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/usr/bin/openvas-mkcert-client is in openvas-server 2.0.3-4.

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The actual contents of the file can be viewed below.

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#!/bin/sh

# OpenVAS
# $Id: openvas-mkcert-client.in 2273 2009-01-20 11:21:59Z mwiegand $
# Description: create SSL client certificates.
#
# Authors: - Michel Arboi <arboi@alussinan.org> (Original pre-fork develoment)
#          - Tim Brown <mailto:timb@openvas.org> (Initial fork)
#          - Laban Mwangi <mailto:labanm@openvas.org> (Renaming work)
#          - Tarik El-Yassem <mailto:tarik@openvas.org> (Headers section)
#
# Copyright:
# Portions Copyright (C) 2006 Software in the Public Interest, Inc.
# Based on work Copyright (C) 1998 - 2006 Tenable Network Security, Inc.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2,
# as published by the Free Software Foundation
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
#
#
#


case `echo -n` in
\-n)	Xn=   ; Xc='\c' ;;
*)	Xn=-n ; Xc=
esac

umask 022

prefix=/usr
datarootdir=${prefix}/share
datadir=${datarootdir}
sysconfdir=/etc
localstatedir=/var
sharedstatedir=${prefix}/com
sbindir=${prefix}/sbin
bindir=${prefix}/bin
egdpath=

RANDFLAG=""
test -n "$egdpath" && 
{
 RANDFLAG="-rand $egdpath"
}

PATH=$PATH:$sbindir:$bindir:/usr/ssl/bin:/usr/local/ssl/bin:/opt/ssl/bin

# check if gettext is present

GETTEXT=`command -v gettext.sh`
if $(( $? ));
then

  # define dummy functions

  gettext () {
    echo $Xn "$1" $Xc
  }

  eval_gettext () {
    eval_gettext_var="echo $1"
    echo $Xn `eval $eval_gettext_var` $Xc
  }

else

  # initialize gettext

  . $GETTEXT
  export TEXTDOMAIN=nessus-scripts
  export TEXTDOMAINDIR=${datarootdir}/locale

fi


Bo='('
Bc=')'
Hash='#'

echo_no_nl ()
{
    echo $Xn "$*$Xc"
}


header()
{
clear
echo "-------------------------------------------------------------------------------"
gettext "			Creation OpenVAS SSL Client Certificate"; echo
echo "-------------------------------------------------------------------------------"
echo
}
#

#
# We need openssl
#
case `openssl version` in 
 OpenSSL*)
     ;;
 *)
   gettext "OpenSSL is not properly installed: The 'openssl' command line utility could not be found (is your \$PATH set properly?)"; echo
   exit 1
esac
     
# Check environment
if [ -z "$HOME" ]; then
    gettext "\$HOME should be defined." 1>&2; echo; exit 1
fi

#
# If EGD is not installed, we have to rely on other sources
# of entropy
# 
test -z "$RANDFLAG" -a -z "$RANDFILE" &&
{
 if [ ! -r /dev/random -a ! -r /dev/urandom -a ! -r $HOME/.rnd ];
  then
   header
   gettext "You do not have any suitable random source."; echo
   gettext "You will be asked to type a few random keys on your keyboard to generate random bytes."; echo
   openvas-mkrand $HOME/.rnd 1024 
   gettext "Press [ENTER] to continue..."; echo
  fi
}



OPENVASPRIV="${localstatedir}/lib/openvas/private/CA"
OPENVASPUB="${localstatedir}/lib/openvas/CA"

while [ ! -d "$OPENVASPRIV" ]; do
    gettext "OpenVAS server 'private' directory: "
    read OPENVASPRIV
done

while [ ! -d "$OPENVASPUB" ]; do
    gettext "OpenVAS server 'public' directory: "
    read OPENVASPUB
done

CAKEY=$OPENVASPRIV/cakey.pem
CACERT=$OPENVASPUB/cacert.pem

[ -r "$CAKEY" ] || echo "WARN: $CAKEY is not readable, this script will not be able to find the server certificate (hint: are you root?)"

while [ ! -f "$CAKEY" ]; do
    eval_gettext "\$CAKEY: not found or not a file."
    gettext "OpenVAS CA private key: "
    read CAKEY
done

while [ ! -f "$CACERT" ]; do
    eval_gettext "\$CACERT: not found or not a file."
    gettext "OpenVAS CA certificate: "
    read CACERT
done

for F in "$CAKEY" "$CACERT"; do 
    if [ ! -r "$F" ]; then
	eval_gettext "Cannot read \$F" 1>&2; echo; exit 1
    fi
done

R=x
while [ "$R" != `gettext "y"` -a "$R" != `gettext "n"` ]; do
    gettext "Do you want to register the users in the OpenVAS server as soon as you create their certificates? (y/n): "
    read R
done

if [ "$R" = `gettext "y"` ]; then
    USERSDIR=$localstatedir/lib/openvas/users
    while [ ! -d "$USERSDIR" ]; do
	eval_gettext "\$USERSDIR: not a directory."; echo
	gettext "Users directory? "
	read USERSDIR
    done
else
    USERSDIR=""
fi

umask 066

# Set environment
BASEDIR=${TMPDIR-/tmp}/openvas-mkcert.$$
mkdir $BASEDIR || exit 1


gettext "This script will now ask you the relevant information to create the SSL client certificates for OpenVAS."; echo

gettext "Client certificates life time in days [365]: "; read x
DFL_CERT_LIFETIME=${x:-365}

# Default country = France - Too bad for you, but quicker for my tests!
if [ ! -z "$LANG" ]; then
    DC=`echo $LANG | sed -n 's/^..*_\(..\)$/\1/p'`
fi
X=${DC:=FR}
eval_gettext "Your country \${Bo}two letter code\${Bc} [\$X]: "; read x
DFL_COUNTRY=${x:-$DC}
gettext "Your state or province name [none]: "; read DFL_PROVINCE
X=Paris; 
eval_gettext "Your location \${Bo}e.g. town\${Bc} [\$X]: "; read x
DFL_LOCATION=${x:-$X}
gettext "Your organization [none]: "; read DFL_ORGANIZATION
gettext "Your organizational unit [none]: "; read DFL_ORGUNIT

#

cat <<EOF>$BASEDIR/stdC.cnf
RANDFILE		= $HOME/.rnd
#
[ ca ]
default_ca = OpenVASCA

[ OpenVASCA ]
dir		= $BASEDIR		# Where everything is kept
certs		= \$dir			# Where the issued certs are kept
crl_dir		= \$dir			# Where the issued crl are kept
database	= \$dir/index.txt	# database index file.
new_certs_dir	= \$dir			# default place for new certs.

certificate	= $CACERT	 	# The CA certificate
serial		= \$dir/serial 		# The current serial number
crl		= \$dir/crl.pem 	# The current CRL
private_key	= $CAKEY		# The private key

x509_extensions	= usr_cert		# The extentions to add to the cert
crl_extensions	= crl_ext

default_days	= 365		# how long to certify for
default_crl_days= 30			# how long before next CRL
default_md	= md5			# which md to use.
preserve	= no			# keep passed DN ordering

policy		= policy_anything

[ policy_anything ]
countryName             = optional
stateOrProvinceName     = optional
localityName            = optional
organizationName        = optional
organizationalUnitName  = optional
commonName              = supplied
emailAddress            = optional

[ req ]
default_bits		= 1024
distinguished_name	= req_distinguished_name
# attributes		= req_attributes
x509_extensions	= v3_ca	# The extentions to add to the self signed cert

[ req_distinguished_name ]
countryName			= Country Name (2 letter code)
countryName_default		= FR
countryName_min			= 2
countryName_max			= 2

stateOrProvinceName		= State or Province Name (full name)
stateOrProvinceName_default	= Some-State

localityName			= Locality Name (eg, city)

0.organizationName		= Organization Name (eg, company)
0.organizationName_default	= Internet Widgits Pty Ltd

# we can do this but it is not needed normally :-)
#1.organizationName		= Second Organization Name (eg, company)
#1.organizationName_default	= World Wide Web Pty Ltd

organizationalUnitName		= Organizational Unit Name (eg, section)
#organizationalUnitName_default	=

commonName			= Common Name (eg, your name or your server\'s hostname)
commonName_max			= 64

emailAddress			= Email Address
emailAddress_max		= 40

# SET-ex3			= SET extension number 3

[ usr_cert ]
# These extensions are added when 'ca' signs a request.
# This goes against PKIX guidelines but some CAs do it and some software
# requires this to avoid interpreting an end user certificate as a CA.
#basicConstraints=CA:FALSE

# Here are some examples of the usage of nsCertType. If it is omitted
# the certificate can be used for anything *except* object signing.

# This is OK for an SSL server.
# nsCertType			= nsCertType
# For normal client use this is typical
# nsCertType = client, email
nsCertType			= client

keyUsage = nonRepudiation, digitalSignature, keyEncipherment

# This will be displayed in Netscape's comment listbox.
nsComment			= "OpenSSL Generated Certificate"

# PKIX recommendations harmless if included in all certificates.
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer:always

# This stuff is for subjectAltName and issuerAltname.
# Import the email address.
subjectAltName=email:copy

# Copy subject details
issuerAltName=issuer:copy

#nsCaRevocationUrl		= http://www.domain.dom/ca-crl.pem
#nsBaseUrl
#nsRevocationUrl
#nsRenewalUrl
#nsCaPolicyUrl
#nsSslServerName

[ v3_ca ]
# PKIX recommendation.
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid:always,issuer:always

# This is what PKIX recommends but some broken software chokes on critical
# extensions.
basicConstraints = critical,CA:true
# So we do this instead.
#basicConstraints = CA:true

# Key usage: this is typical for a CA certificate. However since it will
# prevent it being used as an test self-signed certificate it is best
# left out by default.
keyUsage = cRLSign, keyCertSign
nsCertType = sslCA
EOF

#
echo 01 > $BASEDIR/serial
touch $BASEDIR/index.txt

echo "**********"
gettext "We are going to ask you some question for each client certificate. "; echo
gettext "If some question has a default answer, you can force an empty answer by entering a single dot '.'"; echo
echo "*********"


I=1; ANOTHER=`gettext "y"`

while [ "$ANOTHER" != `gettext "n"` ]; do
    PSEUDO=""
    while [ -z "$PSEUDO" ]; do
	eval_gettext "User \${Hash}\$I name \${Bo}e.g. OpenVAS username\${Bc}: "
	read PSEUDO
	CERTFILE="$BASEDIR/cert_$PSEUDO.pem"
	KEYFILE="$BASEDIR/key_$PSEUDO.pem"
	REQFILE="$BASEDIR/req_$PSEUDO.pem"
	DNFILE="$USERSDIR/$PSEUDO/auth/dname" # Not wise if USERSDIR is not set
	if [ -f "$CERTFILE" -o -f "$KEYFILE" -o -f "$DNFILE" ]; then
	    A=""
	    while [ -z "$A" ]; do
		gettext "Certificate, key or OpenVAS DN file(s) already exist."; echo
		gettext "Do you want to go on and overwrite it/them? (y/n) "
		read A
		if [ "$A" = `gettext "n"` ]; then PSEUDO=""; fi
	    done
	fi
    done

    eval_gettext "Client certificates life time in days [\$DFL_CERT_LIFETIME]: "
    read x
    CERT_LIFETIME=${x:-$DFL_CERT_LIFETIME}
    X=$DFL_COUNTRY
    eval_gettext "Country \${Bo}two letter code\${Bc} [\$X]: "; read x
    COUNTRY=${x:-$DFL_COUNTRY}
    X=$DFL_PROVINCE
    eval_gettext "State or province name [\$X]: "; read x
    PROVINCE=${x:-$DFL_PROVINCE}
    X=$DFL_LOCATION
    eval_gettext "Location \${Bo}e.g. town\${Bc} [\$X]: "; read x
    LOCATION=${x:-$DFL_LOCATION}
    X=$DFL_ORGANIZATION
    eval_gettext "Organization [\$X]: "; read x
    ORGANIZATION=${x:-$DFL_ORGANIZATION}
    X=$DFL_ORGUNIT
    eval_gettext "Organization unit [\$X]: "; read x
    ORGUNIT=${x:-$DFL_ORGUNIT}
    gettext "e-Mail []: "; read EMAIL

    # Client key
    openssl genrsa -out $KEYFILE 1024

    # Client certificate "request"
echo "${COUNTRY:-.}
${PROVINCE:-.}
${LOCATION:-.}
${ORGANIZATION:-.}
${ORGUNIT:-.}
$PSEUDO
${EMAIL:-.}" | 
    openssl req -config $BASEDIR/stdC.cnf -new -key $KEYFILE -out $REQFILE

    # Sign the client certificate
    openssl ca -config $BASEDIR/stdC.cnf -name OpenVASCA -batch -days $CERT_LIFETIME -in $REQFILE -out $CERTFILE

    # Create export file for OpenVASWX
    NWX_CERTFILE=$BASEDIR/cert_nessuswx_$PSEUDO.pem
    cp $CERTFILE $NWX_CERTFILE
    cat $KEYFILE >> $NWX_CERTFILE

    chmod a+r $CERTFILE
    chmod a+r $NWX_CERTFILE

    if [ ! -z "$USERSDIR" ]; then

        # 
        # create the auth dir, which contains the user rules, 
        # password or cert, and plugin acl 
	D="$USERSDIR/$PSEUDO/auth"
	if [ ! -d "$D" ]; then
	    mkdir -p "$D"
	    chmod 700 "$D"
	fi

        # 
        # create the user auth/rules file 
      # 
      R="$USERSDIR/$PSEUDO/auth/rules" 
      echo 
      gettext "User rules"; echo 
      echo "----------" 
      eval_gettext "openvasd has a rules system which allows you to restrict the hosts that \$login has the right to test."; echo
      gettext "For instance, you may want him to be able to scan his own host only."; echo
      echo 
      gettext "Please see the openvas-adduser(8) man page for the rules syntax."; echo
      echo 
      gettext "Enter the rules for this user, and hit ctrl-D once you are done:"; echo

      tmpAddUserFile=$TMPDIR/rules.$$


      gettext "(the user can have an empty rules set)"; echo
      cat > $tmpAddUserFile || { 
              echo "Error - could not write $tmpAddUserFile" 
              exit 1 
      } 
      cp $tmpAddUserFile "$USERSDIR/$PSEUDO/auth/rules" 

      rm $tmpAddUserFile 

      # 
      # create the cert authentication file auth/dname 
      # 
	> $DNFILE
	[ ! -z "$COUNTRY" -a "$COUNTRY" != "." ] &&
	    echo_no_nl "/C=$COUNTRY" >> $DNFILE
	[ ! -z "$PROVINCE" -a "$PROVINCE" != "." ] &&
	    echo_no_nl "/ST=$PROVINCE" >> $DNFILE
	[ ! -z "$LOCATION" -a "$LOCATION" != "." ] &&
	    echo_no_nl "/L=$LOCATION" >> $DNFILE
	[ ! -z "$ORGANIZATION" -a "$ORGANIZATION" != "." ] && 
	    echo_no_nl "/O=$ORGANIZATION" >> $DNFILE
	[ ! -z "$ORGUNIT" -a "$ORGUNIT" != "." ] && 
	    echo_no_nl "/OU=$ORGUNIT" >> $DNFILE
	echo_no_nl "/CN=$PSEUDO" >> $DNFILE
	[ ! -z "$EMAIL" ] && echo_no_nl "/emailAddress=$EMAIL" >> $DNFILE

      # 
        # create the plugins dir, which contains the user plugins 
        # 
        E="$USERSDIR/$PSEUDO/plugins" 
        if [ ! -d "$E" ]; then 
            mkdir -p "$E" 
            chmod 700 "$E" 
        fi 
        gettext "User added to OpenVAS."; echo
    fi

    gettext "Another client certificate? (y/n) " 
    read ANOTHER 
    I=`expr $I + 1` 
done

eval_gettext "Your client certificates are in \$BASEDIR."; echo
gettext "You will have to copy them by hand."; echo