use warnings;
use Getopt::Long ();
-use Term::ANSIColor ();
use Text::ParseWords ();
-our $VERSION = '0.01';
+our $VERSION = '0.02';
# CONSTANTS/VARIABLES
# Regex to catch compiler commands.
-my $cc_regex = qr/(?:[a-z0-9_]+-(?:linux-|kfreebsd-)?gnu(?:eabi|eabihf)?-)?
- (?<!\.)(?:cc|gcc|g\+\+|c\+\+)
- (?:-[\d.]+)?/x;
+my $cc_regex = qr/
+ (?<!\s-) # ignore options, e.g. "-c++" [sic!] (used by swig)
+ (?<!\.) # ignore file names, e.g. "test.gcc"
+ (?:cc|gcc|g\+\+|c\+\+)
+ (?:-[\d.]+)? # version suffix, e.g. "gcc-4.6"
+ /x;
+# Full regex which matches the complete compiler name. Used in a few places to
+# prevent false negatives.
+my $cc_regex_full = qr/
+ (?:[a-z0-9_]+-(?:linux-|kfreebsd-)?gnu(?:eabi|eabihf)?-)?
+ $cc_regex
+ /x;
# Regex to catch (GCC) compiler warnings.
-my $warning_regex = qr/^(.+?):([0-9]+):[0-9]+: warning: (.+?) \[(.+?)\]$/;
+my $warning_regex = qr/^(.+?):(\d+):\d+: warning: (.+?) \[(.+?)\]$/;
# List of source file extensions which require preprocessing.
my @source_preprocess_compile_cpp = (
# C++
qw( cc cp cxx cpp CPP c++ C ),
# Objective-C++
- qw( mm Mr),
+ qw( mm M ),
);
my @source_preprocess_compile = (
# C
);
my @source_preprocess_no_compile = (
# Assembly
- qw( s ),
+ qw( S sx ),
);
my @source_preprocess = (
@source_preprocess_compile,
);
my @source_no_preprocess_no_compile = (
# Assembly
- qw( S sx ),
+ qw( s ),
);
my @source_no_preprocess = (
@source_no_preprocess_compile,
);
my %extension = map { $_ => 1 } (
@source_no_preprocess,
- @source_no_preprocess_compile,
- @source_no_preprocess_compile_cpp,
- @source_no_preprocess_no_compile,
@header_preprocess,
@source_preprocess,
- @source_preprocess_compile,
- @source_preprocess_compile_cpp,
- @source_preprocess_no_compile,
);
# Regexp to match file extensions.
my $file_extension_regex = qr/
\s
- \S+ # Filename without extension.
+ \S+ # Filename without extension.
\.
- ([^\\.\s]+) # File extension.
- (?=\s|\\) # At end of word. Can't use \b because some files have non
- # word characters at the end and because \b matches double
- # extensions (like .cpp.o). Works always as all lines are
- # terminated with "\n".
+ ([^\/\\.,;:\s]+)# File extension.
+ (?=\s|\\) # At end of word. Can't use \b because some files have non
+ # word characters at the end and because \b matches double
+ # extensions (like .cpp.o). Works always as all lines are
+ # terminated with "\n".
/x;
# Expected (hardening) flags. All flags are used as regexps.
);
my @def_cflags_format = (
'-Wformat',
- '-Wformat-security',
- '-Werror=format-security',
+ '-Werror=format-security', # implies -Wformat-security
);
my @def_cflags_fortify = (
# fortify needs at least -O1, but -O2 is recommended anyway
'-fPIE',
);
my @def_cxxflags = (
- '-g',
- '-O(?:2|3)',
+ @def_cflags,
);
# @def_cxxflags_* is the same as @def_cflags_*.
my @def_cppflags = ();
my @def_cppflags_fortify = (
- '-D_FORTIFY_SOURCE=2',
+ '-D_FORTIFY_SOURCE=2', # must be first, see cppflags_fortify_broken()
+);
+my @def_cppflags_fortify_bad = (
+ # These flags may overwrite -D_FORTIFY_SOURCE=2.
+ '-D_FORTIFY_SOURCE=0',
+ '-D_FORTIFY_SOURCE=1',
);
my @def_ldflags = ();
my @def_ldflags_relro = (
- '-Wl,(-z,)?relro',
+ '-Wl,(?:-z,)?relro',
);
my @def_ldflags_bindnow = (
- '-Wl,(-z,)?now',
+ '-Wl,(?:-z,)?now',
);
my @def_ldflags_pie = (
'-fPIE',
'-pie',
);
-# Renaming rules for the output so the regex parts are not visible.
+my @def_ldflags_pic = (
+ '-fPIC',
+ '-fpic',
+ '-shared',
+);
+# References to all flags checked by the flag checker.
+my @flag_refs = (
+ \@def_cflags,
+ \@def_cflags_format,
+ \@def_cflags_fortify,
+ \@def_cflags_stack,
+ \@def_cflags_pie,
+ \@def_cxxflags,
+ \@def_cppflags,
+ \@def_cppflags_fortify,
+ \@def_ldflags,
+ \@def_ldflags_relro,
+ \@def_ldflags_bindnow,
+ \@def_ldflags_pie,
+);
+# References to all used flags.
+my @flag_refs_all = (
+ @flag_refs,
+ \@def_cppflags_fortify_bad,
+ \@def_ldflags_pic,
+);
+# Renaming rules for the output so the regex parts are not visible. Also
+# stores string values of flag regexps above, see compile_flag_regexp().
my %flag_renames = (
- '-O(?:2|3)' => '-O2',
- '-Wl,(-z,)?relro' => '-Wl,-z,relro',
- '-Wl,(-z,)?now' => '-Wl,-z,now',
+ '-O(?:2|3)' => '-O2',
+ '-Wl,(?:-z,)?relro' => '-Wl,-z,relro',
+ '-Wl,(?:-z,)?now' => '-Wl,-z,now',
+);
+
+my %exit_code = (
+ no_compiler_commands => 1 << 0,
+ # used by POD::Usage => 1 << 1,
+ non_verbose_build => 1 << 2,
+ flags_missing => 1 << 3,
+ hardening_wrapper => 1 << 4,
+ invalid_cmake => 1 << 5,
+);
+
+my %buildd_tag = (
+ no_compiler_commands => 'I-no-compiler-commands',
+ non_verbose_build => 'W-compiler-flags-hidden',
+ flags_missing => 'W-dpkg-buildflags-missing',
+ hardening_wrapper => 'I-hardening-wrapper-used',
+ invalid_cmake => 'I-invalid-cmake-used',
+);
+
+# Statistics of missing flags and non-verbose build commands. Used for
+# $option_buildd.
+my %statistics = (
+ preprocess => 0,
+ preprocess_missing => 0,
+ compile => 0,
+ compile_missing => 0,
+ compile_cpp => 0,
+ compile_cpp_missing => 0,
+ link => 0,
+ link_missing => 0,
+ commands => 0,
+ commands_nonverbose => 0,
);
# Use colored (ANSI) output?
sub error_flags {
my ($message, $missing_flags_ref, $flag_renames_ref, $line) = @_;
- # Rename flags if requested.
+ # Get string value of qr//-escaped regexps and if requested rename them.
my @missing_flags = map {
- (exists $flag_renames_ref->{$_})
- ? $flag_renames_ref->{$_}
- : $_
- } @{$missing_flags_ref};
+ $flag_renames_ref->{$_}
+ } @{$missing_flags_ref};
my $flags = join ' ', @missing_flags;
- printf "%s (%s)%s %s",
+ printf '%s (%s)%s %s',
error_color($message, 'red'), $flags, error_color(':', 'yellow'),
$line;
}
sub error_non_verbose_build {
my ($line) = @_;
- printf "%s%s %s",
+ printf '%s%s %s',
error_color('NONVERBOSE BUILD', 'red'),
error_color(':', 'yellow'),
$line;
}
+sub error_invalid_cmake {
+ my ($version) = @_;
+
+ printf "%s%s %s\n",
+ error_color('INVALID CMAKE', 'red'),
+ error_color(':', 'yellow'),
+ $version;
+}
sub error_hardening_wrapper {
printf "%s%s %s\n",
error_color('HARDENING WRAPPER', 'red'),
my ($line, @flags) = @_;
foreach my $flag (@flags) {
- return 1 if $line =~ /\s$flag(?:\s|\\)/;
+ return 1 if $line =~ /$flag/;
}
return 0;
my @missing_flags = ();
foreach my $flag (@flags) {
- if ($line !~ /\s$flag(?:\s|\\)/) {
+ if (not $line =~ /$flag/) {
push @missing_flags, $flag;
}
}
return 0;
}
+sub cppflags_fortify_broken {
+ my ($line, $missing_flags) = @_;
+
+ # This doesn't take the position into account, but is a simple solution.
+ # And if the build system tries to force -D_FORTIFY_SOURCE=0/1, something
+ # is wrong anyway.
+
+ if (any_flags_used($line, @def_cppflags_fortify_bad)) {
+ # $def_cppflags_fortify[0] must be -D_FORTIFY_SOURCE=2!
+ push @{$missing_flags}, $def_cppflags_fortify[0];
+ return 1;
+ }
+
+ return 0;
+}
+
# Modifies $missing_flags_ref array.
sub pic_pie_conflict {
my ($line, $pie, $missing_flags_ref, @flags_pie) = @_;
return 0 if not $pie;
- return 0 if not any_flags_used($line, ('-fPIC', '-fpic'));
+ return 0 if not any_flags_used($line, @def_ldflags_pic);
my %flags = map { $_ => 1 } @flags_pie;
sub is_non_verbose_build {
my ($line, $next_line, $skip_ref) = @_;
- if (not ($line =~ /^checking if you want to see long compiling messages\.\.\. no/
- or $line =~ /^\s*\[?(?:CC|CCLD|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
- or $line =~ /^\s*(?:C|c)ompiling\s+(.+?)(?:\.\.\.)?$/
- or $line =~ /^\s*(?:B|b)uilding (?:program|shared library)\s+(.+?)$/
+ if (not (index($line, 'checking if you want to see long compiling messages... no') == 0
+ or $line =~ /^\s*\[?(?:CC|CCLD|C\+\+|CXX|CXXLD|LD|LINK)\]?\s+(.+?)$/
+ or $line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/
+ or $line =~ /^\s*[Bb]uilding (?:program|shared library)\s+(.+?)$/
or $line =~ /^\s*\[[\d ]+%\] Building (?:C|CXX) object (.+?)$/)) {
return 0;
}
+ # False positives.
+ #
+ # C++ compiler setting.
+ return 0 if $line =~ /^\s*C\+\+.+?:\s+(?:yes|no)\s*$/;
+ # "Compiling" with no file name.
+ if ($line =~ /^\s*[Cc]ompiling\s+(.+?)(?:\.\.\.)?$/) {
+ # $file_extension_regex may need spaces around the filename.
+ return 0 if not " $1 " =~ /$file_extension_regex/o;
+ }
+
my $file = $1;
# On the first pass we only check if this line is verbose or not.
if (defined $file) {
# Get filename, we can't use the complete path as only parts of it are
# used in the real compiler command.
- $file =~ m{/([a-zA-Z0-9._-]+)$};
+ $file =~ m{/([^/\s]+)$};
$file = $1;
- if ($next_line =~ /\Q$file\E/ and $next_line =~ /$cc_regex/o) {
+ if (index($next_line, $file) != -1 and $next_line =~ /$cc_regex/o) {
# We still have to skip the current line as it doesn't contain any
# compiler commands.
${$skip_ref} = 1;
return 1;
}
+sub remove_flags {
+ my ($flag_refs_ref, $flag_renames_ref, @flags) = @_;
+
+ my %removes = map { $_ => 1 } @flags;
+ foreach my $flags (@{$flag_refs_ref}) {
+ @{$flags} = grep {
+ # Flag found as string.
+ not exists $removes{$_}
+ # Flag found as string representation of regexp.
+ and (not defined $flag_renames_ref->{$_}
+ or not exists $removes{$flag_renames_ref->{$_}})
+ } @{$flags};
+ }
+}
+
+sub compile_flag_regexp {
+ my ($flag_renames_ref, @flags) = @_;
+
+ my @result = ();
+ foreach my $flag (@flags) {
+ # Store flag name in replacement string for correct flags in messages
+ # with qr//ed flag regexps.
+ $flag_renames_ref->{qr/\s$flag(?:\s|\\)/}
+ = (exists $flag_renames_ref->{$flag})
+ ? $flag_renames_ref->{$flag}
+ : $flag;
+
+ # Compile flag regexp for faster execution.
+ push @result, qr/\s$flag(?:\s|\\)/;
+ }
+ return @result;
+}
+
sub extension_found {
my ($extensions_ref, @extensions) = @_;
# MAIN
# Parse command line arguments.
-my $option_help = 0;
-my $option_version = 0;
-my $option_pie = 0;
-my $option_bindnow = 0;
-my $option_all = 0;
-my $option_arch = undef;
-my $option_buildd = 0;
- $option_color = 0;
+my $option_help = 0;
+my $option_version = 0;
+my $option_pie = 0;
+my $option_bindnow = 0;
+my @option_ignore_arch = ();
+my @option_ignore_flag = ();
+my @option_ignore_arch_flag = ();
+my @option_ignore_line = ();
+my @option_ignore_arch_line = ();
+my $option_all = 0;
+my $option_arch = undef;
+my $option_buildd = 0;
+ $option_color = 0;
if (not Getopt::Long::GetOptions(
- 'help|h|?' => \$option_help,
- 'version' => \$option_version,
+ 'help|h|?' => \$option_help,
+ 'version' => \$option_version,
# Hardening options.
- 'pie' => \$option_pie,
- 'bindnow' => \$option_bindnow,
- 'all' => \$option_all,
+ 'pie' => \$option_pie,
+ 'bindnow' => \$option_bindnow,
+ 'all' => \$option_all,
+ # Ignore.
+ 'ignore-arch=s' => \@option_ignore_arch,
+ 'ignore-flag=s' => \@option_ignore_flag,
+ 'ignore-arch-flag=s' => \@option_ignore_arch_flag,
+ 'ignore-line=s' => \@option_ignore_line,
+ 'ignore-arch-line=s' => \@option_ignore_arch_line,
# Misc.
- 'color' => \$option_color,
- 'arch=s' => \$option_arch,
- 'buildd' => \$option_buildd,
+ 'color' => \$option_color,
+ 'arch=s' => \$option_arch,
+ 'buildd' => \$option_buildd,
)) {
require Pod::Usage;
Pod::Usage::pod2usage(2);
exit 0;
}
+# Arguments missing.
+if (scalar @ARGV == 0) {
+ require Pod::Usage;
+ Pod::Usage::pod2usage(2);
+}
+
+# Don't load Term::ANSIColor in buildd mode because Term::ANSIColor is not
+# installed on Debian's buildds.
+if (not $option_buildd) {
+ require Term::ANSIColor;
+}
+
if ($option_all) {
$option_pie = 1;
$option_bindnow = 1;
}
+# Precompiled ignores for faster lookup.
+my %option_ignore_arch_flag = ();
+my %option_ignore_arch_line = ();
+
+# Strip flags which should be ignored.
+if (scalar @option_ignore_flag > 0) {
+ remove_flags(\@flag_refs, \%flag_renames, @option_ignore_flag);
+}
+# Same for arch specific ignore flags, but only prepare here.
+if (scalar @option_ignore_arch_flag > 0) {
+ foreach my $ignore (@option_ignore_arch_flag) {
+ my ($ignore_arch, $ignore_flag) = split ':', $ignore, 2;
+
+ if (not $ignore_arch or not $ignore_flag) {
+ printf STDERR 'Value "%s" invalid for option ignore-arch-flag '
+ . '("arch:flag" expected)' . "\n", $ignore;
+ require Pod::Usage;
+ Pod::Usage::pod2usage(2);
+ }
+
+ push @{$option_ignore_arch_flag{$ignore_arch}}, $ignore_flag;
+ }
+}
+
+# Precompile all flag regexps. any_flags_used(), all_flags_used() get a lot
+# faster with this.
+foreach my $flags (@flag_refs_all) {
+ @{$flags} = compile_flag_regexp(\%flag_renames, @{$flags});
+}
+
+# Precompile ignore line regexps, also anchor at beginning and end of line.
+foreach my $ignore (@option_ignore_line) {
+ $ignore = qr/^$ignore$/;
+}
+# Same for arch specific ignore lines.
+if (scalar @option_ignore_arch_line > 0) {
+ foreach my $ignore (@option_ignore_arch_line) {
+ my ($ignore_arch, $ignore_line) = split ':', $ignore, 2;
+
+ if (not $ignore_arch or not $ignore_line) {
+ printf STDERR 'Value "%s" invalid for option ignore-arch-line '
+ . '("arch:line" expected)' . "\n", $ignore;
+ require Pod::Usage;
+ Pod::Usage::pod2usage(2);
+ }
+
+ push @{$option_ignore_arch_line{$ignore_arch}}, qr/^$ignore_line$/;
+ }
+}
+
# Final exit code.
my $exit = 0;
-FILE: foreach my $file (@ARGV) {
- open my $fh, '<', $file or die "$!: $file";
+FILE:
+foreach my $file (@ARGV) {
+ print "checking '$file'...\n" if scalar @ARGV > 1;
+
+ open my $fh, '<', $file or die $!;
+
+ # Architecture of this file.
+ my $arch = $option_arch;
# Hardening options. Not all architectures support all hardening options.
my $harden_format = 1;
my $harden_bindnow = $option_bindnow; # defaults to 0
my $harden_pie = $option_pie; # defaults to 0
- # Input lines, contain only the lines with compiler commands.
- my @input = ();
-
- my $start = 0;
- my $continuation = 0;
- my $complete_line = undef;
while (my $line = <$fh>) {
- # dpkg-buildflags only provides hardening flags since 1.16.1, don't check
- # for hardening flags in buildd mode if an older dpkg-dev is used. Default
- # flags (-g -O2) are still checked.
+ # Detect architecture automatically unless overridden. For buildd logs
+ # only, doesn't use the dpkg-buildpackage header. Necessary to ignore
+ # build logs which aren't built (wrong architecture, build error,
+ # etc.).
+ if (not $arch
+ and $line =~ /^Architecture: (.+)$/) {
+ $arch = $1;
+ }
+
+ # dpkg-buildflags only provides hardening flags since 1.16.1, don't
+ # check for hardening flags in buildd mode if an older dpkg-dev is
+ # used. Default flags (-g -O2) are still checked.
#
# Packages which were built before 1.16.1 but used their own hardening
# flags are not checked.
- if ($option_buildd and not $start
- and $line =~ /^Toolchain package versions: /) {
+ if ($option_buildd
+ and index($line, 'Toolchain package versions: ') == 0) {
require Dpkg::Version;
- if ($line !~ /dpkg-dev_(\S+)/
+ if (not $line =~ /\bdpkg-dev_(\S+)/
or Dpkg::Version::version_compare($1, '1.16.1') < 0) {
$harden_format = 0;
$harden_fortify = 0;
}
}
+ # The following two versions of CMake in Debian obeyed CPPFLAGS, but
+ # this was later dropped because upstream rejected the patch. Thus
+ # build logs with these versions will have fortify hardening flags
+ # enabled, even though they may be not correctly set and are missing
+ # when build with later CMake versions. Thanks to Aron Xu for letting
+ # me know.
+ if (index($line, 'Package versions: ') == 0
+ and $line =~ /\bcmake_(\S+)/
+ and ($1 eq '2.8.7-1' or $1 eq '2.8.7-2')) {
+ if (not $option_buildd) {
+ error_invalid_cmake($1);
+ } else {
+ print "$buildd_tag{invalid_cmake} $1\n";
+ }
+ $exit |= $exit_code{invalid_cmake};
+ }
+
# If hardening wrapper is used (wraps calls to gcc and adds hardening
# flags automatically) we can't perform any checks, abort.
- if (not $start and $line =~ /^Build-Depends: .*\bhardening-wrapper\b/) {
- error_hardening_wrapper();
- $exit |= 1 << 4;
+ if (index($line, 'Build-Depends: ') == 0
+ and $line =~ /\bhardening-wrapper\b/) {
+ if (not $option_buildd) {
+ error_hardening_wrapper();
+ } else {
+ print "$buildd_tag{hardening_wrapper}\n";
+ }
+ $exit |= $exit_code{hardening_wrapper};
next FILE;
}
- # We skip over unimportant lines at the beginning of the log to prevent
- # false positives.
- $start = 1 if $line =~ /^dpkg-buildpackage:/;
- next if not $start;
- # And stop at the end of the build log. Package details (reported by the
- # buildd logs) are not important for us. This also prevents false
+ # We skip over unimportant lines at the beginning of the log to
+ # prevent false positives.
+ last if index($line, 'dpkg-buildpackage: ') == 0;
+ }
+
+ # Input lines, contain only the lines with compiler commands.
+ my @input = ();
+
+ my $continuation = 0;
+ my $complete_line = undef;
+ while (my $line = <$fh>) {
+ # And stop at the end of the build log. Package details (reported by
+ # the buildd logs) are not important for us. This also prevents false
# positives.
last if $line =~ /^Build finished at \d{8}-\d{4}$/;
# Detect architecture automatically unless overridden.
- if (not $option_arch
+ if (not $arch
and $line =~ /^dpkg-buildpackage: host architecture (.+)$/) {
- $option_arch = $1;
+ $arch = $1;
}
# Ignore compiler warnings for now.
next if $line =~ /$warning_regex/o;
- if ($line =~ /\033/) { # esc
+ if (not $option_buildd and index($line, "\033") != -1) { # esc
# Remove all ANSI color sequences which are sometimes used in
# non-verbose builds.
$line = Term::ANSIColor::colorstrip($line);
- # Also strip '\0xf' (delete previous character), used by Elinks' build
- # system.
+ # Also strip '\0xf' (delete previous character), used by Elinks'
+ # build system.
$line =~ s/\x0f//g;
- # And "ESC(B" which seems to be used on armhf and hurd (not sure what
- # it does).
+ # And "ESC(B" which seems to be used on armhf and hurd (not sure
+ # what it does).
$line =~ s/\033\(B//g;
}
# Check if this line indicates a non verbose build.
my $non_verbose = is_non_verbose_build($line);
- # One line may contain multiple commands (";"). Treat each one as single
- # line. parse_line() is slow, only use it when necessary.
- my @line = (not $line =~ /;/)
+ # One line may contain multiple commands (";"). Treat each one as
+ # single line. parse_line() is slow, only use it when necessary.
+ my @line = (index($line, ';') == -1)
? ($line)
: map {
- # Ensure newline at the line end - necessary for correct
- # parsing later.
+ # Ensure newline at the line end - necessary for
+ # correct parsing later.
$_ =~ s/\s+$//;
$_ .= "\n";
} Text::ParseWords::parse_line(';', 1, $line);
- foreach $line (@line) {
+ foreach my $line (@line) {
if ($continuation) {
$continuation = 0;
- # Join lines, but leave the "\" in place so it's clear where the
- # original line break was.
+ # Join lines, but leave the "\" in place so it's clear where
+ # the original line break was.
chomp $complete_line;
$complete_line .= ' ' . $line;
}
# Line continuation, line ends with "\".
- if ($line =~ /\\\s*$/) {
+ if ($line =~ /\\$/) {
$continuation = 1;
# Start line continuation.
if (not defined $complete_line) {
next;
}
- if (not $continuation) {
- # Use the complete line if a line continuation occurred.
- if (defined $complete_line) {
- $line = $complete_line;
- $complete_line = undef;
- }
-
- # Ignore lines with no compiler commands.
- next if $line !~ /\b$cc_regex(?:\s|\\)/o and not $non_verbose;
-
- # Ignore false positives.
- #
- # `./configure` output.
- next if not $non_verbose
- and $line =~ /^(?:checking|(?:C|c)onfigure:) /;
- next if $line =~ /^\s*(?:Host\s+)?(?:C\s+)?
- (?:C|c)ompiler[\s.]*:?\s+
- $cc_regex
- (?:\s-std=[a-z0-9:+]+)?\s*$
- /xo
- or $line =~ /^\s*(?:- )?(?:HOST_)?(?:CC|CXX)\s*=\s*$cc_regex\s*$/o
- or $line =~ /^\s*-- Check for working (?:C|CXX) compiler: /
- or $line =~ /^\s*(?:echo )?Using [A-Z_]+\s*=\s*/;
- # `make` output.
- next if $line =~ /^Making [a-z]+ in \S+/; # e.g. "[...] in c++"
-
- # Check if additional hardening options were used. Used to ensure
- # they are used for the complete build.
- $harden_pie = 1 if any_flags_used($line, @def_cflags_pie, @def_ldflags_pie);
- $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
-
- push @input, $line;
+ # Use the complete line if a line continuation occurred.
+ if (defined $complete_line) {
+ $line = $complete_line;
+ $complete_line = undef;
}
+
+ # Ignore lines with no compiler commands.
+ next if not $non_verbose
+ and not $line =~ /\b$cc_regex(?:\s|\\)/o;
+ # Ignore lines with no filenames with extensions. May miss some
+ # non-verbose builds (e.g. "gcc -o test" [sic!]), but shouldn't be
+ # a problem as the log will most likely contain other non-verbose
+ # commands which are detected.
+ next if not $non_verbose
+ and not $line =~ /$file_extension_regex/o;
+
+ # Ignore false positives.
+ #
+ # `./configure` output.
+ next if not $non_verbose
+ and $line =~ /^(?:checking|[Cc]onfigure:) /;
+ next if $line =~ /^\s*(?:Host\s+)?(?:C(?:\+\+)?\s+)?
+ [Cc]ompiler[\s.]*:?\s+
+ /xo;
+ next if $line =~ /^\s*(?:- )?(?:HOST_)?(?:CC|CXX)\s*=\s*$cc_regex_full\s*$/o;
+ # `moc-qt4`, contains '-I/usr/share/qt4/mkspecs/linux-g++' (or
+ # similar for other architectures) which gets recognized as a
+ # compiler line. Ignore it.
+ next if $line =~ m{^/usr/bin/moc-qt4
+ \s.+\s
+ -I/usr/share/qt4/mkspecs/[a-z]+-g\++(?:-64)?
+ \s}x;
+
+ # Check if additional hardening options were used. Used to ensure
+ # they are used for the complete build.
+ $harden_pie = 1 if any_flags_used($line, @def_cflags_pie,
+ @def_ldflags_pie);
+ $harden_bindnow = 1 if any_flags_used($line, @def_ldflags_bindnow);
+
+ push @input, $line;
}
}
- close $fh;
+ close $fh or die $!;
+
+ # Ignore arch if requested.
+ if (scalar @option_ignore_arch > 0 and $arch) {
+ foreach my $ignore (@option_ignore_arch) {
+ if ($arch eq $ignore) {
+ print "ignoring architecture '$arch'\n";
+ next FILE;
+ }
+ }
+ }
if (scalar @input == 0) {
- print "No compiler commands!\n";
- $exit |= 1;
+ if (not $option_buildd) {
+ print "No compiler commands!\n";
+ } else {
+ print "$buildd_tag{no_compiler_commands}\n";
+ }
+ $exit |= $exit_code{no_compiler_commands};
next FILE;
}
+ if ($option_buildd) {
+ $statistics{commands} += scalar @input;
+ }
+
# Option or auto detected.
- if ($option_arch) {
+ if ($arch) {
# The following was partially copied from dpkg-dev 1.16.1.2
# (/usr/share/perl5/Dpkg/Vendor/Debian.pm, add_hardening_flags()),
# copyright Raphaƫl Hertzog <hertzog@debian.org>, Kees Cook
# later. Keep it in sync.
require Dpkg::Arch;
- my ($abi, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($option_arch);
+ my ($abi, $os, $cpu) = Dpkg::Arch::debarch_to_debtriplet($arch);
# Disable unsupported hardening options.
- if ($cpu =~ /^(ia64|alpha|mips|mipsel|hppa)$/ or $option_arch eq 'arm') {
+ if ($cpu =~ /^(?:ia64|alpha|mips|mipsel|hppa)$/ or $arch eq 'arm') {
$harden_stack = 0;
}
- if ($cpu =~ /^(ia64|hppa|avr32)$/) {
+ if ($cpu =~ /^(?:ia64|hppa|avr32)$/) {
$harden_relro = 0;
$harden_bindnow = 0;
}
@ldflags = (@ldflags, @def_ldflags_bindnow);
}
+ # Ignore flags for this arch if requested.
+ if ($arch and exists $option_ignore_arch_flag{$arch}) {
+ my @flag_refs = (\@cflags, \@cxxflags, \@cppflags, \@ldflags);
+
+ remove_flags(\@flag_refs,
+ \%flag_renames,
+ @{$option_ignore_arch_flag{$arch}});
+ }
+
+ my @ignore_line = @option_ignore_line;
+ # Ignore lines for this arch if requested.
+ if ($arch and exists $option_ignore_arch_line{$arch}) {
+ @ignore_line = (@ignore_line, @{$option_ignore_arch_line{$arch}});
+ }
+
+LINE:
for (my $i = 0; $i < scalar @input; $i++) {
my $line = $input[$i];
+ # Ignore line if requested.
+ foreach my $ignore (@ignore_line) {
+ next LINE if $line =~ /$ignore/;
+ }
+
my $skip = 0;
if (is_non_verbose_build($line, $input[$i + 1], \$skip)) {
- error_non_verbose_build($line);
- $exit |= 1 << 2;
+ if (not $option_buildd) {
+ error_non_verbose_build($line);
+ } else {
+ $statistics{commands_nonverbose}++;
+ }
+ $exit |= $exit_code{non_verbose_build};
next;
}
# Even if it's a verbose build, we might have to skip this line.
next if $skip;
- # Remove everything until and including the compiler command. Makes checks
- # easier and faster.
+ # Remove everything until and including the compiler command. Makes
+ # checks easier and faster.
$line =~ s/^.*?$cc_regex//o;
+ # "([...] test.c)" is not detected as 'test.c' - fix this by removing
+ # the brace and similar characters.
+ $line =~ s/['")]+$//;
# Skip unnecessary tests when only preprocessing.
my $flag_preprocess = 0;
+ my $dependency = 0;
my $preprocess = 0;
my $compile = 0;
my $link = 0;
$preprocess = 1;
$flag_preprocess = 1 if $1 eq '-E';
$compile = 1 if $1 eq '-S' or $1 eq '-c';
+ # Dependency generation for Makefiles. The other flags (-MF -MG -MP
+ # -MT -MQ) are always used with -M/-MM.
+ } elsif ($line =~ /\s(?:-M|-MM)\b/) {
+ $dependency = 1;
# Otherwise assume we are linking.
} else {
$link = 1;
}
+ # -MD/-MMD also cause dependency generation, but they don't imply -E!
+ if ($line =~ /\s(?:-MD|-MMD)\b/) {
+ $dependency = 0;
+ $flag_preprocess = 0;
+ }
+
+ # Dependency generation for Makefiles, no preprocessing or other flags
+ # needed.
+ next if $dependency;
+
# Get all file extensions on this line.
my @extensions = $line =~ /$file_extension_regex/go;
# Ignore all unknown extensions to speedup the search below.
$preprocess = 1;
}
- # If there are source files then it's compiling/linking in one step and we
- # must check both. We only check for source files here, because header
- # files cause too many false positives.
+ # If there are source files then it's compiling/linking in one step
+ # and we must check both. We only check for source files here, because
+ # header files cause too many false positives.
if (not $flag_preprocess
and extension_found(\%extensions_compile_link, @extensions)) {
# Assembly files don't need CFLAGS.
$compile_cpp = 1;
}
+ if ($option_buildd) {
+ $statistics{preprocess}++ if $preprocess;
+ $statistics{compile}++ if $compile;
+ $statistics{compile_cpp}++ if $compile_cpp;
+ $statistics{link}++ if $link;
+ }
+
# Check hardening flags.
my @missing;
if ($compile and not all_flags_used($line, \@missing, @cflags)
- # Libraries linked with -fPIC don't have to (and can't) be linked
- # with -fPIE as well. It's no error if only PIE flags are missing.
+ # Libraries linked with -fPIC don't have to (and can't) be
+ # linked with -fPIE as well. It's no error if only PIE flags
+ # are missing.
and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
# Assume dpkg-buildflags returns the correct flags.
- and not $line =~ /`dpkg-buildflags --get CFLAGS`/) {
- error_flags('CFLAGS missing', \@missing, \%flag_renames, $input[$i]);
- $exit |= 1 << 3;
+ and index($line, '`dpkg-buildflags --get CFLAGS`') == -1) {
+ if (not $option_buildd) {
+ error_flags('CFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ } else {
+ $statistics{compile_missing}++;
+ }
+ $exit |= $exit_code{flags_missing};
} elsif ($compile_cpp and not all_flags_used($line, \@missing, @cflags)
- # Libraries linked with -fPIC don't have to (and can't) be linked
- # with -fPIE as well. It's no error if only PIE flags are missing.
+ # Libraries linked with -fPIC don't have to (and can't) be
+ # linked with -fPIE as well. It's no error if only PIE flags
+ # are missing.
and not pic_pie_conflict($line, $harden_pie, \@missing, @def_cflags_pie)
# Assume dpkg-buildflags returns the correct flags.
- and not $line =~ /`dpkg-buildflags --get CXXFLAGS`/) {
- error_flags('CXXFLAGS missing', \@missing, \%flag_renames, $input[$i]);
- $exit |= 1 << 3;
+ and index($line, '`dpkg-buildflags --get CXXFLAGS`') == -1) {
+ if (not $option_buildd) {
+ error_flags('CXXFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ } else {
+ $statistics{compile_cpp_missing}++;
+ }
+ $exit |= $exit_code{flags_missing};
}
- if ($preprocess and not all_flags_used($line, \@missing, @cppflags)
+ if ($preprocess
+ and (not all_flags_used($line, \@missing, @cppflags)
+ # The fortify flag might be overwritten, detect that.
+ or ($harden_fortify
+ and cppflags_fortify_broken($line, \@missing)))
# Assume dpkg-buildflags returns the correct flags.
- and not $line =~ /`dpkg-buildflags --get CPPFLAGS`/) {
- error_flags('CPPFLAGS missing', \@missing, \%flag_renames, $input[$i]);
- $exit |= 1 << 3;
+ and index($line, '`dpkg-buildflags --get CPPFLAGS`') == -1) {
+ if (not $option_buildd) {
+ error_flags('CPPFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ } else {
+ $statistics{preprocess_missing}++;
+ }
+ $exit |= $exit_code{flags_missing};
}
if ($link and not all_flags_used($line, \@missing, @ldflags)
# Same here, -fPIC conflicts with -fPIE.
and not pic_pie_conflict($line, $harden_pie, \@missing, @def_ldflags_pie)
# Assume dpkg-buildflags returns the correct flags.
- and not $line =~ /`dpkg-buildflags --get LDFLAGS`/) {
- error_flags('LDFLAGS missing', \@missing, \%flag_renames, $input[$i]);
- $exit |= 1 << 3;
+ and index($line, '`dpkg-buildflags --get LDFLAGS`') == -1) {
+ if (not $option_buildd) {
+ error_flags('LDFLAGS missing', \@missing, \%flag_renames, $input[$i]);
+ } else {
+ $statistics{link_missing}++;
+ }
+ $exit |= $exit_code{flags_missing};
}
}
}
+# Print statistics for buildd mode, only output in this mode.
+if ($option_buildd) {
+ my @warning;
+
+ if ($statistics{preprocess_missing}) {
+ push @warning, sprintf 'CPPFLAGS %d (of %d)',
+ $statistics{preprocess_missing},
+ $statistics{preprocess};
+ }
+ if ($statistics{compile_missing}) {
+ push @warning, sprintf 'CFLAGS %d (of %d)',
+ $statistics{compile_missing},
+ $statistics{compile};
+ }
+ if ($statistics{compile_cpp_missing}) {
+ push @warning, sprintf 'CXXFLAGS %d (of %d)',
+ $statistics{compile_cpp_missing},
+ $statistics{compile_cpp};
+ }
+ if ($statistics{link_missing}) {
+ push @warning, sprintf 'LDFLAGS %d (of %d)',
+ $statistics{link_missing},
+ $statistics{link};
+ }
+ if (scalar @warning) {
+ local $" = ', '; # array join string
+ print "$buildd_tag{flags_missing} @warning missing\n";
+ }
+
+ if ($statistics{commands_nonverbose}) {
+ printf "$buildd_tag{non_verbose_build} %d (of %d) hidden\n",
+ $statistics{commands_nonverbose},
+ $statistics{commands},
+ }
+}
+
+
exit $exit;
=head1 SYNOPSIS
-B<blhc> [options] <dpkg-buildpackage build log file>..
-
- --all force +all (+pie, +bindnow) check
- --arch set architecture (autodetected)
- --bindnow force +bindbow check
- --buildd parser mode for buildds
- --color use colored output
- --pie force +pie check
- --help available options
- --version version number and license
+B<blhc> [I<options>] I<< <dpkg-buildpackage build log file>.. >>
=head1 DESCRIPTION
-blhc is a small tool which checks build logs for missing hardening flags and
-other important warnings. It's licensed under the GPL 3 or later.
+blhc is a small tool which checks build logs for missing hardening flags. It's
+licensed under the GPL 3 or later.
+
+It's designed to check build logs generated by Debian's dpkg-buildpackage (or
+tools using dpkg-buildpackage like pbuilder or the official buildd build logs)
+to help maintainers detect missing hardening flags in their packages.
+
+If there's no output, no flags are missing and the build log is fine.
=head1 OPTIONS
Force check for all +all (+pie, +bindnow) hardening flags. By default it's
auto detected.
-=item B<--arch>
+=item B<--arch> I<architecture>
Set the specific architecture (e.g. amd64, armel, etc.), automatically
disables hardening flags not available on this architecture. Is detected
=over 2
-=item
+=item *
+
+Print tags instead of normal warnings, see L</"BUILDD TAGS"> for a list of
+possible tags.
+
+=item *
Don't check hardening flags in old log files (if dpkg-dev << 1.16.1 is
detected).
+=item *
+
+Don't require Term::ANSIColor.
+
=back
=item B<--color>
Use colored (ANSI) output for warning messages.
+=item B<--ignore-arch> I<arch>
+
+Ignore build logs from architectures matching I<arch>. I<arch> is a string.
+
+Used to prevent false positives. This option can be specified multiple times.
+
+=item B<--ignore-arch-flag> I<arch>:I<flag>
+
+Like B<--ignore-flag>, but only ignore flag on I<arch>.
+
+=item B<--ignore-arch-line> I<arch>:I<line>
+
+Like B<--ignore-line>, but only ignore line on I<arch>.
+
+=item B<--ignore-flag> I<flag>
+
+Don't print an error when the specific flag is missing in a compiler line.
+I<flag> is a string.
+
+Used to prevent false positives. This option can be specified multiple times.
+
+=item B<--ignore-line> I<regex>
+
+Ignore lines matching the given Perl regex. I<regex> is automatically anchored
+at the beginning and end of the line to prevent false negatives.
+
+B<NOTE>: Not the input lines are checked, but the lines which are displayed in
+warnings (which have line continuation resolved).
+
+Used to prevent false positives. This option can be specified multiple times.
+
=item B<--pie>
Force check for all +pie hardening flags. By default it's auto detected.
command uses the required hardening flag (e.g. -fPIE). Then it's required for
all other commands as well.
+=head1 EXAMPLES
+
+Normal usage, parse a single log file.
+
+ blhc path/to/log/file
+
+If there's no output, no flags are missing and the build log is fine.
+
+Parse multiple log files. The exit code is ORed over all files.
+
+ blhc path/to/directory/with/log/files/*
+
+Don't treat missing C<-g> as error:
+
+ blhc --ignore-flag -g path/to/log/file
+
+Don't treat missing C<-pie> on kfreebsd-amd64 as error:
+
+ blhc --ignore-arch-flag kfreebsd-amd64:-pie path/to/log/file
+
+Ignore lines consisting exactly of C<./script gcc file> which would cause a
+false positive.
+
+ blhc --ignore-line '\./script gcc file' path/to/log/file
+
+Ignore lines matching C<./script gcc file> somewhere in the line.
+
+ blhc --ignore-line '.*\./script gcc file.*' path/to/log/file
+
+Use blhc with pbuilder.
+
+ pbuilder path/to/package.dsc | tee path/log/file
+ blhc path/to/file || echo flags missing
+
+=head1 BUILDD TAGS
+
+The following tags are used in I<--buildd> mode. In braces the additional data
+which is displayed.
+
+=over 2
+
+=item B<I-hardening-wrapper-used>
+
+The package uses hardening-wrapper which intercepts calls to gcc and adds
+hardening flags. The build log doesn't contain any hardening flags and thus
+can't be checked by blhc.
+
+=item B<W-compiler-flags-hidden> (summary of hidden lines)
+
+Build log contains lines which hide the real compiler flags. For example:
+
+ CC test-a.c
+ CC test-b.c
+ CC test-c.c
+ LD test
+
+Most of the time either C<export V=1> or C<export verbose=1> in
+F<debian/rules> fixes builds with hidden compiler flags. Sometimes C<.SILENT>
+in a F<Makefile> must be removed. And as last resort the F<Makefile> must be
+patched to remove the C<@>s hiding the real compiler commands.
+
+=item B<W-dpkg-buildflags-missing> (summary of missing flags)
+
+CPPFLAGS, CFLAGS, CXXFLAGS, LDFLAGS missing.
+
+=item B<I-invalid-cmake-used> (version)
+
+By default CMake ignores CPPFLAGS thus missing those hardening flags. Debian
+patched CMake in versions 2.8.7-1 and 2.8.7-2 to respect CPPFLAGS, but this
+patch was rejected by upstream and later reverted in Debian. Thus those two
+versions show correct usage of CPPFLAGS even if the package doesn't correctly
+handle them (for example by passing them to CFLAGS). To prevent false
+negatives just blacklist those two versions.
+
+=item B<I-no-compiler-commands>
+
+No compiler commands were detected. Either the log contains none or they were
+not correctly detected by blhc (please report the bug in this case).
+
+=back
+
=head1 EXIT STATUS
The exit status is a "bit mask", each listed status is ORed when the error
Hardening wrapper detected, no tests performed.
+=item B<32>
+
+Invalid CMake version used. See B<I-invalid-cmake-used> under L</"BUILDD
+TAGS"> for a detailed explanation.
+
=back
=head1 AUTHOR
Simon Ruderich, E<lt>simon@ruderich.orgE<gt>
+Thanks to to Bernhard R. Link E<lt>brlink@debian.orgE<gt> and Jaria Alto
+E<lt>jari.aalto@cante.netE<gt> for their valuable input and suggestions.
+
=head1 COPYRIGHT AND LICENSE
Copyright (C) 2012 by Simon Ruderich
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
+=head1 SEE ALSO
+
+L<hardening-check(1)>, L<dpkg-buildflags(1)>
+
=cut