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|
#! /bin/sh
# show key for this host, in DNS (or other) format
# Copyright (C) 2000, 2001 Henry Spencer.
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2 of the License, or (at your
# option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
#
# 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.
#
# RCSID $Id: showhostkey.in,v 1.1 2004/03/15 20:35:31 as Exp $
me="ipsec showhostkey"
usage="Usage: $me [--file secrets] [--left] [--right] [--txt gateway] [--id id]
[--dhclient]"
file=/etc/ipsec.secrets
fmt=""
gw=
id=
for dummy
do
case "$1" in
--key) fmt="dns" ;;
--file) file="$2" ; shift ;;
--left) fmt="left" ;;
--right) fmt="right" ;;
--dhclient) fmt="dhclient" ;;
--txt) fmt="txt" ; gw="$2" ; shift ;;
--wavesec) fmt="wavesec" ;;
--id) id="$2" ; shift ;;
--version) echo "$me $IPSEC_VERSION" ; exit 0 ;;
--help) echo "$usage" ; exit 0 ;;
--) shift ; break ;;
-*) echo "$me: unknown option \`$1'" >&2 ; exit 2 ;;
*) break ;;
esac
shift
done
if test " $fmt" = " "
then
echo "$me: must specify a format for the result" >&2
exit 2
fi
if test " $fmt" = " txt" -a " $gw" = " "
then
echo "$me: --txt gateway value cannot be empty" >&2
exit 2
fi
if test ! -f $file
then
echo "$me: file \`$file' does not exist" >&2
exit 1
elif test ! -r $file
then
echo "$me: permission denied (cannot read \`$file')" >&2
exit 1
fi
host="`hostname --fqdn`"
awk ' BEGIN {
inkey = 0
seenkey = 0
nfound = 0
err = "cat >&2"
me = "'"$me"'"
host = "'"$host"'"
file = "'"$file"'"
fmt = "'"$fmt"'"
gw = "'"$gw"'"
id = "'"$id"'"
comment = ""
s = "[ \t]+"
os = "[ \t]*"
x = "[^ \t]+"
oc = "(#.*)?"
suffix = ":" os "[rR][sS][aA]" os "{" os oc "$"
if (id == "") {
pat = "^" suffix
printid = "default"
} else {
pat = "^(" x s ")*" id "(" s x ")*" os suffix
printid = quote(id)
}
paydirt = "^[ \t]+#pubkey=0s"
status = 0
}
$0 ~ pat {
inkey = 1
seenkey = 1
}
/^[ \t]+}$/ {
inkey = 0
}
inkey && $0 ~ /^[ \t]+# RSA [0-9]+ bits/ {
comment = $0
if (fmt == "dns" || fmt == "txt" || fmt == "dhclient")
sub(/^[ \t]+#/, "#", comment)
host = $5
}
inkey && $0 ~ /^[ \t]+#pubkey=0s/ {
}
inkey && fmt == "dns" && $0 ~ paydirt {
out = $0
sub(paydirt, (host ".\tIN\tKEY\t0x4200 4 1 "), out)
nfound++
}
inkey && fmt == "dhclient" && $0 ~ paydirt {
# NOT YET ADJUSTED TO KEY RR elimination
boilerplate = "option oe-key code 159 = string;\n" \
"option oe-gateway code 160 = ip-address;\n" \
"send oe-key = "
out = $0
sub(paydirt, "0x4200 4 1 ", out)
out = "option oe-key code 159 = string;\n" \
"option oe-gateway code 160 = ip-address;\n" \
"send oe-key = " quote(out) ";"
nfound++
}
inkey && fmt == "txt" && $0 ~ paydirt {
if (gw !~ /^@/ && gw !~ /^[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*\.[0-9][0-9]*$/ )
{
grump("gateway must be @FQDN or IPv4 address, not " quote(gw))
exit(status)
}
out = $0
gsub(/[ \t]+/, " ", out)
sub(paydirt, "", out)
out = " " out
str = "X-IPsec-Server(10)=" gw
if (length(str) < 255 && length(str) + length(out) > 255) {
str = " " quote(str)
} else {
out = str out
str = ""
}
while (length(out) > 255) {
str = str " " quote(substr(out, 1, 255))
out = substr(out, 256)
}
if (length(out) > 0)
str = str " " quote(out)
out = "\tIN\tTXT\t" substr(str, 2)
nfound++
}
inkey && (fmt == "left" || fmt == "right") && $0 ~ /^[ \t]+#pubkey=/ {
out = $0
sub(/^[ \t]+#pubkey=/, ("\t" fmt "rsasigkey="), out)
nfound++
}
function quote(s) {
return "\"" s "\""
}
function grump(s) {
print me ": " s |err
status = 1
}
END {
if (status != 0)
exit(status)
if (!seenkey)
grump("no " printid " key in " quote(file))
else if (nfound == 0) {
grump("no pubkey line found -- key information old?")
} else if (nfound > 1)
grump("multiple " printid " keys found!?!")
else {
if (comment != "")
print comment
print out
}
exit(status)
}' $file
|
