Sunday, March 20, 2011

LDAP Authentication in WebSphere

1. A request arrives on an input channel (for example, Web or EJB).
2. The authentication data is passed through the authentication modules.
3. This flow highlights the WebSphere Application Server default trust
association interceptor (TAI) for LTPA token. LTPA is the application server’s
default and the recommended trust token implementation. Trust is asserted at
this stage of the processing. If the token is determined valid, the user
information that it contains is trusted and the identity of the user is asserted.
4. After token processing, the user credentials are

rebuilt from the information that is retrieved from the token.
5. User credentials are created based on user information retrieved from the
registry.
6. The credential is forwarded as the request is processed by different
architectural tiers of the application server.

How to Turnoff Security for WebSphere Admin console

If you are unable to authenticate, you can turn off security to help
troubleshoot the problem by running the following wsadmin commands
(command in jacl format). You must run this command locally; it cannot be
executed remotely.
Executed from /bin directory where is the profile’s install
directory.
wsadmin -conntype NONE
WASX7357I: By request, this scripting client is not connected to any
server process. Certain configuration and application operations
will be available in local mode.
WASX7029I: For help, enter: "$Help help"
wsadmin>securityoff
LOCAL OS security is off now but you need to restart server1 to make
it affected.
wsadmin>$AdminConfig save
wsadmin>exit
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WAS_INSTALL_DIR/profiles/<profileName>/config/cells/<cellName>/
and open the file security.xml. Search for a tag name
<security:Security.
This would be the first tag in security.xml file. In this tag we can see an attribute called
enabled="true"
Just change the value to false. Save the file and restart the server. Security will be disabled on the server.
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WAS Admin Security

WebSphere Security.

Configuring security with scripting

You can configure security with scripting and the wsadmin tool.

Before you begin

Before starting this task, the wsadmin tool must be running. See the Starting the wsadmin scripting client article for more information.

About this task

If you enable security for a WebSphere Application Server cell, supply authentication information to communicate with servers. The sas.client.props and the soap.client.props files are located in the following properties directory for each WebSphere Application Server profile:

Procedure

  • The nature of the properties file updates required for running in secure mode depend on whether you connect with a Remote Method Invocation (RMI) connector, or a SOAP connector:
    • If you use a Remote Method Invocation (RMI) connector, set the following properties in thesas.client.props file with the appropriate values:
o                     com.ibm.CORBA.loginUserid=
com.ibm.CORBA.loginPassword=
Also, set the following property:
com.ibm.CORBA.loginSource=properties
The default value for this property is prompt in the sas.client.props file. If you leave the default value, a dialog box appears with a password prompt. If the script is running unattended, it appears to hang.
    • If you use a SOAP connector, set the following properties in the soap.client.props file with the appropriate values:
o                     com.ibm.SOAP.securityEnabled=true
o                     com.ibm.SOAP.loginUserid=
com.ibm.SOAP.loginPassword=
Optionally, set the following property:
com.ibm.SOAP.loginSource=none
The default value for this property is prompt in the soap.client.props file. If you leave the default value, a dialog box appears with a password prompt. If the script is running unattended, it appears to hang.
  • Specify user and password information. Choose one of the following methods:
    • Specify user name and password on a command line, using the -user and -passwordcommands. For example:
wsadmin -conntype RMI -port 2809 -user u1 -password secret1
    • Specify user name and password in the sas.client.props file for a RMI connector or thesoap.client.props file for a SOAP connector.
If you specify user and password information on a command line and in the sas.client.props file or thesoap.client.props file, the command line information overrides the information in the props file.
Note: The use of -password option may result in security exposure as the password information becomes visible to the system status program such as ps command which can be invoked by other user to display all the running processes. Do not use this option if security exposure is a concern. Instead, specify user and password information in the soap.client.props file for SOAP connector or sas.client.props file for RMI connector. The soap.client.props and sas.client.props files are located in the properties directory of your WebSphere Application Server profile
To run any command without exposing the password in the command line, use the below format command for any operation through shell.
WAS-TEST:/opt/IBM/WebSphere/AppServer/profiles/Dmgr01/bin #./stopManager.sh -conntype SOAP
ADMU0116I: Tool information is being logged in file
/opt/IBM/WebSphere/AppServer/profiles/Dmgr01/logs/dmgr/stopServer.log
ADMU0128I: Starting tool with the Dmgr01 profile
ADMU3100I: Reading configuration for server: dmgr
ADMU3201I: Server stop request issued. Waiting for stop status.
ADMU4000I: Server dmgr stop completed.
Example: Enabling and disabling Java 2 security using wsadmin
An example of enabling and disabling Java 2 security follows:
  • Identify the security configuration object and assign it to the security variable:
Using Jacl:
set security [$AdminConfig list Security]
An example of this output follows:
(cells/mycell:security.xml#Security_1)
[Version 5.1 and later]Using Jython:
security = AdminConfig.list('Security')
print security
  • Modify the enforceJava2Security attribute.
To enable Java 2 security:
Using Jacl:
$AdminConfig modify $security {{enforceJava2Security true}}
[Version 5.1 and later]Using Jython:
AdminConfig.modify(security, [['enforceJava2Security', 'true']])
To disable Java 2 security:
Using Jacl:
$AdminConfig modify $security {{enforceJava2Security false}}
[Version 5.1 and later]Using Jython:
AdminConfig.modify(security, [['enforceJava2Security', 'false']])
  • Save the changes with the following command:
Using Jacl:
$AdminConfig save
[Version 5.1 and later]Using Jython:
AdminConfig.save()

IF the security has to be disabled through wsadmin:

Enforce Java 2 Security
Specifies whether to enable or disable Java 2 Security permission checking. By default, Java 2 security is disabled. However, if you enabled global security, this automatically enables Java 2 security. You can choose to disable Java 2 security, even when global security is enabled.
When Java 2 Security is enabled and if an application requires more Java 2 security permissions then are granted in the default policy, then the application might fail to run properly until the required permissions are granted in either the app.policy file or the was.policy file of the application. AccessControl exceptions are generated by applications that do not have all the required permissions. Consult the InfoCenter and review the Java 2 Security and Dynamic Policy sections if you are unfamiliar with Java 2 security.
If your server does not restart after you enable global security, you can disable security. Go to your${was_install_root}\bin directory.
Excecute the command wsadmin -conntype NONE.
At the wsadmin> prompt, enter securityoff.
Type exit to get back to a command prompt.
Now you should be able to start the server again, with security disabled. This enables you to check what might not be set correctly through the administrative console.
Data type
Boolean
Default
Disabled
Range
Enabled or Disabled

Basic Linux commands

IFCONFIG : It is used to display the IP address and configure Kernal-
resident network.
Syntax: ifconfig

Kill -9: To terminate or kill the process in Linux we use the kill command
Syntax: kill -9 pid#

Kill -3: It is used to take thread dumps on Linux platforms.
Syntax: kill -3

Tail: The tail command displays the last few lines of a file. By default, tail will
show the last 10 lines of a file.
Syntax: tail filename
Syntax: tail –n filename
Where n is number of lines

Head: The Head command displays the first few lines of a file. By default,
Head will show the first 10 lines of a file.
Syntax: Head filename
Syntax: Head –N filename
Where N is number of lines

Top: It is used to show CPU consumption, RAM memory consumption and
the top sessions on a Linux server.
Syntax: root> top
Cpu status:
CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS

VMSTAT: The VMSTAT displays various server values over given time
interval. It is invoked from UNIX prompt, and it has several numeric
parameters.
The first numeric argument to VMSTAT represents the time interval
[expressed in seconds] between server samples. The second argument specifies
the number of samples to be reported
Syntax: root> vmstat [first argument] [second argument]
Ex: root> vmstat 2 2

DU: It displays the disk usage for all directories and subdirectories under the
current directory.
Syntax: du
DF: It displays the disk space free on each file system. It is very useful.
Syntax: df -m results in megabytes
df -k results in kilobytes
df –h results in gigabytes

PS: It displays the current process information.
Syntax: root> ps
root> ps –ef | grep –i java
LS –ltr: It list the files and directories with complete description
Syntax: root> ls –ltr
PWD: It displays the present working directory.
Syntax: root> pwd

Free: This command is used to quickly display the amount of RAM memory
on the server.
Syntax: root> free

UMASK: This command can be used to read or set default file permissions for
the current user.
Syntax: root> umask 022
• the umask value is subtracted from the default permissions(666) to give
the final permissions.
666 : Default permission
022 : - umask value


644 : Final permission

CHMOD: This command is used to alter the file permissions after the file has
been created.
Syntax: root> chmod 777 *.log

Owner
=======
7 (u+rwx)
6 (u+wx)
5 (u+rx)

Group
=======
7 (g+rwx)
6 (g+wx)
5 (g+rx)

World
=====
7 (o+rwx)
6 (o+wx)
5 (o+rx)

Permission
=========
read + write + execute
write + execute
read + execute

VI Editor: Vi editor is modifying, coping, deleting and adding
Syntax: VI filename
i is the command to insert the data
a is the command append the data
:w it is for saving
:q we need to quit from vi editor
:wq we need to save and quit from vi editor
:q! Forcefully quitting from vi editor without saving

Rm: Rm is a command to remove a file
Syntax: rm[options] file/dir
Ex: rm file1

Rm dir : it can delete dir
Rm –r dir1: Before delete it will ask I am gong to delete or not
Rm –rf dir1: It will delete the dir1 forcefully without asking

CHOWN: This command is used to change the ownership of files after
creation. The “-R” flag causes the command to recurse through subdirectories.
Syntax: root> chown –R oinstall.dba *

CP: This command is used to copy files and directories
Syntax: root> cp [from] [to]
Ex: cp file1 file2
SCP: It will copy the files from one server to another server
Syntax:
USERADD: The useradd command is used add the OS users
Syntax:root> useradd -G oinstall –g dba –d
/user/users/
my_user –m –s /bin/ksh my_user

NETSTAT: It is useful for checking the network configuration and activity. It
is in fact a collection several tools lumped together

The –n flag makes netstat print addresses as dotted quad IP numbers
rather than the symbolic host and network names.
The –r flag displays the kernel routing table in the way we have been
doing with route.
The –i flag displays statistics for the network interfaces currently
configured.
The –a flag by itself will display all sockets from all families

Tar: Tar command is used to create tape archives and add or extract the files
Creating tar file: tar –cvvf file.tar myfile.txt
Extracting the files from tar file:
1) tar –xvvf : This command is used to uncompresse(untar)
the file.
Ex: tar –xvvf myfile.txt
2) tar –xvzf : This command is used to extract the file
Ex: tar –xnzf myfile .txt
NSLOOKUP:
Nslookup [-option….] [host-to-find [server name]]
It is program to query Internet domain name servers. Nslookup has two
modes:
1. Interactive: It allows the user to query name servers for
information about various hosts and domains or to print a list of
hosts in a domain.
2. Non-interactive: It is used to print just the name and requested
information for a host or domain.

Interactive mode is entered in the following cases:
a) when no arguments are given(the default name server will be used)
b) when the first argument is hyphen (-) and the second argument is the
host name or internet address of a name server.