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Filename : mysql-cis.audit
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require("tab")

TEMPLATE_NAME="CIS MySQL Benchmarks v1.0.2"

-- These accounts should be treated as admins and excluded from some of the results
ADMIN_ACCOUNTS={"root", "debian-sys-maint"}

-- Checks whether a resultset is empty or not
local function isEmpty(rows) 
	if ( #rows > 0 ) then return false end
	return true
end

-- Extracts a column from a row and return all occurances as an array
local function col2tab(rs, cname)
	local tab = {}
	local cpos
	for i=1, #rs.cols do
		if ( rs.cols[i].name == cname ) then
			cpos = i
			break
		end
	end
	if ( not(cpos) ) then
		return
	end
	for _, row in ipairs(rs.rows) do table.insert(tab, row[cpos]) end
	return tab
end

local function createINstmt(tab)
	local tab2 = {}
	for i=1, #tab do tab2[i] = ("'%s'"):format(tab[i]) end
	return stdnse.strjoin(",", tab2)
end


-- This next section contains all the tests

-- Logging
test { id="3.1", desc="Skip symbolic links", sql="SHOW variables WHERE Variable_name = 'log_error' AND Value IS NOT NULL", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="3.2", desc="Logs not on system partition", sql="SHOW variables WHERE Variable_name = 'log_bin' AND Value <> 'OFF'", check=function(rowstab)
	local log = col2tab(rowstab[1], 'Value')
	return { status = isEmpty(rowstab[1]), result = log, review = not(isEmpty(rowstab[1])) }
end 
}

test { id="3.2", desc="Logs not on database partition", sql="SHOW variables WHERE Variable_name = 'log_bin' AND Value <> 'OFF'", check=function(rowstab)
	local log = col2tab(rowstab[1], 'Value')
	return { status = isEmpty(rowstab[1]), result = log, review = not(isEmpty(rowstab[1])) }
end 
}


-- General
test { id="4.1", desc="Supported version of MySQL", sql="SHOW VARIABLES like 'version'", check=function(rowstab) 
	local ver = col2tab(rowstab[1], 'Value')[1]
 	return { status = true, review = true, result = ("Version: %s"):format(ver) } 
end 
}

test { id="4.4", desc="Remove test database", sql="SHOW DATABASES like 'test'", check=function(rowstab) return { status = isEmpty(rowstab[1]) } end  }

test { id="4.5", desc="Change admin account name", sql="SELECT user FROM mysql.user WHERE user='root';", check=function(rowstab) return { status = isEmpty(rowstab[1]) } end }

test { id="4.7", desc="Verify Secure Password Hashes", sql="SELECT DISTINCT user, password from mysql.user where length(password) < 41 AND length(password) > 0", check=function(rowstab)
	local users = col2tab(rowstab[1], 'user')
	users.name = ( #users > 0 ) and "The following users were found having weak password hashes"
	return { status = isEmpty(rowstab[1]), result = users }
end 
}

test { id="4.9", desc="Wildcards in user hostname", sql="select user from mysql.user where host = '%'", check=function(rowstab)
	local users = col2tab(rowstab[1], 'user')
	users.name = ( #users > 0 ) and "The following users were found with wildcards in hostname"
	return { status = isEmpty(rowstab[1]), result = users }
end 
}

test { id="4.10", desc="No blank passwords", sql="select distinct user, password from mysql.user where length(password) = 0 or password is null", check=function(rowstab)
	local users = col2tab(rowstab[1], 'user')
	users.name = ( #users > 0 ) and "The following users were found having blank/empty passwords"
	return { status = isEmpty(rowstab[1]), result = users }
end 
}

test { id="4.11", desc="Anonymous account", sql="select distinct user from mysql.user where user =''", check=function(rowstab) return { status = isEmpty(rowstab[1]) } end }


-- MySQL Permissions
test { id="5.1", desc="Access to mysql database", 
	sql = { "SELECT user, host FROM mysql.db WHERE db = 'mysql' and ((Select_priv = 'Y') or (Insert_priv = 'Y') " ..
			"or (Update_priv = 'Y') or (Delete_priv = 'Y') or (Create_priv = 'Y') or (Drop_priv = 'Y'))",
			"SELECT user, host FROM mysql.user WHERE (Select_priv = 'Y') or (Insert_priv = 'Y') or " ..
			"(Update_priv = 'Y') or (Delete_priv = 'Y') or (Create_priv = 'Y') or (Drop_priv = 'Y')" },
	check = function(rowstab)
		
		local result = tab.new(2)
		tab.addrow(result, "user", "host")
		
		local rs = rowstab[1]
		for _, row in ipairs(rs.rows) do
			tab.addrow( result, row[1], row[2] )
		end
		
		return { status = false, review = true, result = { tab.dump(result), name="Verify the following users that have access to the MySQL database" } }
	end
}

test { id="5.2", desc="Do not grant FILE privileges to non Admin users", 
	sql=("SELECT user, host FROM mysql.user WHERE File_priv = 'Y' AND user NOT IN (%s)"):format(createINstmt(ADMIN_ACCOUNTS)), 
	check=function(rowstab)
		local users = col2tab(rowstab[1], 'user')
		users.name = ( #users > 0 ) and "The following users were found having the FILE privilege"
		return { status = isEmpty(rowstab[1]), result = users, review = not(isEmpty(rowstab[1])) }
	end
}

test { id="5.3", desc="Do not grant PROCESS privileges to non Admin users",
	sql=("SELECT user, host FROM mysql.user WHERE Process_priv = 'Y' AND user NOT IN (%s)"):format(createINstmt(ADMIN_ACCOUNTS)), 
	check=function(rowstab) 
		local users = col2tab(rowstab[1], 'user')
		users.name = ( #users > 0 ) and "The following users were found having the PROCESS privilege"
		return { status = isEmpty(rowstab[1]), result = users, review = not(isEmpty(rowstab[1])) }
	end
}

test { id="5.4", desc="Do not grant SUPER privileges to non Admin users", 
	sql=("SELECT user, host FROM mysql.user WHERE Super_priv = 'Y' AND user NOT IN (%s)"):format(createINstmt(ADMIN_ACCOUNTS)),
	check=function(rowstab) 
		local users = col2tab(rowstab[1], 'user')
		users.name = ( #users > 0 ) and "The following users were found having the SUPER privilege"
		return { status = isEmpty(rowstab[1]), result = users, review = not(isEmpty(rowstab[1])) }
	end 
}

test { id="5.5", desc="Do not grant SHUTDOWN privileges to non Admin users",
	sql=("SELECT user, host FROM mysql.user WHERE Shutdown_priv = 'Y' AND user NOT IN (%s)"):format(createINstmt(ADMIN_ACCOUNTS)),
	check=function(rowstab) 
		local users = col2tab(rowstab[1], 'user')
		users.name = ( #users > 0 ) and "The following users were found having the SHUTDOWN privilege"
		return { status = isEmpty(rowstab[1]), result = users, review = not(isEmpty(rowstab[1])) }
	end
}

test { id="5.6", desc="Do not grant CREATE USER privileges to non Admin users",
	sql=("SELECT user, host FROM mysql.user WHERE Create_user_priv = 'Y' AND user NOT IN (%s)"):format(createINstmt(ADMIN_ACCOUNTS)),
	check=function(rowstab) 
		local users = col2tab(rowstab[1], 'user')
		users.name = ( #users > 0 ) and "The following users were found having the CREATE USER privilege"
		return { status = isEmpty(rowstab[1]), result = users, review = not(isEmpty(rowstab[1])) }
	end
}

test { id="5.7", desc="Do not grant RELOAD privileges to non Admin users",
	sql=("SELECT user, host FROM mysql.user WHERE Reload_priv = 'Y' AND user NOT IN (%s)"):format(createINstmt(ADMIN_ACCOUNTS)),
	check=function(rowstab) 
		local users = col2tab(rowstab[1], 'user')
		users.name = ( #users > 0 ) and "The following users were found having the RELOAD privilege"
		return { status = isEmpty(rowstab[1]), result = users, review = not(isEmpty(rowstab[1])) }
	end 
}

test { id="5.8", desc="Do not grant GRANT privileges to non Admin users",
	sql=("SELECT user, host FROM mysql.user WHERE Grant_priv = 'Y' AND user NOT IN (%s)"):format(createINstmt(ADMIN_ACCOUNTS)),
	check=function(rowstab) 
		local users = col2tab(rowstab[1], 'user')
		users.name = ( #users > 0 ) and "The following users were found having the GRANT privilege"
		return { status = isEmpty(rowstab[1]), result = users, review = not(isEmpty(rowstab[1])) }
	end 
}


-- MySQL Configuraiton options
test { id="6.2", desc="Disable Load data local", sql="SHOW variables WHERE Variable_name = 'local_infile' AND Value='OFF'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.3", desc="Disable old password hashing", sql="SHOW variables WHERE Variable_name = 'old_passwords' AND Value='OFF'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.4", desc="Safe show database", sql="SHOW variables WHERE Variable_name = 'safe_show_database' AND Value='ON'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.5", desc="Secure auth", sql="SHOW variables WHERE Variable_name = 'secure_auth' AND Value='ON'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.6", desc="Grant tables", sql="SHOW variables WHERE Variable_name = 'skip_grant_tables' AND Value='OFF'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.7", desc="Skip merge", sql="SHOW variables WHERE Variable_name = 'have_merge_engine' AND Value='DISABLED'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.8", desc="Skip networking", sql="SHOW variables WHERE Variable_name = 'skip_networking' AND Value='ON'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.9", desc="Safe user create", sql="select @@global.sql_mode, @@session.sql_mode FROM dual WHERE @@session.sql_mode='NO_AUTO_CREATE_USER' AND @@global.sql_mode='NO_AUTO_CREATE_USER'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}

test { id="6.10", desc="Skip symbolic links", sql="SHOW variables WHERE Variable_name = 'have_symlink' AND Value='DISABLED'", check=function(rowstab) 
	return { status = not(isEmpty(rowstab[1])) }
end 
}