5 Commits

Author	SHA1	Message	Date
leviathan	8938a74d04	detection rules: YARA + Falco for the 6 highest-rank modules + playbook ... Closes the 'rules in the box' gap — the README has claimed YARA + Falco coverage but detect_yara and detect_falco were NULL on every module. This commit lights up both formats for the 6 highest-value modules (covering 10 of 31 registered modules via family-shared rules), and the existing operational playbook gains the format-specific deployment recipes + the cross-format correlation table. YARA rules (8 rules, 9 module-headers, 152 lines): - copy_fail_family — etc_passwd_uid_flip + etc_passwd_root_no_password (shared across copy_fail / copy_fail_gcm / dirty_frag_esp / dirty_frag_esp6 / dirty_frag_rxrpc) - dirty_pipe — passwd UID flip pattern, dirty-pipe-specific tag - dirtydecrypt — 28-byte ELF prefix match on tiny_elf[] + setuid+execve shellcode tail, detects the page-cache overlay landing - fragnesia — 28-byte ELF prefix on shell_elf[] + setuid+setgid+seteuid cascade, detects the 192-byte page-cache overlay - pwnkit — gconv-modules cache file format (small text file with module UTF-8// X// /tmp/...) - pack2theroot — malicious .deb (ar archive + SUID-bash postinst) + /tmp/.suid_bash artifact scan Falco rules (13 rules, 9 module-headers, 219 lines): - pwnkit — pkexec with empty argv + GCONV_PATH/CHARSET env from non-root - copy_fail_family — AF_ALG socket from non-root + NETLINK_XFRM from unprivileged userns + /etc/passwd modified by non-root - dirty_pipe — splice() of setuid/credential file by non-root - dirtydecrypt — AF_RXRPC socket + add_key(rxrpc) by non-root - fragnesia — TCP_ULP=espintcp from non-root + splice of setuid binary - pack2theroot — SUID bit set on /tmp/.suid_bash + dpkg invoked by packagekitd with /tmp/.pk-*.deb + 2x InstallFiles on same transaction Wiring: each module's .detect_yara and .detect_falco struct fields now point at the embedded string. The dispatcher dedups by pointer, so family-shared rules emit once across the 5 sub-modules. docs/DETECTION_PLAYBOOK.md augmented (302 -> 456 lines): - New 'YARA artifact scanning' subsection under SIEM integration with scheduled-scan cron pattern + per-rule trigger table - New 'Falco runtime detection' subsection with deploy + per-rule trigger table - New 'Per-module detection coverage' table — 4-format matrix - New 'Correlation across formats' section — multi-format incident signature per exploit (the 3-of-4 signal pattern) - New 'Worked example: catching DirtyDecrypt end-to-end' walkthrough from Falco page through yara confirmation, recovery, hunt + patch The existing operational lifecycle / SIEM patterns / FP tuning content is preserved unchanged — this commit only adds. Final stats: - auditd: 109 rule statements across 27 modules - sigma: 16 sigma rules across 19 modules - yara: 8 yara rules across 9 module headers (5 family + 4 distinct) - falco: 13 falco rules across 9 module headers The remaining 21 modules can gain YARA / Falco coverage incrementally by populating their detect_yara / detect_falco struct fields.	2026-05-23 00:47:13 -04:00
leviathan	2b1e96336e	core/host: in_range helper + 13-module migration + 12 more tests (29 total) ... Three coordinated changes that build on the host_kernel_at_least landed in 1571b88: 1. core/host gains skeletonkey_host_kernel_in_range(h, lo..., hi...) — a [lo, hi) bounded-interval check for modules that want the 'vulnerable window' semantics directly. Implemented in terms of host_kernel_at_least (so the comparison logic stays in one place). No module uses it yet; available for new modules that want it. 2. 13 modules migrated off the manual if (v->major < X || (v->major == X && v->minor < Y)) { ... } pattern onto if (!skeletonkey_host_kernel_at_least(ctx->host, X, Y, 0)) { ... } One-line replacements, mechanical, no behavior change. Migrated: af_packet2, dirty_pipe, fuse_legacy, netfilter_xtcompat, nf_tables, nft_fwd_dup, nft_payload, nft_set_uaf, overlayfs, overlayfs_setuid, ptrace_traceme, stackrot, vmwgfx. The repo now has zero manual 'v->major < X' patterns — every predates-check reads the same way. 3. tests/test_detect.c expanded from 17 to 29 cases. Adds: Above-fix coverage on h_kernel_6_12 (10 modules previously untested): af_packet, af_packet2, af_unix_gc, netfilter_xtcompat, nft_set_uaf, nft_fwd_dup, nft_payload, stackrot, sequoia, vmwgfx. Ancient-kernel predates coverage on h_kernel_4_4 (2 more cases): nft_set_uaf (introduced 5.1), stackrot (introduced 6.1). Detect-path test coverage now spans most of the corpus that has a testable host-fingerprint gate. Untested modules from here on are either userspace bugs whose detect() doesn't gate on host fields (pwnkit, sudo_samedit, sudoedit_editor), entrybleed (sysfs-direct, no host gate), or the copy_fail_family bridge (no ctx->host integration yet). Verification: Linux (docker gcc:latest, non-root user): 29/29 pass. macOS (local): 31-module build clean, suite reports 'skipped — Linux-only' as designed.	2026-05-22 23:58:38 -04:00
leviathan	36814f272d	modules: migrate remaining 22 modules to ctx->host fingerprint ... Completes the host-fingerprint refactor that started in c00c3b4. Every module now consults the shared ctx->host (populated once at startup by core/host.c) instead of re-doing uname / geteuid / /etc/os-release parsing / fork+unshare(CLONE_NEWUSER) probes per detect(). Migrations applied per module (mechanical, no exploit logic touched): 1. #include "../../core/host.h" inside each module's #ifdef __linux__. 2. kernel_version_current(&v) -> ctx->host->kernel (with the v -> v-> arrow-vs-dot fix for all later usage). Drops ~20 redundant uname() calls across the corpus. 3. geteuid() == 0 (the 'already root, nothing to escalate' gate) -> bool is_root = ctx->host ? ctx->host->is_root : (geteuid() == 0); This is the key change that lets the unit test suite construct non-root fingerprints regardless of the test process's actual euid. 4. Per-detect fork+unshare(CLONE_NEWUSER) probe helpers (named can_unshare_userns / can_unshare_userns_mount across the corpus) are removed wholesale; their call sites now consult ctx->host->unprivileged_userns_allowed, which was probed once at startup. Removes ~10 per-scan fork()s. Modules touched by this commit (22): Batch A (7): dirty_pipe, dirty_cow, ptrace_traceme, pwnkit, cgroup_release_agent, overlayfs_setuid, and entrybleed (no migration target — KPTI gate stays as direct sysfs read; documented as 'no applicable pattern'). Batch B (7): nf_tables, cls_route4, netfilter_xtcompat, af_packet, af_packet2, af_unix_gc, fuse_legacy. Batch C (8): stackrot, nft_set_uaf, nft_fwd_dup, nft_payload, sudo_samedit, sequoia, sudoedit_editor, vmwgfx. Combined with the 4 modules already migrated (dirtydecrypt, fragnesia, pack2theroot, overlayfs) and the 5-module copy_fail_family bridge, the entire registered corpus now goes through ctx->host. The 4 'fork+unshare per detect()' helpers that existed across nf_tables, cls_route4, netfilter_xtcompat, af_packet, af_packet2, fuse_legacy, nft_set_uaf, nft_fwd_dup, nft_payload, sequoia, cgroup_release_agent, and overlayfs_setuid are now gone — replaced by the single startup probe in core/host.c. Verification: - Linux (docker gcc:latest + libglib2.0-dev): full clean build links 31 modules; tests/test_detect.c: 8/8 pass. - macOS (local): full clean build links 31 modules (Mach-O, 172KB); test suite reports skipped as designed on non-Linux. Subsequent commits can add more EXPECT_DETECT cases in tests/test_detect.c — the host-fingerprint paths in every module are now uniformly testable via synthetic struct skeletonkey_host instances.	2026-05-22 23:43:20 -04:00
leviathan	cdb8f5e8f9	all modules: wrap Linux-only code in #ifdef __linux__ — full macOS build works ... Every kernel-LPE module that uses Linux-only headers (splice, posix_fadvise, linux/netlink.h, sys/ptrace.h, etc.) now follows the same #ifdef __linux__ pattern the new modules already used: Linux body in the ifdef, stub detect/exploit/cleanup returning SKELETONKEY_PRECOND_FAIL on non-Linux, platform-neutral rule strings + module struct + register fn left outside. 14 modules wrapped: dirty_pipe (already done above), af_packet, af_packet2, cgroup_release_agent, cls_route4, dirty_cow, fuse_legacy, netfilter_xtcompat, nf_tables, nft_fwd_dup, nft_payload, overlayfs, overlayfs_setuid, ptrace_traceme. Several modules previously had ad-hoc partial stubs (af_packet2 faked SIOCSIFFLAGS/MAP_LOCKED, netfilter_xtcompat faked sysv-msg syscalls, the nft_* modules had 3 partial __linux__ islands each, fuse_legacy / nf_tables had inner-only ifdef blocks) — all replaced with the uniform outer-wrap shape from dirty_pipe / dirtydecrypt / fragnesia / pack2theroot. Where a module includes core/kernel_range.h, core/finisher.h, or core/offsets.h, those are now inside the ifdef block as well — silences clangd's "unused-includes" LSP warning on macOS while keeping them present for the real Linux build. No exploit logic, constant, struct, shellcode byte, or rule string was modified — only include placement and ifdef markers. Build verification: macOS (local): make clean && make → Mach-O x86_64, 31 modules registered, --scan reports each Linux-only module as "Linux-only module — not applicable here". Linux (docker gcc:latest + libglib2.0-dev): make clean && make → ELF 64-bit, 31 modules. Exploit code paths unchanged.	2026-05-22 22:58:16 -04:00
leviathan	9593d90385	rename: IAMROOT → SKELETONKEY across the entire project ... Breaking change. Tool name, binary name, function/type names, constant names, env vars, header guards, file paths, and GitHub repo URL all rebrand IAMROOT → SKELETONKEY. Changes: - All "IAMROOT" → "SKELETONKEY" (constants, env vars, enum values, docs, comments) - All "iamroot" → "skeletonkey" (functions, types, paths, CLI) - iamroot.c → skeletonkey.c - modules/*/iamroot_modules.{c,h} → modules/*/skeletonkey_modules.{c,h} - tools/iamroot-fleet-scan.sh → tools/skeletonkey-fleet-scan.sh - Binary "iamroot" → "skeletonkey" - GitHub URL KaraZajac/IAMROOT → KaraZajac/SKELETONKEY - .gitignore now expects build output named "skeletonkey" - /tmp/iamroot-* tmpfiles → /tmp/skeletonkey-* - Env vars IAMROOT_MODPROBE_PATH etc. → SKELETONKEY_* New ASCII skeleton-key banner (horizontal key icon + ANSI Shadow SKELETONKEY block letters) replaces the IAMROOT banner in skeletonkey.c and README.md. VERSION: 0.3.1 → 0.4.0 (breaking). Build clean on Debian 6.12.86. `skeletonkey --version` → 0.4.0. All 24 modules still register; no functional code changes — pure rename + banner refresh.	2026-05-16 22:43:49 -04:00