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/* client_session.c -- Handles eurephia session in admin clients
*
* GPLv2 only - Copyright (C) 2008 - 2012
* David Sommerseth <dazo@users.sourceforge.net>
*
* This program 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; version 2
* of the License.
*
* This program 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
/**
* @file client_session.c
* @author David Sommerseth <dazo@users.sourceforge.net>
* @date 2008-12-01
*
* @brief Functions for working on eurephiaSESSIONs outside the openvpn plug-in
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <unistd.h>
#include <assert.h>
#include <eurephia_nullsafe.h>
#include <eurephia_context.h>
#include <eurephiadb_session_struct.h>
#include <eurephiadb_session_common.h>
#include <eurephiadb_driver.h>
#include <eurephia_log.h>
#include <randstr.h>
#include <sha512.h>
#include "client_config.h"
/**
* Get a file name to a session file. This file can be found in either EUREPHIADM_SESSION
* environment variable, in the users ~/.eurephia or the directory defined by the EUREPHIA_DIR
* environment variable.
*
* @return Returns a full path to the session file on success, otherwise NULL.
*/
char *get_session_file() {
char *fname = NULL;
fname = get_config_filename("EUREPHIADM_SESSION","/session");
if( fname == NULL ) {
// If even default ~/.eurephia dir failed, create one in /tmp
snprintf(fname, 1024, "/tmp/.eurepia-%i.sess", getuid());
return fname;
}
return fname;
}
/**
* Reads the session key and does a quick validation of it.
*
* @param ctx eurephiaCTX
*
* @return Returns a string (char *) containing the session key on success, otherwise NULL.
*/
char *read_session_file(eurephiaCTX *ctx) {
char *sesskey = NULL, *fname = NULL;
FILE *sfp = NULL;
fname = get_session_file();
assert(fname != NULL);
if( (sfp = fopen(fname, "r")) == NULL ) {
return NULL;
}
sesskey = (char *) malloc_nullsafe(ctx, 256);
assert( sesskey != NULL );
if( (fgets(sesskey, 254, sfp) == NULL) || (strlen_nullsafe(sesskey) < 64) ) {
eurephia_log(ctx, LOG_PANIC, 0,
"Could not read session file (%s). Session value too short", fname);
return NULL;
}
fclose(sfp);
return sesskey;
}
/**
* Writes a session key to disk, to keep session logged in over a longer time.
*
* @param ctx eurephiaCTX
* @param sess eurephiaSESSION with session info for the current logged in user.
*
* @return Returns 1 on success, otherwise 0.
*/
int write_session_file(eurephiaCTX *ctx, eurephiaSESSION *sess) {
struct stat fchk;
char *fname = NULL;
FILE *sfp = NULL;
assert((ctx != NULL) && (sess != NULL) && (sess->sessionkey != NULL));
fname = get_session_file();
assert(fname != NULL);
if( stat(fname, &fchk) != -1 ) {
// session file exists, do not update it
return 1;
}
if( (sfp = fopen(fname, "w")) == NULL ) {
eurephia_log(ctx, LOG_PANIC, 0, "Could not create session file (%s). Operation aborted.", fname);
return 0;
}
fprintf(sfp, "%s", sess->sessionkey);
fclose(sfp);
return 1;
}
/**
* Removes the session file, used when logging out or the user is automatically logged out.
*
* @param ctx eurephiaCTX
*/
void remove_session_file(eurephiaCTX *ctx) {
const char *fname = NULL;
fname = get_session_file();
assert(fname != NULL);
if( unlink(fname) == -1) {
eurephia_log(ctx, LOG_ERROR, 0,
"Could not remove session file (%s). Following operations might fail", fname);
};
}
/**
* Create a eurephiaSESSION. If session key is given, it will try to load that session back.
* If no session key is given, it will create a brand new user session.
*
* @param ctx eurephiaCTX
* @param sesskey session key, used for loading existing sessions back.
*
* @return Returns a eurephiaSESSION pointer to a session, either new or old. On failure, NULL is returned.
*/
eurephiaSESSION *create_session(eurephiaCTX *ctx, const char *sesskey) {
eurephiaSESSION *new_sess = NULL;
int loop = 0, uniqchk = 0;
char *randdata = NULL;
unsigned char sha_res[SHA512_HASH_SIZE+2];
SHA512Context sha;
new_sess = (eurephiaSESSION *) malloc_nullsafe(ctx, sizeof(eurephiaSESSION) + 2);
assert(new_sess != NULL);
if( sesskey == NULL ) {
// Get data for a unique session key
randdata = (char *) malloc_nullsafe(ctx, 514);
assert(randdata != NULL);
do {
char *ptr = NULL;
int i = 0;
if( !eurephia_randstring(ctx, randdata, 512) ) {
eurephia_log(ctx, LOG_FATAL, 0,
"Could not generate enough random data for session");
free_nullsafe(ctx, randdata);
free_nullsafe(ctx, new_sess);
return NULL;
}
memset(&sha, 0, sizeof(SHA512Context));
memset(&sha_res, 0, SHA512_HASH_SIZE+2);
free_nullsafe(ctx, new_sess->sessionkey);
new_sess->sessionkey = (char *) malloc_nullsafe(ctx, (SHA512_HASH_SIZE*2) + 3);
assert(new_sess->sessionkey != NULL);
SHA512Init(&sha);
SHA512Update(&sha, randdata, 512);
SHA512Final(&sha, sha_res);
ptr = new_sess->sessionkey;
for( i = 0; i < SHA512_HASH_SIZE; i++ ) {
sprintf(ptr, "%02x", sha_res[i]);
ptr += 2;
}
memset(&sha, 0, sizeof(SHA512Context));
memset(&sha_res, 0, sizeof(sha_res));
loop++;
uniqchk = eDBcheck_sessionkey_uniqueness(ctx, new_sess->sessionkey);
memset(randdata, 0, 514);
} while( (uniqchk == 0) && (loop < 11) );
free_nullsafe(ctx, randdata);
if( uniqchk == 0 ) {
eurephia_log(ctx, LOG_FATAL, 0,
"Did not manage to create a unique session key after %i attempts."
" Aborting.", loop-1);
free_nullsafe(ctx, new_sess->sessionkey);
free_nullsafe(ctx, new_sess);
return NULL;
}
} else {
new_sess->sessionkey = strdup(sesskey);
new_sess->sessvals = eDBload_sessiondata(ctx, new_sess->sessionkey);
}
// Return new session
return new_sess;
}
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