Mercurial > hg > nginx-quic
annotate src/http/ngx_http_upstream.h @ 6359:dac6eda40475 stable-1.8
Resolver: fixed use-after-free memory accesses with CNAME.
When several requests were waiting for a response, then after getting
a CNAME response only the last request's context had the name updated.
Contexts of other requests had the wrong name. This name was used by
ngx_resolve_name_done() to find the node to remove the request context
from. When the name was wrong, the request could not be properly
cancelled, its context was freed but stayed linked to the node's waiting
list. This happened e.g. when the first request was aborted or timed
out before the resolving completed. When it completed, this triggered
a use-after-free memory access by calling ctx->handler of already freed
request context. The bug manifests itself by
"could not cancel <name> resolving" alerts in error_log.
When a request was responded with a CNAME, the request context kept
the pointer to the original node's rn->u.cname. If the original node
expired before the resolving timed out or completed with an error,
this would trigger a use-after-free memory access via ctx->name in
ctx->handler().
The fix is to keep ctx->name unmodified. The name from context
is no longer used by ngx_resolve_name_done(). Instead, we now keep
the pointer to resolver node to which this request is linked.
Keeping the original name intact also improves logging.
author | Roman Arutyunyan <arut@nginx.com> |
---|---|
date | Tue, 26 Jan 2016 16:46:59 +0300 |
parents | a08fad30aeac |
children | 79ddb0bdb273 |
rev | line source |
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479 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
479 | 5 */ |
6 | |
7 | |
8 #ifndef _NGX_HTTP_UPSTREAM_H_INCLUDED_ | |
9 #define _NGX_HTTP_UPSTREAM_H_INCLUDED_ | |
10 | |
11 | |
12 #include <ngx_config.h> | |
13 #include <ngx_core.h> | |
14 #include <ngx_event.h> | |
15 #include <ngx_event_connect.h> | |
16 #include <ngx_event_pipe.h> | |
17 #include <ngx_http.h> | |
18 | |
19 | |
665 | 20 #define NGX_HTTP_UPSTREAM_FT_ERROR 0x00000002 |
21 #define NGX_HTTP_UPSTREAM_FT_TIMEOUT 0x00000004 | |
22 #define NGX_HTTP_UPSTREAM_FT_INVALID_HEADER 0x00000008 | |
23 #define NGX_HTTP_UPSTREAM_FT_HTTP_500 0x00000010 | |
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24 #define NGX_HTTP_UPSTREAM_FT_HTTP_502 0x00000020 |
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25 #define NGX_HTTP_UPSTREAM_FT_HTTP_503 0x00000040 |
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26 #define NGX_HTTP_UPSTREAM_FT_HTTP_504 0x00000080 |
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27 #define NGX_HTTP_UPSTREAM_FT_HTTP_403 0x00000100 |
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28 #define NGX_HTTP_UPSTREAM_FT_HTTP_404 0x00000200 |
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29 #define NGX_HTTP_UPSTREAM_FT_UPDATING 0x00000400 |
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30 #define NGX_HTTP_UPSTREAM_FT_BUSY_LOCK 0x00000800 |
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31 #define NGX_HTTP_UPSTREAM_FT_MAX_WAITING 0x00001000 |
1378 | 32 #define NGX_HTTP_UPSTREAM_FT_NOLIVE 0x40000000 |
665 | 33 #define NGX_HTTP_UPSTREAM_FT_OFF 0x80000000 |
479 | 34 |
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35 #define NGX_HTTP_UPSTREAM_FT_STATUS (NGX_HTTP_UPSTREAM_FT_HTTP_500 \ |
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36 |NGX_HTTP_UPSTREAM_FT_HTTP_502 \ |
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37 |NGX_HTTP_UPSTREAM_FT_HTTP_503 \ |
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38 |NGX_HTTP_UPSTREAM_FT_HTTP_504 \ |
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39 |NGX_HTTP_UPSTREAM_FT_HTTP_403 \ |
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40 |NGX_HTTP_UPSTREAM_FT_HTTP_404) |
479 | 41 |
42 #define NGX_HTTP_UPSTREAM_INVALID_HEADER 40 | |
43 | |
44 | |
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45 #define NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT 0x00000002 |
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46 #define NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES 0x00000004 |
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47 #define NGX_HTTP_UPSTREAM_IGN_EXPIRES 0x00000008 |
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48 #define NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL 0x00000010 |
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49 #define NGX_HTTP_UPSTREAM_IGN_SET_COOKIE 0x00000020 |
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50 #define NGX_HTTP_UPSTREAM_IGN_XA_LIMIT_RATE 0x00000040 |
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51 #define NGX_HTTP_UPSTREAM_IGN_XA_BUFFERING 0x00000080 |
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52 #define NGX_HTTP_UPSTREAM_IGN_XA_CHARSET 0x00000100 |
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53 #define NGX_HTTP_UPSTREAM_IGN_VARY 0x00000200 |
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54 |
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55 |
479 | 56 typedef struct { |
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57 ngx_msec_t bl_time; |
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58 ngx_uint_t bl_state; |
479 | 59 |
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60 ngx_uint_t status; |
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61 time_t response_sec; |
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62 ngx_uint_t response_msec; |
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63 time_t header_sec; |
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64 ngx_uint_t header_msec; |
3795 | 65 off_t response_length; |
563 | 66 |
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67 ngx_str_t *peer; |
479 | 68 } ngx_http_upstream_state_t; |
69 | |
70 | |
71 typedef struct { | |
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72 ngx_hash_t headers_in_hash; |
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73 ngx_array_t upstreams; |
884 | 74 /* ngx_http_upstream_srv_conf_t */ |
509 | 75 } ngx_http_upstream_main_conf_t; |
76 | |
884 | 77 typedef struct ngx_http_upstream_srv_conf_s ngx_http_upstream_srv_conf_t; |
78 | |
79 typedef ngx_int_t (*ngx_http_upstream_init_pt)(ngx_conf_t *cf, | |
80 ngx_http_upstream_srv_conf_t *us); | |
81 typedef ngx_int_t (*ngx_http_upstream_init_peer_pt)(ngx_http_request_t *r, | |
82 ngx_http_upstream_srv_conf_t *us); | |
83 | |
84 | |
85 typedef struct { | |
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86 ngx_http_upstream_init_pt init_upstream; |
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87 ngx_http_upstream_init_peer_pt init; |
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88 void *data; |
884 | 89 } ngx_http_upstream_peer_t; |
90 | |
509 | 91 |
92 typedef struct { | |
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93 ngx_str_t name; |
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94 ngx_addr_t *addrs; |
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95 ngx_uint_t naddrs; |
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96 ngx_uint_t weight; |
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97 ngx_uint_t max_fails; |
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98 time_t fail_timeout; |
884 | 99 |
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100 unsigned down:1; |
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101 unsigned backup:1; |
884 | 102 } ngx_http_upstream_server_t; |
103 | |
651 | 104 |
884 | 105 #define NGX_HTTP_UPSTREAM_CREATE 0x0001 |
106 #define NGX_HTTP_UPSTREAM_WEIGHT 0x0002 | |
107 #define NGX_HTTP_UPSTREAM_MAX_FAILS 0x0004 | |
108 #define NGX_HTTP_UPSTREAM_FAIL_TIMEOUT 0x0008 | |
109 #define NGX_HTTP_UPSTREAM_DOWN 0x0010 | |
110 #define NGX_HTTP_UPSTREAM_BACKUP 0x0020 | |
111 | |
651 | 112 |
884 | 113 struct ngx_http_upstream_srv_conf_s { |
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114 ngx_http_upstream_peer_t peer; |
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115 void **srv_conf; |
884 | 116 |
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117 ngx_array_t *servers; /* ngx_http_upstream_server_t */ |
884 | 118 |
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119 ngx_uint_t flags; |
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120 ngx_str_t host; |
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121 u_char *file_name; |
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122 ngx_uint_t line; |
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123 in_port_t port; |
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124 in_port_t default_port; |
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125 ngx_uint_t no_port; /* unsigned no_port:1 */ |
884 | 126 }; |
651 | 127 |
128 | |
129 typedef struct { | |
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130 ngx_addr_t *addr; |
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131 ngx_http_complex_value_t *value; |
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132 } ngx_http_upstream_local_t; |
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133 |
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134 |
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135 typedef struct { |
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136 ngx_http_upstream_srv_conf_t *upstream; |
884 | 137 |
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138 ngx_msec_t connect_timeout; |
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139 ngx_msec_t send_timeout; |
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140 ngx_msec_t read_timeout; |
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141 ngx_msec_t timeout; |
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142 ngx_msec_t next_upstream_timeout; |
479 | 143 |
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144 size_t send_lowat; |
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145 size_t buffer_size; |
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146 size_t limit_rate; |
529 | 147 |
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148 size_t busy_buffers_size; |
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149 size_t max_temp_file_size; |
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150 size_t temp_file_write_size; |
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151 |
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152 size_t busy_buffers_size_conf; |
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153 size_t max_temp_file_size_conf; |
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154 size_t temp_file_write_size_conf; |
509 | 155 |
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156 ngx_bufs_t bufs; |
529 | 157 |
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158 ngx_uint_t ignore_headers; |
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159 ngx_uint_t next_upstream; |
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160 ngx_uint_t store_access; |
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161 ngx_uint_t next_upstream_tries; |
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162 ngx_flag_t buffering; |
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163 ngx_flag_t request_buffering; |
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164 ngx_flag_t pass_request_headers; |
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165 ngx_flag_t pass_request_body; |
479 | 166 |
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167 ngx_flag_t ignore_client_abort; |
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168 ngx_flag_t intercept_errors; |
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169 ngx_flag_t cyclic_temp_file; |
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170 ngx_flag_t force_ranges; |
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171 |
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172 ngx_path_t *temp_path; |
479 | 173 |
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174 ngx_hash_t hide_headers_hash; |
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175 ngx_array_t *hide_headers; |
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176 ngx_array_t *pass_headers; |
509 | 177 |
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178 ngx_http_upstream_local_t *local; |
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179 |
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180 #if (NGX_HTTP_CACHE) |
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181 ngx_shm_zone_t *cache_zone; |
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182 ngx_http_complex_value_t *cache_value; |
479 | 183 |
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184 ngx_uint_t cache_min_uses; |
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185 ngx_uint_t cache_use_stale; |
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186 ngx_uint_t cache_methods; |
479 | 187 |
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188 ngx_flag_t cache_lock; |
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189 ngx_msec_t cache_lock_timeout; |
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190 ngx_msec_t cache_lock_age; |
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191 |
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192 ngx_flag_t cache_revalidate; |
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193 |
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194 ngx_array_t *cache_valid; |
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195 ngx_array_t *cache_bypass; |
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196 ngx_array_t *no_cache; |
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197 #endif |
509 | 198 |
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199 ngx_array_t *store_lengths; |
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200 ngx_array_t *store_values; |
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201 |
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202 #if (NGX_HTTP_CACHE) |
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203 signed cache:2; |
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204 #endif |
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205 signed store:2; |
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206 unsigned intercept_404:1; |
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207 unsigned change_buffering:1; |
581 | 208 |
577 | 209 #if (NGX_HTTP_SSL) |
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210 ngx_ssl_t *ssl; |
2754 | 211 ngx_flag_t ssl_session_reuse; |
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212 |
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213 ngx_http_complex_value_t *ssl_name; |
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214 ngx_flag_t ssl_server_name; |
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215 ngx_flag_t ssl_verify; |
577 | 216 #endif |
217 | |
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218 ngx_str_t module; |
479 | 219 } ngx_http_upstream_conf_t; |
220 | |
221 | |
509 | 222 typedef struct { |
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223 ngx_str_t name; |
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224 ngx_http_header_handler_pt handler; |
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225 ngx_uint_t offset; |
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226 ngx_http_header_handler_pt copy_handler; |
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227 ngx_uint_t conf; |
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228 ngx_uint_t redirect; /* unsigned redirect:1; */ |
509 | 229 } ngx_http_upstream_header_t; |
230 | |
231 | |
232 typedef struct { | |
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233 ngx_list_t headers; |
509 | 234 |
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235 ngx_uint_t status_n; |
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236 ngx_str_t status_line; |
529 | 237 |
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238 ngx_table_elt_t *status; |
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239 ngx_table_elt_t *date; |
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240 ngx_table_elt_t *server; |
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241 ngx_table_elt_t *connection; |
509 | 242 |
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243 ngx_table_elt_t *expires; |
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244 ngx_table_elt_t *etag; |
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245 ngx_table_elt_t *x_accel_expires; |
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246 ngx_table_elt_t *x_accel_redirect; |
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247 ngx_table_elt_t *x_accel_limit_rate; |
509 | 248 |
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249 ngx_table_elt_t *content_type; |
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250 ngx_table_elt_t *content_length; |
509 | 251 |
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252 ngx_table_elt_t *last_modified; |
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253 ngx_table_elt_t *location; |
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254 ngx_table_elt_t *accept_ranges; |
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255 ngx_table_elt_t *www_authenticate; |
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256 ngx_table_elt_t *transfer_encoding; |
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257 ngx_table_elt_t *vary; |
509 | 258 |
259 #if (NGX_HTTP_GZIP) | |
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260 ngx_table_elt_t *content_encoding; |
509 | 261 #endif |
262 | |
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263 ngx_array_t cache_control; |
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264 ngx_array_t cookies; |
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265 |
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266 off_t content_length_n; |
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267 time_t last_modified_time; |
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268 |
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269 unsigned connection_close:1; |
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270 unsigned chunked:1; |
509 | 271 } ngx_http_upstream_headers_in_t; |
272 | |
479 | 273 |
1658 | 274 typedef struct { |
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275 ngx_str_t host; |
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276 in_port_t port; |
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277 ngx_uint_t no_port; /* unsigned no_port:1 */ |
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278 |
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279 ngx_uint_t naddrs; |
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280 ngx_addr_t *addrs; |
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281 |
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282 struct sockaddr *sockaddr; |
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283 socklen_t socklen; |
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284 |
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285 ngx_resolver_ctx_t *ctx; |
1658 | 286 } ngx_http_upstream_resolved_t; |
287 | |
288 | |
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289 typedef void (*ngx_http_upstream_handler_pt)(ngx_http_request_t *r, |
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290 ngx_http_upstream_t *u); |
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291 |
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292 |
479 | 293 struct ngx_http_upstream_s { |
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294 ngx_http_upstream_handler_pt read_event_handler; |
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295 ngx_http_upstream_handler_pt write_event_handler; |
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296 |
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297 ngx_peer_connection_t peer; |
479 | 298 |
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299 ngx_event_pipe_t *pipe; |
479 | 300 |
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301 ngx_chain_t *request_bufs; |
479 | 302 |
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303 ngx_output_chain_ctx_t output; |
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304 ngx_chain_writer_ctx_t writer; |
479 | 305 |
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306 ngx_http_upstream_conf_t *conf; |
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307 #if (NGX_HTTP_CACHE) |
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308 ngx_array_t *caches; |
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309 #endif |
479 | 310 |
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311 ngx_http_upstream_headers_in_t headers_in; |
509 | 312 |
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313 ngx_http_upstream_resolved_t *resolved; |
1658 | 314 |
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315 ngx_buf_t from_client; |
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316 |
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317 ngx_buf_t buffer; |
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318 off_t length; |
581 | 319 |
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320 ngx_chain_t *out_bufs; |
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321 ngx_chain_t *busy_bufs; |
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322 ngx_chain_t *free_bufs; |
581 | 323 |
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324 ngx_int_t (*input_filter_init)(void *data); |
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325 ngx_int_t (*input_filter)(void *data, ssize_t bytes); |
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326 void *input_filter_ctx; |
479 | 327 |
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328 #if (NGX_HTTP_CACHE) |
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329 ngx_int_t (*create_key)(ngx_http_request_t *r); |
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330 #endif |
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331 ngx_int_t (*create_request)(ngx_http_request_t *r); |
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332 ngx_int_t (*reinit_request)(ngx_http_request_t *r); |
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333 ngx_int_t (*process_header)(ngx_http_request_t *r); |
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334 void (*abort_request)(ngx_http_request_t *r); |
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335 void (*finalize_request)(ngx_http_request_t *r, |
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336 ngx_int_t rc); |
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337 ngx_int_t (*rewrite_redirect)(ngx_http_request_t *r, |
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338 ngx_table_elt_t *h, size_t prefix); |
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339 ngx_int_t (*rewrite_cookie)(ngx_http_request_t *r, |
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340 ngx_table_elt_t *h); |
479 | 341 |
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342 ngx_msec_t timeout; |
527 | 343 |
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344 ngx_http_upstream_state_t *state; |
479 | 345 |
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346 ngx_str_t method; |
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347 ngx_str_t schema; |
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348 ngx_str_t uri; |
555 | 349 |
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350 #if (NGX_HTTP_SSL) |
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351 ngx_str_t ssl_name; |
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352 #endif |
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353 |
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354 ngx_http_cleanup_pt *cleanup; |
569 | 355 |
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356 unsigned store:1; |
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357 unsigned cacheable:1; |
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358 unsigned accel:1; |
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359 unsigned ssl:1; |
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360 #if (NGX_HTTP_CACHE) |
2952 | 361 unsigned cache_status:3; |
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362 #endif |
479 | 363 |
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364 unsigned buffering:1; |
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365 unsigned keepalive:1; |
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366 unsigned upgrade:1; |
649 | 367 |
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368 unsigned request_sent:1; |
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369 unsigned header_sent:1; |
479 | 370 }; |
371 | |
372 | |
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373 typedef struct { |
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374 ngx_uint_t status; |
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375 ngx_uint_t mask; |
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376 } ngx_http_upstream_next_t; |
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377 |
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378 |
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379 typedef struct { |
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380 ngx_str_t key; |
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381 ngx_str_t value; |
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382 ngx_uint_t skip_empty; |
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383 } ngx_http_upstream_param_t; |
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384 |
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385 |
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386 ngx_int_t ngx_http_upstream_cookie_variable(ngx_http_request_t *r, |
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387 ngx_http_variable_value_t *v, uintptr_t data); |
1162 | 388 ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r, |
389 ngx_http_variable_value_t *v, uintptr_t data); | |
390 | |
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391 ngx_int_t ngx_http_upstream_create(ngx_http_request_t *r); |
479 | 392 void ngx_http_upstream_init(ngx_http_request_t *r); |
651 | 393 ngx_http_upstream_srv_conf_t *ngx_http_upstream_add(ngx_conf_t *cf, |
884 | 394 ngx_url_t *u, ngx_uint_t flags); |
3399 | 395 char *ngx_http_upstream_bind_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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396 void *conf); |
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397 char *ngx_http_upstream_param_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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398 void *conf); |
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399 ngx_int_t ngx_http_upstream_hide_headers_hash(ngx_conf_t *cf, |
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400 ngx_http_upstream_conf_t *conf, ngx_http_upstream_conf_t *prev, |
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401 ngx_str_t *default_hide_headers, ngx_hash_init_t *hash); |
884 | 402 |
403 | |
404 #define ngx_http_conf_upstream_srv_conf(uscf, module) \ | |
405 uscf->srv_conf[module.ctx_index] | |
509 | 406 |
479 | 407 |
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408 extern ngx_module_t ngx_http_upstream_module; |
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409 extern ngx_conf_bitmask_t ngx_http_upstream_cache_method_mask[]; |
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410 extern ngx_conf_bitmask_t ngx_http_upstream_ignore_headers_masks[]; |
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411 |
479 | 412 |
413 #endif /* _NGX_HTTP_UPSTREAM_H_INCLUDED_ */ |