fix(cli): drop the encrypt-side stdin spool - #3948
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe encryption handler and CLI accept non-seekable readers. MIME detection preserves the payload, and regular-file inputs remain seekable without spooling. Tests cover reader behavior, ZIP32 and ZIP64 output, and decryption. ChangesStreaming encryption input
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant CLI as Encryption CLI
participant Detect as MIME detection
participant Handler as Encryption handler
CLI->>Detect: Pass selected input reader
Detect->>Handler: Return MIME type and payload reader
Handler->>CLI: Write encrypted output
Suggested reviewers: Merge Risk: ⚪ Minimal · up to Readable files that report zero size are no longer treated as absent input. The change is mergeable after normal checks. Security Architecture ReviewSecurity architecture risk: 🔵 Low · up to Streaming removes the need for temporary plaintext storage. It also means a failed input stream can leave partial encrypted bytes on stdout or another direct destination. Ordinary output files remain protected from publication on failure; no new authorization bypass was established. Retained concerns
Security review detailsSecurity Blast Radius
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In `@otdfctl/cmd/tdf/encrypt.go`:
- Around line 119-140: Update resolveEncryptInput to detect named regular files
that report size zero and return their contents through a non-seekable reader,
preserving the file cleanup callback; keep other named files seekable.
In `@otdfctl/pkg/streamio/input.go`:
- Around line 54-60: Update the regular-file fast path in the input reader to
use it only when the reported size is positive; route size-zero files through
the existing buffered Peek fallback so their content is detected and read.
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otdfctl/cmd/tdf/decrypt.gootdfctl/cmd/tdf/encrypt.gootdfctl/cmd/tdf/encrypt_test.gootdfctl/cmd/tdf/inspect.gootdfctl/e2e/streaming.batsotdfctl/pkg/handlers/tdf.gootdfctl/pkg/streamio/input.gootdfctl/pkg/streamio/input_test.go
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DSPX-4499 fixed encrypt's OOM by streaming, but CreateTDF still required an io.ReadSeeker, so piped stdin had to be spooled to a temporary file first. That traded the whole-payload allocation for a disk write and a writable TMPDIR -- better, but not the point. Now that CreateTDF takes an io.Reader, the pipe goes straight to the SDK. What is spooled is decided by what the fd actually is, not by which argument it arrived through. A file argument and a shell redirect from a regular file both seek, so both reach the SDK unwrapped; only a genuine stream is buffered. The SDK measures whatever it can seek, and under ~2 GiB that keeps the archive in the compact ZIP32 layout; an unmeasurable payload has to be ZIP64, because the choice is baked into the payload's local file header before the first segment goes out. So `encrypt file.txt` and `encrypt < file.txt` are unchanged byte for byte, and `... | encrypt` produces a slightly larger TDF than it did when it was spooled. That is the trade, and it is the right way round: nobody should need a writable temp directory to encrypt a stream. Measurability is worth a second thing the archive layout does not show: the SDK fails a measured payload whose reader runs dry early, rather than returning a TDF that is silently short. A pipe has no declared length to check against. handlers.Handler's Encrypt is now the one place that states both, including that sdk.WithInputSize could restore the check for a caller who knows the length and that otdfctl does not expose it. The same distinction reaches decrypt and inspect, which spool because a TDF's manifest lives at the end of the archive. A redirect from a regular file is seekable already, so they read it in place rather than copying the whole TDF into TMPDIR to get a seekable view of it. MIME sniffing is what made this more than a deletion. It reads the first megabyte and previously seeked back to zero, which a pipe cannot do. Wrapping the input in a bufio.Reader is not an option either -- that hides the Seeker and would silently flip every file encrypt to ZIP64. detectMimeType now returns a reader alongside the type: the input itself, restored to the offset it was handed over at, when it can be; the sniffed prefix pushed back with io.MultiReader when it cannot. A megabyte in memory at most, and only when --mime-type was not given. Restoring the saved offset rather than seeking to zero matters once a redirect stays seekable: stdin arrives part-consumed whenever a wrapper reads a header before exec'ing us, and the payload is what remains, not the whole file. Rewindability is decided by attempting the seek, not by asserting io.Seeker. An *os.File on a FIFO, a process substitution, or /dev/stdin on the end of a pipe satisfies the interface and then returns ESPIPE, and treating that as fatal made `encrypt <(echo hi)` fail while `encrypt --mime-type text/plain <(echo hi)` succeeded -- a manifest-shaping flag deciding whether the command ran at all. A failed lseek leaves the offset untouched, so replaying the prefix is always correct. resolveInputSize in sdk/tdf.go already drew the same line. Input resolution moves into resolveEncryptInput so the ZIP32 invariant can be asserted without a running platform. That invariant lives in encryptRun, not in detectMimeType: anything wrapping the file between there and CreateTDF would flip every file encrypt to ZIP64 with the unit suite still green. encryptRun probes it the same way the SDK does, so the "this will be ZIP64" breadcrumb is logged once and is right whether or not detection ran -- --mime-type skips detectMimeType entirely, and that was the path on which an input that satisfies io.Seeker and then refuses reached the SDK unremarked. Testing: TestDetectMimeTypePreservesThePayload runs each case over all three reader shapes -- rewindable, Seek hidden, Seek refused with ESPIPE -- asserting both that the payload arrives whole and that only the first comes back measurable. Cases added for a payload of exactly the sniff window, the shortest input that fills the buffer and the boundary at which replaying the prefix could duplicate or drop a byte; for a reader handed over mid-payload, which must be restored to where it was rather than to zero; and for a read that fails partway, which must abort rather than encrypt a truncated payload. TestDetectMimeTypeKeepsSeekability guards the ZIP32 layout directly, since nothing else would fail if a file came back wrapped. streamio gains regular-file stdin coverage it never had: the file comes back unwrapped with its offset untouched, an empty or fully-consumed one still reports absent, and OpenSeekable hands it over without creating a spool. e2e gains "encrypt measures a file and streams a pipe", which reads the local file header's extra field length to tell the two layouts apart -- both forms round-trip, so a quiet return to spooling would show up nowhere else -- now covering the redirect alongside the file and the pipe. A process-substitution case covers the ESPIPE path end to end, with and without --mime-type, which unit tests can only reach through a hand-written fake. The multi-segment case uses a real pipe rather than a redirect, since a redirect is now measured; 3 MiB clears the SDK's 2 MiB segment size, so the archive spans several segments whose hashes have to be combined on the way out and verified on the way back in. Decrypt from stdin is split into a piped case, which still spools and must remove the spool, and a redirect case, which no longer spools at all. extra_field_len fails rather than returning a number when it cannot read a full header: empty od output makes bash evaluate the arithmetic to 0, which is exactly the value the ZIP32 assertion passes on, so a missing archive would have looked like a pass. Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
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Proposed Changes
DSPX-4499 fixed encrypt's OOM by streaming, but CreateTDF still required an
io.ReadSeeker, so piped stdin had to be spooled to a temporary file first. That
traded the whole-payload allocation for a disk write and a writable TMPDIR --
better, but not the point. Now that CreateTDF takes an io.Reader, the pipe goes
straight to the SDK.
A file is still opened seekably, on purpose. The SDK measures a seekable
payload and keeps the archive in the compact ZIP32 layout; an unmeasurable one
has to be ZIP64, because the choice is baked into the payload's local file
header before the first segment goes out. So
encrypt file.txtis unchangedbyte for byte, and
... | encryptproduces a slightly larger TDF than it didwhen it was spooled. That is the trade, and it is the right way round: nobody
should need a writable temp directory to encrypt a stream.
MIME sniffing is what made this more than a deletion. It reads the first
megabyte and previously seeked back to zero, which a pipe cannot do. Wrapping
the input in a bufio.Reader is not an option either -- that hides the Seeker
and would silently flip every file encrypt to ZIP64. detectMimeType now returns
a reader alongside the type: the same reader for a seekable input, rewound; the
sniffed prefix pushed back with io.MultiReader for anything else. A megabyte in
memory at most, and only when --mime-type was not given.
Testing: TestDetectMimeTypePreservesThePayload now runs each case twice, once
over a reader whose Seek method is hidden, and asserts the payload arrives
whole either way. TestDetectMimeTypeKeepsSeekability guards the ZIP32 layout
directly, since nothing else would fail if a file came back wrapped. e2e gains
"encrypt measures a file and streams a pipe", which reads the local file
header's extra field length to tell the two layouts apart -- both forms
round-trip, so a quiet return to spooling would show up nowhere else.
Checklist
Testing Instructions
e2e, against a running platform:
The file is tagged
payload_streamingand runs in its own pass ahead of theparallel batch — see #3939 for why that ordering is load-bearing (the platform
base key
key-base.batssets cannot be un-set, and breaks every unattributedencrypt scheduled after it).
The case to look at is
encrypt measures a file and streams a pipe, whichasserts the ZIP layout rather than the round trip: a file must stay ZIP32
(extra field length 0 at offset 28 of the payload's local file header) and a
pipe must be ZIP64 (non-zero). A quiet return to spooling would show up nowhere
else, since both forms round-trip fine.
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.
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