use std::convert::{TryFrom, TryInto};
use std::hash::Hasher;
use base64::prelude::*;
use crc32c::Crc32cHasher as Crc32c;
use crc32fast::Hasher as Crc32;
use md5::{Digest, Md5};
use sha1::Sha1;
use sha2::Sha256;
use http::{HeaderMap, HeaderName, HeaderValue};
use garage_util::data::*;
use garage_util::error::OkOrMessage;
use garage_model::s3::object_table::*;
use crate::s3::error::*;
pub const X_AMZ_CHECKSUM_ALGORITHM: HeaderName =
HeaderName::from_static("x-amz-checksum-algorithm");
pub const X_AMZ_CHECKSUM_MODE: HeaderName = HeaderName::from_static("x-amz-checksum-mode");
pub const X_AMZ_CHECKSUM_CRC32: HeaderName = HeaderName::from_static("x-amz-checksum-crc32");
pub const X_AMZ_CHECKSUM_CRC32C: HeaderName = HeaderName::from_static("x-amz-checksum-crc32c");
pub const X_AMZ_CHECKSUM_SHA1: HeaderName = HeaderName::from_static("x-amz-checksum-sha1");
pub const X_AMZ_CHECKSUM_SHA256: HeaderName = HeaderName::from_static("x-amz-checksum-sha256");
pub type Crc32Checksum = [u8; 4];
pub type Crc32cChecksum = [u8; 4];
pub type Md5Checksum = [u8; 16];
pub type Sha1Checksum = [u8; 20];
pub type Sha256Checksum = [u8; 32];
#[derive(Debug, Default)]
pub(crate) struct ExpectedChecksums {
// base64-encoded md5 (content-md5 header)
pub md5: Option<String>,
// content_sha256 (as a Hash / FixedBytes32)
pub sha256: Option<Hash>,
// extra x-amz-checksum-* header
pub extra: Option<ChecksumValue>,
}
pub(crate) struct Checksummer {
pub crc32: Option<Crc32>,
pub crc32c: Option<Crc32c>,
pub md5: Option<Md5>,
pub sha1: Option<Sha1>,
pub sha256: Option<Sha256>,
}
#[derive(Default)]
pub(crate) struct Checksums {
pub crc32: Option<Crc32Checksum>,
pub crc32c: Option<Crc32cChecksum>,
pub md5: Option<Md5Checksum>,
pub sha1: Option<Sha1Checksum>,
pub sha256: Option<Sha256Checksum>,
}
impl Checksummer {
pub(crate) fn init(expected: &ExpectedChecksums, require_md5: bool) -> Self {
let mut ret = Self {
crc32: None,
crc32c: None,
md5: None,
sha1: None,
sha256: None,
};
if expected.md5.is_some() || require_md5 {
ret.md5 = Some(Md5::new());
}
if expected.sha256.is_some() || matches!(&expected.extra, Some(ChecksumValue::Sha256(_))) {
ret.sha256 = Some(Sha256::new());
}
if matches!(&expected.extra, Some(ChecksumValue::Crc32(_))) {
ret.crc32 = Some(Crc32::new());
}
if matches!(&expected.extra, Some(ChecksumValue::Crc32c(_))) {
ret.crc32c = Some(Crc32c::default());
}
if matches!(&expected.extra, Some(ChecksumValue::Sha1(_))) {
ret.sha1 = Some(Sha1::new());
}
ret
}
pub(crate) fn add(mut self, algo: Option<ChecksumAlgorithm>) -> Self {
match algo {
Some(ChecksumAlgorithm::Crc32) => {
self.crc32 = Some(Crc32::new());
}
Some(ChecksumAlgorithm::Crc32c) => {
self.crc32c = Some(Crc32c::default());
}
Some(ChecksumAlgorithm::Sha1) => {
self.sha1 = Some(Sha1::new());
}
Some(ChecksumAlgorithm::Sha256) => {
self.sha256 = Some(Sha256::new());
}
None => (),
}
self
}
pub(crate) fn update(&mut self, bytes: &[u8]) {
if let Some(crc32) = &mut self.crc32 {
crc32.update(bytes);
}
if let Some(crc32c) = &mut self.crc32c {
crc32c.write(bytes);
}
if let Some(md5) = &mut self.md5 {
md5.update(bytes);
}
if let Some(sha1) = &mut self.sha1 {
sha1.update(bytes);
}
if let Some(sha256) = &mut self.sha256 {
sha256.update(bytes);
}
}
pub(crate) fn finalize(self) -> Checksums {
Checksums {
crc32: self.crc32.map(|x| u32::to_be_bytes(x.finalize())),
crc32c: self
.crc32c
.map(|x| u32::to_be_bytes(u32::try_from(x.finish()).unwrap())),
md5: self.md5.map(|x| x.finalize()[..].try_into().unwrap()),
sha1: self.sha1.map(|x| x.finalize()[..].try_into().unwrap()),
sha256: self.sha256.map(|x| x.finalize()[..].try_into().unwrap()),
}
}
}
impl Checksums {
pub fn verify(&self, expected: &ExpectedChecksums) -> Result<(), Error> {
if let Some(expected_md5) = &expected.md5 {
match self.md5 {
Some(md5) if BASE64_STANDARD.encode(&md5) == expected_md5.trim_matches('"') => (),
_ => {
return Err(Error::InvalidDigest(
"MD5 checksum verification failed (from content-md5)".into(),
))
}
}
}
if let Some(expected_sha256) = &expected.sha256 {
match self.sha256 {
Some(sha256) if &sha256[..] == expected_sha256.as_slice() => (),
_ => {
return Err(Error::InvalidDigest(
"SHA256 checksum verification failed (from x-amz-content-sha256)".into(),
))
}
}
}
if let Some(extra) = expected.extra {
let algo = extra.algorithm();
if self.extract(Some(algo)) != Some(extra) {
return Err(Error::InvalidDigest(format!(
"Failed to validate checksum for algorithm {:?}",
algo
)));
}
}
Ok(())
}
pub fn extract(&self, algo: Option<ChecksumAlgorithm>) -> Option<ChecksumValue> {
match algo {
None => None,
Some(ChecksumAlgorithm::Crc32) => Some(ChecksumValue::Crc32(self.crc32.unwrap())),
Some(ChecksumAlgorithm::Crc32c) => Some(ChecksumValue::Crc32c(self.crc32c.unwrap())),
Some(ChecksumAlgorithm::Sha1) => Some(ChecksumValue::Sha1(self.sha1.unwrap())),
Some(ChecksumAlgorithm::Sha256) => Some(ChecksumValue::Sha256(self.sha256.unwrap())),
}
}
}
// ----
#[derive(Default)]
pub(crate) struct MultipartChecksummer {
pub md5: Md5,
pub extra: Option<MultipartExtraChecksummer>,
}
pub(crate) enum MultipartExtraChecksummer {
Crc32(Crc32),
Crc32c(Crc32c),
Sha1(Sha1),
Sha256(Sha256),
}
impl MultipartChecksummer {
pub(crate) fn init(algo: Option<ChecksumAlgorithm>) -> Self {
Self {
md5: Md5::new(),
extra: match algo {
None => None,
Some(ChecksumAlgorithm::Crc32) => {
Some(MultipartExtraChecksummer::Crc32(Crc32::new()))
}
Some(ChecksumAlgorithm::Crc32c) => {
Some(MultipartExtraChecksummer::Crc32c(Crc32c::default()))
}
Some(ChecksumAlgorithm::Sha1) => Some(MultipartExtraChecksummer::Sha1(Sha1::new())),
Some(ChecksumAlgorithm::Sha256) => {
Some(MultipartExtraChecksummer::Sha256(Sha256::new()))
}
},
}
}
pub(crate) fn update(
&mut self,
etag: &str,
checksum: Option<ChecksumValue>,
) -> Result<(), Error> {
self.md5
.update(&hex::decode(&etag).ok_or_message("invalid etag hex")?);
match (&mut self.extra, checksum) {
(None, _) => (),
(
Some(MultipartExtraChecksummer::Crc32(ref mut crc32)),
Some(ChecksumValue::Crc32(x)),
) => {
crc32.update(&x);
}
(
Some(MultipartExtraChecksummer::Crc32c(ref mut crc32c)),
Some(ChecksumValue::Crc32c(x)),
) => {
crc32c.write(&x);
}
(Some(MultipartExtraChecksummer::Sha1(ref mut sha1)), Some(ChecksumValue::Sha1(x))) => {
sha1.update(&x);
}
(
Some(MultipartExtraChecksummer::Sha256(ref mut sha256)),
Some(ChecksumValue::Sha256(x)),
) => {
sha256.update(&x);
}
(Some(_), b) => {
return Err(Error::internal_error(format!(
"part checksum was not computed correctly, got: {:?}",
b
)))
}
}
Ok(())
}
pub(crate) fn finalize(self) -> (Md5Checksum, Option<ChecksumValue>) {
let md5 = self.md5.finalize()[..].try_into().unwrap();
let extra = match self.extra {
None => None,
Some(MultipartExtraChecksummer::Crc32(crc32)) => {
Some(ChecksumValue::Crc32(u32::to_be_bytes(crc32.finalize())))
}
Some(MultipartExtraChecksummer::Crc32c(crc32c)) => Some(ChecksumValue::Crc32c(
u32::to_be_bytes(u32::try_from(crc32c.finish()).unwrap()),
)),
Some(MultipartExtraChecksummer::Sha1(sha1)) => {
Some(ChecksumValue::Sha1(sha1.finalize()[..].try_into().unwrap()))
}
Some(MultipartExtraChecksummer::Sha256(sha256)) => Some(ChecksumValue::Sha256(
sha256.finalize()[..].try_into().unwrap(),
)),
};
(md5, extra)
}
}
// ----
/// Extract the value of the x-amz-checksum-algorithm header
pub(crate) fn request_checksum_algorithm(
headers: &HeaderMap<HeaderValue>,
) -> Result<Option<ChecksumAlgorithm>, Error> {
match headers.get(X_AMZ_CHECKSUM_ALGORITHM) {
None => Ok(None),
Some(x) if x == "CRC32" => Ok(Some(ChecksumAlgorithm::Crc32)),
Some(x) if x == "CRC32C" => Ok(Some(ChecksumAlgorithm::Crc32c)),
Some(x) if x == "SHA1" => Ok(Some(ChecksumAlgorithm::Sha1)),
Some(x) if x == "SHA256" => Ok(Some(ChecksumAlgorithm::Sha256)),
_ => Err(Error::bad_request("invalid checksum algorithm")),
}
}
/// Extract the value of any of the x-amz-checksum-* headers
pub(crate) fn request_checksum_value(
headers: &HeaderMap<HeaderValue>,
) -> Result<Option<ChecksumValue>, Error> {
let mut ret = vec![];
if let Some(crc32_str) = headers.get(X_AMZ_CHECKSUM_CRC32) {
let crc32 = BASE64_STANDARD
.decode(&crc32_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32 header")?;
ret.push(ChecksumValue::Crc32(crc32))
}
if let Some(crc32c_str) = headers.get(X_AMZ_CHECKSUM_CRC32C) {
let crc32c = BASE64_STANDARD
.decode(&crc32c_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32c header")?;
ret.push(ChecksumValue::Crc32c(crc32c))
}
if let Some(sha1_str) = headers.get(X_AMZ_CHECKSUM_SHA1) {
let sha1 = BASE64_STANDARD
.decode(&sha1_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha1 header")?;
ret.push(ChecksumValue::Sha1(sha1))
}
if let Some(sha256_str) = headers.get(X_AMZ_CHECKSUM_SHA256) {
let sha256 = BASE64_STANDARD
.decode(&sha256_str)
.ok()
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha256 header")?;
ret.push(ChecksumValue::Sha256(sha256))
}
if ret.len() > 1 {
return Err(Error::bad_request(
"multiple x-amz-checksum-* headers given",
));
}
Ok(ret.pop())
}
/// Checks for the presense of x-amz-checksum-algorithm
/// if so extract the corrseponding x-amz-checksum-* value
pub(crate) fn request_checksum_algorithm_value(
headers: &HeaderMap<HeaderValue>,
) -> Result<Option<ChecksumValue>, Error> {
match headers.get(X_AMZ_CHECKSUM_ALGORITHM) {
Some(x) if x == "CRC32" => {
let crc32 = headers
.get(X_AMZ_CHECKSUM_CRC32)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32 header")?;
Ok(Some(ChecksumValue::Crc32(crc32)))
}
Some(x) if x == "CRC32C" => {
let crc32c = headers
.get(X_AMZ_CHECKSUM_CRC32C)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-crc32c header")?;
Ok(Some(ChecksumValue::Crc32c(crc32c)))
}
Some(x) if x == "SHA1" => {
let sha1 = headers
.get(X_AMZ_CHECKSUM_SHA1)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha1 header")?;
Ok(Some(ChecksumValue::Sha1(sha1)))
}
Some(x) if x == "SHA256" => {
let sha256 = headers
.get(X_AMZ_CHECKSUM_SHA256)
.and_then(|x| BASE64_STANDARD.decode(&x).ok())
.and_then(|x| x.try_into().ok())
.ok_or_bad_request("invalid x-amz-checksum-sha256 header")?;
Ok(Some(ChecksumValue::Sha256(sha256)))
}
Some(_) => Err(Error::bad_request("invalid x-amz-checksum-algorithm")),
None => Ok(None),
}
}
pub(crate) fn add_checksum_response_headers(
checksum: &Option<ChecksumValue>,
mut resp: http::response::Builder,
) -> http::response::Builder {
match checksum {
Some(ChecksumValue::Crc32(crc32)) => {
resp = resp.header(X_AMZ_CHECKSUM_CRC32, BASE64_STANDARD.encode(&crc32));
}
Some(ChecksumValue::Crc32c(crc32c)) => {
resp = resp.header(X_AMZ_CHECKSUM_CRC32C, BASE64_STANDARD.encode(&crc32c));
}
Some(ChecksumValue::Sha1(sha1)) => {
resp = resp.header(X_AMZ_CHECKSUM_SHA1, BASE64_STANDARD.encode(&sha1));
}
Some(ChecksumValue::Sha256(sha256)) => {
resp = resp.header(X_AMZ_CHECKSUM_SHA256, BASE64_STANDARD.encode(&sha256));
}
None => (),
}
resp
}
