Resolve event name

libbsm.go

@@ -23,16 +23,20 @@ import (
 	"os"
 	"fmt"
 	"time"
+	"bufio"
 	"bytes"
+	"strings"
 	"strconv"
 	"encoding/binary"
 )
 
 const (
     // bsm/libbsm.h
-    AUDIT_MAX_ARGS =    128
+    AUDIT_MAX_ARGS =    	128
+	AUDIT_EVENT_FILE =		"/etc/security/audit_event"
+
     // sys/bsm/audit.h
-    MAXAUDITDATA =      (0x8000 - 1)
+    MAXAUDITDATA =			(0x8000 - 1)
     MAX_AUDIT_RECORD_SIZE = MAXAUDITDATA
 
 	// Max length for a Path (AUT_PATH) or an arg (AUT_EXEC_ARGS)
@@ -119,8 +123,19 @@ var (
 	gUsers		[]user
 	// A global group/gid cache
 	gGroups		[]group
+	// Cache of audit_event file
+	gEventDB	[]event
 )
 
+
+type event struct {
+	Type	int
+	Name	string
+	Desc	string
+	Class	string
+}
+
+
 // Fields types, from https://github.com/freebsd/freebsd-src/blob/main/contrib/openbsm/bsm/libbsm.h
 
 // Abstraction of a record
@@ -394,6 +409,45 @@ func getGroupNameByGid(gid uint32) (group, error) {
     return grp, nil
 }
 
+func getEventName(event uint16) (string,error) {
+	if len(gEventDB) == 0 {
+		loadEventDB()
+	}
+	for _, ev := range gEventDB {
+		if ev.Type == int(event) {
+			return ev.Desc, nil
+		}
+	}
+	return "", fmt.Errorf("Event ID not found: %x\n", event)
+}
+
+// We load the entire file in memory
+func loadEventDB() error {
+	file, err := os.Open(AUDIT_EVENT_FILE)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	fileScan := bufio.NewScanner(file)
+	fileScan.Split(bufio.ScanLines)
+	for fileScan.Scan() {
+		line := fileScan.Text()
+		if strings.HasPrefix(line, "#") {
+			continue
+		}
+		eventStr := strings.Split(line, ":")
+		if len(eventStr) != 4 {
+			continue
+		}
+		t, _ := strconv.Atoi(eventStr[0])
+		gEventDB = append(gEventDB, event{Type: t,
+										Name: eventStr[1],
+										Desc: eventStr[2],
+										Class: eventStr[3],})
+	}
+	return nil
+}
 
 func PrintIpv4FromInt(ipv4int uint32) string {
 	return fmt.Sprintf("%d.%d.%d.%d", ipv4int & 0xFF000000 >> 24, ipv4int & 0x00FF0000 >> 16,
@@ -460,8 +514,11 @@ func (h *Header32) LoadFromBinary(file *os.File) error {
 */
 func (h *Header32) Print(file *os.File, delimiter string, flags int) {
 	t := time.Unix((int64)(h.S), 0)
-	fmt.Fprintf(file, "header%s%v%s%v%s%v%s%v%s%v%s%v", delimiter, h.Size, delimiter, h.Version, delimiter,
+	// We dont care for error
-				h.E_type, delimiter, h.E_mod, delimiter, t.Format(time.UnixDate), delimiter, h.Msec)
+	evdesc, _ := getEventName(h.E_type)
+	fmt.Fprintf(file, "header%s%v%s%v%s%s%s%v%s%v%s%v", delimiter, h.Size, delimiter, h.Version, delimiter,
+				//h.E_type, delimiter, h.E_mod, delimiter, t.Format(time.UnixDate), delimiter, h.Msec)
+				evdesc, delimiter, h.E_mod, delimiter, t.Format(time.UnixDate), delimiter, h.Msec)
 	if 0 == (flags & PRT_ONELINE) {
 		fmt.Fprintf(file, "\n")
 	} else {

main.go

@@ -4,27 +4,26 @@
 // godit is a search tool for BSM audit trails used by FreeBSD auditd
 //
 
-package main
-
 /*
-#cgo CFLAGS: -I /usr/lib
+% time ./godit 20211228134923.20211228151348 > godit.log
-#cgo LDFLAGS: -L. -lbsm -lc
+11.599u 38.235s 0:48.25 103.2%  1045+553k 1+2262168io 4pf+0w
-#include <stdlib.h>
+% time praudit -l /home/yo/Dev/go/godit/20211228134923.20211228151348 > praudit.log
-#include <bsm/libbsm.h>
+101.728u 7.315s 1:49.09 99.9%   10+167k 0+191152io 0pf+0w
+% ./godit -V
+Godit v0.03
 */
-import "C"
+
-import "unsafe"
+package main
 
 import (
 	"io"
 	"os"
 	"fmt"
-//	"encoding/hex"
 	"github.com/spf13/pflag"
 )
 
 const (
-	version = "0.02"
+	version = "0.03"
 )
 
 var (
@@ -36,73 +35,6 @@ var (
 )
 
 
-/*
-// This function only work on full file for the moment
-// It is essentially a rip of praudit:print_tokens function
-
- It is SLOW:
-
-yo@martine:~/Dev/go/godit % time praudit -l /home/yo/Dev/go/godit/20211228134923.20211228151348 > praudit.log
-102.428u 8.496s 1:50.98 99.9%   10+167k 0+191152io 0pf+0w
-
-yo@martine:~/Dev/go/godit % time ./godit 20211228134923.20211228151348 > godit.log
-232.573u 56.834s 5:12.00 92.7%  859+553k 0+381988io 0pf+0w
-
-*/
-func print_tokens(filename string) error {
-	var buf			*C.u_char
-	var recLen 		C.int
-	var bytesRead	C.int
-	var tok			C.tokenstr_t
-	var del			*C.char
-	var fp			*C.FILE
-	var cFilename	*C.char
-	var r			*C.char
-
-	del = C.CString(delimiter)
-	r = C.CString("r")
-
-	cFilename = C.CString(filename)
-	fp = C.fopen(cFilename, r)
-	if fp == nil {
-		return fmt.Errorf("Error opening file %s\n", filename)
-	}
-
-	for recLen != -1 {
-		recLen = C.au_read_rec(fp, &buf)
-		if recLen == -1 {
-			break
-		}
-		bytesRead = 0
-		for bytesRead < recLen {
-			newstart := unsafe.Add(unsafe.Pointer(buf), bytesRead)
-			if( -1 == C.au_fetch_tok(&tok, (*C.u_char)(newstart), recLen - bytesRead)) {
-				break
-			}
-			C.au_print_flags_tok((*C.FILE)(C.stdout), &tok, del, C.AU_OFLAG_NONE)
-		
-			bytesRead += (C.int)(tok.len)
-			// fmt.Printf is buffered, its use cause a time glitch on display
-			C.putchar((C.int)(*del))
-		}
-		fmt.Printf("\n")
-		C.fflush((*C.FILE)(C.stdout))
-		
-		// buf was allocated by au_read_rec(), we need to free it
-		C.free(unsafe.Pointer(buf))
-
-	}
-
-	C.fclose(fp)
-
-	C.free(unsafe.Pointer(cFilename))
-	C.free(unsafe.Pointer(del))
-	C.free(unsafe.Pointer(r))
-
-	return nil
-}
-
-
 func main() {
 	var flags int
 	var oneLine bool