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ngx_http_robot_mitigation.c
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ngx_http_robot_mitigation.c
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/*
* Copyright (c) 2013 Neusoft Corperation., Ltd.
*/
#include <ngx_http_robot_mitigation.h>
#if (NGX_HTTP_NETEYE_SECURITY)
#include <ngx_http_neteye_security.h>
#endif
#include <ngx_sha1.h>
#include <ngx_resolver.h>
#include <zlib.h>
extern const ngx_http_rm_tpl_t ngx_http_rm_get_js_tpls[];
extern const ngx_uint_t ngx_http_rm_get_js_tpls_nr;
extern const ngx_http_rm_tpl_t ngx_http_rm_post_js_tpls[];
extern const ngx_uint_t ngx_http_rm_post_js_tpls_nr;
static ngx_rbtree_t ngx_http_rm_dns_rbtree;
static ngx_rbtree_node_t ngx_http_rm_dns_sentinel;
static ngx_log_t ngx_http_rm_timer_log;
static ngx_conf_deprecated_t ngx_conf_deprecated_rm_whitelist = {
ngx_conf_deprecated, "robot_mitigation_whitelist",
"robot_mitigation_global_whitelist"
};
static ngx_conf_deprecated_t ngx_conf_deprecated_rm_ip_whitelist = {
ngx_conf_deprecated, "robot_mitigation_ip_whitelist",
"robot_mitigation_global_whitelist"
};
#define NGX_HTTP_RM_GET_SWF \
"<html>\n<body>\n" \
"<OBJECT classid=\"clsid:D27CDB6E-AE6D-11cf-96B8-444553540000\"" \
"codebase=\"http://download.macromedia.com/pub/shockwave/" \
"cabs/flash/swflash.cab#version=6,0,40,0\"" \
" WIDTH=\"100\" HEIGHT=\"100\" " \
"id=\"%s\">" \
"<PARAM NAME=movie VALUE=\"%s.swf\">" \
"<PARAM NAME=quality VALUE=high><PARAM NAME=bgcolor VALUE=#FFFFFF>" \
"<EMBED src=\"/%s.swf\" " \
"quality=high bgcolor=#FFFFFF WIDTH=\"100\" HEIGHT=\"100\" " \
"NAME=\"%s\" " \
"ALIGN=\"\" TYPE=\"application/x-shockwave-flash\" " \
"PLUGINSPAGE=\"http://www.macromedia.com/go/getflashplayer\">" \
"</EMBED></OBJECT>\n</body>\n</html>\n"
#define NGX_HTTP_RM_POST_JS_2 \
"</form>\n</body>\n</html>\n"
#define NGX_HTTP_RM_POST_JS_2_LEN 24
#define NGX_HTTP_RM_POST_SWF_1 \
"<html>\n<body>\n" \
"<OBJECT classid=\"clsid:D27CDB6E-AE6D-11cf-96B8-444553540000\"" \
"codebase=\"http://download.macromedia.com/pub/shockwave/" \
"cabs/flash/swflash.cab#version=6,0,40,0\"" \
" WIDTH=\"100\" HEIGHT=\"100\" " \
"id=\"%s\">" \
"<PARAM NAME=movie VALUE=\"%s.swf\">" \
"<PARAM NAME=quality VALUE=high><PARAM NAME=bgcolor VALUE=#FFFFFF>" \
"<EMBED src=\"/%s.swf\" " \
"quality=high bgcolor=#FFFFFF WIDTH=\"100\" HEIGHT=\"100\" " \
"NAME=\"%s\" " \
"ALIGN=\"\" TYPE=\"application/x-shockwave-flash\" " \
"PLUGINSPAGE=\"http://www.macromedia.com/go/getflashplayer\">" \
"</EMBED></OBJECT>\n" \
"<form name=\"response\" method=\"post\">\n"
#define NGX_HTTP_RM_POST_SWF_2 \
"</form>\n" \
"</body>\n</html>\n"
static const char ngx_http_rm_get_swf[] = 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static ngx_str_t
ngx_http_rm_type_swf = ngx_string("application/x-shockwave-flash");
static ngx_str_t ngx_http_rm_type_html = ngx_string("text/html");
static ngx_int_t
ngx_http_rm_add_variables(ngx_conf_t *cf);
static ngx_int_t
ngx_http_rm_blacklist_variable(ngx_http_request_t *r,
ngx_http_variable_value_t *v, uintptr_t data);
static char *
ngx_http_rm_cookie_name(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *
ngx_http_rm_timeout(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t
ngx_http_rm_content_handler(ngx_http_request_t *r);
static ngx_int_t
ngx_http_rm_request_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_rm_init(ngx_conf_t *cf);
static void *ngx_http_rm_create_loc_conf(ngx_conf_t *cf);
static char *
ngx_http_rm_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child);
static ngx_int_t
ngx_http_rm_challenge_get_js_handler(ngx_http_request_t *r);
static ngx_int_t
ngx_http_rm_challenge_get_swf_handler(ngx_http_request_t *r);
ngx_int_t ngx_http_rm_special_swf_uri(ngx_http_request_t *r);
static ngx_int_t
ngx_http_rm_send_swf_file_handler(ngx_http_request_t *r, ngx_uint_t method);
static ngx_int_t
ngx_http_rm_send_swf_handler(ngx_http_request_t *r);
static ngx_int_t
ngx_http_rm_send_response(ngx_http_request_t *r, ngx_uint_t status,
ngx_str_t *ct, ngx_str_t val);
static ngx_int_t
ngx_http_rm_challenge_post_js_handler(ngx_http_request_t *r);
static ngx_int_t
ngx_http_rm_challenge_post_swf_handler(ngx_http_request_t *r);
static u_char *
ngx_http_rm_post_body_to_form(ngx_http_request_t *r,
u_char *body, ngx_uint_t len,
ngx_uint_t *post_args_len);
static u_char *
ngx_http_rm_post_data_decode(ngx_http_request_t *r,
u_char *string, ngx_uint_t len,
ngx_uint_t *decoded_len);
static ngx_http_rm_dns_t *
ngx_http_rm_dns_lookup(ngx_rbtree_t *tree, ngx_str_t *addr, uint32_t hash);
static void *
ngx_http_rm_create_main_conf(ngx_conf_t *cf);
static ngx_int_t
ngx_http_rm_request_ctx_init(ngx_http_request_t *r);
static ngx_http_rm_req_ctx_t *
ngx_http_rm_get_request_ctx(ngx_http_request_t *r);
static char *
ngx_http_rm_whitelist(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *
ngx_http_rm_ip_whitelist(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char *
ngx_http_rm_resolver(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_int_t
ngx_http_rm_test_content_type(ngx_http_request_t *r, u_char *type);
static char *
ngx_http_rm_global_whitelist(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static ngx_conf_enum_t ngx_http_rm_mode[] = {
{ ngx_string("js"), NGX_HTTP_RM_MODE_JS },
{ ngx_string("JS"), NGX_HTTP_RM_MODE_JS },
{ ngx_string("swf"), NGX_HTTP_RM_MODE_SWF },
{ ngx_string("SWF"), NGX_HTTP_RM_MODE_SWF },
{ ngx_null_string, 0 }
};
static ngx_command_t ngx_http_robot_mitigation_commands[] = {
{ ngx_string("robot_mitigation"),
NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, enabled),
NULL },
{ ngx_string("robot_mitigation_cookie_name"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_http_rm_cookie_name,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("robot_mitigation_mode"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_enum_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, mode),
&ngx_http_rm_mode },
{ ngx_string("robot_mitigation_blacklist"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, failed_count),
NULL },
{ ngx_string("robot_mitigation_timeout"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE1,
ngx_http_rm_timeout,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("robot_mitigation_whitelist_caseless"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, wl_caseless),
NULL },
{ ngx_string("robot_mitigation_resolver"),
NGX_HTTP_MAIN_CONF|NGX_CONF_1MORE,
ngx_http_rm_resolver,
NGX_HTTP_MAIN_CONF_OFFSET,
0,
NULL },
{ ngx_string("robot_mitigation_resolver_timeout"),
NGX_HTTP_MAIN_CONF|NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_rm_main_conf_t, resolver_timeout),
NULL },
{ ngx_string("robot_mitigation_whitelist"),
NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
ngx_http_rm_whitelist,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("robot_mitigation_ip_whitelist"),
NGX_HTTP_LOC_CONF|NGX_CONF_BLOCK|NGX_CONF_NOARGS,
ngx_http_rm_ip_whitelist,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
#if (NGX_HTTP_X_FORWARDED_FOR)
{ ngx_string("robot_mitigation_ip_whitelist_x_forwarded_for"),
NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, ip_whitelist_x_forwarded_for),
NULL },
#endif
{ ngx_string("robot_mitigation_challenge_ajax"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_FLAG,
ngx_conf_set_flag_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, pass_ajax),
NULL },
{ ngx_string("robot_mitigation_global_whitelist"),
NGX_HTTP_LOC_CONF|NGX_HTTP_LIF_CONF|NGX_CONF_TAKE123,
ngx_http_rm_global_whitelist,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL },
{ ngx_string("robot_mitigation_secret"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, secret),
NULL },
{ ngx_string("robot_mitigation_hash_input"),
NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
ngx_conf_set_str_slot,
NGX_HTTP_LOC_CONF_OFFSET,
offsetof(ngx_http_rm_loc_conf_t, hash_input),
NULL },
ngx_null_command
};
static ngx_http_variable_t ngx_http_rm_vars[] = {
{ ngx_string("robot_mitigation_blacklist"),
NULL, ngx_http_rm_blacklist_variable, 0,
NGX_HTTP_VAR_CHANGEABLE|NGX_HTTP_VAR_NOCACHEABLE|NGX_HTTP_VAR_NOHASH, 0 },
{ ngx_null_string, NULL, NULL, 0, 0, 0 }
};
static ngx_http_module_t
ngx_http_robot_mitigation_module_ctx = {
ngx_http_rm_add_variables, /* preconfiguration */
ngx_http_rm_init, /* postconfiguration */
ngx_http_rm_create_main_conf, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_rm_create_loc_conf, /* create location configuration */
ngx_http_rm_merge_loc_conf, /* merge location configuration */
};
ngx_module_t ngx_http_robot_mitigation_module = {
NGX_MODULE_V1, /* module context */
&ngx_http_robot_mitigation_module_ctx, /* module directives */
ngx_http_robot_mitigation_commands, /* module type */
NGX_HTTP_MODULE, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NULL,
NGX_MODULE_V1_PADDING
};
static u_char
ngx_http_rm_ascii_to_hex(u_char a)
{
if (a >= '0' && a <= '9') {
a = a - 48;
} else if (a >= 'a' && a <= 'f') {
a = a - 87;
} else if (a >= 'A' && a <= 'F') {
a = a - 55;
} else {
a = 0;
}
return a;
}
static u_char
ngx_http_rm_change_to_hex(u_char a, u_char b)
{
u_char sum;
a = ngx_http_rm_ascii_to_hex(a);
b = ngx_http_rm_ascii_to_hex(b);
sum = a * 16 + b;
return sum;
}
/**
* decode the post body
*
* $data =~ tr/+/ /;
* $data =~ s/%([a-fA-F0-9]{2})/pack("C", hex($1))/eg;
* $data =~ s/\x22/"/g;
*/
typedef struct {
ngx_uint_t offset;
/* type 1: +
* type 2: %HH
* type 3: \x22
* */
ngx_uint_t type;
ngx_uint_t delta;
u_char hex;
} ngx_http_rm_decode_helper_t;
static ngx_int_t
ngx_http_rm_is_ascii_hex(u_char a)
{
if ((a <= '9' && a >= '0')
|| (a <= 'F' && a >= 'A')
|| (a <= 'f' && a >= 'a')) {
return 1;
}
return 0;
}
static u_char *
ngx_http_rm_post_data_decode(ngx_http_request_t *r,
u_char *string, ngx_uint_t len,
ngx_uint_t *decoded_len)
{
u_char *decoded;
ngx_http_rm_decode_helper_t *helper;
ngx_uint_t nr_helper = 0;
ngx_uint_t pos = 0, src_pos = 0;
ngx_uint_t i, new_len = 0, nr_b = 0, nr_c = 0;
ngx_uint_t last_sub, delta;
helper = ngx_pcalloc(r->pool, sizeof(ngx_http_rm_decode_helper_t) * len);
if (helper == NULL) {
return NULL;
}
for (i = 0; i < len; i++) {
if (string[i] == '+') {
/* find a + */
helper[nr_helper].offset = i;
helper[nr_helper].type = 1;
helper[nr_helper].delta = 1;
nr_helper++;
}
if (string[i] == '%') {
if (i + 2 < len) {
if (ngx_http_rm_is_ascii_hex(string[i + 1])
&& ngx_http_rm_is_ascii_hex(string[i + 2])) {
/* find a %HH */
helper[nr_helper].offset = i;
helper[nr_helper].type = 2;
helper[nr_helper].hex =
ngx_http_rm_change_to_hex(string[i + 1],
string[i + 2]);
helper[nr_helper].delta = 3;
nr_helper++;
nr_b++;
}
}
}
if (string[i] == '\x22') {
helper[nr_helper].offset = i;
helper[nr_helper].type = 3;
helper[nr_helper].delta = 1;
nr_helper++;
nr_c++;
}
}
if (nr_helper == 0) {
/* nothing to be substituted */
*decoded_len = len;
return string;
} else {
/* -2 means %HH to a char */
/* 5 means \x22 to " */
new_len = len + (-2) * nr_b + 5 * nr_c;
decoded = ngx_pcalloc(r->pool, new_len);
if (decoded == NULL) {
return NULL;
}
pos = 0;
for (i = 0; i < nr_helper; i++) {
if (i != 0) {
src_pos = helper[i - 1].offset + helper[i - 1].delta;
ngx_memcpy(decoded + pos,
string + src_pos,
helper[i].offset - src_pos);
pos += (helper[i].offset - src_pos);
} else {
if (helper[i].offset != 0) {
ngx_memcpy(decoded, string, helper[i].offset);
pos += helper[i].offset;
}
}
switch (helper[i].type) {
case 1:
/* sub + to ' ' */
decoded[pos] = ' ';
pos++;
break;
case 2:
decoded[pos] = helper[i].hex;
pos++;
break;
case 3:
ngx_memcpy(decoded + pos,
""",
strlen("""));
pos += strlen(""");
break;
}
}
last_sub = helper[nr_helper - 1].offset;
delta = helper[nr_helper - 1].delta;
if (last_sub + delta != len) {
/* copy the remaining chars into decoded */
ngx_memcpy(decoded + pos,
string + last_sub + delta,
len - (last_sub + delta)
);
}
}
*decoded_len = new_len;
#if 0
ngx_uint_t k;
for (k = 0; k < *decoded_len; k++) {
fprintf(stderr, "%c", decoded[k]);
}
fprintf(stderr, "\n");
#endif
return decoded;
}
/* obtaine request body and recover POST data */
static u_char *
ngx_http_rm_post_body_to_form(ngx_http_request_t *r,
u_char *body, ngx_uint_t body_len,
ngx_uint_t *post_vars_len)
{
u_char *post_vars = NULL;
ngx_uint_t i, j, start, found = 0;
u_char *variable, *varname = NULL, *varvalue = NULL;
u_char *varname_e, *varvalue_e;
ngx_uint_t varname_len = 0, varvalue_len = 0;
u_char *decoded_name, *decoded_value;
ngx_uint_t decoded_name_len, decoded_value_len;
ngx_uint_t form_len = 0, inc_form_len = 0, offset;
u_char *buf_a, *buf_b;
start = 0;
*post_vars_len = 0;
for (i = 0; i < body_len; i++) {
if (body[i] == '&') {
/* find a varname=varvalue pattern */
variable = body + start;
for (j = start; j < i; j++) {
if (body[j] == '=') {
/* find a = */
varname = variable;
varname_e = body + j;
varname_len = varname_e - varname;
if (j == i - 1) {
/* null value for this variable */
varvalue = varvalue_e = NULL;
varvalue_len = 0;
} else {
varvalue = body + j + 1;
varvalue_e = body + i;
varvalue_len = varvalue_e - varvalue;
}
found = 1;
}
}
start = i + 1;
}
/* only once, the last variable */
if (i == body_len - 1) {
/* find the last varname=varvalue pattern */
variable = body + start;
for (j = start; j <= i; j++) {
if (body[j] == '=') {
/* find a = */
varname = variable;
varname_e = body + j;
varname_len = varname_e - varname;
if (j == i) {
varvalue = varvalue_e = NULL;
varvalue_len = 0;
} else {
varvalue = body + j + 1;
varvalue_e = body + i + 1;
varvalue_len = varvalue_e - varvalue;
}
found = 1;
}
}
}
if (found == 1) {
found = 0;
decoded_name = ngx_http_rm_post_data_decode(r,
varname, varname_len, &decoded_name_len);
if (decoded_name == NULL) {
return NULL;
}
if (varvalue_len != 0) {
decoded_value = ngx_http_rm_post_data_decode(r,
varvalue, varvalue_len, &decoded_value_len);
if (decoded_value == NULL) {
return NULL;
}
} else {
decoded_value = NULL;
decoded_value_len = 0;
}
inc_form_len = strlen(NGX_HTTP_RM_FORM_VARIABLES_1)
+ strlen(NGX_HTTP_RM_FORM_VARIABLES_2)
+ strlen(NGX_HTTP_RM_FORM_VARIABLES_3)
+ decoded_name_len
+ decoded_value_len;
buf_a = ngx_pcalloc(r->pool, form_len + inc_form_len);
if (buf_a == NULL) {
return NULL;
}
/* points buf_b to post_vars */
buf_b = post_vars;
/* copy post_vars to buf_a and add new stuffs */
if (post_vars != NULL) {
/* copy old stuffs here */
memcpy(buf_a, post_vars, form_len);
}
/* initial offset */
offset = form_len;
/* copy part 1 */
ngx_memcpy(buf_a + offset,
NGX_HTTP_RM_FORM_VARIABLES_1,
strlen(NGX_HTTP_RM_FORM_VARIABLES_1));
offset += strlen(NGX_HTTP_RM_FORM_VARIABLES_1);
/* copy vairiable name */
ngx_memcpy(buf_a + offset,
decoded_name,
decoded_name_len);
offset += decoded_name_len;
/* copy part 2 */
ngx_memcpy(buf_a + offset,
NGX_HTTP_RM_FORM_VARIABLES_2,
strlen(NGX_HTTP_RM_FORM_VARIABLES_2));
offset += strlen(NGX_HTTP_RM_FORM_VARIABLES_2);
/* copy variable value if not 0 */
if (decoded_value_len != 0) {
ngx_memcpy(buf_a + offset,
decoded_value,
decoded_value_len);
offset += decoded_value_len;
}
/* copy part 3 */
ngx_memcpy(buf_a + offset,
NGX_HTTP_RM_FORM_VARIABLES_3,
strlen(NGX_HTTP_RM_FORM_VARIABLES_3));
/* points post_vars to buf_a and free buf_b */
post_vars = buf_a;
ngx_pfree(r->pool, buf_b);
form_len += inc_form_len;
}
}
*post_vars_len = form_len;
#if 0
ngx_uint_t k;
for (k = 0; k < *post_vars_len; k++) {
fprintf(stderr, "%c", post_vars[k]);
}
fprintf(stderr, "\n");
#endif
return post_vars;
}
static ngx_int_t
ngx_http_rm_generate_fake_cookie(ngx_http_request_t *r,
ngx_str_t *fake_1, ngx_str_t *fake_2)
{
ngx_sha1_t sha1_state;
u_char sha1_digest[20];
u_char hex_output[20 * 2 + 1], source[512];
ngx_uint_t di, source_len = 0;
ngx_int_t t;
ngx_int_t ra;
t = ngx_time();
ra = ngx_random();
/* generate fake cookies */
if (fake_1 != NULL) {
memset(source, 0, 512);
source_len = snprintf((char *)source, 512, "%d", (int)(ra + t));
ngx_sha1_init(&sha1_state);
ngx_sha1_update(&sha1_state, source, source_len);
ngx_sha1_final(sha1_digest, &sha1_state);
for (di = 0; di < 20; di++) {
sprintf((char *)hex_output + di * 2, "%02x", sha1_digest[di]);
}
memcpy(fake_1->data, hex_output, NGX_HTTP_RM_DEFAULT_COOKIE_LEN);
fake_1->data[NGX_HTTP_RM_DEFAULT_COOKIE_LEN] = 0;
fake_1->len = NGX_HTTP_RM_DEFAULT_COOKIE_LEN;
}
if (fake_2 != NULL) {
memset(source, 0, 512);
source_len = snprintf((char *)source, 512, "%d", (int)(ra - t));
ngx_sha1_init(&sha1_state);
ngx_sha1_update(&sha1_state, source, source_len);
ngx_sha1_final(sha1_digest, &sha1_state);
for (di = 0; di < 20; di++) {
sprintf((char *)hex_output + di * 2, "%02x", sha1_digest[di]);
}
memcpy(fake_2->data, hex_output, NGX_HTTP_RM_DEFAULT_COOKIE_LEN);
fake_2->data[NGX_HTTP_RM_DEFAULT_COOKIE_LEN] = 0;
fake_2->len = NGX_HTTP_RM_DEFAULT_COOKIE_LEN;
}
return NGX_OK;
}
static ngx_int_t
ngx_http_rm_generate_cookie(ngx_http_request_t *r, ngx_str_t *cookie,
ngx_int_t timeout)
{
ngx_sha1_t sha1_state;
u_char sha1_digest[20];
u_char hex_output[20 * 2 + 1], *source;
ngx_uint_t di, source_len = 0;
ngx_uint_t port_time_len;
ngx_http_rm_loc_conf_t *rlcf;
ngx_str_t hash;
rlcf = ngx_http_get_module_loc_conf(r, ngx_http_robot_mitigation_module);
if (ngx_http_complex_value(r, &rlcf->hash, &hash) != NGX_OK) {
return NGX_ERROR;
}
source_len = hash.len + rlcf->secret.len;
source = ngx_pcalloc(r->pool, source_len + 1 + 32);
if (source == NULL) {
return NGX_ERROR;
}
memcpy(source, hash.data, hash.len);
memcpy(source + hash.len, rlcf->secret.data, rlcf->secret.len);
port_time_len = sprintf((char *)source + source_len, "@%ld",
(unsigned long)timeout);
if (port_time_len <= 0) {
return NGX_ERROR;
}
source_len += port_time_len;
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"cookie source: %s", source);
ngx_sha1_init(&sha1_state);
ngx_sha1_update(&sha1_state, source, source_len);
ngx_sha1_final(sha1_digest, &sha1_state);
for (di = 0; di < 20; di++) {
sprintf((char *)hex_output + di * 2, "%02x", sha1_digest[di]);
}
memcpy(cookie->data, hex_output, NGX_HTTP_RM_DEFAULT_COOKIE_LEN);
cookie->data[NGX_HTTP_RM_DEFAULT_COOKIE_LEN] = 0;
cookie->len = NGX_HTTP_RM_DEFAULT_COOKIE_LEN;
return NGX_OK;
}
static char *
ngx_http_rm_strstr(ngx_http_request_t *r,
ngx_str_t *haystack, ngx_str_t *needle)
{
char *a, *b;
a = ngx_pcalloc(r->pool, haystack->len + 1);
if (a == NULL) {
return NULL;
}
memcpy(a, haystack->data, haystack->len);
b = ngx_pcalloc(r->pool, needle->len + 1);
if (b == NULL) {
return NULL;
}
memcpy(b, needle->data, needle->len);
return ngx_strstr(a, b);
}
static ngx_int_t
ngx_http_rm_valid_cookie(ngx_http_request_t *r, ngx_str_t *gen_cookie)
{
ngx_http_rm_loc_conf_t *rlcf;
ngx_int_t ret;
ngx_str_t cookie;
rlcf = ngx_http_get_module_loc_conf(r, ngx_http_robot_mitigation_module);
ret = ngx_http_parse_multi_header_lines(&r->headers_in.cookies,
&rlcf->cookie_name, &cookie);
if (ret == NGX_DECLINED
|| cookie.len == 0) {
return NGX_HTTP_RM_RET_INVALID_COOKIE;
}
/* find a cookie, check the value then */
if (!ngx_http_rm_strstr(r, &cookie, gen_cookie)) {
return NGX_HTTP_RM_RET_INVALID_COOKIE;
}
return NGX_OK;
}
ngx_int_t ngx_http_rm_special_swf_uri(ngx_http_request_t *r)
{
if (r->uri.len > sizeof(NGX_HTTP_RM_SWF_FILENAME_PREFIX)
&& ngx_strstr(r->uri.data,
NGX_HTTP_RM_SWF_FILENAME_PREFIX)) {
return 1;
}
return 0;
}
static ngx_int_t
ngx_http_rm_check_ajax_request(ngx_http_request_t *r)
{
ngx_table_elt_t *h;
ngx_list_part_t *part;
ngx_uint_t i;
part = &r->headers_in.headers.part;
h = part->elts;
for (i = 0; i < part->nelts; i++) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ajax_request_check: %V %V", &h[i].key, &h[i].value);
if (h[i].key.len != NGX_HTTP_RM_AJAX_KEY_LEN) {
continue;
}
if (!ngx_strncasecmp(h[i].key.data, (u_char *)NGX_HTTP_RM_AJAX_KEY,
NGX_HTTP_RM_AJAX_KEY_LEN)) {
/* key matched, check value */
if (h[i].value.len != NGX_HTTP_RM_AJAX_VALUE_LEN) {
continue;
}
if (!ngx_strncasecmp(h[i].value.data,
(u_char *)NGX_HTTP_RM_AJAX_VALUE,
NGX_HTTP_RM_AJAX_VALUE_LEN)) {
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"ajax_request_match: %V %V", &h[i].key, &h[i].value);
return 1;
}
}
}
return 0;
}
static void
ngx_http_rm_dns_timeout_handler(ngx_event_t *event)
{
ngx_http_rm_dns_t *node;
node = event->data;
ngx_rbtree_delete(&ngx_http_rm_dns_rbtree, &node->node);
free(node->name.data);
free(node);
}
static void
ngx_http_rm_resolve_addr_handler(ngx_resolver_ctx_t *ctx)
{
ngx_http_request_t *r;
ngx_http_rm_dns_t *node;
uint32_t hash;
r = ctx->data;
r->phase_handler = NGX_HTTP_NETEYE_SECURITY_PHASE;
r->se_handler = ngx_http_rm_request_handler;
hash = ngx_crc32_short(r->connection->addr_text.data,
r->connection->addr_text.len);
node = ngx_http_rm_dns_lookup(&ngx_http_rm_dns_rbtree,
&r->connection->addr_text, hash);
if (node == NULL) {
node = calloc(1, sizeof(*node));
if (node == NULL) {
goto no_memory;
}
if (ctx->name.len > 0) {
node->name.data = calloc(1, ctx->name.len);
if (node->name.data == NULL) {
free(node);
goto no_memory;
}
memcpy(node->name.data, ctx->name.data, ctx->name.len);
}
node->name.len = ctx->name.len;
memcpy(node->addr, r->connection->addr_text.data,
r->connection->addr_text.len);
node->len = r->connection->addr_text.len;
node->timeout_ev.handler = ngx_http_rm_dns_timeout_handler;
node->timeout_ev.data = node;
node->timeout_ev.timer_set = 0;
node->timeout_ev.log = &ngx_http_rm_timer_log;
ngx_add_timer(&node->timeout_ev, NGX_HTTP_RM_ADDR_TIMEOUT);
node->node.key = hash;
ngx_rbtree_insert(&ngx_http_rm_dns_rbtree, &node->node);
}
ngx_resolve_addr_done(ctx);
r->rm_resolve_ctx = NULL;
ngx_http_core_run_phases(r);
return;
no_memory:
ngx_resolve_addr_done(ctx);
r->rm_resolve_ctx = NULL;
ngx_http_finalize_request(r, NGX_ERROR);
}
static void
ngx_http_rm_cleanup(void *data)
{
ngx_http_request_t *r = data;
if (r->rm_resolve_ctx) {
ngx_resolve_addr_done(r->rm_resolve_ctx);
r->rm_resolve_ctx = NULL;
}
}
static ngx_int_t
ngx_http_rm_request_handler(ngx_http_request_t *r)
{
ngx_http_rm_loc_conf_t *rlcf;
ngx_http_rm_main_conf_t *rmcf;
ngx_resolver_ctx_t *rctx;
ngx_http_rm_req_ctx_t *ctx;
ngx_str_t cookie, user_agent;
ngx_str_t cookie_f1, cookie_f2;
ngx_str_t src_addr_text;
ngx_str_t *domain_name = NULL;
ngx_int_t ret;
ngx_http_rm_whitelist_item_t *item;
ngx_http_rm_ip_whitelist_item_t *ip_item;
ngx_uint_t i;
ngx_int_t gen_time;
in_addr_t src_addr;
ngx_http_rm_dns_t *node;
uint32_t hash;
ngx_http_cleanup_t *cln;
#if (NGX_HTTP_X_FORWARDED_FOR)
ngx_array_t *xfwd;
ngx_table_elt_t **h;
#endif