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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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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10 #include <ngx_mail.h>
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11 #include <ngx_mail_smtp_module.h>
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12
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13
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14 static void *ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf);
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15 static char *ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent,
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16 void *child);
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17
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18
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19 static ngx_conf_bitmask_t ngx_mail_smtp_auth_methods[] = {
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20 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
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21 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_ENABLED },
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22 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
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23 { ngx_null_string, 0 }
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24 };
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25
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26
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27 static ngx_str_t ngx_mail_smtp_auth_methods_names[] = {
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28 ngx_string("PLAIN"),
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29 ngx_string("LOGIN"),
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30 ngx_null_string, /* APOP */
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31 ngx_string("CRAM-MD5")
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32 };
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33
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34
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35 static ngx_mail_protocol_t ngx_mail_smtp_protocol = {
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36 ngx_string("smtp"),
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37 { 25, 465, 587, 0 },
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38 NGX_MAIL_SMTP_PROTOCOL,
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39
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40 ngx_mail_smtp_init_session,
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41 ngx_mail_smtp_init_protocol,
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42 ngx_mail_smtp_parse_command,
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43 ngx_mail_smtp_auth_state,
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44
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45 ngx_string("451 4.3.2 Internal server error" CRLF)
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46 };
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47
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48
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49 static ngx_command_t ngx_mail_smtp_commands[] = {
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50
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51 { ngx_string("smtp_client_buffer"),
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52 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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53 ngx_conf_set_size_slot,
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54 NGX_MAIL_SRV_CONF_OFFSET,
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55 offsetof(ngx_mail_smtp_srv_conf_t, client_buffer_size),
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56 NULL },
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57
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58 { ngx_string("smtp_greeting_delay"),
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59 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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60 ngx_conf_set_msec_slot,
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61 NGX_MAIL_SRV_CONF_OFFSET,
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62 offsetof(ngx_mail_smtp_srv_conf_t, greeting_delay),
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63 NULL },
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64
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65 { ngx_string("smtp_capabilities"),
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66 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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67 ngx_mail_capabilities,
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68 NGX_MAIL_SRV_CONF_OFFSET,
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69 offsetof(ngx_mail_smtp_srv_conf_t, capabilities),
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70 NULL },
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71
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72 { ngx_string("smtp_auth"),
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73 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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74 ngx_conf_set_bitmask_slot,
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75 NGX_MAIL_SRV_CONF_OFFSET,
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76 offsetof(ngx_mail_smtp_srv_conf_t, auth_methods),
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77 &ngx_mail_smtp_auth_methods },
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78
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79 ngx_null_command
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80 };
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81
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82
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83 static ngx_mail_module_t ngx_mail_smtp_module_ctx = {
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84 &ngx_mail_smtp_protocol, /* protocol */
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85
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86 NULL, /* create main configuration */
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87 NULL, /* init main configuration */
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88
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89 ngx_mail_smtp_create_srv_conf, /* create server configuration */
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90 ngx_mail_smtp_merge_srv_conf /* merge server configuration */
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91 };
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92
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93
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94 ngx_module_t ngx_mail_smtp_module = {
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95 NGX_MODULE_V1,
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96 &ngx_mail_smtp_module_ctx, /* module context */
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97 ngx_mail_smtp_commands, /* module directives */
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98 NGX_MAIL_MODULE, /* module type */
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99 NULL, /* init master */
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100 NULL, /* init module */
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101 NULL, /* init process */
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102 NULL, /* init thread */
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103 NULL, /* exit thread */
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104 NULL, /* exit process */
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105 NULL, /* exit master */
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106 NGX_MODULE_V1_PADDING
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107 };
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108
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109
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110 static void *
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111 ngx_mail_smtp_create_srv_conf(ngx_conf_t *cf)
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112 {
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113 ngx_mail_smtp_srv_conf_t *sscf;
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114
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115 sscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_smtp_srv_conf_t));
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116 if (sscf == NULL) {
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117 return NULL;
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118 }
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119
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120 sscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
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121 sscf->greeting_delay = NGX_CONF_UNSET_MSEC;
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122
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123 if (ngx_array_init(&sscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
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124 != NGX_OK)
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125 {
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126 return NULL;
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127 }
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128
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129 return sscf;
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130 }
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131
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132
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133 static char *
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134 ngx_mail_smtp_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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135 {
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136 ngx_mail_smtp_srv_conf_t *prev = parent;
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137 ngx_mail_smtp_srv_conf_t *conf = child;
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138
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139 u_char *p, *auth;
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140 size_t size;
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141 ngx_str_t *c;
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142 ngx_uint_t i, m;
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143 ngx_mail_core_srv_conf_t *cscf;
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144
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145 ngx_conf_merge_size_value(conf->client_buffer_size,
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146 prev->client_buffer_size,
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147 (size_t) ngx_pagesize);
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148
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149 ngx_conf_merge_msec_value(conf->greeting_delay,
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150 prev->greeting_delay, 0);
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151
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152 ngx_conf_merge_bitmask_value(conf->auth_methods,
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153 prev->auth_methods,
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154 (NGX_CONF_BITMASK_SET
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155 |NGX_MAIL_AUTH_PLAIN_ENABLED
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156 |NGX_MAIL_AUTH_LOGIN_ENABLED));
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157
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158
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159 cscf = ngx_mail_conf_get_module_srv_conf(cf, ngx_mail_core_module);
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160
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161 size = sizeof("220 ESMTP ready" CRLF) - 1 + cscf->server_name.len;
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162
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163 p = ngx_palloc(cf->pool, size);
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164 if (p == NULL) {
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165 return NGX_CONF_ERROR;
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166 }
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167
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168 conf->greeting.len = size;
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169 conf->greeting.data = p;
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170
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171 *p++ = '2'; *p++ = '2'; *p++ = '0'; *p++ = ' ';
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172 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
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173 ngx_memcpy(p, " ESMTP ready" CRLF, sizeof(" ESMTP ready" CRLF) - 1);
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174
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175
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176 size = sizeof("250 " CRLF) - 1 + cscf->server_name.len;
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177
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178 p = ngx_palloc(cf->pool, size);
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179 if (p == NULL) {
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180 return NGX_CONF_ERROR;
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181 }
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182
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183 conf->server_name.len = size;
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184 conf->server_name.data = p;
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185
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186 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' ';
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187 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
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188 *p++ = CR; *p = LF;
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189
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190
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191 if (conf->capabilities.nelts == 0) {
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192 conf->capabilities = prev->capabilities;
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193 }
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194
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195 size = sizeof("250-") - 1 + cscf->server_name.len + sizeof(CRLF) - 1
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196 + sizeof("250 AUTH") - 1 + sizeof(CRLF) - 1;
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197
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198 c = conf->capabilities.elts;
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199 for (i = 0; i < conf->capabilities.nelts; i++) {
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200 size += sizeof("250 ") - 1 + c[i].len + sizeof(CRLF) - 1;
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201 }
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202
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203 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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204 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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205 m <<= 1, i++)
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206 {
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207 if (m & conf->auth_methods) {
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208 size += 1 + ngx_mail_smtp_auth_methods_names[i].len;
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209 }
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210 }
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211
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212 p = ngx_palloc(cf->pool, size);
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213 if (p == NULL) {
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214 return NGX_CONF_ERROR;
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215 }
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216
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217 conf->capability.len = size;
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218 conf->capability.data = p;
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219
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220 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-';
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221 p = ngx_cpymem(p, cscf->server_name.data, cscf->server_name.len);
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222 *p++ = CR; *p++ = LF;
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223
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224 for (i = 0; i < conf->capabilities.nelts; i++) {
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225 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = '-';
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226 p = ngx_cpymem(p, c[i].data, c[i].len);
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227 *p++ = CR; *p++ = LF;
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228 }
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229
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230 auth = p;
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231
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232 *p++ = '2'; *p++ = '5'; *p++ = '0'; *p++ = ' ';
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233 *p++ = 'A'; *p++ = 'U'; *p++ = 'T'; *p++ = 'H';
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234
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235 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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236 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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237 m <<= 1, i++)
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238 {
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239 if (m & conf->auth_methods) {
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240 *p++ = ' ';
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241 p = ngx_cpymem(p, ngx_mail_smtp_auth_methods_names[i].data,
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242 ngx_mail_smtp_auth_methods_names[i].len);
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243 }
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244 }
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245
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246 *p++ = CR; *p = LF;
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247
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248 size += sizeof("250 STARTTLS" CRLF) - 1;
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249
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250 p = ngx_palloc(cf->pool, size);
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251 if (p == NULL) {
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252 return NGX_CONF_ERROR;
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253 }
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254
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255 conf->starttls_capability.len = size;
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256 conf->starttls_capability.data = p;
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257
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258 p = ngx_cpymem(p, conf->capability.data,
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259 conf->capability.len);
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260
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261 p = ngx_cpymem(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
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262 *p++ = CR; *p = LF;
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263
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264 p = conf->starttls_capability.data
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265 + (auth - conf->capability.data) + 3;
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266 *p = '-';
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267
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268 size = (auth - conf->capability.data)
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269 + sizeof("250 STARTTLS" CRLF) - 1;
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270
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271 p = ngx_palloc(cf->pool, size);
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272 if (p == NULL) {
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273 return NGX_CONF_ERROR;
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274 }
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275
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276 conf->starttls_only_capability.len = size;
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277 conf->starttls_only_capability.data = p;
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278
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279 p = ngx_cpymem(p, conf->capability.data,
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280 auth - conf->capability.data);
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281
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282 ngx_memcpy(p, "250 STARTTLS" CRLF, sizeof("250 STARTTLS" CRLF) - 1);
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283
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284 return NGX_CONF_OK;
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285 }
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