Mercurial > hg > nginx-quic
annotate src/mail/ngx_mail_smtp_module.c @ 6982:ac9b1df5b246
SSL: disabled renegotiation detection in client mode.
CVE-2009-3555 is no longer relevant and mitigated by the renegotiation
info extension (secure renegotiation). On the other hand, unexpected
renegotiation still introduces potential security risks, and hence we do
not allow renegotiation on the server side, as we never request renegotiation.
On the client side the situation is different though. There are backends
which explicitly request renegotiation, and disabled renegotiation
introduces interoperability problems. This change allows renegotiation
on the client side, and fixes interoperability problems as observed with
such backends (ticket #872).
Additionally, with TLSv1.3 the SSL_CB_HANDSHAKE_START flag is currently set
by OpenSSL when receiving a NewSessionTicket message, and was detected by
nginx as a renegotiation attempt. This looks like a bug in OpenSSL, though
this change also allows better interoperability till the problem is fixed.
author | Sergey Kandaurov <pluknet@nginx.com> |
---|---|
date | Tue, 18 Apr 2017 16:08:44 +0300 |
parents | f18c285c2e59 |
children | dc955d274130 |
rev | line source |
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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_smtp_module.h> |
521 | 13 |
14 | |
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15 static void *ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf); |
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16 static char *ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, |
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17 void *child); |
527 | 18 |
19 | |
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20 static ngx_conf_bitmask_t ngx_mail_smtp_auth_methods[] = { |
1323 | 21 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED }, |
22 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED }, | |
23 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED }, | |
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24 { ngx_string("external"), NGX_MAIL_AUTH_EXTERNAL_ENABLED }, |
2309 | 25 { ngx_string("none"), NGX_MAIL_AUTH_NONE_ENABLED }, |
1323 | 26 { ngx_null_string, 0 } |
27 }; | |
28 | |
29 | |
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30 static ngx_str_t ngx_mail_smtp_auth_methods_names[] = { |
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31 ngx_string("PLAIN"), |
1136 | 32 ngx_string("LOGIN"), |
33 ngx_null_string, /* APOP */ | |
2309 | 34 ngx_string("CRAM-MD5"), |
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35 ngx_string("EXTERNAL"), |
2309 | 36 ngx_null_string /* NONE */ |
1136 | 37 }; |
38 | |
39 | |
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40 static ngx_mail_protocol_t ngx_mail_smtp_protocol = { |
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41 ngx_string("smtp"), |
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42 { 25, 465, 587, 0 }, |
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43 NGX_MAIL_SMTP_PROTOCOL, |
809 | 44 |
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45 ngx_mail_smtp_init_session, |
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46 ngx_mail_smtp_init_protocol, |
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47 ngx_mail_smtp_parse_command, |
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48 ngx_mail_smtp_auth_state, |
809 | 49 |
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50 ngx_string("451 4.3.2 Internal server error" CRLF), |
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51 ngx_string("421 4.7.1 SSL certificate error" CRLF), |
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52 ngx_string("421 4.7.1 No required SSL certificate" CRLF) |
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53 }; |
809 | 54 |
55 | |
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56 static ngx_command_t ngx_mail_smtp_commands[] = { |
521 | 57 |
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58 { ngx_string("smtp_client_buffer"), |
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59 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
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60 ngx_conf_set_size_slot, |
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61 NGX_MAIL_SRV_CONF_OFFSET, |
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62 offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size), |
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63 NULL }, |
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64 |
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65 { ngx_string("smtp_greeting_delay"), |
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66 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
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67 ngx_conf_set_msec_slot, |
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68 NGX_MAIL_SRV_CONF_OFFSET, |
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69 offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay), |
1136 | 70 NULL }, |
71 | |
72 { ngx_string("smtp_capabilities"), | |
73 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE, | |
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74 ngx_mail_capabilities, |
1136 | 75 NGX_MAIL_SRV_CONF_OFFSET, |
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76 offsetof(ngx_mail_smtp_srv_conf_t, capabilities), |
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77 NULL }, |
1323 | 78 |
1136 | 79 { ngx_string("smtp_auth"), |
80 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE, | |
81 ngx_conf_set_bitmask_slot, | |
82 NGX_MAIL_SRV_CONF_OFFSET, | |
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83 offsetof(ngx_mail_smtp_srv_conf_t, auth_methods), |
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84 &ngx_mail_smtp_auth_methods }, |
800 | 85 |
521 | 86 ngx_null_command |
87 }; | |
88 | |
89 | |
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90 static ngx_mail_module_t ngx_mail_smtp_module_ctx = { |
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91 &ngx_mail_smtp_protocol, /* protocol */ |
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92 |
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93 NULL, /* create main configuration */ |
521 | 94 NULL, /* init main configuration */ |
95 | |
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96 ngx_mail_smtp_create_srv_conf, /* create server configuration */ |
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97 ngx_mail_smtp_merge_srv_conf /* merge server configuration */ |
521 | 98 }; |
99 | |
100 | |
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101 ngx_module_t ngx_mail_smtp_module = { |
521 | 102 NGX_MODULE_V1, |
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103 &ngx_mail_smtp_module_ctx, /* module context */ |
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104 ngx_mail_smtp_commands, /* module directives */ |
1136 | 105 NGX_MAIL_MODULE, /* module type */ |
541 | 106 NULL, /* init master */ |
521 | 107 NULL, /* init module */ |
541 | 108 NULL, /* init process */ |
109 NULL, /* init thread */ | |
110 NULL, /* exit thread */ | |
111 NULL, /* exit process */ | |
112 NULL, /* exit master */ | |
113 NGX_MODULE_V1_PADDING | |
521 | 114 }; |
115 | |
116 | |
117 static void * | |
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118 ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf) |
577 | 119 { |
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120 ngx_mail_smtp_srv_conf_t *sscf; |
641 | 121 |
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122 sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t)); |
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123 if (sscf == NULL) { |
527 | 124 return NULL; |
521 | 125 } |
126 | |
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127 sscf->client_buffer_size = NGX_CONF_UNSET_SIZE; |
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128 sscf->greeting_delay = NGX_CONF_UNSET_MSEC; |
521 | 129 |
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130 if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t)) |
1136 | 131 != NGX_OK) |
132 { | |
133 return NULL; | |
134 } | |
135 | |
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136 return sscf; |
521 | 137 } |
138 | |
139 | |
140 static char * | |
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141 ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) |
521 | 142 { |
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143 ngx_mail_smtp_srv_conf_t *prev = parent; |
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144 ngx_mail_smtp_srv_conf_t *conf = child; |
521 | 145 |
2309 | 146 u_char *p, *auth, *last; |
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147 size_t size; |
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148 ngx_str_t *c; |
2309 | 149 ngx_uint_t i, m, auth_enabled; |
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150 ngx_mail_core_srv_conf_t *cscf; |
527 | 151 |
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152 ngx_conf_merge_size_value(conf->client_buffer_size, |
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153 prev->client_buffer_size, |
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154 (size_t) ngx_pagesize); |
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155 |
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156 ngx_conf_merge_msec_value(conf->greeting_delay, |
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157 prev->greeting_delay, 0); |
521 | 158 |
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159 ngx_conf_merge_bitmask_value(conf->auth_methods, |
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160 prev->auth_methods, |
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161 (NGX_CONF_BITMASK_SET |
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162 |NGX_MAIL_AUTH_PLAIN_ENABLED |
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163 |NGX_MAIL_AUTH_LOGIN_ENABLED)); |
800 | 164 |
165 | |
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166 cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module); |
527 | 167 |
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168 size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len; |
809 | 169 |
2049 | 170 p = ngx_pnalloc(cf->pool, size); |
583 | 171 if (p == NULL) { |
527 | 172 return NGX_CONF_ERROR; |
173 } | |
174 | |
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175 conf->greeting.len = size; |
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176 conf->greeting.data = p; |
527 | 177 |
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178 *p++ = '2'; *p++ = '2'; *p++ = '0'; *p++ = ' '; |
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179 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
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180 ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1); |
583 | 181 |
182 | |
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183 size = sizeof("250 " CRLF) - 1 + cscf->server_name.len; |
527 | 184 |
2049 | 185 p = ngx_pnalloc(cf->pool, size); |
583 | 186 if (p == NULL) { |
187 return NGX_CONF_ERROR; | |
188 } | |
189 | |
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190 conf->server_name.len = size; |
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191 conf->server_name.data = p; |
583 | 192 |
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193 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' '; |
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194 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
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195 *p++ = CR; *p = LF; |
527 | 196 |
197 | |
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198 if (conf->capabilities.nelts == 0) { |
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199 conf->capabilities = prev->capabilities; |
1136 | 200 } |
201 | |
2309 | 202 size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1; |
1136 | 203 |
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204 c = conf->capabilities.elts; |
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205 for (i = 0; i < conf->capabilities.nelts; i++) { |
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206 size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1; |
527 | 207 } |
208 | |
2309 | 209 auth_enabled = 0; |
210 | |
1323 | 211 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
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212 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
1323 | 213 m <<= 1, i++) |
214 { | |
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215 if (m & conf->auth_methods) { |
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216 size += 1 + ngx_mail_smtp_auth_methods_names[i].len; |
2309 | 217 auth_enabled = 1; |
1323 | 218 } |
219 } | |
220 | |
2309 | 221 if (auth_enabled) { |
222 size += sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1; | |
223 } | |
224 | |
2049 | 225 p = ngx_pnalloc(cf->pool, size); |
583 | 226 if (p == NULL) { |
227 return NGX_CONF_ERROR; | |
228 } | |
229 | |
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230 conf->capability.len = size; |
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231 conf->capability.data = p; |
1136 | 232 |
2309 | 233 last = p; |
234 | |
1136 | 235 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-'; |
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236 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
1136 | 237 *p++ = CR; *p++ = LF; |
238 | |
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239 for (i = 0; i < conf->capabilities.nelts; i++) { |
2309 | 240 last = p; |
1136 | 241 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-'; |
242 p = ngx_cpymem(p, c[i].data, c[i].len); | |
243 *p++ = CR; *p++ = LF; | |
244 } | |
245 | |
1322 | 246 auth = p; |
247 | |
2309 | 248 if (auth_enabled) { |
249 last = p; | |
250 | |
251 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' '; | |
252 *p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H'; | |
1136 | 253 |
2309 | 254 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
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255 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
2309 | 256 m <<= 1, i++) |
257 { | |
258 if (m & conf->auth_methods) { | |
259 *p++ = ' '; | |
260 p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data, | |
261 ngx_mail_smtp_auth_methods_names[i].len); | |
262 } | |
1136 | 263 } |
2309 | 264 |
265 *p++ = CR; *p = LF; | |
1136 | 266 |
2309 | 267 } else { |
268 last[3] = ' '; | |
269 } | |
1136 | 270 |
1322 | 271 size += sizeof("250 STARTTLS" CRLF) - 1; |
272 | |
2049 | 273 p = ngx_pnalloc(cf->pool, size); |
1322 | 274 if (p == NULL) { |
275 return NGX_CONF_ERROR; | |
276 } | |
277 | |
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278 conf->starttls_capability.len = size; |
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279 conf->starttls_capability.data = p; |
1322 | 280 |
2309 | 281 p = ngx_cpymem(p, conf->capability.data, conf->capability.len); |
1322 | 282 |
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283 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1); |
1322 | 284 |
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285 p = conf->starttls_capability.data |
2309 | 286 + (last - conf->capability.data) + 3; |
1322 | 287 *p = '-'; |
288 | |
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289 size = (auth - conf->capability.data) |
1322 | 290 + sizeof("250 STARTTLS" CRLF) - 1; |
291 | |
2049 | 292 p = ngx_pnalloc(cf->pool, size); |
1322 | 293 if (p == NULL) { |
294 return NGX_CONF_ERROR; | |
295 } | |
296 | |
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297 conf->starttls_only_capability.len = size; |
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298 conf->starttls_only_capability.data = p; |
1322 | 299 |
2309 | 300 p = ngx_cpymem(p, conf->capability.data, auth - conf->capability.data); |
1322 | 301 |
302 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1); | |
303 | |
2309 | 304 if (last < auth) { |
305 p = conf->starttls_only_capability.data | |
306 + (last - conf->capability.data) + 3; | |
307 *p = '-'; | |
308 } | |
309 | |
521 | 310 return NGX_CONF_OK; |
311 } |