Mercurial > hg > nginx
annotate src/mail/ngx_mail_imap_module.c @ 9203:0de20f43db25
Fixed request termination with AIO and subrequests (ticket #2555).
When a request was terminated due to an error via ngx_http_terminate_request()
while an AIO operation was running in a subrequest, various issues were
observed. This happened because ngx_http_request_finalizer() was only set
in the subrequest where ngx_http_terminate_request() was called, but not
in the subrequest where the AIO operation was running. After completion
of the AIO operation normal processing of the subrequest was resumed, leading
to issues.
In particular, in case of the upstream module, termination of the request
called upstream cleanup, which closed the upstream connection. Attempts to
further work with the upstream connection after AIO operation completion
resulted in segfaults in ngx_ssl_recv(), "readv() failed (9: Bad file
descriptor) while reading upstream" errors, or socket leaks.
In ticket #2555, issues were observed with the following configuration
with cache background update (with thread writing instrumented to
introduce a delay, when a client closes the connection during an update):
location = /background-and-aio-write {
proxy_pass ...
proxy_cache one;
proxy_cache_valid 200 1s;
proxy_cache_background_update on;
proxy_cache_use_stale updating;
aio threads;
aio_write on;
limit_rate 1000;
}
Similarly, the same issue can be seen with SSI, and can be caused by
errors in subrequests, such as in the following configuration
(where "/proxy" uses AIO, and "/sleep" returns 444 after some delay,
causing request termination):
location = /ssi-active-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/proxy" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
Or the same with both AIO operation and the error in non-active subrequests
(which needs slightly different handling, see below):
location = /ssi-non-active-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/static" -->
<!--#include virtual="/proxy" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
Similarly, issues can be observed with just static files. However,
with static files potential impact is limited due to timeout safeguards
in ngx_http_writer(), and the fact that c->error is set during request
termination.
In a simple configuration with an AIO operation in the active subrequest,
such as in the following configuration, the connection is closed right
after completion of the AIO operation anyway, since ngx_http_writer()
tries to write to the connection and fails due to c->error set:
location = /ssi-active-static-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/static-aio" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
In the following configuration, with an AIO operation in a non-active
subrequest, the connection is closed only after send_timeout expires:
location = /ssi-non-active-static-boom {
ssi on;
ssi_types *;
return 200 '
<!--#include virtual="/static" -->
<!--#include virtual="/static-aio" -->
<!--#include virtual="/sleep" -->
';
limit_rate 1000;
}
Fix is to introduce r->main->terminated flag, which is to be checked
by AIO event handlers when the r->main->blocked counter is decremented.
When the flag is set, handlers are expected to wake up the connection
instead of the subrequest (which might be already cleaned up).
Additionally, now ngx_http_request_finalizer() is always set in the
active subrequest, so waking up the connection properly finalizes the
request even if termination happened in a non-active subrequest.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Tue, 30 Jan 2024 03:20:05 +0300 |
parents | dc955d274130 |
children | 4538c1ffb0f8 |
rev | line source |
---|---|
521 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
521 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_event.h> | |
1136 | 11 #include <ngx_mail.h> |
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12 #include <ngx_mail_imap_module.h> |
521 | 13 |
14 | |
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15 static void *ngx_mail_imap_create_srv_conf(ngx_conf_t *cf); |
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16 static char *ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, |
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17 void *child); |
521 | 18 |
19 | |
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20 static ngx_str_t ngx_mail_imap_default_capabilities[] = { |
527 | 21 ngx_string("IMAP4"), |
22 ngx_string("IMAP4rev1"), | |
23 ngx_string("UIDPLUS"), | |
24 ngx_null_string | |
25 }; | |
26 | |
27 | |
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28 static ngx_conf_bitmask_t ngx_mail_imap_auth_methods[] = { |
1323 | 29 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED }, |
30 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED }, | |
31 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED }, | |
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32 { ngx_string("external"), NGX_MAIL_AUTH_EXTERNAL_ENABLED }, |
1323 | 33 { ngx_null_string, 0 } |
34 }; | |
35 | |
36 | |
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37 static ngx_str_t ngx_mail_imap_auth_methods_names[] = { |
1323 | 38 ngx_string("AUTH=PLAIN"), |
39 ngx_string("AUTH=LOGIN"), | |
40 ngx_null_string, /* APOP */ | |
2309 | 41 ngx_string("AUTH=CRAM-MD5"), |
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42 ngx_string("AUTH=EXTERNAL"), |
2309 | 43 ngx_null_string /* NONE */ |
1323 | 44 }; |
45 | |
46 | |
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47 static ngx_mail_protocol_t ngx_mail_imap_protocol = { |
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48 ngx_string("imap"), |
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49 ngx_string("\x04imap"), |
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50 { 143, 993, 0, 0 }, |
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51 NGX_MAIL_IMAP_PROTOCOL, |
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52 |
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53 ngx_mail_imap_init_session, |
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54 ngx_mail_imap_init_protocol, |
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55 ngx_mail_imap_parse_command, |
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56 ngx_mail_imap_auth_state, |
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57 |
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58 ngx_string("* BAD internal server error" CRLF), |
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59 ngx_string("* BYE SSL certificate error" CRLF), |
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60 ngx_string("* BYE No required SSL certificate" CRLF) |
1136 | 61 }; |
62 | |
63 | |
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64 static ngx_command_t ngx_mail_imap_commands[] = { |
521 | 65 |
66 { ngx_string("imap_client_buffer"), | |
1136 | 67 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
521 | 68 ngx_conf_set_size_slot, |
1136 | 69 NGX_MAIL_SRV_CONF_OFFSET, |
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70 offsetof(ngx_mail_imap_srv_conf_t, client_buffer_size), |
527 | 71 NULL }, |
72 | |
73 { ngx_string("imap_capabilities"), | |
1136 | 74 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE, |
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75 ngx_mail_capabilities, |
1136 | 76 NGX_MAIL_SRV_CONF_OFFSET, |
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77 offsetof(ngx_mail_imap_srv_conf_t, capabilities), |
800 | 78 NULL }, |
79 | |
1323 | 80 { ngx_string("imap_auth"), |
81 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE, | |
82 ngx_conf_set_bitmask_slot, | |
83 NGX_MAIL_SRV_CONF_OFFSET, | |
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84 offsetof(ngx_mail_imap_srv_conf_t, auth_methods), |
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85 &ngx_mail_imap_auth_methods }, |
800 | 86 |
521 | 87 ngx_null_command |
88 }; | |
89 | |
90 | |
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91 static ngx_mail_module_t ngx_mail_imap_module_ctx = { |
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92 &ngx_mail_imap_protocol, /* protocol */ |
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93 |
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94 NULL, /* create main configuration */ |
521 | 95 NULL, /* init main configuration */ |
96 | |
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97 ngx_mail_imap_create_srv_conf, /* create server configuration */ |
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98 ngx_mail_imap_merge_srv_conf /* merge server configuration */ |
521 | 99 }; |
100 | |
101 | |
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102 ngx_module_t ngx_mail_imap_module = { |
521 | 103 NGX_MODULE_V1, |
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104 &ngx_mail_imap_module_ctx, /* module context */ |
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105 ngx_mail_imap_commands, /* module directives */ |
1136 | 106 NGX_MAIL_MODULE, /* module type */ |
541 | 107 NULL, /* init master */ |
521 | 108 NULL, /* init module */ |
541 | 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 | |
521 | 115 }; |
116 | |
117 | |
118 static void * | |
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119 ngx_mail_imap_create_srv_conf(ngx_conf_t *cf) |
577 | 120 { |
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121 ngx_mail_imap_srv_conf_t *iscf; |
641 | 122 |
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123 iscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_imap_srv_conf_t)); |
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124 if (iscf == NULL) { |
527 | 125 return NULL; |
521 | 126 } |
127 | |
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128 iscf->client_buffer_size = NGX_CONF_UNSET_SIZE; |
521 | 129 |
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130 if (ngx_array_init(&iscf->capabilities, cf->pool, 4, sizeof(ngx_str_t)) |
1136 | 131 != NGX_OK) |
132 { | |
133 return NULL; | |
134 } | |
135 | |
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136 return iscf; |
521 | 137 } |
138 | |
139 | |
140 static char * | |
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141 ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) |
521 | 142 { |
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143 ngx_mail_imap_srv_conf_t *prev = parent; |
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144 ngx_mail_imap_srv_conf_t *conf = child; |
521 | 145 |
1322 | 146 u_char *p, *auth; |
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147 size_t size; |
527 | 148 ngx_str_t *c, *d; |
1136 | 149 ngx_uint_t i, m; |
527 | 150 |
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151 ngx_conf_merge_size_value(conf->client_buffer_size, |
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152 prev->client_buffer_size, |
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153 (size_t) ngx_pagesize); |
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154 |
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155 ngx_conf_merge_bitmask_value(conf->auth_methods, |
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156 prev->auth_methods, |
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157 (NGX_CONF_BITMASK_SET |
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158 |NGX_MAIL_AUTH_PLAIN_ENABLED)); |
1323 | 159 |
800 | 160 |
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161 if (conf->capabilities.nelts == 0) { |
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162 conf->capabilities = prev->capabilities; |
527 | 163 } |
164 | |
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165 if (conf->capabilities.nelts == 0) { |
527 | 166 |
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167 for (d = ngx_mail_imap_default_capabilities; d->len; d++) { |
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168 c = ngx_array_push(&conf->capabilities); |
527 | 169 if (c == NULL) { |
170 return NGX_CONF_ERROR; | |
171 } | |
172 | |
173 *c = *d; | |
174 } | |
175 } | |
176 | |
1136 | 177 size = sizeof("* CAPABILITY" CRLF) - 1; |
527 | 178 |
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179 c = conf->capabilities.elts; |
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180 for (i = 0; i < conf->capabilities.nelts; i++) { |
527 | 181 size += 1 + c[i].len; |
182 } | |
183 | |
1323 | 184 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
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185 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
1323 | 186 m <<= 1, i++) |
187 { | |
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188 if (m & conf->auth_methods) { |
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189 size += 1 + ngx_mail_imap_auth_methods_names[i].len; |
1323 | 190 } |
191 } | |
192 | |
2049 | 193 p = ngx_pnalloc(cf->pool, size); |
583 | 194 if (p == NULL) { |
195 return NGX_CONF_ERROR; | |
196 } | |
197 | |
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198 conf->capability.len = size; |
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199 conf->capability.data = p; |
583 | 200 |
201 p = ngx_cpymem(p, "* CAPABILITY", sizeof("* CAPABILITY") - 1); | |
202 | |
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203 for (i = 0; i < conf->capabilities.nelts; i++) { |
583 | 204 *p++ = ' '; |
205 p = ngx_cpymem(p, c[i].data, c[i].len); | |
206 } | |
207 | |
1323 | 208 auth = p; |
209 | |
210 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; | |
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211 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
1323 | 212 m <<= 1, i++) |
213 { | |
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214 if (m & conf->auth_methods) { |
1323 | 215 *p++ = ' '; |
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216 p = ngx_cpymem(p, ngx_mail_imap_auth_methods_names[i].data, |
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217 ngx_mail_imap_auth_methods_names[i].len); |
1323 | 218 } |
219 } | |
220 | |
583 | 221 *p++ = CR; *p = LF; |
222 | |
223 | |
224 size += sizeof(" STARTTLS") - 1; | |
225 | |
2049 | 226 p = ngx_pnalloc(cf->pool, size); |
583 | 227 if (p == NULL) { |
527 | 228 return NGX_CONF_ERROR; |
229 } | |
230 | |
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231 conf->starttls_capability.len = size; |
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232 conf->starttls_capability.data = p; |
527 | 233 |
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234 p = ngx_cpymem(p, conf->capability.data, |
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235 conf->capability.len - (sizeof(CRLF) - 1)); |
583 | 236 p = ngx_cpymem(p, " STARTTLS", sizeof(" STARTTLS") - 1); |
237 *p++ = CR; *p = LF; | |
238 | |
239 | |
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240 size = (auth - conf->capability.data) + sizeof(CRLF) - 1 |
1323 | 241 + sizeof(" STARTTLS LOGINDISABLED") - 1; |
583 | 242 |
2049 | 243 p = ngx_pnalloc(cf->pool, size); |
583 | 244 if (p == NULL) { |
245 return NGX_CONF_ERROR; | |
527 | 246 } |
247 | |
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248 conf->starttls_only_capability.len = size; |
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249 conf->starttls_only_capability.data = p; |
527 | 250 |
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251 p = ngx_cpymem(p, conf->capability.data, |
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252 auth - conf->capability.data); |
1323 | 253 p = ngx_cpymem(p, " STARTTLS LOGINDISABLED", |
254 sizeof(" STARTTLS LOGINDISABLED") - 1); | |
583 | 255 *p++ = CR; *p = LF; |
256 | |
521 | 257 return NGX_CONF_OK; |
258 } |