Provided by: uacme_1.7.1-1_amd64 
NAME
uacme - ACMEv2 client written in plain C with minimal dependencies
SYNOPSIS
uacme [-a|--acme-url URL] [-b|--bits BITS] [-c|--confdir DIR] [-d|--days DAYS] [-e|--eab
KEYID:KEY] [-f|--force] [-h|--hook PROGRAM] [-l|--alternate N | FP] [-m|--must-staple]
[-n|--never-create] [-o|--no-ocsp] [-s|--staging] [-t|--type RSA|EC] [-v|--verbose ...]
[-V|--version] [-y|--yes] [-?|--help] new [EMAIL] | update [EMAIL] | deactivate | newkey |
issue IDENTIFIER [ALTNAME ...]] | issue CSRFILE | revoke CERTFILE [CERTKEYFILE]
DESCRIPTION
uacme is a client for the ACMEv2 protocol described in RFC8555, written in plain C with
minimal dependencies (libcurl and one of GnuTLS, OpenSSL or mbedTLS). The ACMEv2 protocol
allows a Certificate Authority (https://letsencrypt.org is a popular one) and an applicant
to automate the process of verification and certificate issuance. The protocol also
provides facilities for other certificate management functions, such as certificate
revocation. For more information see https://tools.ietf.org/html/rfc8555
OPTIONS
-a, --acme-url URL
ACMEv2 server directory object URL. If not specified uacme uses one of the following:
https://acme-v02.api.letsencrypt.org/directory
production URL
https://acme-staging-v02.api.letsencrypt.org/directory
staging URL (see -s, --staging below)
-b, --bits BITS
key bit length (default 2048 for RSA, 256 for EC). Only applies to newly generated
keys. RSA key length must be a multiple of 8 between 2048 and 8192. EC key length must
be either 256 (NID_X9_62_prime256v1 curve) or 384 (NID_secp384r1 curve).
-c, --confdir CONFDIR
Use configuration directory CONFDIR (default /etc/ssl/uacme). The structure is as
follows (multiple IDENTIFIERs allowed)
CONFDIR/private/key.pem
ACME account private key
CONFDIR/private/IDENTIFIER/key.pem
certificate key for IDENTIFIER
CONFDIR/IDENTIFIER/cert.pem
certificate for IDENTIFIER
-d, --days DAYS
Do not reissue certificates that are still valid for longer than DAYS (default 30).
See also -o, --no-ocsp.
-e, --eab KEYID:KEY
Specify RFC8555 External Account Binding credentials according to
https://tools.ietf.org/html/rfc8555#section-7.3.4, in order to associate a new ACME
account with an existing account in a non-ACME system such as a CA customer database.
KEYID must be an ASCII string. KEY must be base64url-encoded.
-f, --force
Force certificate reissuance regardless of expiration date.
-h, --hook PROGRAM
Challenge hook program. If not specified uacme interacts with the user for every ACME
challenge, printing information about the challenge type, token and authorization on
stderr. If specified uacme executes PROGRAM (a binary, a shell script or any file that
can be executed by the operating system) for every challenge with the following 5
string arguments:
METHOD
one of begin, done or failed.
begin
is called at the beginning of the challenge. PROGRAM must return 0 to accept
it. Any other return code declines the challenge. Neither done nor failed
method calls are made for declined challenges.
done
is called upon successful completion of an accepted challenge.
failed
is called upon failure of an accepted challenge.
TYPE
challenge type (dns-01, http-01 or tls-alpn-01)
IDENT
The identifier the challenge refers to
TOKEN
The challenge token
AUTH
The key authorization (for dns-01 and tls-alpn-01 already converted to the
base64url-encoded SHA256 digest format)
-l, --alternate N | FP
According to https://tools.ietf.org/html/rfc8555#section-7.4.2 the server MAY provide
one or more additional certificate download URLs, each pointing to alternative
certificate chains starting with the same end-entity certificate. This option allows
selecting one such chain in one of two ways. A positive integer N makes uacme select
the Nth alternative chain in the order presented by the server. A colon (:) separated
list of two or more 2-digit hexadecimal numbers FP makes uacme select the first
alternative chain containing a certificate whose SHA256 fingerprint begins with FP. In
both cases uacme falls back to the main certificate URL if it cannot match an
alternative chain or the download thereof fails.
-m, --must-staple
Request certificates with the RFC7633 Certificate Status Request TLS Feature
Extension, informally also known as "OCSP Must-Staple". This option is ignored when
using an externally supplied Certificate Signing Request file (see USAGE below).
-n, --never-create
By default uacme creates directories/keys if they do not exist. When this option is
specified uacme never does so and instead exits with an error if anything required is
missing.
-o, --no-ocsp
When this flag is not specified and the certificate has an Authority Information
Access extension with an OCSP server location according to
https://tools.ietf.org/html/rfc5280#section-4.2.2.1 uacme makes an OCSP request to the
server; if the certificate is reported as revoked uacme forces reissuance regardless
of the expiration date. See also -d, --days.
-s, --staging
Use Let’s Encrypt staging URL for testing. This only works if -a, --acme-url is NOT
specified.
-t, --type=RSA | EC
Key type, either RSA or EC. Only applies to newly generated keys. The bit length can
be specified with -b, --bits.
-v, --verbose
By default uacme only produces output upon errors or when user interaction is
required. When this option is specified uacme prints information about what is going
on on stderr. This option can be specified more than once to increase verbosity.
-V, --version
Print program version on stderr and exit.
-y, --yes
Autoaccept ACME server terms (if any) upon new account creation.
-?, --help
Print a brief usage text on stderr and exit.
USAGE
uacme [OPTIONS ...] new [EMAIL]
Create a new ACME account with optional EMAIL contact. If the account private key does
not exist at CONFDIR/private/key.pem a new key is generated unless -n, --never-create
is specified. A valid account must be created before any other operation can succeed
(with the exception of certificate revocation requests signed by the certificate
private key). Any certificate issued by the ACME server is associated with a single
account. An account can be associated with multiple certificates, subject of course to
the rate limits imposed by the ACME server.
uacme [OPTIONS ...] update [EMAIL]
Update the EMAIL associated with the ACME account corresponding to the account private
key. If EMAIL is not specified the account contact email is removed.
uacme [OPTIONS ...] deactivate
Deactivate the ACME account corresponding to the account private key. WARNING this
action is irreversible. Users may wish to do this when the account key is compromised
or decommissioned. A deactivated account can no longer request certificate issuances
and revocations or access resources related to the account.
uacme [OPTIONS ...] newkey
Change the ACME account private key. If the new account private key does not exist at
CONFDIR/private/newkey.pem it is generated unless -n, --never-create is specified. The
new key is then submitted to the server and if the operation succeeds the old key is
hardlinked to CONFDIR/private/key-TIMESTAMP.pem before renaming
CONFDIR/private/newkey.pem to CONFDIR/private/key.pem.
uacme [OPTIONS ...] issue IDENTIFIER [ALTNAME ...]
Issue a certificate for IDENTIFIER with zero or more ALTNAMEs. If a certificate is
already available at CONFDIR/IDENTIFIER/cert.pem for the specified IDENTIFIER and
ALTNAMEs and is still valid for longer than DAYS no action is taken unless -f, --force
is specified or -o, --no-ocsp is not specified and the certificate is reported as
revoked by the OCSP server. The new certificate is saved to
CONFDIR/IDENTIFIER/cert.pem. If the certificate file already exists it is hardlinked
to CONFDIR/IDENTIFIER/cert-TIMESTAMP.pem before overwriting. The private key for the
certificate is loaded from CONFDIR/private/IDENTIFIER/key.pem. If no such file exists,
a new key is generated unless -n, --never-create is specified. Wildcard IDENTIFIERs or
ALTNAMEs are dealt with correctly, as long as the ACME server supports them; note that
any such wildcards are automatically removed from the configuration subdirectory name:
for example a certificate for *.test.com is saved to CONFDIR/test.com/cert.pem. IP
address IDENTIFIERs and ALTNAMEs are also supported according to
https://tools.ietf.org/html/rfc8738#section-3
uacme [OPTIONS ...] issue CSRFILE
Issue a certificate based on a RFC2986 Certificate Signing Request contained in
CSRFILE, which must be in PEM format. In this mode of issuance uacme neither needs nor
generates the certificate private key, but it is of course the responsibility of the
user to ensure that the CSR is constructed and signed appropriately. If a certificate
file CSRBASE-cert.pem (where CSRBASE is obtained by stripping the extension, if any,
from CSRFILE) is already available in the same directory containing CSRFILE, and is
still valid for longer than DAYS no action is taken unless -f, --force is specified or
-o, --no-ocsp is not specified and the certificate is reported as revoked by the OCSP
server. If the certificate file already exists it is hardlinked to
BASENAME-cert-TIMESTAMP.pem before overwriting. Wildcard identifiers in the CSR are
dealt with correctly, as long as the ACME server supports them. IP addresses are also
supported according to https://tools.ietf.org/html/rfc8738#section-3
uacme [OPTIONS ...] revoke CERTFILE [CERTKEYFILE]
Revoke the certificate stored in CERTFILE. The revocation request is signed with the
private key of either the certificate, when CERTKEYFILE is specified; or the ACME
account associated with the certificate, when only CERTFILE is specified. In the first
instance the account key and the configuration directory are not required. If
successful CERTFILE is renamed to revoked-TIMESTAMP.pem.
EXIT STATUS
0
Success
1
Certificate not reissued because it is still current
2
Failure (syntax or usage error; configuration error; processing failure; unexpected
error).
EXAMPLE HOOK SCRIPT
The uacme.sh hook script included in the distribution can be used to automate the
certificate issuance with http-01 challenges, provided a web server for the domain being
validated runs on the same machine, with webroot at /var/www
#!/bin/sh
CHALLENGE_PATH=/var/www/.well-known/acme-challenge
ARGS=5
E_BADARGS=85
if test $# -ne "$ARGS"
then
echo "Usage: $(basename "$0") method type ident token auth" 1>&2
exit $E_BADARGS
fi
METHOD=$1
TYPE=$2
IDENT=$3
TOKEN=$4
AUTH=$5
case "$METHOD" in
"begin")
case "$TYPE" in
http-01)
echo -n "${AUTH}" > "${CHALLENGE_PATH}/${TOKEN}"
exit $?
;;
*)
exit 1
;;
esac
;;
"done"|"failed")
case "$TYPE" in
http-01)
rm "${CHALLENGE_PATH}/${TOKEN}"
exit $?
;;
*)
exit 1
;;
esac
;;
*)
echo "$0: invalid method" 1>&2
exit 1
esac
BUGS
If you believe you have found a bug, please create a new issue at
https://github.com/ndilieto/uacme/issues with any applicable information.
SEE ALSO
ualpn(1)
AUTHOR
uacme was written by Nicola Di Lieto
COPYRIGHT
Copyright © 2019-2021 Nicola Di Lieto <nicola.dilieto@gmail.com>
This file is part of uacme.
uacme is free software: you can redistribute it and/or modify it under the terms of the
GNU General Public License as published by the Free Software Foundation, either version 3
of the License, or (at your option) any later version.
uacme is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program.
If not, see http://www.gnu.org/licenses/.