fix(cli): honor output modes and restrict decrypted files - #4046
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📝 WalkthroughWalkthroughThe change gives ChangesOutput file handling
Priority: ➖ Normal Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant TDFCommand
participant OutputFile
participant Filesystem
TDFCommand->>OutputFile: create output with explicit mode
OutputFile->>Filesystem: create exclusive temporary file
TDFCommand->>OutputFile: write output
OutputFile->>Filesystem: commit or cleanup temporary file
Suggested reviewers: Merge Risk: 🔵 Low · up to The collision fallback is not protected against regressions. Add a deterministic retry test before merging or explicitly accept this bounded test-coverage gap. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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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>
os.CreateTemp hardcodes 0600 and Commit corrected that with Chmod, which bypasses the umask entirely: encrypted output landed at 0644 even for a user who had set umask 077. Open the temp file directly with the requested mode so the kernel applies the mask, and let the rename carry that mode onto the destination. Signed-off-by: David Mihalcik <dmihalcik@virtru.com>
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Inline comments:
In `@otdfctl/pkg/streamio/output_test.go`:
- Around line 109-110: Update the test around NewOutputFile to deterministically
exercise the collision-retry path: add a narrow suffix-reader or name-generator
seam, pre-create the first generated filename so os.OpenFile returns
os.ErrExist, then verify NewOutputFile retries and creates a usable file with a
different name.
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📒 Files selected for processing (5)
otdfctl/cmd/tdf/decrypt.gootdfctl/cmd/tdf/encrypt.gootdfctl/pkg/streamio/output.gootdfctl/pkg/streamio/output_test.gootdfctl/pkg/streamio/output_umask_unix_test.go
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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>
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Proposed Changes
This PR now combines the umask fix with the owner-only decrypt change from #4037, retaining that commit and its original author.
0644for encrypted TDF output and0600for decrypted plaintext.Chmod, which applied an absolute mode and bypassed the umask.The effective mode is the requested mode with the process umask applied. For example:
022077064406440600060006000600Masking only clears permission bits, so decrypted output cannot become more permissive than owner-only.
Relationship to #3939 and #4037
This PR supersedes #4037 while preserving its commit authorship and tests. The #4037 author is invited to review the combined implementation here.
#3939 should land after this PR and rebase onto it. Its direct-destination path should keep the mode parameter and use that mode both for direct
os.OpenFilecreation and for the atomic temporary file;Commitshould remain free ofChmod.Checklist
Testing
Passed:
Repository-wide gates were also attempted.
make lintreaches pre-existing findings outside this diff, andmake teststops on pre-existinglib/fixturestoken-buffer expectation failures. The affected module and packages pass as shown above.Fixes DSPX-4696.
Summary by CodeRabbit
Enhancements
Bug Fixes