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Fix a null-pointer dereference in establish_http_proxy_passthru()

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Prevents that the client crashes if the peer does not specify
the 'realm' and/or 'nonce' values. These pointers are
dereferenced in DigestCalcHA1() and DigestCalcResponse();
hence, if not set, a null-pointer dereference would occur.

Signed-off-by: Guido Vranken <guidovranken@gmail.com>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <1497574736-2092-1-git-send-email-gv@guidovranken.nl>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg14844.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
This commit is contained in:
Guido Vranken 2017-06-16 02:58:56 +02:00 committed by Gert Doering
parent e6bf7e033d
commit 14865773ad
1 changed files with 7 additions and 0 deletions
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7
src/openvpn/proxy.c
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@ -875,6 +875,13 @@ establish_http_proxy_passthru(struct http_proxy_info *p,
const char *algor = get_pa_var("algorithm", pa, &gc);
const char *opaque = get_pa_var("opaque", pa, &gc);
if ( !realm || !nonce )
{
msg(D_LINK_ERRORS, "HTTP proxy: digest auth failed, malformed response "
"from server: realm= or nonce= missing" );
goto error;
}
/* generate a client nonce */
ASSERT(rand_bytes(cnonce_raw, sizeof(cnonce_raw)));
cnonce = make_base64_string2(cnonce_raw, sizeof(cnonce_raw), &gc);