Commit | Line | Data |
---|---|---|
d6376244 JH |
1 | /* taint.c |
2 | * | |
4bb101f2 JH |
3 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
4 | * 2000, 2001, 2002, by Larry Wall and others | |
d6376244 JH |
5 | * |
6 | * You may distribute under the terms of either the GNU General Public | |
7 | * License or the Artistic License, as specified in the README file. | |
8 | * | |
9 | */ | |
10 | ||
a0d0e21e LW |
11 | /* |
12 | * "...we will have peace, when you and all your works have perished--and | |
13 | * the works of your dark master to whom you would deliver us. You are a | |
14 | * liar, Saruman, and a corrupter of men's hearts." --Theoden | |
15 | */ | |
16 | ||
463ee0b2 | 17 | #include "EXTERN.h" |
864dbfa3 | 18 | #define PERL_IN_TAINT_C |
463ee0b2 LW |
19 | #include "perl.h" |
20 | ||
21 | void | |
dff6d3cd | 22 | Perl_taint_proper(pTHX_ const char *f, const char *s) |
79072805 | 23 | { |
bbce6d69 | 24 | char *ug; |
25 | ||
26e623cf JH |
26 | #if defined(HAS_SETEUID) && defined(DEBUGGING) |
27 | # if Uid_t_size == 1 | |
28 | { | |
29 | UV uid = PL_uid; | |
30 | UV euid = PL_euid; | |
31 | ||
32 | DEBUG_u(PerlIO_printf(Perl_debug_log, | |
33 | "%s %d %"UVuf" %"UVuf"\n", | |
34 | s, PL_tainted, uid, euid)); | |
35 | } | |
36 | # else | |
37 | { | |
38 | IV uid = PL_uid; | |
39 | IV euid = PL_euid; | |
40 | ||
41 | DEBUG_u(PerlIO_printf(Perl_debug_log, | |
42 | "%s %d %"IVdf" %"IVdf"\n", | |
43 | s, PL_tainted, uid, euid)); | |
44 | } | |
45 | # endif | |
a52cb5f7 | 46 | #endif |
1e422769 | 47 | |
3280af22 | 48 | if (PL_tainted) { |
22c35a8c GS |
49 | if (!f) |
50 | f = PL_no_security; | |
3280af22 | 51 | if (PL_euid != PL_uid) |
bbce6d69 | 52 | ug = " while running setuid"; |
3280af22 | 53 | else if (PL_egid != PL_gid) |
bbce6d69 | 54 | ug = " while running setgid"; |
6537fe72 MS |
55 | else if (PL_taint_warn) |
56 | ug = " while running with -t switch"; | |
57 | else | |
bbce6d69 | 58 | ug = " while running with -T switch"; |
6537fe72 MS |
59 | if (PL_unsafe || PL_taint_warn) { |
60 | if(ckWARN(WARN_TAINT)) | |
9014280d | 61 | Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug); |
6537fe72 MS |
62 | } |
63 | else { | |
64 | Perl_croak(aTHX_ f, s, ug); | |
65 | } | |
79072805 LW |
66 | } |
67 | } | |
68 | ||
69 | void | |
864dbfa3 | 70 | Perl_taint_env(pTHX) |
79072805 LW |
71 | { |
72 | SV** svp; | |
7bac28a0 | 73 | MAGIC* mg; |
74 | char** e; | |
75 | static char* misc_env[] = { | |
76 | "IFS", /* most shells' inter-field separators */ | |
c90c0ff4 | 77 | "CDPATH", /* ksh dain bramage #1 */ |
78 | "ENV", /* ksh dain bramage #2 */ | |
79 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ | |
7bac28a0 | 80 | NULL |
81 | }; | |
1e422769 | 82 | |
142393a6 TM |
83 | if (!PL_envgv) |
84 | return; | |
85 | ||
1e422769 | 86 | #ifdef VMS |
82f1aded | 87 | { |
1e422769 | 88 | int i = 0; |
0dc443ab | 89 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
1e422769 | 90 | |
91 | while (1) { | |
92 | if (i) | |
93 | (void)sprintf(name,"DCL$PATH;%d", i); | |
6b88bc9c GS |
94 | svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE); |
95 | if (!svp || *svp == &PL_sv_undef) | |
1e422769 | 96 | break; |
97 | if (SvTAINTED(*svp)) { | |
98 | TAINT; | |
99 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); | |
100 | } | |
14befaf4 | 101 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 102 | TAINT; |
103 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); | |
104 | } | |
105 | i++; | |
106 | } | |
82f1aded | 107 | } |
1e422769 | 108 | #endif /* VMS */ |
79072805 | 109 | |
3280af22 | 110 | svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE); |
1e422769 | 111 | if (svp && *svp) { |
112 | if (SvTAINTED(*svp)) { | |
113 | TAINT; | |
bbce6d69 | 114 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
1e422769 | 115 | } |
14befaf4 | 116 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 117 | TAINT; |
118 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); | |
119 | } | |
79072805 | 120 | } |
79072805 | 121 | |
c90c0ff4 | 122 | #ifndef VMS |
123 | /* tainted $TERM is okay if it contains no metachars */ | |
3280af22 | 124 | svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE); |
c90c0ff4 | 125 | if (svp && *svp && SvTAINTED(*svp)) { |
2d8e6c8d | 126 | STRLEN n_a; |
3280af22 | 127 | bool was_tainted = PL_tainted; |
2d8e6c8d GS |
128 | char *t = SvPV(*svp, n_a); |
129 | char *e = t + n_a; | |
3280af22 | 130 | PL_tainted = was_tainted; |
c90c0ff4 | 131 | if (t < e && isALNUM(*t)) |
132 | t++; | |
d085cc71 | 133 | while (t < e && (isALNUM(*t) || strchr("-_.+", *t))) |
c90c0ff4 | 134 | t++; |
135 | if (t < e) { | |
136 | TAINT; | |
137 | taint_proper("Insecure $ENV{%s}%s", "TERM"); | |
138 | } | |
139 | } | |
140 | #endif /* !VMS */ | |
141 | ||
7bac28a0 | 142 | for (e = misc_env; *e; e++) { |
3280af22 NIS |
143 | svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); |
144 | if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { | |
7bac28a0 | 145 | TAINT; |
146 | taint_proper("Insecure $ENV{%s}%s", *e); | |
147 | } | |
bbce6d69 | 148 | } |
149 | } |