Nowadays, you do not have to worry too much about installing OpenSSL: most distributions use package management applications. Refer to your distribution documentation, or read the README and INSTALL file inside the OpenSSL tarball. I want also to avoid to make this HOWTO, an installation HOWTO rather than an HOWTO use certificates.
I describe here some standard installation options which are necessary to know for the samples following. Your installation may differ.
The directory for all OpenSSL certificates is /var/ssl/. All commands and paths in this document are issued from this directory, it is not mandatory but it will help the examples.
OpenSSL by default looks for a configuration file in /usr/lib/ssl/openssl.cnf so always add -config /etc/openssl.cnf to the commands openssl ca or openssl req for instance. I use /etc/openssl.cnf so all my configuration files are all in /etc.
Utilities and other libraries are located in /usr/lib/ssl.
Ensure that the utility CA.pl is in an accessible directory such as /usr/sbin. CA.pl can be found inside /usr/lib/ssl directories. CA.pl is a utility that hides the complexity of the openssl command. In all the examples, when I use CA.pl, I will also put the openssl equivalent in brakets.
/usr/sbin/CA.pl needs to be modified to include -config /etc/openssl.cnf in ca and req calls.
#$SSLEAY_CONFIG=$ENV{"SSLEAY_CONFIG"}; $SSLEAY_CONFIG="-config /etc/openssl.cnf"; #$CATOP="./demoCA"; $CATOP="/var/ssl"; |
/etc/openssl.cnf must be configured accordingly to minimize input entry.
#---Begin--- # # OpenSSL example configuration file. # This is mostly being used for generation of certificate requests. # RANDFILE = $ENV::HOME/.rnd oid_file = $ENV::HOME/.oid oid_section = new_oids # To use this configuration file with the "-extfile" option of the # "openssl x509" utility, name here the section containing the # X.509v3 extensions to use: # extensions = # (Alternatively, use a configuration file that has only # X.509v3 extensions in its main [= default] section.) [ new_oids ] # We can add new OIDs in here for use by 'ca' and 'req'. # Add a simple OID like this: # testoid1=1.2.3.4 # Or use config file substitution like this: # testoid2=${testoid1}.5.6 #################################################################### [ ca ] default_ca = CA_default # The default ca section #################################################################### [ CA_default ] dir = /var/ssl # Where everything is kept certs = $dir/certs # Where the issued certs are kept crl_dir = $dir/crl # Where the issued crl are kept database = $dir/index.txt # database index file. new_certs_dir = $dir/newcerts # default place for new certs. certificate = $dir/cacert.pem # The CA certificate serial = $dir/serial # The current serial number crl = $dir/crl.pem # The current CRL private_key = $dir/private/cakey.pem # The private key RANDFILE = $dir/private/.rand # private random number file x509_extensions = usr_cert # The extentions to add to the cert # Extensions to add to a CRL. Note: Netscape communicator chokes on V2 CRLs # so this is commented out by default to leave a V1 CRL. # crl_extensions = crl_ext default_days = 365 # how long to certify for default_crl_days= 7 # how long before next CRL default_md = sha1 # which md to use. preserve = no # keep passed DN ordering # A few difference way of specifying how similar the request should look # For type CA, the listed attributes must be the same, and the optional # and supplied fields are just that :-) policy = policy_match # For the CA policy [ policy_match ] countryName = match stateOrProvinceName = optional localityName = match organizationName = match organizationalUnitName = optional commonName = supplied emailAddress = optional # For the 'anything' policy # At this point in time, you must list all acceptable 'object' # types. [ policy_anything ] countryName = optional stateOrProvinceName = optional localityName = optional organizationName = optional organizationalUnitName = optional commonName = supplied emailAddress = optional #################################################################### [ req ] default_bits = 1024 default_keyfile = privkey.pem distinguished_name = req_distinguished_name attributes = req_attributes default_md = sha1 x509_extensions = v3_ca # The extentions to add to the self signed cert # Passwords for private keys if not present they will be prompted for # input_password = secret # output_password = secret # This sets a mask for permitted string types. There are several options. # default: PrintableString, T61String, BMPString. # pkix : PrintableString, BMPString. # utf8only: only UTF8Strings. # nombstr : PrintableString, T61String (no BMPStrings or UTF8Strings). # MASK:XXXX a literal mask value. # WARNING: current versions of Netscape crash on BMPStrings or UTF8Strings # so use this option with caution! string_mask = nombstr # req_extensions = v3_req # The extensions to add to a certificate request [ req_distinguished_name ] countryName = Country Name (2 letter code) countryName_default = FJ countryName_min = 2 countryName_max = 2 stateOrProvinceName = State or Province Name (full name) stateOrProvinceName_default = Fiji localityName = Locality Name (eg, city) localityName_default = Suva 0.organizationName = Organization Name (eg, company) 0.organizationName_default = SOPAC # we can do this but it is not needed normally :-) #1.organizationName = Second Organization Name (eg, company) #1.organizationName_default = World Wide Web Pty Ltd organizationalUnitName = Organizational Unit Name (eg, section) organizationalUnitName_default = ITU commonName = Common Name (eg, YOUR name) commonName_max = 64 emailAddress = Email Address emailAddress_max = 40 # SET-ex3 = SET extension number 3 [ req_attributes ] challengePassword = A challenge password challengePassword_min = 4 challengePassword_max = 20 unstructuredName = An optional company name [ usr_cert ] # These extensions are added when 'ca' signs a request. # This goes against PKIX guidelines but some CAs do it and some software # requires this to avoid interpreting an end user certificate as a CA. basicConstraints=CA:FALSE # Here are some examples of the usage of nsCertType. If it is omitted # the certificate can be used for anything *except* object signing. # This is OK for an SSL server. # nsCertType = server # For an object signing certificate this would be used. # nsCertType = objsign # For normal client use this is typical # nsCertType = client, email # and for everything including object signing: # nsCertType = client, email, objsign # This is typical in keyUsage for a client certificate. # keyUsage = nonRepudiation, digitalSignature, keyEncipherment # This will be displayed in Netscape's comment listbox. nsComment = "Certificate issued by https://www.sopac.org/ssl/" # PKIX recommendations harmless if included in all certificates. subjectKeyIdentifier=hash authorityKeyIdentifier=keyid,issuer:always # This stuff is for subjectAltName and issuerAltname. # Import the email address. # subjectAltName=email:copy # Copy subject details # issuerAltName=issuer:copy # This is the base URL for all others URL addresses # if not supplied nsBaseUrl = https://www.sopac.org/ssl/ # This is the link where to download the latest Certificate # Revocation List (CRL) nsCaRevocationUrl = https://www.sopac.org/ssl/sopac-ca.crl # This is the link where to revoke the certificate nsRevocationUrl = https://www.sopac.org/ssl/revocation.html? # This is the location where the certificate can be renewed nsRenewalUrl = https://www.sopac.org/ssl/renewal.html? # This is the link where the CA policy can be found nsCaPolicyUrl = https://www.sopac.org/ssl/policy.html # This is the link where we can get the issuer certificate issuerAltName = URI:https://www.sopac.org/ssl/sopac.crt # This is the link where to get the latest CRL crlDistributionPoints = URI:https://www.sopac.org/ssl/sopac-ca.crl [ v3_ca ] # Extensions for a typical CA # PKIX recommendation. subjectKeyIdentifier=hash authorityKeyIdentifier=keyid:always,issuer:always # This is what PKIX recommends but some broken software chokes on critical # extensions. # basicConstraints = critical,CA:true # So we do this instead. basicConstraints = CA:true # Key usage: this is typical for a CA certificate. However since it will # prevent it being used as an test self-signed certificate it is best # left out by default. # keyUsage = cRLSign, keyCertSign # Some might want this also # nsCertType = sslCA, emailCA # Include email address in subject alt name: another PKIX recommendation # subjectAltName=email:copy # Copy issuer details # issuerAltName=issuer:copy # RAW DER hex encoding of an extension: beware experts only! # 1.2.3.5=RAW:02:03 # You can even override a supported extension: # basicConstraints= critical, RAW:30:03:01:01:FF # This will be displayed in Netscape's comment listbox. nsComment = "Certificate issued by https://www.sopac.org/ssl/" # This is the base URL for all others URL addresses # if not supplied nsBaseUrl = https://www.sopac.org/ssl/ # This is the link where to download the latest Certificate # Revocation List (CRL) nsCaRevocationUrl = https://www.sopac.org/ssl/sopac-ca.crl # This is the link where to revoke the certificate nsRevocationUrl = https://www.sopac.org/ssl/revocation.html? # This is the location where the certificate can be renewed nsRenewalUrl = https://www.sopac.org/ssl/renewal.html? # This is the link where the CA policy can be found nsCaPolicyUrl = https://www.sopac.org/ssl/policy.html # This is the link where we can get the issuer certificate issuerAltName = URI:https://www.sopac.org/ssl/sopac.crt # This is the link where to get the latest CRL crlDistributionPoints = URI:https://www.sopac.org/ssl/sopac-ca.crl [ crl_ext ] # CRL extensions. # Only issuerAltName and authorityKeyIdentifier make any sense in a CRL. # issuerAltName=issuer:copy authorityKeyIdentifier=keyid:always,issuer:always #----End---- |
A few comments on openssl.cnf.
Variable names can use the suffixes _default for default value, _min for the minimum number of characters required and _max for the maximum number of characters required.
The file is composed of [Sections] of variables.
Specifies the base directory.
Specifies which section contains the variables for a default certificate.
Defines the usage of the certificate, for instance with CA:TRUE, the certificate is a root CA Certificate.
To create a certification authority, use the command after correctly editing openssl.cnf:
CA.pl -newca |
The utility will ask you to select a certificate file to act as you CA certificate or you are prompted to create one. Follow the steps to create one as exrecise. In the next chapter we will overwrite this default created CA to create a new one with a longer life span. CA.pl creates only 365 days certificates.
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