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Disable symlinks: don't allow creating or truncating a file via a symlink in

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the last path component if "if_not_owner" parameter is used.

To prevent race condition we have to open a file before checking its owner and
there's no way to change access flags for already opened file descriptor, so
we disable symlinks for the last path component at all if flags allow creating
or truncating the file.
This commit is contained in:
Valentin Bartenev 2012-02-21 15:04:41 +00:00
parent 4b7c1acd1a
commit 2bc52b081d
1 changed files with 3 additions and 1 deletions
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4
src/core/ngx_open_file_cache.c
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@ -678,7 +678,9 @@ ngx_open_file_wrapper(ngx_str_t *name, ngx_open_file_info_t *of,
goto failed;
}
if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER) {
if (of->disable_symlinks == NGX_DISABLE_SYMLINKS_NOTOWNER
&& !(create & (NGX_FILE_CREATE_OR_OPEN|NGX_FILE_TRUNCATE)))
{
fd = ngx_openat_file_owner(at_fd, p, mode, create, access, log);
} else {