/
client_autokx.go
267 lines (236 loc) · 7.77 KB
/
client_autokx.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
254
255
256
257
258
259
260
261
262
263
264
265
266
267
package client
import (
"errors"
"fmt"
"time"
"github.com/companyzero/bisonrelay/client/clientdb"
"github.com/companyzero/bisonrelay/rpc"
"github.com/companyzero/bisonrelay/zkidentity"
)
// Autokx flow (where Alice is asking Bob for an invite to Charlie):
//
// Alice Bob Charlie
// ------- ----- ---------
//
// RequestMediateIdentity()
// \--- RMMediateIdentity -->
//
// handleMediateID()
// \------- RMInvite -->
//
// handleRMInvite()
// <-- RMTransitiveMessage -----/
// [RMPublicIdentityInvite]
// guestList.runInvite()
//
//
// handleTransitiveMsg()
// <-- RMTransitiveMessageFwd -----/
// [RMPublicIdentityInvite]
//
// handleTransitiveMsgFwd()
// handleTransitiveIDInvite()
// hostList.runInvite()
//
// (rest of flow is similar to standard kx)
// RequestMediateIdentity attempts to start a kx process with target by asking
// mediator for an introduction.
func (c *Client) RequestMediateIdentity(mediator, target UserID) error {
mu, err := c.rul.byID(mediator)
if err != nil {
return fmt.Errorf("cannot request mediate identity: no session "+
"with mediator %s: %v", mediator, err)
}
_, err = c.rul.byID(target)
if !errors.Is(err, userNotFoundError{}) {
if err == nil {
return fmt.Errorf("cannot request mediate identity: already have"+
"session with target %s", target)
}
return fmt.Errorf("unexpected error fetching user: %v", err)
}
// Track that we requested this mediate ID request.
err = c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
return c.db.StoreMediateIDRequested(tx, mediator, target)
})
if err != nil {
return err
}
mu.log.Infof("Asking to mediate identity to target %s", target)
mi := rpc.RMMediateIdentity{Identity: target}
payEvent := fmt.Sprintf("mediateid.%s", target)
return c.sendWithSendQ(payEvent, mi, mediator)
}
// maybeRequestMediateID checks if there are outstanding KX or transitive KX
// attempts for the given target, and if there aren't, starts one using the
// specified mediator.
func (c *Client) maybeRequestMediateID(mediator, target UserID) error {
// Fast check if user exists.
_, err := c.rul.byID(target)
if err == nil {
// User exists.
return nil
}
if !errors.Is(err, userNotFoundError{}) {
return fmt.Errorf("unexpected error fetching user: %v", err)
}
// Fast check if mediator exists.
mu, err := c.rul.byID(mediator)
if err != nil {
return fmt.Errorf("cannot request mediate identity: no session "+
"with mediator %s: %v", mediator, err)
}
// User does not exist. Check for outstanding KX/MI requests.
errIgnore := errors.New("ignore")
err = c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
kxs, err := c.db.HasKXWithUser(tx, target)
if err != nil {
return err
}
if len(kxs) > 0 {
return errIgnore
}
hasRecent, err := c.db.HasAnyRecentMediateID(tx, target,
c.cfg.RecentMediateIDThreshold)
if err != nil {
return err
}
if hasRecent {
return errIgnore
}
// Store total nb of MI requests.
unkx, err := c.db.ReadUnxkdUserInfo(tx, target)
if err != nil {
if !errors.Is(err, clientdb.ErrNotFound) {
return err
}
unkx.UID = target
}
unkx.MIRequests += 1
if err := c.db.StoreUnkxdUserInfo(tx, unkx); err != nil {
return err
}
// Will attempt mediate ID. Store attempt.
return c.db.StoreMediateIDRequested(tx, mediator, target)
})
if errors.Is(err, errIgnore) {
// Ignore request to attempt MI.
return nil
}
if err != nil {
return err
}
mu.log.Infof("Asking to mediate identity to target %s", target)
mi := rpc.RMMediateIdentity{Identity: target}
payEvent := fmt.Sprintf("mediateid.%s", target)
return c.sendWithSendQ(payEvent, mi, mediator)
}
func (c *Client) handleMediateID(ru *RemoteUser, mi rpc.RMMediateIdentity) error {
if c.cfg.TransitiveEvent != nil {
c.cfg.TransitiveEvent(ru.ID(), mi.Identity, TEMediateID)
}
target, err := c.rul.byID(mi.Identity)
if err != nil {
ru.log.Warnf("Asked to mediate id to unknown user %s",
zkidentity.ShortID(mi.Identity))
return err
}
ru.log.Infof("Asked to mediate id to %s", target)
// Ask target to generate an identity invite.
rm := rpc.RMInvite{Invitee: ru.PublicIdentity()}
payEvent := fmt.Sprintf("mediateid.%s", ru.ID())
return target.sendRM(rm, payEvent)
}
func (c *Client) handleRMInvite(ru *RemoteUser, iv rpc.RMInvite) error {
ru.log.Infof("Requested invite on behalf of %s (%q)", iv.Invitee.Identity,
iv.Invitee.Nick)
if c.cfg.TransitiveEvent != nil {
c.cfg.TransitiveEvent(ru.ID(), iv.Invitee.Identity, TERequestInvite)
}
// Generate an invite.
mediatorID := ru.ID()
pii, err := c.kxl.createInvite(nil, &iv.Invitee, &mediatorID, false, nil)
if err != nil {
return err
}
return ru.sendTransitive(pii, "RMInvite", iv.Invitee, priorityDefault)
}
func (c *Client) handleTransitiveIDInvite(ru *RemoteUser, pii rpc.OOBPublicIdentityInvite) error {
// Double check we actually requested this invitation.
errNoMI := errors.New("no mi")
err := c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
_, err := c.db.HasMediateID(tx, ru.ID(), pii.Public.Identity)
if errors.Is(err, clientdb.ErrNotFound) {
return errNoMI
}
return err
})
if errors.Is(err, errNoMI) {
// This happens legitimately when the local client sends
// multiple MI requests and the first one completes (thus
// removing other requests from the DB). So just log instead of
// error.
ru.log.Warnf("Received unrequested transitive ID invite from %s"+
"by way of %s", pii.Public.Identity, ru.ID())
return nil
}
if err != nil {
return err
}
if !pii.Public.VerifyIdentity() {
return fmt.Errorf("received pii with key different then expected by identity")
}
ru.log.Infof("Accepting transitive invite from %s (%q)", pii.Public.Identity,
pii.Public.Nick)
if c.cfg.TransitiveEvent != nil {
c.cfg.TransitiveEvent(ru.ID(), pii.Public.Identity, TEReceivedInvite)
}
err = c.kxl.acceptInvite(pii, false, true)
if errors.Is(err, errUserBlocked) {
ru.log.Infof("Canceled invite from blocked identity %s (%q)", pii.Public.Identity,
pii.Public.Nick)
return nil
} else if errKX := new(errHasOngoingKX); errors.As(err, errKX) {
ru.log.Infof("Skipping accepting invite for kx %s from %s (%q) due to "+
"already ongoing kx (RV %s)", pii.InitialRendezvous,
pii.Public.Identity, pii.Public.Nick, errKX.otherRV)
} else if err != nil {
return err
}
// Everything ok, remove this mediate id request.
return c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
return c.db.RemoveMediateID(tx, ru.ID(), pii.Public.Identity)
})
}
// ListMediateIDs lists mediate id requests made by the local client.
func (c *Client) ListMediateIDs() ([]clientdb.MediateIDRequest, error) {
var res []clientdb.MediateIDRequest
err := c.dbView(func(tx clientdb.ReadTx) error {
var err error
res, err = c.db.ListMediateIDs(tx)
return err
})
return res, err
}
// clearOldMediateIDs removes all mediate id requests that were requested over 7
// days ago.
func (c *Client) clearOldMediateIDs(miExpiryDuration time.Duration) error {
limitDate := time.Now().Add(-miExpiryDuration)
return c.dbUpdate(func(tx clientdb.ReadWriteTx) error {
mis, err := c.db.ListMediateIDs(tx)
if err != nil {
return err
}
for _, mi := range mis {
if !mi.Date.Before(limitDate) {
continue
}
err := c.db.RemoveMediateID(tx, mi.Mediator, mi.Target)
if err != nil {
c.log.Warnf("Unable to remove mediate id to %s "+
"via %s: %v", mi.Target, mi.Mediator, err)
}
}
return nil
})
}