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Add TUF support
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Allow Fulcio and Rekor data to be fetched from the official
TUF repository of Sigstore.

A new module is introduced, called `tuf`, which provides helper
structs to interact with a remote TUF repository.

Fixes sigstore#9

Signed-off-by: Flavio Castelli <[email protected]>
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@flavio
flavio committed Jan 27, 2022
1 parent 35fcc0f commit 2588d9d
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Showing 21 changed files with 1,456 additions and 19 deletions.
7 changes: 6 additions & 1 deletion Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,14 +20,19 @@ ecdsa = { version = "0.12.4", features = ["verify", "pem", "der", "pkcs8"] }
oci-distribution = { version = "0.8.1", default-features = false }
olpc-cjson = "0.1.1"
p256 = {version = "0.9.0", features = ["ecdsa-core"]}
sha2 = "0.10.1"
serde_json = "1.0.68"
serde = {version = "1.0.130", features = ["derive"]}
tokio = { version = "1.12.0", features = ["full"]}
# TODO: point to an official release once https://github.com/awslabs/tough/pull/444 is out
tough = { git = "https://github.com/awslabs/tough", rev = "d9f0cb86ff1cb16d6838c40366608fccc50fcbc7", features = [ "http" ] }
tracing = "0.1.29"
url = "2.2.2"
x509-parser = { version = "0.12.0", features = ["verify"]}

[dev-dependencies]
chrono = "0.4.19"
clap = "2.33.3"
openssl = "0.10.38"
tracing-subscriber = "0.2.25"
tempdir = "0.3.7"
tracing-subscriber = "0.2.25"
81 changes: 63 additions & 18 deletions examples/verify/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -16,16 +16,19 @@
extern crate sigstore;
use sigstore::cosign::CosignCapabilities;
use sigstore::simple_signing::SimpleSigning;
use sigstore::tuf::SigstoreRepository;

extern crate anyhow;
use anyhow::{anyhow, Result};

use std::{collections::HashMap, fs};

extern crate clap;
use clap::{App, Arg};

use std::{collections::HashMap, fs};
use tokio::task::spawn_blocking;

extern crate tracing_subscriber;
use tracing::info;
use tracing_subscriber::prelude::*;
use tracing_subscriber::{fmt, EnvFilter};

Expand All @@ -41,6 +44,13 @@ fn cli() -> App<'static, 'static> {
.required(false)
.takes_value(true),
)
.arg(
Arg::with_name("use-sigstore-tuf-data")
.long("use-sigstore-tuf-data")
.help("Fetch Rekor and Fulcio data from Sigstore's TUF repository")
.required(false)
.takes_value(false),
)
.arg(
Arg::with_name("rekor-pub-key")
.long("rekor-pub-key")
Expand Down Expand Up @@ -96,28 +106,75 @@ fn cli() -> App<'static, 'static> {

async fn run_app() -> Result<Vec<SimpleSigning>> {
let matches = cli().get_matches();
if matches.is_present("rekor-pub-key")
&& (matches.is_present("rekor-pub-key") || matches.is_present("fulcio-crt"))
{
return Err(anyhow!("Cannot use "));
}

// setup logging
let level_filter = if matches.is_present("verbose") {
"debug"
} else {
"info"
};
let filter_layer = EnvFilter::new(level_filter);
tracing_subscriber::registry()
.with(filter_layer)
.with(fmt::layer().with_writer(std::io::stderr))
.init();

let auth = &sigstore::registry::Auth::Anonymous;

let rekor_pub_key: Option<String> = matches
.value_of("rekor-pub-key")
.map(|path| fs::read_to_string(path).expect("Error reading rekor public key from disk"));
.map(|path| {
fs::read_to_string(path)
.map_err(|e| anyhow!("Error reading rekor public key from disk: {}", e))
})
.transpose()?;

let fulcio_cert: Option<Vec<u8>> = matches
.value_of("fulcio-crt")
.map(|path| fs::read(path).expect("Error reading fulcio certificate from disk"));
.map(|path| {
fs::read(path).map_err(|e| anyhow!("Error reading fulcio certificate from disk: {}", e))
})
.transpose()?;

let sigstore_repo: Option<SigstoreRepository> = if matches.is_present("use-sigstore-tuf-data") {
let repo: Result<SigstoreRepository> = spawn_blocking(|| {
info!("Downloading data from Sigstore TUF repository");
sigstore::tuf::SigstoreRepository::fetch(None)
})
.await
.map_err(|e| anyhow!("Error spawining blocking task inside of tokio: {}", e))?;

Some(repo?)
} else {
None
};

let mut client_builder = sigstore::cosign::ClientBuilder::default();

if let Some(repo) = sigstore_repo {
client_builder = client_builder.with_rekor_pub_key(repo.rekor_pub_key());
client_builder = client_builder.with_fulcio_cert(repo.fulcio_cert());
}

// Set Rekor public key. Give higher precendece to the key specified by the user over the
// one that can be obtained from Sigstore's TUF repository
if let Some(key) = rekor_pub_key {
client_builder = client_builder.with_rekor_pub_key(&key);
}
// Set Fulcio certificate. Give higher precendece to the certificate specified by the user over the
// one that can be obtained from Sigstore's TUF repository
if let Some(cert) = fulcio_cert {
client_builder = client_builder.with_fulcio_cert(&cert);
}

let mut client = client_builder
.with_cert_email(matches.value_of("cert-email"))
.build()
.expect("Error while building cosign client");
.build()?;

let image: &str = matches.value_of("IMAGE").unwrap();

Expand Down Expand Up @@ -149,18 +206,6 @@ async fn run_app() -> Result<Vec<SimpleSigning>> {
}
};

// setup logging
let level_filter = if matches.is_present("verbose") {
"debug"
} else {
"info"
};
let filter_layer = EnvFilter::new(level_filter);
tracing_subscriber::registry()
.with(filter_layer)
.with(fmt::layer().with_writer(std::io::stderr))
.init();

client
.verify(
auth,
Expand Down
10 changes: 10 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -108,6 +108,15 @@
//! }
//! ```
//!
//! ## Fulcio and Rekor integration
//!
//! [`cosign::Client`](crate::cosign::Client) integration with Fulcio and Rekor
//! requires the following data to work: Fulcio's certificate and Rekor's public key.
//!
//! These files are safely distributed by the Sigstore project via a TUF repository.
//! The [`sigstore::tuf`](crate::tuf) module provides the helper structures to deal
//! with it.
//!
//! # Examples
//!
//! Additional examples can be found inside of the [`examples`](https://github.com/sigstore/sigstore-rs/tree/main/examples/)
Expand All @@ -119,3 +128,4 @@ mod mock_client;
pub mod cosign;
pub mod registry;
pub mod simple_signing;
pub mod tuf;
166 changes: 166 additions & 0 deletions src/tuf/constants.rs
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Original file line number Diff line number Diff line change
@@ -0,0 +1,166 @@
//
// Copyright 2021 The Sigstore Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

pub(crate) const SIGSTORE_METADATA_BASE: &str = "http://sigstore-tuf-root.storage.googleapis.com/";
pub(crate) const SIGSTORE_TARGET_BASE: &str =
"http://sigstore-tuf-root.storage.googleapis.com/targets";

pub(crate) const SIGSTORE_FULCIO_CERT_TARGET: &str = "fulcio.crt.pem";
pub(crate) const SIGSTORE_REKOR_PUB_KEY_TARGET: &str = "rekor.pub";

pub(crate) const SIGSTORE_ROOT: &str = r#"{
"signatures": [
{
"keyid": "2f64fb5eac0cf94dd39bb45308b98920055e9a0d8e012a7220787834c60aef97",
"sig": "3046022100d3ea59490b253beae0926c6fa63f54336dea1ed700555be9f27ff55cd347639c0221009157d1ba012cead81948a4ab777d355451d57f5c4a2d333fc68d2e3f358093c2"
},
{
"keyid": "bdde902f5ec668179ff5ca0dabf7657109287d690bf97e230c21d65f99155c62",
"sig": "304502206eaef40564403ce572c6d062e0c9b0aab5e0223576133e081e1b495e8deb9efd02210080fd6f3464d759601b4afec596bbd5952f3a224cd06ed1cdfc3c399118752ba2"
},
{
"keyid": "eaf22372f417dd618a46f6c627dbc276e9fd30a004fc94f9be946e73f8bd090b",
"sig": "304502207baace02f56d8e6069f10b6ff098a26e7f53a7f9324ad62cffa0557bdeb9036c022100fb3032baaa090d0040c3f2fd872571c84479309b773208601d65948df87a9720"
},
{
"keyid": "f40f32044071a9365505da3d1e3be6561f6f22d0e60cf51df783999f6c3429cb",
"sig": "304402205180c01905505dd88acd7a2dad979dd75c979b3722513a7bdedac88c6ae8dbeb022056d1ddf7a192f0b1c2c90ff487de2fb3ec9f0c03f66ea937c78d3b6a493504ca"
},
{
"keyid": "f505595165a177a41750a8e864ed1719b1edfccd5a426fd2c0ffda33ce7ff209",
"sig": "3046022100c8806d4647c514d80fd8f707d3369444c4fd1d0812a2d25f828e564c99790e3f022100bb51f12e862ef17a7d3da2ac103bebc5c7e792237006c4cafacd76267b249c2f"
}
],
"signed": {
"_type": "root",
"consistent_snapshot": false,
"expires": "2022-05-11T19:09:02.663975009Z",
"keys": {
"2f64fb5eac0cf94dd39bb45308b98920055e9a0d8e012a7220787834c60aef97": {
"keyid_hash_algorithms": [
"sha256",
"sha512"
],
"keytype": "ecdsa-sha2-nistp256",
"keyval": {
"public": "04cbc5cab2684160323c25cd06c3307178a6b1d1c9b949328453ae473c5ba7527e35b13f298b41633382241f3fd8526c262d43b45adee5c618fa0642c82b8a9803"
},
"scheme": "ecdsa-sha2-nistp256"
},
"b6710623a30c010738e64c5209d367df1c0a18cf90e6ab5292fb01680f83453d": {
"keyid_hash_algorithms": [
"sha256",
"sha512"
],
"keytype": "ecdsa-sha2-nistp256",
"keyval": {
"public": "04fa1a3e42f2300cd3c5487a61509348feb1e936920fef2f83b7cd5dbe7ba045f538725ab8f18a666e6233edb7e0db8766c8dc336633449c5e1bbe0c182b02df0b"
},
"scheme": "ecdsa-sha2-nistp256"
},
"bdde902f5ec668179ff5ca0dabf7657109287d690bf97e230c21d65f99155c62": {
"keyid_hash_algorithms": [
"sha256",
"sha512"
],
"keytype": "ecdsa-sha2-nistp256",
"keyval": {
"public": "04a71aacd835dc170ba6db3fa33a1a33dee751d4f8b0217b805b9bd3242921ee93672fdcfd840576c5bb0dc0ed815edf394c1ee48c2b5e02485e59bfc512f3adc7"
},
"scheme": "ecdsa-sha2-nistp256"
},
"eaf22372f417dd618a46f6c627dbc276e9fd30a004fc94f9be946e73f8bd090b": {
"keyid_hash_algorithms": [
"sha256",
"sha512"
],
"keytype": "ecdsa-sha2-nistp256",
"keyval": {
"public": "04117b33dd265715bf23315e368faa499728db8d1f0a377070a1c7b1aba2cc21be6ab1628e42f2cdd7a35479f2dce07b303a8ba646c55569a8d2a504ba7e86e447"
},
"scheme": "ecdsa-sha2-nistp256"
},
"f40f32044071a9365505da3d1e3be6561f6f22d0e60cf51df783999f6c3429cb": {
"keyid_hash_algorithms": [
"sha256",
"sha512"
],
"keytype": "ecdsa-sha2-nistp256",
"keyval": {
"public": "04cc1cd53a61c23e88cc54b488dfae168a257c34fac3e88811c55962b24cffbfecb724447999c54670e365883716302e49da57c79a33cd3e16f81fbc66f0bcdf48"
},
"scheme": "ecdsa-sha2-nistp256"
},
"f505595165a177a41750a8e864ed1719b1edfccd5a426fd2c0ffda33ce7ff209": {
"keyid_hash_algorithms": [
"sha256",
"sha512"
],
"keytype": "ecdsa-sha2-nistp256",
"keyval": {
"public": "048a78a44ac01099890d787e5e62afc29c8ccb69a70ec6549a6b04033b0a8acbfb42ab1ab9c713d225cdb52b858886cf46c8e90a7f3b9e6371882f370c259e1c5b"
},
"scheme": "ecdsa-sha2-nistp256"
},
"fc61191ba8a516fe386c7d6c97d918e1d241e1589729add09b122725b8c32451": {
"keyid_hash_algorithms": [
"sha256",
"sha512"
],
"keytype": "ecdsa-sha2-nistp256",
"keyval": {
"public": "044c7793ab74b9ddd713054e587b8d9c75c5f6025633d0fef7ca855ed5b8d5a474b23598fe33eb4a63630d526f74d4bdaec8adcb51993ed65652d651d7c49203eb"
},
"scheme": "ecdsa-sha2-nistp256"
}
},
"roles": {
"root": {
"keyids": [
"2f64fb5eac0cf94dd39bb45308b98920055e9a0d8e012a7220787834c60aef97",
"bdde902f5ec668179ff5ca0dabf7657109287d690bf97e230c21d65f99155c62",
"eaf22372f417dd618a46f6c627dbc276e9fd30a004fc94f9be946e73f8bd090b",
"f40f32044071a9365505da3d1e3be6561f6f22d0e60cf51df783999f6c3429cb",
"f505595165a177a41750a8e864ed1719b1edfccd5a426fd2c0ffda33ce7ff209"
],
"threshold": 3
},
"snapshot": {
"keyids": [
"fc61191ba8a516fe386c7d6c97d918e1d241e1589729add09b122725b8c32451"
],
"threshold": 1
},
"targets": {
"keyids": [
"2f64fb5eac0cf94dd39bb45308b98920055e9a0d8e012a7220787834c60aef97",
"bdde902f5ec668179ff5ca0dabf7657109287d690bf97e230c21d65f99155c62",
"eaf22372f417dd618a46f6c627dbc276e9fd30a004fc94f9be946e73f8bd090b",
"f40f32044071a9365505da3d1e3be6561f6f22d0e60cf51df783999f6c3429cb",
"f505595165a177a41750a8e864ed1719b1edfccd5a426fd2c0ffda33ce7ff209"
],
"threshold": 3
},
"timestamp": {
"keyids": [
"b6710623a30c010738e64c5209d367df1c0a18cf90e6ab5292fb01680f83453d"
],
"threshold": 1
}
},
"spec_version": "1.0",
"version": 2
}
}"#;
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