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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
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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/*
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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
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15 *
16 * [p.580 of _The Lord of the Rings_, III/x: "The Voice of Saruman"]
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17 */
18
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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
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24#include "perl.h"
25
26void
e1c41806 27Perl_taint_proper(pTHX_ const char *f, const char *const s)
79072805 28{
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29 /* Output a tainting violation, croaking unless we're just to warn.
30 * '_proper' is just to throw you off the scent */
31
26e623cf 32#if defined(HAS_SETEUID) && defined(DEBUGGING)
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33 PERL_ARGS_ASSERT_TAINT_PROPER;
34
26e623cf 35 {
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36 const Uid_t uid = PerlProc_getuid();
37 const Uid_t euid = PerlProc_geteuid();
26e623cf 38
8b225b9c 39#if Uid_t_sign == 1 /* uid_t is unsigned. */
8772537c 40 DEBUG_u(PerlIO_printf(Perl_debug_log,
147e3846 41 "%s %d %" UVuf " %" UVuf "\n",
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42 s, TAINT_get, (UV)uid, (UV)euid));
43#else /* uid_t is signed (Uid_t_sign == -1), or don't know. */
44 DEBUG_u(PerlIO_printf(Perl_debug_log,
147e3846 45 "%s %d %" IVdf " %" IVdf "\n",
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46 s, TAINT_get, (IV)uid, (IV)euid));
47#endif
26e623cf 48 }
a52cb5f7 49#endif
1e422769 50
284167a5 51 if (TAINT_get) {
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52 const char *ug;
53
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54 if (!f)
55 f = PL_no_security;
985213f2 56 if (PerlProc_getuid() != PerlProc_geteuid())
bbce6d69 57 ug = " while running setuid";
985213f2 58 else if (PerlProc_getgid() != PerlProc_getegid())
bbce6d69 59 ug = " while running setgid";
284167a5 60 else if (TAINT_WARN_get)
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61 ug = " while running with -t switch";
62 else
bbce6d69 63 ug = " while running with -T switch";
5d37acd6 64
6fd06953 65 /* XXX because taint_proper adds extra format args, we can't
bc2f1ca1 66 * get the caller to check properly; so we just silence the warning
6fd06953 67 * and hope the callers aren't naughty */
7347ee54 68 GCC_DIAG_IGNORE_STMT(-Wformat-nonliteral);
284167a5 69 if (PL_unsafe || TAINT_WARN_get) {
9b387841 70 Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug);
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71 }
72 else {
73 Perl_croak(aTHX_ f, s, ug);
74 }
7347ee54 75 GCC_DIAG_RESTORE_STMT;
5d37acd6 76
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77 }
78}
79
80void
864dbfa3 81Perl_taint_env(pTHX)
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82{
83 SV** svp;
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84 const char* const *e;
85 static const char* const misc_env[] = {
7bac28a0 86 "IFS", /* most shells' inter-field separators */
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87 "CDPATH", /* ksh dain bramage #1 */
88 "ENV", /* ksh dain bramage #2 */
89 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
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90#ifdef WIN32
91 "PERL5SHELL", /* used for system() on Windows */
92#endif
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93 NULL
94 };
1e422769 95
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96 /* Don't bother if there's no *ENV glob */
97 if (!PL_envgv)
142393a6 98 return;
284167a5 99 /* If there's no %ENV hash or if it's not magical, croak, because
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100 * it probably doesn't reflect the actual environment */
101 if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
daba3364 102 && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) {
284167a5 103 const bool was_tainted = TAINT_get;
8772537c 104 const char * const name = GvENAME(PL_envgv);
284167a5 105 TAINT;
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106 if (strEQ(name,"ENV"))
107 /* hash alias */
108 taint_proper("%%ENV is aliased to %s%s", "another variable");
109 else
110 /* glob alias: report it in the error message */
111 taint_proper("%%ENV is aliased to %%%s%s", name);
112 /* this statement is reached under -t or -U */
284167a5 113 TAINT_set(was_tainted);
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114#ifdef NO_TAINT_SUPPORT
115 PERL_UNUSED_VAR(was_tainted);
116#endif
c038024b 117 }
142393a6 118
1e422769 119#ifdef VMS
82f1aded 120 {
1e422769 121 int i = 0;
0dc443ab 122 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
86c11942 123 STRLEN len = 8; /* strlen(name) */
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124
125 while (1) {
19742f39 126 MAGIC* mg;
1e422769 127 if (i)
03f39617 128 len = my_snprintf(name, sizeof name, "DCL$PATH;%d", i);
86c11942 129 svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
6b88bc9c 130 if (!svp || *svp == &PL_sv_undef)
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131 break;
132 if (SvTAINTED(*svp)) {
133 TAINT;
134 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
135 }
c038024b 136 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
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137 TAINT;
138 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
139 }
140 i++;
141 }
82f1aded 142 }
1e422769 143#endif /* VMS */
79072805 144
a4fc7abc 145 svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE);
1e422769 146 if (svp && *svp) {
19742f39 147 MAGIC* mg;
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148 if (SvTAINTED(*svp)) {
149 TAINT;
bbce6d69 150 taint_proper("Insecure %s%s", "$ENV{PATH}");
1e422769 151 }
c038024b 152 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
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153 TAINT;
154 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
155 }
79072805 156 }
79072805 157
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158#ifndef VMS
159 /* tainted $TERM is okay if it contains no metachars */
a4fc7abc 160 svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE);
c90c0ff4 161 if (svp && *svp && SvTAINTED(*svp)) {
8b6b16e7 162 STRLEN len;
284167a5 163 const bool was_tainted = TAINT_get;
cfd0369c 164 const char *t = SvPV_const(*svp, len);
8772537c 165 const char * const e = t + len;
9a9b5ec9 166
284167a5 167 TAINT_set(was_tainted);
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168#ifdef NO_TAINT_SUPPORT
169 PERL_UNUSED_VAR(was_tainted);
170#endif
0eb30aeb 171 if (t < e && isWORDCHAR(*t))
c90c0ff4 172 t++;
4aada8b9 173 while (t < e && (isWORDCHAR(*t) || memCHRs("-_.+", *t)))
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174 t++;
175 if (t < e) {
176 TAINT;
177 taint_proper("Insecure $ENV{%s}%s", "TERM");
178 }
179 }
180#endif /* !VMS */
181
7bac28a0 182 for (e = misc_env; *e; e++) {
0bd48802 183 SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
3280af22 184 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
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185 TAINT;
186 taint_proper("Insecure $ENV{%s}%s", *e);
187 }
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188 }
189}
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190
191/*
14d04a33 192 * ex: set ts=8 sts=4 sw=4 et:
37442d52 193 */