pkg.c revision 287147 
1/*-
2 * Copyright (c) 2012-2014 Baptiste Daroussin <bapt@FreeBSD.org>
3 * Copyright (c) 2013 Bryan Drewery <bdrewery@FreeBSD.org>
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25 * SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD: releng/9.3/usr.sbin/pkg/pkg.c 287147 2015-08-25 20:49:05Z delphij $");
30
31#include <sys/param.h>
32#include <sys/queue.h>
33#include <sys/types.h>
34#include <sys/sbuf.h>
35#include <sys/wait.h>
36
37#define _WITH_GETLINE
38#include <archive.h>
39#include <archive_entry.h>
40#include <dirent.h>
41#include <err.h>
42#include <errno.h>
43#include <fcntl.h>
44#include <fetch.h>
45#include <paths.h>
46#include <stdbool.h>
47#include <stdlib.h>
48#include <stdio.h>
49#include <string.h>
50#include <time.h>
51#include <unistd.h>
52#include <ucl.h>
53
54#include <openssl/err.h>
55#include <openssl/ssl.h>
56
57#include "dns_utils.h"
58#include "config.h"
59
60struct sig_cert {
61	char *name;
62	unsigned char *sig;
63	int siglen;
64	unsigned char *cert;
65	int certlen;
66	bool trusted;
67};
68
69typedef enum {
70       HASH_UNKNOWN,
71       HASH_SHA256,
72} hash_t;
73
74struct fingerprint {
75       hash_t type;
76       char *name;
77       char hash[BUFSIZ];
78       STAILQ_ENTRY(fingerprint) next;
79};
80
81STAILQ_HEAD(fingerprint_list, fingerprint);
82
83static int
84extract_pkg_static(int fd, char *p, int sz)
85{
86	struct archive *a;
87	struct archive_entry *ae;
88	char *end;
89	int ret, r;
90
91	ret = -1;
92	a = archive_read_new();
93	if (a == NULL) {
94		warn("archive_read_new");
95		return (ret);
96	}
97	archive_read_support_compression_all(a);
98	archive_read_support_format_tar(a);
99
100	if (lseek(fd, 0, 0) == -1) {
101		warn("lseek");
102		goto cleanup;
103	}
104
105	if (archive_read_open_fd(a, fd, 4096) != ARCHIVE_OK) {
106		warnx("archive_read_open_fd: %s", archive_error_string(a));
107		goto cleanup;
108	}
109
110	ae = NULL;
111	while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK) {
112		end = strrchr(archive_entry_pathname(ae), '/');
113		if (end == NULL)
114			continue;
115
116		if (strcmp(end, "/pkg-static") == 0) {
117			r = archive_read_extract(a, ae,
118			    ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM |
119			    ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_ACL |
120			    ARCHIVE_EXTRACT_FFLAGS | ARCHIVE_EXTRACT_XATTR);
121			strlcpy(p, archive_entry_pathname(ae), sz);
122			break;
123		}
124	}
125
126	if (r == ARCHIVE_OK)
127		ret = 0;
128	else
129		warnx("fail to extract pkg-static");
130
131cleanup:
132	archive_read_free(a);
133	return (ret);
134
135}
136
137static int
138install_pkg_static(const char *path, const char *pkgpath, bool force)
139{
140	int pstat;
141	pid_t pid;
142
143	switch ((pid = fork())) {
144	case -1:
145		return (-1);
146	case 0:
147		if (force)
148			execl(path, "pkg-static", "add", "-f", pkgpath,
149			    (char *)NULL);
150		else
151			execl(path, "pkg-static", "add", pkgpath,
152			    (char *)NULL);
153		_exit(1);
154	default:
155		break;
156	}
157
158	while (waitpid(pid, &pstat, 0) == -1)
159		if (errno != EINTR)
160			return (-1);
161
162	if (WEXITSTATUS(pstat))
163		return (WEXITSTATUS(pstat));
164	else if (WIFSIGNALED(pstat))
165		return (128 & (WTERMSIG(pstat)));
166	return (pstat);
167}
168
169static int
170fetch_to_fd(const char *url, char *path)
171{
172	struct url *u;
173	struct dns_srvinfo *mirrors, *current;
174	struct url_stat st;
175	FILE *remote;
176	/* To store _https._tcp. + hostname + \0 */
177	int fd;
178	int retry, max_retry;
179	off_t done, r;
180	time_t now, last;
181	char buf[10240];
182	char zone[MAXHOSTNAMELEN + 13];
183	static const char *mirror_type = NULL;
184
185	done = 0;
186	last = 0;
187	max_retry = 3;
188	current = mirrors = NULL;
189	remote = NULL;
190
191	if (mirror_type == NULL && config_string(MIRROR_TYPE, &mirror_type)
192	    != 0) {
193		warnx("No MIRROR_TYPE defined");
194		return (-1);
195	}
196
197	if ((fd = mkstemp(path)) == -1) {
198		warn("mkstemp()");
199		return (-1);
200	}
201
202	retry = max_retry;
203
204	u = fetchParseURL(url);
205	while (remote == NULL) {
206		if (retry == max_retry) {
207			if (strcmp(u->scheme, "file") != 0 &&
208			    strcasecmp(mirror_type, "srv") == 0) {
209				snprintf(zone, sizeof(zone),
210				    "_%s._tcp.%s", u->scheme, u->host);
211				mirrors = dns_getsrvinfo(zone);
212				current = mirrors;
213			}
214		}
215
216		if (mirrors != NULL) {
217			strlcpy(u->host, current->host, sizeof(u->host));
218			u->port = current->port;
219		}
220
221		remote = fetchXGet(u, &st, "");
222		if (remote == NULL) {
223			--retry;
224			if (retry <= 0)
225				goto fetchfail;
226			if (mirrors == NULL) {
227				sleep(1);
228			} else {
229				current = current->next;
230				if (current == NULL)
231					current = mirrors;
232			}
233		}
234	}
235
236	while (done < st.size) {
237		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
238			break;
239
240		if (write(fd, buf, r) != r) {
241			warn("write()");
242			goto fetchfail;
243		}
244
245		done += r;
246		now = time(NULL);
247		if (now > last || done == st.size)
248			last = now;
249	}
250
251	if (ferror(remote))
252		goto fetchfail;
253
254	goto cleanup;
255
256fetchfail:
257	if (fd != -1) {
258		close(fd);
259		fd = -1;
260		unlink(path);
261	}
262
263cleanup:
264	if (remote != NULL)
265		fclose(remote);
266
267	return fd;
268}
269
270static struct fingerprint *
271parse_fingerprint(ucl_object_t *obj)
272{
273	ucl_object_t *cur;
274	ucl_object_iter_t it = NULL;
275	const char *function, *fp, *key;
276	struct fingerprint *f;
277	hash_t fct = HASH_UNKNOWN;
278
279	function = fp = NULL;
280
281	while ((cur = ucl_iterate_object(obj, &it, true))) {
282		key = ucl_object_key(cur);
283		if (cur->type != UCL_STRING)
284			continue;
285		if (strcasecmp(key, "function") == 0) {
286			function = ucl_object_tostring(cur);
287			continue;
288		}
289		if (strcasecmp(key, "fingerprint") == 0) {
290			fp = ucl_object_tostring(cur);
291			continue;
292		}
293	}
294
295	if (fp == NULL || function == NULL)
296		return (NULL);
297
298	if (strcasecmp(function, "sha256") == 0)
299		fct = HASH_SHA256;
300
301	if (fct == HASH_UNKNOWN) {
302		warnx("Unsupported hashing function: %s", function);
303		return (NULL);
304	}
305
306	f = calloc(1, sizeof(struct fingerprint));
307	f->type = fct;
308	strlcpy(f->hash, fp, sizeof(f->hash));
309
310	return (f);
311}
312
313static void
314free_fingerprint_list(struct fingerprint_list* list)
315{
316	struct fingerprint *fingerprint, *tmp;
317
318	STAILQ_FOREACH_SAFE(fingerprint, list, next, tmp) {
319		free(fingerprint->name);
320		free(fingerprint);
321	}
322	free(list);
323}
324
325static struct fingerprint *
326load_fingerprint(const char *dir, const char *filename)
327{
328	ucl_object_t *obj = NULL;
329	struct ucl_parser *p = NULL;
330	struct fingerprint *f;
331	char path[MAXPATHLEN];
332
333	f = NULL;
334
335	snprintf(path, MAXPATHLEN, "%s/%s", dir, filename);
336
337	p = ucl_parser_new(0);
338	if (!ucl_parser_add_file(p, path)) {
339		warnx("%s: %s", path, ucl_parser_get_error(p));
340		ucl_parser_free(p);
341		return (NULL);
342	}
343
344	obj = ucl_parser_get_object(p);
345
346	if (obj->type == UCL_OBJECT)
347		f = parse_fingerprint(obj);
348
349	if (f != NULL)
350		f->name = strdup(filename);
351
352	ucl_object_free(obj);
353	ucl_parser_free(p);
354
355	return (f);
356}
357
358static struct fingerprint_list *
359load_fingerprints(const char *path, int *count)
360{
361	DIR *d;
362	struct dirent *ent;
363	struct fingerprint *finger;
364	struct fingerprint_list *fingerprints;
365
366	*count = 0;
367
368	fingerprints = calloc(1, sizeof(struct fingerprint_list));
369	if (fingerprints == NULL)
370		return (NULL);
371	STAILQ_INIT(fingerprints);
372
373	if ((d = opendir(path)) == NULL)
374		return (NULL);
375
376	while ((ent = readdir(d))) {
377		if (strcmp(ent->d_name, ".") == 0 ||
378		    strcmp(ent->d_name, "..") == 0)
379			continue;
380		finger = load_fingerprint(path, ent->d_name);
381		if (finger != NULL) {
382			STAILQ_INSERT_TAIL(fingerprints, finger, next);
383			++(*count);
384		}
385	}
386
387	closedir(d);
388
389	return (fingerprints);
390}
391
392static void
393sha256_hash(unsigned char hash[SHA256_DIGEST_LENGTH],
394    char out[SHA256_DIGEST_LENGTH * 2 + 1])
395{
396	int i;
397
398	for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
399		sprintf(out + (i * 2), "%02x", hash[i]);
400
401	out[SHA256_DIGEST_LENGTH * 2] = '\0';
402}
403
404static void
405sha256_buf_bin(char *buf, size_t len, char hash[SHA256_DIGEST_LENGTH])
406{
407	SHA256_CTX sha256;
408
409	SHA256_Init(&sha256);
410	SHA256_Update(&sha256, buf, len);
411	SHA256_Final(hash, &sha256);
412}
413
414
415static void
416sha256_buf(char *buf, size_t len, char out[SHA256_DIGEST_LENGTH * 2 + 1])
417{
418	unsigned char hash[SHA256_DIGEST_LENGTH];
419	SHA256_CTX sha256;
420
421	out[0] = '\0';
422
423	SHA256_Init(&sha256);
424	SHA256_Update(&sha256, buf, len);
425	SHA256_Final(hash, &sha256);
426	sha256_hash(hash, out);
427}
428
429static int
430sha256_fd(int fd, char out[SHA256_DIGEST_LENGTH * 2 + 1])
431{
432	int my_fd;
433	FILE *fp;
434	char buffer[BUFSIZ];
435	unsigned char hash[SHA256_DIGEST_LENGTH];
436	size_t r;
437	int ret;
438	SHA256_CTX sha256;
439
440	my_fd = -1;
441	fp = NULL;
442	r = 0;
443	ret = 1;
444
445	out[0] = '\0';
446
447	/* Duplicate the fd so that fclose(3) does not close it. */
448	if ((my_fd = dup(fd)) == -1) {
449		warnx("dup");
450		goto cleanup;
451	}
452
453	if ((fp = fdopen(my_fd, "rb")) == NULL) {
454		warnx("fdopen");
455		goto cleanup;
456	}
457
458	SHA256_Init(&sha256);
459
460	while ((r = fread(buffer, 1, BUFSIZ, fp)) > 0)
461		SHA256_Update(&sha256, buffer, r);
462
463	if (ferror(fp) != 0) {
464		warnx("fread");
465		goto cleanup;
466	}
467
468	SHA256_Final(hash, &sha256);
469	sha256_hash(hash, out);
470	ret = 0;
471
472cleanup:
473	if (fp != NULL)
474		fclose(fp);
475	else if (my_fd != -1)
476		close(my_fd);
477	(void)lseek(fd, 0, SEEK_SET);
478
479	return (ret);
480}
481
482static RSA *
483load_rsa_public_key_buf(unsigned char *cert, int certlen)
484{
485	RSA *rsa = NULL;
486	BIO *bp;
487	char errbuf[1024];
488
489	bp = BIO_new_mem_buf((void *)cert, certlen);
490	if (!PEM_read_bio_RSA_PUBKEY(bp, &rsa, NULL, NULL)) {
491		warn("error reading public key: %s",
492		    ERR_error_string(ERR_get_error(), errbuf));
493		BIO_free(bp);
494		return (NULL);
495	}
496	BIO_free(bp);
497	return (rsa);
498}
499
500
501static bool
502rsa_verify_cert(int fd, unsigned char *key, int keylen,
503    unsigned char *sig, int siglen)
504{
505	char sha256[SHA256_DIGEST_LENGTH *2 +1];
506	char hash[SHA256_DIGEST_LENGTH];
507	char errbuf[1024];
508	RSA *rsa = NULL;
509	int ret;
510
511	lseek(fd, 0, SEEK_SET);
512	sha256_fd(fd, sha256);
513
514	SSL_load_error_strings();
515	OpenSSL_add_all_algorithms();
516	OpenSSL_add_all_ciphers();
517
518	sha256_buf_bin(sha256, strlen(sha256), hash);
519
520	rsa = load_rsa_public_key_buf(key, keylen);
521	if (rsa == NULL)
522		return (false);
523	ret = RSA_verify(NID_sha256, hash, sizeof(hash), sig, siglen, rsa);
524	if (ret == 0) {
525		warnx("%s: %s", key, ERR_error_string(ERR_get_error(), errbuf));
526		return (false);
527	}
528
529	RSA_free(rsa);
530	ERR_free_strings();
531
532	return (true);
533}
534
535static struct sig_cert *
536parse_cert(int fd) {
537	int my_fd;
538	struct sig_cert *sc;
539	FILE *fp;
540	struct sbuf *buf, *sig, *cert;
541	char *line;
542	size_t linecap;
543	ssize_t linelen;
544
545	buf = NULL;
546	my_fd = -1;
547	sc = NULL;
548	line = NULL;
549	linecap = 0;
550
551	if (lseek(fd, 0, 0) == -1) {
552		warn("lseek");
553		return (NULL);
554	}
555
556	/* Duplicate the fd so that fclose(3) does not close it. */
557	if ((my_fd = dup(fd)) == -1) {
558		warnx("dup");
559		return (NULL);
560	}
561
562	if ((fp = fdopen(my_fd, "rb")) == NULL) {
563		warn("fdopen");
564		close(my_fd);
565		return (NULL);
566	}
567
568	sig = sbuf_new_auto();
569	cert = sbuf_new_auto();
570
571	while ((linelen = getline(&line, &linecap, fp)) > 0) {
572		if (strcmp(line, "SIGNATURE\n") == 0) {
573			buf = sig;
574			continue;
575		} else if (strcmp(line, "CERT\n") == 0) {
576			buf = cert;
577			continue;
578		} else if (strcmp(line, "END\n") == 0) {
579			break;
580		}
581		if (buf != NULL)
582			sbuf_bcat(buf, line, linelen);
583	}
584
585	fclose(fp);
586
587	/* Trim out unrelated trailing newline */
588	sbuf_setpos(sig, sbuf_len(sig) - 1);
589
590	sbuf_finish(sig);
591	sbuf_finish(cert);
592
593	sc = calloc(1, sizeof(struct sig_cert));
594	sc->siglen = sbuf_len(sig);
595	sc->sig = calloc(1, sc->siglen);
596	memcpy(sc->sig, sbuf_data(sig), sc->siglen);
597
598	sc->certlen = sbuf_len(cert);
599	sc->cert = strdup(sbuf_data(cert));
600
601	sbuf_delete(sig);
602	sbuf_delete(cert);
603
604	return (sc);
605}
606
607static bool
608verify_signature(int fd_pkg, int fd_sig)
609{
610	struct fingerprint_list *trusted, *revoked;
611	struct fingerprint *fingerprint;
612	struct sig_cert *sc;
613	bool ret;
614	int trusted_count, revoked_count;
615	const char *fingerprints;
616	char path[MAXPATHLEN];
617	char hash[SHA256_DIGEST_LENGTH * 2 + 1];
618
619	sc = NULL;
620	trusted = revoked = NULL;
621	ret = false;
622
623	/* Read and parse fingerprints. */
624	if (config_string(FINGERPRINTS, &fingerprints) != 0) {
625		warnx("No CONFIG_FINGERPRINTS defined");
626		goto cleanup;
627	}
628
629	snprintf(path, MAXPATHLEN, "%s/trusted", fingerprints);
630	if ((trusted = load_fingerprints(path, &trusted_count)) == NULL) {
631		warnx("Error loading trusted certificates");
632		goto cleanup;
633	}
634
635	if (trusted_count == 0 || trusted == NULL) {
636		fprintf(stderr, "No trusted certificates found.\n");
637		goto cleanup;
638	}
639
640	snprintf(path, MAXPATHLEN, "%s/revoked", fingerprints);
641	if ((revoked = load_fingerprints(path, &revoked_count)) == NULL) {
642		warnx("Error loading revoked certificates");
643		goto cleanup;
644	}
645
646	/* Read certificate and signature in. */
647	if ((sc = parse_cert(fd_sig)) == NULL) {
648		warnx("Error parsing certificate");
649		goto cleanup;
650	}
651	/* Explicitly mark as non-trusted until proven otherwise. */
652	sc->trusted = false;
653
654	/* Parse signature and pubkey out of the certificate */
655	sha256_buf(sc->cert, sc->certlen, hash);
656
657	/* Check if this hash is revoked */
658	if (revoked != NULL) {
659		STAILQ_FOREACH(fingerprint, revoked, next) {
660			if (strcasecmp(fingerprint->hash, hash) == 0) {
661				fprintf(stderr, "The package was signed with "
662				    "revoked certificate %s\n",
663				    fingerprint->name);
664				goto cleanup;
665			}
666		}
667	}
668
669	STAILQ_FOREACH(fingerprint, trusted, next) {
670		if (strcasecmp(fingerprint->hash, hash) == 0) {
671			sc->trusted = true;
672			sc->name = strdup(fingerprint->name);
673			break;
674		}
675	}
676
677	if (sc->trusted == false) {
678		fprintf(stderr, "No trusted fingerprint found matching "
679		    "package's certificate\n");
680		goto cleanup;
681	}
682
683	/* Verify the signature. */
684	printf("Verifying signature with trusted certificate %s... ", sc->name);
685	if (rsa_verify_cert(fd_pkg, sc->cert, sc->certlen, sc->sig,
686	    sc->siglen) == false) {
687		printf("failed\n");
688		fprintf(stderr, "Signature is not valid\n");
689		goto cleanup;
690	}
691	printf("done\n");
692
693	ret = true;
694
695cleanup:
696	if (trusted)
697		free_fingerprint_list(trusted);
698	if (revoked)
699		free_fingerprint_list(revoked);
700	if (sc) {
701		free(sc->cert);
702		free(sc->sig);
703		free(sc->name);
704		free(sc);
705	}
706
707	return (ret);
708}
709
710static int
711bootstrap_pkg(bool force)
712{
713	int fd_pkg, fd_sig;
714	int ret;
715	char url[MAXPATHLEN];
716	char tmppkg[MAXPATHLEN];
717	char tmpsig[MAXPATHLEN];
718	const char *packagesite;
719	const char *signature_type;
720	char pkgstatic[MAXPATHLEN];
721
722	fd_sig = -1;
723	ret = -1;
724
725	if (config_string(PACKAGESITE, &packagesite) != 0) {
726		warnx("No PACKAGESITE defined");
727		return (-1);
728	}
729
730	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
731		warnx("Error looking up SIGNATURE_TYPE");
732		return (-1);
733	}
734
735	printf("Bootstrapping pkg from %s, please wait...\n", packagesite);
736
737	/* Support pkg+http:// for PACKAGESITE which is the new format
738	   in 1.2 to avoid confusion on why http://pkg.FreeBSD.org has
739	   no A record. */
740	if (strncmp(URL_SCHEME_PREFIX, packagesite,
741	    strlen(URL_SCHEME_PREFIX)) == 0)
742		packagesite += strlen(URL_SCHEME_PREFIX);
743	snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz", packagesite);
744
745	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
746	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
747
748	if ((fd_pkg = fetch_to_fd(url, tmppkg)) == -1)
749		goto fetchfail;
750
751	if (signature_type != NULL &&
752	    strcasecmp(signature_type, "NONE") != 0) {
753		if (strcasecmp(signature_type, "FINGERPRINTS") != 0) {
754			warnx("Signature type %s is not supported for "
755			    "bootstrapping.", signature_type);
756			goto cleanup;
757		}
758
759		snprintf(tmpsig, MAXPATHLEN, "%s/pkg.txz.sig.XXXXXX",
760		    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
761		snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz.sig",
762		    packagesite);
763
764		if ((fd_sig = fetch_to_fd(url, tmpsig)) == -1) {
765			fprintf(stderr, "Signature for pkg not available.\n");
766			goto fetchfail;
767		}
768
769		if (verify_signature(fd_pkg, fd_sig) == false)
770			goto cleanup;
771	}
772
773	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
774		ret = install_pkg_static(pkgstatic, tmppkg, force);
775
776	goto cleanup;
777
778fetchfail:
779	warnx("Error fetching %s: %s", url, fetchLastErrString);
780	fprintf(stderr, "A pre-built version of pkg could not be found for "
781	    "your system.\n");
782	fprintf(stderr, "Consider changing PACKAGESITE or installing it from "
783	    "ports: 'ports-mgmt/pkg'.\n");
784
785cleanup:
786	if (fd_sig != -1) {
787		close(fd_sig);
788		unlink(tmpsig);
789	}
790	close(fd_pkg);
791	unlink(tmppkg);
792
793	return (ret);
794}
795
796static const char confirmation_message[] =
797"The package management tool is not yet installed on your system.\n"
798"Do you want to fetch and install it now? [y/N]: ";
799
800static const char non_interactive_message[] =
801"The package management tool is not yet installed on your system.\n"
802"Please set ASSUME_ALWAYS_YES=yes environment variable to be able to bootstrap "
803"in non-interactive (stdin not being a tty)\n";
804
805static int
806pkg_query_yes_no(void)
807{
808	int ret, c;
809
810	c = getchar();
811
812	if (c == 'y' || c == 'Y')
813		ret = 1;
814	else
815		ret = 0;
816
817	while (c != '\n' && c != EOF)
818		c = getchar();
819
820	return (ret);
821}
822
823static int
824bootstrap_pkg_local(const char *pkgpath, bool force)
825{
826	char path[MAXPATHLEN];
827	char pkgstatic[MAXPATHLEN];
828	const char *signature_type;
829	int fd_pkg, fd_sig, ret;
830
831	fd_sig = -1;
832	ret = -1;
833
834	fd_pkg = open(pkgpath, O_RDONLY);
835	if (fd_pkg == -1)
836		err(EXIT_FAILURE, "Unable to open %s", pkgpath);
837
838	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
839		warnx("Error looking up SIGNATURE_TYPE");
840		return (-1);
841	}
842	if (signature_type != NULL &&
843	    strcasecmp(signature_type, "NONE") != 0) {
844		if (strcasecmp(signature_type, "FINGERPRINTS") != 0) {
845			warnx("Signature type %s is not supported for "
846			    "bootstrapping.", signature_type);
847			goto cleanup;
848		}
849
850		snprintf(path, sizeof(path), "%s.sig", pkgpath);
851
852		if ((fd_sig = open(path, O_RDONLY)) == -1) {
853			fprintf(stderr, "Signature for pkg not available.\n");
854			goto cleanup;
855		}
856
857		if (verify_signature(fd_pkg, fd_sig) == false)
858			goto cleanup;
859	}
860
861	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
862		ret = install_pkg_static(pkgstatic, pkgpath, force);
863
864cleanup:
865	close(fd_pkg);
866	if (fd_sig != -1)
867		close(fd_sig);
868
869	return (ret);
870}
871
872int
873main(int argc, char *argv[])
874{
875	char pkgpath[MAXPATHLEN];
876	const char *pkgarg;
877	bool bootstrap_only, force, yes;
878
879	bootstrap_only = false;
880	force = false;
881	pkgarg = NULL;
882	yes = false;
883
884	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
885	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
886
887	if (argc > 1 && strcmp(argv[1], "bootstrap") == 0) {
888		bootstrap_only = true;
889		if (argc == 3 && strcmp(argv[2], "-f") == 0)
890			force = true;
891	}
892
893	if ((bootstrap_only && force) || access(pkgpath, X_OK) == -1) {
894		/*
895		 * To allow 'pkg -N' to be used as a reliable test for whether
896		 * a system is configured to use pkg, don't bootstrap pkg
897		 * when that argument is given as argv[1].
898		 */
899		if (argv[1] != NULL && strcmp(argv[1], "-N") == 0)
900			errx(EXIT_FAILURE, "pkg is not installed");
901
902		config_init();
903
904		if (argc > 1 && strcmp(argv[1], "add") == 0) {
905			if (argc > 2 && strcmp(argv[2], "-f") == 0) {
906				force = true;
907				pkgarg = argv[3];
908			} else
909				pkgarg = argv[2];
910			if (pkgarg == NULL) {
911				fprintf(stderr, "Path to pkg.txz required\n");
912				exit(EXIT_FAILURE);
913			}
914			if (access(pkgarg, R_OK) == -1) {
915				fprintf(stderr, "No such file: %s\n", pkgarg);
916				exit(EXIT_FAILURE);
917			}
918			if (bootstrap_pkg_local(pkgarg, force) != 0)
919				exit(EXIT_FAILURE);
920			exit(EXIT_SUCCESS);
921		}
922		/*
923		 * Do not ask for confirmation if either of stdin or stdout is
924		 * not tty. Check the environment to see if user has answer
925		 * tucked in there already.
926		 */
927		config_bool(ASSUME_ALWAYS_YES, &yes);
928		if (!yes) {
929			if (!isatty(fileno(stdin))) {
930				fprintf(stderr, non_interactive_message);
931				exit(EXIT_FAILURE);
932			}
933
934			printf("%s", confirmation_message);
935			if (pkg_query_yes_no() == 0)
936				exit(EXIT_FAILURE);
937		}
938		if (bootstrap_pkg(force) != 0)
939			exit(EXIT_FAILURE);
940		config_finish();
941
942		if (bootstrap_only)
943			exit(EXIT_SUCCESS);
944	} else if (bootstrap_only) {
945		printf("pkg already bootstrapped at %s\n", pkgpath);
946		exit(EXIT_SUCCESS);
947	}
948
949	execv(pkgpath, argv);
950
951	/* NOT REACHED */
952	return (EXIT_FAILURE);
953}
954