forked from osmocom/wireshark
WOWW: Add better support out of order parsing
This commit is contained in:
parent
3f4ac5539b
commit
b9a6268819
|
@ -1957,10 +1957,10 @@ deduce_header(guint8 session_key[WOWW_SESSION_KEY_LENGTH],
|
|||
static gboolean
|
||||
session_key_is_fully_deduced(const bool known_indices[WOWW_SESSION_KEY_LENGTH],
|
||||
guint8 header_length,
|
||||
WowwParticipant_t* participant) {
|
||||
guint8 start_index) {
|
||||
gboolean fully_deduced = true;
|
||||
for (guint8 i = 0; i < header_length; i++) {
|
||||
if (!known_indices[(participant->index + i) % WOWW_SESSION_KEY_LENGTH]) {
|
||||
if (!known_indices[(start_index + i) % WOWW_SESSION_KEY_LENGTH]) {
|
||||
fully_deduced = false;
|
||||
}
|
||||
}
|
||||
|
@ -2002,39 +2002,57 @@ handle_packet_header(packet_info* pinfo,
|
|||
return decrypted_header;
|
||||
}
|
||||
|
||||
// If we aren't ready to fully decrypt this header yet
|
||||
if (!session_key_is_fully_deduced(wowwConversation->known_indices, headerSize, participant)) {
|
||||
// Packet isn't decrypted, make sure to do it later
|
||||
guint8 *array_index = wmem_alloc(wmem_file_scope(), 2);
|
||||
array_index[0] = participant->index;
|
||||
array_index[1] = participant->last_encrypted_value;
|
||||
wmem_tree_insert32(wowwConversation->headers_need_decryption, pinfo->num, array_index);
|
||||
guint8* original_header_values = wmem_tree_lookup32(wowwConversation->headers_need_decryption, pinfo->num);
|
||||
|
||||
if (WOWW_CLIENT_TO_SERVER) {
|
||||
deduce_header(wowwConversation->session_key, wowwConversation->known_indices, header, participant);
|
||||
} else {
|
||||
// Skip the packet, but remember to acknowledge that values changed
|
||||
participant->index = (participant->index + headerSize) % WOWW_SESSION_KEY_LENGTH;
|
||||
participant->last_encrypted_value = header[headerSize - 1];
|
||||
if (original_header_values) {
|
||||
// Header has been seen before
|
||||
|
||||
// Original value will need to be used
|
||||
if (!session_key_is_fully_deduced(wowwConversation->known_indices, headerSize, original_header_values[0])) {
|
||||
// Not ready yet
|
||||
return NULL;
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
// Header can be decrypted and added to map
|
||||
|
||||
guint8* old_index = wmem_tree_lookup32(wowwConversation->headers_need_decryption, pinfo->num);
|
||||
}
|
||||
else {
|
||||
// Header has not been seen before
|
||||
if (!session_key_is_fully_deduced(wowwConversation->known_indices, headerSize, participant->index)) {
|
||||
// Packet isn't decrypted, make sure to do it later
|
||||
guint8 *array_index = wmem_alloc(wmem_file_scope(), 2);
|
||||
array_index[0] = participant->index;
|
||||
array_index[1] = participant->last_encrypted_value;
|
||||
wmem_tree_insert32(wowwConversation->headers_need_decryption, pinfo->num, array_index);
|
||||
|
||||
if (WOWW_CLIENT_TO_SERVER) {
|
||||
deduce_header(wowwConversation->session_key, wowwConversation->known_indices, header, participant);
|
||||
} else {
|
||||
// Skip the packet, but remember to acknowledge that values changed
|
||||
participant->index = (participant->index + headerSize) % WOWW_SESSION_KEY_LENGTH;
|
||||
participant->last_encrypted_value = header[headerSize - 1];
|
||||
}
|
||||
|
||||
return NULL;
|
||||
}
|
||||
else {
|
||||
// Header can be decrypted and added to map
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
guint8 new_index = participant->index;
|
||||
guint8 new_last_encrypted = participant->last_encrypted_value;
|
||||
|
||||
// If this is an out of order packet we must use the original state
|
||||
if (old_index) {
|
||||
participant->index = old_index[0];
|
||||
participant->last_encrypted_value = old_index[1];
|
||||
if (original_header_values) {
|
||||
participant->index = original_header_values[0];
|
||||
participant->last_encrypted_value = original_header_values[1];
|
||||
}
|
||||
|
||||
decrypted_header = get_decrypted_header(wowwConversation->session_key, participant, header, headerSize);
|
||||
|
||||
if (old_index) {
|
||||
if (original_header_values) {
|
||||
participant->index = new_index;
|
||||
participant->last_encrypted_value = new_last_encrypted;
|
||||
|
||||
|
|
Loading…
Reference in New Issue