#755 pkispawn interpolation doesn't handle values that contain '%'
Closed: Fixed None Opened 9 years ago by nkinder.

If I create a pkispawn deployment config file that has a value with a '%' in it, the interpolation code throws an exception. For example, I created the following deployment file that uses a '%' character in the passwords:


If I then attempt to run pkispawn, I encounter this exception:

$ sudo pkispawn -s CA -f /home/nkinder/ca.cfg 
Loading deployment configuration from /home/nkinder/ca.cfg.
Traceback (most recent call last):
  File "/sbin/pkispawn", line 429, in <module>
  File "/sbin/pkispawn", line 320, in main
  File "/usr/lib/python2.7/site-packages/pki/deployment/pkiparser.py", line 454, in compose_pki_master_dictionary
  File "/usr/lib/python2.7/site-packages/pki/deployment/pkiparser.py", line 333, in flatten_master_dict
    default_dict = dict(self.pki_config.items('DEFAULT'))
  File "/usr/lib64/python2.7/ConfigParser.py", line 655, in items
    for option in options]
  File "/usr/lib64/python2.7/ConfigParser.py", line 691, in _interpolate
    self._interpolate_some(option, L, rawval, section, vars, 1)
  File "/usr/lib64/python2.7/ConfigParser.py", line 732, in _interpolate_some
    "'%%' must be followed by '%%' or '(', found: %r" % (rest,))
ConfigParser.InterpolationSyntaxError: '%' must be followed by '%' or '(', found: '%12'

There is an easy solution to using '%' in values in the pkispawn deployment file. The '%' character is used for interpolation in Python's ConfigParser class. To use a '%' character in a config value where you are not trying to do interpolation, you simply need to escape the character with a second '%'. For example, the following pkispawn deployment file works fine:


The solution might just be to document that escaping is needed for '%' characters in pkispawn deployment files.

I attempted an interactive creation of a CA using pkispawn, and it seems to work fine when the passwords use '%' characters, so it seems that it is already internally escaping values.

In addition to documenting that '%' characters must be escaped in deployment files in the pkispawn manpage, we should also try to print a helpful error message when we encounter an unescaped '%' character. It would be much more helpful if pkispawn said something like:

"Encountered an unescaped '%' character in <deployment file>. You must escape '%' characters in deployment file values (example - 'setting=some%%value')."

Pushed to master. Thanks to Ade for his review!

master - 443159f77e87a70bc85ab85f5ad58b9169def88a

Metadata Update from @nkinder:
- Issue set to the milestone: N/A

5 years ago

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