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