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