htpasswd is used to create and update the flat-files used to store usernames and password for basic authentication of HTTP users. If htpasswd cannot access a file, such as not being able to write to the output file or not being able to read the file in order to update it, it returns an error status and makes no changes.
Resources available from the apache Apache web server can be restricted to just the users listed in the files created by htpasswd. This program can only manage usernames and passwords stored in a flat-file. It can encrypt and display password information for use in other types of data stores, though. To use a DBM database see dbmmanage.
htpasswd encrypts passwords using either a version of MD5 modified for Apache, or the system's crypt() routine. Files managed by htpasswd may contain both types of passwords; some user records may have MD5-encrypted passwords while others in the same file may have passwords encrypted with crypt().
Use batch mode; i.e., get the password from the command line rather than prompting for it. This option should be used with extreme care, since the password is clearly visible on the command line.
Create the passwdfile. If passwdfile already exists, it is rewritten and truncated. This option cannot be combined with the -n option.
Display the results on standard output rather than updating a file. This is useful for generating password records acceptable to Apache for inclusion in non-text data stores. This option changes the syntax of the command line, since the passwdfile argument (usually the first one) is omitted. It cannot be combined with the -c option.
Use Apache's modified MD5 algorithm for passwords. Passwords encrypted with this algorithm are transportable to any platform (Windows, Unix, BeOS, et cetera) running Apache 1.3.9 or later. On Windows and TPF, this flag is the default.
Use crypt() encryption for passwords. The default on all platforms but Windows and TPF. Though possibly supported by htpasswd on all platforms, it is not supported by the apache server on Windows and TPF.
Use SHA encryption for passwords. Faciliates migration from/to Netscape servers using the LDAP Directory Interchange Format (ldif).
Use plaintext passwords. Though htpasswd will support creation on all platforms, the apache deamon will only accept plain text passwords on Windows and TPF.
exist, or rewritten and truncated if it does exist.
The username to create or update in passwdfile. If username does not exist in this file, an entry is added. If it does exist, the password is changed.
htpasswd /usr/local/etc/apache/.htpasswd-users jsmith
Adds or modifies the password for user jsmith. The user is prompted for the password. If executed on a Windows system, the password will be encrypted using the modified Apache MD5 algorithm; otherwise, the system's crypt() routine will be used. If the file does not exist, htpasswd will do nothing except return an error.
htpasswd -c /home/doe/public_html/.htpasswd jane
Creates a new file and stores a record in it for user jane. The user is prompted for the password. If the file exists and cannot be read, or cannot be written, it is not altered and htpasswd will display a message and return an error status.
htpasswd -mb /usr/web/.htpasswd-all jones Pwd4Steve
Web password files such as those managed by htpasswd should not be within the Web server's URI space -- that is, they should not be fetchable with a browser.
On the Windows and MPE platforms, passwords encrypted with htpasswd are limited to no more than 255 characters in length. Longer passwords will be truncated to 255 characters.
The MD5 algorithm used by htpasswd is specific to the Apache software; passwords encrypted using it will not be usable with other Web servers.