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98 lines
3.8 KiB
Markdown
98 lines
3.8 KiB
Markdown
# Letro Authentication Service
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This repository contains Letro's fork of the
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[Matrix Authentication Service (MAS)](https://github.com/element-hq/matrix-authentication-service),
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the OIDC-based authentication service for Matrix homeservers,
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developed by [Element](https://element.io/) (Element Creations Ltd. /
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New Vector Ltd.).
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It is published as the corresponding source for the Letro-operated
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authentication service, in compliance with the GNU Affero General
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Public License, version 3 (AGPLv3) §13.
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## Role in the Letro stack
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The Letro Authentication Service is the OIDC provider used by the
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Letro-operated Matrix homeserver for sign-in, sign-up, account
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management and session handling. It is deployed alongside the
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homeserver via the unmodified upstream
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[Element Server Suite (ESS) Helm chart](https://github.com/element-hq/ess-helm)
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and is exposed to end users of the Letro service. Because the
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service is reached by users over a network and Letro modifies it,
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AGPLv3 §13 applies: every user interacting with the running service
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must be offered access to the corresponding source — see
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"Corresponding source" below.
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## Relationship to upstream
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- Upstream project: <https://github.com/element-hq/matrix-authentication-service>
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- Upstream baseline used by this fork: see
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[`UPSTREAM_VERSION`](UPSTREAM_VERSION)
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- Letro modifications, with dates, serving as the AGPLv3 §5(a)
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modification notice for the work as a whole: see
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[`FORK_DIVERGENCE.md`](FORK_DIVERGENCE.md)
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Upstream technical documentation — build instructions, configuration
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reference, operations notes — applies unchanged. See the upstream
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[README](https://github.com/element-hq/matrix-authentication-service#readme)
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and [docs](https://element-hq.github.io/matrix-authentication-service/).
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## Status
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This repository is the production source for the authentication
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service deployed by the Letro-operated homeserver. It is published
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primarily to satisfy AGPLv3 §13; it is not a generally supported
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open-source project and is not intended for third-party reuse.
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## Copyright
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```
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Copyright (c) 2026 Letro Tech GmbH <legal@letro.com> -- modifications
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```
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The upstream copyright lines (Element Creations Ltd., New Vector
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Ltd., and the other upstream contributors) are preserved verbatim
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in the source files and in [`LICENSE`](LICENSE), as required by
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AGPLv3. Letro does not claim authorship of upstream code; the parts
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modified by Letro are identified in
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[`FORK_DIVERGENCE.md`](FORK_DIVERGENCE.md).
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## License
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This software is dual-licensed by Element Creations Ltd. ("Element"):
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1. for free under the GNU Affero General Public License, version 3
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or (at your option) any later version (AGPLv3); or
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2. under a paid Element Commercial License agreement between you and
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Element.
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Letro distributes this fork under option (1), AGPLv3. The full
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licence texts are in [`LICENSE`](LICENSE) and
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[`LICENSE-COMMERCIAL`](LICENSE-COMMERCIAL). Letro's own modifications
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are likewise licensed under AGPLv3.
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## Third-party components
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The authentication service depends on third-party libraries under
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their own licences. A consolidated attribution list, generated from
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the Cargo dependency graph, is published at
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[`THIRD_PARTY_LICENSES.md`](THIRD_PARTY_LICENSES.md).
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## Trademarks
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"Matrix" is a trademark of The Matrix.org Foundation C.I.C.
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"Element", "Matrix Authentication Service" and "MAS" are trademarks
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of Element Creations Ltd. / New Vector Ltd.
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Letro is **not** affiliated with, endorsed by, or sponsored by The
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Matrix.org Foundation or Element. References to the foregoing names
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in this repository's source, documentation, history and
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configuration are made solely to identify the upstream protocol and
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the upstream project from which Letro is derived, as permitted by
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nominative fair use.
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## Contact
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Legal / licensing questions: <legal@letro.com>
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Operating entity / imprint: see <https://www.letro.com/imprint> |