diff options
| author | Florian Weimer <fweimer@redhat.com> | 2015-10-02 11:34:13 +0200 |
|---|---|---|
| committer | Florian Weimer <fweimer@redhat.com> | 2015-10-02 11:34:13 +0200 |
| commit | 676599b36a92f3c201c5682ee7a5caddd9f370a4 (patch) | |
| tree | 6860752c26ccab76ee9db5e60ff465d1edf25feb /include/nss.h | |
| parent | b0f81637d5bda47be93bac34b68f429a12979321 (diff) | |
Harden putpwent, putgrent, putspent, putspent against injection [BZ #18724]
This prevents injection of ':' and '\n' into output functions which
use the NSS files database syntax. Critical fields (user/group names
and file system paths) are checked strictly. For backwards
compatibility, the GECOS field is rewritten instead.
The getent program is adjusted to use the put*ent functions in libc,
instead of local copies. This changes the behavior of getent if user
names start with '-' or '+'.
Diffstat (limited to 'include/nss.h')
| -rw-r--r-- | include/nss.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/nss.h b/include/nss.h index 0541335c18..1e8cc3910d 100644 --- a/include/nss.h +++ b/include/nss.h @@ -1 +1,14 @@ +#ifndef _NSS_H #include <nss/nss.h> + +#define NSS_INVALID_FIELD_CHARACTERS ":\n" +extern const char __nss_invalid_field_characters[] attribute_hidden; + +_Bool __nss_valid_field (const char *value) + attribute_hidden internal_function; +_Bool __nss_valid_list_field (char **list) + attribute_hidden internal_function; +const char *__nss_rewrite_field (const char *value, char **to_be_freed) + attribute_hidden internal_function; + +#endif /* _NSS_H */ |