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|
use std::borrow::Cow;
use aes_gcm::{
aead::{Aead, AeadCore, KeyInit, OsRng},
Aes256Gcm, Key, Nonce,
};
use http::header::{HeaderName, HeaderValue};
use hyper::{body::Body, Request};
use garage_model::garage::Garage;
use garage_model::s3::object_table::{ObjectVersionEncryption, ObjectVersionHeaders};
use crate::s3::error::Error;
const X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_ALGORITHM: HeaderName =
HeaderName::from_static("x-amz-server-side-encryption-customer-algorithm");
const X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY: HeaderName =
HeaderName::from_static("x-amz-server-side-encryption-customer-key");
const X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5: HeaderName =
HeaderName::from_static("x-amz-server-side-encryption-customer-key-MD5");
const X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_ALGORITHM: HeaderName =
HeaderName::from_static("x-amz-copy-source-server-side-encryption-customer-algorithm");
const X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY: HeaderName =
HeaderName::from_static("x-amz-copy-source-server-side-encryption-customer-key");
const X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5: HeaderName =
HeaderName::from_static("x-amz-copy-source-server-side-encryption-customer-key-MD5");
const CUSTOMER_ALGORITHM_AES256: HeaderValue = HeaderValue::from_static("AES256");
pub enum EncryptionParams {
Plaintext,
SseC {
client_key: Key<Aes256Gcm>,
compression_level: Option<i32>,
},
}
impl EncryptionParams {
pub fn new_from_req(
garage: &Garage,
req: &Request<impl Body>,
) -> Result<EncryptionParams, Error> {
let key = parse_request_headers(
req,
&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_ALGORITHM,
&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY,
&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5,
)?;
match key {
Some(client_key) => Ok(EncryptionParams::SseC {
client_key: parse_and_check_key(req)?,
compression_level: garage.config.compression_level,
}),
None => Ok(EncryptionParams::Plaintext),
}
}
pub fn check_decrypt_for_get<'a>(
garage: &Garage,
req: &Request<impl Body>,
obj_enc: &'a ObjectVersionEncryption,
) -> Result<(Self, Cow<'a, ObjectVersionHeaders>), Error> {
let key = parse_request_headers(
req,
&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_ALGORITHM,
&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY,
&X_AMZ_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5,
)?;
Self::check_decrypt(garage, key, obj_enc)
}
pub fn check_decrypt_for_copy_source<'a>(
garage: &Garage,
req: &Request<impl Body>,
obj_enc: &'a ObjectVersionEncryption,
) -> Result<(Self, Cow<'a, ObjectVersionHeaders>), Error> {
let key = parse_request_headers(
req,
&X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_ALGORITHM,
&X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY,
&X_AMZ_COPY_SOURCE_SERVER_SIDE_ENCRYPTION_CUSTOMER_KEY_MD5,
)?;
Self::check_decrypt(garage, key, obj_enc)
}
fn check_decrypt<'a>(
garage: &Garage,
key: Option<Key<Aes256Gcm>>,
obj_enc: &'a ObjectVersionEncryption,
) -> Result<(Self, Cow<'a, ObjectVersionHeaders>), Error> {
match (key, obj_enc) {
(
Some(client_key),
ObjectVersionEncryption::SseC {
headers,
compressed,
},
) => {
let cipher = Aes256Gcm::new(&client_key);
let nonce: Nonce<Aes256Gcm::NonceSize> = headers
.get(..12)
.ok_or_internal_error("invalid encrypted data")?
.try_into()
.unwrap();
let plaintext = cipher.decrypt(&nonce, &headers[12..]).ok_or_bad_request(
"Invalid encryption key, could not decrypt object metadata.",
)?;
let headers = ObjectVersionHeaders::decode(&plaintext)?;
let enc = Self::SseC {
client_key,
compression_level: if compressed {
Some(garage.config.compression_level.unwrap_or(1))
} else {
None
},
};
Ok((enc, headers.into()))
}
(None, ObjectVersionEncryption::Plaintext { headers }) => {
Ok((Self::Plaintext, headers.into()))
}
(_, ObjectVersionEncryption::SseC { .. }) => {
Err(Error::bad_request("Object is encrypted"))
}
(Some(_), _) => {
// TODO: should this be an OK scenario?
Err(Error::bad_request("Trying to decrypt a plaintext object"))
}
}
}
pub fn encrypt_headers(
&self,
h: ObjectVersionHeaders,
) -> Result<ObjectVersionEncryption, Error> {
match self {
Self::SseC {
client_key,
compression_level,
} => {
let cipher = Aes256Gcm::new(&client_key);
let nonce = Aes256Gcm::generate_nonce(&mut OsRng);
let plaintext = h.encode()?;
let ciphertext = cipher
.encrypt(&nonce, &plaintext)
.ok_or_internal_error("Encryption failed")?;
let headers_enc = [nonce.to_vec(), ciphertext].concat();
Ok(ObjectVersionEncryption::SseC {
headers: headers_enc,
compressed: compression_level.is_some(),
})
}
Self::Plaintext => Ok(ObjectVersionEncryption::Plaintext { headers: h }),
}
}
}
fn parse_request_headers(
req: &Request<impl Body>,
alg_header: &HeaderName,
key_header: &HeaderName,
md5_header: &HeaderName,
) -> Result<Option<Key<Aes256Gcm>>, Error> {
match req.headers().get(alg_header) {
Some(CUSTOMER_ALGORITHM_AES256) => {
use md5::{Digest, Md5};
let key_b64 = req
.headers()
.get(key_header)
.ok_or_bad_request(format!("Missing {} header", key_header))?;
let key_bytes: [u8; 32] = base64::decode(&key_b64)
.ok_or_bad_request(format!("Invalid {} header", key_header))?
.try_into()
.ok_or_bad_request(format!("Invalid {} header", key_header))?;
let md5_b64 = req
.headers()
.get(md5_header)
.ok_or_bad_request(format!("Missing {} header", md5_header))?;
let md5_bytes = base64::decode(&md5_b64)
.ok_or_bad_request(format!("Invalid {} header", md5_header))?;
let mut hasher = Md5::new();
hasher.update(&key_bytes[..]);
if hasher.finalize() != md5_bytes {
return Err(Error::bad_request(
"Encryption key MD5 checksum does not match",
));
}
Ok(Some(key_bytes.into()))
}
Some(alg) => Err(Error::InvalidEncryptionAlgorithm(alg.to_string())),
None => Ok(None),
}
}
|
