package CPANPLUS::Module::Checksums; use strict; use vars qw[@ISA]; use CPANPLUS::Error; use CPANPLUS::Internals::Constants; use FileHandle; use Locale::Maketext::Simple Class => 'CPANPLUS', Style => 'gettext'; use Params::Check qw[check]; use Module::Load::Conditional qw[can_load]; $Params::Check::VERBOSE = 1; @ISA = qw[ CPANPLUS::Module::Signature ]; =head1 NAME CPANPLUS::Module::Checksums =head1 SYNOPSIS $file = $modobj->checksums; $bool = $mobobj->_validate_checksum; =head1 DESCRIPTION This is a class that provides functions for checking the checksum of a distribution. Should not be loaded directly, but used via the interface provided via C. =head1 METHODS =head2 $mod->checksums Fetches the checksums file for this module object. For the options it can take, see C. Returns the location of the checksums file on success and false on error. The location of the checksums file is also stored as $mod->status->checksums =cut sub checksums { my $mod = shift or return; my $file = $mod->_get_checksums_file( @_ ); return $mod->status->checksums( $file ) if $file; return; } ### checks if the package checksum matches the one ### from the checksums file sub _validate_checksum { my $self = shift; #must be isa CPANPLUS::Module my $conf = $self->parent->configure_object; my %hash = @_; my $verbose; my $tmpl = { verbose => { default => $conf->get_conf('verbose'), store => \$verbose }, }; check( $tmpl, \%hash ) or return; ### if we can't check it, we must assume it's ok ### return $self->status->checksum_ok(1) unless can_load( modules => { 'Digest::SHA' => '0.0' } ); #class CPANPLUS::Module::Status is runtime-generated my $file = $self->_get_checksums_file( verbose => $verbose ) or ( error(loc(q[Could not fetch '%1' file], CHECKSUMS)), return ); $self->_check_signature_for_checksum_file( file => $file ) or ( error(loc(q[Could not verify '%1' file], CHECKSUMS)), return ); #for whole CHECKSUMS file my $href = $self->_parse_checksums_file( file => $file ) or ( error(loc(q[Could not parse '%1' file], CHECKSUMS)), return ); my $size = $href->{ $self->package }->{'size'}; ### the checksums file tells us the size of the archive ### but the downloaded file is of different size if( defined $size ) { if( not (-s $self->status->fetch == $size) ) { error(loc( "Archive size does not match for '%1': " . "size is '%2' but should be '%3'", $self->package, -s $self->status->fetch, $size)); return $self->status->checksum_ok(0); } } else { msg(loc("Archive size is not known for '%1'",$self->package),$verbose); } my $sha = $href->{ $self->package }->{'sha256'}; unless( defined $sha ) { msg(loc("No 'sha256' checksum known for '%1'",$self->package),$verbose); return $self->status->checksum_ok(1); } $self->status->checksum_value($sha); my $fh = FileHandle->new( $self->status->fetch ) or return; binmode $fh; my $ctx = Digest::SHA->new(256); $ctx->addfile( $fh ); my $hexdigest = $ctx->hexdigest; my $flag = $hexdigest eq $sha; $flag ? msg(loc("Checksum matches for '%1'", $self->package),$verbose) : error(loc("Checksum does not match for '%1': " . "SHA256 is '%2' but should be '%3'", $self->package, $hexdigest, $sha),$verbose); return $self->status->checksum_ok(1) if $flag; return $self->status->checksum_ok(0); } ### fetches the module objects checksum file ### sub _get_checksums_file { my $self = shift; my %hash = @_; my $clone = $self->clone; $clone->package( CHECKSUMS ); my $file = $clone->fetch( ttl => 3600, %hash ) or return; return $file; } sub _parse_checksums_file { my $self = shift; my %hash = @_; my $file; my $tmpl = { file => { required => 1, allow => FILE_READABLE, store => \$file }, }; my $args = check( $tmpl, \%hash ); my $fh = OPEN_FILE->( $file ) or return; ### loop over the header, there might be a pgp signature ### my $signed; while (local $_ = <$fh>) { last if /^\$cksum = \{\s*$/; # skip till this line my $header = PGP_HEADER; # but be tolerant of whitespace $signed = 1 if /^${header}\s*$/;# due to crossplatform linebreaks } ### read the filehandle, parse it rather than eval it, even though it ### *should* be valid perl code my $dist; my $cksum = {}; while (local $_ = <$fh>) { if (/^\s*'([^']+)' => \{\s*$/) { $dist = $1; } elsif (/^\s*'([^']+)' => '?([^'\n]+)'?,?\s*$/ and defined $dist) { $cksum->{$dist}{$1} = $2; } elsif (/^\s*}[,;]?\s*$/) { undef $dist; } elsif (/^__END__\s*$/) { last; } else { error( loc("Malformed %1 line: %2", CHECKSUMS, $_) ); } } return $cksum; } sub _check_signature_for_checksum_file { my $self = shift; my $conf = $self->parent->configure_object; my %hash = @_; ### you don't want to check signatures, ### so let's just return true; return 1 unless $conf->get_conf('signature'); my($force,$file,$verbose); my $tmpl = { file => { required => 1, allow => FILE_READABLE, store => \$file }, force => { default => $conf->get_conf('force'), store => \$force }, verbose => { default => $conf->get_conf('verbose'), store => \$verbose }, }; my $args = check( $tmpl, \%hash ) or return; my $fh = OPEN_FILE->($file) or return; my $signed; while (local $_ = <$fh>) { my $header = PGP_HEADER; $signed = 1 if /^$header$/; } if ( !$signed ) { msg(loc("No signature found in %1 file '%2'", CHECKSUMS, $file), $verbose); return 1 unless $force; error( loc( "%1 file '%2' is not signed -- aborting", CHECKSUMS, $file ) ); return; } if( can_load( modules => { 'Module::Signature' => '0.06' } ) ) { # local $Module::Signature::SIGNATURE = $file; # ... check signatures ... } return 1; } # Local variables: # c-indentation-style: bsd # c-basic-offset: 4 # indent-tabs-mode: nil # End: # vim: expandtab shiftwidth=4: 1;