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address review comments

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trinity-1686a 2022-02-16 23:27:30 +01:00
parent 93637d40ec
commit fe9210f071
1 changed files with 90 additions and 36 deletions
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126
src/api/s3_post_object.rs
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@ -108,6 +108,7 @@ pub async fn handle_post_object(
.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 {
@ -149,11 +150,14 @@ pub async fn handle_post_object(
match param_key.as_str() {
"policy" | "x-amz-signature" => (), // this is always accepted, as it's required to validate other fields
"content-type" => {
for cond in &conditions.content_type {
let conds = conditions.params.remove("content-type").ok_or_else(|| {
Error::BadRequest(format!("Key '{}' is not allowed in policy", param_key))
})?;
for cond in conds {
let ok = match cond {
Operation::Equal(s) => value == s,
Operation::Equal(s) => s.as_str() == value,
Operation::StartsWith(s) => {
value.to_str()?.split(',').all(|v| v.starts_with(s))
value.to_str()?.split(',').all(|v| v.starts_with(&s))
}
};
if !ok {
@ -182,6 +186,12 @@ pub async fn handle_post_object(
}
}
_ => {
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::BadRequest(format!("Key '{}' is not allowed in policy", param_key))
})?;
@ -208,15 +218,6 @@ pub async fn handle_post_object(
)));
}
let content_type = field
.content_type()
.map(AsRef::as_ref)
.map(HeaderValue::from_str)
.transpose()
.ok_or_bad_request("Invalid content type")?
.unwrap_or_else(|| HeaderValue::from_static("blob"));
params.append(header::CONTENT_TYPE, content_type);
let headers = get_headers(&params)?;
let stream = field.map(|r| r.map_err(Into::into));
@ -311,7 +312,6 @@ struct Policy {
impl Policy {
fn into_conditions(self) -> Result<Conditions, Error> {
let mut params = HashMap::<_, Vec<_>>::new();
let mut content_type = Vec::new();
let mut length = (0, u64::MAX);
for condition in self.conditions {
@ -322,11 +322,7 @@ impl Policy {
}
let (mut k, v) = map.into_iter().next().expect("size was verified");
k.make_ascii_lowercase();
if k == "content-type" {
content_type.push(Operation::Equal(v));
} else {
params.entry(k).or_default().push(Operation::Equal(v));
}
params.entry(k).or_default().push(Operation::Equal(v));
}
PolicyCondition::OtherOp([cond, mut key, value]) => {
if key.remove(0) != '$' {
@ -335,21 +331,13 @@ impl Policy {
key.make_ascii_lowercase();
match cond.as_str() {
"eq" => {
if key == "content-type" {
content_type.push(Operation::Equal(value));
} else {
params.entry(key).or_default().push(Operation::Equal(value));
}
params.entry(key).or_default().push(Operation::Equal(value));
}
"starts-with" => {
if key == "content-type" {
content_type.push(Operation::StartsWith(value));
} else {
params
.entry(key)
.or_default()
.push(Operation::StartsWith(value));
}
params
.entry(key)
.or_default()
.push(Operation::StartsWith(value));
}
_ => return Err(Error::BadRequest("Invalid policy item".to_owned())),
}
@ -366,14 +354,13 @@ impl Policy {
}
Ok(Conditions {
params,
content_type,
content_length: RangeInclusive::new(length.0, length.1),
})
}
}
/// A single condition from a policy
#[derive(Deserialize)]
#[derive(Debug, Deserialize)]
#[serde(untagged)]
enum PolicyCondition {
// will contain a single key-value pair
@ -382,14 +369,13 @@ enum PolicyCondition {
SizeRange(String, u64, u64),
}
#[derive(Debug)]
struct Conditions {
params: HashMap<String, Vec<Operation>>,
content_type: Vec<Operation>,
#[allow(dead_code)]
content_length: RangeInclusive<u64>,
}
#[derive(PartialEq, Eq)]
#[derive(Debug, PartialEq, Eq)]
enum Operation {
Equal(String),
StartsWith(String),
@ -443,3 +429,71 @@ where
res
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_policy_1() {
let policy_json = br#"
{ "expiration": "2007-12-01T12:00:00.000Z",
"conditions": [
{"acl": "public-read" },
{"bucket": "johnsmith" },
["starts-with", "$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);
}
}