forked from hashicorp/vault
-
Notifications
You must be signed in to change notification settings - Fork 0
/
request_handling.go
601 lines (529 loc) · 19.1 KB
/
request_handling.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
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
package vault
import (
"context"
"fmt"
"strings"
"time"
"github.com/armon/go-metrics"
"github.com/hashicorp/go-multierror"
"github.com/hashicorp/vault/audit"
"github.com/hashicorp/vault/helper/consts"
"github.com/hashicorp/vault/helper/identity"
"github.com/hashicorp/vault/helper/jsonutil"
"github.com/hashicorp/vault/helper/policyutil"
"github.com/hashicorp/vault/helper/strutil"
"github.com/hashicorp/vault/helper/wrapping"
"github.com/hashicorp/vault/logical"
"github.com/hashicorp/vault/logical/framework"
)
const (
replTimeout = 10 * time.Second
)
// HandleRequest is used to handle a new incoming request
func (c *Core) HandleRequest(req *logical.Request) (resp *logical.Response, err error) {
c.stateLock.RLock()
defer c.stateLock.RUnlock()
if c.sealed {
return nil, consts.ErrSealed
}
if c.standby {
return nil, consts.ErrStandby
}
ctx, cancel := context.WithCancel(c.activeContext)
defer cancel()
// Allowing writing to a path ending in / makes it extremely difficult to
// understand user intent for the filesystem-like backends (kv,
// cubbyhole) -- did they want a key named foo/ or did they want to write
// to a directory foo/ with no (or forgotten) key, or...? It also affects
// lookup, because paths ending in / are considered prefixes by some
// backends. Basically, it's all just terrible, so don't allow it.
if strings.HasSuffix(req.Path, "/") &&
(req.Operation == logical.UpdateOperation ||
req.Operation == logical.CreateOperation) {
return logical.ErrorResponse("cannot write to a path ending in '/'"), nil
}
var auth *logical.Auth
if c.router.LoginPath(req.Path) {
resp, auth, err = c.handleLoginRequest(ctx, req)
} else {
resp, auth, err = c.handleRequest(ctx, req)
}
// Ensure we don't leak internal data
if resp != nil {
if resp.Secret != nil {
resp.Secret.InternalData = nil
}
if resp.Auth != nil {
resp.Auth.InternalData = nil
}
}
// We are wrapping if there is anything to wrap (not a nil response) and a
// TTL was specified for the token. Errors on a call should be returned to
// the caller, so wrapping is turned off if an error is hit and the error
// is logged to the audit log.
wrapping := resp != nil &&
err == nil &&
!resp.IsError() &&
resp.WrapInfo != nil &&
resp.WrapInfo.TTL != 0 &&
resp.WrapInfo.Token == ""
if wrapping {
cubbyResp, cubbyErr := c.wrapInCubbyhole(ctx, req, resp, auth)
// If not successful, returns either an error response from the
// cubbyhole backend or an error; if either is set, set resp and err to
// those and continue so that that's what we audit log. Otherwise
// finish the wrapping and audit log that.
if cubbyResp != nil || cubbyErr != nil {
resp = cubbyResp
err = cubbyErr
} else {
wrappingResp := &logical.Response{
WrapInfo: resp.WrapInfo,
Warnings: resp.Warnings,
}
resp = wrappingResp
}
}
auditResp := resp
// When unwrapping we want to log the actual response that will be written
// out. We still want to return the raw value to avoid automatic updating
// to any of it.
if req.Path == "sys/wrapping/unwrap" &&
resp != nil &&
resp.Data != nil &&
resp.Data[logical.HTTPRawBody] != nil {
// Decode the JSON
httpResp := &logical.HTTPResponse{}
err := jsonutil.DecodeJSON(resp.Data[logical.HTTPRawBody].([]byte), httpResp)
if err != nil {
c.logger.Error("failed to unmarshal wrapped HTTP response for audit logging", "error", err)
return nil, ErrInternalError
}
auditResp = logical.HTTPResponseToLogicalResponse(httpResp)
}
var nonHMACReqDataKeys []string
var nonHMACRespDataKeys []string
entry := c.router.MatchingMountEntry(req.Path)
if entry != nil {
// Get and set ignored HMAC'd value. Reset those back to empty afterwards.
if rawVals, ok := entry.synthesizedConfigCache.Load("audit_non_hmac_request_keys"); ok {
nonHMACReqDataKeys = rawVals.([]string)
}
// Get and set ignored HMAC'd value. Reset those back to empty afterwards.
if auditResp != nil {
if rawVals, ok := entry.synthesizedConfigCache.Load("audit_non_hmac_response_keys"); ok {
nonHMACRespDataKeys = rawVals.([]string)
}
}
}
// Create an audit trail of the response
logInput := &audit.LogInput{
Auth: auth,
Request: req,
Response: auditResp,
OuterErr: err,
NonHMACReqDataKeys: nonHMACReqDataKeys,
NonHMACRespDataKeys: nonHMACRespDataKeys,
}
if auditErr := c.auditBroker.LogResponse(ctx, logInput, c.auditedHeaders); auditErr != nil {
c.logger.Error("failed to audit response", "request_path", req.Path, "error", auditErr)
return nil, ErrInternalError
}
return
}
func (c *Core) handleRequest(ctx context.Context, req *logical.Request) (retResp *logical.Response, retAuth *logical.Auth, retErr error) {
defer metrics.MeasureSince([]string{"core", "handle_request"}, time.Now())
var nonHMACReqDataKeys []string
entry := c.router.MatchingMountEntry(req.Path)
if entry != nil {
// Get and set ignored HMAC'd value.
if rawVals, ok := entry.synthesizedConfigCache.Load("audit_non_hmac_request_keys"); ok {
nonHMACReqDataKeys = rawVals.([]string)
}
}
// Validate the token
auth, te, ctErr := c.checkToken(ctx, req, false)
// We run this logic first because we want to decrement the use count even in the case of an error
if te != nil {
// Attempt to use the token (decrement NumUses)
var err error
te, err = c.tokenStore.UseToken(ctx, te)
if err != nil {
c.logger.Error("failed to use token", "error", err)
retErr = multierror.Append(retErr, ErrInternalError)
return nil, nil, retErr
}
if te == nil {
// Token has been revoked by this point
retErr = multierror.Append(retErr, logical.ErrPermissionDenied)
return nil, nil, retErr
}
if te.NumUses == -1 {
// We defer a revocation until after logic has run, since this is a
// valid request (this is the token's final use). We pass the ID in
// directly just to be safe in case something else modifies te later.
defer func(id string) {
err = c.tokenStore.Revoke(ctx, id)
if err != nil {
c.logger.Error("failed to revoke token", "error", err)
retResp = nil
retAuth = nil
retErr = multierror.Append(retErr, ErrInternalError)
}
if retResp != nil && retResp.Secret != nil &&
// Some backends return a TTL even without a Lease ID
retResp.Secret.LeaseID != "" {
retResp = logical.ErrorResponse("Secret cannot be returned; token had one use left, so leased credentials were immediately revoked.")
return
}
}(te.ID)
}
}
if ctErr != nil {
// If it is an internal error we return that, otherwise we
// return invalid request so that the status codes can be correct
errType := logical.ErrInvalidRequest
switch ctErr {
case ErrInternalError, logical.ErrPermissionDenied:
errType = ctErr
}
logInput := &audit.LogInput{
Auth: auth,
Request: req,
OuterErr: ctErr,
NonHMACReqDataKeys: nonHMACReqDataKeys,
}
if err := c.auditBroker.LogRequest(ctx, logInput, c.auditedHeaders); err != nil {
c.logger.Error("failed to audit request", "path", req.Path, "error", err)
}
if errType != nil {
retErr = multierror.Append(retErr, errType)
}
if ctErr == ErrInternalError {
return nil, auth, retErr
}
return logical.ErrorResponse(ctErr.Error()), auth, retErr
}
// Attach the display name
req.DisplayName = auth.DisplayName
// Create an audit trail of the request
logInput := &audit.LogInput{
Auth: auth,
Request: req,
NonHMACReqDataKeys: nonHMACReqDataKeys,
}
if err := c.auditBroker.LogRequest(ctx, logInput, c.auditedHeaders); err != nil {
c.logger.Error("failed to audit request", "path", req.Path, "error", err)
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
// Route the request
resp, routeErr := c.router.Route(ctx, req)
if resp != nil {
// If wrapping is used, use the shortest between the request and response
var wrapTTL time.Duration
var wrapFormat, creationPath string
var sealWrap bool
// Ensure no wrap info information is set other than, possibly, the TTL
if resp.WrapInfo != nil {
if resp.WrapInfo.TTL > 0 {
wrapTTL = resp.WrapInfo.TTL
}
wrapFormat = resp.WrapInfo.Format
creationPath = resp.WrapInfo.CreationPath
sealWrap = resp.WrapInfo.SealWrap
resp.WrapInfo = nil
}
if req.WrapInfo != nil {
if req.WrapInfo.TTL > 0 {
switch {
case wrapTTL == 0:
wrapTTL = req.WrapInfo.TTL
case req.WrapInfo.TTL < wrapTTL:
wrapTTL = req.WrapInfo.TTL
}
}
// If the wrap format hasn't been set by the response, set it to
// the request format
if req.WrapInfo.Format != "" && wrapFormat == "" {
wrapFormat = req.WrapInfo.Format
}
}
if wrapTTL > 0 {
resp.WrapInfo = &wrapping.ResponseWrapInfo{
TTL: wrapTTL,
Format: wrapFormat,
CreationPath: creationPath,
SealWrap: sealWrap,
}
}
}
// If there is a secret, we must register it with the expiration manager.
// We exclude renewal of a lease, since it does not need to be re-registered
if resp != nil && resp.Secret != nil && !strings.HasPrefix(req.Path, "sys/renew") &&
!strings.HasPrefix(req.Path, "sys/leases/renew") {
// KV mounts should return the TTL but not register
// for a lease as this provides a massive slowdown
registerLease := true
matchingMountEntry := c.router.MatchingMountEntry(req.Path)
if matchingMountEntry == nil {
c.logger.Error("unable to retrieve kv mount entry from router")
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
switch matchingMountEntry.Type {
case "kv", "generic":
// If we are kv type, first see if we are an older passthrough
// backend, and otherwise check the mount entry options.
matchingBackend := c.router.MatchingBackend(req.Path)
if matchingBackend == nil {
c.logger.Error("unable to retrieve kv backend from router")
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
if ptbe, ok := matchingBackend.(*PassthroughBackend); ok {
if !ptbe.GeneratesLeases() {
registerLease = false
resp.Secret.Renewable = false
}
} else if matchingMountEntry.Options == nil || matchingMountEntry.Options["leased_passthrough"] != "true" {
registerLease = false
resp.Secret.Renewable = false
}
case "plugin":
// If we are a plugin type and the plugin name is "kv" check the
// mount entry options.
if matchingMountEntry.Config.PluginName == "kv" && (matchingMountEntry.Options == nil || matchingMountEntry.Options["leased_passthrough"] != "true") {
registerLease = false
resp.Secret.Renewable = false
}
}
if registerLease {
sysView := c.router.MatchingSystemView(req.Path)
if sysView == nil {
c.logger.Error("unable to look up sys view for login path", "request_path", req.Path)
return nil, nil, ErrInternalError
}
ttl, warnings, err := framework.CalculateTTL(sysView, 0, resp.Secret.TTL, 0, resp.Secret.MaxTTL, 0, time.Time{})
if err != nil {
return nil, nil, err
}
for _, warning := range warnings {
resp.AddWarning(warning)
}
resp.Secret.TTL = ttl
leaseID, err := c.expiration.Register(req, resp)
if err != nil {
c.logger.Error("failed to register lease", "request_path", req.Path, "error", err)
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
resp.Secret.LeaseID = leaseID
}
}
// If the request was to renew a token, and if there are group aliases set
// in the auth object, then the group memberships should be refreshed
if strings.HasPrefix(req.Path, "auth/token/renew") &&
resp != nil &&
resp.Auth != nil &&
resp.Auth.EntityID != "" &&
resp.Auth.GroupAliases != nil {
err := c.identityStore.refreshExternalGroupMembershipsByEntityID(resp.Auth.EntityID, resp.Auth.GroupAliases)
if err != nil {
c.logger.Error("failed to refresh external group memberships", "error", err)
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
}
// Only the token store is allowed to return an auth block, for any
// other request this is an internal error. We exclude renewal of a token,
// since it does not need to be re-registered
if resp != nil && resp.Auth != nil && !strings.HasPrefix(req.Path, "auth/token/renew") {
if !strings.HasPrefix(req.Path, "auth/token/") {
c.logger.Error("unexpected Auth response for non-token backend", "request_path", req.Path)
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
// Register with the expiration manager. We use the token's actual path
// here because roles allow suffixes.
te, err := c.tokenStore.Lookup(ctx, resp.Auth.ClientToken)
if err != nil {
c.logger.Error("failed to look up token", "error", err)
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
if err := c.expiration.RegisterAuth(te.Path, resp.Auth); err != nil {
c.tokenStore.Revoke(ctx, te.ID)
c.logger.Error("failed to register token lease", "request_path", req.Path, "error", err)
retErr = multierror.Append(retErr, ErrInternalError)
return nil, auth, retErr
}
}
if resp != nil &&
req.Path == "cubbyhole/response" &&
len(te.Policies) == 1 &&
te.Policies[0] == responseWrappingPolicyName {
resp.AddWarning("Reading from 'cubbyhole/response' is deprecated. Please use sys/wrapping/unwrap to unwrap responses, as it provides additional security checks and other benefits.")
}
// Return the response and error
if routeErr != nil {
retErr = multierror.Append(retErr, routeErr)
}
return resp, auth, retErr
}
// handleLoginRequest is used to handle a login request, which is an
// unauthenticated request to the backend.
func (c *Core) handleLoginRequest(ctx context.Context, req *logical.Request) (retResp *logical.Response, retAuth *logical.Auth, retErr error) {
defer metrics.MeasureSince([]string{"core", "handle_login_request"}, time.Now())
req.Unauthenticated = true
var auth *logical.Auth
// Create an audit trail of the request, auth is not available on login requests
// Create an audit trail of the request. Attach auth if it was returned,
// e.g. if a token was provided.
logInput := &audit.LogInput{
Auth: auth,
Request: req,
}
if err := c.auditBroker.LogRequest(ctx, logInput, c.auditedHeaders); err != nil {
c.logger.Error("failed to audit request", "path", req.Path, "error", err)
return nil, nil, ErrInternalError
}
// The token store uses authentication even when creating a new token,
// so it's handled in handleRequest. It should not be reached here.
if strings.HasPrefix(req.Path, "auth/token/") {
c.logger.Error("unexpected login request for token backend", "request_path", req.Path)
return nil, nil, ErrInternalError
}
// Route the request
resp, routeErr := c.router.Route(ctx, req)
if resp != nil {
// If wrapping is used, use the shortest between the request and response
var wrapTTL time.Duration
var wrapFormat, creationPath string
var sealWrap bool
// Ensure no wrap info information is set other than, possibly, the TTL
if resp.WrapInfo != nil {
if resp.WrapInfo.TTL > 0 {
wrapTTL = resp.WrapInfo.TTL
}
wrapFormat = resp.WrapInfo.Format
creationPath = resp.WrapInfo.CreationPath
sealWrap = resp.WrapInfo.SealWrap
resp.WrapInfo = nil
}
if req.WrapInfo != nil {
if req.WrapInfo.TTL > 0 {
switch {
case wrapTTL == 0:
wrapTTL = req.WrapInfo.TTL
case req.WrapInfo.TTL < wrapTTL:
wrapTTL = req.WrapInfo.TTL
}
}
if req.WrapInfo.Format != "" && wrapFormat == "" {
wrapFormat = req.WrapInfo.Format
}
}
if wrapTTL > 0 {
resp.WrapInfo = &wrapping.ResponseWrapInfo{
TTL: wrapTTL,
Format: wrapFormat,
CreationPath: creationPath,
SealWrap: sealWrap,
}
}
}
// A login request should never return a secret!
if resp != nil && resp.Secret != nil {
c.logger.Error("unexpected Secret response for login path", "request_path", req.Path)
return nil, nil, ErrInternalError
}
// If the response generated an authentication, then generate the token
if resp != nil && resp.Auth != nil {
var entity *identity.Entity
auth = resp.Auth
if auth.Alias != nil {
// Overwrite the mount type and mount path in the alias
// information
auth.Alias.MountType = req.MountType
auth.Alias.MountAccessor = req.MountAccessor
if auth.Alias.Name == "" {
return nil, nil, fmt.Errorf("missing name in alias")
}
var err error
// Fetch the entity for the alias, or create an entity if one
// doesn't exist.
entity, err = c.identityStore.CreateOrFetchEntity(auth.Alias)
if err != nil {
return nil, nil, err
}
if entity == nil {
return nil, nil, fmt.Errorf("failed to create an entity for the authenticated alias")
}
auth.EntityID = entity.ID
if auth.GroupAliases != nil {
err = c.identityStore.refreshExternalGroupMembershipsByEntityID(auth.EntityID, auth.GroupAliases)
if err != nil {
return nil, nil, err
}
}
}
if strutil.StrListSubset(auth.Policies, []string{"root"}) {
return logical.ErrorResponse("auth methods cannot create root tokens"), nil, logical.ErrInvalidRequest
}
// Determine the source of the login
source := c.router.MatchingMount(req.Path)
source = strings.TrimPrefix(source, credentialRoutePrefix)
source = strings.Replace(source, "/", "-", -1)
// Prepend the source to the display name
auth.DisplayName = strings.TrimSuffix(source+auth.DisplayName, "-")
sysView := c.router.MatchingSystemView(req.Path)
if sysView == nil {
c.logger.Error("unable to look up sys view for login path", "request_path", req.Path)
return nil, nil, ErrInternalError
}
tokenTTL, warnings, err := framework.CalculateTTL(sysView, 0, auth.TTL, auth.Period, auth.MaxTTL, auth.ExplicitMaxTTL, time.Time{})
if err != nil {
return nil, nil, err
}
for _, warning := range warnings {
resp.AddWarning(warning)
}
// Generate a token
te := TokenEntry{
Path: req.Path,
Policies: auth.Policies,
Meta: auth.Metadata,
DisplayName: auth.DisplayName,
CreationTime: time.Now().Unix(),
TTL: tokenTTL,
NumUses: auth.NumUses,
EntityID: auth.EntityID,
}
te.Policies = policyutil.SanitizePolicies(te.Policies, true)
// Prevent internal policies from being assigned to tokens
for _, policy := range te.Policies {
if strutil.StrListContains(nonAssignablePolicies, policy) {
return logical.ErrorResponse(fmt.Sprintf("cannot assign policy %q", policy)), nil, logical.ErrInvalidRequest
}
}
if err := c.tokenStore.create(ctx, &te); err != nil {
c.logger.Error("failed to create token", "error", err)
return nil, auth, ErrInternalError
}
// Populate the client token, accessor, and TTL
auth.ClientToken = te.ID
auth.Accessor = te.Accessor
auth.Policies = te.Policies
auth.TTL = te.TTL
// Register with the expiration manager
if err := c.expiration.RegisterAuth(te.Path, auth); err != nil {
c.tokenStore.Revoke(ctx, te.ID)
c.logger.Error("failed to register token lease", "request_path", req.Path, "error", err)
return nil, auth, ErrInternalError
}
// Attach the display name, might be used by audit backends
req.DisplayName = auth.DisplayName
}
return resp, auth, routeErr
}