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http.go
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http.go
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// Copyright 2023 Juan Pablo Tosso and the OWASP Coraza contributors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package coraza
import (
"fmt"
"io"
"net"
"net/http"
"strconv"
"strings"
"github.com/corazawaf/coraza/v3/types"
)
func processRequest(tx types.Transaction, r *http.Request) (*types.Interruption, error) {
// first we parse the r.RemoteAddr, it could be an IP or an IP:PORT or a [IP]:PORT
remoteAddr := r.RemoteAddr
remotePort := ""
if strings.Contains(remoteAddr, ":") {
remoteAddr, remotePort, _ = net.SplitHostPort(remoteAddr)
}
rPort, err := strconv.Atoi(remotePort)
if err != nil {
rPort = 0
}
tx.ProcessConnection(remoteAddr, rPort, "", 0)
tx.ProcessURI(r.URL.String(), r.Method, r.Proto)
for k, v := range r.Header {
tx.AddRequestHeader(k, v[0])
}
tx.AddRequestHeader("Host", r.Host)
if it := tx.ProcessRequestHeaders(); it != nil {
return it, nil
}
if r.Body != nil && r.Body != http.NoBody {
it, _, err := tx.ReadRequestBodyFrom(r.Body)
if err != nil {
return nil, fmt.Errorf("failed to append request body: %s", err.Error())
}
if it != nil {
return it, nil
}
rbr, err := tx.RequestBodyReader()
if err != nil {
return nil, fmt.Errorf("failed to get the request body: %s", err.Error())
}
body := io.MultiReader(rbr, r.Body)
// req.Body is transparently reinizialied with a new io.ReadCloser.
// The http handler will be able to read it.
// Prior to Go 1.19 NopCloser does not implement WriterTo if the reader implements it.
// - https://github.com/golang/go/issues/51566
// - https://tip.golang.org/doc/go1.19#minor_library_changes
// This avoid errors like "failed to process request: malformed chunked encoding" when
// using io.Copy.
// In Go 1.19 we just do `req.Body = io.NopCloser(reader)`
if rwt, ok := body.(io.WriterTo); ok {
r.Body = struct {
io.Reader
io.WriterTo
io.Closer
}{body, rwt, r.Body}
} else {
r.Body = struct {
io.Reader
io.Closer
}{body, r.Body}
}
}
return tx.ProcessRequestBody()
}