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/target
**/*.rs.bk
Cargo.lock

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[package]
name = "http-signature-normalization"
description = "An HTTP Signatures library that leaves the signing to you"
version = "0.1.0"
authors = ["asonix <asonix@asonix.dog>"]
license-file = "./LICENSE"
readme = "./README.md"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
base64 = "0.10"
chrono = "0.4"
http = "0.1.18"

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Http Signature Normalization
Copyright Riley Trautman 2019
COOPERATIVE SOFTWARE LICENSE
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README.md Normal file
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HTTP Signature Normaliztion
_An HTTP Signatures library that leaves the signing to you_

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use chrono::{DateTime, Utc};
use http::header::{HeaderMap, HeaderName, HeaderValue, InvalidHeaderValue, AUTHORIZATION};
use crate::{
ALGORITHM_FIELD, ALGORITHM_VALUE, CREATED_FIELD, EXPIRES_FIELD, HEADERS_FIELD, KEY_ID_FIELD,
SIGNATURE_FIELD,
};
const SIGNATURE_HEADER: &'static str = "Signature";
pub struct Signed {
signature: String,
sig_headers: Vec<String>,
created: DateTime<Utc>,
expires: DateTime<Utc>,
key_id: String,
}
pub struct Unsigned {
pub(crate) signing_string: String,
pub(crate) sig_headers: Vec<String>,
pub(crate) created: DateTime<Utc>,
pub(crate) expires: DateTime<Utc>,
}
impl Signed {
pub fn signature_header(self, hm: &mut HeaderMap) -> Result<(), InvalidHeaderValue> {
hm.insert(
AUTHORIZATION,
HeaderValue::from_str(&format!("Signature {}", self.into_header()))?,
);
Ok(())
}
pub fn authorization_header(self, hm: &mut HeaderMap) -> Result<(), InvalidHeaderValue> {
hm.insert(
HeaderName::from_static(SIGNATURE_HEADER),
HeaderValue::from_str(&self.into_header())?,
);
Ok(())
}
fn into_header(self) -> String {
let header_parts = [
(KEY_ID_FIELD, self.key_id),
(ALGORITHM_FIELD, ALGORITHM_VALUE.to_owned()),
(CREATED_FIELD, self.created.timestamp().to_string()),
(EXPIRES_FIELD, self.expires.timestamp().to_string()),
(HEADERS_FIELD, self.sig_headers.join(" ")),
(SIGNATURE_FIELD, self.signature),
];
header_parts
.iter()
.map(|(k, v)| format!("{}=\"{}\"", k, v))
.collect::<Vec<_>>()
.join(",")
}
}
impl Unsigned {
pub fn sign<F, E>(self, key_id: String, f: F) -> Result<Signed, E>
where
F: FnOnce(&str) -> Result<Vec<u8>, E>,
{
(f)(&self.signing_string).map(|v| Signed {
signature: base64::encode(&v),
sig_headers: self.sig_headers,
created: self.created,
expires: self.expires,
key_id,
})
}
}

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use chrono::{DateTime, Duration, Utc};
use http::{
header::{HeaderMap, ToStrError},
method::Method,
uri::PathAndQuery,
};
use std::collections::BTreeMap;
pub mod create;
pub mod verify;
use self::{
create::Unsigned,
verify::{Unvalidated, ValidateError},
};
const REQUEST_TARGET: &'static str = "(request-target)";
const CREATED: &'static str = "(crated)";
const EXPIRES: &'static str = "(expires)";
const KEY_ID_FIELD: &'static str = "keyId";
const ALGORITHM_FIELD: &'static str = "algorithm";
const ALGORITHM_VALUE: &'static str = "hs2019";
const CREATED_FIELD: &'static str = "created";
const EXPIRES_FIELD: &'static str = "expires";
const HEADERS_FIELD: &'static str = "headers";
const SIGNATURE_FIELD: &'static str = "signature";
#[derive(Clone)]
pub struct Config {
pub expires: Duration,
}
impl Config {
pub fn normalize(
&self,
method: Method,
path_and_query: &PathAndQuery,
headers: &HeaderMap,
) -> Result<Unsigned, ToStrError> {
let (sig_headers, mut btm) = build_headers_list(headers)?;
let created = Utc::now();
let expires = created + self.expires;
let signing_string = build_signing_string(
method,
path_and_query,
Some(created),
Some(expires),
&sig_headers,
&mut btm,
);
Ok(Unsigned {
signing_string,
sig_headers,
created,
expires,
})
}
pub fn validate<F, T>(&self, unvalidated: Unvalidated, f: F) -> Result<T, ValidateError>
where
F: FnOnce(&[u8], &str) -> T,
{
if let Some(expires) = unvalidated.expires {
if expires < unvalidated.parsed_at {
return Err(ValidateError::Expired);
}
}
if let Some(created) = unvalidated.created {
if created + self.expires < unvalidated.parsed_at {
return Err(ValidateError::Expired);
}
}
let v = base64::decode(&unvalidated.signature).map_err(|_| ValidateError::Decode)?;
Ok((f)(&v, &unvalidated.signing_string))
}
}
fn build_headers_list(
headers: &HeaderMap,
) -> Result<(Vec<String>, BTreeMap<String, String>), ToStrError> {
let btm: BTreeMap<String, String> = headers
.iter()
.map(|(k, v)| {
v.to_str()
.map(|v| (k.as_str().to_lowercase().to_owned(), v.to_owned()))
})
.collect::<Result<BTreeMap<String, String>, _>>()?;
let http_header_keys: Vec<String> = btm.keys().cloned().collect();
let mut sig_headers = vec![
REQUEST_TARGET.to_owned(),
CREATED.to_owned(),
EXPIRES.to_owned(),
];
sig_headers.extend(http_header_keys);
Ok((sig_headers, btm))
}
fn build_signing_string(
method: Method,
path_and_query: &PathAndQuery,
created: Option<DateTime<Utc>>,
expires: Option<DateTime<Utc>>,
sig_headers: &[String],
btm: &mut BTreeMap<String, String>,
) -> String {
let request_target = format!("{} {}", method.to_string().to_lowercase(), path_and_query);
btm.insert(REQUEST_TARGET.to_owned(), request_target.clone());
if let Some(created) = created {
btm.insert(CREATED.to_owned(), created.timestamp().to_string());
}
if let Some(expires) = expires {
btm.insert(EXPIRES.to_owned(), expires.timestamp().to_string());
}
let signing_string = sig_headers
.iter()
.filter_map(|h| btm.remove(h).map(|v| format!("{}: {}", h, v)))
.collect::<Vec<_>>()
.join("\n");
signing_string
}
impl Default for Config {
fn default() -> Self {
Config {
expires: Duration::seconds(10),
}
}
}
#[cfg(test)]
mod tests {
#[test]
fn it_works() {
assert_eq!(2 + 2, 4);
}
}

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use chrono::{DateTime, TimeZone, Utc};
use http::{
header::{HeaderMap, ToStrError},
method::Method,
uri::PathAndQuery,
};
use std::{collections::HashMap, error::Error, fmt, str::FromStr};
use crate::{
build_headers_list, build_signing_string, ALGORITHM_FIELD, CREATED, CREATED_FIELD,
EXPIRES_FIELD, HEADERS_FIELD, KEY_ID_FIELD, SIGNATURE_FIELD,
};
pub struct Unvalidated {
pub(crate) key_id: String,
pub(crate) signature: String,
pub(crate) algorithm: Option<Algorithm>,
pub(crate) created: Option<DateTime<Utc>>,
pub(crate) expires: Option<DateTime<Utc>>,
pub(crate) parsed_at: DateTime<Utc>,
pub(crate) signing_string: String,
}
pub struct ParsedHeader {
signature: String,
key_id: String,
headers: Vec<String>,
algorithm: Option<Algorithm>,
created: Option<DateTime<Utc>>,
expires: Option<DateTime<Utc>>,
parsed_at: DateTime<Utc>,
}
#[derive(Clone, Copy, Debug)]
pub enum DeprecatedAlgorithm {
HmacSha1,
HmacSha256,
HmacSha384,
HmacSha512,
RsaSha1,
RsaSha256,
RsaSha384,
RsaSha512,
EcdsaSha1,
EcdsaSha256,
EcdsaSha384,
EcdsaSha512,
}
#[derive(Clone, Debug)]
pub enum Algorithm {
Hs2019,
Deprecated(DeprecatedAlgorithm),
Unknown(String),
}
#[derive(Clone, Debug)]
pub enum ValidateError {
Expired,
Decode,
}
#[derive(Clone, Debug)]
pub struct ParseSignatureError(&'static str);
impl Unvalidated {
pub fn key_id(&self) -> &str {
&self.key_id
}
pub fn algorithm(&self) -> Option<&Algorithm> {
self.algorithm.as_ref()
}
}
impl ParsedHeader {
pub fn to_unvalidated(
self,
method: Method,
path_and_query: &PathAndQuery,
headers: &HeaderMap,
) -> Result<Unvalidated, ToStrError> {
let (_, mut btm) = build_headers_list(headers)?;
let signing_string = build_signing_string(
method,
path_and_query,
self.created,
self.expires,
&self.headers,
&mut btm,
);
Ok(Unvalidated {
key_id: self.key_id,
signature: self.signature,
parsed_at: self.parsed_at,
algorithm: self.algorithm,
created: self.created,
expires: self.expires,
signing_string,
})
}
}
impl FromStr for ParsedHeader {
type Err = ParseSignatureError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let s = s.trim_start_matches("Signature").trim();
let mut hm: HashMap<String, String> = s
.split(',')
.filter_map(|part| {
let mut i = part.splitn(2, "=");
if let Some(key) = i.next() {
if let Some(value) = i.next() {
return Some((key.to_owned(), value.to_owned()));
}
}
None
})
.collect();
Ok(ParsedHeader {
signature: hm
.remove(SIGNATURE_FIELD)
.ok_or(ParseSignatureError(SIGNATURE_FIELD))?,
key_id: hm
.remove(KEY_ID_FIELD)
.ok_or(ParseSignatureError(KEY_ID_FIELD))?,
headers: hm
.remove(HEADERS_FIELD)
.map(|h| h.split_whitespace().map(|s| s.to_owned()).collect())
.unwrap_or_else(|| vec![CREATED.to_owned()]),
algorithm: hm.remove(ALGORITHM_FIELD).map(Algorithm::from),
created: parse_time(&mut hm, CREATED_FIELD)?,
expires: parse_time(&mut hm, EXPIRES_FIELD)?,
parsed_at: Utc::now(),
})
}
}
fn parse_time(
hm: &mut HashMap<String, String>,
key: &'static str,
) -> Result<Option<DateTime<Utc>>, ParseSignatureError> {
let r = hm.remove(key).map(|s| {
Utc.datetime_from_str(&s, "%s")
.map_err(|_| ParseSignatureError(key))
});
match r {
Some(Ok(t)) => Ok(Some(t)),
Some(Err(e)) => Err(e),
None => Ok(None),
}
}
impl From<DeprecatedAlgorithm> for Algorithm {
fn from(d: DeprecatedAlgorithm) -> Algorithm {
Algorithm::Deprecated(d)
}
}
impl From<String> for Algorithm {
fn from(s: String) -> Self {
Algorithm::from(s.as_str())
}
}
impl From<&str> for Algorithm {
fn from(s: &str) -> Self {
match s {
"hmac-sha1" => DeprecatedAlgorithm::HmacSha1.into(),
"hmac-sha256" => DeprecatedAlgorithm::HmacSha256.into(),
"hmac-sha384" => DeprecatedAlgorithm::HmacSha384.into(),
"hmac-sha512" => DeprecatedAlgorithm::HmacSha512.into(),
"rsa-sha1" => DeprecatedAlgorithm::RsaSha1.into(),
"rsa-sha256" => DeprecatedAlgorithm::RsaSha256.into(),
"rsa-sha384" => DeprecatedAlgorithm::RsaSha384.into(),
"rsa-sha512" => DeprecatedAlgorithm::RsaSha512.into(),
"ecdsa-sha1" => DeprecatedAlgorithm::EcdsaSha1.into(),
"ecdsa-sha256" => DeprecatedAlgorithm::EcdsaSha256.into(),
"ecdsa-sha384" => DeprecatedAlgorithm::EcdsaSha384.into(),
"ecdsa-sha512" => DeprecatedAlgorithm::EcdsaSha512.into(),
"hs2019" => Algorithm::Hs2019,
other => Algorithm::Unknown(other.into()),
}
}
}
impl fmt::Display for ValidateError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
ValidateError::Expired => write!(f, "Http Signature is expired"),
ValidateError::Decode => write!(f, "Http Signature could not be decoded"),
}
}
}
impl fmt::Display for ParseSignatureError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "Error when parsing {} from Http Signature", self.0)
}
}
impl Error for ValidateError {
fn description(&self) -> &'static str {
match *self {
ValidateError::Expired => "Http Signature is expired",
ValidateError::Decode => "Http Signature could not be decoded",
}
}
}
impl Error for ParseSignatureError {
fn description(&self) -> &'static str {
"There was an error parsing the Http Signature"
}
}