Mercurial > hg > nginx
annotate src/mail/ngx_mail_smtp_module.c @ 6774:bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
This is needed to allow TLS client certificate auth to work. With
ssl_verify_client configured, the auth daemon can choose to allow the
connection to proceed based on the certificate data.
This has been tested with Thunderbird for IMAP only. I've not yet found a
client that will do client certificate auth for POP3 or SMTP, and the method is
not really documented anywhere that I can find. That said, its simple enough
that the way I've done is probably right.
| author | Rob N ★ <robn@fastmail.com> |
|---|---|
| date | Sat, 08 Oct 2016 18:05:00 +1100 |
| parents | ec01b1d1fff1 |
| children | f18c285c2e59 |
| 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 { 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 |
| 283 p = ngx_cpymem(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1); | |
| 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 } |