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/* Copyright (C) 2019-2020 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
//! Module for SSL/TLS X.509 certificates parser and decoder.
// written by Pierre Chifflier <chifflier@wzdftpd.net>
use crate::common::rust_string_to_c;
use nom7::Err;
use std;
use std::os::raw::c_char;
use x509_parser::prelude::*;
mod time;
mod log;
#[repr(u32)]
pub enum X509DecodeError {
_Success = 0,
/// Generic decoding error
InvalidCert,
/// Some length does not match, or certificate is incomplete
InvalidLength,
InvalidVersion,
InvalidSerial,
InvalidAlgorithmIdentifier,
InvalidX509Name,
InvalidDate,
InvalidExtensions,
/// DER structure is invalid
InvalidDER,
}
pub struct X509(X509Certificate<'static>);
/// Attempt to parse a X.509 from input, and return a pointer to the parsed object if successful.
///
/// # Safety
///
/// input must be a valid buffer of at least input_len bytes
#[no_mangle]
pub unsafe extern "C" fn rs_x509_decode(
input: *const u8,
input_len: u32,
err_code: *mut u32,
) -> *mut X509 {
let slice = std::slice::from_raw_parts(input, input_len as usize);
let res = X509Certificate::from_der(slice);
match res {
Ok((_rem, cert)) => Box::into_raw(Box::new(X509(cert))),
Err(e) => {
let error = x509_parse_error_to_errcode(&e);
*err_code = error as u32;
std::ptr::null_mut()
}
}
}
#[no_mangle]
pub unsafe extern "C" fn rs_x509_get_subject(ptr: *const X509) -> *mut c_char {
if ptr.is_null() {
return std::ptr::null_mut();
}
let x509 = cast_pointer! {ptr, X509};
let subject = x509.0.tbs_certificate.subject.to_string();
rust_string_to_c(subject)
}
#[no_mangle]
pub unsafe extern "C" fn rs_x509_get_issuer(ptr: *const X509) -> *mut c_char {
if ptr.is_null() {
return std::ptr::null_mut();
}
let x509 = cast_pointer! {ptr, X509};
let issuer = x509.0.tbs_certificate.issuer.to_string();
rust_string_to_c(issuer)
}
#[no_mangle]
pub unsafe extern "C" fn rs_x509_get_serial(ptr: *const X509) -> *mut c_char {
if ptr.is_null() {
return std::ptr::null_mut();
}
let x509 = cast_pointer! {ptr, X509};
let raw_serial = x509.0.tbs_certificate.raw_serial();
let v: Vec<_> = raw_serial.iter().map(|x| format!("{:02X}", x)).collect();
let serial = v.join(":");
rust_string_to_c(serial)
}
/// Extract validity from input X.509 object
///
/// # Safety
///
/// ptr must be a valid object obtained using `rs_x509_decode`
#[no_mangle]
pub unsafe extern "C" fn rs_x509_get_validity(
ptr: *const X509,
not_before: *mut i64,
not_after: *mut i64,
) -> i32 {
if ptr.is_null() {
return -1;
}
let x509 = &*ptr;
let n_b = x509.0.validity().not_before.timestamp();
let n_a = x509.0.validity().not_after.timestamp();
*not_before = n_b;
*not_after = n_a;
0
}
/// Free a X.509 object allocated by Rust
///
/// # Safety
///
/// ptr must be a valid object obtained using `rs_x509_decode`
#[no_mangle]
pub unsafe extern "C" fn rs_x509_free(ptr: *mut X509) {
if ptr.is_null() {
return;
}
drop(Box::from_raw(ptr));
}
fn x509_parse_error_to_errcode(e: &Err<X509Error>) -> X509DecodeError {
match e {
Err::Incomplete(_) => X509DecodeError::InvalidLength,
Err::Error(e) | Err::Failure(e) => match e {
X509Error::InvalidVersion => X509DecodeError::InvalidVersion,
X509Error::InvalidSerial => X509DecodeError::InvalidSerial,
X509Error::InvalidAlgorithmIdentifier => X509DecodeError::InvalidAlgorithmIdentifier,
X509Error::InvalidX509Name => X509DecodeError::InvalidX509Name,
X509Error::InvalidDate => X509DecodeError::InvalidDate,
X509Error::InvalidExtensions => X509DecodeError::InvalidExtensions,
X509Error::Der(_) => X509DecodeError::InvalidDER,
_ => X509DecodeError::InvalidCert,
},
}
}
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