1#!/usr/bin/perl
2
3
4# Perl c_rehash script, scan all files in a directory
5# and add symbolic links to their hash values.
6
7my $openssl;
8
9my $dir = "/usr/local/ssl";
10my $prefix = "/usr/local/ssl";
11
12if(defined $ENV{OPENSSL}) {
13	$openssl = $ENV{OPENSSL};
14} else {
15	$openssl = "openssl";
16	$ENV{OPENSSL} = $openssl;
17}
18
19my $pwd;
20eval "require Cwd";
21if (defined(&Cwd::getcwd)) {
22	$pwd=Cwd::getcwd();
23} else {
24	$pwd=`pwd`; chomp($pwd);
25}
26my $path_delim = ($pwd =~ /^[a-z]\:/i) ? ';' : ':'; # DOS/Win32 or Unix delimiter?
27
28$ENV{PATH} = "$prefix/bin" . ($ENV{PATH} ? $path_delim . $ENV{PATH} : ""); # prefix our path
29
30if(! -x $openssl) {
31	my $found = 0;
32	foreach (split /$path_delim/, $ENV{PATH}) {
33		if(-x "$_/$openssl") {
34			$found = 1;
35			$openssl = "$_/$openssl";
36			last;
37		}	
38	}
39	if($found == 0) {
40		print STDERR "c_rehash: rehashing skipped ('openssl' program not available)\n";
41		exit 0;
42	}
43}
44
45if(@ARGV) {
46	@dirlist = @ARGV;
47} elsif($ENV{SSL_CERT_DIR}) {
48	@dirlist = split /$path_delim/, $ENV{SSL_CERT_DIR};
49} else {
50	$dirlist[0] = "$dir/certs";
51}
52
53if (-d $dirlist[0]) {
54	chdir $dirlist[0];
55	$openssl="$pwd/$openssl" if (!-x $openssl);
56	chdir $pwd;
57}
58
59foreach (@dirlist) {
60	if(-d $_ and -w $_) {
61		hash_dir($_);
62	}
63}
64
65sub hash_dir {
66	my %hashlist;
67	print "Doing $_[0]\n";
68	chdir $_[0];
69	opendir(DIR, ".");
70	my @flist = readdir(DIR);
71	# Delete any existing symbolic links
72	foreach (grep {/^[\da-f]+\.r{0,1}\d+$/} @flist) {
73		if(-l $_) {
74			unlink $_;
75		}
76	}
77	closedir DIR;
78	FILE: foreach $fname (grep {/\.pem$/} @flist) {
79		# Check to see if certificates and/or CRLs present.
80		my ($cert, $crl) = check_file($fname);
81		if(!$cert && !$crl) {
82			print STDERR "WARNING: $fname does not contain a certificate or CRL: skipping\n";
83			next;
84		}
85		link_hash_cert($fname) if($cert);
86		link_hash_crl($fname) if($crl);
87	}
88}
89
90sub check_file {
91	my ($is_cert, $is_crl) = (0,0);
92	my $fname = $_[0];
93	open IN, $fname;
94	while(<IN>) {
95		if(/^-----BEGIN (.*)-----/) {
96			my $hdr = $1;
97			if($hdr =~ /^(X509 |TRUSTED |)CERTIFICATE$/) {
98				$is_cert = 1;
99				last if($is_crl);
100			} elsif($hdr eq "X509 CRL") {
101				$is_crl = 1;
102				last if($is_cert);
103			}
104		}
105	}
106	close IN;
107	return ($is_cert, $is_crl);
108}
109
110
111# Link a certificate to its subject name hash value, each hash is of
112# the form <hash>.<n> where n is an integer. If the hash value already exists
113# then we need to up the value of n, unless its a duplicate in which
114# case we skip the link. We check for duplicates by comparing the
115# certificate fingerprints
116
117sub link_hash_cert {
118		my $fname = $_[0];
119		$fname =~ s/'/'\\''/g;
120		my ($hash, $fprint) = `"$openssl" x509 -hash -fingerprint -noout -in "$fname"`;
121		chomp $hash;
122		chomp $fprint;
123		$fprint =~ s/^.*=//;
124		$fprint =~ tr/://d;
125		my $suffix = 0;
126		# Search for an unused hash filename
127		while(exists $hashlist{"$hash.$suffix"}) {
128			# Hash matches: if fingerprint matches its a duplicate cert
129			if($hashlist{"$hash.$suffix"} eq $fprint) {
130				print STDERR "WARNING: Skipping duplicate certificate $fname\n";
131				return;
132			}
133			$suffix++;
134		}
135		$hash .= ".$suffix";
136		print "$fname => $hash\n";
137		$symlink_exists=eval {symlink("",""); 1};
138		if ($symlink_exists) {
139			symlink $fname, $hash;
140		} else {
141			open IN,"<$fname" or die "can't open $fname for read";
142			open OUT,">$hash" or die "can't open $hash for write";
143			print OUT <IN>;	# does the job for small text files
144			close OUT;
145			close IN;
146		}
147		$hashlist{$hash} = $fprint;
148}
149
150# Same as above except for a CRL. CRL links are of the form <hash>.r<n>
151
152sub link_hash_crl {
153		my $fname = $_[0];
154		$fname =~ s/'/'\\''/g;
155		my ($hash, $fprint) = `"$openssl" crl -hash -fingerprint -noout -in '$fname'`;
156		chomp $hash;
157		chomp $fprint;
158		$fprint =~ s/^.*=//;
159		$fprint =~ tr/://d;
160		my $suffix = 0;
161		# Search for an unused hash filename
162		while(exists $hashlist{"$hash.r$suffix"}) {
163			# Hash matches: if fingerprint matches its a duplicate cert
164			if($hashlist{"$hash.r$suffix"} eq $fprint) {
165				print STDERR "WARNING: Skipping duplicate CRL $fname\n";
166				return;
167			}
168			$suffix++;
169		}
170		$hash .= ".r$suffix";
171		print "$fname => $hash\n";
172		$symlink_exists=eval {symlink("",""); 1};
173		if ($symlink_exists) {
174			symlink $fname, $hash;
175		} else {
176			system ("cp", $fname, $hash);
177		}
178		$hashlist{$hash} = $fprint;
179}
180
181