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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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12 static ngx_int_t ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size);
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13
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14
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15 ngx_int_t ngx_ssl_init(ngx_log_t *log)
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16 {
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17 SSL_library_init();
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18 SSL_load_error_strings();
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19
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20 return NGX_OK;
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21 }
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22
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23
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24 ngx_int_t ngx_ssl_create_session(ngx_ssl_ctx_t *ssl_ctx, ngx_connection_t *c,
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25 ngx_uint_t flags)
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26 {
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27 ngx_ssl_t *ssl;
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28
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29 if (!(ssl = ngx_pcalloc(c->pool, sizeof(ngx_ssl_t)))) {
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30 return NGX_ERROR;
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31 }
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32
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33 if (!(ssl->buf = ngx_create_temp_buf(c->pool, NGX_SSL_BUFSIZE))) {
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34 return NGX_ERROR;
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35 }
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36
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37 if (flags & NGX_SSL_BUFFER) {
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38 ssl->buffer = 1;
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39 }
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40
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41 ssl->ssl = SSL_new(ssl_ctx);
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42
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43 if (ssl->ssl == NULL) {
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44 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_new() failed");
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45 return NGX_ERROR;
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46 }
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47
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48 if (SSL_set_fd(ssl->ssl, c->fd) == 0) {
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49 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_set_fd() failed");
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50 return NGX_ERROR;
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51 }
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52
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53 SSL_set_accept_state(ssl->ssl);
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54
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55 c->ssl = ssl;
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56
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57 return NGX_OK;
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58 }
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59
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60
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61 ngx_int_t ngx_ssl_recv(ngx_connection_t *c, u_char *buf, size_t size)
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62 {
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63 int n, sslerr;
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64 ngx_err_t err;
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65 char *handshake;
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66
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67 n = SSL_read(c->ssl->ssl, buf, size);
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68
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69 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_read: %d", n);
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70
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71 if (n > 0) {
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72 return n;
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73 }
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74
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2
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75 if (!SSL_is_init_finished(c->ssl->ssl)) {
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10
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76 handshake = " in SSL handshake";
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2
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77
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78 } else {
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79 handshake = "";
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80 }
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81
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0
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82 sslerr = SSL_get_error(c->ssl->ssl, n);
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83
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84 err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
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85
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86 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
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87
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88 if (sslerr == SSL_ERROR_WANT_READ) {
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4
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89 c->read->ready = 0;
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0
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90 return NGX_AGAIN;
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91 }
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92
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93 if (sslerr == SSL_ERROR_WANT_WRITE) {
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94 ngx_log_error(NGX_LOG_ALERT, c->log, err,
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95 "SSL wants to write%s", handshake);
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96 return NGX_ERROR;
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97 #if 0
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98 return NGX_AGAIN;
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99 #endif
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100 }
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101
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102 c->ssl->no_rcv_shut = 1;
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103
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104 if (sslerr == SSL_ERROR_ZERO_RETURN || ERR_peek_error() == 0) {
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105 ngx_log_error(NGX_LOG_INFO, c->log, err,
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106 "client closed connection%s", handshake);
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107
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108 return NGX_ERROR;
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109 }
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110
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111 ngx_ssl_error(NGX_LOG_ALERT, c->log, err,
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112 "SSL_read() failed%s", handshake);
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113
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114 return NGX_ERROR;
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115 }
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116
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117
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118 /*
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119 * OpenSSL has no SSL_writev() so we copy several bufs into our 16K buffer
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120 * before SSL_write() call to decrease a SSL overhead.
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121 *
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122 * Besides for protocols such as HTTP it is possible to always buffer
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123 * the output to decrease a SSL overhead some more.
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124 */
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125
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126 ngx_chain_t *ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in,
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127 off_t limit)
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128 {
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129 int n;
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130 ngx_uint_t flush;
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131 ssize_t send, size;
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132 ngx_buf_t *buf;
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133
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134 buf = c->ssl->buf;
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135
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136 if (in && in->next == NULL && !c->buffered && !c->ssl->buffer) {
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137
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138 /*
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139 * we avoid a buffer copy if the incoming buf is a single,
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140 * our buffer is empty, and we do not need to buffer the output
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141 */
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142
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143 n = ngx_ssl_write(c, in->buf->pos, in->buf->last - in->buf->pos);
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144
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145 if (n == NGX_ERROR) {
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146 return NGX_CHAIN_ERROR;
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147 }
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148
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149 if (n < 0) {
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150 n = 0;
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151 }
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152
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153 in->buf->pos += n;
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154
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155 return in;
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156 }
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157
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158 send = 0;
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159 flush = (in == NULL) ? 1 : 0;
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160
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161 for ( ;; ) {
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162
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163 while (in && buf->last < buf->end) {
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164 if (in->buf->last_buf) {
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165 flush = 1;
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166 }
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167
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168 if (ngx_buf_special(in->buf)) {
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169 in = in->next;
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170 continue;
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171 }
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172
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173 size = in->buf->last - in->buf->pos;
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174
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175 if (size > buf->end - buf->last) {
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176 size = buf->end - buf->last;
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177 }
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178
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179 /*
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180 * TODO: the taking in->buf->flush into account can be
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181 * implemented using the limit on the higher level
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182 */
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183
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184 if (send + size > limit) {
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185 size = limit - send;
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186 flush = 1;
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187 }
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188
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189 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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190 "SSL buf copy: %d", size);
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191
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192 ngx_memcpy(buf->last, in->buf->pos, size);
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193
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194 buf->last += size;
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195
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196 in->buf->pos += size;
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197 if (in->buf->pos == in->buf->last) {
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198 in = in->next;
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199 }
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200 }
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201
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202 size = buf->last - buf->pos;
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203
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204 if (!flush && buf->last < buf->end && c->ssl->buffer) {
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205 break;
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206 }
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207
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208 n = ngx_ssl_write(c, buf->pos, size);
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209
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210 if (n == NGX_ERROR) {
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211 return NGX_CHAIN_ERROR;
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212 }
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213
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214 if (n < 0) {
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215 n = 0;
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216 }
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217
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218 buf->pos += n;
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219 send += n;
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220 c->sent += n;
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221
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222 if (n < size) {
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223 break;
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224 }
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225
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226 if (buf->pos == buf->last) {
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227 buf->pos = buf->start;
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228 buf->last = buf->start;
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229 }
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230
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231 if (in == NULL || send == limit) {
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232 break;
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233 }
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234 }
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235
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236 c->buffered = (buf->pos < buf->last) ? 1 : 0;
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237
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238 return in;
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239 }
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240
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241
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242 static ngx_int_t ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size)
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243 {
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2
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244 int n, sslerr;
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245 ngx_err_t err;
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246 char *handshake;
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0
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247
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248 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL to write: %d", size);
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249
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250 n = SSL_write(c->ssl->ssl, data, size);
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251
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252 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_write: %d", n);
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253
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254 if (n > 0) {
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255 return n;
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256 }
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257
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258 sslerr = SSL_get_error(c->ssl->ssl, n);
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259
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260 err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
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261
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262 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
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263
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264 if (sslerr == SSL_ERROR_WANT_WRITE) {
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265 c->write->ready = 0;
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266 return NGX_AGAIN;
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267 }
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268
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269 if (sslerr == SSL_ERROR_WANT_READ) {
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2
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270
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271 if (!SSL_is_init_finished(c->ssl->ssl)) {
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10
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272 handshake = " in SSL handshake";
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2
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273
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274 } else {
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275 handshake = "";
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276 }
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277
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0
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278 ngx_log_error(NGX_LOG_ALERT, c->log, err,
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279 "SSL wants to read%s", handshake);
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280 return NGX_ERROR;
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281 #if 0
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282 return NGX_AGAIN;
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2
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283 #endif
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0
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284 }
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285
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286 c->ssl->no_rcv_shut = 1;
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287
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288 ngx_ssl_error(NGX_LOG_ALERT, c->log, err, "SSL_write() failed");
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289
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290 return NGX_ERROR;
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291 }
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292
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293
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294 ngx_int_t ngx_ssl_shutdown(ngx_connection_t *c)
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295 {
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296 int n, sslerr;
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297 ngx_uint_t again;
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298
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299 if (c->timedout) {
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300 SSL_set_shutdown(c->ssl->ssl, SSL_RECEIVED_SHUTDOWN|SSL_SENT_SHUTDOWN);
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301
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302 } else {
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303 if (c->ssl->no_rcv_shut) {
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304 SSL_set_shutdown(c->ssl->ssl, SSL_RECEIVED_SHUTDOWN);
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305 }
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306
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307 if (c->ssl->no_send_shut) {
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308 SSL_set_shutdown(c->ssl->ssl, SSL_SENT_SHUTDOWN);
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309 }
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310 }
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311
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312 again = 0;
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10
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313 #if (NGX_SUPPRESS_WARN)
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314 sslerr = 0;
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315 #endif
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0
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316
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317 for ( ;; ) {
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318 n = SSL_shutdown(c->ssl->ssl);
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319
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320 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_shutdown: %d", n);
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321
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322 if (n == 0) {
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323 again = 1;
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324 break;
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325 }
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326
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327 if (n == 1) {
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328 SSL_free(c->ssl->ssl);
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329 c->ssl = NULL;
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330 return NGX_OK;
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331 }
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332
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333 break;
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334 }
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335
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336 if (!again) {
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337 sslerr = SSL_get_error(c->ssl->ssl, n);
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338
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339 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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340 "SSL_get_error: %d", sslerr);
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341 }
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342
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343 if (again || sslerr == SSL_ERROR_WANT_READ) {
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344
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345 ngx_add_timer(c->read, 10000);
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346
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347 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
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348 return NGX_ERROR;
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349 }
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350
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351 return NGX_AGAIN;
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352 }
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353
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354 if (sslerr == SSL_ERROR_WANT_WRITE) {
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355
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356 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
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357 return NGX_ERROR;
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358 }
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359
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360 return NGX_AGAIN;
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361 }
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362
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363 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_shutdown() failed");
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364
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365 return NGX_ERROR;
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366 }
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367
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368
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369 void ngx_ssl_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
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370 char *fmt, ...)
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371 {
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10
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372 u_char errstr[NGX_MAX_CONF_ERRSTR], *p, *last;
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373 va_list args;
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374
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375 last = errstr + NGX_MAX_CONF_ERRSTR;
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0
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376
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377 va_start(args, fmt);
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10
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378 p = ngx_vsnprintf(errstr, sizeof(errstr) - 1, fmt, args);
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0
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379 va_end(args);
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380
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10
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381 p = ngx_cpystrn(p, " (SSL: ", last - p);
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0
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382
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10
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383 ERR_error_string_n(ERR_get_error(), (char *) p, last - p);
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0
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384
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385 ngx_log_error(level, log, err, "%s)", errstr);
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386 }
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