1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1998-2016 Dag-Erling Smørgrav
5 * Copyright (c) 2013 Michael Gmelin <freebsd@grem.de>
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 * in this position and unchanged.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
17 * 3. The name of the author may not be used to endorse or promote products
18 * derived from this software without specific prior written permission
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #include "bsd_compat.h"
34 __FBSDID("$FreeBSD: head/lib/libfetch/common.c 347050 2019-05-03 06:06:39Z adrian $");
35
36 #include <sys/param.h>
37 #include <sys/socket.h>
38 #include <sys/time.h>
39 #include <sys/uio.h>
40
41 #include <netinet/in.h>
42
43 #include <ctype.h>
44 #include <errno.h>
45 #include <fcntl.h>
46 #include <netdb.h>
47 #include <poll.h>
48 #include <pwd.h>
49 #include <stdarg.h>
50 #include <stdlib.h>
51 #include <stdio.h>
52 #include <string.h>
53 #include <unistd.h>
54
55 #ifdef WITH_SSL
56 #include <openssl/x509v3.h>
57 #endif
58
59 #include "fetch.h"
60 #include "common.h"
61
62 #ifndef INFTIM
63 #define INFTIM (-1)
64 #endif
65
66 /*** Local data **************************************************************/
67
68 /*
69 * Error messages for resolver errors
70 */
71 static struct fetcherr netdb_errlist[] = {
72 #ifdef EAI_NODATA
73 { EAI_NODATA, FETCH_RESOLV, "Host not found" },
74 #endif
75 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" },
76 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" },
77 { EAI_NONAME, FETCH_RESOLV, "No address record" },
78 { -1, FETCH_UNKNOWN, "Unknown resolver error" }
79 };
80
81 /* End-of-Line */
82 static const char ENDL[2] = "\r\n";
83
84
85 /*** Error-reporting functions ***********************************************/
86
87 /*
88 * Map error code to string
89 */
90 static struct fetcherr *
fetch_finderr(struct fetcherr * p,int e)91 fetch_finderr(struct fetcherr *p, int e)
92 {
93 while (p->num != -1 && p->num != e)
94 p++;
95 return (p);
96 }
97
98 /*
99 * Set error code
100 */
101 void
fetch_seterr(struct fetcherr * p,int e)102 fetch_seterr(struct fetcherr *p, int e)
103 {
104 p = fetch_finderr(p, e);
105 fetchLastErrCode = p->cat;
106 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string);
107 }
108
109 /*
110 * Set error code according to errno
111 */
112 void
fetch_syserr(void)113 fetch_syserr(void)
114 {
115 switch (errno) {
116 case 0:
117 fetchLastErrCode = FETCH_OK;
118 break;
119 case EPERM:
120 case EACCES:
121 case EROFS:
122 case EAUTH:
123 case ENEEDAUTH:
124 fetchLastErrCode = FETCH_AUTH;
125 break;
126 case ENOENT:
127 case EISDIR: /* XXX */
128 fetchLastErrCode = FETCH_UNAVAIL;
129 break;
130 case ENOMEM:
131 fetchLastErrCode = FETCH_MEMORY;
132 break;
133 case EBUSY:
134 case EAGAIN:
135 fetchLastErrCode = FETCH_TEMP;
136 break;
137 case EEXIST:
138 fetchLastErrCode = FETCH_EXISTS;
139 break;
140 case ENOSPC:
141 fetchLastErrCode = FETCH_FULL;
142 break;
143 case EADDRINUSE:
144 case EADDRNOTAVAIL:
145 case ENETDOWN:
146 case ENETUNREACH:
147 case ENETRESET:
148 case EHOSTUNREACH:
149 fetchLastErrCode = FETCH_NETWORK;
150 break;
151 case ECONNABORTED:
152 case ECONNRESET:
153 fetchLastErrCode = FETCH_ABORT;
154 break;
155 case ETIMEDOUT:
156 fetchLastErrCode = FETCH_TIMEOUT;
157 break;
158 case ECONNREFUSED:
159 case EHOSTDOWN:
160 fetchLastErrCode = FETCH_DOWN;
161 break;
162 default:
163 fetchLastErrCode = FETCH_UNKNOWN;
164 }
165 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno));
166 }
167
168
169 /*
170 * Emit status message
171 */
172 void
fetch_info(const char * fmt,...)173 fetch_info(const char *fmt, ...)
174 {
175 va_list ap;
176
177 va_start(ap, fmt);
178 vfprintf(stderr, fmt, ap);
179 va_end(ap);
180 fputc('\n', stderr);
181 }
182
183
184 /*** Network-related utility functions ***************************************/
185
186 /*
187 * Return the default port for a scheme
188 */
189 int
fetch_default_port(const char * scheme)190 fetch_default_port(const char *scheme)
191 {
192 struct servent *se;
193
194 if ((se = getservbyname(scheme, "tcp")) != NULL)
195 return (ntohs(se->s_port));
196 if (strcmp(scheme, SCHEME_FTP) == 0)
197 return (FTP_DEFAULT_PORT);
198 if (strcmp(scheme, SCHEME_HTTP) == 0)
199 return (HTTP_DEFAULT_PORT);
200 return (0);
201 }
202
203 /*
204 * Return the default proxy port for a scheme
205 */
206 int
fetch_default_proxy_port(const char * scheme)207 fetch_default_proxy_port(const char *scheme)
208 {
209 if (strcmp(scheme, SCHEME_FTP) == 0)
210 return (FTP_DEFAULT_PROXY_PORT);
211 if (strcmp(scheme, SCHEME_HTTP) == 0)
212 return (HTTP_DEFAULT_PROXY_PORT);
213 return (0);
214 }
215
216
217 /*
218 * Create a connection for an existing descriptor.
219 */
220 conn_t *
fetch_reopen(int sd)221 fetch_reopen(int sd)
222 {
223 conn_t *conn;
224 #ifdef SO_NOSIGPIPE
225 int opt = 1;
226 #endif
227
228 /* allocate and fill connection structure */
229 if ((conn = calloc(1, sizeof(*conn))) == NULL)
230 return (NULL);
231 fcntl(sd, F_SETFD, FD_CLOEXEC);
232 #ifdef SO_NOSIGPIPE
233 setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt);
234 #endif
235 conn->sd = sd;
236 ++conn->ref;
237 return (conn);
238 }
239
240
241 /*
242 * Bump a connection's reference count.
243 */
244 conn_t *
fetch_ref(conn_t * conn)245 fetch_ref(conn_t *conn)
246 {
247
248 ++conn->ref;
249 return (conn);
250 }
251
252
253 /*
254 * Resolve an address
255 */
256 struct addrinfo *
fetch_resolve(const char * addr,int port,int af)257 fetch_resolve(const char *addr, int port, int af)
258 {
259 char hbuf[256], sbuf[8];
260 struct addrinfo hints, *res;
261 const char *hb, *he, *sep;
262 const char *host, *service;
263 int err, len;
264
265 /* first, check for a bracketed IPv6 address */
266 if (*addr == '[') {
267 hb = addr + 1;
268 if ((sep = strchr(hb, ']')) == NULL) {
269 errno = EINVAL;
270 goto syserr;
271 }
272 he = sep++;
273 } else {
274 hb = addr;
275 #if HAVE_STRCHRNUL
276 sep = strchrnul(hb, ':');
277 #else
278 sep = hb;
279 do { sep++; } while (*sep && *sep != ':');
280 #endif
281 he = sep;
282 }
283
284 /* see if we need to copy the host name */
285 if (*he != '\0') {
286 len = snprintf(hbuf, sizeof(hbuf),
287 "%.*s", (int)(he - hb), hb);
288 if (len < 0)
289 goto syserr;
290 if (len >= (int)sizeof(hbuf)) {
291 errno = ENAMETOOLONG;
292 goto syserr;
293 }
294 host = hbuf;
295 } else {
296 host = hb;
297 }
298
299 /* was it followed by a service name? */
300 if (*sep == '\0' && port != 0) {
301 if (port < 1 || port > 65535) {
302 errno = EINVAL;
303 goto syserr;
304 }
305 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0)
306 goto syserr;
307 service = sbuf;
308 } else if (*sep != '\0') {
309 service = sep + 1;
310 } else {
311 service = NULL;
312 }
313
314 /* resolve */
315 memset(&hints, 0, sizeof(hints));
316 hints.ai_family = af;
317 hints.ai_socktype = SOCK_STREAM;
318 hints.ai_flags = AI_ADDRCONFIG;
319 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) {
320 netdb_seterr(err);
321 return (NULL);
322 }
323 return (res);
324 syserr:
325 fetch_syserr();
326 return (NULL);
327 }
328
329
330
331 /*
332 * Bind a socket to a specific local address
333 */
334 int
fetch_bind(int sd,int af,const char * addr)335 fetch_bind(int sd, int af, const char *addr)
336 {
337 struct addrinfo *cliai, *ai;
338 int err;
339
340 if ((cliai = fetch_resolve(addr, 0, af)) == NULL)
341 return (-1);
342 for (ai = cliai; ai != NULL; ai = ai->ai_next)
343 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0)
344 break;
345 if (err != 0)
346 fetch_syserr();
347 freeaddrinfo(cliai);
348 return (err == 0 ? 0 : -1);
349 }
350
351
352 /*
353 * Establish a TCP connection to the specified port on the specified host.
354 */
355 conn_t *
fetch_connect(struct url * u,int af,int verbose)356 fetch_connect(struct url *u, int af, int verbose)
357 {
358 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai;
359 const char *bindaddr;
360 conn_t *conn = NULL;
361 int err = 0, sd = -1;
362
363 DEBUGF("---> %s:%d\n", u->host, u->port);
364
365 /* resolve server address */
366 if (verbose)
367 fetch_info("resolving server address: %s:%d", u->host, u->port);
368 if ((sais = fetch_resolve(u->host, u->port, af)) == NULL)
369 goto fail;
370
371 /* resolve client address */
372 bindaddr = getenv("FETCH_BIND_ADDRESS");
373 if (bindaddr != NULL && *bindaddr != '\0') {
374 if (verbose)
375 fetch_info("resolving client address: %s", bindaddr);
376 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL)
377 goto fail;
378 }
379
380 /* try each server address in turn */
381 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) {
382 /* open socket */
383 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0)
384 goto syserr;
385 /* attempt to bind to client address */
386 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) {
387 if (cai->ai_family != sai->ai_family)
388 continue;
389 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0)
390 break;
391 }
392 if (err != 0) {
393 if (verbose)
394 fetch_info("failed to bind to %s", bindaddr);
395 goto syserr;
396 }
397 /* attempt to connect to server address */
398 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0)
399 break;
400 /* clean up before next attempt */
401 close(sd);
402 sd = -1;
403 }
404 if (err != 0) {
405 if (verbose)
406 fetch_info("failed to connect to %s:%d", u->host, u->port);
407 goto syserr;
408 }
409
410 if ((conn = fetch_reopen(sd)) == NULL)
411 goto syserr;
412
413 strlcpy(conn->scheme, u->scheme, sizeof(conn->scheme));
414 strlcpy(conn->host, u->host, sizeof(conn->host));
415 strlcpy(conn->user, u->user, sizeof(conn->user));
416 strlcpy(conn->pwd, u->pwd, sizeof(conn->pwd));
417 conn->port = u->port;
418 conn->af = af;
419
420 if (cais != NULL)
421 freeaddrinfo(cais);
422 if (sais != NULL)
423 freeaddrinfo(sais);
424 return (conn);
425 syserr:
426 fetch_syserr();
427 goto fail;
428 fail:
429 if (sd >= 0)
430 close(sd);
431 if (cais != NULL)
432 freeaddrinfo(cais);
433 if (sais != NULL)
434 freeaddrinfo(sais);
435 return (NULL);
436 }
437 static conn_t *connection_cache;
438 static int cache_global_limit = 0;
439 static int cache_per_host_limit = 0;
440
441 /*
442 * Initialise cache with the given limits.
443 */
444 void
fetchConnectionCacheInit(int global_limit,int per_host_limit)445 fetchConnectionCacheInit(int global_limit, int per_host_limit)
446 {
447
448 if (global_limit < 0)
449 cache_global_limit = INT_MAX;
450 else if (per_host_limit > global_limit)
451 cache_global_limit = per_host_limit;
452 else
453 cache_global_limit = global_limit;
454 if (per_host_limit < 0)
455 cache_per_host_limit = INT_MAX;
456 else
457 cache_per_host_limit = per_host_limit;
458 }
459
460 /*
461 * Flush cache and free all associated resources.
462 */
463 void
fetchConnectionCacheClose(void)464 fetchConnectionCacheClose(void)
465 {
466 conn_t *conn;
467
468 while ((conn = connection_cache) != NULL) {
469 connection_cache = conn->next;
470 (*conn->close)(conn);
471 }
472 }
473
474 /*
475 * Check connection cache for an existing entry matching
476 * protocol/host/port/user/password/family.
477 */
478 conn_t *
fetch_cache_get(const struct url * url,int af)479 fetch_cache_get(const struct url *url, int af)
480 {
481 conn_t *conn, *last_conn = NULL;
482
483 for (conn = connection_cache; conn; conn = conn->next) {
484 if (conn->port == url->port &&
485 strcmp(conn->scheme, url->scheme) == 0 &&
486 strcmp(conn->host, url->host) == 0 &&
487 strcmp(conn->user, url->user) == 0 &&
488 strcmp(conn->pwd, url->pwd) == 0 &&
489 (conn->af == AF_UNSPEC || af == AF_UNSPEC ||
490 conn->af == af)) {
491 if (last_conn != NULL)
492 last_conn->next = conn->next;
493 else
494 connection_cache = conn->next;
495
496 return conn;
497 }
498 }
499
500 return NULL;
501 }
502
503 /*
504 * Put the connection back into the cache for reuse.
505 */
506 void
fetch_cache_put(conn_t * conn,int (* closecb)(conn_t *))507 fetch_cache_put(conn_t *conn, int (*closecb)(conn_t *))
508 {
509 conn_t *iter, *last;
510 int global_count, host_count;
511
512 global_count = host_count = 0;
513 last = NULL;
514 for (iter = connection_cache; iter;
515 last = iter, iter = iter->next) {
516 ++global_count;
517 if (strcmp(conn->host, iter->host) == 0)
518 ++host_count;
519 if (global_count < cache_global_limit &&
520 host_count < cache_per_host_limit)
521 continue;
522 --global_count;
523 if (last != NULL)
524 last->next = iter->next;
525 else
526 connection_cache = iter->next;
527 (*iter->close)(iter);
528 }
529
530 conn->close = closecb;
531 conn->next = connection_cache;
532 connection_cache = conn;
533 }
534
535 #ifdef WITH_SSL
536 /*
537 * Convert characters A-Z to lowercase (intentionally avoid any locale
538 * specific conversions).
539 */
540 static char
fetch_ssl_tolower(char in)541 fetch_ssl_tolower(char in)
542 {
543 if (in >= 'A' && in <= 'Z')
544 return (in + 32);
545 else
546 return (in);
547 }
548
549 /*
550 * isalpha implementation that intentionally avoids any locale specific
551 * conversions.
552 */
553 static int
fetch_ssl_isalpha(char in)554 fetch_ssl_isalpha(char in)
555 {
556 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z'));
557 }
558
559 /*
560 * Check if passed hostnames a and b are equal.
561 */
562 static int
fetch_ssl_hname_equal(const char * a,size_t alen,const char * b,size_t blen)563 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b,
564 size_t blen)
565 {
566 size_t i;
567
568 if (alen != blen)
569 return (0);
570 for (i = 0; i < alen; ++i) {
571 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i]))
572 return (0);
573 }
574 return (1);
575 }
576
577 /*
578 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9
579 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha-
580 * numeric characters. Double hyphens (like they're found in IDN a-labels
581 * 'xn--') are not allowed. Empty labels are invalid.
582 */
583 static int
fetch_ssl_is_trad_domain_label(const char * l,size_t len,int wcok)584 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok)
585 {
586 size_t i;
587
588 if (!len || l[0] == '-' || l[len-1] == '-')
589 return (0);
590 for (i = 0; i < len; ++i) {
591 if (!isdigit(l[i]) &&
592 !fetch_ssl_isalpha(l[i]) &&
593 !(l[i] == '*' && wcok) &&
594 !(l[i] == '-' && l[i - 1] != '-'))
595 return (0);
596 }
597 return (1);
598 }
599
600 /*
601 * Check if host name consists only of numbers. This might indicate an IP
602 * address, which is not a good idea for CN wildcard comparison.
603 */
604 static int
fetch_ssl_hname_is_only_numbers(const char * hostname,size_t len)605 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len)
606 {
607 size_t i;
608
609 for (i = 0; i < len; ++i) {
610 if (!((hostname[i] >= '0' && hostname[i] <= '9') ||
611 hostname[i] == '.'))
612 return (0);
613 }
614 return (1);
615 }
616
617 /*
618 * Check if the host name h passed matches the pattern passed in m which
619 * is usually part of subjectAltName or CN of a certificate presented to
620 * the client. This includes wildcard matching. The algorithm is based on
621 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280.
622 */
623 static int
fetch_ssl_hname_match(const char * h,size_t hlen,const char * m,size_t mlen)624 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m,
625 size_t mlen)
626 {
627 int delta, hdotidx, mdot1idx, wcidx;
628 const char *hdot, *mdot1, *mdot2;
629 const char *wc; /* wildcard */
630
631 if (!(h && *h && m && *m))
632 return (0);
633 if ((wc = strnstr(m, "*", mlen)) == NULL)
634 return (fetch_ssl_hname_equal(h, hlen, m, mlen));
635 wcidx = wc - m;
636 /* hostname should not be just dots and numbers */
637 if (fetch_ssl_hname_is_only_numbers(h, hlen))
638 return (0);
639 /* only one wildcard allowed in pattern */
640 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL)
641 return (0);
642 /*
643 * there must be at least two more domain labels and
644 * wildcard has to be in the leftmost label (RFC6125)
645 */
646 mdot1 = strnstr(m, ".", mlen);
647 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4)
648 return (0);
649 mdot1idx = mdot1 - m;
650 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1);
651 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2)
652 return (0);
653 /* hostname must contain a dot and not be the 1st char */
654 hdot = strnstr(h, ".", hlen);
655 if (hdot == NULL || hdot == h)
656 return (0);
657 hdotidx = hdot - h;
658 /*
659 * host part of hostname must be at least as long as
660 * pattern it's supposed to match
661 */
662 if (hdotidx < mdot1idx)
663 return (0);
664 /*
665 * don't allow wildcards in non-traditional domain names
666 * (IDN, A-label, U-label...)
667 */
668 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) ||
669 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1))
670 return (0);
671 /* match domain part (part after first dot) */
672 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1,
673 mlen - mdot1idx))
674 return (0);
675 /* match part left of wildcard */
676 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx))
677 return (0);
678 /* match part right of wildcard */
679 delta = mdot1idx - wcidx - 1;
680 if (!fetch_ssl_hname_equal(hdot - delta, delta,
681 mdot1 - delta, delta))
682 return (0);
683 /* all tests succeeded, it's a match */
684 return (1);
685 }
686
687 /*
688 * Get numeric host address info - returns NULL if host was not an IP
689 * address. The caller is responsible for deallocation using
690 * freeaddrinfo(3).
691 */
692 static struct addrinfo *
fetch_ssl_get_numeric_addrinfo(const char * hostname,size_t len)693 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len)
694 {
695 struct addrinfo hints, *res;
696 char *host;
697
698 host = (char *)malloc(len + 1);
699 memcpy(host, hostname, len);
700 host[len] = '\0';
701 memset(&hints, 0, sizeof(hints));
702 hints.ai_family = PF_UNSPEC;
703 hints.ai_socktype = SOCK_STREAM;
704 hints.ai_protocol = 0;
705 hints.ai_flags = AI_NUMERICHOST;
706 /* port is not relevant for this purpose */
707 if (getaddrinfo(host, "443", &hints, &res) != 0)
708 res = NULL;
709 free(host);
710 return res;
711 }
712
713 /*
714 * Compare ip address in addrinfo with address passes.
715 */
716 static int
fetch_ssl_ipaddr_match_bin(const struct addrinfo * lhost,const char * rhost,size_t rhostlen)717 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost,
718 size_t rhostlen)
719 {
720 const void *left;
721
722 if (lhost->ai_family == AF_INET && rhostlen == 4) {
723 left = (void *)&((struct sockaddr_in*)(void *)
724 lhost->ai_addr)->sin_addr.s_addr;
725 #ifdef INET6
726 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) {
727 left = (void *)&((struct sockaddr_in6 *)(void *)
728 lhost->ai_addr)->sin6_addr;
729 #endif
730 } else
731 return (0);
732 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0);
733 }
734
735 /*
736 * Compare ip address in addrinfo with host passed. If host is not an IP
737 * address, comparison will fail.
738 */
739 static int
fetch_ssl_ipaddr_match(const struct addrinfo * laddr,const char * r,size_t rlen)740 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r,
741 size_t rlen)
742 {
743 struct addrinfo *raddr;
744 int ret;
745 char *rip;
746
747 ret = 0;
748 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL)
749 return 0; /* not a numeric host */
750
751 if (laddr->ai_family == raddr->ai_family) {
752 if (laddr->ai_family == AF_INET) {
753 rip = (char *)&((struct sockaddr_in *)(void *)
754 raddr->ai_addr)->sin_addr.s_addr;
755 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4);
756 #ifdef INET6
757 } else if (laddr->ai_family == AF_INET6) {
758 rip = (char *)&((struct sockaddr_in6 *)(void *)
759 raddr->ai_addr)->sin6_addr;
760 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16);
761 #endif
762 }
763
764 }
765 freeaddrinfo(raddr);
766 return (ret);
767 }
768
769 /*
770 * Verify server certificate by subjectAltName.
771 */
772 static int
fetch_ssl_verify_altname(STACK_OF (GENERAL_NAME)* altnames,const char * host,struct addrinfo * ip)773 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames,
774 const char *host, struct addrinfo *ip)
775 {
776 const GENERAL_NAME *name;
777 size_t nslen;
778 int i;
779 const char *ns;
780
781 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) {
782 #if OPENSSL_VERSION_NUMBER < 0x10000000L
783 /*
784 * This is a workaround, since the following line causes
785 * alignment issues in clang:
786 * name = sk_GENERAL_NAME_value(altnames, i);
787 * OpenSSL explicitly warns not to use those macros
788 * directly, but there isn't much choice (and there
789 * shouldn't be any ill side effects)
790 */
791 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i);
792 #else
793 name = sk_GENERAL_NAME_value(altnames, i);
794 #endif
795 #if OPENSSL_VERSION_NUMBER < 0x10100000L
796 ns = (const char *)ASN1_STRING_data(name->d.ia5);
797 #else
798 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5);
799 #endif
800 nslen = (size_t)ASN1_STRING_length(name->d.ia5);
801
802 if (name->type == GEN_DNS && ip == NULL &&
803 fetch_ssl_hname_match(host, strlen(host), ns, nslen))
804 return (1);
805 else if (name->type == GEN_IPADD && ip != NULL &&
806 fetch_ssl_ipaddr_match_bin(ip, ns, nslen))
807 return (1);
808 }
809 return (0);
810 }
811
812 /*
813 * Verify server certificate by CN.
814 */
815 static int
fetch_ssl_verify_cn(X509_NAME * subject,const char * host,struct addrinfo * ip)816 fetch_ssl_verify_cn(X509_NAME *subject, const char *host,
817 struct addrinfo *ip)
818 {
819 ASN1_STRING *namedata;
820 X509_NAME_ENTRY *nameentry;
821 int cnlen, lastpos, loc, ret;
822 unsigned char *cn;
823
824 ret = 0;
825 lastpos = -1;
826 loc = -1;
827 cn = NULL;
828 /* get most specific CN (last entry in list) and compare */
829 while ((lastpos = X509_NAME_get_index_by_NID(subject,
830 NID_commonName, lastpos)) != -1)
831 loc = lastpos;
832
833 if (loc > -1) {
834 nameentry = X509_NAME_get_entry(subject, loc);
835 namedata = X509_NAME_ENTRY_get_data(nameentry);
836 cnlen = ASN1_STRING_to_UTF8(&cn, namedata);
837 if (ip == NULL &&
838 fetch_ssl_hname_match(host, strlen(host), cn, cnlen))
839 ret = 1;
840 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen))
841 ret = 1;
842 OPENSSL_free(cn);
843 }
844 return (ret);
845 }
846
847 /*
848 * Verify that server certificate subjectAltName/CN matches
849 * hostname. First check, if there are alternative subject names. If yes,
850 * those have to match. Only if those don't exist it falls back to
851 * checking the subject's CN.
852 */
853 static int
fetch_ssl_verify_hname(X509 * cert,const char * host)854 fetch_ssl_verify_hname(X509 *cert, const char *host)
855 {
856 struct addrinfo *ip;
857 STACK_OF(GENERAL_NAME) *altnames;
858 X509_NAME *subject;
859 int ret;
860
861 ret = 0;
862 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host));
863 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name,
864 NULL, NULL);
865
866 if (altnames != NULL) {
867 ret = fetch_ssl_verify_altname(altnames, host, ip);
868 } else {
869 subject = X509_get_subject_name(cert);
870 if (subject != NULL)
871 ret = fetch_ssl_verify_cn(subject, host, ip);
872 }
873
874 if (ip != NULL)
875 freeaddrinfo(ip);
876 if (altnames != NULL)
877 GENERAL_NAMES_free(altnames);
878 return (ret);
879 }
880
881 /*
882 * Configure transport security layer based on environment.
883 */
884 static void
fetch_ssl_setup_transport_layer(SSL_CTX * ctx,int verbose)885 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose)
886 {
887 long ssl_ctx_options;
888
889 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET;
890 if (getenv("SSL_ALLOW_SSL3") == NULL)
891 ssl_ctx_options |= SSL_OP_NO_SSLv3;
892 if (getenv("SSL_NO_TLS1") != NULL)
893 ssl_ctx_options |= SSL_OP_NO_TLSv1;
894 if (getenv("SSL_NO_TLS1_1") != NULL)
895 ssl_ctx_options |= SSL_OP_NO_TLSv1_1;
896 if (getenv("SSL_NO_TLS1_2") != NULL)
897 ssl_ctx_options |= SSL_OP_NO_TLSv1_2;
898 if (verbose)
899 fetch_info("SSL options: %lx", ssl_ctx_options);
900 SSL_CTX_set_options(ctx, ssl_ctx_options);
901 }
902
903
904 /*
905 * Configure peer verification based on environment.
906 */
907 #define LOCAL_CERT_FILE "/usr/local/etc/ssl/cert.pem"
908 #define BASE_CERT_FILE "/etc/ssl/cert.pem"
909 static int
fetch_ssl_setup_peer_verification(SSL_CTX * ctx,int verbose)910 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose)
911 {
912 X509_LOOKUP *crl_lookup;
913 X509_STORE *crl_store;
914 const char *ca_cert_file, *ca_cert_path, *crl_file;
915
916 if (getenv("SSL_NO_VERIFY_PEER") == NULL) {
917 ca_cert_file = getenv("SSL_CA_CERT_FILE");
918 if (ca_cert_file == NULL &&
919 access(LOCAL_CERT_FILE, R_OK) == 0)
920 ca_cert_file = LOCAL_CERT_FILE;
921 if (ca_cert_file == NULL &&
922 access(BASE_CERT_FILE, R_OK) == 0)
923 ca_cert_file = BASE_CERT_FILE;
924 ca_cert_path = getenv("SSL_CA_CERT_PATH");
925 if (verbose) {
926 fetch_info("Peer verification enabled");
927 if (ca_cert_file != NULL)
928 fetch_info("Using CA cert file: %s",
929 ca_cert_file);
930 if (ca_cert_path != NULL)
931 fetch_info("Using CA cert path: %s",
932 ca_cert_path);
933 if (ca_cert_file == NULL && ca_cert_path == NULL)
934 fetch_info("Using OpenSSL default "
935 "CA cert file and path");
936 }
937 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER,
938 fetch_ssl_cb_verify_crt);
939 if (ca_cert_file != NULL || ca_cert_path != NULL)
940 SSL_CTX_load_verify_locations(ctx, ca_cert_file,
941 ca_cert_path);
942 else
943 SSL_CTX_set_default_verify_paths(ctx);
944 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) {
945 if (verbose)
946 fetch_info("Using CRL file: %s", crl_file);
947 crl_store = SSL_CTX_get_cert_store(ctx);
948 crl_lookup = X509_STORE_add_lookup(crl_store,
949 X509_LOOKUP_file());
950 if (crl_lookup == NULL ||
951 !X509_load_crl_file(crl_lookup, crl_file,
952 X509_FILETYPE_PEM)) {
953 fprintf(stderr,
954 "Could not load CRL file %s\n",
955 crl_file);
956 return (0);
957 }
958 X509_STORE_set_flags(crl_store,
959 X509_V_FLAG_CRL_CHECK |
960 X509_V_FLAG_CRL_CHECK_ALL);
961 }
962 }
963 return (1);
964 }
965
966 /*
967 * Configure client certificate based on environment.
968 */
969 static int
fetch_ssl_setup_client_certificate(SSL_CTX * ctx,int verbose)970 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose)
971 {
972 const char *client_cert_file, *client_key_file;
973
974 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) {
975 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ?
976 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file;
977 if (verbose) {
978 fetch_info("Using client cert file: %s",
979 client_cert_file);
980 fetch_info("Using client key file: %s",
981 client_key_file);
982 }
983 if (SSL_CTX_use_certificate_chain_file(ctx,
984 client_cert_file) != 1) {
985 fprintf(stderr,
986 "Could not load client certificate %s\n",
987 client_cert_file);
988 return (0);
989 }
990 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file,
991 SSL_FILETYPE_PEM) != 1) {
992 fprintf(stderr,
993 "Could not load client key %s\n",
994 client_key_file);
995 return (0);
996 }
997 }
998 return (1);
999 }
1000
1001 /*
1002 * Callback for SSL certificate verification, this is called on server
1003 * cert verification. It takes no decision, but informs the user in case
1004 * verification failed.
1005 */
1006 int
fetch_ssl_cb_verify_crt(int verified,X509_STORE_CTX * ctx)1007 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx)
1008 {
1009 X509 *crt;
1010 X509_NAME *name;
1011 char *str;
1012
1013 str = NULL;
1014 if (!verified) {
1015 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL &&
1016 (name = X509_get_subject_name(crt)) != NULL)
1017 str = X509_NAME_oneline(name, 0, 0);
1018 fprintf(stderr, "Certificate verification failed for %s\n",
1019 str != NULL ? str : "no relevant certificate");
1020 OPENSSL_free(str);
1021 }
1022 return (verified);
1023 }
1024
1025 #endif
1026
1027 /*
1028 * Enable SSL on a connection.
1029 */
1030 int
fetch_ssl(conn_t * conn,const struct url * URL,int verbose)1031 fetch_ssl(conn_t *conn, const struct url *URL, int verbose)
1032 {
1033 #ifdef WITH_SSL
1034 int ret, ssl_err;
1035 X509_NAME *name;
1036 char *str;
1037
1038 /* Init the SSL library and context */
1039 if (!SSL_library_init()){
1040 fprintf(stderr, "SSL library init failed\n");
1041 return (-1);
1042 }
1043
1044 SSL_load_error_strings();
1045
1046 conn->ssl_meth = SSLv23_client_method();
1047 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
1048 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY);
1049
1050 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose);
1051 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose))
1052 return (-1);
1053 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose))
1054 return (-1);
1055
1056 conn->ssl = SSL_new(conn->ssl_ctx);
1057 if (conn->ssl == NULL) {
1058 fprintf(stderr, "SSL context creation failed\n");
1059 return (-1);
1060 }
1061 SSL_set_fd(conn->ssl, conn->sd);
1062
1063 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT)
1064 if (!SSL_set_tlsext_host_name(conn->ssl,
1065 __DECONST(struct url *, URL)->host)) {
1066 fprintf(stderr,
1067 "TLS server name indication extension failed for host %s\n",
1068 URL->host);
1069 return (-1);
1070 }
1071 #endif
1072 while ((ret = SSL_connect(conn->ssl)) == -1) {
1073 ssl_err = SSL_get_error(conn->ssl, ret);
1074 if (ssl_err != SSL_ERROR_WANT_READ &&
1075 ssl_err != SSL_ERROR_WANT_WRITE) {
1076 ERR_print_errors_fp(stderr);
1077 return (-1);
1078 }
1079 }
1080 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
1081
1082 if (conn->ssl_cert == NULL) {
1083 fprintf(stderr, "No server SSL certificate\n");
1084 return (-1);
1085 }
1086
1087 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) {
1088 if (verbose)
1089 fetch_info("Verify hostname");
1090 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) {
1091 fprintf(stderr,
1092 "SSL certificate subject doesn't match host %s\n",
1093 URL->host);
1094 return (-1);
1095 }
1096 }
1097
1098 if (verbose) {
1099 fetch_info("%s connection established using %s",
1100 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl));
1101 name = X509_get_subject_name(conn->ssl_cert);
1102 str = X509_NAME_oneline(name, 0, 0);
1103 fetch_info("Certificate subject: %s", str);
1104 OPENSSL_free(str);
1105 name = X509_get_issuer_name(conn->ssl_cert);
1106 str = X509_NAME_oneline(name, 0, 0);
1107 fetch_info("Certificate issuer: %s", str);
1108 OPENSSL_free(str);
1109 }
1110
1111 return (0);
1112 #else
1113 (void)conn;
1114 (void)verbose;
1115 (void)URL;
1116 fprintf(stderr, "SSL support disabled\n");
1117 return (-1);
1118 #endif
1119 }
1120
1121 #define FETCH_READ_WAIT -2
1122 #define FETCH_READ_ERROR -1
1123 #define FETCH_READ_DONE 0
1124
1125 #ifdef WITH_SSL
1126 static ssize_t
fetch_ssl_read(SSL * ssl,char * buf,size_t len)1127 fetch_ssl_read(SSL *ssl, char *buf, size_t len)
1128 {
1129 ssize_t rlen;
1130 int ssl_err;
1131
1132 rlen = SSL_read(ssl, buf, len);
1133 if (rlen < 0) {
1134 ssl_err = SSL_get_error(ssl, rlen);
1135 if (ssl_err == SSL_ERROR_WANT_READ ||
1136 ssl_err == SSL_ERROR_WANT_WRITE) {
1137 return (FETCH_READ_WAIT);
1138 } else {
1139 ERR_print_errors_fp(stderr);
1140 return (FETCH_READ_ERROR);
1141 }
1142 }
1143 return (rlen);
1144 }
1145 #endif
1146
1147 static ssize_t
fetch_socket_read(int sd,char * buf,size_t len)1148 fetch_socket_read(int sd, char *buf, size_t len)
1149 {
1150 ssize_t rlen;
1151
1152 rlen = read(sd, buf, len);
1153 if (rlen < 0) {
1154 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls))
1155 return (FETCH_READ_WAIT);
1156 else
1157 return (FETCH_READ_ERROR);
1158 }
1159 return (rlen);
1160 }
1161
1162 /*
1163 * Read a character from a connection w/ timeout
1164 */
1165 ssize_t
fetch_read(conn_t * conn,char * buf,size_t len)1166 fetch_read(conn_t *conn, char *buf, size_t len)
1167 {
1168 struct timeval now, timeout, delta;
1169 struct pollfd pfd;
1170 ssize_t rlen;
1171 int deltams;
1172
1173 if (fetchTimeout > 0) {
1174 gettimeofday(&timeout, NULL);
1175 timeout.tv_sec += fetchTimeout;
1176 }
1177
1178 deltams = INFTIM;
1179 memset(&pfd, 0, sizeof pfd);
1180 pfd.fd = conn->sd;
1181 pfd.events = POLLIN | POLLERR;
1182
1183 for (;;) {
1184 /*
1185 * The socket is non-blocking. Instead of the canonical
1186 * poll() -> read(), we do the following:
1187 *
1188 * 1) call read() or SSL_read().
1189 * 2) if we received some data, return it.
1190 * 3) if an error occurred, return -1.
1191 * 4) if read() or SSL_read() signaled EOF, return.
1192 * 5) if we did not receive any data but we're not at EOF,
1193 * call poll().
1194 *
1195 * In the SSL case, this is necessary because if we
1196 * receive a close notification, we have to call
1197 * SSL_read() one additional time after we've read
1198 * everything we received.
1199 *
1200 * In the non-SSL case, it may improve performance (very
1201 * slightly) when reading small amounts of data.
1202 */
1203 #ifdef WITH_SSL
1204 if (conn->ssl != NULL)
1205 rlen = fetch_ssl_read(conn->ssl, buf, len);
1206 else
1207 #endif
1208 rlen = fetch_socket_read(conn->sd, buf, len);
1209 if (rlen >= 0) {
1210 break;
1211 } else if (rlen == FETCH_READ_ERROR) {
1212 fetch_syserr();
1213 return (-1);
1214 }
1215 // assert(rlen == FETCH_READ_WAIT);
1216 if (fetchTimeout > 0) {
1217 gettimeofday(&now, NULL);
1218 if (!timercmp(&timeout, &now, >)) {
1219 errno = ETIMEDOUT;
1220 fetch_syserr();
1221 return (-1);
1222 }
1223 timersub(&timeout, &now, &delta);
1224 deltams = delta.tv_sec * 1000 +
1225 delta.tv_usec / 1000;;
1226 }
1227 errno = 0;
1228 pfd.revents = 0;
1229 if (poll(&pfd, 1, deltams) < 0) {
1230 if (errno == EINTR && fetchRestartCalls)
1231 continue;
1232 fetch_syserr();
1233 return (-1);
1234 }
1235 }
1236 return (rlen);
1237 }
1238
1239
1240 /*
1241 * Read a line of text from a connection w/ timeout
1242 */
1243 #define MIN_BUF_SIZE 1024
1244
1245 int
fetch_getln(conn_t * conn)1246 fetch_getln(conn_t *conn)
1247 {
1248 char *tmp;
1249 size_t tmpsize;
1250 ssize_t len;
1251 char c;
1252
1253 if (conn->buf == NULL) {
1254 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) {
1255 errno = ENOMEM;
1256 return (-1);
1257 }
1258 conn->bufsize = MIN_BUF_SIZE;
1259 }
1260
1261 conn->buf[0] = '\0';
1262 conn->buflen = 0;
1263
1264 do {
1265 len = fetch_read(conn, &c, 1);
1266 if (len == -1)
1267 return (-1);
1268 if (len == 0)
1269 break;
1270 conn->buf[conn->buflen++] = c;
1271 if (conn->buflen == conn->bufsize) {
1272 tmp = conn->buf;
1273 tmpsize = conn->bufsize * 2 + 1;
1274 if ((tmp = realloc(tmp, tmpsize)) == NULL) {
1275 errno = ENOMEM;
1276 return (-1);
1277 }
1278 conn->buf = tmp;
1279 conn->bufsize = tmpsize;
1280 }
1281 } while (c != '\n');
1282
1283 conn->buf[conn->buflen] = '\0';
1284 DEBUGF("<<< %s", conn->buf);
1285 return (0);
1286 }
1287
1288
1289 /*
1290 * Write to a connection w/ timeout
1291 */
1292 ssize_t
fetch_write(conn_t * conn,const char * buf,size_t len)1293 fetch_write(conn_t *conn, const char *buf, size_t len)
1294 {
1295 struct iovec iov;
1296
1297 iov.iov_base = __DECONST(char *, buf);
1298 iov.iov_len = len;
1299 return fetch_writev(conn, &iov, 1);
1300 }
1301
1302 /*
1303 * Write a vector to a connection w/ timeout
1304 * Note: can modify the iovec.
1305 */
1306 ssize_t
fetch_writev(conn_t * conn,struct iovec * iov,int iovcnt)1307 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt)
1308 {
1309 struct timeval now, timeout, delta;
1310 struct pollfd pfd;
1311 ssize_t wlen, total;
1312 int deltams;
1313
1314 memset(&pfd, 0, sizeof pfd);
1315 if (fetchTimeout) {
1316 pfd.fd = conn->sd;
1317 pfd.events = POLLOUT | POLLERR;
1318 gettimeofday(&timeout, NULL);
1319 timeout.tv_sec += fetchTimeout;
1320 }
1321
1322 total = 0;
1323 while (iovcnt > 0) {
1324 while (fetchTimeout && pfd.revents == 0) {
1325 gettimeofday(&now, NULL);
1326 if (!timercmp(&timeout, &now, >)) {
1327 errno = ETIMEDOUT;
1328 fetch_syserr();
1329 return (-1);
1330 }
1331 timersub(&timeout, &now, &delta);
1332 deltams = delta.tv_sec * 1000 +
1333 delta.tv_usec / 1000;
1334 errno = 0;
1335 pfd.revents = 0;
1336 if (poll(&pfd, 1, deltams) < 0) {
1337 /* POSIX compliance */
1338 if (errno == EAGAIN)
1339 continue;
1340 if (errno == EINTR && fetchRestartCalls)
1341 continue;
1342 return (-1);
1343 }
1344 }
1345 errno = 0;
1346 #ifdef WITH_SSL
1347 if (conn->ssl != NULL)
1348 wlen = SSL_write(conn->ssl,
1349 iov->iov_base, iov->iov_len);
1350 else
1351 #endif
1352 wlen = writev(conn->sd, iov, iovcnt);
1353 if (wlen == 0) {
1354 /* we consider a short write a failure */
1355 /* XXX perhaps we shouldn't in the SSL case */
1356 errno = EPIPE;
1357 fetch_syserr();
1358 return (-1);
1359 }
1360 if (wlen < 0) {
1361 if (errno == EINTR && fetchRestartCalls)
1362 continue;
1363 return (-1);
1364 }
1365 total += wlen;
1366 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) {
1367 wlen -= iov->iov_len;
1368 iov++;
1369 iovcnt--;
1370 }
1371 if (iovcnt > 0) {
1372 iov->iov_len -= wlen;
1373 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen;
1374 }
1375 }
1376 return (total);
1377 }
1378
1379
1380 /*
1381 * Write a line of text to a connection w/ timeout
1382 */
1383 int
fetch_putln(conn_t * conn,const char * str,size_t len)1384 fetch_putln(conn_t *conn, const char *str, size_t len)
1385 {
1386 struct iovec iov[2];
1387 int ret;
1388
1389 DEBUGF(">>> %s\n", str);
1390 iov[0].iov_base = __DECONST(char *, str);
1391 iov[0].iov_len = len;
1392 iov[1].iov_base = __DECONST(char *, ENDL);
1393 iov[1].iov_len = sizeof(ENDL);
1394 if (len == 0)
1395 ret = fetch_writev(conn, &iov[1], 1);
1396 else
1397 ret = fetch_writev(conn, iov, 2);
1398 if (ret == -1)
1399 return (-1);
1400 return (0);
1401 }
1402
1403
1404 /*
1405 * Close connection
1406 */
1407 int
fetch_close(conn_t * conn)1408 fetch_close(conn_t *conn)
1409 {
1410 int ret;
1411
1412 if (--conn->ref > 0)
1413 return (0);
1414 #ifdef WITH_SSL
1415 if (conn->ssl) {
1416 SSL_shutdown(conn->ssl);
1417 SSL_set_connect_state(conn->ssl);
1418 SSL_free(conn->ssl);
1419 conn->ssl = NULL;
1420 }
1421 if (conn->ssl_ctx) {
1422 SSL_CTX_free(conn->ssl_ctx);
1423 conn->ssl_ctx = NULL;
1424 }
1425 if (conn->ssl_cert) {
1426 X509_free(conn->ssl_cert);
1427 conn->ssl_cert = NULL;
1428 }
1429 #endif
1430 ret = close(conn->sd);
1431 free(conn->buf);
1432 free(conn);
1433 return (ret);
1434 }
1435
1436
1437 /*** Directory-related utility functions *************************************/
1438
1439 int
fetch_add_entry(struct url_ent ** p,int * size,int * len,const char * name,struct url_stat * us)1440 fetch_add_entry(struct url_ent **p, int *size, int *len,
1441 const char *name, struct url_stat *us)
1442 {
1443 struct url_ent *tmp;
1444
1445 if (*p == NULL) {
1446 *size = 0;
1447 *len = 0;
1448 }
1449
1450 if (*len >= *size - 1) {
1451 #if !HAVE_REALLOCARRAY
1452 tmp = realloc(*p, (*size * 2 + 1) * sizeof(**p));
1453 #else
1454 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p));
1455 #endif
1456 if (tmp == NULL) {
1457 errno = ENOMEM;
1458 fetch_syserr();
1459 return (-1);
1460 }
1461 *size = (*size * 2 + 1);
1462 *p = tmp;
1463 }
1464
1465 tmp = *p + *len;
1466 snprintf(tmp->name, PATH_MAX, "%s", name);
1467 memcpy(&tmp->stat, us, sizeof(*us));
1468
1469 (*len)++;
1470 (++tmp)->name[0] = 0;
1471
1472 return (0);
1473 }
1474
1475
1476 /*** Authentication-related utility functions ********************************/
1477
1478 static const char *
fetch_read_word(FILE * f)1479 fetch_read_word(FILE *f)
1480 {
1481 static char word[1024];
1482
1483 if (fscanf(f, " %1023s ", word) != 1)
1484 return (NULL);
1485 return (word);
1486 }
1487
1488 static int
fetch_netrc_open(void)1489 fetch_netrc_open(void)
1490 {
1491 struct passwd *pwd;
1492 char fn[PATH_MAX];
1493 const char *p;
1494 int fd, serrno;
1495
1496 if ((p = getenv("NETRC")) != NULL) {
1497 DEBUGF("NETRC=%s\n", p);
1498 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) {
1499 fetch_info("$NETRC specifies a file name "
1500 "longer than PATH_MAX");
1501 return (-1);
1502 }
1503 } else {
1504 if ((p = getenv("HOME")) == NULL) {
1505 if ((pwd = getpwuid(getuid())) == NULL ||
1506 (p = pwd->pw_dir) == NULL)
1507 return (-1);
1508 }
1509 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn))
1510 return (-1);
1511 }
1512
1513 if ((fd = open(fn, O_RDONLY)) < 0) {
1514 serrno = errno;
1515 DEBUGF("%s: %s\n", fn, strerror(serrno));
1516 errno = serrno;
1517 }
1518 return (fd);
1519 }
1520
1521 /*
1522 * Get authentication data for a URL from .netrc
1523 */
1524 int
fetch_netrc_auth(struct url * url)1525 fetch_netrc_auth(struct url *url)
1526 {
1527 const char *word;
1528 int serrno;
1529 FILE *f;
1530
1531 if (url->netrcfd < 0)
1532 url->netrcfd = fetch_netrc_open();
1533 if (url->netrcfd < 0)
1534 return (-1);
1535 if ((f = fdopen(url->netrcfd, "r")) == NULL) {
1536 serrno = errno;
1537 DEBUGF("fdopen(netrcfd): %s", strerror(errno));
1538 close(url->netrcfd);
1539 url->netrcfd = -1;
1540 errno = serrno;
1541 return (-1);
1542 }
1543 rewind(f);
1544 DEBUGF("searching netrc for %s\n", url->host);
1545 while ((word = fetch_read_word(f)) != NULL) {
1546 if (strcmp(word, "default") == 0) {
1547 DEBUGF("using default netrc settings\n");
1548 break;
1549 }
1550 if (strcmp(word, "machine") == 0 &&
1551 (word = fetch_read_word(f)) != NULL &&
1552 strcasecmp(word, url->host) == 0) {
1553 DEBUGF("using netrc settings for %s\n", word);
1554 break;
1555 }
1556 }
1557 if (word == NULL)
1558 goto ferr;
1559 while ((word = fetch_read_word(f)) != NULL) {
1560 if (strcmp(word, "login") == 0) {
1561 if ((word = fetch_read_word(f)) == NULL)
1562 goto ferr;
1563 if (snprintf(url->user, sizeof(url->user),
1564 "%s", word) > (int)sizeof(url->user)) {
1565 fetch_info("login name in .netrc is too long");
1566 url->user[0] = '\0';
1567 }
1568 } else if (strcmp(word, "password") == 0) {
1569 if ((word = fetch_read_word(f)) == NULL)
1570 goto ferr;
1571 if (snprintf(url->pwd, sizeof(url->pwd),
1572 "%s", word) > (int)sizeof(url->pwd)) {
1573 fetch_info("password in .netrc is too long");
1574 url->pwd[0] = '\0';
1575 }
1576 } else if (strcmp(word, "account") == 0) {
1577 if ((word = fetch_read_word(f)) == NULL)
1578 goto ferr;
1579 /* XXX not supported! */
1580 } else {
1581 break;
1582 }
1583 }
1584 fclose(f);
1585 url->netrcfd = -1;
1586 return (0);
1587 ferr:
1588 serrno = errno;
1589 fclose(f);
1590 url->netrcfd = -1;
1591 errno = serrno;
1592 return (-1);
1593 }
1594
1595 /*
1596 * The no_proxy environment variable specifies a set of domains for
1597 * which the proxy should not be consulted; the contents is a comma-,
1598 * or space-separated list of domain names. A single asterisk will
1599 * override all proxy variables and no transactions will be proxied
1600 * (for compatibility with lynx and curl, see the discussion at
1601 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>).
1602 */
1603 int
fetch_no_proxy_match(const char * host)1604 fetch_no_proxy_match(const char *host)
1605 {
1606 const char *no_proxy, *p, *q;
1607 size_t h_len, d_len;
1608
1609 if ((no_proxy = getenv("NO_PROXY")) == NULL &&
1610 (no_proxy = getenv("no_proxy")) == NULL)
1611 return (0);
1612
1613 /* asterisk matches any hostname */
1614 if (strcmp(no_proxy, "*") == 0)
1615 return (1);
1616
1617 h_len = strlen(host);
1618 p = no_proxy;
1619 do {
1620 /* position p at the beginning of a domain suffix */
1621 while (*p == ',' || isspace((unsigned char)*p))
1622 p++;
1623
1624 /* position q at the first separator character */
1625 for (q = p; *q; ++q)
1626 if (*q == ',' || isspace((unsigned char)*q))
1627 break;
1628
1629 d_len = q - p;
1630 if (d_len > 0 && h_len >= d_len &&
1631 strncasecmp(host + h_len - d_len,
1632 p, d_len) == 0) {
1633 /* domain name matches */
1634 return (1);
1635 }
1636
1637 p = q + 1;
1638 } while (*q);
1639
1640 return (0);
1641 }
1642