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1 | /* taint.c |
2 | * |
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3 | * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, |
4 | * 2000, 2001, 2002, by Larry Wall and others |
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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 | /* |
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 | |
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17 | #include "EXTERN.h" |
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18 | #define PERL_IN_TAINT_C |
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19 | #include "perl.h" |
20 | |
21 | void |
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22 | Perl_taint_proper(pTHX_ const char *f, const char *s) |
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23 | { |
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24 | char *ug; |
25 | |
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26 | #if defined(HAS_SETEUID) && defined(DEBUGGING) |
27 | # if Uid_t_size == 1 |
28 | { |
29 | UV uid = PL_uid; |
30 | UV euid = PL_euid; |
31 | |
32 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
33 | "%s %d %"UVuf" %"UVuf"\n", |
34 | s, PL_tainted, uid, euid)); |
35 | } |
36 | # else |
37 | { |
38 | IV uid = PL_uid; |
39 | IV euid = PL_euid; |
40 | |
41 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
42 | "%s %d %"IVdf" %"IVdf"\n", |
43 | s, PL_tainted, uid, euid)); |
44 | } |
45 | # endif |
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46 | #endif |
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47 | |
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48 | if (PL_tainted) { |
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49 | if (!f) |
50 | f = PL_no_security; |
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51 | if (PL_euid != PL_uid) |
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52 | ug = " while running setuid"; |
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53 | else if (PL_egid != PL_gid) |
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54 | ug = " while running setgid"; |
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55 | else if (PL_taint_warn) |
56 | ug = " while running with -t switch"; |
57 | else |
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58 | ug = " while running with -T switch"; |
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59 | if (PL_unsafe || PL_taint_warn) { |
60 | if(ckWARN(WARN_TAINT)) |
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61 | Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug); |
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62 | } |
63 | else { |
64 | Perl_croak(aTHX_ f, s, ug); |
65 | } |
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66 | } |
67 | } |
68 | |
69 | void |
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70 | Perl_taint_env(pTHX) |
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71 | { |
72 | SV** svp; |
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73 | MAGIC* mg; |
74 | char** e; |
75 | static char* misc_env[] = { |
76 | "IFS", /* most shells' inter-field separators */ |
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77 | "CDPATH", /* ksh dain bramage #1 */ |
78 | "ENV", /* ksh dain bramage #2 */ |
79 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ |
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80 | NULL |
81 | }; |
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82 | |
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83 | /* Don't bother if there's no %ENV hash */ |
84 | if (!PL_envgv || !GvHV(PL_envgv)) |
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85 | return; |
86 | |
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87 | #ifdef VMS |
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88 | { |
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89 | int i = 0; |
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90 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
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91 | |
92 | while (1) { |
93 | if (i) |
94 | (void)sprintf(name,"DCL$PATH;%d", i); |
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95 | svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE); |
96 | if (!svp || *svp == &PL_sv_undef) |
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97 | break; |
98 | if (SvTAINTED(*svp)) { |
99 | TAINT; |
100 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); |
101 | } |
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102 | if (SvMAGICAL(*svp) |
103 | && (mg = mg_find(*svp, PERL_MAGIC_envelem)) |
104 | && MgTAINTEDDIR(mg)) { |
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105 | TAINT; |
106 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); |
107 | } |
108 | i++; |
109 | } |
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110 | } |
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111 | #endif /* VMS */ |
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112 | |
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113 | svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE); |
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114 | if (svp && *svp) { |
115 | if (SvTAINTED(*svp)) { |
116 | TAINT; |
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117 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
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118 | } |
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119 | if (SvMAGICAL(*svp) |
120 | && (mg = mg_find(*svp, PERL_MAGIC_envelem)) |
121 | && MgTAINTEDDIR(mg)) { |
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122 | TAINT; |
123 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); |
124 | } |
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125 | } |
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126 | |
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127 | #ifndef VMS |
128 | /* tainted $TERM is okay if it contains no metachars */ |
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129 | svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE); |
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130 | if (svp && *svp && SvTAINTED(*svp)) { |
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131 | STRLEN n_a; |
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132 | bool was_tainted = PL_tainted; |
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133 | char *t = SvPV(*svp, n_a); |
134 | char *e = t + n_a; |
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135 | PL_tainted = was_tainted; |
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136 | if (t < e && isALNUM(*t)) |
137 | t++; |
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138 | while (t < e && (isALNUM(*t) || strchr("-_.+", *t))) |
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139 | t++; |
140 | if (t < e) { |
141 | TAINT; |
142 | taint_proper("Insecure $ENV{%s}%s", "TERM"); |
143 | } |
144 | } |
145 | #endif /* !VMS */ |
146 | |
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147 | for (e = misc_env; *e; e++) { |
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148 | svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); |
149 | if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { |
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150 | TAINT; |
151 | taint_proper("Insecure $ENV{%s}%s", *e); |
152 | } |
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153 | } |
154 | } |