seaweedfs/weed/s3api/s3api_auth.go
2020-02-09 14:30:02 -08:00

93 lines
2.5 KiB
Go

package s3api
import (
"net/http"
"strings"
)
// AWS Signature Version '4' constants.
const (
signV4Algorithm = "AWS4-HMAC-SHA256"
signV2Algorithm = "AWS"
iso8601Format = "20060102T150405Z"
yyyymmdd = "20060102"
)
// Verify if request has JWT.
func isRequestJWT(r *http.Request) bool {
return strings.HasPrefix(r.Header.Get("Authorization"), "Bearer")
}
// Verify if request has AWS Signature Version '4'.
func isRequestSignatureV4(r *http.Request) bool {
return strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm)
}
// Verify if request has AWS Signature Version '2'.
func isRequestSignatureV2(r *http.Request) bool {
return !strings.HasPrefix(r.Header.Get("Authorization"), signV4Algorithm) &&
strings.HasPrefix(r.Header.Get("Authorization"), signV2Algorithm)
}
// Verify if request has AWS PreSign Version '4'.
func isRequestPresignedSignatureV4(r *http.Request) bool {
_, ok := r.URL.Query()["X-Amz-Credential"]
return ok
}
// Verify request has AWS PreSign Version '2'.
func isRequestPresignedSignatureV2(r *http.Request) bool {
_, ok := r.URL.Query()["AWSAccessKeyId"]
return ok
}
// Verify if request has AWS Post policy Signature Version '4'.
func isRequestPostPolicySignatureV4(r *http.Request) bool {
return strings.Contains(r.Header.Get("Content-Type"), "multipart/form-data") &&
r.Method == http.MethodPost
}
// Verify if the request has AWS Streaming Signature Version '4'. This is only valid for 'PUT' operation.
func isRequestSignStreamingV4(r *http.Request) bool {
return r.Header.Get("x-amz-content-sha256") == streamingContentSHA256 &&
r.Method == http.MethodPut
}
// Authorization type.
type authType int
// List of all supported auth types.
const (
authTypeUnknown authType = iota
authTypeAnonymous
authTypePresigned
authTypePresignedV2
authTypePostPolicy
authTypeStreamingSigned
authTypeSigned
authTypeSignedV2
authTypeJWT
)
// Get request authentication type.
func getRequestAuthType(r *http.Request) authType {
if isRequestSignatureV2(r) {
return authTypeSignedV2
} else if isRequestPresignedSignatureV2(r) {
return authTypePresignedV2
} else if isRequestSignStreamingV4(r) {
return authTypeStreamingSigned
} else if isRequestSignatureV4(r) {
return authTypeSigned
} else if isRequestPresignedSignatureV4(r) {
return authTypePresigned
} else if isRequestJWT(r) {
return authTypeJWT
} else if isRequestPostPolicySignatureV4(r) {
return authTypePostPolicy
} else if _, ok := r.Header["Authorization"]; !ok {
return authTypeAnonymous
}
return authTypeUnknown
}