- dacs_passwd [m[blue]dacsoptionsm]
The dacs_passwd web service is used to manage usernames and passwords recognized by m[blue]local_passwd_authenticatem, a DACS authentication module. This utility serves a similar purpose for local_passwd_authenticate that Apache's m[blue]htpasswd(1)m command does for its m[blue]mod_authm and m[blue]mod_auth_dbmm modules. These accounts and passwords are used only by local_passwd_authenticate and are completely separate from any other accounts and passwords.
Much of the functionality of this program is also available as a DACS utility, m[blue]dacspasswd(1)m, which operates on the same password files. Because m[blue]dacs_admin(8)m provides the same functionality and more, dacs_passwd may be removed in a future release.
The default DACS ACL restricts use of this web service to a DACS administrator and to users who are setting the password for their own DACS account at the receiving jurisdiction. Administrators should ensure that the ACL for dacs_passwd is correct for their environment.
Web Service Arguments
In addition to the m[blue]standard CGI argumentsm, dacs_passwd understands the following CGI arguments:
The following operations are supported:
Like SET but add or replace an entry for USERNAME.
Delete the account for USERNAME.
Disable the account for USERNAME.
Enable the account for USERNAME.
List USERNAME, if it exists, otherwise all usernames. A disabled account is indicated by a '*' (which is not a valid character in a username).
Sets or resets a DACS password for USERNAME to NEW_PASSWORD. The CONFIRM_NEW_PASSWORD argument must also be given and be identical to NEW_PASSWORD. Unless the operation is performed by a DACS administrator (i.e., an m[blue]ADMIN_IDENTITYm) or disabled by the m[blue]PASSWORD_OPS_NEED_PASSWORDm directive, the current password for USERNAME must be given as PASSWORD.
For users other than a DACS administrator, a password must meet certain requirements on its length and the character set from which it is comprised. Note that these requirements are only significant at the time a password is set or changed; existing passwords are unaffected by changes to the configuration directives. Please refer to the m[blue]PASSWORD_CONSTRAINTSm directive.
Users should be made aware of security issues related to passwords, including better techniques for selecting passwords and keeping them private.
How to choose better passwords
Users might consider adopting a method such as the one described in m[blue]this proposalm. It suggests that users construct site-specific passwords from three components:
- 1. PIN-1, a short, random string that is common to all of the user's passwords, kept secret, and not likely to be in any dictionary;
- 2. SITE, a string that is derived from the site's domain name using some simple and easy-to-remember procedure (e.g., using the first four letters or consonents); and
- 3. PIN-2, a short, site-specific random string (this component is different for each of a user's passwords, and is something not likely to be in any dictionary).
PIN-1 is memorized by the user. The other two components may be written down but must be kept in a relatively secure location (such as in the user's wallet or in a desk drawer). The user forms his or her passwords by combining these three components in any order that is easy to remember.
For the site www.example.net, a user might select the password "examRB8s#i8", where "exam" (component 2, SITE) is derived from the site's domain name, "RB8s" is a random string used with this password only (component 3, PIN-2), and "#i8" is the user's secret PIN (component 1, PIN-1). Because it is probably difficult to remember, the user might create a note with "examRB8s" written on it (SITE and PIN-2), but not PIN-1.
For the site dacs.dss.ca, the same user might select the password "dssceIM#i8".
Since most people are not very good at it, the random strings should be chosen using a good-quality random generator, such as the m[blue]random()m function:
% dacsexpr -e "random(string, 4, 'a-zA-Z0-9,./;@#')" "y2FJ"
In addition to being difficult to guess because of their random components and reasonably large character set, these passwords are different for each site; should one password be compromised, the others are not immediately available to an attacker. Similarly, the written strings cannot be immediately exploited if they are stolen or copied. The strength of the method can be increased by making either or both PIN components longer, or chosen from a larger space of characters.
- • ADD
- Either PASSWD (the default) or SIMPLE, case insensitively, to select between the item types passwds and simple, respectively. The requested item type must be configured (see m[blue]dacs.conf(5)m).
- The DACS username of interest.
- By default, output is emitted in HTML. Several varieties of XML output can be selected, however, using the FORMAT argument (please refer to m[blue]dacs(1)m and m[blue]dacs_passwd.dtdm).
The program exits 0 if everything was fine, 1 if an error occurred.
Distributed Systems Software (m[blue]www.dss.cam)
Copyright2003-2013 Distributed Systems Software. See the m[blue]LICENSEm file that accompanies the distribution for licensing information.
- standard CGI arguments
- this proposal