25 Aug
2024
25 Aug
'24
10:32 a.m.
Hi all!
I just found that KPDF is (again) asking for a password on non-password-protected PDFs and
fails to open the PDF if no password is given. The PDF preview in konqueror is fine. I
have attached a PDF that triggers the behaviour on my system (KPDF
14.2.0~pre65-0debian13.0.0+3~a).
Could somebody please verify?
Nik
--
Please do not email me anything that you are not comfortable also sharing with the NSA,
CIA ...
25 Aug
25 Aug
12:12 p.m.
On Sunday 25 August 2024 12.32:04 Dr. Nikolaus Klepp via tde-users wrote:
Hi all!
I just found that KPDF is (again) asking for a password on
non-password-protected PDFs and fails to open the PDF if no password is
given. The PDF preview in konqueror is fine. I have attached a PDF that
triggers the behaviour on my system (KPDF 14.2.0~pre65-0debian13.0.0+3~a).
Could somebody please verify?
Nik
Hi Nik,
I confirm that kpdf asks for a password. qpdf and Master PDF Editor don't.
pdfmod throws an error and can't open it either. Saving the document with one
of the programs that can open it does not remove this "fake password".
Thierry
1:24 p.m.
On Sunday 25 Aug 2024 12:32:04 Dr. Nikolaus Klepp via tde-users wrote:
Hi all!
I just found that KPDF is (again) asking for a password on
non-password-protected PDFs and fails to open the PDF if no password is
given. The PDF preview in konqueror is fine. I have attached a PDF that
triggers the behaviour on my system (KPDF 14.2.0~pre65-0debian13.0.0+3~a).
Could somebody please verify?
Nik
Hello,
I tried to open your file ch32v003rm.pdf in Okular, running in Trinity, and it
asked for a password. I am running an old Trinity system, installed around
March 2017 over KDE4 installed from a late version of Debian Jessie, and I can
choose whether I use Trinity versions or KDE4 versions of programs. I always
use Okular to read pdf files. Looking at About KDE, under Help in Okular,
shows KDE Platform Version 4.14.2. Looking at About Okular, shows Okular
Version 0.20.2, Using KDE Development Platform 4.14.2.
I saved your file from KMail to Documents/ before trying to open it in Okular,
so the problem with Okular asking for a password for the file is not caused by
trying to open it directly from KMail.
I first saw this strange behaviour, where Okular asks for a password for one
of my own files, that I never encrypted and never assigned a password for,
just about a month or two ago. I have been using Okular in Trinity to read
pdf files since around March 2017, exactly the same Okular, with no new
installation or update, and no change to my Trinity platform, since the
original installation around March 2017.
The pdf files which Okular suddenly started asking for a password for, are pdf
files that I sent to myself as email attachments to an email sent via Google
GMail, as a convenient means of sending the files from one computer to
another. I can read those pdf files by logging in to Google GMail and reading
them IN GMAIL, but it seems that GMail started encrypting pdf files sent as
attachments via GMail, some time around September last year. I never tried to
look at the pdf files I sent via GMail last September, until a month or two
ago, which was when I first saw the problem. pdf files sent as attachments
via GMail before around September last year seem to be unencrypted, while pdf
files sent as attachments via GMail from around September last year onwards,
seem to be encrypted, and can only be read IN GMAIL.
Chris
4:27 p.m.
On Sun, 25 Aug 2024 12:32:04 +0200
"Dr. Nikolaus Klepp via tde-users" <users(a)trinitydesktop.org> wrote:
Hi all!
I just found that KPDF is (again) asking for a password on non-password-protected PDFs
and fails to open the PDF if no password is given. The PDF preview in konqueror is fine. I
have attached a PDF that triggers the behaviour on my system (KPDF
14.2.0~pre65-0debian13.0.0+3~a).
Could somebody please verify?
The file is encrypted, which would explain the password:
$ pdfinfo ch32v003rm.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 07:25:23 2024 EDT
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:no addNotes:yes algorithm:AES-256)
Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2283093 bytes
Optimized: no
PDF version: 1.7
How it ended up that way, I couldn't say. The "Producer:" line
suggests that this is not being done on your system, so if it didn't
start out encrypted, it's being tampered with in transit somewhere.
Doesn't look like a kpdf issue, anyway.
E. Liddell
5:37 p.m.
Anno domini 2024 Sun, 25 Aug 12:27:44 -0400
E. Liddell via tde-users scripsit:
On Sun, 25 Aug 2024 12:32:04 +0200
"Dr. Nikolaus Klepp via tde-users" <users(a)trinitydesktop.org> wrote:
Well, xpdf has no problem opening the file without password, nor has firefox, so it's
either a kpdf or better a libpoppler issue. pdfinfo uses libpoppler, too, so that says
it's a libpoppler problem.
The same thing happened some years ago and was somehow solved. This is most likely a
regression.
Nik
Hi all!
I just found that KPDF is (again) asking for a password on non-password-protected PDFs
and fails to open the PDF if no password is given. The PDF preview in konqueror is fine. I
have attached a PDF that triggers the behaviour on my system (KPDF
14.2.0~pre65-0debian13.0.0+3~a).
Could somebody please verify?
The file is encrypted, which would explain the password:
$ pdfinfo ch32v003rm.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 07:25:23 2024 EDT
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:no addNotes:yes algorithm:AES-256)
Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2283093 bytes
Optimized: no
PDF version: 1.7
How it ended up that way, I couldn't say. The "Producer:" line
suggests that this is not being done on your system, so if it didn't
start out encrypted, it's being tampered with in transit somewhere.
Doesn't look like a kpdf issue, anyway.
E. Liddell
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--
Please do not email me anything that you are not comfortable also sharing with the NSA,
CIA ...
26 Aug
26 Aug
12:29 a.m.
On 8/25/24 11:27 AM, E. Liddell via tde-users wrote:
Encrypted: yes (print:yes copy:yes change:no
addNotes:yes algorithm:AES-256)
The issue seems to be our dear kpdf not interpreting the pdf parameters
correctly. I strongly suspect kpdf has no idea how to handle AES-256 encrypted
data (was likely not part of .pdf in 2005 timeframe) It may also be not
handling the print:, copy:, change:, addNote: restrictions correctly either.
Wherever the failure occurs it is tipping the password prompt in hopes of
correcting it.
xpdf, firefox, etc. have likely been updated to handle the new restrictions
and encryption correctly.
Time for a bounty on kpdf (or grab from current occular if possible and backport)
--
David C. Rankin, J.D.,P.E.
30 Nov
30 Nov
11:18 a.m.
Good day everyone,
just to add to what has been said, to modify the PDF file to make it
readable by kpdf, see below…
Am Sonntag, 25. August 2024 schrieb E. Liddell via tde-users:
On Sun, 25 Aug 2024 12:32:04 +0200
"Dr. Nikolaus Klepp via tde-users" <users(a)trinitydesktop.org> wrote:
$ pdfinfo ch32v003rm.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 12:25:23 2024 CET
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:no addNotes:yes
algorithm:AES-256)
Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2283093 bytes
Optimized: no
PDF version: 1.7
# change the password with a 40 bit one
$ qpdf --allow-weak-crypto --encrypt '' '' 40 -- ch32v003rm.pdf
ch32v003rm.new.pdf
$ pdfinfo ch32v003rm.new.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 12:25:23 2024 CET
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:yes addNotes:yes
algorithm:RC4)
Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2288192 bytes
Optimized: no
PDF version: 1.7
Now kpdf is able to open and show the file. See also:
https://mirror.git.trinitydesktop.org/gitea/TDE/tdegraphics/issues/29#issue…
HTH
Stefan
Hi all!
I just found that KPDF is (again) asking for a password on
non-password-protected PDFs and fails to open the PDF if no
password is given. The PDF preview in konqueror is fine. I have
attached a PDF that triggers the behaviour on my system (KPDF
14.2.0~pre65-0debian13.0.0+3~a).
Could somebody please verify?
The file is encrypted, which would explain the password:
$ pdfinfo ch32v003rm.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 07:25:23 2024 EDT
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:no addNotes:yes
algorithm:AES-256) Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2283093 bytes
Optimized: no
PDF version: 1.7
8 Dec
8 Dec
3:01 p.m.
Hi Stefan!
Anno domini 2024 Sat, 30 Nov 12:18:58 +0100
Stefan Krusche via tde-users scripsit:
Good day everyone,
just to add to what has been said, to modify the PDF file to make it
readable by kpdf, see below…
Am Sonntag, 25. August 2024 schrieb E. Liddell via tde-users:
So this lead me to a viable solution to automatically remove those pesky passwords:
- Place the attached programm in your path
- make it executeable
In /opt/trinity/share/applications/tde/kpdf.desktop, change the "Exec=" to
this:
Exec=decrypt-pdf %U; kpdf %U %i -caption "%c"
... Now when KPDF opens a file it will first be sanitized (if possible) and then kpdf
opens the unlocked file. Not as clean as I would like it to be, but good enough for me :)
Nik
--
Please do not email me anything that you are not comfortable also sharing with the NSA,
CIA ...
On Sun, 25 Aug 2024 12:32:04 +0200
"Dr. Nikolaus Klepp via tde-users" <users(a)trinitydesktop.org> wrote:
$ pdfinfo ch32v003rm.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 12:25:23 2024 CET
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:no addNotes:yes
algorithm:AES-256)
Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2283093 bytes
Optimized: no
PDF version: 1.7
# change the password with a 40 bit one
$ qpdf --allow-weak-crypto --encrypt '' '' 40 -- ch32v003rm.pdf
ch32v003rm.new.pdf
$ pdfinfo ch32v003rm.new.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 12:25:23 2024 CET
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:yes addNotes:yes
algorithm:RC4)
Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2288192 bytes
Optimized: no
PDF version: 1.7
Now kpdf is able to open and show the file. See also:
https://mirror.git.trinitydesktop.org/gitea/TDE/tdegraphics/issues/29#issue…
HTH
Stefan Hi all!
I just found that KPDF is (again) asking for a password on
non-password-protected PDFs and fails to open the PDF if no
password is given. The PDF preview in konqueror is fine. I have
attached a PDF that triggers the behaviour on my system (KPDF
14.2.0~pre65-0debian13.0.0+3~a).
Could somebody please verify?
The file is encrypted, which would explain the password:
$ pdfinfo ch32v003rm.pdf
Title: CH32V003RM-EN
Author: WCH
Creator: pdfFactory Pro pdffactorychina.cn
Producer: pdfFactory Pro 8.31 (Windows 11
CreationDate: Mon Mar 11 07:25:23 2024 EDT
Custom Metadata: no
Metadata Stream: no
Tagged: no
UserProperties: no
Suspects: no
Form: none
JavaScript: no
Pages: 185
Encrypted: yes (print:yes copy:yes change:no addNotes:yes
algorithm:AES-256) Page size: 595.32 x 841.92 pts (A4)
Page rot: 0
File size: 2283093 bytes
Optimized: no
PDF version: 1.7 
9 Dec
9 Dec
2:46 p.m.
Dr. Nikolaus Klepp via tde-users wrote:
Why don't you add this to TGW, it could be implemented at some point of time
Hi Stefan!
Anno domini 2024 Sat, 30 Nov 12:18:58 +0100
Stefan Krusche via tde-users scripsit:
> Good day everyone,
>
> just to add to what has been said, to modify the PDF file to make it
> readable by kpdf, see below…
>
> Am Sonntag, 25. August 2024 schrieb E. Liddell via tde-users:
> > On Sun, 25 Aug 2024 12:32:04 +0200
> >
> > "Dr. Nikolaus Klepp via tde-users"
> > <users(a)trinitydesktop.org> wrote:
> > > Hi all!
> > >
> > > I just found that KPDF is (again) asking for a password on
> > > non-password-protected PDFs and fails to open the PDF if no
> > > password is given. The PDF preview in konqueror is fine. I have
> > > attached a PDF that triggers the behaviour on my system (KPDF
> > > 14.2.0~pre65-0debian13.0.0+3~a).
> > >
> > > Could somebody please verify?
> >
> > The file is encrypted, which would explain the password:
> >
> > $ pdfinfo ch32v003rm.pdf
> > Title: CH32V003RM-EN
> > Author: WCH
> > Creator: pdfFactory Pro pdffactorychina.cn
> > Producer: pdfFactory Pro 8.31 (Windows 11
> > CreationDate: Mon Mar 11 07:25:23 2024 EDT
> > Custom Metadata: no
> > Metadata Stream: no
> > Tagged: no
> > UserProperties: no
> > Suspects: no
> > Form: none
> > JavaScript: no
> > Pages: 185
> > Encrypted: yes (print:yes copy:yes change:no addNotes:yes
> > algorithm:AES-256) Page size: 595.32 x 841.92 pts (A4)
> > Page rot: 0
> > File size: 2283093 bytes
> > Optimized: no
> > PDF version: 1.7
>
> $ pdfinfo ch32v003rm.pdf
> Title: CH32V003RM-EN
> Author: WCH
> Creator: pdfFactory Pro pdffactorychina.cn
> Producer: pdfFactory Pro 8.31 (Windows 11
> CreationDate: Mon Mar 11 12:25:23 2024 CET
> Custom Metadata: no
> Metadata Stream: no
> Tagged: no
> UserProperties: no
> Suspects: no
> Form: none
> JavaScript: no
> Pages: 185
> Encrypted: yes (print:yes copy:yes change:no addNotes:yes
> algorithm:AES-256)
> Page size: 595.32 x 841.92 pts (A4)
> Page rot: 0
> File size: 2283093 bytes
> Optimized: no
> PDF version: 1.7
>
> # change the password with a 40 bit one
> $ qpdf --allow-weak-crypto --encrypt '' '' 40 -- ch32v003rm.pdf
> ch32v003rm.new.pdf
>
> $ pdfinfo ch32v003rm.new.pdf
> Title: CH32V003RM-EN
> Author: WCH
> Creator: pdfFactory Pro pdffactorychina.cn
> Producer: pdfFactory Pro 8.31 (Windows 11
> CreationDate: Mon Mar 11 12:25:23 2024 CET
> Custom Metadata: no
> Metadata Stream: no
> Tagged: no
> UserProperties: no
> Suspects: no
> Form: none
> JavaScript: no
> Pages: 185
> Encrypted: yes (print:yes copy:yes change:yes addNotes:yes
> algorithm:RC4)
> Page size: 595.32 x 841.92 pts (A4)
> Page rot: 0
> File size: 2288192 bytes
> Optimized: no
> PDF version: 1.7
>
> Now kpdf is able to open and show the file. See also:
>
https://mirror.git.trinitydesktop.org/gitea/TDE/tdegraphics/issues/29#issue…
HTH
Stefan
So this lead me to a viable solution to automatically remove those pesky
passwords:
- Place the attached programm in your path
- make it executeable
In /opt/trinity/share/applications/tde/kpdf.desktop, change the "Exec=" to
this:
Exec=decrypt-pdf %U; kpdf %U %i -caption "%c"
... Now when KPDF opens a file it will first be sanitized (if possible)
and then kpdf opens the unlocked file. Not as clean as I would like it to
be, but good enough for me :)
Nik
112
days inactive
218
days old
8 comments
7 participants
participants (7)
-
Chris Austin -
David C. Rankin -
deloptes -
Dr. Nikolaus Klepp -
E. Liddell -
Stefan Krusche -
Thierry de Coulon