scripts/selinux/mdp/mdp.c

Source file repositories/reference/linux-study-clean/scripts/selinux/mdp/mdp.c

File Facts

System
Linux kernel
Corpus path
scripts/selinux/mdp/mdp.c
Extension
.c
Size
6667 bytes
Lines
267
Domain
Support Tooling And Documentation
Bucket
scripts
Inferred role
Support Tooling And Documentation: implementation source
Status
source implementation candidate

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

struct security_class_mapping {
	const char *name;
	const char *perms[sizeof(unsigned) * 8 + 1];
};

#include "classmap.h"
#include "initial_sid_to_string.h"
#include "policycap_names.h"

#define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

int main(int argc, char *argv[])
{
	int i, j, mls = 0;
	int initial_sid_to_string_len;
	char **arg, *polout, *ctxout;

	FILE *fout;

	if (argc < 3)
		usage(argv[0]);
	arg = argv+1;
	if (argc==4 && strcmp(argv[1], "-m") == 0) {
		mls = 1;
		arg++;
	}
	polout = *arg++;
	ctxout = *arg;

	fout = fopen(polout, "w");
	if (!fout) {
		printf("Could not open %s for writing\n", polout);
		usage(argv[0]);
	}

	/* print out the classes */
	for (i = 0; secclass_map[i].name; i++)
		fprintf(fout, "class %s\n", secclass_map[i].name);
	fprintf(fout, "\n");

	initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
	/* print out the sids */
	for (i = 1; i < initial_sid_to_string_len; i++) {
		const char *name = initial_sid_to_string[i];

		if (name)
			fprintf(fout, "sid %s\n", name);
		else
			fprintf(fout, "sid unused%d\n", i);
	}
	fprintf(fout, "\n");

	/* print out the class permissions */
	for (i = 0; secclass_map[i].name; i++) {
		const struct security_class_mapping *map = &secclass_map[i];
		fprintf(fout, "class %s\n", map->name);
		fprintf(fout, "{\n");
		for (j = 0; map->perms[j]; j++)
			fprintf(fout, "\t%s\n", map->perms[j]);
		fprintf(fout, "}\n\n");
	}
	fprintf(fout, "\n");

	/* print out mls declarations and constraints */
	if (mls) {
		fprintf(fout, "sensitivity s0;\n");
		fprintf(fout, "sensitivity s1;\n");
		fprintf(fout, "dominance { s0 s1 }\n");
		fprintf(fout, "category c0;\n");
		fprintf(fout, "category c1;\n");
		fprintf(fout, "level s0:c0.c1;\n");
		fprintf(fout, "level s1:c0.c1;\n");
#define SYSTEMLOW "s0"
#define SYSTEMHIGH "s1:c0.c1"
		for (i = 0; secclass_map[i].name; i++) {
			const struct security_class_mapping *map = &secclass_map[i];

			fprintf(fout, "mlsconstrain %s {\n", map->name);
			for (j = 0; map->perms[j]; j++)
				fprintf(fout, "\t%s\n", map->perms[j]);
			/*
			 * This requires all subjects and objects to be
			 * single-level (l2 eq h2), and that the subject
			 * level dominate the object level (h1 dom h2)
			 * in order to have any permissions to it.
			 */
			fprintf(fout, "} (l2 eq h2 and h1 dom h2);\n\n");
		}
	}

Annotation

Implementation Notes