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0
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1
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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5
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9 #include <ngx_event.h>
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10
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28
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11 #include <openssl/engine.h>
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12
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0
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13
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38
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14 static ngx_int_t ngx_ssl_handle_recv(ngx_connection_t *c, int n);
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22
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15 static void ngx_ssl_write_handler(ngx_event_t *wev);
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16 static void ngx_ssl_read_handler(ngx_event_t *rev);
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0
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17
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18
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38
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19 ngx_int_t
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20 ngx_ssl_init(ngx_log_t *log)
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0
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21 {
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22 SSL_library_init();
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23 SSL_load_error_strings();
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28
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24 ENGINE_load_builtin_engines();
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0
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25
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26 return NGX_OK;
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27 }
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28
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29
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38
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30 ngx_int_t
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31 ngx_ssl_create_session(ngx_ssl_ctx_t *ssl_ctx, ngx_connection_t *c,
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32 ngx_uint_t flags)
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0
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33 {
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34 ngx_ssl_t *ssl;
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35
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50
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36 ssl = ngx_pcalloc(c->pool, sizeof(ngx_ssl_t));
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37 if (ssl == NULL) {
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0
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38 return NGX_ERROR;
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39 }
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40
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50
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41 ssl->buf = ngx_create_temp_buf(c->pool, NGX_SSL_BUFSIZE);
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42 if (ssl->buf == NULL) {
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0
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43 return NGX_ERROR;
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44 }
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45
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46 if (flags & NGX_SSL_BUFFER) {
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47 ssl->buffer = 1;
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48 }
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49
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50 ssl->ssl = SSL_new(ssl_ctx);
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51
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52 if (ssl->ssl == NULL) {
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53 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_new() failed");
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54 return NGX_ERROR;
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55 }
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56
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57 if (SSL_set_fd(ssl->ssl, c->fd) == 0) {
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58 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_set_fd() failed");
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59 return NGX_ERROR;
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60 }
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61
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62 SSL_set_accept_state(ssl->ssl);
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63
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64 c->ssl = ssl;
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65
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66 return NGX_OK;
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67 }
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68
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69
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38
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70 ssize_t
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71 ngx_ssl_recv(ngx_connection_t *c, u_char *buf, size_t size)
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0
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72 {
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38
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73 int n, bytes;
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74
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75 if (c->ssl->last == NGX_ERROR) {
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76 return NGX_ERROR;
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77 }
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78
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79 bytes = 0;
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0
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80
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38
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81 /*
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82 * SSL_read() may return data in parts, so try to read
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83 * until SSL_read() would return no data
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84 */
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85
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86 for ( ;; ) {
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0
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87
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38
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88 n = SSL_read(c->ssl->ssl, buf, size);
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89
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90 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_read: %d", n);
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0
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91
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38
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92 if (n > 0) {
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93
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94 bytes += n;
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28
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95
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96 #if (NGX_DEBUG)
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97
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38
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98 if (!c->ssl->handshaked && SSL_is_init_finished(c->ssl->ssl)) {
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99 char buf[129], *s, *d;
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100 SSL_CIPHER *cipher;
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28
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101
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38
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102 c->ssl->handshaked = 1;
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103
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104 cipher = SSL_get_current_cipher(c->ssl->ssl);
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105
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106 if (cipher) {
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107 SSL_CIPHER_description(cipher, &buf[1], 128);
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28
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108
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38
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109 for (s = &buf[1], d = buf; *s; s++) {
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110 if (*s == ' ' && *d == ' ') {
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111 continue;
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112 }
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28
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113
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40
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114 if (*s == LF || *s == CR) {
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38
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115 continue;
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116 }
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28
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117
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38
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118 *++d = *s;
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28
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119 }
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120
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38
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121 if (*d != ' ') {
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122 d++;
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28
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123 }
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124
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38
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125 *d = '\0';
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28
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126
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38
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127 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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128 "SSL cipher: \"%s\"", &buf[1]);
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129 } else {
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130 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
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131 "SSL no shared ciphers");
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28
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132 }
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38
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133 }
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134 #endif
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28
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135
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38
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136 }
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137
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138 c->ssl->last = ngx_ssl_handle_recv(c, n);
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139
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140 if (c->ssl->last != NGX_OK) {
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28
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141
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38
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142 if (bytes) {
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143 return bytes;
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144
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28
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145 } else {
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38
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146 return c->ssl->last;
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28
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147 }
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148 }
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149
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38
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150 size -= n;
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151
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152 if (size == 0) {
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153 return bytes;
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154 }
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155
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156 buf += n;
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157 }
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158 }
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159
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160
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161 static ngx_int_t
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162 ngx_ssl_handle_recv(ngx_connection_t *c, int n)
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163 {
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164 int sslerr;
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165 ngx_err_t err;
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166 char *handshake;
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167
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168 if (n > 0) {
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28
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169
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22
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170 if (c->ssl->saved_write_handler) {
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171
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58
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172 c->write->handler = c->ssl->saved_write_handler;
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22
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173 c->ssl->saved_write_handler = NULL;
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174 c->write->ready = 1;
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175
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176 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
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177 return NGX_ERROR;
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178 }
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179
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180 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
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181 return NGX_ERROR;
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182 }
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183
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184 ngx_post_event(c->write);
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185
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186 ngx_mutex_unlock(ngx_posted_events_mutex);
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187 }
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188
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38
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189 return NGX_OK;
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0
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190 }
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191
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2
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192 if (!SSL_is_init_finished(c->ssl->ssl)) {
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10
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193 handshake = " in SSL handshake";
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2
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194
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195 } else {
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196 handshake = "";
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197 }
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198
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0
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199 sslerr = SSL_get_error(c->ssl->ssl, n);
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200
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201 err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
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202
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203 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
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204
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205 if (sslerr == SSL_ERROR_WANT_READ) {
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4
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206 c->read->ready = 0;
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0
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207 return NGX_AGAIN;
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208 }
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209
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210 if (sslerr == SSL_ERROR_WANT_WRITE) {
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88
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211
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212 ngx_log_error(NGX_LOG_INFO, c->log, err,
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213 "client does SSL %shandshake",
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214 SSL_is_init_finished(c->ssl->ssl) ? "re" : "");
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22
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215
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216 c->write->ready = 0;
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217
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218 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
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219 return NGX_ERROR;
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220 }
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221
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222 /*
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223 * we do not set the timer because there is already the read event timer
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224 */
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225
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226 if (c->ssl->saved_write_handler == NULL) {
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58
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227 c->ssl->saved_write_handler = c->write->handler;
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228 c->write->handler = ngx_ssl_write_handler;
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22
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229 }
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230
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0
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231 return NGX_AGAIN;
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232 }
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233
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234 c->ssl->no_rcv_shut = 1;
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22
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235 c->ssl->no_send_shut = 1;
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0
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236
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237 if (sslerr == SSL_ERROR_ZERO_RETURN || ERR_peek_error() == 0) {
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238 ngx_log_error(NGX_LOG_INFO, c->log, err,
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239 "client closed connection%s", handshake);
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240
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241 return NGX_ERROR;
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242 }
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243
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244 ngx_ssl_error(NGX_LOG_ALERT, c->log, err,
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245 "SSL_read() failed%s", handshake);
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246
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247 return NGX_ERROR;
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248 }
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249
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250
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38
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251 static void
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252 ngx_ssl_write_handler(ngx_event_t *wev)
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22
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253 {
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254 ngx_connection_t *c;
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255
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256 c = wev->data;
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58
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257 c->read->handler(c->read);
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22
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258 }
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259
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260
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0
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261 /*
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262 * OpenSSL has no SSL_writev() so we copy several bufs into our 16K buffer
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22
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263 * before the SSL_write() call to decrease a SSL overhead.
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0
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264 *
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265 * Besides for protocols such as HTTP it is possible to always buffer
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266 * the output to decrease a SSL overhead some more.
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267 */
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268
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38
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269 ngx_chain_t *
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270 ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in, off_t limit)
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0
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271 {
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272 int n;
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273 ngx_uint_t flush;
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274 ssize_t send, size;
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275 ngx_buf_t *buf;
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276
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277 buf = c->ssl->buf;
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278
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279 if (in && in->next == NULL && !c->buffered && !c->ssl->buffer) {
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280
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281 /*
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282 * we avoid a buffer copy if the incoming buf is a single,
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283 * our buffer is empty, and we do not need to buffer the output
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284 */
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285
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286 n = ngx_ssl_write(c, in->buf->pos, in->buf->last - in->buf->pos);
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287
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288 if (n == NGX_ERROR) {
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289 return NGX_CHAIN_ERROR;
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290 }
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291
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62
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292 if (n == NGX_AGAIN) {
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293 c->buffered = 1;
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294 return in;
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0
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295 }
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296
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297 in->buf->pos += n;
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298
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299 return in;
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300 }
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301
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22
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302
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303 /* the maximum limit size is the maximum uint32_t value - the page size */
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304
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305 if (limit == 0 || limit > NGX_MAX_UINT32_VALUE - ngx_pagesize) {
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306 limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
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307 }
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308
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309
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0
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310 send = 0;
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311 flush = (in == NULL) ? 1 : 0;
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312
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313 for ( ;; ) {
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314
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315 while (in && buf->last < buf->end) {
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316 if (in->buf->last_buf) {
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317 flush = 1;
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318 }
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319
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320 if (ngx_buf_special(in->buf)) {
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321 in = in->next;
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322 continue;
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323 }
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324
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325 size = in->buf->last - in->buf->pos;
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326
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327 if (size > buf->end - buf->last) {
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328 size = buf->end - buf->last;
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329 }
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330
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331 /*
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332 * TODO: the taking in->buf->flush into account can be
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333 * implemented using the limit on the higher level
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334 */
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335
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336 if (send + size > limit) {
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337 size = limit - send;
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338 flush = 1;
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339 }
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340
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341 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
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342 "SSL buf copy: %d", size);
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343
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344 ngx_memcpy(buf->last, in->buf->pos, size);
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345
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346 buf->last += size;
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347
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348 in->buf->pos += size;
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349 if (in->buf->pos == in->buf->last) {
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350 in = in->next;
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351 }
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352 }
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353
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354 size = buf->last - buf->pos;
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355
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356 if (!flush && buf->last < buf->end && c->ssl->buffer) {
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357 break;
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358 }
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359
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360 n = ngx_ssl_write(c, buf->pos, size);
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361
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362 if (n == NGX_ERROR) {
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363 return NGX_CHAIN_ERROR;
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364 }
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365
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60
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366 if (n == NGX_AGAIN) {
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367 c->buffered = 1;
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368 return in;
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0
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369 }
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370
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371 buf->pos += n;
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372 send += n;
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373 c->sent += n;
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374
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375 if (n < size) {
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376 break;
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377 }
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378
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379 if (buf->pos == buf->last) {
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380 buf->pos = buf->start;
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381 buf->last = buf->start;
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382 }
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383
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384 if (in == NULL || send == limit) {
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385 break;
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386 }
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387 }
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388
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389 c->buffered = (buf->pos < buf->last) ? 1 : 0;
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390
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391 return in;
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392 }
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393
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394
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88
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395 ssize_t
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38
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396 ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size)
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0
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397 {
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88
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398 int n, sslerr;
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399 ngx_err_t err;
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0
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400
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401 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL to write: %d", size);
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402
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403 n = SSL_write(c->ssl->ssl, data, size);
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404
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405 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_write: %d", n);
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406
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407 if (n > 0) {
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88
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408
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409 #if (NGX_DEBUG)
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410
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411 if (!c->ssl->handshaked && SSL_is_init_finished(c->ssl->ssl)) {
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412 char buf[129], *s, *d;
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413 SSL_CIPHER *cipher;
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414
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415 c->ssl->handshaked = 1;
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416
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417 cipher = SSL_get_current_cipher(c->ssl->ssl);
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418
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419 if (cipher) {
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420 SSL_CIPHER_description(cipher, &buf[1], 128);
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421
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422 for (s = &buf[1], d = buf; *s; s++) {
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423 if (*s == ' ' && *d == ' ') {
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424 continue;
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425 }
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426
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427 if (*s == LF || *s == CR) {
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428 continue;
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429 }
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430
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431 *++d = *s;
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432 }
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433
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434 if (*d != ' ') {
|
|
|
435 d++;
|
|
|
436 }
|
|
|
437
|
|
|
438 *d = '\0';
|
|
|
439
|
|
|
440 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
441 "SSL cipher: \"%s\"", &buf[1]);
|
|
|
442 } else {
|
|
|
443 ngx_log_debug0(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
444 "SSL no shared ciphers");
|
|
|
445 }
|
|
|
446 }
|
|
|
447 #endif
|
|
|
448
|
|
22
|
449 if (c->ssl->saved_read_handler) {
|
|
|
450
|
|
58
|
451 c->read->handler = c->ssl->saved_read_handler;
|
|
22
|
452 c->ssl->saved_read_handler = NULL;
|
|
|
453 c->read->ready = 1;
|
|
|
454
|
|
|
455 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
|
|
456 return NGX_ERROR;
|
|
|
457 }
|
|
|
458
|
|
|
459 if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
|
|
|
460 return NGX_ERROR;
|
|
|
461 }
|
|
|
462
|
|
|
463 ngx_post_event(c->read);
|
|
|
464
|
|
|
465 ngx_mutex_unlock(ngx_posted_events_mutex);
|
|
|
466 }
|
|
|
467
|
|
0
|
468 return n;
|
|
|
469 }
|
|
|
470
|
|
|
471 sslerr = SSL_get_error(c->ssl->ssl, n);
|
|
|
472
|
|
|
473 err = (sslerr == SSL_ERROR_SYSCALL) ? ngx_errno : 0;
|
|
|
474
|
|
|
475 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_get_error: %d", sslerr);
|
|
|
476
|
|
|
477 if (sslerr == SSL_ERROR_WANT_WRITE) {
|
|
|
478 c->write->ready = 0;
|
|
|
479 return NGX_AGAIN;
|
|
|
480 }
|
|
|
481
|
|
|
482 if (sslerr == SSL_ERROR_WANT_READ) {
|
|
2
|
483
|
|
88
|
484 ngx_log_error(NGX_LOG_INFO, c->log, err,
|
|
|
485 "client does SSL %shandshake",
|
|
|
486 SSL_is_init_finished(c->ssl->ssl) ? "re" : "");
|
|
22
|
487
|
|
|
488 c->read->ready = 0;
|
|
|
489
|
|
|
490 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
|
|
491 return NGX_ERROR;
|
|
|
492 }
|
|
|
493
|
|
|
494 /*
|
|
|
495 * we do not set the timer because there is already
|
|
|
496 * the write event timer
|
|
|
497 */
|
|
|
498
|
|
|
499 if (c->ssl->saved_read_handler == NULL) {
|
|
58
|
500 c->ssl->saved_read_handler = c->read->handler;
|
|
|
501 c->read->handler = ngx_ssl_read_handler;
|
|
22
|
502 }
|
|
|
503
|
|
0
|
504 return NGX_AGAIN;
|
|
|
505 }
|
|
|
506
|
|
|
507 c->ssl->no_rcv_shut = 1;
|
|
22
|
508 c->ssl->no_send_shut = 1;
|
|
0
|
509
|
|
|
510 ngx_ssl_error(NGX_LOG_ALERT, c->log, err, "SSL_write() failed");
|
|
|
511
|
|
|
512 return NGX_ERROR;
|
|
|
513 }
|
|
|
514
|
|
|
515
|
|
38
|
516 static void
|
|
|
517 ngx_ssl_read_handler(ngx_event_t *rev)
|
|
22
|
518 {
|
|
|
519 ngx_connection_t *c;
|
|
|
520
|
|
|
521 c = rev->data;
|
|
58
|
522 c->write->handler(c->write);
|
|
22
|
523 }
|
|
|
524
|
|
|
525
|
|
38
|
526 ngx_int_t
|
|
|
527 ngx_ssl_shutdown(ngx_connection_t *c)
|
|
0
|
528 {
|
|
22
|
529 int n, sslerr, mode;
|
|
0
|
530 ngx_uint_t again;
|
|
|
531
|
|
22
|
532 if (!c->ssl->shutdown_set) {
|
|
|
533
|
|
|
534 /* it seems that SSL_set_shutdown() could be called once only */
|
|
|
535
|
|
|
536 if (c->read->timedout) {
|
|
|
537 mode = SSL_RECEIVED_SHUTDOWN|SSL_SENT_SHUTDOWN;
|
|
0
|
538
|
|
22
|
539 } else {
|
|
|
540 mode = 0;
|
|
|
541
|
|
|
542 if (c->ssl->no_rcv_shut) {
|
|
|
543 mode = SSL_RECEIVED_SHUTDOWN;
|
|
|
544 }
|
|
|
545
|
|
|
546 if (c->ssl->no_send_shut) {
|
|
|
547 mode |= SSL_SENT_SHUTDOWN;
|
|
|
548 }
|
|
0
|
549 }
|
|
|
550
|
|
22
|
551 if (mode) {
|
|
|
552 SSL_set_shutdown(c->ssl->ssl, mode);
|
|
|
553 c->ssl->shutdown_set = 1;
|
|
0
|
554 }
|
|
|
555 }
|
|
|
556
|
|
|
557 again = 0;
|
|
10
|
558 #if (NGX_SUPPRESS_WARN)
|
|
|
559 sslerr = 0;
|
|
|
560 #endif
|
|
0
|
561
|
|
|
562 for ( ;; ) {
|
|
|
563 n = SSL_shutdown(c->ssl->ssl);
|
|
|
564
|
|
|
565 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0, "SSL_shutdown: %d", n);
|
|
|
566
|
|
22
|
567 if (n == 1 || (n == 0 && c->read->timedout)) {
|
|
|
568 SSL_free(c->ssl->ssl);
|
|
|
569 c->ssl = NULL;
|
|
|
570 return NGX_OK;
|
|
|
571 }
|
|
|
572
|
|
0
|
573 if (n == 0) {
|
|
|
574 again = 1;
|
|
|
575 break;
|
|
|
576 }
|
|
|
577
|
|
|
578 break;
|
|
|
579 }
|
|
|
580
|
|
|
581 if (!again) {
|
|
|
582 sslerr = SSL_get_error(c->ssl->ssl, n);
|
|
|
583
|
|
|
584 ngx_log_debug1(NGX_LOG_DEBUG_EVENT, c->log, 0,
|
|
|
585 "SSL_get_error: %d", sslerr);
|
|
|
586 }
|
|
|
587
|
|
|
588 if (again || sslerr == SSL_ERROR_WANT_READ) {
|
|
|
589
|
|
22
|
590 ngx_add_timer(c->read, 30000);
|
|
0
|
591
|
|
|
592 if (ngx_handle_read_event(c->read, 0) == NGX_ERROR) {
|
|
|
593 return NGX_ERROR;
|
|
|
594 }
|
|
|
595
|
|
|
596 return NGX_AGAIN;
|
|
|
597 }
|
|
|
598
|
|
|
599 if (sslerr == SSL_ERROR_WANT_WRITE) {
|
|
|
600
|
|
|
601 if (ngx_handle_write_event(c->write, 0) == NGX_ERROR) {
|
|
|
602 return NGX_ERROR;
|
|
|
603 }
|
|
|
604
|
|
|
605 return NGX_AGAIN;
|
|
|
606 }
|
|
|
607
|
|
|
608 ngx_ssl_error(NGX_LOG_ALERT, c->log, 0, "SSL_shutdown() failed");
|
|
|
609
|
|
|
610 return NGX_ERROR;
|
|
|
611 }
|
|
|
612
|
|
|
613
|
|
38
|
614 void
|
|
|
615 ngx_ssl_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err, char *fmt, ...)
|
|
0
|
616 {
|
|
10
|
617 u_char errstr[NGX_MAX_CONF_ERRSTR], *p, *last;
|
|
|
618 va_list args;
|
|
|
619
|
|
|
620 last = errstr + NGX_MAX_CONF_ERRSTR;
|
|
0
|
621
|
|
|
622 va_start(args, fmt);
|
|
10
|
623 p = ngx_vsnprintf(errstr, sizeof(errstr) - 1, fmt, args);
|
|
0
|
624 va_end(args);
|
|
|
625
|
|
50
|
626 p = ngx_cpystrn(p, (u_char *) " (SSL: ", last - p);
|
|
0
|
627
|
|
10
|
628 ERR_error_string_n(ERR_get_error(), (char *) p, last - p);
|
|
0
|
629
|
|
|
630 ngx_log_error(level, log, err, "%s)", errstr);
|
|
|
631 }
|
|
58
|
632
|
|
|
633
|
|
|
634 void
|
|
|
635 ngx_ssl_cleanup_ctx(void *data)
|
|
|
636 {
|
|
|
637 SSL_CTX *ctx = data;
|
|
|
638
|
|
|
639 SSL_CTX_free(ctx);
|
|
|
640 }
|
