[Bug 2012147] [NEW] The documentation is insufficient to use cifs.upcall

[Karl O. Pinc]

Public bug reported:

It is not clear how to get k4b5 credential cache file name information
to cifs.upcall.

The documentation says that cifs.upcall can get the ccname from the
$KRB5CCNAME environment variable.  But it is not at all clear how to set
this environment variable to the correct value, particularly when
systemd.automount(5) is used to mount.

Further, as of this writing, in order to use many cifs.upcall features
the default krb5 ccname must be changed.  This is not documented.

(And I don't know if this is the right place to report this, but the
current krb5 DEFCCNAME seems to end with an _ followed by some sort of
hash.  There does not seem to be a documented krb5 parameter that
expands to such a hash.  Wouldn't such a thing be necessary in order to
properly generate the right ccname?)

See also: bug #2012140 bug #2012143 bug #2012145

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: cifs-utils 2:6.14-1ubuntu0.1
ProcVersionSignature: Ubuntu 5.15.0-67.74-generic 5.15.85
Uname: Linux 5.15.0-67-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.3
Architecture: amd64
CasperMD5CheckResult: pass
Date: Sat Mar 18 18:14:52 2023
InstallationDate: Installed on 2023-03-09 (9 days ago)
InstallationMedia: Ubuntu-Server 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230217.1)
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 TERM=xterm-256color
 PATH=(custom, no user)
SourcePackage: cifs-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: cifs-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug automount cifs cifs.upcall jammy krb5 multiuser smb uec-images

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https://bugs.launchpad.net/bugs/2012147

Title:
  The documentation is insufficient to use cifs.upcall

Status in cifs-utils package in Ubuntu:
  New

Bug description:
  It is not clear how to get k4b5 credential cache file name information
  to cifs.upcall.

  The documentation says that cifs.upcall can get the ccname from the
  $KRB5CCNAME environment variable.  But it is not at all clear how to
  set this environment variable to the correct value, particularly when
  systemd.automount(5) is used to mount.

  Further, as of this writing, in order to use many cifs.upcall features
  the default krb5 ccname must be changed.  This is not documented.

  (And I don't know if this is the right place to report this, but the
  current krb5 DEFCCNAME seems to end with an _ followed by some sort of
  hash.  There does not seem to be a documented krb5 parameter that
  expands to such a hash.  Wouldn't such a thing be necessary in order
  to properly generate the right ccname?)

  See also: bug #2012140 bug #2012143 bug #2012145

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: cifs-utils 2:6.14-1ubuntu0.1
  ProcVersionSignature: Ubuntu 5.15.0-67.74-generic 5.15.85
  Uname: Linux 5.15.0-67-generic x86_64
  ApportVersion: 2.20.11-0ubuntu82.3
  Architecture: amd64
  CasperMD5CheckResult: pass
  Date: Sat Mar 18 18:14:52 2023
  InstallationDate: Installed on 2023-03-09 (9 days ago)
  InstallationMedia: Ubuntu-Server 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230217.1)
  ProcEnviron:
   SHELL=/bin/bash
   LANG=en_US.UTF-8
   TERM=xterm-256color
   PATH=(custom, no user)
  SourcePackage: cifs-utils
  UpgradeStatus: No upgrade log present (probably fresh install)

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