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Signed-off-by: Guillem Jover <guillem@debian.org>
Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Dan Walsh <dwalsh@redhat.com>
100 lines
2.7 KiB
Groff
100 lines
2.7 KiB
Groff
.TH "getcon" "3" "21 December 2011" "russell@coker.com.au" "SELinux API documentation"
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.SH "NAME"
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getcon, getprevcon, getpidcon \- get SELinux security context of a process
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freecon, freeconary \- free memory associated with SELinux security contexts
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getpeercon \- get security context of a peer socket
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setcon \- set current security context of a process
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.
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.SH "SYNOPSIS"
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.B #include <selinux/selinux.h>
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.sp
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.BI "int getcon(security_context_t *" context );
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.sp
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.BI "int getprevcon(security_context_t *" context );
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.sp
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.BI "int getpidcon(pid_t " pid ", security_context_t *" context );
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.sp
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.BI "int getpeercon(int " fd ", security_context_t *" context );
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.sp
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.BI "void freecon(security_context_t "con );
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.sp
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.BI "void freeconary(security_context_t *" con );
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.sp
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.BI "int setcon(security_context_t " context );
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.
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.SH "DESCRIPTION"
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.BR getcon ()
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retrieves the context of the current process, which must be free'd with
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freecon.
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.BR getprevcon ()
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same as getcon but gets the context before the last exec.
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.BR getpidcon ()
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returns the process context for the specified PID.
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.BR getpeercon ()
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retrieves context of peer socket, and set
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.BI * context
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to refer to it, which must be free'd with
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.BR freecon ().
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.BR freecon ()
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frees the memory allocated for a security context.
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.BR freeconary ()
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frees the memory allocated for a context array.
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If
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.I con
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is NULL, no operation is performed.
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.BR setcon ()
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sets the current security context of the process to a new value. Note
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that use of this function requires that the entire application be
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trusted to maintain any desired separation between the old and new
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security contexts, unlike exec-based transitions performed via
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.BR setexeccon (3).
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When possible, decompose your application and use
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.BR setexeccon (3)
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and
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.BR execve (3)
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instead.
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Since access to file descriptors is revalidated upon use by SELinux,
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the new context must be explicitly authorized in the policy to use the
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descriptors opened by the old context if that is desired. Otherwise,
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attempts by the process to use any existing descriptors (including
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.IR stdin ,
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.IR stdout ,
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and
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.IR stderr )
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after performing the
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.BR setcon ()
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will fail.
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A multi-threaded application can perform a
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.BR setcon ()
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prior to creating
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any child threads, in which case all of the child threads will inherit
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the new context. However,
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.BR setcon ()
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will fail if there are any other
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threads running in the same process.
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If the process was being ptraced at the time of the
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.BR setcon ()
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operation, ptrace permission will be revalidated against the new
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context and the
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.BR setcon ()
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will fail if it is not allowed by policy.
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.
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.SH "RETURN VALUE"
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On error \-1 is returned. On success 0 is returned.
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.
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.SH "SEE ALSO"
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.BR selinux "(8), " setexeccon "(3)"
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