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ts

NAME

openssl-ts, ts - Time Stamping Authority tool (client/server)

SYNOPSIS

openssl ts -query [-rand file:file...] [-config configfile] [-data file_to_hash] [-digest digest_bytes] [-[digest]] [-tspolicy object_id] [-no_nonce] [-cert] [-in request.tsq] [-out request.tsq] [-text]

openssl ts -reply [-config configfile] [-section tsa_section] [-queryfile request.tsq] [-passin password_src] [-signer tsa_cert.pem] [-inkey file_or_id] [-sha1|-sha224|-sha256|-sha384|-sha512] [-chain certs_file.pem] [-tspolicy object_id] [-in response.tsr] [-token_in] [-out response.tsr] [-token_out] [-text] [-engine id]

openssl ts -verify [-data file_to_hash] [-digest digest_bytes] [-queryfile request.tsq] [-in response.tsr] [-token_in] [-CApath trusted_cert_path] [-CAfile trusted_certs.pem] [-untrusted cert_file.pem] [verify options]

verify options: [-attime timestamp] [-check_ss_sig] [-crl_check] [-crl_check_all] [-explicit_policy] [-extended_crl] [-ignore_critical] [-inhibit_any] [-inhibit_map] [-issuer_checks] [-no_alt_chains] [-no_check_time] [-partial_chain] [-policy arg] [-policy_check] [-policy_print] [-purpose purpose] [-suiteB_128] [-suiteB_128_only] [-suiteB_192] [-trusted_first] [-use_deltas] [-auth_level num] [-verify_depth num] [-verify_email email] [-verify_hostname hostname] [-verify_ip ip] [-verify_name name] [-x509_strict]

DESCRIPTION

The ts command is a basic Time Stamping Authority (TSA) client and server application as specified in RFC 3161 (Time-Stamp Protocol, TSP). A TSA can be part of a PKI deployment and its role is to provide long term proof of the existence of a certain datum before a particular time. Here is a brief description of the protocol:

  1. The TSA client computes a one-way hash value for a data file and sends the hash to the TSA.

  2. The TSA attaches the current date and time to the received hash value, signs them and sends the time stamp token back to the client. By creating this token the TSA certifies the existence of the original data file at the time of response generation.

  3. The TSA client receives the time stamp token and verifies the signature on it. It also checks if the token contains the same hash value that it had sent to the TSA.

There is one DER encoded protocol data unit defined for transporting a time stamp request to the TSA and one for sending the time stamp response back to the client. The ts command has three main functions: creating a time stamp request based on a data file, creating a time stamp response based on a request, verifying if a response corresponds to a particular request or a data file.

There is no support for sending the requests/responses automatically over HTTP or TCP yet as suggested in RFC 3161. The users must send the requests either by ftp or e-mail.

OPTIONS

Time Stamp Request generation

The -query switch can be used for creating and printing a time stamp request with the following options:

-rand file:file...

The files containing random data for seeding the random number generator. Multiple files can be specified, the separator is ; for MS-Windows, , for VMS and : for all other platforms. (Optional)

-config configfile

The configuration file to use. Optional; for a description of the default value, see -data file_to_hash

The data file for which the time stamp request needs to be created. stdin is the default if neither the -data nor the -digest parameter is specified. (Optional)

-digest digest_bytes

It is possible to specify the message imprint explicitly without the data file. The imprint must be specified in a hexadecimal format, two characters per byte, the bytes optionally separated by colons (e.g. 1A:F6:01:... or 1AF601...). The number of bytes must match the message digest algorithm in use. (Optional)

-[digest]

The message digest to apply to the data file. Any digest supported by the OpenSSL dgst command can be used. The default is SHA-1. (Optional)

-tspolicy object_id

The policy that the client expects the TSA to use for creating the time stamp token. Either the dotted OID notation or OID names defined in the config file can be used. If no policy is requested the TSA will use its own default policy. (Optional)

-no_nonce

No nonce is specified in the request if this option is given. Otherwise a 64 bit long pseudo-random none is included in the request. It is recommended to use nonce to protect against replay-attacks. (Optional)

-cert

The TSA is expected to include its signing certificate in the response. (Optional)

-in request.tsq

This option specifies a previously created time stamp request in DER format that will be printed into the output file. Useful when you need to examine the content of a request in human-readable format. (Optional)

-out request.tsq

Name of the output file to which the request will be written. Default is stdout. (Optional)

-text

If this option is specified the output is human-readable text format instead of DER. (Optional)

Time Stamp Response generation

A time stamp response (TimeStampResp) consists of a response status and the time stamp token itself (ContentInfo), if the token generation was successful. The -reply command is for creating a time stamp response or time stamp token based on a request and printing the response/token in human-readable format. If -token_out is not specified the output is always a time stamp response (TimeStampResp), otherwise it is a time stamp token (ContentInfo).

-config configfile

The configuration file to use. Optional; for a description of the default value, see -section tsa_section

The name of the config file section containing the settings for the response generation. If not specified the default TSA section is used, see CONFIGURATION FILE OPTIONS for details. (Optional)

-queryfile request.tsq

The name of the file containing a DER encoded time stamp request. (Optional)

-passin password_src

Specifies the password source for the private key of the TSA. See PASS PHRASE ARGUMENTS in -signer tsa_cert.pem

The signer certificate of the TSA in PEM format. The TSA signing certificate must have exactly one extended key usage assigned to it: timeStamping. The extended key usage must also be critical, otherwise the certificate is going to be refused. Overrides the signer_cert variable of the config file. (Optional)

-inkey file_or_id

The signer private key of the TSA in PEM format. Overrides the signer_key config file option. (Optional) If no engine is used, the argument is taken as a file; if an engine is specified, the argument is given to the engine as a key identifier.

-sha1|-sha224|-sha256|-sha384|-sha512

Signing digest to use. Overrides the signer_digest config file option. (Optional)

-chain certs_file.pem

The collection of certificates in PEM format that will all be included in the response in addition to the signer certificate if the -cert option was used for the request. This file is supposed to contain the certificate chain for the signer certificate from its issuer upwards. The -reply command does not build a certificate chain automatically. (Optional)

-tspolicy object_id

The default policy to use for the response unless the client explicitly requires a particular TSA policy. The OID can be specified either in dotted notation or with its name. Overrides the default_policy config file option. (Optional)

-in response.tsr

Specifies a previously created time stamp response or time stamp token (if -token_in is also specified) in DER format that will be written to the output file. This option does not require a request, it is useful e.g. when you need to examine the content of a response or token or you want to extract the time stamp token from a response. If the input is a token and the output is a time stamp response a default 'granted' status info is added to the token. (Optional)

-token_in

This flag can be used together with the -in option and indicates that the input is a DER encoded time stamp token (ContentInfo) instead of a time stamp response (TimeStampResp). (Optional)

-out response.tsr

The response is written to this file. The format and content of the file depends on other options (see -text, -token_out). The default is stdout. (Optional)

-token_out

The output is a time stamp token (ContentInfo) instead of time stamp response (TimeStampResp). (Optional)

-text

If this option is specified the output is human-readable text format instead of DER. (Optional)

-engine id

Specifying an engine (by its unique id string) will cause ts 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. Default is builtin. (Optional)

Time Stamp Response verification

The -verify command is for verifying if a time stamp response or time stamp token is valid and matches a particular time stamp request or data file. The -verify command does not use the configuration file.

-data file_to_hash

The response or token must be verified against file_to_hash. The file is hashed with the message digest algorithm specified in the token. The -digest and -queryfile options must not be specified with this one. (Optional)

-digest digest_bytes

The response or token must be verified against the message digest specified with this option. The number of bytes must match the message digest algorithm specified in the token. The -data and -queryfile options must not be specified with this one. (Optional)

-queryfile request.tsq

The original time stamp request in DER format. The -data and -digest options must not be specified with this one. (Optional)

-in response.tsr

The time stamp response that needs to be verified in DER format. (Mandatory)

-token_in

This flag can be used together with the -in option and indicates that the input is a DER encoded time stamp token (ContentInfo) instead of a time stamp response (TimeStampResp). (Optional)

-CApath trusted_cert_path

The name of the directory containing the trusted CA certificates of the client. See the similar option of -CAfile trusted_certs.pem

The name of the file containing a set of trusted self-signed CA certificates in PEM format. See the similar option of -untrusted cert_file.pem

Set of additional untrusted certificates in PEM format which may be needed when building the certificate chain for the TSA's signing certificate. This file must contain the TSA signing certificate and all intermediate CA certificates unless the response includes them. (Optional)

verify options

The options -attime timestamp, -check_ss_sig, -crl_check, -crl_check_all, -explicit_policy, -extended_crl, -ignore_critical, -inhibit_any, -inhibit_map, -issuer_checks, -no_alt_chains, -no_check_time, -partial_chain, -policy, -policy_check, -policy_print, -purpose, -suiteB_128, -suiteB_128_only, -suiteB_192, -trusted_first, -use_deltas, -auth_level, -verify_depth, -verify_email, -verify_hostname, -verify_ip, -verify_name, and -x509_strict can be used to control timestamp verification. See CONFIGURATION FILE OPTIONS

The -query and -reply commands make use of a configuration file. See tsa section, default_tsa

This is the main section and it specifies the name of another section that contains all the options for the -reply command. This default section can be overridden with the -section command line switch. (Optional)

oid_file

See oid_section

See RANDFILE

See serial

The name of the file containing the hexadecimal serial number of the last time stamp response created. This number is incremented by 1 for each response. If the file does not exist at the time of response generation a new file is created with serial number 1. (Mandatory)

crypto_device

Specifies the OpenSSL engine that will be set as the default for all available algorithms. The default value is builtin, you can specify any other engines supported by OpenSSL (e.g. use chil for the NCipher HSM). (Optional)

signer_cert

TSA signing certificate in PEM format. The same as the -signer command line option. (Optional)

certs

A file containing a set of PEM encoded certificates that need to be included in the response. The same as the -chain command line option. (Optional)

signer_key

The private key of the TSA in PEM format. The same as the -inkey command line option. (Optional)

signer_digest

Signing digest to use. The same as the -sha1|-sha224|-sha256|-sha384|-sha512 command line option. (Optional)

default_policy

The default policy to use when the request does not mandate any policy. The same as the -tspolicy command line option. (Optional)

other_policies

Comma separated list of policies that are also acceptable by the TSA and used only if the request explicitly specifies one of them. (Optional)

digests

The list of message digest algorithms that the TSA accepts. At least one algorithm must be specified. (Mandatory)

accuracy

The accuracy of the time source of the TSA in seconds, milliseconds and microseconds. E.g. secs:1, millisecs:500, microsecs:100. If any of the components is missing zero is assumed for that field. (Optional)

clock_precision_digits

Specifies the maximum number of digits, which represent the fraction of seconds, that need to be included in the time field. The trailing zeroes must be removed from the time, so there might actually be fewer digits, or no fraction of seconds at all. Supported only on UNIX platforms. The maximum value is 6, default is 0. (Optional)

ordering

If this option is yes the responses generated by this TSA can always be ordered, even if the time difference between two responses is less than the sum of their accuracies. Default is no. (Optional)

tsa_name

Set this option to yes if the subject name of the TSA must be included in the TSA name field of the response. Default is no. (Optional)

ess_cert_id_chain

The SignedData objects created by the TSA always contain the certificate identifier of the signing certificate in a signed attribute (see RFC 2634, Enhanced Security Services). If this option is set to yes and either the certs variable or the -chain option is specified then the certificate identifiers of the chain will also be included in the SigningCertificate signed attribute. If this variable is set to no, only the signing certificate identifier is included. Default is no. (Optional)

EXAMPLES

All the examples below presume that OPENSSL_CONF is set to a proper configuration file, e.g. the example configuration file openssl/apps/openssl.cnf will do.

Time Stamp Request

To create a time stamp request for design1.txt with SHA-1 without nonce and policy and no certificate is required in the response:

openssl ts -query -data design1.txt -no_nonce \
      -out design1.tsq

To create a similar time stamp request with specifying the message imprint explicitly:

openssl ts -query -digest b7e5d3f93198b38379852f2c04e78d73abdd0f4b \
       -no_nonce -out design1.tsq

To print the content of the previous request in human readable format:

openssl ts -query -in design1.tsq -text

To create a time stamp request which includes the MD-5 digest of design2.txt, requests the signer certificate and nonce, specifies a policy id (assuming the tsa_policy1 name is defined in the OID section of the config file):

openssl ts -query -data design2.txt -md5 \
      -tspolicy tsa_policy1 -cert -out design2.tsq

Time Stamp Response

Before generating a response a signing certificate must be created for the TSA that contains the timeStamping critical extended key usage extension without any other key usage extensions. You can add the 'extendedKeyUsage = critical,timeStamping' line to the user certificate section of the config file to generate a proper certificate. See ca(1), Time Stamp Verification

To verify a time stamp reply against a request:

openssl ts -verify -queryfile design1.tsq -in design1.tsr \
      -CAfile cacert.pem -untrusted tsacert.pem

To verify a time stamp reply that includes the certificate chain:

openssl ts -verify -queryfile design2.tsq -in design2.tsr \
      -CAfile cacert.pem

To verify a time stamp token against the original data file: openssl ts -verify -data design2.txt -in design2.tsr \ -CAfile cacert.pem

To verify a time stamp token against a message imprint: openssl ts -verify -digest b7e5d3f93198b38379852f2c04e78d73abdd0f4b \ -in design2.tsr -CAfile cacert.pem

You could also look at the 'test' directory for more examples.

BUGS

If you find any bugs or you have suggestions please write to Zoltan Glozik <zglozik@opentsa.org>. Known issues:

SEE ALSO

openssl(1), x509(1), genrsa(1), COPYRIGHT

Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at https://www.openssl.org/source/license.html.


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