libfetch: merge some features from FreeBSD:
- Supports HTTP/1.1 308 redirect. - SSLv[23] HTTPS connections are forbidden by default. - TLS client certificate validation thru OpenSSL. - Fixes for user/password encoding, misc.
This commit is contained in:
Juan RP
@ -1,7 +1,9 @@
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/* $FreeBSD: rev 288217 $ */
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/* $NetBSD: common.c,v 1.29 2014/01/08 20:25:34 joerg Exp $ */
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/*-
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* Copyright (c) 1998-2004 Dag-Erling Co<EFBFBD>dan Sm<EFBFBD>rgrav
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* Copyright (c) 1998-2014 Dag-Erling Smorgrav
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* Copyright (c) 2008, 2010 Joerg Sonnenberger <joerg@NetBSD.org>
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* Copyright (c) 2013 Michael Gmelin <freebsd@grem.de>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -26,8 +28,6 @@
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* $FreeBSD: common.c,v 1.53 2007/12/19 00:26:36 des Exp $
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*/
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#include "compat.h"
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@ -58,6 +58,10 @@
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#include <signal.h>
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#endif
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#ifdef WITH_SSL
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#include <openssl/x509v3.h>
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#endif
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#include <pthread.h>
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#include "fetch.h"
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@ -438,6 +442,495 @@ fetch_cache_put(conn_t *conn, int (*closecb)(conn_t *))
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pthread_mutex_unlock(&cache_mtx);
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}
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#ifdef WITH_SSL
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/*
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* Find the first occurrence of find in s, where the search is limited to the
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* first slen characters of s.
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*/
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static char *
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strnstr(const char *s, const char *find, size_t slen)
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{
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char c, sc;
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size_t len;
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if ((c = *find++) != '\0') {
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len = strlen(find);
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do {
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do {
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if (slen-- < 1 || (sc = *s++) == '\0')
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return (NULL);
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} while (sc != c);
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if (len > slen)
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return (NULL);
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} while (strncmp(s, find, len) != 0);
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s--;
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}
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return ((char *)__UNCONST(s));
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}
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/*
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* Convert characters A-Z to lowercase (intentionally avoid any locale
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* specific conversions).
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*/
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static char
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fetch_ssl_tolower(char in)
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{
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if (in >= 'A' && in <= 'Z')
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return (in + 32);
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else
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return (in);
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}
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/*
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* isalpha implementation that intentionally avoids any locale specific
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* conversions.
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*/
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static int
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fetch_ssl_isalpha(char in)
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{
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return ((in >= 'A' && in <= 'Z') || (in >= 'a' && in <= 'z'));
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}
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/*
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* Check if passed hostnames a and b are equal.
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*/
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static int
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fetch_ssl_hname_equal(const char *a, size_t alen, const char *b,
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size_t blen)
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{
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size_t i;
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if (alen != blen)
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return (0);
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for (i = 0; i < alen; ++i) {
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if (fetch_ssl_tolower(a[i]) != fetch_ssl_tolower(b[i]))
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return (0);
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}
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return (1);
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}
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/*
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* Check if domain label is traditional, meaning that only A-Z, a-z, 0-9
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* and '-' (hyphen) are allowed. Hyphens have to be surrounded by alpha-
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* numeric characters. Double hyphens (like they're found in IDN a-labels
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* 'xn--') are not allowed. Empty labels are invalid.
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*/
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static int
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fetch_ssl_is_trad_domain_label(const char *l, size_t len, int wcok)
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{
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size_t i;
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if (!len || l[0] == '-' || l[len-1] == '-')
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return (0);
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for (i = 0; i < len; ++i) {
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if (!isdigit(l[i]) &&
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!fetch_ssl_isalpha(l[i]) &&
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!(l[i] == '*' && wcok) &&
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!(l[i] == '-' && l[i - 1] != '-'))
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return (0);
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}
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return (1);
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}
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/*
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* Check if host name consists only of numbers. This might indicate an IP
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* address, which is not a good idea for CN wildcard comparison.
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*/
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static int
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fetch_ssl_hname_is_only_numbers(const char *hostname, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i) {
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if (!((hostname[i] >= '0' && hostname[i] <= '9') ||
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hostname[i] == '.'))
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return (0);
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}
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return (1);
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}
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/*
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* Check if the host name h passed matches the pattern passed in m which
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* is usually part of subjectAltName or CN of a certificate presented to
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* the client. This includes wildcard matching. The algorithm is based on
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* RFC6125, sections 6.4.3 and 7.2, which clarifies RFC2818 and RFC3280.
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*/
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static int
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fetch_ssl_hname_match(const char *h, size_t hlen, const char *m,
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size_t mlen)
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{
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int delta, hdotidx, mdot1idx, wcidx;
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const char *hdot, *mdot1, *mdot2;
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const char *wc; /* wildcard */
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if (!(h && *h && m && *m))
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return (0);
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if ((wc = strnstr(m, "*", mlen)) == NULL)
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return (fetch_ssl_hname_equal(h, hlen, m, mlen));
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wcidx = wc - m;
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/* hostname should not be just dots and numbers */
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if (fetch_ssl_hname_is_only_numbers(h, hlen))
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return (0);
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/* only one wildcard allowed in pattern */
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if (strnstr(wc + 1, "*", mlen - wcidx - 1) != NULL)
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return (0);
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/*
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* there must be at least two more domain labels and
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* wildcard has to be in the leftmost label (RFC6125)
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*/
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mdot1 = strnstr(m, ".", mlen);
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if (mdot1 == NULL || mdot1 < wc || (mlen - (mdot1 - m)) < 4)
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return (0);
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mdot1idx = mdot1 - m;
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mdot2 = strnstr(mdot1 + 1, ".", mlen - mdot1idx - 1);
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if (mdot2 == NULL || (mlen - (mdot2 - m)) < 2)
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return (0);
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/* hostname must contain a dot and not be the 1st char */
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hdot = strnstr(h, ".", hlen);
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if (hdot == NULL || hdot == h)
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return (0);
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hdotidx = hdot - h;
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/*
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* host part of hostname must be at least as long as
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* pattern it's supposed to match
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*/
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if (hdotidx < mdot1idx)
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return (0);
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/*
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* don't allow wildcards in non-traditional domain names
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* (IDN, A-label, U-label...)
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*/
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if (!fetch_ssl_is_trad_domain_label(h, hdotidx, 0) ||
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!fetch_ssl_is_trad_domain_label(m, mdot1idx, 1))
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return (0);
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/* match domain part (part after first dot) */
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if (!fetch_ssl_hname_equal(hdot, hlen - hdotidx, mdot1,
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mlen - mdot1idx))
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return (0);
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/* match part left of wildcard */
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if (!fetch_ssl_hname_equal(h, wcidx, m, wcidx))
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return (0);
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/* match part right of wildcard */
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delta = mdot1idx - wcidx - 1;
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if (!fetch_ssl_hname_equal(hdot - delta, delta,
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mdot1 - delta, delta))
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return (0);
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/* all tests succeded, it's a match */
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return (1);
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}
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/*
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* Get numeric host address info - returns NULL if host was not an IP
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* address. The caller is responsible for deallocation using
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* freeaddrinfo(3).
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*/
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static struct addrinfo *
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fetch_ssl_get_numeric_addrinfo(const char *hostname, size_t len)
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{
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struct addrinfo hints, *res;
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char *host;
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host = (char *)malloc(len + 1);
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memcpy(host, hostname, len);
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host[len] = '\0';
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = PF_UNSPEC;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = 0;
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hints.ai_flags = AI_NUMERICHOST;
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/* port is not relevant for this purpose */
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if (getaddrinfo(host, "443", &hints, &res) != 0)
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return NULL;
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free(host);
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return res;
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}
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/*
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* Compare ip address in addrinfo with address passes.
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*/
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static int
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fetch_ssl_ipaddr_match_bin(const struct addrinfo *lhost, const char *rhost,
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size_t rhostlen)
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{
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const void *left;
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if (lhost->ai_family == AF_INET && rhostlen == 4) {
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left = (void *)&((struct sockaddr_in*)(void *)
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lhost->ai_addr)->sin_addr.s_addr;
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#ifdef INET6
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} else if (lhost->ai_family == AF_INET6 && rhostlen == 16) {
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left = (void *)&((struct sockaddr_in6 *)(void *)
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lhost->ai_addr)->sin6_addr;
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#endif
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} else
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return (0);
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return (!memcmp(left, (const void *)rhost, rhostlen) ? 1 : 0);
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}
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/*
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* Compare ip address in addrinfo with host passed. If host is not an IP
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* address, comparison will fail.
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*/
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static int
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fetch_ssl_ipaddr_match(const struct addrinfo *laddr, const char *r,
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size_t rlen)
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{
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struct addrinfo *raddr;
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int ret;
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char *rip;
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ret = 0;
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if ((raddr = fetch_ssl_get_numeric_addrinfo(r, rlen)) == NULL)
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return 0; /* not a numeric host */
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if (laddr->ai_family == raddr->ai_family) {
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if (laddr->ai_family == AF_INET) {
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rip = (char *)&((struct sockaddr_in *)(void *)
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raddr->ai_addr)->sin_addr.s_addr;
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ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 4);
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#ifdef INET6
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} else if (laddr->ai_family == AF_INET6) {
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rip = (char *)&((struct sockaddr_in6 *)(void *)
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raddr->ai_addr)->sin6_addr;
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ret = fetch_ssl_ipaddr_match_bin(laddr, rip, 16);
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#endif
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}
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}
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freeaddrinfo(raddr);
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return (ret);
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}
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/*
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* Verify server certificate by subjectAltName.
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*/
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static int
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fetch_ssl_verify_altname(STACK_OF(GENERAL_NAME) *altnames,
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const char *host, struct addrinfo *ip)
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{
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const GENERAL_NAME *name;
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size_t nslen;
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int i;
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const char *ns;
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for (i = 0; i < sk_GENERAL_NAME_num(altnames); ++i) {
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name = sk_GENERAL_NAME_value(altnames, i);
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ns = (const char *)ASN1_STRING_data(name->d.ia5);
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nslen = (size_t)ASN1_STRING_length(name->d.ia5);
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if (name->type == GEN_DNS && ip == NULL &&
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fetch_ssl_hname_match(host, strlen(host), ns, nslen))
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return (1);
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else if (name->type == GEN_IPADD && ip != NULL &&
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fetch_ssl_ipaddr_match_bin(ip, ns, nslen))
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return (1);
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}
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return (0);
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}
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/*
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* Verify server certificate by CN.
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*/
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static int
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fetch_ssl_verify_cn(X509_NAME *subject, const char *host,
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struct addrinfo *ip)
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{
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ASN1_STRING *namedata;
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X509_NAME_ENTRY *nameentry;
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int cnlen, lastpos, loc, ret;
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unsigned char *cn;
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ret = 0;
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lastpos = -1;
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loc = -1;
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cn = NULL;
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/* get most specific CN (last entry in list) and compare */
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while ((lastpos = X509_NAME_get_index_by_NID(subject,
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NID_commonName, lastpos)) != -1)
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loc = lastpos;
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if (loc > -1) {
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nameentry = X509_NAME_get_entry(subject, loc);
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namedata = X509_NAME_ENTRY_get_data(nameentry);
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cnlen = ASN1_STRING_to_UTF8(&cn, namedata);
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if (ip == NULL &&
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fetch_ssl_hname_match(host, strlen(host), (const char *)cn, cnlen))
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ret = 1;
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else if (ip != NULL && fetch_ssl_ipaddr_match(ip, (const char *)cn, cnlen))
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ret = 1;
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OPENSSL_free(cn);
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}
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return (ret);
|
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}
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/*
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* Verify that server certificate subjectAltName/CN matches
|
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* hostname. First check, if there are alternative subject names. If yes,
|
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* those have to match. Only if those don't exist it falls back to
|
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* checking the subject's CN.
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*/
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static int
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fetch_ssl_verify_hname(X509 *cert, const char *host)
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{
|
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struct addrinfo *ip;
|
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STACK_OF(GENERAL_NAME) *altnames;
|
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X509_NAME *subject;
|
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int ret;
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ret = 0;
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ip = fetch_ssl_get_numeric_addrinfo(host, strlen(host));
|
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altnames = X509_get_ext_d2i(cert, NID_subject_alt_name,
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NULL, NULL);
|
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|
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if (altnames != NULL) {
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ret = fetch_ssl_verify_altname(altnames, host, ip);
|
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} else {
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subject = X509_get_subject_name(cert);
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if (subject != NULL)
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ret = fetch_ssl_verify_cn(subject, host, ip);
|
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}
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|
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if (ip != NULL)
|
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freeaddrinfo(ip);
|
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if (altnames != NULL)
|
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GENERAL_NAMES_free(altnames);
|
||||
return (ret);
|
||||
}
|
||||
|
||||
/*
|
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* Configure transport security layer based on environment.
|
||||
*/
|
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static void
|
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fetch_ssl_setup_transport_layer(SSL_CTX *ctx, int verbose)
|
||||
{
|
||||
long ssl_ctx_options;
|
||||
|
||||
ssl_ctx_options = SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_TICKET;
|
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if (getenv("SSL_ALLOW_SSL3") == NULL)
|
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ssl_ctx_options |= SSL_OP_NO_SSLv3;
|
||||
if (getenv("SSL_NO_TLS1") != NULL)
|
||||
ssl_ctx_options |= SSL_OP_NO_TLSv1;
|
||||
if (getenv("SSL_NO_TLS1_1") != NULL)
|
||||
ssl_ctx_options |= SSL_OP_NO_TLSv1_1;
|
||||
if (getenv("SSL_NO_TLS1_2") != NULL)
|
||||
ssl_ctx_options |= SSL_OP_NO_TLSv1_2;
|
||||
if (verbose)
|
||||
fetch_info("SSL options: %lx", ssl_ctx_options);
|
||||
SSL_CTX_set_options(ctx, ssl_ctx_options);
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Configure peer verification based on environment.
|
||||
*/
|
||||
static int
|
||||
fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose)
|
||||
{
|
||||
X509_LOOKUP *crl_lookup;
|
||||
X509_STORE *crl_store;
|
||||
const char *ca_cert_file, *ca_cert_path, *crl_file;
|
||||
|
||||
if (getenv("SSL_NO_VERIFY_PEER") == NULL) {
|
||||
ca_cert_file = getenv("SSL_CA_CERT_FILE") != NULL ?
|
||||
getenv("SSL_CA_CERT_FILE") : "/etc/ssl/cert.pem";
|
||||
ca_cert_path = getenv("SSL_CA_CERT_PATH");
|
||||
if (verbose) {
|
||||
fetch_info("Peer verification enabled");
|
||||
if (ca_cert_file != NULL)
|
||||
fetch_info("Using CA cert file: %s",
|
||||
ca_cert_file);
|
||||
if (ca_cert_path != NULL)
|
||||
fetch_info("Using CA cert path: %s",
|
||||
ca_cert_path);
|
||||
}
|
||||
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER,
|
||||
fetch_ssl_cb_verify_crt);
|
||||
SSL_CTX_load_verify_locations(ctx, ca_cert_file,
|
||||
ca_cert_path);
|
||||
if ((crl_file = getenv("SSL_CRL_FILE")) != NULL) {
|
||||
if (verbose)
|
||||
fetch_info("Using CRL file: %s", crl_file);
|
||||
|
||||
crl_store = SSL_CTX_get_cert_store(ctx);
|
||||
crl_lookup = X509_STORE_add_lookup(crl_store,
|
||||
X509_LOOKUP_file());
|
||||
if (crl_lookup == NULL ||
|
||||
!X509_load_crl_file(crl_lookup, crl_file,
|
||||
X509_FILETYPE_PEM)) {
|
||||
fprintf(stderr,
|
||||
"Could not load CRL file %s\n",
|
||||
crl_file);
|
||||
return (0);
|
||||
}
|
||||
X509_STORE_set_flags(crl_store,
|
||||
X509_V_FLAG_CRL_CHECK |
|
||||
X509_V_FLAG_CRL_CHECK_ALL);
|
||||
}
|
||||
}
|
||||
return (1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Configure client certificate based on environment.
|
||||
*/
|
||||
static int
|
||||
fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose)
|
||||
{
|
||||
const char *client_cert_file, *client_key_file;
|
||||
|
||||
if ((client_cert_file = getenv("SSL_CLIENT_CERT_FILE")) != NULL) {
|
||||
client_key_file = getenv("SSL_CLIENT_KEY_FILE") != NULL ?
|
||||
getenv("SSL_CLIENT_KEY_FILE") : client_cert_file;
|
||||
if (verbose) {
|
||||
fetch_info("Using client cert file: %s",
|
||||
client_cert_file);
|
||||
fetch_info("Using client key file: %s",
|
||||
client_key_file);
|
||||
}
|
||||
if (SSL_CTX_use_certificate_chain_file(ctx,
|
||||
client_cert_file) != 1) {
|
||||
fprintf(stderr,
|
||||
"Could not load client certificate %s\n",
|
||||
client_cert_file);
|
||||
return (0);
|
||||
}
|
||||
if (SSL_CTX_use_PrivateKey_file(ctx, client_key_file,
|
||||
SSL_FILETYPE_PEM) != 1) {
|
||||
fprintf(stderr,
|
||||
"Could not load client key %s\n",
|
||||
client_key_file);
|
||||
return (0);
|
||||
}
|
||||
}
|
||||
return (1);
|
||||
}
|
||||
|
||||
/*
|
||||
* Callback for SSL certificate verification, this is called on server
|
||||
* cert verification. It takes no decision, but informs the user in case
|
||||
* verification failed.
|
||||
*/
|
||||
int
|
||||
fetch_ssl_cb_verify_crt(int verified, X509_STORE_CTX *ctx)
|
||||
{
|
||||
X509 *crt;
|
||||
X509_NAME *name;
|
||||
char *str;
|
||||
|
||||
str = NULL;
|
||||
if (!verified) {
|
||||
if ((crt = X509_STORE_CTX_get_current_cert(ctx)) != NULL &&
|
||||
(name = X509_get_subject_name(crt)) != NULL)
|
||||
str = X509_NAME_oneline(name, 0, 0);
|
||||
fprintf(stderr, "Certificate verification failed for %s\n",
|
||||
str != NULL ? str : "no relevant certificate");
|
||||
OPENSSL_free(str);
|
||||
}
|
||||
return (verified);
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Enable SSL on a connection.
|
||||
*/
|
||||
@ -447,6 +940,8 @@ fetch_ssl(conn_t *conn, const struct url *URL, int verbose)
|
||||
|
||||
#ifdef WITH_SSL
|
||||
int ret;
|
||||
X509_NAME *name;
|
||||
char *str;
|
||||
|
||||
/* Init the SSL library and context */
|
||||
if (!SSL_library_init()){
|
||||
@ -460,8 +955,14 @@ fetch_ssl(conn_t *conn, const struct url *URL, int verbose)
|
||||
conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
|
||||
SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY);
|
||||
|
||||
fetch_ssl_setup_transport_layer(conn->ssl_ctx, verbose);
|
||||
if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose))
|
||||
return (-1);
|
||||
if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose))
|
||||
return (-1);
|
||||
|
||||
conn->ssl = SSL_new(conn->ssl_ctx);
|
||||
if (conn->ssl == NULL){
|
||||
if (conn->ssl == NULL) {
|
||||
fprintf(stderr, "SSL context creation failed\n");
|
||||
return (-1);
|
||||
}
|
||||
@ -483,21 +984,36 @@ fetch_ssl(conn_t *conn, const struct url *URL, int verbose)
|
||||
return (-1);
|
||||
}
|
||||
|
||||
if (verbose) {
|
||||
X509_NAME *name;
|
||||
char *str;
|
||||
conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
|
||||
|
||||
fprintf(stderr, "SSL connection established using %s\n",
|
||||
SSL_get_cipher(conn->ssl));
|
||||
if (conn->ssl_cert == NULL) {
|
||||
fprintf(stderr, "No server SSL certificate\n");
|
||||
return (-1);
|
||||
}
|
||||
|
||||
if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) {
|
||||
if (verbose)
|
||||
fetch_info("Verify hostname");
|
||||
if (!fetch_ssl_verify_hname(conn->ssl_cert, URL->host)) {
|
||||
fprintf(stderr,
|
||||
"SSL certificate subject doesn't match host %s\n",
|
||||
URL->host);
|
||||
return (-1);
|
||||
}
|
||||
}
|
||||
|
||||
if (verbose) {
|
||||
fetch_info("%s connection established using %s",
|
||||
SSL_get_version(conn->ssl), SSL_get_cipher(conn->ssl));
|
||||
conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
|
||||
name = X509_get_subject_name(conn->ssl_cert);
|
||||
str = X509_NAME_oneline(name, 0, 0);
|
||||
printf("Certificate subject: %s\n", str);
|
||||
free(str);
|
||||
fetch_info("Certificate subject: %s", str);
|
||||
OPENSSL_free(str);
|
||||
name = X509_get_issuer_name(conn->ssl_cert);
|
||||
str = X509_NAME_oneline(name, 0, 0);
|
||||
printf("Certificate issuer: %s\n", str);
|
||||
free(str);
|
||||
fetch_info("Certificate issuer: %s", str);
|
||||
OPENSSL_free(str);
|
||||
}
|
||||
|
||||
return (0);
|
||||
@ -744,7 +1260,17 @@ fetch_close(conn_t *conn)
|
||||
#ifdef WITH_SSL
|
||||
if (conn->ssl) {
|
||||
SSL_shutdown(conn->ssl);
|
||||
SSL_set_connect_state(conn->ssl);
|
||||
SSL_free(conn->ssl);
|
||||
conn->ssl = NULL;
|
||||
}
|
||||
if (conn->ssl_ctx) {
|
||||
SSL_CTX_free(conn->ssl_ctx);
|
||||
conn->ssl_ctx = NULL;
|
||||
}
|
||||
if (conn->ssl_cert) {
|
||||
X509_free(conn->ssl_cert);
|
||||
conn->ssl_cert = NULL;
|
||||
}
|
||||
#endif
|
||||
ret = close(conn->sd);
|
||||
|
||||
Reference in New Issue
Block a user