/* -*- c++ -*-
keyresolver.h
This file is part of libkleopatra, the KDE keymanagement library
Copyright (c) 2004 Klar�lvdalens Datakonsult AB
Based on kpgp.h
Copyright (C) 2001,2002 the KPGP authors
See file libtdenetwork/AUTHORS.kpgp for details
Libkleopatra is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
Libkleopatra is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
In addition, as a special exception, the copyright holders give
permission to link the code of this program with any edition of
the TQt library by Trolltech AS, Norway (or with modified versions
of TQt that use the same license as TQt), and distribute linked
combinations including the two. You must obey the GNU General
Public License in all respects for all of the code used other than
TQt. If you modify this file, you may extend this exception to
your version of the file, but you are not obligated to do so. If
you do not wish to do so, delete this exception statement from
your version.
*/
#ifndef __KLEO_KEYRESOLVER_H__
#define __KLEO_KEYRESOLVER_H__
#include <ui/keyapprovaldialog.h>
#include <kleo/enum.h>
#include <kpgp.h> // for Kpgp::Result
#include <gpgmepp/key.h>
#include <vector>
class TQStringList;
namespace Kleo {
/**
\short A class to resolve signing/encryption keys w.r.t. per-recipient preferences
\section Step 1: Set the information needed
The constructor takes some basic options as arguments, such as
whether or not encryption was actually requested. Recipient and
sender information is then set by using \c
setEncryptToSelfKeys(), \c setSigningKeys(), \c
setPrimaryRecipients() (To/Cc) and \c setSecondaryRecipients()
(Bcc).
\section Step 2: Lookup and check per-recipient crypto preferences / Opportunistic Encryption
First, \c checkSigningPreferences() goes through all recipient's
signing perferences, to determine whether or not to sign. It also
takes into account the available signing keys and whether or not
the user explicitly requested signing.
\c checkEncryptionPreferences() does the same for encryption
preferences. If opportunistic encryption is enabled, recipients
without encryption preferences set are treated as if they had a
preference of \c AskWheneverPossible.
In both cases an Action code is returned, with the following
meanings:
<dl><dt>Conflict</dt><dd>A conflict was detected. E.g. one
recipient's preference was set to "always encrypt", while another
one's preference was set to "never encrypt". You should ask the
user what to do.</dd></dt>
<dt>DoIt, DontDoIt</dt><dd>Do/Don't sign/encrypt</dd>
<dt>Ask</dt><dd>(Some) crypto preferences request to prompt the
user, so do it.</dd>
<dt>Impossible</dt><dd>Signing or encryption is impossible,
e.g. due to missing keys or unsupported formats.</dd> </dl>
\section Step 3: Resolve all keys.
In case signing or encryption was implicitly or explicitly
requested by the user, \c resolveAllKeys() tries to find signing
keys for each required format, as well as encryption keys for all
recipients (incl. the sender, if encrypt-to-self is set).
\section Step 4: Get signing keys.
If, after key resolving, signing is still requested and
apparently possible, you can get the result of all this by
iterating over the available message formats and retrieving the
set of signing keys to use with a call to \c signingKeys().
\section Step 5: Get encrytion key sets.
If after key resolving, encryption is still requested and
apparently possible, you can get the result of all this by
calling \c encryptionItems() with the current message format at
hand as its argument.
This will return a list of recipient-list/key-list pairs that
each describe a copy of the (possibly signed) message to be
encrypted independantly.
Note that it's only necessary to sign the message once for each
message format, although it might be necessary to create more
than one message when encrypting. This is because encryption
allows the recipients to learn about the other recipients the
message was encrypted to, so each secondary (BCC) recipient need
a copy of it's own to hide the other secondary recipients.
*/
class KeyResolver {
public:
KeyResolver( bool encToSelf, bool showApproval, bool oppEncryption,
unsigned int format,
int encrKeyNearExpiryThresholdDays,
int signKeyNearExpiryThresholdDays,
int encrRootCertNearExpiryThresholdDays,
int signRootCertNearExpiryThresholdDays,
int encrChainCertNearExpiryThresholdDays,
int signChainCertNearExpiryThresholdDays );
~KeyResolver();
struct Item : public KeyApprovalDialog::Item {
Item()
: KeyApprovalDialog::Item(),
signPref( UnknownSigningPreference ),
format( AutoFormat ),
needKeys( true ) {}
Item( const TQString & a,
EncryptionPreference e, SigningPreference s,
CryptoMessageFormat f )
: KeyApprovalDialog::Item( a, std::vector<GpgME::Key>(), e ),
signPref( s ), format( f ), needKeys( true ) {}
Item( const TQString & a, const std::vector<GpgME::Key> & k,
EncryptionPreference e, SigningPreference s,
CryptoMessageFormat f )
: KeyApprovalDialog::Item( a, k, e ),
signPref( s ), format( f ), needKeys( false ) {}
SigningPreference signPref;
CryptoMessageFormat format;
bool needKeys;
};
/**
Set the fingerprints of keys to be used for encrypting to
self. Also looks them up and complains if they're not usable or
found.
*/
Kpgp::Result setEncryptToSelfKeys( const TQStringList & fingerprints );
/**
Set the fingerprints of keys to be used for signing. Also
looks them up and complains if they're not usable or found.
*/
Kpgp::Result setSigningKeys( const TQStringList & fingerprints );
/**
Set the list of primary (To/CC) recipient addresses. Also looks
up possible keys, but doesn't interact with the user.
*/
void setPrimaryRecipients( const TQStringList & addresses );
/**
Set the list of secondary (BCC) recipient addresses. Also looks
up possible keys, but doesn't interact with the user.
*/
void setSecondaryRecipients( const TQStringList & addresses );
/**
Determine whether to sign or not, depending on the
per-recipient signing preferences, as well as the availability
of usable signing keys.
*/
Action checkSigningPreferences( bool signingRequested ) const;
/**
Determine whether to encrypt or not, depending on the
per-recipient encryption preferences, as well as the availability
of usable encryption keys.
*/
Action checkEncryptionPreferences( bool encryptionRequested ) const;
/**
Queries the user for missing keys and displays a key approval
dialog if needed.
*/
Kpgp::Result resolveAllKeys( bool& signingRequested, bool& encryptionRequested );
/**
@return the signing keys to use (if any) for the given message
format.
*/
std::vector<GpgME::Key> signingKeys( CryptoMessageFormat f ) const;
struct SplitInfo {
SplitInfo() {}
SplitInfo( const TQStringList & r ) : recipients( r ) {}
SplitInfo( const TQStringList & r, const std::vector<GpgME::Key> & k )
: recipients( r ), keys( k ) {}
TQStringList recipients;
std::vector<GpgME::Key> keys;
};
/** @return the found distinct sets of items for format \a f. The
returned vector will contain more than one item only if
secondary recipients have been specified.
*/
std::vector<SplitInfo> encryptionItems( CryptoMessageFormat f ) const;
private:
void dump() const;
std::vector<Item> getEncryptionItems( const TQStringList & recipients );
std::vector<GpgME::Key> getEncryptionKeys( const TQString & recipient, bool quiet ) const;
Kpgp::Result showKeyApprovalDialog();
bool encryptionPossible() const;
bool signingPossible() const;
Kpgp::Result resolveEncryptionKeys( bool signingRequested );
Kpgp::Result resolveSigningKeysForEncryption();
Kpgp::Result resolveSigningKeysForSigningOnly();
Kpgp::Result checkKeyNearExpiry( const GpgME::Key & key,
const char * dontAskAgainName, bool mine,
bool sign, bool ca=false, int recurse_limit=100,
const GpgME::Key & orig_key=GpgME::Key::null ) const;
void collapseAllSplitInfos();
void addToAllSplitInfos( const std::vector<GpgME::Key> & keys, unsigned int formats );
void addKeys( const std::vector<Item> & items, CryptoMessageFormat f );
void addKeys( const std::vector<Item> & items );
TQStringList allRecipients() const;
std::vector<GpgME::Key> signingKeysFor( CryptoMessageFormat f ) const;
std::vector<GpgME::Key> encryptToSelfKeysFor( CryptoMessageFormat f ) const;
std::vector<GpgME::Key> lookup( const TQStringList & patterns, bool secret=false ) const;
bool haveTrustedEncryptionKey( const TQString & person ) const;
std::vector<GpgME::Key> selectKeys( const TQString & person, const TQString & msg,
const std::vector<GpgME::Key> & selectedKeys=std::vector<GpgME::Key>() ) const;
TQStringList keysForAddress( const TQString & address ) const;
void setKeysForAddress( const TQString & address, const TQStringList& pgpKeyFingerprints, const TQStringList& smimeCertFingerprints ) const;
bool encryptToSelf() const { return mEncryptToSelf; }
bool showApprovalDialog() const { return mShowApprovalDialog; }
int encryptKeyNearExpiryWarningThresholdInDays() const {
return mEncryptKeyNearExpiryWarningThreshold;
}
int signingKeyNearExpiryWarningThresholdInDays() const {
return mSigningKeyNearExpiryWarningThreshold;
}
int encryptRootCertNearExpiryWarningThresholdInDays() const {
return mEncryptRootCertNearExpiryWarningThreshold;
}
int signingRootCertNearExpiryWarningThresholdInDays() const {
return mSigningRootCertNearExpiryWarningThreshold;
}
int encryptChainCertNearExpiryWarningThresholdInDays() const {
return mEncryptChainCertNearExpiryWarningThreshold;
}
int signingChainCertNearExpiryWarningThresholdInDays() const {
return mSigningChainCertNearExpiryWarningThreshold;
}
struct ContactPreferences {
ContactPreferences();
Kleo::EncryptionPreference encryptionPreference;
Kleo::SigningPreference signingPreference;
Kleo::CryptoMessageFormat cryptoMessageFormat;
TQStringList pgpKeyFingerprints;
TQStringList smimeCertFingerprints;
};
ContactPreferences lookupContactPreferences( const TQString& address ) const;
void saveContactPreference( const TQString& email, const ContactPreferences& pref ) const;
private:
class EncryptionPreferenceCounter;
friend class ::Kleo::KeyResolver::EncryptionPreferenceCounter;
class SigningPreferenceCounter;
friend class ::Kleo::KeyResolver::SigningPreferenceCounter;
class Private;
Private * d;
bool mEncryptToSelf;
const bool mShowApprovalDialog : 1;
const bool mOpportunisticEncyption : 1;
const unsigned int mCryptoMessageFormats;
const int mEncryptKeyNearExpiryWarningThreshold;
const int mSigningKeyNearExpiryWarningThreshold;
const int mEncryptRootCertNearExpiryWarningThreshold;
const int mSigningRootCertNearExpiryWarningThreshold;
const int mEncryptChainCertNearExpiryWarningThreshold;
const int mSigningChainCertNearExpiryWarningThreshold;
};
} // namespace Kleo
#endif // __KLEO_KEYRESOLVER_H__