certtool(1) User Commands certtool(1)
NAME
certtool - GnuTLS certificate tool
SYNOPSIS
certtool [-flags] [-flag [value]] [--option-name[[=| ]value]] All arguments must be options.
DESCRIPTION
Tool to parse and generate X.509 certificates, requests and private keys. It can be used interactively or non interactively by specifying the template command line option. The tool accepts files or URLs supported by GnuTLS. In case PIN is required for the URL access you can provide it using the environment variables GNUTLS_PIN and GNUTLS_SO_PIN.
OPTIONS
-d number, --debug=number Enable debugging. This option takes an integer number as its argument. The value of number is constrained to being: in the range 0 through 9999 Specifies the debug level. -V, --verbose More verbose output. This option may appear an unlimited number of times. --infile=file Input file. --outfile=string Output file. -s, --generate-self-signed Generate a self-signed certificate. -c, --generate-certificate Generate a signed certificate. --generate-proxy Generates a proxy certificate. --generate-crl Generate a CRL. This option generates a CRL. When combined with --load-crl it would use the loaded CRL as base for the generated (i.e., all revoked certificates in the base will be copied to the new CRL). -u, --update-certificate Update a signed certificate. -p, --generate-privkey Generate a private key. -q, --generate-request Generate a PKCS #10 certificate request. This option must not appear in combination with any of the following options: infile. Will generate a PKCS #10 certificate request. To specify a pri- vate key use --load-privkey. -e, --verify-chain Verify a PEM encoded certificate chain. The last certificate in the chain must be a self signed one. It can be combined with --verify-purpose or --verify-hostname. --verify Verify a PEM encoded certificate chain using a trusted list. The trusted certificate list can be loaded with --load-ca-cer- tificate. If no certificate list is provided, then the system's certificate list is used. Note that during verification multiple paths may be explored. On a successful verification the success- ful path will be the last one. It can be combined with --verify- purpose or --verify-hostname. --verify-crl Verify a CRL using a trusted list. This option must appear in combination with the following options: load-ca-certificate. The trusted certificate list must be loaded with --load-ca-cer- tificate. --verify-hostname=string Specify a hostname to be used for certificate chain verifica- tion. This is to be combined with one of the verify certificate options. --verify-email=string Specify a email to be used for certificate chain verification. This option must not appear in combination with any of the fol- lowing options: verify-hostname. This is to be combined with one of the verify certificate options. --verify-purpose=string Specify a purpose OID to be used for certificate chain verifica- tion. This object identifier restricts the purpose of the certificates to be verified. Example purposes are 1.3.6.1.5.5.7.3.1 (TLS WWW), 1.3.6.1.5.5.7.3.4 (EMAIL) etc. Note that a CA certificate without a purpose set (extended key usage) is valid for any pur- pose. --generate-dh-params Generate PKCS #3 encoded Diffie-Hellman parameters. --get-dh-params Get the included PKCS #3 encoded Diffie-Hellman parameters. Returns stored DH parameters in GnuTLS. Those parameters are used in the SRP protocol. The parameters returned by fresh gen- eration are more efficient since GnuTLS 3.0.9. --dh-info Print information PKCS #3 encoded Diffie-Hellman parameters. --load-privkey=string Loads a private key file. This can be either a file or a PKCS #11 URL --load-pubkey=string Loads a public key file. This can be either a file or a PKCS #11 URL --load-request=string Loads a certificate request file. --load-certificate=string Loads a certificate file. This can be either a file or a PKCS #11 URL --load-ca-privkey=string Loads the certificate authority's private key file. This can be either a file or a PKCS #11 URL --load-ca-certificate=string Loads the certificate authority's certificate file. This can be either a file or a PKCS #11 URL --load-crl=string Loads the provided CRL. --load-data=string Loads auxilary data. --password=string Password to use. You can use this option to specify the password in the command line instead of reading it from the tty. Note, that the command line arguments are available for view in others in the system. Specifying password as '' is the same as specifying no password. --null-password Enforce a NULL password. This option enforces a NULL password. This is different than the empty or no password in schemas like PKCS #8. --empty-password Enforce an empty password. This option enforces an empty password. This is different than the NULL or no password in schemas like PKCS #8. --hex-numbers Print big number in an easier format to parse. --cprint In certain operations it prints the information in C-friendly format. In certain operations it prints the information in C-friendly format, suitable for including into C programs. -i, --certificate-info Print information on the given certificate. --fingerprint Print the fingerprint of the given certificate. This is a simple hash of the DER encoding of the certificate. It can be combined with the --hash parameter. However, it is recom- mended for identification to use the key-id which depends only on the certificate's key. --key-id Print the key ID of the given certificate. This is a hash of the public key of the given certificate. It identifies the key uniquely, remains the same on a certificate renewal and depends only on signed fields of the certificate. --certificate-pubkey Print certificate's public key. --pgp-certificate-info Print information on the given OpenPGP certificate. --pgp-ring-info Print information on the given OpenPGP keyring structure. -l, --crl-info Print information on the given CRL structure. --crq-info Print information on the given certificate request. --no-crq-extensions Do not use extensions in certificate requests. --p12-info Print information on a PKCS #12 structure. This option will dump the contents and print the metadata of the provided PKCS #12 structure. --p12-name=string The PKCS #12 friendly name to use. The name to be used for the primary certificate and private key in a PKCS #12 file. --p7-generate Generate a PKCS #7 structure. This option generates a PKCS #7 certificate container structure. To add certificates in the structure use --load-certificate and --load-crl. --p7-sign Signs using a PKCS #7 structure. This option generates a PKCS #7 structure containing a signature for the provided data. The data are stored within the structure. The signer certificate has to be specified using --load-certifi- cate and --load-privkey. --p7-detached-sign Signs using a detached PKCS #7 structure. This option generates a PKCS #7 structure containing a signature for the provided data. The signer certificate has to be speci- fied using --load-certificate and --load-privkey. --p7-include-cert, - Fl -no-p7-include-cert The signer's certificate will be included in the cert list.. The no-p7-include-cert form will disable the option. This option is enabled by default. This options works with --p7-sign or --p7-detached-sign and will include or exclude the signer's certificate into the generated signature. --p7-time Will include a timestamp in the PKCS #7 structure. This option will include a timestamp in the generated signature --p7-show-data, - Fl -no-p7-show-data Will show the embedded data in the PKCS #7 structure. The no-p7-show-data form will disable the option. This option can be combined with --p7-verify and will display the embedded signed data in the PKCS #7 structure. --p7-info Print information on a PKCS #7 structure. --p7-verify Verify the provided PKCS #7 structure. This option verifies the signed PKCS #7 structure. The certifi- cate list to use for verification can be specified with --load- ca-certificate. When no certificate list is provided, then the system's certificate list is used. Alternatively a direct signer can be provided using --load-certificate. A key purpose can be enforced with the --verify-purpose option, and the --load-data option will utilize detached data. --p8-info Print information on a PKCS #8 structure. This option will print information about encrypted PKCS #8 structures. That option does not require the decryption of the structure. --smime-to-p7 Convert S/MIME to PKCS #7 structure. -k, --key-info Print information on a private key. --pgp-key-info Print information on an OpenPGP private key. --pubkey-info Print information on a public key. The option combined with --load-request, --load-pubkey, --load- privkey and --load-certificate will extract the public key of the object in question. --v1 Generate an X.509 version 1 certificate (with no extensions). --to-p12 Generate a PKCS #12 structure. This option must appear in com- bination with the following options: load-certificate. It requires a certificate, a private key and possibly a CA cer- tificate to be specified. --to-p8 Generate a PKCS #8 structure. -8, --pkcs8 Use PKCS #8 format for private keys. --rsa Generate RSA key. When combined with --generate-privkey generates an RSA private key. --dsa Generate DSA key. When combined with --generate-privkey generates a DSA private key. --ecc Generate ECC (ECDSA) key. When combined with --generate-privkey generates an elliptic curve private key to be used with ECDSA. --ecdsa This is an alias for the --ecc option. --hash=string Hash algorithm to use for signing. Available hash functions are SHA1, RMD160, SHA256, SHA384, SHA512. --inder, - Fl -no-inder Use DER format for input certificates, private keys, and DH parameters . The no-inder form will disable the option. The input files will be assumed to be in DER or RAW format. Unlike options that in PEM input would allow multiple input data (e.g. multiple certificates), when reading in DER format a sin- gle data structure is read. --inraw This is an alias for the --inder option. --outder, - Fl -no-outder Use DER format for output certificates, private keys, and DH parameters. The no-outder form will disable the option. The output will be in DER or RAW format. --outraw This is an alias for the --outder option. --bits=number Specify the number of bits for key generate. This option takes an integer number as its argument. --curve=string Specify the curve used for EC key generation. Supported values are secp192r1, secp224r1, secp256r1, secp384r1 and secp521r1. --sec-param=security parameter Specify the security level [low, legacy, medium, high, ultra]. This is alternative to the bits option. --disable-quick-random No effect. --template=string Template file to use for non-interactive operation. --stdout-info Print information to stdout instead of stderr. --ask-pass Enable interaction for entering password when in batch mode.. This option will enable interaction to enter password when in batch mode. That is useful when the template option has been specified. --pkcs-cipher=cipher Cipher to use for PKCS #8 and #12 operations. Cipher may be one of 3des, 3des-pkcs12, aes-128, aes-192, aes-256, rc2-40, arcfour. --provider=string Specify the PKCS #11 provider library. This will override the default options in /etc/gnutls/pkcs11.conf -h, --help Display usage information and exit. -!, --more-help Pass the extended usage information through a pager. -v [{v|c|n --version [{v|c|n}]}] Output version of program and exit. The default mode is `v', a simple version. The `c' mode will print copyright information and `n' will print the full copyright notice.
FILES
Certtool's template file format A template file can be used to avoid the interactive questions of cert- tool. Initially create a file named 'cert.cfg' that contains the infor- mation about the certificate. The template can be used as below: $ certtool --generate-certificate --load-privkey key.pem --template cert.cfg --outfile cert.pem --load-ca-certificate ca-cert.pem --load-ca-privkey ca-key.pem An example certtool template file that can be used to generate a cer- tificate request or a self signed certificate follows. # X.509 Certificate options # # DN options # The organization of the subject. organization = "Koko inc." # The organizational unit of the subject. unit = "sleeping dept." # The locality of the subject. # locality = # The state of the certificate owner. state = "Attiki" # The country of the subject. Two letter code. country = GR # The common name of the certificate owner. cn = "Cindy Lauper" # A user id of the certificate owner. #uid = "clauper" # Set domain components #dc = "name" #dc = "domain" # If the supported DN OIDs are not adequate you can set # any OID here. # For example set the X.520 Title and the X.520 Pseudonym # by using OID and string pairs. #dn_oid = 2.5.4.12 Dr. #dn_oid = 2.5.4.65 jackal # This is deprecated and should not be used in new # certificates. # pkcs9_email = "none@none.org" # An alternative way to set the certificate's distinguished name directly # is with the "dn" option. The attribute names allowed are: # C (country), street, O (organization), OU (unit), title, CN (common name), # L (locality), ST (state), placeOfBirth, gender, countryOfCitizenship, # countryOfResidence, serialNumber, telephoneNumber, surName, initials, # generationQualifier, givenName, pseudonym, dnQualifier, postalCode, name, # businessCategory, DC, UID, jurisdictionOfIncorporationLocalityName, # jurisdictionOfIncorporationStateOrProvinceName, # jurisdictionOfIncorporationCountryName, XmppAddr, and numeric OIDs. #dn = "cn = Nikos,st = New Something,C=GR,surName=Mavrogiannopoulos,2.5.4.9=Arkadias" # The serial number of the certificate # Comment the field for a time-based serial number. serial = 007 # In how many days, counting from today, this certificate will expire. # Use -1 if there is no expiration date. expiration_days = 700 # Alternatively you may set concrete dates and time. The GNU date string # formats are accepted. See: # http://www.gnu.org/software/tar/manual/html_node/Date-input-formats.html #activation_date = "2004-02-29 16:21:42" #expiration_date = "2025-02-29 16:24:41" # X.509 v3 extensions # A dnsname in case of a WWW server. #dns_name = "www.none.org" #dns_name = "www.morethanone.org" # A subject alternative name URI #uri = "http://www.example.com" # An IP address in case of a server. #ip_address = "192.168.1.1" # An email in case of a person email = "none@none.org" # Challenge password used in certificate requests challenge_password = 123456 # Password when encrypting a private key #password = secret # An URL that has CRLs (certificate revocation lists) # available. Needed in CA certificates. #crl_dist_points = "http://www.getcrl.crl/getcrl/" # Whether this is a CA certificate or not #ca # Subject Unique ID (in hex) #subject_unique_id = 00153224 # Issuer Unique ID (in hex) #issuer_unique_id = 00153225 #### Key usage # The following key usage flags are used by CAs and end certificates # Whether this certificate will be used to sign data (needed # in TLS DHE ciphersuites). This is the digitalSignature flag # in RFC5280 terminology. signing_key # Whether this certificate will be used to encrypt data (needed # in TLS RSA ciphersuites). Note that it is preferred to use different # keys for encryption and signing. This is the keyEncipherment flag # in RFC5280 terminology. encryption_key # Whether this key will be used to sign other certificates. The # keyCertSign flag in RFC5280 terminology. #cert_signing_key # Whether this key will be used to sign CRLs. The # cRLSign flag in RFC5280 terminology. #crl_signing_key # The keyAgreement flag of RFC5280. It's purpose is loosely # defined. Not use it unless required by a protocol. #key_agreement # The dataEncipherment flag of RFC5280. It's purpose is loosely # defined. Not use it unless required by a protocol. #data_encipherment # The nonRepudiation flag of RFC5280. It's purpose is loosely # defined. Not use it unless required by a protocol. #non_repudiation #### Extended key usage (key purposes) # The following extensions are used in an end certificate # to clarify its purpose. Some CAs also use it to indicate # the types of certificates they are purposed to sign. # Whether this certificate will be used for a TLS client; # this sets the id-kp-serverAuth (1.3.6.1.5.5.7.3.1) of # extended key usage. #tls_www_client # Whether this certificate will be used for a TLS server; # This sets the id-kp-clientAuth (1.3.6.1.5.5.7.3.2) of # extended key usage. #tls_www_server # Whether this key will be used to sign code. This sets the # id-kp-codeSigning (1.3.6.1.5.5.7.3.3) of extended key usage # extension. #code_signing_key # Whether this key will be used to sign OCSP data. This sets the # id-kp-OCSPSigning (1.3.6.1.5.5.7.3.9) of extended key usage extension. #ocsp_signing_key # Whether this key will be used for time stamping. This sets the # id-kp-timeStamping (1.3.6.1.5.5.7.3.8) of extended key usage extension. #time_stamping_key # Whether this key will be used for email protection. This sets the # id-kp-emailProtection (1.3.6.1.5.5.7.3.4) of extended key usage extension. #email_protection_key # Whether this key will be used for IPsec IKE operations (1.3.6.1.5.5.7.3.17). #ipsec_ike_key ## adding custom key purpose OIDs # for microsoft smart card logon # key_purpose_oid = 1.3.6.1.4.1.311.20.2.2 # for email protection # key_purpose_oid = 1.3.6.1.5.5.7.3.4 # for any purpose (must not be used in intermediate CA certificates) # key_purpose_oid = 2.5.29.37.0 ### end of key purpose OIDs # When generating a certificate from a certificate # request, then honor the extensions stored in the request # and store them in the real certificate. #honor_crq_extensions # Path length contraint. Sets the maximum number of # certificates that can be used to certify this certificate. # (i.e. the certificate chain length) #path_len = -1 #path_len = 2 # OCSP URI # ocsp_uri = http://my.ocsp.server/ocsp # CA issuers URI # ca_issuers_uri = http://my.ca.issuer # Certificate policies #policy1 = 1.3.6.1.4.1.5484.1.10.99.1.0 #policy1_txt = "This is a long policy to summarize" #policy1_url = http://www.example.com/a-policy-to-read #policy2 = 1.3.6.1.4.1.5484.1.10.99.1.1 #policy2_txt = "This is a short policy" #policy2_url = http://www.example.com/another-policy-to-read # Name constraints # DNS #nc_permit_dns = example.com #nc_exclude_dns = test.example.com # EMAIL #nc_permit_email = "nmav@ex.net" # Exclude subdomains of example.com #nc_exclude_email = .example.com # Exclude all e-mail addresses of example.com #nc_exclude_email = example.com # Options for proxy certificates #proxy_policy_language = 1.3.6.1.5.5.7.21.1 # Options for generating a CRL # The number of days the next CRL update will be due. # next CRL update will be in 43 days #crl_next_update = 43 # this is the 5th CRL by this CA # Comment the field for a time-based number. #crl_number = 5 # Specify the update dates more precisely. #crl_this_update_date = "2004-02-29 16:21:42" #crl_next_update_date = "2025-02-29 16:24:41" # The date that the certificates will be made seen as # being revoked. #crl_revocation_date = "2025-02-29 16:24:41"
EXAMPLES
Generating private keys To create an RSA private key, run: $ certtool --generate-privkey --outfile key.pem --rsa To create a DSA or elliptic curves (ECDSA) private key use the above command combined with 'dsa' or 'ecc' options. Generating certificate requests To create a certificate request (needed when the certificate is issued by another party), run: certtool --generate-request --load-privkey key.pem --outfile request.pem If the private key is stored in a smart card you can generate a request by specifying the private key object URL. $ ./certtool --generate-request --load-privkey "pkcs11:..." --load-pubkey "pkcs11:..." --outfile request.pem Generating a self-signed certificate To create a self signed certificate, use the command: $ certtool --generate-privkey --outfile ca-key.pem $ certtool --generate-self-signed --load-privkey ca-key.pem --outfile ca-cert.pem Note that a self-signed certificate usually belongs to a certificate authority, that signs other certificates. Generating a certificate To generate a certificate using the previous request, use the command: $ certtool --generate-certificate --load-request request.pem --outfile cert.pem --load-ca-certificate ca-cert.pem --load-ca-privkey ca-key.pem To generate a certificate using the private key only, use the command: $ certtool --generate-certificate --load-privkey key.pem --outfile cert.pem --load-ca-certificate ca-cert.pem --load-ca-privkey ca-key.pem Certificate information To view the certificate information, use: $ certtool --certificate-info --infile cert.pem PKCS #12 structure generation To generate a PKCS #12 structure using the previous key and certifi- cate, use the command: $ certtool --load-certificate cert.pem --load-privkey key.pem --to-p12 --outder --outfile key.p12 Some tools (reportedly web browsers) have problems with that file because it does not contain the CA certificate for the certificate. To work around that problem in the tool, you can use the --load-ca-cer- tificate parameter as follows: $ certtool --load-ca-certificate ca.pem --load-certificate cert.pem --load-privkey key.pem --to-p12 --outder --outfile key.p12 Diffie-Hellman parameter generation To generate parameters for Diffie-Hellman key exchange, use the com- mand: $ certtool --generate-dh-params --outfile dh.pem --sec-param medium Proxy certificate generation Proxy certificate can be used to delegate your credential to a tempo- rary, typically short-lived, certificate. To create one from the pre- viously created certificate, first create a temporary key and then gen- erate a proxy certificate for it, using the commands: $ certtool --generate-privkey > proxy-key.pem $ certtool --generate-proxy --load-ca-privkey key.pem --load-privkey proxy-key.pem --load-certificate cert.pem --outfile proxy-cert.pem Certificate revocation list generation To create an empty Certificate Revocation List (CRL) do: $ certtool --generate-crl --load-ca-privkey x509-ca-key.pem --load-ca-certificate x509-ca.pem To create a CRL that contains some revoked certificates, place the cer- tificates in a file and use --load-certificate as follows: $ certtool --generate-crl --load-ca-privkey x509-ca-key.pem --load-ca-certificate x509-ca.pem --load-certificate revoked-certs.pem To verify a Certificate Revocation List (CRL) do: $ certtool --verify-crl --load-ca-certificate x509-ca.pem < crl.pem
EXIT STATUS
One of the following exit values will be returned: 0 (EXIT_SUCCESS) Successful program execution. 1 (EXIT_FAILURE) The operation failed or the command syntax was not valid. 70 (EX_SOFTWARE) libopts had an internal operational error. Please report it to autogen-users@lists.sourceforge.net. Thank you.
SEE ALSO
p11tool (1)
AUTHORS
Nikos Mavrogiannopoulos, Simon Josefsson and others; see /usr/share/doc/gnutls/AUTHORS for a complete list.
COPYRIGHT
Copyright (C) 2000-2016 Free Software Foundation, and others all rights reserved. This program is released under the terms of the GNU General Public License, version 3 or later.
BUGS
Please send bug reports to: bugs@gnutls.org
NOTES
This manual page was AutoGen-erated from the certtool option defini- tions. 3.4.11 11 Apr 2016 certtool(1)
gnutls 3.4.11 - Generated Thu Apr 21 20:39:34 CDT 2016