Commit | Line | Data |
---|---|---|
d6376244 JH |
1 | /* taint.c |
2 | * | |
663f364b NC |
3 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, |
4 | * 2002, 2003, 2004, 2005, 2006, 2007, 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 | ||
166f8a29 DM |
17 | /* This file contains a few functions for handling data tainting in Perl |
18 | */ | |
19 | ||
463ee0b2 | 20 | #include "EXTERN.h" |
864dbfa3 | 21 | #define PERL_IN_TAINT_C |
463ee0b2 LW |
22 | #include "perl.h" |
23 | ||
24 | void | |
e1c41806 | 25 | Perl_taint_proper(pTHX_ const char *f, const char *const s) |
79072805 | 26 | { |
26e623cf | 27 | #if defined(HAS_SETEUID) && defined(DEBUGGING) |
97aff369 | 28 | dVAR; |
7918f24d NC |
29 | |
30 | PERL_ARGS_ASSERT_TAINT_PROPER; | |
31 | ||
26e623cf JH |
32 | # if Uid_t_size == 1 |
33 | { | |
8772537c AL |
34 | const UV uid = PL_uid; |
35 | const UV euid = PL_euid; | |
26e623cf | 36 | |
8772537c | 37 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
26e623cf JH |
38 | "%s %d %"UVuf" %"UVuf"\n", |
39 | s, PL_tainted, uid, euid)); | |
40 | } | |
41 | # else | |
42 | { | |
8772537c AL |
43 | const IV uid = PL_uid; |
44 | const IV euid = PL_euid; | |
26e623cf | 45 | |
8772537c | 46 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
26e623cf JH |
47 | "%s %d %"IVdf" %"IVdf"\n", |
48 | s, PL_tainted, uid, euid)); | |
49 | } | |
50 | # endif | |
a52cb5f7 | 51 | #endif |
1e422769 | 52 | |
3280af22 | 53 | if (PL_tainted) { |
8772537c AL |
54 | const char *ug; |
55 | ||
22c35a8c GS |
56 | if (!f) |
57 | f = PL_no_security; | |
3280af22 | 58 | if (PL_euid != PL_uid) |
bbce6d69 | 59 | ug = " while running setuid"; |
3280af22 | 60 | else if (PL_egid != PL_gid) |
bbce6d69 | 61 | ug = " while running setgid"; |
6537fe72 MS |
62 | else if (PL_taint_warn) |
63 | ug = " while running with -t switch"; | |
64 | else | |
bbce6d69 | 65 | ug = " while running with -T switch"; |
6537fe72 | 66 | if (PL_unsafe || PL_taint_warn) { |
b7bf404b | 67 | if(ckWARN_d(WARN_TAINT)) |
9014280d | 68 | Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug); |
6537fe72 MS |
69 | } |
70 | else { | |
71 | Perl_croak(aTHX_ f, s, ug); | |
72 | } | |
79072805 LW |
73 | } |
74 | } | |
75 | ||
76 | void | |
864dbfa3 | 77 | Perl_taint_env(pTHX) |
79072805 | 78 | { |
97aff369 | 79 | dVAR; |
79072805 | 80 | SV** svp; |
7bac28a0 | 81 | MAGIC* mg; |
27da23d5 JH |
82 | const char* const *e; |
83 | static const char* const misc_env[] = { | |
7bac28a0 | 84 | "IFS", /* most shells' inter-field separators */ |
c90c0ff4 | 85 | "CDPATH", /* ksh dain bramage #1 */ |
86 | "ENV", /* ksh dain bramage #2 */ | |
87 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ | |
e62a6770 RGS |
88 | #ifdef WIN32 |
89 | "PERL5SHELL", /* used for system() on Windows */ | |
90 | #endif | |
7bac28a0 | 91 | NULL |
92 | }; | |
1e422769 | 93 | |
c038024b RGS |
94 | /* Don't bother if there's no *ENV glob */ |
95 | if (!PL_envgv) | |
142393a6 | 96 | return; |
c038024b RGS |
97 | /* If there's no %ENV hash of if it's not magical, croak, because |
98 | * it probably doesn't reflect the actual environment */ | |
99 | if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv)) | |
100 | && mg_find((SV*)GvHV(PL_envgv), PERL_MAGIC_env))) { | |
e1ec3a88 | 101 | const bool was_tainted = PL_tainted; |
8772537c | 102 | const char * const name = GvENAME(PL_envgv); |
c038024b RGS |
103 | PL_tainted = TRUE; |
104 | if (strEQ(name,"ENV")) | |
105 | /* hash alias */ | |
106 | taint_proper("%%ENV is aliased to %s%s", "another variable"); | |
107 | else | |
108 | /* glob alias: report it in the error message */ | |
109 | taint_proper("%%ENV is aliased to %%%s%s", name); | |
110 | /* this statement is reached under -t or -U */ | |
111 | PL_tainted = was_tainted; | |
112 | } | |
142393a6 | 113 | |
1e422769 | 114 | #ifdef VMS |
82f1aded | 115 | { |
1e422769 | 116 | int i = 0; |
0dc443ab | 117 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
86c11942 | 118 | STRLEN len = 8; /* strlen(name) */ |
1e422769 | 119 | |
120 | while (1) { | |
121 | if (i) | |
86c11942 NC |
122 | len = my_sprintf(name,"DCL$PATH;%d", i); |
123 | svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE); | |
6b88bc9c | 124 | if (!svp || *svp == &PL_sv_undef) |
1e422769 | 125 | break; |
126 | if (SvTAINTED(*svp)) { | |
127 | TAINT; | |
128 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); | |
129 | } | |
c038024b | 130 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 131 | TAINT; |
132 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); | |
133 | } | |
134 | i++; | |
135 | } | |
82f1aded | 136 | } |
1e422769 | 137 | #endif /* VMS */ |
79072805 | 138 | |
a4fc7abc | 139 | svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE); |
1e422769 | 140 | if (svp && *svp) { |
141 | if (SvTAINTED(*svp)) { | |
142 | TAINT; | |
bbce6d69 | 143 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
1e422769 | 144 | } |
c038024b | 145 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 146 | TAINT; |
147 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); | |
148 | } | |
79072805 | 149 | } |
79072805 | 150 | |
c90c0ff4 | 151 | #ifndef VMS |
152 | /* tainted $TERM is okay if it contains no metachars */ | |
a4fc7abc | 153 | svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE); |
c90c0ff4 | 154 | if (svp && *svp && SvTAINTED(*svp)) { |
8b6b16e7 | 155 | STRLEN len; |
73d840c0 | 156 | const bool was_tainted = PL_tainted; |
cfd0369c | 157 | const char *t = SvPV_const(*svp, len); |
8772537c | 158 | const char * const e = t + len; |
3280af22 | 159 | PL_tainted = was_tainted; |
c90c0ff4 | 160 | if (t < e && isALNUM(*t)) |
161 | t++; | |
d085cc71 | 162 | while (t < e && (isALNUM(*t) || strchr("-_.+", *t))) |
c90c0ff4 | 163 | t++; |
164 | if (t < e) { | |
165 | TAINT; | |
166 | taint_proper("Insecure $ENV{%s}%s", "TERM"); | |
167 | } | |
168 | } | |
169 | #endif /* !VMS */ | |
170 | ||
7bac28a0 | 171 | for (e = misc_env; *e; e++) { |
0bd48802 | 172 | SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); |
3280af22 | 173 | if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { |
7bac28a0 | 174 | TAINT; |
175 | taint_proper("Insecure $ENV{%s}%s", *e); | |
176 | } | |
bbce6d69 | 177 | } |
178 | } | |
66610fdd RGS |
179 | |
180 | /* | |
181 | * Local variables: | |
182 | * c-indentation-style: bsd | |
183 | * c-basic-offset: 4 | |
184 | * indent-tabs-mode: t | |
185 | * End: | |
186 | * | |
37442d52 RGS |
187 | * ex: set ts=8 sts=4 sw=4 noet: |
188 | */ |