mirror of
git://git.gnupg.org/gnupg.git
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625 lines
14 KiB
C
625 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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#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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#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 "options.h"
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#include "memory.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 "exec.h"
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#ifdef NO_EXEC
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int 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 exec_read(struct exec_info *info) { return G10ERR_GENERAL; }
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int exec_finish(struct exec_info *info) { return G10ERR_GENERAL; }
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int set_exec_path(const char *path) { return G10ERR_GENERAL; }
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#else /* ! NO_EXEC */
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#ifndef HAVE_MKDTEMP
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char *mkdtemp(char *template);
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#endif
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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 win_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,0,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 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 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);
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err=GetTempPath(MAX_PATH,tmp);
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if(err==0 || err>MAX_PATH)
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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 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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unsigned int size,len;
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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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size=100;
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info->command=xmalloc(size);
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len=0;
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info->command[0]='\0';
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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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{
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size_t applen=strlen(append);
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if(applen+len>size-1)
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{
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if(applen<100)
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applen=100;
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size+=applen;
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info->command=xrealloc(info->command,size);
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}
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strcat(info->command,append);
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len+=strlen(append);
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}
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}
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else
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{
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if(len==size-1) /* leave room for the \0 */
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{
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size+=100;
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info->command=xrealloc(info->command,size);
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}
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info->command[len++]=*ch;
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info->command[len]='\0';
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}
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ch++;
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}
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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(info->command);
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info->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 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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close(to[1]);
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ret=G10ERR_WRITE_FILE;
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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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close(from[0]);
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ret=G10ERR_READ_FILE;
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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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log_error(_("can't create `%s': %s\n"),
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(*info)->tempfile_in,strerror(errno));
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ret=G10ERR_WRITE_FILE;
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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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return ret;
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}
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int 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=win_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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log_error(_("unable to read external program response: %s\n"),
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strerror(errno));
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ret=G10ERR_READ_FILE;
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goto fail;
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}
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/* Do not cache this iobuf on close */
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iobuf_ioctl(info->fromchild,3,1,NULL);
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}
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}
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ret=0;
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fail:
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return ret;
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}
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int exec_finish(struct exec_info *info)
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{
|
|
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 */
|