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_pop3_module.h>
12
13
14 static void *ngx_mail_pop3_create_srv_conf(ngx_conf_t *cf);
15 static char *ngx_mail_pop3_merge_srv_conf(ngx_conf_t *cf, void *parent,
16 void *child);
17
18
19 static ngx_str_t ngx_mail_pop3_default_capabilities[] = {
20 ngx_string("TOP"),
21 ngx_string("USER"),
22 ngx_string("UIDL"),
23 ngx_null_string
24 };
25
26
27 static ngx_conf_bitmask_t ngx_mail_pop3_auth_methods[] = {
28 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
29 { ngx_string("apop"), NGX_MAIL_AUTH_APOP_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_pop3_auth_plain_capability =
36 ngx_string("+OK methods supported:" CRLF
37 "LOGIN" CRLF
38 "PLAIN" CRLF
39 "." CRLF);
40
41
42 static ngx_str_t ngx_mail_pop3_auth_cram_md5_capability =
43 ngx_string("+OK methods supported:" CRLF
44 "LOGIN" CRLF
45 "PLAIN" CRLF
46 "CRAM-MD5" CRLF
47 "." CRLF);
48
49
50 static ngx_mail_protocol_t ngx_mail_pop3_protocol = {
51 ngx_string("pop3"),
52 { 110, 995, 0, 0 },
53 NGX_MAIL_POP3_PROTOCOL,
54
55 ngx_mail_pop3_init_session,
56 ngx_mail_pop3_init_protocol,
57 ngx_mail_pop3_parse_command,
58 ngx_mail_pop3_auth_state,
59
60 ngx_string("-ERR internal server error" CRLF)
61 };
62
63
64 static ngx_command_t ngx_mail_pop3_commands[] = {
65
66 { ngx_string("pop3_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_pop3_srv_conf_t, capabilities),
71 NULL },
72
73 { ngx_string("pop3_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_pop3_srv_conf_t, auth_methods),
78 &ngx_mail_pop3_auth_methods },
79
80 ngx_null_command
81 };
82
83
84 static ngx_mail_module_t ngx_mail_pop3_module_ctx = {
85 &ngx_mail_pop3_protocol, /* protocol */
86
87 NULL, /* create main configuration */
88 NULL, /* init main configuration */
89
90 ngx_mail_pop3_create_srv_conf, /* create server configuration */
91 ngx_mail_pop3_merge_srv_conf /* merge server configuration */
92 };
93
94
95 ngx_module_t ngx_mail_pop3_module = {
96 NGX_MODULE_V1,
97 &ngx_mail_pop3_module_ctx, /* module context */
98 ngx_mail_pop3_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_pop3_create_srv_conf(ngx_conf_t *cf)
113 {
114 ngx_mail_pop3_srv_conf_t *pscf;
115
116 pscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_pop3_srv_conf_t));
117 if (pscf == NULL) {
118 return NULL;
119 }
120
121 if (ngx_array_init(&pscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
122 != NGX_OK)
123 {
124 return NULL;
125 }
126
127 return pscf;
128 }
129
130
131 static char *
132 ngx_mail_pop3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
133 {
134 ngx_mail_pop3_srv_conf_t *prev = parent;
135 ngx_mail_pop3_srv_conf_t *conf = child;
136
137 u_char *p;
138 size_t size, stls_only_size;
139 ngx_str_t *c, *d;
140 ngx_uint_t i;
141
142 ngx_conf_merge_bitmask_value(conf->auth_methods,
143 prev->auth_methods,
144 (NGX_CONF_BITMASK_SET
145 |NGX_MAIL_AUTH_PLAIN_ENABLED));
146
147 if (conf->capabilities.nelts == 0) {
148 conf->capabilities = prev->capabilities;
149 }
150
151 if (conf->capabilities.nelts == 0) {
152
153 for (d = ngx_mail_pop3_default_capabilities; d->len; d++) {
154 c = ngx_array_push(&conf->capabilities);
155 if (c == NULL) {
156 return NGX_CONF_ERROR;
157 }
158
159 *c = *d;
160 }
161 }
162
163 size = sizeof("+OK Capability list follows" CRLF) - 1
164 + sizeof("." CRLF) - 1;
165
166 stls_only_size = size + sizeof("STLS" CRLF) - 1;
167
168 c = conf->capabilities.elts;
169 for (i = 0; i < conf->capabilities.nelts; i++) {
170 size += c[i].len + sizeof(CRLF) - 1;
171
172 if (ngx_strcasecmp(c[i].data, (u_char *) "USER") == 0) {
173 continue;
174 }
175
176 stls_only_size += c[i].len + sizeof(CRLF) - 1;
177 }
178
179 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
180 size += sizeof("SASL LOGIN PLAIN CRAM-MD5" CRLF) - 1;
181
182 } else {
183 size += sizeof("SASL LOGIN PLAIN" CRLF) - 1;
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, "+OK Capability list follows" CRLF,
195 sizeof("+OK Capability list follows" CRLF) - 1);
196
197 for (i = 0; i < conf->capabilities.nelts; i++) {
198 p = ngx_cpymem(p, c[i].data, c[i].len);
199 *p++ = CR; *p++ = LF;
200 }
201
202 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
203 p = ngx_cpymem(p, "SASL LOGIN PLAIN CRAM-MD5" CRLF,
204 sizeof("SASL LOGIN PLAIN CRAM-MD5" CRLF) - 1);
205
206 } else {
207 p = ngx_cpymem(p, "SASL LOGIN PLAIN" CRLF,
208 sizeof("SASL LOGIN PLAIN" CRLF) - 1);
209 }
210
211 *p++ = '.'; *p++ = CR; *p = LF;
212
213
214 size += sizeof("STLS" CRLF) - 1;
215
216 p = ngx_palloc(cf->pool, size);
217 if (p == NULL) {
218 return NGX_CONF_ERROR;
219 }
220
221 conf->starttls_capability.len = size;
222 conf->starttls_capability.data = p;
223
224 p = ngx_cpymem(p, conf->capability.data,
225 conf->capability.len - (sizeof("." CRLF) - 1));
226
227 p = ngx_cpymem(p, "STLS" CRLF, sizeof("STLS" CRLF) - 1);
228 *p++ = '.'; *p++ = CR; *p = LF;
229
230
231 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
232 conf->auth_capability = ngx_mail_pop3_auth_cram_md5_capability;
233
234 } else {
235 conf->auth_capability = ngx_mail_pop3_auth_plain_capability;
236 }
237
238
239 p = ngx_palloc(cf->pool, stls_only_size);
240 if (p == NULL) {
241 return NGX_CONF_ERROR;
242 }
243
244 conf->starttls_only_capability.len = stls_only_size;
245 conf->starttls_only_capability.data = p;
246
247 p = ngx_cpymem(p, "+OK Capability list follows" CRLF,
248 sizeof("+OK Capability list follows" CRLF) - 1);
249
250 for (i = 0; i < conf->capabilities.nelts; i++) {
251 if (ngx_strcasecmp(c[i].data, (u_char *) "USER") == 0) {
252 continue;
253 }
254
255 p = ngx_cpymem(p, c[i].data, c[i].len);
256 *p++ = CR; *p++ = LF;
257 }
258
259 p = ngx_cpymem(p, "STLS" CRLF, sizeof("STLS" CRLF) - 1);
260 *p++ = '.'; *p++ = CR; *p = LF;
261
262 return NGX_CONF_OK;
263 }
264
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