mirror of
https://github.com/SELinuxProject/selinux
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a782abf226
Operating on a file descriptor avoids TOCTOU issues and one opened via
O_PATH avoids the requirement of having read access to the file. Since
Linux does not natively support file descriptors opened via O_PATH in
fgetxattr(2) and at least glibc and musl does not emulate O_PATH support
in their implementations, fgetfilecon(3) and fsetfilecon(3) also do not
currently support file descriptors opened with O_PATH.
Inspired by CVE-2013-4392: https://github.com/systemd/systemd/pull/8583
Implementation adapted from: 2825f10b7f%5E%21/
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
Acked-by: James Carter <jwcart2@gmail.com>
75 lines
1.9 KiB
Groff
75 lines
1.9 KiB
Groff
.TH "getfilecon" "3" "1 January 2004" "russell@coker.com.au" "SELinux API documentation"
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.SH "NAME"
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getfilecon, fgetfilecon, lgetfilecon \- get SELinux security context of a file
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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 getfilecon(const char *" path ", char **" con );
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.sp
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.BI "int getfilecon_raw(const char *" path ", char **" con );
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.sp
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.BI "int lgetfilecon(const char *" path ", char **" con );
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.sp
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.BI "int lgetfilecon_raw(const char *" path ", char **" con );
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.sp
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.BI "int fgetfilecon(int "fd ", char **" con );
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.sp
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.BI "int fgetfilecon_raw(int "fd ", char **" con );
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.
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.SH "DESCRIPTION"
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.BR getfilecon ()
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retrieves the context associated with the given path in the file system, the
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length of the context is returned.
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.BR lgetfilecon ()
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is identical to
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.BR getfilecon (),
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except in the case of a symbolic link, where the
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link itself is interrogated, not the file that it refers to.
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.BR fgetfilecon ()
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is identical to
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.BR getfilecon (),
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only the open file pointed to by filedes (as returned by
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.BR open (2))
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is interrogated in place of path. Since libselinux 3.4 a file opened via
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.I O_PATH
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is supported.
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.BR getfilecon_raw (),
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.BR lgetfilecon_raw ()
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and
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.BR fgetfilecon_raw ()
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behave identically to their non-raw counterparts but do not perform context
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translation.
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The returned context should be freed with
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.BR freecon (3)
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if non-NULL.
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.
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.SH "RETURN VALUE"
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On success, a positive number is returned indicating the size of the
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extended attribute value. On failure, \-1 is returned and
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.I errno
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is set appropriately.
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If the context does not exist, or the process has no access to
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this attribute,
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.I errno
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is set to
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.BR ENODATA .
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If extended attributes are not supported by the filesystem, or are
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disabled,
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.I errno
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is set to
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.BR ENOTSUP .
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The errors documented for the
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.BR stat (2)
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system call are also applicable here.
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.
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.SH "SEE ALSO"
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.BR selinux "(8), " freecon "(3), " setfilecon "(3), " setfscreatecon "(3)"
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