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comparison src/mail/ngx_mail_realip_module.c @ 7795:ef4bdbbce57e

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Mail: realip module. When configured with the "set_real_ip_from", it can set client's IP address as visible in logs to the one obtained via the PROXY protocol.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 05 Mar 2021 17:16:29 +0300
parents src/stream/ngx_stream_realip_module.c@06b01840bd42
children
comparison
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7794:12ea1de7d87c 7795:ef4bdbbce57e
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_mail.h>
11
12
13 typedef struct {
14 ngx_array_t *from; /* array of ngx_cidr_t */
15 } ngx_mail_realip_srv_conf_t;
16
17
18 static ngx_int_t ngx_mail_realip_set_addr(ngx_mail_session_t *s,
19 ngx_addr_t *addr);
20 static char *ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd,
21 void *conf);
22 static void *ngx_mail_realip_create_srv_conf(ngx_conf_t *cf);
23 static char *ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent,
24 void *child);
25
26
27 static ngx_command_t ngx_mail_realip_commands[] = {
28
29 { ngx_string("set_real_ip_from"),
30 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
31 ngx_mail_realip_from,
32 NGX_MAIL_SRV_CONF_OFFSET,
33 0,
34 NULL },
35
36 ngx_null_command
37 };
38
39
40 static ngx_mail_module_t ngx_mail_realip_module_ctx = {
41 NULL, /* protocol */
42
43 NULL, /* create main configuration */
44 NULL, /* init main configuration */
45
46 ngx_mail_realip_create_srv_conf, /* create server configuration */
47 ngx_mail_realip_merge_srv_conf /* merge server configuration */
48 };
49
50
51 ngx_module_t ngx_mail_realip_module = {
52 NGX_MODULE_V1,
53 &ngx_mail_realip_module_ctx, /* module context */
54 ngx_mail_realip_commands, /* module directives */
55 NGX_MAIL_MODULE, /* module type */
56 NULL, /* init master */
57 NULL, /* init module */
58 NULL, /* init process */
59 NULL, /* init thread */
60 NULL, /* exit thread */
61 NULL, /* exit process */
62 NULL, /* exit master */
63 NGX_MODULE_V1_PADDING
64 };
65
66
67 ngx_int_t
68 ngx_mail_realip_handler(ngx_mail_session_t *s)
69 {
70 ngx_addr_t addr;
71 ngx_connection_t *c;
72 ngx_mail_realip_srv_conf_t *rscf;
73
74 rscf = ngx_mail_get_module_srv_conf(s, ngx_mail_realip_module);
75
76 if (rscf->from == NULL) {
77 return NGX_OK;
78 }
79
80 c = s->connection;
81
82 if (c->proxy_protocol == NULL) {
83 return NGX_OK;
84 }
85
86 if (ngx_cidr_match(c->sockaddr, rscf->from) != NGX_OK) {
87 return NGX_OK;
88 }
89
90 if (ngx_parse_addr(c->pool, &addr, c->proxy_protocol->src_addr.data,
91 c->proxy_protocol->src_addr.len)
92 != NGX_OK)
93 {
94 return NGX_OK;
95 }
96
97 ngx_inet_set_port(addr.sockaddr, c->proxy_protocol->src_port);
98
99 return ngx_mail_realip_set_addr(s, &addr);
100 }
101
102
103 static ngx_int_t
104 ngx_mail_realip_set_addr(ngx_mail_session_t *s, ngx_addr_t *addr)
105 {
106 size_t len;
107 u_char *p;
108 u_char text[NGX_SOCKADDR_STRLEN];
109 ngx_connection_t *c;
110
111 c = s->connection;
112
113 len = ngx_sock_ntop(addr->sockaddr, addr->socklen, text,
114 NGX_SOCKADDR_STRLEN, 0);
115 if (len == 0) {
116 return NGX_ERROR;
117 }
118
119 p = ngx_pnalloc(c->pool, len);
120 if (p == NULL) {
121 return NGX_ERROR;
122 }
123
124 ngx_memcpy(p, text, len);
125
126 c->sockaddr = addr->sockaddr;
127 c->socklen = addr->socklen;
128 c->addr_text.len = len;
129 c->addr_text.data = p;
130
131 return NGX_OK;
132 }
133
134
135 static char *
136 ngx_mail_realip_from(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
137 {
138 ngx_mail_realip_srv_conf_t *rscf = conf;
139
140 ngx_int_t rc;
141 ngx_str_t *value;
142 ngx_url_t u;
143 ngx_cidr_t c, *cidr;
144 ngx_uint_t i;
145 struct sockaddr_in *sin;
146 #if (NGX_HAVE_INET6)
147 struct sockaddr_in6 *sin6;
148 #endif
149
150 value = cf->args->elts;
151
152 if (rscf->from == NULL) {
153 rscf->from = ngx_array_create(cf->pool, 2,
154 sizeof(ngx_cidr_t));
155 if (rscf->from == NULL) {
156 return NGX_CONF_ERROR;
157 }
158 }
159
160 #if (NGX_HAVE_UNIX_DOMAIN)
161
162 if (ngx_strcmp(value[1].data, "unix:") == 0) {
163 cidr = ngx_array_push(rscf->from);
164 if (cidr == NULL) {
165 return NGX_CONF_ERROR;
166 }
167
168 cidr->family = AF_UNIX;
169 return NGX_CONF_OK;
170 }
171
172 #endif
173
174 rc = ngx_ptocidr(&value[1], &c);
175
176 if (rc != NGX_ERROR) {
177 if (rc == NGX_DONE) {
178 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
179 "low address bits of %V are meaningless",
180 &value[1]);
181 }
182
183 cidr = ngx_array_push(rscf->from);
184 if (cidr == NULL) {
185 return NGX_CONF_ERROR;
186 }
187
188 *cidr = c;
189
190 return NGX_CONF_OK;
191 }
192
193 ngx_memzero(&u, sizeof(ngx_url_t));
194 u.host = value[1];
195
196 if (ngx_inet_resolve_host(cf->pool, &u) != NGX_OK) {
197 if (u.err) {
198 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
199 "%s in set_real_ip_from \"%V\"",
200 u.err, &u.host);
201 }
202
203 return NGX_CONF_ERROR;
204 }
205
206 cidr = ngx_array_push_n(rscf->from, u.naddrs);
207 if (cidr == NULL) {
208 return NGX_CONF_ERROR;
209 }
210
211 ngx_memzero(cidr, u.naddrs * sizeof(ngx_cidr_t));
212
213 for (i = 0; i < u.naddrs; i++) {
214 cidr[i].family = u.addrs[i].sockaddr->sa_family;
215
216 switch (cidr[i].family) {
217
218 #if (NGX_HAVE_INET6)
219 case AF_INET6:
220 sin6 = (struct sockaddr_in6 *) u.addrs[i].sockaddr;
221 cidr[i].u.in6.addr = sin6->sin6_addr;
222 ngx_memset(cidr[i].u.in6.mask.s6_addr, 0xff, 16);
223 break;
224 #endif
225
226 default: /* AF_INET */
227 sin = (struct sockaddr_in *) u.addrs[i].sockaddr;
228 cidr[i].u.in.addr = sin->sin_addr.s_addr;
229 cidr[i].u.in.mask = 0xffffffff;
230 break;
231 }
232 }
233
234 return NGX_CONF_OK;
235 }
236
237
238 static void *
239 ngx_mail_realip_create_srv_conf(ngx_conf_t *cf)
240 {
241 ngx_mail_realip_srv_conf_t *conf;
242
243 conf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_realip_srv_conf_t));
244 if (conf == NULL) {
245 return NULL;
246 }
247
248 /*
249 * set by ngx_pcalloc():
250 *
251 * conf->from = NULL;
252 */
253
254 return conf;
255 }
256
257
258 static char *
259 ngx_mail_realip_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
260 {
261 ngx_mail_realip_srv_conf_t *prev = parent;
262 ngx_mail_realip_srv_conf_t *conf = child;
263
264 if (conf->from == NULL) {
265 conf->from = prev->from;
266 }
267
268 return NGX_CONF_OK;
269 }