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
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
|
/*
BlueZ - Bluetooth protocol stack for Linux
Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation;
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
SOFTWARE IS DISCLAIMED.
*/
#include <linux/debugfs.h>
#include <linux/scatterlist.h>
#include <linux/crypto.h>
#include <crypto/aes.h>
#include <crypto/algapi.h>
#include <crypto/b128ops.h>
#include <crypto/hash.h>
#include <crypto/kpp.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#include <net/bluetooth/mgmt.h>
#include "ecdh_helper.h"
#include "smp.h"
#define SMP_DEV(hdev) \
((struct smp_dev *)((struct l2cap_chan *)((hdev)->smp_data))->data)
/* Low-level debug macros to be used for stuff that we don't want
* accidentially in dmesg, i.e. the values of the various crypto keys
* and the inputs & outputs of crypto functions.
*/
#ifdef DEBUG
#define SMP_DBG(fmt, ...) printk(KERN_DEBUG "%s: " fmt, __func__, \
##__VA_ARGS__)
#else
#define SMP_DBG(fmt, ...) no_printk(KERN_DEBUG "%s: " fmt, __func__, \
##__VA_ARGS__)
#endif
#define SMP_ALLOW_CMD(smp, code) set_bit(code, &smp->allow_cmd)
/* Keys which are not distributed with Secure Connections */
#define SMP_SC_NO_DIST (SMP_DIST_ENC_KEY | SMP_DIST_LINK_KEY);
#define SMP_TIMEOUT msecs_to_jiffies(30000)
#define AUTH_REQ_MASK(dev) (hci_dev_test_flag(dev, HCI_SC_ENABLED) ? \
0x3f : 0x07)
#define KEY_DIST_MASK 0x07
/* Maximum message length that can be passed to aes_cmac */
#define CMAC_MSG_MAX 80
enum {
SMP_FLAG_TK_VALID,
SMP_FLAG_CFM_PENDING,
SMP_FLAG_MITM_AUTH,
SMP_FLAG_COMPLETE,
SMP_FLAG_INITIATOR,
SMP_FLAG_SC,
SMP_FLAG_REMOTE_PK,
SMP_FLAG_DEBUG_KEY,
SMP_FLAG_WAIT_USER,
SMP_FLAG_DHKEY_PENDING,
SMP_FLAG_REMOTE_OOB,
SMP_FLAG_LOCAL_OOB,
SMP_FLAG_CT2,
};
struct smp_dev {
/* Secure Connections OOB data */
bool local_oob;
u8 local_pk[64];
u8 local_rand[16];
bool debug_key;
struct crypto_shash *tfm_cmac;
struct crypto_kpp *tfm_ecdh;
};
struct smp_chan {
struct l2cap_conn *conn;
struct delayed_work security_timer;
unsigned long allow_cmd; /* Bitmask of allowed commands */
u8 preq[7]; /* SMP Pairing Request */
u8 prsp[7]; /* SMP Pairing Response */
u8 prnd[16]; /* SMP Pairing Random (local) */
u8 rrnd[16]; /* SMP Pairing Random (remote) */
u8 pcnf[16]; /* SMP Pairing Confirm */
u8 tk[16]; /* SMP Temporary Key */
u8 rr[16]; /* Remote OOB ra/rb value */
u8 lr[16]; /* Local OOB ra/rb value */
u8 enc_key_size;
u8 remote_key_dist;
bdaddr_t id_addr;
u8 id_addr_type;
u8 irk[16];
struct smp_csrk *csrk;
struct smp_csrk *slave_csrk;
struct smp_ltk *ltk;
struct smp_ltk *slave_ltk;
struct smp_irk *remote_irk;
u8 *link_key;
unsigned long flags;
u8 method;
u8 passkey_round;
/* Secure Connections variables */
u8 local_pk[64];
u8 remote_pk[64];
u8 dhkey[32];
u8 mackey[16];
struct crypto_shash *tfm_cmac;
struct crypto_kpp *tfm_ecdh;
};
/* These debug key values are defined in the SMP section of the core
* specification. debug_pk is the public debug key and debug_sk the
* private debug key.
*/
static const u8 debug_pk[64] = {
0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20,
0x8b, 0xd2, 0x89, 0x15, 0xd0, 0x8e, 0x1c, 0x74,
0x24, 0x30, 0xed, 0x8f, 0xc2, 0x45, 0x63, 0x76,
0x5c, 0x15, 0x52, 0x5a, 0xbf, 0x9a, 0x32, 0x63,
0x6d, 0xeb, 0x2a, 0x65, 0x49, 0x9c, 0x80, 0xdc,
};
static const u8 debug_sk[32] = {
0xbd, 0x1a, 0x3c, 0xcd, 0xa6, 0xb8, 0x99, 0x58,
0x99, 0xb7, 0x40, 0xeb, 0x7b, 0x60, 0xff, 0x4a,
0x50, 0x3f, 0x10, 0xd2, 0xe3, 0xb3, 0xc9, 0x74,
0x38, 0x5f, 0xc5, 0xa3, 0xd4, 0xf6, 0x49, 0x3f,
};
static inline void swap_buf(const u8 *src, u8 *dst, size_t len)
{
size_t i;
for (i = 0; i < len; i++)
dst[len - 1 - i] = src[i];
}
/* The following functions map to the LE SC SMP crypto functions
* AES-CMAC, f4, f5, f6, g2 and h6.
*/
static int aes_cmac(struct crypto_shash *tfm, const u8 k[16], const u8 *m,
size_t len, u8 mac[16])
{
uint8_t tmp[16], mac_msb[16], msg_msb[CMAC_MSG_MAX];
int err;
if (len > CMAC_MSG_MAX)
return -EFBIG;
if (!tfm) {
BT_ERR("tfm %p", tfm);
return -EINVAL;
}
/* Swap key and message from LSB to MSB */
swap_buf(k, tmp, 16);
swap_buf(m, msg_msb, len);
SMP_DBG("msg (len %zu) %*phN", len, (int) len, m);
SMP_DBG("key %16phN", k);
err = crypto_shash_setkey(tfm, tmp, 16);
if (err) {
BT_ERR("cipher setkey failed: %d", err);
return err;
}
err = crypto_shash_tfm_digest(tfm, msg_msb, len, mac_msb);
if (err) {
BT_ERR("Hash computation error %d", err);
return err;
}
swap_buf(mac_msb, mac, 16);
SMP_DBG("mac %16phN", mac);
return 0;
}
static int smp_f4(struct crypto_shash *tfm_cmac, const u8 u[32],
const u8 v[32], const u8 x[16], u8 z, u8 res[16])
{
u8 m[65];
int err;
SMP_DBG("u %32phN", u);
SMP_DBG("v %32phN", v);
SMP_DBG("x %16phN z %02x", x, z);
m[0] = z;
memcpy(m + 1, v, 32);
memcpy(m + 33, u, 32);
err = aes_cmac(tfm_cmac, x, m, sizeof(m), res);
if (err)
return err;
SMP_DBG("res %16phN", res);
return err;
}
static int smp_f5(struct crypto_shash *tfm_cmac, const u8 w[32],
const u8 n1[16], const u8 n2[16], const u8 a1[7],
const u8 a2[7], u8 mackey[16], u8 ltk[16])
{
/* The btle, salt and length "magic" values are as defined in
* the SMP section of the Bluetooth core specification. In ASCII
* the btle value ends up being 'btle'. The salt is just a
* random number whereas length is the value 256 in little
* endian format.
*/
const u8 btle[4] = { 0x65, 0x6c, 0x74, 0x62 };
const u8 salt[16] = { 0xbe, 0x83, 0x60, 0x5a, 0xdb, 0x0b, 0x37, 0x60,
0x38, 0xa5, 0xf5, 0xaa, 0x91, 0x83, 0x88, 0x6c };
const u8 length[2] = { 0x00, 0x01 };
u8 m[53], t[16];
int err;
SMP_DBG("w %32phN", w);
SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
SMP_DBG("a1 %7phN a2 %7phN", a1, a2);
err = aes_cmac(tfm_cmac, salt, w, 32, t);
if (err)
return err;
SMP_DBG("t %16phN", t);
memcpy(m, length, 2);
memcpy(m + 2, a2, 7);
memcpy(m + 9, a1, 7);
memcpy(m + 16, n2, 16);
memcpy(m + 32, n1, 16);
memcpy(m + 48, btle, 4);
m[52] = 0; /* Counter */
err = aes_cmac(tfm_cmac, t, m, sizeof(m), mackey);
if (err)
return err;
SMP_DBG("mackey %16phN", mackey);
m[52] = 1; /* Counter */
err = aes_cmac(tfm_cmac, t, m, sizeof(m), ltk);
if (err)
return err;
SMP_DBG("ltk %16phN", ltk);
return 0;
}
static int smp_f6(struct crypto_shash *tfm_cmac, const u8 w[16],
const u8 n1[16], const u8 n2[16], const u8 r[16],
const u8 io_cap[3], const u8 a1[7], const u8 a2[7],
u8 res[16])
{
u8 m[65];
int err;
SMP_DBG("w %16phN", w);
SMP_DBG("n1 %16phN n2 %16phN", n1, n2);
SMP_DBG("r %16phN io_cap %3phN a1 %7phN a2 %7phN", r, io_cap, a1, a2);
memcpy(m, a2, 7);
memcpy(m + 7, a1, 7);
memcpy(m + 14, io_cap, 3);
memcpy(m + 17, r, 16);
memcpy(m + 33, n2, 16);
memcpy(m + 49, n1, 16);
err = aes_cmac(tfm_cmac, w, m, sizeof(m), res);
if (err)
return err;
SMP_DBG("res %16phN", res);
return err;
}
static int smp_g2(struct crypto_shash *tfm_cmac, const u8 u[32], const u8 v[32],
const u8 x[16], const u8 y[16], u32 *val)
{
u8 m[80], tmp[16];
int err;
SMP_DBG("u %32phN", u);
SMP_DBG("v %32phN", v);
SMP_DBG("x %16phN y %16phN", x, y);
memcpy(m, y, 16);
memcpy(m + 16, v, 32);
memcpy(m + 48, u, 32);
err = aes_cmac(tfm_cmac, x, m, sizeof(m), tmp);
if (err)
return err;
*val = get_unaligned_le32(tmp);
*val %= 1000000;
SMP_DBG("val %06u", *val);
return 0;
}
static int smp_h6(struct crypto_shash *tfm_cmac, const u8 w[16],
const u8 key_id[4], u8 res[16])
{
int err;
SMP_DBG("w %16phN key_id %4phN", w, key_id);
err = aes_cmac(tfm_cmac, w, key_id, 4, res);
if (err)
return err;
SMP_DBG("res %16phN", res);
return err;
}
static int smp_h7(struct crypto_shash *tfm_cmac, const u8 w[16],
const u8 salt[16], u8 res[16])
{
int err;
SMP_DBG("w %16phN salt %16phN", w, salt);
err = aes_cmac(tfm_cmac, salt, w, 16, res);
if (err)
return err;
SMP_DBG("res %16phN", res);
return err;
}
/* The following functions map to the legacy SMP crypto functions e, c1,
* s1 and ah.
*/
static int smp_e(const u8 *k, u8 *r)
{
struct crypto_aes_ctx ctx;
uint8_t tmp[16], data[16];
int err;
SMP_DBG("k %16phN r %16phN", k, r);
/* The most significant octet of key corresponds to k[0] */
swap_buf(k, tmp, 16);
err = aes_expandkey(&ctx, tmp, 16);
if (err) {
BT_ERR("cipher setkey failed: %d", err);
return err;
}
/* Most significant octet of plaintextData corresponds to data[0] */
swap_buf(r, data, 16);
aes_encrypt(&ctx, data, data);
/* Most significant octet of encryptedData corresponds to data[0] */
swap_buf(data, r, 16);
SMP_DBG("r %16phN", r);
memzero_explicit(&ctx, sizeof (ctx));
return err;
}
static int smp_c1(const u8 k[16],
const u8 r[16], const u8 preq[7], const u8 pres[7], u8 _iat,
const bdaddr_t *ia, u8 _rat, const bdaddr_t *ra, u8 res[16])
{
u8 p1[16], p2[16];
int err;
SMP_DBG("k %16phN r %16phN", k, r);
SMP_DBG("iat %u ia %6phN rat %u ra %6phN", _iat, ia, _rat, ra);
SMP_DBG("preq %7phN pres %7phN", preq, pres);
memset(p1, 0, 16);
/* p1 = pres || preq || _rat || _iat */
p1[0] = _iat;
p1[1] = _rat;
memcpy(p1 + 2, preq, 7);
memcpy(p1 + 9, pres, 7);
SMP_DBG("p1 %16phN", p1);
/* res = r XOR p1 */
u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
/* res = e(k, res) */
err = smp_e(k, res);
if (err) {
BT_ERR("Encrypt data error");
return err;
}
/* p2 = padding || ia || ra */
memcpy(p2, ra, 6);
memcpy(p2 + 6, ia, 6);
memset(p2 + 12, 0, 4);
SMP_DBG("p2 %16phN", p2);
/* res = res XOR p2 */
u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
/* res = e(k, res) */
err = smp_e(k, res);
if (err)
BT_ERR("Encrypt data error");
return err;
}
static int smp_s1(const u8 k[16],
const u8 r1[16], const u8 r2[16], u8 _r[16])
{
int err;
/* Just least significant octets from r1 and r2 are considered */
memcpy(_r, r2, 8);
memcpy(_r + 8, r1, 8);
err = smp_e(k, _r);
if (err)
BT_ERR("Encrypt data error");
return err;
}
static int smp_ah(const u8 irk[16], const u8 r[3], u8 res[3])
{
u8 _res[16];
int err;
/* r' = padding || r */
memcpy(_res, r, 3);
memset(_res + 3, 0, 13);
err = smp_e(irk, _res);
if (err) {
BT_ERR("Encrypt error");
return err;
}
/* The output of the random address function ah is:
* ah(k, r) = e(k, r') mod 2^24
* The output of the security function e is then truncated to 24 bits
* by taking the least significant 24 bits of the output of e as the
* result of ah.
*/
memcpy(res, _res, 3);
return 0;
}
bool smp_irk_matches(struct hci_dev *hdev, const u8 irk[16],
const bdaddr_t *bdaddr)
{
struct l2cap_chan *chan = hdev->smp_data;
u8 hash[3];
int err;
if (!chan || !chan->data)
return false;
bt_dev_dbg(hdev, "RPA %pMR IRK %*phN", bdaddr, 16, irk);
err = smp_ah(irk, &bdaddr->b[3], hash);
if (err)
return false;
return !crypto_memneq(bdaddr->b, hash, 3);
}
int smp_generate_rpa(struct hci_dev *hdev, const u8 irk[16], bdaddr_t *rpa)
{
struct l2cap_chan *chan = hdev->smp_data;
int err;
if (!chan || !chan->data)
return -EOPNOTSUPP;
get_random_bytes(&rpa->b[3], 3);
rpa->b[5] &= 0x3f; /* Clear two most significant bits */
rpa->b[5] |= 0x40; /* Set second most significant bit */
err = smp_ah(irk, &rpa->b[3], rpa->b);
if (err < 0)
return err;
bt_dev_dbg(hdev, "RPA %pMR", rpa);
return 0;
}
int smp_generate_oob(struct hci_dev *hdev, u8 hash[16], u8 rand[16])
{
struct l2cap_chan *chan = hdev->smp_data;
struct smp_dev *smp;
int err;
if (!chan || !chan->data)
return -EOPNOTSUPP;
smp = chan->data;
if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
bt_dev_dbg(hdev, "Using debug keys");
err = set_ecdh_privkey(smp->tfm_ecdh, debug_sk);
if (err)
return err;
memcpy(smp->local_pk, debug_pk, 64);
smp->debug_key = true;
} else {
while (true) {
/* Generate key pair for Secure Connections */
err = generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk);
if (err)
return err;
/* This is unlikely, but we need to check that
* we didn't accidentially generate a debug key.
*/
if (crypto_memneq(smp->local_pk, debug_pk, 64))
break;
}
smp->debug_key = false;
}
SMP_DBG("OOB Public Key X: %32phN", smp->local_pk);
SMP_DBG("OOB Public Key Y: %32phN", smp->local_pk + 32);
get_random_bytes(smp->local_rand, 16);
err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->local_pk,
smp->local_rand, 0, hash);
if (err < 0)
return err;
memcpy(rand, smp->local_rand, 16);
smp->local_oob = true;
return 0;
}
static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp;
struct kvec iv[2];
struct msghdr msg;
if (!chan)
return;
BT_DBG("code 0x%2.2x", code);
iv[0].iov_base = &code;
iv[0].iov_len = 1;
iv[1].iov_base = data;
iv[1].iov_len = len;
memset(&msg, 0, sizeof(msg));
iov_iter_kvec(&msg.msg_iter, WRITE, iv, 2, 1 + len);
l2cap_chan_send(chan, &msg, 1 + len);
if (!chan->data)
return;
smp = chan->data;
cancel_delayed_work_sync(&smp->security_timer);
schedule_delayed_work(&smp->security_timer, SMP_TIMEOUT);
}
static u8 authreq_to_seclevel(u8 authreq)
{
if (authreq & SMP_AUTH_MITM) {
if (authreq & SMP_AUTH_SC)
return BT_SECURITY_FIPS;
else
return BT_SECURITY_HIGH;
} else {
return BT_SECURITY_MEDIUM;
}
}
static __u8 seclevel_to_authreq(__u8 sec_level)
{
switch (sec_level) {
case BT_SECURITY_FIPS:
case BT_SECURITY_HIGH:
return SMP_AUTH_MITM | SMP_AUTH_BONDING;
case BT_SECURITY_MEDIUM:
return SMP_AUTH_BONDING;
default:
return SMP_AUTH_NONE;
}
}
static void build_pairing_cmd(struct l2cap_conn *conn,
struct smp_cmd_pairing *req,
struct smp_cmd_pairing *rsp, __u8 authreq)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
u8 local_dist = 0, remote_dist = 0, oob_flag = SMP_OOB_NOT_PRESENT;
if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
authreq |= SMP_AUTH_BONDING;
} else {
authreq &= ~SMP_AUTH_BONDING;
}
if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
remote_dist |= SMP_DIST_ID_KEY;
if (hci_dev_test_flag(hdev, HCI_PRIVACY))
local_dist |= SMP_DIST_ID_KEY;
if (hci_dev_test_flag(hdev, HCI_SC_ENABLED) &&
(authreq & SMP_AUTH_SC)) {
struct oob_data *oob_data;
u8 bdaddr_type;
if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
local_dist |= SMP_DIST_LINK_KEY;
remote_dist |= SMP_DIST_LINK_KEY;
}
if (hcon->dst_type == ADDR_LE_DEV_PUBLIC)
bdaddr_type = BDADDR_LE_PUBLIC;
else
bdaddr_type = BDADDR_LE_RANDOM;
oob_data = hci_find_remote_oob_data(hdev, &hcon->dst,
bdaddr_type);
if (oob_data && oob_data->present) {
set_bit(SMP_FLAG_REMOTE_OOB, &smp->flags);
oob_flag = SMP_OOB_PRESENT;
memcpy(smp->rr, oob_data->rand256, 16);
memcpy(smp->pcnf, oob_data->hash256, 16);
SMP_DBG("OOB Remote Confirmation: %16phN", smp->pcnf);
SMP_DBG("OOB Remote Random: %16phN", smp->rr);
}
} else {
authreq &= ~SMP_AUTH_SC;
}
if (rsp == NULL) {
req->io_capability = conn->hcon->io_capability;
req->oob_flag = oob_flag;
req->max_key_size = hdev->le_max_key_size;
req->init_key_dist = local_dist;
req->resp_key_dist = remote_dist;
req->auth_req = (authreq & AUTH_REQ_MASK(hdev));
smp->remote_key_dist = remote_dist;
return;
}
rsp->io_capability = conn->hcon->io_capability;
rsp->oob_flag = oob_flag;
rsp->max_key_size = hdev->le_max_key_size;
rsp->init_key_dist = req->init_key_dist & remote_dist;
rsp->resp_key_dist = req->resp_key_dist & local_dist;
rsp->auth_req = (authreq & AUTH_REQ_MASK(hdev));
smp->remote_key_dist = rsp->init_key_dist;
}
static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
{
struct l2cap_chan *chan = conn->smp;
struct hci_dev *hdev = conn->hcon->hdev;
struct smp_chan *smp = chan->data;
if (conn->hcon->pending_sec_level == BT_SECURITY_FIPS &&
max_key_size != SMP_MAX_ENC_KEY_SIZE)
return SMP_ENC_KEY_SIZE;
if (max_key_size > hdev->le_max_key_size ||
max_key_size < SMP_MIN_ENC_KEY_SIZE)
return SMP_ENC_KEY_SIZE;
smp->enc_key_size = max_key_size;
return 0;
}
static void smp_chan_destroy(struct l2cap_conn *conn)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_conn *hcon = conn->hcon;
bool complete;
BUG_ON(!smp);
cancel_delayed_work_sync(&smp->security_timer);
complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
mgmt_smp_complete(hcon, complete);
kfree_sensitive(smp->csrk);
kfree_sensitive(smp->slave_csrk);
kfree_sensitive(smp->link_key);
crypto_free_shash(smp->tfm_cmac);
crypto_free_kpp(smp->tfm_ecdh);
/* Ensure that we don't leave any debug key around if debug key
* support hasn't been explicitly enabled.
*/
if (smp->ltk && smp->ltk->type == SMP_LTK_P256_DEBUG &&
!hci_dev_test_flag(hcon->hdev, HCI_KEEP_DEBUG_KEYS)) {
list_del_rcu(&smp->ltk->list);
kfree_rcu(smp->ltk, rcu);
smp->ltk = NULL;
}
/* If pairing failed clean up any keys we might have */
if (!complete) {
if (smp->ltk) {
list_del_rcu(&smp->ltk->list);
kfree_rcu(smp->ltk, rcu);
}
if (smp->slave_ltk) {
list_del_rcu(&smp->slave_ltk->list);
kfree_rcu(smp->slave_ltk, rcu);
}
if (smp->remote_irk) {
list_del_rcu(&smp->remote_irk->list);
kfree_rcu(smp->remote_irk, rcu);
}
}
chan->data = NULL;
kfree_sensitive(smp);
hci_conn_drop(hcon);
}
static void smp_failure(struct l2cap_conn *conn, u8 reason)
{
struct hci_conn *hcon = conn->hcon;
struct l2cap_chan *chan = conn->smp;
if (reason)
smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
&reason);
mgmt_auth_failed(hcon, HCI_ERROR_AUTH_FAILURE);
if (chan->data)
smp_chan_destroy(conn);
}
#define JUST_WORKS 0x00
#define JUST_CFM 0x01
#define REQ_PASSKEY 0x02
#define CFM_PASSKEY 0x03
#define REQ_OOB 0x04
#define DSP_PASSKEY 0x05
#define OVERLAP 0xFF
static const u8 gen_method[5][5] = {
{ JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
{ JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
{ CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
{ JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
{ CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
};
static const u8 sc_method[5][5] = {
{ JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
{ JUST_WORKS, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
{ DSP_PASSKEY, DSP_PASSKEY, REQ_PASSKEY, JUST_WORKS, DSP_PASSKEY },
{ JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
{ DSP_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
};
static u8 get_auth_method(struct smp_chan *smp, u8 local_io, u8 remote_io)
{
/* If either side has unknown io_caps, use JUST_CFM (which gets
* converted later to JUST_WORKS if we're initiators.
*/
if (local_io > SMP_IO_KEYBOARD_DISPLAY ||
remote_io > SMP_IO_KEYBOARD_DISPLAY)
return JUST_CFM;
if (test_bit(SMP_FLAG_SC, &smp->flags))
return sc_method[remote_io][local_io];
return gen_method[remote_io][local_io];
}
static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
u8 local_io, u8 remote_io)
{
struct hci_conn *hcon = conn->hcon;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
u32 passkey = 0;
int ret;
/* Initialize key for JUST WORKS */
memset(smp->tk, 0, sizeof(smp->tk));
clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io);
/* If neither side wants MITM, either "just" confirm an incoming
* request or use just-works for outgoing ones. The JUST_CFM
* will be converted to JUST_WORKS if necessary later in this
* function. If either side has MITM look up the method from the
* table.
*/
if (!(auth & SMP_AUTH_MITM))
smp->method = JUST_CFM;
else
smp->method = get_auth_method(smp, local_io, remote_io);
/* Don't confirm locally initiated pairing attempts */
if (smp->method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
&smp->flags))
smp->method = JUST_WORKS;
/* Don't bother user space with no IO capabilities */
if (smp->method == JUST_CFM &&
hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
smp->method = JUST_WORKS;
/* If Just Works, Continue with Zero TK and ask user-space for
* confirmation */
if (smp->method == JUST_WORKS) {
ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
hcon->type,
hcon->dst_type,
passkey, 1);
if (ret)
return ret;
set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
return 0;
}
/* If this function is used for SC -> legacy fallback we
* can only recover the just-works case.
*/
if (test_bit(SMP_FLAG_SC, &smp->flags))
return -EINVAL;
/* Not Just Works/Confirm results in MITM Authentication */
if (smp->method != JUST_CFM) {
set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
if (hcon->pending_sec_level < BT_SECURITY_HIGH)
hcon->pending_sec_level = BT_SECURITY_HIGH;
}
/* If both devices have Keyboard-Display I/O, the initiator
* Confirms and the responder Enters the passkey.
*/
if (smp->method == OVERLAP) {
if (hcon->role == HCI_ROLE_MASTER)
smp->method = CFM_PASSKEY;
else
smp->method = REQ_PASSKEY;
}
/* Generate random passkey. */
if (smp->method == CFM_PASSKEY) {
memset(smp->tk, 0, sizeof(smp->tk));
get_random_bytes(&passkey, sizeof(passkey));
passkey %= 1000000;
put_unaligned_le32(passkey, smp->tk);
BT_DBG("PassKey: %d", passkey);
set_bit(SMP_FLAG_TK_VALID, &smp->flags);
}
if (smp->method == REQ_PASSKEY)
ret = mgmt_user_passkey_request(hcon->hdev, &hcon->dst,
hcon->type, hcon->dst_type);
else if (smp->method == JUST_CFM)
ret = mgmt_user_confirm_request(hcon->hdev, &hcon->dst,
hcon->type, hcon->dst_type,
passkey, 1);
else
ret = mgmt_user_passkey_notify(hcon->hdev, &hcon->dst,
hcon->type, hcon->dst_type,
passkey, 0);
return ret;
}
static u8 smp_confirm(struct smp_chan *smp)
{
struct l2cap_conn *conn = smp->conn;
struct smp_cmd_pairing_confirm cp;
int ret;
BT_DBG("conn %p", conn);
ret = smp_c1(smp->tk, smp->prnd, smp->preq, smp->prsp,
conn->hcon->init_addr_type, &conn->hcon->init_addr,
conn->hcon->resp_addr_type, &conn->hcon->resp_addr,
cp.confirm_val);
if (ret)
return SMP_UNSPECIFIED;
clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
if (conn->hcon->out)
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
else
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
return 0;
}
static u8 smp_random(struct smp_chan *smp)
{
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
u8 confirm[16];
int ret;
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
ret = smp_c1(smp->tk, smp->rrnd, smp->preq, smp->prsp,
hcon->init_addr_type, &hcon->init_addr,
hcon->resp_addr_type, &hcon->resp_addr, confirm);
if (ret)
return SMP_UNSPECIFIED;
if (crypto_memneq(smp->pcnf, confirm, sizeof(smp->pcnf))) {
bt_dev_err(hcon->hdev, "pairing failed "
"(confirmation values mismatch)");
return SMP_CONFIRM_FAILED;
}
if (hcon->out) {
u8 stk[16];
__le64 rand = 0;
__le16 ediv = 0;
smp_s1(smp->tk, smp->rrnd, smp->prnd, stk);
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
return SMP_UNSPECIFIED;
hci_le_start_enc(hcon, ediv, rand, stk, smp->enc_key_size);
hcon->enc_key_size = smp->enc_key_size;
set_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
} else {
u8 stk[16], auth;
__le64 rand = 0;
__le16 ediv = 0;
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
smp->prnd);
smp_s1(smp->tk, smp->prnd, smp->rrnd, stk);
if (hcon->pending_sec_level == BT_SECURITY_HIGH)
auth = 1;
else
auth = 0;
/* Even though there's no _SLAVE suffix this is the
* slave STK we're adding for later lookup (the master
* STK never needs to be stored).
*/
hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
SMP_STK, auth, stk, smp->enc_key_size, ediv, rand);
}
return 0;
}
static void smp_notify_keys(struct l2cap_conn *conn)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
struct smp_cmd_pairing *req = (void *) &smp->preq[1];
struct smp_cmd_pairing *rsp = (void *) &smp->prsp[1];
bool persistent;
if (hcon->type == ACL_LINK) {
if (hcon->key_type == HCI_LK_DEBUG_COMBINATION)
persistent = false;
else
persistent = !test_bit(HCI_CONN_FLUSH_KEY,
&hcon->flags);
} else {
/* The LTKs, IRKs and CSRKs should be persistent only if
* both sides had the bonding bit set in their
* authentication requests.
*/
persistent = !!((req->auth_req & rsp->auth_req) &
SMP_AUTH_BONDING);
}
if (smp->remote_irk) {
mgmt_new_irk(hdev, smp->remote_irk, persistent);
/* Now that user space can be considered to know the
* identity address track the connection based on it
* from now on (assuming this is an LE link).
*/
if (hcon->type == LE_LINK) {
bacpy(&hcon->dst, &smp->remote_irk->bdaddr);
hcon->dst_type = smp->remote_irk->addr_type;
queue_work(hdev->workqueue, &conn->id_addr_update_work);
}
}
if (smp->csrk) {
smp->csrk->bdaddr_type = hcon->dst_type;
bacpy(&smp->csrk->bdaddr, &hcon->dst);
mgmt_new_csrk(hdev, smp->csrk, persistent);
}
if (smp->slave_csrk) {
smp->slave_csrk->bdaddr_type = hcon->dst_type;
bacpy(&smp->slave_csrk->bdaddr, &hcon->dst);
mgmt_new_csrk(hdev, smp->slave_csrk, persistent);
}
if (smp->ltk) {
smp->ltk->bdaddr_type = hcon->dst_type;
bacpy(&smp->ltk->bdaddr, &hcon->dst);
mgmt_new_ltk(hdev, smp->ltk, persistent);
}
if (smp->slave_ltk) {
smp->slave_ltk->bdaddr_type = hcon->dst_type;
bacpy(&smp->slave_ltk->bdaddr, &hcon->dst);
mgmt_new_ltk(hdev, smp->slave_ltk, persistent);
}
if (smp->link_key) {
struct link_key *key;
u8 type;
if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
type = HCI_LK_DEBUG_COMBINATION;
else if (hcon->sec_level == BT_SECURITY_FIPS)
type = HCI_LK_AUTH_COMBINATION_P256;
else
type = HCI_LK_UNAUTH_COMBINATION_P256;
key = hci_add_link_key(hdev, smp->conn->hcon, &hcon->dst,
smp->link_key, type, 0, &persistent);
if (key) {
mgmt_new_link_key(hdev, key, persistent);
/* Don't keep debug keys around if the relevant
* flag is not set.
*/
if (!hci_dev_test_flag(hdev, HCI_KEEP_DEBUG_KEYS) &&
key->type == HCI_LK_DEBUG_COMBINATION) {
list_del_rcu(&key->list);
kfree_rcu(key, rcu);
}
}
}
}
static void sc_add_ltk(struct smp_chan *smp)
{
struct hci_conn *hcon = smp->conn->hcon;
u8 key_type, auth;
if (test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags))
key_type = SMP_LTK_P256_DEBUG;
else
key_type = SMP_LTK_P256;
if (hcon->pending_sec_level == BT_SECURITY_FIPS)
auth = 1;
else
auth = 0;
smp->ltk = hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
key_type, auth, smp->tk, smp->enc_key_size,
0, 0);
}
static void sc_generate_link_key(struct smp_chan *smp)
{
/* From core spec. Spells out in ASCII as 'lebr'. */
const u8 lebr[4] = { 0x72, 0x62, 0x65, 0x6c };
smp->link_key = kzalloc(16, GFP_KERNEL);
if (!smp->link_key)
return;
if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
/* SALT = 0x000000000000000000000000746D7031 */
const u8 salt[16] = { 0x31, 0x70, 0x6d, 0x74 };
if (smp_h7(smp->tfm_cmac, smp->tk, salt, smp->link_key)) {
kfree_sensitive(smp->link_key);
smp->link_key = NULL;
return;
}
} else {
/* From core spec. Spells out in ASCII as 'tmp1'. */
const u8 tmp1[4] = { 0x31, 0x70, 0x6d, 0x74 };
if (smp_h6(smp->tfm_cmac, smp->tk, tmp1, smp->link_key)) {
kfree_sensitive(smp->link_key);
smp->link_key = NULL;
return;
}
}
if (smp_h6(smp->tfm_cmac, smp->link_key, lebr, smp->link_key)) {
kfree_sensitive(smp->link_key);
smp->link_key = NULL;
return;
}
}
static void smp_allow_key_dist(struct smp_chan *smp)
{
/* Allow the first expected phase 3 PDU. The rest of the PDUs
* will be allowed in each PDU handler to ensure we receive
* them in the correct order.
*/
if (smp->remote_key_dist & SMP_DIST_ENC_KEY)
SMP_ALLOW_CMD(smp, SMP_CMD_ENCRYPT_INFO);
else if (smp->remote_key_dist & SMP_DIST_ID_KEY)
SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
else if (smp->remote_key_dist & SMP_DIST_SIGN)
SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
}
static void sc_generate_ltk(struct smp_chan *smp)
{
/* From core spec. Spells out in ASCII as 'brle'. */
const u8 brle[4] = { 0x65, 0x6c, 0x72, 0x62 };
struct hci_conn *hcon = smp->conn->hcon;
struct hci_dev *hdev = hcon->hdev;
struct link_key *key;
key = hci_find_link_key(hdev, &hcon->dst);
if (!key) {
bt_dev_err(hdev, "no Link Key found to generate LTK");
return;
}
if (key->type == HCI_LK_DEBUG_COMBINATION)
set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
if (test_bit(SMP_FLAG_CT2, &smp->flags)) {
/* SALT = 0x000000000000000000000000746D7032 */
const u8 salt[16] = { 0x32, 0x70, 0x6d, 0x74 };
if (smp_h7(smp->tfm_cmac, key->val, salt, smp->tk))
return;
} else {
/* From core spec. Spells out in ASCII as 'tmp2'. */
const u8 tmp2[4] = { 0x32, 0x70, 0x6d, 0x74 };
if (smp_h6(smp->tfm_cmac, key->val, tmp2, smp->tk))
return;
}
if (smp_h6(smp->tfm_cmac, smp->tk, brle, smp->tk))
return;
sc_add_ltk(smp);
}
static void smp_distribute_keys(struct smp_chan *smp)
{
struct smp_cmd_pairing *req, *rsp;
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
__u8 *keydist;
BT_DBG("conn %p", conn);
rsp = (void *) &smp->prsp[1];
/* The responder sends its keys first */
if (hcon->out && (smp->remote_key_dist & KEY_DIST_MASK)) {
smp_allow_key_dist(smp);
return;
}
req = (void *) &smp->preq[1];
if (hcon->out) {
keydist = &rsp->init_key_dist;
*keydist &= req->init_key_dist;
} else {
keydist = &rsp->resp_key_dist;
*keydist &= req->resp_key_dist;
}
if (test_bit(SMP_FLAG_SC, &smp->flags)) {
if (hcon->type == LE_LINK && (*keydist & SMP_DIST_LINK_KEY))
sc_generate_link_key(smp);
if (hcon->type == ACL_LINK && (*keydist & SMP_DIST_ENC_KEY))
sc_generate_ltk(smp);
/* Clear the keys which are generated but not distributed */
*keydist &= ~SMP_SC_NO_DIST;
}
BT_DBG("keydist 0x%x", *keydist);
if (*keydist & SMP_DIST_ENC_KEY) {
struct smp_cmd_encrypt_info enc;
struct smp_cmd_master_ident ident;
struct smp_ltk *ltk;
u8 authenticated;
__le16 ediv;
__le64 rand;
/* Make sure we generate only the significant amount of
* bytes based on the encryption key size, and set the rest
* of the value to zeroes.
*/
get_random_bytes(enc.ltk, smp->enc_key_size);
memset(enc.ltk + smp->enc_key_size, 0,
sizeof(enc.ltk) - smp->enc_key_size);
get_random_bytes(&ediv, sizeof(ediv));
get_random_bytes(&rand, sizeof(rand));
smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
authenticated = hcon->sec_level == BT_SECURITY_HIGH;
ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type,
SMP_LTK_SLAVE, authenticated, enc.ltk,
smp->enc_key_size, ediv, rand);
smp->slave_ltk = ltk;
ident.ediv = ediv;
ident.rand = rand;
smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident);
*keydist &= ~SMP_DIST_ENC_KEY;
}
if (*keydist & SMP_DIST_ID_KEY) {
struct smp_cmd_ident_addr_info addrinfo;
struct smp_cmd_ident_info idinfo;
memcpy(idinfo.irk, hdev->irk, sizeof(idinfo.irk));
smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
/* The hci_conn contains the local identity address
* after the connection has been established.
*
* This is true even when the connection has been
* established using a resolvable random address.
*/
bacpy(&addrinfo.bdaddr, &hcon->src);
addrinfo.addr_type = hcon->src_type;
smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
&addrinfo);
*keydist &= ~SMP_DIST_ID_KEY;
}
if (*keydist & SMP_DIST_SIGN) {
struct smp_cmd_sign_info sign;
struct smp_csrk *csrk;
/* Generate a new random key */
get_random_bytes(sign.csrk, sizeof(sign.csrk));
csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
if (csrk) {
if (hcon->sec_level > BT_SECURITY_MEDIUM)
csrk->type = MGMT_CSRK_LOCAL_AUTHENTICATED;
else
csrk->type = MGMT_CSRK_LOCAL_UNAUTHENTICATED;
memcpy(csrk->val, sign.csrk, sizeof(csrk->val));
}
smp->slave_csrk = csrk;
smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
*keydist &= ~SMP_DIST_SIGN;
}
/* If there are still keys to be received wait for them */
if (smp->remote_key_dist & KEY_DIST_MASK) {
smp_allow_key_dist(smp);
return;
}
set_bit(SMP_FLAG_COMPLETE, &smp->flags);
smp_notify_keys(conn);
smp_chan_destroy(conn);
}
static void smp_timeout(struct work_struct *work)
{
struct smp_chan *smp = container_of(work, struct smp_chan,
security_timer.work);
struct l2cap_conn *conn = smp->conn;
BT_DBG("conn %p", conn);
hci_disconnect(conn->hcon, HCI_ERROR_REMOTE_USER_TERM);
}
static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp;
smp = kzalloc(sizeof(*smp), GFP_ATOMIC);
if (!smp)
return NULL;
smp->tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
if (IS_ERR(smp->tfm_cmac)) {
BT_ERR("Unable to create CMAC crypto context");
goto zfree_smp;
}
smp->tfm_ecdh = crypto_alloc_kpp("ecdh", 0, 0);
if (IS_ERR(smp->tfm_ecdh)) {
BT_ERR("Unable to create ECDH crypto context");
goto free_shash;
}
smp->conn = conn;
chan->data = smp;
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_FAIL);
INIT_DELAYED_WORK(&smp->security_timer, smp_timeout);
hci_conn_hold(conn->hcon);
return smp;
free_shash:
crypto_free_shash(smp->tfm_cmac);
zfree_smp:
kfree_sensitive(smp);
return NULL;
}
static int sc_mackey_and_ltk(struct smp_chan *smp, u8 mackey[16], u8 ltk[16])
{
struct hci_conn *hcon = smp->conn->hcon;
u8 *na, *nb, a[7], b[7];
if (hcon->out) {
na = smp->prnd;
nb = smp->rrnd;
} else {
na = smp->rrnd;
nb = smp->prnd;
}
memcpy(a, &hcon->init_addr, 6);
memcpy(b, &hcon->resp_addr, 6);
a[6] = hcon->init_addr_type;
b[6] = hcon->resp_addr_type;
return smp_f5(smp->tfm_cmac, smp->dhkey, na, nb, a, b, mackey, ltk);
}
static void sc_dhkey_check(struct smp_chan *smp)
{
struct hci_conn *hcon = smp->conn->hcon;
struct smp_cmd_dhkey_check check;
u8 a[7], b[7], *local_addr, *remote_addr;
u8 io_cap[3], r[16];
memcpy(a, &hcon->init_addr, 6);
memcpy(b, &hcon->resp_addr, 6);
a[6] = hcon->init_addr_type;
b[6] = hcon->resp_addr_type;
if (hcon->out) {
local_addr = a;
remote_addr = b;
memcpy(io_cap, &smp->preq[1], 3);
} else {
local_addr = b;
remote_addr = a;
memcpy(io_cap, &smp->prsp[1], 3);
}
memset(r, 0, sizeof(r));
if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
put_unaligned_le32(hcon->passkey_notify, r);
if (smp->method == REQ_OOB)
memcpy(r, smp->rr, 16);
smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
local_addr, remote_addr, check.e);
smp_send_cmd(smp->conn, SMP_CMD_DHKEY_CHECK, sizeof(check), &check);
}
static u8 sc_passkey_send_confirm(struct smp_chan *smp)
{
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
struct smp_cmd_pairing_confirm cfm;
u8 r;
r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
r |= 0x80;
get_random_bytes(smp->prnd, sizeof(smp->prnd));
if (smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd, r,
cfm.confirm_val))
return SMP_UNSPECIFIED;
smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
return 0;
}
static u8 sc_passkey_round(struct smp_chan *smp, u8 smp_op)
{
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
u8 cfm[16], r;
/* Ignore the PDU if we've already done 20 rounds (0 - 19) */
if (smp->passkey_round >= 20)
return 0;
switch (smp_op) {
case SMP_CMD_PAIRING_RANDOM:
r = ((hcon->passkey_notify >> smp->passkey_round) & 0x01);
r |= 0x80;
if (smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
smp->rrnd, r, cfm))
return SMP_UNSPECIFIED;
if (crypto_memneq(smp->pcnf, cfm, 16))
return SMP_CONFIRM_FAILED;
smp->passkey_round++;
if (smp->passkey_round == 20) {
/* Generate MacKey and LTK */
if (sc_mackey_and_ltk(smp, smp->mackey, smp->tk))
return SMP_UNSPECIFIED;
}
/* The round is only complete when the initiator
* receives pairing random.
*/
if (!hcon->out) {
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
sizeof(smp->prnd), smp->prnd);
if (smp->passkey_round == 20)
SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
else
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
return 0;
}
/* Start the next round */
if (smp->passkey_round != 20)
return sc_passkey_round(smp, 0);
/* Passkey rounds are complete - start DHKey Check */
sc_dhkey_check(smp);
SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
break;
case SMP_CMD_PAIRING_CONFIRM:
if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
return 0;
}
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
if (hcon->out) {
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
sizeof(smp->prnd), smp->prnd);
return 0;
}
return sc_passkey_send_confirm(smp);
case SMP_CMD_PUBLIC_KEY:
default:
/* Initiating device starts the round */
if (!hcon->out)
return 0;
BT_DBG("%s Starting passkey round %u", hdev->name,
smp->passkey_round + 1);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
return sc_passkey_send_confirm(smp);
}
return 0;
}
static int sc_user_reply(struct smp_chan *smp, u16 mgmt_op, __le32 passkey)
{
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
u8 smp_op;
clear_bit(SMP_FLAG_WAIT_USER, &smp->flags);
switch (mgmt_op) {
case MGMT_OP_USER_PASSKEY_NEG_REPLY:
smp_failure(smp->conn, SMP_PASSKEY_ENTRY_FAILED);
return 0;
case MGMT_OP_USER_CONFIRM_NEG_REPLY:
smp_failure(smp->conn, SMP_NUMERIC_COMP_FAILED);
return 0;
case MGMT_OP_USER_PASSKEY_REPLY:
hcon->passkey_notify = le32_to_cpu(passkey);
smp->passkey_round = 0;
if (test_and_clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags))
smp_op = SMP_CMD_PAIRING_CONFIRM;
else
smp_op = 0;
if (sc_passkey_round(smp, smp_op))
return -EIO;
return 0;
}
/* Initiator sends DHKey check first */
if (hcon->out) {
sc_dhkey_check(smp);
SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
} else if (test_and_clear_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags)) {
sc_dhkey_check(smp);
sc_add_ltk(smp);
}
return 0;
}
int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
{
struct l2cap_conn *conn = hcon->l2cap_data;
struct l2cap_chan *chan;
struct smp_chan *smp;
u32 value;
int err;
BT_DBG("");
if (!conn)
return -ENOTCONN;
chan = conn->smp;
if (!chan)
return -ENOTCONN;
l2cap_chan_lock(chan);
if (!chan->data) {
err = -ENOTCONN;
goto unlock;
}
smp = chan->data;
if (test_bit(SMP_FLAG_SC, &smp->flags)) {
err = sc_user_reply(smp, mgmt_op, passkey);
goto unlock;
}
switch (mgmt_op) {
case MGMT_OP_USER_PASSKEY_REPLY:
value = le32_to_cpu(passkey);
memset(smp->tk, 0, sizeof(smp->tk));
BT_DBG("PassKey: %d", value);
put_unaligned_le32(value, smp->tk);
fallthrough;
case MGMT_OP_USER_CONFIRM_REPLY:
set_bit(SMP_FLAG_TK_VALID, &smp->flags);
break;
case MGMT_OP_USER_PASSKEY_NEG_REPLY:
case MGMT_OP_USER_CONFIRM_NEG_REPLY:
smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
err = 0;
goto unlock;
default:
smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED);
err = -EOPNOTSUPP;
goto unlock;
}
err = 0;
/* If it is our turn to send Pairing Confirm, do so now */
if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
u8 rsp = smp_confirm(smp);
if (rsp)
smp_failure(conn, rsp);
}
unlock:
l2cap_chan_unlock(chan);
return err;
}
static void build_bredr_pairing_cmd(struct smp_chan *smp,
struct smp_cmd_pairing *req,
struct smp_cmd_pairing *rsp)
{
struct l2cap_conn *conn = smp->conn;
struct hci_dev *hdev = conn->hcon->hdev;
u8 local_dist = 0, remote_dist = 0;
if (hci_dev_test_flag(hdev, HCI_BONDABLE)) {
local_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
remote_dist = SMP_DIST_ENC_KEY | SMP_DIST_SIGN;
}
if (hci_dev_test_flag(hdev, HCI_RPA_RESOLVING))
remote_dist |= SMP_DIST_ID_KEY;
if (hci_dev_test_flag(hdev, HCI_PRIVACY))
local_dist |= SMP_DIST_ID_KEY;
if (!rsp) {
memset(req, 0, sizeof(*req));
req->auth_req = SMP_AUTH_CT2;
req->init_key_dist = local_dist;
req->resp_key_dist = remote_dist;
req->max_key_size = conn->hcon->enc_key_size;
smp->remote_key_dist = remote_dist;
return;
}
memset(rsp, 0, sizeof(*rsp));
rsp->auth_req = SMP_AUTH_CT2;
rsp->max_key_size = conn->hcon->enc_key_size;
rsp->init_key_dist = req->init_key_dist & remote_dist;
rsp->resp_key_dist = req->resp_key_dist & local_dist;
smp->remote_key_dist = rsp->init_key_dist;
}
static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_pairing rsp, *req = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct hci_dev *hdev = conn->hcon->hdev;
struct smp_chan *smp;
u8 key_size, auth, sec_level;
int ret;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*req))
return SMP_INVALID_PARAMS;
if (conn->hcon->role != HCI_ROLE_SLAVE)
return SMP_CMD_NOTSUPP;
if (!chan->data)
smp = smp_chan_create(conn);
else
smp = chan->data;
if (!smp)
return SMP_UNSPECIFIED;
/* We didn't start the pairing, so match remote */
auth = req->auth_req & AUTH_REQ_MASK(hdev);
if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
(auth & SMP_AUTH_BONDING))
return SMP_PAIRING_NOTSUPP;
if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
return SMP_AUTH_REQUIREMENTS;
smp->preq[0] = SMP_CMD_PAIRING_REQ;
memcpy(&smp->preq[1], req, sizeof(*req));
skb_pull(skb, sizeof(*req));
/* If the remote side's OOB flag is set it means it has
* successfully received our local OOB data - therefore set the
* flag to indicate that local OOB is in use.
*/
if (req->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob)
set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
/* SMP over BR/EDR requires special treatment */
if (conn->hcon->type == ACL_LINK) {
/* We must have a BR/EDR SC link */
if (!test_bit(HCI_CONN_AES_CCM, &conn->hcon->flags) &&
!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
return SMP_CROSS_TRANSP_NOT_ALLOWED;
set_bit(SMP_FLAG_SC, &smp->flags);
build_bredr_pairing_cmd(smp, req, &rsp);
if (req->auth_req & SMP_AUTH_CT2)
set_bit(SMP_FLAG_CT2, &smp->flags);
key_size = min(req->max_key_size, rsp.max_key_size);
if (check_enc_key_size(conn, key_size))
return SMP_ENC_KEY_SIZE;
/* Clear bits which are generated but not distributed */
smp->remote_key_dist &= ~SMP_SC_NO_DIST;
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
smp_distribute_keys(smp);
return 0;
}
build_pairing_cmd(conn, req, &rsp, auth);
if (rsp.auth_req & SMP_AUTH_SC) {
set_bit(SMP_FLAG_SC, &smp->flags);
if (rsp.auth_req & SMP_AUTH_CT2)
set_bit(SMP_FLAG_CT2, &smp->flags);
}
if (conn->hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
sec_level = BT_SECURITY_MEDIUM;
else
sec_level = authreq_to_seclevel(auth);
if (sec_level > conn->hcon->pending_sec_level)
conn->hcon->pending_sec_level = sec_level;
/* If we need MITM check that it can be achieved */
if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
u8 method;
method = get_auth_method(smp, conn->hcon->io_capability,
req->io_capability);
if (method == JUST_WORKS || method == JUST_CFM)
return SMP_AUTH_REQUIREMENTS;
}
key_size = min(req->max_key_size, rsp.max_key_size);
if (check_enc_key_size(conn, key_size))
return SMP_ENC_KEY_SIZE;
get_random_bytes(smp->prnd, sizeof(smp->prnd));
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
/* Strictly speaking we shouldn't allow Pairing Confirm for the
* SC case, however some implementations incorrectly copy RFU auth
* req bits from our security request, which may create a false
* positive SC enablement.
*/
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
if (test_bit(SMP_FLAG_SC, &smp->flags)) {
SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
/* Clear bits which are generated but not distributed */
smp->remote_key_dist &= ~SMP_SC_NO_DIST;
/* Wait for Public Key from Initiating Device */
return 0;
}
/* Request setup of TK */
ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
if (ret)
return SMP_UNSPECIFIED;
return 0;
}
static u8 sc_send_public_key(struct smp_chan *smp)
{
struct hci_dev *hdev = smp->conn->hcon->hdev;
bt_dev_dbg(hdev, "");
if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
struct l2cap_chan *chan = hdev->smp_data;
struct smp_dev *smp_dev;
if (!chan || !chan->data)
return SMP_UNSPECIFIED;
smp_dev = chan->data;
memcpy(smp->local_pk, smp_dev->local_pk, 64);
memcpy(smp->lr, smp_dev->local_rand, 16);
if (smp_dev->debug_key)
set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
goto done;
}
if (hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
BT_DBG("Using debug keys");
if (set_ecdh_privkey(smp->tfm_ecdh, debug_sk))
return SMP_UNSPECIFIED;
memcpy(smp->local_pk, debug_pk, 64);
set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
} else {
while (true) {
/* Generate key pair for Secure Connections */
if (generate_ecdh_keys(smp->tfm_ecdh, smp->local_pk))
return SMP_UNSPECIFIED;
/* This is unlikely, but we need to check that
* we didn't accidentially generate a debug key.
*/
if (crypto_memneq(smp->local_pk, debug_pk, 64))
break;
}
}
done:
SMP_DBG("Local Public Key X: %32phN", smp->local_pk);
SMP_DBG("Local Public Key Y: %32phN", smp->local_pk + 32);
smp_send_cmd(smp->conn, SMP_CMD_PUBLIC_KEY, 64, smp->local_pk);
return 0;
}
static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_dev *hdev = conn->hcon->hdev;
u8 key_size, auth;
int ret;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rsp))
return SMP_INVALID_PARAMS;
if (conn->hcon->role != HCI_ROLE_MASTER)
return SMP_CMD_NOTSUPP;
skb_pull(skb, sizeof(*rsp));
req = (void *) &smp->preq[1];
key_size = min(req->max_key_size, rsp->max_key_size);
if (check_enc_key_size(conn, key_size))
return SMP_ENC_KEY_SIZE;
auth = rsp->auth_req & AUTH_REQ_MASK(hdev);
if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
return SMP_AUTH_REQUIREMENTS;
/* If the remote side's OOB flag is set it means it has
* successfully received our local OOB data - therefore set the
* flag to indicate that local OOB is in use.
*/
if (rsp->oob_flag == SMP_OOB_PRESENT && SMP_DEV(hdev)->local_oob)
set_bit(SMP_FLAG_LOCAL_OOB, &smp->flags);
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
/* Update remote key distribution in case the remote cleared
* some bits that we had enabled in our request.
*/
smp->remote_key_dist &= rsp->resp_key_dist;
if ((req->auth_req & SMP_AUTH_CT2) && (auth & SMP_AUTH_CT2))
set_bit(SMP_FLAG_CT2, &smp->flags);
/* For BR/EDR this means we're done and can start phase 3 */
if (conn->hcon->type == ACL_LINK) {
/* Clear bits which are generated but not distributed */
smp->remote_key_dist &= ~SMP_SC_NO_DIST;
smp_distribute_keys(smp);
return 0;
}
if ((req->auth_req & SMP_AUTH_SC) && (auth & SMP_AUTH_SC))
set_bit(SMP_FLAG_SC, &smp->flags);
else if (conn->hcon->pending_sec_level > BT_SECURITY_HIGH)
conn->hcon->pending_sec_level = BT_SECURITY_HIGH;
/* If we need MITM check that it can be achieved */
if (conn->hcon->pending_sec_level >= BT_SECURITY_HIGH) {
u8 method;
method = get_auth_method(smp, req->io_capability,
rsp->io_capability);
if (method == JUST_WORKS || method == JUST_CFM)
return SMP_AUTH_REQUIREMENTS;
}
get_random_bytes(smp->prnd, sizeof(smp->prnd));
/* Update remote key distribution in case the remote cleared
* some bits that we had enabled in our request.
*/
smp->remote_key_dist &= rsp->resp_key_dist;
if (test_bit(SMP_FLAG_SC, &smp->flags)) {
/* Clear bits which are generated but not distributed */
smp->remote_key_dist &= ~SMP_SC_NO_DIST;
SMP_ALLOW_CMD(smp, SMP_CMD_PUBLIC_KEY);
return sc_send_public_key(smp);
}
auth |= req->auth_req;
ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
if (ret)
return SMP_UNSPECIFIED;
set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
/* Can't compose response until we have been confirmed */
if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
return smp_confirm(smp);
return 0;
}
static u8 sc_check_confirm(struct smp_chan *smp)
{
struct l2cap_conn *conn = smp->conn;
BT_DBG("");
if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
return sc_passkey_round(smp, SMP_CMD_PAIRING_CONFIRM);
if (conn->hcon->out) {
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
smp->prnd);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
}
return 0;
}
/* Work-around for some implementations that incorrectly copy RFU bits
* from our security request and thereby create the impression that
* we're doing SC when in fact the remote doesn't support it.
*/
static int fixup_sc_false_positive(struct smp_chan *smp)
{
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
struct smp_cmd_pairing *req, *rsp;
u8 auth;
/* The issue is only observed when we're in slave role */
if (hcon->out)
return SMP_UNSPECIFIED;
if (hci_dev_test_flag(hdev, HCI_SC_ONLY)) {
bt_dev_err(hdev, "refusing legacy fallback in SC-only mode");
return SMP_UNSPECIFIED;
}
bt_dev_err(hdev, "trying to fall back to legacy SMP");
req = (void *) &smp->preq[1];
rsp = (void *) &smp->prsp[1];
/* Rebuild key dist flags which may have been cleared for SC */
smp->remote_key_dist = (req->init_key_dist & rsp->resp_key_dist);
auth = req->auth_req & AUTH_REQ_MASK(hdev);
if (tk_request(conn, 0, auth, rsp->io_capability, req->io_capability)) {
bt_dev_err(hdev, "failed to fall back to legacy SMP");
return SMP_UNSPECIFIED;
}
clear_bit(SMP_FLAG_SC, &smp->flags);
return 0;
}
static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
if (skb->len < sizeof(smp->pcnf))
return SMP_INVALID_PARAMS;
memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
skb_pull(skb, sizeof(smp->pcnf));
if (test_bit(SMP_FLAG_SC, &smp->flags)) {
int ret;
/* Public Key exchange must happen before any other steps */
if (test_bit(SMP_FLAG_REMOTE_PK, &smp->flags))
return sc_check_confirm(smp);
BT_ERR("Unexpected SMP Pairing Confirm");
ret = fixup_sc_false_positive(smp);
if (ret)
return ret;
}
if (conn->hcon->out) {
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
smp->prnd);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
return 0;
}
if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
return smp_confirm(smp);
set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
return 0;
}
static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_conn *hcon = conn->hcon;
u8 *pkax, *pkbx, *na, *nb, confirm_hint;
u32 passkey;
int err;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(smp->rrnd))
return SMP_INVALID_PARAMS;
memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
skb_pull(skb, sizeof(smp->rrnd));
if (!test_bit(SMP_FLAG_SC, &smp->flags))
return smp_random(smp);
if (hcon->out) {
pkax = smp->local_pk;
pkbx = smp->remote_pk;
na = smp->prnd;
nb = smp->rrnd;
} else {
pkax = smp->remote_pk;
pkbx = smp->local_pk;
na = smp->rrnd;
nb = smp->prnd;
}
if (smp->method == REQ_OOB) {
if (!hcon->out)
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
sizeof(smp->prnd), smp->prnd);
SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
goto mackey_and_ltk;
}
/* Passkey entry has special treatment */
if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
if (hcon->out) {
u8 cfm[16];
err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->local_pk,
smp->rrnd, 0, cfm);
if (err)
return SMP_UNSPECIFIED;
if (crypto_memneq(smp->pcnf, cfm, 16))
return SMP_CONFIRM_FAILED;
} else {
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
smp->prnd);
SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
/* Only Just-Works pairing requires extra checks */
if (smp->method != JUST_WORKS)
goto mackey_and_ltk;
/* If there already exists long term key in local host, leave
* the decision to user space since the remote device could
* be legitimate or malicious.
*/
if (hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
hcon->role)) {
/* Set passkey to 0. The value can be any number since
* it'll be ignored anyway.
*/
passkey = 0;
confirm_hint = 1;
goto confirm;
}
}
mackey_and_ltk:
/* Generate MacKey and LTK */
err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
if (err)
return SMP_UNSPECIFIED;
if (smp->method == REQ_OOB) {
if (hcon->out) {
sc_dhkey_check(smp);
SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
}
return 0;
}
err = smp_g2(smp->tfm_cmac, pkax, pkbx, na, nb, &passkey);
if (err)
return SMP_UNSPECIFIED;
confirm_hint = 0;
confirm:
if (smp->method == JUST_WORKS)
confirm_hint = 1;
err = mgmt_user_confirm_request(hcon->hdev, &hcon->dst, hcon->type,
hcon->dst_type, passkey, confirm_hint);
if (err)
return SMP_UNSPECIFIED;
set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
return 0;
}
static bool smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
{
struct smp_ltk *key;
struct hci_conn *hcon = conn->hcon;
key = hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role);
if (!key)
return false;
if (smp_ltk_sec_level(key) < sec_level)
return false;
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
return true;
hci_le_start_enc(hcon, key->ediv, key->rand, key->val, key->enc_size);
hcon->enc_key_size = key->enc_size;
/* We never store STKs for master role, so clear this flag */
clear_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags);
return true;
}
bool smp_sufficient_security(struct hci_conn *hcon, u8 sec_level,
enum smp_key_pref key_pref)
{
if (sec_level == BT_SECURITY_LOW)
return true;
/* If we're encrypted with an STK but the caller prefers using
* LTK claim insufficient security. This way we allow the
* connection to be re-encrypted with an LTK, even if the LTK
* provides the same level of security. Only exception is if we
* don't have an LTK (e.g. because of key distribution bits).
*/
if (key_pref == SMP_USE_LTK &&
test_bit(HCI_CONN_STK_ENCRYPT, &hcon->flags) &&
hci_find_ltk(hcon->hdev, &hcon->dst, hcon->dst_type, hcon->role))
return false;
if (hcon->sec_level >= sec_level)
return true;
return false;
}
static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_security_req *rp = (void *) skb->data;
struct smp_cmd_pairing cp;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
struct smp_chan *smp;
u8 sec_level, auth;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
return SMP_INVALID_PARAMS;
if (hcon->role != HCI_ROLE_MASTER)
return SMP_CMD_NOTSUPP;
auth = rp->auth_req & AUTH_REQ_MASK(hdev);
if (hci_dev_test_flag(hdev, HCI_SC_ONLY) && !(auth & SMP_AUTH_SC))
return SMP_AUTH_REQUIREMENTS;
if (hcon->io_capability == HCI_IO_NO_INPUT_OUTPUT)
sec_level = BT_SECURITY_MEDIUM;
else
sec_level = authreq_to_seclevel(auth);
if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK)) {
/* If link is already encrypted with sufficient security we
* still need refresh encryption as per Core Spec 5.0 Vol 3,
* Part H 2.4.6
*/
smp_ltk_encrypt(conn, hcon->sec_level);
return 0;
}
if (sec_level > hcon->pending_sec_level)
hcon->pending_sec_level = sec_level;
if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
return 0;
smp = smp_chan_create(conn);
if (!smp)
return SMP_UNSPECIFIED;
if (!hci_dev_test_flag(hdev, HCI_BONDABLE) &&
(auth & SMP_AUTH_BONDING))
return SMP_PAIRING_NOTSUPP;
skb_pull(skb, sizeof(*rp));
memset(&cp, 0, sizeof(cp));
build_pairing_cmd(conn, &cp, NULL, auth);
smp->preq[0] = SMP_CMD_PAIRING_REQ;
memcpy(&smp->preq[1], &cp, sizeof(cp));
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
return 0;
}
int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
{
struct l2cap_conn *conn = hcon->l2cap_data;
struct l2cap_chan *chan;
struct smp_chan *smp;
__u8 authreq;
int ret;
BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
/* This may be NULL if there's an unexpected disconnection */
if (!conn)
return 1;
if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED))
return 1;
if (smp_sufficient_security(hcon, sec_level, SMP_USE_LTK))
return 1;
if (sec_level > hcon->pending_sec_level)
hcon->pending_sec_level = sec_level;
if (hcon->role == HCI_ROLE_MASTER)
if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
return 0;
chan = conn->smp;
if (!chan) {
bt_dev_err(hcon->hdev, "security requested but not available");
return 1;
}
l2cap_chan_lock(chan);
/* If SMP is already in progress ignore this request */
if (chan->data) {
ret = 0;
goto unlock;
}
smp = smp_chan_create(conn);
if (!smp) {
ret = 1;
goto unlock;
}
authreq = seclevel_to_authreq(sec_level);
if (hci_dev_test_flag(hcon->hdev, HCI_SC_ENABLED)) {
authreq |= SMP_AUTH_SC;
if (hci_dev_test_flag(hcon->hdev, HCI_SSP_ENABLED))
authreq |= SMP_AUTH_CT2;
}
/* Don't attempt to set MITM if setting is overridden by debugfs
* Needed to pass certification test SM/MAS/PKE/BV-01-C
*/
if (!hci_dev_test_flag(hcon->hdev, HCI_FORCE_NO_MITM)) {
/* Require MITM if IO Capability allows or the security level
* requires it.
*/
if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
hcon->pending_sec_level > BT_SECURITY_MEDIUM)
authreq |= SMP_AUTH_MITM;
}
if (hcon->role == HCI_ROLE_MASTER) {
struct smp_cmd_pairing cp;
build_pairing_cmd(conn, &cp, NULL, authreq);
smp->preq[0] = SMP_CMD_PAIRING_REQ;
memcpy(&smp->preq[1], &cp, sizeof(cp));
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
} else {
struct smp_cmd_security_req cp;
cp.auth_req = authreq;
smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_REQ);
}
set_bit(SMP_FLAG_INITIATOR, &smp->flags);
ret = 0;
unlock:
l2cap_chan_unlock(chan);
return ret;
}
int smp_cancel_and_remove_pairing(struct hci_dev *hdev, bdaddr_t *bdaddr,
u8 addr_type)
{
struct hci_conn *hcon;
struct l2cap_conn *conn;
struct l2cap_chan *chan;
struct smp_chan *smp;
int err;
err = hci_remove_ltk(hdev, bdaddr, addr_type);
hci_remove_irk(hdev, bdaddr, addr_type);
hcon = hci_conn_hash_lookup_le(hdev, bdaddr, addr_type);
if (!hcon)
goto done;
conn = hcon->l2cap_data;
if (!conn)
goto done;
chan = conn->smp;
if (!chan)
goto done;
l2cap_chan_lock(chan);
smp = chan->data;
if (smp) {
/* Set keys to NULL to make sure smp_failure() does not try to
* remove and free already invalidated rcu list entries. */
smp->ltk = NULL;
smp->slave_ltk = NULL;
smp->remote_irk = NULL;
if (test_bit(SMP_FLAG_COMPLETE, &smp->flags))
smp_failure(conn, 0);
else
smp_failure(conn, SMP_UNSPECIFIED);
err = 0;
}
l2cap_chan_unlock(chan);
done:
return err;
}
static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_encrypt_info *rp = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
return SMP_INVALID_PARAMS;
/* Pairing is aborted if any blocked keys are distributed */
if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_LTK,
rp->ltk)) {
bt_dev_warn_ratelimited(conn->hcon->hdev,
"LTK blocked for %pMR",
&conn->hcon->dst);
return SMP_INVALID_PARAMS;
}
SMP_ALLOW_CMD(smp, SMP_CMD_MASTER_IDENT);
skb_pull(skb, sizeof(*rp));
memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
return 0;
}
static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_master_ident *rp = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_dev *hdev = conn->hcon->hdev;
struct hci_conn *hcon = conn->hcon;
struct smp_ltk *ltk;
u8 authenticated;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
return SMP_INVALID_PARAMS;
/* Mark the information as received */
smp->remote_key_dist &= ~SMP_DIST_ENC_KEY;
if (smp->remote_key_dist & SMP_DIST_ID_KEY)
SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_INFO);
else if (smp->remote_key_dist & SMP_DIST_SIGN)
SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
skb_pull(skb, sizeof(*rp));
authenticated = (hcon->sec_level == BT_SECURITY_HIGH);
ltk = hci_add_ltk(hdev, &hcon->dst, hcon->dst_type, SMP_LTK,
authenticated, smp->tk, smp->enc_key_size,
rp->ediv, rp->rand);
smp->ltk = ltk;
if (!(smp->remote_key_dist & KEY_DIST_MASK))
smp_distribute_keys(smp);
return 0;
}
static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_ident_info *info = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
BT_DBG("");
if (skb->len < sizeof(*info))
return SMP_INVALID_PARAMS;
/* Pairing is aborted if any blocked keys are distributed */
if (hci_is_blocked_key(conn->hcon->hdev, HCI_BLOCKED_KEY_TYPE_IRK,
info->irk)) {
bt_dev_warn_ratelimited(conn->hcon->hdev,
"Identity key blocked for %pMR",
&conn->hcon->dst);
return SMP_INVALID_PARAMS;
}
SMP_ALLOW_CMD(smp, SMP_CMD_IDENT_ADDR_INFO);
skb_pull(skb, sizeof(*info));
memcpy(smp->irk, info->irk, 16);
return 0;
}
static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
struct sk_buff *skb)
{
struct smp_cmd_ident_addr_info *info = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_conn *hcon = conn->hcon;
bdaddr_t rpa;
BT_DBG("");
if (skb->len < sizeof(*info))
return SMP_INVALID_PARAMS;
/* Mark the information as received */
smp->remote_key_dist &= ~SMP_DIST_ID_KEY;
if (smp->remote_key_dist & SMP_DIST_SIGN)
SMP_ALLOW_CMD(smp, SMP_CMD_SIGN_INFO);
skb_pull(skb, sizeof(*info));
/* Strictly speaking the Core Specification (4.1) allows sending
* an empty address which would force us to rely on just the IRK
* as "identity information". However, since such
* implementations are not known of and in order to not over
* complicate our implementation, simply pretend that we never
* received an IRK for such a device.
*
* The Identity Address must also be a Static Random or Public
* Address, which hci_is_identity_address() checks for.
*/
if (!bacmp(&info->bdaddr, BDADDR_ANY) ||
!hci_is_identity_address(&info->bdaddr, info->addr_type)) {
bt_dev_err(hcon->hdev, "ignoring IRK with no identity address");
goto distribute;
}
/* Drop IRK if peer is using identity address during pairing but is
* providing different address as identity information.
*
* Microsoft Surface Precision Mouse is known to have this bug.
*/
if (hci_is_identity_address(&hcon->dst, hcon->dst_type) &&
(bacmp(&info->bdaddr, &hcon->dst) ||
info->addr_type != hcon->dst_type)) {
bt_dev_err(hcon->hdev,
"ignoring IRK with invalid identity address");
goto distribute;
}
bacpy(&smp->id_addr, &info->bdaddr);
smp->id_addr_type = info->addr_type;
if (hci_bdaddr_is_rpa(&hcon->dst, hcon->dst_type))
bacpy(&rpa, &hcon->dst);
else
bacpy(&rpa, BDADDR_ANY);
smp->remote_irk = hci_add_irk(conn->hcon->hdev, &smp->id_addr,
smp->id_addr_type, smp->irk, &rpa);
distribute:
if (!(smp->remote_key_dist & KEY_DIST_MASK))
smp_distribute_keys(smp);
return 0;
}
static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_sign_info *rp = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct smp_csrk *csrk;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
return SMP_INVALID_PARAMS;
/* Mark the information as received */
smp->remote_key_dist &= ~SMP_DIST_SIGN;
skb_pull(skb, sizeof(*rp));
csrk = kzalloc(sizeof(*csrk), GFP_KERNEL);
if (csrk) {
if (conn->hcon->sec_level > BT_SECURITY_MEDIUM)
csrk->type = MGMT_CSRK_REMOTE_AUTHENTICATED;
else
csrk->type = MGMT_CSRK_REMOTE_UNAUTHENTICATED;
memcpy(csrk->val, rp->csrk, sizeof(csrk->val));
}
smp->csrk = csrk;
smp_distribute_keys(smp);
return 0;
}
static u8 sc_select_method(struct smp_chan *smp)
{
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
struct smp_cmd_pairing *local, *remote;
u8 local_mitm, remote_mitm, local_io, remote_io, method;
if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags) ||
test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags))
return REQ_OOB;
/* The preq/prsp contain the raw Pairing Request/Response PDUs
* which are needed as inputs to some crypto functions. To get
* the "struct smp_cmd_pairing" from them we need to skip the
* first byte which contains the opcode.
*/
if (hcon->out) {
local = (void *) &smp->preq[1];
remote = (void *) &smp->prsp[1];
} else {
local = (void *) &smp->prsp[1];
remote = (void *) &smp->preq[1];
}
local_io = local->io_capability;
remote_io = remote->io_capability;
local_mitm = (local->auth_req & SMP_AUTH_MITM);
remote_mitm = (remote->auth_req & SMP_AUTH_MITM);
/* If either side wants MITM, look up the method from the table,
* otherwise use JUST WORKS.
*/
if (local_mitm || remote_mitm)
method = get_auth_method(smp, local_io, remote_io);
else
method = JUST_WORKS;
/* Don't confirm locally initiated pairing attempts */
if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
method = JUST_WORKS;
return method;
}
static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_public_key *key = (void *) skb->data;
struct hci_conn *hcon = conn->hcon;
struct l2cap_chan *chan = conn->smp;
struct smp_chan *smp = chan->data;
struct hci_dev *hdev = hcon->hdev;
struct crypto_kpp *tfm_ecdh;
struct smp_cmd_pairing_confirm cfm;
int err;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*key))
return SMP_INVALID_PARAMS;
/* Check if remote and local public keys are the same and debug key is
* not in use.
*/
if (!test_bit(SMP_FLAG_DEBUG_KEY, &smp->flags) &&
!crypto_memneq(key, smp->local_pk, 64)) {
bt_dev_err(hdev, "Remote and local public keys are identical");
return SMP_UNSPECIFIED;
}
memcpy(smp->remote_pk, key, 64);
if (test_bit(SMP_FLAG_REMOTE_OOB, &smp->flags)) {
err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
smp->rr, 0, cfm.confirm_val);
if (err)
return SMP_UNSPECIFIED;
if (crypto_memneq(cfm.confirm_val, smp->pcnf, 16))
return SMP_CONFIRM_FAILED;
}
/* Non-initiating device sends its public key after receiving
* the key from the initiating device.
*/
if (!hcon->out) {
err = sc_send_public_key(smp);
if (err)
return err;
}
SMP_DBG("Remote Public Key X: %32phN", smp->remote_pk);
SMP_DBG("Remote Public Key Y: %32phN", smp->remote_pk + 32);
/* Compute the shared secret on the same crypto tfm on which the private
* key was set/generated.
*/
if (test_bit(SMP_FLAG_LOCAL_OOB, &smp->flags)) {
struct l2cap_chan *hchan = hdev->smp_data;
struct smp_dev *smp_dev;
if (!hchan || !hchan->data)
return SMP_UNSPECIFIED;
smp_dev = hchan->data;
tfm_ecdh = smp_dev->tfm_ecdh;
} else {
tfm_ecdh = smp->tfm_ecdh;
}
if (compute_ecdh_secret(tfm_ecdh, smp->remote_pk, smp->dhkey))
return SMP_UNSPECIFIED;
SMP_DBG("DHKey %32phN", smp->dhkey);
set_bit(SMP_FLAG_REMOTE_PK, &smp->flags);
smp->method = sc_select_method(smp);
BT_DBG("%s selected method 0x%02x", hdev->name, smp->method);
/* JUST_WORKS and JUST_CFM result in an unauthenticated key */
if (smp->method == JUST_WORKS || smp->method == JUST_CFM)
hcon->pending_sec_level = BT_SECURITY_MEDIUM;
else
hcon->pending_sec_level = BT_SECURITY_FIPS;
if (!crypto_memneq(debug_pk, smp->remote_pk, 64))
set_bit(SMP_FLAG_DEBUG_KEY, &smp->flags);
if (smp->method == DSP_PASSKEY) {
get_random_bytes(&hcon->passkey_notify,
sizeof(hcon->passkey_notify));
hcon->passkey_notify %= 1000000;
hcon->passkey_entered = 0;
smp->passkey_round = 0;
if (mgmt_user_passkey_notify(hdev, &hcon->dst, hcon->type,
hcon->dst_type,
hcon->passkey_notify,
hcon->passkey_entered))
return SMP_UNSPECIFIED;
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
}
if (smp->method == REQ_OOB) {
if (hcon->out)
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
sizeof(smp->prnd), smp->prnd);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
return 0;
}
if (hcon->out)
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
if (smp->method == REQ_PASSKEY) {
if (mgmt_user_passkey_request(hdev, &hcon->dst, hcon->type,
hcon->dst_type))
return SMP_UNSPECIFIED;
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
set_bit(SMP_FLAG_WAIT_USER, &smp->flags);
return 0;
}
/* The Initiating device waits for the non-initiating device to
* send the confirm value.
*/
if (conn->hcon->out)
return 0;
err = smp_f4(smp->tfm_cmac, smp->local_pk, smp->remote_pk, smp->prnd,
0, cfm.confirm_val);
if (err)
return SMP_UNSPECIFIED;
smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cfm), &cfm);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
return 0;
}
static int smp_cmd_dhkey_check(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_dhkey_check *check = (void *) skb->data;
struct l2cap_chan *chan = conn->smp;
struct hci_conn *hcon = conn->hcon;
struct smp_chan *smp = chan->data;
u8 a[7], b[7], *local_addr, *remote_addr;
u8 io_cap[3], r[16], e[16];
int err;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*check))
return SMP_INVALID_PARAMS;
memcpy(a, &hcon->init_addr, 6);
memcpy(b, &hcon->resp_addr, 6);
a[6] = hcon->init_addr_type;
b[6] = hcon->resp_addr_type;
if (hcon->out) {
local_addr = a;
remote_addr = b;
memcpy(io_cap, &smp->prsp[1], 3);
} else {
local_addr = b;
remote_addr = a;
memcpy(io_cap, &smp->preq[1], 3);
}
memset(r, 0, sizeof(r));
if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
put_unaligned_le32(hcon->passkey_notify, r);
else if (smp->method == REQ_OOB)
memcpy(r, smp->lr, 16);
err = smp_f6(smp->tfm_cmac, smp->mackey, smp->rrnd, smp->prnd, r,
io_cap, remote_addr, local_addr, e);
if (err)
return SMP_UNSPECIFIED;
if (crypto_memneq(check->e, e, 16))
return SMP_DHKEY_CHECK_FAILED;
if (!hcon->out) {
if (test_bit(SMP_FLAG_WAIT_USER, &smp->flags)) {
set_bit(SMP_FLAG_DHKEY_PENDING, &smp->flags);
return 0;
}
/* Slave sends DHKey check as response to master */
sc_dhkey_check(smp);
}
sc_add_ltk(smp);
if (hcon->out) {
hci_le_start_enc(hcon, 0, 0, smp->tk, smp->enc_key_size);
hcon->enc_key_size = smp->enc_key_size;
}
return 0;
}
static int smp_cmd_keypress_notify(struct l2cap_conn *conn,
struct sk_buff *skb)
{
struct smp_cmd_keypress_notify *kp = (void *) skb->data;
BT_DBG("value 0x%02x", kp->value);
return 0;
}
static int smp_sig_channel(struct l2cap_chan *chan, struct sk_buff *skb)
{
struct l2cap_conn *conn = chan->conn;
struct hci_conn *hcon = conn->hcon;
struct smp_chan *smp;
__u8 code, reason;
int err = 0;
if (skb->len < 1)
return -EILSEQ;
if (!hci_dev_test_flag(hcon->hdev, HCI_LE_ENABLED)) {
reason = SMP_PAIRING_NOTSUPP;
goto done;
}
code = skb->data[0];
skb_pull(skb, sizeof(code));
smp = chan->data;
if (code > SMP_CMD_MAX)
goto drop;
if (smp && !test_and_clear_bit(code, &smp->allow_cmd))
goto drop;
/* If we don't have a context the only allowed commands are
* pairing request and security request.
*/
if (!smp && code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ)
goto drop;
switch (code) {
case SMP_CMD_PAIRING_REQ:
reason = smp_cmd_pairing_req(conn, skb);
break;
case SMP_CMD_PAIRING_FAIL:
smp_failure(conn, 0);
err = -EPERM;
break;
case SMP_CMD_PAIRING_RSP:
reason = smp_cmd_pairing_rsp(conn, skb);
break;
case SMP_CMD_SECURITY_REQ:
reason = smp_cmd_security_req(conn, skb);
break;
case SMP_CMD_PAIRING_CONFIRM:
reason = smp_cmd_pairing_confirm(conn, skb);
break;
case SMP_CMD_PAIRING_RANDOM:
reason = smp_cmd_pairing_random(conn, skb);
break;
case SMP_CMD_ENCRYPT_INFO:
reason = smp_cmd_encrypt_info(conn, skb);
break;
case SMP_CMD_MASTER_IDENT:
reason = smp_cmd_master_ident(conn, skb);
break;
case SMP_CMD_IDENT_INFO:
reason = smp_cmd_ident_info(conn, skb);
break;
case SMP_CMD_IDENT_ADDR_INFO:
reason = smp_cmd_ident_addr_info(conn, skb);
break;
case SMP_CMD_SIGN_INFO:
reason = smp_cmd_sign_info(conn, skb);
break;
case SMP_CMD_PUBLIC_KEY:
reason = smp_cmd_public_key(conn, skb);
break;
case SMP_CMD_DHKEY_CHECK:
reason = smp_cmd_dhkey_check(conn, skb);
break;
case SMP_CMD_KEYPRESS_NOTIFY:
reason = smp_cmd_keypress_notify(conn, skb);
break;
default:
BT_DBG("Unknown command code 0x%2.2x", code);
reason = SMP_CMD_NOTSUPP;
goto done;
}
done:
if (!err) {
if (reason)
smp_failure(conn, reason);
kfree_skb(skb);
}
return err;
drop:
bt_dev_err(hcon->hdev, "unexpected SMP command 0x%02x from %pMR",
code, &hcon->dst);
kfree_skb(skb);
return 0;
}
static void smp_teardown_cb(struct l2cap_chan *chan, int err)
{
struct l2cap_conn *conn = chan->conn;
BT_DBG("chan %p", chan);
if (chan->data)
smp_chan_destroy(conn);
conn->smp = NULL;
l2cap_chan_put(chan);
}
static void bredr_pairing(struct l2cap_chan *chan)
{
struct l2cap_conn *conn = chan->conn;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
struct smp_cmd_pairing req;
struct smp_chan *smp;
BT_DBG("chan %p", chan);
/* Only new pairings are interesting */
if (!test_bit(HCI_CONN_NEW_LINK_KEY, &hcon->flags))
return;
/* Don't bother if we're not encrypted */
if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
return;
/* Only initiator may initiate SMP over BR/EDR */
if (hcon->role != HCI_ROLE_MASTER)
return;
/* Secure Connections support must be enabled */
if (!hci_dev_test_flag(hdev, HCI_SC_ENABLED))
return;
/* BR/EDR must use Secure Connections for SMP */
if (!test_bit(HCI_CONN_AES_CCM, &hcon->flags) &&
!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
return;
/* If our LE support is not enabled don't do anything */
if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
return;
/* Don't bother if remote LE support is not enabled */
if (!lmp_host_le_capable(hcon))
return;
/* Remote must support SMP fixed chan for BR/EDR */
if (!(conn->remote_fixed_chan & L2CAP_FC_SMP_BREDR))
return;
/* Don't bother if SMP is already ongoing */
if (chan->data)
return;
smp = smp_chan_create(conn);
if (!smp) {
bt_dev_err(hdev, "unable to create SMP context for BR/EDR");
return;
}
set_bit(SMP_FLAG_SC, &smp->flags);
BT_DBG("%s starting SMP over BR/EDR", hdev->name);
/* Prepare and send the BR/EDR SMP Pairing Request */
build_bredr_pairing_cmd(smp, &req, NULL);
smp->preq[0] = SMP_CMD_PAIRING_REQ;
memcpy(&smp->preq[1], &req, sizeof(req));
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(req), &req);
SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RSP);
}
static void smp_resume_cb(struct l2cap_chan *chan)
{
struct smp_chan *smp = chan->data;
struct l2cap_conn *conn = chan->conn;
struct hci_conn *hcon = conn->hcon;
BT_DBG("chan %p", chan);
if (hcon->type == ACL_LINK) {
bredr_pairing(chan);
return;
}
if (!smp)
return;
if (!test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
return;
cancel_delayed_work(&smp->security_timer);
smp_distribute_keys(smp);
}
static void smp_ready_cb(struct l2cap_chan *chan)
{
struct l2cap_conn *conn = chan->conn;
struct hci_conn *hcon = conn->hcon;
BT_DBG("chan %p", chan);
/* No need to call l2cap_chan_hold() here since we already own
* the reference taken in smp_new_conn_cb(). This is just the
* first time that we tie it to a specific pointer. The code in
* l2cap_core.c ensures that there's no risk this function wont
* get called if smp_new_conn_cb was previously called.
*/
conn->smp = chan;
if (hcon->type == ACL_LINK && test_bit(HCI_CONN_ENCRYPT, &hcon->flags))
bredr_pairing(chan);
}
static int smp_recv_cb(struct l2cap_chan *chan, struct sk_buff *skb)
{
int err;
BT_DBG("chan %p", chan);
err = smp_sig_channel(chan, skb);
if (err) {
struct smp_chan *smp = chan->data;
if (smp)
cancel_delayed_work_sync(&smp->security_timer);
hci_disconnect(chan->conn->hcon, HCI_ERROR_AUTH_FAILURE);
}
return err;
}
static struct sk_buff *smp_alloc_skb_cb(struct l2cap_chan *chan,
unsigned long hdr_len,
unsigned long len, int nb)
{
struct sk_buff *skb;
skb = bt_skb_alloc(hdr_len + len, GFP_KERNEL);
if (!skb)
return ERR_PTR(-ENOMEM);
skb->priority = HCI_PRIO_MAX;
bt_cb(skb)->l2cap.chan = chan;
return skb;
}
static const struct l2cap_ops smp_chan_ops = {
.name = "Security Manager",
.ready = smp_ready_cb,
.recv = smp_recv_cb,
.alloc_skb = smp_alloc_skb_cb,
.teardown = smp_teardown_cb,
.resume = smp_resume_cb,
.new_connection = l2cap_chan_no_new_connection,
.state_change = l2cap_chan_no_state_change,
.close = l2cap_chan_no_close,
.defer = l2cap_chan_no_defer,
.suspend = l2cap_chan_no_suspend,
.set_shutdown = l2cap_chan_no_set_shutdown,
.get_sndtimeo = l2cap_chan_no_get_sndtimeo,
};
static inline struct l2cap_chan *smp_new_conn_cb(struct l2cap_chan *pchan)
{
struct l2cap_chan *chan;
BT_DBG("pchan %p", pchan);
chan = l2cap_chan_create();
if (!chan)
return NULL;
chan->chan_type = pchan->chan_type;
chan->ops = &smp_chan_ops;
chan->scid = pchan->scid;
chan->dcid = chan->scid;
chan->imtu = pchan->imtu;
chan->omtu = pchan->omtu;
chan->mode = pchan->mode;
/* Other L2CAP channels may request SMP routines in order to
* change the security level. This means that the SMP channel
* lock must be considered in its own category to avoid lockdep
* warnings.
*/
atomic_set(&chan->nesting, L2CAP_NESTING_SMP);
BT_DBG("created chan %p", chan);
return chan;
}
static const struct l2cap_ops smp_root_chan_ops = {
.name = "Security Manager Root",
.new_connection = smp_new_conn_cb,
/* None of these are implemented for the root channel */
.close = l2cap_chan_no_close,
.alloc_skb = l2cap_chan_no_alloc_skb,
.recv = l2cap_chan_no_recv,
.state_change = l2cap_chan_no_state_change,
.teardown = l2cap_chan_no_teardown,
.ready = l2cap_chan_no_ready,
.defer = l2cap_chan_no_defer,
.suspend = l2cap_chan_no_suspend,
.resume = l2cap_chan_no_resume,
.set_shutdown = l2cap_chan_no_set_shutdown,
.get_sndtimeo = l2cap_chan_no_get_sndtimeo,
};
static struct l2cap_chan *smp_add_cid(struct hci_dev *hdev, u16 cid)
{
struct l2cap_chan *chan;
struct smp_dev *smp;
struct crypto_shash *tfm_cmac;
struct crypto_kpp *tfm_ecdh;
if (cid == L2CAP_CID_SMP_BREDR) {
smp = NULL;
goto create_chan;
}
smp = kzalloc(sizeof(*smp), GFP_KERNEL);
if (!smp)
return ERR_PTR(-ENOMEM);
tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
if (IS_ERR(tfm_cmac)) {
BT_ERR("Unable to create CMAC crypto context");
kfree_sensitive(smp);
return ERR_CAST(tfm_cmac);
}
tfm_ecdh = crypto_alloc_kpp("ecdh", 0, 0);
if (IS_ERR(tfm_ecdh)) {
BT_ERR("Unable to create ECDH crypto context");
crypto_free_shash(tfm_cmac);
kfree_sensitive(smp);
return ERR_CAST(tfm_ecdh);
}
smp->local_oob = false;
smp->tfm_cmac = tfm_cmac;
smp->tfm_ecdh = tfm_ecdh;
create_chan:
chan = l2cap_chan_create();
if (!chan) {
if (smp) {
crypto_free_shash(smp->tfm_cmac);
crypto_free_kpp(smp->tfm_ecdh);
kfree_sensitive(smp);
}
return ERR_PTR(-ENOMEM);
}
chan->data = smp;
l2cap_add_scid(chan, cid);
l2cap_chan_set_defaults(chan);
if (cid == L2CAP_CID_SMP) {
u8 bdaddr_type;
hci_copy_identity_address(hdev, &chan->src, &bdaddr_type);
if (bdaddr_type == ADDR_LE_DEV_PUBLIC)
chan->src_type = BDADDR_LE_PUBLIC;
else
chan->src_type = BDADDR_LE_RANDOM;
} else {
bacpy(&chan->src, &hdev->bdaddr);
chan->src_type = BDADDR_BREDR;
}
chan->state = BT_LISTEN;
chan->mode = L2CAP_MODE_BASIC;
chan->imtu = L2CAP_DEFAULT_MTU;
chan->ops = &smp_root_chan_ops;
/* Set correct nesting level for a parent/listening channel */
atomic_set(&chan->nesting, L2CAP_NESTING_PARENT);
return chan;
}
static void smp_del_chan(struct l2cap_chan *chan)
{
struct smp_dev *smp;
BT_DBG("chan %p", chan);
smp = chan->data;
if (smp) {
chan->data = NULL;
crypto_free_shash(smp->tfm_cmac);
crypto_free_kpp(smp->tfm_ecdh);
kfree_sensitive(smp);
}
l2cap_chan_put(chan);
}
static ssize_t force_bredr_smp_read(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct hci_dev *hdev = file->private_data;
char buf[3];
buf[0] = hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP) ? 'Y': 'N';
buf[1] = '\n';
buf[2] = '\0';
return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}
static ssize_t force_bredr_smp_write(struct file *file,
const char __user *user_buf,
size_t count, loff_t *ppos)
{
struct hci_dev *hdev = file->private_data;
bool enable;
int err;
err = kstrtobool_from_user(user_buf, count, &enable);
if (err)
return err;
if (enable == hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
return -EALREADY;
if (enable) {
struct l2cap_chan *chan;
chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
if (IS_ERR(chan))
return PTR_ERR(chan);
hdev->smp_bredr_data = chan;
} else {
struct l2cap_chan *chan;
chan = hdev->smp_bredr_data;
hdev->smp_bredr_data = NULL;
smp_del_chan(chan);
}
hci_dev_change_flag(hdev, HCI_FORCE_BREDR_SMP);
return count;
}
static const struct file_operations force_bredr_smp_fops = {
.open = simple_open,
.read = force_bredr_smp_read,
.write = force_bredr_smp_write,
.llseek = default_llseek,
};
int smp_register(struct hci_dev *hdev)
{
struct l2cap_chan *chan;
BT_DBG("%s", hdev->name);
/* If the controller does not support Low Energy operation, then
* there is also no need to register any SMP channel.
*/
if (!lmp_le_capable(hdev))
return 0;
if (WARN_ON(hdev->smp_data)) {
chan = hdev->smp_data;
hdev->smp_data = NULL;
smp_del_chan(chan);
}
chan = smp_add_cid(hdev, L2CAP_CID_SMP);
if (IS_ERR(chan))
return PTR_ERR(chan);
hdev->smp_data = chan;
/* If the controller does not support BR/EDR Secure Connections
* feature, then the BR/EDR SMP channel shall not be present.
*
* To test this with Bluetooth 4.0 controllers, create a debugfs
* switch that allows forcing BR/EDR SMP support and accepting
* cross-transport pairing on non-AES encrypted connections.
*/
if (!lmp_sc_capable(hdev)) {
debugfs_create_file("force_bredr_smp", 0644, hdev->debugfs,
hdev, &force_bredr_smp_fops);
/* Flag can be already set here (due to power toggle) */
if (!hci_dev_test_flag(hdev, HCI_FORCE_BREDR_SMP))
return 0;
}
if (WARN_ON(hdev->smp_bredr_data)) {
chan = hdev->smp_bredr_data;
hdev->smp_bredr_data = NULL;
smp_del_chan(chan);
}
chan = smp_add_cid(hdev, L2CAP_CID_SMP_BREDR);
if (IS_ERR(chan)) {
int err = PTR_ERR(chan);
chan = hdev->smp_data;
hdev->smp_data = NULL;
smp_del_chan(chan);
return err;
}
hdev->smp_bredr_data = chan;
return 0;
}
void smp_unregister(struct hci_dev *hdev)
{
struct l2cap_chan *chan;
if (hdev->smp_bredr_data) {
chan = hdev->smp_bredr_data;
hdev->smp_bredr_data = NULL;
smp_del_chan(chan);
}
if (hdev->smp_data) {
chan = hdev->smp_data;
hdev->smp_data = NULL;
smp_del_chan(chan);
}
}
#if IS_ENABLED(CONFIG_BT_SELFTEST_SMP)
static int __init test_debug_key(struct crypto_kpp *tfm_ecdh)
{
u8 pk[64];
int err;
err = set_ecdh_privkey(tfm_ecdh, debug_sk);
if (err)
return err;
err = generate_ecdh_public_key(tfm_ecdh, pk);
if (err)
return err;
if (crypto_memneq(pk, debug_pk, 64))
return -EINVAL;
return 0;
}
static int __init test_ah(void)
{
const u8 irk[16] = {
0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
const u8 r[3] = { 0x94, 0x81, 0x70 };
const u8 exp[3] = { 0xaa, 0xfb, 0x0d };
u8 res[3];
int err;
err = smp_ah(irk, r, res);
if (err)
return err;
if (crypto_memneq(res, exp, 3))
return -EINVAL;
return 0;
}
static int __init test_c1(void)
{
const u8 k[16] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
const u8 r[16] = {
0xe0, 0x2e, 0x70, 0xc6, 0x4e, 0x27, 0x88, 0x63,
0x0e, 0x6f, 0xad, 0x56, 0x21, 0xd5, 0x83, 0x57 };
const u8 preq[7] = { 0x01, 0x01, 0x00, 0x00, 0x10, 0x07, 0x07 };
const u8 pres[7] = { 0x02, 0x03, 0x00, 0x00, 0x08, 0x00, 0x05 };
const u8 _iat = 0x01;
const u8 _rat = 0x00;
const bdaddr_t ra = { { 0xb6, 0xb5, 0xb4, 0xb3, 0xb2, 0xb1 } };
const bdaddr_t ia = { { 0xa6, 0xa5, 0xa4, 0xa3, 0xa2, 0xa1 } };
const u8 exp[16] = {
0x86, 0x3b, 0xf1, 0xbe, 0xc5, 0x4d, 0xa7, 0xd2,
0xea, 0x88, 0x89, 0x87, 0xef, 0x3f, 0x1e, 0x1e };
u8 res[16];
int err;
err = smp_c1(k, r, preq, pres, _iat, &ia, _rat, &ra, res);
if (err)
return err;
if (crypto_memneq(res, exp, 16))
return -EINVAL;
return 0;
}
static int __init test_s1(void)
{
const u8 k[16] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
const u8 r1[16] = {
0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11 };
const u8 r2[16] = {
0x00, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99 };
const u8 exp[16] = {
0x62, 0xa0, 0x6d, 0x79, 0xae, 0x16, 0x42, 0x5b,
0x9b, 0xf4, 0xb0, 0xe8, 0xf0, 0xe1, 0x1f, 0x9a };
u8 res[16];
int err;
err = smp_s1(k, r1, r2, res);
if (err)
return err;
if (crypto_memneq(res, exp, 16))
return -EINVAL;
return 0;
}
static int __init test_f4(struct crypto_shash *tfm_cmac)
{
const u8 u[32] = {
0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
const u8 v[32] = {
0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
const u8 x[16] = {
0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
const u8 z = 0x00;
const u8 exp[16] = {
0x2d, 0x87, 0x74, 0xa9, 0xbe, 0xa1, 0xed, 0xf1,
0x1c, 0xbd, 0xa9, 0x07, 0xf1, 0x16, 0xc9, 0xf2 };
u8 res[16];
int err;
err = smp_f4(tfm_cmac, u, v, x, z, res);
if (err)
return err;
if (crypto_memneq(res, exp, 16))
return -EINVAL;
return 0;
}
static int __init test_f5(struct crypto_shash *tfm_cmac)
{
const u8 w[32] = {
0x98, 0xa6, 0xbf, 0x73, 0xf3, 0x34, 0x8d, 0x86,
0xf1, 0x66, 0xf8, 0xb4, 0x13, 0x6b, 0x79, 0x99,
0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
const u8 n1[16] = {
0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
const u8 n2[16] = {
0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
const u8 exp_ltk[16] = {
0x38, 0x0a, 0x75, 0x94, 0xb5, 0x22, 0x05, 0x98,
0x23, 0xcd, 0xd7, 0x69, 0x11, 0x79, 0x86, 0x69 };
const u8 exp_mackey[16] = {
0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
u8 mackey[16], ltk[16];
int err;
err = smp_f5(tfm_cmac, w, n1, n2, a1, a2, mackey, ltk);
if (err)
return err;
if (crypto_memneq(mackey, exp_mackey, 16))
return -EINVAL;
if (crypto_memneq(ltk, exp_ltk, 16))
return -EINVAL;
return 0;
}
static int __init test_f6(struct crypto_shash *tfm_cmac)
{
const u8 w[16] = {
0x20, 0x6e, 0x63, 0xce, 0x20, 0x6a, 0x3f, 0xfd,
0x02, 0x4a, 0x08, 0xa1, 0x76, 0xf1, 0x65, 0x29 };
const u8 n1[16] = {
0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
const u8 n2[16] = {
0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
const u8 r[16] = {
0xc8, 0x0f, 0x2d, 0x0c, 0xd2, 0x42, 0xda, 0x08,
0x54, 0xbb, 0x53, 0xb4, 0x3b, 0x34, 0xa3, 0x12 };
const u8 io_cap[3] = { 0x02, 0x01, 0x01 };
const u8 a1[7] = { 0xce, 0xbf, 0x37, 0x37, 0x12, 0x56, 0x00 };
const u8 a2[7] = { 0xc1, 0xcf, 0x2d, 0x70, 0x13, 0xa7, 0x00 };
const u8 exp[16] = {
0x61, 0x8f, 0x95, 0xda, 0x09, 0x0b, 0x6c, 0xd2,
0xc5, 0xe8, 0xd0, 0x9c, 0x98, 0x73, 0xc4, 0xe3 };
u8 res[16];
int err;
err = smp_f6(tfm_cmac, w, n1, n2, r, io_cap, a1, a2, res);
if (err)
return err;
if (crypto_memneq(res, exp, 16))
return -EINVAL;
return 0;
}
static int __init test_g2(struct crypto_shash *tfm_cmac)
{
const u8 u[32] = {
0xe6, 0x9d, 0x35, 0x0e, 0x48, 0x01, 0x03, 0xcc,
0xdb, 0xfd, 0xf4, 0xac, 0x11, 0x91, 0xf4, 0xef,
0xb9, 0xa5, 0xf9, 0xe9, 0xa7, 0x83, 0x2c, 0x5e,
0x2c, 0xbe, 0x97, 0xf2, 0xd2, 0x03, 0xb0, 0x20 };
const u8 v[32] = {
0xfd, 0xc5, 0x7f, 0xf4, 0x49, 0xdd, 0x4f, 0x6b,
0xfb, 0x7c, 0x9d, 0xf1, 0xc2, 0x9a, 0xcb, 0x59,
0x2a, 0xe7, 0xd4, 0xee, 0xfb, 0xfc, 0x0a, 0x90,
0x9a, 0xbb, 0xf6, 0x32, 0x3d, 0x8b, 0x18, 0x55 };
const u8 x[16] = {
0xab, 0xae, 0x2b, 0x71, 0xec, 0xb2, 0xff, 0xff,
0x3e, 0x73, 0x77, 0xd1, 0x54, 0x84, 0xcb, 0xd5 };
const u8 y[16] = {
0xcf, 0xc4, 0x3d, 0xff, 0xf7, 0x83, 0x65, 0x21,
0x6e, 0x5f, 0xa7, 0x25, 0xcc, 0xe7, 0xe8, 0xa6 };
const u32 exp_val = 0x2f9ed5ba % 1000000;
u32 val;
int err;
err = smp_g2(tfm_cmac, u, v, x, y, &val);
if (err)
return err;
if (val != exp_val)
return -EINVAL;
return 0;
}
static int __init test_h6(struct crypto_shash *tfm_cmac)
{
const u8 w[16] = {
0x9b, 0x7d, 0x39, 0x0a, 0xa6, 0x10, 0x10, 0x34,
0x05, 0xad, 0xc8, 0x57, 0xa3, 0x34, 0x02, 0xec };
const u8 key_id[4] = { 0x72, 0x62, 0x65, 0x6c };
const u8 exp[16] = {
0x99, 0x63, 0xb1, 0x80, 0xe2, 0xa9, 0xd3, 0xe8,
0x1c, 0xc9, 0x6d, 0xe7, 0x02, 0xe1, 0x9a, 0x2d };
u8 res[16];
int err;
err = smp_h6(tfm_cmac, w, key_id, res);
if (err)
return err;
if (crypto_memneq(res, exp, 16))
return -EINVAL;
return 0;
}
static char test_smp_buffer[32];
static ssize_t test_smp_read(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
return simple_read_from_buffer(user_buf, count, ppos, test_smp_buffer,
strlen(test_smp_buffer));
}
static const struct file_operations test_smp_fops = {
.open = simple_open,
.read = test_smp_read,
.llseek = default_llseek,
};
static int __init run_selftests(struct crypto_shash *tfm_cmac,
struct crypto_kpp *tfm_ecdh)
{
ktime_t calltime, delta, rettime;
unsigned long long duration;
int err;
calltime = ktime_get();
err = test_debug_key(tfm_ecdh);
if (err) {
BT_ERR("debug_key test failed");
goto done;
}
err = test_ah();
if (err) {
BT_ERR("smp_ah test failed");
goto done;
}
err = test_c1();
if (err) {
BT_ERR("smp_c1 test failed");
goto done;
}
err = test_s1();
if (err) {
BT_ERR("smp_s1 test failed");
goto done;
}
err = test_f4(tfm_cmac);
if (err) {
BT_ERR("smp_f4 test failed");
goto done;
}
err = test_f5(tfm_cmac);
if (err) {
BT_ERR("smp_f5 test failed");
goto done;
}
err = test_f6(tfm_cmac);
if (err) {
BT_ERR("smp_f6 test failed");
goto done;
}
err = test_g2(tfm_cmac);
if (err) {
BT_ERR("smp_g2 test failed");
goto done;
}
err = test_h6(tfm_cmac);
if (err) {
BT_ERR("smp_h6 test failed");
goto done;
}
rettime = ktime_get();
delta = ktime_sub(rettime, calltime);
duration = (unsigned long long) ktime_to_ns(delta) >> 10;
BT_INFO("SMP test passed in %llu usecs", duration);
done:
if (!err)
snprintf(test_smp_buffer, sizeof(test_smp_buffer),
"PASS (%llu usecs)\n", duration);
else
snprintf(test_smp_buffer, sizeof(test_smp_buffer), "FAIL\n");
debugfs_create_file("selftest_smp", 0444, bt_debugfs, NULL,
&test_smp_fops);
return err;
}
int __init bt_selftest_smp(void)
{
struct crypto_shash *tfm_cmac;
struct crypto_kpp *tfm_ecdh;
int err;
tfm_cmac = crypto_alloc_shash("cmac(aes)", 0, 0);
if (IS_ERR(tfm_cmac)) {
BT_ERR("Unable to create CMAC crypto context");
return PTR_ERR(tfm_cmac);
}
tfm_ecdh = crypto_alloc_kpp("ecdh", 0, 0);
if (IS_ERR(tfm_ecdh)) {
BT_ERR("Unable to create ECDH crypto context");
crypto_free_shash(tfm_cmac);
return PTR_ERR(tfm_ecdh);
}
err = run_selftests(tfm_cmac, tfm_ecdh);
crypto_free_shash(tfm_cmac);
crypto_free_kpp(tfm_ecdh);
return err;
}
#endif
|