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 __FBSDID("$FreeBSD: stable/12/lib/libfetch/common.c 373238 2023-10-05 16:01:02Z des $");
34
35 #include <sys/param.h>
36 #include <sys/socket.h>
37 #include <sys/time.h>
38 #include <sys/uio.h>
39
40 #include <netinet/in.h>
41
42 #include <ctype.h>
43 #include <errno.h>
44 #include <fcntl.h>
45 #include <netdb.h>
46 #include <poll.h>
47 #include <pwd.h>
48 #include <stdarg.h>
49 #include <stdlib.h>
50 #include <stdio.h>
51 #include <string.h>
52 #include <unistd.h>
53
54 #ifdef WITH_SSL
55 #include <openssl/x509v3.h>
56 #endif
57
58 #include "fetch.h"
59 #include "common.h"
60
61
62 /*** Local data **************************************************************/
63
64 /*
65 * Error messages for resolver errors
66 */
67 static struct fetcherr netdb_errlist[] = {
68 #ifdef EAI_NODATA
69 { EAI_NODATA, FETCH_RESOLV, "Host not found" },
70 #endif
71 { EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" },
72 { EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" },
73 { EAI_NONAME, FETCH_RESOLV, "No address record" },
74 { -1, FETCH_UNKNOWN, "Unknown resolver error" }
75 };
76
77 /* End-of-Line */
78 static const char ENDL[2] = "\r\n";
79
80
81 /*** Error-reporting functions ***********************************************/
82
83 /*
84 * Map error code to string
85 */
86 static struct fetcherr *
fetch_finderr(struct fetcherr * p,int e)87 fetch_finderr(struct fetcherr *p, int e)
88 {
89 while (p->num != -1 && p->num != e)
90 p++;
91 return (p);
92 }
93
94 /*
95 * Set error code
96 */
97 void
fetch_seterr(struct fetcherr * p,int e)98 fetch_seterr(struct fetcherr *p, int e)
99 {
100 p = fetch_finderr(p, e);
101 fetchLastErrCode = p->cat;
102 snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string);
103 }
104
105 /*
106 * Set error code according to errno
107 */
108 void
fetch_syserr(void)109 fetch_syserr(void)
110 {
111 switch (errno) {
112 case 0:
113 fetchLastErrCode = FETCH_OK;
114 break;
115 case EPERM:
116 case EACCES:
117 case EROFS:
118 case EAUTH:
119 case ENEEDAUTH:
120 fetchLastErrCode = FETCH_AUTH;
121 break;
122 case ENOENT:
123 case EISDIR: /* XXX */
124 fetchLastErrCode = FETCH_UNAVAIL;
125 break;
126 case ENOMEM:
127 fetchLastErrCode = FETCH_MEMORY;
128 break;
129 case EBUSY:
130 case EAGAIN:
131 fetchLastErrCode = FETCH_TEMP;
132 break;
133 case EEXIST:
134 fetchLastErrCode = FETCH_EXISTS;
135 break;
136 case ENOSPC:
137 fetchLastErrCode = FETCH_FULL;
138 break;
139 case EADDRINUSE:
140 case EADDRNOTAVAIL:
141 case ENETDOWN:
142 case ENETUNREACH:
143 case ENETRESET:
144 case EHOSTUNREACH:
145 fetchLastErrCode = FETCH_NETWORK;
146 break;
147 case ECONNABORTED:
148 case ECONNRESET:
149 fetchLastErrCode = FETCH_ABORT;
150 break;
151 case ETIMEDOUT:
152 fetchLastErrCode = FETCH_TIMEOUT;
153 break;
154 case ECONNREFUSED:
155 case EHOSTDOWN:
156 fetchLastErrCode = FETCH_DOWN;
157 break;
158 default:
159 fetchLastErrCode = FETCH_UNKNOWN;
160 }
161 snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno));
162 }
163
164
165 /*
166 * Emit status message
167 */
168 void
fetch_info(const char * fmt,...)169 fetch_info(const char *fmt, ...)
170 {
171 va_list ap;
172
173 va_start(ap, fmt);
174 vfprintf(stderr, fmt, ap);
175 va_end(ap);
176 fputc('\n', stderr);
177 }
178
179
180 /*** Network-related utility functions ***************************************/
181
182 /*
183 * Return the default port for a scheme
184 */
185 int
fetch_default_port(const char * scheme)186 fetch_default_port(const char *scheme)
187 {
188 struct servent *se;
189
190 if ((se = getservbyname(scheme, "tcp")) != NULL)
191 return (ntohs(se->s_port));
192 if (strcmp(scheme, SCHEME_FTP) == 0)
193 return (FTP_DEFAULT_PORT);
194 if (strcmp(scheme, SCHEME_HTTP) == 0)
195 return (HTTP_DEFAULT_PORT);
196 return (0);
197 }
198
199 /*
200 * Return the default proxy port for a scheme
201 */
202 int
fetch_default_proxy_port(const char * scheme)203 fetch_default_proxy_port(const char *scheme)
204 {
205 if (strcmp(scheme, SCHEME_FTP) == 0)
206 return (FTP_DEFAULT_PROXY_PORT);
207 if (strcmp(scheme, SCHEME_HTTP) == 0)
208 return (HTTP_DEFAULT_PROXY_PORT);
209 return (0);
210 }
211
212
213 /*
214 * Create a connection for an existing descriptor.
215 */
216 conn_t *
fetch_reopen(int sd)217 fetch_reopen(int sd)
218 {
219 conn_t *conn;
220 int opt = 1;
221
222 /* allocate and fill connection structure */
223 if ((conn = calloc(1, sizeof(*conn))) == NULL)
224 return (NULL);
225 fcntl(sd, F_SETFD, FD_CLOEXEC);
226 setsockopt(sd, SOL_SOCKET, SO_NOSIGPIPE, &opt, sizeof opt);
227 conn->sd = sd;
228 ++conn->ref;
229 return (conn);
230 }
231
232
233 /*
234 * Bump a connection's reference count.
235 */
236 conn_t *
fetch_ref(conn_t * conn)237 fetch_ref(conn_t *conn)
238 {
239
240 ++conn->ref;
241 return (conn);
242 }
243
244
245 /*
246 * Resolve an address
247 */
248 struct addrinfo *
fetch_resolve(const char * addr,int port,int af)249 fetch_resolve(const char *addr, int port, int af)
250 {
251 char hbuf[256], sbuf[8];
252 struct addrinfo hints, *res;
253 const char *hb, *he, *sep;
254 const char *host, *service;
255 int err, len;
256
257 /* first, check for a bracketed IPv6 address */
258 if (*addr == '[') {
259 hb = addr + 1;
260 if ((sep = strchr(hb, ']')) == NULL) {
261 errno = EINVAL;
262 goto syserr;
263 }
264 he = sep++;
265 } else {
266 hb = addr;
267 sep = strchrnul(hb, ':');
268 he = sep;
269 }
270
271 /* see if we need to copy the host name */
272 if (*he != '\0') {
273 len = snprintf(hbuf, sizeof(hbuf),
274 "%.*s", (int)(he - hb), hb);
275 if (len < 0)
276 goto syserr;
277 if (len >= (int)sizeof(hbuf)) {
278 errno = ENAMETOOLONG;
279 goto syserr;
280 }
281 host = hbuf;
282 } else {
283 host = hb;
284 }
285
286 /* was it followed by a service name? */
287 if (*sep == '\0' && port != 0) {
288 if (port < 1 || port > 65535) {
289 errno = EINVAL;
290 goto syserr;
291 }
292 if (snprintf(sbuf, sizeof(sbuf), "%d", port) < 0)
293 goto syserr;
294 service = sbuf;
295 } else if (*sep != '\0') {
296 service = sep + 1;
297 } else {
298 service = NULL;
299 }
300
301 /* resolve */
302 memset(&hints, 0, sizeof(hints));
303 hints.ai_family = af;
304 hints.ai_socktype = SOCK_STREAM;
305 hints.ai_flags = AI_ADDRCONFIG;
306 if ((err = getaddrinfo(host, service, &hints, &res)) != 0) {
307 netdb_seterr(err);
308 return (NULL);
309 }
310 return (res);
311 syserr:
312 fetch_syserr();
313 return (NULL);
314 }
315
316
317
318 /*
319 * Bind a socket to a specific local address
320 */
321 int
fetch_bind(int sd,int af,const char * addr)322 fetch_bind(int sd, int af, const char *addr)
323 {
324 struct addrinfo *cliai, *ai;
325 int err;
326
327 if ((cliai = fetch_resolve(addr, 0, af)) == NULL)
328 return (-1);
329 for (ai = cliai; ai != NULL; ai = ai->ai_next)
330 if ((err = bind(sd, ai->ai_addr, ai->ai_addrlen)) == 0)
331 break;
332 if (err != 0)
333 fetch_syserr();
334 freeaddrinfo(cliai);
335 return (err == 0 ? 0 : -1);
336 }
337
338
339 /*
340 * Establish a TCP connection to the specified port on the specified host.
341 */
342 conn_t *
fetch_connect(const char * host,int port,int af,int verbose)343 fetch_connect(const char *host, int port, int af, int verbose)
344 {
345 struct addrinfo *cais = NULL, *sais = NULL, *cai, *sai;
346 const char *bindaddr;
347 conn_t *conn = NULL;
348 int err = 0, sd = -1;
349
350 DEBUGF("---> %s:%d\n", host, port);
351
352 /* resolve server address */
353 if (verbose)
354 fetch_info("resolving server address: %s:%d", host, port);
355 if ((sais = fetch_resolve(host, port, af)) == NULL)
356 goto fail;
357
358 /* resolve client address */
359 bindaddr = getenv("FETCH_BIND_ADDRESS");
360 if (bindaddr != NULL && *bindaddr != '\0') {
361 if (verbose)
362 fetch_info("resolving client address: %s", bindaddr);
363 if ((cais = fetch_resolve(bindaddr, 0, af)) == NULL)
364 goto fail;
365 }
366
367 /* try each server address in turn */
368 for (err = 0, sai = sais; sai != NULL; sai = sai->ai_next) {
369 /* open socket */
370 if ((sd = socket(sai->ai_family, SOCK_STREAM, 0)) < 0)
371 goto syserr;
372 /* attempt to bind to client address */
373 for (err = 0, cai = cais; cai != NULL; cai = cai->ai_next) {
374 if (cai->ai_family != sai->ai_family)
375 continue;
376 if ((err = bind(sd, cai->ai_addr, cai->ai_addrlen)) == 0)
377 break;
378 }
379 if (err != 0) {
380 if (verbose)
381 fetch_info("failed to bind to %s", bindaddr);
382 goto syserr;
383 }
384 /* attempt to connect to server address */
385 if ((err = connect(sd, sai->ai_addr, sai->ai_addrlen)) == 0)
386 break;
387 /* clean up before next attempt */
388 close(sd);
389 sd = -1;
390 }
391 if (err != 0) {
392 if (verbose)
393 fetch_info("failed to connect to %s:%d", host, port);
394 goto syserr;
395 }
396
397 if ((conn = fetch_reopen(sd)) == NULL)
398 goto syserr;
399 if (cais != NULL)
400 freeaddrinfo(cais);
401 if (sais != NULL)
402 freeaddrinfo(sais);
403 return (conn);
404 syserr:
405 fetch_syserr();
406 goto fail;
407 fail:
408 if (sd >= 0)
409 close(sd);
410 if (cais != NULL)
411 freeaddrinfo(cais);
412 if (sais != NULL)
413 freeaddrinfo(sais);
414 return (NULL);
415 }
416
417 #ifdef WITH_SSL
418 /*
419 * Convert characters A-Z to lowercase (intentionally avoid any locale
420 * specific conversions).
421 */
422 static char
fetch_ssl_tolower(char in)423 fetch_ssl_tolower(char in)
424 {
425 if (in >= 'A' && in <= 'Z')
426 return (in + 32);
427 else
428 return (in);
429 }
430
431 /*
432 * isalpha implementation that intentionally avoids any locale specific
433 * conversions.
434 */
435 static int
fetch_ssl_isalpha(char in)436 fetch_ssl_isalpha(char in)
437 {
438 return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z'));
439 }
440
441 /*
442 * Check if passed hostnames a and b are equal.
443 */
444 static int
fetch_ssl_hname_equal(const char * a,size_t alen,const char * b,size_t blen)445 fetch_ssl_hname_equal(const char *a, size_t alen, const char *b,
446 size_t blen)
447 {
448 size_t i;
449
450 if (alen != blen)
451 return (0);
452 for (i = 0; i < alen; ++i) {
453 if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i]))
454 return (0);
455 }
456 return (1);
457 }
458
459 /*
460 * Check if domain label is traditional, meaning that only A-Z, a-z, 0-9
461 * and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha-
462 * numeric characters. Double hyphens (like they're found in IDN a-labels
463 * 'xn--') are not allowed. Empty labels are invalid.
464 */
465 static int
fetch_ssl_is_trad_domain_label(const char * l,size_t len,int wcok)466 fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok)
467 {
468 size_t i;
469
470 if (!len || l[0] == '-' || l[len-1] == '-')
471 return (0);
472 for (i = 0; i < len; ++i) {
473 if (!isdigit(l[i]) &&
474 !fetch_ssl_isalpha(l[i]) &&
475 !(l[i] == '*' && wcok) &&
476 !(l[i] == '-' && l[i - 1] != '-'))
477 return (0);
478 }
479 return (1);
480 }
481
482 /*
483 * Check if host name consists only of numbers. This might indicate an IP
484 * address, which is not a good idea for CN wildcard comparison.
485 */
486 static int
fetch_ssl_hname_is_only_numbers(const char * hostname,size_t len)487 fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len)
488 {
489 size_t i;
490
491 for (i = 0; i < len; ++i) {
492 if (!((hostname[i] >= '0' && hostname[i] <= '9') ||
493 hostname[i] == '.'))
494 return (0);
495 }
496 return (1);
497 }
498
499 /*
500 * Check if the host name h passed matches the pattern passed in m which
501 * is usually part of subjectAltName or CN of a certificate presented to
502 * the client. This includes wildcard matching. The algorithm is based on
503 * RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280.
504 */
505 static int
fetch_ssl_hname_match(const char * h,size_t hlen,const char * m,size_t mlen)506 fetch_ssl_hname_match(const char *h, size_t hlen, const char *m,
507 size_t mlen)
508 {
509 int delta, hdotidx, mdot1idx, wcidx;
510 const char *hdot, *mdot1, *mdot2;
511 const char *wc; /* wildcard */
512
513 if (!(h && *h && m && *m))
514 return (0);
515 if ((wc = strnstr(m, "*", mlen)) == NULL)
516 return (fetch_ssl_hname_equal(h, hlen, m, mlen));
517 wcidx = wc - m;
518 /* hostname should not be just dots and numbers */
519 if (fetch_ssl_hname_is_only_numbers(h, hlen))
520 return (0);
521 /* only one wildcard allowed in pattern */
522 if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL)
523 return (0);
524 /*
525 * there must be at least two more domain labels and
526 * wildcard has to be in the leftmost label (RFC6125)
527 */
528 mdot1 = strnstr(m, ".", mlen);
529 if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4)
530 return (0);
531 mdot1idx = mdot1 - m;
532 mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1);
533 if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2)
534 return (0);
535 /* hostname must contain a dot and not be the 1st char */
536 hdot = strnstr(h, ".", hlen);
537 if (hdot == NULL || hdot == h)
538 return (0);
539 hdotidx = hdot - h;
540 /*
541 * host part of hostname must be at least as long as
542 * pattern it's supposed to match
543 */
544 if (hdotidx < mdot1idx)
545 return (0);
546 /*
547 * don't allow wildcards in non-traditional domain names
548 * (IDN, A-label, U-label...)
549 */
550 if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) ||
551 !fetch_ssl_is_trad_domain_label(m, mdot1idx, 1))
552 return (0);
553 /* match domain part (part after first dot) */
554 if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1,
555 mlen - mdot1idx))
556 return (0);
557 /* match part left of wildcard */
558 if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx))
559 return (0);
560 /* match part right of wildcard */
561 delta = mdot1idx - wcidx - 1;
562 if (!fetch_ssl_hname_equal(hdot - delta, delta,
563 mdot1 - delta, delta))
564 return (0);
565 /* all tests succeeded, it's a match */
566 return (1);
567 }
568
569 /*
570 * Get numeric host address info - returns NULL if host was not an IP
571 * address. The caller is responsible for deallocation using
572 * freeaddrinfo(3).
573 */
574 static struct addrinfo *
fetch_ssl_get_numeric_addrinfo(const char * hostname,size_t len)575 fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len)
576 {
577 struct addrinfo hints, *res;
578 char *host;
579
580 host = (char *)malloc(len + 1);
581 memcpy(host, hostname, len);
582 host[len] = '\0';
583 memset(&hints, 0, sizeof(hints));
584 hints.ai_family = PF_UNSPEC;
585 hints.ai_socktype = SOCK_STREAM;
586 hints.ai_protocol = 0;
587 hints.ai_flags = AI_NUMERICHOST;
588 /* port is not relevant for this purpose */
589 if (getaddrinfo(host, "443", &hints, &res) != 0)
590 res = NULL;
591 free(host);
592 return res;
593 }
594
595 /*
596 * Compare ip address in addrinfo with address passes.
597 */
598 static int
fetch_ssl_ipaddr_match_bin(const struct addrinfo * lhost,const char * rhost,size_t rhostlen)599 fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost,
600 size_t rhostlen)
601 {
602 const void *left;
603
604 if (lhost->ai_family == AF_INET && rhostlen == 4) {
605 left = (void *)&((struct sockaddr_in*)(void *)
606 lhost->ai_addr)->sin_addr.s_addr;
607 #ifdef INET6
608 } else if (lhost->ai_family == AF_INET6 && rhostlen == 16) {
609 left = (void *)&((struct sockaddr_in6 *)(void *)
610 lhost->ai_addr)->sin6_addr;
611 #endif
612 } else
613 return (0);
614 return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0);
615 }
616
617 /*
618 * Compare ip address in addrinfo with host passed. If host is not an IP
619 * address, comparison will fail.
620 */
621 static int
fetch_ssl_ipaddr_match(const struct addrinfo * laddr,const char * r,size_t rlen)622 fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r,
623 size_t rlen)
624 {
625 struct addrinfo *raddr;
626 int ret;
627 char *rip;
628
629 ret = 0;
630 if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL)
631 return 0; /* not a numeric host */
632
633 if (laddr->ai_family == raddr->ai_family) {
634 if (laddr->ai_family == AF_INET) {
635 rip = (char *)&((struct sockaddr_in *)(void *)
636 raddr->ai_addr)->sin_addr.s_addr;
637 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4);
638 #ifdef INET6
639 } else if (laddr->ai_family == AF_INET6) {
640 rip = (char *)&((struct sockaddr_in6 *)(void *)
641 raddr->ai_addr)->sin6_addr;
642 ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16);
643 #endif
644 }
645
646 }
647 freeaddrinfo(raddr);
648 return (ret);
649 }
650
651 /*
652 * Verify server certificate by subjectAltName.
653 */
654 static int
fetch_ssl_verify_altname(STACK_OF (GENERAL_NAME)* altnames,const char * host,struct addrinfo * ip)655 fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames,
656 const char *host, struct addrinfo *ip)
657 {
658 const GENERAL_NAME *name;
659 size_t nslen;
660 int i;
661 const char *ns;
662
663 for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) {
664 #if OPENSSL_VERSION_NUMBER < 0x10000000L
665 /*
666 * This is a workaround, since the following line causes
667 * alignment issues in clang:
668 * name = sk_GENERAL_NAME_value(altnames, i);
669 * OpenSSL explicitly warns not to use those macros
670 * directly, but there isn't much choice (and there
671 * shouldn't be any ill side effects)
672 */
673 name = (GENERAL_NAME *)SKM_sk_value(void, altnames, i);
674 #else
675 name = sk_GENERAL_NAME_value(altnames, i);
676 #endif
677 #if OPENSSL_VERSION_NUMBER < 0x10100000L
678 ns = (const char *)ASN1_STRING_data(name->d.ia5);
679 #else
680 ns = (const char *)ASN1_STRING_get0_data(name->d.ia5);
681 #endif
682 nslen = (size_t)ASN1_STRING_length(name->d.ia5);
683
684 if (name->type == GEN_DNS && ip == NULL &&
685 fetch_ssl_hname_match(host, strlen(host), ns, nslen))
686 return (1);
687 else if (name->type == GEN_IPADD && ip != NULL &&
688 fetch_ssl_ipaddr_match_bin(ip, ns, nslen))
689 return (1);
690 }
691 return (0);
692 }
693
694 /*
695 * Verify server certificate by CN.
696 */
697 static int
fetch_ssl_verify_cn(X509_NAME * subject,const char * host,struct addrinfo * ip)698 fetch_ssl_verify_cn(X509_NAME *subject, const char *host,
699 struct addrinfo *ip)
700 {
701 ASN1_STRING *namedata;
702 X509_NAME_ENTRY *nameentry;
703 int cnlen, lastpos, loc, ret;
704 unsigned char *cn;
705
706 ret = 0;
707 lastpos = -1;
708 loc = -1;
709 cn = NULL;
710 /* get most specific CN (last entry in list) and compare */
711 while ((lastpos = X509_NAME_get_index_by_NID(subject,
712 NID_commonName, lastpos)) != -1)
713 loc = lastpos;
714
715 if (loc > -1) {
716 nameentry = X509_NAME_get_entry(subject, loc);
717 namedata = X509_NAME_ENTRY_get_data(nameentry);
718 cnlen = ASN1_STRING_to_UTF8(&cn, namedata);
719 if (ip == NULL &&
720 fetch_ssl_hname_match(host, strlen(host), cn, cnlen))
721 ret = 1;
722 else if (ip != NULL && fetch_ssl_ipaddr_match(ip, cn, cnlen))
723 ret = 1;
724 OPENSSL_free(cn);
725 }
726 return (ret);
727 }
728
729 /*
730 * Verify that server certificate subjectAltName/CN matches
731 * hostname. First check, if there are alternative subject names. If yes,
732 * those have to match. Only if those don't exist it falls back to
733 * checking the subject's CN.
734 */
735 static int
fetch_ssl_verify_hname(X509 * cert,const char * host)736 fetch_ssl_verify_hname(X509 *cert, const char *host)
737 {
738 struct addrinfo *ip;
739 STACK_OF(GENERAL_NAME) *altnames;
740 X509_NAME *subject;
741 int ret;
742
743 ret = 0;
744 ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host));
745 altnames = X509_get_ext_d2i(cert, NID_subject_alt_name,
746 NULL, NULL);
747
748 if (altnames != NULL) {
749 ret = fetch_ssl_verify_altname(altnames, host, ip);
750 } else {
751 subject = X509_get_subject_name(cert);
752 if (subject != NULL)
753 ret = fetch_ssl_verify_cn(subject, host, ip);
754 }
755
756 if (ip != NULL)
757 freeaddrinfo(ip);
758 if (altnames != NULL)
759 GENERAL_NAMES_free(altnames);
760 return (ret);
761 }
762
763 /*
764 * Configure transport security layer based on environment.
765 */
766 static void
fetch_ssl_setup_transport_layer(SSL_CTX * ctx,int verbose)767 fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose)
768 {
769 long ssl_ctx_options;
770
771 ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET;
772 if (getenv("SSL_ALLOW_SSL3") == NULL)
773 ssl_ctx_options |= SSL_OP_NO_SSLv3;
774 if (getenv("SSL_NO_TLS1") != NULL)
775 ssl_ctx_options |= SSL_OP_NO_TLSv1;
776 if (getenv("SSL_NO_TLS1_1") != NULL)
777 ssl_ctx_options |= SSL_OP_NO_TLSv1_1;
778 if (getenv("SSL_NO_TLS1_2") != NULL)
779 ssl_ctx_options |= SSL_OP_NO_TLSv1_2;
780 if (verbose)
781 fetch_info("SSL options: %lx", ssl_ctx_options);
782 SSL_CTX_set_options(ctx, ssl_ctx_options);
783 }
784
785
786 /*
787 * Configure peer verification based on environment.
788 */
789 static int
fetch_ssl_setup_peer_verification(SSL_CTX * ctx,int verbose)790 fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose)
791 {
792 X509_LOOKUP *crl_lookup;
793 X509_STORE *crl_store;
794 const char *ca_cert_file, *ca_cert_path, *crl_file;
795
796 if (getenv("SSL_NO_VERIFY_PEER") == NULL) {
797 ca_cert_file = getenv("SSL_CA_CERT_FILE");
798 ca_cert_path = getenv("SSL_CA_CERT_PATH");
799 if (verbose) {
800 fetch_info("Peer verification enabled");
801 if (ca_cert_file != NULL)
802 fetch_info("Using CA cert file: %s",
803 ca_cert_file);
804 if (ca_cert_path != NULL)
805 fetch_info("Using CA cert path: %s",
806 ca_cert_path);
807 if (ca_cert_file == NULL && ca_cert_path == NULL)
808 fetch_info("Using OpenSSL default "
809 "CA cert file and path");
810 }
811 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER,
812 fetch_ssl_cb_verify_crt);
813 if (ca_cert_file != NULL || ca_cert_path != NULL)
814 SSL_CTX_load_verify_locations(ctx, ca_cert_file,
815 ca_cert_path);
816 else
817 SSL_CTX_set_default_verify_paths(ctx);
818 if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) {
819 if (verbose)
820 fetch_info("Using CRL file: %s", crl_file);
821 crl_store = SSL_CTX_get_cert_store(ctx);
822 crl_lookup = X509_STORE_add_lookup(crl_store,
823 X509_LOOKUP_file());
824 if (crl_lookup == NULL ||
825 !X509_load_crl_file(crl_lookup, crl_file,
826 X509_FILETYPE_PEM)) {
827 fprintf(stderr,
828 "Could not load CRL file %s\n",
829 crl_file);
830 return (0);
831 }
832 X509_STORE_set_flags(crl_store,
833 X509_V_FLAG_CRL_CHECK |
834 X509_V_FLAG_CRL_CHECK_ALL);
835 }
836 }
837 return (1);
838 }
839
840 /*
841 * Configure client certificate based on environment.
842 */
843 static int
fetch_ssl_setup_client_certificate(SSL_CTX * ctx,int verbose)844 fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose)
845 {
846 const char *client_cert_file, *client_key_file;
847
848 if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) {
849 client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ?
850 getenv("SSL_CLIENT_KEY_FILE") : client_cert_file;
851 if (verbose) {
852 fetch_info("Using client cert file: %s",
853 client_cert_file);
854 fetch_info("Using client key file: %s",
855 client_key_file);
856 }
857 if (SSL_CTX_use_certificate_chain_file(ctx,
858 client_cert_file) != 1) {
859 fprintf(stderr,
860 "Could not load client certificate %s\n",
861 client_cert_file);
862 return (0);
863 }
864 if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file,
865 SSL_FILETYPE_PEM) != 1) {
866 fprintf(stderr,
867 "Could not load client key %s\n",
868 client_key_file);
869 return (0);
870 }
871 }
872 return (1);
873 }
874
875 /*
876 * Callback for SSL certificate verification, this is called on server
877 * cert verification. It takes no decision, but informs the user in case
878 * verification failed.
879 */
880 int
fetch_ssl_cb_verify_crt(int verified,X509_STORE_CTX * ctx)881 fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx)
882 {
883 X509 *crt;
884 X509_NAME *name;
885 char *str;
886
887 str = NULL;
888 if (!verified) {
889 if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL &&
890 (name = X509_get_subject_name(crt)) != NULL)
891 str = X509_NAME_oneline(name, 0, 0);
892 fprintf(stderr, "Certificate verification failed for %s\n",
893 str != NULL ? str : "no relevant certificate");
894 OPENSSL_free(str);
895 }
896 return (verified);
897 }
898
899 #endif
900
901 /*
902 * Enable SSL on a connection.
903 */
904 int
fetch_ssl(conn_t * conn,const struct url * URL,int verbose)905 fetch_ssl(conn_t *conn, const struct url *URL, int verbose)
906 {
907 #ifdef WITH_SSL
908 int ret, ssl_err;
909 X509_NAME *name;
910 char *str;
911
912 /* Init the SSL library and context */
913 if (!SSL_library_init()){
914 fprintf(stderr, "SSL library init failed\n");
915 return (-1);
916 }
917
918 SSL_load_error_strings();
919
920 conn->ssl_meth = SSLv23_client_method();
921 conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
922 SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY);
923
924 fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose);
925 if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose))
926 return (-1);
927 if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose))
928 return (-1);
929
930 conn->ssl = SSL_new(conn->ssl_ctx);
931 if (conn->ssl == NULL) {
932 fprintf(stderr, "SSL context creation failed\n");
933 return (-1);
934 }
935 SSL_set_fd(conn->ssl, conn->sd);
936
937 #if OPENSSL_VERSION_NUMBER >= 0x0090806fL && !defined(OPENSSL_NO_TLSEXT)
938 if (!SSL_set_tlsext_host_name(conn->ssl,
939 __DECONST(struct url *, URL)->host)) {
940 fprintf(stderr,
941 "TLS server name indication extension failed for host %s\n",
942 URL->host);
943 return (-1);
944 }
945 #endif
946 while ((ret = SSL_connect(conn->ssl)) == -1) {
947 ssl_err = SSL_get_error(conn->ssl, ret);
948 if (ssl_err != SSL_ERROR_WANT_READ &&
949 ssl_err != SSL_ERROR_WANT_WRITE) {
950 ERR_print_errors_fp(stderr);
951 return (-1);
952 }
953 }
954 conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
955
956 if (conn->ssl_cert == NULL) {
957 fprintf(stderr, "No server SSL certificate\n");
958 return (-1);
959 }
960
961 if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) {
962 if (verbose)
963 fetch_info("Verify hostname");
964 if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) {
965 fprintf(stderr,
966 "SSL certificate subject doesn't match host %s\n",
967 URL->host);
968 return (-1);
969 }
970 }
971
972 if (verbose) {
973 fetch_info("%s connection established using %s",
974 SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl));
975 name = X509_get_subject_name(conn->ssl_cert);
976 str = X509_NAME_oneline(name, 0, 0);
977 fetch_info("Certificate subject: %s", str);
978 OPENSSL_free(str);
979 name = X509_get_issuer_name(conn->ssl_cert);
980 str = X509_NAME_oneline(name, 0, 0);
981 fetch_info("Certificate issuer: %s", str);
982 OPENSSL_free(str);
983 }
984
985 return (0);
986 #else
987 (void)conn;
988 (void)verbose;
989 fprintf(stderr, "SSL support disabled\n");
990 return (-1);
991 #endif
992 }
993
994 #define FETCH_READ_WAIT -2
995 #define FETCH_READ_ERROR -1
996 #define FETCH_READ_DONE 0
997
998 #ifdef WITH_SSL
999 static ssize_t
fetch_ssl_read(SSL * ssl,char * buf,size_t len)1000 fetch_ssl_read(SSL *ssl, char *buf, size_t len)
1001 {
1002 ssize_t rlen;
1003 int ssl_err;
1004
1005 rlen = SSL_read(ssl, buf, len);
1006 if (rlen < 0) {
1007 ssl_err = SSL_get_error(ssl, rlen);
1008 if (ssl_err == SSL_ERROR_WANT_READ ||
1009 ssl_err == SSL_ERROR_WANT_WRITE) {
1010 return (FETCH_READ_WAIT);
1011 } else {
1012 ERR_print_errors_fp(stderr);
1013 return (FETCH_READ_ERROR);
1014 }
1015 }
1016 return (rlen);
1017 }
1018 #endif
1019
1020 static ssize_t
fetch_socket_read(int sd,char * buf,size_t len)1021 fetch_socket_read(int sd, char *buf, size_t len)
1022 {
1023 ssize_t rlen;
1024
1025 rlen = read(sd, buf, len);
1026 if (rlen < 0) {
1027 if (errno == EAGAIN || (errno == EINTR && fetchRestartCalls))
1028 return (FETCH_READ_WAIT);
1029 else
1030 return (FETCH_READ_ERROR);
1031 }
1032 return (rlen);
1033 }
1034
1035 /*
1036 * Read a character from a connection w/ timeout
1037 */
1038 ssize_t
fetch_read(conn_t * conn,char * buf,size_t len)1039 fetch_read(conn_t *conn, char *buf, size_t len)
1040 {
1041 struct timeval now, timeout, delta;
1042 struct pollfd pfd;
1043 ssize_t rlen;
1044 int deltams;
1045
1046 if (fetchTimeout > 0) {
1047 gettimeofday(&timeout, NULL);
1048 timeout.tv_sec += fetchTimeout;
1049 }
1050
1051 deltams = INFTIM;
1052 memset(&pfd, 0, sizeof pfd);
1053 pfd.fd = conn->sd;
1054 pfd.events = POLLIN | POLLERR;
1055
1056 for (;;) {
1057 /*
1058 * The socket is non-blocking. Instead of the canonical
1059 * poll() -> read(), we do the following:
1060 *
1061 * 1) call read() or SSL_read().
1062 * 2) if we received some data, return it.
1063 * 3) if an error occurred, return -1.
1064 * 4) if read() or SSL_read() signaled EOF, return.
1065 * 5) if we did not receive any data but we're not at EOF,
1066 * call poll().
1067 *
1068 * In the SSL case, this is necessary because if we
1069 * receive a close notification, we have to call
1070 * SSL_read() one additional time after we've read
1071 * everything we received.
1072 *
1073 * In the non-SSL case, it may improve performance (very
1074 * slightly) when reading small amounts of data.
1075 */
1076 #ifdef WITH_SSL
1077 if (conn->ssl != NULL)
1078 rlen = fetch_ssl_read(conn->ssl, buf, len);
1079 else
1080 #endif
1081 rlen = fetch_socket_read(conn->sd, buf, len);
1082 if (rlen >= 0) {
1083 break;
1084 } else if (rlen == FETCH_READ_ERROR) {
1085 fetch_syserr();
1086 return (-1);
1087 }
1088 // assert(rlen == FETCH_READ_WAIT);
1089 if (fetchTimeout > 0) {
1090 gettimeofday(&now, NULL);
1091 if (!timercmp(&timeout, &now, >)) {
1092 errno = ETIMEDOUT;
1093 fetch_syserr();
1094 return (-1);
1095 }
1096 timersub(&timeout, &now, &delta);
1097 deltams = delta.tv_sec * 1000 +
1098 delta.tv_usec / 1000;;
1099 }
1100 errno = 0;
1101 pfd.revents = 0;
1102 if (poll(&pfd, 1, deltams) < 0) {
1103 if (errno == EINTR && fetchRestartCalls)
1104 continue;
1105 fetch_syserr();
1106 return (-1);
1107 }
1108 }
1109 return (rlen);
1110 }
1111
1112
1113 /*
1114 * Read a line of text from a connection w/ timeout
1115 */
1116 #define MIN_BUF_SIZE 1024
1117
1118 int
fetch_getln(conn_t * conn)1119 fetch_getln(conn_t *conn)
1120 {
1121 char *tmp;
1122 size_t tmpsize;
1123 ssize_t len;
1124 char c;
1125
1126 if (conn->buf == NULL) {
1127 if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) {
1128 errno = ENOMEM;
1129 return (-1);
1130 }
1131 conn->bufsize = MIN_BUF_SIZE;
1132 }
1133
1134 conn->buf[0] = '\0';
1135 conn->buflen = 0;
1136
1137 do {
1138 len = fetch_read(conn, &c, 1);
1139 if (len == -1)
1140 return (-1);
1141 if (len == 0)
1142 break;
1143 conn->buf[conn->buflen++] = c;
1144 if (conn->buflen == conn->bufsize) {
1145 tmp = conn->buf;
1146 tmpsize = conn->bufsize * 2 + 1;
1147 if ((tmp = realloc(tmp, tmpsize)) == NULL) {
1148 errno = ENOMEM;
1149 return (-1);
1150 }
1151 conn->buf = tmp;
1152 conn->bufsize = tmpsize;
1153 }
1154 } while (c != '\n');
1155
1156 conn->buf[conn->buflen] = '\0';
1157 DEBUGF("<<< %s", conn->buf);
1158 return (0);
1159 }
1160
1161
1162 /*
1163 * Write to a connection w/ timeout
1164 */
1165 ssize_t
fetch_write(conn_t * conn,const char * buf,size_t len)1166 fetch_write(conn_t *conn, const char *buf, size_t len)
1167 {
1168 struct iovec iov;
1169
1170 iov.iov_base = __DECONST(char *, buf);
1171 iov.iov_len = len;
1172 return fetch_writev(conn, &iov, 1);
1173 }
1174
1175 /*
1176 * Write a vector to a connection w/ timeout
1177 * Note: can modify the iovec.
1178 */
1179 ssize_t
fetch_writev(conn_t * conn,struct iovec * iov,int iovcnt)1180 fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt)
1181 {
1182 struct timeval now, timeout, delta;
1183 struct pollfd pfd;
1184 ssize_t wlen, total;
1185 int deltams;
1186
1187 memset(&pfd, 0, sizeof pfd);
1188 if (fetchTimeout) {
1189 pfd.fd = conn->sd;
1190 pfd.events = POLLOUT | POLLERR;
1191 gettimeofday(&timeout, NULL);
1192 timeout.tv_sec += fetchTimeout;
1193 }
1194
1195 total = 0;
1196 while (iovcnt > 0) {
1197 while (fetchTimeout && pfd.revents == 0) {
1198 gettimeofday(&now, NULL);
1199 if (!timercmp(&timeout, &now, >)) {
1200 errno = ETIMEDOUT;
1201 fetch_syserr();
1202 return (-1);
1203 }
1204 timersub(&timeout, &now, &delta);
1205 deltams = delta.tv_sec * 1000 +
1206 delta.tv_usec / 1000;
1207 errno = 0;
1208 pfd.revents = 0;
1209 if (poll(&pfd, 1, deltams) < 0) {
1210 /* POSIX compliance */
1211 if (errno == EAGAIN)
1212 continue;
1213 if (errno == EINTR && fetchRestartCalls)
1214 continue;
1215 return (-1);
1216 }
1217 }
1218 errno = 0;
1219 #ifdef WITH_SSL
1220 if (conn->ssl != NULL)
1221 wlen = SSL_write(conn->ssl,
1222 iov->iov_base, iov->iov_len);
1223 else
1224 #endif
1225 wlen = writev(conn->sd, iov, iovcnt);
1226 if (wlen == 0) {
1227 /* we consider a short write a failure */
1228 /* XXX perhaps we shouldn't in the SSL case */
1229 errno = EPIPE;
1230 fetch_syserr();
1231 return (-1);
1232 }
1233 if (wlen < 0) {
1234 if (errno == EINTR && fetchRestartCalls)
1235 continue;
1236 return (-1);
1237 }
1238 total += wlen;
1239 while (iovcnt > 0 && wlen >= (ssize_t)iov->iov_len) {
1240 wlen -= iov->iov_len;
1241 iov++;
1242 iovcnt--;
1243 }
1244 if (iovcnt > 0) {
1245 iov->iov_len -= wlen;
1246 iov->iov_base = __DECONST(char *, iov->iov_base) + wlen;
1247 }
1248 }
1249 return (total);
1250 }
1251
1252
1253 /*
1254 * Write a line of text to a connection w/ timeout
1255 */
1256 int
fetch_putln(conn_t * conn,const char * str,size_t len)1257 fetch_putln(conn_t *conn, const char *str, size_t len)
1258 {
1259 struct iovec iov[2];
1260 int ret;
1261
1262 DEBUGF(">>> %s\n", str);
1263 iov[0].iov_base = __DECONST(char *, str);
1264 iov[0].iov_len = len;
1265 iov[1].iov_base = __DECONST(char *, ENDL);
1266 iov[1].iov_len = sizeof(ENDL);
1267 if (len == 0)
1268 ret = fetch_writev(conn, &iov[1], 1);
1269 else
1270 ret = fetch_writev(conn, iov, 2);
1271 if (ret == -1)
1272 return (-1);
1273 return (0);
1274 }
1275
1276
1277 /*
1278 * Close connection
1279 */
1280 int
fetch_close(conn_t * conn)1281 fetch_close(conn_t *conn)
1282 {
1283 int ret;
1284
1285 if (--conn->ref > 0)
1286 return (0);
1287 #ifdef WITH_SSL
1288 if (conn->ssl) {
1289 SSL_shutdown(conn->ssl);
1290 SSL_set_connect_state(conn->ssl);
1291 SSL_free(conn->ssl);
1292 conn->ssl = NULL;
1293 }
1294 if (conn->ssl_ctx) {
1295 SSL_CTX_free(conn->ssl_ctx);
1296 conn->ssl_ctx = NULL;
1297 }
1298 if (conn->ssl_cert) {
1299 X509_free(conn->ssl_cert);
1300 conn->ssl_cert = NULL;
1301 }
1302 #endif
1303 ret = close(conn->sd);
1304 free(conn->buf);
1305 free(conn);
1306 return (ret);
1307 }
1308
1309
1310 /*** Directory-related utility functions *************************************/
1311
1312 int
fetch_add_entry(struct url_ent ** p,int * size,int * len,const char * name,struct url_stat * us)1313 fetch_add_entry(struct url_ent **p, int *size, int *len,
1314 const char *name, struct url_stat *us)
1315 {
1316 struct url_ent *tmp;
1317
1318 if (*p == NULL) {
1319 *size = 0;
1320 *len = 0;
1321 }
1322
1323 if (*len >= *size - 1) {
1324 tmp = reallocarray(*p, *size * 2 + 1, sizeof(**p));
1325 if (tmp == NULL) {
1326 errno = ENOMEM;
1327 fetch_syserr();
1328 return (-1);
1329 }
1330 *size = (*size * 2 + 1);
1331 *p = tmp;
1332 }
1333
1334 tmp = *p + *len;
1335 snprintf(tmp->name, PATH_MAX, "%s", name);
1336 memcpy(&tmp->stat, us, sizeof(*us));
1337
1338 (*len)++;
1339 (++tmp)->name[0] = 0;
1340
1341 return (0);
1342 }
1343
1344
1345 /*** Authentication-related utility functions ********************************/
1346
1347 static const char *
fetch_read_word(FILE * f)1348 fetch_read_word(FILE *f)
1349 {
1350 static char word[1024];
1351
1352 if (fscanf(f, " %1023s ", word) != 1)
1353 return (NULL);
1354 return (word);
1355 }
1356
1357 static int
fetch_netrc_open(void)1358 fetch_netrc_open(void)
1359 {
1360 struct passwd *pwd;
1361 char fn[PATH_MAX];
1362 const char *p;
1363 int fd, serrno;
1364
1365 if ((p = getenv("NETRC")) != NULL) {
1366 DEBUGF("NETRC=%s\n", p);
1367 if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) {
1368 fetch_info("$NETRC specifies a file name "
1369 "longer than PATH_MAX");
1370 return (-1);
1371 }
1372 } else {
1373 if ((p = getenv("HOME")) == NULL) {
1374 if ((pwd = getpwuid(getuid())) == NULL ||
1375 (p = pwd->pw_dir) == NULL)
1376 return (-1);
1377 }
1378 if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn))
1379 return (-1);
1380 }
1381
1382 if ((fd = open(fn, O_RDONLY)) < 0) {
1383 serrno = errno;
1384 DEBUGF("%s: %s\n", fn, strerror(serrno));
1385 errno = serrno;
1386 }
1387 return (fd);
1388 }
1389
1390 /*
1391 * Get authentication data for a URL from .netrc
1392 */
1393 int
fetch_netrc_auth(struct url * url)1394 fetch_netrc_auth(struct url *url)
1395 {
1396 const char *word;
1397 int serrno;
1398 FILE *f;
1399
1400 if (url->netrcfd < 0)
1401 url->netrcfd = fetch_netrc_open();
1402 if (url->netrcfd < 0)
1403 return (-1);
1404 if ((f = fdopen(url->netrcfd, "r")) == NULL) {
1405 serrno = errno;
1406 DEBUGF("fdopen(netrcfd): %s", strerror(errno));
1407 close(url->netrcfd);
1408 url->netrcfd = -1;
1409 errno = serrno;
1410 return (-1);
1411 }
1412 rewind(f);
1413 DEBUGF("searching netrc for %s\n", url->host);
1414 while ((word = fetch_read_word(f)) != NULL) {
1415 if (strcmp(word, "default") == 0) {
1416 DEBUGF("using default netrc settings\n");
1417 break;
1418 }
1419 if (strcmp(word, "machine") == 0 &&
1420 (word = fetch_read_word(f)) != NULL &&
1421 strcasecmp(word, url->host) == 0) {
1422 DEBUGF("using netrc settings for %s\n", word);
1423 break;
1424 }
1425 }
1426 if (word == NULL)
1427 goto ferr;
1428 while ((word = fetch_read_word(f)) != NULL) {
1429 if (strcmp(word, "login") == 0) {
1430 if ((word = fetch_read_word(f)) == NULL)
1431 goto ferr;
1432 if (snprintf(url->user, sizeof(url->user),
1433 "%s", word) > (int)sizeof(url->user)) {
1434 fetch_info("login name in .netrc is too long");
1435 url->user[0] = '\0';
1436 }
1437 } else if (strcmp(word, "password") == 0) {
1438 if ((word = fetch_read_word(f)) == NULL)
1439 goto ferr;
1440 if (snprintf(url->pwd, sizeof(url->pwd),
1441 "%s", word) > (int)sizeof(url->pwd)) {
1442 fetch_info("password in .netrc is too long");
1443 url->pwd[0] = '\0';
1444 }
1445 } else if (strcmp(word, "account") == 0) {
1446 if ((word = fetch_read_word(f)) == NULL)
1447 goto ferr;
1448 /* XXX not supported! */
1449 } else {
1450 break;
1451 }
1452 }
1453 fclose(f);
1454 url->netrcfd = -1;
1455 return (0);
1456 ferr:
1457 serrno = errno;
1458 fclose(f);
1459 url->netrcfd = -1;
1460 errno = serrno;
1461 return (-1);
1462 }
1463
1464 /*
1465 * The no_proxy environment variable specifies a set of domains for
1466 * which the proxy should not be consulted; the contents is a comma-,
1467 * or space-separated list of domain names. A single asterisk will
1468 * override all proxy variables and no transactions will be proxied
1469 * (for compatibility with lynx and curl, see the discussion at
1470 * <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>).
1471 */
1472 int
fetch_no_proxy_match(const char * host)1473 fetch_no_proxy_match(const char *host)
1474 {
1475 const char *no_proxy, *p, *q;
1476 size_t h_len, d_len;
1477
1478 if ((no_proxy = getenv("NO_PROXY")) == NULL &&
1479 (no_proxy = getenv("no_proxy")) == NULL)
1480 return (0);
1481
1482 /* asterisk matches any hostname */
1483 if (strcmp(no_proxy, "*") == 0)
1484 return (1);
1485
1486 h_len = strlen(host);
1487 p = no_proxy;
1488 do {
1489 /* position p at the beginning of a domain suffix */
1490 while (*p == ',' || isspace((unsigned char)*p))
1491 p++;
1492
1493 /* position q at the first separator character */
1494 for (q = p; *q; ++q)
1495 if (*q == ',' || isspace((unsigned char)*q))
1496 break;
1497
1498 d_len = q - p;
1499 if (d_len > 0 && h_len >= d_len &&
1500 strncasecmp(host + h_len - d_len,
1501 p, d_len) == 0) {
1502 /* domain name matches */
1503 return (1);
1504 }
1505
1506 p = q + 1;
1507 } while (*q);
1508
1509 return (0);
1510 }
1511