[CWS] remove simpleHTTPRequest and use regular client (#32795)

(cherry picked from commit 3fa0ffd)

pkg/security/ptracer/container_context.go

@@ -9,6 +9,9 @@ package ptracer
 
 import (
 	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
 	"os"
 	"time"
 
@@ -23,9 +26,19 @@ type ECSMetadata struct {
 }
 
 func retrieveECSMetadata(url string) (*ECSMetadata, error) {
-	body, err := simpleHTTPRequest(url)
+	res, err := http.Get(url)
 	if err != nil {
-		return nil, err
+		return nil, fmt.Errorf("failed to get ECS metadata endpoint response: %w", err)
+	}
+
+	body, err := io.ReadAll(res.Body)
+	_ = res.Body.Close()
+	if err != nil {
+		return nil, fmt.Errorf("failed to read ECS metadata endpoint response: %w", err)
+	}
+
+	if res.StatusCode > 299 {
+		return nil, fmt.Errorf("ECS metadata endpoint returned an invalid http code: %d", res.StatusCode)
 	}
 
 	data := ECSMetadata{}

pkg/security/ptracer/utils.go

@@ -15,8 +15,6 @@ import (
 	"fmt"
 	"io"
 	"math/rand"
-	"net"
-	"net/url"
 	"os"
 	"path"
 	"path/filepath"
@@ -104,64 +102,6 @@ func getNSID() uint64 {
 	return stat.Ino
 }
 
-// simpleHTTPRequest used to avoid importing the crypto golang package
-func simpleHTTPRequest(uri string) ([]byte, error) {
-	u, err := url.Parse(uri)
-	if err != nil {
-		return nil, err
-	}
-
-	addr := u.Host
-	if u.Port() == "" {
-		addr += ":80"
-	}
-
-	tcpAddr, err := net.ResolveTCPAddr("tcp", addr)
-	if err != nil {
-		return nil, err
-	}
-
-	client, err := net.DialTCP("tcp", nil, tcpAddr)
-	if err != nil {
-		return nil, err
-	}
-	defer client.Close()
-
-	path := u.Path
-	if path == "" {
-		path = "/"
-	}
-
-	req := fmt.Sprintf("GET %s?%s HTTP/1.0\nHost: %s\nConnection: close\n\n", path, u.RawQuery, u.Hostname())
-
-	_, err = client.Write([]byte(req))
-	if err != nil {
-		return nil, err
-	}
-
-	var body []byte
-	buf := make([]byte, 256)
-
-	for {
-		n, err := client.Read(buf)
-		if err != nil {
-			if err != io.EOF {
-				return nil, err
-			}
-			break
-		}
-		body = append(body, buf[:n]...)
-	}
-
-	offset := bytes.Index(body, []byte{'\r', '\n', '\r', '\n'})
-	if offset < 0 {
-
-		return nil, errors.New("unable to parse http response")
-	}
-
-	return body[offset+2:], nil
-}
-
 func fillProcessCwd(process *Process) error {
 	cwd, err := os.Readlink(fmt.Sprintf("/proc/%d/cwd", process.Pid))
 	if err != nil {