forked from osmocom/wireshark
OSCORE: Add the new dissector - decrypt and verify the authenticity of requests
This change introduces the OSCORE dissector, following draft-ietf-core-object-security-07. It performs decryption and authenticity check on requests. Bug: 14417 Change-Id: I92e45d66d5df51f6d4dbea4ef44e707955b65bee Reviewed-on: https://code.wireshark.org/review/25480 Petri-Dish: Peter Wu <peter@lekensteyn.nl> Tested-by: Petri Dish Buildbot Reviewed-by: Peter Wu <peter@lekensteyn.nl>
This commit is contained in:
Mališa Vučinić
Peter Wu
parent
628407dea9
commit
ee901c58e6
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@ -121,6 +121,7 @@ New Radio Radio Resource Control protocol
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New Radio Radio Link Control protocol
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NR (5G) MAC protocol
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NXP 802.15.4 Sniffer Protocol
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Object Security for Constrained RESTful Environments (OSCORE)
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PFCP (Packet Forwarding Control Protocol)
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Protobuf (Protocol Buffers)
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QUIC (IETF)
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@ -1446,6 +1446,7 @@ set(DISSECTOR_SRC
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${CMAKE_CURRENT_SOURCE_DIR}/packet-opsi.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-optommp.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-osc.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-oscore.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-osi-options.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-osi.c
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${CMAKE_CURRENT_SOURCE_DIR}/packet-ositp.c
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@ -1066,6 +1066,7 @@ DISSECTOR_SRC = \
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packet-opsi.c \
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packet-optommp.c \
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packet-osc.c \
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packet-oscore.c \
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packet-osi-options.c \
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packet-osi.c \
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packet-ositp.c \
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@ -0,0 +1,855 @@
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/* packet-oscore.c
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* Routines for Object Security for Constrained RESTful Environments dissection
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* Copyright 2017, Malisa Vucinic <malishav@gmail.com>
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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/*
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* draft-ietf-core-object-security-07
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*/
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#include <config.h>
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#include <epan/packet.h> /* Should be first Wireshark include (other than config.h) */
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#include <epan/expert.h> /* Include only as needed */
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#include <epan/uat.h>
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#include <epan/strutil.h>
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#include <epan/prefs.h> /* Include only as needed */
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#include <epan/to_str.h>
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#include <wsutil/wsgcrypt.h>
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#include "packet-ieee802154.h" /* We use CCM implementation available as part of 802.15.4 dissector */
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#include "packet-oscore.h"
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/* Prototypes */
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static guint oscore_alg_get_key_len(cose_aead_alg_t);
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static guint oscore_alg_get_iv_len(cose_aead_alg_t);
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static guint oscore_alg_get_tag_len(cose_aead_alg_t);
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static gboolean oscore_context_derive_params(oscore_context_t *);
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/* CBOR encoder prototypes */
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static guint8 cborencoder_put_text(guint8 *buffer, const char *text, guint8 text_len);
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static guint8 cborencoder_put_null(guint8 *buffer);
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static guint8 cborencoder_put_unsigned(guint8 *buffer, guint8 value);
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static guint8 cborencoder_put_bytes(guint8 *buffer, const guint8 *bytes, guint8 bytes_len);
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static guint8 cborencoder_put_array(guint8 *buffer, guint8 elements);
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/* (Required to prevent [-Wmissing-prototypes] warnings */
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void proto_reg_handoff_oscore(void);
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void proto_register_oscore(void);
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/* Initialize the protocol and registered fields */
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static int proto_oscore = -1;
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static int hf_oscore_coap_data = -1;
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static int hf_oscore_tag = -1;
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static expert_field ei_oscore_key_id_not_found = EI_INIT;
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static expert_field ei_oscore_partial_iv_not_found = EI_INIT;
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static expert_field ei_oscore_context_not_set = EI_INIT;
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static expert_field ei_oscore_message_too_small = EI_INIT;
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static expert_field ei_oscore_truncated = EI_INIT;
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static expert_field ei_oscore_tag_check_failed = EI_INIT;
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static expert_field ei_oscore_decrypt_error = EI_INIT;
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static expert_field ei_oscore_cbc_mac_failed = EI_INIT;
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static expert_field ei_oscore_piv_len_invalid = EI_INIT;
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/* Initialize the subtree pointers */
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static gint ett_oscore = -1;
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/* UAT variables */
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static uat_t *oscore_context_uat = NULL;
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static oscore_context_t *oscore_contexts = NULL;
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static guint num_oscore_contexts = 0;
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/* Enumeration for COSE algorithms used by OSCORE */
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static const value_string oscore_context_alg_vals[] = {
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{ COSE_AES_CCM_16_64_128, "AES-CCM-16-64-128 (CCM*)"},
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{ 0, NULL }
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};
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/* Field callbacks. */
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UAT_CSTRING_CB_DEF(oscore_context_uat, master_secret_prefs, oscore_context_t)
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UAT_CSTRING_CB_DEF(oscore_context_uat, master_salt_prefs, oscore_context_t)
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UAT_CSTRING_CB_DEF(oscore_context_uat, sender_id_prefs, oscore_context_t)
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UAT_CSTRING_CB_DEF(oscore_context_uat, recipient_id_prefs, oscore_context_t)
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UAT_VS_DEF(oscore_context_uat, algorithm, oscore_context_t, cose_aead_alg_t, COSE_AES_CCM_16_64_128, "AES-CCM-16-64-128 (CCM*)")
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#define OSCORE_MIN_LENGTH 9 /* 1 byte for code plus 8 bytes for shortest authentication tag */
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#define OSCORE_VERSION 1 /* draft-ietf-core-object-security-07 */
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#define TAG_MAX_LEN 16
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#define AES_128_BLOCK_LEN 16
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#define NONCE_MAX_LEN 13 /* longest nonce in RFC8152 is 13 bytes */
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#define OSCORE_PIV_MAX_LEN 5 /* upper bound specified in the draft */
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#define OSCORE_KID_MAX_LEN_CCM_STAR 7 /* upper bound on KID for AES-CCM-16-64-128 (CCM*) */
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#define OSCORE_KID_MAX_LEN OSCORE_KID_MAX_LEN_CCM_STAR /* upper bound on KID coming from the default algorithm implemented */
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/* Helper macros to correctly size the statically allocated buffers and verify if an overflow occured */
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#define OSCORE_INFO_MAX_LEN (1 + /* max return of cborencoder_put_array() */ \
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2 + OSCORE_KID_MAX_LEN + /* max 2 to encode length, KID following */ \
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2 + /* max return of cborencoder_put_unsigned() */ \
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2 + 3 + /* max 2 to encode length, "Key" following */ \
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2 /* max return of cborencoder_put_unsigned() */ )
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#define OSCORE_EXTERNAL_AAD_MAX_LEN (1 + /* max return of cborencoder_put_array() */ \
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2 + /* max return of cborencoder_put_unsigned() */ \
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2 + /* max return of cborencoder_put_unsigned() */ \
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2 + OSCORE_KID_MAX_LEN + /* max 2 to encode length, KID following */ \
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2 + OSCORE_PIV_MAX_LEN + /* max 2 to encode length, PIV following */ \
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1 + 0 /* 1 to encode length, 0 bytes following */ )
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#define OSCORE_AAD_MAX_LEN (1 + /* max return of cborencoder_put_array() */ \
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2 + 8 +/* max 2 to encode length, "Encrypt0" following */ \
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1 + 0 + /* 1 to encode length, 0 bytes following */ \
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2 + OSCORE_EXTERNAL_AAD_MAX_LEN /* max 2 to encode length, external_aad following */ )
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static void oscore_context_free_byte_arrays(oscore_context_t *rec) {
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if (rec->master_secret) {
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g_byte_array_free(rec->master_secret, TRUE);
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}
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if (rec->master_salt) {
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g_byte_array_free(rec->master_salt, TRUE);
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}
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if (rec->sender_id) {
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g_byte_array_free(rec->sender_id, TRUE);
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}
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if (rec->recipient_id) {
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g_byte_array_free(rec->recipient_id, TRUE);
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}
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if (rec->request_decryption_key) {
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g_byte_array_free(rec->request_decryption_key, TRUE);
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}
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if (rec->response_decryption_key) {
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g_byte_array_free(rec->response_decryption_key, TRUE);
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}
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if (rec->common_iv) {
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g_byte_array_free(rec->common_iv, TRUE);
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}
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}
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static void oscore_context_post_update_cb(void) {
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guint i;
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guint key_len;
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guint iv_len;
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for (i = 0; i < num_oscore_contexts; i++) {
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/* Make sure to free the memory if it was allocated previously. */
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oscore_context_free_byte_arrays(&oscore_contexts[i]);
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oscore_contexts[i].master_secret = g_byte_array_new();
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oscore_contexts[i].master_salt = g_byte_array_new();
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oscore_contexts[i].sender_id = g_byte_array_new();
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oscore_contexts[i].recipient_id = g_byte_array_new();
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/* Convert strings to byte arrays */
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hex_str_to_bytes(oscore_contexts[i].sender_id_prefs, oscore_contexts[i].sender_id, FALSE);
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hex_str_to_bytes(oscore_contexts[i].recipient_id_prefs, oscore_contexts[i].recipient_id, FALSE);
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hex_str_to_bytes(oscore_contexts[i].master_secret_prefs, oscore_contexts[i].master_secret, FALSE);
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hex_str_to_bytes(oscore_contexts[i].master_salt_prefs, oscore_contexts[i].master_salt, FALSE);
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/* Algorithm-dependent key and IV length */
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key_len = oscore_alg_get_key_len(oscore_contexts[i].algorithm);
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iv_len = oscore_alg_get_iv_len(oscore_contexts[i].algorithm);
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/* Allocate memory for derived parameters */
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oscore_contexts[i].request_decryption_key = g_byte_array_sized_new(key_len);
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oscore_contexts[i].response_decryption_key = g_byte_array_sized_new(key_len);
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oscore_contexts[i].common_iv = g_byte_array_sized_new(iv_len);
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oscore_context_derive_params(&oscore_contexts[i]);
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}
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}
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/* Check user input, do not allocate any memory */
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static gboolean oscore_context_update_cb(void *r, char **err) {
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oscore_context_t *rec = (oscore_context_t *) r;
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GByteArray *bytes; /* temp array to verify each parameter */
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bytes = g_byte_array_new();
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if (hex_str_to_bytes(rec->sender_id_prefs, bytes, FALSE) == FALSE) {
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*err = g_strdup("Sender ID is invalid.");
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g_byte_array_free(bytes, TRUE);
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return FALSE;
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}
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if (bytes->len == 0 || bytes->len > OSCORE_KID_MAX_LEN) {
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*err = g_strdup_printf("Sender ID is mandatory. Should be %u bytes or less.", OSCORE_KID_MAX_LEN);
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g_byte_array_free(bytes, TRUE);
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return FALSE;
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}
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if (hex_str_to_bytes(rec->recipient_id_prefs, bytes, FALSE) == FALSE) {
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*err = g_strdup("Recipient ID is invalid.");
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g_byte_array_free(bytes, TRUE);
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return FALSE;
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}
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if (bytes->len == 0 || bytes->len > OSCORE_KID_MAX_LEN) {
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*err = g_strdup_printf("Recipient ID is mandatory. Should be %u bytes or less.", OSCORE_KID_MAX_LEN);
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g_byte_array_free(bytes, TRUE);
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return FALSE;
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}
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if (hex_str_to_bytes(rec->master_secret_prefs, bytes, FALSE) == FALSE) {
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*err = g_strdup("Master Secret is invalid.");
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g_byte_array_free(bytes, TRUE);
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return FALSE;
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}
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/* No max length check on Master Secret. We use GByteArray to allocate memory
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* and pass it to the context derivation routine */
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if (bytes->len == 0) {
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*err = g_strdup("Master Secret is mandatory.");
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g_byte_array_free(bytes, TRUE);
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return FALSE;
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}
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if (hex_str_to_bytes(rec->master_salt_prefs, bytes, FALSE) == FALSE) {
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*err = g_strdup("Master Salt is invalid.");
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g_byte_array_free(bytes, TRUE);
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return FALSE;
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}
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/* No (max) length check on optional Master Salt. We use GByteArray to allocate memory
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* and pass it to the context derivation routine */
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g_byte_array_free(bytes, TRUE);
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return TRUE;
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}
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static void* oscore_context_copy_cb(void *n, const void *o, size_t siz _U_) {
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oscore_context_t *new_record = (oscore_context_t *) n;
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const oscore_context_t *old_record = (const oscore_context_t *) o;
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/* Pre-Shared Parameters */
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new_record->master_secret_prefs = g_strdup(old_record->master_secret_prefs);
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new_record->master_salt_prefs = g_strdup(old_record->master_salt_prefs);
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new_record->sender_id_prefs = g_strdup(old_record->sender_id_prefs);
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new_record->recipient_id_prefs = g_strdup(old_record->recipient_id_prefs);
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new_record->algorithm = old_record->algorithm;
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/* Initialize all to NULL, overwrite as needed */
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new_record->master_secret = NULL;
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new_record->master_salt = NULL;
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new_record->sender_id = NULL;
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new_record->recipient_id = NULL;
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new_record->request_decryption_key = NULL;
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new_record->response_decryption_key = NULL;
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new_record->common_iv = NULL;
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/* We rely on oscore_context_post_update_cb() to convert strings to GByteArrays and derive params */
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return new_record;
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}
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static void oscore_context_free_cb(void *r) {
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oscore_context_t *rec = (oscore_context_t *) r;
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/* User-configured strings */
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g_free(rec->master_secret_prefs);
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g_free(rec->master_salt_prefs);
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g_free(rec->sender_id_prefs);
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g_free(rec->recipient_id_prefs);
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/* Allocated byte arrays */
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oscore_context_free_byte_arrays(rec);
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}
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/* GByteArrays within the oscore_context_t object should be initialized before calling this function */
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static gboolean oscore_context_derive_params(oscore_context_t *context) {
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const char *iv_label = "IV";
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const char *key_label = "Key";
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guint8 prk[32]; /* Pseudo-random key from HKDF-Extract step. 32 for SHA256. */
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guint key_len;
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guint iv_len;
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guint8 info_buf[OSCORE_INFO_MAX_LEN];
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guint info_len;
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GByteArray *info;
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key_len = oscore_alg_get_key_len(context->algorithm);
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iv_len = oscore_alg_get_iv_len(context->algorithm);
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info = g_byte_array_new();
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/* Common HKDF-Extract step on master salt */
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hkdf_extract(GCRY_MD_SHA256, context->master_salt->data, context->master_salt->len, context->master_secret->data, context->master_secret->len, prk);
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/* Request Decryption Key */
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info_len = 0;
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info_len += cborencoder_put_array(&info_buf[info_len], 4);
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info_len += cborencoder_put_bytes(&info_buf[info_len], context->sender_id->data, context->sender_id->len);
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info_len += cborencoder_put_unsigned(&info_buf[info_len], context->algorithm);
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info_len += cborencoder_put_text(&info_buf[info_len], key_label, 3);
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info_len += cborencoder_put_unsigned(&info_buf[info_len], key_len);
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/* sender_id->len comes from user input, it is validated by the UAT callback and the max length is accounted for
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* in OSCORE_INFO_MAX_LEN */
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DISSECTOR_ASSERT(info_len < OSCORE_INFO_MAX_LEN);
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g_byte_array_append(info, info_buf, info_len);
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g_byte_array_set_size(context->request_decryption_key, key_len);
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hkdf_expand(GCRY_MD_SHA256, prk, sizeof(prk), info->data, info->len, context->request_decryption_key->data, key_len); /* 32 for SHA256 */
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/* Response Decryption Key */
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info_len = 0;
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g_byte_array_set_size(info, 0);
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info_len += cborencoder_put_array(&info_buf[info_len], 4);
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info_len += cborencoder_put_bytes(&info_buf[info_len], context->recipient_id->data, context->recipient_id->len);
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info_len += cborencoder_put_unsigned(&info_buf[info_len], context->algorithm);
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info_len += cborencoder_put_text(&info_buf[info_len], key_label, 3);
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info_len += cborencoder_put_unsigned(&info_buf[info_len], key_len);
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/* recipient_id->len comes from user input, it is validated by the UAT callback and the max length is accounted for
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* in OSCORE_INFO_MAX_LEN */
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DISSECTOR_ASSERT(info_len < OSCORE_INFO_MAX_LEN);
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g_byte_array_append(info, info_buf, info_len);
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g_byte_array_set_size(context->response_decryption_key, key_len);
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hkdf_expand(GCRY_MD_SHA256, prk, sizeof(prk), info->data, info->len, context->response_decryption_key->data, key_len); /* 32 for SHA256 */
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/* Common IV */
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info_len = 0;
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g_byte_array_set_size(info, 0);
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info_len += cborencoder_put_array(&info_buf[info_len], 4);
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info_len += cborencoder_put_null(&info_buf[info_len]);
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info_len += cborencoder_put_unsigned(&info_buf[info_len], context->algorithm);
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info_len += cborencoder_put_text(&info_buf[info_len], iv_label, 2);
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info_len += cborencoder_put_unsigned(&info_buf[info_len], iv_len);
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/* all static lengths, accounted for in OSCORE_INFO_MAX_LEN */
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DISSECTOR_ASSERT(info_len < OSCORE_INFO_MAX_LEN);
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g_byte_array_append(info, info_buf, info_len);
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g_byte_array_set_size(context->common_iv, iv_len);
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hkdf_expand(GCRY_MD_SHA256, prk, sizeof(prk), info->data, info->len, context->common_iv->data, iv_len); /* 32 for SHA256 */
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g_byte_array_free(info, TRUE);
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return TRUE;
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}
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|
||||
static guint oscore_alg_get_key_len(cose_aead_alg_t algorithm) {
|
||||
switch(algorithm) {
|
||||
case COSE_AES_CCM_16_64_128:
|
||||
return 16; /* RFC8152 */
|
||||
/* unsupported */
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static guint oscore_alg_get_tag_len(cose_aead_alg_t algorithm) {
|
||||
switch(algorithm) {
|
||||
case COSE_AES_CCM_16_64_128:
|
||||
return 8; /* RFC8152 */
|
||||
/* unsupported */
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static guint oscore_alg_get_iv_len(cose_aead_alg_t algorithm) {
|
||||
switch(algorithm) {
|
||||
case COSE_AES_CCM_16_64_128:
|
||||
return 13; /* RFC8152 */
|
||||
/* unsupported */
|
||||
default:
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static oscore_context_t * oscore_find_context(oscore_info_t *info) {
|
||||
guint i;
|
||||
|
||||
for (i = 0; i < num_oscore_contexts; i++) {
|
||||
if (oscore_contexts[i].sender_id_prefs && info->kid) {
|
||||
if ((info->kid_len == oscore_contexts[i].sender_id->len) &&
|
||||
memcmp(oscore_contexts[i].sender_id->data, info->kid, info->kid_len) == 0) {
|
||||
return &oscore_contexts[i];
|
||||
}
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/**
|
||||
CBOR encoding functions needed to construct HKDF info and aad.
|
||||
Author Martin Gunnarsson <martin.gunnarsson@ri.se>
|
||||
Modified by Malisa Vucinic <malishav@gmail.com>
|
||||
*/
|
||||
static guint8
|
||||
cborencoder_put_text(guint8 *buffer, const char *text, guint8 text_len) {
|
||||
guint8 ret = 0;
|
||||
|
||||
if(text_len > 23 ){
|
||||
buffer[ret++] = 0x78;
|
||||
buffer[ret++] = text_len;
|
||||
} else {
|
||||
buffer[ret++] = (0x60 | text_len);
|
||||
}
|
||||
|
||||
if (text) {
|
||||
memcpy(&buffer[ret], text, text_len);
|
||||
ret += text_len;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static guint8
|
||||
cborencoder_put_array(guint8 *buffer, guint8 elements) {
|
||||
guint8 ret = 0;
|
||||
|
||||
if(elements > 15){
|
||||
return 0;
|
||||
}
|
||||
|
||||
buffer[ret++] = (0x80 | elements);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static guint8
|
||||
cborencoder_put_bytes(guint8 *buffer, const guint8 *bytes, guint8 bytes_len) {
|
||||
guint8 ret = 0;
|
||||
|
||||
if(bytes_len > 23){
|
||||
buffer[ret++] = 0x58;
|
||||
buffer[ret++] = bytes_len;
|
||||
} else {
|
||||
buffer[ret++] = (0x40 | bytes_len);
|
||||
}
|
||||
|
||||
if (bytes){
|
||||
memcpy(&buffer[ret], bytes, bytes_len);
|
||||
ret += bytes_len;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static guint8
|
||||
cborencoder_put_unsigned(guint8 *buffer, guint8 value) {
|
||||
guint8 ret = 0;
|
||||
|
||||
if(value > 0x17 ){
|
||||
buffer[ret++] = 0x18;
|
||||
buffer[ret++] = value;
|
||||
return ret;
|
||||
}
|
||||
|
||||
buffer[ret++] = value;
|
||||
return ret;
|
||||
}
|
||||
|
||||
static guint8
|
||||
cborencoder_put_null(guint8 *buffer) {
|
||||
guint8 ret = 0;
|
||||
|
||||
buffer[ret++] = 0xf6;
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* out should hold NONCE_MAX_LEN bytes at most */
|
||||
static void
|
||||
oscore_create_nonce(guint8 *out,
|
||||
oscore_context_t *context,
|
||||
oscore_info_t *info) {
|
||||
|
||||
guint i = 0;
|
||||
gchar piv_extended[NONCE_MAX_LEN] = { 0 };
|
||||
guint nonce_len;
|
||||
|
||||
DISSECTOR_ASSERT(out != NULL);
|
||||
DISSECTOR_ASSERT(context != NULL);
|
||||
DISSECTOR_ASSERT(info != NULL);
|
||||
|
||||
nonce_len = oscore_alg_get_iv_len(context->algorithm);
|
||||
DISSECTOR_ASSERT(nonce_len <= NONCE_MAX_LEN);
|
||||
|
||||
/* AEAD nonce is the XOR of Common IV left-padded to AEAD nonce length and the concatenation of:
|
||||
* Step 3: Size of Sender ID (1 byte),
|
||||
* Step 2: Sender ID (left-padded to "AEAD nonce length - 6 bytes"),
|
||||
* Step 1: Partial IV (left-padded to OSCORE_PIV_MAX_LEN bytes).
|
||||
*/
|
||||
|
||||
/* Step 1 */
|
||||
DISSECTOR_ASSERT(info->piv_len <= OSCORE_PIV_MAX_LEN);
|
||||
memcpy(&piv_extended[nonce_len - info->piv_len], info->piv, info->piv_len);
|
||||
|
||||
/* Step 2 */
|
||||
DISSECTOR_ASSERT(context->sender_id->len <= nonce_len - 6);
|
||||
memcpy(&piv_extended[nonce_len - OSCORE_PIV_MAX_LEN - context->sender_id->len], context->sender_id->data, context->sender_id->len);
|
||||
|
||||
/* Step 3 */
|
||||
piv_extended[0] = context->sender_id->len;
|
||||
|
||||
/* Now XOR with Common IV */
|
||||
for (i = 0; i < nonce_len; i++) {
|
||||
out[i] = piv_extended[i] ^ context->common_iv->data[i];
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static oscore_decryption_status_t
|
||||
oscore_decrypt_and_verify(tvbuff_t *tvb_ciphertext,
|
||||
packet_info *pinfo,
|
||||
gint *offset,
|
||||
proto_tree *tree,
|
||||
oscore_context_t *context,
|
||||
oscore_info_t *info,
|
||||
tvbuff_t **tvb_plaintext) {
|
||||
|
||||
gboolean have_tag = FALSE;
|
||||
guint8 nonce[NONCE_MAX_LEN];
|
||||
guint8 tmp[AES_128_BLOCK_LEN];
|
||||
guint8 *text;
|
||||
guint8 rx_tag[TAG_MAX_LEN];
|
||||
guint tag_len = 0;
|
||||
guint8 gen_tag[TAG_MAX_LEN];
|
||||
guint8 external_aad[OSCORE_EXTERNAL_AAD_MAX_LEN];
|
||||
guint8 external_aad_len = 0;
|
||||
guint8 aad[OSCORE_AAD_MAX_LEN];
|
||||
guint8 aad_len = 0;
|
||||
gint ciphertext_captured_len;
|
||||
gint ciphertext_reported_len;
|
||||
const char *encrypt0 = "Encrypt0";
|
||||
proto_item *item = NULL;
|
||||
|
||||
tag_len = oscore_alg_get_tag_len(context->algorithm);
|
||||
|
||||
ciphertext_reported_len = tvb_reported_length_remaining(tvb_ciphertext, *offset + tag_len);
|
||||
|
||||
if (ciphertext_reported_len == 0) {
|
||||
return STATUS_ERROR_MESSAGE_TOO_SMALL;
|
||||
}
|
||||
|
||||
/* Check if the payload is truncated. */
|
||||
if (tvb_bytes_exist(tvb_ciphertext, *offset, ciphertext_reported_len)) {
|
||||
ciphertext_captured_len = ciphertext_reported_len;
|
||||
}
|
||||
else {
|
||||
ciphertext_captured_len = tvb_captured_length_remaining(tvb_ciphertext, *offset);
|
||||
}
|
||||
|
||||
/* Check if the tag is present in the captured data. */
|
||||
have_tag = tvb_bytes_exist(tvb_ciphertext, *offset + ciphertext_reported_len, tag_len);
|
||||
if (have_tag) {
|
||||
DISSECTOR_ASSERT(tag_len <= sizeof(rx_tag));
|
||||
tvb_memcpy(tvb_ciphertext, rx_tag, *offset + ciphertext_reported_len, tag_len);
|
||||
}
|
||||
|
||||
/* Create nonce to use for decryption and authenticity check */
|
||||
oscore_create_nonce(nonce, context, info);
|
||||
|
||||
/*
|
||||
* Create the CCM* initial block for decryption (Adata=0, M=0, counter=0).
|
||||
* XXX: This only handles AES-CCM-16-64-128, add generic algorithm handling
|
||||
* */
|
||||
ccm_init_block(tmp, FALSE, 0, 0, 0, 0, 0, nonce);
|
||||
|
||||
/*
|
||||
* Make a copy of the ciphertext in heap memory.
|
||||
*
|
||||
* We will decrypt the message in-place and then use the buffer as the
|
||||
* real data for the new tvb.
|
||||
*/
|
||||
text = (guint8 *)tvb_memdup(pinfo->pool, tvb_ciphertext, *offset, ciphertext_captured_len);
|
||||
|
||||
/*
|
||||
* Perform CTR-mode transformation and decrypt the tag.
|
||||
* XXX: This only handles AES-CCM-16-64-128, add generic algorithm handling
|
||||
* */
|
||||
if(ccm_ctr_encrypt(context->request_decryption_key->data, tmp, rx_tag, text, ciphertext_captured_len) == FALSE) {
|
||||
return STATUS_ERROR_DECRYPT_FAILED;
|
||||
}
|
||||
|
||||
/* Create a tvbuff for the plaintext. */
|
||||
*tvb_plaintext = tvb_new_real_data(text, ciphertext_captured_len, ciphertext_reported_len);
|
||||
tvb_set_child_real_data_tvbuff(tvb_ciphertext, *tvb_plaintext);
|
||||
add_new_data_source(pinfo, *tvb_plaintext, "Decrypted OSCORE");
|
||||
|
||||
if (have_tag) {
|
||||
/* Construct external_aad to be able to verify the tag */
|
||||
|
||||
/* Note that OSCORE_EXTERNAL_AAD_MAX_LEN calculation depends on the following construct.
|
||||
* If this is updated - e.g. due to spec changes, added support for Class I options, or added
|
||||
* support for other algorithms which would change max length of KID - do not forget to update the macro.
|
||||
* */
|
||||
external_aad_len += cborencoder_put_array(&external_aad[external_aad_len], 5); /* 5 elements in the array */
|
||||
external_aad_len += cborencoder_put_unsigned(&external_aad[external_aad_len], OSCORE_VERSION);
|
||||
external_aad_len += cborencoder_put_unsigned(&external_aad[external_aad_len], context->algorithm);
|
||||
external_aad_len += cborencoder_put_bytes(&external_aad[external_aad_len], info->kid, info->kid_len);
|
||||
external_aad_len += cborencoder_put_bytes(&external_aad[external_aad_len], info->piv, info->piv_len);
|
||||
external_aad_len += cborencoder_put_bytes(&external_aad[external_aad_len], NULL, 0); // Class I options not implemented/standardized yet
|
||||
|
||||
/* info->kid_len and info->piv_len come from the lower layer, other parameters are local.
|
||||
* we end up here only if kid_len is matched to the one from the configured context through oscore_find_context()
|
||||
* and piv_len is verified in the main dissection routine */
|
||||
DISSECTOR_ASSERT(external_aad_len < OSCORE_EXTERNAL_AAD_MAX_LEN);
|
||||
|
||||
/* Note that OSCORE_AAD_MAX_LEN calculation depends on the following construct.
|
||||
* If the construct below is modified, do not forget to update the macro.
|
||||
* */
|
||||
aad_len += cborencoder_put_array(&aad[aad_len], 3); // COSE Encrypt0 structure with 3 elements
|
||||
aad_len += cborencoder_put_text(&aad[aad_len], encrypt0, 8); /* Text string "Encrypt0" */
|
||||
aad_len += cborencoder_put_bytes(&aad[aad_len], NULL, 0); /* Empty byte string */
|
||||
aad_len += cborencoder_put_bytes(&aad[aad_len], external_aad, external_aad_len); /* OSCORE external_aad */
|
||||
|
||||
DISSECTOR_ASSERT(aad_len < OSCORE_AAD_MAX_LEN);
|
||||
|
||||
/* Compute CBC-MAC authentication tag. */
|
||||
|
||||
/*
|
||||
* Create the CCM* initial block for authentication (Adata!=0, M!=0, counter=l(m)).
|
||||
* XXX: This only handles AES-CCM-16-64-128, add generic algorithm handling
|
||||
* */
|
||||
DISSECTOR_ASSERT(tag_len <= sizeof(gen_tag));
|
||||
ccm_init_block(tmp, TRUE, tag_len, 0, 0, 0, ciphertext_captured_len, nonce);
|
||||
/* text is already a raw buffer containing the plaintext since we just decrypted it in-place */
|
||||
if (!ccm_cbc_mac(context->request_decryption_key->data, tmp, aad, aad_len, text, ciphertext_captured_len, gen_tag)) {
|
||||
return STATUS_ERROR_CBCMAC_FAILED;
|
||||
}
|
||||
/* Compare the received tag with the one we generated. */
|
||||
else if (memcmp(gen_tag, rx_tag, tag_len) != 0) {
|
||||
return STATUS_ERROR_TAG_CHECK_FAILED;
|
||||
}
|
||||
|
||||
/* Display the tag. */
|
||||
if (tag_len) {
|
||||
item = proto_tree_add_bytes(tree, hf_oscore_tag, tvb_ciphertext, ciphertext_captured_len, tag_len, rx_tag);
|
||||
PROTO_ITEM_SET_GENERATED(item);
|
||||
}
|
||||
|
||||
return STATUS_SUCCESS_DECRYPTED_TAG_CHECKED;
|
||||
} /* if (have_tag) */
|
||||
|
||||
return STATUS_SUCCESS_DECRYPTED_TAG_TRUNCATED;
|
||||
}
|
||||
|
||||
/* Code to actually dissect the packets */
|
||||
static int
|
||||
oscore_dissect(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
|
||||
void *data _U_)
|
||||
{
|
||||
/* Set up structures needed to add the protocol subtree and manage it */
|
||||
proto_item *ti;
|
||||
proto_tree *oscore_tree;
|
||||
/* Other misc. local variables. */
|
||||
guint offset = 0;
|
||||
oscore_info_t *info = (oscore_info_t *) data;
|
||||
oscore_context_t *context = NULL;
|
||||
oscore_decryption_status_t status;
|
||||
tvbuff_t *tvb_decrypted = NULL;
|
||||
|
||||
/* Check that the packet is long enough for it to belong to us. */
|
||||
if (tvb_reported_length(tvb) < OSCORE_MIN_LENGTH) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* Set the Protocol column to the constant string of oscore */
|
||||
col_set_str(pinfo->cinfo, COL_PROTOCOL, "OSCORE");
|
||||
|
||||
/* create display subtree for the protocol */
|
||||
ti = proto_tree_add_item(tree, proto_oscore, tvb, 0, -1, ENC_NA);
|
||||
|
||||
oscore_tree = proto_item_add_subtree(ti, ett_oscore);
|
||||
|
||||
if (info->kid == NULL) {
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_key_id_not_found);
|
||||
return tvb_reported_length(tvb);
|
||||
}
|
||||
|
||||
if (info->piv == NULL) {
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_partial_iv_not_found);
|
||||
return tvb_reported_length(tvb);
|
||||
}
|
||||
|
||||
if ((context = oscore_find_context(info)) == NULL) {
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_context_not_set);
|
||||
return tvb_reported_length(tvb);
|
||||
}
|
||||
|
||||
if (info->piv_len > OSCORE_PIV_MAX_LEN) {
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_piv_len_invalid);
|
||||
return tvb_reported_length(tvb);
|
||||
}
|
||||
|
||||
status = oscore_decrypt_and_verify(tvb, pinfo, &offset, oscore_tree, context, info, &tvb_decrypted);
|
||||
|
||||
switch (status) {
|
||||
case STATUS_ERROR_DECRYPT_FAILED:
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_decrypt_error);
|
||||
return tvb_reported_length(tvb);
|
||||
case STATUS_ERROR_CBCMAC_FAILED:
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_cbc_mac_failed);
|
||||
return tvb_reported_length(tvb);
|
||||
case STATUS_ERROR_TAG_CHECK_FAILED:
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_tag_check_failed);
|
||||
return tvb_reported_length(tvb);
|
||||
case STATUS_ERROR_MESSAGE_TOO_SMALL:
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_message_too_small);
|
||||
return tvb_reported_length(tvb);
|
||||
case STATUS_SUCCESS_DECRYPTED_TAG_TRUNCATED:
|
||||
expert_add_info(pinfo, oscore_tree, &ei_oscore_truncated);
|
||||
/* do not return, attempt dissection */
|
||||
break;
|
||||
case STATUS_SUCCESS_DECRYPTED_TAG_CHECKED:
|
||||
break;
|
||||
}
|
||||
|
||||
DISSECTOR_ASSERT(tvb_decrypted);
|
||||
|
||||
proto_tree_add_item(oscore_tree, hf_oscore_coap_data, tvb_decrypted, 0, tvb_reported_length(tvb_decrypted), ENC_NA);
|
||||
|
||||
return tvb_captured_length(tvb);
|
||||
}
|
||||
|
||||
/* Register the protocol with Wireshark.
|
||||
*
|
||||
* This format is require because a script is used to build the C function that
|
||||
* calls all the protocol registration.
|
||||
*/
|
||||
void
|
||||
proto_register_oscore(void)
|
||||
{
|
||||
module_t *oscore_module;
|
||||
expert_module_t *expert_oscore;
|
||||
|
||||
static hf_register_info hf[] = {
|
||||
{ &hf_oscore_coap_data,
|
||||
{ "Decrypted CoAP Data", "oscore.coap_data",
|
||||
FT_BYTES, BASE_NONE, NULL, 0x00,
|
||||
NULL, HFILL }
|
||||
},
|
||||
{ &hf_oscore_tag,
|
||||
{ "Decrypted Authentication Tag", "oscore.tag", FT_BYTES, BASE_NONE, NULL, 0x0,
|
||||
NULL, HFILL }
|
||||
},
|
||||
};
|
||||
|
||||
/* Setup protocol subtree array */
|
||||
static gint *ett[] = {
|
||||
&ett_oscore
|
||||
};
|
||||
|
||||
/* Setup protocol expert items */
|
||||
static ei_register_info ei[] = {
|
||||
{ &ei_oscore_key_id_not_found,
|
||||
{ "oscore.key_id_not_found", PI_UNDECODED, PI_WARN,
|
||||
"Key ID not found - can't decrypt", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_partial_iv_not_found,
|
||||
{ "oscore.partial_iv_not_found", PI_UNDECODED, PI_WARN,
|
||||
"Partial IV not found - can't decrypt", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_context_not_set,
|
||||
{ "oscore.context_not_set", PI_UNDECODED, PI_WARN,
|
||||
"Security context not set - can't decrypt", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_message_too_small,
|
||||
{ "oscore.message_too_small", PI_UNDECODED, PI_WARN,
|
||||
"Message too small", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_truncated,
|
||||
{ "oscore.truncated", PI_UNDECODED, PI_WARN,
|
||||
"Message truncated, cannot verify authentication tag, but decryption is attempted", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_cbc_mac_failed,
|
||||
{ "oscore.cbc_mac_failed", PI_UNDECODED, PI_WARN,
|
||||
"Call to CBC-MAC failed", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_tag_check_failed,
|
||||
{ "oscore.tag_check_failed", PI_UNDECODED, PI_WARN,
|
||||
"Authentication tag check failed", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_decrypt_error,
|
||||
{ "oscore.decrypt_error", PI_UNDECODED, PI_WARN,
|
||||
"Decryption error", EXPFILL
|
||||
}
|
||||
},
|
||||
{ &ei_oscore_piv_len_invalid,
|
||||
{ "oscore.piv_len_invalid", PI_UNDECODED, PI_WARN,
|
||||
"Partial IV length from the lower layer is invalid", EXPFILL
|
||||
}
|
||||
},
|
||||
};
|
||||
|
||||
static uat_field_t oscore_context_uat_flds[] = {
|
||||
UAT_FLD_CSTRING(oscore_context_uat,sender_id_prefs,"Sender ID",
|
||||
"Sender ID as HEX string. Should be 7 bytes or less. Mandatory."),
|
||||
UAT_FLD_CSTRING(oscore_context_uat,recipient_id_prefs,"Recipient ID",
|
||||
"Recipient ID as HEX string. Should be 7 bytes or less. Mandatory."),
|
||||
UAT_FLD_CSTRING(oscore_context_uat,master_secret_prefs,"Master Secret",
|
||||
"Master Secret as HEX string. Mandatory."),
|
||||
UAT_FLD_CSTRING(oscore_context_uat,master_salt_prefs,"Master Salt",
|
||||
"Master Salt as HEX string. Optional."),
|
||||
UAT_FLD_VS(oscore_context_uat, algorithm, "Algorithm", oscore_context_alg_vals, "Decryption algorithm."),
|
||||
UAT_END_FIELDS
|
||||
};
|
||||
|
||||
/* Register the protocol name and description */
|
||||
proto_oscore = proto_register_protocol("Object Security for Constrained RESTful Environments",
|
||||
"OSCORE", "oscore");
|
||||
|
||||
/* Required function calls to register the header fields and subtrees */
|
||||
proto_register_field_array(proto_oscore, hf, array_length(hf));
|
||||
proto_register_subtree_array(ett, array_length(ett));
|
||||
|
||||
/* Required function calls to register expert items */
|
||||
expert_oscore = expert_register_protocol(proto_oscore);
|
||||
expert_register_field_array(expert_oscore, ei, array_length(ei));
|
||||
|
||||
oscore_module = prefs_register_protocol(proto_oscore, NULL);
|
||||
|
||||
/* Create a UAT for security context management. */
|
||||
oscore_context_uat = uat_new("Security Contexts",
|
||||
sizeof(oscore_context_t), /* record size */
|
||||
"oscore_contexts", /* filename */
|
||||
TRUE, /* from_profile */
|
||||
&oscore_contexts, /* data_ptr */
|
||||
&num_oscore_contexts, /* numitems_ptr */
|
||||
UAT_AFFECTS_DISSECTION, /* affects dissection of packets, but not set of named fields */
|
||||
NULL, /* help */
|
||||
oscore_context_copy_cb, /* copy callback */
|
||||
oscore_context_update_cb, /* update callback */
|
||||
oscore_context_free_cb, /* free callback */
|
||||
oscore_context_post_update_cb, /* post update callback */
|
||||
NULL, /* reset callback */
|
||||
oscore_context_uat_flds); /* UAT field definitions */
|
||||
|
||||
prefs_register_uat_preference(oscore_module, "contexts",
|
||||
"Security Contexts",
|
||||
"Security context configuration data",
|
||||
oscore_context_uat);
|
||||
|
||||
register_dissector("oscore", oscore_dissect, proto_oscore);
|
||||
}
|
||||
|
||||
/*
|
||||
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
||||
*
|
||||
* Local variables:
|
||||
* c-basic-offset: 4
|
||||
* tab-width: 8
|
||||
* indent-tabs-mode: nil
|
||||
* End:
|
||||
*
|
||||
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
||||
* :indentSize=4:tabSize=8:noTabs=true:
|
||||
*/
|
||||
|
|
@ -0,0 +1,72 @@
|
|||
/* packet-oscore.h
|
||||
*
|
||||
* Wireshark - Network traffic analyzer
|
||||
* By Gerald Combs <gerald@wireshark.org>
|
||||
* Copyright 1998 Gerald Combs
|
||||
*
|
||||
* SPDX-License-Identifier: GPL-2.0-or-later
|
||||
*/
|
||||
|
||||
#ifndef __PACKET_OSCORE_H__
|
||||
#define __PACKET_OSCORE_H__
|
||||
|
||||
/* OSCORE uses AEAD algorithms defined in RFC8152 (COSE)
|
||||
* We only implement the default algorithm which corresponds to CCM*
|
||||
* */
|
||||
typedef enum {
|
||||
COSE_AES_CCM_16_64_128 = 10,
|
||||
} cose_aead_alg_t;
|
||||
|
||||
typedef enum {
|
||||
STATUS_ERROR_DECRYPT_FAILED = 0,
|
||||
STATUS_ERROR_CBCMAC_FAILED,
|
||||
STATUS_ERROR_TAG_CHECK_FAILED,
|
||||
STATUS_ERROR_MESSAGE_TOO_SMALL,
|
||||
STATUS_SUCCESS_DECRYPTED_TAG_TRUNCATED,
|
||||
STATUS_SUCCESS_DECRYPTED_TAG_CHECKED,
|
||||
} oscore_decryption_status_t;
|
||||
|
||||
/* Structure containing information regarding all necessary OSCORE message fields. */
|
||||
typedef struct oscore_context {
|
||||
/* Pre-Shared Parameters as Strings */
|
||||
gchar *master_secret_prefs;
|
||||
gchar *master_salt_prefs;
|
||||
gchar *sender_id_prefs;
|
||||
gchar *recipient_id_prefs;
|
||||
cose_aead_alg_t algorithm;
|
||||
/* Pre-Shared Parameters as Byte Arrays */
|
||||
GByteArray *master_secret;
|
||||
GByteArray *master_salt;
|
||||
GByteArray *sender_id;
|
||||
GByteArray *recipient_id;
|
||||
/* Derived Parameters */
|
||||
GByteArray *request_decryption_key;
|
||||
GByteArray *response_decryption_key;
|
||||
GByteArray *common_iv; /* IV used to generate the nonce */
|
||||
} oscore_context_t;
|
||||
|
||||
/* Data from the lower layer (CoAP/HTTP) necessary for OSCORE to decrypt the packet */
|
||||
typedef struct oscore_info {
|
||||
guint8 *kid;
|
||||
guint8 kid_len;
|
||||
guint8 *kid_context;
|
||||
guint8 kid_context_len;
|
||||
guint8 *piv;
|
||||
guint8 piv_len;
|
||||
gboolean response;
|
||||
} oscore_info_t;
|
||||
|
||||
#endif /* __PACKET_OSCORE_H__ */
|
||||
|
||||
/*
|
||||
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
||||
*
|
||||
* Local variables:
|
||||
* c-basic-offset: 4
|
||||
* tab-width: 8
|
||||
* indent-tabs-mode: nil
|
||||
* End:
|
||||
*
|
||||
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
||||
* :indentSize=4:tabSize=8:noTabs=true:
|
||||
*/
|
||||
Loading…
Reference in New Issue