int
main(int argc, char **argv)
{
char hostname[MAXHOSTNAMELEN];
struct passwd *pwd = NULL;
int o, pam_err;
uid_t uid;
while ((o = getopt(argc, argv, "d:h:loy")) != -1)
switch (o) {
case 'd':
yp_domain = optarg;
break;
case 'h':
yp_host = optarg;
break;
case 'l':
case 'o':
case 'y':
/* compatibility */
break;
default:
usage();
}
argc -= optind;
argv += optind;
uid = getuid();
switch (argc) {
case 0:
if ((pwd = getpwuid(uid)) == NULL)
errx(1, "who are you?");
break;
case 1:
if ((pwd = getpwnam(*argv)) == NULL)
errx(1, "%s: no such user", *argv);
break;
default:
usage();
}
if (uid != 0 && uid != pwd->pw_uid)
errx(1, "permission denied");
/* check where the user's from */
switch (pwd->pw_fields & _PWF_SOURCE) {
case _PWF_FILES:
fprintf(stderr, "Changing local password for %s\n",
pwd->pw_name);
break;
case _PWF_NIS:
fprintf(stderr, "Changing NIS password for %s\n",
pwd->pw_name);
break;
default:
fprintf(stderr, "Changing password for %s\n",
pwd->pw_name);
}
#define pam_check(func) do { \
if (pam_err != PAM_SUCCESS) { \
if (pam_err == PAM_AUTH_ERR || pam_err == PAM_PERM_DENIED || \
pam_err == PAM_AUTHTOK_RECOVERY_ERR) \
warnx("sorry"); \
else \
warnx("%s(): %s", func, pam_strerror(pamh, pam_err)); \
goto end; \
} \
} while (0)
/* initialize PAM */
pam_err = pam_start("passwd", pwd->pw_name, &pamc, &pamh);
pam_check("pam_start");
pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO));
pam_check("pam_set_item");
gethostname(hostname, sizeof hostname);
pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
pam_check("pam_set_item");
pam_err = pam_set_item(pamh, PAM_RUSER, getlogin());
pam_check("pam_set_item");
/* set YP domain and host */
pam_err = pam_set_data(pamh, "yp_domain", yp_domain, NULL);
pam_check("pam_set_data");
pam_err = pam_set_data(pamh, "yp_server", yp_host, NULL);
pam_check("pam_set_data");
/* set new password */
pam_err = pam_chauthtok(pamh, 0);
pam_check("pam_chauthtok");
end:
pam_end(pamh, pam_err);
exit(pam_err == PAM_SUCCESS ? 0 : 1);
}
void
pwpam_process(const char *username, int argc, char **argv)
{
int ch, pam_err;
char hostname[MAXHOSTNAMELEN + 1];
/* details about the invoking user for logging */
const uid_t i_uid = getuid();
const struct passwd *const i_pwd = getpwuid(i_uid);
const char *const i_username = (i_pwd && i_pwd->pw_name)
? i_pwd->pw_name : "(null)";
while ((ch = getopt(argc, argv, "")) != -1) {
switch (ch) {
default:
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
switch (argc) {
case 0:
/* username already provided */
break;
case 1:
username = argv[0];
break;
default:
usage();
/* NOTREACHED */
}
(void)printf("Changing password for %s.\n", username);
/* initialize PAM -- always use the program name "passwd" */
pam_err = pam_start("passwd", username, &pamc, &pamh);
if (pam_err != PAM_SUCCESS)
errx(1, "unable to start PAM session: %s",
pam_strerror(NULL, pam_err));
pam_err = pam_set_item(pamh, PAM_TTY, ttyname(STDERR_FILENO));
pam_check("unable to set TTY");
(void)gethostname(hostname, sizeof hostname);
pam_err = pam_set_item(pamh, PAM_RHOST, hostname);
pam_check("unable to set RHOST");
pam_err = pam_set_item(pamh, PAM_RUSER, getlogin());
pam_check("unable to set RUSER");
/* set new password */
pam_err = pam_chauthtok(pamh, 0);
if (pam_err != PAM_SUCCESS) {
if (pam_err == PAM_PERM_DENIED) {
syslog(LOG_AUTH | LOG_NOTICE,
"user %s (UID %lu) failed to change the "
"PAM authentication token of user %s: %s",
i_username, (unsigned long)i_uid, username,
pam_strerror(pamh, pam_err));
}
printf("Unable to change auth token: %s\n",
pam_strerror(pamh, pam_err));
} else {
syslog(LOG_AUTH | LOG_INFO,
"user %s (UID %lu) successfully changed the "
"PAM authentication token of user %s",
i_username, (unsigned long)i_uid, username);
}
end:
pam_end(pamh, pam_err);
if (pam_err == PAM_SUCCESS)
return;
exit(1);
}