Mercurial > hg > nginx
annotate src/mail/ngx_mail_imap_module.c @ 7938:dc955d274130
Mail: connections with wrong ALPN protocols are now rejected.
This is a recommended behavior by RFC 7301 and is useful
for mitigation of protocol confusion attacks [1].
For POP3 and IMAP protocols IANA-assigned ALPN IDs are used [2].
For the SMTP protocol "smtp" is used.
[1] https://alpaca-attack.com/
[2] https://www.iana.org/assignments/tls-extensiontype-values/
author | Vladimir Homutov <vl@nginx.com> |
---|---|
date | Wed, 20 Oct 2021 09:45:34 +0300 |
parents | bcb107bb89cd |
children | 4538c1ffb0f8 |
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_imap_module.h> |
521 | 13 |
14 | |
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15 static void *ngx_mail_imap_create_srv_conf(ngx_conf_t *cf); |
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16 static char *ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, |
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17 void *child); |
521 | 18 |
19 | |
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20 static ngx_str_t ngx_mail_imap_default_capabilities[] = { |
527 | 21 ngx_string("IMAP4"), |
22 ngx_string("IMAP4rev1"), | |
23 ngx_string("UIDPLUS"), | |
24 ngx_null_string | |
25 }; | |
26 | |
27 | |
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28 static ngx_conf_bitmask_t ngx_mail_imap_auth_methods[] = { |
1323 | 29 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED }, |
30 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED }, | |
31 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED }, | |
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32 { ngx_string("external"), NGX_MAIL_AUTH_EXTERNAL_ENABLED }, |
1323 | 33 { ngx_null_string, 0 } |
34 }; | |
35 | |
36 | |
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37 static ngx_str_t ngx_mail_imap_auth_methods_names[] = { |
1323 | 38 ngx_string("AUTH=PLAIN"), |
39 ngx_string("AUTH=LOGIN"), | |
40 ngx_null_string, /* APOP */ | |
2309 | 41 ngx_string("AUTH=CRAM-MD5"), |
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42 ngx_string("AUTH=EXTERNAL"), |
2309 | 43 ngx_null_string /* NONE */ |
1323 | 44 }; |
45 | |
46 | |
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47 static ngx_mail_protocol_t ngx_mail_imap_protocol = { |
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48 ngx_string("imap"), |
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49 ngx_string("\x04imap"), |
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50 { 143, 993, 0, 0 }, |
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51 NGX_MAIL_IMAP_PROTOCOL, |
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52 |
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53 ngx_mail_imap_init_session, |
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54 ngx_mail_imap_init_protocol, |
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55 ngx_mail_imap_parse_command, |
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56 ngx_mail_imap_auth_state, |
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57 |
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58 ngx_string("* BAD internal server error" CRLF), |
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59 ngx_string("* BYE SSL certificate error" CRLF), |
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60 ngx_string("* BYE No required SSL certificate" CRLF) |
1136 | 61 }; |
62 | |
63 | |
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64 static ngx_command_t ngx_mail_imap_commands[] = { |
521 | 65 |
66 { ngx_string("imap_client_buffer"), | |
1136 | 67 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
521 | 68 ngx_conf_set_size_slot, |
1136 | 69 NGX_MAIL_SRV_CONF_OFFSET, |
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70 offsetof(ngx_mail_imap_srv_conf_t, client_buffer_size), |
527 | 71 NULL }, |
72 | |
73 { ngx_string("imap_capabilities"), | |
1136 | 74 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE, |
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75 ngx_mail_capabilities, |
1136 | 76 NGX_MAIL_SRV_CONF_OFFSET, |
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77 offsetof(ngx_mail_imap_srv_conf_t, capabilities), |
800 | 78 NULL }, |
79 | |
1323 | 80 { ngx_string("imap_auth"), |
81 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE, | |
82 ngx_conf_set_bitmask_slot, | |
83 NGX_MAIL_SRV_CONF_OFFSET, | |
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84 offsetof(ngx_mail_imap_srv_conf_t, auth_methods), |
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85 &ngx_mail_imap_auth_methods }, |
800 | 86 |
521 | 87 ngx_null_command |
88 }; | |
89 | |
90 | |
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91 static ngx_mail_module_t ngx_mail_imap_module_ctx = { |
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92 &ngx_mail_imap_protocol, /* protocol */ |
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93 |
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94 NULL, /* create main configuration */ |
521 | 95 NULL, /* init main configuration */ |
96 | |
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97 ngx_mail_imap_create_srv_conf, /* create server configuration */ |
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98 ngx_mail_imap_merge_srv_conf /* merge server configuration */ |
521 | 99 }; |
100 | |
101 | |
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102 ngx_module_t ngx_mail_imap_module = { |
521 | 103 NGX_MODULE_V1, |
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104 &ngx_mail_imap_module_ctx, /* module context */ |
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105 ngx_mail_imap_commands, /* module directives */ |
1136 | 106 NGX_MAIL_MODULE, /* module type */ |
541 | 107 NULL, /* init master */ |
521 | 108 NULL, /* init module */ |
541 | 109 NULL, /* init process */ |
110 NULL, /* init thread */ | |
111 NULL, /* exit thread */ | |
112 NULL, /* exit process */ | |
113 NULL, /* exit master */ | |
114 NGX_MODULE_V1_PADDING | |
521 | 115 }; |
116 | |
117 | |
118 static void * | |
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119 ngx_mail_imap_create_srv_conf(ngx_conf_t *cf) |
577 | 120 { |
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121 ngx_mail_imap_srv_conf_t *iscf; |
641 | 122 |
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123 iscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_imap_srv_conf_t)); |
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124 if (iscf == NULL) { |
527 | 125 return NULL; |
521 | 126 } |
127 | |
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128 iscf->client_buffer_size = NGX_CONF_UNSET_SIZE; |
521 | 129 |
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130 if (ngx_array_init(&iscf->capabilities, cf->pool, 4, sizeof(ngx_str_t)) |
1136 | 131 != NGX_OK) |
132 { | |
133 return NULL; | |
134 } | |
135 | |
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136 return iscf; |
521 | 137 } |
138 | |
139 | |
140 static char * | |
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141 ngx_mail_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) |
521 | 142 { |
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143 ngx_mail_imap_srv_conf_t *prev = parent; |
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144 ngx_mail_imap_srv_conf_t *conf = child; |
521 | 145 |
1322 | 146 u_char *p, *auth; |
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147 size_t size; |
527 | 148 ngx_str_t *c, *d; |
1136 | 149 ngx_uint_t i, m; |
527 | 150 |
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151 ngx_conf_merge_size_value(conf->client_buffer_size, |
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152 prev->client_buffer_size, |
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153 (size_t) ngx_pagesize); |
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154 |
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155 ngx_conf_merge_bitmask_value(conf->auth_methods, |
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156 prev->auth_methods, |
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157 (NGX_CONF_BITMASK_SET |
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158 |NGX_MAIL_AUTH_PLAIN_ENABLED)); |
1323 | 159 |
800 | 160 |
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161 if (conf->capabilities.nelts == 0) { |
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162 conf->capabilities = prev->capabilities; |
527 | 163 } |
164 | |
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165 if (conf->capabilities.nelts == 0) { |
527 | 166 |
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167 for (d = ngx_mail_imap_default_capabilities; d->len; d++) { |
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168 c = ngx_array_push(&conf->capabilities); |
527 | 169 if (c == NULL) { |
170 return NGX_CONF_ERROR; | |
171 } | |
172 | |
173 *c = *d; | |
174 } | |
175 } | |
176 | |
1136 | 177 size = sizeof("* CAPABILITY" CRLF) - 1; |
527 | 178 |
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179 c = conf->capabilities.elts; |
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180 for (i = 0; i < conf->capabilities.nelts; i++) { |
527 | 181 size += 1 + c[i].len; |
182 } | |
183 | |
1323 | 184 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
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185 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
1323 | 186 m <<= 1, i++) |
187 { | |
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188 if (m & conf->auth_methods) { |
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189 size += 1 + ngx_mail_imap_auth_methods_names[i].len; |
1323 | 190 } |
191 } | |
192 | |
2049 | 193 p = ngx_pnalloc(cf->pool, size); |
583 | 194 if (p == NULL) { |
195 return NGX_CONF_ERROR; | |
196 } | |
197 | |
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198 conf->capability.len = size; |
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199 conf->capability.data = p; |
583 | 200 |
201 p = ngx_cpymem(p, "* CAPABILITY", sizeof("* CAPABILITY") - 1); | |
202 | |
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203 for (i = 0; i < conf->capabilities.nelts; i++) { |
583 | 204 *p++ = ' '; |
205 p = ngx_cpymem(p, c[i].data, c[i].len); | |
206 } | |
207 | |
1323 | 208 auth = p; |
209 | |
210 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; | |
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211 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
1323 | 212 m <<= 1, i++) |
213 { | |
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214 if (m & conf->auth_methods) { |
1323 | 215 *p++ = ' '; |
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216 p = ngx_cpymem(p, ngx_mail_imap_auth_methods_names[i].data, |
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217 ngx_mail_imap_auth_methods_names[i].len); |
1323 | 218 } |
219 } | |
220 | |
583 | 221 *p++ = CR; *p = LF; |
222 | |
223 | |
224 size += sizeof(" STARTTLS") - 1; | |
225 | |
2049 | 226 p = ngx_pnalloc(cf->pool, size); |
583 | 227 if (p == NULL) { |
527 | 228 return NGX_CONF_ERROR; |
229 } | |
230 | |
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231 conf->starttls_capability.len = size; |
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232 conf->starttls_capability.data = p; |
527 | 233 |
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234 p = ngx_cpymem(p, conf->capability.data, |
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235 conf->capability.len - (sizeof(CRLF) - 1)); |
583 | 236 p = ngx_cpymem(p, " STARTTLS", sizeof(" STARTTLS") - 1); |
237 *p++ = CR; *p = LF; | |
238 | |
239 | |
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240 size = (auth - conf->capability.data) + sizeof(CRLF) - 1 |
1323 | 241 + sizeof(" STARTTLS LOGINDISABLED") - 1; |
583 | 242 |
2049 | 243 p = ngx_pnalloc(cf->pool, size); |
583 | 244 if (p == NULL) { |
245 return NGX_CONF_ERROR; | |
527 | 246 } |
247 | |
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248 conf->starttls_only_capability.len = size; |
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249 conf->starttls_only_capability.data = p; |
527 | 250 |
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251 p = ngx_cpymem(p, conf->capability.data, |
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252 auth - conf->capability.data); |
1323 | 253 p = ngx_cpymem(p, " STARTTLS LOGINDISABLED", |
254 sizeof(" STARTTLS LOGINDISABLED") - 1); | |
583 | 255 *p++ = CR; *p = LF; |
256 | |
521 | 257 return NGX_CONF_OK; |
258 } |