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[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
79072805 11taint_proper(f, s)
71be2cbc 12const char *f;
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13char *s;
14{
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15 char *ug;
16
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17 DEBUG_u(PerlIO_printf(PerlIO_stderr(),
18 "%s %d %d %d\n", s, tainted, uid, euid));
19
bbce6d69 20 if (tainted) {
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21 if (euid != uid)
22 ug = " while running setuid";
23 else if (egid != gid)
24 ug = " while running setgid";
25 else
26 ug = " while running with -T switch";
27 if (!unsafe)
28 croak(f, s, ug);
29 else if (dowarn)
30 warn(f, s, ug);
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31 }
32}
33
34void
35taint_env()
36{
37 SV** svp;
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38 MAGIC* mg;
39 char** e;
40 static char* misc_env[] = {
41 "IFS", /* most shells' inter-field separators */
42 "ENV", /* ksh dain bramage #1 */
43 "CDPATH", /* ksh dain bramage #2 */
44 "TERM", /* some termcap libraries' dain bramage */
45 NULL
46 };
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47
48#ifdef VMS
49 int i = 0;
0dc443ab 50 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
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51
52 while (1) {
53 if (i)
54 (void)sprintf(name,"DCL$PATH;%d", i);
55 svp = hv_fetch(GvHVn(envgv), name, strlen(name), FALSE);
56 if (!svp || *svp == &sv_undef)
57 break;
58 if (SvTAINTED(*svp)) {
59 TAINT;
60 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
61 }
62 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
63 TAINT;
64 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
65 }
66 i++;
67 }
68#endif /* VMS */
79072805 69
bbce6d69 70 svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE);
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71 if (svp && *svp) {
72 if (SvTAINTED(*svp)) {
73 TAINT;
bbce6d69 74 taint_proper("Insecure %s%s", "$ENV{PATH}");
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75 }
76 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
77 TAINT;
78 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
79 }
79072805 80 }
79072805 81
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82 for (e = misc_env; *e; e++) {
83 svp = hv_fetch(GvHVn(envgv), *e, strlen(*e), FALSE);
84 if (svp && *svp != &sv_undef && SvTAINTED(*svp)) {
85 TAINT;
86 taint_proper("Insecure $ENV{%s}%s", *e);
87 }
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88 }
89}