Mixing
Interacting with a file in PHP causes second interaction to just not happen
This is probably going to have a simple answer, but here is my problem. I am currently writing a weak permissions filesystem, I want the user to not have to do any authentication checks if the given file is empty (this is the $filedir variable). I can successfully check if this file is empty, however, if I try to read anything else (shown by file_get_contents(data.data)), it just simply will not work. There are no errors, but the condition will always evaluate as true. I have been stuck on this forever, and I'm still new to PHP, so hopefully, someone can help me out here!
Thank you in advance!
Karl
<?php
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/' . $_SESSION['user_name'] . '/a' . '/' . $_POST['dataName'];
if ($_POST['c'] == "true") {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/a' . '/' . $_POST['dataName'];
}elseif ($_POST['c'] == "") {
// code...
}else {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is' . '/' . $_POST['c'] . '/a' . '/' . $_POST['dataName'];
}
**//THIS IS THE FIRST CONDITION THAT, WHEN IMPLEMENTED, CAUSES THE SECOND CONDITION TO ALWAYS EVALUATE TO TRUE FOR SOME REASON**
$pass = false;
if (readfile($filedir) == 0) {
$pass = true;
echo "check";
}else {
echo "pass";
}
if ($_POST['auth'] == "1") {
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
// throw new Exception("Incorrect auth token", 1);
if ($_POST['token'] == $cue) {
$_SESSION['apiauth'] == $_POST['token'];
}elseif (file_get_contents($filedir) == '') {
$_SESSION['apiauth'] == '';
}else {
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}elseif ($_POST['permissions'] == true) {
addLog($fn,'Permissions were changed', 'DATABASE-PERMISSIONS', null, null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
if ($_POST['revoke'] == true && ($_POST['user'] != 'u' || ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm' || $_POST['user'] == null))) {
throw new Exception("Cannot revoke access without proper format", 1);
}
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
**//BELOW THIS IS THE SECOND CONDITION THAT FAILS IF THE FIRST CONDITION IS IMPLEMENTED, AND WORKS FINE IF ITS LEFT OUT**
if ($cue === $_POST['token'] || $cue === $_SESSION['apiauth'] || $pass) {
if ($_POST['type'] == 'r') {
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/a/dir/path');
if ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '**'.$_POST['user'].'**');
fclose($cue);
}elseif ($_POST['user'] == 'u') {
$d = file_get_contents($_POST['dataName'].".secure");
if ($d == '**a**' || $d == '**e**' || $d == '**m**') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '');
fclose($cue);
}
if ($_POST['revoke'] == true) {
$writein = str_replace($_POST['name']."||","",file_get_contents($_POST['dataName'].".secure"));
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, $writein);
fclose($cue);
}else {
if (strpos(file_get_contents($_POST['dataName'].".secure"), $_POST['name']) !== false) {
// throw new Exception("User already exists in permission slot", 1);
}else{
$cue = fopen($_POST['dataName'].".data", "a");
fwrite($cue, $_POST['name'].'||');
fclose($cue);
}
}
}else {
throw new Exception("Invalid parameter.", 1);
}
}
}else {
addLog($fn,'Permission changed was blocked due to incorrect token', 'DATABASE-PERMISSIONS', 'danger', null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}
?>
php filesystems
asked Nov 19 '18 at 16:37
Karl Schmidt
83
add a comment |
This is probably going to have a simple answer, but here is my problem. I am currently writing a weak permissions filesystem, I want the user to not have to do any authentication checks if the given file is empty (this is the $filedir variable). I can successfully check if this file is empty, however, if I try to read anything else (shown by file_get_contents(data.data)), it just simply will not work. There are no errors, but the condition will always evaluate as true. I have been stuck on this forever, and I'm still new to PHP, so hopefully, someone can help me out here!
Thank you in advance!
Karl
<?php
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/' . $_SESSION['user_name'] . '/a' . '/' . $_POST['dataName'];
if ($_POST['c'] == "true") {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/a' . '/' . $_POST['dataName'];
}elseif ($_POST['c'] == "") {
// code...
}else {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is' . '/' . $_POST['c'] . '/a' . '/' . $_POST['dataName'];
}
**//THIS IS THE FIRST CONDITION THAT, WHEN IMPLEMENTED, CAUSES THE SECOND CONDITION TO ALWAYS EVALUATE TO TRUE FOR SOME REASON**
$pass = false;
if (readfile($filedir) == 0) {
$pass = true;
echo "check";
}else {
echo "pass";
}
if ($_POST['auth'] == "1") {
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
// throw new Exception("Incorrect auth token", 1);
if ($_POST['token'] == $cue) {
$_SESSION['apiauth'] == $_POST['token'];
}elseif (file_get_contents($filedir) == '') {
$_SESSION['apiauth'] == '';
}else {
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}elseif ($_POST['permissions'] == true) {
addLog($fn,'Permissions were changed', 'DATABASE-PERMISSIONS', null, null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
if ($_POST['revoke'] == true && ($_POST['user'] != 'u' || ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm' || $_POST['user'] == null))) {
throw new Exception("Cannot revoke access without proper format", 1);
}
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
**//BELOW THIS IS THE SECOND CONDITION THAT FAILS IF THE FIRST CONDITION IS IMPLEMENTED, AND WORKS FINE IF ITS LEFT OUT**
if ($cue === $_POST['token'] || $cue === $_SESSION['apiauth'] || $pass) {
if ($_POST['type'] == 'r') {
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/a/dir/path');
if ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '**'.$_POST['user'].'**');
fclose($cue);
}elseif ($_POST['user'] == 'u') {
$d = file_get_contents($_POST['dataName'].".secure");
if ($d == '**a**' || $d == '**e**' || $d == '**m**') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '');
fclose($cue);
}
if ($_POST['revoke'] == true) {
$writein = str_replace($_POST['name']."||","",file_get_contents($_POST['dataName'].".secure"));
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, $writein);
fclose($cue);
}else {
if (strpos(file_get_contents($_POST['dataName'].".secure"), $_POST['name']) !== false) {
// throw new Exception("User already exists in permission slot", 1);
}else{
$cue = fopen($_POST['dataName'].".data", "a");
fwrite($cue, $_POST['name'].'||');
fclose($cue);
}
}
}else {
throw new Exception("Invalid parameter.", 1);
}
}
}else {
addLog($fn,'Permission changed was blocked due to incorrect token', 'DATABASE-PERMISSIONS', 'danger', null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}
?>
php filesystems
asked Nov 19 '18 at 16:37
Karl Schmidt
83
add a comment |
This is probably going to have a simple answer, but here is my problem. I am currently writing a weak permissions filesystem, I want the user to not have to do any authentication checks if the given file is empty (this is the $filedir variable). I can successfully check if this file is empty, however, if I try to read anything else (shown by file_get_contents(data.data)), it just simply will not work. There are no errors, but the condition will always evaluate as true. I have been stuck on this forever, and I'm still new to PHP, so hopefully, someone can help me out here!
Thank you in advance!
Karl
<?php
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/' . $_SESSION['user_name'] . '/a' . '/' . $_POST['dataName'];
if ($_POST['c'] == "true") {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/a' . '/' . $_POST['dataName'];
}elseif ($_POST['c'] == "") {
// code...
}else {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is' . '/' . $_POST['c'] . '/a' . '/' . $_POST['dataName'];
}
**//THIS IS THE FIRST CONDITION THAT, WHEN IMPLEMENTED, CAUSES THE SECOND CONDITION TO ALWAYS EVALUATE TO TRUE FOR SOME REASON**
$pass = false;
if (readfile($filedir) == 0) {
$pass = true;
echo "check";
}else {
echo "pass";
}
if ($_POST['auth'] == "1") {
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
// throw new Exception("Incorrect auth token", 1);
if ($_POST['token'] == $cue) {
$_SESSION['apiauth'] == $_POST['token'];
}elseif (file_get_contents($filedir) == '') {
$_SESSION['apiauth'] == '';
}else {
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}elseif ($_POST['permissions'] == true) {
addLog($fn,'Permissions were changed', 'DATABASE-PERMISSIONS', null, null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
if ($_POST['revoke'] == true && ($_POST['user'] != 'u' || ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm' || $_POST['user'] == null))) {
throw new Exception("Cannot revoke access without proper format", 1);
}
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
**//BELOW THIS IS THE SECOND CONDITION THAT FAILS IF THE FIRST CONDITION IS IMPLEMENTED, AND WORKS FINE IF ITS LEFT OUT**
if ($cue === $_POST['token'] || $cue === $_SESSION['apiauth'] || $pass) {
if ($_POST['type'] == 'r') {
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/a/dir/path');
if ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '**'.$_POST['user'].'**');
fclose($cue);
}elseif ($_POST['user'] == 'u') {
$d = file_get_contents($_POST['dataName'].".secure");
if ($d == '**a**' || $d == '**e**' || $d == '**m**') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '');
fclose($cue);
}
if ($_POST['revoke'] == true) {
$writein = str_replace($_POST['name']."||","",file_get_contents($_POST['dataName'].".secure"));
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, $writein);
fclose($cue);
}else {
if (strpos(file_get_contents($_POST['dataName'].".secure"), $_POST['name']) !== false) {
// throw new Exception("User already exists in permission slot", 1);
}else{
$cue = fopen($_POST['dataName'].".data", "a");
fwrite($cue, $_POST['name'].'||');
fclose($cue);
}
}
}else {
throw new Exception("Invalid parameter.", 1);
}
}
}else {
addLog($fn,'Permission changed was blocked due to incorrect token', 'DATABASE-PERMISSIONS', 'danger', null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}
?>
php filesystems
asked Nov 19 '18 at 16:37
Karl Schmidt
83
This is probably going to have a simple answer, but here is my problem. I am currently writing a weak permissions filesystem, I want the user to not have to do any authentication checks if the given file is empty (this is the $filedir variable). I can successfully check if this file is empty, however, if I try to read anything else (shown by file_get_contents(data.data)), it just simply will not work. There are no errors, but the condition will always evaluate as true. I have been stuck on this forever, and I'm still new to PHP, so hopefully, someone can help me out here!
Thank you in advance!
Karl
<?php
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/' . $_SESSION['user_name'] . '/a' . '/' . $_POST['dataName'];
if ($_POST['c'] == "true") {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is/a' . '/' . $_POST['dataName'];
}elseif ($_POST['c'] == "") {
// code...
}else {
$filedir = substr(getcwd(), 0, strpos(getcwd(), "this")).'this/is' . '/' . $_POST['c'] . '/a' . '/' . $_POST['dataName'];
}
**//THIS IS THE FIRST CONDITION THAT, WHEN IMPLEMENTED, CAUSES THE SECOND CONDITION TO ALWAYS EVALUATE TO TRUE FOR SOME REASON**
$pass = false;
if (readfile($filedir) == 0) {
$pass = true;
echo "check";
}else {
echo "pass";
}
if ($_POST['auth'] == "1") {
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
// throw new Exception("Incorrect auth token", 1);
if ($_POST['token'] == $cue) {
$_SESSION['apiauth'] == $_POST['token'];
}elseif (file_get_contents($filedir) == '') {
$_SESSION['apiauth'] == '';
}else {
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}elseif ($_POST['permissions'] == true) {
addLog($fn,'Permissions were changed', 'DATABASE-PERMISSIONS', null, null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
if ($_POST['revoke'] == true && ($_POST['user'] != 'u' || ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm' || $_POST['user'] == null))) {
throw new Exception("Cannot revoke access without proper format", 1);
}
$prev = getcwd();
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/adir');
$cue = file_get_contents("data.data");
**//BELOW THIS IS THE SECOND CONDITION THAT FAILS IF THE FIRST CONDITION IS IMPLEMENTED, AND WORKS FINE IF ITS LEFT OUT**
if ($cue === $_POST['token'] || $cue === $_SESSION['apiauth'] || $pass) {
if ($_POST['type'] == 'r') {
chdir(substr(getcwd(), 0, strpos(getcwd(), "this")) . 'this/is/a/dir/path');
if ($_POST['user'] == 'e' || $_POST['user'] == 'a' || $_POST['user'] == 'm') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '**'.$_POST['user'].'**');
fclose($cue);
}elseif ($_POST['user'] == 'u') {
$d = file_get_contents($_POST['dataName'].".secure");
if ($d == '**a**' || $d == '**e**' || $d == '**m**') {
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, '');
fclose($cue);
}
if ($_POST['revoke'] == true) {
$writein = str_replace($_POST['name']."||","",file_get_contents($_POST['dataName'].".secure"));
$cue = fopen($_POST['dataName'].".data", "w");
fwrite($cue, $writein);
fclose($cue);
}else {
if (strpos(file_get_contents($_POST['dataName'].".secure"), $_POST['name']) !== false) {
// throw new Exception("User already exists in permission slot", 1);
}else{
$cue = fopen($_POST['dataName'].".data", "a");
fwrite($cue, $_POST['name'].'||');
fclose($cue);
}
}
}else {
throw new Exception("Invalid parameter.", 1);
}
}
}else {
addLog($fn,'Permission changed was blocked due to incorrect token', 'DATABASE-PERMISSIONS', 'danger', null, 'Target: '. $_POST['dataName'] . 'Change: {Type: '.$_POST['type'].', Usertype: '.$_POST['user'].', Name: '.$_POST['name']);
throw new Exception("Incorrect auth token", 1);
}
chdir($prev);
}
?>
php filesystems
php filesystems
asked Nov 19 '18 at 16:37
Karl Schmidt
83
asked Nov 19 '18 at 16:37
Karl Schmidt
83
asked Nov 19 '18 at 16:37
Karl Schmidt
83
asked Nov 19 '18 at 16:37
Karl Schmidt
83
asked Nov 19 '18 at 16:37
Karl Schmidt
83
83
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
From the manual
Returns the number of bytes read from the file. If an error occurs,
FALSE is returned and unless the function was called as @readfile(),
an error message is printed.
You make a weak comparison on this line
if (readfile($filedir) == 0) {
}
If the call fails false == 0 will evaluate to true, because the int value will evaluate to false. false == false is true. So use strict comparison operator === and try to figure out why the call fails anyway.
if (readfile($filedir) === 0) {
}
or use, if intended if the call succeded, and returned anything (but also 0)
if (readfile($filedir) !== false) {
}
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
From the manual
Returns the number of bytes read from the file. If an error occurs,
FALSE is returned and unless the function was called as @readfile(),
an error message is printed.
You make a weak comparison on this line
if (readfile($filedir) == 0) {
}
If the call fails false == 0 will evaluate to true, because the int value will evaluate to false. false == false is true. So use strict comparison operator === and try to figure out why the call fails anyway.
if (readfile($filedir) === 0) {
}
or use, if intended if the call succeded, and returned anything (but also 0)
if (readfile($filedir) !== false) {
}
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
add a comment |
From the manual
Returns the number of bytes read from the file. If an error occurs,
FALSE is returned and unless the function was called as @readfile(),
an error message is printed.
You make a weak comparison on this line
if (readfile($filedir) == 0) {
}
If the call fails false == 0 will evaluate to true, because the int value will evaluate to false. false == false is true. So use strict comparison operator === and try to figure out why the call fails anyway.
if (readfile($filedir) === 0) {
}
or use, if intended if the call succeded, and returned anything (but also 0)
if (readfile($filedir) !== false) {
}
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
add a comment |
From the manual
Returns the number of bytes read from the file. If an error occurs,
FALSE is returned and unless the function was called as @readfile(),
an error message is printed.
You make a weak comparison on this line
if (readfile($filedir) == 0) {
}
If the call fails false == 0 will evaluate to true, because the int value will evaluate to false. false == false is true. So use strict comparison operator === and try to figure out why the call fails anyway.
if (readfile($filedir) === 0) {
}
or use, if intended if the call succeded, and returned anything (but also 0)
if (readfile($filedir) !== false) {
}
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
From the manual
Returns the number of bytes read from the file. If an error occurs,
FALSE is returned and unless the function was called as @readfile(),
an error message is printed.
You make a weak comparison on this line
if (readfile($filedir) == 0) {
}
If the call fails false == 0 will evaluate to true, because the int value will evaluate to false. false == false is true. So use strict comparison operator === and try to figure out why the call fails anyway.
if (readfile($filedir) === 0) {
}
or use, if intended if the call succeded, and returned anything (but also 0)
if (readfile($filedir) !== false) {
}
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
answered Nov 19 '18 at 17:05
Philipp Palmtag
1,10921217
1,10921217
add a comment |
add a comment |
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StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
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Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
