#At lp:maria 2834 knielsen@knielsen-hq.org 2010-05-09 Cherry-pick fix for Bug#53371, security hole with bypassing grants using special path in db/table names. Bump MariaDB version for security fix release. modified: configure.in mysql-test/r/grant.result mysql-test/t/grant.test sql/mysql_priv.h sql/partition_info.cc sql/sql_parse.cc sql/sql_table.cc sql/sql_yacc.yy sql/table.cc tests/mysql_client_test.c === modified file 'configure.in' --- a/configure.in 2010-04-29 07:57:25 +0000 +++ b/configure.in 2010-05-09 19:30:06 +0000 @@ -7,7 +7,7 @@ AC_PREREQ(2.59) # Remember to also update version.c in ndb. # When changing major version number please also check switch statement # in mysqlbinlog::check_master_version(). -AC_INIT([MariaDB Server], [5.1.44a-MariaDB], [], [mysql]) +AC_INIT([MariaDB Server], [5.1.44b-MariaDB], [], [mysql]) AC_CONFIG_SRCDIR([sql/mysqld.cc]) AC_CANONICAL_SYSTEM # USTAR format gives us the possibility to store longer path names in === modified file 'mysql-test/r/grant.result' --- a/mysql-test/r/grant.result 2010-01-29 10:42:31 +0000 +++ b/mysql-test/r/grant.result 2010-05-09 19:30:06 +0000 @@ -1413,3 +1413,19 @@ DROP USER 'user1'; DROP USER 'user1'@'localhost'; DROP USER 'user2'; DROP DATABASE db1; +CREATE DATABASE db1; +CREATE DATABASE db2; +GRANT SELECT ON db1.* to 'testbug'@localhost; +USE db2; +CREATE TABLE t1 (a INT); +USE test; +SELECT * FROM `../db2/tb2`; +ERROR 42S02: Table 'db1.../db2/tb2' doesn't exist +SELECT * FROM `../db2`.tb2; +ERROR 42000: SELECT command denied to user 'testbug'@'localhost' for table 'tb2' +SELECT * FROM `#mysql50#/../db2/tb2`; +ERROR 42S02: Table 'db1.#mysql50#/../db2/tb2' doesn't exist +DROP USER 'testbug'@localhost; +DROP TABLE db2.t1; +DROP DATABASE db1; +DROP DATABASE db2; === modified file 'mysql-test/t/grant.test' --- a/mysql-test/t/grant.test 2010-01-29 10:42:31 +0000 +++ b/mysql-test/t/grant.test 2010-05-09 19:30:06 +0000 @@ -1525,5 +1525,30 @@ DROP USER 'user1'@'localhost'; DROP USER 'user2'; DROP DATABASE db1; + +# +# Bug #53371: COM_FIELD_LIST can be abused to bypass table level grants. +# + +CREATE DATABASE db1; +CREATE DATABASE db2; +GRANT SELECT ON db1.* to 'testbug'@localhost; +USE db2; +CREATE TABLE t1 (a INT); +USE test; +connect (con1,localhost,testbug,,db1); +--error ER_NO_SUCH_TABLE +SELECT * FROM `../db2/tb2`; +--error ER_TABLEACCESS_DENIED_ERROR +SELECT * FROM `../db2`.tb2; +--error ER_NO_SUCH_TABLE +SELECT * FROM `#mysql50#/../db2/tb2`; +connection default; +disconnect con1; +DROP USER 'testbug'@localhost; +DROP TABLE db2.t1; +DROP DATABASE db1; +DROP DATABASE db2; + # Wait till we reached the initial number of concurrent sessions --source include/wait_until_count_sessions.inc === modified file 'sql/mysql_priv.h' --- a/sql/mysql_priv.h 2010-03-04 08:03:07 +0000 +++ b/sql/mysql_priv.h 2010-05-09 19:30:06 +0000 @@ -2300,7 +2300,7 @@ void update_create_info_from_table(HA_CR int rename_file_ext(const char * from,const char * to,const char * ext); bool check_db_name(LEX_STRING *db); bool check_column_name(const char *name); -bool check_table_name(const char *name, uint length); +bool check_table_name(const char *name, uint length, bool check_for_path_chars); char *get_field(MEM_ROOT *mem, Field *field); bool get_field(MEM_ROOT *mem, Field *field, class String *res); int wild_case_compare(CHARSET_INFO *cs, const char *str,const char *wildstr); === modified file 'sql/partition_info.cc' --- a/sql/partition_info.cc 2009-12-03 11:19:05 +0000 +++ b/sql/partition_info.cc 2010-05-09 19:30:06 +0000 @@ -972,7 +972,7 @@ bool partition_info::check_partition_inf part_elem->engine_type= default_engine_type; } if (check_table_name(part_elem->partition_name, - strlen(part_elem->partition_name))) + strlen(part_elem->partition_name), FALSE)) { my_error(ER_WRONG_PARTITION_NAME, MYF(0)); goto end; @@ -990,7 +990,7 @@ bool partition_info::check_partition_inf { sub_elem= sub_it++; if (check_table_name(sub_elem->partition_name, - strlen(sub_elem->partition_name))) + strlen(sub_elem->partition_name), FALSE)) { my_error(ER_WRONG_PARTITION_NAME, MYF(0)); goto end; === modified file 'sql/sql_parse.cc' --- a/sql/sql_parse.cc 2010-04-29 07:57:25 +0000 +++ b/sql/sql_parse.cc 2010-05-09 19:30:06 +0000 @@ -1334,6 +1334,11 @@ bool dispatch_command(enum enum_server_c system_charset_info, packet, db_length, thd->charset(), &dummy_errors); db_buff[db_length]= '\0'; + if (check_table_name(db_buff, db_length, FALSE)) + { + my_error(ER_WRONG_TABLE_NAME, MYF(0), db_buff); + break; + } table_list.alias= table_list.table_name= db_buff; if (!(fields= (char *) thd->memdup(wildcard, query_length + 1))) break; @@ -6298,7 +6303,7 @@ TABLE_LIST *st_select_lex::add_table_to_ DBUG_RETURN(0); // End of memory alias_str= alias ? alias->str : table->table.str; if (!test(table_options & TL_OPTION_ALIAS) && - check_table_name(table->table.str, table->table.length)) + check_table_name(table->table.str, table->table.length, FALSE)) { my_error(ER_WRONG_TABLE_NAME, MYF(0), table->table.str); DBUG_RETURN(0); === modified file 'sql/sql_table.cc' --- a/sql/sql_table.cc 2010-03-04 08:03:07 +0000 +++ b/sql/sql_table.cc 2010-05-09 19:30:06 +0000 @@ -434,7 +434,21 @@ uint tablename_to_filename(const char *f DBUG_PRINT("enter", ("from '%s'", from)); if ((length= check_n_cut_mysql50_prefix(from, to, to_length))) + { + /* + Check if the name supplied is a valid mysql 5.0 name and + make the name a zero length string if it's not. + Note that just returning zero length is not enough : + a lot of places don't check the return value and expect + a zero terminated string. + */ + if (check_table_name(to, length, TRUE)) + { + to[0]= 0; + length= 0; + } DBUG_RETURN(length); + } length= strconvert(system_charset_info, from, &my_charset_filename, to, to_length, &errors); if (check_if_legal_tablename(to) && === modified file 'sql/sql_yacc.yy' --- a/sql/sql_yacc.yy 2010-03-04 08:03:07 +0000 +++ b/sql/sql_yacc.yy 2010-05-09 19:30:06 +0000 @@ -6149,7 +6149,7 @@ alter_list_item: { MYSQL_YYABORT; } - if (check_table_name($3->table.str,$3->table.length) || + if (check_table_name($3->table.str,$3->table.length, FALSE) || ($3->db.str && check_db_name(&$3->db))) { my_error(ER_WRONG_TABLE_NAME, MYF(0), $3->table.str); === modified file 'sql/table.cc' --- a/sql/table.cc 2010-03-10 10:32:14 +0000 +++ b/sql/table.cc 2010-05-09 19:30:06 +0000 @@ -494,6 +494,19 @@ inline bool is_system_table_name(const c } +/** + Check if a string contains path elements +*/ + +static inline bool has_disabled_path_chars(const char *str) +{ + for (; *str; str++) + if (*str == FN_EXTCHAR || *str == '/' || *str == '\\' || *str == '~' || *str == '@') + return TRUE; + return FALSE; +} + + /* Read table definition from a binary / text based .frm file @@ -548,7 +561,8 @@ int open_table_def(THD *thd, TABLE_SHARE This kind of tables must have been opened only by the my_open() above. */ - if (strchr(share->table_name.str, '@') || + if (has_disabled_path_chars(share->table_name.str) || + has_disabled_path_chars(share->db.str) || !strncmp(share->db.str, MYSQL50_TABLE_NAME_PREFIX, MYSQL50_TABLE_NAME_PREFIX_LENGTH) || !strncmp(share->table_name.str, MYSQL50_TABLE_NAME_PREFIX, @@ -2718,7 +2732,6 @@ bool check_db_name(LEX_STRING *org_name) (name_length > NAME_CHAR_LEN)); /* purecov: inspected */ } - /* Allow anything as a table name, as long as it doesn't contain an ' ' at the end @@ -2726,7 +2739,7 @@ bool check_db_name(LEX_STRING *org_name) */ -bool check_table_name(const char *name, uint length) +bool check_table_name(const char *name, uint length, bool check_for_path_chars) { uint name_length= 0; // name length in symbols const char *end= name+length; @@ -2753,6 +2766,9 @@ bool check_table_name(const char *name, continue; } } + if (check_for_path_chars && + (*name == '/' || *name == '\\' || *name == '~' || *name == FN_EXTCHAR)) + return 1; #endif name++; name_length++; === modified file 'tests/mysql_client_test.c' --- a/tests/mysql_client_test.c 2010-01-11 13:15:28 +0000 +++ b/tests/mysql_client_test.c 2010-05-09 19:30:06 +0000 @@ -18092,6 +18092,50 @@ static void test_bug44495() DBUG_VOID_RETURN; } +static void test_bug53371() +{ + int rc; + MYSQL_RES *result; + + myheader("test_bug53371"); + + rc= mysql_query(mysql, "DROP TABLE IF EXISTS t1"); + myquery(rc); + rc= mysql_query(mysql, "DROP DATABASE IF EXISTS bug53371"); + myquery(rc); + rc= mysql_query(mysql, "DROP USER 'testbug'@localhost"); + + rc= mysql_query(mysql, "CREATE TABLE t1 (a INT)"); + myquery(rc); + rc= mysql_query(mysql, "CREATE DATABASE bug53371"); + myquery(rc); + rc= mysql_query(mysql, "GRANT SELECT ON bug53371.* to 'testbug'@localhost"); + myquery(rc); + + rc= mysql_change_user(mysql, "testbug", NULL, "bug53371"); + myquery(rc); + + rc= mysql_query(mysql, "SHOW COLUMNS FROM client_test_db.t1"); + DIE_UNLESS(rc); + DIE_UNLESS(mysql_errno(mysql) == 1142); + + result= mysql_list_fields(mysql, "../client_test_db/t1", NULL); + DIE_IF(result); + + result= mysql_list_fields(mysql, "#mysql50#/../client_test_db/t1", NULL); + DIE_IF(result); + + rc= mysql_change_user(mysql, opt_user, opt_password, current_db); + myquery(rc); + rc= mysql_query(mysql, "DROP TABLE t1"); + myquery(rc); + rc= mysql_query(mysql, "DROP DATABASE bug53371"); + myquery(rc); + rc= mysql_query(mysql, "DROP USER 'testbug'@localhost"); + myquery(rc); +} + + /* Read and parse arguments and MySQL options from my.cnf */ @@ -18401,6 +18445,7 @@ static struct my_tests_st my_tests[]= { { "test_bug30472", test_bug30472 }, { "test_bug20023", test_bug20023 }, { "test_bug45010", test_bug45010 }, + { "test_bug53371", test_bug53371 }, { "test_bug31418", test_bug31418 }, { "test_bug31669", test_bug31669 }, { "test_bug28386", test_bug28386 },