From 5019c780958c3a8dbe64123aa90e6eaff1b84cfa Mon Sep 17 00:00:00 2001 From: Daniel Stenberg Date: Mon, 3 Mar 2014 11:46:36 +0100 Subject: [PATCH] Curl_cert_hostcheck: reject IP address wildcard matches There are server certificates used with IP address in the CN field, but we MUST not allow wild cart certs for hostnames given as IP addresses only. Therefore we must make Curl_cert_hostcheck() fail such attempts. Bug: http://curl.haxx.se/docs/adv_20140326B.html Reported-by: Richard Moore --- lib/hostcheck.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/lib/hostcheck.c b/lib/hostcheck.c index 24ddd89607..d144f319ad 100644 --- a/lib/hostcheck.c +++ b/lib/hostcheck.c @@ -28,6 +28,7 @@ #include "hostcheck.h" #include "rawstr.h" +#include "inet_pton.h" /* * Match a hostname against a wildcard pattern. @@ -43,11 +44,23 @@ static int hostmatch(const char *hostname, const char *pattern) const char *pattern_label_end, *pattern_wildcard, *hostname_label_end; int wildcard_enabled; size_t prefixlen, suffixlen; + struct in_addr ignored; +#ifdef ENABLE_IPV6 + struct sockaddr_in6 si6; +#endif pattern_wildcard = strchr(pattern, '*'); if(pattern_wildcard == NULL) return Curl_raw_equal(pattern, hostname) ? CURL_HOST_MATCH : CURL_HOST_NOMATCH; + /* detect IP address as hostname and fail the match if so */ + if(Curl_inet_pton(AF_INET, hostname, &ignored) > 0) + return CURL_HOST_NOMATCH; +#ifdef ENABLE_IPV6 + else if(Curl_inet_pton(AF_INET6, hostname, &si6.sin6_addr) > 0) + return CURL_HOST_NOMATCH; +#endif + /* We require at least 2 dots in pattern to avoid too wide wildcard match. */ wildcard_enabled = 1;