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 	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