-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
action_process.go
184 lines (171 loc) · 4.93 KB
/
action_process.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
package server
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha256"
"encoding/base64"
"io"
"net"
"github.com/rafaeljusto/goe2ee/protocol"
)
func (h HandlerV1) processHandler(requestCommon protocol.RequestCommon, conn net.Conn) error {
request, err := protocol.ParseProcessRequest(requestCommon, conn)
if err != nil {
h.logger.Printf("failed to parse process action request: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeMalformedRequest,
"failed to parse data of the request",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
id := request.ID()
idHash := sha256.New()
host, _, err := net.SplitHostPort(conn.RemoteAddr().String())
if err != nil {
h.logger.Printf("failed to split host and port: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to split host and port",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
if n, err := idHash.Write([]byte(host)); err != nil {
h.logger.Printf("failed to write host to hash: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to write host to hash",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
} else if n != len(host) {
h.logger.Printf("failed to write host to hash: expected writing %d bytes but wrote %d bytes", len(host), n)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to write host to hash",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
if n, err := idHash.Write(id[:]); err != nil {
h.logger.Printf("failed to write ID to hash: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to write ID to hash",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
} else if n != len(id) {
h.logger.Printf("failed to write ID to hash: expected writing %d bytes but wrote %d bytes", len(id), n)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to write ID to hash",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
secret, ok := h.secrets.Load(base64.StdEncoding.EncodeToString(idHash.Sum(nil)))
if !ok {
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeUnknownClient,
"could not find a shared secret matching the given ID",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
aes, err := aes.NewCipher(secret)
if err != nil {
h.logger.Printf("failed to create AES cipher: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to create AES cipher",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
gcm, err := cipher.NewGCM(aes)
if err != nil {
h.logger.Printf("failed to create GCM cipher: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to create GCM cipher",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
nonceSize := gcm.NonceSize()
encryptedMessage := request.Message()
nonce, ciphertext := encryptedMessage[:nonceSize], encryptedMessage[nonceSize:]
message, err := gcm.Open(nil, nonce, ciphertext, nil)
if err != nil {
h.logger.Printf("failed to decrypt message: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to decrypt message",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
var writer io.Writer
if request.ExpectReply() {
writer = &bytes.Buffer{}
} else {
writer = io.Discard
}
reader := bytes.NewBuffer(message)
if err := h.handler.Handle(writer, reader, conn.RemoteAddr()); err != nil {
h.logger.Printf("failed to handle message: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to handle message",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
nonce = make([]byte, gcm.NonceSize())
_, err = rand.Read(nonce)
if err != nil {
h.logger.Printf("failed to generate nonce: %v", err)
errResponse := protocol.NewErrorResponse(
protocol.ErrorCodeServerError,
"failed to generate nonce",
).Bytes()
if !h.writeErrorResponse(conn, errResponse) {
return io.ErrShortWrite
}
return nil
}
if request.ExpectReply() {
writerBuffer := writer.(*bytes.Buffer)
response := protocol.NewProcessResponse(gcm.Seal(nonce, nonce, writerBuffer.Bytes(), nil)).Bytes()
if !h.writeResponse(conn, requestCommon.Action(), response) {
return io.ErrShortWrite
}
}
return nil
}