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Recode all the old variable-like substitutions with the generic line
[perl5.git] / taint.c
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1/* taint.c
2 *
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3 * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
4 * 2002, 2003, 2004, 2005, 2006, 2007, 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
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11/*
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." --Theoden
15 */
16
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17/* This file contains a few functions for handling data tainting in Perl
18 */
19
463ee0b2 20#include "EXTERN.h"
864dbfa3 21#define PERL_IN_TAINT_C
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22#include "perl.h"
23
24void
dff6d3cd 25Perl_taint_proper(pTHX_ const char *f, const char *s)
79072805 26{
26e623cf 27#if defined(HAS_SETEUID) && defined(DEBUGGING)
97aff369 28 dVAR;
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29# if Uid_t_size == 1
30 {
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31 const UV uid = PL_uid;
32 const UV euid = PL_euid;
26e623cf 33
8772537c 34 DEBUG_u(PerlIO_printf(Perl_debug_log,
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35 "%s %d %"UVuf" %"UVuf"\n",
36 s, PL_tainted, uid, euid));
37 }
38# else
39 {
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40 const IV uid = PL_uid;
41 const IV euid = PL_euid;
26e623cf 42
8772537c 43 DEBUG_u(PerlIO_printf(Perl_debug_log,
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44 "%s %d %"IVdf" %"IVdf"\n",
45 s, PL_tainted, uid, euid));
46 }
47# endif
a52cb5f7 48#endif
1e422769 49
3280af22 50 if (PL_tainted) {
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51 const char *ug;
52
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53 if (!f)
54 f = PL_no_security;
3280af22 55 if (PL_euid != PL_uid)
bbce6d69 56 ug = " while running setuid";
3280af22 57 else if (PL_egid != PL_gid)
bbce6d69 58 ug = " while running setgid";
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59 else if (PL_taint_warn)
60 ug = " while running with -t switch";
61 else
bbce6d69 62 ug = " while running with -T switch";
6537fe72 63 if (PL_unsafe || PL_taint_warn) {
b7bf404b 64 if(ckWARN_d(WARN_TAINT))
9014280d 65 Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug);
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66 }
67 else {
68 Perl_croak(aTHX_ f, s, ug);
69 }
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70 }
71}
72
73void
864dbfa3 74Perl_taint_env(pTHX)
79072805 75{
97aff369 76 dVAR;
79072805 77 SV** svp;
7bac28a0 78 MAGIC* mg;
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79 const char* const *e;
80 static const char* const misc_env[] = {
7bac28a0 81 "IFS", /* most shells' inter-field separators */
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82 "CDPATH", /* ksh dain bramage #1 */
83 "ENV", /* ksh dain bramage #2 */
84 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
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85#ifdef WIN32
86 "PERL5SHELL", /* used for system() on Windows */
87#endif
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88 NULL
89 };
1e422769 90
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91 /* Don't bother if there's no *ENV glob */
92 if (!PL_envgv)
142393a6 93 return;
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94 /* If there's no %ENV hash of if it's not magical, croak, because
95 * it probably doesn't reflect the actual environment */
96 if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
97 && mg_find((SV*)GvHV(PL_envgv), PERL_MAGIC_env))) {
e1ec3a88 98 const bool was_tainted = PL_tainted;
8772537c 99 const char * const name = GvENAME(PL_envgv);
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100 PL_tainted = TRUE;
101 if (strEQ(name,"ENV"))
102 /* hash alias */
103 taint_proper("%%ENV is aliased to %s%s", "another variable");
104 else
105 /* glob alias: report it in the error message */
106 taint_proper("%%ENV is aliased to %%%s%s", name);
107 /* this statement is reached under -t or -U */
108 PL_tainted = was_tainted;
109 }
142393a6 110
1e422769 111#ifdef VMS
82f1aded 112 {
1e422769 113 int i = 0;
0dc443ab 114 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
86c11942 115 STRLEN len = 8; /* strlen(name) */
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116
117 while (1) {
118 if (i)
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119 len = my_sprintf(name,"DCL$PATH;%d", i);
120 svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
6b88bc9c 121 if (!svp || *svp == &PL_sv_undef)
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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)) {
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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);
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137 if (svp && *svp) {
138 if (SvTAINTED(*svp)) {
139 TAINT;
bbce6d69 140 taint_proper("Insecure %s%s", "$ENV{PATH}");
1e422769 141 }
c038024b 142 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
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143 TAINT;
144 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
145 }
79072805 146 }
79072805 147
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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;
73d840c0 153 const bool was_tainted = PL_tainted;
cfd0369c 154 const char *t = SvPV_const(*svp, len);
8772537c 155 const char * const e = t + len;
3280af22 156 PL_tainted = was_tainted;
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157 if (t < e && isALNUM(*t))
158 t++;
d085cc71 159 while (t < e && (isALNUM(*t) || strchr("-_.+", *t)))
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160 t++;
161 if (t < e) {
162 TAINT;
163 taint_proper("Insecure $ENV{%s}%s", "TERM");
164 }
165 }
166#endif /* !VMS */
167
7bac28a0 168 for (e = misc_env; *e; e++) {
0bd48802 169 SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
3280af22 170 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
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171 TAINT;
172 taint_proper("Insecure $ENV{%s}%s", *e);
173 }
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174 }
175}
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176
177/*
178 * Local variables:
179 * c-indentation-style: bsd
180 * c-basic-offset: 4
181 * indent-tabs-mode: t
182 * End:
183 *
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184 * ex: set ts=8 sts=4 sw=4 noet:
185 */