GSSCRED(8) Maintenance Commands and Procedures GSSCRED(8)

NAME

gsscred - add, remove, and list gsscred table entries

SYNOPSIS

gsscred [-n user [-o oid] [-u uid]] [-c comment] -m mech -a


gsscred [-n user [-o oid]] [-u uid] [-m mech] -r


gsscred [-n user [-o oid]] [-u uid] [-m mech] -l

DESCRIPTION

The gsscred utility is used to create and maintain a mapping between a
security principal name and a local UNIX uid. The format of the user name
is assumed to be GSS_C_NT_USER_NAME. You can use the -o option to specify
the object identifier of the name type. The OID must be specified in dot-
separated notation, for example: 1.2.3.45464.3.1


The gsscred table is used on server machines to lookup the uid of
incoming clients connected using RPCSEC_GSS.


When adding users, if no user name is specified, an entry is created in
the table for each user from the passwd table. If no comment is
specified, the gsscred utility inserts a comment that specifies the user
name as an ASCII string and the GSS-APIsecurity mechanism that applies to
it. The security mechanism will be in string representation as defined in
the /etc/gss/mech file.


The parameters are interpreted the same way by the gsscred utility to
delete users as they are to create users. At least one of the following
options must be specified: -n, -u, or -m. If no security mechanism is
specified, then all entries will be deleted for the user identified by
either the uid or user name. If only the security mechanism is specified,
then all user entries for that security mechanism will be deleted.


Again, the parameters are interpreted the same way by the gsscred utility
to search for users as they are to create users. If no options are
specified, then the entire table is returned. If the user name or uid is
specified, then all entries for that user are returned. If a security
mechanism is specified, then all user entries for that security mechanism
are returned.

OPTIONS

-a
Add a table entry.


-c comment
Insert comment about this table entry.


-l
Search table for entry.


-m mech
Specify the mechanism for which this name is to be
translated.


-n user
Specify the optional principal name.


-o oid
Specify the OID indicating the name type of the user.


-r
Remove the entry from the table.


-u uid
Specify the uid for the user if the user is not local.

EXAMPLES

Example 1: Creating a gsscred Table for the Kerberos v5 Security Mechanism

The following shows how to create a gsscred table for the kerberos v5
security mechanism. gsscred obtains user names and uid's from the passwd
table to populate the table.


example% gsscred -m kerberos_v5 -a

Example 2: Adding an Entry for root/host1 for the Kerberos v5 Security

Mechanism


The following shows how to add an entry for root/host1 with a specified
uid of 0 for the kerberos v5 security mechanism.


example% gsscred -m kerberos_v5 -n root/host1 -u 0 -a

Example 3: Listing All User Mappings for the Kerberos v5 Security

Mechanism


The following lists all user mappings for the kerberos v5 security
mechanism.


example% gsscred -m kerberos_v5 -l

Example 4: Listing All Mappings for All Security Mechanism for a Specified

User


The following lists all mappings for all security mechanisms for the user
bsimpson.


example% gsscred -n bsimpson -l

EXIT STATUS

The following exit values are returned:

0
Successful completion.


>0
An error occurred.

ATTRIBUTES

See attributes(7) for descriptions of the following attributes:


+--------------------+-----------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+--------------------+-----------------+
|Interface Stability | Evolving |
+--------------------+-----------------+

SEE ALSO

gsscred.conf(5), attributes(7), gssd(8)

NOTES

Some GSS mechanisms, such as kerberos_v5, provide their own
authenticated-name-to-local-name (uid) mapping and thus do not usually
have to be mapped using gsscred. See gsscred.conf(5) for more
information.

February 11, 2004 GSSCRED(8)