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/*
* Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2008, 2010 Free
* Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GNUTLS.
*
* The GNUTLS library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_record.h>
#include <debug.h>
/* I18n of error codes. */
#include "gettext.h"
#define _(String) dgettext (PACKAGE, String)
#define N_(String) gettext_noop (String)
typedef struct
{
gnutls_alert_description_t alert;
const char *desc;
} gnutls_alert_entry;
static const gnutls_alert_entry sup_alerts[] = {
{GNUTLS_A_CLOSE_NOTIFY, N_("Close notify")},
{GNUTLS_A_UNEXPECTED_MESSAGE, N_("Unexpected message")},
{GNUTLS_A_BAD_RECORD_MAC, N_("Bad record MAC")},
{GNUTLS_A_DECRYPTION_FAILED, N_("Decryption failed")},
{GNUTLS_A_RECORD_OVERFLOW, N_("Record overflow")},
{GNUTLS_A_DECOMPRESSION_FAILURE, N_("Decompression failed")},
{GNUTLS_A_HANDSHAKE_FAILURE, N_("Handshake failed")},
{GNUTLS_A_BAD_CERTIFICATE, N_("Certificate is bad")},
{GNUTLS_A_UNSUPPORTED_CERTIFICATE, N_("Certificate is not supported")},
{GNUTLS_A_CERTIFICATE_REVOKED, N_("Certificate was revoked")},
{GNUTLS_A_CERTIFICATE_EXPIRED, N_("Certificate is expired")},
{GNUTLS_A_CERTIFICATE_UNKNOWN, N_("Unknown certificate")},
{GNUTLS_A_ILLEGAL_PARAMETER, N_("Illegal parameter")},
{GNUTLS_A_UNKNOWN_CA, N_("CA is unknown")},
{GNUTLS_A_ACCESS_DENIED, N_("Access was denied")},
{GNUTLS_A_DECODE_ERROR, N_("Decode error")},
{GNUTLS_A_DECRYPT_ERROR, N_("Decrypt error")},
{GNUTLS_A_EXPORT_RESTRICTION, N_("Export restriction")},
{GNUTLS_A_PROTOCOL_VERSION, N_("Error in protocol version")},
{GNUTLS_A_INSUFFICIENT_SECURITY, N_("Insufficient security")},
{GNUTLS_A_USER_CANCELED, N_("User canceled")},
{GNUTLS_A_INTERNAL_ERROR, N_("Internal error")},
{GNUTLS_A_NO_RENEGOTIATION, N_("No renegotiation is allowed")},
{GNUTLS_A_CERTIFICATE_UNOBTAINABLE,
N_("Could not retrieve the specified certificate")},
{GNUTLS_A_UNSUPPORTED_EXTENSION, N_("An unsupported extension was sent")},
{GNUTLS_A_UNRECOGNIZED_NAME,
N_("The server name sent was not recognized")},
{GNUTLS_A_UNKNOWN_PSK_IDENTITY,
N_("The SRP/PSK username is missing or not known")},
{GNUTLS_A_INNER_APPLICATION_FAILURE,
N_("Inner application negotiation failed")},
{GNUTLS_A_INNER_APPLICATION_VERIFICATION,
N_("Inner application verification failed")},
{0, NULL}
};
/**
* gnutls_alert_get_name - Returns a string describing the alert number given
* @alert: is an alert number #gnutls_session_t structure.
*
* This function will return a string that describes the given alert
* number, or %NULL. See gnutls_alert_get().
*
* Returns: string corresponding to #gnutls_alert_description_t value.
**/
const char *
gnutls_alert_get_name (gnutls_alert_description_t alert)
{
const gnutls_alert_entry *p;
for (p = sup_alerts; p->desc != NULL; p++)
if (p->alert == alert)
return _(p->desc);
return NULL;
}
/**
* gnutls_alert_send - send an alert message to the peer
* @session: is a #gnutls_session_t 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.
*
* The error code of the underlying record send function will be
* returned, so you may also receive %GNUTLS_E_INTERRUPTED or
* %GNUTLS_E_AGAIN as well.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
**/
int
gnutls_alert_send (gnutls_session_t session, gnutls_alert_level_t level,
gnutls_alert_description_t desc)
{
uint8_t data[2];
int ret;
const char *name;
data[0] = (uint8_t) level;
data[1] = (uint8_t) desc;
name = gnutls_alert_get_name ((int) data[1]);
if (name == NULL)
name = "(unknown)";
_gnutls_record_log ("REC: Sending Alert[%d|%d] - %s\n", data[0],
data[1], name);
if ((ret = _gnutls_send_int (session, GNUTLS_ALERT, -1, data, 2)) >= 0)
return 0;
else
return ret;
}
/**
* gnutls_error_to_alert - return an alert code based on the given error code
* @err: is a negative integer
* @level: the alert level will be stored there
*
* Get an alert depending on the error code returned by a gnutls
* function. All alerts sent by this function should be considered
* fatal. The only exception is when @err is %GNUTLS_E_REHANDSHAKE,
* where a warning alert should be sent to the peer indicating that no
* renegotiation will be performed.
*
* If there is no mapping to a valid alert the alert to indicate
* internal error is returned.
*
* Returns: the alert code to use for a particular error code.
**/
int
gnutls_error_to_alert (int err, int *level)
{
int ret, _level = -1;
switch (err)
{ /* send appropriate alert */
case GNUTLS_E_DECRYPTION_FAILED:
/* GNUTLS_A_DECRYPTION_FAILED is not sent, because
* it is not defined in SSL3. Note that we must
* not distinguish Decryption failures from mac
* check failures, due to the possibility of some
* attacks.
*/
ret = GNUTLS_A_BAD_RECORD_MAC;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_DECOMPRESSION_FAILED:
ret = GNUTLS_A_DECOMPRESSION_FAILURE;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_RECEIVED_ILLEGAL_PARAMETER:
case GNUTLS_E_ILLEGAL_SRP_USERNAME:
ret = GNUTLS_A_ILLEGAL_PARAMETER;
_level = GNUTLS_AL_FATAL;
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:
ret = GNUTLS_A_BAD_CERTIFICATE;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_UNKNOWN_CIPHER_SUITE:
case GNUTLS_E_UNKNOWN_COMPRESSION_ALGORITHM:
case GNUTLS_E_INSUFFICIENT_CREDENTIALS:
case GNUTLS_E_NO_CIPHER_SUITES:
case GNUTLS_E_NO_COMPRESSION_ALGORITHMS:
case GNUTLS_E_UNSUPPORTED_SIGNATURE_ALGORITHM:
case GNUTLS_E_SAFE_RENEGOTIATION_FAILED:
ret = GNUTLS_A_HANDSHAKE_FAILURE;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_RECEIVED_ILLEGAL_EXTENSION:
ret = GNUTLS_A_UNSUPPORTED_EXTENSION;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_UNEXPECTED_PACKET:
case GNUTLS_E_UNEXPECTED_HANDSHAKE_PACKET:
ret = GNUTLS_A_UNEXPECTED_MESSAGE;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_REHANDSHAKE:
ret = GNUTLS_A_NO_RENEGOTIATION;
_level = GNUTLS_AL_WARNING;
break;
case GNUTLS_E_UNSUPPORTED_VERSION_PACKET:
ret = GNUTLS_A_PROTOCOL_VERSION;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_UNSUPPORTED_CERTIFICATE_TYPE:
ret = GNUTLS_A_UNSUPPORTED_CERTIFICATE;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_UNEXPECTED_PACKET_LENGTH:
ret = GNUTLS_A_RECORD_OVERFLOW;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_INTERNAL_ERROR:
case GNUTLS_E_NO_TEMPORARY_DH_PARAMS:
case GNUTLS_E_NO_TEMPORARY_RSA_PARAMS:
ret = GNUTLS_A_INTERNAL_ERROR;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_OPENPGP_GETKEY_FAILED:
ret = GNUTLS_A_CERTIFICATE_UNOBTAINABLE;
_level = GNUTLS_AL_FATAL;
break;
case GNUTLS_E_DH_PRIME_UNACCEPTABLE:
case GNUTLS_E_NO_CERTIFICATE_FOUND:
ret = GNUTLS_A_INSUFFICIENT_SECURITY;
_level = GNUTLS_AL_FATAL;
break;
default:
ret = GNUTLS_A_INTERNAL_ERROR;
_level = GNUTLS_AL_FATAL;
break;
}
if (level != NULL)
*level = _level;
return ret;
}
/**
* gnutls_alert_send_appropriate - send alert to peer depending on error code
* @session: is a #gnutls_session_t structure.
* @err: is an integer
*
* Sends an alert to the peer depending on the error code returned by
* a gnutls function. This function will call gnutls_error_to_alert()
* to determine the appropriate alert to send.
*
* This function may also return %GNUTLS_E_AGAIN, or
* %GNUTLS_E_INTERRUPTED.
*
* If the return value is %GNUTLS_E_INVALID_REQUEST, then no alert has
* been sent to the peer.
*
* Returns: On success, %GNUTLS_E_SUCCESS (0) is returned, otherwise
* an error code is returned.
*/
int
gnutls_alert_send_appropriate (gnutls_session_t session, int err)
{
int alert;
int level;
alert = gnutls_error_to_alert (err, &level);
if (alert < 0)
{
return alert;
}
return gnutls_alert_send (session, level, alert);
}
/**
* gnutls_alert_get - Returns the last alert number received.
* @session: is a #gnutls_session_t structure.
*
* This function will return 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.
*
* If no alert has been received the returned value is undefined.
*
* Returns: returns the last alert received, a
* #gnutls_alert_description_t value.
**/
gnutls_alert_description_t
gnutls_alert_get (gnutls_session_t session)
{
return session->internals.last_alert;
}
|