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1.1 misho 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: }