pkg.c revision 283793 
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 283793 2015-05-30 21:49:18Z 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 <unistd.h>
51#include <ucl.h>
52
53#include <openssl/err.h>
54#include <openssl/ssl.h>
55
56#include "dns_utils.h"
57#include "config.h"
58
59struct sig_cert {
60	char *name;
61	unsigned char *sig;
62	int siglen;
63	unsigned char *cert;
64	int certlen;
65	bool trusted;
66};
67
68typedef enum {
69       HASH_UNKNOWN,
70       HASH_SHA256,
71} hash_t;
72
73struct fingerprint {
74       hash_t type;
75       char *name;
76       char hash[BUFSIZ];
77       STAILQ_ENTRY(fingerprint) next;
78};
79
80STAILQ_HEAD(fingerprint_list, fingerprint);
81
82static int
83extract_pkg_static(int fd, char *p, int sz)
84{
85	struct archive *a;
86	struct archive_entry *ae;
87	char *end;
88	int ret, r;
89
90	ret = -1;
91	a = archive_read_new();
92	if (a == NULL) {
93		warn("archive_read_new");
94		return (ret);
95	}
96	archive_read_support_filter_all(a);
97	archive_read_support_format_tar(a);
98
99	if (lseek(fd, 0, 0) == -1) {
100		warn("lseek");
101		goto cleanup;
102	}
103
104	if (archive_read_open_fd(a, fd, 4096) != ARCHIVE_OK) {
105		warnx("archive_read_open_fd: %s", archive_error_string(a));
106		goto cleanup;
107	}
108
109	ae = NULL;
110	while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK) {
111		end = strrchr(archive_entry_pathname(ae), '/');
112		if (end == NULL)
113			continue;
114
115		if (strcmp(end, "/pkg-static") == 0) {
116			r = archive_read_extract(a, ae,
117			    ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM |
118			    ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_ACL |
119			    ARCHIVE_EXTRACT_FFLAGS | ARCHIVE_EXTRACT_XATTR);
120			strlcpy(p, archive_entry_pathname(ae), sz);
121			break;
122		}
123	}
124
125	if (r == ARCHIVE_OK)
126		ret = 0;
127	else
128		warnx("failed to extract pkg-static: %s",
129		    archive_error_string(a));
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	ssize_t r;
180	char buf[10240];
181	char zone[MAXHOSTNAMELEN + 13];
182	static const char *mirror_type = NULL;
183
184	max_retry = 3;
185	current = mirrors = NULL;
186	remote = NULL;
187
188	if (mirror_type == NULL && config_string(MIRROR_TYPE, &mirror_type)
189	    != 0) {
190		warnx("No MIRROR_TYPE defined");
191		return (-1);
192	}
193
194	if ((fd = mkstemp(path)) == -1) {
195		warn("mkstemp()");
196		return (-1);
197	}
198
199	retry = max_retry;
200
201	if ((u = fetchParseURL(url)) == NULL) {
202		warn("fetchParseURL('%s')", url);
203		return (-1);
204	}
205
206	while (remote == NULL) {
207		if (retry == max_retry) {
208			if (strcmp(u->scheme, "file") != 0 &&
209			    strcasecmp(mirror_type, "srv") == 0) {
210				snprintf(zone, sizeof(zone),
211				    "_%s._tcp.%s", u->scheme, u->host);
212				mirrors = dns_getsrvinfo(zone);
213				current = mirrors;
214			}
215		}
216
217		if (mirrors != NULL) {
218			strlcpy(u->host, current->host, sizeof(u->host));
219			u->port = current->port;
220		}
221
222		remote = fetchXGet(u, &st, "");
223		if (remote == NULL) {
224			--retry;
225			if (retry <= 0)
226				goto fetchfail;
227			if (mirrors == NULL) {
228				sleep(1);
229			} else {
230				current = current->next;
231				if (current == NULL)
232					current = mirrors;
233			}
234		}
235	}
236
237	while ((r = fread(buf, 1, sizeof(buf), remote)) > 0) {
238		if (write(fd, buf, r) != r) {
239			warn("write()");
240			goto fetchfail;
241		}
242	}
243
244	if (r != 0) {
245		warn("An error occurred while fetching pkg(8)");
246		goto fetchfail;
247	}
248
249	if (ferror(remote))
250		goto fetchfail;
251
252	goto cleanup;
253
254fetchfail:
255	if (fd != -1) {
256		close(fd);
257		fd = -1;
258		unlink(path);
259	}
260
261cleanup:
262	if (remote != NULL)
263		fclose(remote);
264
265	return fd;
266}
267
268static struct fingerprint *
269parse_fingerprint(ucl_object_t *obj)
270{
271	const ucl_object_t *cur;
272	ucl_object_iter_t it = NULL;
273	const char *function, *fp, *key;
274	struct fingerprint *f;
275	hash_t fct = HASH_UNKNOWN;
276
277	function = fp = NULL;
278
279	while ((cur = ucl_iterate_object(obj, &it, true))) {
280		key = ucl_object_key(cur);
281		if (cur->type != UCL_STRING)
282			continue;
283		if (strcasecmp(key, "function") == 0) {
284			function = ucl_object_tostring(cur);
285			continue;
286		}
287		if (strcasecmp(key, "fingerprint") == 0) {
288			fp = ucl_object_tostring(cur);
289			continue;
290		}
291	}
292
293	if (fp == NULL || function == NULL)
294		return (NULL);
295
296	if (strcasecmp(function, "sha256") == 0)
297		fct = HASH_SHA256;
298
299	if (fct == HASH_UNKNOWN) {
300		warnx("Unsupported hashing function: %s", function);
301		return (NULL);
302	}
303
304	f = calloc(1, sizeof(struct fingerprint));
305	f->type = fct;
306	strlcpy(f->hash, fp, sizeof(f->hash));
307
308	return (f);
309}
310
311static void
312free_fingerprint_list(struct fingerprint_list* list)
313{
314	struct fingerprint *fingerprint, *tmp;
315
316	STAILQ_FOREACH_SAFE(fingerprint, list, next, tmp) {
317		free(fingerprint->name);
318		free(fingerprint);
319	}
320	free(list);
321}
322
323static struct fingerprint *
324load_fingerprint(const char *dir, const char *filename)
325{
326	ucl_object_t *obj = NULL;
327	struct ucl_parser *p = NULL;
328	struct fingerprint *f;
329	char path[MAXPATHLEN];
330
331	f = NULL;
332
333	snprintf(path, MAXPATHLEN, "%s/%s", dir, filename);
334
335	p = ucl_parser_new(0);
336	if (!ucl_parser_add_file(p, path)) {
337		warnx("%s: %s", path, ucl_parser_get_error(p));
338		ucl_parser_free(p);
339		return (NULL);
340	}
341
342	obj = ucl_parser_get_object(p);
343
344	if (obj->type == UCL_OBJECT)
345		f = parse_fingerprint(obj);
346
347	if (f != NULL)
348		f->name = strdup(filename);
349
350	ucl_object_unref(obj);
351	ucl_parser_free(p);
352
353	return (f);
354}
355
356static struct fingerprint_list *
357load_fingerprints(const char *path, int *count)
358{
359	DIR *d;
360	struct dirent *ent;
361	struct fingerprint *finger;
362	struct fingerprint_list *fingerprints;
363
364	*count = 0;
365
366	fingerprints = calloc(1, sizeof(struct fingerprint_list));
367	if (fingerprints == NULL)
368		return (NULL);
369	STAILQ_INIT(fingerprints);
370
371	if ((d = opendir(path)) == NULL) {
372		free(fingerprints);
373
374		return (NULL);
375	}
376
377	while ((ent = readdir(d))) {
378		if (strcmp(ent->d_name, ".") == 0 ||
379		    strcmp(ent->d_name, "..") == 0)
380			continue;
381		finger = load_fingerprint(path, ent->d_name);
382		if (finger != NULL) {
383			STAILQ_INSERT_TAIL(fingerprints, finger, next);
384			++(*count);
385		}
386	}
387
388	closedir(d);
389
390	return (fingerprints);
391}
392
393static void
394sha256_hash(unsigned char hash[SHA256_DIGEST_LENGTH],
395    char out[SHA256_DIGEST_LENGTH * 2 + 1])
396{
397	int i;
398
399	for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
400		sprintf(out + (i * 2), "%02x", hash[i]);
401
402	out[SHA256_DIGEST_LENGTH * 2] = '\0';
403}
404
405static void
406sha256_buf(char *buf, size_t len, char out[SHA256_DIGEST_LENGTH * 2 + 1])
407{
408	unsigned char hash[SHA256_DIGEST_LENGTH];
409	SHA256_CTX sha256;
410
411	out[0] = '\0';
412
413	SHA256_Init(&sha256);
414	SHA256_Update(&sha256, buf, len);
415	SHA256_Final(hash, &sha256);
416	sha256_hash(hash, out);
417}
418
419static int
420sha256_fd(int fd, char out[SHA256_DIGEST_LENGTH * 2 + 1])
421{
422	int my_fd;
423	FILE *fp;
424	char buffer[BUFSIZ];
425	unsigned char hash[SHA256_DIGEST_LENGTH];
426	size_t r;
427	int ret;
428	SHA256_CTX sha256;
429
430	my_fd = -1;
431	fp = NULL;
432	r = 0;
433	ret = 1;
434
435	out[0] = '\0';
436
437	/* Duplicate the fd so that fclose(3) does not close it. */
438	if ((my_fd = dup(fd)) == -1) {
439		warnx("dup");
440		goto cleanup;
441	}
442
443	if ((fp = fdopen(my_fd, "rb")) == NULL) {
444		warnx("fdopen");
445		goto cleanup;
446	}
447
448	SHA256_Init(&sha256);
449
450	while ((r = fread(buffer, 1, BUFSIZ, fp)) > 0)
451		SHA256_Update(&sha256, buffer, r);
452
453	if (ferror(fp) != 0) {
454		warnx("fread");
455		goto cleanup;
456	}
457
458	SHA256_Final(hash, &sha256);
459	sha256_hash(hash, out);
460	ret = 0;
461
462cleanup:
463	if (fp != NULL)
464		fclose(fp);
465	else if (my_fd != -1)
466		close(my_fd);
467	(void)lseek(fd, 0, SEEK_SET);
468
469	return (ret);
470}
471
472static EVP_PKEY *
473load_public_key_buf(const unsigned char *cert, int certlen)
474{
475	EVP_PKEY *pkey;
476	BIO *bp;
477	char errbuf[1024];
478
479	bp = BIO_new_mem_buf(__DECONST(void *, cert), certlen);
480
481	if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
482		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
483
484	BIO_free(bp);
485
486	return (pkey);
487}
488
489static bool
490rsa_verify_cert(int fd, const unsigned char *key, int keylen,
491    unsigned char *sig, int siglen)
492{
493	EVP_MD_CTX *mdctx;
494	EVP_PKEY *pkey;
495	char sha256[(SHA256_DIGEST_LENGTH * 2) + 2];
496	char errbuf[1024];
497	bool ret;
498
499	pkey = NULL;
500	mdctx = NULL;
501	ret = false;
502
503	/* Compute SHA256 of the package. */
504	if (lseek(fd, 0, 0) == -1) {
505		warn("lseek");
506		goto cleanup;
507	}
508	if ((sha256_fd(fd, sha256)) == -1) {
509		warnx("Error creating SHA256 hash for package");
510		goto cleanup;
511	}
512
513	if ((pkey = load_public_key_buf(key, keylen)) == NULL) {
514		warnx("Error reading public key");
515		goto cleanup;
516	}
517
518	/* Verify signature of the SHA256(pkg) is valid. */
519	if ((mdctx = EVP_MD_CTX_create()) == NULL) {
520		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
521		goto error;
522	}
523
524	if (EVP_DigestVerifyInit(mdctx, NULL, EVP_sha256(), NULL, pkey) != 1) {
525		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
526		goto error;
527	}
528	if (EVP_DigestVerifyUpdate(mdctx, sha256, strlen(sha256)) != 1) {
529		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
530		goto error;
531	}
532
533	if (EVP_DigestVerifyFinal(mdctx, sig, siglen) != 1) {
534		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
535		goto error;
536	}
537
538	ret = true;
539	printf("done\n");
540	goto cleanup;
541
542error:
543	printf("failed\n");
544
545cleanup:
546	if (pkey)
547		EVP_PKEY_free(pkey);
548	if (mdctx)
549		EVP_MD_CTX_destroy(mdctx);
550	ERR_free_strings();
551
552	return (ret);
553}
554
555static struct sig_cert *
556parse_cert(int fd) {
557	int my_fd;
558	struct sig_cert *sc;
559	FILE *fp;
560	struct sbuf *buf, *sig, *cert;
561	char *line;
562	size_t linecap;
563	ssize_t linelen;
564
565	buf = NULL;
566	my_fd = -1;
567	sc = NULL;
568	line = NULL;
569	linecap = 0;
570
571	if (lseek(fd, 0, 0) == -1) {
572		warn("lseek");
573		return (NULL);
574	}
575
576	/* Duplicate the fd so that fclose(3) does not close it. */
577	if ((my_fd = dup(fd)) == -1) {
578		warnx("dup");
579		return (NULL);
580	}
581
582	if ((fp = fdopen(my_fd, "rb")) == NULL) {
583		warn("fdopen");
584		close(my_fd);
585		return (NULL);
586	}
587
588	sig = sbuf_new_auto();
589	cert = sbuf_new_auto();
590
591	while ((linelen = getline(&line, &linecap, fp)) > 0) {
592		if (strcmp(line, "SIGNATURE\n") == 0) {
593			buf = sig;
594			continue;
595		} else if (strcmp(line, "CERT\n") == 0) {
596			buf = cert;
597			continue;
598		} else if (strcmp(line, "END\n") == 0) {
599			break;
600		}
601		if (buf != NULL)
602			sbuf_bcat(buf, line, linelen);
603	}
604
605	fclose(fp);
606
607	/* Trim out unrelated trailing newline */
608	sbuf_setpos(sig, sbuf_len(sig) - 1);
609
610	sbuf_finish(sig);
611	sbuf_finish(cert);
612
613	sc = calloc(1, sizeof(struct sig_cert));
614	sc->siglen = sbuf_len(sig);
615	sc->sig = calloc(1, sc->siglen);
616	memcpy(sc->sig, sbuf_data(sig), sc->siglen);
617
618	sc->certlen = sbuf_len(cert);
619	sc->cert = strdup(sbuf_data(cert));
620
621	sbuf_delete(sig);
622	sbuf_delete(cert);
623
624	return (sc);
625}
626
627static bool
628verify_signature(int fd_pkg, int fd_sig)
629{
630	struct fingerprint_list *trusted, *revoked;
631	struct fingerprint *fingerprint;
632	struct sig_cert *sc;
633	bool ret;
634	int trusted_count, revoked_count;
635	const char *fingerprints;
636	char path[MAXPATHLEN];
637	char hash[SHA256_DIGEST_LENGTH * 2 + 1];
638
639	sc = NULL;
640	trusted = revoked = NULL;
641	ret = false;
642
643	/* Read and parse fingerprints. */
644	if (config_string(FINGERPRINTS, &fingerprints) != 0) {
645		warnx("No CONFIG_FINGERPRINTS defined");
646		goto cleanup;
647	}
648
649	snprintf(path, MAXPATHLEN, "%s/trusted", fingerprints);
650	if ((trusted = load_fingerprints(path, &trusted_count)) == NULL) {
651		warnx("Error loading trusted certificates");
652		goto cleanup;
653	}
654
655	if (trusted_count == 0 || trusted == NULL) {
656		fprintf(stderr, "No trusted certificates found.\n");
657		goto cleanup;
658	}
659
660	snprintf(path, MAXPATHLEN, "%s/revoked", fingerprints);
661	if ((revoked = load_fingerprints(path, &revoked_count)) == NULL) {
662		warnx("Error loading revoked certificates");
663		goto cleanup;
664	}
665
666	/* Read certificate and signature in. */
667	if ((sc = parse_cert(fd_sig)) == NULL) {
668		warnx("Error parsing certificate");
669		goto cleanup;
670	}
671	/* Explicitly mark as non-trusted until proven otherwise. */
672	sc->trusted = false;
673
674	/* Parse signature and pubkey out of the certificate */
675	sha256_buf(sc->cert, sc->certlen, hash);
676
677	/* Check if this hash is revoked */
678	if (revoked != NULL) {
679		STAILQ_FOREACH(fingerprint, revoked, next) {
680			if (strcasecmp(fingerprint->hash, hash) == 0) {
681				fprintf(stderr, "The package was signed with "
682				    "revoked certificate %s\n",
683				    fingerprint->name);
684				goto cleanup;
685			}
686		}
687	}
688
689	STAILQ_FOREACH(fingerprint, trusted, next) {
690		if (strcasecmp(fingerprint->hash, hash) == 0) {
691			sc->trusted = true;
692			sc->name = strdup(fingerprint->name);
693			break;
694		}
695	}
696
697	if (sc->trusted == false) {
698		fprintf(stderr, "No trusted fingerprint found matching "
699		    "package's certificate\n");
700		goto cleanup;
701	}
702
703	/* Verify the signature. */
704	printf("Verifying signature with trusted certificate %s... ", sc->name);
705	if (rsa_verify_cert(fd_pkg, sc->cert, sc->certlen, sc->sig,
706	    sc->siglen) == false) {
707		fprintf(stderr, "Signature is not valid\n");
708		goto cleanup;
709	}
710
711	ret = true;
712
713cleanup:
714	if (trusted)
715		free_fingerprint_list(trusted);
716	if (revoked)
717		free_fingerprint_list(revoked);
718	if (sc) {
719		free(sc->cert);
720		free(sc->sig);
721		free(sc->name);
722		free(sc);
723	}
724
725	return (ret);
726}
727
728static int
729bootstrap_pkg(bool force)
730{
731	int fd_pkg, fd_sig;
732	int ret;
733	char url[MAXPATHLEN];
734	char tmppkg[MAXPATHLEN];
735	char tmpsig[MAXPATHLEN];
736	const char *packagesite;
737	const char *signature_type;
738	char pkgstatic[MAXPATHLEN];
739
740	fd_sig = -1;
741	ret = -1;
742
743	if (config_string(PACKAGESITE, &packagesite) != 0) {
744		warnx("No PACKAGESITE defined");
745		return (-1);
746	}
747
748	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
749		warnx("Error looking up SIGNATURE_TYPE");
750		return (-1);
751	}
752
753	printf("Bootstrapping pkg from %s, please wait...\n", packagesite);
754
755	/* Support pkg+http:// for PACKAGESITE which is the new format
756	   in 1.2 to avoid confusion on why http://pkg.FreeBSD.org has
757	   no A record. */
758	if (strncmp(URL_SCHEME_PREFIX, packagesite,
759	    strlen(URL_SCHEME_PREFIX)) == 0)
760		packagesite += strlen(URL_SCHEME_PREFIX);
761	snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz", packagesite);
762
763	snprintf(tmppkg, MAXPATHLEN, "%s/pkg.txz.XXXXXX",
764	    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
765
766	if ((fd_pkg = fetch_to_fd(url, tmppkg)) == -1)
767		goto fetchfail;
768
769	if (signature_type != NULL &&
770	    strcasecmp(signature_type, "FINGERPRINTS") == 0) {
771		snprintf(tmpsig, MAXPATHLEN, "%s/pkg.txz.sig.XXXXXX",
772		    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP);
773		snprintf(url, MAXPATHLEN, "%s/Latest/pkg.txz.sig",
774		    packagesite);
775
776		if ((fd_sig = fetch_to_fd(url, tmpsig)) == -1) {
777			fprintf(stderr, "Signature for pkg not available.\n");
778			goto fetchfail;
779		}
780
781		if (verify_signature(fd_pkg, fd_sig) == false)
782			goto cleanup;
783	}
784
785	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
786		ret = install_pkg_static(pkgstatic, tmppkg, force);
787
788	goto cleanup;
789
790fetchfail:
791	warnx("Error fetching %s: %s", url, fetchLastErrString);
792	fprintf(stderr, "A pre-built version of pkg could not be found for "
793	    "your system.\n");
794	fprintf(stderr, "Consider changing PACKAGESITE or installing it from "
795	    "ports: 'ports-mgmt/pkg'.\n");
796
797cleanup:
798	if (fd_sig != -1) {
799		close(fd_sig);
800		unlink(tmpsig);
801	}
802
803	if (fd_pkg != -1) {
804		close(fd_pkg);
805		unlink(tmppkg);
806	}
807
808	return (ret);
809}
810
811static const char confirmation_message[] =
812"The package management tool is not yet installed on your system.\n"
813"Do you want to fetch and install it now? [y/N]: ";
814
815static const char non_interactive_message[] =
816"The package management tool is not yet installed on your system.\n"
817"Please set ASSUME_ALWAYS_YES=yes environment variable to be able to bootstrap "
818"in non-interactive (stdin not being a tty)\n";
819
820static int
821pkg_query_yes_no(void)
822{
823	int ret, c;
824
825	c = getchar();
826
827	if (c == 'y' || c == 'Y')
828		ret = 1;
829	else
830		ret = 0;
831
832	while (c != '\n' && c != EOF)
833		c = getchar();
834
835	return (ret);
836}
837
838static int
839bootstrap_pkg_local(const char *pkgpath, bool force)
840{
841	char path[MAXPATHLEN];
842	char pkgstatic[MAXPATHLEN];
843	const char *signature_type;
844	int fd_pkg, fd_sig, ret;
845
846	fd_sig = -1;
847	ret = -1;
848
849	fd_pkg = open(pkgpath, O_RDONLY);
850	if (fd_pkg == -1)
851		err(EXIT_FAILURE, "Unable to open %s", pkgpath);
852
853	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
854		warnx("Error looking up SIGNATURE_TYPE");
855		goto cleanup;
856	}
857	if (signature_type != NULL &&
858	    strcasecmp(signature_type, "FINGERPRINTS") == 0) {
859		snprintf(path, sizeof(path), "%s.sig", pkgpath);
860
861		if ((fd_sig = open(path, O_RDONLY)) == -1) {
862			fprintf(stderr, "Signature for pkg not available.\n");
863			goto cleanup;
864		}
865
866		if (verify_signature(fd_pkg, fd_sig) == false)
867			goto cleanup;
868	}
869
870	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
871		ret = install_pkg_static(pkgstatic, pkgpath, force);
872
873cleanup:
874	close(fd_pkg);
875	if (fd_sig != -1)
876		close(fd_sig);
877
878	return (ret);
879}
880
881int
882main(int argc, char *argv[])
883{
884	char pkgpath[MAXPATHLEN];
885	const char *pkgarg;
886	bool bootstrap_only, force, yes;
887
888	bootstrap_only = false;
889	force = false;
890	pkgarg = NULL;
891	yes = false;
892
893	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg",
894	    getenv("LOCALBASE") ? getenv("LOCALBASE") : _LOCALBASE);
895
896	if (argc > 1 && strcmp(argv[1], "bootstrap") == 0) {
897		bootstrap_only = true;
898		if (argc == 3 && strcmp(argv[2], "-f") == 0)
899			force = true;
900	}
901
902	if ((bootstrap_only && force) || access(pkgpath, X_OK) == -1) {
903		/*
904		 * To allow 'pkg -N' to be used as a reliable test for whether
905		 * a system is configured to use pkg, don't bootstrap pkg
906		 * when that argument is given as argv[1].
907		 */
908		if (argv[1] != NULL && strcmp(argv[1], "-N") == 0)
909			errx(EXIT_FAILURE, "pkg is not installed");
910
911		config_init();
912
913		if (argc > 1 && strcmp(argv[1], "add") == 0) {
914			if (argc > 2 && strcmp(argv[2], "-f") == 0) {
915				force = true;
916				pkgarg = argv[3];
917			} else
918				pkgarg = argv[2];
919			if (pkgarg == NULL) {
920				fprintf(stderr, "Path to pkg.txz required\n");
921				exit(EXIT_FAILURE);
922			}
923			if (access(pkgarg, R_OK) == -1) {
924				fprintf(stderr, "No such file: %s\n", pkgarg);
925				exit(EXIT_FAILURE);
926			}
927			if (bootstrap_pkg_local(pkgarg, force) != 0)
928				exit(EXIT_FAILURE);
929			exit(EXIT_SUCCESS);
930		}
931		/*
932		 * Do not ask for confirmation if either of stdin or stdout is
933		 * not tty. Check the environment to see if user has answer
934		 * tucked in there already.
935		 */
936		config_bool(ASSUME_ALWAYS_YES, &yes);
937		if (!yes) {
938			if (!isatty(fileno(stdin))) {
939				fprintf(stderr, non_interactive_message);
940				exit(EXIT_FAILURE);
941			}
942
943			printf("%s", confirmation_message);
944			if (pkg_query_yes_no() == 0)
945				exit(EXIT_FAILURE);
946		}
947		if (bootstrap_pkg(force) != 0)
948			exit(EXIT_FAILURE);
949		config_finish();
950
951		if (bootstrap_only)
952			exit(EXIT_SUCCESS);
953	} else if (bootstrap_only) {
954		printf("pkg already bootstrapped at %s\n", pkgpath);
955		exit(EXIT_SUCCESS);
956	}
957
958	execv(pkgpath, argv);
959
960	/* NOT REACHED */
961	return (EXIT_FAILURE);
962}
963