Invalid Base-64 String

[skoelzow]

Hi there I have a serious issue:
After adding a tag and syncing the the kdbx file, my KeePass on Windows cannot open it anymore (see screen shot).
I am using KeePass 2.50 (64-Bit) on Windows 11 Pro 21H2
Opening and using the file on NextCloud is still no problem. So I could export the database to xml an generate a new kdbx on windows.

KeeWeb v1.18.7 (dfc6201, 2021-11-30) on NextCloud 23.0.3 MariaDB 10 PHP 8
Environment: web
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:98.0) Gecko/20100101 Firefox/98.

0

[cyprienflx]

a workaround : switch file format to KDB4->KDB3

i think keeweb don't support KDB4.1 ;)

[skoelzow]

YESS! that was the trick thank you!
Is an upgrade to kdbx 4 compatibility planned?

[ilpssun]

I'm also looking forward to kdbx4 compatibility – or at least a patch release that prevents me from accidentally saving a broken kdbx4 file.

[ilpssun]

Seeing #2022, it does not seem likely to be resolved any time soon ☹️

[CyberFoxar]

Many thanks for this workaround. I can confirm that this is still an issue.

[AlBundy33]

According to the developer of KeePass this seems to be because keeweb does not store the last modification time in base64.

https://sourceforge.net/p/keepass/bugs/2231/
https://keepass.info/help/kb/kdbx_4.1.html#cd_lastmod

[AlBundy33]

after reading the projects I would assume that the issue is maybe here
https://github.com/keeweb/kdbxweb/blob/4bce1b0add2e4a6f34377b7cfa7c5ce2d49b16d7/lib/format/kdbx-custom-data.ts#L36

this line calls setDate
https://github.com/keeweb/kdbxweb/blob/4bce1b0add2e4a6f34377b7cfa7c5ce2d49b16d7/lib/utils/xml-utils.ts#L212
with only two arguments and therefore binary is false and the date is written as iso-string instead of base64

because the lastModificationTime is only written for dataases >= 4.1 - so it should be save to add the third parameter with true.

[AlBundy33]

I was able to build a patched version with working kdbx4 format
https://github.com/AlBundy33/keeweb_kdbx4_hotfix

you can give it a try if you want.

[sdoowo200leldls]

Any followup to this issue? Saving a new entry on KeeWeb and then opening the db on the KeePass Windows app or KeePass2Android app causes this error for me.

[AlBundy33]

no fix in this project because of #2022

you can try https://github.com/AlBundy33/keeweb_kdbx4_hotfix
this is just a Dockerfile that builds keeweb from github (latest release) and includes two bugfixes.