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fix: information disclosure bug in preconditions GET (#19810)

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precondition check was being honored before, validating
if anonymous access is allowed on the metadata of an
object, leading to metadata disclosure of the following
headers.

```
Last-Modified
Etag
x-amz-version-id
Expires:
Cache-Control:
```

although the information presented is minimal in nature,
and of opaque nature. It still simply discloses that an
object by a specific name exists or not without even having
enough permissions.
This commit is contained in:
Harshavardhana
2024-05-27 12:17:46 -07:00
committed by GitHub
parent 9d20dec56a
commit e0fe7cc391
19 changed files with 90 additions and 91 deletions
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18
cmd/object-handlers.go
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@@ -476,6 +476,15 @@ func (api objectAPIHandlers) getObjectHandler(ctx context.Context, objectAPI Obj
return true
}
if oi.UserTags != "" {
r.Header.Set(xhttp.AmzObjectTagging, oi.UserTags)
}
if s3Error := authorizeRequest(ctx, r, policy.GetObjectAction); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
return true
}
return checkPreconditions(ctx, w, r, oi, opts)
}
@@ -547,15 +556,6 @@ func (api objectAPIHandlers) getObjectHandler(ctx context.Context, objectAPI Obj
objInfo := gr.ObjInfo
if objInfo.UserTags != "" {
r.Header.Set(xhttp.AmzObjectTagging, objInfo.UserTags)
}
if s3Error := authorizeRequest(ctx, r, policy.GetObjectAction); s3Error != ErrNone {
writeErrorResponse(ctx, w, errorCodes.ToAPIErr(s3Error), r.URL)
return
}
if !proxy.Proxy { // apply lifecycle rules only for local requests
// Automatically remove the object/version if an expiry lifecycle rule can be applied
if lc, err := globalLifecycleSys.Get(bucket); err == nil {