From 117cb6bc5e3777f547a12b37abb14772b7dd322e Mon Sep 17 00:00:00 2001
From: shimun <shimun@shimun.net>
Date: Wed, 30 Nov 2022 14:59:29 +0100
Subject: [PATCH] init

---
 Cargo.lock         | 2076 ++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml         |   27 +
 flake.lock         |   62 ++
 flake.nix          |  103 +++
 src/api.rs         |  205 +++++
 src/api/extract.rs |   31 +
 src/certs.rs       |   96 ++
 src/client.rs      |   90 ++
 src/main.rs        |   29 +
 9 files changed, 2719 insertions(+)
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 src/api.rs
 create mode 100644 src/api/extract.rs
 create mode 100644 src/certs.rs
 create mode 100644 src/client.rs
 create mode 100644 src/main.rs

diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..81be549
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,2076 @@
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+checksum = "eaf9f5aceeec8be17c128b2e93e031fb8a4d469bb9c4ae2d7dc1888b26887268"
+dependencies = [
+ "cfg-if",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4c8ffb332579b0557b52d268b91feab8df3615f265d5270fec2a8c95b17c1142"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-futures"
+version = "0.4.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23639446165ca5a5de86ae1d8896b737ae80319560fbaa4c2887b7da6e7ebd7d"
+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "052be0f94026e6cbc75cdefc9bae13fd6052cdcaf532fa6c45e7ae33a1e6c810"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "07bc0c051dc5f23e307b13285f9d75df86bfdf816c5721e573dec1f9b8aa193c"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.83"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c38c045535d93ec4f0b4defec448e4291638ee608530863b1e2ba115d4fff7f"
+
+[[package]]
+name = "web-sys"
+version = "0.3.60"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bcda906d8be16e728fd5adc5b729afad4e444e106ab28cd1c7256e54fa61510f"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-sys"
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+checksum = "ea04155a16a59f9eab786fe12a4a450e75cdb175f9e0d80da1e17db09f55b8d2"
+dependencies = [
+ "windows_aarch64_msvc 0.36.1",
+ "windows_i686_gnu 0.36.1",
+ "windows_i686_msvc 0.36.1",
+ "windows_x86_64_gnu 0.36.1",
+ "windows_x86_64_msvc 0.36.1",
+]
+
+[[package]]
+name = "windows-sys"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc 0.42.0",
+ "windows_i686_gnu 0.42.0",
+ "windows_i686_msvc 0.42.0",
+ "windows_x86_64_gnu 0.42.0",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc 0.42.0",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "41d2aa71f6f0cbe00ae5167d90ef3cfe66527d6f613ca78ac8024c3ccab9a19e"
+
+[[package]]
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+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9bb8c3fd39ade2d67e9874ac4f3db21f0d710bee00fe7cab16949ec184eeaa47"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dd0f252f5a35cac83d6311b2e795981f5ee6e67eb1f9a7f64eb4500fbc4dcdb4"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "180e6ccf01daf4c426b846dfc66db1fc518f074baa793aa7d9b9aaeffad6a3b6"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fbeae19f6716841636c28d695375df17562ca208b2b7d0dc47635a50ae6c5de7"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "84c12f65daa39dd2babe6e442988fc329d6243fdce47d7d2d155b8d874862246"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4dcd171b8776c41b97521e5da127a2d86ad280114807d0b2ab1e462bc764d9e1"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bf7b1b21b5362cbc318f686150e5bcea75ecedc74dd157d874d754a2ca44b0ed"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09d525d2ba30eeb3297665bd434a54297e4170c7f1a44cad4ef58095b4cd2028"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.36.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c811ca4a8c853ef420abd8592ba53ddbbac90410fab6903b3e79972a631f7680"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.42.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f40009d85759725a34da6d89a94e63d7bdc50a862acf0dbc7c8e488f1edcb6f5"
+
+[[package]]
+name = "winreg"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "zeroize"
+version = "1.5.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c394b5bd0c6f669e7275d9c20aa90ae064cb22e75a1cad54e1b34088034b149f"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f8f187641dad4f680d25c4bfc4225b418165984179f26ca76ec4fb6441d3a17"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+ "synstructure",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..3b22404
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "ssh-cert-dist"
+version = "0.1.0"
+authors = ["shimun <shimun@shimun.net>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.66"
+async-trait = "0.1.59"
+axum = { version = "0.6.1", features = ["http2"] }
+axum-extra = { version = "0.4.1", features = ["typed-routing"] }
+clap = { version = "4.0.29", features = ["env", "derive"] }
+reqwest = "0.11.13"
+serde = { version = "1.0.148", features = ["derive"] }
+ssh-key = { version = "0.5.1", features = ["ed25519", "p256", "p384", "rsa", "signature"] }
+tokio = { version = "1.22.0", features = ["io-std", "test-util", "tracing", "macros", "fs"] }
+tower = { version = "0.4.13", features = ["util"] }
+tower-http = { version = "0.3.4", features = ["map-request-body"] }
+tracing = "0.1.37"
+tracing-subscriber = "0.3.16"
+url = "2.3.1"
+
+[patch.crates-io]
+ssh-key = { git = "https://github.com/a-dma/SSH.git", branch = "u2f_signatures" }
+
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..943419e
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,62 @@
+{
+  "nodes": {
+    "naersk": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1662220400,
+        "narHash": "sha256-9o2OGQqu4xyLZP9K6kNe1pTHnyPz0Wr3raGYnr9AIgY=",
+        "owner": "nmattia",
+        "repo": "naersk",
+        "rev": "6944160c19cb591eb85bbf9b2f2768a935623ed3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nmattia",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1669411043,
+        "narHash": "sha256-LfPd3+EY+jaIHTRIEOUtHXuanxm59YKgUacmSzaqMLc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "5dc7114b7b256d217fe7752f1614be2514e61bb8",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs",
+        "utils": "utils"
+      }
+    },
+    "utils": {
+      "locked": {
+        "lastModified": 1667395993,
+        "narHash": "sha256-nuEHfE/LcWyuSWnS8t12N1wc105Qtau+/OdUAjtQ0rA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "5aed5285a952e0b949eb3ba02c12fa4fcfef535f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..3c5be84
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,103 @@
+{
+  description = "A naersk based rust flake";
+
+  inputs = {
+    utils.url = "github:numtide/flake-utils";
+    naersk = {
+      url = "github:nmattia/naersk";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    # fenix.url = "github:nix-community/fenix";
+  };
+
+  outputs = inputs @ { self, nixpkgs, utils, naersk, ... }:
+    let
+      root = inputs.source or self;
+      pname = (builtins.fromTOML (builtins.readFile (root + "/Cargo.toml"))).package.name;
+      # toolchains: stable, beta, default(nightly)
+      toolchain = pkgs: if inputs ? fenix then inputs.fenix.packages."${pkgs.system}".complete.toolchain 
+                  else with pkgs; symlinkJoin { name = "rust-toolchain"; paths = [ rustc cargo ]; };
+      forSystem = system:
+      let 
+        pkgs = nixpkgs.legacyPackages."${system}";
+      in
+        rec {
+          # `nix build`
+          packages.${pname} = (self.overlay pkgs pkgs).${pname};
+
+          packages.dockerImage = pkgs.runCommandLocal "docker-${pname}.tar.gz" {} "${apps.streamDockerImage.program} | gzip --fast > $out";
+
+          packages.default = packages.${pname};
+
+          # `nix run`
+          apps.${pname} = utils.lib.mkApp {
+            drv = packages.${pname};
+          };
+          
+          # `nix run .#streamDockerImage | docker load`
+          apps.streamDockerImage = utils.lib.mkApp {
+            drv = with pkgs; dockerTools.streamLayeredImage {
+              name = pname;
+              tag = self.shortRev or "latest";
+              config = {
+                Entrypoint = apps.default.program;
+              };
+            };
+            exePath = "";
+          };
+          apps.default = apps.${pname};
+
+          # `nix flake check`
+          checks = {
+            fmt = with pkgs; runCommandLocal "${pname}-fmt" { buildInputs = [ cargo rustfmt nixpkgs-fmt ]; } ''
+              cd ${root}
+              cargo fmt -- --check
+              nixpkgs-fmt --check *.nix
+              touch $out
+            '';
+          };
+
+          hydraJobs = checks // packages;
+
+          # `nix develop`
+          devShell = pkgs.mkShell rec {
+            RUST_SRC_PATH = "${if inputs ? fenix then "${toolchain pkgs}/lib/rustlib" else pkgs.rustPlatform.rustLibSrc}";
+            RUST_LOG = "debug";
+            nativeBuildInputs = with pkgs; [ (toolchain pkgs) cargo-watch rustfmt nixpkgs-fmt ] ++ packages.default.nativeBuildInputs;
+            inherit (packages.default) buildInputs;
+            shellHook = ''
+              printf "Rust version:"
+              rustc --version
+              printf "\nbuild inputs: ${pkgs.lib.concatStringsSep ", " (map (bi: bi.name) (buildInputs ++ nativeBuildInputs))}"
+            '';
+          };
+
+        };
+    in
+    (utils.lib.eachDefaultSystem forSystem) // {
+      overlays.pinned = final: prev: (self.overlay final (import nixpkgs {
+        inherit (final) localSystem;
+      })).packages;
+      overlay = final: prev:
+        let
+          naersk-lib = naersk.lib."${final.system}".override {
+            rustc = toolchain prev;
+            cargo = toolchain prev;
+          };
+          buildInputs = with prev; [ 
+            openssl 
+          ];
+          nativeBuildInputs = with prev; [
+            pkg-config
+          ];
+        in
+        {
+          "${pname}" =
+            naersk-lib.buildPackage {
+              inherit pname root buildInputs nativeBuildInputs;
+            };
+        };
+
+    };
+
+}
diff --git a/src/api.rs b/src/api.rs
new file mode 100644
index 0000000..23a4bee
--- /dev/null
+++ b/src/api.rs
@@ -0,0 +1,205 @@
+mod extract;
+
+use std::collections::HashMap;
+use std::net::SocketAddr;
+use std::path::{self, PathBuf};
+use std::sync::Arc;
+
+use crate::certs::{load_cert, read_certs, read_pubkey, store_cert};
+use anyhow::Context;
+use axum::body::{self};
+use axum::extract::{Path, State};
+use axum::routing::{post, put};
+use axum::{http::StatusCode, response::IntoResponse, Router};
+use axum_extra::routing::{
+    RouterExt, // for `Router::typed_*`
+    TypedPath,
+};
+use clap::Parser;
+use serde::Deserialize;
+use ssh_key::{Certificate, PublicKey};
+use tokio::sync::Mutex;
+use tower::ServiceBuilder;
+use tower_http::ServiceBuilderExt;
+
+use self::extract::CertificateBody;
+
+#[derive(Parser)]
+pub struct ApiArgs {
+    #[clap(short = 'a', long = "address")]
+    address: SocketAddr,
+    #[clap(short = 'c', long = "cert-store")]
+    cert_dir: PathBuf,
+    /// CA public key
+    #[clap(long = "ca")]
+    ca: PathBuf,
+}
+
+impl Default for ApiArgs {
+    fn default() -> Self {
+        Self {
+            address: SocketAddr::from(([127, 0, 0, 1], 3000)),
+            cert_dir: "certs".into(),
+            ca: "certs/ca.pub".into(),
+        }
+    }
+}
+
+#[derive(Debug, Clone)]
+struct ApiState {
+    certs: Arc<Mutex<HashMap<String, Certificate>>>,
+    cert_dir: PathBuf,
+    ca: PublicKey,
+}
+
+impl ApiState {
+    async fn new(
+        cert_dir: impl AsRef<path::Path>,
+        ca_file: impl AsRef<path::Path>,
+    ) -> anyhow::Result<Self> {
+        let ca = read_pubkey(ca_file.as_ref()).await?;
+        let certs = read_certs(&ca, cert_dir.as_ref()).await?;
+        Ok(Self {
+            certs: Arc::new(Mutex::new(
+                certs
+                    .into_iter()
+                    .map(|cert| (cert.key_id().to_string(), cert))
+                    .collect(),
+            )),
+            cert_dir: cert_dir.as_ref().into(),
+            ca,
+        })
+    }
+}
+
+pub async fn run(
+    ApiArgs {
+        address,
+        cert_dir,
+        ca,
+    }: ApiArgs,
+) -> anyhow::Result<()> {
+    let state = ApiState::new(&cert_dir, &ca).await?;
+
+    #[cfg(feature = "reload")]
+    {
+        let state = state.clone();
+
+        tokio::spawn(async move {
+            loop {
+                tokio::time::sleep(Duration::from_secs(30)).await;
+                if let Ok(certs) = read_certs(&state.ca, &state.cert_dir).await {
+                    *state.certs.lock().await = certs
+                        .into_iter()
+                        .map(|cert| (cert.key_id().to_string(), cert))
+                        .collect();
+                    debug!("reloaded certs");
+                }
+            }
+        });
+    }
+
+    let app = Router::new()
+        .typed_get(get_certs_identifier)
+        .route("/certs/:identifier", post(post_certs_identifier))
+        .route("/certs/:identifier", put(put_certs_identifier_update))
+        .layer(ServiceBuilder::new().map_request_body(body::boxed))
+        .with_state(state);
+
+    // run our app with hyper
+    // `axum::Server` is a re-export of `hyper::Server`
+    tracing::debug!("listening on {}", address);
+    axum::Server::bind(&address)
+        .serve(app.into_make_service())
+        .await
+        .unwrap();
+    Ok(())
+}
+
+pub enum ApiError {
+    Internal,
+    NotFound,
+    Invalid,
+    LowSerial(u64, u64),
+}
+
+type ApiResult<T> = Result<T, ApiError>;
+
+impl IntoResponse for ApiError {
+    fn into_response(self) -> axum::response::Response {
+        match self {
+            Self::NotFound => (StatusCode::NOT_FOUND, "not here").into_response(),
+            Self::LowSerial(prev, next) => (
+                StatusCode::BAD_REQUEST,
+                format!(
+                    "new certificate serial must be greater than {}, got {}",
+                    prev, next
+                ),
+            )
+                .into_response(),
+            _ => (StatusCode::INTERNAL_SERVER_ERROR, "Oops").into_response(),
+        }
+    }
+}
+
+impl From<anyhow::Error> for ApiError {
+    fn from(_: anyhow::Error) -> Self {
+        ApiError::Internal
+    }
+}
+
+#[derive(TypedPath, Deserialize)]
+#[typed_path("/certs/:identifier")]
+pub struct GetCert {
+    pub identifier: String,
+}
+
+/// Retrieve an certificate for identifier
+/// TODO: add option to require auth
+/// return Unauthorized with an challenge
+/// upon which the client will ssh-keysign
+/// the challene an issue an post request
+async fn get_certs_identifier(
+    GetCert { identifier }: GetCert,
+    State(ApiState { certs, .. }): State<ApiState>,
+) -> ApiResult<String> {
+    let certs = certs.lock().await;
+    let cert = certs.get(&identifier).ok_or(ApiError::NotFound)?;
+    Ok(cert.to_openssh().context("to openssh")?)
+}
+
+/// POST with signed challenge
+async fn post_certs_identifier(
+    State(ApiState { .. }): State<ApiState>,
+    Path(_identifier): Path<String>,
+) -> ApiResult<String> {
+    unimplemented!()
+}
+
+/// Upload an cert with an higher serial than the previous
+async fn put_certs_identifier_update(
+    State(ApiState {
+        ca,
+        cert_dir,
+        certs,
+        ..
+    }): State<ApiState>,
+    Path(identifier): Path<String>,
+    CertificateBody(cert): CertificateBody,
+) -> ApiResult<String> {
+    cert.validate(&[ca.fingerprint(Default::default())])
+        .map_err(|_| ApiError::Invalid)?;
+    let _string_repr = cert.to_openssh();
+    let prev = load_cert(&cert_dir, &ca, &identifier).await?;
+    let mut prev_serial = 0;
+    let serial = cert.serial();
+    if let Some(prev) = prev {
+        prev_serial = prev.serial();
+        if prev.serial() >= cert.serial() {
+            return Err(ApiError::LowSerial(prev_serial, serial));
+        }
+    }
+    store_cert(&cert_dir, &ca, &cert).await?;
+    certs.lock().await.insert(cert.key_id().to_string(), cert);
+    Ok(format!("{} -> {}", prev_serial, serial))
+}
diff --git a/src/api/extract.rs b/src/api/extract.rs
new file mode 100644
index 0000000..3271d7a
--- /dev/null
+++ b/src/api/extract.rs
@@ -0,0 +1,31 @@
+use anyhow::Context;
+use axum::{
+    async_trait, body::BoxBody, extract::FromRequest, http::Request, response::IntoResponse,
+};
+use ssh_key::Certificate;
+
+use super::ApiError;
+
+#[derive(Debug, Clone)]
+pub struct CertificateBody(pub Certificate);
+
+// we must implement `FromRequest` (and not `FromRequestParts`) to consume the body
+#[async_trait]
+impl<S> FromRequest<S, BoxBody> for CertificateBody
+where
+    S: Send + Sync,
+{
+    type Rejection = ApiError;
+
+    async fn from_request(req: Request<BoxBody>, state: &S) -> Result<Self, Self::Rejection> {
+        let body = String::from_request(req, state)
+            .await
+            .map_err(|err| err.into_response())
+            .unwrap(); //.context("failed to extract body")?;
+
+        let cert = Certificate::from_openssh(&body)
+            .with_context(|| format!("failed to parse '{}'", body))?;
+
+        Ok(Self(cert))
+    }
+}
diff --git a/src/certs.rs b/src/certs.rs
new file mode 100644
index 0000000..c20d8d9
--- /dev/null
+++ b/src/certs.rs
@@ -0,0 +1,96 @@
+use anyhow::Context;
+use ssh_key::{Certificate, PublicKey};
+use std::path::{Path, PathBuf};
+use tokio::fs;
+use tracing::trace;
+
+pub async fn read_certs(
+    ca: &PublicKey,
+    path: impl AsRef<Path>,
+) -> anyhow::Result<Vec<Certificate>> {
+    read_dir(path.as_ref().join(ca_dir(ca))).await
+}
+
+pub async fn read_dir(path: impl AsRef<Path>) -> anyhow::Result<Vec<Certificate>> {
+    let mut dir = fs::read_dir(path.as_ref())
+        .await
+        .context("read certs dir")?;
+    let mut certs = Vec::new();
+    while let Some(entry) = dir.next_entry().await? {
+        //TODO: investigate why path().ends_with doesn't work
+        if !entry
+            .file_name()
+            .into_string()
+            .unwrap()
+            .ends_with("-cert.pub")
+        {
+            trace!(
+                "skipped {:?} due to missing '-cert.pub' extension",
+                entry.path()
+            );
+            continue;
+        }
+        let contents = fs::read(&entry.path())
+            .await
+            .with_context(|| format!("read {:?}", entry.path()))?;
+        let string_repr = parse_utf8(contents)?;
+        let cert = Certificate::from_openssh(&string_repr)
+            .with_context(|| format!("parse {:?} as openssh certificate", entry.path()))?;
+        certs.push(cert);
+    }
+    Ok(certs)
+}
+
+fn parse_utf8(bytes: Vec<u8>) -> anyhow::Result<String> {
+    String::from_utf8(bytes).context("invalid utf-8")
+}
+
+pub async fn read_pubkey(path: impl AsRef<Path>) -> anyhow::Result<PublicKey> {
+    let contents = fs::read(&path)
+        .await
+        .with_context(|| format!("read {:?}", path.as_ref()))?;
+    let string_repr = parse_utf8(contents)?;
+    PublicKey::from_openssh(&string_repr)
+        .with_context(|| format!("parse '{}' as public key", string_repr))
+}
+
+fn ca_dir(ca: &PublicKey) -> String {
+    ca.comment().to_string()
+}
+
+fn cert_path(ca: &PublicKey, identifier: &str) -> String {
+    let _ca_fingerprint = ca.fingerprint(Default::default());
+    format!("{}/{}-cert.pub", ca_dir(ca), identifier)
+}
+
+pub async fn store_cert(
+    cert_dir: impl AsRef<Path>,
+    ca: &PublicKey,
+    cert: &Certificate,
+) -> anyhow::Result<PathBuf> {
+    // TODO: proper store
+    let path = cert_dir.as_ref().join(cert_path(&ca, cert.key_id()));
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent).await?;
+    }
+    fs::write(&path, cert.to_openssh().context("encode cert")?).await?;
+    Ok(path)
+}
+
+pub async fn load_cert(
+    cert_dir: impl AsRef<Path>,
+    ca: &PublicKey,
+    identifier: &str,
+) -> anyhow::Result<Option<Certificate>> {
+    let path = cert_dir.as_ref().join(cert_path(ca, identifier));
+    if !path.exists() {
+        return Ok(None);
+    }
+    let contents = fs::read(&path)
+        .await
+        .with_context(|| format!("read {:?}", &path))?;
+    let string_repr = parse_utf8(contents)?;
+    Ok(Some(Certificate::from_openssh(&string_repr).with_context(
+        || format!("parse {:?} as openssh certificate", &path),
+    )?))
+}
diff --git a/src/client.rs b/src/client.rs
new file mode 100644
index 0000000..0a40489
--- /dev/null
+++ b/src/client.rs
@@ -0,0 +1,90 @@
+use axum_extra::routing::TypedPath;
+use clap::{Args, Parser, Subcommand};
+use reqwest::StatusCode;
+use ssh_key::Certificate;
+use std::path::PathBuf;
+use tokio::fs;
+use tracing::{debug, info};
+use url::Url;
+
+use crate::{api::GetCert, certs::read_dir};
+
+#[derive(Parser)]
+pub struct ClientArgs {
+    /// Url for the API endpoint
+    #[clap(short = 'a', long = "api-endpoint")]
+    api: Url,
+}
+
+#[derive(Parser)]
+pub struct FetchArgs {
+    #[clap(flatten)]
+    args: ClientArgs,
+    #[clap(short = 'c', long = "cert-dir", default_value = "~/.ssh")]
+    cert_dir: PathBuf,
+    /// CA public key
+    #[clap(long = "ca")]
+    ca: PathBuf,
+}
+
+#[derive(Args)]
+pub struct ClientCommand {
+    #[clap(subcommand)]
+    cmd: ClientCommands,
+}
+
+#[derive(Subcommand)]
+pub enum ClientCommands {
+    Fetch(FetchArgs),
+    Upload,
+}
+
+pub async fn run(ClientCommand { cmd }: ClientCommand) -> anyhow::Result<()> {
+    match cmd {
+        ClientCommands::Fetch(args) => fetch(args).await,
+        ClientCommands::Upload => unimplemented!(),
+    }
+}
+
+async fn fetch(
+    FetchArgs {
+        cert_dir,
+        ca: _,
+        args: ClientArgs { api },
+    }: FetchArgs,
+) -> anyhow::Result<()> {
+    let certs = read_dir(&cert_dir).await?;
+    let client = reqwest::Client::new();
+    for cert in certs {
+        let path = GetCert {
+            identifier: cert.key_id().to_string(),
+        };
+        debug!("checking {}", cert.key_id());
+        let url = api.join(path.to_uri().path())?;
+        let resp = client.get(url.clone()).send().await?;
+        if resp.status() != StatusCode::OK {
+            continue;
+        }
+        let string_repr = resp.text().await?;
+        let remote_cert = Certificate::from_openssh(&string_repr)?;
+        if remote_cert
+            .validate(&[cert.signature_key().fingerprint(Default::default())])
+            .is_err()
+        {
+            info!("invalid signature {}, skipping", &url);
+            continue;
+        }
+        if cert.serial() >= remote_cert.serial() {
+            debug!("{} is not newer than local version", &url);
+            continue;
+        }
+        fs::write(cert_dir.join(cert.key_id()), remote_cert.to_openssh()?).await?;
+        info!(
+            "updated {}: {} -> {}",
+            cert.key_id(),
+            cert.serial(),
+            remote_cert.serial()
+        );
+    }
+    Ok(())
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..89b6f3f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,29 @@
+use api::ApiArgs;
+use clap::Parser;
+#[cfg(feature = "client")]
+use client::ClientCommand;
+use tracing_subscriber;
+
+mod api;
+mod certs;
+#[cfg(feature = "client")]
+mod client;
+
+#[derive(Parser)]
+enum Command {
+    Server(ApiArgs),
+    #[cfg(feature = "client")]
+    Client(ClientCommand),
+}
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> anyhow::Result<()> {
+    tracing_subscriber::fmt::init();
+
+    match Command::parse() {
+        Command::Server(args) => api::run(args).await?,
+        #[cfg(feature = "client")]
+        Command::Client(args) => client::run(args).await?,
+    }
+    Ok(())
+}