1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #include <ngx_config.h>
8 #include <ngx_core.h>
9 #include <ngx_event.h>
10 #include <ngx_mail.h>
11 #include <ngx_mail_smtp_module.h>
12
13
14 static void *ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf);
15 static char *ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent,
16 void *child);
17
18
19 static ngx_conf_bitmask_t ngx_mail_smtp_auth_methods[] = {
20 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
21 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED },
22 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
23 { ngx_string("none"), NGX_MAIL_AUTH_NONE_ENABLED },
24 { ngx_null_string, 0 }
25 };
26
27
28 static ngx_str_t ngx_mail_smtp_auth_methods_names[] = {
29 ngx_string("PLAIN"),
30 ngx_string("LOGIN"),
31 ngx_null_string, /* APOP */
32 ngx_string("CRAM-MD5"),
33 ngx_null_string /* NONE */
34 };
35
36
37 static ngx_mail_protocol_t ngx_mail_smtp_protocol = {
38 ngx_string("smtp"),
39 { 25, 465, 587, 0 },
40 NGX_MAIL_SMTP_PROTOCOL,
41
42 ngx_mail_smtp_init_session,
43 ngx_mail_smtp_init_protocol,
44 ngx_mail_smtp_parse_command,
45 ngx_mail_smtp_auth_state,
46
47 ngx_string("451 4.3.2 Internal server error" CRLF)
48 };
49
50
51 static ngx_command_t ngx_mail_smtp_commands[] = {
52
53 { ngx_string("smtp_client_buffer"),
54 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
55 ngx_conf_set_size_slot,
56 NGX_MAIL_SRV_CONF_OFFSET,
57 offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size),
58 NULL },
59
60 { ngx_string("smtp_greeting_delay"),
61 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
62 ngx_conf_set_msec_slot,
63 NGX_MAIL_SRV_CONF_OFFSET,
64 offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay),
65 NULL },
66
67 { ngx_string("smtp_capabilities"),
68 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
69 ngx_mail_capabilities,
70 NGX_MAIL_SRV_CONF_OFFSET,
71 offsetof(ngx_mail_smtp_srv_conf_t, capabilities),
72 NULL },
73
74 { ngx_string("smtp_auth"),
75 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
76 ngx_conf_set_bitmask_slot,
77 NGX_MAIL_SRV_CONF_OFFSET,
78 offsetof(ngx_mail_smtp_srv_conf_t, auth_methods),
79 &ngx_mail_smtp_auth_methods },
80
81 ngx_null_command
82 };
83
84
85 static ngx_mail_module_t ngx_mail_smtp_module_ctx = {
86 &ngx_mail_smtp_protocol, /* protocol */
87
88 NULL, /* create main configuration */
89 NULL, /* init main configuration */
90
91 ngx_mail_smtp_create_srv_conf, /* create server configuration */
92 ngx_mail_smtp_merge_srv_conf /* merge server configuration */
93 };
94
95
96 ngx_module_t ngx_mail_smtp_module = {
97 NGX_MODULE_V1,
98 &ngx_mail_smtp_module_ctx, /* module context */
99 ngx_mail_smtp_commands, /* module directives */
100 NGX_MAIL_MODULE, /* module type */
101 NULL, /* init master */
102 NULL, /* init module */
103 NULL, /* init process */
104 NULL, /* init thread */
105 NULL, /* exit thread */
106 NULL, /* exit process */
107 NULL, /* exit master */
108 NGX_MODULE_V1_PADDING
109 };
110
111
112 static void *
113 ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf)
114 {
115 ngx_mail_smtp_srv_conf_t *sscf;
116
117 sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t));
118 if (sscf == NULL) {
119 return NULL;
120 }
121
122 sscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
123 sscf->greeting_delay = NGX_CONF_UNSET_MSEC;
124
125 if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
126 != NGX_OK)
127 {
128 return NULL;
129 }
130
131 return sscf;
132 }
133
134
135 static char *
136 ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
137 {
138 ngx_mail_smtp_srv_conf_t *prev = parent;
139 ngx_mail_smtp_srv_conf_t *conf = child;
140
141 u_char *p, *auth, *last;
142 size_t size;
143 ngx_str_t *c;
144 ngx_uint_t i, m, auth_enabled;
145 ngx_mail_core_srv_conf_t *cscf;
146
147 ngx_conf_merge_size_value(conf->client_buffer_size,
148 prev->client_buffer_size,
149 (size_t) ngx_pagesize);
150
151 ngx_conf_merge_msec_value(conf->greeting_delay,
152 prev->greeting_delay, 0);
153
154 ngx_conf_merge_bitmask_value(conf->auth_methods,
155 prev->auth_methods,
156 (NGX_CONF_BITMASK_SET
157 |NGX_MAIL_AUTH_PLAIN_ENABLED
158 |NGX_MAIL_AUTH_LOGIN_ENABLED));
159
160
161 cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module);
162
163 size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len;
164
165 p = ngx_pnalloc(cf->pool, size);
166 if (p == NULL) {
167 return NGX_CONF_ERROR;
168 }
169
170 conf->greeting.len = size;
171 conf->greeting.data = p;
172
173 *p++ = '2'; *p++ = '2'; *p++ = ''; *p++ = ' ';
174 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
175 ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1);
176
177
178 size = sizeof("250 " CRLF) - 1 + cscf->server_name.len;
179
180 p = ngx_pnalloc(cf->pool, size);
181 if (p == NULL) {
182 return NGX_CONF_ERROR;
183 }
184
185 conf->server_name.len = size;
186 conf->server_name.data = p;
187
188 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = ' ';
189 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
190 *p++ = CR; *p = LF;
191
192
193 if (conf->capabilities.nelts == 0) {
194 conf->capabilities = prev->capabilities;
195 }
196
197 size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1;
198
199 c = conf->capabilities.elts;
200 for (i = 0; i < conf->capabilities.nelts; i++) {
201 size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1;
202 }
203
204 auth_enabled = 0;
205
206 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
207 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
208 m <<= 1, i++)
209 {
210 if (m & conf->auth_methods) {
211 size += 1 + ngx_mail_smtp_auth_methods_names[i].len;
212 auth_enabled = 1;
213 }
214 }
215
216 if (auth_enabled) {
217 size += sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1;
218 }
219
220 p = ngx_pnalloc(cf->pool, size);
221 if (p == NULL) {
222 return NGX_CONF_ERROR;
223 }
224
225 conf->capability.len = size;
226 conf->capability.data = p;
227
228 last = p;
229
230 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = '-';
231 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
232 *p++ = CR; *p++ = LF;
233
234 for (i = 0; i < conf->capabilities.nelts; i++) {
235 last = p;
236 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = '-';
237 p = ngx_cpymem(p, c[i].data, c[i].len);
238 *p++ = CR; *p++ = LF;
239 }
240
241 auth = p;
242
243 if (auth_enabled) {
244 last = p;
245
246 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = ' ';
247 *p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H';
248
249 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
250 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
251 m <<= 1, i++)
252 {
253 if (m & conf->auth_methods) {
254 *p++ = ' ';
255 p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data,
256 ngx_mail_smtp_auth_methods_names[i].len);
257 }
258 }
259
260 *p++ = CR; *p = LF;
261
262 } else {
263 last[3] = ' ';
264 }
265
266 size += sizeof("250 STARTTLS" CRLF) - 1;
267
268 p = ngx_pnalloc(cf->pool, size);
269 if (p == NULL) {
270 return NGX_CONF_ERROR;
271 }
272
273 conf->starttls_capability.len = size;
274 conf->starttls_capability.data = p;
275
276 p = ngx_cpymem(p, conf->capability.data, conf->capability.len);
277
278 p = ngx_cpymem(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
279 *p++ = CR; *p = LF;
280
281 p = conf->starttls_capability.data
282 + (last - conf->capability.data) + 3;
283 *p = '-';
284
285 size = (auth - conf->capability.data)
286 + sizeof("250 STARTTLS" CRLF) - 1;
287
288 p = ngx_pnalloc(cf->pool, size);
289 if (p == NULL) {
290 return NGX_CONF_ERROR;
291 }
292
293 conf->starttls_only_capability.len = size;
294 conf->starttls_only_capability.data = p;
295
296 p = ngx_cpymem(p, conf->capability.data, auth - conf->capability.data);
297
298 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
299
300 if (last < auth) {
301 p = conf->starttls_only_capability.data
302 + (last - conf->capability.data) + 3;
303 *p = '-';
304 }
305
306 return NGX_CONF_OK;
307 }
308
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