Issue

Over the last year I worked with RedHat to find a solution on how to limit user logins to a server in RHEL 6 via LDAP. RedHat recommended to add the following to the /etc/security/access.conf file; this solution works well. I have used the augtool to look at the /etc/security/access.conf file and augtool is complaining about the syntax that was added to restrict logins. Does the augtool lens for access.conf need to be updated???? I have included the access.conf, the augtool output and the augeas access.conf lens. Thank-you

+:root:LOCAL
+:@rhel-app-wirefeed:ALL
-:ALL:ALL

# cat -n /etc/security/access.conf
     1  # Login access control table.
     2  #
     3  # Comment line must start with "#", no space at front.
     4  # Order of lines is important.
     5  #
     6  # When someone logs in, the table is scanned for the first entry that
     7  # matches the (user, host) combination, or, in case of non-networked
     8  # logins, the first entry that matches the (user, tty) combination.  The
     9  # permissions field of that table entry determines whether the login will
    10  # be accepted or refused.
    11  #
    12  # Format of the login access control table is three fields separated by a
    13  # ":" character:
    14  #
    15  # [Note, if you supply a 'fieldsep=|' argument to the pam_access.so
    16  # module, you can change the field separation character to be
    17  # '|'. This is useful for configurations where you are trying to use
    18  # pam_access with X applications that provide PAM_TTY values that are
    19  # the display variable like "host:0".]
    20  #
    21  #       permission : users : origins
    22  #
    23  # The first field should be a "+" (access granted) or "-" (access denied)
    24  # character.
    25  #
    26  # The second field should be a list of one or more login names, group
    27  # names, or ALL (always matches). A pattern of the form user@host is
    28  # matched when the login name matches the "user" part, and when the
    29  # "host" part matches the local machine name.
    30  #
    31  # The third field should be a list of one or more tty names (for
    32  # non-networked logins), host names, domain names (begin with "."), host
    33  # addresses, internet network numbers (end with "."), ALL (always
    34  # matches), NONE (matches no tty on non-networked logins) or
    35  # LOCAL (matches any string that does not contain a "." character).
    36  #
    37  # You can use @netgroupname in host or user patterns; this even works
    38  # for @usergroup@@hostgroup patterns.
    39  #
    40  # The EXCEPT operator makes it possible to write very compact rules.
    41  #
    42  # The group file is searched only when a name does not match that of the
    43  # logged-in user. Both the user's primary group is matched, as well as
    44  # groups in which users are explicitly listed.
    45  # To avoid problems with accounts, which have the same name as a group,
    46  # you can use brackets around group names '(group)' to differentiate.
    47  # In this case, you should also set the "nodefgroup" option.
    48  #
    49  # TTY NAMES: Must be in the form returned by ttyname(3) less the initial
    50  # "/dev" (e.g. tty1 or vc/1)
    51  #
    52  ##############################################################################
    53  #
    54  # Disallow non-root logins on tty1
    55  #
    56  #-:ALL EXCEPT root:tty1
    57  #
    58  # Disallow console logins to all but a few accounts.
    59  #
    60  #-:ALL EXCEPT wheel shutdown sync:LOCAL
    61  #
    62  # Same, but make sure that really the group wheel and not the user
    63  # wheel is used (use nodefgroup argument, too):
    64  #
    65  #-:ALL EXCEPT (wheel) shutdown sync:LOCAL
    66  #
    67  # Disallow non-local logins to privileged accounts (group wheel).
    68  #
    69  #-:wheel:ALL EXCEPT LOCAL .win.tue.nl
    70  #
    71  # Some accounts are not allowed to login from anywhere:
    72  #
    73  #-:wsbscaro wsbsecr wsbspac wsbsym wscosor wstaiwde:ALL
    74  #
    75  # All other accounts are allowed to login from anywhere.
    76  #
    77  ##############################################################################
    78  # All lines from here up to the end are building a more complex example.
    79  ##############################################################################
    80  #
    81  # User "root" should be allowed to get access via cron .. tty5 tty6.
    82  #+ : root : cron crond :0 tty1 tty2 tty3 tty4 tty5 tty6
    83  #
    84  # User "root" should be allowed to get access from hosts with ip addresses.
    85  #+ : root : 192.168.200.1 192.168.200.4 192.168.200.9
    86  #+ : root : 127.0.0.1
    87  #
    88  # User "root" should get access from network 192.168.201.
    89  # This term will be evaluated by string matching.
    90  # comment: It might be better to use network/netmask instead.
    91  #          The same is 192.168.201.0/24 or 192.168.201.0/255.255.255.0
    92  #+ : root : 192.168.201.
    93  #
    94  # User "root" should be able to have access from domain.
    95  # Uses string matching also.
    96  #+ : root : .foo.bar.org
    97  #
    98  # User "root" should be denied to get access from all other sources.
    99  #- : root : ALL
   100  #
   101  # User "foo" and members of netgroup "nis_group" should be
   102  # allowed to get access from all sources.
   103  # This will only work if netgroup service is available.
   104  #+ : @nis_group foo : ALL
   105  #
   106  # User "john" should get access from ipv4 net/mask
   107  #+ : john : 127.0.0.0/24
   108  #
   109  # User "john" should get access from ipv4 as ipv6 net/mask
   110  #+ : john : ::ffff:127.0.0.0/127
   111  #
   112  # User "john" should get access from ipv6 host address
   113  #+ : john : 2001:4ca0:0:101::1
   114  #
   115  # User "john" should get access from ipv6 host address (same as above)
   116  #+ : john : 2001:4ca0:0:101:0:0:0:1
   117  #
   118  # User "john" should get access from ipv6 net/mask
   119  #+ : john : 2001:4ca0:0:101::/64
   120  #
   121  # All other users should be denied to get access from all sources.
   122
   123  +:root:LOCAL
   124  +:@rhel-app-wirefeed:ALL
   125  -:ALL:ALL


augtool> print  /augeas//error
/augeas/files/etc/puppet/puppet.conf/error = "parse_failed"
/augeas/files/etc/puppet/puppet.conf/error/pos = "0"
/augeas/files/etc/puppet/puppet.conf/error/line = "1"
/augeas/files/etc/puppet/puppet.conf/error/char = "0"
/augeas/files/etc/puppet/puppet.conf/error/lens = "/usr/share/augeas/lenses/dist/inifile.aug:309.25-.43:"
/augeas/files/etc/puppet/puppet.conf/error/message = "Get did not match entire input"
/augeas/files/etc/passwd/error = "parse_failed"
/augeas/files/etc/passwd/error/pos = "1872"
/augeas/files/etc/passwd/error/line = "38"
/augeas/files/etc/passwd/error/char = "0"
/augeas/files/etc/passwd/error/lens = "/usr/share/augeas/lenses/dist/passwd.aug:64.17-.60:"
/augeas/files/etc/passwd/error/message = "Iterated lens matched less than it should"
/augeas/files/etc/security/access.conf/error = "parse_failed"
/augeas/files/etc/security/access.conf/error/pos = "4606"
/augeas/files/etc/security/access.conf/error/line = "123"
/augeas/files/etc/security/access.conf/error/char = "0"
/augeas/files/etc/security/access.conf/error/lens = "/usr/share/augeas/lenses/dist/access.aug:105.16-.39:"
/augeas/files/etc/security/access.conf/error/message = "Iterated lens matched less than it should"
/augeas/files/etc/nsswitch.conf/error = "parse_failed"
/augeas/files/etc/nsswitch.conf/error/pos = "1077"
/augeas/files/etc/nsswitch.conf/error/line = "35"
/augeas/files/etc/nsswitch.conf/error/char = "0"
/augeas/files/etc/nsswitch.conf/error/lens = "/usr/share/augeas/lenses/dist/nsswitch.aug:88.10-.41:"
/augeas/files/etc/nsswitch.conf/error/message = "Iterated lens matched less than it should"



[root@linux999 ~]# cat  /usr/share/augeas/lenses/dist/access.aug
(* 
Module: Access
  Parses /etc/security/access.conf

Author: Lorenzo Dalrio <lorenzo.dalrio@gmail.com>

About: Reference
  Some examples of valid entries can be found in access.conf or "man access.conf"

About: License
  This file is licensed under the LGPLv2+, like the rest of Augeas.

About: Lens Usage
  Sample usage of this lens in augtool

  * Add a rule to permit login of all users from local sources (tty's, X, cron)
  > set /files/etc/security/access.conf[0] +
  > set /files/etc/security/access.conf[0]/user ALL
  > set /files/etc/security/access.conf[0]/origin LOCAL

About: Configuration files
  This lens applies to /etc/security/access.conf. See <filter>.
*)
module Access =
  autoload xfm

(* Group: Comments and empty lines *)
(* Variable: comment *)
let comment   = Util.comment
(* Variable: empty line *)
let empty     = Util.empty
(* Group: Useful primitives *)
(* Variable: colon
 *  this is the standard field separator " : "
 *)
let colon     = Sep.space . Sep.colon . Sep.space


(************************************************************************
 * Group:                     ENTRY LINE
  *************************************************************************)
(* View: access
 * Allow (+) or deny (-) access
 *)
let access    = label "access" . store /[+-]/

(* View: user_re
 * Regex for user/netgroup fields
 *)
let user_re = Rx.word - /[Ee][Xx][Cc][Ee][Pp][Tt]/

(* View: user
 * user can be a username or a group
 *)
let user      = [ label "user" . store user_re ]

(* View: netgroup
 * Format is @NETGROUP[@@NISDOMAIN]
 *)
let netgroup =
    [ label "netgroup" . Util.del_str "@" . store user_re
      . [ label "nisdomain" . Util.del_str "@@" . store Rx.word ]? ]

(* View: user_list
 * A list of users or netgroups to apply the rule to
 *)
let user_list = Build.opt_list (user|netgroup) Sep.space

(* View: origin_list
 * origin_list can be a single ipaddr/originname/domain/fqdn or a list of those values
 *)
let origin_list = 
   let origin_re = Rx.no_spaces - /[Ee][Xx][Cc][Ee][Pp][Tt]/
   in Build.opt_list [ label "origin" . store origin_re ] Sep.space

(* View: except
 * The except operator makes it possible to write very compact rules. 
 *)
let except (lns:lens) = [ label "except" . Sep.space
                        . del /[Ee][Xx][Cc][Ee][Pp][Tt]/ "EXCEPT"
                        . Sep.space . lns ]

(* View: entry 
 * A valid entry line
 * Definition:
 *   > entry ::= access ':' user ':' origin_list
 *)
let entry     = [ access . colon
                . user_list
                . (except user_list)?
                . colon
                . origin_list
                . (except origin_list)?
                . Util.eol ]

(************************************************************************
 * Group:                        LENS & FILTER
  *************************************************************************)
(* View: lns
    The access.conf lens, any amount of
      * <empty> lines
      * <comments>
      * <entry>
*)
let lns       = (comment|empty|entry) *

(* Variable: filter *)
let filter    = incl "/etc/security/access.conf"

let xfm       = transform lns filter