From cad0e125728658e4e899201e7cedc86036908057 Mon Sep 17 00:00:00 2001
From: Guilhem Moulin <guilhem@fripost.org>
Date: Wed, 16 Sep 2015 18:05:29 +0200
Subject: Display the certificate chain, SSL protocol and cipher in debug mode.
---
lib/Net/IMAP/InterIMAP.pm | 45 ++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 44 insertions(+), 1 deletion(-)
(limited to 'lib/Net')
diff --git a/lib/Net/IMAP/InterIMAP.pm b/lib/Net/IMAP/InterIMAP.pm
index 53fddec..f54f239 100644
--- a/lib/Net/IMAP/InterIMAP.pm
+++ b/lib/Net/IMAP/InterIMAP.pm
@@ -1364,6 +1364,35 @@ sub _proxify($$$$) {
}
+# $self->_ssl_verify($self, $preverify_ok, $x509_ctx)
+# SSL verify callback function, see
+# https://www.openssl.org/docs/manmaster/ssl/SSL_CTX_set_verify.html
+sub _ssl_verify($$$) {
+ my ($self, $ok, $x509_ctx) = @_;
+ return 0 unless $x509_ctx; # reject
+
+ my $depth = Net::SSLeay::X509_STORE_CTX_get_error_depth($x509_ctx);
+ my $cert = Net::SSLeay::X509_STORE_CTX_get_current_cert($x509_ctx)
+ or $self->_ssl_error("Can't get current certificate");
+ if ($self->{debug}) {
+ $self->log("[$depth] preverify=$ok");
+ $self->log(' Issuer Name: ', Net::SSLeay::X509_NAME_oneline(Net::SSLeay::X509_get_issuer_name($cert)));
+ $self->log(' Subject Name: ', Net::SSLeay::X509_NAME_oneline(Net::SSLeay::X509_get_subject_name($cert)));
+ }
+
+ if ($depth == 0) {
+ if ($self->{debug}) {
+ my $algo = 'sha256';
+ my $type = Net::SSLeay::EVP_get_digestbyname($algo)
+ or $self->_ssl_error("Can't find MD value for name '$algo'");
+ $self->log('Peer certificate fingerprint: '
+ .$algo.'$'.unpack('H*', Net::SSLeay::X509_digest($cert, $type)));
+ }
+ }
+ return $ok; # 1=accept cert, 0=reject
+}
+
+
# $self->_start_ssl($socket)
# Upgrade the $socket to SSL/TLS.
sub _start_ssl($$) {
@@ -1397,7 +1426,7 @@ sub _start_ssl($$) {
Net::SSLeay::CTX_load_verify_locations($ctx, $file, $path)
or $self->_ssl_error("Can't load verify locations");
}
- Net::SSLeay::CTX_set_verify($ctx, Net::SSLeay::VERIFY_PEER());
+ Net::SSLeay::CTX_set_verify($ctx, Net::SSLeay::VERIFY_PEER(), sub($$) {$self->_ssl_verify(@_)});
Net::SSLeay::CTX_set_purpose($ctx, Net::SSLeay::X509_PURPOSE_SSL_SERVER())
or $self->_ssl_error("Can't set purpose");
}
@@ -1409,6 +1438,20 @@ sub _start_ssl($$) {
Net::SSLeay::set_fd($ssl, fileno $socket) or $self->fail("SSL filehandle association failed");
$self->_ssl_error("Can't initiate TLS/SSL handshake") unless Net::SSLeay::connect($ssl) == 1;
+ if ($self->{debug}) {
+ my $v = Net::SSLeay::version($ssl);
+ $self->log(sprintf('SSL protocol: %s (0x%x)', ($v == 0x0002 ? 'SSLv2' :
+ $v == 0x0300 ? 'SSLv3' :
+ $v == 0x0301 ? 'TLSv1' :
+ $v == 0x0302 ? 'TLSv1.1' :
+ $v == 0x0303 ? 'TLSv1.2' :
+ '??'),
+ $v));
+ $self->log(sprintf('SSL cipher: %s (%d bits)'
+ , Net::SSLeay::get_cipher($ssl)
+ , Net::SSLeay::get_cipher_bits($ssl)));
+ }
+
if (defined (my $fpr = $self->{SSL_fingerprint})) {
# ensure we're talking to the right server
(my $algo, $fpr) = $fpr =~ /^([^\$]+)\$(.*)/ ? ($1, $2) : ('sha256', $fpr);
--
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