convert:not authorized `aaaa` @ error/constitute.c/ReadImage/453

Question

I want to create a captcha pic by use convert from ImageMagick.

And I follow this, but there are some problem .

Input In my linux shell:

Answer 1

Note: the solution in this and other answers involves disabling safety measures that are there to fix arbitrary code execution vulnerabilities. See for instance this ghostscript-related and this ubuntu-related announcement. Only go forward with these solutions if the input to convert comes from a trusted source.

I use ImageMagick in php (v.7.1) to slice PDF file to images.

First I got errors like:

Exception type: ImagickException

Exception message: not authorized ..... @ error/constitute.c/ReadImage/412

After some changes in /etc/ImageMagick-6/policy.xml I start getting erroes like:

Exception type: ImagickException

Exception message: unable to create temporary file ..... Permission denied @ error/pdf.c/ReadPDFImage/465

My fix:

In file /etc/ImageMagick-6/policy.xml (or /etc/ImageMagick/policy.xml)

1. comment line

   <!-- <policy domain="coder" rights="none" pattern="MVG" /> -->
   

2. change line

   <policy domain="coder" rights="none" pattern="PDF" />
   

   to

   <policy domain="coder" rights="read|write" pattern="PDF" />
   

3. add line

   <policy domain="coder" rights="read|write" pattern="LABEL" />
   

Then restart your web server (nginx, apache).

Answer 2

I had this error when trying to convert a pdf to jpg and solved it using this method: sudo vi /etc/ImageMagick*/policy.xml

change:

policy domain="coder" rights="none" pattern="PDF"

to:

policy domain="coder" rights="read|write" pattern="PDF"

Source: http://realtechtalk.com/ImageMagick_Convert_PDF_Not_Authorized-2217-articles

Answer 3

Just delete /etc/ImageMagick/policy.xml file. E.g.

rm /etc/<ImageMagick_PATH>/policy.xml

For ImageMagick 6, it's:

sudo rm /etc/ImageMagick-6/policy.xml

Answer 4

After a recent update on my Ubuntu 16.04 system I have also started getting this error when trying to run convert on .ps files to convert them into pdfs.

This fix worked for me:

In a terminal run:

sudo gedit /etc/ImageMagick-6/policy.xml

This should open the policy.xml file in the gedit text editor. If it doesn't, your image magick might be installed in a different place. Then change

rights="none" 

to

rights="read | write" 

for PDF, EPS and PS lines near the bottom of the file. Save and exit, and image magick should then work again.

Answer 5

I also had the error error/constitute.c/ReadImage/453 when trying to convert an eps to a gif with image magick. I tried the solution proposed by sNICkerssss but still had errors (though different from the first one)e error/constitute.c/ReadImage/412 What solved the problem was to put read to other entries

 <policy domain="coder" rights="read" pattern="PS" />
 <policy domain="coder" rights="read" pattern="EPS" />
 <policy domain="coder" rights="read" pattern="PDF" />
 <policy domain="coder" rights="read" pattern="XPS" />
 <policy domain="coder" rights="read|write" pattern="LABEL" />