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sql_acl.cc
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sql_acl.cc
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/* Copyright (c) 2000, 2018, Oracle and/or its affiliates.
Copyright (c) 2009, 2023, MariaDB
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 02110-1335 USA */
/*
The privileges are saved in the following tables:
mysql/user ; super user who are allowed to do almost anything
mysql/host ; host privileges. This is used if host is empty in mysql/db.
mysql/db ; database privileges / user
data in tables is sorted according to how many not-wild-cards there is
in the relevant fields. Empty strings comes last.
*/
#include "mariadb.h" /* NO_EMBEDDED_ACCESS_CHECKS */
#include "sql_priv.h"
#include "sql_acl.h" // MYSQL_DB_FIELD_COUNT, ACL_ACCESS
#include "sql_base.h" // close_mysql_tables
#include "key.h" // key_copy, key_cmp_if_same, key_restore
#include "sql_show.h" // append_identifier
#include "sql_table.h" // write_bin_log
#include "hash_filo.h"
#include "sql_parse.h" // check_access
#include "sql_view.h" // VIEW_ANY_ACL
#include "records.h" // READ_RECORD, read_record_info,
// init_read_record, end_read_record
#include "rpl_filter.h" // rpl_filter
#include "rpl_rli.h"
#include <m_ctype.h>
#include <stdarg.h>
#include "sp_head.h"
#include "sp.h"
#include "transaction.h"
#include "lock.h" // MYSQL_LOCK_IGNORE_TIMEOUT
#include <sql_common.h>
#include <mysql/plugin_auth.h>
#include <mysql/plugin_password_validation.h>
#include "sql_connect.h"
#include "hostname.h"
#include "sql_db.h"
#include "sql_array.h"
#include "sql_hset.h"
#include "password.h"
#include "sql_plugin_compat.h"
#include "wsrep_mysqld.h"
#define MAX_SCRAMBLE_LENGTH 1024
bool mysql_user_table_is_in_short_password_format= false;
bool using_global_priv_table= true;
// set that from field length in acl_load?
#ifndef NO_EMBEDDED_ACCESS_CHECKS
const uint max_hostname_length= HOSTNAME_LENGTH;
const uint max_dbname_length= NAME_CHAR_LEN;
#endif
const char *safe_vio_type_name(Vio *vio)
{
size_t unused;
#ifdef EMBEDDED_LIBRARY
if (!vio) return "Internal";
#endif
return vio_type_name(vio_type(vio), &unused);
}
#include "sql_acl_getsort.ic"
static Lex_ident_plugin native_password_plugin_name=
"mysql_native_password"_Lex_ident_plugin;
static Lex_ident_plugin old_password_plugin_name=
"mysql_old_password"_Lex_ident_plugin;
/// @todo make it configurable
LEX_CSTRING *default_auth_plugin_name= &native_password_plugin_name;
/*
Wildcard host, matches any hostname
*/
LEX_CSTRING host_not_specified= { STRING_WITH_LEN("%") };
/*
Constants, used in the SHOW GRANTS command.
Their actual string values are irrelevant, they're always compared
as pointers to these string constants.
*/
LEX_CSTRING current_user= { STRING_WITH_LEN("*current_user") };
LEX_CSTRING current_role= { STRING_WITH_LEN("*current_role") };
LEX_CSTRING current_user_and_current_role=
{ STRING_WITH_LEN("*current_user_and_current_role") };
LEX_CSTRING none= {STRING_WITH_LEN("NONE") };
LEX_CSTRING public_name= {STRING_WITH_LEN("PUBLIC") };
static plugin_ref old_password_plugin;
static plugin_ref native_password_plugin;
static plugin_ref get_auth_plugin(THD *thd, const LEX_CSTRING &name, bool *locked)
{
if (name.str == native_password_plugin_name.str)
return native_password_plugin;
else if (name.str == old_password_plugin_name.str)
return old_password_plugin;
*locked=true;
return my_plugin_lock_by_name(thd, &name, MYSQL_AUTHENTICATION_PLUGIN);
}
/* Classes */
struct acl_host_and_ip
{
char *hostname;
long ip, ip_mask; // Used with masked ip:s
};
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static bool compare_hostname(const acl_host_and_ip *, const char *, const char *);
static inline bool is_public(const char *l) { return l == public_name.str; }
static inline bool is_public(const LEX_CSTRING *l) { return is_public(l->str); }
static inline bool is_public(const LEX_USER *l) { return is_public(&l->user); }
#else
#define compare_hostname(X,Y,Z) 0
#endif
class ACL_ACCESS {
public:
ulonglong sort;
privilege_t access;
ACL_ACCESS()
:sort(0), access(NO_ACL)
{ }
};
/* ACL_HOST is used if no host is specified */
class ACL_HOST :public ACL_ACCESS
{
public:
acl_host_and_ip host;
char *db;
};
class ACL_USER_BASE :public ACL_ACCESS, public Sql_alloc
{
public:
ACL_USER_BASE()
:flags(0), user(null_clex_str)
{
bzero(&role_grants, sizeof(role_grants));
}
uchar flags; // field used to store various state information
LEX_CSTRING user;
/* list to hold references to granted roles (ACL_ROLE instances) */
DYNAMIC_ARRAY role_grants;
const char *get_username() { return user.str; }
};
class ACL_USER_PARAM
{
public:
ACL_USER_PARAM()
{
bzero(this, sizeof(*this));
}
acl_host_and_ip host;
size_t hostname_length;
USER_RESOURCES user_resource;
enum SSL_type ssl_type;
uint password_errors;
const char *ssl_cipher, *x509_issuer, *x509_subject;
LEX_CSTRING default_rolename;
struct AUTH { LEX_CSTRING plugin, auth_string, salt; } *auth;
uint nauth;
bool account_locked;
bool password_expired;
my_time_t password_last_changed;
longlong password_lifetime;
bool alloc_auth(MEM_ROOT *root, uint n)
{
return !(auth= (AUTH*) alloc_root(root, (nauth= n)*sizeof(AUTH)));
}
Lex_ident_host hostname() const
{
DBUG_ASSERT(host.hostname[hostname_length] == '\0');
return Lex_ident_host(host.hostname, hostname_length);
}
};
class ACL_USER :public ACL_USER_BASE, public ACL_USER_PARAM
{
public:
ACL_USER() = default;
ACL_USER(THD *, const LEX_USER &, const Account_options &, const privilege_t);
ACL_USER *copy(MEM_ROOT *root)
{
ACL_USER *dst;
AUTH *dauth;
if (!multi_alloc_root(root, &dst, sizeof(ACL_USER),
&dauth, sizeof(AUTH)*nauth, NULL))
return 0;
*dst= *this;
dst->user= safe_lexcstrdup_root(root, user);
dst->ssl_cipher= safe_strdup_root(root, ssl_cipher);
dst->x509_issuer= safe_strdup_root(root, x509_issuer);
dst->x509_subject= safe_strdup_root(root, x509_subject);
dst->auth= dauth;
for (uint i=0; i < nauth; i++, dauth++)
{
if (auth[i].plugin.str == native_password_plugin_name.str ||
auth[i].plugin.str == old_password_plugin_name.str)
dauth->plugin= auth[i].plugin;
else
dauth->plugin= safe_lexcstrdup_root(root, auth[i].plugin);
dauth->auth_string= safe_lexcstrdup_root(root, auth[i].auth_string);
if (auth[i].salt.length == 0)
dauth->salt= auth[i].salt;
else
dauth->salt= safe_lexcstrdup_root(root, auth[i].salt);
}
dst->host.hostname= safe_strdup_root(root, host.hostname);
dst->default_rolename= safe_lexcstrdup_root(root, default_rolename);
bzero(&dst->role_grants, sizeof(role_grants));
return dst;
}
bool wild_eq(const char *user2, const char *host2, const char *ip2)
{
if (strcmp(user.str, user2))
return false;
return compare_hostname(&host, host2, ip2 ? ip2 : host2);
}
};
class ACL_ROLE :public ACL_USER_BASE
{
public:
/*
In case of granting a role to a role, the access bits are merged together
via a bit OR operation and placed in the ACL_USER::access field.
When rebuilding role_grants via the rebuild_role_grant function,
the ACL_USER::access field needs to be reset first. The field
initial_role_access holds initial grants, as granted directly to the role
*/
privilege_t initial_role_access;
/*
In subgraph traversal, when we need to traverse only a part of the graph
(e.g. all direct and indirect grantees of a role X), the counter holds the
number of affected neighbour nodes.
See also propagate_role_grants()
*/
uint counter;
DYNAMIC_ARRAY parent_grantee; // array of backlinks to elements granted
ACL_ROLE(ACL_USER *user);
ACL_ROLE(const char *rolename, privilege_t privileges, MEM_ROOT *mem);
};
class ACL_DB :public ACL_ACCESS
{
public:
ACL_DB() :initial_access(NO_ACL) { }
acl_host_and_ip host;
const char *user,*db;
privilege_t initial_access; /* access bits present in the table */
const char *get_username() { return user; }
};
#ifndef DBUG_OFF
/* status variables, only visible in SHOW STATUS after -#d,role_merge_stats */
ulong role_global_merges= 0, role_db_merges= 0, role_table_merges= 0,
role_column_merges= 0, role_routine_merges= 0;
#endif
#ifndef NO_EMBEDDED_ACCESS_CHECKS
static void update_hostname(acl_host_and_ip *host, const char *hostname);
static bool show_proxy_grants (THD *, const char *, const char *,
char *, size_t);
static bool show_role_grants(THD *, const char *,
ACL_USER_BASE *, char *, size_t);
static bool show_default_role(THD *, ACL_USER *, char *, size_t);
static bool show_global_privileges(THD *, ACL_USER_BASE *,
bool, char *, size_t);
static bool show_database_privileges(THD *, const char *, const char *,
char *, size_t);
static bool show_table_and_column_privileges(THD *, const char *, const char *,
char *, size_t);
static int show_routine_grants(THD *, const char *, const char *,
const Sp_handler *sph, char *, int);
static ACL_ROLE *acl_public= NULL;
inline privilege_t public_access()
{
return (acl_public ? acl_public->access : NO_ACL);
}
class Grant_tables;
class User_table;
class Proxies_priv_table;
class ACL_PROXY_USER :public ACL_ACCESS
{
acl_host_and_ip host;
const char *user;
acl_host_and_ip proxied_host;
const char *proxied_user;
bool with_grant;
typedef enum {
MYSQL_PROXIES_PRIV_HOST,
MYSQL_PROXIES_PRIV_USER,
MYSQL_PROXIES_PRIV_PROXIED_HOST,
MYSQL_PROXIES_PRIV_PROXIED_USER,
MYSQL_PROXIES_PRIV_WITH_GRANT,
MYSQL_PROXIES_PRIV_GRANTOR,
MYSQL_PROXIES_PRIV_TIMESTAMP } proxy_table_fields;
public:
ACL_PROXY_USER () = default;
void init(const char *host_arg, const char *user_arg,
const char *proxied_host_arg, const char *proxied_user_arg,
bool with_grant_arg)
{
user= user_arg;
update_hostname (&host, (host_arg && *host_arg) ? host_arg : NULL);
proxied_user= proxied_user_arg;
update_hostname (&proxied_host,
(proxied_host_arg && *proxied_host_arg) ?
proxied_host_arg : NULL);
with_grant= with_grant_arg;
sort= get_magic_sort("huhu", host.hostname, user, proxied_host.hostname,
proxied_user);
}
void init(MEM_ROOT *mem, const char *host_arg, const char *user_arg,
const char *proxied_host_arg, const char *proxied_user_arg,
bool with_grant_arg)
{
init ((host_arg && *host_arg) ? strdup_root (mem, host_arg) : NULL,
strdup_root (mem, user_arg),
(proxied_host_arg && *proxied_host_arg) ?
strdup_root (mem, proxied_host_arg) : NULL,
strdup_root (mem, proxied_user_arg),
with_grant_arg);
}
void init(const Proxies_priv_table& proxies_priv_table, MEM_ROOT *mem);
bool get_with_grant() { return with_grant; }
const char *get_user() { return user; }
const char *get_host() { return host.hostname; }
const char *get_proxied_user() { return proxied_user; }
const char *get_proxied_host() { return proxied_host.hostname; }
void set_user(MEM_ROOT *mem, const char *user_arg)
{
user= *user_arg ? strdup_root(mem, user_arg) : "";
}
void set_host(MEM_ROOT *mem, const char *host_arg)
{
update_hostname(&host, safe_strdup_root(mem, host_arg));
}
bool check_validity()
{
if (opt_skip_name_resolve &&
(hostname_requires_resolving(host.hostname) ||
hostname_requires_resolving(proxied_host.hostname)))
{
sql_print_warning("'proxies_priv' entry '%s@%s %s@%s' "
"ignored in --skip-name-resolve mode.",
proxied_user,
safe_str(proxied_host.hostname), user,
safe_str(host.hostname));
return TRUE;
}
return FALSE;
}
bool matches(const char *host_arg, const char *user_arg, const char *ip_arg,
const char *proxied_user_arg)
{
DBUG_ENTER("ACL_PROXY_USER::matches");
DBUG_PRINT("info", ("compare_hostname(%s,%s,%s) &&"
"compare_hostname(%s,%s,%s) &&"
"wild_compare (%s,%s) &&"
"wild_compare (%s,%s)",
host.hostname, host_arg, ip_arg, proxied_host.hostname,
host_arg, ip_arg, user_arg, user,
proxied_user_arg, proxied_user));
DBUG_RETURN(compare_hostname(&host, host_arg, ip_arg) &&
compare_hostname(&proxied_host, host_arg, ip_arg) &&
(!*user || !strcmp(user_arg, user)) &&
(!*proxied_user || !strcmp(proxied_user_arg, proxied_user)));
}
inline static bool auth_element_equals(const char *a, const char *b)
{
return (a == b || (a != NULL && b != NULL && !strcmp(a,b)));
}
bool pk_equals(ACL_PROXY_USER *grant)
{
DBUG_ENTER("pk_equals");
DBUG_PRINT("info", ("strcmp(%s,%s) &&"
"strcmp(%s,%s) &&"
"wild_compare (%s,%s) &&"
"wild_compare (%s,%s)",
user, grant->user, proxied_user, grant->proxied_user,
host.hostname, grant->host.hostname,
proxied_host.hostname, grant->proxied_host.hostname));
bool res= auth_element_equals(user, grant->user) &&
auth_element_equals(proxied_user, grant->proxied_user) &&
auth_element_equals(host.hostname, grant->host.hostname) &&
auth_element_equals(proxied_host.hostname,
grant->proxied_host.hostname);
DBUG_RETURN(res);
}
bool granted_on(const char *host_arg, const char *user_arg)
{
return (!strcmp(user, user_arg) &&
((!host.hostname && (!host_arg || !host_arg[0])) ||
(host.hostname && host_arg && !strcmp(host.hostname, host_arg))));
}
void print_grant(String *str)
{
str->append(STRING_WITH_LEN("GRANT PROXY ON '"));
str->append(proxied_user, strlen(proxied_user));
str->append(STRING_WITH_LEN("'@'"));
if (proxied_host.hostname)
str->append(proxied_host.hostname, strlen(proxied_host.hostname));
str->append(STRING_WITH_LEN("' TO '"));
str->append(user, strlen(user));
str->append(STRING_WITH_LEN("'@'"));
if (host.hostname)
str->append(host.hostname, strlen(host.hostname));
str->append(STRING_WITH_LEN("'"));
if (with_grant)
str->append(STRING_WITH_LEN(" WITH GRANT OPTION"));
}
void set_data(ACL_PROXY_USER *grant)
{
with_grant= grant->with_grant;
}
static int store_pk(TABLE *table,
const LEX_CSTRING *host,
const LEX_CSTRING *user,
const LEX_CSTRING *proxied_host,
const LEX_CSTRING *proxied_user)
{
DBUG_ENTER("ACL_PROXY_USER::store_pk");
DBUG_PRINT("info", ("host=%s, user=%s, proxied_host=%s, proxied_user=%s",
host->str, user->str,
proxied_host->str, proxied_user->str));
if (table->field[MYSQL_PROXIES_PRIV_HOST]->store(host->str,
host->length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_USER]->store(user->str,
user->length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_PROXIED_HOST]->store(proxied_host->str,
proxied_host->length,
system_charset_info))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_PROXIED_USER]->store(proxied_user->str,
proxied_user->length,
system_charset_info))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
static int store_data_record(TABLE *table,
const LEX_CSTRING *host,
const LEX_CSTRING *user,
const LEX_CSTRING *proxied_host,
const LEX_CSTRING *proxied_user,
bool with_grant,
const char *grantor)
{
DBUG_ENTER("ACL_PROXY_USER::store_pk");
if (store_pk(table, host, user, proxied_host, proxied_user))
DBUG_RETURN(TRUE);
DBUG_PRINT("info", ("with_grant=%s", with_grant ? "TRUE" : "FALSE"));
if (table->field[MYSQL_PROXIES_PRIV_WITH_GRANT]->store(with_grant ? 1 : 0,
TRUE))
DBUG_RETURN(TRUE);
if (table->field[MYSQL_PROXIES_PRIV_GRANTOR]->store(grantor,
strlen(grantor),
system_charset_info))
DBUG_RETURN(TRUE);
DBUG_RETURN(FALSE);
}
};
#define FIRST_NON_YN_FIELD 26
class acl_entry :public hash_filo_element
{
public:
privilege_t access;
uint16 length;
char key[1]; // Key will be stored here
};
static uchar* acl_entry_get_key(acl_entry *entry, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length=(uint) entry->length;
return (uchar*) entry->key;
}
static uchar* acl_role_get_key(ACL_ROLE *entry, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length=(uint) entry->user.length;
return (uchar*) entry->user.str;
}
struct ROLE_GRANT_PAIR : public Sql_alloc
{
LEX_CSTRING u_uname;
LEX_CSTRING u_hname;
LEX_CSTRING r_uname;
LEX_STRING hashkey;
bool with_admin;
bool init(MEM_ROOT *mem,
const LEX_CSTRING &username,
const LEX_CSTRING &hostname,
const LEX_CSTRING &rolename,
bool with_admin_option);
};
static uchar* acl_role_map_get_key(ROLE_GRANT_PAIR *entry, size_t *length,
my_bool not_used __attribute__((unused)))
{
*length=(uint) entry->hashkey.length;
return (uchar*) entry->hashkey.str;
}
bool ROLE_GRANT_PAIR::init(MEM_ROOT *mem,
const LEX_CSTRING &username,
const LEX_CSTRING &hostname,
const LEX_CSTRING &rolename,
bool with_admin_option)
{
/*
Create a buffer that holds all 3 NULL terminated strings in succession
To save memory space, the same buffer is used as the hashkey
Add the '\0' aswell.
*/
size_t bufflen= username.length + hostname.length + rolename.length + 3;
char *buff= (char *)alloc_root(mem, bufflen);
if (!buff)
return true;
/*
Offsets in the buffer for all 3 strings
*/
char *username_pos= buff;
char *hostname_pos= buff + username.length + 1;
char *rolename_pos= buff + username.length + hostname.length + 2;
if (username.str) //prevent undefined behaviour
memcpy(username_pos, username.str, username.length);
username_pos[username.length]= '\0'; //#1 string terminator
u_uname= Lex_cstring(username_pos, username.length);
if (hostname.str) //prevent undefined behaviour
memcpy(hostname_pos, hostname.str, hostname.length);
hostname_pos[hostname.length]= '\0'; //#2 string terminator
u_hname= Lex_cstring(hostname_pos, hostname.length);
if (rolename.str) //prevent undefined behaviour
memcpy(rolename_pos, rolename.str, rolename.length);
rolename_pos[rolename.length]= '\0'; //#3 string terminator
r_uname= Lex_cstring(rolename_pos, rolename.length);
hashkey.str = buff;
hashkey.length = bufflen;
with_admin= with_admin_option;
return false;
}
#define IP_ADDR_STRLEN (3 + 1 + 3 + 1 + 3 + 1 + 3)
#if defined(HAVE_OPENSSL)
/*
Without SSL the handshake consists of one packet. This packet
has both client capabilities and scrambled password.
With SSL the handshake might consist of two packets. If the first
packet (client capabilities) has CLIENT_SSL flag set, we have to
switch to SSL and read the second packet. The scrambled password
is in the second packet and client_capabilities field will be ignored.
Maybe it is better to accept flags other than CLIENT_SSL from the
second packet?
*/
#define SSL_HANDSHAKE_SIZE 2
#define MIN_HANDSHAKE_SIZE 2
#else
#define MIN_HANDSHAKE_SIZE 6
#endif /* HAVE_OPENSSL && !EMBEDDED_LIBRARY */
#define NORMAL_HANDSHAKE_SIZE 6
#define ROLE_ASSIGN_COLUMN_IDX 44
#define DEFAULT_ROLE_COLUMN_IDX 45
#define MAX_STATEMENT_TIME_COLUMN_IDX 46
/* various flags valid for ACL_USER */
#define IS_ROLE (1L << 0)
/* Flag to mark that a ROLE is on the recursive DEPTH_FIRST_SEARCH stack */
#define ROLE_ON_STACK (1L << 1)
/*
Flag to mark that a ROLE and all it's neighbours have
been visited
*/
#define ROLE_EXPLORED (1L << 2)
/* Flag to mark that on_node was already called for this role */
#define ROLE_OPENED (1L << 3)
static DYNAMIC_ARRAY acl_hosts, acl_users, acl_proxy_users;
static Dynamic_array<ACL_DB> acl_dbs(PSI_INSTRUMENT_MEM, 0, 50);
typedef Dynamic_array<ACL_DB>::CMP_FUNC acl_dbs_cmp;
static HASH acl_roles;
/*
An hash containing mappings user <--> role
A hash is used so as to make updates quickly
The hashkey used represents all the entries combined
*/
static HASH acl_roles_mappings;
static MEM_ROOT acl_memroot, grant_memroot;
static bool initialized=0;
static bool allow_all_hosts=1;
static HASH acl_check_hosts, column_priv_hash, proc_priv_hash, func_priv_hash;
static HASH package_spec_priv_hash, package_body_priv_hash;
static DYNAMIC_ARRAY acl_wild_hosts;
static Hash_filo<acl_entry> *acl_cache;
static uint grant_version=0; /* Version of priv tables. incremented by acl_load */
static privilege_t get_access(TABLE *form, uint fieldnr, uint *next_field=0);
static int acl_compare(const ACL_ACCESS *a, const ACL_ACCESS *b);
static int acl_user_compare(const ACL_USER *a, const ACL_USER *b);
static void rebuild_acl_users();
static int acl_db_compare(const ACL_DB *a, const ACL_DB *b);
static void rebuild_acl_dbs();
static void init_check_host(void);
static void rebuild_check_host(void);
static void rebuild_role_grants(void);
static ACL_USER *find_user_exact(const LEX_CSTRING &host,
const LEX_CSTRING &user);
static ACL_USER *find_user_wild(const LEX_CSTRING &host,
const LEX_CSTRING &user,
const LEX_CSTRING &ip= null_clex_str);
static ACL_ROLE *find_acl_role(const LEX_CSTRING &user, bool allow_public);
static ROLE_GRANT_PAIR *find_role_grant_pair(const LEX_CSTRING *u, const LEX_CSTRING *h, const LEX_CSTRING *r);
static ACL_USER_BASE *find_acl_user_base(const LEX_CSTRING &user,
const LEX_CSTRING &host);
static bool update_user_table_password(THD *, const User_table&, const ACL_USER&);
static bool acl_load(THD *thd, const Grant_tables& grant_tables);
static inline void get_grantor(THD *thd, char* grantor);
static bool add_role_user_mapping(const LEX_CSTRING &uname,
const LEX_CSTRING &hname,
const LEX_CSTRING &rname);
static bool get_YN_as_bool(Field *field);
#define ROLE_CYCLE_FOUND 2
static int traverse_role_graph_up(ACL_ROLE *, void *,
int (*) (ACL_ROLE *, void *),
int (*) (ACL_ROLE *, ACL_ROLE *, void *));
static int traverse_role_graph_down(ACL_USER_BASE *, void *,
int (*) (ACL_USER_BASE *, void *),
int (*) (ACL_USER_BASE *, ACL_ROLE *, void *));
HASH *Sp_handler_procedure::get_priv_hash() const
{
return &proc_priv_hash;
}
HASH *Sp_handler_function::get_priv_hash() const
{
return &func_priv_hash;
}
HASH *Sp_handler_package_spec::get_priv_hash() const
{
return &package_spec_priv_hash;
}
HASH *Sp_handler_package_body::get_priv_hash() const
{
return &package_body_priv_hash;
}
/*
Enumeration of ACL/GRANT tables in the mysql database
*/
enum enum_acl_tables
{
DB_TABLE,
TABLES_PRIV_TABLE,
COLUMNS_PRIV_TABLE,
#define FIRST_OPTIONAL_TABLE HOST_TABLE
HOST_TABLE,
PROCS_PRIV_TABLE,
PROXIES_PRIV_TABLE,
ROLES_MAPPING_TABLE,
USER_TABLE // <== always the last
};
static const int Table_user= 1 << USER_TABLE;
static const int Table_db= 1 << DB_TABLE;
static const int Table_tables_priv= 1 << TABLES_PRIV_TABLE;
static const int Table_columns_priv= 1 << COLUMNS_PRIV_TABLE;
static const int Table_host= 1 << HOST_TABLE;
static const int Table_procs_priv= 1 << PROCS_PRIV_TABLE;
static const int Table_proxies_priv= 1 << PROXIES_PRIV_TABLE;
static const int Table_roles_mapping= 1 << ROLES_MAPPING_TABLE;
static LEX_CSTRING MYSQL_TABLE_NAME[USER_TABLE+1]= {
{STRING_WITH_LEN("db")},
{STRING_WITH_LEN("tables_priv")},
{STRING_WITH_LEN("columns_priv")},
{STRING_WITH_LEN("host")},
{STRING_WITH_LEN("procs_priv")},
{STRING_WITH_LEN("proxies_priv")},
{STRING_WITH_LEN("roles_mapping")},
{STRING_WITH_LEN("global_priv")}
};
static LEX_CSTRING MYSQL_TABLE_NAME_USER={STRING_WITH_LEN("user")};
/**
Choose from either native or old password plugins when assigning a password
*/
static LEX_CSTRING &guess_auth_plugin(THD *thd, size_t password_len)
{
if (thd->variables.old_passwords == 1 ||
password_len == SCRAMBLED_PASSWORD_CHAR_LENGTH_323)
return old_password_plugin_name;
else
return native_password_plugin_name;
}
/**
Base class representing a generic grant table from the mysql database.
The potential tables that this class can represent are:
user, db, columns_priv, tables_priv, host, procs_priv, proxies_priv,
roles_mapping
Objects belonging to this parent class can only be constructed by the
Grants_table class. This ensures the correct initialization of the objects.
*/
class Grant_table_base
{
public:
/* Number of fields for this Grant Table. */
uint num_fields() const { return m_table->s->fields; }
/* Check if the table exists after an attempt to open it was made.
Some tables, such as the host table in MySQL 5.6.7+ are missing. */
bool table_exists() const { return m_table; };
/* Initializes the READ_RECORD structure provided as a parameter
to read through the whole table, with all columns available. Cleaning up
is the caller's job. */
bool init_read_record(READ_RECORD* info) const
{
DBUG_ASSERT(m_table);
if (num_fields() < min_columns)
{
my_printf_error(ER_UNKNOWN_ERROR, "Fatal error: mysql.%s table is "
"damaged or in unsupported 3.20 format",
MYF(ME_ERROR_LOG), m_table->s->table_name.str);
return 1;
}
bool result= ::init_read_record(info, m_table->in_use, m_table,
NULL, NULL, 1, true, false);
if (!result)
m_table->use_all_columns();
return result;
}
/* Return the underlying TABLE handle. */
TABLE* table() const { return m_table; }
privilege_t get_access() const
{
ulonglong access_bits= 0, bit= 1;
for (uint i = start_priv_columns; i < end_priv_columns; i++, bit<<=1)
{
if (get_YN_as_bool(m_table->field[i]))
access_bits|= bit;
}
return ALL_KNOWN_ACL & access_bits;
}
protected:
friend class Grant_tables;
Grant_table_base() : min_columns(3), start_priv_columns(0), end_priv_columns(0), m_table(0)
{ }
/* Compute how many privilege columns this table has. This method
can only be called after the table has been opened.
IMPLEMENTATION
A privilege column is of type enum('Y', 'N'). Privilege columns are
expected to be one after another.
*/
void set_table(TABLE *table)
{
if (!(m_table= table)) // Table does not exist or not opened.
return;
for (end_priv_columns= 0; end_priv_columns < num_fields(); end_priv_columns++)
{
Field *field= m_table->field[end_priv_columns];
if (field->real_type() == MYSQL_TYPE_ENUM &&
static_cast<Field_enum*>(field)->typelib->count == 2)
{
if (!start_priv_columns)
start_priv_columns= end_priv_columns;
}
else if (start_priv_columns)
break;
}
}
/* the min number of columns a table should have */
uint min_columns;
/* The index at which privilege columns start. */
uint start_priv_columns;
/* The index after the last privilege column */
uint end_priv_columns;
TABLE *m_table;
};
class User_table: public Grant_table_base
{
public:
bool init_read_record(READ_RECORD* info) const
{
return Grant_table_base::init_read_record(info) || setup_sysvars();
}
virtual LEX_CSTRING& name() const = 0;
virtual int get_auth(THD *, MEM_ROOT *, ACL_USER *u) const= 0;
virtual bool set_auth(const ACL_USER &u) const = 0;
virtual privilege_t get_access() const = 0;
virtual void set_access(const privilege_t rights, bool revoke) const = 0;
char *get_host(MEM_ROOT *root) const
{ return ::get_field(root, m_table->field[0]); }
int set_host(const char *s, size_t l) const
{ return m_table->field[0]->store(s, l, system_charset_info); };
char *get_user(MEM_ROOT *root) const
{ return ::get_field(root, m_table->field[1]); }
int set_user(const char *s, size_t l) const
{ return m_table->field[1]->store(s, l, system_charset_info); };
virtual SSL_type get_ssl_type () const = 0;
virtual int set_ssl_type (SSL_type x) const = 0;
virtual const char* get_ssl_cipher (MEM_ROOT *root) const = 0;
virtual int set_ssl_cipher (const char *s, size_t l) const = 0;
virtual const char* get_x509_issuer (MEM_ROOT *root) const = 0;
virtual int set_x509_issuer (const char *s, size_t l) const = 0;
virtual const char* get_x509_subject (MEM_ROOT *root) const = 0;
virtual int set_x509_subject (const char *s, size_t l) const = 0;
virtual longlong get_max_questions () const = 0;
virtual int set_max_questions (longlong x) const = 0;
virtual longlong get_max_updates () const = 0;
virtual int set_max_updates (longlong x) const = 0;
virtual longlong get_max_connections () const = 0;
virtual int set_max_connections (longlong x) const = 0;
virtual longlong get_max_user_connections () const = 0;
virtual int set_max_user_connections (longlong x) const = 0;
virtual double get_max_statement_time () const = 0;
virtual int set_max_statement_time (double x) const = 0;
virtual bool get_is_role () const = 0;
virtual int set_is_role (bool x) const = 0;
virtual const char* get_default_role (MEM_ROOT *root) const = 0;
virtual int set_default_role (const char *s, size_t l) const = 0;
virtual bool get_account_locked () const = 0;
virtual int set_account_locked (bool x) const = 0;
virtual bool get_password_expired () const = 0;
virtual int set_password_expired (bool x) const = 0;
virtual my_time_t get_password_last_changed () const = 0;
virtual int set_password_last_changed (my_time_t x) const = 0;
virtual longlong get_password_lifetime () const = 0;
virtual int set_password_lifetime (longlong x) const = 0;
virtual ~User_table() = default;
private:
friend class Grant_tables;
virtual int setup_sysvars() const = 0;
};
/* MySQL-3.23 to MariaDB 10.3 `user` table */
class User_table_tabular: public User_table
{
public:
LEX_CSTRING& name() const { return MYSQL_TABLE_NAME_USER; }
int get_auth(THD *thd, MEM_ROOT *root, ACL_USER *u) const
{
mysql_mutex_assert_owner(&acl_cache->lock);
u->alloc_auth(root, 1);
if (have_password())
{
const char *as= safe_str(::get_field(&acl_memroot, password()));
u->auth->auth_string.str= as;
u->auth->auth_string.length= strlen(as);
u->auth->plugin= guess_auth_plugin(thd, u->auth->auth_string.length);
}
else
{
u->auth->plugin= native_password_plugin_name;
u->auth->auth_string= empty_clex_str;
}
if (plugin() && authstr())
{
char *tmpstr= ::get_field(&acl_memroot, plugin());
if (tmpstr)
{
const char *pw= u->auth->auth_string.str;
const char *as= safe_str(::get_field(&acl_memroot, authstr()));
if (*pw)
{
if (*as && strcmp(as, pw))
{
sql_print_warning("'user' entry '%s@%s' has both a password and an "
"authentication plugin specified. The password will be ignored.",
safe_str(get_user(thd->mem_root)), safe_str(get_host(thd->mem_root)));
}
else
as= pw;
}
u->auth->plugin.str= tmpstr;
u->auth->plugin.length= strlen(tmpstr);
u->auth->auth_string.str= as;
u->auth->auth_string.length= strlen(as);
}
}
return 0;
}
bool set_auth(const ACL_USER &u) const
{
if (u.nauth != 1)
return 1;