Maintenance 5.004_04 changes
[p5sagit/p5-mst-13.2.git] / taint.c
CommitLineData
a0d0e21e 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"
8#include "perl.h"
9
10void
79072805 11taint_proper(f, s)
71be2cbc 12const char *f;
79072805 13char *s;
14{
bbce6d69 15 char *ug;
16
fb73857a 17 DEBUG_u(PerlIO_printf(Perl_debug_log,
1e422769 18 "%s %d %d %d\n", s, tainted, uid, euid));
19
bbce6d69 20 if (tainted) {
bbce6d69 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);
79072805 31 }
32}
33
34void
35taint_env()
36{
37 SV** svp;
7bac28a0 38 MAGIC* mg;
39 char** e;
40 static char* misc_env[] = {
41 "IFS", /* most shells' inter-field separators */
c90c0ff4 42 "CDPATH", /* ksh dain bramage #1 */
43 "ENV", /* ksh dain bramage #2 */
44 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
7bac28a0 45 NULL
46 };
1e422769 47
48#ifdef VMS
49 int i = 0;
0dc443ab 50 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
1e422769 51
52 while (1) {
53 if (i)
54 (void)sprintf(name,"DCL$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);
1e422769 71 if (svp && *svp) {
72 if (SvTAINTED(*svp)) {
73 TAINT;
bbce6d69 74 taint_proper("Insecure %s%s", "$ENV{PATH}");
1e422769 75 }
76 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
77 TAINT;
78 taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
79 }
79072805 80 }
79072805 81
c90c0ff4 82#ifndef VMS
83 /* tainted $TERM is okay if it contains no metachars */
84 svp = hv_fetch(GvHVn(envgv),"TERM",4,FALSE);
85 if (svp && *svp && SvTAINTED(*svp)) {
86 bool was_tainted = tainted;
87 char *t = SvPV(*svp, na);
88 char *e = t + na;
89 tainted = was_tainted;
90 if (t < e && isALNUM(*t))
91 t++;
92 while (t < e && (isALNUM(*t) || *t == '-' || *t == ':'))
93 t++;
94 if (t < e) {
95 TAINT;
96 taint_proper("Insecure $ENV{%s}%s", "TERM");
97 }
98 }
99#endif /* !VMS */
100
7bac28a0 101 for (e = misc_env; *e; e++) {
102 svp = hv_fetch(GvHVn(envgv), *e, strlen(*e), FALSE);
103 if (svp && *svp != &sv_undef && SvTAINTED(*svp)) {
104 TAINT;
105 taint_proper("Insecure $ENV{%s}%s", *e);
106 }
bbce6d69 107 }
108}