608 lines
14 KiB
Go
608 lines
14 KiB
Go
package logcompiler
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import (
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"encoding/json"
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"errors"
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"fmt"
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"html/template"
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"io"
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"io/ioutil"
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"log"
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"math"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"time"
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"github.com/gomodule/redigo/redis"
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"gonum.org/v1/plot"
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"gonum.org/v1/plot/plotter"
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"gonum.org/v1/plot/plotutil"
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"gonum.org/v1/plot/vg"
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)
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// SSHDCompiler Holds a struct that corresponds to a sshd groked line
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// and the redis connections
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type SSHDCompiler struct {
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CompilerStruct
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}
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// GrokedSSHD map JSON fields to Go struct
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type GrokedSSHD struct {
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SSHMessage string `json:"ssh_message"`
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SyslogPid string `json:"syslog_pid"`
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SyslogHostname string `json:"syslog_hostname"`
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SyslogTimestamp string `json:"syslog_timestamp"`
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SshdClientIP string `json:"sshd_client_ip"`
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SyslogProgram string `json:"syslog_program"`
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SshdInvalidUser string `json:"sshd_invalid_user"`
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}
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// Flush recomputes statistics and recompile HTML output
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// TODO : review after refacto
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func (s *SSHDCompiler) Flush() error {
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log.Println("Flushing")
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r1 := *s.r1
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r0 := *s.r0
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// writing in database 1
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if _, err := r1.Do("SELECT", 1); err != nil {
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s.teardown(err)
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}
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// flush stats DB
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if _, err := r1.Do("FLUSHDB"); err != nil {
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s.teardown(err)
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}
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log.Println("Statistics Database Flushed")
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// reading from database 0
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if _, err := r0.Do("SELECT", 0); err != nil {
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s.teardown(err)
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}
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// Compile statistics / html output for each line
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keys, err := redis.Strings(r0.Do("KEYS", "*"))
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if err != nil {
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s.teardown(err)
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}
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for _, v := range keys {
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dateHost := strings.Split(v, ":")
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kkeys, err := redis.StringMap(r0.Do("HGETALL", v))
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if err != nil {
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s.teardown(err)
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}
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dateInt, err := strconv.ParseInt(dateHost[0], 10, 64)
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if err != nil {
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s.teardown(err)
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}
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parsedTime := time.Unix(dateInt, 0)
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err = compileStats(s, parsedTime, kkeys["src"], kkeys["username"], dateHost[1])
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if err != nil {
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s.teardown(err)
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}
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}
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return nil
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}
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// Pull pulls a line of groked sshd logline from redis
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func (s *SSHDCompiler) Pull(c chan error) {
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r1 := *s.r1
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jsoner := json.NewDecoder(s.reader)
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DecodeLoop:
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for jsoner.More() {
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var m GrokedSSHD
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err := jsoner.Decode(&m)
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if err := jsoner.Decode(&m); err == io.EOF {
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// In case of EOF, we wait for the reader to have
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// new data available
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time.Sleep(s.retryPeriod)
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continue DecodeLoop
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} else if err != nil {
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log.Fatal(err)
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}
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fmt.Printf("time: %s, hostname: %s, client_ip: %s, user: %s\n", m.SyslogTimestamp, m.SyslogHostname, m.SshdClientIP, m.SshdInvalidUser)
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// Assumes the system parses logs recorded during the current year
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m.SyslogTimestamp = fmt.Sprintf("%v %v", m.SyslogTimestamp, time.Now().Year())
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// TODO Make this automatic or a config parameter
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loc, _ := time.LoadLocation("Europe/Luxembourg")
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parsedTime, _ := time.ParseInLocation("Jan 2 15:04:05 2006", m.SyslogTimestamp, loc)
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m.SyslogTimestamp = string(strconv.FormatInt(parsedTime.Unix(), 10))
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// Pushing loglines in database 0
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if _, err := r1.Do("SELECT", 0); err != nil {
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s.teardown(err)
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}
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// Writing logs
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_, err = redis.Bool(r1.Do("HSET", fmt.Sprintf("%v:%v", m.SyslogTimestamp, m.SyslogHostname), "username", m.SshdInvalidUser, "src", m.SshdClientIP))
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if err != nil {
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s.teardown(err)
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}
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err = compileStats(s, parsedTime, m.SshdClientIP, m.SshdInvalidUser, m.SyslogHostname)
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if err != nil {
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s.teardown(err)
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}
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// Compiler html / jsons
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s.nbLines++
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if s.nbLines > s.compilationTrigger {
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s.nbLines = 0
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//Non-blocking
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if !s.compiling {
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go s.compile()
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}
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}
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}
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}
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func compileStats(s *SSHDCompiler, parsedTime time.Time, src string, username string, host string) error {
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r := *s.r1
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// Pushing statistics in database 1
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if _, err := r.Do("SELECT", 1); err != nil {
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s.teardown(err)
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}
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// Daily
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dstr := fmt.Sprintf("%v%v%v", parsedTime.Year(), fmt.Sprintf("%02d", int(parsedTime.Month())), fmt.Sprintf("%02d", int(parsedTime.Day())))
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// Check current entry date as oldest if older than the current
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if oldest, err := redis.String(r.Do("GET", "oldest")); err == redis.ErrNil {
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r.Do("SET", "oldest", dstr)
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} else if err != nil {
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s.teardown(err)
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} else {
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// Check if dates are the same
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if oldest != dstr {
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// Check who is the oldest
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parsedOldest, _ := time.Parse("20060102", oldest)
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if parsedTime.Before(parsedOldest) {
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r.Do("SET", "oldest", dstr)
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}
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}
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}
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// Check current entry date as oldest if older than the current
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if newest, err := redis.String(r.Do("GET", "newest")); err == redis.ErrNil {
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r.Do("SET", "newest", dstr)
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} else if err != nil {
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s.teardown(err)
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} else {
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// Check if dates are the same
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if newest != dstr {
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// Check who is the newest
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parsedNewest, _ := time.Parse("20060102", newest)
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if parsedTime.After(parsedNewest) {
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r.Do("SET", "newest", dstr)
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}
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}
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}
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err := compileStat(s, dstr, "daily", src, username, host)
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if err != nil {
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s.teardown(err)
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}
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// Monthly
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mstr := fmt.Sprintf("%v%v", parsedTime.Year(), fmt.Sprintf("%02d", int(parsedTime.Month())))
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err = compileStat(s, mstr, "daily", src, username, host)
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if err != nil {
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s.teardown(err)
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}
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// Yearly
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ystr := fmt.Sprintf("%v", parsedTime.Year())
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err = compileStat(s, ystr, "daily", src, username, host)
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if err != nil {
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s.teardown(err)
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}
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return nil
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}
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func compileStat(s *SSHDCompiler, datestr string, mode string, src string, username string, host string) error {
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r := *s.r1
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_, err := redis.String(r.Do("ZINCRBY", fmt.Sprintf("%v:%v", datestr, "statssrc"), 1, src))
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if err != nil {
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return err
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}
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_, err = redis.String(r.Do("ZINCRBY", fmt.Sprintf("%v:%v", datestr, "statsusername"), 1, username))
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if err != nil {
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return err
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}
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_, err = redis.String(r.Do("ZINCRBY", fmt.Sprintf("%v:%v", datestr, "statshost"), 1, host))
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if err != nil {
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return err
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}
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_, err = redis.Int(r.Do("SADD", fmt.Sprintf("toupdate:%v", mode), fmt.Sprintf("%v:%v", datestr, "statssrc")))
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if err != nil {
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return err
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}
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_, err = redis.Int(r.Do("SADD", fmt.Sprintf("toupdate:%v", mode), fmt.Sprintf("%v:%v", datestr, "statsusername")))
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if err != nil {
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return err
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}
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_, err = redis.Int(r.Do("SADD", fmt.Sprintf("toupdate:%v", mode), fmt.Sprintf("%v:%v", datestr, "statshost")))
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if err != nil {
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return err
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}
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return nil
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}
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// compile create json and graphical representation of the results
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func (s *SSHDCompiler) compile() error {
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s.mu.Lock()
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s.compiling = true
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s.compilegr.Add(1)
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log.Println("[+] SSHD compiling")
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r := *s.r0
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// Pulling statistics from database 1
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if _, err := r.Do("SELECT", 1); err != nil {
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return err
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}
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// List days for which we need to update statistics
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toupdateD, err := redis.Strings(r.Do("SMEMBERS", "toupdate:daily"))
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if err != nil {
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return err
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}
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// Plot statistics for each day to update
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for _, v := range toupdateD {
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err = plotStats(s, v)
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if err != nil {
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return err
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}
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err = csvStats(s, v)
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if err != nil {
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return err
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}
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}
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// List months for which we need to update statistics
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toupdateM, err := redis.Strings(r.Do("SMEMBERS", "toupdate:monthly"))
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if err != nil {
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return err
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}
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// Plot statistics for each month to update
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for _, v := range toupdateM {
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err = plotStats(s, v)
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if err != nil {
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return err
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}
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}
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// List years for which we need to update statistics
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toupdateY, err := redis.Strings(r.Do("SMEMBERS", "toupdate:yearly"))
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if err != nil {
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return err
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}
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// Plot statistics for each year to update
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for _, v := range toupdateY {
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err = plotStats(s, v)
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if err != nil {
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return err
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}
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}
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// Get oldest / newest entries
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var newest string
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var oldest string
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if newest, err = redis.String(r.Do("GET", "newest")); err == redis.ErrNil {
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return err
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}
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if oldest, err = redis.String(r.Do("GET", "oldest")); err == redis.ErrNil {
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return err
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}
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parsedOldest, _ := time.Parse("20060102", oldest)
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parsedNewest, _ := time.Parse("20060102", newest)
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parsedOldestStr := parsedOldest.Format("2006-01-02")
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parsedNewestStr := parsedNewest.Format("2006-01-02")
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// Gettings list of years for which we have statistics
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reply, err := redis.Values(r.Do("SCAN", "0", "MATCH", "????:*", "COUNT", 1000))
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if err != nil {
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return err
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}
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var cursor int64
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var items []string
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_, err = redis.Scan(reply, &cursor, &items)
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if err != nil {
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return err
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}
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var years []string
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for _, v := range items {
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yearSplit := strings.Split(v, ":")
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found := false
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for _, y := range years {
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if y == yearSplit[0] {
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found = true
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}
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}
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if !found {
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years = append(years, yearSplit[0])
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}
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}
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// Gettings list of months for which we have statistics
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months := make(map[string][]string)
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for _, v := range years {
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var mraw []string
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reply, err = redis.Values(r.Do("SCAN", "0", "MATCH", v+"??:*", "COUNT", 1000))
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if err != nil {
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return err
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}
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_, err = redis.Scan(reply, &cursor, &mraw)
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if err != nil {
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return err
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}
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for _, m := range mraw {
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m = strings.TrimPrefix(m, v)
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monthSplit := strings.Split(m, ":")
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found := false
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for _, y := range months[v] {
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if y == monthSplit[0] {
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found = true
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}
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}
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if !found {
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months[v] = append(months[v], monthSplit[0])
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}
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}
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}
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// Parse Template
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t, err := template.ParseFiles(filepath.Join("logcompiler", "sshd", "statistics.gohtml"))
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if err != nil {
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return err
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}
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daily := struct {
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Title string
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MinDate string
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MaxDate string
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CurrentTime string
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}{
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Title: "sshd failed logins - daily statistics",
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MinDate: parsedOldestStr,
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MaxDate: parsedNewestStr,
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CurrentTime: parsedNewestStr,
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}
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monthly := struct {
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Title string
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MonthList map[string][]string
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CurrentTime string
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}{
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Title: "sshd failed logins - monthly statistics",
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MonthList: months,
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CurrentTime: parsedNewestStr,
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}
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yearly := struct {
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Title string
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YearList []string
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CurrentTime string
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}{
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Title: "sshd failed logins - yearly statistics",
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YearList: years,
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CurrentTime: parsedNewestStr,
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}
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// Create folder to store resulting files
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if _, err := os.Stat("data"); os.IsNotExist(err) {
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err := os.Mkdir("data", 0700)
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if err != nil {
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return err
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}
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}
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if _, err := os.Stat(filepath.Join("data", "sshd")); os.IsNotExist(err) {
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err := os.Mkdir(filepath.Join("data", "sshd"), 0700)
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if err != nil {
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return err
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}
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}
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_ = os.Remove(filepath.Join("data", "sshd", "dailystatistics.html"))
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_ = os.Remove(filepath.Join("data", "sshd", "monthlystatistics.html"))
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_ = os.Remove(filepath.Join("data", "sshd", "yearlystatistics.html"))
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f, err := os.OpenFile(filepath.Join("data", "sshd", "dailystatistics.html"), os.O_RDWR|os.O_CREATE, 0666)
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defer f.Close()
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// err = t.Execute(f, daily)
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err = t.ExecuteTemplate(f, "headertpl", daily)
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err = t.ExecuteTemplate(f, "dailytpl", daily)
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err = t.ExecuteTemplate(f, "footertpl", daily)
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if err != nil {
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return err
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}
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f, err = os.OpenFile(filepath.Join("data", "sshd", "monthlystatistics.html"), os.O_RDWR|os.O_CREATE, 0666)
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defer f.Close()
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// err = t.Execute(f, monthly)
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err = t.ExecuteTemplate(f, "headertpl", monthly)
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err = t.ExecuteTemplate(f, "monthlytpl", monthly)
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err = t.ExecuteTemplate(f, "footertpl", monthly)
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if err != nil {
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return err
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}
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f, err = os.OpenFile(filepath.Join("data", "sshd", "yearlystatistics.html"), os.O_RDWR|os.O_CREATE, 0666)
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defer f.Close()
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// err = t.Execute(f, yearly)
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err = t.ExecuteTemplate(f, "headertpl", yearly)
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err = t.ExecuteTemplate(f, "yearlytpl", yearly)
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err = t.ExecuteTemplate(f, "footertpl", yearly)
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if err != nil {
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return err
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}
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// Copy js asset file
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input, err := ioutil.ReadFile(filepath.Join("logcompiler", "sshd", "load.js"))
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if err != nil {
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return err
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}
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err = ioutil.WriteFile(filepath.Join("data", "sshd", "load.js"), input, 0644)
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if err != nil {
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return err
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}
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log.Println("[-] SSHD compiling finished.")
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s.compiling = false
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s.mu.Unlock()
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// Tell main program we can exit if needed now
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s.compilegr.Done()
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return nil
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}
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func csvStats(s *SSHDCompiler, v string) error {
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r := *s.r0
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zrank, err := redis.Strings(r.Do("ZRANGEBYSCORE", v, "-inf", "+inf", "WITHSCORES"))
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if err != nil {
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return err
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}
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stype := strings.Split(v, ":")
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// Create folder to store data
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if _, err := os.Stat("data"); os.IsNotExist(err) {
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err := os.Mkdir("data", 0700)
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if err != nil {
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return err
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}
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}
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if _, err := os.Stat(filepath.Join("data", "sshd")); os.IsNotExist(err) {
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err := os.Mkdir(filepath.Join("data", "sshd"), 0700)
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if err != nil {
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return err
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}
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}
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if _, err := os.Stat(filepath.Join("data", "sshd", stype[0])); os.IsNotExist(err) {
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err := os.Mkdir(filepath.Join("data", "sshd", stype[0]), 0700)
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if err != nil {
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return err
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}
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}
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var file *os.File
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if file, err = os.Create(filepath.Join("data", "sshd", stype[0], fmt.Sprintf("%v.csv", v))); err != nil {
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return err
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}
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defer file.Close()
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for k, v := range zrank {
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// pair: keys
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if (k % 2) == 0 {
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fmt.Fprintf(file, "%s, ", v)
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// even: values
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} else {
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fmt.Fprintln(file, v)
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}
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}
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return nil
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}
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func plotStats(s *SSHDCompiler, v string) error {
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r := *s.r0
|
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zrank, err := redis.Strings(r.Do("ZRANGEBYSCORE", v, "-inf", "+inf", "WITHSCORES"))
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
// Split keys and values - keep these ordered
|
|
values := plotter.Values{}
|
|
keys := make([]string, 0, len(zrank)/2)
|
|
|
|
for k, v := range zrank {
|
|
// keys
|
|
if (k % 2) == 0 {
|
|
keys = append(keys, zrank[k])
|
|
// values
|
|
} else {
|
|
fv, _ := strconv.ParseFloat(v, 64)
|
|
values = append(values, fv)
|
|
}
|
|
}
|
|
|
|
p, err := plot.New()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
stype := strings.Split(v, ":")
|
|
switch stype[1] {
|
|
case "statsusername":
|
|
p.Title.Text = "Usernames"
|
|
case "statssrc":
|
|
p.Title.Text = "Source IP"
|
|
case "statshost":
|
|
p.Title.Text = "Host"
|
|
default:
|
|
p.Title.Text = ""
|
|
return errors.New("we should not reach this point, open an issue")
|
|
}
|
|
|
|
p.Y.Label.Text = "Count"
|
|
w := 0.5 * vg.Centimeter
|
|
bc, err := plotter.NewBarChart(values, w)
|
|
bc.Horizontal = true
|
|
if err != nil {
|
|
return err
|
|
}
|
|
bc.LineStyle.Width = vg.Length(0)
|
|
bc.Color = plotutil.Color(2)
|
|
|
|
p.Add(bc)
|
|
p.NominalY(keys...)
|
|
|
|
// Create folder to store plots
|
|
if _, err := os.Stat("data"); os.IsNotExist(err) {
|
|
err := os.Mkdir("data", 0700)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if _, err := os.Stat(filepath.Join("data", "sshd")); os.IsNotExist(err) {
|
|
err := os.Mkdir(filepath.Join("data", "sshd"), 0700)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
if _, err := os.Stat(filepath.Join("data", "sshd", stype[0])); os.IsNotExist(err) {
|
|
err := os.Mkdir(filepath.Join("data", "sshd", stype[0]), 0700)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
xsize := 3 + vg.Length(math.Round(float64(len(keys)/2)))
|
|
if err := p.Save(15*vg.Centimeter, xsize*vg.Centimeter, filepath.Join("data", "sshd", stype[0], fmt.Sprintf("%v.svg", v))); err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|