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