473 lines
18 KiB
Groff
473 lines
18 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "S_SERVER 1"
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.TH S_SERVER 1 "2015-01-15" "1.0.1l" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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s_server \- SSL/TLS server program
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl\fR \fBs_server\fR
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[\fB\-accept port\fR]
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[\fB\-context id\fR]
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[\fB\-verify depth\fR]
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[\fB\-Verify depth\fR]
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[\fB\-crl_check\fR]
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[\fB\-crl_check_all\fR]
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[\fB\-cert filename\fR]
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[\fB\-certform DER|PEM\fR]
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[\fB\-key keyfile\fR]
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[\fB\-keyform DER|PEM\fR]
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[\fB\-pass arg\fR]
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[\fB\-dcert filename\fR]
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[\fB\-dcertform DER|PEM\fR]
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[\fB\-dkey keyfile\fR]
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[\fB\-dkeyform DER|PEM\fR]
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[\fB\-dpass arg\fR]
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[\fB\-dhparam filename\fR]
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[\fB\-nbio\fR]
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[\fB\-nbio_test\fR]
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[\fB\-crlf\fR]
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[\fB\-debug\fR]
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[\fB\-msg\fR]
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[\fB\-state\fR]
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[\fB\-CApath directory\fR]
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[\fB\-CAfile filename\fR]
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[\fB\-nocert\fR]
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[\fB\-cipher cipherlist\fR]
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[\fB\-serverpref\fR]
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[\fB\-quiet\fR]
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[\fB\-no_tmp_rsa\fR]
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[\fB\-ssl2\fR]
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[\fB\-ssl3\fR]
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[\fB\-tls1\fR]
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[\fB\-no_ssl2\fR]
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[\fB\-no_ssl3\fR]
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[\fB\-no_tls1\fR]
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[\fB\-no_dhe\fR]
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[\fB\-no_ecdhe\fR]
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[\fB\-bugs\fR]
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[\fB\-hack\fR]
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[\fB\-www\fR]
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[\fB\-WWW\fR]
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[\fB\-HTTP\fR]
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[\fB\-engine id\fR]
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[\fB\-tlsextdebug\fR]
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[\fB\-no_ticket\fR]
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[\fB\-id_prefix arg\fR]
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[\fB\-rand file(s)\fR]
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[\fB\-status\fR]
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[\fB\-status_verbose\fR]
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[\fB\-status_timeout nsec\fR]
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[\fB\-status_url url\fR]
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[\fB\-nextprotoneg protocols\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBs_server\fR command implements a generic \s-1SSL/TLS\s0 server which listens
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for connections on a given port using \s-1SSL/TLS.\s0
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.IP "\fB\-accept port\fR" 4
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.IX Item "-accept port"
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the \s-1TCP\s0 port to listen on for connections. If not specified 4433 is used.
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.IP "\fB\-context id\fR" 4
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.IX Item "-context id"
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sets the \s-1SSL\s0 context id. It can be given any string value. If this option
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is not present a default value will be used.
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.IP "\fB\-cert certname\fR" 4
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.IX Item "-cert certname"
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The certificate to use, most servers cipher suites require the use of a
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certificate and some require a certificate with a certain public key type:
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for example the \s-1DSS\s0 cipher suites require a certificate containing a \s-1DSS
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\&\s0(\s-1DSA\s0) key. If not specified then the filename \*(L"server.pem\*(R" will be used.
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.IP "\fB\-certform format\fR" 4
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.IX Item "-certform format"
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The certificate format to use: \s-1DER\s0 or \s-1PEM. PEM\s0 is the default.
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.IP "\fB\-key keyfile\fR" 4
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.IX Item "-key keyfile"
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The private key to use. If not specified then the certificate file will
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be used.
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.IP "\fB\-keyform format\fR" 4
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.IX Item "-keyform format"
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The private format to use: \s-1DER\s0 or \s-1PEM. PEM\s0 is the default.
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.IP "\fB\-pass arg\fR" 4
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.IX Item "-pass arg"
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the private key password source. For more information about the format of \fBarg\fR
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see the \fB\s-1PASS PHRASE ARGUMENTS\s0\fR section in \fIopenssl\fR\|(1).
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.IP "\fB\-dcert filename\fR, \fB\-dkey keyname\fR" 4
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.IX Item "-dcert filename, -dkey keyname"
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specify an additional certificate and private key, these behave in the
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same manner as the \fB\-cert\fR and \fB\-key\fR options except there is no default
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if they are not specified (no additional certificate and key is used). As
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noted above some cipher suites require a certificate containing a key of
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a certain type. Some cipher suites need a certificate carrying an \s-1RSA\s0 key
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and some a \s-1DSS \s0(\s-1DSA\s0) key. By using \s-1RSA\s0 and \s-1DSS\s0 certificates and keys
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a server can support clients which only support \s-1RSA\s0 or \s-1DSS\s0 cipher suites
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by using an appropriate certificate.
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.IP "\fB\-dcertform format\fR, \fB\-dkeyform format\fR, \fB\-dpass arg\fR" 4
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.IX Item "-dcertform format, -dkeyform format, -dpass arg"
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additional certificate and private key format and passphrase respectively.
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.IP "\fB\-nocert\fR" 4
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.IX Item "-nocert"
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if this option is set then no certificate is used. This restricts the
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cipher suites available to the anonymous ones (currently just anonymous
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\&\s-1DH\s0).
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.IP "\fB\-dhparam filename\fR" 4
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.IX Item "-dhparam filename"
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the \s-1DH\s0 parameter file to use. The ephemeral \s-1DH\s0 cipher suites generate keys
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using a set of \s-1DH\s0 parameters. If not specified then an attempt is made to
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load the parameters from the server certificate file. If this fails then
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a static set of parameters hard coded into the s_server program will be used.
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.IP "\fB\-no_dhe\fR" 4
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.IX Item "-no_dhe"
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if this option is set then no \s-1DH\s0 parameters will be loaded effectively
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disabling the ephemeral \s-1DH\s0 cipher suites.
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.IP "\fB\-no_ecdhe\fR" 4
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.IX Item "-no_ecdhe"
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if this option is set then no \s-1ECDH\s0 parameters will be loaded effectively
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disabling the ephemeral \s-1ECDH\s0 cipher suites.
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.IP "\fB\-no_tmp_rsa\fR" 4
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.IX Item "-no_tmp_rsa"
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certain export cipher suites sometimes use a temporary \s-1RSA\s0 key, this option
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disables temporary \s-1RSA\s0 key generation.
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.IP "\fB\-verify depth\fR, \fB\-Verify depth\fR" 4
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.IX Item "-verify depth, -Verify depth"
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The verify depth to use. This specifies the maximum length of the
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client certificate chain and makes the server request a certificate from
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the client. With the \fB\-verify\fR option a certificate is requested but the
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client does not have to send one, with the \fB\-Verify\fR option the client
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must supply a certificate or an error occurs.
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.Sp
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If the ciphersuite cannot request a client certificate (for example an
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anonymous ciphersuite or \s-1PSK\s0) this option has no effect.
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.IP "\fB\-crl_check\fR, \fB\-crl_check_all\fR" 4
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.IX Item "-crl_check, -crl_check_all"
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Check the peer certificate has not been revoked by its \s-1CA.\s0
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The \s-1CRL\s0(s) are appended to the certificate file. With the \fB\-crl_check_all\fR
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option all CRLs of all CAs in the chain are checked.
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.IP "\fB\-CApath directory\fR" 4
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.IX Item "-CApath directory"
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The directory to use for client certificate verification. This directory
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must be in \*(L"hash format\*(R", see \fBverify\fR for more information. These are
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also used when building the server certificate chain.
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.IP "\fB\-CAfile file\fR" 4
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.IX Item "-CAfile file"
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A file containing trusted certificates to use during client authentication
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and to use when attempting to build the server certificate chain. The list
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is also used in the list of acceptable client CAs passed to the client when
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a certificate is requested.
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.IP "\fB\-state\fR" 4
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.IX Item "-state"
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prints out the \s-1SSL\s0 session states.
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.IP "\fB\-debug\fR" 4
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.IX Item "-debug"
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print extensive debugging information including a hex dump of all traffic.
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.IP "\fB\-msg\fR" 4
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.IX Item "-msg"
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show all protocol messages with hex dump.
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.IP "\fB\-nbio_test\fR" 4
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.IX Item "-nbio_test"
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tests non blocking I/O
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.IP "\fB\-nbio\fR" 4
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.IX Item "-nbio"
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turns on non blocking I/O
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.IP "\fB\-crlf\fR" 4
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.IX Item "-crlf"
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this option translated a line feed from the terminal into \s-1CR+LF.\s0
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.IP "\fB\-quiet\fR" 4
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.IX Item "-quiet"
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inhibit printing of session and certificate information.
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.IP "\fB\-psk_hint hint\fR" 4
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.IX Item "-psk_hint hint"
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Use the \s-1PSK\s0 identity hint \fBhint\fR when using a \s-1PSK\s0 cipher suite.
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.IP "\fB\-psk key\fR" 4
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.IX Item "-psk key"
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Use the \s-1PSK\s0 key \fBkey\fR when using a \s-1PSK\s0 cipher suite. The key is
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given as a hexadecimal number without leading 0x, for example \-psk
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1a2b3c4d.
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.IP "\fB\-ssl2\fR, \fB\-ssl3\fR, \fB\-tls1\fR, \fB\-no_ssl2\fR, \fB\-no_ssl3\fR, \fB\-no_tls1\fR" 4
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.IX Item "-ssl2, -ssl3, -tls1, -no_ssl2, -no_ssl3, -no_tls1"
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these options disable the use of certain \s-1SSL\s0 or \s-1TLS\s0 protocols. By default
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the initial handshake uses a method which should be compatible with all
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servers and permit them to use \s-1SSL\s0 v3, \s-1SSL\s0 v2 or \s-1TLS\s0 as appropriate.
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.IP "\fB\-bugs\fR" 4
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.IX Item "-bugs"
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there are several known bug in \s-1SSL\s0 and \s-1TLS\s0 implementations. Adding this
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option enables various workarounds.
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.IP "\fB\-hack\fR" 4
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.IX Item "-hack"
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this option enables a further workaround for some some early Netscape
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\&\s-1SSL\s0 code (?).
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.IP "\fB\-cipher cipherlist\fR" 4
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.IX Item "-cipher cipherlist"
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this allows the cipher list used by the server to be modified. When
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the client sends a list of supported ciphers the first client cipher
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also included in the server list is used. Because the client specifies
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the preference order, the order of the server cipherlist irrelevant. See
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the \fBciphers\fR command for more information.
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.IP "\fB\-serverpref\fR" 4
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.IX Item "-serverpref"
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use the server's cipher preferences, rather than the client's preferences.
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.IP "\fB\-tlsextdebug\fR" 4
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.IX Item "-tlsextdebug"
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print out a hex dump of any \s-1TLS\s0 extensions received from the server.
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.IP "\fB\-no_ticket\fR" 4
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.IX Item "-no_ticket"
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disable RFC4507bis session ticket support.
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.IP "\fB\-www\fR" 4
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.IX Item "-www"
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sends a status message back to the client when it connects. This includes
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lots of information about the ciphers used and various session parameters.
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The output is in \s-1HTML\s0 format so this option will normally be used with a
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web browser.
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.IP "\fB\-WWW\fR" 4
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.IX Item "-WWW"
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emulates a simple web server. Pages will be resolved relative to the
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current directory, for example if the \s-1URL\s0 https://myhost/page.html is
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requested the file ./page.html will be loaded.
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.IP "\fB\-HTTP\fR" 4
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.IX Item "-HTTP"
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emulates a simple web server. Pages will be resolved relative to the
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current directory, for example if the \s-1URL\s0 https://myhost/page.html is
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requested the file ./page.html will be loaded. The files loaded are
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assumed to contain a complete and correct \s-1HTTP\s0 response (lines that
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are part of the \s-1HTTP\s0 response line and headers must end with \s-1CRLF\s0).
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.IP "\fB\-engine id\fR" 4
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.IX Item "-engine id"
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specifying an engine (by its unique \fBid\fR string) will cause \fBs_server\fR
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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.IP "\fB\-id_prefix arg\fR" 4
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.IX Item "-id_prefix arg"
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generate \s-1SSL/TLS\s0 session IDs prefixed by \fBarg\fR. This is mostly useful
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for testing any \s-1SSL/TLS\s0 code (eg. proxies) that wish to deal with multiple
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servers, when each of which might be generating a unique range of session
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IDs (eg. with a certain prefix).
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.IP "\fB\-rand file(s)\fR" 4
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.IX Item "-rand file(s)"
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a file or files containing random data used to seed the random number
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generator, or an \s-1EGD\s0 socket (see \fIRAND_egd\fR\|(3)).
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Multiple files can be specified separated by a OS-dependent character.
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The separator is \fB;\fR for MS-Windows, \fB,\fR for OpenVMS, and \fB:\fR for
|
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all others.
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.IP "\fB\-status\fR" 4
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.IX Item "-status"
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enables certificate status request support (aka \s-1OCSP\s0 stapling).
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|
.IP "\fB\-status_verbose\fR" 4
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.IX Item "-status_verbose"
|
|
enables certificate status request support (aka \s-1OCSP\s0 stapling) and gives
|
|
a verbose printout of the \s-1OCSP\s0 response.
|
|
.IP "\fB\-status_timeout nsec\fR" 4
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|
.IX Item "-status_timeout nsec"
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|
sets the timeout for \s-1OCSP\s0 response to \fBnsec\fR seconds.
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|
.IP "\fB\-status_url url\fR" 4
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|
.IX Item "-status_url url"
|
|
sets a fallback responder \s-1URL\s0 to use if no responder \s-1URL\s0 is present in the
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|
server certificate. Without this option an error is returned if the server
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|
certificate does not contain a responder address.
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|
.IP "\fB\-nextprotoneg protocols\fR" 4
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|
.IX Item "-nextprotoneg protocols"
|
|
enable Next Protocol Negotiation \s-1TLS\s0 extension and provide a
|
|
comma-separated list of supported protocol names.
|
|
The list should contain most wanted protocols first.
|
|
Protocol names are printable \s-1ASCII\s0 strings, for example \*(L"http/1.1\*(R" or
|
|
\&\*(L"spdy/3\*(R".
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|
.SH "CONNECTED COMMANDS"
|
|
.IX Header "CONNECTED COMMANDS"
|
|
If a connection request is established with an \s-1SSL\s0 client and neither the
|
|
\&\fB\-www\fR nor the \fB\-WWW\fR option has been used then normally any data received
|
|
from the client is displayed and any key presses will be sent to the client.
|
|
.PP
|
|
Certain single letter commands are also recognized which perform special
|
|
operations: these are listed below.
|
|
.IP "\fBq\fR" 4
|
|
.IX Item "q"
|
|
end the current \s-1SSL\s0 connection but still accept new connections.
|
|
.IP "\fBQ\fR" 4
|
|
.IX Item "Q"
|
|
end the current \s-1SSL\s0 connection and exit.
|
|
.IP "\fBr\fR" 4
|
|
.IX Item "r"
|
|
renegotiate the \s-1SSL\s0 session.
|
|
.IP "\fBR\fR" 4
|
|
.IX Item "R"
|
|
renegotiate the \s-1SSL\s0 session and request a client certificate.
|
|
.IP "\fBP\fR" 4
|
|
.IX Item "P"
|
|
send some plain text down the underlying \s-1TCP\s0 connection: this should
|
|
cause the client to disconnect due to a protocol violation.
|
|
.IP "\fBS\fR" 4
|
|
.IX Item "S"
|
|
print out some session cache status information.
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
\&\fBs_server\fR can be used to debug \s-1SSL\s0 clients. To accept connections from
|
|
a web browser the command:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl s_server \-accept 443 \-www
|
|
.Ve
|
|
.PP
|
|
can be used for example.
|
|
.PP
|
|
Most web browsers (in particular Netscape and \s-1MSIE\s0) only support \s-1RSA\s0 cipher
|
|
suites, so they cannot connect to servers which don't use a certificate
|
|
carrying an \s-1RSA\s0 key or a version of OpenSSL with \s-1RSA\s0 disabled.
|
|
.PP
|
|
Although specifying an empty list of CAs when requesting a client certificate
|
|
is strictly speaking a protocol violation, some \s-1SSL\s0 clients interpret this to
|
|
mean any \s-1CA\s0 is acceptable. This is useful for debugging purposes.
|
|
.PP
|
|
The session parameters can printed out using the \fBsess_id\fR program.
|
|
.SH "BUGS"
|
|
.IX Header "BUGS"
|
|
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
|
|
\&\s-1SSL\s0 server program would be much simpler.
|
|
.PP
|
|
The output of common ciphers is wrong: it just gives the list of ciphers that
|
|
OpenSSL recognizes and the client supports.
|
|
.PP
|
|
There should be a way for the \fBs_server\fR program to print out details of any
|
|
unknown cipher suites a client says it supports.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIsess_id\fR\|(1), \fIs_client\fR\|(1), \fIciphers\fR\|(1)
|