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use crate::io::Buf;
use crate::postgres::protocol::Decode;
use byteorder::NetworkEndian;
use std::str;
#[derive(Debug)]
pub enum Authentication {
/// Authentication was successful.
Ok,
/// Kerberos V5 authentication is required.
KerberosV5,
/// A clear-text password is required.
ClearTextPassword,
/// An MD5-encrypted password is required.
Md5Password { salt: [u8; 4] },
/// An SCM credentials message is required.
ScmCredential,
/// GSSAPI authentication is required.
Gss,
/// SSPI authentication is required.
Sspi,
/// This message contains GSSAPI or SSPI data.
GssContinue { data: Box<[u8]> },
/// SASL authentication is required.
///
/// The message body is a list of SASL authentication mechanisms,
/// in the server's order of preference.
Sasl { mechanisms: Box<[Box<str>]> },
/// This message contains a SASL challenge.
SaslContinue(SaslContinue),
/// SASL authentication has completed.
SaslFinal { data: Box<[u8]> },
}
#[derive(Debug)]
pub struct SaslContinue {
pub salt: Vec<u8>,
pub iter_count: u32,
pub nonce: Vec<u8>,
pub data: String,
}
impl Decode for Authentication {
fn decode(mut buf: &[u8]) -> crate::Result<Self> {
Ok(match buf.get_u32::<NetworkEndian>()? {
0 => Authentication::Ok,
2 => Authentication::KerberosV5,
3 => Authentication::ClearTextPassword,
5 => {
let mut salt = [0_u8; 4];
salt.copy_from_slice(&buf);
Authentication::Md5Password { salt }
}
6 => Authentication::ScmCredential,
7 => Authentication::Gss,
8 => {
let mut data = Vec::with_capacity(buf.len());
data.extend_from_slice(buf);
Authentication::GssContinue {
data: data.into_boxed_slice(),
}
}
9 => Authentication::Sspi,
10 => {
let mut mechanisms = Vec::new();
while buf[0] != 0 {
mechanisms.push(buf.get_str_nul()?.into());
}
Authentication::Sasl {
mechanisms: mechanisms.into_boxed_slice(),
}
}
11 => {
let mut salt: Vec<u8> = Vec::new();
let mut nonce: Vec<u8> = Vec::new();
let mut iter_count: u32 = 0;
let key_value: Vec<(char, &[u8])> = buf
.split(|byte| *byte == b',')
.map(|s| {
let (key, value) = s.split_at(1);
let value = value.split_at(1).1;
(key[0] as char, value)
})
.collect();
for (key, value) in key_value.iter() {
match key {
's' => salt = value.to_vec(),
'r' => nonce = value.to_vec(),
'i' => {
let s = str::from_utf8(&value).map_err(|_| {
protocol_err!(
"iteration count in sasl response was not a valid utf8 string"
)
})?;
iter_count = u32::from_str_radix(&s, 10).unwrap_or(0);
}
_ => {}
}
}
Authentication::SaslContinue(SaslContinue {
salt: base64::decode(&salt).map_err(|_| {
protocol_err!("salt value response from postgres was not base64 encoded")
})?,
nonce,
iter_count,
data: str::from_utf8(buf)
.map_err(|_| {
protocol_err!("SaslContinue response was not a valid utf8 string")
})?
.to_string(),
})
}
12 => {
let mut data = Vec::with_capacity(buf.len());
data.extend_from_slice(buf);
Authentication::SaslFinal {
data: data.into_boxed_slice(),
}
}
id => {
return Err(protocol_err!("unknown authentication response: {}", id).into());
}
})
}
}
#[cfg(test)]
mod tests {
use super::{Authentication, Decode};
use matches::assert_matches;
const AUTH_OK: &[u8] = b"\0\0\0\0";
const AUTH_MD5: &[u8] = b"\0\0\0\x05\x93\x189\x98";
#[test]
fn it_decodes_auth_ok() {
let m = Authentication::decode(AUTH_OK).unwrap();
assert_matches!(m, Authentication::Ok);
}
#[test]
fn it_decodes_auth_md5_password() {
let m = Authentication::decode(AUTH_MD5).unwrap();
assert_matches!(
m,
Authentication::Md5Password {
salt: [147, 24, 57, 152]
}
);
}
}