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cron(8): set the environment variables of the user and/or login class

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Prior to processing environment variable set in the crontab file as those
should be of higher precedent, pull in the user or login class environment.

This is another supporting feature for allowing one to configure system-wide
settings that may affect both regular cron jobs as well as services.

This is the final part of D21481.

Submitted by:	Andrew Gierth <andrew_tao173.riddles.org.uk>
This commit is contained in:
Kyle Evans 2020-02-05 04:35:54 +00:00
parent 736a5a6d1d
commit 7466dbd684
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=357565
2 changed files with 31 additions and 8 deletions
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27
usr.sbin/cron/cron/do_command.c
View file

@ -43,6 +43,8 @@ static void child_process(entry *, user *),
static WAIT_T wait_on_child(PID_T, const char *);
extern char *environ;
void
do_command(e, u)
entry *e;
@ -285,9 +287,11 @@ child_process(e, u)
*/
do_univ(u);
environ = NULL;
# if defined(LOGIN_CAP)
/* Set user's entire context, but skip the environment
* as cron provides a separate interface for this
/* Set user's entire context, but note that PATH will
* be overridden later
*/
if ((pwd = getpwnam(usernm)) == NULL)
pwd = getpwuid(e->uid);
@ -299,7 +303,7 @@ child_process(e, u)
}
if (pwd &&
setusercontext(lc, pwd, e->uid,
LOGIN_SETALL & ~(LOGIN_SETPATH|LOGIN_SETENV)) == 0)
LOGIN_SETALL) == 0)
(void) endpwent();
else {
/* fall back to the old method */
@ -342,6 +346,18 @@ child_process(e, u)
*/
{
char *shell = env_get("SHELL", e->envp);
char **p;
/* Apply the environment from the entry, overriding existing
* values (this will always set PATH, LOGNAME, etc.) putenv
* should not fail unless malloc does.
*/
for (p = e->envp; *p; ++p) {
if (putenv(*p) != 0) {
warn("putenv");
_exit(ERROR_EXIT);
}
}
# if DEBUGGING
if (DebugFlags & DTEST) {
@ -352,9 +368,8 @@ child_process(e, u)
_exit(OK_EXIT);
}
# endif /*DEBUGGING*/
execle(shell, shell, "-c", e->cmd, (char *)NULL,
e->envp);
warn("execle: couldn't exec `%s'", shell);
execl(shell, shell, "-c", e->cmd, (char *)NULL);
warn("execl: couldn't exec `%s'", shell);
_exit(ERROR_EXIT);
}
break;

12
usr.sbin/cron/crontab/crontab.5
View file

@ -17,7 +17,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd September 24, 2019
.Dd January 19, 2020
.Dt CRONTAB 5
.Os
.Sh NAME
@ -82,10 +82,18 @@ and
are set from the
.Pa /etc/passwd
line of the crontab's owner.
In addition, the environment variables of the
user's login class, with the exception of
.Ev PATH ,
will be set from
.Pa /etc/login.conf.db
and
.Pa ~/.login_conf .
.Ev HOME ,
.Ev PATH
and
.Ev SHELL
.Ev SHELL ,
and any variables set from the login class,
may be overridden by settings in the crontab;
.Ev LOGNAME
may not.