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