leviathan
72ac6f8774
The dynamic binary requires glibc 2.38+ — built on ubuntu-latest (2.39+), it refuses to load on Debian 12 (glibc 2.36), older Ubuntu, RHEL 8/9, etc. Hard portability ceiling for the one-liner installer. The musl-static binary (built on Alpine, attached as skeletonkey-x86_64-static) runs on every libc — verified Alpine → Debian/Ubuntu/Fedora/RHEL cross-distro. Costs ~800 KB extra (1.2 MB vs 390 KB) but eliminates the libc-version problem entirely. Default: install.sh now fetches the -static asset for x86_64. Override: SKELETONKEY_DYNAMIC=1 curl … | sh fetches the smaller dynamic binary (for hosts that have modern glibc and want the smaller download). arm64: no static variant attached yet (cross-compiling musl for aarch64 needs a separate toolchain); install.sh still fetches the dynamic arm64 binary, which works on most modern arm64 distros (raspberry-pi / aws graviton / etc.).
131 lines
4.7 KiB
Bash
Executable File
131 lines
4.7 KiB
Bash
Executable File
#!/usr/bin/env bash
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# SKELETONKEY one-shot installer.
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#
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# Usage:
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# curl -sSL https://github.com/KaraZajac/SKELETONKEY/releases/latest/download/install.sh | sh
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#
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# Or with explicit version:
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# SKELETONKEY_VERSION=v0.1.0 curl ... | sh
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#
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# Or install to a different prefix:
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# SKELETONKEY_PREFIX=$HOME/.local/bin curl ... | sh
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#
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# Environment:
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# SKELETONKEY_VERSION release tag (default: latest)
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# SKELETONKEY_PREFIX install dir (default: /usr/local/bin if writable, else error)
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# SKELETONKEY_REPO override repo (default: KaraZajac/SKELETONKEY)
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#
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# Exit codes:
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# 0 — installed successfully
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# 1 — error (unsupported arch, download failure, permission denied)
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# POSIX-friendly: -eu is universal, pipefail only on shells that
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# support it (bash, ksh, dash >= 0.5.12). Without pipefail the
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# installer still exits on the first hard error since every curl/
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# tar/install step is checked explicitly.
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set -eu
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(set -o pipefail) 2>/dev/null && set -o pipefail || true
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REPO="${SKELETONKEY_REPO:-KaraZajac/SKELETONKEY}"
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VERSION="${SKELETONKEY_VERSION:-latest}"
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PREFIX="${SKELETONKEY_PREFIX:-/usr/local/bin}"
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log() { printf '[\033[1;36m*\033[0m] %s\n' "$*" >&2; }
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ok() { printf '[\033[1;32m+\033[0m] %s\n' "$*" >&2; }
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fail() { printf '[\033[1;31m-\033[0m] %s\n' "$*" >&2; exit 1; }
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# Detect architecture
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arch=$(uname -m)
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case "$arch" in
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# x86_64 default: the musl-static binary works on every libc
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# (glibc 2.x of any version, musl, uclibc) — costs ~800 KB extra
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# vs the dynamic build but eliminates the GLIBC_2.NN portability
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# ceiling that bit users on Debian-stable / older RHEL hosts.
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# Set SKELETONKEY_DYNAMIC=1 to fetch the smaller dynamic build
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# (needs glibc >= 2.38, i.e. Ubuntu 24.04 / Debian 13 / RHEL 10).
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x86_64|amd64)
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if [ "${SKELETONKEY_DYNAMIC:-0}" = "1" ]; then
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target=x86_64
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else
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target=x86_64-static
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fi
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;;
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aarch64|arm64) target=arm64 ;;
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*) fail "Unsupported architecture: $arch (only x86_64 and arm64 currently)" ;;
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esac
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log "detected arch: $target"
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# Resolve version → download URL
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if [ "$VERSION" = "latest" ]; then
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url="https://github.com/${REPO}/releases/latest/download/skeletonkey-${target}"
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sha_url="https://github.com/${REPO}/releases/latest/download/skeletonkey-${target}.sha256"
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else
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url="https://github.com/${REPO}/releases/download/${VERSION}/skeletonkey-${target}"
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sha_url="https://github.com/${REPO}/releases/download/${VERSION}/skeletonkey-${target}.sha256"
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fi
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log "downloading from: $url"
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# Need curl. wget fallback would be nice but skipping for simplicity.
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if ! command -v curl >/dev/null 2>&1; then
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fail "curl is required (apt install curl / dnf install curl)"
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fi
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tmp=$(mktemp -d)
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trap 'rm -rf "$tmp"' EXIT
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if ! curl -fsSLo "$tmp/skeletonkey" "$url"; then
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fail "download failed. Check the version exists at https://github.com/${REPO}/releases"
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fi
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# Verify checksum if available
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if curl -fsSLo "$tmp/skeletonkey.sha256" "$sha_url" 2>/dev/null; then
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# The .sha256 file has the binary's original name; normalize for our local copy
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expected=$(awk '{print $1}' "$tmp/skeletonkey.sha256")
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if command -v sha256sum >/dev/null 2>&1; then
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actual=$(sha256sum "$tmp/skeletonkey" | awk '{print $1}')
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elif command -v shasum >/dev/null 2>&1; then
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actual=$(shasum -a 256 "$tmp/skeletonkey" | awk '{print $1}')
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else
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actual=""
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log "no sha256sum/shasum available — skipping checksum verification"
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fi
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if [ -n "$actual" ]; then
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if [ "$actual" = "$expected" ]; then
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ok "checksum verified"
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else
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fail "checksum mismatch (expected $expected, got $actual)"
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fi
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fi
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else
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log "no checksum file at $sha_url — skipping verification"
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fi
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chmod +x "$tmp/skeletonkey"
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# Install. Try $PREFIX directly; if not writable, sudo.
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target_path="$PREFIX/skeletonkey"
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if [ -w "$PREFIX" ] || [ "$(id -u)" -eq 0 ]; then
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mv "$tmp/skeletonkey" "$target_path"
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elif command -v sudo >/dev/null 2>&1; then
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log "$PREFIX needs sudo; you may be prompted for password"
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sudo mv "$tmp/skeletonkey" "$target_path"
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else
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fail "$PREFIX not writable and sudo not available. Try SKELETONKEY_PREFIX=\$HOME/.local/bin"
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fi
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ok "installed: $target_path"
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"$target_path" --version
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cat >&2 <<EOF
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[\033[1;33m!\033[0m] AUTHORIZED TESTING ONLY — see https://github.com/${REPO}/blob/main/docs/ETHICS.md
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Quickstart:
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sudo skeletonkey --scan # what's this box vulnerable to?
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sudo skeletonkey --audit # broader system hygiene
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sudo skeletonkey --detect-rules --format=auditd \\
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| sudo tee /etc/audit/rules.d/99-skeletonkey.rules # deploy detection rules
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See \`skeletonkey --help\` for all commands.
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EOF
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