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CA(1)                                        OpenSSL                                        CA(1)



NAME
       ca - sample minimal CA application

SYNOPSIS
       openssl ca [-verbose] [-config filename] [-name section] [-gencrl] [-revoke file] [-status
       serial] [-updatedb] [-crl_reason reason] [-crl_hold instruction] [-crl_compromise time]
       [-crl_CA_compromise time] [-crldays days] [-crlhours hours] [-crlexts section] [-startdate
       date] [-enddate date] [-days arg] [-md arg] [-policy arg] [-keyfile arg] [-keyform
       PEM|DER] [-key arg] [-passin arg] [-cert file] [-selfsign] [-in file] [-out file]
       [-notext] [-outdir dir] [-infiles] [-spkac file] [-ss_cert file] [-preserveDN]
       [-noemailDN] [-batch] [-msie_hack] [-extensions section] [-extfile section] [-engine id]
       [-subj arg] [-utf8] [-multivalue-rdn]

DESCRIPTION
       The ca command is a minimal CA application. It can be used to sign certificate requests in
       a variety of forms and generate CRLs it also maintains a text database of issued
       certificates and their status.

       The options descriptions will be divided into each purpose.

CA OPTIONS
       -config filename
           specifies the configuration file to use.

       -name section
           specifies the configuration file section to use (overrides default_ca in the ca
           section).

       -in filename
           an input filename containing a single certificate request to be signed by the CA.

       -ss_cert filename
           a single self signed certificate to be signed by the CA.

       -spkac filename
           a file containing a single Netscape signed public key and challenge and additional
           field values to be signed by the CA. See the SPKAC FORMAT section for information on
           the required input and output format.

       -infiles
           if present this should be the last option, all subsequent arguments are assumed to the
           the names of files containing certificate requests.

       -out filename
           the output file to output certificates to. The default is standard output. The
           certificate details will also be printed out to this file in PEM format (except that
           -spkac outputs DER format).

       -outdir directory
           the directory to output certificates to. The certificate will be written to a filename
           consisting of the serial number in hex with ".pem" appended.

       -cert
           the CA certificate file.

       -keyfile filename
           the private key to sign requests with.

       -keyform PEM|DER
           the format of the data in the private key file.  The default is PEM.

       -key password
           the password used to encrypt the private key. Since on some systems the command line
           arguments are visible (e.g. Unix with the 'ps' utility) this option should be used
           with caution.

       -selfsign
           indicates the issued certificates are to be signed with the key the certificate
           requests were signed with (given with -keyfile).  Cerificate requests signed with a
           different key are ignored.  If -spkac, -ss_cert or -gencrl are given, -selfsign is
           ignored.

           A consequence of using -selfsign is that the self-signed certificate appears among the
           entries in the certificate database (see the configuration option database), and uses
           the same serial number counter as all other certificates sign with the self-signed
           certificate.

       -passin arg
           the key password source. For more information about the format of arg see the PASS
           PHRASE ARGUMENTS section in openssl(1).

       -verbose
           this prints extra details about the operations being performed.

       -notext
           don't output the text form of a certificate to the output file.

       -startdate date
           this allows the start date to be explicitly set. The format of the date is
           YYMMDDHHMMSSZ (the same as an ASN1 UTCTime structure).

       -enddate date
           this allows the expiry date to be explicitly set. The format of the date is
           YYMMDDHHMMSSZ (the same as an ASN1 UTCTime structure).

       -days arg
           the number of days to certify the certificate for.

       -md alg
           the message digest to use. Possible values include md5, sha1 and mdc2.  For full list
           of digests see openssl dgst -h output. This option also applies to CRLs.

       -policy arg
           this option defines the CA "policy" to use. This is a section in the configuration
           file which decides which fields should be mandatory or match the CA certificate. Check
           out the POLICY FORMAT section for more information.

       -msie_hack
           this is a legacy option to make ca work with very old versions of the IE certificate
           enrollment control "certenr3". It used UniversalStrings for almost everything. Since
           the old control has various security bugs its use is strongly discouraged. The newer
           control "Xenroll" does not need this option.

       -preserveDN
           Normally the DN order of a certificate is the same as the order of the fields in the
           relevant policy section. When this option is set the order is the same as the request.
           This is largely for compatibility with the older IE enrollment control which would
           only accept certificates if their DNs match the order of the request. This is not
           needed for Xenroll.

       -noemailDN
           The DN of a certificate can contain the EMAIL field if present in the request DN,
           however it is good policy just having the e-mail set into the altName extension of the
           certificate. When this option is set the EMAIL field is removed from the certificate'
           subject and set only in the, eventually present, extensions. The email_in_dn keyword
           can be used in the configuration file to enable this behaviour.

       -batch
           this sets the batch mode. In this mode no questions will be asked and all certificates
           will be certified automatically.

       -extensions section
           the section of the configuration file containing certificate extensions to be added
           when a certificate is issued (defaults to x509_extensions unless the -extfile option
           is used). If no extension section is present then, a V1 certificate is created. If the
           extension section is present (even if it is empty), then a V3 certificate is created.
           See the:w x509v3_config(5) manual page for details of the extension section format.

       -extfile file
           an additional configuration file to read certificate extensions from (using the
           default section unless the -extensions option is also used).

       -engine id
           specifying an engine (by its unique id string) will cause ca to attempt to obtain a
           functional reference to the specified engine, thus initialising it if needed. The
           engine will then be set as the default for all available algorithms.

       -subj arg
           supersedes subject name given in the request.  The arg must be formatted as
           /type0=value0/type1=value1/type2=..., characters may be escaped by \ (backslash), no
           spaces are skipped.

       -utf8
           this option causes field values to be interpreted as UTF8 strings, by default they are
           interpreted as ASCII. This means that the field values, whether prompted from a
           terminal or obtained from a configuration file, must be valid UTF8 strings.

       -multivalue-rdn
           this option causes the -subj argument to be interpretedt with full support for
           multivalued RDNs. Example:

           /DC=org/DC=OpenSSL/DC=users/UID=123456+CN=John Doe

           If -multi-rdn is not used then the UID value is 123456+CN=John Doe.

CRL OPTIONS
       -gencrl
           this option generates a CRL based on information in the index file.

       -crldays num
           the number of days before the next CRL is due. That is the days from now to place in
           the CRL nextUpdate field.

       -crlhours num
           the number of hours before the next CRL is due.

       -revoke filename
           a filename containing a certificate to revoke.

       -status serial
           displays the revocation status of the certificate with the specified serial number and
           exits.

       -updatedb
           Updates the database index to purge expired certificates.

       -crl_reason reason
           revocation reason, where reason is one of: unspecified, keyCompromise, CACompromise,
           affiliationChanged, superseded, cessationOfOperation, certificateHold or
           removeFromCRL. The matching of reason is case insensitive. Setting any revocation
           reason will make the CRL v2.

           In practive removeFromCRL is not particularly useful because it is only used in delta
           CRLs which are not currently implemented.

       -crl_hold instruction
           This sets the CRL revocation reason code to certificateHold and the hold instruction
           to instruction which must be an OID. Although any OID can be used only
           holdInstructionNone (the use of which is discouraged by RFC2459)
           holdInstructionCallIssuer or holdInstructionReject will normally be used.

       -crl_compromise time
           This sets the revocation reason to keyCompromise and the compromise time to time. time
           should be in GeneralizedTime format that is YYYYMMDDHHMMSSZ.

       -crl_CA_compromise time
           This is the same as crl_compromise except the revocation reason is set to
           CACompromise.

       -crlexts section
           the section of the configuration file containing CRL extensions to include. If no CRL
           extension section is present then a V1 CRL is created, if the CRL extension section is
           present (even if it is empty) then a V2 CRL is created. The CRL extensions specified
           are CRL extensions and not CRL entry extensions.  It should be noted that some
           software (for example Netscape) can't handle V2 CRLs. See x509v3_config(5) manual page
           for details of the extension section format.

CONFIGURATION FILE OPTIONS
       The section of the configuration file containing options for ca is found as follows: If
       the -name command line option is used, then it names the section to be used. Otherwise the
       section to be used must be named in the default_ca option of the ca section of the
       configuration file (or in the default section of the configuration file). Besides
       default_ca, the following options are read directly from the ca section:
        RANDFILE  preserve
        msie_hack With the exception of RANDFILE, this is probably a bug and may change in future
       releases.

       Many of the configuration file options are identical to command line options. Where the
       option is present in the configuration file and the command line the command line value is
       used. Where an option is described as mandatory then it must be present in the
       configuration file or the command line equivalent (if any) used.

       oid_file
           This specifies a file containing additional OBJECT IDENTIFIERS.  Each line of the file
           should consist of the numerical form of the object identifier followed by white space
           then the short name followed by white space and finally the long name.

       oid_section
           This specifies a section in the configuration file containing extra object
           identifiers. Each line should consist of the short name of the object identifier
           followed by = and the numerical form. The short and long names are the same when this
           option is used.

       new_certs_dir
           the same as the -outdir command line option. It specifies the directory where new
           certificates will be placed. Mandatory.

       certificate
           the same as -cert. It gives the file containing the CA certificate. Mandatory.

       private_key
           same as the -keyfile option. The file containing the CA private key. Mandatory.

       RANDFILE
           a file used to read and write random number seed information, or an EGD socket (see
           RAND_egd(3)).

       default_days
           the same as the -days option. The number of days to certify a certificate for.

       default_startdate
           the same as the -startdate option. The start date to certify a certificate for. If not
           set the current time is used.

       default_enddate
           the same as the -enddate option. Either this option or default_days (or the command
           line equivalents) must be present.

       default_crl_hours default_crl_days
           the same as the -crlhours and the -crldays options. These will only be used if neither
           command line option is present. At least one of these must be present to generate a
           CRL.

       default_md
           the same as the -md option. The message digest to use. Mandatory.

       database
           the text database file to use. Mandatory. This file must be present though initially
           it will be empty.

       unique_subject
           if the value yes is given, the valid certificate entries in the database must have
           unique subjects.  if the value no is given, several valid certificate entries may have
           the exact same subject.  The default value is yes, to be compatible with older (pre
           0.9.8) versions of OpenSSL.  However, to make CA certificate roll-over easier, it's
           recommended to use the value no, especially if combined with the -selfsign command
           line option.

       serial
           a text file containing the next serial number to use in hex. Mandatory.  This file
           must be present and contain a valid serial number.

       crlnumber
           a text file containing the next CRL number to use in hex. The crl number will be
           inserted in the CRLs only if this file exists. If this file is present, it must
           contain a valid CRL number.

       x509_extensions
           the same as -extensions.

       crl_extensions
           the same as -crlexts.

       preserve
           the same as -preserveDN

       email_in_dn
           the same as -noemailDN. If you want the EMAIL field to be removed from the DN of the
           certificate simply set this to 'no'. If not present the default is to allow for the
           EMAIL filed in the certificate's DN.

       msie_hack
           the same as -msie_hack

       policy
           the same as -policy. Mandatory. See the POLICY FORMAT section for more information.

       name_opt, cert_opt
           these options allow the format used to display the certificate details when asking the
           user to confirm signing. All the options supported by the x509 utilities -nameopt and
           -certopt switches can be used here, except the no_signame and no_sigdump are
           permanently set and cannot be disabled (this is because the certificate signature
           cannot be displayed because the certificate has not been signed at this point).

           For convenience the values ca_default are accepted by both to produce a reasonable
           output.

           If neither option is present the format used in earlier versions of OpenSSL is used.
           Use of the old format is strongly discouraged because it only displays fields
           mentioned in the policy section, mishandles multicharacter string types and does not
           display extensions.

       copy_extensions
           determines how extensions in certificate requests should be handled.  If set to none
           or this option is not present then extensions are ignored and not copied to the
           certificate. If set to copy then any extensions present in the request that are not
           already present are copied to the certificate. If set to copyall then all extensions
           in the request are copied to the certificate: if the extension is already present in
           the certificate it is deleted first. See the WARNINGS section before using this
           option.

           The main use of this option is to allow a certificate request to supply values for
           certain extensions such as subjectAltName.

POLICY FORMAT
       The policy section consists of a set of variables corresponding to certificate DN fields.
       If the value is "match" then the field value must match the same field in the CA
       certificate. If the value is "supplied" then it must be present. If the value is
       "optional" then it may be present. Any fields not mentioned in the policy section are
       silently deleted, unless the -preserveDN option is set but this can be regarded more of a
       quirk than intended behaviour.

SPKAC FORMAT
       The input to the -spkac command line option is a Netscape signed public key and challenge.
       This will usually come from the KEYGEN tag in an HTML form to create a new private key.
       It is however possible to create SPKACs using the spkac utility.

       The file should contain the variable SPKAC set to the value of the SPKAC and also the
       required DN components as name value pairs.  If you need to include the same component
       twice then it can be preceded by a number and a '.'.

       When processing SPKAC format, the output is DER if the -out flag is used, but PEM format
       if sending to stdout or the -outdir flag is used.

EXAMPLES
       Note: these examples assume that the ca directory structure is already set up and the
       relevant files already exist. This usually involves creating a CA certificate and private
       key with req, a serial number file and an empty index file and placing them in the
       relevant directories.

       To use the sample configuration file below the directories demoCA, demoCA/private and
       demoCA/newcerts would be created. The CA certificate would be copied to demoCA/cacert.pem
       and its private key to demoCA/private/cakey.pem. A file demoCA/serial would be created
       containing for example "01" and the empty index file demoCA/index.txt.

       Sign a certificate request:

        openssl ca -in req.pem -out newcert.pem

       Sign a certificate request, using CA extensions:

        openssl ca -in req.pem -extensions v3_ca -out newcert.pem

       Generate a CRL

        openssl ca -gencrl -out crl.pem

       Sign several requests:

        openssl ca -infiles req1.pem req2.pem req3.pem

       Certify a Netscape SPKAC:

        openssl ca -spkac spkac.txt

       A sample SPKAC file (the SPKAC line has been truncated for clarity):

        SPKAC=MIG0MGAwXDANBgkqhkiG9w0BAQEFAANLADBIAkEAn7PDhCeV/xIxUg8V70YRxK2A5
        CN=Steve Test
        emailAddress=steve AT openssl.org
        0.OU=OpenSSL Group
        1.OU=Another Group

       A sample configuration file with the relevant sections for ca:

        [ ca ]
        default_ca      = CA_default            # The default ca section

        [ CA_default ]

        dir            = ./demoCA              # top dir
        database       = $dir/index.txt        # index file.
        new_certs_dir  = $dir/newcerts         # new certs dir

        certificate    = $dir/cacert.pem       # The CA cert
        serial         = $dir/serial           # serial no file
        private_key    = $dir/private/cakey.pem# CA private key
        RANDFILE       = $dir/private/.rand    # random number file

        default_days   = 365                   # how long to certify for
        default_crl_days= 30                   # how long before next CRL
        default_md     = md5                   # md to use

        policy         = policy_any            # default policy
        email_in_dn    = no                    # Don't add the email into cert DN

        name_opt       = ca_default            # Subject name display option
        cert_opt       = ca_default            # Certificate display option
        copy_extensions = none                 # Don't copy extensions from request

        [ policy_any ]
        countryName            = supplied
        stateOrProvinceName    = optional
        organizationName       = optional
        organizationalUnitName = optional
        commonName             = supplied
        emailAddress           = optional

FILES
       Note: the location of all files can change either by compile time options, configuration
       file entries, environment variables or command line options.  The values below reflect the
       default values.

        /usr/local/ssl/lib/openssl.cnf - master configuration file
        ./demoCA                       - main CA directory
        ./demoCA/cacert.pem            - CA certificate
        ./demoCA/private/cakey.pem     - CA private key
        ./demoCA/serial                - CA serial number file
        ./demoCA/serial.old            - CA serial number backup file
        ./demoCA/index.txt             - CA text database file
        ./demoCA/index.txt.old         - CA text database backup file
        ./demoCA/certs                 - certificate output file
        ./demoCA/.rnd                  - CA random seed information

ENVIRONMENT VARIABLES
       OPENSSL_CONF reflects the location of master configuration file it can be overridden by
       the -config command line option.

RESTRICTIONS
       The text database index file is a critical part of the process and if corrupted it can be
       difficult to fix. It is theoretically possible to rebuild the index file from all the
       issued certificates and a current CRL: however there is no option to do this.

       V2 CRL features like delta CRLs are not currently supported.

       Although several requests can be input and handled at once it is only possible to include
       one SPKAC or self signed certificate.

BUGS
       The use of an in memory text database can cause problems when large numbers of
       certificates are present because, as the name implies the database has to be kept in
       memory.

       The ca command really needs rewriting or the required functionality exposed at either a
       command or interface level so a more friendly utility (perl script or GUI) can handle
       things properly. The scripts CA.sh and CA.pl help a little but not very much.

       Any fields in a request that are not present in a policy are silently deleted. This does
       not happen if the -preserveDN option is used. To enforce the absence of the EMAIL field
       within the DN, as suggested by RFCs, regardless the contents of the request' subject the
       -noemailDN option can be used. The behaviour should be more friendly and configurable.

       Cancelling some commands by refusing to certify a certificate can create an empty file.

WARNINGS
       The ca command is quirky and at times downright unfriendly.

       The ca utility was originally meant as an example of how to do things in a CA. It was not
       supposed to be used as a full blown CA itself: nevertheless some people are using it for
       this purpose.

       The ca command is effectively a single user command: no locking is done on the various
       files and attempts to run more than one ca command on the same database can have
       unpredictable results.

       The copy_extensions option should be used with caution. If care is not taken then it can
       be a security risk. For example if a certificate request contains a basicConstraints
       extension with CA:TRUE and the copy_extensions value is set to copyall and the user does
       not spot this when the certificate is displayed then this will hand the requestor a valid
       CA certificate.

       This situation can be avoided by setting copy_extensions to copy and including
       basicConstraints with CA:FALSE in the configuration file.  Then if the request contains a
       basicConstraints extension it will be ignored.

       It is advisable to also include values for other extensions such as keyUsage to prevent a
       request supplying its own values.

       Additional restrictions can be placed on the CA certificate itself.  For example if the CA
       certificate has:

        basicConstraints = CA:TRUE, pathlen:0

       then even if a certificate is issued with CA:TRUE it will not be valid.

SEE ALSO
       req(1), spkac(1), x509(1), CA.pl(1), config(5), x509v3_config(5)



1.0.2k                                      2017-08-04                                      CA(1)

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