NAME¶
c_rehash - Create symbolic links to files named by the hash values
SYNOPSIS¶
c_rehash [
directory...]
DESCRIPTION¶
c_rehash scans directories and calculates a hash value of each
".pem" file in the specified directory list and creates symbolic
links for each file, where the name of the link is the hash value. This
utility is useful as many programs that use OpenSSL require directories to be
set up like this in order to find certificates.
If any directories are named on the command line, then those are processed in
turn. If not, then the
SSL_CERT_DIR environment variable is consulted;
this shold be a colon-separated list of directories, like the Unix
PATH
variable. If that is not set then the default directory (installation-specific
but often
/usr/local/ssl/certs) is processed.
In order for a directory to be processed, the user must have write permissions
on that directory, otherwise it will be skipped. The links created are of the
form "HHHHHHHH.D", where each
H is a hexadecimal character
and
D is a single decimal digit. When processing a directory,
c_rehash will first remove all links that have a name in that syntax.
If you have links in that format used for other purposes, they will be
removed. Hashes for CRL's look similar except the letter
r appears
after the period, like this: "HHHHHHHH.rD".
Multiple objects may have the same hash; they will be indicated by incrementing
the
D value. Duplicates are found by comparing the full SHA-1
fingerprint. A warning will be displayed if a duplicate is found.
A warning will also be displayed if there are
.pem files that cannot be
parsed as either a certificate or a CRL.
The program uses the
openssl program to compute the hashes and
fingerprints. If not found in the user's
PATH, then set the
OPENSSL environment variable to the full pathname. Any program can be
used, it will be invoked as follows for either a certificate or CRL:
$OPENSSL x509 -hash -fingerprint -noout -in FFFFFF
$OPENSSL crl -hash -fingerprint -noout -in FFFFFF
where
FFFFFF is the filename. It must output the hash of the file on the
first line, and the fingerprint on the second, optionally prefixed with some
text and an equals sign.
ENVIRONMENT¶
- OPENSSL
- The path to 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.
SEE ALSO¶
openssl(1),
crl(1).
x509(1).