Create a dedicated timestamper which use the openssl cli and custom certificates #2
4
ts-authority/.gitignore
vendored
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4
ts-authority/.gitignore
vendored
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ca/*
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!ca/certs/.gitkeep
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!ca/db/.gitkeep
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!ca/private/.gitkeep
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153
ts-authority/README.md
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153
ts-authority/README.md
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# Set up CA
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## Sources:
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- https://www.jimby.name/techbits/recent/openssl_tsa/
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## Create directory
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```bash
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# mkdir certs db private ## should already be created
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# chmod 700 private ## should already be set
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touch db/index
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openssl rand -hex 16 > db/serial
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echo ‘1001’ > db/crlnumber
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echo 01 > tsa_serial
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```
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## Create files for certificate authority
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Create a new private key and root CA certificate request in one step:
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```bash
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openssl req -new -newkey rsa:2048 -config ./rootca.conf -out ca/root-ca.csr -keyout ca/private/root-ca.key
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```
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Don’t forget the password – you’ll need it again and again below.
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Now self-sign the certificate request.
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```bash
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openssl ca -selfsign -config ./rootca.conf -in ca/root-ca.csr -out ca/root-ca.crt -extensions ca_ext
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```
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Check the certificate:
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```bash
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openssl x509 -text -in ca/root-ca.crt -noout
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```
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## Create certificate for timestamp
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To proceed, we first make a key and a certificate request for a non-CA certificate. We use the -subj option so we don’t
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have to use a configuration file for this step. The Country (C=US) and Organization (O=Example Inc.) elements must
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match the root certificate.
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```bash
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openssl req -new \
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-newkey rsa:2048 \
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-subj "/C=US/O=Example Inc./OU=Engineering/CN=Example Inc. TSA Responder" \
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-keyout ca/private/tsa.key \
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-out ca/tsa.csr
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```
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You should use a different password for the tsa.key private key.
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Then we generate a non-CA certificate using the -extension tsa_ext command line option which points to the required
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extendedKeyUsage in the configuration file.
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```bash
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openssl ca -config ./rootca.conf -in ca/tsa.csr -out ca/tsa.crt -extensions tsa_ext -days 365
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```
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Sign with the root-ca.key private key password, and commit to the database.
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Examine the new TSA certificate as follows:
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```bash
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openssl x509 -in ca/tsa.crt -text -noout
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```
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Ensure that it has CA: false , keyUsage nonRepudiation, and extendedKeyUsage timeStamping.
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Requests to the time stamp service usually require that the reply include the certificate chain of the service. We now create the certificate chain as follows:
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First, extract just the PEM form of the x509 certificates for root-ca.crt and tsa.crt :
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```bash
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openssl x509 -in ca/root-ca.crt -outform PEM -out ca/root-ca.pem
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openssl x509 -in ca/tsa.crt -outform PEM -out ca/tsa.pem
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```
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Next, concatenate the two bare certificates ensuring that the root certificate is last in the file:
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```bash
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cat ca/tsa.pem ca/root-ca.pem > ca/tsa-chain.pem
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```
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You can verify this chain by just viewing the file:
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```bash
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cat ca/tsa-chain.pem
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```
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## Generate a timestamp request
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Ok! We are now ready to create a time stamp request. First, we prepare a query:
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```bash
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openssl ts -query -config ./rootca.conf -cert -data /etc/hosts -out /tmp/request.tsq
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```
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View the request with
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```bash
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openssl ts -query -in /tmp/request.tsq -text
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```
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Note that since we did not request certificate checking (using the -cert option in the request command above), the text
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output of this command shows “Certificate required: no”. Also, note that we did not specify our own configuration
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file in the above example.
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If you want to use a stronger digest algorithm, specify it on the command line (sha512 requested here):
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```bash
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openssl ts -query -config ./rootca.conf -data /etc/hosts -out /tmp/request.tsr -sha512
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```
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## Generating a reply
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We can now process a reply to the the request. Note that the openssl ts -reply sub-command does require a configuration
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file, including the all the tsa sections. In particular, it uses the tsa_policy1(2,3) options we added at the top of the file.
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Here (and everywhere you utilize the services of the tsa.crt certificate), you must enter the password for the tsa
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certificate private key.
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```bash
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openssl ts -reply -config ./rootca.conf -queryfile /tmp/request.tsq -chain ca/tsa-chain.pem -out /tmp/response.tsr
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```
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```bash
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openssl ts -reply -config ./rootca.conf -in /tmp/response.tsr -text
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```
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## Verification
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Openssl can also verify the received timestamp ensuring that the data file or data digest the query was based on still
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applies to the current version of the file.
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```bash
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openssl ts -verify -queryfile /tmp/request.tsq -in /tmp/response.tsr -CAfile ca/root-ca.pem -untrusted ca/tsa.pem
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```
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The OK response ensures that the original signed timestamp is correctly authorized by the root and tsa certificates
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(in PEM format).
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```bash
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openssl ts -verify -data /etc/hosts -in /tmp/response.tsr -CAfile ca/root-ca.pem -untrusted ca/tsa.pem
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```
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168
ts-authority/rootca.conf
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168
ts-authority/rootca.conf
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#
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# rootca.conf
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#
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# See Ristic OpenSSL Cookbook URL above.
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oid_section = new_oids
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[ new_oids ]
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tsa_policy1 = 1.2.3.4.1
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tsa_policy2 = 1.2.3.4.5.6
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tsa_policy3 = 1.2.3.4.5.7
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###### First Part ########
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[default]
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name = root-ca
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domain_suffix = example.com
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aia_url = http://$name.$domain_suffix/$name.crt
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crl_url = http://$name.$domain_suffix/$name.crl
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ocsp_url = http://ocsp.$name.$domain_suffix:9080
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default_ca = ca_default
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name_opt = utf8,esc_ctrl,multiline,lname,align
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[ca_dn]
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countryName = "US"
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organizationName = "Example Inc."
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commonName = "Root CA"
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###### Second Part #######
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[ca_default]
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home = .
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database = $home/ca/db/index
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serial = $home/ca/db/serial
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crlnumber = $home/ca/db/crlnumber
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certificate = $home/ca/$name.crt
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private_key = $home/ca/private/$name.key
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RANDFILE = $home/ca/private/random
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new_certs_dir = $home/ca/certs
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unique_subject = no
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copy_extensions = none
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default_days = 3650
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default_crl_days = 30
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default_md = sha256
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policy = policy_c_o_match
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name = foo@example.com
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[policy_c_o_match]
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countryName = match
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stateOrProvinceName = optional
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organizationName = match
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organizationalUnitName = optional
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commonName = supplied
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emailAddress = optional
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##### Third Part #######
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[req]
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default_bits = 4096
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encrypt_key = yes
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default_md = sha256
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utf8 = yes
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string_mask = utf8only
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prompt = no
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distinguished_name = ca_dn
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req_extensions = ca_ext
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[ca_ext]
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basicConstraints = critical,CA:true
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keyUsage = critical,keyCertSign,cRLSign
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subjectKeyIdentifier = hash
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####### Fourth Part - Extensions ########
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#
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# Value Meaning - see x509v3.cnf(5)
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# -------- ------------------------------
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# serverAuth SSL/TLS web server authentication
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# clientAuth SSL/TLS web client authentication
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# codeSigning code signing
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# emailProtection email protection (S/MIME)
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# timeStamping trusted doc hash timestamping
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# OCSPSigning OCSP Signing
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# ipsecIKE IPsec internet key exchange
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# msCodeInd Microsoft individual code signing (authenticode)
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# msCodeCom Microsoft commercial code signing (authenticode)
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# msCTLSign Microsoft trust list signing
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# msEFS Microsoft encrypted file system (EFS)
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[sub_ca_ext]
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authorityInfoAccess = @issuer_info
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authorityKeyIdentifier = keyid:always
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basicConstraints = critical,CA:true,pathlen:0
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crlDistributionPoints = @crl_info
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keyUsage = critical,keyCertSign,cRLSign
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extendedKeyUsage = clientAuth,serverAuth
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nameConstraints = @name_constraints
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subjectKeyIdentifier = hash
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[crl_info]
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URI.0 = $crl_url
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[issuer_info]
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caIssuers;URI.0 = $aia_url
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OCSP;URI.0 = $ocsp_url
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[name_constraints]
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permitted;DNS.0=example.com
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permitted;DNS.1=example.org
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excluded;IP.0=0.0.0.0/0.0.0.0
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excluded;IP.1=0:0:0:0:0:0:0:0/0:0:0:0:0:0:0:0
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####### Fifth Part ==========
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[ocsp_ext]
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authorityKeyIdentifier = keyid:always
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basicConstraints = critical,CA:false
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extendedKeyUsage = OCSPSigning
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keyUsage = critical,digitalSignature
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subjectKeyIdentifier = hash
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########### TSA extension ##############
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#
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# Copied from the OpenSSL CAtsa.cnf test configuration and modified for use as a TSA extension.
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#
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#
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[ tsa ]
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default_tsa = tsa_config1
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[ tsa_config1 ]
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dir = . # TSA root directory, same as root-ca
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serial = $dir/ca/tsa_serial # current serial number (mandatory)
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signer_cert = $dir/ca/tsa.crt # signing certificate (optional)
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certs = $dir/ca/tsa-chain.pem # certification chain (optional)
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signer_key = $dir/ca/private/tsa.key # tsa private key (optional)
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default_policy = tsa_policy1
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signer_digest = sha256 # digest to use for signing (optional)
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other_policies = tsa_policy2,tsa_policy3 # other policies (optional)
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digests = sha256,sha384,sha512 # acceptable digests (mandatory)
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accuracy = secs:1,millisecs:500,microsecs:100 # accuracy optional
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ordering = yes # is ordering defined? (optional, default: no)
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tsa_name = yes # must tsa name be included in reply? (opt., default: no)
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ess_cert_id_chain = yes # must ess cert id change be incl? (opt., default: no)
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ess_cert_id_alg = sha256 # alg to compute cert. id (optional, default: sha1)
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# added, was missing in the blog post
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crypto_device = builtin
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# The tsa_ext extension is
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# used to create the tsa cert tsa.crt
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[ tsa_ext ]
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authorityKeyIdentifier = keyid:always
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basicConstraints = critical,CA:false
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extendedKeyUsage = critical,timeStamping
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keyUsage = critical,nonRepudiation
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subjectKeyIdentifier = hash
|
||||
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Block a user