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)
30 PERL_ARGS_ASSERT_TAINT_PROPER;
33 const Uid_t uid = PerlProc_getuid();
34 const Uid_t euid = PerlProc_geteuid();
36 #if Uid_t_sign == 1 /* uid_t is unsigned. */
37 DEBUG_u(PerlIO_printf(Perl_debug_log,
38 "%s %d %"UVuf" %"UVuf"\n",
39 s, TAINT_get, (UV)uid, (UV)euid));
40 #else /* uid_t is signed (Uid_t_sign == -1), or don't know. */
41 DEBUG_u(PerlIO_printf(Perl_debug_log,
42 "%s %d %"IVdf" %"IVdf"\n",
43 s, TAINT_get, (IV)uid, (IV)euid));
53 if (PerlProc_getuid() != PerlProc_geteuid())
54 ug = " while running setuid";
55 else if (PerlProc_getgid() != PerlProc_getegid())
56 ug = " while running setgid";
57 else if (TAINT_WARN_get)
58 ug = " while running with -t switch";
60 ug = " while running with -T switch";
62 /* XXX because taint_proper adds extra format args, we can't
63 * get the caller to check properly; o we just silence the warning
64 * and hope the callers aren't naughty */
65 GCC_DIAG_IGNORE(-Wformat-nonliteral);
66 if (PL_unsafe || TAINT_WARN_get) {
67 Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug);
70 Perl_croak(aTHX_ f, s, ug);
83 static const char* const misc_env[] = {
84 "IFS", /* most shells' inter-field separators */
85 "CDPATH", /* ksh dain bramage #1 */
86 "ENV", /* ksh dain bramage #2 */
87 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
89 "PERL5SHELL", /* used for system() on Windows */
94 /* Don't bother if there's no *ENV glob */
97 /* If there's no %ENV hash or if it's not magical, croak, because
98 * it probably doesn't reflect the actual environment */
99 if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
100 && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) {
101 const bool was_tainted = TAINT_get;
102 const char * const name = GvENAME(PL_envgv);
104 if (strEQ(name,"ENV"))
106 taint_proper("%%ENV is aliased to %s%s", "another variable");
108 /* glob alias: report it in the error message */
109 taint_proper("%%ENV is aliased to %%%s%s", name);
110 /* this statement is reached under -t or -U */
111 TAINT_set(was_tainted);
112 #ifdef NO_TAINT_SUPPORT
113 PERL_UNUSED_VAR(was_tainted);
120 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
121 STRLEN len = 8; /* strlen(name) */
125 len = my_sprintf(name,"DCL$PATH;%d", i);
126 svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
127 if (!svp || *svp == &PL_sv_undef)
129 if (SvTAINTED(*svp)) {
131 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
133 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
135 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
142 svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE);
144 if (SvTAINTED(*svp)) {
146 taint_proper("Insecure %s%s", "$ENV{PATH}");
148 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
150 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
155 /* tainted $TERM is okay if it contains no metachars */
156 svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE);
157 if (svp && *svp && SvTAINTED(*svp)) {
159 const bool was_tainted = TAINT_get;
160 const char *t = SvPV_const(*svp, len);
161 const char * const e = t + len;
163 TAINT_set(was_tainted);
164 #ifdef NO_TAINT_SUPPORT
165 PERL_UNUSED_VAR(was_tainted);
167 if (t < e && isWORDCHAR(*t))
169 while (t < e && (isWORDCHAR(*t) || strchr("-_.+", *t)))
173 taint_proper("Insecure $ENV{%s}%s", "TERM");
178 for (e = misc_env; *e; e++) {
179 SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
180 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
182 taint_proper("Insecure $ENV{%s}%s", *e);
189 * c-indentation-style: bsd
191 * indent-tabs-mode: nil
194 * ex: set ts=8 sts=4 sw=4 et: