507 lines
13 KiB
Rust
507 lines
13 KiB
Rust
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 base64::prelude::*;
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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::s3::error::*;
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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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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_name: 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("Could 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::bad_request("Request did not contain a file"));
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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::bad_request("Field 'acl' provided more than once"));
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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::bad_request(format!(
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"Field '{}' provided more than once",
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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(|| Error::forbidden("Garage does not support anonymous access yet"))?
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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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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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let bucket_id = garage
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.bucket_helper()
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.resolve_bucket(&bucket_name, &api_key)
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.await?;
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if !api_key.allow_write(&bucket_id) {
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return Err(Error::forbidden("Operation is not allowed for this key."));
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}
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let bucket = garage
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.bucket_helper()
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.get_existing_bucket(bucket_id)
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.await?;
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let decoded_policy = BASE64_STANDARD
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.decode(policy)
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.ok_or_bad_request("Invalid 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::bad_request("Expiration date is in the past"));
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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::bad_request(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::bad_request(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::bad_request(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::bad_request(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::bad_request(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::bad_request(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::bad_request(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,
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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_name)
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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_name),
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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::bad_request("Invalid policy item"));
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}
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let (mut k, v) = map.into_iter().next().expect("Size could not be verified");
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k.make_ascii_lowercase();
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params.entry(k).or_default().push(Operation::Equal(v));
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}
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PolicyCondition::OtherOp([cond, mut key, value]) => {
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if key.remove(0) != '$' {
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return Err(Error::bad_request("Invalid policy item"));
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}
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key.make_ascii_lowercase();
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match cond.as_str() {
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"eq" => {
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params.entry(key).or_default().push(Operation::Equal(value));
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}
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"starts-with" => {
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params
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.entry(key)
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.or_default()
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.push(Operation::StartsWith(value));
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}
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_ => return Err(Error::bad_request("Invalid policy item")),
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}
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}
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PolicyCondition::SizeRange(key, min, max) => {
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if key == "content-length-range" {
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length.0 = length.0.max(min);
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length.1 = length.1.min(max);
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} else {
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return Err(Error::bad_request("Invalid policy item"));
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}
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}
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}
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}
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Ok(Conditions {
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params,
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content_length: RangeInclusive::new(length.0, length.1),
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})
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}
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}
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/// A single condition from a policy
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#[derive(Debug, Deserialize)]
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#[serde(untagged)]
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enum PolicyCondition {
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// will contain a single key-value pair
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Equal(HashMap<String, String>),
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OtherOp([String; 3]),
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SizeRange(String, u64, u64),
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}
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#[derive(Debug)]
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struct Conditions {
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params: HashMap<String, Vec<Operation>>,
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content_length: RangeInclusive<u64>,
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}
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#[derive(Debug, PartialEq, Eq)]
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enum Operation {
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Equal(String),
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StartsWith(String),
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}
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struct StreamLimiter<T> {
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inner: T,
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length: RangeInclusive<u64>,
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read: u64,
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}
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impl<T> StreamLimiter<T> {
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fn new(stream: T, length: RangeInclusive<u64>) -> Self {
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StreamLimiter {
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inner: stream,
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length,
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read: 0,
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}
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}
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}
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impl<T> Stream for StreamLimiter<T>
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where
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T: Stream<Item = Result<Bytes, Error>> + Unpin,
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{
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type Item = Result<Bytes, Error>;
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fn poll_next(
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mut self: std::pin::Pin<&mut Self>,
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ctx: &mut Context<'_>,
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) -> Poll<Option<Self::Item>> {
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let res = std::pin::Pin::new(&mut self.inner).poll_next(ctx);
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match &res {
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Poll::Ready(Some(Ok(bytes))) => {
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self.read += bytes.len() as u64;
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// optimization to fail early when we know before the end it's too long
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if self.length.end() < &self.read {
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return Poll::Ready(Some(Err(Error::bad_request(
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"File size does not match policy",
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))));
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}
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}
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Poll::Ready(None) => {
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if !self.length.contains(&self.read) {
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return Poll::Ready(Some(Err(Error::bad_request(
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"File size does not match policy",
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))));
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}
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}
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_ => {}
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}
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res
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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fn test_policy_1() {
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let policy_json = br#"
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{ "expiration": "2007-12-01T12:00:00.000Z",
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"conditions": [
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{"acl": "public-read" },
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{"bucket": "johnsmith" },
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["starts-with", "$key", "user/eric/"]
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]
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}
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"#;
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let policy_2: Policy = serde_json::from_slice(&policy_json[..]).unwrap();
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let mut conditions = policy_2.into_conditions().unwrap();
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assert_eq!(
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conditions.params.remove(&"acl".to_string()),
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Some(vec![Operation::Equal("public-read".into())])
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);
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assert_eq!(
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conditions.params.remove(&"bucket".to_string()),
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Some(vec![Operation::Equal("johnsmith".into())])
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);
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assert_eq!(
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conditions.params.remove(&"key".to_string()),
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Some(vec![Operation::StartsWith("user/eric/".into())])
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);
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assert!(conditions.params.is_empty());
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assert_eq!(conditions.content_length, 0..=u64::MAX);
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}
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#[test]
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fn test_policy_2() {
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let policy_json = br#"
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{ "expiration": "2007-12-01T12:00:00.000Z",
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"conditions": [
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[ "eq", "$acl", "public-read" ],
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["starts-with", "$Content-Type", "image/"],
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["starts-with", "$success_action_redirect", ""],
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["content-length-range", 1048576, 10485760]
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]
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}
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"#;
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let policy_2: Policy = serde_json::from_slice(&policy_json[..]).unwrap();
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let mut conditions = policy_2.into_conditions().unwrap();
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assert_eq!(
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conditions.params.remove(&"acl".to_string()),
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Some(vec![Operation::Equal("public-read".into())])
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);
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assert_eq!(
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conditions.params.remove("content-type").unwrap(),
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vec![Operation::StartsWith("image/".into())]
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);
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assert_eq!(
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conditions
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.params
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.remove(&"success_action_redirect".to_string()),
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Some(vec![Operation::StartsWith("".into())])
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);
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assert!(conditions.params.is_empty());
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assert_eq!(conditions.content_length, 1048576..=10485760);
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}
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}
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