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1 intentionally left blank
2 getting django to play with old friends
3 getting django to play with old friends or foes
4 Lynn Root River Bar, 2013 Red roguelynn roguelynn.com
5 Lynn Root freeipa.org
6 Lynn Root freeipa.org IPA!= India Pale Ale
7 Lynn Root freeipa.org IPA == Identity, Policy, Audit
8 Lynn Root freeipa.org IPA == Identity, Policy, Audit Alpha
9 Playbill ELI5: Kerberos Setting up Custom User External Authentication External Permissions
10 rogue.ly/kerberos
11
12 Problem: Make an internal web app.
13 Question: Can I use Postgres for auth?
14 Crap. I have to use single sign-on.
15 ELI-5: Kerberos
16 5-year-old you
17 who wants to play games
18 but you must ask Dad for $$
19 so you can buy a ticket to play
20 so Dad gives you a few bucks
21 and you go to the clerk to buy a ticket to play
22 your money is good, so the clerk gives you a ticket for the game
23 a ticket that only you can use
24 because ticket as some super secret special DNA/fingerprint tech
25 now you can play!
26 (until your money runs out)
27 ELI-25: Kerberos protocol for authentication based on tickets and keytabs avoids sending passwords over the internetz symmetric-key crypto
28 KDC Clients Key Distribution Center Authentication You Server HTTP service Ticket Granting Server Kerberos Realm
29 Authentication You Server plaintext request your ID, Ticket Granting Server ID, IP address, lifetime
30 Authentication You Server user ID lookup in KDC
31 Authentication You Server Ticket Granting Server Session Key HTTP service s ID, timestamp, lifetime, TGS Session Key Ticket Granting Ticket your ID, HTTP service ID, IP address, timestamp, lifetime, and the TGS Session Key
32 Authentication You Server Ticket Granting Server Session Key Your Secret Key Ticket Granting Ticket Ticket Granting Server Secret Key
33 plaintext request HTTP Service ID and lifetime Ticket Granting You Server Authenticator your ID and timestamp Ticket Granting Ticket your ID, HTTP service ID, IP address, timestamp, lifetime, and the TGS Session Key
34 Ticket Granting You Server HTTP service lookup in KDC
35 plaintext request Ticket Granting You Server Authenticator Ticket Granting Server Session Key Ticket Granting Ticket Ticket Granting Server Secret Key
36 Ticket Granting You Server HTTP Service Session Key your client ID and timestamp Ticket for HTTP Service your ID, HTTP service ID, IP address, timestamp, lifetime, and the TGS Session Key
37 Ticket Granting You Server HTTP Service Session Key Ticket Granting Server Session Key Ticket for HTTP Service HTTP Service Secret Key
38 Ticket for HTTP Service You your ID, HTTP service ID, IP address, timestamp, lifetime, and the TGS Session Key HTTP service Authenticator your client ID and timestamp
39 Ticket for HTTP Service You HTTP Service Secret Key HTTP service Authenticator HTTP Service Session Key
40 You HTTP Authenticator HTTP service ID and timestamp service
41 You Authenticator HTTP HTTP Service Session Key service
42 You HTTP service
43 how can Django play with Kerberos?
44 leveraging new User models + antiquated authentication
45 ZOMG new user modelzz!1!! what does that mean?
46 allows custom user identifiers
47 ./manage.py startapp synegizerapp
48 user model:
49 # synergizerapp/models.py from django.contrib.auth.models import AbstractBaseUser class KerbUser(AbstractBaseUser): username = models.charfield(max_length=254,...) first_name = models.charfield(...) last_name = models.charfield(...) = models. field(...) synergy_level = models.integerfield() is_team_player = models.booleanfield(default=false) USERNAME_FIELD = 'username' REQUIRED_FIELDS = [' ', 'synergy_level']
50 user manager:
51 # synergizerapp/models.py from django.contrib.auth.models import ( AbstractBaseUser, BaseUserManager) class KerbUserManager(BaseUserManager): def create_user(self, , synergy_level, password=none): user = self.model( = , synergy_level=synergy_level) # <--snip--> return user def create_superuser(self, , synergy_level, password): user = self.create_user( , synergy_level, password=password) user.is_team_player = True user.save() return user
52 # synergizerapp/models.py from django.contrib.auth.models import ( AbstractBaseUser, BaseUserManager)... class KerbUser(AbstractBaseUser): # <--snip--> objects = KerbUserManager()
53 settings.py
54 # settings.py AUTH_USER_MODEL = 'synergizerapp.kerbuser' MIDDLEWARE_CLASSES = (... 'django.contrib.auth.middleware.authenticationmiddleware', 'django.contrib.auth.middleware.remoteusermiddleware',... ) AUTHENTICATION_BACKENDS = ( 'django.contrib.auth.backends.remoteuserbackends', ) team player!
55 STRATEGERY.COM
56 STRATEGERY.COM
57 Within Django App # synergizerapp/krb5.py from django.contrib.auth.backends import ( RemoteUserBackend) class Krb5RemoteUserBackend(RemoteUserBackend): def clean_username(self, username): # from username return username.split("@")[0] client-centric!!1!
58 # settings.py AUTH_USER_MODEL = 'synergizerapp.kerbuser' MIDDLEWARE_CLASSES = (... 'django.contrib.auth.middleware.authenticationmiddleware', 'django.contrib.auth.middleware.remoteusermiddleware',... ) AUTHENTICATION_BACKENDS = ( 'synergizerapp.krb5.krb5remoteuserbackend', ) a streamlining team player!
59 Within Apache # /etc/httpd/conf.d/remote_user.conf <Location /> AuthType Kerberos # <--snip--> KrbLocalUserMapping On # <--snip--> </Location>
60 Accessing the user
61 HTTP Request HTTP Response Some Middleware Some more Middleware AuthenticationMiddleware Even more Middleware Django view functions
62 HTTP Request HTTP Response Some Middleware Some more Middleware RemoteUserMiddleware Even more Middleware Django view functions
63 Accessing user user = request.meta["remote_user"]
64 Accessing user user = request.meta["remote_user"] pointyhairedboss
65 how do I Apache?
66 environment: Kerberos + Apache
67 # /etc/httpd/conf.d/remote_user.conf LoadModule auth_kerb_module modules/mod_auth_kerb.so <Location /> AuthName "RiverBarKerberos" AuthType Kerberos KrbMethodNegotiate On KrbMethodK5Passwd Off KrbLocalUserMapping On KrbServiceName HTTP/riverbar.rootcloud.com KrbAuthRealms ROOTCLOUD.COM Krb5KeyTab /etc/http.keytab Require valid-user Order Deny,Allow Deny from all Satisfy any </Location>
68 # /etc/httpd/conf.d/remote_user.conf LoadModule auth_kerb_module modules/mod_auth_kerb.so <Location /> AuthName "RiverBarKerberos" AuthType Kerberos KrbMethodNegotiate On KrbMethodK5Passwd Off KrbLocalUserMapping On KrbServiceName HTTP/riverbar.rootcloud.com KrbAuthRealms ROOTCLOUD.COM Krb5KeyTab /etc/http.keytab Require valid-user Order Deny,Allow Deny from all Satisfy any </Location>
69 # /etc/httpd/conf.d/remote_user.conf LoadModule auth_kerb_module modules/mod_auth_kerb.so <Location /> AuthName "RiverBarKerberos" AuthType Kerberos KrbMethodNegotiate On KrbMethodK5Passwd Off KrbLocalUserMapping On KrbServiceName HTTP/riverbar.rootcloud.com KrbAuthRealms ROOTCLOUD.COM Krb5KeyTab /etc/http.keytab Require valid-user Order Deny,Allow Deny from all Satisfy any </Location>
70 mod_auth_kerb Enrolled host + service chown apache
71 # /etc/httpd/conf.d/remote_user.conf LoadModule auth_kerb_module modules/mod_auth_kerb.so <Location /> AuthName "RiverBarKerberos" AuthType Kerberos KrbMethodNegotiate On KrbMethodK5Passwd Off KrbLocalUserMapping On KrbServiceName HTTP/riverbar.rootcloud.com KrbAuthRealms ROOTCLOUD.COM Krb5KeyTab /etc/http.keytab Require valid-user Order Deny,Allow Deny from all Satisfy any </Location>
72 # /etc/httpd/conf.d/remote_user.conf LoadModule auth_kerb_module modules/mod_auth_kerb.so <Location /> AuthName "RiverBarKerberos" AuthType Kerberos KrbMethodNegotiate On KrbMethodK5Passwd Off KrbLocalUserMapping On KrbServiceName HTTP/riverbar.rootcloud.com KrbAuthRealms ROOTCLOUD.COM Krb5KeyTab /etc/http.keytab Require valid-user Order Deny,Allow Deny from all Satisfy any </Location>
73 # /etc/httpd/conf.d/remote_user.conf LoadModule auth_kerb_module modules/mod_auth_kerb.so <Location /> AuthName "RiverBarKerberos" AuthType Kerberos KrbMethodNegotiate On KrbMethodK5Passwd Off KrbLocalUserMapping On KrbServiceName HTTP/riverbar.rootcloud.com KrbAuthRealms ROOTCLOUD.COM Krb5KeyTab /etc/http.keytab Require valid-user Order Deny,Allow Deny from all Satisfy any </Location>
74 does it negotiate?
75 curl requests.py browsers
76 $ curl --negotiate -u : $FQDN
77 kinit roguelynn Password for klist Ticket cache: DIR::/run/user/1000/krb5cc/tktkPmrOq Default principal: Valid starting Expires 06/16/ :02:21 06/17/ :02:18 Service principal
78 kinit roguelynn Password for klist Ticket cache: DIR::/run/user/1000/krb5cc/tktkPmrOq Default principal: Valid starting Expires 06/16/ :02:21 06/17/ :02:18 Service principal
79 kinit roguelynn Password for klist Ticket cache: DIR::/run/user/1000/krb5cc/tktkPmrOq Default principal: Valid starting Expires 06/16/ :02:21 06/17/ :02:18 Service principal
80 kinit roguelynn Password for klist Ticket cache: DIR::/run/user/1000/krb5cc/tktkPmrOq Default principal: Valid starting Expires 06/16/ :02:21 06/17/ :02:18 Service principal
81 kinit roguelynn Password for curl -I --negotiate -u : \ HTTP/ Unauthorized Date: Wed, 15 May :10:18 GMT Server: Apache/2.4.4 (Fedora) WWW-Authenticate: Negotiate Content-type text/html; charset=iso HTTP/ Date: Wed, 15 May :10:18 GMT Server: Apache/2.4.4 (Fedora) WWW-Authenticate: Negotiate some_random_t0k3n
82 kinit roguelynn Password for curl -I --negotiate -u : \ HTTP/ Unauthorized Date: Wed, 15 May :10:18 GMT Server: Apache/2.4.4 (Fedora) WWW-Authenticate: Negotiate Content-type text/html; charset=iso HTTP/ Date: Wed, 15 May :10:18 GMT Server: Apache/2.4.4 (Fedora) WWW-Authenticate: Negotiate some_random_t0k3n ticket cache
83 kinit roguelynn Password for curl -I --negotiate -u : \ HTTP/ Unauthorized Date: Wed, 15 May :10:18 GMT Server: Apache/2.4.4 (Fedora) WWW-Authenticate: Negotiate Content-type text/html; charset=iso HTTP/ Date: Wed, 15 May :10:18 GMT Server: Apache/2.4.4 (Fedora) WWW-Authenticate: Negotiate some_random_t0k3n two responses
84 klist Ticket cache: DIR::/run/user/1000/krb5cc/tktkPmrOq Default principal: Valid starting Expires 06/16/ :02:21 06/17/ :02:18 06/16/ :02:21 06/17/ :02:18 Service principal ticket for HTTP service
85 curl requests.py browsers
86 authentication vs authorization
87 authentication vs authorization
88 accessing permissions
89 accessing permissions Connecting to LDAP Calling system commands PAM stack + Apache modules: mod_auth_kerb mod_authnz_external
90 LDAP is user a member of admins, or team players, or movers and shakers,...
91 getxxx system calls: SSSD e.g. getent group $USER conveniently accesses group information stored in IPA LDAP Python wrapper: getent package
92 Apache modules mod_auth_kerb for authentication mod_authnz_external + pwauth to defer to PAM for group lookup pwauth will need a bit of a hack to accept Kerb auth
93 your own kerberos test environment: rogue.ly/kerberos
94 word of caution: do NOT install IPA on your local machine!
95 In review custom user model with SSO integrate Django apps with SSO access permissions for your app
96 Crap. Now I m the point person for this.
97 @roguelynn rogue.ly/kerberos
98 Background image: abstract_flying_elephants_circus_simplistic_simple_1920x1080_wallpaper_29579
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