Resolve event name
This commit is contained in:
parent
8fd6e20cbd
commit
92ba4e4ca6
61
libbsm.go
61
libbsm.go
@ -23,7 +23,9 @@ import (
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"os"
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"fmt"
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"time"
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"bufio"
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"bytes"
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"strings"
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"strconv"
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"encoding/binary"
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)
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@ -31,6 +33,8 @@ import (
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const (
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// bsm/libbsm.h
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AUDIT_MAX_ARGS = 128
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AUDIT_EVENT_FILE = "/etc/security/audit_event"
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// sys/bsm/audit.h
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MAXAUDITDATA = (0x8000 - 1)
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MAX_AUDIT_RECORD_SIZE = MAXAUDITDATA
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@ -119,8 +123,19 @@ var (
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gUsers []user
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// A global group/gid cache
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gGroups []group
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// Cache of audit_event file
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gEventDB []event
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)
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type event struct {
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Type int
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Name string
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Desc string
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Class string
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}
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// Fields types, from https://github.com/freebsd/freebsd-src/blob/main/contrib/openbsm/bsm/libbsm.h
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// Abstraction of a record
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@ -394,6 +409,45 @@ func getGroupNameByGid(gid uint32) (group, error) {
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return grp, nil
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}
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func getEventName(event uint16) (string,error) {
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if len(gEventDB) == 0 {
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loadEventDB()
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}
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for _, ev := range gEventDB {
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if ev.Type == int(event) {
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return ev.Desc, nil
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}
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}
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return "", fmt.Errorf("Event ID not found: %x\n", event)
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}
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// We load the entire file in memory
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func loadEventDB() error {
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file, err := os.Open(AUDIT_EVENT_FILE)
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if err != nil {
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return err
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}
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defer file.Close()
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fileScan := bufio.NewScanner(file)
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fileScan.Split(bufio.ScanLines)
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for fileScan.Scan() {
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line := fileScan.Text()
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if strings.HasPrefix(line, "#") {
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continue
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}
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eventStr := strings.Split(line, ":")
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if len(eventStr) != 4 {
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continue
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}
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t, _ := strconv.Atoi(eventStr[0])
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gEventDB = append(gEventDB, event{Type: t,
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Name: eventStr[1],
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Desc: eventStr[2],
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Class: eventStr[3],})
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}
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return nil
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}
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func PrintIpv4FromInt(ipv4int uint32) string {
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return fmt.Sprintf("%d.%d.%d.%d", ipv4int & 0xFF000000 >> 24, ipv4int & 0x00FF0000 >> 16,
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@ -460,8 +514,11 @@ func (h *Header32) LoadFromBinary(file *os.File) error {
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*/
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func (h *Header32) Print(file *os.File, delimiter string, flags int) {
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t := time.Unix((int64)(h.S), 0)
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fmt.Fprintf(file, "header%s%v%s%v%s%v%s%v%s%v%s%v", delimiter, h.Size, delimiter, h.Version, delimiter,
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h.E_type, delimiter, h.E_mod, delimiter, t.Format(time.UnixDate), delimiter, h.Msec)
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// We dont care for error
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evdesc, _ := getEventName(h.E_type)
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fmt.Fprintf(file, "header%s%v%s%v%s%s%s%v%s%v%s%v", delimiter, h.Size, delimiter, h.Version, delimiter,
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//h.E_type, delimiter, h.E_mod, delimiter, t.Format(time.UnixDate), delimiter, h.Msec)
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evdesc, delimiter, h.E_mod, delimiter, t.Format(time.UnixDate), delimiter, h.Msec)
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if 0 == (flags & PRT_ONELINE) {
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fmt.Fprintf(file, "\n")
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} else {
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86
main.go
86
main.go
@ -4,27 +4,26 @@
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// godit is a search tool for BSM audit trails used by FreeBSD auditd
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//
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package main
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/*
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#cgo CFLAGS: -I /usr/lib
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#cgo LDFLAGS: -L. -lbsm -lc
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#include <stdlib.h>
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#include <bsm/libbsm.h>
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% time ./godit 20211228134923.20211228151348 > godit.log
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11.599u 38.235s 0:48.25 103.2% 1045+553k 1+2262168io 4pf+0w
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% time praudit -l /home/yo/Dev/go/godit/20211228134923.20211228151348 > praudit.log
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101.728u 7.315s 1:49.09 99.9% 10+167k 0+191152io 0pf+0w
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% ./godit -V
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Godit v0.03
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*/
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import "C"
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import "unsafe"
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package main
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import (
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"io"
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"os"
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"fmt"
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// "encoding/hex"
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"github.com/spf13/pflag"
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)
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const (
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version = "0.02"
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version = "0.03"
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)
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var (
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@ -36,73 +35,6 @@ var (
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)
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/*
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// This function only work on full file for the moment
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// It is essentially a rip of praudit:print_tokens function
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It is SLOW:
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yo@martine:~/Dev/go/godit % time praudit -l /home/yo/Dev/go/godit/20211228134923.20211228151348 > praudit.log
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102.428u 8.496s 1:50.98 99.9% 10+167k 0+191152io 0pf+0w
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yo@martine:~/Dev/go/godit % time ./godit 20211228134923.20211228151348 > godit.log
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232.573u 56.834s 5:12.00 92.7% 859+553k 0+381988io 0pf+0w
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*/
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func print_tokens(filename string) error {
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var buf *C.u_char
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var recLen C.int
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var bytesRead C.int
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var tok C.tokenstr_t
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var del *C.char
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var fp *C.FILE
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var cFilename *C.char
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var r *C.char
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del = C.CString(delimiter)
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r = C.CString("r")
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cFilename = C.CString(filename)
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fp = C.fopen(cFilename, r)
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if fp == nil {
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return fmt.Errorf("Error opening file %s\n", filename)
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}
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for recLen != -1 {
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recLen = C.au_read_rec(fp, &buf)
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if recLen == -1 {
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break
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}
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bytesRead = 0
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for bytesRead < recLen {
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newstart := unsafe.Add(unsafe.Pointer(buf), bytesRead)
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if( -1 == C.au_fetch_tok(&tok, (*C.u_char)(newstart), recLen - bytesRead)) {
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break
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}
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C.au_print_flags_tok((*C.FILE)(C.stdout), &tok, del, C.AU_OFLAG_NONE)
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bytesRead += (C.int)(tok.len)
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// fmt.Printf is buffered, its use cause a time glitch on display
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C.putchar((C.int)(*del))
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}
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fmt.Printf("\n")
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C.fflush((*C.FILE)(C.stdout))
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// buf was allocated by au_read_rec(), we need to free it
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C.free(unsafe.Pointer(buf))
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}
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C.fclose(fp)
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C.free(unsafe.Pointer(cFilename))
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C.free(unsafe.Pointer(del))
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C.free(unsafe.Pointer(r))
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return nil
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}
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func main() {
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var flags int
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var oneLine bool
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