scripts/x509keyid - kernel/msm-5.4 - Gitiles

 #!/usr/bin/perl -w
 #
 # Generate an identifier from an X.509 certificate that can be placed in a
 # module signature to indentify the key to use.
 #
 # Format:
 #
 #	./scripts/x509keyid <x509-cert> <signer's-name> <key-id>
 #
 # We read the DER-encoded X509 certificate and parse it to extract the Subject
 # name and Subject Key Identifier.  The provide the data we need to build the
 # certificate identifier.
 #
 # The signer's name part of the identifier is fabricated from the commonName,
 # the organizationName or the emailAddress components of the X.509 subject
 # name and written to the second named file.
 #
 # The subject key ID to select which of that signer's certificates we're
 # intending to use to sign the module is written to the third named file.
 #
 use strict;

 my $raw_data;

 die "Need three filenames\n" if ($#ARGV != 2);

 my $src = $ARGV[0];

 open(FD, "<$src") || die $src;
 binmode FD;
 my @st = stat(FD);
 die $src if (!@st);
 read(FD, $raw_data, $st[7]) || die $src;
 close(FD);

 my $UNIV = 0 << 6;
 my $APPL = 1 << 6;
 my $CONT = 2 << 6;
 my $PRIV = 3 << 6;

 my $CONS = 0x20;

 my $BOOLEAN	= 0x01;
 my $INTEGER	= 0x02;
 my $BIT_STRING	= 0x03;
 my $OCTET_STRING = 0x04;
 my $NULL	= 0x05;
 my $OBJ_ID	= 0x06;
 my $UTF8String	= 0x0c;
 my $SEQUENCE	= 0x10;
 my $SET		= 0x11;
 my $UTCTime	= 0x17;
 my $GeneralizedTime = 0x18;

 my %OIDs = (
     pack("CCC", 85, 4, 3)	=> "commonName",
     pack("CCC", 85, 4, 6)	=> "countryName",
     pack("CCC", 85, 4, 10)	=> "organizationName",
     pack("CCC", 85, 4, 11)	=> "organizationUnitName",
     pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 1) => "rsaEncryption",
     pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 5) => "sha1WithRSAEncryption",
     pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 9, 1) => "emailAddress",
     pack("CCC", 85, 29, 35)	=> "authorityKeyIdentifier",
     pack("CCC", 85, 29, 14)	=> "subjectKeyIdentifier",
     pack("CCC", 85, 29, 19)	=> "basicConstraints"
 );

 ###############################################################################
 #
 # Extract an ASN.1 element from a string and return information about it.
 #
 ###############################################################################
 sub asn1_extract($$@)
 {
     my ($cursor, $expected_tag, $optional) = @_;

     return [ -1 ]
 	if ($cursor->[1] == 0 && $optional);

     die $src, ": ", $cursor->[0], ": ASN.1 data underrun (elem ", $cursor->[1], ")\n"
 	if ($cursor->[1] < 2);

     my ($tag, $len) = unpack("CC", substr(${$cursor->[2]}, $cursor->[0], 2));

     if ($expected_tag != -1 && $tag != $expected_tag) {
 	return [ -1 ]
 	    if ($optional);
 	die $src, ": ", $cursor->[0], ": ASN.1 unexpected tag (", $tag,
 	" not ", $expected_tag, ")\n";
     }

     $cursor->[0] += 2;
     $cursor->[1] -= 2;

     die $src, ": ", $cursor->[0], ": ASN.1 long tag\n"
 	if (($tag & 0x1f) == 0x1f);
     die $src, ": ", $cursor->[0], ": ASN.1 indefinite length\n"
 	if ($len == 0x80);

     if ($len > 0x80) {
 	my $l = $len - 0x80;
 	die $src, ": ", $cursor->[0], ": ASN.1 data underrun (len len $l)\n"
 	    if ($cursor->[1] < $l);

 	if ($l == 0x1) {
 	    $len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1));
 	} elsif ($l = 0x2) {
 	    $len = unpack("n", substr(${$cursor->[2]}, $cursor->[0], 2));
 	} elsif ($l = 0x3) {
 	    $len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1)) << 16;
 	    $len = unpack("n", substr(${$cursor->[2]}, $cursor->[0] + 1, 2));
 	} elsif ($l = 0x4) {
 	    $len = unpack("N", substr(${$cursor->[2]}, $cursor->[0], 4));
 	} else {
 	    die $src, ": ", $cursor->[0], ": ASN.1 element too long (", $l, ")\n";
 	}

 	$cursor->[0] += $l;
 	$cursor->[1] -= $l;
     }

     die $src, ": ", $cursor->[0], ": ASN.1 data underrun (", $len, ")\n"
 	if ($cursor->[1] < $len);

     my $ret = [ $tag, [ $cursor->[0], $len, $cursor->[2] ] ];
     $cursor->[0] += $len;
     $cursor->[1] -= $len;

     return $ret;
 }

 ###############################################################################
 #
 # Retrieve the data referred to by a cursor
 #
 ###############################################################################
 sub asn1_retrieve($)
 {
     my ($cursor) = @_;
     my ($offset, $len, $data) = @$cursor;
     return substr($$data, $offset, $len);
 }

 ###############################################################################
 #
 # Roughly parse the X.509 certificate
 #
 ###############################################################################
 my $cursor = [ 0, length($raw_data), \$raw_data ];

 my $cert = asn1_extract($cursor, $UNIV | $CONS | $SEQUENCE);
 my $tbs = asn1_extract($cert->[1], $UNIV | $CONS | $SEQUENCE);
 my $version = asn1_extract($tbs->[1], $CONT | $CONS | 0, 1);
 my $serial_number = asn1_extract($tbs->[1], $UNIV | $INTEGER);
 my $sig_type = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
 my $issuer = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
 my $validity = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
 my $subject = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
 my $key = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE);
 my $issuer_uid = asn1_extract($tbs->[1], $CONT | $CONS | 1, 1);
 my $subject_uid = asn1_extract($tbs->[1], $CONT | $CONS | 2, 1);
 my $extension_list = asn1_extract($tbs->[1], $CONT | $CONS | 3, 1);

 my $subject_key_id = ();
 my $authority_key_id = ();

 #
 # Parse the extension list
 #
 if ($extension_list->[0] != -1) {
     my $extensions = asn1_extract($extension_list->[1], $UNIV | $CONS | $SEQUENCE);

     while ($extensions->[1]->[1] > 0) {
 	my $ext = asn1_extract($extensions->[1], $UNIV | $CONS | $SEQUENCE);
 	my $x_oid = asn1_extract($ext->[1], $UNIV | $OBJ_ID);
 	my $x_crit = asn1_extract($ext->[1], $UNIV | $BOOLEAN, 1);
 	my $x_val = asn1_extract($ext->[1], $UNIV | $OCTET_STRING);

 	my $raw_oid = asn1_retrieve($x_oid->[1]);
 	next if (!exists($OIDs{$raw_oid}));
 	my $x_type = $OIDs{$raw_oid};

 	my $raw_value = asn1_retrieve($x_val->[1]);

 	if ($x_type eq "subjectKeyIdentifier") {
 	    my $vcursor = [ 0, length($raw_value), \$raw_value ];

 	    $subject_key_id = asn1_extract($vcursor, $UNIV | $OCTET_STRING);
 	}
     }
 }

 ###############################################################################
 #
 # Determine what we're going to use as the signer's name.  In order of
 # preference, take one of: commonName, organizationName or emailAddress.
 #
 ###############################################################################
 my $org = "";
 my $cn = "";
 my $email = "";

 while ($subject->[1]->[1] > 0) {
     my $rdn = asn1_extract($subject->[1], $UNIV | $CONS | $SET);
     my $attr = asn1_extract($rdn->[1], $UNIV | $CONS | $SEQUENCE);
     my $n_oid = asn1_extract($attr->[1], $UNIV | $OBJ_ID);
     my $n_val = asn1_extract($attr->[1], -1);

     my $raw_oid = asn1_retrieve($n_oid->[1]);
     next if (!exists($OIDs{$raw_oid}));
     my $n_type = $OIDs{$raw_oid};

     my $raw_value = asn1_retrieve($n_val->[1]);

     if ($n_type eq "organizationName") {
 	$org = $raw_value;
     } elsif ($n_type eq "commonName") {
 	$cn = $raw_value;
     } elsif ($n_type eq "emailAddress") {
 	$email = $raw_value;
     }
 }

 my $id_name = $email;

 if ($org && $cn) {
     # Don't use the organizationName if the commonName repeats it
     if (length($org) <= length($cn) &&
 	substr($cn, 0, length($org)) eq $org) {
 	$id_name = $cn;
 	goto got_id_name;
     }

     # Or a signifcant chunk of it
     if (length($org) >= 7 &&
 	length($cn) >= 7 &&
 	substr($cn, 0, 7) eq substr($org, 0, 7)) {
 	$id_name = $cn;
 	goto got_id_name;
     }

     $id_name = $org . ": " . $cn;
 } elsif ($org) {
     $id_name = $org;
 } elsif ($cn) {
     $id_name = $cn;
 }

 got_id_name:

 ###############################################################################
 #
 # Output the signer's name and the key identifier that we're going to include
 # in module signatures.
 #
 ###############################################################################
 die $src, ": ", "X.509: Couldn't find the Subject Key Identifier extension\n"
     if (!$subject_key_id);

 my $id_key_id = asn1_retrieve($subject_key_id->[1]);

 open(OUTFD, ">$ARGV[1]") || die $ARGV[1];
 print OUTFD $id_name;
 close OUTFD || die $ARGV[1];

 open(OUTFD, ">$ARGV[2]") || die $ARGV[2];
 print OUTFD $id_key_id;
 close OUTFD || die $ARGV[2];
	#!/usr/bin/perl -w
	#
	# Generate an identifier from an X.509 certificate that can be placed in a
	# module signature to indentify the key to use.
	#
	# Format:
	#
	# ./scripts/x509keyid <x509-cert> <signer's-name> <key-id>
	#
	# We read the DER-encoded X509 certificate and parse it to extract the Subject
	# name and Subject Key Identifier. The provide the data we need to build the
	# certificate identifier.
	#
	# The signer's name part of the identifier is fabricated from the commonName,
	# the organizationName or the emailAddress components of the X.509 subject
	# name and written to the second named file.
	#
	# The subject key ID to select which of that signer's certificates we're
	# intending to use to sign the module is written to the third named file.
	#
	use strict;

	my $raw_data;

	die "Need three filenames\n" if ($#ARGV != 2);

	my $src = $ARGV[0];

	open(FD, "<$src") \|\| die $src;
	binmode FD;
	my @st = stat(FD);
	die $src if (!@st);
	read(FD, $raw_data, $st[7]) \|\| die $src;
	close(FD);

	my $UNIV = 0 << 6;
	my $APPL = 1 << 6;
	my $CONT = 2 << 6;
	my $PRIV = 3 << 6;

	my $CONS = 0x20;

	my $BOOLEAN = 0x01;
	my $INTEGER = 0x02;
	my $BIT_STRING = 0x03;
	my $OCTET_STRING = 0x04;
	my $NULL = 0x05;
	my $OBJ_ID = 0x06;
	my $UTF8String = 0x0c;
	my $SEQUENCE = 0x10;
	my $SET = 0x11;
	my $UTCTime = 0x17;
	my $GeneralizedTime = 0x18;

	my %OIDs = (
	pack("CCC", 85, 4, 3) => "commonName",
	pack("CCC", 85, 4, 6) => "countryName",
	pack("CCC", 85, 4, 10) => "organizationName",
	pack("CCC", 85, 4, 11) => "organizationUnitName",
	pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 1) => "rsaEncryption",
	pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 5) => "sha1WithRSAEncryption",
	pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 9, 1) => "emailAddress",
	pack("CCC", 85, 29, 35) => "authorityKeyIdentifier",
	pack("CCC", 85, 29, 14) => "subjectKeyIdentifier",
	pack("CCC", 85, 29, 19) => "basicConstraints"
	);

	###############################################################################
	#
	# Extract an ASN.1 element from a string and return information about it.
	#
	###############################################################################
	sub asn1_extract($$@)
	{
	my ($cursor, $expected_tag, $optional) = @_;

	return [ -1 ]
	if ($cursor->[1] == 0 && $optional);

	die $src, ": ", $cursor->[0], ": ASN.1 data underrun (elem ", $cursor->[1], ")\n"
	if ($cursor->[1] < 2);

	my ($tag, $len) = unpack("CC", substr(${$cursor->[2]}, $cursor->[0], 2));

	if ($expected_tag != -1 && $tag != $expected_tag) {
	return [ -1 ]
	if ($optional);
	die $src, ": ", $cursor->[0], ": ASN.1 unexpected tag (", $tag,
	" not ", $expected_tag, ")\n";
	}

	$cursor->[0] += 2;
	$cursor->[1] -= 2;

	die $src, ": ", $cursor->[0], ": ASN.1 long tag\n"
	if (($tag & 0x1f) == 0x1f);
	die $src, ": ", $cursor->[0], ": ASN.1 indefinite length\n"
	if ($len == 0x80);

	if ($len > 0x80) {
	my $l = $len - 0x80;
	die $src, ": ", $cursor->[0], ": ASN.1 data underrun (len len $l)\n"
	if ($cursor->[1] < $l);

	if ($l == 0x1) {
	$len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1));
	} elsif ($l = 0x2) {
	$len = unpack("n", substr(${$cursor->[2]}, $cursor->[0], 2));
	} elsif ($l = 0x3) {
	$len = unpack("C", substr(${$cursor->[2]}, $cursor->[0], 1)) << 16;
	$len = unpack("n", substr(${$cursor->[2]}, $cursor->[0] + 1, 2));
	} elsif ($l = 0x4) {
	$len = unpack("N", substr(${$cursor->[2]}, $cursor->[0], 4));
	} else {
	die $src, ": ", $cursor->[0], ": ASN.1 element too long (", $l, ")\n";
	}

	$cursor->[0] += $l;
	$cursor->[1] -= $l;
	}

	die $src, ": ", $cursor->[0], ": ASN.1 data underrun (", $len, ")\n"
	if ($cursor->[1] < $len);

	my $ret = [ $tag, [ $cursor->[0], $len, $cursor->[2] ] ];
	$cursor->[0] += $len;
	$cursor->[1] -= $len;

	return $ret;
	}

	###############################################################################
	#
	# Retrieve the data referred to by a cursor
	#
	###############################################################################
	sub asn1_retrieve($)
	{
	my ($cursor) = @_;
	my ($offset, $len, $data) = @$cursor;
	return substr($$data, $offset, $len);
	}

	###############################################################################
	#
	# Roughly parse the X.509 certificate
	#
	###############################################################################
	my $cursor = [ 0, length($raw_data), \$raw_data ];

	my $cert = asn1_extract($cursor, $UNIV \| $CONS \| $SEQUENCE);
	my $tbs = asn1_extract($cert->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $version = asn1_extract($tbs->[1], $CONT \| $CONS \| 0, 1);
	my $serial_number = asn1_extract($tbs->[1], $UNIV \| $INTEGER);
	my $sig_type = asn1_extract($tbs->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $issuer = asn1_extract($tbs->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $validity = asn1_extract($tbs->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $subject = asn1_extract($tbs->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $key = asn1_extract($tbs->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $issuer_uid = asn1_extract($tbs->[1], $CONT \| $CONS \| 1, 1);
	my $subject_uid = asn1_extract($tbs->[1], $CONT \| $CONS \| 2, 1);
	my $extension_list = asn1_extract($tbs->[1], $CONT \| $CONS \| 3, 1);

	my $subject_key_id = ();
	my $authority_key_id = ();

	#
	# Parse the extension list
	#
	if ($extension_list->[0] != -1) {
	my $extensions = asn1_extract($extension_list->[1], $UNIV \| $CONS \| $SEQUENCE);

	while ($extensions->[1]->[1] > 0) {
	my $ext = asn1_extract($extensions->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $x_oid = asn1_extract($ext->[1], $UNIV \| $OBJ_ID);
	my $x_crit = asn1_extract($ext->[1], $UNIV \| $BOOLEAN, 1);
	my $x_val = asn1_extract($ext->[1], $UNIV \| $OCTET_STRING);

	my $raw_oid = asn1_retrieve($x_oid->[1]);
	next if (!exists($OIDs{$raw_oid}));
	my $x_type = $OIDs{$raw_oid};

	my $raw_value = asn1_retrieve($x_val->[1]);

	if ($x_type eq "subjectKeyIdentifier") {
	my $vcursor = [ 0, length($raw_value), \$raw_value ];

	$subject_key_id = asn1_extract($vcursor, $UNIV \| $OCTET_STRING);
	}
	}
	}

	###############################################################################
	#
	# Determine what we're going to use as the signer's name. In order of
	# preference, take one of: commonName, organizationName or emailAddress.
	#
	###############################################################################
	my $org = "";
	my $cn = "";
	my $email = "";

	while ($subject->[1]->[1] > 0) {
	my $rdn = asn1_extract($subject->[1], $UNIV \| $CONS \| $SET);
	my $attr = asn1_extract($rdn->[1], $UNIV \| $CONS \| $SEQUENCE);
	my $n_oid = asn1_extract($attr->[1], $UNIV \| $OBJ_ID);
	my $n_val = asn1_extract($attr->[1], -1);

	my $raw_oid = asn1_retrieve($n_oid->[1]);
	next if (!exists($OIDs{$raw_oid}));
	my $n_type = $OIDs{$raw_oid};

	my $raw_value = asn1_retrieve($n_val->[1]);

	if ($n_type eq "organizationName") {
	$org = $raw_value;
	} elsif ($n_type eq "commonName") {
	$cn = $raw_value;
	} elsif ($n_type eq "emailAddress") {
	$email = $raw_value;
	}
	}

	my $id_name = $email;

	if ($org && $cn) {
	# Don't use the organizationName if the commonName repeats it
	if (length($org) <= length($cn) &&
	substr($cn, 0, length($org)) eq $org) {
	$id_name = $cn;
	goto got_id_name;
	}

	# Or a signifcant chunk of it
	if (length($org) >= 7 &&
	length($cn) >= 7 &&
	substr($cn, 0, 7) eq substr($org, 0, 7)) {
	$id_name = $cn;
	goto got_id_name;
	}

	$id_name = $org . ": " . $cn;
	} elsif ($org) {
	$id_name = $org;
	} elsif ($cn) {
	$id_name = $cn;
	}

	got_id_name:

	###############################################################################
	#
	# Output the signer's name and the key identifier that we're going to include
	# in module signatures.
	#
	###############################################################################
	die $src, ": ", "X.509: Couldn't find the Subject Key Identifier extension\n"
	if (!$subject_key_id);

	my $id_key_id = asn1_retrieve($subject_key_id->[1]);

	open(OUTFD, ">$ARGV[1]") \|\| die $ARGV[1];
	print OUTFD $id_name;
	close OUTFD \|\| die $ARGV[1];

	open(OUTFD, ">$ARGV[2]") \|\| die $ARGV[2];
	print OUTFD $id_key_id;
	close OUTFD \|\| die $ARGV[2];