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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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660
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4 * Copyright (C) Nginx, Inc.
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290
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_mail.h>
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11
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12
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632
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13 #define NGX_DEFAULT_CIPHERS "HIGH:!aNULL:!MD5"
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14 #define NGX_DEFAULT_ECDH_CURVE "prime256v1"
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290
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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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404
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19
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20 static char *ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd,
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21 void *conf);
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22 static char *ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd,
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23 void *conf);
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290
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24 static char *ngx_mail_ssl_session_cache(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
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28 static ngx_conf_enum_t ngx_http_starttls_state[] = {
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29 { ngx_string("off"), NGX_MAIL_STARTTLS_OFF },
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30 { ngx_string("on"), NGX_MAIL_STARTTLS_ON },
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31 { ngx_string("only"), NGX_MAIL_STARTTLS_ONLY },
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32 { ngx_null_string, 0 }
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33 };
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34
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35
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36
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37 static ngx_conf_bitmask_t ngx_mail_ssl_protocols[] = {
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38 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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39 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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40 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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658
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41 { ngx_string("TLSv1.1"), NGX_SSL_TLSv1_1 },
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42 { ngx_string("TLSv1.2"), NGX_SSL_TLSv1_2 },
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290
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43 { ngx_null_string, 0 }
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44 };
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45
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46
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47 static ngx_command_t ngx_mail_ssl_commands[] = {
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48
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49 { ngx_string("ssl"),
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50 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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404
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51 ngx_mail_ssl_enable,
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290
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52 NGX_MAIL_SRV_CONF_OFFSET,
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53 offsetof(ngx_mail_ssl_conf_t, enable),
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54 NULL },
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55
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56 { ngx_string("starttls"),
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57 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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404
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58 ngx_mail_ssl_starttls,
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290
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59 NGX_MAIL_SRV_CONF_OFFSET,
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60 offsetof(ngx_mail_ssl_conf_t, starttls),
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61 ngx_http_starttls_state },
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62
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63 { ngx_string("ssl_certificate"),
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64 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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65 ngx_conf_set_str_slot,
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66 NGX_MAIL_SRV_CONF_OFFSET,
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67 offsetof(ngx_mail_ssl_conf_t, certificate),
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68 NULL },
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69
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70 { ngx_string("ssl_certificate_key"),
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71 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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72 ngx_conf_set_str_slot,
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73 NGX_MAIL_SRV_CONF_OFFSET,
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74 offsetof(ngx_mail_ssl_conf_t, certificate_key),
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75 NULL },
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76
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380
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77 { ngx_string("ssl_dhparam"),
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78 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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79 ngx_conf_set_str_slot,
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80 NGX_MAIL_SRV_CONF_OFFSET,
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81 offsetof(ngx_mail_ssl_conf_t, dhparam),
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82 NULL },
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83
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632
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84 { ngx_string("ssl_ecdh_curve"),
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85 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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86 ngx_conf_set_str_slot,
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87 NGX_MAIL_SRV_CONF_OFFSET,
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88 offsetof(ngx_mail_ssl_conf_t, ecdh_curve),
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89 NULL },
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90
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290
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91 { ngx_string("ssl_protocols"),
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92 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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93 ngx_conf_set_bitmask_slot,
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94 NGX_MAIL_SRV_CONF_OFFSET,
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95 offsetof(ngx_mail_ssl_conf_t, protocols),
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96 &ngx_mail_ssl_protocols },
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97
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98 { ngx_string("ssl_ciphers"),
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99 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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100 ngx_conf_set_str_slot,
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101 NGX_MAIL_SRV_CONF_OFFSET,
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102 offsetof(ngx_mail_ssl_conf_t, ciphers),
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103 NULL },
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104
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105 { ngx_string("ssl_prefer_server_ciphers"),
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106 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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107 ngx_conf_set_flag_slot,
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108 NGX_MAIL_SRV_CONF_OFFSET,
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109 offsetof(ngx_mail_ssl_conf_t, prefer_server_ciphers),
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110 NULL },
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111
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112 { ngx_string("ssl_session_cache"),
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113 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE12,
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114 ngx_mail_ssl_session_cache,
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115 NGX_MAIL_SRV_CONF_OFFSET,
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116 0,
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117 NULL },
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118
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119 { ngx_string("ssl_session_timeout"),
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120 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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121 ngx_conf_set_sec_slot,
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122 NGX_MAIL_SRV_CONF_OFFSET,
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123 offsetof(ngx_mail_ssl_conf_t, session_timeout),
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124 NULL },
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125
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126 ngx_null_command
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127 };
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128
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129
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130 static ngx_mail_module_t ngx_mail_ssl_module_ctx = {
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336
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131 NULL, /* protocol */
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132
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290
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133 NULL, /* create main configuration */
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134 NULL, /* init main configuration */
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135
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136 ngx_mail_ssl_create_conf, /* create server configuration */
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137 ngx_mail_ssl_merge_conf /* merge server configuration */
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138 };
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139
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140
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141 ngx_module_t ngx_mail_ssl_module = {
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142 NGX_MODULE_V1,
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143 &ngx_mail_ssl_module_ctx, /* module context */
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144 ngx_mail_ssl_commands, /* module directives */
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145 NGX_MAIL_MODULE, /* module type */
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146 NULL, /* init master */
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147 NULL, /* init module */
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148 NULL, /* init process */
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149 NULL, /* init thread */
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150 NULL, /* exit thread */
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151 NULL, /* exit process */
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152 NULL, /* exit master */
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153 NGX_MODULE_V1_PADDING
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154 };
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155
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156
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157 static ngx_str_t ngx_mail_ssl_sess_id_ctx = ngx_string("MAIL");
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158
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159
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160 static void *
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161 ngx_mail_ssl_create_conf(ngx_conf_t *cf)
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162 {
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163 ngx_mail_ssl_conf_t *scf;
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164
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165 scf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_ssl_conf_t));
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166 if (scf == NULL) {
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496
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167 return NULL;
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290
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168 }
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169
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170 /*
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171 * set by ngx_pcalloc():
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172 *
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173 * scf->protocols = 0;
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380
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174 * scf->certificate = { 0, NULL };
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175 * scf->certificate_key = { 0, NULL };
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176 * scf->dhparam = { 0, NULL };
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632
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177 * scf->ecdh_curve = { 0, NULL };
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570
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178 * scf->ciphers = { 0, NULL };
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290
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179 * scf->shm_zone = NULL;
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180 */
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181
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182 scf->enable = NGX_CONF_UNSET;
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482
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183 scf->starttls = NGX_CONF_UNSET_UINT;
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184 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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185 scf->builtin_session_cache = NGX_CONF_UNSET;
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186 scf->session_timeout = NGX_CONF_UNSET;
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187
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188 return scf;
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189 }
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190
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191
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192 static char *
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193 ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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194 {
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195 ngx_mail_ssl_conf_t *prev = parent;
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196 ngx_mail_ssl_conf_t *conf = child;
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197
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198 char *mode;
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290
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199 ngx_pool_cleanup_t *cln;
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200
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201 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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404
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202 ngx_conf_merge_uint_value(conf->starttls, prev->starttls,
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203 NGX_MAIL_STARTTLS_OFF);
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290
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204
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205 ngx_conf_merge_value(conf->session_timeout,
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206 prev->session_timeout, 300);
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207
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208 ngx_conf_merge_value(conf->prefer_server_ciphers,
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209 prev->prefer_server_ciphers, 0);
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210
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211 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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658
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212 (NGX_CONF_BITMASK_SET|NGX_SSL_SSLv3|NGX_SSL_TLSv1
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213 |NGX_SSL_TLSv1_1|NGX_SSL_TLSv1_2));
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290
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214
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215 ngx_conf_merge_str_value(conf->certificate, prev->certificate, "");
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216 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key, "");
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290
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217
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380
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218 ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, "");
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219
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632
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220 ngx_conf_merge_str_value(conf->ecdh_curve, prev->ecdh_curve,
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221 NGX_DEFAULT_ECDH_CURVE);
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222
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390
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223 ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFAULT_CIPHERS);
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290
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224
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225
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226 conf->ssl.log = cf->log;
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227
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228 if (conf->enable) {
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229 mode = "ssl";
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230
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231 } else if (conf->starttls != NGX_MAIL_STARTTLS_OFF) {
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232 mode = "starttls";
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233
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234 } else {
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235 mode = "";
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236 }
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237
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238 if (*mode) {
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239
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240 if (conf->certificate.len == 0) {
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241 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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242 "no \"ssl_certificate\" is defined for "
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243 "the \"%s\" directive in %s:%ui",
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244 mode, conf->file, conf->line);
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245 return NGX_CONF_ERROR;
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246 }
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247
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248 if (conf->certificate_key.len == 0) {
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249 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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250 "no \"ssl_certificate_key\" is defined for "
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251 "the \"%s\" directive in %s:%ui",
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252 mode, conf->file, conf->line);
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253 return NGX_CONF_ERROR;
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254 }
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255
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256 } else {
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257
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258 if (conf->certificate.len == 0) {
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259 return NGX_CONF_OK;
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260 }
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261
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262 if (conf->certificate_key.len == 0) {
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263 ngx_log_error(NGX_LOG_EMERG, cf->log, 0,
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264 "no \"ssl_certificate_key\" is defined "
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265 "for certificate \"%V\"",
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266 &conf->certificate);
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267 return NGX_CONF_ERROR;
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268 }
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269 }
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270
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290
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271 if (ngx_ssl_create(&conf->ssl, conf->protocols, NULL) != NGX_OK) {
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272 return NGX_CONF_ERROR;
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273 }
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274
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275 cln = ngx_pool_cleanup_add(cf->pool, 0);
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276 if (cln == NULL) {
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277 return NGX_CONF_ERROR;
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278 }
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279
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280 cln->handler = ngx_ssl_cleanup_ctx;
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281 cln->data = &conf->ssl;
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282
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283 if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
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284 &conf->certificate_key)
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285 != NGX_OK)
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286 {
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287 return NGX_CONF_ERROR;
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288 }
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289
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290 if (conf->ciphers.len) {
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291 if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
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292 (const char *) conf->ciphers.data)
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293 == 0)
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294 {
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295 ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
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296 "SSL_CTX_set_cipher_list(\"%V\") failed",
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297 &conf->ciphers);
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298 }
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299 }
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300
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301 if (conf->prefer_server_ciphers) {
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302 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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303 }
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304
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632
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305 SSL_CTX_set_tmp_rsa_callback(conf->ssl.ctx, ngx_ssl_rsa512_key_callback);
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290
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306
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380
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307 if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
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308 return NGX_CONF_ERROR;
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309 }
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310
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290
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311 ngx_conf_merge_value(conf->builtin_session_cache,
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378
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312 prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
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290
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313
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314 if (conf->shm_zone == NULL) {
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315 conf->shm_zone = prev->shm_zone;
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316 }
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317
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318 if (ngx_ssl_session_cache(&conf->ssl, &ngx_mail_ssl_sess_id_ctx,
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319 conf->builtin_session_cache,
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320 conf->shm_zone, conf->session_timeout)
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321 != NGX_OK)
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322 {
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323 return NGX_CONF_ERROR;
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324 }
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325
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326 return NGX_CONF_OK;
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327 }
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328
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329
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330 static char *
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404
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331 ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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332 {
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333 ngx_mail_ssl_conf_t *scf = conf;
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334
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335 char *rv;
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336
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337 rv = ngx_conf_set_flag_slot(cf, cmd, conf);
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338
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339 if (rv != NGX_CONF_OK) {
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340 return rv;
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341 }
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342
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343 if (scf->enable && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
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344 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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345 "\"starttls\" directive conflicts with \"ssl on\"");
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346 return NGX_CONF_ERROR;
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347 }
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348
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349 scf->file = cf->conf_file->file.name.data;
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350 scf->line = cf->conf_file->line;
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351
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352 return NGX_CONF_OK;
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353 }
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354
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355
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356 static char *
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357 ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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358 {
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359 ngx_mail_ssl_conf_t *scf = conf;
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360
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361 char *rv;
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362
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363 rv = ngx_conf_set_enum_slot(cf, cmd, conf);
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364
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365 if (rv != NGX_CONF_OK) {
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366 return rv;
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367 }
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368
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369 if (scf->enable == 1 && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
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370 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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371 "\"ssl\" directive conflicts with \"starttls\"");
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372 return NGX_CONF_ERROR;
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373 }
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374
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375 scf->file = cf->conf_file->file.name.data;
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376 scf->line = cf->conf_file->line;
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377
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|
|
378 return NGX_CONF_OK;
|
|
|
379 }
|
|
|
380
|
|
|
381
|
|
|
382 static char *
|
|
290
|
383 ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
384 {
|
|
|
385 ngx_mail_ssl_conf_t *scf = conf;
|
|
|
386
|
|
|
387 size_t len;
|
|
|
388 ngx_str_t *value, name, size;
|
|
|
389 ngx_int_t n;
|
|
|
390 ngx_uint_t i, j;
|
|
|
391
|
|
|
392 value = cf->args->elts;
|
|
|
393
|
|
|
394 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
395
|
|
358
|
396 if (ngx_strcmp(value[i].data, "off") == 0) {
|
|
|
397 scf->builtin_session_cache = NGX_SSL_NO_SCACHE;
|
|
|
398 continue;
|
|
|
399 }
|
|
|
400
|
|
378
|
401 if (ngx_strcmp(value[i].data, "none") == 0) {
|
|
|
402 scf->builtin_session_cache = NGX_SSL_NONE_SCACHE;
|
|
|
403 continue;
|
|
|
404 }
|
|
|
405
|
|
290
|
406 if (ngx_strcmp(value[i].data, "builtin") == 0) {
|
|
|
407 scf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE;
|
|
|
408 continue;
|
|
|
409 }
|
|
|
410
|
|
|
411 if (value[i].len > sizeof("builtin:") - 1
|
|
|
412 && ngx_strncmp(value[i].data, "builtin:", sizeof("builtin:") - 1)
|
|
|
413 == 0)
|
|
|
414 {
|
|
|
415 n = ngx_atoi(value[i].data + sizeof("builtin:") - 1,
|
|
|
416 value[i].len - (sizeof("builtin:") - 1));
|
|
|
417
|
|
|
418 if (n == NGX_ERROR) {
|
|
|
419 goto invalid;
|
|
|
420 }
|
|
|
421
|
|
|
422 scf->builtin_session_cache = n;
|
|
|
423
|
|
|
424 continue;
|
|
|
425 }
|
|
|
426
|
|
|
427 if (value[i].len > sizeof("shared:") - 1
|
|
|
428 && ngx_strncmp(value[i].data, "shared:", sizeof("shared:") - 1)
|
|
|
429 == 0)
|
|
|
430 {
|
|
|
431 len = 0;
|
|
|
432
|
|
|
433 for (j = sizeof("shared:") - 1; j < value[i].len; j++) {
|
|
|
434 if (value[i].data[j] == ':') {
|
|
|
435 break;
|
|
|
436 }
|
|
|
437
|
|
|
438 len++;
|
|
|
439 }
|
|
|
440
|
|
|
441 if (len == 0) {
|
|
|
442 goto invalid;
|
|
|
443 }
|
|
|
444
|
|
|
445 name.len = len;
|
|
|
446 name.data = value[i].data + sizeof("shared:") - 1;
|
|
|
447
|
|
|
448 size.len = value[i].len - j - 1;
|
|
|
449 size.data = name.data + len + 1;
|
|
|
450
|
|
|
451 n = ngx_parse_size(&size);
|
|
|
452
|
|
|
453 if (n == NGX_ERROR) {
|
|
|
454 goto invalid;
|
|
|
455 }
|
|
|
456
|
|
|
457 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
|
|
|
458 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
459 "session cache \"%V\" is too small",
|
|
|
460 &value[i]);
|
|
|
461
|
|
|
462 return NGX_CONF_ERROR;
|
|
|
463 }
|
|
|
464
|
|
|
465 scf->shm_zone = ngx_shared_memory_add(cf, &name, n,
|
|
|
466 &ngx_mail_ssl_module);
|
|
|
467 if (scf->shm_zone == NULL) {
|
|
|
468 return NGX_CONF_ERROR;
|
|
|
469 }
|
|
|
470
|
|
642
|
471 scf->shm_zone->init = ngx_ssl_session_cache_init;
|
|
|
472
|
|
290
|
473 continue;
|
|
|
474 }
|
|
|
475
|
|
|
476 goto invalid;
|
|
|
477 }
|
|
|
478
|
|
|
479 if (scf->shm_zone && scf->builtin_session_cache == NGX_CONF_UNSET) {
|
|
|
480 scf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE;
|
|
|
481 }
|
|
|
482
|
|
|
483 return NGX_CONF_OK;
|
|
|
484
|
|
|
485 invalid:
|
|
|
486
|
|
|
487 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
488 "invalid session cache \"%V\"", &value[i]);
|
|
|
489
|
|
|
490 return NGX_CONF_ERROR;
|
|
|
491 }
|
