Home Man
Search
Today's Posts
Register

Linux & Unix Commands - Search Man Pages

Linux 2.6 - man page for htdbm (linux section 1)

HTDBM(1)				      htdbm					 HTDBM(1)

NAME
       htdbm - Manipulate DBM password databases

SYNOPSIS
       htdbm [ -TDBTYPE ] [ -c ] [ -m | -d | -p | -s ] [ -t ] [ -v ] [ -x ] filename username

       htdbm  -b  [ -TDBTYPE ] [ -c ] [ -m | -d | -p | -s ] [ -t ] [ -v ] filename username pass-
       word

       htdbm -n [ -c ] [ -m | -d | -p | -s ] [ -t ] [ -v ] username

       htdbm -nb [ -c ] [ -m | -d | -p | -s ] [ -t ] [ -v ] username password

       htdbm -v [ -TDBTYPE ] [ -c ] [ -m | -d | -p | -s ] [ -t ] [ -v ] filename username

       htdbm -vb [ -TDBTYPE ] [ -c ] [ -m | -d | -p | -s ] [ -t ] [ -v ] filename username  pass-
       word

       htdbm -x [ -TDBTYPE ] [ -m | -d | -p | -s ] filename username

       htdbm -l [ -TDBTYPE ]

SUMMARY
       htdbm  is used to manipulate the DBM format files used to store usernames and password for
       basic authentication of HTTP users via mod_authn_dbm. See the dbmmanage documentation  for
       more information about these DBM files.

OPTIONS
       -b     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.

       -c     Create the passwdfile. If passwdfile already exists, it is rewritten and truncated.
	      This option cannot be combined with the -n option.

       -n     Display the results on standard output rather than updating a database. 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.

       -m     Use MD5 encryption for passwords. On Windows, Netware and TPF, this is the default.

       -d     Use crypt() encryption for passwords. The default on  all  platforms  but  Windows,
	      Netware  and  TPF.  Though  possibly supported by htdbm on all platforms, it is not
	      supported by the httpd server on Windows, Netware and TPF.

       -s     Use SHA encryption for passwords. Facilitates migration  from/to	Netscape  servers
	      using the LDAP Directory Interchange Format (ldif).

       -p     Use  plaintext  passwords. Though htdbm will support creation on all platforms, the
	      httpd daemon will only accept plain text passwords on Windows, Netware and TPF.

       -l     Print each of the usernames and comments from the database on stdout.

       -t     Interpret the final parameter as a comment. When this option is specified, an addi-
	      tional  string  can  be appended to the command line; this string will be stored in
	      the "Comment" field of the database, associated with the specified username.

       -v     Verify the username and password. The  program  will  print  a  message  indicating
	      whether  the  supplied  password	is valid. If the password is invalid, the program
	      exits with error code 3.

       -x     Delete user. If the username exists in the specified DBM file, it will be deleted.

       filename
	      The filename of the DBM format file. Usually without the extension  .db,	.pag,  or
	      .dir.  If  -c  is  given,  the DBM file is created if it does not already exist, or
	      updated if it does exist.

       username
	      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.

       password
	      The  plaintext  password to be encrypted and stored in the DBM file. Used only with
	      the -b flag.

       -TDBTYPE
	      Type of DBM file (SDBM, GDBM, DB, or "default").

BUGS
       One should be aware that there are a number of different DBM file  formats  in  existence,
       and  with all likelihood, libraries for more than one format may exist on your system. The
       three primary examples are SDBM, NDBM, GNU GDBM, and Berkeley/Sleepycat DB 2/3/4. Unfortu-
       nately,	all  these  libraries use different file formats, and you must make sure that the
       file format used by filename is the same format that htdbm expects to see. htdbm currently
       has  no	way  of  determining  what type of DBM file it is looking at. If used against the
       wrong format, will simply return nothing, or may create a different DBM file with  a  dif-
       ferent  name,  or at worst, it may corrupt the DBM file if you were attempting to write to
       it.

       One can usually use the file program supplied with most Unix systems to see what format	a
       DBM file is in.

EXIT STATUS
       htdbm  returns  a zero status ("true") if the username and password have been successfully
       added or updated in the DBM File. htdbm returns 1 if it encounters some problem	accessing
       files,  2  if  there  was  a  syntax  problem with the command line, 3 if the password was
       entered interactively and the verification entry didn't match,  4  if  its  operation  was
       interrupted,  5	if  a  value is too long (username, filename, password, or final computed
       record), 6 if the username contains illegal characters (see the Restrictions section), and
       7 if the file is not a valid DBM password file.

EXAMPLES
	     htdbm /usr/local/etc/apache/.htdbm-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, htdbm will do nothing except return an error.

	     htdbm -c /home/doe/public_html/.htdbm 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 htdbm will display a message and return an error status.

	     htdbm -mb /usr/web/.htdbm-all jones Pwd4Steve

       Encrypts the password from the command line  (Pwd4Steve)  using	the  MD5  algorithm,  and
       stores it in the specified file.

SECURITY CONSIDERATIONS
       Web  password  files  such as those managed by htdbm should not be within the Web server's
       URI space -- that is, they should not be fetchable with a browser.

       The use of the -b option is discouraged, since when it is used  the  unencrypted  password
       appears on the command line.

RESTRICTIONS
       On  the	Windows  and MPE platforms, passwords encrypted with htdbm are limited to no more
       than 255 characters in length. Longer passwords will be truncated to 255 characters.

       The MD5 algorithm used by htdbm is specific to the Apache  software;  passwords	encrypted
       using it will not be usable with other Web servers.

       Usernames are limited to 255 bytes and may not include the character :.

Apache HTTP Server			    2009-02-12					 HTDBM(1)


All times are GMT -4. The time now is 05:46 AM.

Unix & Linux Forums Content Copyrightę1993-2018. All Rights Reserved.
UNIX.COM Login
Username:
Password:  
Show Password