PublicKey.cc

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/*---------------------------------------------------------------------\
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|                         |__  / \ / / . \ . \                         |
|                           / / \ V /|  _/  _/                         |
|                          / /__ | | | | | |                           |
|                         /_____||_| |_| |_|                           |
|                                                                      |
\---------------------------------------------------------------------*/
#include <climits>

#include <iostream>
#include <vector>

#include "zypp/base/Gettext.h"
#include "zypp/base/String.h"
#include "zypp/base/Regex.h"
#include "zypp/PublicKey.h"
#include "zypp/ExternalProgram.h"
#include "zypp/TmpPath.h"
#include "zypp/PathInfo.h"
#include "zypp/base/Exception.h"
#include "zypp/base/LogTools.h"
#include "zypp/Date.h"
#include "zypp/TmpPath.h"

#include <ctime>

#define GPG_BINARY "/usr/bin/gpg2"

using std::endl;

namespace zypp
{
  namespace
  {
    inline bool isExpired( const Date & expires_r )
    { return( expires_r && expires_r < Date::now() ); }

    inline int hasDaysToLive( const Date & expires_r )
    {
      if ( expires_r )
      {
        Date exp( expires_r - Date::now() );
        int ret = exp / Date::day;
        if ( exp < 0 ) ret -= 1;
        return ret;
      }
      return INT_MAX;
    }

    inline std::string expiresDetail( const Date & expires_r )
    {
      str::Str str;
      if ( ! expires_r )
      {
        // translators: an annotation to a gpg keys expiry date
        str << _("does not expire");
      }
      else if ( isExpired( expires_r ) )
      {
        // translators: an annotation to a gpg keys expiry date: "expired: 1999-04-12"
        str << ( str::Format(_("expired: %1%") ) % expires_r.printDate() );
      }
      else
      {
        // translators: an annotation to a gpg keys expiry date: "expires: 2111-04-12"
        str << ( str::Format(_("expires: %1%") ) % expires_r.printDate() );
      }
      return str;
    }

    inline std::string expiresDetailVerbose( const Date & expires_r )
    {
      if ( !expires_r )
      { // translators: an annotation to a gpg keys expiry date
        return _("(does not expire)");
      }
      std::string ret( expires_r.asString() );
      int ttl( hasDaysToLive( expires_r ) );
      if ( ttl <= 90 )
      {
        ret += " ";
        if ( ttl < 0 )
        { // translators: an annotation to a gpg keys expiry date
          ret += _("(EXPIRED)");
        }
        else if ( ttl == 0 )
        { // translators: an annotation to a gpg keys expiry date
          ret += _("(expires within 24h)");
        }
        else
        { // translators: an annotation to a gpg keys expiry date
          ret += str::form( _PL("(expires in %d day)", "(expires in %d days)", ttl ), ttl );
        }
      }
      return ret;
    }

  } //namespace

  struct PublicSubkeyData::Impl
  {
    std::string _id;
    Date        _created;
    Date        _expires;

  public:
    static shared_ptr<Impl> nullimpl()
    {
      static shared_ptr<Impl> _nullimpl( new Impl );
      return _nullimpl;
    }

  private:
    friend Impl * rwcowClone<Impl>( const Impl * rhs );
    Impl * clone() const
    { return new Impl( *this ); }
  };


  PublicSubkeyData::PublicSubkeyData()
    : _pimpl( Impl::nullimpl() )
  {}

  PublicSubkeyData::~PublicSubkeyData()
  {}

  PublicSubkeyData::operator bool() const
  { return !_pimpl->_id.empty(); }

  std::string PublicSubkeyData::id() const
  { return _pimpl->_id; }

  Date PublicSubkeyData::created() const
  { return _pimpl->_created; }

  Date PublicSubkeyData::expires() const
  { return _pimpl->_expires; }

  bool PublicSubkeyData::expired() const
  { return isExpired( _pimpl->_expires ); }

  int PublicSubkeyData::daysToLive() const
  { return hasDaysToLive( _pimpl->_expires ); }

  std::string PublicSubkeyData::asString() const
  {
    return str::Str() << id() << " " << created().printDate() << " [" << expiresDetail( expires() ) << "]";
  }

  struct PublicKeyData::Impl
  {
    std::string _id;
    std::string _name;
    std::string _fingerprint;
    Date        _created;
    Date        _expires;

    std::vector<PublicSubkeyData> _subkeys;

  public:
    bool hasSubkeyId( const std::string & id_r ) const
    {
      bool ret = false;
      for ( const PublicSubkeyData & sub : _subkeys )
      {
        if ( sub.id() == id_r )
        {
          ret = true;
          break;
        }
      }
      return ret;
    }

  public:
    static shared_ptr<Impl> nullimpl()
    {
      static shared_ptr<Impl> _nullimpl( new Impl );
      return _nullimpl;
    }

  private:
    friend Impl * rwcowClone<Impl>( const Impl * rhs );
    Impl * clone() const
    { return new Impl( *this ); }
  };


  PublicKeyData::PublicKeyData()
    : _pimpl( Impl::nullimpl() )
  {}

  PublicKeyData::~PublicKeyData()
  {}

  PublicKeyData::operator bool() const
  { return !_pimpl->_fingerprint.empty(); }

  std::string PublicKeyData::id() const
  { return _pimpl->_id; }

  std::string PublicKeyData::name() const
  { return _pimpl->_name; }

  std::string PublicKeyData::fingerprint() const
  { return _pimpl->_fingerprint; }

  Date PublicKeyData::created() const
  { return _pimpl->_created; }

  Date PublicKeyData::expires() const
  { return _pimpl->_expires; }

  bool PublicKeyData::expired() const
  { return isExpired( _pimpl->_expires ); }

  int PublicKeyData::daysToLive() const
  { return hasDaysToLive( _pimpl->_expires ); }

  std::string PublicKeyData::expiresAsString() const
  { return expiresDetailVerbose( _pimpl->_expires ); }

  std::string PublicKeyData::gpgPubkeyVersion() const
  { return _pimpl->_id.empty() ? _pimpl->_id : str::toLower( _pimpl->_id.substr(8,8) ); }

  std::string PublicKeyData::gpgPubkeyRelease() const
  { return _pimpl->_created ? str::hexstring( _pimpl->_created ).substr(2) : std::string(); }

  std::string PublicKeyData::asString() const
  {
    str::Str str;
    str << "[" << _pimpl->_id << "-" << gpgPubkeyRelease();
    for ( auto && sub : _pimpl->_subkeys )
      str << ", " << sub.id();
    return str << "] [" << _pimpl->_name.c_str() << "] [" << expiresDetail( _pimpl->_expires ) << "]";
  }

  bool PublicKeyData::hasSubkeys() const
  { return !_pimpl->_subkeys.empty(); }

  Iterable<PublicKeyData::SubkeyIterator> PublicKeyData::subkeys() const
  { return makeIterable( &(*_pimpl->_subkeys.begin()), &(*_pimpl->_subkeys.end()) ); }

  bool PublicKeyData::providesKey( const std::string & id_r ) const
  { return( id_r == _pimpl->_id || _pimpl->hasSubkeyId( id_r ) ); }

  std::ostream & dumpOn( std::ostream & str, const PublicKeyData & obj )
  {
    str << "[" << obj.name() << "]" << endl;
    str << "  fpr " << obj.fingerprint() << endl;
    str << "   id " << obj.id() << endl;
    str << "  cre " << Date::ValueType(obj.created()) << ' ' << obj.created() << endl;
    str << "  exp " << Date::ValueType(obj.expires()) << ' ' << obj.expiresAsString() << endl;
    str << "  ttl " << obj.daysToLive() << endl;
    for ( auto && sub : obj._pimpl->_subkeys )
      str << "  sub " << sub << endl;
    str << "  rpm " << obj.gpgPubkeyVersion() << "-" << obj.gpgPubkeyRelease() << endl;
    return str;
  }

  bool operator==( const PublicKeyData & lhs, const PublicKeyData & rhs )
  { return ( lhs.fingerprint() == rhs.fingerprint() && lhs.created() == rhs.created() ); }


  struct PublicKeyScanner::Impl
  {
    enum { pNONE, pPUB, pSIG, pFPR, pUID, pSUB } _parseEntry;
    std::vector<std::string> _words;
    PublicKeyData::Impl * _keyDataPtr;

   Impl()
      : _parseEntry( pNONE )
      , _keyDataPtr( nullptr )
    {}

    void scan( std::string & line_r, std::list<PublicKeyData> & keys_r )
    {
      // pub:-:1024:17:A84EDAE89C800ACA:971961473:1214043198::-:SuSE Package Signing Key <build@suse.de>:
      // fpr:::::::::79C179B2E1C820C1890F9994A84EDAE89C800ACA:
      // sig:::17:A84EDAE89C800ACA:1087899198:::::[selfsig]::13x:
      // sig:::17:9E40E310000AABA4:980442706::::[User ID not found]:10x:
      // sig:::1:77B2E6003D25D3D9:980443247::::[User ID not found]:10x:
      // sig:::17:A84EDAE89C800ACA:1318348291:::::[selfsig]::13x:
      // sub:-:2048:16:197448E88495160C:971961490:1214043258::: [expires: 2008-06-21]
      // sig:::17:A84EDAE89C800ACA:1087899258:::::[keybind]::18x:
      if ( line_r.empty() )
        return;

      // quick check for interesting entries, no parsing in subkeys
      _parseEntry = pNONE;
      switch ( line_r[0] )
      {
        case 'p':
          if ( line_r[1] == 'u' && line_r[2] == 'b' && line_r[3] == ':' )
          {
            _parseEntry = pPUB;
            keys_r.push_back( PublicKeyData() );        // reset upon new key
            _keyDataPtr = keys_r.back()._pimpl.get();
          }
          break;

        case 'f':
          if ( line_r[1] == 'p' && line_r[2] == 'r' && line_r[3] == ':' )
            _parseEntry = pFPR;
          break;

        case 'u':
          if ( line_r[1] == 'i' && line_r[2] == 'd' && line_r[3] == ':' )
            _parseEntry = pUID;
          break;

        case 's':
          if ( line_r[1] == 'i' && line_r[2] == 'g' && line_r[3] == ':' )
            _parseEntry = pSIG;
          else if ( line_r[1] == 'u' && line_r[2] == 'b' && line_r[3] == ':' )
            _parseEntry = pSUB;
          break;

        default:
          return;
      }
      if ( _parseEntry == pNONE )
        return;
      if ( ! ( _keyDataPtr->_subkeys.empty() || _parseEntry == pSUB ) )
        return; // collecting subkeys only

      if ( line_r[line_r.size()-1] == '\n' )
        line_r.erase( line_r.size()-1 );
      //DBG << line_r << endl;

      _words.clear();
      str::splitFields( line_r, std::back_inserter(_words), ":" );

      switch ( _parseEntry )
      {
        case pPUB:
          _keyDataPtr->_id      = _words[4];
          _keyDataPtr->_name    = str::replaceAll( _words[9], "\\x3a", ":" );
          _keyDataPtr->_created = Date(str::strtonum<Date::ValueType>(_words[5]));
          _keyDataPtr->_expires = Date(str::strtonum<Date::ValueType>(_words[6]));
          break;

        case pSIG:
          // Update creation/modification date from signatures type "13x".
          if ( ( _words.size() > 10 && _words[10] == "13x" && !_words[9].empty() && _words[9] != "[User ID not found]" )
            || ( _words.size() > 12 && _words[12] == "13x" /* [selfsig] */) )
          {
            Date cdate(str::strtonum<Date::ValueType>(_words[5]));
            if ( _keyDataPtr->_created < cdate )
              _keyDataPtr->_created = cdate;
          }
          break;

        case pFPR:
          if ( _keyDataPtr->_fingerprint.empty() )
            _keyDataPtr->_fingerprint = _words[9];
          break;

        case pUID:
          if ( ! _words[9].empty() && _words[9] != "[User ID not found]" )
            _keyDataPtr->_name = str::replaceAll( _words[9], "\\x3a", ":" );
          break;

        case pSUB:
          _keyDataPtr->_subkeys.push_back( PublicSubkeyData() );
          {
            PublicSubkeyData::Impl * subPtr = _keyDataPtr->_subkeys.back()._pimpl.get();
            subPtr->_id      = _words[4];
            subPtr->_created = Date(str::strtonum<Date::ValueType>(_words[5]));
            subPtr->_expires = Date(str::strtonum<Date::ValueType>(_words[6]));
          }
          break;

        case pNONE:
          break;        // intentionally no default:
      }
    }
  };

  // class PublicKeyScanner

  PublicKeyScanner::PublicKeyScanner()
    : _pimpl( new Impl )
  {}

  PublicKeyScanner::~PublicKeyScanner()
  {}

  void PublicKeyScanner::scan( std::string line_r )
  { _pimpl->scan( line_r, _keys ); }


  struct PublicKey::Impl
  {
    Impl()
    {}

    Impl( const Pathname & keyFile_r )
    {
      PathInfo info( keyFile_r );
      MIL << "Taking pubkey from " << keyFile_r << " of size " << info.size() << " and sha1 " << filesystem::checksum(keyFile_r, "sha1") << endl;

      if ( !info.isExist() )
        ZYPP_THROW(Exception("Can't read public key from " + keyFile_r.asString() + ", file not found"));

      if ( filesystem::hardlinkCopy( keyFile_r, _dataFile.path() ) != 0 )
        ZYPP_THROW(Exception("Can't copy public key data from " + keyFile_r.asString() + " to " +  _dataFile.path().asString() ));

      readFromFile();
    }

    Impl( const filesystem::TmpFile & sharedFile_r )
      : _dataFile( sharedFile_r )
    { readFromFile(); }

    Impl( const filesystem::TmpFile & sharedFile_r, const PublicKeyData & keyData_r )
      : _dataFile( sharedFile_r )
      , _keyData( keyData_r )
    {
      if ( ! keyData_r )
      {
        WAR << "Invalid PublicKeyData supplied: scanning from file" << endl;
        readFromFile();
      }
    }

    public:
      const PublicKeyData & keyData() const
      { return _keyData; }

      Pathname path() const
      { return _dataFile.path(); }

      const std::list<PublicKeyData> & hiddenKeys() const
      { return _hiddenKeys; }

    protected:
      void readFromFile()
      {
        PathInfo info( _dataFile.path() );
        MIL << "Reading pubkey from " << info.path() << " of size " << info.size() << " and sha1 " << filesystem::checksum(info.path(), "sha1") << endl;

        static filesystem::TmpDir dir;
        std::string tmppath( dir.path().asString() );
        std::string datapath( _dataFile.path().asString() );

        const char* argv[] =
        {
          GPG_BINARY,
          "-v",
          "--no-default-keyring",
          "--fixed-list-mode",
          "--with-fingerprint",
          "--with-colons",
          "--homedir",
          tmppath.c_str(),
          "--quiet",
          "--no-tty",
          "--no-greeting",
          "--batch",
          "--status-fd", "1",
          datapath.c_str(),
          NULL
        };
        ExternalProgram prog( argv, ExternalProgram::Discard_Stderr, false, -1, true );

        PublicKeyScanner scanner;
        for ( std::string line = prog.receiveLine(); !line.empty(); line = prog.receiveLine() )
        {
          scanner.scan( line );
        }
        int ret = prog.close();

        switch ( scanner._keys.size() )
        {
          case 0:
            if ( ret == 129 )
              ZYPP_THROW( Exception( std::string("Can't read public key data: ") + GPG_BINARY + " is not installed!" ) );
            else
              ZYPP_THROW( BadKeyException( "File " + _dataFile.path().asString() + " doesn't contain public key data" , _dataFile.path() ) );
            break;

          case 1:
            // ok.
            _keyData = scanner._keys.back();
            _hiddenKeys.clear();
            break;

          default:
            WAR << "File " << _dataFile.path().asString() << " contains multiple keys: " <<  scanner._keys << endl;
            _keyData = scanner._keys.back();
            scanner._keys.pop_back();
            _hiddenKeys.swap( scanner._keys );
            break;
        }

        MIL << "Read pubkey from " << info.path() << ": " << _keyData << endl;
      }

    private:
      filesystem::TmpFile       _dataFile;
      PublicKeyData             _keyData;
      std::list<PublicKeyData>  _hiddenKeys;

    public:
      static shared_ptr<Impl> nullimpl()
      {
        static shared_ptr<Impl> _nullimpl( new Impl );
        return _nullimpl;
      }

    private:
      friend Impl * rwcowClone<Impl>( const Impl * rhs );
      Impl * clone() const
      { return new Impl( *this ); }
  };

  // class PublicKey
  PublicKey::PublicKey()
  : _pimpl( Impl::nullimpl() )
  {}

  PublicKey::PublicKey( const Pathname & file )
  : _pimpl( new Impl( file ) )
  {}

  PublicKey::PublicKey( const filesystem::TmpFile & sharedfile )
  : _pimpl( new Impl( sharedfile ) )
  {}

  PublicKey::PublicKey( const filesystem::TmpFile & sharedfile, const PublicKeyData & keydata )
  : _pimpl( new Impl( sharedfile, keydata ) )
  {}

  PublicKey::~PublicKey()
  {}

  const PublicKeyData & PublicKey::keyData() const
  { return _pimpl->keyData(); }

  Pathname PublicKey::path() const
  { return _pimpl->path(); }

  const std::list<PublicKeyData> & PublicKey::hiddenKeys() const
  { return _pimpl->hiddenKeys(); }

  std::string PublicKey::id() const
  { return keyData().id(); }

  std::string PublicKey::name() const
  { return keyData().name(); }

  std::string PublicKey::fingerprint() const
  { return keyData().fingerprint(); }

  Date PublicKey::created() const
  { return keyData().created(); }

  Date PublicKey::expires() const
  { return keyData().expires(); }

  bool PublicKey::expired() const
  { return keyData().expired(); }

  int PublicKey::daysToLive() const
  { return keyData().daysToLive(); }

  std::string PublicKey::expiresAsString() const
  { return keyData().expiresAsString(); }

  std::string PublicKey::gpgPubkeyVersion() const
  { return keyData().gpgPubkeyVersion(); }

  std::string PublicKey::gpgPubkeyRelease() const
  { return keyData().gpgPubkeyRelease(); }

  std::string PublicKey::asString() const
  { return keyData().asString(); }

  bool PublicKey::operator==( const PublicKey & rhs ) const
  { return rhs.keyData() == keyData(); }

  bool PublicKey::operator==( const std::string & sid ) const
  { return sid == id(); }

  std::ostream & dumpOn( std::ostream & str, const PublicKey & obj )
  { return dumpOn( str, obj.keyData() ); }

} // namespace zypp