ceph-s3 skillA
ceph-s3 is agent-read markdown (skill) from air-gapped/skills: Run Ceph RGW as an S3 endpoint under Rook (CephObjectStore, CephObjectStoreUser, ObjectBucketClaim, COSI, CephBucketTopic, multisite realms/zones). Core knowledge: the 19.2.6 / 20.2.4 RGW security fixes and their fallout (SigV4 hardening rejecting presigned PUTs and RGW's own multisite forwarding; rgw_sigv4_insecure + rgw_s3_client_max_sig_ver), AWS SDK default checksums vs RGW (CRC64NVME only in Tentacle), bucket index sharding and large-omap warnings, Tentacle's two-phase reshard, RGW accounts.
Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.
What the file says
# ceph-s3 Defaults read from `src/common/options/rgw.yaml.in` at v19.2.6 and v20.2.4; Rook docs at v1.20.7 and master; tracker and ceph-users as cited. Verified **2026-09-23**. ## 19.2.6 / 20.2.4 RGW security fixes and their fallout | CVE | What | Fixed | |---|---|---| | CVE-2026-54330 | SigV4 did not check that added `x-amz-*` headers on a presigned request were signed | 19.2.6, 20.2.4 | | CVE-2026-39944 | STS session-token fields (`is_admin`, account type) could be bit-flipped → RGW admin | 19.2.6, 20.2.4 | | CVE-2025-30156 | CephX (cluster-wide, not RGW-only) — see rook-ceph-best-practices | 19.2.6, 20.2.4 | The SigV4 fix breaks two things: 1. **Presigned PUTs from some clients** (restic, PHP SDKs) that send an unsigned `Content-Type` — rejected (tracker 79674). Workaround: `ceph config set client.rgw rgw_sigv4_insecure true`, until 19.2.7 / 20.2.5. 2. **RGW multisite forwarding** (non-master zone → master, e.g. bucket create): `403 AccessDenied` even with every cluster patched (tracker 79698). `rgw_sigv4_insecure` alone does **not** fix it. Set both `rgw_sigv4_insecure: "true"` and `rgw_s3_client_max_sig_ver: "2"` in every …
Read the whole file at its exact version.
How to install
mdr add air-gapped/skills/ceph-s3@git:20260922.b895457mdr add air-gapped/skills/ceph-s3@sha256:7c200bda6e807016Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.
[](https://markdownregistry.com/a/art_lexvnip47mlyfryj)
1 badge views in 30 days
Versions
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260922.b895457 latest | 2026-09-22 | b895457 | 6,718 B | A | view · diff |
| git:20260922.f2b5f63 | 2026-09-22 | f2b5f63 | 6,522 B | A | view · diff |
| git:20260922.7cd165c | 2026-09-22 | 7cd165c | 6,557 B | A | view · diff |
| git:20260922.2ecf55f | 2026-09-22 | 2ecf55f | 6,564 B | A | view · diff |
| git:20260922.ffb08a5 | 2026-09-22 | ffb08a5 | 6,760 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (6718 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
air-gapped/skills · 5 stars · license MIT · pushed 2026-09-23 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_lexvnip47mlyfryj GET https://markdownregistry.com/api/v1/resolve?ref=air-gapped/skills/ceph-s3 GET https://markdownregistry.com/api/v1/blob/7c200bda6e807016c88218797a1f7d1f5a873a0fb21f6286314ba8cc6d2e380e
Your agent does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.