Mercurial > hg > nginx
annotate src/mail/ngx_mail_smtp_module.c @ 9236:d9a52ebb9b00
Mail: max_commands directive.
The directive specifies the maximum number of commands allowed during
authentication, after which the connection is closed. The default
limit is 1000, which is not expected to affect any well-behaving clients,
since authentication usually requires at most several commands, though
will effectively stop malicious clients from flooding the server with
with commands.
| author | Maxim Dounin <mdounin@mdounin.ru> |
|---|---|
| date | Sat, 30 Mar 2024 05:05:53 +0300 |
| parents | dc955d274130 |
| 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_smtp_module.h> |
| 521 | 13 |
| 14 | |
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15 static void *ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf); |
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16 static char *ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, |
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17 void *child); |
| 527 | 18 |
| 19 | |
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20 static ngx_conf_bitmask_t ngx_mail_smtp_auth_methods[] = { |
| 1323 | 21 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED }, |
| 22 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED }, | |
| 23 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED }, | |
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24 { ngx_string("external"), NGX_MAIL_AUTH_EXTERNAL_ENABLED }, |
| 2309 | 25 { ngx_string("none"), NGX_MAIL_AUTH_NONE_ENABLED }, |
| 1323 | 26 { ngx_null_string, 0 } |
| 27 }; | |
| 28 | |
| 29 | |
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30 static ngx_str_t ngx_mail_smtp_auth_methods_names[] = { |
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31 ngx_string("PLAIN"), |
| 1136 | 32 ngx_string("LOGIN"), |
| 33 ngx_null_string, /* APOP */ | |
| 2309 | 34 ngx_string("CRAM-MD5"), |
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35 ngx_string("EXTERNAL"), |
| 2309 | 36 ngx_null_string /* NONE */ |
| 1136 | 37 }; |
| 38 | |
| 39 | |
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40 static ngx_mail_protocol_t ngx_mail_smtp_protocol = { |
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41 ngx_string("smtp"), |
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42 ngx_string("\x04smtp"), |
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43 { 25, 465, 587, 0 }, |
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44 NGX_MAIL_SMTP_PROTOCOL, |
| 809 | 45 |
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46 ngx_mail_smtp_init_session, |
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47 ngx_mail_smtp_init_protocol, |
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48 ngx_mail_smtp_parse_command, |
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49 ngx_mail_smtp_auth_state, |
| 809 | 50 |
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51 ngx_string("451 4.3.2 Internal server error" CRLF), |
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52 ngx_string("421 4.7.1 SSL certificate error" CRLF), |
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53 ngx_string("421 4.7.1 No required SSL certificate" CRLF) |
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54 }; |
| 809 | 55 |
| 56 | |
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57 static ngx_command_t ngx_mail_smtp_commands[] = { |
| 521 | 58 |
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59 { ngx_string("smtp_client_buffer"), |
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60 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
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61 ngx_conf_set_size_slot, |
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62 NGX_MAIL_SRV_CONF_OFFSET, |
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63 offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size), |
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64 NULL }, |
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65 |
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66 { ngx_string("smtp_greeting_delay"), |
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67 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1, |
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68 ngx_conf_set_msec_slot, |
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69 NGX_MAIL_SRV_CONF_OFFSET, |
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70 offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay), |
| 1136 | 71 NULL }, |
| 72 | |
| 73 { ngx_string("smtp_capabilities"), | |
| 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_smtp_srv_conf_t, capabilities), |
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78 NULL }, |
| 1323 | 79 |
| 1136 | 80 { ngx_string("smtp_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_smtp_srv_conf_t, auth_methods), |
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85 &ngx_mail_smtp_auth_methods }, |
| 800 | 86 |
| 521 | 87 ngx_null_command |
| 88 }; | |
| 89 | |
| 90 | |
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91 static ngx_mail_module_t ngx_mail_smtp_module_ctx = { |
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92 &ngx_mail_smtp_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_smtp_create_srv_conf, /* create server configuration */ |
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98 ngx_mail_smtp_merge_srv_conf /* merge server configuration */ |
| 521 | 99 }; |
| 100 | |
| 101 | |
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102 ngx_module_t ngx_mail_smtp_module = { |
| 521 | 103 NGX_MODULE_V1, |
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104 &ngx_mail_smtp_module_ctx, /* module context */ |
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105 ngx_mail_smtp_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_smtp_create_srv_conf(ngx_conf_t *cf) |
| 577 | 120 { |
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121 ngx_mail_smtp_srv_conf_t *sscf; |
| 641 | 122 |
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123 sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t)); |
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124 if (sscf == NULL) { |
| 527 | 125 return NULL; |
| 521 | 126 } |
| 127 | |
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128 sscf->client_buffer_size = NGX_CONF_UNSET_SIZE; |
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129 sscf->greeting_delay = NGX_CONF_UNSET_MSEC; |
| 521 | 130 |
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131 if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t)) |
| 1136 | 132 != NGX_OK) |
| 133 { | |
| 134 return NULL; | |
| 135 } | |
| 136 | |
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137 return sscf; |
| 521 | 138 } |
| 139 | |
| 140 | |
| 141 static char * | |
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142 ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child) |
| 521 | 143 { |
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144 ngx_mail_smtp_srv_conf_t *prev = parent; |
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145 ngx_mail_smtp_srv_conf_t *conf = child; |
| 521 | 146 |
| 2309 | 147 u_char *p, *auth, *last; |
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148 size_t size; |
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149 ngx_str_t *c; |
| 2309 | 150 ngx_uint_t i, m, auth_enabled; |
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151 ngx_mail_core_srv_conf_t *cscf; |
| 527 | 152 |
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153 ngx_conf_merge_size_value(conf->client_buffer_size, |
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154 prev->client_buffer_size, |
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155 (size_t) ngx_pagesize); |
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156 |
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157 ngx_conf_merge_msec_value(conf->greeting_delay, |
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158 prev->greeting_delay, 0); |
| 521 | 159 |
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160 ngx_conf_merge_bitmask_value(conf->auth_methods, |
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161 prev->auth_methods, |
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162 (NGX_CONF_BITMASK_SET |
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smtp_client_buffer and smtp_greeting_delay
Igor Sysoev <igor@sysoev.ru>
parents:
1323
diff
changeset
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163 |NGX_MAIL_AUTH_PLAIN_ENABLED |
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b58ce1cf66da
smtp_client_buffer and smtp_greeting_delay
Igor Sysoev <igor@sysoev.ru>
parents:
1323
diff
changeset
|
164 |NGX_MAIL_AUTH_LOGIN_ENABLED)); |
| 800 | 165 |
| 166 | |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
167 cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module); |
| 527 | 168 |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
169 size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len; |
| 809 | 170 |
| 2049 | 171 p = ngx_pnalloc(cf->pool, size); |
| 583 | 172 if (p == NULL) { |
| 527 | 173 return NGX_CONF_ERROR; |
| 174 } | |
| 175 | |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
176 conf->greeting.len = size; |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
177 conf->greeting.data = p; |
| 527 | 178 |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
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179 *p++ = '2'; *p++ = '2'; *p++ = '0'; *p++ = ' '; |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
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changeset
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180 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
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changeset
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181 ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1); |
| 583 | 182 |
| 183 | |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
184 size = sizeof("250 " CRLF) - 1 + cscf->server_name.len; |
| 527 | 185 |
| 2049 | 186 p = ngx_pnalloc(cf->pool, size); |
| 583 | 187 if (p == NULL) { |
| 188 return NGX_CONF_ERROR; | |
| 189 } | |
| 190 | |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
191 conf->server_name.len = size; |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
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192 conf->server_name.data = p; |
| 583 | 193 |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
194 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' '; |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
195 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
196 *p++ = CR; *p = LF; |
| 527 | 197 |
| 198 | |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
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changeset
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199 if (conf->capabilities.nelts == 0) { |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
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200 conf->capabilities = prev->capabilities; |
| 1136 | 201 } |
| 202 | |
| 2309 | 203 size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1; |
| 1136 | 204 |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
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changeset
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205 c = conf->capabilities.elts; |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
206 for (i = 0; i < conf->capabilities.nelts; i++) { |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
207 size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1; |
| 527 | 208 } |
| 209 | |
| 2309 | 210 auth_enabled = 0; |
| 211 | |
| 1323 | 212 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
|
6774
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
5989
diff
changeset
|
213 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
| 1323 | 214 m <<= 1, i++) |
| 215 { | |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
216 if (m & conf->auth_methods) { |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
217 size += 1 + ngx_mail_smtp_auth_methods_names[i].len; |
| 2309 | 218 auth_enabled = 1; |
| 1323 | 219 } |
| 220 } | |
| 221 | |
| 2309 | 222 if (auth_enabled) { |
| 223 size += sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1; | |
| 224 } | |
| 225 | |
| 2049 | 226 p = ngx_pnalloc(cf->pool, size); |
| 583 | 227 if (p == NULL) { |
| 228 return NGX_CONF_ERROR; | |
| 229 } | |
| 230 | |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
231 conf->capability.len = size; |
|
f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
232 conf->capability.data = p; |
| 1136 | 233 |
| 2309 | 234 last = p; |
| 235 | |
| 1136 | 236 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-'; |
|
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
237 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len); |
| 1136 | 238 *p++ = CR; *p++ = LF; |
| 239 | |
|
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
240 for (i = 0; i < conf->capabilities.nelts; i++) { |
| 2309 | 241 last = p; |
| 1136 | 242 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-'; |
| 243 p = ngx_cpymem(p, c[i].data, c[i].len); | |
| 244 *p++ = CR; *p++ = LF; | |
| 245 } | |
| 246 | |
| 1322 | 247 auth = p; |
| 248 | |
| 2309 | 249 if (auth_enabled) { |
| 250 last = p; | |
| 251 | |
| 252 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' '; | |
| 253 *p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H'; | |
| 1136 | 254 |
| 2309 | 255 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0; |
|
6774
bcb107bb89cd
Mail: support SASL EXTERNAL (RFC 4422).
Rob N ★ <robn@fastmail.com>
parents:
5989
diff
changeset
|
256 m <= NGX_MAIL_AUTH_EXTERNAL_ENABLED; |
| 2309 | 257 m <<= 1, i++) |
| 258 { | |
| 259 if (m & conf->auth_methods) { | |
| 260 *p++ = ' '; | |
| 261 p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data, | |
| 262 ngx_mail_smtp_auth_methods_names[i].len); | |
| 263 } | |
| 1136 | 264 } |
| 2309 | 265 |
| 266 *p++ = CR; *p = LF; | |
| 1136 | 267 |
| 2309 | 268 } else { |
| 269 last[3] = ' '; | |
| 270 } | |
| 1136 | 271 |
| 1322 | 272 size += sizeof("250 STARTTLS" CRLF) - 1; |
| 273 | |
| 2049 | 274 p = ngx_pnalloc(cf->pool, size); |
| 1322 | 275 if (p == NULL) { |
| 276 return NGX_CONF_ERROR; | |
| 277 } | |
| 278 | |
|
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
279 conf->starttls_capability.len = size; |
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f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
280 conf->starttls_capability.data = p; |
| 1322 | 281 |
| 2309 | 282 p = ngx_cpymem(p, conf->capability.data, conf->capability.len); |
| 1322 | 283 |
|
6860
f18c285c2e59
Win32: fixed some warnings reported by Borland C.
Maxim Dounin <mdounin@mdounin.ru>
parents:
6774
diff
changeset
|
284 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1); |
| 1322 | 285 |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
286 p = conf->starttls_capability.data |
| 2309 | 287 + (last - conf->capability.data) + 3; |
| 1322 | 288 *p = '-'; |
| 289 | |
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
290 size = (auth - conf->capability.data) |
| 1322 | 291 + sizeof("250 STARTTLS" CRLF) - 1; |
| 292 | |
| 2049 | 293 p = ngx_pnalloc(cf->pool, size); |
| 1322 | 294 if (p == NULL) { |
| 295 return NGX_CONF_ERROR; | |
| 296 } | |
| 297 | |
|
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ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
298 conf->starttls_only_capability.len = size; |
|
f69493e8faab
ngx_mail_pop3_module, ngx_mail_imap_module, and ngx_mail_smtp_module
Igor Sysoev <igor@sysoev.ru>
parents:
1481
diff
changeset
|
299 conf->starttls_only_capability.data = p; |
| 1322 | 300 |
| 2309 | 301 p = ngx_cpymem(p, conf->capability.data, auth - conf->capability.data); |
| 1322 | 302 |
| 303 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1); | |
| 304 | |
| 2309 | 305 if (last < auth) { |
| 306 p = conf->starttls_only_capability.data | |
| 307 + (last - conf->capability.data) + 3; | |
| 308 *p = '-'; | |
| 309 } | |
| 310 | |
| 521 | 311 return NGX_CONF_OK; |
| 312 } |