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49d28bc1f3f47881459731b8172076d409173517
MaxScale/server/core/dbusers.c
VilhoRaatikka 665315ea5c Fix to bug #612, http://bugs.mariadb.com/show_bug.cgi?id=612 
Also added error logging in cases where memory allocation failed etc.
2014-11-05 22:04:36 +02:00

1067 lines
29 KiB
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/*
* This file is distributed as part of the MariaDB Corporation MaxScale. 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 MariaDB Corporation Ab 2013-2014
*/
/**
* @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
* 29/09/2014 Massimiliano Pinto Added Mysql user@host authentication with wildcard in IPv4 hosts:
* x.y.z.%, x.y.%.%, x.%.%.%
* 03/10/14 Massimiliano Pinto Added netmask to user@host authentication for wildcard in IPv4 hosts
* 13/10/14 Massimiliano Pinto Added (user@host)@db 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>
#include <mysqld_error.h>
#define USERS_QUERY_NO_ROOT " AND user NOT IN ('root')"
#define LOAD_MYSQL_USERS_QUERY "SELECT user, host, password, concat(user,host,password,Select_priv) AS userdata, Select_priv AS anydb FROM mysql.user WHERE user IS NOT NULL AND user <> ''"
#define MYSQL_USERS_COUNT "SELECT COUNT(1) AS nusers FROM mysql.user"
#define MYSQL_USERS_WITH_DB_ORDER " ORDER BY host DESC"
#define LOAD_MYSQL_USERS_WITH_DB_QUERY "SELECT user.user AS user,user.host AS host,user.password AS password,concat(user.user,user.host,user.password,user.Select_priv,IFNULL(db,'')) AS userdata, user.Select_priv AS anydb,db.db AS db FROM mysql.user LEFT JOIN mysql.db ON user.user=db.user AND user.host=db.host WHERE user.user IS NOT NULL AND user.user <> ''" MYSQL_USERS_WITH_DB_ORDER
#define MYSQL_USERS_WITH_DB_COUNT "SELECT COUNT(1) AS nusers_db FROM (" LOAD_MYSQL_USERS_WITH_DB_QUERY ") AS tbl_count"
#define LOAD_MYSQL_USERS_WITH_DB_QUERY_NO_ROOT "SELECT * FROM (" LOAD_MYSQL_USERS_WITH_DB_QUERY ") AS t1 WHERE user NOT IN ('root')" MYSQL_USERS_WITH_DB_ORDER
#define LOAD_MYSQL_DATABASE_NAMES "SELECT * FROM ( (SELECT COUNT(1) AS ndbs FROM INFORMATION_SCHEMA.SCHEMATA) AS tbl1, (SELECT GRANTEE,PRIVILEGE_TYPE from INFORMATION_SCHEMA.USER_PRIVILEGES WHERE privilege_type='SHOW DATABASES' AND REPLACE(GRANTEE, \"\'\",\"\")=CURRENT_USER()) AS tbl2)"
extern int lm_enabled_logfiles_bitmask;
static int getUsers(SERVICE *service, 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);
int add_mysql_users_with_host_ipv4(USERS *users, char *user, char *host, char *passwd, char *anydb, char *db);
static int getDatabases(SERVICE *, MYSQL *);
HASHTABLE *resource_alloc();
void resource_free(HASHTABLE *resource);
void *resource_fetch(HASHTABLE *, char *);
int resource_add(HASHTABLE *, char *, char *);
int resource_hash(char *);
/**
* 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;
USERS *newusers, *oldusers;
HASHTABLE *oldresources;
if ((newusers = mysql_users_alloc()) == NULL)
return 0;
oldresources = service->resources;
i = getUsers(service, newusers);
spinlock_acquire(&service->spin);
oldusers = service->users;
service->users = newusers;
spinlock_release(&service->spin);
/* free the old table */
users_free(oldusers);
/* free old resources */
resource_free(oldresources);
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;
USERS *newusers, *oldusers;
HASHTABLE *oldresources;
if ((newusers = mysql_users_alloc()) == NULL)
return -1;
oldresources = service->resources;
/* load db users ad db grants */
i = getUsers(service, newusers);
if (i <= 0) {
users_free(newusers);
/* restore resources */
service->resources = oldresources;
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;
}
/* free old resources */
resource_free(oldresources);
spinlock_release(&service->spin);
if (i) {
/* free the old table */
users_free(oldusers);
}
return i;
}
/**
* Add a new MySQL user with host, password and netmask into the service users table
*
* The netmask values are:
* 0 for any, 32 for single IPv4
* 24 for a class C from a.b.c.%, 16 for a Class B from a.b.%.% and 8 for a Class A from a.%.%.%
*
* @param users The users table
* @param user The user name
* @param host The host to add, with possible wildcards
* @param passwd The sha1(sha1(passoword)) to add
* @return 1 on success, 0 on failure
*/
int add_mysql_users_with_host_ipv4(USERS *users, char *user, char *host, char *passwd, char *anydb, char *db) {
struct sockaddr_in serv_addr;
MYSQL_USER_HOST key;
char ret_ip[INET_ADDRSTRLEN + 1]="";
int found_range=0;
int found_any=0;
int ret = 0;
if (users == NULL || user == NULL || host == NULL) {
return ret;
}
/* prepare the user@host data struct */
memset(&serv_addr, 0, sizeof(serv_addr));
memset(&key, '\0', sizeof(key));
/* set user */
key.user = strdup(user);
if(key.user == NULL) {
return ret;
}
/* for anydb == Y key.resource is '\0' as set by memset */
if (anydb == NULL) {
key.resource = NULL;
} else {
if (strcmp(anydb, "N") == 0) {
if (db != NULL)
key.resource = strdup(db);
else
key.resource = NULL;
} else {
key.resource = strdup("");
}
}
/* handle ANY, Class C,B,A */
/* ANY */
if (strcmp(host, "%") == 0) {
strcpy(ret_ip, "0.0.0.0");
found_any = 1;
} else {
char *tmp;
strncpy(ret_ip, host, INET_ADDRSTRLEN);
tmp = ret_ip+strlen(ret_ip)-1;
/* start from Class C */
while(tmp > ret_ip) {
if (*tmp == '%') {
/* set only the last IPv4 byte to 1
* avoiding setipadress() failure
* for Class C address
*/
found_range++;
if (found_range == 1)
*tmp = '1';
else
*tmp = '0';
}
tmp--;
}
}
/* fill IPv4 data struct */
if (setipaddress(&serv_addr.sin_addr, ret_ip)) {
/* copy IPv4 data into key.ipv4 */
memcpy(&key.ipv4, &serv_addr, sizeof(serv_addr));
if (found_range) {
/* let's zero the last IP byte: a.b.c.0 we set above to 1*/
key.ipv4.sin_addr.s_addr &= 0x00FFFFFF;
key.netmask = 32 - (found_range * 8);
} else {
key.netmask = 32 - (found_any * 32);
}
/* add user@host as key and passwd as value in the MySQL users hash table */
if (mysql_users_add(users, &key, passwd)) {
ret = 1;
}
}
free(key.user);
if (key.resource)
free(key.resource);
return ret;
}
/**
* Load the database specific grants from mysql.db table into the service resources 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
getDatabases(SERVICE *service, MYSQL *con)
{
MYSQL_ROW row;
MYSQL_RES *result = NULL;
char *service_user = NULL;
char *service_passwd = NULL;
int ndbs = 0;
char *get_showdbs_priv_query = LOAD_MYSQL_DATABASE_NAMES;
serviceGetUser(service, &service_user, &service_passwd);
if (service_user == NULL || service_passwd == NULL)
return -1;
if (mysql_query(con, get_showdbs_priv_query)) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading database names for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
return -1;
}
result = mysql_store_result(con);
if (result == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading database names for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
return -1;
}
/* Result has only one row */
row = mysql_fetch_row(result);
if (row) {
ndbs = atoi(row[0]);
} else {
ndbs = 0;
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Warning: Loading DB names for service [%s] returned 0 rows."
" SHOW DATABASES grant to user [%s] is required for MaxScale DB Name Authentication",
service->name,
service_user)));
}
/* free resut set */
mysql_free_result(result);
if (!ndbs) {
/* return if no db names are available */
return 0;
}
if (mysql_query(con, "SHOW DATABASES")) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading database names for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
return -1;
}
result = mysql_store_result(con);
if (result == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading database names for service %s encountered "
"error: %s.",
service->name,
mysql_error(con))));
return -1;
}
/* Now populate service->resources hashatable with db names */
service->resources = resource_alloc();
/* insert key and value "" */
while ((row = mysql_fetch_row(result))) {
resource_add(service->resources, row[0], "");
}
mysql_free_result(result);
return ndbs;
}
/**
* 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, USERS *users)
{
MYSQL *con = NULL;
MYSQL_ROW row;
MYSQL_RES *result = NULL;
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 + sizeof(char) + MYSQL_DATABASE_MAXLEN;
int dbnames = 0;
int db_grants = 0;
serviceGetUser(service, &service_user, &service_passwd);
if (service_user == NULL || service_passwd == NULL)
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;
}
/* count users */
/* start with users and db grants for users */
if (mysql_query(con, MYSQL_USERS_WITH_DB_COUNT)) {
if (mysql_errno(con) != ER_TABLEACCESS_DENIED_ERROR) {
/* This is an error we cannot handle, return */
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;
} else {
/*
* We have got ER_TABLEACCESS_DENIED_ERROR
* try counting users from mysql.user without DB names.
*/
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;
}
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(service->enable_root) {
/* enable_root for MySQL protocol module means load the root user credentials from backend databases */
users_query = LOAD_MYSQL_USERS_WITH_DB_QUERY;
} else {
users_query = LOAD_MYSQL_USERS_WITH_DB_QUERY_NO_ROOT;
}
/* send first the query that fetches users and db grants */
if (mysql_query(con, users_query)) {
/*
* An error occurred executing the query
*
* Check mysql_errno() against ER_TABLEACCESS_DENIED_ERROR)
*/
if (1142 != mysql_errno(con)) {
/* This is an error we cannot handle, return */
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading users with dbnames for service [%s] encountered "
"error: [%s], MySQL errno %i",
service->name,
mysql_error(con),
mysql_errno(con))));
mysql_close(con);
return -1;
} else {
/*
* We have got ER_TABLEACCESS_DENIED_ERROR
* try loading users from mysql.user without DB names.
*/
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error: Loading DB grants failed: GRANT is required on [mysql.db] to user [%s]. Try loading DB users for service [%s] without DB name MaxScale Authentication", service_user, service->name)));
/* check for root user select */
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";
}
if (mysql_query(con, users_query)) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Loading users for service [%s] encountered "
"error: [%s], code %i",
service->name,
mysql_error(con),
mysql_errno(con))));
mysql_close(con);
return -1;
}
/* users successfully loaded but without db grants */
LOGIF(LM, (skygw_log_write_flush(
LOGFILE_MESSAGE,
"Loading users from [mysql.user] without DB grants from [mysql.db] for service [%s]."
" MaxScale Authentication with DBname on connect will not work",
service->name)));
}
} else {
/*
* users successfully loaded with db grants.
*/
db_grants = 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_free_result(result);
mysql_close(con);
return -1;
}
users_data = (char *)calloc(nusers, (users_data_row_len * sizeof(char)) + 1);
if (users_data == NULL) {
LOGIF(LE, (skygw_log_write_flush(
LOGFILE_ERROR,
"Error : Memory allocation for user data failed due to "
"%d, %s.",
errno,
strerror(errno))));
mysql_free_result(result);
mysql_close(con);
return -1;
}
if (db_grants) {
/* load all mysql database names */
dbnames = getDatabases(service, con);
LOGIF(LM, (skygw_log_write(
LOGFILE_MESSAGE,
"Loaded %d MySQL Database Names for service [%s]",
dbnames,
service->name)));
} else {
service->resources = NULL;
}
while ((row = mysql_fetch_row(result))) {
/**
* Up to six fields could be returned.
* user,host,passwd,concat(),anydb,db
* passwd+1 (escaping the first byte that is '*')
*/
int rc = 0;
char *password = NULL;
if (row[2] != NULL) {
if (strlen(row[2]) > 1)
password = row[2] +1;
else
password = row[2];
}
/*
* add user@host and DB global priv and specificsa grant (if possible)
*/
if (db_grants) {
/* we have dbgrants, store them */
rc = add_mysql_users_with_host_ipv4(users, row[0], row[1], password, row[4], row[5]);
} else {
/* we don't have dbgrants, simply set ANY DB for the user */
rc = add_mysql_users_with_host_ipv4(users, row[0], row[1], password, "Y", NULL);
}
if (rc == 1) {
if (db_grants) {
char dbgrant[MYSQL_DATABASE_MAXLEN + 1]="";
if (row[4] != NULL) {
if (strcmp(row[4], "Y"))
strcpy(dbgrant, "ANY");
else {
if (row[5])
strncpy(dbgrant, row[5], MYSQL_DATABASE_MAXLEN);
}
}
if (!strlen(dbgrant))
strcpy(dbgrant, "no db");
/* Log the user being added with its db grants */
LOGIF(LD, (skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [mysql_users_add()] Added user %s@%s with DB grants on [%s]",
pthread_self(),
row[0],
row[1],
dbgrant)));
} else {
/* Log the user being added (without db grants) */
LOGIF(LD, (skygw_log_write_flush(
LOGFILE_DEBUG,
"%lu [mysql_users_add()] Added user %s@%s",
pthread_self(),
row[0],
row[1])));
}
/* 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 for service [%s]",
pthread_self(),
row[0],
row[1],
service->name)));
}
}
/* 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);
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 key2 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)
return 0;
if (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) && (hu1->netmask >= hu2->netmask)) {
/* if no database name was passed, auth is ok */
if (hu1->resource == NULL || (hu1->resource && !strlen(hu1->resource))) {
return 0;
} else {
/* (1) check for no database grants at all and deny auth */
if (hu2->resource == NULL) {
return 1;
}
/* (2) check for ANY database grant and allow auth */
if (!strlen(hu2->resource)) {
return 0;
}
/* (3) check for database name specific grant and allow auth */
if (hu1->resource && hu2->resource && strcmp(hu1->resource,hu2->resource) == 0) {
return 0;
}
/* no matches, deny auth */
return 1;
}
} 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) {
if (rval) {
free(rval);
}
return NULL;
}
rval->user = strdup(current_key->user);
if (rval->user == NULL) {
free(rval);
return NULL;
}
memcpy(&rval->ipv4, &current_key->ipv4, sizeof(struct sockaddr_in));
memcpy(&rval->netmask, &current_key->netmask, sizeof(int));
if (current_key->resource)
rval->resource = strdup(current_key->resource);
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);
if (current_key && current_key->resource)
free(current_key->resource);
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 + 10 + MYSQL_USER_MAXLEN + 1;
if (data == NULL)
return NULL;
entry = (MYSQL_USER_HOST *) data;
mysql_user = (char *) calloc(mysql_user_len, sizeof(char));
if (mysql_user == NULL)
return NULL;
/* format user@host based on wildcards */
if (entry->ipv4.sin_addr.s_addr == INADDR_ANY && entry->netmask == 0) {
snprintf(mysql_user, mysql_user_len-1, "%s@%%", entry->user);
} else if ( (entry->ipv4.sin_addr.s_addr & 0xFF000000) == 0 && entry->netmask == 24) {
snprintf(mysql_user, mysql_user_len-1, "%s@%i.%i.%i.%%", entry->user, entry->ipv4.sin_addr.s_addr & 0x000000FF, (entry->ipv4.sin_addr.s_addr & 0x0000FF00) / (256), (entry->ipv4.sin_addr.s_addr & 0x00FF0000) / (256 * 256));
} else if ( (entry->ipv4.sin_addr.s_addr & 0xFFFF0000) == 0 && entry->netmask == 16) {
snprintf(mysql_user, mysql_user_len-1, "%s@%i.%i.%%.%%", entry->user, entry->ipv4.sin_addr.s_addr & 0x000000FF, (entry->ipv4.sin_addr.s_addr & 0x0000FF00) / (256));
} else if ( (entry->ipv4.sin_addr.s_addr & 0xFFFFFF00) == 0 && entry->netmask == 8) {
snprintf(mysql_user, mysql_user_len-1, "%s@%i.%%.%%.%%", entry->user, entry->ipv4.sin_addr.s_addr & 0x000000FF);
} else if (entry->netmask == 32) {
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);
} else {
snprintf(mysql_user, MYSQL_USER_MAXLEN-5, "Err: %s", entry->user);
strcat(mysql_user, "@");
inet_ntop(AF_INET, &(entry->ipv4).sin_addr, mysql_user+strlen(mysql_user), INET_ADDRSTRLEN);
}
return mysql_user;
}
/*
* The hash function we use for storing MySQL database names.
*
* @param key The key value
* @return The hash key
*/
int
resource_hash(char *key)
{
return (*key + *(key + 1));
}
/**
* Remove the resources table
*
* @param resources The resources table to remove
*/
void
resource_free(HASHTABLE *resources)
{
if (resources) {
hashtable_free(resources);
}
}
/**
* Allocate a MySQL database names table
*
* @return The database names table
*/
HASHTABLE *
resource_alloc()
{
HASHTABLE *resources;
if ((resources = hashtable_alloc(10, resource_hash, strcmp)) == NULL)
{
return NULL;
}
hashtable_memory_fns(resources, (HASHMEMORYFN)strdup, (HASHMEMORYFN)strdup, (HASHMEMORYFN)free, (HASHMEMORYFN)free);
return resources;
}
/**
* Add a new MySQL database name to the resources table. The resource name must be unique
*
* @param resources The resources table
* @param key The resource name
* @param value The value for resource (not used)
* @return The number of resources dded to the table
*/
int
resource_add(HASHTABLE *resources, char *key, char *value)
{
return hashtable_add(resources, key, value);
}
/**
* Fetch a particular database name from the resources table
*
* @param resources The MySQL database names table
* @param key The database name to fetch
* @return The database esists or NULL if not found
*/
void *
resource_fetch(HASHTABLE *resources, char *key)
{
return hashtable_fetch(resources, key);
}
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