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Commit 8753f6be authored by Stephen Smalley's avatar Stephen Smalley Committed by James Morris
Browse files

selinux: generate flask headers during kernel build 



Add a simple utility (scripts/selinux/genheaders) and invoke it to
generate the kernel-private class and permission indices in flask.h
and av_permissions.h automatically during the kernel build from the
security class mapping definitions in classmap.h.  Adding new kernel
classes and permissions can then be done just by adding them to classmap.h.

Signed-off-by: default avatarStephen Smalley <sds@tycho.nsa.gov>
Signed-off-by: default avatarJames Morris <jmorris@namei.org>
parent c6d3aaa4

scripts/selinux/Makefile

+2 −2
Original line number Diff line number Diff line 
subdir-y := mdp

subdir-	+= mdp
 
subdir-y := mdp genheaders

subdir-	+= mdp genheaders

scripts/selinux/genheaders/Makefile

0 → 100644
+5 −0
Original line number Diff line number Diff line 
hostprogs-y	:= genheaders

HOST_EXTRACFLAGS += -Isecurity/selinux/include



always		:= $(hostprogs-y)

clean-files	:= $(hostprogs-y)

scripts/selinux/genheaders/genheaders.c

0 → 100644
+118 −0
Original line number Diff line number Diff line 
#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <string.h>

#include <errno.h>

#include <ctype.h>



struct security_class_mapping {

	const char *name;

	const char *perms[sizeof(unsigned) * 8 + 1];

};



#include "classmap.h"

#include "initial_sid_to_string.h"



#define max(x, y) ((x > y) ? x : y)



const char *progname;



void usage(void)

{

	printf("usage: %s flask.h av_permissions.h\n", progname);

	exit(1);

}



char *stoupperx(const char *s)

{

	char *s2 = strdup(s);

	char *p;



	if (!s2) {

		fprintf(stderr, "%s:  out of memory\n", progname);

		exit(3);

	}



	for (p = s2; *p; p++)

		*p = toupper(*p);

	return s2;

}



int main(int argc, char *argv[])

{

	int i, j, k;

	int isids_len;

	FILE *fout;



	progname = argv[0];



	if (argc < 3)

		usage();



	fout = fopen(argv[1], "w");

	if (!fout) {

		fprintf(stderr, "Could not open %s for writing:  %s\n",

			argv[1], strerror(errno));

		exit(2);

	}



	for (i = 0; secclass_map[i].name; i++) {

		struct security_class_mapping *map = &secclass_map[i];

		map->name = stoupperx(map->name);

		for (j = 0; map->perms[j]; j++)

			map->perms[j] = stoupperx(map->perms[j]);

	}



	isids_len = sizeof(initial_sid_to_string) / sizeof (char *);

	for (i = 1; i < isids_len; i++)

		initial_sid_to_string[i] = stoupperx(initial_sid_to_string[i]);



	fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");

	fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n");



	for (i = 0; secclass_map[i].name; i++) {

		struct security_class_mapping *map = &secclass_map[i];

		fprintf(fout, "#define SECCLASS_%s", map->name);

		for (j = 0; j < max(1, 40 - strlen(map->name)); j++)

			fprintf(fout, " ");

		fprintf(fout, "%2d\n", i+1);

	}



	fprintf(fout, "\n");



	for (i = 1; i < isids_len; i++) {

		char *s = initial_sid_to_string[i];

		fprintf(fout, "#define SECINITSID_%s", s);

		for (j = 0; j < max(1, 40 - strlen(s)); j++)

			fprintf(fout, " ");

		fprintf(fout, "%2d\n", i);

	}

	fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);

	fprintf(fout, "\n#endif\n");

	fclose(fout);



	fout = fopen(argv[2], "w");

	if (!fout) {

		fprintf(stderr, "Could not open %s for writing:  %s\n",

			argv[2], strerror(errno));

		exit(4);

	}



	fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");

	fprintf(fout, "#ifndef _SELINUX_AV_PERMISSIONS_H_\n#define _SELINUX_AV_PERMISSIONS_H_\n\n");



	for (i = 0; secclass_map[i].name; i++) {

		struct security_class_mapping *map = &secclass_map[i];

		for (j = 0; map->perms[j]; j++) {

			fprintf(fout, "#define %s__%s", map->name,

				map->perms[j]);

			for (k = 0; k < max(1, 40 - strlen(map->name) - strlen(map->perms[j])); k++)

				fprintf(fout, " ");

			fprintf(fout, "0x%08xUL\n", (1<<j));

		}

	}



	fprintf(fout, "\n#endif\n");

	fclose(fout);

	exit(0);

}

security/selinux/Makefile

+9 −1
Original line number Diff line number Diff line
@@ -18,5 +18,13 @@ selinux-$(CONFIG_SECURITY_NETWORK_XFRM) += xfrm.o 


selinux-$(CONFIG_NETLABEL) += netlabel.o



EXTRA_CFLAGS += -Isecurity/selinux/include

EXTRA_CFLAGS += -Isecurity/selinux -Isecurity/selinux/include



$(obj)/avc.o: $(obj)/flask.h



quiet_cmd_flask = GEN     $(obj)/flask.h $(obj)/av_permissions.h

      cmd_flask = scripts/selinux/genheaders/genheaders $(obj)/flask.h $(obj)/av_permissions.h



targets += flask.h

$(obj)/flask.h: $(src)/include/classmap.h FORCE

	$(call if_changed,flask)