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Merged
IvanNardi merged 1 commit into from
Mar 27, 2026
+18 −5
Merged

Add configuration for the new nDPI server fingerprint #3147

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8 changes: 8 additions & 0 deletions doc/configuration_parameters.rst
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Expand Up @@ -32,6 +32,14 @@ List of the supported configuration options:
+--------------+---------------------------------------------------------------+-----------------+------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL | "metadata.tcp_fingerprint_format" | 0 | 0 | 1 | Format of the TCP fingerprint. 0 = native nDPI format, 1 = MuonOF (see: https://github.com/sundruid/muonfp). |
+--------------+---------------------------------------------------------------+-----------------+------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL | "metadata.ndpi_server_fingerprint" | enable | NULL | NULL | Enable/disable computation and export of nDPI server fingerprint. |
+--------------+---------------------------------------------------------------+-----------------+------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL | "metadata.ndpi_fingerprint" | enable | NULL | NULL | Enable/disable computation and export of nDPI fingerprint. See https://www.ntop.org/beyond-ja3-ja4-introducing-ndpi-traffic-fingerprint |
+--------------+---------------------------------------------------------------+-----------------+------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL | "metadata.ndpi_fingerprint_format" | 0 | 0 | 1 | Format of the nDPI fingerprint ((i.e. metadata.ndpi_fingerprint)). 0 = client only, 1 = client and server. |
+--------------+---------------------------------------------------------------+-----------------+------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL | "metadata.ndpi_fingerprint_ignore_tcp_fp" | disable | NULL | NULL | Configure if TCP fingerprint is used or not for nDPI fingerprint (i.e. for metadata.ndpi_fingerprint) calculation. |
+--------------+---------------------------------------------------------------+-----------------+------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL | "dpi.guess_on_giveup" | 0x03 | 0x00 | 0x03 | Guess flow classification if DPI fails. Bitmask: 0x0 = disabled; 0x01 = port; 0x02 = IP. |
+--------------+---------------------------------------------------------------+-----------------+------------+------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| NULL | "dpi.guess_ip_before_port" | disable | NULL | NULL | Enable/disable guessing by IP first when guessing flow classifcation. Disabled = guess by port first. |
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1 change: 1 addition & 0 deletions example/config_only_classification.txt
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Expand Up @@ -7,6 +7,7 @@ flow_risk.all,0
#General metadata
metadata.tcp_fingerprint,0
metadata.ndpi_fingerprint,0
metadata.ndpi_server_fingerprint,0
dpi.compute_entropy,0
#BITTORRENT
bittorrent,metadata.hash,0
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1 change: 1 addition & 0 deletions example/only_classification.conf
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Expand Up @@ -7,6 +7,7 @@
#General metadata
--cfg=metadata.tcp_fingerprint,0
--cfg=metadata.ndpi_fingerprint,0 #Note that you can't use custom rules based on fingerprints!
--cfg=metadata.ndpi_server_fingerprint,0
--cfg=dpi.compute_entropy,0
#BITTORRENT
--cfg=bittorrent,metadata.hash,0
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1 change: 1 addition & 0 deletions example/perf.conf
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Expand Up @@ -9,3 +9,4 @@
--cfg=openvpn,dpi.heuristics,0x01
--cfg=stun,max_packets_extra_dissection,4
--cfg=tcp_ack_payload_heuristic,0
--cfg=metadata.ndpi_server_fingerprint,0
1 change: 1 addition & 0 deletions src/include/ndpi_private.h
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Expand Up @@ -234,6 +234,7 @@ struct ndpi_detection_module_config_struct {
int tcp_fingerprint_enabled;
int tcp_fingerprint_raw_enabled;
int ndpi_fingerprint_enabled;
int ndpi_server_fingerprint_enabled;
ndpi_fingerprint_format ndpi_fingerprint_format;

char filename_config[CFG_MAX_LEN];
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1 change: 1 addition & 0 deletions src/lib/ndpi_config.c
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Expand Up @@ -218,6 +218,7 @@ const struct cfg_param cfg_params[] = {
{ NULL, "metadata.tcp_fingerprint_raw", "disable", NULL, NULL, CFG_PARAM_ENABLE_DISABLE, __OFF(tcp_fingerprint_raw_enabled), NULL },
{ NULL, "metadata.tcp_fingerprint_format", "0", "0" /* min */, "1" /* max */, CFG_PARAM_INT, __OFF(tcp_fingerprint_format), NULL },

{ NULL, "metadata.ndpi_server_fingerprint", "enable", NULL, NULL, CFG_PARAM_ENABLE_DISABLE, __OFF(ndpi_server_fingerprint_enabled), NULL },
{ NULL, "metadata.ndpi_fingerprint", "enable", NULL, NULL, CFG_PARAM_ENABLE_DISABLE, __OFF(ndpi_fingerprint_enabled), NULL },
{ NULL, "metadata.ndpi_fingerprint_format", "0", "0" /* client-only */, "1" /* client+server only */, CFG_PARAM_INT, __OFF(ndpi_fingerprint_format), NULL },
{ NULL, "metadata.ndpi_fingerprint_ignore_tcp_fp", "disable", NULL, NULL, CFG_PARAM_ENABLE_DISABLE, __OFF(tls_ndpifp_ignore_tcp_fingerprint), NULL },
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10 changes: 5 additions & 5 deletions src/lib/protocols/tls.c
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Expand Up @@ -2457,10 +2457,10 @@ static void ndpi_compute_ja4(struct ndpi_detection_module_struct *ndpi_struct,

/* **************************************** */

void ndpi_compute_tls_server_fingerprint(struct ndpi_flow_struct *flow,
bool is_dtls,
u_int32_t quic_version,
ndpi_tls_server_info *s) {
static void ndpi_compute_tls_server_fingerprint(struct ndpi_flow_struct *flow,
bool is_dtls,
u_int32_t quic_version,
ndpi_tls_server_info *s) {
char tls_s[128], fp_buf[13];
u_int tls_s_len, i;
u_int8_t sha_hash[NDPI_SHA256_BLOCK_SIZE];
Expand Down Expand Up @@ -2788,7 +2788,7 @@ int processClientServerHello(struct ndpi_detection_module_struct *ndpi_struct,
if(flow->protos.tls_quic.ssl_version == 0)
flow->protos.tls_quic.ssl_version = tls_version;

if(ndpi_struct->cfg.ndpi_fingerprint_enabled
if(ndpi_struct->cfg.ndpi_server_fingerprint_enabled
&& (flow->ndpi.server_fingerprint == NULL))
ndpi_compute_tls_server_fingerprint(flow, is_dtls, quic_version, s);

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