Latest revision as of 05:20, 22 April 2019

How to install NFSv4 with Kerberos authentication on Debian Squeeze

References:

http://wiki.debian.org/NFS/Kerberos

Server

Packages

nfs-kernel-server

apt-get install nfs-kernel-server

Configuration

/etc/default/nfs-common

[...]
# Do you want to start the idmapd daemon? It is only needed for NFSv4.
NEED_IDMAPD=yes

# Do you want to start the gssd daemon? It is required for Kerberos mounts.
NEED_GSSD=yes

/etc/default/nfs-kernel-server

NEED_SVCGSSD=yes

/etc/krb5.conf

Enable allow_weak_crypto in libdefaults section

[libdefaults]
        default_realm = COINCOIN.EU
        allow_weak_crypto = true
        permitted_enctypes = des-cbc-crc # needed nfs-utils version of clients >= 1.2.3 (see debian bug #474037, nfs-utils commit 76be349d5dd07f55797cb9920cc275667258f10f)

Create needed directory

kdc:/root# mkdir /mnt/sdb1
kdc:/root# mkdir -p /export/Documents

/etc/exports

/export gss/krb5p(rw,async,no_subtree_check,crossmnt,fsid=0)
/export/Documents  gss/krb5p(rw,async,no_subtree_check)

/etc/fstab

# [...]
/dev/sdb1           /mnt/sdb1         ext3 defaults,acl 1       2
/mnt/sdb1/Documents /export/Documents none ro,bind      0       0

mount directory

kdc:/root# mount /mnt/sdb1
kdc:/root# mount /export/Documents

Export directories

kdc:/root# exportfs -rv
exporting gss/krb5p:/export/Documents
exporting gss/krb5p:/export

NFS service: Create principal entry

kdc:/root# kadmin.local
Authenticating as principal root/admin@COINCOIN.EU with password.
kadmin:  addprinc -randkey nfs/kdc.coincoin.eu
WARNING: no policy specified for nfs/kdc.coincoin.eu@COINCOIN.EU; defaulting to no policy
Principal "nfs/kdc.coincoin.eu@COINCOIN.EU" created.

export nfs@kdc principal to the keytab

kdc:/root# kadmin.local
Authenticating as principal root/admin@COINCOIN.EU with password.
ktadd -e des-cbc-crc:normal -k /etc/krb5.keytab nfs/kdc.coincoin.eu

You can list content of keytab:

kdc:~# ktutil 
ktutil:  rkt /etc/krb5.keytab 
ktutil:  list
slot KVNO Principal
---- ---- ---------------------------------------------------------------------
   1    2    nfs/kdc.coincoin.eu@COINCOIN.EU

Create client entry

kdc:/root# kadmin.local
kadmin:  addprinc -randkey nfs/client.coincoin.eu
WARNING: no policy specified for nfs/client.coincoin.eu@COINCOIN.EU; defaulting to no policy
Principal "nfs/client.coincoin.eu@COINCOIN.EU" created.

Start services

/etc/init.d/nfs-common start
/etc/init.d/nfs-kernel-server start

Client

Packages

apt-get install nfs-client

Configuration

/etc/krb5.conf

Enable allow_weak_crypto in libdefaults section

[libdefaults]
        default_realm = COINCOIN.EU
        allow_weak_crypto = true

/etc/fstab

kdc.coincoin.eu:/Documents /mnt/Documents nfs4 sec=krb5p,rw,hard,rsize=32768,wsize=32768,noexec,nosuid,auto 0  0

Check DNS configuration

root@client:/root# host kdc.coincoin.eu
kdc.coincoin.eu has address 192.168.20.123
root@client:/root# host 192.168.20.123
123.20.168.192.in-addr.arpa domain name pointer kdc.coincoin.eu.

/etc/default/nfs-common

[...]
# Do you want to start the idmapd daemon? It is only needed for NFSv4.
NEED_IDMAPD=yes

# Do you want to start the gssd daemon? It is required for Kerberos mounts.
NEED_GSSD=yes

Start services

/etc/init.d/nfs-common restart

Create keytab

client:/root# kadmin -p superuser
Authenticating as principal superuser with password.
Password for superuser@COINCOIN.EU: 
ktadd -e des-cbc-crc:normal -k /etc/krb5.keytab nfs/client.coincoin.eu

Errors

Additional pre-authentication required

/var/log/kerberos/krb5kdc.log:

Mar 01 01:10:57 kdc krb5kdc[2608](info): AS_REQ (7 etypes {18 17 16 23 1 3 2}) 192.168.25.3: NEEDED_PREAUTH: nfs/kdc.coincoin.eu@COINCOIN.EU for krbtgt/COINCOIN.EU@COINCOIN.EU, Additional pre-authentication required

check allow_weak_crypto in /etc/krb5.conf of server and client

rpc.nfsd: unable to set any sockets for nfsd

Add 127.0.0.1 in /etc/hosts.allow for service portmap or rpcbind

No supported encryption types (config file error?)

In daemon.log:

Feb  4 03:42:11 kdc rpc.svcgssd[3126]: ERROR: GSS-API: error in handle_nullreq: gss_accept_sec_context(): GSS_S_FAILURE (Unspecified GSS failure.  Minor code may provide more information) - No supported encryption types (config file error?)

Update the kernel.

Increase verbosity

server

/etc/default/nfs-kernel-server

RPCSVCGSSDOPTS=-vvvvvvvvv

server and client

/etc/init.d/nfs-common

RPCGSSDOPTS=-vvvvvvvvvvvvvv

Replace

start-stop-daemon --start --oknodo --quiet \
--exec /usr/sbin/rpc.idmapd

by

start-stop-daemon --start --oknodo --quiet \
--exec /usr/sbin/rpc.idmapd -- -vvvvvvvvvvvvvvv

TODO

details client:/root# kadmin -p superuser
/etc/idmapd.conf

Performances

network: 100Mbps, server: Atom D525 and 2Go, client: Core i7 and 2Go
- krb5/krb5i/krb5p: no difference when moving a file ~ 1 minute 6 sec

@@ Line 9: / Line 9: @@
 == Packages ==
-* nfs-kernel-server
+=== nfs-kernel-server ===
 <pre><nowiki>
@@ Line 16: / Line 16: @@
 == Configuration ==
+=== /etc/default/nfs-common ===
-* /etc/krb5.conf enable allow_weak_crypto in libdefaults section
-** [http://comments.gmane.org/gmane.linux.nfsv4/11322   nfsv4 and encryption types ]
+<pre><nowiki>
-** [http://git.kernel.org/?p=linux/kernel/git/longterm/linux-2.6.35.y.git;a=history;f=net/sunrpc/auth_gss/gss_krb5_mech.c;h=032644610524306ea0e01383b3c4ea54888b10ab;hb=HEAD   Note that RC4-HMAC, 3DES, AES128 and AES256 seem supported in recent kernel]
+[...]
+# Do you want to start the idmapd daemon? It is only needed for NFSv4.
+NEED_IDMAPD=yes
+# Do you want to start the gssd daemon? It is required for Kerberos mounts.
+NEED_GSSD=yes
+</nowiki></pre>
+=== /etc/default/nfs-kernel-server ===
+<pre><nowiki>
+NEED_SVCGSSD=yes
+</nowiki></pre>
+=== /etc/krb5.conf ===
+Enable allow_weak_crypto in libdefaults section
+* [http://comments.gmane.org/gmane.linux.nfsv4/11322   nfsv4 and encryption types ]
+* [http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=history;f=net/sunrpc/auth_gss/gss_krb5_mech.c;h=8c67890de427e35a01e2777db805d0366bea0c8c;hb=HEAD   Note that RC4-HMAC, 3DES, AES128 and AES256 is supported in recent kernel]
 <pre><nowiki>
@@ Line 24: / Line 44: @@
         default_realm = COINCOIN.EU
         allow_weak_crypto = true
+        permitted_enctypes = des-cbc-crc # needed nfs-utils version of clients >= 1.2.3 (see debian bug #474037, nfs-utils commit 76be349d5dd07f55797cb9920cc275667258f10f)
 </nowiki></pre>
-* Create needed directory
+=== Create needed directory ===
 <pre><nowiki>
-host:/root# mkdir /mnt/sdb1
+kdc:/root# mkdir /mnt/sdb1
-host:/root# mkdir -p /export/Documents
+kdc:/root# mkdir -p /export/Documents
 </nowiki></pre>
-* /etc/exports
+=== /etc/exports ===
 <pre><nowiki>
@@ Line 40: / Line 63: @@
 </nowiki></pre>
-* /etc/fstab
+=== /etc/fstab ===
 <pre><nowiki>
@@ Line 48: / Line 72: @@
 </nowiki></pre>
-* mount directory
+=== mount directory ===
 <pre><nowiki>
-host:/root# mount /mnt/sdb1
+kdc:/root# mount /mnt/sdb1
-host:/root# mount /export/Documents
+kdc:/root# mount /export/Documents
 </nowiki></pre>
-* Export directories
+=== Export directories ===
 <pre><nowiki>
-host:/root# exportfs -rv
+kdc:/root# exportfs -rv
 exporting gss/krb5p:/export/Documents
 exporting gss/krb5p:/export
 </nowiki></pre>
+=== NFS service: Create principal entry ===
+<pre><nowiki>
+kdc:/root# kadmin.local
+Authenticating as principal root/admin@COINCOIN.EU with password.
+kadmin:  addprinc -randkey nfs/kdc.coincoin.eu
+WARNING: no policy specified for nfs/kdc.coincoin.eu@COINCOIN.EU; defaulting to no policy
+Principal "nfs/kdc.coincoin.eu@COINCOIN.EU" created.
+</nowiki></pre>
+=== export nfs@kdc principal to the keytab ===
+<pre><nowiki>
+kdc:/root# kadmin.local
+Authenticating as principal root/admin@COINCOIN.EU with password.
+ktadd -e des-cbc-crc:normal -k /etc/krb5.keytab nfs/kdc.coincoin.eu
+</nowiki></pre>
+You can list content of keytab:
+<pre><nowiki>
+kdc:~# ktutil
+ktutil:  rkt /etc/krb5.keytab
+ktutil:  list
+slot KVNO Principal
+---- ---- ---------------------------------------------------------------------
+2    nfs/kdc.coincoin.eu@COINCOIN.EU
+</nowiki></pre>
+=== Create client entry ===
+<pre><nowiki>
+kdc:/root# kadmin.local
+kadmin:  addprinc -randkey nfs/client.coincoin.eu
+WARNING: no policy specified for nfs/client.coincoin.eu@COINCOIN.EU; defaulting to no policy
+Principal "nfs/client.coincoin.eu@COINCOIN.EU" created.
+</nowiki></pre>
+== Start services ==
+* /etc/init.d/nfs-common start
+* /etc/init.d/nfs-kernel-server start
 = Client =
@@ Line 75: / Line 146: @@
 == Configuration ==
-* /etc/krb5.conf
+=== /etc/krb5.conf ===
 Enable allow_weak_crypto in libdefaults section
@@ Line 84: / Line 155: @@
 </nowiki></pre>
-* /etc/fstab
+=== /etc/fstab ===
 <pre><nowiki>
@@ Line 91: / Line 163: @@
-* Check DNS configuration
+=== Check DNS configuration ===
 <pre><nowiki>
@@ Line 101: / Line 173: @@
-* /etc/default/nfs-common
+=== /etc/default/nfs-common ===
 <pre><nowiki>
@@ Line 112: / Line 184: @@
 </nowiki></pre>
-* Start services
+=== Start services ===
 <pre><nowiki>
 /etc/init.d/nfs-common restart
+</nowiki></pre>
+=== Create keytab ===
+<pre><nowiki>
+client:/root# kadmin -p superuser
+Authenticating as principal superuser with password.
+Password for superuser@COINCOIN.EU:
+ktadd -e des-cbc-crc:normal -k /etc/krb5.keytab nfs/client.coincoin.eu
+</nowiki></pre>
+= Errors =
+== Additional pre-authentication required ==
+/var/log/kerberos/krb5kdc.log:
+<pre><nowiki>
+Mar 01 01:10:57 kdc krb5kdc[2608](info): AS_REQ (7 etypes {18 17 16 23 1 3 2}) 192.168.25.3: NEEDED_PREAUTH: nfs/kdc.coincoin.eu@COINCOIN.EU for krbtgt/COINCOIN.EU@COINCOIN.EU, Additional pre-authentication required
+</nowiki></pre>
+check allow_weak_crypto in /etc/krb5.conf of server and client
+== rpc.nfsd: unable to set any sockets for nfsd ==
+Add 127.0.0.1 in /etc/hosts.allow for service portmap or rpcbind
+==  No supported encryption types (config file error?) ==
+In daemon.log:
+<pre><nowiki>
+Feb  4 03:42:11 kdc rpc.svcgssd[3126]: ERROR: GSS-API: error in handle_nullreq: gss_accept_sec_context(): GSS_S_FAILURE (Unspecified GSS failure.  Minor code may provide more information) - No supported encryption types (config file error?)
+</nowiki></pre>
+Update the kernel.
+== Increase verbosity ==
+=== server ===
+==== /etc/default/nfs-kernel-server ====
+<pre><nowiki>
+RPCSVCGSSDOPTS=-vvvvvvvvv
+</nowiki></pre>
+=== server and client ===
+==== /etc/init.d/nfs-common ====
+<pre><nowiki>
+RPCGSSDOPTS=-vvvvvvvvvvvvvv
+</nowiki></pre>
+Replace
+<pre><nowiki>
+start-stop-daemon --start --oknodo --quiet \
+--exec /usr/sbin/rpc.idmapd
+</nowiki></pre>
+by
+<pre><nowiki>
+start-stop-daemon --start --oknodo --quiet \
+--exec /usr/sbin/rpc.idmapd -- -vvvvvvvvvvvvvvv
 </nowiki></pre>
 == TODO ==
+* details client:/root# kadmin -p superuser
+* /etc/idmapd.conf
+= Performances =
-keytab part
+* network: 100Mbps, server: Atom D525 and 2Go, client: Core i7 and 2Go
+** krb5/krb5i/krb5p: no difference when moving a file ~ 1 minute 6 sec

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KerberosNFSv4: Difference between revisions

Latest revision as of 05:20, 22 April 2019

Server

Packages

nfs-kernel-server

Configuration

/etc/default/nfs-common

/etc/default/nfs-kernel-server

/etc/krb5.conf

Create needed directory

/etc/exports

/etc/fstab

mount directory

Export directories

NFS service: Create principal entry

export nfs@kdc principal to the keytab

Create client entry

Start services

Client

Packages

Configuration

/etc/krb5.conf

/etc/fstab

Check DNS configuration

/etc/default/nfs-common

Start services

Create keytab

Errors

Additional pre-authentication required

rpc.nfsd: unable to set any sockets for nfsd

No supported encryption types (config file error?)

Increase verbosity

server

/etc/default/nfs-kernel-server

server and client

/etc/init.d/nfs-common

TODO

Performances

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