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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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563
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20 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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21
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22 static char *ngx_imap_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd,
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23 void *conf);
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24
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25 static char ngx_imap_ssl_openssl097[] = "OpenSSL 0.9.7 and higher";
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26
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27 #endif
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28
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539
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29
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547
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30 static ngx_conf_bitmask_t ngx_imap_ssl_protocols[] = {
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31 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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32 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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33 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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34 { ngx_null_string, 0 }
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35 };
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36
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37
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539
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38 static ngx_command_t ngx_imap_ssl_commands[] = {
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39
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40 { ngx_string("ssl"),
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41 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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42 ngx_conf_set_flag_slot,
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43 NGX_IMAP_SRV_CONF_OFFSET,
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44 offsetof(ngx_imap_ssl_conf_t, enable),
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45 NULL },
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46
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47 { ngx_string("ssl_certificate"),
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48 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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49 ngx_conf_set_str_slot,
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50 NGX_IMAP_SRV_CONF_OFFSET,
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51 offsetof(ngx_imap_ssl_conf_t, certificate),
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52 NULL },
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53
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54 { ngx_string("ssl_certificate_key"),
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55 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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56 ngx_conf_set_str_slot,
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57 NGX_IMAP_SRV_CONF_OFFSET,
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58 offsetof(ngx_imap_ssl_conf_t, certificate_key),
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59 NULL },
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60
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547
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61 { ngx_string("ssl_protocols"),
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563
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62 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_1MORE,
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547
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63 ngx_conf_set_bitmask_slot,
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64 NGX_IMAP_SRV_CONF_OFFSET,
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65 offsetof(ngx_imap_ssl_conf_t, protocols),
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66 &ngx_imap_ssl_protocols },
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67
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539
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68 { ngx_string("ssl_ciphers"),
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69 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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70 ngx_conf_set_str_slot,
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71 NGX_IMAP_SRV_CONF_OFFSET,
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72 offsetof(ngx_imap_ssl_conf_t, ciphers),
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73 NULL },
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74
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547
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75 { ngx_string("ssl_prefer_server_ciphers"),
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76 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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563
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77 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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547
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78 ngx_conf_set_flag_slot,
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79 NGX_IMAP_SRV_CONF_OFFSET,
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80 offsetof(ngx_imap_ssl_conf_t, prefer_server_ciphers),
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81 NULL },
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563
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82 #else
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83 ngx_imap_ssl_nosupported, 0, 0, ngx_imap_ssl_openssl097 },
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84 #endif
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85
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547
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86
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539
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87 ngx_null_command
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88 };
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89
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90
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91 static ngx_imap_module_t ngx_imap_ssl_module_ctx = {
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92 NULL, /* create main configuration */
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93 NULL, /* init main configuration */
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94
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95 ngx_imap_ssl_create_conf, /* create server configuration */
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96 ngx_imap_ssl_merge_conf /* merge server configuration */
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97 };
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98
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99
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100 ngx_module_t ngx_imap_ssl_module = {
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101 NGX_MODULE_V1,
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102 &ngx_imap_ssl_module_ctx, /* module context */
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103 ngx_imap_ssl_commands, /* module directives */
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104 NGX_IMAP_MODULE, /* module type */
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541
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105 NULL, /* init master */
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539
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106 NULL, /* init module */
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541
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107 NULL, /* init process */
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108 NULL, /* init thread */
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109 NULL, /* exit thread */
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110 NULL, /* exit process */
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111 NULL, /* exit master */
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112 NGX_MODULE_V1_PADDING
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539
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113 };
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114
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115
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543
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116 static u_char ngx_imap_session_id_ctx[] = "IMAP";
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117
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118
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539
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119 static void *
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120 ngx_imap_ssl_create_conf(ngx_conf_t *cf)
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121 {
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122 ngx_imap_ssl_conf_t *scf;
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123
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124 scf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_ssl_conf_t));
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125 if (scf == NULL) {
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126 return NGX_CONF_ERROR;
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127 }
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128
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129 /*
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130 * set by ngx_pcalloc():
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131 *
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132 * scf->protocols = 0;
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133 *
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134 * scf->certificate.len = 0;
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135 * scf->certificate.data = NULL;
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136 * scf->certificate_key.len = 0;
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137 * scf->certificate_key.data = NULL;
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138 * scf->ciphers.len = 0;
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139 * scf->ciphers.data = NULL;
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140 */
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141
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142 scf->enable = NGX_CONF_UNSET;
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143 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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539
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144
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145 return scf;
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146 }
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147
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148
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149 static char *
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150 ngx_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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151 {
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152 ngx_imap_ssl_conf_t *prev = parent;
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153 ngx_imap_ssl_conf_t *conf = child;
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154
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155 ngx_pool_cleanup_t *cln;
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156
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539
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157 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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158
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159 if (conf->enable == 0) {
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160 return NGX_CONF_OK;
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161 }
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162
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547
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163 ngx_conf_merge_value(conf->prefer_server_ciphers,
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164 prev->prefer_server_ciphers, 0);
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165
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166 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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167 (NGX_CONF_BITMASK_SET
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168 |NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
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169
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539
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170 ngx_conf_merge_str_value(conf->certificate, prev->certificate,
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171 NGX_DEFLAUT_CERTIFICATE);
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172
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173 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
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174 NGX_DEFLAUT_CERTIFICATE_KEY);
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175
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176 ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFLAUT_CIPHERS);
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177
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178
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179 conf->ssl.log = cf->log;
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180
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181 if (ngx_ssl_create(&conf->ssl, conf->protocols) != NGX_OK) {
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182 return NGX_CONF_ERROR;
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183 }
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184
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185 cln = ngx_pool_cleanup_add(cf->pool, 0);
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186 if (cln == NULL) {
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187 return NGX_CONF_ERROR;
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188 }
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189
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190 cln->handler = ngx_ssl_cleanup_ctx;
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191 cln->data = &conf->ssl;
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192
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193 if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
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194 &conf->certificate_key)
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195 != NGX_OK)
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196 {
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197 return NGX_CONF_ERROR;
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198 }
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539
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199
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200 if (conf->ciphers.len) {
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547
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201 if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
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202 (const char *) conf->ciphers.data)
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203 == 0)
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539
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204 {
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205 ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
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206 "SSL_CTX_set_cipher_list(\"%V\") failed",
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207 &conf->ciphers);
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208 }
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209 }
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210
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563
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211 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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212
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213 if (conf->prefer_server_ciphers) {
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214 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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215 }
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216
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217 #endif
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218
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219 if (ngx_ssl_generate_rsa512_key(&conf->ssl) != NGX_OK) {
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220 return NGX_CONF_ERROR;
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221 }
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222
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223 SSL_CTX_set_session_cache_mode(conf->ssl.ctx, SSL_SESS_CACHE_SERVER);
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224
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225 SSL_CTX_set_session_id_context(conf->ssl.ctx, ngx_imap_session_id_ctx,
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226 sizeof(ngx_imap_session_id_ctx) - 1);
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227
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228 return NGX_CONF_OK;
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229 }
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563
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230
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231
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232 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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233
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234 static char *
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235 ngx_imap_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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236 {
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237 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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238 "\"%V\" directive is available only in %s,",
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239 &cmd->name, cmd->post);
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240
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241 return NGX_CONF_ERROR;
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242 }
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243
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244 #endif
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