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From 45fa3f18adf57ef9d743038743d9c90573aeeb91 Mon Sep 17 00:00:00 2001
From: Dimitri John Ledkov <xnox@ubuntu.com>
Date: Tue, 19 May 2020 18:20:39 +0100
Subject: [PATCH] wget: implement TLS verification with
ENABLE_FEATURE_WGET_OPENSSL
When ENABLE_FEATURE_WGET_OPENSSL is enabled, correctly implement TLS
verification by default. And only ignore verification errors, if
--no-check-certificate was passed.
Also note, that previously OPENSSL implementation did not implement
TLS verification, nor printed any warning messages that verification
was not performed.
Bug-Ubuntu: https://bugs.launchpad.net/bugs/1879533
CVE-2018-1000500
Signed-off-by: Dimitri John Ledkov <xnox@ubuntu.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
---
networking/wget.c | 20 +++++++++++++++++---
1 file changed, 17 insertions(+), 3 deletions(-)
diff --git a/networking/wget.c b/networking/wget.c
index f2fc9e215..6a8c08324 100644
--- a/networking/wget.c
+++ b/networking/wget.c
@@ -91,6 +91,9 @@
//config: patches, but do want to waste bandwidth expaining how wrong
//config: it is, you will be ignored.
//config:
+//config: FEATURE_WGET_OPENSSL does implement TLS verification
+//config: using the certificates available to OpenSSL.
+//config:
//config:config FEATURE_WGET_OPENSSL
//config: bool "Try to connect to HTTPS using openssl"
//config: default y
@@ -115,6 +118,9 @@
//config: If openssl can't be executed, internal TLS code will be used
//config: (if you enabled it); if openssl can be executed but fails later,
//config: wget can't detect this, and download will fail.
+//config:
+//config: By default TLS verification is performed, unless
+//config: --no-check-certificate option is passed.
//applet:IF_WGET(APPLET(wget, BB_DIR_USR_BIN, BB_SUID_DROP))
@@ -124,8 +130,11 @@
//usage: IF_FEATURE_WGET_LONG_OPTIONS(
//usage: "[-c|--continue] [--spider] [-q|--quiet] [-O|--output-document FILE]\n"
//usage: " [-o|--output-file FILE] [--header 'header: value'] [-Y|--proxy on/off]\n"
+//usage: IF_FEATURE_WGET_OPENSSL(
+//usage: " [--no-check-certificate]\n"
+//usage: )
/* Since we ignore these opts, we don't show them in --help */
-/* //usage: " [--no-check-certificate] [--no-cache] [--passive-ftp] [-t TRIES]" */
+/* //usage: " [--no-cache] [--passive-ftp] [-t TRIES]" */
/* //usage: " [-nv] [-nc] [-nH] [-np]" */
//usage: " [-P DIR] [-S|--server-response] [-U|--user-agent AGENT]" IF_FEATURE_WGET_TIMEOUT(" [-T SEC]") " URL..."
//usage: )
@@ -137,7 +146,9 @@
//usage: "Retrieve files via HTTP or FTP\n"
//usage: IF_FEATURE_WGET_LONG_OPTIONS(
//usage: "\n --spider Only check URL existence: $? is 0 if exists"
-///////: "\n --no-check-certificate Don't validate the server's certificate"
+//usage: IF_FEATURE_WGET_OPENSSL(
+//usage: "\n --no-check-certificate Don't validate the server's certificate"
+//usage: )
//usage: )
//usage: "\n -c Continue retrieval of aborted transfer"
//usage: "\n -q Quiet"
@@ -662,7 +673,7 @@ static int spawn_https_helper_openssl(const char *host, unsigned port)
pid = xvfork();
if (pid == 0) {
/* Child */
- char *argv[8];
+ char *argv[9];
close(sp[0]);
xmove_fd(sp[1], 0);
@@ -689,6 +700,9 @@ static int spawn_https_helper_openssl(const char *host, unsigned port)
argv[5] = (char*)"-servername";
argv[6] = (char*)servername;
}
+ if (!(option_mask32 & WGET_OPT_NO_CHECK_CERT)) {
+ argv[7] = (char*)"-verify_return_error";
+ }
BB_EXECVP(argv[0], argv);
xmove_fd(3, 2);
--
2.28.0
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