1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
|
#include "frida-gumjs.h"
#include "js.h"
#include "util.h"
gboolean js_done = FALSE;
js_api_stalker_callback_t js_user_callback = NULL;
js_main_hook_t js_main_hook = NULL;
static char * js_script = NULL;
static gchar * filename = "afl.js";
static gchar * contents;
static GumScriptBackend * backend;
static GCancellable * cancellable = NULL;
static GError * error = NULL;
static GumScript * script;
static GumScriptScheduler *scheduler;
static GMainContext * context;
static GMainLoop * main_loop;
static void js_msg(GumScript *script, const gchar *message, GBytes *data,
gpointer user_data) {
UNUSED_PARAMETER(script);
UNUSED_PARAMETER(data);
UNUSED_PARAMETER(user_data);
FOKF("%s", message);
}
void js_config(void) {
js_script = getenv("AFL_FRIDA_JS_SCRIPT");
}
static gchar *js_get_script() {
gsize length;
if (js_script != NULL) { filename = js_script; }
filename = g_canonicalize_filename(filename, g_get_current_dir());
if (!g_file_get_contents(filename, &contents, &length, NULL)) {
if (js_script == NULL) {
return NULL;
} else {
FFATAL("Could not load script file: %s", filename);
}
} else {
FOKF(cBLU "Javascript" cRST " - " cGRN "script:" cYEL " [%s]",
filename == NULL ? " " : filename);
FOKF(cBLU "Javascript" cRST " - " cGRN "size: " cYEL "%" G_GSIZE_MODIFIER
"d bytes",
length);
gchar *source = g_malloc0(api_js_len + length + 1);
memcpy(source, api_js, api_js_len);
memcpy(&source[api_js_len], contents, length);
return source;
}
}
static void js_print_script(gchar *source) {
gchar **split = g_strsplit(source, "\n", 0);
for (size_t i = 0; split[i] != NULL; i++) {
FVERBOSE("%3" G_GSIZE_MODIFIER "d. %s", i + 1, split[i]);
}
g_strfreev(split);
}
static void load_cb(GObject *source_object, GAsyncResult *result,
gpointer user_data) {
UNUSED_PARAMETER(source_object);
UNUSED_PARAMETER(user_data);
gum_script_load_finish(script, result);
if (error != NULL) { FFATAL("Failed to load script - %s", error->message); }
}
static void create_cb(GObject *source_object, GAsyncResult *result,
gpointer user_data) {
UNUSED_PARAMETER(source_object);
UNUSED_PARAMETER(user_data);
script = gum_script_backend_create_finish(backend, result, &error);
if (error != NULL) { FFATAL("Failed to create script: %s", error->message); }
gum_script_set_message_handler(script, js_msg, NULL, NULL);
gum_script_load(script, cancellable, load_cb, NULL);
}
void js_start(void) {
gchar *source = js_get_script();
if (source == NULL) { return; }
js_print_script(source);
scheduler = gum_script_backend_get_scheduler();
gum_script_scheduler_disable_background_thread(scheduler);
backend = gum_script_backend_obtain_qjs();
context = gum_script_scheduler_get_js_context(scheduler);
main_loop = g_main_loop_new(context, true);
g_main_context_push_thread_default(context);
gum_script_backend_create(backend, "example", source, cancellable, create_cb,
&error);
while (g_main_context_pending(context))
g_main_context_iteration(context, FALSE);
if (!js_done) { FFATAL("Script didn't call Afl.done()"); }
}
gboolean js_stalker_callback(const cs_insn *insn, gboolean begin,
gboolean excluded, GumStalkerOutput *output) {
if (js_user_callback == NULL) { return TRUE; }
return js_user_callback(insn, begin, excluded, output);
}
|
