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From 9639817dac8bbbaa64d09efad7464ccc405527c7 Mon Sep 17 00:00:00 2001
From: Daniel Fiala <daniel@openssl.org>
Date: Sun, 29 May 2022 20:11:24 +0200
Subject: [PATCH] Fix file operations in c_rehash.
CVE-2022-2068
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>
Upstream-Status: Backport [https://github.com/openssl/openssl/commit/9639817dac8bbbaa64d09efad7464ccc405527c7]
---
tools/c_rehash.in | 216 +++++++++++++++++++++++-----------------------
1 file changed, 107 insertions(+), 109 deletions(-)
diff --git a/tools/c_rehash.in b/tools/c_rehash.in
index cfd18f5da110..9d2a6f6db73b 100644
--- a/tools/c_rehash.in
+++ b/tools/c_rehash.in
@@ -104,52 +104,78 @@ foreach (@dirlist) {
}
exit($errorcount);
+sub copy_file {
+ my ($src_fname, $dst_fname) = @_;
+
+ if (open(my $in, "<", $src_fname)) {
+ if (open(my $out, ">", $dst_fname)) {
+ print $out $_ while (<$in>);
+ close $out;
+ } else {
+ warn "Cannot open $dst_fname for write, $!";
+ }
+ close $in;
+ } else {
+ warn "Cannot open $src_fname for read, $!";
+ }
+}
+
sub hash_dir {
- my %hashlist;
- print "Doing $_[0]\n";
- chdir $_[0];
- opendir(DIR, ".");
- my @flist = sort readdir(DIR);
- closedir DIR;
- if ( $removelinks ) {
- # Delete any existing symbolic links
- foreach (grep {/^[\da-f]+\.r{0,1}\d+$/} @flist) {
- if (-l $_) {
- print "unlink $_" if $verbose;
- unlink $_ || warn "Can't unlink $_, $!\n";
- }
- }
- }
- 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);
- }
+ my $dir = shift;
+ my %hashlist;
+
+ print "Doing $dir\n";
+
+ if (!chdir $dir) {
+ print STDERR "WARNING: Cannot chdir to '$dir', $!\n";
+ return;
+ }
+
+ opendir(DIR, ".") || print STDERR "WARNING: Cannot opendir '.', $!\n";
+ my @flist = sort readdir(DIR);
+ closedir DIR;
+ if ( $removelinks ) {
+ # Delete any existing symbolic links
+ foreach (grep {/^[\da-f]+\.r{0,1}\d+$/} @flist) {
+ if (-l $_) {
+ print "unlink $_\n" if $verbose;
+ unlink $_ || warn "Can't unlink $_, $!\n";
+ }
+ }
+ }
+ 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);
+ }
+
+ chdir $pwd;
}
sub check_file {
- my ($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, $is_crl);
+ my ($is_cert, $is_crl) = (0,0);
+ my $fname = $_[0];
+
+ open(my $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);
}
sub compute_hash {
@@ -177,76 +203,48 @@ sub compute_hash {
# certificate fingerprints
sub link_hash_cert {
- my $fname = $_[0];
- my ($hash, $fprint) = compute_hash($openssl, "x509", $x509hash,
- "-fingerprint", "-noout",
- "-in", $fname);
- chomp $hash;
- chomp $fprint;
- return if !$hash;
- $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) {
- print "link $fname -> $hash\n" if $verbose;
- symlink $fname, $hash || warn "Can't symlink, $!";
- } else {
- print "copy $fname -> $hash\n" if $verbose;
- if (open($in, "<", $fname)) {
- if (open($out,">", $hash)) {
- print $out $_ while (<$in>);
- close $out;
- } else {
- warn "can't open $hash for write, $!";
- }
- close $in;
- } else {
- warn "can't open $fname for read, $!";
- }
- }
- $hashlist{$hash} = $fprint;
+ link_hash($_[0], 'cert');
}
# Same as above except for a CRL. CRL links are of the form <hash>.r<n>
sub link_hash_crl {
- my $fname = $_[0];
- my ($hash, $fprint) = compute_hash($openssl, "crl", $crlhash,
- "-fingerprint", "-noout",
- "-in", $fname);
- chomp $hash;
- chomp $fprint;
- return if !$hash;
- $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) {
- print "link $fname -> $hash\n" if $verbose;
- symlink $fname, $hash || warn "Can't symlink, $!";
- } else {
- print "cp $fname -> $hash\n" if $verbose;
- system ("cp", $fname, $hash);
- warn "Can't copy, $!" if ($? >> 8) != 0;
- }
- $hashlist{$hash} = $fprint;
+ link_hash($_[0], 'crl');
+}
+
+sub link_hash {
+ my ($fname, $type) = @_;
+ my $is_cert = $type eq 'cert';
+
+ my ($hash, $fprint) = compute_hash($openssl,
+ $is_cert ? "x509" : "crl",
+ $is_cert ? $x509hash : $crlhash,
+ "-fingerprint", "-noout",
+ "-in", $fname);
+ chomp $hash;
+ chomp $fprint;
+ return if !$hash;
+ $fprint =~ s/^.*=//;
+ $fprint =~ tr/://d;
+ my $suffix = 0;
+ # Search for an unused hash filename
+ my $crlmark = $is_cert ? "" : "r";
+ while(exists $hashlist{"$hash.$crlmark$suffix"}) {
+ # Hash matches: if fingerprint matches its a duplicate cert
+ if ($hashlist{"$hash.$crlmark$suffix"} eq $fprint) {
+ my $what = $is_cert ? 'certificate' : 'CRL';
+ print STDERR "WARNING: Skipping duplicate $what $fname\n";
+ return;
+ }
+ $suffix++;
+ }
+ $hash .= ".$crlmark$suffix";
+ if ($symlink_exists) {
+ print "link $fname -> $hash\n" if $verbose;
+ symlink $fname, $hash || warn "Can't symlink, $!";
+ } else {
+ print "copy $fname -> $hash\n" if $verbose;
+ copy_file($fname, $hash);
+ }
+ $hashlist{$hash} = $fprint;
}
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