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[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,
4 * 2000, 2001, 2002, 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
463ee0b2 17#include "EXTERN.h"
864dbfa3 18#define PERL_IN_TAINT_C
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19#include "perl.h"
20
21void
dff6d3cd 22Perl_taint_proper(pTHX_ const char *f, const char *s)
79072805 23{
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24 char *ug;
25
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26#if defined(HAS_SETEUID) && defined(DEBUGGING)
27# if Uid_t_size == 1
28 {
29 UV uid = PL_uid;
30 UV euid = PL_euid;
31
32 DEBUG_u(PerlIO_printf(Perl_debug_log,
33 "%s %d %"UVuf" %"UVuf"\n",
34 s, PL_tainted, uid, euid));
35 }
36# else
37 {
38 IV uid = PL_uid;
39 IV euid = PL_euid;
40
41 DEBUG_u(PerlIO_printf(Perl_debug_log,
42 "%s %d %"IVdf" %"IVdf"\n",
43 s, PL_tainted, uid, euid));
44 }
45# endif
a52cb5f7 46#endif
1e422769 47
3280af22 48 if (PL_tainted) {
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49 if (!f)
50 f = PL_no_security;
3280af22 51 if (PL_euid != PL_uid)
bbce6d69 52 ug = " while running setuid";
3280af22 53 else if (PL_egid != PL_gid)
bbce6d69 54 ug = " while running setgid";
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55 else if (PL_taint_warn)
56 ug = " while running with -t switch";
57 else
bbce6d69 58 ug = " while running with -T switch";
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59 if (PL_unsafe || PL_taint_warn) {
60 if(ckWARN(WARN_TAINT))
9014280d 61 Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug);
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62 }
63 else {
64 Perl_croak(aTHX_ f, s, ug);
65 }
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66 }
67}
68
69void
864dbfa3 70Perl_taint_env(pTHX)
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71{
72 SV** svp;
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73 MAGIC* mg;
74 char** e;
75 static char* misc_env[] = {
76 "IFS", /* most shells' inter-field separators */
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77 "CDPATH", /* ksh dain bramage #1 */
78 "ENV", /* ksh dain bramage #2 */
79 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
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80 NULL
81 };
1e422769 82
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83 /* Don't bother if there's no %ENV hash */
84 if (!PL_envgv || !GvHV(PL_envgv))
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85 return;
86
1e422769 87#ifdef VMS
82f1aded 88 {
1e422769 89 int i = 0;
0dc443ab 90 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
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91
92 while (1) {
93 if (i)
94 (void)sprintf(name,"DCL$PATH;%d", i);
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95 svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE);
96 if (!svp || *svp == &PL_sv_undef)
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97 break;
98 if (SvTAINTED(*svp)) {
99 TAINT;
100 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
101 }
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102 if (SvMAGICAL(*svp)
103 && (mg = mg_find(*svp, PERL_MAGIC_envelem))
104 && MgTAINTEDDIR(mg)) {
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105 TAINT;
106 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
107 }
108 i++;
109 }
82f1aded 110 }
1e422769 111#endif /* VMS */
79072805 112
3280af22 113 svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE);
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114 if (svp && *svp) {
115 if (SvTAINTED(*svp)) {
116 TAINT;
bbce6d69 117 taint_proper("Insecure %s%s", "$ENV{PATH}");
1e422769 118 }
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119 if (SvMAGICAL(*svp)
120 && (mg = mg_find(*svp, PERL_MAGIC_envelem))
121 && MgTAINTEDDIR(mg)) {
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122 TAINT;
123 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
124 }
79072805 125 }
79072805 126
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127#ifndef VMS
128 /* tainted $TERM is okay if it contains no metachars */
3280af22 129 svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE);
c90c0ff4 130 if (svp && *svp && SvTAINTED(*svp)) {
2d8e6c8d 131 STRLEN n_a;
3280af22 132 bool was_tainted = PL_tainted;
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133 char *t = SvPV(*svp, n_a);
134 char *e = t + n_a;
3280af22 135 PL_tainted = was_tainted;
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136 if (t < e && isALNUM(*t))
137 t++;
d085cc71 138 while (t < e && (isALNUM(*t) || strchr("-_.+", *t)))
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139 t++;
140 if (t < e) {
141 TAINT;
142 taint_proper("Insecure $ENV{%s}%s", "TERM");
143 }
144 }
145#endif /* !VMS */
146
7bac28a0 147 for (e = misc_env; *e; e++) {
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148 svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
149 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
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150 TAINT;
151 taint_proper("Insecure $ENV{%s}%s", *e);
152 }
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153 }
154}