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policy: enable proxy network from source policy caps#3895

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tonistiigi merged 2 commits into
docker:masterfrom
tonistiigi:exec-proxy-support
Jun 10, 2026
Merged

policy: enable proxy network from source policy caps#3895
tonistiigi merged 2 commits into
docker:masterfrom
tonistiigi:exec-proxy-support

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buildx support for moby/buildkit#6740

Evaluate source policy caps before solve requests so policies can enable
BuildKit proxy networking. Policy can return caps {"exec.proxy": true}
during the caps request to enable proxy network
support for the solve.

Evaluate source policy caps before solve requests so policies can enable
BuildKit proxy networking. Policy can return caps {"exec.proxy": true}
during the caps request to enable proxy network
support for the solve.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
Comment thread build/opt.go
if err := applyPolicyCaps(ctx, p, bopts, so); err != nil {
return nil, err
}
}

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I think it could poitentially reject existing policies that never request caps?

Maybe we can treat an undefined or empty decision during caps probing as empty caps?

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If the policies do not define caps then it is as good as having caps false. If one policy requires caps and others don't (explicitly or not) then caps still needed.

Comment thread tests/policy_build.go
Comment on lines +65 to +73
server := httpserver.NewTestServer(map[string]*httpserver.Response{
"/file": resp,
})
defer server.Close()

dockerfile := []byte(`
FROM busybox:latest
RUN wget -O- ` + server.URL + `/file
`)

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seems to run through the normal build path because server.URL is a loopback/local endpoint. With the new proxy behavior local services are only reachable in the host+proxy case iiuc

not sure if we can have a proxy-reachable non-loopback test endpoint

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This always fails anyway, but test checks that it fails with "policy deny".

Extend testBuildPolicyCapsProxy so that instead of only checking that
the network proxy was enabled, the build runs a command that makes an
HTTP request to a local test server. The policy denies that URL as an
HTTP source, so the test now verifies that exec traffic actually flows
through the proxy and is subject to source policy, including the deny
message and DENY decision in the build output.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>
@tonistiigi
tonistiigi force-pushed the exec-proxy-support branch from e08f0fc to 25db0fb Compare June 10, 2026 15:59
@tonistiigi
tonistiigi merged commit 4fa5bb2 into docker:master Jun 10, 2026
288 of 291 checks passed
eleboucher pushed a commit to eleboucher/runner that referenced this pull request Jul 9, 2026
This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [buildx](https://github.com/docker/buildx) |  | minor | `v0.34.1` → `v0.35.0` |
| [buildx](https://github.com/docker/buildx) | uses-with | minor | `v0.34.1` → `v0.35.0` |

---

### Release Notes

<details>
<summary>docker/buildx (buildx)</summary>

### [`v0.35.0`](https://github.com/docker/buildx/releases/tag/v0.35.0)

[Compare Source](docker/buildx@v0.34.1...v0.35.0-rc2)

buildx 0.35.0

Welcome to the v0.35.0 release of buildx!

Please try out the release binaries and report any issues at
<https://github.com/docker/buildx/issues>.

##### Contributors

- CrazyMax
- Tõnis Tiigi
- Sebastiaan van Stijn
- Areeb Ahmed
- Jiří Moravčík
- Sopho Merkviladze
- Akihiro Suda
- Jonathan A. Sternberg

##### Notable Changes

- Local output now supports a `mode=delete` attribute for build and bake commands. This mode replaces the destination directory with the build result instead of merging it. Similar to the `--delete` flag in rsync. For safety, this mode is only allowed if the destination directory is a subdirectory of the working directory. To export to other destinations, `--allow=buildx.local.delete` needs to be provided or the action confirmed by the user in the TUI. When exporting multi-platform results, this mode requires BuildKit v0.31.0+. [#&#8203;3883](docker/buildx#3883)
- Source policies now support the new exec proxy feature of BuildKit v0.31.0+ that captures the network traffic of your build steps. To opt in to network proxy, your Dockerfile.rego source policy needs to return `caps: { "exec.proxy": true }` in the evaluation decision. After opting in, you can control what network requests are allowed to be made by the run steps with policy rules for regular `input.http` sources, similar to how this was done for direct HTTP build sources before. You can also opt in your whole builder with `--buildkitd-flags '--proxy-network'` in `buildx create`. [#&#8203;3895](docker/buildx#3895)
- Resource limits can now be set for CPU and memory using the `--resource` flag in `build` and the `resource` key in `bake` commands. This feature requires BuildKit v0.31.0+ and Dockerfile v1.25.0+. [#&#8203;3876](docker/buildx#3876) [#&#8203;3900](docker/buildx#3900)
- Fix possible "closed channel" panic. [#&#8203;3886](docker/buildx#3886)

##### Dependency Changes

- **github.com/aws/aws-sdk-go-v2**                                                  v1.41.7 -> v1.42.0
- **github.com/aws/aws-sdk-go-v2/config**                                           v1.32.17 -> v1.32.24
- **github.com/aws/aws-sdk-go-v2/credentials**                                      v1.19.16 -> v1.19.23
- **github.com/aws/aws-sdk-go-v2/feature/ec2/imds**                                 v1.18.23 -> v1.18.29
- **github.com/aws/aws-sdk-go-v2/internal/configsources**                           v1.4.23 -> v1.4.29
- **github.com/aws/aws-sdk-go-v2/internal/endpoints/v2**                            v2.7.23 -> v2.7.29
- **github.com/aws/aws-sdk-go-v2/internal/v4a**                                     v1.4.24 -> v1.4.30
- **github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding**                 v1.13.9 -> v1.13.12
- **github.com/aws/aws-sdk-go-v2/service/internal/presigned-url**                   v1.13.23 -> v1.13.29
- **github.com/aws/aws-sdk-go-v2/service/signin**                                   v1.0.11 -> v1.1.5
- **github.com/aws/aws-sdk-go-v2/service/sso**                                      v1.30.17 -> v1.31.3
- **github.com/aws/aws-sdk-go-v2/service/ssooidc**                                  v1.35.21 -> v1.36.6
- **github.com/aws/aws-sdk-go-v2/service/sts**                                      v1.42.1 -> v1.43.3
- **github.com/aws/smithy-go**                                                      v1.25.1 -> v1.27.2
- **github.com/containerd/containerd/v2**                                           v2.2.3 -> v2.2.4
- **github.com/containerd/continuity**                                              v0.4.5 -> v0.5.0
- **github.com/containerd/platforms**                                               v1.0.0-rc.2 -> v1.0.0-rc.4
- **github.com/containerd/typeurl/v2**                                              v2.2.3 -> v2.3.0
- **github.com/docker/cli**                                                         v29.4.3 -> v29.5.3
- **github.com/docker/distribution**                                                v2.8.3 ***new***
- **github.com/docker/docker-credential-helpers**                                   v0.9.5 -> v0.9.8
- **github.com/go-openapi/analysis**                                                v0.24.3 -> v0.25.2
- **github.com/go-openapi/jsonpointer**                                             v0.22.5 -> v0.23.1
- **github.com/go-openapi/jsonreference**                                           v0.21.5 -> v0.21.6
- **github.com/go-openapi/runtime**                                                 v0.29.3 -> v0.32.3
- **github.com/go-openapi/runtime/server-middleware**                               v0.30.0 ***new***
- **github.com/go-openapi/spec**                                                    v0.22.4 -> v0.22.5
- **github.com/go-openapi/strfmt**                                                  v0.26.1 -> v0.26.3
- **github.com/go-openapi/swag**                                                    v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/cmdutils**                                           v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/conv**                                               v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/fileutils**                                          v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/jsonname**                                           v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/jsonutils**                                          v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/loading**                                            v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/mangling**                                           v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/netutils**                                           v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/stringutils**                                        v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/typeutils**                                          v0.25.5 -> v0.26.0
- **github.com/go-openapi/swag/yamlutils**                                          v0.25.5 -> v0.26.0
- **github.com/go-openapi/validate**                                                v0.25.2 -> v0.25.3
- **github.com/google/certificate-transparency-go**                                 v1.3.2 -> v1.3.3
- **github.com/google/go-containerregistry**                                        v0.20.7 -> v0.21.6
- **github.com/gorilla/mux**                                                        v1.8.1 ***new***
- **github.com/grpc-ecosystem/grpc-gateway/v2**                                     v2.28.0 -> v2.29.0
- **github.com/in-toto/attestation**                                                v1.1.2 -> v1.2.0
- **github.com/moby/buildkit**                                                      v0.30.0 -> v0.31.0
- **github.com/moby/policy-helpers**                                                [`a39d601`](docker/buildx@a39d60132186) -> [`d5411a9`](docker/buildx@d5411a945cfc)
- **github.com/moby/sys/sequential**                                                v0.6.0 -> v0.7.0
- **github.com/pelletier/go-toml/v2**                                               v2.2.4 -> v2.3.1
- **github.com/prometheus/common**                                                  v0.66.1 -> v0.67.5
- **github.com/prometheus/procfs**                                                  v0.17.0 -> v0.20.1
- **github.com/secure-systems-lab/go-securesystemslib**                             v0.10.0 -> v0.11.0
- **github.com/sigstore/protobuf-specs**                                            v0.5.0 -> v0.5.1
- **github.com/sigstore/rekor**                                                     v1.5.0 -> v1.5.2
- **github.com/sigstore/rekor-tiles/v2**                                            v2.0.1 -> [`5d098a2`](docker/buildx@5d098a2b6443)
- **github.com/sigstore/sigstore**                                                  v1.10.5 -> v1.10.8
- **github.com/sigstore/sigstore-go**                                               v1.1.4 -> v1.2.1
- **github.com/sigstore/timestamp-authority/v2**                                    v2.0.6 -> v2.1.2
- **github.com/theupdateframework/go-tuf/v2**                                       v2.4.1 -> v2.4.2
- **github.com/tonistiigi/fsutil**                                                  [`a2aa163`](docker/buildx@a2aa163d723f) -> [`0257b33`](docker/buildx@0257b3308df4)
- **github.com/transparency-dev/formats**                                           [`404c0d5`](docker/buildx@404c0d5b696c) -> v0.1.1
- **github.com/youmark/pkcs8**                                                      [`a2c0da2`](docker/buildx@a2c0da244d78) ***new***
- **go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc**   v0.68.0 -> v0.69.0
- **go.opentelemetry.io/contrib/instrumentation/net/http/httptrace/otelhttptrace**  v0.68.0 -> v0.69.0
- **go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp**                 v0.68.0 -> v0.69.0
- **go.opentelemetry.io/otel**                                                      v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetricgrpc**             v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/exporters/otlp/otlpmetric/otlpmetrichttp**             v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/exporters/otlp/otlptrace**                             v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc**               v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp**               v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/exporters/stdout/stdouttrace**                         v1.42.0 -> v1.44.0
- **go.opentelemetry.io/otel/metric**                                               v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/sdk**                                                  v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/sdk/metric**                                           v1.43.0 -> v1.44.0
- **go.opentelemetry.io/otel/trace**                                                v1.43.0 -> v1.44.0
- **go.yaml.in/yaml/v2**                                                            v2.4.3 -> v2.4.4
- **google.golang.org/genproto/googleapis/api**                                     [`6f92a3b`](docker/buildx@6f92a3bedf2d) -> [`3dc84a4`](docker/buildx@3dc84a4a5aaa)
- **google.golang.org/genproto/googleapis/rpc**                                     [`6f92a3b`](docker/buildx@6f92a3bedf2d) -> [`3dc84a4`](docker/buildx@3dc84a4a5aaa)
- **google.golang.org/grpc**                                                        v1.80.0 -> v1.81.1
- **google.golang.org/grpc/cmd/protoc-gen-go-grpc**                                 v1.5.1 -> v1.6.1
- **k8s.io/klog/v2**                                                                v2.130.1 -> v2.140.0

Previous release can be found at [v0.34.1](https://github.com/docker/buildx/releases/tag/v0.34.1)

</details>

---

### Configuration

📅 **Schedule**: (UTC)

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♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

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---

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---

This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4yNTIuMSIsInVwZGF0ZWRJblZlciI6IjQzLjI1Mi4xIiwidGFyZ2V0QnJhbmNoIjoibWFpbiIsImxhYmVscyI6WyJLaW5kL0RlcGVuZGVuY3lVcGRhdGUiLCJydW4tZW5kLXRvLWVuZC10ZXN0cyJdfQ==-->

Reviewed-on: https://code.forgejo.org/forgejo/runner/pulls/1603
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