Free openvpn auth passwd software for linux

OpenVPN Admin is a GUI for OpenVPN it is writen in Mono and runs under Linux and Windows.

Included in OpenVPN-Admin is a Certificate wizard and a certificate management for the client.

OpenVPN is a full-featured SSL VPN solution which can accomodate a wide range of configurations, including remote access, site-to-site VPNs, WiFi security, and enterprise-scale remote access solutions with load balancing, failover, and fine-grained access-controls (articles) (examples) (security overview) (non-english languages).
OpenVPN implements OSI layer 2 or 3 secure network extension using the industry standard SSL/TLS protocol, supports flexible client authentication methods based on certificates, smart cards, and/or 2-factor authentication, and allows user or group-specific access control policies using firewall rules applied to the VPN virtual interface. OpenVPN is not a web proxy and does not operate through a web browser.
For a good conceptual introduction to OpenVPN, see the program notes for James Yonans talk at Linux Fest Northwest 2004 -- Understanding the User-Space VPN: History, Conceptual Foundations, and Practical Usage. See also OpenVPN and the SSL VPN Revolution by Charlie Hosner.
OpenVPN is an Open Source project and is licensed under the GPL. Commercial licenses are also available for firms who would like to redistribute OpenVPN with their own proprietary applications. Contact info@openvpn.net for more information.
Main features:
- tunnel any IP subnetwork or virtual ethernet adapter over a single UDP or TCP port,
- configure a scalable, load-balanced VPN server farm using one or more machines which can handle thousands of dynamic connections from incoming VPN clients,
- use all of the encryption, authentication, and certification features of the OpenSSL library to protect your private network traffic as it transits the internet,
- use any cipher, key size, or HMAC digest (for datagram integrity checking) supported by the OpenSSL library,
- choose between static-key based conventional encryption or certificate-based public key encryption,
- use static, pre-shared keys or TLS-based dynamic key exchange,
- use real-time adaptive link compression and traffic-shaping to manage link bandwidth utilization,
- tunnel networks whose public endpoints are dynamic such as DHCP or dial-in clients,
- tunnel networks through connection-oriented stateful firewalls without having to use explicit firewall rules,
- tunnel networks over NAT,
- create secure ethernet bridges using virtual tap devices, and
- control OpenVPN using a GUI on Windows or Mac OS X.

Webmin OpenVpm Admin Module allows you to create static or CA-based VPNs through a Web interface.
Webmin is a valid web-based instrument for Linux/Unix system administrator. OpenVPN allows to create and manage VPN supplying wide possibilities of configuration.
Their union, with also the pressing necessity of having an efficient instruments of administration, has carried OPEN IT to develop a module of Webmin for OpenVPN.
The Open VPNadmin module is web-based and it can be used within Webmin. Witj this module you can:
- manage the Certificate Authority (CA)
- manage the VPNs and check the active connections
Enhancements:
- The device number (tun0, tun1, etc.) is automatically added and can be modified interactively.
- In the module configuration area the default server has been added as a new item.
- Tests for the validity of keys, servers, and clients were modified.
- New config files were provided for NetBSD and OpenBSD.
- The server static form was adapted to the Webmin skins.

Kovpn is a simple OpenVPN GUI which is intended to fit end-users needs. Kovpn project runs without root privileges and can control the most important functions of openvpn:
- connect and disconnect
- username and password input
- private key passphrase input
- show status
- supports multiple openvpn connections
- Store username and/or passwords in kwallet
It requires some changes to your openvpn configuration file: You have to activate the management interface by adding these lines
management 127.0.0.1 11194
management-query-passwords
management-hold
You should choose localhost or 127.0.0.1 as host and a any unused port (e.g. 11194). You have to tell kovpn these host and port settings.
Please report any bug you find. It isnt well tested.
Enhancements:
- This release adds a simple DCOP interface (status report, connect, and disconnect).
- A resize bug in the configuration dialog has been fixed.
- Some options have been renamed to better reflect what they do.
- The German translation has been updated.

Passwd project is the Horde password changing application. While it has been released and is in production use at many sites, it is also under heavy development in an effort to expand and improve the module.

Right now, Passwd provides fairly complete support for changing passwords via Poppassd, LDAP, Unix expect scripts, the Unix smbpasswd command for SMB/CIFS passwords, Kolab, ADSI, Pine, Serv-U FTP, VMailMgr, vpopmail, and SQL passwords.

passwd_info is a simple program that can query the /etc/passwd file for current user or specified user.

USAGE: passwd_info [username]

Sample:

#include < unistd.h >
#include < stdlib.h >
#include < stdio.h >
#include < sys/types.h >
#include < pwd.h >
#include < string.h >

struct passwd *pw;

void print_usage(void);

int main( int argc, char *argv[] )
{
if ( argc > 2 ) {
print_usage();
exit(1);
}

char *name;
uid_t uid;
gid_t gid;
char *gecos;
char *dir;
char *shell;

char *user_arg;

if ( argv[1] != NULL ) {
user_arg=(char *)malloc(strlen(argv[1]));
strcpy( user_arg, argv[1] );
if ( (pw = getpwnam(user_arg) ) == NULL ) {
fprintf( stderr, "Error: user %s does not existn", user_arg );
exit(1);
}
uid = pw->pw_uid;
free(user_arg);
}
else /* get for current user */
{
uid = getuid();
pw = getpwuid(uid);
}

name = pw->pw_name;
gid = pw->pw_gid;
gecos = pw->pw_gecos;
dir = pw->pw_dir;
shell = pw->pw_shell;

printf( "/etc/passwd file information for %sn", name );
printf( "Username = %stUID = %dtGID = %dn", name, (int)uid, (int)gid );
printf( "GECOS = %snHome = %stShell = %sn", gecos, dir, shell );

exit(0);
}

void print_usage( void )
{
fprintf( stderr, "USAGE: passwd_info [username]n" );
}

Data::Password::Manager is a Perl module to generate, check, manage crypt - des passwords.

SYNOPSIS

use Data::Password::Manager qw(
pw_gen
pw_valid
pw_obscure
pw_clean
pw_get
);

$password = pw_gen($cleartext);
$ok = pw_valid($cleartxt,$password);
$clean_text = pw_clean($dirty_text);
($code,$text) = $pw_obscure($newpass,$oldpass,$min_len);
$passwd = pw_get($user,$passwd_file,$error);

$password = pw_gen($cleartext);
Generate a 13 character DES password string from clear text
input: string<<less