#

# Copyright (c) 2005-2009 Nokia Corporation and/or its subsidiary(-ies).

# All rights reserved.

# This component and the accompanying materials are made available

# under the terms of the License "Eclipse Public License v1.0"

# which accompanies this distribution, and is available

# at the URL "http://www.eclipse.org/legal/epl-v10.html".

#

# Initial Contributors:

# Nokia Corporation - initial contribution.

#

# Contributors:

#

# Description: 

# This script converts certificate constraint extensions specified in an INI 

# format into a hex representation of the DER encoding that OpenSSL can 

# add to a certificate.

use strict;

use Getopt::Long;

my $OID_DEVICE_ID_LIST="1.2.826.0.1.1796587.1.1.1.1";

my $OID_SID_LIST="1.2.826.0.1.1796587.1.1.1.4";

my $OID_VID_LIST="1.2.826.0.1.1796587.1.1.1.5";

my $OID_CAPABILITIES="1.2.826.0.1.1796587.1.1.1.6";

# Reserved for future use

#my $OID_SUBSCRIBER_ID_LIST="1.2.826.0.1.1796587.1.1.2.2"; 

#my $OID_ICC_ID_LIST="1.2.826.0.1.1796587.1.1.1.3";

my $DER_UTF8STRING_TAG="0C";

my $DER_PRINTABLESTRING_TAG="13";

my $DER_SEQUENCE_TAG="30";

my $DER_INTEGER_TAG="02";

my $DER_BITSTRING_TAG="03";

my $DER_OCTET_TAG="04";

my %CAPABILITY_SET = (

	"TCB" => 0,

	"COMMDD" => 1,

	"POWERMGMT" => 2,

	"MULTIMEDIADD" => 3,

	"READDEVICEDATA" => 4,

	"WRITEDEVICEDATA" => 5,

	"DRM" => 6,

	"TRUSTEDUI" => 7,

	"PROTSERV" => 8,

	"DISKADMIN" => 9,

	"NETWORKCONTROL" => 10,

	"ALLFILES" => 11,

	"SWEVENT" => 12,

	"NETWORKSERVICES" => 13,

	"LOCALSERVICES" => 14,

	"READUSERDATA" => 15,

	"WRITEUSERDATA" => 16,

	"LOCATION" => 17,

	"SURROUNDINGSDD" => 18,

	"USERENVIRONMENT" => 19	

	);

# Sections encountered

my %sections;

# Fields within sectins

my @device_id_list = ();

my @sid_list = ();

my @vid_list = ();

my $capabilities = '';

main();

exit(0);

# Main function.

# Loops through the input file and creates lists of items for each section.

sub main {

	my $section = "";

	my $output_binary = 0;

	GetOptions('binary' => \$output_binary);			   

	my ($infile, $outfile) = @ARGV;

	if (defined $infile) {

		open IN, "$infile" || die "Cannot open input file $infile";

	}

	else {

		*IN = *STDIN;

	}

	if (defined $outfile) {

		open OUT,  ">$outfile" || die "Cannot open input file $outfile";

	}

	else {

		*OUT = *STDOUT;

	}

	while (<IN>) {

		chomp;

		if (/^\s*\[\w*\]/) {

			# Process the new section name

			s/.*\[\s*(.*)\s*].*/$1/g;

			$section = lc($_);

    		$sections{$section} = 1;

	    }

	    elsif (/^\s*\#/) {

			# Comment - ignore

		}

	    elsif (/.*=.*/ ) {

			# Process element within section

			s/.*=//g;

			if ($section eq "device_id_list") {

				push @device_id_list, $_;

			}

            elsif ($section eq "sid_list") {

                push @sid_list, $_;

			}

			elsif ($section eq "vid_list") {

				push @vid_list, $_;

			}

			elsif ($section eq "cert_capabilities") {

				if (! $capabilities eq "") {

					die "Error: Multiple capability constraints defined.";

				}

				$capabilities = $_;

				if ($capabilities eq "" || $capabilities =~ /^\s*[01]+\s*$/)  {

					# Handle explicit bit strings

					$capabilities =~ s/\s//g;

				}

				else {

					# Convert MMP syntax into an explicit bit string

					$capabilities = &encode_capabilities($capabilities);					

				}

			}

			else {

				# Not in a section so ignore text

			}

		}   

   }   

   if ($output_binary) {

	   print_to_der();  

   }

   else {

       print_to_cnf();

   }

   close IN;

   close OUT;

}

# Test function which outputs the binary DER encoding. This can be vieweed using an

# ASN.1 viewer.

# This is really a debug function.

sub print_to_der {

	my $seq_octets = 0; 

	my $seq_content = "";

	if (defined $sections{"device_id_list"}) { 

		$seq_content .= ":" . &encode_string_list(\@device_id_list, \$seq_octets);

	}

	if (defined $sections{"sid_list"}) {

		$seq_content .= ":" . &encode_integer_list(\@sid_list, \$seq_octets);

	}

	if (defined $sections{"vid_list"}) {

		$seq_content .= ":" . &encode_integer_list(\@vid_list, \$seq_octets);

	}

	if (defined $sections{"cert_capabilities"}) {

		$seq_content .= ":" . &encode_bit_string($capabilities, \$seq_octets);

	}

	# Tidy up repreated colons

	$seq_content =~ s/::/:/;

	$seq_content =~ s/^://g;

	my $seq_length_octets;

	my $seq_length = &encode_length($seq_octets, \$seq_length_octets);

	my $seq ="$DER_SEQUENCE_TAG:$seq_length:$seq_content";

	$seq =~ s/::/:/g;

	$seq = uc($seq);

	binmode(OUT);

	foreach (split(/:/, $seq)){

		print OUT pack('C', hex);

	}

}

# Output to a format that can be read by Open SSL using the -extfile parameter

sub print_to_cnf {

   print OUT "extensions = extend\n";

   print OUT "[extend]\n";

   my $octets = 0; 

   my $output = "";

   if (defined $sections{"device_id_list"}) {

	   $output .= "# Device ID List\n" .

		   $OID_DEVICE_ID_LIST . "= critical, " . "DER:" . 

		   uc(&encode_string_list(\@device_id_list, \$octets)) . "\n";

   }      

   if (defined $sections{"sid_list"}) {

	   $output .= "# SID List\n" .

		   $OID_SID_LIST . "= critical, " . "DER:" . 

		   uc(&encode_integer_list(\@sid_list, \$octets)) . "\n";

   }   

   if (defined $sections{"vid_list"}) {

	   $output .= "# VID List\n" .

	   $OID_VID_LIST . "= critical, " . "DER:" . uc(&encode_integer_list(\@vid_list, \$octets)) . "\n";

   }   

   if (defined $sections{"cert_capabilities"}) {

	   $output .= "# Capabilities\n" .

		   $OID_CAPABILITIES . "= critical, " . "DER:" . uc(&encode_bit_string($capabilities, \$octets)) . "\n";

   }   

   # Remove trailing colons

   $output=~ s/\:*$//mg;

   print OUT $output;

}

# Creates a hex representation of the DER encoding of a sequence of strings.

sub encode_string_list($$) {

	my ($list, $octets) = @_;

	my $sequence_body = "";

	my $sequence_octets = 0;

	foreach (@$list) {

		my $hex_string = &encode_utf8_string($_, \$sequence_octets);

		# Add to string sequence body

		if ($sequence_body ne "") {

			$sequence_body .= ":";

		}

		$sequence_body .= $hex_string;

	}

	my $seq_length_octets = 0;

	my $seq_length = &encode_length($sequence_octets, \$seq_length_octets);

	$$octets += 1 + $seq_length_octets + $sequence_octets;

	return "$DER_SEQUENCE_TAG:$seq_length:$sequence_body";

}

# Creates a hex represenation of the DER encoding of a sequence of integers.

sub encode_integer_list($$) {

	my ($list, $octets) = @_;	

	my $sequence_body = "";

	my $sequence_octets = 0;

	foreach (@$list) {

		# Increment for integer tag value

		# Increment for integer length < 127 octets assumed !

		$sequence_octets+=2;

		if (s/^0x//) {

			$_ = hex;

		}

		# Convert the integer to base 256 hex and find out how

		# many octets were required

		my $hex_octets;

		my $hex_integer;

		if (//) {

			$hex_octets = 0;

			$hex_integer = "";

		}

		else {

			$hex_integer = &to_hex_base256($_, \$hex_octets);

			$sequence_octets += $hex_octets;

		}

		# Add to integer  sequence body

		if ($sequence_body ne "") {

			$sequence_body .= ":";

		}

		# No need to store length in long form because in base256

		# we never need more than 7 octets to store the largest number

		# that we need.

		my $int_header = sprintf("%2.2x", $hex_octets);

		$sequence_body .= "$DER_INTEGER_TAG:$int_header:$hex_integer";		

	}

	# Get the number of octets of the entire sequence. This could require

	# encoding in long form.

	my $seq_length_octets = 0;

	my $seq_length = &encode_length($sequence_octets, \$seq_length_octets);

	$$octets += 1 + $seq_length_octets + $sequence_octets;

	return "$DER_SEQUENCE_TAG:$seq_length:$sequence_body";

}

# Creates a hex represenation of the DER encoding of a UTF-8 string.

sub encode_utf8_string($$) {

	my ($input, $octets) = @_;

	# Hex encoded string

	my $output = "";

	my $input_len = length($input);	

	my $i = 0;

	while ($i < $input_len) {

		my $hex_val = ord(substr($input, $i, 1));

		if ($output ne "") {

			$output .= ":";

		}

		$output .= sprintf("%2.2x", $hex_val);

		$i++;

	}

	# Build string header

	my $output_length_octets = 0;		

	my $output_length = &encode_length($input_len, \$output_length_octets);

	# Track number of octets added for string header

	$$octets += 1 + $output_length_octets + $input_len;

	return "$DER_UTF8STRING_TAG:$output_length:$output";

}

# Converts the text description of capabilities into an ASCII string of 0s and 1s;

sub encode_capabilities($) {

	my ($value) = @_;

	my $output = "";

	my @caps = (0);

	$value = uc($value);

	foreach (split(/[\s,]/, $value)) {

		my $set_val = 1;

		if (s/^-//g) {

			$set_val = 0;

		}

		if (/^ALL$/) {

			foreach (keys %CAPABILITY_SET) {

				@caps[$CAPABILITY_SET{$_}] = 1;

			}

		}

	    elsif (/^NONE$/) {

			@caps = ();

		}

		if (defined $CAPABILITY_SET{$_}) {

			$caps[$CAPABILITY_SET{$_}] = $set_val;

		}

	}

	# Build the ascii bit string. Bit 0 is the left most bit

	for (my $i = 0; $i <= $#caps; $i++) {

		$output .= (defined $caps[$i] && $caps[$i] ? "1" : "0");

	}

	return $output;

}

# Creates a hex representation of the DER encoding of an arbitrary length bit string

sub encode_bit_string($$) {

	my ($text, $octets) = @_;

	# Bit string in hex including padding length octet

	my $bit_str = "";

	my $bit_str_octets = 1; # one octet for padding

	# Current byte

	my $byte = 0;	

	my $len = length($text);

	if ($len == 0) {

		$$octets+=2;

		return "03:00";

	}

	my $i = 0;

	while ($i < $len) {		

		# Read the ith character and insert it in the correct place in the byte

		# (fill from the left)

		my $c = substr($text, $i, 1);		

		if ($c eq "1") {

			$byte |= (1 << (7 - ($i % 8)));

		}

		elsif ($c ne "0") {

			die "Invalid character $c in bit string $text";

		}

		if (++$i % 8 == 0) {

			# Received 8 bits so output byte in hex

			if ($bit_str ne "") {

				$bit_str .= ":";

			}

			$bit_str .= sprintf("%2.2x", $byte);

			$bit_str_octets++;

			$byte = 0;

		}

	}

	# Pad any remaining bits / make sure 0 is output for empty string

	if ($byte != 0 || $bit_str_octets == 1) {

		if ($bit_str ne "") {

			$bit_str .= ":";

		}

		$bit_str .= sprintf("%2.2x", $byte);

		$bit_str_octets++;

	}

	my $pad_length = "00";

	if ($len % 8 > 0) {

		# If this isn't a multiple of 8 bits then calculated

		# the number of padding bits added.

		$pad_length = sprintf("%2.2x", 8 - ($len % 8));

	}

	# Octets used to store the length

	my $bit_str_length_octets = 0;

	my $bit_str_length = &encode_length($bit_str_octets, \$bit_str_length_octets);

	$$octets += 1 + $bit_str_length_octets + $bit_str_octets;

	return "$DER_BITSTRING_TAG:$bit_str_length:$pad_length:$bit_str";

}

# Return a hex represenation of the length using DER primitive (definate length encoding)

sub encode_length($$) {

	my ($num, $octets) = @_;

	if ($num < 128) {

		# Number is < 128 so encode in short form

		$$octets++;

		return sprintf("%2.2x", $num);

	}

	else {

		# Number >= 128 so encode in long form

		my $length_octets = 0;

		my $base256 = &to_hex_base256($num, \$length_octets);

		if ($length_octets > 127) {die "Encoding overflow.";}

		$$octets += 1 + $length_octets;

		# Set the top bit of the length octet to indicate long form		

		return "" . sprintf("%2.2x", ($length_octets | 0x80)) . ":$base256";

	}

}

# Convert an integer into an ascii hex representation in base 256

# $num    - the number to encode

# $octets - refernce to the octet count to increment

sub to_hex_base256($$) {

	my ($num, $octets) = @_;

	my $base256 = "";

	$num = int($num);

	while ($num > 0) {

		my $hexoctet = sprintf("%2.2x", $num & 0xFF);

		if ($base256 ne "") {

			$base256 = "$hexoctet:$base256";

		}

		else {

			$base256 = $hexoctet;

		}		

		$num >>= 8;

		$$octets++;

	}

	if ($base256 eq "") {

		$base256 = "0";

		$$octets++;

	}

	return $base256;

}