mirror of https://github.com/ospab/ostp.git
security: fix obfuscation via HMAC per-packet mask and cap server sessions at 1024
This commit is contained in:
ospab
parent
6e35609f42
commit
77b0d55f39
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@ -356,6 +356,15 @@ version = "0.5.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
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[[package]]
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name = "hmac"
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version = "0.12.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "6c49c37c09c17a53d937dfbb742eb3a961d65a994e6bcdcf37e7399d0cc8ab5e"
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dependencies = [
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"digest",
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]
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[[package]]
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name = "inout"
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version = "0.1.4"
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@ -512,6 +521,7 @@ dependencies = [
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"async-trait",
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"bytes",
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"chacha20poly1305",
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"hmac",
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"rand",
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"sha2",
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"snow",
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@ -25,4 +25,5 @@ tokio = { version = "1.37", features = ["rt-multi-thread", "macros", "net", "tim
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tracing = "0.1"
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x25519-dalek = "2"
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sha2 = "0.10"
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hmac = "0.12"
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portable-atomic = "1.10"
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@ -15,3 +15,4 @@ thiserror.workspace = true
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tracing.workspace = true
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x25519-dalek.workspace = true
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sha2.workspace = true
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hmac.workspace = true
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@ -1,6 +1,9 @@
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use sha2::{Digest, Sha256};
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use sha2::Sha256;
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use hmac::{Hmac, Mac};
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type HmacSha256 = Hmac<Sha256>;
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pub fn derive_obfuscation_key(access_key: &[u8]) -> [u8; 8] {
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use sha2::Digest;
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let mut hasher = Sha256::new();
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hasher.update(access_key);
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let result = hasher.finalize();
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@ -10,6 +13,7 @@ pub fn derive_obfuscation_key(access_key: &[u8]) -> [u8; 8] {
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}
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pub fn derive_psk(access_key: &[u8]) -> [u8; 32] {
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use sha2::Digest;
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let mut hasher = Sha256::new();
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hasher.update(access_key);
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hasher.update(b"-ostp-psk-salt");
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@ -19,72 +23,66 @@ pub fn derive_psk(access_key: &[u8]) -> [u8; 32] {
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psk
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}
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/// Derives a unique 4-byte session_id mask using HMAC-SHA256(key, nonce).
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/// Because nonce is strictly monotonic, each packet gets a cryptographically
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/// independent mask — consecutive headers are indistinguishable from random noise.
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fn derive_session_mask(key: &[u8; 8], nonce: u64) -> [u8; 4] {
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let mut mac = HmacSha256::new_from_slice(key).expect("HMAC accepts any key length");
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mac.update(&nonce.to_be_bytes());
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let result = mac.finalize().into_bytes();
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let mut mask = [0u8; 4];
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mask.copy_from_slice(&result[..4]);
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mask
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}
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/// Wire layout for DATA packets:
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/// [0..4] = session_id XOR HMAC(obf_key, nonce)[0..4] ← masked, unique per-packet
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/// [4..12] = nonce, plaintext ← needed by receiver to derive mask
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/// [12..] = AEAD ciphertext ← authenticates everything
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///
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/// The nonce is sent in plaintext but this is intentional and safe:
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/// - It is authenticated by the AEAD tag; tampering is detected.
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/// - The session_id mask changes with every packet, breaking header correlation.
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/// - The ciphertext is fully opaque; only nonce sequence is visible.
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pub fn obfuscate_packet_inplace(raw: &mut [u8], key: &[u8; 8], is_handshake: bool) {
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if !is_handshake && raw.len() >= 12 {
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// Data packet
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let mut session_id_bytes = [raw[0], raw[1], raw[2], raw[3]];
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let mut nonce_bytes = [
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// Read nonce from bytes 4..12 (plaintext on wire)
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let nonce = u64::from_be_bytes([
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raw[4], raw[5], raw[6], raw[7],
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raw[8], raw[9], raw[10], raw[11]
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];
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// 1. Obfuscate nonce with derived key
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for i in 0..8 {
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nonce_bytes[i] ^= key[i];
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}
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// 2. Obfuscate session_id with the REAL (unobfuscated) nonce
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let real_nonce = u64::from_be_bytes([
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raw[4], raw[5], raw[6], raw[7],
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raw[8], raw[9], raw[10], raw[11]
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raw[8], raw[9], raw[10], raw[11],
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]);
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let nonce_low_32 = (real_nonce & 0xFFFFFFFF) as u32;
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let nonce_low_bytes = nonce_low_32.to_be_bytes();
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// Mask only session_id bytes using nonce-derived mask
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let mask = derive_session_mask(key, nonce);
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for i in 0..4 {
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session_id_bytes[i] ^= nonce_low_bytes[i];
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raw[i] ^= mask[i];
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}
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// Put them back
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raw[0..4].copy_from_slice(&session_id_bytes);
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raw[4..12].copy_from_slice(&nonce_bytes);
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// nonce bytes 4..12 remain as-is (plaintext, authenticated by AEAD)
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} else if raw.len() >= 4 {
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// Handshake packet (XOR with key)
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// Handshake packets: mask session_id with a fixed handshake-phase mask
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// u64::MAX used as sentinel to produce a distinct HMAC output from any data nonce
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let mask = derive_session_mask(key, u64::MAX);
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for i in 0..4 {
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raw[i] ^= key[i % 8];
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raw[i] ^= mask[i];
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}
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}
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}
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pub fn deobfuscate_packet_inplace(raw: &mut [u8], key: &[u8; 8], is_handshake: bool) {
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if !is_handshake && raw.len() >= 12 {
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// Data packet
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let mut nonce_bytes = [
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// Read nonce plaintext from bytes 4..12
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let nonce = u64::from_be_bytes([
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raw[4], raw[5], raw[6], raw[7],
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raw[8], raw[9], raw[10], raw[11]
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];
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// 1. Recover real nonce by XORing with key
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for i in 0..8 {
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nonce_bytes[i] ^= key[i];
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}
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let real_nonce = u64::from_be_bytes(nonce_bytes);
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let nonce_low_32 = (real_nonce & 0xFFFFFFFF) as u32;
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let nonce_low_bytes = nonce_low_32.to_be_bytes();
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// 2. Recover session_id by XORing with recovered nonce
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let mut session_id_bytes = [raw[0], raw[1], raw[2], raw[3]];
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raw[8], raw[9], raw[10], raw[11],
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]);
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// Derive same mask and unmask session_id
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let mask = derive_session_mask(key, nonce);
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for i in 0..4 {
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session_id_bytes[i] ^= nonce_low_bytes[i];
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raw[i] ^= mask[i];
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}
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// Put them back
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raw[0..4].copy_from_slice(&session_id_bytes);
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raw[4..12].copy_from_slice(&nonce_bytes);
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} else if raw.len() >= 4 {
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// Handshake packet
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let mask = derive_session_mask(key, u64::MAX);
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for i in 0..4 {
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raw[i] ^= key[i % 8];
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raw[i] ^= mask[i];
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}
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}
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}
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@ -5,6 +5,10 @@ use std::collections::HashMap;
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use std::net::SocketAddr;
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use std::sync::{Arc, RwLock};
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/// Maximum number of concurrent authenticated sessions.
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/// Excess handshake attempts are silently dropped — no response, no state allocated.
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const MAX_SESSIONS: usize = 1024;
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pub enum DispatchOutcome {
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Unauthorized,
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Accepted {
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@ -198,6 +202,11 @@ impl Dispatcher {
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}
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if !self.replay_cache.contains_key(&payload.to_vec()) {
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// §4 fix: hard cap on concurrent sessions to prevent RAM exhaustion
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if self.peer_machines.len() >= MAX_SESSIONS {
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return Ok(DispatchOutcome::Unauthorized);
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}
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self.replay_cache.insert(payload.to_vec(), ts);
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machine.set_session_keys(candidate_session_id, obf_key);
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@ -0,0 +1 @@
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{"rustc_fingerprint":18383453396593711792,"outputs":{"17747080675513052775":{"success":true,"status":"","code":0,"stdout":"rustc 1.93.0 (254b59607 2026-01-19)\nbinary: rustc\ncommit-hash: 254b59607d4417e9dffbc307138ae5c86280fe4c\ncommit-date: 2026-01-19\nhost: x86_64-unknown-linux-gnu\nrelease: 1.93.0\nLLVM version: 21.1.8\n","stderr":""},"7971740275564407648":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.so\nlib___.so\nlib___.a\nlib___.so\n/home/deb/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"gnu\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":""},"7758962378047318522":{"success":true,"status":"","code":0,"stdout":"___\nlib___.rlib\nlib___.a\nlib___.so\n/home/deb/.rustup/toolchains/stable-x86_64-unknown-linux-gnu\noff\npacked\nunpacked\n___\ndebug_assertions\npanic=\"unwind\"\nproc_macro\ntarget_abi=\"\"\ntarget_arch=\"x86_64\"\ntarget_endian=\"little\"\ntarget_env=\"musl\"\ntarget_family=\"unix\"\ntarget_feature=\"fxsr\"\ntarget_feature=\"sse\"\ntarget_feature=\"sse2\"\ntarget_has_atomic=\"16\"\ntarget_has_atomic=\"32\"\ntarget_has_atomic=\"64\"\ntarget_has_atomic=\"8\"\ntarget_has_atomic=\"ptr\"\ntarget_os=\"linux\"\ntarget_pointer_width=\"64\"\ntarget_vendor=\"unknown\"\nunix\n","stderr":"warning: dropping unsupported crate type `dylib` for target `x86_64-unknown-linux-musl`\n\nwarning: dropping unsupported crate type `cdylib` for target `x86_64-unknown-linux-musl`\n\nwarning: 2 warnings emitted\n\n"}},"successes":{}}
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Reference in New Issue