You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
173 lines
4.5 KiB
173 lines
4.5 KiB
5 years ago
|
Treat an ID of -1 as invalid since that means "no change".
|
||
|
|
Fixes CVE-2019-14287.
|
||
|
|
Found by Joe Vennix from Apple Information Security.
|
||
|
|
|
||
|
|
diff -r fcd7a6d8330e lib/util/strtoid.c
|
||
|
|
--- a/lib/util/strtoid.c Fri Jan 11 13:31:15 2019 -0700
|
||
|
|
+++ b/lib/util/strtoid.c Thu Oct 10 09:52:12 2019 -0600
|
||
|
|
@@ -1,5 +1,5 @@
|
||
|
|
/*
|
||
|
|
- * Copyright (c) 2013-2016 Todd C. Miller <Todd.Miller@sudo.ws>
|
||
|
|
+ * Copyright (c) 2013-2019 Todd C. Miller <Todd.Miller@sudo.ws>
|
||
|
|
*
|
||
|
|
* Permission to use, copy, modify, and distribute this software for any
|
||
|
|
* purpose with or without fee is hereby granted, provided that the above
|
||
|
|
@@ -47,6 +47,27 @@
|
||
|
|
#include "sudo_util.h"
|
||
|
|
|
||
|
|
/*
|
||
|
|
+ * Make sure that the ID ends with a valid separator char.
|
||
|
|
+ */
|
||
|
|
+static bool
|
||
|
|
+valid_separator(const char *p, const char *ep, const char *sep)
|
||
|
|
+{
|
||
|
|
+ bool valid = false;
|
||
|
|
+ debug_decl(valid_separator, SUDO_DEBUG_UTIL)
|
||
|
|
+
|
||
|
|
+ if (ep != p) {
|
||
|
|
+ /* check for valid separator (including '\0') */
|
||
|
|
+ if (sep == NULL)
|
||
|
|
+ sep = "";
|
||
|
|
+ do {
|
||
|
|
+ if (*ep == *sep)
|
||
|
|
+ valid = true;
|
||
|
|
+ } while (*sep++ != '\0');
|
||
|
|
+ }
|
||
|
|
+ debug_return_bool(valid);
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+/*
|
||
|
|
* Parse a uid/gid in string form.
|
||
|
|
* If sep is non-NULL, it contains valid separator characters (e.g. comma, space)
|
||
|
|
* If endp is non-NULL it is set to the next char after the ID.
|
||
|
|
@@ -60,38 +81,35 @@ sudo_strtoid_v1(const char *p, const cha
|
||
|
|
char *ep;
|
||
|
|
id_t ret = 0;
|
||
|
|
long long llval;
|
||
|
|
- bool valid = false;
|
||
|
|
debug_decl(sudo_strtoid, SUDO_DEBUG_UTIL)
|
||
|
|
|
||
|
|
/* skip leading space so we can pick up the sign, if any */
|
||
|
|
while (isspace((unsigned char)*p))
|
||
|
|
p++;
|
||
|
|
- if (sep == NULL)
|
||
|
|
- sep = "";
|
||
|
|
+
|
||
|
|
+ /* While id_t may be 64-bit signed, uid_t and gid_t are 32-bit unsigned. */
|
||
|
|
errno = 0;
|
||
|
|
llval = strtoll(p, &ep, 10);
|
||
|
|
- if (ep != p) {
|
||
|
|
- /* check for valid separator (including '\0') */
|
||
|
|
- do {
|
||
|
|
- if (*ep == *sep)
|
||
|
|
- valid = true;
|
||
|
|
- } while (*sep++ != '\0');
|
||
|
|
+ if ((errno == ERANGE && llval == LLONG_MAX) || llval > (id_t)UINT_MAX) {
|
||
|
|
+ errno = ERANGE;
|
||
|
|
+ if (errstr != NULL)
|
||
|
|
+ *errstr = N_("value too large");
|
||
|
|
+ goto done;
|
||
|
|
}
|
||
|
|
- if (!valid) {
|
||
|
|
+ if ((errno == ERANGE && llval == LLONG_MIN) || llval < INT_MIN) {
|
||
|
|
+ errno = ERANGE;
|
||
|
|
+ if (errstr != NULL)
|
||
|
|
+ *errstr = N_("value too small");
|
||
|
|
+ goto done;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ /* Disallow id -1, which means "no change". */
|
||
|
|
+ if (!valid_separator(p, ep, sep) || llval == -1 || llval == (id_t)UINT_MAX) {
|
||
|
|
if (errstr != NULL)
|
||
|
|
*errstr = N_("invalid value");
|
||
|
|
errno = EINVAL;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
- if (errno == ERANGE) {
|
||
|
|
- if (errstr != NULL) {
|
||
|
|
- if (llval == LLONG_MAX)
|
||
|
|
- *errstr = N_("value too large");
|
||
|
|
- else
|
||
|
|
- *errstr = N_("value too small");
|
||
|
|
- }
|
||
|
|
- goto done;
|
||
|
|
- }
|
||
|
|
ret = (id_t)llval;
|
||
|
|
if (errstr != NULL)
|
||
|
|
*errstr = NULL;
|
||
|
|
@@ -106,30 +124,15 @@ sudo_strtoid_v1(const char *p, const cha
|
||
|
|
{
|
||
|
|
char *ep;
|
||
|
|
id_t ret = 0;
|
||
|
|
- bool valid = false;
|
||
|
|
debug_decl(sudo_strtoid, SUDO_DEBUG_UTIL)
|
||
|
|
|
||
|
|
/* skip leading space so we can pick up the sign, if any */
|
||
|
|
while (isspace((unsigned char)*p))
|
||
|
|
p++;
|
||
|
|
- if (sep == NULL)
|
||
|
|
- sep = "";
|
||
|
|
+
|
||
|
|
errno = 0;
|
||
|
|
if (*p == '-') {
|
||
|
|
long lval = strtol(p, &ep, 10);
|
||
|
|
- if (ep != p) {
|
||
|
|
- /* check for valid separator (including '\0') */
|
||
|
|
- do {
|
||
|
|
- if (*ep == *sep)
|
||
|
|
- valid = true;
|
||
|
|
- } while (*sep++ != '\0');
|
||
|
|
- }
|
||
|
|
- if (!valid) {
|
||
|
|
- if (errstr != NULL)
|
||
|
|
- *errstr = N_("invalid value");
|
||
|
|
- errno = EINVAL;
|
||
|
|
- goto done;
|
||
|
|
- }
|
||
|
|
if ((errno == ERANGE && lval == LONG_MAX) || lval > INT_MAX) {
|
||
|
|
errno = ERANGE;
|
||
|
|
if (errstr != NULL)
|
||
|
|
@@ -142,28 +145,31 @@ sudo_strtoid_v1(const char *p, const cha
|
||
|
|
*errstr = N_("value too small");
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
- ret = (id_t)lval;
|
||
|
|
- } else {
|
||
|
|
- unsigned long ulval = strtoul(p, &ep, 10);
|
||
|
|
- if (ep != p) {
|
||
|
|
- /* check for valid separator (including '\0') */
|
||
|
|
- do {
|
||
|
|
- if (*ep == *sep)
|
||
|
|
- valid = true;
|
||
|
|
- } while (*sep++ != '\0');
|
||
|
|
- }
|
||
|
|
- if (!valid) {
|
||
|
|
+
|
||
|
|
+ /* Disallow id -1, which means "no change". */
|
||
|
|
+ if (!valid_separator(p, ep, sep) || lval == -1) {
|
||
|
|
if (errstr != NULL)
|
||
|
|
*errstr = N_("invalid value");
|
||
|
|
errno = EINVAL;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
+ ret = (id_t)lval;
|
||
|
|
+ } else {
|
||
|
|
+ unsigned long ulval = strtoul(p, &ep, 10);
|
||
|
|
if ((errno == ERANGE && ulval == ULONG_MAX) || ulval > UINT_MAX) {
|
||
|
|
errno = ERANGE;
|
||
|
|
if (errstr != NULL)
|
||
|
|
*errstr = N_("value too large");
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
+
|
||
|
|
+ /* Disallow id -1, which means "no change". */
|
||
|
|
+ if (!valid_separator(p, ep, sep) || ulval == UINT_MAX) {
|
||
|
|
+ if (errstr != NULL)
|
||
|
|
+ *errstr = N_("invalid value");
|
||
|
|
+ errno = EINVAL;
|
||
|
|
+ goto done;
|
||
|
|
+ }
|
||
|
|
ret = (id_t)ulval;
|
||
|
|
}
|
||
|
|
if (errstr != NULL)
|