/* taint.c
*
- * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999,
- * 2000, 2001, 2002, by Larry Wall and others
+ * Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
+ * 2002, 2003, 2004, 2005, 2006, 2007, 2008 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*/
/*
- * "...we will have peace, when you and all your works have perished--and
- * the works of your dark master to whom you would deliver us. You are a
- * liar, Saruman, and a corrupter of men's hearts." --Theoden
+ * '...we will have peace, when you and all your works have perished--and
+ * the works of your dark master to whom you would deliver us. You are a
+ * liar, Saruman, and a corrupter of men's hearts.' --Théoden
+ *
+ * [p.580 of _The Lord of the Rings_, III/x: "The Voice of Saruman"]
+ */
+
+/* This file contains a few functions for handling data tainting in Perl
*/
#include "EXTERN.h"
#define PERL_IN_TAINT_C
#include "perl.h"
+/*
+=for apidoc taint_proper
+
+Implements the L</TAINT_PROPER> macro, which you should generally use instead.
+
+=cut
+*/
+
void
-Perl_taint_proper(pTHX_ const char *f, const char *s)
+Perl_taint_proper(pTHX_ const char *f, const char *const s)
{
- char *ug;
+ /* Don't use directly; instead use TAINT_PROPER
+ *
+ * Output a tainting violation, croaking unless we're just to warn.
+ * '_proper' is just to throw you off the scent */
#if defined(HAS_SETEUID) && defined(DEBUGGING)
-# if Uid_t_size == 1
- {
- UV uid = PL_uid;
- UV euid = PL_euid;
+ PERL_ARGS_ASSERT_TAINT_PROPER;
- DEBUG_u(PerlIO_printf(Perl_debug_log,
- "%s %d %"UVuf" %"UVuf"\n",
- s, PL_tainted, uid, euid));
- }
-# else
{
- IV uid = PL_uid;
- IV euid = PL_euid;
+ const Uid_t uid = PerlProc_getuid();
+ const Uid_t euid = PerlProc_geteuid();
- DEBUG_u(PerlIO_printf(Perl_debug_log,
- "%s %d %"IVdf" %"IVdf"\n",
- s, PL_tainted, uid, euid));
+#if Uid_t_sign == 1 /* uid_t is unsigned. */
+ DEBUG_u(PerlIO_printf(Perl_debug_log,
+ "%s %d %" UVuf " %" UVuf "\n",
+ s, TAINT_get, (UV)uid, (UV)euid));
+#else /* uid_t is signed (Uid_t_sign == -1), or don't know. */
+ DEBUG_u(PerlIO_printf(Perl_debug_log,
+ "%s %d %" IVdf " %" IVdf "\n",
+ s, TAINT_get, (IV)uid, (IV)euid));
+#endif
}
-# endif
#endif
- if (PL_tainted) {
- if (!f)
- f = PL_no_security;
- if (PL_euid != PL_uid)
- ug = " while running setuid";
- else if (PL_egid != PL_gid)
- ug = " while running setgid";
- else if (PL_taint_warn)
+ if (TAINT_get) {
+ const char *ug;
+
+ if (!f)
+ f = PL_no_security;
+ if (PerlProc_getuid() != PerlProc_geteuid())
+ ug = " while running setuid";
+ else if (PerlProc_getgid() != PerlProc_getegid())
+ ug = " while running setgid";
+ else if (TAINT_WARN_get)
ug = " while running with -t switch";
else
- ug = " while running with -T switch";
- if (PL_unsafe || PL_taint_warn) {
- if(ckWARN(WARN_TAINT))
- Perl_warner(aTHX_ packWARN(WARN_TAINT), f, s, ug);
+ ug = " while running with -T switch";
+
+ /* XXX because taint_proper adds extra format args, we can't
+ * get the caller to check properly; so we just silence the warning
+ * and hope the callers aren't naughty */
+ GCC_DIAG_IGNORE_STMT(-Wformat-nonliteral);
+ if (PL_unsafe || TAINT_WARN_get) {
+ Perl_ck_warner_d(aTHX_ packWARN(WARN_TAINT), f, s, ug);
}
else {
Perl_croak(aTHX_ f, s, ug);
}
+ GCC_DIAG_RESTORE_STMT;
+
}
}
+/*
+=for apidoc taint_env
+
+Implements the L</TAINT_ENV> macro, which you should generally use instead.
+
+=cut
+*/
void
Perl_taint_env(pTHX)
{
+ /* Don't use directly; instead use TAINT_ENV */
+
SV** svp;
- MAGIC* mg;
- char** e;
- static char* misc_env[] = {
- "IFS", /* most shells' inter-field separators */
- "CDPATH", /* ksh dain bramage #1 */
- "ENV", /* ksh dain bramage #2 */
- "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
- NULL
+ const char* const *e;
+ static const char* const misc_env[] = {
+ "IFS", /* most shells' inter-field separators */
+ "CDPATH", /* ksh dain bramage #1 */
+ "ENV", /* ksh dain bramage #2 */
+ "BASH_ENV", /* bash dain bramage -- I guess it's contagious */
+#ifdef WIN32
+ "PERL5SHELL", /* used for system() on Windows */
+#endif
+ NULL
};
/* Don't bother if there's no *ENV glob */
if (!PL_envgv)
- return;
- /* If there's no %ENV hash of if it's not magical, croak, because
+ return;
+ /* If there's no %ENV hash or if it's not magical, croak, because
* it probably doesn't reflect the actual environment */
if (!GvHV(PL_envgv) || !(SvRMAGICAL(GvHV(PL_envgv))
- && mg_find((SV*)GvHV(PL_envgv), PERL_MAGIC_env))) {
- bool was_tainted = PL_tainted;
- char *name = GvENAME(PL_envgv);
- PL_tainted = TRUE;
- if (strEQ(name,"ENV"))
- /* hash alias */
- taint_proper("%%ENV is aliased to %s%s", "another variable");
- else
- /* glob alias: report it in the error message */
- taint_proper("%%ENV is aliased to %%%s%s", name);
- /* this statement is reached under -t or -U */
- PL_tainted = was_tainted;
+ && mg_find((const SV *)GvHV(PL_envgv), PERL_MAGIC_env))) {
+ const bool was_tainted = TAINT_get;
+ const char * const name = GvENAME(PL_envgv);
+ TAINT;
+ if (strEQ(name,"ENV"))
+ /* hash alias */
+ taint_proper("%%ENV is aliased to %s%s", "another variable");
+ else
+ /* glob alias: report it in the error message */
+ taint_proper("%%ENV is aliased to %%%s%s", name);
+ /* this statement is reached under -t or -U */
+ TAINT_set(was_tainted);
+#ifdef NO_TAINT_SUPPORT
+ PERL_UNUSED_VAR(was_tainted);
+#endif
}
#ifdef VMS
{
int i = 0;
char name[10 + TYPE_DIGITS(int)] = "DCL$PATH";
+ STRLEN len = 8; /* strlen(name) */
while (1) {
- if (i)
- (void)sprintf(name,"DCL$PATH;%d", i);
- svp = hv_fetch(GvHVn(PL_envgv), name, strlen(name), FALSE);
- if (!svp || *svp == &PL_sv_undef)
- break;
- if (SvTAINTED(*svp)) {
- TAINT;
- taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
- }
- if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
- TAINT;
- taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
- }
- i++;
+ MAGIC* mg;
+ if (i)
+ len = my_snprintf(name, sizeof name, "DCL$PATH;%d", i);
+ svp = hv_fetch(GvHVn(PL_envgv), name, len, FALSE);
+ if (!svp || *svp == &PL_sv_undef)
+ break;
+ if (SvTAINTED(*svp)) {
+ TAINT;
+ taint_proper("Insecure %s%s", "$ENV{DCL$PATH}");
+ }
+ if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
+ TAINT;
+ taint_proper("Insecure directory in %s%s", "$ENV{DCL$PATH}");
+ }
+ i++;
}
}
#endif /* VMS */
- svp = hv_fetch(GvHVn(PL_envgv),"PATH",4,FALSE);
+ svp = hv_fetchs(GvHVn(PL_envgv),"PATH",FALSE);
if (svp && *svp) {
- if (SvTAINTED(*svp)) {
- TAINT;
- taint_proper("Insecure %s%s", "$ENV{PATH}");
- }
- if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
- TAINT;
- taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
- }
+ MAGIC* mg;
+ if (SvTAINTED(*svp)) {
+ TAINT;
+ taint_proper("Insecure %s%s", "$ENV{PATH}");
+ }
+ if ((mg = mg_find(*svp, PERL_MAGIC_envelem)) && MgTAINTEDDIR(mg)) {
+ TAINT;
+ taint_proper("Insecure directory in %s%s", "$ENV{PATH}");
+ }
}
#ifndef VMS
/* tainted $TERM is okay if it contains no metachars */
- svp = hv_fetch(GvHVn(PL_envgv),"TERM",4,FALSE);
+ svp = hv_fetchs(GvHVn(PL_envgv),"TERM",FALSE);
if (svp && *svp && SvTAINTED(*svp)) {
- STRLEN n_a;
- bool was_tainted = PL_tainted;
- char *t = SvPV(*svp, n_a);
- char *e = t + n_a;
- PL_tainted = was_tainted;
- if (t < e && isALNUM(*t))
- t++;
- while (t < e && (isALNUM(*t) || strchr("-_.+", *t)))
- t++;
- if (t < e) {
- TAINT;
- taint_proper("Insecure $ENV{%s}%s", "TERM");
- }
+ STRLEN len;
+ const bool was_tainted = TAINT_get;
+ const char *t = SvPV_const(*svp, len);
+ const char * const e = t + len;
+
+ TAINT_set(was_tainted);
+#ifdef NO_TAINT_SUPPORT
+ PERL_UNUSED_VAR(was_tainted);
+#endif
+ if (t < e && isWORDCHAR(*t))
+ t++;
+ while (t < e && (isWORDCHAR(*t) || memCHRs("-_.+", *t)))
+ t++;
+ if (t < e) {
+ TAINT;
+ taint_proper("Insecure $ENV{%s}%s", "TERM");
+ }
}
#endif /* !VMS */
for (e = misc_env; *e; e++) {
- svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
- if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
- TAINT;
- taint_proper("Insecure $ENV{%s}%s", *e);
- }
+ SV * const * const svp = hv_fetch(GvHVn(PL_envgv), *e, strlen(*e), FALSE);
+ if (svp && *svp != &PL_sv_undef && SvTAINTED(*svp)) {
+ TAINT;
+ taint_proper("Insecure $ENV{%s}%s", *e);
+ }
}
}
+
+/*
+ * ex: set ts=8 sts=4 sw=4 et:
+ */
https://perl5.git.perl.org / perl5.git / blobdiff