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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_pop3_module.h>
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12
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13
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14 static void *ngx_mail_pop3_create_srv_conf(ngx_conf_t *cf);
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15 static char *ngx_mail_pop3_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_str_t ngx_mail_pop3_default_capabilities[] = {
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20 ngx_string("TOP"),
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21 ngx_string("USER"),
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22 ngx_string("UIDL"),
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23 ngx_null_string
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24 };
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25
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26
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27 static ngx_conf_bitmask_t ngx_mail_pop3_auth_methods[] = {
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28 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
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29 { ngx_string("apop"), NGX_MAIL_AUTH_APOP_ENABLED },
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30 { ngx_string("cram-md5"), NGX_MAIL_AUTH_CRAM_MD5_ENABLED },
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31 { ngx_null_string, 0 }
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32 };
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33
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34
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35 static ngx_str_t ngx_mail_pop3_auth_plain_capability =
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36 ngx_string("+OK methods supported:" CRLF
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37 "LOGIN" CRLF
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38 "PLAIN" CRLF
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39 "." CRLF);
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40
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41
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42 static ngx_str_t ngx_mail_pop3_auth_cram_md5_capability =
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43 ngx_string("+OK methods supported:" CRLF
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44 "LOGIN" CRLF
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45 "PLAIN" CRLF
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46 "CRAM-MD5" CRLF
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47 "." CRLF);
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48
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49
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50 static ngx_mail_protocol_t ngx_mail_pop3_protocol = {
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51 ngx_string("pop3"),
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52 { 110, 995, 0, 0 },
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53 NGX_MAIL_POP3_PROTOCOL,
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54
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55 ngx_mail_pop3_init_session,
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56 ngx_mail_pop3_init_protocol,
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57 ngx_mail_pop3_parse_command,
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58 ngx_mail_pop3_auth_state,
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59
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60 ngx_string("-ERR internal server error" CRLF)
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61 };
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62
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63
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64 static ngx_command_t ngx_mail_pop3_commands[] = {
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65
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66 { ngx_string("pop3_capabilities"),
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67 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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68 ngx_mail_capabilities,
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69 NGX_MAIL_SRV_CONF_OFFSET,
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70 offsetof(ngx_mail_pop3_srv_conf_t, capabilities),
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71 NULL },
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72
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73 { ngx_string("pop3_auth"),
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74 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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75 ngx_conf_set_bitmask_slot,
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76 NGX_MAIL_SRV_CONF_OFFSET,
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77 offsetof(ngx_mail_pop3_srv_conf_t, auth_methods),
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78 &ngx_mail_pop3_auth_methods },
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79
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80 ngx_null_command
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81 };
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82
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83
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84 static ngx_mail_module_t ngx_mail_pop3_module_ctx = {
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85 &ngx_mail_pop3_protocol, /* protocol */
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86
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87 NULL, /* create main configuration */
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88 NULL, /* init main configuration */
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89
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90 ngx_mail_pop3_create_srv_conf, /* create server configuration */
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91 ngx_mail_pop3_merge_srv_conf /* merge server configuration */
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92 };
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93
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94
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95 ngx_module_t ngx_mail_pop3_module = {
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96 NGX_MODULE_V1,
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97 &ngx_mail_pop3_module_ctx, /* module context */
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98 ngx_mail_pop3_commands, /* module directives */
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99 NGX_MAIL_MODULE, /* module type */
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100 NULL, /* init master */
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101 NULL, /* init module */
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102 NULL, /* init process */
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103 NULL, /* init thread */
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104 NULL, /* exit thread */
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105 NULL, /* exit process */
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106 NULL, /* exit master */
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107 NGX_MODULE_V1_PADDING
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108 };
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109
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110
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111 static void *
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112 ngx_mail_pop3_create_srv_conf(ngx_conf_t *cf)
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113 {
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114 ngx_mail_pop3_srv_conf_t *pscf;
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115
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116 pscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_pop3_srv_conf_t));
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117 if (pscf == NULL) {
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118 return NULL;
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119 }
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120
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121 if (ngx_array_init(&pscf->capabilities, cf->pool, 4, sizeof(ngx_str_t))
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122 != NGX_OK)
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123 {
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124 return NULL;
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125 }
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126
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127 return pscf;
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128 }
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129
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130
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131 static char *
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132 ngx_mail_pop3_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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133 {
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134 ngx_mail_pop3_srv_conf_t *prev = parent;
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135 ngx_mail_pop3_srv_conf_t *conf = child;
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136
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137 u_char *p;
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138 size_t size, stls_only_size;
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139 ngx_str_t *c, *d;
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140 ngx_uint_t i;
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141
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142 ngx_conf_merge_bitmask_value(conf->auth_methods,
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143 prev->auth_methods,
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144 (NGX_CONF_BITMASK_SET
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145 |NGX_MAIL_AUTH_PLAIN_ENABLED));
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146
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147 if (conf->capabilities.nelts == 0) {
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148 conf->capabilities = prev->capabilities;
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149 }
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150
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151 if (conf->capabilities.nelts == 0) {
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152
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153 for (d = ngx_mail_pop3_default_capabilities; d->len; d++) {
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154 c = ngx_array_push(&conf->capabilities);
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155 if (c == NULL) {
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156 return NGX_CONF_ERROR;
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157 }
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158
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159 *c = *d;
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160 }
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161 }
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162
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163 size = sizeof("+OK Capability list follows" CRLF) - 1
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164 + sizeof("." CRLF) - 1;
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165
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166 stls_only_size = size + sizeof("STLS" CRLF) - 1;
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167
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168 c = conf->capabilities.elts;
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169 for (i = 0; i < conf->capabilities.nelts; i++) {
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170 size += c[i].len + sizeof(CRLF) - 1;
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171
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172 if (ngx_strcasecmp(c[i].data, (u_char *) "USER") == 0) {
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173 continue;
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174 }
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175
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176 stls_only_size += c[i].len + sizeof(CRLF) - 1;
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177 }
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178
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179 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
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180 size += sizeof("SASL LOGIN PLAIN CRAM-MD5" CRLF) - 1;
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181
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182 } else {
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183 size += sizeof("SASL LOGIN PLAIN" CRLF) - 1;
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184 }
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185
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382
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186 p = ngx_pnalloc(cf->pool, size);
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336
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187 if (p == NULL) {
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188 return NGX_CONF_ERROR;
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189 }
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190
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191 conf->capability.len = size;
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192 conf->capability.data = p;
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193
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194 p = ngx_cpymem(p, "+OK Capability list follows" CRLF,
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195 sizeof("+OK Capability list follows" CRLF) - 1);
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196
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197 for (i = 0; i < conf->capabilities.nelts; i++) {
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198 p = ngx_cpymem(p, c[i].data, c[i].len);
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199 *p++ = CR; *p++ = LF;
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200 }
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201
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202 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
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203 p = ngx_cpymem(p, "SASL LOGIN PLAIN CRAM-MD5" CRLF,
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204 sizeof("SASL LOGIN PLAIN CRAM-MD5" CRLF) - 1);
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205
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206 } else {
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207 p = ngx_cpymem(p, "SASL LOGIN PLAIN" CRLF,
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208 sizeof("SASL LOGIN PLAIN" CRLF) - 1);
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209 }
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210
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211 *p++ = '.'; *p++ = CR; *p = LF;
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212
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213
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214 size += sizeof("STLS" CRLF) - 1;
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215
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382
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216 p = ngx_pnalloc(cf->pool, size);
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217 if (p == NULL) {
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218 return NGX_CONF_ERROR;
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219 }
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220
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221 conf->starttls_capability.len = size;
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222 conf->starttls_capability.data = p;
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223
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224 p = ngx_cpymem(p, conf->capability.data,
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225 conf->capability.len - (sizeof("." CRLF) - 1));
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226
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227 p = ngx_cpymem(p, "STLS" CRLF, sizeof("STLS" CRLF) - 1);
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228 *p++ = '.'; *p++ = CR; *p = LF;
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229
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230
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231 if (conf->auth_methods & NGX_MAIL_AUTH_CRAM_MD5_ENABLED) {
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232 conf->auth_capability = ngx_mail_pop3_auth_cram_md5_capability;
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233
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234 } else {
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235 conf->auth_capability = ngx_mail_pop3_auth_plain_capability;
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236 }
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237
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238
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382
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239 p = ngx_pnalloc(cf->pool, stls_only_size);
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336
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240 if (p == NULL) {
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241 return NGX_CONF_ERROR;
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242 }
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243
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244 conf->starttls_only_capability.len = stls_only_size;
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245 conf->starttls_only_capability.data = p;
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246
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247 p = ngx_cpymem(p, "+OK Capability list follows" CRLF,
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248 sizeof("+OK Capability list follows" CRLF) - 1);
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249
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250 for (i = 0; i < conf->capabilities.nelts; i++) {
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251 if (ngx_strcasecmp(c[i].data, (u_char *) "USER") == 0) {
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252 continue;
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253 }
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254
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255 p = ngx_cpymem(p, c[i].data, c[i].len);
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256 *p++ = CR; *p++ = LF;
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257 }
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258
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259 p = ngx_cpymem(p, "STLS" CRLF, sizeof("STLS" CRLF) - 1);
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260 *p++ = '.'; *p++ = CR; *p = LF;
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261
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262 return NGX_CONF_OK;
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263 }
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