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