DNSMASQ runs as user nobody per design of dnsmasq devs.
from the manpage:
-u, --user=<username>
Specify the userid to which dnsmasq will change after startup. Dnsmasq must
normally be started as root, but it will drop root privileges after startup by
changing id to another user. Normally this user is "nobody" but that can be
over-ridden with this switch.
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https://bugs.launchpad.net/bugs/1105493
Title:
network manager runs dnsmasq as user nobody
Status in network-manager package in Ubuntu:
Confirmed
Bug description:
Network Manager starts dnsmasq to provide better performing DNS
service to the end user; however, it starts dnsmasq as user nobody:
$ ps auwwx | grep [d]nsmasq
nobody 993 0.0 0.1 33072 1120 ? S 12:06 0:00
/usr/sbin/dnsmasq --no-resolv --keep-in-foreground --no-hosts --bind-interfaces
--pid-file=/var/run/sendsigs.omit.d/network-manager.dnsmasq.pid
--listen-address=127.0.1.1 --conf-file=/var/run/nm-dns-dnsmasq.conf
--cache-size=0 --proxy-dnssec
--enable-dbus=org.freedesktop.NetworkManager.dnsmasq
--conf-dir=/etc/NetworkManager/dnsmasq.d
Generally it's bad form from a security perspective to run daemons as
user nobody because a vulnerability in one daemon will possibly allow
it, when compromised, to interfere with another daemon that is also
running as nobody. The preferred solution is to run it under a
service-specific system user.
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: network-manager 0.9.6.0-0ubuntu7
ProcVersionSignature: Ubuntu 3.5.0-22.34-generic 3.5.7.2
Uname: Linux 3.5.0-22-generic x86_64
ApportVersion: 2.6.1-0ubuntu10
Architecture: amd64
CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211
not found.
Date: Fri Jan 25 14:17:36 2013
IfupdownConfig:
# interfaces(5) file used by ifup(8) and ifdown(8)
auto lo
iface lo inet loopback
InstallationDate: Installed on 2013-01-25 (0 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
IpRoute:
default via 10.0.2.2 dev eth0 proto static
10.0.2.0/24 dev eth0 proto kernel scope link src 10.0.2.15 metric 1
169.254.0.0/16 dev eth0 scope link metric 1000
IwConfig:
eth0 no wireless extensions.
lo no wireless extensions.
MarkForUpload: True
NetworkManager.state:
[main]
NetworkingEnabled=true
WirelessEnabled=true
WWANEnabled=true
WimaxEnabled=true
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
RfKill:
SourcePackage: network-manager
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con:
NAME UUID TYPE
TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY
DBUS-PATH
Wired connection 1 6065df63-d4a5-4426-bf03-4b938adcdf28
802-3-ethernet 1359152173 Fri 25 Jan 2013 02:16:13 PM PST yes
no /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
DEVICE TYPE STATE DBUS-PATH
eth0 802-3-ethernet connected
/org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE
WIFI WWAN-HARDWARE WWAN
running 0.9.6.0 connected enabled enabled
enabled enabled disabled
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