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wireshark/gtk/ssl-dlg.c

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/* ssl_dlg.c
*
* $Id$
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <gtk/gtk.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <ctype.h>
#include <color.h>
#include <gtk/colors.h>
#include <gtk/main.h>
#include <epan/follow.h>
#include <gtk/dlg_utils.h>
#include <gtk/file_dlg.h>
#include <gtk/keys.h>
#include <globals.h>
#include <alert_box.h>
#include <simple_dialog.h>
#include <epan/dissectors/packet-ipv6.h>
#include <epan/prefs.h>
#include <epan/addr_resolv.h>
#include <epan/charsets.h>
#include <util.h>
#include <gtk/gui_utils.h>
#include <epan/epan_dissect.h>
#include <epan/filesystem.h>
#include <gtk/compat_macros.h>
#include <epan/ipproto.h>
#include <gtk/font_utils.h>
#include <wiretap/file_util.h>
#include <epan/tap.h>
#ifdef SSL_PLUGIN
#include "packet-ssl-utils.h"
#else
#include <epan/dissectors/packet-ssl-utils.h>
#endif
#include "ssl-dlg.h"
#include "follow_stream.h"
static void follow_destroy_cb(GtkWidget * win, gpointer data);
typedef struct {
gboolean is_server;
StringInfo data;
} SslDecryptedRecord;
static int
ssl_queue_packet_data(void *tapdata, packet_info *pinfo, epan_dissect_t *edt _U_, const void *ssl)
{
follow_info_t* follow_info = tapdata;
SslDecryptedRecord* rec;
SslDataInfo* appl_data;
gint total_len;
guchar *p;
int proto_ssl = (long) ssl;
SslPacketInfo* pi = p_get_proto_data(pinfo->fd, proto_ssl);
/* skip packet without decrypted data payload*/
if (!pi || !pi->appl_data)
return 0;
/* compute total length */
total_len = 0;
appl_data = pi->appl_data;
do {
total_len += appl_data->plain_data.data_len;
appl_data = appl_data->next;
} while (appl_data);
/* compute packet direction */
rec = g_malloc(sizeof(SslDecryptedRecord) + total_len);
if (follow_info->client_port == 0) {
follow_info->client_port = pinfo->srcport;
memcpy(follow_info->client_ip, pinfo->src.data, pinfo->src.len);
}
if (memcmp(follow_info->client_ip, pinfo->src.data, pinfo->src.len) == 0 &&
follow_info->client_port == pinfo->srcport) {
rec->is_server = 0;
}
else
rec->is_server = 1;
/* update stream counter */
follow_info->bytes_written[rec->is_server] += total_len;
/* extract decrypted data and queue it locally */
rec->data.data = (guchar*)(rec + 1);
rec->data.data_len = total_len;
appl_data = pi->appl_data;
p = rec->data.data;
do {
memcpy(p, appl_data->plain_data.data, appl_data->plain_data.data_len);
p += appl_data->plain_data.data_len;
appl_data = appl_data->next;
} while (appl_data);
follow_info->ssl_decrypted_data = g_list_append(
follow_info->ssl_decrypted_data,rec);
return 0;
}
extern int
packet_is_ssl(epan_dissect_t* edt);
/* Follow the SSL stream, if any, to which the last packet that we called
a dissection routine on belongs (this might be the most recently
selected packet, or it might be the last packet in the file). */
void
ssl_stream_cb(GtkWidget * w, gpointer data _U_)
{
GtkWidget *streamwindow, *vbox, *txt_scrollw, *text, *filter_te;
GtkWidget *hbox, *button_hbox, *button, *radio_bt;
GtkWidget *stream_fr, *stream_vb;
GtkWidget *stream_om, *stream_menu, *stream_mi;
GtkTooltips *tooltips;
gchar *follow_filter;
const gchar *previous_filter;
int filter_out_filter_len, previus_filter_len;
const char *hostname0, *hostname1;
char *port0, *port1;
char string[128];
follow_tcp_stats_t stats;
follow_info_t *follow_info;
GString* msg;
/* we got ssl so we can follow */
if (!packet_is_ssl(cfile.edt)) {
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"Error following stream. Please make\n"
"sure you have an SSL packet selected.");
return;
}
follow_info = g_new0(follow_info_t, 1);
follow_info->follow_type = FOLLOW_SSL;
/* Create a new filter that matches all packets in the SSL stream,
and set the display filter entry accordingly */
reset_tcp_reassembly();
follow_filter = build_follow_filter(&cfile.edt->pi);
if (!follow_filter)
{
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"Error creating filter for this stream.\n"
"A network layer header is needed");
return;
}
/* Set the display filter entry accordingly */
filter_te = OBJECT_GET_DATA(w, E_DFILTER_TE_KEY);
/* needed in follow_filter_out_stream(), is there a better way? */
follow_info->filter_te = filter_te;
/* save previous filter, const since we're not supposed to alter */
previous_filter =
(const gchar *)gtk_entry_get_text(GTK_ENTRY(filter_te));
/* allocate our new filter. API claims g_malloc terminates program on failure */
/* my calc for max alloc needed is really +10 but when did a few extra bytes hurt ? */
previus_filter_len = previous_filter?strlen(previous_filter):0;
filter_out_filter_len = strlen(follow_filter) + previus_filter_len + 16;
follow_info->filter_out_filter = (gchar *)g_malloc(filter_out_filter_len);
/* append the negation */
if(previus_filter_len) {
g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
"%s and !(%s)", previous_filter, follow_filter);
} else {
g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
"!(%s)", follow_filter);
}
/* data will be passed via tap callback*/
msg = register_tap_listener("ssl", follow_info, follow_filter,
NULL, ssl_queue_packet_data, NULL);
if (msg)
{
simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
"Can't register ssl tap: %s\n",msg->str);
return;
}
gtk_entry_set_text(GTK_ENTRY(filter_te), follow_filter);
/* Run the display filter so it goes in effect - even if it's the
same as the previous display filter. */
main_filter_packets(&cfile, follow_filter, TRUE);
/* Free the filter string, as we're done with it. */
g_free(follow_filter);
/* The data_out_file should now be full of the streams information */
remove_tap_listener(follow_info);
/* The data_out_filename file now has all the text that was in the session */
streamwindow = dlg_window_new("Follow SSL Stream");
/* needed in follow_filter_out_stream(), is there a better way? */
follow_info->streamwindow = streamwindow;
gtk_widget_set_name(streamwindow, "SSL stream window");
gtk_window_set_default_size(GTK_WINDOW(streamwindow), DEF_WIDTH, DEF_HEIGHT);
gtk_container_border_width(GTK_CONTAINER(streamwindow), 6);
/* setup the container */
tooltips = gtk_tooltips_new ();
vbox = gtk_vbox_new(FALSE, 6);
gtk_container_add(GTK_CONTAINER(streamwindow), vbox);
/* content frame */
if (incomplete_tcp_stream) {
stream_fr = gtk_frame_new("Stream Content (incomplete)");
} else {
stream_fr = gtk_frame_new("Stream Content");
}
gtk_container_add(GTK_CONTAINER(vbox), stream_fr);
gtk_widget_show(stream_fr);
stream_vb = gtk_vbox_new(FALSE, 6);
gtk_container_set_border_width( GTK_CONTAINER(stream_vb) , 6);
gtk_container_add(GTK_CONTAINER(stream_fr), stream_vb);
/* create a scrolled window for the text */
txt_scrollw = scrolled_window_new(NULL, NULL);
#if GTK_MAJOR_VERSION >= 2
gtk_scrolled_window_set_shadow_type(GTK_SCROLLED_WINDOW(txt_scrollw),
GTK_SHADOW_IN);
#endif
gtk_box_pack_start(GTK_BOX(stream_vb), txt_scrollw, TRUE, TRUE, 0);
/* create a text box */
#if GTK_MAJOR_VERSION < 2
text = gtk_text_new(NULL, NULL);
gtk_text_set_editable(GTK_TEXT(text), FALSE);
#else
text = gtk_text_view_new();
gtk_text_view_set_editable(GTK_TEXT_VIEW(text), FALSE);
#endif
gtk_container_add(GTK_CONTAINER(txt_scrollw), text);
follow_info->text = text;
/* stream hbox */
hbox = gtk_hbox_new(FALSE, 1);
gtk_box_pack_start(GTK_BOX(stream_vb), hbox, FALSE, FALSE, 0);
#if GTK_CHECK_VERSION(2,4,0)
/* Create Find Button */
button = BUTTON_NEW_FROM_STOCK(GTK_STOCK_FIND);
SIGNAL_CONNECT(button, "clicked", follow_find_cb, follow_info);
gtk_tooltips_set_tip (tooltips, button, "Find text in the displayed content", NULL);
gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 0);
#endif
/* Create Save As Button */
button = BUTTON_NEW_FROM_STOCK(GTK_STOCK_SAVE_AS);
SIGNAL_CONNECT(button, "clicked", follow_save_as_cmd_cb, follow_info);
gtk_tooltips_set_tip (tooltips, button, "Save the content as currently displayed ", NULL);
gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 0);
/* Stream to show */
follow_tcp_stats(&stats);
if (stats.is_ipv6) {
struct e_in6_addr ipaddr;
memcpy(&ipaddr, stats.ip_address[0], 16);
hostname0 = get_hostname6(&ipaddr);
memcpy(&ipaddr, stats.ip_address[0], 16);
hostname1 = get_hostname6(&ipaddr);
} else {
guint32 ipaddr;
memcpy(&ipaddr, stats.ip_address[0], 4);
hostname0 = get_hostname(ipaddr);
memcpy(&ipaddr, stats.ip_address[1], 4);
hostname1 = get_hostname(ipaddr);
}
port0 = get_tcp_port(stats.tcp_port[0]);
port1 = get_tcp_port(stats.tcp_port[1]);
follow_info->is_ipv6 = stats.is_ipv6;
stream_om = gtk_option_menu_new();
stream_menu = gtk_menu_new();
/* Both Stream Directions */
g_snprintf(string, sizeof(string),
"Entire conversation (%u bytes)",
follow_info->bytes_written[0] + follow_info->bytes_written[1]);
stream_mi = gtk_menu_item_new_with_label(string);
SIGNAL_CONNECT(stream_mi, "activate", follow_stream_om_both,
follow_info);
gtk_menu_append(GTK_MENU(stream_menu), stream_mi);
gtk_widget_show(stream_mi);
follow_info->show_stream = BOTH_HOSTS;
/* Host 0 --> Host 1 */
g_snprintf(string, sizeof(string), "%s:%s --> %s:%s (%u bytes)",
hostname0, port0, hostname1, port1,
follow_info->bytes_written[0]);
stream_mi = gtk_menu_item_new_with_label(string);
SIGNAL_CONNECT(stream_mi, "activate", follow_stream_om_client,
follow_info);
gtk_menu_append(GTK_MENU(stream_menu), stream_mi);
gtk_widget_show(stream_mi);
/* Host 1 --> Host 0 */
g_snprintf(string, sizeof(string), "%s:%s --> %s:%s (%u bytes)",
hostname1, port1, hostname0, port0,
follow_info->bytes_written[1]);
stream_mi = gtk_menu_item_new_with_label(string);
SIGNAL_CONNECT(stream_mi, "activate", follow_stream_om_server,
follow_info);
gtk_menu_append(GTK_MENU(stream_menu), stream_mi);
gtk_widget_show(stream_mi);
gtk_option_menu_set_menu(GTK_OPTION_MENU(stream_om), stream_menu);
/* Set history to 0th item, i.e., the first item. */
gtk_option_menu_set_history(GTK_OPTION_MENU(stream_om), 0);
gtk_tooltips_set_tip (tooltips, stream_om,
"Select the stream direction to display", NULL);
gtk_box_pack_start(GTK_BOX(hbox), stream_om, FALSE, FALSE, 0);
/* ASCII radio button */
radio_bt = gtk_radio_button_new_with_label(NULL, "ASCII");
gtk_tooltips_set_tip (tooltips, radio_bt, "Stream data output in \"ASCII\" format", NULL);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(radio_bt), TRUE);
gtk_box_pack_start(GTK_BOX(hbox), radio_bt, FALSE, FALSE, 0);
SIGNAL_CONNECT(radio_bt, "toggled", follow_charset_toggle_cb,
follow_info);
follow_info->ascii_bt = radio_bt;
follow_info->show_type = SHOW_ASCII;
/* HEX DUMP radio button */
radio_bt = gtk_radio_button_new_with_label(gtk_radio_button_group
(GTK_RADIO_BUTTON(radio_bt)),
"Hex Dump");
gtk_tooltips_set_tip (tooltips, radio_bt, "Stream data output in \"Hexdump\" format", NULL);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(radio_bt), FALSE);
gtk_box_pack_start(GTK_BOX(hbox), radio_bt, FALSE, FALSE, 0);
SIGNAL_CONNECT(radio_bt, "toggled", follow_charset_toggle_cb,
follow_info);
follow_info->hexdump_bt = radio_bt;
/* C Array radio button */
radio_bt = gtk_radio_button_new_with_label(gtk_radio_button_group
(GTK_RADIO_BUTTON(radio_bt)),
"C Arrays");
gtk_tooltips_set_tip (tooltips, radio_bt, "Stream data output in \"C Array\" format", NULL);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(radio_bt), FALSE);
gtk_box_pack_start(GTK_BOX(hbox), radio_bt, FALSE, FALSE, 0);
SIGNAL_CONNECT(radio_bt, "toggled", follow_charset_toggle_cb,
follow_info);
follow_info->carray_bt = radio_bt;
/* Raw radio button */
radio_bt = gtk_radio_button_new_with_label(gtk_radio_button_group
(GTK_RADIO_BUTTON(radio_bt)),
"Raw");
gtk_tooltips_set_tip (tooltips, radio_bt, "Stream data output in \"Raw\" (binary) format. "
"As this contains non printable characters, the screen output will be in ASCII format", NULL);
gtk_toggle_button_set_active(GTK_TOGGLE_BUTTON(radio_bt), FALSE);
gtk_box_pack_start(GTK_BOX(hbox), radio_bt, FALSE, FALSE, 0);
SIGNAL_CONNECT(radio_bt, "toggled", follow_charset_toggle_cb,
follow_info);
follow_info->raw_bt = radio_bt;
/* button hbox */
button_hbox = gtk_hbutton_box_new();
gtk_box_pack_start(GTK_BOX(vbox), button_hbox, FALSE, FALSE, 0);
gtk_button_box_set_layout (GTK_BUTTON_BOX(button_hbox), GTK_BUTTONBOX_END);
gtk_button_box_set_spacing(GTK_BUTTON_BOX(button_hbox), 5);
/* Create exclude stream button */
button = gtk_button_new_with_label("Filter Out This Stream");
SIGNAL_CONNECT(button, "clicked", follow_filter_out_stream, follow_info);
gtk_tooltips_set_tip (tooltips, button,
"Build a display filter which cuts this stream from the capture", NULL);
gtk_box_pack_start(GTK_BOX(button_hbox), button, FALSE, FALSE, 0);
/* Create Close Button */
button = BUTTON_NEW_FROM_STOCK(GTK_STOCK_CLOSE);
gtk_tooltips_set_tip (tooltips, button,
"Close the dialog and keep the current display filter", NULL);
gtk_box_pack_start(GTK_BOX(button_hbox), button, FALSE, FALSE, 0);
GTK_WIDGET_SET_FLAGS(button, GTK_CAN_DEFAULT);
window_set_cancel_button(streamwindow, button, window_cancel_button_cb);
/* Tuck away the follow_info object into the window */
OBJECT_SET_DATA(streamwindow, E_FOLLOW_INFO_KEY, follow_info);
follow_load_text(follow_info);
remember_follow_info(follow_info);
SIGNAL_CONNECT(streamwindow, "delete_event", window_delete_event_cb, NULL);
SIGNAL_CONNECT(streamwindow, "destroy", follow_destroy_cb, NULL);
/* Make sure this widget gets destroyed if we quit the main loop,
so that if we exit, we clean up any temporary files we have
for "Follow SSL Stream" windows. */
gtk_quit_add_destroy(gtk_main_level(), GTK_OBJECT(streamwindow));
gtk_widget_show_all(streamwindow);
window_present(streamwindow);
}
/* The destroy call back has the responsibility of
* unlinking the temporary file
* and freeing the filter_out_filter */
static void
follow_destroy_cb(GtkWidget *w, gpointer data _U_)
{
GList* cur;
follow_info_t *follow_info;
follow_info = OBJECT_GET_DATA(w, E_FOLLOW_INFO_KEY);
g_free(follow_info->filter_out_filter);
forget_follow_info(follow_info);
/* free decrypted data list*/
for (cur = follow_info->ssl_decrypted_data; cur; cur = g_list_next(cur))
if (cur->data)
{
g_free(cur->data);
cur->data = NULL;
}
g_list_free (follow_info->ssl_decrypted_data);
g_free(follow_info);
}
#define FLT_BUF_SIZE 1024
/*
* XXX - the routine pointed to by "print_line" doesn't get handed lines,
* it gets handed bufferfuls. That's fine for "follow_write_raw()"
* and "follow_add_to_gtk_text()", but, as "follow_print_text()" calls
* the "print_line()" routine from "print.c", and as that routine might
* genuinely expect to be handed a line (if, for example, it's using
* some OS or desktop environment's printing API, and that API expects
* to be handed lines), "follow_print_text()" should probably accumulate
* lines in a buffer and hand them "print_line()". (If there's a
* complete line in a buffer - i.e., there's nothing of the line in
* the previous buffer or the next buffer - it can just hand that to
* "print_line()" after filtering out non-printables, as an
* optimization.)
*
* This might or might not be the reason why C arrays display
* correctly but get extra blank lines very other line when printed.
*/
frs_return_t
follow_read_ssl_stream(follow_info_t *follow_info,
gboolean (*print_line)(char *, size_t, gboolean, void *),
void *arg)
{
int iplen;
guint32 current_pos, global_client_pos = 0, global_server_pos = 0;
guint32 *global_pos;
gboolean skip;
gchar initbuf[256];
guint32 server_packet_count = 0;
guint32 client_packet_count = 0;
static const gchar hexchars[16] = "0123456789abcdef";
GList* cur;
iplen = (follow_info->is_ipv6) ? 16 : 4;
for (cur = follow_info->ssl_decrypted_data; cur; cur = g_list_next(cur)) {
SslDecryptedRecord* rec = cur->data;
skip = FALSE;
if (!rec->is_server) {
global_pos = &global_client_pos;
if (follow_info->show_stream == FROM_SERVER) {
skip = TRUE;
}
}
else {
global_pos = &global_server_pos;
if (follow_info->show_stream == FROM_CLIENT) {
skip = TRUE;
}
}
if (!skip) {
size_t nchars = rec->data.data_len;
char* buffer = (char*) rec->data.data;
switch (follow_info->show_type) {
case SHOW_EBCDIC:
/* Not yet implemented in show SSL stream */
break;
case SHOW_ASCII:
/* If our native arch is EBCDIC, call:
* ASCII_TO_EBCDIC(buffer, nchars);
*/
if (!(*print_line) (buffer, nchars, rec->is_server, arg))
goto print_error;
break;
case SHOW_RAW:
/* Don't translate, no matter what the native arch
* is.
*/
if (!(*print_line) (buffer, nchars, rec->is_server, arg))
goto print_error;
break;
case SHOW_HEXDUMP:
current_pos = 0;
while (current_pos < nchars) {
gchar hexbuf[256];
int i;
gchar *cur = hexbuf, *ascii_start;
/* is_server indentation : put 78 spaces at the
* beginning of the string */
if (rec->is_server && follow_info->show_stream == BOTH_HOSTS) {
memset(cur, ' ', 78);
cur += 78;
}
cur += g_snprintf(cur, 20, "%08X ", *global_pos);
/* 49 is space consumed by hex chars */
ascii_start = cur + 49;
for (i = 0; i < 16 && current_pos + i < nchars; i++) {
*cur++ =
hexchars[(buffer[current_pos + i] & 0xf0) >> 4];
*cur++ =
hexchars[buffer[current_pos + i] & 0x0f];
*cur++ = ' ';
if (i == 7)
*cur++ = ' ';
}
/* Fill it up if column isn't complete */
while (cur < ascii_start)
*cur++ = ' ';
/* Now dump bytes as text */
for (i = 0; i < 16 && current_pos + i < nchars; i++) {
*cur++ =
(isprint((guchar)buffer[current_pos + i]) ?
buffer[current_pos + i] : '.' );
if (i == 7) {
*cur++ = ' ';
}
}
current_pos += i;
(*global_pos) += i;
*cur++ = '\n';
*cur = 0;
if (!(*print_line) (hexbuf, strlen(hexbuf), rec->is_server, arg))
goto print_error;
}
break;
case SHOW_CARRAY:
current_pos = 0;
g_snprintf(initbuf, sizeof(initbuf), "char peer%d_%d[] = {\n",
rec->is_server ? 1 : 0,
rec->is_server ? server_packet_count++ : client_packet_count++);
if (!(*print_line) (initbuf, strlen(initbuf), rec->is_server, arg))
goto print_error;
while (current_pos < nchars) {
gchar hexbuf[256];
int i, cur;
cur = 0;
for (i = 0; i < 8 && current_pos + i < nchars; i++) {
/* Prepend entries with "0x" */
hexbuf[cur++] = '0';
hexbuf[cur++] = 'x';
hexbuf[cur++] =
hexchars[(buffer[current_pos + i] & 0xf0) >> 4];
hexbuf[cur++] =
hexchars[buffer[current_pos + i] & 0x0f];
/* Delimit array entries with a comma */
if (current_pos + i + 1 < nchars)
hexbuf[cur++] = ',';
hexbuf[cur++] = ' ';
}
/* Terminate the array if we are at the end */
if (current_pos + i == nchars) {
hexbuf[cur++] = '}';
hexbuf[cur++] = ';';
}
current_pos += i;
(*global_pos) += i;
hexbuf[cur++] = '\n';
hexbuf[cur] = 0;
if (!(*print_line) (hexbuf, strlen(hexbuf), rec->is_server, arg))
goto print_error;
}
break;
}
}
}
return FRS_OK;
print_error:
return FRS_PRINT_ERROR;
}
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