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 | |
cdad3b53 | 14 | * liar, Saruman, and a corrupter of men's hearts.' --Théoden |
4ac71550 TC |
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 | 34 | { |
dfff4baf BF |
35 | const Uid_t uid = PerlProc_getuid(); |
36 | const Uid_t euid = PerlProc_geteuid(); | |
26e623cf | 37 | |
8772537c | 38 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
dfff4baf | 39 | "%s %d %"Uid_t_f" %"Uid_t_f"\n", |
284167a5 | 40 | s, TAINT_get, uid, euid)); |
26e623cf | 41 | } |
a52cb5f7 | 42 | #endif |
1e422769 | 43 | |
284167a5 | 44 | if (TAINT_get) { |
8772537c AL |
45 | const char *ug; |
46 | ||
22c35a8c GS |
47 | if (!f) |
48 | f = PL_no_security; | |
985213f2 | 49 | if (PerlProc_getuid() != PerlProc_geteuid()) |
bbce6d69 | 50 | ug = " while running setuid"; |
985213f2 | 51 | else if (PerlProc_getgid() != PerlProc_getegid()) |
bbce6d69 | 52 | ug = " while running setgid"; |
284167a5 | 53 | else if (TAINT_WARN_get) |
6537fe72 MS |
54 | ug = " while running with -t switch"; |
55 | else | |
bbce6d69 | 56 | ug = " while running with -T switch"; |
284167a5 | 57 | if (PL_unsafe || TAINT_WARN_get) { |
9b387841 | 58 | Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug); |
6537fe72 MS |
59 | } |
60 | else { | |
61 | Perl_croak(aTHX_ f, s, ug); | |
62 | } | |
79072805 LW |
63 | } |
64 | } | |
65 | ||
66 | void | |
864dbfa3 | 67 | Perl_taint_env(pTHX) |
79072805 | 68 | { |
97aff369 | 69 | dVAR; |
79072805 | 70 | SV** svp; |
7bac28a0 | 71 | MAGIC* mg; |
27da23d5 JH |
72 | const char* const *e; |
73 | static const char* const misc_env[] = { | |
7bac28a0 | 74 | "IFS", /* most shells' inter-field separators */ |
c90c0ff4 | 75 | "CDPATH", /* ksh dain bramage #1 */ |
76 | "ENV", /* ksh dain bramage #2 */ | |
77 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ | |
e62a6770 RGS |
78 | #ifdef WIN32 |
79 | "PERL5SHELL", /* used for system() on Windows */ | |
80 | #endif | |
7bac28a0 | 81 | NULL |
82 | }; | |
1e422769 | 83 | |
c038024b RGS |
84 | /* Don't bother if there's no *ENV glob */ |
85 | if (!PL_envgv) | |
142393a6 | 86 | return; |
284167a5 | 87 | /* If there's no %ENV hash or if it's not magical, croak, because |
c038024b RGS |
88 | * it probably doesn't reflect the actual environment */ |
89 | if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv)) | |
daba3364 | 90 | && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) { |
284167a5 | 91 | const bool was_tainted = TAINT_get; |
8772537c | 92 | const char * const name = GvENAME(PL_envgv); |
284167a5 | 93 | TAINT; |
c038024b RGS |
94 | if (strEQ(name,"ENV")) |
95 | /* hash alias */ | |
96 | taint_proper("%%ENV is aliased to %s%s", "another variable"); | |
97 | else | |
98 | /* glob alias: report it in the error message */ | |
99 | taint_proper("%%ENV is aliased to %%%s%s", name); | |
100 | /* this statement is reached under -t or -U */ | |
284167a5 | 101 | TAINT_set(was_tainted); |
9a9b5ec9 DM |
102 | #ifdef NO_TAINT_SUPPORT |
103 | PERL_UNUSED_VAR(was_tainted); | |
104 | #endif | |
c038024b | 105 | } |
142393a6 | 106 | |
1e422769 | 107 | #ifdef VMS |
82f1aded | 108 | { |
1e422769 | 109 | int i = 0; |
0dc443ab | 110 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
86c11942 | 111 | STRLEN len = 8; /* strlen(name) */ |
1e422769 | 112 | |
113 | while (1) { | |
114 | if (i) | |
86c11942 NC |
115 | len = my_sprintf(name,"DCL$PATH;%d", i); |
116 | svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE); | |
6b88bc9c | 117 | if (!svp || *svp == &PL_sv_undef) |
1e422769 | 118 | break; |
119 | if (SvTAINTED(*svp)) { | |
120 | TAINT; | |
121 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); | |
122 | } | |
c038024b | 123 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 124 | TAINT; |
125 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); | |
126 | } | |
127 | i++; | |
128 | } | |
82f1aded | 129 | } |
1e422769 | 130 | #endif /* VMS */ |
79072805 | 131 | |
a4fc7abc | 132 | svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE); |
1e422769 | 133 | if (svp && *svp) { |
134 | if (SvTAINTED(*svp)) { | |
135 | TAINT; | |
bbce6d69 | 136 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
1e422769 | 137 | } |
c038024b | 138 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 139 | TAINT; |
140 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); | |
141 | } | |
79072805 | 142 | } |
79072805 | 143 | |
c90c0ff4 | 144 | #ifndef VMS |
145 | /* tainted $TERM is okay if it contains no metachars */ | |
a4fc7abc | 146 | svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE); |
c90c0ff4 | 147 | if (svp && *svp && SvTAINTED(*svp)) { |
8b6b16e7 | 148 | STRLEN len; |
284167a5 | 149 | const bool was_tainted = TAINT_get; |
cfd0369c | 150 | const char *t = SvPV_const(*svp, len); |
8772537c | 151 | const char * const e = t + len; |
9a9b5ec9 | 152 | |
284167a5 | 153 | TAINT_set(was_tainted); |
9a9b5ec9 DM |
154 | #ifdef NO_TAINT_SUPPORT |
155 | PERL_UNUSED_VAR(was_tainted); | |
156 | #endif | |
0eb30aeb | 157 | if (t < e && isWORDCHAR(*t)) |
c90c0ff4 | 158 | t++; |
0eb30aeb | 159 | while (t < e && (isWORDCHAR(*t) || strchr("-_.+", *t))) |
c90c0ff4 | 160 | t++; |
161 | if (t < e) { | |
162 | TAINT; | |
163 | taint_proper("Insecure $ENV{%s}%s", "TERM"); | |
164 | } | |
165 | } | |
166 | #endif /* !VMS */ | |
167 | ||
7bac28a0 | 168 | for (e = misc_env; *e; e++) { |
0bd48802 | 169 | SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); |
3280af22 | 170 | if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { |
7bac28a0 | 171 | TAINT; |
172 | taint_proper("Insecure $ENV{%s}%s", *e); | |
173 | } | |
bbce6d69 | 174 | } |
175 | } | |
66610fdd RGS |
176 | |
177 | /* | |
178 | * Local variables: | |
179 | * c-indentation-style: bsd | |
180 | * c-basic-offset: 4 | |
14d04a33 | 181 | * indent-tabs-mode: nil |
66610fdd RGS |
182 | * End: |
183 | * | |
14d04a33 | 184 | * ex: set ts=8 sts=4 sw=4 et: |
37442d52 | 185 | */ |