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use crate::error::{X509Error, X509Result};
use asn1_rs::FromDer;
use der_parser::der::*;
use der_parser::error::BerError;
use der_parser::{oid, oid::Oid};
use nom::{Err, IResult};
use std::fmt;
#[derive(Clone, Copy, Debug, PartialEq)]
pub struct KeyUsage {
pub flags: u16,
}
impl KeyUsage {
pub fn digital_signature(&self) -> bool {
self.flags & 1 == 1
}
pub fn non_repudiation(&self) -> bool {
(self.flags >> 1) & 1u16 == 1
}
pub fn key_encipherment(&self) -> bool {
(self.flags >> 2) & 1u16 == 1
}
pub fn data_encipherment(&self) -> bool {
(self.flags >> 3) & 1u16 == 1
}
pub fn key_agreement(&self) -> bool {
(self.flags >> 4) & 1u16 == 1
}
pub fn key_cert_sign(&self) -> bool {
(self.flags >> 5) & 1u16 == 1
}
pub fn crl_sign(&self) -> bool {
(self.flags >> 6) & 1u16 == 1
}
pub fn encipher_only(&self) -> bool {
(self.flags >> 7) & 1u16 == 1
}
pub fn decipher_only(&self) -> bool {
(self.flags >> 8) & 1u16 == 1
}
}
const KEY_USAGE_FLAGS: &[&str] = &[
"Digital Signature",
"Non Repudiation",
"Key Encipherment",
"Data Encipherment",
"Key Agreement",
"Key Cert Sign",
"CRL Sign",
"Encipher Only",
"Decipher Only",
];
impl fmt::Display for KeyUsage {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
let mut s = KEY_USAGE_FLAGS
.iter()
.enumerate()
.fold(String::new(), |acc, (idx, s)| {
if self.flags >> idx & 1 != 0 {
acc + s + ", "
} else {
acc
}
});
s.pop();
s.pop();
f.write_str(&s)
}
}
impl<'a> FromDer<'a, X509Error> for KeyUsage {
fn from_der(i: &'a [u8]) -> X509Result<'a, Self> {
parse_keyusage(i).map_err(Err::convert)
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct ExtendedKeyUsage<'a> {
pub any: bool,
pub server_auth: bool,
pub client_auth: bool,
pub code_signing: bool,
pub email_protection: bool,
pub time_stamping: bool,
pub ocsp_signing: bool,
pub other: Vec<Oid<'a>>,
}
impl<'a> FromDer<'a, X509Error> for ExtendedKeyUsage<'a> {
fn from_der(i: &'a [u8]) -> X509Result<'a, Self> {
parse_extendedkeyusage(i).map_err(Err::convert)
}
}
pub(crate) fn parse_keyusage(i: &[u8]) -> IResult<&[u8], KeyUsage, BerError> {
let (rest, obj) = parse_der_bitstring(i)?;
let bitstring = obj
.content
.as_bitstring()
.or(Err(Err::Error(BerError::BerTypeError)))?;
let flags = bitstring
.data
.iter()
.rev()
.fold(0, |acc, x| acc << 8 | (x.reverse_bits() as u16));
Ok((rest, KeyUsage { flags }))
}
pub(crate) fn parse_extendedkeyusage(i: &[u8]) -> IResult<&[u8], ExtendedKeyUsage, BerError> {
let (ret, seq) = <Vec<Oid>>::from_der(i)?;
let mut seen = std::collections::HashSet::new();
let mut eku = ExtendedKeyUsage {
any: false,
server_auth: false,
client_auth: false,
code_signing: false,
email_protection: false,
time_stamping: false,
ocsp_signing: false,
other: Vec::new(),
};
for oid in &seq {
if !seen.insert(oid.clone()) {
continue;
}
let asn1 = oid.as_bytes();
if asn1 == oid!(raw 2.5.29.37.0) {
eku.any = true;
} else if asn1 == oid!(raw 1.3.6.1.5.5.7.3.1) {
eku.server_auth = true;
} else if asn1 == oid!(raw 1.3.6.1.5.5.7.3.2) {
eku.client_auth = true;
} else if asn1 == oid!(raw 1.3.6.1.5.5.7.3.3) {
eku.code_signing = true;
} else if asn1 == oid!(raw 1.3.6.1.5.5.7.3.4) {
eku.email_protection = true;
} else if asn1 == oid!(raw 1.3.6.1.5.5.7.3.8) {
eku.time_stamping = true;
} else if asn1 == oid!(raw 1.3.6.1.5.5.7.3.9) {
eku.ocsp_signing = true;
} else {
eku.other.push(oid.clone());
}
}
Ok((ret, eku))
}
