sandwich-hime/SECURITY.md

Security policy

Sandwich Hime compiler v1.0.0-beta.2 and runtime sando/v1.0.0-beta.1 are supported within a deliberately narrow scope: learning, classroom projects, evaluation, and compatibility testing. Security reports are welcome and receive best-effort maintainer assessment and fixes while this pair is current. This is not production support, an SLA, a fitness guarantee, or a promise that a fix will preserve beta APIs.

The community is invited to help find portability gaps outside the maintained Linux target, but those reports do not create a support or release commitment. That invitation does not outsource security assurance. Maintainers retain responsibility for vulnerability review, triage, remediation decisions, advisories, and release decisions.

Supported versions

Version	Security status
v1.0.0-beta.2 compiler and sando/v1.0.0-beta.1 runtime	Current evaluation/classroom prerelease pair; best-effort security assessment and fixes; interfaces may change
Public main	Development source; reports welcome, but no compatibility or production-support promise
Older prereleases	Superseded when a newer prerelease or final version is published; reports are still triaged to determine affected versions

Beta support lasts until it is superseded or explicitly withdrawn in the supported-version table and release notes. Published tags are immutable. A security fix is issued as a new version, never by silently replacing a tag.

Report a vulnerability privately

Email security@sandwichhime.com. Please do not put an undisclosed vulnerability, working exploit, credential, secret, or personal data in a public issue.

If that new mailbox rejects or bounces a message, retain the report and open a canonical Gitea issue containing only the fact that the private security contact failed. Do not include technical details or sensitive data. The maintainer will publish a corrected private route. Ordinary usage, classroom, and portability compatibility reports that do not reveal a vulnerability may use a public issue.

Helpful reports include:

• the affected compiler/runtime version or exact commit;
• the relevant .sando source, generated Go, or development configuration;
• a minimal reproducer and the observed security impact;
• operating system, architecture, Go version, and browser when relevant;
• whether the issue is already public or has a disclosure deadline; and
• a safe way to credit the reporter, or a request to remain anonymous.

Minimize sensitive data. The mailbox is the private reporting route, but ordinary email is not end-to-end encrypted. Do not send production secrets or unnecessary personal data. An encryption key will be published only after its ownership, backup, and recovery procedure have been tested.

What to expect

These are best-effort targets for a founder-maintained project, not an SLA. They describe maintainer responsibilities; asking the community to test a beta does not ask reporters to investigate or remediate it:

• acknowledge a report within 7 calendar days;
• provide an initial severity/scope assessment within 14 calendar days when a reproducible issue is available; and
• provide an update at least every 30 calendar days while an accepted report remains unresolved.

Health, disability, family responsibility, incomplete evidence, or incident complexity may make those targets impossible. If that happens, the maintainer will communicate the delay when safely able rather than inventing certainty.

For a reproducible accepted vulnerability, the project aims to retain a private reproducer where safe, add a regression test where practical, document affected versions, and agree on a coordinated disclosure plan when appropriate. A fix may be delivered through a new immutable version, a retraction, an advisory, or documentation that narrows an incorrect guarantee. Published tags will not be moved or silently replaced.

Scope and trust boundary

The most useful reports concern:

• contextual escaping or browser-parser disagreements;
• unsafe URL acceptance or trusted-value boundary confusion;
• parser, generator, path, symlink, ownership, or atomic-write failures;
• generated-code/runtime ABI mismatches;
• deterministic-output or source-provenance failures;
• development proxy exposure, request-origin controls, process cleanup, or unintended execution; and
• dependency, release, signing, checksum, or artifact-integrity problems.

Templates and embedded Go are trusted application source. Sandwich Hime is not a sandbox for an untrusted template author. Handwritten Go implementations of sando.Component and explicit sando.Trust* calls are trusted output capabilities. Application routing, authorization, HTTP headers, database security, deployment, and production process isolation remain application responsibilities unless a defect originates in Sandwich Hime itself.

The complete boundary and known non-goals are maintained in the threat model. Reproducible assessment results and open gaps are recorded separately in the security evidence ledger.

Good-faith research

Good-faith research means making a reasonable effort to:

• test only systems, repositories, and data you own or are authorized to test;
• prefer local reproductions and the smallest proof necessary;
• stop if testing risks availability, privacy, data integrity, or another person's account;
• avoid persistence, destructive changes, social engineering, spam, denial of service, credential collection, and unnecessary data access;
• retain and transmit the minimum sensitive information required; and
• allow reasonable time for investigation before public disclosure.

This policy permits research on local copies of the source. It does not authorize active testing of project-operated websites, Gitea infrastructure, or third-party deployments without separate written permission. Passively observed issues are welcome. It does not create a bug bounty, safe-harbor contract, embargo obligation, or promise that every report can be accepted. The project will not pursue action against research that the maintainer reasonably believes followed this policy in good faith, but cannot bind third parties or override applicable law. When uncertain, contact the security mailbox before testing.

Current assurance level

The code has maintainer-led threat modeling, adversarial unit and integration tests, race testing, bounded fuzz smoke tests, static analysis, dependency inventory, and known-vulnerability scanning. The evidence ledger records those maintainer-run checks against named commits and dates; its results are point-in-time evidence, not continuous assurance. The project has not received an independent security audit, certification, or formal verification. Coverage percentages, passing scanners, and a clean vulnerability database result are evidence of specific checks—not proof that no vulnerability exists.

The Beta 2 language server is read-only and standard-library-only. Its tests exercise bounded framing, malformed messages, cancellation, UTF-16 positions, unsaved overlays, workspace re-indexing, and no generated writes. Source review forbids process execution and network-client imports inside the server. Editor workspace trust and executable resolution remain editor-client responsibilities.

Beta 1 uses signed annotated source tags, but precedes the complete prebuilt-artifact and key-recovery system. Signed binaries, checksums, an SBOM, reproducible archives, and complete source/build provenance are release-candidate and final-v1 gates. Their absence from a source-only beta must not be read as evidence of artifact authenticity beyond the verified tag and canonical source.

This policy is practical project guidance, not legal advice.