| 2019-06-17 08:02:21 |
Benjamin Schneider |
bug |
|
|
added bug |
| 2019-06-19 17:59:33 |
Andreas Hasenack |
bug |
|
|
added subscriber Andreas Hasenack |
| 2019-06-25 08:48:57 |
Christian Ehrhardt |
bug task added |
|
openssl (Ubuntu) |
|
| 2019-06-25 08:49:12 |
Christian Ehrhardt |
summary |
18.04/Apache2: rejecting client initiated renegotiation |
18.04/Apache2: rejecting client initiated renegotiation due to openssl 1.1.1 |
|
| 2019-06-25 08:49:18 |
Christian Ehrhardt |
bug |
|
|
added subscriber Dimitri John Ledkov |
| 2019-06-25 08:49:24 |
Christian Ehrhardt |
bug |
|
|
added subscriber Christian Ehrhardt |
| 2019-06-25 12:51:37 |
Launchpad Janitor |
apache2 (Ubuntu): status |
New |
Confirmed |
|
| 2019-06-25 12:51:37 |
Launchpad Janitor |
openssl (Ubuntu): status |
New |
Confirmed |
|
| 2019-06-25 23:09:12 |
Brian Murray |
tags |
|
regression-update rls-bb-incoming |
|
| 2019-06-27 15:31:33 |
Paride Legovini |
bug |
|
|
added subscriber Paride Legovini |
| 2019-06-28 13:01:38 |
Petter A. Urkedal |
bug |
|
|
added subscriber Petter A. Urkedal |
| 2019-06-28 13:59:47 |
Andreas Hasenack |
bug watch added |
|
https://bz.apache.org/bugzilla/show_bug.cgi?id=62691 |
|
| 2019-06-28 16:42:35 |
Andreas Hasenack |
nominated for series |
|
Ubuntu Cosmic |
|
| 2019-06-28 16:42:35 |
Andreas Hasenack |
bug task added |
|
apache2 (Ubuntu Cosmic) |
|
| 2019-06-28 16:42:35 |
Andreas Hasenack |
bug task added |
|
openssl (Ubuntu Cosmic) |
|
| 2019-06-28 16:42:35 |
Andreas Hasenack |
nominated for series |
|
Ubuntu Bionic |
|
| 2019-06-28 16:42:35 |
Andreas Hasenack |
bug task added |
|
apache2 (Ubuntu Bionic) |
|
| 2019-06-28 16:42:35 |
Andreas Hasenack |
bug task added |
|
openssl (Ubuntu Bionic) |
|
| 2019-06-28 16:42:53 |
Andreas Hasenack |
openssl (Ubuntu): status |
Confirmed |
Incomplete |
|
| 2019-06-28 16:43:08 |
Andreas Hasenack |
bug task deleted |
openssl (Ubuntu Bionic) |
|
|
| 2019-06-28 16:43:19 |
Andreas Hasenack |
bug task deleted |
openssl (Ubuntu Cosmic) |
|
|
| 2019-06-28 16:44:01 |
Andreas Hasenack |
apache2 (Ubuntu Bionic): status |
New |
Confirmed |
|
| 2019-06-28 16:44:06 |
Andreas Hasenack |
apache2 (Ubuntu Cosmic): status |
New |
Confirmed |
|
| 2019-06-28 16:53:47 |
Benjamin Baumer |
bug |
|
|
added subscriber Benjamin Baumer |
| 2019-07-01 14:37:58 |
Andreas Hasenack |
description |
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
* An explanation of the effects of the bug on users and
* justification for backporting the fix to the stable release.
* In addition, it is helpful, but not required, to include an
explanation of how the upload fixes this bug.
[Test Case]
* detailed instructions how to reproduce the bug
* these should allow someone who is not familiar with the affected
package to reproduce the bug and verify that the updated package fixes
the problem.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 14:41:02 |
Andreas Hasenack |
description |
[Impact]
* An explanation of the effects of the bug on users and
* justification for backporting the fix to the stable release.
* In addition, it is helpful, but not required, to include an
explanation of how the upload fixes this bug.
[Test Case]
* detailed instructions how to reproduce the bug
* these should allow someone who is not familiar with the affected
package to reproduce the bug and verify that the updated package fixes
the problem.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
* An explanation of the effects of the bug on users and
* justification for backporting the fix to the stable release.
* In addition, it is helpful, but not required, to include an
explanation of how the upload fixes this bug.
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
ubuntu.pem
ubuntu.key
cacert.pem
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 14:55:11 |
Andreas Hasenack |
description |
[Impact]
* An explanation of the effects of the bug on users and
* justification for backporting the fix to the stable release.
* In addition, it is helpful, but not required, to include an
explanation of how the upload fixes this bug.
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
ubuntu.pem
ubuntu.key
cacert.pem
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (15s or more if modreqtimeout is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
ubuntu.pem
ubuntu.key
cacert.pem
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 14:57:28 |
Andreas Hasenack |
attachment added |
|
cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem |
|
| 2019-07-01 14:57:46 |
Andreas Hasenack |
attachment added |
|
ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem |
|
| 2019-07-01 14:58:02 |
Andreas Hasenack |
attachment added |
|
ubuntu.key https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key |
|
| 2019-07-01 14:58:16 |
Andreas Hasenack |
attachment added |
|
client-auth.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274495/+files/client-auth.pem |
|
| 2019-07-01 14:58:36 |
Andreas Hasenack |
attachment added |
|
client-auth.key https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274496/+files/client-auth.key |
|
| 2019-07-01 15:00:30 |
Andreas Hasenack |
description |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (15s or more if modreqtimeout is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
ubuntu.pem
ubuntu.key
cacert.pem
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (15s or more if modreqtimeout is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 15:06:15 |
Oibaf |
bug |
|
|
added subscriber Oibaf |
| 2019-07-01 16:25:48 |
Andreas Hasenack |
description |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (15s or more if modreqtimeout is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (about 15s if modreqtimeout is enabled, more if it is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 16:49:41 |
Andreas Hasenack |
description |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (about 15s if modreqtimeout is enabled, more if it is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
* discussion of how regressions are most likely to manifest as a result of this change.
* It is assumed that any SRU candidate patch is well-tested before
upload and has a low overall risk of regression, but it's important
to make the effort to think about what ''could'' happen in the
event of a regression.
* This both shows the SRU team that the risks have been considered,
and provides guidance to testers in regression-testing the SRU.
[Other Info]
* Anything else you think is useful to include
* Anticipate questions from users, SRU, +1 maintenance, security teams and the Technical Board
* and address these questions in advance
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (about 15s if modreqtimeout is enabled, more if it is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
This is reverting, in mod_ssl, a settings change that was made in openssl 1.1.1. It's committed upstream in mod_ssl, and I found no other follow-up commits about this.
This being SSL-related, of course it can have surprises and be complicated. The openssl commit even warns that hangs could occur (which happened in this bug here), and it's expected that applications that are affected adjust accordingly.
[Other Info]
The upstream mod_ssl commit that made this change also changed something else in the code, but we decided to not adopt it because it's TLSv1.3 specific, and that version of the protocol is not enabled in the apache builds from bionic or cosmic. TLSv1.3 is deemed complete only in apache 2.4.37 and later (http://www.apache.org/dist/httpd/CHANGES_2.4.37)
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 16:57:49 |
Andreas Hasenack |
description |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (about 15s if modreqtimeout is enabled, more if it is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
This is reverting, in mod_ssl, a settings change that was made in openssl 1.1.1. It's committed upstream in mod_ssl, and I found no other follow-up commits about this.
This being SSL-related, of course it can have surprises and be complicated. The openssl commit even warns that hangs could occur (which happened in this bug here), and it's expected that applications that are affected adjust accordingly.
[Other Info]
The upstream mod_ssl commit that made this change also changed something else in the code, but we decided to not adopt it because it's TLSv1.3 specific, and that version of the protocol is not enabled in the apache builds from bionic or cosmic. TLSv1.3 is deemed complete only in apache 2.4.37 and later (http://www.apache.org/dist/httpd/CHANGES_2.4.37)
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (about 15s if modreqtimeout is enabled, more if it is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
cd /root
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274495/+files/client-auth.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274496/+files/client-auth.key
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
This is reverting, in mod_ssl, a settings change that was made in openssl 1.1.1. It's committed upstream in mod_ssl, and I found no other follow-up commits about this.
This being SSL-related, of course it can have surprises and be complicated. The openssl commit even warns that hangs could occur (which happened in this bug here), and it's expected that applications that are affected adjust accordingly.
[Other Info]
The upstream mod_ssl commit that made this change also changed something else in the code, but we decided to not adopt it because it's TLSv1.3 specific, and that version of the protocol is not enabled in the apache builds from bionic or cosmic. TLSv1.3 is deemed complete only in apache 2.4.37 and later (http://www.apache.org/dist/httpd/CHANGES_2.4.37)
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 17:47:03 |
Andreas Hasenack |
description |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (about 15s if modreqtimeout is enabled, more if it is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
cd /root
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274495/+files/client-auth.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274496/+files/client-auth.key
client-auth.key
client-auth.pem
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
This is reverting, in mod_ssl, a settings change that was made in openssl 1.1.1. It's committed upstream in mod_ssl, and I found no other follow-up commits about this.
This being SSL-related, of course it can have surprises and be complicated. The openssl commit even warns that hangs could occur (which happened in this bug here), and it's expected that applications that are affected adjust accordingly.
[Other Info]
The upstream mod_ssl commit that made this change also changed something else in the code, but we decided to not adopt it because it's TLSv1.3 specific, and that version of the protocol is not enabled in the apache builds from bionic or cosmic. TLSv1.3 is deemed complete only in apache 2.4.37 and later (http://www.apache.org/dist/httpd/CHANGES_2.4.37)
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
[Impact]
Under the following conditions, https connections using client cert authentication will suffer a long delay (about 15s if modreqtimeout is enabled, more if it is disabled):
* TLSv1.2
* client certificate authentication in use
* a Location, Directory, or other such block defining the client certificate authentication for that block only, differing from the SSL vhost as a whole
This was triggered by the OpenSSL 1.1.1 SRU and was caused by this openssl change in SSL_MODE_AUTO_RETRY from disabled to enabled by default: https://github.com/openssl/openssl/blob/a4a90a8a3bdcb9336b5c9c15da419e99a87bc6ed/CHANGES#L121-L130
[Test Case]
It helps if you have lxd up and running. Otherwise, a VM or even bare metal host also works, as long as you stick to the "ubuntu" hostname.
Launch a container for the release you are testing. The command below is for bionic:
$ lxc launch ubuntu-daily:bionic ubuntu
Enter the container as root:
$ lxc exec ubuntu bash
Verify hostname is "ubuntu":
# hostname
ubuntu
Install apache2:
apt update && apt install apache2
Download the following files from this bug report and place them in /etc/apache2:
cd /etc/apache2
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274492/+files/cacert.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274493/+files/ubuntu.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274494/+files/ubuntu.key
Adjust permissions of the key file:
chmod 0640 /etc/apache2/ubuntu.key
chgrp www-data /etc/apache2/ubuntu.key
Download the client certificate and key files and place them in /root:
cd /root
wget https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274495/+files/client-auth.pem https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1833039/+attachment/5274496/+files/client-auth.key
Create this vhost file (caution, lines may wrap, in particular LogFormat: it should be one long line):
cat > /etc/apache2/sites-available/cert-auth-test.conf <<EOF
<IfModule mod_ssl.c>
<VirtualHost _default_:443>
LogLevel info ssl:warn
ServerAdmin webmaster@localhost
DocumentRoot /var/www/html
LogFormat "%h %l %u %t \"%r\" %>s %O \"%{Referer}i\" \"%{User-Agent}i\" protocol=%{SSL_PROTOCOL}x commonName=%{SSL_CLIENT_S_DN_CN}x" combined-ssl
ErrorLog \${APACHE_LOG_DIR}/error.log
CustomLog \${APACHE_LOG_DIR}/access.log combined-ssl
SSLEngine on
SSLCertificateFile /etc/apache2/ubuntu.pem
SSLCertificateKeyFile /etc/apache2/ubuntu.key
SSLCACertificateFile /etc/apache2/cacert.pem
<FilesMatch "\.(cgi|shtml|phtml|php)$">
SSLOptions +StdEnvVars
</FilesMatch>
<Directory /usr/lib/cgi-bin>
SSLOptions +StdEnvVars
</Directory>
<Location />
SSLVerifyClient require
Require ssl-verify-client
</Location>
</VirtualHost>
</IfModule>
EOF
Enable the ssl module and this new vhost we just created:
a2enmod ssl && a2ensite cert-auth-test.conf
Restart apache2:
systemctl restart apache2
If at this stage you try the following command, it will fail like this because no client certificate was provided:
# curl --output /dev/null https://ubuntu/ --cacert /etc/apache2/cacert.pem
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
curl: (56) OpenSSL SSL_read: error:14094410:SSL routines:ssl3_read_bytes:sslv3 alert handshake failure, errno 0
And the apache error log will confirm the reason:
[Mon Jul 01 14:10:23.312645 2019] [ssl:error] [pid 1685:tid 140326396421888] SSL Library Error: error:1417C0C7:SSL routines:tls_process_client_certificate:peer did not return a certificate -- No CAs known to server for verification?
Now retry, but providing the client certificate and key files, and forcing TLSv1.2 just to be sure. Due to the bug, the command will stall for about 15 seconds, but the index.html file will be downloaded:
# rm -f index.html
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 706 0 0:00:15 0:00:15 --:--:-- 2579
# ll index.html
-rw-r--r-- 1 root root 10918 Jul 1 14:15 index.html
Apache will log this in the error.log file:
[Mon Jul 01 14:15:38.014784 2019] [reqtimeout:info] [pid 1685:tid 140326278772480] [client 10.0.100.215:35108] AH01382: Request body read timeout
That is due to modreqtimeout kicking in.
In the access.log file, we will have the request:
10.0.100.215 - - [01/Jul/2019:14:15:22 +0000] "GET / HTTP/1.1" 200 16544 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
The protocol and commonName parts confirm the protocol that was used, and the commonName of the client certificate that was used for authentication.
So it works, but takes a long time for each request. This verifies the bug.
After installing the fixed apache2 packages, the download completes almost instantly:
# curl --output index.html https://ubuntu/ --cacert /etc/apache2/cacert.pem --cert client-auth.pem --key client-auth.key --tlsv1.2
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 10918 100 10918 0 0 333k 0 --:--:-- --:--:-- --:--:-- 333k
The apache access log confirms the protocol and that client certificate authentication was used:
10.0.100.215 - - [01/Jul/2019:14:29:56 +0000] "GET / HTTP/1.1" 200 16525 "-" "curl/7.58.0" protocol=TLSv1.2 commonName=client-auth
And the error log gets no new entries. This verifies the bug is fixed.
[Regression Potential]
This is reverting, in mod_ssl, a settings change that was made in openssl 1.1.1. It's committed upstream in mod_ssl, and I found no other follow-up commits about this.
This being SSL-related, of course it can have surprises and be complicated. The openssl commit even warns that hangs could occur (which happened in this bug here), and it's expected that applications that are affected adjust accordingly.
[Other Info]
The upstream mod_ssl commit that made this change also changed something else in the code, but we decided to not adopt it because it's TLSv1.3 specific, and that version of the protocol is not enabled in the apache builds from bionic or cosmic. TLSv1.3 is deemed complete only in apache 2.4.37 and later (http://www.apache.org/dist/httpd/CHANGES_2.4.37)
[Original Description]
I am using Apache2 with client certificate authentication.
Since recently (last week) and without any configuration changes, the following errors occur frequently:
AH02042: rejecting client initiated renegotiation
Client connections are very slow and sometimes it takes more than a minute until a weg page can be opened in the browser.
Before installation of the latest security fixes last week, this error did not occur.
Could it be related to https://bugs.launchpad.net/ubuntu/+source/apache2/+bug/1803689?
System information:
Description: Ubuntu 18.04.2 LTS
Release: 18.04
apache2:
Installiert: 2.4.29-1ubuntu4.6
Installationskandidat: 2.4.29-1ubuntu4.6
Versionstabelle:
*** 2.4.29-1ubuntu4.6 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
100 /var/lib/dpkg/status
2.4.29-1ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
openssl:
Installiert: 1.1.1-1ubuntu2.1~18.04.2
Installationskandidat: 1.1.1-1ubuntu2.1~18.04.2
Versionstabelle:
*** 1.1.1-1ubuntu2.1~18.04.2 500
500 http://de.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
100 /var/lib/dpkg/status
1.1.0g-2ubuntu4.3 500
500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
1.1.0g-2ubuntu4 500
500 http://de.archive.ubuntu.com/ubuntu bionic/main amd64 Packages |
|
| 2019-07-01 17:58:24 |
Launchpad Janitor |
merge proposal linked |
|
https://code.launchpad.net/~ahasenack/ubuntu/+source/apache2/+git/apache2/+merge/369541 |
|
| 2019-07-01 17:59:06 |
Launchpad Janitor |
merge proposal linked |
|
https://code.launchpad.net/~ahasenack/ubuntu/+source/apache2/+git/apache2/+merge/369542 |
|
| 2019-07-01 18:00:01 |
Andreas Hasenack |
apache2 (Ubuntu Cosmic): assignee |
|
Andreas Hasenack (ahasenack) |
|
| 2019-07-01 18:00:03 |
Andreas Hasenack |
apache2 (Ubuntu Bionic): assignee |
|
Andreas Hasenack (ahasenack) |
|
| 2019-07-01 18:00:06 |
Andreas Hasenack |
apache2 (Ubuntu Bionic): importance |
Undecided |
High |
|
| 2019-07-01 18:00:08 |
Andreas Hasenack |
apache2 (Ubuntu Cosmic): importance |
Undecided |
High |
|
| 2019-07-01 18:00:11 |
Andreas Hasenack |
apache2 (Ubuntu): importance |
Undecided |
Critical |
|
| 2019-07-01 18:00:17 |
Andreas Hasenack |
apache2 (Ubuntu): status |
Confirmed |
Fix Released |
|
| 2019-07-01 18:00:20 |
Andreas Hasenack |
apache2 (Ubuntu): importance |
Critical |
High |
|
| 2019-07-01 18:00:27 |
Andreas Hasenack |
apache2 (Ubuntu Bionic): status |
Confirmed |
In Progress |
|
| 2019-07-01 18:00:29 |
Andreas Hasenack |
apache2 (Ubuntu Cosmic): status |
Confirmed |
In Progress |
|
| 2019-07-01 18:00:31 |
Andreas Hasenack |
openssl (Ubuntu): status |
Incomplete |
Invalid |
|
| 2019-07-01 18:36:42 |
Virsacer |
bug |
|
|
added subscriber Virsacer |
| 2019-07-02 15:22:07 |
Brian Murray |
apache2 (Ubuntu Cosmic): status |
In Progress |
Fix Committed |
|
| 2019-07-02 15:22:08 |
Brian Murray |
bug |
|
|
added subscriber Ubuntu Stable Release Updates Team |
| 2019-07-02 15:22:10 |
Brian Murray |
bug |
|
|
added subscriber SRU Verification |
| 2019-07-02 15:22:17 |
Brian Murray |
tags |
regression-update rls-bb-incoming |
regression-update rls-bb-incoming verification-needed verification-needed-cosmic |
|
| 2019-07-02 15:23:36 |
Brian Murray |
apache2 (Ubuntu Bionic): status |
In Progress |
Fix Committed |
|
| 2019-07-02 15:23:46 |
Brian Murray |
tags |
regression-update rls-bb-incoming verification-needed verification-needed-cosmic |
regression-update rls-bb-incoming verification-needed verification-needed-bionic verification-needed-cosmic |
|
| 2019-07-04 18:00:38 |
Mathew Hodson |
bug task deleted |
openssl (Ubuntu) |
|
|
| 2019-07-05 14:00:44 |
Andreas Hasenack |
tags |
regression-update rls-bb-incoming verification-needed verification-needed-bionic verification-needed-cosmic |
regression-update rls-bb-incoming verification-done-bionic verification-needed verification-needed-cosmic |
|
| 2019-07-05 14:02:25 |
Andreas Hasenack |
tags |
regression-update rls-bb-incoming verification-done-bionic verification-needed verification-needed-cosmic |
regression-update rls-bb-incoming verification-done-bionic verification-done-cosmic verification-needed |
|
| 2019-07-11 08:45:53 |
Łukasz Zemczak |
removed subscriber Ubuntu Stable Release Updates Team |
|
|
|
| 2019-07-11 08:55:56 |
Launchpad Janitor |
apache2 (Ubuntu Cosmic): status |
Fix Committed |
Fix Released |
|
| 2019-07-11 09:20:07 |
Launchpad Janitor |
apache2 (Ubuntu Bionic): status |
Fix Committed |
Fix Released |
|
| 2019-10-08 21:14:25 |
Robie Basak |
tags |
regression-update rls-bb-incoming verification-done-bionic verification-done-cosmic verification-needed |
bionic-openssl-1.1 regression-update rls-bb-incoming verification-done-bionic verification-done-cosmic verification-needed |
|
