mirror of
https://github.com/vel21ripn/nDPI.git
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5f312c0cd6
* Fix JA4 ALPN fingerprint to use first and last characters According to the JA4 specification (line 2139), the ALPN field should contain the first and last characters of the first ALPN extension value. Currently, nDPI uses the first and second characters (alpn[0] and alpn[1]), which produces incorrect fingerprints that don't match other JA4 implementations like Wireshark. For example, with ALPN 'http/1.1': - Current (incorrect): 'ht' (first + second char) - Fixed (correct): 'h1' (first + last char) This change ensures nDPI's JA4 implementation conforms to the official specification and maintains interoperability with other JA4 tools. Fixes: Incorrect JA4 ALPN fingerprint generation * Fix JA4 ALPN implementation to correctly parse first ALPN protocol The previous fix attempted to use strlen(ja->client.alpn)-1 but this was insufficient because nDPI modifies the ALPN string by: 1. Adding null terminators that truncate the last character 2. Converting semicolons to dashes, affecting multi-protocol ALPNs This complete fix: - Adds alpn_original_last field to store the true last character - Captures the last character of the FIRST ALPN protocol only (before ;/,) - Preserves the original character before nDPI's string modifications Now correctly implements JA4 spec: first + last characters of first ALPN protocol Examples: - ALPN 'h2;http/1.1' -> 'h2' (not 'h.' or 'h1') - ALPN 'http/1.1' -> 'h1' (not 'ht' or 'h.') Fixes: #2914 * Fix JA4 SNI detection to properly handle missing SNI extensions Previously, nDPI incorrectly set JA4 SNI flag to 'd' (domain present) for flows without any SNI extension. This was because the logic only checked for NDPI_NUMERIC_IP_HOST risk (set when SNI contains IP) but didn't distinguish between missing SNI and domain SNI. Now properly detects: - No SNI extension → 'i' flag - SNI with IP address → 'i' flag - SNI with domain → 'd' flag This matches the JA4 specification.
36 lines
3.5 KiB
Text
36 lines
3.5 KiB
Text
DPI Packets (TCP): 7 (7.00 pkts/flow)
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DPI Packets (UDP): 17 (17.00 pkts/flow)
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Confidence DPI : 2 (flows)
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Num dissector calls: 9 (4.50 diss/flow)
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LRU cache ookla: 0/0/0 (insert/search/found)
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LRU cache bittorrent: 0/0/0 (insert/search/found)
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LRU cache stun: 0/8/0 (insert/search/found)
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LRU cache tls_cert: 1/5/0 (insert/search/found)
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LRU cache mining: 0/0/0 (insert/search/found)
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LRU cache msteams: 0/0/0 (insert/search/found)
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LRU cache fpc_dns: 0/1/0 (insert/search/found)
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Automa host: 1/1 (search/found)
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Automa domain: 1/0 (search/found)
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Automa tls cert: 1/1 (search/found)
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Automa risk mask: 0/0 (search/found)
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Automa common alpns: 1/1 (search/found)
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Patricia risk mask: 2/0 (search/found)
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Patricia risk mask IPv6: 0/0 (search/found)
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Patricia risk: 0/0 (search/found)
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Patricia risk IPv6: 0/0 (search/found)
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Patricia protocols: 2/2 (search/found)
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Patricia protocols IPv6: 0/0 (search/found)
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GeForceNow 108 69000 2
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Fun 108 69000 2
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Game 108 69000 2
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JA Host Stats:
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IP Address # JA4C
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1 192.168.1.245 2
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1 TCP 192.168.1.245:57490 <-> 80.84.167.206:49100 [proto: 91.341/TLS.GeForceNow][IP: 342/Nvidia][Encrypted][Confidence: DPI][FPC: 342/Nvidia, Confidence: IP address][DPI packets: 7][cat: Game/8][27 pkts/8759 bytes <-> 27 pkts/39892 bytes][Goodput ratio: 80/96][1.34 sec][Hostname/SNI: 80-84-167-206.cloudmatchbeta.nvidiagrid.net][(Advertised) ALPNs: http/1.1][TLS Supported Versions: GREASE;TLSv1.3;TLSv1.2][bytes ratio: -0.640 (Download)][IAT c2s/s2c min/avg/max/stddev: 0/0 56/12 946/84 200/21][Pkt Len c2s/s2c min/avg/max/stddev: 66/66 324/1477 2962/2962 631/1355][Risk: ** Known Proto on Non Std Port **][Risk Score: 50][Risk Info: Expected on port 443][TCP Fingerprint: 2_64_64240_2e3cee914fc1/Linux][TLSv1.2][JA4: t13d1516h1_8daaf6152771_e5627efa2ab1][ServerNames: prod.cloudmatchbeta.nvidiagrid.net,*.cloudmatchbeta.nvidiagrid.net][JA3S: 098e26e2609212ac1bfac552fbe04127][Issuer: C=US, O=DigiCert Inc, CN=DigiCert TLS RSA SHA256 2020 CA1][Subject: C=US, ST=California, L=Santa Clara, O=NVIDIA Corporation, CN=prod.cloudmatchbeta.nvidiagrid.net][Certificate SHA-1: 8C:24:BC:2B:01:63:B9:AC:83:90:F3:A9:F9:EA:72:5E:F4:47:A2:77][Chrome][Validity: 2022-08-09 00:00:00 - 2023-08-09 23:59:59][Cipher: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256][Plen Bins: 0,23,2,0,0,5,0,0,14,0,2,0,0,0,0,0,5,0,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,0,42]
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2 UDP 192.168.1.245:52441 <-> 80.84.167.206:18452 [proto: 30.341/DTLS.GeForceNow][IP: 342/Nvidia][Encrypted][Confidence: DPI][FPC: 78/STUN, Confidence: DPI][DPI packets: 17][cat: Game/8][21 pkts/3455 bytes <-> 33 pkts/16894 bytes][Goodput ratio: 74/92][1.03 sec][bytes ratio: -0.660 (Download)][IAT c2s/s2c min/avg/max/stddev: 0/0 51/30 360/689 91/130][Pkt Len c2s/s2c min/avg/max/stddev: 87/67 165/512 582/1222 101/514][Mapped IP/Port: 10.0.20.8:51651][Risk: ** TLS Cert Validity Too Long **][Risk Score: 50][Risk Info: TLS Cert lasts 730 days][DTLSv1.2][JA4: dd2i110700_c45550529adf_d9dd6182da81][JA3S: a9e0318114bb46bdbeef6d54e42c915f][Issuer: CN=NVIDIA GameStream][Subject: CN=NVIDIA GameStream][Certificate SHA-1: D1:FC:74:AD:A0:6F:11:C1:F4:4D:F9:4C:2B:25:88:A6:2B:6E:65:1E][Validity: 2022-05-21 12:24:31 - 2024-05-20 12:24:31][Cipher: TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256][PLAIN TEXT (BffATDg/Gz0)][Plen Bins: 1,17,33,9,12,1,0,0,0,0,1,0,0,0,0,0,1,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,21,0,0,0,0,0,0,0,0,0,0,0]
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