This is a live mirror of the Perl 5 development currently hosted at https://github.com/perl/perl5
Update ExtUtils-MakeMaker to CPAN version 6.84
[perl5.git] / taint.c
CommitLineData
d6376244
JH
1/* taint.c
2 *
663f364b 3 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
1129b882 4 * 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
d6376244
JH
5 *
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.
8 *
9 */
10
a0d0e21e 11/*
4ac71550
TC
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
cdad3b53 14 * liar, Saruman, and a corrupter of men's hearts.' --Théoden
4ac71550
TC
15 *
16 * [p.580 of _The Lord of the Rings_, III/x: "The Voice of Saruman"]
a0d0e21e
LW
17 */
18
166f8a29
DM
19/* This file contains a few functions for handling data tainting in Perl
20 */
21
463ee0b2 22#include "EXTERN.h"
864dbfa3 23#define PERL_IN_TAINT_C
463ee0b2
LW
24#include "perl.h"
25
26void
e1c41806 27Perl_taint_proper(pTHX_ const char *f, const char *const s)
79072805 28{
26e623cf 29#if defined(HAS_SETEUID) && defined(DEBUGGING)
97aff369 30 dVAR;
7918f24d
NC
31
32 PERL_ARGS_ASSERT_TAINT_PROPER;
33
26e623cf 34 {
dfff4baf
BF
35 const Uid_t uid = PerlProc_getuid();
36 const Uid_t euid = PerlProc_geteuid();
26e623cf 37
8772537c 38 DEBUG_u(PerlIO_printf(Perl_debug_log,
dfff4baf 39 "%s %d %"Uid_t_f" %"Uid_t_f"\n",
284167a5 40 s, TAINT_get, uid, euid));
26e623cf 41 }
a52cb5f7 42#endif
1e422769 43
284167a5 44 if (TAINT_get) {
8772537c
AL
45 const char *ug;
46
22c35a8c
GS
47 if (!f)
48 f = PL_no_security;
985213f2 49 if (PerlProc_getuid() != PerlProc_geteuid())
bbce6d69 50 ug = " while running setuid";
985213f2 51 else if (PerlProc_getgid() != PerlProc_getegid())
bbce6d69 52 ug = " while running setgid";
284167a5 53 else if (TAINT_WARN_get)
6537fe72
MS
54 ug = " while running with -t switch";
55 else
bbce6d69 56 ug = " while running with -T switch";
5d37acd6
DM
57
58 GCC_DIAG_IGNORE(-Wformat-nonliteral); /* fmt checked by caller */
284167a5 59 if (PL_unsafe || TAINT_WARN_get) {
9b387841 60 Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug);
6537fe72
MS
61 }
62 else {
63 Perl_croak(aTHX_ f, s, ug);
64 }
5d37acd6
DM
65 GCC_DIAG_RESTORE;
66
79072805
LW
67 }
68}
69
70void
864dbfa3 71Perl_taint_env(pTHX)
79072805 72{
97aff369 73 dVAR;
79072805 74 SV** svp;
7bac28a0 75 MAGIC* mg;
27da23d5
JH
76 const char* const *e;
77 static const char* const misc_env[] = {
7bac28a0 78 "IFS", /* most shells' inter-field separators */
c90c0ff4
PP
79 "CDPATH", /* ksh dain bramage #1 */
80 "ENV", /* ksh dain bramage #2 */
81 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
e62a6770
RGS
82#ifdef WIN32
83 "PERL5SHELL", /* used for system() on Windows */
84#endif
7bac28a0
PP
85 NULL
86 };
1e422769 87
c038024b
RGS
88 /* Don't bother if there's no *ENV glob */
89 if (!PL_envgv)
142393a6 90 return;
284167a5 91 /* If there's no %ENV hash or if it's not magical, croak, because
c038024b
RGS
92 * it probably doesn't reflect the actual environment */
93 if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
daba3364 94 && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) {
284167a5 95 const bool was_tainted = TAINT_get;
8772537c 96 const char * const name = GvENAME(PL_envgv);
284167a5 97 TAINT;
c038024b
RGS
98 if (strEQ(name,"ENV"))
99 /* hash alias */
100 taint_proper("%%ENV is aliased to %s%s", "another variable");
101 else
102 /* glob alias: report it in the error message */
103 taint_proper("%%ENV is aliased to %%%s%s", name);
104 /* this statement is reached under -t or -U */
284167a5 105 TAINT_set(was_tainted);
9a9b5ec9
DM
106#ifdef NO_TAINT_SUPPORT
107 PERL_UNUSED_VAR(was_tainted);
108#endif
c038024b 109 }
142393a6 110
1e422769 111#ifdef VMS
82f1aded 112 {
1e422769 113 int i = 0;
0dc443ab 114 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
86c11942 115 STRLEN len = 8; /* strlen(name) */
1e422769
PP
116
117 while (1) {
118 if (i)
86c11942
NC
119 len = my_sprintf(name,"DCL$PATH;%d", i);
120 svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
6b88bc9c 121 if (!svp || *svp == &PL_sv_undef)
1e422769
PP
122 break;
123 if (SvTAINTED(*svp)) {
124 TAINT;
125 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
126 }
c038024b 127 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
1e422769
PP
128 TAINT;
129 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
130 }
131 i++;
132 }
82f1aded 133 }
1e422769 134#endif /* VMS */
79072805 135
a4fc7abc 136 svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE);
1e422769
PP
137 if (svp && *svp) {
138 if (SvTAINTED(*svp)) {
139 TAINT;
bbce6d69 140 taint_proper("Insecure %s%s", "$ENV{PATH}");
1e422769 141 }
c038024b 142 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
1e422769
PP
143 TAINT;
144 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
145 }
79072805 146 }
79072805 147
c90c0ff4
PP
148#ifndef VMS
149 /* tainted $TERM is okay if it contains no metachars */
a4fc7abc 150 svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE);
c90c0ff4 151 if (svp && *svp && SvTAINTED(*svp)) {
8b6b16e7 152 STRLEN len;
284167a5 153 const bool was_tainted = TAINT_get;
cfd0369c 154 const char *t = SvPV_const(*svp, len);
8772537c 155 const char * const e = t + len;
9a9b5ec9 156
284167a5 157 TAINT_set(was_tainted);
9a9b5ec9
DM
158#ifdef NO_TAINT_SUPPORT
159 PERL_UNUSED_VAR(was_tainted);
160#endif
0eb30aeb 161 if (t < e && isWORDCHAR(*t))
c90c0ff4 162 t++;
0eb30aeb 163 while (t < e && (isWORDCHAR(*t) || strchr("-_.+", *t)))
c90c0ff4
PP
164 t++;
165 if (t < e) {
166 TAINT;
167 taint_proper("Insecure $ENV{%s}%s", "TERM");
168 }
169 }
170#endif /* !VMS */
171
7bac28a0 172 for (e = misc_env; *e; e++) {
0bd48802 173 SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
3280af22 174 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
7bac28a0
PP
175 TAINT;
176 taint_proper("Insecure $ENV{%s}%s", *e);
177 }
bbce6d69
PP
178 }
179}
66610fdd
RGS
180
181/*
182 * Local variables:
183 * c-indentation-style: bsd
184 * c-basic-offset: 4
14d04a33 185 * indent-tabs-mode: nil
66610fdd
RGS
186 * End:
187 *
14d04a33 188 * ex: set ts=8 sts=4 sw=4 et:
37442d52 189 */