1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_http.h>
11
12
13 typedef struct {
14 in_addr_t mask;
15 in_addr_t addr;
16 ngx_uint_t deny; /* unsigned deny:1; */
17 } ngx_http_access_rule_t;
18
19 #if (NGX_HAVE_INET6)
20
21 typedef struct {
22 struct in6_addr addr;
23 struct in6_addr mask;
24 ngx_uint_t deny; /* unsigned deny:1; */
25 } ngx_http_access_rule6_t;
26
27 #endif
28
29 typedef struct {
30 ngx_array_t *rules; /* array of ngx_http_access_rule_t */
31 #if (NGX_HAVE_INET6)
32 ngx_array_t *rules6; /* array of ngx_http_access_rule6_t */
33 #endif
34 } ngx_http_access_loc_conf_t;
35
36
37 static ngx_int_t ngx_http_access_handler(ngx_http_request_t *r);
38 static ngx_int_t ngx_http_access_inet(ngx_http_request_t *r,
39 ngx_http_access_loc_conf_t *alcf, in_addr_t addr);
40 #if (NGX_HAVE_INET6)
41 static ngx_int_t ngx_http_access_inet6(ngx_http_request_t *r,
42 ngx_http_access_loc_conf_t *alcf, u_char *p);
43 #endif
44 static ngx_int_t ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny);
45 static char *ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
46 void *conf);
47 static void *ngx_http_access_create_loc_conf(ngx_conf_t *cf);
48 static char *ngx_http_access_merge_loc_conf(ngx_conf_t *cf,
49 void *parent, void *child);
50 static ngx_int_t ngx_http_access_init(ngx_conf_t *cf);
51
52
53 static ngx_command_t ngx_http_access_commands[] = {
54
55 { ngx_string("allow"),
56 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
57 |NGX_CONF_TAKE1,
58 ngx_http_access_rule,
59 NGX_HTTP_LOC_CONF_OFFSET,
60 0,
61 NULL },
62
63 { ngx_string("deny"),
64 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_HTTP_LMT_CONF
65 |NGX_CONF_TAKE1,
66 ngx_http_access_rule,
67 NGX_HTTP_LOC_CONF_OFFSET,
68 0,
69 NULL },
70
71 ngx_null_command
72 };
73
74
75
76 static ngx_http_module_t ngx_http_access_module_ctx = {
77 NULL, /* preconfiguration */
78 ngx_http_access_init, /* postconfiguration */
79
80 NULL, /* create main configuration */
81 NULL, /* init main configuration */
82
83 NULL, /* create server configuration */
84 NULL, /* merge server configuration */
85
86 ngx_http_access_create_loc_conf, /* create location configuration */
87 ngx_http_access_merge_loc_conf /* merge location configuration */
88 };
89
90
91 ngx_module_t ngx_http_access_module = {
92 NGX_MODULE_V1,
93 &ngx_http_access_module_ctx, /* module context */
94 ngx_http_access_commands, /* module directives */
95 NGX_HTTP_MODULE, /* module type */
96 NULL, /* init master */
97 NULL, /* init module */
98 NULL, /* init process */
99 NULL, /* init thread */
100 NULL, /* exit thread */
101 NULL, /* exit process */
102 NULL, /* exit master */
103 NGX_MODULE_V1_PADDING
104 };
105
106
107 static ngx_int_t
108 ngx_http_access_handler(ngx_http_request_t *r)
109 {
110 struct sockaddr_in *sin;
111 ngx_http_access_loc_conf_t *alcf;
112 #if (NGX_HAVE_INET6)
113 u_char *p;
114 in_addr_t addr;
115 struct sockaddr_in6 *sin6;
116 #endif
117
118 alcf = ngx_http_get_module_loc_conf(r, ngx_http_access_module);
119
120 switch (r->connection->sockaddr->sa_family) {
121
122 case AF_INET:
123 if (alcf->rules) {
124 sin = (struct sockaddr_in *) r->connection->sockaddr;
125 return ngx_http_access_inet(r, alcf, sin->sin_addr.s_addr);
126 }
127 break;
128
129 #if (NGX_HAVE_INET6)
130
131 case AF_INET6:
132 sin6 = (struct sockaddr_in6 *) r->connection->sockaddr;
133 p = sin6->sin6_addr.s6_addr;
134
135 if (alcf->rules && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
136 addr = p[12] << 24;
137 addr += p[13] << 16;
138 addr += p[14] << 8;
139 addr += p[15];
140 return ngx_http_access_inet(r, alcf, htonl(addr));
141 }
142
143 if (alcf->rules6) {
144 return ngx_http_access_inet6(r, alcf, p);
145 }
146
147 #endif
148 }
149
150 return NGX_DECLINED;
151 }
152
153
154 static ngx_int_t
155 ngx_http_access_inet(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
156 in_addr_t addr)
157 {
158 ngx_uint_t i;
159 ngx_http_access_rule_t *rule;
160
161 rule = alcf->rules->elts;
162 for (i = 0; i < alcf->rules->nelts; i++) {
163
164 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
165 "access: %08XD %08XD %08XD",
166 addr, rule[i].mask, rule[i].addr);
167
168 if ((addr & rule[i].mask) == rule[i].addr) {
169 return ngx_http_access_found(r, rule[i].deny);
170 }
171 }
172
173 return NGX_DECLINED;
174 }
175
176
177 #if (NGX_HAVE_INET6)
178
179 static ngx_int_t
180 ngx_http_access_inet6(ngx_http_request_t *r, ngx_http_access_loc_conf_t *alcf,
181 u_char *p)
182 {
183 ngx_uint_t n;
184 ngx_uint_t i;
185 ngx_http_access_rule6_t *rule6;
186
187 rule6 = alcf->rules6->elts;
188 for (i = 0; i < alcf->rules6->nelts; i++) {
189
190 #if (NGX_DEBUG)
191 {
192 size_t cl, ml, al;
193 u_char ct[NGX_INET6_ADDRSTRLEN];
194 u_char mt[NGX_INET6_ADDRSTRLEN];
195 u_char at[NGX_INET6_ADDRSTRLEN];
196
197 cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
198 ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
199 al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);
200
201 ngx_log_debug6(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
202 "access: %*s %*s %*s", cl, ct, ml, mt, al, at);
203 }
204 #endif
205
206 for (n = 0; n < 16; n++) {
207 if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
208 goto next;
209 }
210 }
211
212 return ngx_http_access_found(r, rule6[i].deny);
213
214 next:
215 continue;
216 }
217
218 return NGX_DECLINED;
219 }
220
221 #endif
222
223
224 static ngx_int_t
225 ngx_http_access_found(ngx_http_request_t *r, ngx_uint_t deny)
226 {
227 ngx_http_core_loc_conf_t *clcf;
228
229 if (deny) {
230 clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
231
232 if (clcf->satisfy == NGX_HTTP_SATISFY_ALL) {
233 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
234 "access forbidden by rule");
235 }
236
237 return NGX_HTTP_FORBIDDEN;
238 }
239
240 return NGX_OK;
241 }
242
243
244 static char *
245 ngx_http_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
246 {
247 ngx_http_access_loc_conf_t *alcf = conf;
248
249 ngx_int_t rc;
250 ngx_uint_t all;
251 ngx_str_t *value;
252 ngx_cidr_t cidr;
253 ngx_http_access_rule_t *rule;
254 #if (NGX_HAVE_INET6)
255 ngx_http_access_rule6_t *rule6;
256 #endif
257
258 ngx_memzero(&cidr, sizeof(ngx_cidr_t));
259
260 value = cf->args->elts;
261
262 all = (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0);
263
264 if (!all) {
265
266 rc = ngx_ptocidr(&value[1], &cidr);
267
268 if (rc == NGX_ERROR) {
269 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
270 "invalid parameter \"%V\"", &value[1]);
271 return NGX_CONF_ERROR;
272 }
273
274 if (rc == NGX_DONE) {
275 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
276 "low address bits of %V are meaningless", &value[1]);
277 }
278 }
279
280 switch (cidr.family) {
281
282 #if (NGX_HAVE_INET6)
283 case AF_INET6:
284 case 0: /* all */
285
286 if (alcf->rules6 == NULL) {
287 alcf->rules6 = ngx_array_create(cf->pool, 4,
288 sizeof(ngx_http_access_rule6_t));
289 if (alcf->rules6 == NULL) {
290 return NGX_CONF_ERROR;
291 }
292 }
293
294 rule6 = ngx_array_push(alcf->rules6);
295 if (rule6 == NULL) {
296 return NGX_CONF_ERROR;
297 }
298
299 rule6->mask = cidr.u.in6.mask;
300 rule6->addr = cidr.u.in6.addr;
301 rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
302
303 if (!all) {
304 break;
305 }
306
307 /* "all" passes through */
308 #endif
309
310 default: /* AF_INET */
311
312 if (alcf->rules == NULL) {
313 alcf->rules = ngx_array_create(cf->pool, 4,
314 sizeof(ngx_http_access_rule_t));
315 if (alcf->rules == NULL) {
316 return NGX_CONF_ERROR;
317 }
318 }
319
320 rule = ngx_array_push(alcf->rules);
321 if (rule == NULL) {
322 return NGX_CONF_ERROR;
323 }
324
325 rule->mask = cidr.u.in.mask;
326 rule->addr = cidr.u.in.addr;
327 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
328 }
329
330 return NGX_CONF_OK;
331 }
332
333
334 static void *
335 ngx_http_access_create_loc_conf(ngx_conf_t *cf)
336 {
337 ngx_http_access_loc_conf_t *conf;
338
339 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_access_loc_conf_t));
340 if (conf == NULL) {
341 return NULL;
342 }
343
344 return conf;
345 }
346
347
348 static char *
349 ngx_http_access_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
350 {
351 ngx_http_access_loc_conf_t *prev = parent;
352 ngx_http_access_loc_conf_t *conf = child;
353
354 #if (NGX_HAVE_INET6)
355
356 if (conf->rules == NULL && conf->rules6 == NULL) {
357 conf->rules = prev->rules;
358 conf->rules6 = prev->rules6;
359 }
360
361 #else
362
363 if (conf->rules == NULL) {
364 conf->rules = prev->rules;
365 }
366
367 #endif
368
369 return NGX_CONF_OK;
370 }
371
372
373 static ngx_int_t
374 ngx_http_access_init(ngx_conf_t *cf)
375 {
376 ngx_http_handler_pt *h;
377 ngx_http_core_main_conf_t *cmcf;
378
379 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
380
381 h = ngx_array_push(&cmcf->phases[NGX_HTTP_ACCESS_PHASE].handlers);
382 if (h == NULL) {
383 return NGX_ERROR;
384 }
385
386 *h = ngx_http_access_handler;
387
388 return NGX_OK;
389 }
390
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