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From b914607db0576e1e0a4f49c58b12058f713b5b75 Mon Sep 17 00:00:00 2001
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From: Jeffrey Cody <jcody@redhat.com>
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Date: Wed, 26 Sep 2018 04:08:14 +0100
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Subject: [PATCH 4/4] curl: Make sslverify=off disable host as well as peer
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verification.
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RH-Author: Jeffrey Cody <jcody@redhat.com>
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Message-id: <543d2f667af465dd809329fcba5175bc974d58d4.1537933576.git.jcody@redhat.com>
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Patchwork-id: 82293
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O-Subject: [RHEL8/rhel qemu-kvm PATCH 1/1] curl: Make sslverify=off disable host as well as peer verification.
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Bugzilla: 1575925
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RH-Acked-by: Richard Jones <rjones@redhat.com>
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RH-Acked-by: John Snow <jsnow@redhat.com>
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RH-Acked-by: Max Reitz <mreitz@redhat.com>
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From: "Richard W.M. Jones" <rjones@redhat.com>
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The sslverify setting is supposed to turn off all TLS certificate
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checks in libcurl. However because of the way we use it, it only
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turns off peer certificate authenticity checks
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(CURLOPT_SSL_VERIFYPEER). This patch makes it also turn off the check
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that the server name in the certificate is the same as the server
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you're connecting to (CURLOPT_SSL_VERIFYHOST).
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We can use Google's server at 8.8.8.8 which happens to have a bad TLS
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certificate to demonstrate this:
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$ ./qemu-img create -q -f qcow2 -b 'json: { "file.sslverify": "off", "file.driver": "https", "file.url": "https://8.8.8.8/foo" }' /var/tmp/file.qcow2
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qemu-img: /var/tmp/file.qcow2: CURL: Error opening file: SSL: no alternative certificate subject name matches target host name '8.8.8.8'
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Could not open backing image to determine size.
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With this patch applied, qemu-img connects to the server regardless of
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the bad certificate:
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$ ./qemu-img create -q -f qcow2 -b 'json: { "file.sslverify": "off", "file.driver": "https", "file.url": "https://8.8.8.8/foo" }' /var/tmp/file.qcow2
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qemu-img: /var/tmp/file.qcow2: CURL: Error opening file: The requested URL returned error: 404 Not Found
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(The 404 error is expected because 8.8.8.8 is not actually serving a
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file called "/foo".)
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Of course the default (without sslverify=off) remains to always check
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the certificate:
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$ ./qemu-img create -q -f qcow2 -b 'json: { "file.driver": "https", "file.url": "https://8.8.8.8/foo" }' /var/tmp/file.qcow2
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qemu-img: /var/tmp/file.qcow2: CURL: Error opening file: SSL: no alternative certificate subject name matches target host name '8.8.8.8'
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Could not open backing image to determine size.
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Further information about the two settings is available here:
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https://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYPEER.html
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https://curl.haxx.se/libcurl/c/CURLOPT_SSL_VERIFYHOST.html
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Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
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Message-id: 20180914095622.19698-1-rjones@redhat.com
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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(cherry picked from commit 637fa44ab80c6b317adf1d117494325a95daad60)
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Signed-off-by: Jeff Cody <jcody@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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block/curl.c | 2 ++
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1 file changed, 2 insertions(+)
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diff --git a/block/curl.c b/block/curl.c
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index aa42535..4d28f77 100644
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--- a/block/curl.c
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+++ b/block/curl.c
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@@ -483,6 +483,8 @@ static int curl_init_state(BDRVCURLState *s, CURLState *state)
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curl_easy_setopt(state->curl, CURLOPT_URL, s->url);
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curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYPEER,
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(long) s->sslverify);
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+ curl_easy_setopt(state->curl, CURLOPT_SSL_VERIFYHOST,
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+ s->sslverify ? 2L : 0L);
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if (s->cookie) {
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curl_easy_setopt(state->curl, CURLOPT_COOKIE, s->cookie);
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}
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--
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1.8.3.1
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