1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
# portage_data.py -- Calculated/Discovered Data Values
# Copyright 1998-2004 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Id$
if not hasattr(__builtins__, "set"):
from sets import Set as set
import os,pwd,grp
from portage_util import writemsg
from output import green,red
from output import create_color_func
bad = create_color_func("BAD")
ostype=os.uname()[0]
lchown = None
if ostype=="Linux" or ostype.lower().endswith("gnu"):
userland="GNU"
os.environ["XARGS"]="xargs -r"
elif ostype == "Darwin":
userland="Darwin"
os.environ["XARGS"]="xargs"
def lchown(*pos_args, **key_args):
pass
elif ostype.endswith("BSD") or ostype =="DragonFly":
userland="BSD"
os.environ["XARGS"]="xargs"
else:
writemsg(red("Operating system")+" \""+ostype+"\" "+red("currently unsupported. Exiting.")+"\n")
sys.exit(1)
if not lchown:
if "lchown" in dir(os):
# Included in python-2.3
lchown = os.lchown
else:
try:
import missingos
lchown = missingos.lchown
except ImportError:
def lchown(*pos_args, **key_args):
writemsg(red("!!!") + " It seems that os.lchown does not" + \
" exist. Please rebuild python.\n", noiselevel=-1)
lchown()
os.environ["USERLAND"]=userland
def portage_group_warning():
warn_prefix = bad("*** WARNING *** ")
mylines = [
"For security reasons, only system administrators should be",
"allowed in the portage group. Untrusted users or processes",
"can potentially exploit the portage group for attacks such as",
"local privilege escalation."
]
for x in mylines:
writemsg(warn_prefix, noiselevel=-1)
writemsg(x, noiselevel=-1)
writemsg("\n", noiselevel=-1)
writemsg("\n", noiselevel=-1)
# Portage has 3 security levels that depend on the uid and gid of the main
# process and are assigned according to the following table:
#
# Privileges secpass uid gid
# normal 0 any any
# group 1 any portage_gid
# super 2 0 any
#
# If the "wheel" group does not exist then wheelgid falls back to 0.
# If the "portage" group does not exist then portage_uid falls back to wheelgid.
secpass=0
uid=os.getuid()
wheelgid=0
if uid==0:
secpass=2
try:
wheelgid=grp.getgrnam("wheel")[2]
except KeyError:
writemsg("portage initialization: your system doesn't have a 'wheel' group.\n")
writemsg("Please fix this as it is a normal system requirement. 'wheel' is GID 10\n")
writemsg("`emerge baselayout` and a config update with dispatch-conf, etc-update\n")
writemsg("or cfg-update should remedy this problem.\n")
pass
#Discover the uid and gid of the portage user/group
try:
portage_uid=pwd.getpwnam("portage")[2]
portage_gid=grp.getgrnam("portage")[2]
if secpass < 1 and portage_gid in os.getgroups():
secpass=1
except KeyError:
portage_uid=0
portage_gid=0
writemsg("\n")
writemsg( red("portage: 'portage' user or group missing. Please update baselayout\n"))
writemsg( red(" and merge portage user(250) and group(250) into your passwd\n"))
writemsg( red(" and group files. Non-root compilation is disabled until then.\n"))
writemsg( " Also note that non-root/wheel users will need to be added to\n")
writemsg( " the portage group to do portage commands.\n")
writemsg("\n")
writemsg( " For the defaults, line 1 goes into passwd, and 2 into group.\n")
writemsg(green(" portage:x:250:250:portage:/var/tmp/portage:/bin/false\n"))
writemsg(green(" portage::250:portage\n"))
writemsg("\n")
portage_group_warning()
userpriv_groups = [portage_gid]
if secpass >= 2:
# Get a list of group IDs for the portage user. Do not use grp.getgrall()
# since it is known to trigger spurious SIGPIPE problems with nss_ldap.
from commands import getstatusoutput
mystatus, myoutput = getstatusoutput("id -G portage")
if mystatus == os.EX_OK:
for x in myoutput.split():
try:
userpriv_groups.append(int(x))
except ValueError:
pass
del x
userpriv_groups = list(set(userpriv_groups))
del getstatusoutput, mystatus, myoutput
|
GitWeb