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use crate::cri_attributes::*;
use crate::error::{X509Error, X509Result};
use crate::extensions::*;
use crate::x509::{
parse_signature_value, AlgorithmIdentifier, SubjectPublicKeyInfo, X509Name, X509Version,
};
#[cfg(feature = "verify")]
use crate::verify::verify_signature;
use asn1_rs::{BitString, FromDer};
use der_parser::der::*;
use der_parser::oid::Oid;
use der_parser::*;
use nom::Offset;
use std::collections::HashMap;
/// Certification Signing Request (CSR)
#[derive(Debug, PartialEq)]
pub struct X509CertificationRequest<'a> {
pub certification_request_info: X509CertificationRequestInfo<'a>,
pub signature_algorithm: AlgorithmIdentifier<'a>,
pub signature_value: BitString<'a>,
}
impl<'a> X509CertificationRequest<'a> {
pub fn requested_extensions(&self) -> Option<impl Iterator<Item = &ParsedExtension>> {
self.certification_request_info
.iter_attributes()
.find_map(|attr| {
if let ParsedCriAttribute::ExtensionRequest(requested) = &attr.parsed_attribute {
Some(requested.extensions.iter().map(|ext| &ext.parsed_extension))
} else {
None
}
})
}
/// Verify the cryptographic signature of this certification request
///
/// Uses the public key contained in the CSR, which must be the one of the entity
/// requesting the certification for this verification to succeed.
#[cfg(feature = "verify")]
pub fn verify_signature(&self) -> Result<(), X509Error> {
let spki = &self.certification_request_info.subject_pki;
verify_signature(
spki,
&self.signature_algorithm,
&self.signature_value,
self.certification_request_info.raw,
)
}
}
/// <pre>
/// CertificationRequest ::= SEQUENCE {
/// certificationRequestInfo CertificationRequestInfo,
/// signatureAlgorithm AlgorithmIdentifier{{ SignatureAlgorithms }},
/// signature BIT STRING
/// }
/// </pre>
impl<'a> FromDer<'a, X509Error> for X509CertificationRequest<'a> {
fn from_der(i: &'a [u8]) -> X509Result<'a, Self> {
parse_der_sequence_defined_g(|i, _| {
let (i, certification_request_info) = X509CertificationRequestInfo::from_der(i)?;
let (i, signature_algorithm) = AlgorithmIdentifier::from_der(i)?;
let (i, signature_value) = parse_signature_value(i)?;
let cert = X509CertificationRequest {
certification_request_info,
signature_algorithm,
signature_value,
};
Ok((i, cert))
})(i)
}
}
/// Certification Request Info structure
///
/// Certification request information is defined by the following ASN.1 structure:
///
/// <pre>
/// CertificationRequestInfo ::= SEQUENCE {
/// version INTEGER { v1(0) } (v1,...),
/// subject Name,
/// subjectPKInfo SubjectPublicKeyInfo{{ PKInfoAlgorithms }},
/// attributes [0] Attributes{{ CRIAttributes }}
/// }
/// </pre>
///
/// version is the version number; subject is the distinguished name of the certificate
/// subject; subject_pki contains information about the public key being certified, and
/// attributes is a collection of attributes providing additional information about the
/// subject of the certificate.
#[derive(Debug, PartialEq)]
pub struct X509CertificationRequestInfo<'a> {
pub version: X509Version,
pub subject: X509Name<'a>,
pub subject_pki: SubjectPublicKeyInfo<'a>,
attributes: Vec<X509CriAttribute<'a>>,
pub raw: &'a [u8],
}
impl<'a> X509CertificationRequestInfo<'a> {
/// Get the CRL entry extensions.
#[inline]
pub fn attributes(&self) -> &[X509CriAttribute] {
&self.attributes
}
/// Returns an iterator over the CRL entry extensions
#[inline]
pub fn iter_attributes(&self) -> impl Iterator<Item = &X509CriAttribute> {
self.attributes.iter()
}
/// Searches for a CRL entry extension with the given `Oid`.
///
/// Note: if there are several extensions with the same `Oid`, the first one is returned.
pub fn find_attribute(&self, oid: &Oid) -> Option<&X509CriAttribute> {
self.attributes.iter().find(|&ext| ext.oid == *oid)
}
/// Builds and returns a map of CRL entry extensions.
///
/// If an extension is present twice, this will fail and return `DuplicateExtensions`.
pub fn attributes_map(&self) -> Result<HashMap<Oid, &X509CriAttribute>, X509Error> {
self.attributes
.iter()
.try_fold(HashMap::new(), |mut m, ext| {
if m.contains_key(&ext.oid) {
return Err(X509Error::DuplicateAttributes);
}
m.insert(ext.oid.clone(), ext);
Ok(m)
})
}
}
/// <pre>
/// CertificationRequestInfo ::= SEQUENCE {
/// version INTEGER { v1(0) } (v1,...),
/// subject Name,
/// subjectPKInfo SubjectPublicKeyInfo{{ PKInfoAlgorithms }},
/// attributes [0] Attributes{{ CRIAttributes }}
/// }
/// </pre>
impl<'a> FromDer<'a, X509Error> for X509CertificationRequestInfo<'a> {
fn from_der(i: &'a [u8]) -> X509Result<Self> {
let start_i = i;
parse_der_sequence_defined_g(move |i, _| {
let (i, version) = X509Version::from_der(i)?;
let (i, subject) = X509Name::from_der(i)?;
let (i, subject_pki) = SubjectPublicKeyInfo::from_der(i)?;
let (i, attributes) = parse_cri_attributes(i)?;
let len = start_i.offset(i);
let tbs = X509CertificationRequestInfo {
version,
subject,
subject_pki,
attributes,
raw: &start_i[..len],
};
Ok((i, tbs))
})(i)
}
}
|
