On 2013-02-19 at 15:37 +0100, Stephen Henson via RT wrote:
> The hash calculation (use by -CApath) changed from OpenSSL 0.9.8 to 1.0.0 and
> later. The two are not compatible. So you need to recreate hash links using
> OpenSSL 1.0.0.
I have systems where I need to use both the old and the new versions of
OpenSSL, so I use the attached version of c_rehash, which might help
Sushil Sharma.
I've added a detached PGP signature too.
An example use-case: MacOS, where the system ships with 0.9.8 but I have
1.0.1e from MacPorts, for various work I do. I can't break system
tools, I also need my stuff to work. So this version detects if OpenSSL
is "not version 0.something" and if so, uses -subject_hash_old and
creates both sets of symlinks.
A second example use-case: centrally managed certificate stores on disk,
which need to be used on machines with varying versions of OpenSSL
available.
-Phil
#!/usr/bin/env perl
use warnings;
use strict;
# Perl c_rehash script, scan all files in a directory
# and add symbolic links to their hash values.
my $openssl;
## Define this if you have a default certs dir on your system and it's not the
## "certs/" sub-dir of where OpenSSL is installed.
my $OVERRIDE_DEFAULT_CERT_DIR = undef;
#my $OVERRIDE_DEFAULT_CERT_DIR = '/etc/ssl/certs';
my $dir = "/usr/local/openssl";
my $prefix = "/usr/local";
if (exists $ENV{OPENSSL}) {
$openssl = $ENV{OPENSSL};
} else {
$openssl = "openssl";
## MacOS ships with pre-1 OpenSSL, and putting other versions ahead
## in $PATH might break system tools; we explicitly want to grab the
## MacPorts variant, without requiring $OPENSSL to be set in environ.
if ( -x "/opt/local/bin/openssl" and $^O eq "darwin" ) {
$openssl = "/opt/local/bin/openssl"
}
$ENV{OPENSSL} = $openssl;
}
if ((not exists $ENV{'SSL_CERT_DIR'}) and (defined $OVERRIDE_DEFAULT_CERT_DIR))
{
$ENV{'SSL_CERT_DIR'} = $OVERRIDE_DEFAULT_CERT_DIR;
}
my $pwd;
eval "require Cwd";
if (defined(&Cwd::getcwd)) {
$pwd=Cwd::getcwd();
} else {
$pwd=`pwd`; chomp($pwd);
}
my $path_delim = ($pwd =~ /^[a-z]\:/i) ? ';' : ':'; # DOS/Win32 or Unix
delimiter?
$ENV{PATH} = "$prefix/bin" . ($ENV{PATH} ? $path_delim . $ENV{PATH} : ""); #
prefix our path
if(! -x $openssl) {
my $found = 0;
foreach (split /$path_delim/, $ENV{PATH}) {
if(-x "$_/$openssl") {
$found = 1;
$openssl = "$_/$openssl";
last;
}
}
if($found == 0) {
print STDERR "c_rehash: rehashing skipped ('openssl' program
not available)\n";
exit 0;
}
}
my $have_openssl_1 = 0;
my $openssl_version;
if (`$openssl version` =~ /^OpenSSL\s+(\d\S+)/i) {
$openssl_version = $1;
unless ($openssl_version =~ /^0\./) {
$have_openssl_1 = 1;
}
}
my @dirlist;
if(@ARGV) {
@dirlist = @ARGV;
} elsif($ENV{SSL_CERT_DIR}) {
@dirlist = split /$path_delim/, $ENV{SSL_CERT_DIR};
} else {
$dirlist[0] = "$dir/certs";
}
if (-d $dirlist[0]) {
chdir $dirlist[0];
$openssl="$pwd/$openssl" if (!-x $openssl);
chdir $pwd;
}
# Might vary per FS; but define before we call funcs which rely upon it.
my $SYMLINK_EXISTS = eval {symlink("",""); 1};
foreach (@dirlist) {
if(-d $_ and -w $_) {
hash_dir($_);
}
}
sub hash_dir {
my %hashlist;
print "Doing $_[0]\n";
chdir $_[0];
opendir(DIR, ".");
my @flist = readdir(DIR);
# Delete any existing symbolic links
foreach (grep {/^[\da-f]+\.r{0,1}\d+$/} @flist) {
if(-l $_) {
unlink $_;
}
}
closedir DIR;
FILE: foreach my $fname (grep {/\.pem$/} @flist) {
# Check to see if certificates and/or CRLs present.
my ($cert, $crl) = check_file($fname);
if(!$cert && !$crl) {
print STDERR "WARNING: $fname does not contain a
certificate or CRL: skipping\n";
next;
}
link_hash_cert($fname, \%hashlist) if($cert);
link_hash_crl($fname, \%hashlist) if($crl);
}
}
sub check_file {
my ($is_cert, $is_crl) = (0,0);
my $fname = $_[0];
open IN, $fname;
while(<IN>) {
if(/^-----BEGIN (.*)-----/) {
my $hdr = $1;
if($hdr =~ /^(X509 |TRUSTED |)CERTIFICATE$/) {
$is_cert = 1;
last if($is_crl);
} elsif($hdr eq "X509 CRL") {
$is_crl = 1;
last if($is_cert);
}
}
}
close IN;
return ($is_cert, $is_crl);
}
# Link a certificate to its subject name hash value, each hash is of
# the form <hash>.<n> where n is an integer. If the hash value already exists
# then we need to up the value of n, unless its a duplicate in which
# case we skip the link. We check for duplicates by comparing the
# certificate fingerprints
# GlobNIX: note that OpenSSL changed hash algorithm in 1.0.0 but we need to
# support both apps linked against the system >=1.0.0 OpenSSL and those with
# their own library.
sub link_hash_cert {
my $fname = $_[0];
my $hashlist = $_[1];
$fname =~ s/'/'\\''/g;
my $x509_args = "-subject_hash -subject_hash_old -fingerprint -noout
-in";
my ($newhash, $oldhash, $fprint) = (undef, undef, undef);
unless ($have_openssl_1) {
$x509_args = "-subject_hash -fingerprint -noout -in";
}
my @x509_res = `"$openssl" x509 $x509_args "$fname"`;
if ($have_openssl_1) {
($newhash, $oldhash, $fprint) = @x509_res;
} else {
($newhash, $fprint) = @x509_res;
}
chomp $newhash;
chomp $oldhash if defined $oldhash;
chomp $fprint;
$fprint =~ s/^.*=//;
$fprint =~ tr/://d;
# Search for an unused hash filename
foreach my $hash ($newhash, $oldhash) {
next unless defined $hash;
my $suffix = 0;
while(exists $hashlist->{"$hash.$suffix"}) {
# Hash matches: if fingerprint matches its a duplicate
cert
if($hashlist->{"$hash.$suffix"} eq $fprint) {
print STDERR "WARNING: Skipping duplicate
certificate $fname\n";
return;
}
$suffix++;
}
$hash .= ".$suffix";
print "$fname => $hash\n";
if ($SYMLINK_EXISTS) {
symlink $fname, $hash;
} else {
open IN,"<$fname" or die "can't open $fname for read";
open OUT,">$hash" or die "can't open $hash for write";
print OUT <IN>; # does the job for small text files
close OUT;
close IN;
}
$hashlist->{$hash} = $fprint;
}
}
# Same as above except for a CRL. CRL links are of the form <hash>.r<n>
sub link_hash_crl {
my $fname = $_[0];
my $hashlist = $_[1];
$fname =~ s/'/'\\''/g;
my ($hash, $fprint) = `"$openssl" crl -hash -fingerprint -noout -in
'$fname'`;
chomp $hash;
chomp $fprint;
$fprint =~ s/^.*=//;
$fprint =~ tr/://d;
my $suffix = 0;
# Search for an unused hash filename
while(exists $hashlist->{"$hash.r$suffix"}) {
# Hash matches: if fingerprint matches its a duplicate cert
if($hashlist->{"$hash.r$suffix"} eq $fprint) {
print STDERR "WARNING: Skipping duplicate CRL $fname\n";
return;
}
$suffix++;
}
$hash .= ".r$suffix";
print "$fname => $hash\n";
if ($SYMLINK_EXISTS) {
symlink $fname, $hash;
} else {
system ("cp", $fname, $hash);
}
$hashlist->{$hash} = $fprint;
}
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DL8AoIOocyK8Jx2uspwHCk4ST0zvYBwu
=D+Nb
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