path: root/localmksslcerts

#!/bin/sh
#
# /usr/local/sbin/localmksslcerts
# Copyright 2001-2005 Jonas Smedegaard <dr@jones.dk>
#
# $Id: localmksslcerts,v 1.21 2005-10-19 19:07:19 jonas Exp $
#
# Generate certificates for mail (and other) servers
# Based on uw-imapd-ssl post-install script
#
# TODO: Add symlink from CA certificate to cacert.pem if non-existing

set -e

prg=$(basename $0)
copyright="(C) 2001-2005 Jonas Smedegaard <dr@jones.dk>"

# Set some defaults
PATH="$PATH:/usr/bin/ssl"
DAYS2EXPIRE="365"
SSLCERTDIR="/etc/ssl/certs"
SSLKEYDIR="/etc/ssl/private"
HOSTNAME="$(hostname -f)"
DOMAINNAME="$(hostname -d)"

CN="."
STATE="."
LOC="."
ORG="@@HOSTNAME@@"
OU="@@HOSTNAME@@"
FQDN="@@HOSTNAME@@"
ISSUER="postmaster@@@DOMAINNAME@@"

if [ -f /etc/local/mksslcerts.conf ]; then
    . /etc/local/mksslcerts.conf
fi

for var in CN STATE LOC ORG OU FQDN ISSUER; do
    eval $var=\"\$\(echo \"\$$var\" \| /bin/sed -e \"s/@@HOSTNAME@@/$HOSTNAME/g\" -e \"s/@@DOMAINNAME@@/$DOMAINNAME/g\"\)\";
done

mkcerthash() {
    base="$1"
    certfile="$base.pem"
    certhash="$(openssl x509 -noout -hash -in "$SSLCERTDIR/$certfile")"
    ln -sf "$certfile" "$SSLCERTDIR/$certhash.0"
}

mkselfcert() {
    base="$1"
    domain="$2"
    keypath="$SSLKEYDIR/$base.pem"
    certpath="$SSLCERTDIR/$base.pem"
    openssl req -new -x509 -nodes \
        -days "$DAYS2EXPIRE" \
        -keyout "$keypath" \
        -out "$certpath" > /dev/null 2>&1 <<+
$cn
$state
$loc
$org
$ou
$domain
$issuer
+
    chown root:root "$keypath" "$certpath"
    chmod 0600 "$keypath"
    chmod 0644 "$certpath"
    mkcerthash "$base"
}

mkkey() {
    filebase="$1"
    keypath="$SSLKEYDIR/$filebase.pem"
    openssl genrsa \
        -out "$keypath" > /dev/null 2>&1
    chown root:root "$keypath"
    chmod 0600 "$keypath"
}

mkcertreq() {
    base="$1"
    domain="$2"
    keypath="$SSLKEYDIR/$base.pem"
    reqpath="$SSLCERTDIR/$base.csr"
    openssl req -new \
        -key "$keypath" \
        -out "$reqpath" > /dev/null 2>&1 <<+
$cn
$state
$loc
$org
$ou
$domain
$issuer
.
.
+
    chown root:root "$reqpath"
    chmod 0640 "$reqpath"
}

mkselfcacert() {
    base="$1"
    domain="$2"
    cacert="$3"
    certpath="$SSLCERTDIR/$base.pem"
    reqpath="$SSLCERTDIR/$base.csr"
    cakeypath="$SSLKEYDIR/$cacert.pem"
    cacertpath="$SSLCERTDIR/$cacert.pem"
    openssl x509 -req \
        -days $DAYS2EXPIRE \
        -CA "$cacertpath" \
        -CAkey "$cakeyfile" \
        -CAcreateserial \
        -in "$reqpath" \
        -out "$certpath"
    chown root:root "$certpath"
    chmod 0644 "$certpath"
    mkcerthash "$base"
}

mkcacert() {
    base="$1"
    cakeypath="$SSLKEYDIR/$base.pem"
    cacertpath="$SSLCERTDIR/$base.pem"
#FIXME: Make strength configurable
    openssl genrsa -des3 \
        -out "$cakeypath" 1024
    chown root:root "$cakeypath"
    chmod 0400 "$cakeypath"
    # Generate and pre-fill certification request
#FIXME: Make validity configurable
    openssl req -new \
        -key "$cakeypath" \
        -x509 -days 1095 \
        -out "$cacertpath"
    # Add hash to certified public certificate and cleanup
    chown root:root "$cacertpath"
    chmod 0640 "$cacertpath"
    mkcerthash "$base"
}

usage() {
cat <<EOF
$prg, $copyright

Usage: $prg [--type selfcert|ca|selfca] [...] --daemon <daemon> [...] [--force]
   or: $prg <daemon> [<daemon>...] [-f]

General options:
      --type <CERT_TYPE>    Type of certificate
                              selfcert  Self-certified certificate
                  ca        Use Certificate Authority
                  selfca    Homemade Certificate Authority
                  Default: try guess based on other options
      --daemon <daemon>     Daemon(s) in need for a certificate
                              Default: none (or create only CA cert)
                              (selfcert certs are unique per daemon)
                  (ca and selfca are shared per hostname)
  -f, --force               Force overwriting existing certificate(s)
  -h, --help                This help text

General certificate options:
      --fqdn <FQDN>         Fully Qualified Domain Name
                              Default: $FQDN
      --cn <country>        Country Name (2 letter code)
                              Default: $CN
      --state <state>       State or Province Name (full name)
                              Default: $STATE
      --loc <locality>      Locality Name (eg, city)
                              Default: $LOC
      --org <organisation>  Organisation/company
                              Default: $ORG
      --ou <department>     Organisational unit/department
                              Default: $OU
      --issuer <issuer>     Email address of entity issuing certificate
                              Default: $ISSUER

Selfcert options:
      --cacert <file>       Certificate Authority to use/create
                              Default: \"cacert\" (possibly symlinked)
      --makeca              Create CA certificate if missing

Examples:

    Create certs for UW imapd/popd, guessing hostname and certificate type:
    $prg imapd pop3d

    Create host cert for non-default hostname and bind to UW daemons:
    $prg --type selfca --fqdn mail.$DOMAINNAME imapd pop3d

    Create local CA, signed host cert for $HOSTNAME and links to UW daemons:
    $prg --type selfca --cacert My-own_CA --makeca imapd pop3d

    Create certificate request to pass to Certificate Authority
    $prg --type ca --fqdn mail.$DOMAINNAME

    Finish install of CA-certified host certificate
    $prg --type ca --fqdn mail.$DOMAINNAME imapd pop3d
EOF
exit 1
}

certtype=''
fqdn=''
cn=''
state=''
loc=''
org=''
ou=''
daemon=''
daemons=''
issuer=''
cacert=''
makeca=''
force=''

TEMP=`getopt -o fh --long type:,daemon:,force,help,fqdn:,cn:,state:,loc:,org:,ou:,issuer:,cacert:,makeca -n "$prg" -- "$@"`

# Check for non-GNU getopt
if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

eval set -- "$TEMP"

# TODO: Redesign to a case of selfcert, selfca or ca

while true ; do
    case "$1" in
        --type)     case "$2" in
                    selfcert|ca|selfca) certtype="$2"; shift 2;;
                    *) echo "ERROR: Wrong certificate type: \"$2\"!" >&2; usage;;
                esac;;
        --daemon)   daemons="$daemons$2 "; shift 2;;
        --force|-f) force=1; shift;;
        --help|-h)  usage;;
        --fqdn)     fqdn="$2"; shift 2;;
        --cn)       cn="$2"; shift 2;;
        --state)    state="$2"; shift 2;;
        --loc)      loc="$2"; shift 2;;
        --org)      org="$2"; shift 2;;
        --ou)       ou="$2"; shift 2;;
        --issuer)   issuer="$2"; shift 2;;
        --cacert)   cacert="$2"; shift 2;;
        --makeca)   makeca=1; shift;;
        --)     shift; break;;
        *)      echo "Internal error!" >&2 ; exit 1 ;;
    esac
done

# Non-opt arguments are daemons
daemons="$daemons $@"

# Try to pick a sane certificate type if not explicitly set
if [ -z "$certtype" ] && [ -n "$makeca" ]; then
    certtype="selfca"
fi
if [ -z "$certtype" ] && [ -n "$cacert" ] && [ -r "$SSLKEYDIR/$cacert.pem" ]; then
    certtype="selfca"
fi
if [ -z "$certtype" ]; then
    echo "ERROR: Cannot guess certificate type!" >&2
    echo "  Please explicitly set --type (or more other options)." >&2
    exit 1
fi

# Use defaults for empty vars, and export
cn="${cn:-$CN}"
state="${state:-$STATE}"
loc="${loc:-$LOC}"
org="${org:-$ORG}"
ou="${ou:-$OU}"
fqdn="${fqdn:-$FQDN}"
issuer="${issuer:-$ISSUER}"

# 
case "$certtype" in
    selfcert)
        ;;
    ca)
        if [ ! -f "$SSLCERTDIR/$fqdn.pem" ] || [ -n "$force" ]; then
            echo "Generating host key for \"$fqdn\"..."
            mkkey "$fqdn"
            echo "Generating certificate request for \"$fqdn\"..."
            mkcertreq "$fqdn" "$fqdn"
            echo "Certificate request generated: $SSLCERTDIR/$fqdn.csr!"
            echo
            echo "Now pass this request to you certificate authority, save their"
            echo "provided certificate as \"$SSLCERTDIR/$fqdn.pem\","
            echo "and run this script again with same options (except --force)."
            exit 0
        else
            echo "Hashing new certificate and cleanup..."
            mkcerthash "$fqdn"
            rm -f "$SSLCERTDIR/$fqdn.csr"
        fi
        ;;
    selfca)
        if [ -z "$cacert" ] || [ "$cacert" = "cacert" ]; then
            if ! cacert="$(basename "$(readlink "$SSLCERTDIR/cacert.pem")")"; then      #" mc syntax hilite bug workaround
                echo "ERROR: Cannot resolve default CA cert \"$SSLCERTDIR/cacert.pem\"" >&2
                exit 1
            fi
        fi
        if [ ! -s "$SSLCERTDIR/$fqdn.pem" ] || [ ! -s "$SSLKEYDIR/$fqdn.pem" ]; then
            if [ -n "$force" ]; then
                echo "WARNING: Host certificate missing - will be (re)created!" >&2
            else
                echo "Error: Host certificate is missing!" >&2
                echo "       Use \"--cacert\" to (re)create." >&2
                exit 1
            fi
        fi
        # Cleaning up - if allowed
        for file in "$SSLKEYDIR/$fqdn.pem" "$SSLCERTDIR/$fqdn.csr" "$SSLCERTDIR/$fqdn.pem"; do
            if [ -n "$force" ] && [ -e "$file" ]; then
                rm -f "$file"
            else
                echo "ERROR: File \"$file\" already exists!" >&2
                echo "       Use \"--force\" to override." >&2
                exit 1
            fi
        done
        if [ ! -s "$SSLCERTDIR/$cacert.pem" ] || [ ! -s "$SSLKEYDIR/$cacert.pem" ]; then
            if [ -z "$makeca"]; then
                echo "Error: CA certificate is missing!" >&2
                echo "       Use another \"--cacert\" or create with \"--makeca\"." >&2
                exit 1
            fi
            echo "Generating CAcert \"$cacert\"..."
            mkcacert "$cacert"
        fi
        echo "Generating host key for \"$fqdn\"..."
        mkkey "$fqdn"
        echo "Generating host certificate for \"$fqdn\"..."
        mkcertreq "$fqdn" "$fqdn"
        mkselfcacert "$fqdn" "$fqdn" "$cacert"
        rm "$SSLCERTDIR/$fqdn.csr"
        ;;
    *)
        echo "Internal error!" >&2
        exit 1
        ;;
esac

for daemon in $daemons; do
    if [ -f "$SSLCERTDIR/$daemon.pem" ]; then
        if [ -n "$force" ]; then
            echo "WARNING: Removing exisitng certificate \"/etc/ssl/certs/$daemon.pem\"." >&2
            rm -f "$SSLCERTDIR/$(openssl x509 -noout -hash < "$SSLCERTDIR/$daemon.pem").0"
            rm -f "$SSLCERTDIR/$daemon.pem"
        else
            echo "WARNING: Ignoring already existing certificate \"/etc/ssl/certs/$daemon.pem\"." >&2
            continue
        fi
    fi
    case "$certtype" in
        selfcert)
            echo -n "Generating self-certifying $daemon certificate..."
            mkselfcert "$daemon" "$fqdn"
            echo "Done!"
            ;;
        ca|selfca)
            echo "Attaching $daemon to certified certificate for $fqdn."
            ln -sf "$fqdn.pem" "$SSLCERTDIR/$daemon.pem"
            ln -sf "$fqdn.pem" "$SSLKEYDIR/$daemon.pem"
            ;;
        *)
            echo "Internal error!" >&2
            exit 1
            ;;
    esac
done