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88
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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_imap.h>
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10
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11
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12 #define NGX_DEFLAUT_CERTIFICATE "cert.pem"
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13 #define NGX_DEFLAUT_CERTIFICATE_KEY "cert.pem"
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96
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14 #define NGX_DEFLAUT_CIPHERS "ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP"
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88
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15
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16
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17 static void *ngx_imap_ssl_create_conf(ngx_conf_t *cf);
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18 static char *ngx_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child);
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272
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19 static char *ngx_imap_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd,
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20 void *conf);
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88
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21
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112
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22 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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23
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24 static char *ngx_imap_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd,
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25 void *conf);
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26
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27 static char ngx_imap_ssl_openssl097[] = "OpenSSL 0.9.7 and higher";
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28
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29 #endif
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30
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88
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31
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132
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32 static ngx_conf_enum_t ngx_http_starttls_state[] = {
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33 { ngx_string("off"), NGX_IMAP_STARTTLS_OFF },
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34 { ngx_string("on"), NGX_IMAP_STARTTLS_ON },
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35 { ngx_string("only"), NGX_IMAP_STARTTLS_ONLY },
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36 { ngx_null_string, 0 }
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37 };
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38
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39
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40
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126
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41 static ngx_conf_bitmask_t ngx_imap_ssl_protocols[] = {
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96
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42 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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43 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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44 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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45 { ngx_null_string, 0 }
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46 };
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47
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48
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88
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49 static ngx_command_t ngx_imap_ssl_commands[] = {
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50
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51 { ngx_string("ssl"),
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52 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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53 ngx_conf_set_flag_slot,
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54 NGX_IMAP_SRV_CONF_OFFSET,
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55 offsetof(ngx_imap_ssl_conf_t, enable),
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56 NULL },
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57
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132
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58 { ngx_string("starttls"),
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59 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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60 ngx_conf_set_enum_slot,
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61 NGX_IMAP_SRV_CONF_OFFSET,
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62 offsetof(ngx_imap_ssl_conf_t, starttls),
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63 ngx_http_starttls_state },
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64
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88
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65 { ngx_string("ssl_certificate"),
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66 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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67 ngx_conf_set_str_slot,
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68 NGX_IMAP_SRV_CONF_OFFSET,
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69 offsetof(ngx_imap_ssl_conf_t, certificate),
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70 NULL },
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71
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72 { ngx_string("ssl_certificate_key"),
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73 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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74 ngx_conf_set_str_slot,
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75 NGX_IMAP_SRV_CONF_OFFSET,
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76 offsetof(ngx_imap_ssl_conf_t, certificate_key),
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77 NULL },
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78
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96
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79 { ngx_string("ssl_protocols"),
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112
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80 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_1MORE,
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96
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81 ngx_conf_set_bitmask_slot,
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82 NGX_IMAP_SRV_CONF_OFFSET,
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83 offsetof(ngx_imap_ssl_conf_t, protocols),
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84 &ngx_imap_ssl_protocols },
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85
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88
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86 { ngx_string("ssl_ciphers"),
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87 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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88 ngx_conf_set_str_slot,
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89 NGX_IMAP_SRV_CONF_OFFSET,
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90 offsetof(ngx_imap_ssl_conf_t, ciphers),
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91 NULL },
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92
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96
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93 { ngx_string("ssl_prefer_server_ciphers"),
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94 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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112
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95 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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96
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96 ngx_conf_set_flag_slot,
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97 NGX_IMAP_SRV_CONF_OFFSET,
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98 offsetof(ngx_imap_ssl_conf_t, prefer_server_ciphers),
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99 NULL },
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112
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100 #else
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101 ngx_imap_ssl_nosupported, 0, 0, ngx_imap_ssl_openssl097 },
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102 #endif
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103
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272
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104 { ngx_string("ssl_session_cache"),
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105 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE12,
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106 ngx_imap_ssl_session_cache,
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107 NGX_IMAP_SRV_CONF_OFFSET,
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108 0,
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109 NULL },
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110
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122
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111 { ngx_string("ssl_session_timeout"),
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112 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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113 ngx_conf_set_sec_slot,
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114 NGX_IMAP_SRV_CONF_OFFSET,
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115 offsetof(ngx_imap_ssl_conf_t, session_timeout),
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116 NULL },
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96
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117
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88
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118 ngx_null_command
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119 };
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120
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121
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122 static ngx_imap_module_t ngx_imap_ssl_module_ctx = {
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123 NULL, /* create main configuration */
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124 NULL, /* init main configuration */
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125
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126 ngx_imap_ssl_create_conf, /* create server configuration */
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127 ngx_imap_ssl_merge_conf /* merge server configuration */
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128 };
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129
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130
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131 ngx_module_t ngx_imap_ssl_module = {
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132 NGX_MODULE_V1,
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133 &ngx_imap_ssl_module_ctx, /* module context */
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134 ngx_imap_ssl_commands, /* module directives */
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135 NGX_IMAP_MODULE, /* module type */
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90
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136 NULL, /* init master */
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88
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137 NULL, /* init module */
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90
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138 NULL, /* init process */
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139 NULL, /* init thread */
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140 NULL, /* exit thread */
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141 NULL, /* exit process */
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142 NULL, /* exit master */
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143 NGX_MODULE_V1_PADDING
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88
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144 };
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145
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146
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272
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147 static ngx_str_t ngx_imap_ssl_sess_id_ctx = ngx_string("IMAP");
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92
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148
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149
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88
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150 static void *
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151 ngx_imap_ssl_create_conf(ngx_conf_t *cf)
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126
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152 {
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88
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153 ngx_imap_ssl_conf_t *scf;
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126
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154
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88
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155 scf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_ssl_conf_t));
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156 if (scf == NULL) {
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157 return NGX_CONF_ERROR;
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158 }
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159
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160 /*
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126
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161 * set by ngx_pcalloc():
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88
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162 *
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96
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163 * scf->protocols = 0;
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88
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164 * scf->certificate.len = 0;
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165 * scf->certificate.data = NULL;
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166 * scf->certificate_key.len = 0;
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167 * scf->certificate_key.data = NULL;
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168 * scf->ciphers.len = 0;
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169 * scf->ciphers.data = NULL;
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272
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170 * scf->shm_zone = NULL;
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88
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171 */
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172
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173 scf->enable = NGX_CONF_UNSET;
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132
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174 scf->starttls = NGX_CONF_UNSET;
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272
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175 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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176 scf->builtin_session_cache = NGX_CONF_UNSET;
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122
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177 scf->session_timeout = NGX_CONF_UNSET;
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88
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178
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179 return scf;
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180 }
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181
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182
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183 static char *
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184 ngx_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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185 {
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186 ngx_imap_ssl_conf_t *prev = parent;
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187 ngx_imap_ssl_conf_t *conf = child;
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188
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112
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189 ngx_pool_cleanup_t *cln;
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190
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88
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191 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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132
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192 ngx_conf_merge_value(conf->starttls, prev->starttls, NGX_IMAP_STARTTLS_OFF);
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88
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193
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132
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194 if (conf->enable == 0 && conf->starttls == NGX_IMAP_STARTTLS_OFF) {
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88
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195 return NGX_CONF_OK;
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196 }
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197
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122
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198 ngx_conf_merge_value(conf->session_timeout,
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199 prev->session_timeout, 300);
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200
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96
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201 ngx_conf_merge_value(conf->prefer_server_ciphers,
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202 prev->prefer_server_ciphers, 0);
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203
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204 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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205 (NGX_CONF_BITMASK_SET
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206 |NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
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207
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88
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208 ngx_conf_merge_str_value(conf->certificate, prev->certificate,
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209 NGX_DEFLAUT_CERTIFICATE);
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210
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211 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
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212 NGX_DEFLAUT_CERTIFICATE_KEY);
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213
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96
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214 ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFLAUT_CIPHERS);
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88
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215
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216
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96
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217 conf->ssl.log = cf->log;
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88
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218
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272
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219 if (ngx_ssl_create(&conf->ssl, conf->protocols, NULL) != NGX_OK) {
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88
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220 return NGX_CONF_ERROR;
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221 }
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222
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112
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223 cln = ngx_pool_cleanup_add(cf->pool, 0);
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224 if (cln == NULL) {
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88
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225 return NGX_CONF_ERROR;
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226 }
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227
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112
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228 cln->handler = ngx_ssl_cleanup_ctx;
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229 cln->data = &conf->ssl;
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230
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231 if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
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232 &conf->certificate_key)
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233 != NGX_OK)
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96
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234 {
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235 return NGX_CONF_ERROR;
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236 }
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88
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237
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238 if (conf->ciphers.len) {
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96
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239 if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
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112
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240 (const char *) conf->ciphers.data)
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241 == 0)
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88
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242 {
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243 ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
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244 "SSL_CTX_set_cipher_list(\"%V\") failed",
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245 &conf->ciphers);
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246 }
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247 }
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248
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112
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249 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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250
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251 if (conf->prefer_server_ciphers) {
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252 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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253 }
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254
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255 #endif
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256
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96
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257 if (ngx_ssl_generate_rsa512_key(&conf->ssl) != NGX_OK) {
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88
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258 return NGX_CONF_ERROR;
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259 }
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260
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272
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261 ngx_conf_merge_value(conf->builtin_session_cache,
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262 prev->builtin_session_cache,
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263 NGX_SSL_DFLT_BUILTIN_SCACHE);
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264
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265 if (conf->shm_zone == NULL) {
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266 conf->shm_zone = prev->shm_zone;
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267 }
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88
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268
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272
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269 if (ngx_ssl_session_cache(&conf->ssl, &ngx_imap_ssl_sess_id_ctx,
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270 conf->builtin_session_cache,
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271 conf->shm_zone, conf->session_timeout)
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272 != NGX_OK)
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273 {
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274 return NGX_CONF_ERROR;
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275 }
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122
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276
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88
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277 return NGX_CONF_OK;
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278 }
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112
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279
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126
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280
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272
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281 static char *
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282 ngx_imap_ssl_session_cache(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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283 {
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284 ngx_imap_ssl_conf_t *scf = conf;
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285
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286 size_t len;
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287 ngx_str_t *value, name, size;
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288 ngx_int_t n;
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289 ngx_uint_t i, j;
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290
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291 value = cf->args->elts;
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292
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293 for (i = 1; i < cf->args->nelts; i++) {
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294
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295 if (ngx_strcmp(value[i].data, "builtin") == 0) {
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296 scf->builtin_session_cache = NGX_SSL_DFLT_BUILTIN_SCACHE;
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297 continue;
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298 }
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299
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300 if (value[i].len > sizeof("builtin:") - 1
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301 && ngx_strncmp(value[i].data, "builtin:", sizeof("builtin:") - 1)
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302 == 0)
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303 {
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304 n = ngx_atoi(value[i].data + sizeof("builtin:") - 1,
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305 value[i].len - (sizeof("builtin:") - 1));
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306
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307 if (n == NGX_ERROR) {
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308 goto invalid;
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309 }
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310
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311 scf->builtin_session_cache = n;
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312
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313 continue;
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314 }
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315
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316 if (value[i].len > sizeof("shared:") - 1
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317 && ngx_strncmp(value[i].data, "shared:", sizeof("shared:") - 1)
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318 == 0)
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319 {
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320 len = 0;
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321
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322 for (j = sizeof("shared:") - 1; j < value[i].len; j++) {
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323 if (value[i].data[j] == ':') {
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324 break;
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325 }
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326
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327 len++;
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328 }
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329
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330 if (len == 0) {
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331 goto invalid;
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332 }
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333
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334 name.len = len;
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335 name.data = value[i].data + sizeof("shared:") - 1;
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336
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337 size.len = value[i].len - j - 1;
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338 size.data = name.data + len + 1;
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339
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340 n = ngx_parse_size(&size);
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341
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342 if (n == NGX_ERROR) {
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343 goto invalid;
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344 }
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345
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346 if (n < (ngx_int_t) (8 * ngx_pagesize)) {
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347 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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348 "session cache \"%V\" is too small",
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349 &value[i]);
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350
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351 return NGX_CONF_ERROR;
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352 }
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353
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354 scf->shm_zone = ngx_shared_memory_add(cf, &name, n,
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355 &ngx_imap_ssl_module);
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356 if (scf->shm_zone == NULL) {
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357 return NGX_CONF_ERROR;
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358 }
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359
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360 continue;
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361 }
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362
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363 goto invalid;
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364 }
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365
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366 if (scf->shm_zone && scf->builtin_session_cache == NGX_CONF_UNSET) {
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367 scf->builtin_session_cache = NGX_SSL_NO_BUILTIN_SCACHE;
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368 }
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369
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370 return NGX_CONF_OK;
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371
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372 invalid:
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373
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374 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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375 "invalid session cache \"%V\"", &value[i]);
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376
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377 return NGX_CONF_ERROR;
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378 }
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379
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380
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112
|
381 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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126
|
382
|
|
112
|
383 static char *
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384 ngx_imap_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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|
126
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385 {
|
|
112
|
386 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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|
|
387 "\"%V\" directive is available only in %s,",
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388 &cmd->name, cmd->post);
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|
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389
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390 return NGX_CONF_ERROR;
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|
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391 }
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392
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393 #endif
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