Bug 679907
| Summary: | please add atomic request to plymouth protocol for asking for cached passwords and input passwords | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Lennart Poettering <lpoetter> |
| Component: | plymouth | Assignee: | Ray Strode [halfline] <rstrode> |
| Status: | CLOSED WONTFIX | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 15 | CC: | awalls, bill-bugzilla.redhat.com, bruno, el, fedora, frankly3d, frigoris.ma, mishu, rstrode, twaugh |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2012-08-07 18:16:03 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
| Bug Depends On: | |||
| Bug Blocks: | 677438, 749027 | ||
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Description
Lennart Poettering
2011-02-23 20:15:51 UTC
Hmm, here's a simpler idea:
every time plymouth acquires a password it should increase a generation counter. Then, when a client wants to know cached passwords it just passes its last seen generation counter to Plymouth (0 initially). Plymouth then sends all passwords with a newer generation counter back. If there aren't any it asks the user for a new password, and assigns it the next free generation counter id. And in its response it always sends back to the client the newest generation counter it has.
Example:
client → server: Hey, give me all passwords with genid > 0
server → client: Hey, here are two. And my generation counter is currently 2.
And since those two were wrong, the client keeps asking:
client → server: Hey, give me all passwords with genid > 2
<server asks user for password, since it has no other passwords cached. Then assigns the new password genid 3>
server → client: here's a new one. And my generation counter is currently 3.
Client is happy now.
The big advantage of the second proposal is that we never have to send passwords we already know from the client to the server. This makes it easier to support similar agents that are unprivileged which then send passwords to clients, but never the other way round. I am not sure if this is really the same bug I am seeing. I provide a password early in the boot process for the / filesystem. Sometimes I get asked for the /home password later in the boot process, but not always. (This is the place that things used to hang.) I appear to have a bug related to password caching between systemd and plymouth. I have a newly installed Fedora 15 x86_64. I have a number of encrypted LVs: / swap /home /tmp /var /var/log /var/log/audit All use the same LUKS passphrase. Graphical passphrase entry for / (and swap?) appears to go OK. When /var needs to get unlocked, plymouth pauses the display of the "f" bubble filling in, and the graphics screen sometimes goes to a black screen. By pressing the up-arrow key on the keyboard, I get to a text console screen where there is a prompt to enter the passphrase for /var with two * characters already apparently typed. After backspacing over them and entering the passphase, /var gets unlocked and boot proceeds normally. -Andy I forgot to mention two things: 1. The problem is intermittent. Sometimes I do not need to type the password in againn at the text console. 2. The volume group and non-encrypted LVs from a previous install are still on the disk in another physical partition but are not in fstab. The text console show two messges about starting RAID, LVM,...) -Andy Any update on this problem? Will the comment from: https://bugzilla.redhat.com/show_bug.cgi?id=749027#c3 work in with grub2? And which of the /etc/grub.d/* should it go? Can we get an estimate when this will be resolved? This has to be by far the biggest regression of Fedora 15 and if it will be around for yet another year, I'll consider moving to another distribution. Imagine you're in a rather public place and then have to enter your password 4 times, or even 5 times because you typo it once (since hard disk passwords are usually long)! That is such a nuisance and yet it doesn't seem to be an impossible task to fix this. Have just noticed, on an upgrade from F14 > F15. The option for "Global Password" is gone. Which was there on F13,F14 Could that be part of the "plymouth" problem? (In reply to comment #8) > Have just noticed, on an upgrade from F14 > F15. > The option for "Global Password" is gone. > Which was there on F13,F14 > Could that be part of the "plymouth" problem? It is my understanding the architecture changed in F15. From what I can tell: 1. The initramfs scripts are responsible for unlocking the root and swap partitions listed on the kernel command line. The do this by doing something like: /bin/plymouth ask-for-password \ --prompt "$prompt" --number-of-tries=5 \ --command="/sbin/cryptsetup luksOpen -T1 $device $luksname" To ask the running plymouthd to prompt for a password. I assume plymouthd is also capable of caching passwords, so the user isn't asked more than once. 2. Once the system have done a pivot root out of the initramfs filesystem and over to the real root filesystem, systemd is run and it is responsible for unlocking the rest of the partitions. I assume systemd ultimately invokes systemd-ask-password to prompt for the password. It has password agents which I assume will ask plymouth for any cached password or to ask plymouth to reprompt the user. From man systemd-ask-password: "Existing agents are: a boot-time password agent asking the user for passwords using Plymouth; a boot-time password agent querying the user directly on the console;..." I speculate there is a breakdown of communications between the systemd-ask-password boot-time agent for Plymouth and the running plymouthd daemon. I also will speculate that systemd-ask-password is them falling back to it's console boot-time password agent. I don't know why turning on plymouth debug fixes the communications for me, but it does. HTH. Regards, Andy This message is a notice that Fedora 15 is now at end of life. Fedora has stopped maintaining and issuing updates for Fedora 15. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At this time, all open bugs with a Fedora 'version' of '15' have been closed as WONTFIX. (Please note: Our normal process is to give advanced warning of this occurring, but we forgot to do that. A thousand apologies.) 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