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336
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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660
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4 * Copyright (C) Nginx, Inc.
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336
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_event.h>
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11 #include <ngx_mail.h>
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12 #include <ngx_mail_smtp_module.h>
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13
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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);
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18
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19
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20 static ngx_conf_bitmask_t ngx_mail_smtp_auth_methods[] = {
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21 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
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22 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED },
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23 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
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420
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24 { ngx_string("none"), NGX_MAIL_AUTH_NONE_ENABLED },
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336
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25 { ngx_null_string, 0 }
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26 };
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27
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28
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29 static ngx_str_t ngx_mail_smtp_auth_methods_names[] = {
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30 ngx_string("PLAIN"),
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31 ngx_string("LOGIN"),
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32 ngx_null_string, /* APOP */
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420
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33 ngx_string("CRAM-MD5"),
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34 ngx_null_string /* NONE */
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336
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35 };
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36
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37
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38 static ngx_mail_protocol_t ngx_mail_smtp_protocol = {
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39 ngx_string("smtp"),
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40 { 25, 465, 587, 0 },
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41 NGX_MAIL_SMTP_PROTOCOL,
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42
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43 ngx_mail_smtp_init_session,
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44 ngx_mail_smtp_init_protocol,
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45 ngx_mail_smtp_parse_command,
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46 ngx_mail_smtp_auth_state,
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47
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48 ngx_string("451 4.3.2 Internal server error" CRLF)
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49 };
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50
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51
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52 static ngx_command_t ngx_mail_smtp_commands[] = {
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53
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54 { ngx_string("smtp_client_buffer"),
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55 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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56 ngx_conf_set_size_slot,
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57 NGX_MAIL_SRV_CONF_OFFSET,
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58 offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size),
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59 NULL },
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60
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61 { ngx_string("smtp_greeting_delay"),
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62 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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63 ngx_conf_set_msec_slot,
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64 NGX_MAIL_SRV_CONF_OFFSET,
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65 offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay),
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66 NULL },
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67
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68 { ngx_string("smtp_capabilities"),
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69 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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70 ngx_mail_capabilities,
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71 NGX_MAIL_SRV_CONF_OFFSET,
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72 offsetof(ngx_mail_smtp_srv_conf_t, capabilities),
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73 NULL },
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74
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75 { ngx_string("smtp_auth"),
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76 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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77 ngx_conf_set_bitmask_slot,
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78 NGX_MAIL_SRV_CONF_OFFSET,
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79 offsetof(ngx_mail_smtp_srv_conf_t, auth_methods),
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80 &ngx_mail_smtp_auth_methods },
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81
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82 ngx_null_command
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83 };
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84
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85
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86 static ngx_mail_module_t ngx_mail_smtp_module_ctx = {
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87 &ngx_mail_smtp_protocol, /* protocol */
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88
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89 NULL, /* create main configuration */
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90 NULL, /* init main configuration */
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91
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92 ngx_mail_smtp_create_srv_conf, /* create server configuration */
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93 ngx_mail_smtp_merge_srv_conf /* merge server configuration */
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94 };
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95
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96
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97 ngx_module_t ngx_mail_smtp_module = {
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98 NGX_MODULE_V1,
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99 &ngx_mail_smtp_module_ctx, /* module context */
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100 ngx_mail_smtp_commands, /* module directives */
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101 NGX_MAIL_MODULE, /* module type */
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102 NULL, /* init master */
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103 NULL, /* init module */
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104 NULL, /* init process */
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105 NULL, /* init thread */
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106 NULL, /* exit thread */
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107 NULL, /* exit process */
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108 NULL, /* exit master */
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109 NGX_MODULE_V1_PADDING
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110 };
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111
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112
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113 static void *
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114 ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf)
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115 {
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116 ngx_mail_smtp_srv_conf_t *sscf;
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117
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118 sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t));
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119 if (sscf == NULL) {
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120 return NULL;
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121 }
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122
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123 sscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
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124 sscf->greeting_delay = NGX_CONF_UNSET_MSEC;
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125
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126 if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
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127 != NGX_OK)
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128 {
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129 return NULL;
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130 }
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131
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132 return sscf;
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133 }
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134
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135
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136 static char *
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137 ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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138 {
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139 ngx_mail_smtp_srv_conf_t *prev = parent;
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140 ngx_mail_smtp_srv_conf_t *conf = child;
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141
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420
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142 u_char *p, *auth, *last;
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143 size_t size;
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144 ngx_str_t *c;
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420
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145 ngx_uint_t i, m, auth_enabled;
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336
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146 ngx_mail_core_srv_conf_t *cscf;
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147
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148 ngx_conf_merge_size_value(conf->client_buffer_size,
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149 prev->client_buffer_size,
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150 (size_t) ngx_pagesize);
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151
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152 ngx_conf_merge_msec_value(conf->greeting_delay,
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153 prev->greeting_delay, 0);
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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
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159 |NGX_MAIL_AUTH_LOGIN_ENABLED));
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160
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161
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162 cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module);
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163
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164 size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len;
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165
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382
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166 p = ngx_pnalloc(cf->pool, size);
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167 if (p == NULL) {
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168 return NGX_CONF_ERROR;
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169 }
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170
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171 conf->greeting.len = size;
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172 conf->greeting.data = p;
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173
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174 *p++ = '2'; *p++ = '2'; *p++ = '0'; *p++ = ' ';
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175 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
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176 ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1);
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177
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178
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179 size = sizeof("250 " CRLF) - 1 + cscf->server_name.len;
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180
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382
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181 p = ngx_pnalloc(cf->pool, size);
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182 if (p == NULL) {
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183 return NGX_CONF_ERROR;
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184 }
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185
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186 conf->server_name.len = size;
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187 conf->server_name.data = p;
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188
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189 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' ';
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190 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
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191 *p++ = CR; *p = LF;
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192
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193
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194 if (conf->capabilities.nelts == 0) {
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195 conf->capabilities = prev->capabilities;
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196 }
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197
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420
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198 size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1;
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336
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199
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200 c = conf->capabilities.elts;
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201 for (i = 0; i < conf->capabilities.nelts; i++) {
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202 size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1;
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203 }
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204
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420
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205 auth_enabled = 0;
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206
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336
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207 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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208 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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209 m <<= 1, i++)
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210 {
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211 if (m & conf->auth_methods) {
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212 size += 1 + ngx_mail_smtp_auth_methods_names[i].len;
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420
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213 auth_enabled = 1;
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336
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214 }
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215 }
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216
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420
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217 if (auth_enabled) {
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218 size += sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1;
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219 }
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220
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221 p = ngx_pnalloc(cf->pool, size);
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222 if (p == NULL) {
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223 return NGX_CONF_ERROR;
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224 }
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225
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226 conf->capability.len = size;
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227 conf->capability.data = p;
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228
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420
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229 last = p;
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230
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336
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231 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-';
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232 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
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233 *p++ = CR; *p++ = LF;
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234
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235 for (i = 0; i < conf->capabilities.nelts; i++) {
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236 last = p;
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237 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-';
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238 p = ngx_cpymem(p, c[i].data, c[i].len);
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239 *p++ = CR; *p++ = LF;
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240 }
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241
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242 auth = p;
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243
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420
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244 if (auth_enabled) {
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245 last = p;
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246
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247 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' ';
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248 *p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H';
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336
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249
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420
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250 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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251 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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252 m <<= 1, i++)
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253 {
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254 if (m & conf->auth_methods) {
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255 *p++ = ' ';
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256 p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data,
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257 ngx_mail_smtp_auth_methods_names[i].len);
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258 }
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336
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259 }
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420
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260
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261 *p++ = CR; *p = LF;
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336
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262
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420
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263 } else {
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264 last[3] = ' ';
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265 }
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336
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266
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267 size += sizeof("250 STARTTLS" CRLF) - 1;
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268
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382
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269 p = ngx_pnalloc(cf->pool, size);
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270 if (p == NULL) {
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271 return NGX_CONF_ERROR;
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272 }
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273
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274 conf->starttls_capability.len = size;
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275 conf->starttls_capability.data = p;
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276
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420
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277 p = ngx_cpymem(p, conf->capability.data, conf->capability.len);
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336
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278
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279 p = ngx_cpymem(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
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280 *p++ = CR; *p = LF;
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281
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282 p = conf->starttls_capability.data
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420
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283 + (last - conf->capability.data) + 3;
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284 *p = '-';
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285
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286 size = (auth - conf->capability.data)
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287 + sizeof("250 STARTTLS" CRLF) - 1;
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288
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382
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289 p = ngx_pnalloc(cf->pool, size);
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336
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290 if (p == NULL) {
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291 return NGX_CONF_ERROR;
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292 }
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293
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294 conf->starttls_only_capability.len = size;
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295 conf->starttls_only_capability.data = p;
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296
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420
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297 p = ngx_cpymem(p, conf->capability.data, auth - conf->capability.data);
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336
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298
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299 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
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300
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420
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301 if (last < auth) {
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302 p = conf->starttls_only_capability.data
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303 + (last - conf->capability.data) + 3;
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304 *p = '-';
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305 }
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306
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336
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307 return NGX_CONF_OK;
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308 }
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