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/*
* Copyright (C) 2001 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_auth.h"
#include "gnutls_auth_int.h"
#include "gnutls_algorithms.h"
#include "auth_anon.h"
/* The functions here are used in order for authentication algorithms
* to be able to retrieve the needed credentials eg public and private
* key etc.
*/
/* This clears the whole linked list */
int gnutls_clear_creds( GNUTLS_STATE state) {
AUTH_CRED * ccred, *ncred;
if (state->gnutls_key->cred!=NULL) { /* begining of the list */
ccred = state->gnutls_key->cred;
while(ccred!=NULL) {
ncred = ccred->next;
if (ccred!=NULL) gnutls_free(ccred);
ccred = ncred;
}
state->gnutls_key->cred = NULL;
}
return 0;
}
/*
* This creates a linked list of the form:
* { algorithm, credentials, pointer to next }
*/
/**
* gnutls_set_cred - Sets the needed credentials for the specified authentication algorithm.
* @state: is a &GNUTLS_STATE structure.
* @type: is the type of the credentials
* @cred: is a pointer to a structure.
*
* Sets the needed credentials for the specified type.
* Eg username, password - or public and private keys etc.
* The (void* cred) parameter is a structure that depends on the
* specified type and on the current state (client or server).
* [ In order to minimize memory usage, and share credentials between
* several threads gnutls keeps a pointer to cred, and not the whole cred
* structure. Thus you will have to keep the structure allocated until
* you call gnutls_deinit(). ]
*
* For %GNUTLS_ANON cred should be NULL in case of a client.
* In case of a server it should be &ANON_SERVER_CREDENTIALS.
*
* For %GNUTLS_SRP cred should be &SRP_CLIENT_CREDENTIALS
* in case of a client, and &SRP_SERVER_CREDENTIALS, in case
* of a server.
**/
int gnutls_set_cred( GNUTLS_STATE state, CredType type, void* cred) {
AUTH_CRED * ccred, *pcred;
int exists=0;
if (state->gnutls_key->cred==NULL) { /* begining of the list */
state->gnutls_key->cred = gnutls_malloc(sizeof(AUTH_CRED));
if (state->gnutls_key->cred == NULL) return GNUTLS_E_MEMORY_ERROR;
/* copy credentials localy */
state->gnutls_key->cred->credentials = cred;
state->gnutls_key->cred->next = NULL;
state->gnutls_key->cred->algorithm = type;
} else {
ccred = state->gnutls_key->cred;
while(ccred!=NULL) {
if (ccred->algorithm==type) {
exists=1;
break;
}
pcred = ccred;
ccred = ccred->next;
}
if (exists==0) { /* new entry */
pcred->next = gnutls_malloc(sizeof(AUTH_CRED));
if (pcred->next == NULL) return GNUTLS_E_MEMORY_ERROR;
ccred = pcred->next;
/* copy credentials localy */
ccred->credentials = cred;
ccred->next = NULL;
ccred->algorithm = type;
} else { /* modify existing entry */
gnutls_free(ccred->credentials);
ccred->credentials = cred;
}
}
return 0;
}
/**
* gnutls_get_auth_info_type - Returns the type of credentials for the current authentication schema.
* @state: is a &GNUTLS_STATE structure.
*
* Returns type of credentials for the current authentication schema.
* The returned information can be used to distinguish the appropriate structures
* for the gnutls_get_auth_info() function.
* Eg. if this function returns GNUTLS_X509PKI then the return type
* of gnutls_get_auth_info() will be X509PKI_(SERVER/CLIENT)_AUTH_INFO
* (depends on the side - client/server)
**/
CredType gnutls_get_auth_info_type( GNUTLS_STATE state) {
return _gnutls_map_kx_get_cred(
state->security_parameters.kx_algorithm);
}
/*
* This returns an pointer to the linked list. Don't
* free that!!!
*/
const void *_gnutls_get_kx_cred( GNUTLS_KEY key, KXAlgorithm algo, int *err) {
return _gnutls_get_cred( key, _gnutls_map_kx_get_cred(algo), err);
}
const void *_gnutls_get_cred( GNUTLS_KEY key, CredType type, int *err) {
AUTH_CRED * ccred;
ccred = key->cred;
while(ccred!=NULL) {
if (ccred->algorithm==type) {
break;
}
ccred = ccred->next;
}
if (ccred==NULL) {
if (err!=NULL) *err=-1;
return NULL;
}
if (err!=NULL) *err=0;
return ccred->credentials;
}
/**
* gnutls_get_auth_info - Returns a pointer to authentication information.
* @state: is a &GNUTLS_STATE structure.
*
* This function must be called after a succesful gnutls_handshake().
* Returns a pointer to authentication information. That information
* is data obtained by the handshake protocol, the key exchange algorithm,
* and the TLS extensions messages.
*
* In case of %GNUTLS_ANON returns a pointer to &ANON_(SERVER/CLIENT)_AUTH_INFO;
* In case of %GNUTLS_X509PKI returns a pointer to structure &X509PKI_(SERVER/CLIENT)_AUTH_INFO;
* In case of %GNUTLS_SRP returns a pointer to structure &SRP_(SERVER/CLIENT)_AUTH_INFO;
**/
const void* gnutls_get_auth_info( GNUTLS_STATE state) {
return state->gnutls_key->auth_info;
}
/**
* gnutls_x509_set_cn - Used to set the CN for X509 authentication
* @state: is a &GNUTLS_STATE structure.
* @cn: is a null terminated string that contains the peer's CN.
*
* This function is to be used by clients that want to verify
* also the peer's Common Name (ie. the certificate may be verified,
* but it may have been issued for someone else).
**/
int gnutls_x509_set_cn( GNUTLS_STATE state, const char* cn) {
if (strlen( cn) >= X509_CN_SIZE) return GNUTLS_E_MEMORY_ERROR;
strcpy( state->gnutls_key->x509_cn, cn);
return 0;
}
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