68 lines
2.5 KiB
Markdown
68 lines
2.5 KiB
Markdown
# ctfetch
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Fetch and decode entries from a Static CT log, outputting structured JSON.
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## Modes
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`ctool fetch` operates in two modes depending on the arguments given.
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### Leaf-index mode
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Fetch the entry at a specific leaf index:
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```bash
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ctool fetch [flags] <log-url> <leaf-index> [+sct] [+issuer] [+ctlog] [+all]
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```
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Examples:
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```bash
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ctool fetch https://halloumi2026h1.mon.ct.ipng.ch 629794635
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ctool fetch https://halloumi2026h1.mon.ct.ipng.ch 629794635 +all
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```
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### Tile-dump mode
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Fetch all entries from a tile URL or local file. Automatically detects data tiles (log entries) and hash tiles (Merkle tree hashes).
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```bash
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ctool fetch [flags] <tile-url-or-file> [+sct] [+issuer] [+ctlog] [+all]
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```
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Examples:
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```bash
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ctool fetch https://halloumi2026h1.mon.ct.ipng.ch/tile/data/x002/x460/135
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ctool fetch https://halloumi2026h1.mon.ct.ipng.ch/tile/data/x002/x460/135 +sct +ctlog
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ctool fetch https://halloumi2026h1.mon.ct.ipng.ch/tile/0/x100/999
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ctool fetch --monitoring-url https://halloumi2026h1.mon.ct.ipng.ch tile.bin +issuer
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```
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## Output modifiers
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| Modifier | Description |
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|---|---|
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| `+sct` | Parse embedded Signed Certificate Timestamps from final (non-precert) certificates |
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| `+issuer` | Fetch issuer certificate details from the log's `/issuer/<fp>` endpoint |
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| `+ctlog` | Look up each SCT's log ID in the CT log list and include operator/state details |
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| `+all` | Enable all of `+sct`, `+issuer`, and `+ctlog` |
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## Flags
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| Flag | Default | Description |
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|---|---|---|
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| `--logs-list-url` | `https://www.gstatic.com/ct/log_list/v3/all_logs_list.json` | CT log list URL for `+ctlog` lookups |
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| `--monitoring-url` | _(none)_ | Log root URL for issuer lookups when input is a local file |
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## Hash tiles vs data tiles
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**Data tiles** (`/tile/data/...`) contain DER-encoded certificates and precertificates with metadata (leaf index, timestamp, chain fingerprints). Output modifiers `+sct`, `+issuer`, `+ctlog`, and `+all` only apply here.
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**Hash tiles** (`/tile/N/...`, N ≥ 0) contain raw 32-byte SHA-256 hashes — the internal nodes of the Merkle tree used for inclusion and consistency proofs. `ctfetch` outputs only the list of hashes; using output modifiers with a hash tile is an error.
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## Notes
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- With a tile URL, `+issuer` derives the log root by stripping the `/tile/...` path. With a local file, `--monitoring-url` must be provided.
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- Partial tiles (`.p/N` suffix) are tried first; on 404 the full tile is fetched automatically.
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- The CT log list and issuer certificates are cached in memory per invocation.
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