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authorJames Morris <james.l.morris@oracle.com>2015-10-23 04:07:52 +0300
committerJames Morris <james.l.morris@oracle.com>2015-10-23 04:07:52 +0300
commitba94c3ff20c9c179f2a80f0e4c71e1571ebbf5c7 (patch)
tree8f94d0fcb68cdcff0d00a7911ddb494705cf7c72 /scripts
parenta47c7a6c8aff0563c0ef4adf299268f3c27af0f6 (diff)
parent146aa8b1453bd8f1ff2304ffb71b4ee0eb9acdcc (diff)
downloadlinux-ba94c3ff20c9c179f2a80f0e4c71e1571ebbf5c7.tar.xz
Merge tag 'keys-next-20151021' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs into next
Diffstat (limited to 'scripts')
-rwxr-xr-xscripts/extract-module-sig.pl136
-rwxr-xr-xscripts/extract-sys-certs.pl144
2 files changed, 280 insertions, 0 deletions
diff --git a/scripts/extract-module-sig.pl b/scripts/extract-module-sig.pl
new file mode 100755
index 000000000000..faac6f2e377f
--- /dev/null
+++ b/scripts/extract-module-sig.pl
@@ -0,0 +1,136 @@
+#!/usr/bin/perl -w
+#
+# extract-mod-sig <part> <module-file>
+#
+# Reads the module file and writes out some or all of the signature
+# section to stdout. Part is the bit to be written and is one of:
+#
+# -0: The unsigned module, no signature data at all
+# -a: All of the signature data, including magic number
+# -d: Just the descriptor values as a sequence of numbers
+# -n: Just the signer's name
+# -k: Just the key ID
+# -s: Just the crypto signature or PKCS#7 message
+#
+use strict;
+
+die "Format: $0 -[0adnks] module-file >out\n"
+ if ($#ARGV != 1);
+
+my $part = $ARGV[0];
+my $modfile = $ARGV[1];
+
+my $magic_number = "~Module signature appended~\n";
+
+#
+# Read the module contents
+#
+open FD, "<$modfile" || die $modfile;
+binmode(FD);
+my @st = stat(FD);
+die "$modfile" unless (@st);
+my $buf = "";
+my $len = sysread(FD, $buf, $st[7]);
+die "$modfile" unless (defined($len));
+die "Short read on $modfile\n" unless ($len == $st[7]);
+close(FD) || die $modfile;
+
+print STDERR "Read ", $len, " bytes from module file\n";
+
+die "The file is too short to have a sig magic number and descriptor\n"
+ if ($len < 12 + length($magic_number));
+
+#
+# Check for the magic number and extract the information block
+#
+my $p = $len - length($magic_number);
+my $raw_magic = substr($buf, $p);
+
+die "Magic number not found at $len\n"
+ if ($raw_magic ne $magic_number);
+print STDERR "Found magic number at $len\n";
+
+$p -= 12;
+my $raw_info = substr($buf, $p, 12);
+
+my @info = unpack("CCCCCxxxN", $raw_info);
+my ($algo, $hash, $id_type, $name_len, $kid_len, $sig_len) = @info;
+
+if ($id_type == 0) {
+ print STDERR "Found PGP key identifier\n";
+} elsif ($id_type == 1) {
+ print STDERR "Found X.509 cert identifier\n";
+} elsif ($id_type == 2) {
+ print STDERR "Found PKCS#7/CMS encapsulation\n";
+} else {
+ print STDERR "Found unsupported identifier type $id_type\n";
+}
+
+#
+# Extract the three pieces of info data
+#
+die "Insufficient name+kid+sig data in file\n"
+ unless ($p >= $name_len + $kid_len + $sig_len);
+
+$p -= $sig_len;
+my $raw_sig = substr($buf, $p, $sig_len);
+$p -= $kid_len;
+my $raw_kid = substr($buf, $p, $kid_len);
+$p -= $name_len;
+my $raw_name = substr($buf, $p, $name_len);
+
+my $module_len = $p;
+
+if ($sig_len > 0) {
+ print STDERR "Found $sig_len bytes of signature [";
+ my $n = $sig_len > 16 ? 16 : $sig_len;
+ foreach my $i (unpack("C" x $n, substr($raw_sig, 0, $n))) {
+ printf STDERR "%02x", $i;
+ }
+ print STDERR "]\n";
+}
+
+if ($kid_len > 0) {
+ print STDERR "Found $kid_len bytes of key identifier [";
+ my $n = $kid_len > 16 ? 16 : $kid_len;
+ foreach my $i (unpack("C" x $n, substr($raw_kid, 0, $n))) {
+ printf STDERR "%02x", $i;
+ }
+ print STDERR "]\n";
+}
+
+if ($name_len > 0) {
+ print STDERR "Found $name_len bytes of signer's name [$raw_name]\n";
+}
+
+#
+# Produce the requested output
+#
+if ($part eq "-0") {
+ # The unsigned module, no signature data at all
+ binmode(STDOUT);
+ print substr($buf, 0, $module_len);
+} elsif ($part eq "-a") {
+ # All of the signature data, including magic number
+ binmode(STDOUT);
+ print substr($buf, $module_len);
+} elsif ($part eq "-d") {
+ # Just the descriptor values as a sequence of numbers
+ print join(" ", @info), "\n";
+} elsif ($part eq "-n") {
+ # Just the signer's name
+ print STDERR "No signer's name for PKCS#7 message type sig\n"
+ if ($id_type == 2);
+ binmode(STDOUT);
+ print $raw_name;
+} elsif ($part eq "-k") {
+ # Just the key identifier
+ print STDERR "No key ID for PKCS#7 message type sig\n"
+ if ($id_type == 2);
+ binmode(STDOUT);
+ print $raw_kid;
+} elsif ($part eq "-s") {
+ # Just the crypto signature or PKCS#7 message
+ binmode(STDOUT);
+ print $raw_sig;
+}
diff --git a/scripts/extract-sys-certs.pl b/scripts/extract-sys-certs.pl
new file mode 100755
index 000000000000..d476e7d1fd88
--- /dev/null
+++ b/scripts/extract-sys-certs.pl
@@ -0,0 +1,144 @@
+#!/usr/bin/perl -w
+#
+use strict;
+use Math::BigInt;
+use Fcntl "SEEK_SET";
+
+die "Format: $0 [-s <systemmap-file>] <vmlinux-file> <keyring-file>\n"
+ if ($#ARGV != 1 && $#ARGV != 3 ||
+ $#ARGV == 3 && $ARGV[0] ne "-s");
+
+my $sysmap = "";
+if ($#ARGV == 3) {
+ shift;
+ $sysmap = $ARGV[0];
+ shift;
+}
+
+my $vmlinux = $ARGV[0];
+my $keyring = $ARGV[1];
+
+#
+# Parse the vmlinux section table
+#
+open FD, "objdump -h $vmlinux |" || die $vmlinux;
+my @lines = <FD>;
+close(FD) || die $vmlinux;
+
+my @sections = ();
+
+foreach my $line (@lines) {
+ chomp($line);
+ if ($line =~ /\s*([0-9]+)\s+(\S+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9a-f]+)\s+2[*][*]([0-9]+)/
+ ) {
+ my $seg = $1;
+ my $name = $2;
+ my $len = Math::BigInt->new("0x" . $3);
+ my $vma = Math::BigInt->new("0x" . $4);
+ my $lma = Math::BigInt->new("0x" . $5);
+ my $foff = Math::BigInt->new("0x" . $6);
+ my $align = 2 ** $7;
+
+ push @sections, { name => $name,
+ vma => $vma,
+ len => $len,
+ foff => $foff };
+ }
+}
+
+print "Have $#sections sections\n";
+
+#
+# Try and parse the vmlinux symbol table. If the vmlinux file has been created
+# from a vmlinuz file with extract-vmlinux then the symbol table will be empty.
+#
+open FD, "nm $vmlinux 2>/dev/null |" || die $vmlinux;
+@lines = <FD>;
+close(FD) || die $vmlinux;
+
+my %symbols = ();
+my $nr_symbols = 0;
+
+sub parse_symbols(@) {
+ foreach my $line (@_) {
+ chomp($line);
+ if ($line =~ /([0-9a-f]+)\s([a-zA-Z])\s(\S+)/
+ ) {
+ my $addr = "0x" . $1;
+ my $type = $2;
+ my $name = $3;
+
+ $symbols{$name} = $addr;
+ $nr_symbols++;
+ }
+ }
+}
+parse_symbols(@lines);
+
+if ($nr_symbols == 0 && $sysmap ne "") {
+ print "No symbols in vmlinux, trying $sysmap\n";
+
+ open FD, "<$sysmap" || die $sysmap;
+ @lines = <FD>;
+ close(FD) || die $sysmap;
+ parse_symbols(@lines);
+}
+
+die "No symbols available\n"
+ if ($nr_symbols == 0);
+
+print "Have $nr_symbols symbols\n";
+
+die "Can't find system certificate list"
+ unless (exists($symbols{"__cert_list_start"}) &&
+ exists($symbols{"__cert_list_end"}));
+
+my $start = Math::BigInt->new($symbols{"__cert_list_start"});
+my $end = Math::BigInt->new($symbols{"__cert_list_end"});
+my $size = $end - $start;
+
+printf "Have %u bytes of certs at VMA 0x%x\n", $size, $start;
+
+my $s = undef;
+foreach my $sec (@sections) {
+ my $s_name = $sec->{name};
+ my $s_vma = $sec->{vma};
+ my $s_len = $sec->{len};
+ my $s_foff = $sec->{foff};
+ my $s_vend = $s_vma + $s_len;
+
+ next unless ($start >= $s_vma);
+ next if ($start >= $s_vend);
+
+ die "Cert object partially overflows section $s_name\n"
+ if ($end > $s_vend);
+
+ die "Cert object in multiple sections: ", $s_name, " and ", $s->{name}, "\n"
+ if ($s);
+ $s = $sec;
+}
+
+die "Cert object not inside a section\n"
+ unless ($s);
+
+print "Certificate list in section ", $s->{name}, "\n";
+
+my $foff = $start - $s->{vma} + $s->{foff};
+
+printf "Certificate list at file offset 0x%x\n", $foff;
+
+open FD, "<$vmlinux" || die $vmlinux;
+binmode(FD);
+die $vmlinux if (!defined(sysseek(FD, $foff, SEEK_SET)));
+my $buf = "";
+my $len = sysread(FD, $buf, $size);
+die "$vmlinux" if (!defined($len));
+die "Short read on $vmlinux\n" if ($len != $size);
+close(FD) || die $vmlinux;
+
+open FD, ">$keyring" || die $keyring;
+binmode(FD);
+$len = syswrite(FD, $buf, $size);
+die "$keyring" if (!defined($len));
+die "Short write on $keyring\n" if ($len != $size);
+close(FD) || die $keyring;