3 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 * 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
6 * You may distribute under the terms of either the GNU General Public
7 * License or the Artistic License, as specified in the README file.
12 * '...we will have peace, when you and all your works have perished--and
13 * the works of your dark master to whom you would deliver us. You are a
14 * liar, Saruman, and a corrupter of men's hearts.' --Théoden
16 * [p.580 of _The Lord of the Rings_, III/x: "The Voice of Saruman"]
19 /* This file contains a few functions for handling data tainting in Perl
23 #define PERL_IN_TAINT_C
27 Perl_taint_proper(pTHX_ const char *f, const char *const s)
29 #if defined(HAS_SETEUID) && defined(DEBUGGING)
32 PERL_ARGS_ASSERT_TAINT_PROPER;
35 const Uid_t uid = PerlProc_getuid();
36 const Uid_t euid = PerlProc_geteuid();
38 DEBUG_u(PerlIO_printf(Perl_debug_log,
39 "%s %d %"Uid_t_f" %"Uid_t_f"\n",
40 s, TAINT_get, uid, euid));
49 if (PerlProc_getuid() != PerlProc_geteuid())
50 ug = " while running setuid";
51 else if (PerlProc_getgid() != PerlProc_getegid())
52 ug = " while running setgid";
53 else if (TAINT_WARN_get)
54 ug = " while running with -t switch";
56 ug = " while running with -T switch";
57 if (PL_unsafe || TAINT_WARN_get) {
58 Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug);
61 Perl_croak(aTHX_ f, s, ug);
73 static const char* const misc_env[] = {
74 "IFS", /* most shells' inter-field separators */
75 "CDPATH", /* ksh dain bramage #1 */
76 "ENV", /* ksh dain bramage #2 */
77 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
79 "PERL5SHELL", /* used for system() on Windows */
84 /* Don't bother if there's no *ENV glob */
87 /* If there's no %ENV hash or if it's not magical, croak, because
88 * it probably doesn't reflect the actual environment */
89 if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
90 && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) {
91 const bool was_tainted = TAINT_get;
92 const char * const name = GvENAME(PL_envgv);
94 if (strEQ(name,"ENV"))
96 taint_proper("%%ENV is aliased to %s%s", "another variable");
98 /* glob alias: report it in the error message */
99 taint_proper("%%ENV is aliased to %%%s%s", name);
100 /* this statement is reached under -t or -U */
101 TAINT_set(was_tainted);
102 #ifdef NO_TAINT_SUPPORT
103 PERL_UNUSED_VAR(was_tainted);
110 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
111 STRLEN len = 8; /* strlen(name) */
115 len = my_sprintf(name,"DCL$PATH;%d", i);
116 svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
117 if (!svp || *svp == &PL_sv_undef)
119 if (SvTAINTED(*svp)) {
121 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
123 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
125 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
132 svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE);
134 if (SvTAINTED(*svp)) {
136 taint_proper("Insecure %s%s", "$ENV{PATH}");
138 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
140 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
145 /* tainted $TERM is okay if it contains no metachars */
146 svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE);
147 if (svp && *svp && SvTAINTED(*svp)) {
149 const bool was_tainted = TAINT_get;
150 const char *t = SvPV_const(*svp, len);
151 const char * const e = t + len;
153 TAINT_set(was_tainted);
154 #ifdef NO_TAINT_SUPPORT
155 PERL_UNUSED_VAR(was_tainted);
157 if (t < e && isWORDCHAR(*t))
159 while (t < e && (isWORDCHAR(*t) || strchr("-_.+", *t)))
163 taint_proper("Insecure $ENV{%s}%s", "TERM");
168 for (e = misc_env; *e; e++) {
169 SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
170 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
172 taint_proper("Insecure $ENV{%s}%s", *e);
179 * c-indentation-style: bsd
181 * indent-tabs-mode: nil
184 * ex: set ts=8 sts=4 sw=4 et: