mirror of
git://git.gnupg.org/gnupg.git
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40ca0022a7
-- This is required by newer mingw toolchain versions which demand that winsock2.h is included before windows.h. Now, due to the use of socket definitions in pth.h we need to include winsock2.h also in pth.h, now pth.h is often included after an include of windows.h and thus the compiler spits out a warning. To avoid that we include winsock2.h at all places the compiler complains about.
628 lines
14 KiB
C
628 lines
14 KiB
C
/* exec.c - generic call-a-program code
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* Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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FIXME: We should replace most code in this module by our
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spawn implementation from common/exechelp.c.
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*/
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#include <config.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#ifndef EXEC_TEMPFILE_ONLY
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#include <sys/wait.h>
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#endif
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#ifdef HAVE_DOSISH_SYSTEM
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# ifdef HAVE_WINSOCK2_H
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# include <winsock2.h>
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# endif
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# include <windows.h>
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#endif
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <errno.h>
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#include "gpg.h"
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#include "options.h"
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#include "i18n.h"
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#include "iobuf.h"
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#include "util.h"
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#include "mkdtemp.h" /* From gnulib. */
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#include "membuf.h"
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#include "exec.h"
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#ifdef NO_EXEC
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int
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exec_write(struct exec_info **info,const char *program,
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const char *args_in,const char *name,int writeonly,int binary)
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{
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log_error(_("no remote program execution supported\n"));
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return G10ERR_GENERAL;
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}
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int
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exec_read(struct exec_info *info) { return G10ERR_GENERAL; }
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int
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exec_finish(struct exec_info *info) { return G10ERR_GENERAL; }
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int
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set_exec_path(const char *path) { return G10ERR_GENERAL; }
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#else /* ! NO_EXEC */
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#if defined (_WIN32)
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/* This is a nicer system() for windows that waits for programs to
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return before returning control to the caller. I hate helpful
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computers. */
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static int
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w32_system(const char *command)
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{
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PROCESS_INFORMATION pi;
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STARTUPINFO si;
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char *string;
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/* We must use a copy of the command as CreateProcess modifies this
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argument. */
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string=xstrdup(command);
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memset(&pi,0,sizeof(pi));
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memset(&si,0,sizeof(si));
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si.cb=sizeof(si);
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if(!CreateProcess(NULL,string,NULL,NULL,FALSE,
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DETACHED_PROCESS,
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NULL,NULL,&si,&pi))
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return -1;
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/* Wait for the child to exit */
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WaitForSingleObject(pi.hProcess,INFINITE);
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CloseHandle(pi.hProcess);
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CloseHandle(pi.hThread);
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xfree(string);
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return 0;
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}
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#endif
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/* Replaces current $PATH */
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int
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set_exec_path(const char *path)
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{
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char *p;
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p=xmalloc(5+strlen(path)+1);
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strcpy(p,"PATH=");
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strcat(p,path);
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if(DBG_EXTPROG)
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log_debug("set_exec_path: %s\n",p);
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/* Notice that path is never freed. That is intentional due to the
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way putenv() works. This leaks a few bytes if we call
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set_exec_path multiple times. */
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if(putenv(p)!=0)
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return G10ERR_GENERAL;
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else
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return 0;
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}
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/* Makes a temp directory and filenames */
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static int
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make_tempdir(struct exec_info *info)
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{
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char *tmp=opt.temp_dir,*namein=info->name,*nameout;
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if(!namein)
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namein=info->flags.binary?"tempin" EXTSEP_S "bin":"tempin" EXTSEP_S "txt";
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nameout=info->flags.binary?"tempout" EXTSEP_S "bin":"tempout" EXTSEP_S "txt";
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/* Make up the temp dir and files in case we need them */
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if(tmp==NULL)
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{
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#if defined (_WIN32)
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int err;
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tmp=xmalloc(MAX_PATH+2);
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err=GetTempPath(MAX_PATH+1,tmp);
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if(err==0 || err>MAX_PATH+1)
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strcpy(tmp,"c:\\windows\\temp");
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else
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{
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int len=strlen(tmp);
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/* GetTempPath may return with \ on the end */
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while(len>0 && tmp[len-1]=='\\')
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{
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tmp[len-1]='\0';
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len--;
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}
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}
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#else /* More unixish systems */
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tmp=getenv("TMPDIR");
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if(tmp==NULL)
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{
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tmp=getenv("TMP");
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if(tmp==NULL)
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{
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#ifdef __riscos__
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tmp="<Wimp$ScrapDir>.GnuPG";
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mkdir(tmp,0700); /* Error checks occur later on */
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#else
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tmp="/tmp";
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#endif
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}
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}
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#endif
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}
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info->tempdir=xmalloc(strlen(tmp)+strlen(DIRSEP_S)+10+1);
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sprintf(info->tempdir,"%s" DIRSEP_S "gpg-XXXXXX",tmp);
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#if defined (_WIN32)
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xfree(tmp);
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#endif
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if(mkdtemp(info->tempdir)==NULL)
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log_error(_("can't create directory `%s': %s\n"),
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info->tempdir,strerror(errno));
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else
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{
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info->flags.madedir=1;
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info->tempfile_in=xmalloc(strlen(info->tempdir)+
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strlen(DIRSEP_S)+strlen(namein)+1);
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sprintf(info->tempfile_in,"%s" DIRSEP_S "%s",info->tempdir,namein);
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if(!info->flags.writeonly)
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{
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info->tempfile_out=xmalloc(strlen(info->tempdir)+
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strlen(DIRSEP_S)+strlen(nameout)+1);
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sprintf(info->tempfile_out,"%s" DIRSEP_S "%s",info->tempdir,nameout);
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}
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}
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return info->flags.madedir?0:G10ERR_GENERAL;
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}
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/* Expands %i and %o in the args to the full temp files within the
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temp directory. */
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static int
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expand_args(struct exec_info *info,const char *args_in)
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{
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const char *ch = args_in;
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membuf_t command;
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info->flags.use_temp_files=0;
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info->flags.keep_temp_files=0;
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if(DBG_EXTPROG)
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log_debug("expanding string \"%s\"\n",args_in);
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init_membuf (&command, 100);
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while(*ch!='\0')
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{
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if(*ch=='%')
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{
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char *append=NULL;
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ch++;
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switch(*ch)
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{
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case 'O':
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info->flags.keep_temp_files=1;
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/* fall through */
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case 'o': /* out */
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if(!info->flags.madedir)
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{
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if(make_tempdir(info))
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goto fail;
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}
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append=info->tempfile_out;
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info->flags.use_temp_files=1;
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break;
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case 'I':
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info->flags.keep_temp_files=1;
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/* fall through */
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case 'i': /* in */
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if(!info->flags.madedir)
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{
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if(make_tempdir(info))
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goto fail;
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}
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append=info->tempfile_in;
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info->flags.use_temp_files=1;
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break;
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case '%':
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append="%";
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break;
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}
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if(append)
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put_membuf_str (&command, append);
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}
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else
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put_membuf (&command, ch, 1);
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ch++;
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}
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put_membuf (&command, "", 1); /* Terminate string. */
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info->command = get_membuf (&command, NULL);
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if (!info->command)
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return gpg_error_from_syserror ();
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if(DBG_EXTPROG)
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log_debug("args expanded to \"%s\", use %u, keep %u\n",info->command,
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info->flags.use_temp_files,info->flags.keep_temp_files);
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return 0;
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fail:
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xfree (get_membuf (&command, NULL));
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return G10ERR_GENERAL;
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}
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/* Either handles the tempfile creation, or the fork/exec. If it
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returns ok, then info->tochild is a FILE * that can be written to.
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The rules are: if there are no args, then it's a fork/exec/pipe.
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If there are args, but no tempfiles, then it's a fork/exec/pipe via
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shell -c. If there are tempfiles, then it's a system. */
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int
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exec_write(struct exec_info **info,const char *program,
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const char *args_in,const char *name,int writeonly,int binary)
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{
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int ret=G10ERR_GENERAL;
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if(opt.exec_disable && !opt.no_perm_warn)
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{
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log_info(_("external program calls are disabled due to unsafe "
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"options file permissions\n"));
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return ret;
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}
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#if defined(HAVE_GETUID) && defined(HAVE_GETEUID)
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/* There should be no way to get to this spot while still carrying
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setuid privs. Just in case, bomb out if we are. */
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if ( getuid () != geteuid ())
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BUG ();
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#endif
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if(program==NULL && args_in==NULL)
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BUG();
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*info=xmalloc_clear(sizeof(struct exec_info));
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if(name)
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(*info)->name=xstrdup(name);
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(*info)->flags.binary=binary;
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(*info)->flags.writeonly=writeonly;
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/* Expand the args, if any */
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if(args_in && expand_args(*info,args_in))
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goto fail;
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#ifdef EXEC_TEMPFILE_ONLY
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if(!(*info)->flags.use_temp_files)
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{
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log_error(_("this platform requires temporary files when calling"
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" external programs\n"));
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goto fail;
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}
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#else /* !EXEC_TEMPFILE_ONLY */
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/* If there are no args, or there are args, but no temp files, we
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can use fork/exec/pipe */
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if(args_in==NULL || (*info)->flags.use_temp_files==0)
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{
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int to[2],from[2];
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if(pipe(to)==-1)
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goto fail;
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if(pipe(from)==-1)
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{
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close(to[0]);
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close(to[1]);
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goto fail;
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}
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if(((*info)->child=fork())==-1)
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{
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close(to[0]);
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close(to[1]);
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close(from[0]);
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close(from[1]);
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goto fail;
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}
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if((*info)->child==0)
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{
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char *shell=getenv("SHELL");
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if(shell==NULL)
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shell="/bin/sh";
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/* I'm the child */
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/* If the program isn't going to respond back, they get to
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keep their stdout/stderr */
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if(!(*info)->flags.writeonly)
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{
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/* implied close of STDERR */
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if(dup2(STDOUT_FILENO,STDERR_FILENO)==-1)
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_exit(1);
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/* implied close of STDOUT */
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close(from[0]);
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if(dup2(from[1],STDOUT_FILENO)==-1)
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_exit(1);
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}
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/* implied close of STDIN */
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close(to[1]);
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if(dup2(to[0],STDIN_FILENO)==-1)
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_exit(1);
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if(args_in==NULL)
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{
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if(DBG_EXTPROG)
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log_debug("execlp: %s\n",program);
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execlp(program,program,(void *)NULL);
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}
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else
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{
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if(DBG_EXTPROG)
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log_debug("execlp: %s -c %s\n",shell,(*info)->command);
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execlp(shell,shell,"-c",(*info)->command,(void *)NULL);
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}
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/* If we get this far the exec failed. Clean up and return. */
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if(args_in==NULL)
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log_error(_("unable to execute program `%s': %s\n"),
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program,strerror(errno));
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else
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log_error(_("unable to execute shell `%s': %s\n"),
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shell,strerror(errno));
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/* This mimics the POSIX sh behavior - 127 means "not found"
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from the shell. */
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if(errno==ENOENT)
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_exit(127);
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_exit(1);
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}
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/* I'm the parent */
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close(to[0]);
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(*info)->tochild=fdopen(to[1],binary?"wb":"w");
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if((*info)->tochild==NULL)
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{
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ret = gpg_error_from_syserror ();
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close(to[1]);
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goto fail;
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}
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close(from[1]);
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(*info)->fromchild=iobuf_fdopen(from[0],"r");
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if((*info)->fromchild==NULL)
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{
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ret = gpg_error_from_syserror ();
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close(from[0]);
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goto fail;
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}
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/* fd iobufs are cached?! */
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iobuf_ioctl((*info)->fromchild,3,1,NULL);
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return 0;
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}
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#endif /* !EXEC_TEMPFILE_ONLY */
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if(DBG_EXTPROG)
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log_debug("using temp file `%s'\n",(*info)->tempfile_in);
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/* It's not fork/exec/pipe, so create a temp file */
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if( is_secured_filename ((*info)->tempfile_in) )
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{
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(*info)->tochild = NULL;
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errno = EPERM;
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}
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else
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(*info)->tochild=fopen((*info)->tempfile_in,binary?"wb":"w");
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if((*info)->tochild==NULL)
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{
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ret = gpg_error_from_syserror ();
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log_error(_("can't create `%s': %s\n"),
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(*info)->tempfile_in,strerror(errno));
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goto fail;
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}
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ret=0;
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fail:
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if (ret)
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{
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xfree (*info);
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*info = NULL;
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}
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return ret;
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}
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int
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exec_read(struct exec_info *info)
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{
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int ret=G10ERR_GENERAL;
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fclose(info->tochild);
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info->tochild=NULL;
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if(info->flags.use_temp_files)
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{
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if(DBG_EXTPROG)
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log_debug("system() command is %s\n",info->command);
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#if defined (_WIN32)
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info->progreturn=w32_system(info->command);
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#else
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info->progreturn=system(info->command);
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#endif
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if(info->progreturn==-1)
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{
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log_error(_("system error while calling external program: %s\n"),
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strerror(errno));
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info->progreturn=127;
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goto fail;
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}
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#if defined(WIFEXITED) && defined(WEXITSTATUS)
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if(WIFEXITED(info->progreturn))
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info->progreturn=WEXITSTATUS(info->progreturn);
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else
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{
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log_error(_("unnatural exit of external program\n"));
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info->progreturn=127;
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goto fail;
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}
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#else
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/* If we don't have the macros, do the best we can. */
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info->progreturn = (info->progreturn & 0xff00) >> 8;
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#endif
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/* 127 is the magic value returned from system() to indicate
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that the shell could not be executed, or from /bin/sh to
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indicate that the program could not be executed. */
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if(info->progreturn==127)
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{
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log_error(_("unable to execute external program\n"));
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goto fail;
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}
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if(!info->flags.writeonly)
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{
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info->fromchild=iobuf_open(info->tempfile_out);
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if (info->fromchild
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&& is_secured_file (iobuf_get_fd (info->fromchild)))
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{
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iobuf_close (info->fromchild);
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info->fromchild = NULL;
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errno = EPERM;
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}
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if(info->fromchild==NULL)
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{
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ret = gpg_error_from_syserror ();
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log_error(_("unable to read external program response: %s\n"),
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strerror(errno));
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goto fail;
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}
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/* Do not cache this iobuf on close */
|
|
iobuf_ioctl(info->fromchild,3,1,NULL);
|
|
}
|
|
}
|
|
|
|
ret=0;
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
exec_finish(struct exec_info *info)
|
|
{
|
|
int ret=info->progreturn;
|
|
|
|
if(info->fromchild)
|
|
iobuf_close(info->fromchild);
|
|
|
|
if(info->tochild)
|
|
fclose(info->tochild);
|
|
|
|
#ifndef EXEC_TEMPFILE_ONLY
|
|
if(info->child>0)
|
|
{
|
|
if(waitpid(info->child,&info->progreturn,0)!=0 &&
|
|
WIFEXITED(info->progreturn))
|
|
ret=WEXITSTATUS(info->progreturn);
|
|
else
|
|
{
|
|
log_error(_("unnatural exit of external program\n"));
|
|
ret=127;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if(info->flags.madedir && !info->flags.keep_temp_files)
|
|
{
|
|
if(info->tempfile_in)
|
|
{
|
|
if(unlink(info->tempfile_in)==-1)
|
|
log_info(_("WARNING: unable to remove tempfile (%s) `%s': %s\n"),
|
|
"in",info->tempfile_in,strerror(errno));
|
|
}
|
|
|
|
if(info->tempfile_out)
|
|
{
|
|
if(unlink(info->tempfile_out)==-1)
|
|
log_info(_("WARNING: unable to remove tempfile (%s) `%s': %s\n"),
|
|
"out",info->tempfile_out,strerror(errno));
|
|
}
|
|
|
|
if(rmdir(info->tempdir)==-1)
|
|
log_info(_("WARNING: unable to remove temp directory `%s': %s\n"),
|
|
info->tempdir,strerror(errno));
|
|
}
|
|
|
|
xfree(info->command);
|
|
xfree(info->name);
|
|
xfree(info->tempdir);
|
|
xfree(info->tempfile_in);
|
|
xfree(info->tempfile_out);
|
|
xfree(info);
|
|
|
|
return ret;
|
|
}
|
|
#endif /* ! NO_EXEC */
|