--- parser3/src/main/pa_exec.C 2001/10/30 15:08:19 1.16 +++ parser3/src/main/pa_exec.C 2002/04/16 09:38:49 1.35 @@ -1,14 +1,21 @@ /** @file Parser: program executing for different OS-es. - Copyright(c) 2000,2001 ArtLebedev Group(http://www.artlebedev.com) - Author: Alexander Petrosyan (http://design.ru/paf) + Copyright(c) 2000,2001, 2002 ArtLebedev Group(http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) - $Id: pa_exec.C,v 1.16 2001/10/30 15:08:19 paf Exp $ + $Id: pa_exec.C,v 1.35 2002/04/16 09:38:49 paf Exp $ + + + @todo setrlimit */ #include "pa_config_includes.h" +#include "pa_exec.h" +#include "pa_exception.h" +#include "pa_common.h" + #ifdef WIN32 # include #else @@ -17,18 +24,10 @@ # include #endif -#include -#include - -#include "pa_exec.h" -#include "pa_exception.h" -#include "pa_common.h" - - #ifdef WIN32 /// this func from http://www.ccas.ru/~posp/popov/spawn.htm -static BOOL WINAPI CreateHiddenConsoleProcess(LPCTSTR szChildName, +static BOOL WINAPI CreateHiddenConsoleProcess(LPCTSTR szCmdLine, char *szEnv, PROCESS_INFORMATION* ppi, LPHANDLE phInWrite, @@ -71,15 +70,22 @@ static BOOL WINAPI CreateHiddenConsolePr si.hStdOutput=hOutWrite; si.hStdError=hErrWrite; + // calculating script's directory + char dir[MAX_STRING]; + strncpy(dir, szCmdLine, MAX_STRING-1); dir[MAX_STRING-1]=0; + lsplit(dir,' '); // trim arguments + rsplit(dir,'/'); rsplit(dir,'\\'); // trim filename + chdir(dir); + // Create a child process (suspended) fCreated=CreateProcess(NULL, - (LPTSTR)szChildName, + (LPTSTR)szCmdLine, NULL, NULL, TRUE, - 0, //todo CREATE_NO_WINDOW, + CREATE_NO_WINDOW, szEnv, - NULL, + dir, &si, ppi); @@ -100,14 +106,14 @@ error: return FALSE; } -static void read_pipe(String& result, HANDLE hOutRead, const char *file_spec){ +static void read_pipe(String& result, HANDLE hOutRead, const char *file_spec, + String::Untaint_lang lang){ while(true) { char *buf=(char *)result.pool().malloc(MAX_STRING); unsigned long size; - ReadFile(hOutRead, buf, MAX_STRING, &size, NULL); - if(!size) + if(!ReadFile(hOutRead, buf, MAX_STRING, &size, NULL) || !size) break; - result.APPEND_AS_IS(buf, size, file_spec, 0); + result.APPEND(buf, size, lang, file_spec, 0); } } @@ -155,14 +161,9 @@ static const char *buildCommand(Pool& po #else -static int execle_piped(const char *path, - const char *arg1, const char *arg2, - const char *arg3, const char *arg4, - const char *arg5, const char *arg6, - const char *arg7, const char *arg8, - const char *arg9, const char *arg10, - char * const env[], - int *pipe_in, int *pipe_out, int *pipe_err) { +static int execve_piped(const char *file_spec_cstr, + char * const argv[], char * const env[], + int *pipe_in, int *pipe_out, int *pipe_err) { int pid; int in_fds[2]; int out_fds[2]; @@ -235,7 +236,14 @@ static int execle_piped(const char *path /* HP-UX SIGCHLD fix goes here, if someone will remind me what it is... */ signal(SIGCHLD, SIG_DFL); /* Was that it? */ - execle(path, arg1, arg2, arg3, arg4, arg5, NULL, env); + // chdir to script's directory + char dir[MAX_STRING]; + strncpy(dir, file_spec_cstr, MAX_STRING-1); dir[MAX_STRING-1]=0; + rsplit(dir,'/'); // trim filename + chdir(dir); + + // execute + execve(file_spec_cstr, argv, env); exit(-errno); } @@ -267,18 +275,19 @@ static int get_exit_status(int pid) { WEXITSTATUS(status) : -2; } -static void read_pipe(String& result, int file, const char *file_spec){ +static void read_pipe(String& result, int file, const char *file_spec, String::Untaint_lang lang){ while(true) { char *buf=(char *)result.pool().malloc(MAX_STRING); size_t size=read(file, buf, MAX_STRING); - if(!size) + if(!size) break; - result.APPEND_AS_IS(buf, size, file_spec, 0); + result.APPEND(buf, size, lang, file_spec, 0); } } #endif +///@test maybe here and at argv construction --- cstr(String::UL_UNSPECIFIED static void append_env_pair(const Hash::Key& key, Hash::Val *value, void *info) { #ifdef WIN32 String& string=*static_cast(info); @@ -293,18 +302,23 @@ static void append_env_pair(const Hash:: **env_ref=string.cstr(); (*env_ref)++; #endif } -int pa_exec(const String& file_spec, + +int pa_exec( + bool forced_allow, + const String& file_spec, const Hash *env, const Array *argv, const String& in, String& out, String& err) { Pool& pool=file_spec.pool(); -#ifdef WIN32 +#ifdef NO_PA_EXECS + if(!forced_allow) + throw Exception("parser.runtime", + &file_spec, + "parser execs are disabled [recompile parser without --disable-execs configure option]"); +#endif - char pwd[MAX_STRING]; - GetCurrentDirectory(sizeof(pwd), pwd); - char *dir=file_spec.cstr(String::UL_FILE_SPEC); - rsplit(dir, '/'); SetCurrentDirectory(dir); +#ifdef WIN32 PROCESS_INFORMATION pi; HANDLE hInWrite, hOutRead, hErrRead; @@ -317,8 +331,6 @@ int pa_exec(const String& file_spec, env_cstr=string.cstr(); } if(CreateHiddenConsoleProcess(cmd, env_cstr, &pi, &hInWrite, &hOutRead, &hErrRead)) { - SetCurrentDirectory(pwd); - const char *in_cstr=in.cstr(); DWORD written_size; WriteFile(hInWrite, in_cstr, in.size(), &written_size, NULL); @@ -327,9 +339,9 @@ int pa_exec(const String& file_spec, // without this char WriteFile(hInWrite, "\x1A", 1, &written_size, NULL); CloseHandle(hInWrite); - read_pipe(out, hOutRead, file_spec_cstr); + read_pipe(out, hOutRead, file_spec_cstr, String::UL_AS_IS); CloseHandle(hOutRead); - read_pipe(err, hErrRead, file_spec_cstr); + read_pipe(err, hErrRead, file_spec_cstr, String::UL_TAINTED); CloseHandle(hErrRead); /* from http://www.apache.org/websrc/cvsweb.cgi/apache-1.3/src/main/util_script.c?rev=1.151&content-type=text/vnd.viewcvs-markup @@ -340,8 +352,6 @@ from http://www.apache.org/websrc/cvsweb CloseHandle(pi.hProcess); CloseHandle(pi.hThread); } else { - SetCurrentDirectory(pwd); - DWORD error=GetLastError(); char szErrorDesc[MAX_STRING]; FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, error, @@ -351,9 +361,9 @@ from http://www.apache.org/websrc/cvsweb if(error_size>3) // ".\r\n" szErrorDesc[error_size-3]=0; - throw Exception(0, 0, + throw Exception(0, &file_spec, - "(real filename=\"%s\") exec failed - %s (%ld)", + "(real command line=\"%s\") exec failed - %s (%ld)", cmd, szErrorDesc, (long)error); } @@ -361,13 +371,37 @@ from http://www.apache.org/websrc/cvsweb #else int pipe_write, pipe_read, pipe_err; - const char *argv_cstrs[5]={"", "", "", "", ""}; + char *file_spec_cstr=file_spec.cstr(String::UL_FILE_SPEC); + +#ifdef NO_FOREIGN_GROUP_FILES + if(!forced_allow) { + struct stat finfo; + if(stat(file_spec_cstr, &finfo)!=0) + throw Exception("file.missing", + &file_spec, + "stat failed: %s (%d), actual filename '%s'", + strerror(errno), errno, file_spec_cstr); + + if(finfo.st_gid/*foreign?*/!=getegid()) + throw Exception("parser.runtime", + &file_spec, + "parser executing files of foreign group is disabled [recompile parser without --disable-foreign-group-files configure option], actual filename '%s'", + file_spec_cstr); + } +#endif + + char *argv_cstrs[1+10+1]={file_spec_cstr, 0}; if(argv) { - int size=min(5, argv->size()); - for(int i=0; iget_string(i)->cstr(); + const int argv_size=argv->size(); + const int argv_max=sizeof(argv_cstrs)/sizeof(argv_cstrs[0])-1-1; + if(argv_size>argv_max) + throw Exception("parser.runtime", + &file_spec, + "too many arguments (%d > max %d)", argv_size, argv_max); + for(int i=0; iget_string(i)->cstr(); + argv_cstrs[1+argv_size]=0; } - const char *file_spec_cstr=file_spec.cstr(String::UL_FILE_SPEC); char **env_cstrs=0; if(env) { env_cstrs= @@ -376,24 +410,24 @@ from http://www.apache.org/websrc/cvsweb env->for_each(append_env_pair, &env_ref); *env_ref=0; } - if(int pid=execle_piped( - file_spec_cstr, - argv_cstrs[0], argv_cstrs[1], argv_cstrs[2], argv_cstrs[3], argv_cstrs[4], - argv_cstrs[5], argv_cstrs[6], argv_cstrs[7], argv_cstrs[8], argv_cstrs[9], - env_cstrs, - &pipe_write, &pipe_read, &pipe_err)) { + int pid=execve_piped( + file_spec_cstr, + argv_cstrs, env_cstrs, + &pipe_write, &pipe_read, &pipe_err); + if(pid) { + // in child const char *in_cstr=in.cstr(); write(pipe_write, in_cstr, in.size()); close(pipe_write); - read_pipe(out, pipe_read, file_spec_cstr); + read_pipe(out, pipe_read, file_spec_cstr, String::UL_AS_IS); close(pipe_read); - read_pipe(err, pipe_err, file_spec_cstr); + read_pipe(err, pipe_err, file_spec_cstr, String::UL_TAINTED); close(pipe_err); return get_exit_status(pid); // negative may mean "-errno[execl()]" } else - throw Exception(0, 0, + throw Exception(0, &file_spec, "pipe error"); #endif