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539
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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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547
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14 #define NGX_DEFLAUT_CIPHERS "ALL:!ADH:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP"
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539
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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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19
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563
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20 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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21
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22 static char *ngx_imap_ssl_nosupported(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 static char ngx_imap_ssl_openssl097[] = "OpenSSL 0.9.7 and higher";
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26
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27 #endif
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28
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539
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29
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583
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30 static ngx_conf_enum_t ngx_http_starttls_state[] = {
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31 { ngx_string("off"), NGX_IMAP_STARTTLS_OFF },
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32 { ngx_string("on"), NGX_IMAP_STARTTLS_ON },
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33 { ngx_string("only"), NGX_IMAP_STARTTLS_ONLY },
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34 { ngx_null_string, 0 }
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35 };
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36
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37
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38
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577
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39 static ngx_conf_bitmask_t ngx_imap_ssl_protocols[] = {
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547
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40 { ngx_string("SSLv2"), NGX_SSL_SSLv2 },
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41 { ngx_string("SSLv3"), NGX_SSL_SSLv3 },
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42 { ngx_string("TLSv1"), NGX_SSL_TLSv1 },
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43 { ngx_null_string, 0 }
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44 };
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45
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46
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539
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47 static ngx_command_t ngx_imap_ssl_commands[] = {
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48
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49 { ngx_string("ssl"),
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50 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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51 ngx_conf_set_flag_slot,
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52 NGX_IMAP_SRV_CONF_OFFSET,
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53 offsetof(ngx_imap_ssl_conf_t, enable),
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54 NULL },
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55
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583
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56 { ngx_string("starttls"),
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57 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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58 ngx_conf_set_enum_slot,
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59 NGX_IMAP_SRV_CONF_OFFSET,
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60 offsetof(ngx_imap_ssl_conf_t, starttls),
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61 ngx_http_starttls_state },
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62
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539
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63 { ngx_string("ssl_certificate"),
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64 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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65 ngx_conf_set_str_slot,
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66 NGX_IMAP_SRV_CONF_OFFSET,
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67 offsetof(ngx_imap_ssl_conf_t, certificate),
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68 NULL },
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69
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70 { ngx_string("ssl_certificate_key"),
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71 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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72 ngx_conf_set_str_slot,
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73 NGX_IMAP_SRV_CONF_OFFSET,
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74 offsetof(ngx_imap_ssl_conf_t, certificate_key),
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75 NULL },
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76
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547
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77 { ngx_string("ssl_protocols"),
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563
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78 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_1MORE,
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547
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79 ngx_conf_set_bitmask_slot,
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80 NGX_IMAP_SRV_CONF_OFFSET,
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81 offsetof(ngx_imap_ssl_conf_t, protocols),
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82 &ngx_imap_ssl_protocols },
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83
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539
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84 { ngx_string("ssl_ciphers"),
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85 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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86 ngx_conf_set_str_slot,
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87 NGX_IMAP_SRV_CONF_OFFSET,
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88 offsetof(ngx_imap_ssl_conf_t, ciphers),
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89 NULL },
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90
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547
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91 { ngx_string("ssl_prefer_server_ciphers"),
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92 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_FLAG,
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563
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93 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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547
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94 ngx_conf_set_flag_slot,
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95 NGX_IMAP_SRV_CONF_OFFSET,
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96 offsetof(ngx_imap_ssl_conf_t, prefer_server_ciphers),
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97 NULL },
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563
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98 #else
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99 ngx_imap_ssl_nosupported, 0, 0, ngx_imap_ssl_openssl097 },
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100 #endif
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101
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573
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102 { ngx_string("ssl_session_timeout"),
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103 NGX_IMAP_MAIN_CONF|NGX_IMAP_SRV_CONF|NGX_CONF_TAKE1,
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104 ngx_conf_set_sec_slot,
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105 NGX_IMAP_SRV_CONF_OFFSET,
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106 offsetof(ngx_imap_ssl_conf_t, session_timeout),
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107 NULL },
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547
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108
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539
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109 ngx_null_command
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110 };
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111
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112
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113 static ngx_imap_module_t ngx_imap_ssl_module_ctx = {
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114 NULL, /* create main configuration */
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115 NULL, /* init main configuration */
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116
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117 ngx_imap_ssl_create_conf, /* create server configuration */
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118 ngx_imap_ssl_merge_conf /* merge server configuration */
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119 };
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120
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121
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122 ngx_module_t ngx_imap_ssl_module = {
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123 NGX_MODULE_V1,
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124 &ngx_imap_ssl_module_ctx, /* module context */
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125 ngx_imap_ssl_commands, /* module directives */
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126 NGX_IMAP_MODULE, /* module type */
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541
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127 NULL, /* init master */
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539
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128 NULL, /* init module */
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541
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129 NULL, /* init process */
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130 NULL, /* init thread */
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131 NULL, /* exit thread */
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132 NULL, /* exit process */
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133 NULL, /* exit master */
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134 NGX_MODULE_V1_PADDING
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539
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135 };
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136
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137
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543
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138 static u_char ngx_imap_session_id_ctx[] = "IMAP";
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139
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140
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539
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141 static void *
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142 ngx_imap_ssl_create_conf(ngx_conf_t *cf)
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577
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143 {
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539
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144 ngx_imap_ssl_conf_t *scf;
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577
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145
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539
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146 scf = ngx_pcalloc(cf->pool, sizeof(ngx_imap_ssl_conf_t));
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147 if (scf == NULL) {
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148 return NGX_CONF_ERROR;
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149 }
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150
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151 /*
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577
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152 * set by ngx_pcalloc():
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539
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153 *
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154 * scf->protocols = 0;
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155 *
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539
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156 * scf->certificate.len = 0;
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157 * scf->certificate.data = NULL;
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158 * scf->certificate_key.len = 0;
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159 * scf->certificate_key.data = NULL;
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160 * scf->ciphers.len = 0;
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161 * scf->ciphers.data = NULL;
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162 */
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163
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164 scf->enable = NGX_CONF_UNSET;
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583
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165 scf->starttls = NGX_CONF_UNSET;
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573
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166 scf->session_timeout = NGX_CONF_UNSET;
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167 scf->prefer_server_ciphers = NGX_CONF_UNSET;
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539
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168
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169 return scf;
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170 }
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171
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172
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173 static char *
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174 ngx_imap_ssl_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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175 {
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176 ngx_imap_ssl_conf_t *prev = parent;
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177 ngx_imap_ssl_conf_t *conf = child;
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178
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563
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179 ngx_pool_cleanup_t *cln;
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180
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539
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181 ngx_conf_merge_value(conf->enable, prev->enable, 0);
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583
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182 ngx_conf_merge_value(conf->starttls, prev->starttls, NGX_IMAP_STARTTLS_OFF);
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183
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184 if (conf->enable == 0 && conf->starttls == NGX_IMAP_STARTTLS_OFF) {
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539
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185 return NGX_CONF_OK;
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186 }
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187
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573
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188 ngx_conf_merge_value(conf->session_timeout,
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189 prev->session_timeout, 300);
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190
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191 ngx_conf_merge_value(conf->prefer_server_ciphers,
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192 prev->prefer_server_ciphers, 0);
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193
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194 ngx_conf_merge_bitmask_value(conf->protocols, prev->protocols,
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195 (NGX_CONF_BITMASK_SET
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196 |NGX_SSL_SSLv2|NGX_SSL_SSLv3|NGX_SSL_TLSv1));
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197
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539
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198 ngx_conf_merge_str_value(conf->certificate, prev->certificate,
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199 NGX_DEFLAUT_CERTIFICATE);
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200
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201 ngx_conf_merge_str_value(conf->certificate_key, prev->certificate_key,
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202 NGX_DEFLAUT_CERTIFICATE_KEY);
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203
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547
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204 ngx_conf_merge_str_value(conf->ciphers, prev->ciphers, NGX_DEFLAUT_CIPHERS);
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539
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205
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206
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207 conf->ssl.log = cf->log;
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539
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208
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209 if (ngx_ssl_create(&conf->ssl, conf->protocols, NULL) != NGX_OK) {
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539
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210 return NGX_CONF_ERROR;
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211 }
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212
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213 cln = ngx_pool_cleanup_add(cf->pool, 0);
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214 if (cln == NULL) {
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539
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215 return NGX_CONF_ERROR;
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216 }
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217
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563
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218 cln->handler = ngx_ssl_cleanup_ctx;
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219 cln->data = &conf->ssl;
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220
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221 if (ngx_ssl_certificate(cf, &conf->ssl, &conf->certificate,
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222 &conf->certificate_key)
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223 != NGX_OK)
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547
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224 {
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225 return NGX_CONF_ERROR;
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226 }
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539
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227
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228 if (conf->ciphers.len) {
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547
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229 if (SSL_CTX_set_cipher_list(conf->ssl.ctx,
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563
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230 (const char *) conf->ciphers.data)
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231 == 0)
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539
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232 {
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233 ngx_ssl_error(NGX_LOG_EMERG, cf->log, 0,
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234 "SSL_CTX_set_cipher_list(\"%V\") failed",
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235 &conf->ciphers);
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236 }
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237 }
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238
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563
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239 #ifdef SSL_OP_CIPHER_SERVER_PREFERENCE
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240
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241 if (conf->prefer_server_ciphers) {
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242 SSL_CTX_set_options(conf->ssl.ctx, SSL_OP_CIPHER_SERVER_PREFERENCE);
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243 }
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244
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245 #endif
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246
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547
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247 if (ngx_ssl_generate_rsa512_key(&conf->ssl) != NGX_OK) {
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539
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248 return NGX_CONF_ERROR;
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249 }
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250
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251 SSL_CTX_set_session_cache_mode(conf->ssl.ctx, SSL_SESS_CACHE_SERVER);
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539
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252
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547
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253 SSL_CTX_set_session_id_context(conf->ssl.ctx, ngx_imap_session_id_ctx,
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543
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254 sizeof(ngx_imap_session_id_ctx) - 1);
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255
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573
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256 SSL_CTX_set_timeout(conf->ssl.ctx, conf->session_timeout);
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257
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539
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258 return NGX_CONF_OK;
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259 }
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563
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260
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577
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261
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563
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262 #if !defined (SSL_OP_CIPHER_SERVER_PREFERENCE)
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577
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263
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563
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264 static char *
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265 ngx_imap_ssl_nosupported(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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577
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266 {
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563
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267 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
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268 "\"%V\" directive is available only in %s,",
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269 &cmd->name, cmd->post);
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270
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271 return NGX_CONF_ERROR;
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272 }
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273
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274 #endif
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