pkg.c revision 268896 
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: stable/10/usr.sbin/pkg/pkg.c 268896 2014-07-19 23:44:57Z bapt $");
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_filter_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	if (remote == NULL)
237		goto fetchfail;
238
239	while (done < st.size) {
240		if ((r = fread(buf, 1, sizeof(buf), remote)) < 1)
241			break;
242
243		if (write(fd, buf, r) != r) {
244			warn("write()");
245			goto fetchfail;
246		}
247
248		done += r;
249		now = time(NULL);
250		if (now > last || done == st.size)
251			last = now;
252	}
253
254	if (ferror(remote))
255		goto fetchfail;
256
257	goto cleanup;
258
259fetchfail:
260	if (fd != -1) {
261		close(fd);
262		fd = -1;
263		unlink(path);
264	}
265
266cleanup:
267	if (remote != NULL)
268		fclose(remote);
269
270	return fd;
271}
272
273static struct fingerprint *
274parse_fingerprint(ucl_object_t *obj)
275{
276	const ucl_object_t *cur;
277	ucl_object_iter_t it = NULL;
278	const char *function, *fp, *key;
279	struct fingerprint *f;
280	hash_t fct = HASH_UNKNOWN;
281
282	function = fp = NULL;
283
284	while ((cur = ucl_iterate_object(obj, &it, true))) {
285		key = ucl_object_key(cur);
286		if (cur->type != UCL_STRING)
287			continue;
288		if (strcasecmp(key, "function") == 0) {
289			function = ucl_object_tostring(cur);
290			continue;
291		}
292		if (strcasecmp(key, "fingerprint") == 0) {
293			fp = ucl_object_tostring(cur);
294			continue;
295		}
296	}
297
298	if (fp == NULL || function == NULL)
299		return (NULL);
300
301	if (strcasecmp(function, "sha256") == 0)
302		fct = HASH_SHA256;
303
304	if (fct == HASH_UNKNOWN) {
305		warnx("Unsupported hashing function: %s", function);
306		return (NULL);
307	}
308
309	f = calloc(1, sizeof(struct fingerprint));
310	f->type = fct;
311	strlcpy(f->hash, fp, sizeof(f->hash));
312
313	return (f);
314}
315
316static void
317free_fingerprint_list(struct fingerprint_list* list)
318{
319	struct fingerprint *fingerprint, *tmp;
320
321	STAILQ_FOREACH_SAFE(fingerprint, list, next, tmp) {
322		if (fingerprint->name)
323			free(fingerprint->name);
324		free(fingerprint);
325	}
326	free(list);
327}
328
329static struct fingerprint *
330load_fingerprint(const char *dir, const char *filename)
331{
332	ucl_object_t *obj = NULL;
333	struct ucl_parser *p = NULL;
334	struct fingerprint *f;
335	char path[MAXPATHLEN];
336
337	f = NULL;
338
339	snprintf(path, MAXPATHLEN, "%s/%s", dir, filename);
340
341	p = ucl_parser_new(0);
342	if (!ucl_parser_add_file(p, path)) {
343		warnx("%s: %s", path, ucl_parser_get_error(p));
344		ucl_parser_free(p);
345		return (NULL);
346	}
347
348	obj = ucl_parser_get_object(p);
349
350	if (obj->type == UCL_OBJECT)
351		f = parse_fingerprint(obj);
352
353	if (f != NULL)
354		f->name = strdup(filename);
355
356	ucl_object_unref(obj);
357	ucl_parser_free(p);
358
359	return (f);
360}
361
362static struct fingerprint_list *
363load_fingerprints(const char *path, int *count)
364{
365	DIR *d;
366	struct dirent *ent;
367	struct fingerprint *finger;
368	struct fingerprint_list *fingerprints;
369
370	*count = 0;
371
372	fingerprints = calloc(1, sizeof(struct fingerprint_list));
373	if (fingerprints == NULL)
374		return (NULL);
375	STAILQ_INIT(fingerprints);
376
377	if ((d = opendir(path)) == NULL)
378		return (NULL);
379
380	while ((ent = readdir(d))) {
381		if (strcmp(ent->d_name, ".") == 0 ||
382		    strcmp(ent->d_name, "..") == 0)
383			continue;
384		finger = load_fingerprint(path, ent->d_name);
385		if (finger != NULL) {
386			STAILQ_INSERT_TAIL(fingerprints, finger, next);
387			++(*count);
388		}
389	}
390
391	closedir(d);
392
393	return (fingerprints);
394}
395
396static void
397sha256_hash(unsigned char hash[SHA256_DIGEST_LENGTH],
398    char out[SHA256_DIGEST_LENGTH * 2 + 1])
399{
400	int i;
401
402	for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
403		sprintf(out + (i * 2), "%02x", hash[i]);
404
405	out[SHA256_DIGEST_LENGTH * 2] = '\0';
406}
407
408static void
409sha256_buf(char *buf, size_t len, char out[SHA256_DIGEST_LENGTH * 2 + 1])
410{
411	unsigned char hash[SHA256_DIGEST_LENGTH];
412	SHA256_CTX sha256;
413
414	out[0] = '\0';
415
416	SHA256_Init(&sha256);
417	SHA256_Update(&sha256, buf, len);
418	SHA256_Final(hash, &sha256);
419	sha256_hash(hash, out);
420}
421
422static int
423sha256_fd(int fd, char out[SHA256_DIGEST_LENGTH * 2 + 1])
424{
425	int my_fd;
426	FILE *fp;
427	char buffer[BUFSIZ];
428	unsigned char hash[SHA256_DIGEST_LENGTH];
429	size_t r;
430	int ret;
431	SHA256_CTX sha256;
432
433	my_fd = -1;
434	fp = NULL;
435	r = 0;
436	ret = 1;
437
438	out[0] = '\0';
439
440	/* Duplicate the fd so that fclose(3) does not close it. */
441	if ((my_fd = dup(fd)) == -1) {
442		warnx("dup");
443		goto cleanup;
444	}
445
446	if ((fp = fdopen(my_fd, "rb")) == NULL) {
447		warnx("fdopen");
448		goto cleanup;
449	}
450
451	SHA256_Init(&sha256);
452
453	while ((r = fread(buffer, 1, BUFSIZ, fp)) > 0)
454		SHA256_Update(&sha256, buffer, r);
455
456	if (ferror(fp) != 0) {
457		warnx("fread");
458		goto cleanup;
459	}
460
461	SHA256_Final(hash, &sha256);
462	sha256_hash(hash, out);
463	ret = 0;
464
465cleanup:
466	if (fp != NULL)
467		fclose(fp);
468	else if (my_fd != -1)
469		close(my_fd);
470	(void)lseek(fd, 0, SEEK_SET);
471
472	return (ret);
473}
474
475static EVP_PKEY *
476load_public_key_buf(const unsigned char *cert, int certlen)
477{
478	EVP_PKEY *pkey;
479	BIO *bp;
480	char errbuf[1024];
481
482	bp = BIO_new_mem_buf(__DECONST(void *, cert), certlen);
483
484	if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
485		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
486
487	BIO_free(bp);
488
489	return (pkey);
490}
491
492static bool
493rsa_verify_cert(int fd, const unsigned char *key, int keylen,
494    unsigned char *sig, int siglen)
495{
496	EVP_MD_CTX *mdctx;
497	EVP_PKEY *pkey;
498	char sha256[(SHA256_DIGEST_LENGTH * 2) + 2];
499	char errbuf[1024];
500	bool ret;
501
502	pkey = NULL;
503	mdctx = NULL;
504	ret = false;
505
506	/* Compute SHA256 of the package. */
507	if (lseek(fd, 0, 0) == -1) {
508		warn("lseek");
509		goto cleanup;
510	}
511	if ((sha256_fd(fd, sha256)) == -1) {
512		warnx("Error creating SHA256 hash for package");
513		goto cleanup;
514	}
515
516	if ((pkey = load_public_key_buf(key, keylen)) == NULL) {
517		warnx("Error reading public key");
518		goto cleanup;
519	}
520
521	/* Verify signature of the SHA256(pkg) is valid. */
522	if ((mdctx = EVP_MD_CTX_create()) == NULL) {
523		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
524		goto error;
525	}
526
527	if (EVP_DigestVerifyInit(mdctx, NULL, EVP_sha256(), NULL, pkey) != 1) {
528		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
529		goto error;
530	}
531	if (EVP_DigestVerifyUpdate(mdctx, sha256, strlen(sha256)) != 1) {
532		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
533		goto error;
534	}
535
536	if (EVP_DigestVerifyFinal(mdctx, sig, siglen) != 1) {
537		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
538		goto error;
539	}
540
541	ret = true;
542	printf("done\n");
543	goto cleanup;
544
545error:
546	printf("failed\n");
547
548cleanup:
549	if (pkey)
550		EVP_PKEY_free(pkey);
551	if (mdctx)
552		EVP_MD_CTX_destroy(mdctx);
553	ERR_free_strings();
554
555	return (ret);
556}
557
558static struct sig_cert *
559parse_cert(int fd) {
560	int my_fd;
561	struct sig_cert *sc;
562	FILE *fp;
563	struct sbuf *buf, *sig, *cert;
564	char *line;
565	size_t linecap;
566	ssize_t linelen;
567
568	buf = NULL;
569	my_fd = -1;
570	sc = NULL;
571	line = NULL;
572	linecap = 0;
573
574	if (lseek(fd, 0, 0) == -1) {
575		warn("lseek");
576		return (NULL);
577	}
578
579	/* Duplicate the fd so that fclose(3) does not close it. */
580	if ((my_fd = dup(fd)) == -1) {
581		warnx("dup");
582		return (NULL);
583	}
584
585	if ((fp = fdopen(my_fd, "rb")) == NULL) {
586		warn("fdopen");
587		close(my_fd);
588		return (NULL);
589	}
590
591	sig = sbuf_new_auto();
592	cert = sbuf_new_auto();
593
594	while ((linelen = getline(&line, &linecap, fp)) > 0) {
595		if (strcmp(line, "SIGNATURE\n") == 0) {
596			buf = sig;
597			continue;
598		} else if (strcmp(line, "CERT\n") == 0) {
599			buf = cert;
600			continue;
601		} else if (strcmp(line, "END\n") == 0) {
602			break;
603		}
604		if (buf != NULL)
605			sbuf_bcat(buf, line, linelen);
606	}
607
608	fclose(fp);
609
610	/* Trim out unrelated trailing newline */
611	sbuf_setpos(sig, sbuf_len(sig) - 1);
612
613	sbuf_finish(sig);
614	sbuf_finish(cert);
615
616	sc = calloc(1, sizeof(struct sig_cert));
617	sc->siglen = sbuf_len(sig);
618	sc->sig = calloc(1, sc->siglen);
619	memcpy(sc->sig, sbuf_data(sig), sc->siglen);
620
621	sc->certlen = sbuf_len(cert);
622	sc->cert = strdup(sbuf_data(cert));
623
624	sbuf_delete(sig);
625	sbuf_delete(cert);
626
627	return (sc);
628}
629
630static bool
631verify_signature(int fd_pkg, int fd_sig)
632{
633	struct fingerprint_list *trusted, *revoked;
634	struct fingerprint *fingerprint;
635	struct sig_cert *sc;
636	bool ret;
637	int trusted_count, revoked_count;
638	const char *fingerprints;
639	char path[MAXPATHLEN];
640	char hash[SHA256_DIGEST_LENGTH * 2 + 1];
641
642	sc = NULL;
643	trusted = revoked = NULL;
644	ret = false;
645
646	/* Read and parse fingerprints. */
647	if (config_string(FINGERPRINTS, &fingerprints) != 0) {
648		warnx("No CONFIG_FINGERPRINTS defined");
649		goto cleanup;
650	}
651
652	snprintf(path, MAXPATHLEN, "%s/trusted", fingerprints);
653	if ((trusted = load_fingerprints(path, &trusted_count)) == NULL) {
654		warnx("Error loading trusted certificates");
655		goto cleanup;
656	}
657
658	if (trusted_count == 0 || trusted == NULL) {
659		fprintf(stderr, "No trusted certificates found.\n");
660		goto cleanup;
661	}
662
663	snprintf(path, MAXPATHLEN, "%s/revoked", fingerprints);
664	if ((revoked = load_fingerprints(path, &revoked_count)) == NULL) {
665		warnx("Error loading revoked certificates");
666		goto cleanup;
667	}
668
669	/* Read certificate and signature in. */
670	if ((sc = parse_cert(fd_sig)) == NULL) {
671		warnx("Error parsing certificate");
672		goto cleanup;
673	}
674	/* Explicitly mark as non-trusted until proven otherwise. */
675	sc->trusted = false;
676
677	/* Parse signature and pubkey out of the certificate */
678	sha256_buf(sc->cert, sc->certlen, hash);
679
680	/* Check if this hash is revoked */
681	if (revoked != NULL) {
682		STAILQ_FOREACH(fingerprint, revoked, next) {
683			if (strcasecmp(fingerprint->hash, hash) == 0) {
684				fprintf(stderr, "The package was signed with "
685				    "revoked certificate %s\n",
686				    fingerprint->name);
687				goto cleanup;
688			}
689		}
690	}
691
692	STAILQ_FOREACH(fingerprint, trusted, next) {
693		if (strcasecmp(fingerprint->hash, hash) == 0) {
694			sc->trusted = true;
695			sc->name = strdup(fingerprint->name);
696			break;
697		}
698	}
699
700	if (sc->trusted == false) {
701		fprintf(stderr, "No trusted fingerprint found matching "
702		    "package's certificate\n");
703		goto cleanup;
704	}
705
706	/* Verify the signature. */
707	printf("Verifying signature with trusted certificate %s... ", sc->name);
708	if (rsa_verify_cert(fd_pkg, sc->cert, sc->certlen, sc->sig,
709	    sc->siglen) == false) {
710		fprintf(stderr, "Signature is not valid\n");
711		goto cleanup;
712	}
713
714	ret = true;
715
716cleanup:
717	if (trusted)
718		free_fingerprint_list(trusted);
719	if (revoked)
720		free_fingerprint_list(revoked);
721	if (sc) {
722		if (sc->cert)
723			free(sc->cert);
724		if (sc->sig)
725			free(sc->sig);
726		if (sc->name)
727			free(sc->name);
728		free(sc);
729	}
730
731	return (ret);
732}
733
734static int
735bootstrap_pkg(bool force)
736{
737	int fd_pkg, fd_sig;
738	int ret;
739	char url[MAXPATHLEN];
740	char tmppkg[MAXPATHLEN];
741	char tmpsig[MAXPATHLEN];
742	const char *packagesite;
743	const char *signature_type;
744	char pkgstatic[MAXPATHLEN];
745
746	fd_sig = -1;
747	ret = -1;
748
749	if (config_string(PACKAGESITE, &packagesite) != 0) {
750		warnx("No PACKAGESITE defined");
751		return (-1);
752	}
753
754	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
755		warnx("Error looking up SIGNATURE_TYPE");
756		return (-1);
757	}
758
759	printf("Bootstrapping pkg from %s, please wait...\n", packagesite);
760
761	/* Support pkg+http:// for PACKAGESITE which is the new format
762	   in 1.2 to avoid confusion on why http://pkg.FreeBSD.org has
763	   no A record. */
764	if (strncmp(URL_SCHEME_PREFIX, packagesite,
765	    strlen(URL_SCHEME_PREFIX)) == 0)
766		packagesite += strlen(URL_SCHEME_PREFIX);
767	snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz", packagesite);
768
769	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
770	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
771
772	if ((fd_pkg = fetch_to_fd(url, tmppkg)) == -1)
773		goto fetchfail;
774
775	if (signature_type != NULL &&
776	    strcasecmp(signature_type, "FINGERPRINTS") == 0) {
777		snprintf(tmpsig, MAXPATHLEN, "%s/pkg.txz.sig.XXXXXX",
778		    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
779		snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz.sig",
780		    packagesite);
781
782		if ((fd_sig = fetch_to_fd(url, tmpsig)) == -1) {
783			fprintf(stderr, "Signature for pkg not available.\n");
784			goto fetchfail;
785		}
786
787		if (verify_signature(fd_pkg, fd_sig) == false)
788			goto cleanup;
789	}
790
791	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
792		ret = install_pkg_static(pkgstatic, tmppkg, force);
793
794	goto cleanup;
795
796fetchfail:
797	warnx("Error fetching %s: %s", url, fetchLastErrString);
798	fprintf(stderr, "A pre-built version of pkg could not be found for "
799	    "your system.\n");
800	fprintf(stderr, "Consider changing PACKAGESITE or installing it from "
801	    "ports: 'ports-mgmt/pkg'.\n");
802
803cleanup:
804	if (fd_sig != -1) {
805		close(fd_sig);
806		unlink(tmpsig);
807	}
808	close(fd_pkg);
809	unlink(tmppkg);
810
811	return (ret);
812}
813
814static const char confirmation_message[] =
815"The package management tool is not yet installed on your system.\n"
816"Do you want to fetch and install it now? [y/N]: ";
817
818static int
819pkg_query_yes_no(void)
820{
821	int ret, c;
822
823	c = getchar();
824
825	if (c == 'y' || c == 'Y')
826		ret = 1;
827	else
828		ret = 0;
829
830	while (c != '\n' && c != EOF)
831		c = getchar();
832
833	return (ret);
834}
835
836static int
837bootstrap_pkg_local(const char *pkgpath, bool force)
838{
839	char path[MAXPATHLEN];
840	char pkgstatic[MAXPATHLEN];
841	const char *signature_type;
842	int fd_pkg, fd_sig, ret;
843
844	fd_sig = -1;
845	ret = -1;
846
847	fd_pkg = open(pkgpath, O_RDONLY);
848	if (fd_pkg == -1)
849		err(EXIT_FAILURE, "Unable to open %s", pkgpath);
850
851	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
852		warnx("Error looking up SIGNATURE_TYPE");
853		return (-1);
854	}
855	if (signature_type != NULL &&
856	    strcasecmp(signature_type, "FINGERPRINTS") == 0) {
857		snprintf(path, sizeof(path), "%s.sig", pkgpath);
858
859		if ((fd_sig = open(path, O_RDONLY)) == -1) {
860			fprintf(stderr, "Signature for pkg not available.\n");
861			goto cleanup;
862		}
863
864		if (verify_signature(fd_pkg, fd_sig) == false)
865			goto cleanup;
866	}
867
868	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
869		ret = install_pkg_static(pkgstatic, pkgpath, force);
870
871cleanup:
872	close(fd_pkg);
873	if (fd_sig != -1)
874		close(fd_sig);
875
876	return (ret);
877}
878
879int
880main(__unused int argc, char *argv[])
881{
882	char pkgpath[MAXPATHLEN];
883	const char *pkgarg;
884	bool bootstrap_only, force, yes;
885
886	bootstrap_only = false;
887	force = false;
888	pkgarg = NULL;
889	yes = false;
890
891	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
892	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
893
894	if (argc > 1 && strcmp(argv[1], "bootstrap") == 0) {
895		bootstrap_only = true;
896		if (argc == 3 && strcmp(argv[2], "-f") == 0)
897			force = true;
898	}
899
900	if ((bootstrap_only && force) || access(pkgpath, X_OK) == -1) {
901		/*
902		 * To allow 'pkg -N' to be used as a reliable test for whether
903		 * a system is configured to use pkg, don't bootstrap pkg
904		 * when that argument is given as argv[1].
905		 */
906		if (argv[1] != NULL && strcmp(argv[1], "-N") == 0)
907			errx(EXIT_FAILURE, "pkg is not installed");
908
909		config_init();
910
911		if (argc > 1 && strcmp(argv[1], "add") == 0) {
912			if (argc > 2 && strcmp(argv[2], "-f") == 0) {
913				force = true;
914				pkgarg = argv[3];
915			} else
916				pkgarg = argv[2];
917			if (pkgarg == NULL) {
918				fprintf(stderr, "Path to pkg.txz required\n");
919				exit(EXIT_FAILURE);
920			}
921			if (access(pkgarg, R_OK) == -1) {
922				fprintf(stderr, "No such file: %s\n", pkgarg);
923				exit(EXIT_FAILURE);
924			}
925			if (bootstrap_pkg_local(pkgarg, force) != 0)
926				exit(EXIT_FAILURE);
927			exit(EXIT_SUCCESS);
928		}
929		/*
930		 * Do not ask for confirmation if either of stdin or stdout is
931		 * not tty. Check the environment to see if user has answer
932		 * tucked in there already.
933		 */
934		config_bool(ASSUME_ALWAYS_YES, &yes);
935		if (!yes) {
936			printf("%s", confirmation_message);
937			if (!isatty(fileno(stdin)))
938				exit(EXIT_FAILURE);
939
940			if (pkg_query_yes_no() == 0)
941				exit(EXIT_FAILURE);
942		}
943		if (bootstrap_pkg(force) != 0)
944			exit(EXIT_FAILURE);
945		config_finish();
946
947		if (bootstrap_only)
948			exit(EXIT_SUCCESS);
949	} else if (bootstrap_only) {
950		printf("pkg already bootstrapped at %s\n", pkgpath);
951		exit(EXIT_SUCCESS);
952	}
953
954	execv(pkgpath, argv);
955
956	/* NOT REACHED */
957	return (EXIT_FAILURE);
958}
959