Mercurial > hg > nginx
annotate src/mail/ngx_mail_smtp_module.c @ 7938:dc955d274130
Mail: connections with wrong ALPN protocols are now rejected.
This is a recommended behavior by RFC 7301 and is useful
for mitigation of protocol confusion attacks [1].
For POP3 and IMAP protocols IANA-assigned ALPN IDs are used [2].
For the SMTP protocol "smtp" is used.
[1] https://alpaca-attack.com/
[2] https://www.iana.org/assignments/tls-extensiontype-values/
| author | Vladimir Homutov <vl@nginx.com> |
|---|---|
| date | Wed, 20 Oct 2021 09:45:34 +0300 |
| parents | f18c285c2e59 |
| children |
| 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_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 ngx_string("\x04smtp"), |
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43 { 25, 465, 587, 0 }, |
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44 NGX_MAIL_SMTP_PROTOCOL, |
| 809 | 45 |
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46 ngx_mail_smtp_init_session, |
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47 ngx_mail_smtp_init_protocol, |
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48 ngx_mail_smtp_parse_command, |
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49 ngx_mail_smtp_auth_state, |
| 809 | 50 |
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51 ngx_string("451 4.3.2 Internal server error" CRLF), |
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52 ngx_string("421 4.7.1 SSL certificate error" CRLF), |
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53 ngx_string("421 4.7.1 No required SSL certificate" CRLF) |
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54 }; |
| 809 | 55 |
| 56 | |
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57 static ngx_command_t ngx_mail_smtp_commands[] = { |
| 521 | 58 |
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59 { ngx_string("smtp_client_buffer"), |
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60 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
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61 ngx_conf_set_size_slot, |
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62 NGX_MAIL_SRV_CONF_OFFSET, |
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63 offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size), |
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64 NULL }, |
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65 |
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66 { ngx_string("smtp_greeting_delay"), |
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67 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
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68 ngx_conf_set_msec_slot, |
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69 NGX_MAIL_SRV_CONF_OFFSET, |
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70 offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay), |
| 1136 | 71 NULL }, |
| 72 | |
| 73 { ngx_string("smtp_capabilities"), | |
| 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_smtp_srv_conf_t, capabilities), |
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78 NULL }, |
| 1323 | 79 |
| 1136 | 80 { ngx_string("smtp_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_smtp_srv_conf_t, auth_methods), |
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85 &ngx_mail_smtp_auth_methods }, |
| 800 | 86 |
| 521 | 87 ngx_null_command |
| 88 }; | |
| 89 | |
| 90 | |
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91 static ngx_mail_module_t ngx_mail_smtp_module_ctx = { |
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92 &ngx_mail_smtp_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_smtp_create_srv_conf, /* create server configuration */ |
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98 ngx_mail_smtp_merge_srv_conf /* merge server configuration */ |
| 521 | 99 }; |
| 100 | |
| 101 | |
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102 ngx_module_t ngx_mail_smtp_module = { |
| 521 | 103 NGX_MODULE_V1, |
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104 &ngx_mail_smtp_module_ctx, /* module context */ |
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105 ngx_mail_smtp_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_smtp_create_srv_conf(ngx_conf_t *cf) |
| 577 | 120 { |
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121 ngx_mail_smtp_srv_conf_t *sscf; |
| 641 | 122 |
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123 sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t)); |
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124 if (sscf == NULL) { |
| 527 | 125 return NULL; |
| 521 | 126 } |
| 127 | |
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128 sscf->client_buffer_size = NGX_CONF_UNSET_SIZE; |
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129 sscf->greeting_delay = NGX_CONF_UNSET_MSEC; |
| 521 | 130 |
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131 if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t)) |
| 1136 | 132 != NGX_OK) |
| 133 { | |
| 134 return NULL; | |
| 135 } | |
| 136 | |
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137 return sscf; |
| 521 | 138 } |
| 139 | |
| 140 | |
| 141 static char * | |
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142 ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) |
| 521 | 143 { |
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144 ngx_mail_smtp_srv_conf_t *prev = parent; |
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145 ngx_mail_smtp_srv_conf_t *conf = child; |
| 521 | 146 |
| 2309 | 147 u_char *p, *auth, *last; |
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148 size_t size; |
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149 ngx_str_t *c; |
| 2309 | 150 ngx_uint_t i, m, auth_enabled; |
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151 ngx_mail_core_srv_conf_t *cscf; |
| 527 | 152 |
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153 ngx_conf_merge_size_value(conf->client_buffer_size, |
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154 prev->client_buffer_size, |
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155 (size_t) ngx_pagesize); |
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156 |
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157 ngx_conf_merge_msec_value(conf->greeting_delay, |
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158 prev->greeting_delay, 0); |
| 521 | 159 |
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160 ngx_conf_merge_bitmask_value(conf->auth_methods, |
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161 prev->auth_methods, |
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162 (NGX_CONF_BITMASK_SET |
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163 |NGX_MAIL_AUTH_PLAIN_ENABLED |
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164 |NGX_MAIL_AUTH_LOGIN_ENABLED)); |
| 800 | 165 |
| 166 | |
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167 cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module); |
| 527 | 168 |
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169 size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len; |
| 809 | 170 |
| 2049 | 171 p = ngx_pnalloc(cf->pool, size); |
| 583 | 172 if (p == NULL) { |
| 527 | 173 return NGX_CONF_ERROR; |
| 174 } | |
| 175 | |
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176 conf->greeting.len = size; |
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177 conf->greeting.data = p; |
| 527 | 178 |
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179 *p++ = '2'; *p++ = '2'; *p++ = '0'; *p++ = ' '; |
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180 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
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181 ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1); |
| 583 | 182 |
| 183 | |
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184 size = sizeof("250 " CRLF) - 1 + cscf->server_name.len; |
| 527 | 185 |
| 2049 | 186 p = ngx_pnalloc(cf->pool, size); |
| 583 | 187 if (p == NULL) { |
| 188 return NGX_CONF_ERROR; | |
| 189 } | |
| 190 | |
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191 conf->server_name.len = size; |
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192 conf->server_name.data = p; |
| 583 | 193 |
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194 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' '; |
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195 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
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196 *p++ = CR; *p = LF; |
| 527 | 197 |
| 198 | |
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199 if (conf->capabilities.nelts == 0) { |
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200 conf->capabilities = prev->capabilities; |
| 1136 | 201 } |
| 202 | |
| 2309 | 203 size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1; |
| 1136 | 204 |
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205 c = conf->capabilities.elts; |
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206 for (i = 0; i < conf->capabilities.nelts; i++) { |
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207 size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1; |
| 527 | 208 } |
| 209 | |
| 2309 | 210 auth_enabled = 0; |
| 211 | |
| 1323 | 212 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
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213 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
| 1323 | 214 m <<= 1, i++) |
| 215 { | |
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216 if (m & conf->auth_methods) { |
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217 size += 1 + ngx_mail_smtp_auth_methods_names[i].len; |
| 2309 | 218 auth_enabled = 1; |
| 1323 | 219 } |
| 220 } | |
| 221 | |
| 2309 | 222 if (auth_enabled) { |
| 223 size += sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1; | |
| 224 } | |
| 225 | |
| 2049 | 226 p = ngx_pnalloc(cf->pool, size); |
| 583 | 227 if (p == NULL) { |
| 228 return NGX_CONF_ERROR; | |
| 229 } | |
| 230 | |
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231 conf->capability.len = size; |
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232 conf->capability.data = p; |
| 1136 | 233 |
| 2309 | 234 last = p; |
| 235 | |
| 1136 | 236 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-'; |
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237 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
| 1136 | 238 *p++ = CR; *p++ = LF; |
| 239 | |
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240 for (i = 0; i < conf->capabilities.nelts; i++) { |
| 2309 | 241 last = p; |
| 1136 | 242 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-'; |
| 243 p = ngx_cpymem(p, c[i].data, c[i].len); | |
| 244 *p++ = CR; *p++ = LF; | |
| 245 } | |
| 246 | |
| 1322 | 247 auth = p; |
| 248 | |
| 2309 | 249 if (auth_enabled) { |
| 250 last = p; | |
| 251 | |
| 252 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' '; | |
| 253 *p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H'; | |
| 1136 | 254 |
| 2309 | 255 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
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256 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
| 2309 | 257 m <<= 1, i++) |
| 258 { | |
| 259 if (m & conf->auth_methods) { | |
| 260 *p++ = ' '; | |
| 261 p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data, | |
| 262 ngx_mail_smtp_auth_methods_names[i].len); | |
| 263 } | |
| 1136 | 264 } |
| 2309 | 265 |
| 266 *p++ = CR; *p = LF; | |
| 1136 | 267 |
| 2309 | 268 } else { |
| 269 last[3] = ' '; | |
| 270 } | |
| 1136 | 271 |
| 1322 | 272 size += sizeof("250 STARTTLS" CRLF) - 1; |
| 273 | |
| 2049 | 274 p = ngx_pnalloc(cf->pool, size); |
| 1322 | 275 if (p == NULL) { |
| 276 return NGX_CONF_ERROR; | |
| 277 } | |
| 278 | |
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279 conf->starttls_capability.len = size; |
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280 conf->starttls_capability.data = p; |
| 1322 | 281 |
| 2309 | 282 p = ngx_cpymem(p, conf->capability.data, conf->capability.len); |
| 1322 | 283 |
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284 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1); |
| 1322 | 285 |
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286 p = conf->starttls_capability.data |
| 2309 | 287 + (last - conf->capability.data) + 3; |
| 1322 | 288 *p = '-'; |
| 289 | |
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290 size = (auth - conf->capability.data) |
| 1322 | 291 + sizeof("250 STARTTLS" CRLF) - 1; |
| 292 | |
| 2049 | 293 p = ngx_pnalloc(cf->pool, size); |
| 1322 | 294 if (p == NULL) { |
| 295 return NGX_CONF_ERROR; | |
| 296 } | |
| 297 | |
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298 conf->starttls_only_capability.len = size; |
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299 conf->starttls_only_capability.data = p; |
| 1322 | 300 |
| 2309 | 301 p = ngx_cpymem(p, conf->capability.data, auth - conf->capability.data); |
| 1322 | 302 |
| 303 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1); | |
| 304 | |
| 2309 | 305 if (last < auth) { |
| 306 p = conf->starttls_only_capability.data | |
| 307 + (last - conf->capability.data) + 3; | |
| 308 *p = '-'; | |
| 309 } | |
| 310 | |
| 521 | 311 return NGX_CONF_OK; |
| 312 } |