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Check error status codes (#14850)

Browse source 
If an invalid status code is generated from an error we risk panicking. Even if there 
are no potential problems at the moment we should prevent this in the future.

Add safeguards against this.

Sample trace:

```
May 02 06:41:39   minio[52806]: panic: "GET /20180401230655.PDF": invalid WriteHeader code 0
May 02 06:41:39   minio[52806]: goroutine 16040430822 [running]:
May 02 06:41:39   minio[52806]: runtime/debug.Stack(0xc01fff7c20, 0x25c4b00, 0xc0490e4080)
May 02 06:41:39   minio[52806]:         runtime/debug/stack.go:24 +0x9f
May 02 06:41:39   minio[52806]: github.com/minio/minio/cmd.setCriticalErrorHandler.func1.1(0xc022048800, 0x4f38ab0, 0xc0406e0fc0)
May 02 06:41:39   minio[52806]:         github.com/minio/minio/cmd/generic-handlers.go:469 +0x85
May 02 06:41:39   minio[52806]: panic(0x25c4b00, 0xc0490e4080)
May 02 06:41:39   minio[52806]:         runtime/panic.go:965 +0x1b9
May 02 06:41:39   minio[52806]: net/http.checkWriteHeaderCode(...)
May 02 06:41:39   minio[52806]:         net/http/server.go:1092
May 02 06:41:39   minio[52806]: net/http.(*response).WriteHeader(0xc0406e0fc0, 0x0)
May 02 06:41:39   minio[52806]:         net/http/server.go:1126 +0x718
May 02 06:41:39   minio[52806]: github.com/minio/minio/internal/logger.(*ResponseWriter).WriteHeader(0xc032fa3ea0, 0x0)
May 02 06:41:39   minio[52806]:         github.com/minio/minio/internal/logger/audit.go:116 +0xb1
May 02 06:41:39   minio[52806]: github.com/minio/minio/internal/logger.(*ResponseWriter).WriteHeader(0xc032fa3f40, 0x0)
May 02 06:41:39   minio[52806]:         github.com/minio/minio/internal/logger/audit.go:116 +0xb1
May 02 06:41:39   minio[52806]: github.com/minio/minio/internal/logger.(*ResponseWriter).WriteHeader(0xc002ce8000, 0x0)
May 02 06:41:39   minio[52806]:         github.com/minio/minio/internal/logger/audit.go:116 +0xb1
May 02 06:41:39   minio[52806]: github.com/minio/minio/cmd.writeResponse(0x4f364a0, 0xc002ce8000, 0x0, 0xc0443b86c0, 0x1cb, 0x224, 0x2a9651e, 0xf)
May 02 06:41:39   minio[52806]:         github.com/minio/minio/cmd/api-response.go:736 +0x18d
May 02 06:41:39   minio[52806]: github.com/minio/minio/cmd.writeErrorResponse(0x4f44218, 0xc069086ae0, 0x4f364a0, 0xc002ce8000, 0x0, 0x0, 0x0, 0x0, 0x0, 0xc00656afc0)
May 02 06:41:39   minio[52806]:         github.com/minio/minio/cmd/api-response.go:798 +0x306
May 02 06:41:39   minio[52806]: github.com/minio/minio/cmd.objectAPIHandlers.getObjectHandler(0x4b73768, 0x4b73730, 0x4f44218, 0xc069086ae0, 0x4f82090, 0xc002d80620, 0xc040e03885, 0xe, 0xc040e03894, 0x61, ...)
May 02 06:41:39   minio[52806]:         github.com/minio/minio/cmd/object-handlers.go:456 +0x252c
```
This commit is contained in:
Klaus Post 2022-05-02 10:36:29 -07:00 committed by GitHub
parent 16bc11e72e
commit 3e3ff2a70b
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 14 additions and 0 deletions
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14
cmd/api-response.go
View file

@ -728,6 +728,14 @@ func generateMultiDeleteResponse(quiet bool, deletedObjects []DeletedObject, err
}
func writeResponse(w http.ResponseWriter, statusCode int, response []byte, mType mimeType) {
if statusCode == 0 {
statusCode = 200
}
// Similar check to http.checkWriteHeaderCode
if statusCode < 100 || statusCode > 999 {
logger.Error(fmt.Sprintf("invalid WriteHeader code %v", statusCode))
statusCode = http.StatusInternalServerError
}
setCommonHeaders(w)
if mType != mimeNone {
w.Header().Set(xhttp.ContentType, string(mType))
@ -791,6 +799,12 @@ func writeErrorResponse(ctx context.Context, w http.ResponseWriter, err APIError
err.Description = fmt.Sprintf("The authorization header is malformed; the region is wrong; expecting '%s'.", globalSite.Region)
}
// Similar check to http.checkWriteHeaderCode
if err.HTTPStatusCode < 100 || err.HTTPStatusCode > 999 {
logger.Error(fmt.Sprintf("invalid WriteHeader code %v from %v", err.HTTPStatusCode, err.Code))
err.HTTPStatusCode = http.StatusInternalServerError
}
// Generate error response.
errorResponse := getAPIErrorResponse(ctx, err, reqURL.Path,
w.Header().Get(xhttp.AmzRequestID), globalDeploymentID)