207 lines
11 KiB
Bash
Executable File
207 lines
11 KiB
Bash
Executable File
#!/usr/bin/env bash
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# The README describes this repository accurately.
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#
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# It carries two facts that are cheap to state and easy to leave behind: how
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# many contracts there are, and which `panama` subcommands exist. Both had
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# already drifted -- the count said 121 when the suite had grown to 125, one day
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# after it was written.
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#
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# A number in prose is not worth much on its own. It is worth something as a
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# claim somebody might rely on, and worth nothing once it is wrong, so it is
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# either checked or it should not be there.
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set -uo pipefail
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repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
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readme="$repo_dir/README.md"
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panama="$repo_dir/bin/panama"
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findings=()
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note() { findings+=("$1"); }
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# ── Verified bootstrap command ───────────────────────────────────────────────
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if grep -qE 'bash[[:space:]]+<\(curl[^)]*/raw/branch/main/boot' "$readme"; then
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note 'the README still executes the mutable main-branch bootstrap'
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fi
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if grep -q '/raw/branch/main/boot' "$readme"; then
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note 'the README still names the mutable main-branch boot URL'
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fi
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require_bootstrap_occurrences() {
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local pattern="$1" expected="$2" explanation="$3" actual
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actual="$(grep -cE -- "$pattern" "$readme")"
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(( actual == expected )) || note "$explanation"
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}
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mapfile -t documented_commits < <(
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sed -nE "s/^bootstrap_commit=['\"]?([0-9a-f]{40})['\"]?$/\1/p" "$readme" | sort -u
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)
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mapfile -t documented_shas < <(
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sed -nE "s/^bootstrap_sha=['\"]?([0-9a-f]{64})['\"]?$/\1/p" "$readme" | sort -u
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)
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if (( ${#documented_commits[@]} != 1 )); then
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note 'the README does not declare one full lowercase 40-hex bootstrap commit'
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else
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documented_commit="${documented_commits[0]}"
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if ! git -C "$repo_dir" cat-file -e "$documented_commit^{commit}" 2>/dev/null; then
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note 'the documented bootstrap commit does not resolve to a repository commit'
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fi
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fi
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if (( ${#documented_shas[@]} != 1 )); then
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note 'the README does not declare one lowercase 64-hex bootstrap SHA-256'
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else
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documented_sha="${documented_shas[0]}"
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fi
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if [[ -n "${documented_commit:-}" && -n "${documented_sha:-}" ]] \
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&& [[ "$(git -C "$repo_dir" show "$documented_commit:boot" 2>/dev/null | sha256sum | cut -d' ' -f1)" != "$documented_sha" ]]; then
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note 'the documented SHA-256 does not match boot in the documented commit'
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fi
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require_bootstrap_occurrences '^bootstrap_commit=[0-9a-f]{40}$' 2 \
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'the desktop and server commands do not declare the same full bootstrap commit'
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require_bootstrap_occurrences '^bootstrap_sha=[0-9a-f]{64}$' 2 \
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'the desktop and server commands do not declare the same full bootstrap SHA-256'
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require_bootstrap_occurrences 'https://git\.gbrown\.org/gib/Panama/raw/commit/\$bootstrap_commit/boot' 2 \
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'the desktop and server commands do not both use the commit-addressed boot URL'
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require_bootstrap_occurrences '--connect-timeout 10' 2 \
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'the desktop and server commands do not both use the 10-second connect timeout'
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require_bootstrap_occurrences '--max-time 30' 2 \
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'the desktop and server commands do not both use the 30-second total timeout'
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require_bootstrap_occurrences '--max-filesize 262144' 2 \
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'the desktop and server commands do not both use the 256 KiB response limit'
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require_bootstrap_occurrences 'mktemp[[:space:]]+-d' 2 \
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'the desktop and server commands do not both use a private temporary directory'
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require_bootstrap_occurrences 'sha256sum[[:space:]]+-c' 2 \
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'the desktop and server commands do not both verify with sha256sum -c'
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require_bootstrap_occurrences 'PANAMA_BOOT_REVISION="?\$bootstrap_commit"?[[:space:]]+PANAMA_BOOT_SHA256="?\$bootstrap_sha"?' 2 \
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'the desktop and server commands do not both pass the verified pins to boot'
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grep -qE 'bash[[:space:]]+"?\$bootstrap"?([[:space:]]|$)' "$readme" \
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|| note 'the README bootstrap does not execute the verified temporary file'
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grep -qE 'bash[[:space:]]+"?\$bootstrap"?[[:space:]]+--server' "$readme" \
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|| note 'the server bootstrap does not reuse the verified temporary file'
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if grep -qE 'curl[^|]*\|[[:space:]]*(bash|sh)|bash[[:space:]]+<\(curl' "$readme"; then
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note 'the README pipes a network response into a shell'
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fi
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# ── The contract count ───────────────────────────────────────────────────────
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#
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# Counted the way `panama test` collects the suite, so the README agrees with
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# what the runner actually reports rather than with a second idea of it.
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actual="$(find "$repo_dir/tests" -type f -not -path '*/fixtures/*' -not -path '*__pycache__*' \
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\( -executable -o -name '*_test.py' \) | wc -l)"
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claimed="$(grep -oE '^[0-9]+ of them, under' "$readme" | grep -oE '^[0-9]+')"
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if [[ -z "$claimed" ]]; then
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note 'the README no longer states a contract count in the form this checks'
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elif (( claimed != actual )); then
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note "the README says $claimed contracts; there are $actual"
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fi
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# ── Root server bootstrap ───────────────────────────────────────────────────
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#
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# This path runs before the repository exists on a fresh VPS. Its safety
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# properties need to be stated beside the public `boot --server` example, not
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# inferred from the shell implementation or buried in a fixture.
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bootstrap_doc="$(sed -n '/^That command also works from a brand-new VPS/,/^`install` asks/p' "$readme" | tr '\n' ' ')"
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require_bootstrap_doc() {
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local pattern="$1" explanation="$2"
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grep -qiE "$pattern" <<<"$bootstrap_doc" || note "$explanation"
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}
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assert_bootstrap_probe_rejected() {
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local name="$1" pattern="$2" weakened_doc="$3"
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if grep -qiE "$pattern" <<<"$weakened_doc"; then
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note "the $name assertion accepts its weakened documentation probe"
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fi
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}
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target_key_requirement='target user owns[^.]*\.ssh[^.]*mode[^.]*([^0-9]|^)0700([^0-9]|$)[^.]*authorized_keys[^.]*mode[^.]*([^0-9]|^)0600([^0-9]|$)'
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parseable_key_requirement='(every|each)[^.]*non-?comment[^.]*authorized_keys[^.]*(OpenSSH|ssh-keygen)[^.]*(parse|valid)|(OpenSSH|ssh-keygen)[^-]*parse[^.]*every[^.]*non-?comment'
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hardening_continues_requirement='hardening[[:space:]]+is[[:space:]]+unavailable[^.]*without[^.]*verified[^.]*key[^.]*install[[:space:]]+continues[^.]*without[[:space:]]+(it|SSH[[:space:]]+hardening)'
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atomic_dropin_requirement='atomic[[:space:]]+same-directory[[:space:]]+drop-in'
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rollback_requirement='validation[^.]*reload[^.]*fail[^.]*(restor|rollback)[^.]*previous[[:space:]]+drop-in'
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effective_policy_requirement='sshd -T[^.]*root[^.]*target|sshd -T[^.]*target[^.]*root'
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require_bootstrap_doc "$target_key_requirement" \
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'the root bootstrap docs do not require target-user ownership with exact 0700/0600 SSH modes'
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require_bootstrap_doc "$parseable_key_requirement" \
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'the root bootstrap docs do not require OpenSSH to parse every non-comment key entry'
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require_bootstrap_doc "$hardening_continues_requirement" \
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'the root bootstrap docs do not say bootstrap continues without unavailable SSH hardening'
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require_bootstrap_doc 'sshd -t' \
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'the root bootstrap docs do not name sshd -t validation'
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require_bootstrap_doc "$effective_policy_requirement" \
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'the root bootstrap docs do not name sshd -T checks for root and target contexts'
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require_bootstrap_doc "$atomic_dropin_requirement" \
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'the root bootstrap docs do not describe the atomic same-directory drop-in'
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require_bootstrap_doc '00-panama\.conf' \
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'the root bootstrap docs do not name the precedence-safe 00-panama.conf drop-in'
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require_bootstrap_doc 'PermitRootLogin[^.]*no[^.]*PasswordAuthentication[^.]*no[^.]*KbdInteractiveAuthentication[^.]*no' \
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'the root bootstrap docs do not state all three effective authentication denials'
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require_bootstrap_doc 'detected (SSH )?unit.*reload|reload.*detected (SSH )?unit' \
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'the root bootstrap docs do not describe reloading the detected SSH unit'
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require_bootstrap_doc "$rollback_requirement" \
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'the root bootstrap docs do not promise rollback on validation or reload failure'
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require_bootstrap_doc 'fixture contracts.*(these|this) (path|branch)|fixture contracts.*test' \
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'the root bootstrap docs do not limit proof to fixture contracts'
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require_bootstrap_doc 'no real daemon reload.*panama test --safe|panama test --safe.*no real daemon reload' \
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'the root bootstrap docs imply a live daemon reload under the safe suite'
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# These prove the semantic assertions above reject the precise omissions they
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# guard against. They mutate only the scoped documentation string; README.md
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# itself remains the real input that must satisfy the contract.
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assert_bootstrap_probe_rejected 'exact SSH modes' "$target_key_requirement" \
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"${bootstrap_doc//0700/700}"
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assert_bootstrap_probe_rejected 'target-user ownership' "$target_key_requirement" \
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"${bootstrap_doc//target user owns/someone owns}"
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weakened_key_doc="${bootstrap_doc//OpenSSH/text tooling}"
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weakened_key_doc="${weakened_key_doc//ssh-keygen/text parser}"
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assert_bootstrap_probe_rejected 'OpenSSH key parsing' "$parseable_key_requirement" \
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"$weakened_key_doc"
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assert_bootstrap_probe_rejected 'hardening availability' "$hardening_continues_requirement" \
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"${bootstrap_doc//unavailable/available}"
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assert_bootstrap_probe_rejected 'hardening continuation' "$hardening_continues_requirement" \
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"${bootstrap_doc//continues/stops}"
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assert_bootstrap_probe_rejected 'atomic drop-in' "$atomic_dropin_requirement" \
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"${bootstrap_doc//atomic /}"
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assert_bootstrap_probe_rejected 'rollback after failure' "$rollback_requirement" \
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"${bootstrap_doc//restores /keeps }"
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assert_bootstrap_probe_rejected 'rollback trigger' "$rollback_requirement" \
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"${bootstrap_doc//fails/works}"
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assert_bootstrap_probe_rejected 'effective target policy' "$effective_policy_requirement" \
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"${bootstrap_doc//target/root}"
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if grep -qiE 'merely writes? (the )?(SSH )?(drop-in|file)|reload failure.*ignored|ignores? .*reload failure' <<<"$bootstrap_doc"; then
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note 'the root bootstrap docs weaken the transaction by treating the write or reload failure as harmless'
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fi
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# ── Documented subcommands exist ─────────────────────────────────────────────
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#
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# A README listing a command the dispatcher does not have sends somebody to a
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# 'Unknown command' error, which reads as a broken install rather than a stale
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# document.
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while read -r subcommand; do
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[[ -n "$subcommand" ]] || continue
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grep -qE "^\s+$subcommand\)" "$panama" \
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|| note "the README documents 'panama $subcommand', which the dispatcher does not handle"
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done < <(sed -n '/^panama [a-z]/s/^panama \([a-z-]*\).*/\1/p' "$readme" | sort -u)
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if (( ${#findings[@]} > 0 )); then
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mapfile -t findings < <(printf '%s\n' "${findings[@]}" | sort -u)
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printf 'readme contract: %d finding(s)\n' "${#findings[@]}" >&2
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printf ' - %s\n' "${findings[@]}" >&2
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exit 1
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fi
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printf 'readme contract: PASS (%d contracts, as documented)\n' "$actual"
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