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DTLS: add support for Alert message type (similar to TLS) #2406

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Apr 25, 2024
Merged

DTLS: add support for Alert message type (similar to TLS) #2406

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13 changes: 12 additions & 1 deletion src/lib/protocols/tls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1194,7 +1194,7 @@ int is_dtls(const u_int8_t *buf, u_int32_t buf_len, u_int32_t *block_len) {
if(buf_len <= 13)
return 0;

if((buf[0] != 0x16 && buf[0] != 0x14 && buf[0] != 0x17) || /* Handshake, change-cipher-spec, Application-Data */
if((buf[0] != 0x16 && buf[0] != 0x14 && buf[0] != 0x17 && buf[0] != 0x15) || /* Handshake, change-cipher-spec, Application-Data, Alert */
!((buf[1] == 0xfe && buf[2] == 0xff) || /* Versions */
(buf[1] == 0xfe && buf[2] == 0xfd) ||
(buf[1] == 0x01 && buf[2] == 0x00))) {
Expand Down Expand Up @@ -1334,6 +1334,17 @@ static int ndpi_search_tls_udp(struct ndpi_detection_module_struct *ndpi_struct,
processed += block_len + 13;
flow->tls_quic.certificate_processed = 1; /* Fake, to avoid extra dissection */
break;
} else if(block[0] == 0x15 /* Alert */) {
#ifdef DEBUG_TLS
printf("[TLS] TLS Alert\n");
#endif

if(block_len == 2) {
u_int8_t alert_level = block[13];

if(alert_level == 2 /* Warning (1), Fatal (2) */)
ndpi_set_risk(flow, NDPI_TLS_FATAL_ALERT, "Found fatal TLS alert");
}
} else {
#ifdef DEBUG_TLS
printf("[TLS] Appllication Data\n");
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Binary file modified tests/cfgs/default/pcap/dtls.pcap
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22 changes: 12 additions & 10 deletions tests/cfgs/default/result/dtls.pcap.out
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Original file line number Diff line number Diff line change
@@ -1,11 +1,11 @@
DPI Packets (UDP): 2 (2.00 pkts/flow)
Confidence DPI : 1 (flows)
Num dissector calls: 2 (2.00 diss/flow)
DPI Packets (UDP): 6 (3.00 pkts/flow)
Confidence DPI : 2 (flows)
Num dissector calls: 5 (2.50 diss/flow)
LRU cache ookla: 0/0/0 (insert/search/found)
LRU cache bittorrent: 0/0/0 (insert/search/found)
LRU cache zoom: 0/0/0 (insert/search/found)
LRU cache stun: 0/0/0 (insert/search/found)
LRU cache tls_cert: 0/2/0 (insert/search/found)
LRU cache tls_cert: 0/5/0 (insert/search/found)
LRU cache mining: 0/0/0 (insert/search/found)
LRU cache msteams: 0/0/0 (insert/search/found)
LRU cache stun_zoom: 0/0/0 (insert/search/found)
Expand All @@ -14,20 +14,22 @@ Automa domain: 0/0 (search/found)
Automa tls cert: 0/0 (search/found)
Automa risk mask: 0/0 (search/found)
Automa common alpns: 0/0 (search/found)
Patricia risk mask: 2/0 (search/found)
Patricia risk mask: 4/0 (search/found)
Patricia risk mask IPv6: 0/0 (search/found)
Patricia risk: 0/0 (search/found)
Patricia risk IPv6: 0/0 (search/found)
Patricia protocols: 2/0 (search/found)
Patricia protocols: 3/1 (search/found)
Patricia protocols IPv6: 0/0 (search/found)

DTLS 2 394 1
DTLS 6 1341 2

Safe 2 394 1
Safe 6 1341 2

JA3 Host Stats:
IP Address # JA3C
1 192.168.13.203 1
1 10.191.227.13 1
2 192.168.13.203 1


1 UDP 192.168.13.203:40739 -> 192.168.13.57:56515 [proto: 30/DTLS][IP: 0/Unknown][Encrypted][Confidence: DPI][DPI packets: 2][cat: Web/5][2 pkts/394 bytes -> 0 pkts/0 bytes][Goodput ratio: 78/0][< 1 sec][Risk: ** TLS (probably) Not Carrying HTTPS **** Missing SNI TLS Extn **** Unidirectional Traffic **][Risk Score: 70][Risk Info: No server to client traffic / No ALPN / SNI should always be present][DTLSv1.2][JA3C: bd743610892cec1efed851b2b5efd4f5][JA4: t00d120700_7c0e62f61317_d9dd6182da81][Plen Bins: 0,0,0,0,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
1 UDP 10.191.227.13:54162 <-> 157.240.16.128:3478 [VLAN: 10][proto: GTP:30/DTLS][IP: 119/Facebook][Encrypted][Confidence: DPI][DPI packets: 4][cat: Web/5][3 pkts/665 bytes <-> 1 pkts/282 bytes][Goodput ratio: 61/69][0.20 sec][Risk: ** TLS (probably) Not Carrying HTTPS **** Missing SNI TLS Extn **** TLS Fatal Alert **][Risk Score: 70][Risk Info: No ALPN / SNI should always be present / Found fatal TLS alert][DTLSv1.2][JA3C: b2a6643b6798940d25020cb4abe9e2aa][JA4: t00d160700_7c8d7d5e37b2_c38571a0f2a5][Firefox][Plen Bins: 25,0,0,0,0,0,75,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
2 UDP 192.168.13.203:40739 -> 192.168.13.57:56515 [proto: 30/DTLS][IP: 0/Unknown][Encrypted][Confidence: DPI][DPI packets: 2][cat: Web/5][2 pkts/394 bytes -> 0 pkts/0 bytes][Goodput ratio: 78/0][< 1 sec][Risk: ** TLS (probably) Not Carrying HTTPS **** Missing SNI TLS Extn **** Unidirectional Traffic **][Risk Score: 70][Risk Info: No server to client traffic / No ALPN / SNI should always be present][DTLSv1.2][JA3C: bd743610892cec1efed851b2b5efd4f5][JA4: t00d120700_7c0e62f61317_d9dd6182da81][Plen Bins: 0,0,0,0,100,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
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