2022-02-21 22:02:30 +00:00
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use std::collections::HashMap;
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use std::convert::TryInto;
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use std::ops::RangeInclusive;
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use std::sync::Arc;
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use std::task::{Context, Poll};
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use bytes::Bytes;
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use chrono::{DateTime, Duration, Utc};
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use futures::{Stream, StreamExt};
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use hyper::header::{self, HeaderMap, HeaderName, HeaderValue};
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use hyper::{Body, Request, Response, StatusCode};
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use multer::{Constraints, Multipart, SizeLimit};
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use serde::Deserialize;
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use garage_model::garage::Garage;
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use crate::error::*;
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2022-05-10 11:16:57 +00:00
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use crate::helpers::resolve_bucket;
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use crate::s3::put::{get_headers, save_stream};
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use crate::s3::xml as s3_xml;
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2022-02-21 22:02:30 +00:00
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use crate::signature::payload::{parse_date, verify_v4};
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pub async fn handle_post_object(
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garage: Arc<Garage>,
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req: Request<Body>,
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bucket: String,
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) -> Result<Response<Body>, Error> {
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let boundary = req
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.headers()
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.get(header::CONTENT_TYPE)
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.and_then(|ct| ct.to_str().ok())
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.and_then(|ct| multer::parse_boundary(ct).ok())
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.ok_or_bad_request("Counld not get multipart boundary")?;
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// 16k seems plenty for a header. 5G is the max size of a single part, so it seems reasonable
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// for a PostObject
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let constraints = Constraints::new().size_limit(
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SizeLimit::new()
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.per_field(16 * 1024)
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.for_field("file", 5 * 1024 * 1024 * 1024),
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);
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let (head, body) = req.into_parts();
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let mut multipart = Multipart::with_constraints(body, boundary, constraints);
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let mut params = HeaderMap::new();
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let field = loop {
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let field = if let Some(field) = multipart.next_field().await? {
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field
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} else {
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return Err(Error::BadRequest(
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"Request did not contain a file".to_owned(),
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));
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};
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let name: HeaderName = if let Some(Ok(name)) = field.name().map(TryInto::try_into) {
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name
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} else {
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continue;
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};
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if name == "file" {
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break field;
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}
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if let Ok(content) = HeaderValue::from_str(&field.text().await?) {
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match name.as_str() {
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"tag" => (/* tag need to be reencoded, but we don't support them yet anyway */),
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"acl" => {
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if params.insert("x-amz-acl", content).is_some() {
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return Err(Error::BadRequest(
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"Field 'acl' provided more than one time".to_string(),
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));
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}
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}
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_ => {
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if params.insert(&name, content).is_some() {
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return Err(Error::BadRequest(format!(
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"Field '{}' provided more than one time",
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name
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)));
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}
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}
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}
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}
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};
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// Current part is file. Do some checks before handling to PutObject code
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let key = params
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.get("key")
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.ok_or_bad_request("No key was provided")?
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.to_str()?;
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let credential = params
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.get("x-amz-credential")
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.ok_or_else(|| {
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Error::Forbidden("Garage does not support anonymous access yet".to_string())
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})?
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.to_str()?;
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let policy = params
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.get("policy")
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.ok_or_bad_request("No policy was provided")?
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.to_str()?;
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let signature = params
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.get("x-amz-signature")
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.ok_or_bad_request("No signature was provided")?
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.to_str()?;
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let date = params
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.get("x-amz-date")
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.ok_or_bad_request("No date was provided")?
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.to_str()?;
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let key = if key.contains("${filename}") {
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// if no filename is provided, don't replace. This matches the behavior of AWS.
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if let Some(filename) = field.file_name() {
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key.replace("${filename}", filename)
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} else {
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key.to_owned()
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}
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} else {
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key.to_owned()
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};
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let date = parse_date(date)?;
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2022-05-10 11:16:57 +00:00
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let api_key = verify_v4(
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&garage,
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"s3",
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credential,
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&date,
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signature,
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policy.as_bytes(),
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)
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.await?;
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2022-02-21 22:02:30 +00:00
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let bucket_id = resolve_bucket(&garage, &bucket, &api_key).await?;
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if !api_key.allow_write(&bucket_id) {
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return Err(Error::Forbidden(
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"Operation is not allowed for this key.".to_string(),
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));
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}
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let decoded_policy = base64::decode(&policy)?;
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let decoded_policy: Policy =
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serde_json::from_slice(&decoded_policy).ok_or_bad_request("Invalid policy")?;
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let expiration: DateTime<Utc> = DateTime::parse_from_rfc3339(&decoded_policy.expiration)
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.ok_or_bad_request("Invalid expiration date")?
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.into();
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if Utc::now() - expiration > Duration::zero() {
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return Err(Error::BadRequest(
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"Expiration date is in the paste".to_string(),
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));
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}
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let mut conditions = decoded_policy.into_conditions()?;
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for (param_key, value) in params.iter() {
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let mut param_key = param_key.to_string();
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param_key.make_ascii_lowercase();
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match param_key.as_str() {
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"policy" | "x-amz-signature" => (), // this is always accepted, as it's required to validate other fields
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"content-type" => {
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let conds = conditions.params.remove("content-type").ok_or_else(|| {
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Error::BadRequest(format!("Key '{}' is not allowed in policy", param_key))
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})?;
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for cond in conds {
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let ok = match cond {
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Operation::Equal(s) => s.as_str() == value,
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Operation::StartsWith(s) => {
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value.to_str()?.split(',').all(|v| v.starts_with(&s))
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}
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};
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if !ok {
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return Err(Error::BadRequest(format!(
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"Key '{}' has value not allowed in policy",
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param_key
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)));
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}
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}
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}
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"key" => {
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let conds = conditions.params.remove("key").ok_or_else(|| {
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Error::BadRequest(format!("Key '{}' is not allowed in policy", param_key))
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})?;
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for cond in conds {
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let ok = match cond {
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Operation::Equal(s) => s == key,
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Operation::StartsWith(s) => key.starts_with(&s),
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};
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if !ok {
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return Err(Error::BadRequest(format!(
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"Key '{}' has value not allowed in policy",
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param_key
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)));
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}
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}
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}
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_ => {
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if param_key.starts_with("x-ignore-") {
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// if a x-ignore is provided in policy, it's not removed here, so it will be
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// rejected as provided in policy but not in the request. As odd as it is, it's
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// how aws seems to behave.
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continue;
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}
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let conds = conditions.params.remove(¶m_key).ok_or_else(|| {
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Error::BadRequest(format!("Key '{}' is not allowed in policy", param_key))
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})?;
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for cond in conds {
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let ok = match cond {
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Operation::Equal(s) => s.as_str() == value,
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Operation::StartsWith(s) => value.to_str()?.starts_with(s.as_str()),
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};
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if !ok {
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return Err(Error::BadRequest(format!(
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"Key '{}' has value not allowed in policy",
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param_key
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)));
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}
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}
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}
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}
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}
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if let Some((param_key, _)) = conditions.params.iter().next() {
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return Err(Error::BadRequest(format!(
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"Key '{}' is required in policy, but no value was provided",
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param_key
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)));
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}
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let headers = get_headers(¶ms)?;
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let stream = field.map(|r| r.map_err(Into::into));
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let (_, md5) = save_stream(
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garage,
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headers,
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StreamLimiter::new(stream, conditions.content_length),
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bucket_id,
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&key,
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None,
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None,
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)
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.await?;
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let etag = format!("\"{}\"", md5);
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let resp = if let Some(mut target) = params
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.get("success_action_redirect")
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.and_then(|h| h.to_str().ok())
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.and_then(|u| url::Url::parse(u).ok())
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.filter(|u| u.scheme() == "https" || u.scheme() == "http")
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{
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target
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.query_pairs_mut()
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.append_pair("bucket", &bucket)
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.append_pair("key", &key)
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.append_pair("etag", &etag);
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let target = target.to_string();
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Response::builder()
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.status(StatusCode::SEE_OTHER)
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.header(header::LOCATION, target.clone())
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.header(header::ETAG, etag)
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.body(target.into())?
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} else {
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let path = head
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.uri
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.into_parts()
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.path_and_query
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.map(|paq| paq.path().to_string())
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.unwrap_or_else(|| "/".to_string());
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let authority = head
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.headers
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.get(header::HOST)
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.and_then(|h| h.to_str().ok())
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.unwrap_or_default();
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let proto = if !authority.is_empty() {
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"https://"
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} else {
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""
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};
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let url_key: String = form_urlencoded::byte_serialize(key.as_bytes())
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.flat_map(str::chars)
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.collect();
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let location = format!("{}{}{}{}", proto, authority, path, url_key);
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let action = params
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.get("success_action_status")
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.and_then(|h| h.to_str().ok())
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.unwrap_or("204");
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let builder = Response::builder()
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.header(header::LOCATION, location.clone())
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.header(header::ETAG, etag.clone());
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match action {
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"200" => builder.status(StatusCode::OK).body(Body::empty())?,
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"201" => {
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let xml = s3_xml::PostObject {
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xmlns: (),
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location: s3_xml::Value(location),
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bucket: s3_xml::Value(bucket),
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key: s3_xml::Value(key),
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etag: s3_xml::Value(etag),
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};
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let body = s3_xml::to_xml_with_header(&xml)?;
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builder
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.status(StatusCode::CREATED)
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.body(Body::from(body.into_bytes()))?
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}
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_ => builder.status(StatusCode::NO_CONTENT).body(Body::empty())?,
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}
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};
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Ok(resp)
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}
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#[derive(Deserialize)]
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struct Policy {
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expiration: String,
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conditions: Vec<PolicyCondition>,
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}
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impl Policy {
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fn into_conditions(self) -> Result<Conditions, Error> {
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let mut params = HashMap::<_, Vec<_>>::new();
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let mut length = (0, u64::MAX);
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for condition in self.conditions {
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match condition {
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PolicyCondition::Equal(map) => {
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if map.len() != 1 {
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return Err(Error::BadRequest("Invalid policy item".to_owned()));
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|
}
|
|
|
|
|
let (mut k, v) = map.into_iter().next().expect("size was verified");
|
|
|
|
|
k.make_ascii_lowercase();
|
|
|
|
|
params.entry(k).or_default().push(Operation::Equal(v));
|
|
|
|
|
}
|
|
|
|
|
PolicyCondition::OtherOp([cond, mut key, value]) => {
|
|
|
|
|
if key.remove(0) != '$' {
|
|
|
|
|
return Err(Error::BadRequest("Invalid policy item".to_owned()));
|
|
|
|
|
}
|
|
|
|
|
key.make_ascii_lowercase();
|
|
|
|
|
match cond.as_str() {
|
|
|
|
|
"eq" => {
|
|
|
|
|
params.entry(key).or_default().push(Operation::Equal(value));
|
|
|
|
|
}
|
|
|
|
|
"starts-with" => {
|
|
|
|
|
params
|
|
|
|
|
.entry(key)
|
|
|
|
|
.or_default()
|
|
|
|
|
.push(Operation::StartsWith(value));
|
|
|
|
|
}
|
|
|
|
|
_ => return Err(Error::BadRequest("Invalid policy item".to_owned())),
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
PolicyCondition::SizeRange(key, min, max) => {
|
|
|
|
|
if key == "content-length-range" {
|
|
|
|
|
length.0 = length.0.max(min);
|
|
|
|
|
length.1 = length.1.min(max);
|
|
|
|
|
} else {
|
|
|
|
|
return Err(Error::BadRequest("Invalid policy item".to_owned()));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
Ok(Conditions {
|
|
|
|
|
params,
|
|
|
|
|
content_length: RangeInclusive::new(length.0, length.1),
|
|
|
|
|
})
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/// A single condition from a policy
|
|
|
|
|
#[derive(Debug, Deserialize)]
|
|
|
|
|
#[serde(untagged)]
|
|
|
|
|
enum PolicyCondition {
|
|
|
|
|
// will contain a single key-value pair
|
|
|
|
|
Equal(HashMap<String, String>),
|
|
|
|
|
OtherOp([String; 3]),
|
|
|
|
|
SizeRange(String, u64, u64),
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[derive(Debug)]
|
|
|
|
|
struct Conditions {
|
|
|
|
|
params: HashMap<String, Vec<Operation>>,
|
|
|
|
|
content_length: RangeInclusive<u64>,
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[derive(Debug, PartialEq, Eq)]
|
|
|
|
|
enum Operation {
|
|
|
|
|
Equal(String),
|
|
|
|
|
StartsWith(String),
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
struct StreamLimiter<T> {
|
|
|
|
|
inner: T,
|
|
|
|
|
length: RangeInclusive<u64>,
|
|
|
|
|
read: u64,
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl<T> StreamLimiter<T> {
|
|
|
|
|
fn new(stream: T, length: RangeInclusive<u64>) -> Self {
|
|
|
|
|
StreamLimiter {
|
|
|
|
|
inner: stream,
|
|
|
|
|
length,
|
|
|
|
|
read: 0,
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
impl<T> Stream for StreamLimiter<T>
|
|
|
|
|
where
|
|
|
|
|
T: Stream<Item = Result<Bytes, Error>> + Unpin,
|
|
|
|
|
{
|
|
|
|
|
type Item = Result<Bytes, Error>;
|
|
|
|
|
fn poll_next(
|
|
|
|
|
mut self: std::pin::Pin<&mut Self>,
|
|
|
|
|
ctx: &mut Context<'_>,
|
|
|
|
|
) -> Poll<Option<Self::Item>> {
|
|
|
|
|
let res = std::pin::Pin::new(&mut self.inner).poll_next(ctx);
|
|
|
|
|
match &res {
|
|
|
|
|
Poll::Ready(Some(Ok(bytes))) => {
|
|
|
|
|
self.read += bytes.len() as u64;
|
|
|
|
|
// optimization to fail early when we know before the end it's too long
|
|
|
|
|
if self.length.end() < &self.read {
|
|
|
|
|
return Poll::Ready(Some(Err(Error::BadRequest(
|
|
|
|
|
"File size does not match policy".to_owned(),
|
|
|
|
|
))));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
Poll::Ready(None) => {
|
|
|
|
|
if !self.length.contains(&self.read) {
|
|
|
|
|
return Poll::Ready(Some(Err(Error::BadRequest(
|
|
|
|
|
"File size does not match policy".to_owned(),
|
|
|
|
|
))));
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
_ => {}
|
|
|
|
|
}
|
|
|
|
|
res
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[cfg(test)]
|
|
|
|
|
mod tests {
|
|
|
|
|
use super::*;
|
|
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
|
fn test_policy_1() {
|
|
|
|
|
let policy_json = br#"
|
|
|
|
|
{ "expiration": "2007-12-01T12:00:00.000Z",
|
|
|
|
|
"conditions": [
|
|
|
|
|
{"acl": "public-read" },
|
|
|
|
|
{"bucket": "johnsmith" },
|
|
|
|
|
["starts-with", "$key", "user/eric/"]
|
|
|
|
|
]
|
|
|
|
|
}
|
|
|
|
|
"#;
|
|
|
|
|
let policy_2: Policy = serde_json::from_slice(&policy_json[..]).unwrap();
|
|
|
|
|
let mut conditions = policy_2.into_conditions().unwrap();
|
|
|
|
|
|
|
|
|
|
assert_eq!(
|
|
|
|
|
conditions.params.remove(&"acl".to_string()),
|
|
|
|
|
Some(vec![Operation::Equal("public-read".into())])
|
|
|
|
|
);
|
|
|
|
|
assert_eq!(
|
|
|
|
|
conditions.params.remove(&"bucket".to_string()),
|
|
|
|
|
Some(vec![Operation::Equal("johnsmith".into())])
|
|
|
|
|
);
|
|
|
|
|
assert_eq!(
|
|
|
|
|
conditions.params.remove(&"key".to_string()),
|
|
|
|
|
Some(vec![Operation::StartsWith("user/eric/".into())])
|
|
|
|
|
);
|
|
|
|
|
assert!(conditions.params.is_empty());
|
|
|
|
|
assert_eq!(conditions.content_length, 0..=u64::MAX);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#[test]
|
|
|
|
|
fn test_policy_2() {
|
|
|
|
|
let policy_json = br#"
|
|
|
|
|
{ "expiration": "2007-12-01T12:00:00.000Z",
|
|
|
|
|
"conditions": [
|
|
|
|
|
[ "eq", "$acl", "public-read" ],
|
|
|
|
|
["starts-with", "$Content-Type", "image/"],
|
|
|
|
|
["starts-with", "$success_action_redirect", ""],
|
|
|
|
|
["content-length-range", 1048576, 10485760]
|
|
|
|
|
]
|
|
|
|
|
}
|
|
|
|
|
"#;
|
|
|
|
|
let policy_2: Policy = serde_json::from_slice(&policy_json[..]).unwrap();
|
|
|
|
|
let mut conditions = policy_2.into_conditions().unwrap();
|
|
|
|
|
|
|
|
|
|
assert_eq!(
|
|
|
|
|
conditions.params.remove(&"acl".to_string()),
|
|
|
|
|
Some(vec![Operation::Equal("public-read".into())])
|
|
|
|
|
);
|
|
|
|
|
assert_eq!(
|
|
|
|
|
conditions.params.remove("content-type").unwrap(),
|
|
|
|
|
vec![Operation::StartsWith("image/".into())]
|
|
|
|
|
);
|
|
|
|
|
assert_eq!(
|
|
|
|
|
conditions
|
|
|
|
|
.params
|
|
|
|
|
.remove(&"success_action_redirect".to_string()),
|
|
|
|
|
Some(vec![Operation::StartsWith("".into())])
|
|
|
|
|
);
|
|
|
|
|
assert!(conditions.params.is_empty());
|
|
|
|
|
assert_eq!(conditions.content_length, 1048576..=10485760);
|
|
|
|
|
}
|
|
|
|
|
}
|
