int
duo_check_groups(struct passwd *pw, char **groups, int groups_cnt)
{
int i;
if (groups_cnt > 0) {
int matched = 0;
if (ga_init(pw->pw_name, pw->pw_gid) < 0) {
duo_log(LOG_ERR, "Couldn't get groups",
pw->pw_name, NULL, strerror(errno));
return (-1);
}
for (i = 0; i < groups_cnt; i++) {
if (ga_match_pattern_list(groups[i])) {
matched = 1;
break;
}
}
ga_free();
/* User in configured groups for Duo auth? */
return matched;
} else {
return 1;
}
}
static int
match_cfg_line_group(const char *grps, int line, const char *user)
{
int result = 0;
struct passwd *pw;
if (user == NULL)
goto out;
if ((pw = getpwnam(user)) == NULL) {
debug("Can't match group at line %d because user %.100s does "
"not exist", line, user);
} else if (ga_init(pw->pw_name, pw->pw_gid) == 0) {
debug("Can't Match group because user %.100s not in any group "
"at line %d", user, line);
} else if (ga_match_pattern_list(grps) != 1) {
debug("user %.100s does not match group list %.100s at line %d",
user, grps, line);
} else {
debug("user %.100s matched group list %.100s at line %d", user,
grps, line);
result = 1;
}
out:
ga_free();
return result;
}
PAM_EXTERN int
pam_sm_authenticate(pam_handle_t *pamh, int pam_flags,
int argc, const char *argv[])
{
struct duo_config cfg;
struct passwd *pw;
duo_t *duo;
duo_code_t code;
duopam_const char *config, *cmd, *ip, *p, *service, *user;
int i, flags, pam_err;
memset(&cfg, 0, sizeof(cfg));
cfg.failmode = DUO_FAIL_SAFE;
/* Parse configuration */
config = DUO_CONF;
for (i = 0; i < argc; i++) {
if (strncmp("conf=", argv[i], 5) == 0) {
config = argv[i] + 5;
} else if (strcmp("debug", argv[i]) == 0) {
options |= PAM_OPT_DEBUG;
} else if (strcmp("try_first_pass", argv[i]) == 0) {
options |= PAM_OPT_TRY_FIRST_PASS;
} else if (strcmp("use_first_pass", argv[i]) == 0) {
options |= PAM_OPT_USE_FIRST_PASS|PAM_OPT_TRY_FIRST_PASS;
} else if (strcmp("use_uid", argv[i]) == 0) {
options |= PAM_OPT_USE_UID;
} else if (strcmp("push", argv[i]) == 0) {
options |= PAM_OPT_PUSH;
} else {
_syslog(LOG_ERR, "Invalid pam_duo option: '%s'",
argv[i]);
return (PAM_SERVICE_ERR);
}
}
i = duo_parse_config(config, __ini_handler, &cfg);
if (i == -2) {
_syslog(LOG_ERR, "%s must be readable only by user 'root'",
config);
return (PAM_SERVICE_ERR);
} else if (i == -1) {
_syslog(LOG_ERR, "Couldn't open %s: %s",
config, strerror(errno));
return (PAM_SERVICE_ERR);
} else if (i > 0) {
_syslog(LOG_ERR, "Parse error in %s, line %d", config, i);
return (PAM_SERVICE_ERR);
} else if (!cfg.host || !cfg.host[0] ||
!cfg.skey || !cfg.skey[0] || !cfg.ikey || !cfg.ikey[0]) {
_syslog(LOG_ERR, "Missing host, ikey, or skey in %s", config);
return (PAM_SERVICE_ERR);
}
/* Check user */
if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS ||
(pw = getpwnam(user)) == NULL) {
return (PAM_USER_UNKNOWN);
}
/* XXX - Service-specific behavior */
flags = 0;
cmd = NULL;
if (pam_get_item(pamh, PAM_SERVICE, (duopam_const void **)
(duopam_const void *)&service) != PAM_SUCCESS) {
return (PAM_SERVICE_ERR);
}
if (options & PAM_OPT_USE_UID) {
/* Check calling user for Duo auth, just like sudo */
if ((pw = getpwuid(getuid())) == NULL) {
return (PAM_USER_UNKNOWN);
}
user = pw->pw_name;
}
if (strcmp(service, "sshd") == 0) {
/*
* Disable incremental status reporting for sshd :-(
* OpenSSH accumulates PAM_TEXT_INFO from modules to send in
* an SSH_MSG_USERAUTH_BANNER post-auth, not real-time!
*/
flags |= DUO_FLAG_SYNC;
} else if (strcmp(service, "sudo") == 0) {
cmd = getenv("SUDO_COMMAND");
}
/* Check group membership */
if (cfg.groups_cnt > 0) {
int matched = 0;
if (ga_init(pw->pw_name, pw->pw_gid) < 0) {
_log(LOG_ERR, "Couldn't get groups",
pw->pw_name, NULL, strerror(errno));
return (PAM_SERVICE_ERR);
}
for (i = 0; i < cfg.groups_cnt; i++) {
if (ga_match_pattern_list(cfg.groups[i])) {
matched = 1;
break;
}
}
ga_free();
/* User in configured groups for Duo auth? */
if (!matched)
return (PAM_SUCCESS);
}
ip = NULL;
pam_get_item(pamh, PAM_RHOST,
(duopam_const void **)(duopam_const void *)&ip);
/* Honor configured http_proxy */
if (cfg.http_proxy != NULL) {
setenv("http_proxy", cfg.http_proxy, 1);
}
/* Try Duo auth */
if ((duo = duo_open(cfg.host, cfg.ikey, cfg.skey,
"pam_duo/" PACKAGE_VERSION,
cfg.noverify ? "" : cfg.cafile)) == NULL) {
_log(LOG_ERR, "Couldn't open Duo API handle", user, ip, NULL);
return (PAM_SERVICE_ERR);
}
duo_set_conv_funcs(duo, __duo_prompt, __duo_status, pamh);
pam_err = PAM_SERVICE_ERR;
for (i = 0; i < MAX_RETRIES; i++) {
code = duo_login(duo, user, ip, flags,
cfg.pushinfo ? cmd : NULL);
if (code == DUO_FAIL) {
_log(LOG_WARNING, "Failed Duo login",
user, ip, duo_geterr(duo));
if ((flags & DUO_FLAG_SYNC) == 0) {
pam_info(pamh, "%s", "");
}
/* Keep going */
continue;
}
/* Terminal conditions */
if (code == DUO_OK) {
if ((p = duo_geterr(duo)) != NULL) {
_log(LOG_WARNING, "Skipped Duo login",
user, ip, p);
} else {
_log(LOG_INFO, "Successful Duo login",
user, ip, NULL);
}
pam_err = PAM_SUCCESS;
} else if (code == DUO_ABORT) {
_log(LOG_WARNING, "Aborted Duo login",
user, ip, duo_geterr(duo));
pam_err = PAM_ABORT;
} else if (cfg.failmode == DUO_FAIL_SAFE &&
(code == DUO_CONN_ERROR ||
code == DUO_CLIENT_ERROR || code == DUO_SERVER_ERROR)) {
_log(LOG_WARNING, "Failsafe Duo login",
user, ip, duo_geterr(duo));
pam_err = PAM_SUCCESS;
} else {
_log(LOG_ERR, "Error in Duo login",
user, ip, duo_geterr(duo));
pam_err = PAM_SERVICE_ERR;
}
break;
}
if (i == MAX_RETRIES) {
pam_err = PAM_MAXTRIES;
}
duo_close(duo);
return (pam_err);
}
