Refactor init into modules, and implement simple/working entropy seeding
This commit is contained in:
parent
70161ec6fe
commit
7e8eda88f7
GPG Key ID:
8E47A1EC35A1551D
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@ -0,0 +1,12 @@
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[package]
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name = "aws"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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libc = "0.2.134"
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nsm_lib = { git = "https://github.com/aws/aws-nitro-enclaves-nsm-api.git/", branch = "main", package="nsm-lib", optional = false }
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nsm_api = { git = "https://github.com/aws/aws-nitro-enclaves-nsm-api.git/", branch = "main", package="aws-nitro-enclaves-nsm-api", optional = false }
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system = { path = "../system"}
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@ -0,0 +1,65 @@
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use system::{dmesg, SystemError};
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// Signal to Nitro hypervisor that booting was successful
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fn nitro_heartbeat() {
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use system::socket_connect;
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use libc::{write, read, close, AF_VSOCK};
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let mut buf: [u8; 1] = [0; 1];
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buf[0] = 0xB7; // AWS Nitro heartbeat value
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let fd = match socket_connect(AF_VSOCK, 9000, 3) {
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Ok(f)=> f,
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Err(e)=> {
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eprintln!("{}", e);
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return
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},
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};
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unsafe {
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write(fd, buf.as_ptr() as _, 1);
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read(fd, buf.as_ptr() as _, 1);
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close(fd);
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}
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dmesg(format!("Sent NSM heartbeat"));
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}
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// Get entropy sample from Nitro device
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pub fn get_entropy(size: usize) -> Result<Vec<u8>, SystemError> {
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use nsm_api::api::ErrorCode;
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use nsm_lib::{nsm_get_random, nsm_lib_init};
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let nsm_fd = nsm_lib_init();
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if nsm_fd < 0 {
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return Err(SystemError {
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message: String::from("Failed to connect to NSM device")
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});
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};
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let mut dest = Vec::with_capacity(size);
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while dest.len() < size {
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let mut buf = [0u8; 256];
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let mut buf_len = buf.len();
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let status = unsafe {
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nsm_get_random(nsm_fd, buf.as_mut_ptr(), &mut buf_len)
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};
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match status {
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ErrorCode::Success => {
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dest.extend_from_slice(&buf);
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},
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_ => {
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return Err(SystemError {
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message: String::from("Failed to get entropy from NSM device")
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});
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}
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};
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}
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Ok(dest)
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}
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// Initialize nitro device
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pub fn init_platform(){
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use system::insmod;
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// TODO: error handling
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nitro_heartbeat();
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match insmod("/nsm.ko") {
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Ok(())=> dmesg(format!("Loaded nsm.ko")),
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Err(e)=> eprintln!("{}", e)
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};
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}
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@ -8,6 +8,16 @@ version = "1.1.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
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[[package]]
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name = "aws"
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version = "0.1.0"
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dependencies = [
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"aws-nitro-enclaves-nsm-api",
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"libc",
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"nsm-lib",
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"system",
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]
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[[package]]
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name = "aws-nitro-enclaves-nsm-api"
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version = "0.2.1"
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@ -98,9 +108,9 @@ dependencies = [
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name = "init"
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version = "0.1.0"
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dependencies = [
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"aws-nitro-enclaves-nsm-api",
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"aws",
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"libc",
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"nsm-lib",
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"system",
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]
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[[package]]
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@ -268,6 +278,13 @@ dependencies = [
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"unicode-ident",
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]
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[[package]]
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name = "system"
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version = "0.1.0"
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dependencies = [
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"libc",
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]
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[[package]]
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name = "tempfile"
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version = "3.3.0"
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@ -5,8 +5,8 @@ edition = "2021"
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[dependencies]
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libc = "0.2.134"
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nsm_lib = { git = "https://github.com/aws/aws-nitro-enclaves-nsm-api.git/", branch = "main", package="nsm-lib", optional = false }
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nsm_api = { git = "https://github.com/aws/aws-nitro-enclaves-nsm-api.git/", branch = "main", package="aws-nitro-enclaves-nsm-api", optional = false }
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aws = { path = "../aws"}
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system = { path = "../system"}
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[[bin]]
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268
src/init/init.rs
268
src/init/init.rs
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@ -1,223 +1,32 @@
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use libc::{
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c_ulong,
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c_int,
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c_void,
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MS_NOSUID,
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MS_NOEXEC,
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MS_NODEV,
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};
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use std::{
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mem::zeroed,
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mem::size_of,
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ffi::CString,
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fs::{File, read_to_string},
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os::unix::io::AsRawFd,
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fmt,
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};
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use system::{seed_entropy, reboot, freopen, mount, dmesg};
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struct SystemError {
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message: String,
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}
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impl fmt::Display for SystemError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{} {}", boot_time(), self.message)
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//TODO: Feature flag
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use aws::{init_platform, get_entropy};
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// Mount common filesystems with conservative permissions
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fn init_rootfs() {
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use libc::{MS_NOSUID, MS_NOEXEC, MS_NODEV };
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let no_dse = MS_NODEV | MS_NOSUID | MS_NOEXEC;
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let no_se = MS_NOSUID | MS_NOEXEC;
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let args = [
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("devtmpfs", "/dev", "devtmpfs", no_se, "mode=0755"),
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("devtmpfs", "/dev", "devtmpfs", no_se, "mode=0755"),
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("devpts", "/dev/pts", "devpts", no_se, ""),
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("shm", "/dev/shm", "tmpfs", no_dse, "mode=0755"),
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("proc", "/proc", "proc", no_dse, "hidepid=2"),
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("tmpfs", "/run", "tmpfs", no_dse, "mode=0755"),
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("tmpfs", "/tmp", "tmpfs", no_dse, ""),
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("sysfs", "/sys", "sysfs", no_dse, ""),
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("cgroup_root", "/sys/fs/cgroup", "tmpfs", no_dse, "mode=0755"),
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];
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for (src, target, fstype, flags, data) in args {
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match mount(src, target, fstype, flags, data) {
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Ok(())=> dmesg(format!("Mounted {}", target)),
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Err(e)=> eprintln!("{}", e),
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}
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}
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}
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// Log dmesg formatted log to console
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fn dmesg(message: String){
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println!("{} {}", boot_time(), message);
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}
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// Dmesg formatted seconds since boot
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fn boot_time() -> String {
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use libc::{clock_gettime, timespec, CLOCK_BOOTTIME};
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let mut t = timespec { tv_sec: 0, tv_nsec: 0 };
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unsafe { clock_gettime(CLOCK_BOOTTIME, &mut t as *mut timespec); }
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format!("[ {: >4}.{}]", t.tv_sec, t.tv_nsec / 1000).to_string()
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}
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fn reboot(){
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use libc::{reboot, RB_AUTOBOOT};
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unsafe {
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reboot(RB_AUTOBOOT);
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}
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}
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// libc::mount casting/error wrapper
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fn mount(
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src: &str,
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target: &str,
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fstype: &str,
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flags: c_ulong,
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data: &str,
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) -> Result<(), SystemError> {
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use libc::mount;
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let src_cs = CString::new(src).unwrap();
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let fstype_cs = CString::new(fstype).unwrap();
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let data_cs = CString::new(data).unwrap();
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let target_cs = CString::new(target).unwrap();
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if unsafe {
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mount(
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src_cs.as_ptr(),
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target_cs.as_ptr(),
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fstype_cs.as_ptr(),
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flags,
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data_cs.as_ptr() as *const c_void
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)
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} != 0 {
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Err(SystemError { message: format!("Failed to mount: {}", target) })
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} else {
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Ok(())
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}
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}
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// libc::freopen casting/error wrapper
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fn freopen(
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filename: &str,
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mode: &str,
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file: c_int,
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) -> Result<(), SystemError> {
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use libc::{freopen, fdopen};
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let filename_cs = CString::new(filename).unwrap();
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let mode_cs = CString::new(mode).unwrap();
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if unsafe {
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freopen(
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filename_cs.as_ptr(),
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mode_cs.as_ptr(),
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fdopen(file, mode_cs.as_ptr() as *const i8)
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)
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}.is_null() {
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Err(SystemError { message: format!("Failed to freopen: {}", filename) })
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} else {
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Ok(())
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}
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}
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// Insert kernel module into memory
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fn insmod(path: &str) -> Result<(), SystemError> {
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use libc::{syscall, SYS_finit_module};
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let file = File::open(path).unwrap();
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let fd = file.as_raw_fd();
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if unsafe { syscall(SYS_finit_module, fd, &[0u8; 1], 0) } < 0 {
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Err(SystemError {
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message: format!("Failed to insert kernel module: {}", path)
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})
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} else {
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Ok(())
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}
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}
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// Instantiate a socket
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fn socket_connect(
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family: c_int,
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port: u32,
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cid: u32,
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) -> Result<c_int, SystemError> {
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use libc::{connect, socket, sockaddr, sockaddr_vm, SOCK_STREAM};
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let fd = unsafe { socket(family, SOCK_STREAM, 0) };
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if unsafe {
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let mut sa: sockaddr_vm = zeroed();
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sa.svm_family = family as _;
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sa.svm_port = port;
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sa.svm_cid = cid;
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connect(
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fd,
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&sa as *const _ as *mut sockaddr,
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size_of::<sockaddr_vm>() as _,
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)
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} < 0 {
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Err(SystemError {
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message: format!("Failed to connect to socket: {}", family)
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})
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} else {
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Ok(fd)
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}
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}
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// Signal to Nitro hypervisor that booting was successful
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fn nitro_heartbeat() {
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use libc::{write, read, close, AF_VSOCK};
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let mut buf: [u8; 1] = [0; 1];
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buf[0] = 0xB7; // AWS Nitro heartbeat value
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let fd = match socket_connect(AF_VSOCK, 9000, 3) {
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Ok(f)=> f,
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Err(e)=> {
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eprintln!("{}", e);
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return
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},
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};
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unsafe {
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write(fd, buf.as_ptr() as _, 1);
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read(fd, buf.as_ptr() as _, 1);
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close(fd);
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}
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dmesg(format!("Sent NSM heartbeat"));
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}
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// Get entropy sample from Nitro device
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fn nitro_get_entropy() -> Result<[u8; 256], SystemError> {
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use nsm_api::api::ErrorCode;
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use nsm_lib::{nsm_get_random, nsm_lib_init};
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let nsm_fd = nsm_lib_init();
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if nsm_fd < 0 {
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return Err(SystemError {
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message: String::from("Failed to connect to NSM device")
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});
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};
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let mut dest = [0u8; 256];
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let mut dest_len = dest.len();
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let status = unsafe {
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nsm_get_random(nsm_fd, dest.as_mut_ptr(), &mut dest_len)
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};
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match status {
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ErrorCode::Success => {
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Ok(dest)
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},
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_ => Err(SystemError {
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message: String::from("Failed to get entropy from NSM device")
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})
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}
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}
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fn get_random_poolsize() -> Result<usize, SystemError> {
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let ps_path = "/proc/sys/kernel/random/poolsize";
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let size_s = read_to_string(ps_path).unwrap_or_else(|_| String::new());
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if size_s.is_empty(){
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return Err(SystemError {
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message: String::from("Failed to read kernel random poolsize"),
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})
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};
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match size_s.parse::<usize>() {
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Ok(size) => Ok(size),
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Err(_) => Err(SystemError {
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message: String::from("Failed to parse kernel random poolsize"),
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}),
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}
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}
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// Initialize nitro device
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fn init_nitro(){
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// TODO: error handling
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nitro_heartbeat();
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match insmod("/nsm.ko") {
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Ok(())=> dmesg(format!("Loaded nsm.ko")),
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Err(e)=> eprintln!("{}", e)
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};
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match get_random_poolsize() {
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Ok(size)=> dmesg(format!("Kernel entropy pool size: {}", size)),
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Err(e)=> eprintln!("{}", e)
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};
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match nitro_get_entropy() {
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Ok(_)=> dmesg(format!("Got NSM Entropy sample")),
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Err(e)=> eprintln!("{}", e)
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};
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}
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// Initialize console with stdin/stdout/stderr
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fn init_console() {
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let args = [
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@ -233,31 +42,14 @@ fn init_console() {
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}
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}
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// Mount common filesystems with conservative permissions
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fn init_rootfs() {
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let args = [
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("devtmpfs", "/dev", "devtmpfs", MS_NOSUID | MS_NOEXEC, "mode=0755"),
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("devtmpfs", "/dev", "devtmpfs", MS_NOSUID | MS_NOEXEC, "mode=0755"),
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("proc", "/proc", "proc", MS_NODEV | MS_NOSUID | MS_NOEXEC, "hidepid=2"),
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("tmpfs", "/run", "tmpfs", MS_NODEV | MS_NOSUID | MS_NOEXEC, "mode=0755"),
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("tmpfs", "/tmp", "tmpfs", MS_NODEV | MS_NOSUID | MS_NOEXEC, ""),
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("shm", "/dev/shm", "tmpfs", MS_NODEV | MS_NOSUID | MS_NOEXEC, "mode=0755"),
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("devpts", "/dev/pts", "devpts", MS_NOSUID | MS_NOEXEC, ""),
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("sysfs", "/sys", "sysfs", MS_NODEV | MS_NOSUID | MS_NOEXEC, ""),
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("cgroup_root", "/sys/fs/cgroup", "tmpfs", MS_NODEV | MS_NOSUID | MS_NOEXEC, "mode=0755"),
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];
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for (src, target, fstype, flags, data) in args {
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match mount(src, target, fstype, flags, data) {
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Ok(())=> dmesg(format!("Mounted {}", target)),
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Err(e)=> eprintln!("{}", e),
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}
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}
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}
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fn boot(){
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init_rootfs();
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init_console();
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init_nitro();
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init_platform();
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match seed_entropy(4096, get_entropy) {
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Ok(size)=> dmesg(format!("Seeded kernel with entropy: {}", size)),
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Err(e)=> eprintln!("{}", e)
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};
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}
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fn main() {
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|
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|
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@ -0,0 +1,9 @@
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[package]
|
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name = "system"
|
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version = "0.1.0"
|
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edition = "2021"
|
||||
|
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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|
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[dependencies]
|
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libc = "0.2.134"
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|
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@ -0,0 +1,169 @@
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use libc::{ c_ulong, c_int, c_void };
|
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use std::{
|
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mem::{zeroed, size_of},
|
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ffi::CString,
|
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fs::File,
|
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os::unix::io::AsRawFd,
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fmt,
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};
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|
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pub struct SystemError {
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pub message: String,
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}
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impl fmt::Display for SystemError {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "{} {}", boot_time(), self.message)
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}
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}
|
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|
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// Log dmesg formatted log to console
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pub fn dmesg(message: String){
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println!("{} {}", boot_time(), message);
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}
|
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|
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// Dmesg formatted seconds since boot
|
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pub fn boot_time() -> String {
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use libc::{clock_gettime, timespec, CLOCK_BOOTTIME};
|
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let mut t = timespec { tv_sec: 0, tv_nsec: 0 };
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unsafe { clock_gettime(CLOCK_BOOTTIME, &mut t as *mut timespec); }
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format!("[ {: >4}.{}]", t.tv_sec, t.tv_nsec / 1000).to_string()
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}
|
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|
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// Unconditionally reboot the system now
|
||||
pub fn reboot(){
|
||||
use libc::{reboot, RB_AUTOBOOT};
|
||||
unsafe {
|
||||
reboot(RB_AUTOBOOT);
|
||||
}
|
||||
}
|
||||
|
||||
// libc::mount casting/error wrapper
|
||||
pub fn mount(
|
||||
src: &str,
|
||||
target: &str,
|
||||
fstype: &str,
|
||||
flags: c_ulong,
|
||||
data: &str,
|
||||
) -> Result<(), SystemError> {
|
||||
use libc::mount;
|
||||
let src_cs = CString::new(src).unwrap();
|
||||
let fstype_cs = CString::new(fstype).unwrap();
|
||||
let data_cs = CString::new(data).unwrap();
|
||||
let target_cs = CString::new(target).unwrap();
|
||||
if unsafe {
|
||||
mount(
|
||||
src_cs.as_ptr(),
|
||||
target_cs.as_ptr(),
|
||||
fstype_cs.as_ptr(),
|
||||
flags,
|
||||
data_cs.as_ptr() as *const c_void
|
||||
)
|
||||
} != 0 {
|
||||
Err(SystemError { message: format!("Failed to mount: {}", target) })
|
||||
} else {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
// libc::freopen casting/error wrapper
|
||||
pub fn freopen(
|
||||
filename: &str,
|
||||
mode: &str,
|
||||
file: c_int,
|
||||
) -> Result<(), SystemError> {
|
||||
use libc::{freopen, fdopen};
|
||||
let filename_cs = CString::new(filename).unwrap();
|
||||
let mode_cs = CString::new(mode).unwrap();
|
||||
if unsafe {
|
||||
freopen(
|
||||
filename_cs.as_ptr(),
|
||||
mode_cs.as_ptr(),
|
||||
fdopen(file, mode_cs.as_ptr() as *const i8)
|
||||
)
|
||||
}.is_null() {
|
||||
Err(SystemError { message: format!("Failed to freopen: {}", filename) })
|
||||
} else {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
// Insert kernel module into memory
|
||||
pub fn insmod(path: &str) -> Result<(), SystemError> {
|
||||
use libc::{syscall, SYS_finit_module};
|
||||
let file = File::open(path).unwrap();
|
||||
let fd = file.as_raw_fd();
|
||||
if unsafe { syscall(SYS_finit_module, fd, &[0u8; 1], 0) } < 0 {
|
||||
Err(SystemError {
|
||||
message: format!("Failed to insert kernel module: {}", path)
|
||||
})
|
||||
} else {
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
// Instantiate a socket
|
||||
pub fn socket_connect(
|
||||
family: c_int,
|
||||
port: u32,
|
||||
cid: u32,
|
||||
) -> Result<c_int, SystemError> {
|
||||
use libc::{connect, socket, sockaddr, sockaddr_vm, SOCK_STREAM};
|
||||
let fd = unsafe { socket(family, SOCK_STREAM, 0) };
|
||||
if unsafe {
|
||||
let mut sa: sockaddr_vm = zeroed();
|
||||
sa.svm_family = family as _;
|
||||
sa.svm_port = port;
|
||||
sa.svm_cid = cid;
|
||||
connect(
|
||||
fd,
|
||||
&sa as *const _ as *mut sockaddr,
|
||||
size_of::<sockaddr_vm>() as _,
|
||||
)
|
||||
} < 0 {
|
||||
Err(SystemError {
|
||||
message: format!("Failed to connect to socket: {}", family)
|
||||
})
|
||||
} else {
|
||||
Ok(fd)
|
||||
}
|
||||
}
|
||||
|
||||
// Seed an entropy sample into the kernel randomness pool.
|
||||
pub fn seed_entropy(
|
||||
size: usize,
|
||||
source: fn(usize) -> Result<Vec<u8>, SystemError>,
|
||||
) -> Result<usize, SystemError> {
|
||||
use std::io::Write;
|
||||
|
||||
let entropy_sample = match source(size) {
|
||||
Ok(sample)=> sample,
|
||||
Err(e)=> { return Err(e) },
|
||||
};
|
||||
|
||||
use std::fs::OpenOptions;
|
||||
let mut random_fd = match OpenOptions::new()
|
||||
.read(true)
|
||||
.write(true)
|
||||
.open("/dev/urandom")
|
||||
{
|
||||
Ok(file) => file,
|
||||
Err(_) => {
|
||||
return Err(SystemError {
|
||||
message: String::from("Failed to open /dev/urandom"),
|
||||
});
|
||||
},
|
||||
};
|
||||
|
||||
// 5.10+ kernel entropy pools are made of BLAKE2 hashes fixed at 256 bit
|
||||
// The RNDADDENTROPY crediting system is now complexity with no gain.
|
||||
// We just simply write samples to /dev/urandom now.
|
||||
// See: https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.119
|
||||
match random_fd.write_all(&entropy_sample) {
|
||||
Ok(()) => Ok(entropy_sample.len()),
|
||||
Err(_) => {
|
||||
return Err(SystemError {
|
||||
message: String::from("Failed to write to /dev/urandom"),
|
||||
});
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue