147 lines
4.1 KiB
Plaintext
147 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, openssl-rehash,
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c_rehash, 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<crl(1)>.
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L<x509(1)>.
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=head1 COPYRIGHT
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Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (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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