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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_imap_module.h>
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13
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14
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15 static void *ngx_mail_imap_create_srv_conf(ngx_conf_t *cf);
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16 static char *ngx_mail_imap_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_imap_default_capabilities[] = {
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21 ngx_string("IMAP4"),
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22 ngx_string("IMAP4rev1"),
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23 ngx_string("UIDPLUS"),
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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_imap_auth_methods[] = {
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29 { ngx_string("plain"), NGX_MAIL_AUTH_PLAIN_ENABLED },
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30 { ngx_string("login"), NGX_MAIL_AUTH_LOGIN_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_imap_auth_methods_names[] = {
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37 ngx_string("AUTH=PLAIN"),
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38 ngx_string("AUTH=LOGIN"),
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39 ngx_null_string, /* APOP */
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420
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40 ngx_string("AUTH=CRAM-MD5"),
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41 ngx_null_string /* NONE */
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336
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42 };
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43
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44
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45 static ngx_mail_protocol_t ngx_mail_imap_protocol = {
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46 ngx_string("imap"),
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47 { 143, 993, 0, 0 },
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48 NGX_MAIL_IMAP_PROTOCOL,
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49
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50 ngx_mail_imap_init_session,
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51 ngx_mail_imap_init_protocol,
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52 ngx_mail_imap_parse_command,
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53 ngx_mail_imap_auth_state,
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54
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55 ngx_string("* BAD internal server error" CRLF)
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56 };
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57
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58
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59 static ngx_command_t ngx_mail_imap_commands[] = {
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60
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61 { ngx_string("imap_client_buffer"),
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62 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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63 ngx_conf_set_size_slot,
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64 NGX_MAIL_SRV_CONF_OFFSET,
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65 offsetof(ngx_mail_imap_srv_conf_t, client_buffer_size),
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66 NULL },
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67
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68 { ngx_string("imap_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_imap_srv_conf_t, capabilities),
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73 NULL },
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74
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75 { ngx_string("imap_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_imap_srv_conf_t, auth_methods),
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80 &ngx_mail_imap_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_imap_module_ctx = {
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87 &ngx_mail_imap_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_imap_create_srv_conf, /* create server configuration */
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93 ngx_mail_imap_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_imap_module = {
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98 NGX_MODULE_V1,
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99 &ngx_mail_imap_module_ctx, /* module context */
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100 ngx_mail_imap_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_imap_create_srv_conf(ngx_conf_t *cf)
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115 {
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116 ngx_mail_imap_srv_conf_t *iscf;
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117
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118 iscf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_imap_srv_conf_t));
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119 if (iscf == NULL) {
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120 return NULL;
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121 }
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122
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123 iscf->client_buffer_size = NGX_CONF_UNSET_SIZE;
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124
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125 if (ngx_array_init(&iscf->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 iscf;
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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_imap_merge_srv_conf(ngx_conf_t *cf, void *parent, void *child)
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137 {
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138 ngx_mail_imap_srv_conf_t *prev = parent;
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139 ngx_mail_imap_srv_conf_t *conf = child;
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140
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141 u_char *p, *auth;
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142 size_t size;
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143 ngx_str_t *c, *d;
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144 ngx_uint_t i, m;
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145
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146 ngx_conf_merge_size_value(conf->client_buffer_size,
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147 prev->client_buffer_size,
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148 (size_t) ngx_pagesize);
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149
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150 ngx_conf_merge_bitmask_value(conf->auth_methods,
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151 prev->auth_methods,
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152 (NGX_CONF_BITMASK_SET
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153 |NGX_MAIL_AUTH_PLAIN_ENABLED));
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154
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155
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156 if (conf->capabilities.nelts == 0) {
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157 conf->capabilities = prev->capabilities;
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158 }
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159
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160 if (conf->capabilities.nelts == 0) {
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161
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162 for (d = ngx_mail_imap_default_capabilities; d->len; d++) {
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163 c = ngx_array_push(&conf->capabilities);
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164 if (c == 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 *c = *d;
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169 }
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170 }
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171
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172 size = sizeof("* CAPABILITY" CRLF) - 1;
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173
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174 c = conf->capabilities.elts;
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175 for (i = 0; i < conf->capabilities.nelts; i++) {
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176 size += 1 + c[i].len;
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177 }
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178
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179 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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180 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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181 m <<= 1, i++)
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182 {
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183 if (m & conf->auth_methods) {
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184 size += 1 + ngx_mail_imap_auth_methods_names[i].len;
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185 }
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186 }
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187
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188 p = ngx_pnalloc(cf->pool, size);
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189 if (p == NULL) {
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190 return NGX_CONF_ERROR;
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191 }
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192
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193 conf->capability.len = size;
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194 conf->capability.data = p;
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195
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196 p = ngx_cpymem(p, "* CAPABILITY", sizeof("* CAPABILITY") - 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++ = ' ';
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200 p = ngx_cpymem(p, c[i].data, c[i].len);
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201 }
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202
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203 auth = p;
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204
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205 for (m = NGX_MAIL_AUTH_PLAIN_ENABLED, i = 0;
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206 m <= NGX_MAIL_AUTH_CRAM_MD5_ENABLED;
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207 m <<= 1, i++)
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208 {
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209 if (m & conf->auth_methods) {
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210 *p++ = ' ';
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211 p = ngx_cpymem(p, ngx_mail_imap_auth_methods_names[i].data,
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212 ngx_mail_imap_auth_methods_names[i].len);
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213 }
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214 }
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215
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216 *p++ = CR; *p = LF;
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217
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218
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219 size += sizeof(" STARTTLS") - 1;
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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->starttls_capability.len = size;
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227 conf->starttls_capability.data = p;
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228
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229 p = ngx_cpymem(p, conf->capability.data,
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230 conf->capability.len - (sizeof(CRLF) - 1));
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231 p = ngx_cpymem(p, " STARTTLS", sizeof(" STARTTLS") - 1);
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232 *p++ = CR; *p = LF;
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233
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234
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235 size = (auth - conf->capability.data) + sizeof(CRLF) - 1
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236 + sizeof(" STARTTLS LOGINDISABLED") - 1;
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237
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238 p = ngx_pnalloc(cf->pool, size);
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239 if (p == NULL) {
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240 return NGX_CONF_ERROR;
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241 }
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242
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243 conf->starttls_only_capability.len = size;
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244 conf->starttls_only_capability.data = p;
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245
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246 p = ngx_cpymem(p, conf->capability.data,
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247 auth - conf->capability.data);
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248 p = ngx_cpymem(p, " STARTTLS LOGINDISABLED",
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249 sizeof(" STARTTLS LOGINDISABLED") - 1);
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250 *p++ = CR; *p = LF;
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251
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252 return NGX_CONF_OK;
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253 }
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