thodg/acme-client/main.c

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• Hash : a1ac5fc5
  Author : Thomas de Grivel
  Date : 2025-09-13T20:19:29
  

  make Makefile portable and fix build using libbsd
  

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• main.c

• /*	$Id: main.c,v 1.56 2024/06/19 13:13:25 claudio 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 <sys/socket.h>
  
  #include <ctype.h>
  #include <err.h>
  #include <libgen.h>
  #include <locale.h>
  #include <signal.h>
  #include <stdarg.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <unistd.h>
  
  #include "extern.h"
  #include "parse.h"
  
  #define WWW_DIR "/var/www/acme"
  #define CONF_FILE "/etc/acme-client.conf"
  
  int		 verbose;
  enum comp 	 proccomp;
  
  int
  main(int argc, char *argv[])
  {
  	const char	 **alts = NULL;
  	char		 *certdir = NULL;
  	char		 *chngdir = NULL, *auth = NULL;
  	char		 *conffile = CONF_FILE;
  	char		 *tmps, *tmpsd;
  	int		  key_fds[2], acct_fds[2], chng_fds[2], cert_fds[2];
  	int		  file_fds[2], dns_fds[2], rvk_fds[2];
  	int		  force = 0;
  	int		  c, rc, revocate = 0;
  	int		  popts = 0;
  	pid_t		  pids[COMP__MAX];
  	size_t		  i, altsz, ne;
  
  	struct acme_conf	*conf = NULL;
  	struct authority_c	*authority = NULL;
  	struct domain_c		*domain = NULL;
  	struct altname_c	*ac;
  
  	if (setlocale(LC_CTYPE, "C") == NULL)
  		errx(1, "setlocale");
  
  	while ((c = getopt(argc, argv, "Fnrvf:")) != -1)
  		switch (c) {
  		case 'F':
  			force = 1;
  			break;
  		case 'f':
  			if ((conffile = strdup(optarg)) == NULL)
  				err(EXIT_FAILURE, "strdup");
  			break;
  		case 'n':
  			popts |= ACME_OPT_CHECK;
  			break;
  		case 'r':
  			revocate = 1;
  			break;
  		case 'v':
  			verbose = verbose ? 2 : 1;
  			popts |= ACME_OPT_VERBOSE;
  			break;
  		default:
  			goto usage;
  		}
  
  	if (getuid() != 0)
  		errx(EXIT_FAILURE, "must be run as root");
  
  	/* parse config file */
  	if ((conf = parse_config(conffile, popts)) == NULL)
  		return EXIT_FAILURE;
  
  	argc -= optind;
  	argv += optind;
  	if (argc != 1)
  		goto usage;
  
  	if ((domain = domain_find_handle(conf, argv[0])) == NULL)
  		errx(EXIT_FAILURE, "domain %s not found", argv[0]);
  
  	argc--;
  	argv++;
  
  	/*
  	 * The parser enforces that at least cert or fullchain is set.
  	 * XXX Test if cert, chain and fullchain have the same dirname?
  	 */
  	tmps = domain->cert ? domain->cert : domain->fullchain;
  	if ((tmps = strdup(tmps)) == NULL)
  		err(EXIT_FAILURE, "strdup");
  	if ((tmpsd = dirname(tmps)) == NULL)
  		err(EXIT_FAILURE, "dirname");
  	if ((certdir = strdup(tmpsd)) == NULL)
  		err(EXIT_FAILURE, "strdup");	
  	free(tmps);
  	tmps = tmpsd = NULL;
  
  
  	/* chain or fullchain can be relative paths according */
  	if (domain->chain && domain->chain[0] != '/') {
  		if (asprintf(&tmps, "%s/%s", certdir, domain->chain) == -1)
  			err(EXIT_FAILURE, "asprintf");
  		free(domain->chain);
  		domain->chain = tmps;
  		tmps = NULL;
  	}
  	if (domain->fullchain && domain->fullchain[0] != '/') {
  		if (asprintf(&tmps, "%s/%s", certdir, domain->fullchain) == -1)
  			err(EXIT_FAILURE, "asprintf");
  		free(domain->fullchain);
  		domain->fullchain = tmps;
  		tmps = NULL;
  	}
  
  	if ((auth = domain->auth) == NULL) {
  		/* use the first authority from the config as default XXX */
  		authority = authority_find0(conf);
  		if (authority == NULL)
  			errx(EXIT_FAILURE, "no authorities configured");
  	} else {
  		authority = authority_find(conf, auth);
  		if (authority == NULL)
  			errx(EXIT_FAILURE, "authority %s not found", auth);
  	}
  
  	if ((chngdir = domain->challengedir) == NULL)
  		if ((chngdir = strdup(WWW_DIR)) == NULL)
  			err(EXIT_FAILURE, "strdup");
  
  	/*
  	 * Do some quick checks to see if our paths exist.
  	 * This will be done in the children, but we might as well check
  	 * now before the fork.
  	 * XXX maybe use conf_check_file() from parse.y
  	 */
  
  	ne = 0;
  
  	if (access(certdir, R_OK) == -1) {
  		warnx("%s: cert directory must exist", certdir);
  		ne++;
  	}
  
  	if (access(chngdir, R_OK) == -1) {
  		warnx("%s: challenge directory must exist", chngdir);
  		ne++;
  	}
  
  	if (ne > 0)
  		return EXIT_FAILURE;
  
  	if (popts & ACME_OPT_CHECK)
  		return EXIT_SUCCESS;
  
  	/* Set the zeroth altname as our domain. */
  	altsz = domain->altname_count + 1;
  	alts = calloc(altsz, sizeof(char *));
  	if (alts == NULL)
  		err(EXIT_FAILURE, "calloc");
  	alts[0] = domain->domain;
  	i = 1;
  	/* XXX get rid of alts[] later */
  	TAILQ_FOREACH(ac, &domain->altname_list, entry)
  		alts[i++] = ac->domain;
  
  	/*
  	 * Open channels between our components.
  	 */
  
  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, key_fds) == -1)
  		err(EXIT_FAILURE, "socketpair");
  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, acct_fds) == -1)
  		err(EXIT_FAILURE, "socketpair");
  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, chng_fds) == -1)
  		err(EXIT_FAILURE, "socketpair");
  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, cert_fds) == -1)
  		err(EXIT_FAILURE, "socketpair");
  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, file_fds) == -1)
  		err(EXIT_FAILURE, "socketpair");
  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, dns_fds) == -1)
  		err(EXIT_FAILURE, "socketpair");
  	if (socketpair(AF_UNIX, SOCK_STREAM, 0, rvk_fds) == -1)
  		err(EXIT_FAILURE, "socketpair");
  
  	signal(SIGPIPE, SIG_IGN);
  
  	/* Start with the network-touching process. */
  
  	if ((pids[COMP_NET] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_NET] == 0) {
  		proccomp = COMP_NET;
  		close(key_fds[0]);
  		close(acct_fds[0]);
  		close(chng_fds[0]);
  		close(cert_fds[0]);
  		close(file_fds[0]);
  		close(file_fds[1]);
  		close(dns_fds[0]);
  		close(rvk_fds[0]);
  		c = netproc(key_fds[1], acct_fds[1],
  		    chng_fds[1], cert_fds[1],
  		    dns_fds[1], rvk_fds[1],
  		    revocate, authority,
  		    (const char *const *)alts, altsz);
  		exit(c ? EXIT_SUCCESS : EXIT_FAILURE);
  	}
  
  	close(key_fds[1]);
  	close(acct_fds[1]);
  	close(chng_fds[1]);
  	close(cert_fds[1]);
  	close(dns_fds[1]);
  	close(rvk_fds[1]);
  
  	/* Now the key-touching component. */
  
  	if ((pids[COMP_KEY] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_KEY] == 0) {
  		proccomp = COMP_KEY;
  		close(cert_fds[0]);
  		close(dns_fds[0]);
  		close(rvk_fds[0]);
  		close(acct_fds[0]);
  		close(chng_fds[0]);
  		close(file_fds[0]);
  		close(file_fds[1]);
  		c = keyproc(key_fds[0], domain->key,
  		    (const char **)alts, altsz,
  		    domain->keytype);
  		exit(c ? EXIT_SUCCESS : EXIT_FAILURE);
  	}
  
  	close(key_fds[0]);
  
  	/* The account-touching component. */
  
  	if ((pids[COMP_ACCOUNT] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_ACCOUNT] == 0) {
  		proccomp = COMP_ACCOUNT;
  		close(cert_fds[0]);
  		close(dns_fds[0]);
  		close(rvk_fds[0]);
  		close(chng_fds[0]);
  		close(file_fds[0]);
  		close(file_fds[1]);
  		c = acctproc(acct_fds[0], authority->account,
  		    authority->keytype);
  		exit(c ? EXIT_SUCCESS : EXIT_FAILURE);
  	}
  
  	close(acct_fds[0]);
  
  	/* The challenge-accepting component. */
  
  	if ((pids[COMP_CHALLENGE] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_CHALLENGE] == 0) {
  		proccomp = COMP_CHALLENGE;
  		close(cert_fds[0]);
  		close(dns_fds[0]);
  		close(rvk_fds[0]);
  		close(file_fds[0]);
  		close(file_fds[1]);
  		c = chngproc(chng_fds[0], chngdir);
  		exit(c ? EXIT_SUCCESS : EXIT_FAILURE);
  	}
  
  	close(chng_fds[0]);
  
  	/* The certificate-handling component. */
  
  	if ((pids[COMP_CERT] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_CERT] == 0) {
  		proccomp = COMP_CERT;
  		close(dns_fds[0]);
  		close(rvk_fds[0]);
  		close(file_fds[1]);
  		c = certproc(cert_fds[0], file_fds[0]);
  		exit(c ? EXIT_SUCCESS : EXIT_FAILURE);
  	}
  
  	close(cert_fds[0]);
  	close(file_fds[0]);
  
  	/* The certificate-handling component. */
  
  	if ((pids[COMP_FILE] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_FILE] == 0) {
  		proccomp = COMP_FILE;
  		close(dns_fds[0]);
  		close(rvk_fds[0]);
  		c = fileproc(file_fds[1], certdir, domain->cert, domain->chain,
  		    domain->fullchain);
  		/*
  		 * This is different from the other processes in that it
  		 * can return 2 if the certificates were updated.
  		 */
  		exit(c > 1 ? 2 : (c ? EXIT_SUCCESS : EXIT_FAILURE));
  	}
  
  	close(file_fds[1]);
  
  	/* The DNS lookup component. */
  
  	if ((pids[COMP_DNS] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_DNS] == 0) {
  		proccomp = COMP_DNS;
  		close(rvk_fds[0]);
  		c = dnsproc(dns_fds[0]);
  		exit(c ? EXIT_SUCCESS : EXIT_FAILURE);
  	}
  
  	close(dns_fds[0]);
  
  	/* The expiration component. */
  
  	if ((pids[COMP_REVOKE] = fork()) == -1)
  		err(EXIT_FAILURE, "fork");
  
  	if (pids[COMP_REVOKE] == 0) {
  		proccomp = COMP_REVOKE;
  		c = revokeproc(rvk_fds[0], domain->cert != NULL ? domain->cert :
  		    domain->fullchain, force, revocate,
  		    (const char *const *)alts, altsz);
  		exit(c ? EXIT_SUCCESS : EXIT_FAILURE);
  	}
  
  	close(rvk_fds[0]);
  
  #if defined(__OpenBSD__)
  	/* Jail: sandbox, file-system, user. */
  
  	if (pledge("stdio", NULL) == -1)
  		err(EXIT_FAILURE, "pledge");
  #endif
  	/*
  	 * Collect our subprocesses.
  	 * Require that they both have exited cleanly.
  	 */
  
  	rc = checkexit(pids[COMP_KEY], COMP_KEY) +
  	    checkexit(pids[COMP_CERT], COMP_CERT) +
  	    checkexit(pids[COMP_NET], COMP_NET) +
  	    checkexit_ext(&c, pids[COMP_FILE], COMP_FILE) +
  	    checkexit(pids[COMP_ACCOUNT], COMP_ACCOUNT) +
  	    checkexit(pids[COMP_CHALLENGE], COMP_CHALLENGE) +
  	    checkexit(pids[COMP_DNS], COMP_DNS) +
  	    checkexit(pids[COMP_REVOKE], COMP_REVOKE);
  
  	return rc != COMP__MAX ? EXIT_FAILURE : (c == 2 ? EXIT_SUCCESS : 2);
  usage:
  	fprintf(stderr,
  	    "usage: acme-client [-Fnrv] [-f configfile] handle\n");
  	return EXIT_FAILURE;
  }
  

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