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Do not send IP addresses in SNI TLS extension

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This commit is contained in:
Charalampos Stratakis 2018-03-13 17:09:14 +01:00
parent 8da28a1295
commit c88659f91b
2 changed files with 78 additions and 1 deletions
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68
00298-do-not-send-IP-in-SNI-TLS-extension.patch Normal file
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@ -0,0 +1,68 @@
diff --git a/Misc/NEWS.d/next/Library/2017-12-20-09-25-10.bpo-32185.IL0cMt.rst b/Misc/NEWS.d/next/Library/2017-12-20-09-25-10.bpo-32185.IL0cMt.rst
new file mode 100644
index 000000000000..bfb2533b5dcf
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2017-12-20-09-25-10.bpo-32185.IL0cMt.rst
@@ -0,0 +1,2 @@
+The SSL module no longer sends IP addresses in SNI TLS extension on
+platforms with OpenSSL 1.0.2+ or inet_pton.
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index f70af266731a..b191b3a8687a 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -52,6 +52,11 @@
#include <sys/poll.h>
#endif
+#ifndef MS_WINDOWS
+/* inet_pton */
+#include <arpa/inet.h>
+#endif
+
/* Don't warn about deprecated functions */
#ifdef __GNUC__
#pragma GCC diagnostic ignored "-Wdeprecated-declarations"
@@ -575,8 +580,41 @@ newPySSLSocket(PySSLContext *sslctx, PySocketSockObject *sock,
SSL_set_mode(self->ssl, mode);
#if HAVE_SNI
- if (server_hostname != NULL)
- SSL_set_tlsext_host_name(self->ssl, server_hostname);
+ if (server_hostname != NULL) {
+/* Don't send SNI for IP addresses. We cannot simply use inet_aton() and
+ * inet_pton() here. inet_aton() may be linked weakly and inet_pton() isn't
+ * available on all platforms. Use OpenSSL's IP address parser. It's
+ * available since 1.0.2 and LibreSSL since at least 2.3.0. */
+ int send_sni = 1;
+#if OPENSSL_VERSION_NUMBER >= 0x10200000L
+ ASN1_OCTET_STRING *ip = a2i_IPADDRESS(server_hostname);
+ if (ip == NULL) {
+ send_sni = 1;
+ ERR_clear_error();
+ } else {
+ send_sni = 0;
+ ASN1_OCTET_STRING_free(ip);
+ }
+#elif defined(HAVE_INET_PTON)
+#ifdef ENABLE_IPV6
+ char packed[Py_MAX(sizeof(struct in_addr), sizeof(struct in6_addr))];
+#else
+ char packed[sizeof(struct in_addr)];
+#endif /* ENABLE_IPV6 */
+ if (inet_pton(AF_INET, server_hostname, packed)) {
+ send_sni = 0;
+#ifdef ENABLE_IPV6
+ } else if(inet_pton(AF_INET6, server_hostname, packed)) {
+ send_sni = 0;
+#endif /* ENABLE_IPV6 */
+ } else {
+ send_sni = 1;
+ }
+#endif /* HAVE_INET_PTON */
+ if (send_sni) {
+ SSL_set_tlsext_host_name(self->ssl, server_hostname);
+ }
+ }
#endif
/* If the socket is in non-blocking mode or timeout mode, set the BIO

11
python2.spec
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@ -112,7 +112,7 @@ Summary: An interpreted, interactive, object-oriented programming language
Name: %{python}
# Remember to also rebase python-docs when changing this:
Version: 2.7.14
Release: 8%{?dist}
Release: 9%{?dist}
License: Python
Group: Development/Languages
Requires: %{python}-libs%{?_isa} = %{version}-%{release}
@ -761,6 +761,11 @@ Patch287: 00287-fix-thread-hanging-on-inaccessible-nfs-server.patch
# Fixed upstream: https://github.com/python/cpython/pull/3581
Patch297: 00297-fix-int-in-bool-context-warnings.patch
# 00298 #
# The SSL module no longer sends IP addresses in SNI TLS extension on
# platforms with OpenSSL 1.0.2+ or inet_pton.
# Fixed upstream: https://bugs.python.org/issue32185
Patch298: 00298-do-not-send-IP-in-SNI-TLS-extension.patch
# (New patches go here ^^^)
#
@ -1086,6 +1091,7 @@ mv Modules/cryptmodule.c Modules/_cryptmodule.c
%patch285 -p1
%patch287 -p1
%patch297 -p1
%patch298 -p1
%if 0%{?_module_build}
@ -1977,6 +1983,9 @@ rm -fr %{buildroot}
# ======================================================
%changelog
* Tue Mar 13 2018 Charalampos Stratakis <cstratak@redhat.com> - 2.7.14-9
- Do not send IP addresses in SNI TLS extension
* Mon Feb 26 2018 Petr Viktorin <pviktori@redhat.com> - 2.7.14-8
- Fix -Wint-in-bool-context warnings