--- parser3/src/main/untaint.C 2001/04/28 13:38:15 1.47 +++ parser3/src/main/untaint.C 2001/10/29 16:29:08 1.71 @@ -2,14 +2,11 @@ Parser: String class part: untaint mechanizm. Copyright(c) 2001 ArtLebedev Group(http://www.artlebedev.com) - Author: Alexander Petrosyan (http://design.ru/paf) - $Id: untaint.C,v 1.47 2001/04/28 13:38:15 paf Exp $ + $Id: untaint.C,v 1.71 2001/10/29 16:29:08 paf Exp $ */ -#include "pa_config_includes.h" - #include "pa_pool.h" #include "pa_string.h" #include "pa_hash.h" @@ -17,6 +14,8 @@ #include "pa_table.h" #include "pa_globals.h" #include "pa_sql_connection.h" +#include "pa_dictionary.h" +#include "pa_common.h" #define escape(action) \ { \ @@ -32,13 +31,13 @@ char chunk[3]={prefix}; \ chunk[1]=hex[((unsigned char)*src)/0x10]; \ chunk[2]=hex[((unsigned char)*src)%0x10]; \ - strncpy(dest, chunk, 3); dest+=3; \ + memcpy(dest, chunk, 3); dest+=3; \ } else \ *dest++=*src; \ break #define to_char(c) *dest++=c #define to_string(b, bsize) \ - strncpy(dest, b, bsize); \ + memcpy(dest, b, bsize); \ dest+=bsize; \ inline bool need_file_encode(unsigned char c){ @@ -64,6 +63,32 @@ inline bool need_http_header_encode(unsi return need_uri_encode(c); } +// + +static const char * String_Untaint_lang_name[]={ + "U", ///< zero value handy for hash lookup @see untaint_lang_name2enum + "C", ///< clean + "T", ///< tainted, untaint language as assigned later + // untaint languages. assigned by ^untaint[lang]{...} + "P", + /**< + leave language built into string being appended. + just a flag, that value not stored + */ + "A", ///< leave all characters intact + "F", ///< file specification + "H", ///< ext in HTTP response header + "M", ///< text in mail header + "URI", ///< text in uri + "T", ///< ^table:set body + "SQL", ///< ^table:sql body + "JS", ///< JavaScript code + "XML", ///< ^dom:set xml + "HTML", ///< HTML code (for editing) + "UHTML", ///< HTML code with USER chars +}; + + // String static bool typo_present(Array::Item *value, const void *info) { @@ -119,39 +144,71 @@ inline bool need_quote_http_header(const return false; } -/** - @todo fix theoretical \n mem overrun in TYPO replacements +/** @todo maybe additional check "are all pieces are clean?" would be profitable? + @todo fix potential forigins_mode buf overrun +*/ +size_t String::cstr_bufsize(Untaint_lang lang) const { + return ( + lang==UL_AS_IS? + size() + : + size() + *UNTAINT_TIMES_BIGGER + *(forigins_mode?10:1) + ) + +1; +} + +/** @todo fix theoretical \n mem overrun in TYPO replacements */ char *String::store_to(char *dest, Untaint_lang lang, SQL_Connection *connection, const char *charset) const { // $MAIN:html-typo table - Table *user_typo_table=static_cast(pool().tag()); - Table *typo_table=user_typo_table?user_typo_table:default_typo_table; + Dictionary *user_typo_dict=static_cast(pool().tag()); + Dictionary *typo_dict=user_typo_dict?user_typo_dict:default_typo_dict; bool whitespace=true; const Chunk *chunk=&head; do { const Chunk::Row *row=chunk->rows; - for(size_t i=0; icount; i++, row++) { + for(uint i=0; icount; i++, row++) { if(row==append_here) goto break2; + Untaint_lang to_lang=lang==UL_UNSPECIFIED?row->item.lang:lang; + + char *dest_before_origins=dest; + + if(forigins_mode) { +#ifndef NO_STRING_ORIGIN + if(row->item.origin.file) + dest+=sprintf(dest, "%s(%d)", + row->item.origin.file, + 1+row->item.origin.line); + else + dest+=sprintf(dest, "unknown"); +#endif + dest+=sprintf(dest, "#%s: ", + String_Untaint_lang_name[to_lang]); + } + char *dest_after_origins=dest; + // WARNING: // string can grow only UNTAINT_TIMES_BIGGER - switch(lang==UL_UNSPECIFIED?row->item.lang:lang) { + switch(to_lang) { case UL_CLEAN: // clean piece { // optimizing whitespace const char *src=row->item.ptr; for(int size=row->item.size; size--; src++) switch(*src) { - case ' ': case '\n': case '\r': case '\t': + /***case ' ': case '\n': case '\t': if(!whitespace) { *dest++=*src; whitespace=true; } - break; + break;*/ default: whitespace=false; *dest++=*src; @@ -168,7 +225,7 @@ char *String::store_to(char *dest, Untai memcpy(dest, row->item.ptr, row->item.size); dest+=row->item.size; break; - case UL_FILE_NAME: + case UL_FILE_SPEC: // tainted, untaint language: file [name] escape(switch(*src) { case ' ': to_char('_'); break; @@ -183,37 +240,30 @@ char *String::store_to(char *dest, Untai }); break; case UL_HTTP_HEADER: - // tainted, untaint language: http-header - if(need_quote_http_header(row->item.ptr, row->item.size)) { - *dest++='\"'; - escape(switch(*src) { - case '\"': to_string("\\\"", 2); break; - _default; - }); - *dest++='\"'; - } else { - memcpy(dest, row->item.ptr, row->item.size); - dest+=row->item.size; - } + // tainted, untaint language: http-field-content-text + escape(switch(*src) { + case ' ': to_char('+'); break; + encode(need_uri_encode, '%'); + }); break; case UL_MAIL_HEADER: // tainted, untaint language: mail-header if(charset) { // Subject: Re: parser3: =?koi8-r?Q?=D3=C5=CD=C9=CE=C1=D2?= const char *src=row->item.ptr; - bool to_base_64=false; + bool to_quoted_printable=false; for(int size=row->item.size; size--; src++) { if(*src & 0x80) { - if(!to_base_64) { + if(!to_quoted_printable) { dest+=sprintf(dest, "=?%.15s?Q?", charset); - to_base_64=true; + to_quoted_printable=true; } dest+=sprintf(dest, "=%02X", *src & 0xFF); } else { *dest++=*src; } } - if(to_base_64) // close + if(to_quoted_printable) // close dest+=sprintf(dest, "?="); } else { memcpy(dest, row->item.ptr, row->item.size); @@ -233,7 +283,7 @@ char *String::store_to(char *dest, Untai if(connection) dest+=connection->quote(dest, row->item.ptr, row->item.size); else - THROW(0, 0, + throw Exception(0, 0, this, "untaint in SQL language failed - no connection specified"); break; @@ -247,19 +297,34 @@ char *String::store_to(char *dest, Untai _default; }); break; + case UL_XML: + escape(switch(*src) { + case '&': to_string("&", 5); break; + case '>': to_string(">", 4); break; + case '<': to_string("<", 4); break; + case '"': to_string(""", 6); break; + case '\'': to_string("'", 6); break; + _default; + }); + break; case UL_HTML: escape(switch(*src) { case '&': to_string("&", 5); break; case '>': to_string(">", 4); break; case '<': to_string("<", 4); break; case '"': to_string(""", 6); break; - //TODO: XSLT case '\'': to_string("'", 6); break; _default; }); break; case UL_USER_HTML: { // tainted, untaint language: html-typo - char *html_for_typo=(char *)malloc(size()*2/* '\n' -> '\' 'n' */+1); + if(!typo_dict) // never, always has default + throw Exception(0, 0, + this, + "untaint to user-html lang failed, no typo table"); + + char *html_for_typo= + (char *)malloc(row->item.size*2/* '\n' -> '\' 'n' */+1,16); // note: // there still is a possibility that user // would not replace \n as she supposed to @@ -271,19 +336,9 @@ char *String::store_to(char *dest, Untai char *dest=html_for_typo; escape(switch(*src) { // convinient name for typo match "\n" - case '\r': - if(typo_table) { - *dest++='\\'; *dest++='n'; // \r -> \n - if(src[1]=='\n') { // \r\n -> remove \n - size--; src++; - } - } - break; case '\n': - if(typo_table) - to_string("\\n", 2); + to_string("\\n", 2); break; - //TODO: XSLT case '\'': to_string("'", 6); break; _default; }); *dest=0; @@ -293,34 +348,28 @@ char *String::store_to(char *dest, Untai const char *src=html_for_typo; do { // there is a row where first column starts 'src' - if(Table::Item *item=typo_table->first_that(typo_present, src)) { + if(Table::Item *item=typo_dict->first_that_starts(src)) { // get a=>b values const String& a=*static_cast(item)->get_string(0); const String& b=*static_cast(item)->get_string(1); - // empty 'a' | 'b' checks - if(a.size()==0 || b.size()==0) { - pool().set_tag(default_typo_table); // avoid recursion - THROW(0, 0, - typo_table->origin_string(), - "typo table column elements must not be empty"); - } // overflow check: // b allowed to be max UNTAINT_TIMES_BIGGER then a if(b.size()>UNTAINT_TIMES_BIGGER*a.size()) { - pool().set_tag(default_typo_table); // avoid recursion - THROW(0, 0, + pool().set_tag(0); // avoid recursion + throw Exception(0, 0, &b, "is %g times longer then '%s', " "while maximum, handled by Parser, is %d", - ((double)b.size())/a.size(), - a.cstr(), - UNTAINT_TIMES_BIGGER); + ((double)b.size())/a.size(), + a.cstr(), + UNTAINT_TIMES_BIGGER); } // skip 'a' in 'src' src+=a.size(); // write 'b' to 'dest' b.store_to(dest); + // skip 'b' in 'dest' dest+=b.size(); } else *dest++=*src++; @@ -328,18 +377,29 @@ char *String::store_to(char *dest, Untai break; } default: - THROW(0, 0, + throw Exception(0, 0, this, "unknown untaint language #%d of %d piece", static_cast(row->item.lang), i); // never + break; // never } if((lang==UL_UNSPECIFIED?row->item.lang:lang)!=UL_CLEAN) whitespace=false; + + if(forigins_mode) + if(dest==dest_after_origins) // never moved==optimized space + dest=dest_before_origins; + else { + remove_crlf(dest_after_origins, dest); + + to_char('\n'); + } } chunk=row->link; } while(chunk); + break2: return dest; }