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