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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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390
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12 #define NGX_DEFAULT_CIPHERS "ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP"
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290
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13
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14
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15 static void *ngx_mail_ssl_create_conf(ngx_conf_t *cf);
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16 static char *ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child);
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426
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17
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18 static char *ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd,
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19 void *conf);
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20 static char *ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd,
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21 void *conf);
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290
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22 static char *ngx_mail_ssl_session_cache(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 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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26
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27 static char *ngx_mail_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd,
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28 void *conf);
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29
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30 static char ngx_mail_ssl_openssl097[] = "OpenSSL 0.9.7 and higher";
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31
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32 #endif
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33
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34
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35 static ngx_conf_enum_t ngx_http_starttls_state[] = {
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36 { ngx_string("off"), NGX_MAIL_STARTTLS_OFF },
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37 { ngx_string("on"), NGX_MAIL_STARTTLS_ON },
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38 { ngx_string("only"), NGX_MAIL_STARTTLS_ONLY },
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39 { ngx_null_string, 0 }
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40 };
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41
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42
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43
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44 static ngx_conf_bitmask_t ngx_mail_ssl_protocols[] = {
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45 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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46 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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47 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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48 { ngx_null_string, 0 }
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49 };
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50
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51
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52 static ngx_command_t ngx_mail_ssl_commands[] = {
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53
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54 { ngx_string("ssl"),
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55 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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426
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56 ngx_mail_ssl_enable,
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290
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57 NGX_MAIL_SRV_CONF_OFFSET,
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58 offsetof(ngx_mail_ssl_conf_t, enable),
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59 NULL },
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60
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61 { ngx_string("starttls"),
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62 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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426
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63 ngx_mail_ssl_starttls,
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290
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64 NGX_MAIL_SRV_CONF_OFFSET,
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65 offsetof(ngx_mail_ssl_conf_t, starttls),
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66 ngx_http_starttls_state },
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67
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68 { ngx_string("ssl_certificate"),
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69 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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70 ngx_conf_set_str_slot,
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71 NGX_MAIL_SRV_CONF_OFFSET,
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72 offsetof(ngx_mail_ssl_conf_t, certificate),
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73 NULL },
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74
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75 { ngx_string("ssl_certificate_key"),
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76 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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77 ngx_conf_set_str_slot,
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78 NGX_MAIL_SRV_CONF_OFFSET,
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79 offsetof(ngx_mail_ssl_conf_t, certificate_key),
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80 NULL },
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81
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380
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82 { ngx_string("ssl_dhparam"),
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83 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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84 ngx_conf_set_str_slot,
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85 NGX_MAIL_SRV_CONF_OFFSET,
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86 offsetof(ngx_mail_ssl_conf_t, dhparam),
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87 NULL },
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88
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290
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89 { ngx_string("ssl_protocols"),
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90 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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91 ngx_conf_set_bitmask_slot,
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92 NGX_MAIL_SRV_CONF_OFFSET,
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93 offsetof(ngx_mail_ssl_conf_t, protocols),
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94 &ngx_mail_ssl_protocols },
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95
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96 { ngx_string("ssl_ciphers"),
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97 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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98 ngx_conf_set_str_slot,
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99 NGX_MAIL_SRV_CONF_OFFSET,
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100 offsetof(ngx_mail_ssl_conf_t, ciphers),
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101 NULL },
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102
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103 { ngx_string("ssl_prefer_server_ciphers"),
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104 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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105 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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106 ngx_conf_set_flag_slot,
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107 NGX_MAIL_SRV_CONF_OFFSET,
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108 offsetof(ngx_mail_ssl_conf_t, prefer_server_ciphers),
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109 NULL },
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110 #else
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111 ngx_mail_ssl_nosupported, 0, 0, ngx_mail_ssl_openssl097 },
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112 #endif
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113
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114 { ngx_string("ssl_session_cache"),
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115 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE12,
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116 ngx_mail_ssl_session_cache,
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117 NGX_MAIL_SRV_CONF_OFFSET,
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118 0,
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119 NULL },
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120
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121 { ngx_string("ssl_session_timeout"),
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122 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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123 ngx_conf_set_sec_slot,
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124 NGX_MAIL_SRV_CONF_OFFSET,
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125 offsetof(ngx_mail_ssl_conf_t, session_timeout),
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126 NULL },
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127
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128 ngx_null_command
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129 };
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130
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131
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132 static ngx_mail_module_t ngx_mail_ssl_module_ctx = {
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336
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133 NULL, /* protocol */
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134
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290
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135 NULL, /* create main configuration */
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136 NULL, /* init main configuration */
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137
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138 ngx_mail_ssl_create_conf, /* create server configuration */
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139 ngx_mail_ssl_merge_conf /* merge server configuration */
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140 };
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141
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142
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143 ngx_module_t ngx_mail_ssl_module = {
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144 NGX_MODULE_V1,
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145 &ngx_mail_ssl_module_ctx, /* module context */
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146 ngx_mail_ssl_commands, /* module directives */
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147 NGX_MAIL_MODULE, /* module type */
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148 NULL, /* init master */
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149 NULL, /* init module */
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150 NULL, /* init process */
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151 NULL, /* init thread */
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152 NULL, /* exit thread */
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153 NULL, /* exit process */
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154 NULL, /* exit master */
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155 NGX_MODULE_V1_PADDING
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156 };
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157
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158
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159 static ngx_str_t ngx_mail_ssl_sess_id_ctx = ngx_string("MAIL");
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160
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161
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162 static void *
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163 ngx_mail_ssl_create_conf(ngx_conf_t *cf)
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164 {
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165 ngx_mail_ssl_conf_t *scf;
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166
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167 scf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_ssl_conf_t));
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168 if (scf == NULL) {
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169 return NGX_CONF_ERROR;
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170 }
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171
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172 /*
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173 * set by ngx_pcalloc():
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174 *
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175 * scf->protocols = 0;
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380
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176 * scf->certificate = { 0, NULL };
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177 * scf->certificate_key = { 0, NULL };
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178 * scf->dhparam = { 0, NULL };
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290
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179 * scf->ciphers.len = 0;
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180 * scf->ciphers.data = NULL;
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181 * scf->shm_zone = NULL;
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182 */
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183
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184 scf->enable = NGX_CONF_UNSET;
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185 scf->starttls = NGX_CONF_UNSET;
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186 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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187 scf->builtin_session_cache = NGX_CONF_UNSET;
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188 scf->session_timeout = NGX_CONF_UNSET;
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189
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190 return scf;
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191 }
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192
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193
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194 static char *
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195 ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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196 {
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197 ngx_mail_ssl_conf_t *prev = parent;
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198 ngx_mail_ssl_conf_t *conf = child;
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199
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426
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200 char *mode;
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290
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201 ngx_pool_cleanup_t *cln;
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202
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203 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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426
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204 ngx_conf_merge_uint_value(conf->starttls, prev->starttls,
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205 NGX_MAIL_STARTTLS_OFF);
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290
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206
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207 ngx_conf_merge_value(conf->session_timeout,
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208 prev->session_timeout, 300);
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209
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210 ngx_conf_merge_value(conf->prefer_server_ciphers,
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211 prev->prefer_server_ciphers, 0);
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212
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213 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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214 (NGX_CONF_BITMASK_SET
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215 |NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
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216
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426
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217 ngx_conf_merge_str_value(conf->certificate, prev->certificate, "");
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218 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key, "");
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290
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219
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380
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220 ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, "");
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221
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390
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222 ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFAULT_CIPHERS);
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290
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223
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224
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225 conf->ssl.log = cf->log;
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226
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426
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227 if (conf->enable) {
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228 mode = "ssl";
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229
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230 } else if (conf->starttls != NGX_MAIL_STARTTLS_OFF) {
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231 mode = "starttls";
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232
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233 } else {
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234 mode = "";
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235 }
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236
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237 if (*mode) {
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238
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239 if (conf->certificate.len == 0) {
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240 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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241 "no \"ssl_certificate\" is defined for "
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242 "the \"%s\" directive in %s:%ui",
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243 mode, conf->file, conf->line);
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244 return NGX_CONF_ERROR;
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245 }
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246
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247 if (conf->certificate_key.len == 0) {
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248 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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249 "no \"ssl_certificate_key\" is defined for "
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250 "the \"%s\" directive in %s:%ui",
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251 mode, conf->file, conf->line);
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252 return NGX_CONF_ERROR;
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253 }
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254
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255 } else {
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256
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257 if (conf->certificate.len == 0) {
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258 return NGX_CONF_OK;
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259 }
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260
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261 if (conf->certificate_key.len == 0) {
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262 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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263 "no \"ssl_certificate_key\" is defined "
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264 "for certificate \"%V\"",
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265 &conf->certificate);
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266 return NGX_CONF_ERROR;
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267 }
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268 }
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269
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290
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270 if (ngx_ssl_create(&conf->ssl, conf->protocols, NULL) != NGX_OK) {
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271 return NGX_CONF_ERROR;
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272 }
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273
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274 cln = ngx_pool_cleanup_add(cf->pool, 0);
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275 if (cln == NULL) {
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276 return NGX_CONF_ERROR;
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277 }
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278
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279 cln->handler = ngx_ssl_cleanup_ctx;
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280 cln->data = &conf->ssl;
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281
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282 if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
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283 &conf->certificate_key)
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284 != NGX_OK)
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285 {
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286 return NGX_CONF_ERROR;
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287 }
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288
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289 if (conf->ciphers.len) {
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290 if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
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291 (const char *) conf->ciphers.data)
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292 == 0)
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293 {
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294 ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
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295 "SSL_CTX_set_cipher_list(\"%V\") failed",
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296 &conf->ciphers);
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297 }
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298 }
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299
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300 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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301
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302 if (conf->prefer_server_ciphers) {
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303 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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304 }
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305
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306 #endif
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307
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308 if (ngx_ssl_generate_rsa512_key(&conf->ssl) != NGX_OK) {
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309 return NGX_CONF_ERROR;
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310 }
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311
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380
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312 if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
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313 return NGX_CONF_ERROR;
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314 }
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315
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290
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316 ngx_conf_merge_value(conf->builtin_session_cache,
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378
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317 prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
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290
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318
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319 if (conf->shm_zone == NULL) {
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320 conf->shm_zone = prev->shm_zone;
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321 }
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322
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323 if (ngx_ssl_session_cache(&conf->ssl, &ngx_mail_ssl_sess_id_ctx,
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324 conf->builtin_session_cache,
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325 conf->shm_zone, conf->session_timeout)
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326 != NGX_OK)
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327 {
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328 return NGX_CONF_ERROR;
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329 }
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330
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331 return NGX_CONF_OK;
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332 }
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333
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334
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335 static char *
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426
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336 ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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337 {
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338 ngx_mail_ssl_conf_t *scf = conf;
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339
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340 char *rv;
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341
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342 rv = ngx_conf_set_flag_slot(cf, cmd, conf);
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343
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344 if (rv != NGX_CONF_OK) {
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345 return rv;
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346 }
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347
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348 if (scf->enable && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
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349 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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350 "\"starttls\" directive conflicts with \"ssl on\"");
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351 return NGX_CONF_ERROR;
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352 }
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353
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354 scf->file = cf->conf_file->file.name.data;
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355 scf->line = cf->conf_file->line;
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356
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357 return NGX_CONF_OK;
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358 }
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359
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360
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361 static char *
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362 ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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363 {
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364 ngx_mail_ssl_conf_t *scf = conf;
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365
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366 char *rv;
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367
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368 rv = ngx_conf_set_enum_slot(cf, cmd, conf);
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369
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370 if (rv != NGX_CONF_OK) {
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371 return rv;
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372 }
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373
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374 if (scf->enable == 1 && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
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375 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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376 "\"ssl\" directive conflicts with \"starttls\"");
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377 return NGX_CONF_ERROR;
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378 }
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379
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380 scf->file = cf->conf_file->file.name.data;
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381 scf->line = cf->conf_file->line;
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382
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383 return NGX_CONF_OK;
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384 }
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385
|
|
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386
|
|
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387 static char *
|
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290
|
388 ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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|
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389 {
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|
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390 ngx_mail_ssl_conf_t *scf = conf;
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391
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392 size_t len;
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393 ngx_str_t *value, name, size;
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394 ngx_int_t n;
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|
395 ngx_uint_t i, j;
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396
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397 value = cf->args->elts;
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398
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399 for (i = 1; i < cf->args->nelts; i++) {
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400
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358
|
401 if (ngx_strcmp(value[i].data, "off") == 0) {
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402 scf->builtin_session_cache = NGX_SSL_NO_SCACHE;
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|
403 continue;
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404 }
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405
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378
|
406 if (ngx_strcmp(value[i].data, "none") == 0) {
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407 scf->builtin_session_cache = NGX_SSL_NONE_SCACHE;
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|
408 continue;
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|
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409 }
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410
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|
290
|
411 if (ngx_strcmp(value[i].data, "builtin") == 0) {
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|
412 scf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE;
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|
413 continue;
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414 }
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415
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416 if (value[i].len > sizeof("builtin:") - 1
|
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|
417 && ngx_strncmp(value[i].data, "builtin:", sizeof("builtin:") - 1)
|
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|
418 == 0)
|
|
|
419 {
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|
420 n = ngx_atoi(value[i].data + sizeof("builtin:") - 1,
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|
421 value[i].len - (sizeof("builtin:") - 1));
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422
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|
|
423 if (n == NGX_ERROR) {
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|
|
424 goto invalid;
|
|
|
425 }
|
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|
426
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|
|
427 scf->builtin_session_cache = n;
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|
428
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|
|
429 continue;
|
|
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430 }
|
|
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431
|
|
|
432 if (value[i].len > sizeof("shared:") - 1
|
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|
433 && ngx_strncmp(value[i].data, "shared:", sizeof("shared:") - 1)
|
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|
434 == 0)
|
|
|
435 {
|
|
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436 len = 0;
|
|
|
437
|
|
|
438 for (j = sizeof("shared:") - 1; j < value[i].len; j++) {
|
|
|
439 if (value[i].data[j] == ':') {
|
|
|
440 break;
|
|
|
441 }
|
|
|
442
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|
|
443 len++;
|
|
|
444 }
|
|
|
445
|
|
|
446 if (len == 0) {
|
|
|
447 goto invalid;
|
|
|
448 }
|
|
|
449
|
|
|
450 name.len = len;
|
|
|
451 name.data = value[i].data + sizeof("shared:") - 1;
|
|
|
452
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|
|
453 size.len = value[i].len - j - 1;
|
|
|
454 size.data = name.data + len + 1;
|
|
|
455
|
|
|
456 n = ngx_parse_size(&size);
|
|
|
457
|
|
|
458 if (n == NGX_ERROR) {
|
|
|
459 goto invalid;
|
|
|
460 }
|
|
|
461
|
|
|
462 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
|
|
|
463 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
464 "session cache \"%V\" is too small",
|
|
|
465 &value[i]);
|
|
|
466
|
|
|
467 return NGX_CONF_ERROR;
|
|
|
468 }
|
|
|
469
|
|
|
470 scf->shm_zone = ngx_shared_memory_add(cf, &name, n,
|
|
|
471 &ngx_mail_ssl_module);
|
|
|
472 if (scf->shm_zone == NULL) {
|
|
|
473 return NGX_CONF_ERROR;
|
|
|
474 }
|
|
|
475
|
|
|
476 continue;
|
|
|
477 }
|
|
|
478
|
|
|
479 goto invalid;
|
|
|
480 }
|
|
|
481
|
|
|
482 if (scf->shm_zone && scf->builtin_session_cache == NGX_CONF_UNSET) {
|
|
|
483 scf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE;
|
|
|
484 }
|
|
|
485
|
|
|
486 return NGX_CONF_OK;
|
|
|
487
|
|
|
488 invalid:
|
|
|
489
|
|
|
490 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
491 "invalid session cache \"%V\"", &value[i]);
|
|
|
492
|
|
|
493 return NGX_CONF_ERROR;
|
|
|
494 }
|
|
|
495
|
|
|
496
|
|
|
497 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
|
|
|
498
|
|
|
499 static char *
|
|
|
500 ngx_mail_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
501 {
|
|
|
502 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
503 "\"%V\" directive is available only in %s,",
|
|
|
504 &cmd->name, cmd->post);
|
|
|
505
|
|
|
506 return NGX_CONF_ERROR;
|
|
|
507 }
|
|
|
508
|
|
|
509 #endif
|
