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sql_user.cc
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/* Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
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 St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql_parse.h" /* check_access */
#include "rpl_filter.h" /* rpl_filter */
#include "sql_base.h" /* MYSQL_LOCK_IGNORE_TIMEOUT */
#include "sql_table.h" /* open_ltable */
#include "sql_plugin.h" /* lock_plugin_data etc. */
#include "password.h" /* my_make_scrambled_password */
#include "log_event.h" /* append_query_string */
#include "key.h" /* key_copy, key_cmp_if_same */
/* key_restore */
#include "auth_internal.h"
#include "sql_auth_cache.h"
#include "sql_authentication.h"
#include "prealloced_array.h"
#include "tztime.h"
#include "crypt_genhash_impl.h" /* CRYPT_MAX_PASSWORD_SIZE */
/**
Auxiliary function for constructing a user list string.
This function is used for error reporting and logging.
@param thd Thread context
@param str A String to store the user list.
@param user A LEX_USER which will be appended into user list.
@param comma If TRUE, append a ',' before the the user.
@param ident If TRUE, append ' IDENTIFIED BY/WITH...' after the user,
if the given user has credentials set with 'IDENTIFIED BY/WITH'
*/
void append_user(THD *thd, String *str, LEX_USER *user, bool comma= true,
bool ident= false)
{
String from_user(user->user.str, user->user.length, system_charset_info);
String from_plugin(user->plugin.str, user->plugin.length, system_charset_info);
String from_auth(user->auth.str, user->auth.length, system_charset_info);
String from_host(user->host.str, user->host.length, system_charset_info);
if (comma)
str->append(',');
append_query_string(thd, system_charset_info, &from_user, str);
str->append(STRING_WITH_LEN("@"));
append_query_string(thd, system_charset_info, &from_host, str);
if (ident)
{
if (user->plugin.str && (user->plugin.length > 0) &&
memcmp(user->plugin.str, native_password_plugin_name.str,
user->plugin.length))
{
/**
The plugin identifier is allowed to be specified,
both with and without quote marks. We log it with
quotes always.
*/
str->append(STRING_WITH_LEN(" IDENTIFIED WITH "));
append_query_string(thd, system_charset_info, &from_plugin, str);
if (user->auth.str && (user->auth.length > 0))
{
str->append(STRING_WITH_LEN(" AS "));
append_query_string(thd, system_charset_info, &from_auth, str);
}
}
else if (user->auth.str)
{
str->append(STRING_WITH_LEN(" IDENTIFIED BY PASSWORD '"));
if (user->uses_identified_by_password_clause ||
user->uses_authentication_string_clause)
{
str->append(user->auth.str, user->auth.length);
str->append("'");
}
else
{
/*
Password algorithm is chosen based on old_passwords variable or
TODO the new password_algorithm variable.
It is assumed that the variable hasn't changed since parsing.
*/
if (thd->variables.old_passwords == 0)
{
/*
my_make_scrambled_password_sha1() requires a target buffer size of
SCRAMBLED_PASSWORD_CHAR_LENGTH + 1.
The extra character is for the probably originate from either '\0'
or the initial '*' character.
*/
char tmp[SCRAMBLED_PASSWORD_CHAR_LENGTH + 1];
my_make_scrambled_password_sha1(tmp, user->auth.str,
user->auth.length);
str->append(tmp);
}
else
{
/*
With old_passwords == 2 the scrambled password will be binary.
*/
DBUG_ASSERT(thd->variables.old_passwords = 2);
str->append("<secret>");
}
str->append("'");
}
}
}
}
void append_user_new(THD *thd, String *str, LEX_USER *user, bool comma= true)
{
String from_user(user->user.str, user->user.length, system_charset_info);
String from_plugin(user->plugin.str, user->plugin.length, system_charset_info);
String default_plugin(default_auth_plugin_name.str,
default_auth_plugin_name.length, system_charset_info);
String from_auth(user->auth.str, user->auth.length, system_charset_info);
String from_host(user->host.str, user->host.length, system_charset_info);
if (comma)
str->append(',');
append_query_string(thd, system_charset_info, &from_user, str);
str->append(STRING_WITH_LEN("@"));
append_query_string(thd, system_charset_info, &from_host, str);
/* CREATE USER is always rewritten with IDENTIFIED WITH .. AS */
if (thd->lex->sql_command == SQLCOM_CREATE_USER)
{
str->append(STRING_WITH_LEN(" IDENTIFIED WITH "));
if (user->plugin.length > 0)
append_query_string(thd, system_charset_info, &from_plugin, str);
else
append_query_string(thd, system_charset_info, &default_plugin, str);
if (user->auth.length > 0)
{
str->append(STRING_WITH_LEN(" AS "));
if (thd->lex->contains_plaintext_password)
{
str->append("'");
str->append(STRING_WITH_LEN("<secret>"));
str->append("'");
}
else
append_query_string(thd, system_charset_info, &from_auth, str);
}
}
else
{
if (user->uses_identified_by_clause ||
user->uses_identified_with_clause ||
user->uses_identified_by_password_clause)
{
str->append(STRING_WITH_LEN(" IDENTIFIED WITH "));
if (user->plugin.length > 0)
append_query_string(thd, system_charset_info, &from_plugin, str);
else
append_query_string(thd, system_charset_info, &default_plugin, str);
if (user->auth.length > 0)
{
str->append(STRING_WITH_LEN(" AS "));
if (thd->lex->contains_plaintext_password)
{
str->append("'");
str->append(STRING_WITH_LEN("<secret>"));
str->append("'");
}
else
append_query_string(thd, system_charset_info, &from_auth, str);
}
}
}
}
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/*
Enumeration of various ACL's and Hashes used in handle_grant_struct()
*/
enum enum_acl_lists
{
USER_ACL= 0,
DB_ACL,
COLUMN_PRIVILEGES_HASH,
PROC_PRIVILEGES_HASH,
FUNC_PRIVILEGES_HASH,
PROXY_USERS_ACL
};
int check_change_password(THD *thd, const char *host, const char *user,
const char *new_password, size_t new_password_len)
{
Security_context *sctx;
if (!initialized)
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--skip-grant-tables");
return(1);
}
sctx= thd->security_context();
if (!thd->slave_thread &&
(strcmp(sctx->user().str, user) ||
my_strcasecmp(system_charset_info, host,
sctx->priv_host().str)))
{
if (sctx->password_expired())
{
my_error(ER_MUST_CHANGE_PASSWORD, MYF(0));
return(1);
}
if (check_access(thd, UPDATE_ACL, "mysql", NULL, NULL, 1, 0))
return(1);
}
if (!thd->slave_thread &&
likely((get_server_state() == SERVER_OPERATING)) &&
!strcmp(thd->security_context()->priv_user().str,""))
{
my_message(ER_PASSWORD_ANONYMOUS_USER, ER(ER_PASSWORD_ANONYMOUS_USER),
MYF(0));
return(1);
}
return(0);
}
/**
Auxiliary function for constructing CREATE USER sql for a given user.
@param thd Thread context
@param user_name user for which the sql should be constructed.
@retval
0 OK.
1 Error.
*/
bool mysql_show_create_user(THD *thd, LEX_USER *user_name)
{
int error= 0;
ACL_USER *acl_user;
LEX *lex= thd->lex;
Protocol *protocol= thd->get_protocol();
USER_RESOURCES tmp_user_resource;
enum SSL_type ssl_type;
char *ssl_cipher, *x509_issuer, *x509_subject;
char buff[256];
Item_string *field= NULL;
List<Item> field_list;
String sql_text(buff,sizeof(buff),system_charset_info);
LEX_ALTER alter_info;
DBUG_ENTER("mysql_show_create_user");
mysql_mutex_lock(&acl_cache->lock);
if (!(acl_user= find_acl_user(user_name->host.str, user_name->user.str, TRUE)))
{
mysql_mutex_unlock(&acl_cache->lock);
String wrong_users;
append_user(thd, &wrong_users, user_name, wrong_users.length() > 0, false);
my_error(ER_CANNOT_USER, MYF(0), "SHOW CREATE USER",
wrong_users.c_ptr_safe());
DBUG_RETURN(1);
}
/* fill in plugin, auth_str from acl_user */
user_name->auth.str= acl_user->auth_string.str;
user_name->auth.length= acl_user->auth_string.length;
user_name->plugin= acl_user->plugin;
user_name->uses_identified_by_clause= true;
user_name->uses_identified_with_clause= false;
user_name->uses_identified_by_password_clause= false;
user_name->uses_authentication_string_clause= false;
/* make a copy of user resources, ssl and password expire attributes */
tmp_user_resource= lex->mqh;
lex->mqh= acl_user->user_resource;
/* Set specified_limits flags so user resources are shown properly. */
if (lex->mqh.user_conn)
lex->mqh.specified_limits|= USER_RESOURCES::USER_CONNECTIONS;
if (lex->mqh.questions)
lex->mqh.specified_limits|= USER_RESOURCES::QUERIES_PER_HOUR;
if (lex->mqh.updates)
lex->mqh.specified_limits|= USER_RESOURCES::UPDATES_PER_HOUR;
if (lex->mqh.conn_per_hour)
lex->mqh.specified_limits|= USER_RESOURCES::CONNECTIONS_PER_HOUR;
ssl_type= lex->ssl_type;
ssl_cipher= lex->ssl_cipher;
x509_issuer= lex->x509_issuer;
x509_subject= lex->x509_subject;
lex->ssl_type= acl_user->ssl_type;
lex->ssl_cipher= const_cast<char*>(acl_user->ssl_cipher);
lex->x509_issuer= const_cast<char*>(acl_user->x509_issuer);
lex->x509_subject= const_cast<char*>(acl_user->x509_subject);
alter_info= lex->alter_password;
lex->alter_password.update_password_expired_column= acl_user->password_expired;
lex->alter_password.use_default_password_lifetime= acl_user->use_default_password_lifetime;
lex->alter_password.expire_after_days= acl_user->password_lifetime;
lex->alter_password.update_account_locked_column= true;
lex->alter_password.account_locked= acl_user->account_locked;
lex->alter_password.update_password_expired_fields= true;
/* send the metadata to client */
field=new Item_string("",0,&my_charset_latin1);
field->max_length=256;
strxmov(buff,"CREATE USER for ",user_name->user.str,"@",
user_name->host.str,NullS);
field->item_name.set(buff);
field_list.push_back(field);
if (thd->send_result_metadata(&field_list,
Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
{
error= 1;
goto err;
}
sql_text.length(0);
lex->users_list.push_back(user_name);
mysql_rewrite_create_alter_user(thd, &sql_text);
/* send the result row to client */
protocol->start_row();
protocol->store(sql_text.ptr(),sql_text.length(),sql_text.charset());
if (protocol->end_row())
{
error= 1;
goto err;
}
err:
/* restore user resources, ssl and password expire attributes */
lex->mqh= tmp_user_resource;
lex->ssl_type= ssl_type;
lex->ssl_cipher= ssl_cipher;
lex->x509_issuer= x509_issuer;
lex->x509_subject= x509_subject;
lex->alter_password= alter_info;
mysql_mutex_unlock(&acl_cache->lock);
my_eof(thd);
DBUG_RETURN(error);
}
/**
This function does following:
1. Convert plain text password to hash and update the same in
user definition.
2. Validate hash string if specified in user definition.
3. Identify what all fields needs to be updated in mysql.user
table based on user definition.
@param thd Thread context
@param Str user on which attributes has to be applied
@param what_to_set User attributes
@param is_privileged_user Whether caller has CREATE_USER_ACL
or UPDATE_ACL over mysql.*
@retval 0 ok
@retval 1 ERROR;
*/
bool set_and_validate_user_attributes(THD *thd,
LEX_USER *Str,
ulong &what_to_set,
bool is_privileged_user)
{
bool user_exists= false;
ACL_USER *acl_user;
plugin_ref plugin= NULL;
char outbuf[MAX_FIELD_WIDTH]= {0};
unsigned int buflen= MAX_FIELD_WIDTH, inbuflen;
const char *inbuf;
char *password= NULL;
what_to_set= 0;
/* update plugin,auth str attributes */
if (Str->uses_identified_by_clause ||
Str->uses_identified_by_password_clause ||
Str->uses_identified_with_clause ||
Str->uses_authentication_string_clause)
what_to_set|= PLUGIN_ATTR;
else
what_to_set|= DEFAULT_AUTH_ATTR;
/* update ssl attributes */
if (thd->lex->ssl_type != SSL_TYPE_NOT_SPECIFIED)
what_to_set|= SSL_ATTR;
/* update connection attributes */
if (thd->lex->mqh.specified_limits)
what_to_set|= RESOURCE_ATTR;
if ((acl_user= find_acl_user(Str->host.str, Str->user.str, TRUE)))
user_exists= true;
/* copy password expire attributes to individual user */
Str->alter_status= thd->lex->alter_password;
/* update password expire attributes */
if (Str->alter_status.update_password_expired_column ||
!Str->alter_status.use_default_password_lifetime ||
Str->alter_status.expire_after_days)
what_to_set|= PASSWORD_EXPIRE_ATTR;
/* update account lock attribute */
if (Str->alter_status.update_account_locked_column)
what_to_set|= ACCOUNT_LOCK_ATTR;
if (user_exists)
{
if (thd->lex->sql_command == SQLCOM_ALTER_USER)
{
/* If no plugin is given, get existing plugin */
if (!Str->uses_identified_with_clause)
Str->plugin= acl_user->plugin;
/*
always check for password expire/interval attributes as there is no
way to differentiate NEVER EXPIRE and EXPIRE DEFAULT scenario
*/
what_to_set|= PASSWORD_EXPIRE_ATTR;
}
else
{
/* if IDENTIFIED WITH is not specified set plugin from cache */
if (!Str->uses_identified_with_clause)
{
Str->plugin= acl_user->plugin;
/* set auth str from cache when not specified for existing user */
if (!(Str->uses_identified_by_clause ||
Str->uses_identified_by_password_clause ||
Str->uses_authentication_string_clause))
{
Str->auth.str= acl_user->auth_string.str;
Str->auth.length= acl_user->auth_string.length;
}
}
}
/*
if there is a plugin specified with no auth string, and that
plugin supports password expiration then set the account as expired.
*/
if (Str->uses_identified_with_clause &&
!(Str->uses_identified_by_clause ||
Str->uses_authentication_string_clause) &&
auth_plugin_supports_expiration(Str->plugin.str))
{
Str->alter_status.update_password_expired_column= true;
what_to_set|= PASSWORD_EXPIRE_ATTR;
}
}
else
{
/* set default plugin for new users if not specified */
if (!Str->uses_identified_with_clause)
Str->plugin= default_auth_plugin_name;
}
plugin= my_plugin_lock_by_name(0, Str->plugin,
MYSQL_AUTHENTICATION_PLUGIN);
/* check if plugin is loaded */
if (!plugin)
{
my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), Str->plugin.str);
return(1);
}
if (user_exists &&
(what_to_set & PLUGIN_ATTR))
{
st_mysql_auth *auth= (st_mysql_auth *) plugin_decl(plugin)->info;
if (auth->authentication_flags &
AUTH_FLAG_PRIVILEGED_USER_FOR_PASSWORD_CHANGE)
{
if (!is_privileged_user &&
(thd->lex->sql_command == SQLCOM_ALTER_USER ||
thd->lex->sql_command == SQLCOM_GRANT))
{
/*
An external plugin that prevents user
to change authentication_string information
unless user is privileged.
*/
what_to_set= NONE_ATTR;
my_error(ER_ACCESS_DENIED_ERROR, MYF(0),
thd->security_context()->priv_user().str,
thd->security_context()->priv_host().str,
thd->password ? ER_THD(thd, ER_YES) : ER_THD(thd, ER_NO));
plugin_unlock(0, plugin);
return (1);
}
}
if (!(auth->authentication_flags & AUTH_FLAG_USES_INTERNAL_STORAGE))
{
if (thd->lex->sql_command == SQLCOM_SET_OPTION)
{
/*
A plugin that does not use internal storage and
hence does not support SET PASSWORD
*/
char warning_buffer[MYSQL_ERRMSG_SIZE];
my_snprintf(warning_buffer, sizeof(warning_buffer),
"SET PASSWORD has no significance for user '%s'@'%s' as "
"authentication plugin does not support it.",
Str->user.str, Str->host.str);
warning_buffer[MYSQL_ERRMSG_SIZE-1]= '\0';
push_warning(thd, Sql_condition::SL_NOTE,
ER_SET_PASSWORD_AUTH_PLUGIN,
warning_buffer);
plugin_unlock(0, plugin);
what_to_set= NONE_ATTR;
return (0);
}
}
}
/*
If auth string is specified, change it to hash.
Validate empty credentials for new user ex: CREATE USER u1;
*/
if (Str->uses_identified_by_clause ||
(Str->auth.length == 0 && !user_exists))
{
st_mysql_auth *auth= (st_mysql_auth *) plugin_decl(plugin)->info;
inbuf= Str->auth.str;
inbuflen= Str->auth.length;
if (auth->generate_authentication_string(outbuf,
&buflen,
inbuf,
inbuflen))
{
plugin_unlock(0, plugin);
return(1);
}
if (buflen)
{
password= (char *) thd->alloc(buflen);
memcpy(password, outbuf, buflen);
}
else
password= const_cast<char*>("");
/* erase in memory copy of plain text password */
memset((char*)(Str->auth.str), 0, Str->auth.length);
/* Use the authentication_string field as password */
Str->auth.str= password;
Str->auth.length= buflen;
thd->lex->contains_plaintext_password= false;
}
/* Validate hash string */
if(Str->uses_identified_by_password_clause ||
Str->uses_authentication_string_clause)
{
st_mysql_auth *auth= (st_mysql_auth *) plugin_decl(plugin)->info;
/*
Validate hash string in following cases:
1. IDENTIFIED BY PASSWORD.
2. IDENTIFIED WITH .. AS 'auth_str' for ALTER USER statement
and its a replication slave thread
*/
if (Str->uses_identified_by_password_clause ||
(Str->uses_authentication_string_clause &&
thd->lex->sql_command == SQLCOM_ALTER_USER &&
thd->slave_thread))
{
if (auth->validate_authentication_string((char*)Str->auth.str,
Str->auth.length))
{
my_error(ER_PASSWORD_FORMAT, MYF(0));
plugin_unlock(0, plugin);
return(1);
}
}
}
plugin_unlock(0, plugin);
return(0);
}
/**
Change a password hash for a user.
@param thd Thread handle
@param host Hostname
@param user User name
@param new_password New password hash for host@user
Note : it will also reset the change_password flag.
This is safe to do unconditionally since the simple userless form
SET PASSWORD = 'text' will be the only allowed form when
this flag is on. So we don't need to check user names here.
@see set_var_password::update(THD *thd)
@return Error code
@retval 0 ok
@retval 1 ERROR; In this case the error is sent to the client.
*/
bool change_password(THD *thd, const char *host, const char *user,
char *new_password)
{
TABLE_LIST tables;
TABLE *table;
LEX_USER *combo= NULL;
/* Buffer should be extended when password length is extended. */
char buff[512];
/* buffer to store the hash string */
char hash_str[MAX_FIELD_WIDTH]= {0};
ulong query_length= 0;
ulong what_to_set= 0;
bool save_binlog_row_based;
size_t new_password_len= strlen(new_password);
bool result= true, rollback_whole_statement= false;
int ret;
DBUG_ENTER("change_password");
DBUG_PRINT("enter",("host: '%s' user: '%s' new_password: '%s'",
host,user,new_password));
DBUG_ASSERT(host != 0); // Ensured by parent
if (check_change_password(thd, host, user, new_password, new_password_len))
DBUG_RETURN(1);
tables.init_one_table("mysql", 5, "user", 4, "user", TL_WRITE);
#ifdef HAVE_REPLICATION
/*
GRANT and REVOKE are applied the slave in/exclusion rules as they are
some kind of updates to the mysql.% tables.
*/
if (thd->slave_thread && rpl_filter->is_on())
{
/*
The tables must be marked "updating" so that tables_ok() takes them into
account in tests. It's ok to leave 'updating' set after tables_ok.
*/
tables.updating= 1;
/* Thanks to memset, tables.next==0 */
if (!(thd->sp_runtime_ctx || rpl_filter->tables_ok(0, &tables)))
DBUG_RETURN(0);
}
#endif
if (!(table= open_ltable(thd, &tables, TL_WRITE, MYSQL_LOCK_IGNORE_TIMEOUT)))
DBUG_RETURN(1);
if (!table->key_info)
{
my_error(ER_TABLE_CORRUPT, MYF(0), table->s->db.str,
table->s->table_name.str);
DBUG_RETURN(1);
}
/*
This statement will be replicated as a statement, even when using
row-based replication. The flag will be reset at the end of the
statement.
*/
if ((save_binlog_row_based= thd->is_current_stmt_binlog_format_row()))
thd->clear_current_stmt_binlog_format_row();
mysql_mutex_lock(&acl_cache->lock);
ACL_USER *acl_user;
if (!(acl_user= find_acl_user(host, user, TRUE)))
{
mysql_mutex_unlock(&acl_cache->lock);
my_message(ER_PASSWORD_NO_MATCH, ER(ER_PASSWORD_NO_MATCH), MYF(0));
goto end;
}
DBUG_ASSERT(acl_user->plugin.length != 0);
if (!(combo=(LEX_USER*) thd->alloc(sizeof(st_lex_user))))
DBUG_RETURN(1);
combo->user.str= user;
combo->host.str= host;
combo->user.length= strlen(user);
combo->host.length= strlen(host);
thd->make_lex_string(&combo->user,
combo->user.str, strlen(combo->user.str), 0);
thd->make_lex_string(&combo->host,
combo->host.str, strlen(combo->host.str), 0);
combo->plugin= EMPTY_CSTR;
combo->auth.str= new_password;
combo->auth.length= new_password_len;
combo->uses_identified_by_clause= true;
combo->uses_identified_with_clause= false;
combo->uses_identified_by_password_clause= false;
combo->uses_authentication_string_clause= false;
/* set default values */
thd->lex->ssl_type= SSL_TYPE_NOT_SPECIFIED;
memset(&(thd->lex->mqh), 0, sizeof(thd->lex->mqh));
thd->lex->alter_password.update_password_expired_column= false;
thd->lex->alter_password.use_default_password_lifetime= true;
thd->lex->alter_password.expire_after_days= 0;
thd->lex->alter_password.update_account_locked_column= false;
thd->lex->alter_password.account_locked= false;
thd->lex->alter_password.update_password_expired_fields= false;
/*
When @@log-backward-compatible-user-definitions variable is ON
and its a slave thread, then the password is already hashed. So
do not generate another hash.
*/
if (opt_log_builtin_as_identified_by_password &&
thd->slave_thread)
combo->uses_identified_by_clause= false;
if (set_and_validate_user_attributes(thd, combo, what_to_set, true))
{
result= 1;
mysql_mutex_unlock(&acl_cache->lock);
goto end;
}
ret= replace_user_table(thd, table, combo, 0, false, true, what_to_set);
if (ret)
{
mysql_mutex_unlock(&acl_cache->lock);
result= 1;
if (ret < 0)
rollback_whole_statement= true;
goto end;
}
if (!update_sctx_cache(thd->security_context(), acl_user, false) &&
thd->security_context()->password_expired())
{
/* the current user is not the same as the user we operate on */
my_error(ER_MUST_CHANGE_PASSWORD, MYF(0));
result= 1;
mysql_mutex_unlock(&acl_cache->lock);
goto end;
}
mysql_mutex_unlock(&acl_cache->lock);
result= 0;
/*
Based on @@log-backward-compatible-user-definitions variable
rewrite SET PASSWORD
*/
if (opt_log_builtin_as_identified_by_password)
{
memcpy(hash_str, combo->auth.str, combo->auth.length);
query_length= sprintf(buff, "SET PASSWORD FOR '%-.120s'@'%-.120s'='%s'",
acl_user->user ? acl_user->user : "",
acl_user->host.get_host() ? acl_user->host.get_host() : "",
hash_str);
}
else
query_length= sprintf(buff, "ALTER USER '%-.120s'@'%-.120s' IDENTIFIED WITH '%-.120s' AS '%s'",
acl_user->user ? acl_user->user : "",
acl_user->host.get_host() ? acl_user->host.get_host() : "",
acl_user->plugin.str,
acl_user->auth_string.str);
result= write_bin_log(thd, true, buff, query_length,
table->file->has_transactions());
end:
result|= acl_end_trans_and_close_tables(thd,
thd->transaction_rollback_request ||
rollback_whole_statement);
if (!result)
acl_notify_htons(thd, buff, query_length);
/* Restore the state of binlog format */
DBUG_ASSERT(!thd->is_current_stmt_binlog_format_row());
if (save_binlog_row_based)
thd->set_current_stmt_binlog_format_row();
DBUG_RETURN(result);
}
/**
Handle an in-memory privilege structure.
@param struct_no The number of the structure to handle (0..5).
@param drop If user_from is to be dropped.
@param user_from The the user to be searched/dropped/renamed.
@param user_to The new name for the user if to be renamed, NULL otherwise.
@note
Scan through all elements in an in-memory grant structure and apply
the requested operation.
Delete from grant structure if drop is true.
Update in grant structure if drop is false and user_to is not NULL.
Search in grant structure if drop is false and user_to is NULL.
Structures are enumerated as follows:
0 ACL_USER
1 ACL_DB
2 COLUMN_PRIVILIGES_HASH
3 PROC_PRIVILEGES_HASH
4 FUNC_PRIVILEGES_HASH
5 ACL_PROXY_USERS
@retval > 0 At least one element matched.
@retval 0 OK, but no element matched.
@retval -1 Wrong arguments to function or Out of Memory.
*/
static int handle_grant_struct(enum enum_acl_lists struct_no, bool drop,
LEX_USER *user_from, LEX_USER *user_to)
{
int result= 0;
size_t idx;
size_t elements;
const char *user= NULL;
const char *host= NULL;
ACL_USER *acl_user= NULL;
ACL_DB *acl_db= NULL;
ACL_PROXY_USER *acl_proxy_user= NULL;
GRANT_NAME *grant_name= NULL;
/*
Dynamic array acl_grant_name used to store pointers to all
GRANT_NAME objects
*/
Prealloced_array<GRANT_NAME *, 16> acl_grant_name(PSI_INSTRUMENT_ME);
HASH *grant_name_hash= NULL;
DBUG_ENTER("handle_grant_struct");
DBUG_PRINT("info",("scan struct: %u search: '%s'@'%s'",
struct_no, user_from->user.str, user_from->host.str));
mysql_mutex_assert_owner(&acl_cache->lock);
/* Get the number of elements in the in-memory structure. */
switch (struct_no) {
case USER_ACL:
elements= acl_users->size();
break;
case DB_ACL:
elements= acl_dbs->size();
break;
case COLUMN_PRIVILEGES_HASH:
elements= column_priv_hash.records;
grant_name_hash= &column_priv_hash;
break;
case PROC_PRIVILEGES_HASH:
elements= proc_priv_hash.records;
grant_name_hash= &proc_priv_hash;
break;
case FUNC_PRIVILEGES_HASH:
elements= func_priv_hash.records;
grant_name_hash= &func_priv_hash;
break;
case PROXY_USERS_ACL:
elements= acl_proxy_users->size();
break;
default:
DBUG_RETURN(-1);
}
#ifdef EXTRA_DEBUG
DBUG_PRINT("loop",("scan struct: %u search user: '%s' host: '%s'",
struct_no, user_from->user.str, user_from->host.str));
#endif
/* Loop over all elements. */
for (idx= 0; idx < elements; idx++)
{
/*
Get a pointer to the element.
*/
switch (struct_no) {
case USER_ACL:
acl_user= &acl_users->at(idx);
user= acl_user->user;
host= acl_user->host.get_host();
break;
case DB_ACL:
acl_db= &acl_dbs->at(idx);
user= acl_db->user;
host= acl_db->host.get_host();
break;
case COLUMN_PRIVILEGES_HASH:
case PROC_PRIVILEGES_HASH:
case FUNC_PRIVILEGES_HASH:
grant_name= (GRANT_NAME*) my_hash_element(grant_name_hash, idx);
user= grant_name->user;
host= grant_name->host.get_host();
break;
case PROXY_USERS_ACL:
acl_proxy_user= &acl_proxy_users->at(idx);
user= acl_proxy_user->get_user();
host= acl_proxy_user->host.get_host();
break;
default:
MY_ASSERT_UNREACHABLE();
}
if (! user)
user= "";
if (! host)
host= "";
#ifdef EXTRA_DEBUG
DBUG_PRINT("loop",("scan struct: %u index: %zu user: '%s' host: '%s'",
struct_no, idx, user, host));
#endif
if (strcmp(user_from->user.str, user) ||
my_strcasecmp(system_charset_info, user_from->host.str, host))
continue;
result= 1; /* At least one element found. */
if ( drop )
{
switch ( struct_no ) {
case USER_ACL:
acl_users->erase(idx);
elements--;
/*
- If we are iterating through an array then we just have moved all
elements after the current element one position closer to its head.
This means that we have to take another look at the element at
current position as it is a new element from the array's tail.
- This is valid for case USER_ACL, DB_ACL and PROXY_USERS_ACL.
*/
idx--;
break;
case DB_ACL:
acl_dbs->erase(idx);
elements--;
idx--;
break;
case COLUMN_PRIVILEGES_HASH:
case PROC_PRIVILEGES_HASH:
case FUNC_PRIVILEGES_HASH:
/*
Deleting while traversing a hash table is not valid procedure and
hence we save pointers to GRANT_NAME objects for later processing.
*/
if (acl_grant_name.push_back(grant_name))
DBUG_RETURN(-1);
break;
case PROXY_USERS_ACL:
acl_proxy_users->erase(idx);
elements--;
idx--;
break;
}
}
else if ( user_to )
{
switch ( struct_no ) {
case USER_ACL:
acl_user->user= strdup_root(&global_acl_memory, user_to->user.str);
acl_user->host.update_hostname(strdup_root(&global_acl_memory, user_to->host.str));
break;
case DB_ACL:
acl_db->user= strdup_root(&global_acl_memory, user_to->user.str);
acl_db->host.update_hostname(strdup_root(&global_acl_memory, user_to->host.str));
break;
case COLUMN_PRIVILEGES_HASH:
case PROC_PRIVILEGES_HASH:
case FUNC_PRIVILEGES_HASH:
/*
Updating while traversing a hash table is not valid procedure and
hence we save pointers to GRANT_NAME objects for later processing.
*/
if (acl_grant_name.push_back(grant_name))
DBUG_RETURN(-1);
break;
case PROXY_USERS_ACL:
acl_proxy_user->set_user(&global_acl_memory, user_to->user.str);
acl_proxy_user->host.update_hostname((user_to->host.str && *user_to->host.str) ?
strdup_root(&global_acl_memory, user_to->host.str) : NULL);
break;
}
}
else
{
/* If search is requested, we do not need to search further. */
break;
}
}
if (drop || user_to)
{
/*
Traversing the elements stored in acl_grant_name dynamic array
to either delete or update them.
*/