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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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632
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12 #define NGX_DEFAULT_CIPHERS "HIGH:!aNULL:!MD5"
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13 #define NGX_DEFAULT_ECDH_CURVE "prime256v1"
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290
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14
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15
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16 static void *ngx_mail_ssl_create_conf(ngx_conf_t *cf);
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17 static char *ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child);
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404
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18
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19 static char *ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd,
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20 void *conf);
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21 static char *ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd,
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22 void *conf);
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290
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23 static char *ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd,
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24 void *conf);
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25
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26
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27 static ngx_conf_enum_t ngx_http_starttls_state[] = {
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28 { ngx_string("off"), NGX_MAIL_STARTTLS_OFF },
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29 { ngx_string("on"), NGX_MAIL_STARTTLS_ON },
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30 { ngx_string("only"), NGX_MAIL_STARTTLS_ONLY },
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31 { ngx_null_string, 0 }
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32 };
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33
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34
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35
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36 static ngx_conf_bitmask_t ngx_mail_ssl_protocols[] = {
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37 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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38 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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39 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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658
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40 { ngx_string("TLSv1.1"), NGX_SSL_TLSv1_1 },
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41 { ngx_string("TLSv1.2"), NGX_SSL_TLSv1_2 },
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290
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42 { ngx_null_string, 0 }
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43 };
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44
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45
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46 static ngx_command_t ngx_mail_ssl_commands[] = {
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47
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48 { ngx_string("ssl"),
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49 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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50 ngx_mail_ssl_enable,
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290
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51 NGX_MAIL_SRV_CONF_OFFSET,
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52 offsetof(ngx_mail_ssl_conf_t, enable),
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53 NULL },
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54
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55 { ngx_string("starttls"),
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56 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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57 ngx_mail_ssl_starttls,
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290
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58 NGX_MAIL_SRV_CONF_OFFSET,
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59 offsetof(ngx_mail_ssl_conf_t, starttls),
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60 ngx_http_starttls_state },
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61
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62 { ngx_string("ssl_certificate"),
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63 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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64 ngx_conf_set_str_slot,
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65 NGX_MAIL_SRV_CONF_OFFSET,
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66 offsetof(ngx_mail_ssl_conf_t, certificate),
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67 NULL },
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68
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69 { ngx_string("ssl_certificate_key"),
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70 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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71 ngx_conf_set_str_slot,
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72 NGX_MAIL_SRV_CONF_OFFSET,
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73 offsetof(ngx_mail_ssl_conf_t, certificate_key),
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74 NULL },
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75
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380
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76 { ngx_string("ssl_dhparam"),
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77 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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78 ngx_conf_set_str_slot,
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79 NGX_MAIL_SRV_CONF_OFFSET,
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80 offsetof(ngx_mail_ssl_conf_t, dhparam),
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81 NULL },
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82
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632
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83 { ngx_string("ssl_ecdh_curve"),
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84 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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85 ngx_conf_set_str_slot,
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86 NGX_MAIL_SRV_CONF_OFFSET,
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87 offsetof(ngx_mail_ssl_conf_t, ecdh_curve),
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88 NULL },
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89
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290
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90 { ngx_string("ssl_protocols"),
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91 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_1MORE,
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92 ngx_conf_set_bitmask_slot,
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93 NGX_MAIL_SRV_CONF_OFFSET,
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94 offsetof(ngx_mail_ssl_conf_t, protocols),
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95 &ngx_mail_ssl_protocols },
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96
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97 { ngx_string("ssl_ciphers"),
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98 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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99 ngx_conf_set_str_slot,
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100 NGX_MAIL_SRV_CONF_OFFSET,
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101 offsetof(ngx_mail_ssl_conf_t, ciphers),
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102 NULL },
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103
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104 { ngx_string("ssl_prefer_server_ciphers"),
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105 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_FLAG,
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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
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111 { ngx_string("ssl_session_cache"),
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112 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE12,
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113 ngx_mail_ssl_session_cache,
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114 NGX_MAIL_SRV_CONF_OFFSET,
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115 0,
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116 NULL },
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117
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118 { ngx_string("ssl_session_timeout"),
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119 NGX_MAIL_MAIN_CONF|NGX_MAIL_SRV_CONF|NGX_CONF_TAKE1,
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120 ngx_conf_set_sec_slot,
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121 NGX_MAIL_SRV_CONF_OFFSET,
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122 offsetof(ngx_mail_ssl_conf_t, session_timeout),
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123 NULL },
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124
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125 ngx_null_command
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126 };
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127
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128
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129 static ngx_mail_module_t ngx_mail_ssl_module_ctx = {
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336
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130 NULL, /* protocol */
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131
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290
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132 NULL, /* create main configuration */
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133 NULL, /* init main configuration */
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134
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135 ngx_mail_ssl_create_conf, /* create server configuration */
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136 ngx_mail_ssl_merge_conf /* merge server configuration */
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137 };
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138
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139
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140 ngx_module_t ngx_mail_ssl_module = {
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141 NGX_MODULE_V1,
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142 &ngx_mail_ssl_module_ctx, /* module context */
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143 ngx_mail_ssl_commands, /* module directives */
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144 NGX_MAIL_MODULE, /* module type */
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145 NULL, /* init master */
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146 NULL, /* init module */
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147 NULL, /* init process */
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148 NULL, /* init thread */
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149 NULL, /* exit thread */
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150 NULL, /* exit process */
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151 NULL, /* exit master */
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152 NGX_MODULE_V1_PADDING
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153 };
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154
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155
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156 static ngx_str_t ngx_mail_ssl_sess_id_ctx = ngx_string("MAIL");
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157
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158
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159 static void *
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160 ngx_mail_ssl_create_conf(ngx_conf_t *cf)
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161 {
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162 ngx_mail_ssl_conf_t *scf;
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163
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164 scf = ngx_pcalloc(cf->pool, sizeof(ngx_mail_ssl_conf_t));
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165 if (scf == NULL) {
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496
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166 return NULL;
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290
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167 }
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168
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169 /*
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170 * set by ngx_pcalloc():
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171 *
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172 * scf->protocols = 0;
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380
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173 * scf->certificate = { 0, NULL };
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174 * scf->certificate_key = { 0, NULL };
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175 * scf->dhparam = { 0, NULL };
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632
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176 * scf->ecdh_curve = { 0, NULL };
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570
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177 * scf->ciphers = { 0, NULL };
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290
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178 * scf->shm_zone = NULL;
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179 */
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180
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181 scf->enable = NGX_CONF_UNSET;
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482
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182 scf->starttls = NGX_CONF_UNSET_UINT;
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183 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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184 scf->builtin_session_cache = NGX_CONF_UNSET;
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185 scf->session_timeout = NGX_CONF_UNSET;
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186
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187 return scf;
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188 }
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189
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190
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191 static char *
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192 ngx_mail_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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193 {
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194 ngx_mail_ssl_conf_t *prev = parent;
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195 ngx_mail_ssl_conf_t *conf = child;
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196
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197 char *mode;
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290
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198 ngx_pool_cleanup_t *cln;
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199
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200 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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201 ngx_conf_merge_uint_value(conf->starttls, prev->starttls,
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202 NGX_MAIL_STARTTLS_OFF);
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290
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203
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204 ngx_conf_merge_value(conf->session_timeout,
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205 prev->session_timeout, 300);
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206
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207 ngx_conf_merge_value(conf->prefer_server_ciphers,
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208 prev->prefer_server_ciphers, 0);
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209
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210 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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658
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211 (NGX_CONF_BITMASK_SET|NGX_SSL_SSLv3|NGX_SSL_TLSv1
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212 |NGX_SSL_TLSv1_1|NGX_SSL_TLSv1_2));
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290
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213
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214 ngx_conf_merge_str_value(conf->certificate, prev->certificate, "");
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215 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key, "");
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290
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216
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380
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217 ngx_conf_merge_str_value(conf->dhparam, prev->dhparam, "");
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218
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632
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219 ngx_conf_merge_str_value(conf->ecdh_curve, prev->ecdh_curve,
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220 NGX_DEFAULT_ECDH_CURVE);
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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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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 if (conf->prefer_server_ciphers) {
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301 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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302 }
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303
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632
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304 SSL_CTX_set_tmp_rsa_callback(conf->ssl.ctx, ngx_ssl_rsa512_key_callback);
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290
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305
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380
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306 if (ngx_ssl_dhparam(cf, &conf->ssl, &conf->dhparam) != NGX_OK) {
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307 return NGX_CONF_ERROR;
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308 }
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309
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290
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310 ngx_conf_merge_value(conf->builtin_session_cache,
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378
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311 prev->builtin_session_cache, NGX_SSL_NONE_SCACHE);
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290
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312
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313 if (conf->shm_zone == NULL) {
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314 conf->shm_zone = prev->shm_zone;
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315 }
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316
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317 if (ngx_ssl_session_cache(&conf->ssl, &ngx_mail_ssl_sess_id_ctx,
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318 conf->builtin_session_cache,
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319 conf->shm_zone, conf->session_timeout)
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320 != NGX_OK)
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321 {
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322 return NGX_CONF_ERROR;
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323 }
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324
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325 return NGX_CONF_OK;
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326 }
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327
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328
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329 static char *
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404
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330 ngx_mail_ssl_enable(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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331 {
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332 ngx_mail_ssl_conf_t *scf = conf;
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333
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334 char *rv;
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335
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336 rv = ngx_conf_set_flag_slot(cf, cmd, conf);
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337
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338 if (rv != NGX_CONF_OK) {
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339 return rv;
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340 }
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341
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342 if (scf->enable && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
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343 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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344 "\"starttls\" directive conflicts with \"ssl on\"");
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345 return NGX_CONF_ERROR;
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346 }
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347
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348 scf->file = cf->conf_file->file.name.data;
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349 scf->line = cf->conf_file->line;
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350
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351 return NGX_CONF_OK;
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352 }
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353
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354
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355 static char *
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356 ngx_mail_ssl_starttls(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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357 {
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358 ngx_mail_ssl_conf_t *scf = conf;
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359
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360 char *rv;
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361
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362 rv = ngx_conf_set_enum_slot(cf, cmd, conf);
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363
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364 if (rv != NGX_CONF_OK) {
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365 return rv;
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366 }
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367
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368 if (scf->enable == 1 && (ngx_int_t) scf->starttls > NGX_MAIL_STARTTLS_OFF) {
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369 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
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370 "\"ssl\" directive conflicts with \"starttls\"");
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371 return NGX_CONF_ERROR;
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372 }
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373
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374 scf->file = cf->conf_file->file.name.data;
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375 scf->line = cf->conf_file->line;
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376
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377 return NGX_CONF_OK;
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378 }
|
|
|
379
|
|
|
380
|
|
|
381 static char *
|
|
290
|
382 ngx_mail_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
383 {
|
|
|
384 ngx_mail_ssl_conf_t *scf = conf;
|
|
|
385
|
|
|
386 size_t len;
|
|
|
387 ngx_str_t *value, name, size;
|
|
|
388 ngx_int_t n;
|
|
|
389 ngx_uint_t i, j;
|
|
|
390
|
|
|
391 value = cf->args->elts;
|
|
|
392
|
|
|
393 for (i = 1; i < cf->args->nelts; i++) {
|
|
|
394
|
|
358
|
395 if (ngx_strcmp(value[i].data, "off") == 0) {
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|
|
396 scf->builtin_session_cache = NGX_SSL_NO_SCACHE;
|
|
|
397 continue;
|
|
|
398 }
|
|
|
399
|
|
378
|
400 if (ngx_strcmp(value[i].data, "none") == 0) {
|
|
|
401 scf->builtin_session_cache = NGX_SSL_NONE_SCACHE;
|
|
|
402 continue;
|
|
|
403 }
|
|
|
404
|
|
290
|
405 if (ngx_strcmp(value[i].data, "builtin") == 0) {
|
|
|
406 scf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE;
|
|
|
407 continue;
|
|
|
408 }
|
|
|
409
|
|
|
410 if (value[i].len > sizeof("builtin:") - 1
|
|
|
411 && ngx_strncmp(value[i].data, "builtin:", sizeof("builtin:") - 1)
|
|
|
412 == 0)
|
|
|
413 {
|
|
|
414 n = ngx_atoi(value[i].data + sizeof("builtin:") - 1,
|
|
|
415 value[i].len - (sizeof("builtin:") - 1));
|
|
|
416
|
|
|
417 if (n == NGX_ERROR) {
|
|
|
418 goto invalid;
|
|
|
419 }
|
|
|
420
|
|
|
421 scf->builtin_session_cache = n;
|
|
|
422
|
|
|
423 continue;
|
|
|
424 }
|
|
|
425
|
|
|
426 if (value[i].len > sizeof("shared:") - 1
|
|
|
427 && ngx_strncmp(value[i].data, "shared:", sizeof("shared:") - 1)
|
|
|
428 == 0)
|
|
|
429 {
|
|
|
430 len = 0;
|
|
|
431
|
|
|
432 for (j = sizeof("shared:") - 1; j < value[i].len; j++) {
|
|
|
433 if (value[i].data[j] == ':') {
|
|
|
434 break;
|
|
|
435 }
|
|
|
436
|
|
|
437 len++;
|
|
|
438 }
|
|
|
439
|
|
|
440 if (len == 0) {
|
|
|
441 goto invalid;
|
|
|
442 }
|
|
|
443
|
|
|
444 name.len = len;
|
|
|
445 name.data = value[i].data + sizeof("shared:") - 1;
|
|
|
446
|
|
|
447 size.len = value[i].len - j - 1;
|
|
|
448 size.data = name.data + len + 1;
|
|
|
449
|
|
|
450 n = ngx_parse_size(&size);
|
|
|
451
|
|
|
452 if (n == NGX_ERROR) {
|
|
|
453 goto invalid;
|
|
|
454 }
|
|
|
455
|
|
|
456 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
|
|
|
457 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
458 "session cache \"%V\" is too small",
|
|
|
459 &value[i]);
|
|
|
460
|
|
|
461 return NGX_CONF_ERROR;
|
|
|
462 }
|
|
|
463
|
|
|
464 scf->shm_zone = ngx_shared_memory_add(cf, &name, n,
|
|
|
465 &ngx_mail_ssl_module);
|
|
|
466 if (scf->shm_zone == NULL) {
|
|
|
467 return NGX_CONF_ERROR;
|
|
|
468 }
|
|
|
469
|
|
642
|
470 scf->shm_zone->init = ngx_ssl_session_cache_init;
|
|
|
471
|
|
290
|
472 continue;
|
|
|
473 }
|
|
|
474
|
|
|
475 goto invalid;
|
|
|
476 }
|
|
|
477
|
|
|
478 if (scf->shm_zone && scf->builtin_session_cache == NGX_CONF_UNSET) {
|
|
|
479 scf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE;
|
|
|
480 }
|
|
|
481
|
|
|
482 return NGX_CONF_OK;
|
|
|
483
|
|
|
484 invalid:
|
|
|
485
|
|
|
486 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
487 "invalid session cache \"%V\"", &value[i]);
|
|
|
488
|
|
|
489 return NGX_CONF_ERROR;
|
|
|
490 }
|
