From b0b6fdf30996a7843558b3477e6ce0309972b97b Mon Sep 17 00:00:00 2001
From: pjht <pterpstra@pterpstra.com>
Date: Mon, 14 Aug 2023 10:04:07 -0500
Subject: [PATCH] Initial commit

---
 .gitignore  |    1 +
 Cargo.lock  | 1498 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   13 +
 src/main.rs |  131 +++++
 4 files changed, 1643 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7dab94a
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,13 @@
+[package]
+name = "fido_ssh_maker"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.72"
+clap = { version = "4.3.21", features = ["derive"] }
+ctap-hid-fido2 = "3.5.0"
+ssh-encoding = { version = "0.1.0" }
+ssh-key = { version = "0.5.0", features = ["ed25519"] }
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c608a49
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,131 @@
+use std::{
+    fs::Permissions,
+    os::unix::prelude::PermissionsExt,
+    path::{Path, PathBuf},
+};
+
+use anyhow::anyhow;
+use clap::{Parser, ValueEnum};
+use ctap_hid_fido2::{
+    fidokey::{CredentialSupportedKeyType, MakeCredentialArgsBuilder},
+    verifier, FidoKeyHidFactory, LibCfg,
+};
+use ssh_encoding::{Decode, Encode, LineEnding};
+use ssh_key::{private, PrivateKey};
+
+/// Generate FIDO-backed SSH keys
+#[derive(Parser, Debug)]
+#[command(author, version, about, long_about = None, arg_required_else_help = true)]
+struct Args {
+    /// SSH key comment
+    #[arg(short = 'c', long, default_value = "")]
+    comment: String,
+    /// Overwrite existing key files
+    #[arg(short = 'f', long)]
+    force: bool,
+    #[arg(short = 't', long = "type")]
+    key_type: KeyTypeArg,
+    #[arg(long = "write-attestation")]
+    write_attestation: bool,
+    /// Name of key to generate
+    key_name: String,
+}
+
+#[derive(ValueEnum, Clone, Copy, Debug)]
+enum KeyTypeArg {
+    Ed25519,
+    Ecdsa,
+}
+
+impl From<KeyTypeArg> for CredentialSupportedKeyType {
+    fn from(value: KeyTypeArg) -> Self {
+        match value {
+            KeyTypeArg::Ed25519 => Self::Ed25519,
+            KeyTypeArg::Ecdsa => Self::Ecdsa256,
+        }
+    }
+}
+
+fn main() -> anyhow::Result<()> {
+    let args = Args::parse();
+
+    let privkey_path = Path::new(&args.key_name);
+    let pubkey_path = PathBuf::from(format!("{}.pub", &args.key_name));
+    let attest_info_path = PathBuf::from(format!("{}_attest.bin", &args.key_name));
+    let attest_challenge_path = PathBuf::from(format!("{}_attest_chall.bin", &args.key_name));
+
+    if !args.force && (privkey_path.exists() || pubkey_path.exists() || args.write_attestation && (attest_info_path.exists() || attest_challenge_path.exists())) {
+        return Err(anyhow!("Key files exist, use -f to overwrite."));
+    }
+
+    let key_type = args.key_type.into();
+
+    match key_type {
+        CredentialSupportedKeyType::Ecdsa256 => {
+            println!("Generating public/private ecdsa-sk key pair.")
+        }
+        CredentialSupportedKeyType::Ed25519 => {
+            println!("Generating public/private ed25519-sk key pair.")
+        }
+    }
+
+    let challenge = verifier::create_challenge();
+    let make_credential_args = MakeCredentialArgsBuilder::new("ssh:", &challenge)
+        .without_pin_and_uv()
+        .key_type(key_type)
+        .build();
+    let mut libcfg = LibCfg::init();
+    libcfg.keep_alive_msg = "Touch the authenticator now.".into();
+    let device = FidoKeyHidFactory::create(&libcfg)?;
+    let attestation = device.make_credential_with_args(&make_credential_args)?;
+    dbg!(&attestation.attstmt_alg);
+    let verify_result = verifier::verify_attestation("ssh:", &challenge, &attestation);
+    if !verify_result.is_success {
+        return Err(anyhow!("Failed to verify attestation"));
+    }
+
+    let mut privkey_bytes = Vec::new();
+    if matches!(key_type, CredentialSupportedKeyType::Ecdsa256) {
+        "nistp256".encode(&mut privkey_bytes)?;
+    }
+    verify_result
+        .credential_public_key
+        .der
+        .encode(&mut privkey_bytes)?;
+    "ssh:".encode(&mut privkey_bytes)?;
+    let flags = (attestation.flags_user_present_result as u8)
+        | (attestation.flags_user_verified_result as u8) << 2
+        | (attestation.flags_attested_credential_data_included as u8) << 6
+        | (attestation.flags_extension_data_included as u8) << 7;
+    privkey_bytes.push(flags);
+    verify_result.credential_id.encode(&mut privkey_bytes)?;
+    "".encode(&mut privkey_bytes)?;
+    let privkey = match key_type {
+        CredentialSupportedKeyType::Ecdsa256 => PrivateKey::new(
+            private::SkEcdsaSha2NistP256::decode(&mut privkey_bytes.as_slice())?.into(),
+            args.comment,
+        )?,
+        CredentialSupportedKeyType::Ed25519 => PrivateKey::new(
+            private::SkEd25519::decode(&mut privkey_bytes.as_slice())?.into(),
+            args.comment,
+        )?,
+    };
+
+    let mut ssh_attest = Vec::new();
+    "ssh-sk-attest-v01".encode(&mut ssh_attest)?;
+    attestation.attstmt_x5c[0].encode(&mut ssh_attest)?;
+    attestation.attstmt_sig.encode(&mut ssh_attest)?;
+    attestation.auth_data.encode(&mut ssh_attest)?;
+    0u32.encode(&mut ssh_attest)?;
+    "".encode(&mut ssh_attest)?;
+
+    std::fs::write(&privkey_path, &*privkey.to_openssh(LineEnding::default())?)?;
+    std::fs::set_permissions(&privkey_path, Permissions::from_mode(0o600))?;
+    std::fs::write(&pubkey_path, privkey.public_key().to_openssh()?)?;
+    if args.write_attestation {
+        std::fs::write(&attest_info_path, &ssh_attest)?;
+        std::fs::write(&attest_challenge_path, &challenge)?;
+    }
+
+    Ok(())
+}