/
reader.go
253 lines (211 loc) · 5.79 KB
/
reader.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
package config
import (
"bytes"
"compress/gzip"
"context"
"io"
"os"
"path"
"strconv"
"strings"
"sync"
"time"
"github.com/gorilla/websocket"
"github.com/notion/bastion/asciicast"
"golang.org/x/crypto/ssh"
)
// NewAsciicastReadCloser initializes an AsciiCast ReaderCloser for SSH logging
func NewAsciicastReadCloser(r io.ReadCloser, conn ssh.ConnMetadata, width int, height int, chanInfo *ConnChan, env *Env) io.ReadCloser {
closer := &AsciicastReadCloser{
ReadCloser: r,
SSHConn: conn,
Time: time.Now(),
Cast: &asciicast.Cast{
Header: &asciicast.Header{
Version: 2,
Width: width,
Height: height,
Timestamp: time.Now().Unix(),
},
},
Env: env,
Mutex: &sync.Mutex{},
ChanInfo: chanInfo,
}
if val, ok := env.SSHProxyClients.Load(conn.RemoteAddr().String()); ok {
client := val.(*SSHProxyClient)
chanInfo.Closer = closer
client.Mutex.Lock()
closer.SidKey = strconv.Itoa(len(client.SSHShellSessions))
client.Mutex.Unlock()
closer.User = client.SSHServerClient.User
closer.Host = client.SSHServerClient.ProxyTo
closer.Hostname = client.SSHServerClient.ProxyToHostname
closer.Name = client.SSHServerClient.Client.RemoteAddr().String()
closer.FileName = closer.Time.Format("2006-01-02 15:04:05") + " " + closer.Name
closer.Users = closer.User.Email
}
var w io.WriteCloser
if env.LogsBucket != nil {
bkt := env.LogsBucket
ctx := context.Background()
objHandler := bkt.Object(closer.FileName)
w = objHandler.NewWriter(ctx)
closer.BkWriter = w
closer.BkContext = ctx
} else if env.Vconfig.GetBool("sessions.enabled") {
_ = os.Mkdir(env.Vconfig.GetString("sessions.directory"), os.ModePerm)
file, err := os.Create(path.Join(env.Vconfig.GetString("sessions.directory"), closer.FileName))
if err != nil {
env.Red.Println("Error creating file to disk", err)
}
closer.BkWriter = file
w = file
}
if w != nil {
closer.GZWriter = gzip.NewWriter(w)
marshalledHeader, err := closer.Cast.Header.Marshal()
if err != nil {
env.Red.Println("Error marshalling header", err)
}
marshalledHeader = append(marshalledHeader, []byte("\n")...)
_, err = closer.GZWriter.Write(marshalledHeader)
if err != nil {
env.Red.Println("Error writing header to bucket object", err)
}
}
return closer
}
// AsciicastReadCloser is the main Asciicast ReadCloser
type AsciicastReadCloser struct {
io.ReadCloser
Name string
FileName string
SSHConn ssh.ConnMetadata
Cast *asciicast.Cast
Time time.Time
Buffer bytes.Buffer
Env *Env
BkWriter io.WriteCloser
BkContext context.Context
GZWriter *gzip.Writer
User *User
Host string
Hostname string
SidKey string
CurrentUser string
Mutex *sync.Mutex
Users string
ChanInfo *ConnChan
}
func (lr *AsciicastReadCloser) Read(p []byte) (n int, err error) {
n, err = lr.ReadCloser.Read(p)
now := time.Now()
duration := now.Sub(lr.Time).Seconds()
readBytes := p[0:n]
if len(string(readBytes)) == 0 {
return n, err
}
lr.Mutex.Lock()
currentUser := lr.CurrentUser
lr.Mutex.Unlock()
if currentUser == "" {
currentUser = lr.User.Email
}
newFrame := &asciicast.Frame{
Time: duration,
Event: "o",
Data: string(readBytes),
Author: currentUser,
}
if !strings.Contains(lr.Users, currentUser) {
lr.Users += ", " + currentUser
}
if currentUser != "" && strings.HasSuffix(string(readBytes), ":~# ") {
lr.Mutex.Lock()
lr.CurrentUser = ""
lr.Mutex.Unlock()
}
marshalledFrame, err := newFrame.Marshal()
if err != nil {
lr.Env.Red.Println("Error marshalling frame", err)
}
marshalledFrame = append(marshalledFrame, []byte("\n")...)
_, err = lr.GZWriter.Write(marshalledFrame)
if err != nil {
lr.Env.Red.Println("Error writing frame to bucket object", err)
}
pathKey := lr.SSHConn.RemoteAddr().String()
sidKey := lr.SidKey
if proxyClientInterface, ok := lr.Env.SSHProxyClients.Load(pathKey); ok {
proxyClient := proxyClientInterface.(*SSHProxyClient)
if clients, ok := lr.Env.WebsocketClients.Load(pathKey + sidKey); ok {
wsClientMap := clients.(map[string]*WsClient)
for _, v := range wsClientMap {
proxyClient.Mutex.Lock()
wsClient := v.Client
wsWriter, err := wsClient.NextWriter(websocket.TextMessage)
if err != nil {
lr.Env.Red.Println("wsWriter error:", err)
} else {
wsWriter.Write(readBytes)
wsWriter.Close()
}
proxyClient.Mutex.Unlock()
}
}
}
if len(lr.Cast.Frames) > 20 {
lr.Cast.Frames = append(lr.Cast.Frames[1:], newFrame)
} else {
lr.Cast.Frames = append(lr.Cast.Frames, newFrame)
}
return n, err
}
// Close closes the ReadCloser and uploads it to Google Cloud Storage
func (lr *AsciicastReadCloser) Close() error {
data, err := lr.Cast.Marshal()
if err != nil {
lr.Env.Red.Println("Error logging session", err)
}
dbid := lr.ChanInfo.DBID
if val, ok := lr.Env.SSHProxyClients.Load(lr.SSHConn.RemoteAddr().String()); ok {
client := val.(*SSHProxyClient)
client.Mutex.Lock()
for _, v := range lr.ChanInfo.Reqs {
if v.ReqType == "shell" || v.ReqType == "exec" {
command := ""
if string(v.ReqData) == "" {
command = "Main Shell"
} else {
command = string(v.ReqData)
}
lr.Cast.Header.Command = command
break
}
}
client.Mutex.Unlock()
}
session := &Session{
Name: lr.FileName,
Time: lr.Time,
Cast: data,
Host: lr.Host,
Hostname: lr.Hostname,
Users: lr.Users,
Command: lr.Cast.Header.Command,
}
if lr.User != nil {
session.UserID = lr.User.ID
}
lr.Env.DB.Save(session)
if lr.Env.Vconfig.GetBool("multihost.enabled") {
lr.Env.DB.Delete(&LiveSession{}, dbid)
}
err = lr.GZWriter.Close()
err = lr.BkWriter.Close()
if err != nil {
lr.Env.Red.Println("Error closing bucket writer", err)
}
return lr.ReadCloser.Close()
}