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0
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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_event.h>
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10
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28
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11 #include <openssl/engine.h>
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12
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0
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13
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22
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14 static void ngx_ssl_write_handler(ngx_event_t *wev);
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18
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15 static ssize_t ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size);
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22
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16 static void ngx_ssl_read_handler(ngx_event_t *rev);
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0
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17
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18
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19 ngx_int_t ngx_ssl_init(ngx_log_t *log)
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20 {
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28
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21 ENGINE *engine;
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22
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0
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23 SSL_library_init();
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24 SSL_load_error_strings();
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28
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25 ENGINE_load_builtin_engines();
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0
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26
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27 return NGX_OK;
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28 }
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29
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30
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31 ngx_int_t ngx_ssl_create_session(ngx_ssl_ctx_t *ssl_ctx, ngx_connection_t *c,
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32 ngx_uint_t flags)
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33 {
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34 ngx_ssl_t *ssl;
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35
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36 if (!(ssl = ngx_pcalloc(c->pool, sizeof(ngx_ssl_t)))) {
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37 return NGX_ERROR;
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38 }
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39
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40 if (!(ssl->buf = ngx_create_temp_buf(c->pool, NGX_SSL_BUFSIZE))) {
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41 return NGX_ERROR;
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42 }
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43
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44 if (flags & NGX_SSL_BUFFER) {
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45 ssl->buffer = 1;
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46 }
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47
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48 ssl->ssl = SSL_new(ssl_ctx);
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49
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50 if (ssl->ssl == NULL) {
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51 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_new() failed");
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52 return NGX_ERROR;
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53 }
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54
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55 if (SSL_set_fd(ssl->ssl, c->fd) == 0) {
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56 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_set_fd() failed");
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57 return NGX_ERROR;
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58 }
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59
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60 SSL_set_accept_state(ssl->ssl);
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61
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62 c->ssl = ssl;
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63
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64 return NGX_OK;
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65 }
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66
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67
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18
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68 ssize_t ngx_ssl_recv(ngx_connection_t *c, u_char *buf, size_t size)
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0
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69 {
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70 int n, sslerr;
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71 ngx_err_t err;
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72 char *handshake;
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73
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74 n = SSL_read(c->ssl->ssl, buf, size);
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75
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76 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_read: %d", n);
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77
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78 if (n > 0) {
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28
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79
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80 #if (NGX_DEBUG)
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81
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82 if (!c->ssl->handshaked && SSL_is_init_finished(c->ssl->ssl)) {
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83 char buf[129], *s, *d;
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84 SSL_CIPHER *cipher;
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85
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86 c->ssl->handshaked = 1;
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87
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88 cipher = SSL_get_current_cipher(c->ssl->ssl);
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89
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90 if (cipher) {
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91 SSL_CIPHER_description(cipher, &buf[1], 128);
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92
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93 for (s = &buf[1], d = buf; *s; s++) {
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94 if (*s == ' ' && *d == ' ') {
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95 continue;
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96 }
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97
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98 if (*s == '\n' || *s == '\r') {
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99 continue;
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100 }
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101
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102 *++d = *s;
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103 }
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104
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105 if (*d != ' ') {
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106 d++;
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107 }
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108
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109 *d = '\0';
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110
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111 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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112 "SSL cipher: \"%s\"", &buf[1]);
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113 } else {
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114 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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115 "SSL no shared ciphers");
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116 }
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117 }
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118
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119 #endif
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120
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22
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121 if (c->ssl->saved_write_handler) {
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122
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123 c->write->event_handler = c->ssl->saved_write_handler;
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124 c->ssl->saved_write_handler = NULL;
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125 c->write->ready = 1;
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126
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127 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
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128 return NGX_ERROR;
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129 }
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130
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131 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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132 return NGX_ERROR;
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133 }
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134
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135 ngx_post_event(c->write);
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136
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137 ngx_mutex_unlock(ngx_posted_events_mutex);
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138 }
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139
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0
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140 return n;
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141 }
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142
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2
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143 if (!SSL_is_init_finished(c->ssl->ssl)) {
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10
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144 handshake = " in SSL handshake";
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2
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145
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146 } else {
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147 handshake = "";
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148 }
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149
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0
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150 sslerr = SSL_get_error(c->ssl->ssl, n);
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151
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152 err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
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153
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154 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
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155
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156 if (sslerr == SSL_ERROR_WANT_READ) {
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4
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157 c->read->ready = 0;
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0
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158 return NGX_AGAIN;
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159 }
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160
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161 if (sslerr == SSL_ERROR_WANT_WRITE) {
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162 ngx_log_error(NGX_LOG_ALERT, c->log, err,
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163 "SSL wants to write%s", handshake);
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22
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164
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165 c->write->ready = 0;
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166
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167 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
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168 return NGX_ERROR;
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169 }
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170
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171 /*
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172 * we do not set the timer because there is already the read event timer
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173 */
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174
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175 if (c->ssl->saved_write_handler == NULL) {
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176 c->ssl->saved_write_handler = c->write->event_handler;
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177 c->write->event_handler = ngx_ssl_write_handler;
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178 }
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179
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0
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180 return NGX_AGAIN;
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181 }
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182
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183 c->ssl->no_rcv_shut = 1;
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22
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184 c->ssl->no_send_shut = 1;
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0
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185
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186 if (sslerr == SSL_ERROR_ZERO_RETURN || ERR_peek_error() == 0) {
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187 ngx_log_error(NGX_LOG_INFO, c->log, err,
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188 "client closed connection%s", handshake);
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189
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190 return NGX_ERROR;
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191 }
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192
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193 ngx_ssl_error(NGX_LOG_ALERT, c->log, err,
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194 "SSL_read() failed%s", handshake);
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195
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196 return NGX_ERROR;
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197 }
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198
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199
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22
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200 static void ngx_ssl_write_handler(ngx_event_t *wev)
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201 {
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202 ngx_connection_t *c;
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203
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204 c = wev->data;
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205 c->read->event_handler(c->read);
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206 }
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207
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208
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0
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209 /*
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210 * OpenSSL has no SSL_writev() so we copy several bufs into our 16K buffer
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22
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211 * before the SSL_write() call to decrease a SSL overhead.
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0
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212 *
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213 * Besides for protocols such as HTTP it is possible to always buffer
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214 * the output to decrease a SSL overhead some more.
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215 */
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216
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217 ngx_chain_t *ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in,
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218 off_t limit)
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219 {
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220 int n;
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221 ngx_uint_t flush;
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222 ssize_t send, size;
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223 ngx_buf_t *buf;
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224
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225 buf = c->ssl->buf;
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226
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227 if (in && in->next == NULL && !c->buffered && !c->ssl->buffer) {
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228
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229 /*
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230 * we avoid a buffer copy if the incoming buf is a single,
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231 * our buffer is empty, and we do not need to buffer the output
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232 */
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233
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234 n = ngx_ssl_write(c, in->buf->pos, in->buf->last - in->buf->pos);
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235
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236 if (n == NGX_ERROR) {
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237 return NGX_CHAIN_ERROR;
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238 }
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239
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240 if (n < 0) {
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241 n = 0;
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242 }
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243
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244 in->buf->pos += n;
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245
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246 return in;
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247 }
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248
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22
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249
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250 /* the maximum limit size is the maximum uint32_t value - the page size */
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251
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252 if (limit == 0 || limit > NGX_MAX_UINT32_VALUE - ngx_pagesize) {
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253 limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
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254 }
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255
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256
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0
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257 send = 0;
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258 flush = (in == NULL) ? 1 : 0;
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259
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260 for ( ;; ) {
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261
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262 while (in && buf->last < buf->end) {
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263 if (in->buf->last_buf) {
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264 flush = 1;
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265 }
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266
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267 if (ngx_buf_special(in->buf)) {
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268 in = in->next;
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269 continue;
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270 }
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271
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272 size = in->buf->last - in->buf->pos;
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273
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274 if (size > buf->end - buf->last) {
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275 size = buf->end - buf->last;
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276 }
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277
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278 /*
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279 * TODO: the taking in->buf->flush into account can be
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280 * implemented using the limit on the higher level
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281 */
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282
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283 if (send + size > limit) {
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284 size = limit - send;
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285 flush = 1;
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286 }
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287
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288 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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289 "SSL buf copy: %d", size);
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290
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291 ngx_memcpy(buf->last, in->buf->pos, size);
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292
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293 buf->last += size;
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294
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295 in->buf->pos += size;
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296 if (in->buf->pos == in->buf->last) {
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297 in = in->next;
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298 }
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299 }
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300
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301 size = buf->last - buf->pos;
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302
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303 if (!flush && buf->last < buf->end && c->ssl->buffer) {
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304 break;
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305 }
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306
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307 n = ngx_ssl_write(c, buf->pos, size);
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308
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309 if (n == NGX_ERROR) {
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310 return NGX_CHAIN_ERROR;
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311 }
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312
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313 if (n < 0) {
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314 n = 0;
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315 }
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316
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317 buf->pos += n;
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318 send += n;
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319 c->sent += n;
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320
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321 if (n < size) {
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322 break;
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323 }
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324
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325 if (buf->pos == buf->last) {
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326 buf->pos = buf->start;
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327 buf->last = buf->start;
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328 }
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329
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330 if (in == NULL || send == limit) {
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331 break;
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332 }
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333 }
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334
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335 c->buffered = (buf->pos < buf->last) ? 1 : 0;
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336
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337 return in;
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338 }
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339
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340
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18
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341 static ssize_t ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size)
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0
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342 {
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2
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343 int n, sslerr;
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344 ngx_err_t err;
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345 char *handshake;
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0
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346
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347 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL to write: %d", size);
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348
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349 n = SSL_write(c->ssl->ssl, data, size);
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350
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351 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_write: %d", n);
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352
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353 if (n > 0) {
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22
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354 if (c->ssl->saved_read_handler) {
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355
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356 c->read->event_handler = c->ssl->saved_read_handler;
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357 c->ssl->saved_read_handler = NULL;
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358 c->read->ready = 1;
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359
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360 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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361 return NGX_ERROR;
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362 }
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363
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364 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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365 return NGX_ERROR;
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366 }
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367
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368 ngx_post_event(c->read);
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369
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370 ngx_mutex_unlock(ngx_posted_events_mutex);
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371 }
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372
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0
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373 return n;
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374 }
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375
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376 sslerr = SSL_get_error(c->ssl->ssl, n);
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377
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378 err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
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379
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380 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
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381
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382 if (sslerr == SSL_ERROR_WANT_WRITE) {
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383 c->write->ready = 0;
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384 return NGX_AGAIN;
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385 }
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386
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387 if (sslerr == SSL_ERROR_WANT_READ) {
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2
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388
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389 if (!SSL_is_init_finished(c->ssl->ssl)) {
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10
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390 handshake = " in SSL handshake";
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2
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391
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392 } else {
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393 handshake = "";
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394 }
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395
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0
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396 ngx_log_error(NGX_LOG_ALERT, c->log, err,
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397 "SSL wants to read%s", handshake);
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22
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398
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399 c->read->ready = 0;
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400
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401 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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402 return NGX_ERROR;
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403 }
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404
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405 /*
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406 * we do not set the timer because there is already
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407 * the write event timer
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408 */
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409
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410 if (c->ssl->saved_read_handler == NULL) {
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411 c->ssl->saved_read_handler = c->read->event_handler;
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412 c->read->event_handler = ngx_ssl_read_handler;
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413 }
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414
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0
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415 return NGX_AGAIN;
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416 }
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417
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418 c->ssl->no_rcv_shut = 1;
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22
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419 c->ssl->no_send_shut = 1;
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0
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420
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421 ngx_ssl_error(NGX_LOG_ALERT, c->log, err, "SSL_write() failed");
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422
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423 return NGX_ERROR;
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424 }
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425
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426
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22
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427 static void ngx_ssl_read_handler(ngx_event_t *rev)
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428 {
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429 ngx_connection_t *c;
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430
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431 c = rev->data;
|
|
|
432 c->write->event_handler(c->write);
|
|
|
433 }
|
|
|
434
|
|
|
435
|
|
0
|
436 ngx_int_t ngx_ssl_shutdown(ngx_connection_t *c)
|
|
|
437 {
|
|
22
|
438 int n, sslerr, mode;
|
|
0
|
439 ngx_uint_t again;
|
|
|
440
|
|
22
|
441 if (!c->ssl->shutdown_set) {
|
|
|
442
|
|
|
443 /* it seems that SSL_set_shutdown() could be called once only */
|
|
|
444
|
|
|
445 if (c->read->timedout) {
|
|
|
446 mode = SSL_RECEIVED_SHUTDOWN|SSL_SENT_SHUTDOWN;
|
|
0
|
447
|
|
22
|
448 } else {
|
|
|
449 mode = 0;
|
|
|
450
|
|
|
451 if (c->ssl->no_rcv_shut) {
|
|
|
452 mode = SSL_RECEIVED_SHUTDOWN;
|
|
|
453 }
|
|
|
454
|
|
|
455 if (c->ssl->no_send_shut) {
|
|
|
456 mode |= SSL_SENT_SHUTDOWN;
|
|
|
457 }
|
|
0
|
458 }
|
|
|
459
|
|
22
|
460 if (mode) {
|
|
|
461 SSL_set_shutdown(c->ssl->ssl, mode);
|
|
|
462 c->ssl->shutdown_set = 1;
|
|
0
|
463 }
|
|
|
464 }
|
|
|
465
|
|
|
466 again = 0;
|
|
10
|
467 #if (NGX_SUPPRESS_WARN)
|
|
|
468 sslerr = 0;
|
|
|
469 #endif
|
|
0
|
470
|
|
|
471 for ( ;; ) {
|
|
|
472 n = SSL_shutdown(c->ssl->ssl);
|
|
|
473
|
|
|
474 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_shutdown: %d", n);
|
|
|
475
|
|
22
|
476 if (n == 1 || (n == 0 && c->read->timedout)) {
|
|
|
477 SSL_free(c->ssl->ssl);
|
|
|
478 c->ssl = NULL;
|
|
|
479 return NGX_OK;
|
|
|
480 }
|
|
|
481
|
|
0
|
482 if (n == 0) {
|
|
|
483 again = 1;
|
|
|
484 break;
|
|
|
485 }
|
|
|
486
|
|
|
487 break;
|
|
|
488 }
|
|
|
489
|
|
|
490 if (!again) {
|
|
|
491 sslerr = SSL_get_error(c->ssl->ssl, n);
|
|
|
492
|
|
|
493 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
494 "SSL_get_error: %d", sslerr);
|
|
|
495 }
|
|
|
496
|
|
|
497 if (again || sslerr == SSL_ERROR_WANT_READ) {
|
|
|
498
|
|
22
|
499 ngx_add_timer(c->read, 30000);
|
|
0
|
500
|
|
|
501 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
|
|
502 return NGX_ERROR;
|
|
|
503 }
|
|
|
504
|
|
|
505 return NGX_AGAIN;
|
|
|
506 }
|
|
|
507
|
|
|
508 if (sslerr == SSL_ERROR_WANT_WRITE) {
|
|
|
509
|
|
|
510 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
|
|
|
511 return NGX_ERROR;
|
|
|
512 }
|
|
|
513
|
|
|
514 return NGX_AGAIN;
|
|
|
515 }
|
|
|
516
|
|
|
517 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_shutdown() failed");
|
|
|
518
|
|
|
519 return NGX_ERROR;
|
|
|
520 }
|
|
|
521
|
|
|
522
|
|
|
523 void ngx_ssl_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
|
|
|
524 char *fmt, ...)
|
|
|
525 {
|
|
10
|
526 u_char errstr[NGX_MAX_CONF_ERRSTR], *p, *last;
|
|
|
527 va_list args;
|
|
|
528
|
|
|
529 last = errstr + NGX_MAX_CONF_ERRSTR;
|
|
0
|
530
|
|
|
531 va_start(args, fmt);
|
|
10
|
532 p = ngx_vsnprintf(errstr, sizeof(errstr) - 1, fmt, args);
|
|
0
|
533 va_end(args);
|
|
|
534
|
|
10
|
535 p = ngx_cpystrn(p, " (SSL: ", last - p);
|
|
0
|
536
|
|
10
|
537 ERR_error_string_n(ERR_get_error(), (char *) p, last - p);
|
|
0
|
538
|
|
|
539 ngx_log_error(level, log, err, "%s)", errstr);
|
|
|
540 }
|
