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From c556c6ad0b94cf3ba4b441a1a0930f2468434227 Mon Sep 17 00:00:00 2001
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From: Vit Mojzis <vmojzis@redhat.com>
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Date: Wed, 10 Feb 2021 18:05:29 +0100
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Subject: [PATCH] selinux(8,5): Describe fcontext regular expressions
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Describe which type of regular expression is used in file context
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definitions and which flags are in effect.
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Explain how local file context modifications are processed.
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Signed-off-by: Vit Mojzis <vmojzis@redhat.com>
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Acked-by: Petr Lautrbach <plautrba@redhat.com>
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---
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python/semanage/semanage | 2 +-
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python/semanage/semanage-fcontext.8 | 18 ++++++++++++++++++
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2 files changed, 19 insertions(+), 1 deletion(-)
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diff --git a/python/semanage/semanage b/python/semanage/semanage
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index 781e8645..ebb93ea5 100644
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--- a/python/semanage/semanage
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+++ b/python/semanage/semanage
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@@ -366,7 +366,7 @@ If you do not specify a file type, the file type will default to "all files".
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parser_add_seuser(fcontextParser, "fcontext")
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parser_add_type(fcontextParser, "fcontext")
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parser_add_range(fcontextParser, "fcontext")
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- fcontextParser.add_argument('file_spec', nargs='?', default=None, help=_('file_spec'))
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+ fcontextParser.add_argument('file_spec', nargs='?', default=None, help=_('Path to be labeled (may be in the form of a Perl compatible regular expression)'))
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fcontextParser.set_defaults(func=handleFcontext)
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diff --git a/python/semanage/semanage-fcontext.8 b/python/semanage/semanage-fcontext.8
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index 561123af..49635ba7 100644
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--- a/python/semanage/semanage-fcontext.8
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+++ b/python/semanage/semanage-fcontext.8
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@@ -11,6 +11,24 @@ SELinux policy without requiring modification to or recompilation
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from policy sources. semanage fcontext is used to manage the default
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file system labeling on an SELinux system. This command maps file paths using regular expressions to SELinux labels.
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+FILE_SPEC may contain either a fully qualified path,
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+or a Perl compatible regular expression (PCRE),
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+describing fully qualified path(s). The only PCRE flag in use is PCRE2_DOTALL,
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+which causes a wildcard '.' to match anything, including a new line.
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+Strings representing paths are processed as bytes (as opposed to Unicode),
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+meaning that non-ASCII characters are not matched by a single wildcard.
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+
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+Note, that file context definitions specified using 'semanage fcontext'
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+(i.e. local file context modifications stored in file_contexts.local)
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+have higher priority than those specified in policy modules.
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+This means that whenever a match for given file path is found in
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+file_contexts.local, no other file context definitions are considered.
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+Entries in file_contexts.local are processed from most recent one to the oldest,
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+with first match being used (as opposed to the most specific match,
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+which is used when matching other file context definitions).
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+All regular expressions should therefore be as specific as possible,
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+to avoid unintentionally impacting other parts of the filesystem.
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+
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.SH "OPTIONS"
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.TP
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.I \-h, \-\-help
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--
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2.29.2
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