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
|
package eduvpn
import (
"fmt"
"github.com/jwijenbergh/eduvpn-common/internal"
)
type VPNState struct {
// The chosen server
Servers internal.Servers `json:"servers"`
// The list of servers and organizations from disco
Discovery internal.Discovery `json:"-"`
// The fsm
FSM internal.FSM `json:"-"`
// The logger
Logger internal.FileLogger `json:"-"`
// The config
Config internal.Config `json:"-"`
// Whether to enable debugging
Debug bool `json:"-"`
}
func (state *VPNState) Register(name string, directory string, stateCallback func(string, string, string), debug bool) error {
if !state.FSM.InState(internal.DEREGISTERED) {
return &StateWrongFSMStateError{Got: state.FSM.Current, Want: internal.DEREGISTERED}
}
// Initialize the logger
logLevel := internal.LOG_WARNING
if debug {
logLevel = internal.LOG_INFO
}
loggerErr := state.Logger.Init(logLevel, name, directory)
if loggerErr != nil {
return &StateRegisterError{Err: loggerErr}
}
// Initialize the FSM
state.FSM.Init(name, stateCallback, &state.Logger, directory, debug)
state.Debug = debug
// Initialize the Config
state.Config.Init(name, directory)
// Initialize Discovery
state.Discovery.Init(&state.FSM, &state.Logger)
// Try to load the previous configuration
if state.Config.Load(&state) != nil {
// This error can be safely ignored, as when the config does not load, the struct will not be filled
state.Logger.Log(internal.LOG_INFO, "Previous configuration not found")
}
state.FSM.GoTransition(internal.NO_SERVER)
return nil
}
func (state *VPNState) Deregister() error {
// Close the log file
state.Logger.Close()
// Save the config
state.Config.Save(&state)
// Empty out the state
*state = VPNState{}
return nil
}
func (state *VPNState) CancelOAuth() error {
if !state.FSM.InState(internal.OAUTH_STARTED) {
return &StateWrongFSMStateError{Got: state.FSM.Current, Want: internal.OAUTH_STARTED}
}
server, serverErr := state.Servers.GetCurrentServer()
if serverErr != nil {
return &StateOAuthCancelError{Err: serverErr}
}
internal.CancelOAuth(server)
return nil
}
func (state *VPNState) chooseServer(url string, isSecureInternet bool) (internal.Server, error) {
// New server chosen, ensure the server is fresh
server, serverErr := state.Servers.EnsureServer(url, isSecureInternet, &state.FSM, &state.Logger)
if serverErr != nil {
return nil, serverErr
}
// Make sure we are in the chosen state if available
state.FSM.GoTransition(internal.CHOSEN_SERVER)
return server, nil
}
func (state *VPNState) getConfigWithOptions(url string, isSecureInternet bool, forceTCP bool) (string, string, error) {
if state.FSM.InState(internal.DEREGISTERED) {
return "", "", &StateFSMNotRegisteredError{}
}
// Go to no server if possible, else return an error
if !state.FSM.InState(internal.NO_SERVER) && !state.FSM.GoTransition(internal.NO_SERVER) {
return "", "", &internal.FSMWrongStateTransitionError{Got: state.FSM.Current, Want: internal.NO_SERVER}
}
// Make sure the server is chosen
server, serverErr := state.chooseServer(url, isSecureInternet)
if serverErr != nil {
return "", "", &StateConnectError{URL: url, IsSecureInternet: isSecureInternet, Err: serverErr}
}
// Relogin with oauth
// This moves the state to authorized
if internal.NeedsRelogin(server) {
loginErr := internal.Login(server)
if loginErr != nil {
// We are possibly in oauth started
// So go to no server
state.FSM.GoTransition(internal.NO_SERVER)
return "", "", &StateConnectError{URL: url, IsSecureInternet: isSecureInternet, Err: loginErr}
}
} else { // OAuth was valid, ensure we are in the authorized state
state.FSM.GoTransition(internal.AUTHORIZED)
}
state.FSM.GoTransition(internal.REQUEST_CONFIG)
config, configType, configErr := internal.GetConfig(server, forceTCP)
if configErr != nil {
// Go back to no server if possible
state.FSM.GoTransition(internal.NO_SERVER)
return "", "", &StateConnectError{URL: url, IsSecureInternet: isSecureInternet, Err: configErr}
} else {
state.FSM.GoTransition(internal.HAS_CONFIG)
}
return config, configType, nil
}
func (state *VPNState) GetConfigInstituteAccess(url string, forceTCP bool) (string, string, error) {
return state.getConfigWithOptions(url, false, forceTCP)
}
func (state *VPNState) GetConfigSecureInternet(url string, forceTCP bool) (string, string, error) {
return state.getConfigWithOptions(url, true, forceTCP)
}
func (state *VPNState) GetDiscoOrganizations() (string, error) {
if state.FSM.InState(internal.DEREGISTERED) {
return "", &StateWrongFSMStateError{Got: state.FSM.Current, Want: internal.DEREGISTERED}
}
return state.Discovery.GetOrganizationsList()
}
func (state *VPNState) GetDiscoServers() (string, error) {
if state.FSM.InState(internal.DEREGISTERED) {
return "", &StateFSMNotRegisteredError{}
}
return state.Discovery.GetServersList()
}
func (state *VPNState) SetProfileID(profileID string) error {
if !state.FSM.InState(internal.ASK_PROFILE) {
return &StateWrongFSMStateError{Got: state.FSM.Current, Want: internal.ASK_PROFILE}
}
server, serverErr := state.Servers.GetCurrentServer()
if serverErr != nil {
return &StateSetProfileError{ProfileID: profileID, Err: serverErr}
}
base, baseErr := server.GetBase()
if baseErr != nil {
return &StateSetProfileError{ProfileID: profileID, Err: baseErr}
}
base.Profiles.Current = profileID
return nil
}
func (state *VPNState) SetConnected() error {
if !state.FSM.HasTransition(internal.CONNECTED) {
return &internal.FSMWrongStateTransitionError{Got: state.FSM.Current, Want: internal.CONNECTED}
}
state.FSM.GoTransition(internal.CONNECTED)
return nil
}
func (state *VPNState) SetDisconnected() error {
if !state.FSM.HasTransition(internal.HAS_CONFIG) {
return &internal.FSMWrongStateTransitionError{Got: state.FSM.Current, Want: internal.HAS_CONFIG}
}
state.FSM.GoTransition(internal.HAS_CONFIG)
return nil
}
type StateSetProfileError struct {
ProfileID string
Err error
}
func (e *StateSetProfileError) Error() string {
return fmt.Sprintf("failed to set profile ID: %s with error: %v", e.ProfileID, e.Err)
}
type StateRegisterError struct {
Err error
}
func (e *StateRegisterError) Error() string {
return fmt.Sprintf("failed to register with error: %v", e.Err)
}
type StateFSMNotRegisteredError struct{}
func (e *StateFSMNotRegisteredError) Error() string {
return fmt.Sprintf("state is not registered. Current FSM state: %s", internal.DEREGISTERED.String())
}
type StateWrongFSMStateError struct {
Got internal.FSMStateID
Want internal.FSMStateID
}
func (e *StateWrongFSMStateError) Error() string {
return fmt.Sprintf("wrong FSM state, got: %s, want: %s", e.Got.String(), e.Want.String())
}
type StateOAuthCancelError struct {
Err error
}
func (e *StateOAuthCancelError) Error() string {
return fmt.Sprintf("failed cancelling OAuth for state with error: %v", e.Err)
}
type StateConnectError struct {
URL string
IsSecureInternet bool
Err error
}
func (e *StateConnectError) Error() string {
return fmt.Sprintf("failed connecting to server: %s (is secure internet: %v) with error: %v", e.URL, e.IsSecureInternet, e.Err)
}
|
