sepolicy-analyze: Add attribute command.

Add an attribute command to sepolicy-analyze for displaying the list
of types associated with an attribute in a policy.  This is for use
by CTS to check what domains and types are associated with certain
attributes such as mlstrustedsubject and mlstrustedobject.

Change-Id: Ie19361c02feb1ad14ce36862c6aace9e66c422bb
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

tools/sepolicy-analyze/Android.mk

@@ -7,7 +7,7 @@ LOCAL_MODULE := sepolicy-analyze
 LOCAL_MODULE_TAGS := optional
 LOCAL_C_INCLUDES := external/libsepol/include
 LOCAL_CFLAGS := -Wall -Werror
-LOCAL_SRC_FILES := sepolicy-analyze.c dups.c neverallow.c perm.c typecmp.c booleans.c utils.c
+LOCAL_SRC_FILES := sepolicy-analyze.c dups.c neverallow.c perm.c typecmp.c booleans.c attribute.c utils.c
 LOCAL_STATIC_LIBRARIES := libsepol
 
 include $(BUILD_HOST_EXECUTABLE)

tools/sepolicy-analyze/README

@@ -60,6 +60,11 @@ sepolicy-analyze
     Policy booleans are forbidden in Android policy, so if there is any
     output, the policy will fail CTS.
 
+    ATTRIBUTE (attribute)
+    sepolicy-analyze out/target/product/<board>/root/sepolicy attribute <name>
+
+    Displays the types associated with the specified attribute name.
+
     NEVERALLOW CHECKING (neverallow)
     sepolicy-analyze out/target/product/<board>/root/sepolicy neverallow \
     [-w] [-d] [-f neverallows.conf] | [-n "neverallow string"]

tools/sepolicy-analyze/attribute.c

+#include "attribute.h"
+
+void attribute_usage() {
+    fprintf(stderr, "\tattribute <attribute-name>\n");
+}
+
+static int list_attribute(policydb_t * policydb, char *name)
+{
+    struct type_datum *attr;
+    struct ebitmap_node *n;
+    unsigned int bit;
+
+    attr = hashtab_search(policydb->p_types.table, name);
+    if (!attr) {
+        fprintf(stderr, "%s is not defined in this policy.\n", name);
+        return -1;
+    }
+
+    if (attr->flavor != TYPE_ATTRIB) {
+        fprintf(stderr, "%s is a type not an attribute in this policy.\n", name);
+        return -1;
+    }
+
+    ebitmap_for_each_bit(&policydb->attr_type_map[attr->s.value - 1], n, bit) {
+        if (!ebitmap_node_get_bit(n, bit))
+            continue;
+        printf("%s\n", policydb->p_type_val_to_name[bit]);
+    }
+
+    return 0;
+}
+
+int attribute_func (int argc, char **argv, policydb_t *policydb) {
+    if (argc != 2) {
+        USAGE_ERROR = true;
+        return -1;
+    }
+    return list_attribute(policydb, argv[1]);
+}

tools/sepolicy-analyze/attribute.h

+#ifndef ATTRIBUTE_H
+#define ATTRIBUTE_H
+
+#include <sepol/policydb/policydb.h>
+
+#include "utils.h"
+
+void attribute_usage(void);
+int attribute_func(int argc, char **argv, policydb_t *policydb);
+
+#endif /* ATTRIBUTE_H */

tools/sepolicy-analyze/sepolicy-analyze.c

@@ -7,6 +7,7 @@
 #include "perm.h"
 #include "typecmp.h"
 #include "booleans.h"
+#include "attribute.h"
 #include "utils.h"
 
 #define NUM_COMPONENTS (int) (sizeof(analyze_components)/sizeof(analyze_components[0]))
@@ -22,7 +23,8 @@ static struct {
     COMP(neverallow),
     COMP(permissive),
     COMP(typecmp),
-    COMP(booleans)
+    COMP(booleans),
+    COMP(attribute)
 };
 
 void usage(char *arg0)