src/X509.cpp

   1 #include "X509.h"
   2
   3 #include <fstream>
   4 #include <iostream>
   5
   6 #include <openssl/ssl.h>
   7 #include <openssl/bio.h>
   8 #include <openssl/x509v3.h>
   9
  10 X509Req::X509Req( X509_REQ* csr ) {
  11     req = std::shared_ptr<X509_REQ>( csr, X509_REQ_free );
  12     EVP_PKEY* pkt = X509_REQ_get_pubkey( req.get() );
  13
  14     if( !pkt ) {
  15         throw "Error extracting public key";
  16     }
  17
  18     pk = std::shared_ptr<EVP_PKEY>( pkt, EVP_PKEY_free );
  19 }
  20
  21 X509Req::X509Req( std::string spkac ) {
  22     if( spkac.compare( 0, 6, "SPKAC=" ) != 0 ) {
  23         throw "Error: not a SPKAC";
  24     }
  25
  26     spkac = spkac.substr( 6 );
  27     NETSCAPE_SPKI* spki_p = NETSCAPE_SPKI_b64_decode( spkac.c_str(), spkac.size() );
  28
  29     if( !spki_p ) {
  30         throw "Error: decode failed";
  31     }
  32
  33     spki = std::shared_ptr<NETSCAPE_SPKI>( spki_p, NETSCAPE_SPKI_free );
  34     EVP_PKEY* pkt_p = NETSCAPE_SPKI_get_pubkey( spki.get() );
  35
  36     if( !pkt_p ) {
  37         throw "Error: reading SPKAC Pubkey failed";
  38     }
  39
  40     pk = std::shared_ptr<EVP_PKEY>( pkt_p, EVP_PKEY_free );
  41 }
  42
  43 int X509Req::verify() {
  44     if( !req ) {
  45         return NETSCAPE_SPKI_verify( spki.get(), pk.get() );
  46     }
  47
  48     return X509_REQ_verify( req.get(), pk.get() );
  49 }
  50
  51 std::shared_ptr<EVP_PKEY> X509Req::getPkey() {
  52     return pk;
  53 }
  54
  55 std::shared_ptr<X509Req> X509Req::parse( std::string filename ) {
  56     std::shared_ptr<BIO> in = std::shared_ptr<BIO>( BIO_new_mem_buf( const_cast<char*>( filename.c_str() ), -1 ), BIO_free );
  57     X509_REQ* req = PEM_read_bio_X509_REQ( in.get(), NULL, NULL, NULL );
  58
  59     if( !req ) {
  60         throw "Error parsing CSR";
  61     }
  62
  63     return std::shared_ptr<X509Req>( new X509Req( req ) );
  64 }
  65
  66 std::shared_ptr<X509Req> X509Req::parseSPKAC( std::string content ) {
  67     return std::shared_ptr<X509Req>( new X509Req( content ) );
  68 }
  69
  70 int add_ext( std::shared_ptr<X509> issuer, std::shared_ptr<X509> subj, int nid, const char* value ) {
  71     X509_EXTENSION* ex;
  72     X509V3_CTX ctx;
  73
  74     /* This sets the 'context' of the extensions. */
  75     /* No configuration database */
  76     X509V3_set_ctx_nodb( &ctx );
  77
  78     /* Issuer and subject certs: both the target since it is self signed,
  79      * no request and no CRL
  80      */
  81     X509V3_set_ctx( &ctx, issuer.get(), subj.get(), NULL, NULL, 0 );
  82     ex = X509V3_EXT_conf_nid( NULL, &ctx, nid, const_cast<char*>( value ) );
  83
  84     if( !ex ) {
  85         return 0;
  86     }
  87
  88     X509_add_ext( subj.get(), ex, -1 );
  89     X509_EXTENSION_free( ex );
  90
  91     return 1;
  92 }
  93
  94 X509Cert::X509Cert() {
  95     X509* c = X509_new();
  96
  97     if( !c ) {
  98         throw "malloc failed";
  99     }
 100
 101     target = std::shared_ptr<X509>( c, X509_free );
 102
 103     if( !X509_set_version( c, 2 ) ) {
 104         throw "Setting X509-version to 3 failed";
 105     }
 106 }
 107
 108 void X509Cert::setIssuerNameFrom( std::shared_ptr<X509> caCert ) {
 109     if( !X509_set_issuer_name( target.get(), X509_get_subject_name( caCert.get() ) ) ) {
 110         throw "Error setting Issuer name";
 111     }
 112 }
 113
 114 void X509Cert::setPubkeyFrom( std::shared_ptr<X509Req> req ) {
 115     std::shared_ptr<EVP_PKEY> pktmp = req->getPkey();
 116
 117     if( !X509_set_pubkey( target.get(), pktmp.get() ) ) {
 118         throw "Setting public key failed.";
 119     }
 120 }
 121
 122 void X509Cert::setSerialNumber( int num ) {
 123     ASN1_INTEGER_set( target.get()->cert_info->serialNumber, num );
 124 }
 125
 126 void X509Cert::setTimes( uint32_t before, uint32_t after ) {
 127     X509_gmtime_adj( X509_get_notBefore( target.get() ), before );
 128     X509_gmtime_adj( X509_get_notAfter( target.get() ), after );
 129 }
 130
 131 static X509_EXTENSION* do_ext_i2d( int ext_nid, int crit, ASN1_VALUE* ext_struc ) {
 132     unsigned char* ext_der;
 133     int ext_len;
 134     ASN1_OCTET_STRING* ext_oct;
 135     X509_EXTENSION* ext;
 136     /* Convert internal representation to DER */
 137     ext_der = NULL;
 138     ext_len = ASN1_item_i2d( ext_struc, &ext_der, ASN1_ITEM_ptr( ASN1_ITEM_ref( GENERAL_NAMES ) ) );
 139
 140     if( ext_len < 0 ) {
 141         goto merr;
 142     }
 143
 144     if( !( ext_oct = M_ASN1_OCTET_STRING_new() ) ) {
 145         goto merr;
 146     }
 147
 148     ext_oct->data = ext_der;
 149     ext_oct->length = ext_len;
 150
 151     ext = X509_EXTENSION_create_by_NID( NULL, ext_nid, crit, ext_oct );
 152
 153     if( !ext ) {
 154         goto merr;
 155     }
 156
 157     M_ASN1_OCTET_STRING_free( ext_oct );
 158     return ext;
 159
 160 merr:
 161     throw "memerr";
 162 }
 163
 164 void X509Cert::setExtensions( std::shared_ptr<X509> caCert, std::vector<std::shared_ptr<SAN>>& sans ) {
 165     add_ext( caCert, target, NID_basic_constraints, "critical,CA:FALSE" );
 166     add_ext( caCert, target, NID_subject_key_identifier, "hash" );
 167     add_ext( caCert, target, NID_authority_key_identifier, "keyid,issuer:always" );
 168     add_ext( caCert, target, NID_key_usage, "critical,nonRepudiation,digitalSignature,keyEncipherment" );
 169     add_ext( caCert, target, NID_ext_key_usage, "clientAuth, serverAuth" );
 170     add_ext( caCert, target, NID_info_access, "OCSP;URI:http://ocsp.cacert.org" );
 171     add_ext( caCert, target, NID_crl_distribution_points, "URI:http://crl.cacert.org/class3-revoke.crl" );
 172
 173     std::shared_ptr<GENERAL_NAMES> gens = std::shared_ptr<GENERAL_NAMES>(
 174         sk_GENERAL_NAME_new_null(),
 175         []( GENERAL_NAMES * ref ) {
 176             if( ref ) {
 177                 sk_GENERAL_NAME_pop_free( ref, GENERAL_NAME_free );
 178             }
 179         } );
 180
 181     for( auto& name : sans ) {
 182         GENERAL_NAME* gen = GENERAL_NAME_new();
 183
 184         if( !gen ) {
 185             throw "Malloc failure.";
 186         }
 187
 188         gen->type = name->type == "DNS" ? GEN_DNS : name->type == "email" ? GEN_EMAIL : 0; // GEN_EMAIL;
 189
 190         if( !gen->type
 191                 || !( gen->d.ia5 = M_ASN1_IA5STRING_new() )
 192                 || !ASN1_STRING_set( gen->d.ia5, name->content.data(), name->content.size() ) ) {
 193             GENERAL_NAME_free( gen );
 194             throw "initing iasting5 failed";
 195         }
 196
 197         sk_GENERAL_NAME_push( gens.get(), gen );
 198     }
 199
 200     X509_EXTENSION* ext = do_ext_i2d( NID_subject_alt_name, 0/*critical*/, ( ASN1_VALUE* )gens.get() );
 201
 202     X509_add_ext( target.get(), ext, -1 );
 203     X509_EXTENSION_free( ext );
 204 }
 205
 206 std::shared_ptr<SignedCertificate> X509Cert::sign( std::shared_ptr<EVP_PKEY> caKey ) {
 207     if( !X509_sign( target.get(), caKey.get(), EVP_sha512() ) ) {
 208         throw "Signing failed.";
 209     }
 210
 211     //X509_print_fp( stdout, target.get() );
 212
 213     std::shared_ptr<BIO> mem = std::shared_ptr<BIO>( BIO_new( BIO_s_mem() ), BIO_free );
 214     PEM_write_bio_X509( mem.get(), target.get() );
 215     BUF_MEM* buf;
 216     BIO_get_mem_ptr( mem.get(), &buf );
 217     std::shared_ptr<SignedCertificate> res = std::shared_ptr<SignedCertificate>( new SignedCertificate() );
 218     res->certificate = std::string( buf->data, buf->data + buf->length );
 219     res->serial = ASN1_INTEGER_get( target.get()->cert_info->serialNumber );
 220     return res;
 221 }