1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
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/param.h>
31#include <sys/queue.h>
32#include <sys/types.h>
33#include <sys/wait.h>
34
35#include <archive.h>
36#include <archive_entry.h>
37#include <dirent.h>
38#include <err.h>
39#include <errno.h>
40#include <fcntl.h>
41#include <fetch.h>
42#include <getopt.h>
43#include <libutil.h>
44#include <paths.h>
45#include <stdbool.h>
46#include <stdlib.h>
47#include <stdio.h>
48#include <string.h>
49#include <ucl.h>
50
51#include <openssl/err.h>
52#include <openssl/ssl.h>
53
54#include "dns_utils.h"
55#include "config.h"
56#include "hash.h"
57
58struct sig_cert {
59	char *name;
60	unsigned char *sig;
61	int siglen;
62	unsigned char *cert;
63	int certlen;
64	bool trusted;
65};
66
67struct pubkey {
68	unsigned char *sig;
69	int siglen;
70};
71
72typedef enum {
73	HASH_UNKNOWN,
74	HASH_SHA256,
75} hash_t;
76
77struct fingerprint {
78	hash_t type;
79	char *name;
80	char hash[BUFSIZ];
81	STAILQ_ENTRY(fingerprint) next;
82};
83
84static const char *bootstrap_names []  = {
85	"pkg.pkg",
86	"pkg.txz",
87	NULL
88};
89
90STAILQ_HEAD(fingerprint_list, fingerprint);
91
92static int debug;
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				current = current->next;
241				if (current == NULL)
242					current = mirrors;
243			}
244		}
245	}
246
247	while ((r = fread(buf, 1, sizeof(buf), remote)) > 0) {
248		if (write(fd, buf, r) != r) {
249			warn("write()");
250			goto fetchfail;
251		}
252	}
253
254	if (r != 0) {
255		warn("An error occurred while fetching pkg(8)");
256		goto fetchfail;
257	}
258
259	if (ferror(remote))
260		goto fetchfail;
261
262	goto cleanup;
263
264fetchfail:
265	if (fd != -1) {
266		close(fd);
267		fd = -1;
268		unlink(path);
269	}
270
271cleanup:
272	if (remote != NULL)
273		fclose(remote);
274
275	return fd;
276}
277
278static struct fingerprint *
279parse_fingerprint(ucl_object_t *obj)
280{
281	const ucl_object_t *cur;
282	ucl_object_iter_t it = NULL;
283	const char *function, *fp, *key;
284	struct fingerprint *f;
285	hash_t fct = HASH_UNKNOWN;
286
287	function = fp = NULL;
288
289	while ((cur = ucl_iterate_object(obj, &it, true))) {
290		key = ucl_object_key(cur);
291		if (cur->type != UCL_STRING)
292			continue;
293		if (strcasecmp(key, "function") == 0) {
294			function = ucl_object_tostring(cur);
295			continue;
296		}
297		if (strcasecmp(key, "fingerprint") == 0) {
298			fp = ucl_object_tostring(cur);
299			continue;
300		}
301	}
302
303	if (fp == NULL || function == NULL)
304		return (NULL);
305
306	if (strcasecmp(function, "sha256") == 0)
307		fct = HASH_SHA256;
308
309	if (fct == HASH_UNKNOWN) {
310		warnx("Unsupported hashing function: %s", function);
311		return (NULL);
312	}
313
314	f = calloc(1, sizeof(struct fingerprint));
315	f->type = fct;
316	strlcpy(f->hash, fp, sizeof(f->hash));
317
318	return (f);
319}
320
321static void
322free_fingerprint_list(struct fingerprint_list* list)
323{
324	struct fingerprint *fingerprint, *tmp;
325
326	STAILQ_FOREACH_SAFE(fingerprint, list, next, tmp) {
327		free(fingerprint->name);
328		free(fingerprint);
329	}
330	free(list);
331}
332
333static struct fingerprint *
334load_fingerprint(const char *dir, const char *filename)
335{
336	ucl_object_t *obj = NULL;
337	struct ucl_parser *p = NULL;
338	struct fingerprint *f;
339	char path[MAXPATHLEN];
340
341	f = NULL;
342
343	snprintf(path, MAXPATHLEN, "%s/%s", dir, filename);
344
345	p = ucl_parser_new(0);
346	if (!ucl_parser_add_file(p, path)) {
347		warnx("%s: %s", path, ucl_parser_get_error(p));
348		ucl_parser_free(p);
349		return (NULL);
350	}
351
352	obj = ucl_parser_get_object(p);
353
354	if (obj->type == UCL_OBJECT)
355		f = parse_fingerprint(obj);
356
357	if (f != NULL)
358		f->name = strdup(filename);
359
360	ucl_object_unref(obj);
361	ucl_parser_free(p);
362
363	return (f);
364}
365
366static struct fingerprint_list *
367load_fingerprints(const char *path, int *count)
368{
369	DIR *d;
370	struct dirent *ent;
371	struct fingerprint *finger;
372	struct fingerprint_list *fingerprints;
373
374	*count = 0;
375
376	fingerprints = calloc(1, sizeof(struct fingerprint_list));
377	if (fingerprints == NULL)
378		return (NULL);
379	STAILQ_INIT(fingerprints);
380
381	if ((d = opendir(path)) == NULL) {
382		free(fingerprints);
383
384		return (NULL);
385	}
386
387	while ((ent = readdir(d))) {
388		if (strcmp(ent->d_name, ".") == 0 ||
389		    strcmp(ent->d_name, "..") == 0)
390			continue;
391		finger = load_fingerprint(path, ent->d_name);
392		if (finger != NULL) {
393			STAILQ_INSERT_TAIL(fingerprints, finger, next);
394			++(*count);
395		}
396	}
397
398	closedir(d);
399
400	return (fingerprints);
401}
402
403static EVP_PKEY *
404load_public_key_file(const char *file)
405{
406	EVP_PKEY *pkey;
407	BIO *bp;
408	char errbuf[1024];
409
410	bp = BIO_new_file(file, "r");
411	if (!bp)
412		errx(EXIT_FAILURE, "Unable to read %s", file);
413
414	if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
415		warnx("ici: %s", ERR_error_string(ERR_get_error(), errbuf));
416
417	BIO_free(bp);
418
419	return (pkey);
420}
421
422static EVP_PKEY *
423load_public_key_buf(const unsigned char *cert, int certlen)
424{
425	EVP_PKEY *pkey;
426	BIO *bp;
427	char errbuf[1024];
428
429	bp = BIO_new_mem_buf(__DECONST(void *, cert), certlen);
430
431	if ((pkey = PEM_read_bio_PUBKEY(bp, NULL, NULL, NULL)) == NULL)
432		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
433
434	BIO_free(bp);
435
436	return (pkey);
437}
438
439static bool
440rsa_verify_cert(int fd, const char *sigfile, const unsigned char *key,
441    int keylen, unsigned char *sig, int siglen)
442{
443	EVP_MD_CTX *mdctx;
444	EVP_PKEY *pkey;
445	char *sha256;
446	char errbuf[1024];
447	bool ret;
448
449	sha256 = NULL;
450	pkey = NULL;
451	mdctx = NULL;
452	ret = false;
453
454	SSL_load_error_strings();
455
456	/* Compute SHA256 of the package. */
457	if (lseek(fd, 0, 0) == -1) {
458		warn("lseek");
459		goto cleanup;
460	}
461	if ((sha256 = sha256_fd(fd)) == NULL) {
462		warnx("Error creating SHA256 hash for package");
463		goto cleanup;
464	}
465
466	if (sigfile != NULL) {
467		if ((pkey = load_public_key_file(sigfile)) == NULL) {
468			warnx("Error reading public key");
469			goto cleanup;
470		}
471	} else {
472		if ((pkey = load_public_key_buf(key, keylen)) == NULL) {
473			warnx("Error reading public key");
474			goto cleanup;
475		}
476	}
477
478	/* Verify signature of the SHA256(pkg) is valid. */
479	if ((mdctx = EVP_MD_CTX_create()) == NULL) {
480		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
481		goto error;
482	}
483
484	if (EVP_DigestVerifyInit(mdctx, NULL, EVP_sha256(), NULL, pkey) != 1) {
485		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
486		goto error;
487	}
488	if (EVP_DigestVerifyUpdate(mdctx, sha256, strlen(sha256)) != 1) {
489		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
490		goto error;
491	}
492
493	if (EVP_DigestVerifyFinal(mdctx, sig, siglen) != 1) {
494		warnx("%s", ERR_error_string(ERR_get_error(), errbuf));
495		goto error;
496	}
497
498	ret = true;
499	printf("done\n");
500	goto cleanup;
501
502error:
503	printf("failed\n");
504
505cleanup:
506	free(sha256);
507	if (pkey)
508		EVP_PKEY_free(pkey);
509	if (mdctx)
510		EVP_MD_CTX_destroy(mdctx);
511	ERR_free_strings();
512
513	return (ret);
514}
515
516static struct pubkey *
517read_pubkey(int fd)
518{
519	struct pubkey *pk;
520	char *sigb;
521	size_t sigsz;
522	FILE *sig;
523	char buf[4096];
524	int r;
525
526	if (lseek(fd, 0, 0) == -1) {
527		warn("lseek");
528		return (NULL);
529	}
530
531	sigsz = 0;
532	sigb = NULL;
533	sig = open_memstream(&sigb, &sigsz);
534	if (sig == NULL)
535		err(EXIT_FAILURE, "open_memstream()");
536
537	while ((r = read(fd, buf, sizeof(buf))) >0) {
538		fwrite(buf, 1, r, sig);
539	}
540
541	fclose(sig);
542	pk = calloc(1, sizeof(struct pubkey));
543	pk->siglen = sigsz;
544	pk->sig = calloc(1, pk->siglen);
545	memcpy(pk->sig, sigb, pk->siglen);
546	free(sigb);
547
548	return (pk);
549}
550
551static struct sig_cert *
552parse_cert(int fd) {
553	int my_fd;
554	struct sig_cert *sc;
555	FILE *fp, *sigfp, *certfp, *tmpfp;
556	char *line;
557	char *sig, *cert;
558	size_t linecap, sigsz, certsz;
559	ssize_t linelen;
560
561	sc = NULL;
562	line = NULL;
563	linecap = 0;
564	sig = cert = NULL;
565	sigfp = certfp = tmpfp = NULL;
566
567	if (lseek(fd, 0, 0) == -1) {
568		warn("lseek");
569		return (NULL);
570	}
571
572	/* Duplicate the fd so that fclose(3) does not close it. */
573	if ((my_fd = dup(fd)) == -1) {
574		warnx("dup");
575		return (NULL);
576	}
577
578	if ((fp = fdopen(my_fd, "rb")) == NULL) {
579		warn("fdopen");
580		close(my_fd);
581		return (NULL);
582	}
583
584	sigsz = certsz = 0;
585	sigfp = open_memstream(&sig, &sigsz);
586	if (sigfp == NULL)
587		err(EXIT_FAILURE, "open_memstream()");
588	certfp = open_memstream(&cert, &certsz);
589	if (certfp == NULL)
590		err(EXIT_FAILURE, "open_memstream()");
591
592	while ((linelen = getline(&line, &linecap, fp)) > 0) {
593		if (strcmp(line, "SIGNATURE\n") == 0) {
594			tmpfp = sigfp;
595			continue;
596		} else if (strcmp(line, "CERT\n") == 0) {
597			tmpfp = certfp;
598			continue;
599		} else if (strcmp(line, "END\n") == 0) {
600			break;
601		}
602		if (tmpfp != NULL)
603			fwrite(line, 1, linelen, tmpfp);
604	}
605
606	fclose(fp);
607	fclose(sigfp);
608	fclose(certfp);
609
610	sc = calloc(1, sizeof(struct sig_cert));
611	sc->siglen = sigsz -1; /* Trim out unrelated trailing newline */
612	sc->sig = sig;
613
614	sc->certlen = certsz;
615	sc->cert = cert;
616
617	return (sc);
618}
619
620static bool
621verify_pubsignature(int fd_pkg, int fd_sig)
622{
623	struct pubkey *pk;
624	const char *pubkey;
625	bool ret;
626
627	pk = NULL;
628	pubkey = NULL;
629	ret = false;
630	if (config_string(PUBKEY, &pubkey) != 0) {
631		warnx("No CONFIG_PUBKEY defined");
632		goto cleanup;
633	}
634
635	if ((pk = read_pubkey(fd_sig)) == NULL) {
636		warnx("Error reading signature");
637		goto cleanup;
638	}
639
640	/* Verify the signature. */
641	printf("Verifying signature with public key %s... ", pubkey);
642	if (rsa_verify_cert(fd_pkg, pubkey, NULL, 0, pk->sig,
643	    pk->siglen) == false) {
644		fprintf(stderr, "Signature is not valid\n");
645		goto cleanup;
646	}
647
648	ret = true;
649
650cleanup:
651	if (pk) {
652		free(pk->sig);
653		free(pk);
654	}
655
656	return (ret);
657}
658
659static bool
660verify_signature(int fd_pkg, int fd_sig)
661{
662	struct fingerprint_list *trusted, *revoked;
663	struct fingerprint *fingerprint;
664	struct sig_cert *sc;
665	bool ret;
666	int trusted_count, revoked_count;
667	const char *fingerprints;
668	char path[MAXPATHLEN];
669	char *hash;
670
671	hash = NULL;
672	sc = NULL;
673	trusted = revoked = NULL;
674	ret = false;
675
676	/* Read and parse fingerprints. */
677	if (config_string(FINGERPRINTS, &fingerprints) != 0) {
678		warnx("No CONFIG_FINGERPRINTS defined");
679		goto cleanup;
680	}
681
682	snprintf(path, MAXPATHLEN, "%s/trusted", fingerprints);
683	if ((trusted = load_fingerprints(path, &trusted_count)) == NULL) {
684		warnx("Error loading trusted certificates");
685		goto cleanup;
686	}
687
688	if (trusted_count == 0 || trusted == NULL) {
689		fprintf(stderr, "No trusted certificates found.\n");
690		goto cleanup;
691	}
692
693	snprintf(path, MAXPATHLEN, "%s/revoked", fingerprints);
694	if ((revoked = load_fingerprints(path, &revoked_count)) == NULL) {
695		warnx("Error loading revoked certificates");
696		goto cleanup;
697	}
698
699	/* Read certificate and signature in. */
700	if ((sc = parse_cert(fd_sig)) == NULL) {
701		warnx("Error parsing certificate");
702		goto cleanup;
703	}
704	/* Explicitly mark as non-trusted until proven otherwise. */
705	sc->trusted = false;
706
707	/* Parse signature and pubkey out of the certificate */
708	hash = sha256_buf(sc->cert, sc->certlen);
709
710	/* Check if this hash is revoked */
711	if (revoked != NULL) {
712		STAILQ_FOREACH(fingerprint, revoked, next) {
713			if (strcasecmp(fingerprint->hash, hash) == 0) {
714				fprintf(stderr, "The package was signed with "
715				    "revoked certificate %s\n",
716				    fingerprint->name);
717				goto cleanup;
718			}
719		}
720	}
721
722	STAILQ_FOREACH(fingerprint, trusted, next) {
723		if (strcasecmp(fingerprint->hash, hash) == 0) {
724			sc->trusted = true;
725			sc->name = strdup(fingerprint->name);
726			break;
727		}
728	}
729
730	if (sc->trusted == false) {
731		fprintf(stderr, "No trusted fingerprint found matching "
732		    "package's certificate\n");
733		goto cleanup;
734	}
735
736	/* Verify the signature. */
737	printf("Verifying signature with trusted certificate %s... ", sc->name);
738	if (rsa_verify_cert(fd_pkg, NULL, sc->cert, sc->certlen, sc->sig,
739	    sc->siglen) == false) {
740		fprintf(stderr, "Signature is not valid\n");
741		goto cleanup;
742	}
743
744	ret = true;
745
746cleanup:
747	free(hash);
748	if (trusted)
749		free_fingerprint_list(trusted);
750	if (revoked)
751		free_fingerprint_list(revoked);
752	if (sc) {
753		free(sc->cert);
754		free(sc->sig);
755		free(sc->name);
756		free(sc);
757	}
758
759	return (ret);
760}
761
762static int
763bootstrap_pkg(bool force, const char *fetchOpts)
764{
765	int fd_pkg, fd_sig;
766	int ret;
767	char url[MAXPATHLEN];
768	char tmppkg[MAXPATHLEN];
769	char tmpsig[MAXPATHLEN];
770	const char *packagesite;
771	const char *signature_type;
772	char pkgstatic[MAXPATHLEN];
773	const char *bootstrap_name;
774
775	fd_sig = -1;
776	ret = -1;
777
778	if (config_string(PACKAGESITE, &packagesite) != 0) {
779		warnx("No PACKAGESITE defined");
780		return (-1);
781	}
782
783	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
784		warnx("Error looking up SIGNATURE_TYPE");
785		return (-1);
786	}
787
788	printf("Bootstrapping pkg from %s, please wait...\n", packagesite);
789
790	/* Support pkg+http:// for PACKAGESITE which is the new format
791	   in 1.2 to avoid confusion on why http://pkg.FreeBSD.org has
792	   no A record. */
793	if (strncmp(URL_SCHEME_PREFIX, packagesite,
794	    strlen(URL_SCHEME_PREFIX)) == 0)
795		packagesite += strlen(URL_SCHEME_PREFIX);
796	for (int j = 0; bootstrap_names[j] != NULL; j++) {
797		bootstrap_name = bootstrap_names[j];
798
799		snprintf(url, MAXPATHLEN, "%s/Latest/%s", packagesite, bootstrap_name);
800		snprintf(tmppkg, MAXPATHLEN, "%s/%s.XXXXXX",
801		    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP,
802		    bootstrap_name);
803		if ((fd_pkg = fetch_to_fd(url, tmppkg, fetchOpts)) != -1)
804			break;
805		bootstrap_name = NULL;
806	}
807	if (bootstrap_name == NULL)
808		goto fetchfail;
809
810	if (signature_type != NULL &&
811	    strcasecmp(signature_type, "NONE") != 0) {
812		if (strcasecmp(signature_type, "FINGERPRINTS") == 0) {
813
814			snprintf(tmpsig, MAXPATHLEN, "%s/%s.sig.XXXXXX",
815			    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP,
816			    bootstrap_name);
817			snprintf(url, MAXPATHLEN, "%s/Latest/%s.sig",
818			    packagesite, bootstrap_name);
819
820			if ((fd_sig = fetch_to_fd(url, tmpsig, fetchOpts)) == -1) {
821				fprintf(stderr, "Signature for pkg not "
822				    "available.\n");
823				goto fetchfail;
824			}
825
826			if (verify_signature(fd_pkg, fd_sig) == false)
827				goto cleanup;
828		} else if (strcasecmp(signature_type, "PUBKEY") == 0) {
829
830			snprintf(tmpsig, MAXPATHLEN,
831			    "%s/%s.pubkeysig.XXXXXX",
832			    getenv("TMPDIR") ? getenv("TMPDIR") : _PATH_TMP,
833			    bootstrap_name);
834			snprintf(url, MAXPATHLEN, "%s/Latest/%s.pubkeysig",
835			    packagesite, bootstrap_name);
836
837			if ((fd_sig = fetch_to_fd(url, tmpsig, fetchOpts)) == -1) {
838				fprintf(stderr, "Signature for pkg not "
839				    "available.\n");
840				goto fetchfail;
841			}
842
843			if (verify_pubsignature(fd_pkg, fd_sig) == false)
844				goto cleanup;
845		} else {
846			warnx("Signature type %s is not supported for "
847			    "bootstrapping.", signature_type);
848			goto cleanup;
849		}
850	}
851
852	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
853		ret = install_pkg_static(pkgstatic, tmppkg, force);
854
855	goto cleanup;
856
857fetchfail:
858	warnx("Error fetching %s: %s", url, fetchLastErrString);
859	if (fetchLastErrCode == FETCH_RESOLV) {
860		fprintf(stderr, "Address resolution failed for %s.\n", packagesite);
861		fprintf(stderr, "Consider changing PACKAGESITE.\n");
862	} else {
863		fprintf(stderr, "A pre-built version of pkg could not be found for "
864		    "your system.\n");
865		fprintf(stderr, "Consider changing PACKAGESITE or installing it from "
866		    "ports: 'ports-mgmt/pkg'.\n");
867	}
868
869cleanup:
870	if (fd_sig != -1) {
871		close(fd_sig);
872		unlink(tmpsig);
873	}
874
875	if (fd_pkg != -1) {
876		close(fd_pkg);
877		unlink(tmppkg);
878	}
879
880	return (ret);
881}
882
883static const char confirmation_message[] =
884"The package management tool is not yet installed on your system.\n"
885"Do you want to fetch and install it now? [y/N]: ";
886
887static const char non_interactive_message[] =
888"The package management tool is not yet installed on your system.\n"
889"Please set ASSUME_ALWAYS_YES=yes environment variable to be able to bootstrap "
890"in non-interactive (stdin not being a tty)\n";
891
892static const char args_bootstrap_message[] =
893"Too many arguments\n"
894"Usage: pkg [-4|-6] bootstrap [-f] [-y]\n";
895
896static const char args_add_message[] =
897"Too many arguments\n"
898"Usage: pkg add [-f] [-y] {pkg.txz}\n";
899
900static int
901pkg_query_yes_no(void)
902{
903	int ret, c;
904
905	fflush(stdout);
906	c = getchar();
907
908	if (c == 'y' || c == 'Y')
909		ret = 1;
910	else
911		ret = 0;
912
913	while (c != '\n' && c != EOF)
914		c = getchar();
915
916	return (ret);
917}
918
919static int
920bootstrap_pkg_local(const char *pkgpath, bool force)
921{
922	char path[MAXPATHLEN];
923	char pkgstatic[MAXPATHLEN];
924	const char *signature_type;
925	int fd_pkg, fd_sig, ret;
926
927	fd_sig = -1;
928	ret = -1;
929
930	fd_pkg = open(pkgpath, O_RDONLY);
931	if (fd_pkg == -1)
932		err(EXIT_FAILURE, "Unable to open %s", pkgpath);
933
934	if (config_string(SIGNATURE_TYPE, &signature_type) != 0) {
935		warnx("Error looking up SIGNATURE_TYPE");
936		goto cleanup;
937	}
938	if (signature_type != NULL &&
939	    strcasecmp(signature_type, "NONE") != 0) {
940		if (strcasecmp(signature_type, "FINGERPRINTS") == 0) {
941
942			snprintf(path, sizeof(path), "%s.sig", pkgpath);
943
944			if ((fd_sig = open(path, O_RDONLY)) == -1) {
945				fprintf(stderr, "Signature for pkg not "
946				    "available.\n");
947				goto cleanup;
948			}
949
950			if (verify_signature(fd_pkg, fd_sig) == false)
951				goto cleanup;
952
953		} else if (strcasecmp(signature_type, "PUBKEY") == 0) {
954
955			snprintf(path, sizeof(path), "%s.pubkeysig", pkgpath);
956
957			if ((fd_sig = open(path, O_RDONLY)) == -1) {
958				fprintf(stderr, "Signature for pkg not "
959				    "available.\n");
960				goto cleanup;
961			}
962
963			if (verify_pubsignature(fd_pkg, fd_sig) == false)
964				goto cleanup;
965
966		} else {
967			warnx("Signature type %s is not supported for "
968			    "bootstrapping.", signature_type);
969			goto cleanup;
970		}
971	}
972
973	if ((ret = extract_pkg_static(fd_pkg, pkgstatic, MAXPATHLEN)) == 0)
974		ret = install_pkg_static(pkgstatic, pkgpath, force);
975
976cleanup:
977	close(fd_pkg);
978	if (fd_sig != -1)
979		close(fd_sig);
980
981	return (ret);
982}
983
984#define	PKG_NAME	"pkg"
985#define	PKG_DEVEL_NAME	PKG_NAME "-devel"
986#define	PKG_PKG		PKG_NAME "."
987
988static bool
989pkg_is_pkg_pkg(const char *pkg)
990{
991	char *vstart, *basename;
992	size_t namelen;
993
994	/* Strip path. */
995	if ((basename = strrchr(pkg, '/')) != NULL)
996		pkg = basename + 1;
997
998	/*
999	 * Chop off the final "-" (version delimiter) and check the name that
1000	 * precedes it.  If we didn't have a version delimiter, it must be the
1001	 * pkg.$archive short form but we'll check it anyways.  pkg-devel short
1002	 * form will look like a pkg archive with 'devel' version, but that's
1003	 * OK.  We otherwise assumed that non-pkg packages will always have a
1004	 * version component.
1005	 */
1006	vstart = strrchr(pkg, '-');
1007	if (vstart == NULL) {
1008		return (strlen(pkg) > sizeof(PKG_PKG) - 1 &&
1009		    strncmp(pkg, PKG_PKG, sizeof(PKG_PKG) - 1) == 0);
1010	}
1011
1012	namelen = vstart - pkg;
1013	if (namelen == sizeof(PKG_NAME) - 1 &&
1014	    strncmp(pkg, PKG_NAME, sizeof(PKG_NAME) - 1) == 0)
1015		return (true);
1016	if (namelen == sizeof(PKG_DEVEL_NAME) - 1 &&
1017	    strncmp(pkg, PKG_DEVEL_NAME, sizeof(PKG_DEVEL_NAME) - 1) == 0)
1018		return (true);
1019	return (false);
1020}
1021
1022int
1023main(int argc, char *argv[])
1024{
1025	char pkgpath[MAXPATHLEN];
1026	const char *pkgarg, *repo_name;
1027	bool activation_test, add_pkg, bootstrap_only, force, yes;
1028	signed char ch;
1029	const char *fetchOpts;
1030	char *command;
1031
1032	activation_test = false;
1033	add_pkg = false;
1034	bootstrap_only = false;
1035	command = NULL;
1036	fetchOpts = "";
1037	force = false;
1038	pkgarg = NULL;
1039	repo_name = NULL;
1040	yes = false;
1041
1042	struct option longopts[] = {
1043		{ "debug",		no_argument,		NULL,	'd' },
1044		{ "force",		no_argument,		NULL,	'f' },
1045		{ "only-ipv4",		no_argument,		NULL,	'4' },
1046		{ "only-ipv6",		no_argument,		NULL,	'6' },
1047		{ "yes",		no_argument,		NULL,	'y' },
1048		{ NULL,			0,			NULL,	0   },
1049	};
1050
1051	snprintf(pkgpath, MAXPATHLEN, "%s/sbin/pkg", getlocalbase());
1052
1053	while ((ch = getopt_long(argc, argv, "-:dfr::yN46", longopts, NULL)) != -1) {
1054		switch (ch) {
1055		case 'd':
1056			debug++;
1057			break;
1058		case 'f':
1059			force = true;
1060			break;
1061		case 'N':
1062			activation_test = true;
1063			break;
1064		case 'y':
1065			yes = true;
1066			break;
1067		case '4':
1068			fetchOpts = "4";
1069			break;
1070		case '6':
1071			fetchOpts = "6";
1072			break;
1073		case 'r':
1074			/*
1075			 * The repository can only be specified for an explicit
1076			 * bootstrap request at this time, so that we don't
1077			 * confuse the user if they're trying to use a verb that
1078			 * has some other conflicting meaning but we need to
1079			 * bootstrap.
1080			 *
1081			 * For that reason, we specify that -r has an optional
1082			 * argument above and process the next index ourselves.
1083			 * This is mostly significant because getopt(3) will
1084			 * otherwise eat the next argument, which could be
1085			 * something we need to try and make sense of.
1086			 *
1087			 * At worst this gets us false positives that we ignore
1088			 * in other contexts, and we have to do a little fudging
1089			 * in order to support separating -r from the reponame
1090			 * with a space since it's not actually optional in
1091			 * the bootstrap/add sense.
1092			 */
1093			if (add_pkg || bootstrap_only) {
1094				if (optarg != NULL) {
1095					repo_name = optarg;
1096				} else if (optind < argc) {
1097					repo_name = argv[optind];
1098				}
1099
1100				if (repo_name == NULL || *repo_name == '\0') {
1101					fprintf(stderr,
1102					    "Must specify a repository with -r!\n");
1103					exit(EXIT_FAILURE);
1104				}
1105
1106				if (optarg == NULL) {
1107					/* Advance past repo name. */
1108					optreset = 1;
1109					optind++;
1110				}
1111			}
1112			break;
1113		case 1:
1114			// Non-option arguments, first one is the command
1115			if (command == NULL) {
1116				command = argv[optind-1];
1117				if (strcmp(command, "add") == 0) {
1118					add_pkg = true;
1119				}
1120				else if (strcmp(command, "bootstrap") == 0) {
1121					bootstrap_only = true;
1122				}
1123			}
1124			// bootstrap doesn't accept other arguments
1125			else if (bootstrap_only) {
1126				fprintf(stderr, args_bootstrap_message);
1127				exit(EXIT_FAILURE);
1128			}
1129			else if (add_pkg && pkgarg != NULL) {
1130				/*
1131				 * Additional arguments also means it's not a
1132				 * local bootstrap request.
1133				 */
1134				add_pkg = false;
1135			}
1136			else if (add_pkg) {
1137				/*
1138				 * If it's not a request for pkg or pkg-devel,
1139				 * then we must assume they were trying to
1140				 * install some other local package and we
1141				 * should try to bootstrap from the repo.
1142				 */
1143				if (!pkg_is_pkg_pkg(argv[optind-1])) {
1144					add_pkg = false;
1145				} else {
1146					pkgarg = argv[optind-1];
1147				}
1148			}
1149			break;
1150		default:
1151			break;
1152		}
1153	}
1154	if (debug > 1)
1155		fetchDebug = 1;
1156
1157	if ((bootstrap_only && force) || access(pkgpath, X_OK) == -1) {
1158		/*
1159		 * To allow 'pkg -N' to be used as a reliable test for whether
1160		 * a system is configured to use pkg, don't bootstrap pkg
1161		 * when that option is passed.
1162		 */
1163		if (activation_test)
1164			errx(EXIT_FAILURE, "pkg is not installed");
1165
1166		config_init(repo_name);
1167
1168		if (add_pkg) {
1169			if (pkgarg == NULL) {
1170				fprintf(stderr, "Path to pkg.txz required\n");
1171				exit(EXIT_FAILURE);
1172			}
1173			if (access(pkgarg, R_OK) == -1) {
1174				fprintf(stderr, "No such file: %s\n", pkgarg);
1175				exit(EXIT_FAILURE);
1176			}
1177			if (bootstrap_pkg_local(pkgarg, force) != 0)
1178				exit(EXIT_FAILURE);
1179			exit(EXIT_SUCCESS);
1180		}
1181		/*
1182		 * Do not ask for confirmation if either of stdin or stdout is
1183		 * not tty. Check the environment to see if user has answer
1184		 * tucked in there already.
1185		 */
1186		if (!yes)
1187			config_bool(ASSUME_ALWAYS_YES, &yes);
1188		if (!yes) {
1189			if (!isatty(fileno(stdin))) {
1190				fprintf(stderr, non_interactive_message);
1191				exit(EXIT_FAILURE);
1192			}
1193
1194			printf("%s", confirmation_message);
1195			if (pkg_query_yes_no() == 0)
1196				exit(EXIT_FAILURE);
1197		}
1198		if (bootstrap_pkg(force, fetchOpts) != 0)
1199			exit(EXIT_FAILURE);
1200		config_finish();
1201
1202		if (bootstrap_only)
1203			exit(EXIT_SUCCESS);
1204	} else if (bootstrap_only) {
1205		printf("pkg already bootstrapped at %s\n", pkgpath);
1206		exit(EXIT_SUCCESS);
1207	}
1208
1209	execv(pkgpath, argv);
1210
1211	/* NOT REACHED */
1212	return (EXIT_FAILURE);
1213}
1214