da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/***********************************************************************
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* This software is part of the ast package *
3e14f97f673e8a630f076077de35afdd43dc1587Roger A. Faulkner* Copyright (c) 1985-2010 AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* and is licensed under the *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Common Public License, Version 1.0 *
7c2fbfb345896881c631598ee3852ce9ce33fb07April Chin* by AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* A copy of the License is available at *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* http://www.opensource.org/licenses/cpl1.0.txt *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Information and Software Systems Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* AT&T Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Florham Park NJ *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Glenn Fowler <gsf@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* David Korn <dgk@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Phong Vo <kpv@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin***********************************************************************/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#pragma prototyped
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/*
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * access() euid/egid implementation
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <ast.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <errno.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include <ls.h>
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#include "FEATURE/eaccess"
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_eaccess
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinNoN(eaccess)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if defined(__EXPORT__)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#define extern __EXPORT__
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinextern int
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chineaccess(const char* path, register int flags)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin{
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#ifdef EFF_ONLY_OK
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return access(path, flags|EFF_ONLY_OK);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_euidaccess
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return euidaccess(path, flags);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register int mode;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin struct stat st;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static int init;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static uid_t ruid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static uid_t euid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static gid_t rgid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static gid_t egid;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!init)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ruid = getuid();
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin euid = geteuid();
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin rgid = getgid();
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin egid = getegid();
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin init = (ruid == euid && rgid == egid) ? 1 : -1;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (init > 0 || flags == F_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return access(path, flags);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (stat(path, &st))
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return -1;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode = 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (euid == 0)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!S_ISREG(st.st_mode) || !(flags & X_OK) || (st.st_mode & (S_IXUSR|S_IXGRP|S_IXOTH)))
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin goto nope;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else if (euid == st.st_uid)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & R_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IRUSR;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & W_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IWUSR;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & X_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IXUSR;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else if (egid == st.st_gid)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_getgroups
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin setgroup:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & R_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IRGRP;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & W_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IWGRP;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & X_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IXGRP;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if _lib_getgroups
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register int n;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static int ngroups = -2;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin static gid_t* groups;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (ngroups == -2)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin {
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if ((ngroups = getgroups(0, (gid_t*)0)) <= 0)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ngroups = NGROUPS_MAX;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (!(groups = newof(0, gid_t, ngroups + 1, 0)))
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ngroups = -1;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin ngroups = getgroups(ngroups, groups);
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin n = ngroups;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin while (--n >= 0)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (groups[n] == st.st_gid)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin goto setgroup;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & R_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IROTH;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & W_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IWOTH;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (flags & X_OK)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin mode |= S_IXOTH;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin }
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if ((st.st_mode & mode) == mode)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin nope:
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin errno = EACCES;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return -1;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin}
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#endif