| | 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, PERL_MAGIC_envelem)) && 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", "$ENV{PATH}"); |
| | 83 | } |
| | 84 | if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) { |
| | 85 | TAINT; |
| | 86 | taint_proper("Insecure directory in %s%s", "$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 | } |
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