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