Re: [PATCH] semanage: add auditing of changes in records

Common Criteria requirement FMT_MSA.1 needs any configuration change that affect enforcement of policy to be audited. This patch adds auditing of changes in security context mappings for network ports, interfaces, nodes and file contexts. A new function log_change is introduced that audits additions, modification and removal of the mappings via the USER_MAC_CONFIG_CHANGE audit event. The format of the audit events was discussed with the audit userspace maintainer.

This patch resolves: https://bugzilla.redhat.com/show_bug.cgi?id=829175 Signed-off-by: Miroslav Vadkerti <mvadkert(a)redhat.com&gt; --- policycoreutils/semanage/seobject.py | 75 ++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/policycoreutils/semanage/seobject.py b/policycoreutils/semanage/seobject.py index 3b0b108..7d6caa3 100644 --- a/policycoreutils/semanage/seobject.py +++ b/policycoreutils/semanage/seobject.py @@ -82,6 +82,21 @@ file_type_str_to_option = {"all files": "a", "socket file": "s", "symbolic link": "l", "named pipe": "p"} + +proto_to_audit = {"tcp": 17, + "udp": 6, + "ipv4": 4, + "ipv6": 41} + +ftype_to_audit = {"": "any", + "b": "block", + "c": "char", + "d": "dir", + "f": "file", + "l": "symlink", + "p": "pipe", + "s": "socket"} + try: import audit @@ -90,6 +105,7 @@ try: def __init__(self): self.audit_fd = audit.audit_open() self.log_list = [] + self.log_change_list = [] def log(self, msg, name="", sename="", serole="", serange="", oldsename="", oldserole="", oldserange=""): @@ -109,10 +125,17 @@ try: def log_remove(self, msg, name="", sename="", serole="", serange="", oldsename="", oldserole="", oldserange=""): self.log_list.append([self.audit_fd, audit.AUDIT_ROLE_REMOVE, sys.argv[0], str(msg), name, 0, sename, serole, serange, oldsename, oldserole, oldserange, "", "", ""]) + def log_change(self, msg): + self.log_change_list.append([self.audit_fd, audit.AUDIT_USER_MAC_CONFIG_CHANGE, str(msg), "semanage", "", "", ""]) + def commit(self, success): for l in self.log_list: audit.audit_log_semanage_message(*(l + [success])) + for l in self.log_change_list: + audit.audit_log_user_comm_message(*(l + [success])) + self.log_list = [] + self.log_change_list = [] except: class logger: @@ -138,6 +161,9 @@ except: def log_remove(self, msg, name="", sename="", serole="", serange="", oldsename="", oldserole="", oldserange=""): self.log(msg, name, sename, serole, serange, oldsename, oldserole, oldserange) + def log_change(self, msg): + self.log_list.append(" %s" % msg) + def commit(self, success): if success == 1: message = "Successful: " @@ -155,6 +181,9 @@ class nulllogger: def log_remove(self, msg, name="", sename="", serole="", serange="", oldsename="", oldserole="", oldserange=""): pass + def log_change(self, msg): + pass + def commit(self, success): pass @@ -1109,6 +1138,8 @@ class portRecords(semanageRecords): semanage_port_key_free(k) semanage_port_free(p) + self.mylog.log_change("resrc=port op=add lport=%s proto=%s tcontext=%s:%s:%s:%s" % (port, proto_to_audit[proto], "system_u", "object_r", type, serange)) + def add(self, port, proto, serange, type): self.begin() self.__add(port, proto, serange, type) @@ -1150,6 +1181,8 @@ class portRecords(semanageRecords): semanage_port_key_free(k) semanage_port_free(p) + self.mylog.log_change("resrc=port op=modify lport=%s proto=%s tcontext=%s:%s:%s:%s" % (port, proto_to_audit[proto], "system_u", "object_r", setype, serange)) + def modify(self, port, proto, serange, setype): self.begin() self.__modify(port, proto, serange, setype) @@ -1168,6 +1201,7 @@ class portRecords(semanageRecords): low = semanage_port_get_low(port) high = semanage_port_get_high(port) port_str = "%s-%s" % (low, high) + (k, proto_d, low, high) = self.__genkey(port_str, proto_str) if rc < 0: raise ValueError(_("Could not create a key for %s") % port_str) @@ -1177,6 +1211,11 @@ class portRecords(semanageRecords): raise ValueError(_("Could not delete the port %s") % port_str) semanage_port_key_free(k) + if low == high: + port_str = low + + self.mylog.log_change("resrc=port op=delete lport=%s proto=%s" % (port_str, proto_to_audit[proto_str])) + self.commit() def __delete(self, port, proto): @@ -1199,6 +1238,8 @@ class portRecords(semanageRecords): semanage_port_key_free(k) + self.mylog.log_change("resrc=port op=delete lport=%s proto=%s" % (port, proto_to_audit[proto])) + def delete(self, port, proto): self.begin() self.__delete(port, proto) @@ -1380,6 +1421,8 @@ class nodeRecords(semanageRecords): semanage_node_key_free(k) semanage_node_free(node) + self.mylog.log_change("resrc=node op=add laddr=%s netmask=%s proto=%s tcontext=%s:%s:%s:%s" % (addr, mask, proto_to_audit[self.protocol[proto]], "system_u", "object_r", ctype, serange)) + def add(self, addr, mask, proto, serange, ctype): self.begin() self.__add(addr, mask, proto, serange, ctype) @@ -1421,6 +1464,8 @@ class nodeRecords(semanageRecords): semanage_node_key_free(k) semanage_node_free(node) + self.mylog.log_change("resrc=node op=modify laddr=%s netmask=%s proto=%s tcontext=%s:%s:%s:%s" % (addr, mask, proto_to_audit[self.protocol[proto]], "system_u", "object_r", setype, serange)) + def modify(self, addr, mask, proto, serange, setype): self.begin() self.__modify(addr, mask, proto, serange, setype) @@ -1452,6 +1497,8 @@ class nodeRecords(semanageRecords): semanage_node_key_free(k) + self.mylog.log_change("resrc=node op=delete laddr=%s netmask=%s proto=%s" % (addr, mask, proto_to_audit[self.protocol[proto]])) + def delete(self, addr, mask, proto): self.begin() self.__delete(addr, mask, proto) @@ -1581,6 +1628,8 @@ class interfaceRecords(semanageRecords): semanage_iface_key_free(k) semanage_iface_free(iface) + self.mylog.log_change("resrc=interface op=add netif=%s tcontext=%s:%s:%s:%s" % (interface, "system_u", "object_r", ctype, serange)) + def add(self, interface, serange, ctype): self.begin() self.__add(interface, serange, ctype) @@ -1618,6 +1667,8 @@ class interfaceRecords(semanageRecords): semanage_iface_key_free(k) semanage_iface_free(iface) + self.mylog.log_change("resrc=interface op=modify netif=%s tcontext=%s:%s:%s:%s" % (interface, "system_u", "object_r", setype, serange)) + def modify(self, interface, serange, setype): self.begin() self.__modify(interface, serange, setype) @@ -1646,6 +1697,8 @@ class interfaceRecords(semanageRecords): semanage_iface_key_free(k) + self.mylog.log_change("resrc=interface op=delete netif=%s" % interface) + def delete(self, interface): self.begin() self.__delete(interface) @@ -1775,6 +1828,8 @@ class fcontextRecords(semanageRecords): if i.startswith(target + "/"): raise ValueError(_("File spec %s conflicts with equivalency rule '%s %s'") % (target, i, fdict[i])) + self.mylog.log_change("resrc=fcontext op=add-equal %s %s" % (audit.audit_encode_nv_string("sglob", target, 0), audit.audit_encode_nv_string("tglob", substitute, 0))) + self.equiv[target] = substitute self.equal_ind = True self.commit() @@ -1785,6 +1840,9 @@ class fcontextRecords(semanageRecords): raise ValueError(_("Equivalence class for %s does not exists") % target) self.equiv[target] = substitute self.equal_ind = True + + self.mylog.log_change("resrc=fcontext op=modify-equal %s %s" % (audit.audit_encode_nv_string("sglob", target, 0), audit.audit_encode_nv_string("tglob", substitute, 0))) + self.commit() def createcon(self, target, seuser="system_u"): @@ -1879,6 +1937,11 @@ class fcontextRecords(semanageRecords): semanage_fcontext_key_free(k) semanage_fcontext_free(fcontext) + if not seuser: + seuser = "system_u" + + self.mylog.log_change("resrc=fcontext op=add %s ftype=%s tcontext=%s:%s:%s:%s" % (audit.audit_encode_nv_string("tglob", target, 0), ftype_to_audit[ftype], seuser, "object_r", type, serange)) + def add(self, target, type, ftype="", serange="", seuser="system_u"): self.begin() self.__add(target, type, ftype, serange, seuser) @@ -1939,6 +2002,11 @@ class fcontextRecords(semanageRecords): semanage_fcontext_key_free(k) semanage_fcontext_free(fcontext) + if not seuser: + seuser = "system_u" + + self.mylog.log_change("resrc=fcontext op=modify %s ftype=%s tcontext=%s:%s:%s:%s" % (audit.audit_encode_nv_string("tglob", target, 0), ftype_to_audit[ftype], seuser, "object_r", type, serange)) + def modify(self, target, setype, ftype, serange, seuser): self.begin() self.__modify(target, setype, ftype, serange, seuser) @@ -1964,6 +2032,8 @@ class fcontextRecords(semanageRecords): raise ValueError(_("Could not delete the file context %s") % target) semanage_fcontext_key_free(k) + self.mylog.log_change("resrc=fcontext op=delete %s ftype=%s" % (audit.audit_encode_nv_string("tglob", target, 0), ftype_to_audit[ftype_str])) + self.equiv = {} self.equal_ind = True self.commit() @@ -1972,6 +2042,9 @@ class fcontextRecords(semanageRecords): if target in self.equiv.keys(): self.equiv.pop(target) self.equal_ind = True + + self.mylog.log_change("resrc=fcontext op=delete-equal %s ftype=%s" % (audit.audit_encode_nv_string("tglob", target, 0), ftype_to_audit[ftype])) + return (rc, k) = semanage_fcontext_key_create(self.sh, target, file_types[ftype]) @@ -1996,6 +2069,8 @@ class fcontextRecords(semanageRecords): semanage_fcontext_key_free(k) + self.mylog.log_change("resrc=fcontext op=delete %s ftype=%s" % (audit.audit_encode_nv_string("tglob", target, 0), ftype_to_audit[ftype])) + def delete(self, target, ftype): self.begin() self.__delete(target, ftype)