pam_selinux(8)

1PAM_SELINUX(8)                 Linux-PAM Manual                 PAM_SELINUX(8)
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NAME

6       pam_selinux - PAM module to set the default security context
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SYNOPSIS

9       pam_selinux.so [open] [close] [restore] [nottys] [debug] [verbose]
10                      [select_context] [env_params] [use_current_range]
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DESCRIPTION

13       pam_selinux is a PAM module that sets up the default SELinux security
14       context for the next executed process.
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16       When a new session is started, the open_session part of the module
17       computes and sets up the execution security context used for the next
18       execve(2) call, the file security context for the controlling terminal,
19       and the security context used for creating a new kernel keyring.
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21       When the session is ended, the close_session part of the module
22       restores old security contexts that were in effect before the change
23       made by the open_session part of the module.
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25       Adding pam_selinux into the PAM stack might disrupt behavior of other
26       PAM modules which execute applications. To avoid that, pam_selinux.so
27       open should be placed after such modules in the PAM stack, and
28       pam_selinux.so close should be placed before them. When such a
29       placement is not feasible, pam_selinux.so restore could be used to
30       temporary restore original security contexts.
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OPTIONS

33       open
34           Only execute the open_session part of the module.
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36       close
37           Only execute the close_session part of the module.
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39       restore
40           In open_session part of the module, temporarily restore the
41           security contexts as they were before the previous call of the
42           module. Another call of this module without the restore option will
43           set up the new security contexts again.
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45       nottys
46           Do not setup security context of the controlling terminal.
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48       debug
49           Turn on debug messages via syslog(3).
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51       verbose
52           Attempt to inform the user when security context is set.
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54       select_context
55           Attempt to ask the user for a custom security context role. If MLS
56           is on, ask also for sensitivity level.
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58       env_params
59           Attempt to obtain a custom security context role from PAM
60           environment. If MLS is on, obtain also sensitivity level. This
61           option and the select_context option are mutually exclusive. The
62           respective PAM environment variables are SELINUX_ROLE_REQUESTED,
63           SELINUX_LEVEL_REQUESTED, and SELINUX_USE_CURRENT_RANGE. The first
64           two variables are self describing and the last one if set to 1
65           makes the PAM module behave as if the use_current_range was
66           specified on the command line of the module.
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68       use_current_range
69           Use the sensitivity level of the current process for the user
70           context instead of the default level. Also suppresses asking of the
71           sensitivity level from the user or obtaining it from PAM
72           environment.
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MODULE TYPES PROVIDED

75       Only the session module type is provided.
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RETURN VALUES

78       PAM_SUCCESS
79           The security context was set successfully.
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81       PAM_SESSION_ERR
82           Unable to get or set a valid context.
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84       PAM_USER_UNKNOWN
85           The user is not known to the system.
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87       PAM_BUF_ERR
88           Memory allocation error.
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EXAMPLES

91           auth     required  pam_unix.so
92           session  required  pam_permit.so
93           session  optional  pam_selinux.so
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AUTHOR

100       pam_selinux was written by Dan Walsh <dwalsh@redhat.com>.
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104Linux-PAM Manual                  09/03/2021                    PAM_SELINUX(8)