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511dc44a » Laurent Sansonetti
2008-02-25 initial import
1 /* -*-c-*- */
2 /*
3 * This file is included by eval.c
4 */
5
6 /* safe-level:
7 0 - strings from streams/environment/ARGV are tainted (default)
8 1 - no dangerous operation by tainted value
9 2 - process/file operations prohibited
10 3 - all generated objects are tainted
11 4 - no global (non-tainted) variable modification/no direct output
12 */
13
14 #define SAFE_LEVEL_MAX 4
15
16 /* $SAFE accessor */
17
18 int
19 rb_safe_level(void)
20 {
21 return GET_THREAD()->safe_level;
22 }
23
24 void
25 rb_set_safe_level_force(int safe)
26 {
27 GET_THREAD()->safe_level = safe;
28 }
29
30 void
31 rb_set_safe_level(int level)
32 {
33 rb_thread_t *th = GET_THREAD();
34
35 if (level > th->safe_level) {
36 if (level > SAFE_LEVEL_MAX) {
37 level = SAFE_LEVEL_MAX;
38 }
39 th->safe_level = level;
40 }
41 }
42
43 static VALUE
44 safe_getter(void)
45 {
46 return INT2NUM(rb_safe_level());
47 }
48
49 static void
50 safe_setter(VALUE val)
51 {
52 int level = NUM2INT(val);
53 rb_thread_t *th = GET_THREAD();
54
55 if (level < th->safe_level) {
56 rb_raise(rb_eSecurityError,
57 "tried to downgrade safe level from %d to %d",
58 th->safe_level, level);
59 }
60 if (level > SAFE_LEVEL_MAX) {
61 level = SAFE_LEVEL_MAX;
62 }
63 th->safe_level = level;
64 }
65
66 void
67 rb_secure(int level)
68 {
69 if (level <= rb_safe_level()) {
70 if (rb_frame_callee()) {
71 rb_raise(rb_eSecurityError, "Insecure operation `%s' at level %d",
72 rb_id2name(rb_frame_callee()), rb_safe_level());
73 }
74 else {
75 rb_raise(rb_eSecurityError, "Insecure operation at level %d",
76 rb_safe_level());
77 }
78 }
79 }
80
81 void
82 rb_secure_update(VALUE obj)
83 {
84 if (!OBJ_TAINTED(obj))
85 rb_secure(4);
86 }
87
88 void
89 rb_check_safe_obj(VALUE x)
90 {
91 if (rb_safe_level() > 0 && OBJ_TAINTED(x)) {
92 if (rb_frame_callee()) {
93 rb_raise(rb_eSecurityError, "Insecure operation - %s",
94 rb_id2name(rb_frame_callee()));
95 }
96 else {
97 rb_raise(rb_eSecurityError, "Insecure operation: -r");
98 }
99 }
100 rb_secure(4);
101 }
102
103 void
104 rb_check_safe_str(VALUE x)
105 {
106 rb_check_safe_obj(x);
107 if (TYPE(x) != T_STRING) {
108 rb_raise(rb_eTypeError, "wrong argument type %s (expected String)",
109 rb_obj_classname(x));
110 }
111 }
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