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
|
use quick_xml::de::from_reader;
use std::sync::Arc;
use http::header::{
ACCESS_CONTROL_ALLOW_HEADERS, ACCESS_CONTROL_ALLOW_METHODS, ACCESS_CONTROL_ALLOW_ORIGIN,
ACCESS_CONTROL_EXPOSE_HEADERS, ACCESS_CONTROL_REQUEST_HEADERS, ACCESS_CONTROL_REQUEST_METHOD,
};
use hyper::{header::HeaderName, Body, Method, Request, Response, StatusCode};
use serde::{Deserialize, Serialize};
use crate::s3::error::*;
use crate::s3::xml::{to_xml_with_header, xmlns_tag, IntValue, Value};
use crate::signature::verify_signed_content;
use garage_model::bucket_table::{Bucket, CorsRule as GarageCorsRule};
use garage_model::garage::Garage;
use garage_util::data::*;
pub async fn handle_get_cors(bucket: &Bucket) -> Result<Response<Body>, Error> {
let param = bucket
.params()
.ok_or_internal_error("Bucket should not be deleted at this point")?;
if let Some(cors) = param.cors_config.get() {
let wc = CorsConfiguration {
xmlns: (),
cors_rules: cors
.iter()
.map(CorsRule::from_garage_cors_rule)
.collect::<Vec<_>>(),
};
let xml = to_xml_with_header(&wc)?;
Ok(Response::builder()
.status(StatusCode::OK)
.header(http::header::CONTENT_TYPE, "application/xml")
.body(Body::from(xml))?)
} else {
Ok(Response::builder()
.status(StatusCode::NO_CONTENT)
.body(Body::empty())?)
}
}
pub async fn handle_delete_cors(
garage: Arc<Garage>,
bucket_id: Uuid,
) -> Result<Response<Body>, Error> {
let mut bucket = garage
.bucket_helper()
.get_existing_bucket(bucket_id)
.await?;
let param = bucket.params_mut().unwrap();
param.cors_config.update(None);
garage.bucket_table.insert(&bucket).await?;
Ok(Response::builder()
.status(StatusCode::NO_CONTENT)
.body(Body::empty())?)
}
pub async fn handle_put_cors(
garage: Arc<Garage>,
bucket_id: Uuid,
req: Request<Body>,
content_sha256: Option<Hash>,
) -> Result<Response<Body>, Error> {
let body = hyper::body::to_bytes(req.into_body()).await?;
if let Some(content_sha256) = content_sha256 {
verify_signed_content(content_sha256, &body[..])?;
}
let mut bucket = garage
.bucket_helper()
.get_existing_bucket(bucket_id)
.await?;
let param = bucket.params_mut().unwrap();
let conf: CorsConfiguration = from_reader(&body as &[u8])?;
conf.validate()?;
param
.cors_config
.update(Some(conf.into_garage_cors_config()?));
garage.bucket_table.insert(&bucket).await?;
Ok(Response::builder()
.status(StatusCode::OK)
.body(Body::empty())?)
}
pub async fn handle_options_s3api(
garage: Arc<Garage>,
req: &Request<Body>,
bucket_name: Option<String>,
) -> Result<Response<Body>, Error> {
// FIXME: CORS rules of buckets with local aliases are
// not taken into account.
// If the bucket name is a global bucket name,
// we try to apply the CORS rules of that bucket.
// If a user has a local bucket name that has
// the same name, its CORS rules won't be applied
// and will be shadowed by the rules of the globally
// existing bucket (but this is inevitable because
// OPTIONS calls are not auhtenticated).
if let Some(bn) = bucket_name {
let helper = garage.bucket_helper();
let bucket_id = helper.resolve_global_bucket_name(&bn).await?;
if let Some(id) = bucket_id {
let bucket = garage.bucket_helper().get_existing_bucket(id).await?;
handle_options_for_bucket(req, &bucket)
} else {
// If there is a bucket name in the request, but that name
// does not correspond to a global alias for a bucket,
// then it's either a non-existing bucket or a local bucket.
// We have no way of knowing, because the request is not
// authenticated and thus we can't resolve local aliases.
// We take the permissive approach of allowing everything,
// because we don't want to prevent web apps that use
// local bucket names from making API calls.
Ok(Response::builder()
.header(ACCESS_CONTROL_ALLOW_ORIGIN, "*")
.header(ACCESS_CONTROL_ALLOW_METHODS, "*")
.status(StatusCode::OK)
.body(Body::empty())?)
}
} else {
// If there is no bucket name in the request,
// we are doing a ListBuckets call, which we want to allow
// for all origins.
Ok(Response::builder()
.header(ACCESS_CONTROL_ALLOW_ORIGIN, "*")
.header(ACCESS_CONTROL_ALLOW_METHODS, "GET")
.status(StatusCode::OK)
.body(Body::empty())?)
}
}
pub fn handle_options_for_bucket(
req: &Request<Body>,
bucket: &Bucket,
) -> Result<Response<Body>, Error> {
let origin = req
.headers()
.get("Origin")
.ok_or_bad_request("Missing Origin header")?
.to_str()?;
let request_method = req
.headers()
.get(ACCESS_CONTROL_REQUEST_METHOD)
.ok_or_bad_request("Missing Access-Control-Request-Method header")?
.to_str()?;
let request_headers = match req.headers().get(ACCESS_CONTROL_REQUEST_HEADERS) {
Some(h) => h.to_str()?.split(',').map(|h| h.trim()).collect::<Vec<_>>(),
None => vec![],
};
if let Some(cors_config) = bucket.params().unwrap().cors_config.get() {
let matching_rule = cors_config
.iter()
.find(|rule| cors_rule_matches(rule, origin, request_method, request_headers.iter()));
if let Some(rule) = matching_rule {
let mut resp = Response::builder()
.status(StatusCode::OK)
.body(Body::empty())?;
add_cors_headers(&mut resp, rule).ok_or_internal_error("Invalid CORS configuration")?;
return Ok(resp);
}
}
Err(Error::forbidden("This CORS request is not allowed."))
}
pub fn find_matching_cors_rule<'a>(
bucket: &'a Bucket,
req: &Request<Body>,
) -> Result<Option<&'a GarageCorsRule>, Error> {
if let Some(cors_config) = bucket.params().unwrap().cors_config.get() {
if let Some(origin) = req.headers().get("Origin") {
let origin = origin.to_str()?;
let request_headers = match req.headers().get(ACCESS_CONTROL_REQUEST_HEADERS) {
Some(h) => h.to_str()?.split(',').map(|h| h.trim()).collect::<Vec<_>>(),
None => vec![],
};
return Ok(cors_config.iter().find(|rule| {
cors_rule_matches(rule, origin, req.method().as_ref(), request_headers.iter())
}));
}
}
Ok(None)
}
fn cors_rule_matches<'a, HI, S>(
rule: &GarageCorsRule,
origin: &'a str,
method: &'a str,
mut request_headers: HI,
) -> bool
where
HI: Iterator<Item = S>,
S: AsRef<str>,
{
rule.allow_origins.iter().any(|x| x == "*" || x == origin)
&& rule.allow_methods.iter().any(|x| x == "*" || x == method)
&& request_headers.all(|h| {
rule.allow_headers
.iter()
.any(|x| x == "*" || x == h.as_ref())
})
}
pub fn add_cors_headers(
resp: &mut Response<Body>,
rule: &GarageCorsRule,
) -> Result<(), http::header::InvalidHeaderValue> {
let h = resp.headers_mut();
h.insert(
ACCESS_CONTROL_ALLOW_ORIGIN,
rule.allow_origins.join(", ").parse()?,
);
h.insert(
ACCESS_CONTROL_ALLOW_METHODS,
rule.allow_methods.join(", ").parse()?,
);
h.insert(
ACCESS_CONTROL_ALLOW_HEADERS,
rule.allow_headers.join(", ").parse()?,
);
h.insert(
ACCESS_CONTROL_EXPOSE_HEADERS,
rule.expose_headers.join(", ").parse()?,
);
Ok(())
}
// ---- SERIALIZATION AND DESERIALIZATION TO/FROM S3 XML ----
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
#[serde(rename = "CORSConfiguration")]
pub struct CorsConfiguration {
#[serde(serialize_with = "xmlns_tag", skip_deserializing)]
pub xmlns: (),
#[serde(rename = "CORSRule")]
pub cors_rules: Vec<CorsRule>,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct CorsRule {
#[serde(rename = "ID")]
pub id: Option<Value>,
#[serde(rename = "MaxAgeSeconds")]
pub max_age_seconds: Option<IntValue>,
#[serde(rename = "AllowedOrigin")]
pub allowed_origins: Vec<Value>,
#[serde(rename = "AllowedMethod")]
pub allowed_methods: Vec<Value>,
#[serde(rename = "AllowedHeader", default)]
pub allowed_headers: Vec<Value>,
#[serde(rename = "ExposeHeader", default)]
pub expose_headers: Vec<Value>,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct AllowedMethod {
#[serde(rename = "AllowedMethod")]
pub allowed_method: Value,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct AllowedHeader {
#[serde(rename = "AllowedHeader")]
pub allowed_header: Value,
}
#[derive(Debug, Serialize, Deserialize, PartialEq, Eq, PartialOrd, Ord)]
pub struct ExposeHeader {
#[serde(rename = "ExposeHeader")]
pub expose_header: Value,
}
impl CorsConfiguration {
pub fn validate(&self) -> Result<(), Error> {
for r in self.cors_rules.iter() {
r.validate()?;
}
Ok(())
}
pub fn into_garage_cors_config(self) -> Result<Vec<GarageCorsRule>, Error> {
Ok(self
.cors_rules
.iter()
.map(CorsRule::to_garage_cors_rule)
.collect())
}
}
impl CorsRule {
pub fn validate(&self) -> Result<(), Error> {
for method in self.allowed_methods.iter() {
method
.0
.parse::<Method>()
.ok_or_bad_request("Invalid CORSRule method")?;
}
for header in self
.allowed_headers
.iter()
.chain(self.expose_headers.iter())
{
header
.0
.parse::<HeaderName>()
.ok_or_bad_request("Invalid HTTP header name")?;
}
Ok(())
}
pub fn to_garage_cors_rule(&self) -> GarageCorsRule {
let convert_vec =
|vval: &[Value]| vval.iter().map(|x| x.0.to_owned()).collect::<Vec<String>>();
GarageCorsRule {
id: self.id.as_ref().map(|x| x.0.to_owned()),
max_age_seconds: self.max_age_seconds.as_ref().map(|x| x.0 as u64),
allow_origins: convert_vec(&self.allowed_origins),
allow_methods: convert_vec(&self.allowed_methods),
allow_headers: convert_vec(&self.allowed_headers),
expose_headers: convert_vec(&self.expose_headers),
}
}
pub fn from_garage_cors_rule(rule: &GarageCorsRule) -> Self {
let convert_vec = |vval: &[String]| {
vval.iter()
.map(|x| Value(x.clone()))
.collect::<Vec<Value>>()
};
Self {
id: rule.id.as_ref().map(|x| Value(x.clone())),
max_age_seconds: rule.max_age_seconds.map(|x| IntValue(x as i64)),
allowed_origins: convert_vec(&rule.allow_origins),
allowed_methods: convert_vec(&rule.allow_methods),
allowed_headers: convert_vec(&rule.allow_headers),
expose_headers: convert_vec(&rule.expose_headers),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use quick_xml::de::from_str;
#[test]
fn test_deserialize() -> Result<(), Error> {
let message = r#"<?xml version="1.0" encoding="UTF-8"?>
<CORSConfiguration xmlns="http://s3.amazonaws.com/doc/2006-03-01/">
<CORSRule>
<AllowedOrigin>http://www.example.com</AllowedOrigin>
<AllowedMethod>PUT</AllowedMethod>
<AllowedMethod>POST</AllowedMethod>
<AllowedMethod>DELETE</AllowedMethod>
<AllowedHeader>*</AllowedHeader>
</CORSRule>
<CORSRule>
<AllowedOrigin>*</AllowedOrigin>
<AllowedMethod>GET</AllowedMethod>
</CORSRule>
<CORSRule>
<ID>qsdfjklm</ID>
<MaxAgeSeconds>12345</MaxAgeSeconds>
<AllowedOrigin>https://perdu.com</AllowedOrigin>
<AllowedMethod>GET</AllowedMethod>
<AllowedMethod>DELETE</AllowedMethod>
<AllowedHeader>*</AllowedHeader>
<ExposeHeader>*</ExposeHeader>
</CORSRule>
</CORSConfiguration>"#;
let conf: CorsConfiguration = from_str(message).unwrap();
let ref_value = CorsConfiguration {
xmlns: (),
cors_rules: vec![
CorsRule {
id: None,
max_age_seconds: None,
allowed_origins: vec!["http://www.example.com".into()],
allowed_methods: vec!["PUT".into(), "POST".into(), "DELETE".into()],
allowed_headers: vec!["*".into()],
expose_headers: vec![],
},
CorsRule {
id: None,
max_age_seconds: None,
allowed_origins: vec!["*".into()],
allowed_methods: vec!["GET".into()],
allowed_headers: vec![],
expose_headers: vec![],
},
CorsRule {
id: Some("qsdfjklm".into()),
max_age_seconds: Some(IntValue(12345)),
allowed_origins: vec!["https://perdu.com".into()],
allowed_methods: vec!["GET".into(), "DELETE".into()],
allowed_headers: vec!["*".into()],
expose_headers: vec!["*".into()],
},
],
};
assert_eq! {
ref_value,
conf
};
let message2 = to_xml_with_header(&ref_value)?;
let cleanup = |c: &str| c.replace(char::is_whitespace, "");
assert_eq!(cleanup(message), cleanup(&message2));
Ok(())
}
}
|
