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_stream.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_stream_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_stream_access_rule6_t;
26
27 #endif
28
29 #if (NGX_HAVE_UNIX_DOMAIN)
30
31 typedef struct {
32 ngx_uint_t deny; /* unsigned deny:1; */
33 } ngx_stream_access_rule_un_t;
34
35 #endif
36
37 typedef struct {
38 ngx_array_t *rules; /* array of ngx_stream_access_rule_t */
39 #if (NGX_HAVE_INET6)
40 ngx_array_t *rules6; /* array of ngx_stream_access_rule6_t */
41 #endif
42 #if (NGX_HAVE_UNIX_DOMAIN)
43 ngx_array_t *rules_un; /* array of ngx_stream_access_rule_un_t */
44 #endif
45 } ngx_stream_access_srv_conf_t;
46
47
48 static ngx_int_t ngx_stream_access_handler(ngx_stream_session_t *s);
49 static ngx_int_t ngx_stream_access_inet(ngx_stream_session_t *s,
50 ngx_stream_access_srv_conf_t *ascf, in_addr_t addr);
51 #if (NGX_HAVE_INET6)
52 static ngx_int_t ngx_stream_access_inet6(ngx_stream_session_t *s,
53 ngx_stream_access_srv_conf_t *ascf, u_char *p);
54 #endif
55 #if (NGX_HAVE_UNIX_DOMAIN)
56 static ngx_int_t ngx_stream_access_unix(ngx_stream_session_t *s,
57 ngx_stream_access_srv_conf_t *ascf);
58 #endif
59 static ngx_int_t ngx_stream_access_found(ngx_stream_session_t *s,
60 ngx_uint_t deny);
61 static char *ngx_stream_access_rule(ngx_conf_t *cf, ngx_command_t *cmd,
62 void *conf);
63 static void *ngx_stream_access_create_srv_conf(ngx_conf_t *cf);
64 static char *ngx_stream_access_merge_srv_conf(ngx_conf_t *cf,
65 void *parent, void *child);
66 static ngx_int_t ngx_stream_access_init(ngx_conf_t *cf);
67
68
69 static ngx_command_t ngx_stream_access_commands[] = {
70
71 { ngx_string("allow"),
72 NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
73 ngx_stream_access_rule,
74 NGX_STREAM_SRV_CONF_OFFSET,
75 0,
76 NULL },
77
78 { ngx_string("deny"),
79 NGX_STREAM_MAIN_CONF|NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
80 ngx_stream_access_rule,
81 NGX_STREAM_SRV_CONF_OFFSET,
82 0,
83 NULL },
84
85 ngx_null_command
86 };
87
88
89
90 static ngx_stream_module_t ngx_stream_access_module_ctx = {
91 NULL, /* preconfiguration */
92 ngx_stream_access_init, /* postconfiguration */
93
94 NULL, /* create main configuration */
95 NULL, /* init main configuration */
96
97 ngx_stream_access_create_srv_conf, /* create server configuration */
98 ngx_stream_access_merge_srv_conf /* merge server configuration */
99 };
100
101
102 ngx_module_t ngx_stream_access_module = {
103 NGX_MODULE_V1,
104 &ngx_stream_access_module_ctx, /* module context */
105 ngx_stream_access_commands, /* module directives */
106 NGX_STREAM_MODULE, /* module type */
107 NULL, /* init master */
108 NULL, /* init module */
109 NULL, /* init process */
110 NULL, /* init thread */
111 NULL, /* exit thread */
112 NULL, /* exit process */
113 NULL, /* exit master */
114 NGX_MODULE_V1_PADDING
115 };
116
117
118 static ngx_int_t
ngx_stream_access_handler(ngx_stream_session_t * s)119 ngx_stream_access_handler(ngx_stream_session_t *s)
120 {
121 struct sockaddr_in *sin;
122 ngx_stream_access_srv_conf_t *ascf;
123 #if (NGX_HAVE_INET6)
124 u_char *p;
125 in_addr_t addr;
126 struct sockaddr_in6 *sin6;
127 #endif
128
129 ascf = ngx_stream_get_module_srv_conf(s, ngx_stream_access_module);
130
131 switch (s->connection->sockaddr->sa_family) {
132
133 case AF_INET:
134 if (ascf->rules) {
135 sin = (struct sockaddr_in *) s->connection->sockaddr;
136 return ngx_stream_access_inet(s, ascf, sin->sin_addr.s_addr);
137 }
138 break;
139
140 #if (NGX_HAVE_INET6)
141
142 case AF_INET6:
143 sin6 = (struct sockaddr_in6 *) s->connection->sockaddr;
144 p = sin6->sin6_addr.s6_addr;
145
146 if (ascf->rules && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
147 addr = p[12] << 24;
148 addr += p[13] << 16;
149 addr += p[14] << 8;
150 addr += p[15];
151 return ngx_stream_access_inet(s, ascf, htonl(addr));
152 }
153
154 if (ascf->rules6) {
155 return ngx_stream_access_inet6(s, ascf, p);
156 }
157
158 break;
159
160 #endif
161
162 #if (NGX_HAVE_UNIX_DOMAIN)
163
164 case AF_UNIX:
165 if (ascf->rules_un) {
166 return ngx_stream_access_unix(s, ascf);
167 }
168
169 break;
170
171 #endif
172 }
173
174 return NGX_DECLINED;
175 }
176
177
178 static ngx_int_t
ngx_stream_access_inet(ngx_stream_session_t * s,ngx_stream_access_srv_conf_t * ascf,in_addr_t addr)179 ngx_stream_access_inet(ngx_stream_session_t *s,
180 ngx_stream_access_srv_conf_t *ascf, in_addr_t addr)
181 {
182 ngx_uint_t i;
183 ngx_stream_access_rule_t *rule;
184
185 rule = ascf->rules->elts;
186 for (i = 0; i < ascf->rules->nelts; i++) {
187
188 ngx_log_debug3(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
189 "access: %08XD %08XD %08XD",
190 addr, rule[i].mask, rule[i].addr);
191
192 if ((addr & rule[i].mask) == rule[i].addr) {
193 return ngx_stream_access_found(s, rule[i].deny);
194 }
195 }
196
197 return NGX_DECLINED;
198 }
199
200
201 #if (NGX_HAVE_INET6)
202
203 static ngx_int_t
ngx_stream_access_inet6(ngx_stream_session_t * s,ngx_stream_access_srv_conf_t * ascf,u_char * p)204 ngx_stream_access_inet6(ngx_stream_session_t *s,
205 ngx_stream_access_srv_conf_t *ascf, u_char *p)
206 {
207 ngx_uint_t n;
208 ngx_uint_t i;
209 ngx_stream_access_rule6_t *rule6;
210
211 rule6 = ascf->rules6->elts;
212 for (i = 0; i < ascf->rules6->nelts; i++) {
213
214 #if (NGX_DEBUG)
215 {
216 size_t cl, ml, al;
217 u_char ct[NGX_INET6_ADDRSTRLEN];
218 u_char mt[NGX_INET6_ADDRSTRLEN];
219 u_char at[NGX_INET6_ADDRSTRLEN];
220
221 cl = ngx_inet6_ntop(p, ct, NGX_INET6_ADDRSTRLEN);
222 ml = ngx_inet6_ntop(rule6[i].mask.s6_addr, mt, NGX_INET6_ADDRSTRLEN);
223 al = ngx_inet6_ntop(rule6[i].addr.s6_addr, at, NGX_INET6_ADDRSTRLEN);
224
225 ngx_log_debug6(NGX_LOG_DEBUG_STREAM, s->connection->log, 0,
226 "access: %*s %*s %*s", cl, ct, ml, mt, al, at);
227 }
228 #endif
229
230 for (n = 0; n < 16; n++) {
231 if ((p[n] & rule6[i].mask.s6_addr[n]) != rule6[i].addr.s6_addr[n]) {
232 goto next;
233 }
234 }
235
236 return ngx_stream_access_found(s, rule6[i].deny);
237
238 next:
239 continue;
240 }
241
242 return NGX_DECLINED;
243 }
244
245 #endif
246
247
248 #if (NGX_HAVE_UNIX_DOMAIN)
249
250 static ngx_int_t
ngx_stream_access_unix(ngx_stream_session_t * s,ngx_stream_access_srv_conf_t * ascf)251 ngx_stream_access_unix(ngx_stream_session_t *s,
252 ngx_stream_access_srv_conf_t *ascf)
253 {
254 ngx_uint_t i;
255 ngx_stream_access_rule_un_t *rule_un;
256
257 rule_un = ascf->rules_un->elts;
258 for (i = 0; i < ascf->rules_un->nelts; i++) {
259
260 /* TODO: check path */
261 if (1) {
262 return ngx_stream_access_found(s, rule_un[i].deny);
263 }
264 }
265
266 return NGX_DECLINED;
267 }
268
269 #endif
270
271
272 static ngx_int_t
ngx_stream_access_found(ngx_stream_session_t * s,ngx_uint_t deny)273 ngx_stream_access_found(ngx_stream_session_t *s, ngx_uint_t deny)
274 {
275 if (deny) {
276 ngx_log_error(NGX_LOG_ERR, s->connection->log, 0,
277 "access forbidden by rule");
278 return NGX_STREAM_FORBIDDEN;
279 }
280
281 return NGX_OK;
282 }
283
284
285 static char *
ngx_stream_access_rule(ngx_conf_t * cf,ngx_command_t * cmd,void * conf)286 ngx_stream_access_rule(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
287 {
288 ngx_stream_access_srv_conf_t *ascf = conf;
289
290 ngx_int_t rc;
291 ngx_uint_t all;
292 ngx_str_t *value;
293 ngx_cidr_t cidr;
294 ngx_stream_access_rule_t *rule;
295 #if (NGX_HAVE_INET6)
296 ngx_stream_access_rule6_t *rule6;
297 #endif
298 #if (NGX_HAVE_UNIX_DOMAIN)
299 ngx_stream_access_rule_un_t *rule_un;
300 #endif
301
302 all = 0;
303 ngx_memzero(&cidr, sizeof(ngx_cidr_t));
304
305 value = cf->args->elts;
306
307 if (value[1].len == 3 && ngx_strcmp(value[1].data, "all") == 0) {
308 all = 1;
309
310 #if (NGX_HAVE_UNIX_DOMAIN)
311 } else if (value[1].len == 5 && ngx_strcmp(value[1].data, "unix:") == 0) {
312 cidr.family = AF_UNIX;
313 #endif
314
315 } else {
316 rc = ngx_ptocidr(&value[1], &cidr);
317
318 if (rc == NGX_ERROR) {
319 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
320 "invalid parameter \"%V\"", &value[1]);
321 return NGX_CONF_ERROR;
322 }
323
324 if (rc == NGX_DONE) {
325 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
326 "low address bits of %V are meaningless", &value[1]);
327 }
328 }
329
330 if (cidr.family == AF_INET || all) {
331
332 if (ascf->rules == NULL) {
333 ascf->rules = ngx_array_create(cf->pool, 4,
334 sizeof(ngx_stream_access_rule_t));
335 if (ascf->rules == NULL) {
336 return NGX_CONF_ERROR;
337 }
338 }
339
340 rule = ngx_array_push(ascf->rules);
341 if (rule == NULL) {
342 return NGX_CONF_ERROR;
343 }
344
345 rule->mask = cidr.u.in.mask;
346 rule->addr = cidr.u.in.addr;
347 rule->deny = (value[0].data[0] == 'd') ? 1 : 0;
348 }
349
350 #if (NGX_HAVE_INET6)
351 if (cidr.family == AF_INET6 || all) {
352
353 if (ascf->rules6 == NULL) {
354 ascf->rules6 = ngx_array_create(cf->pool, 4,
355 sizeof(ngx_stream_access_rule6_t));
356 if (ascf->rules6 == NULL) {
357 return NGX_CONF_ERROR;
358 }
359 }
360
361 rule6 = ngx_array_push(ascf->rules6);
362 if (rule6 == NULL) {
363 return NGX_CONF_ERROR;
364 }
365
366 rule6->mask = cidr.u.in6.mask;
367 rule6->addr = cidr.u.in6.addr;
368 rule6->deny = (value[0].data[0] == 'd') ? 1 : 0;
369 }
370 #endif
371
372 #if (NGX_HAVE_UNIX_DOMAIN)
373 if (cidr.family == AF_UNIX || all) {
374
375 if (ascf->rules_un == NULL) {
376 ascf->rules_un = ngx_array_create(cf->pool, 1,
377 sizeof(ngx_stream_access_rule_un_t));
378 if (ascf->rules_un == NULL) {
379 return NGX_CONF_ERROR;
380 }
381 }
382
383 rule_un = ngx_array_push(ascf->rules_un);
384 if (rule_un == NULL) {
385 return NGX_CONF_ERROR;
386 }
387
388 rule_un->deny = (value[0].data[0] == 'd') ? 1 : 0;
389 }
390 #endif
391
392 return NGX_CONF_OK;
393 }
394
395
396 static void *
ngx_stream_access_create_srv_conf(ngx_conf_t * cf)397 ngx_stream_access_create_srv_conf(ngx_conf_t *cf)
398 {
399 ngx_stream_access_srv_conf_t *conf;
400
401 conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_access_srv_conf_t));
402 if (conf == NULL) {
403 return NULL;
404 }
405
406 return conf;
407 }
408
409
410 static char *
ngx_stream_access_merge_srv_conf(ngx_conf_t * cf,void * parent,void * child)411 ngx_stream_access_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
412 {
413 ngx_stream_access_srv_conf_t *prev = parent;
414 ngx_stream_access_srv_conf_t *conf = child;
415
416 if (conf->rules == NULL
417 #if (NGX_HAVE_INET6)
418 && conf->rules6 == NULL
419 #endif
420 #if (NGX_HAVE_UNIX_DOMAIN)
421 && conf->rules_un == NULL
422 #endif
423 ) {
424 conf->rules = prev->rules;
425 #if (NGX_HAVE_INET6)
426 conf->rules6 = prev->rules6;
427 #endif
428 #if (NGX_HAVE_UNIX_DOMAIN)
429 conf->rules_un = prev->rules_un;
430 #endif
431 }
432
433 return NGX_CONF_OK;
434 }
435
436
437 static ngx_int_t
ngx_stream_access_init(ngx_conf_t * cf)438 ngx_stream_access_init(ngx_conf_t *cf)
439 {
440 ngx_stream_handler_pt *h;
441 ngx_stream_core_main_conf_t *cmcf;
442
443 cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
444
445 h = ngx_array_push(&cmcf->phases[NGX_STREAM_ACCESS_PHASE].handlers);
446 if (h == NULL) {
447 return NGX_ERROR;
448 }
449
450 *h = ngx_stream_access_handler;
451
452 return NGX_OK;
453 }
454