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openssl/util/incore

448 lines
12 KiB
Perl
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#!/usr/bin/env perl
#
# Copyright (c) 2011 The OpenSSL Project.
#
# The script embeds fingerprint into ELF executable object, either
# application binary or shared library.
######################################################################
#
# ELF symbol table parser by <appro@openssl.org>. The table entries
# are extended with offset within executable file...
#
{ package ELF;
use FileHandle;
sub dup { my %copy=map {$_} @_; return \%copy; }
sub Load {
my $class = shift;
my $self = {};
my $FD = FileHandle->new(); # autoclose
bless $self,$class;
sysopen($FD,shift,0) or die "$!";
binmode($FD);
#################################################
# read and parse elf_ehdr.e_ident...
#
read($FD,my $elf,16) or die "$!";
my %e_ident;
@e_ident{magic,class,data,version,osabi,abiver,pad}=
unpack("a4C*",$elf);
$!=42; # signal fipsld to revert to two-step link
die "not ELF file" if ($e_ident{magic} ne chr(0177)."ELF");
my $elf_bits = $e_ident{class}*32; # 32 or 64
my $big_endian = $e_ident{data}-1; # 0 or 1
if ($elf_bits==64) {
if (!(((1<<31)<<1) && $big_endian==(unpack("L",pack("N",1))==1))) {
die "ELF64 is supported only natively";
}
}
#################################################
# read and parse remainder of elf_ehdr...
#
read($FD,my $elfhdr,64) or die "$!";
my %elf_ehdr;
@elf_ehdr{e_type,e_machine,e_version,
e_entry,e_phoff,e_shoff,e_flags,e_ehsize,
e_phentsize,e_phnum,e_shentsize,e_shnum,e_shstrndx} =
$elf_bits==32 ?
unpack($big_endian?"nnN5n6":"vvV5v6",$elfhdr)
: unpack("SSLQ3LS6",$elfhdr);
# put aside e_machine in case one has to treat specific
# platforms differently, see EM_ constants in elf.h for
# assortment...
$self->{e_machine} = $elf_ehdr{e_machine};
#################################################
# read and parse elf_shdr table...
#
my ($i,$sz,$symtab_idx,$blob,$strings);
seek($FD,$elf_ehdr{e_shoff},0) or die "$!";
read($FD,$blob,$elf_ehdr{e_shentsize}*$elf_ehdr{e_shnum}) or die "$!";
my @sections;
my $elf_shdr_struct=($elf_bits==32?($big_endian?"N10":"V10"):"L2Q4L2Q2");
for ($sz=$elf_ehdr{e_shentsize},$i=0;$i<length($blob);$i+=$sz) {
my %elf_shdr;
@elf_shdr{sh_name,sh_type,sh_flags,
sh_addr,sh_offset,sh_size,
sh_link,sh_info,sh_addalign,sh_entsize} =
unpack($elf_shdr_struct,substr($blob,$i,$sz));
push(@sections,dup(%elf_shdr));
# note SHT_SYMTAB or SHT_DYNSYM for future reference
if ($elf_shdr{sh_type}==2 || $elf_shdr{sh_type}==11) {
$symtab_idx = $#sections;
}
}
# read strings table and map section names...
seek($FD,@sections[$elf_ehdr{e_shstrndx}]->{sh_offset},0) or die "$!";
read($FD,$strings,@sections[$elf_ehdr{e_shstrndx}]->{sh_size}) or die "$!";
for (@sections) {
$_->{sh_name}=(split(chr(0),substr($strings,$_->{sh_name},64)))[0];
}
#################################################
# read symbol strings table...
#
$i=@sections[$symtab_idx]->{sh_link};
seek($FD,@sections[$i]->{sh_offset},0) or die "$!";
read($FD,$strings,@sections[$i]->{sh_size}) or die "$!";
#################################################
# read and parse elf_sym table...
#
seek($FD,@sections[$symtab_idx]->{sh_offset},0) or die "$!";
read($FD,my $blob,@sections[$symtab_idx]->{sh_size}) or die "$!";
for ($sz=@sections[$symtab_idx]->{sh_entsize},$i=0;$i<length($blob);$i+=$sz) {
my %elf_sym;
if ($elf_bits==32) {
@elf_sym{st_name,st_value,st_size,st_info,st_other,st_shndx} =
unpack($big_endian?"N3CCn":"V3CCv",substr($blob,$i,$sz));
} else {
@elf_sym{st_name,st_info,st_other,st_shndx,st_value,st_size} =
unpack("LCCSQQ",substr($blob,$i,$sz));
}
my $st_type = $elf_sym{st_info}&0xf;
my $st_bind = $elf_sym{st_info}>>4;
my $st_secn = $elf_sym{st_shndx};
my $name;
# (STT_OBJECT || STT_FUNC)
if ($st_bind<3 && ($st_type==1 || $st_type==2)
&& $st_secn <= $#sections # sane st_shndx
&& @sections[$st_secn]->{sh_type} # not SHN_UNDEF
&& ($name=(split(chr(0),substr($strings,$elf_sym{st_name},128)))[0])
) {
# synthesize st_offset, ...
$elf_sym{st_offset} = $elf_sym{st_value}
- @sections[$st_secn]->{sh_addr}
+ @sections[$st_secn]->{sh_offset};
$elf_sym{st_name} = $name;
$elf_sym{st_section} = @sections[$st_secn]->{sh_name};
# ... and add to lookup table
$self->{symbols}{$name} = dup(%elf_sym);
}
}
return $self;
}
sub Lookup {
my $self = shift;
my $name = shift;
return $self->{symbols}{$name};
}
sub Traverse {
my $self = shift;
my $code = shift;
if (ref($code) eq 'CODE') {
for (keys(%{$self->{symbols}})) { &$code($self->{symbols}{$_}); }
}
}
}
######################################################################
#
# SHA1 and HMAC in Perl by <appro@openssl.org>.
#
{ package SHA1;
use integer;
{
################################### SHA1 block code generator
my @V = ('$A','$B','$C','$D','$E');
my $i;
sub XUpdate {
my $ret;
$ret="(\$T=\$W[($i-16)%16]^\$W[($i-14)%16]^\$W[($i-8)%16]^\$W[($i-3)%16],\n\t";
if ((1<<31)<<1) {
$ret.=" \$W[$i%16]=((\$T<<1)|(\$T>>31))&0xffffffff)\n\t ";
} else {
$ret.=" \$W[$i%16]=(\$T<<1)|((\$T>>31)&1))\n\t ";
}
}
sub tail {
my ($a,$b,$c,$d,$e)=@V;
my $ret;
if ((1<<31)<<1) {
$ret.="(($a<<5)|($a>>27));\n\t";
$ret.="$b=($b<<30)|($b>>2); $e&=0xffffffff; #$b&=0xffffffff;\n\t";
} else {
$ret.="(($a<<5)|($a>>27)&0x1f);\n\t";
$ret.="$b=($b<<30)|($b>>2)&0x3fffffff;\n\t";
}
$ret;
}
sub BODY_00_15 {
my ($a,$b,$c,$d,$e)=@V;
"$e+=\$W[$i]+0x5a827999+((($c^$d)&$b)^$d)+".tail();
}
sub BODY_16_19 {
my ($a,$b,$c,$d,$e)=@V;
"$e+=".XUpdate()."+0x5a827999+((($c^$d)&$b)^$d)+".tail();
}
sub BODY_20_39 {
my ($a,$b,$c,$d,$e)=@V;
"$e+=".XUpdate()."+0x6ed9eba1+($b^$c^$d)+".tail();
}
sub BODY_40_59 {
my ($a,$b,$c,$d,$e)=@V;
"$e+=".XUpdate()."+0x8f1bbcdc+(($b&$c)|(($b|$c)&$d))+".tail();
}
sub BODY_60_79 {
my ($a,$b,$c,$d,$e)=@V;
"$e+=".XUpdate()."+0xca62c1d6+($b^$c^$d)+".tail();
}
my $sha1_impl =
'sub block {
my $self = @_[0];
my @W = unpack("N16",@_[1]);
my ($A,$B,$C,$D,$E,$T) = @{$self->{H}};
';
$sha1_impl.='
$A &= 0xffffffff;
$B &= 0xffffffff;
' if ((1<<31)<<1);
for($i=0;$i<16;$i++){ $sha1_impl.=BODY_00_15(); unshift(@V,pop(@V)); }
for(;$i<20;$i++) { $sha1_impl.=BODY_16_19(); unshift(@V,pop(@V)); }
for(;$i<40;$i++) { $sha1_impl.=BODY_20_39(); unshift(@V,pop(@V)); }
for(;$i<60;$i++) { $sha1_impl.=BODY_40_59(); unshift(@V,pop(@V)); }
for(;$i<80;$i++) { $sha1_impl.=BODY_60_79(); unshift(@V,pop(@V)); }
$sha1_impl.='
$self->{H}[0]+=$A; $self->{H}[1]+=$B; $self->{H}[2]+=$C;
$self->{H}[3]+=$D; $self->{H}[4]+=$E; }';
#print $sha1_impl,"\n";
eval($sha1_impl); # generate code
}
sub Init {
my $class = shift; # multiple instances...
my $self = {};
bless $self,$class;
$self->{H} = [0x67452301,0xefcdab89,0x98badcfe,0x10325476,0xc3d2e1f0];
$self->{N} = 0;
return $self;
}
sub Update {
my $self = shift;
my $msg;
foreach $msg (@_) {
my $len = length($msg);
my $num = length($self->{buf});
my $off = 0;
$self->{N} += $len;
if (($num+$len)<64)
{ $self->{buf} .= $msg; next; }
elsif ($num)
{ $self->{buf} .= substr($msg,0,($off=64-$num));
$self->block($self->{buf});
}
while(($off+64) <= $len)
{ $self->block(substr($msg,$off,64));
$off += 64;
}
$self->{buf} = substr($msg,$off);
}
return $self;
}
sub Final {
my $self = shift;
my $num = length($self->{buf});
$self->{buf} .= chr(0x80); $num++;
if ($num>56)
{ $self->{buf} .= chr(0)x(64-$num);
$self->block($self->{buf});
$self->{buf}=undef;
$num=0;
}
$self->{buf} .= chr(0)x(56-$num);
$self->{buf} .= pack("N2",($self->{N}>>29)&0x7,$self->{N}<<3);
$self->block($self->{buf});
return pack("N*",@{$self->{H}});
}
sub Selftest {
my $hash;
$hash=SHA1->Init()->Update('abc')->Final();
die "SHA1 test#1" if (unpack("H*",$hash) ne 'a9993e364706816aba3e25717850c26c9cd0d89d');
$hash=SHA1->Init()->Update('abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq')->Final();
die "SHA1 test#2" if (unpack("H*",$hash) ne '84983e441c3bd26ebaae4aa1f95129e5e54670f1');
#$hash=SHA1->Init()->Update('a'x1000000)->Final();
#die "SHA1 test#3" if (unpack("H*",$hash) ne '34aa973cd4c4daa4f61eeb2bdbad27316534016f');
}
}
{ package HMAC;
sub Init {
my $class = shift;
my $key = shift;
my $self = {};
bless $self,$class;
if (length($key)>64) {
$key = SHA1->Init()->Update($key)->Final();
}
$key .= chr(0x00)x(64-length($key));
my @ikey = map($_^=0x36,unpack("C*",$key));
($self->{hash} = SHA1->Init())->Update(pack("C*",@ikey));
$self->{okey} = pack("C*",map($_^=0x36^0x5c,@ikey));
return $self;
}
sub Update {
my $self = shift;
$self->{hash}->Update(@_);
return $self;
}
sub Final {
my $self = shift;
my $ihash = $self->{hash}->Final();
return SHA1->Init()->Update($self->{okey},$ihash)->Final();
}
sub Selftest {
my $hmac;
$hmac = HMAC->Init('0123456789:;<=>?@ABC')->Update('Sample #2')->Final();
die "HMAC test" if (unpack("H*",$hmac) ne '0922d3405faa3d194f82a45830737d5cc6c75d24');
}
}
######################################################################
#
# main()
#
my $legacy_mode;
if ($ARGV<0 || ($#ARGV>0 && !($legacy_mode=(@ARGV[0] =~ /^\-(dso|exe)$/)))) {
print STDERR "usage: $0 [-dso|-exe] elfbinary\n";
exit(1);
}
$exe = ELF->Load(@ARGV[$#ARGV]);
$FIPS_text_start = $exe->Lookup("FIPS_text_start") or die;
$FIPS_text_end = $exe->Lookup("FIPS_text_end") or die;
$FIPS_rodata_start = $exe->Lookup("FIPS_rodata_start") or die;
$FIPS_rodata_end = $exe->Lookup("FIPS_rodata_end") or die;
$FIPS_signature = $exe->Lookup("FIPS_signature") or die;
# new cross-compile support
$FIPS_text_startX = $exe->Lookup("FIPS_text_startX");
$FIPS_text_endX = $exe->Lookup("FIPS_text_endX");
if (!$legacy_mode) {
if (!$FIPS_text_startX || !$FIPS_text_endX) {
print STDERR "@ARGV[$#ARGV] is not cross-compiler aware.\n";
exit(42); # signal fipsld to revert to two-step link
}
$FINGERPRINT_ascii_value
= $exe->Lookup("FINGERPRINT_ascii_value") or die;
}
if ($FIPS_text_startX && $FIPS_text_endX) {
$FIPS_text_start = $FIPS_text_startX;
$FIPS_text_end = $FIPS_text_endX;
}
sysopen(FD,@ARGV[$#ARGV],$legacy_mode?0:2) or die "$!"; # 2 is read/write
binmode(FD);
sub HMAC_Update {
my ($hmac,$off,$len) = @_;
my $blob;
seek(FD,$off,0) or die "$!";
read(FD,$blob,$len) or die "$!";
$$hmac->Update($blob);
}
# fips/fips.c:FIPS_incore_fingerprint's Perl twin
#
sub FIPS_incore_fingerprint {
my $p1 = $FIPS_text_start->{st_offset};
my $p2 = $FIPS_text_end->{st_offset};
my $p3 = $FIPS_rodata_start->{st_offset};
my $p4 = $FIPS_rodata_end->{st_offset};
my $sig = $FIPS_signature->{st_offset};
my $ctx = HMAC->Init("etaonrishdlcupfm");
# detect overlapping regions
if ($p1<=$p3 && $p2>=$p3) {
$p3 = $p1; $p4 = $p2>$p4?$p2:$p4; $p1 = 0; $p2 = 0;
} elsif ($p3<=$p1 && $p4>=$p1) {
$p3 = $p3; $p4 = $p2>$p4?$p2:$p4; $p1 = 0; $p2 = 0;
}
if ($p1) {
HMAC_Update (\$ctx,$p1,$p2-$p1);
}
if ($sig>=$p3 && $sig<$p4) {
# "punch" hole
HMAC_Update(\$ctx,$p3,$sig-$p3);
$p3 = $sig+20;
HMAC_Update(\$ctx,$p3,$p4-$p3);
} else {
HMAC_Update(\$ctx,$p3,$p4-$p3);
}
return $ctx->Final();
}
$fingerprint = FIPS_incore_fingerprint();
if ($legacy_mode) {
print unpack("H*",$fingerprint);
} else {
seek(FD,$FINGERPRINT_ascii_value->{st_offset},0) or die "$!";
print FD unpack("H*",$fingerprint) or die "$!";
}
close (FD);
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