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The U32 alignment test wasn't really working, noticed
[perl5.git] / taint.c
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a0d0e21e
LW
1/*
2 * "...we will have peace, when you and all your works have perished--and
3 * the works of your dark master to whom you would deliver us. You are a
4 * liar, Saruman, and a corrupter of men's hearts." --Theoden
5 */
6
463ee0b2 7#include "EXTERN.h"
864dbfa3 8#define PERL_IN_TAINT_C
463ee0b2
LW
9#include "perl.h"
10
11void
dff6d3cd 12Perl_taint_proper(pTHX_ const char *f, const char *s)
79072805 13{
bbce6d69
PP
14 char *ug;
15
a52cb5f7 16#ifdef HAS_SETEUID
fb73857a 17 DEBUG_u(PerlIO_printf(Perl_debug_log,
fe5a182c 18 "%s %d %"Uid_t_f" %"Uid_t_f"\n", s, PL_tainted, (Uid_t)PL_uid, (Uid_t)PL_euid));
a52cb5f7 19#endif
1e422769 20
3280af22 21 if (PL_tainted) {
22c35a8c
GS
22 if (!f)
23 f = PL_no_security;
3280af22 24 if (PL_euid != PL_uid)
bbce6d69 25 ug = " while running setuid";
3280af22 26 else if (PL_egid != PL_gid)
bbce6d69 27 ug = " while running setgid";
6537fe72
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28 else if (PL_taint_warn)
29 ug = " while running with -t switch";
30 else
bbce6d69 31 ug = " while running with -T switch";
6537fe72
MS
32 if (PL_unsafe || PL_taint_warn) {
33 if(ckWARN(WARN_TAINT))
34 Perl_warner(aTHX_ WARN_TAINT, f, s, ug);
35 }
36 else {
37 Perl_croak(aTHX_ f, s, ug);
38 }
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LW
39 }
40}
41
42void
864dbfa3 43Perl_taint_env(pTHX)
79072805
LW
44{
45 SV** svp;
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PP
46 MAGIC* mg;
47 char** e;
48 static char* misc_env[] = {
49 "IFS", /* most shells' inter-field separators */
c90c0ff4
PP
50 "CDPATH", /* ksh dain bramage #1 */
51 "ENV", /* ksh dain bramage #2 */
52 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
7bac28a0
PP
53 NULL
54 };
1e422769 55
142393a6
TM
56 if (!PL_envgv)
57 return;
58
1e422769 59#ifdef VMS
82f1aded 60 {
1e422769 61 int i = 0;
0dc443ab 62 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
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PP
63
64 while (1) {
65 if (i)
66 (void)sprintf(name,"DCL$PATH;%d", i);
6b88bc9c
GS
67 svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE);
68 if (!svp || *svp == &PL_sv_undef)
1e422769
PP
69 break;
70 if (SvTAINTED(*svp)) {
71 TAINT;
72 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
73 }
14befaf4 74 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
1e422769
PP
75 TAINT;
76 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
77 }
78 i++;
79 }
82f1aded 80 }
1e422769 81#endif /* VMS */
79072805 82
3280af22 83 svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE);
1e422769
PP
84 if (svp && *svp) {
85 if (SvTAINTED(*svp)) {
86 TAINT;
bbce6d69 87 taint_proper("Insecure %s%s", "$ENV{PATH}");
1e422769 88 }
14befaf4 89 if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
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PP
90 TAINT;
91 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
92 }
79072805 93 }
79072805 94
c90c0ff4
PP
95#ifndef VMS
96 /* tainted $TERM is okay if it contains no metachars */
3280af22 97 svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE);
c90c0ff4 98 if (svp && *svp && SvTAINTED(*svp)) {
2d8e6c8d 99 STRLEN n_a;
3280af22 100 bool was_tainted = PL_tainted;
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GS
101 char *t = SvPV(*svp, n_a);
102 char *e = t + n_a;
3280af22 103 PL_tainted = was_tainted;
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PP
104 if (t < e && isALNUM(*t))
105 t++;
106 while (t < e && (isALNUM(*t) || *t == '-' || *t == ':'))
107 t++;
108 if (t < e) {
109 TAINT;
110 taint_proper("Insecure $ENV{%s}%s", "TERM");
111 }
112 }
113#endif /* !VMS */
114
7bac28a0 115 for (e = misc_env; *e; e++) {
3280af22
NIS
116 svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
117 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
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PP
118 TAINT;
119 taint_proper("Insecure $ENV{%s}%s", *e);
120 }
bbce6d69
PP
121 }
122}