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Adds `mairu harden` (install, --from with sigstore attestation verification, --uninstall/--purge, harden home), re-exec of the hardened copy from unhardened installations with a version-skew warning, a periodic harden suggestion, hardened copies and root-reachability warnings in doctor, the Debian postinst and sysusers/tmpfiles snippets, and a linux-hardened CI job. Attestations are verified with sigstore-verify/sigstore-trust-root, which verify bundles only and fetch the trust root through TUF from an embedded root, with system TLS roots. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Dg17LE9aWqsb1VBUCVcKLM
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Dg17LE9aWqsb1VBUCVcKLM
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Dg17LE9aWqsb1VBUCVcKLM
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Implements docs/specs/005-install.md.
sudo mairu harden: creates themairugroup (refusing members, primary-group users, group passwords), copies the binary asroot:mairu 2755into<harden_home>/libexec/mairu/withcap_ipc_lock, copies shipped helpers, creates/var/lib/mairu{,/users}, and records a root-owned manifest and the/var/lib/mairu/installsinventory.--uninstall [--purge]trusts only that manifest--home,MAIRU_HARDEN_HOME,harden_homein config.json; defaults to/usr/local(Linux)sudo <hardened copy> harden --from FILEverifies the sigstore attestation (signersorah/mairurelease.ymlat av*tag), refuses downgrades;--unattested,--allow-downgradedoctorlists hardened copies and warns about root-reachable users (passwordless sudo, docker/lxd/incus-admin/disk)pkg/sysusers.dandpkg/tmpfiles.dsnippets; alinux-hardenedCI jobAttestation uses
sigstore-verify/sigstore-trust-root(sigstore-rust) rather than thesigstorecrate; they pull reqwest 0.13 with platform-verifier roots on Linux only, growing the release binary by about 2.7 MB. Other deviations are recorded in the spec's Current Status.Note: a binary with
cap_ipc_lock=+epfails to exec whereCAP_IPC_LOCKis outside the bounding set (e.g. default Docker). That already applied to the deb; re-exec warns and continues unhardened there.Verified in Docker (120 checks), including a real
.debinstalled withdpkg -i.🤖 Generated with Claude Code
https://claude.ai/code/session_01Dg17LE9aWqsb1VBUCVcKLM