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
|
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "dtlsidentity.h"
#include "cert.h"
#include "cryptohi.h"
#include "keyhi.h"
#include "nsError.h"
#include "pk11pub.h"
#include "sechash.h"
#include "ssl.h"
#include "mozilla/Sprintf.h"
namespace mozilla {
RefPtr<DtlsIdentity> DtlsIdentity::Generate() {
ScopedPK11SlotInfo slot(PK11_GetInternalSlot());
if (!slot) {
return nullptr;
}
uint8_t random_name[16];
SECStatus rv = PK11_GenerateRandomOnSlot(slot, random_name,
sizeof(random_name));
if (rv != SECSuccess)
return nullptr;
std::string name;
char chunk[3];
for (size_t i = 0; i < sizeof(random_name); ++i) {
SprintfLiteral(chunk, "%.2x", random_name[i]);
name += chunk;
}
std::string subject_name_string = "CN=" + name;
ScopedCERTName subject_name(CERT_AsciiToName(subject_name_string.c_str()));
if (!subject_name) {
return nullptr;
}
unsigned char paramBuf[12]; // OIDs are small
SECItem ecdsaParams = { siBuffer, paramBuf, sizeof(paramBuf) };
SECOidData* oidData = SECOID_FindOIDByTag(SEC_OID_SECG_EC_SECP256R1);
if (!oidData || (oidData->oid.len > (sizeof(paramBuf) - 2))) {
return nullptr;
}
ecdsaParams.data[0] = SEC_ASN1_OBJECT_ID;
ecdsaParams.data[1] = oidData->oid.len;
memcpy(ecdsaParams.data + 2, oidData->oid.data, oidData->oid.len);
ecdsaParams.len = oidData->oid.len + 2;
ScopedSECKEYPrivateKey private_key;
ScopedSECKEYPublicKey public_key;
SECKEYPublicKey *pubkey;
private_key =
PK11_GenerateKeyPair(slot,
CKM_EC_KEY_PAIR_GEN, &ecdsaParams, &pubkey,
PR_FALSE, PR_TRUE, nullptr);
if (private_key == nullptr)
return nullptr;
public_key = pubkey;
ScopedCERTSubjectPublicKeyInfo spki(
SECKEY_CreateSubjectPublicKeyInfo(pubkey));
if (!spki) {
return nullptr;
}
ScopedCERTCertificateRequest certreq(
CERT_CreateCertificateRequest(subject_name, spki, nullptr));
if (!certreq) {
return nullptr;
}
// From 1 day before todayto 30 days after.
// This is a sort of arbitrary range designed to be valid
// now with some slack in case the other side expects
// some before expiry.
//
// Note: explicit casts necessary to avoid
// warning C4307: '*' : integral constant overflow
static const PRTime oneDay = PRTime(PR_USEC_PER_SEC)
* PRTime(60) // sec
* PRTime(60) // min
* PRTime(24); // hours
PRTime now = PR_Now();
PRTime notBefore = now - oneDay;
PRTime notAfter = now + (PRTime(30) * oneDay);
ScopedCERTValidity validity(CERT_CreateValidity(notBefore, notAfter));
if (!validity) {
return nullptr;
}
unsigned long serial;
// Note: This serial in principle could collide, but it's unlikely
rv = PK11_GenerateRandomOnSlot(slot,
reinterpret_cast<unsigned char *>(&serial),
sizeof(serial));
if (rv != SECSuccess) {
return nullptr;
}
ScopedCERTCertificate certificate(
CERT_CreateCertificate(serial, subject_name, validity, certreq));
if (!certificate) {
return nullptr;
}
PLArenaPool *arena = certificate->arena;
rv = SECOID_SetAlgorithmID(arena, &certificate->signature,
SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE, 0);
if (rv != SECSuccess)
return nullptr;
// Set version to X509v3.
*(certificate->version.data) = SEC_CERTIFICATE_VERSION_3;
certificate->version.len = 1;
SECItem innerDER;
innerDER.len = 0;
innerDER.data = nullptr;
if (!SEC_ASN1EncodeItem(arena, &innerDER, certificate,
SEC_ASN1_GET(CERT_CertificateTemplate))) {
return nullptr;
}
SECItem *signedCert = PORT_ArenaZNew(arena, SECItem);
if (!signedCert) {
return nullptr;
}
rv = SEC_DerSignData(arena, signedCert, innerDER.data, innerDER.len,
private_key,
SEC_OID_ANSIX962_ECDSA_SHA256_SIGNATURE);
if (rv != SECSuccess) {
return nullptr;
}
certificate->derCert = *signedCert;
RefPtr<DtlsIdentity> identity =
new DtlsIdentity(private_key.forget(), certificate.forget(), ssl_kea_ecdh);
return identity.forget();
}
const std::string DtlsIdentity::DEFAULT_HASH_ALGORITHM = "sha-256";
nsresult DtlsIdentity::ComputeFingerprint(const std::string algorithm,
uint8_t *digest,
size_t size,
size_t *digest_length) const {
const UniqueCERTCertificate& c = cert();
MOZ_ASSERT(c);
return ComputeFingerprint(c, algorithm, digest, size, digest_length);
}
nsresult DtlsIdentity::ComputeFingerprint(const UniqueCERTCertificate& cert,
const std::string algorithm,
uint8_t *digest,
size_t size,
size_t *digest_length) {
MOZ_ASSERT(cert);
HASH_HashType ht;
if (algorithm == "sha-1") {
ht = HASH_AlgSHA1;
} else if (algorithm == "sha-224") {
ht = HASH_AlgSHA224;
} else if (algorithm == "sha-256") {
ht = HASH_AlgSHA256;
} else if (algorithm == "sha-384") {
ht = HASH_AlgSHA384;
} else if (algorithm == "sha-512") {
ht = HASH_AlgSHA512;
} else {
return NS_ERROR_INVALID_ARG;
}
const SECHashObject *ho = HASH_GetHashObject(ht);
MOZ_ASSERT(ho);
if (!ho) {
return NS_ERROR_INVALID_ARG;
}
MOZ_ASSERT(ho->length >= 20); // Double check
if (size < ho->length) {
return NS_ERROR_INVALID_ARG;
}
SECStatus rv = HASH_HashBuf(ho->type, digest,
cert->derCert.data,
cert->derCert.len);
if (rv != SECSuccess) {
return NS_ERROR_FAILURE;
}
*digest_length = ho->length;
return NS_OK;
}
} // close namespace
|
