sepolgen uses "return NotImplemented" (in access.py and matching.py) in
order to make Python's sorting function use an other call to compare
objects. For this to work, "NotImplemented" needs to be returned, not
raised like _compare's default implementation does.
This issue has been found using flake8. This Python linter reported:
python/sepolgen/src/sepolgen/util.py:128:9: F901 'raise
NotImplemented' should be 'raise NotImplementedError'
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
util.py starts by importing "locale" and "sys", so there is no need to
import these modules again in the functions.
Signed-off-by: Nicolas Iooss <nicolas.iooss@m4x.org>
Add support for extended permissions to audit2allow. Extend AuditParser
to parse the 'ioctlcmd' field in AVC message. Extend PolicyGenerator to
generate allowxperm rules. Add the '-x'/'--xperms' option to audit2allow
to turn on generating of extended permission AV rules.
AVCMessage parses the ioctlcmd field in AVC messages. AuditParser
converts the ioctlcmd values into generic representation of extended
permissions that is stored in access vectors.
Extended permissions are represented by operations (currently only
'ioctl') and values associated to the operations. Values (for example
'~{ 0x42 1234 23-34 }') are stored in the XpermSet class.
PolicyGenerator contains new method to turn on generating of xperms.
When turned on, for each access vector, standard AV rule and possibly
several xperm AV rules are generated. Xperm AV rules are represented by
the AVExtRule class.
With xperm generating turned off, PolicyGenerator provides comments
about extended permissions in certain situations. When the AVC message
contains the ioctlcmd field and the access would be allowed according to
the policy, PolicyGenerator warns about xperm rules being the possible
cause of the denial.
Signed-off-by: Jan Zarsky <jzarsky@redhat.com>
In access module, in AccessVector.__init__() method, when init_list is
not None, the access vector is initialized by from_list() method.
However, this method does not assign attributes self.audit_msgs,
self.type, and self.data. Fix this by assigning these attributes in
__init__() method.
Signed-off-by: Jan Zarsky <jzarsky@redhat.com>
In refpolicy module, in AVRule.__rule_type_str() method, self.rule_type
was not checked for value self.NEVERALLOW so that string "neverallow"
was never returned. Fix this by checking all four possible values and
returning correct strings.
Signed-off-by: Jan Zarsky <jzarsky@redhat.com>
This allows sepolgen to generate policy from AVC messages that contain
contexts translated by mcstrans.
Fixes:
\# echo "type=USER_AVC msg=audit(1468415802.940:2199604): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0-s15:c0.c1023 msg='avc: denied { status } for auid=n/a uid=0 gid=0 cmdline="/usr/lib/systemd/systemd-logind" scontext=system_u:system_r:systemd_logind_t:SystemLow-SystemHigh tcontext=system_u:system_r:init_t:s0-s15:c0.c1023 tclass=system exe="/usr/lib/systemd/systemd" sauid=0 hostname=? addr=? terminal=?'" | audit2allow
libsepol.mls_from_string: invalid MLS context SystemLow-SystemHigh
libsepol.mls_from_string: could not construct mls context structure
libsepol.context_from_record: could not create context structure
libsepol.context_from_string: could not create context structure
libsepol.sepol_context_to_sid: could not convert
system_u:system_r:systemd_logind_t:SystemLow-SystemHigh to sid
Signed-off-by: Vit Mojzis <vmojzis@redhat.com>
https://docs.python.org/3/whatsnew/3.6.html#deprecated-python-behavior
A backslash-character pair that is not a valid escape sequence now
generates a DeprecationWarning. Although this will eventually become a
SyntaxError, that will not be for several Python releases.
The problem appears when you use '-W error':
$ python3 -W error -c 'import re; re.findall("[^a-zA-Z0-9_\-\.]", " *%$")'
File "<string>", line 1
SyntaxError: invalid escape sequence \-
Signed-off-by: Ville Skyttä <ville.skytta@iki.fi>
[ Edited commit message as per suggestion from Petr Lautrbach ]
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>
Strip the following characters
\x1c File Separator
\x1d Group Separator
\x1e Record Separator
\x85 Next Line (C1 Control Code)
from audit message fields to make sure they are not evaluated
as part of some identifier (eg. ausearch used insert \x1d into
--raw output resulting in "unrecognized class" error messages).
This is done as part of str.split() in python3.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1406328
