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
254
255
256
257
258
259
260
|
package config
import (
"encoding/json"
"errors"
"fmt"
"net"
"os"
"path/filepath"
"sort"
"strconv"
"strings"
)
const appDir = "aegis"
type Settings struct {
Host string `json:"host"`
Port string `json:"port"`
UseTLS bool `json:"use_tls"`
StartTLS bool `json:"start_tls,omitempty"`
SkipTLSVerify bool `json:"skip_tls_verify,omitempty"`
Username string `json:"username,omitempty"`
SASLMechanism string `json:"sasl_mechanism,omitempty"`
UseCompression bool `json:"use_compression,omitempty"`
SMTPHost string `json:"smtp_host,omitempty"`
SMTPPort string `json:"smtp_port,omitempty"`
SMTPMode string `json:"smtp_mode,omitempty"`
SMTPUsername string `json:"smtp_username,omitempty"`
SMTPEmail string `json:"smtp_email,omitempty"`
SMTPRecipient string `json:"smtp_recipient,omitempty"`
SMTPSkipVerify bool `json:"smtp_skip_tls_verify,omitempty"`
ProxyType string `json:"proxy_type"`
ProxyAddress string `json:"proxy_address,omitempty"`
DisplayName string `json:"display_name,omitempty"`
Email string `json:"email,omitempty"`
Subscriptions []string `json:"subscriptions,omitempty"`
}
func Default() Settings {
return Settings{
Host: "news.tcpreset.net",
Port: "563",
UseTLS: true,
SMTPHost: "qee4i7sags6phsvb2yodwecfj7noimfhhalsjktsvikrwotxzis3raad.onion",
SMTPPort: "25",
SMTPRecipient: "mail2news@mail2news.tcpreset.net",
ProxyType: "SOCKS5",
ProxyAddress: "127.0.0.1:9050",
}
}
func DefaultPath() (string, error) {
dir, err := os.UserConfigDir()
if err != nil {
return "", fmt.Errorf("locate user configuration directory: %w", err)
}
return filepath.Join(dir, appDir, "config.json"), nil
}
func Load(path string) (Settings, error) {
settings := Default()
data, err := os.ReadFile(path)
if errors.Is(err, os.ErrNotExist) {
return settings, nil
}
if err != nil {
return Settings{}, fmt.Errorf("read settings: %w", err)
}
if err := json.Unmarshal(data, &settings); err != nil {
return Settings{}, fmt.Errorf("decode settings: %w", err)
}
settings.normalize()
if err := settings.Validate(); err != nil {
return Settings{}, fmt.Errorf("validate saved settings: %w", err)
}
return settings, nil
}
func Save(path string, settings Settings) error {
settings.normalize()
if err := settings.Validate(); err != nil {
return err
}
data, err := json.MarshalIndent(settings, "", " ")
if err != nil {
return fmt.Errorf("encode settings: %w", err)
}
data = append(data, '\n')
dir := filepath.Dir(path)
if err := os.MkdirAll(dir, 0o700); err != nil {
return fmt.Errorf("create settings directory: %w", err)
}
if err := os.Chmod(dir, 0o700); err != nil {
return fmt.Errorf("protect settings directory: %w", err)
}
tmp, err := os.CreateTemp(dir, ".config-*.tmp")
if err != nil {
return fmt.Errorf("create temporary settings file: %w", err)
}
tmpName := tmp.Name()
defer os.Remove(tmpName)
if err := tmp.Chmod(0o600); err != nil {
tmp.Close()
return fmt.Errorf("protect temporary settings file: %w", err)
}
if _, err := tmp.Write(data); err != nil {
tmp.Close()
return fmt.Errorf("write settings: %w", err)
}
if err := tmp.Sync(); err != nil {
tmp.Close()
return fmt.Errorf("sync settings: %w", err)
}
if err := tmp.Close(); err != nil {
return fmt.Errorf("close settings: %w", err)
}
if err := os.Rename(tmpName, path); err != nil {
return fmt.Errorf("commit settings: %w", err)
}
return nil
}
func (s Settings) Validate() error {
if err := validateToken("host", s.Host); err != nil {
return err
}
if net.ParseIP(s.Host) == nil && strings.ContainsAny(s.Host, " /\\") {
return errors.New("host contains invalid characters")
}
port, err := strconv.Atoi(s.Port)
if err != nil || port < 1 || port > 65535 {
return errors.New("port must be between 1 and 65535")
}
if err := validateToken("username", s.Username); err != nil {
return err
}
if s.Username != "" && !s.UseTLS {
return errors.New("authentication requires TLS")
}
if s.StartTLS && !s.UseTLS {
return errors.New("STARTTLS requires TLS")
}
if s.SASLMechanism != "" && !strings.EqualFold(s.SASLMechanism, "PLAIN") {
return errors.New("unsupported SASL mechanism")
}
if s.SASLMechanism != "" && s.Username == "" {
return errors.New("SASL requires a username")
}
if s.UseCompression && s.UseTLS {
return errors.New("COMPRESS DEFLATE cannot be used with TLS")
}
if err := validateSMTP(s); err != nil {
return err
}
switch s.ProxyType {
case "DIRECT":
case "SOCKS5":
if _, _, err := net.SplitHostPort(s.ProxyAddress); err != nil {
return fmt.Errorf("invalid SOCKS5 address: %w", err)
}
default:
return errors.New("proxy type must be DIRECT or SOCKS5")
}
if strings.ContainsAny(s.DisplayName, "\r\n") || strings.ContainsAny(s.Email+s.SMTPEmail+s.SMTPRecipient, "\r\n") {
return errors.New("posting identity must not contain line breaks")
}
for _, group := range s.Subscriptions {
if err := ValidateGroupName(group); err != nil {
return fmt.Errorf("invalid subscription %q: %w", group, err)
}
}
return nil
}
func ValidateGroupName(group string) error {
if err := validateToken("newsgroup", group); err != nil {
return err
}
if strings.ContainsAny(group, " ,") {
return errors.New("newsgroup contains invalid characters")
}
return nil
}
func (s *Settings) normalize() {
s.Host = strings.TrimSpace(s.Host)
s.Port = strings.TrimSpace(s.Port)
s.Username = strings.TrimSpace(s.Username)
s.SASLMechanism = strings.ToUpper(strings.TrimSpace(s.SASLMechanism))
s.SMTPHost = strings.TrimSpace(s.SMTPHost)
s.SMTPPort = strings.TrimSpace(s.SMTPPort)
s.SMTPMode = strings.ToUpper(strings.TrimSpace(s.SMTPMode))
if s.SMTPMode == "DISABLED" || s.SMTPMode == "CLEARTEXT" {
s.SMTPMode = ""
}
s.SMTPUsername = strings.TrimSpace(s.SMTPUsername)
s.SMTPEmail = strings.TrimSpace(s.SMTPEmail)
s.SMTPRecipient = strings.TrimSpace(s.SMTPRecipient)
s.ProxyType = strings.ToUpper(strings.TrimSpace(s.ProxyType))
s.ProxyAddress = strings.TrimSpace(s.ProxyAddress)
s.DisplayName = strings.TrimSpace(s.DisplayName)
s.Email = strings.TrimSpace(s.Email)
seen := make(map[string]struct{}, len(s.Subscriptions))
groups := s.Subscriptions[:0]
for _, group := range s.Subscriptions {
group = strings.TrimSpace(group)
if group == "" {
continue
}
if _, ok := seen[group]; ok {
continue
}
seen[group] = struct{}{}
groups = append(groups, group)
}
sort.Strings(groups)
s.Subscriptions = groups
}
func validateSMTP(s Settings) error {
if s.SMTPHost == "" && s.SMTPMode == "" && s.SMTPPort == "" {
return nil
}
if s.SMTPHost == "" || s.SMTPPort == "" {
return errors.New("SMTP host and port are required when SMTP is configured")
}
if err := validateToken("SMTP host", s.SMTPHost); err != nil {
return err
}
if net.ParseIP(s.SMTPHost) == nil && strings.ContainsAny(s.SMTPHost, " /\\") {
return errors.New("SMTP host contains invalid characters")
}
port, err := strconv.Atoi(s.SMTPPort)
if err != nil || port < 1 || port > 65535 {
return errors.New("SMTP port must be between 1 and 65535")
}
switch s.SMTPMode {
case "", "TLS", "STARTTLS":
default:
return errors.New("SMTP mode must be cleartext, TLS or STARTTLS")
}
if s.SMTPUsername != "" && s.SMTPMode == "" {
return errors.New("SMTP authentication requires TLS or STARTTLS")
}
if strings.HasSuffix(strings.ToLower(s.SMTPHost), ".onion") && s.ProxyType != "SOCKS5" {
return errors.New(".onion SMTP servers require a SOCKS5 proxy")
}
return nil
}
func validateToken(name, value string) error {
if name == "host" && value == "" {
return errors.New("host is required")
}
if strings.ContainsAny(value, "\x00\r\n\t") {
return fmt.Errorf("%s contains control characters", name)
}
return nil
}
|
