISTNAME\nLISTADMIN=$LISTADMIN\nPASSWD=$PASSWD" > $CONFIG
+      echo "now generating your keyring..."
+      # re-eval GPGCOMMAND
+      # todo: GPGFLAGS depende de GPGDIR
+      GPGCOMMAND="$GPG $GPGFLAGS"
+      $GPGCOMMAND --gen-key  
+
+    fi
+  else
+    echo error creating $CONFIG_FILE: list already exists
+    exit 1 
+  fi
+}
+
+# main -
+# command line checking
+if [ -z $2 ]; then
+  usage; exit 1
+else
+  CONFIG_FILE="$2"
+  CONFIG_PATH="$FIRMA_LIST_PATH/$2"
+  CONFIG="$CONFIG_PATH/$2.conf"
+fi
+
+# if the configuration file exists, disable "sourcepath" and evaluate the parameters
+if [ -f $CONFIG ] && [[ $1 != "-c" ]]; then
+  shopt -u sourcepath && source $CONFIG
+else
+  echo -e "\nConfiguration file \"$CONFIG\" could not be found.\n"
+  exit 1
+fi
+
+declare -a MESSAGE
+declare -a GPG_MESSAGE
+declare n
+export LANG=en_US
+
+# declare GPG variables
+GPGFLAGS="--quiet --homedir $GPGDIR --batch --no-tty --no-use-agent --no-permission-warning"
+GPGCOMMAND="$GPG $GPGFLAGS"
+GPGLIST="$GPGCOMMAND --list-keys --with-colons"
+GPGDECRYPT="$GPGCOMMAND --passphrase-fd 0 --decrypt"
+GPGENCRYPT="$GPGCOMMAND --passphrase-fd 0 --always-trust --encrypt --sign --armor --recipient"
+
+# then check the config
+check_config
+
+# command line parsing
+if [[ $1 == "-c" ]]; then
+  newlist 
+elif [[ $1 == "-p" ]]; then
+  process_message
+elif [[ $1 == "-a" ]]; then
+  list_admin
+elif [[ $1 == "-r" ]]; then
+  list_request
+else
+  usage; exit 1
+fi 
+