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Initially, the manual page entry for the 'openssl cmd' command used to be available at 'cmd(1)'. Later, the aliases 'openssl-cmd(1)' was introduced, which made it easier to group the openssl commands using the 'apropos(1)' command or the shell's tab completion. In order to reduce cluttering of the global manual page namespace, the manual page entries without the 'openssl-' prefix have been deprecated in OpenSSL 3.0 and will be removed in OpenSSL 4.0. Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/9666)
146 lines
4.1 KiB
Plaintext
146 lines
4.1 KiB
Plaintext
=pod
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=for comment
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Original text by James Westby, contributed under the OpenSSL license.
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=head1 NAME
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openssl-c_rehash - Create symbolic links to files named by the hash values
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=head1 SYNOPSIS
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B<openssl>
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B<rehash>
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B<[-h]>
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B<[-help]>
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B<[-old]>
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B<[-n]>
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B<[-v]>
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[ I<directory>...]
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B<c_rehash>
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I<flags...>
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=head1 DESCRIPTION
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On some platforms, the OpenSSL B<rehash> command is available as
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an external script called B<c_rehash>. They are functionally equivalent,
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except for minor differences noted below.
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B<rehash> scans directories and calculates a hash value of each
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C<.pem>, C<.crt>, C<.cer>, or C<.crl>
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file in the specified directory list and creates symbolic links
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for each file, where the name of the link is the hash value.
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(If the platform does not support symbolic links, a copy is made.)
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This utility is useful as many programs that use OpenSSL require
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directories to be set up like this in order to find certificates.
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If any directories are named on the command line, then those are
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processed in turn. If not, then the B<SSL_CERT_DIR> environment variable
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is consulted; this should be a colon-separated list of directories,
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like the Unix B<PATH> variable.
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If that is not set then the default directory (installation-specific
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but often B</usr/local/ssl/certs>) is processed.
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In order for a directory to be processed, the user must have write
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permissions on that directory, otherwise an error will be generated.
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The links created are of the form C<HHHHHHHH.D>, where each B<H>
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is a hexadecimal character and B<D> is a single decimal digit.
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When processing a directory, B<rehash> will first remove all links
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that have a name in that syntax, even if they are being used for some
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other purpose.
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To skip the removal step, use the B<-n> flag.
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Hashes for CRL's look similar except the letter B<r> appears after
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the period, like this: C<HHHHHHHH.rD>.
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Multiple objects may have the same hash; they will be indicated by
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incrementing the B<D> value. Duplicates are found by comparing the
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full SHA-1 fingerprint. A warning will be displayed if a duplicate
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is found.
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A warning will also be displayed if there are files that
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cannot be parsed as either a certificate or a CRL or if
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more than one such object appears in the file.
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=head2 Script Configuration
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The B<c_rehash> script
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uses the B<openssl> program to compute the hashes and
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fingerprints. If not found in the user's B<PATH>, then set the
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B<OPENSSL> environment variable to the full pathname.
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Any program can be used, it will be invoked as follows for either
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a certificate or CRL:
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$OPENSSL x509 -hash -fingerprint -noout -in FILENAME
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$OPENSSL crl -hash -fingerprint -noout -in FILENAME
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where B<FILENAME> is the filename. It must output the hash of the
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file on the first line, and the fingerprint on the second,
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optionally prefixed with some text and an equals sign.
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=head1 OPTIONS
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=over 4
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=item B<-help> B<-h>
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Display a brief usage message.
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=item B<-old>
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Use old-style hashing (MD5, as opposed to SHA-1) for generating
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links to be used for releases before 1.0.0.
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Note that current versions will not use the old style.
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=item B<-n>
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Do not remove existing links.
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This is needed when keeping new and old-style links in the same directory.
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=item B<-compat>
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Generate links for both old-style (MD5) and new-style (SHA1) hashing.
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This allows releases before 1.0.0 to use these links along-side newer
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releases.
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=item B<-v>
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Print messages about old links removed and new links created.
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By default, B<rehash> only lists each directory as it is processed.
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=back
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=head1 ENVIRONMENT
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=over 4
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=item B<OPENSSL>
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The path to an executable to use to generate hashes and
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fingerprints (see above).
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=item B<SSL_CERT_DIR>
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Colon separated list of directories to operate on.
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Ignored if directories are listed on the command line.
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=back
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=head1 SEE ALSO
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L<openssl(1)>,
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L<openssl-crl(1)>,
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L<openssl-x509(1)>
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=head1 COPYRIGHT
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Copyright 2015-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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