DBMMANAGE(1) dbmmanage DBMMANAGE(1)
NAME
dbmmanage - Manage user authentication files in DBM format
SYNOPSIS
dbmmanage [ encoding ] filename add|adduser|check|delete|update username [ encpasswd [
group[,group...] [ comment ] ] ]
dbmmanage filename view [ username ]
dbmmanage filename import
SUMMARY
dbmmanage is used to create and update the DBM format files used to store usernames and
password for basic authentication of HTTP users via mod_authn_dbm. Resources available
from the Apache HTTP server can be restricted to just the users listed in the files cre-
ated by dbmmanage. This program can only be used when the usernames are stored in a DBM
file. To use a flat-file database see htpasswd.
This manual page only lists the command line arguments. For details of the directives nec-
essary to configure user authentication in httpd see the httpd manual, which is part of
the Apache distribution or can be found at http://httpd.apache.org/.
OPTIONS
filename
The filename of the DBM format file. Usually without the extension .db, .pag, or
.dir.
username
The user for which the operations are performed. The username may not contain a
colon (:).
encpasswd
This is the already encrypted password to use for the update and add commands. You
may use a hyphen (-) if you want to get prompted for the password, but fill in the
fields afterwards. Additionally when using the update command, a period (.) keeps
the original password untouched.
group A group, which the user is member of. A groupname may not contain a colon (:). You
may use a hyphen (-) if you don't want to assign the user to a group, but fill in
the comment field. Additionally when using the update command, a period (.) keeps
the original groups untouched.
comment
This is the place for your opaque comments about the user, like realname, mailad-
dress or such things. The server will ignore this field.
Encodings
-d crypt encryption (default, except on Win32, Netware)
-m MD5 encryption (default on Win32, Netware)
-s SHA1 encryption
-p plaintext (not recommended)
Commands
add Adds an entry for username to filename using the encrypted password encpasswd. dbm-
manage passwords.dat add rbowen foKntnEF3KSXA
adduser
Asks for a password and then adds an entry for username to filename. dbmmanage
passwords.dat adduser krietz
check Asks for a password and then checks if username is in filename and if it's password
matches the specified one. dbmmanage passwords.dat check rbowen
delete Deletes the username entry from filename. dbmmanage passwords.dat delete rbowen
import Reads username:password entries (one per line) from STDIN and adds them to file-
name. The passwords already have to be crypted.
update Same as the adduser command, except that it makes sure username already exists in
filename. dbmmanage passwords.dat update rbowen
view Just displays the contents of the DBM file. If you specify a username, it displays
the particular record only. dbmmanage passwords.dat view
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, the GNU project's GDBM, and Berkeley DB 2. 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 dbmmanage expects to see. dbmmanage
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 different name, or at worst, it may corrupt the DBM file if you were attempting to
write to it.
dbmmanage has a list of DBM format preferences, defined by the @AnyDBM::ISA array near the
beginning of the program. Since we prefer the Berkeley DB 2 file format, the order in
which dbmmanage will look for system libraries is Berkeley DB 2, then NDBM, then GDBM and
then SDBM. The first library found will be the library dbmmanage will attempt to use for
all DBM file transactions. This ordering is slightly different than the standard @Any-
DBM::ISA ordering in Perl, as well as the ordering used by the simple dbmopen() call in
Perl, so if you use any other utilities to manage your DBM files, they must also follow
this preference ordering. Similar care must be taken if using programs in other languages,
like C, to access these files.
One can usually use the file program supplied with most Unix systems to see what format a
DBM file is in.
Apache HTTP Server 2004-12-10 DBMMANAGE(1)
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