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_null_string, 0 }
24 };
25
26
27 static ngx_str_t ngx_mail_smtp_auth_methods_names[] = {
28 ngx_string("PLAIN"),
29 ngx_string("LOGIN"),
30 ngx_null_string, /* APOP */
31 ngx_string("CRAM-MD5")
32 };
33
34
35 static ngx_mail_protocol_t ngx_mail_smtp_protocol = {
36 ngx_string("smtp"),
37 { 25, 465, 587, 0 },
38 NGX_MAIL_SMTP_PROTOCOL,
39
40 ngx_mail_smtp_init_session,
41 ngx_mail_smtp_init_protocol,
42 ngx_mail_smtp_parse_command,
43 ngx_mail_smtp_auth_state,
44
45 ngx_string("451 4.3.2 Internal server error" CRLF)
46 };
47
48
49 static ngx_command_t ngx_mail_smtp_commands[] = {
50
51 { ngx_string("smtp_client_buffer"),
52 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
53 ngx_conf_set_size_slot,
54 NGX_MAIL_SRV_CONF_OFFSET,
55 offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size),
56 NULL },
57
58 { ngx_string("smtp_greeting_delay"),
59 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
60 ngx_conf_set_msec_slot,
61 NGX_MAIL_SRV_CONF_OFFSET,
62 offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay),
63 NULL },
64
65 { ngx_string("smtp_capabilities"),
66 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
67 ngx_mail_capabilities,
68 NGX_MAIL_SRV_CONF_OFFSET,
69 offsetof(ngx_mail_smtp_srv_conf_t, capabilities),
70 NULL },
71
72 { ngx_string("smtp_auth"),
73 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
74 ngx_conf_set_bitmask_slot,
75 NGX_MAIL_SRV_CONF_OFFSET,
76 offsetof(ngx_mail_smtp_srv_conf_t, auth_methods),
77 &ngx_mail_smtp_auth_methods },
78
79 ngx_null_command
80 };
81
82
83 static ngx_mail_module_t ngx_mail_smtp_module_ctx = {
84 &ngx_mail_smtp_protocol, /* protocol */
85
86 NULL, /* create main configuration */
87 NULL, /* init main configuration */
88
89 ngx_mail_smtp_create_srv_conf, /* create server configuration */
90 ngx_mail_smtp_merge_srv_conf /* merge server configuration */
91 };
92
93
94 ngx_module_t ngx_mail_smtp_module = {
95 NGX_MODULE_V1,
96 &ngx_mail_smtp_module_ctx, /* module context */
97 ngx_mail_smtp_commands, /* module directives */
98 NGX_MAIL_MODULE, /* module type */
99 NULL, /* init master */
100 NULL, /* init module */
101 NULL, /* init process */
102 NULL, /* init thread */
103 NULL, /* exit thread */
104 NULL, /* exit process */
105 NULL, /* exit master */
106 NGX_MODULE_V1_PADDING
107 };
108
109
110 static void *
111 ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf)
112 {
113 ngx_mail_smtp_srv_conf_t *sscf;
114
115 sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t));
116 if (sscf == NULL) {
117 return NULL;
118 }
119
120 sscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
121 sscf->greeting_delay = NGX_CONF_UNSET_MSEC;
122
123 if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
124 != NGX_OK)
125 {
126 return NULL;
127 }
128
129 return sscf;
130 }
131
132
133 static char *
134 ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
135 {
136 ngx_mail_smtp_srv_conf_t *prev = parent;
137 ngx_mail_smtp_srv_conf_t *conf = child;
138
139 u_char *p, *auth;
140 size_t size;
141 ngx_str_t *c;
142 ngx_uint_t i, m;
143 ngx_mail_core_srv_conf_t *cscf;
144
145 ngx_conf_merge_size_value(conf->client_buffer_size,
146 prev->client_buffer_size,
147 (size_t) ngx_pagesize);
148
149 ngx_conf_merge_msec_value(conf->greeting_delay,
150 prev->greeting_delay, 0);
151
152 ngx_conf_merge_bitmask_value(conf->auth_methods,
153 prev->auth_methods,
154 (NGX_CONF_BITMASK_SET
155 |NGX_MAIL_AUTH_PLAIN_ENABLED
156 |NGX_MAIL_AUTH_LOGIN_ENABLED));
157
158
159 cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module);
160
161 size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len;
162
163 p = ngx_palloc(cf->pool, size);
164 if (p == NULL) {
165 return NGX_CONF_ERROR;
166 }
167
168 conf->greeting.len = size;
169 conf->greeting.data = p;
170
171 *p++ = '2'; *p++ = '2'; *p++ = ''; *p++ = ' ';
172 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
173 ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1);
174
175
176 size = sizeof("250 " CRLF) - 1 + cscf->server_name.len;
177
178 p = ngx_palloc(cf->pool, size);
179 if (p == NULL) {
180 return NGX_CONF_ERROR;
181 }
182
183 conf->server_name.len = size;
184 conf->server_name.data = p;
185
186 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = ' ';
187 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
188 *p++ = CR; *p = LF;
189
190
191 if (conf->capabilities.nelts == 0) {
192 conf->capabilities = prev->capabilities;
193 }
194
195 size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1
196 + sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1;
197
198 c = conf->capabilities.elts;
199 for (i = 0; i < conf->capabilities.nelts; i++) {
200 size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1;
201 }
202
203 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
204 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
205 m <<= 1, i++)
206 {
207 if (m & conf->auth_methods) {
208 size += 1 + ngx_mail_smtp_auth_methods_names[i].len;
209 }
210 }
211
212 p = ngx_palloc(cf->pool, size);
213 if (p == NULL) {
214 return NGX_CONF_ERROR;
215 }
216
217 conf->capability.len = size;
218 conf->capability.data = p;
219
220 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = '-';
221 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
222 *p++ = CR; *p++ = LF;
223
224 for (i = 0; i < conf->capabilities.nelts; i++) {
225 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = '-';
226 p = ngx_cpymem(p, c[i].data, c[i].len);
227 *p++ = CR; *p++ = LF;
228 }
229
230 auth = p;
231
232 *p++ = '2'; *p++ = '5'; *p++ = ''; *p++ = ' ';
233 *p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H';
234
235 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
236 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
237 m <<= 1, i++)
238 {
239 if (m & conf->auth_methods) {
240 *p++ = ' ';
241 p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data,
242 ngx_mail_smtp_auth_methods_names[i].len);
243 }
244 }
245
246 *p++ = CR; *p = LF;
247
248 size += sizeof("250 STARTTLS" CRLF) - 1;
249
250 p = ngx_palloc(cf->pool, size);
251 if (p == NULL) {
252 return NGX_CONF_ERROR;
253 }
254
255 conf->starttls_capability.len = size;
256 conf->starttls_capability.data = p;
257
258 p = ngx_cpymem(p, conf->capability.data,
259 conf->capability.len);
260
261 p = ngx_cpymem(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
262 *p++ = CR; *p = LF;
263
264 p = conf->starttls_capability.data
265 + (auth - conf->capability.data) + 3;
266 *p = '-';
267
268 size = (auth - conf->capability.data)
269 + sizeof("250 STARTTLS" CRLF) - 1;
270
271 p = ngx_palloc(cf->pool, size);
272 if (p == NULL) {
273 return NGX_CONF_ERROR;
274 }
275
276 conf->starttls_only_capability.len = size;
277 conf->starttls_only_capability.data = p;
278
279 p = ngx_cpymem(p, conf->capability.data,
280 auth - conf->capability.data);
281
282 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
283
284 return NGX_CONF_OK;
285 }
286
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