c_rehash(1ssl) - phpMan

C_REHASH(1SSL) OpenSSL C_REHASH(1SSL)

NAME
c_rehash - Create symbolic links to files named by the hash values

SYNOPSIS
c_rehash [directory] ...

DESCRIPTION
c_rehash scans directories and takes a hash value of each .pem and .crt file in the
directory. It then creates symbolic links for each of the files named by the hash value.
This is useful as many programs require directories to be set up like this in order to
find the certificates they require.

If any directories are named on the command line then these directories are processed in
turn. If not then and the environment variable SSL_CERT_DIR is defined then that is
consulted. This variable should be a colon (:) separated list of directories, all of which
will be processed. If neither of these conditions are true then /usr/lib/ssl/certs is
processed.

For each directory that is to be processed he user must have write permissions on the
directory, if they do not then nothing will be printed for that directory.

Note that this program deletes all the symbolic links that look like ones that it creates
before processing a directory. Beware that if you run the program on a directory that
contains symbolic links for other purposes that are named in the same format as those
created by this program they will be lost.

The hashes for certificate files are of the form <hash>.<n> where n is an integer. If the
hash value already exists then n will be incremented, unless the file is a duplicate.
Duplicates are detected using the fingerprint of the certificate. A warning will be
printed if a duplicate is detected. The hashes for CRL files are of the form <hash>.r<n>
and have the same behavior.

The program will also warn if there are files with extension .pem which are not
certificate or CRL files.

The program uses the openssl program to compute the hashes and fingerprints. It expects
the executable to be named openssl and be on the PATH, or in the /usr/lib/ssl/bin
directory. If the OPENSSL environment variable is defined then this is used instead as the
executable that provides the hashes and fingerprints. When called as $OPENSSL x509 -hash
-fingerprint -noout -in $file it must output the hash of $file on the first line followed
by the fingerprint on the second line, optionally prefixed with some text and an equals
sign (=).

OPTIONS
None

ENVIRONMENT
OPENSSL
The name (and path) of an executable to use to generate hashes and fingerprints (see
above).

SSL_CERT_DIR
Colon separated list of directories to operate on. Ignored if directories are listed
on the command line.