347 lines
11 KiB
C
347 lines
11 KiB
C
/* follow_ssl.c
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* SSL specific routines for following traffic streams
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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* USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <string.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#include <ctype.h>
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#include <gtk/gtk.h>
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#include <epan/follow.h>
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#include <epan/dissectors/packet-ipv6.h>
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#include <epan/prefs.h>
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#include <epan/addr_resolv.h>
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#include <epan/epan_dissect.h>
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#include <epan/filesystem.h>
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#include <epan/tap.h>
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#include <ui/alert_box.h>
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#include <ui/simple_dialog.h>
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#include <ui/utf8_entities.h>
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#include <ui/util.h>
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#include "gtkglobals.h"
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#include "ui/gtk/color_utils.h"
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#include "ui/gtk/main.h"
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#include "ui/gtk/dlg_utils.h"
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#include "ui/gtk/file_dlg.h"
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#include "ui/gtk/keys.h"
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#include "ui/gtk/gui_utils.h"
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#include "ui/gtk/font_utils.h"
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#include "ui/gtk/follow_ssl.h"
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#include "ui/gtk/follow_stream.h"
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#ifdef SSL_PLUGIN
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#include "packet-ssl-utils.h"
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#else
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#include <epan/dissectors/packet-ssl-utils.h>
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#endif
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typedef struct {
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gboolean is_server;
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StringInfo data;
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} SslDecryptedRecord;
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static int
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ssl_queue_packet_data(void *tapdata, packet_info *pinfo, epan_dissect_t *edt _U_, const void *ssl)
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{
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follow_info_t* follow_info = (follow_info_t*)tapdata;
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SslDecryptedRecord* rec;
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SslDataInfo* appl_data;
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gint total_len;
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guchar *p;
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int proto_ssl = GPOINTER_TO_INT(ssl);
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SslPacketInfo* pi = (SslPacketInfo*)p_get_proto_data(pinfo->fd, proto_ssl);
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/* skip packet without decrypted data payload*/
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if (!pi || !pi->appl_data)
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return 0;
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/* compute total length */
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total_len = 0;
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appl_data = pi->appl_data;
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do {
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total_len += appl_data->plain_data.data_len;
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appl_data = appl_data->next;
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} while (appl_data);
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/* compute packet direction */
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rec = (SslDecryptedRecord*)g_malloc(sizeof(SslDecryptedRecord) + total_len);
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if (follow_info->client_port == 0) {
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follow_info->client_port = pinfo->srcport;
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COPY_ADDRESS(&follow_info->client_ip, &pinfo->src);
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}
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if (ADDRESSES_EQUAL(&follow_info->client_ip, &pinfo->src) &&
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follow_info->client_port == pinfo->srcport)
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rec->is_server = 0;
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else
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rec->is_server = 1;
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/* update stream counter */
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follow_info->bytes_written[rec->is_server] += total_len;
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/* extract decrypted data and queue it locally */
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rec->data.data = (guchar*)(rec + 1);
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rec->data.data_len = total_len;
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appl_data = pi->appl_data;
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p = rec->data.data;
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do {
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memcpy(p, appl_data->plain_data.data, appl_data->plain_data.data_len);
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p += appl_data->plain_data.data_len;
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appl_data = appl_data->next;
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} while (appl_data);
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follow_info->payload = g_list_append(
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follow_info->payload,rec);
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return 0;
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}
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extern gboolean
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packet_is_ssl(epan_dissect_t* edt);
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/* Follow the SSL stream, if any, to which the last packet that we called
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a dissection routine on belongs (this might be the most recently
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selected packet, or it might be the last packet in the file). */
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void
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follow_ssl_stream_cb(GtkWidget * w _U_, gpointer data _U_)
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{
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GtkWidget *filter_te, *filter_cm;
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gchar *follow_filter;
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const gchar *previous_filter;
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int filter_out_filter_len, previous_filter_len;
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const char *hostname0, *hostname1;
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char *port0, *port1;
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gchar *server_to_client_string = NULL;
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gchar *client_to_server_string = NULL;
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gchar *both_directions_string = NULL;
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follow_stats_t stats;
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follow_info_t *follow_info;
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GString* msg;
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/* we got ssl so we can follow */
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if (!packet_is_ssl(cfile.edt)) {
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Error following stream. Please make\n"
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"sure you have an SSL packet selected.");
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return;
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}
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follow_info = g_new0(follow_info_t, 1);
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follow_info->follow_type = FOLLOW_SSL;
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/* Create a new filter that matches all packets in the SSL stream,
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and set the display filter entry accordingly */
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reset_tcp_reassembly();
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follow_filter = build_follow_filter(&cfile.edt->pi);
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if (!follow_filter)
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{
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Error creating filter for this stream.\n"
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"A network layer header is needed");
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g_free(follow_info);
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return;
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}
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/* Set the display filter entry accordingly */
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filter_cm = (GtkWidget *)g_object_get_data(G_OBJECT(top_level), E_DFILTER_CM_KEY);
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filter_te = gtk_bin_get_child(GTK_BIN(filter_cm));
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/* needed in follow_filter_out_stream(), is there a better way? */
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follow_info->filter_te = filter_te;
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/* save previous filter, const since we're not supposed to alter */
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previous_filter =
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(const gchar *)gtk_entry_get_text(GTK_ENTRY(filter_te));
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/* allocate our new filter. API claims g_malloc terminates program on failure */
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/* my calc for max alloc needed is really +10 but when did a few extra bytes hurt ? */
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previous_filter_len = previous_filter?(int)strlen(previous_filter):0;
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filter_out_filter_len = (int)strlen(follow_filter) + previous_filter_len + 16;
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follow_info->filter_out_filter = (gchar *)g_malloc(filter_out_filter_len);
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/* append the negation */
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if(previous_filter_len) {
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g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
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"%s and !(%s)", previous_filter, follow_filter);
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} else {
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g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
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"!(%s)", follow_filter);
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}
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/* data will be passed via tap callback*/
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msg = register_tap_listener("ssl", follow_info, follow_filter, 0,
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NULL, ssl_queue_packet_data, NULL);
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if (msg)
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{
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simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
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"Can't register ssl tap: %s\n",msg->str);
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g_free(follow_info->filter_out_filter);
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g_free(follow_info);
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g_free(follow_filter);
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return;
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}
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gtk_entry_set_text(GTK_ENTRY(filter_te), follow_filter);
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/* Run the display filter so it goes in effect - even if it's the
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same as the previous display filter. */
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main_filter_packets(&cfile, follow_filter, TRUE);
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/* Free the filter string, as we're done with it. */
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g_free(follow_filter);
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remove_tap_listener(follow_info);
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/* Stream to show */
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follow_stats(&stats);
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if (stats.is_ipv6) {
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struct e_in6_addr ipaddr;
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memcpy(&ipaddr, stats.ip_address[0], 16);
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hostname0 = get_hostname6(&ipaddr);
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memcpy(&ipaddr, stats.ip_address[0], 16);
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hostname1 = get_hostname6(&ipaddr);
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} else {
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guint32 ipaddr;
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memcpy(&ipaddr, stats.ip_address[0], 4);
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hostname0 = get_hostname(ipaddr);
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memcpy(&ipaddr, stats.ip_address[1], 4);
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hostname1 = get_hostname(ipaddr);
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}
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port0 = get_tcp_port(stats.port[0]);
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port1 = get_tcp_port(stats.port[1]);
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follow_info->is_ipv6 = stats.is_ipv6;
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/* Both Stream Directions */
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both_directions_string = g_strdup_printf("Entire conversation (%u bytes)", follow_info->bytes_written[0] + follow_info->bytes_written[1]);
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if(follow_info->client_port == stats.port[0]) {
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server_to_client_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname0, port0,
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hostname1, port1,
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follow_info->bytes_written[0]);
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client_to_server_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname1, port1,
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hostname0, port0,
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follow_info->bytes_written[1]);
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} else {
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server_to_client_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname1, port1,
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hostname0, port0,
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follow_info->bytes_written[0]);
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client_to_server_string =
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g_strdup_printf("%s:%s " UTF8_RIGHTWARDS_ARROW " %s:%s (%u bytes)",
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hostname0, port0,
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hostname1, port1,
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follow_info->bytes_written[1]);
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}
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follow_stream("Follow SSL Stream", follow_info, both_directions_string,
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server_to_client_string, client_to_server_string);
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g_free(both_directions_string);
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g_free(server_to_client_string);
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g_free(client_to_server_string);
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}
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#define FLT_BUF_SIZE 1024
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/*
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* XXX - the routine pointed to by "print_line_fcn_p" doesn't get handed lines,
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* it gets handed bufferfuls. That's fine for "follow_write_raw()"
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* and "follow_add_to_gtk_text()", but, as "follow_print_text()" calls
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* the "print_line()" routine from "print.c", and as that routine might
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* genuinely expect to be handed a line (if, for example, it's using
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* some OS or desktop environment's printing API, and that API expects
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* to be handed lines), "follow_print_text()" should probably accumulate
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* lines in a buffer and hand them "print_line()". (If there's a
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* complete line in a buffer - i.e., there's nothing of the line in
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* the previous buffer or the next buffer - it can just hand that to
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* "print_line()" after filtering out non-printables, as an
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* optimization.)
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*
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* This might or might not be the reason why C arrays display
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* correctly but get extra blank lines very other line when printed.
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*/
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frs_return_t
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follow_read_ssl_stream(follow_info_t *follow_info,
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gboolean (*print_line_fcn_p)(char *, size_t, gboolean, void *),
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void *arg)
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{
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guint32 global_client_pos = 0, global_server_pos = 0;
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guint32 server_packet_count = 0;
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guint32 client_packet_count = 0;
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guint32 *global_pos;
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gboolean skip;
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GList* cur;
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frs_return_t frs_return;
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for (cur = follow_info->payload; cur; cur = g_list_next(cur)) {
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SslDecryptedRecord* rec = (SslDecryptedRecord*)cur->data;
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skip = FALSE;
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if (!rec->is_server) {
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global_pos = &global_client_pos;
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if (follow_info->show_stream == FROM_SERVER) {
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skip = TRUE;
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}
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} else {
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global_pos = &global_server_pos;
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if (follow_info->show_stream == FROM_CLIENT) {
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skip = TRUE;
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}
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}
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if (!skip) {
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size_t nchars = rec->data.data_len;
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gchar *buffer = (gchar *)g_memdup(rec->data.data, (guint) nchars);
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frs_return = follow_show(follow_info, print_line_fcn_p, buffer, nchars,
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rec->is_server, arg, global_pos,
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&server_packet_count, &client_packet_count);
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g_free(buffer);
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if(frs_return == FRS_PRINT_ERROR)
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return frs_return;
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}
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}
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return FRS_OK;
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}
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