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MaxScale/server/core/dbusers.c
VilhoRaatikka 7e6cb7afc2 Snapshot of failure tolerance changes. 
Added a lot of logging to error, trace and message logs which should help the user to handle errors which can't be automatically resolved, like attempt to use nonexisting database.
2014-06-06 23:32:04 +03:00

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/*
* This file is distributed as part of the SkySQL Gateway. It 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.
*
* 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.
*
* Copyright SkySQL Ab 2013
*/
/**
* @file dbusers.c - Loading MySQL users from a MySQL backend server, this needs libmysqlclient.so and header files
*
* @verbatim
* Revision History
*
* Date Who Description
* 24/06/2013 Massimiliano Pinto Initial implementation
* 08/08/2013 Massimiliano Pinto Fixed bug for invalid memory access in row[1]+1 when row[1] is ""
* 06/02/2014 Massimiliano Pinto Mysql user root selected based on configuration flag
* 26/02/2014 Massimiliano Pinto Addd: replace_mysql_users() routine may replace users' table based on a checksum
* 28/02/2014 Massimiliano Pinto Added Mysql user@host authentication
*
* @endverbatim
*/
#include <stdio.h>
#include <mysql.h>
#include <dcb.h>
#include <service.h>
#include <users.h>
#include <dbusers.h>
#include <skygw_utils.h>
#include <log_manager.h>
#include <secrets.h>
#include <mysql_client_server_protocol.h>
#define USERS_QUERY_NO_ROOT " AND user NOT IN ('root')"
#define LOAD_MYSQL_USERS_QUERY "SELECT user, host, password, concat(user,host,password) AS userdata FROM mysql.user WHERE user IS NOT NULL AND user <> ''"
#define MYSQL_USERS_COUNT "SELECT COUNT(1) AS nusers FROM mysql.user"
extern int lm_enabled_logfiles_bitmask;
static int getUsers(SERVICE *service, struct users *users);
static int uh_cmpfun( void* v1, void* v2);
static void *uh_keydup(void* key);
static void uh_keyfree( void* key);
static int uh_hfun( void* key);
char *mysql_users_fetch(USERS *users, MYSQL_USER_HOST *key);
char *mysql_format_user_entry(void *data);
/**
* Load the user/passwd form mysql.user table into the service users' hashtable
* environment.
*
* @param service The current service
* @return -1 on any error or the number of users inserted (0 means no users at all)
*/
int
load_mysql_users(SERVICE *service)
{
return getUsers(service, service->users);
}
/**
* Reload the user/passwd form mysql.user table into the service users' hashtable
* environment.
*
* @param service The current service
* @return -1 on any error or the number of users inserted (0 means no users at all)
*/
int
reload_mysql_users(SERVICE *service)
{
int i;
struct users *newusers, *oldusers;
if ((newusers = mysql_users_alloc()) == NULL)
return 0;
i = getUsers(service, newusers);
spinlock_acquire(&service->spin);
oldusers = service->users;
service->users = newusers;
spinlock_release(&service->spin);
users_free(oldusers);
return i;
}
/**
* Replace the user/passwd form mysql.user table into the service users' hashtable
* environment.
* The replacement is succesful only if the users' table checksums differ
*
* @param service The current service
* @return -1 on any error or the number of users inserted (0 means no users at all)
*/
int
replace_mysql_users(SERVICE *service)
{
int i;
struct users *newusers, *oldusers;
if ((newusers = mysql_users_alloc()) == NULL)
return -1;
i = getUsers(service, newusers);
if (i <= 0)
return i;
spinlock_acquire(&service->spin);
oldusers = service->users;
/* digest compare */
if (memcmp(oldusers->cksum, newusers->cksum, SHA_DIGEST_LENGTH) == 0) {
/* same data, nothing to do */
LOGIF(LD, (skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [replace_mysql_users] users' tables not switched, checksum is the same",
pthread_self())));
/* free the new table */
users_free(newusers);
i = 0;
} else {
/* replace the service with effective new data */
LOGIF(LD, (skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [replace_mysql_users] users' tables replaced, checksum differs",
pthread_self())));
service->users = newusers;
}
spinlock_release(&service->spin);
if (i)
users_free(oldusers);
return i;
}
/**
* Load the user/passwd form mysql.user table into the service users' hashtable
* environment.
*
* @param service The current service
* @param users The users table into which to load the users
* @return -1 on any error or the number of users inserted (0 means no users at all)
*/
static int
getUsers(SERVICE *service, struct users *users)
{
MYSQL *con = NULL;
MYSQL_ROW row;
MYSQL_RES *result = NULL;
int num_fields = 0;
char *service_user = NULL;
char *service_passwd = NULL;
char *dpwd;
int total_users = 0;
SERVER *server;
char *users_query;
unsigned char hash[SHA_DIGEST_LENGTH]="";
char *users_data = NULL;
int nusers = 0;
int users_data_row_len = MYSQL_USER_MAXLEN + MYSQL_HOST_MAXLEN + MYSQL_PASSWORD_LEN;
struct sockaddr_in serv_addr;
MYSQL_USER_HOST key;
/* enable_root for MySQL protocol module means load the root user credentials from backend databases */
if(service->enable_root) {
users_query = LOAD_MYSQL_USERS_QUERY " ORDER BY HOST DESC";
} else {
users_query = LOAD_MYSQL_USERS_QUERY USERS_QUERY_NO_ROOT " ORDER BY HOST DESC";
}
serviceGetUser(service, &service_user, &service_passwd);
if (service_user == NULL || service_passwd == NULL)
return -1;
/** multi-thread environment requires that thread init succeeds. */
if (mysql_thread_init()) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : mysql_thread_init failed.")));
return -1;
}
con = mysql_init(NULL);
if (con == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : mysql_init: %s",
mysql_error(con))));
return -1;
}
if (mysql_options(con, MYSQL_OPT_USE_REMOTE_CONNECTION, NULL)) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : failed to set external connection. "
"It is needed for backend server connections. "
"Exiting.")));
return -1;
}
/**
* Attempt to connect to one of the databases database or until we run
* out of databases
* to try
*/
server = service->databases;
dpwd = decryptPassword(service_passwd);
while (server != NULL && (mysql_real_connect(con,
server->name,
service_user,
dpwd,
NULL,
server->port,
NULL,
0) == NULL))
{
server = server->nextdb;
}
free(dpwd);
if (server == NULL)
{
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Unable to get user data from backend database "
"for service %s. Missing server information.",
service->name)));
mysql_close(con);
return -1;
}
if (mysql_query(con, MYSQL_USERS_COUNT)) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading users for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
mysql_close(con);
return -1;
}
result = mysql_store_result(con);
if (result == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading users for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
mysql_close(con);
return -1;
}
num_fields = mysql_num_fields(result);
row = mysql_fetch_row(result);
nusers = atoi(row[0]);
mysql_free_result(result);
if (!nusers) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Counting users for service %s returned 0",
service->name)));
mysql_close(con);
return -1;
}
if (mysql_query(con, users_query)) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading users for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
mysql_close(con);
return -1;
}
result = mysql_store_result(con);
if (result == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading users for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
mysql_close(con);
return -1;
}
num_fields = mysql_num_fields(result);
users_data = (char *)calloc(nusers, (users_data_row_len * sizeof(char)) + 1);
if(users_data == NULL)
return -1;
while ((row = mysql_fetch_row(result))) {
/**
* Four fields should be returned.
* user and passwd+1 (escaping the first byte that is '*') are
* added to hashtable.
*/
char ret_ip[INET_ADDRSTRLEN + 1]="";
const char *rc;
/* prepare the user@host data struct */
memset(&serv_addr, 0, sizeof(serv_addr));
memset(&key, 0, sizeof(key));
/* if host == '%', 0 is passed */
if (setipaddress(&serv_addr.sin_addr, strcmp(row[1], "%") ? row[1] : "0.0.0.0")) {
key.user = strdup(row[0]);
if(key.user == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [getUsers()] strdup() failed for user %s",
pthread_self(),
row[0])));
continue;
}
memcpy(&key.ipv4, &serv_addr, sizeof(serv_addr));
rc = inet_ntop(AF_INET, &(serv_addr).sin_addr, ret_ip, INET_ADDRSTRLEN);
/* add user@host as key and passwd as value in the MySQL users hash table */
if (mysql_users_add(users, &key, strlen(row[2]) ? row[2]+1 : row[2])) {
LOGIF(LD, (skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [mysql_users_add()] Added user %s@%s(%s)",
pthread_self(),
row[0],
row[1],
rc == NULL ? "NULL" : ret_ip)));
/* Append data in the memory area for SHA1 digest */
strncat(users_data, row[3], users_data_row_len);
total_users++;
} else {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [mysql_users_add()] Failed adding user %s@%s(%s)",
pthread_self(),
row[0],
row[1],
rc == NULL ? "NULL" : ret_ip)));
continue;
}
} else {
/* setipaddress() failed, skip user add and log this*/
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"%lu [getUsers()] setipaddress failed: user %s@%s not added",
pthread_self(),
row[0],
row[1])));
}
}
/* compute SHA1 digest for users' data */
SHA1((const unsigned char *) users_data, strlen(users_data), hash);
memcpy(users->cksum, hash, SHA_DIGEST_LENGTH);
free(users_data);
mysql_free_result(result);
mysql_close(con);
mysql_thread_end();
return total_users;
}
/**
* Allocate a new MySQL users table for mysql specific users@host as key
*
* @return The users table
*/
USERS *
mysql_users_alloc()
{
USERS *rval;
if ((rval = calloc(1, sizeof(USERS))) == NULL)
return NULL;
if ((rval->data = hashtable_alloc(USERS_HASHTABLE_DEFAULT_SIZE, uh_hfun, uh_cmpfun)) == NULL) {
free(rval);
return NULL;
}
/* set the MySQL user@host print routine for the debug interface */
rval->usersCustomUserFormat = mysql_format_user_entry;
/* the key is handled by uh_keydup/uh_keyfree.
* the value is a (char *): it's handled by strdup/free
*/
hashtable_memory_fns(rval->data, (HASHMEMORYFN)uh_keydup, (HASHMEMORYFN) strdup, (HASHMEMORYFN)uh_keyfree, (HASHMEMORYFN)free);
return rval;
}
/**
* Add a new MySQL user to the user table. The user name must be unique
*
* @param users The users table
* @param user The user name
* @param auth The authentication data
* @return The number of users added to the table
*/
int
mysql_users_add(USERS *users, MYSQL_USER_HOST *key, char *auth)
{
int add;
if (key == NULL || key->user == NULL)
return 0;
atomic_add(&users->stats.n_adds, 1);
add = hashtable_add(users->data, key, auth);
atomic_add(&users->stats.n_entries, add);
return add;
}
/**
* Fetch the authentication data for a particular user from the users table
*
* @param users The MySQL users table
* @param key The key with user@host
* @return The authentication data or NULL on error
*/
char *mysql_users_fetch(USERS *users, MYSQL_USER_HOST *key) {
if (key == NULL)
return NULL;
atomic_add(&users->stats.n_fetches, 1);
return hashtable_fetch(users->data, key);
}
/**
* The hash function we use for storing MySQL users as: users@hosts.
* Currently only IPv4 addresses are supported
*
* @param key The key value, i.e. username@host (IPv4)
* @return The hash key
*/
static int uh_hfun( void* key) {
MYSQL_USER_HOST *hu = (MYSQL_USER_HOST *) key;
if (key == NULL || hu == NULL || hu->user == NULL) {
return 0;
} else {
return (*hu->user + *(hu->user + 1) + (unsigned int) (hu->ipv4.sin_addr.s_addr & 0xFF000000 / (256 * 256 * 256)));
}
}
/**
* The compare function we use for compare MySQL users as: users@hosts.
* Currently only IPv4 addresses are supported
*
* @param key1 The key value, i.e. username@host (IPv4)
* @param key1 The key value, i.e. username@host (IPv4)
* @return The compare value
*/
static int uh_cmpfun( void* v1, void* v2) {
MYSQL_USER_HOST *hu1 = (MYSQL_USER_HOST *) v1;
MYSQL_USER_HOST *hu2 = (MYSQL_USER_HOST *) v2;
if (v1 == NULL || v2 == NULL || hu1 == NULL || hu2 == NULL || hu1->user == NULL || hu2->user == NULL)
return 0;
if (strcmp(hu1->user, hu2->user) == 0 && (hu1->ipv4.sin_addr.s_addr == hu2->ipv4.sin_addr.s_addr)) {
return 0;
} else {
return 1;
}
}
/**
*The key dup function we use for duplicate the users@hosts.
*
* @param key The key value, i.e. username@host ip4/ip6 data
*/
static void *uh_keydup(void* key) {
MYSQL_USER_HOST *rval = (MYSQL_USER_HOST *) calloc(1, sizeof(MYSQL_USER_HOST));
MYSQL_USER_HOST *current_key = (MYSQL_USER_HOST *)key;
if (key == NULL || rval == NULL || current_key == NULL || current_key->user == NULL) {
return NULL;
}
rval->user = strdup(current_key->user);
if (rval->user == NULL)
return NULL;
memcpy(&rval->ipv4, &current_key->ipv4, sizeof(struct sockaddr_in));
return (void *) rval;
}
/**
* The key free function we use for freeing the users@hosts data
*
* @param key The key value, i.e. username@host ip4 data
*/
static void uh_keyfree( void* key) {
MYSQL_USER_HOST *current_key = (MYSQL_USER_HOST *)key;
if (key == NULL)
return;
if (current_key && current_key->user)
free(current_key->user);
free(key);
}
/**
* Format the mysql user as user@host
* The returned memory must be freed by the caller
*
* @param data Input data
* @return the MySQL user@host
*/
char *mysql_format_user_entry(void *data)
{
MYSQL_USER_HOST *entry;
char *mysql_user;
/* the returned user string is "USER" + "@" + "HOST" + '\0' */
int mysql_user_len = MYSQL_USER_MAXLEN + 1 + INET_ADDRSTRLEN + 1;
if (data == NULL)
return NULL;
entry = (MYSQL_USER_HOST *) data;
if (entry == NULL)
return NULL;
mysql_user = (char *) calloc(mysql_user_len, sizeof(char));
if (mysql_user == NULL)
return NULL;
if (entry->ipv4.sin_addr.s_addr == INADDR_ANY) {
snprintf(mysql_user, mysql_user_len, "%s@%%", entry->user);
} else {
strncpy(mysql_user, entry->user, MYSQL_USER_MAXLEN);
strcat(mysql_user, "@");
inet_ntop(AF_INET, &(entry->ipv4).sin_addr, mysql_user+strlen(mysql_user), INET_ADDRSTRLEN);
}
return mysql_user;
}
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