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154 lines · 3.4 KiB

1// SPDX-License-Identifier: GPL-2.0
2
3#include <stdio.h>
4#include <stdlib.h>
5#include <unistd.h>
6#include <string.h>
7#include <errno.h>
8#include <ctype.h>
9
10struct security_class_mapping {
11 const char *name;
12 const char *perms[sizeof(unsigned) * 8 + 1];
13};
14
15#include "classmap.h"
16#include "initial_sid_to_string.h"
17
18const char *progname;
19
20static void usage(void)
21{
22 printf("usage: %s flask.h av_permissions.h\n", progname);
23 exit(1);
24}
25
26static char *stoupperx(const char *s)
27{
28 char *s2 = strdup(s);
29 char *p;
30
31 if (!s2) {
32 fprintf(stderr, "%s: out of memory\n", progname);
33 exit(3);
34 }
35
36 for (p = s2; *p; p++)
37 *p = toupper(*p);
38 return s2;
39}
40
41int main(int argc, char *argv[])
42{
43 int i, j;
44 int isids_len;
45 FILE *fout;
46
47 progname = argv[0];
48
49 if (argc < 3)
50 usage();
51
52 fout = fopen(argv[1], "w");
53 if (!fout) {
54 fprintf(stderr, "Could not open %s for writing: %s\n",
55 argv[1], strerror(errno));
56 exit(2);
57 }
58
59 fprintf(fout, "/* This file is automatically generated. Do not edit. */\n");
60 fprintf(fout, "#ifndef _SELINUX_FLASK_H_\n#define _SELINUX_FLASK_H_\n\n");
61
62 for (i = 0; secclass_map[i].name; i++) {
63 char *name = stoupperx(secclass_map[i].name);
64
65 fprintf(fout, "#define SECCLASS_%-39s %2d\n", name, i+1);
66 free(name);
67 }
68
69 fprintf(fout, "\n");
70
71 isids_len = sizeof(initial_sid_to_string) / sizeof(char *);
72 for (i = 1; i < isids_len; i++) {
73 const char *s = initial_sid_to_string[i];
74 if (s) {
75 char *sidname = stoupperx(s);
76
77 fprintf(fout, "#define SECINITSID_%-39s %2d\n", sidname, i);
78 free(sidname);
79 }
80 }
81 fprintf(fout, "\n#define SECINITSID_NUM %d\n", i-1);
82 fprintf(fout, "\nstatic inline bool security_is_socket_class(u16 kern_tclass)\n");
83 fprintf(fout, "{\n");
84 fprintf(fout, "\tbool sock = false;\n\n");
85 fprintf(fout, "\tswitch (kern_tclass) {\n");
86 for (i = 0; secclass_map[i].name; i++) {
87 static char s[] = "SOCKET";
88 int len, l;
89 char *name = stoupperx(secclass_map[i].name);
90
91 len = strlen(name);
92 l = sizeof(s) - 1;
93 if (len >= l && memcmp(name + len - l, s, l) == 0)
94 fprintf(fout, "\tcase SECCLASS_%s:\n", name);
95 free(name);
96 }
97 fprintf(fout, "\t\tsock = true;\n");
98 fprintf(fout, "\t\tbreak;\n");
99 fprintf(fout, "\tdefault:\n");
100 fprintf(fout, "\t\tbreak;\n");
101 fprintf(fout, "\t}\n\n");
102 fprintf(fout, "\treturn sock;\n");
103 fprintf(fout, "}\n");
104
105 fprintf(fout, "\n#endif\n");
106
107 if (fclose(fout) != 0) {
108 fprintf(stderr, "Could not successfully close %s: %s\n",
109 argv[1], strerror(errno));
110 exit(4);
111 }
112
113 fout = fopen(argv[2], "w");
114 if (!fout) {
115 fprintf(stderr, "Could not open %s for writing: %s\n",
116 argv[2], strerror(errno));
117 exit(5);
118 }
119
120 fprintf(fout, "/* This file is automatically generated. Do not edit. */\n");
121 fprintf(fout, "#ifndef _SELINUX_AV_PERMISSIONS_H_\n#define _SELINUX_AV_PERMISSIONS_H_\n\n");
122
123 for (i = 0; secclass_map[i].name; i++) {
124 const struct security_class_mapping *map = &secclass_map[i];
125 int len;
126 char *name = stoupperx(map->name);
127
128 len = strlen(name);
129 for (j = 0; map->perms[j]; j++) {
130 char *permname;
131
132 if (j >= 32) {
133 fprintf(stderr, "Too many permissions to fit into an access vector at (%s, %s).\n",
134 map->name, map->perms[j]);
135 exit(5);
136 }
137 permname = stoupperx(map->perms[j]);
138 fprintf(fout, "#define %s__%-*s 0x%08xU\n", name,
139 39-len, permname, 1U<<j);
140 free(permname);
141 }
142 free(name);
143 }
144
145 fprintf(fout, "\n#endif\n");
146
147 if (fclose(fout) != 0) {
148 fprintf(stderr, "Could not successfully close %s: %s\n",
149 argv[2], strerror(errno));
150 exit(6);
151 }
152
153 exit(0);
154}