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Diffstat (limited to 'modules/pam_access/access.conf.5')
| -rw-r--r-- | modules/pam_access/access.conf.5 | 222 |
1 files changed, 222 insertions, 0 deletions
diff --git a/modules/pam_access/access.conf.5 b/modules/pam_access/access.conf.5 new file mode 100644 index 00000000..1c217b9f --- /dev/null +++ b/modules/pam_access/access.conf.5 @@ -0,0 +1,222 @@ +'\" t +.\" Title: access.conf +.\" Author: [see the "AUTHORS" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "ACCESS\&.CONF" "5" "06/08/2020" "Linux-PAM Manual" "Linux\-PAM Manual" +.\" ----------------------------------------------------------------- +.\" * Define some portability stuff +.\" ----------------------------------------------------------------- +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.\" http://bugs.debian.org/507673 +.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html +.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +.ie \n(.g .ds Aq \(aq +.el .ds Aq ' +.\" ----------------------------------------------------------------- +.\" * set default formatting +.\" ----------------------------------------------------------------- +.\" disable hyphenation +.nh +.\" disable justification (adjust text to left margin only) +.ad l +.\" ----------------------------------------------------------------- +.\" * MAIN CONTENT STARTS HERE * +.\" ----------------------------------------------------------------- +.SH "NAME" +access.conf \- the login access control table file +.SH "DESCRIPTION" +.PP +The +/etc/security/access\&.conf +file specifies (\fIuser/group\fR, +\fIhost\fR), (\fIuser/group\fR, +\fInetwork/netmask\fR), (\fIuser/group\fR, +\fItty\fR), (\fIuser/group\fR, +\fIX\-$DISPLAY\-value\fR), or (\fIuser/group\fR, +\fIpam\-service\-name\fR) combinations for which a login will be either accepted or refused\&. +.PP +When someone logs in, the file +access\&.conf +is scanned for the first entry that matches the (\fIuser/group\fR, +\fIhost\fR) or (\fIuser/group\fR, +\fInetwork/netmask\fR) combination, or, in case of non\-networked logins, the first entry that matches the (\fIuser/group\fR, +\fItty\fR) combination, or in the case of non\-networked logins without a tty, the first entry that matches the (\fIuser/group\fR, +\fIX\-$DISPLAY\-value\fR) or (\fIuser/group\fR, +\fIpam\-service\-name/\fR) combination\&. The permissions field of that table entry determines whether the login will be accepted or refused\&. +.PP +Each line of the login access control table has three fields separated by a ":" character (colon): +.PP +\fIpermission\fR:\fIusers/groups\fR:\fIorigins\fR +.PP +The first field, the +\fIpermission\fR +field, can be either a "\fI+\fR" character (plus) for access granted or a "\fI\-\fR" character (minus) for access denied\&. +.PP +The second field, the +\fIusers\fR/\fIgroup\fR +field, should be a list of one or more login names, group names, or +\fIALL\fR +(which always matches)\&. To differentiate user entries from group entries, group entries should be written with brackets, e\&.g\&. +\fI(group)\fR\&. +.PP +The third field, the +\fIorigins\fR +field, should be a list of one or more tty names (for non\-networked logins), X +\fI$DISPLAY\fR +values or PAM service names (for non\-networked logins without a tty), host names, domain names (begin with "\&."), host addresses, internet network numbers (end with "\&."), internet network addresses with network mask (where network mask can be a decimal number or an internet address also), +\fIALL\fR +(which always matches) or +\fILOCAL\fR\&. The +\fILOCAL\fR +keyword matches if and only if +\fBpam_get_item\fR(3), when called with an +\fIitem_type\fR +of +\fIPAM_RHOST\fR, returns +NULL +or an empty string (and therefore the +\fIorigins\fR +field is compared against the return value of +\fBpam_get_item\fR(3) +called with an +\fIitem_type\fR +of +\fIPAM_TTY\fR +or, absent that, +\fIPAM_SERVICE\fR)\&. +.PP +If supported by the system you can use +\fI@netgroupname\fR +in host or user patterns\&. The +\fI@@netgroupname\fR +syntax is supported in the user pattern only and it makes the local system hostname to be passed to the netgroup match call in addition to the user name\&. This might not work correctly on some libc implementations causing the match to always fail\&. +.PP +The +\fIEXCEPT\fR +operator makes it possible to write very compact rules\&. +.PP +If the +\fBnodefgroup\fR +is not set, the group file is searched when a name does not match that of the logged\-in user\&. Only groups are matched in which users are explicitly listed\&. However the PAM module does not look at the primary group id of a user\&. +.PP +The "\fI#\fR" character at start of line (no space at front) can be used to mark this line as a comment line\&. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +/etc/security/access\&.conf\&. +.PP +User +\fIroot\fR +should be allowed to get access via +\fIcron\fR, X11 terminal +\fI:0\fR, +\fItty1\fR, \&.\&.\&., +\fItty5\fR, +\fItty6\fR\&. +.PP ++:root:crond :0 tty1 tty2 tty3 tty4 tty5 tty6 +.PP +User +\fIroot\fR +should be allowed to get access from hosts which own the IPv4 addresses\&. This does not mean that the connection have to be a IPv4 one, a IPv6 connection from a host with one of this IPv4 addresses does work, too\&. +.PP ++:root:192\&.168\&.200\&.1 192\&.168\&.200\&.4 192\&.168\&.200\&.9 +.PP ++:root:127\&.0\&.0\&.1 +.PP +User +\fIroot\fR +should get access from network +192\&.168\&.201\&. +where the term will be evaluated by string matching\&. But it might be better to use network/netmask instead\&. The same meaning of +192\&.168\&.201\&. +is +\fI192\&.168\&.201\&.0/24\fR +or +\fI192\&.168\&.201\&.0/255\&.255\&.255\&.0\fR\&. +.PP ++:root:192\&.168\&.201\&. +.PP +User +\fIroot\fR +should be able to have access from hosts +\fIfoo1\&.bar\&.org\fR +and +\fIfoo2\&.bar\&.org\fR +(uses string matching also)\&. +.PP ++:root:foo1\&.bar\&.org foo2\&.bar\&.org +.PP +User +\fIroot\fR +should be able to have access from domain +\fIfoo\&.bar\&.org\fR +(uses string matching also)\&. +.PP ++:root:\&.foo\&.bar\&.org +.PP +User +\fIroot\fR +should be denied to get access from all other sources\&. +.PP +\-:root:ALL +.PP +User +\fIfoo\fR +and members of netgroup +\fIadmins\fR +should be allowed to get access from all sources\&. This will only work if netgroup service is available\&. +.PP ++:@admins foo:ALL +.PP +User +\fIjohn\fR +and +\fIfoo\fR +should get access from IPv6 host address\&. +.PP ++:john foo:2001:db8:0:101::1 +.PP +User +\fIjohn\fR +should get access from IPv6 net/mask\&. +.PP ++:john:2001:db8:0:101::/64 +.PP +Members of group +\fIwheel\fR +should be allowed to get access from all sources\&. +.PP ++:(wheel):ALL +.PP +Disallow console logins to all but the shutdown, sync and all other accounts, which are a member of the wheel group\&. +.PP +\-:ALL EXCEPT (wheel) shutdown sync:LOCAL +.PP +All other users should be denied to get access from all sources\&. +.PP +\-:ALL:ALL +.SH "NOTES" +.PP +The default separators of list items in a field are space, \*(Aq,\*(Aq, and tabulator characters\&. Thus conveniently if spaces are put at the beginning and the end of the fields they are ignored\&. However if the list separator is changed with the +\fIlistsep\fR +option, the spaces will become part of the actual item and the line will be most probably ignored\&. For this reason, it is not recommended to put spaces around the \*(Aq:\*(Aq characters\&. +.SH "SEE ALSO" +.PP +\fBpam_access\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHORS" +.PP +Original +\fBlogin.access\fR(5) +manual was provided by Guido van Rooij which was renamed to +\fBaccess.conf\fR(5) +to reflect relation to default config file\&. +.PP +Network address / netmask description and example text was introduced by Mike Becher <mike\&.becher@lrz\-muenchen\&.de>\&. |