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-.\" ========================================================================
-.\"
-.IX Title "AUTH_KRB5 8"
-.TH AUTH_KRB5 8 "2008-04-06" "INN 2.4.5" "InterNetNews Documentation"
-.SH "NAME"
-auth_krb5 \- nnrpd Kerberos v5 authenticator
-.SH "SYNOPSIS"
-.IX Header "SYNOPSIS"
-\&\fBauth_krb5\fR [\fB\-i\fR \fIinstance\fR]
-.SH "DESCRIPTION"
-.IX Header "DESCRIPTION"
-This program does authentication for \fBnnrpd\fR against a Kerberos v5 \s-1KDC\s0.
-This is \s-1NOT\s0 real Kerberos authentication using service tickets; instead, a
-username and password is used to attempt to obtain a Kerberos v5 \s-1TGT\s0 to
-confirm that they are valid. As such, this authenticator assumes that
-\&\fBnnrpd\fR has been given the user's username and password, and therefore is
-not as secure as real Kerberos authentication. It generally should only
-be used with \s-1NNTP\s0 over \s-1SSL\s0 to protect the password from sniffing.
-.SH "OPTIONS"
-.IX Header "OPTIONS"
-.IP "\fB\-i\fR \fIinstance\fR" 4
-.IX Item "-i instance"
-If this option is given, \fIinstance\fR will be used as the instance of the
-principal received from \fBnnrpd\fR and authentication will be done against
-that principal instead of the base principal. In other words, a principal
-like \f(CW\*(C`user\*(C'\fR, when passed to \fBauth_krb5\fR invoked with \f(CW\*(C`\-i nntp\*(C'\fR, will be
-transformed into \f(CW\*(C`user/nntp\*(C'\fR before attempting Kerberos authentication.
-.Sp
-Since giving one's password to \fBnnrpd\fR is not as secure as normal
-Kerberos authentication, this option supports a configuration where all
-users are given a separate instance just for news authentication with its
-own password, so their regular account password isn't exposed via \s-1NNTP\s0.
-.SH "EXAMPLE"
-.IX Header "EXAMPLE"
-The following \fIreaders.conf\fR\|(5) fragment tells nnrpd to authenticate users
-by attempting to obtain Kerberos v5 TGTs for them, appending an instance
-of \f(CW\*(C`nntp\*(C'\fR to usernames before doing so:
-.PP
-.Vb 3
-\& auth kerberos {
-\& auth: "auth_krb5 \-i nntp"
-\& }
-.Ve
-.PP
-.Vb 4
-\& access kerberos {
-\& users: "*/nntp"
-\& newsgroups: example.*
-\& }
-.Ve
-.PP
-Access is granted to the example.* groups for all users who successfully
-authenticate.
-.SH "BUGS"
-.IX Header "BUGS"
-Currently, any username containing realm information (containing \f(CW\*(C`@\*(C'\fR) is
-rejected. This is to prevent someone from passing in a username
-corresponding to a principal in another realm that they have access to and
-gaining access to the news server via it. However, this is also something
-that people may wish to do under some circumstances, so there should be a
-better way of handling it (such as, perhaps, a list of acceptable realms
-or a \-r flag specifying the realm in which to attempt authentication).
-.PP
-It's not clear the right thing to do when the username passed in contains
-a \f(CW\*(C`/\*(C'\fR and \fB\-i\fR was also given. Right now, \fBauth_krb5\fR will create a
-malformed Kerberos principal with multiple instances and attempt to
-authenticate against it, which will fail but perhaps not with the best
-error message.
-.SH "HISTORY"
-.IX Header "HISTORY"
-Originally written by Christopher P. Lindsey. This documentation was
-written by Russ Allbery <rra@stanford.edu> based on Christopher's original
-\&\s-1README\s0 file.
-.PP
-$Id: auth_krb5.8 7880 2008-06-16 20:37:13Z iulius $
-.SH "SEE ALSO"
-.IX Header "SEE ALSO"
-\&\fInnrpd\fR\|(8), \fIreaders.conf\fR\|(5)
-.PP
-The latest version of Christopher's original \fBnnrpkrb5auth\fR may be found
-on his web site at <http://www.mallorn.com/tools/>.
~ian / innduct.git / blobdiff