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[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{
aeea060c 14 dTHR; /* just for taint */
bbce6d69
PP
15 char *ug;
16
fb73857a 17 DEBUG_u(PerlIO_printf(Perl_debug_log,
785fb66b 18 "%s %d %"Uid_t_f" %"Uid_t_f"\n", s, PL_tainted, PL_uid, PL_euid));
1e422769 19
3280af22 20 if (PL_tainted) {
22c35a8c
GS
21 if (!f)
22 f = PL_no_security;
3280af22 23 if (PL_euid != PL_uid)
bbce6d69 24 ug = " while running setuid";
3280af22 25 else if (PL_egid != PL_gid)
bbce6d69
PP
26 ug = " while running setgid";
27 else
28 ug = " while running with -T switch";
3280af22 29 if (!PL_unsafe)
cea2e8a9 30 Perl_croak(aTHX_ f, s, ug);
599cee73 31 else if (ckWARN(WARN_TAINT))
cea2e8a9 32 Perl_warner(aTHX_ WARN_TAINT, f, s, ug);
79072805
LW
33 }
34}
35
36void
864dbfa3 37Perl_taint_env(pTHX)
79072805
LW
38{
39 SV** svp;
7bac28a0
PP
40 MAGIC* mg;
41 char** e;
42 static char* misc_env[] = {
43 "IFS", /* most shells' inter-field separators */
c90c0ff4
PP
44 "CDPATH", /* ksh dain bramage #1 */
45 "ENV", /* ksh dain bramage #2 */
46 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
7bac28a0
PP
47 NULL
48 };
1e422769 49
142393a6
TM
50 if (!PL_envgv)
51 return;
52
1e422769 53#ifdef VMS
82f1aded 54 {
1e422769 55 int i = 0;
0dc443ab 56 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
1e422769
PP
57
58 while (1) {
59 if (i)
60 (void)sprintf(name,"DCL$PATH;%d", i);
6b88bc9c
GS
61 svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE);
62 if (!svp || *svp == &PL_sv_undef)
1e422769
PP
63 break;
64 if (SvTAINTED(*svp)) {
61bb5906 65 dTHR;
1e422769
PP
66 TAINT;
67 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
68 }
69 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
61bb5906 70 dTHR;
1e422769
PP
71 TAINT;
72 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
73 }
74 i++;
75 }
82f1aded 76 }
1e422769 77#endif /* VMS */
79072805 78
3280af22 79 svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE);
1e422769
PP
80 if (svp && *svp) {
81 if (SvTAINTED(*svp)) {
aeea060c 82 dTHR;
1e422769 83 TAINT;
bbce6d69 84 taint_proper("Insecure %s%s", "$ENV{PATH}");
1e422769
PP
85 }
86 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
aeea060c 87 dTHR;
1e422769
PP
88 TAINT;
89 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
90 }
79072805 91 }
79072805 92
c90c0ff4
PP
93#ifndef VMS
94 /* tainted $TERM is okay if it contains no metachars */
3280af22 95 svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE);
c90c0ff4 96 if (svp && *svp && SvTAINTED(*svp)) {
aeea060c 97 dTHR; /* just for taint */
2d8e6c8d 98 STRLEN n_a;
3280af22 99 bool was_tainted = PL_tainted;
2d8e6c8d
GS
100 char *t = SvPV(*svp, n_a);
101 char *e = t + n_a;
3280af22 102 PL_tainted = was_tainted;
c90c0ff4
PP
103 if (t < e && isALNUM(*t))
104 t++;
105 while (t < e && (isALNUM(*t) || *t == '-' || *t == ':'))
106 t++;
107 if (t < e) {
108 TAINT;
109 taint_proper("Insecure $ENV{%s}%s", "TERM");
110 }
111 }
112#endif /* !VMS */
113
7bac28a0 114 for (e = misc_env; *e; e++) {
3280af22
NIS
115 svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
116 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
aeea060c 117 dTHR; /* just for taint */
7bac28a0
PP
118 TAINT;
119 taint_proper("Insecure $ENV{%s}%s", *e);
120 }
bbce6d69
PP
121 }
122}