send-email: be explicit with SSL certificate verification

When initiating an SSL connection without explicitly specifying the
SSL certificate verification mode, Net::SMTP::SSL defaults to no
verification, but recent versions of the module gives a warning
against this use of the default.

Enable certificate verification by default, using /etc/ssl/certs as
the default path for certificates of certificate authorities.  This
path can be overriden by the --smtp-ssl-cert-path command line
option and the sendemail.smtpSSLCertPath configuration variable.

Passing an empty string as the path for CA certificates path disables
the SSL certificate verification explicitly, which does not trigger
the warning from recent versions of Net::SMTP::SSL.

Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Helped-by: Brian M. Carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 38 insertions, 3 deletions

diff --git a/git-send-email.perl b/git-send-email.perl
index bd13cc812d..60eaed32ea 100755
--- a/git-send-email.perl
+++ b/git-send-email.perl
@@ -69,6 +69,9 @@ git send-email [options] <file | directory | rev-list options >
     --smtp-pass             <str>  * Password for SMTP-AUTH; not necessary.
     --smtp-encryption       <str>  * tls or ssl; anything else disables.
     --smtp-ssl                     * Deprecated. Use '--smtp-encryption ssl'.
+    --smtp-ssl-cert-path    <str>  * Path to ca-certificates (either directory or file).
+                                     Pass an empty string to disable certificate
+                                     verification.
     --smtp-domain           <str>  * The domain name sent to HELO/EHLO handshake
     --smtp-debug            <0|1>  * Disable, enable Net::SMTP debug.
 
@@ -194,7 +197,7 @@ sub do_edit {
 my ($thread, $chain_reply_to, $suppress_from, $signed_off_by_cc);
 my ($to_cmd, $cc_cmd);
 my ($smtp_server, $smtp_server_port, @smtp_server_options);
-my ($smtp_authuser, $smtp_encryption);
+my ($smtp_authuser, $smtp_encryption, $smtp_ssl_cert_path);
 my ($identity, $aliasfiletype, @alias_files, $smtp_domain);
 my ($validate, $confirm);
 my (@suppress_cc);
@@ -222,6 +225,7 @@ my %config_settings = (
     "smtpserveroption" => \@smtp_server_options,
     "smtpuser" => \$smtp_authuser,
     "smtppass" => \$smtp_authpass,
+    "smtpsslcertpath" => \$smtp_ssl_cert_path,
     "smtpdomain" => \$smtp_domain,
     "to" => \@initial_to,
     "tocmd" => \$to_cmd,
@@ -302,6 +306,7 @@ my $rc = GetOptions("h" => \$help,
 		    "smtp-pass:s" => \$smtp_authpass,
 		    "smtp-ssl" => sub { $smtp_encryption = 'ssl' },
 		    "smtp-encryption=s" => \$smtp_encryption,
+		    "smtp-ssl-cert-path" => \$smtp_ssl_cert_path,
 		    "smtp-debug:i" => \$debug_net_smtp,
 		    "smtp-domain:s" => \$smtp_domain,
 		    "identity=s" => \$identity,
@@ -1089,6 +1094,34 @@ sub smtp_auth_maybe {
 	return $auth;
 }
 
+sub ssl_verify_params {
+	eval {
+		require IO::Socket::SSL;
+		IO::Socket::SSL->import(qw/SSL_VERIFY_PEER SSL_VERIFY_NONE/);
+	};
+	if ($@) {
+		print STDERR "Not using SSL_VERIFY_PEER due to out-of-date IO::Socket::SSL.\n";
+		return;
+	}
+
+	if (!defined $smtp_ssl_cert_path) {
+		$smtp_ssl_cert_path = "/etc/ssl/certs";
+	}
+
+	if ($smtp_ssl_cert_path eq "") {
+		return (SSL_verify_mode => SSL_VERIFY_NONE());
+	} elsif (-d $smtp_ssl_cert_path) {
+		return (SSL_verify_mode => SSL_VERIFY_PEER(),
+			SSL_ca_path => $smtp_ssl_cert_path);
+	} elsif (-f $smtp_ssl_cert_path) {
+		return (SSL_verify_mode => SSL_VERIFY_PEER(),
+			SSL_ca_file => $smtp_ssl_cert_path);
+	} else {
+		print STDERR "Not using SSL_VERIFY_PEER because the CA path does not exist.\n";
+		return (SSL_verify_mode => SSL_VERIFY_NONE());
+	}
+}
+
 # Returns 1 if the message was sent, and 0 otherwise.
 # In actuality, the whole program dies when there
 # is an error sending a message.
@@ -1194,7 +1227,8 @@ X-Mailer: git-send-email $gitversion
 			$smtp_domain ||= maildomain();
 			$smtp ||= Net::SMTP::SSL->new($smtp_server,
 						      Hello => $smtp_domain,
-						      Port => $smtp_server_port);
+						      Port => $smtp_server_port,
+						      ssl_verify_params());
 		}
 		else {
 			require Net::SMTP;
@@ -1207,7 +1241,8 @@ X-Mailer: git-send-email $gitversion
 				$smtp->command('STARTTLS');
 				$smtp->response();
 				if ($smtp->code == 220) {
-					$smtp = Net::SMTP::SSL->start_SSL($smtp)
+					$smtp = Net::SMTP::SSL->start_SSL($smtp,
+									  ssl_verify_params())
 						or die "STARTTLS failed! ".$smtp->message;
 					$smtp_encryption = '';
 					# Send EHLO again to receive fresh