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 #if Uid_t_sign == 1 /* uid_t is unsigned. */
39 DEBUG_u(PerlIO_printf(Perl_debug_log,
40 "%s %d %"UVuf" %"UVuf"\n",
41 s, TAINT_get, (UV)uid, (UV)euid));
42 #else /* uid_t is signed (Uid_t_sign == -1), or don't know. */
43 DEBUG_u(PerlIO_printf(Perl_debug_log,
44 "%s %d %"IVdf" %"IVdf"\n",
45 s, TAINT_get, (IV)uid, (IV)euid));
55 if (PerlProc_getuid() != PerlProc_geteuid())
56 ug = " while running setuid";
57 else if (PerlProc_getgid() != PerlProc_getegid())
58 ug = " while running setgid";
59 else if (TAINT_WARN_get)
60 ug = " while running with -t switch";
62 ug = " while running with -T switch";
64 /* XXX because taint_proper adds extra format args, we can't
65 * get the caller to check properly; o we just silence the warning
66 * and hope the callers aren't naughty */
67 GCC_DIAG_IGNORE(-Wformat-nonliteral);
68 if (PL_unsafe || TAINT_WARN_get) {
69 Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug);
72 Perl_croak(aTHX_ f, s, ug);
86 static const char* const misc_env[] = {
87 "IFS", /* most shells' inter-field separators */
88 "CDPATH", /* ksh dain bramage #1 */
89 "ENV", /* ksh dain bramage #2 */
90 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
92 "PERL5SHELL", /* used for system() on Windows */
97 /* Don't bother if there's no *ENV glob */
100 /* If there's no %ENV hash or if it's not magical, croak, because
101 * it probably doesn't reflect the actual environment */
102 if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
103 && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) {
104 const bool was_tainted = TAINT_get;
105 const char * const name = GvENAME(PL_envgv);
107 if (strEQ(name,"ENV"))
109 taint_proper("%%ENV is aliased to %s%s", "another variable");
111 /* glob alias: report it in the error message */
112 taint_proper("%%ENV is aliased to %%%s%s", name);
113 /* this statement is reached under -t or -U */
114 TAINT_set(was_tainted);
115 #ifdef NO_TAINT_SUPPORT
116 PERL_UNUSED_VAR(was_tainted);
123 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
124 STRLEN len = 8; /* strlen(name) */
128 len = my_sprintf(name,"DCL$PATH;%d", i);
129 svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
130 if (!svp || *svp == &PL_sv_undef)
132 if (SvTAINTED(*svp)) {
134 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
136 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
138 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
145 svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE);
147 if (SvTAINTED(*svp)) {
149 taint_proper("Insecure %s%s", "$ENV{PATH}");
151 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
153 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
158 /* tainted $TERM is okay if it contains no metachars */
159 svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE);
160 if (svp && *svp && SvTAINTED(*svp)) {
162 const bool was_tainted = TAINT_get;
163 const char *t = SvPV_const(*svp, len);
164 const char * const e = t + len;
166 TAINT_set(was_tainted);
167 #ifdef NO_TAINT_SUPPORT
168 PERL_UNUSED_VAR(was_tainted);
170 if (t < e && isWORDCHAR(*t))
172 while (t < e && (isWORDCHAR(*t) || strchr("-_.+", *t)))
176 taint_proper("Insecure $ENV{%s}%s", "TERM");
181 for (e = misc_env; *e; e++) {
182 SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
183 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
185 taint_proper("Insecure $ENV{%s}%s", *e);
192 * c-indentation-style: bsd
194 * indent-tabs-mode: nil
197 * ex: set ts=8 sts=4 sw=4 et: