IABSD.fr/src/usr.sbin/acme-client/certproc.c

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• Author : florian
  Date : 2019-06-07 08:07:52
  Hash : 7b00f4e9
  Message : Implement RFC 8555 "Automatic Certificate Management Environment (ACME)" to be able to talk to the v02 Let's Encrypt API. With this acme-client(1) will no longer be able to talk to the v01 API. Users must change the api url in /etc/acme-client.conf to https://acme-v02.api.letsencrypt.org/directory Existing accounts (and certs of course) stay valid and after the url change acme-client will be able to renew certs. Tested by Renaud Allard and benno Input & OK benno

• usr.sbin/acme-client/certproc.c

• /*	$Id: certproc.c,v 1.12 2019/06/07 08:07:52 florian Exp $ */
  /*
   * Copyright (c) 2016 Kristaps Dzonsons <kristaps@bsd.lv>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <err.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include <openssl/pem.h>
  #include <openssl/x509.h>
  #include <openssl/x509v3.h>
  #include <openssl/err.h>
  
  #include "extern.h"
  
  #define MARKER "-----END CERTIFICATE-----\n"
  
  int
  certproc(int netsock, int filesock)
  {
  	char		*csr = NULL, *chain = NULL, *url = NULL;
  	char		*chaincp;
  	size_t		 csrsz, chainsz;
  	int		 rc = 0, cc;
  	enum certop	 op;
  	long		 lval;
  
  	if (pledge("stdio", NULL) == -1) {
  		warn("pledge");
  		goto out;
  	}
  
  	/* Read what the netproc wants us to do. */
  
  	op = CERT__MAX;
  	if ((lval = readop(netsock, COMM_CSR_OP)) == 0)
  		op = CERT_STOP;
  	else if (lval == CERT_REVOKE || lval == CERT_UPDATE)
  		op = lval;
  
  	if (CERT_STOP == op) {
  		rc = 1;
  		goto out;
  	} else if (CERT__MAX == op) {
  		warnx("unknown operation from netproc");
  		goto out;
  	}
  
  	/*
  	 * Pass revocation right through to fileproc.
  	 * If the reader is terminated, ignore it.
  	 */
  
  	if (CERT_REVOKE == op) {
  		if (writeop(filesock, COMM_CHAIN_OP, FILE_REMOVE) >= 0)
  			rc = 1;
  		goto out;
  	}
  
  	/*
  	 * Wait until we receive the DER encoded (signed) certificate
  	 * from the network process.
  	 * Then convert the DER encoding into an X509 certificate.
  	 */
  
  	if ((csr = readbuf(netsock, COMM_CSR, &csrsz)) == NULL)
  		goto out;
  
  	if (csrsz < strlen(MARKER)) {
  		warnx("invalid cert");
  		goto out;
  	}
  
  	chaincp = strstr(csr, MARKER);
  
  	if (chaincp == NULL) {
  		warnx("invalid cert");
  		goto out;
  	}
  
  	chaincp += strlen(MARKER);
  	if ((chain = strdup(chaincp)) == NULL) {
  		warn("strdup");
  		goto out;
  	}
  
  	*chaincp = '\0';
  	chainsz = strlen(chain);
  	csrsz = strlen(csr);
  
  	/* Allow reader termination to just push us out. */
  
  	if ((cc = writeop(filesock, COMM_CHAIN_OP, FILE_CREATE)) == 0)
  		rc = 1;
  	if (cc <= 0)
  		goto out;
  	if ((cc = writebuf(filesock, COMM_CHAIN, chain, chainsz)) == 0)
  		rc = 1;
  	if (cc <= 0)
  		goto out;
  
  	if (writebuf(filesock, COMM_CSR, csr, csrsz) < 0)
  		goto out;
  
  	rc = 1;
  out:
  	close(netsock);
  	close(filesock);
  	free(csr);
  	free(url);
  	free(chain);
  	return rc;
  }