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/*
* Copyright (C) 2000,2001,2002 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS 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.
*
* GNUTLS 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_alert.h>
#include <gnutls_record.h>
#include <debug.h>
typedef struct {
AlertDescription alert;
char *desc;
} gnutls_alert_entry;
static const gnutls_alert_entry sup_alerts[] = {
{ GNUTLS_A_CLOSE_NOTIFY, "Close notify" },
{ GNUTLS_A_UNEXPECTED_MESSAGE, "Unexpected message" },
{ GNUTLS_A_BAD_RECORD_MAC, "Bad record MAC" },
{ GNUTLS_A_DECRYPTION_FAILED, "Decryption failed" },
{ GNUTLS_A_RECORD_OVERFLOW, "Record overflow" },
{ GNUTLS_A_DECOMPRESSION_FAILURE, "Decompression failed" },
{ GNUTLS_A_HANDSHAKE_FAILURE, "Handshake failed" },
{ GNUTLS_A_BAD_CERTIFICATE, "Certificate is bad" },
{ GNUTLS_A_UNSUPPORTED_CERTIFICATE, "Certificate is not supported" },
{ GNUTLS_A_CERTIFICATE_REVOKED, "Certificate was revoked" },
{ GNUTLS_A_CERTIFICATE_EXPIRED, "Certificate is expired" },
{ GNUTLS_A_CERTIFICATE_UNKNOWN, "Unknown certificate" },
{ GNUTLS_A_ILLEGAL_PARAMETER, "Illegal parameter" },
{ GNUTLS_A_UNKNOWN_CA, "CA is unknown" },
{ GNUTLS_A_ACCESS_DENIED, "Access was denied" },
{ GNUTLS_A_DECODE_ERROR, "Decode error" },
{ GNUTLS_A_DECRYPT_ERROR, "Decrypt error" },
{ GNUTLS_A_EXPORT_RESTRICTION, "Export restriction" },
{ GNUTLS_A_PROTOCOL_VERSION, "Error in protocol version" },
{ GNUTLS_A_INSUFFICIENT_SECURITY,"Insufficient security" },
{ GNUTLS_A_USER_CANCELED, "User canceled" },
{ GNUTLS_A_NO_RENEGOTIATION, "No renegotiation is allowed" },
{0, NULL}
};
#define GNUTLS_ALERT_LOOP(b) \
const gnutls_alert_entry *p; \
for(p = sup_alerts; p->desc != NULL; p++) { b ; }
#define GNUTLS_ALERT_ID_LOOP(a) \
GNUTLS_ALERT_LOOP( if(p->alert == alert) { a; break; })
/**
* gnutls_alert_send - This function sends an alert message to the peer
* @state: is a &GNUTLS_STATE structure.
* @level: is the level of the alert
* @desc: is the alert description
*
* This function will send an alert to the peer in order to inform
* him of something important (eg. his Certificate could not be verified).
* If the alert level is Fatal then the peer is expected to close the
* connection, otherwise he may ignore the alert and continue.
* Returns 0 on success.
*
**/
int gnutls_alert_send( GNUTLS_STATE state, GNUTLS_AlertLevel level, GNUTLS_AlertDescription desc)
{
uint8 data[2];
int ret;
data[0] = (uint8) level;
data[1] = (uint8) desc;
_gnutls_record_log( "REC: Sending Alert[%d|%d] - %s\n", data[0], data[1], _gnutls_alert_get_name((int)data[1]));
if ( (ret = gnutls_send_int( state, GNUTLS_ALERT, -1, data, 2)) >= 0)
return 0;
else
return ret;
}
/* Sends the appropriate alert, depending
* on the error message.
*/
/**
* gnutls_alert_send_appropriate - This function sends an alert to the peer depending on the error code
* @state: is a &GNUTLS_STATE structure.
* @err: is an integer
*
* Sends an alert to the peer depending on the error code returned by a gnutls
* function. All alerts sent by this function are fatal, so connection should
* be considered terminated after calling this function. The only exception
* is when err == GNUTLS_E_REHANDSHAKE, then a warning alert is sent to
* the peer indicating the no renegotiation will be performed.
*
* This function may also return GNUTLS_E_AGAIN, or GNUTLS_E_INTERRUPTED.
*
* If the return value is GNUTLS_E_UNIMPLEMENTED_FEATURE, then no alert has
* been sent to the peer.
*
**/
int gnutls_alert_send_appropriate( GNUTLS_STATE state, int err) {
int ret = GNUTLS_E_UNIMPLEMENTED_FEATURE;
switch (err) { /* send appropriate alert */
case GNUTLS_E_DECRYPTION_FAILED:
/* GNUTLS_A_DECRYPTION_FAILED is not sent, because
* it is not defined in SSL3.
*/
ret = gnutls_alert_send( state, GNUTLS_AL_FATAL, GNUTLS_A_BAD_RECORD_MAC);
break;
case GNUTLS_E_DECOMPRESSION_FAILED:
ret = gnutls_alert_send( state, GNUTLS_AL_FATAL, GNUTLS_A_DECOMPRESSION_FAILURE);
break;
case GNUTLS_E_ILLEGAL_PARAMETER:
ret = gnutls_alert_send( state, GNUTLS_AL_FATAL, GNUTLS_A_ILLEGAL_PARAMETER);
break;
case GNUTLS_E_ASN1_ELEMENT_NOT_FOUND:
case GNUTLS_E_ASN1_IDENTIFIER_NOT_FOUND:
case GNUTLS_E_ASN1_DER_ERROR:
case GNUTLS_E_ASN1_VALUE_NOT_FOUND:
case GNUTLS_E_ASN1_GENERIC_ERROR:
case GNUTLS_E_ASN1_VALUE_NOT_VALID:
case GNUTLS_E_ASN1_TAG_ERROR:
case GNUTLS_E_ASN1_TAG_IMPLICIT:
case GNUTLS_E_ASN1_TYPE_ANY_ERROR:
case GNUTLS_E_ASN1_SYNTAX_ERROR:
case GNUTLS_E_ASN1_DER_OVERFLOW:
case GNUTLS_E_NO_CERTIFICATE_FOUND:
ret = gnutls_alert_send( state, GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE);
break;
case GNUTLS_E_UNKNOWN_CIPHER_SUITE:
ret = gnutls_alert_send( state, GNUTLS_AL_FATAL, GNUTLS_A_HANDSHAKE_FAILURE);
break;
case GNUTLS_E_UNEXPECTED_PACKET:
ret = gnutls_alert_send( state, GNUTLS_AL_FATAL, GNUTLS_A_UNEXPECTED_MESSAGE);
break;
case GNUTLS_E_REHANDSHAKE:
ret = gnutls_alert_send( state, GNUTLS_AL_WARNING, GNUTLS_A_NO_RENEGOTIATION);
break;
case GNUTLS_E_UNSUPPORTED_VERSION_PACKET:
ret = gnutls_alert_send( state, GNUTLS_AL_WARNING, GNUTLS_A_PROTOCOL_VERSION);
break;
case GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE:
ret = gnutls_alert_send( state, GNUTLS_AL_WARNING, GNUTLS_A_UNSUPPORTED_CERTIFICATE);
break;
case GNUTLS_E_UNEXPECTED_PACKET_LENGTH:
ret = gnutls_alert_send( state, GNUTLS_AL_FATAL, GNUTLS_A_RECORD_OVERFLOW);
break;
}
return ret;
}
/**
* gnutls_alert_get - Returns the last alert number received.
* @state: is a &GNUTLS_STATE structure.
*
* Returns the last alert number received. This function
* should be called if GNUTLS_E_WARNING_ALERT_RECEIVED or
* GNUTLS_E_FATAL_ALERT_RECEIVED has been returned by a gnutls function.
* The peer may send alerts if he thinks some things were not
* right. Check gnutls.h for the available alert descriptions.
**/
GNUTLS_AlertDescription gnutls_alert_get( GNUTLS_STATE state) {
return state->gnutls_internals.last_alert;
}
/**
* gnutls_alert_get_name - Returns a string describing the alert number given
* @alert: is an alert number &GNUTLS_STATE structure.
*
* Returns a string that describes the given alert number.
* See. gnutls_alert_get().
*
**/
const char* gnutls_alert_get_name( int alert) {
char* ret = NULL;
GNUTLS_ALERT_ID_LOOP( ret = p->desc);
return ret;
}
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