aboutsummaryrefslogtreecommitdiff
path: root/src/api/s3/post_object.rs
blob: e9732dc495848041e9a67afcad7f27ee3ff7e91e (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
use std::collections::HashMap;
use std::convert::{Infallible, TryInto};
use std::ops::RangeInclusive;
use std::sync::Arc;
use std::task::{Context, Poll};

use base64::prelude::*;
use bytes::Bytes;
use chrono::{DateTime, Duration, Utc};
use futures::{Stream, StreamExt, TryStreamExt};
use http_body_util::BodyStream;
use hyper::header::{self, HeaderMap, HeaderName, HeaderValue};
use hyper::{body::Incoming as IncomingBody, Request, Response, StatusCode};
use multer::{Constraints, Multipart, SizeLimit};
use serde::Deserialize;

use garage_model::garage::Garage;

use crate::helpers::*;
use crate::s3::api_server::ResBody;
use crate::s3::cors::*;
use crate::s3::error::*;
use crate::s3::put::{get_headers, save_stream};
use crate::s3::xml as s3_xml;
use crate::signature::payload::{parse_date, verify_v4};

pub async fn handle_post_object(
	garage: Arc<Garage>,
	req: Request<IncomingBody>,
	bucket_name: String,
) -> Result<Response<ResBody>, Error> {
	let boundary = req
		.headers()
		.get(header::CONTENT_TYPE)
		.and_then(|ct| ct.to_str().ok())
		.and_then(|ct| multer::parse_boundary(ct).ok())
		.ok_or_bad_request("Could not get multipart boundary")?;

	// 16k seems plenty for a header. 5G is the max size of a single part, so it seems reasonable
	// for a PostObject
	let constraints = Constraints::new().size_limit(
		SizeLimit::new()
			.per_field(16 * 1024)
			.for_field("file", 5 * 1024 * 1024 * 1024),
	);

	let (head, body) = req.into_parts();
	let body_stream = BodyStream::new(body)
		.map(|x| x.map(|f| f.into_data().unwrap())) //TODO remove unwrap
		.map_err(Error::from);
	let mut multipart = Multipart::with_constraints(body_stream, boundary, constraints);

	let mut params = HeaderMap::new();
	let field = loop {
		let field = if let Some(field) = multipart.next_field().await? {
			field
		} else {
			return Err(Error::bad_request("Request did not contain a file"));
		};
		let name: HeaderName = if let Some(Ok(name)) = field.name().map(TryInto::try_into) {
			name
		} else {
			continue;
		};
		if name == "file" {
			break field;
		}

		if let Ok(content) = HeaderValue::from_str(&field.text().await?) {
			match name.as_str() {
				"tag" => (/* tag need to be reencoded, but we don't support them yet anyway */),
				"acl" => {
					if params.insert("x-amz-acl", content).is_some() {
						return Err(Error::bad_request("Field 'acl' provided more than once"));
					}
				}
				_ => {
					if params.insert(&name, content).is_some() {
						return Err(Error::bad_request(format!(
							"Field '{}' provided more than once",
							name
						)));
					}
				}
			}
		}
	};

	// Current part is file. Do some checks before handling to PutObject code
	let key = params
		.get("key")
		.ok_or_bad_request("No key was provided")?
		.to_str()?;
	let credential = params
		.get("x-amz-credential")
		.ok_or_else(|| Error::forbidden("Garage does not support anonymous access yet"))?
		.to_str()?;
	let policy = params
		.get("policy")
		.ok_or_bad_request("No policy was provided")?
		.to_str()?;
	let signature = params
		.get("x-amz-signature")
		.ok_or_bad_request("No signature was provided")?
		.to_str()?;
	let date = params
		.get("x-amz-date")
		.ok_or_bad_request("No date was provided")?
		.to_str()?;

	let key = if key.contains("${filename}") {
		// if no filename is provided, don't replace. This matches the behavior of AWS.
		if let Some(filename) = field.file_name() {
			key.replace("${filename}", filename)
		} else {
			key.to_owned()
		}
	} else {
		key.to_owned()
	};

	let date = parse_date(date)?;
	let api_key = verify_v4(
		&garage,
		"s3",
		credential,
		&date,
		signature,
		policy.as_bytes(),
	)
	.await?;

	let bucket_id = garage
		.bucket_helper()
		.resolve_bucket(&bucket_name, &api_key)
		.await?;

	if !api_key.allow_write(&bucket_id) {
		return Err(Error::forbidden("Operation is not allowed for this key."));
	}

	let bucket = garage
		.bucket_helper()
		.get_existing_bucket(bucket_id)
		.await?;

	let decoded_policy = BASE64_STANDARD
		.decode(policy)
		.ok_or_bad_request("Invalid policy")?;
	let decoded_policy: Policy =
		serde_json::from_slice(&decoded_policy).ok_or_bad_request("Invalid policy")?;

	let expiration: DateTime<Utc> = DateTime::parse_from_rfc3339(&decoded_policy.expiration)
		.ok_or_bad_request("Invalid expiration date")?
		.into();
	if Utc::now() - expiration > Duration::zero() {
		return Err(Error::bad_request("Expiration date is in the past"));
	}

	let mut conditions = decoded_policy.into_conditions()?;

	for (param_key, value) in params.iter() {
		let mut param_key = param_key.to_string();
		param_key.make_ascii_lowercase();
		match param_key.as_str() {
			"policy" | "x-amz-signature" => (), // this is always accepted, as it's required to validate other fields
			"content-type" => {
				let conds = conditions.params.remove("content-type").ok_or_else(|| {
					Error::bad_request(format!("Key '{}' is not allowed in policy", param_key))
				})?;
				for cond in conds {
					let ok = match cond {
						Operation::Equal(s) => s.as_str() == value,
						Operation::StartsWith(s) => {
							value.to_str()?.split(',').all(|v| v.starts_with(&s))
						}
					};
					if !ok {
						return Err(Error::bad_request(format!(
							"Key '{}' has value not allowed in policy",
							param_key
						)));
					}
				}
			}
			"key" => {
				let conds = conditions.params.remove("key").ok_or_else(|| {
					Error::bad_request(format!("Key '{}' is not allowed in policy", param_key))
				})?;
				for cond in conds {
					let ok = match cond {
						Operation::Equal(s) => s == key,
						Operation::StartsWith(s) => key.starts_with(&s),
					};
					if !ok {
						return Err(Error::bad_request(format!(
							"Key '{}' has value not allowed in policy",
							param_key
						)));
					}
				}
			}
			_ => {
				if param_key.starts_with("x-ignore-") {
					// if a x-ignore is provided in policy, it's not removed here, so it will be
					// rejected as provided in policy but not in the request. As odd as it is, it's
					// how aws seems to behave.
					continue;
				}
				let conds = conditions.params.remove(&param_key).ok_or_else(|| {
					Error::bad_request(format!("Key '{}' is not allowed in policy", param_key))
				})?;
				for cond in conds {
					let ok = match cond {
						Operation::Equal(s) => s.as_str() == value,
						Operation::StartsWith(s) => value.to_str()?.starts_with(s.as_str()),
					};
					if !ok {
						return Err(Error::bad_request(format!(
							"Key '{}' has value not allowed in policy",
							param_key
						)));
					}
				}
			}
		}
	}

	if let Some((param_key, _)) = conditions.params.iter().next() {
		return Err(Error::bad_request(format!(
			"Key '{}' is required in policy, but no value was provided",
			param_key
		)));
	}

	let headers = get_headers(&params)?;

	let stream = field.map(|r| r.map_err(Into::into));
	let (_, md5) = save_stream(
		garage,
		headers,
		StreamLimiter::new(stream, conditions.content_length),
		&bucket,
		&key,
		None,
		None,
	)
	.await?;

	let etag = format!("\"{}\"", md5);

	let mut resp = if let Some(mut target) = params
		.get("success_action_redirect")
		.and_then(|h| h.to_str().ok())
		.and_then(|u| url::Url::parse(u).ok())
		.filter(|u| u.scheme() == "https" || u.scheme() == "http")
	{
		target
			.query_pairs_mut()
			.append_pair("bucket", &bucket_name)
			.append_pair("key", &key)
			.append_pair("etag", &etag);
		let target = target.to_string();
		Response::builder()
			.status(StatusCode::SEE_OTHER)
			.header(header::LOCATION, target.clone())
			.header(header::ETAG, etag)
			.body(string_body(target))?
	} else {
		let path = head
			.uri
			.path_and_query()
			.map(|paq| paq.path().to_string())
			.unwrap_or_else(|| "/".to_string());
		let authority = head
			.headers
			.get(header::HOST)
			.and_then(|h| h.to_str().ok())
			.unwrap_or_default();
		let proto = if !authority.is_empty() {
			"https://"
		} else {
			""
		};

		let url_key: String = form_urlencoded::byte_serialize(key.as_bytes())
			.flat_map(str::chars)
			.collect();
		let location = format!("{}{}{}{}", proto, authority, path, url_key);

		let action = params
			.get("success_action_status")
			.and_then(|h| h.to_str().ok())
			.unwrap_or("204");
		let builder = Response::builder()
			.header(header::LOCATION, location.clone())
			.header(header::ETAG, etag.clone());
		match action {
			"200" => builder.status(StatusCode::OK).body(empty_body())?,
			"201" => {
				let xml = s3_xml::PostObject {
					xmlns: (),
					location: s3_xml::Value(location),
					bucket: s3_xml::Value(bucket_name),
					key: s3_xml::Value(key),
					etag: s3_xml::Value(etag),
				};
				let body = s3_xml::to_xml_with_header(&xml)?;
				builder
					.status(StatusCode::CREATED)
					.body(string_body(body))?
			}
			_ => builder.status(StatusCode::NO_CONTENT).body(empty_body())?,
		}
	};

	let matching_cors_rule = find_matching_cors_rule(
		&bucket,
		&Request::from_parts(head, empty_body::<Infallible>()),
	)?;
	if let Some(rule) = matching_cors_rule {
		add_cors_headers(&mut resp, rule)
			.ok_or_internal_error("Invalid bucket CORS configuration")?;
	}

	Ok(resp)
}

#[derive(Deserialize)]
struct Policy {
	expiration: String,
	conditions: Vec<PolicyCondition>,
}

impl Policy {
	fn into_conditions(self) -> Result<Conditions, Error> {
		let mut params = HashMap::<_, Vec<_>>::new();

		let mut length = (0, u64::MAX);
		for condition in self.conditions {
			match condition {
				PolicyCondition::Equal(map) => {
					if map.len() != 1 {
						return Err(Error::bad_request("Invalid policy item"));
					}
					let (mut k, v) = map.into_iter().next().expect("Size could not be 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::bad_request("Invalid policy item"));
					}
					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::bad_request("Invalid policy item")),
					}
				}
				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::bad_request("Invalid policy item"));
					}
				}
			}
		}
		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::bad_request(
						"File size does not match policy",
					))));
				}
			}
			Poll::Ready(None) => {
				if !self.length.contains(&self.read) {
					return Poll::Ready(Some(Err(Error::bad_request(
						"File size does not match policy",
					))));
				}
			}
			_ => {}
		}
		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);
	}
}