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_imap_module.h>
12
13
14 static void *ngx_mail_imap_create_srv_conf(ngx_conf_t *cf);
15 static char *ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent,
16 void *child);
17
18
19 static ngx_str_t ngx_mail_imap_default_capabilities[] = {
20 ngx_string("IMAP4"),
21 ngx_string("IMAP4rev1"),
22 ngx_string("UIDPLUS"),
23 ngx_null_string
24 };
25
26
27 static ngx_conf_bitmask_t ngx_mail_imap_auth_methods[] = {
28 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
29 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED },
30 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
31 { ngx_null_string, 0 }
32 };
33
34
35 static ngx_str_t ngx_mail_imap_auth_methods_names[] = {
36 ngx_string("AUTH=PLAIN"),
37 ngx_string("AUTH=LOGIN"),
38 ngx_null_string, /* APOP */
39 ngx_string("AUTH=CRAM-MD5")
40 };
41
42
43 static ngx_mail_protocol_t ngx_mail_imap_protocol = {
44 ngx_string("imap"),
45 { 143, 993, 0, 0 },
46 NGX_MAIL_IMAP_PROTOCOL,
47
48 ngx_mail_imap_init_session,
49 ngx_mail_imap_init_protocol,
50 ngx_mail_imap_parse_command,
51 ngx_mail_imap_auth_state,
52
53 ngx_string("* BAD internal server error" CRLF)
54 };
55
56
57 static ngx_command_t ngx_mail_imap_commands[] = {
58
59 { ngx_string("imap_client_buffer"),
60 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
61 ngx_conf_set_size_slot,
62 NGX_MAIL_SRV_CONF_OFFSET,
63 offsetof(ngx_mail_imap_srv_conf_t, client_buffer_size),
64 NULL },
65
66 { ngx_string("imap_capabilities"),
67 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
68 ngx_mail_capabilities,
69 NGX_MAIL_SRV_CONF_OFFSET,
70 offsetof(ngx_mail_imap_srv_conf_t, capabilities),
71 NULL },
72
73 { ngx_string("imap_auth"),
74 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
75 ngx_conf_set_bitmask_slot,
76 NGX_MAIL_SRV_CONF_OFFSET,
77 offsetof(ngx_mail_imap_srv_conf_t, auth_methods),
78 &ngx_mail_imap_auth_methods },
79
80 ngx_null_command
81 };
82
83
84 static ngx_mail_module_t ngx_mail_imap_module_ctx = {
85 &ngx_mail_imap_protocol, /* protocol */
86
87 NULL, /* create main configuration */
88 NULL, /* init main configuration */
89
90 ngx_mail_imap_create_srv_conf, /* create server configuration */
91 ngx_mail_imap_merge_srv_conf /* merge server configuration */
92 };
93
94
95 ngx_module_t ngx_mail_imap_module = {
96 NGX_MODULE_V1,
97 &ngx_mail_imap_module_ctx, /* module context */
98 ngx_mail_imap_commands, /* module directives */
99 NGX_MAIL_MODULE, /* module type */
100 NULL, /* init master */
101 NULL, /* init module */
102 NULL, /* init process */
103 NULL, /* init thread */
104 NULL, /* exit thread */
105 NULL, /* exit process */
106 NULL, /* exit master */
107 NGX_MODULE_V1_PADDING
108 };
109
110
111 static void *
112 ngx_mail_imap_create_srv_conf(ngx_conf_t *cf)
113 {
114 ngx_mail_imap_srv_conf_t *iscf;
115
116 iscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_imap_srv_conf_t));
117 if (iscf == NULL) {
118 return NULL;
119 }
120
121 iscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
122
123 if (ngx_array_init(&iscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
124 != NGX_OK)
125 {
126 return NULL;
127 }
128
129 return iscf;
130 }
131
132
133 static char *
134 ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
135 {
136 ngx_mail_imap_srv_conf_t *prev = parent;
137 ngx_mail_imap_srv_conf_t *conf = child;
138
139 u_char *p, *auth;
140 size_t size;
141 ngx_str_t *c, *d;
142 ngx_uint_t i, m;
143
144 ngx_conf_merge_size_value(conf->client_buffer_size,
145 prev->client_buffer_size,
146 (size_t) ngx_pagesize);
147
148 ngx_conf_merge_bitmask_value(conf->auth_methods,
149 prev->auth_methods,
150 (NGX_CONF_BITMASK_SET
151 |NGX_MAIL_AUTH_PLAIN_ENABLED));
152
153
154 if (conf->capabilities.nelts == 0) {
155 conf->capabilities = prev->capabilities;
156 }
157
158 if (conf->capabilities.nelts == 0) {
159
160 for (d = ngx_mail_imap_default_capabilities; d->len; d++) {
161 c = ngx_array_push(&conf->capabilities);
162 if (c == NULL) {
163 return NGX_CONF_ERROR;
164 }
165
166 *c = *d;
167 }
168 }
169
170 size = sizeof("* CAPABILITY" CRLF) - 1;
171
172 c = conf->capabilities.elts;
173 for (i = 0; i < conf->capabilities.nelts; i++) {
174 size += 1 + c[i].len;
175 }
176
177 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
178 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
179 m <<= 1, i++)
180 {
181 if (m & conf->auth_methods) {
182 size += 1 + ngx_mail_imap_auth_methods_names[i].len;
183 }
184 }
185
186 p = ngx_palloc(cf->pool, size);
187 if (p == NULL) {
188 return NGX_CONF_ERROR;
189 }
190
191 conf->capability.len = size;
192 conf->capability.data = p;
193
194 p = ngx_cpymem(p, "* CAPABILITY", sizeof("* CAPABILITY") - 1);
195
196 for (i = 0; i < conf->capabilities.nelts; i++) {
197 *p++ = ' ';
198 p = ngx_cpymem(p, c[i].data, c[i].len);
199 }
200
201 auth = p;
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 *p++ = ' ';
209 p = ngx_cpymem(p, ngx_mail_imap_auth_methods_names[i].data,
210 ngx_mail_imap_auth_methods_names[i].len);
211 }
212 }
213
214 *p++ = CR; *p = LF;
215
216
217 size += sizeof(" STARTTLS") - 1;
218
219 p = ngx_palloc(cf->pool, size);
220 if (p == NULL) {
221 return NGX_CONF_ERROR;
222 }
223
224 conf->starttls_capability.len = size;
225 conf->starttls_capability.data = p;
226
227 p = ngx_cpymem(p, conf->capability.data,
228 conf->capability.len - (sizeof(CRLF) - 1));
229 p = ngx_cpymem(p, " STARTTLS", sizeof(" STARTTLS") - 1);
230 *p++ = CR; *p = LF;
231
232
233 size = (auth - conf->capability.data) + sizeof(CRLF) - 1
234 + sizeof(" STARTTLS LOGINDISABLED") - 1;
235
236 p = ngx_palloc(cf->pool, size);
237 if (p == NULL) {
238 return NGX_CONF_ERROR;
239 }
240
241 conf->starttls_only_capability.len = size;
242 conf->starttls_only_capability.data = p;
243
244 p = ngx_cpymem(p, conf->capability.data,
245 auth - conf->capability.data);
246 p = ngx_cpymem(p, " STARTTLS LOGINDISABLED",
247 sizeof(" STARTTLS LOGINDISABLED") - 1);
248 *p++ = CR; *p = LF;
249
250 return NGX_CONF_OK;
251 }
252
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