-
Notifications
You must be signed in to change notification settings - Fork 892
Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
Signed-off-by: lns <[email protected]>
- Loading branch information
Showing
9 changed files
with
255 additions
and
7 deletions.
There are no files selected for viewing
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,210 @@ | ||
| /* | ||
| * collectd.c | ||
| * | ||
| * Copyright (C) 2022 - ntop.org | ||
| * | ||
| * nDPI is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU Lesser General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * nDPI is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public License | ||
| * along with nDPI. If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| */ | ||
|
|
||
|
|
||
| #include "ndpi_protocol_ids.h" | ||
|
|
||
| #define NDPI_CURRENT_PROTO NDPI_PROTOCOL_COLLECTD | ||
|
|
||
| #include "ndpi_api.h" | ||
|
|
||
| #define COLLECTD_MIN_BLOCKS_REQUIRED 3 | ||
| #define COLLECTD_MAX_BLOCKS_TO_DISSECT 5 | ||
|
|
||
| #define COLLECTD_ENCR_AES256_MIN_BLOCK_SIZE 6 | ||
| #define COLLECTD_ENCR_AES256_IV_SIZE 16 | ||
|
|
||
| enum collectd_type { | ||
| COLLECTD_TYPE_HOST = 0x0000, | ||
| COLLECTD_TYPE_TIME = 0x0001, | ||
| COLLECTD_TYPE_TIME_HR = 0x0008, | ||
| COLLECTD_TYPE_PLUGIN = 0x0002, | ||
| COLLECTD_TYPE_PLUGIN_INSTANCE = 0x0003, | ||
| COLLECTD_TYPE_TYPE = 0x0004, | ||
| COLLECTD_TYPE_TYPE_INSTANCE = 0x0005, | ||
| COLLECTD_TYPE_VALUES = 0x0006, | ||
| COLLECTD_TYPE_INTERVAL = 0x0007, | ||
| COLLECTD_TYPE_INTERVAL_HR = 0x0009, | ||
| COLLECTD_TYPE_MESSAGE = 0x0100, | ||
| COLLECTD_TYPE_SEVERITY = 0x0101, | ||
| COLLECTD_TYPE_SIGN_SHA256 = 0x0200, | ||
| COLELCTD_TYPE_ENCR_AES256 = 0x0210, | ||
| }; | ||
|
|
||
| static u_int16_t const collectd_types[] = { | ||
| COLLECTD_TYPE_HOST, COLLECTD_TYPE_TIME, COLLECTD_TYPE_TIME_HR, COLLECTD_TYPE_PLUGIN, | ||
| COLLECTD_TYPE_PLUGIN_INSTANCE, COLLECTD_TYPE_TYPE, COLLECTD_TYPE_TYPE_INSTANCE, | ||
| COLLECTD_TYPE_VALUES, COLLECTD_TYPE_INTERVAL, COLLECTD_TYPE_INTERVAL_HR, | ||
| COLLECTD_TYPE_MESSAGE, COLLECTD_TYPE_SEVERITY, COLLECTD_TYPE_SIGN_SHA256, | ||
| COLELCTD_TYPE_ENCR_AES256 | ||
| }; | ||
| static const size_t collectd_types_length = NDPI_ARRAY_LENGTH(collectd_types); | ||
|
|
||
| static void ndpi_int_collectd_add_connection(struct ndpi_detection_module_struct * const ndpi_struct, | ||
| struct ndpi_flow_struct * const flow) | ||
| { | ||
| NDPI_LOG_INFO(ndpi_struct, "found collectd\n"); | ||
| ndpi_set_detected_protocol(ndpi_struct, flow, | ||
| NDPI_PROTOCOL_COLLECTD, | ||
| NDPI_PROTOCOL_UNKNOWN, | ||
| NDPI_CONFIDENCE_DPI); | ||
| } | ||
|
|
||
| static u_int16_t npdi_int_collectd_block_size(struct ndpi_packet_struct const * const packet, | ||
| u_int16_t const block_offset) | ||
| { | ||
| if (block_offset + 4 > packet->payload_packet_len) | ||
| { | ||
| return 0; | ||
| } | ||
|
|
||
| u_int16_t next_block = ntohs(get_u_int16_t(packet->payload, block_offset + 2)); | ||
| if (block_offset + next_block > packet->payload_packet_len || | ||
| (u_int16_t)(block_offset + next_block) <= block_offset /* possible overflow or next_block is zero */) | ||
| { | ||
| return 0; | ||
| } | ||
|
|
||
| return next_block; | ||
| } | ||
|
|
||
| static int ndpi_int_collectd_check_type(u_int16_t block_type) | ||
| { | ||
| size_t i; | ||
|
|
||
| for (i = 0; i < collectd_types_length; ++i) | ||
| { | ||
| if (block_type == collectd_types[i]) | ||
| { | ||
| return 0; | ||
| } | ||
| } | ||
|
|
||
| return 1; | ||
| } | ||
|
|
||
| static int ndpi_int_collectd_dissect_hostname(struct ndpi_flow_struct * const flow, | ||
| struct ndpi_packet_struct const * const packet, | ||
| u_int16_t block_offset, u_int16_t block_length) | ||
| { | ||
| return (ndpi_hostname_sni_set(flow, &packet->payload[4], block_length) == NULL); | ||
| } | ||
|
|
||
| static int ndpi_int_collectd_dissect_username(struct ndpi_flow_struct * const flow, | ||
| struct ndpi_packet_struct const * const packet, | ||
| u_int16_t block_offset) | ||
| { | ||
| u_int16_t username_length = ntohs(get_u_int16_t(packet->payload, 4)); | ||
|
|
||
| if(username_length > packet->payload_packet_len - | ||
| COLLECTD_ENCR_AES256_MIN_BLOCK_SIZE - | ||
| COLLECTD_ENCR_AES256_IV_SIZE) | ||
| { | ||
| return 1; | ||
| } | ||
|
|
||
| size_t sz_len = ndpi_min(sizeof(flow->protos.collectd.client_username) - 1, username_length); | ||
| memcpy(flow->protos.collectd.client_username, &packet->payload[6], sz_len); | ||
| flow->protos.collectd.client_username[sz_len] = '\0'; | ||
|
|
||
| return 0; | ||
| } | ||
|
|
||
| void ndpi_search_collectd(struct ndpi_detection_module_struct *ndpi_struct, | ||
| struct ndpi_flow_struct *flow) | ||
| { | ||
| struct ndpi_packet_struct const * const packet = &ndpi_struct->packet; | ||
| u_int16_t num_blocks, malformed_blocks = 0; | ||
| u_int16_t block_offset = 0, block_type, block_length; | ||
| u_int16_t hostname_offset, hostname_length = 0; | ||
|
|
||
| NDPI_LOG_DBG(ndpi_struct, "search collectd\n"); | ||
|
|
||
| for (num_blocks = 0; num_blocks < COLLECTD_MAX_BLOCKS_TO_DISSECT; | ||
| ++num_blocks, block_offset += block_length) | ||
| { | ||
| block_length = npdi_int_collectd_block_size(packet, block_offset); | ||
| if (block_length == 0) | ||
| { | ||
| break; | ||
| } | ||
|
|
||
| block_type = ntohs(get_u_int16_t(packet->payload, block_offset)); | ||
| if (ndpi_int_collectd_check_type(block_type) != 0) | ||
| { | ||
| malformed_blocks++; | ||
| } else { | ||
| if (block_type == COLLECTD_TYPE_HOST) | ||
| { | ||
| /* | ||
| * Dissect the hostname later, when we are sure that it is | ||
| * the collectd protocol. | ||
| */ | ||
| hostname_offset = block_offset; | ||
| hostname_length = block_length; | ||
| } else if (block_type == COLELCTD_TYPE_ENCR_AES256) { | ||
| /* | ||
| * The encrypted data block is a special case. | ||
| * It is the only dissectable block as everything else in it | ||
| * is encrypted. | ||
| */ | ||
| if (block_length != packet->payload_packet_len || | ||
| block_length < COLLECTD_ENCR_AES256_MIN_BLOCK_SIZE || | ||
| ndpi_int_collectd_dissect_username(flow, packet, block_offset) != 0) | ||
| { | ||
| NDPI_EXCLUDE_PROTO(ndpi_struct, flow); | ||
| } else { | ||
| ndpi_int_collectd_add_connection(ndpi_struct, flow); | ||
| } | ||
| return; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| if (num_blocks < COLLECTD_MIN_BLOCKS_REQUIRED) | ||
| { | ||
| NDPI_EXCLUDE_PROTO(ndpi_struct, flow); | ||
| return; | ||
| } | ||
|
|
||
| if ((hostname_length > 0 && | ||
| ndpi_int_collectd_dissect_hostname(flow, packet, hostname_offset, | ||
| hostname_length) != 0) || | ||
| malformed_blocks > 0) | ||
| { | ||
| ndpi_set_risk(ndpi_struct, flow, NDPI_MALFORMED_PACKET, "Invalid collectd Header"); | ||
| } | ||
|
|
||
| ndpi_int_collectd_add_connection(ndpi_struct, flow); | ||
| } | ||
|
|
||
| void init_collectd_dissector(struct ndpi_detection_module_struct *ndpi_struct, | ||
| u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask) | ||
| { | ||
| ndpi_set_bitmask_protocol_detection("collectd", ndpi_struct, detection_bitmask, *id, | ||
| NDPI_PROTOCOL_COLLECTD, | ||
| ndpi_search_collectd, | ||
| NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD, | ||
| SAVE_DETECTION_BITMASK_AS_UNKNOWN, | ||
| ADD_TO_DETECTION_BITMASK | ||
| ); | ||
|
|
||
| *id += 1; | ||
| } |
Binary file not shown.
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| Guessed flow protos: 3 | ||
|
|
||
| DPI Packets (UDP): 13 (1.62 pkts/flow) | ||
| Confidence Match by port : 3 (flows) | ||
| Confidence DPI : 5 (flows) | ||
|
|
||
| collectd 81 109386 8 | ||
|
|
||
| 1 UDP 127.0.0.1:35988 -> 127.0.0.1:25826 [proto: 298/collectd][ClearText][Confidence: DPI][cat: System/18][49 pkts/66012 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][406.49 sec][Hostname/SNI: devlap.fritz.box][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 8783/0 10000/0 3188/0][Pkt Len c2s/s2c min/avg/max/stddev: 193/0 1347/0 1388/0 167/0][PLAIN TEXT (devlap.fritz.box)][Plen Bins: 0,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,4,83,10,0,0,0,0,0] | ||
| 2 UDP 127.0.0.1:36832 -> 127.0.0.1:25826 [proto: 298/collectd][ClearText][Confidence: DPI][cat: System/18][17 pkts/22755 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][134.67 sec][Hostname/SNI: devlap.fritz.box][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 0/0 8311/0 10000/0 3518/0][Pkt Len c2s/s2c min/avg/max/stddev: 924/0 1339/0 1384/0 104/0][PLAIN TEXT (devlap.fritz.box)][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,0,5,89,0,0,0,0,0,0] | ||
| 3 UDP 192.168.178.35:39576 -> 239.192.74.66:25826 [proto: 298/collectd][ClearText][Confidence: Match by port][cat: System/18][6 pkts/8363 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][708570048.00 sec][bytes ratio: 1.000 (Upload)][IAT c2s/s2c min/avg/max/stddev: 907/0 839078848/0 4195363456/0 1678142336/0][Pkt Len c2s/s2c min/avg/max/stddev: 1274/0 1394/0 1434/0 54/0][PLAIN TEXT (RmBJSP)][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,16,0,0,0,33,50,0,0,0,0] | ||
| 4 UDP 127.0.0.1:54138 -> 127.0.0.1:25826 [proto: 298/collectd][ClearText][Confidence: DPI][cat: System/18][5 pkts/6744 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][33.27 sec][Hostname/SNI: devlap.fritz.box][PLAIN TEXT (devlap.fritz.box)][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,20,0,20,40,20,0,0,0,0,0] | ||
| 5 UDP 192.168.178.35:39577 -> 239.192.74.66:25826 [proto: 298/collectd][ClearText][Confidence: Match by port][cat: System/18][1 pkts/1408 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][< 1 sec][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,100,0,0,0,0,0] | ||
| 6 UDP 127.0.0.1:36064 -> 127.0.0.1:25826 [proto: 298/collectd][ClearText][Confidence: DPI][cat: System/18][1 pkts/1368 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][< 1 sec][Hostname/SNI: devlap.fritz.box][Risk: ** Malformed Packet **][Risk Score: 10][Risk Info: Invalid collectd Header][PLAIN TEXT (devlap.fritz.box)][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,100,0,0,0,0,0,0] | ||
| 7 UDP 127.0.0.1:36320 -> 127.0.0.1:25826 [proto: 298/collectd][ClearText][Confidence: Match by port][cat: System/18][1 pkts/1368 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][< 1 sec][PLAIN TEXT (devlap.fritz.box)][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,100,0,0,0,0,0,0] | ||
| 8 UDP 127.0.0.1:36576 -> 127.0.0.1:25826 [proto: 298/collectd][ClearText][Confidence: DPI][cat: System/18][1 pkts/1368 bytes -> 0 pkts/0 bytes][Goodput ratio: 97/0][< 1 sec][Hostname/SNI: devlap.fritz.box][PLAIN TEXT (devlap.fritz.box)][Plen Bins: 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,100,0,0,0,0,0,0] |
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters