482 lines
17 KiB
Plaintext
482 lines
17 KiB
Plaintext
|
#! /usr/bin/env python
|
||
|
# Copyright (C) 2004 Tresys Technology, LLC
|
||
|
# see file 'COPYING' for use and warranty information
|
||
|
#
|
||
|
# genhomedircon - this script is used to generate file context
|
||
|
# configuration entries for user home directories based on their
|
||
|
# default roles and is run when building the policy. Specifically, we
|
||
|
# replace HOME_ROOT, HOME_DIR, and ROLE macros in .fc files with
|
||
|
# generic and user-specific values.
|
||
|
#
|
||
|
# Based off original script by Dan Walsh, <dwalsh@redhat.com>
|
||
|
#
|
||
|
# ASSUMPTIONS:
|
||
|
#
|
||
|
# The file CONTEXTDIR/files/homedir_template exists. This file is used to
|
||
|
# set up the home directory context for each real user.
|
||
|
#
|
||
|
# If a user has more than one role in CONTEXTDIR/local.users, genhomedircon uses
|
||
|
# the first role in the list.
|
||
|
#
|
||
|
# If a user is not listed in CONTEXTDIR/local.users, he will default to user_u, role user
|
||
|
#
|
||
|
# "Real" users (as opposed to system users) are those whose UID is greater than
|
||
|
# or equal STARTING_UID (usually 500) and whose login is not a member of
|
||
|
# EXCLUDE_LOGINS. Users who are explicitly defined in CONTEXTDIR/local.users
|
||
|
# are always "real" (including root, in the default configuration).
|
||
|
#
|
||
|
#
|
||
|
# Old ASSUMPTIONS:
|
||
|
#
|
||
|
# If a user has more than one role in FILECONTEXTDIR/users, genhomedircon uses
|
||
|
# the first role in the list.
|
||
|
#
|
||
|
# If a user is not listed in FILECONTEXTDIR/users, genhomedircon assumes that
|
||
|
# the user's home dir will be found in one of the HOME_ROOTs.
|
||
|
#
|
||
|
# "Real" users (as opposed to system users) are those whose UID is greater than
|
||
|
# or equal STARTING_UID (usually 500) and whose login is not a member of
|
||
|
# EXCLUDE_LOGINS. Users who are explicitly defined in FILECONTEXTDIR/users
|
||
|
# are always "real" (including root, in the default configuration).
|
||
|
#
|
||
|
|
||
|
import commands, sys, os, pwd, string, getopt, re
|
||
|
|
||
|
EXCLUDE_LOGINS=["/sbin/nologin", "/bin/false"]
|
||
|
|
||
|
def getStartingUID():
|
||
|
starting_uid = sys.maxint
|
||
|
rc=commands.getstatusoutput("grep -h '^UID_MIN' /etc/login.defs")
|
||
|
if rc[0] == 0:
|
||
|
uid_min = re.sub("^UID_MIN[^0-9]*", "", rc[1])
|
||
|
#stip any comment from the end of the line
|
||
|
uid_min = uid_min.split("#")[0]
|
||
|
uid_min = uid_min.strip()
|
||
|
if int(uid_min) < starting_uid:
|
||
|
starting_uid = int(uid_min)
|
||
|
rc=commands.getstatusoutput("grep -h '^LU_UIDNUMBER' /etc/libuser.conf")
|
||
|
if rc[0] == 0:
|
||
|
lu_uidnumber = re.sub("^LU_UIDNUMBER[^0-9]*", "", rc[1])
|
||
|
#stip any comment from the end of the line
|
||
|
lu_uidnumber = re.sub("[ \t].*", "", lu_uidnumber)
|
||
|
lu_uidnumber = lu_uidnumber.split("#")[0]
|
||
|
lu_uidnumber = lu_uidnumber.strip()
|
||
|
if int(lu_uidnumber) < starting_uid:
|
||
|
starting_uid = int(lu_uidnumber)
|
||
|
if starting_uid == sys.maxint:
|
||
|
starting_uid = 500
|
||
|
return starting_uid
|
||
|
|
||
|
#############################################################################
|
||
|
#
|
||
|
# This section is just for backwards compatability
|
||
|
#
|
||
|
#############################################################################
|
||
|
def getPrefixes():
|
||
|
ulist = pwd.getpwall()
|
||
|
STARTING_UID=getStartingUID()
|
||
|
prefixes = {}
|
||
|
for u in ulist:
|
||
|
if u[2] >= STARTING_UID and \
|
||
|
not u[6] in EXCLUDE_LOGINS and \
|
||
|
u[5] != "/" and \
|
||
|
string.count(u[5], "/") > 1:
|
||
|
prefix = u[5][:string.rfind(u[5], "/")]
|
||
|
if not prefixes.has_key(prefix):
|
||
|
prefixes[prefix] = ""
|
||
|
return prefixes
|
||
|
|
||
|
def getUsers(filecontextdir):
|
||
|
rc = commands.getstatusoutput("grep ^user %s/users" % filecontextdir)
|
||
|
udict = {}
|
||
|
if rc[0] == 0:
|
||
|
ulist = rc[1].strip().split("\n")
|
||
|
for u in ulist:
|
||
|
user = u.split()
|
||
|
try:
|
||
|
if user[1] == "user_u" or user[1] == "system_u":
|
||
|
continue
|
||
|
# !!! chooses first role in the list to use in the file context !!!
|
||
|
role = user[3]
|
||
|
if role == "{":
|
||
|
role = user[4]
|
||
|
role = role.split("_r")[0]
|
||
|
home = pwd.getpwnam(user[1])[5]
|
||
|
if home == "/":
|
||
|
continue
|
||
|
prefs = {}
|
||
|
prefs["role"] = role
|
||
|
prefs["home"] = home
|
||
|
udict[user[1]] = prefs
|
||
|
except KeyError:
|
||
|
sys.stderr.write("The user \"%s\" is not present in the passwd file, skipping...\n" % user[1])
|
||
|
return udict
|
||
|
|
||
|
def update(filecontext, user, prefs):
|
||
|
rc=commands.getstatusoutput("grep -h '^HOME_DIR' %s | grep -v vmware | sed -e 's|HOME_DIR|%s|' -e 's/ROLE/%s/' -e 's/system_u/%s/'" % (filecontext, prefs["home"], prefs["role"], user))
|
||
|
if rc[0] == 0:
|
||
|
print rc[1]
|
||
|
else:
|
||
|
errorExit(string.join("grep/sed error ", rc[1]))
|
||
|
return rc
|
||
|
|
||
|
def oldgenhomedircon(filecontextdir, filecontext):
|
||
|
sys.stderr.flush()
|
||
|
|
||
|
if os.path.isdir(filecontextdir) == 0:
|
||
|
sys.stderr.write("New usage is the following\n")
|
||
|
usage()
|
||
|
#We are going to define home directory used by libuser and show-utils as a home directory root
|
||
|
prefixes = {}
|
||
|
rc=commands.getstatusoutput("grep -h '^HOME' /etc/default/useradd")
|
||
|
if rc[0] == 0:
|
||
|
homedir = rc[1].split("=")[1]
|
||
|
homedir = homedir.split("#")[0]
|
||
|
homedir = homedir.strip()
|
||
|
if not prefixes.has_key(homedir):
|
||
|
prefixes[homedir] = ""
|
||
|
else:
|
||
|
#rc[0] == 256 means the file was there, we read it, but the grep didn't match
|
||
|
if rc[0] != 256:
|
||
|
sys.stderr.write("%s\n" % rc[1])
|
||
|
sys.stderr.write("You do not have access to /etc/default/useradd HOME=\n")
|
||
|
sys.stderr.flush()
|
||
|
|
||
|
|
||
|
rc=commands.getstatusoutput("grep -h '^LU_HOMEDIRECTORY' /etc/libuser.conf")
|
||
|
if rc[0] == 0:
|
||
|
homedir = rc[1].split("=")[1]
|
||
|
homedir = homedir.split("#")[0]
|
||
|
homedir = homedir.strip()
|
||
|
homedir = re.sub(r"[^/a-zA-Z0-9].*$", "", homedir)
|
||
|
if not prefixes.has_key(homedir):
|
||
|
prefixes[homedir] = ""
|
||
|
|
||
|
#the idea is that we need to find all of the home_root_t directories we do this by just accepting
|
||
|
#any default home directory defined by either /etc/libuser.conf or /etc/default/useradd
|
||
|
#we then get the potential home directory roots from /etc/passwd or nis or whereever and look at
|
||
|
#the defined homedir for all users with UID > STARTING_UID. This list of possible root homedirs
|
||
|
#is then checked to see if it has an explicite context defined in the file_contexts. Explicit
|
||
|
#is any regex that would match it which does not end with .*$ or .+$ since those are general
|
||
|
#recursive matches. We then take any regex which ends with [pattern](/.*)?$ and just check against
|
||
|
#[pattern]
|
||
|
potential_prefixes = getPrefixes()
|
||
|
prefix_regex = {}
|
||
|
#this works by grepping the file_contexts for
|
||
|
# 1. ^/ makes sure this is not a comment
|
||
|
# 2. prints only the regex in the first column first cut on \t then on space
|
||
|
rc=commands.getstatusoutput("grep \"^/\" %s | cut -f 1 | cut -f 1 -d \" \" " % (sys.argv[2]) )
|
||
|
if rc[0] == 0:
|
||
|
prefix_regex = rc[1].split("\n")
|
||
|
else:
|
||
|
sys.stderr.write("%s\n" % rc[1])
|
||
|
sys.stderr.write("You do not have access to grep/cut/the file contexts\n")
|
||
|
sys.stderr.flush()
|
||
|
for potential in potential_prefixes.keys():
|
||
|
addme = 1
|
||
|
for regex in prefix_regex:
|
||
|
#match a trailing (/*)? which is actually a bug in rpc_pipefs
|
||
|
regex = re.sub("\(/\*\)\?$", "", regex)
|
||
|
#match a trailing .+
|
||
|
regex = re.sub("\.+$", "", regex)
|
||
|
#match a trailing .*
|
||
|
regex = re.sub("\.\*$", "", regex)
|
||
|
#strip a (/.*)? which matches anything trailing to a /*$ which matches trailing /'s
|
||
|
regex = re.sub("\(\/\.\*\)\?", "", regex)
|
||
|
regex = regex + "/*$"
|
||
|
if re.search(regex, potential, 0):
|
||
|
addme = 0
|
||
|
if addme == 1:
|
||
|
if not prefixes.has_key(potential):
|
||
|
prefixes[potential] = ""
|
||
|
|
||
|
|
||
|
if prefixes.__eq__({}):
|
||
|
sys.stderr.write("LU_HOMEDIRECTORY not set in /etc/libuser.conf\n")
|
||
|
sys.stderr.write("HOME= not set in /etc/default/useradd\n")
|
||
|
sys.stderr.write("And no users with a reasonable homedir found in passwd/nis/ldap/etc...\n")
|
||
|
sys.stderr.write("Assuming /home is the root of home directories\n")
|
||
|
sys.stderr.flush()
|
||
|
prefixes["/home"] = ""
|
||
|
|
||
|
# There may be a more elegant sed script to expand a macro to multiple lines, but this works
|
||
|
sed_root = "h; s|^HOME_ROOT|%s|" % (string.join(prefixes.keys(), "|; p; g; s|^HOME_ROOT|"),)
|
||
|
sed_dir = "h; s|^HOME_DIR|%s/[^/]+|; s|ROLE_|user_|" % (string.join(prefixes.keys(), "/[^/]+|; s|ROLE_|user_|; p; g; s|^HOME_DIR|"),)
|
||
|
|
||
|
# Fill in HOME_ROOT, HOME_DIR, and ROLE for users not explicitly defined in /etc/security/selinux/src/policy/users
|
||
|
rc=commands.getstatusoutput("sed -e \"/^HOME_ROOT/{%s}\" -e \"/^HOME_DIR/{%s}\" %s" % (sed_root, sed_dir, filecontext))
|
||
|
if rc[0] == 0:
|
||
|
print rc[1]
|
||
|
else:
|
||
|
errorExit(string.join("sed error ", rc[1]))
|
||
|
|
||
|
users = getUsers(filecontextdir)
|
||
|
print "\n#\n# User-specific file contexts\n#\n"
|
||
|
|
||
|
# Fill in HOME and ROLE for users that are defined
|
||
|
for u in users.keys():
|
||
|
update(filecontext, u, users[u])
|
||
|
|
||
|
#############################################################################
|
||
|
#
|
||
|
# End of backwards compatability section
|
||
|
#
|
||
|
#############################################################################
|
||
|
|
||
|
def getDefaultHomeDir():
|
||
|
ret = []
|
||
|
rc=commands.getstatusoutput("grep -h '^HOME' /etc/default/useradd")
|
||
|
if rc[0] == 0:
|
||
|
homedir = rc[1].split("=")[1]
|
||
|
homedir = homedir.split("#")[0]
|
||
|
homedir = homedir.strip()
|
||
|
if not homedir in ret:
|
||
|
ret.append(homedir)
|
||
|
else:
|
||
|
#rc[0] == 256 means the file was there, we read it, but the grep didn't match
|
||
|
if rc[0] != 256:
|
||
|
sys.stderr.write("%s\n" % rc[1])
|
||
|
sys.stderr.write("You do not have access to /etc/default/useradd HOME=\n")
|
||
|
sys.stderr.flush()
|
||
|
rc=commands.getstatusoutput("grep -h '^LU_HOMEDIRECTORY' /etc/libuser.conf")
|
||
|
if rc[0] == 0:
|
||
|
homedir = rc[1].split("=")[1]
|
||
|
homedir = homedir.split("#")[0]
|
||
|
homedir = homedir.strip()
|
||
|
if not homedir in ret:
|
||
|
ret.append(homedir)
|
||
|
else:
|
||
|
#rc[0] == 256 means the file was there, we read it, but the grep didn't match
|
||
|
if rc[0] != 256:
|
||
|
sys.stderr.write("%s\n" % rc[1])
|
||
|
sys.stderr.write("You do not have access to /etc/libuser.conf LU_HOMEDIRECTORY=\n")
|
||
|
sys.stderr.flush()
|
||
|
if ret == []:
|
||
|
ret.append("/home")
|
||
|
return ret
|
||
|
|
||
|
def getSELinuxType(directory):
|
||
|
rc=commands.getstatusoutput("grep ^SELINUXTYPE= %s/config" % directory)
|
||
|
if rc[0]==0:
|
||
|
return rc[1].split("=")[-1].strip()
|
||
|
return "targeted"
|
||
|
|
||
|
def usage(error = ""):
|
||
|
if error != "":
|
||
|
sys.stderr.write("%s\n" % error)
|
||
|
sys.stderr.write("Usage: %s [ -d selinuxdir ] [-n | --nopasswd] [-t selinuxtype ]\n" % sys.argv[0])
|
||
|
sys.stderr.flush()
|
||
|
sys.exit(1)
|
||
|
|
||
|
def warning(warning = ""):
|
||
|
sys.stderr.write("%s\n" % warning)
|
||
|
sys.stderr.flush()
|
||
|
|
||
|
def errorExit(error):
|
||
|
sys.stderr.write("%s exiting for: " % sys.argv[0])
|
||
|
sys.stderr.write("%s\n" % error)
|
||
|
sys.stderr.flush()
|
||
|
sys.exit(1)
|
||
|
|
||
|
class selinuxConfig:
|
||
|
def __init__(self, selinuxdir="/etc/selinux", type="targeted", usepwd=1):
|
||
|
self.type=type
|
||
|
self.selinuxdir=selinuxdir +"/"
|
||
|
self.contextdir="/contexts"
|
||
|
self.filecontextdir=self.contextdir+"/files"
|
||
|
self.usepwd=usepwd
|
||
|
|
||
|
def getFileContextDir(self):
|
||
|
return self.selinuxdir+self.type+self.filecontextdir
|
||
|
|
||
|
def getFileContextFile(self):
|
||
|
return self.getFileContextDir()+"/file_contexts"
|
||
|
|
||
|
def getContextDir(self):
|
||
|
return self.selinuxdir+self.type+self.contextdir
|
||
|
|
||
|
def getHomeDirTemplate(self):
|
||
|
return self.getFileContextDir()+"/homedir_template"
|
||
|
|
||
|
def getHomeRootContext(self, homedir):
|
||
|
rc=commands.getstatusoutput("grep HOME_ROOT %s | sed -e \"s|^HOME_ROOT|%s|\"" % ( self.getHomeDirTemplate(), homedir))
|
||
|
if rc[0] == 0:
|
||
|
return rc[1]+"\n"
|
||
|
else:
|
||
|
errorExit(string.join("sed error ", rc[1]))
|
||
|
|
||
|
def getUsersFile(self):
|
||
|
return self.selinuxdir+self.type+"/users/local.users"
|
||
|
|
||
|
def getSystemUsersFile(self):
|
||
|
return self.selinuxdir+self.type+"/users/system.users"
|
||
|
|
||
|
def heading(self):
|
||
|
ret = "\n#\n#\n# User-specific file contexts, generated via %s\n" % sys.argv[0]
|
||
|
ret += "# edit %s to change file_context\n#\n#\n" % self.getUsersFile()
|
||
|
return ret
|
||
|
|
||
|
def getUsers(self):
|
||
|
users=""
|
||
|
rc = commands.getstatusoutput('grep "^user" %s' % self.getSystemUsersFile())
|
||
|
if rc[0] == 0:
|
||
|
users+=rc[1]+"\n"
|
||
|
rc = commands.getstatusoutput("grep ^user %s" % self.getUsersFile())
|
||
|
if rc[0] == 0:
|
||
|
users+=rc[1]
|
||
|
udict = {}
|
||
|
prefs = {}
|
||
|
if users != "":
|
||
|
ulist = users.split("\n")
|
||
|
for u in ulist:
|
||
|
user = u.split()
|
||
|
try:
|
||
|
if len(user)==0 or user[1] == "user_u" or user[1] == "system_u":
|
||
|
continue
|
||
|
# !!! chooses first role in the list to use in the file context !!!
|
||
|
role = user[3]
|
||
|
if role == "{":
|
||
|
role = user[4]
|
||
|
role = role.split("_r")[0]
|
||
|
home = pwd.getpwnam(user[1])[5]
|
||
|
if home == "/":
|
||
|
continue
|
||
|
prefs = {}
|
||
|
prefs["role"] = role
|
||
|
prefs["home"] = home
|
||
|
udict[user[1]] = prefs
|
||
|
except KeyError:
|
||
|
sys.stderr.write("The user \"%s\" is not present in the passwd file, skipping...\n" % user[1])
|
||
|
return udict
|
||
|
|
||
|
def getHomeDirContext(self, user, home, role):
|
||
|
ret="\n\n#\n# Context for user %s\n#\n\n" % user
|
||
|
rc=commands.getstatusoutput("grep '^HOME_DIR' %s | sed -e 's|HOME_DIR|%s|' -e 's/ROLE/%s/' -e 's/system_u/%s/'" % (self.getHomeDirTemplate(), home, role, user))
|
||
|
return ret + rc[1] + "\n"
|
||
|
|
||
|
def genHomeDirContext(self):
|
||
|
users = self.getUsers()
|
||
|
ret=""
|
||
|
# Fill in HOME and ROLE for users that are defined
|
||
|
for u in users.keys():
|
||
|
ret += self.getHomeDirContext (u, users[u]["home"], users[u]["role"])
|
||
|
return ret+"\n"
|
||
|
|
||
|
def checkExists(self, home):
|
||
|
if commands.getstatusoutput("grep -E '^%s[^[:alnum:]_-]' %s" % (home, self.getFileContextFile()))[0] == 0:
|
||
|
return 0
|
||
|
#this works by grepping the file_contexts for
|
||
|
# 1. ^/ makes sure this is not a comment
|
||
|
# 2. prints only the regex in the first column first cut on \t then on space
|
||
|
rc=commands.getstatusoutput("grep \"^/\" %s | cut -f 1 | cut -f 1 -d \" \" " % self.getFileContextFile() )
|
||
|
if rc[0] == 0:
|
||
|
prefix_regex = rc[1].split("\n")
|
||
|
else:
|
||
|
sys.stderr.write("%s\n" % rc[1])
|
||
|
sys.stderr.write("You do not have access to grep/cut/the file contexts\n")
|
||
|
sys.stderr.flush()
|
||
|
exists=1
|
||
|
for regex in prefix_regex:
|
||
|
#match a trailing (/*)? which is actually a bug in rpc_pipefs
|
||
|
regex = re.sub("\(/\*\)\?$", "", regex)
|
||
|
#match a trailing .+
|
||
|
regex = re.sub("\.+$", "", regex)
|
||
|
#match a trailing .*
|
||
|
regex = re.sub("\.\*$", "", regex)
|
||
|
#strip a (/.*)? which matches anything trailing to a /*$ which matches trailing /'s
|
||
|
regex = re.sub("\(\/\.\*\)\?", "", regex)
|
||
|
regex = regex + "/*$"
|
||
|
if re.search(regex, home, 0):
|
||
|
exists = 0
|
||
|
break
|
||
|
if exists == 1:
|
||
|
return 1
|
||
|
else:
|
||
|
return 0
|
||
|
|
||
|
|
||
|
def getHomeDirs(self):
|
||
|
homedirs = []
|
||
|
homedirs = homedirs + getDefaultHomeDir()
|
||
|
starting_uid=getStartingUID()
|
||
|
if self.usepwd==0:
|
||
|
return homedirs
|
||
|
ulist = pwd.getpwall()
|
||
|
for u in ulist:
|
||
|
if u[2] >= starting_uid and \
|
||
|
not u[6] in EXCLUDE_LOGINS and \
|
||
|
u[5] != "/" and \
|
||
|
string.count(u[5], "/") > 1:
|
||
|
homedir = u[5][:string.rfind(u[5], "/")]
|
||
|
if not homedir in homedirs:
|
||
|
if self.checkExists(homedir)==0:
|
||
|
warning("%s is already defined in %s,\n%s will not create a new context." % (homedir, self.getFileContextFile(), sys.argv[0]))
|
||
|
else:
|
||
|
homedirs.append(homedir)
|
||
|
|
||
|
homedirs.sort()
|
||
|
return homedirs
|
||
|
|
||
|
def genoutput(self):
|
||
|
ret= self.heading()
|
||
|
for h in self.getHomeDirs():
|
||
|
ret += self.getHomeDirContext ("user_u" , h+'/[^/]*', "user")
|
||
|
ret += self.getHomeRootContext(h)
|
||
|
ret += self.genHomeDirContext()
|
||
|
return ret
|
||
|
|
||
|
def printout(self):
|
||
|
print self.genoutput()
|
||
|
|
||
|
def write(self):
|
||
|
try:
|
||
|
fd = open(self.getFileContextDir()+"/file_contexts.homedirs", "w")
|
||
|
fd.write(self.genoutput())
|
||
|
fd.close()
|
||
|
except IOError, error:
|
||
|
sys.stderr.write("%s: %s\n" % ( sys.argv[0], error ))
|
||
|
|
||
|
|
||
|
|
||
|
#
|
||
|
# This script will generate home dir file context
|
||
|
# based off the homedir_template file, entries in the password file, and
|
||
|
#
|
||
|
try:
|
||
|
usepwd=1
|
||
|
directory="/etc/selinux"
|
||
|
type=None
|
||
|
gopts, cmds = getopt.getopt(sys.argv[1:], 'nd:t:', ['help',
|
||
|
'type=',
|
||
|
'nopasswd',
|
||
|
'dir='])
|
||
|
for o,a in gopts:
|
||
|
if o == '--type' or o == "-t":
|
||
|
type=a
|
||
|
if o == '--nopasswd' or o == "-n":
|
||
|
usepwd=0
|
||
|
if o == '--dir' or o == "-d":
|
||
|
directory=a
|
||
|
if o == '--help':
|
||
|
usage()
|
||
|
|
||
|
|
||
|
if type==None:
|
||
|
type=getSELinuxType(directory)
|
||
|
|
||
|
if len(cmds) == 2:
|
||
|
oldgenhomedircon(cmds[0], cmds[1])
|
||
|
sys.exit(0)
|
||
|
|
||
|
if len(cmds) != 0:
|
||
|
usage()
|
||
|
selconf=selinuxConfig(directory, type, usepwd)
|
||
|
selconf.write()
|
||
|
|
||
|
except getopt.error, error:
|
||
|
errorExit(string.join("Options Error ", error))
|
||
|
except ValueError, error:
|
||
|
errorExit(string.join("ValueError ", error))
|
||
|
except IndexError, error:
|
||
|
errorExit("IndexError")
|