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tdepim/libkpgp/kpgpbase5.cpp

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/*
kpgpbase5.cpp
Copyright (C) 2001,2002 the KPGP authors
See file AUTHORS.kpgp for details
This file is part of KPGP, the KDE PGP/GnuPG support library.
KPGP 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.
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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "kpgpbase.h"
#include "kpgp.h"
#include <string.h> /* strncmp */
#include <assert.h>
#include <tqregexp.h>
#include <tqdatetime.h>
#include <tdelocale.h>
#include <kprocess.h>
#include <kdebug.h>
namespace Kpgp {
Base5::Base5()
: Base()
{
}
Base5::~Base5()
{
}
int
Base5::encrypt( Block& block, const KeyIDList& recipients )
{
return encsign( block, recipients, 0 );
}
int
Base5::clearsign( Block& block, const char *passphrase )
{
return encsign( block, KeyIDList(), passphrase );
}
int
Base5::encsign( Block& block, const KeyIDList& recipients,
const char *passphrase )
{
TQCString cmd;
int exitStatus = 0;
int index;
// used to work around a bug in pgp5. pgp5 treats files
// with non ascii chars (umlauts, etc...) as binary files, but
// we want a clear signature
bool signonly = false;
if(!recipients.isEmpty() && passphrase != 0)
cmd = "pgpe +batchmode -afts ";
else if(!recipients.isEmpty())
cmd = "pgpe +batchmode -aft ";
else if(passphrase != 0)
{
cmd = "pgps +batchmode -abft ";
signonly = true;
}
else
{
errMsg = i18n("Neither recipients nor passphrase specified.");
return OK;
}
if(passphrase != 0)
cmd += addUserId();
if(!recipients.isEmpty())
{
if(Module::getKpgp()->encryptToSelf())
{
cmd += " -r 0x";
cmd += Module::getKpgp()->user();
}
for( KeyIDList::ConstIterator it = recipients.begin();
it != recipients.end(); ++it ) {
cmd += " -r 0x";
cmd += (*it);
}
}
clear();
input = block.text();
if (signonly)
{
input.append("\n");
input.replace(TQRegExp("[ \t]+\n"), "\n"); //strip trailing whitespace
}
//We have to do this otherwise it's all in vain
exitStatus = run(cmd.data(), passphrase);
block.setError( error );
if(exitStatus != 0)
status = ERROR;
// now parse the returned info
if(error.find("Cannot unlock private key") != -1)
{
errMsg = i18n("The passphrase you entered is invalid.");
status |= ERROR;
status |= BADPHRASE;
}
//if(!ignoreUntrusted)
//{
TQCString aStr;
index = -1;
while((index = error.find("WARNING: The above key",index+1)) != -1)
{
int index2 = error.find("But you previously",index);
int index3 = error.find("WARNING: The above key",index+1);
if(index2 == -1 || (index2 > index3 && index3 != -1))
{
// the key wasn't valid, no encryption to this person
// extract the person
index2 = error.find('\n',index);
index3 = error.find('\n',index2+1);
aStr += error.mid(index2+1, index3-index2-1);
aStr += ", ";
}
}
if(!aStr.isEmpty())
{
aStr.truncate(aStr.length()-2);
if(error.find("No valid keys found") != -1)
errMsg = i18n("The key(s) you want to encrypt your message "
"to are not trusted. No encryption done.");
else
errMsg = i18n("The following key(s) are not trusted:\n%1\n"
"Their owner(s) will not be able to decrypt the message.")
.arg(TQString(aStr));
status |= ERROR;
status |= BADKEYS;
}
//}
if((index = error.find("No encryption keys found for")) != -1)
{
index = error.find(':',index);
int index2 = error.find('\n',index);
errMsg = i18n("Missing encryption key(s) for:\n%1")
.arg(TQString(error.mid(index,index2-index)));
// errMsg = TQString("Missing encryption key(s) for: %1")
// .arg(error.mid(index,index2-index));
status |= ERROR;
status |= MISSINGKEY;
}
if(signonly) {
// dash-escape the input
if (input[0] == '-')
input = "- " + input;
for ( int idx = 0 ; (idx = input.find("\n-", idx)) >= 0 ; idx += 4 )
input.replace(idx, 2, "\n- -");
output = "-----BEGIN PGP SIGNED MESSAGE-----\n\n" + input + "\n" + output;
}
block.setProcessedText( output );
block.setStatus( status );
return status;
}
int
Base5::decrypt( Block& block, const char *passphrase )
{
int exitStatus = 0;
clear();
input = block.text();
exitStatus = run("pgpv -f +batchmode=1", passphrase);
if( !output.isEmpty() )
block.setProcessedText( output );
block.setError( error );
if(exitStatus == -1) {
errMsg = i18n("Error running PGP");
status = RUN_ERR;
block.setStatus( status );
return status;
}
// lets parse the returned information.
int index;
index = error.find("Cannot decrypt message");
if(index != -1)
{
//kdDebug(5100) << "message is encrypted" << endl;
status |= ENCRYPTED;
// ok. we have an encrypted message. Is the passphrase bad,
// or do we not have the secret key?
if(error.find("Need a pass phrase") != -1)
{
if(passphrase != 0)
{
errMsg = i18n("Bad passphrase; could not decrypt.");
kdDebug(5100) << "Base: passphrase is bad" << endl;
status |= BADPHRASE;
status |= ERROR;
}
}
else
{
// we don't have the secret key
status |= NO_SEC_KEY;
status |= ERROR;
errMsg = i18n("You do not have the secret key needed to decrypt this message.");
kdDebug(5100) << "Base: no secret key for this message" << endl;
}
// check for persons
#if 0
// ##### FIXME: This information is anyway currently not used
// I'll change it to always determine the recipients.
index = error.find("can only be decrypted by:");
if(index != -1)
{
index = error.find('\n',index);
int end = error.find("\n\n",index);
mRecipients.clear();
int index2;
while( (index2 = error.find('\n',index+1)) <= end )
{
TQCString item = error.mid(index+1,index2-index-1);
item.stripWhiteSpace();
mRecipients.append(item);
index = index2;
}
}
#endif
}
index = error.find("Good signature");
if(index != -1)
{
//kdDebug(5100) << "good signature" << endl;
status |= SIGNED;
status |= GOODSIG;
// get key ID of signer
index = error.find("Key ID ", index) + 7;
block.setSignatureKeyId( error.mid(index, 8) );
// get signer
index = error.find('"',index) + 1;
int index2 = error.find('"', index);
block.setSignatureUserId( error.mid(index, index2-index) );
/// ### FIXME get signature date
block.setSignatureDate( "" );
}
index = error.find("BAD signature");
if(index != -1)
{
//kdDebug(5100) << "BAD signature" << endl;
status |= SIGNED;
status |= ERROR;
// get key ID of signer
index = error.find("Key ID ", index) + 7;
block.setSignatureKeyId( error.mid(index, 8) );
// get signer
index = error.find('"',index) + 1;
int index2 = error.find('"', index);
block.setSignatureUserId( error.mid(index, index2-index) );
/// ### FIXME get signature date
block.setSignatureDate( "" );
}
index = error.find("Signature by unknown key");
if(index != -1)
{
index = error.find("keyid: 0x",index) + 9;
block.setSignatureKeyId( error.mid(index, 8) );
block.setSignatureUserId( TQString() );
// FIXME: not a very good solution...
status |= SIGNED;
status |= GOODSIG;
/// ### FIXME get signature date
block.setSignatureDate( "" );
}
//kdDebug(5100) << "status = " << status << endl;
block.setStatus( status );
return status;
}
Key*
Base5::readPublicKey( const KeyID& keyId, const bool readTrust, Key* key )
{
int exitStatus = 0;
status = 0;
exitStatus = run( "pgpk -ll 0x" + keyId, 0, true );
if(exitStatus != 0) {
status = ERROR;
return 0;
}
key = parseSingleKey( output, key );
if( key == 0 )
{
return 0;
}
if( readTrust )
{
exitStatus = run( "pgpk -c 0x" + keyId, 0, true );
if(exitStatus != 0) {
status = ERROR;
return 0;
}
parseTrustDataForKey( key, output );
}
return key;
}
KeyList
Base5::publicKeys( const TQStringList & patterns )
{
int exitStatus = 0;
TQCString cmd = "pgpk -ll";
for ( TQStringList::ConstIterator it = patterns.begin();
it != patterns.end(); ++it ) {
cmd += " ";
cmd += TDEProcess::quote( *it ).local8Bit();
}
status = 0;
exitStatus = run( cmd, 0, true );
if(exitStatus != 0) {
status = ERROR;
return KeyList();
}
// now we need to parse the output for public keys
KeyList keys = parseKeyList( output, false );
// sort the list of public keys
keys.sort();
return keys;
}
KeyList
Base5::secretKeys( const TQStringList & patterns )
{
int exitStatus = 0;
status = 0;
TQCString cmd = "pgpk -ll";
for ( TQStringList::ConstIterator it = patterns.begin();
it != patterns.end(); ++it ) {
cmd += " ";
cmd += TDEProcess::quote( *it ).local8Bit();
}
status = 0;
exitStatus = run( cmd, 0, true );
if(exitStatus != 0) {
status = ERROR;
return KeyList();
}
// now we need to parse the output for secret keys
KeyList keys = parseKeyList( output, true );
// sort the list of public keys
keys.sort();
return keys;
}
TQCString Base5::getAsciiPublicKey(const KeyID& keyID)
{
int exitStatus = 0;
if (keyID.isEmpty())
return TQCString();
status = 0;
exitStatus = run( "pgpk -xa 0x" + keyID, 0, true );
if(exitStatus != 0) {
status = ERROR;
return TQCString();
}
return output;
}
int
Base5::signKey(const KeyID& keyID, const char *passphrase)
{
TQCString cmd;
int exitStatus = 0;
if(passphrase == 0) return false;
cmd = "pgpk -s -f +batchmode=1 0x";
cmd += keyID;
cmd += addUserId();
status = 0;
exitStatus = run(cmd.data(), passphrase);
if (exitStatus != 0)
status = ERROR;
return status;
}
//-- private functions --------------------------------------------------------
Key*
Base5::parseKeyData( const TQCString& output, int& offset, Key* key /* = 0 */ )
// This function parses the data for a single key which is output by PGP 5
// with the following command line:
// pgpk -ll
// It expects the key data to start at offset and returns the start of
// the next key's data in offset.
{
if( ( strncmp( output.data() + offset, "pub", 3 ) != 0 ) &&
( strncmp( output.data() + offset, "sec", 3 ) != 0 ) )
{
kdDebug(5100) << "Unknown key type or corrupt key data.\n";
return 0;
}
if( key == 0 )
key = new Key();
else
key->clear();
Subkey *subkey = 0;
bool primaryKey = true;
while( true )
{
int eol;
// search the end of the current line
eol = output.find( '\n', offset );
if( ( eol == -1 ) || ( eol == offset ) )
break;
//kdDebug(5100) << "Parsing: " << output.mid(offset, eol-offset) << endl;
if( !strncmp( output.data() + offset, "pub", 3 ) ||
!strncmp( output.data() + offset, "sec", 3 ) ||
!strncmp( output.data() + offset, "sub", 3 ) )
{ // line contains key data
//kdDebug(5100)<<"Key data:\n";
int pos, pos2;
subkey = new Subkey( "", false );
key->addSubkey( subkey );
// Key Flags
/* From the PGP 5 manual page for pgpk:
Following this column is a single character which
describes other attributes of the object:
@ The object is disabled
+ The object is axiomatically trusted (i.e., it's
your key)
*/
switch( output[offset+3] )
{
case ' ': // nothing special
break;
case '@': // disabled key
subkey->setDisabled( true );
key->setDisabled( true );
break;
default: // all other flags are ignored
//kdDebug(5100) << "Unknown key flag.\n";
;
}
// Key Length
pos = offset + 4;
while( output[pos] == ' ' )
pos++;
pos2 = output.find( ' ', pos );
subkey->setKeyLength( output.mid( pos, pos2-pos ).toUInt() );
//kdDebug(5100) << "Key Length: "<<subkey->keyLength()<<endl;
// Key ID
pos = pos2 + 1;
while( output[pos] == ' ' )
pos++;
pos += 2; // skip the '0x'
pos2 = output.find( ' ', pos );
subkey->setKeyID( output.mid( pos, pos2-pos ) );
//kdDebug(5100) << "Key ID: "<<subkey->keyID()<<endl;
// Creation Date
pos = pos2 + 1;
while( output[pos] == ' ' )
pos++;
pos2 = output.find( ' ', pos );
int year = output.mid( pos, 4 ).toInt();
int month = output.mid( pos+5, 2 ).toInt();
int day = output.mid( pos+8, 2 ).toInt();
TQDateTime dt( TQDate( year, month, day ), TQTime( 00, 00 ) );
TQDateTime epoch( TQDate( 1970, 01, 01 ), TQTime( 00, 00 ) );
// The calculated creation date isn't exactly correct because TQDateTime
// doesn't know anything about timezones and always assumes local time
// although epoch is of course UTC. But as PGP 5 anyway doesn't print
// the time this doesn't matter too much.
subkey->setCreationDate( epoch.secsTo( dt ) );
// Expiration Date
// if the primary key has been revoked the expiration date is not printed
if( primaryKey || !key->revoked() )
{
pos = pos2 + 1;
while( output[pos] == ' ' )
pos++;
pos2 = output.find( ' ', pos );
if( output[pos] == '-' )
{ // key doesn't expire
subkey->setExpirationDate( -1 );
}
else if( !strncmp( output.data() + pos, "*REVOKED*", 9 ) )
{ // key has been revoked
subkey->setRevoked( true );
key->setRevoked( true );
}
else
{
int year = output.mid( pos, 4 ).toInt();
int month = output.mid( pos+5, 2 ).toInt();
int day = output.mid( pos+8, 2 ).toInt();
TQDateTime dt( TQDate( year, month, day ), TQTime( 00, 00 ) );
subkey->setCreationDate( epoch.secsTo( dt ) );
// has the key already expired?
if( TQDateTime::currentDateTime() >= dt )
{
subkey->setExpired( true );
key->setExpired( true );
}
}
}
else if( key->revoked() )
subkey->setRevoked( true );
// Key algorithm (RSA, DSS, Diffie-Hellman)
bool sign = false;
bool encr = false;
pos = pos2 + 1;
while( output[pos] == ' ' )
pos++;
pos2 = output.find( ' ', pos );
if( !strncmp( output.data() + pos, "RSA", 3 ) )
{
sign = true;
encr = true;
}
else if( !strncmp( output.data() + pos, "DSS", 3 ) )
sign = true;
else if( !strncmp( output.data() + pos, "Diffie-Hellman", 14 ) )
encr = true;
else
kdDebug(5100)<<"Unknown key algorithm\n";
// set key capabilities of the subkey
subkey->setCanEncrypt( encr );
subkey->setCanSign( sign );
subkey->setCanCertify( sign );
if( primaryKey )
{
// Global key capabilities
bool canSign = false;
bool canEncr = false;
pos = pos2 + 1;
while( output[pos] == ' ' )
pos++;
pos2 = eol;
if( !strncmp( output.data() + pos, "Sign & Encrypt", 14 ) )
{
canSign = true;
canEncr = true;
}
else if( !strncmp( output.data() + pos, "Sign only", 9 ) )
canSign = true;
else if( !strncmp( output.data() + pos, "Encrypt only", 12 ) )
canEncr = true;
else
kdDebug(5100)<<"Unknown key capability\n";
// set the global key capabilities
if( !key->expired() && !key->revoked() )
{
key->setCanEncrypt( canEncr );
key->setCanSign( canSign );
key->setCanCertify( canSign );
}
//kdDebug(5100)<<"Key capabilities: "<<(key->canEncrypt()?"E":"")<<(key->canSign()?"SC":"")<<endl;
primaryKey = false;
}
}
else if( !strncmp( output.data() + offset, "f16", 3 ) ||
!strncmp( output.data() + offset, "f20", 3 ) )
{ // line contains a fingerprint
/* Examples:
f16 Fingerprint16 = DE 2A 77 08 78 64 7C 42 72 75 B1 A7 3E 42 3F 79
f20 Fingerprint20 = 226F 4B63 6DA2 7389 91D1 2A49 D58A 3EC1 5214 181E
*/
int pos = output.find( '=', offset+3 ) + 2;
TQCString fingerprint = output.mid( pos, eol-pos );
// remove white space from the fingerprint
for ( int idx = 0 ; (idx = fingerprint.find(' ', idx)) >= 0 ; )
fingerprint.replace( idx, 1, "" );
assert( subkey != 0 );
subkey->setFingerprint( fingerprint );
//kdDebug(5100)<<"Fingerprint: "<<fingerprint<<endl;
}
else if( !strncmp( output.data() + offset, "uid", 3 ) )
{ // line contains a uid
int pos = offset+5;
TQCString uid = output.mid( pos, eol-pos );
key->addUserID( uid );
// displaying of uids which contain non-ASCII characters is broken in
// PGP 5.0i; it shows these characters as \ooo and truncates the uid
// because it doesn't take the 3 extra characters per non-ASCII char
// into account. Example (with an UTF-8 encoded &ouml;):
// uid Ingo Kl\303\266cker <ingo.kloecker@epo
// because of this and because we anyway don't know which charset was
// used to encode the uid we don't try to decode it
}
else if ( !strncmp( output.data() + offset, "sig", 3 ) ||
!strncmp( output.data() + offset, "SIG", 3 ) ||
!strncmp( output.data() + offset, "ret", 3 ) )
{ // line contains a signature
// SIG = sig with own key; ret = sig with revoked key
// we ignore it for now
}
offset = eol + 1;
}
return key;
}
Key*
Base5::parseSingleKey( const TQCString& output, Key* key /* = 0 */ )
{
int offset;
// search start of header line
if( !strncmp( output.data(), "Type Bits", 9 ) )
offset = 0;
else
{
offset = output.find( "\nType Bits" ) + 1;
if( offset == 0 )
return 0;
}
// key data begins in the next line
offset = output.find( '\n', offset ) + 1;
if( offset == -1 )
return 0;
key = parseKeyData( output, offset, key );
//kdDebug(5100) << "finished parsing keys" << endl;
return key;
}
KeyList
Base5::parseKeyList( const TQCString& output, bool onlySecretKeys )
{
KeyList keys;
Key *key = 0;
int offset;
// search start of header line
if( !strncmp( output.data(), "Type Bits", 9 ) )
offset = 0;
else
{
offset = output.find( "\nType Bits" ) + 1;
if( offset == 0 )
return keys;
}
// key data begins in the next line
offset = output.find( '\n', offset ) + 1;
if( offset == -1 )
return keys;
do
{
key = parseKeyData( output, offset );
if( key != 0 )
{
// if only secret keys should be read test if the key is secret
if( !onlySecretKeys || !key->secret() )
keys.append( key );
// skip the blank line which separates the keys
offset++;
}
}
while( key != 0 );
//kdDebug(5100) << "finished parsing keys" << endl;
return keys;
}
void
Base5::parseTrustDataForKey( Key* key, const TQCString& str )
{
if( ( key == 0 ) || str.isEmpty() )
return;
TQCString keyID = "0x" + key->primaryKeyID();
UserIDList userIDs = key->userIDs();
// search the start of the trust data
int offset = str.find( "\n\n KeyID" ) + 9;
if( offset == -1 + 9 )
return;
offset = str.find( '\n', offset ) + 1;
if( offset == -1 + 1 )
return;
bool ultimateTrust = false;
if( !strncmp( str.data() + offset+13, "ultimate", 8 ) )
ultimateTrust = true;
while( true )
{ // loop over all trust information about this key
int eol;
// search the end of the current line
if( ( eol = str.find( '\n', offset ) ) == -1 )
break;
if( str[offset+23] != ' ' )
{ // line contains a validity value for a user ID
// determine the validity
Validity validity = KPGP_VALIDITY_UNKNOWN;
if( !strncmp( str.data() + offset+23, "complete", 8 ) )
if( ultimateTrust )
validity = KPGP_VALIDITY_ULTIMATE;
else
validity = KPGP_VALIDITY_FULL;
else if( !strncmp( str.data() + offset+23, "marginal", 8 ) )
validity = KPGP_VALIDITY_MARGINAL;
else if( !strncmp( str.data() + offset+23, "invalid", 7 ) )
validity = KPGP_VALIDITY_UNDEFINED;
// determine the user ID
int pos = offset + 33;
TQString uid = str.mid( pos, eol-pos );
// set the validity of the corresponding user ID
for( UserIDListIterator it( userIDs ); it.current(); ++it )
if( (*it)->text() == uid )
{
kdDebug(5100)<<"Setting the validity of "<<uid<<" to "<<validity<<endl;
(*it)->setValidity( validity );
break;
}
}
offset = eol + 1;
}
}
} // namespace Kpgp
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