Commit | Line | Data |
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d6376244 JH |
1 | /* taint.c |
2 | * | |
663f364b | 3 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
1129b882 | 4 | * 2002, 2003, 2004, 2005, 2006, 2007, 2008 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 | 11 | /* |
4ac71550 TC |
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.' --Théoden | |
15 | * | |
16 | * [p.580 of _The Lord of the Rings_, III/x: "The Voice of Saruman"] | |
a0d0e21e LW |
17 | */ |
18 | ||
166f8a29 DM |
19 | /* This file contains a few functions for handling data tainting in Perl |
20 | */ | |
21 | ||
463ee0b2 | 22 | #include "EXTERN.h" |
864dbfa3 | 23 | #define PERL_IN_TAINT_C |
463ee0b2 LW |
24 | #include "perl.h" |
25 | ||
26 | void | |
e1c41806 | 27 | Perl_taint_proper(pTHX_ const char *f, const char *const s) |
79072805 | 28 | { |
26e623cf | 29 | #if defined(HAS_SETEUID) && defined(DEBUGGING) |
97aff369 | 30 | dVAR; |
7918f24d NC |
31 | |
32 | PERL_ARGS_ASSERT_TAINT_PROPER; | |
33 | ||
26e623cf JH |
34 | # if Uid_t_size == 1 |
35 | { | |
8772537c AL |
36 | const UV uid = PL_uid; |
37 | const UV euid = PL_euid; | |
26e623cf | 38 | |
8772537c | 39 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
26e623cf JH |
40 | "%s %d %"UVuf" %"UVuf"\n", |
41 | s, PL_tainted, uid, euid)); | |
42 | } | |
43 | # else | |
44 | { | |
8772537c AL |
45 | const IV uid = PL_uid; |
46 | const IV euid = PL_euid; | |
26e623cf | 47 | |
8772537c | 48 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
26e623cf JH |
49 | "%s %d %"IVdf" %"IVdf"\n", |
50 | s, PL_tainted, uid, euid)); | |
51 | } | |
52 | # endif | |
a52cb5f7 | 53 | #endif |
1e422769 | 54 | |
3280af22 | 55 | if (PL_tainted) { |
8772537c AL |
56 | const char *ug; |
57 | ||
22c35a8c GS |
58 | if (!f) |
59 | f = PL_no_security; | |
3280af22 | 60 | if (PL_euid != PL_uid) |
bbce6d69 | 61 | ug = " while running setuid"; |
3280af22 | 62 | else if (PL_egid != PL_gid) |
bbce6d69 | 63 | ug = " while running setgid"; |
6537fe72 MS |
64 | else if (PL_taint_warn) |
65 | ug = " while running with -t switch"; | |
66 | else | |
bbce6d69 | 67 | ug = " while running with -T switch"; |
6537fe72 | 68 | if (PL_unsafe || PL_taint_warn) { |
9b387841 | 69 | Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug); |
6537fe72 MS |
70 | } |
71 | else { | |
72 | Perl_croak(aTHX_ f, s, ug); | |
73 | } | |
79072805 LW |
74 | } |
75 | } | |
76 | ||
77 | void | |
864dbfa3 | 78 | Perl_taint_env(pTHX) |
79072805 | 79 | { |
97aff369 | 80 | dVAR; |
79072805 | 81 | SV** svp; |
7bac28a0 | 82 | MAGIC* mg; |
27da23d5 JH |
83 | const char* const *e; |
84 | static const char* const misc_env[] = { | |
7bac28a0 | 85 | "IFS", /* most shells' inter-field separators */ |
c90c0ff4 | 86 | "CDPATH", /* ksh dain bramage #1 */ |
87 | "ENV", /* ksh dain bramage #2 */ | |
88 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ | |
e62a6770 RGS |
89 | #ifdef WIN32 |
90 | "PERL5SHELL", /* used for system() on Windows */ | |
91 | #endif | |
7bac28a0 | 92 | NULL |
93 | }; | |
1e422769 | 94 | |
c038024b RGS |
95 | /* Don't bother if there's no *ENV glob */ |
96 | if (!PL_envgv) | |
142393a6 | 97 | return; |
c038024b RGS |
98 | /* If there's no %ENV hash of if it's not magical, croak, because |
99 | * it probably doesn't reflect the actual environment */ | |
100 | if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv)) | |
daba3364 | 101 | && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) { |
e1ec3a88 | 102 | const bool was_tainted = PL_tainted; |
8772537c | 103 | const char * const name = GvENAME(PL_envgv); |
c038024b RGS |
104 | PL_tainted = TRUE; |
105 | if (strEQ(name,"ENV")) | |
106 | /* hash alias */ | |
107 | taint_proper("%%ENV is aliased to %s%s", "another variable"); | |
108 | else | |
109 | /* glob alias: report it in the error message */ | |
110 | taint_proper("%%ENV is aliased to %%%s%s", name); | |
111 | /* this statement is reached under -t or -U */ | |
112 | PL_tainted = was_tainted; | |
113 | } | |
142393a6 | 114 | |
1e422769 | 115 | #ifdef VMS |
82f1aded | 116 | { |
1e422769 | 117 | int i = 0; |
0dc443ab | 118 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
86c11942 | 119 | STRLEN len = 8; /* strlen(name) */ |
1e422769 | 120 | |
121 | while (1) { | |
122 | if (i) | |
86c11942 NC |
123 | len = my_sprintf(name,"DCL$PATH;%d", i); |
124 | svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE); | |
6b88bc9c | 125 | if (!svp || *svp == &PL_sv_undef) |
1e422769 | 126 | break; |
127 | if (SvTAINTED(*svp)) { | |
128 | TAINT; | |
129 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); | |
130 | } | |
c038024b | 131 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 132 | TAINT; |
133 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); | |
134 | } | |
135 | i++; | |
136 | } | |
82f1aded | 137 | } |
1e422769 | 138 | #endif /* VMS */ |
79072805 | 139 | |
a4fc7abc | 140 | svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE); |
1e422769 | 141 | if (svp && *svp) { |
142 | if (SvTAINTED(*svp)) { | |
143 | TAINT; | |
bbce6d69 | 144 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
1e422769 | 145 | } |
c038024b | 146 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 147 | TAINT; |
148 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); | |
149 | } | |
79072805 | 150 | } |
79072805 | 151 | |
c90c0ff4 | 152 | #ifndef VMS |
153 | /* tainted $TERM is okay if it contains no metachars */ | |
a4fc7abc | 154 | svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE); |
c90c0ff4 | 155 | if (svp && *svp && SvTAINTED(*svp)) { |
8b6b16e7 | 156 | STRLEN len; |
73d840c0 | 157 | const bool was_tainted = PL_tainted; |
cfd0369c | 158 | const char *t = SvPV_const(*svp, len); |
8772537c | 159 | const char * const e = t + len; |
3280af22 | 160 | PL_tainted = was_tainted; |
c90c0ff4 | 161 | if (t < e && isALNUM(*t)) |
162 | t++; | |
d085cc71 | 163 | while (t < e && (isALNUM(*t) || strchr("-_.+", *t))) |
c90c0ff4 | 164 | t++; |
165 | if (t < e) { | |
166 | TAINT; | |
167 | taint_proper("Insecure $ENV{%s}%s", "TERM"); | |
168 | } | |
169 | } | |
170 | #endif /* !VMS */ | |
171 | ||
7bac28a0 | 172 | for (e = misc_env; *e; e++) { |
0bd48802 | 173 | SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); |
3280af22 | 174 | if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { |
7bac28a0 | 175 | TAINT; |
176 | taint_proper("Insecure $ENV{%s}%s", *e); | |
177 | } | |
bbce6d69 | 178 | } |
179 | } | |
66610fdd RGS |
180 | |
181 | /* | |
182 | * Local variables: | |
183 | * c-indentation-style: bsd | |
184 | * c-basic-offset: 4 | |
185 | * indent-tabs-mode: t | |
186 | * End: | |
187 | * | |
37442d52 RGS |
188 | * ex: set ts=8 sts=4 sw=4 noet: |
189 | */ |