scripts/selinux/genheaders/genheaders.c

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