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lib.rs
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/*!
Rust X.509 certificate generation utility
This crate provides a way to generate self signed X.509 certificates.
The most simple way of using this crate is by calling the
`generate_simple_self_signed` function.
For more customization abilities, we provide the lower level
`Certificate::from_params` function.
## Example
```
extern crate rcgen;
use rcgen::generate_simple_self_signed;
# fn main () {
// Generate a certificate that's valid for "localhost" and "hello.world.example"
let subject_alt_names = vec!["hello.world.example".to_string(),
"localhost".to_string()];
let cert = generate_simple_self_signed(subject_alt_names).unwrap();
println!("{}", cert.serialize_pem().unwrap());
println!("{}", cert.serialize_private_key_pem());
# }
```
*/
#![forbid(unsafe_code)]
#![deny(missing_docs)]
extern crate yasna;
extern crate ring;
#[cfg(feature = "pem")]
extern crate pem;
extern crate chrono;
use yasna::Tag;
use yasna::models::ObjectIdentifier;
#[cfg(feature = "pem")]
use pem::Pem;
#[cfg(feature = "pem")]
use std::convert::TryInto;
use ring::digest;
use ring::signature::{EcdsaKeyPair, Ed25519KeyPair, RsaKeyPair};
use ring::rand::SystemRandom;
use ring::signature::KeyPair as RingKeyPair;
use ring::signature::{self, EcdsaSigningAlgorithm, EdDSAParameters};
use yasna::DERWriter;
use yasna::models::{GeneralizedTime, UTCTime};
use chrono::{DateTime, Timelike, Datelike};
use chrono::{NaiveDate, Utc};
use std::collections::HashMap;
use std::fmt;
use std::convert::TryFrom;
use std::error::Error;
use std::net::IpAddr;
use std::str::FromStr;
/// A self signed certificate together with signing keys
pub struct Certificate {
params :CertificateParams,
key_pair :KeyPair,
}
/**
KISS function to generate a self signed certificate
Given a set of domain names you want your certificate to be valid for,
this function fills in the other generation parameters with
reasonable defaults and generates a self signed certificate
as output.
## Example
```
extern crate rcgen;
use rcgen::generate_simple_self_signed;
# fn main () {
let subject_alt_names :&[_] = &["hello.world.example".to_string(),
"localhost".to_string()];
let cert = generate_simple_self_signed(subject_alt_names).unwrap();
// The certificate is now valid for localhost and the domain "hello.world.example"
println!("{}", cert.serialize_pem().unwrap());
println!("{}", cert.serialize_private_key_pem());
# }
```
*/
pub fn generate_simple_self_signed(subject_alt_names :impl Into<Vec<String>>) -> Result<Certificate, RcgenError> {
Certificate::from_params(CertificateParams::new(subject_alt_names))
}
// https://tools.ietf.org/html/rfc5280#section-4.1.1
// Example certs usable as reference:
// Uses ECDSA: https://crt.sh/?asn1=607203242
/// pkcs-9-at-extensionRequest in RFC 2985
const OID_PKCS_9_AT_EXTENSION_REQUEST :&[u64] = &[1, 2, 840, 113549, 1, 9, 14];
/// id-at-countryName in RFC 5820
const OID_COUNTRY_NAME :&[u64] = &[2, 5, 4, 6];
/// id-at-localityName in RFC 5820
const OID_LOCALITY_NAME :&[u64] = &[2, 5, 4, 7];
/// id-at-stateOrProvinceName in RFC 5820
const OID_STATE_OR_PROVINCE_NAME :&[u64] = &[2, 5, 4, 8];
/// id-at-organizationName in RFC 5820
const OID_ORG_NAME :&[u64] = &[2, 5, 4, 10];
/// id-at-organizationalUnitName in RFC 5820
const OID_ORG_UNIT_NAME :&[u64] = &[2, 5, 4, 11];
/// id-at-commonName in RFC 5820
const OID_COMMON_NAME :&[u64] = &[2, 5, 4, 3];
// https://tools.ietf.org/html/rfc5480#section-2.1.1
const OID_EC_PUBLIC_KEY :&[u64] = &[1, 2, 840, 10045, 2, 1];
const OID_EC_SECP_256_R1 :&[u64] = &[1, 2, 840, 10045, 3, 1, 7];
const OID_EC_SECP_384_R1 :&[u64] = &[1, 3, 132, 0, 34];
// rsaEncryption in RFC 4055
const OID_RSA_ENCRYPTION :&[u64] = &[1, 2, 840, 113549, 1, 1, 1];
// https://tools.ietf.org/html/rfc5280#appendix-A.2
// https://tools.ietf.org/html/rfc5280#section-4.2.1.6
const OID_SUBJECT_ALT_NAME :&[u64] = &[2, 5, 29, 17];
// https://tools.ietf.org/html/rfc5280#section-4.2.1.9
const OID_BASIC_CONSTRAINTS :&[u64] = &[2, 5, 29, 19];
// https://tools.ietf.org/html/rfc5280#section-4.2.1.2
const OID_SUBJECT_KEY_IDENTIFIER :&[u64] = &[2, 5, 29, 14];
// https://tools.ietf.org/html/rfc5280#section-4.2.1.1
const OID_AUTHORITY_KEY_IDENTIFIER :&[u64] = &[2, 5, 29, 35];
// id-ce-extKeyUsage in
// https://tools.ietf.org/html/rfc5280#section-4.2.1.12
const OID_EXT_KEY_USAGE :&[u64] = &[2, 5, 29, 37];
// id-ce-nameConstraints in
/// https://tools.ietf.org/html/rfc5280#section-4.2.1.10
const OID_NAME_CONSTRAINTS :&[u64] = &[2, 5, 29, 30];
// id-pe-acmeIdentifier in
// https://www.iana.org/assignments/smi-numbers/smi-numbers.xhtml#smi-numbers-1.3.6.1.5.5.7.1
const OID_PE_ACME :&[u64] = &[1, 3, 6, 1, 5, 5, 7, 1, 31];
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
#[allow(missing_docs)]
#[non_exhaustive]
/// The type of subject alt name
pub enum SanType {
/// Also known as E-Mail address
Rfc822Name(String),
DnsName(String),
IpAddress(IpAddr),
}
impl SanType {
fn tag(&self) -> u64 {
// Defined in the GeneralName list in
// https://tools.ietf.org/html/rfc5280#page-38
const TAG_RFC822_NAME :u64 = 1;
const TAG_DNS_NAME :u64 = 2;
const TAG_IP_ADDRESS :u64 = 7;
match self {
SanType::Rfc822Name(_name) => TAG_RFC822_NAME,
SanType::DnsName(_name) => TAG_DNS_NAME,
SanType::IpAddress(_addr) => TAG_IP_ADDRESS,
}
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
#[allow(missing_docs)]
#[non_exhaustive]
/// General Subtree type.
///
/// This type has similarities to the `SanType` enum but is not equal.
/// For example, `GeneralSubtree` has CIDR subnets for ip addresses
/// while `SanType` has IP addresses.
pub enum GeneralSubtree {
/// Also known as E-Mail address
Rfc822Name(String),
DnsName(String),
DirectoryName(DistinguishedName),
IpAddress(CidrSubnet),
}
impl GeneralSubtree {
fn tag(&self) -> u64 {
// Defined in the GeneralName list in
// https://tools.ietf.org/html/rfc5280#page-38
const TAG_RFC822_NAME :u64 = 1;
const TAG_DNS_NAME :u64 = 2;
const TAG_DIRECTORY_NAME :u64 = 4;
const TAG_IP_ADDRESS :u64 = 7;
match self {
GeneralSubtree::Rfc822Name(_name) => TAG_RFC822_NAME,
GeneralSubtree::DnsName(_name) => TAG_DNS_NAME,
GeneralSubtree::DirectoryName(_name) => TAG_DIRECTORY_NAME,
GeneralSubtree::IpAddress(_addr) => TAG_IP_ADDRESS,
}
}
}
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
#[allow(missing_docs)]
/// CIDR subnet, as per [RFC 4632](https://tools.ietf.org/html/rfc4632)
///
/// You might know CIDR subnets better by their textual representation
/// where they consist of an ip address followed by a slash and a prefix
/// number, for example `192.168.99.0/24`.
///
/// The first field in the enum is the address, the second is the mask.
/// Both are specified in network byte order.
pub enum CidrSubnet {
V4([u8; 4], [u8; 4]),
V6([u8; 16], [u8; 16]),
}
macro_rules! mask {
($t:ty, $d:expr) => {{
let v = <$t>::max_value();
let v = v.checked_shr($d as u32).unwrap_or(0);
(!v).to_be_bytes()
}};
}
impl CidrSubnet {
/// Obtains the CidrSubnet from the well-known
/// addr/prefix notation.
/// ```
/// # use std::str::FromStr;
/// # use rcgen::CidrSubnet;
/// // The "192.0.2.0/24" example from
/// // https://tools.ietf.org/html/rfc5280#page-42
/// let subnet = CidrSubnet::from_str("192.0.2.0/24").unwrap();
/// assert_eq!(subnet, CidrSubnet::V4([0xC0, 0x00, 0x02, 0x00], [0xFF, 0xFF, 0xFF, 0x00]));
/// ```
pub fn from_str(s :&str) -> Result<Self, ()> {
let mut iter = s.split("/");
if let (Some(addr_s), Some(prefix_s)) = (iter.next(), iter.next()) {
let addr = IpAddr::from_str(addr_s).map_err(|_| ())?;
let prefix = u8::from_str(prefix_s).map_err(|_| ())?;
Ok(Self::from_addr_prefix(addr, prefix))
} else {
Err(())
}
}
/// Obtains the CidrSubnet from an ip address
/// as well as the specified prefix number.
///
/// ```
/// # use std::net::IpAddr;
/// # use std::str::FromStr;
/// # use rcgen::CidrSubnet;
/// // The "192.0.2.0/24" example from
/// // https://tools.ietf.org/html/rfc5280#page-42
/// let addr = IpAddr::from_str("192.0.2.0").unwrap();
/// let subnet = CidrSubnet::from_addr_prefix(addr, 24);
/// assert_eq!(subnet, CidrSubnet::V4([0xC0, 0x00, 0x02, 0x00], [0xFF, 0xFF, 0xFF, 0x00]));
/// ```
pub fn from_addr_prefix(addr :IpAddr, prefix :u8) -> Self {
match addr {
IpAddr::V4(addr) => {
Self::from_v4_prefix(addr.octets(), prefix)
},
IpAddr::V6(addr) => {
Self::from_v6_prefix(addr.octets(), prefix)
},
}
}
/// Obtains the CidrSubnet from an IPv4 address in network byte order
/// as well as the specified prefix.
pub fn from_v4_prefix(addr :[u8; 4], prefix :u8) -> Self {
CidrSubnet::V4(addr, mask!(u32, prefix))
}
/// Obtains the CidrSubnet from an IPv6 address in network byte order
/// as well as the specified prefix.
pub fn from_v6_prefix(addr :[u8; 16], prefix :u8) -> Self {
CidrSubnet::V6(addr, mask!(u128, prefix))
}
fn to_bytes(&self) -> Vec<u8> {
let mut res = Vec::new();
match self {
CidrSubnet::V4(addr, mask) => {
res.extend_from_slice(addr);
res.extend_from_slice(mask);
},
CidrSubnet::V6(addr, mask) => {
res.extend_from_slice(addr);
res.extend_from_slice(mask);
},
}
res
}
}
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
#[non_exhaustive]
/// The attribute type of a distinguished name entry
pub enum DnType {
/// X520countryName
CountryName,
/// X520LocalityName
LocalityName,
/// X520StateOrProvinceName
StateOrProvinceName,
/// X520OrganizationName
OrganizationName,
/// X520OrganizationalUnitName
OrganizationalUnitName,
/// X520CommonName
CommonName,
/// Custom distinguished name type
CustomDnType(Vec<u64>),
}
impl DnType {
fn to_oid(&self) -> ObjectIdentifier {
let sl = match self {
DnType::CountryName => OID_COUNTRY_NAME,
DnType::LocalityName => OID_LOCALITY_NAME,
DnType::StateOrProvinceName => OID_STATE_OR_PROVINCE_NAME,
DnType::OrganizationName => OID_ORG_NAME,
DnType::OrganizationalUnitName => OID_ORG_UNIT_NAME,
DnType::CommonName => OID_COMMON_NAME,
DnType::CustomDnType(ref oid) => oid.as_slice(),
};
ObjectIdentifier::from_slice(sl)
}
/// Generate a DnType for the provided OID
pub fn from_oid(slice :&[u64]) -> Self {
match slice {
OID_COUNTRY_NAME => DnType::CountryName,
OID_LOCALITY_NAME => DnType::LocalityName,
OID_STATE_OR_PROVINCE_NAME => DnType::StateOrProvinceName,
OID_ORG_NAME => DnType::OrganizationName,
OID_ORG_UNIT_NAME => DnType::OrganizationalUnitName,
OID_COMMON_NAME => DnType::CommonName,
oid => DnType::CustomDnType(oid.into())
}
}
}
#[derive(Debug, PartialEq, Eq, Clone)]
/**
Distinguished name used e.g. for the issuer and subject fields of a certificate
A distinguished name is a set of (attribute type, attribute value) tuples.
This datastructure keeps them ordered by insertion order.
See also the RFC 5280 sections on the [issuer](https://tools.ietf.org/html/rfc5280#section-4.1.2.4)
and [subject](https://tools.ietf.org/html/rfc5280#section-4.1.2.6) fields.
*/
pub struct DistinguishedName {
entries :HashMap<DnType, String>,
order :Vec<DnType>,
}
impl DistinguishedName {
/// Creates a new, empty distinguished name
pub fn new() -> Self {
Self {
entries : HashMap::new(),
order : Vec::new(),
}
}
/// Obtains the attribute value for the given attribute type
pub fn get(&self, ty :&DnType) -> Option<&str> {
self.entries.get(ty).map(|s| {
let s :&str = s;
s
})
}
/// Removes the attribute with the specified DnType
///
/// Returns true when an actual removal happened, false
/// when no attribute with the specified DnType was
/// found.
pub fn remove(&mut self, ty :DnType) -> bool {
let removed = self.entries.remove(&ty).is_some();
if removed {
self.order.retain(|ty_o| &ty != ty_o);
}
removed
}
/// Inserts or updates an attribute that consists of type and name
pub fn push(&mut self, ty :DnType, s :impl Into<String>) {
if !self.entries.contains_key(&ty) {
self.order.push(ty.clone());
}
self.entries.insert(ty, s.into());
}
/// Iterate over the entries
pub fn iter(&self) -> DistinguishedNameIterator<'_> {
DistinguishedNameIterator {
distinguished_name :self,
iter :self.order.iter()
}
}
}
/**
Iterator over `DistinguishedName` entries
*/
pub struct DistinguishedNameIterator<'a> {
distinguished_name :&'a DistinguishedName,
iter :std::slice::Iter<'a, DnType>,
}
impl <'a> Iterator for DistinguishedNameIterator<'a> {
type Item = (&'a DnType, &'a str);
fn next(&mut self) -> Option<Self::Item> {
self.iter.next()
.and_then(|ty| {
self.distinguished_name.entries.get(ty).map(|v| (ty, v.as_str()))
})
}
}
/// Parameters used for certificate generation
#[allow(missing_docs)]
#[non_exhaustive]
pub struct CertificateParams {
pub alg :&'static SignatureAlgorithm,
pub not_before :DateTime<Utc>,
pub not_after :DateTime<Utc>,
pub serial_number :Option<u64>,
pub subject_alt_names :Vec<SanType>,
pub distinguished_name :DistinguishedName,
pub is_ca :IsCa,
pub extended_key_usages :Vec<ExtendedKeyUsagePurpose>,
pub name_constraints :Option<NameConstraints>,
pub custom_extensions :Vec<CustomExtension>,
/// The certificate's key pair, a new random key pair will be generated if this is `None`
pub key_pair :Option<KeyPair>,
/// If `true` (and not self-signed), the 'Authority Key Identifier' extension will be added to the generated cert
pub use_authority_key_identifier_extension :bool,
/// Method to generate key identifiers from public keys
///
/// Defaults to SHA-256.
pub key_identifier_method :KeyIdMethod,
}
impl Default for CertificateParams {
fn default() -> Self {
// not_before and not_after set to reasonably long dates
let not_before = date_time_ymd(1975, 01, 01);
let not_after = date_time_ymd(4096, 01, 01);
let mut distinguished_name = DistinguishedName::new();
distinguished_name.push(DnType::CommonName, "rcgen self signed cert");
CertificateParams {
alg : &PKCS_ECDSA_P256_SHA256,
not_before,
not_after,
serial_number : None,
subject_alt_names : Vec::new(),
distinguished_name,
is_ca : IsCa::SelfSignedOnly,
extended_key_usages : Vec::new(),
name_constraints : None,
custom_extensions : Vec::new(),
key_pair : None,
use_authority_key_identifier_extension : false,
key_identifier_method : KeyIdMethod::Sha256,
}
}
}
impl CertificateParams {
/// Parses the ca certificate from the ASCII PEM format
///
/// See `from_ca_cert_der` for more details.
#[cfg(all(feature = "pem", feature = "x509-parser"))]
pub fn from_ca_cert_pem(pem_str :&str, key_pair :KeyPair) -> Result<Self, RcgenError> {
let certificate = pem::parse(pem_str)
.or(Err(RcgenError::CouldNotParseCertificate))?;
Self::from_ca_cert_der(&certificate.contents, key_pair)
}
/// Parses the ca certificate from the DER format
///
/// This function is only of use if you have an existing ca certificate with which
/// you want to sign a certificate newly generated by `rcgen` using the
/// `serialize_der_with_signer()` or `serialize_pem_with_signer()` functions.
///
/// Will not check if certificate is a ca certificate!
#[cfg(feature = "x509-parser")]
pub fn from_ca_cert_der(ca_cert :&[u8], key_pair :KeyPair) -> Result<Self, RcgenError> {
let (_remainder, x509) = x509_parser::parse_x509_der(ca_cert)
.or(Err(RcgenError::CouldNotParseCertificate))?;
let alg = SignatureAlgorithm::from_oid(x509.signature_algorithm.algorithm.iter().as_slice())?;
let mut dn = DistinguishedName::new();
for rdn in x509.tbs_certificate.subject.rdn_seq.iter() {
assert!(rdn.set.len() != 0, "x509-parser distinguished name set is empty");
let attr = if rdn.set.len() > 1 {
// no support for distinguished names with more than one attribute
return Err(RcgenError::CouldNotParseCertificate);
} else {
&rdn.set.as_slice()[0]
};
let value = attr.attr_value.as_slice()
.or(Err(RcgenError::CouldNotParseCertificate))?;
let dn_type = DnType::from_oid(attr.attr_type.iter().as_slice());
let dn_value = String::from_utf8(value.into())
.or(Err(RcgenError::CouldNotParseCertificate))?;
dn.push(dn_type, dn_value);
}
Ok(
CertificateParams {
alg,
distinguished_name : dn,
key_pair : Some(key_pair),
.. Default::default()
}
)
}
}
/// Whether the certificate is allowed to sign other certificates
pub enum IsCa {
/// The certificate can only sign itself
SelfSignedOnly,
/// The certificate may be used to sign other certificates
Ca(BasicConstraints),
}
/// The path length constraint (only relevant for CA certificates)
///
/// Sets an optional upper limit on the length of the intermediate certificate chain
/// length allowed for this CA certificate (not including the end entity certificate).
pub enum BasicConstraints {
/// No constraint
Unconstrained,
/// Constrain to the contained number of intermediate certificates
Constrained(u8),
}
impl CertificateParams {
/// Generate certificate parameters with reasonable defaults
pub fn new(subject_alt_names :impl Into<Vec<String>>) -> Self {
let subject_alt_names = subject_alt_names.into()
.into_iter()
.map(|s| SanType::DnsName(s))
.collect::<Vec<_>>();
CertificateParams {
subject_alt_names,
.. Default::default()
}
}
}
/// The [NameConstraints extension](https://tools.ietf.org/html/rfc5280#section-4.2.1.10)
/// (only relevant for CA certificates)
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct NameConstraints {
/// If non-empty, a whitelist of subtrees that the
/// domain has to match.
pub permitted_subtrees :Vec<GeneralSubtree>,
/// A list of excluded subtrees.
///
/// Any name matching an excluded subtree is invalid
/// even if it also matches a permitted subtree.
pub excluded_subtrees :Vec<GeneralSubtree>,
}
impl NameConstraints {
fn is_empty(&self) -> bool {
self.permitted_subtrees.is_empty() && self.excluded_subtrees.is_empty()
}
}
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
/// One of the purposes contained in the [extended key usage extension](https://tools.ietf.org/html/rfc5280#section-4.2.1.12)
pub enum ExtendedKeyUsagePurpose {
/// anyExtendedKeyUsage
Any,
/// id-kp-serverAuth
ServerAuth,
/// id-kp-clientAuth
ClientAuth,
/// id-kp-codeSigning
CodeSigning,
/// id-kp-emailProtection
EmailProtection,
/// id-kp-timeStamping
TimeStamping,
/// id-kp-OCSPSigning
OcspSigning,
}
impl ExtendedKeyUsagePurpose {
fn oid(&self) -> &'static [u64] {
use ExtendedKeyUsagePurpose::*;
match self {
// anyExtendedKeyUsage
Any => &[2, 5, 29, 37],
// id-kp-*
ServerAuth => &[1, 3, 6, 1, 5, 5, 7, 3, 1],
ClientAuth => &[1, 3, 6, 1, 5, 5, 7, 3, 2],
CodeSigning => &[1, 3, 6, 1, 5, 5, 7, 3, 3],
EmailProtection => &[1, 3, 6, 1, 5, 5, 7, 3, 4],
TimeStamping => &[1, 3, 6, 1, 5, 5, 7, 3, 8],
OcspSigning => &[1, 3, 6, 1, 5, 5, 7, 3, 9],
}
}
}
/// A custom extension of a certificate, as specified in
/// [RFC 5280](https://tools.ietf.org/html/rfc5280#section-4.2)
pub struct CustomExtension {
oid :Vec<u64>,
critical :bool,
/// The content must be DER-encoded
content :Vec<u8>,
}
impl CustomExtension {
/// Creates a new acmeIdentifier extension for ACME TLS-ALPN-01
/// as specified in [draft-ietf-acme-tls-alpn-06](https://tools.ietf.org/html/draft-ietf-acme-tls-alpn-06#section-3)
///
/// Panics if the passed `sha_digest` parameter doesn't hold 32 bytes (256 bits).
pub fn new_acme_identifier(sha_digest :&[u8]) -> Self {
assert_eq!(sha_digest.len(), 32, "wrong size of sha_digest");
let content = yasna::construct_der(|writer| {
writer.write_bytes(sha_digest);
});
Self {
oid : OID_PE_ACME.to_owned(),
critical : true,
content,
}
}
/// Create a new custom extension
pub fn from_oid_content(oid :&[u64], content :Vec<u8>) -> Self {
Self {
oid : oid.to_owned(),
critical : false,
content,
}
}
/// Sets the criticality flag of the extension.
pub fn set_criticality(&mut self, criticality :bool) {
self.critical = criticality;
}
}
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
#[non_exhaustive]
/// Method to generate key identifiers from public keys.
///
/// This allows choice over methods to generate key identifiers
/// as specified in RFC 7093 section 2.
pub enum KeyIdMethod {
/// RFC 7093 method 1
Sha256,
/// RFC 7093 method 2
Sha384,
/// RFC 7093 method 3
Sha512,
}
/// Helper to obtain a DateTime from year, month, day values
///
/// The year, month, day values are assumed to be in UTC.
///
/// This helper function serves two purposes: first, so that you don't
/// have to import the chrono crate yourself in order to specify date
/// information, second so that users don't have to type unproportionately
/// long code just to generate an instance of `DateTime<Utc>`.
pub fn date_time_ymd(year :i32, month :u32, day :u32) -> DateTime<Utc> {
let naive_dt = NaiveDate::from_ymd(year, month, day).and_hms_milli(0, 0, 0, 0);
DateTime::<Utc>::from_utc(naive_dt, Utc)
}
fn dt_to_generalized(dt :&DateTime<Utc>) -> Result<GeneralizedTime, RcgenError> {
let mut date_time = *dt;
// Set nanoseconds to zero (or to one leap second if there is a leap second)
// This is needed because the GeneralizedTime serializer would otherwise
// output fractional values which RFC 5820 explicitly forbode [1].
// [1]: https://tools.ietf.org/html/rfc5280#section-4.1.2.5.2
let nanos = if date_time.nanosecond() >= 1_000_000_000 {
1_000_000_000
} else {
0
};
date_time = date_time.with_nanosecond(nanos).ok_or(RcgenError::Time)?;
Ok(GeneralizedTime::from_datetime::<Utc>(&date_time))
}
fn write_dt_utc_or_generalized(writer :DERWriter, dt :&DateTime<Utc>) -> Result<(), RcgenError> {
// RFC 5280 requires CAs to write certificate validity dates
// below 2050 as UTCTime, and anything starting from 2050
// as GeneralizedTime [1]. The RFC doesn't say anything
// about dates before 1950, but as UTCTime can't represent
// them, we have to use GeneralizedTime if we want to or not.
// [1]: https://tools.ietf.org/html/rfc5280#section-4.1.2.5
if (1950 .. 2050).contains(&dt.year()) {
let ut = UTCTime::from_datetime::<Utc>(dt);
writer.write_utctime(&ut);
} else {
let gt = dt_to_generalized(dt)?;
writer.write_generalized_time(>);
}
Ok(())
}
fn write_distinguished_name(writer :DERWriter, dn :&DistinguishedName) {
writer.write_sequence(|writer| {
for (ty, content) in dn.iter() {
writer.next().write_set(|writer| {
writer.next().write_sequence(|writer| {
writer.next().write_oid(&ty.to_oid());
writer.next().write_utf8_string(content);
});
});
}
});
}
fn write_general_subtrees(writer :DERWriter, tag :u64, general_subtrees :&[GeneralSubtree]) {
writer.write_tagged_implicit(Tag::context(tag), |writer| {
writer.write_sequence(|writer| {
for subtree in general_subtrees.iter() {
writer.next().write_sequence(|writer| {
writer.next().write_tagged_implicit(Tag::context(subtree.tag()), |writer| {
match subtree {
GeneralSubtree::Rfc822Name(name) |
GeneralSubtree::DnsName(name) => writer.write_utf8_string(name),
GeneralSubtree::DirectoryName(name) => write_distinguished_name(writer, name),
GeneralSubtree::IpAddress(subnet) => writer.write_bytes(&subnet.to_bytes()),
}
});
// minimum must be 0 (the default) and maximum must be absent
});
}
});
});
}
impl Certificate {
/// Generates a new certificate from the given parameters
pub fn from_params(mut params :CertificateParams) -> Result<Self, RcgenError> {
let key_pair = if let Some(key_pair) = params.key_pair.take() {
if !key_pair.is_compatible(¶ms.alg) {
return Err(RcgenError::CertificateKeyPairMismatch);
}
key_pair
} else {
KeyPair::generate(¶ms.alg)?
};
Ok(Certificate {
params,
key_pair,
})
}
fn write_subject_alt_names(&self, writer :DERWriter) {
Self::write_extension(writer, OID_SUBJECT_ALT_NAME, false, |writer| {
writer.write_sequence(|writer| {
for san in self.params.subject_alt_names.iter() {
writer.next().write_tagged_implicit(Tag::context(san.tag()), |writer| {
match san {
SanType::Rfc822Name(name) |
SanType::DnsName(name) => writer.write_utf8_string(name),
SanType::IpAddress(IpAddr::V4(addr)) => writer.write_bytes(&addr.octets()),
SanType::IpAddress(IpAddr::V6(addr)) => writer.write_bytes(&addr.octets()),
}
});
}
});
});
}
fn write_request(&self, writer :DERWriter) {
writer.write_sequence(|writer| {
// Write version
writer.next().write_u8(0);
// Write issuer
writer.next().write_sequence(|writer| {
for (ty, content) in self.params.distinguished_name.iter() {
writer.next().write_set(|writer| {
writer.next().write_sequence(|writer| {
writer.next().write_oid(&ty.to_oid());
writer.next().write_utf8_string(content);
});
});
}
});
// Write subjectPublicKeyInfo
self.key_pair.serialize_public_key_der(writer.next());
// Write extensions
// According to the spec in RFC 2986, even if attributes are empty we need the empty attribute tag
writer.next().write_tagged(Tag::context(0), |writer| {
if !self.params.subject_alt_names.is_empty() {
writer.write_sequence(|writer| {
let oid = ObjectIdentifier::from_slice(OID_PKCS_9_AT_EXTENSION_REQUEST);
writer.next().write_oid(&oid);
writer.next().write_set(|writer| {
writer.next().write_sequence(|writer| {
// Write subject_alt_names
self.write_subject_alt_names(writer.next());
});
});
});
}
});
});
}
fn write_cert(&self, writer :DERWriter, ca :&Certificate) -> Result<(), RcgenError> {
writer.write_sequence(|writer| {
// Write version
writer.next().write_tagged(Tag::context(0), |writer| {
writer.write_u8(2);
});
// Write serialNumber
let serial = self.params.serial_number.unwrap_or(42);
writer.next().write_u64(serial);
// Write signature
self.params.alg.write_alg_ident(writer.next());
// Write issuer
write_distinguished_name(writer.next(), &ca.params.distinguished_name);
// Write validity
writer.next().write_sequence(|writer| {
// Not before
write_dt_utc_or_generalized(writer.next(), &self.params.not_before)?;
// Not after
write_dt_utc_or_generalized(writer.next(), &self.params.not_after)?;
Ok::<(), RcgenError>(())
})?;
// Write subject
write_distinguished_name(writer.next(), &self.params.distinguished_name);
// Write subjectPublicKeyInfo
self.key_pair.serialize_public_key_der(writer.next());
// write extensions
let not_self_signed = ca.key_pair.public_key_raw() != self.key_pair.public_key_raw();
let should_write_exts = (not_self_signed && self.params.use_authority_key_identifier_extension) ||
!self.params.subject_alt_names.is_empty() ||
!self.params.extended_key_usages.is_empty() ||
self.params.name_constraints.iter().any(|c| !c.is_empty()) ||
matches!(self.params.is_ca, IsCa::Ca(_)) ||
!self.params.custom_extensions.is_empty();
if should_write_exts {
writer.next().write_tagged(Tag::context(3), |writer| {
writer.write_sequence(|writer| {
if not_self_signed && self.params.use_authority_key_identifier_extension {
// Write Authority Key Identifier (when issued by a CA)
// RFC 5280 states:
// 'The keyIdentifier field of the authorityKeyIdentifier extension MUST
// be included in all certificates generated by conforming CAs to
// facilitate certification path construction. There is one exception;
// where a CA distributes its public key in the form of a "self-signed"
// certificate, the authority key identifier MAY be omitted.'
Self::write_extension(writer.next(), OID_AUTHORITY_KEY_IDENTIFIER, false, |writer| {
writer.write_sequence(|writer| {
writer.next().write_tagged_implicit(Tag::context(0), |writer| {
writer.write_bytes(ca.get_key_identifier().as_ref())
})
});
});
}
// Write subject_alt_names
if !self.params.subject_alt_names.is_empty() {
self.write_subject_alt_names(writer.next());
}
// Write extended key usage
if !self.params.extended_key_usages.is_empty() {
Self::write_extension(writer.next(), OID_EXT_KEY_USAGE, false, |writer| {
writer.write_sequence(|writer| {
for usage in self.params.extended_key_usages.iter() {
let oid = ObjectIdentifier::from_slice(usage.oid());
writer.next().write_oid(&oid);
}
});
});
}
if let Some(name_constraints) = &self.params.name_constraints {
// If both trees are empty, the extension must be omitted.
if !name_constraints.is_empty() {
Self::write_extension(writer.next(), OID_NAME_CONSTRAINTS, true, |writer| {
writer.write_sequence(|writer| {
if !name_constraints.permitted_subtrees.is_empty() {
write_general_subtrees(writer.next(), 0, &name_constraints.permitted_subtrees);
}
if !name_constraints.excluded_subtrees.is_empty() {
write_general_subtrees(writer.next(), 1, &name_constraints.excluded_subtrees);
}
});
});
}
}
if let IsCa::Ca(ref constraint) = self.params.is_ca {
// Write subject_key_identifier
Self::write_extension(writer.next(), OID_SUBJECT_KEY_IDENTIFIER, false, |writer| {
let key_identifier = self.get_key_identifier();
writer.write_bytes(key_identifier.as_ref());
});
// Write basic_constraints
Self::write_extension(writer.next(), OID_BASIC_CONSTRAINTS, true, |writer| {
writer.write_sequence(|writer| {
writer.next().write_bool(true); // cA flag
if let BasicConstraints::Constrained(path_len_constraint) = constraint {
writer.next().write_u8(*path_len_constraint);
}
});
});
}
// Write the custom extensions
for ext in &self.params.custom_extensions {
writer.next().write_sequence(|writer| {
let oid = ObjectIdentifier::from_slice(&ext.oid);
writer.next().write_oid(&oid);
// If the extension is critical, we should signal this.
// It's false by default so we don't need to write anything
// if the extension is not critical.
if ext.critical {
writer.next().write_bool(true);
}
writer.next().write_bytes(&ext.content);
});
}
});
});
}
Ok(())
})
}
/// Serializes an X.509v3 extension according to RFC 5280
fn write_extension(writer :DERWriter, extension_oid :&[u64], is_critical :bool, value_serializer :impl FnOnce(DERWriter)) {
// Extension specification:
// Extension ::= SEQUENCE {
// extnID OBJECT IDENTIFIER,
// critical BOOLEAN DEFAULT FALSE,
// extnValue OCTET STRING
// -- contains the DER encoding of an ASN.1 value
// -- corresponding to the extension type identified
// -- by extnID
// }
writer.write_sequence(|writer| {
let oid = ObjectIdentifier::from_slice(extension_oid);
writer.next().write_oid(&oid);
if is_critical {
writer.next().write_bool(true);
}
let bytes = yasna::construct_der(value_serializer);
writer.next().write_bytes(&bytes);
})
}
/// Calculates a subject key identifier for the certificate subject's public key.
/// This key identifier is used in the SubjectKeyIdentifier X.509v3 extension.
pub fn get_key_identifier(&self) -> Vec<u8> {
// Decide which method from RFC 7093 to use
let digest_method = match self.params.key_identifier_method {
KeyIdMethod::Sha256 => &digest::SHA256,
KeyIdMethod::Sha384 => &digest::SHA384,
KeyIdMethod::Sha512 => &digest::SHA512,
};
let digest = digest::digest(digest_method, self.key_pair.public_key_raw().as_ref());
let truncated_digest = &digest.as_ref()[0..20];
truncated_digest.to_vec()
}
/// Serializes the certificate to the binary DER format
pub fn serialize_der(&self) -> Result<Vec<u8>, RcgenError> {
self.serialize_der_with_signer(&self)
}
/// Serializes the certificate, signed with another certificate's key, in binary DER format
pub fn serialize_der_with_signer(&self, ca :&Certificate) -> Result<Vec<u8>, RcgenError> {
yasna::try_construct_der(|writer| {
writer.write_sequence(|writer| {
let tbs_cert_list_serialized = yasna::try_construct_der(|writer| {
self.write_cert(writer, ca)?;
Ok::<(), RcgenError>(())
})?;
// Write tbsCertList
writer.next().write_der(&tbs_cert_list_serialized);
// Write signatureAlgorithm
self.params.alg.write_alg_ident(writer.next());
// Write signature
ca.key_pair.sign(&tbs_cert_list_serialized, writer.next())?;
Ok(())
})
})