11-06-2010
Probably hardcoded, again. Without an /etc/passwd, they're not using any normal login system, just using setuid() and setgid() manually. Groups and users will have their usual meanings but no labels, and perhaps not even a way to check which users belong to what groups anymore. (scratch that -- /proc/pid/status may be useful there.)
The group ID may be arbitrary. The user ID 501 may be the first or second non-admin user; the first created on my system was 1000, but I've seen it start at 500 elsewhere.
Another possibility has occurred to me: You may be operating in a chroot, denied access to the /etc/passwd file.
Last edited by Corona688; 11-06-2010 at 01:53 PM..
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_secure_path
_SECURE_PATH(3) BSD Library Functions Manual _SECURE_PATH(3)
NAME
_secure_path -- determine if a file appears to be secure
LIBRARY
System Utilities Library (libutil, -lutil)
SYNOPSIS
#include <sys/types.h>
#include <libutil.h>
int
_secure_path(const char *path, uid_t uid, gid_t gid);
DESCRIPTION
This function does some basic security checking on a given path. It is intended to be used by processes running with root privileges in
order to decide whether or not to trust the contents of a given file. It uses a method often used to detect system compromise.
A file is considered 'secure' if it meets the following conditions:
1. The file exists, and is a regular file (not a symlink, device special or named pipe, etc.),
2. Is not world writable.
3. Is owned by the given uid or uid 0, if uid is not -1,
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RETURN VALUES
This function returns zero if the file exists and may be considered secure, -2 if the file does not exist, and -1 otherwise to indicate a
security failure. The syslog(3) function is used to log any failure of this function, including the reason, at LOG_ERR priority.
SEE ALSO
lstat(2), syslog(3)
HISTORY
Code from which this function was derived was contributed to the FreeBSD project by Berkeley Software Design, Inc.
BUGS
The checks carried out are rudimentary and no attempt is made to eliminate race conditions between use of this function and access to the
file referenced.
BSD
May 2, 1997 BSD