1 /* 2 * "...we will have peace, when you and all your works have perished--and 3 * the works of your dark master to whom you would deliver us. You are a 4 * liar, Saruman, and a corrupter of men's hearts." --Theoden 5 */ 6 7 #include "EXTERN.h" 8 #define PERL_IN_TAINT_C 9 #include "perl.h" 10 11 void 12 Perl_taint_proper(pTHX_ const char *f, const char *s) 13 { 14 char *ug; 15 16 #ifdef HAS_SETEUID 17 DEBUG_u(PerlIO_printf(Perl_debug_log, 18 "%s %d %"Uid_t_f" %"Uid_t_f"\n", s, PL_tainted, PL_uid, PL_euid)); 19 #endif 20 21 if (PL_tainted) { 22 if (!f) 23 f = PL_no_security; 24 if (PL_euid != PL_uid) 25 ug = " while running setuid"; 26 else if (PL_egid != PL_gid) 27 ug = " while running setgid"; 28 else 29 ug = " while running with -T switch"; 30 if (!PL_unsafe) 31 Perl_croak(aTHX_ f, s, ug); 32 else if (ckWARN(WARN_TAINT)) 33 Perl_warner(aTHX_ WARN_TAINT, f, s, ug); 34 } 35 } 36 37 void 38 Perl_taint_env(pTHX) 39 { 40 SV** svp; 41 MAGIC* mg; 42 char** e; 43 static char* misc_env[] = { 44 "IFS", /* most shells' inter-field separators */ 45 "CDPATH", /* ksh dain bramage #1 */ 46 "ENV", /* ksh dain bramage #2 */ 47 "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ 48 NULL 49 }; 50 51 if (!PL_envgv) 52 return; 53 54 #ifdef VMS 55 { 56 int i = 0; 57 char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; 58 59 while (1) { 60 if (i) 61 (void)sprintf(name,"DCL$PATH;%d", i); 62 svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE); 63 if (!svp || *svp == &PL_sv_undef) 64 break; 65 if (SvTAINTED(*svp)) { 66 TAINT; 67 taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); 68 } 69 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) { 70 TAINT; 71 taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); 72 } 73 i++; 74 } 75 } 76 #endif /* VMS */ 77 78 svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE); 79 if (svp && *svp) { 80 if (SvTAINTED(*svp)) { 81 TAINT; 82 taint_proper("Insecure %s%s", "$ENV{PATH}"); 83 } 84 if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) { 85 TAINT; 86 taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); 87 } 88 } 89 90 #ifndef VMS 91 /* tainted $TERM is okay if it contains no metachars */ 92 svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE); 93 if (svp && *svp && SvTAINTED(*svp)) { 94 STRLEN n_a; 95 bool was_tainted = PL_tainted; 96 char *t = SvPV(*svp, n_a); 97 char *e = t + n_a; 98 PL_tainted = was_tainted; 99 if (t < e && isALNUM(*t)) 100 t++; 101 while (t < e && (isALNUM(*t) || *t == '-' || *t == ':')) 102 t++; 103 if (t < e) { 104 TAINT; 105 taint_proper("Insecure $ENV{%s}%s", "TERM"); 106 } 107 } 108 #endif /* !VMS */ 109 110 for (e = misc_env; *e; e++) { 111 svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); 112 if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { 113 TAINT; 114 taint_proper("Insecure $ENV{%s}%s", *e); 115 } 116 } 117 } 118