* Fix S3 signature verification behind reverse proxies
When SeaweedFS is deployed behind a reverse proxy (e.g. nginx, Kong,
Traefik), AWS S3 Signature V4 verification fails because the Host header
the client signed with (e.g. "localhost:9000") differs from the Host
header SeaweedFS receives on the backend (e.g. "seaweedfs:8333").
This commit adds a new -s3.externalUrl parameter (and S3_EXTERNAL_URL
environment variable) that tells SeaweedFS what public-facing URL clients
use to connect. When set, SeaweedFS uses this host value for signature
verification instead of the Host header from the incoming request.
New parameter:
-s3.externalUrl (flag) or S3_EXTERNAL_URL (environment variable)
Example: -s3.externalUrl=http://localhost:9000
Example: S3_EXTERNAL_URL=https://s3.example.com
The environment variable is particularly useful in Docker/Kubernetes
deployments where the external URL is injected via container config.
The flag takes precedence over the environment variable when both are set.
At startup, the URL is parsed and default ports are stripped to match
AWS SDK behavior (port 80 for HTTP, port 443 for HTTPS), so
"http://s3.example.com:80" and "http://s3.example.com" are equivalent.
Bugs fixed:
- Default port stripping was removed by a prior PR, causing signature
mismatches when clients connect on standard ports (80/443)
- X-Forwarded-Port was ignored when X-Forwarded-Host was not present
- Scheme detection now uses proper precedence: X-Forwarded-Proto >
TLS connection > URL scheme > "http"
- Test expectations for standard port stripping were incorrect
- expectedHost field in TestSignatureV4WithForwardedPort was declared
but never actually checked (self-referential test)
* Add Docker integration test for S3 proxy signature verification
Docker Compose setup with nginx reverse proxy to validate that the
-s3.externalUrl parameter (or S3_EXTERNAL_URL env var) correctly
resolves S3 signature verification when SeaweedFS runs behind a proxy.
The test uses nginx proxying port 9000 to SeaweedFS on port 8333,
with X-Forwarded-Host/Port/Proto headers set. SeaweedFS is configured
with -s3.externalUrl=http://localhost:9000 so it uses "localhost:9000"
for signature verification, matching what the AWS CLI signs with.
The test can be run with aws CLI on the host or without it by using
the amazon/aws-cli Docker image with --network host.
Test covers: create-bucket, list-buckets, put-object, head-object,
list-objects-v2, get-object, content round-trip integrity,
delete-object, and delete-bucket — all through the reverse proxy.
* Create s3-proxy-signature-tests.yml
* fix CLI
* fix CI
* Update s3-proxy-signature-tests.yml
* address comments
* Update Dockerfile
* add user
* no need for fuse
* Update s3-proxy-signature-tests.yml
* debug
* weed mini
* fix health check
* health check
* fix health checking
---------
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Chris Lu <chris.lu@gmail.com>
blitt001
3d81d5bef7