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Documents </>
Manual pages "User Commands (1)" </>
S_SERVER(1) |
OpenSSL |
S_SERVER(1) |
openssl-s_server, s_server - SSL/TLS server program
openssl s_server [-help] [-port +int]
[-accept val] [-unix val] [-4] [-6]
[-unlink] [-context val] [-verify int] [-Verify
int] [-cert infile] [-nameopt val] [-naccept +int]
[-serverinfo val] [-certform PEM|DER] [-key infile]
[-keyform format] [-pass val] [-dcert infile]
[-dcertform PEM|DER] [-dkey infile] [-dkeyform PEM|DER]
[-dpass val] [-nbio_test] [-crlf] [-debug]
[-msg] [-msgfile outfile] [-state] [-CAfile
infile] [-CApath dir] [-no-CAfile] [-no-CApath]
[-nocert] [-quiet] [-no_resume_ephemeral] [-www]
[-WWW] [-servername] [-servername_fatal] [-cert2
infile] [-key2 infile] [-tlsextdebug] [-HTTP]
[-id_prefix val] [-rand file...] [-writerand file]
[-keymatexport val] [-keymatexportlen +int] [-CRL
infile] [-crl_download] [-cert_chain infile]
[-dcert_chain infile] [-chainCApath dir] [-verifyCApath
dir] [-no_cache] [-ext_cache] [-CRLform PEM|DER]
[-verify_return_error] [-verify_quiet] [-build_chain]
[-chainCAfile infile] [-verifyCAfile infile] [-ign_eof]
[-no_ign_eof] [-status] [-status_verbose]
[-status_timeout int] [-status_url val] [-status_file
infile] [-trace] [-security_debug]
[-security_debug_verbose] [-brief] [-rev]
[-async] [-ssl_config val] [-max_send_frag +int]
[-split_send_frag +int] [-max_pipelines +int] [-read_buf
+int] [-no_ssl3] [-no_tls1] [-no_tls1_1]
[-no_tls1_2] [-no_tls1_3] [-bugs] [-no_comp]
[-comp] [-no_ticket] [-num_tickets]
[-serverpref] [-legacy_renegotiation]
[-no_renegotiation] [-legacy_server_connect]
[-no_resumption_on_reneg] [-no_legacy_server_connect]
[-allow_no_dhe_kex] [-prioritize_chacha] [-strict]
[-sigalgs val] [-client_sigalgs val] [-groups val]
[-curves val] [-named_curve val] [-cipher val]
[-ciphersuites val] [-dhparam infile] [-record_padding
val] [-debug_broken_protocol] [-policy val] [-purpose
val] [-verify_name val] [-verify_depth int]
[-auth_level int] [-attime intmax] [-verify_hostname
val] [-verify_email val] [-verify_ip]
[-ignore_critical] [-issuer_checks] [-crl_check]
[-crl_check_all] [-policy_check] [-explicit_policy]
[-inhibit_any] [-inhibit_map] [-x509_strict]
[-extended_crl] [-use_deltas] [-policy_print]
[-check_ss_sig] [-trusted_first] [-suiteB_128_only]
[-suiteB_128] [-suiteB_192] [-partial_chain]
[-no_alt_chains] [-no_check_time] [-allow_proxy_certs]
[-xkey] [-xcert] [-xchain] [-xchain_build]
[-xcertform PEM|DER] [-xkeyform PEM|DER] [-nbio]
[-psk_identity val] [-psk_hint val] [-psk val]
[-psk_session file] [-srpvfile infile] [-srpuserseed
val] [-ssl3] [-tls1] [-tls1_1] [-tls1_2]
[-tls1_3] [-dtls] [-timeout] [-mtu +int]
[-listen] [-dtls1] [-dtls1_2] [-sctp]
[-sctp_label_bug] [-no_dhe] [-nextprotoneg val]
[-use_srtp val] [-alpn val] [-engine val]
[-keylogfile outfile] [-max_early_data int]
[-early_data] [-anti_replay] [-no_anti_replay]
The s_server command implements a generic SSL/TLS server
which listens for connections on a given port using SSL/TLS.
In addition to the options below the s_server utility also
supports the common and server only options documented in the
"Supported Command Line Commands" section of the
SSL_CONF_cmd(3) manual page.
- -help
- Print out a usage message.
- -port +int
- The TCP port to listen on for connections. If not specified 4433 is
used.
- -accept
val
- The optional TCP host and port to listen on for connections. If not
specified, *:4433 is used.
- -unix val
- Unix domain socket to accept on.
- -4
- Use IPv4 only.
- -6
- Use IPv6 only.
- -unlink
- For -unix, unlink any existing socket first.
- -context
val
- Sets the SSL context id. It can be given any string value. If this option
is not present a default value will be used.
- -verify int,
-Verify int
- The verify depth to use. This specifies the maximum length of the client
certificate chain and makes the server request a certificate from the
client. With the -verify option a certificate is requested but the
client does not have to send one, with the -Verify option the
client must supply a certificate or an error occurs.
If the cipher suite cannot request a client certificate (for
example an anonymous cipher suite or PSK) this option has no effect.
- -cert infile
- The certificate to use, most servers cipher suites require the use of a
certificate and some require a certificate with a certain public key type:
for example the DSS cipher suites require a certificate containing a DSS
(DSA) key. If not specified then the filename "server.pem" will
be used.
- -cert_chain
- A file containing trusted certificates to use when attempting to build the
client/server certificate chain related to the certificate specified via
the -cert option.
- -build_chain
- Specify whether the application should build the certificate chain to be
provided to the client.
- -nameopt
val
- Option which determines how the subject or issuer names are displayed. The
val argument can be a single option or multiple options separated
by commas. Alternatively the -nameopt switch may be used more than
once to set multiple options. See the x509(1) manual page for
details.
- -naccept
+int
- The server will exit after receiving the specified number of connections,
default unlimited.
- -serverinfo
val
- A file containing one or more blocks of PEM data. Each PEM block must
encode a TLS ServerHello extension (2 bytes type, 2 bytes length, followed
by "length" bytes of extension data). If the client sends an
empty TLS ClientHello extension matching the type, the corresponding
ServerHello extension will be returned.
- -certform
PEM|DER
- The certificate format to use: DER or PEM. PEM is the default.
- -key infile
- The private key to use. If not specified then the certificate file will be
used.
- -keyform
format
- The private format to use: DER or PEM. PEM is the default.
- -pass val
- The private key password source. For more information about the format of
val see "Pass Phrase Options" in openssl(1).
- -dcert infile,
-dkey infile
- Specify an additional certificate and private key, these behave in the
same manner as the -cert and -key options except there is no
default if they are not specified (no additional certificate and key is
used). As noted above some cipher suites require a certificate containing
a key of a certain type. Some cipher suites need a certificate carrying an
RSA key and some a DSS (DSA) key. By using RSA and DSS certificates and
keys a server can support clients which only support RSA or DSS cipher
suites by using an appropriate certificate.
- -dcert_chain
- A file containing trusted certificates to use when attempting to build the
server certificate chain when a certificate specified via the
-dcert option is in use.
- -dcertform
PEM|DER, -dkeyform PEM|DER, -dpass val
- Additional certificate and private key format and passphrase
respectively.
- -xkey infile, -xcert
infile, -xchain
- Specify an extra certificate, private key and certificate chain. These
behave in the same manner as the -cert, -key and
-cert_chain options. When specified, the callback returning the
first valid chain will be in use by the server.
- -xchain_build
- Specify whether the application should build the certificate chain to be
provided to the client for the extra certificates provided via -xkey
infile, -xcert infile, -xchain options.
- -xcertform
PEM|DER, -xkeyform PEM|DER
- Extra certificate and private key format respectively.
- -nbio_test
- Tests non blocking I/O.
- -crlf
- This option translated a line feed from the terminal into CR+LF.
- -debug
- Print extensive debugging information including a hex dump of all
traffic.
- -msg
- Show all protocol messages with hex dump.
- -msgfile
outfile
- File to send output of -msg or -trace to, default standard
output.
- -state
- Prints the SSL session states.
- -CAfile
infile
- A file containing trusted certificates to use during client authentication
and to use when attempting to build the server certificate chain. The list
is also used in the list of acceptable client CAs passed to the client
when a certificate is requested.
- -CApath
dir
- The directory to use for client certificate verification. This directory
must be in "hash format", see verify(1) for more
information. These are also used when building the server certificate
chain.
- -chainCApath
dir
- The directory to use for building the chain provided to the client. This
directory must be in "hash format", see verify(1) for
more information.
- -chainCAfile
file
- A file containing trusted certificates to use when attempting to build the
server certificate chain.
- -no-CAfile
- Do not load the trusted CA certificates from the default file
location.
- -no-CApath
- Do not load the trusted CA certificates from the default directory
location.
- -nocert
- If this option is set then no certificate is used. This restricts the
cipher suites available to the anonymous ones (currently just anonymous
DH).
- -quiet
- Inhibit printing of session and certificate information.
- -www
- Sends a status message back to the client when it connects. This includes
information about the ciphers used and various session parameters. The
output is in HTML format so this option will normally be used with a web
browser. Cannot be used in conjunction with -early_data.
- -WWW
- Emulates a simple web server. Pages will be resolved relative to the
current directory, for example if the URL https://myhost/page.html is
requested the file ./page.html will be loaded. Cannot be used in
conjunction with -early_data.
- -tlsextdebug
- Print a hex dump of any TLS extensions received from the server.
- -HTTP
- Emulates a simple web server. Pages will be resolved relative to the
current directory, for example if the URL https://myhost/page.html is
requested the file ./page.html will be loaded. The files loaded are
assumed to contain a complete and correct HTTP response (lines that are
part of the HTTP response line and headers must end with CRLF). Cannot be
used in conjunction with -early_data.
- -id_prefix
val
- Generate SSL/TLS session IDs prefixed by val. This is mostly useful
for testing any SSL/TLS code (e.g. proxies) that wish to deal with
multiple servers, when each of which might be generating a unique range of
session IDs (e.g. with a certain prefix).
- -rand file...
- A file or files containing random data used to seed the random number
generator. Multiple files can be specified separated by an OS-dependent
character. The separator is ; for MS-Windows, , for OpenVMS,
and : for all others.
- [-writerand file]
- Writes random data to the specified file upon exit. This can be
used with a subsequent -rand flag.
- -verify_return_error
- Verification errors normally just print a message but allow the connection
to continue, for debugging purposes. If this option is used, then
verification errors close the connection.
- -status
- Enables certificate status request support (aka OCSP stapling).
- -status_verbose
- Enables certificate status request support (aka OCSP stapling) and gives a
verbose printout of the OCSP response.
- -status_timeout
int
- Sets the timeout for OCSP response to int seconds.
- -status_url
val
- Sets a fallback responder URL to use if no responder URL is present in the
server certificate. Without this option an error is returned if the server
certificate does not contain a responder address.
- -status_file
infile
- Overrides any OCSP responder URLs from the certificate and always provides
the OCSP Response stored in the file. The file must be in DER format.
- -trace
- Show verbose trace output of protocol messages. OpenSSL needs to be
compiled with enable-ssl-trace for this option to work.
- -brief
- Provide a brief summary of connection parameters instead of the normal
verbose output.
- -rev
- Simple test server which just reverses the text received from the client
and sends it back to the server. Also sets -brief. Cannot be used
in conjunction with -early_data.
- -async
- Switch on asynchronous mode. Cryptographic operations will be performed
asynchronously. This will only have an effect if an asynchronous capable
engine is also used via the -engine option. For test purposes the
dummy async engine (dasync) can be used (if available).
- -max_send_frag
+int
- The maximum size of data fragment to send. See
SSL_CTX_set_max_send_fragment(3) for further information.
- -split_send_frag
+int
- The size used to split data for encrypt pipelines. If more data is written
in one go than this value then it will be split into multiple pipelines,
up to the maximum number of pipelines defined by max_pipelines. This only
has an effect if a suitable cipher suite has been negotiated, an engine
that supports pipelining has been loaded, and max_pipelines is greater
than 1. See SSL_CTX_set_split_send_fragment(3) for further
information.
- -max_pipelines
+int
- The maximum number of encrypt/decrypt pipelines to be used. This will only
have an effect if an engine has been loaded that supports pipelining (e.g.
the dasync engine) and a suitable cipher suite has been negotiated. The
default value is 1. See SSL_CTX_set_max_pipelines(3) for further
information.
- -read_buf
+int
- The default read buffer size to be used for connections. This will only
have an effect if the buffer size is larger than the size that would
otherwise be used and pipelining is in use (see
SSL_CTX_set_default_read_buffer_len(3) for further
information).
- -ssl2, -ssl3,
-tls1, -tls1_1, -tls1_2, -tls1_3,
-no_ssl2, -no_ssl3, -no_tls1, -no_tls1_1,
-no_tls1_2, -no_tls1_3
- These options require or disable the use of the specified SSL or TLS
protocols. By default s_server will negotiate the highest mutually
supported protocol version. When a specific TLS version is required, only
that version will be accepted from the client. Note that not all protocols
and flags may be available, depending on how OpenSSL was built.
- -bugs
- There are several known bugs in SSL and TLS implementations. Adding this
option enables various workarounds.
- -no_comp
- Disable negotiation of TLS compression. TLS compression is not recommended
and is off by default as of OpenSSL 1.1.0.
- -comp
- Enable negotiation of TLS compression. This option was introduced in
OpenSSL 1.1.0. TLS compression is not recommended and is off by default as
of OpenSSL 1.1.0.
- -no_ticket
- Disable RFC4507bis session ticket support. This option has no effect if
TLSv1.3 is negotiated. See -num_tickets.
- -num_tickets
- Control the number of tickets that will be sent to the client after a full
handshake in TLSv1.3. The default number of tickets is 2. This option does
not affect the number of tickets sent after a resumption handshake.
- -serverpref
- Use the server's cipher preferences, rather than the client's
preferences.
- -prioritize_chacha
- Prioritize ChaCha ciphers when preferred by clients. Requires
-serverpref.
- -no_resumption_on_reneg
- Set the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION option.
- -client_sigalgs
val
- Signature algorithms to support for client certificate authentication
(colon-separated list).
- -named_curve
val
- Specifies the elliptic curve to use. NOTE: this is single curve, not a
list. For a list of all possible curves, use:
$ openssl ecparam -list_curves
- -cipher
val
- This allows the list of TLSv1.2 and below ciphersuites used by the server
to be modified. This list is combined with any TLSv1.3 ciphersuites that
have been configured. When the client sends a list of supported ciphers
the first client cipher also included in the server list is used. Because
the client specifies the preference order, the order of the server
cipherlist is irrelevant. See the ciphers command for more
information.
- -ciphersuites
val
- This allows the list of TLSv1.3 ciphersuites used by the server to be
modified. This list is combined with any TLSv1.2 and below ciphersuites
that have been configured. When the client sends a list of supported
ciphers the first client cipher also included in the server list is used.
Because the client specifies the preference order, the order of the server
cipherlist is irrelevant. See the ciphers command for more
information. The format for this list is a simple colon (":")
separated list of TLSv1.3 ciphersuite names.
- -dhparam
infile
- The DH parameter file to use. The ephemeral DH cipher suites generate keys
using a set of DH parameters. If not specified then an attempt is made to
load the parameters from the server certificate file. If this fails then a
static set of parameters hard coded into the s_server program will
be used.
- -attime,
-check_ss_sig, -crl_check, -crl_check_all,
-explicit_policy, -extended_crl, -ignore_critical,
-inhibit_any, -inhibit_map, -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, -x509_strict
- Set different peer certificate verification options. See the
verify(1) manual page for details.
- -crl_check,
-crl_check_all
- Check the peer certificate has not been revoked by its CA. The CRL(s) are
appended to the certificate file. With the -crl_check_all option
all CRLs of all CAs in the chain are checked.
- -nbio
- Turns on non blocking I/O.
- -psk_identity
val
- Expect the client to send PSK identity val when using a PSK cipher
suite, and warn if they do not. By default, the expected PSK identity is
the string "Client_identity".
- -psk_hint
val
- Use the PSK identity hint val when using a PSK cipher suite.
- -psk val
- Use the PSK key val when using a PSK cipher suite. The key is given
as a hexadecimal number without leading 0x, for example -psk 1a2b3c4d.
This option must be provided in order to use a PSK cipher.
- -psk_session
file
- Use the pem encoded SSL_SESSION data stored in file as the basis of
a PSK. Note that this will only work if TLSv1.3 is negotiated.
- -listen
- This option can only be used in conjunction with one of the DTLS options
above. With this option s_server will listen on a UDP port for
incoming connections. Any ClientHellos that arrive will be checked to see
if they have a cookie in them or not. Any without a cookie will be
responded to with a HelloVerifyRequest. If a ClientHello with a cookie is
received then s_server will connect to that peer and complete the
handshake.
- -dtls, -dtls1,
-dtls1_2
- These options make s_server use DTLS protocols instead of TLS. With
-dtls, s_server will negotiate any supported DTLS protocol
version, whilst -dtls1 and -dtls1_2 will only support
DTLSv1.0 and DTLSv1.2 respectively.
- -sctp
- Use SCTP for the transport protocol instead of UDP in DTLS. Must be used
in conjunction with -dtls, -dtls1 or -dtls1_2. This
option is only available where OpenSSL has support for SCTP enabled.
- -sctp_label_bug
- Use the incorrect behaviour of older OpenSSL implementations when
computing endpoint-pair shared secrets for DTLS/SCTP. This allows
communication with older broken implementations but breaks
interoperability with correct implementations. Must be used in conjunction
with -sctp. This option is only available where OpenSSL has support
for SCTP enabled.
- -no_dhe
- If this option is set then no DH parameters will be loaded effectively
disabling the ephemeral DH cipher suites.
- -alpn val,
-nextprotoneg val
- These flags enable the Application-Layer Protocol Negotiation or Next
Protocol Negotiation (NPN) extension, respectively. ALPN is the IETF
standard and replaces NPN. The val list is a comma-separated list
of supported protocol names. The list should contain the most desirable
protocols first. Protocol names are printable ASCII strings, for example
"http/1.1" or "spdy/3". The flag -nextprotoneg
cannot be specified if -tls1_3 is used.
- -engine
val
- Specifying an engine (by its unique id string in val) will cause
s_server 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.
- -keylogfile
outfile
- Appends TLS secrets to the specified keylog file such that external
programs (like Wireshark) can decrypt TLS connections.
- -max_early_data
int
- Change the default maximum early data bytes that are specified for new
sessions and any incoming early data (when used in conjunction with the
-early_data flag). The default value is approximately 16k. The
argument must be an integer greater than or equal to 0.
- -early_data
- Accept early data where possible. Cannot be used in conjunction with
-www, -WWW, -HTTP or -rev.
- -anti_replay,
-no_anti_replay
- Switches replay protection on or off, respectively. Replay protection is
on by default unless overridden by a configuration file. When it is on,
OpenSSL will automatically detect if a session ticket has been used more
than once, TLSv1.3 has been negotiated, and early data is enabled on the
server. A full handshake is forced if a session ticket is used a second or
subsequent time. Any early data that was sent will be rejected.
If a connection request is established with an SSL client and
neither the -www nor the -WWW option has been used then
normally any data received from the client is displayed and any key presses
will be sent to the client.
Certain commands are also recognized which perform special
operations. These commands are a letter which must appear at the start of a
line. They are listed below.
- q
- End the current SSL connection but still accept new connections.
- Q
- End the current SSL connection and exit.
- r
- Renegotiate the SSL session (TLSv1.2 and below only).
- R
- Renegotiate the SSL session and request a client certificate (TLSv1.2 and
below only).
- P
- Send some plain text down the underlying TCP connection: this should cause
the client to disconnect due to a protocol violation.
- S
- Print out some session cache status information.
- B
- Send a heartbeat message to the client (DTLS only)
- k
- Send a key update message to the client (TLSv1.3 only)
- K
- Send a key update message to the client and request one back (TLSv1.3
only)
- c
- Send a certificate request to the client (TLSv1.3 only)
s_server can be used to debug SSL clients. To accept
connections from a web browser the command:
openssl s_server -accept 443 -www
can be used for example.
Although specifying an empty list of CAs when requesting a client
certificate is strictly speaking a protocol violation, some SSL clients
interpret this to mean any CA is acceptable. This is useful for debugging
purposes.
The session parameters can printed out using the sess_id
program.
Because this program has a lot of options and also because some of
the techniques used are rather old, the C source of s_server is
rather hard to read and not a model of how things should be done. A typical
SSL server program would be much simpler.
The output of common ciphers is wrong: it just gives the list of
ciphers that OpenSSL recognizes and the client supports.
There should be a way for the s_server program to print out
details of any unknown cipher suites a client says it supports.
SSL_CONF_cmd(3), sess_id(1), s_client(1),
ciphers(1) SSL_CTX_set_max_send_fragment(3),
SSL_CTX_set_split_send_fragment(3),
SSL_CTX_set_max_pipelines(3)
The -no_alt_chains option was added in OpenSSL 1.1.0.
The -allow-no-dhe-kex and -prioritize_chacha options were added in
OpenSSL 1.1.1.
Copyright 2000-2021 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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Please report site issues to < webmaster AT termoneplus DOT com >
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Copyright © 2018-2024 |
, Roumen Petrov |
Авторско право 2018-2024 |
, Румен Петров |
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