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pesign-obs-integration
0002-kernel-sign-file-Move-x509-parsing-into-a-...
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File 0002-kernel-sign-file-Move-x509-parsing-into-a-function.patch of Package pesign-obs-integration
From 85f8f72c2f055ca2fa48ec1e7ad7911e8e3744ad Mon Sep 17 00:00:00 2001 From: Michal Suchanek <msuchanek@suse.de> Date: Tue, 4 Jan 2022 12:49:54 +0100 Subject: [PATCH 2/4] kernel-sign-file: Move x509 parsing into a function. This should not introduce any functionality change but next patch will make the parsing optional. Signed-off-by: Michal Suchanek <msuchanek@suse.de> --- kernel-sign-file | 201 +++++++++++++++++++++++++---------------------- 1 file changed, 106 insertions(+), 95 deletions(-) diff --git a/kernel-sign-file b/kernel-sign-file index ce76a40..2e5b7aa 100755 --- a/kernel-sign-file +++ b/kernel-sign-file @@ -226,113 +226,119 @@ sub asn1_pack($@) # Roughly parse the X.509 certificate # ############################################################################### -my $cursor = [ 0, length($x509_certificate), \$x509_certificate ]; - -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 | $OCTET_STRING); +sub parse_certificate($) +{ + my ($x509_certificate) = @_; + my $cursor = [ 0, length($x509_certificate), \$x509_certificate ]; + my %result; + + 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); + $result{serial_number} = asn1_extract($tbs->[1], $UNIV | $INTEGER); + my $sig_type = asn1_extract($tbs->[1], $UNIV | $CONS | $SEQUENCE); + $result{issuer} = asn1_extract($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); + + $result{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 ]; + + $result{subject_key_id} = asn1_extract($vcursor, $UNIV | $OCTET_STRING); + } + } + } - my $raw_oid = asn1_retrieve($x_oid->[1]); + ############################################################################### + # + # 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 $x_type = $OIDs{$raw_oid}; - - my $raw_value = asn1_retrieve($x_val->[1]); + my $n_type = $OIDs{$raw_oid}; - if ($x_type eq "subjectKeyIdentifier") { - my $vcursor = [ 0, length($raw_value), \$raw_value ]; + my $raw_value = asn1_retrieve($n_val->[1]); - $subject_key_id = asn1_extract($vcursor, $UNIV | $OCTET_STRING); + if ($n_type eq "organizationName") { + $org = $raw_value; + } elsif ($n_type eq "commonName") { + $cn = $raw_value; + } elsif ($n_type eq "emailAddress") { + $email = $raw_value; } } -} -############################################################################### -# -# 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; - } -} + $result{signers_name} = $email; -my $signers_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) { + $result{signers_name} = $cn; + goto got_id_name; + } -if ($org && $cn) { - # Don't use the organizationName if the commonName repeats it - if (length($org) <= length($cn) && - substr($cn, 0, length($org)) eq $org) { - $signers_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)) { + $result{signers_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)) { - $signers_name = $cn; - goto got_id_name; + $result{signers_name} = $org . ": " . $cn; + } elsif ($org) { + $result{signers_name} = $org; + } elsif ($cn) { + $result{signers_name} = $cn; } - $signers_name = $org . ": " . $cn; -} elsif ($org) { - $signers_name = $org; -} elsif ($cn) { - $signers_name = $cn; -} + got_id_name: -got_id_name: + die $x509, ": ", "X.509: Couldn't find the Subject Key Identifier extension\n" + if (!$result{subject_key_id}); -die $x509, ": ", "X.509: Couldn't find the Subject Key Identifier extension\n" - if (!$subject_key_id); - -my $key_identifier = asn1_retrieve($subject_key_id->[1]); + $result{key_identifier} = asn1_retrieve($result{subject_key_id}->[1]); + return %result; +} ############################################################################### # # Create and attach the module signature @@ -430,8 +436,13 @@ if ($signature_file) { "openssl rsautl -sign -inkey $private_key -keyform PEM"); } +my %certdata = parse_certificate($x509_certificate); +my $signers_name; +my $key_identifier; if ($id_type == 1) { $signature = pack("n", length($signature)) . $signature, + $signers_name = $certdata{signers_name}; + $key_identifier = $certdata{key_identifier}; } elsif ($id_type == 2) { # create PKCS7 signature $signature = asn1_pack($UNIV | $OCTET_STRING, $signature); @@ -439,10 +450,10 @@ if ($id_type == 1) { my $digest_algo_seq = asn1_pack($UNIV | $CONS | $SEQUENCE, $digest_algo); my $digest_algo_seq_set = asn1_pack($UNIV | $CONS | $SET, $digest_algo_seq); my $si_verstion = asn1_pack($UNIV | $INTEGER, pack('C', $use_keyid ? 3 : 1)); - my $si_issuer = asn1_pack($issuer->[0], asn1_retrieve($issuer->[1])); - my $si_serial = asn1_pack($serial_number->[0], asn1_retrieve($serial_number->[1])); + my $si_issuer = asn1_pack($certdata{issuer}->[0], asn1_retrieve($certdata{issuer}->[1])); + my $si_serial = asn1_pack($certdata{serial_number}->[0], asn1_retrieve($certdata{serial_number}->[1])); my $si_issuer_serial = asn1_pack($UNIV | $CONS | $SEQUENCE, $si_issuer, $si_serial); - my $si_keyid = asn1_pack($CONT | 0, asn1_retrieve($subject_key_id->[1])); + my $si_keyid = asn1_pack($CONT | 0, asn1_retrieve($certdata{subject_key_id}->[1])); my $rsa_encryption = asn1_pack($UNIV | $OBJ_ID, pack("CCCCCCCCC", 42, 134, 72, 134, 247, 13, 1, 1, 1)); my $encryption_seq = asn1_pack($UNIV | $CONS | $SEQUENCE, $rsa_encryption, asn1_pack($UNIV | $NULL)); my $signer_identifier = $use_keyid ? $si_keyid : $si_issuer_serial; -- 2.34.1
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