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Add basic info about link rules to apparmor.d man page

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Signed-off-by: John Johansen <john.johansen@canonical.com>
Acked-by: Christian Boltz <apparmor@cboltz.de>
This commit is contained in:
John Johansen 2015-03-24 03:52:51 -07:00
parent c92b5c71e5
commit 4ba7f860ac
1 changed files with 45 additions and 5 deletions
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50
parser/apparmor.d.pod
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@ -54,7 +54,7 @@ B<COMMENT> = '#' I<TEXT>
B<TEXT> = any characters
B<PROFILE> = [ I<COMMENT> ... ] [ I<VARIABLE ASSIGNMENT> ... ] ( '"' I<PROGRAM> '"' | I<PROGRAM> ) [ 'flags=(complain)' ]'{' [ ( I<RESOURCE RULE> | I<COMMENT> | I<INCLUDE> | I<SUBPROFILE> | I<CAPABILITY RULE> | I<NETWORK RULE> | I<MOUNT RULE> | I<PIVOT ROOT RULE> | I<DBUS RULE> | I<UNIX RULE> | I<FILE RULE> | I<CHANGE_PROFILE RULE> ) ... ] '}'
B<PROFILE> = [ I<COMMENT> ... ] [ I<VARIABLE ASSIGNMENT> ... ] ( '"' I<PROGRAM> '"' | I<PROGRAM> ) [ 'flags=(complain)' ]'{' [ ( I<RESOURCE RULE> | I<COMMENT> | I<INCLUDE> | I<SUBPROFILE> | I<CAPABILITY RULE> | I<NETWORK RULE> | I<MOUNT RULE> | I<PIVOT ROOT RULE> | I<DBUS RULE> | I<UNIX RULE> | I<FILE RULE> | I<LINK RULE> | I<CHANGE_PROFILE RULE> ) ... ] '}'
B<SUBPROFILE> = [ I<COMMENT> ... ] ( I<PROGRAMHAT> | 'profile ' I<PROGRAMCHILD> ) '{' [ ( I<FILE RULE> | I<COMMENT> | I<INCLUDE> ) ... ] '}'
@ -165,7 +165,7 @@ B<DBUS ACCESS> = ( 'send' | 'receive' | 'bind' | 'eavesdrop' ) (some accesses a
B<AARE> = B<?*[]{}^> (see below for meanings)
B<UNIX RILE> = [ I<QUALIFIERS> ] 'unix' [ I<UNIX ACCESS EXPR> ] [ I<UNIX RULE CONDS> ] [ I<UNIX LOCAL EXPR> ] [ I<UNIX PEER EXPR> ]
B<UNIX RULE> = [ I<QUALIFIERS> ] 'unix' [ I<UNIX ACCESS EXPR> ] [ I<UNIX RULE CONDS> ] [ I<UNIX LOCAL EXPR> ] [ I<UNIX PEER EXPR> ]
B<UNIX ACCESS EXPR> = ( I<UNIX ACCESS> | I<UNIX ACCESS LIST> )
@ -205,6 +205,8 @@ B<EXEC TRANSITION> = ( 'ix' | 'ux' | 'Ux' | 'px' | 'Px' | 'cx' | 'Cx' | 'pix' |
B<EXEC TARGET> = name (requires I<EXEC TRANSITION> specified)
B<LINK RULE> = I<QUALIFIERS> [ 'owner' ] 'link' [ 'subset' ] <FILEGLOB> ( 'to' | '-E<gt>' ) <FILEGLOB> ','
B<VARIABLE> = '@{' I<ALPHA> [ ( I<ALPHANUMERIC> | '_' ) ... ] '}'
B<VARIABLE ASSIGNMENT> = I<VARIABLE> ('=' | '+=') (space separated values)
@ -504,9 +506,9 @@ B<LD_LIBRARY_PATH>, given to ld.so(8).
Allows the program to be able to create a link with this name. When a
link is created, the new link B<MUST> have a subset of permissions as
the original file (with the exception that
the destination does not have to have link access.) If there is an 'x' rule
on the new link, it must match the original file exactly.
the original file (with the exception that the destination does not have
to have link access.) If there is an 'x' rule on the new link, it must
match the original file exactly.
=item B<k - lock mode>
@ -528,6 +530,44 @@ may be allowed, Eg.
=back
=head2 Link rules
Link rules allow specifying permission to form a hard link as a link
target pair. If the subset condition is specified then the permissions
to access the link file must be a subset of the profiles permissions
to access the target file. If there is an 'x' rule on the new link, it
must match the original file exactly.
Eg.
/file1 r,
/file2 rwk,
/link* rw,
link subset /link* -> /**,
The link rule allows linking of /link to both /file1 or /file2 by
name however because the /link file has 'rw' permissions it is not
allowed to link to /file1 because that would grant an access path
to /file1 with more permissions than the 'r' permissions the profile
specifies.
A link of /link to /file2 would be allowed because the 'rw' permissions
of /link are a subset of the 'rwk' permissions for /file1.
The link rule is equivalent to specifying the 'l' link permission as
a leading permission with no other file access permissions. When this
is done the link rule options can be specified.
The following link rule is equivalent to the 'l' permission file rule
link /foo -> bar,
l /foo -> /bar,
File rules that specify the 'l' permission and don't specify the extend
link permissions map to link rules as follows.
/foo l,
l /foo,
link subset /foo -> /**,
=head2 Comments
Comments start with # and may begin at any place within a line. The