mirror of
git://git.code.sf.net/p/cdesktopenv/code
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113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/***********************************************************************
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* *
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* This software is part of the ast package *
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* Copyright (c) 1985-2011 AT&T Intellectual Property *
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* and is licensed under the *
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* Eclipse Public License, Version 1.0 *
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* by AT&T Intellectual Property *
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* *
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* A copy of the License is available at *
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* http://www.eclipse.org/org/documents/epl-v10.html *
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* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
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* *
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* Information and Software Systems Research *
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* AT&T Research *
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* Florham Park NJ *
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* *
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* Glenn Fowler <gsf@research.att.com> *
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* David Korn <dgk@research.att.com> *
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* Phong Vo <kpv@research.att.com> *
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* *
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***********************************************************************/
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#pragma prototyped
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/*
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* G. S. Fowler
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* D. G. Korn
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* AT&T Bell Laboratories
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*
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* shell library support
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*/
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#include <ast.h>
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#include <sys/stat.h>
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/*
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* return pointer to the full path name of the shell
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*
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* SHELL is read from the environment and must start with /
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*
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* if set-uid or set-gid then the executable and its containing
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* directory must not be owned by the real user/group
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*
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* root/administrator has its own test
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*
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* astconf("SH",NiL,NiL) is returned by default
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*
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* NOTE: csh is rejected because the bsh/csh differentiation is
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* not done for `csh script arg ...'
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*/
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char*
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pathshell(void)
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{
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register char* sh;
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int ru;
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int eu;
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int rg;
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int eg;
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struct stat st;
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static char* val;
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if ((sh = getenv("SHELL")) && *sh == '/' && strmatch(sh, "*/(sh|*[!cC]sh)*([[:digit:]])?(-+([.[:alnum:]]))?(.exe)"))
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{
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if (!(ru = getuid()) || !eaccess("/bin", W_OK))
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{
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if (stat(sh, &st))
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goto defshell;
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if (ru != st.st_uid && !strmatch(sh, "?(/usr)?(/local)/?([ls])bin/?([[:lower:]])sh?(.exe)"))
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goto defshell;
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}
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else
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{
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eu = geteuid();
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rg = getgid();
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eg = getegid();
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if (ru != eu || rg != eg)
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{
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char* s;
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char dir[PATH_MAX];
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s = sh;
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for (;;)
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{
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if (stat(s, &st))
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goto defshell;
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if (ru != eu && st.st_uid == ru)
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goto defshell;
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if (rg != eg && st.st_gid == rg)
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goto defshell;
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if (s != sh)
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break;
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if (strlen(s) >= sizeof(dir))
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goto defshell;
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strcpy(dir, s);
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if (!(s = strrchr(dir, '/')))
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break;
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*s = 0;
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s = dir;
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}
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}
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}
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return sh;
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}
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defshell:
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if (!(sh = val))
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{
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if (!*(sh = astconf("SH", NiL, NiL)) || *sh != '/' || eaccess(sh, X_OK) || !(sh = strdup(sh)))
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sh = "/bin/sh";
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val = sh;
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}
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return sh;
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}
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