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feat(application): implement DTLS 1.3 unified-header records (#2467) - #2494

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feat/2467-dtls13-unified-header
Oct 31, 2026
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feat(application): implement DTLS 1.3 unified-header records (#2467)#2494
JarryShaw merged 3 commits into
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feat/2467-dtls13-unified-header

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@JarryShaw JarryShaw commented Oct 31, 2026

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Closes #2467. Parses and builds RFC 9147 unified-header records. Refuses connection-ID records. Enforces the 16-octet minimum ciphertext from RFC 9147 section 4.2.3. Narrow: unified-header file 15 passed, 13 subtests; DTLS-referencing files 223 passed.

@JarryShaw
feat(application): implement DTLS 1.3 unified-header records (#2467)
2f83321 
- Parse and make the unified-header ciphertext record (RFC 9147 4.1) in DTLS:
  first octet 001CSLEE, 8- or 16-bit sequence number, optional length.
- Dispatch on the first octet's 001 prefix ahead of legacy content types.
- A record with a connection ID, or a length past the buffer, degrades to Raw.
- Add DTLSCiphertext header schema and data model.
- Update the DTLS docs and the constant-home allowlist for the EE bit offset.

Tests: 11 new unit tests, all passing; DTLS modules at 100% coverage.
@JarryShaw
fix(application): refuse DTLS 1.3 unified-header records under the sa…
e8011a8 
…mple length (#2467)

- Refuse a unified-header ciphertext shorter than 16 octets, the record-number
  sample (RFC 9147 4.2.3), so the datagram degrades to Raw on UDP 5684.
- Raise the test fixture to 16 octets; the old 12-octet stand-in was not a
  record the RFC allows.
- Allowlist the new constant in the one-home test: it is not a pcap header.

Tests: new short-ciphertext cases fail without the check and pass with it.
@JarryShaw JarryShaw added the review: pending No verdict for the current head - never reviewed, or the head moved since the last one label Oct 31, 2026
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JarryShaw commented Oct 31, 2026

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GOOD TO GO (Sonnet, e8011a8b9). The unified header matches RFC 9147 section 4, with 001 prefix and the C, S, L and EE fields. Connection-ID records are refused. The 16-octet floor from section 4.2.3 applies to the AES and ChaCha20 procedure, which is all DTLS 1.3 defines today. DTLSCiphertext is its own model. Narrow tests: 15 passed, 13 subtests. Minor, not blocking: the new test at line 114 triggers a SchemaWarning for a -16 length. Merge is yours.

@JarryShaw JarryShaw added review: good-to-go Cross-review at the current head says ready; CI state is separate and removed review: pending No verdict for the current head - never reviewed, or the head moved since the last one labels Oct 31, 2026
@JarryShaw JarryShaw moved this to In review in PyPCAPKit Oct 31, 2026
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JarryShaw commented Oct 31, 2026

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Red required check on e8011a8b9, fix in progress. Python 3.15 fails on tests/protocols/test_package_reexports_1807_unit.py:129: a child export, most likely the new DTLSCiphertext, is not re-exported by its package. The fix is a worker commit on top of this head, a fast-forward, which I will push once the Actions queue is below 20 (it is 9 now). The review: good-to-go label stays until the new head is reviewed.

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github-actions Bot commented Oct 31, 2026 •
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Coverage: 94.51% (unit tier, Python 3.15, 27e5bcfe5, Unit Tests run success)

Package Statements Missed Branches Partial Cover
pcapkit (top level) 104 4 20 2 95.16%
pcapkit/const 19677 133 2628 120 98.85%
pcapkit/corekit 2605 74 818 37 96.52%
pcapkit/dumpkit 281 3 100 3 98.43%
pcapkit/foundation 3070 24 1072 26 98.79%
pcapkit/interface 138 4 52 3 96.32%
pcapkit/protocols 18117 194 4802 180 98.36%
pcapkit/toolkit 924 36 334 10 95.55%
pcapkit/utilities 502 7 144 5 98.14%
pcapkit/vendor 4449 1854 1020 167 55.11%

Per-file detail: the coverage-html artifact of this run.

@JarryShaw
fix(protocols): re-export DTLSCiphertext from the data and schema pac…
27e5bcf 
…kages (#2467)

- pcapkit/protocols/data/application/__init__.py and
  pcapkit/protocols/schema/application/__init__.py do not import
  DTLSCiphertext, which their dtls __all__ lists.
- Re-export it as DTLS_Ciphertext, matching DTLS_Handshake.
- Add the alias to the data and schema aggregator __all__ lists.

Fixes test_package_reexports_1807_unit (test_every_package_reexports_every_child_export).
@JarryShaw JarryShaw added review: pending No verdict for the current head - never reviewed, or the head moved since the last one and removed review: good-to-go Cross-review at the current head says ready; CI state is separate labels Oct 31, 2026
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JarryShaw commented Oct 31, 2026

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GOOD TO GO (Sonnet, 27e5bcfe5). The fix only adds DTLS_Ciphertext to the re-export lists in four __init__.py files, following the DTLS_Handshake convention. Re-export test: 6 passed. Wider run: 85 passed, 366 subtests. Not verified: Python 3.15 itself, so the red check clearing is inferred from the passing test, not observed. Watch the 3.15 leg on the new head. Merge is yours.

@JarryShaw JarryShaw added review: good-to-go Cross-review at the current head says ready; CI state is separate and removed review: pending No verdict for the current head - never reviewed, or the head moved since the last one labels Oct 31, 2026
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JarryShaw merged commit b915586 into main Oct 31, 2026
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JarryShaw deleted the feat/2467-dtls13-unified-header branch October 31, 2026 15:19
@github-project-automation github-project-automation Bot moved this from In review to Done in PyPCAPKit Oct 31, 2026
@JarryShaw JarryShaw added feat Pull requests that add a new capability (feat: subject prefix) and removed review: good-to-go Cross-review at the current head says ready; CI state is separate labels Oct 31, 2026
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DTLS 1.3's unified-header (RFC 9147) encrypted-record format is unimplemented

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