scripts/selinux/genheaders/genheaders.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 /* NOTE: we really do want to use the kernel headers here */
   4 #define __EXPORTED_HEADERS__
   5
   6 #include <stdio.h>
   7 #include <stdlib.h>
   8 #include <unistd.h>
   9 #include <string.h>
  10 #include <errno.h>
  11 #include <ctype.h>
  12 #include <sys/socket.h>
  13
  14 struct security_class_mapping {
  15         const char *name;
  16         const char *perms[sizeof(unsigned) * 8 + 1];
  17 };
  18
  19 #include "classmap.h"
  20 #include "initial_sid_to_string.h"
  21
  22 #define max(x, y) (((int)(x) > (int)(y)) ? x : y)
  23
  24 const char *progname;
  25
  26 static void usage(void)
  27 {
  28         printf("usage: %s flask.h av_permissions.h\n", progname);
  29         exit(1);
  30 }
  31
  32 static char *stoupperx(const char *s)
  33 {
  34         char *s2 = strdup(s);
  35         char *p;
  36
  37         if (!s2) {
  38                 fprintf(stderr, "%s:  out of memory\n", progname);
  39                 exit(3);
  40         }
  41
  42         for (p = s2; *p; p++)
  43                 *p = toupper(*p);
  44         return s2;
  45 }
  46
  47 int main(int argc, char *argv[])
  48 {
  49         int i, j, k;
  50         int isids_len;
  51         FILE *fout;
  52         const char *needle = "SOCKET";
  53         char *substr;
  54
  55         progname = argv[0];
  56
  57         if (argc < 3)
  58                 usage();
  59
  60         fout = fopen(argv[1], "w");
  61         if (!fout) {
  62                 fprintf(stderr, "Could not open %s for writing:  %s\n",
  63                         argv[1], strerror(errno));
  64                 exit(2);
  65         }
  66
  67         for (i = 0; secclass_map[i].name; i++) {
  68                 struct security_class_mapping *map = &secclass_map[i];
  69                 map->name = stoupperx(map->name);
  70                 for (j = 0; map->perms[j]; j++)
  71                         map->perms[j] = stoupperx(map->perms[j]);
  72         }
  73
  74         isids_len = sizeof(initial_sid_to_string) / sizeof (char *);
  75         for (i = 1; i < isids_len; i++)
  76                 initial_sid_to_string[i] = stoupperx(initial_sid_to_string[i]);
  77
  78         fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");
  79         fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n");
  80
  81         for (i = 0; secclass_map[i].name; i++) {
  82                 struct security_class_mapping *map = &secclass_map[i];
  83                 fprintf(fout, "#define SECCLASS_%s", map->name);
  84                 for (j = 0; j < max(1, 40 - strlen(map->name)); j++)
  85                         fprintf(fout, " ");
  86                 fprintf(fout, "%2d\n", i+1);
  87         }
  88
  89         fprintf(fout, "\n");
  90
  91         for (i = 1; i < isids_len; i++) {
  92                 const char *s = initial_sid_to_string[i];
  93                 fprintf(fout, "#define SECINITSID_%s", s);
  94                 for (j = 0; j < max(1, 40 - strlen(s)); j++)
  95                         fprintf(fout, " ");
  96                 fprintf(fout, "%2d\n", i);
  97         }
  98         fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
  99         fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
 100         fprintf(fout, "{\n");
 101         fprintf(fout, "\tbool sock = false;\n\n");
 102         fprintf(fout, "\tswitch (kern_tclass) {\n");
 103         for (i = 0; secclass_map[i].name; i++) {
 104                 struct security_class_mapping *map = &secclass_map[i];
 105                 substr = strstr(map->name, needle);
 106                 if (substr && strcmp(substr, needle) == 0)
 107                         fprintf(fout, "\tcase SECCLASS_%s:\n", map->name);
 108         }
 109         fprintf(fout, "\t\tsock = true;\n");
 110         fprintf(fout, "\t\tbreak;\n");
 111         fprintf(fout, "\tdefault:\n");
 112         fprintf(fout, "\t\tbreak;\n");
 113         fprintf(fout, "\t}\n\n");
 114         fprintf(fout, "\treturn sock;\n");
 115         fprintf(fout, "}\n");
 116
 117         fprintf(fout, "\n#endif\n");
 118         fclose(fout);
 119
 120         fout = fopen(argv[2], "w");
 121         if (!fout) {
 122                 fprintf(stderr, "Could not open %s for writing:  %s\n",
 123                         argv[2], strerror(errno));
 124                 exit(4);
 125         }
 126
 127         fprintf(fout, "/* This file is automatically generated.  Do not edit. */\n");
 128         fprintf(fout, "#ifndef _SELINUX_AV_PERMISSIONS_H_\n#define _SELINUX_AV_PERMISSIONS_H_\n\n");
 129
 130         for (i = 0; secclass_map[i].name; i++) {
 131                 struct security_class_mapping *map = &secclass_map[i];
 132                 for (j = 0; map->perms[j]; j++) {
 133                         if (j >= 32) {
 134                                 fprintf(stderr, "Too many permissions to fit into an access vector at (%s, %s).\n",
 135                                         map->name, map->perms[j]);
 136                                 exit(5);
 137                         }
 138                         fprintf(fout, "#define %s__%s", map->name,
 139                                 map->perms[j]);
 140                         for (k = 0; k < max(1, 40 - strlen(map->name) - strlen(map->perms[j])); k++)
 141                                 fprintf(fout, " ");
 142                         fprintf(fout, "0x%08xU\n", (1<<j));
 143                 }
 144         }
 145
 146         fprintf(fout, "\n#endif\n");
 147         fclose(fout);
 148         exit(0);
 149 }