[Bug 1258900] Re: Ecryptfs,cryptsetup p/w prompt enter key failures

[Steve Langasek]

> crypto_LUKS is a mount extension provided by libpam-mount and its
> functionality does not fail outside of the scope of the specified
> behavior.

Ah.  Then this is a libpam-mount bug, for sure, for doing something that
is communicating directly with the console.

** Package changed: cryptsetup (Ubuntu) => libpam-mount (Ubuntu)

** Changed in: libpam-mount (Ubuntu)
       Status: Incomplete => New

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Title:
  Ecryptfs,cryptsetup p/w prompt enter key failures

Status in cryptsetup:
  New
Status in “ecryptfs-utils” package in Ubuntu:
  New
Status in “libpam-mount” package in Ubuntu:
  New

Bug description:
  1. With ecryptsfs:

  /etc/fstab:
  /root/ecfs_data /root/ecfs ecryptfs rw,exec,suid 0 0

  a) Pressing the enter key quickly with no other input returns that some input is required.
  b) Pressing the enter key the first time subsequent to some input appears to append a return character to the password string. Pressing the enter subsequent to that submits the now incorrect password resulting in failure.
  c) If you hold the enter key, it sends multiple return characters, some times some of them appear to be appended to the password string, until eventually they start being sent to subsequent prompts.  It would appear that sometimes multiple return characters are added to the password string because the signatures change on various attempts.

  c) may be relevant in the sense that the holding the enter key in #2
  facilitates a workaround.

  2. The password prompt created by cryptsetup exhibits similar behavior
  but can be worked around by holding the enter key.

  /etc/fstab:
  /root/e_data /root/e crypto_LUKS defaults 0 0

  b) Pressing the enter key without any input specifies that the password was incorrect.
  a) Pressing the enter key the first time subsequent to some input appears to append a return character to the password string. A subsequent press of the enter key submits the now incorrect password.
  c) Holding the enter key subsequent to entering the password facilitates mounting. However, there are no further messages specifying success. Boot continues.

  In both instances of #1 and #2, the data from previous boot
  instructions appears past the `Password:` semicolon, ie:

  Password: /dev/sda1: 333 files, 13026/126976 clusters

  This does not appear to affect the success of 2.c.

  3. The following may look like it is unrelated but consider the fact
  that the password prompt is not halted and the fact that this should
  in fact work.

  The reason why I think the following is related is because I think
  that it's possible that it is returning from the password prompt and
  failing the crypttab execution asynchronously if that is perhaps how
  the relevant executables (upstart?) operate.

  /etc/crypttab:
  swap_e /dev/sda8 /dev/urandom swap

  /etc/fstab:
  /dev/mapper/swap_e none swap sw 0 0 #<-- if this is before the next line, it specifies that /dev/mapper/swape does not exist, and auto returns from the ecryptfs password prompt
  /root/ecfs_data /root/ecfs ecryptfs rw,exec,suid 0 0

  As specified, when the ecryptfs mount entry in fstab is after the swap
  mount, it specifies that the /dev/mapper/swape disk does not exist and
  auto skips the ecryptfs mount, auto returning from the password prompt
  and said mount failure is not recorded in /var/log/boot.log.

  System:

  Ubuntu 12.04.3 LTS
  ecryptfs-utils 96-0ubuntu3
  cryptsetup-luks 2:1.6.1-1ubuntu1
  libpam-mount 2.14-1

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