Difference between revisions of "User talk:Haoqili"

Revision as of 16:50, 3 August 2009

Thanks to Tom, Zhanna, and Will for helping me find the solutions.

Things to do

• read about FAST
• make mkm test cleaner?

Kerberos Little Bugs I've encountered and fixed (started loggin since Jun 24th).

• When trying to kinit username

ERROR: kinit: Cannot contact any KDC for realm [your realm fqdn] while getting initial credentials

SOLUTION: make sure KDC is running. /usr/local/sbin/krb5kdc

SOLUTION: 1. check log file. I looked in /var/log/auth.log. The bottom of it says: Cannot create reply cache file /var/tmp/krb5kdc_rcache: File exits. 2. sudo rm /var/tmp/krb5kdc_rcache.

• Can't start krb5kdc and in auth.log it says:

ERROR: Address already in use - Cannot bind server socket to port [#] address [IP address]

ERROR: <open file '<fdopen>', mode 'rb' at 0x9a38660>

SOLUTION: 1. see if it is true that port [#] is in use by netstat -nap | grep [#] (I also did pgrep -x krb5kdc). 2. kill the process: pkill -x krb5kdc. note the "-x" is for matching exactly the process "krb5kdc".

• When changing password 'kpasswd', Cannot contact any KDC for realm [your realm fqdn]
• and/or Can't start kadmind (know because echo $? = 1). The last chunk of auth.log says:

ERROR:

kadmind[6924]: No dictionary file specified, continuing without one.

kadmind[6924]: setting up network...

kadmind[6924]: Permission denied - Cannot bind server socket to port 464 address 0.0.0.0

kadmind[6924]: setsockopt(6,IPV6_V6ONLY,1) worked

kadmind[6924]: Permission denied - Cannot bind server socket to port 464 address ::

kadmind[6924]: skipping unrecognized local address family 17

kadmind[6924]: skipping unrecognized local address family 17

kadmind[6924]: Permission denied - Cannot bind server socket to port 464 address 192.168.165.145

kadmind[6924]: setsockopt(6,IPV6_V6ONLY,1) worked

kadmind[6924]: Permission denied - Cannot bind TCP server socket on ::.464

kadmind[6924]: Permission denied - Cannot bind RPC server socket on 0.0.0.0.749

kadmind[6924]: set up 0 sockets

kadmind[6924]: no sockets set up?

Reason (provided by tlyu): It is trying to bind to a privileged port. you need to give it a different port number. actually, two different port numbers: one for password changing and one for normal kadmin.

SOLUTION:

In kdc.conf inserted the last two lines here

kdc_ports = 8888

kpasswd_port = 8887

kadmind_port = 8886

In krb5.conf modify/insert the lines:

admin_server = yourComputerName.domain:8886

kpasswd_server = yourComputerName.domain:8887

• Purge key (kdb5_util purge_mkeys) gives an error

ERROR:

kdb5_util: Invalid argument while updating actkvno data for master principal entry

SOLUTION:

#you must activate the keys that have not been "used" like this:

kdb5_util use_mkey kvno [time]

#i.e. kdb5_util use_mkey 2 'now+2days'

• when running a kadmin command. Runs into operation requires xx privilege error

ERROR:

$ kadmin -p haoqili/admin -w test123 -q 'listprincs'

Authenticating as principal haoqili/admin with password.

get_principals: Operation requires ``list'' privilege while retrieving list.

SOLUTION:

I didn't create my acl file yet. In kdc.conf, I have specified acl_file = /home/haoqili/kdcfiles/kadm5.acl and now I need to create the kadm5.acl

#kadm5.acl, setting up my "admin" principal with all rights, i.e. *

haoqili/admin *

Also, before I created the kadm5.acl, I used echo $? to check the command. However, it gave me a 0 even though there were stderr. Tom says: "kadmin is meant to be an interactive program, so exit status might not be as meaningful."

P.S. I later changed the line in my acl file to be */admin * to allow others

Python Bugs I've encountered and fixed

• When talking to the terminal shell, a command (in my case, kdbt_util add_mkey) asks for password twice (second time is confirmation). I first tried:

p = Popen(command.split(), stdin=PIPE, stdout=PIPE, stderr=PIPE)

(out, err) = p.communicate('password')

(out2, err2) = p.communicate('password')

When I ran it, I got a chunk of error that ends with: ValueError: I/O operation on closed file. So what happens is that communicate closes the pipe, it breaks (even if it only runs once).

Solution code:

p = Popen(command.split(), stdin=PIPE, stdout=PIPE, stderr=PIPE)

p.stdin.write('password'+'\n')

p.stdin.write('password'+'\n')

Note don't forget the new line at the end.

Tips. Useful little things to know

Kerberos

• Good link
• kadmin.local -q 'modprinc +needchange [princname]' , the flag needchange forces the principal to change its password upon kinit.
• kadmin.local -q 'modprinc -policy [policyname] [princname]' Sets up a policy for the principal. This "policy" can store previous passwords and ensures that new passwords are not used before.
• There is a bug in the code 6507 kdb5_util update_princ_encryption uses latest mkey instead of mkey
• AES has replaced Triple DES but there are still places taht have Triple DES set as the default (such as in klist -ekt [path of stash, such as /home/haoqili/kdcfiles/keyStashFile])
• Test date. Navigate to src/kadmin/cli
  • delete 2nd argument in main of getdate.y
  • rm getdate.c
  • make getdate.c
  • gcc -o datetest -DTEST getdate.c -I../../include
  • ./datetest

• kadmind -nofork is useful in python because it tells it to wait first so that later processes can happen later and don't have to get timed out.

l0b = self.parentpath+'kadmind -nofork'

pl0b = Popen(l0b.split(), stdin=PIPE, stdout=PIPE, stderr=PIPE)

print "kadmind -nofork"

while (True):

l = pl0b.stderr.readline()

if l.find("starting") > -1: #for kadmind: starting ...

print l.strip()

break

Shell

• grep vs. egrep

The following characters have special meanings in grep or egrep:

In egrep:

| ^ $ . * + ? ( ) [ { } \

In grep:

^ $ . * \( \) [ \{ \} \

• 0 = STDIN, 1 = STDOUT, 2 = STDERR. Like blah 2> /dev/null puts blah's STDERR into /dev/null

• > overwrites, >> appends

not see what's writing: ksh filename > writefilename 2>&1, the 2>&1 writes the errors as well

see what's writing: ksh filename 2>&1 | tee writefilename

• ksh: typeset'ing vars in a function makes those vars local to the function.

Python
Common Stuff

• Cannot do [print line for line in linelist] must have a function that prints the line, call it, printl(), and do [printl(line) for line in linelist]

More Specific Stuff

• p = Popen('blah', stdin=PIPE, stdout=PIPE, stderr=PIPE)

(out, err) = p.communicate('inputThing\n') <-- don't forget the return "\n" at the end!

• When you're doing a bunch of p=Popen('shell command') be careful because Popen starts a new branch so the next Popen might start without the previous one having completed. To fix this problem, put in:

if int(p.wait()) != 0: #meaning that it's not executed

print "error message"

exit

• Two ways to display outputs after Popen( a command that has to get into something, in my case, getting into kadmin.local) 06262009

Way 1:

p = Popen(['commannd', 'all', 'in', 'one', 'line'], stdin=PIPE, stdout=PIPE, stderr=PIPE) #e.g. ['kadmin.local', '-q', 'listprincs']

if int(p.wait()) != 0:

print p.stdout.readlines()

Way 2:

p = Popen(['command', 'front', 'chunk'], stdin=PIPE, stdout=PIPE, stderr=PIPE) #e.g. ['kadmin.local']

(out, err) = p.communicate('rest of command') #e.g. 'listprincs'

print out

• Not type in a chunk of common code every time, i.e.

p = Popen(cmd, stdin=PIPE, stdout=PIPE, stderr=PIPE)

This can be changed to:

s = {stdin:PIPE, stdout=PIPE, stderr=PIPE}

p = Popen(cmd, **s)

• For putting in a shell command directly, can turn shell=True. Note the command here can be a single line of string, not split up.

p = Popen(command, shell=True, stdin=PIPE, stdout=PIPE, stderr=PIPE)

• The p.stdout.readlines() can be read only once

• Print current time in python:

from time import strftime

print "current time: "+strftime("%Y-%m-%d %H:%M:%S")

Output: current time: 2009-07-06 22:00:54

• Sleep for 7 seconds.

import time

time.sleep(7)

• Popen( env=blah ) this argument only needs to be specified when the environment is changing

MKM Errors Put Aside

• Adding the 1058th master key gives a memory error

• getdate.y has problems:

/trunk/src/kadmin/cli$ ./datetest

Enter date, or blank line to exit.

> 6 months

Sat Jan 9 14:22:36 2010

> 12/31/2009

Wed Dec 30 23:00:00 2009

> 07/10/2009

Thu Jul 9 23:00:00 2009

> 01/01/2009

Wed Dec 31 23:00:00 2008

> 01/01/2009 00:00:00

Wed Dec 31 23:00:00 2008

• Phantom list_mkey error after adding -e aes128-cts-hmac-sha1-96. The error went away after I ran the ksh equivalent of the python test. I don't know why it went away because everything seemed to be the same.

for lines 283-289:
print "Testing add_mkey with aes128 enctype
=============================================="
kdb5_util add_mkey -e aes128-cts-hmac-sha1-96 <<EOF
abcde
abcde
EOF
kdb5_util list_mkeys
print "Testing add_mkey with aes128 enctype done
=============================================="

The list_mkeys at the bottom is giving the following error:

kdb5_util: Unable to decrypt latest master key with the provided master key
 while getting master key list
kdb5_util: Warning: proceeding without master key list
kdb5_util: master keylist not initialized

Getting LDAP Running

• I followed the directions on this website http://openldap.org/doc/admin24/quickstart.html
• Install BerkeleyDB
  • Download berkeleydb4.7
  • cd to folder
  • cd build_unix (on my Ubuntu)
  • ../dist/configure
  • make
  • sudo make install
• Install Open LDAP
  • ./configure (fails)

ERROR: DBD/HDB:BerkeleyDB not available

Fixed: CPPFLAGS="-I/usr/local/BerkeleyDB4.7/include" then export CPPFLAGS

• • ./configure
  • make depend
  • make (fails)

ERROR: getpeereid.c:65: error: storage size of ‘peercred’ isn’t known

FIXED: CPPFLAGS=-D_GNU_SOURCE then export CPPFLAGS

• • make
  • make test (takes a while)
  • sudo make install (installed in /usr/local/etc/openldap)
• Change configuration file at /usr/local/etc/openldap/slapd.conf
  • <my-domain> <-- example
  • <com> <-- com
  • password is still "secret"
  • cn is still "Manager"
• Start SLAPD: sudo /usr/local/libexec/slapd
  • Check if it works by a search: ldapsearch blah
• Add entries. Consult link above.

What I should have done. Faster, simpler. Directions given by Greg Hudson. 1. sudo apt-get install slapd (for server program)
2. sudo apt-get install ldap-utils (for ldapsearch)
3. copy src/plugins/kdb/ldap/libkdb_ldap/kerberos.schema into /etc/ldap/schema
4. In /etc/default/slapd, change SLAPD_SERVICES="ldapi:///", to restrict access to the local machine
5. ldapsearch test:

ldapsearch -H ldapi:/// -x -W -D cn=Manager,dc=example,dc=com -LLL -b dc=example,dc=com

-H ldapi:/// indicate the URI for the LDAP server

-x simple authentication

-W password prompt

-D cn=Manager,dc=example,dc=com specify the "bind DN", like a username

-LLL shortens output

-b specify base of query to restrict the scope of the query

6. sudo apt-get install libldap2-dev

I thought I didn't have to do steps 1 and 2 since I installed the whole thing. However, I got stuck on step 4 because /etc/default/slapd doesn't exist. So I tried to install 1 and 2, but got the following error:

Setting up slapd (2.4.15-1ubuntu3) ...
  Creating new user openldap... done.
  Creating initial slapd configuration... Loading the initial configuration from the ldif file (/tmp/slapd_init.ldif.KSWxQODikd) failed with the following
error while running slapadd:
    str2entry: invalid value for attributeType objectClass #0 (syntax 1.3.6.1.4.1.1466.115.121.1.38)
    slapadd: could not parse entry (line=16)
dpkg: error processing slapd (--configure):
 subprocess post-installation script returned error exit status 1
Processing triggers for libc6 ...
ldconfig deferred processing now taking place
Errors were encountered while processing:
 slapd
E: Sub-process /usr/bin/dpkg returned an error code (1)</font>

ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1)

It can be fixed if slapd is started more specifically: sudo /usr/local/libexec/slapd -h ldapi:///