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RFC 3161 compliant time stamp request creation, response generation

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and response verification.

Submitted by: Zoltan Glozik <zglozik@opentsa.org>
Reviewed by: Ulf Moeller
This commit is contained in:
Ulf Möller
2006-02-12 23:11:56 +00:00
parent 1c17d91c53
commit c7235be6e3
47 changed files with 7523 additions and 127 deletions
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=pod
=head1 NAME
ts - Time Stamping Authority tool (client/server)
=head1 SYNOPSIS
B<openssl> B<ts>
B<-query>
[B<-rand> file:file...]
[B<-config> configfile]
[B<-data> file_to_hash]
[B<-digest> digest_bytes]
[B<-md2>|B<-md4>|B<-md5>|B<-sha>|B<-sha1>|B<-mdc2>|B<-ripemd160>]
[B<-policy> object_id]
[B<-no_nonce>]
[B<-cert>]
[B<-in> request.tsq]
[B<-out> request.tsq]
[B<-text>]
B<openssl> B<ts>
B<-reply>
[B<-config> configfile]
[B<-section> tsa_section]
[B<-queryfile> request.tsq]
[B<-passin> password_src]
[B<-signer> tsa_cert.pem]
[B<-inkey> private.pem]
[B<-chain> certs_file.pem]
[B<-policy> object_id]
[B<-in> response.tsr]
[B<-token_in>]
[B<-out> response.tsr]
[B<-token_out>]
[B<-text>]
[B<-engine> id]
B<openssl> B<ts>
B<-verify>
[B<-data> file_to_hash]
[B<-digest> digest_bytes]
[B<-queryfile> request.tsq]
[B<-in> response.tsr]
[B<-token_in>]
[B<-CApath> trusted_cert_path]
[B<-CAfile> trusted_certs.pem]
[B<-untrusted> cert_file.pem]
=head1 DESCRIPTION
The B<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:
=over 4
=item 1.
The TSA client computes a one-way hash value for a data file and sends
the hash to the TSA.
=item 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.
=item 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.
=back
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 B<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.
=head1 OPTIONS
=head2 Time Stamp Request generation
The B<-query> switch can be used for creating and printing a time stamp
request with the following options:
=over 4
=item B<-rand> file:file...
The files containing random data for seeding the random number
generator. Multiple files can be specified, the separator is B<;> for
MS-Windows, B<,> for VMS and B<:> for all other platforms. (Optional)
=item B<-config> configfile
The configuration file to use, this option overrides the
B<OPENSSL_CONF> environment variable. Only the OID section
of the config file is used with the B<-query> command. (Optional)
=item B<-data> file_to_hash
The data file for which the time stamp request needs to be
created. stdin is the default if neither the B<-data> nor the B<-digest>
parameter is specified. (Optional)
=item B<-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)
=item B<-md2>|B<-md4>|B<-md5>|B<-sha>|B<-sha1>|B<-mdc2>|B<-ripemd160>
The message digest to apply to the data file. The default is SHA-1. (Optional)
=item B<-policy> 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)
=item B<-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)
=item B<-cert>
The TSA is expected to include its signing certificate in the
response. (Optional)
=item B<-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)
=item B<-out> request.tsq
Name of the output file to which the request will be written. Default
is stdout. (Optional)
=item B<-text>
If this option is specified the output is human-readable text format
instead of DER. (Optional)
=back
=head2 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 B<-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 B<-token_out> is not
specified the output is always a time stamp response (TimeStampResp),
otherwise it is a time stamp token (ContentInfo).
=over 4
=item B<-config> configfile
The configuration file to use, this option overrides the
B<OPENSSL_CONF> environment variable. See B<CONFIGURATION FILE
OPTIONS> for configurable variables. (Optional)
=item B<-section> tsa_section
The name of the config file section conatining the settings for the
response generation. If not specified the default TSA section is
used, see B<CONFIGURATION FILE OPTIONS> for details. (Optional)
=item B<-queryfile> request.tsq
The name of the file containing a DER encoded time stamp request. (Optional)
=item B<-passin> password_src
Specifies the password source for the private key of the TSA. See
B<PASS PHRASE ARGUMENTS> in L<openssl(1)|openssl(1)>. (Optional)
=item B<-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 B<signer_cert>
variable of the config file. (Optional)
=item B<-inkey> private.pem
The signer private key of the TSA in PEM format. Overrides the
B<signer_key> config file option. (Optional)
=item B<-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 B<-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 B<-reply> command does not build a certificate
chain automatically. (Optional)
=item B<-policy> 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
B<default_policy> config file option. (Optional)
=item B<-in> response.tsr
Specifies a previously created time stamp response or time stamp token
(if B<-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)
=item B<-token_in>
This flag can be used together with the B<-in> option and indicates
that the input is a DER encoded time stamp token (ContentInfo) instead
of a time stamp response (TimeStampResp). (Optional)
=item B<-out> response.tsr
The response is written to this file. The format and content of the
file depends on other options (see B<-text>, B<-token_out>). The default is
stdout. (Optional)
=item B<-token_out>
The output is a time stamp token (ContentInfo) instead of time stamp
response (TimeStampResp). (Optional)
=item B<-text>
If this option is specified the output is human-readable text format
instead of DER. (Optional)
=item B<-engine> id
Specifying an engine (by it's unique B<id> string) will cause B<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)
=back
=head2 Time Stamp Response verification
The B<-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 B<-verify> command does not use the configuration file.
=over 4
=item B<-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 B<-digest> and B<-queryfile> options must not be specified with this one.
(Optional)
=item B<-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 B<-data> and B<-queryfile> options must not be
specified with this one. (Optional)
=item B<-queryfile> request.tsq
The original time stamp request in DER format. The B<-data> and B<-digest>
options must not be specified with this one. (Optional)
=item B<-in> response.tsr
The time stamp response that needs to be verified in DER format. (Mandatory)
=item B<-token_in>
This flag can be used together with the B<-in> option and indicates
that the input is a DER encoded time stamp token (ContentInfo) instead
of a time stamp response (TimeStampResp). (Optional)
=item B<-CApath> trusted_cert_path
The name of the directory containing the trused CA certificates of the
client. See the similar option of L<verify(1)|verify(1)> for additional
details. Either this option or B<-CAfile> must be specified. (Optional)
=item B<-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
L<verify(1)|verify(1)> for additional details. Either this option
or B<-CApath> must be specified.
(Optional)
=item B<-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)
=back
=head1 CONFIGURATION FILE OPTIONS
The B<-query> and B<-reply> commands make use of a configuration file
defined by the B<OPENSSL_CONF> environment variable. See L<config(5)|config(5>
for a general description of the syntax of the config file. The
B<-query> command uses only the symbolic OID names section
and it can work without it. However, the B<-reply> command needs the
config file for its operation.
When there is a command line switch equivalent of a variable the
switch always overrides the settings in the config file.
=over 4
=item B<tsa> section, B<default_tsa>
This is the main section and it specifies the name of another section
that contains all the options for the B<-reply> command. This default
section can be overriden with the B<-section> command line switch. (Optional)
=item B<oid_file>
See L<ca(1)|ca(1)> for description. (Optional)
=item B<oid_section>
See L<ca(1)|ca(1)> for description. (Optional)
=item B<RANDFILE>
See L<ca(1)|ca(1)> for description. (Optional)
=item B<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 exit at the time of response
generation a new file is created with serial number 1. (Mandatory)
=item B<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)
=item B<signer_cert>
TSA signing certificate in PEM format. The same as the B<-signer>
command line option. (Optional)
=item B<certs>
A file containing a set of PEM encoded certificates that need to be
included in the response. The same as the B<-chain> command line
option. (Optional)
=item B<signer_key>
The private key of the TSA in PEM format. The same as the B<-inkey>
command line option. (Optional)
=item B<default_policy>
The default policy to use when the request does not mandate any
policy. The same as the B<-policy> command line option. (Optional)
=item B<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)
=item B<digests>
The list of message digest algorithms that the TSA accepts. At least
one algorithm must be specified. (Mandatory)
=item B<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)
=item B<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)
=item B<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)
=item B<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)
=item B<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 B<certs> variable or the B<-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)
=back
=head1 ENVIRONMENT VARIABLES
B<OPENSSL_CONF> contains the path of the configuration file and can be
overriden by the B<-config> command line option.
=head1 EXAMPLES
All the examples below presume that B<OPENSSL_CONF> is set to a proper
configuration file, e.g. the example configuration file
openssl/apps/openssl.cnf will do.
=head2 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 \
-policy tsa_policy1 -cert -out design2.tsq
=head2 Time Stamp Response
Before generating a response a signing certificate must be created for
the TSA that contains the B<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 L<req(1)|req(1)>,
L<ca(1)|ca(1)>, L<x509(1)|x509(1)> for instructions. The examples
below assume that cacert.pem contains the certificate of the CA,
tsacert.pem is the signing certificate issued by cacert.pem and
tsakey.pem is the private key of the TSA.
To create a time stamp response for a request:
openssl ts -reply -queryfile design1.tsq -inkey tsakey.pem \
-signer tsacert.pem -out design1.tsr
If you want to use the settings in the config file you could just write:
openssl ts -reply -queryfile design1.tsq -out design1.tsr
To print a time stamp reply to stdout in human readable format:
openssl ts -reply -in design1.tsr -text
To create a time stamp token instead of time stamp response:
openssl ts -reply -queryfile design1.tsq -out design1_token.der -token_out
To print a time stamp token to stdout in human readable format:
openssl ts -reply -in design1_token.der -token_in -text -token_out
To extract the time stamp token from a response:
openssl ts -reply -in design1.tsr -out design1_token.der -token_out
To add 'granted' status info to a time stamp token thereby creating a
valid response:
openssl ts -reply -in design1_token.der -token_in -out design1.tsr
=head2 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.
=head1 BUGS
If you find any bugs or you have suggestions please write to
Zoltan Glozik <zglozik@opentsa.org>. Known issues:
=over 4
=item * No support for time stamps over SMTP, though it is quite easy
to implement an automatic e-mail based TSA with L<procmail(1)|procmail(1)>
and L<perl(1)|perl(1)>. HTTP server support is provided in the form of
a separate apache module. HTTP client support is provided by
L<tsget(1)|tsget(1)>. Pure TCP/IP protocol is not supported.
=item * The file containing the last serial number of the TSA is not
locked when being read or written. This is a problem if more than one
instance of L<openssl(1)|openssl(1)> is trying to create a time stamp
response at the same time. This is not an issue when using the apache
server module, it does proper locking.
=item * Look for the FIXME word in the source files.
=item * The source code should really be reviewed by somebody else, too.
=item * More testing is needed, I have done only some basic tests (see
test/testtsa).
=back
=cut
=head1 AUTHOR
Zoltan Glozik <zglozik@opentsa.org>, OpenTSA project (http://www.opentsa.org)
=head1 SEE ALSO
L<tsget(1)|tsget(1)>, L<openssl(1)|openssl(1)>, L<req(1)|req(1)>,
L<x509(1)|x509(1)>, L<ca(1)|ca(1)>, L<genrsa(1)|genrsa(1)>,
L<config(5)|config(5)>
=cut

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=pod
=head1 NAME
tsget - Time Stamping HTTP/HTTPS client
=head1 SYNOPSIS
B<tsget>
B<-h> server_url
[B<-e> extension]
[B<-o> output]
[B<-v>]
[B<-d>]
[B<-k> private_key.pem]
[B<-p> key_password]
[B<-c> client_cert.pem]
[B<-C> CA_certs.pem]
[B<-P> CA_path]
[B<-r> file:file...]
[B<-g> EGD_socket]
[request]...
=head1 DESCRIPTION
The B<tsget> command can be used for sending a time stamp request, as
specified in B<RFC 3161>, to a time stamp server over HTTP or HTTPS and storing
the time stamp response in a file. This tool cannot be used for creating the
requests and verifying responses, you can use the OpenSSL B<ts(1)> command to
do that. B<tsget> can send several requests to the server without closing
the TCP connection if more than one requests are specified on the command
line.
The tool sends the following HTTP request for each time stamp request:
POST url HTTP/1.1
User-Agent: OpenTSA tsget.pl/<version>
Host: <host>:<port>
Pragma: no-cache
Content-Type: application/timestamp-query
Accept: application/timestamp-reply
Content-Length: length of body
...binary request specified by the user...
B<tsget> expects a response of type application/timestamp-reply, which is
written to a file without any interpretation.
=head1 OPTIONS
=over 4
=item B<-h> server_url
The URL of the HTTP/HTTPS server listening for time stamp requests.
=item B<-e> extension
If the B<-o> option is not given this argument specifies the extension of the
output files. The base name of the output file will be the same as those of
the input files. Default extension is '.tsr'. (Optional)
=item B<-o> output
This option can be specified only when just one request is sent to the
server. The time stamp response will be written to the given output file. '-'
means standard output. In case of multiple time stamp requests or the absence
of this argument the names of the output files will be derived from the names
of the input files and the default or specified extension argument. (Optional)
=item B<-v>
The name of the currently processed request is printed on standard
error. (Optional)
=item B<-d>
Switches on verbose mode for the underlying B<curl> library. You can see
detailed debug messages for the connection. (Optional)
=item B<-k> private_key.pem
(HTTPS) In case of certificate-based client authentication over HTTPS
<private_key.pem> must contain the private key of the user. The private key
file can optionally be protected by a passphrase. The B<-c> option must also
be specified. (Optional)
=item B<-p> key_password
(HTTPS) Specifies the passphrase for the private key specified by the B<-k>
argument. If this option is omitted and the key is passphrase protected B<tsget>
will ask for it. (Optional)
=item B<-c> client_cert.pem
(HTTPS) In case of certificate-based client authentication over HTTPS
<client_cert.pem> must contain the X.509 certificate of the user. The B<-k>
option must also be specified. If this option is not specified no
certificate-based client authentication will take place. (Optional)
=item B<-C> CA_certs.pem
(HTTPS) The trusted CA certificate store. The certificate chain of the peer's
certificate must include one of the CA certificates specified in this file.
Either option B<-C> or option B<-P> must be given in case of HTTPS. (Optional)
=item B<-P> CA_path
(HTTPS) The path containing the trusted CA certificates to verify the peer's
certificate. The directory must be prepared with the B<c_rehash>
OpenSSL utility. Either option B<-C> or option B<-P> must be given in case of
HTTPS. (Optional)
=item B<-rand> file:file...
The files containing random data for seeding the random number
generator. Multiple files can be specified, the separator is B<;> for
MS-Windows, B<,> for VMS and B<:> for all other platforms. (Optional)
=item B<-g> EGD_socket
The name of an EGD socket to get random data from. (Optional)
=item [request]...
List of files containing B<RFC 3161> DER-encoded time stamp requests. If no
requests are specifed only one request will be sent to the server and it will be
read from the standard input. (Optional)
=back
=head1 ENVIRONMENT VARIABLES
The B<TSGET> environment variable can optionally contain default
arguments. The content of this variable is added to the list of command line
arguments.
=head1 EXAMPLES
The examples below presume that B<file1.tsq> and B<file2.tsq> contain valid
time stamp requests, tsa.opentsa.org listens at port 8080 for HTTP requests
and at port 8443 for HTTPS requests, the TSA service is available at the /tsa
absolute path.
Get a time stamp response for file1.tsq over HTTP, output is written to
file1.tsr:
tsget -h http://tsa.opentsa.org:8080/tsa file1.tsq
Get a time stamp response for file1.tsq and file2.tsq over HTTP showing
progress, output is written to file1.reply and file2.reply respectively:
tsget -h http://tsa.opentsa.org:8080/tsa -v -e .reply \
file1.tsq file2.tsq
Create a time stamp request, write it to file3.tsq, send it to the server and
write the response to file3.tsr:
openssl ts -query -data file3.txt -cert | tee file3.tsq \
| tsget -h http://tsa.opentsa.org:8080/tsa \
-o file3.tsr
Get a time stamp response for file1.tsq over HTTPS without client
authentication:
tsget -h https://tsa.opentsa.org:8443/tsa \
-C cacerts.pem file1.tsq
Get a time stamp response for file1.tsq over HTTPS with certificate-based
client authentication (it will ask for the passphrase if client_key.pem is
protected):
tsget -h https://tsa.opentsa.org:8443/tsa -C cacerts.pem \
-k client_key.pem -c client_cert.pem file1.tsq
You can shorten the previous command line if you make use of the B<TSGET>
environment variable. The following commands do the same as the previous
example:
TSGET='-h https://tsa.opentsa.org:8443/tsa -C cacerts.pem \
-k client_key.pem -c client_cert.pem'
export TSGET
tsget file1.tsq
=head1 AUTHOR
Zoltan Glozik <zglozik@opentsa.org>, OpenTSA project (http://www.opentsa.org)
=head1 SEE ALSO
L<openssl(1)|openssl(1)>, L<ts(1)|ts(1)>, L<curl(1)|curl(1)>,
B<RFC 3161>
=cut

4
doc/standards.txt
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@@ -69,6 +69,10 @@ PKCS#12: Personal Information Exchange Syntax Standard, version 1.0.
3174 US Secure Hash Algorithm 1 (SHA1). D. Eastlake 3rd, P. Jones.
September 2001. (Format: TXT=35525 bytes) (Status: INFORMATIONAL)
3161 Internet X.509 Public Key Infrastructure, Time-Stamp Protocol (TSP)
C. Adams, P. Cain, D. Pinkas, R. Zuccherato. August 2001
(Status: PROPOSED STANDARD)
3268 Advanced Encryption Standard (AES) Ciphersuites for Transport
Layer Security (TLS). P. Chown. June 2002. (Format: TXT=13530 bytes)
(Status: PROPOSED STANDARD)