3b931f7861
svn path=/nixos/trunk/; revision=16731
157 lines
5.4 KiB
Nix
157 lines
5.4 KiB
Nix
# This module provides configuration for the PAM (Pluggable
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# Authentication Modules) system.
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{config, pkgs, ...}:
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with pkgs.lib;
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let
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inherit (pkgs) pam_unix2 pam_console pam_ldap;
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# !!! ugh, these files shouldn't be created here.
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pamConsoleHandlers = pkgs.writeText "console.handlers" ''
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console consoledevs /dev/tty[0-9][0-9]* :[0-9]\.[0-9] :[0-9]
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${pkgs.pam_console}/sbin/pam_console_apply lock logfail wait -t tty -s -c ${pamConsolePerms}
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${pkgs.pam_console}/sbin/pam_console_apply unlock logfail wait -r -t tty -s -c ${pamConsolePerms}
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'';
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pamConsolePerms = ./console.perms;
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otherService = pkgs.writeText "other.pam"
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''
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auth required pam_warn.so
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auth required pam_deny.so
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account required pam_warn.so
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account required pam_deny.so
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password required pam_warn.so
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password required pam_deny.so
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session required pam_warn.so
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session required pam_deny.so
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'';
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makePAMService =
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{ name
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, # If set, root doesn't need to authenticate (e.g. for the "chsh"
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# service).
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rootOK ? false
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, # If set, this is a local login (e.g. virtual console or X), so
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# the user gets ownership of audio devices etc.
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localLogin ? false
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, # Whether to forward XAuth keys between users. Mostly useful
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# for "su".
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forwardXAuth ? false
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}:
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{ source = pkgs.writeText "${name}.pam"
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# !!! TODO: move the LDAP stuff to the LDAP module, and the
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# Samba stuff to the Samba module. This requires that the PAM
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# module provides the right hooks.
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''
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# Account management.
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${optionalString config.users.ldap.enable
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"account optional ${pam_ldap}/lib/security/pam_ldap.so"}
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account required ${pam_unix2}/lib/security/pam_unix2.so
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# Authentication management.
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${optionalString rootOK
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"auth sufficient pam_rootok.so"}
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${optionalString config.users.ldap.enable
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"auth sufficient ${pam_ldap}/lib/security/pam_ldap.so"}
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auth sufficient ${pam_unix2}/lib/security/pam_unix2.so
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auth required pam_deny.so
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# Password management.
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${optionalString config.users.ldap.enable
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"password sufficient ${pam_ldap}/lib/security/pam_ldap.so"}
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password requisite ${pam_unix2}/lib/security/pam_unix2.so nullok
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${optionalString config.services.samba.syncPasswordsByPam
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"password optional ${pkgs.samba}/lib/security/pam_smbpass.so nullok use_authtok try_first_pass"}
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# Session management.
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${optionalString config.users.ldap.enable
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"session optional ${pam_ldap}/lib/security/pam_ldap.so"}
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session required ${pam_unix2}/lib/security/pam_unix2.so
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${optionalString localLogin
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"session optional ${pam_console}/lib/security/pam_console.so debug handlersfile=${pamConsoleHandlers}"}
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${optionalString forwardXAuth
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"session optional pam_xauth.so xauthpath=${pkgs.xorg.xauth}/bin/xauth systemuser=99"}
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'';
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target = "pam.d/${name}";
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};
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in
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{
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###### interface
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options = {
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security.pam.services = mkOption {
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default = [];
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example = [ { name = "chsh"; rootOK = true; } ];
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description =
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''
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This option defines the PAM services. A service typically
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corresponds to a program that uses PAM,
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e.g. <command>login</command> or <command>passwd</command>.
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Each element of this list is an attribute set describing a
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service. The attribute <varname>name</varname> specifies
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the name of the service. The attribute
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<varname>rootOK</varname> specifies whether the root user is
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allowed to use this service without authentication. The
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attribute <varname>localLogin</varname> specifies whether
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this is a local login service (e.g. <command>xdm</command>),
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which implies that the user gets ownership of devices such
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as audio and CD-ROM drives. The
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attribute <varname>forwardXAuth</varname> specifies whether
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X authentication keys should be passed from the calling user
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to the target user (e.g. for <command>su</command>).
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'';
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};
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};
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###### implementation
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config = {
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environment.systemPackages =
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# Include the PAM modules in the system path mostly for the manpages.
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[ pkgs.pam pam_unix2 ]
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++ optional config.users.ldap.enable pam_ldap;
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environment.etc =
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map makePAMService config.security.pam.services
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++ singleton
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{ source = otherService;
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target = "pam.d/other";
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};
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security.pam.services =
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# Most of these should be moved to specific modules.
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[ { name = "cups"; }
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{ name = "ejabberd"; }
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{ name = "ftp"; }
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{ name = "lshd"; }
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{ name = "passwd"; }
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{ name = "samba"; }
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{ name = "sshd"; }
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{ name = "xlock"; }
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{ name = "chsh"; rootOK = true; }
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{ name = "su"; rootOK = true; forwardXAuth = true; }
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# Note: useradd, groupadd etc. aren't setuid root, so it
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# doesn't really matter what the PAM config says as long as it
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# lets root in.
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{ name = "useradd"; rootOK = true; }
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# Used by groupadd etc.
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{ name = "shadow"; rootOK = true; }
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{ name = "login"; localLogin = true; }
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];
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};
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}
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