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sneak/mfer:main sneak/mfer:issue-166-readme-format-spec-link sneak/mfer:next sneak/mfer:issue-116-gomodguard
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Branches Tags
sneak/mfer:issue-166-readme-format-spec-link sneak/mfer:next sneak/mfer:issue-116-gomodguard sneak/mfer:main
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215de1f857 ... next
Author SHA1 Message Date
clawbot 4fe1ff2fe1 Refuse a path listed twice in a manifest (closes #170)
check / check (push) Waiting to run
Details 
gen given arguments whose files share a path, such as gen a b with a.txt
in both, or gen . ., now fails while listing the files, before hashing
any, naming the path and both files. Builder.AddFile and
Builder.AddFileWithHash refuse a path already added. Loading refuses a
manifest that lists a path twice, compared byte for byte; fetch keeps
its own letter-case check. The Path Rules in docs/FORMAT.md say each
path appears at most once. The decode-size test listed one path 1000
times; each entry now has its own path of the same length.

Model: opus-5-5
 2026-10-07 15:28:57 +02:00
clawbot 01ff67a38e Refuse a manifest whose inner message version is not one (closes #169)
check / check (push) Waiting to run
Details 
Loading a manifest checked only the outer message's version, so an
inner message of version 0 or a later version loaded as if it were
version one, although docs/FORMAT.md requires VERSION_ONE in both.
deserializeInner now refuses any other inner version with the same
error as an unknown outer version. Two existing tests built inner
messages with no version and expected them to load; they now write
version one.

Model: opus-5-5
 2026-10-07 15:25:47 +02:00
clawbot f663f4242d Limit how much fetch and check read for a manifest or a file (closes #168)
check / check (push) Waiting to run
Details 
NewManifestFromReader reads at most one byte past MaxManifestSize, a new
constant of 258 MiB: the 256 MiB decompressed limit grown by zstd's worst
case of 1/256, plus 1 MiB for the signature, the signing key and the
other outer fields. It refuses a larger manifest. fetch, and check given
a URL, stop downloading a manifest one byte past the same size and report
it as too large; tests lower that size to keep their memory small. fetch
stops reading a file one byte past its listed size, so a longer body ends
in the size mismatch at once instead of filling the disk. docs/FORMAT.md
states the limit and gives the decompressed limit as 256 MiB, the size
the code uses.

Model: opus-5-5
 2026-10-07 14:25:45 +02:00
clawbot 0762a728d4 Compare --require-signature with the key that signed (closes #167)
check / check (push) Waiting to run
Details 
check and fetch --require-signature compared the required fingerprint
with the first key in the manifest's embedded public key block, while
gpg accepted a good signature by any key in that block.

Loading a signed manifest now refuses one whose embedded block holds
more than one primary key, counted as gpg reads the block, or whose
signer field is not the primary key fingerprint gpg reports for the
signature. --require-signature compares with the signer field, which
loading has checked. Signing names and embeds the key gpg reports it
signed with, so a key ID matching several keys still writes a manifest
that loads. docs/FORMAT.md states what a verifier checks.

Model: opus-5-5
 2026-10-07 13:59:17 +02:00
clawbot 2a174e3ba2 Raise Go to the latest release, update dependencies, use the standard library uuid, add a vulnerability check (closes #102)
check / check (push) Failing after 3s
Details 
Go 1.27.1 in go.mod and in the Dockerfile's test and build images.
Every module go.mod requires is at its current release; protoc-gen-go
follows protobuf to v1.36.12 and mf.pb.go is regenerated. The standard
library uuid package replaces github.com/google/uuid; FromBytes could
only fail on a length validateUUID already checks, so that call and its
unreachable error are gone. make vulncheck runs govulncheck v1.8.0,
installed with go install at its release commit, in a vulncheck stage
of the Dockerfile; script/check does not run it. The newer go directive
switches on lint checks for strings.SplitSeq and t.Chdir, now used. A
new test pins the bytes of a seeded manifest written by an mfer built
before this change.

Model: opus-5-5
 2026-10-06 20:26:15 +02:00
30 changed files with 1019 additions and 755 deletions
Expand all files Collapse all files
Dockerfile
+17 -5
View File
@@ -11,8 +11,8 @@ RUN golangci-lint run --config .golangci.yml ./...
# Test phase. -race needs cgo and so a C compiler, which the Debian Go # Test phase. -race needs cgo and so a C compiler, which the Debian Go
# image ships and the alpine one does not. # image ships and the alpine one does not.
# golang:1.23.12, 2026-03-14 # golang:1.27.1, 2026-10-06
FROM golang@sha256:60deed95d3888cc5e4d9ff8a10c54e5edc008c6ae3fba6187be6fb592e19e8c0 AS test FROM golang@sha256:1e93e00a31255c07e9a34c4207f3006e1501730c5323697cee7dfb827fdae44c AS test
WORKDIR /src WORKDIR /src
COPY go.mod go.sum ./ COPY go.mod go.sum ./
RUN go mod download RUN go mod download
@@ -21,12 +21,24 @@ RUN go test -timeout 90s -race -cover ./... || \
{ echo "--- Rerunning with -v for details ---"; \ { echo "--- Rerunning with -v for details ---"; \
go test -timeout 90s -race -v ./...; exit 1; } go test -timeout 90s -race -v ./...; exit 1; }
# Build stage. Nothing is wanted from either phase above; the copies # Vulnerability check, built only by script/vulncheck (make vulncheck).
# No stage depends on it, so the image build does not run it.
# golang:1.27.1, 2026-10-06
FROM golang@sha256:1e93e00a31255c07e9a34c4207f3006e1501730c5323697cee7dfb827fdae44c AS vulncheck
# govulncheck v1.8.0, 2026-10-06
RUN go install golang.org/x/vuln/cmd/govulncheck@709015412431dd2b5b28a53c06c70bc02d49074c
WORKDIR /src
COPY go.mod go.sum ./
RUN go mod download
COPY . .
RUN govulncheck ./...
# Build stage. Nothing is wanted from the lint or test phase; the copies
# are what make BuildKit build them first, so this stage cannot run # are what make BuildKit build them first, so this stage cannot run
# unless lint and test passed. The Debian Go image ships git, which the # unless lint and test passed. The Debian Go image ships git, which the
# version step below needs. # version step below needs.
# golang:1.23.12, 2026-03-14 # golang:1.27.1, 2026-10-06
FROM golang@sha256:60deed95d3888cc5e4d9ff8a10c54e5edc008c6ae3fba6187be6fb592e19e8c0 AS builder FROM golang@sha256:1e93e00a31255c07e9a34c4207f3006e1501730c5323697cee7dfb827fdae44c AS builder
COPY --from=lint /src/go.sum /dev/null COPY --from=lint /src/go.sum /dev/null
COPY --from=test /src/go.sum /dev/null COPY --from=test /src/go.sum /dev/null
# A tar-stream context keeps the sender's file owners, which git refuses. # A tar-stream context keeps the sender's file owners, which git refuses.
Makefile
+4 -1
View File
@@ -1,4 +1,4 @@
.PHONY: bootstrap setup test lint fmt fmt-check check docker hooks build generate fuzz .PHONY: bootstrap setup test lint fmt fmt-check check docker hooks build generate fuzz vulncheck
# Makefile targets are thin shims; the implementations live in script/ # Makefile targets are thin shims; the implementations live in script/
# per the scripts-to-rule-them-all pattern (see the Entrypoints section # per the scripts-to-rule-them-all pattern (see the Entrypoints section
@@ -39,3 +39,6 @@ generate:
fuzz: fuzz:
@script/fuzz @script/fuzz
vulncheck:
@script/vulncheck
README.md
+7 -2
View File
@@ -23,7 +23,7 @@ javascript library is planned.
# Getting Started # Getting Started
`mfer` builds from source with a Go 1.23+ toolchain. The generated protobuf code `mfer` builds from source with Go 1.27.1 or later. The generated protobuf code
is committed, so no `protoc` toolchain is required: is committed, so no `protoc` toolchain is required:
```sh ```sh
@@ -70,7 +70,7 @@ provide:
- `script/bootstrap` — install all dependencies, idempotently: Go and the - `script/bootstrap` — install all dependencies, idempotently: Go and the
modules of `go.mod`; node (the version `.nvmrc` names, through nvm when there modules of `go.mod`; node (the version `.nvmrc` names, through nvm when there
is no node on `PATH`) and yarn, plus the prettier version pinned in is no node on `PATH`) and yarn, plus the prettier version pinned in
`package.json`/`yarn.lock`; `gofumpt` v0.12.0 and `protoc-gen-go` v1.36.11, `package.json`/`yarn.lock`; `gofumpt` v0.12.0 and `protoc-gen-go` v1.36.12,
installed into `bin/` with `go install`, each pinned to a commit; and `protoc` installed into `bin/` with `go install`, each pinned to a commit; and `protoc`
33.4, unpacked into `bin/protoc` from its release archive once the archive 33.4, unpacked into `bin/protoc` from its release archive once the archive
matches the sha256 the script holds for this platform. Each of those three is matches the sha256 the script holds for this platform. Each of those three is
@@ -98,6 +98,11 @@ provide:
as ordinary tests as ordinary tests
- `script/lint` — run `golangci-lint` in Docker: builds only the `lint` stage of - `script/lint` — run `golangci-lint` in Docker: builds only the `lint` stage of
the `Dockerfile`, whose build runs the linter, uncached so it runs every time the `Dockerfile`, whose build runs the linter, uncached so it runs every time
- `script/vulncheck` (`make vulncheck`) — run `govulncheck` in Docker: builds
only the `vulncheck` stage of the `Dockerfile`, uncached, which reports known
vulnerabilities in the code `mfer` calls, from the Go vulnerability database.
`script/check` does not run it, so an advisory published later never turns the
gate red
- `script/fmt` — format all code and docs (writes): `script/gofumpt --write` and - `script/fmt` — format all code and docs (writes): `script/gofumpt --write` and
`script/prettier --write` `script/prettier --write`
- `script/gofumpt` — run `gofumpt` over every Go file in the repository in the - `script/gofumpt` — run `gofumpt` over every Go file in the repository in the
docs/FORMAT.md
+20 -5
View File
@@ -37,7 +37,7 @@ The outer message contains:
| `uuid` | 105 | bytes | Random v4 UUID; must match the inner message UUID | | `uuid` | 105 | bytes | Random v4 UUID; must match the inner message UUID |
| `innerMessage` | 199 | bytes | Zstd-compressed serialized `MFFile` message | | `innerMessage` | 199 | bytes | Zstd-compressed serialized `MFFile` message |
| `signature` | 201 | bytes (optional) | GPG signature (ASCII-armored or binary) | | `signature` | 201 | bytes (optional) | GPG signature (ASCII-armored or binary) |
| `signer` | 202 | bytes (optional) | Full GPG key ID of the signer | | `signer` | 202 | bytes (optional) | Fingerprint of the signing key |
| `signingPubKey` | 203 | bytes (optional) | Full GPG signing public key | | `signingPubKey` | 203 | bytes (optional) | Full GPG signing public key |
### SHA-256 Hash ### SHA-256 Hash
@@ -50,11 +50,14 @@ allows verifying data integrity before decompression.
The `innerMessage` field is compressed with The `innerMessage` field is compressed with
[Zstandard (zstd)](https://facebook.github.io/zstd/). Implementations must [Zstandard (zstd)](https://facebook.github.io/zstd/). Implementations must
enforce a decompression size limit to prevent decompression bombs. The reference enforce a decompression size limit to prevent decompression bombs. The reference
implementation limits decompressed size to 256 MB. It writes zstd frames with a implementation limits decompressed size to 256 MiB. It writes zstd frames with a
window of at most 8 MiB, the largest window the zstd format recommends decoders window of at most 8 MiB, the largest window the zstd format recommends decoders
support, and refuses frames that ask for a larger one. It also refuses an inner support, and refuses frames that ask for a larger one. It also refuses an inner
message whose file entries, hashes, timestamps and MIME types, counted at 176, message whose file entries, hashes, timestamps and MIME types, counted at 176,
112, 64 and 16 bytes each, add up to more than 8 times its size. 112, 64 and 16 bytes each, add up to more than 8 times its size. It refuses a
manifest file larger than 258 MiB without reading the rest of it: zstd's worst
case grows a 256 MiB inner message by 1/256 to 257 MiB, and the last MiB is room
for the signature, the signing key and the other outer fields.
## Inner Message (`MFFile`) ## Inner Message (`MFFile`)
@@ -106,9 +109,12 @@ All `path` values must satisfy these invariants:
- **No parent traversal**: no `..` path segments - **No parent traversal**: no `..` path segments
- **No empty segments**: no `//` sequences - **No empty segments**: no `//` sequences
- **No trailing slash**: paths refer to files, not directories - **No trailing slash**: paths refer to files, not directories
- **Listed once**: each path appears at most once in a manifest, compared byte
for byte, so `A.txt` and `a.txt` are two paths
Implementations must validate these invariants when reading and writing Implementations must validate these invariants when reading and writing
manifests. Paths that violate these rules must be rejected. manifests. Paths that violate these rules must be rejected, and a reader must
reject a manifest that lists a path more than once.
## Hash Format (`MFFileChecksum`) ## Hash Format (`MFFileChecksum`)
@@ -137,7 +143,16 @@ Where:
compressed data) compressed data)
Components are separated by hyphens. The signature is produced by GPG over this Components are separated by hyphens. The signature is produced by GPG over this
canonical string and stored in the `signature` field of the outer message. canonical string and stored in the `signature` field of the outer message. The
signing key's public key goes in `signingPubKey` and its fingerprint, in hex, in
`signer`.
A verifier accepts a signed manifest only if `signingPubKey` holds exactly one
primary key, `signature` is one good signature over the canonical string made by
that key (or one of its subkeys), and `signer` is that key's fingerprint. The
reference implementation refuses to load a manifest that fails these checks;
`check` and `fetch` given `--require-signature` then compare the required
fingerprint with `signer`.
## Deterministic Serialization ## Deterministic Serialization
go.mod
+14 -15
View File
@@ -1,29 +1,28 @@
module sneak.berlin/go/mfer module sneak.berlin/go/mfer
go 1.23 go 1.27.1
require ( require (
github.com/davecgh/go-spew v1.1.1 github.com/davecgh/go-spew v1.1.1
github.com/dustin/go-humanize v1.0.1 github.com/dustin/go-humanize v1.1.0
github.com/google/uuid v1.1.2 github.com/klauspost/compress v1.20.1
github.com/klauspost/compress v1.18.2
github.com/multiformats/go-multihash v0.2.3 github.com/multiformats/go-multihash v0.2.3
github.com/spf13/afero v1.8.0 github.com/spf13/afero v1.15.0
github.com/stretchr/testify v1.12.1 github.com/stretchr/testify v1.12.1
github.com/urfave/cli/v3 v3.14.0 github.com/urfave/cli/v3 v3.14.0
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 golang.org/x/term v0.46.0
google.golang.org/protobuf v1.28.1 google.golang.org/protobuf v1.36.12
) )
require ( require (
github.com/klauspost/cpuid/v2 v2.0.9 // indirect github.com/klauspost/cpuid/v2 v2.4.0 // indirect
github.com/minio/sha256-simd v1.0.0 // indirect github.com/minio/sha256-simd v1.0.1 // indirect
github.com/mr-tron/base58 v1.2.0 // indirect github.com/mr-tron/base58 v1.3.0 // indirect
github.com/multiformats/go-varint v0.0.6 // indirect github.com/multiformats/go-varint v0.1.0 // indirect
github.com/spaolacci/murmur3 v1.1.0 // indirect github.com/spaolacci/murmur3 v1.1.0 // indirect
go.yaml.in/yaml/v3 v3.0.5 // indirect go.yaml.in/yaml/v3 v3.0.5 // indirect
golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e // indirect golang.org/x/crypto v0.57.0 // indirect
golang.org/x/sys v0.1.0 // indirect golang.org/x/sys v0.48.0 // indirect
golang.org/x/text v0.3.6 // indirect golang.org/x/text v0.42.0 // indirect
lukechampine.com/blake3 v1.1.6 // indirect lukechampine.com/blake3 v1.4.1 // indirect
) )
go.sum
+28 -463
View File
@@ -1,475 +1,40 @@
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
cloud.google.com/go v0.44.3/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
cloud.google.com/go v0.53.0/go.mod h1:fp/UouUEsRkN6ryDKNW/Upv/JBKnv6WDthjR6+vze6M=
cloud.google.com/go v0.54.0/go.mod h1:1rq2OEkV3YMf6n/9ZvGWI3GWw0VoqH/1x2nd8Is/bPc=
cloud.google.com/go v0.56.0/go.mod h1:jr7tqZxxKOVYizybht9+26Z/gUq7tiRzu+ACVAMbKVk=
cloud.google.com/go v0.57.0/go.mod h1:oXiQ6Rzq3RAkkY7N6t3TcE6jE+CIBBbA36lwQ1JyzZs=
cloud.google.com/go v0.62.0/go.mod h1:jmCYTdRCQuc1PHIIJ/maLInMho30T/Y0M4hTdTShOYc=
cloud.google.com/go v0.65.0/go.mod h1:O5N8zS7uWy9vkA9vayVHs65eM1ubvY4h553ofrNHObY=
cloud.google.com/go v0.72.0/go.mod h1:M+5Vjvlc2wnp6tjzE102Dw08nGShTscUx2nZMufOKPI=
cloud.google.com/go v0.74.0/go.mod h1:VV1xSbzvo+9QJOxLDaJfTjx5e+MePCpCWwvftOeQmWk=
cloud.google.com/go v0.75.0/go.mod h1:VGuuCn7PG0dwsd5XPVm2Mm3wlh3EL55/79EKB6hlPTY=
cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
cloud.google.com/go/bigquery v1.3.0/go.mod h1:PjpwJnslEMmckchkHFfq+HTD2DmtT67aNFKH1/VBDHE=
cloud.google.com/go/bigquery v1.4.0/go.mod h1:S8dzgnTigyfTmLBfrtrhyYhwRxG72rYxvftPBK2Dvzc=
cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
cloud.google.com/go/bigquery v1.7.0/go.mod h1://okPTzCYNXSlb24MZs83e2Do+h+VXtc4gLoIoXIAPc=
cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
cloud.google.com/go/pubsub v1.1.0/go.mod h1:EwwdRX2sKPjnvnqCa270oGRyludottCI76h+R3AArQw=
cloud.google.com/go/pubsub v1.2.0/go.mod h1:jhfEVHT8odbXTkndysNHCcx0awwzvfOlguIAii9o8iA=
cloud.google.com/go/pubsub v1.3.1/go.mod h1:i+ucay31+CNRpDW4Lu78I4xXG+O1r/MAHgjpRVR+TSU=
cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0ZeosJ0Rtdos=
cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
cloud.google.com/go/storage v1.14.0/go.mod h1:GrKmX003DSIwi9o29oFT7YDnHYwZoctc3fOKtUw0Xmo=
dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI=
github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI=
github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU=
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
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golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
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google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
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google.golang.org/api v0.9.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
google.golang.org/api v0.13.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
google.golang.org/api v0.14.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
google.golang.org/api v0.15.0/go.mod h1:iLdEw5Ide6rF15KTC1Kkl0iskquN2gFfn9o9XIsbkAI=
google.golang.org/api v0.17.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
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google.golang.org/api v0.19.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
google.golang.org/api v0.20.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
google.golang.org/api v0.22.0/go.mod h1:BwFmGc8tA3vsd7r/7kR8DY7iEEGSU04BFxCo5jP/sfE=
google.golang.org/api v0.24.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0MncE=
google.golang.org/api v0.28.0/go.mod h1:lIXQywCXRcnZPGlsd8NbLnOjtAoL6em04bJ9+z0MncE=
google.golang.org/api v0.29.0/go.mod h1:Lcubydp8VUV7KeIHD9z2Bys/sm/vGKnG1UHuDBSrHWM=
google.golang.org/api v0.30.0/go.mod h1:QGmEvQ87FHZNiUVJkT14jQNYJ4ZJjdRF23ZXz5138Fc=
google.golang.org/api v0.35.0/go.mod h1:/XrVsuzM0rZmrsbjJutiuftIzeuTQcEeaYcSk/mQ1dg=
google.golang.org/api v0.36.0/go.mod h1:+z5ficQTmoYpPn8LCUNVpK5I7hwkpjbcgqA7I34qYtE=
google.golang.org/api v0.40.0/go.mod h1:fYKFpnQN0DsDSKRVRcQSDQNtqWPfM9i+zNPxepjRCQ8=
google.golang.org/appengine v1.1.0/go.mod h1:EbEs0AVv82hx2wNQdGPgUI5lhzA/G0D9YwlJXL52JkM=
google.golang.org/appengine v1.4.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.5.0/go.mod h1:xpcJRLb0r/rnEns0DIKYYv+WjYCduHsrkT7/EB5XEv4=
google.golang.org/appengine v1.6.1/go.mod h1:i06prIuMbXzDqacNJfV5OdTW448YApPu5ww/cMBSeb0=
google.golang.org/appengine v1.6.5/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
google.golang.org/appengine v1.6.6/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
google.golang.org/appengine v1.6.7/go.mod h1:8WjMMxjGQR8xUklV/ARdw2HLXBOI7O7uCIDZVag1xfc=
google.golang.org/genproto v0.0.0-20180817151627-c66870c02cf8/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
google.golang.org/genproto v0.0.0-20190307195333-5fe7a883aa19/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190418145605-e7d98fc518a7/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190425155659-357c62f0e4bb/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20191115194625-c23dd37a84c9/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20191216164720-4f79533eabd1/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20191230161307-f3c370f40bfb/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20200115191322-ca5a22157cba/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20200122232147-0452cf42e150/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
google.golang.org/genproto v0.0.0-20200204135345-fa8e72b47b90/go.mod h1:GmwEX6Z4W5gMy59cAlVYjN9JhxgbQH6Gn+gFDQe2lzA=
google.golang.org/genproto v0.0.0-20200212174721-66ed5ce911ce/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200224152610-e50cd9704f63/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200228133532-8c2c7df3a383/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200305110556-506484158171/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200312145019-da6875a35672/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200331122359-1ee6d9798940/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200430143042-b979b6f78d84/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200511104702-f5ebc3bea380/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
google.golang.org/genproto v0.0.0-20200515170657-fc4c6c6a6587/go.mod h1:YsZOwe1myG/8QRHRsmBRE1LrgQY60beZKjly0O1fX9U=
google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
google.golang.org/genproto v0.0.0-20200618031413-b414f8b61790/go.mod h1:jDfRM7FcilCzHH/e9qn6dsT145K34l5v+OpcnNgKAAA=
google.golang.org/genproto v0.0.0-20200729003335-053ba62fc06f/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20200804131852-c06518451d9c/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20200825200019-8632dd797987/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20200904004341-0bd0a958aa1d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20201109203340-2640f1f9cdfb/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20201201144952-b05cb90ed32e/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20201210142538-e3217bee35cc/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20201214200347-8c77b98c765d/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20210108203827-ffc7fda8c3d7/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/genproto v0.0.0-20210226172003-ab064af71705/go.mod h1:FWY/as6DDZQgahTzZj3fqbO1CbirC29ZNUFHwi0/+no=
google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
google.golang.org/grpc v1.26.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.27.1/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
google.golang.org/grpc v1.28.0/go.mod h1:rpkK4SK4GF4Ach/+MFLZUBavHOvF2JJB5uozKKal+60=
google.golang.org/grpc v1.29.1/go.mod h1:itym6AZVZYACWQqET3MqgPpjcuV5QH3BxFS3IjizoKk=
google.golang.org/grpc v1.30.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
google.golang.org/grpc v1.31.0/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
google.golang.org/grpc v1.31.1/go.mod h1:N36X2cJ7JwdamYAgDz+s+rVMFjt3numwzf/HckM8pak=
google.golang.org/grpc v1.33.2/go.mod h1:JMHMWHQWaTccqQQlmk3MJZS+GWXOdAesneDmEnv2fbc=
google.golang.org/grpc v1.34.0/go.mod h1:WotjhfgOW/POjDeRt8vscBtXq+2VjORFy659qA51WJ8=
google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGjtUeSXeh4=
google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
google.golang.org/protobuf v1.28.1 h1:d0NfwRgPtno5B1Wa6L2DAG+KivqkdutMf1UhdNx175w=
google.golang.org/protobuf v1.28.1/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
honnef.co/go/tools v0.0.1-2020.1.3/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
honnef.co/go/tools v0.0.1-2020.1.4/go.mod h1:X/FiERA/W4tHapMX5mGpAtMSVEeEUOyHaw9vFzvIQ3k=
lukechampine.com/blake3 v1.1.6 h1:H3cROdztr7RCfoaTpGZFQsrqvweFLrqS73j7L7cmR5c=
lukechampine.com/blake3 v1.1.6/go.mod h1:tkKEOtDkNtklkXtLNEOGNq5tcV90tJiA1vAA12R78LA=
rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
rsc.io/quote/v3 v3.1.0/go.mod h1:yEA65RcK8LyAZtP9Kv3t0HmxON59tX3rD+tICJqUlj0=
rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
internal/cli/check.go
+17 -17
View File
@@ -112,10 +112,17 @@ func (mfa *CLIApp) fetchManifestToTemp(
} }
tmpPath := tmpFile.Name() tmpPath := tmpFile.Name()
_, cpErr := io.Copy(tmpFile, rc)
// Copying stops one byte past mfa.maxManifestSize, which is enough to
// tell that the manifest is too large.
written, cpErr := io.Copy(tmpFile, io.LimitReader(rc, mfa.maxManifestSize+1))
_ = rc.Close() _ = rc.Close()
_ = tmpFile.Close() _ = tmpFile.Close()
if cpErr == nil && written > mfa.maxManifestSize {
cpErr = fmt.Errorf("%w of %d bytes", errManifestTooLarge, mfa.maxManifestSize)
}
if cpErr != nil { if cpErr != nil {
_ = mfa.Fs.Remove(tmpPath) _ = mfa.Fs.Remove(tmpPath)
@@ -126,10 +133,8 @@ func (mfa *CLIApp) fetchManifestToTemp(
} }
// verifyRequiredSigner enforces the --require-signature fingerprint // verifyRequiredSigner enforces the --require-signature fingerprint
// against the manifest's embedded signing key. // against the key that made the manifest's signature.
func verifyRequiredSigner( func verifyRequiredSigner(chk *mfer.Checker, requiredSigner string) error {
ctx context.Context, chk *mfer.Checker, requiredSigner string,
) error {
// Validate fingerprint format: must be exactly 40 hex characters // Validate fingerprint format: must be exactly 40 hex characters
if len(requiredSigner) != fingerprintHexLen { if len(requiredSigner) != fingerprintHexLen {
return fmt.Errorf("%w, got %d", errInvalidFingerprint, len(requiredSigner)) return fmt.Errorf("%w, got %d", errInvalidFingerprint, len(requiredSigner))
@@ -145,22 +150,17 @@ func verifyRequiredSigner(
errManifestNotSigned, requiredSigner) errManifestNotSigned, requiredSigner)
} }
// Extract fingerprint from the embedded public key (not from the // Loading the manifest checked that the signer is the fingerprint of
// signer field). This validates the key is importable and gets its // the key that made the signature.
// actual fingerprint. signer := string(chk.Signer())
embeddedFP, err := chk.ExtractEmbeddedSigningKeyFP(ctx)
if err != nil {
return fmt.Errorf(
"failed to extract fingerprint from embedded signing key: %w", err)
}
// Compare fingerprints - must be exact match (case-insensitive) // Compare fingerprints - must be exact match (case-insensitive)
if !strings.EqualFold(embeddedFP, requiredSigner) { if !strings.EqualFold(signer, requiredSigner) {
return fmt.Errorf("embedded signing key fingerprint %s %w %s", return fmt.Errorf("embedded signing key fingerprint %s %w %s",
embeddedFP, errSignerMismatch, requiredSigner) signer, errSignerMismatch, requiredSigner)
} }
log.Infof("manifest signature verified (signer: %s)", embeddedFP) log.Infof("manifest signature verified (signer: %s)", signer)
return nil return nil
} }
@@ -330,7 +330,7 @@ func (mfa *CLIApp) checkManifestOperation(
// Check signature requirement // Check signature requirement
requiredSigner := cmd.String(flagRequireSignature) requiredSigner := cmd.String(flagRequireSignature)
if requiredSigner != "" { if requiredSigner != "" {
err = verifyRequiredSigner(ctx, chk, requiredSigner) err = verifyRequiredSigner(chk, requiredSigner)
if err != nil { if err != nil {
return err return err
} }
internal/cli/entry.go
+10 -8
View File
@@ -5,6 +5,7 @@ import (
"os" "os"
"github.com/spf13/afero" "github.com/spf13/afero"
"sneak.berlin/go/mfer/mfer"
) )
// NoColor disables colored output when set. Automatically true if the // NoColor disables colored output when set. Automatically true if the
@@ -56,14 +57,15 @@ func Run(appname, version, gitrev string) int {
// RunWithOptions creates and runs the CLI application with the given options. // RunWithOptions creates and runs the CLI application with the given options.
func RunWithOptions(opts *RunOptions) int { func RunWithOptions(opts *RunOptions) int {
m := &CLIApp{ m := &CLIApp{
appname: opts.Appname, appname: opts.Appname,
version: opts.Version, version: opts.Version,
gitrev: opts.Gitrev, gitrev: opts.Gitrev,
exitCode: 0, exitCode: 0,
Stdin: opts.Stdin, maxManifestSize: mfer.MaxManifestSize,
Stdout: opts.Stdout, Stdin: opts.Stdin,
Stderr: opts.Stderr, Stdout: opts.Stdout,
Fs: opts.Fs, Stderr: opts.Stderr,
Fs: opts.Fs,
} }
m.run(opts.Args) m.run(opts.Args)
internal/cli/entry_test.go
+99 -1
View File
@@ -354,6 +354,77 @@ func TestGenerateCommand(t *testing.T) {
assert.True(t, exists) assert.True(t, exists)
} }
// TestGenerateRefusesTwoFilesAtOnePath runs gen on arguments whose files
// would share a path in the manifest: two directories that each hold a.txt,
// and one directory given twice. gen must fail while it lists the files,
// before it hashes any, naming the path, and write no manifest.
func TestGenerateRefusesTwoFilesAtOnePath(t *testing.T) {
t.Parallel()
for _, tc := range []struct {
name string
first, second string
}{
{"two directories", testDir, "/other"},
{"one directory twice", testDir, testDir},
} {
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
fs := afero.NewMemMapFs()
require.NoError(t, fs.MkdirAll(testDir, 0o755))
require.NoError(t, fs.MkdirAll("/other", 0o755))
writeTestFile(t, fs, "/testdir/a.txt", "first")
writeTestFile(t, fs, "/other/a.txt", "second")
opts := testOpts([]string{
testApp, cmdGenerate, "-q", "-o", testOutput, tc.first, tc.second,
}, fs)
assert.Equal(t, 1, runCLI(opts))
assert.Contains(t, testStderr(t, opts),
`generate: failed to enumerate paths: duplicate path "a.txt": `+
tc.first+"/a.txt and "+tc.second+"/a.txt")
exists, err := afero.Exists(fs, testOutput)
require.NoError(t, err)
assert.False(t, exists)
})
}
}
// TestGenerateSeededManifestBytes pins the exact bytes `gen --seed` writes
// for a fixed tree, so that a Go or dependency update that changes what
// mfer writes fails here. testdata/seeded.mf was written by an mfer built
// before such an update. The tree has enough files that zstd compresses
// the manifest instead of storing it as it is.
func TestGenerateSeededManifestBytes(t *testing.T) {
t.Parallel()
fs := afero.NewMemMapFs()
start := time.Date(2025, 6, 1, 0, 0, 0, 0, time.UTC)
for i := range 200 {
path := fmt.Sprintf("/testdir/d%d/f%03d.txt", i%10, i)
mtime := start.Add(time.Duration(i) * time.Second)
require.NoError(t, fs.MkdirAll(filepath.Dir(path), 0o755))
writeTestFile(t, fs, path, fmt.Sprintf("file %d\n", i))
require.NoError(t, fs.Chtimes(path, mtime, mtime))
}
opts := testOpts([]string{
testApp, cmdGenerate, "-q", "--seed", "mfer", "-o", testOutput, testDir,
}, fs)
require.Equal(t, 0, runCLI(opts), "stderr: %s", testStderr(t, opts))
got, err := afero.ReadFile(fs, testOutput)
require.NoError(t, err)
want, err := os.ReadFile("testdata/seeded.mf")
require.NoError(t, err)
assert.Equal(t, want, got)
}
func TestGenerateAndCheckCommand(t *testing.T) { func TestGenerateAndCheckCommand(t *testing.T) {
t.Parallel() t.Parallel()
@@ -410,7 +481,7 @@ func TestGenerateRecordsModeOnlyWhenAsked(t *testing.T) {
listed := map[string]string{} listed := map[string]string{}
out := strings.TrimSuffix(testStdout(t, opts), "\n") out := strings.TrimSuffix(testStdout(t, opts), "\n")
for _, line := range strings.Split(out, "\n") { for line := range strings.SplitSeq(out, "\n") {
fields := strings.Split(line, "\t") // mode, size, mtime, path fields := strings.Split(line, "\t") // mode, size, mtime, path
require.Len(t, fields, 4, line) require.Len(t, fields, 4, line)
listed[fields[3]] = fields[0] listed[fields[3]] = fields[0]
@@ -580,6 +651,33 @@ func runCheckAfterRewrite(t *testing.T, rewritten, msg string) {
assert.Equal(t, 1, exitCode, msg) assert.Equal(t, 1, exitCode, msg)
} }
// TestCheckRequireSignatureRefusesOtherSigningKey runs check
// --require-signature on a manifest signed by another key whose embedded
// public key block also holds the required key. check must refuse it. It
// needs gpg and is skipped without it, as the other signing tests are.
//
//nolint:paralleltest // signedManifest calls t.Setenv, which bars t.Parallel
func TestCheckRequireSignatureRefusesOtherSigningKey(t *testing.T) {
content := []byte("signed file")
manifest, required := manifestSignedByAnotherKey(t,
map[string][]byte{testFileTxt: content})
fs := afero.NewMemMapFs()
require.NoError(t, fs.MkdirAll(testDir, 0o755))
require.NoError(t, afero.WriteFile(fs,
filepath.Join(testDir, testFileTxt), content, 0o644))
require.NoError(t, afero.WriteFile(fs, testManifest, manifest, 0o644))
opts := testOpts([]string{
testApp, cmdCheck, "-q", testFlagBase, testDir,
"--" + flagRequireSignature, required, testManifest,
}, fs)
assert.Equal(t, 1, runCLI(opts))
assert.Contains(t, testStderr(t, opts),
"failed to load manifest: signature verification failed: "+
"embedded public key block must hold exactly one key, found 2")
}
func TestCheckCommandWithCorruptedFile(t *testing.T) { func TestCheckCommandWithCorruptedFile(t *testing.T) {
t.Parallel() t.Parallel()
internal/cli/errmsg_test.go
+39 -13
View File
@@ -9,12 +9,14 @@ import (
"os" "os"
"os/exec" "os/exec"
"path/filepath" "path/filepath"
"slices"
"testing" "testing"
"github.com/spf13/afero" "github.com/spf13/afero"
"github.com/stretchr/testify/assert" "github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require" "github.com/stretchr/testify/require"
urfcli "github.com/urfave/cli/v3" urfcli "github.com/urfave/cli/v3"
"google.golang.org/protobuf/proto"
"sneak.berlin/go/mfer/mfer" "sneak.berlin/go/mfer/mfer"
) )
@@ -86,8 +88,7 @@ func TestVerifyRequiredSignerMessages(t *testing.T) {
t.Run("invalid fingerprint length", func(t *testing.T) { t.Run("invalid fingerprint length", func(t *testing.T) {
t.Parallel() t.Parallel()
err := verifyRequiredSigner(context.Background(), err := verifyRequiredSigner(unsignedChecker(t), "12345678")
unsignedChecker(t), "12345678")
require.ErrorIs(t, err, errInvalidFingerprint) require.ErrorIs(t, err, errInvalidFingerprint)
assert.EqualError(t, err, assert.EqualError(t, err,
"invalid fingerprint: must be exactly 40 hex characters, got 8") "invalid fingerprint: must be exactly 40 hex characters, got 8")
@@ -96,8 +97,7 @@ func TestVerifyRequiredSignerMessages(t *testing.T) {
t.Run("manifest not signed", func(t *testing.T) { t.Run("manifest not signed", func(t *testing.T) {
t.Parallel() t.Parallel()
err := verifyRequiredSigner(context.Background(), err := verifyRequiredSigner(unsignedChecker(t), msgFpA)
unsignedChecker(t), msgFpA)
require.ErrorIs(t, err, errManifestNotSigned) require.ErrorIs(t, err, errManifestNotSigned)
assert.EqualError(t, err, assert.EqualError(t, err,
"manifest is not signed, but signature from "+msgFpA+" is required") "manifest is not signed, but signature from "+msgFpA+" is required")
@@ -105,23 +105,21 @@ func TestVerifyRequiredSignerMessages(t *testing.T) {
} }
// TestSignerMismatchMessage drives verifyRequiredSigner against a real signed // TestSignerMismatchMessage drives verifyRequiredSigner against a real signed
// manifest. The embedded fingerprint is whatever the generated key produced, // manifest. The signing key's fingerprint is whatever the generated key
// so it is read back from the checker and substituted into the expected // produced, so it is read back from the checker and substituted into the
// string; the required signer is a fixed value that cannot match it. Requires // expected string; the required signer is a fixed value that cannot match
// gpg and is skipped where it is absent, as the other signing tests are. // it. Requires gpg and is skipped where it is absent, as the other signing
// tests are.
// //
//nolint:paralleltest // signedManifest calls t.Setenv, which bars t.Parallel //nolint:paralleltest // signedManifest calls t.Setenv, which bars t.Parallel
func TestSignerMismatchMessage(t *testing.T) { func TestSignerMismatchMessage(t *testing.T) {
chk := signedChecker(t, chk := signedChecker(t,
signedManifest(t, map[string][]byte{"f.txt": []byte("signed file")})) signedManifest(t, map[string][]byte{"f.txt": []byte("signed file")}))
embeddedFP, err := chk.ExtractEmbeddedSigningKeyFP(context.Background()) err := verifyRequiredSigner(chk, msgFpB)
require.NoError(t, err)
err = verifyRequiredSigner(context.Background(), chk, msgFpB)
require.ErrorIs(t, err, errSignerMismatch) require.ErrorIs(t, err, errSignerMismatch)
assert.EqualError(t, err, assert.EqualError(t, err,
"embedded signing key fingerprint "+embeddedFP+ "embedded signing key fingerprint "+string(chk.Signer())+
" does not match required "+msgFpB) " does not match required "+msgFpB)
} }
@@ -191,6 +189,34 @@ func signedChecker(t *testing.T, manifest []byte) *mfer.Checker {
return chk return chk
} }
// manifestSignedByAnotherKey returns a manifest of files and the
// fingerprint of a throwaway key, the required key, that did not sign it.
// The manifest is signed by a second throwaway key; its embedded public key
// block holds the required key followed by the second key, and its signer
// field names the required key.
func manifestSignedByAnotherKey(
t *testing.T, files map[string][]byte,
) ([]byte, string) {
t.Helper()
required := new(mfer.MFFileOuter)
require.NoError(t, proto.Unmarshal(
signedManifest(t, files)[len(mfer.MAGIC):], required))
outer := new(mfer.MFFileOuter)
require.NoError(t, proto.Unmarshal(
signedManifest(t, files)[len(mfer.MAGIC):], outer))
outer.SigningPubKey = slices.Concat(
required.GetSigningPubKey(), outer.GetSigningPubKey())
outer.Signer = required.GetSigner()
data, err := proto.Marshal(outer)
require.NoError(t, err)
return append([]byte(mfer.MAGIC), data...), string(required.GetSigner())
}
func TestPathDoesNotExistMessage(t *testing.T) { func TestPathDoesNotExistMessage(t *testing.T) {
t.Parallel() t.Parallel()
internal/cli/fetch.go
+20 -13
View File
@@ -361,7 +361,7 @@ func (mfa *CLIApp) fetchManifestOperation(
firstDelay: firstRetryDelay, firstDelay: firstRetryDelay,
} }
manifestData, files, err := fetchManifest(ctx, cmd, client, manifestURL) manifestData, files, err := mfa.fetchManifest(ctx, cmd, client, manifestURL)
if err != nil { if err != nil {
return err return err
} }
@@ -426,20 +426,22 @@ func (mfa *CLIApp) fetchManifestOperation(
// that lists a file where fetch writes another or a mode outside 0777. It // that lists a file where fetch writes another or a mode outside 0777. It
// returns the manifest as downloaded, to be saved once the files are in // returns the manifest as downloaded, to be saved once the files are in
// place, and the files it lists. // place, and the files it lists.
func fetchManifest( func (mfa *CLIApp) fetchManifest(
ctx context.Context, cmd *cli.Command, client retryingClient, manifestURL string, ctx context.Context, cmd *cli.Command, client retryingClient, manifestURL string,
) ([]byte, []*mfer.MFFilePath, error) { ) ([]byte, []*mfer.MFFilePath, error) {
log.Infof("fetching manifest from %s", manifestURL) log.Infof("fetching manifest from %s", manifestURL)
// Read the whole manifest before parsing it, so that a connection // Read the whole manifest before parsing it, so that a connection
// lost partway through is retried rather than reported as a bad // lost partway through is retried rather than reported as a bad
// manifest. // manifest. Reading stops one byte past mfa.maxManifestSize, which is
// enough to tell that the manifest is too large.
var manifestData []byte var manifestData []byte
err := client.get(ctx, manifestURL, func(resp *http.Response) error { err := client.get(ctx, manifestURL, func(resp *http.Response) error {
var readErr error var readErr error
manifestData, readErr = io.ReadAll(resp.Body) manifestData, readErr = io.ReadAll(
io.LimitReader(resp.Body, mfa.maxManifestSize+1))
return readErr return readErr
}) })
@@ -447,6 +449,11 @@ func fetchManifest(
return nil, nil, fmt.Errorf("failed to fetch manifest: %w", err) return nil, nil, fmt.Errorf("failed to fetch manifest: %w", err)
} }
if int64(len(manifestData)) > mfa.maxManifestSize {
return nil, nil, fmt.Errorf("failed to fetch manifest: %w of %d bytes",
errManifestTooLarge, mfa.maxManifestSize)
}
// Parse manifest // Parse manifest
//nolint:contextcheck // mfer loads a manifest without a context //nolint:contextcheck // mfer loads a manifest without a context
manifest, err := mfer.NewManifestFromReader(bytes.NewReader(manifestData)) manifest, err := mfer.NewManifestFromReader(bytes.NewReader(manifestData))
@@ -456,7 +463,8 @@ func fetchManifest(
requiredSigner := cmd.String(flagRequireSignature) requiredSigner := cmd.String(flagRequireSignature)
if requiredSigner != "" { if requiredSigner != "" {
err = verifyFetchedSigner(ctx, manifestData, requiredSigner) //nolint:contextcheck // mfer loads a manifest without a context
err = verifyFetchedSigner(manifestData, requiredSigner)
if err != nil { if err != nil {
return nil, nil, err return nil, nil, err
} }
@@ -538,9 +546,7 @@ func checkNoNameClash(files []*mfer.MFFilePath) error {
// exactly as check does. verifyRequiredSigner takes a Checker, which loads // exactly as check does. verifyRequiredSigner takes a Checker, which loads
// its manifest from a file, so the manifest is handed to it as a file in // its manifest from a file, so the manifest is handed to it as a file in
// memory. // memory.
func verifyFetchedSigner( func verifyFetchedSigner(manifestData []byte, requiredSigner string) error {
ctx context.Context, manifestData []byte, requiredSigner string,
) error {
memFs := afero.NewMemMapFs() memFs := afero.NewMemMapFs()
manifestPath := "/" + defaultManifestName manifestPath := "/" + defaultManifestName
@@ -549,7 +555,6 @@ func verifyFetchedSigner(
return err return err
} }
//nolint:contextcheck // mfer loads a manifest without a context
chk, err := mfer.NewChecker(&mfer.CheckerOptions{ chk, err := mfer.NewChecker(&mfer.CheckerOptions{
ManifestPath: manifestPath, ManifestPath: manifestPath,
BasePath: "/", BasePath: "/",
@@ -559,7 +564,7 @@ func verifyFetchedSigner(
return fmt.Errorf("failed to load manifest: %w", err) return fmt.Errorf("failed to load manifest: %w", err)
} }
return verifyRequiredSigner(ctx, chk, requiredSigner) return verifyRequiredSigner(chk, requiredSigner)
} }
// saveManifest writes the fetched manifest into dest under the default // saveManifest writes the fetched manifest into dest under the default
@@ -639,7 +644,7 @@ func sanitizePath(p string) (string, error) {
func checkNoSymlinks(dest, p string) error { func checkNoSymlinks(dest, p string) error {
current := dest current := dest
for _, part := range strings.Split(p, string(filepath.Separator)) { for part := range strings.SplitSeq(p, string(filepath.Separator)) {
current = filepath.Join(current, part) current = filepath.Join(current, part)
info, err := os.Lstat(current) info, err := os.Lstat(current)
@@ -910,8 +915,10 @@ func saveResponse(
progress: progress, progress: progress,
} }
// Copy content while hashing and reporting progress // Copy content while hashing and reporting progress. One byte past
written, copyErr := io.Copy(pw, resp.Body) // the listed size is enough for finishDownload to report a size
// mismatch.
written, copyErr := io.Copy(pw, io.LimitReader(resp.Body, expectedSize+1))
// Close file before checking errors (to flush writes) // Close file before checking errors (to flush writes)
closeErr := out.Close() closeErr := out.Close()
internal/cli/fetch_test.go
+87 -13
View File
@@ -19,13 +19,14 @@ import (
"sync/atomic" "sync/atomic"
"testing" "testing"
"time" "time"
"uuid"
"github.com/google/uuid"
"github.com/klauspost/compress/zstd" "github.com/klauspost/compress/zstd"
"github.com/multiformats/go-multihash" "github.com/multiformats/go-multihash"
"github.com/spf13/afero" "github.com/spf13/afero"
"github.com/stretchr/testify/assert" "github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require" "github.com/stretchr/testify/require"
urfcli "github.com/urfave/cli/v3"
"google.golang.org/protobuf/proto" "google.golang.org/protobuf/proto"
"sneak.berlin/go/mfer/mfer" "sneak.berlin/go/mfer/mfer"
) )
@@ -186,12 +187,7 @@ func chdirTemp(t *testing.T) string {
t.Helper() t.Helper()
destDir := t.TempDir() destDir := t.TempDir()
t.Chdir(destDir)
origDir, err := os.Getwd()
require.NoError(t, err)
require.NoError(t, os.Chdir(destDir))
t.Cleanup(func() { _ = os.Chdir(origDir) })
return destDir return destDir
} }
@@ -446,6 +442,75 @@ func TestFetchSizeMismatch(t *testing.T) {
"temp file should be cleaned up on size mismatch") "temp file should be cleaned up on size mismatch")
} }
// zeros is an io.Reader of zero bytes without end.
type zeros struct{}
func (zeros) Read(p []byte) (int, error) {
clear(p)
return len(p), nil
}
// TestFetchStopsReadingFilePastListedSize serves a body that never ends
// for a file listed at 16 bytes. fetch must stop reading one byte past
// the listed size, report the size mismatch and remove its temp file.
//
//nolint:paralleltest // changes the process-global working directory
func TestFetchStopsReadingFilePastListedSize(t *testing.T) {
server := httptest.NewServer(
http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
_, _ = io.Copy(w, zeros{})
}))
defer server.Close()
chdirTemp(t)
err := downloadFile(context.Background(), testClient(),
server.URL+"/"+testFileTxt, ".", testFileTxt,
&mfer.MFFilePath{Path: testFileTxt, Size: 16}, nil)
require.ErrorIs(t, err, errSizeMismatch)
require.EqualError(t, err, "size mismatch: expected 16 bytes, got 17")
assert.NoFileExists(t, tempPathFor(testFileTxt))
}
// TestManifestDownloadStopsAtLimit serves a manifest that never ends to
// fetch and to check, with the most they download of a manifest lowered
// to 64 KiB. Each must stop reading at that limit, fail with an error
// naming it and leave no temp file.
func TestManifestDownloadStopsAtLimit(t *testing.T) {
server := httptest.NewServer(
http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
_, _ = io.Copy(w, zeros{})
}))
defer server.Close()
tmpDir := t.TempDir()
t.Setenv("TMPDIR", tmpDir)
mfa := &CLIApp{Fs: afero.NewOsFs(), maxManifestSize: 64 << 10}
fetch := mfa.fetchCommand()
fetch.Action = mfa.fetchManifestOperation
check := mfa.checkCommand()
check.Action = mfa.checkManifestOperation
for _, cmd := range []*urfcli.Command{fetch, check} {
// Both operations log to the process-global logger.
err := runLocked(func() error {
return cmd.Run(context.Background(),
[]string{cmd.Name, server.URL + "/index.mf"})
})
require.ErrorIs(t, err, errManifestTooLarge, cmd.Name)
require.ErrorContains(t, err,
"maximum allowed size of 65536 bytes", cmd.Name)
}
leftover, err := os.ReadDir(tmpDir)
require.NoError(t, err)
assert.Empty(t, leftover)
}
//nolint:paralleltest // changes the process-global working directory //nolint:paralleltest // changes the process-global working directory
func TestFetchProgress(t *testing.T) { func TestFetchProgress(t *testing.T) {
// Create source filesystem with a larger test file // Create source filesystem with a larger test file
@@ -1122,8 +1187,10 @@ func TestFetchIntoDest(t *testing.T) {
// TestFetchRequireSignature runs fetch with --require-signature. A // TestFetchRequireSignature runs fetch with --require-signature. A
// manifest that is unsigned, or signed by another key, must stop fetch // manifest that is unsigned, or signed by another key, must stop fetch
// with check's message before it downloads or writes anything; the // with check's message before it downloads or writes anything; the
// required key lets it through. The signed cases need gpg and are skipped // required key lets it through. A manifest signed by another key whose
// without it, as the other signing tests are. // embedded public key block also holds the required key must stop fetch
// too. The signed cases need gpg and are skipped without it, as the other
// signing tests are.
// //
//nolint:paralleltest // signedManifest calls t.Setenv, which bars t.Parallel //nolint:paralleltest // signedManifest calls t.Setenv, which bars t.Parallel
func TestFetchRequireSignature(t *testing.T) { func TestFetchRequireSignature(t *testing.T) {
@@ -1138,9 +1205,7 @@ func TestFetchRequireSignature(t *testing.T) {
t.Run("signed", func(t *testing.T) { t.Run("signed", func(t *testing.T) {
manifest := signedManifest(t, files) manifest := signedManifest(t, files)
signer, err := signedChecker(t, manifest). signer := string(signedChecker(t, manifest).Signer())
ExtractEmbeddedSigningKeyFP(context.Background())
require.NoError(t, err)
assertFetchRefused(t, manifest, files, assertFetchRefused(t, manifest, files,
"embedded signing key fingerprint "+signer+" does not match required "+msgFpB, "embedded signing key fingerprint "+signer+" does not match required "+msgFpB,
@@ -1158,6 +1223,15 @@ func TestFetchRequireSignature(t *testing.T) {
require.Equal(t, 0, runCLI(opts), testStderr(t, opts)) require.Equal(t, 0, runCLI(opts), testStderr(t, opts))
assert.Equal(t, files[testFileTxt], filesUnder(t, dest)[testFileTxt]) assert.Equal(t, files[testFileTxt], filesUnder(t, dest)[testFileTxt])
}) })
t.Run("signed by another key embedded after the required one", func(t *testing.T) {
manifest, required := manifestSignedByAnotherKey(t, files)
assertFetchRefused(t, manifest, files,
"failed to parse manifest: signature verification failed: "+
"embedded public key block must hold exactly one key, found 2",
"--"+flagRequireSignature, required)
})
} }
// TestFetchRefusesListedManifestName fetches manifests that list, at the // TestFetchRefusesListedManifestName fetches manifests that list, at the
@@ -1456,7 +1530,7 @@ func manifestWithMode(t *testing.T, path string, content []byte, mode uint32) []
hash, err := multihash.Encode(digest[:], multihash.SHA2_256) hash, err := multihash.Encode(digest[:], multihash.SHA2_256)
require.NoError(t, err) require.NoError(t, err)
id := uuid.New() id := uuid.NewV4()
inner, err := proto.Marshal(&mfer.MFFile{ inner, err := proto.Marshal(&mfer.MFFile{
Version: mfer.MFFile_VERSION_ONE, Version: mfer.MFFile_VERSION_ONE,
internal/cli/manifest_loader.go
+4
View File
@@ -23,6 +23,10 @@ const manifestFetchTimeout = 30 * time.Second
// its message. // its message.
var errHTTPStatus = errors.New("HTTP") var errHTTPStatus = errors.New("HTTP")
// errManifestTooLarge indicates a manifest download that passed
// CLIApp.maxManifestSize.
var errManifestTooLarge = errors.New("manifest exceeds maximum allowed size")
// isHTTPURL returns true if the string starts with http:// or https://. // isHTTPURL returns true if the string starts with http:// or https://.
func isHTTPURL(s string) bool { func isHTTPURL(s string) bool {
return strings.HasPrefix(s, "http://") || strings.HasPrefix(s, "https://") return strings.HasPrefix(s, "http://") || strings.HasPrefix(s, "https://")
internal/cli/mfer.go
+4
View File
@@ -59,6 +59,10 @@ type CLIApp struct {
exitCode int exitCode int
app *cli.Command app *cli.Command
// maxManifestSize is the most of a manifest that fetch, and check
// given a URL, download: mfer.MaxManifestSize, which tests lower.
maxManifestSize int64
Stdin io.Reader // Standard input stream Stdin io.Reader // Standard input stream
Stdout io.Writer // Standard output stream for normal output Stdout io.Writer // Standard output stream for normal output
Stderr io.Writer // Standard error stream for diagnostics Stderr io.Writer // Standard error stream for diagnostics
internal/cli/testdata/seeded.mf
Vendored
BIN
View File
Binary file not shown.
mfer/builder.go
+26 -13
View File
@@ -38,6 +38,7 @@ var (
errNegativeSize = errors.New("size cannot be negative") errNegativeSize = errors.New("size cannot be negative")
errHashNotMultihash = errors.New("hash is not a valid multihash") errHashNotMultihash = errors.New("hash is not a valid multihash")
errHashTooShort = errors.New("hash digest is too short") errHashTooShort = errors.New("hash digest is too short")
errDuplicatePath = errors.New("duplicate path")
) )
// ValidatePath checks that a file path conforms to manifest path invariants: // ValidatePath checks that a file path conforms to manifest path invariants:
@@ -64,7 +65,7 @@ func ValidatePath(p string) error {
return fmt.Errorf("path %q %w", p, errPathAbsolute) return fmt.Errorf("path %q %w", p, errPathAbsolute)
} }
for _, seg := range strings.Split(p, "/") { for seg := range strings.SplitSeq(p, "/") {
if seg == "" { if seg == "" {
return fmt.Errorf("path %q %w", p, errPathEmptySegment) return fmt.Errorf("path %q %w", p, errPathEmptySegment)
} }
@@ -115,6 +116,7 @@ type FileHashProgress struct {
type Builder struct { type Builder struct {
mu sync.Mutex mu sync.Mutex
files []*MFFilePath files []*MFFilePath
paths map[string]bool // the path of each entry in files
createdAt time.Time createdAt time.Time
includeTimestamps bool includeTimestamps bool
signingOptions *SigningOptions signingOptions *SigningOptions
@@ -125,6 +127,7 @@ type Builder struct {
func NewBuilder() *Builder { func NewBuilder() *Builder {
return &Builder{ return &Builder{
files: make([]*MFFilePath, 0), files: make([]*MFFilePath, 0),
paths: make(map[string]bool),
createdAt: time.Now(), createdAt: time.Now(),
} }
} }
@@ -138,6 +141,7 @@ func (b *Builder) SetSeed(seed string) {
} }
// AddFile reads file content from reader, computes hashes, and adds to manifest. // AddFile reads file content from reader, computes hashes, and adds to manifest.
// A path already added is refused once the file is read.
// Only mode's permission bits (mode.Perm()) are recorded; 0 records none. // Only mode's permission bits (mode.Perm()) are recorded; 0 records none.
// Progress updates are sent to the progress channel (if non-nil) without blocking. // Progress updates are sent to the progress channel (if non-nil) without blocking.
// Returns the number of bytes read. // Returns the number of bytes read.
@@ -204,11 +208,7 @@ func (b *Builder) AddFile(
Mode: uint32(mode.Perm()), Mode: uint32(mode.Perm()),
} }
b.mu.Lock() return totalRead, b.addEntry(entry)
b.files = append(b.files, entry)
b.mu.Unlock()
return totalRead, nil
} }
// sendFileHashProgress sends a progress update without blocking. // sendFileHashProgress sends a progress update without blocking.
@@ -234,8 +234,9 @@ func (b *Builder) FileCount() int {
// AddFileWithHash adds a file entry with a pre-computed hash. // AddFileWithHash adds a file entry with a pre-computed hash.
// This is useful when the hash is already known (e.g., from an existing manifest). // This is useful when the hash is already known (e.g., from an existing manifest).
// Only mode's permission bits (mode.Perm()) are recorded; 0 records none. // Only mode's permission bits (mode.Perm()) are recorded; 0 records none.
// Returns an error if path is invalid, size is negative, or hash is not a // Returns an error if path is invalid or already added, size is negative,
// multihash with a digest of at least 32 bytes, as long as SHA-256's. // or hash is not a multihash with a digest of at least 32 bytes, as long
// as SHA-256's.
func (b *Builder) AddFileWithHash( func (b *Builder) AddFileWithHash(
path RelFilePath, path RelFilePath,
size FileSize, size FileSize,
@@ -277,11 +278,7 @@ func (b *Builder) AddFileWithHash(
Mode: uint32(mode.Perm()), Mode: uint32(mode.Perm()),
} }
b.mu.Lock() return b.addEntry(entry)
b.files = append(b.files, entry)
b.mu.Unlock()
return nil
} }
// SetIncludeTimestamps controls whether the manifest includes a createdAt timestamp. // SetIncludeTimestamps controls whether the manifest includes a createdAt timestamp.
@@ -349,3 +346,19 @@ func (b *Builder) Build(ctx context.Context, w io.Writer) error {
return nil return nil
} }
// addEntry adds entry to the manifest unless an entry with its path is
// already there.
func (b *Builder) addEntry(entry *MFFilePath) error {
b.mu.Lock()
defer b.mu.Unlock()
if b.paths[entry.GetPath()] {
return fmt.Errorf("%w %q", errDuplicatePath, entry.GetPath())
}
b.paths[entry.GetPath()] = true
b.files = append(b.files, entry)
return nil
}
mfer/builder_test.go
+26
View File
@@ -125,6 +125,32 @@ func TestBuilderAddFileWithHashRejectsBadHashes(t *testing.T) {
} }
} }
// TestBuilderRefusesPathAlreadyAdded adds a path, then adds it again with
// AddFile and with AddFileWithHash. Each must refuse it, naming it, and
// keep the one entry already added.
func TestBuilderRefusesPathAlreadyAdded(t *testing.T) {
t.Parallel()
hash, err := multihash.Encode(make([]byte, sha256.Size), multihash.SHA2_256)
require.NoError(t, err)
b := NewBuilder()
require.NoError(t, b.AddFileWithHash("dir/a.txt", 4, ModTime{}, 0, hash))
content := []byte("data")
_, err = b.AddFile(
"dir/a.txt", FileSize(len(content)), ModTime{}, 0, bytes.NewReader(content), nil,
)
require.ErrorIs(t, err, errDuplicatePath)
require.EqualError(t, err, `duplicate path "dir/a.txt"`)
err = b.AddFileWithHash("dir/a.txt", 4, ModTime{}, 0, hash)
require.ErrorIs(t, err, errDuplicatePath)
require.EqualError(t, err, `duplicate path "dir/a.txt"`)
assert.Equal(t, 1, b.FileCount())
}
func TestBuilderBuild(t *testing.T) { func TestBuilderBuild(t *testing.T) {
t.Parallel() t.Parallel()
mfer/checker.go
+7 -13
View File
@@ -15,7 +15,6 @@ import (
) )
var ( var (
errNoSigningPubKey = errors.New("manifest has no signing public key")
errManifestPathEmpty = errors.New("manifest path cannot be empty") errManifestPathEmpty = errors.New("manifest path cannot be empty")
errBasePathEmpty = errors.New("base path cannot be empty") errBasePathEmpty = errors.New("base path cannot be empty")
) )
@@ -173,8 +172,14 @@ func (c *Checker) IsSigned() bool {
return len(c.signature) > 0 return len(c.signature) > 0
} }
// Signer returns the signer fingerprint if the manifest is signed, nil otherwise. // Signer returns the fingerprint of the key that made the manifest's
// signature, which loading the manifest checked, or nil if the manifest is
// not signed.
func (c *Checker) Signer() []byte { func (c *Checker) Signer() []byte {
if !c.IsSigned() {
return nil
}
return c.signer return c.signer
} }
@@ -184,17 +189,6 @@ func (c *Checker) SigningPubKey() []byte {
return c.signingPubKey return c.signingPubKey
} }
// ExtractEmbeddedSigningKeyFP imports the manifest's embedded public key into a
// temporary keyring and extracts its fingerprint. This validates the key and
// returns its actual fingerprint from the key material itself.
func (c *Checker) ExtractEmbeddedSigningKeyFP(ctx context.Context) (string, error) {
if len(c.signingPubKey) == 0 {
return "", errNoSigningPubKey
}
return gpgExtractPubKeyFingerprint(ctx, c.signingPubKey)
}
// Check verifies all files against the manifest. // Check verifies all files against the manifest.
// Results are sent to the results channel as files are checked. // Results are sent to the results channel as files are checked.
// Progress updates are sent to the progress channel approximately once per second. // Progress updates are sent to the progress channel approximately once per second.
mfer/constants.go
+8 -1
View File
@@ -8,10 +8,17 @@ const (
ReleaseDate = "2025-12-17" ReleaseDate = "2025-12-17"
// MaxDecompressedSize is the maximum allowed size of decompressed manifest // MaxDecompressedSize is the maximum allowed size of decompressed manifest
// data (256 MB). This prevents decompression bombs from consuming excessive // data (256 MiB). This prevents decompression bombs from consuming excessive
// memory. // memory.
MaxDecompressedSize int64 = 256 * 1024 * 1024 MaxDecompressedSize int64 = 256 * 1024 * 1024
// MaxManifestSize is the largest manifest file mfer reads (258 MiB).
// zstd's worst case grows data it cannot compress by 1/256, so an inner
// message of MaxDecompressedSize compresses to at most 257 MiB; the
// last MiB is room for the signature, the signing key and the other
// outer fields.
MaxManifestSize = MaxDecompressedSize + MaxDecompressedSize/256 + 1<<20
// zstdWindowSize is the zstd window zstd.SpeedBestCompression gives mfer's writer. // zstdWindowSize is the zstd window zstd.SpeedBestCompression gives mfer's writer.
zstdWindowSize = 8 << 20 zstdWindowSize = 8 << 20
mfer/deserialize.go
+48 -14
View File
@@ -7,8 +7,8 @@ import (
"errors" "errors"
"fmt" "fmt"
"io" "io"
"strings"
"github.com/google/uuid"
"github.com/klauspost/compress/zstd" "github.com/klauspost/compress/zstd"
"github.com/spf13/afero" "github.com/spf13/afero"
"google.golang.org/protobuf/encoding/protowire" "google.golang.org/protobuf/encoding/protowire"
@@ -19,29 +19,27 @@ import (
var ( var (
errInvalidUUIDLength = errors.New("invalid UUID length") errInvalidUUIDLength = errors.New("invalid UUID length")
errInvalidUUIDFormat = errors.New("invalid UUID format")
errUnknownVersion = errors.New("unknown version") errUnknownVersion = errors.New("unknown version")
errUnknownCompression = errors.New("unknown compression type") errUnknownCompression = errors.New("unknown compression type")
errCompressedHashWrong = errors.New("compressed data hash mismatch") errCompressedHashWrong = errors.New("compressed data hash mismatch")
errSignatureNoPubKey = errors.New("signature present but no public key") errSignatureNoPubKey = errors.New("signature present but no public key")
errDecompressedTooLarge = errors.New("decompressed data exceeds maximum allowed size") errDecompressedTooLarge = errors.New("decompressed data exceeds maximum allowed size")
errManifestTooLarge = errors.New("manifest exceeds maximum allowed size")
errUUIDMismatch = errors.New("outer and inner UUID mismatch") errUUIDMismatch = errors.New("outer and inner UUID mismatch")
errInvalidFileFormat = errors.New("invalid file format") errInvalidFileFormat = errors.New("invalid file format")
errInvalidManifestPath = errors.New("manifest contains invalid path") errInvalidManifestPath = errors.New("manifest contains invalid path")
errDecodedTooLarge = errors.New( errDecodedTooLarge = errors.New(
"manifest would take too much memory to decode") "manifest would take too much memory to decode")
errSignerNotSigningKey = errors.New(
"signer is not the fingerprint of the key that made the signature")
) )
// validateUUID checks that the byte slice is a valid UUID (16 bytes, parseable). // validateUUID checks that the byte slice is the 16 bytes of a binary UUID.
// Any 16 bytes are one, so the length is all there is to check.
func validateUUID(data []byte) error { func validateUUID(data []byte) error {
if len(data) != uuidLength { if len(data) != uuidLength {
return errInvalidUUIDLength return errInvalidUUIDLength
} }
// Try to parse as UUID to validate format
_, err := uuid.FromBytes(data)
if err != nil {
return errInvalidUUIDFormat
}
return nil return nil
} }
@@ -66,8 +64,10 @@ func (m *manifest) validateOuterHeader() error {
return nil return nil
} }
// verifyOuterIntegrity checks the hash of the compressed payload and, // verifyOuterIntegrity checks the hash of the compressed payload and, if a
// if a signature is present, verifies it against the embedded public key. // signature is present, verifies it against the embedded public key, which
// must be one key, and checks that the signer field is that key's
// fingerprint.
func (m *manifest) verifyOuterIntegrity() error { func (m *manifest) verifyOuterIntegrity() error {
h := sha256.New() h := sha256.New()
@@ -97,7 +97,7 @@ func (m *manifest) verifyOuterIntegrity() error {
} }
// Loading a manifest takes no context; gpgTimeout still bounds gpg. // Loading a manifest takes no context; gpgTimeout still bounds gpg.
err = gpgVerify( signingKey, err := gpgVerify(
context.Background(), context.Background(),
[]byte(sigString), []byte(sigString),
m.pbOuter.GetSignature(), m.pbOuter.GetSignature(),
@@ -107,6 +107,11 @@ func (m *manifest) verifyOuterIntegrity() error {
return fmt.Errorf("signature verification failed: %w", err) return fmt.Errorf("signature verification failed: %w", err)
} }
if !strings.EqualFold(string(m.pbOuter.GetSigner()), signingKey) {
return fmt.Errorf("%w: signer %q, signing key %s",
errSignerNotSigningKey, m.pbOuter.GetSigner(), signingKey)
}
log.Infof("signature verified successfully") log.Infof("signature verified successfully")
return nil return nil
@@ -273,6 +278,10 @@ func (m *manifest) deserializeInner() error {
return fmt.Errorf("deserialize: unmarshal inner: %w", err) return fmt.Errorf("deserialize: unmarshal inner: %w", err)
} }
if m.pbInner.GetVersion() != MFFile_VERSION_ONE {
return errUnknownVersion
}
// Validate inner UUID // Validate inner UUID
err = validateUUID(m.pbInner.GetUuid()) err = validateUUID(m.pbInner.GetUuid())
if err != nil { if err != nil {
@@ -289,12 +298,21 @@ func (m *manifest) deserializeInner() error {
// extract path tomorrow — acts on a traversal or absolute path from an // extract path tomorrow — acts on a traversal or absolute path from an
// untrusted .mf. Reject loudly on the first offender rather than // untrusted .mf. Reject loudly on the first offender rather than
// dropping entries, which would let a hostile manifest hide files from a // dropping entries, which would let a hostile manifest hide files from a
// check. // check. A path listed twice is refused too: check would check the one
// file against both entries.
seen := make(map[string]bool, len(m.pbInner.GetFiles()))
for _, f := range m.pbInner.GetFiles() { for _, f := range m.pbInner.GetFiles() {
err = ValidatePath(f.GetPath()) err = ValidatePath(f.GetPath())
if err != nil { if err != nil {
return fmt.Errorf("%w: %w", errInvalidManifestPath, err) return fmt.Errorf("%w: %w", errInvalidManifestPath, err)
} }
if seen[f.GetPath()] {
return fmt.Errorf("%w %q", errDuplicatePath, f.GetPath())
}
seen[f.GetPath()] = true
} }
log.Infof("loaded manifest with %d files", len(m.pbInner.GetFiles())) log.Infof("loaded manifest with %d files", len(m.pbInner.GetFiles()))
@@ -314,13 +332,14 @@ func validateMagic(dat []byte) bool {
return bytes.Equal(got, expected) return bytes.Equal(got, expected)
} }
// NewManifestFromReader reads a manifest from an io.Reader. // NewManifestFromReader reads a manifest from an io.Reader. It refuses a
// manifest larger than MaxManifestSize, reading at most one byte past it.
// //
//nolint:revive // unexported-return: exporting manifest is owner question 13 //nolint:revive // unexported-return: exporting manifest is owner question 13
func NewManifestFromReader(input io.Reader) (*manifest, error) { func NewManifestFromReader(input io.Reader) (*manifest, error) {
m := &manifest{} m := &manifest{}
dat, err := io.ReadAll(input) dat, err := readAtMost(input, MaxManifestSize)
if err != nil { if err != nil {
return nil, err return nil, err
} }
@@ -352,6 +371,21 @@ func NewManifestFromReader(input io.Reader) (*manifest, error) {
return m, nil return m, nil
} }
// readAtMost reads all of input, or refuses it with errManifestTooLarge
// once it passes maxSize bytes, after reading one byte past maxSize.
func readAtMost(input io.Reader, maxSize int64) ([]byte, error) {
dat, err := io.ReadAll(io.LimitReader(input, maxSize+1))
if err != nil {
return nil, err
}
if int64(len(dat)) > maxSize {
return nil, fmt.Errorf("%w of %d bytes", errManifestTooLarge, maxSize)
}
return dat, nil
}
// ManifestFromFileOptions configures NewManifestFromFile. // ManifestFromFileOptions configures NewManifestFromFile.
type ManifestFromFileOptions struct { type ManifestFromFileOptions struct {
// Path is the manifest file to read (required). // Path is the manifest file to read (required).
mfer/deserialize_path_test.go
+72 -20
View File
@@ -7,11 +7,10 @@ import (
"crypto/sha256" "crypto/sha256"
"fmt" "fmt"
"strconv" "strconv"
"strings"
"testing" "testing"
"time" "time"
"uuid"
"github.com/google/uuid"
"github.com/klauspost/compress/zstd" "github.com/klauspost/compress/zstd"
"github.com/multiformats/go-multihash" "github.com/multiformats/go-multihash"
"github.com/stretchr/testify/assert" "github.com/stretchr/testify/assert"
@@ -92,7 +91,7 @@ func TestDeserializeRejectsInvalidEntryPaths(t *testing.T) {
t.Run(tt.name, func(t *testing.T) { t.Run(tt.name, func(t *testing.T) {
t.Parallel() t.Parallel()
id := uuid.New() id := uuid.NewV4()
data := wrapInner(t, id, craftInnerBytes(id, tt.path)) data := wrapInner(t, id, craftInnerBytes(id, tt.path))
_, err := NewManifestFromReader(bytes.NewReader(data)) _, err := NewManifestFromReader(bytes.NewReader(data))
@@ -118,12 +117,61 @@ func TestDeserializeRejectsInvalidEntryPaths(t *testing.T) {
} }
} }
// A manifest that lists a path twice is refused as it is loaded, naming the
// path. Paths are compared byte for byte: two that differ only in letter case
// load, and fetch refuses those itself. Each entry has a hash, as entries mfer
// writes do; entries of a path alone would take too much memory to decode.
func TestDeserializeRefusesPathListedTwice(t *testing.T) {
t.Parallel()
hash, err := multihash.Encode(make([]byte, sha256.Size), multihash.SHA2_256)
require.NoError(t, err)
tests := []struct {
name string
paths []string
refused bool
}{
{"same path twice", []string{"dir/a.txt", "other.txt", "dir/a.txt"}, true},
{"paths differing in letter case", []string{"dir/b.txt", "dir/B.txt"}, false},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
t.Parallel()
id := uuid.NewV4()
inner := &MFFile{Version: MFFile_VERSION_ONE, Uuid: id[:]}
for _, p := range tt.paths {
inner.Files = append(inner.Files, &MFFilePath{
Path: p,
Hashes: []*MFFileChecksum{{MultiHash: hash}},
})
}
innerData, err := proto.Marshal(inner)
require.NoError(t, err)
m, err := NewManifestFromReader(bytes.NewReader(wrapInner(t, id, innerData)))
if tt.refused {
require.ErrorIs(t, err, errDuplicatePath)
require.EqualError(t, err, `duplicate path "dir/a.txt"`)
} else {
require.NoError(t, err)
assert.Len(t, m.Files(), len(tt.paths))
}
})
}
}
// Entries of a path, an empty hash, an empty MIME type and empty modification // Entries of a path, an empty hash, an empty MIME type and empty modification
// and change times are counted at 432 bytes each (176 + 112 + 16 + 64 + 64) // and change times are counted at 432 bytes each (176 + 112 + 16 + 64 + 64)
// and take 16 bytes plus the path to encode. A 37-character path makes that // and take 16 bytes plus the path to encode. A 37-character path makes that
// 53 bytes, about 8.2 times: refused, and leaving any one of the five // 53 bytes, about 8.2 times: refused, and leaving any one of the five
// uncounted, even the MIME type, brings it under 8. A 39-character path makes // uncounted, even the MIME type, brings it under 8. A 39-character path makes
// it 55 bytes, about 7.9 times: loaded. // it 55 bytes, about 7.9 times: loaded. Each entry's path is its number,
// padded with zeros to that length, since a manifest lists a path only once.
func TestDeserializeRefusesEntriesThatDecodeTooLarge(t *testing.T) { func TestDeserializeRefusesEntriesThatDecodeTooLarge(t *testing.T) {
t.Parallel() t.Parallel()
@@ -139,22 +187,24 @@ func TestDeserializeRefusesEntriesThatDecodeTooLarge(t *testing.T) {
t.Run(strconv.Itoa(tt.pathLen), func(t *testing.T) { t.Run(strconv.Itoa(tt.pathLen), func(t *testing.T) {
t.Parallel() t.Parallel()
entry := protowire.AppendTag(nil, 1, protowire.BytesType) // MFFilePath.path id := uuid.NewV4()
entry = protowire.AppendString(entry, strings.Repeat("a", tt.pathLen)) inner := protowire.AppendTag(nil, 100, protowire.VarintType) // MFFile.version
entry = protowire.AppendTag(entry, 3, protowire.BytesType) // MFFilePath.hashes inner = protowire.AppendVarint(inner, uint64(MFFile_VERSION_ONE))
entry = protowire.AppendBytes(entry, nil) inner = protowire.AppendTag(inner, 102, protowire.BytesType) // MFFile.uuid
entry = protowire.AppendTag(entry, 301, protowire.BytesType) // MFFilePath.mimeType
entry = protowire.AppendBytes(entry, nil)
entry = protowire.AppendTag(entry, 302, protowire.BytesType) // MFFilePath.mtime
entry = protowire.AppendBytes(entry, nil)
entry = protowire.AppendTag(entry, 303, protowire.BytesType) // MFFilePath.ctime
entry = protowire.AppendBytes(entry, nil)
id := uuid.New()
inner := protowire.AppendTag(nil, 102, protowire.BytesType) // MFFile.uuid
inner = protowire.AppendBytes(inner, id[:]) inner = protowire.AppendBytes(inner, id[:])
for range 1000 { for i := range 1000 {
entry := protowire.AppendTag(nil, 1, protowire.BytesType) // MFFilePath.path
entry = protowire.AppendString(entry, fmt.Sprintf("%0*d", tt.pathLen, i))
entry = protowire.AppendTag(entry, 3, protowire.BytesType) // MFFilePath.hashes
entry = protowire.AppendBytes(entry, nil)
entry = protowire.AppendTag(entry, 301, protowire.BytesType) // MFFilePath.mimeType
entry = protowire.AppendBytes(entry, nil)
entry = protowire.AppendTag(entry, 302, protowire.BytesType) // MFFilePath.mtime
entry = protowire.AppendBytes(entry, nil)
entry = protowire.AppendTag(entry, 303, protowire.BytesType) // MFFilePath.ctime
entry = protowire.AppendBytes(entry, nil)
inner = protowire.AppendTag(inner, 101, protowire.BytesType) // MFFile.files inner = protowire.AppendTag(inner, 101, protowire.BytesType) // MFFile.files
inner = protowire.AppendBytes(inner, entry) inner = protowire.AppendBytes(inner, entry)
} }
@@ -181,8 +231,10 @@ func TestDeserializeDropsUnknownFields(t *testing.T) {
entry = protowire.AppendString(entry, "a") entry = protowire.AppendString(entry, "a")
entry = append(entry, unknown...) entry = append(entry, unknown...)
id := uuid.New() id := uuid.NewV4()
inner := protowire.AppendTag(nil, 101, protowire.BytesType) // MFFile.files inner := protowire.AppendTag(nil, 100, protowire.VarintType) // MFFile.version
inner = protowire.AppendVarint(inner, uint64(MFFile_VERSION_ONE))
inner = protowire.AppendTag(inner, 101, protowire.BytesType) // MFFile.files
inner = protowire.AppendBytes(inner, entry) inner = protowire.AppendBytes(inner, entry)
inner = protowire.AppendTag(inner, 102, protowire.BytesType) // MFFile.uuid inner = protowire.AppendTag(inner, 102, protowire.BytesType) // MFFile.uuid
inner = protowire.AppendBytes(inner, id[:]) inner = protowire.AppendBytes(inner, id[:])
mfer/deserialize_test.go
+54
View File
@@ -0,0 +1,54 @@
//nolint:testpackage // white-box tests exercise unexported internals
package mfer
import (
"bytes"
"testing"
"uuid"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"google.golang.org/protobuf/proto"
)
// An inner message whose version is not VERSION_ONE, whether version 0 or a
// later one, is refused with the same error as an outer message's.
func TestDeserializeRefusesUnknownInnerVersion(t *testing.T) {
t.Parallel()
for _, version := range []MFFile_Version{MFFile_VERSION_NONE, MFFile_VERSION_ONE + 1} {
t.Run(version.String(), func(t *testing.T) {
t.Parallel()
id := uuid.NewV4()
inner, err := proto.Marshal(&MFFile{Version: version, Uuid: id[:]})
require.NoError(t, err)
_, err = NewManifestFromReader(bytes.NewReader(wrapInner(t, id, inner)))
require.ErrorIs(t, err, errUnknownVersion)
})
}
}
// TestReadAtMost gives readAtMost exactly its maximum, which it must
// return whole, and twice its maximum, which it must refuse after reading
// one byte past the maximum, and no more. NewManifestFromReader reads
// through it with MaxManifestSize; the test uses 64 KiB, since reading
// MaxManifestSize under the race detector takes gigabytes of memory.
func TestReadAtMost(t *testing.T) {
t.Parallel()
const maxSize = 64 << 10
dat, err := readAtMost(bytes.NewReader(make([]byte, maxSize)), maxSize)
require.NoError(t, err)
assert.Len(t, dat, maxSize)
input := bytes.NewReader(make([]byte, 2*maxSize))
_, err = readAtMost(input, maxSize)
require.ErrorIs(t, err, errManifestTooLarge)
require.EqualError(t, err,
"manifest exceeds maximum allowed size of 65536 bytes")
assert.Equal(t, maxSize-1, input.Len(), "bytes left unread")
}
mfer/gpg.go
+123 -84
View File
@@ -41,16 +41,26 @@ const (
// fields in a gpg fingerprint record (the fingerprint is field 10). // fields in a gpg fingerprint record (the fingerprint is field 10).
gpgFingerprintMinFields = 10 gpgFingerprintMinFields = 10
// gpgStatusPrefix starts each status line gpg writes to the file
// descriptor named by --status-fd.
gpgStatusPrefix = "[GNUPG:]"
// gpg option names used from more than one call site. // gpg option names used from more than one call site.
gpgOptArmor = "--armor" gpgOptArmor = "--armor"
gpgOptHomedir = "--homedir" gpgOptHomedir = "--homedir"
gpgOptVerify = "--verify" gpgOptStatusFD = "--status-fd"
gpgOptVerify = "--verify"
) )
var ( var (
errGPGKeyNotFound = errors.New("gpg key not found") errGPGKeyNotFound = errors.New("gpg key not found")
errFingerprintNotFound = errors.New("fingerprint not found for key") errFingerprintNotFound = errors.New("fingerprint not found for key")
errImportedFPRNotFound = errors.New("fingerprint not found in imported key") errSigningKeyCount = errors.New(
"embedded public key block must hold exactly one key")
errNotOneGoodSignature = errors.New(
"gpg did not report exactly one good signature")
errSigningKeyNotReported = errors.New(
"gpg did not report the key that made the signature")
) )
// GPGKeyID represents a GPG key identifier (fingerprint or key ID). // GPGKeyID represents a GPG key identifier (fingerprint or key ID).
@@ -125,7 +135,7 @@ func runGPG(
// parseFingerprint extracts the first fingerprint from gpg --with-colons // parseFingerprint extracts the first fingerprint from gpg --with-colons
// output, or returns ok=false if none is present. // output, or returns ok=false if none is present.
func parseFingerprint(colonOutput string) (string, bool) { func parseFingerprint(colonOutput string) (string, bool) {
for _, line := range strings.Split(colonOutput, "\n") { for line := range strings.SplitSeq(colonOutput, "\n") {
fields := strings.Split(line, ":") fields := strings.Split(line, ":")
if len(fields) >= gpgFingerprintMinFields && if len(fields) >= gpgFingerprintMinFields &&
fields[0] == gpgFingerprintField { fields[0] == gpgFingerprintField {
@@ -136,19 +146,67 @@ func parseFingerprint(colonOutput string) (string, bool) {
return "", false return "", false
} }
// gpgSign creates a detached signature of the data using the specified key. // parseStatusLine returns the arguments of the status line for keyword in
// Returns the armored detached signature. // gpg --status-fd output, or ok=false unless there is exactly one such line
func gpgSign(ctx context.Context, data []byte, keyID GPGKeyID) ([]byte, error) { // and it has arguments.
func parseStatusLine(statusOutput, keyword string) ([]string, bool) {
var found [][]string
for line := range strings.SplitSeq(statusOutput, "\n") {
fields := strings.Fields(line)
if len(fields) > 2 && fields[0] == gpgStatusPrefix && fields[1] == keyword {
found = append(found, fields[2:])
}
}
if len(found) != 1 {
return nil, false
}
return found[0], true
}
// gpgSign creates an armored detached signature of data with the key gpg
// picks for keyID, and returns it with the fingerprint of the key that made
// it, which is a subkey's when gpg signed with a subkey.
func gpgSign(
ctx context.Context, data []byte, keyID GPGKeyID,
) ([]byte, string, error) {
tmpDir, err := os.MkdirTemp("", "mfer-gpg-sign-*")
if err != nil {
return nil, "", fmt.Errorf("failed to create temp dir: %w", err)
}
defer func() { _ = os.RemoveAll(tmpDir) }()
sigFile := filepath.Join(tmpDir, "signature.asc")
// The signature goes to sigFile, so --status-fd 1 can send gpg's status
// lines to stdout; its messages go to stderr.
stdout, stderr, err := runGPG(ctx, bytes.NewReader(data), stdout, stderr, err := runGPG(ctx, bytes.NewReader(data),
"--detach-sign", "--detach-sign",
gpgOptArmor, gpgOptArmor,
"--output", sigFile,
gpgOptStatusFD, "1",
"--local-user", string(keyID), "--local-user", string(keyID),
) )
if err != nil { if err != nil {
return nil, fmt.Errorf("gpg sign failed: %w: %s", err, stderr.String()) return nil, "", fmt.Errorf("gpg sign failed: %w: %s", err, stderr.String())
} }
return stdout.Bytes(), nil // The last argument of SIG_CREATED is the fingerprint of the key that
// made the signature.
created, ok := parseStatusLine(stdout.String(), "SIG_CREATED")
if !ok {
return nil, "", fmt.Errorf("%w: %s", errSigningKeyNotReported, stderr.String())
}
sig, err := os.ReadFile(sigFile) //nolint:gosec // G304: inside tmpDir, made above
if err != nil {
return nil, "", fmt.Errorf("failed to read signature: %w", err)
}
return sig, created[len(created)-1], nil
} }
// gpgExportPublicKey exports the public key for the specified key ID. // gpgExportPublicKey exports the public key for the specified key ID.
@@ -187,12 +245,44 @@ func gpgGetKeyFingerprint(ctx context.Context, keyID GPGKeyID) ([]byte, error) {
return []byte(fpr), nil return []byte(fpr), nil
} }
// gpgExtractPubKeyFingerprint imports a public key into a temporary keyring // gpgImportOneKey imports the public key block in pubKeyFile into the
// and extracts its fingerprint. This verifies the key is valid and returns // keyring in gpgHome. The block must hold exactly one primary key.
// the actual fingerprint from the key material. func gpgImportOneKey(ctx context.Context, gpgHome, pubKeyFile string) error {
func gpgExtractPubKeyFingerprint(ctx context.Context, pubKey []byte) (string, error) { // --status-fd 1 sends gpg's status lines to stdout, which importing
// otherwise leaves empty; its messages go to stderr.
importStdout, importStderr, err := runGPG(ctx, nil,
gpgArgs([]string{gpgOptHomedir, gpgHome, gpgOptStatusFD, "1", "--import"},
pubKeyFile)...,
)
if err != nil {
return fmt.Errorf(
"failed to import public key: %w: %s", err, importStderr.String(),
)
}
// The first argument of IMPORT_RES counts the primary keys gpg read
// from the block, those it then skipped (one with no user ID, for
// example) included.
result, ok := parseStatusLine(importStdout.String(), "IMPORT_RES")
if !ok {
return fmt.Errorf("%w, gpg reported no count", errSigningKeyCount)
}
if result[0] != "1" {
return fmt.Errorf("%w, found %s", errSigningKeyCount, result[0])
}
return nil
}
// gpgVerify verifies a detached signature against data using the provided
// public key, imported into a temporary keyring, and returns the
// fingerprint of the primary key that made the signature. The public key
// must hold exactly one primary key, so that a good signature can come
// from no other key.
func gpgVerify(ctx context.Context, data, signature, pubKey []byte) (string, error) {
// Create temporary directory for GPG operations // Create temporary directory for GPG operations
tmpDir, err := os.MkdirTemp("", "mfer-gpg-fingerprint-*") tmpDir, err := os.MkdirTemp("", "mfer-gpg-verify-*")
if err != nil { if err != nil {
return "", fmt.Errorf("failed to create temp dir: %w", err) return "", fmt.Errorf("failed to create temp dir: %w", err)
} }
@@ -213,67 +303,12 @@ func gpgExtractPubKeyFingerprint(ctx context.Context, pubKey []byte) (string, er
return "", fmt.Errorf("failed to write public key: %w", err) return "", fmt.Errorf("failed to write public key: %w", err)
} }
// Import the public key into the temporary keyring
_, importStderr, err := runGPG(ctx, nil,
gpgArgs([]string{gpgOptHomedir, tmpDir, "--import"}, pubKeyFile)...,
)
if err != nil {
return "", fmt.Errorf(
"failed to import public key: %w: %s", err, importStderr.String(),
)
}
// List keys to get fingerprint
listStdout, listStderr, err := runGPG(ctx, nil,
"--homedir", tmpDir,
"--with-colons",
"--fingerprint",
)
if err != nil {
return "", fmt.Errorf(
"failed to list keys: %w: %s", err, listStderr.String(),
)
}
fpr, ok := parseFingerprint(listStdout.String())
if !ok {
return "", errImportedFPRNotFound
}
return fpr, nil
}
// gpgVerify verifies a detached signature against data using the provided public key.
// It creates a temporary keyring to import the public key for verification.
func gpgVerify(ctx context.Context, data, signature, pubKey []byte) error {
// Create temporary directory for GPG operations
tmpDir, err := os.MkdirTemp("", "mfer-gpg-verify-*")
if err != nil {
return fmt.Errorf("failed to create temp dir: %w", err)
}
defer func() { _ = os.RemoveAll(tmpDir) }()
// Set restrictive permissions
err = os.Chmod(tmpDir, privateDirPerms)
if err != nil {
return fmt.Errorf("failed to set temp dir permissions: %w", err)
}
// Write public key to temp file
pubKeyFile := filepath.Join(tmpDir, "pubkey.asc")
err = os.WriteFile(pubKeyFile, pubKey, privateFilePerms)
if err != nil {
return fmt.Errorf("failed to write public key: %w", err)
}
// Write signature to temp file // Write signature to temp file
sigFile := filepath.Join(tmpDir, "signature.asc") sigFile := filepath.Join(tmpDir, "signature.asc")
err = os.WriteFile(sigFile, signature, privateFilePerms) err = os.WriteFile(sigFile, signature, privateFilePerms)
if err != nil { if err != nil {
return fmt.Errorf("failed to write signature: %w", err) return "", fmt.Errorf("failed to write signature: %w", err)
} }
// Write data to temp file // Write data to temp file
@@ -281,29 +316,33 @@ func gpgVerify(ctx context.Context, data, signature, pubKey []byte) error {
err = os.WriteFile(dataFile, data, privateFilePerms) err = os.WriteFile(dataFile, data, privateFilePerms)
if err != nil { if err != nil {
return fmt.Errorf("failed to write data: %w", err) return "", fmt.Errorf("failed to write data: %w", err)
} }
// Import the public key into the temporary keyring err = gpgImportOneKey(ctx, tmpDir, pubKeyFile)
_, importStderr, err := runGPG(ctx, nil,
gpgArgs([]string{gpgOptHomedir, tmpDir, "--import"}, pubKeyFile)...,
)
if err != nil { if err != nil {
return fmt.Errorf( return "", err
"failed to import public key: %w: %s", err, importStderr.String(),
)
} }
// Verify the signature // --status-fd 1 sends gpg's status lines to stdout, which verifying a
_, verifyStderr, err := runGPG(ctx, nil, // detached signature otherwise leaves empty; its messages go to stderr.
gpgArgs([]string{gpgOptHomedir, tmpDir, gpgOptVerify}, verifyStdout, verifyStderr, err := runGPG(ctx, nil,
gpgArgs([]string{gpgOptHomedir, tmpDir, gpgOptStatusFD, "1", gpgOptVerify},
sigFile, dataFile)..., sigFile, dataFile)...,
) )
if err != nil { if err != nil {
return fmt.Errorf( return "", fmt.Errorf(
"signature verification failed: %w: %s", err, verifyStderr.String(), "signature verification failed: %w: %s", err, verifyStderr.String(),
) )
} }
return nil // gpg writes a VALIDSIG line for each good signature. Its first
// argument is the fingerprint of the key that made the signature,
// which may be a subkey; its last is that of the primary key.
valid, ok := parseStatusLine(verifyStdout.String(), "VALIDSIG")
if !ok {
return "", errNotOneGoodSignature
}
return valid[len(valid)-1], nil
} }
mfer/gpg_test.go
+226 -37
View File
@@ -8,6 +8,7 @@ import (
"os" "os"
"os/exec" "os/exec"
"path/filepath" "path/filepath"
"slices"
"strconv" "strconv"
"strings" "strings"
"syscall" "syscall"
@@ -17,6 +18,7 @@ import (
"github.com/spf13/afero" "github.com/spf13/afero"
"github.com/stretchr/testify/assert" "github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require" "github.com/stretchr/testify/require"
"google.golang.org/protobuf/proto"
) )
// testGPGEnv sets up a temporary GPG home directory with a test key. // testGPGEnv sets up a temporary GPG home directory with a test key.
@@ -35,39 +37,18 @@ func testGPGEnv(t *testing.T) (GPGKeyID, string) {
// Create temporary GPG home directory (0700 by default) // Create temporary GPG home directory (0700 by default)
gpgHome := t.TempDir() gpgHome := t.TempDir()
// Generate a test key with no passphrase genTestKey(t, gpgHome, testKeyParams)
keyParams := `%no-protection
Key-Type: RSA
Key-Length: 2048
Name-Real: MFER Test Key
Name-Email: test@mfer.test
Expire-Date: 0
%commit
`
paramsFile := filepath.Join(gpgHome, "key-params")
require.NoError(t, os.WriteFile(paramsFile, []byte(keyParams), 0o600))
ctx, cancel := context.WithTimeout(context.Background(), gpgTimeout) ctx, cancel := context.WithTimeout(context.Background(), gpgTimeout)
defer cancel() defer cancel()
//nolint:gosec // paramsFile is a test-controlled path inside t.TempDir()
cmd := exec.CommandContext(ctx, "gpg",
"--batch", "--gen-key", paramsFile)
cmd.Env = append(os.Environ(), "GNUPGHOME="+gpgHome)
output, err := cmd.CombinedOutput()
if err != nil {
t.Skipf("failed to generate test GPG key: %v: %s", err, output)
}
// Get the key fingerprint // Get the key fingerprint
cmd = exec.CommandContext(ctx, "gpg", cmd := exec.CommandContext(ctx, "gpg",
"--list-keys", "--with-colons", "test@mfer.test") "--list-keys", "--with-colons", "test@mfer.test")
cmd.Env = append(os.Environ(), "GNUPGHOME="+gpgHome) cmd.Env = append(os.Environ(), "GNUPGHOME="+gpgHome)
output, err = cmd.Output() output, err := cmd.Output()
if err != nil { if err != nil {
t.Fatalf("failed to list test key: %v", err) t.Fatalf("failed to list test key: %v", err)
} }
@@ -75,7 +56,7 @@ Expire-Date: 0
// Parse fingerprint from output // Parse fingerprint from output
var keyID string var keyID string
for _, line := range strings.Split(string(output), "\n") { for line := range strings.SplitSeq(string(output), "\n") {
fields := strings.Split(line, ":") fields := strings.Split(line, ":")
if len(fields) >= gpgFingerprintMinFields && if len(fields) >= gpgFingerprintMinFields &&
fields[0] == gpgFingerprintField { fields[0] == gpgFingerprintField {
@@ -92,13 +73,79 @@ Expire-Date: 0
return GPGKeyID(keyID), gpgHome return GPGKeyID(keyID), gpgHome
} }
// testKeyParams are the gpg key generation parameters of an RSA key that
// signs and does not expire.
const testKeyParams = "Key-Type: RSA\nKey-Length: 2048\nExpire-Date: 0\n"
// genTestKey generates a key with no passphrase for
// "MFER Test Key <test@mfer.test>" from the gpg key generation parameters
// keyParams in gpgHome, which may already hold one.
func genTestKey(t *testing.T, gpgHome, keyParams string) {
t.Helper()
params := "%no-protection\n" + keyParams +
"Name-Real: MFER Test Key\nName-Email: test@mfer.test\n%commit\n"
paramsFile := filepath.Join(gpgHome, "key-params")
require.NoError(t, os.WriteFile(paramsFile, []byte(params), 0o600))
ctx, cancel := context.WithTimeout(context.Background(), gpgTimeout)
defer cancel()
//nolint:gosec // paramsFile is a test-controlled path inside t.TempDir()
cmd := exec.CommandContext(ctx, "gpg",
"--batch", "--gen-key", paramsFile)
cmd.Env = append(os.Environ(), "GNUPGHOME="+gpgHome)
output, err := cmd.CombinedOutput()
if err != nil {
t.Skipf("failed to generate test GPG key: %v: %s", err, output)
}
}
// signedTestManifest returns a manifest of one file signed with keyID.
func signedTestManifest(t *testing.T, keyID GPGKeyID) []byte {
t.Helper()
b := NewBuilder()
b.SetSigningOptions(&SigningOptions{KeyID: keyID})
content := []byte("signed file content")
_, err := b.AddFile("test.txt", FileSize(len(content)), ModTime{}, 0,
bytes.NewReader(content), nil)
require.NoError(t, err)
var buf bytes.Buffer
require.NoError(t, b.Build(context.Background(), &buf))
return buf.Bytes()
}
// rewriteOuter returns manifest with its outer message changed by edit.
// A signature stays good as long as edit leaves the UUID and hash alone.
func rewriteOuter(t *testing.T, manifest []byte, edit func(*MFFileOuter)) []byte {
t.Helper()
outer := new(MFFileOuter)
require.NoError(t, proto.Unmarshal(manifest[len(MAGIC):], outer))
edit(outer)
data, err := proto.Marshal(outer)
require.NoError(t, err)
return append([]byte(MAGIC), data...)
}
func TestGPGSign(t *testing.T) { func TestGPGSign(t *testing.T) {
keyID, gpgHome := testGPGEnv(t) keyID, gpgHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", gpgHome) t.Setenv("GNUPGHOME", gpgHome)
data := []byte("test data to sign") data := []byte("test data to sign")
sig, err := gpgSign(context.Background(), data, keyID) sig, signingKey, err := gpgSign(context.Background(), data, keyID)
require.NoError(t, err) require.NoError(t, err)
assert.Equal(t, string(keyID), signingKey)
assert.NotEmpty(t, sig) assert.NotEmpty(t, sig)
assert.Contains(t, string(sig), "-----BEGIN PGP SIGNATURE-----") assert.Contains(t, string(sig), "-----BEGIN PGP SIGNATURE-----")
assert.Contains(t, string(sig), "-----END PGP SIGNATURE-----") assert.Contains(t, string(sig), "-----END PGP SIGNATURE-----")
@@ -163,15 +210,18 @@ func TestGPGOptionLikeKeyIDIsNotAnOption(t *testing.T) {
assert.NotContains(t, string(fpr), "gpg (GnuPG)") assert.NotContains(t, string(fpr), "gpg (GnuPG)")
} }
// TestGPGSignInvalidKey signs with a key that has no secret key in the
// keyring. The error must hold gpg's messages and none of its status lines.
func TestGPGSignInvalidKey(t *testing.T) { func TestGPGSignInvalidKey(t *testing.T) {
// Set up test environment (we need GNUPGHOME set) // Set up test environment (we need GNUPGHOME set)
_, gpgHome := testGPGEnv(t) _, gpgHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", gpgHome) t.Setenv("GNUPGHOME", gpgHome)
data := []byte("test data") data := []byte("test data")
_, err := gpgSign(context.Background(), data, _, _, err := gpgSign(context.Background(), data,
GPGKeyID("NONEXISTENT_KEY_ID_12345")) GPGKeyID("NONEXISTENT_KEY_ID_12345"))
assert.Error(t, err) require.Error(t, err)
assert.NotContains(t, err.Error(), gpgStatusPrefix)
} }
func TestBuilderWithSigning(t *testing.T) { func TestBuilderWithSigning(t *testing.T) {
@@ -259,15 +309,16 @@ func TestGPGVerify(t *testing.T) {
t.Setenv("GNUPGHOME", gpgHome) t.Setenv("GNUPGHOME", gpgHome)
data := []byte("test data to sign and verify") data := []byte("test data to sign and verify")
sig, err := gpgSign(context.Background(), data, keyID) sig, _, err := gpgSign(context.Background(), data, keyID)
require.NoError(t, err) require.NoError(t, err)
pubKey, err := gpgExportPublicKey(context.Background(), keyID) pubKey, err := gpgExportPublicKey(context.Background(), keyID)
require.NoError(t, err) require.NoError(t, err)
// Verify the signature // Verify the signature; it names the key that made it
err = gpgVerify(context.Background(), data, sig, pubKey) signingKey, err := gpgVerify(context.Background(), data, sig, pubKey)
require.NoError(t, err) require.NoError(t, err)
assert.Equal(t, string(keyID), signingKey)
} }
func TestGPGVerifyInvalidSignature(t *testing.T) { func TestGPGVerifyInvalidSignature(t *testing.T) {
@@ -275,7 +326,7 @@ func TestGPGVerifyInvalidSignature(t *testing.T) {
t.Setenv("GNUPGHOME", gpgHome) t.Setenv("GNUPGHOME", gpgHome)
data := []byte("test data to sign") data := []byte("test data to sign")
sig, err := gpgSign(context.Background(), data, keyID) sig, _, err := gpgSign(context.Background(), data, keyID)
require.NoError(t, err) require.NoError(t, err)
pubKey, err := gpgExportPublicKey(context.Background(), keyID) pubKey, err := gpgExportPublicKey(context.Background(), keyID)
@@ -283,7 +334,7 @@ func TestGPGVerifyInvalidSignature(t *testing.T) {
// Try to verify with different data - should fail // Try to verify with different data - should fail
wrongData := []byte("different data") wrongData := []byte("different data")
err = gpgVerify(context.Background(), wrongData, sig, pubKey) _, err = gpgVerify(context.Background(), wrongData, sig, pubKey)
assert.Error(t, err) assert.Error(t, err)
} }
@@ -292,12 +343,12 @@ func TestGPGVerifyBadPublicKey(t *testing.T) {
t.Setenv("GNUPGHOME", gpgHome) t.Setenv("GNUPGHOME", gpgHome)
data := []byte("test data") data := []byte("test data")
sig, err := gpgSign(context.Background(), data, keyID) sig, _, err := gpgSign(context.Background(), data, keyID)
require.NoError(t, err) require.NoError(t, err)
// Try to verify with invalid public key - should fail // Try to verify with invalid public key - should fail
badPubKey := []byte("not a valid public key") badPubKey := []byte("not a valid public key")
err = gpgVerify(context.Background(), data, sig, badPubKey) _, err = gpgVerify(context.Background(), data, sig, badPubKey)
assert.Error(t, err) assert.Error(t, err)
} }
@@ -368,6 +419,144 @@ func TestManifestTamperedSignatureFails(t *testing.T) {
assert.Error(t, err) assert.Error(t, err)
} }
// TestManifestRefusesSecondEmbeddedKey loads a manifest whose embedded
// public key block holds another key before the key that signed it.
// Loading must refuse it, although the signature is good and the signer
// field names the key that made it.
func TestManifestRefusesSecondEmbeddedKey(t *testing.T) {
otherKey, otherHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", otherHome)
otherPubKey, err := gpgExportPublicKey(context.Background(), otherKey)
require.NoError(t, err)
keyID, gpgHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", gpgHome)
manifest := rewriteOuter(t, signedTestManifest(t, keyID),
func(outer *MFFileOuter) {
outer.SigningPubKey = slices.Concat(otherPubKey, outer.GetSigningPubKey())
})
_, err = NewManifestFromReader(bytes.NewReader(manifest))
require.ErrorIs(t, err, errSigningKeyCount)
}
// TestManifestRefusesSecondEmbeddedKeyWithoutUserID loads a manifest whose
// embedded public key block holds, before the key that signed it, another
// key with its user ID removed, which gpg skips on import. Loading must
// refuse it: the block holds two keys.
func TestManifestRefusesSecondEmbeddedKeyWithoutUserID(t *testing.T) {
otherKey, otherHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", otherHome)
// Keeping only the user IDs that match "nobody" exports none.
otherPubKey, _, err := runGPG(context.Background(), nil,
gpgArgs([]string{
"--export", gpgOptArmor, "--export-filter", "keep-uid=uid = nobody",
}, string(otherKey))...)
require.NoError(t, err)
keyID, gpgHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", gpgHome)
manifest := rewriteOuter(t, signedTestManifest(t, keyID),
func(outer *MFFileOuter) {
outer.SigningPubKey = slices.Concat(
otherPubKey.Bytes(), outer.GetSigningPubKey())
})
_, err = NewManifestFromReader(bytes.NewReader(manifest))
require.ErrorIs(t, err, errSigningKeyCount)
}
// TestManifestRefusesTwoSignatures loads a manifest whose signature field
// holds its good signature twice. Loading must refuse it.
func TestManifestRefusesTwoSignatures(t *testing.T) {
keyID, gpgHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", gpgHome)
manifest := rewriteOuter(t, signedTestManifest(t, keyID),
func(outer *MFFileOuter) {
outer.Signature = slices.Concat(
outer.GetSignature(), outer.GetSignature())
})
_, err := NewManifestFromReader(bytes.NewReader(manifest))
require.ErrorIs(t, err, errNotOneGoodSignature)
}
// TestManifestSignedWithSubkey signs with a key whose primary key can only
// certify, so gpg signs with its signing subkey. The manifest must load,
// with the primary key's fingerprint as signer.
func TestManifestSignedWithSubkey(t *testing.T) {
gpgHome := t.TempDir()
t.Setenv("GNUPGHOME", gpgHome)
genTestKey(t, gpgHome, "Key-Type: RSA\nKey-Length: 2048\nKey-Usage: cert\n"+
"Subkey-Type: RSA\nSubkey-Length: 2048\nSubkey-Usage: sign\n"+
"Expire-Date: 0\n")
primary, err := gpgGetKeyFingerprint(context.Background(), "test@mfer.test")
require.NoError(t, err)
m, err := NewManifestFromReader(bytes.NewReader(
signedTestManifest(t, GPGKeyID("test@mfer.test"))))
require.NoError(t, err)
assert.Equal(t, primary, m.pbOuter.GetSigner())
}
// TestManifestRefusesSignerOtherThanSigningKey loads a manifest whose
// signer field names a key other than the one that made the signature.
func TestManifestRefusesSignerOtherThanSigningKey(t *testing.T) {
keyID, gpgHome := testGPGEnv(t)
t.Setenv("GNUPGHOME", gpgHome)
manifest := rewriteOuter(t, signedTestManifest(t, keyID),
func(outer *MFFileOuter) {
outer.Signer = []byte(strings.Repeat("A", len(keyID)))
})
_, err := NewManifestFromReader(bytes.NewReader(manifest))
require.ErrorIs(t, err, errSignerNotSigningKey)
}
// TestBuilderSigningKeyIDMatchingTwoKeys signs with a key ID that two keys
// in the keyring match. The manifest must embed and name only the key that
// signed it, or loading refuses it.
func TestBuilderSigningKeyIDMatchingTwoKeys(t *testing.T) {
_, gpgHome := testGPGEnv(t)
genTestKey(t, gpgHome, testKeyParams)
t.Setenv("GNUPGHOME", gpgHome)
manifest := signedTestManifest(t, GPGKeyID("test@mfer.test"))
_, err := NewManifestFromReader(bytes.NewReader(manifest))
require.NoError(t, err)
}
// TestBuilderSigningUserIDWithExpiredFirstKey signs with a user ID whose
// first key in the keyring has expired. gpg signs with the other key for
// that user ID, and the manifest must name and embed that key.
func TestBuilderSigningUserIDWithExpiredFirstKey(t *testing.T) {
gpgHome := t.TempDir()
t.Setenv("GNUPGHOME", gpgHome)
// Made in 2020 and valid for one day.
genTestKey(t, gpgHome, "Key-Type: RSA\nKey-Length: 2048\n"+
"Creation-Date: 20200101T000000\nExpire-Date: 1d\n")
expired, err := gpgGetKeyFingerprint(context.Background(), "test@mfer.test")
require.NoError(t, err)
genTestKey(t, gpgHome, testKeyParams)
m, err := NewManifestFromReader(bytes.NewReader(
signedTestManifest(t, GPGKeyID("test@mfer.test"))))
require.NoError(t, err)
assert.NotEqual(t, expired, m.pbOuter.GetSigner())
}
func TestBuilderWithoutSigning(t *testing.T) { func TestBuilderWithoutSigning(t *testing.T) {
t.Parallel() t.Parallel()
@@ -421,7 +610,7 @@ func TestGPGTimeoutKillsGPG(t *testing.T) {
ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond) ctx, cancel := context.WithTimeout(context.Background(), 100*time.Millisecond)
defer cancel() defer cancel()
_, err := gpgSign(ctx, []byte("data"), GPGKeyID("any")) _, _, err := gpgSign(ctx, []byte("data"), GPGKeyID("any"))
require.ErrorIs(t, err, context.DeadlineExceeded) require.ErrorIs(t, err, context.DeadlineExceeded)
assert.Contains(t, err.Error(), "gpg sign failed: gpg timed out") assert.Contains(t, err.Error(), "gpg sign failed: gpg timed out")
} }
@@ -446,7 +635,7 @@ func TestGPGCancelWhenChildHoldsOutput(t *testing.T) {
signErr := make(chan error, 1) signErr := make(chan error, 1)
go func() { go func() {
_, err := gpgSign(ctx, []byte("data"), GPGKeyID("any")) _, _, err := gpgSign(ctx, []byte("data"), GPGKeyID("any"))
signErr <- err signErr <- err
}() }()
mfer/mf.pb.go
+4 -4
View File
@@ -1,6 +1,6 @@
// Code generated by protoc-gen-go. DO NOT EDIT. // Code generated by protoc-gen-go. DO NOT EDIT.
// versions: // versions:
// protoc-gen-go v1.36.11 // protoc-gen-go v1.36.12
// protoc v6.33.4 // protoc v6.33.4
// source: mf.proto // source: mf.proto
@@ -223,11 +223,11 @@ type MFFileOuter struct {
// uuid must match the uuid in the inner message // uuid must match the uuid in the inner message
Uuid []byte `protobuf:"bytes,105,opt,name=uuid,proto3" json:"uuid,omitempty"` Uuid []byte `protobuf:"bytes,105,opt,name=uuid,proto3" json:"uuid,omitempty"`
InnerMessage []byte `protobuf:"bytes,199,opt,name=innerMessage,proto3" json:"innerMessage,omitempty"` InnerMessage []byte `protobuf:"bytes,199,opt,name=innerMessage,proto3" json:"innerMessage,omitempty"`
// detached signature, ascii or binary //detached signature, ascii or binary
Signature []byte `protobuf:"bytes,201,opt,name=signature,proto3,oneof" json:"signature,omitempty"` Signature []byte `protobuf:"bytes,201,opt,name=signature,proto3,oneof" json:"signature,omitempty"`
// full GPG key id //full GPG key id
Signer []byte `protobuf:"bytes,202,opt,name=signer,proto3,oneof" json:"signer,omitempty"` Signer []byte `protobuf:"bytes,202,opt,name=signer,proto3,oneof" json:"signer,omitempty"`
// full GPG signing public key, ascii or binary //full GPG signing public key, ascii or binary
SigningPubKey []byte `protobuf:"bytes,203,opt,name=signingPubKey,proto3,oneof" json:"signingPubKey,omitempty"` SigningPubKey []byte `protobuf:"bytes,203,opt,name=signingPubKey,proto3,oneof" json:"signingPubKey,omitempty"`
unknownFields protoimpl.UnknownFields unknownFields protoimpl.UnknownFields
sizeCache protoimpl.SizeCache sizeCache protoimpl.SizeCache
mfer/scanner.go
+16 -1
View File
@@ -2,6 +2,7 @@ package mfer
import ( import (
"context" "context"
"fmt"
"io" "io"
"io/fs" "io/fs"
"os" "os"
@@ -79,7 +80,8 @@ type FileEntry struct {
type Scanner struct { type Scanner struct {
mu sync.RWMutex mu sync.RWMutex
files []*FileEntry files []*FileEntry
totalBytes FileSize // cached sum of all file sizes paths map[RelFilePath]AbsFilePath // the file at each path in files
totalBytes FileSize // cached sum of all file sizes
options *ScannerOptions options *ScannerOptions
fs afero.Fs fs afero.Fs
excluded []fs.FileInfo // the files named in ExcludePaths that exist excluded []fs.FileInfo // the files named in ExcludePaths that exist
@@ -103,6 +105,7 @@ func NewScannerWithOptions(opts *ScannerOptions) *Scanner {
s := &Scanner{ s := &Scanner{
files: make([]*FileEntry, 0), files: make([]*FileEntry, 0),
paths: make(map[RelFilePath]AbsFilePath),
options: opts, options: opts,
fs: fs, fs: fs,
} }
@@ -478,6 +481,18 @@ func (s *Scanner) enumerateFileWithInfo(
} }
s.mu.Lock() s.mu.Lock()
// Each path is relative to the input path it was found under, so files
// under two input paths can share one.
first, ok := s.paths[entry.Path]
if ok {
s.mu.Unlock()
return fmt.Errorf("%w %q: %s and %s",
errDuplicatePath, entry.Path, first, entry.AbsPath)
}
s.paths[entry.Path] = entry.AbsPath
s.files = append(s.files, entry) s.files = append(s.files, entry)
s.totalBytes += entry.Size s.totalBytes += entry.Size
filesFound := FileCount(len(s.files)) filesFound := FileCount(len(s.files))
mfer/serialize.go
+10 -6
View File
@@ -8,8 +8,8 @@ import (
"fmt" "fmt"
"math" "math"
"time" "time"
"uuid"
"github.com/google/uuid"
"github.com/klauspost/compress/zstd" "github.com/klauspost/compress/zstd"
"google.golang.org/protobuf/proto" "google.golang.org/protobuf/proto"
) )
@@ -88,7 +88,7 @@ func (m *manifest) generateOuter(ctx context.Context) error {
if len(m.fixedUUID) == uuidLength { if len(m.fixedUUID) == uuidLength {
copy(manifestUUID[:], m.fixedUUID) copy(manifestUUID[:], m.fixedUUID)
} else { } else {
manifestUUID = uuid.New() manifestUUID = uuid.NewV4()
} }
m.pbInner.Uuid = manifestUUID[:] m.pbInner.Uuid = manifestUUID[:]
@@ -143,28 +143,32 @@ func (m *manifest) generateOuter(ctx context.Context) error {
} }
// signOuter signs the outer message with the configured GPG key and // signOuter signs the outer message with the configured GPG key and
// embeds the signature, signer fingerprint, and public key. // embeds the signature, signer fingerprint, and public key. The signer
// and public key are those of the key gpg reports it signed with, so that
// a key ID matching more than one key cannot name or embed another key.
func (m *manifest) signOuter(ctx context.Context) error { func (m *manifest) signOuter(ctx context.Context) error {
sigString, err := m.signatureString() sigString, err := m.signatureString()
if err != nil { if err != nil {
return fmt.Errorf("failed to generate signature string: %w", err) return fmt.Errorf("failed to generate signature string: %w", err)
} }
sig, err := gpgSign(ctx, []byte(sigString), m.signingOptions.KeyID) sig, signingKey, err := gpgSign(ctx, []byte(sigString), m.signingOptions.KeyID)
if err != nil { if err != nil {
return fmt.Errorf("failed to sign manifest: %w", err) return fmt.Errorf("failed to sign manifest: %w", err)
} }
m.pbOuter.Signature = sig m.pbOuter.Signature = sig
fingerprint, err := gpgGetKeyFingerprint(ctx, m.signingOptions.KeyID) // Listing the signing key, a subkey's included, puts its primary key's
// fingerprint first.
fingerprint, err := gpgGetKeyFingerprint(ctx, GPGKeyID(signingKey))
if err != nil { if err != nil {
return fmt.Errorf("failed to get key fingerprint: %w", err) return fmt.Errorf("failed to get key fingerprint: %w", err)
} }
m.pbOuter.Signer = fingerprint m.pbOuter.Signer = fingerprint
pubKey, err := gpgExportPublicKey(ctx, m.signingOptions.KeyID) pubKey, err := gpgExportPublicKey(ctx, GPGKeyID(fingerprint))
if err != nil { if err != nil {
return fmt.Errorf("failed to export public key: %w", err) return fmt.Errorf("failed to export public key: %w", err)
} }
script/bootstrap
+6 -5
View File
@@ -22,14 +22,15 @@ YARN_VERSION="1.22.22"
# protoc v33.4, 2026-10-04, for script/generate. The sha256 of each # protoc v33.4, 2026-10-04, for script/generate. The sha256 of each
# platform's release archive is in ensure_protoc. # platform's release archive is in ensure_protoc.
PROTOC_VERSION="33.4" PROTOC_VERSION="33.4"
# gofumpt v0.12.0 for script/gofumpt and protoc-gen-go v1.36.11 for # gofumpt v0.12.0 for script/gofumpt, 2026-10-04, and protoc-gen-go
# script/generate, 2026-10-04: each is installed into bin/ with # v1.36.12 for script/generate, 2026-10-06: each is installed into bin/
# `go install`, pinned to the commit its release tag names. Those two # with `go install`, pinned to the commit its release tag names. Those two
# scripts refuse any other version, so a new pin is changed there too. # scripts refuse any other version, so a new pin is changed there too.
# protoc-gen-go stays at the google.golang.org/protobuf version in go.mod.
GOFUMPT_VERSION="v0.12.0" GOFUMPT_VERSION="v0.12.0"
GOFUMPT_COMMIT="3e07e7e70ac93761d8e79ca0083a19e3d59f753d" GOFUMPT_COMMIT="3e07e7e70ac93761d8e79ca0083a19e3d59f753d"
PROTOC_GEN_GO_VERSION="v1.36.11" PROTOC_GEN_GO_VERSION="v1.36.12"
PROTOC_GEN_GO_COMMIT="96a179180f0ad6bba9b1e7b6e38d0affb0168e9a" PROTOC_GEN_GO_COMMIT="cdd4c5f7406e82462949c7a65defa9f3029c162d"
PKGMGR="" PKGMGR=""
SUDO="" SUDO=""
script/generate
+1 -1
View File
@@ -15,7 +15,7 @@ ROOT="$(cd "$(dirname "$0")/.." && pwd -P)"
# in the mf.pb.go header. # in the mf.pb.go header.
PROTOC_VERSION="33.4" PROTOC_VERSION="33.4"
PROTOC="$ROOT/bin/protoc/bin/protoc" PROTOC="$ROOT/bin/protoc/bin/protoc"
PROTOC_GEN_GO_VERSION="v1.36.11" PROTOC_GEN_GO_VERSION="v1.36.12"
PROTOC_GEN_GO="$ROOT/bin/protoc-gen-go" PROTOC_GEN_GO="$ROOT/bin/protoc-gen-go"
# sha256 <file>: print "<hash> <file>", with sha256sum, or with shasum # sha256 <file>: print "<hash> <file>", with sha256sum, or with shasum
script/vulncheck
Executable
+22
View File
@@ -0,0 +1,22 @@
#!/bin/sh
# script/vulncheck: report known vulnerabilities in the code mfer calls,
# with govulncheck, which reads the Go vulnerability database online.
# It runs as the vulncheck stage of the Dockerfile, on the same Go as the
# test phase, and this builds that stage alone, on the same terms as
# script/lint and script/test.
#
# script/check does not run it: the gate's result depends on this tree
# alone, and this one changes whenever a new advisory is published.
set -eu
SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd -P)"
ROOT="$(cd "$SCRIPT_DIR/.." && pwd -P)"
main() {
cd "$ROOT"
docker build --no-cache \
--target vulncheck \
-t "$("$SCRIPT_DIR/projectname")-vulncheck" .
}
main "$@"