Display TLS connection information when connected to a TLS enabled server.

NEWS

@@ -23,6 +23,8 @@ v0.8.21-head 2016-xx-xx  The Irssi team <staff@irssi.org>
 	  to work.
 	+ Use TLS for Freenode, EFnet, EsperNet, OFTC, Rizon, and IRC6 in the default
 	  configuration.
+	+ Display TLS connection information upon connect. You can disable this by
+	  setting tls_verbose_connect to FALSE.
 	- IP addresses are no longer stored when resolve_reverse_lookup is
 	  used.
 	- /names and $[...] now uses utf8 string operations (#40, #411).

src/fe-common/core/Makefile.am

@@ -24,6 +24,7 @@ libfe_common_core_a_SOURCES = \
 	fe-queries.c \
 	fe-server.c \
 	fe-settings.c \
+	fe-tls.c \
 	formats.c \
 	hilight-text.c \
 	keyboard.c \
@@ -48,6 +49,7 @@ pkginc_fe_common_core_HEADERS = \
 	fe-exec.h \
 	fe-messages.h \
 	fe-queries.h \
+	fe-tls.h \
 	formats.h \
 	hilight-text.h \
 	keyboard.h \

src/fe-common/core/fe-common-core.c

@@ -88,6 +88,9 @@ void fe_server_deinit(void);
 void fe_settings_init(void);
 void fe_settings_deinit(void);
 
+void fe_tls_init(void);
+void fe_tls_deinit(void);
+
 void window_commands_init(void);
 void window_commands_deinit(void);
 
@@ -176,6 +179,7 @@ void fe_common_core_init(void)
 	fe_modules_init();
 	fe_server_init();
 	fe_settings_init();
+	fe_tls_init();
 	windows_init();
 	window_activity_init();
 	window_commands_init();
@@ -217,6 +221,7 @@ void fe_common_core_deinit(void)
 	fe_modules_deinit();
 	fe_server_deinit();
 	fe_settings_deinit();
+	fe_tls_deinit();
 	windows_deinit();
 	window_activity_deinit();
 	window_commands_deinit();

src/fe-common/core/fe-tls.c

@@ -0,0 +1,82 @@
+/*
+ * Copyright (c) 2015 Alexander Færøy <ahf@irssi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301,USA
+ */
+
+#include "module.h"
+#include "signals.h"
+#include "settings.h"
+#include "levels.h"
+#include "tls.h"
+
+#include "module-formats.h"
+#include "printtext.h"
+
+#include "fe-tls.h"
+
+static void tls_handshake_finished(SERVER_REC *server, TLS_REC *tls)
+{
+	if (! settings_get_bool("tls_verbose_connect"))
+		return;
+
+	printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_CERT_HEADER);
+
+	GSList *certs = NULL;
+	for (certs = tls->certs; certs != NULL; certs = certs->next) {
+		TLS_CERT_REC *tls_cert_rec = certs->data;
+
+		printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_CERT_SUBJECT_HEADER);
+
+		GSList *subject = NULL;
+		for (subject = tls_cert_rec->subject; subject != NULL; subject = subject->next) {
+			TLS_CERT_ENTRY_REC *subject_data = subject->data;
+			printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_CERT_NAMED_ENTRY, subject_data->name, subject_data->value);
+		}
+
+		printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_CERT_ISSUER_HEADER);
+
+		GSList *issuer = NULL;
+		for (issuer = tls_cert_rec->issuer; issuer != NULL; issuer = issuer->next) {
+			TLS_CERT_ENTRY_REC *issuer_data = issuer->data;
+			printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_CERT_NAMED_ENTRY, issuer_data->name, issuer_data->value);
+		}
+	}
+
+	printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_PROTOCOL_VERSION, tls->protocol_version, tls->cipher_size, tls->cipher);
+
+#ifdef SSL_get_server_tmp_key
+	if (tls->ephemeral_key_algorithm != NULL)
+		printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_EPHEMERAL_KEY, tls->ephemeral_key_size, tls->ephemeral_key_algorithm);
+	else
+		printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_EPHEMERAL_KEY_UNAVAILBLE);
+#endif
+
+	printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_PUBKEY, tls->public_key_size, tls->public_key_algorithm, tls->not_before, tls->not_after);
+	printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_PUBKEY_FINGERPRINT, tls->public_key_fingerprint, tls->public_key_fingerprint_algorithm);
+	printformat(server, NULL, MSGLEVEL_CLIENTNOTICE, TXT_TLS_CERT_FINGERPRINT, tls->certificate_fingerprint, tls->certificate_fingerprint_algorithm);
+}
+
+void fe_tls_init(void)
+{
+	settings_add_bool("lookandfeel", "tls_verbose_connect", TRUE);
+
+	signal_add("tls handshake finished", (SIGNAL_FUNC)tls_handshake_finished);
+}
+
+void fe_tls_deinit(void)
+{
+	signal_remove("tls handshake finished", (SIGNAL_FUNC)tls_handshake_finished);
+}

src/fe-common/core/fe-tls.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2015 Alexander Færøy <ahf@irssi.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 51
+ * Franklin Street, Fifth Floor, Boston, MA 02110-1301,USA
+ */
+
+#ifndef __FE_TLS_H
+#define __FE_TLS_H
+
+void fe_tls_init(void);
+void fe_tls_deinit(void);
+
+#endif

src/fe-common/core/module-formats.c

@@ -291,5 +291,19 @@ FORMAT_REC fecommon_core_formats[] = {
 	{ "completion_line", "%#$[10]0 $[!40]1 $2", 3, { 0, 0, 0 } },
 	{ "completion_footer", "", 0 },
 
+	/* ---- */
+	{ NULL, "TLS", 0 },
+
+	{ "tls_ephemeral_key", "EDH Key: {hilight $0} bit {hilight $1}", 2, { 1, 0 } },
+	{ "tls_ephemeral_key_unavailable", "EDH Key: {error N/A}", 0 },
+	{ "tls_pubkey",       "Public Key: {hilight $0} bit {hilight $1}, valid from {hilight $2} to {hilight $3}", 4, { 1, 0, 0, 0 } },
+	{ "tls_cert_header", "Certificate Chain:", 0 },
+	{ "tls_cert_subject_header", "  Subject:", 0 },
+	{ "tls_cert_issuer_header", "  Issuer:", 0 },
+	{ "tls_cert_named_entry", "    $[-2]0: {hilight $1}", 2, { 0, 0 } },
+	{ "tls_pubkey_fingerprint", "Public Key Fingerprint:  {hilight $0} ({hilight $1})", 2, { 0, 0 } },
+	{ "tls_cert_fingerprint", "Certificate Fingerprint: {hilight $0} ({hilight $1})", 2, { 0, 0 } },
+	{ "tls_protocol_version", "Protocol: {hilight $0} ({hilight $1} bit, {hilight $2})", 3, { 0, 1, 0 } },
+
 	{ NULL, NULL, 0 }
 };

src/fe-common/core/module-formats.h

@@ -254,7 +254,20 @@ enum {
         TXT_COMPLETION_REMOVED,
 	TXT_COMPLETION_HEADER,
         TXT_COMPLETION_LINE,
-	TXT_COMPLETION_FOOTER
+	TXT_COMPLETION_FOOTER,
+
+	TLS_FILL_15,
+
+	TXT_TLS_EPHEMERAL_KEY,
+	TXT_TLS_EPHEMERAL_KEY_UNAVAILBLE,
+	TXT_TLS_PUBKEY,
+	TXT_TLS_CERT_HEADER,
+	TXT_TLS_CERT_SUBJECT_HEADER,
+	TXT_TLS_CERT_ISSUER_HEADER,
+	TXT_TLS_CERT_NAMED_ENTRY,
+	TXT_TLS_PUBKEY_FINGERPRINT,
+	TXT_TLS_CERT_FINGERPRINT,
+	TXT_TLS_PROTOCOL_VERSION
 };
 
 extern FORMAT_REC fecommon_core_formats[];