245 lines
10 KiB
Diff
245 lines
10 KiB
Diff
diff --git a/sepolgen-1.2.2/src/sepolgen/access.py b/sepolgen-1.2.2/src/sepolgen/access.py
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index cf13210..9154887 100644
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--- a/sepolgen-1.2.2/src/sepolgen/access.py
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+++ b/sepolgen-1.2.2/src/sepolgen/access.py
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@@ -88,6 +88,8 @@ class AccessVector:
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self.audit_msgs = []
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self.type = audit2why.TERULE
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self.data = []
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+ self.obj_path = None
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+ self.base_type = None
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# The direction of the information flow represented by this
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# access vector - used for matching
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@@ -133,6 +135,11 @@ class AccessVector:
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return "allow %s %s:%s %s;" % (self.src_type, self.tgt_type,
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self.obj_class, self.perms.to_space_str())
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+ def base_file_type(self):
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+ base_type_array = []
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+ base_type_array = [self.base_type, self.tgt_type, self.src_type]
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+ return base_type_array
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+
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def __cmp__(self, other):
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if self.src_type != other.src_type:
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return cmp(self.src_type, other.src_type)
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@@ -256,7 +263,8 @@ class AccessVectorSet:
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for av in l:
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self.add_av(AccessVector(av))
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- def add(self, src_type, tgt_type, obj_class, perms, audit_msg=None, avc_type=audit2why.TERULE, data=[]):
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+ def add(self, src_type, tgt_type, obj_class, perms, obj_path=None,
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+ base_type=None, audit_msg=None, avc_type=audit2why.TERULE, data=[]):
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"""Add an access vector to the set.
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"""
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tgt = self.src.setdefault(src_type, { })
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@@ -269,7 +277,9 @@ class AccessVectorSet:
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access.src_type = src_type
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access.tgt_type = tgt_type
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access.obj_class = obj_class
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+ access.obj_path = obj_path
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access.data = data
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+ access.base_type = base_type
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access.type = avc_type
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cls[obj_class, avc_type] = access
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diff --git a/sepolgen-1.2.2/src/sepolgen/audit.py b/sepolgen-1.2.2/src/sepolgen/audit.py
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index 56919be..57263d0 100644
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--- a/sepolgen-1.2.2/src/sepolgen/audit.py
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+++ b/sepolgen-1.2.2/src/sepolgen/audit.py
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@@ -169,6 +169,7 @@ class AVCMessage(AuditMessage):
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self.exe = ""
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self.path = ""
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self.name = ""
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+ self.ino = ""
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self.accesses = []
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self.denial = True
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self.type = audit2why.TERULE
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@@ -230,6 +231,10 @@ class AVCMessage(AuditMessage):
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self.exe = fields[1][1:-1]
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elif fields[0] == "name":
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self.name = fields[1][1:-1]
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+ elif fields[0] == "path":
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+ self.path = fields[1][1:-1]
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+ elif fields[0] == "ino":
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+ self.ino = fields[1]
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if not found_src or not found_tgt or not found_class or not found_access:
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raise ValueError("AVC message in invalid format [%s]\n" % self.message)
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@@ -354,7 +359,9 @@ class AuditParser:
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self.path_msgs = []
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self.by_header = { }
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self.check_input_file = False
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-
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+ self.inode_dict = { }
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+ self.__store_base_types()
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+
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# Low-level parsing function - tries to determine if this audit
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# message is an SELinux related message and then parses it into
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# the appropriate AuditMessage subclass. This function deliberately
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@@ -492,6 +499,60 @@ class AuditParser:
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return role_types
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+ def __restore_path(self, name, inode):
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+ import subprocess
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+ import os
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+ path = ""
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+ # Optimizing
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+ if name == "" or inode == "":
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+ return path
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+ for d in self.inode_dict:
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+ if d == inode and self.inode_dict[d] == name:
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+ return path
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+ if d == inode and self.inode_dict[d] != name:
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+ return self.inode_dict[d]
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+ if inode not in self.inode_dict.keys():
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+ self.inode_dict[inode] = name
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+
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+ command = "locate -b '\%s'" % name
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+ try:
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+ output = subprocess.check_output(command,
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+ stderr=subprocess.STDOUT,
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+ shell=True)
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+ try:
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+ ino = int(inode)
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+ except ValueError:
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+ pass
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+ for file in output.split("\n"):
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+ try:
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+ if int(os.lstat(file).st_ino) == ino:
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+ self.inode_dict[inode] = path = file
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+ return path
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+ except:
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+ pass
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+ except subprocess.CalledProcessError as e:
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+ pass
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+ return path
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+
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+ def __store_base_types(self):
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+ import sepolicy
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+ self.base_types = sepolicy.get_types_from_attribute("base_file_type")
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+
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+ def __get_base_type(self, tcontext, scontext):
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+ import sepolicy
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+ # Prevent unnecessary searching
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+ if (self.old_scontext == scontext and
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+ self.old_tcontext == tcontext):
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+ return
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+ self.old_scontext = scontext
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+ self.old_tcontext = tcontext
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+ for btype in self.base_types:
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+ if btype == tcontext:
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+ for writable in sepolicy.get_writable_files(scontext):
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+ if writable.endswith(tcontext) and writable.startswith(scontext.rstrip("_t")):
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+ return writable
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+ return 0
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+
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def to_access(self, avc_filter=None, only_denials=True):
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"""Convert the audit logs access into a an access vector set.
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@@ -510,16 +571,23 @@ class AuditParser:
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audit logs parsed by this object.
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"""
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av_set = access.AccessVectorSet()
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+ self.old_scontext = ""
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+ self.old_tcontext = ""
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for avc in self.avc_msgs:
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if avc.denial != True and only_denials:
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continue
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+ base_type = self.__get_base_type(avc.tcontext.type, avc.scontext.type)
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+ if avc.path == "":
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+ avc.path = self.__restore_path(avc.name, avc.ino)
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if avc_filter:
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if avc_filter.filter(avc):
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av_set.add(avc.scontext.type, avc.tcontext.type, avc.tclass,
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- avc.accesses, avc, avc_type=avc.type, data=avc.data)
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+ avc.accesses, avc.path, base_type, avc,
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+ avc_type=avc.type, data=avc.data)
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else:
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av_set.add(avc.scontext.type, avc.tcontext.type, avc.tclass,
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- avc.accesses, avc, avc_type=avc.type, data=avc.data)
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+ avc.accesses, avc.path, base_type, avc,
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+ avc_type=avc.type, data=avc.data)
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return av_set
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class AVCTypeFilter:
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diff --git a/sepolgen-1.2.2/src/sepolgen/policygen.py b/sepolgen-1.2.2/src/sepolgen/policygen.py
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index 5f38577..3b9e9f4 100644
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--- a/sepolgen-1.2.2/src/sepolgen/policygen.py
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+++ b/sepolgen-1.2.2/src/sepolgen/policygen.py
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@@ -81,8 +81,9 @@ class PolicyGenerator:
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self.module = refpolicy.Module()
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self.dontaudit = False
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-
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+ self.mislabled = None
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self.domains = None
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+
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def set_gen_refpol(self, if_set=None, perm_maps=None):
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"""Set whether reference policy interfaces are generated.
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@@ -152,6 +153,18 @@ class PolicyGenerator:
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"""Return the generated module"""
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return self.module
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+ def __restore_label(self, av):
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+ import selinux
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+ try:
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+ context = selinux.matchpathcon(av.obj_path, 0)
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+ split = context[1].split(":")[2]
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+ if split != av.tgt_type:
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+ self.mislabled = split
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+ return
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+ except OSError:
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+ pass
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+ self.mislabled = None
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+
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def __add_allow_rules(self, avs):
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for av in avs:
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rule = refpolicy.AVRule(av)
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@@ -160,6 +173,34 @@ class PolicyGenerator:
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rule.comment = ""
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if self.explain:
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rule.comment = str(refpolicy.Comment(explain_access(av, verbosity=self.explain)))
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+ # base_type[0] == 0 means there exists a base type but not the path
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+ # base_type[0] == None means user isn't using base type
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+ # base_type[1] contains the target context
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+ # base_type[2] contains the source type
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+ base_type = av.base_file_type()
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+ if base_type[0] == 0 and av.type != audit2why.ALLOW:
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+ rule.comment += "\n#!!!! WARNING: '%s' is a base type." % "".join(base_type[1])
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+ for perm in av.perms:
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+ if perm == "write" or perm == "create":
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+ permission = True
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+ break
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+ else:
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+ permission = False
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+
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+ # Catch perms 'write' and 'create' for base types
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+ if (base_type[0] is not None and base_type[0] != 0
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+ and permission and av.type != audit2why.ALLOW):
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+ if av.obj_class == dir:
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+ comp = "(/.*?)"
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+ else:
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+ comp = ""
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+ rule.comment += "\n#!!!! WARNING '%s' is not allowed to write or create to %s. Change the label to %s." % ("".join(base_type[2]), "".join(base_type[1]), "".join(base_type[0]))
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+ if av.obj_path != "":
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+ rule.comment += "\n#!!!! $ semange fcontext -a -t %s %s%s \n#!!!! $ restorecon -R -v %s" % ("".join(base_type[0]), "".join(av.obj_path), "".join(comp) ,"".join(av.obj_path))
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+
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+ self.__restore_label(av)
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+ if self.mislabled is not None and av.type != audit2why.ALLOW:
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+ rule.comment += "\n#!!!! The file '%s' is mislabeled on your system. \n#!!!! Fix with $ restorecon -R -v %s" % ("".join(av.obj_path), "".join(av.obj_path))
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if av.type == audit2why.ALLOW:
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rule.comment += "\n#!!!! This avc is allowed in the current policy"
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if av.type == audit2why.DONTAUDIT:
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@@ -174,7 +215,7 @@ class PolicyGenerator:
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if av.type == audit2why.CONSTRAINT:
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rule.comment += "\n#!!!! This avc is a constraint violation. You would need to modify the attributes of either the source or target types to allow this access."
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rule.comment += "\n#Constraint rule: "
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- rule.comment += "\n\t" + av.data[0]
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+ rule.comment += "\n#\t" + av.data[0]
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for reason in av.data[1:]:
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rule.comment += "\n#\tPossible cause is the source %s and target %s are different." % reason
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