2 * SSL specific routines for following traffic streams
6 * Wireshark - Network traffic analyzer
7 * By Gerald Combs <gerald@wireshark.org>
8 * Copyright 1998 Gerald Combs
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
41 #include <epan/follow.h>
42 #include <epan/dissectors/packet-ipv6.h>
43 #include <epan/prefs.h>
44 #include <epan/addr_resolv.h>
45 #include <epan/epan_dissect.h>
46 #include <epan/filesystem.h>
50 #include <../globals.h>
51 #include <../alert_box.h>
52 #include <../simple_dialog.h>
55 #include <gtk/color_utils.h>
57 #include <gtk/dlg_utils.h>
58 #include <gtk/file_dlg.h>
60 #include <gtk/gui_utils.h>
61 #include <gtk/font_utils.h>
62 #include "gtk/follow_ssl.h"
63 #include "gtk/follow_stream.h"
66 #include "packet-ssl-utils.h"
68 #include <epan/dissectors/packet-ssl-utils.h>
78 ssl_queue_packet_data(void *tapdata, packet_info *pinfo, epan_dissect_t *edt _U_, const void *ssl)
80 follow_info_t* follow_info = tapdata;
81 SslDecryptedRecord* rec;
82 SslDataInfo* appl_data;
85 int proto_ssl = (long) ssl;
86 SslPacketInfo* pi = p_get_proto_data(pinfo->fd, proto_ssl);
88 /* skip packet without decrypted data payload*/
89 if (!pi || !pi->appl_data)
92 /* compute total length */
94 appl_data = pi->appl_data;
96 total_len += appl_data->plain_data.data_len;
97 appl_data = appl_data->next;
100 /* compute packet direction */
101 rec = g_malloc(sizeof(SslDecryptedRecord) + total_len);
103 if (follow_info->client_port == 0) {
104 follow_info->client_port = pinfo->srcport;
105 COPY_ADDRESS(&follow_info->client_ip, &pinfo->src);
107 if (ADDRESSES_EQUAL(&follow_info->client_ip, &pinfo->src) &&
108 follow_info->client_port == pinfo->srcport)
113 /* update stream counter */
114 follow_info->bytes_written[rec->is_server] += total_len;
116 /* extract decrypted data and queue it locally */
117 rec->data.data = (guchar*)(rec + 1);
118 rec->data.data_len = total_len;
119 appl_data = pi->appl_data;
122 memcpy(p, appl_data->plain_data.data, appl_data->plain_data.data_len);
123 p += appl_data->plain_data.data_len;
124 appl_data = appl_data->next;
126 follow_info->payload = g_list_append(
127 follow_info->payload,rec);
133 packet_is_ssl(epan_dissect_t* edt);
136 /* Follow the SSL stream, if any, to which the last packet that we called
137 a dissection routine on belongs (this might be the most recently
138 selected packet, or it might be the last packet in the file). */
140 follow_ssl_stream_cb(GtkWidget * w, gpointer data _U_)
142 GtkWidget *filter_te;
143 gchar *follow_filter;
144 const gchar *previous_filter;
145 int filter_out_filter_len, previous_filter_len;
146 const char *hostname0, *hostname1;
148 gchar *server_to_client_string = NULL;
149 gchar *client_to_server_string = NULL;
150 gchar *both_directions_string = NULL;
151 follow_stats_t stats;
152 follow_info_t *follow_info;
155 /* we got ssl so we can follow */
156 if (!packet_is_ssl(cfile.edt)) {
157 simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
158 "Error following stream. Please make\n"
159 "sure you have an SSL packet selected.");
163 follow_info = g_new0(follow_info_t, 1);
164 follow_info->follow_type = FOLLOW_SSL;
166 /* Create a new filter that matches all packets in the SSL stream,
167 and set the display filter entry accordingly */
168 reset_tcp_reassembly();
169 follow_filter = build_follow_filter(&cfile.edt->pi);
172 simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
173 "Error creating filter for this stream.\n"
174 "A network layer header is needed");
179 /* Set the display filter entry accordingly */
180 filter_te = g_object_get_data(G_OBJECT(w), E_DFILTER_TE_KEY);
182 /* needed in follow_filter_out_stream(), is there a better way? */
183 follow_info->filter_te = filter_te;
185 /* save previous filter, const since we're not supposed to alter */
187 (const gchar *)gtk_entry_get_text(GTK_ENTRY(filter_te));
189 /* allocate our new filter. API claims g_malloc terminates program on failure */
190 /* my calc for max alloc needed is really +10 but when did a few extra bytes hurt ? */
191 previous_filter_len = previous_filter?(int)strlen(previous_filter):0;
192 filter_out_filter_len = (int)strlen(follow_filter) + previous_filter_len + 16;
193 follow_info->filter_out_filter = (gchar *)g_malloc(filter_out_filter_len);
195 /* append the negation */
196 if(previous_filter_len) {
197 g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
198 "%s and !(%s)", previous_filter, follow_filter);
200 g_snprintf(follow_info->filter_out_filter, filter_out_filter_len,
201 "!(%s)", follow_filter);
204 /* data will be passed via tap callback*/
205 msg = register_tap_listener("ssl", follow_info, follow_filter, 0,
206 NULL, ssl_queue_packet_data, NULL);
209 simple_dialog(ESD_TYPE_ERROR, ESD_BTN_OK,
210 "Can't register ssl tap: %s\n",msg->str);
211 g_free(follow_info->filter_out_filter);
213 g_free(follow_filter);
216 gtk_entry_set_text(GTK_ENTRY(filter_te), follow_filter);
218 /* Run the display filter so it goes in effect - even if it's the
219 same as the previous display filter. */
220 main_filter_packets(&cfile, follow_filter, TRUE);
222 /* Free the filter string, as we're done with it. */
223 g_free(follow_filter);
225 remove_tap_listener(follow_info);
228 follow_stats(&stats);
231 struct e_in6_addr ipaddr;
232 memcpy(&ipaddr, stats.ip_address[0], 16);
233 hostname0 = get_hostname6(&ipaddr);
234 memcpy(&ipaddr, stats.ip_address[0], 16);
235 hostname1 = get_hostname6(&ipaddr);
238 memcpy(&ipaddr, stats.ip_address[0], 4);
239 hostname0 = get_hostname(ipaddr);
240 memcpy(&ipaddr, stats.ip_address[1], 4);
241 hostname1 = get_hostname(ipaddr);
244 port0 = get_tcp_port(stats.port[0]);
245 port1 = get_tcp_port(stats.port[1]);
247 follow_info->is_ipv6 = stats.is_ipv6;
249 /* Both Stream Directions */
250 both_directions_string = g_strdup_printf("Entire conversation (%u bytes)", follow_info->bytes_written[0] + follow_info->bytes_written[1]);
252 if(follow_info->client_port == stats.port[0]) {
253 server_to_client_string =
254 g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
257 follow_info->bytes_written[0]);
259 client_to_server_string =
260 g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
263 follow_info->bytes_written[1]);
265 server_to_client_string =
266 g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
269 follow_info->bytes_written[0]);
271 client_to_server_string =
272 g_strdup_printf("%s:%s --> %s:%s (%u bytes)",
275 follow_info->bytes_written[1]);
278 follow_stream("Follow SSL Stream", follow_info, both_directions_string,
279 server_to_client_string, client_to_server_string);
281 g_free(both_directions_string);
282 g_free(server_to_client_string);
283 g_free(client_to_server_string);
286 #define FLT_BUF_SIZE 1024
289 * XXX - the routine pointed to by "print_line_fcn_p" doesn't get handed lines,
290 * it gets handed bufferfuls. That's fine for "follow_write_raw()"
291 * and "follow_add_to_gtk_text()", but, as "follow_print_text()" calls
292 * the "print_line()" routine from "print.c", and as that routine might
293 * genuinely expect to be handed a line (if, for example, it's using
294 * some OS or desktop environment's printing API, and that API expects
295 * to be handed lines), "follow_print_text()" should probably accumulate
296 * lines in a buffer and hand them "print_line()". (If there's a
297 * complete line in a buffer - i.e., there's nothing of the line in
298 * the previous buffer or the next buffer - it can just hand that to
299 * "print_line()" after filtering out non-printables, as an
302 * This might or might not be the reason why C arrays display
303 * correctly but get extra blank lines very other line when printed.
306 follow_read_ssl_stream(follow_info_t *follow_info,
307 gboolean (*print_line_fcn_p)(char *, size_t, gboolean, void *),
310 guint32 global_client_pos = 0, global_server_pos = 0;
311 guint32 server_packet_count = 0;
312 guint32 client_packet_count = 0;
316 frs_return_t frs_return;
318 for (cur = follow_info->payload; cur; cur = g_list_next(cur)) {
319 SslDecryptedRecord* rec = cur->data;
321 if (!rec->is_server) {
322 global_pos = &global_client_pos;
323 if (follow_info->show_stream == FROM_SERVER) {
327 global_pos = &global_server_pos;
328 if (follow_info->show_stream == FROM_CLIENT) {
334 size_t nchars = rec->data.data_len;
335 gchar *buffer = g_memdup(rec->data.data, (guint) nchars);
337 frs_return = follow_show(follow_info, print_line_fcn_p, buffer, nchars,
338 rec->is_server, arg, global_pos,
339 &server_packet_count, &client_packet_count);
341 if(frs_return == FRS_PRINT_ERROR)