fix(cli): restrict decrypted output permissions - #4037
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Signed-off-by: strantalis <strantalis@virtru.com>
📝 WalkthroughWalkthroughThe change makes ChangesSecure output handling
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~15 minutes Change: Bug fix Suggested reviewers: Merge Risk: 🔵 Low · up to Decrypted output permissions are security-sensitive. Add a command-level regression test to ensure decrypt output remains private. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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strantalis
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September 11, 2026 18:10
strantalis
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September 11, 2026 18:14
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In `@otdfctl/cmd/tdf/decrypt.go`:
- Line 89: Add a reachable command-level regression test for decrypting with the
--out option, asserting that the resulting committed output file has permission
mode 0o600. Place it in the active test suite rather than the disabled BATS
suite and exercise the real decrypt command path.
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📒 Files selected for processing (3)
otdfctl/cmd/tdf/decrypt.gootdfctl/pkg/streamio/output.gootdfctl/pkg/streamio/output_test.go
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jakedoublev
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Sep 14, 2026
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Sep 14, 2026
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September 14, 2026 16:04
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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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`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
0600.Fixes DSPX-4696.
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make lintstops atbuf lint servicebecause the configured Buf API token is invalid.make testreaches unrelated integration suites, then fails because Colima/Docker, Keycloak, and the local platform service are unavailable.Summary by CodeRabbit
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