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packet-rf4ce-secur.h
1/* packet-rf4ce-secur.h
2 * Security related functions and objects for RF4CE dissector
3 * Copyright (C) Atmosic 2023
4 *
5 * Wireshark - Network traffic analyzer
6 * By Gerald Combs <[email protected]>
7 * Copyright 1998 Gerald Combs
8 *
9 * SPDX-License-Identifier: GPL-2.0-or-later
10 */
11
12#ifndef PACKET_RF4CE_SECUR_H
13#define PACKET_RF4CE_SECUR_H
14
15#include <stdbool.h>
16#include "config.h"
17#include <epan/packet.h>
18#include <epan/expert.h>
19#include <epan/uat.h>
20#include <epan/value_string.h>
21
22#define RF4CE_IEEE_ADDR_LEN 8
23#define RF4CE_SHORT_ADDR_LEN 2
24
25#define RF4CE_MIN_NWK_LENGTH 5
26#define RF4CE_MAX_NWK_LENGTH 148
27
28#define RF4CE_VENDOR_SECRET_STORAGE_SIZE 64
29#define RF4CE_NWK_KEY_STORAGE_SIZE 64
30#define RF4CE_ADDR_TABLE_SIZE (RF4CE_NWK_KEY_STORAGE_SIZE * 2)
31
32#define RF4CE_NWK_KEY_SEED_DATA_LENGTH 80
33
34#define RF4CE_CCM_M 4
35#define RF4CE_CCM_L 2
36#define RF4CE_CCM_NONCE_LEN (15 - RF4CE_CCM_L)
37#define RF4CE_SECUR_CONTROL 5
38#define SEC_STR_LEN 16
39#define KEY_LEN SEC_STR_LEN
40
41typedef struct keypair_context_s {
42 uint8_t nwk_key_seed_latest[RF4CE_NWK_KEY_SEED_DATA_LENGTH];
43 uint8_t nwk_key_seed_prev[RF4CE_NWK_KEY_SEED_DATA_LENGTH];
44 uint8_t nwk_key_seed[RF4CE_NWK_KEY_SEED_DATA_LENGTH];
45 uint8_t controller_addr[RF4CE_IEEE_ADDR_LEN];
46 uint8_t target_addr[RF4CE_IEEE_ADDR_LEN];
47 uint8_t nwk_key_exchange_transfer_expected;
48 uint8_t nwk_key_exchange_transfer_received;
50
51#define RF4CE_PROFILE_CMD_KEY_EXCHANGE_RAND_A_LENGTH 8
52#define RF4CE_PROFILE_CMD_KEY_EXCHANGE_RAND_B_LENGTH 8
53
54#define RF4CE_PROFILE_CMD_KEY_EXCHANGE_RAND_AB_LENGTH \
55 (RF4CE_PROFILE_CMD_KEY_EXCHANGE_RAND_A_LENGTH \
56 + RF4CE_PROFILE_CMD_KEY_EXCHANGE_RAND_B_LENGTH)
57
58#define RF4CE_PROFILE_CMD_KEY_EXCHANGE_TAG_A_LENGTH 4
59#define RF4CE_PROFILE_CMD_KEY_EXCHANGE_TAG_B_LENGTH 4
60
61#define RF4CE_KEY_EXCHANGE_CONTEXT_LENGTH 9
62#define RF4CE_KEY_EXCHANGE_LABEL_LENGTH (2 * (RF4CE_IEEE_ADDR_LEN))
63
64#define RF4CE_CMAC_ARG_2_LENGTH \
65 (RF4CE_KEY_EXCHANGE_CONTEXT_LENGTH \
66 + RF4CE_KEY_EXCHANGE_LABEL_LENGTH \
67 + KEY_LEN)
68
69/* RF4CE GDP 2.0 spec, part 7.4.2 Key generation
70 * Context shall be set to the ASCII representation of the nine character string (including a space
71 * after "RF4CE" but without quotes and without null termination) "RF4CE GDP".
72 */
73#define CONTEXT_STR "RF4CE GDP"
74#define CONTEXT_STR_LEN 9
75
76extern uint8_t DEFAULT_SECRET[SEC_STR_LEN];
77
78typedef struct key_exchange_context_s {
79 uint8_t rand_a[RF4CE_PROFILE_CMD_KEY_EXCHANGE_RAND_A_LENGTH];
80 uint8_t rand_b[RF4CE_PROFILE_CMD_KEY_EXCHANGE_RAND_B_LENGTH];
81 uint8_t mac_a[RF4CE_IEEE_ADDR_LEN]; /* target address */
82 uint8_t mac_b[RF4CE_IEEE_ADDR_LEN]; /* controller address */
83 bool is_proc_started;
85
86void rf4ce_aes_cmac(unsigned char *input, unsigned long length, unsigned char *key, unsigned char *mac_value);
87
88typedef struct addr_entry_s {
89 uint8_t ieee_addr[RF4CE_IEEE_ADDR_LEN];
90 uint16_t short_addr;
91 bool is_used;
93
94typedef struct nwk_key_entry_s {
95 uint8_t nwk_key[KEY_LEN];
96 addr_entry_t *controller_addr_ent;
97 addr_entry_t *target_addr_ent;
98 bool key_from_gui;
99 bool is_used;
100 bool is_pairing_key;
102
103typedef struct vendor_secret_entry_s {
104 uint8_t secret[SEC_STR_LEN];
105 bool is_used;
107
108typedef struct uat_security_record_s {
109 char *sec_str;
110 uint8_t type;
111 char *label;
113
114void keypair_context_init(const uint8_t *controller_ieee, const uint8_t *target_ieee, uint8_t expected_transfer_count);
115void keypair_context_update_seed(uint8_t *seed, uint8_t seed_seqn);
116
117void nwk_key_storage_add_entry(uint8_t *nwk_key, addr_entry_t *controller_addr_ent, addr_entry_t *target_addr_ent, bool key_from_gui, bool is_pairing_key);
118void nwk_key_storage_release_entry(uint8_t *nwk_key, bool key_from_gui);
119
120void rf4ce_addr_table_add_addrs(const void *ieee_addr, uint16_t short_addr);
121bool rf4ce_addr_table_get_ieee_addr(uint8_t *ieee_addr, packet_info *pinfo, bool is_src);
122addr_entry_t *rf4ce_addr_table_get_addr_entry_by_ieee(uint8_t *ieee_addr);
123
124void key_exchange_context_init(void);
125
126void key_exchange_context_start_procedure(void);
127void key_exchange_context_stop_procedure(void);
128bool key_exchange_context_is_procedure_started(void);
129
130void key_exchange_context_set_rand_a(uint8_t *rand_a);
131void key_exchange_context_set_rand_b(uint8_t *rand_b);
132
133void key_exchange_context_set_mac_a(uint8_t *mac_a);
134void key_exchange_context_set_mac_b(uint8_t *mac_b);
135
136void key_exchange_calc_key(uint32_t tag_b_pack);
137
138void vendor_secret_storage_add_entry(uint8_t *secret);
139void vendor_secret_storage_release_entry(uint8_t *secret);
140
141void rf4ce_secur_cleanup(void);
142
143bool decrypt_data(
144 const uint8_t *in,
145 uint8_t *out,
146 uint16_t payload_offset,
147 uint16_t *len,
148 uint8_t src_ieee[RF4CE_IEEE_ADDR_LEN],
149 uint8_t dst_ieee[RF4CE_IEEE_ADDR_LEN]);
150
151#endif /* PACKET_RF4CE_SECUR_H */
Definition packet_info.h:43
Definition packet-rf4ce-secur.h:88
Definition packet-isakmp.c:1889
Definition tvbuff_lz77huff.c:32
Definition packet-rf4ce-secur.h:78
Definition packet-rf4ce-secur.h:41
Definition packet-rf4ce-secur.h:94
Definition packet-rf4ce-secur.h:108
Definition packet-rf4ce-secur.h:103