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290
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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_mail.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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14 #define NGX_DEFLAUT_CIPHERS "ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP"
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15
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16
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17 static void *ngx_mail_ssl_create_conf(ngx_conf_t *cf);
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18 static char *ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child);
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19 static char *ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd,
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20 void *conf);
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21
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22 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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23
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24 static char *ngx_mail_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd,
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25 void *conf);
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26
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27 static char ngx_mail_ssl_openssl097[] = "OpenSSL 0.9.7 and higher";
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28
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29 #endif
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30
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31
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32 static ngx_conf_enum_t ngx_http_starttls_state[] = {
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33 { ngx_string("off"), NGX_MAIL_STARTTLS_OFF },
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34 { ngx_string("on"), NGX_MAIL_STARTTLS_ON },
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35 { ngx_string("only"), NGX_MAIL_STARTTLS_ONLY },
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36 { ngx_null_string, 0 }
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37 };
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38
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39
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40
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41 static ngx_conf_bitmask_t ngx_mail_ssl_protocols[] = {
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42 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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43 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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44 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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45 { ngx_null_string, 0 }
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46 };
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47
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48
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49 static ngx_command_t ngx_mail_ssl_commands[] = {
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50
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51 { ngx_string("ssl"),
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52 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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53 ngx_conf_set_flag_slot,
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54 NGX_MAIL_SRV_CONF_OFFSET,
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55 offsetof(ngx_mail_ssl_conf_t, enable),
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56 NULL },
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57
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58 { ngx_string("starttls"),
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59 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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60 ngx_conf_set_enum_slot,
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61 NGX_MAIL_SRV_CONF_OFFSET,
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62 offsetof(ngx_mail_ssl_conf_t, starttls),
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63 ngx_http_starttls_state },
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64
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65 { ngx_string("ssl_certificate"),
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66 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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67 ngx_conf_set_str_slot,
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68 NGX_MAIL_SRV_CONF_OFFSET,
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69 offsetof(ngx_mail_ssl_conf_t, certificate),
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70 NULL },
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71
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72 { ngx_string("ssl_certificate_key"),
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73 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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74 ngx_conf_set_str_slot,
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75 NGX_MAIL_SRV_CONF_OFFSET,
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76 offsetof(ngx_mail_ssl_conf_t, certificate_key),
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77 NULL },
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78
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79 { ngx_string("ssl_protocols"),
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80 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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81 ngx_conf_set_bitmask_slot,
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82 NGX_MAIL_SRV_CONF_OFFSET,
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83 offsetof(ngx_mail_ssl_conf_t, protocols),
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84 &ngx_mail_ssl_protocols },
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85
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86 { ngx_string("ssl_ciphers"),
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87 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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88 ngx_conf_set_str_slot,
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89 NGX_MAIL_SRV_CONF_OFFSET,
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90 offsetof(ngx_mail_ssl_conf_t, ciphers),
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91 NULL },
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92
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93 { ngx_string("ssl_prefer_server_ciphers"),
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94 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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95 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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96 ngx_conf_set_flag_slot,
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97 NGX_MAIL_SRV_CONF_OFFSET,
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98 offsetof(ngx_mail_ssl_conf_t, prefer_server_ciphers),
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99 NULL },
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100 #else
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101 ngx_mail_ssl_nosupported, 0, 0, ngx_mail_ssl_openssl097 },
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102 #endif
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103
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104 { ngx_string("ssl_session_cache"),
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105 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE12,
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106 ngx_mail_ssl_session_cache,
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107 NGX_MAIL_SRV_CONF_OFFSET,
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108 0,
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109 NULL },
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110
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111 { ngx_string("ssl_session_timeout"),
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112 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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113 ngx_conf_set_sec_slot,
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114 NGX_MAIL_SRV_CONF_OFFSET,
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115 offsetof(ngx_mail_ssl_conf_t, session_timeout),
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116 NULL },
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117
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118 ngx_null_command
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119 };
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120
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121
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122 static ngx_mail_module_t ngx_mail_ssl_module_ctx = {
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336
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123 NULL, /* protocol */
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124
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290
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125 NULL, /* create main configuration */
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126 NULL, /* init main configuration */
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127
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128 ngx_mail_ssl_create_conf, /* create server configuration */
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129 ngx_mail_ssl_merge_conf /* merge server configuration */
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130 };
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131
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132
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133 ngx_module_t ngx_mail_ssl_module = {
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134 NGX_MODULE_V1,
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135 &ngx_mail_ssl_module_ctx, /* module context */
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136 ngx_mail_ssl_commands, /* module directives */
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137 NGX_MAIL_MODULE, /* module type */
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138 NULL, /* init master */
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139 NULL, /* init module */
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140 NULL, /* init process */
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141 NULL, /* init thread */
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142 NULL, /* exit thread */
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143 NULL, /* exit process */
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144 NULL, /* exit master */
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145 NGX_MODULE_V1_PADDING
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146 };
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147
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148
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149 static ngx_str_t ngx_mail_ssl_sess_id_ctx = ngx_string("MAIL");
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150
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151
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152 static void *
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153 ngx_mail_ssl_create_conf(ngx_conf_t *cf)
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154 {
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155 ngx_mail_ssl_conf_t *scf;
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156
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157 scf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_ssl_conf_t));
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158 if (scf == NULL) {
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159 return NGX_CONF_ERROR;
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160 }
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161
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162 /*
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163 * set by ngx_pcalloc():
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164 *
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165 * scf->protocols = 0;
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166 * scf->certificate.len = 0;
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167 * scf->certificate.data = NULL;
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168 * scf->certificate_key.len = 0;
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169 * scf->certificate_key.data = NULL;
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170 * scf->ciphers.len = 0;
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171 * scf->ciphers.data = NULL;
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172 * scf->shm_zone = NULL;
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173 */
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174
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175 scf->enable = NGX_CONF_UNSET;
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176 scf->starttls = NGX_CONF_UNSET;
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177 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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178 scf->builtin_session_cache = NGX_CONF_UNSET;
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179 scf->session_timeout = NGX_CONF_UNSET;
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180
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181 return scf;
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182 }
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183
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184
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185 static char *
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186 ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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187 {
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188 ngx_mail_ssl_conf_t *prev = parent;
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189 ngx_mail_ssl_conf_t *conf = child;
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190
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191 ngx_pool_cleanup_t *cln;
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192
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193 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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194 ngx_conf_merge_value(conf->starttls, prev->starttls, NGX_MAIL_STARTTLS_OFF);
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195
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196 if (conf->enable == 0 && conf->starttls == NGX_MAIL_STARTTLS_OFF) {
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197 return NGX_CONF_OK;
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198 }
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199
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200 ngx_conf_merge_value(conf->session_timeout,
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201 prev->session_timeout, 300);
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202
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203 ngx_conf_merge_value(conf->prefer_server_ciphers,
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204 prev->prefer_server_ciphers, 0);
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205
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206 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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207 (NGX_CONF_BITMASK_SET
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208 |NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
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209
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210 ngx_conf_merge_str_value(conf->certificate, prev->certificate,
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358
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211 NGX_DEFLAUT_CERTIFICATE);
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290
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212
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213 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
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358
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214 NGX_DEFLAUT_CERTIFICATE_KEY);
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290
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215
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216 ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFLAUT_CIPHERS);
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217
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218
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219 conf->ssl.log = cf->log;
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220
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221 if (ngx_ssl_create(&conf->ssl, conf->protocols, NULL) != NGX_OK) {
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222 return NGX_CONF_ERROR;
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223 }
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224
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225 cln = ngx_pool_cleanup_add(cf->pool, 0);
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226 if (cln == NULL) {
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227 return NGX_CONF_ERROR;
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228 }
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229
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230 cln->handler = ngx_ssl_cleanup_ctx;
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231 cln->data = &conf->ssl;
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232
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233 if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
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234 &conf->certificate_key)
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235 != NGX_OK)
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236 {
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237 return NGX_CONF_ERROR;
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238 }
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239
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240 if (conf->ciphers.len) {
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241 if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
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242 (const char *) conf->ciphers.data)
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243 == 0)
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244 {
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245 ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
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246 "SSL_CTX_set_cipher_list(\"%V\") failed",
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247 &conf->ciphers);
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248 }
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249 }
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250
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251 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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252
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253 if (conf->prefer_server_ciphers) {
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254 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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255 }
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256
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257 #endif
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258
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259 if (ngx_ssl_generate_rsa512_key(&conf->ssl) != NGX_OK) {
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260 return NGX_CONF_ERROR;
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261 }
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262
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263 ngx_conf_merge_value(conf->builtin_session_cache,
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376
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264 prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
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290
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265
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266 if (conf->shm_zone == NULL) {
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267 conf->shm_zone = prev->shm_zone;
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268 }
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269
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270 if (ngx_ssl_session_cache(&conf->ssl, &ngx_mail_ssl_sess_id_ctx,
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271 conf->builtin_session_cache,
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272 conf->shm_zone, conf->session_timeout)
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273 != NGX_OK)
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274 {
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275 return NGX_CONF_ERROR;
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276 }
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277
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278 return NGX_CONF_OK;
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279 }
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280
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281
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282 static char *
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283 ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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284 {
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285 ngx_mail_ssl_conf_t *scf = conf;
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286
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287 size_t len;
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288 ngx_str_t *value, name, size;
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289 ngx_int_t n;
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290 ngx_uint_t i, j;
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291
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292 value = cf->args->elts;
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293
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294 for (i = 1; i < cf->args->nelts; i++) {
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295
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358
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296 if (ngx_strcmp(value[i].data, "off") == 0) {
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297 scf->builtin_session_cache = NGX_SSL_NO_SCACHE;
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298 continue;
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299 }
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300
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376
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301 if (ngx_strcmp(value[i].data, "none") == 0) {
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302 scf->builtin_session_cache = NGX_SSL_NONE_SCACHE;
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303 continue;
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304 }
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305
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290
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306 if (ngx_strcmp(value[i].data, "builtin") == 0) {
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307 scf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE;
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308 continue;
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309 }
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310
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311 if (value[i].len > sizeof("builtin:") - 1
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312 && ngx_strncmp(value[i].data, "builtin:", sizeof("builtin:") - 1)
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313 == 0)
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314 {
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315 n = ngx_atoi(value[i].data + sizeof("builtin:") - 1,
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316 value[i].len - (sizeof("builtin:") - 1));
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317
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318 if (n == NGX_ERROR) {
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319 goto invalid;
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320 }
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321
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322 scf->builtin_session_cache = n;
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323
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324 continue;
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325 }
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326
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327 if (value[i].len > sizeof("shared:") - 1
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328 && ngx_strncmp(value[i].data, "shared:", sizeof("shared:") - 1)
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329 == 0)
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330 {
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331 len = 0;
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332
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333 for (j = sizeof("shared:") - 1; j < value[i].len; j++) {
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334 if (value[i].data[j] == ':') {
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335 break;
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336 }
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337
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338 len++;
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339 }
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340
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341 if (len == 0) {
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342 goto invalid;
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343 }
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344
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345 name.len = len;
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346 name.data = value[i].data + sizeof("shared:") - 1;
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347
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348 size.len = value[i].len - j - 1;
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349 size.data = name.data + len + 1;
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350
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351 n = ngx_parse_size(&size);
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352
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353 if (n == NGX_ERROR) {
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354 goto invalid;
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355 }
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356
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357 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
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358 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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359 "session cache \"%V\" is too small",
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360 &value[i]);
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361
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362 return NGX_CONF_ERROR;
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363 }
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364
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365 scf->shm_zone = ngx_shared_memory_add(cf, &name, n,
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366 &ngx_mail_ssl_module);
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367 if (scf->shm_zone == NULL) {
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368 return NGX_CONF_ERROR;
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369 }
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370
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371 continue;
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372 }
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373
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374 goto invalid;
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375 }
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376
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377 if (scf->shm_zone && scf->builtin_session_cache == NGX_CONF_UNSET) {
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378 scf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE;
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379 }
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380
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381 return NGX_CONF_OK;
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382
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383 invalid:
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384
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385 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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386 "invalid session cache \"%V\"", &value[i]);
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387
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388 return NGX_CONF_ERROR;
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389 }
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390
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391
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392 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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393
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394 static char *
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395 ngx_mail_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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396 {
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397 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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398 "\"%V\" directive is available only in %s,",
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399 &cmd->name, cmd->post);
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400
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401 return NGX_CONF_ERROR;
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402 }
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403
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404 #endif
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