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Integrate post-beta tweaks to ansiperl
[perl5.git] / taint.c
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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
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7#include "EXTERN.h"
8#include "perl.h"
9
10void
8ac85365 11taint_proper(const char *f, char *s)
79072805 12{
aeea060c 13 dTHR; /* just for taint */
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14 char *ug;
15
fb73857a 16 DEBUG_u(PerlIO_printf(Perl_debug_log,
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17 "%s %d %d %d\n", s, tainted, uid, euid));
18
bbce6d69 19 if (tainted) {
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20 if (euid != uid)
21 ug = " while running setuid";
22 else if (egid != gid)
23 ug = " while running setgid";
24 else
25 ug = " while running with -T switch";
26 if (!unsafe)
27 croak(f, s, ug);
28 else if (dowarn)
29 warn(f, s, ug);
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30 }
31}
32
33void
8ac85365 34taint_env(void)
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35{
36 SV** svp;
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37 MAGIC* mg;
38 char** e;
39 static char* misc_env[] = {
40 "IFS", /* most shells' inter-field separators */
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41 "CDPATH", /* ksh dain bramage #1 */
42 "ENV", /* ksh dain bramage #2 */
43 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
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44 NULL
45 };
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46
47#ifdef VMS
48 int i = 0;
0dc443ab 49 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
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50
51 while (1) {
52 if (i)
53 (void)sprintf(name,"DCL$PATH;%d", i);
54 svp = hv_fetch(GvHVn(envgv), name, strlen(name), FALSE);
55 if (!svp || *svp == &sv_undef)
56 break;
57 if (SvTAINTED(*svp)) {
61bb5906 58 dTHR;
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59 TAINT;
60 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
61 }
62 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
61bb5906 63 dTHR;
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64 TAINT;
65 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
66 }
67 i++;
68 }
69#endif /* VMS */
79072805 70
bbce6d69 71 svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE);
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72 if (svp && *svp) {
73 if (SvTAINTED(*svp)) {
aeea060c 74 dTHR;
1e422769 75 TAINT;
bbce6d69 76 taint_proper("Insecure %s%s", "$ENV{PATH}");
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77 }
78 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
aeea060c 79 dTHR;
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80 TAINT;
81 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
82 }
79072805 83 }
79072805 84
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85#ifndef VMS
86 /* tainted $TERM is okay if it contains no metachars */
87 svp = hv_fetch(GvHVn(envgv),"TERM",4,FALSE);
88 if (svp && *svp && SvTAINTED(*svp)) {
aeea060c 89 dTHR; /* just for taint */
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90 bool was_tainted = tainted;
91 char *t = SvPV(*svp, na);
92 char *e = t + na;
93 tainted = was_tainted;
94 if (t < e && isALNUM(*t))
95 t++;
96 while (t < e && (isALNUM(*t) || *t == '-' || *t == ':'))
97 t++;
98 if (t < e) {
99 TAINT;
100 taint_proper("Insecure $ENV{%s}%s", "TERM");
101 }
102 }
103#endif /* !VMS */
104
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105 for (e = misc_env; *e; e++) {
106 svp = hv_fetch(GvHVn(envgv), *e, strlen(*e), FALSE);
107 if (svp && *svp != &sv_undef && SvTAINTED(*svp)) {
aeea060c 108 dTHR; /* just for taint */
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109 TAINT;
110 taint_proper("Insecure $ENV{%s}%s", *e);
111 }
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112 }
113}