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539
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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_imap.h>
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10
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11
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12 #define NGX_DEFLAUT_CERTIFICATE "cert.pem"
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13 #define NGX_DEFLAUT_CERTIFICATE_KEY "cert.pem"
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547
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14 #define NGX_DEFLAUT_CIPHERS "ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP"
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539
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15
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16
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17 static void *ngx_imap_ssl_create_conf(ngx_conf_t *cf);
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18 static char *ngx_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child);
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19
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20
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21 static ngx_conf_bitmask_t ngx_imap_ssl_protocols[] = {
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22 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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23 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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24 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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25 { ngx_null_string, 0 }
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26 };
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27
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28
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539
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29 static ngx_command_t ngx_imap_ssl_commands[] = {
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30
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31 { ngx_string("ssl"),
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32 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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33 ngx_conf_set_flag_slot,
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34 NGX_IMAP_SRV_CONF_OFFSET,
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35 offsetof(ngx_imap_ssl_conf_t, enable),
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36 NULL },
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37
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38 { ngx_string("ssl_certificate"),
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39 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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40 ngx_conf_set_str_slot,
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41 NGX_IMAP_SRV_CONF_OFFSET,
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42 offsetof(ngx_imap_ssl_conf_t, certificate),
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43 NULL },
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44
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45 { ngx_string("ssl_certificate_key"),
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46 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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47 ngx_conf_set_str_slot,
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48 NGX_IMAP_SRV_CONF_OFFSET,
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49 offsetof(ngx_imap_ssl_conf_t, certificate_key),
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50 NULL },
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51
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547
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52 { ngx_string("ssl_protocols"),
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53 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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54 ngx_conf_set_bitmask_slot,
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55 NGX_IMAP_SRV_CONF_OFFSET,
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56 offsetof(ngx_imap_ssl_conf_t, protocols),
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57 &ngx_imap_ssl_protocols },
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58
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539
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59 { ngx_string("ssl_ciphers"),
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60 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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61 ngx_conf_set_str_slot,
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62 NGX_IMAP_SRV_CONF_OFFSET,
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63 offsetof(ngx_imap_ssl_conf_t, ciphers),
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64 NULL },
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65
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547
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66 { ngx_string("ssl_prefer_server_ciphers"),
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67 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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68 ngx_conf_set_flag_slot,
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69 NGX_IMAP_SRV_CONF_OFFSET,
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70 offsetof(ngx_imap_ssl_conf_t, prefer_server_ciphers),
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71 NULL },
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72
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539
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73 ngx_null_command
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74 };
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75
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76
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77 static ngx_imap_module_t ngx_imap_ssl_module_ctx = {
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78 NULL, /* create main configuration */
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79 NULL, /* init main configuration */
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80
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81 ngx_imap_ssl_create_conf, /* create server configuration */
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82 ngx_imap_ssl_merge_conf /* merge server configuration */
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83 };
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84
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85
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86 ngx_module_t ngx_imap_ssl_module = {
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87 NGX_MODULE_V1,
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88 &ngx_imap_ssl_module_ctx, /* module context */
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89 ngx_imap_ssl_commands, /* module directives */
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90 NGX_IMAP_MODULE, /* module type */
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541
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91 NULL, /* init master */
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539
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92 NULL, /* init module */
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541
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93 NULL, /* init process */
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94 NULL, /* init thread */
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95 NULL, /* exit thread */
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96 NULL, /* exit process */
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97 NULL, /* exit master */
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98 NGX_MODULE_V1_PADDING
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539
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99 };
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100
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101
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543
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102 static u_char ngx_imap_session_id_ctx[] = "IMAP";
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103
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104
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539
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105 static void *
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106 ngx_imap_ssl_create_conf(ngx_conf_t *cf)
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107 {
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108 ngx_imap_ssl_conf_t *scf;
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109
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110 scf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_ssl_conf_t));
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111 if (scf == NULL) {
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112 return NGX_CONF_ERROR;
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113 }
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114
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115 /*
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116 * set by ngx_pcalloc():
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117 *
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118 * scf->protocols = 0;
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119 *
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120 * scf->certificate.len = 0;
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121 * scf->certificate.data = NULL;
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122 * scf->certificate_key.len = 0;
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123 * scf->certificate_key.data = NULL;
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124 * scf->ciphers.len = 0;
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125 * scf->ciphers.data = NULL;
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126 */
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127
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128 scf->enable = NGX_CONF_UNSET;
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129 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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130
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131 return scf;
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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_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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137 {
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138 ngx_imap_ssl_conf_t *prev = parent;
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139 ngx_imap_ssl_conf_t *conf = child;
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140
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141 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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142
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143 if (conf->enable == 0) {
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144 return NGX_CONF_OK;
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145 }
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146
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547
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147 ngx_conf_merge_value(conf->prefer_server_ciphers,
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148 prev->prefer_server_ciphers, 0);
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149
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150 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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151 (NGX_CONF_BITMASK_SET
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152 |NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
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153
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539
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154 ngx_conf_merge_str_value(conf->certificate, prev->certificate,
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155 NGX_DEFLAUT_CERTIFICATE);
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156
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157 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
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158 NGX_DEFLAUT_CERTIFICATE_KEY);
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159
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547
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160 ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFLAUT_CIPHERS);
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161
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162
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163 conf->ssl.log = cf->log;
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164
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165 if (ngx_ssl_create(&conf->ssl, conf->protocols) != NGX_OK) {
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166 return NGX_CONF_ERROR;
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167 }
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168
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169 if (ngx_pool_cleanup_add(cf->pool, ngx_ssl_cleanup_ctx, &conf->ssl) == NULL)
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170 {
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171 return NGX_CONF_ERROR;
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172 }
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173
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174 if (ngx_ssl_certificate(&conf->ssl, conf->certificate.data,
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175 conf->certificate_key.data) != NGX_OK)
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176 {
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177 return NGX_CONF_ERROR;
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178 }
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539
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179
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180 if (conf->ciphers.len) {
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181 if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
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182 (const char *) conf->ciphers.data) == 0)
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183 {
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184 ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
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185 "SSL_CTX_set_cipher_list(\"%V\") failed",
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186 &conf->ciphers);
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187 }
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188 }
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189
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190 if (ngx_ssl_generate_rsa512_key(&conf->ssl) != NGX_OK) {
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191 return NGX_CONF_ERROR;
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192 }
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193
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194 SSL_CTX_set_session_cache_mode(conf->ssl.ctx, SSL_SESS_CACHE_SERVER);
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195
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196 SSL_CTX_set_session_id_context(conf->ssl.ctx, ngx_imap_session_id_ctx,
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197 sizeof(ngx_imap_session_id_ctx) - 1);
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541
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198
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199 return NGX_CONF_OK;
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200 }
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