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Allow the user to change their password if expired on AIX.

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Bug #883
This commit is contained in:
Todd C. Miller
2019-05-27 06:35:48 -06:00
parent 07ed5b86f2
commit dae484213e
1 changed files with 98 additions and 0 deletions
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98
plugins/sudoers/auth/aix_auth.c
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@@ -30,6 +30,7 @@
#ifdef HAVE_AIXAUTH
#include <sys/types.h>
#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_STRING_H
@@ -40,7 +41,9 @@
#endif /* HAVE_STRING_H */
#include <unistd.h>
#include <ctype.h>
#include <errno.h>
#include <pwd.h>
#include <signal.h>
#include <usersec.h>
#include "sudoers.h"
@@ -169,6 +172,67 @@ sudo_aix_valid_message(const char *message)
debug_return_bool(true);
}
/*
* Change the user's password. If root changes the user's password
* the ADMCHG flag is set on the account (and the user must change
* it again) so we run passwd(1) as the user. This does mean that
* the user will need to re-enter their original password again,
* unlike with su(1). We may consider using pwdadm(1) as root to
* change the password and then clear the flag in the future.
*/
static bool
sudo_aix_change_password(const char *user)
{
struct sigaction sa, savechld;
pid_t child, pid;
bool ret = false;
sigset_t mask;
int status;
debug_decl(sudo_aix_change_password, SUDOERS_DEBUG_AUTH)
/* Set SIGCHLD handler to default since we call waitpid() below. */
memset(&sa, 0, sizeof(sa));
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
sa.sa_handler = SIG_DFL;
(void) sigaction(SIGCHLD, &sa, &savechld);
switch (child = sudo_debug_fork()) {
case -1:
/* error */
sudo_warn(U_("unable to fork"));
break;
case 0:
/* child, run passwd(1) */
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGQUIT);
(void) sigprocmask(SIG_UNBLOCK, &mask, NULL);
set_perms(PERM_USER);
execl("/usr/bin/passwd", "passwd", user, (char *)NULL);
sudo_warn("passwd");
_exit(127);
/* NOTREACHED */
default:
/* parent */
break;
}
/* Wait for passwd(1) to complete. */
do {
pid = waitpid(child, &status, 0);
} while (pid == -1 && errno == EINTR);
sudo_debug_printf(SUDO_DEBUG_INFO|SUDO_DEBUG_LINENO,
"child (%d) exit value %d", (int)child, status);
if (pid != -1 && WIFEXITED(status) && WEXITSTATUS(status) == 0)
ret = true;
/* Restore saved SIGCHLD handler. */
(void) sigaction(SIGCHLD, &savechld, NULL);
debug_return_bool(ret);
}
int
sudo_aix_verify(struct passwd *pw, char *prompt, sudo_auth *auth, struct sudo_conv_callback *callback)
{
@@ -196,6 +260,40 @@ sudo_aix_verify(struct passwd *pw, char *prompt, sudo_auth *auth, struct sudo_co
ret = pass ? AUTH_FAILURE : AUTH_INTR;
}
free(message);
message = NULL;
/* Check if password expired and allow user to change it if possible. */
if (ret == AUTH_SUCCESS) {
result = passwdexpired(pw->pw_name, &message);
if (message != NULL && message[0] != '\0') {
sudo_printf(result ? SUDO_CONV_ERROR_MSG : SUDO_CONV_INFO_MSG,
"%s", message);
free(message);
message = NULL;
}
switch (result) {
case 0:
/* password not expired. */
break;
case 1:
/* password expired, user must change it */
if (!sudo_aix_change_password(pw->pw_name)) {
sudo_warnx(U_("unable to change password for %s"), pw->pw_name);
ret = AUTH_FATAL;
}
break;
case 2:
/* password expired, only admin can change it */
ret = AUTH_FATAL;
break;
default:
/* error (-1) */
sudo_warn("passwdexpired");
ret = AUTH_FATAL;
break;
}
}
debug_return_int(ret);
}