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//! A program that generates ca certs, certs verified by the ca, and public
//! and private keys.
use openssl::asn1::Asn1Time;
use openssl::bn::{BigNum, MsbOption};
use openssl::error::ErrorStack;
use openssl::hash::MessageDigest;
use openssl::pkey::{PKey, PKeyRef, Private};
use openssl::rsa::Rsa;
use openssl::x509::extension::{
AuthorityKeyIdentifier, BasicConstraints, KeyUsage, SubjectAlternativeName,
SubjectKeyIdentifier,
};
use openssl::x509::{X509NameBuilder, X509Ref, X509Req, X509ReqBuilder, X509VerifyResult, X509};
/// Make a CA certificate and private key
fn mk_ca_cert() -> Result<(X509, PKey<Private>), ErrorStack> {
let rsa = Rsa::generate(2048)?;
let privkey = PKey::from_rsa(rsa)?;
let mut x509_name = X509NameBuilder::new()?;
x509_name.append_entry_by_text("C", "US")?;
x509_name.append_entry_by_text("ST", "TX")?;
x509_name.append_entry_by_text("O", "Some CA organization")?;
x509_name.append_entry_by_text("CN", "ca test")?;
let x509_name = x509_name.build();
let mut cert_builder = X509::builder()?;
cert_builder.set_version(2)?;
let serial_number = {
let mut serial = BigNum::new()?;
serial.rand(159, MsbOption::MAYBE_ZERO, false)?;
serial.to_asn1_integer()?
};
cert_builder.set_serial_number(&serial_number)?;
cert_builder.set_subject_name(&x509_name)?;
cert_builder.set_issuer_name(&x509_name)?;
cert_builder.set_pubkey(&privkey)?;
let not_before = Asn1Time::days_from_now(0)?;
cert_builder.set_not_before(¬_before)?;
let not_after = Asn1Time::days_from_now(365)?;
cert_builder.set_not_after(¬_after)?;
cert_builder.append_extension(BasicConstraints::new().critical().ca().build()?)?;
cert_builder.append_extension(
KeyUsage::new()
.critical()
.key_cert_sign()
.crl_sign()
.build()?,
)?;
let subject_key_identifier =
SubjectKeyIdentifier::new().build(&cert_builder.x509v3_context(None, None))?;
cert_builder.append_extension(subject_key_identifier)?;
cert_builder.sign(&privkey, MessageDigest::sha256())?;
let cert = cert_builder.build();
Ok((cert, privkey))
}
/// Make a X509 request with the given private key
fn mk_request(privkey: &PKey<Private>) -> Result<X509Req, ErrorStack> {
let mut req_builder = X509ReqBuilder::new()?;
req_builder.set_pubkey(&privkey)?;
let mut x509_name = X509NameBuilder::new()?;
x509_name.append_entry_by_text("C", "US")?;
x509_name.append_entry_by_text("ST", "TX")?;
x509_name.append_entry_by_text("O", "Some organization")?;
x509_name.append_entry_by_text("CN", "www.example.com")?;
let x509_name = x509_name.build();
req_builder.set_subject_name(&x509_name)?;
req_builder.sign(&privkey, MessageDigest::sha256())?;
let req = req_builder.build();
Ok(req)
}
/// Make a certificate and private key signed by the given CA cert and private key
fn mk_ca_signed_cert(
ca_cert: &X509Ref,
ca_privkey: &PKeyRef<Private>,
) -> Result<(X509, PKey<Private>), ErrorStack> {
let rsa = Rsa::generate(2048)?;
let privkey = PKey::from_rsa(rsa)?;
let req = mk_request(&privkey)?;
let mut cert_builder = X509::builder()?;
cert_builder.set_version(2)?;
let serial_number = {
let mut serial = BigNum::new()?;
serial.rand(159, MsbOption::MAYBE_ZERO, false)?;
serial.to_asn1_integer()?
};
cert_builder.set_serial_number(&serial_number)?;
cert_builder.set_subject_name(req.subject_name())?;
cert_builder.set_issuer_name(ca_cert.subject_name())?;
cert_builder.set_pubkey(&privkey)?;
let not_before = Asn1Time::days_from_now(0)?;
cert_builder.set_not_before(¬_before)?;
let not_after = Asn1Time::days_from_now(365)?;
cert_builder.set_not_after(¬_after)?;
cert_builder.append_extension(BasicConstraints::new().build()?)?;
cert_builder.append_extension(
KeyUsage::new()
.critical()
.non_repudiation()
.digital_signature()
.key_encipherment()
.build()?,
)?;
let subject_key_identifier =
SubjectKeyIdentifier::new().build(&cert_builder.x509v3_context(Some(ca_cert), None))?;
cert_builder.append_extension(subject_key_identifier)?;
let auth_key_identifier = AuthorityKeyIdentifier::new()
.keyid(false)
.issuer(false)
.build(&cert_builder.x509v3_context(Some(ca_cert), None))?;
cert_builder.append_extension(auth_key_identifier)?;
let subject_alt_name = SubjectAlternativeName::new()
.dns("*.example.com")
.dns("hello.com")
.build(&cert_builder.x509v3_context(Some(ca_cert), None))?;
cert_builder.append_extension(subject_alt_name)?;
cert_builder.sign(&ca_privkey, MessageDigest::sha256())?;
let cert = cert_builder.build();
Ok((cert, privkey))
}
fn real_main() -> Result<(), ErrorStack> {
let (ca_cert, ca_privkey) = mk_ca_cert()?;
let (cert, _privkey) = mk_ca_signed_cert(&ca_cert, &ca_privkey)?;
// Verify that this cert was issued by this ca
match ca_cert.issued(&cert) {
X509VerifyResult::OK => println!("Certificate verified!"),
ver_err => println!("Failed to verify certificate: {}", ver_err),
};
Ok(())
}
fn main() {
match real_main() {
Ok(()) => println!("Finished."),
Err(e) => println!("Error: {}", e),
};
}
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