| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* we need some of the portability definitions... for strchr */ |
| #include "httpd.h" |
| |
| /* A bunch of functions in util.c scan strings looking for certain characters. |
| * To make that more efficient we encode a lookup table. |
| */ |
| #define T_ESCAPE_SHELL_CMD (0x01) |
| #define T_ESCAPE_PATH_SEGMENT (0x02) |
| #define T_OS_ESCAPE_PATH (0x04) |
| #define T_HTTP_TOKEN_STOP (0x08) |
| #define T_ESCAPE_LOGITEM (0x10) |
| #define T_ESCAPE_FORENSIC (0x20) |
| |
| int main(int argc, char *argv[]) |
| { |
| unsigned c; |
| unsigned char flags; |
| |
| printf( |
| "/* this file is automatically generated by gen_test_char, do not edit */\n" |
| "#define T_ESCAPE_SHELL_CMD 0x%02x /* chars with special meaning in the shell */\n" |
| "#define T_ESCAPE_PATH_SEGMENT 0x%02x /* find path segment, as defined in RFC1808 */\n" |
| "#define T_OS_ESCAPE_PATH 0x%02x /* escape characters in a path or uri */\n" |
| "#define T_HTTP_TOKEN_STOP 0x%02x /* find http tokens, as defined in RFC2616 */\n" |
| "#define T_ESCAPE_LOGITEM 0x%02x /* filter what should go in the log file */\n" |
| "#define T_ESCAPE_FORENSIC 0x%02x /* filter what should go in the forensic log */\n" |
| "\n", |
| T_ESCAPE_SHELL_CMD, |
| T_ESCAPE_PATH_SEGMENT, |
| T_OS_ESCAPE_PATH, |
| T_HTTP_TOKEN_STOP, |
| T_ESCAPE_LOGITEM, |
| T_ESCAPE_FORENSIC |
| ); |
| |
| printf("static const unsigned char test_char_table[256] = {\n" |
| " "); |
| |
| for (c = 0; c < 256; ++c) { |
| flags = 0; |
| |
| /* escape_shell_cmd */ |
| #if defined(WIN32) || defined(OS2) |
| /* Win32/OS2 have many of the same vulnerable characters |
| * as Unix sh, plus the carriage return and percent char. |
| * The proper escaping of these characters varies from unix |
| * since Win32/OS2 use carets or doubled-double quotes, |
| * and neither lf nor cr can be escaped. We escape unix |
| * specific as well, to assure that cross-compiled unix |
| * applications behave similiarly when invoked on win32/os2. |
| */ |
| if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n\r%", c)) { |
| flags |= T_ESCAPE_SHELL_CMD; |
| } |
| #else |
| if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n", c)) { |
| flags |= T_ESCAPE_SHELL_CMD; |
| } |
| #endif |
| |
| if (!ap_isalnum(c) && !strchr("$-_.+!*'(),:@&=~", c)) { |
| flags |= T_ESCAPE_PATH_SEGMENT; |
| } |
| |
| if (!ap_isalnum(c) && !strchr("$-_.+!*'(),:@&=/~", c)) { |
| flags |= T_OS_ESCAPE_PATH; |
| } |
| |
| /* these are the "tspecials" from RFC2068 */ |
| if (c && (ap_iscntrl(c) || strchr(" \t()<>@,;:\\/[]?={}", c))) { |
| flags |= T_HTTP_TOKEN_STOP; |
| } |
| |
| /* For logging, escape all control characters, |
| * double quotes (because they delimit the request in the log file) |
| * backslashes (because we use backslash for escaping) |
| * and 8-bit chars with the high bit set |
| */ |
| if (c && (!ap_isprint(c) || c == '"' || c == '\\' || ap_iscntrl(c))) { |
| flags |= T_ESCAPE_LOGITEM; |
| } |
| |
| /* For forensic logging, escape all control characters, top bit set, |
| * :, | (used as delimiters) and % (used for escaping). |
| */ |
| if (!ap_isprint(c) || c == ':' || c == '|' || c == '%' |
| || ap_iscntrl(c) || !c) { |
| flags |= T_ESCAPE_FORENSIC; |
| } |
| |
| printf("0x%02x%s", flags, (c < 255) ? ", " : " "); |
| |
| if ((c % 8) == 7) |
| printf(" /*0x%02x...0x%02x*/\n ", c-7, c); |
| } |
| printf("\n};\n"); |
| |
| return 0; |
| } |