229 lines
5.3 KiB
C
229 lines
5.3 KiB
C
/*
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* Copyright (C) 2012 Martin Willi
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* Copyright (C) 2012 revosec AG
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*/
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#include "xauth_pam.h"
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#include <daemon.h>
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#include <library.h>
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#include <security/pam_appl.h>
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typedef struct private_xauth_pam_t private_xauth_pam_t;
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/**
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* Private data of an xauth_pam_t object.
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*/
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struct private_xauth_pam_t {
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/**
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* Public interface.
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*/
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xauth_pam_t public;
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/**
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* ID of the peer
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*/
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identification_t *peer;
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};
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METHOD(xauth_method_t, initiate, status_t,
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private_xauth_pam_t *this, cp_payload_t **out)
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{
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cp_payload_t *cp;
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cp = cp_payload_create_type(PLV1_CONFIGURATION, CFG_REQUEST);
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cp->add_attribute(cp, configuration_attribute_create_chunk(
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PLV1_CONFIGURATION_ATTRIBUTE, XAUTH_USER_NAME, chunk_empty));
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cp->add_attribute(cp, configuration_attribute_create_chunk(
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PLV1_CONFIGURATION_ATTRIBUTE, XAUTH_USER_PASSWORD, chunk_empty));
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*out = cp;
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return NEED_MORE;
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}
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/**
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* PAM conv callback function
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*/
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static int auth_conv(int num_msg, const struct pam_message **msg,
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struct pam_response **resp, char *password)
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{
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struct pam_response *response;
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if (num_msg != 1)
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{
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return PAM_CONV_ERR;
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}
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response = malloc(sizeof(struct pam_response));
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response->resp = strdup(password);
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response->resp_retcode = 0;
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*resp = response;
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return PAM_SUCCESS;
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}
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/**
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* Authenticate a username/password using PAM
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*/
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static bool authenticate(char *service, char *user, char *password)
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{
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pam_handle_t *pamh = NULL;
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static struct pam_conv conv;
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int ret;
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conv.conv = (void*)auth_conv;
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conv.appdata_ptr = password;
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ret = pam_start(service, user, &conv, &pamh);
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if (ret != PAM_SUCCESS)
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{
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DBG1(DBG_IKE, "XAuth pam_start for '%s' failed: %s",
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user, pam_strerror(pamh, ret));
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return FALSE;
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}
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ret = pam_authenticate(pamh, 0);
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if (ret == PAM_SUCCESS)
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{
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ret = pam_acct_mgmt(pamh, 0);
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if (ret != PAM_SUCCESS)
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{
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DBG1(DBG_IKE, "XAuth pam_acct_mgmt for '%s' failed: %s",
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user, pam_strerror(pamh, ret));
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}
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}
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else
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{
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DBG1(DBG_IKE, "XAuth pam_authenticate for '%s' failed: %s",
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user, pam_strerror(pamh, ret));
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}
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pam_end(pamh, ret);
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return ret == PAM_SUCCESS;
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}
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/**
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* Convert configuration attribute content to a null-terminated string
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*/
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static void attr2string(char *buf, size_t len, chunk_t chunk)
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{
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if (chunk.len && chunk.len < len)
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{
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chunk_t sane;
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chunk_printable(chunk, &sane, '?');
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snprintf(buf, len, "%.*s", (int)sane.len, sane.ptr);
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chunk_clear(&sane);
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}
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}
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METHOD(xauth_method_t, process, status_t,
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private_xauth_pam_t *this, cp_payload_t *in, cp_payload_t **out)
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{
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char *service, user[128] = "", pass[128] = "", *pos;
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configuration_attribute_t *attr;
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enumerator_t *enumerator;
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chunk_t chunk;
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enumerator = in->create_attribute_enumerator(in);
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while (enumerator->enumerate(enumerator, &attr))
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{
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switch (attr->get_type(attr))
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{
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case XAUTH_USER_NAME:
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chunk = attr->get_chunk(attr);
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/* trim to username part if email address given */
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if (lib->settings->get_bool(lib->settings,
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"%s.plugins.xauth-pam.trim_email",
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TRUE, lib->ns))
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{
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pos = memchr(chunk.ptr, '@', chunk.len);
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if (pos)
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{
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chunk.len = (u_char*)pos - chunk.ptr;
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}
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}
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attr2string(user, sizeof(user), chunk);
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break;
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case XAUTH_USER_PASSWORD:
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chunk = attr->get_chunk(attr);
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if (chunk.len && chunk.ptr[chunk.len - 1] == 0)
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{ /* fix null-terminated passwords (Android etc.) */
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chunk.len -= 1;
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}
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attr2string(pass, sizeof(pass), chunk);
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break;
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default:
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break;
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}
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}
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enumerator->destroy(enumerator);
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if (!user[0] || !pass[0])
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{
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DBG1(DBG_IKE, "peer did not respond to our XAuth request");
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return FAILED;
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}
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this->peer->destroy(this->peer);
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this->peer = identification_create_from_string(user);
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/* Look for PAM service, with a legacy fallback for the eap-gtc plugin.
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* Default to "login". */
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service = lib->settings->get_str(lib->settings,
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"%s.plugins.xauth-pam.pam_service",
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lib->settings->get_str(lib->settings,
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"%s.plugins.eap-gtc.pam_service", "login", lib->ns),
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lib->ns);
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if (authenticate(service, user, pass))
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{
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DBG1(DBG_IKE, "PAM authentication of '%s' successful", user);
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return SUCCESS;
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}
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return FAILED;
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}
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METHOD(xauth_method_t, get_identity, identification_t*,
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private_xauth_pam_t *this)
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{
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return this->peer;
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}
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METHOD(xauth_method_t, destroy, void,
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private_xauth_pam_t *this)
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{
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this->peer->destroy(this->peer);
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free(this);
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}
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/*
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* Described in header.
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*/
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xauth_pam_t *xauth_pam_create_server(identification_t *server,
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identification_t *peer, char *profile)
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{
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private_xauth_pam_t *this;
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INIT(this,
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.public = {
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.xauth_method = {
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.initiate = _initiate,
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.process = _process,
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.get_identity = _get_identity,
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.destroy = _destroy,
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},
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},
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.peer = peer->clone(peer),
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);
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return &this->public;
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}
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