[PATCH] python/sepolgen: Try to translate SELinux contexts to raw

[Vit Mojzis]

This allows sepolgen to generate policy from AVC messages that contain
contexts translated by mcstrans.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1356149

Signed-off-by: Vit Mojzis <***@redhat.com>
---
python/sepolgen/src/sepolgen/refpolicy.py | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/python/sepolgen/src/sepolgen/refpolicy.py b/python/sepolgen/src/sepolgen/refpolicy.py
index 2ee029c1..352b1878 100644
--- a/python/sepolgen/src/sepolgen/refpolicy.py
+++ b/python/sepolgen/src/sepolgen/refpolicy.py
@@ -284,6 +284,11 @@ class SecurityContext(Leaf):

Raises ValueError if the string is not parsable as a security context.
"""
+ # try to translate the context string to raw form
+ raw = selinux.selinux_trans_to_raw_context(context)
+ if raw[0] == 0:
+ context = raw[1]
+
fields = context.split(":")
if len(fields) < 3:
raise ValueError("context string [%s] not in a valid format" % context)

[Stephen Smalley]

Post by Vit Mojzis
This allows sepolgen to generate policy from AVC messages that contain
contexts translated by mcstrans.
Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1356149

Not friendly to cite a non-public bugzilla.

Post by Vit Mojzis
---
python/sepolgen/src/sepolgen/refpolicy.py | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/python/sepolgen/src/sepolgen/refpolicy.py b/python/sepolgen/src/sepolgen/refpolicy.py
index 2ee029c1..352b1878 100644
--- a/python/sepolgen/src/sepolgen/refpolicy.py
+++ b/python/sepolgen/src/sepolgen/refpolicy.py
Raises ValueError if the string is not parsable as a security context.
"""
+ # try to translate the context string to raw form
+ raw = selinux.selinux_trans_to_raw_context(context)
+ context = raw[1]
+
fields = context.split(":")
raise ValueError("context string [%s] not in a valid format" % context)

[Vit Mojzis]

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 <***@redhat.com>
---
python/sepolgen/src/sepolgen/refpolicy.py | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/python/sepolgen/src/sepolgen/refpolicy.py b/python/sepolgen/src/sepolgen/refpolicy.py
index 2ee029c1..352b1878 100644
--- a/python/sepolgen/src/sepolgen/refpolicy.py
+++ b/python/sepolgen/src/sepolgen/refpolicy.py
@@ -284,6 +284,11 @@ class SecurityContext(Leaf):

Raises ValueError if the string is not parsable as a security context.
"""
+ # try to translate the context string to raw form
+ raw = selinux.selinux_trans_to_raw_context(context)
+ if raw[0] == 0:
+ context = raw[1]
+
fields = context.split(":")
if len(fields) < 3:
raise ValueError("context string [%s] not in a valid format" % context)