114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
/*
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* "...we will have peace, when you and all your works have perished--and
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* the works of your dark master to whom you would deliver us. You are a
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* liar, Saruman, and a corrupter of men's hearts." --Theoden
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*/
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#include "EXTERN.h"
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#include "perl.h"
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void
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taint_proper(const char *f, char *s)
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{
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dTHR; /* just for taint */
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char *ug;
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DEBUG_u(PerlIO_printf(Perl_debug_log,
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"%s %d %d %d\n", s, PL_tainted, PL_uid, PL_euid));
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if (PL_tainted) {
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if (PL_euid != PL_uid)
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ug = " while running setuid";
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else if (PL_egid != PL_gid)
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ug = " while running setgid";
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else
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ug = " while running with -T switch";
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if (!PL_unsafe)
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croak(f, s, ug);
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else if (PL_dowarn)
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warn(f, s, ug);
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}
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}
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void
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taint_env(void)
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{
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SV** svp;
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MAGIC* mg;
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char** e;
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static char* misc_env[] = {
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"IFS", /* most shells' inter-field separators */
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"CDPATH", /* ksh dain bramage #1 */
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"ENV", /* ksh dain bramage #2 */
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"BASH_ENV", /* bash dain bramage -- I guess it's contagious */
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NULL
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};
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#ifdef VMS
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int i = 0;
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char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
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while (1) {
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if (i)
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(void)sprintf(name,"DCL$PATH;%d", i);
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svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE);
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if (!svp || *svp == &PL_sv_undef)
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break;
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if (SvTAINTED(*svp)) {
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dTHR;
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TAINT;
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taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
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}
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if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
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dTHR;
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TAINT;
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taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
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}
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i++;
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}
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#endif /* VMS */
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svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE);
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if (svp && *svp) {
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if (SvTAINTED(*svp)) {
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dTHR;
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TAINT;
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taint_proper("Insecure %s%s", "$ENV{PATH}");
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}
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if ((mg = mg_find(*svp, 'e')) && MgTAINTEDDIR(mg)) {
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dTHR;
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TAINT;
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taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
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}
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}
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#ifndef VMS
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/* tainted $TERM is okay if it contains no metachars */
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svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE);
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if (svp && *svp && SvTAINTED(*svp)) {
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dTHR; /* just for taint */
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bool was_tainted = PL_tainted;
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char *t = SvPV(*svp, PL_na);
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char *e = t + PL_na;
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PL_tainted = was_tainted;
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if (t < e && isALNUM(*t))
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t++;
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while (t < e && (isALNUM(*t) || *t == '-' || *t == ':'))
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t++;
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if (t < e) {
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TAINT;
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taint_proper("Insecure $ENV{%s}%s", "TERM");
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}
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}
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#endif /* !VMS */
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for (e = misc_env; *e; e++) {
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svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
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if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
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dTHR; /* just for taint */
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TAINT;
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taint_proper("Insecure $ENV{%s}%s", *e);
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}
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}
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}
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