rdlc gs1 128

rdlc ean 128

rdlc gs1 128

rdlc gs1 128

rdlc ean 128

rdlc ean 128,
rdlc ean 128,

rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,

rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,

rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc ean 128,
rdlc ean 128,
rdlc ean 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,
rdlc gs1 128,

As a practical example of a transform, let A and B be classes that contain complementary algorithms to read and write data in a file. Class A contains the write algorithm, while B contains the read algorithm. The system has one unit of ALC, because A s write algorithm is coupled to one algorithm in B (or, using B s perspective, B s reader algorithm is coupled to one algorithm in A). Although logical coupling is mutual, a single instance of logic coupling has the value 1 (and not 2). Figure 1-39 shows the coupling diagram for A and B.

As you learned in 11, you should always use a password for the listener to prevent unauthorized users from preventing connections to the database. Once you set a password for the listener, privileged actions such as shutting down or starting up the listener can t be performed unless you provide the right password. You can also prevent a user from using the SET command to interfere with listener functions. To do this, you need to add the following line to your listener.ora configuration file: ADMIN_RESTRICTIONS=ON By default, this parameter is set to false. You should also avoid remote management of the listener service, as its password isn t encrypted over the network. The listener password is stored in the listener.ora file, so you must safeguard this file.

One of the basic security requirements for today s Internet-based database applications is that you must have a firewall protecting your system from the external world. Once you have a firewall in place, keep it secure by not poking holes in it for any reason, such as by using the ports used by the listener to connect to the Internet. In addition to having a normal firewall, you can use a feature of Oracle Net to add an additional layer of protection called server-side access controls. Server-side access controls limit the capability of an address to connect to your database using the listener service. There are two ways to limit the addresses through which connections can be made. You can list either the invited (accepted) address or the excluded addresses in the sqlnet.ora file. All network addresses in the invited list are allowed to connect, and all addresses in the excluded nodes list are denied access. When the listener service starts, it reads the sqlnet.ora file and provides access according to the access controls you specified. Here are the additions that you need to make to your sqlnet.ora file to enforce server-side access controls if you are specifying the invited addresses:

A +WriteFile()

tcp.validnode_checking = yes tcp.invited_nodes = (server1.us.wowcompany.com, 172.14.16.152) Here is what you need to add if you are excluding addresses: tcp.excluded_nodes = (server1.us.wowcompany.com, 172.14.16.152)

In general, because it s more likely that you know the addresses that are going to connect to your database, using the TCP_INVITED_NODES parameter may be the best way to limit access to your system.

As you learned earlier in this chapter, letting remote clients authenticate logins is unsafe, and you should always let the server authenticate clients connecting to your database. You can turn clientbased operating system authentication off by setting the following parameter in your init.ora file: REMOTE_OS_AUTHENT=FALSE The preceding setting will force server authentication of users, which is more secure than trusting the clients to perform operating system authentication.

B +ReadFile()

In addition to the SEC_CASE_SENSITIVE_LOGON initialization parameter, you can also use the following parameters to enforce database security: sec_protocol_error_further_action: Enables you to specify what the database must do (drop the connection or continue) when it receives bad network packets from clients, with the underlying presumption that those packets are being sent with malicious intent. sec_protocal_error_trace_action: Enables you to specify the kind of action to take in order to trace an error. For example, you may want to trace an error or send out an alert following an error. sec_max_failed_login_attempts: Lets you specify the maximum number of consecutive unsuccessful attempts a user can make and remains in force even if you choose not to enable a password profile for the user. ldap_directory_sysauth: Enables strong authentication (authentication that uses Kerberos tickets or certificates over a Secure Sockets Layer).