Description of problem:

When using chroot_local_user=YES and text_userdb_names=YES, name resolution is not guaranteed. The manpage should be updated accordingly.

Indeed, because the user session is chrooted, the calls to getpwuid()/getgrgid() fail to open /etc/passwd, /etc/groups or call NSCD socket when applicable.
When no nscd is running, then textual names are never displayed.
When nscd is running, then it depends on the following scenarios:

1. cache updated before ftp session is opened
-> name resolution in ftp session with current cache content

2. cache invalidated before ftp session is opened
-> no name resolution in ftp session

3. cache invalidated after ftp session is opened
-> name resolution in ftp session with old cache content

4. cache updated after ftp session is opened
-> name resolution in ftp session with old cache content


Version-Release number of selected component (if applicable):

7.3

How reproducible:

Always

Steps to Reproduce:
1. configure vsftpd with text_userdb_names=YES and chroot_local_user=YES
2. open ftp session
3. perform "ls -l" from ftp session

Actual results:

uid/gid are printed

Expected results:

user/group (names) should be printed

Additional info:

Proposal for new vsftpd.conf:

       text_userdb_names
              By  default,  numeric  IDs  are shown in the user and group fields of directory listings. You can get
              textual names by enabling this parameter. It is off by default for performance reasons.
              Note that textual names are not guaranteed when chroot_local_user is set to YES.

              Default: NO