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
usage(void)23 static void usage(void)
24 {
25 printf("usage: %s flask.h av_permissions.h\n", progname);
26 exit(1);
27 }
28
stoupperx(const char * s)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
main(int argc,char * argv[])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 fprintf(fout, "/* This file is automatically generated. Do not edit. */\n");
63 fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n");
64
65 for (i = 0; secclass_map[i].name; i++) {
66 char *name = stoupperx(secclass_map[i].name);
67
68 fprintf(fout, "#define SECCLASS_%-39s %2d\n", name, i+1);
69 free(name);
70 }
71
72 fprintf(fout, "\n");
73
74 isids_len = sizeof(initial_sid_to_string) / sizeof(char *);
75 for (i = 1; i < isids_len; i++) {
76 const char *s = initial_sid_to_string[i];
77 if (s) {
78 char *sidname = stoupperx(s);
79
80 fprintf(fout, "#define SECINITSID_%-39s %2d\n", sidname, i);
81 free(sidname);
82 }
83 }
84 fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
85 fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
86 fprintf(fout, "{\n");
87 fprintf(fout, "\tbool sock = false;\n\n");
88 fprintf(fout, "\tswitch (kern_tclass) {\n");
89 for (i = 0; secclass_map[i].name; i++) {
90 static char s[] = "SOCKET";
91 int len, l;
92 char *name = stoupperx(secclass_map[i].name);
93
94 len = strlen(name);
95 l = sizeof(s) - 1;
96 if (len >= l && memcmp(name + len - l, s, l) == 0)
97 fprintf(fout, "\tcase SECCLASS_%s:\n", name);
98 free(name);
99 }
100 fprintf(fout, "\t\tsock = true;\n");
101 fprintf(fout, "\t\tbreak;\n");
102 fprintf(fout, "\tdefault:\n");
103 fprintf(fout, "\t\tbreak;\n");
104 fprintf(fout, "\t}\n\n");
105 fprintf(fout, "\treturn sock;\n");
106 fprintf(fout, "}\n");
107
108 fprintf(fout, "\n#endif\n");
109
110 if (fclose(fout) != 0) {
111 fprintf(stderr, "Could not successfully close %s: %s\n",
112 argv[1], strerror(errno));
113 exit(4);
114 }
115
116 fout = fopen(argv[2], "w");
117 if (!fout) {
118 fprintf(stderr, "Could not open %s for writing: %s\n",
119 argv[2], strerror(errno));
120 exit(5);
121 }
122
123 fprintf(fout, "/* This file is automatically generated. Do not edit. */\n");
124 fprintf(fout, "#ifndef _SELINUX_AV_PERMISSIONS_H_\n#define _SELINUX_AV_PERMISSIONS_H_\n\n");
125
126 for (i = 0; secclass_map[i].name; i++) {
127 const struct security_class_mapping *map = &secclass_map[i];
128 int len;
129 char *name = stoupperx(map->name);
130
131 len = strlen(name);
132 for (j = 0; map->perms[j]; j++) {
133 char *permname;
134
135 if (j >= 32) {
136 fprintf(stderr, "Too many permissions to fit into an access vector at (%s, %s).\n",
137 map->name, map->perms[j]);
138 exit(5);
139 }
140 permname = stoupperx(map->perms[j]);
141 fprintf(fout, "#define %s__%-*s 0x%08xU\n", name,
142 39-len, permname, 1U<<j);
143 free(permname);
144 }
145 free(name);
146 }
147
148 fprintf(fout, "\n#endif\n");
149
150 if (fclose(fout) != 0) {
151 fprintf(stderr, "Could not successfully close %s: %s\n",
152 argv[2], strerror(errno));
153 exit(6);
154 }
155
156 exit(0);
157 }
158