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[cassiopeia.git] / src / crypto / remoteSigner.cpp
1 #include "remoteSigner.h"
2
3 #include "log/logger.hpp"
4 #include "util.h"
5
6 #include <iostream>
7
8 #include <openssl/ssl.h>
9 #include <openssl/bn.h>
10
11 RemoteSigner::RemoteSigner( std::shared_ptr<BIO> target, std::shared_ptr<SSL_CTX> ctx ) : target( target ), ctx( ctx ) {
12 }
13
14 RemoteSigner::~RemoteSigner() {
15 }
16
17 void RemoteSigner::send( std::shared_ptr<OpensslBIOWrapper> bio, RecordHeader& head, RecordHeader::SignerCommand cmd, std::string data ) {
18     head.command = static_cast<uint16_t>( cmd );
19     head.command_count++;
20     head.totalLength = data.size();
21     sendCommand( head, data, bio );
22 }
23
24 std::shared_ptr<SignedCertificate> RemoteSigner::sign( std::shared_ptr<TBSCertificate> cert ) {
25     ( void )BIO_reset( target.get() );
26
27     std::shared_ptr<SSL> ssl( SSL_new( ctx.get() ), SSL_free );
28     std::shared_ptr<BIO> bio( BIO_new( BIO_f_ssl() ), BIO_free );
29     SSL_set_connect_state( ssl.get() );
30     SSL_set_bio( ssl.get(), target.get(), target.get() );
31     BIO_set_ssl( bio.get(), ssl.get(), BIO_NOCLOSE );
32     auto conn = std::make_shared<OpensslBIOWrapper>( bio );
33     RecordHeader head;
34     head.flags = 0;
35     head.sessid = 13;
36
37     if( cert->csr_type == "CSR" ) {
38         send( conn, head, RecordHeader::SignerCommand::SET_CSR, cert->csr_content );
39     } else if( cert->csr_type == "SPKAC" ) {
40         send( conn, head, RecordHeader::SignerCommand::SET_SPKAC, cert->csr_content );
41     } else {
42         logger::error( "Unknown csr_type: ", cert->csr_type );
43         return nullptr;
44     }
45
46     send( conn, head, RecordHeader::SignerCommand::SET_SIGNATURE_TYPE, cert->md );
47     send( conn, head, RecordHeader::SignerCommand::SET_PROFILE, cert->profile );
48     send( conn, head, RecordHeader::SignerCommand::SET_WISH_FROM, cert->wishFrom );
49     send( conn, head, RecordHeader::SignerCommand::SET_WISH_TO, cert->wishTo );
50
51     for( auto &ava : cert->AVAs ) {
52         if( ava->name.find( "," ) != std::string::npos ) {
53             // invalid ava
54             return nullptr;
55         }
56
57         send( conn, head, RecordHeader::SignerCommand::ADD_AVA, ava->name + "," + ava->value );
58     }
59
60     for( auto &san : cert->SANs ) {
61         if( san->type.find( "," ) != std::string::npos ) {
62             // invalid ava
63             return nullptr;
64         }
65
66         send( conn, head, RecordHeader::SignerCommand::ADD_SAN, san->type + "," + san->content );
67     }
68
69     send( conn, head, RecordHeader::SignerCommand::SIGN, "" );
70     send( conn, head, RecordHeader::SignerCommand::LOG_SAVED, "" );
71     auto result = std::make_shared<SignedCertificate>();
72
73     for( int i = 0; i < 3; i++ ) {
74         try {
75             RecordHeader head;
76             std::string payload = parseCommandChunked( head, conn );
77
78             switch( static_cast<RecordHeader::SignerResult>( head.command ) ) {
79             case RecordHeader::SignerResult::CERTIFICATE:
80                 result->certificate = payload;
81                 break;
82
83             case RecordHeader::SignerResult::SAVE_LOG:
84                 result->log = payload;
85                 break;
86
87             case RecordHeader::SignerResult::SIGNING_CA:
88                 result->ca_name = payload;
89                 break;
90
91             default:
92                 logger::error( "Invalid Message" );
93                 break;
94             }
95         } catch( const std::exception& msg ) {
96             logger::error( msg.what() );
97             return std::shared_ptr<SignedCertificate>();
98         }
99     }
100
101     if( result ) {
102         std::shared_ptr<BIO> bios( BIO_new( BIO_s_mem() ), BIO_free );
103         const char* buf = result->certificate.data();
104         unsigned int len = result->certificate.size();
105
106         while( len > 0 ) {
107             int dlen = BIO_write( bios.get(), buf, len );
108
109             if( dlen <= 0 ) {
110                 throw std::runtime_error( "Memory error." );
111             }
112
113             len -= dlen;
114             buf += dlen;
115         }
116
117         std::shared_ptr<X509> pem( PEM_read_bio_X509( bios.get(), NULL, 0, NULL ), X509_free );
118
119         if( !pem ) {
120             throw std::runtime_error( "Pem was not readable" );
121         }
122
123         std::shared_ptr<BIGNUM> ser( ASN1_INTEGER_to_BN( X509_get_serialNumber( pem.get() ), NULL ), BN_free );
124         std::shared_ptr<char> serStr(
125             BN_bn2hex( ser.get() ),
126             []( char* p ) {
127                 OPENSSL_free( p );
128             } ); // OPENSSL_free is a macro...
129
130         extractTimes( pem, result );
131
132         result->serial = std::string( serStr.get() );
133     }
134
135     logger::note( "Closing SSL connection" );
136
137     if( !SSL_shutdown( ssl.get() ) && !SSL_shutdown( ssl.get() ) ) { // need to close the connection twice
138         logger::warn( "SSL shutdown failed" );
139     }
140
141     logger::note( "SSL connection closed" );
142
143     return result;
144 }
145
146 std::pair<std::shared_ptr<CRL>, std::string> RemoteSigner::revoke( std::shared_ptr<CAConfig> ca, std::vector<std::string> serials ) {
147     ( void )BIO_reset( target.get() );
148
149     std::shared_ptr<SSL> ssl( SSL_new( ctx.get() ), SSL_free );
150     std::shared_ptr<BIO> bio( BIO_new( BIO_f_ssl() ), BIO_free );
151     SSL_set_connect_state( ssl.get() );
152     SSL_set_bio( ssl.get(), target.get(), target.get() );
153     BIO_set_ssl( bio.get(), ssl.get(), BIO_NOCLOSE );
154     auto conn = std::make_shared<OpensslBIOWrapper>( bio );
155
156     RecordHeader head;
157     head.flags = 0;
158     head.sessid = 13;
159
160     for( auto &serial : serials ) {
161         send( conn, head, RecordHeader::SignerCommand::ADD_SERIAL, serial );
162     }
163
164     std::string payload = ca->name;
165     send( conn, head, RecordHeader::SignerCommand::REVOKE, payload );
166
167     payload = parseCommandChunked( head, conn );
168
169     std::string tgtName = ca->path + std::string( "/ca.crl" );
170     auto crl = std::make_shared<CRL>( tgtName );
171     std::string date;
172
173     if( static_cast<RecordHeader::SignerResult>( head.command ) != RecordHeader::SignerResult::REVOKED ) {
174         throw std::runtime_error( "Protocol violation" );
175     }
176
177     const unsigned char* buffer2 = reinterpret_cast<const unsigned char*>( payload.data() );
178     const unsigned char* pos = buffer2;
179     ASN1_TIME* time = d2i_ASN1_TIME( NULL, &pos, payload.size() );
180     ASN1_TIME_free( time );
181     date = payload.substr( 0, pos - buffer2 );
182     std::string rest = payload.substr( pos - buffer2 );
183
184     for( std::string &serial : serials ) {
185         crl->revoke( serial, date );
186     }
187
188     crl->setSignature( rest );
189     bool ok = crl->verify( ca );
190
191     if( ok ) {
192         logger::note( "CRL verificated successfully" );
193         writeFile( tgtName, crl->toString() );
194     } else {
195         logger::warn( "CRL is broken, trying to recover" );
196         send( conn, head, RecordHeader::SignerCommand::GET_FULL_CRL, ca->name );
197
198         payload = parseCommandChunked( head, conn );
199
200         if( static_cast<RecordHeader::SignerResult>( head.command ) != RecordHeader::SignerResult::FULL_CRL ) {
201             throw std::runtime_error( "Protocol violation" );
202         }
203
204         std::string name_bak = ca->path + std::string( "/ca.crl.bak" );
205         writeFile( name_bak, payload );
206         crl = std::make_shared<CRL>( name_bak );
207
208         if( crl->verify( ca ) ) {
209             if( rename( name_bak.c_str(), tgtName.c_str() ) != 0 ) {
210                 logger::warn( "Moving new CRL over old CRL failed" );
211             }
212
213             logger::note( "CRL is now valid again" );
214         } else {
215             logger::warn( "CRL is still broken... Please, help me" );
216         }
217     }
218
219     logger::note( "Closing SSL connection" );
220
221     if( !SSL_shutdown( ssl.get() ) && !SSL_shutdown( ssl.get() ) ) { // need to close the connection twice
222         logger::warn( "SSL shutdown failed" );
223     }
224
225     logger::note( "SSL connection closed" );
226
227     return { crl, date };
228 }
229
230 void RemoteSigner::setLog( std::shared_ptr<std::ostream> target ) {
231     this->log = target;
232 }