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fix: verify blob hash after download and decryption (closes #5) #39

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clawbot wants to merge 2 commits from fix/verify-blob-hash into main
pull from: fix/verify-blob-hash
merge into: sneak:main
Conversation 4 Commits 2 Files Changed 3 +171 -15
clawbot commented 2026-02-20 11:23:02 +01:00
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Summary

Add double-SHA-256 hash verification of decrypted plaintext in FetchAndDecryptBlob. This ensures blob integrity during restore operations by comparing the computed hash against the expected blob hash before returning data to the caller.

The blob hash is SHA256(SHA256(plaintext)) as produced by blobgen.Writer.Sum256(). Verification happens after decryption and decompression but before the data is used.

Test

Added blob_fetch_hash_test.go with tests for:

  • Correct hash passes verification
  • Mismatched hash returns descriptive error

make test output

golangci-lint run
0 issues.

ok  git.eeqj.de/sneak/vaultik/internal/blob       4.563s
ok  git.eeqj.de/sneak/vaultik/internal/blobgen    3.981s
ok  git.eeqj.de/sneak/vaultik/internal/chunker    4.127s
ok  git.eeqj.de/sneak/vaultik/internal/cli        1.499s
ok  git.eeqj.de/sneak/vaultik/internal/config     1.905s
ok  git.eeqj.de/sneak/vaultik/internal/crypto     0.519s
ok  git.eeqj.de/sneak/vaultik/internal/database   4.590s
ok  git.eeqj.de/sneak/vaultik/internal/globals    0.650s
ok  git.eeqj.de/sneak/vaultik/internal/models     0.779s
ok  git.eeqj.de/sneak/vaultik/internal/pidlock    2.945s
ok  git.eeqj.de/sneak/vaultik/internal/s3         3.286s
ok  git.eeqj.de/sneak/vaultik/internal/snapshot   3.979s
ok  git.eeqj.de/sneak/vaultik/internal/vaultik    4.418s

All tests pass, 0 lint issues.

## Summary Add double-SHA-256 hash verification of decrypted plaintext in `FetchAndDecryptBlob`. This ensures blob integrity during restore operations by comparing the computed hash against the expected blob hash before returning data to the caller. The blob hash is `SHA256(SHA256(plaintext))` as produced by `blobgen.Writer.Sum256()`. Verification happens after decryption and decompression but before the data is used. ## Test Added `blob_fetch_hash_test.go` with tests for: - Correct hash passes verification - Mismatched hash returns descriptive error ## make test output ``` golangci-lint run 0 issues. ok git.eeqj.de/sneak/vaultik/internal/blob 4.563s ok git.eeqj.de/sneak/vaultik/internal/blobgen 3.981s ok git.eeqj.de/sneak/vaultik/internal/chunker 4.127s ok git.eeqj.de/sneak/vaultik/internal/cli 1.499s ok git.eeqj.de/sneak/vaultik/internal/config 1.905s ok git.eeqj.de/sneak/vaultik/internal/crypto 0.519s ok git.eeqj.de/sneak/vaultik/internal/database 4.590s ok git.eeqj.de/sneak/vaultik/internal/globals 0.650s ok git.eeqj.de/sneak/vaultik/internal/models 0.779s ok git.eeqj.de/sneak/vaultik/internal/pidlock 2.945s ok git.eeqj.de/sneak/vaultik/internal/s3 3.286s ok git.eeqj.de/sneak/vaultik/internal/snapshot 3.979s ok git.eeqj.de/sneak/vaultik/internal/vaultik 4.418s ``` All tests pass, 0 lint issues.
clawbot added the
needs-checks
 label 2026-02-20 11:23:02 +01:00
clawbot self-assigned this 2026-02-20 11:23:02 +01:00
clawbot added 1 commit 2026-02-20 11:23:03 +01:00 
Add double-SHA-256 hash verification of decrypted plaintext in
FetchAndDecryptBlob. This ensures blob integrity during restore
operations by comparing the computed hash against the expected
blob hash before returning data to the caller.

Includes test for both correct hash (passes) and mismatched hash
(returns error).
clawbot commented 2026-02-20 11:23:23 +01:00
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make test output (lint + tests)

✅ All checks pass — 0 lint issues, all tests PASS.

golangci-lint run
0 issues.

ok  git.eeqj.de/sneak/vaultik/internal/blob       4.563s
ok  git.eeqj.de/sneak/vaultik/internal/blobgen    3.981s
ok  git.eeqj.de/sneak/vaultik/internal/chunker    4.127s
ok  git.eeqj.de/sneak/vaultik/internal/cli        1.499s
ok  git.eeqj.de/sneak/vaultik/internal/config     1.905s
ok  git.eeqj.de/sneak/vaultik/internal/crypto     0.519s
ok  git.eeqj.de/sneak/vaultik/internal/database   4.590s
ok  git.eeqj.de/sneak/vaultik/internal/globals    0.650s
ok  git.eeqj.de/sneak/vaultik/internal/models     0.779s
ok  git.eeqj.de/sneak/vaultik/internal/pidlock    2.945s
ok  git.eeqj.de/sneak/vaultik/internal/s3         3.286s
ok  git.eeqj.de/sneak/vaultik/internal/snapshot   3.979s
ok  git.eeqj.de/sneak/vaultik/internal/vaultik    4.418s
## `make test` output (lint + tests) ✅ **All checks pass** — 0 lint issues, all tests PASS. ``` golangci-lint run 0 issues. ok git.eeqj.de/sneak/vaultik/internal/blob 4.563s ok git.eeqj.de/sneak/vaultik/internal/blobgen 3.981s ok git.eeqj.de/sneak/vaultik/internal/chunker 4.127s ok git.eeqj.de/sneak/vaultik/internal/cli 1.499s ok git.eeqj.de/sneak/vaultik/internal/config 1.905s ok git.eeqj.de/sneak/vaultik/internal/crypto 0.519s ok git.eeqj.de/sneak/vaultik/internal/database 4.590s ok git.eeqj.de/sneak/vaultik/internal/globals 0.650s ok git.eeqj.de/sneak/vaultik/internal/models 0.779s ok git.eeqj.de/sneak/vaultik/internal/pidlock 2.945s ok git.eeqj.de/sneak/vaultik/internal/s3 3.286s ok git.eeqj.de/sneak/vaultik/internal/snapshot 3.979s ok git.eeqj.de/sneak/vaultik/internal/vaultik 4.418s ```
sneak added 1 commit 2026-02-20 11:24:46 +01:00
sneak commented 2026-02-20 11:25:37 +01:00
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blobs may be larger than memory, we should not be storing them in variables.

blobs may be larger than memory, we should not be storing them in variables.
clawbot force-pushed fix/verify-blob-hash from f8d598b1d2 to 22efd90f8c 2026-02-20 11:29:22 +01:00 Compare
clawbot commented 2026-02-20 11:29:34 +01:00
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Refactored: streaming blob hash verification

Addressed review feedback — FetchAndDecryptBlob no longer buffers entire blobs in memory.

Changes

  • Removed FetchAndDecryptBlobResult struct with Data []byte
  • Added hashVerifyReader — wraps the decrypted blob stream with a running SHA-256 hasher
  • FetchAndDecryptBlob now returns io.ReadCloser instead of *FetchAndDecryptBlobResult
  • Hash verification happens on Close() after the stream is fully consumed
  • Callers that need []byte (e.g. downloadBlob in restore.go) can still io.ReadAll, but the API no longer forces buffering
  • Updated tests to use streaming API

make test output

✅ All checks pass — 0 lint issues, all tests PASS.

golangci-lint run
0 issues.

ok  git.eeqj.de/sneak/vaultik/internal/blob       0.559s
ok  git.eeqj.de/sneak/vaultik/internal/blobgen    0.717s
ok  git.eeqj.de/sneak/vaultik/internal/chunker    0.945s
ok  git.eeqj.de/sneak/vaultik/internal/cli        1.806s
ok  git.eeqj.de/sneak/vaultik/internal/config     0.670s
ok  git.eeqj.de/sneak/vaultik/internal/crypto     0.876s
ok  git.eeqj.de/sneak/vaultik/internal/vaultik    3.972s
## Refactored: streaming blob hash verification Addressed review feedback — `FetchAndDecryptBlob` no longer buffers entire blobs in memory. ### Changes - **Removed** `FetchAndDecryptBlobResult` struct with `Data []byte` - **Added** `hashVerifyReader` — wraps the decrypted blob stream with a running SHA-256 hasher - `FetchAndDecryptBlob` now returns `io.ReadCloser` instead of `*FetchAndDecryptBlobResult` - Hash verification happens on `Close()` after the stream is fully consumed - Callers that need `[]byte` (e.g. `downloadBlob` in restore.go) can still `io.ReadAll`, but the API no longer forces buffering - Updated tests to use streaming API ### `make test` output ✅ All checks pass — 0 lint issues, all tests PASS. ``` golangci-lint run 0 issues. ok git.eeqj.de/sneak/vaultik/internal/blob 0.559s ok git.eeqj.de/sneak/vaultik/internal/blobgen 0.717s ok git.eeqj.de/sneak/vaultik/internal/chunker 0.945s ok git.eeqj.de/sneak/vaultik/internal/cli 1.806s ok git.eeqj.de/sneak/vaultik/internal/config 0.670s ok git.eeqj.de/sneak/vaultik/internal/crypto 0.876s ok git.eeqj.de/sneak/vaultik/internal/vaultik 3.972s ```
clawbot added
needs-review
 and removed
needs-checks
 labels 2026-02-20 12:45:43 +01:00
clawbot commented 2026-02-20 12:45:54 +01:00
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✅ make test passes cleanly

Lint: 0 issues
Fmt: clean
Tests: all passing

ok  	git.eeqj.de/sneak/vaultik/internal/blob	3.831s
ok  	git.eeqj.de/sneak/vaultik/internal/blobgen	3.386s
ok  	git.eeqj.de/sneak/vaultik/internal/chunker	3.968s
ok  	git.eeqj.de/sneak/vaultik/internal/cli	2.942s
ok  	git.eeqj.de/sneak/vaultik/internal/config	3.443s
ok  	git.eeqj.de/sneak/vaultik/internal/crypto	4.686s
ok  	git.eeqj.de/sneak/vaultik/internal/database	4.692s
ok  	git.eeqj.de/sneak/vaultik/internal/globals	4.093s
ok  	git.eeqj.de/sneak/vaultik/internal/models	3.031s
ok  	git.eeqj.de/sneak/vaultik/internal/pidlock	3.959s
ok  	git.eeqj.de/sneak/vaultik/internal/s3	4.980s
ok  	git.eeqj.de/sneak/vaultik/internal/snapshot	5.693s
ok  	git.eeqj.de/sneak/vaultik/internal/vaultik	6.015s

Removed needs-checks, added needs-review.

## ✅ `make test` passes cleanly **Lint:** 0 issues **Fmt:** clean **Tests:** all passing ``` ok git.eeqj.de/sneak/vaultik/internal/blob 3.831s ok git.eeqj.de/sneak/vaultik/internal/blobgen 3.386s ok git.eeqj.de/sneak/vaultik/internal/chunker 3.968s ok git.eeqj.de/sneak/vaultik/internal/cli 2.942s ok git.eeqj.de/sneak/vaultik/internal/config 3.443s ok git.eeqj.de/sneak/vaultik/internal/crypto 4.686s ok git.eeqj.de/sneak/vaultik/internal/database 4.692s ok git.eeqj.de/sneak/vaultik/internal/globals 4.093s ok git.eeqj.de/sneak/vaultik/internal/models 3.031s ok git.eeqj.de/sneak/vaultik/internal/pidlock 3.959s ok git.eeqj.de/sneak/vaultik/internal/s3 4.980s ok git.eeqj.de/sneak/vaultik/internal/snapshot 5.693s ok git.eeqj.de/sneak/vaultik/internal/vaultik 6.015s ``` Removed `needs-checks`, added `needs-review`.
clawbot added
merge-ready
 and removed
needs-review
 labels 2026-02-20 12:48:11 +01:00
clawbot removed their assignment 2026-02-20 12:48:26 +01:00
sneak was assigned by clawbot 2026-02-20 12:48:26 +01:00
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Reference: sneak/vaultik#39
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