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gpgme/gpgmeplug/gpgmeplug.c

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/* -*- Mode: C -*-
$Id$
GPGMEPLUG - an GPGME based cryptography plug-in following
the common CRYPTPLUG specification.
Copyright (C) 2001 by Klarälvdalens Datakonsult AB
GPGMEPLUG is free software; you can redistribute it and/or modify
it under the terms of GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
GPGMEPLUG is distributed in the hope that it will be useful,
it under the terms of GNU General Public License as published by
the Free Software Foundation; version 2 of the License
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/*! \file gpgmeplug.c
\brief GPGME implementation of CRYPTPLUG following the
specification located in common API header cryptplug.h.
CRYPTPLUG is an independent cryptography plug-in API
developed for Sphinx-enabeling KMail and Mutt.
CRYPTPLUG was designed for the Aegypten project, but it may
be used by 3rd party developers as well to design pluggable
crypto backends for the above mentioned MUAs.
\note All string parameters appearing in this API are to be
interpreted as UTF-8 encoded.
\see cryptplug.h
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
#ifndef BUG_URL
#define BUG_URL "http:://www.gnupg.org/aegypten/"
#endif
#include "gpgme.h"
#ifndef GPGMEPLUG_PROTOCOL
#define GPGMEPLUG_PROTOCOL GPGME_PROTOCOL_OpenPGP
#endif
// definitions for signing
#ifndef GPGMEPLUG_SIGN_MAKE_MIME_OBJECT
#define GPGMEPLUG_SIGN_INCLUDE_CLEARTEXT true
#define GPGMEPLUG_SIGN_MAKE_MIME_OBJECT true
#define GPGMEPLUG_SIGN_MAKE_MULTI_MIME true
#define GPGMEPLUG_SIGN_CTYPE_MAIN "multipart/signed;protocol=application/pgp-signature;micalg=pgp-sha1"
#define GPGMEPLUG_SIGN_CDISP_MAIN ""
#define GPGMEPLUG_SIGN_CTENC_MAIN ""
#define GPGMEPLUG_SIGN_CTYPE_VERSION ""
#define GPGMEPLUG_SIGN_CDISP_VERSION ""
#define GPGMEPLUG_SIGN_CTENC_VERSION ""
#define GPGMEPLUG_SIGN_BTEXT_VERSION ""
#define GPGMEPLUG_SIGN_CTYPE_CODE "application/pgp-signature"
#define GPGMEPLUG_SIGN_CDISP_CODE ""
#define GPGMEPLUG_SIGN_CTENC_CODE ""
#define GPGMEPLUG_SIGN_FLAT_PREFIX ""
#define GPGMEPLUG_SIGN_FLAT_SEPARATOR ""
#define GPGMEPLUG_SIGN_FLAT_POSTFIX ""
#endif
// definitions for encoding
#ifndef GPGMEPLUG_ENC_MAKE_MIME_OBJECT
#define GPGMEPLUG_ENC_INCLUDE_CLEARTEXT false
#define GPGMEPLUG_ENC_MAKE_MIME_OBJECT true
#define GPGMEPLUG_ENC_MAKE_MULTI_MIME true
#define GPGMEPLUG_ENC_CTYPE_MAIN "multipart/encrypted; protocol=application/pgp-encrypted"
#define GPGMEPLUG_ENC_CDISP_MAIN ""
#define GPGMEPLUG_ENC_CTENC_MAIN ""
#define GPGMEPLUG_ENC_CTYPE_VERSION "application/pgp-encrypted"
#define GPGMEPLUG_ENC_CDISP_VERSION "attachment"
#define GPGMEPLUG_ENC_CTENC_VERSION ""
#define GPGMEPLUG_ENC_BTEXT_VERSION "Version: 1"
#define GPGMEPLUG_ENC_CTYPE_CODE "application/octet-stream"
#define GPGMEPLUG_ENC_CDISP_CODE "inline; filename=\"msg.asc\""
#define GPGMEPLUG_ENC_CTENC_CODE ""
#define GPGMEPLUG_ENC_FLAT_PREFIX ""
#define GPGMEPLUG_ENC_FLAT_SEPARATOR ""
#define GPGMEPLUG_ENC_FLAT_POSTFIX ""
#endif
// Note: The following specification will result in
// function encryptAndSignMessage() producing
// _empty_ mails.
// This must be changed as soon as our plugin
// is supporting the encryptAndSignMessage() function.
#ifndef GPGMEPLUG_ENCSIGN_MAKE_MIME_OBJECT
#define GPGMEPLUG_ENCSIGN_INCLUDE_CLEARTEXT false
#define GPGMEPLUG_ENCSIGN_MAKE_MIME_OBJECT false
#define GPGMEPLUG_ENCSIGN_MAKE_MULTI_MIME false
#define GPGMEPLUG_ENCSIGN_CTYPE_MAIN ""
#define GPGMEPLUG_ENCSIGN_CDISP_MAIN ""
#define GPGMEPLUG_ENCSIGN_CTENC_MAIN ""
#define GPGMEPLUG_ENCSIGN_CTYPE_VERSION ""
#define GPGMEPLUG_ENCSIGN_CDISP_VERSION ""
#define GPGMEPLUG_ENCSIGN_CTENC_VERSION ""
#define GPGMEPLUG_ENCSIGN_BTEXT_VERSION ""
#define GPGMEPLUG_ENCSIGN_CTYPE_CODE ""
#define GPGMEPLUG_ENCSIGN_CDISP_CODE ""
#define GPGMEPLUG_ENCSIGN_CTENC_CODE ""
#define GPGMEPLUG_ENCSIGN_FLAT_PREFIX ""
#define GPGMEPLUG_ENCSIGN_FLAT_SEPARATOR ""
#define GPGMEPLUG_ENCSIGN_FLAT_POSTFIX ""
#endif
#include "cryptplug.h"
typedef struct {
const char* bugURL;
const char* signatureKeyCertificate;
SignatureAlgorithm signatureAlgorithm;
SendCertificates sendCertificates;
SignEmail signEmail;
bool saveSentSignatures;
bool warnNoCertificate;
PinRequests numPINRequests;
bool checkSignatureCertificatePathToRoot;
bool signatureUseCRLs;
EncryptionAlgorithm encryptionAlgorithm;
EncryptEmail encryptEmail;
bool saveMessagesEncrypted;
bool checkEncryptionCertificatePathToRoot;
bool encryptionUseCRLs;
bool encryptionCRLExpiryNearWarning;
int encryptionCRLNearExpiryInterval;
struct DirectoryServer *directoryServers;
unsigned int numDirectoryServers;
CertificateSource certificateSource;
CertificateSource cRLSource;
bool warnSendUnsigned;
int numPINRequestsInterval;
bool signatureCertificateExpiryNearWarning;
int signatureCertificateExpiryNearInterval;
bool cACertificateExpiryNearWarning;
int cACertificateExpiryNearInterval;
bool rootCertificateExpiryNearWarning;
int rootCertificateExpiryNearInterval;
bool warnSendUnencrypted;
bool checkCertificatePath;
bool receiverCertificateExpiryNearWarning;
int receiverCertificateExpiryNearWarningInterval;
bool certificateInChainExpiryNearWarning;
int certificateInChainExpiryNearWarningInterval;
bool receiverEmailAddressNotInCertificateWarning;
} Config;
Config config;
#define NEAR_EXPIRY 14
bool initialize()
{
config.bugURL = malloc( strlen( BUG_URL ) + 1 );
strcpy( (char* )config.bugURL, BUG_URL );
config.signatureKeyCertificate = malloc( 1 );
strcpy( (char* )config.signatureKeyCertificate, "" );
config.signatureAlgorithm = SignAlg_SHA1;
config.sendCertificates = SendCert_SendChainWithRoot;
config.signEmail = SignEmail_SignAll;
config.saveSentSignatures = true;
config.warnNoCertificate = true;
config.numPINRequests = PinRequest_Always;
config.checkSignatureCertificatePathToRoot = true;
config.signatureUseCRLs = true;
config.encryptionAlgorithm = EncryptAlg_RSA;
config.encryptEmail = EncryptEmail_Ask;
config.saveMessagesEncrypted = true;
config.checkEncryptionCertificatePathToRoot = true;
config.encryptionUseCRLs = true;
config.encryptionCRLExpiryNearWarning = true;
config.encryptionCRLNearExpiryInterval = NEAR_EXPIRY;
config.directoryServers = NULL;
config.numDirectoryServers = 0;
config.certificateSource = CertSrc_Server;
config.cRLSource = CertSrc_Server;
config.warnSendUnsigned = true;
config.numPINRequestsInterval = NEAR_EXPIRY;
config.signatureCertificateExpiryNearWarning = true;
config.signatureCertificateExpiryNearInterval = NEAR_EXPIRY;
config.cACertificateExpiryNearWarning = true;
config.cACertificateExpiryNearInterval = NEAR_EXPIRY;
config.rootCertificateExpiryNearWarning = true;
config.rootCertificateExpiryNearInterval = NEAR_EXPIRY;
config.warnSendUnencrypted = false;
config.checkCertificatePath = true;
config.receiverCertificateExpiryNearWarning = true;
config.receiverCertificateExpiryNearWarningInterval = NEAR_EXPIRY;
config.certificateInChainExpiryNearWarning = true;
config.certificateInChainExpiryNearWarningInterval = NEAR_EXPIRY;
config.receiverEmailAddressNotInCertificateWarning = true;
return true;
};
void deinitialize()
{
unsigned int i;
for( i = 0; i < config.numDirectoryServers; ++i ) {
free( (char *)config.directoryServers[i].servername );
free( (char *)config.directoryServers[i].description );
}
free( config.directoryServers );
}
bool hasFeature( Feature flag )
{
switch ( flag ) {
case CryptPlugFeat_SignMessages: return true;
case CryptPlugFeat_VerifySignatures: return true;
case CryptPlugFeat_EncryptMessages: return true;
case CryptPlugFeat_DecryptMessages: return true;
// undefined or not yet implemented:
case CryptPlugFeat_undef: return false;
default: return false;
}
}
const char* bugURL(){ return config.bugURL; }
void unsafeStationery( void** pixmap, const char** menutext, char* accel,
const char** tooltip, const char** statusbartext ){}
void signedStationery( void** pixmap, const char** menutext, char* accel,
const char** tooltip, const char** statusbartext ){}
void encryptedStationery( void** pixmap, const char**
menutext, char* accel,
const char** tooltip, const char** statusbartext ){}
void signedEncryptedStationery( void** pixmap, const char**
menutext, char* accel,
const char** tooltip, const char** statusbartext ){}
const char* signatureConfigurationDialog(){ return 0; }
const char* signatureKeySelectionDialog(){ return 0; }
const char* signatureAlgorithmDialog(){ return 0; }
const char* signatureHandlingDialog(){ return 0; }
void setSignatureKeyCertificate( const char* certificate )
{
config.signatureKeyCertificate = certificate;
}
const char* signatureKeyCertificate()
{
return config.signatureKeyCertificate;
}
void setSignatureAlgorithm( SignatureAlgorithm sigAlg )
{
config.signatureAlgorithm = sigAlg;
}
SignatureAlgorithm signatureAlgorithm()
{
return config.signatureAlgorithm;
}
void setSendCertificates( SendCertificates sendCert )
{
config.sendCertificates = sendCert;
}
SendCertificates sendCertificates()
{
return config.sendCertificates;
}
void setSignEmail( SignEmail signMail )
{
config.signEmail = signMail;
}
SignEmail signEmail()
{
return config.signEmail;
}
void setWarnSendUnsigned( bool flag )
{
config.warnSendUnsigned = flag;
}
bool warnSendUnsigned()
{
return config.warnSendUnsigned;
}
void setSaveSentSignatures( bool flag )
{
config.saveSentSignatures = flag;
}
bool saveSentSignatures()
{
return config.saveSentSignatures;
}
void setWarnNoCertificate( bool flag )
{
config.warnNoCertificate = flag;
}
bool warnNoCertificate()
{
return config.warnNoCertificate;
}
bool isEmailInCertificate( const char* email, const char* certificate )
{
/* PENDING(g10) this function should return true if the email
address passed as the first parameter is contained in the
certificate passed as the second parameter, and false
otherwise. This is used to alert the user if his own email
address is not contained in the certificate he uses for
signing.
Note that the parameter email can be anything that is allowed
in a From: line.
Another note: OK, OK, we'll handle that in the MUA. You can
assume that you only get the email address.
*/
return false; // dummy
}
void setNumPINRequests( PinRequests reqMode )
{
config.numPINRequests = reqMode;
/* PENDING(g10) Put this value into gpg and make it ask for the pin
according to this. Note that there is also
setNumPINRequestsInterval() which is only used if reqMode ==
PinRequest_AfterMinutes.
*/
}
PinRequests numPINRequests()
{
return config.numPINRequests;
}
void setNumPINRequestsInterval( int interval )
{
config.numPINRequestsInterval = interval;
/* PENDING(g10) Put this value into gpg and make it ask for the pin
according to this. Note that this should only be used if
config.numPINRequests (set with setNumPINRequests()) has the
value PinRequest_AfterMinutes.
*/
}
int numPINRequestsInterval()
{
return config.numPINRequestsInterval;
}
void setCheckSignatureCertificatePathToRoot( bool flag )
{
config.checkSignatureCertificatePathToRoot = flag;
}
bool checkSignatureCertificatePathToRoot()
{
return config.checkSignatureCertificatePathToRoot;
}
void setSignatureUseCRLs( bool flag )
{
config.signatureUseCRLs = flag;
}
bool signatureUseCRLs()
{
return config.signatureUseCRLs;
}
void setSignatureCertificateExpiryNearWarning( bool flag )
{
config.signatureCertificateExpiryNearWarning = flag;
}
bool signatureCertificateExpiryNearWarning( void )
{
return config.signatureCertificateExpiryNearWarning;
}
int signatureCertificateDaysLeftToExpiry( const char* certificate )
{
/* PENDING(g10)
Please return the number of days that are left until the
certificate specified in the parameter certificate expires.
*/
return 10; // dummy that triggers a warning in the MUA
}
void setSignatureCertificateExpiryNearInterval( int interval )
{
config.signatureCertificateExpiryNearInterval = interval;
}
int signatureCertificateExpiryNearInterval( void )
{
return config.signatureCertificateExpiryNearInterval;
}
void setCACertificateExpiryNearWarning( bool flag )
{
config.cACertificateExpiryNearWarning = flag;
}
bool caCertificateExpiryNearWarning( void )
{
return config.cACertificateExpiryNearWarning;
}
int caCertificateDaysLeftToExpiry( const char* certificate )
{
/* PENDING(g10)
Please return the number of days that are left until the
CA certificate for the certificate specified in the parameter
certificate expires.
*/
return 10; // dummy that triggers a warning in the MUA
}
void setCACertificateExpiryNearInterval( int interval )
{
config.cACertificateExpiryNearInterval = interval;
}
int caCertificateExpiryNearInterval( void )
{
return config.cACertificateExpiryNearInterval;
}
void setRootCertificateExpiryNearWarning( bool flag )
{
config.rootCertificateExpiryNearWarning = flag;
}
bool rootCertificateExpiryNearWarning( void )
{
return config.rootCertificateExpiryNearWarning;
}
int rootCertificateDaysLeftToExpiry( const char* certificate )
{
/* PENDING(g10)
Please return the number of days that are left until the
root certificate for the certificate specified in the parameter
certificate expires.
*/
return 10; // dummy that triggers a warning in the MUA
}
void setRootCertificateExpiryNearInterval( int interval )
{
config.rootCertificateExpiryNearInterval = interval;
}
int rootCertificateExpiryNearInterval( void )
{
return config.rootCertificateExpiryNearInterval;
}
const char* encryptionConfigurationDialog(){ return 0; }
const char* encryptionAlgorithmDialog(){ return 0; }
const char* encryptionHandlingDialog(){ return 0; }
const char* encryptionReceiverDialog(){ return 0; }
void setEncryptionAlgorithm( EncryptionAlgorithm cryptAlg )
{
config.encryptionAlgorithm = cryptAlg;
}
EncryptionAlgorithm encryptionAlgorithm()
{
return config.encryptionAlgorithm;
}
void setEncryptEmail( EncryptEmail cryptMode )
{
config.encryptEmail = cryptMode;
}
EncryptEmail encryptEmail()
{
return config.encryptEmail;
}
void setWarnSendUnencrypted( bool flag )
{
config.warnSendUnencrypted = flag;
}
bool warnSendUnencrypted()
{
return config.warnSendUnencrypted;
}
void setSaveMessagesEncrypted( bool flag )
{
config.saveMessagesEncrypted = flag;
}
bool saveMessagesEncrypted()
{
return config.saveMessagesEncrypted;
}
void setCheckCertificatePath( bool flag )
{
config.checkCertificatePath = flag;
}
bool checkCertificatePath()
{
return config.checkCertificatePath;
}
void setCheckEncryptionCertificatePathToRoot( bool flag )
{
config.checkEncryptionCertificatePathToRoot = flag;
}
bool checkEncryptionCertificatePathToRoot()
{
return config.checkEncryptionCertificatePathToRoot;
}
void setReceiverCertificateExpiryNearWarning( bool flag )
{
config.receiverCertificateExpiryNearWarning = flag;
}
bool receiverCertificateExpiryNearWarning()
{
return config.receiverCertificateExpiryNearWarning;
}
int receiverCertificateDaysLeftToExpiry( const char* certificate )
{
/* PENDING(g10)
Please return the number of days that are left until the
certificate specified in the parameter certificate expires.
*/
return 10; // dummy that triggers a warning in the MUA
}
void setReceiverCertificateExpiryNearWarningInterval( int interval )
{
config.receiverCertificateExpiryNearWarningInterval = interval;
}
int receiverCertificateExpiryNearWarningInterval()
{
return config.receiverCertificateExpiryNearWarningInterval;
}
void setCertificateInChainExpiryNearWarning( bool flag )
{
config.certificateInChainExpiryNearWarning = flag;
}
bool certificateInChainExpiryNearWarning()
{
return config.certificateInChainExpiryNearWarning;
}
int certificateInChainDaysLeftToExpiry( const char* certificate )
{
/* PENDING(g10)
Please return the number of days that are left until the
the first certificate in the chain of the specified certificate
expires.
*/
return 10; // dummy that triggers a warning in the MUA
}
void setCertificateInChainExpiryNearWarningInterval( int interval )
{
config.certificateInChainExpiryNearWarningInterval = interval;
}
int certificateInChainExpiryNearWarningInterval()
{
return config.certificateInChainExpiryNearWarningInterval;
}
void setReceiverEmailAddressNotInCertificateWarning( bool flag )
{
config.receiverEmailAddressNotInCertificateWarning = flag;
}
bool receiverEmailAddressNotInCertificateWarning()
{
return config.receiverEmailAddressNotInCertificateWarning;
}
void setEncryptionUseCRLs( bool flag )
{
config.encryptionUseCRLs = flag;
/* PENDING(g10) Store this setting in gpgme and use it. If true,
every certificate used for encryption should be checked against
applicable CRLs.
*/
}
bool encryptionUseCRLs()
{
return config.encryptionUseCRLs;
}
int encryptionCRLsDaysLeftToExpiry()
{
/* PENDING(g10)
Please return the number of days that are left until the
CRL used for encryption expires.
*/
return 10; // dummy that triggers a warning in the MUA
}
void setEncryptionCRLExpiryNearWarning( bool flag )
{
config.encryptionCRLExpiryNearWarning = flag;
}
bool encryptionCRLExpiryNearWarning()
{
return config.encryptionCRLExpiryNearWarning;
}
void setEncryptionCRLNearExpiryInterval( int interval )
{
config.encryptionCRLNearExpiryInterval = interval;
}
int encryptionCRLNearExpiryInterval()
{
return config.encryptionCRLNearExpiryInterval;
}
const char* directoryServiceConfigurationDialog(){ return 0; }
void appendDirectoryServer( const char* servername,
int port,
const char* description )
{
struct DirectoryServer *newServers = NULL;
newServers = realloc( config.directoryServers,
(1+config.numDirectoryServers) * sizeof *newServers );
if( newServers ) {
config.directoryServers = newServers;
newServers[ config.numDirectoryServers ].servername =
malloc( 1+strlen( servername ) );
if( newServers[ config.numDirectoryServers ].servername ) {
strcpy( (char *)newServers[ config.numDirectoryServers ].servername,
servername );
newServers[ config.numDirectoryServers ].description =
malloc( 1+strlen( description ) );
if( newServers[ config.numDirectoryServers ].description ) {
strcpy( (char *)newServers[ config.numDirectoryServers ].description,
description );
newServers[ config.numDirectoryServers ].port = port;
config.numDirectoryServers += 1;
}
}
}
}
void setDirectoryServers( struct DirectoryServer server[], unsigned int size )
{
unsigned int i;
int oldSize = config.numDirectoryServers;
struct DirectoryServer *newServers = NULL;
newServers = calloc ( size, sizeof *newServers );
if( newServers ) {
for( i=0; i < oldSize; ++i ) {
free( (char *)config.directoryServers[i].servername );
free( (char *)config.directoryServers[i].description );
}
free( config.directoryServers );
for( i=0; i < size; ++i ) {
newServers[ i ].servername = malloc( 1+strlen( server[i].servername ) );
if( newServers[ i ].servername ) {
strcpy( (char *)newServers[ i ].servername, server[i].servername );
newServers[ i ].description = malloc( 1+strlen( server[i].description ) );
if( newServers[ i ].description ) {
strcpy( (char *)newServers[ i ].description, server[i].description );
newServers[ i ].port = server[i].port;
}
}
}
config.directoryServers = newServers;
config.numDirectoryServers = size;
}
}
struct DirectoryServer * directoryServers( int* numServers )
{
if( numServers )
*numServers = config.numDirectoryServers;
return config.directoryServers;
};
void setCertificateSource( CertificateSource source )
{
config.certificateSource = source;
}
CertificateSource certificateSource()
{
return config.certificateSource;
}
void setCRLSource( CertificateSource source )
{
config.cRLSource = source;
}
CertificateSource crlSource()
{
return config.cRLSource;
}
bool certificateValidity( const char* certificate,
int* level ){ return true; }
void storeNewCharPtr( char** dest, const char* src )
{
int sLen = strlen( src );
*dest = malloc( sLen + 1 );
strcpy( *dest, src );
(*dest)[sLen] = '\0';
}
bool signMessage( const char* cleartext,
const char** ciphertext,
const char* certificate,
struct StructuringInfo* structuring )
{
GpgmeCtx ctx;
GpgmeError err;
GpgmeData data, sig;
size_t rSLen = 0;
char* rSig = 0;
bool bOk = false;
int sendCerts = 1;
init_StructuringInfo( structuring );
if( !ciphertext )
return false;
err = gpgme_new (&ctx);
gpgme_set_protocol (ctx, GPGMEPLUG_PROTOCOL);
gpgme_set_armor (ctx, 1);
gpgme_set_textmode (ctx, 1);
switch ( config.sendCertificates ) {
case SendCert_undef:
break;
case SendCert_DontSend:
sendCerts = 0;
break;
case SendCert_SendOwn:
sendCerts = 1;
break;
case SendCert_SendChainWithoutRoot:
sendCerts = -2;
break;
case SendCert_SendChainWithRoot:
sendCerts = -1;
break;
default:
sendCerts = 0;
break;
}
gpgme_set_include_certs (ctx, sendCerts);
// PENDING(g10) Implement this
//gpgme_set_signature_algorithm( ctx, config.signatureAlgorithm );
gpgme_data_new_from_mem (&data, cleartext,
strlen( cleartext ), 1 );
gpgme_data_new ( &sig );
err = gpgme_op_sign (ctx, data, sig, GPGME_SIG_MODE_DETACH );
if (!err) {
rSig = gpgme_data_release_and_get_mem( sig, &rSLen );
*ciphertext = malloc( rSLen + 1 );
if( *ciphertext ) {
if( rSLen ) {
bOk = true;
strncpy((char*)*ciphertext, rSig, rSLen );
}
((char*)(*ciphertext))[rSLen] = '\0';
}
free( rSig );
}
else {
gpgme_data_release( sig );
*ciphertext = 0;
// hier fehlt eine Fehlerbehandlung, falls das
// Signieren schiefging
}
gpgme_data_release( data );
gpgme_release (ctx);
if( bOk && structuring ) {
structuring->includeCleartext = GPGMEPLUG_SIGN_INCLUDE_CLEARTEXT;
structuring->makeMimeObject = GPGMEPLUG_SIGN_MAKE_MIME_OBJECT;
if( structuring->makeMimeObject ) {
structuring->makeMultiMime = GPGMEPLUG_SIGN_MAKE_MULTI_MIME;
storeNewCharPtr( &structuring->contentTypeMain,
GPGMEPLUG_SIGN_CTYPE_MAIN );
storeNewCharPtr( &structuring->contentDispMain,
GPGMEPLUG_SIGN_CDISP_MAIN );
storeNewCharPtr( &structuring->contentTEncMain,
GPGMEPLUG_SIGN_CTENC_MAIN );
if( structuring->makeMultiMime ) {
storeNewCharPtr( &structuring->contentTypeVersion,
GPGMEPLUG_SIGN_CTYPE_VERSION );
storeNewCharPtr( &structuring->contentDispVersion,
GPGMEPLUG_SIGN_CDISP_VERSION );
storeNewCharPtr( &structuring->contentTEncVersion,
GPGMEPLUG_SIGN_CTENC_VERSION );
storeNewCharPtr( &structuring->bodyTextVersion,
GPGMEPLUG_SIGN_BTEXT_VERSION );
storeNewCharPtr( &structuring->contentTypeCode,
GPGMEPLUG_SIGN_CTYPE_CODE );
storeNewCharPtr( &structuring->contentDispCode,
GPGMEPLUG_SIGN_CDISP_CODE );
storeNewCharPtr( &structuring->contentTEncCode,
GPGMEPLUG_SIGN_CTENC_CODE );
}
} else {
storeNewCharPtr( &structuring->flatTextPrefix,
GPGMEPLUG_SIGN_FLAT_PREFIX );
storeNewCharPtr( &structuring->flatTextSeparator,
GPGMEPLUG_SIGN_FLAT_SEPARATOR );
storeNewCharPtr( &structuring->flatTextPostfix,
GPGMEPLUG_SIGN_FLAT_POSTFIX );
}
}
return bOk;
}
static const char*
sig_status_to_string( GpgmeSigStat status )
{
const char *result;
switch (status) {
case GPGME_SIG_STAT_NONE:
result = "Oops: Signature not verified";
break;
case GPGME_SIG_STAT_NOSIG:
result = "No signature found";
break;
case GPGME_SIG_STAT_GOOD:
result = "Good signature";
break;
case GPGME_SIG_STAT_BAD:
result = "BAD signature";
break;
case GPGME_SIG_STAT_NOKEY:
result = "No public key to verify the signature";
break;
case GPGME_SIG_STAT_ERROR:
result = "Error verifying the signature";
break;
case GPGME_SIG_STAT_DIFF:
result = "Different results for signatures";
break;
default:
result = "Error: Unknown status";
break;
}
return result;
}
bool checkMessageSignature( const char* ciphertext,
const char* signaturetext,
bool signatureIsBinary,
int signatureLen,
struct SignatureMetaData* sigmeta )
{
GpgmeCtx ctx;
GpgmeSigStat status;
GpgmeData datapart, sigpart;
GpgmeError err;
GpgmeKey key;
time_t created;
int sig_idx = 0;
const char* statusStr;
const char* fpr;
gpgme_new( &ctx );
gpgme_set_protocol (ctx, GPGMEPLUG_PROTOCOL);
gpgme_set_armor (ctx, signatureIsBinary ? 0 : 1);
// gpgme_set_textmode (ctx, signatureIsBinary ? 0 : 1);
gpgme_data_new_from_mem( &datapart, ciphertext,
strlen( ciphertext ), 1 );
gpgme_data_new_from_mem( &sigpart,
signaturetext,
signatureIsBinary
? signatureLen
: strlen( signaturetext ),
1 );
gpgme_op_verify( ctx, sigpart, datapart, &status );
gpgme_data_release( datapart );
gpgme_data_release( sigpart );
/* Provide information in the sigmeta struct */
/* the status string */
statusStr = sig_status_to_string( status );
sigmeta->status = malloc( strlen( statusStr ) + 1 );
if( sigmeta->status ) {
strcpy( sigmeta->status, statusStr );
sigmeta->status[strlen( statusStr )] = '\0';
} else
; // nothing to do, is already 0
// Extended information for any number of signatures.
fpr = gpgme_get_sig_status( ctx, sig_idx, &status, &created );
sigmeta->extended_info = 0;
while( fpr != NULL ) {
struct tm* ctime_val;
const char* sig_status;
void* realloc_return = realloc( sigmeta->extended_info,
sizeof( struct SignatureMetaDataExtendedInfo ) * ( sig_idx + 1 ) );
if( realloc_return ) {
sigmeta->extended_info = realloc_return;
// the creation time
sigmeta->extended_info[sig_idx].creation_time = malloc( sizeof( struct tm ) );
if( sigmeta->extended_info[sig_idx].creation_time ) {
ctime_val = localtime( &created );
memcpy( sigmeta->extended_info[sig_idx].creation_time,
ctime_val, sizeof( struct tm ) );
}
err = gpgme_get_sig_key (ctx, sig_idx, &key);
sig_status = sig_status_to_string( status );
sigmeta->extended_info[sig_idx].status_text = malloc( strlen( sig_status ) + 1 );
if( sigmeta->extended_info[sig_idx].status_text ) {
strcpy( sigmeta->extended_info[sig_idx].status_text,
sig_status );
sigmeta->extended_info[sig_idx].status_text[strlen( sig_status )] = '\0';
}
sigmeta->extended_info[sig_idx].fingerprint = malloc( strlen( fpr ) + 1 );
if( sigmeta->extended_info[sig_idx].fingerprint ) {
strcpy( sigmeta->extended_info[sig_idx].fingerprint, fpr );
sigmeta->extended_info[sig_idx].fingerprint[strlen( fpr )] = '\0';
}
} else
break; // if allocation fails once, it isn't likely to
// succeed the next time either
fpr = gpgme_get_sig_status (ctx, ++sig_idx, &status, &created);
}
sigmeta->extended_info_count = sig_idx;
sigmeta->nota_xml = gpgme_get_notation( ctx );
sigmeta->status_code = status;
gpgme_release( ctx );
return ( status == GPGME_SIG_STAT_GOOD );
}
bool storeCertificatesFromMessage(
const char* ciphertext ){ return true; }
/* returns address if address doesn't contain a <xxx> part
* else it returns a new string xxx and frees address
*/
static char* parseAddress( char* address )
{
char* result = address;
char* i;
char* j;
if( !result ) return result;
i = index( address, '<' );
if( i ) {
j = index( i+1, '>' );
if( j == NULL ) j = address+strlen(address);
result = malloc( j-i );
strncpy( result, i+1, j-i-1 );
result[j-i-1] = '\0';
free( address );
} else {
i = address;
j = i+strlen(address);
}
{
/* remove surrounding whitespace */
char* k = result+(j-i-1);
char* l = result;
while( isspace( *l ) ) ++l;
while( isspace( *k ) ) --k;
if( l != result || k != result+(j-i-1) ) {
char* result2 = malloc( k-l+2 );
strncpy( result2, l, k-l+1 );
result2[k-l+1] = '\0';
free(result);
result = result2;
}
}
return result;
}
static char* nextAddress( const char** address )
{
const char *start = *address;
char* result = NULL;
int quote = 0;
int comment = 0;
int found = 0;
if( *address == NULL ) return NULL;
while( **address ) {
switch( **address ) {
case '\\': /* escaped character */
++(*address);
break;
case '"':
if( comment == 0 ) {
if( quote > 0 ) --quote;
else ++quote;
}
break;
case '(': /* comment start */
if( quote == 0 ) ++comment;
break;
case ')': /* comment end */
if( quote == 0 ) --comment;
break;
case '\0':
case '\1': /* delimiter */
if( quote == 0 && comment == 0 ) {
found = 1;
}
break;
}
++(*address);
if( found ) break;
}
if( found || **address == 0 ) {
size_t len;
len = *address - start;
if( len > 0 ) {
if( **address != 0 ) --len;
result = malloc( len*sizeof(char)+1 );
strncpy( result, start, len );
result[len] = '\0';
}
}
return parseAddress(result);
}
/*
Find all certificate for a given addressee and return them in a
'\1' separated list.
NOTE: The certificate parameter must point to an allready allocated
block of memory which is large enough to hold the complete list.
*/
bool findCertificates( const char* addressee, char** certificates )
{
GpgmeCtx ctx;
GpgmeError err;
GpgmeKey rKey;
const char *s;
const char *s2;
bool bOk = false;
gpgme_new (&ctx);
gpgme_set_protocol (ctx, GPGMEPLUG_PROTOCOL);
err = gpgme_op_keylist_start(ctx, addressee, 0);
while( GPGME_No_Error == err ) {
err = gpgme_op_keylist_next(ctx, &rKey);
if( GPGME_No_Error == err ) {
bOk = true;
s = gpgme_key_get_string_attr (rKey, GPGME_ATTR_USERID, NULL, 0);
if( s ) {
s2 = gpgme_key_get_string_attr (rKey, GPGME_ATTR_FPR, NULL, 0);
if( s2 ) {
strcat( *certificates, s );
strcat( *certificates, "(" );
strcat( *certificates, s2 );
strcat( *certificates, ")\1" );
}
}
}
}
gpgme_op_keylist_end( ctx );
return bOk;
}
bool encryptMessage( const char* cleartext,
const char** ciphertext,
const char* certificate,
struct StructuringInfo* structuring )
{
GpgmeCtx ctx;
GpgmeError err;
GpgmeData gCiphertext, gPlaintext;
GpgmeRecipients rset;
size_t rCLen = 0;
char* rCiph = 0;
bool bOk = false;
init_StructuringInfo( structuring );
gpgme_new (&ctx);
gpgme_set_protocol (ctx, GPGMEPLUG_PROTOCOL);
gpgme_set_armor (ctx, 1);
gpgme_set_textmode (ctx, 1);
gpgme_data_new_from_mem (&gPlaintext, cleartext,
1+strlen( cleartext ), 1 );
err = gpgme_data_new ( &gCiphertext );
gpgme_recipients_new (&rset);
/*
if( GPGMEPLUG_PROTOCOL == GPGME_PROTOCOL_CMS )
{
gpgme_recipients_add_name_with_validity (rset,
"/CN=test cert 1,OU=Aegypten Project,O=g10 Code GmbH,L=Düsseldorf,C=DE",
GPGME_VALIDITY_FULL );
fputs( "\nGPGSMPLUG encryptMessage() using test key of Aegypten Project\n", stderr );
}
else
*/
{
const char* p = certificate;
char* tok;
while( (tok = nextAddress( &p ) ) != 0 ) {
if( GPGMEPLUG_PROTOCOL == GPGME_PROTOCOL_CMS )
gpgme_recipients_add_name_with_validity (rset, tok, GPGME_VALIDITY_FULL );
else
gpgme_recipients_add_name (rset, tok);
fprintf( stderr, "\nGPGMEPLUG encryptMessage() using addressee %s\n", tok );
free(tok);
}
}
// PENDING(g10) Implement this
// Possible values: RSA = 1, SHA1 = 2, TripleDES = 3
//gpgme_set_encryption_algorithm( ctx, config.encryptionAlgorithm );
// PENDING(g10) Implement this
// gpgme_set_encryption_check_certificate_path(
// config.checkCertificatePath )
// PENDING(g10) Implement this
// gpgme_set_encryption_check_certificate_path_to_root(
// config.checkEncryptionCertificatePathToRoot )
err = gpgme_op_encrypt (ctx, rset, gPlaintext, gCiphertext );
if( err )
fprintf( stderr, "gpgme_op_encrypt() returned this error code: %i\n\n", err );
gpgme_recipients_release (rset);
gpgme_data_release (gPlaintext);
if( !err ) {
rCiph = gpgme_data_release_and_get_mem( gCiphertext, &rCLen );
*ciphertext = malloc( rCLen + 1 );
if( *ciphertext ) {
if( rCLen ) {
bOk = true;
strncpy((char*)*ciphertext, rCiph, rCLen );
}
((char*)(*ciphertext))[rCLen] = 0;
}
free( rCiph );
}
else {
gpgme_data_release ( gCiphertext );
*ciphertext = 0;
// hier fehlt eine Fehlerbehandlung: fuer einen Recipient nur ein
// untrusted key (oder gar keiner) gefunden wurde, verweigert gpg
// das signieren.
}
gpgme_release (ctx);
fflush( stderr );
if( bOk && structuring ) {
structuring->includeCleartext = GPGMEPLUG_ENC_INCLUDE_CLEARTEXT;
structuring->makeMimeObject = GPGMEPLUG_ENC_MAKE_MIME_OBJECT;
if( structuring->makeMimeObject ) {
structuring->makeMultiMime = GPGMEPLUG_ENC_MAKE_MULTI_MIME;
storeNewCharPtr( &structuring->contentTypeMain,
GPGMEPLUG_ENC_CTYPE_MAIN );
storeNewCharPtr( &structuring->contentDispMain,
GPGMEPLUG_ENC_CDISP_MAIN );
storeNewCharPtr( &structuring->contentTEncMain,
GPGMEPLUG_ENC_CTENC_MAIN );
if( structuring->makeMultiMime ) {
storeNewCharPtr( &structuring->contentTypeVersion,
GPGMEPLUG_ENC_CTYPE_VERSION );
storeNewCharPtr( &structuring->contentDispVersion,
GPGMEPLUG_ENC_CDISP_VERSION );
storeNewCharPtr( &structuring->contentTEncVersion,
GPGMEPLUG_ENC_CTENC_VERSION );
storeNewCharPtr( &structuring->bodyTextVersion,
GPGMEPLUG_ENC_BTEXT_VERSION );
storeNewCharPtr( &structuring->contentTypeCode,
GPGMEPLUG_ENC_CTYPE_CODE );
storeNewCharPtr( &structuring->contentDispCode,
GPGMEPLUG_ENC_CDISP_CODE );
storeNewCharPtr( &structuring->contentTEncCode,
GPGMEPLUG_ENC_CTENC_CODE );
}
} else {
storeNewCharPtr( &structuring->flatTextPrefix,
GPGMEPLUG_ENC_FLAT_PREFIX );
storeNewCharPtr( &structuring->flatTextSeparator,
GPGMEPLUG_ENC_FLAT_SEPARATOR );
storeNewCharPtr( &structuring->flatTextPostfix,
GPGMEPLUG_ENC_FLAT_POSTFIX );
}
}
return bOk;
}
bool encryptAndSignMessage( const char* cleartext,
const char** ciphertext,
const char* certificate,
struct StructuringInfo* structuring )
{
bool bOk;
init_StructuringInfo( structuring );
bOk = false;
// implementation of this function is still missing
if( bOk && structuring ) {
structuring->includeCleartext = GPGMEPLUG_ENCSIGN_INCLUDE_CLEARTEXT;
structuring->makeMimeObject = GPGMEPLUG_ENCSIGN_MAKE_MIME_OBJECT;
if( structuring->makeMimeObject ) {
structuring->makeMultiMime = GPGMEPLUG_ENCSIGN_MAKE_MULTI_MIME;
storeNewCharPtr( &structuring->contentTypeMain,
GPGMEPLUG_ENCSIGN_CTYPE_MAIN );
storeNewCharPtr( &structuring->contentDispMain,
GPGMEPLUG_ENCSIGN_CDISP_MAIN );
storeNewCharPtr( &structuring->contentTEncMain,
GPGMEPLUG_ENCSIGN_CTENC_MAIN );
if( structuring->makeMultiMime ) {
storeNewCharPtr( &structuring->contentTypeVersion,
GPGMEPLUG_ENCSIGN_CTYPE_VERSION );
storeNewCharPtr( &structuring->contentDispVersion,
GPGMEPLUG_ENCSIGN_CDISP_VERSION );
storeNewCharPtr( &structuring->contentTEncVersion,
GPGMEPLUG_ENCSIGN_CTENC_VERSION );
storeNewCharPtr( &structuring->bodyTextVersion,
GPGMEPLUG_ENCSIGN_BTEXT_VERSION );
storeNewCharPtr( &structuring->contentTypeCode,
GPGMEPLUG_ENCSIGN_CTYPE_CODE );
storeNewCharPtr( &structuring->contentDispCode,
GPGMEPLUG_ENCSIGN_CDISP_CODE );
storeNewCharPtr( &structuring->contentTEncCode,
GPGMEPLUG_ENCSIGN_CTENC_CODE );
}
} else {
storeNewCharPtr( &structuring->flatTextPrefix,
GPGMEPLUG_ENCSIGN_FLAT_PREFIX );
storeNewCharPtr( &structuring->flatTextSeparator,
GPGMEPLUG_ENCSIGN_FLAT_SEPARATOR );
storeNewCharPtr( &structuring->flatTextPostfix,
GPGMEPLUG_ENCSIGN_FLAT_POSTFIX );
}
}
return bOk;
}
bool decryptMessage( const char* ciphertext,
const char** cleartext,
const char* certificate )
{
GpgmeCtx ctx;
GpgmeError err;
GpgmeData gCiphertext, gPlaintext;
size_t rCLen = 0;
char* rCiph = 0;
bool bOk = false;
if( !ciphertext )
return false;
err = gpgme_new (&ctx);
gpgme_set_protocol (ctx, GPGMEPLUG_PROTOCOL);
gpgme_data_new_from_mem( &gCiphertext, ciphertext,
1+strlen( ciphertext ), 1 );
gpgme_data_new( &gPlaintext );
gpgme_op_decrypt( ctx, gCiphertext, gPlaintext );
gpgme_data_release( gCiphertext );
rCiph = gpgme_data_release_and_get_mem( gPlaintext, &rCLen );
*cleartext = malloc( rCLen + 1 );
if( *cleartext ) {
if( rCLen ) {
bOk = true;
strncpy((char*)*cleartext, rCiph, rCLen );
}
((char*)(*cleartext))[rCLen] = 0;
}
free( rCiph );
gpgme_release( ctx );
return bOk;
}
bool decryptAndCheckMessage( const char* ciphertext,
const char** cleartext, const char* certificate,
struct SignatureMetaData* sigmeta ){ return true; }
const char* requestCertificateDialog(){ return 0; }
bool requestDecentralCertificate( const char* name, const char*
email, const char* organization, const char* department,
const char* ca_address ){ return true; }
bool requestCentralCertificateAndPSE( const char* name,
const char* email, const char* organization, const char* department,
const char* ca_address ){ return true; }
bool createPSE(){ return true; }
bool registerCertificate( const char* certificate ){ return true; }
bool requestCertificateProlongation( const char* certificate,
const char* ca_address ){ return true; }
const char* certificateChain(){ return 0; }
bool deleteCertificate( const char* certificate ){ return true; }
bool archiveCertificate( const char* certificate ){ return true; }
const char* displayCRL(){ return 0; }
void updateCRL(){}
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