1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2012-2014 Baptiste Daroussin <bapt@FreeBSD.org>
5 * Copyright (c) 2013 Bryan Drewery <bdrewery@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include <sys/param.h>
34#include <sys/queue.h>
35#include <sys/types.h>
36#include <sys/wait.h>
37
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 <getopt.h>
46#include <libutil.h>
47#include <paths.h>
48#include <stdbool.h>
49#include <stdlib.h>
50#include <stdio.h>
51#include <string.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
69struct pubkey {
70	unsigned char *sig;
71	int siglen;
72};
73
74typedef enum {
75	HASH_UNKNOWN,
76	HASH_SHA256,
77} hash_t;
78
79struct fingerprint {
80	hash_t type;
81	char *name;
82	char hash[BUFSIZ];
83	STAILQ_ENTRY(fingerprint) next;
84};
85
86static const char *bootstrap_names []  = {
87	"pkg.pkg",
88	"pkg.txz",
89	NULL
90};
91
92STAILQ_HEAD(fingerprint_list, fingerprint);
93
94static int
95extract_pkg_static(int fd, char *p, int sz)
96{
97	struct archive *a;
98	struct archive_entry *ae;
99	char *end;
100	int ret, r;
101
102	ret = -1;
103	a = archive_read_new();
104	if (a == NULL) {
105		warn("archive_read_new");
106		return (ret);
107	}
108	archive_read_support_filter_all(a);
109	archive_read_support_format_tar(a);
110
111	if (lseek(fd, 0, 0) == -1) {
112		warn("lseek");
113		goto cleanup;
114	}
115
116	if (archive_read_open_fd(a, fd, 4096) != ARCHIVE_OK) {
117		warnx("archive_read_open_fd: %s", archive_error_string(a));
118		goto cleanup;
119	}
120
121	ae = NULL;
122	while ((r = archive_read_next_header(a, &ae)) == ARCHIVE_OK) {
123		end = strrchr(archive_entry_pathname(ae), '/');
124		if (end == NULL)
125			continue;
126
127		if (strcmp(end, "/pkg-static") == 0) {
128			r = archive_read_extract(a, ae,
129			    ARCHIVE_EXTRACT_OWNER | ARCHIVE_EXTRACT_PERM |
130			    ARCHIVE_EXTRACT_TIME | ARCHIVE_EXTRACT_ACL |
131			    ARCHIVE_EXTRACT_FFLAGS | ARCHIVE_EXTRACT_XATTR);
132			strlcpy(p, archive_entry_pathname(ae), sz);
133			break;
134		}
135	}
136
137	if (r == ARCHIVE_OK)
138		ret = 0;
139	else
140		warnx("failed to extract pkg-static: %s",
141		    archive_error_string(a));
142
143cleanup:
144	archive_read_free(a);
145	return (ret);
146
147}
148
149static int
150install_pkg_static(const char *path, const char *pkgpath, bool force)
151{
152	int pstat;
153	pid_t pid;
154
155	switch ((pid = fork())) {
156	case -1:
157		return (-1);
158	case 0:
159		if (force)
160			execl(path, "pkg-static", "add", "-f", pkgpath,
161			    (char *)NULL);
162		else
163			execl(path, "pkg-static", "add", pkgpath,
164			    (char *)NULL);
165		_exit(1);
166	default:
167		break;
168	}
169
170	while (waitpid(pid, &pstat, 0) == -1)
171		if (errno != EINTR)
172			return (-1);
173
174	if (WEXITSTATUS(pstat))
175		return (WEXITSTATUS(pstat));
176	else if (WIFSIGNALED(pstat))
177		return (128 & (WTERMSIG(pstat)));
178	return (pstat);
179}
180
181static int
182fetch_to_fd(const char *url, char *path, const char *fetchOpts)
183{
184	struct url *u;
185	struct dns_srvinfo *mirrors, *current;
186	struct url_stat st;
187	FILE *remote;
188	/* To store _https._tcp. + hostname + \0 */
189	int fd;
190	int retry, max_retry;
191	ssize_t r;
192	char buf[10240];
193	char zone[MAXHOSTNAMELEN + 13];
194	static const char *mirror_type = NULL;
195
196	max_retry = 3;
197	current = mirrors = NULL;
198	remote = NULL;
199
200	if (mirror_type == NULL && config_string(MIRROR_TYPE, &mirror_type)
201	    != 0) {
202		warnx("No MIRROR_TYPE defined");
203		return (-1);
204	}
205
206	if ((fd = mkstemp(path)) == -1) {
207		warn("mkstemp()");
208		return (-1);
209	}
210
211	retry = max_retry;
212
213	if ((u = fetchParseURL(url)) == NULL) {
214		warn("fetchParseURL('%s')", url);
215		return (-1);
216	}
217
218	while (remote == NULL) {
219		if (retry == max_retry) {
220			if (strcmp(u->scheme, "file") != 0 &&
221			    strcasecmp(mirror_type, "srv") == 0) {
222				snprintf(zone, sizeof(zone),
223				    "_%s._tcp.%s", u->scheme, u->host);
224				mirrors = dns_getsrvinfo(zone);
225				current = mirrors;
226			}
227		}
228
229		if (mirrors != NULL) {
230			strlcpy(u->host, current->host, sizeof(u->host));
231			u->port = current->port;
232		}
233
234		remote = fetchXGet(u, &st, fetchOpts);
235		if (remote == NULL) {
236			--retry;
237			if (retry <= 0)
238				goto fetchfail;
239			if (mirrors == NULL) {
240				sleep(1);
241			} else {
242				current = current->next;
243				if (current == NULL)
244					current = mirrors;
245			}
246		}
247	}
248
249	while ((r = fread(buf, 1, sizeof(buf), remote)) > 0) {
250		if (write(fd, buf, r) != r) {
251			warn("write()");
252			goto fetchfail;
253		}
254	}
255
256	if (r != 0) {
257		warn("An error occurred while fetching pkg(8)");
258		goto fetchfail;
259	}
260
261	if (ferror(remote))
262		goto fetchfail;
263
264	goto cleanup;
265
266fetchfail:
267	if (fd != -1) {
268		close(fd);
269		fd = -1;
270		unlink(path);
271	}
272
273cleanup:
274	if (remote != NULL)
275		fclose(remote);
276
277	return fd;
278}
279
280static struct fingerprint *
281parse_fingerprint(ucl_object_t *obj)
282{
283	const ucl_object_t *cur;
284	ucl_object_iter_t it = NULL;
285	const char *function, *fp, *key;
286	struct fingerprint *f;
287	hash_t fct = HASH_UNKNOWN;
288
289	function = fp = NULL;
290
291	while ((cur = ucl_iterate_object(obj, &it, true))) {
292		key = ucl_object_key(cur);
293		if (cur->type != UCL_STRING)
294			continue;
295		if (strcasecmp(key, "function") == 0) {
296			function = ucl_object_tostring(cur);
297			continue;
298		}
299		if (strcasecmp(key, "fingerprint") == 0) {
300			fp = ucl_object_tostring(cur);
301			continue;
302		}
303	}
304
305	if (fp == NULL || function == NULL)
306		return (NULL);
307
308	if (strcasecmp(function, "sha256") == 0)
309		fct = HASH_SHA256;
310
311	if (fct == HASH_UNKNOWN) {
312		warnx("Unsupported hashing function: %s", function);
313		return (NULL);
314	}
315
316	f = calloc(1, sizeof(struct fingerprint));
317	f->type = fct;
318	strlcpy(f->hash, fp, sizeof(f->hash));
319
320	return (f);
321}
322
323static void
324free_fingerprint_list(struct fingerprint_list* list)
325{
326	struct fingerprint *fingerprint, *tmp;
327
328	STAILQ_FOREACH_SAFE(fingerprint, list, next, tmp) {
329		free(fingerprint->name);
330		free(fingerprint);
331	}
332	free(list);
333}
334
335static struct fingerprint *
336load_fingerprint(const char *dir, const char *filename)
337{
338	ucl_object_t *obj = NULL;
339	struct ucl_parser *p = NULL;
340	struct fingerprint *f;
341	char path[MAXPATHLEN];
342
343	f = NULL;
344
345	snprintf(path, MAXPATHLEN, "%s/%s", dir, filename);
346
347	p = ucl_parser_new(0);
348	if (!ucl_parser_add_file(p, path)) {
349		warnx("%s: %s", path, ucl_parser_get_error(p));
350		ucl_parser_free(p);
351		return (NULL);
352	}
353
354	obj = ucl_parser_get_object(p);
355
356	if (obj->type == UCL_OBJECT)
357		f = parse_fingerprint(obj);
358
359	if (f != NULL)
360		f->name = strdup(filename);
361
362	ucl_object_unref(obj);
363	ucl_parser_free(p);
364
365	return (f);
366}
367
368static struct fingerprint_list *
369load_fingerprints(const char *path, int *count)
370{
371	DIR *d;
372	struct dirent *ent;
373	struct fingerprint *finger;
374	struct fingerprint_list *fingerprints;
375
376	*count = 0;
377
378	fingerprints = calloc(1, sizeof(struct fingerprint_list));
379	if (fingerprints == NULL)
380		return (NULL);
381	STAILQ_INIT(fingerprints);
382
383	if ((d = opendir(path)) == NULL) {
384		free(fingerprints);
385
386		return (NULL);
387	}
388
389	while ((ent = readdir(d))) {
390		if (strcmp(ent->d_name, ".") == 0 ||
391		    strcmp(ent->d_name, "..") == 0)
392			continue;
393		finger = load_fingerprint(path, ent->d_name);
394		if (finger != NULL) {
395			STAILQ_INSERT_TAIL(fingerprints, finger, next);
396			++(*count);
397		}
398	}
399
400	closedir(d);
401
402	return (fingerprints);
403}
404
405static void
406sha256_hash(unsigned char hash[SHA256_DIGEST_LENGTH],
407    char out[SHA256_DIGEST_LENGTH * 2 + 1])
408{
409	int i;
410
411	for (i = 0; i < SHA256_DIGEST_LENGTH; i++)
412		sprintf(out + (i * 2), "%02x", hash[i]);
413
414	out[SHA256_DIGEST_LENGTH * 2] = '\0';
415}
416
417static void
418sha256_buf(char *buf, size_t len, char out[SHA256_DIGEST_LENGTH * 2 + 1])
419{
420	unsigned char hash[SHA256_DIGEST_LENGTH];
421	SHA256_CTX sha256;
422
423	out[0] = '\0';
424
425	SHA256_Init(&sha256);
426	SHA256_Update(&sha256, buf, len);
427	SHA256_Final(hash, &sha256);
428	sha256_hash(hash, out);
429}
430
431static int
432sha256_fd(int fd, char out[SHA256_DIGEST_LENGTH * 2 + 1])
433{
434	int my_fd;
435	FILE *fp;
436	char buffer[BUFSIZ];
437	unsigned char hash[SHA256_DIGEST_LENGTH];
438	size_t r;
439	int ret;
440	SHA256_CTX sha256;
441
442	fp = NULL;
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 EVP_PKEY *
483load_public_key_file(const char *file)
484{
485	EVP_PKEY *pkey;
486	BIO *bp;
487	char errbuf[1024];
488
489	bp = BIO_new_file(file, "r");
490	if (!bp)
491		errx(EXIT_FAILURE, "Unable to read %s", file);
492
493	if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
494		warnx("ici: %s", ERR_error_string(ERR_get_error(), errbuf));
495
496	BIO_free(bp);
497
498	return (pkey);
499}
500
501static EVP_PKEY *
502load_public_key_buf(const unsigned char *cert, int certlen)
503{
504	EVP_PKEY *pkey;
505	BIO *bp;
506	char errbuf[1024];
507
508	bp = BIO_new_mem_buf(__DECONST(void *, cert), certlen);
509
510	if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
511		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
512
513	BIO_free(bp);
514
515	return (pkey);
516}
517
518static bool
519rsa_verify_cert(int fd, const char *sigfile, const unsigned char *key,
520    int keylen, unsigned char *sig, int siglen)
521{
522	EVP_MD_CTX *mdctx;
523	EVP_PKEY *pkey;
524	char sha256[(SHA256_DIGEST_LENGTH * 2) + 2];
525	char errbuf[1024];
526	bool ret;
527
528	pkey = NULL;
529	mdctx = NULL;
530	ret = false;
531
532	SSL_load_error_strings();
533
534	/* Compute SHA256 of the package. */
535	if (lseek(fd, 0, 0) == -1) {
536		warn("lseek");
537		goto cleanup;
538	}
539	if ((sha256_fd(fd, sha256)) == -1) {
540		warnx("Error creating SHA256 hash for package");
541		goto cleanup;
542	}
543
544	if (sigfile != NULL) {
545		if ((pkey = load_public_key_file(sigfile)) == NULL) {
546			warnx("Error reading public key");
547			goto cleanup;
548		}
549	} else {
550		if ((pkey = load_public_key_buf(key, keylen)) == NULL) {
551			warnx("Error reading public key");
552			goto cleanup;
553		}
554	}
555
556	/* Verify signature of the SHA256(pkg) is valid. */
557	if ((mdctx = EVP_MD_CTX_create()) == NULL) {
558		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
559		goto error;
560	}
561
562	if (EVP_DigestVerifyInit(mdctx, NULL, EVP_sha256(), NULL, pkey) != 1) {
563		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
564		goto error;
565	}
566	if (EVP_DigestVerifyUpdate(mdctx, sha256, strlen(sha256)) != 1) {
567		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
568		goto error;
569	}
570
571	if (EVP_DigestVerifyFinal(mdctx, sig, siglen) != 1) {
572		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
573		goto error;
574	}
575
576	ret = true;
577	printf("done\n");
578	goto cleanup;
579
580error:
581	printf("failed\n");
582
583cleanup:
584	if (pkey)
585		EVP_PKEY_free(pkey);
586	if (mdctx)
587		EVP_MD_CTX_destroy(mdctx);
588	ERR_free_strings();
589
590	return (ret);
591}
592
593static struct pubkey *
594read_pubkey(int fd)
595{
596	struct pubkey *pk;
597	char *sigb;
598	size_t sigsz;
599	FILE *sig;
600	char buf[4096];
601	int r;
602
603	if (lseek(fd, 0, 0) == -1) {
604		warn("lseek");
605		return (NULL);
606	}
607
608	sigsz = 0;
609	sigb = NULL;
610	sig = open_memstream(&sigb, &sigsz);
611	if (sig == NULL)
612		err(EXIT_FAILURE, "open_memstream()");
613
614	while ((r = read(fd, buf, sizeof(buf))) >0) {
615		fwrite(buf, 1, r, sig);
616	}
617
618	fclose(sig);
619	pk = calloc(1, sizeof(struct pubkey));
620	pk->siglen = sigsz;
621	pk->sig = calloc(1, pk->siglen);
622	memcpy(pk->sig, sigb, pk->siglen);
623	free(sigb);
624
625	return (pk);
626}
627
628static struct sig_cert *
629parse_cert(int fd) {
630	int my_fd;
631	struct sig_cert *sc;
632	FILE *fp, *sigfp, *certfp, *tmpfp;
633	char *line;
634	char *sig, *cert;
635	size_t linecap, sigsz, certsz;
636	ssize_t linelen;
637
638	sc = NULL;
639	line = NULL;
640	linecap = 0;
641	sig = cert = NULL;
642	sigfp = certfp = tmpfp = NULL;
643
644	if (lseek(fd, 0, 0) == -1) {
645		warn("lseek");
646		return (NULL);
647	}
648
649	/* Duplicate the fd so that fclose(3) does not close it. */
650	if ((my_fd = dup(fd)) == -1) {
651		warnx("dup");
652		return (NULL);
653	}
654
655	if ((fp = fdopen(my_fd, "rb")) == NULL) {
656		warn("fdopen");
657		close(my_fd);
658		return (NULL);
659	}
660
661	sigsz = certsz = 0;
662	sigfp = open_memstream(&sig, &sigsz);
663	if (sigfp == NULL)
664		err(EXIT_FAILURE, "open_memstream()");
665	certfp = open_memstream(&cert, &certsz);
666	if (certfp == NULL)
667		err(EXIT_FAILURE, "open_memstream()");
668
669	while ((linelen = getline(&line, &linecap, fp)) > 0) {
670		if (strcmp(line, "SIGNATURE\n") == 0) {
671			tmpfp = sigfp;
672			continue;
673		} else if (strcmp(line, "CERT\n") == 0) {
674			tmpfp = certfp;
675			continue;
676		} else if (strcmp(line, "END\n") == 0) {
677			break;
678		}
679		if (tmpfp != NULL)
680			fwrite(line, 1, linelen, tmpfp);
681	}
682
683	fclose(fp);
684	fclose(sigfp);
685	fclose(certfp);
686
687	sc = calloc(1, sizeof(struct sig_cert));
688	sc->siglen = sigsz -1; /* Trim out unrelated trailing newline */
689	sc->sig = sig;
690
691	sc->certlen = certsz;
692	sc->cert = cert;
693
694	return (sc);
695}
696
697static bool
698verify_pubsignature(int fd_pkg, int fd_sig)
699{
700	struct pubkey *pk;
701	const char *pubkey;
702	bool ret;
703
704	pk = NULL;
705	pubkey = NULL;
706	ret = false;
707	if (config_string(PUBKEY, &pubkey) != 0) {
708		warnx("No CONFIG_PUBKEY defined");
709		goto cleanup;
710	}
711
712	if ((pk = read_pubkey(fd_sig)) == NULL) {
713		warnx("Error reading signature");
714		goto cleanup;
715	}
716
717	/* Verify the signature. */
718	printf("Verifying signature with public key %s... ", pubkey);
719	if (rsa_verify_cert(fd_pkg, pubkey, NULL, 0, pk->sig,
720	    pk->siglen) == false) {
721		fprintf(stderr, "Signature is not valid\n");
722		goto cleanup;
723	}
724
725	ret = true;
726
727cleanup:
728	if (pk) {
729		free(pk->sig);
730		free(pk);
731	}
732
733	return (ret);
734}
735
736static bool
737verify_signature(int fd_pkg, int fd_sig)
738{
739	struct fingerprint_list *trusted, *revoked;
740	struct fingerprint *fingerprint;
741	struct sig_cert *sc;
742	bool ret;
743	int trusted_count, revoked_count;
744	const char *fingerprints;
745	char path[MAXPATHLEN];
746	char hash[SHA256_DIGEST_LENGTH * 2 + 1];
747
748	sc = NULL;
749	trusted = revoked = NULL;
750	ret = false;
751
752	/* Read and parse fingerprints. */
753	if (config_string(FINGERPRINTS, &fingerprints) != 0) {
754		warnx("No CONFIG_FINGERPRINTS defined");
755		goto cleanup;
756	}
757
758	snprintf(path, MAXPATHLEN, "%s/trusted", fingerprints);
759	if ((trusted = load_fingerprints(path, &trusted_count)) == NULL) {
760		warnx("Error loading trusted certificates");
761		goto cleanup;
762	}
763
764	if (trusted_count == 0 || trusted == NULL) {
765		fprintf(stderr, "No trusted certificates found.\n");
766		goto cleanup;
767	}
768
769	snprintf(path, MAXPATHLEN, "%s/revoked", fingerprints);
770	if ((revoked = load_fingerprints(path, &revoked_count)) == NULL) {
771		warnx("Error loading revoked certificates");
772		goto cleanup;
773	}
774
775	/* Read certificate and signature in. */
776	if ((sc = parse_cert(fd_sig)) == NULL) {
777		warnx("Error parsing certificate");
778		goto cleanup;
779	}
780	/* Explicitly mark as non-trusted until proven otherwise. */
781	sc->trusted = false;
782
783	/* Parse signature and pubkey out of the certificate */
784	sha256_buf(sc->cert, sc->certlen, hash);
785
786	/* Check if this hash is revoked */
787	if (revoked != NULL) {
788		STAILQ_FOREACH(fingerprint, revoked, next) {
789			if (strcasecmp(fingerprint->hash, hash) == 0) {
790				fprintf(stderr, "The package was signed with "
791				    "revoked certificate %s\n",
792				    fingerprint->name);
793				goto cleanup;
794			}
795		}
796	}
797
798	STAILQ_FOREACH(fingerprint, trusted, next) {
799		if (strcasecmp(fingerprint->hash, hash) == 0) {
800			sc->trusted = true;
801			sc->name = strdup(fingerprint->name);
802			break;
803		}
804	}
805
806	if (sc->trusted == false) {
807		fprintf(stderr, "No trusted fingerprint found matching "
808		    "package's certificate\n");
809		goto cleanup;
810	}
811
812	/* Verify the signature. */
813	printf("Verifying signature with trusted certificate %s... ", sc->name);
814	if (rsa_verify_cert(fd_pkg, NULL, sc->cert, sc->certlen, sc->sig,
815	    sc->siglen) == false) {
816		fprintf(stderr, "Signature is not valid\n");
817		goto cleanup;
818	}
819
820	ret = true;
821
822cleanup:
823	if (trusted)
824		free_fingerprint_list(trusted);
825	if (revoked)
826		free_fingerprint_list(revoked);
827	if (sc) {
828		free(sc->cert);
829		free(sc->sig);
830		free(sc->name);
831		free(sc);
832	}
833
834	return (ret);
835}
836
837static int
838bootstrap_pkg(bool force, const char *fetchOpts)
839{
840	int fd_pkg, fd_sig;
841	int ret;
842	char url[MAXPATHLEN];
843	char tmppkg[MAXPATHLEN];
844	char tmpsig[MAXPATHLEN];
845	const char *packagesite;
846	const char *signature_type;
847	char pkgstatic[MAXPATHLEN];
848	const char *bootstrap_name;
849
850	fd_sig = -1;
851	ret = -1;
852
853	if (config_string(PACKAGESITE, &packagesite) != 0) {
854		warnx("No PACKAGESITE defined");
855		return (-1);
856	}
857
858	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
859		warnx("Error looking up SIGNATURE_TYPE");
860		return (-1);
861	}
862
863	printf("Bootstrapping pkg from %s, please wait...\n", packagesite);
864
865	/* Support pkg+http:// for PACKAGESITE which is the new format
866	   in 1.2 to avoid confusion on why http://pkg.FreeBSD.org has
867	   no A record. */
868	if (strncmp(URL_SCHEME_PREFIX, packagesite,
869	    strlen(URL_SCHEME_PREFIX)) == 0)
870		packagesite += strlen(URL_SCHEME_PREFIX);
871	for (int j = 0; bootstrap_names[j] != NULL; j++) {
872		bootstrap_name = bootstrap_names[j];
873
874		snprintf(url, MAXPATHLEN, "%s/Latest/%s", packagesite, bootstrap_name);
875		snprintf(tmppkg, MAXPATHLEN, "%s/%s.XXXXXX",
876		    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP,
877		    bootstrap_name);
878		if ((fd_pkg = fetch_to_fd(url, tmppkg, fetchOpts)) != -1)
879			break;
880		bootstrap_name = NULL;
881	}
882	if (bootstrap_name == NULL)
883		goto fetchfail;
884
885	if (signature_type != NULL &&
886	    strcasecmp(signature_type, "NONE") != 0) {
887		if (strcasecmp(signature_type, "FINGERPRINTS") == 0) {
888
889			snprintf(tmpsig, MAXPATHLEN, "%s/%s.sig.XXXXXX",
890			    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP,
891			    bootstrap_name);
892			snprintf(url, MAXPATHLEN, "%s/Latest/%s.sig",
893			    packagesite, bootstrap_name);
894
895			if ((fd_sig = fetch_to_fd(url, tmpsig, fetchOpts)) == -1) {
896				fprintf(stderr, "Signature for pkg not "
897				    "available.\n");
898				goto fetchfail;
899			}
900
901			if (verify_signature(fd_pkg, fd_sig) == false)
902				goto cleanup;
903		} else if (strcasecmp(signature_type, "PUBKEY") == 0) {
904
905			snprintf(tmpsig, MAXPATHLEN,
906			    "%s/%s.pubkeysig.XXXXXX",
907			    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP,
908			    bootstrap_name);
909			snprintf(url, MAXPATHLEN, "%s/Latest/%s.pubkeysig",
910			    packagesite, bootstrap_name);
911
912			if ((fd_sig = fetch_to_fd(url, tmpsig, fetchOpts)) == -1) {
913				fprintf(stderr, "Signature for pkg not "
914				    "available.\n");
915				goto fetchfail;
916			}
917
918			if (verify_pubsignature(fd_pkg, fd_sig) == false)
919				goto cleanup;
920		} else {
921			warnx("Signature type %s is not supported for "
922			    "bootstrapping.", signature_type);
923			goto cleanup;
924		}
925	}
926
927	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
928		ret = install_pkg_static(pkgstatic, tmppkg, force);
929
930	goto cleanup;
931
932fetchfail:
933	warnx("Error fetching %s: %s", url, fetchLastErrString);
934	if (fetchLastErrCode == FETCH_RESOLV) {
935		fprintf(stderr, "Address resolution failed for %s.\n", packagesite);
936		fprintf(stderr, "Consider changing PACKAGESITE.\n");
937	} else {
938		fprintf(stderr, "A pre-built version of pkg could not be found for "
939		    "your system.\n");
940		fprintf(stderr, "Consider changing PACKAGESITE or installing it from "
941		    "ports: 'ports-mgmt/pkg'.\n");
942	}
943
944cleanup:
945	if (fd_sig != -1) {
946		close(fd_sig);
947		unlink(tmpsig);
948	}
949
950	if (fd_pkg != -1) {
951		close(fd_pkg);
952		unlink(tmppkg);
953	}
954
955	return (ret);
956}
957
958static const char confirmation_message[] =
959"The package management tool is not yet installed on your system.\n"
960"Do you want to fetch and install it now? [y/N]: ";
961
962static const char non_interactive_message[] =
963"The package management tool is not yet installed on your system.\n"
964"Please set ASSUME_ALWAYS_YES=yes environment variable to be able to bootstrap "
965"in non-interactive (stdin not being a tty)\n";
966
967static const char args_bootstrap_message[] =
968"Too many arguments\n"
969"Usage: pkg [-4|-6] bootstrap [-f] [-y]\n";
970
971static const char args_add_message[] =
972"Too many arguments\n"
973"Usage: pkg add [-f] [-y] {pkg.txz}\n";
974
975static int
976pkg_query_yes_no(void)
977{
978	int ret, c;
979
980	fflush(stdout);
981	c = getchar();
982
983	if (c == 'y' || c == 'Y')
984		ret = 1;
985	else
986		ret = 0;
987
988	while (c != '\n' && c != EOF)
989		c = getchar();
990
991	return (ret);
992}
993
994static int
995bootstrap_pkg_local(const char *pkgpath, bool force)
996{
997	char path[MAXPATHLEN];
998	char pkgstatic[MAXPATHLEN];
999	const char *signature_type;
1000	int fd_pkg, fd_sig, ret;
1001
1002	fd_sig = -1;
1003	ret = -1;
1004
1005	fd_pkg = open(pkgpath, O_RDONLY);
1006	if (fd_pkg == -1)
1007		err(EXIT_FAILURE, "Unable to open %s", pkgpath);
1008
1009	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
1010		warnx("Error looking up SIGNATURE_TYPE");
1011		goto cleanup;
1012	}
1013	if (signature_type != NULL &&
1014	    strcasecmp(signature_type, "NONE") != 0) {
1015		if (strcasecmp(signature_type, "FINGERPRINTS") == 0) {
1016
1017			snprintf(path, sizeof(path), "%s.sig", pkgpath);
1018
1019			if ((fd_sig = open(path, O_RDONLY)) == -1) {
1020				fprintf(stderr, "Signature for pkg not "
1021				    "available.\n");
1022				goto cleanup;
1023			}
1024
1025			if (verify_signature(fd_pkg, fd_sig) == false)
1026				goto cleanup;
1027
1028		} else if (strcasecmp(signature_type, "PUBKEY") == 0) {
1029
1030			snprintf(path, sizeof(path), "%s.pubkeysig", pkgpath);
1031
1032			if ((fd_sig = open(path, O_RDONLY)) == -1) {
1033				fprintf(stderr, "Signature for pkg not "
1034				    "available.\n");
1035				goto cleanup;
1036			}
1037
1038			if (verify_pubsignature(fd_pkg, fd_sig) == false)
1039				goto cleanup;
1040
1041		} else {
1042			warnx("Signature type %s is not supported for "
1043			    "bootstrapping.", signature_type);
1044			goto cleanup;
1045		}
1046	}
1047
1048	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
1049		ret = install_pkg_static(pkgstatic, pkgpath, force);
1050
1051cleanup:
1052	close(fd_pkg);
1053	if (fd_sig != -1)
1054		close(fd_sig);
1055
1056	return (ret);
1057}
1058
1059int
1060main(int argc, char *argv[])
1061{
1062	char pkgpath[MAXPATHLEN];
1063	const char *pkgarg, *repo_name;
1064	bool activation_test, add_pkg, bootstrap_only, force, yes;
1065	signed char ch;
1066	const char *fetchOpts;
1067	char *command;
1068
1069	activation_test = false;
1070	add_pkg = false;
1071	bootstrap_only = false;
1072	command = NULL;
1073	fetchOpts = "";
1074	force = false;
1075	pkgarg = NULL;
1076	repo_name = NULL;
1077	yes = false;
1078
1079	struct option longopts[] = {
1080		{ "force",		no_argument,		NULL,	'f' },
1081		{ "only-ipv4",		no_argument,		NULL,	'4' },
1082		{ "only-ipv6",		no_argument,		NULL,	'6' },
1083		{ "yes",		no_argument,		NULL,	'y' },
1084		{ NULL,			0,			NULL,	0   },
1085	};
1086
1087	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg", getlocalbase());
1088
1089	while ((ch = getopt_long(argc, argv, "-:fr::yN46", longopts, NULL)) != -1) {
1090		switch (ch) {
1091		case 'f':
1092			force = true;
1093			break;
1094		case 'N':
1095			activation_test = true;
1096			break;
1097		case 'y':
1098			yes = true;
1099			break;
1100		case '4':
1101			fetchOpts = "4";
1102			break;
1103		case '6':
1104			fetchOpts = "6";
1105			break;
1106		case 'r':
1107			/*
1108			 * The repository can only be specified for an explicit
1109			 * bootstrap request at this time, so that we don't
1110			 * confuse the user if they're trying to use a verb that
1111			 * has some other conflicting meaning but we need to
1112			 * bootstrap.
1113			 *
1114			 * For that reason, we specify that -r has an optional
1115			 * argument above and process the next index ourselves.
1116			 * This is mostly significant because getopt(3) will
1117			 * otherwise eat the next argument, which could be
1118			 * something we need to try and make sense of.
1119			 *
1120			 * At worst this gets us false positives that we ignore
1121			 * in other contexts, and we have to do a little fudging
1122			 * in order to support separating -r from the reponame
1123			 * with a space since it's not actually optional in
1124			 * the bootstrap/add sense.
1125			 */
1126			if (add_pkg || bootstrap_only) {
1127				if (optarg != NULL) {
1128					repo_name = optarg;
1129				} else if (optind < argc) {
1130					repo_name = argv[optind];
1131				}
1132
1133				if (repo_name == NULL || *repo_name == '\0') {
1134					fprintf(stderr,
1135					    "Must specify a repository with -r!\n");
1136					exit(EXIT_FAILURE);
1137				}
1138
1139				if (optarg == NULL) {
1140					/* Advance past repo name. */
1141					optreset = 1;
1142					optind++;
1143				}
1144			}
1145			break;
1146		case 1:
1147			// Non-option arguments, first one is the command
1148			if (command == NULL) {
1149				command = argv[optind-1];
1150				if (strcmp(command, "add") == 0) {
1151					add_pkg = true;
1152				}
1153				else if (strcmp(command, "bootstrap") == 0) {
1154					bootstrap_only = true;
1155				}
1156			}
1157			// bootstrap doesn't accept other arguments
1158			else if (bootstrap_only) {
1159				fprintf(stderr, args_bootstrap_message);
1160				exit(EXIT_FAILURE);
1161			}
1162			// For add, we accept exactly one further argument
1163			else if (add_pkg && pkgarg != NULL) {
1164				fprintf(stderr, args_add_message);
1165				exit(EXIT_FAILURE);
1166			}
1167			else if (add_pkg) {
1168				pkgarg = argv[optind-1];
1169			}
1170			break;
1171		default:
1172			break;
1173		}
1174	}
1175
1176	if ((bootstrap_only && force) || access(pkgpath, X_OK) == -1) {
1177		/*
1178		 * To allow 'pkg -N' to be used as a reliable test for whether
1179		 * a system is configured to use pkg, don't bootstrap pkg
1180		 * when that that option is passed.
1181		 */
1182		if (activation_test)
1183			errx(EXIT_FAILURE, "pkg is not installed");
1184
1185		config_init(repo_name);
1186
1187		if (add_pkg) {
1188			if (pkgarg == NULL) {
1189				fprintf(stderr, "Path to pkg.txz required\n");
1190				exit(EXIT_FAILURE);
1191			}
1192			if (access(pkgarg, R_OK) == -1) {
1193				fprintf(stderr, "No such file: %s\n", pkgarg);
1194				exit(EXIT_FAILURE);
1195			}
1196			if (bootstrap_pkg_local(pkgarg, force) != 0)
1197				exit(EXIT_FAILURE);
1198			exit(EXIT_SUCCESS);
1199		}
1200		/*
1201		 * Do not ask for confirmation if either of stdin or stdout is
1202		 * not tty. Check the environment to see if user has answer
1203		 * tucked in there already.
1204		 */
1205		if (!yes)
1206			config_bool(ASSUME_ALWAYS_YES, &yes);
1207		if (!yes) {
1208			if (!isatty(fileno(stdin))) {
1209				fprintf(stderr, non_interactive_message);
1210				exit(EXIT_FAILURE);
1211			}
1212
1213			printf("%s", confirmation_message);
1214			if (pkg_query_yes_no() == 0)
1215				exit(EXIT_FAILURE);
1216		}
1217		if (bootstrap_pkg(force, fetchOpts) != 0)
1218			exit(EXIT_FAILURE);
1219		config_finish();
1220
1221		if (bootstrap_only)
1222			exit(EXIT_SUCCESS);
1223	} else if (bootstrap_only) {
1224		printf("pkg already bootstrapped at %s\n", pkgpath);
1225		exit(EXIT_SUCCESS);
1226	}
1227
1228	execv(pkgpath, argv);
1229
1230	/* NOT REACHED */
1231	return (EXIT_FAILURE);
1232}
1233