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
|
package tpm2test
import (
"bytes"
"testing"
. "github.com/google/go-tpm/tpm2"
"github.com/google/go-tpm/tpm2/transport/simulator"
)
func TestAuditSession(t *testing.T) {
thetpm, err := simulator.OpenSimulator()
if err != nil {
t.Fatalf("could not connect to TPM simulator: %v", err)
}
defer thetpm.Close()
// Create the audit session
sess, cleanup, err := HMACSession(thetpm, TPMAlgSHA256, 16, Audit())
if err != nil {
t.Fatalf("%v", err)
}
defer cleanup()
// Create the AK for audit
createAKCmd := CreatePrimary{
PrimaryHandle: TPMRHOwner,
InPublic: New2B(TPMTPublic{
Type: TPMAlgECC,
NameAlg: TPMAlgSHA256,
ObjectAttributes: TPMAObject{
FixedTPM: true,
STClear: false,
FixedParent: true,
SensitiveDataOrigin: true,
UserWithAuth: true,
AdminWithPolicy: false,
NoDA: true,
EncryptedDuplication: false,
Restricted: true,
Decrypt: false,
SignEncrypt: true,
},
Parameters: NewTPMUPublicParms(
TPMAlgECC,
&TPMSECCParms{
Scheme: TPMTECCScheme{
Scheme: TPMAlgECDSA,
Details: NewTPMUAsymScheme(
TPMAlgECDSA,
&TPMSSigSchemeECDSA{
HashAlg: TPMAlgSHA256,
},
),
},
CurveID: TPMECCNistP256,
},
),
},
),
}
createAKRsp, err := createAKCmd.Execute(thetpm)
if err != nil {
t.Fatalf("%v", err)
}
defer func() {
// Flush the AK
flush := FlushContext{FlushHandle: createAKRsp.ObjectHandle}
if _, err := flush.Execute(thetpm); err != nil {
t.Errorf("%v", err)
}
}()
audit, err := NewAudit(TPMAlgSHA256)
if err != nil {
t.Fatalf("%v", err)
}
// Call GetCapability a bunch of times with the audit session and make sure it extends like
// we expect it to.
props := []TPMPT{
TPMPTFamilyIndicator,
TPMPTLevel,
TPMPTRevision,
TPMPTDayofYear,
TPMPTYear,
TPMPTManufacturer,
}
for _, prop := range props {
getCmd := GetCapability{
Capability: TPMCapTPMProperties,
Property: uint32(prop),
PropertyCount: 1,
}
getRsp, err := getCmd.Execute(thetpm, sess)
if err != nil {
t.Fatalf("%v", err)
}
if err := AuditCommand(audit, getCmd, getRsp); err != nil {
t.Fatalf("%v", err)
}
// Get the audit digest signed by the AK
getAuditCmd := GetSessionAuditDigest{
PrivacyAdminHandle: TPMRHEndorsement,
SignHandle: NamedHandle{
Handle: createAKRsp.ObjectHandle,
Name: createAKRsp.Name,
},
SessionHandle: sess.Handle(),
QualifyingData: TPM2BData{Buffer: []byte("foobar")},
}
getAuditRsp, err := getAuditCmd.Execute(thetpm)
if err != nil {
t.Fatalf("%v", err)
}
// TODO check the signature with the AK pub
attest, err := getAuditRsp.AuditInfo.Contents()
if err != nil {
t.Fatalf("%v", err)
}
aud, err := attest.Attested.SessionAudit()
if err != nil {
t.Fatalf("%v", err)
}
want := audit.Digest()
got := aud.SessionDigest.Buffer
if !bytes.Equal(want, got) {
t.Errorf("unexpected audit value:\ngot %x\nwant %x", got, want)
}
}
}
|
