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[backport-735-v0.8.x] backport AWS signature verification refactoring

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This commit is contained in:
Alex 2024-03-01 12:35:08 +01:00
parent f01883794e
commit 610af71e36
Signed by: lx
GPG key ID: 0E496D15096376BE
6 changed files with 429 additions and 257 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::generic_server::*;
use crate::k2v::error::*; use crate::k2v::error::*;
use crate::signature::payload::check_payload_signature; use crate::signature::verify_request;
use crate::signature::streaming::*;
use crate::helpers::*; use crate::helpers::*;
use crate::k2v::batch::*; use crate::k2v::batch::*;
@ -82,17 +81,7 @@ impl ApiHandler for K2VApiServer {
.ok_or_bad_request("Error handling OPTIONS")?); .ok_or_bad_request("Error handling OPTIONS")?);
} }
let (api_key, mut content_sha256) = check_payload_signature(&garage, "k2v", &req).await?; let (req, api_key, _content_shaa256) = verify_request(&garage, req, "k2v").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 bucket_id = garage let bucket_id = garage
.bucket_helper() .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::generic_server::*;
use crate::s3::error::*; use crate::s3::error::*;
use crate::signature::payload::check_payload_signature; use crate::signature::verify_request;
use crate::signature::streaming::*;
use crate::helpers::*; use crate::helpers::*;
use crate::s3::bucket::*; use crate::s3::bucket::*;
@ -119,17 +118,7 @@ impl ApiHandler for S3ApiServer {
return handle_options_s3api(garage, &req, bucket_name).await; return handle_options_s3api(garage, &req, bucket_name).await;
} }
let (api_key, mut content_sha256) = check_payload_signature(&garage, "s3", &req).await?; let (req, api_key, content_sha256) = verify_request(&garage, req, "s3").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 bucket_name = match bucket_name { let bucket_name = match bucket_name {
None => { None => {

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

@ -19,7 +19,7 @@ use crate::s3::cors::*;
use crate::s3::error::*; use crate::s3::error::*;
use crate::s3::put::{get_headers, save_stream}; use crate::s3::put::{get_headers, save_stream};
use crate::s3::xml as s3_xml; 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( pub async fn handle_post_object(
garage: Arc<Garage>, garage: Arc<Garage>,
@ -85,22 +85,11 @@ pub async fn handle_post_object(
.get("key") .get("key")
.ok_or_bad_request("No key was provided")? .ok_or_bad_request("No key was provided")?
.to_str()?; .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 let policy = params
.get("policy") .get("policy")
.ok_or_bad_request("No policy was provided")? .ok_or_bad_request("No policy was provided")?
.to_str()?; .to_str()?;
let signature = params let authorization = Authorization::parse_form(&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 key = if key.contains("${filename}") { let key = if key.contains("${filename}") {
// if no filename is provided, don't replace. This matches the behavior of AWS. // if no filename is provided, don't replace. This matches the behavior of AWS.
@ -113,16 +102,7 @@ pub async fn handle_post_object(
key.to_owned() key.to_owned()
}; };
let date = parse_date(date)?; let api_key = verify_v4(&garage, "s3", &authorization, policy.as_bytes()).await?;
let api_key = verify_v4(
&garage,
"s3",
credential,
&date,
signature,
policy.as_bytes(),
)
.await?;
let bucket_id = garage let bucket_id = garage
.bucket_helper() .bucket_helper()

25
src/api/signature/mod.rs
View file

@ -2,6 +2,10 @@ use chrono::{DateTime, Utc};
use hmac::{Hmac, Mac}; use hmac::{Hmac, Mac};
use sha2::Sha256; use sha2::Sha256;
use hyper::{body::Body, Request};
use garage_model::garage::Garage;
use garage_model::key_table::Key;
use garage_util::data::{sha256sum, Hash}; use garage_util::data::{sha256sum, Hash};
pub mod error; pub mod error;
@ -15,6 +19,27 @@ pub const LONG_DATETIME: &str = "%Y%m%dT%H%M%SZ";
type HmacSha256 = Hmac<Sha256>; type HmacSha256 = Hmac<Sha256>;
pub async fn verify_request(
garage: &Garage,
mut req: Request<Body>,
service: &'static str,
) -> Result<(Request<Body>, 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> { pub fn verify_signed_content(expected_sha256: Hash, body: &[u8]) -> Result<(), Error> {
if expected_sha256 != sha256sum(body) { if expected_sha256 != sha256sum(body) {
return Err(Error::bad_request( return Err(Error::bad_request(

603
src/api/signature/payload.rs
View file

@ -1,8 +1,10 @@
use std::collections::HashMap; use std::collections::HashMap;
use std::convert::TryFrom;
use chrono::{DateTime, Duration, NaiveDateTime, Utc}; use chrono::{DateTime, Duration, NaiveDateTime, Utc};
use hmac::Mac; use hmac::Mac;
use hyper::{Body, Method, Request}; use hyper::header::{HeaderMap, HeaderName, HeaderValue, AUTHORIZATION, HOST};
use hyper::{body::Body, Method, Request};
use sha2::{Digest, Sha256}; use sha2::{Digest, Sha256};
use garage_table::*; use garage_table::*;
@ -17,66 +19,91 @@ use super::{compute_scope, signing_hmac};
use crate::encoding::uri_encode; use crate::encoding::uri_encode;
use crate::signature::error::*; 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( pub async fn check_payload_signature(
garage: &Garage, garage: &Garage,
request: &mut Request<Body>,
service: &'static str, service: &'static str,
request: &Request<Body>,
) -> Result<(Option<Key>, Option<Hash>), Error> { ) -> Result<(Option<Key>, Option<Hash>), Error> {
let mut headers = HashMap::new(); let query = parse_query_map(request.uri())?;
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 authorization = if let Some(authorization) = headers.get("authorization") { if query.contains_key(X_AMZ_ALGORITHM.as_str()) {
parse_authorization(authorization, &headers)? // We check for presigned-URL-style authentification first, because
} else if let Some(algorithm) = headers.get("x-amz-algorithm") { // the browser or someting else could inject an Authorization header
parse_query_authorization(algorithm, &headers)? // 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 { } else {
let content_sha256 = headers.get("x-amz-content-sha256"); // Unsigned (anonymous) request
if let Some(content_sha256) = content_sha256.filter(|c| "UNSIGNED-PAYLOAD" != c.as_str()) { 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) let sha256 = hex::decode(content_sha256)
.ok() .ok()
.and_then(|bytes| Hash::try_from(&bytes)) .and_then(|bytes| Hash::try_from(&bytes))
.ok_or_bad_request("Invalid content sha256 hash")?; .ok_or_bad_request("Invalid content sha256 hash")?;
return Ok((None, Some(sha256))); Ok((None, Some(sha256)))
} else { } else {
return Ok((None, None)); Ok((None, None))
} }
}; }
}
async fn check_standard_signature(
garage: &Garage,
service: &'static str,
request: &Request<Body>,
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)?;
let canonical_request = canonical_request( let canonical_request = canonical_request(
service, service,
request.method(), request.method(),
request.uri(), request.uri().path(),
&headers, &query,
&authorization.signed_headers, request.headers(),
&signed_headers,
&authorization.content_sha256, &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!("canonical request:\n{}", canonical_request);
trace!("string to sign:\n{}", string_to_sign); trace!("string to sign:\n{}", string_to_sign);
let key = verify_v4( let key = verify_v4(garage, service, &authorization, string_to_sign.as_bytes()).await?;
garage,
service,
&authorization.credential,
&authorization.date,
&authorization.signature,
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 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")?; let bytes = hex::decode(authorization.signature).ok_or_bad_request("Invalid signature")?;
Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid signature")?) Some(Hash::try_from(&bytes).ok_or_bad_request("Invalid signature")?)
} else { } else {
@ -88,124 +115,96 @@ pub async fn check_payload_signature(
Ok((Some(key), content_sha256)) Ok((Some(key), content_sha256))
} }
struct Authorization { async fn check_presigned_signature(
credential: String, garage: &Garage,
signed_headers: String, service: &'static str,
signature: String, request: &mut Request<Body>,
content_sha256: String, mut query: QueryMap,
date: DateTime<Utc>, ) -> 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( pub fn parse_query_map(uri: &http::uri::Uri) -> Result<QueryMap, Error> {
authorization: &str, let mut query = QueryMap::new();
headers: &HashMap<String, String>, if let Some(query_str) = uri.query() {
) -> Result<Authorization, Error> { let query_pairs = url::form_urlencoded::parse(query_str.as_bytes());
let first_space = authorization for (key, val) in query_pairs {
.find(' ') if query.insert(key.to_string(), val.into_owned()).is_some() {
.ok_or_bad_request("Authorization field to short")?; return Err(Error::bad_request(format!(
let (auth_kind, rest) = authorization.split_at(first_space); "duplicate query parameter: `{}`",
key
if auth_kind != "AWS4-HMAC-SHA256" { )));
return Err(Error::bad_request("Unsupported authorization method")); }
}
} }
Ok(query)
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,
})
} }
fn parse_credential(cred: &str) -> Result<(String, String), Error> { fn parse_credential(cred: &str) -> Result<(String, String), Error> {
@ -219,11 +218,39 @@ 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]) -> 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-") {
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 { pub fn string_to_sign(datetime: &DateTime<Utc>, scope_string: &str, canonical_req: &str) -> String {
let mut hasher = Sha256::default(); let mut hasher = Sha256::default();
hasher.update(canonical_req.as_bytes()); hasher.update(canonical_req.as_bytes());
[ [
"AWS4-HMAC-SHA256", AWS4_HMAC_SHA256,
&datetime.format(LONG_DATETIME).to_string(), &datetime.format(LONG_DATETIME).to_string(),
scope_string, scope_string,
&hex::encode(hasher.finalize().as_slice()), &hex::encode(hasher.finalize().as_slice()),
@ -234,11 +261,12 @@ pub fn string_to_sign(datetime: &DateTime<Utc>, scope_string: &str, canonical_re
pub fn canonical_request( pub fn canonical_request(
service: &'static str, service: &'static str,
method: &Method, method: &Method,
uri: &hyper::Uri, canonical_uri: &str,
headers: &HashMap<String, String>, query: &QueryMap,
signed_headers: &str, headers: &HeaderMap,
signed_headers: &[HeaderName],
content_sha256: &str, content_sha256: &str,
) -> String { ) -> Result<String, Error> {
// There seems to be evidence that in AWSv4 signatures, the path component is url-encoded // 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: // 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 // -> https://docs.aws.amazon.com/rolesanywhere/latest/userguide/authentication-sign-process.html
@ -268,49 +296,46 @@ pub fn canonical_request(
// it mentions it in the comments (same link to the souce code as above). // 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 // 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. // would make non-normalized paths invalid K2V partition keys, and we don't want that.
let path: std::borrow::Cow<str> = if service != "s3" { let canonical_uri: std::borrow::Cow<str> = if service != "s3" {
uri_encode(uri.path(), false).into() uri_encode(canonical_uri, false).into()
} else { } 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 { // Canonical query string from passed HeaderMap
let signed_headers_vec = signed_headers.split(';').collect::<Vec<_>>(); let canonical_query_string = {
let mut items = headers let mut items = Vec::with_capacity(query.len());
.iter() for (key, value) in query.iter() {
.filter(|(key, _)| signed_headers_vec.contains(&key.as_str())) items.push(uri_encode(&key, true) + "=" + &uri_encode(&value, true));
.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<_>>();
items.sort(); items.sort();
items.join("&") 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> { pub fn parse_date(date: &str) -> Result<DateTime<Utc>, Error> {
@ -322,38 +347,202 @@ pub fn parse_date(date: &str) -> Result<DateTime<Utc>, Error> {
pub async fn verify_v4( pub async fn verify_v4(
garage: &Garage, garage: &Garage,
service: &str, service: &str,
credential: &str, auth: &Authorization,
date: &DateTime<Utc>,
signature: &str,
payload: &[u8], payload: &[u8],
) -> Result<Key, Error> { ) -> Result<Key, Error> {
let (key_id, scope) = parse_credential(credential)?; let scope_expected = compute_scope(&auth.date, &garage.config.s3_api.s3_region, service);
if auth.scope != scope_expected {
let scope_expected = compute_scope(date, &garage.config.s3_api.s3_region, service); return Err(Error::AuthorizationHeaderMalformed(auth.scope.to_string()));
if scope != scope_expected {
return Err(Error::AuthorizationHeaderMalformed(scope.to_string()));
} }
let key = garage let key = garage
.key_table .key_table
.get(&EmptyKey, &key_id) .get(&EmptyKey, &auth.key_id)
.await? .await?
.filter(|k| !k.state.is_deleted()) .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 key_p = key.params().unwrap();
let mut hmac = signing_hmac( let mut hmac = signing_hmac(
date, &auth.date,
&key_p.secret_key, &key_p.secret_key,
&garage.config.s3_api.s3_region, &garage.config.s3_api.s3_region,
service, service,
) )
.ok_or_internal_error("Unable to build signing HMAC")?; .ok_or_internal_error("Unable to build signing HMAC")?;
hmac.update(payload); hmac.update(payload);
let signature = hex::decode(&signature).map_err(|_| Error::forbidden("Invalid signature"))?; let signature =
hex::decode(&auth.signature).map_err(|_| Error::forbidden("Invalid signature"))?;
if hmac.verify_slice(&signature).is_err() { if hmac.verify_slice(&signature).is_err() {
return Err(Error::forbidden("Invalid signature")); return Err(Error::forbidden("Invalid signature"));
} }
Ok(key) 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)
}
}

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

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