Dropbox API: (35) Unsupported SSL protocol version

Hello,
can u test the 3.1.2-bet2 again? I have changed the special things for Dropbox cert.

hi Daniel,
I tried 3.1.2-bet2.
still the same error ??

Dropbox API: (35) Unsupported SSL protocol version

isnt there a usefull way to debug the error?

seems to be a known bug in the latest curl update – see https://sourceforge.net/p/curl/bugs/1319/

maybe its gone with the next release

I pulled the latest src updates from the git repo.
Nop, still Dropbox API: (35) Unsupported SSL protocol version ??

Would it be possible BTW to add a flag such that this release of backwup would work again on a host with a self signed SSL certificate (so in src use of curl -k). As it did work up till 3.08

Hello, i changed the version on Github again. now you can add a filter
add_filter( 'backwpup_cacert_bundle', '__return_false' ); to disable ssl securty functions.

Hi Daniel,

Is your last post a work-around to get dropbox working?
Where do i put this, in which functions file? The plugin or the theme?

Thanks!

i temporarily commented out all occurences of

curl_setopt( $ch, CURLOPT_SSLVERSION, 3 )

in inc/class-destination-dropbox.php

this made the errormsg with unsupported ssl version go away but brings me to a new error message after the dropbox login:

Dropbox API: (77) error setting certificate verify locations: CAfile: /var/www/localhost/htdocs/_wp/wp-content/plugins/backwpup-master/vendor/dropbox-trusted-cert.crt CApath: /var/www/localhost/htdocs/_wp/wp-content/plugins/backwpup-master/vendor/

Using:

• WordPress version 3.8.1
• BackWPup version 3.1.2-beta3
• PHP version 5.5.7-pl0-gentoo
• MySQL version 5.1.70
• cURL version 7.34.0
• cURL SSL version OpenSSL/1.0.1e

Edit:
After copying the dropbox-trusted-cert.crt to ./vendor it worked.
File seems to be missing in 3.1.2-beta3 but is included in 3.1.2-beta2.

Hello, Sorry i have forgotten to remove two lines.

@rpielanen: you need the version from Github and wirt a plugin like:

<?php
/**
 * Plugin Name: Disable BackWPup SSL cer bundle
 * Description: Reduce security for SSL connections
 * Author: You
 * Version: 0.0.1
 */
if ( ! defined( 'ABSPATH' ) )
 exit;

/**
 * Load plugin.
 *
 */
function mp14211510() {

 add_filter( 'backwpup_cacert_bundle', '__return_false' );

}
add_action( 'plugins_loaded', 'mp14211510' );

I created a plugin to ‘extend’ the backwpup plugin (3.1.2beta3) almost exactly as suggested by Daniel:

if ( ! defined( 'ABSPATH' ) ) exit;

function insecure_backwpup() {
 if (has_filter('backwpup_cacert_bundle')) {
   add_filter( 'backwpup_cacert_bundle', '__return_false', -1000);
  }
}

add_action( 'plugins_loaded', 'insecure_backwpup' );

I network activated the created plugin (I am running wp multi-site)

Dropbox authentication in backwpup seems to be working : )
But whether or not I activate the plugin filter doesn’t seem to make any difference (??)

In previous releases however (3.0.13) I still got the Unsupported SSL protocol version issue even with just Dropbox re-authentication, not anymore in 3.1.2beta3

Unfortunately I cannot run any backup job still, since this issue with the self-signed SSL certificate, introduced I guess in backwpup 3.1.x has not been solved (for me)

Will checkout workaround as suggested by ckarich shortly

testing with:
wp 3.8.1 multi-site
php 5.4.24
mysql 5.5.30
curl 7.34.0
openssl 1.0.1e

@pumpkineater: if (has_filter('backwpup_cacert_bundle')) { can not work because ther is no filter rigesterd for this hook as default.

If the filter set to false it will do the same as ckarich suggest.

@daniel

the if (has_filter('backwpup_cacert_bundle')) condition evaluates to TRUE, so add_filter statement is executed anyway

Anyway, does this filter ‘solve’ the issue with Dropbox for some users?
I can’t test it at the moment..

@pumpkineater: it should solve it i hope. But i can’T reproduce the problem on my servers.

curl 7.35.0 has been released (https://curl.haxx.se/changes.html#7_35_0)

couldnt try it out yet, because it not yet in my distros package management system.

it should fix the error 35 problem without any workarounds (filters, plugins, commenting out sections) – atleast thats my understanding of the underlying curl-problem. maybe anyone could test it and report back.

@ckarich, thanks for the info

I get the 35 error with wp/backwpup plugin (no workaround applied) but I can’t replicate the error by curl -I -3 https://www.google.com/ , which should with curl 7.34.0 currently still installed on my server….

I am not so keen at the moment to put the server in a poor state by installing curl 7.35 from source with broken dependencies

you cant? thats odd .. because here i can replicate the error with 7.34.0:

ckarich@xt ~ $ curl -v -I -3 https://www.google.com/
* Hostname was NOT found in DNS cache
* Trying 173.194.112.209…
* Adding handle: conn: 0x6585b0
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* – Conn 0 (0x6585b0) send_pipe: 1, recv_pipe: 0
* Connected to https://www.google.com (173.194.112.209) port 443 (#0)
* Unsupported SSL protocol version
* Closing connection 0
curl: (35) Unsupported SSL protocol version