fix(cli): stream decrypt and inspect instead of buffering - #3939
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📝 WalkthroughWalkthroughTDF decryption now reads seekable input and streams plaintext to stdout or managed output files. Handler APIs, direct-destination handling, cleanup behavior, and validation coverage were updated. ChangesStreaming decryption
Priority: ⬇️ Low Estimated code review effort: 4 (Complex) | ~45 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant User
participant DecryptCommand
participant StreamIO
participant Handler
User->>DecryptCommand: Provide file or stdin input
DecryptCommand->>StreamIO: OpenSeekable input
DecryptCommand->>Handler: Decrypt with seekable input and options
Handler->>StreamIO: Write plaintext to stdout or OutputFile
DecryptCommand->>StreamIO: Commit or clean up output
Suggested reviewers: Merge Risk: 🟡 Moderate · up to Decrypting to a symlink that targets the input can destroy the source file and fail the operation. Reject aliased input/output paths before creating the output destination. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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`otdfctl decrypt` read the whole TDF into memory, handed the slice to DecryptBytes, which accumulated the whole plaintext in a bytes.Buffer, and then -- for stdout -- called Buffer.String(), allocating a third full copy. Peak RSS was roughly 3.6x the payload; a 1 GiB file cost ~3.7 GiB of RAM and a large enough file simply OOMed on a machine with plenty of disk for it. The plaintext now streams from the SDK reader to the destination. Handler.Decrypt takes an io.ReadSeeker and an io.Writer, with DecryptOptions replacing the positional parameter list, and inspect reaches the manifest through the same seekable reader rather than buffering the archive to get at its tail. Measured on a 1 GiB round-trip: encrypt peaks at 74 MiB and decrypt at 67 MiB, against ~3754 MiB and ~3808 MiB before. The round-trip is byte-identical. io.Copy is what does the streaming, and it does so only because sdk.Reader implements WriteTo, which decrypts one segment at a time. Its Read delegates to ReadAt, which grows an internal bytes.Buffer holding every segment decrypted so far -- so dropping WriteTo would silently restore the old memory profile with no test failure to show for it. A compile-time assertion pins the interface. Removes MaxFileSize. The 10 GB cap existed to bound RAM; the real limit is the SDK maxFileSizeSupported at 64 GiB, which enforces itself. Output to a file is atomic, as on the encrypt side: the plaintext goes to a temporary sibling and is renamed into place only on success. Since cli.ExitWithError calls os.Exit and skips deferred functions, the spooled input and the partial output are discarded explicitly on every exit path -- including inspect's success path, which exits through ExitWithJSON. A destination a rename cannot stand in for -- /dev/null, a fifo, a symlink the caller means to write through -- is opened and written directly instead. decrypt's -o was a plain os.Create before this change, and `-o /dev/null` is a routine way to time a decrypt or check one succeeds without keeping the plaintext; the atomic path alone would have regressed both. The output file mode is deliberately left as it is. #4037 turns it into a per-caller parameter and #4046 applies it through the umask, which is a better answer for the hardcoded 0644 inherited here than anything this PR could do in passing. e2e coverage lands in a new otdfctl/e2e/streaming.bats rather than in encrypt-decrypt.bats, keeping the streaming concerns -- spooling, temp output, peak memory -- apart from that file's entitlement fixtures. Nothing in the new file needs an entitlement, so it needs no policy fixtures: the round-trips use no attributes, and the failure cases are forced with an unresolvable attribute FQN and a KAS allowlist that excludes the platform. Both that file and encrypt-decrypt.bats are tagged unattributed_encrypt, and action.yaml gives the tag its own pass ahead of the parallel batch. That ordering is load-bearing, not tidiness. An encrypt with no attributes falls back to the platform base key, and key-base.bats sets one pointing at https://test-kas-for-base-keys.com, which does not resolve. It cannot put things back afterwards: a base key can be replaced but never cleared, so every unattributed encrypt scheduled after that file yields a TDF nothing can decrypt. Under --jobs 4 the file order is nondeterministic, so overlapping the two made this suite flaky rather than merely broken -- which is how it presented, a different subset of round-trips failing per run. Running alone also keeps the 1 GiB peak-RSS case from measuring itself against three neighbours competing for the same memory. encrypt-decrypt.bats is tagged for the same reason. #4042 lifted its file-level skip, and its very first case is an unattributed round-trip, so it now races key-base.bats for a slot in the parallel batch and fails whenever it loses. That it passes today is an accident of bats scheduling files alphabetically. The underlying leak is still worth closing in key-base.bats. action.yaml also installs the 'time' package, and the peak-RSS case now fails rather than skips when CI lacks GNU time. It is the only test that demonstrates the fix, so a silent skip would let a return to whole-payload buffering through. Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
DecryptOptions replaced Decrypt's positional parameter list, which made the
zero value reachable for the first time: every caller of DecryptBytes had been
forced to pass a session key algorithm, but a struct literal can now omit one.
Decrypt forwarded the field unconditionally, so an omitted algorithm reached
sdk.WithSessionKeyType as the empty string, and ocrypto.NewKeyPair rejects it --
"newTDFReaderConfig failed: failed to create RSA key pair: unsupported key
type:", raised while building the config, before the TDF is read at all.
The option is now only appended when the field is set. The SDK already defaults
kasSessionKey to RSA-2048 when the option is absent, which is the algorithm
decryptRun asks for anyway, so the CLI path is unchanged; what changes is that
DecryptOptions{} means "SDK default" rather than "empty algorithm", matching the
KASAllowList field beside it.
The CLI fills the field in on every path, so this is latent today -- it is the
cost of the struct: a zero value that no positional signature could express is
now constructible, and each field has to say what its zero value means. The
same trap exists on the encrypt side, where an unset WrappingKeyAlgorithm fails
with "key type missing"; that field predates this PR and is left alone here.
Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
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Inline comments:
In `@otdfctl/pkg/streamio/output.go`:
- Line 66: Update the temporary-file creation in NewOutputFile to use a fixed
opaque prefix such as ".otdfctl.tmp-" instead of incorporating
filepath.Base(path), while retaining the random suffix generated by createTemp
and existing directory and mode arguments.
- Around line 24-65: Update decryptRun to detect when the requested output path
aliases the already-open decrypt input before calling NewOutputFile, including
symlink-based aliases, and reject the operation without truncating either file.
Keep the generic symlink write-through behavior in streamio.OutputFile
unchanged; anchor the change in decryptRun and its existing OpenSeekable input
handling.
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otdfctl/cmd/tdf/decrypt.gootdfctl/pkg/handlers/tdf.gootdfctl/pkg/handlers/tdf_test.gootdfctl/pkg/streamio/output.gootdfctl/pkg/streamio/output_unix_test.go
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> **Part 14 of 20** in the DSPX-2604 re-cut. Base branch: `dspx-2604-13-unresolved-kas`. > > This stack replaces #3782 / #3865 / #3921, which stay open and untouched > until it lands. Nothing here is a rebase of those branches — the work was > re-cut from the ticket so each PR stands on its own. ### Proposed Changes `sdk/experimental/tdf` carried its own copies of the manifest and assertion types -- `Manifest`, `Segment`, `KeyAccess`, `Assertion`, `Statement`, `AssertionKey` and the rest -- structurally identical to the ones in `sdk` but distinct to the type system, so anything crossing the boundary needed conversion. Two copies of the JWT signing and verification logic also had to be kept in step by hand. Replaces both files' definitions with type aliases. `sdk` owns the definitions; this package re-exports them. Every exported name and every method survives: `Assertion.Sign` / `Verify` / `GetHash`, `Statement.UnmarshalJSON`, `AssertionKey.IsEmpty` / `Algorithm`, `AssertionVerificationKeys.Get` / `IsEmpty` and the five `String()` methods all come along with the aliased types, so importers compile unchanged. A manifest produced here can now be handed to the stable SDK without conversion, which is what the follow-up delegation needs. Two deliberate non-aliases: `Policy`, `PolicyBody` and `PolicyAttribute` stay local. `sdk.PolicyObject` declares `Body` as an anonymous struct over an unexported element type, so there is no nameable sdk equivalent to alias to. Exporting those in `sdk` first would make the alias possible; that is a separate change. `IntegrityAlgorithm` stays a distinct `int` type. `sdk.IntegrityAlgorithm` is itself `= int`, so no method can be attached to it, and aliasing would silently drop `String()` from this package's public API. The underlying values match, so the two convert freely. `kSplitKeyType`, `kPolicyBindingAlg`, `kGMACPayloadLength` and `calculateSignature` are retained verbatim: this package still builds its own manifests and they have callers in `writer.go` and `key_access.go`. The change that removes those callers removes these too. No behavior change. The package's existing tests pass unmodified. ### Checklist - [ ] I have added or updated unit tests - [ ] I have added or updated integration tests (if appropriate) - [ ] I have added or updated documentation ### Testing Instructions ``` cd sdk && go test ./experimental/... -race ``` No behavior change — the point is that the package's existing tests pass unmodified against aliased types. <details> <summary><b>The full DSPX-2604 stack — 20 PRs</b></summary> | # | PR | Based on | |---|----|----------| | 01 | #3930 chore: bump go.work toolchain to go1.25.12 and simplify an rt_test condition | `main` | | 02 | #3931 feat(sdk): make the zipstream clock injectable for deterministic ZIP output | `main` | | 03 | #3932 fix(sdk): reject a zipstream write set that omits segment 0 | #3931 | | 04 | #3933 fix(sdk): map ReadAt plaintext offsets from cumulative segment sizes | `main` | | 05 | #3934 chore(sdk): extract integrityAlgorithmString, createPolicyBinding, signAssertions | `main` | | 06 | #3935 chore(sdk): add direct tests for createKeyAccess, encryptMetadata and tdfSalt | `main` | | 07 | #3936 fix(sdk): fill each segment with io.ReadFull and size the buffer to the input | `main` | | 08 | #3937 chore(cli): move streaming IO helpers into pkg | `main` | | 09 | #3938 fix(cli): stream encrypt instead of buffering the whole payload | #3937 | | 10 | #3939 fix(cli): stream decrypt and inspect instead of buffering | #3938 | | 11 | #3940 feat(sdk): add a chunked segment writer (experimental) | `dspx-2604-base-11` = #3932 + #3934 + #3935 | | 12 | #3941 fix(sdk): stop GetManifest from splitting the key under the lock | #3940 | | 13 | #3942 fix(sdk): reject a chunked split naming a KAS with no resolved public key | #3941 | | 14 | #3943 chore(sdk): alias experimental/tdf manifest and assertion types | #3942 | | 15 | #3944 fix(sdk): emit spec-compliant key access in experimental/tdf and delegate Writer | #3943 | | 16 | #3945 feat(sdk): accept io.Reader in CreateTDF and drop the 64 GB payload cap | #3936 | | 17 | #3946 chore(sdk): rewrite CreateTDF on top of the chunked writer | `dspx-2604-base-17` = #3944 + #3945 | | 18 | #3947 chore(sdk): drop dead TDFConfig fields and deprecate the TDFFormat enum | #3946 | | 19 | #3948 fix(cli): drop the encrypt-side stdin spool | `dspx-2604-base-19` = #3947 + #3939 | | 20 | #3949 feat(sdk): graduate the chunked writer to stable API | #3948 | **Reviewable in parallel right now**, since they sit directly on `main` and depend on nothing else: 01, 02, 04, 05, 06, 07, 08. **Why three PRs have a `dspx-2604-base-*` base.** A GitHub PR takes one base branch, but 11, 17 and 19 each build on more than one parent. The `base-*` branches are empty merge commits that exist only to join those parents so the PR diff shows exactly its own change and nothing else. They contain no code, have no PR of their own, and go away once their parents land — retarget the child onto `main` at that point. **Wants a cross-SDK xtest run before merge:** 15, 17 (and therefore 20). They touch the KAS wire format. **Red checks you may see are network flakes, not this stack.** Four distinct ones hit this batch and all clear on re-run: `golangci-lint config verify` timing out on `https://golangci-lint.run/.../golangci.v2.8.jsonschema.json` (fails the whole `go (<module>)` job and fail-fast cancels its siblings), the bats installer getting a 403, Docker Hub timing out on `keycloak/keycloak:26.4`, and `buf` reporting "the server hosted at that remote is unavailable" while the Java SDK generates sources. The `govulncheck` step also emits `##[error]` annotations against the go1.25.11 stdlib, but it is `continue-on-error: true` and never fails a job — 01 bumps the toolchain and clears those annotations. </details> <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Compatibility** * Experimental TDF manifest and assertion types now align with the stable SDK, enabling direct interoperability without type conversion. * Existing assertion and manifest behavior is provided through the stable SDK definitions. * **Documentation** * Clarified the relationship between the experimental TDF package and the stable SDK. * Updated documentation for missing assertion verification keys to reflect current behavior. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
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Proposed Changes
otdfctl decryptread the whole TDF into memory, handed the slice toDecryptBytes, which accumulated the whole plaintext in a bytes.Buffer, and then
-- for stdout -- called Buffer.String(), allocating a third full copy. Peak RSS
was roughly 3.6x the payload; a 1 GiB file cost ~3.7 GiB of RAM and a large
enough file simply OOMed on a machine with plenty of disk for it.
The plaintext now streams from the SDK reader to the destination. Handler.Decrypt
takes an io.ReadSeeker and an io.Writer, with DecryptOptions replacing the
positional parameter list, and inspect reaches the manifest through the same
seekable reader rather than buffering the archive to get at its tail.
io.Copy is what does the streaming, and it does so only because sdk.Reader
implements WriteTo, which decrypts one segment at a time. Its Read delegates to
ReadAt, which grows an internal bytes.Buffer holding every segment decrypted so
far -- so dropping WriteTo would silently restore the old memory profile with no
test failure to show for it. A compile-time assertion pins the interface.
Removes MaxFileSize. The 10 GB cap existed to bound RAM; the real limit is the
SDK maxFileSizeSupported at 64 GiB, which enforces itself.
Output to a file is atomic, as on the encrypt side: the plaintext goes to a
temporary sibling and is renamed into place only on success. Since
cli.ExitWithError calls os.Exit and skips deferred functions, the spooled input
and the partial output are discarded explicitly on every exit path -- including
inspect's success path, which exits through ExitWithJSON.
e2e coverage lands in a new otdfctl/e2e/streaming.bats rather than in
encrypt-decrypt.bats, which carries a file-level skip pending the
namespaced-subject-mappings migration and would have swallowed the new cases
without running them. Nothing in the new file needs an entitlement, so it needs
no policy fixtures: the round-trips use no attributes, and the two failure cases
are forced with an unresolvable attribute FQN and a KAS allowlist that excludes
the platform. As of this change it is the only e2e coverage of encrypt, decrypt
and inspect that actually executes in CI.
The file is tagged payload_streaming and action.yaml gives it its own pass
ahead of the parallel batch. That ordering is load-bearing, not tidiness. An
encrypt with no attributes falls back to the platform base key, and
key-base.bats sets one pointing at https://test-kas-for-base-keys.com, which
does not resolve. It cannot put things back afterwards: a base key can be
replaced but never cleared, so every unattributed encrypt scheduled after that
file yields a TDF nothing can decrypt. Under --jobs 4 the file order is
nondeterministic, so overlapping the two made this suite flaky rather than
merely broken -- which is how it presented, a different subset of round-trips
failing per run. Running alone also keeps the 1 GiB peak-RSS case from
measuring itself against three neighbours competing for the same memory.
That leak is worth closing on its own -- encrypt-decrypt.bats walks into it the
day its skip is lifted -- but the fix belongs with the file that opens it
rather than here.
Checklist
Testing Instructions
e2e, against a running platform:
The first CI run of this file failed 308–311 and 317, all of them the cases
that need a successful decrypt. Cause was not the code under test: an encrypt
with no attributes falls back to the platform base key, and
key-base.batssets one pointing at
https://test-kas-for-base-keys.com, which does notresolve — and cannot unset it, because a base key can only be replaced. Under
--jobs 4the file order is nondeterministic, so which subset failed variedper run. Fixed here by tagging the file
payload_streamingand giving it itsown pass before the parallel batch. Tag arithmetic checks out: 14 + 10 + 330 =
354, the same total as before.
The memory case needs GNU
time(gtimeon macOS) and skips without it. Itallocates a 1 GiB file; peak RSS was ~3.6 GiB per command before this change
and the assertion threshold is 512 MiB.
The full DSPX-2604 stack — 20 PRs
mainmainmainmainmainmainmaindspx-2604-base-11= #3932 + #3934 + #3935dspx-2604-base-17= #3944 + #3945dspx-2604-base-19= #3947 + #3939Reviewable in parallel right now, since they sit directly on
mainand depend onnothing else: 01, 02, 04, 05, 06, 07, 08.
Why three PRs have a
dspx-2604-base-*base. A GitHub PR takes one base branch,but 11, 17 and 19 each build on more than one parent. The
base-*branches are emptymerge commits that exist only to join those parents so the PR diff shows exactly its
own change and nothing else. They contain no code, have no PR of their own, and go
away once their parents land — retarget the child onto
mainat that point.Wants a cross-SDK xtest run before merge: 15, 17 (and therefore 20). They touch
the KAS wire format.
Red checks you may see are network flakes, not this stack. Four distinct ones hit
this batch and all clear on re-run:
golangci-lint config verifytiming out onhttps://golangci-lint.run/.../golangci.v2.8.jsonschema.json(fails the wholego (<module>)job and fail-fast cancels its siblings), the bats installer getting a 403,Docker Hub timing out on
keycloak/keycloak:26.4, andbufreporting "the serverhosted at that remote is unavailable" while the Java SDK generates sources. The
govulncheckstep also emits##[error]annotations against the go1.25.11 stdlib, butit is
continue-on-error: trueand never fails a job — 01 bumps the toolchain andclears those annotations.
Summary by CodeRabbit
New Features
Bug Fixes