Mercurial > hg > nginx
annotate src/http/modules/ngx_http_realip_module.c @ 4583:a1d5842064f7
Fixed buffer overflow when long URI is processed by "try_files" in
regex location with "alias" (fixes ticket #135).
author | Ruslan Ermilov <ru@nginx.com> |
---|---|
date | Thu, 12 Apr 2012 09:19:14 +0000 |
parents | b1950b0a9550 |
children | df93068953c0 |
rev | line source |
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573 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
573 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
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13 #define NGX_HTTP_REALIP_XREALIP 0 |
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14 #define NGX_HTTP_REALIP_XFWD 1 |
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15 #define NGX_HTTP_REALIP_HEADER 2 |
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16 |
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17 |
573 | 18 typedef struct { |
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19 ngx_array_t *from; /* array of ngx_in_cidr_t */ |
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20 ngx_uint_t type; |
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21 ngx_uint_t hash; |
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22 ngx_str_t header; |
3274 | 23 #if (NGX_HAVE_UNIX_DOMAIN) |
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24 ngx_uint_t unixsock; /* unsigned unixsock:2; */ |
3274 | 25 #endif |
573 | 26 } ngx_http_realip_loc_conf_t; |
27 | |
28 | |
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29 typedef struct { |
3274 | 30 ngx_connection_t *connection; |
31 struct sockaddr *sockaddr; | |
32 socklen_t socklen; | |
33 ngx_str_t addr_text; | |
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34 } ngx_http_realip_ctx_t; |
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35 |
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36 |
573 | 37 static ngx_int_t ngx_http_realip_handler(ngx_http_request_t *r); |
3274 | 38 static ngx_int_t ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip, |
39 size_t len); | |
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40 static void ngx_http_realip_cleanup(void *data); |
573 | 41 static char *ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, |
42 void *conf); | |
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43 static char *ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf); |
573 | 44 static void *ngx_http_realip_create_loc_conf(ngx_conf_t *cf); |
45 static char *ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, | |
46 void *parent, void *child); | |
681 | 47 static ngx_int_t ngx_http_realip_init(ngx_conf_t *cf); |
573 | 48 |
49 | |
50 static ngx_command_t ngx_http_realip_commands[] = { | |
51 | |
52 { ngx_string("set_real_ip_from"), | |
53 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
54 ngx_http_realip_from, | |
55 NGX_HTTP_LOC_CONF_OFFSET, | |
56 0, | |
57 NULL }, | |
58 | |
59 { ngx_string("real_ip_header"), | |
60 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1, | |
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61 ngx_http_realip, |
573 | 62 NGX_HTTP_LOC_CONF_OFFSET, |
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63 0, |
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64 NULL }, |
573 | 65 |
66 ngx_null_command | |
67 }; | |
68 | |
69 | |
70 | |
667 | 71 static ngx_http_module_t ngx_http_realip_module_ctx = { |
573 | 72 NULL, /* preconfiguration */ |
681 | 73 ngx_http_realip_init, /* postconfiguration */ |
573 | 74 |
75 NULL, /* create main configuration */ | |
76 NULL, /* init main configuration */ | |
77 | |
78 NULL, /* create server configuration */ | |
79 NULL, /* merge server configuration */ | |
80 | |
81 ngx_http_realip_create_loc_conf, /* create location configuration */ | |
82 ngx_http_realip_merge_loc_conf /* merge location configuration */ | |
83 }; | |
84 | |
85 | |
86 ngx_module_t ngx_http_realip_module = { | |
87 NGX_MODULE_V1, | |
88 &ngx_http_realip_module_ctx, /* module context */ | |
89 ngx_http_realip_commands, /* module directives */ | |
90 NGX_HTTP_MODULE, /* module type */ | |
91 NULL, /* init master */ | |
681 | 92 NULL, /* init module */ |
573 | 93 NULL, /* init process */ |
94 NULL, /* init thread */ | |
95 NULL, /* exit thread */ | |
96 NULL, /* exit process */ | |
97 NULL, /* exit master */ | |
98 NGX_MODULE_V1_PADDING | |
99 }; | |
100 | |
101 | |
102 static ngx_int_t | |
103 ngx_http_realip_handler(ngx_http_request_t *r) | |
104 { | |
105 u_char *ip, *p; | |
106 size_t len; | |
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107 ngx_uint_t i, hash; |
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108 ngx_list_part_t *part; |
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109 ngx_table_elt_t *header; |
573 | 110 struct sockaddr_in *sin; |
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111 ngx_in_cidr_t *from; |
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112 ngx_connection_t *c; |
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113 ngx_http_realip_ctx_t *ctx; |
573 | 114 ngx_http_realip_loc_conf_t *rlcf; |
115 | |
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116 ctx = ngx_http_get_module_ctx(r, ngx_http_realip_module); |
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117 |
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118 if (ctx) { |
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119 return NGX_DECLINED; |
573 | 120 } |
121 | |
122 rlcf = ngx_http_get_module_loc_conf(r, ngx_http_realip_module); | |
123 | |
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124 if (rlcf->from == NULL |
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125 #if (NGX_HAVE_UNIX_DOMAIN) |
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126 && !rlcf->unixsock |
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127 #endif |
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128 ) |
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129 { |
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130 return NGX_DECLINED; |
573 | 131 } |
132 | |
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133 switch (rlcf->type) { |
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134 |
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135 case NGX_HTTP_REALIP_XREALIP: |
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136 |
573 | 137 if (r->headers_in.x_real_ip == NULL) { |
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138 return NGX_DECLINED; |
573 | 139 } |
140 | |
141 len = r->headers_in.x_real_ip->value.len; | |
142 ip = r->headers_in.x_real_ip->value.data; | |
143 | |
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144 break; |
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145 |
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146 case NGX_HTTP_REALIP_XFWD: |
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147 |
573 | 148 if (r->headers_in.x_forwarded_for == NULL) { |
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149 return NGX_DECLINED; |
573 | 150 } |
151 | |
152 len = r->headers_in.x_forwarded_for->value.len; | |
153 ip = r->headers_in.x_forwarded_for->value.data; | |
154 | |
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155 for (p = ip + len - 1; p > ip; p--) { |
573 | 156 if (*p == ' ' || *p == ',') { |
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157 p++; |
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158 len -= p - ip; |
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159 ip = p; |
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160 break; |
573 | 161 } |
162 } | |
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163 |
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164 break; |
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165 |
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166 default: /* NGX_HTTP_REALIP_HEADER */ |
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167 |
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168 part = &r->headers_in.headers.part; |
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169 header = part->elts; |
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170 |
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171 hash = rlcf->hash; |
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172 len = rlcf->header.len; |
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173 p = rlcf->header.data; |
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174 |
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175 for (i = 0; /* void */ ; i++) { |
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176 |
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177 if (i >= part->nelts) { |
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178 if (part->next == NULL) { |
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179 break; |
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180 } |
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181 |
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182 part = part->next; |
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183 header = part->elts; |
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184 i = 0; |
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185 } |
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186 |
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187 if (hash == header[i].hash |
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188 && len == header[i].key.len |
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189 && ngx_strncmp(p, header[i].lowcase_key, len) == 0) |
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190 { |
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191 len = header[i].value.len; |
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192 ip = header[i].value.data; |
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193 |
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194 goto found; |
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195 } |
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196 } |
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197 |
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198 return NGX_DECLINED; |
573 | 199 } |
200 | |
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201 found: |
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202 |
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203 c = r->connection; |
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204 |
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205 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0, "realip: \"%s\"", ip); |
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206 |
573 | 207 /* AF_INET only */ |
208 | |
3274 | 209 if (c->sockaddr->sa_family == AF_INET) { |
210 sin = (struct sockaddr_in *) c->sockaddr; | |
211 | |
212 from = rlcf->from->elts; | |
213 for (i = 0; i < rlcf->from->nelts; i++) { | |
214 | |
215 ngx_log_debug3(NGX_LOG_DEBUG_HTTP, c->log, 0, | |
216 "realip: %08XD %08XD %08XD", | |
217 sin->sin_addr.s_addr, from[i].mask, from[i].addr); | |
218 | |
219 if ((sin->sin_addr.s_addr & from[i].mask) == from[i].addr) { | |
220 return ngx_http_realip_set_addr(r, ip, len); | |
221 } | |
222 } | |
223 } | |
224 | |
225 #if (NGX_HAVE_UNIX_DOMAIN) | |
226 | |
227 if (c->sockaddr->sa_family == AF_UNIX && rlcf->unixsock) { | |
228 return ngx_http_realip_set_addr(r, ip, len); | |
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229 } |
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230 |
3274 | 231 #endif |
573 | 232 |
3274 | 233 return NGX_DECLINED; |
234 } | |
235 | |
573 | 236 |
3274 | 237 static ngx_int_t |
238 ngx_http_realip_set_addr(ngx_http_request_t *r, u_char *ip, size_t len) | |
239 { | |
240 u_char *p; | |
241 ngx_int_t rc; | |
242 ngx_addr_t addr; | |
243 ngx_connection_t *c; | |
244 ngx_pool_cleanup_t *cln; | |
245 ngx_http_realip_ctx_t *ctx; | |
573 | 246 |
3274 | 247 cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_realip_ctx_t)); |
248 if (cln == NULL) { | |
249 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
250 } | |
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251 |
3274 | 252 ctx = cln->data; |
253 ngx_http_set_ctx(r, ctx, ngx_http_realip_module); | |
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254 |
3274 | 255 c = r->connection; |
256 | |
257 rc = ngx_parse_addr(c->pool, &addr, ip, len); | |
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258 |
3274 | 259 switch (rc) { |
260 case NGX_DECLINED: | |
261 return NGX_DECLINED; | |
262 case NGX_ERROR: | |
263 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
264 default: /* NGX_OK */ | |
265 break; | |
266 } | |
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267 |
3274 | 268 p = ngx_pnalloc(c->pool, len); |
269 if (p == NULL) { | |
270 return NGX_HTTP_INTERNAL_SERVER_ERROR; | |
271 } | |
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272 |
3274 | 273 ngx_memcpy(p, ip, len); |
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274 |
3274 | 275 cln->handler = ngx_http_realip_cleanup; |
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276 |
3274 | 277 ctx->connection = c; |
278 ctx->sockaddr = c->sockaddr; | |
279 ctx->socklen = c->socklen; | |
280 ctx->addr_text = c->addr_text; | |
573 | 281 |
3274 | 282 c->sockaddr = addr.sockaddr; |
283 c->socklen = addr.socklen; | |
284 c->addr_text.len = len; | |
285 c->addr_text.data = p; | |
573 | 286 |
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287 return NGX_DECLINED; |
573 | 288 } |
289 | |
290 | |
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291 static void |
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292 ngx_http_realip_cleanup(void *data) |
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293 { |
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294 ngx_http_realip_ctx_t *ctx = data; |
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295 |
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296 ngx_connection_t *c; |
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297 |
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298 c = ctx->connection; |
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299 |
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300 c->sockaddr = ctx->sockaddr; |
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301 c->socklen = ctx->socklen; |
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302 c->addr_text = ctx->addr_text; |
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303 } |
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304 |
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305 |
573 | 306 static char * |
307 ngx_http_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
308 { | |
309 ngx_http_realip_loc_conf_t *rlcf = conf; | |
310 | |
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311 ngx_int_t rc; |
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312 ngx_str_t *value; |
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313 ngx_cidr_t cidr; |
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314 ngx_in_cidr_t *from; |
573 | 315 |
3274 | 316 value = cf->args->elts; |
317 | |
318 #if (NGX_HAVE_UNIX_DOMAIN) | |
319 | |
320 if (ngx_strcmp(value[1].data, "unix:") == 0) { | |
321 rlcf->unixsock = 1; | |
322 return NGX_CONF_OK; | |
323 } | |
324 | |
325 #endif | |
326 | |
573 | 327 if (rlcf->from == NULL) { |
328 rlcf->from = ngx_array_create(cf->pool, 2, | |
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329 sizeof(ngx_in_cidr_t)); |
573 | 330 if (rlcf->from == NULL) { |
331 return NGX_CONF_ERROR; | |
332 } | |
333 } | |
334 | |
335 from = ngx_array_push(rlcf->from); | |
336 if (from == NULL) { | |
337 return NGX_CONF_ERROR; | |
338 } | |
339 | |
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340 rc = ngx_ptocidr(&value[1], &cidr); |
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341 |
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342 if (rc == NGX_ERROR) { |
573 | 343 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid parameter \"%V\"", |
344 &value[1]); | |
345 return NGX_CONF_ERROR; | |
346 } | |
347 | |
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348 if (cidr.family != AF_INET) { |
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349 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, |
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350 "\"set_real_ip_from\" supports IPv4 only"); |
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351 return NGX_CONF_ERROR; |
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352 } |
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353 |
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354 if (rc == NGX_DONE) { |
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355 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
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356 "low address bits of %V are meaningless", &value[1]); |
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357 } |
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358 |
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359 from->mask = cidr.u.in.mask; |
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360 from->addr = cidr.u.in.addr; |
573 | 361 |
362 return NGX_CONF_OK; | |
363 } | |
364 | |
365 | |
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366 static char * |
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367 ngx_http_realip(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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368 { |
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369 ngx_http_realip_loc_conf_t *rlcf = conf; |
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370 |
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371 ngx_str_t *value; |
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372 |
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373 value = cf->args->elts; |
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374 |
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375 if (ngx_strcmp(value[1].data, "X-Real-IP") == 0) { |
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376 rlcf->type = NGX_HTTP_REALIP_XREALIP; |
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377 return NGX_CONF_OK; |
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378 } |
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379 |
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380 if (ngx_strcmp(value[1].data, "X-Forwarded-For") == 0) { |
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381 rlcf->type = NGX_HTTP_REALIP_XFWD; |
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382 return NGX_CONF_OK; |
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383 } |
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384 |
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385 rlcf->type = NGX_HTTP_REALIP_HEADER; |
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386 rlcf->hash = ngx_hash_strlow(value[1].data, value[1].data, value[1].len); |
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387 rlcf->header = value[1]; |
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388 |
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389 return NGX_CONF_OK; |
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390 } |
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391 |
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392 |
573 | 393 static void * |
394 ngx_http_realip_create_loc_conf(ngx_conf_t *cf) | |
395 { | |
396 ngx_http_realip_loc_conf_t *conf; | |
397 | |
398 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_realip_loc_conf_t)); | |
399 if (conf == NULL) { | |
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400 return NULL; |
573 | 401 } |
402 | |
403 /* | |
404 * set by ngx_pcalloc(): | |
405 * | |
406 * conf->from = NULL; | |
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407 * conf->hash = 0; |
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408 * conf->header = { 0, NULL }; |
573 | 409 */ |
410 | |
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411 conf->type = NGX_CONF_UNSET_UINT; |
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412 #if (NGX_HAVE_UNIX_DOMAIN) |
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413 conf->unixsock = 2; |
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414 #endif |
573 | 415 |
416 return conf; | |
417 } | |
418 | |
419 | |
420 static char * | |
421 ngx_http_realip_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child) | |
422 { | |
423 ngx_http_realip_loc_conf_t *prev = parent; | |
424 ngx_http_realip_loc_conf_t *conf = child; | |
425 | |
426 if (conf->from == NULL) { | |
427 conf->from = prev->from; | |
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428 } |
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429 |
3274 | 430 #if (NGX_HAVE_UNIX_DOMAIN) |
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431 if (conf->unixsock == 2) { |
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432 conf->unixsock = (prev->unixsock == 2) ? 0 : prev->unixsock; |
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433 } |
3274 | 434 #endif |
573 | 435 |
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436 ngx_conf_merge_uint_value(conf->type, prev->type, NGX_HTTP_REALIP_XREALIP); |
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437 |
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438 if (conf->header.len == 0) { |
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439 conf->hash = prev->hash; |
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440 conf->header = prev->header; |
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441 } |
573 | 442 |
443 return NGX_CONF_OK; | |
444 } | |
445 | |
446 | |
447 static ngx_int_t | |
681 | 448 ngx_http_realip_init(ngx_conf_t *cf) |
573 | 449 { |
450 ngx_http_handler_pt *h; | |
451 ngx_http_core_main_conf_t *cmcf; | |
452 | |
681 | 453 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module); |
573 | 454 |
455 h = ngx_array_push(&cmcf->phases[NGX_HTTP_POST_READ_PHASE].handlers); | |
456 if (h == NULL) { | |
457 return NGX_ERROR; | |
458 } | |
459 | |
460 *h = ngx_http_realip_handler; | |
461 | |
581 | 462 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers); |
573 | 463 if (h == NULL) { |
464 return NGX_ERROR; | |
465 } | |
466 | |
467 *h = ngx_http_realip_handler; | |
468 | |
469 return NGX_OK; | |
470 } |