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CLI server: prevent using symlinks to escape the docroot #23975
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DanielEScherzer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| --TEST-- | ||
| Built-in web server docroot limit can be bypassed with symlinks | ||
| --SKIPIF-- | ||
| <?php | ||
| include "skipif.inc"; | ||
| ?> | ||
| --FILE-- | ||
| <?php | ||
| include "php_cli_server.inc"; | ||
|
|
||
| $server = php_cli_server_start(null, null); | ||
| $docRoot = $server->docRoot; | ||
|
|
||
| file_put_contents($docRoot . '/public.txt', 'Public file contents'); | ||
|
|
||
| $tmpFile = tempnam(sys_get_temp_dir(), "php_cli_server_024"); | ||
| @unlink($tmpFile); | ||
| mkdir($tmpFile); | ||
| file_put_contents($tmpFile . '/secret-config.txt', 'Secret credentials, NOT PUBLIC'); | ||
|
|
||
| var_dump(symlink($tmpFile, $docRoot . '/escape')); | ||
| var_dump(symlink($tmpFile . '/secret-config.txt', $docRoot . '/leak.txt')); | ||
|
|
||
| file_put_contents($docRoot . '-neighbor.txt', 'More secret credentials'); | ||
| var_dump(symlink($docRoot . '-neighbor.txt', $docRoot . '/neighbor.txt')); | ||
|
|
||
| $targets = [ | ||
| "/public.txt", | ||
| "/../traversal.txt", | ||
| "/leak.txt", | ||
| "/escape/secret-config.txt", | ||
| "/neighbor.txt", | ||
| ]; | ||
| foreach ( $targets as $target ) { | ||
| $fp = php_cli_server_connect(); | ||
| $req = <<<END | ||
| GET $target HTTP/1.1 | ||
|
|
||
|
|
||
|
|
||
| END; | ||
|
|
||
| echo "$target:\n"; | ||
| if (fwrite($fp, $req)) { | ||
| while (!feof($fp)) { | ||
| echo fgets($fp); | ||
| } | ||
| } | ||
| echo "\n\n----------\n"; | ||
| fclose($fp); | ||
| } | ||
|
|
||
| unlink($docRoot . '/public.txt'); | ||
| unlink($docRoot . '/leak.txt'); | ||
| // On Windows, to delete a symlink to a directory, rmdir() has to be used instead. | ||
| if (PHP_OS_FAMILY === 'Windows') { | ||
| rmdir($docRoot . '/escape'); | ||
| } else { | ||
| unlink($docRoot . '/escape'); | ||
| } | ||
| unlink($docRoot . '/neighbor.txt'); | ||
| unlink($docRoot . '-neighbor.txt'); | ||
|
|
||
| ?> | ||
| --EXPECTF-- | ||
| bool(true) | ||
| bool(true) | ||
| bool(true) | ||
| /public.txt: | ||
| HTTP/1.1 200 OK | ||
| Date: %s | ||
| Connection: close | ||
| Content-Type: text/plain; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| Public file contents | ||
|
|
||
| ---------- | ||
| /../traversal.txt: | ||
| HTTP/1.1 404 Not Found | ||
| Date: %s | ||
| Connection: close | ||
| X-Powered-By: %s | ||
| Content-Type: text/html; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| <!doctype html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><title>404 Not Found</title><style> | ||
| body { background-color: #fcfcfc; color: #333333; margin: 0; padding:0; } | ||
| h1 { font-size: 1.5em; font-weight: normal; background-color: #9999cc; min-height:2em; line-height:2em; border-bottom: 1px inset black; margin: 0; } | ||
| h1, p { padding-left: 10px; } | ||
| code.url { background-color: #eeeeee; font-family:monospace; padding:0 2px;} | ||
| </style> | ||
| </head><body><h1>Not Found</h1><p>The requested resource <code class="url">/../traversal.txt</code> was not found on this server.</p></body></html> | ||
|
|
||
| ---------- | ||
| /leak.txt: | ||
| HTTP/1.1 404 Not Found | ||
| Date: %s | ||
| Connection: close | ||
| X-Powered-By: %s | ||
| Content-Type: text/html; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| <!doctype html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><title>404 Not Found</title><style> | ||
| body { background-color: #fcfcfc; color: #333333; margin: 0; padding:0; } | ||
| h1 { font-size: 1.5em; font-weight: normal; background-color: #9999cc; min-height:2em; line-height:2em; border-bottom: 1px inset black; margin: 0; } | ||
| h1, p { padding-left: 10px; } | ||
| code.url { background-color: #eeeeee; font-family:monospace; padding:0 2px;} | ||
| </style> | ||
| </head><body><h1>Not Found</h1><p>The requested resource <code class="url">/leak.txt</code> was not found on this server.</p></body></html> | ||
|
|
||
| ---------- | ||
| /escape/secret-config.txt: | ||
| HTTP/1.1 404 Not Found | ||
| Date: %s | ||
| Connection: close | ||
| X-Powered-By: %s | ||
| Content-Type: text/html; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| <!doctype html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><title>404 Not Found</title><style> | ||
| body { background-color: #fcfcfc; color: #333333; margin: 0; padding:0; } | ||
| h1 { font-size: 1.5em; font-weight: normal; background-color: #9999cc; min-height:2em; line-height:2em; border-bottom: 1px inset black; margin: 0; } | ||
| h1, p { padding-left: 10px; } | ||
| code.url { background-color: #eeeeee; font-family:monospace; padding:0 2px;} | ||
| </style> | ||
| </head><body><h1>Not Found</h1><p>The requested resource <code class="url">/escape/secret-config.txt</code> was not found on this server.</p></body></html> | ||
|
|
||
| ---------- | ||
| /neighbor.txt: | ||
| HTTP/1.1 404 Not Found | ||
| Date: %s | ||
| Connection: close | ||
| X-Powered-By: %s | ||
| Content-Type: text/html; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| <!doctype html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><title>404 Not Found</title><style> | ||
| body { background-color: #fcfcfc; color: #333333; margin: 0; padding:0; } | ||
| h1 { font-size: 1.5em; font-weight: normal; background-color: #9999cc; min-height:2em; line-height:2em; border-bottom: 1px inset black; margin: 0; } | ||
| h1, p { padding-left: 10px; } | ||
| code.url { background-color: #eeeeee; font-family:monospace; padding:0 2px;} | ||
| </style> | ||
| </head><body><h1>Not Found</h1><p>The requested resource <code class="url">/neighbor.txt</code> was not found on this server.</p></body></html> | ||
|
|
||
| ---------- |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| --TEST-- | ||
| Built-in web server with root as the docroot | ||
| --SKIPIF-- | ||
| <?php | ||
| include "skipif.inc"; | ||
| ?> | ||
| --FILE-- | ||
| <?php | ||
| include "php_cli_server.inc"; | ||
|
|
||
| $server = php_cli_server_start(null, null, [], "/"); | ||
| assert($server->docRoot === '/'); | ||
|
|
||
| file_put_contents(__DIR__ . '/public.txt', 'Public file contents'); | ||
|
|
||
| $tmpFile = tempnam(sys_get_temp_dir(), "php_cli_server_025"); | ||
| @unlink($tmpFile); | ||
| mkdir($tmpFile); | ||
| file_put_contents($tmpFile . '/secret-config.txt', 'Secret credentials, NOT PUBLIC'); | ||
|
|
||
| symlink($tmpFile, __DIR__ . '/escape'); | ||
| symlink($tmpFile . '/secret-config.txt', __DIR__ . '/leak.txt'); | ||
|
|
||
| $targets = [ | ||
| __DIR__ . "/public.txt", | ||
| __DIR__ . "/../traversal.txt", | ||
| __DIR__ . "/leak.txt", | ||
| __DIR__ . "/escape/secret-config.txt", | ||
| ]; | ||
| foreach ( $targets as $target ) { | ||
| $fp = php_cli_server_connect(); | ||
| $req = <<<END | ||
| GET $target HTTP/1.1 | ||
|
|
||
|
|
||
|
|
||
| END; | ||
|
|
||
| echo "$target:\n"; | ||
| if (fwrite($fp, $req)) { | ||
| $had_response = false; | ||
| while (!feof($fp)) { | ||
| $had_response = true; | ||
| echo fgets($fp); | ||
| } | ||
| if (!$had_response) { | ||
| echo "No response from server?\n"; | ||
| } | ||
| } else { | ||
| echo "fwrite() failed?\n"; | ||
| } | ||
| echo "\n\n----------\n"; | ||
| fclose($fp); | ||
| } | ||
|
|
||
| unlink(__DIR__ . '/public.txt'); | ||
| unlink(__DIR__ . '/leak.txt'); | ||
| // On Windows, to delete a symlink to a directory, rmdir() has to be used instead. | ||
| if (PHP_OS_FAMILY === 'Windows') { | ||
| rmdir(__DIR__ . '/escape'); | ||
| } else { | ||
| unlink(__DIR__ . '/escape'); | ||
| } | ||
|
|
||
| ?> | ||
| --EXPECTF-- | ||
| %s/public.txt: | ||
| HTTP/1.1 200 OK | ||
| Date: %s | ||
| Connection: close | ||
| Content-Type: text/plain; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| Public file contents | ||
|
|
||
| ---------- | ||
| %s/../traversal.txt: | ||
| HTTP/1.1 404 Not Found | ||
| Date: %s | ||
| Connection: close | ||
| X-Powered-By: %s | ||
| Content-Type: text/html; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| <!doctype html><html><head><meta name="viewport" content="width=device-width, initial-scale=1"><title>404 Not Found</title><style> | ||
| body { background-color: #fcfcfc; color: #333333; margin: 0; padding:0; } | ||
| h1 { font-size: 1.5em; font-weight: normal; background-color: #9999cc; min-height:2em; line-height:2em; border-bottom: 1px inset black; margin: 0; } | ||
| h1, p { padding-left: 10px; } | ||
| code.url { background-color: #eeeeee; font-family:monospace; padding:0 2px;} | ||
| </style> | ||
| </head><body><h1>Not Found</h1><p>The requested resource <code class="url">%s/../traversal.txt</code> was not found on this server.</p></body></html> | ||
|
|
||
| ---------- | ||
| %s/leak.txt: | ||
| HTTP/1.1 200 OK | ||
| Date: %s | ||
| Connection: close | ||
| Content-Type: text/plain; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| Secret credentials, NOT PUBLIC | ||
|
|
||
| ---------- | ||
| %s/escape/secret-config.txt: | ||
| HTTP/1.1 200 OK | ||
| Date: %s | ||
| Connection: close | ||
| Content-Type: text/plain; charset=UTF-8 | ||
| Content-Length: %d | ||
|
|
||
| Secret credentials, NOT PUBLIC | ||
|
|
||
| ---------- |
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