1#!/usr/local/bin/perl
2
3# Perl c_rehash script, scan all files in a directory
4# and add symbolic links to their hash values.
5
6my $dir;
7my $prefix;
8
9my $openssl = $ENV{OPENSSL} || "openssl";
10my $pwd;
11my $x509hash = "-subject_hash";
12my $crlhash = "-hash";
13my $verbose = 0;
14my $symlink_exists=eval {symlink("",""); 1};
15my $removelinks = 1;
16
17##  Parse flags.
18while ( $ARGV[0] =~ /^-/ ) {
19    my $flag = shift @ARGV;
20    last if ( $flag eq '--');
21    if ( $flag eq '-old') {
22	    $x509hash = "-subject_hash_old";
23	    $crlhash = "-hash_old";
24    } elsif ( $flag eq '-h') {
25	    help();
26    } elsif ( $flag eq '-n' ) {
27	    $removelinks = 0;
28    } elsif ( $flag eq '-v' ) {
29	    $verbose++;
30    }
31    else {
32	    print STDERR "Usage error; try -help.\n";
33	    exit 1;
34    }
35}
36
37sub help {
38	print "Usage: c_rehash [-old] [-h] [-v] [dirs...]\n";
39	print "   -old use old-style digest\n";
40	print "   -h print this help text\n";
41	print "   -v print files removed and linked\n";
42	exit 0;
43}
44
45eval "require Cwd";
46if (defined(&Cwd::getcwd)) {
47	$pwd=Cwd::getcwd();
48} else {
49	$pwd=`pwd`;
50	chomp($pwd);
51}
52
53# DOS/Win32 or Unix delimiter?  Prefix our installdir, then search.
54my $path_delim = ($pwd =~ /^[a-z]\:/i) ? ';' : ':';
55$ENV{PATH} = "$prefix/bin" . ($ENV{PATH} ? $path_delim . $ENV{PATH} : "");
56
57if(! -x $openssl) {
58	my $found = 0;
59	foreach (split /$path_delim/, $ENV{PATH}) {
60		if(-x "$_/$openssl") {
61			$found = 1;
62			$openssl = "$_/$openssl";
63			last;
64		}
65	}
66	if($found == 0) {
67		print STDERR "c_rehash: rehashing skipped ('openssl' program not available)\n";
68		exit 0;
69	}
70}
71
72if(@ARGV) {
73	@dirlist = @ARGV;
74} elsif($ENV{SSL_CERT_DIR}) {
75	@dirlist = split /$path_delim/, $ENV{SSL_CERT_DIR};
76} else {
77	$dirlist[0] = "$dir/certs";
78}
79
80if (-d $dirlist[0]) {
81	chdir $dirlist[0];
82	$openssl="$pwd/$openssl" if (!-x $openssl);
83	chdir $pwd;
84}
85
86foreach (@dirlist) {
87	if(-d $_ and -w $_) {
88		hash_dir($_);
89	}
90}
91
92sub hash_dir {
93	my %hashlist;
94	print "Doing $_[0]\n";
95	chdir $_[0];
96	opendir(DIR, ".");
97	my @flist = readdir(DIR);
98	closedir DIR;
99	if ( $removelinks ) {
100		# Delete any existing symbolic links
101		foreach (grep {/^[\da-f]+\.r{0,1}\d+$/} @flist) {
102			if(-l $_) {
103				unlink $_;
104				print "unlink $_" if $verbose;
105			}
106		}
107	}
108	FILE: foreach $fname (grep {/\.(pem)|(crt)|(cer)|(crl)$/} @flist) {
109		# Check to see if certificates and/or CRLs present.
110		my ($cert, $crl) = check_file($fname);
111		if(!$cert && !$crl) {
112			print STDERR "WARNING: $fname does not contain a certificate or CRL: skipping\n";
113			next;
114		}
115		link_hash_cert($fname) if($cert);
116		link_hash_crl($fname) if($crl);
117	}
118}
119
120sub check_file {
121	my ($is_cert, $is_crl) = (0,0);
122	my $fname = $_[0];
123	open IN, $fname;
124	while(<IN>) {
125		if(/^-----BEGIN (.*)-----/) {
126			my $hdr = $1;
127			if($hdr =~ /^(X509 |TRUSTED |)CERTIFICATE$/) {
128				$is_cert = 1;
129				last if($is_crl);
130			} elsif($hdr eq "X509 CRL") {
131				$is_crl = 1;
132				last if($is_cert);
133			}
134		}
135	}
136	close IN;
137	return ($is_cert, $is_crl);
138}
139
140
141# Link a certificate to its subject name hash value, each hash is of
142# the form <hash>.<n> where n is an integer. If the hash value already exists
143# then we need to up the value of n, unless its a duplicate in which
144# case we skip the link. We check for duplicates by comparing the
145# certificate fingerprints
146
147sub link_hash_cert {
148		my $fname = $_[0];
149		$fname =~ s/'/'\\''/g;
150		my ($hash, $fprint) = `"$openssl" x509 $x509hash -fingerprint -noout -in "$fname"`;
151		chomp $hash;
152		chomp $fprint;
153		$fprint =~ s/^.*=//;
154		$fprint =~ tr/://d;
155		my $suffix = 0;
156		# Search for an unused hash filename
157		while(exists $hashlist{"$hash.$suffix"}) {
158			# Hash matches: if fingerprint matches its a duplicate cert
159			if($hashlist{"$hash.$suffix"} eq $fprint) {
160				print STDERR "WARNING: Skipping duplicate certificate $fname\n";
161				return;
162			}
163			$suffix++;
164		}
165		$hash .= ".$suffix";
166		if ($symlink_exists) {
167			symlink $fname, $hash;
168			print "link $fname -> $hash\n" if $verbose;
169		} else {
170			open IN,"<$fname" or die "can't open $fname for read";
171			open OUT,">$hash" or die "can't open $hash for write";
172			print OUT <IN>;	# does the job for small text files
173			close OUT;
174			close IN;
175			print "copy $fname -> $hash\n" if $verbose;
176		}
177		$hashlist{$hash} = $fprint;
178}
179
180# Same as above except for a CRL. CRL links are of the form <hash>.r<n>
181
182sub link_hash_crl {
183		my $fname = $_[0];
184		$fname =~ s/'/'\\''/g;
185		my ($hash, $fprint) = `"$openssl" crl $crlhash -fingerprint -noout -in '$fname'`;
186		chomp $hash;
187		chomp $fprint;
188		$fprint =~ s/^.*=//;
189		$fprint =~ tr/://d;
190		my $suffix = 0;
191		# Search for an unused hash filename
192		while(exists $hashlist{"$hash.r$suffix"}) {
193			# Hash matches: if fingerprint matches its a duplicate cert
194			if($hashlist{"$hash.r$suffix"} eq $fprint) {
195				print STDERR "WARNING: Skipping duplicate CRL $fname\n";
196				return;
197			}
198			$suffix++;
199		}
200		$hash .= ".r$suffix";
201		if ($symlink_exists) {
202			symlink $fname, $hash;
203			print "link $fname -> $hash\n" if $verbose;
204		} else {
205			system ("cp", $fname, $hash);
206			print "cp $fname -> $hash\n" if $verbose;
207		}
208		$hashlist{$hash} = $fprint;
209}
210
211