KeyRing.cc

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#include <iostream>
#include <fstream>
#include <sys/file.h>
#include <cstdio>
#include <unistd.h>

#include "zypp/TmpPath.h"
#include "zypp/ZYppFactory.h"
#include "zypp/ZYpp.h"

#include "zypp/base/LogTools.h"
#include "zypp/base/IOStream.h"
#include "zypp/base/String.h"
#include "zypp/base/Regex.h"
#include "zypp/base/Gettext.h"
#include "zypp/base/WatchFile.h"
#include "zypp/PathInfo.h"
#include "zypp/KeyRing.h"
#include "zypp/ExternalProgram.h"
#include "zypp/TmpPath.h"

using std::endl;

#undef  ZYPP_BASE_LOGGER_LOGGROUP
#define ZYPP_BASE_LOGGER_LOGGROUP "zypp::KeyRing"

#define GPG_BINARY "/usr/bin/gpg2"

namespace zypp
{ 

  IMPL_PTR_TYPE(KeyRing);

  namespace
  {
    KeyRing::DefaultAccept _keyRingDefaultAccept( KeyRing::ACCEPT_NOTHING );
  }

  KeyRing::DefaultAccept KeyRing::defaultAccept()
  { return _keyRingDefaultAccept; }

  void KeyRing::setDefaultAccept( DefaultAccept value_r )
  {
    MIL << "Set new KeyRing::DefaultAccept: " << value_r << endl;
    _keyRingDefaultAccept = value_r;
  }

  void KeyRingReport::infoVerify( const std::string & file_r, const PublicKeyData & keyData_r, const KeyContext & keycontext )
  {}

  bool KeyRingReport::askUserToAcceptUnsignedFile( const std::string & file, const KeyContext & keycontext )
  { return _keyRingDefaultAccept.testFlag( KeyRing::ACCEPT_UNSIGNED_FILE ); }

  KeyRingReport::KeyTrust
  KeyRingReport::askUserToAcceptKey( const PublicKey & key, const KeyContext & keycontext )
  {
    if ( _keyRingDefaultAccept.testFlag( KeyRing::TRUST_KEY_TEMPORARILY ) )
      return KEY_TRUST_TEMPORARILY;
    if ( _keyRingDefaultAccept.testFlag( KeyRing::TRUST_AND_IMPORT_KEY ) )
      return KEY_TRUST_AND_IMPORT;
    return KEY_DONT_TRUST;
  }

  bool KeyRingReport::askUserToAcceptUnknownKey( const std::string & file, const std::string & id, const KeyContext & keycontext )
  { return _keyRingDefaultAccept.testFlag( KeyRing::ACCEPT_UNKNOWNKEY ); }

  bool KeyRingReport::askUserToAcceptVerificationFailed( const std::string & file, const PublicKey & key, const KeyContext & keycontext )
  { return _keyRingDefaultAccept.testFlag( KeyRing::ACCEPT_VERIFICATION_FAILED ); }

  namespace
  {
    struct CachedPublicKeyData // : private base::NonCopyable - but KeyRing uses RWCOW though also NonCopyable :(
    {
      const std::list<PublicKeyData> & operator()( const Pathname & keyring_r ) const
      { return getData( keyring_r ); }

    private:
      struct Cache
      {
        // Empty copy ctor to allow insert into std::map as
        // scoped_ptr is noncopyable.
        Cache() {}
        Cache( const Cache & rhs ) {}

        void assertCache( const Pathname & keyring_r )
        {
          // .kbx since gpg2-2.1
          if ( !_keyringK )
            _keyringK.reset( new WatchFile( keyring_r/"pubring.kbx", WatchFile::NO_INIT ) );
          if ( !_keyringP )
            _keyringP.reset( new WatchFile( keyring_r/"pubring.gpg", WatchFile::NO_INIT ) );
        }

        bool hasChanged() const
        {
          bool k = _keyringK->hasChanged();     // be sure both files are checked
          bool p = _keyringP->hasChanged();
          return k || p;
        }

        std::list<PublicKeyData> _data;

      private:
        scoped_ptr<WatchFile> _keyringK;
        scoped_ptr<WatchFile> _keyringP;
      };

      typedef std::map<Pathname,Cache> CacheMap;

      const std::list<PublicKeyData> & getData( const Pathname & keyring_r ) const
      {
        Cache & cache( _cacheMap[keyring_r] );
        // init new cache entry
        cache.assertCache( keyring_r );
        return getData( keyring_r, cache );
      }

      const std::list<PublicKeyData> & getData( const Pathname & keyring_r, Cache & cache_r ) const
      {
        if ( cache_r.hasChanged() )
        {
          const char* argv[] =
          {
            GPG_BINARY,
            "--list-public-keys",
            "--homedir", keyring_r.c_str(),
            "--no-default-keyring",
            "--quiet",
            "--with-colons",
            "--fixed-list-mode",
            "--with-fingerprint",
            "--with-sig-list",
            "--no-tty",
            "--no-greeting",
            "--batch",
            "--status-fd", "1",
            NULL
          };

          PublicKeyScanner scanner;
          ExternalProgram prog( argv ,ExternalProgram::Discard_Stderr, false, -1, true );
          for( std::string line = prog.receiveLine(); !line.empty(); line = prog.receiveLine() )
          {
            scanner.scan( line );
          }
          prog.close();

          cache_r._data.swap( scanner._keys );
          MIL << "Found keys: " << cache_r._data  << endl;
        }
        return cache_r._data;
      }

      mutable CacheMap _cacheMap;
    };
  }

  //
  //    CLASS NAME : KeyRing::Impl
  //
  struct KeyRing::Impl
  {
    Impl( const Pathname & baseTmpDir )
    : _trusted_tmp_dir( baseTmpDir, "zypp-trusted-kr" )
    , _general_tmp_dir( baseTmpDir, "zypp-general-kr" )
    , _base_dir( baseTmpDir )
    {
      MIL << "Current KeyRing::DefaultAccept: " << _keyRingDefaultAccept << endl;
    }

    void importKey( const PublicKey & key, bool trusted = false );
    void multiKeyImport( const Pathname & keyfile_r, bool trusted_r = false );
    void deleteKey( const std::string & id, bool trusted );

    std::string readSignatureKeyId( const Pathname & signature );

    bool isKeyTrusted( const std::string & id )
    { return bool(publicKeyExists( id, trustedKeyRing() )); }
    bool isKeyKnown( const std::string & id )
    { return publicKeyExists( id, trustedKeyRing() ) || publicKeyExists( id, generalKeyRing() ); }

    std::list<PublicKey> trustedPublicKeys()
    { return publicKeys( trustedKeyRing() ); }
    std::list<PublicKey> publicKeys()
    { return publicKeys( generalKeyRing() ); }

    const std::list<PublicKeyData> & trustedPublicKeyData()
    { return publicKeyData( trustedKeyRing() ); }
    const std::list<PublicKeyData> & publicKeyData()
    { return publicKeyData( generalKeyRing() ); }

    void dumpPublicKey( const std::string & id, bool trusted, std::ostream & stream )
    { dumpPublicKey( id, ( trusted ? trustedKeyRing() : generalKeyRing() ), stream ); }

    PublicKey exportPublicKey( const PublicKeyData & keyData )
    { return exportKey( keyData, generalKeyRing() ); }
    PublicKey exportTrustedPublicKey( const PublicKeyData & keyData )
    { return exportKey( keyData, trustedKeyRing() ); }

    bool verifyFileSignatureWorkflow( const Pathname & file, const std::string & filedesc, const Pathname & signature, bool & sigValid_r, const KeyContext & keycontext = KeyContext());

    bool verifyFileSignature( const Pathname & file, const Pathname & signature )
    { return verifyFile( file, signature, generalKeyRing() ); }
    bool verifyFileTrustedSignature( const Pathname & file, const Pathname & signature )
    { return verifyFile( file, signature, trustedKeyRing() ); }

  private:
    bool verifyFile( const Pathname & file, const Pathname & signature, const Pathname & keyring );
    void importKey( const Pathname & keyfile, const Pathname & keyring );

    PublicKey exportKey( const std::string & id, const Pathname & keyring );
    PublicKey exportKey( const PublicKeyData & keyData, const Pathname & keyring );

    void dumpPublicKey( const std::string & id, const Pathname & keyring, std::ostream & stream );
    filesystem::TmpFile dumpPublicKeyToTmp( const std::string & id, const Pathname & keyring );

    void deleteKey( const std::string & id, const Pathname & keyring );

    std::list<PublicKey> publicKeys( const Pathname & keyring);
    const std::list<PublicKeyData> & publicKeyData( const Pathname & keyring )
    { return cachedPublicKeyData( keyring ); }

    PublicKeyData publicKeyExists( const std::string & id, const Pathname & keyring );

    const Pathname generalKeyRing() const
    { return _general_tmp_dir.path(); }
    const Pathname trustedKeyRing() const
    { return _trusted_tmp_dir.path(); }

    // Used for trusted and untrusted keyrings
    filesystem::TmpDir _trusted_tmp_dir;
    filesystem::TmpDir _general_tmp_dir;
    Pathname _base_dir;

  private:
    CachedPublicKeyData cachedPublicKeyData;
  };


  void KeyRing::Impl::importKey( const PublicKey & key, bool trusted )
  {
    importKey( key.path(), trusted ? trustedKeyRing() : generalKeyRing() );

    if ( trusted )
    {
      callback::SendReport<target::rpm::KeyRingSignals> rpmdbEmitSignal;
      callback::SendReport<KeyRingSignals> emitSignal;

      rpmdbEmitSignal->trustedKeyAdded( key );
      emitSignal->trustedKeyAdded( key );
    }
  }

  void KeyRing::Impl::multiKeyImport( const Pathname & keyfile_r, bool trusted_r )
  {
    importKey( keyfile_r, trusted_r ? trustedKeyRing() : generalKeyRing() );
  }

  void KeyRing::Impl::deleteKey( const std::string & id, bool trusted )
  {
    PublicKey key;

    if ( trusted )
    {
        key = exportKey( id, trustedKeyRing() );
    }

    deleteKey( id, trusted ? trustedKeyRing() : generalKeyRing() );

    if ( trusted )
    {
      callback::SendReport<target::rpm::KeyRingSignals> rpmdbEmitSignal;
      callback::SendReport<KeyRingSignals> emitSignal;

      rpmdbEmitSignal->trustedKeyRemoved( key );
      emitSignal->trustedKeyRemoved( key );
    }
  }

  PublicKeyData KeyRing::Impl::publicKeyExists( const std::string & id, const Pathname & keyring )
  {
    MIL << "Searching key [" << id << "] in keyring " << keyring << endl;
    PublicKeyData ret;
    for ( const PublicKeyData & key : publicKeyData( keyring ) )
    {
      if ( key.providesKey( id ) )
      {
        ret = key;
        break;
      }
    }
    return ret;
  }

  PublicKey KeyRing::Impl::exportKey( const PublicKeyData & keyData, const Pathname & keyring )
  {
    return PublicKey( dumpPublicKeyToTmp( keyData.id(), keyring ), keyData );
  }

  PublicKey KeyRing::Impl::exportKey( const std::string & id, const Pathname & keyring )
  {
    PublicKeyData keyData( publicKeyExists( id, keyring ) );
    if ( keyData )
      return PublicKey( dumpPublicKeyToTmp( keyData.id(), keyring ), keyData );

    // Here: key not found
    WAR << "No key " << id << " to export from " << keyring << endl;
    return PublicKey();
  }


  void KeyRing::Impl::dumpPublicKey( const std::string & id, const Pathname & keyring, std::ostream & stream )
  {
    const char* argv[] =
    {
      GPG_BINARY,
      "-a",
      "--export",
      "--homedir", keyring.asString().c_str(),
      "--no-default-keyring",
      "--quiet",
      "--no-tty",
      "--no-greeting",
      "--no-permission-warning",
      "--batch",
      id.c_str(),
      NULL
    };
    ExternalProgram prog( argv,ExternalProgram::Discard_Stderr, false, -1, true );
    for ( std::string line = prog.receiveLine(); !line.empty(); line = prog.receiveLine() )
    {
      stream << line;
    }
    prog.close();
  }

  filesystem::TmpFile KeyRing::Impl::dumpPublicKeyToTmp( const std::string & id, const Pathname & keyring )
  {
    filesystem::TmpFile tmpFile( _base_dir, "pubkey-"+id+"-" );
    MIL << "Going to export key " << id << " from " << keyring << " to " << tmpFile.path() << endl;

    std::ofstream os( tmpFile.path().c_str() );
    dumpPublicKey( id, keyring, os );
    os.close();
    return tmpFile;
  }

  bool KeyRing::Impl::verifyFileSignatureWorkflow( const Pathname & file, const std::string & filedesc, const Pathname & signature, bool & sigValid_r, const KeyContext & context )
  {
    sigValid_r = false; // set true if signature is actually successfully validated!

    callback::SendReport<KeyRingReport> report;
    MIL << "Going to verify signature for " << filedesc << " ( " << file << " ) with " << signature << endl;

    // if signature does not exists, ask user if he wants to accept unsigned file.
    if( signature.empty() || (!PathInfo( signature ).isExist()) )
    {
      bool res = report->askUserToAcceptUnsignedFile( filedesc, context );
      MIL << "askUserToAcceptUnsignedFile: " << res << endl;
      return res;
    }

    // get the id of the signature (it might be a subkey id!)
    std::string id = readSignatureKeyId( signature );

    // does key exists in trusted keyring
    PublicKeyData trustedKeyData( publicKeyExists( id, trustedKeyRing() ) );
    if ( trustedKeyData )
    {
      MIL << "Key is trusted: " << trustedKeyData << endl;

      // lets look if there is an updated key in the
      // general keyring
      PublicKeyData generalKeyData( publicKeyExists( id, generalKeyRing() ) );
      if ( generalKeyData )
      {
        // bnc #393160: Comment #30: Compare at least the fingerprint
        // in case an attacker created a key the the same id.
        //
        // FIXME: bsc#1008325: For keys using subkeys, we'd actually need
        // to compare the subkey sets, to tell whether a key was updated.
        // because created() remains unchanged if the primary key is not touched.
        // For now we wait until a new subkey signs the data and treat it as a
        //  new key (else part below).
        if ( trustedKeyData.fingerprint() == generalKeyData.fingerprint()
           && trustedKeyData.created() < generalKeyData.created() )
        {
          MIL << "Key was updated. Saving new version into trusted keyring: " << generalKeyData << endl;
          importKey( exportKey( generalKeyData, generalKeyRing() ), true );
          trustedKeyData = publicKeyExists( id, trustedKeyRing() ); // re-read: invalidated by import?
        }
      }

      // it exists, is trusted, does it validate?
      report->infoVerify( filedesc, trustedKeyData, context );
      if ( verifyFile( file, signature, trustedKeyRing() ) )
      {
        return (sigValid_r=true);       // signature is actually successfully validated!
      }
      else
      {
        bool res = report->askUserToAcceptVerificationFailed( filedesc, exportKey( trustedKeyData, trustedKeyRing() ), context );
        MIL << "askUserToAcceptVerificationFailed: " << res << endl;
        return res;
      }
    }
    else
    {
      PublicKeyData generalKeyData( publicKeyExists( id, generalKeyRing() ) );
      if ( generalKeyData )
      {
        PublicKey key( exportKey( generalKeyData, generalKeyRing() ) );
        MIL << "Exported key " << id << " to " << key.path() << endl;
        MIL << "Key " << id << " " << key.name() << " is not trusted" << endl;

        // ok the key is not trusted, ask the user to trust it or not
        KeyRingReport::KeyTrust reply = report->askUserToAcceptKey( key, context );
        if ( reply == KeyRingReport::KEY_TRUST_TEMPORARILY ||
            reply == KeyRingReport::KEY_TRUST_AND_IMPORT )
        {
          MIL << "User wants to trust key " << id << " " << key.name() << endl;

          Pathname whichKeyring;
          if ( reply == KeyRingReport::KEY_TRUST_AND_IMPORT )
          {
            MIL << "User wants to import key " << id << " " << key.name() << endl;
            importKey( key, true );
            whichKeyring = trustedKeyRing();
          }
          else
            whichKeyring = generalKeyRing();

          // does it validate?
          report->infoVerify( filedesc, generalKeyData, context );
          if ( verifyFile( file, signature, whichKeyring ) )
          {
            return (sigValid_r=true);   // signature is actually successfully validated!
          }
          else
          {
            bool res = report->askUserToAcceptVerificationFailed( filedesc, key, context );
            MIL << "askUserToAcceptVerificationFailed: " << res << endl;
            return res;
          }
        }
        else
        {
          MIL << "User does not want to trust key " << id << " " << key.name() << endl;
          return false;
        }
      }
      else
      {
        // signed with an unknown key...
        MIL << "File [" << file << "] ( " << filedesc << " ) signed with unknown key [" << id << "]" << endl;
        bool res = report->askUserToAcceptUnknownKey( filedesc, id, context );
        MIL << "askUserToAcceptUnknownKey: " << res << endl;
        return res;
      }
    }
    return false;
  }

  std::list<PublicKey> KeyRing::Impl::publicKeys( const Pathname & keyring )
  {
    const std::list<PublicKeyData> & keys( publicKeyData( keyring ) );
    std::list<PublicKey> ret;

    for_( it, keys.begin(), keys.end() )
    {
      PublicKey key( exportKey( *it, keyring ) );
      ret.push_back( key );
      MIL << "Found key " << key << endl;
    }
    return ret;
  }

  void KeyRing::Impl::importKey( const Pathname & keyfile, const Pathname & keyring )
  {
    if ( ! PathInfo( keyfile ).isExist() )
      // TranslatorExplanation first %s is key name, second is keyring name
      ZYPP_THROW(KeyRingException( str::Format(_("Tried to import not existent key %s into keyring %s"))
                                   % keyfile.asString()
                                   % keyring.asString() ));

    const char* argv[] =
    {
      GPG_BINARY,
      "--import",
      "--homedir", keyring.asString().c_str(),
      "--no-default-keyring",
      "--quiet",
      "--no-tty",
      "--no-greeting",
      "--no-permission-warning",
      "--status-fd", "1",
      keyfile.asString().c_str(),
      NULL
    };

    ExternalProgram prog( argv,ExternalProgram::Discard_Stderr, false, -1, true );
    prog.close();
  }

  void KeyRing::Impl::deleteKey( const std::string & id, const Pathname & keyring )
  {
    const char* argv[] =
    {
      GPG_BINARY,
      "--delete-keys",
      "--homedir", keyring.asString().c_str(),
      "--no-default-keyring",
      "--yes",
      "--quiet",
      "--no-tty",
      "--batch",
      "--status-fd", "1",
      id.c_str(),
      NULL
    };

    ExternalProgram prog( argv,ExternalProgram::Discard_Stderr, false, -1, true );

    int code = prog.close();
    if ( code )
      ZYPP_THROW(Exception(_("Failed to delete key.")));
    else
      MIL << "Deleted key " << id << " from keyring " << keyring << endl;
  }

  std::string KeyRing::Impl::readSignatureKeyId( const Pathname & signature )
  {
    if ( ! PathInfo( signature ).isFile() )
      ZYPP_THROW(Exception( str::Format(_("Signature file %s not found")) % signature.asString() ));

    MIL << "Determining key id of signature " << signature << endl;
    const char* argv[] =
    {
      GPG_BINARY,
      "--list-packets",
      signature.asString().c_str(),
      NULL
    };
    ExternalProgram prog( argv ,ExternalProgram::Discard_Stderr, false, -1, true );

    // :signature packet: algo 1, keyid 1397BC53640DB551
    //         version 4, created 1501094968, md5len 0, sigclass 0x00
    //         digest algo 8, begin of digest 15 89
    //         hashed subpkt 2 len 4 (sig created 2017-07-26)
    //         subpkt 16 len 8 (issuer key ID 1397BC53640DB551)
    //         data: [4095 bits]
    std::string id;
    for( std::string line = prog.receiveLine(); !line.empty(); line = prog.receiveLine() )
    {
      if ( id.empty() && str::startsWith( line, ":signature packet:" ) )
      {
        static const str::regex rxKeyId( " keyid +([0-9A-Z]+)" );
        str::smatch what;
        if( str::regex_match( line, what, rxKeyId ) )
          id = what[1];
      }
    }

    MIL << "Determined key id [" << id << "] for signature " << signature << endl;
    prog.close();
    return id;
  }

  bool KeyRing::Impl::verifyFile( const Pathname & file, const Pathname & signature, const Pathname & keyring )
  {
    const char* argv[] =
    {
      GPG_BINARY,
      "--verify",
      "--homedir", keyring.asString().c_str(),
      "--no-default-keyring",
      "--quiet",
      "--no-tty",
      "--batch",
      "--no-greeting",
      "--status-fd", "1",
      signature.asString().c_str(),
      file.asString().c_str(),
      NULL
    };

    // no need to parse output for now
    //     [GNUPG:] SIG_ID yCc4u223XRJnLnVAIllvYbUd8mQ 2006-03-29 1143618744
    //     [GNUPG:] GOODSIG A84EDAE89C800ACA SuSE Package Signing Key <build@suse.de>
    //     gpg: Good signature from "SuSE Package Signing Key <build@suse.de>"
    //     [GNUPG:] VALIDSIG 79C179B2E1C820C1890F9994A84EDAE89C800ACA 2006-03-29 1143618744 0 3 0 17 2 00 79C179B2E1C820C1890F9994A84EDAE89C800ACA
    //     [GNUPG:] TRUST_UNDEFINED

    //     [GNUPG:] ERRSIG A84EDAE89C800ACA 17 2 00 1143618744 9
    //     [GNUPG:] NO_PUBKEY A84EDAE89C800ACA

    ExternalProgram prog( argv,ExternalProgram::Discard_Stderr, false, -1, true );

    return ( prog.close() == 0 ) ? true : false;
  }


  //
  //    CLASS NAME : KeyRing
  //

  KeyRing::KeyRing( const Pathname & baseTmpDir )
  : _pimpl( new Impl( baseTmpDir ) )
  {}

  KeyRing::~KeyRing()
  {}


  void KeyRing::importKey( const PublicKey & key, bool trusted )
  { _pimpl->importKey( key, trusted ); }

  void KeyRing::multiKeyImport( const Pathname & keyfile_r, bool trusted_r )
  { _pimpl->multiKeyImport( keyfile_r, trusted_r ); }

  std::string KeyRing::readSignatureKeyId( const Pathname & signature )
  { return _pimpl->readSignatureKeyId( signature ); }

  void KeyRing::deleteKey( const std::string & id, bool trusted )
  { _pimpl->deleteKey( id, trusted ); }

  std::list<PublicKey> KeyRing::publicKeys()
  { return _pimpl->publicKeys(); }

  std:: list<PublicKey> KeyRing::trustedPublicKeys()
  { return _pimpl->trustedPublicKeys(); }

  std::list<PublicKeyData> KeyRing::publicKeyData()
  { return _pimpl->publicKeyData(); }

  std::list<PublicKeyData> KeyRing::trustedPublicKeyData()
  { return _pimpl->trustedPublicKeyData(); }

  bool KeyRing::verifyFileSignatureWorkflow( const Pathname & file, const std::string & filedesc, const Pathname & signature, bool & sigValid_r, const KeyContext & keycontext )
  { return _pimpl->verifyFileSignatureWorkflow( file, filedesc, signature, sigValid_r, keycontext ); }

  bool KeyRing::verifyFileSignatureWorkflow( const Pathname & file, const std::string filedesc, const Pathname & signature, const KeyContext & keycontext )
  { bool unused; return _pimpl->verifyFileSignatureWorkflow( file, filedesc, signature, unused, keycontext ); }

  bool KeyRing::verifyFileSignature( const Pathname & file, const Pathname & signature )
  { return _pimpl->verifyFileSignature( file, signature ); }

  bool KeyRing::verifyFileTrustedSignature( const Pathname & file, const Pathname & signature )
  { return _pimpl->verifyFileTrustedSignature( file, signature ); }

  void KeyRing::dumpPublicKey( const std::string & id, bool trusted, std::ostream & stream )
  { _pimpl->dumpPublicKey( id, trusted, stream ); }

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

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

  bool KeyRing::isKeyTrusted( const std::string & id )
  { return _pimpl->isKeyTrusted( id ); }

  bool KeyRing::isKeyKnown( const std::string & id )
  { return _pimpl->isKeyKnown( id ); }

} // namespace zypp