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| author | Paul Wolneykien <[email protected]> | 2021-10-15 17:29:51 +0300 |
|---|---|---|
| committer | GitHub <[email protected]> | 2021-10-15 16:29:51 +0200 |
| commit | ed6e6065bf0e85b64317b5a34b9f7a36a0c839a6 (patch) | |
| tree | 9327a81eb82146d7d43a5ec237040b12e2487de5 /src/gs-auth-pam.h | |
| parent | a2a282631d9ad88cf5e64f2379c5beb5ab3fab25 (diff) | |
| download | mate-screensaver-ed6e6065bf0e85b64317b5a34b9f7a36a0c839a6.tar.bz2 mate-screensaver-ed6e6065bf0e85b64317b5a34b9f7a36a0c839a6.tar.xz | |
Prompt-driven auth. helper
By the term "prompt-driven" I mean two-way conversation between the
screensaver dialog and the PAM stack. As you probably know, PAM works
by conversation with a dialog program asking the user to enter
something in answer to each message it sends. In the most conventional
case, the only question is "Password:" and the password is the only
data the user enters. But in general, the number of questions and
messages are not limited to that.
The previous support of PAM helper (gs-auth-helper.c) was written and
worked for the mentioned "only password" authentication scheme. For
other schemes it wasn't enough. New implementation fixes that
limitation.
Same as the previous version of gs-auth-helper.c, the new version uses
pipe interface for interprocess communication and synchronization.
However, unlike the previous version, new version uses two pipes
instead of a single pipe: the first one is used to transfer
prompt text from PAM via the helper to the screensaver dialog, and the
second one is used to transfer the user input from the dialog to
helper (and then the helper replies with it back to PAM). Having that
bidirectional prompt/reply channel it is possible to make as many
prompt/reply passes as required by PAM.
The present helper program (see the helper/ dir) is based on the
helper written by [email protected], which is in turn loosely based on
unix_chkpwd by Andrew Morgan.
All new code is untabified under the assumption the tab width is 8.
Signed-off-by: Paul Wolneykien <[email protected]>
Diffstat (limited to 'src/gs-auth-pam.h')
| -rw-r--r-- | src/gs-auth-pam.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/gs-auth-pam.h b/src/gs-auth-pam.h new file mode 100644 index 0000000..1d8a66f --- /dev/null +++ b/src/gs-auth-pam.h @@ -0,0 +1,54 @@ +/* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 8 -*- + * + * Copyright (c) 2019 Paul Wolneykien <[email protected]> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of the + * License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA + * 02110-1301, USA. + * + */ + +#ifndef __GS_AUTH_PAM_H +#define __GS_AUTH_PAM_H + +#include "gs-auth.h" + +G_BEGIN_DECLS + +static inline GSAuthMessageStyle +pam_style_to_gs_style (int pam_style) +{ + GSAuthMessageStyle style; + + switch (pam_style) + { + case PAM_PROMPT_ECHO_ON: + style = GS_AUTH_MESSAGE_PROMPT_ECHO_ON; + break; + case PAM_PROMPT_ECHO_OFF: + style = GS_AUTH_MESSAGE_PROMPT_ECHO_OFF; + break; + case PAM_ERROR_MSG: + style = GS_AUTH_MESSAGE_ERROR_MSG; + break; + default /* PAM_TEXT_INFO */: + style = GS_AUTH_MESSAGE_TEXT_INFO; + } + + return style; +} + +G_END_DECLS + +#endif /* __GS_AUTH_PAM_H */ |