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login.defs: Add LASTLOG_UID_MAX variable to limit lastlog to small uids.

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As the large uids are usually provided by remote user identity and
authentication service, which also provide user login tracking,
there is no need to create a huge sparse file for them on every local
machine.

fixup! login.defs: Add LASTLOG_UID_MAX variable to limit lastlog to small uids.
This commit is contained in:
Tomas Mraz
2018-11-28 14:57:16 +01:00
committed by Serge Hallyn
parent 59c2dabb26
commit 4633164857
11 changed files with 115 additions and 3 deletions
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7
src/usermod.c
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@ -1864,11 +1864,18 @@ static void update_lastlog (void)
int fd;
off_t off_uid = (off_t) user_id * sizeof ll;
off_t off_newuid = (off_t) user_newid * sizeof ll;
uid_t max_uid;
if (access (LASTLOG_FILE, F_OK) != 0) {
return;
}
max_uid = (uid_t) getdef_ulong ("LASTLOG_MAX_UID", 0xFFFFFFFFUL);
if (user_newid > max_uid) {
/* do not touch lastlog for large uids */
return;
}
fd = open (LASTLOG_FILE, O_RDWR);
if (-1 == fd) {