基于sasl认证配置libvirt

2022-03-24 01:01:00

Username and Password Authentication with SASL

SASL provides username and password authentication as well as data encryption (digest-md5, by default).

Since SASL maintains its own user database, the users do not need to exist on the VM Host Server.

SASL is required by TCP connections and on top of TLS/SSL connections.

To configure SASL authentication, proceed as follows:

修改 /etc/libvirt/libvirtd.conf :

#To enable SASL for TCP connections:
auth_tcp = "sasl"

#To enable SASL for TLS/SSL connections:
auth_tls = "sasl"

重启libvirtd

systemctl restart libvirtd

The libvirt SASL configuration file is located at /etc/sasl2/libvirtd.conf. Normally, there is no need to change the defaults. However, if using SASL on top of TLS, you may turn off session encryption to avoid additional overhead— TLS connections are already encrypted— by commenting the mech_list. For TCP connections this parameter must be set to digest-md5:

mech_list: digest-md5 # mandatory for TCP connections
#mech_list: digest-md5 # apply default (username+password) TLS/SSL only!
By default, no SASL users are configured, so no logins are possible. Use the following commands to add, list, and delete users:

mercury:~ # saslpasswd2 -a libvirt foxchan                  # add user foxchan
Password: 
Again (for verification): 

mercury:~ # sasldblistusers2 -f /etc/libvirt/passwd.db    # list users
foxchan@mercury.example.com: userPassword
mercury:~ # saslpasswd2 -a libvirt -d foxchan                        # delete user foxchan

如果使用qemu+tcp://连接，则应该enable digest-md5，这样交互会被加密。
如果使用qemu+tls://连接，则应该disable digest-md5，这样交互就不会被md5加密一次，然后再被TLS加密一次
修改/etc/libvirt/libvirtd.conf

listen_tls = 1

listen_tcp = 1

#对于unix socket我们不auth

auth_unix_ro = "none"

auth_unix_rw = "none"

tls_port = "16514"

tcp_port = "16509"

#属于这个group的则放行

unix_sock_group = "libvirtd"

unix_sock_ro_perms = "0777"

unix_sock_rw_perms = "0770"

#对于tcp或者tls则auth

auth_tcp = "sasl"

#对于tls需要configure下面的

auth_tls = "sasl"

key_file = "/etc/pki/libvirt/private/serverkey.pem"

cert_file = "/etc/pki/libvirt/servercert.pem"

ca_file = "/etc/pki/CA/cacert.pem"

创建key和certificate

/////////////////////////////Create the Certificate Authority Certificate

cat certificate_authority_template.info

cn = libvirt.org
ca
cert_signing_key

apt-get install gnutls-bin

(umask 277 && certtool --generate-privkey > certificate_authority_key.pem)

cat certificate_authority_key.pem

root@popsuper1982:/home/cliu8/keys/certtool# ls -la certificate_authority_key.pem
-r-------- 1 root root 1972 Jul 15 22:28 certificate_authority_key.pem

certtool --generate-self-signed --template certificate_authority_template.info --load-privkey certificate_authority_key.pem --outfile certificate_authority_certificate.pem

Generating a self signed certificate...
X.509 Certificate Information:
Version: 3
Serial Number (hex): 53c53b4d
Validity:
Not Before: Tue Jul 15 14:31:41 UTC 2014
Not After: Wed Jul 15 14:31:41 UTC 2015
Subject: CN=libvirt.org
Subject Public Key Algorithm: RSA
Certificate Security Level: Normal
Modulus (bits 2432):
00:e9:59:61:58:f3:f4:a0:db:7a:c1:57:48:5c:c4:19
5a:2c:b3:51:cf:2c:37:31:64:3f:52:bc:ea:f8:1b:db
3f:ed:95:7d:c1:0f:56:cd:4c:21:d5:a3:fd:93:78:29
87:ca:fe:1a:7b:79:01:c6:69:c1:d1:84:93:f7:6f:18
87:f9:5b:9f:7a:b8:c1:ac:ab:a8:8c:1f:fc:c9:d8:f5
29:b5:ea:1e:e3:3f:9d:f1:ff:56:83:ea:ed:48:30:ac
61:e5:39:46:22:53:97:57:09:6c:6c:58:de:7f:f5:a5
d8:46:46:79:19:4d:be:6f:1c:d0:2c:1c:8b:ef:1c:be
ca:96:5e:87:ef:36:83:7a:9b:1b:1e:03:18:71:60:70
f5:73:1b:11:e6:01:3e:87:43:b9:7a:aa:4b:01:99:21
69:76:4e:22:0e:e6:a5:bc:23:48:d9:04:ad:1e:56:b7
90:8b:01:bb:bb:72:aa:f9:3c:ba:b1:9a:2a:d3:45:de
d3:84:82:4e:40:07:da:1f:e9:b7:47:3b:96:6d:e0:f8
1b:b0:c1:98:d0:df:9b:c9:f9:c6:d9:32:58:43:8e:9a
e6:6a:a7:6f:a9:c2:df:c8:60:7b:87:f5:d1:f4:25:1a
c4:3c:bb:17:fe:83:a1:06:48:8b:a5:1a:b3:00:91:d9
26:2a:8d:73:dc:e5:a1:85:a4:1a:29:1f:1d:c1:fb:14
4f:51:8f:4b:9c:19:15:49:7c:de:3d:0e:cb:47:84:b6
ff:d2:dd:1e:2a:d6:77:59:18:df:c1:82:39:a4:0f:47
51
Exponent (bits 24):
01:00:01
Extensions:
Basic Constraints (critical):
Certificate Authority (CA): TRUE
Key Usage (critical):
Certificate signing.
Subject Key Identifier (not critical):
f113e5356c2b30271aa1f1bb6183676edee28ed7
Other Information:
Public Key Id:
f113e5356c2b30271aa1f1bb6183676edee28ed7

Signing certificate...

cat certificate_authority_certificate.pem

# ls -la certificate_authority_certificate.pem
-r-------- 1 root root 1204 Jul 15 22:31 certificate_authority_certificate.pem

# cp certificate_authority_certificate.pem /etc/pki/CA/cacert.pem

chmod 444 /etc/pki/CA/cacert.pem

scp -r certificate_authority_certificate.pem cliu8@16.158.166.197:/home/cliu8/

on 16.158.166.197
cp certificate_authority_certificate.pem /etc/pki/CA/cacert.pem

/////////////////////////Creating Transport Layer Security Server Certificates for libvirt

cat popsuper1982_server_template.info

organization = libvirt.org
cn = popsuper1982
tls_www_server
encryption_key
signing_key

(umask 277 && certtool --generate-privkey > popsuper1982_server_key.pem)

Generating a 2432 bit RSA private key...

certtool --generate-certificate --template popsuper1982_server_template.info --load-privkey popsuper1982_server_key.pem --load-ca-certificate certificate_authority_certificate.pem --load-ca-privkey certificate_authority_key.pem --outfile popsuper1982_server_certificate.pem

Generating a signed certificate...
X.509 Certificate Information:
Version: 3
Serial Number (hex): 53c55255
Validity:
Not Before: Tue Jul 15 16:09:57 UTC 2014
Not After: Wed Jul 15 16:09:57 UTC 2015
Subject: O=libvirt.org,CN=popsuper1982
Subject Public Key Algorithm: RSA
Certificate Security Level: Normal
Modulus (bits 2432):
00:ca:e5:92:4f:d8:14:f4:e2:26:26:88:5a:b4:fd:0e
ee:86:c6:e8:15:b2:4f:36:6d:8a:b1:23:75:80:b1:0a
72:e0:6c:a0:06:ce:03:43:12:2c:6f:e9:ee:bf:21:d2
93:82:02:74:14:50:17:fc:f8:21:ec:a6:66:29:9f:d7
c3:63:35:50:82:f2:30:9a:12:3b:3e:5a:d1:68:29:7a
eb:18:10:7a:69:f8:0b:aa:1a:d9:2d:8b:e4:b3:1b:81
c7:de:a8:9f:08:1d:d0:85:db:af:cc:08:00:9b:c1:5a
31:f8:9a:43:01:42:88:11:91:35:73:df:57:b9:ce:83
34:91:70:ee:29:4b:88:dd:f2:7a:16:1d:c1:36:4d:8b
28:7b:05:ba:42:b1:63:8a:92:f8:3d:0c:d1:a2:d8:24
92:29:de:c7:8a:73:1d:1e:ec:d3:72:4a:7e:7a:a1:43
85:fa:85:ab:58:a3:67:03:4a:48:62:04:b3:f4:8e:f5
f0:16:fb:24:28:75:d7:1d:43:52:bc:08:9d:3e:d0:38
7d:36:9b:1b:f5:81:0c:17:fd:ba:1b:10:bb:1b:69:cf
eb:c1:54:4e:99:ed:ff:15:71:11:9a:63:31:9d:0f:7b
b2:31:a2:4c:49:2a:ee:d1:3c:80:c0:98:e0:6c:63:6b
52:9a:b5:d6:0b:6c:34:13:86:d6:ab:c4:4d:9a:ff:ae
be:60:b2:a7:e3:3d:b4:63:05:d3:f0:f9:69:01:35:97
1c:52:48:24:75:b5:73:96:b5:fb:bc:8e:2e:62:7c:5c
17
Exponent (bits 24):
01:00:01
Extensions:
Basic Constraints (critical):
Certificate Authority (CA): FALSE
Key Purpose (not critical):
TLS WWW Server.
Key Usage (critical):
Digital signature.
Key encipherment.
Subject Key Identifier (not critical):
0570b6cf340118f7d44dd67c0ca6ffbbb7a4871c
Authority Key Identifier (not critical):
f113e5356c2b30271aa1f1bb6183676edee28ed7
Other Information:
Public Key Id:
0570b6cf340118f7d44dd67c0ca6ffbbb7a4871c

Signing certificate...

cp popsuper1982_server_certificate.pem /etc/pki/libvirt/servercert.pem

cp popsuper1982_server_key.pem /etc/pki/libvirt/private/serverkey.pem

///////////////////////Creating Transport Layer Security Client Certificates for libvirt

# cat escto-bj-hp-z620_client_template.info 
country = CN
state = Beijing
locality = Beijing
organization = libvirt.org
cn = escto-bj-hp-z620
tls_www_client
encryption_key
signing_key

(umask 277 && certtool --generate-privkey > escto-bj-hp-z620_client_key.pem)

(umask 277 && certtool --generate-privkey > escto-bj-hp-z620_client_key.pem)
Generating a 2432 bit RSA private key...

certtool --generate-certificate --template escto-bj-hp-z620_client_template.info --load-privkey escto-bj-hp-z620_client_key.pem --load-ca-certificate certificate_authority_certificate.pem --load-ca-privkey certificate_authority_key.pem --outfile escto-bj-hp-z620_client_certificate.pem
Generating a signed certificate...
X.509 Certificate Information:
Version: 3
Serial Number (hex): 53c55678
Validity:
Not Before: Tue Jul 15 16:27:36 UTC 2014
Not After: Wed Jul 15 16:27:36 UTC 2015
Subject: C=CN,O=libvirt.org,L=Beijing,ST=Beijing,CN=escto-bj-hp-z620
Subject Public Key Algorithm: RSA
Certificate Security Level: Normal
Modulus (bits 2432):
00:9f:5c:d7:89:2c:0b:fe:e7:38:21:1d:2a:da:92:eb
82:91:96:3c:f3:22:28:a3:d6:3d:70:68:27:a1:2b:3a
3e:79:03:55:ea:1b:eb:1f:81:90:71:3d:41:4c:99:f2
96:46:22:e0:33:91:bb:5b:38:83:a5:3f:d7:0a:25:dd
f0:90:cf:0d:4a:18:b3:0d:db:01:5f:70:78:1b:63:01
ac:6f:32:8b:79:cc:51:0f:d4:45:1e:6f:b8:d8:84:57
af:ca:e8:3e:58:0a:79:89:0d:99:e2:8a:b2:2c:85:dc
40:15:7c:52:9b:46:66:a0:0f:6c:52:7d:e8:1b:b4:06
5a:d9:7f:30:84:d0:37:66:2a:3f:53:50:33:99:93:b7
8d:a2:74:cd:4d:ca:76:b5:df:2f:47:f9:e2:1a:7b:91
49:20:be:c9:ca:9b:f1:2c:f1:40:1a:66:37:2e:ac:23
3f:3d:44:de:0f:2d:d2:60:63:22:2d:49:28:98:c0:b7
9f:70:be:51:b8:d3:10:1d:40:3d:3e:6f:1a:f1:a2:1b
5c:2e:68:8b:05:99:7b:0b:5c:9c:78:54:8f:de:ae:7e
75:6d:fb:af:cc:ea:3c:be:9d:25:57:d1:3d:ef:27:66
c3:93:2f:62:f0:43:31:64:df:df:20:b6:b8:df:8a:85
77:38:9b:3d:85:e1:67:1b:e6:b4:9b:e0:30:4e:6c:62
c1:07:72:57:ad:bc:fc:f0:0c:d8:d4:12:ac:eb:80:ee
04:b2:b0:10:e4:d6:71:68:2b:ee:e6:98:23:9a:df:c7
95
Exponent (bits 24):
01:00:01
Extensions:
Basic Constraints (critical):
Certificate Authority (CA): FALSE
Key Purpose (not critical):
TLS WWW Client.
Key Usage (critical):
Digital signature.
Key encipherment.
Subject Key Identifier (not critical):
f4385711f8089b39ba2c13869aa816114d378190
Authority Key Identifier (not critical):
f113e5356c2b30271aa1f1bb6183676edee28ed7
Other Information:
Public Key Id:
f4385711f8089b39ba2c13869aa816114d378190

Signing certificate...

root@popsuper1982:/home/cliu8/keys/certtool# scp escto-bj-hp-z620_client_certificate.pem cliu8@16.158.166.197:/home/cliu8/
cliu8@16.158.166.197's password:
escto-bj-hp-z620_client_certificate.pem 100% 1379 1.4KB/s 00:00
root@popsuper1982:/home/cliu8/keys/certtool# scp escto-bj-hp-z620_client_key.pem cliu8@16.158.166.197:/home/cliu8/
cliu8@16.158.166.197's password:
escto-bj-hp-z620_client_key.pem 100% 1968 1.9KB/s 00:00

修改/etc/hosts文件

16.158.166.150 popsuper1982
16.158.166.197 escto-bj-hp-z620

修改/etc/default/libvirt-bin

#cat /etc/default/libvirt-bin

Defaults for libvirt-bin initscript (/etc/init.d/libvirt-bin)

This is a POSIX shell fragment

Start libvirtd to handle qemu/kvm:

start_libvirtd="yes"

options passed to libvirtd, add "-l" to listen on tcp

libvirtd_opts="-d -l"

pass in location of kerberos keytab

#export KRB5_KTNAME=/etc/libvirt/libvirt.keytab

重启libvirt-bin

root@popsuper1982:/home/cliu8# netstat -na | grep 16509
tcp 0 0 0.0.0.0:16509 0.0.0.0: LISTEN
tcp6 0 0 :::16509 ::: LISTEN
root@popsuper1982:/home/cliu8# netstat -na | grep 16514
tcp 0 0 0.0.0.0:16514 0.0.0.0: LISTEN
tcp6 0 0 :::16514 ::: LISTEN

注意对sasl的配置

cat /etc/sasl2/libvirt.conf

# If you want to use the non-TLS socket, then you *must* include
# the GSSAPI or DIGEST-MD5 mechanisms, because they are the only
# ones that can offer session encryption as well as authentication.
#
# If you're only using TLS, then you can turn on any mechanisms
# you like for authentication, because TLS provides the encryption
#
# Default to a simple username+password mechanism
mech_list: digest-md5

# Before you can use GSSAPI, you need a service principle on the
# KDC server for libvirt, and that to be exported to the keytab
# file listed below
#mech_list: gssapi
#
# You can also list many mechanisms at once, then the user can choose
# by adding  '?auth=sasl.gssapi' to their libvirt URI, eg
#   qemu+tcp://hostname/system?auth=sasl.gssapi
#mech_list: digest-md5 gssapi

# Some older builds of MIT kerberos on Linux ignore this option &
# instead need KRB5_KTNAME env var.
# For modern Linux, and other OS, this should be sufficient
#
# There is no default value here, uncomment if you need this
#keytab: /etc/libvirt/krb5.tab

# If using digest-md5 for username/passwds, then this is the file
# containing the passwds. Use 'saslpasswd2 -a libvirt [username]'
# to add entries, and 'sasldblistusers2 -f [sasldb_path]' to browse it
sasldb_path: /etc/libvirt/passwd.db

添加用户

saslpasswd2 -a libvirt test1

注意这里必须是libvirt，这是application的名字，只有输入libvirt，才会使用配置/etc/sasl2/libvirt.conf，结果才会写到/etc/libvirt/passwd.db

下面的命令才有正确的输出


sasldblistusers2 -f /etc/libvirt/passwd.db
test1@popsuper1982: userPassword

这个时候从远程登录tcp

$ virsh -c qemu+tcp://16.158.166.150/system list --all
Please enter your authentication name: test1@popsuper1982
Please enter your password: 
Id    Name                           State
----------------------------------------------------
-     ubuntu-14.04                   shut off

如果远程连接tls，则需要配置/etc/pki/CA/cacert.pem

在client机器上escto-bj-hp-z620

 tree --charset ASCII /etc/pki/
/etc/pki/
|-- CA
|   `-- cacert.pem
|-- libvirt
|   |-- clientcert.pem
|   `-- private
|       `-- clientkey.pem
`-- nssdb -> /var/lib/nssdb

在server机器上popsuper1982

# tree --charset ASCII /etc/pki/
/etc/pki/
|-- CA
|   `-- cacert.pem
|-- libvirt
|   |-- private
|   |   `-- serverkey.pem
|   `-- servercert.pem
`-- nssdb -> /var/lib/nssdb

# virsh -c qemu+tls://popsuper1982/system list --all
Please enter your authentication name: test1@popsuper1982
Please enter your password: 
Id    Name                           State
----------------------------------------------------
-     ubuntu-14.04                   shut off

需要用hostname才能通过认证

本文转自银狐博客51CTO博客，原文链接http://blog.51cto.com/foxhound/2051024如需转载请自行联系原作者

战狐

码农公寓

cat certificate_authority_template.info

cat certificate_authority_key.pem

certtool --generate-self-signed --template certificate_authority_template.info --load-privkey certificate_authority_key.pem --outfile certificate_authority_certificate.pem

certtool --generate-self-signed --template certificate_authority_template.info --load-privkey certificate_authority_key.pem --outfile certificate_authority_certificate.pem

cat certificate_authority_certificate.pem

cat popsuper1982_server_template.info

(umask 277 && certtool --generate-privkey > popsuper1982_server_key.pem)

certtool --generate-certificate --template popsuper1982_server_template.info --load-privkey popsuper1982_server_key.pem --load-ca-certificate certificate_authority_certificate.pem --load-ca-privkey certificate_authority_key.pem --outfile popsuper1982_server_certificate.pem

certtool --generate-certificate --template popsuper1982_server_template.info --load-privkey popsuper1982_server_key.pem --load-ca-certificate certificate_authority_certificate.pem --load-ca-privkey certificate_authority_key.pem --outfile popsuper1982_server_certificate.pem

Defaults for libvirt-bin initscript (/etc/init.d/libvirt-bin)

This is a POSIX shell fragment

Start libvirtd to handle qemu/kvm:

options passed to libvirtd, add "-l" to listen on tcp

pass in location of kerberos keytab

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