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Merge pull request 'Split presigned signature verification + fix conditions' (#735) from fix-presigned into main

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Reviewed-on: https://git.deuxfleurs.fr/Deuxfleurs/garage/pulls/735
This commit is contained in:
Alex 2024-02-28 11:38:00 +00:00
commit 10031a3a91
8 changed files with 501 additions and 286 deletions
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15
src/api/k2v/api_server.rs
View file

@ -15,8 +15,7 @@ use garage_model::garage::Garage;
use crate::generic_server::*;
use crate::k2v::error::*;
use crate::signature::payload::check_payload_signature;
use crate::signature::streaming::*;
use crate::signature::verify_request;
use crate::helpers::*;
use crate::k2v::batch::*;
@ -86,17 +85,7 @@ impl ApiHandler for K2VApiServer {
return Ok(options_res.map(|_empty_body: EmptyBody| empty_body()));
}
let (api_key, mut content_sha256) = check_payload_signature(&garage, "k2v", &req).await?;
let api_key = api_key
.ok_or_else(|| Error::forbidden("Garage does not support anonymous access yet"))?;
let req = parse_streaming_body(
&api_key,
req,
&mut content_sha256,
&garage.config.s3_api.s3_region,
"k2v",
)?;
let (req, api_key, _content_sha256) = verify_request(&garage, req, "k2v").await?;
let bucket_id = garage
.bucket_helper()

15
src/api/s3/api_server.rs
View file

@ -17,8 +17,7 @@ use garage_model::key_table::Key;
use crate::generic_server::*;
use crate::s3::error::*;
use crate::signature::payload::check_payload_signature;
use crate::signature::streaming::*;
use crate::signature::verify_request;
use crate::helpers::*;
use crate::s3::bucket::*;
@ -125,17 +124,7 @@ impl ApiHandler for S3ApiServer {
return Ok(options_res.map(|_empty_body: EmptyBody| empty_body()));
}
let (api_key, mut content_sha256) = check_payload_signature(&garage, "s3", &req).await?;
let api_key = api_key
.ok_or_else(|| Error::forbidden("Garage does not support anonymous access yet"))?;
let req = parse_streaming_body(
&api_key,
req,
&mut content_sha256,
&garage.config.s3_api.s3_region,
"s3",
)?;
let (req, api_key, content_sha256) = verify_request(&garage, req, "s3").await?;
let bucket_name = match bucket_name {
None => {

26
src/api/s3/post_object.rs
View file

@ -21,7 +21,7 @@ use crate::s3::cors::*;
use crate::s3::error::*;
use crate::s3::put::{get_headers, save_stream};
use crate::s3::xml as s3_xml;
use crate::signature::payload::{parse_date, verify_v4};
use crate::signature::payload::{verify_v4, Authorization};
pub async fn handle_post_object(
garage: Arc<Garage>,
@ -88,22 +88,11 @@ pub async fn handle_post_object(
.get("key")
.ok_or_bad_request("No key was provided")?
.to_str()?;
let credential = params
.get("x-amz-credential")
.ok_or_else(|| Error::forbidden("Garage does not support anonymous access yet"))?
.to_str()?;
let policy = params
.get("policy")
.ok_or_bad_request("No policy was provided")?
.to_str()?;
let signature = params
.get("x-amz-signature")
.ok_or_bad_request("No signature was provided")?
.to_str()?;
let date = params
.get("x-amz-date")
.ok_or_bad_request("No date was provided")?
.to_str()?;
let authorization = Authorization::parse_form(&params)?;
let key = if key.contains("${filename}") {
// if no filename is provided, don't replace. This matches the behavior of AWS.
@ -116,16 +105,7 @@ pub async fn handle_post_object(
key.to_owned()
};
let date = parse_date(date)?;
let api_key = verify_v4(
&garage,
"s3",
credential,
&date,
signature,
policy.as_bytes(),
)
.await?;
let api_key = verify_v4(&garage, "s3", &authorization, policy.as_bytes()).await?;
let bucket_id = garage
.bucket_helper()

29
src/api/signature/mod.rs
View file

@ -2,19 +2,44 @@ use chrono::{DateTime, Utc};
use hmac::{Hmac, Mac};
use sha2::Sha256;
use hyper::{body::Incoming as IncomingBody, Request};
use garage_model::garage::Garage;
use garage_model::key_table::Key;
use garage_util::data::{sha256sum, Hash};
use error::*;
pub mod error;
pub mod payload;
pub mod streaming;
use error::*;
pub const SHORT_DATE: &str = "%Y%m%d";
pub const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";
type HmacSha256 = Hmac<Sha256>;
pub async fn verify_request(
garage: &Garage,
mut req: Request<IncomingBody>,
service: &'static str,
) -> Result<(Request<streaming::ReqBody>, Key, Option<Hash>), Error> {
let (api_key, mut content_sha256) =
payload::check_payload_signature(&garage, &mut req, service).await?;
let api_key =
api_key.ok_or_else(|| Error::forbidden("Garage does not support anonymous access yet"))?;
let req = streaming::parse_streaming_body(
&api_key,
req,
&mut content_sha256,
&garage.config.s3_api.s3_region,
service,
)?;
Ok((req, api_key, content_sha256))
}
pub fn verify_signed_content(expected_sha256: Hash, body: &[u8]) -> Result<(), Error> {
if expected_sha256 != sha256sum(body) {
return Err(Error::bad_request(

604
src/api/signature/payload.rs
View file

@ -1,7 +1,9 @@
use std::collections::HashMap;
use std::convert::TryFrom;
use chrono::{DateTime, Duration, NaiveDateTime, TimeZone, Utc};
use hmac::Mac;
use hyper::header::{HeaderMap, HeaderName, HeaderValue, AUTHORIZATION, CONTENT_TYPE, HOST};
use hyper::{body::Incoming as IncomingBody, Method, Request};
use sha2::{Digest, Sha256};
@ -17,66 +19,91 @@ use super::{compute_scope, signing_hmac};
use crate::encoding::uri_encode;
use crate::signature::error::*;
pub const X_AMZ_ALGORITHM: HeaderName = HeaderName::from_static("x-amz-algorithm");
pub const X_AMZ_CREDENTIAL: HeaderName = HeaderName::from_static("x-amz-credential");
pub const X_AMZ_DATE: HeaderName = HeaderName::from_static("x-amz-date");
pub const X_AMZ_EXPIRES: HeaderName = HeaderName::from_static("x-amz-expires");
pub const X_AMZ_SIGNEDHEADERS: HeaderName = HeaderName::from_static("x-amz-signedheaders");
pub const X_AMZ_SIGNATURE: HeaderName = HeaderName::from_static("x-amz-signature");
pub const X_AMZ_CONTENT_SH256: HeaderName = HeaderName::from_static("x-amz-content-sha256");
pub const AWS4_HMAC_SHA256: &str = "AWS4-HMAC-SHA256";
pub const UNSIGNED_PAYLOAD: &str = "UNSIGNED-PAYLOAD";
pub const STREAMING_AWS4_HMAC_SHA256_PAYLOAD: &str = "STREAMING-AWS4-HMAC-SHA256-PAYLOAD";
pub type QueryMap = HashMap<String, String>;
pub async fn check_payload_signature(
garage: &Garage,
request: &mut Request<IncomingBody>,
service: &'static str,
request: &Request<IncomingBody>,
) -> Result<(Option<Key>, Option<Hash>), Error> {
let mut headers = HashMap::new();
for (key, val) in request.headers() {
headers.insert(key.to_string(), val.to_str()?.to_string());
}
if let Some(query) = request.uri().query() {
let query_pairs = url::form_urlencoded::parse(query.as_bytes());
for (key, val) in query_pairs {
headers.insert(key.to_lowercase(), val.to_string());
}
}
let query = parse_query_map(request.uri())?;
let authorization = if let Some(authorization) = headers.get("authorization") {
parse_authorization(authorization, &headers)?
} else if let Some(algorithm) = headers.get("x-amz-algorithm") {
parse_query_authorization(algorithm, &headers)?
if query.contains_key(X_AMZ_ALGORITHM.as_str()) {
// We check for presigned-URL-style authentification first, because
// the browser or someting else could inject an Authorization header
// that is totally unrelated to AWS signatures.
check_presigned_signature(garage, service, request, query).await
} else if request.headers().contains_key(AUTHORIZATION) {
check_standard_signature(garage, service, request, query).await
} else {
let content_sha256 = headers.get("x-amz-content-sha256");
if let Some(content_sha256) = content_sha256.filter(|c| "UNSIGNED-PAYLOAD" != c.as_str()) {
// Unsigned (anonymous) request
let content_sha256 = request
.headers()
.get("x-amz-content-sha256")
.filter(|c| c.as_bytes() != UNSIGNED_PAYLOAD.as_bytes());
if let Some(content_sha256) = content_sha256 {
let sha256 = hex::decode(content_sha256)
.ok()
.and_then(|bytes| Hash::try_from(&bytes))
.ok_or_bad_request("Invalid content sha256 hash")?;
return Ok((None, Some(sha256)));
Ok((None, Some(sha256)))
} else {
return Ok((None, None));
Ok((None, None))
}
};
}
}
async fn check_standard_signature(
garage: &Garage,
service: &'static str,
request: &Request<IncomingBody>,
query: QueryMap,
) -> Result<(Option<Key>, Option<Hash>), Error> {
let authorization = Authorization::parse_header(request.headers())?;
// Verify that all necessary request headers are included in signed_headers
// For standard AWSv4 signatures, the following must be included:
// - the Host header (mandatory)
// - the Content-Type header, if it is used in the request
// - all x-amz-* headers used in the request
let signed_headers = split_signed_headers(&authorization)?;
verify_signed_headers(request.headers(), &signed_headers, &[CONTENT_TYPE])?;
let canonical_request = canonical_request(
service,
request.method(),
request.uri(),
&headers,
&authorization.signed_headers,
request.uri().path(),
&query,
request.headers(),
&signed_headers,
&authorization.content_sha256,
)?;
let string_to_sign = string_to_sign(
&authorization.date,
&authorization.scope,
&canonical_request,
);
let (_, scope) = parse_credential(&authorization.credential)?;
let string_to_sign = string_to_sign(&authorization.date, &scope, &canonical_request);
trace!("canonical request:\n{}", canonical_request);
trace!("string to sign:\n{}", string_to_sign);
let key = verify_v4(
garage,
service,
&authorization.credential,
&authorization.date,
&authorization.signature,
string_to_sign.as_bytes(),
)
.await?;
let key = verify_v4(garage, service, &authorization, string_to_sign.as_bytes()).await?;
let content_sha256 = if authorization.content_sha256 == "UNSIGNED-PAYLOAD" {
let content_sha256 = if authorization.content_sha256 == UNSIGNED_PAYLOAD {
None
} else if authorization.content_sha256 == "STREAMING-AWS4-HMAC-SHA256-PAYLOAD" {
} else if authorization.content_sha256 == STREAMING_AWS4_HMAC_SHA256_PAYLOAD {
let bytes = hex::decode(authorization.signature).ok_or_bad_request("Invalid signature")?;
Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid signature")?)
} else {
@ -88,124 +115,96 @@ pub async fn check_payload_signature(
Ok((Some(key), content_sha256))
}
struct Authorization {
credential: String,
signed_headers: String,
signature: String,
content_sha256: String,
date: DateTime<Utc>,
async fn check_presigned_signature(
garage: &Garage,
service: &'static str,
request: &mut Request<IncomingBody>,
mut query: QueryMap,
) -> Result<(Option<Key>, Option<Hash>), Error> {
let algorithm = query.get(X_AMZ_ALGORITHM.as_str()).unwrap();
let authorization = Authorization::parse_presigned(algorithm, &query)?;
// Verify that all necessary request headers are included in signed_headers
// For AWSv4 pre-signed URLs, the following must be incldued:
// - the Host header (mandatory)
// - all x-amz-* headers used in the request
let signed_headers = split_signed_headers(&authorization)?;
verify_signed_headers(request.headers(), &signed_headers, &[])?;
// The X-Amz-Signature value is passed as a query parameter,
// but the signature cannot be computed from a string that contains itself.
// AWS specifies that all query params except X-Amz-Signature are included
// in the canonical request.
query.remove(X_AMZ_SIGNATURE.as_str());
let canonical_request = canonical_request(
service,
request.method(),
request.uri().path(),
&query,
request.headers(),
&signed_headers,
&authorization.content_sha256,
)?;
let string_to_sign = string_to_sign(
&authorization.date,
&authorization.scope,
&canonical_request,
);
trace!("canonical request (presigned url):\n{}", canonical_request);
trace!("string to sign (presigned url):\n{}", string_to_sign);
let key = verify_v4(garage, service, &authorization, string_to_sign.as_bytes()).await?;
// In the page on presigned URLs, AWS specifies that if a signed query
// parameter and a signed header of the same name have different values,
// then an InvalidRequest error is raised.
let headers_mut = request.headers_mut();
for (name, value) in query.iter() {
let name =
HeaderName::from_bytes(name.as_bytes()).ok_or_bad_request("Invalid header name")?;
if let Some(existing) = headers_mut.get(&name) {
if signed_headers.contains(&name) && existing.as_bytes() != value.as_bytes() {
return Err(Error::bad_request(format!(
"Conflicting values for `{}` in query parameters and request headers",
name
)));
}
}
if name.as_str().starts_with("x-amz-") {
// Query parameters that start by x-amz- are actually intended to stand in for
// headers that can't be added at the time the request is made.
// What we do is just add them to the Request object as regular headers,
// that will be handled downstream as if they were included like in a normal request.
// (Here we allow such query parameters to override headers with the same name
// that are not signed, however there is not much reason that this would happen)
headers_mut.insert(
name,
HeaderValue::from_bytes(value.as_bytes())
.ok_or_bad_request("invalid query parameter value")?,
);
}
}
// Presigned URLs always use UNSIGNED-PAYLOAD,
// so there is no sha256 hash to return.
Ok((Some(key), None))
}
fn parse_authorization(
authorization: &str,
headers: &HashMap<String, String>,
) -> Result<Authorization, Error> {
let first_space = authorization
.find(' ')
.ok_or_bad_request("Authorization field to short")?;
let (auth_kind, rest) = authorization.split_at(first_space);
if auth_kind != "AWS4-HMAC-SHA256" {
return Err(Error::bad_request("Unsupported authorization method"));
pub fn parse_query_map(uri: &http::uri::Uri) -> Result<QueryMap, Error> {
let mut query = QueryMap::new();
if let Some(query_str) = uri.query() {
let query_pairs = url::form_urlencoded::parse(query_str.as_bytes());
for (key, val) in query_pairs {
if query.insert(key.to_string(), val.into_owned()).is_some() {
return Err(Error::bad_request(format!(
"duplicate query parameter: `{}`",
key
)));
}
}
}
let mut auth_params = HashMap::new();
for auth_part in rest.split(',') {
let auth_part = auth_part.trim();
let eq = auth_part
.find('=')
.ok_or_bad_request("Field without value in authorization header")?;
let (key, value) = auth_part.split_at(eq);
auth_params.insert(key.to_string(), value.trim_start_matches('=').to_string());
}
let cred = auth_params
.get("Credential")
.ok_or_bad_request("Could not find Credential in Authorization field")?;
let content_sha256 = headers
.get("x-amz-content-sha256")
.ok_or_bad_request("Missing X-Amz-Content-Sha256 field")?;
let date = headers
.get("x-amz-date")
.ok_or_bad_request("Missing X-Amz-Date field")
.map_err(Error::from)
.and_then(|d| parse_date(d))?;
if Utc::now() - date > Duration::hours(24) {
return Err(Error::bad_request("Date is too old".to_string()));
}
let auth = Authorization {
credential: cred.to_string(),
signed_headers: auth_params
.get("SignedHeaders")
.ok_or_bad_request("Could not find SignedHeaders in Authorization field")?
.to_string(),
signature: auth_params
.get("Signature")
.ok_or_bad_request("Could not find Signature in Authorization field")?
.to_string(),
content_sha256: content_sha256.to_string(),
date,
};
Ok(auth)
}
fn parse_query_authorization(
algorithm: &str,
headers: &HashMap<String, String>,
) -> Result<Authorization, Error> {
if algorithm != "AWS4-HMAC-SHA256" {
return Err(Error::bad_request(
"Unsupported authorization method".to_string(),
));
}
let cred = headers
.get("x-amz-credential")
.ok_or_bad_request("X-Amz-Credential not found in query parameters")?;
let signed_headers = headers
.get("x-amz-signedheaders")
.ok_or_bad_request("X-Amz-SignedHeaders not found in query parameters")?;
let signature = headers
.get("x-amz-signature")
.ok_or_bad_request("X-Amz-Signature not found in query parameters")?;
let content_sha256 = headers
.get("x-amz-content-sha256")
.map(|x| x.as_str())
.unwrap_or("UNSIGNED-PAYLOAD");
let duration = headers
.get("x-amz-expires")
.ok_or_bad_request("X-Amz-Expires not found in query parameters")?
.parse()
.map_err(|_| Error::bad_request("X-Amz-Expires is not a number".to_string()))?;
if duration > 7 * 24 * 3600 {
return Err(Error::bad_request(
"X-Amz-Expires may not exceed a week".to_string(),
));
}
let date = headers
.get("x-amz-date")
.ok_or_bad_request("Missing X-Amz-Date field")
.map_err(Error::from)
.and_then(|d| parse_date(d))?;
if Utc::now() - date > Duration::seconds(duration) {
return Err(Error::bad_request("Date is too old".to_string()));
}
Ok(Authorization {
credential: cred.to_string(),
signed_headers: signed_headers.to_string(),
signature: signature.to_string(),
content_sha256: content_sha256.to_string(),
date,
})
Ok(query)
}
fn parse_credential(cred: &str) -> Result<(String, String), Error> {
@ -219,11 +218,43 @@ fn parse_credential(cred: &str) -> Result<(String, String), Error> {
))
}
fn split_signed_headers(authorization: &Authorization) -> Result<Vec<HeaderName>, Error> {
let mut signed_headers = authorization
.signed_headers
.split(';')
.map(HeaderName::try_from)
.collect::<Result<Vec<HeaderName>, _>>()
.ok_or_bad_request("invalid header name")?;
signed_headers.sort_by(|h1, h2| h1.as_str().cmp(h2.as_str()));
Ok(signed_headers)
}
fn verify_signed_headers(
headers: &HeaderMap,
signed_headers: &[HeaderName],
extra_headers: &[HeaderName],
) -> Result<(), Error> {
if !signed_headers.contains(&HOST) {
return Err(Error::bad_request("Header `Host` should be signed"));
}
for (name, _) in headers.iter() {
if name.as_str().starts_with("x-amz-") || extra_headers.contains(name) {
if !signed_headers.contains(name) {
return Err(Error::bad_request(format!(
"Header `{}` should be signed",
name
)));
}
}
}
Ok(())
}
pub fn string_to_sign(datetime: &DateTime<Utc>, scope_string: &str, canonical_req: &str) -> String {
let mut hasher = Sha256::default();
hasher.update(canonical_req.as_bytes());
[
"AWS4-HMAC-SHA256",
AWS4_HMAC_SHA256,
&datetime.format(LONG_DATETIME).to_string(),
scope_string,
&hex::encode(hasher.finalize().as_slice()),
@ -234,11 +265,12 @@ pub fn string_to_sign(datetime: &DateTime<Utc>, scope_string: &str, canonical_re
pub fn canonical_request(
service: &'static str,
method: &Method,
uri: &hyper::Uri,
headers: &HashMap<String, String>,
signed_headers: &str,
canonical_uri: &str,
query: &QueryMap,
headers: &HeaderMap,
signed_headers: &[HeaderName],
content_sha256: &str,
) -> String {
) -> Result<String, Error> {
// There seems to be evidence that in AWSv4 signatures, the path component is url-encoded
// a second time when building the canonical request, as specified in this documentation page:
// -> https://docs.aws.amazon.com/rolesanywhere/latest/userguide/authentication-sign-process.html
@ -268,49 +300,46 @@ pub fn canonical_request(
// it mentions it in the comments (same link to the souce code as above).
// We make the explicit choice of NOT normalizing paths in the K2V API because doing so
// would make non-normalized paths invalid K2V partition keys, and we don't want that.
let path: std::borrow::Cow<str> = if service != "s3" {
uri_encode(uri.path(), false).into()
let canonical_uri: std::borrow::Cow<str> = if service != "s3" {
uri_encode(canonical_uri, false).into()
} else {
uri.path().into()
canonical_uri.into()
};
[
method.as_str(),
&path,
&canonical_query_string(uri),
&canonical_header_string(headers, signed_headers),
"",
signed_headers,
content_sha256,
]
.join("\n")
}
fn canonical_header_string(headers: &HashMap<String, String>, signed_headers: &str) -> String {
let signed_headers_vec = signed_headers.split(';').collect::<Vec<_>>();
let mut items = headers
.iter()
.filter(|(key, _)| signed_headers_vec.contains(&key.as_str()))
.collect::<Vec<_>>();
items.sort_by(|(k1, _), (k2, _)| k1.cmp(k2));
items
.iter()
.map(|(key, value)| key.to_lowercase() + ":" + value.trim())
.collect::<Vec<_>>()
.join("\n")
}
fn canonical_query_string(uri: &hyper::Uri) -> String {
if let Some(query) = uri.query() {
let query_pairs = url::form_urlencoded::parse(query.as_bytes());
let mut items = query_pairs
.filter(|(key, _)| key != "X-Amz-Signature")
.map(|(key, value)| uri_encode(&key, true) + "=" + &uri_encode(&value, true))
.collect::<Vec<_>>();
// Canonical query string from passed HeaderMap
let canonical_query_string = {
let mut items = Vec::with_capacity(query.len());
for (key, value) in query.iter() {
items.push(uri_encode(&key, true) + "=" + &uri_encode(&value, true));
}
items.sort();
items.join("&")
} else {
"".to_string()
}
};
// Canonical header string calculated from signed headers
let canonical_header_string = signed_headers
.iter()
.map(|name| {
let value = headers
.get(name)
.ok_or_bad_request(format!("signed header `{}` is not present", name))?
.to_str()?;
Ok(format!("{}:{}", name.as_str(), value.trim()))
})
.collect::<Result<Vec<String>, Error>>()?
.join("\n");
let signed_headers = signed_headers.join(";");
let list = [
method.as_str(),
&canonical_uri,
&canonical_query_string,
&canonical_header_string,
"",
&signed_headers,
content_sha256,
];
Ok(list.join("\n"))
}
pub fn parse_date(date: &str) -> Result<DateTime<Utc>, Error> {
@ -322,28 +351,24 @@ pub fn parse_date(date: &str) -> Result<DateTime<Utc>, Error> {
pub async fn verify_v4(
garage: &Garage,
service: &str,
credential: &str,
date: &DateTime<Utc>,
signature: &str,
auth: &Authorization,
payload: &[u8],
) -> Result<Key, Error> {
let (key_id, scope) = parse_credential(credential)?;
let scope_expected = compute_scope(date, &garage.config.s3_api.s3_region, service);
if scope != scope_expected {
return Err(Error::AuthorizationHeaderMalformed(scope.to_string()));
let scope_expected = compute_scope(&auth.date, &garage.config.s3_api.s3_region, service);
if auth.scope != scope_expected {
return Err(Error::AuthorizationHeaderMalformed(auth.scope.to_string()));
}
let key = garage
.key_table
.get(&EmptyKey, &key_id)
.get(&EmptyKey, &auth.key_id)
.await?
.filter(|k| !k.state.is_deleted())
.ok_or_else(|| Error::forbidden(format!("No such key: {}", &key_id)))?;
.ok_or_else(|| Error::forbidden(format!("No such key: {}", &auth.key_id)))?;
let key_p = key.params().unwrap();
let mut hmac = signing_hmac(
date,
&auth.date,
&key_p.secret_key,
&garage.config.s3_api.s3_region,
service,
@ -351,9 +376,176 @@ pub async fn verify_v4(
.ok_or_internal_error("Unable to build signing HMAC")?;
hmac.update(payload);
let our_signature = hex::encode(hmac.finalize().into_bytes());
if signature != our_signature {
if auth.signature != our_signature {
return Err(Error::forbidden("Invalid signature".to_string()));
}
Ok(key)
}
// ============ Authorization header, or X-Amz-* query params =========
pub struct Authorization {
key_id: String,
scope: String,
signed_headers: String,
signature: String,
content_sha256: String,
date: DateTime<Utc>,
}
impl Authorization {
fn parse_header(headers: &HeaderMap) -> Result<Self, Error> {
let authorization = headers
.get(AUTHORIZATION)
.ok_or_bad_request("Missing authorization header")?
.to_str()?;
let (auth_kind, rest) = authorization
.split_once(' ')
.ok_or_bad_request("Authorization field to short")?;
if auth_kind != AWS4_HMAC_SHA256 {
return Err(Error::bad_request("Unsupported authorization method"));
}
let mut auth_params = HashMap::new();
for auth_part in rest.split(',') {
let auth_part = auth_part.trim();
let eq = auth_part
.find('=')
.ok_or_bad_request("Field without value in authorization header")?;
let (key, value) = auth_part.split_at(eq);
auth_params.insert(key.to_string(), value.trim_start_matches('=').to_string());
}
let cred = auth_params
.get("Credential")
.ok_or_bad_request("Could not find Credential in Authorization field")?;
let signed_headers = auth_params
.get("SignedHeaders")
.ok_or_bad_request("Could not find SignedHeaders in Authorization field")?
.to_string();
let signature = auth_params
.get("Signature")
.ok_or_bad_request("Could not find Signature in Authorization field")?
.to_string();
let content_sha256 = headers
.get(X_AMZ_CONTENT_SH256)
.ok_or_bad_request("Missing X-Amz-Content-Sha256 field")?;
let date = headers
.get(X_AMZ_DATE)
.ok_or_bad_request("Missing X-Amz-Date field")
.map_err(Error::from)?
.to_str()?;
let date = parse_date(date)?;
if Utc::now() - date > Duration::hours(24) {
return Err(Error::bad_request("Date is too old".to_string()));
}
let (key_id, scope) = parse_credential(cred)?;
let auth = Authorization {
key_id,
scope,
signed_headers,
signature,
content_sha256: content_sha256.to_str()?.to_string(),
date,
};
Ok(auth)
}
fn parse_presigned(algorithm: &str, query: &QueryMap) -> Result<Self, Error> {
if algorithm != AWS4_HMAC_SHA256 {
return Err(Error::bad_request(
"Unsupported authorization method".to_string(),
));
}
let cred = query
.get(X_AMZ_CREDENTIAL.as_str())
.ok_or_bad_request("X-Amz-Credential not found in query parameters")?;
let signed_headers = query
.get(X_AMZ_SIGNEDHEADERS.as_str())
.ok_or_bad_request("X-Amz-SignedHeaders not found in query parameters")?;
let signature = query
.get(X_AMZ_SIGNATURE.as_str())
.ok_or_bad_request("X-Amz-Signature not found in query parameters")?;
let duration = query
.get(X_AMZ_EXPIRES.as_str())
.ok_or_bad_request("X-Amz-Expires not found in query parameters")?
.parse()
.map_err(|_| Error::bad_request("X-Amz-Expires is not a number".to_string()))?;
if duration > 7 * 24 * 3600 {
return Err(Error::bad_request(
"X-Amz-Expires may not exceed a week".to_string(),
));
}
let date = query
.get(X_AMZ_DATE.as_str())
.ok_or_bad_request("Missing X-Amz-Date field")?;
let date = parse_date(date)?;
if Utc::now() - date > Duration::seconds(duration) {
return Err(Error::bad_request("Date is too old".to_string()));
}
let (key_id, scope) = parse_credential(cred)?;
Ok(Authorization {
key_id,
scope,
signed_headers: signed_headers.to_string(),
signature: signature.to_string(),
content_sha256: UNSIGNED_PAYLOAD.to_string(),
date,
})
}
pub(crate) fn parse_form(params: &HeaderMap) -> Result<Self, Error> {
let algorithm = params
.get(X_AMZ_ALGORITHM)
.ok_or_bad_request("Missing X-Amz-Algorithm header")?
.to_str()?;
if algorithm != AWS4_HMAC_SHA256 {
return Err(Error::bad_request(
"Unsupported authorization method".to_string(),
));
}
let credential = params
.get(X_AMZ_CREDENTIAL)
.ok_or_else(|| Error::forbidden("Garage does not support anonymous access yet"))?
.to_str()?;
let signature = params
.get(X_AMZ_SIGNATURE)
.ok_or_bad_request("No signature was provided")?
.to_str()?
.to_string();
let date = params
.get(X_AMZ_DATE)
.ok_or_bad_request("No date was provided")?
.to_str()?;
let date = parse_date(date)?;
if Utc::now() - date > Duration::hours(24) {
return Err(Error::bad_request("Date is too old".to_string()));
}
let (key_id, scope) = parse_credential(credential)?;
let auth = Authorization {
key_id,
scope,
signed_headers: "".to_string(),
signature,
content_sha256: UNSIGNED_PAYLOAD.to_string(),
date,
};
Ok(auth)
}
}

13
src/api/signature/streaming.rs
View file

@ -15,6 +15,11 @@ use super::{compute_scope, sha256sum, HmacSha256, LONG_DATETIME};
use crate::helpers::*;
use crate::signature::error::*;
use crate::signature::payload::{
STREAMING_AWS4_HMAC_SHA256_PAYLOAD, X_AMZ_CONTENT_SH256, X_AMZ_DATE,
};
pub const AWS4_HMAC_SHA256_PAYLOAD: &str = "AWS4-HMAC-SHA256-PAYLOAD";
pub type ReqBody = BoxBody<Error>;
@ -25,8 +30,8 @@ pub fn parse_streaming_body(
region: &str,
service: &str,
) -> Result<Request<ReqBody>, Error> {
match req.headers().get("x-amz-content-sha256") {
Some(header) if header == "STREAMING-AWS4-HMAC-SHA256-PAYLOAD" => {
match req.headers().get(X_AMZ_CONTENT_SH256) {
Some(header) if header == STREAMING_AWS4_HMAC_SHA256_PAYLOAD => {
let signature = content_sha256
.take()
.ok_or_bad_request("No signature provided")?;
@ -39,7 +44,7 @@ pub fn parse_streaming_body(
let date = req
.headers()
.get("x-amz-date")
.get(X_AMZ_DATE)
.ok_or_bad_request("Missing X-Amz-Date field")?
.to_str()?;
let date: NaiveDateTime = NaiveDateTime::parse_from_str(date, LONG_DATETIME)
@ -75,7 +80,7 @@ fn compute_streaming_payload_signature(
content_sha256: Hash,
) -> Result<Hash, Error> {
let string_to_sign = [
"AWS4-HMAC-SHA256-PAYLOAD",
AWS4_HMAC_SHA256_PAYLOAD,
&date.format(LONG_DATETIME).to_string(),
scope,
&hex::encode(previous_signature),

83
src/garage/tests/common/custom_requester.rs
View file

@ -1,12 +1,15 @@
#![allow(dead_code)]
use std::collections::HashMap;
use std::convert::TryFrom;
use std::convert::{TryFrom, TryInto};
use chrono::{offset::Utc, DateTime};
use hmac::{Hmac, Mac};
use http_body_util::BodyExt;
use http_body_util::Full as FullBody;
use hyper::header::{
HeaderMap, HeaderName, HeaderValue, AUTHORIZATION, CONTENT_ENCODING, CONTENT_LENGTH, HOST,
};
use hyper::{Method, Request, Response, Uri};
use hyper_util::client::legacy::{connect::HttpConnector, Client};
use hyper_util::rt::TokioExecutor;
@ -173,54 +176,85 @@ impl<'a> RequestBuilder<'a> {
.unwrap();
let streaming_signer = signer.clone();
let mut all_headers = self.signed_headers.clone();
let mut all_headers = self
.signed_headers
.iter()
.map(|(k, v)| {
(
HeaderName::try_from(k).expect("invalid header name"),
HeaderValue::try_from(v).expect("invalid header value"),
)
})
.collect::<HeaderMap>();
let date = now.format(signature::LONG_DATETIME).to_string();
all_headers.insert("x-amz-date".to_owned(), date);
all_headers.insert("host".to_owned(), host);
all_headers.insert(
signature::payload::X_AMZ_DATE,
HeaderValue::from_str(&date).unwrap(),
);
all_headers.insert(HOST, HeaderValue::from_str(&host).unwrap());
let body_sha = match self.body_signature {
BodySignature::Unsigned => "UNSIGNED-PAYLOAD".to_owned(),
BodySignature::Classic => hex::encode(garage_util::data::sha256sum(&self.body)),
BodySignature::Streaming(size) => {
all_headers.insert("content-encoding".to_owned(), "aws-chunked".to_owned());
all_headers.insert(
"x-amz-decoded-content-length".to_owned(),
self.body.len().to_string(),
CONTENT_ENCODING,
HeaderValue::from_str("aws-chunked").unwrap(),
);
all_headers.insert(
HeaderName::from_static("x-amz-decoded-content-length"),
HeaderValue::from_str(&self.body.len().to_string()).unwrap(),
);
// Get lenght of body by doing the conversion to a streaming body with an
// invalid signature (we don't know the seed) just to get its length. This
// is a pretty lazy and inefficient way to do it, but it's enought for test
// code.
all_headers.insert(
"content-length".to_owned(),
CONTENT_LENGTH,
to_streaming_body(&self.body, size, String::new(), signer.clone(), now, "")
.len()
.to_string(),
.to_string()
.try_into()
.unwrap(),
);
"STREAMING-AWS4-HMAC-SHA256-PAYLOAD".to_owned()
}
};
all_headers.insert("x-amz-content-sha256".to_owned(), body_sha.clone());
all_headers.insert(
signature::payload::X_AMZ_CONTENT_SH256,
HeaderValue::from_str(&body_sha).unwrap(),
);
let mut signed_headers = all_headers
.keys()
.map(|k| k.as_ref())
.collect::<Vec<&str>>();
signed_headers.sort();
let signed_headers = signed_headers.join(";");
let mut signed_headers = all_headers.keys().cloned().collect::<Vec<_>>();
signed_headers.sort_by(|h1, h2| h1.as_str().cmp(h2.as_str()));
let signed_headers_str = signed_headers
.iter()
.map(ToString::to_string)
.collect::<Vec<_>>()
.join(";");
all_headers.extend(self.unsigned_headers.clone());
all_headers.extend(self.unsigned_headers.iter().map(|(k, v)| {
(
HeaderName::try_from(k).expect("invalid header name"),
HeaderValue::try_from(v).expect("invalid header value"),
)
}));
let uri = Uri::try_from(&uri).unwrap();
let query = signature::payload::parse_query_map(&uri).unwrap();
let canonical_request = signature::payload::canonical_request(
self.service,
&self.method,
&Uri::try_from(&uri).unwrap(),
uri.path(),
&query,
&all_headers,
&signed_headers,
&body_sha,
);
)
.unwrap();
let string_to_sign = signature::payload::string_to_sign(&now, &scope, &canonical_request);
@ -228,14 +262,15 @@ impl<'a> RequestBuilder<'a> {
let signature = hex::encode(signer.finalize().into_bytes());
let authorization = format!(
"AWS4-HMAC-SHA256 Credential={}/{},SignedHeaders={},Signature={}",
self.requester.key.id, scope, signed_headers, signature
self.requester.key.id, scope, signed_headers_str, signature
);
all_headers.insert(
AUTHORIZATION,
HeaderValue::from_str(&authorization).unwrap(),
);
all_headers.insert("authorization".to_owned(), authorization);
let mut request = Request::builder();
for (k, v) in all_headers {
request = request.header(k, v);
}
*request.headers_mut().unwrap() = all_headers;
let body = if let BodySignature::Streaming(size) = self.body_signature {
to_streaming_body(&self.body, size, signature, streaming_signer, now, &scope)

2
src/garage/tests/s3/streaming_signature.rs
View file

@ -26,7 +26,7 @@ async fn test_putobject_streaming() {
.builder(bucket.clone())
.method(Method::PUT)
.path(STD_KEY.to_owned())
.unsigned_headers(headers)
.signed_headers(headers)
.vhost_style(true)
.body(vec![])
.body_signature(BodySignature::Streaming(10))