genhomedircon: drop backwards compatibility section
Signed-off-by: Christian Göttsche <cgzones@googlemail.com>
This commit is contained in:
Christian Göttsche
parent
072c0a9458
commit
577373f0db
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@ -40,7 +40,7 @@
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# are always "real" (including root, in the default configuration).
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#
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import sys, os, pwd, getopt, re
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import sys, pwd, getopt, re
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from subprocess import getstatusoutput
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EXCLUDE_LOGINS=["/sbin/nologin", "/bin/false"]
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@ -69,162 +69,6 @@ def getStartingUID():
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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 compatibility
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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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u[5].count("/") > 1:
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prefix = u[5][:u[5].rfind("/")]
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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 = 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=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("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=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=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].*$", "", homedir)
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if not homedir in prefixes:
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prefixes[homedir] = ""
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#the idea is that we need to find all of the home_root_t directories we do this by just accepting
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#any default home directory defined by either /etc/libuser.conf or /etc/default/useradd
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#we then get the potential home directory roots from /etc/passwd or nis or wherever and look at
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#the defined homedir for all users with UID > STARTING_UID. This list of possible root homedirs
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#is then checked to see if it has an explicit context defined in the file_contexts. Explicit
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#is any regex that would match it which does not end with .*$ 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=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(r"\(/\*\)\?$", "", regex)
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#match a trailing .+
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regex = re.sub(r"\.+$", "", regex)
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#match a trailing .*
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regex = re.sub(r"\.\*$", "", regex)
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#strip a (/.*)? which matches anything trailing to a /*$ which matches trailing /'s
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regex = re.sub(r"\(\/\.\*\)\?", "", 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|" % (prefixes.keys() + "|; p; g; s|^HOME_ROOT|")
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sed_dir = "h; s|^HOME_DIR|%s/[^/]+|; s|ROLE_|user_|" % (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=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("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 compatibility 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=getstatusoutput("grep -h '^HOME' /etc/default/useradd")
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@ -466,10 +310,6 @@ try:
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if setype is None:
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setype=getSELinuxType(directory)
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if len(cmds) == 2:
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oldgenhomedircon(cmds[0], cmds[1])
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sys.exit(0)
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if len(cmds) != 0:
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usage()
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selconf=selinuxConfig(directory, setype, usepwd)
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