900 lines
35 KiB
Groff
900 lines
35 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "X509 1"
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.TH X509 1 "2015-03-19" "1.0.1m" "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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x509 \- Certificate display and signing utility
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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\&\fBopenssl\fR \fBx509\fR
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[\fB\-inform DER|PEM|NET\fR]
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[\fB\-outform DER|PEM|NET\fR]
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[\fB\-keyform DER|PEM\fR]
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[\fB\-CAform DER|PEM\fR]
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[\fB\-CAkeyform DER|PEM\fR]
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[\fB\-in filename\fR]
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[\fB\-out filename\fR]
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[\fB\-serial\fR]
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[\fB\-hash\fR]
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[\fB\-subject_hash\fR]
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[\fB\-issuer_hash\fR]
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[\fB\-ocspid\fR]
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[\fB\-subject\fR]
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[\fB\-issuer\fR]
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[\fB\-nameopt option\fR]
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[\fB\-email\fR]
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[\fB\-ocsp_uri\fR]
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[\fB\-startdate\fR]
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[\fB\-enddate\fR]
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[\fB\-purpose\fR]
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[\fB\-dates\fR]
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[\fB\-checkend num\fR]
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[\fB\-modulus\fR]
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[\fB\-pubkey\fR]
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[\fB\-fingerprint\fR]
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[\fB\-alias\fR]
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[\fB\-noout\fR]
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[\fB\-trustout\fR]
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[\fB\-clrtrust\fR]
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[\fB\-clrreject\fR]
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[\fB\-addtrust arg\fR]
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[\fB\-addreject arg\fR]
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[\fB\-setalias arg\fR]
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[\fB\-days arg\fR]
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[\fB\-set_serial n\fR]
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[\fB\-signkey filename\fR]
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[\fB\-passin arg\fR]
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[\fB\-x509toreq\fR]
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[\fB\-req\fR]
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[\fB\-CA filename\fR]
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[\fB\-CAkey filename\fR]
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[\fB\-CAcreateserial\fR]
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[\fB\-CAserial filename\fR]
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[\fB\-text\fR]
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[\fB\-certopt option\fR]
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[\fB\-C\fR]
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[\fB\-md2|\-md5|\-sha1|\-mdc2\fR]
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[\fB\-clrext\fR]
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[\fB\-extfile filename\fR]
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[\fB\-extensions section\fR]
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[\fB\-engine id\fR]
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \fBx509\fR command is a multi purpose certificate utility. It can be
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used to display certificate information, convert certificates to
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various forms, sign certificate requests like a \*(L"mini \s-1CA\*(R"\s0 or edit
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certificate trust settings.
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.PP
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Since there are a large number of options they will split up into
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various sections.
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.SH "OPTIONS"
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.IX Header "OPTIONS"
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.SS "\s-1INPUT, OUTPUT AND GENERAL PURPOSE OPTIONS\s0"
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.IX Subsection "INPUT, OUTPUT AND GENERAL PURPOSE OPTIONS"
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.IP "\fB\-inform DER|PEM|NET\fR" 4
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.IX Item "-inform DER|PEM|NET"
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This specifies the input format normally the command will expect an X509
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certificate but this can change if other options such as \fB\-req\fR are
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present. The \s-1DER\s0 format is the \s-1DER\s0 encoding of the certificate and \s-1PEM\s0
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is the base64 encoding of the \s-1DER\s0 encoding with header and footer lines
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added. The \s-1NET\s0 option is an obscure Netscape server format that is now
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obsolete.
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.IP "\fB\-outform DER|PEM|NET\fR" 4
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.IX Item "-outform DER|PEM|NET"
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This specifies the output format, the options have the same meaning as the
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\&\fB\-inform\fR option.
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.IP "\fB\-in filename\fR" 4
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.IX Item "-in filename"
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This specifies the input filename to read a certificate from or standard input
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if this option is not specified.
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.IP "\fB\-out filename\fR" 4
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.IX Item "-out filename"
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This specifies the output filename to write to or standard output by
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default.
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.IP "\fB\-md2|\-md5|\-sha1|\-mdc2\fR" 4
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.IX Item "-md2|-md5|-sha1|-mdc2"
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the digest to use. This affects any signing or display option that uses a message
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digest, such as the \fB\-fingerprint\fR, \fB\-signkey\fR and \fB\-CA\fR options. If not
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specified then \s-1SHA1\s0 is used. If the key being used to sign with is a \s-1DSA\s0 key
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then this option has no effect: \s-1SHA1\s0 is always used with \s-1DSA\s0 keys.
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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 \fBx509\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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.SS "\s-1DISPLAY OPTIONS\s0"
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.IX Subsection "DISPLAY OPTIONS"
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Note: the \fB\-alias\fR and \fB\-purpose\fR options are also display options
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but are described in the \fB\s-1TRUST SETTINGS\s0\fR section.
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.IP "\fB\-text\fR" 4
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.IX Item "-text"
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prints out the certificate in text form. Full details are output including the
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public key, signature algorithms, issuer and subject names, serial number
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any extensions present and any trust settings.
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.IP "\fB\-certopt option\fR" 4
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.IX Item "-certopt option"
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customise the output format used with \fB\-text\fR. The \fBoption\fR argument can be
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a single option or multiple options separated by commas. The \fB\-certopt\fR switch
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may be also be used more than once to set multiple options. See the \fB\s-1TEXT OPTIONS\s0\fR
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section for more information.
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.IP "\fB\-noout\fR" 4
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.IX Item "-noout"
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this option prevents output of the encoded version of the request.
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.IP "\fB\-pubkey\fR" 4
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.IX Item "-pubkey"
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outputs the certificate's SubjectPublicKeyInfo block in \s-1PEM\s0 format.
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.IP "\fB\-modulus\fR" 4
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.IX Item "-modulus"
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this option prints out the value of the modulus of the public key
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contained in the certificate.
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.IP "\fB\-serial\fR" 4
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.IX Item "-serial"
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outputs the certificate serial number.
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.IP "\fB\-subject_hash\fR" 4
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.IX Item "-subject_hash"
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outputs the \*(L"hash\*(R" of the certificate subject name. This is used in OpenSSL to
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form an index to allow certificates in a directory to be looked up by subject
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name.
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.IP "\fB\-issuer_hash\fR" 4
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.IX Item "-issuer_hash"
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outputs the \*(L"hash\*(R" of the certificate issuer name.
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.IP "\fB\-ocspid\fR" 4
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.IX Item "-ocspid"
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outputs the \s-1OCSP\s0 hash values for the subject name and public key.
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.IP "\fB\-hash\fR" 4
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.IX Item "-hash"
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synonym for \*(L"\-subject_hash\*(R" for backward compatibility reasons.
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.IP "\fB\-subject_hash_old\fR" 4
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.IX Item "-subject_hash_old"
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outputs the \*(L"hash\*(R" of the certificate subject name using the older algorithm
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as used by OpenSSL versions before 1.0.0.
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.IP "\fB\-issuer_hash_old\fR" 4
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.IX Item "-issuer_hash_old"
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outputs the \*(L"hash\*(R" of the certificate issuer name using the older algorithm
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as used by OpenSSL versions before 1.0.0.
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.IP "\fB\-subject\fR" 4
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.IX Item "-subject"
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outputs the subject name.
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.IP "\fB\-issuer\fR" 4
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.IX Item "-issuer"
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outputs the issuer name.
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.IP "\fB\-nameopt option\fR" 4
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.IX Item "-nameopt option"
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option which determines how the subject or issuer names are displayed. The
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\&\fBoption\fR argument can be a single option or multiple options separated by
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commas. Alternatively the \fB\-nameopt\fR switch may be used more than once to
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set multiple options. See the \fB\s-1NAME OPTIONS\s0\fR section for more information.
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.IP "\fB\-email\fR" 4
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.IX Item "-email"
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outputs the email address(es) if any.
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.IP "\fB\-ocsp_uri\fR" 4
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.IX Item "-ocsp_uri"
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outputs the \s-1OCSP\s0 responder address(es) if any.
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.IP "\fB\-startdate\fR" 4
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.IX Item "-startdate"
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prints out the start date of the certificate, that is the notBefore date.
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.IP "\fB\-enddate\fR" 4
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.IX Item "-enddate"
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prints out the expiry date of the certificate, that is the notAfter date.
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.IP "\fB\-dates\fR" 4
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.IX Item "-dates"
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prints out the start and expiry dates of a certificate.
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.IP "\fB\-checkend arg\fR" 4
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.IX Item "-checkend arg"
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checks if the certificate expires within the next \fBarg\fR seconds and exits
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non-zero if yes it will expire or zero if not.
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.IP "\fB\-fingerprint\fR" 4
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.IX Item "-fingerprint"
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prints out the digest of the \s-1DER\s0 encoded version of the whole certificate
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(see digest options).
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.IP "\fB\-C\fR" 4
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.IX Item "-C"
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this outputs the certificate in the form of a C source file.
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.SS "\s-1TRUST SETTINGS\s0"
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.IX Subsection "TRUST SETTINGS"
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Please note these options are currently experimental and may well change.
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.PP
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A \fBtrusted certificate\fR is an ordinary certificate which has several
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additional pieces of information attached to it such as the permitted
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and prohibited uses of the certificate and an \*(L"alias\*(R".
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.PP
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Normally when a certificate is being verified at least one certificate
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must be \*(L"trusted\*(R". By default a trusted certificate must be stored
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locally and must be a root \s-1CA:\s0 any certificate chain ending in this \s-1CA\s0
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is then usable for any purpose.
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.PP
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Trust settings currently are only used with a root \s-1CA.\s0 They allow a finer
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control over the purposes the root \s-1CA\s0 can be used for. For example a \s-1CA\s0
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may be trusted for \s-1SSL\s0 client but not \s-1SSL\s0 server use.
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.PP
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See the description of the \fBverify\fR utility for more information on the
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meaning of trust settings.
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.PP
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Future versions of OpenSSL will recognize trust settings on any
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certificate: not just root CAs.
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.IP "\fB\-trustout\fR" 4
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.IX Item "-trustout"
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this causes \fBx509\fR to output a \fBtrusted\fR certificate. An ordinary
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or trusted certificate can be input but by default an ordinary
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certificate is output and any trust settings are discarded. With the
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\&\fB\-trustout\fR option a trusted certificate is output. A trusted
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certificate is automatically output if any trust settings are modified.
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.IP "\fB\-setalias arg\fR" 4
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.IX Item "-setalias arg"
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sets the alias of the certificate. This will allow the certificate
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to be referred to using a nickname for example \*(L"Steve's Certificate\*(R".
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.IP "\fB\-alias\fR" 4
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.IX Item "-alias"
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outputs the certificate alias, if any.
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.IP "\fB\-clrtrust\fR" 4
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.IX Item "-clrtrust"
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clears all the permitted or trusted uses of the certificate.
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.IP "\fB\-clrreject\fR" 4
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.IX Item "-clrreject"
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clears all the prohibited or rejected uses of the certificate.
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.IP "\fB\-addtrust arg\fR" 4
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.IX Item "-addtrust arg"
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adds a trusted certificate use. Any object name can be used here
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but currently only \fBclientAuth\fR (\s-1SSL\s0 client use), \fBserverAuth\fR
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(\s-1SSL\s0 server use) and \fBemailProtection\fR (S/MIME email) are used.
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Other OpenSSL applications may define additional uses.
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.IP "\fB\-addreject arg\fR" 4
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.IX Item "-addreject arg"
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adds a prohibited use. It accepts the same values as the \fB\-addtrust\fR
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option.
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.IP "\fB\-purpose\fR" 4
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.IX Item "-purpose"
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this option performs tests on the certificate extensions and outputs
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the results. For a more complete description see the \fB\s-1CERTIFICATE
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EXTENSIONS\s0\fR section.
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.SS "\s-1SIGNING OPTIONS\s0"
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.IX Subsection "SIGNING OPTIONS"
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The \fBx509\fR utility can be used to sign certificates and requests: it
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can thus behave like a \*(L"mini \s-1CA\*(R".\s0
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.IP "\fB\-signkey filename\fR" 4
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.IX Item "-signkey filename"
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this option causes the input file to be self signed using the supplied
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private key.
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.Sp
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If the input file is a certificate it sets the issuer name to the
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subject name (i.e. makes it self signed) changes the public key to the
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supplied value and changes the start and end dates. The start date is
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set to the current time and the end date is set to a value determined
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by the \fB\-days\fR option. Any certificate extensions are retained unless
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the \fB\-clrext\fR option is supplied.
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.Sp
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If the input is a certificate request then a self signed certificate
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is created using the supplied private key using the subject name in
|
|
the request.
|
|
.IP "\fB\-passin arg\fR" 4
|
|
.IX Item "-passin arg"
|
|
the key password source. For more information about the format of \fBarg\fR
|
|
see the \fB\s-1PASS PHRASE ARGUMENTS\s0\fR section in \fIopenssl\fR\|(1).
|
|
.IP "\fB\-clrext\fR" 4
|
|
.IX Item "-clrext"
|
|
delete any extensions from a certificate. This option is used when a
|
|
certificate is being created from another certificate (for example with
|
|
the \fB\-signkey\fR or the \fB\-CA\fR options). Normally all extensions are
|
|
retained.
|
|
.IP "\fB\-keyform PEM|DER\fR" 4
|
|
.IX Item "-keyform PEM|DER"
|
|
specifies the format (\s-1DER\s0 or \s-1PEM\s0) of the private key file used in the
|
|
\&\fB\-signkey\fR option.
|
|
.IP "\fB\-days arg\fR" 4
|
|
.IX Item "-days arg"
|
|
specifies the number of days to make a certificate valid for. The default
|
|
is 30 days.
|
|
.IP "\fB\-x509toreq\fR" 4
|
|
.IX Item "-x509toreq"
|
|
converts a certificate into a certificate request. The \fB\-signkey\fR option
|
|
is used to pass the required private key.
|
|
.IP "\fB\-req\fR" 4
|
|
.IX Item "-req"
|
|
by default a certificate is expected on input. With this option a
|
|
certificate request is expected instead.
|
|
.IP "\fB\-set_serial n\fR" 4
|
|
.IX Item "-set_serial n"
|
|
specifies the serial number to use. This option can be used with either
|
|
the \fB\-signkey\fR or \fB\-CA\fR options. If used in conjunction with the \fB\-CA\fR
|
|
option the serial number file (as specified by the \fB\-CAserial\fR or
|
|
\&\fB\-CAcreateserial\fR options) is not used.
|
|
.Sp
|
|
The serial number can be decimal or hex (if preceded by \fB0x\fR). Negative
|
|
serial numbers can also be specified but their use is not recommended.
|
|
.IP "\fB\-CA filename\fR" 4
|
|
.IX Item "-CA filename"
|
|
specifies the \s-1CA\s0 certificate to be used for signing. When this option is
|
|
present \fBx509\fR behaves like a \*(L"mini \s-1CA\*(R".\s0 The input file is signed by this
|
|
\&\s-1CA\s0 using this option: that is its issuer name is set to the subject name
|
|
of the \s-1CA\s0 and it is digitally signed using the CAs private key.
|
|
.Sp
|
|
This option is normally combined with the \fB\-req\fR option. Without the
|
|
\&\fB\-req\fR option the input is a certificate which must be self signed.
|
|
.IP "\fB\-CAkey filename\fR" 4
|
|
.IX Item "-CAkey filename"
|
|
sets the \s-1CA\s0 private key to sign a certificate with. If this option is
|
|
not specified then it is assumed that the \s-1CA\s0 private key is present in
|
|
the \s-1CA\s0 certificate file.
|
|
.IP "\fB\-CAserial filename\fR" 4
|
|
.IX Item "-CAserial filename"
|
|
sets the \s-1CA\s0 serial number file to use.
|
|
.Sp
|
|
When the \fB\-CA\fR option is used to sign a certificate it uses a serial
|
|
number specified in a file. This file consist of one line containing
|
|
an even number of hex digits with the serial number to use. After each
|
|
use the serial number is incremented and written out to the file again.
|
|
.Sp
|
|
The default filename consists of the \s-1CA\s0 certificate file base name with
|
|
\&\*(L".srl\*(R" appended. For example if the \s-1CA\s0 certificate file is called
|
|
\&\*(L"mycacert.pem\*(R" it expects to find a serial number file called \*(L"mycacert.srl\*(R".
|
|
.IP "\fB\-CAcreateserial\fR" 4
|
|
.IX Item "-CAcreateserial"
|
|
with this option the \s-1CA\s0 serial number file is created if it does not exist:
|
|
it will contain the serial number \*(L"02\*(R" and the certificate being signed will
|
|
have the 1 as its serial number. Normally if the \fB\-CA\fR option is specified
|
|
and the serial number file does not exist it is an error.
|
|
.IP "\fB\-extfile filename\fR" 4
|
|
.IX Item "-extfile filename"
|
|
file containing certificate extensions to use. If not specified then
|
|
no extensions are added to the certificate.
|
|
.IP "\fB\-extensions section\fR" 4
|
|
.IX Item "-extensions section"
|
|
the section to add certificate extensions from. If this option is not
|
|
specified then the extensions should either be contained in the unnamed
|
|
(default) section or the default section should contain a variable called
|
|
\&\*(L"extensions\*(R" which contains the section to use. See the
|
|
\&\fIx509v3_config\fR\|(5) manual page for details of the
|
|
extension section format.
|
|
.SS "\s-1NAME OPTIONS\s0"
|
|
.IX Subsection "NAME OPTIONS"
|
|
The \fBnameopt\fR command line switch determines how the subject and issuer
|
|
names are displayed. If no \fBnameopt\fR switch is present the default \*(L"oneline\*(R"
|
|
format is used which is compatible with previous versions of OpenSSL.
|
|
Each option is described in detail below, all options can be preceded by
|
|
a \fB\-\fR to turn the option off. Only the first four will normally be used.
|
|
.IP "\fBcompat\fR" 4
|
|
.IX Item "compat"
|
|
use the old format. This is equivalent to specifying no name options at all.
|
|
.IP "\fB\s-1RFC2253\s0\fR" 4
|
|
.IX Item "RFC2253"
|
|
displays names compatible with \s-1RFC2253\s0 equivalent to \fBesc_2253\fR, \fBesc_ctrl\fR,
|
|
\&\fBesc_msb\fR, \fButf8\fR, \fBdump_nostr\fR, \fBdump_unknown\fR, \fBdump_der\fR,
|
|
\&\fBsep_comma_plus\fR, \fBdn_rev\fR and \fBsname\fR.
|
|
.IP "\fBoneline\fR" 4
|
|
.IX Item "oneline"
|
|
a oneline format which is more readable than \s-1RFC2253.\s0 It is equivalent to
|
|
specifying the \fBesc_2253\fR, \fBesc_ctrl\fR, \fBesc_msb\fR, \fButf8\fR, \fBdump_nostr\fR,
|
|
\&\fBdump_der\fR, \fBuse_quote\fR, \fBsep_comma_plus_space\fR, \fBspace_eq\fR and \fBsname\fR
|
|
options.
|
|
.IP "\fBmultiline\fR" 4
|
|
.IX Item "multiline"
|
|
a multiline format. It is equivalent \fBesc_ctrl\fR, \fBesc_msb\fR, \fBsep_multiline\fR,
|
|
\&\fBspace_eq\fR, \fBlname\fR and \fBalign\fR.
|
|
.IP "\fBesc_2253\fR" 4
|
|
.IX Item "esc_2253"
|
|
escape the \*(L"special\*(R" characters required by \s-1RFC2253\s0 in a field That is
|
|
\&\fB,+"<>;\fR. Additionally \fB#\fR is escaped at the beginning of a string
|
|
and a space character at the beginning or end of a string.
|
|
.IP "\fBesc_ctrl\fR" 4
|
|
.IX Item "esc_ctrl"
|
|
escape control characters. That is those with \s-1ASCII\s0 values less than
|
|
0x20 (space) and the delete (0x7f) character. They are escaped using the
|
|
\&\s-1RFC2253\s0 \eXX notation (where \s-1XX\s0 are two hex digits representing the
|
|
character value).
|
|
.IP "\fBesc_msb\fR" 4
|
|
.IX Item "esc_msb"
|
|
escape characters with the \s-1MSB\s0 set, that is with \s-1ASCII\s0 values larger than
|
|
127.
|
|
.IP "\fBuse_quote\fR" 4
|
|
.IX Item "use_quote"
|
|
escapes some characters by surrounding the whole string with \fB"\fR characters,
|
|
without the option all escaping is done with the \fB\e\fR character.
|
|
.IP "\fButf8\fR" 4
|
|
.IX Item "utf8"
|
|
convert all strings to \s-1UTF8\s0 format first. This is required by \s-1RFC2253.\s0 If
|
|
you are lucky enough to have a \s-1UTF8\s0 compatible terminal then the use
|
|
of this option (and \fBnot\fR setting \fBesc_msb\fR) may result in the correct
|
|
display of multibyte (international) characters. Is this option is not
|
|
present then multibyte characters larger than 0xff will be represented
|
|
using the format \eUXXXX for 16 bits and \eWXXXXXXXX for 32 bits.
|
|
Also if this option is off any UTF8Strings will be converted to their
|
|
character form first.
|
|
.IP "\fBignore_type\fR" 4
|
|
.IX Item "ignore_type"
|
|
this option does not attempt to interpret multibyte characters in any
|
|
way. That is their content octets are merely dumped as though one octet
|
|
represents each character. This is useful for diagnostic purposes but
|
|
will result in rather odd looking output.
|
|
.IP "\fBshow_type\fR" 4
|
|
.IX Item "show_type"
|
|
show the type of the \s-1ASN1\s0 character string. The type precedes the
|
|
field contents. For example \*(L"\s-1BMPSTRING:\s0 Hello World\*(R".
|
|
.IP "\fBdump_der\fR" 4
|
|
.IX Item "dump_der"
|
|
when this option is set any fields that need to be hexdumped will
|
|
be dumped using the \s-1DER\s0 encoding of the field. Otherwise just the
|
|
content octets will be displayed. Both options use the \s-1RFC2253
|
|
\&\s0\fB#XXXX...\fR format.
|
|
.IP "\fBdump_nostr\fR" 4
|
|
.IX Item "dump_nostr"
|
|
dump non character string types (for example \s-1OCTET STRING\s0) if this
|
|
option is not set then non character string types will be displayed
|
|
as though each content octet represents a single character.
|
|
.IP "\fBdump_all\fR" 4
|
|
.IX Item "dump_all"
|
|
dump all fields. This option when used with \fBdump_der\fR allows the
|
|
\&\s-1DER\s0 encoding of the structure to be unambiguously determined.
|
|
.IP "\fBdump_unknown\fR" 4
|
|
.IX Item "dump_unknown"
|
|
dump any field whose \s-1OID\s0 is not recognised by OpenSSL.
|
|
.IP "\fBsep_comma_plus\fR, \fBsep_comma_plus_space\fR, \fBsep_semi_plus_space\fR, \fBsep_multiline\fR" 4
|
|
.IX Item "sep_comma_plus, sep_comma_plus_space, sep_semi_plus_space, sep_multiline"
|
|
these options determine the field separators. The first character is
|
|
between RDNs and the second between multiple AVAs (multiple AVAs are
|
|
very rare and their use is discouraged). The options ending in
|
|
\&\*(L"space\*(R" additionally place a space after the separator to make it
|
|
more readable. The \fBsep_multiline\fR uses a linefeed character for
|
|
the \s-1RDN\s0 separator and a spaced \fB+\fR for the \s-1AVA\s0 separator. It also
|
|
indents the fields by four characters.
|
|
.IP "\fBdn_rev\fR" 4
|
|
.IX Item "dn_rev"
|
|
reverse the fields of the \s-1DN.\s0 This is required by \s-1RFC2253.\s0 As a side
|
|
effect this also reverses the order of multiple AVAs but this is
|
|
permissible.
|
|
.IP "\fBnofname\fR, \fBsname\fR, \fBlname\fR, \fBoid\fR" 4
|
|
.IX Item "nofname, sname, lname, oid"
|
|
these options alter how the field name is displayed. \fBnofname\fR does
|
|
not display the field at all. \fBsname\fR uses the \*(L"short name\*(R" form
|
|
(\s-1CN\s0 for commonName for example). \fBlname\fR uses the long form.
|
|
\&\fBoid\fR represents the \s-1OID\s0 in numerical form and is useful for
|
|
diagnostic purpose.
|
|
.IP "\fBalign\fR" 4
|
|
.IX Item "align"
|
|
align field values for a more readable output. Only usable with
|
|
\&\fBsep_multiline\fR.
|
|
.IP "\fBspace_eq\fR" 4
|
|
.IX Item "space_eq"
|
|
places spaces round the \fB=\fR character which follows the field
|
|
name.
|
|
.SS "\s-1TEXT OPTIONS\s0"
|
|
.IX Subsection "TEXT OPTIONS"
|
|
As well as customising the name output format, it is also possible to
|
|
customise the actual fields printed using the \fBcertopt\fR options when
|
|
the \fBtext\fR option is present. The default behaviour is to print all fields.
|
|
.IP "\fBcompatible\fR" 4
|
|
.IX Item "compatible"
|
|
use the old format. This is equivalent to specifying no output options at all.
|
|
.IP "\fBno_header\fR" 4
|
|
.IX Item "no_header"
|
|
don't print header information: that is the lines saying \*(L"Certificate\*(R" and \*(L"Data\*(R".
|
|
.IP "\fBno_version\fR" 4
|
|
.IX Item "no_version"
|
|
don't print out the version number.
|
|
.IP "\fBno_serial\fR" 4
|
|
.IX Item "no_serial"
|
|
don't print out the serial number.
|
|
.IP "\fBno_signame\fR" 4
|
|
.IX Item "no_signame"
|
|
don't print out the signature algorithm used.
|
|
.IP "\fBno_validity\fR" 4
|
|
.IX Item "no_validity"
|
|
don't print the validity, that is the \fBnotBefore\fR and \fBnotAfter\fR fields.
|
|
.IP "\fBno_subject\fR" 4
|
|
.IX Item "no_subject"
|
|
don't print out the subject name.
|
|
.IP "\fBno_issuer\fR" 4
|
|
.IX Item "no_issuer"
|
|
don't print out the issuer name.
|
|
.IP "\fBno_pubkey\fR" 4
|
|
.IX Item "no_pubkey"
|
|
don't print out the public key.
|
|
.IP "\fBno_sigdump\fR" 4
|
|
.IX Item "no_sigdump"
|
|
don't give a hexadecimal dump of the certificate signature.
|
|
.IP "\fBno_aux\fR" 4
|
|
.IX Item "no_aux"
|
|
don't print out certificate trust information.
|
|
.IP "\fBno_extensions\fR" 4
|
|
.IX Item "no_extensions"
|
|
don't print out any X509V3 extensions.
|
|
.IP "\fBext_default\fR" 4
|
|
.IX Item "ext_default"
|
|
retain default extension behaviour: attempt to print out unsupported certificate extensions.
|
|
.IP "\fBext_error\fR" 4
|
|
.IX Item "ext_error"
|
|
print an error message for unsupported certificate extensions.
|
|
.IP "\fBext_parse\fR" 4
|
|
.IX Item "ext_parse"
|
|
\&\s-1ASN1\s0 parse unsupported extensions.
|
|
.IP "\fBext_dump\fR" 4
|
|
.IX Item "ext_dump"
|
|
hex dump unsupported extensions.
|
|
.IP "\fBca_default\fR" 4
|
|
.IX Item "ca_default"
|
|
the value used by the \fBca\fR utility, equivalent to \fBno_issuer\fR, \fBno_pubkey\fR, \fBno_header\fR,
|
|
\&\fBno_version\fR, \fBno_sigdump\fR and \fBno_signame\fR.
|
|
.SH "EXAMPLES"
|
|
.IX Header "EXAMPLES"
|
|
Note: in these examples the '\e' means the example should be all on one
|
|
line.
|
|
.PP
|
|
Display the contents of a certificate:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-in cert.pem \-noout \-text
|
|
.Ve
|
|
.PP
|
|
Display the certificate serial number:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-in cert.pem \-noout \-serial
|
|
.Ve
|
|
.PP
|
|
Display the certificate subject name:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-in cert.pem \-noout \-subject
|
|
.Ve
|
|
.PP
|
|
Display the certificate subject name in \s-1RFC2253\s0 form:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-in cert.pem \-noout \-subject \-nameopt RFC2253
|
|
.Ve
|
|
.PP
|
|
Display the certificate subject name in oneline form on a terminal
|
|
supporting \s-1UTF8:\s0
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-in cert.pem \-noout \-subject \-nameopt oneline,\-esc_msb
|
|
.Ve
|
|
.PP
|
|
Display the certificate \s-1MD5\s0 fingerprint:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-in cert.pem \-noout \-fingerprint
|
|
.Ve
|
|
.PP
|
|
Display the certificate \s-1SHA1\s0 fingerprint:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-sha1 \-in cert.pem \-noout \-fingerprint
|
|
.Ve
|
|
.PP
|
|
Convert a certificate from \s-1PEM\s0 to \s-1DER\s0 format:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-in cert.pem \-inform PEM \-out cert.der \-outform DER
|
|
.Ve
|
|
.PP
|
|
Convert a certificate to a certificate request:
|
|
.PP
|
|
.Vb 1
|
|
\& openssl x509 \-x509toreq \-in cert.pem \-out req.pem \-signkey key.pem
|
|
.Ve
|
|
.PP
|
|
Convert a certificate request into a self signed certificate using
|
|
extensions for a \s-1CA:\s0
|
|
.PP
|
|
.Vb 2
|
|
\& openssl x509 \-req \-in careq.pem \-extfile openssl.cnf \-extensions v3_ca \e
|
|
\& \-signkey key.pem \-out cacert.pem
|
|
.Ve
|
|
.PP
|
|
Sign a certificate request using the \s-1CA\s0 certificate above and add user
|
|
certificate extensions:
|
|
.PP
|
|
.Vb 2
|
|
\& openssl x509 \-req \-in req.pem \-extfile openssl.cnf \-extensions v3_usr \e
|
|
\& \-CA cacert.pem \-CAkey key.pem \-CAcreateserial
|
|
.Ve
|
|
.PP
|
|
Set a certificate to be trusted for \s-1SSL\s0 client use and change set its alias to
|
|
\&\*(L"Steve's Class 1 \s-1CA\*(R"\s0
|
|
.PP
|
|
.Vb 2
|
|
\& openssl x509 \-in cert.pem \-addtrust clientAuth \e
|
|
\& \-setalias "Steve\*(Aqs Class 1 CA" \-out trust.pem
|
|
.Ve
|
|
.SH "NOTES"
|
|
.IX Header "NOTES"
|
|
The \s-1PEM\s0 format uses the header and footer lines:
|
|
.PP
|
|
.Vb 2
|
|
\& \-\-\-\-\-BEGIN CERTIFICATE\-\-\-\-\-
|
|
\& \-\-\-\-\-END CERTIFICATE\-\-\-\-\-
|
|
.Ve
|
|
.PP
|
|
it will also handle files containing:
|
|
.PP
|
|
.Vb 2
|
|
\& \-\-\-\-\-BEGIN X509 CERTIFICATE\-\-\-\-\-
|
|
\& \-\-\-\-\-END X509 CERTIFICATE\-\-\-\-\-
|
|
.Ve
|
|
.PP
|
|
Trusted certificates have the lines
|
|
.PP
|
|
.Vb 2
|
|
\& \-\-\-\-\-BEGIN TRUSTED CERTIFICATE\-\-\-\-\-
|
|
\& \-\-\-\-\-END TRUSTED CERTIFICATE\-\-\-\-\-
|
|
.Ve
|
|
.PP
|
|
The conversion to \s-1UTF8\s0 format used with the name options assumes that
|
|
T61Strings use the \s-1ISO8859\-1\s0 character set. This is wrong but Netscape
|
|
and \s-1MSIE\s0 do this as do many certificates. So although this is incorrect
|
|
it is more likely to display the majority of certificates correctly.
|
|
.PP
|
|
The \fB\-fingerprint\fR option takes the digest of the \s-1DER\s0 encoded certificate.
|
|
This is commonly called a \*(L"fingerprint\*(R". Because of the nature of message
|
|
digests the fingerprint of a certificate is unique to that certificate and
|
|
two certificates with the same fingerprint can be considered to be the same.
|
|
.PP
|
|
The Netscape fingerprint uses \s-1MD5\s0 whereas \s-1MSIE\s0 uses \s-1SHA1.\s0
|
|
.PP
|
|
The \fB\-email\fR option searches the subject name and the subject alternative
|
|
name extension. Only unique email addresses will be printed out: it will
|
|
not print the same address more than once.
|
|
.SH "CERTIFICATE EXTENSIONS"
|
|
.IX Header "CERTIFICATE EXTENSIONS"
|
|
The \fB\-purpose\fR option checks the certificate extensions and determines
|
|
what the certificate can be used for. The actual checks done are rather
|
|
complex and include various hacks and workarounds to handle broken
|
|
certificates and software.
|
|
.PP
|
|
The same code is used when verifying untrusted certificates in chains
|
|
so this section is useful if a chain is rejected by the verify code.
|
|
.PP
|
|
The basicConstraints extension \s-1CA\s0 flag is used to determine whether the
|
|
certificate can be used as a \s-1CA.\s0 If the \s-1CA\s0 flag is true then it is a \s-1CA,\s0
|
|
if the \s-1CA\s0 flag is false then it is not a \s-1CA. \s0\fBAll\fR CAs should have the
|
|
\&\s-1CA\s0 flag set to true.
|
|
.PP
|
|
If the basicConstraints extension is absent then the certificate is
|
|
considered to be a \*(L"possible \s-1CA\*(R"\s0 other extensions are checked according
|
|
to the intended use of the certificate. A warning is given in this case
|
|
because the certificate should really not be regarded as a \s-1CA:\s0 however
|
|
it is allowed to be a \s-1CA\s0 to work around some broken software.
|
|
.PP
|
|
If the certificate is a V1 certificate (and thus has no extensions) and
|
|
it is self signed it is also assumed to be a \s-1CA\s0 but a warning is again
|
|
given: this is to work around the problem of Verisign roots which are V1
|
|
self signed certificates.
|
|
.PP
|
|
If the keyUsage extension is present then additional restraints are
|
|
made on the uses of the certificate. A \s-1CA\s0 certificate \fBmust\fR have the
|
|
keyCertSign bit set if the keyUsage extension is present.
|
|
.PP
|
|
The extended key usage extension places additional restrictions on the
|
|
certificate uses. If this extension is present (whether critical or not)
|
|
the key can only be used for the purposes specified.
|
|
.PP
|
|
A complete description of each test is given below. The comments about
|
|
basicConstraints and keyUsage and V1 certificates above apply to \fBall\fR
|
|
\&\s-1CA\s0 certificates.
|
|
.IP "\fB\s-1SSL\s0 Client\fR" 4
|
|
.IX Item "SSL Client"
|
|
The extended key usage extension must be absent or include the \*(L"web client
|
|
authentication\*(R" \s-1OID. \s0 keyUsage must be absent or it must have the
|
|
digitalSignature bit set. Netscape certificate type must be absent or it must
|
|
have the \s-1SSL\s0 client bit set.
|
|
.IP "\fB\s-1SSL\s0 Client \s-1CA\s0\fR" 4
|
|
.IX Item "SSL Client CA"
|
|
The extended key usage extension must be absent or include the \*(L"web client
|
|
authentication\*(R" \s-1OID.\s0 Netscape certificate type must be absent or it must have
|
|
the \s-1SSL CA\s0 bit set: this is used as a work around if the basicConstraints
|
|
extension is absent.
|
|
.IP "\fB\s-1SSL\s0 Server\fR" 4
|
|
.IX Item "SSL Server"
|
|
The extended key usage extension must be absent or include the \*(L"web server
|
|
authentication\*(R" and/or one of the \s-1SGC\s0 OIDs. keyUsage must be absent or it
|
|
must have the digitalSignature, the keyEncipherment set or both bits set.
|
|
Netscape certificate type must be absent or have the \s-1SSL\s0 server bit set.
|
|
.IP "\fB\s-1SSL\s0 Server \s-1CA\s0\fR" 4
|
|
.IX Item "SSL Server CA"
|
|
The extended key usage extension must be absent or include the \*(L"web server
|
|
authentication\*(R" and/or one of the \s-1SGC\s0 OIDs. Netscape certificate type must
|
|
be absent or the \s-1SSL CA\s0 bit must be set: this is used as a work around if the
|
|
basicConstraints extension is absent.
|
|
.IP "\fBNetscape \s-1SSL\s0 Server\fR" 4
|
|
.IX Item "Netscape SSL Server"
|
|
For Netscape \s-1SSL\s0 clients to connect to an \s-1SSL\s0 server it must have the
|
|
keyEncipherment bit set if the keyUsage extension is present. This isn't
|
|
always valid because some cipher suites use the key for digital signing.
|
|
Otherwise it is the same as a normal \s-1SSL\s0 server.
|
|
.IP "\fBCommon S/MIME Client Tests\fR" 4
|
|
.IX Item "Common S/MIME Client Tests"
|
|
The extended key usage extension must be absent or include the \*(L"email
|
|
protection\*(R" \s-1OID.\s0 Netscape certificate type must be absent or should have the
|
|
S/MIME bit set. If the S/MIME bit is not set in netscape certificate type
|
|
then the \s-1SSL\s0 client bit is tolerated as an alternative but a warning is shown:
|
|
this is because some Verisign certificates don't set the S/MIME bit.
|
|
.IP "\fBS/MIME Signing\fR" 4
|
|
.IX Item "S/MIME Signing"
|
|
In addition to the common S/MIME client tests the digitalSignature bit must
|
|
be set if the keyUsage extension is present.
|
|
.IP "\fBS/MIME Encryption\fR" 4
|
|
.IX Item "S/MIME Encryption"
|
|
In addition to the common S/MIME tests the keyEncipherment bit must be set
|
|
if the keyUsage extension is present.
|
|
.IP "\fBS/MIME \s-1CA\s0\fR" 4
|
|
.IX Item "S/MIME CA"
|
|
The extended key usage extension must be absent or include the \*(L"email
|
|
protection\*(R" \s-1OID.\s0 Netscape certificate type must be absent or must have the
|
|
S/MIME \s-1CA\s0 bit set: this is used as a work around if the basicConstraints
|
|
extension is absent.
|
|
.IP "\fB\s-1CRL\s0 Signing\fR" 4
|
|
.IX Item "CRL Signing"
|
|
The keyUsage extension must be absent or it must have the \s-1CRL\s0 signing bit
|
|
set.
|
|
.IP "\fB\s-1CRL\s0 Signing \s-1CA\s0\fR" 4
|
|
.IX Item "CRL Signing CA"
|
|
The normal \s-1CA\s0 tests apply. Except in this case the basicConstraints extension
|
|
must be present.
|
|
.SH "BUGS"
|
|
.IX Header "BUGS"
|
|
Extensions in certificates are not transferred to certificate requests and
|
|
vice versa.
|
|
.PP
|
|
It is possible to produce invalid certificates or requests by specifying the
|
|
wrong private key or using inconsistent options in some cases: these should
|
|
be checked.
|
|
.PP
|
|
There should be options to explicitly set such things as start and end
|
|
dates rather than an offset from the current time.
|
|
.PP
|
|
The code to implement the verify behaviour described in the \fB\s-1TRUST SETTINGS\s0\fR
|
|
is currently being developed. It thus describes the intended behaviour rather
|
|
than the current behaviour. It is hoped that it will represent reality in
|
|
OpenSSL 0.9.5 and later.
|
|
.SH "SEE ALSO"
|
|
.IX Header "SEE ALSO"
|
|
\&\fIreq\fR\|(1), \fIca\fR\|(1), \fIgenrsa\fR\|(1),
|
|
\&\fIgendsa\fR\|(1), \fIverify\fR\|(1),
|
|
\&\fIx509v3_config\fR\|(5)
|
|
.SH "HISTORY"
|
|
.IX Header "HISTORY"
|
|
Before OpenSSL 0.9.8, the default digest for \s-1RSA\s0 keys was \s-1MD5.\s0
|
|
.PP
|
|
The hash algorithm used in the \fB\-subject_hash\fR and \fB\-issuer_hash\fR options
|
|
before OpenSSL 1.0.0 was based on the deprecated \s-1MD5\s0 algorithm and the encoding
|
|
of the distinguished name. In OpenSSL 1.0.0 and later it is based on a
|
|
canonical version of the \s-1DN\s0 using \s-1SHA1.\s0 This means that any directories using
|
|
the old form must have their links rebuilt using \fBc_rehash\fR or similar.
|