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homed: don't block logins into accounts with future change time

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This might happen if the system clock is wrong, and we should allow
access in this case (though certainly log about it).
This commit is contained in:
Lennart Poettering 2020-09-02 16:35:22 +02:00
parent 55e11ace68
commit 51a95db6dc
3 changed files with 14 additions and 12 deletions
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4
src/home/pam_systemd_home.c
View File

@ -846,8 +846,8 @@ _public_ PAM_EXTERN int pam_sm_acct_mgmt(
switch (r) {
case -ESTALE:
(void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record is newer than current system time, prohibiting access.");
return PAM_ACCT_EXPIRED;
pam_syslog(handle, LOG_WARNING, "User record for '%s' is newer than current system time, assuming incorrect system clock, allowing access.", ur->user_name);
break;
case -ENOLCK:
(void) pam_prompt(handle, PAM_ERROR_MSG, NULL, "User record is blocked, prohibiting access.");

11
src/shared/user-record-show.c
View File

@ -45,6 +45,10 @@ void user_record_show(UserRecord *hr, bool show_full_group_info) {
if (hr->last_change_usec != USEC_INFINITY) {
char buf[FORMAT_TIMESTAMP_MAX];
printf(" Last Change: %s\n", format_timestamp(buf, sizeof(buf), hr->last_change_usec));
if (hr->last_change_usec > now(CLOCK_REALTIME))
printf(" %sModification time lies in the future, system clock wrong?%s\n",
ansi_highlight_yellow(), ansi_normal());
}
if (hr->last_password_change_usec != USEC_INFINITY &&
@ -56,10 +60,6 @@ void user_record_show(UserRecord *hr, bool show_full_group_info) {
r = user_record_test_blocked(hr);
switch (r) {
case -ESTALE:
printf(" Login OK: %sno%s (last change time is in the future)\n", ansi_highlight_red(), ansi_normal());
break;
case -ENOLCK:
printf(" Login OK: %sno%s (record is locked)\n", ansi_highlight_red(), ansi_normal());
break;
@ -72,10 +72,11 @@ void user_record_show(UserRecord *hr, bool show_full_group_info) {
printf(" Login OK: %sno%s (record not valid anymore))\n", ansi_highlight_red(), ansi_normal());
break;
case -ESTALE:
default: {
usec_t y;
if (r < 0) {
if (r < 0 && r != -ESTALE) {
errno = -r;
printf(" Login OK: %sno%s (%m)\n", ansi_highlight_red(), ansi_normal());
break;

11
src/shared/user-record.c
View File

@ -2025,19 +2025,20 @@ int user_record_test_blocked(UserRecord *h) {
assert(h);
n = now(CLOCK_REALTIME);
if (h->last_change_usec != UINT64_MAX &&
h->last_change_usec > n) /* Don't allow log ins when the record is from the future */
return -ESTALE;
if (h->locked > 0)
return -ENOLCK;
n = now(CLOCK_REALTIME);
if (h->not_before_usec != UINT64_MAX && n < h->not_before_usec)
return -EL2HLT;
if (h->not_after_usec != UINT64_MAX && n > h->not_after_usec)
return -EL3HLT;
if (h->last_change_usec != UINT64_MAX &&
h->last_change_usec > n) /* Complain during log-ins when the record is from the future */
return -ESTALE;
return 0;
}