[10723] | 1 | /* |
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| 2 | * "...we will have peace, when you and all your works have perished--and |
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| 3 | * the works of your dark master to whom you would deliver us. You are a |
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| 4 | * liar, Saruman, and a corrupter of men's hearts." --Theoden |
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| 5 | */ |
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| 6 | |
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| 7 | #include "EXTERN.h" |
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[14544] | 8 | #define PERL_IN_TAINT_C |
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[10723] | 9 | #include "perl.h" |
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| 10 | |
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| 11 | void |
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[14544] | 12 | Perl_taint_proper(pTHX_ const char *f, const char *s) |
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[10723] | 13 | { |
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[14544] | 14 | dTHR; /* just for taint */ |
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[10723] | 15 | char *ug; |
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| 16 | |
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[14544] | 17 | #ifdef HAS_SETEUID |
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[10723] | 18 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
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[14544] | 19 | "%s %d %"Uid_t_f" %"Uid_t_f"\n", s, PL_tainted, PL_uid, PL_euid)); |
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| 20 | #endif |
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[10723] | 21 | |
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[14544] | 22 | if (PL_tainted) { |
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| 23 | if (!f) |
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| 24 | f = PL_no_security; |
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| 25 | if (PL_euid != PL_uid) |
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[10723] | 26 | ug = " while running setuid"; |
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[14544] | 27 | else if (PL_egid != PL_gid) |
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[10723] | 28 | ug = " while running setgid"; |
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| 29 | else |
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| 30 | ug = " while running with -T switch"; |
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[14544] | 31 | if (!PL_unsafe) |
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| 32 | Perl_croak(aTHX_ f, s, ug); |
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| 33 | else if (ckWARN(WARN_TAINT)) |
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| 34 | Perl_warner(aTHX_ WARN_TAINT, f, s, ug); |
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[10723] | 35 | } |
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| 36 | } |
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| 37 | |
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| 38 | void |
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[14544] | 39 | Perl_taint_env(pTHX) |
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[10723] | 40 | { |
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| 41 | SV** svp; |
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| 42 | MAGIC* mg; |
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| 43 | char** e; |
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| 44 | static char* misc_env[] = { |
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| 45 | "IFS", /* most shells' inter-field separators */ |
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| 46 | "CDPATH", /* ksh dain bramage #1 */ |
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| 47 | "ENV", /* ksh dain bramage #2 */ |
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| 48 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ |
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| 49 | NULL |
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| 50 | }; |
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| 51 | |
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[14544] | 52 | if (!PL_envgv) |
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| 53 | return; |
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| 54 | |
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[10723] | 55 | #ifdef VMS |
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[14544] | 56 | { |
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[10723] | 57 | int i = 0; |
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| 58 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
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| 59 | |
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| 60 | while (1) { |
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| 61 | if (i) |
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| 62 | (void)sprintf(name,"DCL$PATH;%d", i); |
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[14544] | 63 | svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE); |
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| 64 | if (!svp || *svp == &PL_sv_undef) |
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[10723] | 65 | break; |
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| 66 | if (SvTAINTED(*svp)) { |
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[14544] | 67 | dTHR; |
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[10723] | 68 | TAINT; |
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| 69 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); |
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| 70 | } |
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| 71 | if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) { |
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[14544] | 72 | dTHR; |
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[10723] | 73 | TAINT; |
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| 74 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); |
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| 75 | } |
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| 76 | i++; |
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| 77 | } |
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[14544] | 78 | } |
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[10723] | 79 | #endif /* VMS */ |
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| 80 | |
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[14544] | 81 | svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE); |
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[10723] | 82 | if (svp && *svp) { |
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| 83 | if (SvTAINTED(*svp)) { |
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[14544] | 84 | dTHR; |
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[10723] | 85 | TAINT; |
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| 86 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
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| 87 | } |
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| 88 | if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) { |
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[14544] | 89 | dTHR; |
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[10723] | 90 | TAINT; |
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| 91 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); |
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| 92 | } |
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| 93 | } |
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| 94 | |
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| 95 | #ifndef VMS |
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| 96 | /* tainted $TERM is okay if it contains no metachars */ |
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[14544] | 97 | svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE); |
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[10723] | 98 | if (svp && *svp && SvTAINTED(*svp)) { |
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[14544] | 99 | dTHR; /* just for taint */ |
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| 100 | STRLEN n_a; |
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| 101 | bool was_tainted = PL_tainted; |
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| 102 | char *t = SvPV(*svp, n_a); |
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| 103 | char *e = t + n_a; |
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| 104 | PL_tainted = was_tainted; |
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[10723] | 105 | if (t < e && isALNUM(*t)) |
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| 106 | t++; |
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| 107 | while (t < e && (isALNUM(*t) || *t == '-' || *t == ':')) |
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| 108 | t++; |
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| 109 | if (t < e) { |
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| 110 | TAINT; |
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| 111 | taint_proper("Insecure $ENV{%s}%s", "TERM"); |
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| 112 | } |
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| 113 | } |
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| 114 | #endif /* !VMS */ |
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| 115 | |
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| 116 | for (e = misc_env; *e; e++) { |
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[14544] | 117 | svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE); |
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| 118 | if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) { |
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| 119 | dTHR; /* just for taint */ |
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[10723] | 120 | TAINT; |
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| 121 | taint_proper("Insecure $ENV{%s}%s", *e); |
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| 122 | } |
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| 123 | } |
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| 124 | } |
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