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174
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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_http.h>
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10
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11
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12 ngx_int_t
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13 ngx_http_parse_request_line(ngx_http_request_t *r, ngx_buf_t *b)
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14 {
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15 u_char c, ch, *p, *m;
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16 enum {
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17 sw_start = 0,
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18 sw_method,
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19 sw_space_after_method,
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20 sw_spaces_before_uri,
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21 sw_schema,
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22 sw_schema_slash,
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23 sw_schema_slash_slash,
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24 sw_host,
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25 sw_port,
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26 sw_after_slash_in_uri,
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27 sw_check_uri,
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28 sw_uri,
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29 sw_http_09,
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30 sw_http_H,
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31 sw_http_HT,
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32 sw_http_HTT,
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33 sw_http_HTTP,
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34 sw_first_major_digit,
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35 sw_major_digit,
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36 sw_first_minor_digit,
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37 sw_minor_digit,
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38 sw_almost_done
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39 } state;
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40
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41 state = r->state;
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42
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43 for (p = b->pos; p < b->last; p++) {
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44 ch = *p;
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45
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46 /* gcc 2.95.2 and msvc 6.0 compile this switch as an jump table */
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47
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48 switch (state) {
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49
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50 /* HTTP methods: GET, HEAD, POST */
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51 case sw_start:
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52 r->request_start = p;
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53
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54 if (ch == CR || ch == LF) {
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55 break;
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56 }
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57
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58 if (ch < 'A' || ch > 'Z') {
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59 return NGX_HTTP_PARSE_INVALID_METHOD;
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60 }
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61
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62 state = sw_method;
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63 break;
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64
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65 case sw_method:
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66 if (ch == ' ') {
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67 r->method_end = p - 1;
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68 m = r->request_start;
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69
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70 if (p - m == 3) {
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71
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72 if (m[0] == 'G' && m[1] == 'E' && m[2] == 'T') {
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73 r->method = NGX_HTTP_GET;
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74 }
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75
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76 } else if (p - m == 4) {
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77
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78 if (m[0] == 'P' && m[1] == 'O'
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79 && m[2] == 'S' && m[3] == 'T')
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80 {
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81 r->method = NGX_HTTP_POST;
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82
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83 } else if (m[0] == 'H' && m[1] == 'E'
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84 && m[2] == 'A' && m[3] == 'D')
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85 {
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86 r->method = NGX_HTTP_HEAD;
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87 }
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88 }
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89
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90 state = sw_spaces_before_uri;
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91 break;
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92 }
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93
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94 if (ch < 'A' || ch > 'Z') {
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95 return NGX_HTTP_PARSE_INVALID_METHOD;
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96 }
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97
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98 break;
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99
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100 /* single space after method */
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101 case sw_space_after_method:
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102 switch (ch) {
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103 case ' ':
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104 state = sw_spaces_before_uri;
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105 break;
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106 default:
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107 return NGX_HTTP_PARSE_INVALID_METHOD;
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108 }
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109 break;
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110
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111 /* space* before URI */
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112 case sw_spaces_before_uri:
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113
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114 c = (u_char) (ch | 0x20);
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115 if (c >= 'a' && c <= 'z') {
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116 r->schema_start = p;
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117 state = sw_schema;
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118 break;
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119 }
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120
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121 switch (ch) {
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122 case '/':
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123 r->uri_start = p;
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124 state = sw_after_slash_in_uri;
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125 break;
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126 case ' ':
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127 break;
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128 default:
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129 return NGX_HTTP_PARSE_INVALID_REQUEST;
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130 }
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131 break;
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132
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133 case sw_schema:
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134
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135 c = (u_char) (ch | 0x20);
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136 if (c >= 'a' && c <= 'z') {
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137 break;
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138 }
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139
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140 switch (ch) {
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141 case ':':
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142 r->schema_end = p;
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143 state = sw_schema_slash;
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144 break;
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145 default:
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146 return NGX_HTTP_PARSE_INVALID_REQUEST;
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147 }
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148 break;
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149
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150 case sw_schema_slash:
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151 switch (ch) {
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152 case '/':
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153 state = sw_schema_slash_slash;
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154 break;
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155 default:
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156 return NGX_HTTP_PARSE_INVALID_REQUEST;
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157 }
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158 break;
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159
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160 case sw_schema_slash_slash:
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161 switch (ch) {
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162 case '/':
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163 r->host_start = p;
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164 state = sw_host;
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165 break;
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166 default:
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167 return NGX_HTTP_PARSE_INVALID_REQUEST;
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168 }
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169 break;
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170
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171 case sw_host:
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172
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173 c = (u_char) (ch | 0x20);
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174 if (c >= 'a' && c <= 'z') {
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175 break;
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176 }
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177
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178 if ((ch >= '0' && ch <= '9') || ch == '.' || ch == '-')
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179 {
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180 break;
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181 }
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182
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183 switch (ch) {
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184 case ':':
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185 r->host_end = p;
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186 state = sw_port;
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187 break;
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188 case '/':
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189 r->host_end = p;
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190 r->uri_start = p;
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191 state = sw_after_slash_in_uri;
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192 break;
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193 default:
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194 return NGX_HTTP_PARSE_INVALID_REQUEST;
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195 }
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196 break;
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197
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198 case sw_port:
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199 if (ch >= '0' && ch <= '9') {
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200 break;
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201 }
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202
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203 switch (ch) {
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204 case '/':
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205 r->port_end = p;
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206 r->uri_start = p;
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207 state = sw_after_slash_in_uri;
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208 break;
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209 default:
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210 return NGX_HTTP_PARSE_INVALID_REQUEST;
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211 }
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212 break;
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213
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214 /* check "/.", "//", "%", and "\" (Win32) in URI */
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215 case sw_after_slash_in_uri:
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216
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217 c = (u_char) (ch | 0x20);
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218 if (c >= 'a' && c <= 'z') {
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219 state = sw_check_uri;
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220 break;
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221 }
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222
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223 if (ch >= '0' && ch <= '9') {
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224 state = sw_check_uri;
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225 break;
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226 }
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227
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228 switch (ch) {
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229 case ' ':
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230 r->uri_end = p;
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231 state = sw_http_09;
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232 break;
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233 case CR:
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234 r->uri_end = p;
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235 r->http_minor = 9;
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236 state = sw_almost_done;
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237 break;
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238 case LF:
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239 r->uri_end = p;
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240 r->http_minor = 9;
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241 goto done;
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242 case '.':
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243 r->complex_uri = 1;
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244 state = sw_uri;
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245 break;
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246 case '%':
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247 r->quoted_uri = 1;
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248 state = sw_uri;
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249 break;
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250 case '/':
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251 r->complex_uri = 1;
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252 state = sw_uri;
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253 break;
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254 #if (NGX_WIN32)
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255 case '\\':
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256 r->complex_uri = 1;
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257 state = sw_uri;
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258 break;
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259 #endif
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260 case '?':
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261 r->args_start = p + 1;
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262 state = sw_uri;
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263 break;
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264 case '+':
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265 r->plus_in_uri = 1;
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266 break;
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267 case '\0':
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268 r->zero_in_uri = 1;
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269 break;
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270 default:
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271 state = sw_check_uri;
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272 break;
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273 }
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274 break;
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275
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276 /* check "/", "%" and "\" (Win32) in URI */
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277 case sw_check_uri:
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278
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279 c = (u_char) (ch | 0x20);
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280 if (c >= 'a' && c <= 'z') {
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281 break;
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282 }
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283
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284 if (ch >= '0' && ch <= '9') {
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285 break;
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286 }
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287
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288 switch (ch) {
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289 case '/':
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290 r->uri_ext = NULL;
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291 state = sw_after_slash_in_uri;
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292 break;
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293 case '.':
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294 r->uri_ext = p + 1;
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295 break;
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296 case ' ':
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297 r->uri_end = p;
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298 state = sw_http_09;
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299 break;
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300 case CR:
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301 r->uri_end = p;
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302 r->http_minor = 9;
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303 state = sw_almost_done;
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304 break;
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305 case LF:
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306 r->uri_end = p;
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307 r->http_minor = 9;
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308 goto done;
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309 #if (NGX_WIN32)
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310 case '\\':
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311 r->complex_uri = 1;
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312 state = sw_after_slash_in_uri;
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313 break;
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314 #endif
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315 case '%':
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316 r->quoted_uri = 1;
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317 state = sw_uri;
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318 break;
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319 case '+':
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320 r->plus_in_uri = 1;
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321 break;
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322 case '?':
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323 r->args_start = p + 1;
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324 state = sw_uri;
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325 break;
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326 case '\0':
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327 r->zero_in_uri = 1;
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328 break;
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329 }
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330 break;
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331
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332 /* URI */
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333 case sw_uri:
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334 switch (ch) {
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335 case ' ':
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336 r->uri_end = p;
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337 state = sw_http_09;
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338 break;
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339 case CR:
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340 r->uri_end = p;
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341 r->http_minor = 9;
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342 state = sw_almost_done;
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343 break;
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344 case LF:
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345 r->uri_end = p;
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346 r->http_minor = 9;
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347 goto done;
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348 case '+':
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349 r->plus_in_uri = 1;
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350 break;
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351 case '\0':
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352 r->zero_in_uri = 1;
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353 break;
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354 }
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355 break;
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356
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357 /* space+ after URI */
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358 case sw_http_09:
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359 switch (ch) {
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360 case ' ':
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361 break;
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362 case CR:
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363 r->http_minor = 9;
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364 state = sw_almost_done;
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365 break;
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366 case LF:
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367 r->http_minor = 9;
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368 goto done;
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369 case 'H':
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370 r->http_protocol.data = p;
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371 state = sw_http_H;
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372 break;
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373 default:
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374 return NGX_HTTP_PARSE_INVALID_REQUEST;
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375 }
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376 break;
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377
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378 case sw_http_H:
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379 switch (ch) {
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380 case 'T':
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381 state = sw_http_HT;
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382 break;
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383 default:
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384 return NGX_HTTP_PARSE_INVALID_REQUEST;
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385 }
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386 break;
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387
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388 case sw_http_HT:
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389 switch (ch) {
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390 case 'T':
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391 state = sw_http_HTT;
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392 break;
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393 default:
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394 return NGX_HTTP_PARSE_INVALID_REQUEST;
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395 }
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396 break;
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397
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398 case sw_http_HTT:
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399 switch (ch) {
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400 case 'P':
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401 state = sw_http_HTTP;
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402 break;
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403 default:
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404 return NGX_HTTP_PARSE_INVALID_REQUEST;
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405 }
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406 break;
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407
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408 case sw_http_HTTP:
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409 switch (ch) {
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410 case '/':
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411 state = sw_first_major_digit;
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412 break;
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413 default:
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414 return NGX_HTTP_PARSE_INVALID_REQUEST;
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415 }
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416 break;
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417
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418 /* first digit of major HTTP version */
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419 case sw_first_major_digit:
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420 if (ch < '1' || ch > '9') {
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421 return NGX_HTTP_PARSE_INVALID_REQUEST;
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422 }
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423
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424 r->http_major = ch - '0';
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425 state = sw_major_digit;
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426 break;
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427
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428 /* major HTTP version or dot */
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429 case sw_major_digit:
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430 if (ch == '.') {
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431 state = sw_first_minor_digit;
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432 break;
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433 }
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434
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435 if (ch < '0' || ch > '9') {
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436 return NGX_HTTP_PARSE_INVALID_REQUEST;
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437 }
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438
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439 r->http_major = r->http_major * 10 + ch - '0';
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440 break;
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441
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442 /* first digit of minor HTTP version */
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443 case sw_first_minor_digit:
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444 if (ch < '0' || ch > '9') {
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445 return NGX_HTTP_PARSE_INVALID_REQUEST;
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446 }
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447
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448 r->http_minor = ch - '0';
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449 state = sw_minor_digit;
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450 break;
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451
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452 /* minor HTTP version or end of request line */
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453 case sw_minor_digit:
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454 if (ch == CR) {
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455 state = sw_almost_done;
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456 break;
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457 }
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458
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459 if (ch == LF) {
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460 goto done;
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461 }
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462
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463 if (ch < '0' || ch > '9') {
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464 return NGX_HTTP_PARSE_INVALID_REQUEST;
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465 }
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466
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467 r->http_minor = r->http_minor * 10 + ch - '0';
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468 break;
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469
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470 /* end of request line */
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471 case sw_almost_done:
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472 r->request_end = p - 1;
|
|
|
473 switch (ch) {
|
|
|
474 case LF:
|
|
|
475 goto done;
|
|
|
476 default:
|
|
|
477 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
|
478 }
|
|
|
479 }
|
|
|
480 }
|
|
|
481
|
|
|
482 b->pos = p;
|
|
|
483 r->state = state;
|
|
|
484
|
|
|
485 return NGX_AGAIN;
|
|
|
486
|
|
|
487 done:
|
|
|
488
|
|
|
489 b->pos = p + 1;
|
|
|
490
|
|
|
491 if (r->request_end == NULL) {
|
|
|
492 r->request_end = p;
|
|
|
493 }
|
|
|
494
|
|
|
495 r->http_version = r->http_major * 1000 + r->http_minor;
|
|
|
496 r->state = sw_start;
|
|
|
497
|
|
|
498 if (r->http_version == 9 && r->method != NGX_HTTP_GET) {
|
|
|
499 return NGX_HTTP_PARSE_INVALID_09_METHOD;
|
|
|
500 }
|
|
|
501
|
|
|
502 return NGX_OK;
|
|
|
503 }
|
|
|
504
|
|
|
505
|
|
|
506 ngx_int_t
|
|
|
507 ngx_http_parse_header_line(ngx_http_request_t *r, ngx_buf_t *b)
|
|
|
508 {
|
|
|
509 u_char c, ch, *p;
|
|
|
510 ngx_uint_t hash;
|
|
|
511 enum {
|
|
|
512 sw_start = 0,
|
|
|
513 sw_name,
|
|
|
514 sw_space_before_value,
|
|
|
515 sw_value,
|
|
|
516 sw_space_after_value,
|
|
|
517 sw_ignore_line,
|
|
|
518 sw_almost_done,
|
|
|
519 sw_header_almost_done
|
|
|
520 } state;
|
|
|
521
|
|
|
522 state = r->state;
|
|
|
523 hash = r->header_hash;
|
|
|
524
|
|
|
525 for (p = b->pos; p < b->last; p++) {
|
|
|
526 ch = *p;
|
|
|
527
|
|
|
528 switch (state) {
|
|
|
529
|
|
|
530 /* first char */
|
|
|
531 case sw_start:
|
|
|
532 r->invalid_header = 0;
|
|
|
533
|
|
|
534 switch (ch) {
|
|
|
535 case CR:
|
|
|
536 r->header_end = p;
|
|
|
537 state = sw_header_almost_done;
|
|
|
538 break;
|
|
|
539 case LF:
|
|
|
540 r->header_end = p;
|
|
|
541 goto header_done;
|
|
|
542 default:
|
|
|
543 state = sw_name;
|
|
|
544 r->header_name_start = p;
|
|
|
545
|
|
|
546 c = (u_char) (ch | 0x20);
|
|
|
547 if (c >= 'a' && c <= 'z') {
|
|
|
548 hash = c;
|
|
|
549 break;
|
|
|
550 }
|
|
|
551
|
|
|
552 if (ch >= '0' && ch <= '9') {
|
|
|
553 hash = ch;
|
|
|
554 break;
|
|
|
555 }
|
|
|
556
|
|
|
557 r->invalid_header = 1;
|
|
|
558
|
|
|
559 break;
|
|
|
560
|
|
|
561 }
|
|
|
562 break;
|
|
|
563
|
|
|
564 /* header name */
|
|
|
565 case sw_name:
|
|
|
566 c = (u_char) (ch | 0x20);
|
|
|
567 if (c >= 'a' && c <= 'z') {
|
|
|
568 hash += c;
|
|
|
569 break;
|
|
|
570 }
|
|
|
571
|
|
|
572 if (ch == ':') {
|
|
|
573 r->header_name_end = p;
|
|
|
574 state = sw_space_before_value;
|
|
|
575 break;
|
|
|
576 }
|
|
|
577
|
|
|
578 if (ch == '-') {
|
|
|
579 hash += ch;
|
|
|
580 break;
|
|
|
581 }
|
|
|
582
|
|
|
583 if (ch >= '0' && ch <= '9') {
|
|
|
584 hash += ch;
|
|
|
585 break;
|
|
|
586 }
|
|
|
587
|
|
|
588 if (ch == CR) {
|
|
|
589 r->header_name_end = p;
|
|
|
590 r->header_start = p;
|
|
|
591 r->header_end = p;
|
|
|
592 state = sw_almost_done;
|
|
|
593 break;
|
|
|
594 }
|
|
|
595
|
|
|
596 if (ch == LF) {
|
|
|
597 r->header_name_end = p;
|
|
|
598 r->header_start = p;
|
|
|
599 r->header_end = p;
|
|
|
600 goto done;
|
|
|
601 }
|
|
|
602
|
|
|
603 /* IIS may send the duplicate "HTTP/1.1 ..." lines */
|
|
|
604 if (ch == '/'
|
|
|
605 && r->upstream
|
|
|
606 && p - r->header_name_start == 4
|
|
|
607 && ngx_strncmp(r->header_name_start, "HTTP", 4) == 0)
|
|
|
608 {
|
|
|
609 state = sw_ignore_line;
|
|
|
610 break;
|
|
|
611 }
|
|
|
612
|
|
|
613 r->invalid_header = 1;
|
|
|
614
|
|
|
615 break;
|
|
|
616
|
|
|
617 /* space* before header value */
|
|
|
618 case sw_space_before_value:
|
|
|
619 switch (ch) {
|
|
|
620 case ' ':
|
|
|
621 break;
|
|
|
622 case CR:
|
|
|
623 r->header_start = p;
|
|
|
624 r->header_end = p;
|
|
|
625 state = sw_almost_done;
|
|
|
626 break;
|
|
|
627 case LF:
|
|
|
628 r->header_start = p;
|
|
|
629 r->header_end = p;
|
|
|
630 goto done;
|
|
|
631 default:
|
|
|
632 r->header_start = p;
|
|
|
633 state = sw_value;
|
|
|
634 break;
|
|
|
635 }
|
|
|
636 break;
|
|
|
637
|
|
|
638 /* header value */
|
|
|
639 case sw_value:
|
|
|
640 switch (ch) {
|
|
|
641 case ' ':
|
|
|
642 r->header_end = p;
|
|
|
643 state = sw_space_after_value;
|
|
|
644 break;
|
|
|
645 case CR:
|
|
|
646 r->header_end = p;
|
|
|
647 state = sw_almost_done;
|
|
|
648 break;
|
|
|
649 case LF:
|
|
|
650 r->header_end = p;
|
|
|
651 goto done;
|
|
|
652 }
|
|
|
653 break;
|
|
|
654
|
|
|
655 /* space* before end of header line */
|
|
|
656 case sw_space_after_value:
|
|
|
657 switch (ch) {
|
|
|
658 case ' ':
|
|
|
659 break;
|
|
|
660 case CR:
|
|
|
661 state = sw_almost_done;
|
|
|
662 break;
|
|
|
663 case LF:
|
|
|
664 goto done;
|
|
|
665 default:
|
|
|
666 state = sw_value;
|
|
|
667 break;
|
|
|
668 }
|
|
|
669 break;
|
|
|
670
|
|
|
671 /* ignore header line */
|
|
|
672 case sw_ignore_line:
|
|
|
673 switch (ch) {
|
|
|
674 case LF:
|
|
|
675 state = sw_start;
|
|
|
676 break;
|
|
|
677 default:
|
|
|
678 break;
|
|
|
679 }
|
|
|
680 break;
|
|
|
681
|
|
|
682 /* end of header line */
|
|
|
683 case sw_almost_done:
|
|
|
684 switch (ch) {
|
|
|
685 case CR:
|
|
|
686 break;
|
|
|
687 case LF:
|
|
|
688 goto done;
|
|
|
689 default:
|
|
|
690 return NGX_HTTP_PARSE_INVALID_HEADER;
|
|
|
691 }
|
|
|
692
|
|
|
693 /* end of header */
|
|
|
694 case sw_header_almost_done:
|
|
|
695 switch (ch) {
|
|
|
696 case LF:
|
|
|
697 goto header_done;
|
|
|
698 default:
|
|
|
699 return NGX_HTTP_PARSE_INVALID_HEADER;
|
|
|
700 }
|
|
|
701 }
|
|
|
702 }
|
|
|
703
|
|
|
704 b->pos = p;
|
|
|
705 r->state = state;
|
|
|
706 r->header_hash = hash;
|
|
|
707
|
|
|
708 return NGX_AGAIN;
|
|
|
709
|
|
|
710 done:
|
|
|
711
|
|
|
712 b->pos = p + 1;
|
|
|
713 r->state = sw_start;
|
|
|
714 r->header_hash = hash;
|
|
|
715
|
|
|
716 return NGX_OK;
|
|
|
717
|
|
|
718 header_done:
|
|
|
719
|
|
|
720 b->pos = p + 1;
|
|
|
721 r->state = sw_start;
|
|
|
722
|
|
|
723 return NGX_HTTP_PARSE_HEADER_DONE;
|
|
|
724 }
|
|
|
725
|
|
|
726
|
|
|
727 ngx_int_t
|
|
|
728 ngx_http_parse_complex_uri(ngx_http_request_t *r)
|
|
|
729 {
|
|
|
730 u_char c, ch, decoded, *p, *u;
|
|
|
731 enum {
|
|
|
732 sw_usual = 0,
|
|
|
733 sw_slash,
|
|
|
734 sw_dot,
|
|
|
735 sw_dot_dot,
|
|
|
736 #if (NGX_WIN32)
|
|
|
737 sw_dot_dot_dot,
|
|
|
738 #endif
|
|
|
739 sw_quoted,
|
|
|
740 sw_quoted_second
|
|
|
741 } state, quoted_state;
|
|
|
742
|
|
|
743 #if (NGX_SUPPRESS_WARN)
|
|
|
744 decoded = '\0';
|
|
|
745 quoted_state = sw_usual;
|
|
|
746 #endif
|
|
|
747
|
|
|
748 state = sw_usual;
|
|
|
749 p = r->uri_start;
|
|
|
750 u = r->uri.data;
|
|
|
751 r->uri_ext = NULL;
|
|
|
752 r->args_start = NULL;
|
|
|
753
|
|
|
754 ch = *p++;
|
|
|
755
|
|
|
756 while (p <= r->uri_end) {
|
|
|
757
|
|
|
758 /*
|
|
|
759 * we use "ch = *p++" inside the cycle, but this operation is safe,
|
|
|
760 * because after the URI there is always at least one charcter:
|
|
|
761 * the line feed
|
|
|
762 */
|
|
|
763
|
|
|
764 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
|
765 "s:%d in:'%Xd:%c', out:'%c'", state, ch, ch, *u);
|
|
|
766
|
|
|
767 switch (state) {
|
|
|
768
|
|
|
769 case sw_usual:
|
|
|
770 switch(ch) {
|
|
|
771 #if (NGX_WIN32)
|
|
|
772 case '\\':
|
|
|
773 r->uri_ext = NULL;
|
|
|
774
|
|
|
775 if (p == r->uri_start + r->uri.len) {
|
|
|
776
|
|
|
777 /*
|
|
|
778 * we omit the last "\" to cause redirect because
|
|
|
779 * the browsers do not treat "\" as "/" in relative URL path
|
|
|
780 */
|
|
|
781
|
|
|
782 break;
|
|
|
783 }
|
|
|
784
|
|
|
785 state = sw_slash;
|
|
|
786 *u++ = '/';
|
|
|
787 break;
|
|
|
788 #endif
|
|
|
789 case '/':
|
|
|
790 r->uri_ext = NULL;
|
|
|
791 state = sw_slash;
|
|
|
792 *u++ = ch;
|
|
|
793 break;
|
|
|
794 case '%':
|
|
|
795 quoted_state = state;
|
|
|
796 state = sw_quoted;
|
|
|
797 break;
|
|
|
798 case '?':
|
|
|
799 r->args_start = p;
|
|
|
800 goto done;
|
|
|
801 case '.':
|
|
|
802 r->uri_ext = u + 1;
|
|
|
803 *u++ = ch;
|
|
|
804 break;
|
|
|
805 default:
|
|
|
806 *u++ = ch;
|
|
|
807 break;
|
|
|
808 }
|
|
|
809 ch = *p++;
|
|
|
810 break;
|
|
|
811
|
|
|
812 case sw_slash:
|
|
|
813 switch(ch) {
|
|
|
814 #if (NGX_WIN32)
|
|
|
815 case '\\':
|
|
|
816 #endif
|
|
|
817 case '/':
|
|
|
818 break;
|
|
|
819 case '.':
|
|
|
820 state = sw_dot;
|
|
|
821 *u++ = ch;
|
|
|
822 break;
|
|
|
823 case '%':
|
|
|
824 quoted_state = state;
|
|
|
825 state = sw_quoted;
|
|
|
826 break;
|
|
|
827 case '?':
|
|
|
828 r->args_start = p;
|
|
|
829 goto done;
|
|
|
830 default:
|
|
|
831 state = sw_usual;
|
|
|
832 *u++ = ch;
|
|
|
833 break;
|
|
|
834 }
|
|
|
835 ch = *p++;
|
|
|
836 break;
|
|
|
837
|
|
|
838 case sw_dot:
|
|
|
839 switch(ch) {
|
|
|
840 #if (NGX_WIN32)
|
|
|
841 case '\\':
|
|
|
842 #endif
|
|
|
843 case '/':
|
|
|
844 state = sw_slash;
|
|
|
845 u--;
|
|
|
846 break;
|
|
|
847 case '.':
|
|
|
848 state = sw_dot_dot;
|
|
|
849 *u++ = ch;
|
|
|
850 break;
|
|
|
851 case '%':
|
|
|
852 quoted_state = state;
|
|
|
853 state = sw_quoted;
|
|
|
854 break;
|
|
|
855 case '?':
|
|
|
856 r->args_start = p;
|
|
|
857 goto done;
|
|
|
858 default:
|
|
|
859 state = sw_usual;
|
|
|
860 *u++ = ch;
|
|
|
861 break;
|
|
|
862 }
|
|
|
863 ch = *p++;
|
|
|
864 break;
|
|
|
865
|
|
|
866 case sw_dot_dot:
|
|
|
867 switch(ch) {
|
|
|
868 #if (NGX_WIN32)
|
|
|
869 case '\\':
|
|
|
870 #endif
|
|
|
871 case '/':
|
|
|
872 state = sw_slash;
|
|
|
873 u -= 4;
|
|
|
874 if (u < r->uri.data) {
|
|
|
875 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
|
876 }
|
|
|
877 while (*(u - 1) != '/') {
|
|
|
878 u--;
|
|
|
879 }
|
|
|
880 break;
|
|
|
881 case '%':
|
|
|
882 quoted_state = state;
|
|
|
883 state = sw_quoted;
|
|
|
884 break;
|
|
|
885 case '?':
|
|
|
886 r->args_start = p;
|
|
|
887 goto done;
|
|
|
888 #if (NGX_WIN32)
|
|
|
889 case '.':
|
|
|
890 state = sw_dot_dot_dot;
|
|
|
891 *u++ = ch;
|
|
|
892 break;
|
|
|
893 #endif
|
|
|
894 default:
|
|
|
895 state = sw_usual;
|
|
|
896 *u++ = ch;
|
|
|
897 break;
|
|
|
898 }
|
|
|
899 ch = *p++;
|
|
|
900 break;
|
|
|
901
|
|
|
902 #if (NGX_WIN32)
|
|
|
903 case sw_dot_dot_dot:
|
|
|
904 switch(ch) {
|
|
|
905 case '\\':
|
|
|
906 case '/':
|
|
|
907 state = sw_slash;
|
|
|
908 u -= 5;
|
|
|
909 if (u < r->uri.data) {
|
|
|
910 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
|
911 }
|
|
|
912 while (*u != '/') {
|
|
|
913 u--;
|
|
|
914 }
|
|
|
915 if (u < r->uri.data) {
|
|
|
916 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
|
917 }
|
|
|
918 while (*(u - 1) != '/') {
|
|
|
919 u--;
|
|
|
920 }
|
|
|
921 break;
|
|
|
922 case '%':
|
|
|
923 quoted_state = state;
|
|
|
924 state = sw_quoted;
|
|
|
925 break;
|
|
|
926 case '?':
|
|
|
927 r->args_start = p;
|
|
|
928 goto done;
|
|
|
929 default:
|
|
|
930 state = sw_usual;
|
|
|
931 *u++ = ch;
|
|
|
932 break;
|
|
|
933 }
|
|
|
934 ch = *p++;
|
|
|
935 break;
|
|
|
936 #endif
|
|
|
937
|
|
|
938 case sw_quoted:
|
|
|
939 if (ch >= '0' && ch <= '9') {
|
|
|
940 decoded = (u_char) (ch - '0');
|
|
|
941 state = sw_quoted_second;
|
|
|
942 ch = *p++;
|
|
|
943 break;
|
|
|
944 }
|
|
|
945
|
|
|
946 c = (u_char) (ch | 0x20);
|
|
|
947 if (c >= 'a' && c <= 'f') {
|
|
|
948 decoded = (u_char) (c - 'a' + 10);
|
|
|
949 state = sw_quoted_second;
|
|
|
950 ch = *p++;
|
|
|
951 break;
|
|
|
952 }
|
|
|
953
|
|
|
954 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
|
955
|
|
|
956 case sw_quoted_second:
|
|
|
957 if (ch >= '0' && ch <= '9') {
|
|
|
958 ch = (u_char) ((decoded << 4) + ch - '0');
|
|
|
959
|
|
|
960 if (ch == '%') {
|
|
|
961 state = sw_usual;
|
|
|
962 *u++ = ch;
|
|
|
963 ch = *p++;
|
|
|
964 break;
|
|
|
965 }
|
|
|
966
|
|
|
967 if (ch == '\0') {
|
|
|
968 r->zero_in_uri = 1;
|
|
|
969 *u++ = ch;
|
|
|
970 ch = *p++;
|
|
|
971 }
|
|
|
972
|
|
|
973 state = quoted_state;
|
|
|
974 break;
|
|
|
975 }
|
|
|
976
|
|
|
977 c = (u_char) (ch | 0x20);
|
|
|
978 if (c >= 'a' && c <= 'f') {
|
|
|
979 ch = (u_char) ((decoded << 4) + c - 'a' + 10);
|
|
|
980 if (ch == '?') {
|
|
|
981 *u++ = ch;
|
|
|
982 ch = *p++;
|
|
|
983 }
|
|
|
984 state = quoted_state;
|
|
|
985 break;
|
|
|
986 }
|
|
|
987
|
|
|
988 return NGX_HTTP_PARSE_INVALID_REQUEST;
|
|
|
989 }
|
|
|
990 }
|
|
|
991
|
|
|
992 done:
|
|
|
993
|
|
|
994 r->uri.len = u - r->uri.data;
|
|
|
995 r->uri.data[r->uri.len] = '\0';
|
|
|
996
|
|
|
997 if (r->uri_ext) {
|
|
|
998 r->exten.len = u - r->uri_ext;
|
|
|
999 r->exten.data = r->uri_ext;
|
|
|
1000 }
|
|
|
1001
|
|
|
1002 r->uri_ext = NULL;
|
|
|
1003
|
|
|
1004 return NGX_OK;
|
|
|
1005 }
|
|
|
1006
|
|
|
1007
|
|
|
1008 ngx_int_t
|
|
|
1009 ngx_http_parse_unsafe_uri(ngx_http_request_t *r, ngx_str_t *uri,
|
|
|
1010 ngx_str_t *args, ngx_uint_t *flags)
|
|
|
1011 {
|
|
|
1012 u_char ch, *p;
|
|
|
1013 size_t len;
|
|
|
1014
|
|
|
1015 len = uri->len;
|
|
|
1016 p = uri->data;
|
|
|
1017
|
|
|
1018 if (len == 0 || p[0] == '?') {
|
|
|
1019 goto unsafe;
|
|
|
1020 }
|
|
|
1021
|
|
|
1022 if (p[0] == '.' && len == 3 && p[1] == '.' && (p[2] == '/'
|
|
|
1023 #if (NGX_WIN32)
|
|
|
1024 || p[2] == '\\'
|
|
|
1025 #endif
|
|
|
1026 ))
|
|
|
1027 {
|
|
|
1028 goto unsafe;
|
|
|
1029 }
|
|
|
1030
|
|
|
1031 for ( /* void */ ; len; len--) {
|
|
|
1032
|
|
|
1033 ch = *p++;
|
|
|
1034
|
|
|
1035 if (ch == '?') {
|
|
|
1036 args->len = len - 1;
|
|
|
1037 args->data = p;
|
|
|
1038 uri->len -= len;
|
|
|
1039
|
|
|
1040 return NGX_OK;
|
|
|
1041 }
|
|
|
1042
|
|
|
1043 if (ch == '\0') {
|
|
|
1044 *flags |= NGX_HTTP_ZERO_IN_URI;
|
|
|
1045 continue;
|
|
|
1046 }
|
|
|
1047
|
|
|
1048 if (ch != '/'
|
|
|
1049 #if (NGX_WIN32)
|
|
|
1050 && ch != '\\'
|
|
|
1051 #endif
|
|
|
1052 )
|
|
|
1053 {
|
|
|
1054 continue;
|
|
|
1055 }
|
|
|
1056
|
|
|
1057 if (len > 2) {
|
|
|
1058
|
|
|
1059 /* detect "/../" */
|
|
|
1060
|
|
|
1061 if (p[0] == '.' && p[1] == '.' && p[2] == '/') {
|
|
|
1062 goto unsafe;
|
|
|
1063 }
|
|
|
1064
|
|
|
1065 #if (NGX_WIN32)
|
|
|
1066
|
|
|
1067 if (p[2] == '\\') {
|
|
|
1068 goto unsafe;
|
|
|
1069 }
|
|
|
1070
|
|
|
1071 if (len > 3) {
|
|
|
1072
|
|
|
1073 /* detect "/.../" */
|
|
|
1074
|
|
|
1075 if (p[0] == '.' && p[1] == '.' && p[2] == '.'
|
|
|
1076 && (p[3] == '/' || p[3] == '\\'))
|
|
|
1077 {
|
|
|
1078 goto unsafe;
|
|
|
1079 }
|
|
|
1080 }
|
|
|
1081 #endif
|
|
|
1082 }
|
|
|
1083 }
|
|
|
1084
|
|
|
1085 return NGX_OK;
|
|
|
1086
|
|
|
1087 unsafe:
|
|
|
1088
|
|
|
1089 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
|
|
|
1090 "unsafe URI \"%V\" was detected", uri);
|
|
|
1091
|
|
|
1092 return NGX_ERROR;
|
|
|
1093 }
|
|
|
1094
|
|
|
1095
|
|
|
1096 ngx_int_t
|
|
|
1097 ngx_http_parse_multi_header_lines(ngx_array_t *headers, ngx_str_t *name,
|
|
|
1098 ngx_str_t *value)
|
|
|
1099 {
|
|
|
1100 ngx_uint_t i;
|
|
|
1101 u_char *start, *last, *end, ch;
|
|
|
1102 ngx_table_elt_t **h;
|
|
|
1103
|
|
|
1104 h = headers->elts;
|
|
|
1105
|
|
|
1106 for (i = 0; i < headers->nelts; i++) {
|
|
|
1107
|
|
|
1108 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, headers->pool->log, 0,
|
|
|
1109 "parse header: \"%V: %V\"", &h[i]->key, &h[i]->value);
|
|
|
1110
|
|
|
1111 if (name->len > h[i]->value.len) {
|
|
|
1112 continue;
|
|
|
1113 }
|
|
|
1114
|
|
|
1115 start = h[i]->value.data;
|
|
|
1116 end = h[i]->value.data + h[i]->value.len;
|
|
|
1117
|
|
|
1118 while (start < end) {
|
|
|
1119
|
|
|
1120 if (ngx_strncasecmp(start, name->data, name->len) != 0) {
|
|
|
1121 goto skip;
|
|
|
1122 }
|
|
|
1123
|
|
|
1124 for (start += name->len; start < end && *start == ' '; start++) {
|
|
|
1125 /* void */
|
|
|
1126 }
|
|
|
1127
|
|
|
1128 if (value == NULL) {
|
|
|
1129 if (start == end || *start == ',') {
|
|
|
1130 return i;
|
|
|
1131 }
|
|
|
1132
|
|
|
1133 goto skip;
|
|
|
1134 }
|
|
|
1135
|
|
|
1136 if (start == end || *start++ != '=') {
|
|
|
1137 /* the invalid header value */
|
|
|
1138 goto skip;
|
|
|
1139 }
|
|
|
1140
|
|
|
1141 while (start < end && *start == ' ') { start++; }
|
|
|
1142
|
|
|
1143 for (last = start; last < end && *last != ';'; last++) {
|
|
|
1144 /* void */
|
|
|
1145 }
|
|
|
1146
|
|
|
1147 value->len = last - start;
|
|
|
1148 value->data = start;
|
|
|
1149
|
|
|
1150 return i;
|
|
|
1151
|
|
|
1152 skip:
|
|
|
1153
|
|
|
1154 while (start < end) {
|
|
|
1155 ch = *start++;
|
|
|
1156 if (ch == ';' || ch == ',') {
|
|
|
1157 break;
|
|
|
1158 }
|
|
|
1159 }
|
|
|
1160
|
|
|
1161 while (start < end && *start == ' ') { start++; }
|
|
|
1162 }
|
|
|
1163 }
|
|
|
1164
|
|
|
1165 return NGX_DECLINED;
|
|
|
1166 }
|
