Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "net/spdy/spdy_credential_builder.h" |
| 6 | |
| 7 | #include "base/logging.h" |
Torne (Richard Coles) | c2e0dbd | 2013-05-09 18:35:53 +0100 | [diff] [blame] | 8 | #include "base/strings/string_piece.h" |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 9 | #include "crypto/ec_private_key.h" |
| 10 | #include "crypto/ec_signature_creator.h" |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 11 | #include "net/base/net_errors.h" |
Torne (Richard Coles) | c2e0dbd | 2013-05-09 18:35:53 +0100 | [diff] [blame] | 12 | #include "net/cert/asn1_util.h" |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 13 | #include "net/socket/ssl_client_socket.h" |
| 14 | #include "net/spdy/spdy_framer.h" |
Torne (Richard Coles) | 2a99a7e | 2013-03-28 15:31:22 +0000 | [diff] [blame] | 15 | #include "net/ssl/server_bound_cert_service.h" |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 16 | |
| 17 | namespace net { |
| 18 | |
| 19 | namespace { |
| 20 | |
| 21 | std::vector<uint8> ToVector(base::StringPiece piece) { |
| 22 | return std::vector<uint8>(piece.data(), piece.data() + piece.length()); |
| 23 | } |
| 24 | |
| 25 | } // namespace |
| 26 | |
| 27 | // static |
| 28 | int SpdyCredentialBuilder::Build(const std::string& tls_unique, |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 29 | const std::string& key, |
| 30 | const std::string& cert, |
| 31 | size_t slot, |
| 32 | SpdyCredential* credential) { |
Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 33 | std::string secret = SpdyCredentialBuilder::GetCredentialSecret(tls_unique); |
| 34 | |
| 35 | // Extract the SubjectPublicKeyInfo from the certificate. |
| 36 | base::StringPiece public_key_info; |
| 37 | if(!asn1::ExtractSPKIFromDERCert(cert, &public_key_info)) |
| 38 | return ERR_BAD_SSL_CLIENT_AUTH_CERT; |
| 39 | |
| 40 | // Next, extract the SubjectPublicKey data, which will actually |
| 41 | // be stored in the cert field of the credential frame. |
| 42 | base::StringPiece public_key; |
| 43 | if (!asn1::ExtractSubjectPublicKeyFromSPKI(public_key_info, &public_key)) |
| 44 | return ERR_BAD_SSL_CLIENT_AUTH_CERT; |
| 45 | // Drop one byte of padding bits count from the BIT STRING |
| 46 | // (this will always be zero). Drop one byte of X9.62 format specification |
| 47 | // (this will always be 4 to indicated an uncompressed point). |
| 48 | DCHECK_GT(public_key.length(), 2u); |
| 49 | DCHECK_EQ(0, static_cast<int>(public_key[0])); |
| 50 | DCHECK_EQ(4, static_cast<int>(public_key[1])); |
| 51 | public_key = public_key.substr(2, public_key.length()); |
| 52 | |
| 53 | // Convert the strings into a vector<unit8> |
| 54 | std::vector<uint8> der_signature; |
| 55 | scoped_ptr<crypto::ECPrivateKey> private_key( |
| 56 | crypto::ECPrivateKey::CreateFromEncryptedPrivateKeyInfo( |
| 57 | ServerBoundCertService::kEPKIPassword, |
| 58 | ToVector(key), ToVector(public_key_info))); |
| 59 | scoped_ptr<crypto::ECSignatureCreator> creator( |
| 60 | crypto::ECSignatureCreator::Create(private_key.get())); |
| 61 | creator->Sign(reinterpret_cast<const unsigned char *>(secret.data()), |
| 62 | secret.length(), &der_signature); |
| 63 | |
| 64 | std::vector<uint8> proof_vector; |
| 65 | if (!creator->DecodeSignature(der_signature, &proof_vector)) { |
| 66 | NOTREACHED(); |
| 67 | return ERR_UNEXPECTED; |
| 68 | } |
| 69 | |
| 70 | credential->slot = slot; |
| 71 | credential->certs.push_back(public_key.as_string()); |
| 72 | credential->proof.assign(proof_vector.begin(), proof_vector.end()); |
| 73 | return OK; |
| 74 | } |
| 75 | |
| 76 | // static |
| 77 | std::string SpdyCredentialBuilder::GetCredentialSecret( |
| 78 | const std::string& tls_unique) { |
| 79 | const char prefix[] = "SPDY CREDENTIAL ChannelID\0client -> server"; |
| 80 | std::string secret(prefix, arraysize(prefix)); |
| 81 | secret.append(tls_unique); |
| 82 | |
| 83 | return secret; |
| 84 | } |
| 85 | |
| 86 | } // namespace net |