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✏️ Editing: c_rehash Read Only

#!/usr/bin/perl

# Perl c_rehash script, scan all files in a directory
# and add symbolic links to their hash values.

my $dir = "/opt/cpanel/ea-openssl/etc/pki/tls";
my $prefix = "/opt/cpanel/ea-openssl";

my $openssl = $ENV{OPENSSL} || "openssl";
my $pwd;
my $x509hash = "-subject_hash";
my $crlhash = "-hash";
my $verbose = 0;
my $symlink_exists=eval {symlink("",""); 1};
my $removelinks = 1;

##  Parse flags.
while ( $ARGV[0] =~ /^-/ ) {
    my $flag = shift @ARGV;
    last if ( $flag eq '--');
    if ( $flag eq '-old') {
	    $x509hash = "-subject_hash_old";
	    $crlhash = "-hash_old";
    } elsif ( $flag eq '-h') {
	    help();
    } elsif ( $flag eq '-n' ) {
	    $removelinks = 0;
    } elsif ( $flag eq '-v' ) {
	    $verbose++;
    }
    else {
	    print STDERR "Usage error; try -help.\n";
	    exit 1;
    }
}

sub help {
	print "Usage: c_rehash [-old] [-h] [-v] [dirs...]\n";
	print "   -old use old-style digest\n";
	print "   -h print this help text\n";
	print "   -v print files removed and linked\n";
	exit 0;
}

eval "require Cwd";
if (defined(&Cwd::getcwd)) {
	$pwd=Cwd::getcwd();
} else {
	$pwd=`pwd`;
	chomp($pwd);
}

# DOS/Win32 or Unix delimiter?  Prefix our installdir, then search.
my $path_delim = ($pwd =~ /^[a-z]\:/i) ? ';' : ':';
$ENV{PATH} = "$prefix/bin" . ($ENV{PATH} ? $path_delim . $ENV{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;
	}
}

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;
}

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);
	closedir DIR;
	if ( $removelinks ) {
		# Delete any existing symbolic links
		foreach (grep {/^[\da-f]+\.r{0,1}\d+$/} @flist) {
			if(-l $_) {
				unlink $_;
				print "unlink $_" if $verbose;
			}
		}
	}
	FILE: foreach $fname (grep {/\.(pem)|(crt)|(cer)|(crl)$/} @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) if($cert);
		link_hash_crl($fname) 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

sub link_hash_cert {
		my $fname = $_[0];
		$fname =~ s/'/'\\''/g;
		my ($hash, $fprint) = `"$openssl" x509 $x509hash -fingerprint -noout -in "$fname"`;
		chomp $hash;
		chomp $fprint;
		$fprint =~ s/^.*=//;
		$fprint =~ tr/://d;
		my $suffix = 0;
		# Search for an unused hash filename
		while(exists $hashlist{"$hash.$suffix"}) {
			# Hash matches: if fingerprint matches its a duplicate cert
			if($hashlist{"$hash.$suffix"} eq $fprint) {
				print STDERR "WARNING: Skipping duplicate certificate $fname\n";
				return;
			}
			$suffix++;
		}
		$hash .= ".$suffix";
		if ($symlink_exists) {
			symlink $fname, $hash;
			print "link $fname -> $hash\n" if $verbose;
		} else {
			open IN,"<$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;
			print "copy $fname -> $hash\n" if $verbose;
		}
		$hashlist{$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];
		$fname =~ s/'/'\\''/g;
		my ($hash, $fprint) = `"$openssl" crl $crlhash -fingerprint -noout -in '$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";
		if ($symlink_exists) {
			symlink $fname, $hash;
			print "link $fname -> $hash\n" if $verbose;
		} else {
			system ("cp", $fname, $hash);
			print "cp $fname -> $hash\n" if $verbose;
		}
		$hashlist{$hash} = $fprint;
}

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