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Update error codes for sysmon DNS (elastic#16040)
This generates a list of error numbers / symbolic names from winerror.h. I included errors that began with "DNS_" and some additional error codes as reported in elastic#15685. Fixes elastic#15685 (cherry picked from commit 8f5d755)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,137 @@ | ||
| // Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one | ||
| // or more contributor license agreements. Licensed under the Elastic License; | ||
| // you may not use this file except in compliance with the Elastic License. | ||
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| //+build ignore | ||
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| package main | ||
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| import ( | ||
| "bytes" | ||
| "crypto/sha256" | ||
| "encoding/csv" | ||
| "encoding/hex" | ||
| "fmt" | ||
| "io" | ||
| "log" | ||
| "net/http" | ||
| "os" | ||
| "os/exec" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
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| // This file is used to generate the error code number to symbolic name mapping | ||
| // used in the Sysmon DNS event pipeline. It uses the Microsoft Error Lookup | ||
| // Tool to export the errors from winerror.h to CSV that extracts all of the | ||
| // error names that begin with "DNS_". It dumps the data to stdout and it can | ||
| // then be pasted in to the module. | ||
| // | ||
| // See https://docs.microsoft.com/en-us/windows/win32/debug/system-error-code-lookup-tool | ||
| // for details about the Microsoft Error Lookup Tool. | ||
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| const microsoftErrorToolURL = "https://download.microsoft.com/download/4/3/2/432140e8-fb6c-4145-8192-25242838c542/Err_6.4.5/Err_6.4.5.exe" | ||
| const microsoftErrorToolSha256 = "88739EC82BA16A0B4A3C83C1DD2FCA6336AD8E2A1E5F1238C085B1E86AB8834A" | ||
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| var includeCodes = []uint64{ | ||
| 5, | ||
| 8, | ||
| 13, | ||
| 14, | ||
| 123, | ||
| 1214, | ||
| 1223, | ||
| 1460, | ||
| 4312, | ||
| 9560, | ||
| 10054, | ||
| 10055, | ||
| 10060, | ||
| } | ||
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| func main() { | ||
| hash, err := downloadErrorLookupTool() | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| if hash != microsoftErrorToolSha256 { | ||
| log.Fatalf("bad sha256 for exe file: expected=%s, got=%s", microsoftErrorToolSha256, hash) | ||
| } | ||
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| r, err := exportErrors() | ||
| if err != nil { | ||
| log.Fatal(err) | ||
| } | ||
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| if err := parseCSV(r); err != nil { | ||
| log.Fatal(err) | ||
| } | ||
| } | ||
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| // download MS Error Lookup tool. | ||
| func downloadErrorLookupTool() (string, error) { | ||
| resp, err := http.Get("https://download.microsoft.com/download/4/3/2/432140e8-fb6c-4145-8192-25242838c542/Err_6.4.5/Err_6.4.5.exe") | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer resp.Body.Close() | ||
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| f, err := os.Create("Err.exe") | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| defer f.Close() | ||
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| sha256Hash := sha256.New() | ||
| body := io.TeeReader(resp.Body, sha256Hash) | ||
| _, err = io.Copy(f, body) | ||
| return strings.ToUpper(hex.EncodeToString(sha256Hash.Sum(nil))), err | ||
| } | ||
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| // exportErrors to CSV by executing Err.exe. | ||
| func exportErrors() (io.Reader, error) { | ||
| csvOutput := new(bytes.Buffer) | ||
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| cmd := exec.Command("Err.exe", "/winerror.h", "/:outputtoCSV") | ||
| cmd.Stdout = csvOutput | ||
| cmd.Stderr = os.Stderr | ||
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| return csvOutput, cmd.Run() | ||
| } | ||
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| // parseCSV parses the CSV and outputs the error codes that begin with "DNS_". | ||
| func parseCSV(r io.Reader) error { | ||
| codes := map[uint64]struct{}{} | ||
| for _, ec := range includeCodes { | ||
| codes[ec] = struct{}{} | ||
| } | ||
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| csvReader := csv.NewReader(r) | ||
| for { | ||
| fields, err := csvReader.Read() | ||
| if err != nil { | ||
| if err == io.EOF { | ||
| return nil | ||
| } | ||
| return err | ||
| } | ||
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| if len(fields) != 4 { | ||
| return fmt.Errorf("parse error") | ||
| } | ||
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| symbolicName := fields[1] | ||
| errorNumber, err := strconv.ParseUint(fields[0], 0, 64) | ||
| if err != nil { | ||
| log.Printf("Ignoring line because %v: %v", err, strings.Join(fields, ",")) | ||
| continue | ||
| } | ||
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| _, isIncludedCode := codes[errorNumber] | ||
| if isIncludedCode || strings.HasPrefix(symbolicName, "DNS_") { | ||
| fmt.Printf(`"%d": "%s",`+"\n", errorNumber, symbolicName) | ||
| } | ||
| } | ||
| return nil | ||
| } |