| 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 | #include "perl.h" |
|---|
| 9 | |
|---|
| 10 | void |
|---|
| 11 | taint_proper(f, s) |
|---|
| 12 | const char *f; |
|---|
| 13 | char *s; |
|---|
| 14 | { |
|---|
| 15 | char *ug; |
|---|
| 16 | |
|---|
| 17 | DEBUG_u(PerlIO_printf(Perl_debug_log, |
|---|
| 18 | "%s %d %d %d\n", s, tainted, uid, euid)); |
|---|
| 19 | |
|---|
| 20 | if (tainted) { |
|---|
| 21 | if (euid != uid) |
|---|
| 22 | ug = " while running setuid"; |
|---|
| 23 | else if (egid != gid) |
|---|
| 24 | ug = " while running setgid"; |
|---|
| 25 | else |
|---|
| 26 | ug = " while running with -T switch"; |
|---|
| 27 | if (!unsafe) |
|---|
| 28 | croak(f, s, ug); |
|---|
| 29 | else if (dowarn) |
|---|
| 30 | warn(f, s, ug); |
|---|
| 31 | } |
|---|
| 32 | } |
|---|
| 33 | |
|---|
| 34 | void |
|---|
| 35 | taint_env() |
|---|
| 36 | { |
|---|
| 37 | SV** svp; |
|---|
| 38 | MAGIC* mg; |
|---|
| 39 | char** e; |
|---|
| 40 | static char* misc_env[] = { |
|---|
| 41 | "IFS", /* most shells' inter-field separators */ |
|---|
| 42 | "CDPATH", /* ksh dain bramage #1 */ |
|---|
| 43 | "ENV", /* ksh dain bramage #2 */ |
|---|
| 44 | "BASH_ENV", /* bash dain bramage -- I guess it's contagious */ |
|---|
| 45 | NULL |
|---|
| 46 | }; |
|---|
| 47 | |
|---|
| 48 | #ifdef VMS |
|---|
| 49 | int i = 0; |
|---|
| 50 | char name[10 + TYPE_DIGITS(int)] = "DCL$PATH"; |
|---|
| 51 | |
|---|
| 52 | while (1) { |
|---|
| 53 | if (i) |
|---|
| 54 | (void)sprintf(name,"DCL$PATH;%d", i); |
|---|
| 55 | svp = hv_fetch(GvHVn(envgv), name, strlen(name), FALSE); |
|---|
| 56 | if (!svp || *svp == &sv_undef) |
|---|
| 57 | break; |
|---|
| 58 | if (SvTAINTED(*svp)) { |
|---|
| 59 | TAINT; |
|---|
| 60 | taint_proper("Insecure %s%s", "$ENV{DCL$PATH}"); |
|---|
| 61 | } |
|---|
| 62 | if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) { |
|---|
| 63 | TAINT; |
|---|
| 64 | taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}"); |
|---|
| 65 | } |
|---|
| 66 | i++; |
|---|
| 67 | } |
|---|
| 68 | #endif /* VMS */ |
|---|
| 69 | |
|---|
| 70 | svp = hv_fetch(GvHVn(envgv),"PATH",4,FALSE); |
|---|
| 71 | if (svp && *svp) { |
|---|
| 72 | if (SvTAINTED(*svp)) { |
|---|
| 73 | TAINT; |
|---|
| 74 | taint_proper("Insecure %s%s", "$ENV{PATH}"); |
|---|
| 75 | } |
|---|
| 76 | if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) { |
|---|
| 77 | TAINT; |
|---|
| 78 | taint_proper("Insecure directory in %s%s", "$ENV{PATH}"); |
|---|
| 79 | } |
|---|
| 80 | } |
|---|
| 81 | |
|---|
| 82 | #ifndef VMS |
|---|
| 83 | /* tainted $TERM is okay if it contains no metachars */ |
|---|
| 84 | svp = hv_fetch(GvHVn(envgv),"TERM",4,FALSE); |
|---|
| 85 | if (svp && *svp && SvTAINTED(*svp)) { |
|---|
| 86 | bool was_tainted = tainted; |
|---|
| 87 | char *t = SvPV(*svp, na); |
|---|
| 88 | char *e = t + na; |
|---|
| 89 | tainted = was_tainted; |
|---|
| 90 | if (t < e && isALNUM(*t)) |
|---|
| 91 | t++; |
|---|
| 92 | while (t < e && (isALNUM(*t) || *t == '-' || *t == ':')) |
|---|
| 93 | t++; |
|---|
| 94 | if (t < e) { |
|---|
| 95 | TAINT; |
|---|
| 96 | taint_proper("Insecure $ENV{%s}%s", "TERM"); |
|---|
| 97 | } |
|---|
| 98 | } |
|---|
| 99 | #endif /* !VMS */ |
|---|
| 100 | |
|---|
| 101 | for (e = misc_env; *e; e++) { |
|---|
| 102 | svp = hv_fetch(GvHVn(envgv), *e, strlen(*e), FALSE); |
|---|
| 103 | if (svp && *svp != &sv_undef && SvTAINTED(*svp)) { |
|---|
| 104 | TAINT; |
|---|
| 105 | taint_proper("Insecure $ENV{%s}%s", *e); |
|---|
| 106 | } |
|---|
| 107 | } |
|---|
| 108 | } |
|---|
