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libsepol/cil: Fix anonymous IP address call arguments

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A named IP address (using an ipaddr rule) could be passed as an
argument, but trying to pass an actual IP address caused an error.

As an exmample, consider the following portion of a policy.
  (macro m4 ((ipaddr ip)(ipaddr nm))
    (nodecon ip nm (USER ROLE TYPE ((s0) (s0))))
  )
  (ipaddr nm1 255.255.255.0)
  (ipaddr ip1 1.2.3.4)
  (call m4 (ip1 nm1)) ; This works
  (call m4 (1.2.3.4 255.255.255.0)) ; This doesn't

Allow actual IP addresses to be passed as a call argument. Now the
second call works as well.

Signed-off-by: James Carter <jwcart2@gmail.com>
Acked-by: Nicolas Iooss <nicolas.iooss@m4x.org>
This commit is contained in:
James Carter 2021-06-14 12:53:25 -04:00
parent 6bff61c598
commit 9ac9d2dab4
2 changed files with 10 additions and 17 deletions
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4
libsepol/cil/src/cil_build_ast.c
View file

@ -5642,10 +5642,6 @@ int cil_fill_ipaddr(struct cil_tree_node *addr_node, struct cil_ipaddr *addr)
goto exit;
}
if (addr_node->cl_head != NULL || addr_node->next != NULL) {
goto exit;
}
if (strchr(addr_node->data, '.') != NULL) {
addr->family = AF_INET;
} else {

23
libsepol/cil/src/cil_resolve_ast.c
View file

@ -3024,14 +3024,18 @@ static int cil_build_call_args(struct cil_tree_node *call_node, struct cil_call
break;
}
case CIL_IPADDR: {
if (arg_node->cl_head != NULL) {
if (arg_node->data == NULL) {
cil_tree_log(call_node, CIL_ERR, "Invalid macro parameter");
cil_destroy_args(arg);
rc = SEPOL_ERR;
goto exit;
} else if (strchr(arg_node->data, '.') || strchr(arg_node->data, ':')) {
struct cil_ipaddr *ipaddr = NULL;
struct cil_tree_node *addr_node = NULL;
cil_ipaddr_init(&ipaddr);
rc = cil_fill_ipaddr(arg_node->cl_head, ipaddr);
rc = cil_fill_ipaddr(arg_node, ipaddr);
if (rc != SEPOL_OK) {
cil_log(CIL_ERR, "Failed to create anonymous ip address, rc: %d\n", rc);
cil_tree_log(call_node, CIL_ERR, "Failed to create anonymous ip address");
cil_destroy_ipaddr(ipaddr);
cil_destroy_args(arg);
goto exit;
@ -3039,18 +3043,11 @@ static int cil_build_call_args(struct cil_tree_node *call_node, struct cil_call
cil_tree_node_init(&addr_node);
addr_node->flavor = CIL_IPADDR;
addr_node->data = ipaddr;
cil_list_append(((struct cil_symtab_datum*)ipaddr)->nodes,
CIL_LIST_ITEM, addr_node);
arg->arg = (struct cil_symtab_datum*)ipaddr;
} else if (arg_node->data == NULL) {
cil_tree_log(call_node, CIL_ERR, "Invalid macro parameter");
cil_destroy_args(arg);
rc = SEPOL_ERR;
goto exit;
cil_list_append(DATUM(ipaddr)->nodes, CIL_LIST_ITEM, addr_node);
arg->arg = DATUM(ipaddr);
} else {
arg->arg_str = arg_node->data;
}
break;
}
case CIL_CLASS: