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From: Sam Hartman <hartmans@debian.org>
Date: Mon, 11 Sep 2023 14:00:42 -0600
Subject: update-motd
Provide a more dynamic MOTD, based on the short-lived update-motd project.
Authors: Dustin Kirkland <kirkland@canonical.com>
Last-Update: 2019-02-12
Forwarded: no
Bug-Ubuntu: https://bugs.launchpad.net/bugs/399071
---
modules/pam_motd/pam_motd.8.xml | 11 +++++++++++
modules/pam_motd/pam_motd.c | 18 ++++++++++++++++++
2 files changed, 29 insertions(+)
diff --git a/modules/pam_motd/pam_motd.8.xml b/modules/pam_motd/pam_motd.8.xml
index 2fc5310..8369779 100644
--- a/modules/pam_motd/pam_motd.8.xml
+++ b/modules/pam_motd/pam_motd.8.xml
@@ -112,6 +112,17 @@
</para>
</listitem>
</varlistentry>
+ <varlistentry>
+ <term>
+ <option>noupdate</option>
+ </term>
+ <listitem>
+ <para>
+ Don't run the scripts in <filename>/etc/update-motd.d</filename>
+ to refresh the motd file.
+ </para>
+ </listitem>
+ </varlistentry>
</variablelist>
<para>
When no options are given, the default behavior applies for both
diff --git a/modules/pam_motd/pam_motd.c b/modules/pam_motd/pam_motd.c
index 89b2595..e6ce874 100644
--- a/modules/pam_motd/pam_motd.c
+++ b/modules/pam_motd/pam_motd.c
@@ -387,6 +387,7 @@ int pam_sm_open_session(pam_handle_t *pamh, int flags,
int argc, const char **argv)
{
int retval = PAM_IGNORE;
+ int do_update = 1;
const char *motd_path = NULL;
char *motd_path_copy = NULL;
size_t num_motd_paths = 0;
@@ -396,6 +397,7 @@ int pam_sm_open_session(pam_handle_t *pamh, int flags,
size_t num_motd_dir_paths = 0;
char **motd_dir_path_split = NULL;
int report_missing;
+ struct stat st;
if (flags & PAM_SILENT) {
return retval;
@@ -425,6 +427,9 @@ int pam_sm_open_session(pam_handle_t *pamh, int flags,
"motd_dir= specification missing argument - ignored");
}
}
+ else if (!strcmp(*argv,"noupdate")) {
+ do_update = 0;
+ }
else
pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
}
@@ -437,6 +442,19 @@ int pam_sm_open_session(pam_handle_t *pamh, int flags,
report_missing = 1;
}
+ /* Run the update-motd dynamic motd scripts, outputting to /run/motd.dynamic.
+ This will be displayed only when calling pam_motd with
+ motd=/run/motd.dynamic; current /etc/pam.d/login and /etc/pam.d/sshd
+ display both this file and /etc/motd. */
+ if (do_update && (stat("/etc/update-motd.d", &st) == 0)
+ && S_ISDIR(st.st_mode))
+ {
+ mode_t old_mask = umask(0022);
+ if (!system("/usr/bin/env -i PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin run-parts --lsbsysinit /etc/update-motd.d > /run/motd.dynamic.new"))
+ rename("/run/motd.dynamic.new", "/run/motd.dynamic");
+ umask(old_mask);
+ }
+
if (motd_path != NULL) {
motd_path_copy = strdup(motd_path);
}
|
