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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 | ||
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 | |
dff6d3cd | 25 | Perl_taint_proper(pTHX_ const char *f, const char *s) |
79072805 | 26 | { |
26e623cf JH |
27 | #if defined(HAS_SETEUID) && defined(DEBUGGING) |
28 | # if Uid_t_size == 1 | |
29 | { | |
8772537c AL |
30 | const UV uid = PL_uid; |
31 | const UV euid = PL_euid; | |
26e623cf | 32 | |
8772537c | 33 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
26e623cf JH |
34 | "%s %d %"UVuf" %"UVuf"\n", |
35 | s, PL_tainted, uid, euid)); | |
36 | } | |
37 | # else | |
38 | { | |
8772537c AL |
39 | const IV uid = PL_uid; |
40 | const IV euid = PL_euid; | |
26e623cf | 41 | |
8772537c | 42 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
26e623cf JH |
43 | "%s %d %"IVdf" %"IVdf"\n", |
44 | s, PL_tainted, uid, euid)); | |
45 | } | |
46 | # endif | |
a52cb5f7 | 47 | #endif |
1e422769 | 48 | |
3280af22 | 49 | if (PL_tainted) { |
8772537c AL |
50 | const char *ug; |
51 | ||
22c35a8c GS |
52 | if (!f) |
53 | f = PL_no_security; | |
3280af22 | 54 | if (PL_euid != PL_uid) |
bbce6d69 | 55 | ug = " while running setuid"; |
3280af22 | 56 | else if (PL_egid != PL_gid) |
bbce6d69 | 57 | ug = " while running setgid"; |
6537fe72 MS |
58 | else if (PL_taint_warn) |
59 | ug = " while running with -t switch"; | |
60 | else | |
bbce6d69 | 61 | ug = " while running with -T switch"; |
6537fe72 MS |
62 | if (PL_unsafe || PL_taint_warn) { |
63 | if(ckWARN(WARN_TAINT)) | |
9014280d | 64 | Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug); |
6537fe72 MS |
65 | } |
66 | else { | |
67 | Perl_croak(aTHX_ f, s, ug); | |
68 | } | |
79072805 LW |
69 | } |
70 | } | |
71 | ||
72 | void | |
864dbfa3 | 73 | Perl_taint_env(pTHX) |
79072805 LW |
74 | { |
75 | SV** svp; | |
7bac28a0 | 76 | MAGIC* mg; |
27da23d5 JH |
77 | const char* const *e; |
78 | static const char* const misc_env[] = { | |
7bac28a0 | 79 | "IFS", /* most shells' inter-field separators */ |
c90c0ff4 | 80 | "CDPATH", /* ksh dain bramage #1 */ |
81 | "ENV", /* ksh dain bramage #2 */ | |
82 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ | |
7bac28a0 | 83 | NULL |
84 | }; | |
1e422769 | 85 | |
c038024b RGS |
86 | /* Don't bother if there's no *ENV glob */ |
87 | if (!PL_envgv) | |
142393a6 | 88 | return; |
c038024b RGS |
89 | /* If there's no %ENV hash of if it's not magical, croak, because |
90 | * it probably doesn't reflect the actual environment */ | |
91 | if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv)) | |
92 | && mg_find((SV*)GvHV(PL_envgv), PERL_MAGIC_env))) { | |
e1ec3a88 | 93 | const bool was_tainted = PL_tainted; |
8772537c | 94 | const char * const name = GvENAME(PL_envgv); |
c038024b RGS |
95 | PL_tainted = TRUE; |
96 | if (strEQ(name,"ENV")) | |
97 | /* hash alias */ | |
98 | taint_proper("%%ENV is aliased to %s%s", "another variable"); | |
99 | else | |
100 | /* glob alias: report it in the error message */ | |
101 | taint_proper("%%ENV is aliased to %%%s%s", name); | |
102 | /* this statement is reached under -t or -U */ | |
103 | PL_tainted = was_tainted; | |
104 | } | |
142393a6 | 105 | |
1e422769 | 106 | #ifdef VMS |
82f1aded | 107 | { |
1e422769 | 108 | int i = 0; |
0dc443ab | 109 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
1e422769 | 110 | |
111 | while (1) { | |
112 | if (i) | |
113 | (void)sprintf(name,"DCL$PATH;%d", i); | |
6b88bc9c GS |
114 | svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE); |
115 | if (!svp || *svp == &PL_sv_undef) | |
1e422769 | 116 | break; |
117 | if (SvTAINTED(*svp)) { | |
118 | TAINT; | |
119 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); | |
120 | } | |
c038024b | 121 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 122 | TAINT; |
123 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); | |
124 | } | |
125 | i++; | |
126 | } | |
82f1aded | 127 | } |
1e422769 | 128 | #endif /* VMS */ |
79072805 | 129 | |
3280af22 | 130 | svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE); |
1e422769 | 131 | if (svp && *svp) { |
132 | if (SvTAINTED(*svp)) { | |
133 | TAINT; | |
bbce6d69 | 134 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
1e422769 | 135 | } |
c038024b | 136 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
1e422769 | 137 | TAINT; |
138 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); | |
139 | } | |
79072805 | 140 | } |
79072805 | 141 | |
c90c0ff4 | 142 | #ifndef VMS |
143 | /* tainted $TERM is okay if it contains no metachars */ | |
3280af22 | 144 | svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE); |
c90c0ff4 | 145 | if (svp && *svp && SvTAINTED(*svp)) { |
8b6b16e7 | 146 | STRLEN len; |
73d840c0 | 147 | const bool was_tainted = PL_tainted; |
cfd0369c | 148 | const char *t = SvPV_const(*svp, len); |
8772537c | 149 | const char * const e = t + len; |
3280af22 | 150 | PL_tainted = was_tainted; |
c90c0ff4 | 151 | if (t < e && isALNUM(*t)) |
152 | t++; | |
d085cc71 | 153 | while (t < e && (isALNUM(*t) || strchr("-_.+", *t))) |
c90c0ff4 | 154 | t++; |
155 | if (t < e) { | |
156 | TAINT; | |
157 | taint_proper("Insecure $ENV{%s}%s", "TERM"); | |
158 | } | |
159 | } | |
160 | #endif /* !VMS */ | |
161 | ||
7bac28a0 | 162 | for (e = misc_env; *e; e++) { |
8772537c | 163 | SV ** const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); |
3280af22 | 164 | if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { |
7bac28a0 | 165 | TAINT; |
166 | taint_proper("Insecure $ENV{%s}%s", *e); | |
167 | } | |
bbce6d69 | 168 | } |
169 | } | |
66610fdd RGS |
170 | |
171 | /* | |
172 | * Local variables: | |
173 | * c-indentation-style: bsd | |
174 | * c-basic-offset: 4 | |
175 | * indent-tabs-mode: t | |
176 | * End: | |
177 | * | |
37442d52 RGS |
178 | * ex: set ts=8 sts=4 sw=4 noet: |
179 | */ |