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Diffstat (limited to 'server/gen_test_char.c')
| -rw-r--r-- | server/gen_test_char.c | 192 |
1 files changed, 192 insertions, 0 deletions
diff --git a/server/gen_test_char.c b/server/gen_test_char.c new file mode 100644 index 0000000..248216b --- /dev/null +++ b/server/gen_test_char.c @@ -0,0 +1,192 @@ +/* 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. + */ + +#ifdef CROSS_COMPILE + +#include <ctype.h> +#define apr_isalnum(c) (isalnum(((unsigned char)(c)))) +#define apr_isalpha(c) (isalpha(((unsigned char)(c)))) +#define apr_iscntrl(c) (iscntrl(((unsigned char)(c)))) +#define apr_isprint(c) (isprint(((unsigned char)(c)))) +#define APR_HAVE_STDIO_H 1 +#define APR_HAVE_STRING_H 1 + +#else + +#include "apr.h" +#include "apr_lib.h" + +#endif + +#if defined(WIN32) || defined(OS2) +#define NEED_ENHANCED_ESCAPES +#endif + +#if APR_HAVE_STDIO_H +#include <stdio.h> +#endif +#if APR_HAVE_STRING_H +#include <string.h> +#endif + +/* 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) +#define T_ESCAPE_URLENCODED (0x40) +#define T_HTTP_CTRLS (0x80) +#define T_VCHAR_OBSTEXT (0x100) +#define T_URI_UNRESERVED (0x200) + +int main(int argc, char *argv[]) +{ + unsigned c; + unsigned short flags; + + printf("/* this file is automatically generated by gen_test_char, " + "do not edit */\n" + "#define T_ESCAPE_SHELL_CMD (%u)\n" + "#define T_ESCAPE_PATH_SEGMENT (%u)\n" + "#define T_OS_ESCAPE_PATH (%u)\n" + "#define T_HTTP_TOKEN_STOP (%u)\n" + "#define T_ESCAPE_LOGITEM (%u)\n" + "#define T_ESCAPE_FORENSIC (%u)\n" + "#define T_ESCAPE_URLENCODED (%u)\n" + "#define T_HTTP_CTRLS (%u)\n" + "#define T_VCHAR_OBSTEXT (%u)\n" + "#define T_URI_UNRESERVED (%u)\n" + "\n" + "static const unsigned short test_char_table[256] = {", + T_ESCAPE_SHELL_CMD, + T_ESCAPE_PATH_SEGMENT, + T_OS_ESCAPE_PATH, + T_HTTP_TOKEN_STOP, + T_ESCAPE_LOGITEM, + T_ESCAPE_FORENSIC, + T_ESCAPE_URLENCODED, + T_HTTP_CTRLS, + T_VCHAR_OBSTEXT, + T_URI_UNRESERVED + ); + + for (c = 0; c < 256; ++c) { + flags = 0; + if (c % 8 == 0) + printf("\n "); + + /* escape_shell_cmd */ +#ifdef NEED_ENHANCED_ESCAPES + /* 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 similarly when invoked on win32/os2. + * + * Rem please keep in-sync with apr's list in win32/filesys.c + */ + if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n\r%", c)) { + flags |= T_ESCAPE_SHELL_CMD; + } +#else + if (c && strchr("&;`'\"|*?~<>^()[]{}$\\\n", c)) { + flags |= T_ESCAPE_SHELL_CMD; + } +#endif + + if (!apr_isalnum(c) && !strchr("$-_.+!*'(),:@&=~", c)) { + flags |= T_ESCAPE_PATH_SEGMENT; + } + + if (!apr_isalnum(c) && !strchr("$-_.+!*'(),:;@&=/~", c)) { + flags |= T_OS_ESCAPE_PATH; + } + + if (!apr_isalnum(c) && !strchr(".-*_ ", c)) { + flags |= T_ESCAPE_URLENCODED; + } + + /* Stop for any non-'token' character, including ctrls, obs-text, + * and "tspecials" (RFC2068) a.k.a. "separators" (RFC2616), which + * is easier to express as characters remaining in the ASCII token set + */ + if (!c || !(apr_isalnum(c) || strchr("!#$%&'*+-.^_`|~", c))) { + flags |= T_HTTP_TOKEN_STOP; + } + + /* Catch CTRLs other than VCHAR, HT and SP, and obs-text (RFC7230 3.2) + * This includes only the C0 plane, not C1 (which is obs-text itself.) + * XXX: We should verify that all ASCII C0 ctrls/DEL corresponding to + * the current EBCDIC translation are captured, and ASCII C1 ctrls + * corresponding are all permitted (as they fall under obs-text rule) + */ + if (!c || (apr_iscntrl(c) && c != '\t')) { + flags |= T_HTTP_CTRLS; + } + + /* From RFC3986, the specific sets of gen-delims, sub-delims (2.2), + * and unreserved (2.3) that are possible somewhere within a URI. + * Spec requires all others to be %XX encoded, including obs-text. + */ + if (c && !apr_iscntrl(c) && c != ' ') { + flags |= T_VCHAR_OBSTEXT; + } + + /* 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 && (!apr_isprint(c) || c == '"' || c == '\\' || apr_iscntrl(c))) { + flags |= T_ESCAPE_LOGITEM; + } + + /* For forensic logging, escape all control characters, top bit set, + * :, | (used as delimiters) and % (used for escaping). + */ + if (!apr_isprint(c) || c == ':' || c == '|' || c == '%' + || apr_iscntrl(c) || !c) { + flags |= T_ESCAPE_FORENSIC; + } + + /* Characters in the RFC 3986 "unreserved" set. + * https://datatracker.ietf.org/doc/html/rfc3986#section-2.3 */ + if (c && (apr_isalnum(c) || strchr("-._~", c))) { + flags |= T_URI_UNRESERVED; + } + + printf("0x%03x%c", flags, (c < 255) ? ',' : ' '); + } + + printf("\n};\n\n"); + + printf( + "/* we assume the folks using this ensure 0 <= c < 256... which means\n" + " * you need a cast to (unsigned char) first, you can't just plug a\n" + " * char in here and get it to work, because if char is signed then it\n" + " * will first be sign extended.\n" + " */\n" + "#define TEST_CHAR(c, f) (test_char_table[(unsigned char)(c)] & (f))\n" + ); + + return 0; +} |