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