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fix: reject invalid r.Host headers (#14846)

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r.Host headers can come in unparsed that may contain
invalid hostnames, reject such requests as invalid.

This is a continuation fix from #14844
This commit is contained in:
Harshavardhana 2022-05-02 04:42:41 -07:00 committed by GitHub
parent cff1be0ae8
commit 2719f1efaa
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 26 additions and 2 deletions
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28
cmd/generic-handlers.go
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@ -18,6 +18,7 @@
package cmd
import (
"fmt"
"net"
"net/http"
"path"
@ -295,6 +296,15 @@ const (
dotComponent = "."
)
func hasBadHost(host string) error {
if globalIsCICD && strings.TrimSpace(host) == "" {
// under CI/CD test setups ignore empty hosts as invalid hosts
return nil
}
_, err := xnet.ParseHost(host)
return err
}
// Check if the incoming path has bad path components,
// such as ".." and "."
func hasBadPathComponent(path string) bool {
@ -313,7 +323,11 @@ func hasBadPathComponent(path string) bool {
// Check if client is sending a malicious request.
func hasMultipleAuth(r *http.Request) bool {
authTypeCount := 0
for _, hasValidAuth := range []func(*http.Request) bool{isRequestSignatureV2, isRequestPresignedSignatureV2, isRequestSignatureV4, isRequestPresignedSignatureV4, isRequestJWT, isRequestPostPolicySignatureV4} {
for _, hasValidAuth := range []func(*http.Request) bool{
isRequestSignatureV2, isRequestPresignedSignatureV2,
isRequestSignatureV4, isRequestPresignedSignatureV4,
isRequestJWT, isRequestPostPolicySignatureV4,
} {
if hasValidAuth(r) {
authTypeCount++
}
@ -325,6 +339,14 @@ func hasMultipleAuth(r *http.Request) bool {
// any malicious requests.
func setRequestValidityHandler(h http.Handler) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
if err := hasBadHost(r.Host); err != nil {
invalidReq := errorCodes.ToAPIErr(ErrInvalidRequest)
invalidReq.Description = fmt.Sprintf("%s (%s)", invalidReq.Description, err)
writeErrorResponse(r.Context(), w, invalidReq, r.URL)
atomic.AddUint64(&globalHTTPStats.rejectedRequestsInvalid, 1)
return
}
// Check for bad components in URL path.
if hasBadPathComponent(r.URL.Path) {
writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrInvalidResourceName), r.URL)
@ -342,7 +364,9 @@ func setRequestValidityHandler(h http.Handler) http.Handler {
}
}
if hasMultipleAuth(r) {
writeErrorResponse(r.Context(), w, errorCodes.ToAPIErr(ErrInvalidRequest), r.URL)
invalidReq := errorCodes.ToAPIErr(ErrInvalidRequest)
invalidReq.Description = fmt.Sprintf("%s (request has multiple authentication types, please use one)", invalidReq.Description)
writeErrorResponse(r.Context(), w, invalidReq, r.URL)
atomic.AddUint64(&globalHTTPStats.rejectedRequestsInvalid, 1)
return
}