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wireshark/gtk/follow_ssl.c

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/* follow_ssl.c
* SSL specific routines for following traffic streams
*
* $Id$
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* 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.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <ctype.h>
#include <gtk/gtk.h>
#include <epan/follow.h>
#include <epan/dissectors/packet-ipv6.h>
#include <epan/prefs.h>
#include <epan/addr_resolv.h>
#include <epan/epan_dissect.h>
#include <epan/filesystem.h>
#include <epan/ipproto.h>
#include <epan/tap.h>
#include <../color.h>
#include <../globals.h>
#include <../alert_box.h>
#include <../simple_dialog.h>
#include <../util.h>
#include <gtk/color_utils.h>
#include <gtk/main.h>
#include <gtk/dlg_utils.h>
#include <gtk/file_dlg.h>
#include <gtk/keys.h>
#include <gtk/gui_utils.h>
#include <gtk/font_utils.h>
#include "gtk/follow_ssl.h"
#include "gtk/follow_stream.h"
#ifdef SSL_PLUGIN
#include "packet-ssl-utils.h"
#else
#include <epan/dissectors/packet-ssl-utils.h>
#endif
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;
COPY_ADDRESS(&follow_info->client_ip, &pinfo->src);
}
if (ADDRESSES_EQUAL(&follow_info->client_ip, &pinfo->src) &&
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->payload = g_list_append(
follow_info->payload,rec);
return 0;
}
extern gboolean
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
follow_ssl_stream_cb(GtkWidget * w, gpointer data _U_)
{
GtkWidget *filter_te;
gchar *follow_filter;
const gchar *previous_filter;
int filter_out_filter_len, previous_filter_len;
const char *hostname0, *hostname1;
char *port0, *port1;
gchar *server_to_client_string = NULL;
gchar *client_to_server_string = NULL;
gchar *both_directions_string = NULL;
follow_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 = g_object_get_data(G_OBJECT(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 ? */
previous_filter_len = previous_filter?strlen(previous_filter):0;
filter_out_filter_len = strlen(follow_filter) + previous_filter_len + 16;
follow_info->filter_out_filter = (gchar *)g_malloc(filter_out_filter_len);
/* append the negation */
if(previous_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);
remove_tap_listener(follow_info);
/* Stream to show */
follow_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.port[0]);
port1 = get_tcp_port(stats.port[1]);
follow_info->is_ipv6 = stats.is_ipv6;
/* Both Stream Directions */
both_directions_string = g_strdup_printf("Entire conversation (%u bytes)", follow_info->bytes_written[0] + follow_info->bytes_written[1]);
if(follow_info->client_port == stats.port[0]) {
server_to_client_string =
g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
hostname0, port0,
hostname1, port1,
follow_info->bytes_written[0]);
client_to_server_string =
g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
hostname1, port1,
hostname0, port0,
follow_info->bytes_written[1]);
} else {
server_to_client_string =
g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
hostname1, port1,
hostname0, port0,
follow_info->bytes_written[0]);
client_to_server_string =
g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
hostname0, port0,
hostname1, port1,
follow_info->bytes_written[1]);
}
follow_stream("Follow SSL Stream", follow_info, both_directions_string,
server_to_client_string, client_to_server_string);
g_free(both_directions_string);
g_free(server_to_client_string);
g_free(client_to_server_string);
}
#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 global_client_pos = 0, global_server_pos = 0;
guint32 server_packet_count = 0;
guint32 client_packet_count = 0;
guint32 *global_pos;
gboolean skip;
GList* cur;
frs_return_t frs_return;
iplen = (follow_info->is_ipv6) ? 16 : 4;
for (cur = follow_info->payload; 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;
gchar *buffer = g_memdup(rec->data.data, nchars);
frs_return = follow_show(follow_info, print_line, buffer, nchars,
rec->is_server, arg, global_pos,
&server_packet_count, &client_packet_count);
g_free(buffer);
if(frs_return == FRS_PRINT_ERROR)
return frs_return;
}
}
return FRS_OK;
}
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