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* src/su.c: Split check_perms() in to a PAM (check_perms_pam) and

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a non-PAM (check_perms_nopam) version.
This commit is contained in:
nekral-guest 2011-06-13 18:26:58 +00:00
parent 40a16a1b04
commit 927c2f06a3
2 changed files with 75 additions and 62 deletions
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2
ChangeLog
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@ -2,6 +2,8 @@
* src/su.c (save_caller_context): Extract from main() the code
used to save the caller's context.
* src/su.c: Split check_perms() in to a PAM (check_perms_pam) and
a non-PAM (check_perms_nopam) version.
2011-06-10 Nicolas François <nicolas.francois@centraliens.net>

135
src/su.c
View File

@ -120,6 +120,11 @@ static RETSIGTYPE die (int);
static bool iswheel (const char *);
#endif /* !USE_PAM */
static struct passwd * check_perms (void);
#ifdef USE_PAM
static void check_perms_pam (struct passwd *pw)
#else /* !USE_PAM */
static void check_perms_nopam (struct passwd *pw);
#endif /* !USE_PAM */
static void save_caller_context (char **argv);
#ifndef USE_PAM
@ -413,34 +418,55 @@ static void usage (int status)
exit (status);
}
/*
* check_perms - check permissions to switch to the user 'name'
*
* In case of subsystem login, the user is first authenticated in the
* caller's root subsystem, and then in the user's target subsystem.
*/
static struct passwd * check_perms (void)
{
#ifdef USE_PAM
static void check_perms_pam (struct passwd *pw)
{
int ret;
ret = pam_authenticate (pamh, 0);
if (PAM_SUCCESS != ret) {
SYSLOG ((LOG_ERR, "pam_authenticate: %s",
pam_strerror (pamh, ret)));
fprintf (stderr, _("%s: %s\n"), Prog, pam_strerror (pamh, ret));
(void) pam_end (pamh, ret);
su_failure (caller_tty, 0 == pw->pw_uid);
}
ret = pam_acct_mgmt (pamh, 0);
if (PAM_SUCCESS != ret) {
if (caller_is_root) {
fprintf (stderr,
_("%s: %s\n(Ignored)\n"),
Prog, pam_strerror (pamh, ret));
} else if (PAM_NEW_AUTHTOK_REQD == ret) {
ret = pam_chauthtok (pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
if (PAM_SUCCESS != ret) {
SYSLOG ((LOG_ERR, "pam_chauthtok: %s",
pam_strerror (pamh, ret)));
fprintf (stderr,
_("%s: %s\n"),
Prog, pam_strerror (pamh, ret));
(void) pam_end (pamh, ret);
su_failure (caller_tty, 0 == pw->pw_uid);
}
} else {
SYSLOG ((LOG_ERR, "pam_acct_mgmt: %s",
pam_strerror (pamh, ret)));
fprintf (stderr,
_("%s: %s\n"),
Prog, pam_strerror (pamh, ret));
(void) pam_end (pamh, ret);
su_failure (caller_tty, 0 == pw->pw_uid);
}
}
}
#else /* !USE_PAM */
static void check_perms_nopam (struct passwd *pw)
{
#ifdef SU_ACCESS
struct spwd *spwd = NULL;
#endif /* SU_ACCESS */
RETSIGTYPE (*oldsig) (int);
#endif /* !USE_PAM */
/*
* The password file entries for the user is gotten and the account
* validated.
*/
struct passwd *pw = xgetpwnam (name);
if (NULL == pw) {
(void) fprintf (stderr, _("Unknown id: %s\n"), name);
closelog ();
exit (1);
}
#ifndef USE_PAM
/*
* BSD systems only allow "wheel" to SU to root. USG systems don't,
* so we make this a configurable option.
@ -494,48 +520,6 @@ static struct passwd * check_perms (void)
}
#endif /* SU_ACCESS */
}
#endif /* !USE_PAM */
(void) signal (SIGINT, SIG_IGN);
(void) signal (SIGQUIT, SIG_IGN);
#ifdef USE_PAM
ret = pam_authenticate (pamh, 0);
if (PAM_SUCCESS != ret) {
SYSLOG ((LOG_ERR, "pam_authenticate: %s",
pam_strerror (pamh, ret)));
fprintf (stderr, _("%s: %s\n"), Prog, pam_strerror (pamh, ret));
(void) pam_end (pamh, ret);
su_failure (caller_tty, 0 == pw->pw_uid);
}
ret = pam_acct_mgmt (pamh, 0);
if (PAM_SUCCESS != ret) {
if (caller_is_root) {
fprintf (stderr,
_("%s: %s\n(Ignored)\n"),
Prog, pam_strerror (pamh, ret));
} else if (PAM_NEW_AUTHTOK_REQD == ret) {
ret = pam_chauthtok (pamh, PAM_CHANGE_EXPIRED_AUTHTOK);
if (PAM_SUCCESS != ret) {
SYSLOG ((LOG_ERR, "pam_chauthtok: %s",
pam_strerror (pamh, ret)));
fprintf (stderr,
_("%s: %s\n"),
Prog, pam_strerror (pamh, ret));
(void) pam_end (pamh, ret);
su_failure (caller_tty, 0 == pw->pw_uid);
}
} else {
SYSLOG ((LOG_ERR, "pam_acct_mgmt: %s",
pam_strerror (pamh, ret)));
fprintf (stderr,
_("%s: %s\n"),
Prog, pam_strerror (pamh, ret));
(void) pam_end (pamh, ret);
su_failure (caller_tty, 0 == pw->pw_uid);
}
}
#else /* !USE_PAM */
/*
* Set up a signal handler in case the user types QUIT.
*/
@ -582,8 +566,35 @@ static struct passwd * check_perms (void)
su_failure (caller_tty, 0 == pw->pw_uid);
}
}
}
#endif /* !USE_PAM */
/*
* check_perms - check permissions to switch to the user 'name'
*
* In case of subsystem login, the user is first authenticated in the
* caller's root subsystem, and then in the user's target subsystem.
*/
static struct passwd * check_perms (void)
{
/*
* The password file entries for the user is gotten and the account
* validated.
*/
struct passwd *pw = xgetpwnam (name);
if (NULL == pw) {
(void) fprintf (stderr, _("Unknown id: %s\n"), name);
closelog ();
exit (1);
}
(void) signal (SIGINT, SIG_IGN);
(void) signal (SIGQUIT, SIG_IGN);
#ifdef USE_PAM
check_perms_pam (pw);
#else /* !USE_PAM */
check_perms_pam (pw);
#endif /* !USE_PAM */
(void) signal (SIGINT, SIG_DFL);
(void) signal (SIGQUIT, SIG_DFL);