pam_unix2
pam_unix2
NAMEDESCRIPTION
OPTIONS
FILES
SEE ALSO
NAME
pam_unix2 - Standard PAM module for traditional password authentication
DESCRIPTION
The pam_unix2 PAM module is for traditional password authentication. It uses standard calls from the glibc NSS libraries to retrieve and set account information as well as authentication. Usually this is obtained from the the local files /etc/passwd and /etc/shadow or from a NIS map.
The options can be added in the PAM configuration files for every single service. /etc/default/passwd defines, which password encryption algorithm should be used in case of a password change.
If a user matches an entry in /etc/security/uname26.conf and a kernel 3.0 or newer is running, the kernel version number will be changed for this session to 2.6.40. Every line of that config file is an own entry in regexec(3p) format.
OPTIONS
The following options may be passed to all types of management groups except session:
|
debug |
A lot of debug informations are printed with syslog(3). | ||
|
nullok |
Normally the account is disabled if no password is set or if the length of the password is zero. With this option the user is allowed to change the password for such accounts. This option does not overwrite a hardcoded default by the calling process. |
use_first_pass
The default is, that pam_unix2 tries to get the authentication token from a previous module. If no token is available, the user is asked for the old password. With this option, pam_unix2 aborts with an error if no authentication token from a previous module is available.
The following
additional options may be passed to the passwd rules
of this modules:
nisdir=<path>
This options specifies a path to the source files for NIS maps on a NIS master server. If this option is given, the passwords of NIS accounts will not be changed with yppasswd(1), instead the local passwd and shadow files below <path> will be modified. In conjunction with rpasswdd(8) and pam_make rpc.yppasswdd(8) can be replaced with a more secure solution on the NIS master server.
use_authtok
Set the new password to the one provided by the previously stacked password module. If this option is not set, pam_unix2 would ask the user for the new password.
One of the following options may be passed to the session rules of this modules:
|
debug |
Some messages (login time, logout time) are logged to syslog with priority LOG_DEBUG. | ||
|
trace |
Some messages (login time, logout time) are logged to syslog with priority LOG_NOTICE. | ||
|
none |
No messages are logged. This is the default. |
The acct management does not recognize any additional options. For root, password and login expire are ignored, only on aging warning is printed. If no shadow information exists, it always returns success.
FILES
/etc/default/passwd
SEE ALSO
login(1), passwd(1), pam.conf(5), pam.d(8), pam_pwcheck(8), pam(8), rpasswd(1), rpasswdd(8), rpc.yppasswdd(8), yppasswd(1)
Opportunity
Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.
Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.
Free Software
Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.
Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.
Free Books
The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.
Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.
Education
Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.
Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.
