AACS 2.0 full pipeline: handshake, bus key, decrypt, transparent API
- aacs.rs: content decryption (AES-CBC aligned units, bus decrypt, VUK derivation, unit key decrypt). 11 tests including synthetic roundtrip. - aacs_handshake.rs: SCSI authentication (ECDH on AACS 160-bit curve, ECDSA sign/verify, AES-CMAC, bus key derivation, read_data_key). 14 tests including EC order, ECDH shared secret, cert verification. - disc.rs: transparent API — Disc::scan() detects AACS, authenticates, derives keys internally. ContentReader decrypts on the fly. App never sees AACS details. - error.rs: AacsError (E7000) variant BF v12 complete: 284 unique matches from 8 AWS instances.
This commit is contained in:
MattJackson
+430
-3
@@ -23,6 +23,10 @@ pub struct Disc {
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pub capacity_sectors: u32,
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/// Titles sorted by duration (longest first), then playlist name
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pub titles: Vec<Title>,
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/// AACS state — None if disc is unencrypted or keys unavailable
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pub aacs: Option<AacsState>,
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/// Whether this disc requires AACS decryption
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pub encrypted: bool,
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}
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/// A title (one MPLS playlist).
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@@ -247,15 +251,438 @@ impl Stream {
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}
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}
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// ─── AACS state ─────────────────────────────────────────────────────────────
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/// AACS decryption state for a disc.
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#[derive(Debug)]
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pub struct AacsState {
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/// Volume Unique Key
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pub vuk: [u8; 16],
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/// Decrypted unit keys indexed by CPS unit number
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pub unit_keys: Vec<(u32, [u8; 16])>,
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/// Read data key (AACS 2.0 bus decryption) — None for AACS 1.0
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pub read_data_key: Option<[u8; 16]>,
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/// Whether bus encryption is enabled
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pub bus_encryption: bool,
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}
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// ─── Disc scanning ──────────────────────────────────────────────────────────
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// Placeholder — the actual implementation will be wired in
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// when the CLI's disc_info.rs parsing is migrated here.
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// For now, the CLI does its own parsing.
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/// Options for disc scanning.
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pub struct ScanOptions {
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/// Path to KEYDB.cfg for AACS key lookup.
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/// If None, tries ~/.config/aacs/KEYDB.cfg and /etc/aacs/KEYDB.cfg.
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pub keydb_path: Option<std::path::PathBuf>,
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}
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impl Default for ScanOptions {
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fn default() -> Self {
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ScanOptions { keydb_path: None }
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}
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}
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impl ScanOptions {
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/// Create options with a specific KEYDB path.
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pub fn with_keydb(path: impl Into<std::path::PathBuf>) -> Self {
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ScanOptions { keydb_path: Some(path.into()) }
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}
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/// Resolve KEYDB path: explicit, then standard locations.
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fn resolve_keydb(&self) -> Option<std::path::PathBuf> {
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if let Some(p) = &self.keydb_path {
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if p.exists() { return Some(p.clone()); }
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}
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// Standard locations
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if let Some(home) = std::env::var_os("HOME") {
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let p = std::path::PathBuf::from(home).join(".config/aacs/KEYDB.cfg");
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if p.exists() { return Some(p); }
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}
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let p = std::path::PathBuf::from("/etc/aacs/KEYDB.cfg");
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if p.exists() { return Some(p); }
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None
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}
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}
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impl Disc {
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/// Disc capacity in GB
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pub fn capacity_gb(&self) -> f64 {
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self.capacity_sectors as f64 * 2048.0 / (1024.0 * 1024.0 * 1024.0)
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}
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/// Scan a disc — parse filesystem, playlists, streams, and set up AACS decryption.
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///
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/// This is the main entry point. After scan(), the Disc is ready:
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/// - titles are populated with streams
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/// - AACS keys are derived (if KEYDB available)
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/// - content can be read and decrypted transparently
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///
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/// ```no_run
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/// use libfreemkv::{DriveSession, Disc};
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/// use libfreemkv::disc::ScanOptions;
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/// use std::path::Path;
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///
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/// let mut session = DriveSession::open(Path::new("/dev/sr0")).unwrap();
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/// let disc = Disc::scan(&mut session, &ScanOptions::default()).unwrap();
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/// for title in &disc.titles {
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/// println!("{} — {} streams", title.duration_display(), title.streams.len());
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/// }
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/// ```
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pub fn scan(session: &mut DriveSession, opts: &ScanOptions) -> Result<Self> {
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// Step 1: Read capacity
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let capacity = Self::read_capacity(session)?;
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// Step 2: Parse UDF filesystem
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let udf_fs = udf::read_filesystem(session)?;
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// Step 3: Find and parse MPLS playlists
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let mut titles = Vec::new();
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if let Some(playlist_dir) = udf_fs.find_dir("/BDMV/PLAYLIST") {
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for entry in &playlist_dir.entries {
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if !entry.is_dir && entry.name.to_lowercase().ends_with(".mpls") {
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let path = format!("/BDMV/PLAYLIST/{}", entry.name);
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if let Ok(mpls_data) = udf_fs.read_file(session, &path) {
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if let Some(title) = Self::parse_playlist(session, &udf_fs, &entry.name, &mpls_data) {
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titles.push(title);
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}
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}
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}
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}
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}
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// Sort: longest first
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titles.sort_by(|a, b| b.duration_secs.partial_cmp(&a.duration_secs).unwrap_or(std::cmp::Ordering::Equal));
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// Step 4: Detect AACS encryption
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let encrypted = udf_fs.find_dir("/AACS").is_some()
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|| udf_fs.find_dir("/BDMV/AACS").is_some();
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// Step 5: If encrypted and KEYDB available, authenticate and derive keys
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let aacs = if encrypted {
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if let Some(keydb_path) = opts.resolve_keydb() {
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match Self::setup_aacs(session, &keydb_path) {
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Ok(state) => Some(state),
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Err(_) => None, // keys not found, continue without decryption
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}
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} else {
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None
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}
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} else {
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None
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};
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Ok(Disc {
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capacity_sectors: capacity,
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titles,
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aacs,
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encrypted,
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})
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}
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/// Set up AACS decryption for this disc.
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/// Call after scan() to enable transparent content decryption.
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pub fn setup_aacs(
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session: &mut DriveSession,
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keydb_path: &std::path::Path,
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) -> Result<AacsState> {
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use crate::aacs::{KeyDb, derive_vuk, decrypt_unit_key};
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use crate::aacs_handshake;
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// Load KEYDB
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let keydb = KeyDb::load(keydb_path).map_err(|e| Error::AacsError {
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detail: format!("failed to load KEYDB: {}", e),
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})?;
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let host_cert = keydb.host_cert.as_ref().ok_or_else(|| Error::AacsError {
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detail: "no host certificate in KEYDB".into(),
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})?;
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// Authenticate with drive
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let mut auth = aacs_handshake::aacs_authenticate(
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session,
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&host_cert.private_key,
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&host_cert.certificate,
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)?;
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// Read Volume ID
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let vid = aacs_handshake::read_volume_id(session, &mut auth)?;
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// Try to read data keys (AACS 2.0)
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let (read_data_key, bus_encryption) = match aacs_handshake::read_data_keys(session, &mut auth) {
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Ok((rdk, _wdk)) => (Some(rdk), true),
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Err(_) => (None, false),
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};
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// Compute disc hash (SHA1 of Unit_Key_RO.inf) for KEYDB lookup
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// First try: look up by VID-derived entries
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// The KEYDB has entries indexed by disc_hash, but we can also
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// find entries that match our MK+VID combination
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// Try all entries — find one whose MK+VID produces a VUK that decrypts unit keys
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let mut found_vuk = None;
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// First: try entries that have a disc_id matching our VID
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for entry in keydb.disc_entries.values() {
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if let (Some(mk), Some(did)) = (entry.media_key, entry.disc_id) {
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if did == vid {
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let vuk = derive_vuk(&mk, &vid);
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found_vuk = Some((vuk, entry.unit_keys.clone()));
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break;
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}
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}
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}
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// Fallback: if we have a VUK that works, use it
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if found_vuk.is_none() {
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for entry in keydb.disc_entries.values() {
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if let Some(vuk) = entry.vuk {
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if let (Some(mk), Some(did)) = (entry.media_key, entry.disc_id) {
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if did == vid {
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found_vuk = Some((vuk, entry.unit_keys.clone()));
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break;
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}
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}
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}
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}
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}
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let (vuk, keydb_unit_keys) = found_vuk.ok_or_else(|| Error::AacsError {
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detail: format!("no matching disc found in KEYDB for VID {:02x?}", &vid[..4]),
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})?;
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// If KEYDB has pre-decrypted unit keys, use them directly
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// Otherwise we'd need to read Unit_Key_RO.inf and decrypt with VUK
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let unit_keys = if !keydb_unit_keys.is_empty() {
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keydb_unit_keys
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} else {
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// Would need to read AACS/Unit_Key_RO.inf from disc and decrypt
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// For now, require KEYDB to have unit keys
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return Err(Error::AacsError {
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detail: "no unit keys in KEYDB entry — Unit_Key_RO.inf parsing not yet implemented".into(),
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});
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};
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Ok(AacsState {
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vuk,
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unit_keys,
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read_data_key,
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bus_encryption,
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})
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}
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// ── Internal helpers ────────────────────────────────────────────────────
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fn read_capacity(session: &mut DriveSession) -> Result<u32> {
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let cdb = [0x25, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00];
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let mut buf = [0u8; 8];
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session.scsi_execute(&cdb, crate::scsi::DataDirection::FromDevice, &mut buf, 5_000)?;
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let lba = u32::from_be_bytes([buf[0], buf[1], buf[2], buf[3]]);
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Ok(lba + 1)
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}
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fn parse_playlist(
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session: &mut DriveSession,
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udf_fs: &udf::UdfFs,
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filename: &str,
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data: &[u8],
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) -> Option<Title> {
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let parsed = mpls::parse(data).ok()?;
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// Calculate duration from play items
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let duration_ticks: u64 = parsed.play_items.iter()
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.map(|pi| (pi.out_time.saturating_sub(pi.in_time)) as u64)
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.sum();
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let duration_secs = duration_ticks as f64 / 45000.0;
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// Skip very short playlists (< 30 seconds)
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if duration_secs < 30.0 {
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return None;
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}
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// Parse each clip for EP map → sector extents
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let mut extents = Vec::new();
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let mut total_size: u64 = 0;
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let clip_count = parsed.play_items.len();
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for play_item in &parsed.play_items {
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let clpi_path = format!("/BDMV/CLIPINF/{}.clpi", play_item.clip_id);
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if let Ok(clpi_data) = udf_fs.read_file(session, &clpi_path) {
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if let Ok(clip_info) = clpi::parse(&clpi_data) {
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// Use EP map to get sector extents for this clip's time range
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let clip_extents = clip_info.get_extents(play_item.in_time, play_item.out_time);
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for ext in &clip_extents {
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total_size += ext.sector_count as u64 * 2048;
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}
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extents.extend(clip_extents);
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}
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}
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}
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// Streams: for now, we know the count but not details
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// (STN table parsing will be added to mpls module)
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let streams = Vec::new();
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let playlist_num = filename.trim_end_matches(".mpls").trim_end_matches(".MPLS");
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let playlist_id = playlist_num.parse::<u16>().unwrap_or(0);
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Some(Title {
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playlist: filename.to_string(),
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playlist_id,
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duration_secs,
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size_bytes: total_size,
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clip_count,
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streams,
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extents,
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})
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}
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}
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// ─── Decrypted reader ──────────────────────────────────────────────────────
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/// A reader that reads m2ts content, decrypting transparently if needed.
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pub struct ContentReader<'a> {
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session: &'a mut DriveSession,
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aacs: Option<&'a AacsState>,
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extents: Vec<Extent>,
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current_extent: usize,
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current_offset: u32, // sectors into current extent
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unit_key_idx: usize,
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}
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impl Disc {
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/// Open a title for reading. Decryption is automatic — if the disc
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/// is encrypted and keys were found during scan(), content is decrypted
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/// on the fly. Unencrypted discs pass through unchanged.
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///
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/// ```no_run
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/// # use libfreemkv::{DriveSession, Disc};
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/// # use libfreemkv::disc::ScanOptions;
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/// # use std::path::Path;
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/// # let mut session = DriveSession::open(Path::new("/dev/sr0")).unwrap();
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/// let disc = Disc::scan(&mut session, &ScanOptions::default()).unwrap();
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/// let mut reader = disc.open_title(&mut session, 0).unwrap();
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/// while let Some(unit) = reader.read_unit().unwrap() {
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/// // unit is 6144 bytes of decrypted content
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/// }
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/// ```
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pub fn open_title<'a>(&'a self, session: &'a mut DriveSession, title_idx: usize) -> Result<ContentReader<'a>> {
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let title = self.titles.get(title_idx).ok_or_else(|| Error::DiscError {
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detail: format!("title index {} out of range (have {})", title_idx, self.titles.len()),
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})?;
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Ok(ContentReader {
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session,
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aacs: self.aacs.as_ref(),
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extents: title.extents.clone(),
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current_extent: 0,
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current_offset: 0,
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unit_key_idx: 0,
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})
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}
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}
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impl<'a> ContentReader<'a> {
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/// Read the next aligned unit (6144 bytes).
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/// Automatically decrypted if AACS keys are available.
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/// Returns None when all extents are exhausted.
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pub fn read_unit(&mut self) -> Result<Option<Vec<u8>>> {
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if self.current_extent >= self.extents.len() {
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return Ok(None);
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}
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let extent = &self.extents[self.current_extent];
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let lba = extent.start_lba + self.current_offset;
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// Read 3 sectors (one aligned unit)
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let mut unit = vec![0u8; crate::aacs::ALIGNED_UNIT_LEN];
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for i in 0..3u32 {
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let offset = (i as usize) * 2048;
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let mut sector = [0u8; 2048];
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session_read_sector(self.session, lba + i, &mut sector)?;
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unit[offset..offset + 2048].copy_from_slice(§or);
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}
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// Decrypt if needed
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if let Some(aacs) = &self.aacs {
|
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if crate::aacs::is_unit_encrypted(&unit) {
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let uk = aacs.unit_keys.get(self.unit_key_idx)
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.map(|(_, k)| *k)
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.unwrap_or([0u8; 16]);
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|
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crate::aacs::decrypt_unit_full(
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&mut unit,
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&uk,
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aacs.read_data_key.as_ref(),
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||||
);
|
||||
}
|
||||
}
|
||||
|
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// Advance position
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self.current_offset += 3;
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if self.current_offset >= extent.sector_count {
|
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self.current_extent += 1;
|
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self.current_offset = 0;
|
||||
}
|
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|
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Ok(Some(unit))
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}
|
||||
}
|
||||
|
||||
fn session_read_sector(session: &mut DriveSession, lba: u32, buf: &mut [u8; 2048]) -> Result<()> {
|
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let cdb = [
|
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0x28, 0x00,
|
||||
(lba >> 24) as u8, (lba >> 16) as u8, (lba >> 8) as u8, lba as u8,
|
||||
0x00, 0x00, 0x01, 0x00,
|
||||
];
|
||||
session.scsi_execute(&cdb, crate::scsi::DataDirection::FromDevice, buf, 10_000)?;
|
||||
Ok(())
|
||||
}
|
||||
|
||||
// ─── Format helpers ────────────────────────────────────────────────────────
|
||||
|
||||
fn format_resolution(video_format: u8, _video_rate: u8) -> String {
|
||||
match video_format {
|
||||
1 => "480i".into(),
|
||||
2 => "576i".into(),
|
||||
3 => "480p".into(),
|
||||
4 => "1080i".into(),
|
||||
5 => "720p".into(),
|
||||
6 => "1080p".into(),
|
||||
7 => "576p".into(),
|
||||
8 => "2160p".into(),
|
||||
_ => String::new(),
|
||||
}
|
||||
}
|
||||
|
||||
fn format_framerate(video_rate: u8) -> String {
|
||||
match video_rate {
|
||||
1 => "23.976".into(),
|
||||
2 => "24".into(),
|
||||
3 => "25".into(),
|
||||
4 => "29.97".into(),
|
||||
6 => "50".into(),
|
||||
7 => "59.94".into(),
|
||||
_ => String::new(),
|
||||
}
|
||||
}
|
||||
|
||||
fn format_channels(audio_format: u8) -> String {
|
||||
match audio_format {
|
||||
1 => "mono".into(),
|
||||
3 => "stereo".into(),
|
||||
6 => "5.1".into(),
|
||||
12 => "7.1".into(),
|
||||
_ if audio_format > 0 => format!("{}ch", audio_format),
|
||||
_ => String::new(),
|
||||
}
|
||||
}
|
||||
|
||||
fn format_samplerate(audio_rate: u8) -> String {
|
||||
match audio_rate {
|
||||
1 => "48kHz".into(),
|
||||
4 => "96kHz".into(),
|
||||
5 => "192kHz".into(),
|
||||
12 => "48/192kHz".into(),
|
||||
14 => "48/96kHz".into(),
|
||||
_ => String::new(),
|
||||
}
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user