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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_pop3_module.h>
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13
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14
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15 static void *ngx_mail_pop3_create_srv_conf(ngx_conf_t *cf);
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16 static char *ngx_mail_pop3_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_str_t ngx_mail_pop3_default_capabilities[] = {
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21 ngx_string("TOP"),
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22 ngx_string("USER"),
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23 ngx_string("UIDL"),
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24 ngx_null_string
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25 };
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26
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27
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28 static ngx_conf_bitmask_t ngx_mail_pop3_auth_methods[] = {
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29 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
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30 { ngx_string("apop"), NGX_MAIL_AUTH_APOP_ENABLED },
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31 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
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32 { ngx_null_string, 0 }
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33 };
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34
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35
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36 static ngx_str_t ngx_mail_pop3_auth_plain_capability =
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37 ngx_string("+OK methods supported:" CRLF
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38 "LOGIN" CRLF
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39 "PLAIN" CRLF
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40 "." CRLF);
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41
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42
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43 static ngx_str_t ngx_mail_pop3_auth_cram_md5_capability =
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44 ngx_string("+OK methods supported:" CRLF
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45 "LOGIN" CRLF
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46 "PLAIN" CRLF
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47 "CRAM-MD5" CRLF
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48 "." CRLF);
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49
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50
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51 static ngx_mail_protocol_t ngx_mail_pop3_protocol = {
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52 ngx_string("pop3"),
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53 { 110, 995, 0, 0 },
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54 NGX_MAIL_POP3_PROTOCOL,
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55
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56 ngx_mail_pop3_init_session,
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57 ngx_mail_pop3_init_protocol,
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58 ngx_mail_pop3_parse_command,
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59 ngx_mail_pop3_auth_state,
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60
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61 ngx_string("-ERR internal server error" CRLF)
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62 };
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63
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64
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65 static ngx_command_t ngx_mail_pop3_commands[] = {
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66
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67 { ngx_string("pop3_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_pop3_srv_conf_t, capabilities),
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72 NULL },
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73
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74 { ngx_string("pop3_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_pop3_srv_conf_t, auth_methods),
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79 &ngx_mail_pop3_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_pop3_module_ctx = {
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86 &ngx_mail_pop3_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_pop3_create_srv_conf, /* create server configuration */
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92 ngx_mail_pop3_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_pop3_module = {
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97 NGX_MODULE_V1,
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98 &ngx_mail_pop3_module_ctx, /* module context */
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99 ngx_mail_pop3_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_pop3_create_srv_conf(ngx_conf_t *cf)
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114 {
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115 ngx_mail_pop3_srv_conf_t *pscf;
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116
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117 pscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_pop3_srv_conf_t));
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118 if (pscf == NULL) {
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119 return NULL;
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120 }
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121
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122 if (ngx_array_init(&pscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
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123 != NGX_OK)
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124 {
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125 return NULL;
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126 }
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127
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128 return pscf;
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129 }
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130
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131
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132 static char *
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133 ngx_mail_pop3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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134 {
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135 ngx_mail_pop3_srv_conf_t *prev = parent;
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136 ngx_mail_pop3_srv_conf_t *conf = child;
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137
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138 u_char *p;
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139 size_t size, stls_only_size;
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140 ngx_str_t *c, *d;
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141 ngx_uint_t i;
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142
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143 ngx_conf_merge_bitmask_value(conf->auth_methods,
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144 prev->auth_methods,
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145 (NGX_CONF_BITMASK_SET
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146 |NGX_MAIL_AUTH_PLAIN_ENABLED));
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147
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148 if (conf->capabilities.nelts == 0) {
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149 conf->capabilities = prev->capabilities;
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150 }
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151
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152 if (conf->capabilities.nelts == 0) {
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153
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154 for (d = ngx_mail_pop3_default_capabilities; d->len; d++) {
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155 c = ngx_array_push(&conf->capabilities);
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156 if (c == NULL) {
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157 return NGX_CONF_ERROR;
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158 }
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159
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160 *c = *d;
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161 }
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162 }
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163
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164 size = sizeof("+OK Capability list follows" CRLF) - 1
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165 + sizeof("." CRLF) - 1;
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166
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167 stls_only_size = size + sizeof("STLS" CRLF) - 1;
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168
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169 c = conf->capabilities.elts;
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170 for (i = 0; i < conf->capabilities.nelts; i++) {
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171 size += c[i].len + sizeof(CRLF) - 1;
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172
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173 if (ngx_strcasecmp(c[i].data, (u_char *) "USER") == 0) {
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174 continue;
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175 }
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176
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177 stls_only_size += c[i].len + sizeof(CRLF) - 1;
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178 }
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179
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180 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
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181 size += sizeof("SASL LOGIN PLAIN CRAM-MD5" CRLF) - 1;
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182
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183 } else {
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184 size += sizeof("SASL LOGIN PLAIN" CRLF) - 1;
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185 }
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186
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382
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187 p = ngx_pnalloc(cf->pool, size);
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188 if (p == NULL) {
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189 return NGX_CONF_ERROR;
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190 }
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191
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192 conf->capability.len = size;
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193 conf->capability.data = p;
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194
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195 p = ngx_cpymem(p, "+OK Capability list follows" CRLF,
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196 sizeof("+OK Capability list follows" CRLF) - 1);
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197
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198 for (i = 0; i < conf->capabilities.nelts; i++) {
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199 p = ngx_cpymem(p, c[i].data, c[i].len);
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200 *p++ = CR; *p++ = LF;
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201 }
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202
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203 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
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204 p = ngx_cpymem(p, "SASL LOGIN PLAIN CRAM-MD5" CRLF,
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205 sizeof("SASL LOGIN PLAIN CRAM-MD5" CRLF) - 1);
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206
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207 } else {
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208 p = ngx_cpymem(p, "SASL LOGIN PLAIN" CRLF,
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209 sizeof("SASL LOGIN PLAIN" CRLF) - 1);
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210 }
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211
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212 *p++ = '.'; *p++ = CR; *p = LF;
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213
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214
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215 size += sizeof("STLS" CRLF) - 1;
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216
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217 p = ngx_pnalloc(cf->pool, size);
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218 if (p == NULL) {
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219 return NGX_CONF_ERROR;
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220 }
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221
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222 conf->starttls_capability.len = size;
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223 conf->starttls_capability.data = p;
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224
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225 p = ngx_cpymem(p, conf->capability.data,
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226 conf->capability.len - (sizeof("." CRLF) - 1));
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227
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228 p = ngx_cpymem(p, "STLS" CRLF, sizeof("STLS" CRLF) - 1);
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229 *p++ = '.'; *p++ = CR; *p = LF;
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230
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231
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232 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
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233 conf->auth_capability = ngx_mail_pop3_auth_cram_md5_capability;
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234
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235 } else {
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236 conf->auth_capability = ngx_mail_pop3_auth_plain_capability;
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237 }
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238
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239
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382
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240 p = ngx_pnalloc(cf->pool, stls_only_size);
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241 if (p == NULL) {
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242 return NGX_CONF_ERROR;
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243 }
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244
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245 conf->starttls_only_capability.len = stls_only_size;
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246 conf->starttls_only_capability.data = p;
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247
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248 p = ngx_cpymem(p, "+OK Capability list follows" CRLF,
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249 sizeof("+OK Capability list follows" CRLF) - 1);
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250
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251 for (i = 0; i < conf->capabilities.nelts; i++) {
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252 if (ngx_strcasecmp(c[i].data, (u_char *) "USER") == 0) {
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253 continue;
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254 }
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255
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256 p = ngx_cpymem(p, c[i].data, c[i].len);
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257 *p++ = CR; *p++ = LF;
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258 }
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259
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260 p = ngx_cpymem(p, "STLS" CRLF, sizeof("STLS" CRLF) - 1);
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261 *p++ = '.'; *p++ = CR; *p = LF;
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262
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263 return NGX_CONF_OK;
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264 }
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