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Improve certificates issuance

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This commit is contained in:
Pierre HUBERT 2024-06-28 17:21:40 +02:00
parent 716e524bf4
commit 8bac181552
6 changed files with 134 additions and 78 deletions
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15
central_backend/src/app_config.rs
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@ -67,6 +67,11 @@ impl AppConfig {
self.pki_path().join("root_ca.pem")
}
/// Get PKI root CA CRL path
pub fn root_ca_crl_path(&self) -> PathBuf {
self.pki_path().join("root_ca.crl")
}
/// Get PKI root CA private key path
pub fn root_ca_priv_key_path(&self) -> PathBuf {
self.pki_path().join("root_ca.key")
@ -77,6 +82,11 @@ impl AppConfig {
self.pki_path().join("web_ca.pem")
}
/// Get PKI web CA CRL path
pub fn web_ca_crl_path(&self) -> PathBuf {
self.pki_path().join("web_ca.crl")
}
/// Get PKI web CA private key path
pub fn web_ca_priv_key_path(&self) -> PathBuf {
self.pki_path().join("web_ca.key")
@ -87,6 +97,11 @@ impl AppConfig {
self.pki_path().join("devices_ca.pem")
}
/// Get PKI devices CA CRL path
pub fn devices_ca_crl_path(&self) -> PathBuf {
self.pki_path().join("devices_ca.crl")
}
/// Get PKI devices CA private key path
pub fn devices_ca_priv_key_path(&self) -> PathBuf {
self.pki_path().join("devices_ca.key")

43
central_backend/src/crypto/crl_extension.rs Normal file
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@ -0,0 +1,43 @@
use asn1::Tag;
use openssl::asn1::{Asn1Object, Asn1OctetString};
use openssl::x509::X509Extension;
pub struct CRLDistributionPointExt {
pub url: String,
}
impl CRLDistributionPointExt {
pub fn as_extension(&self) -> anyhow::Result<X509Extension> {
let crl_obj = Asn1Object::from_str("2.5.29.31")?;
let tag_a0 = Tag::from_bytes(&[0xa0]).unwrap().0;
let tag_86 = Tag::from_bytes(&[0x86]).unwrap().0;
let crl_bytes = asn1::write(|w| {
w.write_element(&asn1::SequenceWriter::new(&|w| {
w.write_element(&asn1::SequenceWriter::new(&|w| {
w.write_tlv(tag_a0, |w| {
w.push_slice(&asn1::write(|w| {
w.write_tlv(tag_a0, |w| {
w.push_slice(&asn1::write(|w| {
w.write_tlv(tag_86, |b| b.push_slice(self.url.as_bytes()))?;
Ok(())
})?)
})?;
Ok(())
})?)
})?;
Ok(())
}))?;
Ok(())
}))
})?;
Ok(X509Extension::new_from_der(
crl_obj.as_ref(),
false,
Asn1OctetString::new_from_bytes(&crl_bytes)?.as_ref(),
)?)
}
}

2
central_backend/src/crypto/mod.rs Normal file
View File

@ -0,0 +1,2 @@
pub mod crl_extension;
pub mod pki;

146
central_backend/src/pki.rs → central_backend/src/crypto/pki.rs
View File

@ -1,29 +1,30 @@
use crate::app_config::AppConfig;
use asn1::{
parse_single, Asn1Readable, Asn1Writable, Explicit, Implicit, OctetStringEncoded, ParseResult,
SimpleAsn1Readable, SimpleAsn1Writable, Tag, WriteBuf, WriteResult, Writer,
};
use openssl::asn1::{Asn1Object, Asn1OctetString, Asn1OctetStringRef, Asn1Time};
use crate::crypto::crl_extension::CRLDistributionPointExt;
use openssl::asn1::Asn1Time;
use openssl::bn::{BigNum, MsbOption};
use openssl::ec::EcGroup;
use openssl::hash::MessageDigest;
use openssl::nid::Nid;
use openssl::pkey::{PKey, Private};
use openssl::x509;
use openssl::x509::extension::{BasicConstraints, KeyUsage, SubjectKeyIdentifier};
use openssl::x509::{X509Extension, X509NameBuilder, X509};
use std::path::Path;
use openssl::x509::{X509NameBuilder, X509};
use std::path::{Path, PathBuf};
/// Certificate and private key
struct CertAndKey(X509, PKey<Private>);
struct CertData {
cert: X509,
key: PKey<Private>,
crl: Option<PathBuf>,
}
impl CertAndKey {
impl CertData {
/// Load root CA
fn load_root_ca() -> anyhow::Result<Self> {
Ok(Self(
load_certificate_from_file(AppConfig::get().root_ca_cert_path())?,
load_priv_key_from_file(AppConfig::get().root_ca_priv_key_path())?,
))
Ok(Self {
cert: load_certificate_from_file(AppConfig::get().root_ca_cert_path())?,
key: load_priv_key_from_file(AppConfig::get().root_ca_priv_key_path())?,
crl: Some(AppConfig::get().root_ca_crl_path()),
})
}
}
@ -47,17 +48,21 @@ fn load_certificate_from_file<P: AsRef<Path>>(path: P) -> anyhow::Result<X509> {
Ok(X509::from_pem(&std::fs::read(path)?)?)
}
/// Generate intermediate or root CA
fn gen_intermediate_or_root_ca(
cn: &str,
issuer: Option<&CertAndKey>,
) -> anyhow::Result<(Vec<u8>, Vec<u8>)> {
#[derive(Default)]
struct GenCertificateReq<'a> {
cn: &'a str,
issuer: Option<&'a CertData>,
ca: bool,
}
/// Generate certificate
fn gen_certificate(req: GenCertificateReq) -> anyhow::Result<(Vec<u8>, Vec<u8>)> {
// Generate root private key
let key_pair = gen_private_key()?;
let mut x509_name = X509NameBuilder::new()?;
x509_name.append_entry_by_text("C", "FR")?;
x509_name.append_entry_by_text("CN", cn)?;
x509_name.append_entry_by_text("CN", req.cn)?;
let x509_name = x509_name.build();
let mut cert_builder = X509::builder()?;
@ -69,77 +74,58 @@ fn gen_intermediate_or_root_ca(
};
cert_builder.set_serial_number(&serial_number)?;
cert_builder.set_subject_name(&x509_name)?;
match issuer {
match req.issuer {
// Self-signed certificate
None => cert_builder.set_issuer_name(&x509_name)?,
// Certificate signed by another CA
Some(i) => cert_builder.set_issuer_name(i.0.issuer_name())?,
Some(i) => cert_builder.set_issuer_name(i.cert.issuer_name())?,
}
cert_builder.set_pubkey(&key_pair)?;
let not_before = Asn1Time::days_from_now(0)?;
cert_builder.set_not_before(&not_before)?;
let not_after = Asn1Time::days_from_now(365 * 30)?;
cert_builder.set_not_after(&not_after)?;
if let Some(issuer) = issuer {
let crl_url = format!(
"{}/crl/{}.crl",
AppConfig::get().unsecure_origin(),
"FIXME_TODO"
);
// Specify CRL URL
if let Some(issuer) = req.issuer {
if let Some(crl) = &issuer.crl {
let crl_url = format!(
"{}/crl/{}",
AppConfig::get().unsecure_origin(),
crl.file_name().unwrap().to_string_lossy()
);
let crl_obj = Asn1Object::from_str("2.5.29.31")?;
let TAG_A0 = Tag::from_bytes(&[0xa0]).unwrap().0;
let TAG_86 = Tag::from_bytes(&[0x86]).unwrap().0;
let crl_bytes = asn1::write(|w| {
w.write_element(&asn1::SequenceWriter::new(&|w| {
w.write_element(&asn1::SequenceWriter::new(&|w| {
w.write_tlv(TAG_A0, |w| {
w.push_slice(&asn1::write(|w| {
w.write_tlv(TAG_A0, |w| {
w.push_slice(&asn1::write(|w| {
w.write_tlv(TAG_86, |b| b.push_slice(crl_url.as_bytes()))?;
Ok(())
})?)
})?;
Ok(())
})?)
})?;
Ok(())
}))?;
Ok(())
}))
})?;
cert_builder.append_extension(X509Extension::new_from_der(
crl_obj.as_ref(),
false,
Asn1OctetString::new_from_bytes(&crl_bytes)?.as_ref(),
)?)?;
cert_builder
.append_extension(CRLDistributionPointExt { url: crl_url }.as_extension()?)?;
}
}
cert_builder.append_extension(BasicConstraints::new().critical().ca().build()?)?;
// If cert is a CA or not
if req.ca {
cert_builder.append_extension(BasicConstraints::new().critical().ca().build()?)?;
}
cert_builder.append_extension(
KeyUsage::new()
.critical()
.key_cert_sign()
.crl_sign()
.build()?,
)?;
// Key usage
let mut key_usage = KeyUsage::new();
if req.ca {
key_usage.key_cert_sign().crl_sign();
}
cert_builder.append_extension(key_usage.critical().build()?)?;
// Subject key identifier
let subject_key_identifier =
SubjectKeyIdentifier::new().build(&cert_builder.x509v3_context(None, None))?;
cert_builder.append_extension(subject_key_identifier)?;
// Sign certificate
cert_builder.sign(
match issuer {
match req.issuer {
None => &key_pair,
Some(i) => &i.1,
Some(i) => &i.key,
},
MessageDigest::sha256(),
)?;
@ -158,7 +144,11 @@ pub fn initialize_root_ca() -> anyhow::Result<()> {
log::info!("Generating root ca...");
let (key, cert) = gen_intermediate_or_root_ca("SolarEnergy Root CA", None)?;
let (key, cert) = gen_certificate(GenCertificateReq {
cn: "SolarEnergy Root CA",
issuer: None,
ca: true,
})?;
// Serialize generated web CA
std::fs::write(AppConfig::get().root_ca_priv_key_path(), key)?;
@ -177,8 +167,11 @@ pub fn initialize_web_ca() -> anyhow::Result<()> {
log::info!("Generating web ca...");
let (key, cert) =
gen_intermediate_or_root_ca("SolarEnergy Web CA", Some(&CertAndKey::load_root_ca()?))?;
let (key, cert) = gen_certificate(GenCertificateReq {
cn: "SolarEnergy Web CA",
issuer: Some(&CertData::load_root_ca()?),
ca: true,
})?;
// Serialize generated web CA
std::fs::write(AppConfig::get().web_ca_priv_key_path(), key)?;
@ -197,8 +190,11 @@ pub fn initialize_devices_ca() -> anyhow::Result<()> {
log::info!("Generating devices ca...");
let (key, cert) =
gen_intermediate_or_root_ca("SolarEnergy Devices CA", Some(&CertAndKey::load_root_ca()?))?;
let (key, cert) = gen_certificate(GenCertificateReq {
cn: "SolarEnergy Devices CA",
issuer: Some(&CertData::load_root_ca()?),
ca: true,
})?;
// Serialize generated devices CA
std::fs::write(AppConfig::get().devices_ca_priv_key_path(), key)?;

2
central_backend/src/lib.rs
View File

@ -1,3 +1,3 @@
pub mod app_config;
pub mod pki;
pub mod crypto;
pub mod utils;

4
central_backend/src/main.rs
View File

@ -1,12 +1,12 @@
use central_backend::app_config::AppConfig;
use central_backend::pki;
use central_backend::crypto::pki;
use central_backend::utils::files_utils::create_directory_if_missing;
fn main() {
env_logger::init_from_env(env_logger::Env::new().default_filter_or("info"));
// Initialize storage
create_directory_if_missing(&AppConfig::get().pki_path()).unwrap();
create_directory_if_missing(AppConfig::get().pki_path()).unwrap();
// Initialize PKI
pki::initialize_root_ca().expect("Failed to initialize Root CA!");