didericis
33fe8d2c7a
git_gate.py (699 LOC) mixed three responsibilities. Split into: - git_gate_render.py — pure host-side rendering: the gate constants, GitGateUpstream, gitconfig/known-hosts rendering, and the entrypoint / pre-receive / access-hook script builders. - git_gate_provision.py — the gitea deploy-key lifecycle (_provision_dynamic_key / revoke / _resolve_identity_file). - git_gate.py — the GitGate ABC + GitGatePlan, now 169 LOC, re-exporting all moved names (see __all__) so the 19 importers are unchanged. Host-side only (not flat-bundled), so no sidecar import shim. The one test that patched the internal `_provision_dynamic_key` lookup is repointed to its new module (public API unchanged). The two new modules are added to scripts/critical-modules.txt so the decompose doesn't move security code out of the measured core — critical aggregate stays 95% (git_gate 100%, render 100%, provision 97%). Closes #303 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01NkwFXLFff9PYPy4wgVBJp9
503 lines
18 KiB
Python
503 lines
18 KiB
Python
"""Pure host-side rendering for the per-agent git-gate (PRD 0008).
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Builds the agent's `.gitconfig` insteadOf rewrites, the known_hosts
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line, and the entrypoint / pre-receive / access-hook scripts the sidecar
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runs. No docker or forge calls — exposed for tests and reuse across
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backends. Split out of `git_gate.py` so the control surface (`GitGate`)
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and the deploy-key lifecycle (`git_gate_provision`) each read on their
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own; `git_gate` re-exports these names for API stability."""
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from __future__ import annotations
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import shlex
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from dataclasses import dataclass
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from pathlib import Path
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from .manifest import ManifestBottle, ManifestGitEntry
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# Short network alias for git-gate inside the sidecar bundle. The
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# agent's `.gitconfig` insteadOf rewrites resolve through this name.
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GIT_GATE_HOSTNAME = "git-gate"
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# Shared timeout (seconds) for all git-gate subprocess and CGI calls:
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# git daemon (--timeout/--init-timeout), the access-hook subprocess in
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# git_http_backend, and the git http-backend CGI subprocess.
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GIT_GATE_TIMEOUT_SECS = 15
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@dataclass(frozen=True)
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class GitGateUpstream:
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"""One bare repo on the gate. `name` drives the bare-repo path
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(`/git/<name>.git`), the agent's URL after insteadOf rewrite
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(`git://<gate>/<name>.git`), and the per-upstream credential
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paths inside the gate (`/git-gate/creds/<name>-key` and
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`/git-gate/creds/<name>-known_hosts`).
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`identity_file` is the host-side absolute path the gate's start
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step will docker-cp into the container. `known_host_key` is the
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KnownHostKey string from the manifest; the gate's start step
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materialises it into a known_hosts file if non-empty.
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the gate credential paths inside the running sidecar."""
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name: str
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upstream_url: str
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upstream_host: str
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upstream_port: str
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identity_file: str
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known_host_key: str
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known_hosts_file: Path = Path()
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def git_gate_upstreams_for_bottle(bottle: ManifestBottle) -> tuple[GitGateUpstream, ...]:
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"""Lift each `bottle.git` entry into a GitGateUpstream. Unique-Name
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validation already ran in `manifest.ManifestBottle.from_dict`."""
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return tuple(
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GitGateUpstream(
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name=e.Name,
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upstream_url=e.Upstream,
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upstream_host=e.UpstreamHost,
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upstream_port=e.UpstreamPort,
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identity_file=e.IdentityFile,
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known_host_key=e.KnownHostKey,
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)
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for e in bottle.git
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)
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def _gitconfig_validate_value(field: str, value: str) -> None:
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"""Raise ValueError if value contains characters that break gitconfig line syntax."""
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if "\n" in value or "\r" in value:
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raise ValueError(
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f"git-gate: {field} contains a newline, which would inject "
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f"arbitrary gitconfig keys; rejecting manifest entry"
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)
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def git_gate_render_gitconfig(
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entries: tuple[ManifestGitEntry, ...], gate_host: str, *, scheme: str = "git",
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) -> str:
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"""Render the agent's ~/.gitconfig content for git-gate
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`insteadOf` rewrites. Pure host-side, no docker / smolvm;
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exposed for tests + reuse across backends.
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`gate_host` is the part of the URL between `<scheme>://` and the
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repo path — backends differ here:
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- docker: `git-gate` (the short network alias)
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- smolmachines: `<bundle_ip>:<port>` (no DNS in the
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TSI-allowlisted guest)
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Empty `entries` returns an empty string so callers can no-op
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cleanly without conditional formatting at the call site."""
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if not entries:
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return ""
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out = [
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"# bot-bottle git-gate (PRD 0008): every git operation against\n",
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"# a declared upstream routes through the gate, which mirrors\n",
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"# the upstream bidirectionally (gitleaks-scanned push;\n",
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"# fetch-from-upstream-before-every-upload-pack via access-hook).\n",
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]
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for entry in entries:
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_gitconfig_validate_value(f"repos[{entry.Name!r}].url", entry.Upstream)
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out.append(f'[url "{scheme}://{gate_host}/{entry.Name}.git"]\n')
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out.append(f"\tinsteadOf = {entry.Upstream}\n")
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if entry.RemoteKey and entry.RemoteKey != entry.UpstreamHost:
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port = (
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f":{entry.UpstreamPort}"
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if entry.UpstreamPort and entry.UpstreamPort != "22"
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else ""
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)
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alias = (
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f"ssh://{entry.UpstreamUser}@{entry.RemoteKey}{port}/"
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f"{entry.UpstreamPath}"
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)
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_gitconfig_validate_value(f"repos[{entry.Name!r}].url (resolved alias)", alias)
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out.append(f"\tinsteadOf = {alias}\n")
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return "".join(out)
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def git_gate_known_hosts_line(host: str, port: str, key: str) -> str:
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"""Format `host[:port] key` for OpenSSH's known_hosts. Non-default
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ports use the bracketed `[host]:port` form (the form OpenSSH writes
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on disk for hosts reached via a non-22 port)."""
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if port and port != "22":
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target = f"[{host}]:{port}"
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else:
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target = host
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return f"{target} {key}\n"
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def git_gate_render_entrypoint(upstreams: tuple[GitGateUpstream, ...]) -> str:
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"""Posix-sh entrypoint. One `init_repo` call per upstream, then
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`exec git daemon`. The function reads
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`/git-gate/creds/<name>-{key,known_hosts}` (bind-mounted into
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the bundle by the renderer) and wires them into each bare repo's
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config; the access-hook + pre-receive hook pick those paths up
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at fetch / push time."""
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lines = [
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"#!/bin/sh",
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"set -eu",
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"",
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"init_repo() {",
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" name=$1",
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" upstream_url=$2",
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" keyfile=/git-gate/creds/${name}-key",
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" hostsfile=/git-gate/creds/${name}-known_hosts",
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"",
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# `|| true`: PRD 0018 chunk 3+ bind-mounts these RO from the
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# host, so chmod-syscalls fail with EROFS. The files already
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# have the right perms on the host (SSH requires 0600 to load
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# the key in the first place), so the chmod is best-effort
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# cleanup for the legacy docker-cp path where the file
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# landed at the host's umask perms.
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" chmod 600 \"$keyfile\" 2>/dev/null || true",
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" if [ -f \"$hostsfile\" ]; then",
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" chmod 600 \"$hostsfile\" 2>/dev/null || true",
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" fi",
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"",
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" repo=/git/${name}.git",
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" if [ ! -d \"$repo\" ]; then",
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" git init --bare \"$repo\" >/dev/null",
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# --mirror=fetch sets remote.origin.fetch = +refs/*:refs/* so",
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# a later `git fetch origin` mirrors the upstream's full ref",
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# graph (heads, tags, notes) into the bare repo at canonical",
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# paths. It does NOT set remote.origin.mirror=true, so an",
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# explicit `git push origin <ref>:<ref>` still pushes one ref.",
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" git -C \"$repo\" remote add --mirror=fetch origin \"$upstream_url\"",
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" fi",
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" git -C \"$repo\" config git-gate.identityFile \"$keyfile\"",
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" git -C \"$repo\" config git-gate.knownHosts \"$hostsfile\"",
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" git -C \"$repo\" config receive.denyCurrentBranch ignore",
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" git -C \"$repo\" config receive.advertisePushOptions true",
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" git -C \"$repo\" config http.receivepack true",
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" install -m 755 /etc/git-gate/pre-receive \"$repo/hooks/pre-receive\"",
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"}",
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"",
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"mkdir -p /git",
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]
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for u in upstreams:
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lines.append(f"init_repo {shlex.quote(u.name)} {shlex.quote(u.upstream_url)}")
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lines.extend([
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"",
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"exec git daemon \\",
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" --reuseaddr \\",
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f" --timeout={GIT_GATE_TIMEOUT_SECS} \\",
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f" --init-timeout={GIT_GATE_TIMEOUT_SECS} \\",
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" --base-path=/git \\",
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" --export-all \\",
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" --enable=receive-pack \\",
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" --access-hook=/etc/git-gate/access-hook \\",
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" --verbose",
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])
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return "\n".join(lines) + "\n"
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def git_gate_render_hook() -> str:
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"""The shared pre-receive hook: gitleaks-scan all incoming refs,
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then forward each accepted ref to the real upstream (`origin`)
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using the per-repo credential. Failure in either phase aborts
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the push so the agent sees a real rejection. POSIX sh.
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Two phases (scan all, then push all) keeps a hit on ref N from
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half-pushing refs 1..N-1; both phases re-read stdin from a temp
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file because pre-receive's stdin is a one-shot stream."""
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return r"""#!/bin/sh
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# git-gate pre-receive (PRD 0008). Stdin: <old> <new> <ref> per line.
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set -u
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refs_file=$(mktemp)
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trap 'rm -f "$refs_file"' EXIT
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cat > "$refs_file"
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zero=0000000000000000000000000000000000000000
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supervise_gitleaks_allow() {
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log_opts=$1
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ref=$2
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report_file=$(mktemp)
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if ! gitleaks git \
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--log-opts="$log_opts" \
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--no-banner \
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--redact \
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--ignore-gitleaks-allow \
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--report-format=json \
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--report-path="$report_file" \
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--exit-code 0 \
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1>&2; then
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rm -f "$report_file"
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echo "git-gate: gitleaks inline-suppression scan failed for $ref" >&2
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return 1
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fi
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proposal_id=$(
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GITLEAKS_ALLOW_REF="$ref" python3 - "$report_file" <<'PY'
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import datetime
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import hashlib
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import json
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import os
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import sys
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import uuid
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from pathlib import Path
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report_path = Path(sys.argv[1])
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queue_dir = os.environ.get("SUPERVISE_QUEUE_DIR", "")
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slug = os.environ.get("SUPERVISE_BOTTLE_SLUG", "")
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if not queue_dir or not slug:
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sys.exit(2)
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try:
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raw = json.loads(report_path.read_text() or "[]")
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except json.JSONDecodeError:
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sys.exit(3)
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if not isinstance(raw, list):
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sys.exit(3)
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if not raw:
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sys.exit(0)
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ref = os.environ.get("GITLEAKS_ALLOW_REF", "")
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lines = [
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"gitleaks inline suppression requires supervisor approval",
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f"ref: {ref}",
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"",
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]
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for i, finding in enumerate(raw, 1):
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if not isinstance(finding, dict):
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continue
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file_path = finding.get("File", "")
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line_no = finding.get("StartLine", finding.get("Line", ""))
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rule_id = finding.get("RuleID", "")
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commit = finding.get("Commit", "")
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line = finding.get("Line", "")
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lines.extend([
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f"finding {i}:",
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f" file: {file_path}",
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f" line: {line_no}",
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f" rule: {rule_id}",
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f" commit: {commit}",
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f" code: {line}",
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"",
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])
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payload = "\n".join(lines).rstrip() + "\n"
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proposal_id = str(uuid.uuid4())
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proposal = {
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"id": proposal_id,
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"bottle_slug": slug,
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"tool": "gitleaks-allow",
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"proposed_file": payload,
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"justification": (
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"git-gate found gitleaks findings hidden by # gitleaks:allow; "
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"approve only for dummy test fixtures or confirmed false positives"
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),
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"arrival_timestamp": datetime.datetime.now(
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datetime.timezone.utc
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).isoformat(),
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"current_file_hash": hashlib.sha256(payload.encode("utf-8")).hexdigest(),
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}
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queue = Path(queue_dir)
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queue.mkdir(parents=True, exist_ok=True)
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path = queue / f"{proposal_id}.proposal.json"
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tmp = path.with_suffix(path.suffix + ".tmp")
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with tmp.open("w", encoding="utf-8") as f:
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json.dump(proposal, f, indent=2)
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f.write("\n")
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os.chmod(tmp, 0o600)
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os.replace(tmp, path)
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print(proposal_id)
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PY
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)
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rc=$?
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rm -f "$report_file"
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if [ "$rc" -eq 0 ] && [ -z "$proposal_id" ]; then
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return 0
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fi
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if [ "$rc" -ne 0 ]; then
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echo "git-gate: cannot route # gitleaks:allow finding to supervisor; refusing push" >&2
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return 1
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fi
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queue_dir=${SUPERVISE_QUEUE_DIR:-}
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response_file="$queue_dir/${proposal_id}.response.json"
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timeout=${SUPERVISE_GITLEAKS_ALLOW_TIMEOUT_SECONDS:-300}
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case "$timeout" in
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''|*[!0-9]*)
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echo "git-gate: invalid SUPERVISE_GITLEAKS_ALLOW_TIMEOUT_SECONDS=$timeout" >&2
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return 1
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;;
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esac
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echo "git-gate: queued # gitleaks:allow supervisor approval $proposal_id" >&2
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echo "git-gate: approve with './cli.py supervise' to continue this push" >&2
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waited=0
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while [ "$waited" -lt "$timeout" ]; do
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if [ -f "$response_file" ]; then
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status=$(python3 - "$response_file" <<'PY'
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import json
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import sys
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try:
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with open(sys.argv[1], encoding="utf-8") as f:
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raw = json.load(f)
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except (OSError, json.JSONDecodeError):
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sys.exit(1)
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status = raw.get("status")
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if not isinstance(status, str):
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sys.exit(1)
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print(status)
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PY
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) || status=""
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case "$status" in
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approved|modified)
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mkdir -p "$queue_dir/processed"
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mv -f "$queue_dir/${proposal_id}.proposal.json" "$queue_dir/processed/" 2>/dev/null || true
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mv -f "$queue_dir/${proposal_id}.response.json" "$queue_dir/processed/" 2>/dev/null || true
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echo "git-gate: supervisor approved # gitleaks:allow for $ref" >&2
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return 0
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;;
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rejected)
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echo "git-gate: supervisor rejected # gitleaks:allow for $ref" >&2
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return 1
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;;
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*)
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echo "git-gate: invalid supervisor response for # gitleaks:allow" >&2
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return 1
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;;
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esac
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fi
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sleep 1
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waited=$((waited + 1))
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done
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echo "git-gate: supervisor approval timed out for # gitleaks:allow; refusing push" >&2
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return 1
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}
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# Phase 1: gitleaks scan each ref's incoming commits.
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while IFS=' ' read -r old new ref; do
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[ -z "$ref" ] && continue
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[ "$new" = "$zero" ] && continue
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if [ "$old" = "$zero" ]; then
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# New ref: scan only the commits this push introduces — those
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# reachable from $new but not from any ref the gate already has.
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# Everything already on the gate arrived via upstream mirror-fetch
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# or a previously gitleaks-scanned push, so it's already-upstream
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# or already-scanned; re-scanning it (the old `$new` full-ancestry
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# range) only resurfaces historical findings and blocks every new
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# branch. See PRD 0028 / issue #106.
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log_opts="$new --not --all"
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else
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log_opts="$old..$new"
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fi
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echo "git-gate: gitleaks scanning $ref ($log_opts)" >&2
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if ! gitleaks git --log-opts="$log_opts" --no-banner --redact 1>&2; then
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echo "git-gate: gitleaks rejected push to $ref" >&2
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exit 1
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fi
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if ! supervise_gitleaks_allow "$log_opts" "$ref"; then
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exit 1
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fi
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done < "$refs_file"
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# Phase 2: forward each ref to the upstream (`origin`, configured
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# in the entrypoint via `git remote add --mirror=fetch`).
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keyfile=$(git config --get git-gate.identityFile)
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hostsfile=$(git config --get git-gate.knownHosts)
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if [ ! -f "$hostsfile" ]; then
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echo "git-gate: no KnownHostKey configured for this upstream; refusing to push" >&2
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echo "git-gate: add KnownHostKey to the bottle.git entry and restart the bottle" >&2
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exit 1
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fi
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ssh_cmd="ssh -i $keyfile -o UserKnownHostsFile=$hostsfile -o StrictHostKeyChecking=yes -o IdentitiesOnly=yes -o BatchMode=yes -o ConnectTimeout=10"
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push_option_count=${GIT_PUSH_OPTION_COUNT:-0}
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case "$push_option_count" in
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''|*[!0-9]*)
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echo "git-gate: invalid GIT_PUSH_OPTION_COUNT=$push_option_count" >&2
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exit 1
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;;
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esac
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set --
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i=0
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while [ "$i" -lt "$push_option_count" ]; do
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opt=$(printenv "GIT_PUSH_OPTION_$i" || :)
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set -- "$@" --push-option="$opt"
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i=$((i + 1))
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done
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while IFS=' ' read -r old new ref; do
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[ -z "$ref" ] && continue
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if [ "$new" = "$zero" ]; then
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refspec=":$ref"
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elif [ "$old" != "$zero" ] && ! git merge-base --is-ancestor "$old" "$new" 2>/dev/null; then
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refspec="+$new:$ref"
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else
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refspec="$new:$ref"
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fi
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echo "git-gate: forwarding $ref to origin" >&2
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if ! GIT_SSH_COMMAND="$ssh_cmd" git push "$@" origin "$refspec" 1>&2; then
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echo "git-gate: upstream push failed for $ref" >&2
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exit 1
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fi
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done < "$refs_file"
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exit 0
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"""
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def git_gate_render_access_hook() -> str:
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"""`git daemon --access-hook` script. Runs before each protocol
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service; for `upload-pack` (fetch / clone / ls-remote / pull) it
|
|
refreshes the bare repo from upstream first, so the response
|
|
reflects upstream's current state. For other services (notably
|
|
`receive-pack`) it returns 0 immediately and lets the existing
|
|
pre-receive hook gate the operation. POSIX sh.
|
|
|
|
The hook receives:
|
|
$1 service name (`upload-pack`, `receive-pack`, ...)
|
|
$2 absolute path to the resolved repo
|
|
$3 client hostname (unused)
|
|
$4 client tcp address (unused)
|
|
|
|
Fail-closed on upstream errors: the agent's fetch fails too,
|
|
so it never silently sees stale data — matches the PRD's
|
|
'equivalent to operations against the upstream' contract."""
|
|
return r"""#!/bin/sh
|
|
# git-gate access-hook (PRD 0008). $1=service $2=repo $3=host $4=peer
|
|
set -u
|
|
service=$1
|
|
repo_dir=$2
|
|
|
|
# Push path keeps its own gating in pre-receive (gitleaks +
|
|
# forward). Only refresh-from-upstream on fetch operations.
|
|
if [ "$service" != "upload-pack" ]; then
|
|
exit 0
|
|
fi
|
|
|
|
keyfile=$(git -C "$repo_dir" config --get git-gate.identityFile 2>/dev/null || true)
|
|
hostsfile=$(git -C "$repo_dir" config --get git-gate.knownHosts 2>/dev/null || true)
|
|
if [ -z "$keyfile" ] || [ ! -f "$hostsfile" ]; then
|
|
echo "git-gate: missing credentials for $repo_dir; refusing fetch" >&2
|
|
exit 1
|
|
fi
|
|
ssh_cmd="ssh -i $keyfile -o UserKnownHostsFile=$hostsfile -o StrictHostKeyChecking=yes -o IdentitiesOnly=yes -o BatchMode=yes -o ConnectTimeout=10"
|
|
|
|
echo "git-gate: refreshing $repo_dir from upstream" >&2
|
|
if ! GIT_SSH_COMMAND="$ssh_cmd" git -C "$repo_dir" fetch origin --prune >&2; then
|
|
echo "git-gate: upstream fetch failed for $repo_dir; refusing to serve stale data" >&2
|
|
exit 1
|
|
fi
|
|
|
|
# Sync the bare repo's HEAD to upstream's HEAD on the first fetch
|
|
# (when it still points at the `git init --bare` default of
|
|
# refs/heads/master and upstream uses something else, the cloned
|
|
# checkout would fail with "remote HEAD refers to nonexistent ref").
|
|
# Costs one extra ls-remote on first fetch only; subsequent fetches
|
|
# skip the branch. If upstream's default branch changes after the
|
|
# gate has cached it, restart the bottle to resync.
|
|
if ! git -C "$repo_dir" rev-parse --verify HEAD >/dev/null 2>&1; then
|
|
upstream_head=$(GIT_SSH_COMMAND="$ssh_cmd" git -C "$repo_dir" \
|
|
ls-remote --symref origin HEAD 2>/dev/null \
|
|
| awk '/^ref:/ {print $2; exit}')
|
|
if [ -n "$upstream_head" ]; then
|
|
git -C "$repo_dir" symbolic-ref HEAD "$upstream_head" || true
|
|
fi
|
|
fi
|
|
exit 0
|
|
"""
|
|
|