The server also supports restarting interrupted log transfers. To distinguish completed I/O logs from incomplete ones, the I/O log timing file is set to be read-only when the log is complete.
Configuration parameters for sudo_logsrvd may be specified in the sudo_logsrvd.conf5 file.
The options are as follows:
# mkdir /etc/ssl/sudo # cd /etc/ssl/sudo # mkdir certs csr newcerts private # chmod 700 private # touch index.txt # echo 1000 > serial
The serial and index.txt files are used to keep track of signed certificates.
Next, we need to make a copy of the openssl.conf file and customize it for our new CA. The path to openssl.cnf is system-dependent but /etc/ssl/openssl.cnf is the most common location. You will need to adjust the example below if it has a different location on your system.
# cp /etc/ssl/openssl.cnf .
Now edit the openssl.cnf file in the current directory and make sure it contains ``ca'' and ``CA_default'' sections. Those sections should include the following settings:
[ ca ] default_ca = CA_default [ CA_default ] dir = /etc/ssl/sudo certs = $dir/certs database = $dir/index.txt certificate = $dir/cacert.pem serial = $dir/serial
# openssl genrsa -aes256 -out private/cakey.pem 4096 # chmod 400 private/cakey.pem
Next, generate the root certificate, using appropriate values for the site-specific fields:
# openssl req -config openssl.cnf -key private/cakey.pem \ -new -x509 -days 7300 -sha256 -extensions v3_ca \ -out cacert.pem Enter pass phrase for private/cakey.pem: You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank. For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]:US State or Province Name (full name) [Some-State]:Colorado Locality Name (eg, city) : Organization Name (eg, company) [Internet Widgits Pty Ltd]:sudo Organizational Unit Name (eg, section) :sudo Certificate Authority Common Name (e.g., server FQDN or YOUR name) :sudo Root CA Email Address : # chmod 444 cacert.pem
Finally, verify the root certificate:
# openssl x509 -noout -text -in cacert.pem
First, generate the private key without a pass phrase.
# openssl genrsa -out private/logsrvd_key.pem 2048 # chmod 400 private/logsrvd_key.pem
Next, create a certificate signing request (CSR) for the server's certificate. The organization name must match the name given in the root certificate. The common name should be either the server's IP address or a fully qualified domain name.
# openssl req -config openssl.cnf -key private/logsrvd_key.pem -new \ -sha256 -out csr/logsrvd_csr.pem Enter pass phrase for private/logsrvd_key.pem: You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank. For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]:US State or Province Name (full name) [Some-State]:Colorado Locality Name (eg, city) : Organization Name (eg, company) [Internet Widgits Pty Ltd]:sudo Organizational Unit Name (eg, section) :sudo log server Common Name (e.g., server FQDN or YOUR name) :logserver.example.com Email Address : Please enter the following 'extra' attributes to be sent with your certificate request A challenge password : An optional company name :
Now sign the CSR that was just created:
# openssl ca -config openssl.cnf -days 375 -notext -md sha256 \ -in csr/logsrvd_csr.pem -out certs/logsrvd_cert.pem Using configuration from openssl.cnf Enter pass phrase for ./private/cakey.pem: Check that the request matches the signature Signature ok Certificate Details: Serial Number: 4096 (0x1000) Validity Not Before: Nov 11 14:05:05 2019 GMT Not After : Nov 20 14:05:05 2020 GMT Subject: countryName = US stateOrProvinceName = Colorado organizationName = sudo organizationalUnitName = sudo log server commonName = logserve.example.com X509v3 extensions: X509v3 Basic Constraints: CA:FALSE Netscape Comment: OpenSSL Generated Certificate X509v3 Subject Key Identifier: 4C:50:F9:D0:BE:1A:4C:B2:AC:90:76:56:C7:9E:16:AE:E6:9E:E5:B5 X509v3 Authority Key Identifier: keyid:D7:91:24:16:B1:03:06:65:1A:7A:6E:CF:51:E9:5C:CB:7A:95:3E:0C Certificate is to be certified until Nov 20 14:05:05 2020 GMT (375 days) Sign the certificate? [y/n]:y 1 out of 1 certificate requests certified, commit? [y/n]y Write out database with 1 new entries Data Base Updated
Finally, verify the new certificate:
# openssl verify -CAfile cacert.pem certs/logsrvd_cert.pem certs/logsrvd_cert.pem: OK
The /etc/ssl/sudo/certs directory now contains a signed and verified certificate for use with sudo_logsrvd
# If set, secure connections with TLS 1.2 or 1.3. tls = true # Path to the certificate authority bundle file in PEM format. tls_cacert = /etc/ssl/sudo/cacert.pem # Path to the server's certificate file in PEM format. tls_cert = /etc/ssl/sudo/certs/logsrvd_cert.pem # Path to the server's private key file in PEM format. tls_key = /etc/ssl/sudo/private/logsrvd_key.pem
An Todd C. Miller
See the CONTRIBUTORS file in the sudo distribution (https://www.sudo.ws/contributors.html) for an exhaustive list of people who have contributed to sudo