1 /* packet-wifi-dpp.c
2 *
3 * Wi-Fi Device Provisioning Protocol (DPP)
4 *
5 * Copyright 2017-2020 Richard Sharpe <realrichardsharpe@gmail.com>
6 * Copyright 2017-2020 The WiFi Alliance
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11 /*
12 * Code and constants based on Device_Provisioning_Protocol_Specification_v1.2.9
13 */
14
15 #include "config.h"
16
17 #include <epan/packet.h>
18 #include "packet-tcp.h"
19 #include <epan/to_str.h>
20 #include <epan/expert.h>
21
22 #include "packet-wifi-dpp.h"
23 #include "packet-ieee80211.h"
24
25 extern const value_string wfa_subtype_vals[];
26
27 void proto_register_wifi_dpp(void);
28 void proto_reg_handoff_wifi_dpp(void);
29
30 #define WIFI_DPP_TCP_PORT (7871)
31 static guint wifi_dpp_tcp_port = WIFI_DPP_TCP_PORT;
32
33 enum {
34 DPP_STATUS_OK = 0,
35 DPP_STATUS_NOT_COMPATIBLE = 1,
36 DPP_STATUS_AUTH_FAILURE = 2,
37 DPP_STATUS_UNWRAP_FAILURE = 3,
38 DPP_STATUS_BAD_GROUP = 4,
39 DPP_STATUS_CONFIGURE_FAILURE = 5,
40 DPP_STATUS_RESPONSE_PENDING = 6,
41 DPP_STATUS_INVALID_CONNECTOR = 7,
42 DPP_STATUS_NO_MATCH = 8,
43 DPP_STATUS_CONFIG_REJECTED = 9,
44 DPP_STATUS_NO_AP = 10,
45 DPP_STATUS_CONFIGURE_PENDING = 11,
46 DPP_STATUS_CSR_NEEDED = 12,
47 DPP_STATUS_CSR_BAD = 13
48 };
49
50 static const value_string dpp_status_codes[] = {
51 { DPP_STATUS_OK, "OK" },
52 { DPP_STATUS_NOT_COMPATIBLE, "Not Compatible" },
53 { DPP_STATUS_AUTH_FAILURE, "Auth Failure" },
54 { DPP_STATUS_UNWRAP_FAILURE, "Unwrap Failure" },
55 { DPP_STATUS_BAD_GROUP, "Bad Group" },
56 { DPP_STATUS_CONFIGURE_FAILURE, "Configure Failure" },
57 { DPP_STATUS_RESPONSE_PENDING, "Response Pending" },
58 { DPP_STATUS_INVALID_CONNECTOR, "Invalid Connector" },
59 { DPP_STATUS_NO_MATCH, "No Match" },
60 { DPP_STATUS_CONFIG_REJECTED, "Enrollee rejected the config" },
61 { DPP_STATUS_NO_AP, "Enrollee failed to discover an AP" },
62 { DPP_STATUS_CONFIGURE_PENDING, "Configuration response is not ready yet. The enrollee needs to request again." },
63 { DPP_STATUS_CSR_NEEDED, "Configuration requires a Certificate Signing Request. Enrollee needs to request again." },
64 { DPP_STATUS_CSR_BAD, "The Certificate Signing Request was invalid." },
65 { DPP_STATUS_OK, "OK" },
66 { DPP_STATUS_NOT_COMPATIBLE, "Not Compatible" },
67 { DPP_STATUS_AUTH_FAILURE, "Auth Failure" },
68 { DPP_STATUS_UNWRAP_FAILURE, "Unwrap Failure" },
69 { DPP_STATUS_BAD_GROUP, "Bad Group" },
70 { DPP_STATUS_CONFIGURE_FAILURE, "Configure Failure" },
71 { DPP_STATUS_RESPONSE_PENDING, "Response Pending" },
72 { 0, NULL }
73 };
74
75 enum {
76 DPP_STATUS = 0x1000,
77 DPP_INITIATOR_BOOTSTRAPPING_KEY_HASH = 0x1001,
78 DPP_RESPONDER_BOOTSTRAPPING_KEY_HASH = 0x1002,
79 DPP_INITIATOR_PROTOCOL_KEY = 0x1003,
80 DPP_WRAPPED_DATA = 0x1004,
81 DPP_INITIATOR_NONCE = 0x1005,
82 DPP_INITIATOR_CAPABILITIES = 0x1006,
83 DPP_RESPONDER_NONCE = 0x1007,
84 DPP_RESPONDER_CAPABILITIES = 0x1008,
85 DPP_RESPONDER_PROTOCOL_KEY = 0x1009,
86 DPP_INITIATOR_AUTHENTICATING_TAG = 0x100A,
87 DPP_RESPONDER_AUTHENTICATING_TAG = 0x100B,
88 DPP_CONFIGURATION_OBJECT = 0x100C,
89 DPP_CONNECTOR = 0x100D,
90 DPP_CONFIGURATION_ATTRIBUTES_OBJECT = 0x100E,
G_DEFINE_TYPE_WITH_PRIVATE(GSocketListener,g_socket_listener,G_TYPE_OBJECT)91 DPP_BOOTSTRAPPING_KEY = 0x100F,
92 DPP_FINITE_CYCLIC_GROUP = 0x1012,
93 DPP_ENCRYPTED_KEY = 0x1013,
94 DPP_ENROLLEE_NONCE = 0x1014,
95 DPP_CODE_IDENTIFIER = 0x1015,
96 DPP_TRANSACTION_ID = 0x1016,
97 DPP_BOOTSTRAPPING_INFO = 0x1017,
98 DPP_CHANNEL = 0x1018,
99 DPP_PROTOCOL_VERSION = 0x1019,
100 DPP_ENVELOPEDATA = 0x101A,
101 DPP_SENDCONNSTATUS = 0x101B,
102 DPP_CONNSTATUS = 0x101C,
103 DPP_RECONFIG_FLAGS = 0x101D,
104 DPP_C_SIGN_KEY_HASH = 0x101E,
105 DPP_CSR_ATTRIBUTES_REQUEST = 0x101F,
106 DPP_A_NONCE = 0x1020,
107 DPP_E_PRIME_ID = 0x1021
108 };
109
110 static const value_string dpp_ie_attr_ids[] = {
111 { DPP_STATUS, "DPP Status" },
112 { DPP_INITIATOR_BOOTSTRAPPING_KEY_HASH, "DPP Initiator Bootstrapping Key Hash" },
g_socket_listener_get_property(GObject * object,guint prop_id,GValue * value,GParamSpec * pspec)113 { DPP_RESPONDER_BOOTSTRAPPING_KEY_HASH, "DPP Responder Bootstrapping Key Hash" },
114 { DPP_INITIATOR_PROTOCOL_KEY, "DPP Initiator Protocol Key" },
115 { DPP_WRAPPED_DATA, "DPP Primary Wrapped Data" },
116 { DPP_INITIATOR_NONCE, "DPP Initiator Nonce" },
117 { DPP_INITIATOR_CAPABILITIES, "DPP Initiator Capabilities" },
118 { DPP_RESPONDER_NONCE, "DPP Responder Nonce" },
119 { DPP_RESPONDER_CAPABILITIES, "DPP Responder Capabilities" },
120 { DPP_RESPONDER_PROTOCOL_KEY, "DPP Responder Protocol Key" },
121 { DPP_INITIATOR_AUTHENTICATING_TAG, "DPP Initiator Authenticating Tag" },
122 { DPP_RESPONDER_AUTHENTICATING_TAG, "DPP Responder Authenticating Tag" },
123 { DPP_CONFIGURATION_OBJECT, "DPP Configuration Object" },
124 { DPP_CONNECTOR, "DPP Connector" },
125 { DPP_CONFIGURATION_ATTRIBUTES_OBJECT, "DPP Configuration Attributes Object" },
126 { DPP_BOOTSTRAPPING_KEY, "DPP Bootstrapping Key" },
127 { DPP_FINITE_CYCLIC_GROUP, "DPP Finite Cyclic Group" },
128 { DPP_ENCRYPTED_KEY, "DPP Encrypted Key" },
129 { DPP_CODE_IDENTIFIER, "DPP Code Identifier" },
130 { DPP_TRANSACTION_ID, "DPP Transaction ID" },
131 { DPP_BOOTSTRAPPING_INFO, "DPP Bootstrapping Info" },
g_socket_listener_set_property(GObject * object,guint prop_id,const GValue * value,GParamSpec * pspec)132 { DPP_CHANNEL, "DPP Channel" },
133 { DPP_PROTOCOL_VERSION, "DPP Protocol Version" },
134 { DPP_ENVELOPEDATA, "DPP Enveloped Data" },
135 { DPP_SENDCONNSTATUS, "DPP Send Conn Status" },
136 { DPP_CONNSTATUS, "DPP Conn Status" },
137 { DPP_RECONFIG_FLAGS, "DPP Reconfig Flags" },
138 { DPP_C_SIGN_KEY_HASH, "DPP C-sign key Hash" },
139 { DPP_CSR_ATTRIBUTES_REQUEST, "DPP CSR Attributes Request" },
140 { DPP_A_NONCE, "DPP A-NONCE" },
141 { DPP_E_PRIME_ID, "DPP E'-id" },
142 { 0, NULL }
143 };
144
145 enum {
146 DPP_AUTHENTICATION_REQUEST = 0,
147 DPP_AUTHENTICATION_RESPONSE = 1,
148 DPP_AUTHENTICATION_CONFIRM = 2,
149 DPP_PEER_DISCOVERY_REQUEST = 5,
150 DPP_PEER_DISCOVERY_RESPONSE = 6,
g_socket_listener_class_init(GSocketListenerClass * klass)151 DPP_PKEX_EXCHANGE_REQUEST = 7,
152 DPP_PKEX_EXCHANGE_RESPONSE = 8,
153 DPP_PKEX_COMMIT_REVEAL_REQUEST = 9,
154 DPP_PKEX_COMMIT_REVEAL_RESPONSE = 10,
155 DPP_CONFIGURATION_RESULT = 11,
156 DPP_CONNECTION_STATUS_RESULT = 12,
157 DPP_PRESENCE_ANNOUNCEMENT = 13,
158 DPP_RECONFIG_ANNOUNCEMENT = 14,
159 DPP_RECONFIG_AUTH_REQUEST = 15,
160 DPP_RECONFIG_AUTH_RESPONSE = 16,
161 DPP_RECONFIG_AUTH_CONFIRM = 17
162 };
163
164 static const value_string dpp_public_action_subtypes[] = {
165 { DPP_AUTHENTICATION_REQUEST, "Authentication Request" },
166 { DPP_AUTHENTICATION_RESPONSE, "Authentication Response" },
167 { DPP_AUTHENTICATION_CONFIRM, "Authentication Confirm" },
168 { DPP_PEER_DISCOVERY_REQUEST, "Peer Discovery Request" },
169 { DPP_PEER_DISCOVERY_RESPONSE, "Peer Discovery Response" },
170 { DPP_PKEX_EXCHANGE_REQUEST, "PKEX Exchange Request" },
171 { DPP_PKEX_EXCHANGE_RESPONSE, "PKEX Exchange Response" },
172 { DPP_PKEX_COMMIT_REVEAL_REQUEST, "PKEX Commit-Reveal Request" },
173 { DPP_PKEX_COMMIT_REVEAL_RESPONSE, "PKEX Commit-Reveal Response" },
174 { DPP_CONFIGURATION_RESULT, "Configuration Result" },
175 { DPP_CONNECTION_STATUS_RESULT, "Connection Status Result" },
176 { DPP_PRESENCE_ANNOUNCEMENT, "Presence Announcement" },
177 { DPP_RECONFIG_ANNOUNCEMENT, "Reconfig Announcement" },
178 { DPP_RECONFIG_AUTH_REQUEST, "Reconfig Authentication Request" },
179 { DPP_RECONFIG_AUTH_RESPONSE, "Reconfig Authentication Response" },
180 { DPP_RECONFIG_AUTH_CONFIRM, "Reconfig Authentication Confirm" },
181 { 0, NULL }
182 };
183
184 /*
185 * This table and the one above share values ... but this one is truncated.
186 */
187 static const value_string dpp_action_subtypes[] = {
188 { DPP_AUTHENTICATION_REQUEST, "Authentication Request" },
189 { DPP_AUTHENTICATION_RESPONSE, "Authentication Response" },
190 { DPP_AUTHENTICATION_CONFIRM, "Authentication Confirm" },
191 { DPP_PEER_DISCOVERY_REQUEST, "Peer Discovery Request" },
192 { DPP_PEER_DISCOVERY_RESPONSE, "Peer Discovery Response" },
193 { 0, NULL }
194 };
195
196 static const range_string dpp_protocol_version_rvals[] = {
197 { 0, 0, "Reserved" },
g_socket_listener_init(GSocketListener * listener)198 { 1, 1, "1.0" },
199 { 2, 255, "Reserved" },
200 { 0, 0, NULL }
201 };
202
203 static int proto_wifi_dpp = -1;
204
205 static gint ett_wifi_dpp_ie_generic = -1;
206 static gint ett_wifi_dpp_attributes = -1;
207 static gint ett_wifi_dpp_pa = -1;
208 static gint ett_wifi_dpp_attribute = -1;
209 static gint ett_wifi_dpp_attr_header = -1;
210 static gint ett_wifi_dpp_attr_value = -1;
211
212 static int hf_wifi_dpp_ie_attr_id = -1;
213 static int hf_wifi_dpp_ie_attr_len = -1;
214 static int hf_wifi_dpp_ie_generic = -1; /* Remove eventually */
215 static int hf_wifi_dpp_action_dialog_token = -1;
216 static int hf_wifi_dpp_action_subtype = -1;
217 static int hf_wifi_dpp_crypto_suite = -1;
g_socket_listener_new(void)218 static int hf_wifi_dpp_public_action_subtype = -1;
219 static int hf_wifi_dpp_init_hash = -1;
220 static int hf_wifi_dpp_resp_hash = -1;
221 static int hf_wifi_dpp_status = -1;
222 static int hf_wifi_dpp_key_x = -1;
223 static int hf_wifi_dpp_key_y = -1;
check_listener(GSocketListener * listener,GError ** error)224 static int hf_wifi_dpp_trans_id = -1;
225 static int hf_wifi_dpp_finite_cyclic_group = -1;
226 static int hf_wifi_dpp_capabilities = -1;
227 static int hf_wifi_dpp_code_identifier = -1;
228 static int hf_wifi_dpp_enc_key_attribute = -1;
229 static int hf_wifi_dpp_primary_wrapped_data = -1;
230 static int hf_wifi_dpp_connector_attr = -1;
231 static int hf_wifi_dpp_initiator_nonce = -1;
232 static int hf_wifi_dpp_operating_class = -1;
233 static int hf_wifi_dpp_channel = -1;
234 static int hf_wifi_dpp_protocol_version = -1;
235 static int hf_wifi_dpp_a_nonce = -1;
236 static int hf_wifi_dpp_e_prime_id = -1;
237 static int hf_wifi_dpp_unknown_anqp_item = -1;
238
239 static int hf_wifi_dpp_tcp_pdu_length = -1;
240 static int hf_wifi_dpp_tcp_pdu_action_field = -1;
241 static int hf_wifi_dpp_tcp_oui = -1;
242 static int hf_wifi_dpp_tcp_oui_type = -1;
243 static int hf_wifi_dpp_tcp_dialog_token = -1;
244 static int hf_wifi_dpp_tcp_adv_proto_elt = -1;
245 static int hf_wifi_dpp_tcp_vendor_specific = -1;
246 static int hf_wifi_dpp_tcp_vendor_spec_len = -1;
247 static int hf_wifi_dpp_tcp_config = -1;
248 static int hf_wifi_dpp_tcp_query_req_len = -1;
249 static int hf_wifi_dpp_tcp_status_code = -1;
250 static int hf_wifi_dpp_gas_query_resp_frag_id = -1;
251 static int hf_wifi_dpp_tcp_comeback_delay = -1;
252 static int hf_wifi_dpp_tcp_query_resp_len = -1;
253
254 static int
255 dissect_wifi_dpp(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, void *data _U_)
256 {
257 int offset = 0;
258
259 proto_tree_add_item(tree, hf_wifi_dpp_unknown_anqp_item, tvb, offset, tvb_reported_length_remaining(tvb, offset), ENC_NA);
260 return tvb_captured_length(tvb);
261 }
262
g_socket_listener_add_socket(GSocketListener * listener,GSocket * socket,GObject * source_object,GError ** error)263 static int
264 dissect_wifi_dpp_ie(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *tree, void *data _U_)
265 {
266 proto_item *ie;
267 guint remaining_len = tvb_reported_length(tvb);
268
269 ie = proto_tree_add_subtree(tree, tvb, 0, remaining_len, ett_wifi_dpp_ie_generic, NULL, "Generic DPP IE");
270 proto_tree_add_item(ie, hf_wifi_dpp_ie_generic, tvb, 0, remaining_len,
271 ENC_NA);
272 return tvb_captured_length(tvb);
273 }
274
275 static int
276 dissect_wifi_dpp_attributes(packet_info *pinfo _U_, proto_tree *tree,
277 tvbuff_t *tvb, int offset _U_)
278 {
279 proto_item *si = NULL;
280 guint8 status;
281 proto_tree *attr, *specific_attr, *attr_hdr;
282 guint16 attribute_id;
283 guint16 attribute_len;
284 guint attributes_len = 0;
285 guint remaining_len = tvb_reported_length_remaining(tvb, offset);
286
287 while (remaining_len) {
288 attribute_id = tvb_get_guint16(tvb, offset, ENC_LITTLE_ENDIAN);
289 attribute_len = tvb_get_guint16(tvb, offset + 2, ENC_LITTLE_ENDIAN);
290 attr = proto_tree_add_subtree_format(tree, tvb, offset,
291 attribute_len + 4, ett_wifi_dpp_attribute,
292 &si, "%s Attribute",
293 val_to_str(attribute_id,
294 dpp_ie_attr_ids,
295 "Unknown (%u)"));
296 attr_hdr = proto_tree_add_subtree(attr, tvb, offset, 4,
297 ett_wifi_dpp_attr_header, NULL,
298 "Attribute Header");
299
300 proto_tree_add_item(attr_hdr, hf_wifi_dpp_ie_attr_id, tvb, offset, 2,
301 ENC_LITTLE_ENDIAN);
302 offset += 2;
303 proto_tree_add_item(attr_hdr, hf_wifi_dpp_ie_attr_len, tvb, offset, 2,
304 ENC_LITTLE_ENDIAN);
305 offset += 2;
306
307 specific_attr = proto_tree_add_subtree(attr, tvb, offset, attribute_len,
308 ett_wifi_dpp_attr_value,
309 NULL, "Attribute Value");
310
311 switch (attribute_id) {
312 case DPP_STATUS:
313 status = tvb_get_guint8(tvb, offset);
314 proto_item_append_text(si, ": %s", val_to_str(status,
315 dpp_status_codes,
316 "Unknown (%u)"));
317 proto_tree_add_item(specific_attr, hf_wifi_dpp_status, tvb, offset, attribute_len, ENC_LITTLE_ENDIAN);
318 break;
319
320 case DPP_INITIATOR_BOOTSTRAPPING_KEY_HASH:
321 proto_tree_add_item(specific_attr, hf_wifi_dpp_init_hash, tvb, offset, attribute_len, ENC_NA);
322 break;
323
324 case DPP_RESPONDER_BOOTSTRAPPING_KEY_HASH:
325 proto_tree_add_item(specific_attr, hf_wifi_dpp_resp_hash, tvb, offset, attribute_len, ENC_NA);
326 break;
327
328 case DPP_RESPONDER_PROTOCOL_KEY:
329 case DPP_INITIATOR_PROTOCOL_KEY:
330 // This is two protocol keys of equal length, X then Y.
331 proto_tree_add_item(specific_attr, hf_wifi_dpp_key_x, tvb, offset, attribute_len/2, ENC_NA);
332 proto_tree_add_item(specific_attr, hf_wifi_dpp_key_y, tvb, offset + attribute_len/2, attribute_len/2, ENC_NA);
g_socket_listener_add_address(GSocketListener * listener,GSocketAddress * address,GSocketType type,GSocketProtocol protocol,GObject * source_object,GSocketAddress ** effective_address,GError ** error)333 break;
334
335 case DPP_TRANSACTION_ID:
336 proto_tree_add_item(specific_attr, hf_wifi_dpp_trans_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
337 break;
338
339 case DPP_FINITE_CYCLIC_GROUP:
340 case DPP_RESPONDER_CAPABILITIES:
341 proto_tree_add_item(specific_attr, hf_wifi_dpp_finite_cyclic_group, tvb, offset, 2, ENC_LITTLE_ENDIAN);
342 break;
343
344 case DPP_INITIATOR_CAPABILITIES:
345 proto_tree_add_item(specific_attr, hf_wifi_dpp_capabilities, tvb, offset, 1, ENC_LITTLE_ENDIAN);
346 break;
347
348 case DPP_CODE_IDENTIFIER:
349 proto_tree_add_item(specific_attr, hf_wifi_dpp_code_identifier, tvb, offset, attribute_len, ENC_UTF_8|ENC_NA);
350 break;
351
352 case DPP_ENCRYPTED_KEY:
353 proto_tree_add_item(specific_attr, hf_wifi_dpp_enc_key_attribute, tvb, offset, attribute_len, ENC_NA);
354 break;
355
356 case DPP_WRAPPED_DATA:
357 proto_tree_add_item(specific_attr, hf_wifi_dpp_primary_wrapped_data, tvb, offset, attribute_len, ENC_NA);
358 break;
359
360 case DPP_CONNECTOR:
361 proto_tree_add_item(specific_attr, hf_wifi_dpp_connector_attr, tvb,
362 offset, attribute_len, ENC_NA);
363 break;
364
365 case DPP_INITIATOR_NONCE:
366 proto_tree_add_item(specific_attr, hf_wifi_dpp_initiator_nonce, tvb,
367 offset, attribute_len, ENC_NA);
368 break;
369
370 case DPP_CHANNEL:
371 proto_tree_add_item(specific_attr, hf_wifi_dpp_operating_class, tvb,
372 offset, 1, ENC_NA);
373 proto_tree_add_item(specific_attr, hf_wifi_dpp_channel, tvb, offset + 1,
374 1, ENC_NA);
375 break;
376
377 case DPP_PROTOCOL_VERSION:
378 proto_tree_add_item(specific_attr, hf_wifi_dpp_protocol_version, tvb,
379 offset, 1, ENC_NA);
380 break;
381
382 case DPP_A_NONCE:
383 proto_tree_add_item(specific_attr, hf_wifi_dpp_a_nonce, tvb, offset,
384 attribute_len, ENC_NA);
385 break;
386
387 case DPP_E_PRIME_ID:
388 proto_tree_add_item(specific_attr, hf_wifi_dpp_e_prime_id, tvb, offset,
389 attribute_len, ENC_NA);
390 break;
391
392 case DPP_INITIATOR_AUTHENTICATING_TAG:
393
394 case DPP_RESPONDER_AUTHENTICATING_TAG:
395
396 case DPP_CONFIGURATION_OBJECT:
397
398 case DPP_CONFIGURATION_ATTRIBUTES_OBJECT:
399
400 case DPP_BOOTSTRAPPING_KEY:
401
402 case DPP_ENROLLEE_NONCE:
403
404 default:
405 proto_tree_add_item(specific_attr, hf_wifi_dpp_ie_generic, tvb, offset, attribute_len, ENC_NA);
406 break;
407 }
408
409 offset += attribute_len;
410 attributes_len += attribute_len + 4;
411 remaining_len -= (attribute_len + 4);
412
413 }
414
415 return attributes_len; // We return the attribute length plus hdr!
416 }
417
418 int
419 dissect_wifi_dpp_config_proto(packet_info *pinfo _U_, proto_tree *tree,
420 tvbuff_t *tvb, int offset _U_)
421 {
422 proto_item *dpp_item;
423 proto_tree *dpp_tree, *attr_tree;
424 guint remaining_len = tvb_reported_length_remaining(tvb, offset);
425
426 dpp_item = proto_tree_add_item(tree, proto_wifi_dpp, tvb, offset, -1, ENC_NA);
427 dpp_tree = proto_item_add_subtree(dpp_item, ett_wifi_dpp_pa);
428 proto_item_append_text(dpp_item, " Configuration");
429
430 attr_tree = proto_tree_add_subtree_format(dpp_tree, tvb, offset,
431 remaining_len,
g_socket_listener_add_inet_port(GSocketListener * listener,guint16 port,GObject * source_object,GError ** error)432 ett_wifi_dpp_attributes, NULL,
433 "DPP Attributes");
434
435 offset = dissect_wifi_dpp_attributes(pinfo, attr_tree, tvb, offset);
436
437 return offset;
438 }
439
440 int
441 dissect_wifi_dpp_public_action(tvbuff_t *tvb, packet_info *pinfo,
442 proto_tree *tree, void *data _U_)
443 {
444 guint8 subtype;
445 guint remaining_len;
446 proto_item *dpp_item;
447 proto_tree *dpp_tree, *attr_tree;
448 guint16 attributes_len;
449 int offset = 0;
450
451 col_set_str(pinfo->cinfo, COL_PROTOCOL, "wifi_dpp");
452
453 /* The Crypto suite comes before the DPP frame type */
454 subtype = tvb_get_guint8(tvb, offset + 1);
455 col_append_fstr(pinfo->cinfo, COL_INFO, ", DPP - %s",
456 val_to_str(subtype, dpp_public_action_subtypes,
457 "Unknown (%u)"));
458
459 remaining_len = tvb_reported_length_remaining(tvb, offset);
460
461 dpp_item = proto_tree_add_item(tree, proto_wifi_dpp, tvb, offset, -1, ENC_NA);
462 dpp_tree = proto_item_add_subtree(dpp_item, ett_wifi_dpp_pa);
463 proto_item_append_text(dpp_item, ": %s", val_to_str(subtype,
464 dpp_public_action_subtypes,
465 "Unknown (%u)"));
466 proto_tree_add_item(dpp_tree, hf_wifi_dpp_crypto_suite, tvb, offset, 1,
467 ENC_LITTLE_ENDIAN);
468 offset++;
469 remaining_len--;
470
471 proto_tree_add_item(dpp_tree, hf_wifi_dpp_public_action_subtype, tvb, offset,
472 1, ENC_LITTLE_ENDIAN);
473 offset++; /* Skip the OUI Subtype/DPP Request type */
474 remaining_len--;
475 if (remaining_len) {
476 attr_tree = proto_tree_add_subtree_format(dpp_tree, tvb, offset,
477 remaining_len,
478 ett_wifi_dpp_attributes, NULL, "DPP Attributes");
479
480 attributes_len = dissect_wifi_dpp_attributes(pinfo, attr_tree, tvb, offset);
481 offset += attributes_len;
482 }
483
484 return offset;
485 }
486
487 static int
488 dissect_wifi_dpp_tcp_pdu(tvbuff_t *tvb, packet_info *pinfo _U_,
489 proto_tree *tree, void *data _U_)
490 {
491 int offset = 0;
492 guint8 action;
493 tvbuff_t *newtvb;
494
495 col_set_str(pinfo->cinfo, COL_PROTOCOL, "dpp");
496
497 /*
498 * We get a length, followed by Action field, OUI, OUI type and then a
499 * DPP public action
500 */
501 proto_tree_add_item(tree, hf_wifi_dpp_tcp_pdu_length, tvb, offset, 4,
502 ENC_BIG_ENDIAN);
503 offset += 4;
504
505 action = tvb_get_guint8(tvb, offset);
506 proto_tree_add_item(tree, hf_wifi_dpp_tcp_pdu_action_field, tvb, offset, 1,
507 ENC_NA);
508 offset += 1;
509
510 if (action == 0x09) {
511 proto_tree_add_item(tree, hf_wifi_dpp_tcp_oui, tvb, offset, 3, ENC_NA);
512 offset += 3;
513
514 proto_tree_add_item(tree, hf_wifi_dpp_tcp_oui_type, tvb, offset, 1, ENC_NA);
515 offset += 1;
516
517 newtvb = tvb_new_subset_remaining(tvb, offset);
518
519 offset += dissect_wifi_dpp_public_action(newtvb, pinfo, tree, NULL);
520 } else if (action == 0x0a) {
521 col_append_str(pinfo->cinfo, COL_INFO, ", DPP - Configuration Request");
522
523 proto_tree_add_item(tree, hf_wifi_dpp_tcp_dialog_token, tvb, offset, 1,
524 ENC_NA);
525 offset += 1;
526
527 proto_tree_add_item(tree, hf_wifi_dpp_tcp_adv_proto_elt, tvb, offset, 3,
528 ENC_NA);
529 offset += 3;
530
531 proto_tree_add_item(tree, hf_wifi_dpp_tcp_vendor_specific, tvb, offset, 1,
532 ENC_NA);
533 offset += 1;
534 proto_tree_add_item(tree, hf_wifi_dpp_tcp_vendor_spec_len, tvb, offset, 1,
535 ENC_NA);
536 offset += 1;
537
538 proto_tree_add_item(tree, hf_wifi_dpp_tcp_oui, tvb, offset, 3, ENC_NA);
539 offset += 3;
540
541 proto_tree_add_item(tree, hf_wifi_dpp_tcp_oui_type, tvb, offset, 1, ENC_NA);
542 offset += 1;
543
544 proto_tree_add_item(tree, hf_wifi_dpp_tcp_config, tvb, offset, 1, ENC_NA);
545 offset += 1;
546
547 proto_tree_add_item(tree, hf_wifi_dpp_tcp_query_req_len, tvb, offset, 2,
548 ENC_LITTLE_ENDIAN);
549 offset += 2;
550
551 offset += dissect_wifi_dpp_config_proto(pinfo, tree, tvb, offset);
552 } else if (action == 0x0b || action == 0x0d) {
553 guint16 qr_len;
554
555 col_append_str(pinfo->cinfo, COL_INFO, ", DPP - Configuration Response");
556
557 proto_tree_add_item(tree, hf_wifi_dpp_tcp_dialog_token, tvb, offset, 1,
558 ENC_NA);
559 offset += 1;
560
561 proto_tree_add_item(tree, hf_wifi_dpp_tcp_status_code, tvb, offset, 2,
562 ENC_LITTLE_ENDIAN);
563 offset += 2;
564
565 if (action == 0x0d) {
566 proto_tree_add_item(tree, hf_wifi_dpp_gas_query_resp_frag_id, tvb, offset,
567 1, ENC_NA);
568 offset += 1;
569 }
570
571 proto_tree_add_item(tree, hf_wifi_dpp_tcp_comeback_delay, tvb, offset, 2,
572 ENC_LITTLE_ENDIAN);
573 offset += 2;
574
575 proto_tree_add_item(tree, hf_wifi_dpp_tcp_adv_proto_elt, tvb, offset, 3,
576 ENC_NA);
577 offset += 3;
578
579 proto_tree_add_item(tree, hf_wifi_dpp_tcp_vendor_specific, tvb, offset, 1,
580 ENC_NA);
581 offset += 1;
582 proto_tree_add_item(tree, hf_wifi_dpp_tcp_vendor_spec_len, tvb, offset, 1,
583 ENC_NA);
584 offset += 1;
585
586 proto_tree_add_item(tree, hf_wifi_dpp_tcp_oui, tvb, offset, 3, ENC_NA);
587 offset += 3;
588
589 proto_tree_add_item(tree, hf_wifi_dpp_tcp_oui_type, tvb, offset, 1, ENC_NA);
590 offset += 1;
591
592 proto_tree_add_item(tree, hf_wifi_dpp_tcp_config, tvb, offset, 1, ENC_NA);
593 offset += 1;
594
595 qr_len = tvb_get_letohs(tvb, offset);
596 proto_tree_add_item(tree, hf_wifi_dpp_tcp_query_resp_len, tvb, offset, 2,
597 ENC_LITTLE_ENDIAN);
598 offset += 2;
599
add_sources(GSocketListener * listener,GSocketSourceFunc callback,gpointer callback_data,GCancellable * cancellable,GMainContext * context)600 if (qr_len) {
601 offset += dissect_wifi_dpp_config_proto(pinfo, tree, tvb, offset);
602 }
603 }
604
605 return offset;
606 }
607
608 static guint
609 get_wifi_dpp_tcp_len(packet_info *pinfo _U_, tvbuff_t *tvb, int offset,
610 void *data _U_)
611 {
612 guint pkt_len;
613
614 pkt_len = tvb_get_ntohl(tvb, offset);
615
616 return pkt_len + 4;
617 }
618
619 /*
620 * We need 4 bytes for the length ...
621 */
622 #define DPP_TCP_HEADER_LEN 4
623 static int
624 dissect_wifi_dpp_tcp_pdus(tvbuff_t *tvb, packet_info *pinfo _U_,
625 proto_tree *tree, void *data _U_)
626 {
627 if (!tvb_bytes_exist(tvb, 0, DPP_TCP_HEADER_LEN))
628 return 0;
free_sources(GList * sources)629
630 tcp_dissect_pdus(tvb, pinfo, tree, TRUE, DPP_TCP_HEADER_LEN,
631 get_wifi_dpp_tcp_len, dissect_wifi_dpp_tcp_pdu, data);
632 return tvb_reported_length(tvb);
633 }
634
635 void
636 proto_register_wifi_dpp(void)
637 {
638 static module_t *wifi_dpp_module;
639 static hf_register_info hf[] = {
640 { &hf_wifi_dpp_status,
641 { "Wi-Fi DPP Status", "dpp.status",
642 FT_UINT8, BASE_HEX, VALS(dpp_status_codes), 0x0, NULL, HFILL }},
643 { &hf_wifi_dpp_init_hash,
644 { "Wi-Fi DPP Initiator Hash", "dpp.init.hash",
645 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
646 { &hf_wifi_dpp_resp_hash,
accept_callback(GSocket * socket,GIOCondition condition,gpointer user_data)647 { "Wi-Fi DPP Responder Hash", "dpp.resp.hash",
648 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
649 { &hf_wifi_dpp_key_x,
650 { "Wi-Fi DPP Key X value", "dpp.key.x",
651 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
652 { &hf_wifi_dpp_key_y,
653 { "Wi-Fi DPP Key Y value", "dpp.key.y",
654 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
655 { &hf_wifi_dpp_trans_id,
656 { "Wi-Fi DPP Transaction ID", "dpp.trans_id",
657 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
658 { &hf_wifi_dpp_finite_cyclic_group,
659 { "Wi-Fi DPP Finite Cyclic Group", "dpp.finite_cyclic_group",
660 FT_UINT16, BASE_HEX, NULL, 0x0, NULL, HFILL }},
661 { &hf_wifi_dpp_capabilities,
662 { "Wi-Fi DPP Capabilities", "dpp.capabilities",
663 FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
664 { &hf_wifi_dpp_code_identifier,
665 { "Wi-Fi DPP Code Identifier", "dpp.code_identifier",
666 FT_STRING, BASE_NONE, NULL, 0x0, NULL, HFILL }},
667 { &hf_wifi_dpp_enc_key_attribute,
668 { "Wi-Fi DPP Encrypted Key Attribute", "dpp.pkex.enckey",
669 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
670 { &hf_wifi_dpp_primary_wrapped_data,
671 { "Wi-Fi DPP Primary Wrapped Data", "dpp.primary.wrapped_data",
672 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
673 { &hf_wifi_dpp_connector_attr,
674 { "Wi-Fi DPP Connector Attribute", "dpp.connector_data",
675 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
676 { &hf_wifi_dpp_initiator_nonce,
677 { "Wi-Fi DPP Initiator Nonce", "dpp.initiator_nonce",
678 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
679 { &hf_wifi_dpp_operating_class,
680 { "Operating Class", "dpp.operating_class",
681 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
682 { &hf_wifi_dpp_channel,
683 { "Channel", "dpp.channel",
684 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
685 { &hf_wifi_dpp_protocol_version,
g_socket_listener_accept_socket(GSocketListener * listener,GObject ** source_object,GCancellable * cancellable,GError ** error)686 { "Protocol Version", "dpp.protocol_version",
687 FT_UINT8, BASE_DEC|BASE_RANGE_STRING, RVALS(dpp_protocol_version_rvals),
688 0x0, NULL, HFILL }},
689 { &hf_wifi_dpp_a_nonce,
690 { "A-NONCE", "dpp.a_nonce",
691 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
692 { &hf_wifi_dpp_e_prime_id,
693 { "E'-id", "dpp.e_prime_id",
694 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
695 { &hf_wifi_dpp_ie_attr_id,
696 { "Wi-Fi DPP IE Attribute ID", "dpp.ie.attr_id",
697 FT_UINT16, BASE_HEX, VALS(dpp_ie_attr_ids), 0x0, NULL, HFILL }},
698 { &hf_wifi_dpp_ie_attr_len,
699 { "Wi-Fi DPP IE Attribute Len", "dpp.ie.attr_len",
700 FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
701 { &hf_wifi_dpp_ie_generic,
702 { "Wi-Fi DPP IE generic", "dpp.ie.generic",
703 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
704 { &hf_wifi_dpp_action_subtype,
705 { "Wi-Fi DPP Action Subtype", "dpp.action.subtype",
706 FT_UINT8, BASE_DEC, VALS(dpp_action_subtypes), 0x0, NULL, HFILL }},
707 { &hf_wifi_dpp_action_dialog_token,
708 { "Wi-Fi DPP Action Dialog Token", "dpp.action.dialog_token",
709 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
710 { &hf_wifi_dpp_crypto_suite,
711 { "Wi-Fi DPP Cryptographic Suite", "dpp.public_action.crypto_suite",
712 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
713 { &hf_wifi_dpp_public_action_subtype,
714 { "Wi-Fi DPP Public Action Subtype", "dpp.public_action.subtype",
715 FT_UINT8, BASE_DEC, VALS(dpp_public_action_subtypes), 0x0, NULL, HFILL }},
716 { &hf_wifi_dpp_unknown_anqp_item,
717 { "Wi-fi DPP Unknown ANQP Item", "dpp.unknown_anqp_item",
718 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
719
720 { &hf_wifi_dpp_tcp_pdu_length,
721 { "DPP TCP PDU length", "dpp.tcp.length",
722 FT_UINT32, BASE_DEC, NULL, 0x0, NULL, HFILL }},
723
724 { &hf_wifi_dpp_tcp_pdu_action_field,
725 { "DPP TCP PDU Action type", "dpp.tcp.action_type",
726 FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
727
728 { &hf_wifi_dpp_tcp_oui,
729 { "DPP TCP PDU OUI", "dpp.tcp.oui",
730 FT_UINT24, BASE_OUI, NULL, 0x0, NULL, HFILL }},
731
732 { &hf_wifi_dpp_tcp_oui_type,
733 { "DPP TCP PDU OUI type", "dpp.tcp.oui_type",
734 FT_UINT8, BASE_DEC, VALS(wfa_subtype_vals), 0, NULL, HFILL }},
735
736 { &hf_wifi_dpp_tcp_dialog_token,
737 { "DPP TCP PDU Dialog Token", "dpp.tcp.dialog_token",
738 FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
739
740 { &hf_wifi_dpp_tcp_adv_proto_elt,
741 { "DPP TCP PDU Advertisement Protocol Element",
742 "dpp.tcp.adv_proto_elt",
743 FT_BYTES, BASE_NONE, NULL, 0x0, NULL, HFILL }},
744
745 { &hf_wifi_dpp_tcp_vendor_specific,
746 { "DPP TCP PDU Vendor Specific tag", "dpp.tcp.vendor_spec_tag",
747 FT_UINT8, BASE_HEX, NULL, 0x0, NULL, HFILL }},
748
749 { &hf_wifi_dpp_tcp_vendor_spec_len,
750 { "DPP TCP PDU Vendor Specific len", "dpp.tcp.vendor_spec_len",
751 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
752
753 { &hf_wifi_dpp_tcp_config,
754 { "DPP TCP PDU Configuration", "dpp.tcp.config",
755 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
756
757 { &hf_wifi_dpp_tcp_query_req_len,
758 { "DPP TCP PDU Query Req len", "dpp.tcp.query_req_len",
759 FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
g_socket_listener_accept(GSocketListener * listener,GObject ** source_object,GCancellable * cancellable,GError ** error)760
761 { &hf_wifi_dpp_gas_query_resp_frag_id,
762 { "DPP TCP PDU GAS Query Response Fragment ID",
763 "dpp.tp.query_resp_frag_id",
764 FT_UINT8, BASE_DEC, NULL, 0x0, NULL, HFILL }},
765
766 { &hf_wifi_dpp_tcp_status_code,
767 { "DPP TCP PDU Status Code", "dpp.tcp.status_code",
768 FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
769
770 { &hf_wifi_dpp_tcp_comeback_delay,
771 { "DPP TCP PDU Comeback Delay", "dpp.tcp.comeback_delay",
772 FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
773
774 { &hf_wifi_dpp_tcp_query_resp_len,
775 { "DPP TCP PDU Query Resp Len", "dpp.tcp.query_resp_len",
776 FT_UINT16, BASE_DEC, NULL, 0x0, NULL, HFILL }},
777 };
778 static gint *ett[] = {
779 &ett_wifi_dpp_ie_generic,
780 &ett_wifi_dpp_attributes,
781 &ett_wifi_dpp_pa,
782 &ett_wifi_dpp_attribute,
783 &ett_wifi_dpp_attr_header,
784 &ett_wifi_dpp_attr_value,
785 };
786
787 proto_wifi_dpp = proto_register_protocol("Wi-Fi Device Provisioning Protocol", "Wi-Fi DPP", "dpp");
accept_socket_async_data_free(AcceptSocketAsyncData * data)788 proto_register_field_array(proto_wifi_dpp, hf, array_length(hf));
789 proto_register_subtree_array(ett, array_length(ett));
790
791 /* Register the preferred TCP port? Is there one? */
792 wifi_dpp_module = prefs_register_protocol(proto_wifi_dpp, NULL);
793 prefs_register_uint_preference(wifi_dpp_module, "tcp.port", "DPP TCP Port",
794 "The TCP port DPP over TCP uses",
accept_ready(GSocket * accept_socket,GIOCondition condition,gpointer user_data)795 10, &wifi_dpp_tcp_port);
796 }
797
798 void
799 proto_reg_handoff_wifi_dpp(void)
800 {
801 static gboolean initialized = FALSE;
802 static dissector_handle_t wifi_dpp_tcp_handle;
803 static int current_port;
804
805 dissector_add_uint("wlan.anqp.wifi_alliance.subtype", WFA_SUBTYPE_DPP, create_dissector_handle(dissect_wifi_dpp, proto_wifi_dpp));
806 dissector_add_uint("wlan.ie.wifi_alliance.subtype", WFA_SUBTYPE_DPP, create_dissector_handle(dissect_wifi_dpp_ie, proto_wifi_dpp));
807 dissector_add_uint("wlan.pa.wifi_alliance.subtype", WFA_SUBTYPE_DPP, create_dissector_handle(dissect_wifi_dpp_public_action, proto_wifi_dpp));
808
809 /*
810 * Register the TCP port
811 */
812 if (!initialized) {
813 wifi_dpp_tcp_handle = create_dissector_handle(dissect_wifi_dpp_tcp_pdus,
814 proto_wifi_dpp);
815 initialized = TRUE;
816 } else {
817 dissector_delete_uint("tcp.port", current_port, wifi_dpp_tcp_handle);
818 }
819
820 current_port = wifi_dpp_tcp_port;
821 dissector_add_uint("tcp.port", current_port, wifi_dpp_tcp_handle);
822 }
823
824 /*
825 * Editor modelines
826 *
827 * Local Variables:
828 * c-basic-offset: 2
829 * tab-width: 8
830 * indent-tabs-mode: nil
831 * End:
832 *
833 * ex: set shiftwidth=2 tabstop=8 expandtab:
834 * :indentSize=2:tabSize=8:noTabs=true:
835 */
836