how to generate barcode in visual basic 2010 s I recommend you use a password age between 30 60 days for most passwords depending on the Tip in Font

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Two ways exist to handle password aging. The first uses the command-line tool chage to set or change the password expiry of a user account individually. Listing 1-29 shows this command working. Listing 1-29. The chage Command puppy# chage -M 30 bob Listing 1-29 uses the -M option to set the password expiry period for the user bob to 30 days. Table 1-7 shows several other variables you can set. Table 1-7. Command-Line Options for the chage Command
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-m days -M -E -W days -d days -I days
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Sets the minimum number of days between password changes. Zero allows the user to change it at any time. Sets the maximum number of days for which a password stays valid. Sets a date on which the user account will expire and automatically be deactivated. Sets the number of days before the password expires that the user will be warned to change it. Sets the number of days since Jan. 1, 1970, that the password was last changed. Sets the number of days after password expiry that the account is locked.
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First, the -m option allows you to specify the minimum amount of time between password changes. A setting of 0 allows the user to change the password at any time. Second, the next option, -W, specifies the number of days before a user s password expires that they will get a warning that their password is about to expire. The -d option is principally useful to immediately expire a password. By setting the -d option to 0, the user s last password change date becomes Jan. 1, 1970, and if the -M option is greater than 0, then the user must change their password at the next login. The last option, -I, provides a time frame in days after which user accounts with expired and unchanged passwords are locked and thus unable to be used to log in. If you run chage without any options and specify only the user, then it will launch an interactive series of prompts to set the required values. Listing 1-30 shows this. The values between the [ ] brackets indicate the current values to which this user s password aging is set. Listing 1-30. Running chage Without Options puppy# chage bob Changing the aging information for bob Enter the new value, or press return for the default Minimum Password Age [0]: Maximum Password Age [30]: Last Password Change (YYYY-MM-DD) [2004-06-27]: Password Expiration Warning [7]: Password Inactive [-1]: Account Expiration Date (YYYY-MM-DD) [2004-07-28]:
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Users can also utilize the chage command with the -l option to show when a password is due to expire. puppy# chage -l bob The other method to handle password aging is to set defaults for all users in the /etc/login.defs file.
s The /etc/login.defs file is used to also control password lengths. On both Debian and Red Hat Tip
(and other distributions), PAM has taken over this function.
Listing 1-31 shows the controls available for password aging in /etc/login.defs. Listing 1-31. The login.defs Password-Aging Controls PASS_MAX_DAYS PASS_MIN_DAYS PASS_WARN_AGE 60 0 7
As you can see, you can set the core password-aging controls here, and I have set the maximum password age to 60 days, allowing users to change their passwords at any time and providing a warning to users that their passwords will expire seven days before password expiry.
sudo
One of the first things most system administrators are told is not to use the root user to perform activities that do not require it. This is inconvenient for administration purposes but greatly enhances the security of the system. This enhancement reduces the risk of the root user being compromised or used by unauthorized people and the risk of accidental misuse of the root user privileges. One of the ways you can reduce the inconvenience this causes whilst not increasing the security exposure is to use the sudo function, which is a variation on the su function. I will cover securing this in the Pluggable Authentication Modules (PAM) section. The sudo function allows selected non-root users to execute particular commands as if they were root. The sudo command is a setuid binary that is owned by root to which all users have execute permissions. If you are authorized to do so, you can run sudo and effectively become the root user. sudo is a complicated package, and I will take you through the basics of configuring it.
s Note Most distributions come with sudo installed, but you may need to install it. On both Debian and
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