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From c51b28adf66a4597ff1c0cb0e0754b2968a337e2 Mon Sep 17 00:00:00 2001
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From: Alexander Bokovoy <abokovoy@redhat.com>
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Date: Thu, 8 Oct 2020 13:37:32 +0300
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Subject: [PATCH] Read HOME_MODE and UMASK from /etc/login.defs
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shadow-utils changed behavior of UMASK to only apply to runtime
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processes. For home directories, HOME_MODE variable was introduced
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instead.
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Read HOME_MODE and fall back to UMASK if that does not exist.
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Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
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---
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src/mkhomedir.c | 13 +++++++++----
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src/oddjobd-mkhomedir.conf.5.in | 3 ++-
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src/pam_oddjob_mkhomedir.8.in | 5 +++--
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3 files changed, 14 insertions(+), 7 deletions(-)
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diff --git a/src/mkhomedir.c b/src/mkhomedir.c
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index 1c0d8e4..be85959 100644
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--- a/src/mkhomedir.c
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+++ b/src/mkhomedir.c
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@@ -264,12 +264,13 @@ mkhomedir(const char *user, int flags)
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}
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static mode_t
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-get_umask(int *configured)
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+get_umask(int *configured, const char *variable)
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{
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FILE *fp;
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char buf[BUFSIZ], *p, *end;
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mode_t mask = umask(0777);
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long tmp;
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+ size_t vlen = strlen(variable);
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fp = fopen("/etc/login.defs", "r");
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if (fp != NULL) {
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@@ -279,10 +280,10 @@ get_umask(int *configured)
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}
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buf[strcspn(buf, "\r\n")] = '\0';
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p = buf + strspn(buf, " \t");
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- if (strncmp(p, "UMASK", 5) != 0) {
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+ if (strncmp(p, variable, vlen) != 0) {
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continue;
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}
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- p += 5;
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+ p += vlen;
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if (strspn(p, " \t") == 0) {
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continue;
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}
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@@ -308,7 +309,11 @@ main(int argc, char **argv)
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int i, configured_umask = 0, flags = FLAG_POPULATE;
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openlog(PACKAGE "-mkhomedir", LOG_PID, LOG_DAEMON);
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- override_umask = get_umask(&configured_umask);
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+ /* Unlike UMASK, HOME_MODE is the file mode, so needs to be reverted */
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+ override_umask = 0777 & ~get_umask(&configured_umask, "HOME_MODE");
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+ if (configured_umask == 0) {
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+ override_umask = get_umask(&configured_umask, "UMASK");
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+ }
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umask(override_umask);
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skel_dir = "/etc/skel";
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diff --git a/src/oddjobd-mkhomedir.conf.5.in b/src/oddjobd-mkhomedir.conf.5.in
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index b0cd934..d7a2429 100644
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--- a/src/oddjobd-mkhomedir.conf.5.in
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+++ b/src/oddjobd-mkhomedir.conf.5.in
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@@ -24,7 +24,8 @@ Override the location of the skeleton directory (by default: \fI/etc/skel\fR).
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-u
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Specify a umask whose bits are masked off of contents of the skeleton directory
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while they are copied to the user's new home directory. The default is read
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-from \fB/etc/login.defs\fR.
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+from \fB/etc/login.defs\fR by taking \fBHOME_MODE\fR and \fBUMASK\fR values, in
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+this order. First found value persists.
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.SH SEE ALSO
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\fBoddjob.conf\fR(5)
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diff --git a/src/pam_oddjob_mkhomedir.8.in b/src/pam_oddjob_mkhomedir.8.in
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index 3793764..2fb16bc 100644
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--- a/src/pam_oddjob_mkhomedir.8.in
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+++ b/src/pam_oddjob_mkhomedir.8.in
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@@ -14,8 +14,9 @@ if the module is running with superuser privileges. Otherwise, it invokes the
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\fImkmyhomedir\fR method.
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The location of the skeleton directory and the default umask are determined by
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-the configuration for the corresponding service in \fBoddjobd-mkhomedir.conf\fR,
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-so they can not be specified as arguments to this module.
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+the values of \fBHOME_MODE\fR or \fBUMASK\fR (as a fallback) variables in
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+\fI/etc/login.defs\fR, so they can not be specified as arguments to this
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+module.
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If \fID-Bus\fR has not been configured to allow the calling application to
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invoke these methods provided as part of the \fI@NAMESPACE@.oddjob_mkhomedir\fR
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--
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2.28.0
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