Mercurial > hg > nginx
annotate src/http/modules/ngx_http_empty_gif_module.c @ 7732:59e1c73fe02b
SSL: ssl_reject_handshake directive (ticket #195).
In some cases it might be needed to reject SSL handshake based on SNI
server name provided, for example, to make sure an invalid certificate
is not returned to clients trying to contact a name-based virtual server
without SSL configured. Previously, a "ssl_ciphers aNULL;" was used for
this. This workaround, however, is not compatible with TLSv1.3, in
particular, when using BoringSSL, where it is not possible to configure
TLSv1.3 ciphers at all.
With this change, the ssl_reject_handshake directive is introduced,
which instructs nginx to reject SSL handshakes with an "unrecognized_name"
alert in a particular server block.
For example, to reject handshake with names other than example.com,
one can use the following configuration:
server {
listen 443 ssl;
ssl_reject_handshake on;
}
server {
listen 443 ssl;
server_name example.com;
ssl_certificate example.com.crt;
ssl_certificate_key example.com.key;
}
The following configuration can be used to reject all SSL handshakes
without SNI server name provided:
server {
listen 443 ssl;
ssl_reject_handshake on;
}
server {
listen 443 ssl;
server_name ~^;
ssl_certificate example.crt;
ssl_certificate_key example.key;
}
Additionally, the ssl_reject_handshake directive makes configuring
certificates for the default server block optional. If no certificates
are configured in the default server for a given listening socket,
certificates must be defined in all non-default server blocks with
the listening socket in question.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Thu, 22 Oct 2020 18:02:28 +0300 |
parents | d620f497c50f |
children |
rev | line source |
---|---|
577 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
577 | 5 */ |
6 | |
7 #include <ngx_config.h> | |
8 #include <ngx_core.h> | |
9 #include <ngx_http.h> | |
10 | |
11 | |
12 static char *ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, | |
13 void *conf); | |
14 | |
15 static ngx_command_t ngx_http_empty_gif_commands[] = { | |
16 | |
17 { ngx_string("empty_gif"), | |
18 NGX_HTTP_LOC_CONF|NGX_CONF_NOARGS, | |
19 ngx_http_empty_gif, | |
20 0, | |
21 0, | |
22 NULL }, | |
23 | |
24 ngx_null_command | |
25 }; | |
26 | |
27 | |
28 /* the minimal single pixel transparent GIF, 43 bytes */ | |
29 | |
30 static u_char ngx_empty_gif[] = { | |
31 | |
581 | 32 'G', 'I', 'F', '8', '9', 'a', /* header */ |
577 | 33 |
581 | 34 /* logical screen descriptor */ |
35 0x01, 0x00, /* logical screen width */ | |
36 0x01, 0x00, /* logical screen height */ | |
37 0x80, /* global 1-bit color table */ | |
38 0x01, /* background color #1 */ | |
39 0x00, /* no aspect ratio */ | |
577 | 40 |
581 | 41 /* global color table */ |
42 0x00, 0x00, 0x00, /* #0: black */ | |
43 0xff, 0xff, 0xff, /* #1: white */ | |
577 | 44 |
581 | 45 /* graphic control extension */ |
46 0x21, /* extension introducer */ | |
47 0xf9, /* graphic control label */ | |
48 0x04, /* block size */ | |
49 0x01, /* transparent color is given, */ | |
50 /* no disposal specified, */ | |
51 /* user input is not expected */ | |
52 0x00, 0x00, /* delay time */ | |
53 0x01, /* transparent color #1 */ | |
54 0x00, /* block terminator */ | |
577 | 55 |
581 | 56 /* image descriptor */ |
57 0x2c, /* image separator */ | |
58 0x00, 0x00, /* image left position */ | |
59 0x00, 0x00, /* image top position */ | |
60 0x01, 0x00, /* image width */ | |
61 0x01, 0x00, /* image height */ | |
62 0x00, /* no local color table, no interlaced */ | |
577 | 63 |
581 | 64 /* table based image data */ |
65 0x02, /* LZW minimum code size, */ | |
66 /* must be at least 2-bit */ | |
67 0x02, /* block size */ | |
577 | 68 0x4c, 0x01, /* compressed bytes 01_001_100, 0000000_1 */ |
581 | 69 /* 100: clear code */ |
70 /* 001: 1 */ | |
71 /* 101: end of information code */ | |
72 0x00, /* block terminator */ | |
577 | 73 |
581 | 74 0x3B /* trailer */ |
577 | 75 }; |
76 | |
77 | |
667 | 78 static ngx_http_module_t ngx_http_empty_gif_module_ctx = { |
577 | 79 NULL, /* preconfiguration */ |
80 NULL, /* postconfiguration */ | |
81 | |
82 NULL, /* create main configuration */ | |
83 NULL, /* init main configuration */ | |
84 | |
85 NULL, /* create server configuration */ | |
86 NULL, /* merge server configuration */ | |
87 | |
88 NULL, /* create location configuration */ | |
89 NULL /* merge location configuration */ | |
90 }; | |
91 | |
92 | |
93 ngx_module_t ngx_http_empty_gif_module = { | |
94 NGX_MODULE_V1, | |
95 &ngx_http_empty_gif_module_ctx, /* module context */ | |
96 ngx_http_empty_gif_commands, /* module directives */ | |
97 NGX_HTTP_MODULE, /* module type */ | |
98 NULL, /* init master */ | |
99 NULL, /* init module */ | |
100 NULL, /* init process */ | |
101 NULL, /* init thread */ | |
102 NULL, /* exit thread */ | |
103 NULL, /* exit process */ | |
104 NULL, /* exit master */ | |
105 NGX_MODULE_V1_PADDING | |
106 }; | |
107 | |
108 | |
3635
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
|
109 static ngx_str_t ngx_http_gif_type = ngx_string("image/gif"); |
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
|
110 |
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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111 |
577 | 112 static ngx_int_t |
113 ngx_http_empty_gif_handler(ngx_http_request_t *r) | |
114 { | |
3635
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use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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115 ngx_http_complex_value_t cv; |
577 | 116 |
645 | 117 if (!(r->method & (NGX_HTTP_GET|NGX_HTTP_HEAD))) { |
577 | 118 return NGX_HTTP_NOT_ALLOWED; |
119 } | |
120 | |
3635
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use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
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121 ngx_memzero(&cv, sizeof(ngx_http_complex_value_t)); |
577 | 122 |
3635
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use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
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changeset
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123 cv.value.len = sizeof(ngx_empty_gif); |
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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124 cv.value.data = ngx_empty_gif; |
577 | 125 r->headers_out.last_modified_time = 23349600; |
126 | |
3635
c0113b6648de
use ngx_http_send_response() in empty_gif
Igor Sysoev <igor@sysoev.ru>
parents:
3516
diff
changeset
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127 return ngx_http_send_response(r, NGX_HTTP_OK, &ngx_http_gif_type, &cv); |
577 | 128 } |
129 | |
130 | |
131 static char * | |
132 ngx_http_empty_gif(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
133 { | |
134 ngx_http_core_loc_conf_t *clcf; | |
135 | |
136 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module); | |
137 clcf->handler = ngx_http_empty_gif_handler; | |
138 | |
139 return NGX_CONF_OK; | |
140 } |