-
Notifications
You must be signed in to change notification settings - Fork 74
/
security.c
1406 lines (1238 loc) · 52 KB
/
security.c
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
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
* Copyright (c) 2012 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
#include <asl.h>
#include <IOKit/kext/OSKext.h>
#include <IOKit/kext/OSKextPrivate.h>
#include <IOKit/IOKitLib.h>
#include <Security/Security.h>
#include "security.h"
#include "kext_tools_util.h"
/*******************************************************************************
* Helper functions
*******************************************************************************/
static OSStatus checkRootCertificateIsApple(OSKextRef aKext);
static CFStringRef copyCDHash(SecStaticCodeRef code);
static CFStringRef copyIssuerCN(SecCertificateRef certificate);
static void copySigningInfo(CFURLRef kextURL,
CFStringRef* cdhash,
CFStringRef* teamId,
CFStringRef* subjectCN,
CFStringRef* issuerCN);
static CFArrayRef copySubjectCNArray(CFURLRef kextURL);
static CFStringRef copyTeamID(SecCertificateRef certificate);
static CFStringRef createArchitectureList(OSKextRef aKext, CFBooleanRef *isFat);
static void createHashForMT(CFURLRef kextURL, char ** signatureBuffer);
static void filterKextLoadForMT(OSKextRef aKext, CFMutableArrayRef *kextList);
/*******************************************************************************
* messageTraceExcludedKext() - log MessageTracer message for kexts in
* exclude list.
* <rdar://problem/12994418> MessageTrace when we block the load of something
* on the kext exclude list
*******************************************************************************/
void messageTraceExcludedKext(OSKextRef theKext)
{
CFStringRef versionString;
CFStringRef bundleIDString;
CFURLRef kextURL = NULL; // must release
CFStringRef filename = NULL; // must release
aslmsg amsg = NULL; // must free
char *versionCString = NULL; // must free
char *bundleIDCString = NULL; // must free
char *filenameCString = NULL; // must free
kextURL = CFURLCopyAbsoluteURL(OSKextGetURL(theKext));
if (!kextURL) {
OSKextLogMemError();
goto finish;
}
versionString = OSKextGetValueForInfoDictionaryKey(theKext,
kCFBundleVersionKey);
if (versionString) {
versionCString = createUTF8CStringForCFString(versionString);
}
bundleIDString = OSKextGetValueForInfoDictionaryKey(theKext,
kCFBundleIdentifierKey);
if (bundleIDString) {
bundleIDCString = createUTF8CStringForCFString(bundleIDString);
}
filename = CFURLCopyLastPathComponent(kextURL);
if (filename) {
filenameCString = createUTF8CStringForCFString(filename);
}
SAFE_RELEASE(filename);
/* log the message tracer data
*/
amsg = asl_new(ASL_TYPE_MSG);
if (!amsg) {
OSKextLogMemError();
goto finish;
}
asl_set(amsg, kMessageTracerDomainKey, kMTKextBlockedDomain);
asl_set(amsg, kMessageTracerBundleIDKey,
bundleIDCString ? bundleIDCString : "");
asl_set(amsg, kMessageTracerVersionKey,
versionCString ? versionCString : "");
asl_set(amsg, kMessageTracerKextNameKey,
filenameCString ? filenameCString : "");
asl_log(NULL, amsg, ASL_LEVEL_NOTICE, "");
finish:
SAFE_FREE(versionCString);
SAFE_FREE(bundleIDCString);
SAFE_FREE(filenameCString);
SAFE_RELEASE(kextURL);
if (amsg) {
asl_free(amsg);
}
return;
}
/*******************************************************************************
* checkRootCertificateIsApple() - check if the root certificate of the kext
* is issued by Apple
* <rdar://problem/12435992> Message tracing for kext loads
*******************************************************************************/
static OSStatus checkRootCertificateIsApple(OSKextRef aKext)
{
OSStatus result = -1;
CFURLRef kextURL = NULL; // must release
SecStaticCodeRef staticCodeRef = NULL; // must release
SecRequirementRef requirementRef = NULL; // must release
CFStringRef myCFString;
CFStringRef requirementsString;
if (aKext == NULL) {
return result;
}
kextURL = CFURLCopyAbsoluteURL(OSKextGetURL(aKext));
if (!kextURL) {
OSKextLogMemError();
goto finish;
}
if (SecStaticCodeCreateWithPath(kextURL,
kSecCSDefaultFlags,
&staticCodeRef) != errSecSuccess ||
(staticCodeRef == NULL)) {
OSKextLogMemError();
goto finish;
}
/* set up correct requirement string */
myCFString = OSKextGetIdentifier(aKext);
if (CFStringHasPrefix(myCFString, __kOSKextApplePrefix)) {
requirementsString = CFSTR("anchor apple");
}
else {
requirementsString = CFSTR("anchor apple generic");
}
if (SecRequirementCreateWithString(requirementsString,
kSecCSDefaultFlags,
&requirementRef) != errSecSuccess ||
(requirementRef == NULL)) {
OSKextLogMemError();
goto finish;
}
// errSecCSUnsigned == -67062
result = SecStaticCodeCheckValidity(staticCodeRef,
kSecCSDefaultFlags,
requirementRef);
if (result != 0) {
OSKextLogCFString(NULL,
kOSKextLogErrorLevel | kOSKextLogLoadFlag,
CFSTR("Invalid signature %ld for kext %@"),
(long)result, aKext);
}
finish:
SAFE_RELEASE(kextURL);
SAFE_RELEASE(staticCodeRef);
SAFE_RELEASE(requirementRef);
return result;
}
/*******************************************************************************
* createHashForMT() - create a hash signature for the kext
* <rdar://problem/12435992> Message tracing for kext loads
*******************************************************************************/
static void createHashForMT(CFURLRef kextURL, char ** signatureBuffer)
{
CFMutableDictionaryRef signdict = NULL; // must release
SecCodeSignerRef signerRef = NULL; // must release
SecStaticCodeRef staticCodeRef = NULL; // must release
CFDataRef signature = NULL; // must release
CFDictionaryRef signingDict = NULL; // must release
CFDataRef cdhash = NULL; // must release
CFMutableDictionaryRef resourceRules = NULL; // must release
CFMutableDictionaryRef rules = NULL; // must release
CFMutableDictionaryRef omitPlugins = NULL; // must release
char * tempBufPtr = NULL; // do not free
if (!kextURL || !signatureBuffer) {
return;
}
/* Ad-hoc sign the code temporarily so we can get its hash */
if (SecStaticCodeCreateWithPath(kextURL,
kSecCSDefaultFlags,
&staticCodeRef) != 0 ||
(staticCodeRef == NULL)) {
OSKextLogMemError();
goto finish;
}
signature = CFDataCreateMutable(NULL, 0);
if (signature == NULL) {
OSKextLogMemError();
goto finish;
}
signdict = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (signdict == NULL) {
OSKextLogMemError();
goto finish;
}
CFDictionarySetValue(signdict, kSecCodeSignerIdentity, kCFNull);
CFDictionarySetValue(signdict, kSecCodeSignerDetached, signature);
resourceRules = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (resourceRules == NULL) {
OSKextLogMemError();
goto finish;
}
rules = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (rules == NULL) {
OSKextLogMemError();
goto finish;
}
omitPlugins = CFDictionaryCreateMutable(kCFAllocatorDefault, 0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (omitPlugins == NULL) {
OSKextLogMemError();
goto finish;
}
/* exclude PlugIns directory
*/
CFNumberRef myNumValue;
int myNum = 100;
myNumValue = CFNumberCreate(kCFAllocatorDefault,
kCFNumberIntType, &myNum);
if (myNumValue == NULL) {
OSKextLogMemError();
goto finish;
}
CFDictionarySetValue(omitPlugins, CFSTR("omit"), kCFBooleanTrue);
CFDictionarySetValue(omitPlugins, CFSTR("weight"), myNumValue);
CFRelease( myNumValue );
CFDictionarySetValue(rules, CFSTR("^.*"), kCFBooleanTrue);
CFDictionarySetValue(rules, CFSTR("^PlugIns/"), omitPlugins);
CFDictionarySetValue(resourceRules, CFSTR("rules"), rules);
CFDictionarySetValue(signdict, kSecCodeSignerResourceRules, resourceRules);
if (SecCodeSignerCreate(signdict, kSecCSDefaultFlags, &signerRef) != 0) {
OSKextLog(NULL, kOSKextLogDebugLevel | kOSKextLogGeneralFlag,
"%s - SecCodeSignerCreate failed", __func__);
goto finish;
}
if (SecCodeSignerAddSignature(signerRef, staticCodeRef, kSecCSDefaultFlags) != 0) {
OSKextLog(NULL, kOSKextLogDebugLevel | kOSKextLogGeneralFlag,
"%s - SecCodeSignerAddSignature failed", __func__);
goto finish;
}
if (SecCodeSetDetachedSignature(staticCodeRef, signature, kSecCSDefaultFlags) != 0) {
OSKextLog(NULL, kOSKextLogDebugLevel | kOSKextLogGeneralFlag,
"%s - SecCodeSetDetachedSignature failed", __func__);
goto finish;
}
/* get the hash info
*/
if (SecCodeCopySigningInformation(staticCodeRef, kSecCSDefaultFlags, &signingDict) != 0) {
OSKextLog(NULL, kOSKextLogDebugLevel | kOSKextLogGeneralFlag,
"%s - SecCodeCopySigningInformation failed", __func__);
goto finish;
}
cdhash = CFRetain(CFDictionaryGetValue(signingDict, kSecCodeInfoUnique));
if (cdhash) {
const UInt8 * hashDataPtr = NULL; // don't free
CFIndex hashDataLen = 0;
hashDataPtr = CFDataGetBytePtr(cdhash);
hashDataLen = CFDataGetLength(cdhash);
tempBufPtr = (char *) malloc((hashDataLen + 1) * 2);
if (tempBufPtr == NULL) {
OSKextLogMemError();
goto finish;
}
#if 0
OSKextLogCFString(/* kext */ NULL,
kOSKextLogErrorLevel | kOSKextLogGeneralFlag,
CFSTR("%s - cdhash %@"),
__func__,
cdhash);
#endif
bzero(tempBufPtr, ((hashDataLen + 1) * 2));
for (int i = 0; i < hashDataLen; i++) {
sprintf(tempBufPtr + (i * 2), "%02.2x", *(hashDataPtr + i));
}
}
finish:
SAFE_RELEASE(signdict);
SAFE_RELEASE(signerRef);
SAFE_RELEASE(staticCodeRef);
SAFE_RELEASE(signature);
SAFE_RELEASE(signingDict);
SAFE_RELEASE(cdhash);
SAFE_RELEASE(resourceRules);
SAFE_RELEASE(rules);
SAFE_RELEASE(omitPlugins);
*signatureBuffer = tempBufPtr;
}
/*******************************************************************************
* createArchitectureList() - create the list of architectures for the kext
* <rdar://13529984> MessageTrace which kexts are FAT
* Note: the caller must release the created CFStringRef
*******************************************************************************/
static CFStringRef createArchitectureList(OSKextRef aKext, CFBooleanRef *isFat)
{
if (aKext == NULL || isFat == NULL) {
return NULL;
}
*isFat = kCFBooleanFalse;
const NXArchInfo ** archList = NULL; // must free
CFMutableArrayRef archNamesList = NULL; // must release
CFStringRef archNames = NULL; // do not release
const char * archNameCString = NULL; // do not free
int index = 0;
archList = OSKextCopyArchitectures(aKext);
if (!archList) {
goto finish;
}
archNamesList = CFArrayCreateMutable(kCFAllocatorDefault,
0,
&kCFTypeArrayCallBacks);
if (!archNamesList) {
goto finish;
}
for (index=0; archList[index]; index++) {
archNameCString = archList[index]->name;
if (archNameCString) {
CFStringRef archName = NULL;
archName = CFStringCreateWithCString(kCFAllocatorDefault,
archNameCString,
kCFStringEncodingUTF8);
if (archName) {
CFArrayAppendValue(archNamesList, archName);
SAFE_RELEASE_NULL(archName);
}
}
}
if (index>1) {
*isFat = kCFBooleanTrue;
}
archNames = CFStringCreateByCombiningStrings(kCFAllocatorDefault,
archNamesList,
CFSTR(" "));
if (!archNames) {
goto finish;
}
finish:
SAFE_RELEASE(archNamesList);
SAFE_FREE(archList);
return archNames;
}
/*******************************************************************************
* copyTeamID() - copy the team id field from the given certificate
* Note: the caller must release the created CFStringRef
*******************************************************************************/
static CFStringRef copyTeamID(SecCertificateRef certificate)
{
if (!certificate ||
CFGetTypeID(certificate) !=SecCertificateGetTypeID()) {
return NULL;
}
CFDictionaryRef subjectDict = NULL; // do not release
CFArrayRef subjectArray = NULL; // do not release
CFDictionaryRef subjectInfo = NULL; // do not release
CFStringRef teamID = NULL; // do not release
CFErrorRef error = NULL; // do not release
CFMutableArrayRef certificateKeys = NULL; // must release
CFDictionaryRef certificateDict = NULL; // must release
certificateKeys = CFArrayCreateMutable(kCFAllocatorDefault,
1,
&kCFTypeArrayCallBacks);
if (!certificateKeys) {
goto finish;
}
CFArrayAppendValue(certificateKeys, kSecOIDX509V1SubjectName);
certificateDict = SecCertificateCopyValues(certificate,
certificateKeys,
&error);
if (error != errSecSuccess ||
!certificateDict ||
CFGetTypeID(certificateDict) != CFDictionaryGetTypeID()) {
goto finish;
}
subjectDict = (CFDictionaryRef) CFDictionaryGetValue(certificateDict,
kSecOIDX509V1SubjectName);
if (!subjectDict ||
CFGetTypeID(subjectDict) != CFDictionaryGetTypeID()) {
goto finish;
}
subjectArray = (CFArrayRef) CFDictionaryGetValue(subjectDict,
kSecPropertyKeyValue);
if (!subjectArray ||
CFGetTypeID(subjectArray) != CFArrayGetTypeID()) {
goto finish;
}
// Try to look for UserID field ("0.9.2342.19200300.100.1.1")
for (int index=0; index<CFArrayGetCount(subjectArray); index++) {
subjectInfo = (CFDictionaryRef) CFArrayGetValueAtIndex(subjectArray,
index);
if (!subjectInfo ||
CFGetTypeID(subjectInfo) != CFDictionaryGetTypeID()) {
continue;
}
CFStringRef label = NULL; // do not release
label = CFDictionaryGetValue(subjectInfo,
kSecPropertyKeyLabel);
if (kCFCompareEqualTo == CFStringCompare(label,
CFSTR("0.9.2342.19200300.100.1.1"),
0)) {
teamID = CFDictionaryGetValue(subjectInfo,
kSecPropertyKeyValue);
if (teamID &&
CFGetTypeID(teamID) == CFStringGetTypeID()) {
CFRetain(teamID);
goto finish;
}
else {
teamID = NULL;
}
}
}
// In case of failure, look for OU field ("2.5.4.11")
if (!teamID) {
for (int index=0; index<CFArrayGetCount(subjectArray); index++) {
subjectInfo = (CFDictionaryRef) CFArrayGetValueAtIndex(subjectArray,
index);
if (!subjectInfo ||
CFGetTypeID(subjectInfo) != CFDictionaryGetTypeID()) {
continue;
}
CFStringRef label = NULL; // do not release
label = CFDictionaryGetValue(subjectInfo,
kSecPropertyKeyLabel);
if (kCFCompareEqualTo == CFStringCompare(label,
CFSTR("2.5.4.11"),
0)) {
teamID = CFDictionaryGetValue(subjectInfo,
kSecPropertyKeyValue);
if (teamID &&
CFGetTypeID(teamID) == CFStringGetTypeID()) {
CFRetain(teamID);
goto finish;
}
else {
teamID = NULL;
}
}
}
}
finish:
if (!teamID && subjectArray) {
CFShow(subjectArray);
}
SAFE_RELEASE(certificateKeys);
SAFE_RELEASE(certificateDict);
return teamID;
}
/*******************************************************************************
* copyIssuerCN() - copy the issuer CN field from the given certificate
* Note: the caller must release the created CFStringRef
*******************************************************************************/
static CFStringRef copyIssuerCN(SecCertificateRef certificate)
{
if (!certificate ||
CFGetTypeID(certificate) !=SecCertificateGetTypeID()) {
return NULL;
}
CFStringRef issuerCN = NULL; // do not release
CFDictionaryRef issuerDict = NULL; // do not release
CFArrayRef issuerArray = NULL; // do not release
CFDictionaryRef issuerInfo = NULL; // do not release
CFErrorRef error = NULL; // do not release
CFMutableArrayRef certificateKeys = NULL; // must release
CFDictionaryRef certificateDict = NULL; // must release
certificateKeys = CFArrayCreateMutable(kCFAllocatorDefault,
1,
&kCFTypeArrayCallBacks);
if (!certificateKeys) {
goto finish;
}
CFArrayAppendValue(certificateKeys, kSecOIDX509V1IssuerName);
certificateDict = SecCertificateCopyValues(certificate,
certificateKeys,
&error);
if (error != errSecSuccess ||
!certificateDict ||
CFGetTypeID(certificateDict) != CFDictionaryGetTypeID()) {
goto finish;
}
issuerDict = (CFDictionaryRef) CFDictionaryGetValue(certificateDict,
kSecOIDX509V1IssuerName);
if (!issuerDict ||
CFGetTypeID(issuerDict) != CFDictionaryGetTypeID()) {
goto finish;
}
issuerArray = (CFArrayRef) CFDictionaryGetValue(issuerDict,
kSecPropertyKeyValue);
if (!issuerArray ||
CFGetTypeID(issuerArray) != CFArrayGetTypeID()) {
goto finish;
}
for (int index=0; index<CFArrayGetCount(issuerArray); index++) {
issuerInfo = (CFDictionaryRef) CFArrayGetValueAtIndex(issuerArray,
index);
if (!issuerInfo ||
CFGetTypeID(issuerInfo) != CFDictionaryGetTypeID()) {
continue;
}
CFStringRef label = NULL; // do not release
label = CFDictionaryGetValue(issuerInfo,
kSecPropertyKeyLabel);
if (kCFCompareEqualTo == CFStringCompare(label,
CFSTR("2.5.4.3"),
0)) {
issuerCN = CFDictionaryGetValue(issuerInfo,
kSecPropertyKeyValue);
if (issuerCN &&
CFGetTypeID(issuerCN) == CFStringGetTypeID()) {
CFRetain(issuerCN);
goto finish;
}
else {
issuerCN = NULL;
}
}
}
finish:
SAFE_RELEASE(certificateDict);
SAFE_RELEASE(certificateKeys);
return issuerCN;
}
/*******************************************************************************
* copyCDHash() - copy the SHA-1 hash of the code
* Note: the caller must release the created CFStringRef
*******************************************************************************/
static CFStringRef copyCDHash(SecStaticCodeRef code)
{
CFDictionaryRef signingInfo = NULL; // must release
char * tempBufPtr = NULL; // free
const UInt8 * hashDataPtr = NULL; // do not free
CFDataRef cdhash = NULL; // do not release
CFStringRef hash = NULL; // do not release
CFIndex hashDataLen = 0;
SecCodeCopySigningInformation(code,
kSecCSDefaultFlags,
&signingInfo);
if (!signingInfo) {
goto finish;
}
cdhash = CFDictionaryGetValue(signingInfo, kSecCodeInfoUnique);
if (!cdhash ||
CFGetTypeID(cdhash) != CFDataGetTypeID()) {
goto finish;
}
hashDataPtr = CFDataGetBytePtr(cdhash);
hashDataLen = CFDataGetLength(cdhash);
tempBufPtr = (char *) malloc((hashDataLen + 1) * 2);
if (tempBufPtr == NULL) {
OSKextLogMemError();
goto finish;
}
bzero(tempBufPtr, ((hashDataLen + 1) * 2));
for (int i = 0; i < hashDataLen; i++) {
sprintf(tempBufPtr + (i * 2), "%02.2x", *(hashDataPtr + i));
}
if (tempBufPtr) {
hash = CFStringCreateWithCString(kCFAllocatorDefault,
tempBufPtr,
kCFStringEncodingUTF8);
}
finish:
SAFE_FREE(tempBufPtr);
SAFE_RELEASE(signingInfo);
return hash;
}
/*******************************************************************************
* copySigningInfo() - copy a set of signing information for the given kext
* cdhash: the SHA-1 hash
* teamid: the team id of the leaf certificate
* subjectCN: the subject common name of the leaf certificate
* issuerCN: the issuer common name of the leaf certificate
* Note: the caller must release the created CFStringRefs
*******************************************************************************/
static void copySigningInfo(CFURLRef kextURL,
CFStringRef* cdhash,
CFStringRef* teamId,
CFStringRef* subjectCN,
CFStringRef* issuerCN)
{
if (!kextURL) {
return;
}
SecStaticCodeRef code = NULL; // must release
CFDictionaryRef information = NULL; // must release
SecCertificateRef issuerCertificate = NULL; // do not release
CFArrayRef certificateChain = NULL; // do not release
OSStatus status;
CFIndex count;
if (SecStaticCodeCreateWithPath(kextURL,
kSecCSDefaultFlags,
&code) != 0
|| (code == NULL)) {
OSKextLogMemError();
goto finish;
}
if (cdhash) {
*cdhash = copyCDHash(code);
}
status = SecCodeCopySigningInformation(code,
kSecCSSigningInformation,
&information);
if (status != noErr) {
goto finish;
}
// a CFArrayRef array of SecCertificateRef objects
certificateChain = (CFArrayRef) CFDictionaryGetValue(information, kSecCodeInfoCertificates);
if (!certificateChain ||
CFGetTypeID(certificateChain) != CFArrayGetTypeID()) {
goto finish;
}
count = CFArrayGetCount(certificateChain);
if (count < 1) {
goto finish;
}
issuerCertificate = (SecCertificateRef) CFArrayGetValueAtIndex(certificateChain, 0);
if (!issuerCertificate) {
goto finish;
}
if (subjectCN) {
SecCertificateCopyCommonName(issuerCertificate, subjectCN);
}
if (teamId) {
*teamId = copyTeamID(issuerCertificate);
}
if (issuerCN) {
*issuerCN = copyIssuerCN(issuerCertificate);
}
finish:
SAFE_RELEASE(code);
SAFE_RELEASE(information);
return;
}
/*******************************************************************************
* copySubjectCNArray() - copy the subject CN from every certificate in the kext's
* certificate chain.
* Note: the caller must release the created CFArrayRef
*******************************************************************************/
static CFArrayRef copySubjectCNArray(CFURLRef kextURL)
{
if (!kextURL) {
return NULL;
}
CFMutableArrayRef subjectCNArray = NULL; // do not release
CFArrayRef certificateChain = NULL; // do not release
SecCertificateRef certificate = NULL; // do not release
SecStaticCodeRef code = NULL; // must release
CFDictionaryRef information = NULL; // must release
OSStatus status;
CFIndex count;
subjectCNArray = CFArrayCreateMutable(kCFAllocatorDefault,
0,
&kCFTypeArrayCallBacks);
if (!subjectCNArray) {
goto finish;
}
if (SecStaticCodeCreateWithPath(kextURL,
kSecCSDefaultFlags,
&code) != 0
|| (code == NULL)) {
OSKextLogMemError();
goto finish;
}
status = SecCodeCopySigningInformation(code,
kSecCSSigningInformation,
&information);
if (status != noErr) {
goto finish;
}
certificateChain = (CFArrayRef) CFDictionaryGetValue(information, kSecCodeInfoCertificates);
if (!certificateChain ||
CFGetTypeID(certificateChain) != CFArrayGetTypeID()) {
goto finish;
}
count = CFArrayGetCount(certificateChain);
if (count < 1) {
goto finish;
}
for (CFIndex i=0; i<count; i++) {
certificate = (SecCertificateRef) CFArrayGetValueAtIndex(certificateChain, i);
CFStringRef subjectCN = NULL; // must release
SecCertificateCopyCommonName(certificate, &subjectCN);
if (subjectCN) {
CFArrayAppendValue(subjectCNArray, subjectCN);
SAFE_RELEASE(subjectCN);
}
}
finish:
SAFE_RELEASE(code);
SAFE_RELEASE(information);
return subjectCNArray;
}
/*******************************************************************************
* filterKextLoadForMT() - check that the kext is of interest, and place kext
* information in the kext list
* <rdar://problem/12435992> Message tracing for kext loads
*******************************************************************************/
static void filterKextLoadForMT(OSKextRef aKext, CFMutableArrayRef *kextList)
{
if (aKext == NULL || kextList == NULL)
return;
CFStringRef versionString; // do not release
CFStringRef bundleIDString; // do not release
CFStringRef kextSigningCategory = NULL; // do not release
CFBooleanRef isFat = kCFBooleanFalse; // do not release
CFBooleanRef isSigned = kCFBooleanFalse; // do not release
CFURLRef kextURL = NULL; // must release
CFStringRef kextPath = NULL; // must release
CFStringRef filename = NULL; // must release
CFStringRef hashString = NULL; // must release
CFStringRef archString = NULL; // must release
CFStringRef teamId = NULL; // must release
CFStringRef subjectCN = NULL; // must release
CFStringRef issuerCN = NULL; // must release
SecStaticCodeRef code = NULL; // must release
CFDictionaryRef information = NULL; // must release
CFMutableDictionaryRef kextDict = NULL; // must release
char * hashCString = NULL; // must free
OSStatus status = noErr;
/* do not message trace this if boot-args has debug set */
if (isDebugSetInBootargs()) {
return;
}
kextURL = CFURLCopyAbsoluteURL(OSKextGetURL(aKext));
if (!kextURL) {
OSKextLogMemError();
goto finish;
}
kextPath = CFURLCopyFileSystemPath(kextURL, kCFURLPOSIXPathStyle);
if (!kextPath) {
OSKextLogMemError();
goto finish;
}
versionString = OSKextGetValueForInfoDictionaryKey(aKext,
kCFBundleVersionKey);
bundleIDString = OSKextGetValueForInfoDictionaryKey(aKext,
kCFBundleIdentifierKey);
filename = CFURLCopyLastPathComponent(kextURL);
archString = createArchitectureList(aKext, &isFat);
if (SecStaticCodeCreateWithPath(kextURL,
kSecCSDefaultFlags,
&code) != 0
|| (code == NULL)) {
OSKextLogMemError();
goto finish;
}
status = SecCodeCopySigningInformation(code,
kSecCSSigningInformation,
&information);
if (status != noErr) {
goto finish;
}
isSigned = CFDictionaryContainsKey(information, kSecCodeInfoIdentifier);
if (!isSigned) {
/* The kext is unsigned, so there is little information we can retrieve.
* A hash of the kext is generated for data collection. */
kextSigningCategory = CFSTR(kUnsignedKext);
createHashForMT(kextURL, &hashCString);
if (hashCString) {
hashString = CFStringCreateWithCString(kCFAllocatorDefault,
hashCString,
kCFStringEncodingUTF8);
}
}
else {
CFStringRef myCFString = NULL; // do not release
myCFString = OSKextGetIdentifier(aKext);
status = checkKextSignature(aKext, true);
if (CFStringHasPrefix(myCFString, __kOSKextApplePrefix)) {
if (status == noErr) {
/* This is a signed Apple kext, with an Apple root certificate.
* There is no need to retrieve additional signing information */
kextSigningCategory = CFSTR(kAppleKextWithAppleRoot);
copySigningInfo(kextURL,
&hashString,
NULL,
NULL,
NULL);
}
else {
/* This is a signed Apple kext, but the root certificate is not Apple.
* This should not happen, so it is better to flag it as unsigned for
* collection purpose. */
kextSigningCategory = CFSTR(kUnsignedKext);
copySigningInfo(kextURL,
&hashString,
&teamId,
NULL,
&issuerCN);
CFArrayRef subjectCNArray = NULL; // must release
subjectCNArray = copySubjectCNArray(kextURL);
if (subjectCNArray) {
subjectCN = CFStringCreateByCombiningStrings(kCFAllocatorDefault,
subjectCNArray,
CFSTR(";"));
SAFE_RELEASE(subjectCNArray);
}
}
}
else {
if (status == noErr) {
/* This 3rd-party kext is signed with a devid+ kext certificate */
kextSigningCategory = CFSTR(k3rdPartyKextWithDevIdPlus);
copySigningInfo(kextURL,
&hashString,
&teamId,
&subjectCN,
&issuerCN);
}
else if (status == CSSMERR_TP_CERT_REVOKED) {
/* This 3rd-party kext is signed with a revoked devid+ kext certificate */
kextSigningCategory = CFSTR(k3rdPartyKextWithRevokedDevIdPlus);
copySigningInfo(kextURL,
&hashString,
&teamId,
&subjectCN,
&issuerCN);
}
else {
status = checkRootCertificateIsApple(aKext);
if (status == noErr) {
/* This 3rd-party kext is not signed with a devid+ certificate,
* but uses an Apple root certificate. */
kextSigningCategory = CFSTR(k3rdPartyKextWithAppleRoot);
/* The certificates may not have the expected format.
* Attempt to get the information if present, and also
* retrieve the subject cn of every certificate in the chain. */
copySigningInfo(kextURL,
&hashString,
&teamId,
NULL,
&issuerCN);
CFArrayRef subjectCNArray = NULL; // must release
subjectCNArray = copySubjectCNArray(kextURL);
if (subjectCNArray) {
subjectCN = CFStringCreateByCombiningStrings(kCFAllocatorDefault,
subjectCNArray,
CFSTR(";"));
SAFE_RELEASE(subjectCNArray);
}
}
else {
/* This 3rd-party kext is not signed with a devid+ certificate,
* and does not use an Apple root certificate. */
kextSigningCategory = CFSTR(k3rdPartyKextWithoutAppleRoot);
/* The certificates may not have the expected format.
* The subjectcn, issuercn and teamid must not be logged. */
copySigningInfo(kextURL,
&hashString,
NULL,
NULL,
NULL);
}
}
}
}
kextDict = CFDictionaryCreateMutable(kCFAllocatorDefault,
0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
if (!kextDict) {
OSKextLogMemError();
goto finish;
}